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elfutils
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main
src/readelf.c
14 294 строки
395 KB
Kane Wang
readelf: Cap stack allocation for bit-array core notes
13 июл 2026, 15:40
13 июл 2026, 15:40
22437a8
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/* Print information from ELF file in human-readable form. Copyright (C) 1999-2018 Red Hat, Inc. Copyright (C) 2023, 2025, 2026 Mark J. Wielaard <mark@klomp.org> This file is part of elfutils. This file is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. elfutils is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <argp.h> #include <assert.h> #include <ctype.h> #include <dwarf.h> #include <errno.h> #include <fcntl.h> #include <gelf.h> #include <inttypes.h> #include <langinfo.h> #include <libdw.h> #include <libdwfl.h> #include <locale.h> #include <stdarg.h> #include <stdbool.h> #include <stdio.h> #include <stdio_ext.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <time.h> #include <unistd.h> #include <sys/stat.h> #include <signal.h> #include <libeu.h> #include <system.h> #include <printversion.h> #include "../libelf/libelfP.h" #include "../libelf/common.h" #include "../libebl/libeblP.h" #include "../libdwelf/libdwelf.h" #include "../libdw/libdwP.h" #include "../libdwfl/libdwflP.h" #include "../libdw/memory-access.h" #include "../libdw/known-dwarf.h" #ifdef USE_LOCKS #include "threadlib.h" #endif #ifdef HAVE_SCHED_H #include <sched.h> #endif #ifdef HAVE_SYS_RESOURCE_H #include <sys/resource.h> #endif #ifdef __linux__ #define CORE_SIGILL SIGILL #define CORE_SIGBUS SIGBUS #define CORE_SIGFPE SIGFPE #define CORE_SIGSEGV SIGSEGV #define CORE_SI_USER SI_USER #else /* We want the linux version of those as that is what shows up in the core files. */ #define CORE_SIGILL 4 /* Illegal instruction (ANSI). */ #define CORE_SIGBUS 7 /* BUS error (4.2 BSD). */ #define CORE_SIGFPE 8 /* Floating-point exception (ANSI). */ #define CORE_SIGSEGV 11 /* Segmentation violation (ANSI). */ #define CORE_SI_USER 0 /* Sent by kill, sigsend. */ #endif /* Name and version of program. */ ARGP_PROGRAM_VERSION_HOOK_DEF = print_version; /* Bug report address. */ ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT; /* argp key value for --elf-section, non-ascii. */ #define ELF_INPUT_SECTION 256 /* argp key value for --dwarf-skeleton, non-ascii. */ #define DWARF_SKELETON 257 /* argp key value for --dyn-syms, non-ascii. */ #define PRINT_DYNSYM_TABLE 258 /* Terrible hack for hooking unrelated skeleton/split compile units, see __libdw_link_skel_split in print_debug. */ static bool do_not_close_dwfl = false; /* Definitions of arguments for argp functions. */ static const struct argp_option options[] = { { NULL, 0, NULL, 0, N_("ELF input selection:"), 0 }, { "elf-section", ELF_INPUT_SECTION, "SECTION", OPTION_ARG_OPTIONAL, N_("Use the named SECTION (default .gnu_debugdata) as (compressed) ELF " "input data"), 0 }, { "dwarf-skeleton", DWARF_SKELETON, "FILE", 0, N_("Used with -w to find the skeleton Compile Units in FILE associated " "with the Split Compile units in a .dwo input file"), 0 }, { NULL, 0, NULL, 0, N_("ELF output selection:"), 0 }, { "all", 'a', NULL, 0, N_("All these plus -p .strtab -p .dynstr -p .comment"), 0 }, { "dynamic", 'd', NULL, 0, N_("Display the dynamic segment"), 0 }, { "file-header", 'h', NULL, 0, N_("Display the ELF file header"), 0 }, { "histogram", 'I', NULL, 0, N_("Display histogram of bucket list lengths"), 0 }, { "program-headers", 'l', NULL, 0, N_("Display the program headers"), 0 }, { "segments", 'l', NULL, OPTION_ALIAS | OPTION_HIDDEN, NULL, 0 }, { "relocs", 'r', NULL, 0, N_("Display relocations"), 0 }, { "section-groups", 'g', NULL, 0, N_("Display the section groups"), 0 }, { "section-headers", 'S', NULL, 0, N_("Display the sections' headers"), 0 }, { "sections", 'S', NULL, OPTION_ALIAS | OPTION_HIDDEN, NULL, 0 }, { "symbols", 's', "SECTION", OPTION_ARG_OPTIONAL, N_("Display the symbol table sections"), 0 }, { "syms", 's', NULL, OPTION_ALIAS | OPTION_HIDDEN, NULL, 0 }, { "dyn-syms", PRINT_DYNSYM_TABLE, NULL, 0, N_("Display (only) the dynamic symbol table"), 0 }, { "version-info", 'V', NULL, 0, N_("Display versioning information"), 0 }, { "notes", 'n', "SECTION", OPTION_ARG_OPTIONAL, N_("Display the ELF notes"), 0 }, { "arch-specific", 'A', NULL, 0, N_("Display architecture specific information, if any"), 0 }, { "exception", 'e', NULL, 0, N_("Display sections for exception handling"), 0 }, { NULL, 0, NULL, 0, N_("Additional output selection:"), 0 }, { "debug-dump", 'w', "SECTION", OPTION_ARG_OPTIONAL, N_("Display DWARF section content. SECTION can be one of abbrev, addr, " "aranges, cu_index, decodedaranges, frame, gdb_index, info, info+, " "loc, line, decodedline, ranges, pubnames, str, macinfo, macro or " "exception"), 0 }, { "hex-dump", 'x', "SECTION", 0, N_("Dump the uninterpreted contents of SECTION, by number or name"), 0 }, { "strings", 'p', "SECTION", OPTION_ARG_OPTIONAL, N_("Print string contents of sections"), 0 }, { "string-dump", 'p', NULL, OPTION_ALIAS | OPTION_HIDDEN, NULL, 0 }, { "archive-index", 'c', NULL, 0, N_("Display the symbol index of an archive"), 0 }, { "use-dynamic", 'D', NULL, 0, N_("Use the dynamic segment when possible for displaying info"), 0 }, { NULL, 0, NULL, 0, N_("Output control:"), 0 }, { "numeric-addresses", 'N', NULL, 0, N_("Do not find symbol names for addresses in DWARF data"), 0 }, { "unresolved-address-offsets", 'U', NULL, 0, N_("Display just offsets instead of resolving values to addresses in DWARF data"), 0 }, { "wide", 'W', NULL, 0, N_("Ignored for compatibility (lines always wide)"), 0 }, { "decompress", 'z', NULL, 0, N_("Show compression information for compressed sections (when used with -S); decompress section before dumping data (when used with -p or -x)"), 0 }, #ifdef USE_LOCKS { "concurrency", 'C', "NUM", 0, N_("Set maximum number of threads. Defaults to the number of CPUs."), 0 }, #endif { NULL, 0, NULL, 0, NULL, 0 } }; /* Short description of program. */ static const char doc[] = N_("\ Print information from ELF file in human-readable form."); /* Strings for arguments in help texts. */ static const char args_doc[] = N_("FILE..."); /* Prototype for option handler. */ static error_t parse_opt (int key, char *arg, struct argp_state *state); /* Data structure to communicate with argp functions. */ static struct argp argp = { options, parse_opt, args_doc, doc, NULL, NULL, NULL }; /* If non-null, the section from which we should read to (compressed) ELF. */ static const char *elf_input_section = NULL; /* If non-null, the file that contains the skeleton CUs. */ static const char *dwarf_skeleton = NULL; /* Flags set by the option controlling the output. */ /* True if dynamic segment should be printed. */ static bool print_dynamic_table; /* True if the file header should be printed. */ static bool print_file_header; /* True if the program headers should be printed. */ static bool print_program_header; /* True if relocations should be printed. */ static bool print_relocations; /* True if the section headers should be printed. */ static bool print_section_header; /* True if the symbol table should be printed. */ static bool print_symbol_table; /* True if (only) the dynsym table should be printed. */ static bool print_dynsym_table; /* True if reconstruct dynamic symbol table from the PT_DYNAMIC segment. */ static bool use_dynamic_segment; /* A specific section name, or NULL to print all symbol tables. */ static char *symbol_table_section; /* A specific section name, or NULL to print all ELF notes. */ static char *notes_section; /* True if the version information should be printed. */ static bool print_version_info; /* True if section groups should be printed. */ static bool print_section_groups; /* True if bucket list length histogram should be printed. */ static bool print_histogram; /* True if the architecture specific data should be printed. */ static bool print_arch; /* True if note section content should be printed. */ static bool print_notes; /* True if SHF_STRINGS section content should be printed. */ static bool print_string_sections; /* True if archive index should be printed. */ static bool print_archive_index; /* True if any of the control options except print_archive_index is set. */ static bool any_control_option; /* True if we should print addresses from DWARF in symbolic form. */ static bool print_address_names = true; /* True if we should print raw values instead of relativized addresses. */ static bool print_unresolved_addresses = false; /* True if we should print the .debug_aranges section using libdw. */ static bool decodedaranges = false; /* True if we should print the .debug_aranges section using libdw. */ static bool decodedline = false; /* True if we want to show more information about compressed sections. */ static bool print_decompress = false; /* True if we want to show split compile units for debug_info skeletons. */ static bool show_split_units = false; #if USE_LOCKS /* Maximum number of threads. */ static int max_threads = 0; #endif /* Select printing of debugging sections. */ static enum section_e { section_abbrev = 1, /* .debug_abbrev */ section_aranges = 2, /* .debug_aranges */ section_frame = 4, /* .debug_frame or .eh_frame & al. */ section_info = 8, /* .debug_info, (implies .debug_types) */ section_line = 16, /* .debug_line */ section_loc = 32, /* .debug_loc */ section_pubnames = 64, /* .debug_pubnames */ section_str = 128, /* .debug_str */ section_macinfo = 256, /* .debug_macinfo */ section_ranges = 512, /* .debug_ranges */ section_exception = 1024, /* .eh_frame & al. */ section_gdb_index = 2048, /* .gdb_index */ section_macro = 4096, /* .debug_macro */ section_addr = 8192, /* .debug_addr */ section_types = 16384, /* .debug_types (implied by .debug_info) */ section_cu_index = 32768, /* .debug_cu_index (include .debug_tu_index) */ section_all = (section_abbrev | section_aranges | section_frame | section_info | section_line | section_loc | section_pubnames | section_str | section_macinfo | section_ranges | section_exception | section_gdb_index | section_macro | section_addr | section_types | section_cu_index) } print_debug_sections, implicit_debug_sections; /* Select hex dumping of sections. */ static struct section_argument *dump_data_sections; static struct section_argument **dump_data_sections_tail = &dump_data_sections; /* Select string dumping of sections. */ static struct section_argument *string_sections; static struct section_argument **string_sections_tail = &string_sections; struct section_argument { struct section_argument *next; const char *arg; bool implicit; }; /* Numbers of sections and program headers in the file. */ static size_t shnum; static size_t phnum; /* Declarations of local functions. */ static void process_file (int fd, const char *fname, bool only_one); static void process_elf_file (Dwfl_Module *dwflmod, int fd); static void print_ehdr (Ebl *ebl, GElf_Ehdr *ehdr); static void print_shdr (Ebl *ebl, GElf_Ehdr *ehdr); static void print_phdr (Ebl *ebl, GElf_Ehdr *ehdr); static void print_scngrp (Ebl *ebl); static void print_dynamic (Ebl *ebl); static void print_relocs (Ebl *ebl, Dwfl_Module *mod, GElf_Ehdr *ehdr); static void handle_relocs_rel (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr); static void handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr); static void handle_relocs_relr (Ebl *ebl, Dwfl_Module *mod, Elf_Scn *scn, GElf_Shdr *shdr); static bool print_symtab (Ebl *ebl, int type); static bool handle_symtab (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr); static bool handle_dynamic_symtab (Ebl *ebl); static void process_symtab( Ebl * ebl, unsigned int nsyms, Elf64_Word idx, Elf32_Word verneed_stridx, Elf32_Word verdef_stridx, Elf_Data * symdata, Elf_Data * versym_data, Elf_Data * symstr_data, Elf_Data * verneed_data, Elf_Data * verdef_data, Elf_Data * xndx_data); static void print_verinfo (Ebl *ebl); static void handle_verneed (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr); static void handle_verdef (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr); static void handle_versym (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr); static void print_debug (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr); static void handle_hash (Ebl *ebl); static void handle_notes (Ebl *ebl, GElf_Ehdr *ehdr); static void print_liblist (Ebl *ebl); static void print_attributes (Ebl *ebl, const GElf_Ehdr *ehdr); static void dump_data (Ebl *ebl); static void dump_strings (Ebl *ebl); static void print_strings (Ebl *ebl); static void dump_archive_index (Elf *, const char *); static void print_dwarf_addr (Dwfl_Module *dwflmod, int address_size, Dwarf_Addr address, Dwarf_Addr raw, FILE *out); static void print_flag_info(void); enum dyn_idx { i_symtab_shndx, i_strsz, i_verneed, i_verneednum, i_verdef, i_verdefnum, i_versym, i_symtab, i_strtab, i_hash, i_gnu_hash, i_max }; /* Declarations of local functions for use-dynamic. */ static Elf_Data *get_dynscn_strtab (Elf *elf, GElf_Phdr *phdr); static void get_dynscn_addrs (Elf *elf, GElf_Phdr *phdr, GElf_Addr addrs[i_max]); static void find_offsets (Elf *elf, GElf_Addr main_bias, size_t n, GElf_Addr addrs[n], GElf_Off offs[n]); /* Looked up once with gettext in main. */ static char *yes_str; static char *no_str; static char *empty_block_str; static char *byte_block_str; static char *offset_str; static char *children_str; static char *tag_str; static char *length_str; static char *dwarf_ver_str; static char *cu_offset_str; static char *seg_size_str; static char *table_offset_lower_str; static char *table_offset_upper_str; static char *addr_size_str; static char *offset_ent_str; static char *cu_str; static char *base_str; static char *type_unit_str; static char *version_str; static char *abbrev_offset_str; static char *addr_size_str; static char *offset_size_str; static char *type_sig_str; static char *type_offset_str; static char *cu_offset_at_str; static char *unit_type_str; static char *unit_id_str; static char *unit_die_off_str; static char *prologue_len_str; static char *seg_selector_str; static char *min_inst_len_str; static char *max_op_per_inst_str; static char *initial_value_if_str; static char *line_base_str; static char *line_range_str; static char *opcodes_base_str; static char *opcodes_str; static char *special_opcode_str; static char *address_str; static char *line_str; static char *ext_opcode_str; static char *set_disc_str; static char *adv_addr_str; static char *to_str; static char *set_file_str; static char *set_col_str; static char *set_str; static char *adv_line_by_str; static char *adv_addr_by_str; static char *unknown_base_str; static char *unknown_base_str; static char *dir_table_str; static char *file_table_str; static char *no_line_num_stmts_str; static char *line_num_stmts_str; static char *end_of_seq_str; static char *set_addr_to_str; static char *copy_str; static void init_gettext_strs (void) { yes_str = _("yes"); no_str = _("no"); empty_block_str = _("empty block"); byte_block_str = _("byte block"); offset_str = _("offset"); children_str = _("children"); tag_str = _("tag"); table_offset_lower_str = _("Table at offset"); table_offset_upper_str = _("Table at Offset"); length_str = _("Length"); dwarf_ver_str = _("DWARF version"); cu_offset_str = _("CU offset"); addr_size_str = _("Address size"); seg_size_str = _("Segment size"); offset_ent_str = _("Offset entries"); cu_str = _("CU"); base_str = _("base"); type_unit_str = _("Type unit at offset"); version_str = _("Version"); abbrev_offset_str = _("Abbreviation section offset"); offset_size_str = _("Offset size"); type_sig_str = _("Type signature"); type_offset_str = _("Type offset"); cu_offset_at_str = _("Compilation unit at offset"); unit_type_str = _("Unit type"); unit_id_str = _("Unit id"); unit_die_off_str = _("Unit DIE off"); prologue_len_str = _("Prologue length"); seg_selector_str = _("Segment selector size"); min_inst_len_str = _("Min instruction length"); max_op_per_inst_str = _("Max operations per instruction"); initial_value_if_str = _("Initial value if"); line_base_str = _("Line base"); line_range_str = _("Line range"); opcodes_base_str = _("Opcode base"); opcodes_str = _("Opcodes"); special_opcode_str = _("special opcode"); address_str = _("address"); line_str = _("line"); ext_opcode_str = _("extended opcode"); set_disc_str = _("set discriminator to"); adv_addr_str = _("advance address by"); to_str = _("to"); set_file_str = _("set file to"); set_col_str = _("set column to"); set_str = _("set"); adv_addr_by_str = _("advance address by constant"); adv_line_by_str = _("advance line by constant"); unknown_base_str = _("Unknown CU base"); dir_table_str = _("Directory table"); file_table_str = _("File name table"); no_line_num_stmts_str = _("No line number statements"); line_num_stmts_str = _("Line number statements"); end_of_seq_str = _("end of sequence"); set_addr_to_str = _("set address to"); copy_str = _("copy"); } static void cleanup_list (struct section_argument *list) { while (list != NULL) { struct section_argument *a = list; list = a->next; free (a); } } #ifdef USE_LOCKS /* Estimate the maximum number of threads. This is normally #CPU. Return value is guaranteed to be at least 1. */ static int default_concurrency (void) { unsigned aff = 0; #ifdef HAVE_SCHED_GETAFFINITY { int ret; cpu_set_t mask; CPU_ZERO (&mask); ret = sched_getaffinity (0, sizeof(mask), &mask); if (ret == 0) aff = CPU_COUNT (&mask); } #endif unsigned fn = 0; #ifdef HAVE_GETRLIMIT { struct rlimit rlim; int rc = getrlimit (RLIMIT_NOFILE, &rlim); if (rc == 0) fn = MAX ((rlim_t) 1, (rlim.rlim_cur - 100) / 2); /* Conservatively estimate that at least 2 fds are used by each thread. */ } #endif unsigned d = MIN (MAX (aff, 1U), MAX (fn, 1U)); return d; } #endif int main (int argc, char *argv[]) { /* We use no threads here which can interfere with handling a stream. */ (void) __fsetlocking (stdout, FSETLOCKING_BYCALLER); /* Set locale. */ setlocale (LC_ALL, ""); /* Initialize the message catalog. */ textdomain (PACKAGE_TARNAME); /* Look up once. */ init_gettext_strs (); /* Parse and process arguments. */ int remaining; argp_parse (&argp, argc, argv, 0, &remaining, NULL); /* Before we start tell the ELF library which version we are using. */ elf_version (EV_CURRENT); #ifdef USE_LOCKS /* If concurrency wasn't set by argp_parse, then set a default value. */ if (max_threads == 0) max_threads = default_concurrency (); #endif /* Now process all the files given at the command line. */ bool only_one = remaining + 1 == argc; do { /* Open the file. */ int fd = open (argv[remaining], O_RDONLY); if (fd == -1) { error (0, errno, _("cannot open input file '%s'"), argv[remaining]); continue; } process_file (fd, argv[remaining], only_one); close (fd); } while (++remaining < argc); cleanup_list (dump_data_sections); cleanup_list (string_sections); return error_message_count != 0; } static void add_dump_section (const char *name, int key, bool implicit) { struct section_argument *a = xmalloc (sizeof *a); a->arg = name; a->next = NULL; a->implicit = implicit; struct section_argument ***tailp = key == 'x' ? &dump_data_sections_tail : &string_sections_tail; **tailp = a; *tailp = &a->next; } /* Handle program arguments. */ static error_t parse_opt (int key, char *arg, struct argp_state *state __attribute__ ((unused))) { switch (key) { case 'a': print_file_header = true; print_program_header = true; print_relocations = true; print_section_header = true; print_symbol_table = true; print_version_info = true; print_dynamic_table = true; print_section_groups = true; print_histogram = true; print_arch = true; print_notes = true; implicit_debug_sections |= section_exception; add_dump_section (".strtab", key, true); add_dump_section (".dynstr", key, true); add_dump_section (".comment", key, true); any_control_option = true; break; case 'A': print_arch = true; any_control_option = true; break; case 'd': print_dynamic_table = true; any_control_option = true; break; case 'D': use_dynamic_segment = true; break; case 'e': print_debug_sections |= section_exception; any_control_option = true; break; case 'g': print_section_groups = true; any_control_option = true; break; case 'h': print_file_header = true; any_control_option = true; break; case 'I': print_histogram = true; any_control_option = true; break; case 'l': print_program_header = true; any_control_option = true; break; case 'n': print_notes = true; any_control_option = true; notes_section = arg; break; case 'r': print_relocations = true; any_control_option = true; break; case 'S': print_section_header = true; any_control_option = true; break; case 's': print_symbol_table = true; any_control_option = true; symbol_table_section = arg; break; case PRINT_DYNSYM_TABLE: print_dynsym_table = true; any_control_option = true; break; case 'V': print_version_info = true; any_control_option = true; break; case 'c': print_archive_index = true; break; #if USE_LOCKS case 'C': if (arg != NULL) { max_threads = atoi (arg); if (max_threads < 1) { argp_error (state, _("-C NUM minimum 1")); return EINVAL; } } break; #endif case 'w': if (arg == NULL) { print_debug_sections = section_all; implicit_debug_sections = section_info; show_split_units = true; } else if (strcmp (arg, "abbrev") == 0) print_debug_sections |= section_abbrev; else if (strcmp (arg, "addr") == 0) { print_debug_sections |= section_addr; implicit_debug_sections |= section_info; } else if (strcmp (arg, "aranges") == 0) print_debug_sections |= section_aranges; else if (strcmp (arg, "decodedaranges") == 0) { print_debug_sections |= section_aranges; decodedaranges = true; } else if (strcmp (arg, "ranges") == 0) { print_debug_sections |= section_ranges; implicit_debug_sections |= section_info; } else if (strcmp (arg, "frame") == 0 || strcmp (arg, "frames") == 0) print_debug_sections |= section_frame; else if (strcmp (arg, "info") == 0) { print_debug_sections |= section_info; print_debug_sections |= section_types; } else if (strcmp (arg, "info+") == 0) { print_debug_sections |= section_info; print_debug_sections |= section_types; show_split_units = true; } else if (strcmp (arg, "loc") == 0) { print_debug_sections |= section_loc; implicit_debug_sections |= section_info; } else if (strcmp (arg, "line") == 0) print_debug_sections |= section_line; else if (strcmp (arg, "decodedline") == 0) { print_debug_sections |= section_line; decodedline = true; } else if (strcmp (arg, "pubnames") == 0) print_debug_sections |= section_pubnames; else if (strcmp (arg, "str") == 0) { print_debug_sections |= section_str; /* For mapping string offset tables to CUs. */ implicit_debug_sections |= section_info; } else if (strcmp (arg, "macinfo") == 0) print_debug_sections |= section_macinfo; else if (strcmp (arg, "macro") == 0) print_debug_sections |= section_macro; else if (strcmp (arg, "exception") == 0) print_debug_sections |= section_exception; else if (strcmp (arg, "gdb_index") == 0) print_debug_sections |= section_gdb_index; else if (strcmp (arg, "cu_index") == 0) print_debug_sections |= section_cu_index; else { fprintf (stderr, _("Unknown DWARF debug section `%s'.\n"), arg); argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name); exit (1); } any_control_option = true; break; case 'p': any_control_option = true; if (arg == NULL) { print_string_sections = true; break; } FALLTHROUGH; case 'x': add_dump_section (arg, key, false); any_control_option = true; break; case 'N': print_address_names = false; break; case 'U': print_unresolved_addresses = true; break; case ARGP_KEY_NO_ARGS: fputs (_("Missing file name.\n"), stderr); goto do_argp_help; case ARGP_KEY_FINI: if (! any_control_option && ! print_archive_index) { fputs (_("No operation specified.\n"), stderr); do_argp_help: argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name); exit (EXIT_FAILURE); } break; case 'W': /* Ignored. */ break; case 'z': print_decompress = true; break; case ELF_INPUT_SECTION: if (arg == NULL) elf_input_section = ".gnu_debugdata"; else elf_input_section = arg; break; case DWARF_SKELETON: dwarf_skeleton = arg; break; default: return ARGP_ERR_UNKNOWN; } return 0; } /* Create a file descriptor to read the data from the elf_input_section given a file descriptor to an ELF file. */ static int open_input_section (int fd) { size_t shnums; size_t cnt; size_t shstrndx; Elf *elf = elf_begin (fd, ELF_C_READ_MMAP, NULL); if (elf == NULL) { error (0, 0, _("cannot generate Elf descriptor: %s"), elf_errmsg (-1)); return -1; } if (elf_getshdrnum (elf, &shnums) < 0) { error (0, 0, _("cannot determine number of sections: %s"), elf_errmsg (-1)); open_error: elf_end (elf); return -1; } if (elf_getshdrstrndx (elf, &shstrndx) < 0) { error (0, 0, _("cannot get section header string table index")); goto open_error; } for (cnt = 0; cnt < shnums; ++cnt) { Elf_Scn *scn = elf_getscn (elf, cnt); if (scn == NULL) { error (0, 0, _("cannot get section: %s"), elf_errmsg (-1)); goto open_error; } GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (unlikely (shdr == NULL)) { error (0, 0, _("cannot get section header: %s"), elf_errmsg (-1)); goto open_error; } const char *sname = elf_strptr (elf, shstrndx, shdr->sh_name); if (sname == NULL) { error (0, 0, _("cannot get section name")); goto open_error; } if (strcmp (sname, elf_input_section) == 0) { Elf_Data *data = elf_rawdata (scn, NULL); if (data == NULL) { error (0, 0, _("cannot get %s content: %s"), sname, elf_errmsg (-1)); goto open_error; } /* Create (and immediately unlink) a temporary file to store section data in to create a file descriptor for it. */ const char *tmpdir = getenv ("TMPDIR") ?: P_tmpdir; static const char suffix[] = "/readelfXXXXXX"; int tmplen = strlen (tmpdir) + sizeof (suffix); char *tempname = alloca (tmplen); sprintf (tempname, "%s%s", tmpdir, suffix); int sfd = mkstemp (tempname); if (sfd == -1) { error (0, 0, _("cannot create temp file '%s'"), tempname); goto open_error; } unlink (tempname); ssize_t size = data->d_size; if (write_retry (sfd, data->d_buf, size) != size) { error (0, 0, _("cannot write section data")); goto open_error; } if (elf_end (elf) != 0) { error (0, 0, _("error while closing Elf descriptor: %s"), elf_errmsg (-1)); return -1; } if (lseek (sfd, 0, SEEK_SET) == -1) { error (0, 0, _("error while rewinding file descriptor")); return -1; } return sfd; } } /* Named section not found. */ if (elf_end (elf) != 0) error (0, 0, _("error while closing Elf descriptor: %s"), elf_errmsg (-1)); return -1; } /* Check if the file is an archive, and if so dump its index. */ static void check_archive_index (int fd, const char *fname, bool only_one) { /* Create an `Elf' descriptor. */ Elf *elf = elf_begin (fd, ELF_C_READ_MMAP, NULL); if (elf == NULL) error (0, 0, _("cannot generate Elf descriptor: %s"), elf_errmsg (-1)); else { if (elf_kind (elf) == ELF_K_AR) { if (!only_one) printf ("\n%s:\n\n", fname); dump_archive_index (elf, fname); } else error (0, 0, _("'%s' is not an archive, cannot print archive index"), fname); /* Now we can close the descriptor. */ if (elf_end (elf) != 0) error (0, 0, _("error while closing Elf descriptor: %s"), elf_errmsg (-1)); } } /* Trivial callback used for checking if we opened an archive. */ static int count_dwflmod (Dwfl_Module *dwflmod __attribute__ ((unused)), void **userdata __attribute__ ((unused)), const char *name __attribute__ ((unused)), Dwarf_Addr base __attribute__ ((unused)), void *arg) { if (*(bool *) arg) return DWARF_CB_ABORT; *(bool *) arg = true; return DWARF_CB_OK; } struct process_dwflmod_args { int fd; bool only_one; }; static int process_dwflmod (Dwfl_Module *dwflmod, void **userdata __attribute__ ((unused)), const char *name __attribute__ ((unused)), Dwarf_Addr base __attribute__ ((unused)), void *arg) { const struct process_dwflmod_args *a = arg; /* Print the file name. */ if (!a->only_one) { const char *fname; dwfl_module_info (dwflmod, NULL, NULL, NULL, NULL, NULL, &fname, NULL); printf ("\n%s:\n\n", fname); } process_elf_file (dwflmod, a->fd); return DWARF_CB_OK; } /* Stub libdwfl callback, only the ELF handle already open is ever used. Only used for finding the alternate debug file if the Dwarf comes from the main file. We are not interested in separate debuginfo. */ static int find_no_debuginfo (Dwfl_Module *mod, void **userdata, const char *modname, Dwarf_Addr base, const char *file_name, const char *debuglink_file, GElf_Word debuglink_crc, char **debuginfo_file_name) { Dwarf_Addr dwbias; dwfl_module_info (mod, NULL, NULL, NULL, &dwbias, NULL, NULL, NULL); /* We are only interested if the Dwarf has been setup on the main elf file but is only missing the alternate debug link. If dwbias hasn't even been setup, this is searching for separate debuginfo for the main elf. We don't care in that case. */ if (dwbias == (Dwarf_Addr) -1) return -1; return dwfl_standard_find_debuginfo (mod, userdata, modname, base, file_name, debuglink_file, debuglink_crc, debuginfo_file_name); } static Dwfl * create_dwfl (int fd, const char *fname) { /* Duplicate an fd for dwfl_report_offline to swallow. */ int dwfl_fd = dup (fd); if (unlikely (dwfl_fd < 0)) error_exit (errno, "dup"); /* Use libdwfl in a trivial way to open the libdw handle for us. This takes care of applying relocations to DWARF data in ET_REL files. */ static const Dwfl_Callbacks callbacks = { .section_address = dwfl_offline_section_address, .find_debuginfo = find_no_debuginfo }; Dwfl *dwfl = dwfl_begin (&callbacks); if (likely (dwfl != NULL)) /* Let 0 be the logical address of the file (or first in archive). */ dwfl->offline_next_address = 0; if (dwfl_report_offline (dwfl, fname, fname, dwfl_fd) == NULL) { struct stat st; if (fstat (dwfl_fd, &st) != 0) error (0, errno, _("cannot stat input file")); else if (unlikely (st.st_size == 0)) error (0, 0, _("input file is empty")); else error (0, 0, _("failed reading '%s': %s"), fname, dwfl_errmsg (-1)); close (dwfl_fd); /* Consumed on success, not on failure. */ dwfl_end (dwfl); dwfl = NULL; } else dwfl_report_end (dwfl, NULL, NULL); return dwfl; } /* Process one input file. */ static void process_file (int fd, const char *fname, bool only_one) { if (print_archive_index) check_archive_index (fd, fname, only_one); if (!any_control_option) return; if (elf_input_section != NULL) { /* Replace fname and fd with section content. */ char *fnname = alloca (strlen (fname) + strlen (elf_input_section) + 2); sprintf (fnname, "%s:%s", fname, elf_input_section); fd = open_input_section (fd); if (fd == -1) { error (0, 0, _("No such section '%s' in '%s'"), elf_input_section, fname); return; } fname = fnname; } Dwfl *dwfl = create_dwfl (fd, fname); if (dwfl != NULL) { if (only_one) { /* Clear ONLY_ONE if we have multiple modules, from an archive. */ bool seen = false; only_one = dwfl_getmodules (dwfl, &count_dwflmod, &seen, 0) == 0; } /* Process the one or more modules gleaned from this file. */ struct process_dwflmod_args a = { .fd = fd, .only_one = only_one }; dwfl_getmodules (dwfl, &process_dwflmod, &a, 0); } /* Terrible hack for hooking unrelated skeleton/split compile units, see __libdw_link_skel_split in print_debug. */ if (! do_not_close_dwfl) dwfl_end (dwfl); /* Need to close the replaced fd if we created it. Caller takes care of original. */ if (elf_input_section != NULL) close (fd); } /* Check whether there are any compressed sections in the ELF file. */ static bool elf_contains_chdrs (Elf *elf) { Elf_Scn *scn = NULL; while ((scn = elf_nextscn (elf, scn)) != NULL) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr != NULL && (shdr->sh_flags & SHF_COMPRESSED) != 0) return true; } return false; } /* Process one ELF file. */ static void process_elf_file (Dwfl_Module *dwflmod, int fd) { GElf_Addr dwflbias; Elf *elf = dwfl_module_getelf (dwflmod, &dwflbias); GElf_Ehdr ehdr_mem; GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem); if (ehdr == NULL) { error (0, 0, _("cannot read ELF header: %s"), elf_errmsg (-1)); return; } Ebl *ebl = ebl_openbackend (elf); if (unlikely (ebl == NULL)) { ebl_error: error (0, errno, _("cannot create EBL handle")); return; } /* Determine the number of sections. */ if (unlikely (elf_getshdrnum (ebl->elf, &shnum) < 0)) error_exit (0, _("cannot determine number of sections: %s"), elf_errmsg (-1)); /* Determine the number of phdrs. */ if (unlikely (elf_getphdrnum (ebl->elf, &phnum) < 0)) error_exit (0, _("cannot determine number of program headers: %s"), elf_errmsg (-1)); /* For an ET_REL file, libdwfl has adjusted the in-core shdrs and may have applied relocation to some sections. If there are any compressed sections, any pass (or libdw/libdwfl) might have uncompressed them. So we need to get a fresh Elf handle on the file to display those. */ bool print_unchanged = ((print_section_header || print_relocations || dump_data_sections != NULL || print_notes) && (ehdr->e_type == ET_REL || elf_contains_chdrs (ebl->elf))); Elf *pure_elf = NULL; Ebl *pure_ebl = ebl; if (print_unchanged) { /* Read the file afresh. */ off_t aroff = elf_getaroff (elf); pure_elf = dwelf_elf_begin (fd); if (aroff > 0) { /* Archive member. */ (void) elf_rand (pure_elf, aroff); Elf *armem = elf_begin (-1, ELF_C_READ_MMAP, pure_elf); elf_end (pure_elf); pure_elf = armem; } if (pure_elf == NULL) { error (0, 0, _("cannot read ELF: %s"), elf_errmsg (-1)); return; } pure_ebl = ebl_openbackend (pure_elf); if (pure_ebl == NULL) goto ebl_error; } bool symtab_printed = false; if (print_file_header) print_ehdr (ebl, ehdr); if (print_section_header) print_shdr (pure_ebl, ehdr); if (print_program_header) print_phdr (ebl, ehdr); if (print_section_groups) print_scngrp (ebl); if (print_dynamic_table) print_dynamic (ebl); if (print_relocations) print_relocs (pure_ebl, dwflmod, ehdr); if (print_histogram) handle_hash (ebl); if (print_symbol_table || print_dynsym_table) symtab_printed |= print_symtab (ebl, SHT_DYNSYM); if (print_version_info) print_verinfo (ebl); if (print_symbol_table && !use_dynamic_segment) symtab_printed |= print_symtab (ebl, SHT_SYMTAB); if ((print_symbol_table || print_dynsym_table) && !symtab_printed && symbol_table_section != NULL) printf ("WARNING: %s: '%s'\n", _("cannot find section"), symbol_table_section); if (print_arch) print_liblist (ebl); if (print_arch) print_attributes (ebl, ehdr); if (dump_data_sections != NULL) dump_data (pure_ebl); if (string_sections != NULL) dump_strings (ebl); if ((print_debug_sections | implicit_debug_sections) != 0) print_debug (dwflmod, ebl, ehdr); if (print_notes) handle_notes (pure_ebl, ehdr); if (print_string_sections) print_strings (ebl); if (pure_ebl != ebl) { ebl_closebackend (ebl); ebl_closebackend (pure_ebl); elf_end (pure_elf); } else ebl_closebackend (ebl); } /* Print file type. */ static void print_file_type (unsigned short int e_type) { if (likely (e_type <= ET_CORE)) { static const char *const knowntypes[] = { N_("NONE (None)"), N_("REL (Relocatable file)"), N_("EXEC (Executable file)"), N_("DYN (Shared object file)"), N_("CORE (Core file)") }; puts (_(knowntypes[e_type])); } else if (e_type >= ET_LOOS && e_type <= ET_HIOS) printf (_("OS Specific: (%x)\n"), e_type); else if (e_type >= ET_LOPROC /* && e_type <= ET_HIPROC always true */) printf (_("Processor Specific: (%x)\n"), e_type); else puts ("???"); } /* Print ELF header. */ static void print_ehdr (Ebl *ebl, GElf_Ehdr *ehdr) { fputs (_("ELF Header:\n Magic: "), stdout); for (size_t cnt = 0; cnt < EI_NIDENT; ++cnt) printf (" %02hhx", ehdr->e_ident[cnt]); printf (_("\n Class: %s\n"), ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? "ELF32" : ehdr->e_ident[EI_CLASS] == ELFCLASS64 ? "ELF64" : "\?\?\?"); printf (_(" Data: %s\n"), ehdr->e_ident[EI_DATA] == ELFDATA2LSB ? "2's complement, little endian" : ehdr->e_ident[EI_DATA] == ELFDATA2MSB ? "2's complement, big endian" : "\?\?\?"); printf (_(" Ident Version: %hhd %s\n"), ehdr->e_ident[EI_VERSION], ehdr->e_ident[EI_VERSION] == EV_CURRENT ? _("(current)") : "(\?\?\?)"); char buf[512]; printf (_(" OS/ABI: %s\n"), ebl_osabi_name (ebl, ehdr->e_ident[EI_OSABI], buf, sizeof (buf))); printf (_(" ABI Version: %hhd\n"), ehdr->e_ident[EI_ABIVERSION]); fputs (_(" Type: "), stdout); print_file_type (ehdr->e_type); const char *machine = dwelf_elf_e_machine_string (ehdr->e_machine); if (machine != NULL) printf (_(" Machine: %s\n"), machine); else printf (_(" Machine: <unknown>: 0x%x\n"), ehdr->e_machine); printf (_(" Version: %d %s\n"), ehdr->e_version, ehdr->e_version == EV_CURRENT ? _("(current)") : "(\?\?\?)"); printf (_(" Entry point address: %#" PRIx64 "\n"), ehdr->e_entry); printf (_(" Start of program headers: %" PRId64 " %s\n"), ehdr->e_phoff, _("(bytes into file)")); printf (_(" Start of section headers: %" PRId64 " %s\n"), ehdr->e_shoff, _("(bytes into file)")); printf (_(" Flags: %s\n"), ebl_machine_flag_name (ebl, ehdr->e_flags, buf, sizeof (buf))); printf (_(" Size of this header: %" PRIu16 " %s\n"), ehdr->e_ehsize, _("(bytes)")); printf (_(" Size of program header entries: %" PRIu16 " %s\n"), ehdr->e_phentsize, _("(bytes)")); printf (_(" Number of program headers entries: %" PRIu16), ehdr->e_phnum); if (ehdr->e_phnum == PN_XNUM) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem); if (shdr != NULL) printf (_(" (%" PRIu32 " in [0].sh_info)"), (uint32_t) shdr->sh_info); else fputs (_(" ([0] not available)"), stdout); } fputc ('\n', stdout); printf (_(" Size of section header entries: %" PRIu16 " %s\n"), ehdr->e_shentsize, _("(bytes)")); printf (_(" Number of section headers entries: %" PRIu16), ehdr->e_shnum); if (ehdr->e_shnum == 0) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem); if (shdr != NULL) printf (_(" (%" PRIu32 " in [0].sh_size)"), (uint32_t) shdr->sh_size); else fputs (_(" ([0] not available)"), stdout); } fputc ('\n', stdout); if (unlikely (ehdr->e_shstrndx == SHN_XINDEX)) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem); if (shdr != NULL) /* We managed to get the zeroth section. */ snprintf (buf, sizeof (buf), _(" (%" PRIu32 " in [0].sh_link)"), (uint32_t) shdr->sh_link); else { strncpy (buf, _(" ([0] not available)"), sizeof (buf) - 1); buf[sizeof (buf) - 1] = '\0'; } printf (_(" Section header string table index: XINDEX%s\n\n"), buf); } else printf (_(" Section header string table index: %" PRIu16 "\n\n"), ehdr->e_shstrndx); } static const char * get_visibility_type (int value) { switch (value) { case STV_DEFAULT: return "DEFAULT"; case STV_INTERNAL: return "INTERNAL"; case STV_HIDDEN: return "HIDDEN"; case STV_PROTECTED: return "PROTECTED"; default: return "???"; } } static const char * elf_ch_type_name (unsigned int code) { switch (code) { case 0: return "NONE"; case ELFCOMPRESS_ZLIB: return "ZLIB"; case ELFCOMPRESS_ZSTD: return "ZSTD"; default: return "UNKNOWN"; } } /* Print the section headers. */ static void print_shdr (Ebl *ebl, GElf_Ehdr *ehdr) { size_t cnt; size_t shstrndx; if (! print_file_header) { size_t sections; if (unlikely (elf_getshdrnum (ebl->elf, §ions) < 0)) error_exit (0, _("cannot get number of sections: %s"), elf_errmsg (-1)); printf (_("\ There are %zd section headers, starting at offset %#" PRIx64 ":\n\ \n"), sections, ehdr->e_shoff); } /* Get the section header string table index. */ if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index: %s"), elf_errmsg (-1)); puts (_("Section Headers:")); if (ehdr->e_ident[EI_CLASS] == ELFCLASS32) puts (_("[Nr] Name Type Addr Off Size ES Flags Lk Inf Al")); else puts (_("[Nr] Name Type Addr Off Size ES Flags Lk Inf Al")); if (print_decompress) { if (ehdr->e_ident[EI_CLASS] == ELFCLASS32) puts (_(" [Compression Size Al]")); else puts (_(" [Compression Size Al]")); } for (cnt = 0; cnt < shnum; ++cnt) { Elf_Scn *scn = elf_getscn (ebl->elf, cnt); if (unlikely (scn == NULL)) error_exit (0, _("cannot get section: %s"), elf_errmsg (-1)); /* Get the section header. */ GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (unlikely (shdr == NULL)) error_exit (0, _("cannot get section header: %s"), elf_errmsg (-1)); char flagbuf[20]; char *cp = flagbuf; if (shdr->sh_flags & SHF_WRITE) *cp++ = 'W'; if (shdr->sh_flags & SHF_ALLOC) *cp++ = 'A'; if (shdr->sh_flags & SHF_EXECINSTR) *cp++ = 'X'; if (shdr->sh_flags & SHF_MERGE) *cp++ = 'M'; if (shdr->sh_flags & SHF_STRINGS) *cp++ = 'S'; if (shdr->sh_flags & SHF_INFO_LINK) *cp++ = 'I'; if (shdr->sh_flags & SHF_LINK_ORDER) *cp++ = 'L'; if (shdr->sh_flags & SHF_OS_NONCONFORMING) *cp++ = 'N'; if (shdr->sh_flags & SHF_GROUP) *cp++ = 'G'; if (shdr->sh_flags & SHF_TLS) *cp++ = 'T'; if (shdr->sh_flags & SHF_COMPRESSED) *cp++ = 'C'; if (shdr->sh_flags & SHF_ORDERED) *cp++ = 'O'; if (shdr->sh_flags & SHF_EXCLUDE) *cp++ = 'E'; if (shdr->sh_flags & SHF_GNU_RETAIN) *cp++ = 'R'; *cp = '\0'; const char *sname; char buf[128]; sname = elf_strptr (ebl->elf, shstrndx, shdr->sh_name) ?: "<corrupt>"; printf ("[%2zu] %-20s %-12s %0*" PRIx64 " %0*" PRIx64 " %0*" PRIx64 " %2" PRId64 " %-5s %2" PRId32 " %3" PRId32 " %2" PRId64 "\n", cnt, sname, ebl_section_type_name (ebl, shdr->sh_type, buf, sizeof (buf)), ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 8 : 16, shdr->sh_addr, ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8, shdr->sh_offset, ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8, shdr->sh_size, shdr->sh_entsize, flagbuf, shdr->sh_link, shdr->sh_info, shdr->sh_addralign); if (print_decompress) { if ((shdr->sh_flags & SHF_COMPRESSED) != 0) { GElf_Chdr chdr; if (gelf_getchdr (scn, &chdr) != NULL) printf (" [ELF %s (%" PRId32 ") %0*" PRIx64 " %2" PRId64 "]\n", elf_ch_type_name (chdr.ch_type), chdr.ch_type, ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8, chdr.ch_size, chdr.ch_addralign); else error (0, 0, _("bad compression header for section %zd: %s"), elf_ndxscn (scn), elf_errmsg (-1)); } else if (startswith (sname, ".zdebug")) { ssize_t size; if ((size = dwelf_scn_gnu_compressed_size (scn)) >= 0) printf (" [GNU ZLIB %0*zx ]\n", ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8, size); else error (0, 0, _("bad gnu compressed size for section %zd: %s"), elf_ndxscn (scn), elf_errmsg (-1)); } } } print_flag_info(); fputc ('\n', stdout); } /* Print flag information. */ static void print_flag_info (void) { puts ("Key to Flags:"); puts (" W (write), A (alloc), X (execute), M (merge), S (strings), I (info),"); puts (" L (link order), N (extra OS processing required), G (group), T (TLS),"); puts (" C (compressed), O (ordered), R (GNU retain), E (exclude)"); } /* Print the program header. */ static void print_phdr (Ebl *ebl, GElf_Ehdr *ehdr) { if (phnum == 0) /* No program header, this is OK in relocatable objects. */ return; puts (_("Program Headers:")); if (ehdr->e_ident[EI_CLASS] == ELFCLASS32) puts (_("\ Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align")); else puts (_("\ Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align")); /* Process all program headers. */ bool has_relro = false; GElf_Addr relro_from = 0; GElf_Addr relro_to = 0; for (size_t cnt = 0; cnt < phnum; ++cnt) { char buf[128]; GElf_Phdr mem; GElf_Phdr *phdr = gelf_getphdr (ebl->elf, cnt, &mem); /* If for some reason the header cannot be returned show this. */ if (unlikely (phdr == NULL)) { puts (" ???"); continue; } printf (" %-14s 0x%06" PRIx64 " 0x%0*" PRIx64 " 0x%0*" PRIx64 " 0x%06" PRIx64 " 0x%06" PRIx64 " %c%c%c 0x%" PRIx64 "\n", ebl_segment_type_name (ebl, phdr->p_type, buf, sizeof (buf)), phdr->p_offset, ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 8 : 16, phdr->p_vaddr, ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 8 : 16, phdr->p_paddr, phdr->p_filesz, phdr->p_memsz, phdr->p_flags & PF_R ? 'R' : ' ', phdr->p_flags & PF_W ? 'W' : ' ', phdr->p_flags & PF_X ? 'E' : ' ', phdr->p_align); if (phdr->p_type == PT_INTERP) { /* If we are sure the file offset is valid then we can show the user the name of the interpreter. We check whether there is a section at the file offset. Normally there would be a section called ".interp". But in separate .debug files it is a NOBITS section (and so doesn't match with gelf_offscn). Which probably means the offset is not valid another reason could be because the ELF file just doesn't contain any section headers, in that case just play it safe and don't display anything. */ Elf_Scn *scn = gelf_offscn (ebl->elf, phdr->p_offset); GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); size_t maxsize; char *filedata = elf_rawfile (ebl->elf, &maxsize); if (shdr != NULL && shdr->sh_type == SHT_PROGBITS && filedata != NULL && phdr->p_offset < maxsize && phdr->p_filesz <= maxsize - phdr->p_offset && memchr (filedata + phdr->p_offset, '\0', phdr->p_filesz) != NULL) printf (_("\t[Requesting program interpreter: %s]\n"), filedata + phdr->p_offset); } else if (phdr->p_type == PT_GNU_RELRO) { has_relro = true; relro_from = phdr->p_vaddr; relro_to = relro_from + phdr->p_memsz; } } size_t sections; if (unlikely (elf_getshdrnum (ebl->elf, §ions) < 0)) error_exit (0, _("cannot get number of sections: %s"), elf_errmsg (-1)); if (sections == 0) /* No sections in the file. Punt. */ return; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); puts (_("\n Section to Segment mapping:\n Segment Sections...")); for (size_t cnt = 0; cnt < phnum; ++cnt) { /* Print the segment number. */ printf (" %2.2zu ", cnt); GElf_Phdr phdr_mem; GElf_Phdr *phdr = gelf_getphdr (ebl->elf, cnt, &phdr_mem); /* This must not happen. */ if (unlikely (phdr == NULL)) error_exit (0, _("cannot get program header: %s"), elf_errmsg (-1)); /* Iterate over the sections. */ bool in_relro = false; bool in_ro = false; for (size_t inner = 1; inner < shnum; ++inner) { Elf_Scn *scn = elf_getscn (ebl->elf, inner); /* This should not happen. */ if (unlikely (scn == NULL)) error_exit (0, _("cannot get section: %s"), elf_errmsg (-1)); /* Get the section header. */ GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (unlikely (shdr == NULL)) error_exit (0, _("cannot get section header: %s"), elf_errmsg (-1)); if (shdr->sh_size > 0 /* Compare allocated sections by VMA, unallocated sections by file offset. */ && (shdr->sh_flags & SHF_ALLOC ? (shdr->sh_addr >= phdr->p_vaddr && (shdr->sh_addr + shdr->sh_size <= phdr->p_vaddr + phdr->p_memsz)) : (shdr->sh_offset >= phdr->p_offset && (shdr->sh_offset + shdr->sh_size <= phdr->p_offset + phdr->p_filesz)))) { if (has_relro && !in_relro && shdr->sh_addr >= relro_from && shdr->sh_addr + shdr->sh_size <= relro_to) { fputs (" [RELRO:", stdout); in_relro = true; } else if (has_relro && in_relro && shdr->sh_addr >= relro_to) { fputs ("]", stdout); in_relro = false; } else if (has_relro && in_relro && shdr->sh_addr + shdr->sh_size > relro_to) fputs ("] <RELRO:", stdout); else if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_W) == 0) { if (!in_ro) { fputs (" [RO:", stdout); in_ro = true; } } else { /* Determine the segment this section is part of. */ size_t cnt2; GElf_Phdr phdr2_mem; GElf_Phdr *phdr2 = NULL; for (cnt2 = 0; cnt2 < phnum; ++cnt2) { phdr2 = gelf_getphdr (ebl->elf, cnt2, &phdr2_mem); if (phdr2 != NULL && phdr2->p_type == PT_LOAD && shdr->sh_addr >= phdr2->p_vaddr && (shdr->sh_addr + shdr->sh_size <= phdr2->p_vaddr + phdr2->p_memsz)) break; } if (cnt2 < phnum) { if ((phdr2->p_flags & PF_W) == 0 && !in_ro) { fputs (" [RO:", stdout); in_ro = true; } else if ((phdr2->p_flags & PF_W) != 0 && in_ro) { fputs ("]", stdout); in_ro = false; } } } printf (" %s", elf_strptr (ebl->elf, shstrndx, shdr->sh_name)); /* Signal that this section is only partially covered. */ if (has_relro && in_relro && shdr->sh_addr + shdr->sh_size > relro_to) { fputs (">", stdout); in_relro = false; } } } if (in_relro || in_ro) fputs ("]", stdout); /* Finish the line. */ fputc ('\n', stdout); } } static const char * section_name (Ebl *ebl, GElf_Shdr *shdr) { size_t shstrndx; if (shdr == NULL || elf_getshdrstrndx (ebl->elf, &shstrndx) < 0) return "???"; return elf_strptr (ebl->elf, shstrndx, shdr->sh_name) ?: "???"; } static void handle_scngrp (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) { /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link); GElf_Shdr symshdr_mem; GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem); Elf_Data *symdata = elf_getdata (symscn, NULL); if (data == NULL || data->d_size < sizeof (Elf32_Word) || symshdr == NULL || symdata == NULL) return; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); Elf32_Word *grpref = (Elf32_Word *) data->d_buf; GElf_Sym sym_mem; GElf_Sym *sym = gelf_getsym (symdata, shdr->sh_info, &sym_mem); printf ((grpref[0] & GRP_COMDAT) ? ngettext ("\ \nCOMDAT section group [%2zu] '%s' with signature '%s' contains %zu entry:\n", "\ \nCOMDAT section group [%2zu] '%s' with signature '%s' contains %zu entries:\n", data->d_size / sizeof (Elf32_Word) - 1) : ngettext ("\ \nSection group [%2zu] '%s' with signature '%s' contains %zu entry:\n", "\ \nSection group [%2zu] '%s' with signature '%s' contains %zu entries:\n", data->d_size / sizeof (Elf32_Word) - 1), elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), (sym == NULL ? NULL : elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name)) ?: _("<INVALID SYMBOL>"), data->d_size / sizeof (Elf32_Word) - 1); for (size_t cnt = 1; cnt < data->d_size / sizeof (Elf32_Word); ++cnt) { GElf_Shdr grpshdr_mem; GElf_Shdr *grpshdr = gelf_getshdr (elf_getscn (ebl->elf, grpref[cnt]), &grpshdr_mem); const char *str; printf (" [%2u] %s\n", grpref[cnt], grpshdr != NULL && (str = elf_strptr (ebl->elf, shstrndx, grpshdr->sh_name)) ? str : _("<INVALID SECTION>")); } } static void print_scngrp (Ebl *ebl) { /* Find all relocation sections and handle them. */ Elf_Scn *scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { /* Handle the section if it is a symbol table. */ GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr != NULL && shdr->sh_type == SHT_GROUP) { if ((shdr->sh_flags & SHF_COMPRESSED) != 0) { if (elf_compress (scn, 0, 0) < 0) printf ("WARNING: %s [%zd]\n", _("Couldn't uncompress section"), elf_ndxscn (scn)); shdr = gelf_getshdr (scn, &shdr_mem); if (unlikely (shdr == NULL)) error_exit (0, _("cannot get section [%zd] header: %s"), elf_ndxscn (scn), elf_errmsg (-1)); } handle_scngrp (ebl, scn, shdr); } } } static const struct flags { int mask; const char *str; } dt_flags[] = { { DF_ORIGIN, "ORIGIN" }, { DF_SYMBOLIC, "SYMBOLIC" }, { DF_TEXTREL, "TEXTREL" }, { DF_BIND_NOW, "BIND_NOW" }, { DF_STATIC_TLS, "STATIC_TLS" } }; static const int ndt_flags = sizeof (dt_flags) / sizeof (dt_flags[0]); static const struct flags dt_flags_1[] = { { DF_1_NOW, "NOW" }, { DF_1_GLOBAL, "GLOBAL" }, { DF_1_GROUP, "GROUP" }, { DF_1_NODELETE, "NODELETE" }, { DF_1_LOADFLTR, "LOADFLTR" }, { DF_1_INITFIRST, "INITFIRST" }, { DF_1_NOOPEN, "NOOPEN" }, { DF_1_ORIGIN, "ORIGIN" }, { DF_1_DIRECT, "DIRECT" }, { DF_1_TRANS, "TRANS" }, { DF_1_INTERPOSE, "INTERPOSE" }, { DF_1_NODEFLIB, "NODEFLIB" }, { DF_1_NODUMP, "NODUMP" }, { DF_1_CONFALT, "CONFALT" }, { DF_1_ENDFILTEE, "ENDFILTEE" }, { DF_1_DISPRELDNE, "DISPRELDNE" }, { DF_1_DISPRELPND, "DISPRELPND" }, }; static const int ndt_flags_1 = sizeof (dt_flags_1) / sizeof (dt_flags_1[0]); static const struct flags dt_feature_1[] = { { DTF_1_PARINIT, "PARINIT" }, { DTF_1_CONFEXP, "CONFEXP" } }; static const int ndt_feature_1 = (sizeof (dt_feature_1) / sizeof (dt_feature_1[0])); static const struct flags dt_posflag_1[] = { { DF_P1_LAZYLOAD, "LAZYLOAD" }, { DF_P1_GROUPPERM, "GROUPPERM" } }; static const int ndt_posflag_1 = (sizeof (dt_posflag_1) / sizeof (dt_posflag_1[0])); static void print_flags (int class, GElf_Xword d_val, const struct flags *flags, int nflags) { bool first = true; int cnt; for (cnt = 0; cnt < nflags; ++cnt) if (d_val & flags[cnt].mask) { if (!first) putchar (' '); fputs (flags[cnt].str, stdout); d_val &= ~flags[cnt].mask; first = false; } if (d_val != 0) { if (!first) putchar (' '); printf ("%#0*" PRIx64, class == ELFCLASS32 ? 10 : 18, d_val); } putchar ('\n'); } static void print_dt_flags (int class, GElf_Xword d_val) { print_flags (class, d_val, dt_flags, ndt_flags); } static void print_dt_flags_1 (int class, GElf_Xword d_val) { print_flags (class, d_val, dt_flags_1, ndt_flags_1); } static void print_dt_feature_1 (int class, GElf_Xword d_val) { print_flags (class, d_val, dt_feature_1, ndt_feature_1); } static void print_dt_posflag_1 (int class, GElf_Xword d_val) { print_flags (class, d_val, dt_posflag_1, ndt_posflag_1); } static size_t get_dyn_ents (Elf_Data * dyn_data) { GElf_Dyn *dyn; GElf_Dyn dyn_mem; size_t dyn_idx = 0; do { dyn = gelf_getdyn(dyn_data, dyn_idx, &dyn_mem); if (dyn != NULL) ++dyn_idx; } while (dyn != NULL && dyn->d_tag != DT_NULL); return dyn_idx; } static void handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, GElf_Phdr *phdr) { int class = gelf_getclass (ebl->elf); GElf_Shdr glink_mem; GElf_Shdr *glink; Elf_Data *data; size_t cnt; size_t shstrndx; size_t dyn_ents; /* Get the data of the section. */ if (use_dynamic_segment && phdr != NULL) data = elf_getdata_rawchunk(ebl->elf, phdr->p_offset, phdr->p_filesz, ELF_T_DYN); else data = elf_getdata (scn, NULL); if (data == NULL) return; /* Get the dynamic section entry number */ dyn_ents = get_dyn_ents (data); if (!use_dynamic_segment && shdr != NULL) { /* Get the section header string table index. */ if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); if (glink == NULL) error_exit (0, _("invalid sh_link value in section %zu"), elf_ndxscn (scn)); printf (ngettext ("\ \nDynamic segment contains %lu entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ \nDynamic segment contains %lu entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", dyn_ents), (unsigned long int) dyn_ents, class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (int) shdr->sh_link, elf_strptr (ebl->elf, shstrndx, glink->sh_name)); } else if (phdr != NULL) { printf (ngettext ("\ \nDynamic segment contains %lu entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 "\n", "\ \nDynamic segment contains %lu entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 "\n", dyn_ents), (unsigned long int) dyn_ents, class == ELFCLASS32 ? 10 : 18, phdr->p_paddr, phdr->p_offset); } fputs (_(" Type Value\n"), stdout); /* if --use-dynamic option is enabled, use the string table to get the related library info. */ Elf_Data *strtab_data = NULL; if (use_dynamic_segment && phdr != NULL) { strtab_data = get_dynscn_strtab(ebl->elf, phdr); if (strtab_data == NULL) error_exit (0, _("cannot get string table by using dynamic segment")); } for (cnt = 0; cnt < dyn_ents; ++cnt) { GElf_Dyn dynmem; GElf_Dyn *dyn = gelf_getdyn (data, cnt, &dynmem); if (dyn == NULL) break; char buf[64]; printf (" %-17s ", ebl_dynamic_tag_name (ebl, dyn->d_tag, buf, sizeof (buf))); char *name = NULL; if (dyn->d_tag == DT_NEEDED || dyn->d_tag == DT_SONAME || dyn->d_tag == DT_RPATH || dyn->d_tag == DT_RUNPATH) { if (! use_dynamic_segment && shdr != NULL) name = elf_strptr (ebl->elf, shdr->sh_link, dyn->d_un.d_val); else if (dyn->d_un.d_val < strtab_data->d_size && memrchr (strtab_data->d_buf + dyn->d_un.d_val, '\0', strtab_data->d_size - 1 - dyn->d_un.d_val) != NULL) name = ((char *) strtab_data->d_buf) + dyn->d_un.d_val; } switch (dyn->d_tag) { case DT_NULL: case DT_DEBUG: case DT_BIND_NOW: case DT_TEXTREL: /* No further output. */ fputc ('\n', stdout); break; case DT_NEEDED: printf (_("Shared library: [%s]\n"), name); break; case DT_SONAME: printf (_("Library soname: [%s]\n"), name); break; case DT_RPATH: printf (_("Library rpath: [%s]\n"), name); break; case DT_RUNPATH: printf (_("Library runpath: [%s]\n"), name); break; case DT_PLTRELSZ: case DT_RELASZ: case DT_STRSZ: case DT_RELSZ: case DT_RELRSZ: case DT_RELAENT: case DT_SYMENT: case DT_RELENT: case DT_RELRENT: case DT_PLTPADSZ: case DT_MOVEENT: case DT_MOVESZ: case DT_INIT_ARRAYSZ: case DT_FINI_ARRAYSZ: case DT_SYMINSZ: case DT_SYMINENT: case DT_GNU_CONFLICTSZ: case DT_GNU_LIBLISTSZ: printf (_("%" PRId64 " (bytes)\n"), dyn->d_un.d_val); break; case DT_VERDEFNUM: case DT_VERNEEDNUM: case DT_RELACOUNT: case DT_RELCOUNT: printf ("%" PRId64 "\n", dyn->d_un.d_val); break; case DT_PLTREL:; const char *tagname = ebl_dynamic_tag_name (ebl, dyn->d_un.d_val, NULL, 0); puts (tagname ?: "???"); break; case DT_FLAGS: print_dt_flags (class, dyn->d_un.d_val); break; case DT_FLAGS_1: print_dt_flags_1 (class, dyn->d_un.d_val); break; case DT_FEATURE_1: print_dt_feature_1 (class, dyn->d_un.d_val); break; case DT_POSFLAG_1: print_dt_posflag_1 (class, dyn->d_un.d_val); break; default: printf ("%#0*" PRIx64 "\n", class == ELFCLASS32 ? 10 : 18, dyn->d_un.d_val); break; } } } /* Print the dynamic segment. */ static void print_dynamic (Ebl *ebl) { for (size_t i = 0; i < phnum; ++i) { GElf_Phdr phdr_mem; GElf_Phdr *phdr = gelf_getphdr (ebl->elf, i, &phdr_mem); if (phdr != NULL && phdr->p_type == PT_DYNAMIC) { Elf_Scn *scn = gelf_offscn (ebl->elf, phdr->p_offset); GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if ((use_dynamic_segment && phdr != NULL) || (shdr != NULL && shdr->sh_type == SHT_DYNAMIC)) handle_dynamic (ebl, scn, shdr, phdr); break; } } } /* Print relocations. */ static void print_relocs (Ebl *ebl, Dwfl_Module *mod, GElf_Ehdr *ehdr) { /* Find all relocation sections and handle them. */ Elf_Scn *scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { /* Handle the section if it is a symbol table. */ GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (likely (shdr != NULL)) { if (shdr->sh_type == SHT_REL) handle_relocs_rel (ebl, ehdr, scn, shdr); else if (shdr->sh_type == SHT_RELA) handle_relocs_rela (ebl, ehdr, scn, shdr); else if (shdr->sh_type == SHT_RELR) handle_relocs_relr (ebl, mod, scn, shdr); } } } /* Handle a relocation section. */ static void handle_relocs_rel (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_REL, 1, EV_CURRENT); int nentries = shdr->sh_size / sh_entsize; /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return; /* Get the symbol table information. */ Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link); GElf_Shdr symshdr_mem; GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem); Elf_Data *symdata = elf_getdata (symscn, NULL); /* Get the section header of the section the relocations are for. */ GElf_Shdr destshdr_mem; GElf_Shdr *destshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_info), &destshdr_mem); if (unlikely (symshdr == NULL || symdata == NULL || destshdr == NULL)) { printf (_("\nInvalid symbol table at offset %#0" PRIx64 "\n"), shdr->sh_offset); return; } /* Search for the optional extended section index table if there are more than 64k sections. */ Elf_Data *xndxdata = NULL; int xndxscnidx = shnum >= SHN_LORESERVE ? elf_scnshndx (symscn) : 0; if (unlikely (xndxscnidx > 0)) xndxdata = elf_getdata (elf_getscn (ebl->elf, xndxscnidx), NULL); /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); if (shdr->sh_info != 0) printf (ngettext ("\ \nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n", "\ \nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n", nentries), elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), (unsigned int) shdr->sh_info, elf_strptr (ebl->elf, shstrndx, destshdr->sh_name), shdr->sh_offset, nentries); else /* The .rel.dyn section does not refer to a specific section but instead of section index zero. Do not try to print a section name. */ printf (ngettext ("\ \nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n", "\ \nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n", nentries), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_offset, nentries); fputs (class == ELFCLASS32 ? _("\ Offset Type Value Name\n") : _("\ Offset Type Value Name\n"), stdout); int is_statically_linked = 0; for (int cnt = 0; cnt < nentries; ++cnt) { GElf_Rel relmem; GElf_Rel *rel = gelf_getrel (data, cnt, &relmem); if (likely (rel != NULL)) { char buf[128]; GElf_Sym symmem; Elf32_Word xndx; GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata, GELF_R_SYM (rel->r_info), &symmem, &xndx); if (unlikely (sym == NULL)) { /* As a special case we have to handle relocations in static executables. This only happens for IRELATIVE relocations (so far). There is no symbol table. */ if (is_statically_linked == 0) { /* Find the program header and look for a PT_INTERP entry. */ is_statically_linked = -1; if (ehdr->e_type == ET_EXEC) { is_statically_linked = 1; for (size_t inner = 0; inner < phnum; ++inner) { GElf_Phdr phdr_mem; GElf_Phdr *phdr = gelf_getphdr (ebl->elf, inner, &phdr_mem); if (phdr != NULL && phdr->p_type == PT_INTERP) { is_statically_linked = -1; break; } } } } if (is_statically_linked > 0 && shdr->sh_link == 0) printf ("\ %#0*" PRIx64 " %-20s %*s %s\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), class == ELFCLASS32 ? 10 : 18, "", elf_strptr (ebl->elf, shstrndx, destshdr->sh_name)); else printf (" %#0*" PRIx64 " %-20s <%s %ld>\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), _("INVALID SYMBOL"), (long int) GELF_R_SYM (rel->r_info)); } else if (GELF_ST_TYPE (sym->st_info) != STT_SECTION && !(GELF_ST_TYPE (sym->st_info) == STT_NOTYPE && GELF_ST_BIND (sym->st_info) == STB_LOCAL && sym->st_shndx != SHN_UNDEF && sym->st_value == 0)) // local start section label printf (" %#0*" PRIx64 " %-20s %#0*" PRIx64 " %s\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, likely (ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), class == ELFCLASS32 ? 10 : 18, sym->st_value, elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name)); else { /* This is a relocation against a STT_SECTION symbol or a local start section label for which we print section name. */ GElf_Shdr secshdr_mem; GElf_Shdr *secshdr; secshdr = gelf_getshdr (elf_getscn (ebl->elf, sym->st_shndx == SHN_XINDEX ? xndx : sym->st_shndx), &secshdr_mem); if (unlikely (secshdr == NULL)) printf (" %#0*" PRIx64 " %-20s <%s %ld>\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), _("INVALID SECTION"), (long int) (sym->st_shndx == SHN_XINDEX ? xndx : sym->st_shndx)); else printf (" %#0*" PRIx64 " %-20s %#0*" PRIx64 " %s\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), class == ELFCLASS32 ? 10 : 18, sym->st_value, elf_strptr (ebl->elf, shstrndx, secshdr->sh_name)); } } } } /* Handle a relocation section. */ static void handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_RELA, 1, EV_CURRENT); int nentries = shdr->sh_size / sh_entsize; /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return; /* Get the symbol table information. */ Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link); GElf_Shdr symshdr_mem; GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem); Elf_Data *symdata = elf_getdata (symscn, NULL); /* Get the section header of the section the relocations are for. */ GElf_Shdr destshdr_mem; GElf_Shdr *destshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_info), &destshdr_mem); if (unlikely (symshdr == NULL || symdata == NULL || destshdr == NULL)) { printf (_("\nInvalid symbol table at offset %#0" PRIx64 "\n"), shdr->sh_offset); return; } /* Search for the optional extended section index table if there are more than 64k sections. */ Elf_Data *xndxdata = NULL; int xndxscnidx = shnum >= SHN_LORESERVE ? elf_scnshndx (symscn) : 0; if (unlikely (xndxscnidx > 0)) xndxdata = elf_getdata (elf_getscn (ebl->elf, xndxscnidx), NULL); /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); if (shdr->sh_info != 0) printf (ngettext ("\ \nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n", "\ \nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n", nentries), elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), (unsigned int) shdr->sh_info, elf_strptr (ebl->elf, shstrndx, destshdr->sh_name), shdr->sh_offset, nentries); else /* The .rela.dyn section does not refer to a specific section but instead of section index zero. Do not try to print a section name. */ printf (ngettext ("\ \nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n", "\ \nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n", nentries), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_offset, nentries); fputs (class == ELFCLASS32 ? _("\ Offset Type Value Addend Name\n") : _("\ Offset Type Value Addend Name\n"), stdout); int is_statically_linked = 0; for (int cnt = 0; cnt < nentries; ++cnt) { GElf_Rela relmem; GElf_Rela *rel = gelf_getrela (data, cnt, &relmem); if (likely (rel != NULL)) { char buf[64]; GElf_Sym symmem; Elf32_Word xndx; GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata, GELF_R_SYM (rel->r_info), &symmem, &xndx); if (unlikely (sym == NULL)) { /* As a special case we have to handle relocations in static executables. This only happens for IRELATIVE relocations (so far). There is no symbol table. */ if (is_statically_linked == 0) { /* Find the program header and look for a PT_INTERP entry. */ is_statically_linked = -1; if (ehdr->e_type == ET_EXEC) { is_statically_linked = 1; for (size_t inner = 0; inner < phnum; ++inner) { GElf_Phdr phdr_mem; GElf_Phdr *phdr = gelf_getphdr (ebl->elf, inner, &phdr_mem); if (phdr != NULL && phdr->p_type == PT_INTERP) { is_statically_linked = -1; break; } } } } if (is_statically_linked > 0 && shdr->sh_link == 0) printf ("\ %#0*" PRIx64 " %-15s %*s %#6" PRIx64 " %s\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), class == ELFCLASS32 ? 10 : 18, "", rel->r_addend, elf_strptr (ebl->elf, shstrndx, destshdr->sh_name)); else printf (" %#0*" PRIx64 " %-15s <%s %ld>\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), _("INVALID SYMBOL"), (long int) GELF_R_SYM (rel->r_info)); } else if (GELF_ST_TYPE (sym->st_info) != STT_SECTION && !(GELF_ST_TYPE (sym->st_info) == STT_NOTYPE && GELF_ST_BIND (sym->st_info) == STB_LOCAL && sym->st_shndx != SHN_UNDEF && sym->st_value == 0)) // local start section label printf ("\ %#0*" PRIx64 " %-15s %#0*" PRIx64 " %+6" PRId64 " %s\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, likely (ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), class == ELFCLASS32 ? 10 : 18, sym->st_value, rel->r_addend, elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name)); else { /* This is a relocation against a STT_SECTION symbol or a local start section label for which we print section name. */ GElf_Shdr secshdr_mem; GElf_Shdr *secshdr; secshdr = gelf_getshdr (elf_getscn (ebl->elf, sym->st_shndx == SHN_XINDEX ? xndx : sym->st_shndx), &secshdr_mem); if (unlikely (secshdr == NULL)) printf (" %#0*" PRIx64 " %-15s <%s %ld>\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), _("INVALID SECTION"), (long int) (sym->st_shndx == SHN_XINDEX ? xndx : sym->st_shndx)); else printf ("\ %#0*" PRIx64 " %-15s %#0*" PRIx64 " %+6" PRId64 " %s\n", class == ELFCLASS32 ? 10 : 18, rel->r_offset, ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info)) /* Avoid the leading R_ which isn't carrying any information. */ ? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info), buf, sizeof (buf)) + 2 : _("<INVALID RELOC>"), class == ELFCLASS32 ? 10 : 18, sym->st_value, rel->r_addend, elf_strptr (ebl->elf, shstrndx, secshdr->sh_name)); } } } } /* Handle a relocation section. */ static void handle_relocs_relr (Ebl *ebl, Dwfl_Module *mod, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_RELR, 1, EV_CURRENT); int nentries = shdr->sh_size / sh_entsize; /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); /* A .relr.dyn section does not refer to a specific section. */ printf (ngettext ("\ \nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n", "\ \nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n", nentries), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_offset, nentries); if (class == ELFCLASS32) { uint32_t base = 0; for (int cnt = 0; cnt < nentries; ++cnt) { Elf32_Word *words = data->d_buf; Elf32_Word entry = words[cnt]; /* Just the raw entries? */ if (print_unresolved_addresses) printf (" %#010" PRIx32 "%s\n", entry, (entry & 1) == 0 ? " *" : ""); else { /* A real address, also sets base. */ if ((entry & 1) == 0) { printf (" "); print_dwarf_addr (mod, 4, entry, entry, stdout); printf (" *\n"); base = entry + 4; } else { /* Untangle address from base and bits. */ uint32_t addr; for (addr = base; (entry >>= 1) != 0; addr += 4) if ((entry & 1) != 0) { printf (" "); print_dwarf_addr (mod, 4, addr, addr, stdout); printf ("\n"); } base += 4 * (4 * 8 - 1); } } } } else { uint64_t base = 0; for (int cnt = 0; cnt < nentries; ++cnt) { Elf64_Xword *xwords = data->d_buf; Elf64_Xword entry = xwords[cnt]; /* Just the raw entries? */ if (print_unresolved_addresses) printf (" %#018" PRIx64 "%s\n", entry, (entry & 1) == 0 ? " *" : ""); else { /* A real address, also sets base. */ if ((entry & 1) == 0) { printf (" "); print_dwarf_addr (mod, 8, entry, entry, stdout); printf (" *\n"); base = entry + 8; } else { /* Untangle address from base and bits. */ uint64_t addr; for (addr = base; (entry >>= 1) != 0; addr += 8) if ((entry & 1) != 0) { printf (" "); print_dwarf_addr (mod, 8, addr, addr, stdout); printf ("\n"); } base += 8 * (8 * 8 - 1); } } } } } /* Print the program header. Return true if a symtab is printed, false otherwise. */ static bool print_symtab (Ebl *ebl, int type) { /* Use the dynamic section info to display symbol tables. */ if (use_dynamic_segment && type == SHT_DYNSYM) return handle_dynamic_symtab(ebl); /* Find the symbol table(s). For this we have to search through the section table. */ Elf_Scn *scn = NULL; bool symtab_printed = false; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { /* Handle the section if it is a symbol table. */ GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr != NULL && shdr->sh_type == (GElf_Word) type) { if (symbol_table_section != NULL) { /* Get the section header string table index. */ size_t shstrndx; const char *sname; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); sname = elf_strptr (ebl->elf, shstrndx, shdr->sh_name); if (sname == NULL || strcmp (sname, symbol_table_section) != 0) continue; } if ((shdr->sh_flags & SHF_COMPRESSED) != 0) { if (elf_compress (scn, 0, 0) < 0) printf ("WARNING: %s [%zd]\n", _("Couldn't uncompress section"), elf_ndxscn (scn)); shdr = gelf_getshdr (scn, &shdr_mem); if (unlikely (shdr == NULL)) error_exit (0, _("cannot get section [%zd] header: %s"), elf_ndxscn (scn), elf_errmsg (-1)); } symtab_printed = handle_symtab (ebl, scn, shdr); } } return symtab_printed; } static void process_symtab (Ebl *ebl, unsigned int nsyms, Elf64_Word idx, Elf32_Word verneed_stridx, Elf32_Word verdef_stridx, Elf_Data *symdata, Elf_Data *versym_data, Elf_Data *symstr_data, Elf_Data *verneed_data, Elf_Data *verdef_data, Elf_Data *xndx_data) { for (unsigned int cnt = 0; cnt < nsyms; ++cnt) { char typebuf[64]; char bindbuf[64]; char scnbuf[64]; const char *sym_name; Elf32_Word xndx; GElf_Sym sym_mem; GElf_Sym *sym = gelf_getsymshndx (symdata, xndx_data, cnt, &sym_mem, &xndx); if (unlikely (sym == NULL)) continue; /* Determine the real section index. */ if (likely (sym->st_shndx != SHN_XINDEX)) xndx = sym->st_shndx; if (use_dynamic_segment == true) { if (symstr_data != NULL && validate_str (symstr_data->d_buf, sym->st_name, symstr_data->d_size)) sym_name = (char *)symstr_data->d_buf + sym->st_name; else sym_name = NULL; } else sym_name = elf_strptr (ebl->elf, idx, sym->st_name); if (sym_name == NULL) sym_name = "???"; printf (_ ("\ %5u: %0*" PRIx64 " %6" PRId64 " %-7s %-6s %-9s %6s %s"), cnt, gelf_getclass (ebl->elf) == ELFCLASS32 ? 8 : 16, sym->st_value, sym->st_size, ebl_symbol_type_name (ebl, GELF_ST_TYPE (sym->st_info), typebuf, sizeof (typebuf)), ebl_symbol_binding_name (ebl, GELF_ST_BIND (sym->st_info), bindbuf, sizeof (bindbuf)), get_visibility_type (GELF_ST_VISIBILITY (sym->st_other)), ebl_section_name (ebl, sym->st_shndx, xndx, scnbuf, sizeof (scnbuf), NULL, shnum), sym_name); if (versym_data != NULL) { /* Get the version information. */ GElf_Versym versym_mem; GElf_Versym *versym = gelf_getversym (versym_data, cnt, &versym_mem); if (versym != NULL && ((*versym & 0x8000) != 0 || *versym > 1)) { bool is_nobits = false; bool check_def = xndx != SHN_UNDEF; if (xndx < SHN_LORESERVE || sym->st_shndx == SHN_XINDEX) { GElf_Shdr symshdr_mem; GElf_Shdr *symshdr = gelf_getshdr ( elf_getscn (ebl->elf, xndx), &symshdr_mem); is_nobits = (symshdr != NULL && symshdr->sh_type == SHT_NOBITS); } if (is_nobits || !check_def) { /* We must test both. */ GElf_Vernaux vernaux_mem; GElf_Vernaux *vernaux = NULL; size_t vn_offset = 0; GElf_Verneed verneed_mem; GElf_Verneed *verneed = gelf_getverneed (verneed_data, 0, &verneed_mem); while (verneed != NULL) { size_t vna_offset = vn_offset; vernaux = gelf_getvernaux (verneed_data, vna_offset += verneed->vn_aux, &vernaux_mem); while (vernaux != NULL && vernaux->vna_other != *versym && vernaux->vna_next != 0 && (verneed_data->d_size - vna_offset >= vernaux->vna_next)) { /* Update the offset. */ vna_offset += vernaux->vna_next; vernaux = (vernaux->vna_next == 0 ? NULL : gelf_getvernaux (verneed_data, vna_offset, &vernaux_mem)); } /* Check whether we found the version. */ if (vernaux != NULL && vernaux->vna_other == *versym) /* Found it. */ break; if (verneed_data->d_size - vn_offset < verneed->vn_next) break; vn_offset += verneed->vn_next; verneed = (verneed->vn_next == 0 ? NULL : gelf_getverneed (verneed_data, vn_offset, &verneed_mem)); } if (vernaux != NULL && vernaux->vna_other == *versym) { printf ("@%s (%u)", use_dynamic_segment == true ? (char *)symstr_data->d_buf + vernaux->vna_name : elf_strptr (ebl->elf, verneed_stridx, vernaux->vna_name), (unsigned int)vernaux->vna_other); check_def = 0; } else if (unlikely (!is_nobits)) error (0, 0, _ ("bad dynamic symbol")); else check_def = 1; } if (check_def && *versym != 0x8001) { /* We must test both. */ size_t vd_offset = 0; GElf_Verdef verdef_mem; GElf_Verdef *verdef = gelf_getverdef (verdef_data, 0, &verdef_mem); while (verdef != NULL) { if (verdef->vd_ndx == (*versym & 0x7fff)) /* Found the definition. */ break; if (verdef_data->d_size - vd_offset < verdef->vd_next) break; vd_offset += verdef->vd_next; verdef = (verdef->vd_next == 0 ? NULL : gelf_getverdef (verdef_data, vd_offset, &verdef_mem)); } if (verdef != NULL) { GElf_Verdaux verdaux_mem; GElf_Verdaux *verdaux = gelf_getverdaux ( verdef_data, vd_offset + verdef->vd_aux, &verdaux_mem); if (verdaux != NULL) printf ((*versym & 0x8000) ? "@%s" : "@@%s", use_dynamic_segment == true ? (char *)symstr_data->d_buf + verdaux->vda_name : elf_strptr (ebl->elf, verdef_stridx, verdaux->vda_name)); } } } } putchar ('\n'); } } static bool handle_symtab (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) { Elf_Data *versym_data = NULL; Elf_Data *verneed_data = NULL; Elf_Data *verdef_data = NULL; Elf_Data *xndx_data = NULL; int class = gelf_getclass (ebl->elf); Elf32_Word verneed_stridx = 0; Elf32_Word verdef_stridx = 0; /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return false; /* Find out whether we have other sections we might need. */ Elf_Scn *runscn = NULL; while ((runscn = elf_nextscn (ebl->elf, runscn)) != NULL) { GElf_Shdr runshdr_mem; GElf_Shdr *runshdr = gelf_getshdr (runscn, &runshdr_mem); if (likely (runshdr != NULL)) { if (runshdr->sh_type == SHT_GNU_versym && runshdr->sh_link == elf_ndxscn (scn)) /* Bingo, found the version information. Now get the data. */ versym_data = elf_getdata (runscn, NULL); else if (runshdr->sh_type == SHT_GNU_verneed) { /* This is the information about the needed versions. */ verneed_data = elf_getdata (runscn, NULL); verneed_stridx = runshdr->sh_link; } else if (runshdr->sh_type == SHT_GNU_verdef) { /* This is the information about the defined versions. */ verdef_data = elf_getdata (runscn, NULL); verdef_stridx = runshdr->sh_link; } else if (runshdr->sh_type == SHT_SYMTAB_SHNDX && runshdr->sh_link == elf_ndxscn (scn)) /* Extended section index. */ xndx_data = elf_getdata (runscn, NULL); } } /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); GElf_Shdr glink_mem; GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); if (glink == NULL) error_exit (0, _("invalid sh_link value in section %zu"), elf_ndxscn (scn)); /* Now we can compute the number of entries in the section. */ unsigned int nsyms = data->d_size / (class == ELFCLASS32 ? sizeof (Elf32_Sym) : sizeof (Elf64_Sym)); printf (ngettext ("\nSymbol table [%2u] '%s' contains %u entry:\n", "\nSymbol table [%2u] '%s' contains %u entries:\n", nsyms), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), nsyms); printf (ngettext (" %lu local symbol String table: [%2u] '%s'\n", " %lu local symbols String table: [%2u] '%s'\n", shdr->sh_info), (unsigned long int) shdr->sh_info, (unsigned int) shdr->sh_link, elf_strptr (ebl->elf, shstrndx, glink->sh_name)); fputs (class == ELFCLASS32 ? _("\ Num: Value Size Type Bind Vis Ndx Name\n") : _("\ Num: Value Size Type Bind Vis Ndx Name\n"), stdout); process_symtab(ebl, nsyms, shdr->sh_link, verneed_stridx, verdef_stridx, data, versym_data, NULL, verneed_data, verdef_data, xndx_data); return true; } static bool handle_dynamic_symtab (Ebl *ebl) { GElf_Phdr phdr_mem; GElf_Phdr *phdr = NULL; /* phnum is a static variable which was already fetched in function process_elf_file. */ for (size_t i = 0; i < phnum; ++i) { phdr = gelf_getphdr (ebl->elf, i, &phdr_mem); if (phdr == NULL || phdr->p_type == PT_DYNAMIC) break; } if (phdr == NULL) return false; GElf_Addr addrs[i_max] = { 0, }; GElf_Off offs[i_max] = { 0, }; get_dynscn_addrs (ebl->elf, phdr, addrs); find_offsets (ebl->elf, 0, i_max, addrs, offs); size_t syments = 0; GElf_Ehdr ehdr_mem; GElf_Ehdr *ehdr = gelf_getehdr (ebl->elf, &ehdr_mem); if (offs[i_hash] != 0) { /* In the original format, .hash says the size of .dynsym. */ size_t entsz = SH_ENTSIZE_HASH (ehdr); Elf_Data *data = elf_getdata_rawchunk (ebl->elf, offs[i_hash] + entsz, entsz, (entsz == 4 ? ELF_T_WORD : ELF_T_XWORD)); if (data != NULL) syments = (entsz == 4 ? *(const GElf_Word *)data->d_buf : *(const GElf_Xword *)data->d_buf); } if (offs[i_gnu_hash] != 0 && syments == 0) { /* In the new format, we can derive it with some work. */ const struct { Elf32_Word nbuckets; Elf32_Word symndx; Elf32_Word maskwords; Elf32_Word shift2; } * header; Elf_Data *data = elf_getdata_rawchunk (ebl->elf, offs[i_gnu_hash], sizeof *header, ELF_T_WORD); if (data != NULL) { header = data->d_buf; Elf32_Word nbuckets = header->nbuckets; Elf32_Word symndx = header->symndx; GElf_Off buckets_at = (offs[i_gnu_hash] + sizeof *header + (gelf_getclass (ebl->elf) * sizeof (Elf32_Word) * header->maskwords)); // elf_getdata_rawchunk takes a size_t, make sure it // doesn't overflow. #if SIZE_MAX <= UINT32_MAX if (nbuckets > SIZE_MAX / sizeof (Elf32_Word)) data = NULL; else #endif data = elf_getdata_rawchunk (ebl->elf, buckets_at, nbuckets * sizeof (Elf32_Word), ELF_T_WORD); if (data != NULL && symndx < nbuckets) { const Elf32_Word *const buckets = data->d_buf; Elf32_Word maxndx = symndx; for (Elf32_Word bucket = 0; bucket < nbuckets; ++bucket) if (buckets[bucket] > maxndx) maxndx = buckets[bucket]; GElf_Off hasharr_at = (buckets_at + nbuckets * sizeof (Elf32_Word)); hasharr_at += (maxndx - symndx) * sizeof (Elf32_Word); do { data = elf_getdata_rawchunk ( ebl->elf, hasharr_at, sizeof (Elf32_Word), ELF_T_WORD); if (data != NULL && (*(const Elf32_Word *)data->d_buf & 1u)) { syments = maxndx + 1; break; } ++maxndx; hasharr_at += sizeof (Elf32_Word); } while (data != NULL); } } } if (offs[i_strtab] > offs[i_symtab] && syments == 0) syments = ((offs[i_strtab] - offs[i_symtab]) / gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT)); if (syments <= 0 || offs[i_strtab] == 0 || offs[i_symtab] == 0) { error_exit (0, _ ("Dynamic symbol information is not available for " "displaying symbols.")); } /* All the data chunk initializaion. */ Elf_Data *symdata = NULL; Elf_Data *symstrdata = NULL; Elf_Data *versym_data = NULL; Elf_Data *verdef_data = NULL; Elf_Data *verneed_data = NULL; if (offs[i_symtab] != 0) symdata = elf_getdata_rawchunk ( ebl->elf, offs[i_symtab], gelf_fsize (ebl->elf, ELF_T_SYM, syments, EV_CURRENT), ELF_T_SYM); if (offs[i_strtab] != 0 && addrs[i_strsz] != 0) symstrdata = elf_getdata_rawchunk (ebl->elf, offs[i_strtab], addrs[i_strsz], ELF_T_BYTE); if (offs[i_versym] != 0) versym_data = elf_getdata_rawchunk ( ebl->elf, offs[i_versym], syments * sizeof (Elf64_Half), ELF_T_HALF); /* Get the verneed_data without vernaux. */ if (offs[i_verneed] != 0 && addrs[i_verneednum] != 0) { verneed_data = elf_getdata_rawchunk ( ebl->elf, offs[i_verneed], addrs[i_verneednum] * sizeof (Elf64_Verneed), ELF_T_VNEED); if (verneed_data->d_size < sizeof (GElf_Verneed)) error_exit (0, _("malformed SHT_GNU_verneed data")); } size_t vernauxnum = 0; size_t vn_next_offset = 0; if (verneed_data != NULL && verneed_data->d_buf != NULL) for (size_t i = 0; i < addrs[i_verneednum]; i++) { if (vn_next_offset > (verneed_data->d_size - sizeof (GElf_Verneed))) error_exit (0, _("invalid SHT_GNU_verneed data")); GElf_Verneed *verneed = (GElf_Verneed *)(verneed_data->d_buf + vn_next_offset); vernauxnum += verneed->vn_cnt; vn_next_offset += verneed->vn_next; } /* Update the verneed_data to include the vernaux. */ if (offs[i_verneed] != 0 && addrs[i_verneednum] != 0) verneed_data = elf_getdata_rawchunk ( ebl->elf, offs[i_verneed], (addrs[i_verneednum] + vernauxnum) * sizeof (GElf_Verneed), ELF_T_VNEED); /* Get the verdef_data without verdaux. */ if (offs[i_verdef] != 0 && addrs[i_verdefnum] != 0) { verdef_data = elf_getdata_rawchunk ( ebl->elf, offs[i_verdef], addrs[i_verdefnum] * sizeof (Elf64_Verdef), ELF_T_VDEF); if (verdef_data->d_size < sizeof (GElf_Verdef)) error_exit (0, _("malformed SHT_GNU_verdef data")); } size_t verdauxnum = 0; size_t vd_next_offset = 0; if (verdef_data != NULL && verdef_data->d_buf != NULL) for (size_t i = 0; i < addrs[i_verdefnum]; i++) { if (vd_next_offset > (verdef_data->d_size - sizeof (GElf_Verdef))) error_exit (0, _("invalid SHT_GNU_verdef data")); GElf_Verdef *verdef = (GElf_Verdef *)(verdef_data->d_buf + vd_next_offset); verdauxnum += verdef->vd_cnt; vd_next_offset += verdef->vd_next; } /* Update the verdef_data to include the verdaux. */ if (offs[i_verdef] != 0 && addrs[i_verdefnum] != 0) verdef_data = elf_getdata_rawchunk ( ebl->elf, offs[i_verdef], (addrs[i_verdefnum] + verdauxnum) * sizeof (GElf_Verdef), ELF_T_VDEF); unsigned int nsyms = (unsigned int)syments; process_symtab (ebl, nsyms, 0, 0, 0, symdata, versym_data, symstrdata, verneed_data, verdef_data, NULL); return true; } /* Print version information. */ static void print_verinfo (Ebl *ebl) { /* Find the version information sections. For this we have to search through the section table. */ Elf_Scn *scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { /* Handle the section if it is part of the versioning handling. */ GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (likely (shdr != NULL)) { if (shdr->sh_type == SHT_GNU_verneed) handle_verneed (ebl, scn, shdr); else if (shdr->sh_type == SHT_GNU_verdef) handle_verdef (ebl, scn, shdr); else if (shdr->sh_type == SHT_GNU_versym) handle_versym (ebl, scn, shdr); } } } static const char * get_ver_flags (unsigned int flags) { static char buf[32]; char *endp; if (flags == 0) return _("none"); if (flags & VER_FLG_BASE) endp = stpcpy (buf, "BASE "); else endp = buf; if (flags & VER_FLG_WEAK) { if (endp != buf) endp = stpcpy (endp, "| "); endp = stpcpy (endp, "WEAK "); } if (unlikely (flags & ~(VER_FLG_BASE | VER_FLG_WEAK))) { strncpy (endp, _("| <unknown>"), buf + sizeof (buf) - endp); buf[sizeof (buf) - 1] = '\0'; } return buf; } static void handle_verneed (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); GElf_Shdr glink_mem; GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); if (glink == NULL) error_exit (0, _("invalid sh_link value in section %zu"), elf_ndxscn (scn)); printf (ngettext ("\ \nVersion needs section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ \nVersion needs section [%2u] '%s' contains %d entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", shdr->sh_info), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_info, class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, elf_strptr (ebl->elf, shstrndx, glink->sh_name)); unsigned int offset = 0; for (unsigned int cnt = shdr->sh_info; cnt > 0; cnt--) { /* Get the data at the next offset. */ GElf_Verneed needmem; GElf_Verneed *need = gelf_getverneed (data, offset, &needmem); if (unlikely (need == NULL)) break; printf (_(" %#06x: Version: %hu File: %s Cnt: %hu\n"), offset, (unsigned short int) need->vn_version, elf_strptr (ebl->elf, shdr->sh_link, need->vn_file), (unsigned short int) need->vn_cnt); unsigned int auxoffset = offset + need->vn_aux; for (unsigned int cnt2 = need->vn_cnt; cnt2 > 0; cnt2--) { GElf_Vernaux auxmem; GElf_Vernaux *aux = gelf_getvernaux (data, auxoffset, &auxmem); if (unlikely (aux == NULL)) break; printf (_(" %#06x: Name: %s Flags: %s Version: %hu\n"), auxoffset, elf_strptr (ebl->elf, shdr->sh_link, aux->vna_name), get_ver_flags (aux->vna_flags), (unsigned short int) aux->vna_other); if (aux->vna_next == 0) break; auxoffset += aux->vna_next; } /* Find the next offset. */ if (need->vn_next == 0) break; offset += need->vn_next; } } static void handle_verdef (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) { /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); GElf_Shdr glink_mem; GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); if (glink == NULL) error_exit (0, _("invalid sh_link value in section %zu"), elf_ndxscn (scn)); int class = gelf_getclass (ebl->elf); printf (ngettext ("\ \nVersion definition section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ \nVersion definition section [%2u] '%s' contains %d entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", shdr->sh_info), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_info, class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, elf_strptr (ebl->elf, shstrndx, glink->sh_name)); unsigned int offset = 0; for (unsigned int cnt = shdr->sh_info; cnt > 0; cnt--) { /* Get the data at the next offset. */ GElf_Verdef defmem; GElf_Verdef *def = gelf_getverdef (data, offset, &defmem); if (unlikely (def == NULL)) break; unsigned int auxoffset = offset + def->vd_aux; GElf_Verdaux auxmem; GElf_Verdaux *aux = gelf_getverdaux (data, auxoffset, &auxmem); if (unlikely (aux == NULL)) break; printf (_("\ %#06x: Version: %hd Flags: %s Index: %hd Cnt: %hd Name: %s\n"), offset, def->vd_version, get_ver_flags (def->vd_flags), def->vd_ndx, def->vd_cnt, elf_strptr (ebl->elf, shdr->sh_link, aux->vda_name)); auxoffset += aux->vda_next; for (unsigned int cnt2 = 1; cnt2 < def->vd_cnt; ++cnt2) { aux = gelf_getverdaux (data, auxoffset, &auxmem); if (unlikely (aux == NULL)) break; printf (_(" %#06x: Parent %d: %s\n"), auxoffset, cnt2, elf_strptr (ebl->elf, shdr->sh_link, aux->vda_name)); if (aux->vda_next == 0) break; auxoffset += aux->vda_next; } /* Find the next offset. */ if (def->vd_next == 0) break; offset += def->vd_next; } } static void handle_versym (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr) { int class = gelf_getclass (ebl->elf); const char **vername; const char **filename; /* Get the data of the section. */ Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); /* We have to find the version definition section and extract the version names. */ Elf_Scn *defscn = NULL; Elf_Scn *needscn = NULL; Elf_Scn *verscn = NULL; while ((verscn = elf_nextscn (ebl->elf, verscn)) != NULL) { GElf_Shdr vershdr_mem; GElf_Shdr *vershdr = gelf_getshdr (verscn, &vershdr_mem); if (likely (vershdr != NULL)) { if (vershdr->sh_type == SHT_GNU_verdef) defscn = verscn; else if (vershdr->sh_type == SHT_GNU_verneed) needscn = verscn; } } size_t nvername; if (defscn != NULL || needscn != NULL) { /* We have a version information (better should have). Now get the version names. First find the maximum version number. */ nvername = 0; if (defscn != NULL) { /* Run through the version definitions and find the highest index. */ unsigned int offset = 0; Elf_Data *defdata; GElf_Shdr defshdrmem; GElf_Shdr *defshdr; defdata = elf_getdata (defscn, NULL); if (unlikely (defdata == NULL)) return; defshdr = gelf_getshdr (defscn, &defshdrmem); if (unlikely (defshdr == NULL)) return; for (unsigned int cnt = 0; cnt < defshdr->sh_info; ++cnt) { GElf_Verdef defmem; GElf_Verdef *def; /* Get the data at the next offset. */ def = gelf_getverdef (defdata, offset, &defmem); if (unlikely (def == NULL)) break; nvername = MAX (nvername, (size_t) (def->vd_ndx & 0x7fff)); if (def->vd_next == 0) break; offset += def->vd_next; } } if (needscn != NULL) { unsigned int offset = 0; Elf_Data *needdata; GElf_Shdr needshdrmem; GElf_Shdr *needshdr; needdata = elf_getdata (needscn, NULL); if (unlikely (needdata == NULL)) return; needshdr = gelf_getshdr (needscn, &needshdrmem); if (unlikely (needshdr == NULL)) return; for (unsigned int cnt = 0; cnt < needshdr->sh_info; ++cnt) { GElf_Verneed needmem; GElf_Verneed *need; unsigned int auxoffset; int cnt2; /* Get the data at the next offset. */ need = gelf_getverneed (needdata, offset, &needmem); if (unlikely (need == NULL)) break; /* Run through the auxiliary entries. */ auxoffset = offset + need->vn_aux; for (cnt2 = need->vn_cnt; --cnt2 >= 0; ) { GElf_Vernaux auxmem; GElf_Vernaux *aux; aux = gelf_getvernaux (needdata, auxoffset, &auxmem); if (unlikely (aux == NULL)) break; nvername = MAX (nvername, (size_t) (aux->vna_other & 0x7fff)); if (aux->vna_next == 0) break; auxoffset += aux->vna_next; } if (need->vn_next == 0) break; offset += need->vn_next; } } /* This is the number of versions we know about. */ ++nvername; /* Allocate the array. */ vername = (const char **) alloca (nvername * sizeof (const char *)); memset(vername, 0, nvername * sizeof (const char *)); filename = (const char **) alloca (nvername * sizeof (const char *)); memset(filename, 0, nvername * sizeof (const char *)); /* Run through the data structures again and collect the strings. */ if (defscn != NULL) { /* Run through the version definitions and find the highest index. */ unsigned int offset = 0; Elf_Data *defdata; GElf_Shdr defshdrmem; GElf_Shdr *defshdr; defdata = elf_getdata (defscn, NULL); if (unlikely (defdata == NULL)) return; defshdr = gelf_getshdr (defscn, &defshdrmem); if (unlikely (defshdr == NULL)) return; for (unsigned int cnt = 0; cnt < defshdr->sh_info; ++cnt) { /* Get the data at the next offset. */ GElf_Verdef defmem; GElf_Verdef *def = gelf_getverdef (defdata, offset, &defmem); if (unlikely (def == NULL)) break; GElf_Verdaux auxmem; GElf_Verdaux *aux = gelf_getverdaux (defdata, offset + def->vd_aux, &auxmem); if (unlikely (aux == NULL)) break; vername[def->vd_ndx & 0x7fff] = elf_strptr (ebl->elf, defshdr->sh_link, aux->vda_name); filename[def->vd_ndx & 0x7fff] = NULL; if (def->vd_next == 0) break; offset += def->vd_next; } } if (needscn != NULL) { unsigned int offset = 0; Elf_Data *needdata = elf_getdata (needscn, NULL); GElf_Shdr needshdrmem; GElf_Shdr *needshdr = gelf_getshdr (needscn, &needshdrmem); if (unlikely (needdata == NULL || needshdr == NULL)) return; for (unsigned int cnt = 0; cnt < needshdr->sh_info; ++cnt) { /* Get the data at the next offset. */ GElf_Verneed needmem; GElf_Verneed *need = gelf_getverneed (needdata, offset, &needmem); if (unlikely (need == NULL)) break; /* Run through the auxiliary entries. */ unsigned int auxoffset = offset + need->vn_aux; for (int cnt2 = need->vn_cnt; --cnt2 >= 0; ) { GElf_Vernaux auxmem; GElf_Vernaux *aux = gelf_getvernaux (needdata, auxoffset, &auxmem); if (unlikely (aux == NULL)) break; vername[aux->vna_other & 0x7fff] = elf_strptr (ebl->elf, needshdr->sh_link, aux->vna_name); filename[aux->vna_other & 0x7fff] = elf_strptr (ebl->elf, needshdr->sh_link, need->vn_file); if (aux->vna_next == 0) break; auxoffset += aux->vna_next; } if (need->vn_next == 0) break; offset += need->vn_next; } } } else { vername = NULL; nvername = 1; filename = NULL; } GElf_Shdr glink_mem; GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_HALF, 1, EV_CURRENT); if (glink == NULL) error_exit (0, _("invalid sh_link value in section %zu"), elf_ndxscn (scn)); /* Print the header. */ printf (ngettext ("\ \nVersion symbols section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'", "\ \nVersion symbols section [%2u] '%s' contains %d entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'", shdr->sh_size / sh_entsize), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), (int) (shdr->sh_size / sh_entsize), class == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, elf_strptr (ebl->elf, shstrndx, glink->sh_name)); /* Now we can finally look at the actual contents of this section. */ for (unsigned int cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt) { if (cnt % 2 == 0) printf ("\n %4d:", cnt); GElf_Versym symmem; GElf_Versym *sym = gelf_getversym (data, cnt, &symmem); if (sym == NULL) break; switch (*sym) { ssize_t n; case 0: fputs (_(" 0 *local* "), stdout); break; case 1: fputs (_(" 1 *global* "), stdout); break; default: n = printf ("%4d%c%s", *sym & 0x7fff, *sym & 0x8000 ? 'h' : ' ', (vername != NULL && (unsigned int) (*sym & 0x7fff) < nvername) ? vername[*sym & 0x7fff] : "???"); if ((unsigned int) (*sym & 0x7fff) < nvername && filename != NULL && filename[*sym & 0x7fff] != NULL) n += printf ("(%s)", filename[*sym & 0x7fff]); printf ("%*s", MAX (0, 33 - (int) n), " "); break; } } putchar ('\n'); } static void print_hash_info (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx, uint_fast32_t maxlength, Elf32_Word nbucket, uint_fast32_t nsyms, uint32_t *lengths, const char *extrastr) { uint32_t *counts = xcalloc (maxlength + 1, sizeof (uint32_t)); for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt) ++counts[lengths[cnt]]; GElf_Shdr glink_mem; GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); if (glink == NULL) { error (0, 0, _("invalid sh_link value in section %zu"), elf_ndxscn (scn)); free (counts); return; } printf (ngettext ("\ \nHistogram for bucket list length in section [%2u] '%s' (total of %d bucket):\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", "\ \nHistogram for bucket list length in section [%2u] '%s' (total of %d buckets):\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n", nbucket), (unsigned int) elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), (int) nbucket, gelf_getclass (ebl->elf) == ELFCLASS32 ? 10 : 18, shdr->sh_addr, shdr->sh_offset, (unsigned int) shdr->sh_link, elf_strptr (ebl->elf, shstrndx, glink->sh_name)); if (extrastr != NULL) fputs (extrastr, stdout); if (likely (nbucket > 0)) { uint64_t success = 0; /* xgettext:no-c-format */ fputs (_("\ Length Number % of total Coverage\n"), stdout); printf (_(" 0 %6" PRIu32 " %5.1f%%\n"), counts[0], (counts[0] * 100.0) / nbucket); uint64_t nzero_counts = 0; for (Elf32_Word cnt = 1; cnt <= maxlength; ++cnt) { nzero_counts += counts[cnt] * cnt; printf (_("\ %7d %6" PRIu32 " %5.1f%% %5.1f%%\n"), (int) cnt, counts[cnt], (counts[cnt] * 100.0) / nbucket, (nzero_counts * 100.0) / nsyms); } Elf32_Word acc = 0; for (Elf32_Word cnt = 1; cnt <= maxlength; ++cnt) { acc += cnt; success += counts[cnt] * acc; } if (nzero_counts > 0) printf (_("\ Average number of tests: successful lookup: %f\n\ unsuccessful lookup: %f\n"), (double) success / (double) nzero_counts, (double) nzero_counts / (double) nbucket); } free (counts); } /* This function handles the traditional System V-style hash table format. */ static void handle_sysv_hash (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx) { Elf_Data *data = elf_getdata (scn, NULL); if (unlikely (data == NULL)) { error (0, 0, _("cannot get data for section %d: %s"), (int) elf_ndxscn (scn), elf_errmsg (-1)); return; } if (unlikely (data->d_size < 2 * sizeof (Elf32_Word))) { invalid_data: error (0, 0, _("invalid data in sysv.hash section %d"), (int) elf_ndxscn (scn)); return; } Elf32_Word nbucket = ((Elf32_Word *) data->d_buf)[0]; Elf32_Word nchain = ((Elf32_Word *) data->d_buf)[1]; uint64_t used_buf = (2ULL + nchain + nbucket) * sizeof (Elf32_Word); if (used_buf > data->d_size) goto invalid_data; Elf32_Word *bucket = &((Elf32_Word *) data->d_buf)[2]; Elf32_Word *chain = &((Elf32_Word *) data->d_buf)[2 + nbucket]; uint32_t *lengths = xcalloc (nbucket, sizeof (uint32_t)); uint_fast32_t maxlength = 0; uint_fast32_t nsyms = 0; for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt) { Elf32_Word inner = bucket[cnt]; Elf32_Word chain_len = 0; while (inner > 0 && inner < nchain) { ++nsyms; ++chain_len; if (chain_len > nchain) { error (0, 0, _("invalid chain in sysv.hash section %d"), (int) elf_ndxscn (scn)); free (lengths); return; } if (maxlength < ++lengths[cnt]) ++maxlength; inner = chain[inner]; } } print_hash_info (ebl, scn, shdr, shstrndx, maxlength, nbucket, nsyms, lengths, NULL); free (lengths); } /* This function handles the incorrect, System V-style hash table format some 64-bit architectures use. */ static void handle_sysv_hash64 (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx) { Elf_Data *data = elf_getdata (scn, NULL); if (unlikely (data == NULL)) { error (0, 0, _("cannot get data for section %d: %s"), (int) elf_ndxscn (scn), elf_errmsg (-1)); return; } if (unlikely (data->d_size < 2 * sizeof (Elf64_Xword))) { invalid_data: error (0, 0, _("invalid data in sysv.hash64 section %d"), (int) elf_ndxscn (scn)); return; } Elf64_Xword nbucket = ((Elf64_Xword *) data->d_buf)[0]; Elf64_Xword nchain = ((Elf64_Xword *) data->d_buf)[1]; uint64_t maxwords = data->d_size / sizeof (Elf64_Xword); if (maxwords < 2 || maxwords - 2 < nbucket || maxwords - 2 - nbucket < nchain) goto invalid_data; Elf64_Xword *bucket = &((Elf64_Xword *) data->d_buf)[2]; Elf64_Xword *chain = &((Elf64_Xword *) data->d_buf)[2 + nbucket]; uint32_t *lengths = xcalloc (nbucket, sizeof (uint32_t)); uint_fast32_t maxlength = 0; uint_fast32_t nsyms = 0; for (Elf64_Xword cnt = 0; cnt < nbucket; ++cnt) { Elf64_Xword inner = bucket[cnt]; Elf64_Xword chain_len = 0; while (inner > 0 && inner < nchain) { ++nsyms; ++chain_len; if (chain_len > nchain) { error (0, 0, _("invalid chain in sysv.hash64 section %d"), (int) elf_ndxscn (scn)); free (lengths); return; } if (maxlength < ++lengths[cnt]) ++maxlength; inner = chain[inner]; } } print_hash_info (ebl, scn, shdr, shstrndx, maxlength, nbucket, nsyms, lengths, NULL); free (lengths); } /* This function handles the GNU-style hash table format. */ static void handle_gnu_hash (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx) { uint32_t *lengths = NULL; Elf_Data *data = elf_getdata (scn, NULL); if (unlikely (data == NULL)) { error (0, 0, _("cannot get data for section %d: %s"), (int) elf_ndxscn (scn), elf_errmsg (-1)); return; } if (unlikely (data->d_size < 4 * sizeof (Elf32_Word))) { invalid_data: free (lengths); error (0, 0, _("invalid data in gnu.hash section %d"), (int) elf_ndxscn (scn)); return; } Elf32_Word nbucket = ((Elf32_Word *) data->d_buf)[0]; Elf32_Word symbias = ((Elf32_Word *) data->d_buf)[1]; /* Next comes the size of the bitmap. It's measured in words for the architecture. It's 32 bits for 32 bit archs, and 64 bits for 64 bit archs. There is always a bloom filter present, so zero is an invalid value. */ Elf32_Word bitmask_words = ((Elf32_Word *) data->d_buf)[2]; if (gelf_getclass (ebl->elf) == ELFCLASS64) bitmask_words *= 2; if (bitmask_words == 0) goto invalid_data; Elf32_Word shift = ((Elf32_Word *) data->d_buf)[3]; /* Is there still room for the sym chain? Use uint64_t calculation to prevent 32bit overflow. */ uint64_t used_buf = (4ULL + bitmask_words + nbucket) * sizeof (Elf32_Word); uint32_t max_nsyms = (data->d_size - used_buf) / sizeof (Elf32_Word); if (used_buf > data->d_size) goto invalid_data; lengths = xcalloc (nbucket, sizeof (uint32_t)); Elf32_Word *bitmask = &((Elf32_Word *) data->d_buf)[4]; Elf32_Word *bucket = &((Elf32_Word *) data->d_buf)[4 + bitmask_words]; Elf32_Word *chain = &((Elf32_Word *) data->d_buf)[4 + bitmask_words + nbucket]; /* Compute distribution of chain lengths. */ uint_fast32_t maxlength = 0; uint_fast32_t nsyms = 0; for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt) if (bucket[cnt] != 0) { Elf32_Word inner = bucket[cnt] - symbias; do { ++nsyms; if (maxlength < ++lengths[cnt]) ++maxlength; if (inner >= max_nsyms) goto invalid_data; } while ((chain[inner++] & 1) == 0); } /* Count bits in bitmask. */ uint_fast32_t nbits = 0; for (Elf32_Word cnt = 0; cnt < bitmask_words; ++cnt) { uint_fast32_t word = bitmask[cnt]; word = (word & 0x55555555) + ((word >> 1) & 0x55555555); word = (word & 0x33333333) + ((word >> 2) & 0x33333333); word = (word & 0x0f0f0f0f) + ((word >> 4) & 0x0f0f0f0f); word = (word & 0x00ff00ff) + ((word >> 8) & 0x00ff00ff); nbits += (word & 0x0000ffff) + ((word >> 16) & 0x0000ffff); } char *str = xasprintf (_("\ Symbol Bias: %u\n\ Bitmask Size: %zu bytes %" PRIuFAST32 "%% bits set 2nd hash shift: %u\n"), (unsigned int) symbias, bitmask_words * sizeof (Elf32_Word), ((nbits * 100 + 50) / (uint_fast32_t) (bitmask_words * sizeof (Elf32_Word) * 8)), (unsigned int) shift); print_hash_info (ebl, scn, shdr, shstrndx, maxlength, nbucket, nsyms, lengths, str); free (str); free (lengths); } /* Find the symbol table(s). For this we have to search through the section table. */ static void handle_hash (Ebl *ebl) { /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); Elf_Scn *scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { /* Handle the section if it is a symbol table. */ GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (likely (shdr != NULL)) { if ((shdr->sh_type == SHT_HASH || shdr->sh_type == SHT_GNU_HASH) && (shdr->sh_flags & SHF_COMPRESSED) != 0) { if (elf_compress (scn, 0, 0) < 0) printf ("WARNING: %s [%zd]\n", _("Couldn't uncompress section"), elf_ndxscn (scn)); shdr = gelf_getshdr (scn, &shdr_mem); if (unlikely (shdr == NULL)) error_exit (0, _("cannot get section [%zd] header: %s"), elf_ndxscn (scn), elf_errmsg (-1)); } if (shdr->sh_type == SHT_HASH) { if (ebl_sysvhash_entrysize (ebl) == sizeof (Elf64_Xword)) handle_sysv_hash64 (ebl, scn, shdr, shstrndx); else handle_sysv_hash (ebl, scn, shdr, shstrndx); } else if (shdr->sh_type == SHT_GNU_HASH) handle_gnu_hash (ebl, scn, shdr, shstrndx); } } } static void print_liblist (Ebl *ebl) { /* Find the library list sections. For this we have to search through the section table. */ Elf_Scn *scn = NULL; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr != NULL && shdr->sh_type == SHT_GNU_LIBLIST) { size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_LIB, 1, EV_CURRENT); int nentries = shdr->sh_size / sh_entsize; printf (ngettext ("\ \nLibrary list section [%2zu] '%s' at offset %#0" PRIx64 " contains %d entry:\n", "\ \nLibrary list section [%2zu] '%s' at offset %#0" PRIx64 " contains %d entries:\n", nentries), elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_offset, nentries); Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) return; puts (_("\ Library Time Stamp Checksum Version Flags")); for (int cnt = 0; cnt < nentries; ++cnt) { GElf_Lib lib_mem; GElf_Lib *lib = gelf_getlib (data, cnt, &lib_mem); if (unlikely (lib == NULL)) continue; time_t t = (time_t) lib->l_time_stamp; struct tm *tm = gmtime (&t); if (unlikely (tm == NULL)) continue; printf (" [%2d] %-29s %04u-%02u-%02uT%02u:%02u:%02u %08x %-7u %u\n", cnt, elf_strptr (ebl->elf, shdr->sh_link, lib->l_name), tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, (unsigned int) lib->l_checksum, (unsigned int) lib->l_version, (unsigned int) lib->l_flags); } } } } static inline size_t left (Elf_Data *data, const unsigned char *p) { return (const unsigned char *) data->d_buf + data->d_size - p; } static void print_attributes (Ebl *ebl, const GElf_Ehdr *ehdr) { /* Find the object attributes sections. For this we have to search through the section table. */ Elf_Scn *scn = NULL; /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr == NULL || (shdr->sh_type != SHT_GNU_ATTRIBUTES && (shdr->sh_type != SHT_ARM_ATTRIBUTES || ehdr->e_machine != EM_ARM) && (shdr->sh_type != SHT_CSKY_ATTRIBUTES || ehdr->e_machine != EM_CSKY) && (shdr->sh_type != SHT_RISCV_ATTRIBUTES || ehdr->e_machine != EM_RISCV))) continue; printf (_("\ \nObject attributes section [%2zu] '%s' of %" PRIu64 " bytes at offset %#0" PRIx64 ":\n"), elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_size, shdr->sh_offset); Elf_Data *data = elf_rawdata (scn, NULL); if (unlikely (data == NULL || data->d_size == 0)) return; const unsigned char *p = data->d_buf; /* There is only one 'version', A. */ if (unlikely (*p++ != 'A')) return; fputs (_(" Owner Size\n"), stdout); /* Loop over the sections. */ while (left (data, p) >= 4) { /* Section length. */ uint32_t len; memcpy (&len, p, sizeof len); if (MY_ELFDATA != ehdr->e_ident[EI_DATA]) CONVERT (len); if (unlikely (len > left (data, p))) break; /* Section vendor name. */ const unsigned char *name = p + sizeof len; p += len; unsigned const char *q = memchr (name, '\0', len); if (unlikely (q == NULL)) break; ++q; printf (_(" %-13s %4" PRIu32 "\n"), name, len); bool gnu_vendor = (q - name == sizeof "gnu" && !memcmp (name, "gnu", sizeof "gnu")); /* Loop over subsections. */ if (shdr->sh_type != SHT_GNU_ATTRIBUTES || gnu_vendor) while (q < p) { const unsigned char *const sub = q; unsigned int subsection_tag; get_uleb128 (subsection_tag, q, p); if (unlikely (q >= p)) break; uint32_t subsection_len; if (unlikely (p - sub < (ptrdiff_t) sizeof subsection_len)) break; memcpy (&subsection_len, q, sizeof subsection_len); if (MY_ELFDATA != ehdr->e_ident[EI_DATA]) CONVERT (subsection_len); /* Don't overflow, ptrdiff_t might be 32bits, but signed. */ if (unlikely (subsection_len == 0 || subsection_len >= (uint32_t) PTRDIFF_MAX || p - sub < (ptrdiff_t) subsection_len)) break; const unsigned char *r = q + sizeof subsection_len; q = sub + subsection_len; switch (subsection_tag) { default: /* Unknown subsection, print and skip. */ printf (_(" %-4u %12" PRIu32 "\n"), subsection_tag, subsection_len); break; case 1: /* Tag_File */ printf (_(" File: %11" PRIu32 "\n"), subsection_len); while (r < q) { unsigned int tag; get_uleb128 (tag, r, q); if (unlikely (r >= q)) break; /* GNU style tags have either a uleb128 value, when lowest bit is not set, or a string when the lowest bit is set. "compatibility" (32) is special. It has both a string and a uleb128 value. For non-gnu we assume 6 till 31 only take ints. XXX see arm backend, do we need a separate hook? */ uint64_t value = 0; const char *string = NULL; if (tag == 32 || (tag & 1) == 0 || (! gnu_vendor && (tag > 5 && tag < 32))) { // Note r >= q check above. get_uleb128 (value, r, q); if (r > q) break; } if (tag == 32 || ((tag & 1) != 0 && (gnu_vendor || (! gnu_vendor && tag > 32))) || (! gnu_vendor && tag > 3 && tag < 6)) { string = (const char *) r; r = memchr (r, '\0', q - r); if (r == NULL) break; ++r; } const char *tag_name = NULL; const char *value_name = NULL; ebl_check_object_attribute (ebl, (const char *) name, tag, value, &tag_name, &value_name); if (tag_name != NULL) { if (tag == 32) printf (_(" %s: %" PRId64 ", %s\n"), tag_name, value, string); else if (string == NULL && value_name == NULL) printf (_(" %s: %" PRId64 "\n"), tag_name, value); else printf (_(" %s: %s\n"), tag_name, string ?: value_name); } else { /* For "gnu" vendor 32 "compatibility" has already been handled above. */ assert (tag != 32 || strcmp ((const char *) name, "gnu")); if (string == NULL) printf (_(" %u: %" PRId64 "\n"), tag, value); else printf (_(" %u: %s\n"), tag, string); } } } } } } } /* Returns either the (relocated) data from the Dwarf, or tries to get the "raw" (uncompressed) data from the Elf section. Produces a warning if the data cannot be found (or decompressed). */ static Elf_Data * get_debug_elf_data (Dwarf *dbg, Ebl *ebl, int idx, Elf_Scn *scn) { /* We prefer to get the section data from the Dwarf because that might have been relocated already. Note this is subtly wrong if there are multiple sections with the same .debug name. */ if (dbg->sectiondata[idx] != NULL) return dbg->sectiondata[idx]; GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr != NULL && (shdr->sh_flags & SHF_COMPRESSED) != 0) { if (elf_compress (scn, 0, 0) < 0) { error (0, 0, "%s [%zd] '%s'\n", _("Couldn't uncompress section"), elf_ndxscn (scn), section_name (ebl, shdr)); return NULL; } } Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) error (0, 0, "%s [%zd] '%s': %s\n", _("Couldn't get data from section"), elf_ndxscn (scn), section_name (ebl, shdr), elf_errmsg (-1)); return elf_getdata (scn, NULL); } static void print_dwarf_addr (Dwfl_Module *dwflmod, int address_size, Dwarf_Addr address, Dwarf_Addr raw, FILE *out) { /* See if there is a name we can give for this address. */ GElf_Sym sym; GElf_Off off = 0; const char *name = (print_address_names && ! print_unresolved_addresses) ? dwfl_module_addrinfo (dwflmod, address, &off, &sym, NULL, NULL, NULL) : NULL; const char *scn; if (print_unresolved_addresses) { address = raw; scn = NULL; } else { /* Relativize the address. */ int n = dwfl_module_relocations (dwflmod); int i = n < 1 ? -1 : dwfl_module_relocate_address (dwflmod, &address); /* In an ET_REL file there is a section name to refer to. */ scn = (i < 0 ? NULL : dwfl_module_relocation_info (dwflmod, i, NULL)); } if ((name != NULL ? (off != 0 ? (scn != NULL ? (address_size == 0 ? fprintf (out, "%s+%#" PRIx64 " <%s+%#" PRIx64 ">", scn, address, name, off) : fprintf (out, "%s+%#0*" PRIx64 " <%s+%#" PRIx64 ">", scn, 2 + address_size * 2, address, name, off)) : (address_size == 0 ? fprintf (out, "%#" PRIx64 " <%s+%#" PRIx64 ">", address, name, off) : fprintf (out, "%#0*" PRIx64 " <%s+%#" PRIx64 ">", 2 + address_size * 2, address, name, off))) : (scn != NULL ? (address_size == 0 ? fprintf (out, "%s+%#" PRIx64 " <%s>", scn, address, name) : fprintf (out, "%s+%#0*" PRIx64 " <%s>", scn, 2 + address_size * 2, address, name)) : (address_size == 0 ? fprintf (out, "%#" PRIx64 " <%s>", address, name) : fprintf (out, "%#0*" PRIx64 " <%s>", 2 + address_size * 2, address, name)))) : (scn != NULL ? (address_size == 0 ? fprintf (out, "%s+%#" PRIx64, scn, address) : fprintf (out, "%s+%#0*" PRIx64, scn, 2 + address_size * 2, address)) : (address_size == 0 ? fprintf (out, "%#" PRIx64, address) : fprintf (out, "%#0*" PRIx64, 2 + address_size * 2, address)))) < 0) error_exit (0, _("sprintf failure")); } static const char * dwarf_tag_string (unsigned int tag) { switch (tag) { #define DWARF_ONE_KNOWN_DW_TAG(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_TAG #undef DWARF_ONE_KNOWN_DW_TAG default: return NULL; } } static const char * dwarf_attr_string (unsigned int attrnum) { switch (attrnum) { #define DWARF_ONE_KNOWN_DW_AT(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_AT #undef DWARF_ONE_KNOWN_DW_AT default: return NULL; } } static const char * dwarf_form_string (unsigned int form) { switch (form) { #define DWARF_ONE_KNOWN_DW_FORM(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_FORM #undef DWARF_ONE_KNOWN_DW_FORM default: return NULL; } } static const char * dwarf_lang_string (unsigned int lang) { switch (lang) { #define DWARF_ONE_KNOWN_DW_LANG(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_LANG #undef DWARF_ONE_KNOWN_DW_LANG default: return NULL; } } static const char * dwarf_lname_string (unsigned int lname) { switch (lname) { #define DWARF_ONE_KNOWN_DW_LNAME(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_LNAME #undef DWARF_ONE_KNOWN_DW_LNAME default: return NULL; } } static const char * dwarf_inline_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_INL(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_INL #undef DWARF_ONE_KNOWN_DW_INL }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_encoding_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_ATE(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_ATE #undef DWARF_ONE_KNOWN_DW_ATE }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_access_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_ACCESS(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_ACCESS #undef DWARF_ONE_KNOWN_DW_ACCESS }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_defaulted_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_DEFAULTED(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_DEFAULTED #undef DWARF_ONE_KNOWN_DW_DEFAULTED }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_visibility_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_VIS(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_VIS #undef DWARF_ONE_KNOWN_DW_VIS }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_virtuality_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_VIRTUALITY(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_VIRTUALITY #undef DWARF_ONE_KNOWN_DW_VIRTUALITY }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_identifier_case_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_ID(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_ID #undef DWARF_ONE_KNOWN_DW_ID }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_calling_convention_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_CC(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_CC #undef DWARF_ONE_KNOWN_DW_CC }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_ordering_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_ORD(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_ORD #undef DWARF_ONE_KNOWN_DW_ORD }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_discr_list_string (unsigned int code) { static const char *const known[] = { #define DWARF_ONE_KNOWN_DW_DSC(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_DSC #undef DWARF_ONE_KNOWN_DW_DSC }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_locexpr_opcode_string (unsigned int code) { static const char *const known[] = { /* Normally we can't afford building huge table of 64K entries, most of them zero, just because there are a couple defined values at the far end. In case of opcodes, it's OK. */ #define DWARF_ONE_KNOWN_DW_OP(NAME, CODE) [CODE] = #NAME, DWARF_ALL_KNOWN_DW_OP #undef DWARF_ONE_KNOWN_DW_OP }; if (likely (code < sizeof (known) / sizeof (known[0]))) return known[code]; return NULL; } static const char * dwarf_unit_string (unsigned int type) { switch (type) { #define DWARF_ONE_KNOWN_DW_UT(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_UT #undef DWARF_ONE_KNOWN_DW_UT default: return NULL; } } static const char * dwarf_range_list_encoding_string (unsigned int kind) { switch (kind) { #define DWARF_ONE_KNOWN_DW_RLE(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_RLE #undef DWARF_ONE_KNOWN_DW_RLE default: return NULL; } } static const char * dwarf_loc_list_encoding_string (unsigned int kind) { switch (kind) { #define DWARF_ONE_KNOWN_DW_LLE(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_LLE #undef DWARF_ONE_KNOWN_DW_LLE /* DW_LLE_GNU_view_pair is special/incompatible with default codes. */ case DW_LLE_GNU_view_pair: return "GNU_view_pair"; default: return NULL; } } static const char * dwarf_line_content_description_string (unsigned int kind) { switch (kind) { #define DWARF_ONE_KNOWN_DW_LNCT(NAME, CODE) case CODE: return #NAME; DWARF_ALL_KNOWN_DW_LNCT #undef DWARF_ONE_KNOWN_DW_LNCT default: return NULL; } } /* Doesn't use dwarf_section_name because we want short (max 6 chars) lowercase strings and result depends on version. */ static const char * dwarf_section_short_string (unsigned int vers, unsigned kind) { const char *sec_str = NULL; if (vers == 2 && (kind == 7 || kind == 8)) /* macinfo or macro */ sec_str = "macro"; else { switch (kind) { case DW_SECT_INFO: sec_str = "info"; break; case DW_SECT_TYPES: sec_str = "types"; /* Only really valid for version 2. */ break; case DW_SECT_ABBREV: sec_str = "abbrv"; break; case DW_SECT_LINE: sec_str = "line"; break; case DW_SECT_LOCLISTS: sec_str = "locs"; break; case DW_SECT_STR_OFFSETS: sec_str = "stroff"; break; case DW_SECT_MACRO: sec_str = "macro"; break; case DW_SECT_RNGLISTS: sec_str = "rngs"; break; } } return sec_str; } /* Used by all dwarf_foo_name functions. */ static const char * string_or_unknown (const char *known, unsigned int code, unsigned int lo_user, unsigned int hi_user, bool print_unknown_num) { static char unknown_buf[20]; if (likely (known != NULL)) return known; if (lo_user != 0 && code >= lo_user && code <= hi_user) { snprintf (unknown_buf, sizeof unknown_buf, "lo_user+%#x", code - lo_user); return unknown_buf; } if (print_unknown_num) { snprintf (unknown_buf, sizeof unknown_buf, "??? (%#x)", code); return unknown_buf; } return "???"; } static const char * dwarf_tag_name (unsigned int tag) { const char *ret = dwarf_tag_string (tag); return string_or_unknown (ret, tag, DW_TAG_lo_user, DW_TAG_hi_user, true); } static const char * dwarf_attr_name (unsigned int attr) { const char *ret = dwarf_attr_string (attr); return string_or_unknown (ret, attr, DW_AT_lo_user, DW_AT_hi_user, true); } static const char * dwarf_form_name (unsigned int form) { const char *ret = dwarf_form_string (form); return string_or_unknown (ret, form, 0, 0, true); } static const char * dwarf_lang_name (unsigned int lang) { const char *ret = dwarf_lang_string (lang); return string_or_unknown (ret, lang, DW_LANG_lo_user, DW_LANG_hi_user, false); } static const char * dwarf_lname_name (unsigned int lname) { const char *ret = dwarf_lname_string (lname); return string_or_unknown (ret, lname, DW_LNAME_lo_user, DW_LNAME_hi_user, false); } static const char * dwarf_inline_name (unsigned int code) { const char *ret = dwarf_inline_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_encoding_name (unsigned int code) { const char *ret = dwarf_encoding_string (code); return string_or_unknown (ret, code, DW_ATE_lo_user, DW_ATE_hi_user, false); } static const char * dwarf_access_name (unsigned int code) { const char *ret = dwarf_access_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_defaulted_name (unsigned int code) { const char *ret = dwarf_defaulted_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_visibility_name (unsigned int code) { const char *ret = dwarf_visibility_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_virtuality_name (unsigned int code) { const char *ret = dwarf_virtuality_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_identifier_case_name (unsigned int code) { const char *ret = dwarf_identifier_case_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_calling_convention_name (unsigned int code) { const char *ret = dwarf_calling_convention_string (code); return string_or_unknown (ret, code, DW_CC_lo_user, DW_CC_hi_user, false); } static const char * dwarf_ordering_name (unsigned int code) { const char *ret = dwarf_ordering_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_discr_list_name (unsigned int code) { const char *ret = dwarf_discr_list_string (code); return string_or_unknown (ret, code, 0, 0, false); } static const char * dwarf_unit_name (unsigned int type) { const char *ret = dwarf_unit_string (type); return string_or_unknown (ret, type, DW_UT_lo_user, DW_UT_hi_user, true); } static const char * dwarf_range_list_encoding_name (unsigned int kind) { const char *ret = dwarf_range_list_encoding_string (kind); return string_or_unknown (ret, kind, 0, 0, false); } static const char * dwarf_loc_list_encoding_name (unsigned int kind) { const char *ret = dwarf_loc_list_encoding_string (kind); return string_or_unknown (ret, kind, 0, 0, false); } static const char * dwarf_line_content_description_name (unsigned int kind) { const char *ret = dwarf_line_content_description_string (kind); return string_or_unknown (ret, kind, DW_LNCT_lo_user, DW_LNCT_hi_user, false); } static void print_block (size_t n, const void *block, FILE *out) { if (n == 0) fputs (empty_block_str, out); else { fprintf (out, "%zu %s:", n, byte_block_str); const unsigned char *data = block; do fprintf (out, " %02x", *data++); while (--n > 0); fputc ('\n', out); } } static void print_bytes (size_t n, const unsigned char *bytes, FILE *out) { while (n-- > 0) { fprintf (out, "%02x", *bytes++); if (n > 0) fprintf (out, " "); } } static int get_indexed_addr (Dwarf_CU *cu, Dwarf_Word idx, Dwarf_Addr *addr) { if (cu == NULL) return -1; Elf_Data *debug_addr = cu->dbg->sectiondata[IDX_debug_addr]; if (debug_addr == NULL) return -1; Dwarf_Off base = __libdw_cu_addr_base (cu); Dwarf_Word off = idx * cu->address_size; if (base > debug_addr->d_size || off > debug_addr->d_size - base || cu->address_size > debug_addr->d_size - base - off) return -1; const unsigned char *addrp = debug_addr->d_buf + base + off; if (cu->address_size == 4) *addr = read_4ubyte_unaligned (cu->dbg, addrp); else *addr = read_8ubyte_unaligned (cu->dbg, addrp); return 0; } static void print_ops (Dwfl_Module *dwflmod, Dwarf *dbg, int indent, int indentrest, unsigned int vers, unsigned int addrsize, unsigned int offset_size, struct Dwarf_CU *cu, Dwarf_Word len, const unsigned char *data, FILE *out) { const unsigned int ref_size = vers < 3 ? addrsize : offset_size; if (len == 0) { fprintf (out, "%*s(empty)\n", indent, ""); return; } #define NEED(n) if (len < (Dwarf_Word) (n)) goto invalid #define CONSUME(n) NEED (n); else len -= (n) Dwarf_Word offset = 0; while (len-- > 0) { uint_fast8_t op = *data++; const char *op_name = dwarf_locexpr_opcode_string (op); if (unlikely (op_name == NULL)) { static char buf[20]; if (op >= DW_OP_lo_user) snprintf (buf, sizeof buf, "lo_user+%#x", op - DW_OP_lo_user); else snprintf (buf, sizeof buf, "??? (%#x)", op); op_name = buf; } switch (op) { case DW_OP_addr:; /* Address operand. */ Dwarf_Word addr; NEED (addrsize); if (addrsize == 4) addr = read_4ubyte_unaligned (dbg, data); else if (addrsize == 8) addr = read_8ubyte_unaligned (dbg, data); else goto invalid; data += addrsize; CONSUME (addrsize); fprintf (out, "%*s[%2" PRIuMAX "] %s ", indent, "", (uintmax_t) offset, op_name); print_dwarf_addr (dwflmod, 0, addr, addr, out); fprintf (out, "\n"); offset += 1 + addrsize; break; case DW_OP_call_ref: case DW_OP_GNU_variable_value: /* Offset operand. */ if (ref_size != 4 && ref_size != 8) goto invalid; /* Cannot be used in CFA. */ NEED (ref_size); if (ref_size == 4) addr = read_4ubyte_unaligned (dbg, data); else addr = read_8ubyte_unaligned (dbg, data); data += ref_size; CONSUME (ref_size); /* addr is a DIE offset, so format it as one. */ fprintf (out, "%*s[%2" PRIuMAX "] %s [%6" PRIxMAX "]\n", indent, "", (uintmax_t) offset, op_name, (uintmax_t) addr); offset += 1 + ref_size; break; case DW_OP_deref_size: case DW_OP_xderef_size: case DW_OP_pick: case DW_OP_const1u: // XXX value might be modified by relocation NEED (1); fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu8 "\n", indent, "", (uintmax_t) offset, op_name, *((uint8_t *) data)); ++data; --len; offset += 2; break; case DW_OP_const2u: NEED (2); // XXX value might be modified by relocation fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu16 "\n", indent, "", (uintmax_t) offset, op_name, read_2ubyte_unaligned (dbg, data)); CONSUME (2); data += 2; offset += 3; break; case DW_OP_const4u: NEED (4); // XXX value might be modified by relocation fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu32 "\n", indent, "", (uintmax_t) offset, op_name, read_4ubyte_unaligned (dbg, data)); CONSUME (4); data += 4; offset += 5; break; case DW_OP_const8u: NEED (8); // XXX value might be modified by relocation fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu64 "\n", indent, "", (uintmax_t) offset, op_name, (uint64_t) read_8ubyte_unaligned (dbg, data)); CONSUME (8); data += 8; offset += 9; break; case DW_OP_const1s: NEED (1); // XXX value might be modified by relocation fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRId8 "\n", indent, "", (uintmax_t) offset, op_name, *((int8_t *) data)); ++data; --len; offset += 2; break; case DW_OP_const2s: NEED (2); // XXX value might be modified by relocation fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRId16 "\n", indent, "", (uintmax_t) offset, op_name, read_2sbyte_unaligned (dbg, data)); CONSUME (2); data += 2; offset += 3; break; case DW_OP_const4s: NEED (4); // XXX value might be modified by relocation fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRId32 "\n", indent, "", (uintmax_t) offset, op_name, read_4sbyte_unaligned (dbg, data)); CONSUME (4); data += 4; offset += 5; break; case DW_OP_const8s: NEED (8); // XXX value might be modified by relocation fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRId64 "\n", indent, "", (uintmax_t) offset, op_name, read_8sbyte_unaligned (dbg, data)); CONSUME (8); data += 8; offset += 9; break; case DW_OP_piece: case DW_OP_regx: case DW_OP_plus_uconst: case DW_OP_constu:; const unsigned char *start = data; uint64_t uleb; NEED (1); get_uleb128 (uleb, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu64 "\n", indent, "", (uintmax_t) offset, op_name, uleb); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_addrx: case DW_OP_GNU_addr_index: case DW_OP_constx: case DW_OP_GNU_const_index:; start = data; NEED (1); get_uleb128 (uleb, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s [%" PRIu64 "] ", indent, "", (uintmax_t) offset, op_name, uleb); CONSUME (data - start); offset += 1 + (data - start); if (get_indexed_addr (cu, uleb, &addr) != 0) fprintf (out, "???\n"); else { print_dwarf_addr (dwflmod, 0, addr, addr, out); fprintf (out, "\n"); } break; case DW_OP_bit_piece: start = data; uint64_t uleb2; NEED (1); get_uleb128 (uleb, data, data + len); NEED (1); get_uleb128 (uleb2, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu64 ", %" PRIu64 "\n", indent, "", (uintmax_t) offset, op_name, uleb, uleb2); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_fbreg: case DW_OP_breg0 ... DW_OP_breg31: case DW_OP_consts: start = data; int64_t sleb; NEED (1); get_sleb128 (sleb, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRId64 "\n", indent, "", (uintmax_t) offset, op_name, sleb); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_bregx: start = data; NEED (1); get_uleb128 (uleb, data, data + len); NEED (1); get_sleb128 (sleb, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu64 " %" PRId64 "\n", indent, "", (uintmax_t) offset, op_name, uleb, sleb); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_call2: NEED (2); fprintf (out, "%*s[%2" PRIuMAX "] %s [%6" PRIx16 "]\n", indent, "", (uintmax_t) offset, op_name, read_2ubyte_unaligned (dbg, data)); CONSUME (2); data += 2; offset += 3; break; case DW_OP_call4: NEED (4); fprintf (out, "%*s[%2" PRIuMAX "] %s [%6" PRIx32 "]\n", indent, "", (uintmax_t) offset, op_name, read_4ubyte_unaligned (dbg, data)); CONSUME (4); data += 4; offset += 5; break; case DW_OP_skip: case DW_OP_bra: NEED (2); fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIuMAX "\n", indent, "", (uintmax_t) offset, op_name, (uintmax_t) (offset + read_2sbyte_unaligned (dbg, data) + 3)); CONSUME (2); data += 2; offset += 3; break; case DW_OP_implicit_value: start = data; NEED (1); get_uleb128 (uleb, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s: ", indent, "", (uintmax_t) offset, op_name); NEED (uleb); print_block (uleb, data, out); data += uleb; CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_implicit_pointer: case DW_OP_GNU_implicit_pointer: /* DIE offset operand. */ start = data; NEED (ref_size); if (ref_size != 4 && ref_size != 8) goto invalid; /* Cannot be used in CFA. */ if (ref_size == 4) addr = read_4ubyte_unaligned (dbg, data); else addr = read_8ubyte_unaligned (dbg, data); data += ref_size; /* Byte offset operand. */ NEED (1); get_sleb128 (sleb, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s [%6" PRIxMAX "] %+" PRId64 "\n", indent, "", (intmax_t) offset, op_name, (uintmax_t) addr, sleb); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_entry_value: case DW_OP_GNU_entry_value: /* Size plus expression block. */ start = data; NEED (1); get_uleb128 (uleb, data, data + len); fprintf (out, "%*s[%2" PRIuMAX "] %s:\n", indent, "", (uintmax_t) offset, op_name); NEED (uleb); print_ops (dwflmod, dbg, indent + 5, indent + 5, vers, addrsize, offset_size, cu, uleb, data, out); data += uleb; CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_const_type: case DW_OP_GNU_const_type: /* uleb128 CU relative DW_TAG_base_type DIE offset, 1-byte unsigned size plus block. */ start = data; NEED (1); get_uleb128 (uleb, data, data + len); if (! print_unresolved_addresses && cu != NULL) uleb += cu->start; NEED (1); uint8_t usize = *(uint8_t *) data++; NEED (usize); fprintf (out, "%*s[%2" PRIuMAX "] %s [%6" PRIxMAX "] ", indent, "", (uintmax_t) offset, op_name, uleb); print_block (usize, data, out); data += usize; CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_regval_type: case DW_OP_GNU_regval_type: /* uleb128 register number, uleb128 CU relative DW_TAG_base_type DIE offset. */ start = data; NEED (1); get_uleb128 (uleb, data, data + len); NEED (1); get_uleb128 (uleb2, data, data + len); if (! print_unresolved_addresses && cu != NULL) uleb2 += cu->start; fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu64 " [%6" PRIx64 "]\n", indent, "", (uintmax_t) offset, op_name, uleb, uleb2); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_deref_type: case DW_OP_GNU_deref_type: /* 1-byte unsigned size of value, uleb128 CU relative DW_TAG_base_type DIE offset. */ start = data; NEED (1); usize = *(uint8_t *) data++; NEED (1); get_uleb128 (uleb, data, data + len); if (! print_unresolved_addresses && cu != NULL) uleb += cu->start; fprintf (out, "%*s[%2" PRIuMAX "] %s %" PRIu8 " [%6" PRIxMAX "]\n", indent, "", (uintmax_t) offset, op_name, usize, uleb); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_xderef_type: /* 1-byte unsigned size of value, uleb128 base_type DIE offset. */ start = data; NEED (1); usize = *(uint8_t *) data++; NEED (1); get_uleb128 (uleb, data, data + len); fprintf (out, "%*s[%4" PRIuMAX "] %s %" PRIu8 " [%6" PRIxMAX "]\n", indent, "", (uintmax_t) offset, op_name, usize, uleb); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_convert: case DW_OP_GNU_convert: case DW_OP_reinterpret: case DW_OP_GNU_reinterpret: /* uleb128 CU relative offset to DW_TAG_base_type, or zero for conversion to untyped. */ start = data; NEED (1); get_uleb128 (uleb, data, data + len); if (uleb != 0 && ! print_unresolved_addresses && cu != NULL) uleb += cu->start; fprintf (out, "%*s[%2" PRIuMAX "] %s [%6" PRIxMAX "]\n", indent, "", (uintmax_t) offset, op_name, uleb); CONSUME (data - start); offset += 1 + (data - start); break; case DW_OP_GNU_parameter_ref: /* 4 byte CU relative reference to the abstract optimized away DW_TAG_formal_parameter. */ NEED (4); uintmax_t param_off = (uintmax_t) read_4ubyte_unaligned (dbg, data); if (! print_unresolved_addresses && cu != NULL) param_off += cu->start; fprintf (out, "%*s[%2" PRIuMAX "] %s [%6" PRIxMAX "]\n", indent, "", (uintmax_t) offset, op_name, param_off); CONSUME (4); data += 4; offset += 5; break; default: /* No Operand. */ fprintf (out, "%*s[%2" PRIuMAX "] %s\n", indent, "", (uintmax_t) offset, op_name); ++offset; break; } indent = indentrest; continue; invalid: fprintf (out, _("%*s[%2" PRIuMAX "] %s <TRUNCATED>\n"), indent, "", (uintmax_t) offset, op_name); break; } } /* Turn the addresses into file offsets by using the phdrs. */ static void find_offsets(Elf *elf, GElf_Addr main_bias, size_t n, GElf_Addr addrs[n], GElf_Off offs[n]) { size_t unsolved = n; for (size_t i = 0; i < phnum; ++i) { GElf_Phdr phdr_mem; GElf_Phdr *phdr = gelf_getphdr(elf, i, &phdr_mem); if (phdr != NULL && phdr->p_type == PT_LOAD && phdr->p_memsz > 0) for (size_t j = 0; j < n; ++j) if (offs[j] == 0 && addrs[j] >= phdr->p_vaddr + main_bias && addrs[j] - (phdr->p_vaddr + main_bias) < phdr->p_filesz) { offs[j] = addrs[j] - (phdr->p_vaddr + main_bias) + phdr->p_offset; if (--unsolved == 0) break; } } } /* The dynamic segment (type PT_DYNAMIC), contains the .dynamic section. And .dynamic section contains an array of the dynamic structures. We use the array to get: DT_STRTAB: the address of the string table DT_SYMTAB: the address of the symbol table DT_STRSZ: the size, in bytes, of the string table ... */ static void get_dynscn_addrs(Elf *elf, GElf_Phdr *phdr, GElf_Addr addrs[i_max]) { Elf_Data *data = elf_getdata_rawchunk( elf, phdr->p_offset, phdr->p_filesz, ELF_T_DYN); int dyn_idx = 0; for (;; ++dyn_idx) { GElf_Dyn dyn_mem; GElf_Dyn *dyn = gelf_getdyn(data, dyn_idx, &dyn_mem); /* DT_NULL Marks end of dynamic section. */ if (dyn == NULL || dyn->d_tag == DT_NULL) break; switch (dyn->d_tag) { case DT_SYMTAB: addrs[i_symtab] = dyn->d_un.d_ptr; break; case DT_HASH: addrs[i_hash] = dyn->d_un.d_ptr; break; case DT_GNU_HASH: addrs[i_gnu_hash] = dyn->d_un.d_ptr; break; case DT_STRTAB: addrs[i_strtab] = dyn->d_un.d_ptr; break; case DT_VERSYM: addrs[i_versym] = dyn->d_un.d_ptr; break; case DT_VERDEF: addrs[i_verdef] = dyn->d_un.d_ptr; break; case DT_VERDEFNUM: addrs[i_verdefnum] = dyn->d_un.d_val; break; case DT_VERNEED: addrs[i_verneed] = dyn->d_un.d_ptr; break; case DT_VERNEEDNUM: addrs[i_verneednum] = dyn->d_un.d_val; break; case DT_STRSZ: addrs[i_strsz] = dyn->d_un.d_val; break; case DT_SYMTAB_SHNDX: addrs[i_symtab_shndx] = dyn->d_un.d_ptr; break; } } } /* Use dynamic segment to get data for the string table section. */ static Elf_Data * get_dynscn_strtab(Elf *elf, GElf_Phdr *phdr) { Elf_Data *strtab_data; GElf_Addr addrs[i_max] = {0,}; GElf_Off offs[i_max] = {0,}; get_dynscn_addrs(elf, phdr, addrs); find_offsets(elf, 0, i_max, addrs, offs); strtab_data = elf_getdata_rawchunk( elf, offs[i_strtab], addrs[i_strsz], ELF_T_BYTE); return strtab_data; } struct listptr { Dwarf_Off offset:(64 - 3); bool addr64:1; bool dwarf64:1; bool warned:1; struct Dwarf_CU *cu; unsigned int attr; }; #define listptr_offset_size(p) ((p)->dwarf64 ? 8 : 4) #define listptr_address_size(p) ((p)->addr64 ? 8 : 4) static Dwarf_Addr cudie_base (Dwarf_Die *cudie) { Dwarf_Addr base; /* Find the base address of the compilation unit. It will normally be specified by DW_AT_low_pc. In DWARF-3 draft 4, the base address could be overridden by DW_AT_entry_pc. It's been removed, but GCC emits DW_AT_entry_pc and not DW_AT_lowpc for compilation units with discontinuous ranges. */ if (unlikely (dwarf_lowpc (cudie, &base) != 0)) { Dwarf_Attribute attr_mem; if (dwarf_formaddr (dwarf_attr (cudie, DW_AT_entry_pc, &attr_mem), &base) != 0) base = 0; } return base; } static Dwarf_Addr listptr_base (struct listptr *p) { Dwarf_Die cu = CUDIE (p->cu); return cudie_base (&cu); } /* To store the name used in compare_listptr */ static _Thread_local const char *sort_listptr_name; static int compare_listptr (const void *a, const void *b) { const char *name = sort_listptr_name; struct listptr *p1 = (void *) a; struct listptr *p2 = (void *) b; if (p1->offset < p2->offset) return -1; if (p1->offset > p2->offset) return 1; if (!p1->warned && !p2->warned) { if (p1->addr64 != p2->addr64) { p1->warned = p2->warned = true; error (0, 0, _("%s %#" PRIx64 " used with different address sizes"), name, (uint64_t) p1->offset); } if (p1->dwarf64 != p2->dwarf64) { p1->warned = p2->warned = true; error (0, 0, _("%s %#" PRIx64 " used with different offset sizes"), name, (uint64_t) p1->offset); } /* Note: CUs can share the same listptr_base. So we don't check (listptr_base (p1) != listptr_base (p2)) */ if (p1->attr != p2 ->attr) { p1->warned = p2->warned = true; error (0, 0, _("%s %#" PRIx64 " used with different attribute %s and %s"), name, (uint64_t) p1->offset, dwarf_attr_name (p1->attr), dwarf_attr_name (p2->attr)); } } return 0; } struct listptr_table { size_t n; size_t alloc; struct listptr *table; }; static struct listptr_table known_locsptr; static struct listptr_table known_loclistsptr; static struct listptr_table known_rangelistptr; static struct listptr_table known_rnglistptr; static struct listptr_table known_addrbases; static struct listptr_table known_stroffbases; static void reset_listptr (struct listptr_table *table) { free (table->table); table->table = NULL; table->n = table->alloc = 0; } /* Returns false if offset doesn't fit. See struct listptr. */ static bool notice_listptr (enum section_e section, struct listptr_table *table, uint_fast8_t address_size, uint_fast8_t offset_size, struct Dwarf_CU *cu, Dwarf_Off offset, unsigned int attr) { if (print_debug_sections & section) { if (table->n == table->alloc) { if (table->alloc == 0) table->alloc = 128; else table->alloc *= 2; table->table = xrealloc (table->table, table->alloc * sizeof table->table[0]); } struct listptr *p = &table->table[table->n++]; *p = (struct listptr) { .addr64 = address_size == 8, .dwarf64 = offset_size == 8, .offset = offset, .cu = cu, .attr = attr }; if (p->offset != offset) { table->n--; return false; } } return true; } static void sort_listptr (struct listptr_table *table, const char *name) { if (table->n > 0) { sort_listptr_name = name; qsort (table->table, table->n, sizeof table->table[0], &compare_listptr); } } static bool skip_listptr_hole (struct listptr_table *table, size_t *idxp, uint_fast8_t *address_sizep, uint_fast8_t *offset_sizep, Dwarf_Addr *base, struct Dwarf_CU **cu, ptrdiff_t offset, unsigned char **readp, unsigned char *endp, unsigned int *attr) { if (table->n == 0) return false; while (*idxp < table->n && table->table[*idxp].offset < (Dwarf_Off) offset) ++*idxp; struct listptr *p = &table->table[*idxp]; if (*idxp == table->n || p->offset >= (Dwarf_Off) (endp - *readp + offset)) { *readp = endp; printf (_(" [%6tx] <UNUSED GARBAGE IN REST OF SECTION>\n"), offset); return true; } if (p->offset != (Dwarf_Off) offset) { *readp += p->offset - offset; printf (_(" [%6tx] <UNUSED GARBAGE> ... %" PRIu64 " bytes ...\n"), offset, (Dwarf_Off) p->offset - offset); return true; } if (address_sizep != NULL) *address_sizep = listptr_address_size (p); if (offset_sizep != NULL) *offset_sizep = listptr_offset_size (p); if (base != NULL) *base = listptr_base (p); if (cu != NULL) *cu = p->cu; if (attr != NULL) *attr = p->attr; return false; } static Dwarf_Off next_listptr_offset (struct listptr_table *table, size_t *idxp, Dwarf_Off off) { /* Note that multiple attributes could in theory point to the same loclist offset, so make sure we pick one that is bigger than the current one. The table is sorted on offset. */ if (*idxp < table->n) { while (++*idxp < table->n) { Dwarf_Off next = table->table[*idxp].offset; if (next > off) return next; } } return 0; } /* Returns the listptr associated with the given index, or NULL. */ static struct listptr * get_listptr (struct listptr_table *table, size_t idx) { if (idx >= table->n) return NULL; return &table->table[idx]; } /* Returns the next index, base address and CU associated with the list unit offsets. If there is none false is returned, otherwise true. Assumes the table has been sorted. */ static bool listptr_cu (struct listptr_table *table, size_t *idxp, Dwarf_Off start, Dwarf_Off end, Dwarf_Addr *base, struct Dwarf_CU **cu) { while (*idxp < table->n && table->table[*idxp].offset < start) ++*idxp; if (*idxp < table->n && table->table[*idxp].offset >= start && table->table[*idxp].offset < end) { struct listptr *p = &table->table[*idxp]; *base = listptr_base (p); *cu = p->cu; return true; } return false; } /* Returns the next index with the current CU for the given attribute. If there is none false is returned, otherwise true. Assumes the table has been sorted. */ static bool listptr_attr (struct listptr_table *table, size_t idxp, Dwarf_Off offset, unsigned int attr) { struct listptr *listptr; do { listptr = get_listptr (table, idxp); if (listptr == NULL) return false; if (listptr->offset == offset && listptr->attr == attr) return true; idxp++; } while (listptr->offset <= offset); return false; } static void print_debug_abbrev_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *elf_data = get_debug_elf_data (dbg, ebl, IDX_debug_abbrev, scn); if (elf_data == NULL) return; const size_t sh_size = elf_data->d_size; fprintf (out, _("\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n" " [ Code]\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); Dwarf_Off offset = 0; while (offset < sh_size) { fprintf (out, _("\nAbbreviation section at offset %" PRIu64 ":\n"), offset); while (1) { size_t length; Dwarf_Abbrev abbrev; int res = dwarf_offabbrev (dbg, offset, &length, &abbrev); if (res != 0) { if (unlikely (res < 0)) { fprintf (out, _("\ *** error while reading abbreviation: %s\n"), dwarf_errmsg (-1)); return; } /* This is the NUL byte at the end of the section. */ ++offset; break; } /* We know these calls can never fail. */ unsigned int code = dwarf_getabbrevcode (&abbrev); unsigned int tag = dwarf_getabbrevtag (&abbrev); int has_children = dwarf_abbrevhaschildren (&abbrev); fprintf (out, " [%5u] %s: %" PRId64 ", %s: %s, %s: %s\n", code, offset_str, (int64_t) offset, children_str, has_children ? yes_str : no_str, tag_str, dwarf_tag_name (tag)); size_t cnt = 0; unsigned int name; unsigned int form; Dwarf_Sword data; Dwarf_Off enoffset; while (dwarf_getabbrevattr_data (&abbrev, cnt, &name, &form, &data, &enoffset) == 0) { fprintf (out, " attr: %s, form: %s", dwarf_attr_name (name), dwarf_form_name (form)); if (form == DW_FORM_implicit_const) fprintf (out, " (%" PRId64 ")", data); fprintf (out, ", offset: %#" PRIx64 "\n", (uint64_t) enoffset); ++cnt; } offset += length; } } } static void print_debug_addr_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_addr, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); if (shdr->sh_size == 0) return; size_t idx = 0; sort_listptr (&known_addrbases, "addr_base"); const unsigned char *start = (const unsigned char *) data->d_buf; const unsigned char *readp = start; const unsigned char *readendp = ((const unsigned char *) data->d_buf + data->d_size); while (readp < readendp) { /* We cannot really know whether or not there is an header. The DebugFission extension to DWARF4 doesn't add one. The DWARF5 .debug_addr variant does. Whether or not we have an header, DW_AT_[GNU_]addr_base points at "index 0". So if the current offset equals the CU addr_base then we can just start printing addresses. If there is no CU with an exact match then we'll try to parse the header first. */ Dwarf_Off off = (Dwarf_Off) (readp - (const unsigned char *) data->d_buf); fprintf (out, "Table at offset %" PRIx64 " ", off); /* Find the first CU that could plausibly be associated with this address base offset. Skip CUs that point their addr_base before this table. */ struct listptr *listptr = get_listptr (&known_addrbases, idx); while (listptr != NULL && listptr->offset < off) listptr = get_listptr (&known_addrbases, ++idx); const unsigned char *next_unitp; uint64_t unit_length; uint16_t version; uint8_t address_size; uint8_t segment_size; if (listptr == NULL) { error (0, 0, "Warning: No CU references .debug_addr after %" PRIx64, off); /* We will have to assume it is just addresses to the end... */ address_size = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8; next_unitp = readendp; fprintf (out, "Unknown CU:\n"); } else { Dwarf_Die cudie; if (dwarf_cu_die (listptr->cu, &cudie, NULL, NULL, NULL, NULL, NULL, NULL) == NULL) fprintf (out, "Unknown CU (%s):\n", dwarf_errmsg (-1)); else fprintf (out, "for CU [%6" PRIx64 "]:\n", dwarf_dieoffset (&cudie)); if (listptr->offset == off) { address_size = listptr_address_size (listptr); segment_size = 0; version = 4; /* The addresses start here, but where do they end? */ listptr = get_listptr (&known_addrbases, idx + 1); if (listptr == NULL) next_unitp = readendp; else if (listptr->cu->version < 5) { next_unitp = start + listptr->offset; if (listptr->offset < off || listptr->offset > data->d_size) { error (0, 0, "Warning: Bad address base for next unit at %" PRIx64, off); next_unitp = readendp; } } else { /* Tricky, we don't have a header for this unit, but there is one for the next. We will have to "guess" how big it is and subtract it from the offset (because that points after the header). */ unsigned int offset_size = listptr_offset_size (listptr); Dwarf_Off next_off = (listptr->offset - (offset_size == 4 ? 4 : 12) /* len */ - 2 /* version */ - 1 /* address size */ - 1); /* segment selector size */ next_unitp = start + next_off; if (next_off < off || next_off > data->d_size) { error (0, 0, "Warning: Couldn't calculate .debug_addr " " unit length at %" PRIx64, off); next_unitp = readendp; } } unit_length = (uint64_t) (next_unitp - readp); /* Pretend we have a header. */ fprintf (out, "\n"); fprintf (out, _(" Length: %8" PRIu64 "\n"), unit_length); fprintf (out, _(" DWARF version: %8" PRIu16 "\n"), version); fprintf (out, _(" Address size: %8" PRIu64 "\n"), (uint64_t) address_size); fprintf (out, _(" Segment size: %8" PRIu64 "\n"), (uint64_t) segment_size); fprintf (out, "\n"); } else { /* OK, we have to parse an header first. */ unit_length = read_4ubyte_unaligned_inc (dbg, readp); if (unlikely (unit_length == 0xffffffff)) { if (unlikely (readp > readendp - 8)) { invalid_data: error (0, 0, "Invalid data"); return; } unit_length = read_8ubyte_unaligned_inc (dbg, readp); } fprintf (out, "\n"); fprintf (out, _(" Length: %8" PRIu64 "\n"), unit_length); /* We need at least 2-bytes (version) + 1-byte (addr_size) + 1-byte (segment_size) = 4 bytes to complete the header. And this unit cannot go beyond the section data. */ if (readp > readendp - 4 || unit_length < 4 || unit_length > (uint64_t) (readendp - readp)) goto invalid_data; next_unitp = readp + unit_length; version = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, _(" DWARF version: %8" PRIu16 "\n"), version); if (version != 5) { error (0, 0, _("Unknown version")); goto next_unit; } address_size = *readp++; fprintf (out, _(" Address size: %8" PRIu64 "\n"), (uint64_t) address_size); if (address_size != 4 && address_size != 8) { error (0, 0, _("unsupported address size")); goto next_unit; } segment_size = *readp++; fprintf (out, _(" Segment size: %8" PRIu64 "\n"), (uint64_t) segment_size); fprintf (out, "\n"); if (segment_size != 0) { error (0, 0, _("unsupported segment size")); goto next_unit; } if (listptr->offset != (Dwarf_Off) (readp - start)) { error (0, 0, "Address index doesn't start after header"); goto next_unit; } } } int digits = 1; size_t addresses = (next_unitp - readp) / address_size; while (addresses >= 10) { ++digits; addresses /= 10; } unsigned int uidx = 0; size_t index_offset = readp - (const unsigned char *) data->d_buf; fprintf (out, " Addresses start at offset 0x%zx:\n", index_offset); while (readp <= next_unitp - address_size) { Dwarf_Addr addr = read_addr_unaligned_inc (address_size, dbg, readp); fprintf (out, " [%*u] ", digits, uidx++); print_dwarf_addr (dwflmod, address_size, addr, addr, out); fprintf (out, "\n"); } fprintf (out, "\n"); if (readp != next_unitp) error (0, 0, "extra %zd bytes at end of unit", (size_t) (next_unitp - readp)); next_unit: readp = next_unitp; } } /* Print content of DWARF .debug_aranges section. We fortunately do not have to know a bit about the structure of the section, libdwarf takes care of it. */ static void print_decoded_aranges_section (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Dwarf_Aranges *aranges; size_t cnt; if (unlikely (dwarf_getaranges (dbg, &aranges, &cnt) != 0)) { error (0, 0, _("cannot get .debug_aranges content: %s"), dwarf_errmsg (-1)); return; } GElf_Shdr glink_mem; GElf_Shdr *glink; glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem); if (glink == NULL) { error (0, 0, _("invalid sh_link value in section %zu"), elf_ndxscn (scn)); return; } fprintf (out, ngettext ("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 " contains %zu entry:\n", "\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 " contains %zu entries:\n", cnt), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset, cnt); /* Compute floor(log16(cnt)). */ size_t tmp = cnt; int digits = 1; while (tmp >= 16) { ++digits; tmp >>= 4; } for (size_t n = 0; n < cnt; ++n) { Dwarf_Arange *runp = dwarf_onearange (aranges, n); if (unlikely (runp == NULL)) { fprintf (out, "cannot get arange %zu: %s\n", n, dwarf_errmsg (-1)); return; } Dwarf_Addr start; Dwarf_Word length; Dwarf_Off offset; if (unlikely (dwarf_getarangeinfo (runp, &start, &length, &offset) != 0)) fprintf (out, _(" [%*zu] ???\n"), digits, n); else fprintf (out, _(" [%*zu] start: %0#*" PRIx64 ", length: %5" PRIu64 ", CU DIE offset: %6" PRId64 "\n"), digits, n, ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 10 : 18, (uint64_t) start, (uint64_t) length, (int64_t) offset); } } /* Print content of DWARF .debug_aranges section. */ static void print_debug_aranges_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { if (decodedaranges) { print_decoded_aranges_section (ebl, ehdr, scn, shdr, dbg, out); return; } Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_aranges, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); const unsigned char *readp = data->d_buf; const unsigned char *readendp = readp + data->d_size; while (readp < readendp) { const unsigned char *hdrstart = readp; size_t start_offset = hdrstart - (const unsigned char *) data->d_buf; fprintf (out, "\n%s %zu:\n", table_offset_lower_str, start_offset); if (readp + 4 > readendp) { invalid_data: error (0, 0, _("invalid data in section [%zu] '%s'"), elf_ndxscn (scn), section_name (ebl, shdr)); return; } Dwarf_Word length = read_4ubyte_unaligned_inc (dbg, readp); unsigned int length_bytes = 4; if (length == DWARF3_LENGTH_64_BIT) { if (readp + 8 > readendp) goto invalid_data; length = read_8ubyte_unaligned_inc (dbg, readp); length_bytes = 8; } const unsigned char *nexthdr = readp + length; fprintf (out, "\n %s: %6" PRIu64 "\n", length_str, (uint64_t) length); if (unlikely (length > (size_t) (readendp - readp))) goto invalid_data; if (length == 0) continue; if (readp + 2 > readendp) goto invalid_data; uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, " %s: %6" PRIuFAST16 "\n", dwarf_ver_str, version); if (version != 2) { error (0, 0, _("unsupported aranges version")); goto next_table; } Dwarf_Word offset; if (readp + length_bytes > readendp) goto invalid_data; if (length_bytes == 8) offset = read_8ubyte_unaligned_inc (dbg, readp); else offset = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, " %s: %6" PRIx64 "\n", cu_offset_str, (uint64_t) offset); if (readp + 1 > readendp) goto invalid_data; unsigned int address_size = *readp++; fprintf (out, " %s: %6" PRIu64 "\n", addr_size_str, (uint64_t) address_size); if (address_size != 4 && address_size != 8) { error (0, 0, _("unsupported address size")); goto next_table; } if (readp + 1 > readendp) goto invalid_data; unsigned int segment_size = *readp++; fprintf (out, " %s: %6" PRIu64 "\n\n", seg_size_str, (uint64_t) segment_size); if (segment_size != 0 && segment_size != 4 && segment_size != 8) { error (0, 0, _("unsupported segment size")); goto next_table; } /* Round the address to the next multiple of 2*address_size. */ readp += ((2 * address_size - ((readp - hdrstart) % (2 * address_size))) % (2 * address_size)); while (readp < nexthdr) { Dwarf_Word range_address; Dwarf_Word range_length; Dwarf_Word segment = 0; if (readp + 2 * address_size + segment_size > readendp) goto invalid_data; if (address_size == 4) { range_address = read_4ubyte_unaligned_inc (dbg, readp); range_length = read_4ubyte_unaligned_inc (dbg, readp); } else { range_address = read_8ubyte_unaligned_inc (dbg, readp); range_length = read_8ubyte_unaligned_inc (dbg, readp); } if (segment_size == 4) segment = read_4ubyte_unaligned_inc (dbg, readp); else if (segment_size == 8) segment = read_8ubyte_unaligned_inc (dbg, readp); if (range_address == 0 && range_length == 0 && segment == 0) break; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, range_address, range_address, out); fprintf (out, ".."); print_dwarf_addr (dwflmod, address_size, range_address + range_length - 1, range_length, out); if (segment_size != 0) fprintf (out, " (%" PRIx64 ")\n", (uint64_t) segment); else fprintf (out, "\n"); } next_table: if (readp != nexthdr) { size_t padding = nexthdr - readp; fprintf (out, _(" %zu padding bytes\n"), padding); readp = nexthdr; } } } static bool is_split_dwarf (Dwarf *dbg, uint64_t *id, Dwarf_CU **split_cu); /* Returns true and sets cu and cu_base if the given Dwarf is a split DWARF (.dwo) file. */ static bool split_dwarf_cu_base (Dwarf *dbg, Dwarf_CU **cu, Dwarf_Addr *cu_base) { uint64_t id; if (is_split_dwarf (dbg, &id, cu)) { Dwarf_Die cudie; if (dwarf_cu_info (*cu, NULL, NULL, &cudie, NULL, NULL, NULL, NULL) == 0) { *cu_base = cudie_base (&cudie); return true; } } return false; } /* Print content of DWARF .debug_rnglists section. */ static void print_debug_rnglists_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg __attribute__((unused)), FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_rnglists, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); /* For the listptr to get the base address/CU. */ sort_listptr (&known_rnglistptr, "rnglistptr"); size_t listptr_idx = 0; const unsigned char *readp = data->d_buf; const unsigned char *const dataend = ((unsigned char *) data->d_buf + data->d_size); while (readp < dataend) { if (unlikely (readp > dataend - 4)) { invalid_data: error (0, 0, _("invalid data in section [%zu] '%s'"), elf_ndxscn (scn), section_name (ebl, shdr)); return; } ptrdiff_t offset = readp - (unsigned char *) data->d_buf; fprintf (out, "%s 0x%" PRIx64 ":\n\n", table_offset_upper_str, (uint64_t) offset); uint64_t unit_length = read_4ubyte_unaligned_inc (dbg, readp); unsigned int offset_size = 4; if (unlikely (unit_length == 0xffffffff)) { if (unlikely (readp > dataend - 8)) goto invalid_data; unit_length = read_8ubyte_unaligned_inc (dbg, readp); offset_size = 8; } fprintf (out, " %s: %8" PRIu64 "\n", length_str, unit_length); /* We need at least 2-bytes + 1-byte + 1-byte + 4-bytes = 8 bytes to complete the header. And this unit cannot go beyond the section data. */ if (readp > dataend - 8 || unit_length < 8 || unit_length > (uint64_t) (dataend - readp)) goto invalid_data; const unsigned char *nexthdr = readp + unit_length; uint16_t version = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, " %s: %8" PRIu16 "\n", dwarf_ver_str, version); if (version != 5) { error (0, 0, _("Unknown version")); goto next_table; } uint8_t address_size = *readp++; fprintf (out, " %s: %8" PRIu64 "\n", addr_size_str, (uint64_t) address_size); if (address_size != 4 && address_size != 8) { error (0, 0, _("unsupported address size")); goto next_table; } uint8_t segment_size = *readp++; fprintf (out, _(" Segment size: %8" PRIu64 "\n"), (uint64_t) segment_size); if (segment_size != 0 && segment_size != 4 && segment_size != 8) { error (0, 0, _("unsupported segment size")); goto next_table; } uint32_t offset_entry_count = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, " %s: %8" PRIu64 "\n", offset_ent_str, (uint64_t) offset_entry_count); /* We need the CU that uses this unit to get the initial base address. */ Dwarf_Addr cu_base = 0; struct Dwarf_CU *cu = NULL; if (listptr_cu (&known_rnglistptr, &listptr_idx, (Dwarf_Off) offset, (Dwarf_Off) (nexthdr - (unsigned char *) data->d_buf), &cu_base, &cu) || split_dwarf_cu_base (dbg, &cu, &cu_base)) { Dwarf_Die cudie; if (dwarf_cu_die (cu, &cudie, NULL, NULL, NULL, NULL, NULL, NULL) == NULL) fprintf (out, " %s: ", unknown_base_str); else fprintf (out, " %s [%6" PRIx64 "] %s: ", cu_str, dwarf_dieoffset (&cudie), base_str); print_dwarf_addr (dwflmod, address_size, cu_base, cu_base, out); fprintf (out, "\n"); } else fprintf (out, _(" Not associated with a CU.\n")); fprintf (out, "\n"); const unsigned char *offset_array_start = readp; if (offset_entry_count > 0) { uint64_t max_entries = (unit_length - 8) / offset_size; if (offset_entry_count > max_entries) { error (0, 0, _("too many offset entries for unit length")); offset_entry_count = max_entries; } fprintf (out, _(" Offsets starting at 0x%" PRIx64 ":\n"), (uint64_t) (offset_array_start - (unsigned char *) data->d_buf)); for (uint32_t idx = 0; idx < offset_entry_count; idx++) { fprintf (out, " [%6" PRIu32 "] ", idx); if (offset_size == 4) { uint32_t off = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, "0x%" PRIx32 "\n", off); } else { uint64_t off = read_8ubyte_unaligned_inc (dbg, readp); fprintf (out, "0x%" PRIx64 "\n", off); } } fprintf (out, "\n"); } Dwarf_Addr base = cu_base; bool start_of_list = true; while (readp < nexthdr) { uint8_t kind = *readp++; uint64_t op1, op2; /* Skip padding. */ if (start_of_list && kind == DW_RLE_end_of_list) continue; if (start_of_list) { base = cu_base; fprintf (out, " Offset: %" PRIx64 ", Index: %" PRIx64 "\n", (uint64_t) (readp - (unsigned char *) data->d_buf - 1), (uint64_t) (readp - offset_array_start - 1)); start_of_list = false; } fprintf (out, " %s", dwarf_range_list_encoding_name (kind)); switch (kind) { case DW_RLE_end_of_list: start_of_list = true; fprintf (out, "\n\n"); break; case DW_RLE_base_addressx: if ((uint64_t) (nexthdr - readp) < 1) { invalid_range: error (0, 0, _("invalid range list data")); goto next_table; } get_uleb128 (op1, readp, nexthdr); fprintf (out, " %" PRIx64 "\n", op1); if (! print_unresolved_addresses) { Dwarf_Addr addr; if (get_indexed_addr (cu, op1, &addr) != 0) fprintf (out, " ???\n"); else { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, addr, addr, out); fprintf (out, "\n"); } } break; case DW_RLE_startx_endx: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_range; get_uleb128 (op1, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < 1) goto invalid_range; get_uleb128 (op2, readp, nexthdr); fprintf (out, " %" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { Dwarf_Addr addr1; Dwarf_Addr addr2; if (get_indexed_addr (cu, op1, &addr1) != 0 || get_indexed_addr (cu, op2, &addr2) != 0) { fprintf (out, " ???..\n"); fprintf (out, " ???\n"); } else { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, addr1, addr1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, addr2 - 1, addr2, out); fprintf (out, "\n"); } } break; case DW_RLE_startx_length: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_range; get_uleb128 (op1, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < 1) goto invalid_range; get_uleb128 (op2, readp, nexthdr); fprintf (out, " %" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { Dwarf_Addr addr1; Dwarf_Addr addr2; if (get_indexed_addr (cu, op1, &addr1) != 0) { fprintf (out, " ???..\n"); fprintf (out, " ???\n"); } else { addr2 = addr1 + op2; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, addr1, addr1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, addr2 - 1, addr2, out); fprintf (out, "\n"); } } break; case DW_RLE_offset_pair: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_range; get_uleb128 (op1, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < 1) goto invalid_range; get_uleb128 (op2, readp, nexthdr); fprintf (out, " %" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { op1 += base; op2 += base; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, op1, op1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, op2 - 1, op2, out); fprintf (out, "\n"); } break; case DW_RLE_base_address: if (address_size == 4) { if ((uint64_t) (nexthdr - readp) < 4) goto invalid_range; op1 = read_4ubyte_unaligned_inc (dbg, readp); } else { if ((uint64_t) (nexthdr - readp) < 8) goto invalid_range; op1 = read_8ubyte_unaligned_inc (dbg, readp); } base = op1; fprintf (out, " 0x%" PRIx64 "\n", base); if (! print_unresolved_addresses) { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, base, base, out); fprintf (out, "\n"); } break; case DW_RLE_start_end: if (address_size == 4) { if ((uint64_t) (nexthdr - readp) < 8) goto invalid_range; op1 = read_4ubyte_unaligned_inc (dbg, readp); op2 = read_4ubyte_unaligned_inc (dbg, readp); } else { if ((uint64_t) (nexthdr - readp) < 16) goto invalid_range; op1 = read_8ubyte_unaligned_inc (dbg, readp); op2 = read_8ubyte_unaligned_inc (dbg, readp); } fprintf (out, " 0x%" PRIx64 "..0x%" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, op1, op1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, op2 - 1, op2, out); fprintf (out, "\n"); } break; case DW_RLE_start_length: if (address_size == 4) { if ((uint64_t) (nexthdr - readp) < 4) goto invalid_range; op1 = read_4ubyte_unaligned_inc (dbg, readp); } else { if ((uint64_t) (nexthdr - readp) < 8) goto invalid_range; op1 = read_8ubyte_unaligned_inc (dbg, readp); } if ((uint64_t) (nexthdr - readp) < 1) goto invalid_range; get_uleb128 (op2, readp, nexthdr); fprintf (out, " 0x%" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { op2 = op1 + op2; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, op1, op1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, op2 - 1, op2, out); fprintf (out, "\n"); } break; default: goto invalid_range; } } next_table: if (readp != nexthdr) { size_t padding = nexthdr - readp; fprintf (out, _(" %zu padding bytes\n\n"), padding); readp = nexthdr; } } } /* Print content of DWARF .debug_ranges section. */ static void print_debug_ranges_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_ranges, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); sort_listptr (&known_rangelistptr, "rangelistptr"); size_t listptr_idx = 0; uint_fast8_t address_size = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8; bool first = true; Dwarf_Addr base = 0; unsigned char *const endp = (unsigned char *) data->d_buf + data->d_size; unsigned char *readp = data->d_buf; Dwarf_CU *last_cu = NULL; while (readp < endp) { ptrdiff_t offset = readp - (unsigned char *) data->d_buf; Dwarf_CU *cu = last_cu; if (first && skip_listptr_hole (&known_rangelistptr, &listptr_idx, &address_size, NULL, &base, &cu, offset, &readp, endp, NULL)) continue; if (last_cu != cu) { Dwarf_Die cudie; if (dwarf_cu_die (cu, &cudie, NULL, NULL, NULL, NULL, NULL, NULL) == NULL) fprintf (out, _("\n Unknown CU base: ")); else fprintf (out, _("\n CU [%6" PRIx64 "] base: "), dwarf_dieoffset (&cudie)); print_dwarf_addr (dwflmod, address_size, base, base, out); fprintf (out, "\n"); } last_cu = cu; if (unlikely (data->d_size - offset < (size_t) address_size * 2)) { fprintf (out, _(" [%6tx] <INVALID DATA>\n"), offset); break; } Dwarf_Addr begin; Dwarf_Addr end; if (address_size == 8) { begin = read_8ubyte_unaligned_inc (dbg, readp); end = read_8ubyte_unaligned_inc (dbg, readp); } else { begin = read_4ubyte_unaligned_inc (dbg, readp); end = read_4ubyte_unaligned_inc (dbg, readp); if (begin == (Dwarf_Addr) (uint32_t) -1) begin = (Dwarf_Addr) -1l; } if (begin == (Dwarf_Addr) -1l) /* Base address entry. */ { if (first) fprintf (out, " [%6tx] ", offset); else fprintf (out, " "); fputs (_("base address\n"), out); fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, end, end, out); fprintf (out, "\n"); base = end; first = false; } else if (begin == 0 && end == 0) /* End of list entry. */ { if (first) fprintf (out, _(" [%6tx] empty list\n"), offset); first = true; } else { /* We have an address range entry. */ if (first) /* First address range entry in a list. */ fprintf (out, " [%6tx] ", offset); else fprintf (out, " "); fprintf (out, "range %" PRIx64 ", %" PRIx64 "\n", begin, end); if (! print_unresolved_addresses) { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, base + begin, base + begin, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, base + end - 1, base + end, out); fprintf (out, "\n"); } first = false; } } } #define REGNAMESZ 16 static const char * register_info (Ebl *ebl, unsigned int regno, const Ebl_Register_Location *loc, char name[REGNAMESZ], int *bits, int *type) { const char *set; const char *pfx; int ignore; ssize_t n = ebl_register_info (ebl, regno, name, REGNAMESZ, &pfx, &set, bits ?: &ignore, type ?: &ignore); if (n <= 0) { if (loc != NULL) snprintf (name, REGNAMESZ, "reg%u", loc->regno); else snprintf (name, REGNAMESZ, "??? 0x%x", regno); if (bits != NULL) *bits = loc != NULL ? loc->bits : 0; if (type != NULL) *type = DW_ATE_unsigned; set = "??? unrecognized"; } else { if (bits != NULL && *bits <= 0) *bits = loc != NULL ? loc->bits : 0; if (type != NULL && *type == DW_ATE_void) *type = DW_ATE_unsigned; } return set; } static const unsigned char * read_encoded (unsigned int encoding, const unsigned char *readp, const unsigned char *const endp, uint64_t *res, Dwarf *dbg) { if ((encoding & 0xf) == DW_EH_PE_absptr) encoding = gelf_getclass (dbg->elf) == ELFCLASS32 ? DW_EH_PE_udata4 : DW_EH_PE_udata8; switch (encoding & 0xf) { case DW_EH_PE_uleb128: if (readp >= endp) goto invalid; get_uleb128 (*res, readp, endp); break; case DW_EH_PE_sleb128: if (readp >= endp) goto invalid; get_sleb128 (*res, readp, endp); break; case DW_EH_PE_udata2: if (readp + 2 > endp) goto invalid; *res = read_2ubyte_unaligned_inc (dbg, readp); break; case DW_EH_PE_udata4: if (readp + 4 > endp) goto invalid; *res = read_4ubyte_unaligned_inc (dbg, readp); break; case DW_EH_PE_udata8: if (readp + 8 > endp) goto invalid; *res = read_8ubyte_unaligned_inc (dbg, readp); break; case DW_EH_PE_sdata2: if (readp + 2 > endp) goto invalid; *res = read_2sbyte_unaligned_inc (dbg, readp); break; case DW_EH_PE_sdata4: if (readp + 4 > endp) goto invalid; *res = read_4sbyte_unaligned_inc (dbg, readp); break; case DW_EH_PE_sdata8: if (readp + 8 > endp) goto invalid; *res = read_8sbyte_unaligned_inc (dbg, readp); break; default: invalid: error (1, 0, _("invalid encoding")); } return readp; } static const char * regname (Ebl *ebl, unsigned int regno, char *regnamebuf) { register_info (ebl, regno, NULL, regnamebuf, NULL, NULL); return regnamebuf; } static void print_cfa_program (const unsigned char *readp, const unsigned char *const endp, Dwarf_Word vma_base, unsigned int code_align, int data_align, unsigned int version, unsigned int ptr_size, unsigned int encoding, Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Dwarf *dbg, FILE *out) { char regnamebuf[REGNAMESZ]; fputs ("\n Program:\n", out); Dwarf_Word pc = vma_base; while (readp < endp) { unsigned int opcode = *readp++; if (opcode < DW_CFA_advance_loc) /* Extended opcode. */ switch (opcode) { uint64_t op1; int64_t sop1; uint64_t op2; int64_t sop2; case DW_CFA_nop: fputs (" nop\n", out); break; case DW_CFA_set_loc: if ((uint64_t) (endp - readp) < 1) goto invalid; readp = read_encoded (encoding, readp, endp, &op1, dbg); fprintf (out, " set_loc %#" PRIx64 " to %#" PRIx64 "\n", op1, pc = vma_base + op1); break; case DW_CFA_advance_loc1: if ((uint64_t) (endp - readp) < 1) goto invalid; fprintf (out, " advance_loc1 %u to %#" PRIx64 "\n", *readp, pc += *readp * code_align); ++readp; break; case DW_CFA_advance_loc2: if ((uint64_t) (endp - readp) < 2) goto invalid; op1 = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, " advance_loc2 %" PRIu64 " to %#" PRIx64 "\n", op1, pc += op1 * code_align); break; case DW_CFA_advance_loc4: if ((uint64_t) (endp - readp) < 4) goto invalid; op1 = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, " advance_loc4 %" PRIu64 " to %#" PRIx64 "\n", op1, pc += op1 * code_align); break; case DW_CFA_offset_extended: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op2, readp, endp); fprintf (out, " offset_extended r%" PRIu64 " (%s) at cfa%+" PRId64 "\n", op1, regname (ebl, op1, regnamebuf), op2 * data_align); break; case DW_CFA_restore_extended: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); fprintf (out, " restore_extended r%" PRIu64 " (%s)\n", op1, regname (ebl, op1, regnamebuf)); break; case DW_CFA_undefined: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); fprintf (out, " undefined r%" PRIu64 " (%s)\n", op1, regname (ebl, op1, regnamebuf)); break; case DW_CFA_same_value: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); fprintf (out, " same_value r%" PRIu64 " (%s)\n", op1, regname (ebl, op1, regnamebuf)); break; case DW_CFA_register: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op2, readp, endp); fprintf (out, " register r%" PRIu64 " (%s) in r%" PRIu64 " (%s)\n", op1, regname (ebl, op1, regnamebuf), op2, regname (ebl, op2, regnamebuf)); break; case DW_CFA_remember_state: fputs (" remember_state\n", out); break; case DW_CFA_restore_state: fputs (" restore_state\n", out); break; case DW_CFA_def_cfa: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op2, readp, endp); fprintf (out, " def_cfa r%" PRIu64 " (%s) at offset %" PRIu64 "\n", op1, regname (ebl, op1, regnamebuf), op2); break; case DW_CFA_def_cfa_register: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); fprintf (out, " def_cfa_register r%" PRIu64 " (%s)\n", op1, regname (ebl, op1, regnamebuf)); break; case DW_CFA_def_cfa_offset: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); fprintf (out, " def_cfa_offset %" PRIu64 "\n", op1); break; case DW_CFA_def_cfa_expression: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); /* Length of DW_FORM_block. */ fprintf (out, " def_cfa_expression %" PRIu64 "\n", op1); if ((uint64_t) (endp - readp) < op1) { invalid: fputs (_(" <INVALID DATA>\n"), out); return; } print_ops (dwflmod, dbg, 10, 10, version, ptr_size, 0, NULL, op1, readp, out); readp += op1; break; case DW_CFA_expression: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op2, readp, endp); /* Length of DW_FORM_block. */ fprintf (out, " expression r%" PRIu64 " (%s) \n", op1, regname (ebl, op1, regnamebuf)); if ((uint64_t) (endp - readp) < op2) goto invalid; print_ops (dwflmod, dbg, 10, 10, version, ptr_size, 0, NULL, op2, readp, out); readp += op2; break; case DW_CFA_offset_extended_sf: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_sleb128 (sop2, readp, endp); fprintf (out, " offset_extended_sf r%" PRIu64 " (%s) at cfa%+" PRId64 "\n", op1, regname (ebl, op1, regnamebuf), sop2 * data_align); break; case DW_CFA_def_cfa_sf: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_sleb128 (sop2, readp, endp); fprintf (out, " def_cfa_sf r%" PRIu64 " (%s) at offset %" PRId64 "\n", op1, regname (ebl, op1, regnamebuf), sop2 * data_align); break; case DW_CFA_def_cfa_offset_sf: if ((uint64_t) (endp - readp) < 1) goto invalid; get_sleb128 (sop1, readp, endp); fprintf (out, " def_cfa_offset_sf %" PRId64 "\n", sop1 * data_align); break; case DW_CFA_val_offset: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op2, readp, endp); fprintf (out, " val_offset %" PRIu64 " at offset %" PRIu64 "\n", op1, op2 * data_align); break; case DW_CFA_val_offset_sf: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_sleb128 (sop2, readp, endp); fprintf (out, " val_offset_sf %" PRIu64 " at offset %" PRId64 "\n", op1, sop2 * data_align); break; case DW_CFA_val_expression: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op2, readp, endp); /* Length of DW_FORM_block. */ fprintf (out, " val_expression r%" PRIu64 " (%s)\n", op1, regname (ebl, op1, regnamebuf)); if ((uint64_t) (endp - readp) < op2) goto invalid; print_ops (dwflmod, dbg, 10, 10, version, ptr_size, 0, NULL, op2, readp, out); readp += op2; break; case DW_CFA_MIPS_advance_loc8: if ((uint64_t) (endp - readp) < 8) goto invalid; op1 = read_8ubyte_unaligned_inc (dbg, readp); fprintf (out, " MIPS_advance_loc8 %" PRIu64 " to %#" PRIx64 "\n", op1, pc += op1 * code_align); break; case DW_CFA_GNU_window_save: /* DW_CFA_AARCH64_negate_ra_state */ if (ehdr->e_machine == EM_AARCH64) fputs (" AARCH64_negate_ra_state\n", out); else fputs (" GNU_window_save\n", out); break; case DW_CFA_GNU_args_size: if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (op1, readp, endp); fprintf (out, " args_size %" PRIu64 "\n", op1); break; default: fprintf (out, " ??? (%u)\n", opcode); break; } else if (opcode < DW_CFA_offset) fprintf (out, " advance_loc %u to %#" PRIx64 "\n", opcode & 0x3f, pc += (opcode & 0x3f) * code_align); else if (opcode < DW_CFA_restore) { uint64_t offset; if ((uint64_t) (endp - readp) < 1) goto invalid; get_uleb128 (offset, readp, endp); fprintf (out, " offset r%u (%s) at cfa%+" PRId64 "\n", opcode & 0x3f, regname (ebl, opcode & 0x3f, regnamebuf), offset * data_align); } else fprintf (out, " restore r%u (%s)\n", opcode & 0x3f, regname (ebl, opcode & 0x3f, regnamebuf)); } } static unsigned int encoded_ptr_size (int encoding, unsigned int ptr_size) { switch (encoding & 7) { case DW_EH_PE_udata4: return 4; case DW_EH_PE_udata8: return 8; case 0: return ptr_size; } fprintf (stderr, "Unsupported pointer encoding: %#x, " "assuming pointer size of %d.\n", encoding, ptr_size); return ptr_size; } static unsigned int print_encoding (unsigned int val, FILE *out) { switch (val & 0xf) { case DW_EH_PE_absptr: fputs ("absptr", out); break; case DW_EH_PE_uleb128: fputs ("uleb128", out); break; case DW_EH_PE_udata2: fputs ("udata2", out); break; case DW_EH_PE_udata4: fputs ("udata4", out); break; case DW_EH_PE_udata8: fputs ("udata8", out); break; case DW_EH_PE_sleb128: fputs ("sleb128", out); break; case DW_EH_PE_sdata2: fputs ("sdata2", out); break; case DW_EH_PE_sdata4: fputs ("sdata4", out); break; case DW_EH_PE_sdata8: fputs ("sdata8", out); break; default: /* We did not use any of the bits after all. */ return val; } return val & ~0xf; } static unsigned int print_relinfo (unsigned int val, FILE *out) { switch (val & 0x70) { case DW_EH_PE_pcrel: fputs ("pcrel", out); break; case DW_EH_PE_textrel: fputs ("textrel", out); break; case DW_EH_PE_datarel: fputs ("datarel", out); break; case DW_EH_PE_funcrel: fputs ("funcrel", out); break; case DW_EH_PE_aligned: fputs ("aligned", out); break; default: return val; } return val & ~0x70; } static void print_encoding_base (const char *pfx, unsigned int fde_encoding, FILE *out) { fprintf (out, "(%s", pfx); if (fde_encoding == DW_EH_PE_omit) fputs ("omit)\n", out); else { unsigned int w = fde_encoding; w = print_encoding (w, out); if (w & 0x70) { if (w != fde_encoding) fputc (' ', out); w = print_relinfo (w, out); } if (w != 0) fprintf (out, "%s%x", w != fde_encoding ? " " : "", w); fputs (")\n", out); } } static void print_debug_frame_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { size_t shstrndx; /* We know this call will succeed since it did in the caller. */ (void) elf_getshdrstrndx (ebl->elf, &shstrndx); const char *scnname = section_name (ebl, shdr); /* Needed if we find PC-relative addresses. */ GElf_Addr bias; if (dwfl_module_getelf (dwflmod, &bias) == NULL) { error (0, 0, _("cannot get ELF: %s"), dwfl_errmsg (-1)); return; } bool is_eh_frame = strcmp (scnname, ".eh_frame") == 0; Elf_Data *data; if (is_eh_frame) { data = elf_rawdata (scn, NULL); if (data == NULL) { error (0, 0, _("cannot get %s content: %s"), scnname, elf_errmsg (-1)); return; } } else { data = get_debug_elf_data (dbg, ebl, IDX_debug_frame, scn); if (data == NULL) return; } if (is_eh_frame) fprintf (out, _("\ \nCall frame information section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), scnname, (uint64_t) shdr->sh_offset); else fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), scnname, (uint64_t) shdr->sh_offset); struct cieinfo { ptrdiff_t cie_offset; const char *augmentation; unsigned int code_alignment_factor; unsigned int data_alignment_factor; uint8_t address_size; uint8_t fde_encoding; uint8_t lsda_encoding; struct cieinfo *next; } *cies = NULL; const unsigned char *readp = data->d_buf; const unsigned char *const dataend = ((unsigned char *) data->d_buf + data->d_size); while (readp < dataend) { if (unlikely (readp + 4 > dataend)) { invalid_data: error (0, 0, _("invalid data in section [%zu] '%s'"), elf_ndxscn (scn), scnname); return; } /* At the beginning there must be a CIE. There can be multiple, hence we test tis in a loop. */ ptrdiff_t offset = readp - (unsigned char *) data->d_buf; Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, readp); unsigned int length = 4; if (unlikely (unit_length == 0xffffffff)) { if (unlikely (readp + 8 > dataend)) goto invalid_data; unit_length = read_8ubyte_unaligned_inc (dbg, readp); length = 8; } if (unlikely (unit_length == 0)) { fprintf (out, _("\n [%6tx] Zero terminator\n"), offset); continue; } Dwarf_Word maxsize = dataend - readp; if (unlikely (unit_length > maxsize)) goto invalid_data; unsigned int ptr_size = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8; ptrdiff_t start = readp - (unsigned char *) data->d_buf; const unsigned char *const cieend = readp + unit_length; if (unlikely (cieend > dataend)) goto invalid_data; Dwarf_Off cie_id; if (length == 4) { if (unlikely (cieend - readp < 4)) goto invalid_data; cie_id = read_4ubyte_unaligned_inc (dbg, readp); if (!is_eh_frame && cie_id == DW_CIE_ID_32) cie_id = DW_CIE_ID_64; } else { if (unlikely (cieend - readp < 8)) goto invalid_data; cie_id = read_8ubyte_unaligned_inc (dbg, readp); } uint_fast8_t version = 2; unsigned int code_alignment_factor; int data_alignment_factor; unsigned int fde_encoding = 0; unsigned int lsda_encoding = 0; Dwarf_Word initial_location = 0; Dwarf_Word vma_base = 0; if (cie_id == (is_eh_frame ? 0 : DW_CIE_ID_64)) { if (unlikely (cieend - readp < 2)) goto invalid_data; version = *readp++; const char *const augmentation = (const char *) readp; readp = memchr (readp, '\0', cieend - readp); if (unlikely (readp == NULL)) goto invalid_data; ++readp; uint_fast8_t segment_size = 0; if (version >= 4) { if (cieend - readp < 5) goto invalid_data; ptr_size = *readp++; segment_size = *readp++; } if (cieend - readp < 1) goto invalid_data; get_uleb128 (code_alignment_factor, readp, cieend); if (cieend - readp < 1) goto invalid_data; get_sleb128 (data_alignment_factor, readp, cieend); /* In some variant for unwind data there is another field. */ if (strcmp (augmentation, "eh") == 0) readp += ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8; unsigned int return_address_register; if (cieend - readp < 1) goto invalid_data; if (unlikely (version == 1)) return_address_register = *readp++; else get_uleb128 (return_address_register, readp, cieend); fprintf (out, "\n [%6tx] CIE length=%" PRIu64 "\n" " CIE_id: %" PRIu64 "\n" " version: %u\n" " augmentation: \"%s\"\n", offset, (uint64_t) unit_length, (uint64_t) cie_id, version, augmentation); if (version >= 4) fprintf (out, " address_size: %u\n" " segment_size: %u\n", ptr_size, segment_size); fprintf (out, " code_alignment_factor: %u\n" " data_alignment_factor: %d\n" " return_address_register: %u\n", code_alignment_factor, data_alignment_factor, return_address_register); if (augmentation[0] == 'z') { if (cieend - readp < 1) goto invalid_data; unsigned int augmentationlen; get_uleb128 (augmentationlen, readp, cieend); if (augmentationlen > (size_t) (cieend - readp)) { error (0, 0, _("invalid augmentation length")); readp = cieend; continue; } const char *hdr = "Augmentation data:"; const char *cp = augmentation + 1; while (*cp != '\0' && cp < augmentation + augmentationlen + 1) { fprintf (out, " %-26s%#x ", hdr, *readp); hdr = ""; if (*cp == 'R') { fde_encoding = *readp++; print_encoding_base (_("FDE address encoding: "), fde_encoding, out); } else if (*cp == 'L') { lsda_encoding = *readp++; print_encoding_base (_("LSDA pointer encoding: "), lsda_encoding, out); } else if (*cp == 'P') { /* Personality. This field usually has a relocation attached pointing to __gcc_personality_v0. */ const unsigned char *startp = readp; unsigned int encoding = *readp++; uint64_t val = 0; readp = read_encoded (encoding, readp, readp - 1 + augmentationlen, &val, dbg); while (++startp < readp) fprintf (out, "%#x ", *startp); fputc ('(', out); print_encoding (encoding, out); fputc (' ', out); switch (encoding & 0xf) { case DW_EH_PE_sleb128: case DW_EH_PE_sdata2: case DW_EH_PE_sdata4: fprintf (out, "%" PRId64 ")\n", val); break; default: fprintf (out, "%#" PRIx64 ")\n", val); break; } } else fprintf (out, "(%x)\n", *readp++); ++cp; } } if (likely (ptr_size == 4 || ptr_size == 8)) { struct cieinfo *newp = alloca (sizeof (*newp)); newp->cie_offset = offset; newp->augmentation = augmentation; newp->fde_encoding = fde_encoding; newp->lsda_encoding = lsda_encoding; newp->address_size = ptr_size; newp->code_alignment_factor = code_alignment_factor; newp->data_alignment_factor = data_alignment_factor; newp->next = cies; cies = newp; } } else { struct cieinfo *cie = cies; while (cie != NULL) if (is_eh_frame ? ((Dwarf_Off) start - cie_id) == (Dwarf_Off) cie->cie_offset : cie_id == (Dwarf_Off) cie->cie_offset) break; else cie = cie->next; if (unlikely (cie == NULL)) { fputs ("invalid CIE reference in FDE\n", out); return; } /* Initialize from CIE data. */ fde_encoding = cie->fde_encoding; lsda_encoding = cie->lsda_encoding; ptr_size = encoded_ptr_size (fde_encoding, cie->address_size); code_alignment_factor = cie->code_alignment_factor; data_alignment_factor = cie->data_alignment_factor; const unsigned char *base = readp; // XXX There are sometimes relocations for this value initial_location = read_addr_unaligned_inc (ptr_size, dbg, readp); Dwarf_Word address_range = read_addr_unaligned_inc (ptr_size, dbg, readp); /* pcrel for an FDE address is relative to the runtime address of the start_address field itself. Sign extend if necessary to make sure the calculation is done on the full 64 bit address even when initial_location only holds the lower 32 bits. */ Dwarf_Addr pc_start = initial_location; if (ptr_size == 4) pc_start = (uint64_t) (int32_t) pc_start; if ((fde_encoding & 0x70) == DW_EH_PE_pcrel) pc_start += ((uint64_t) shdr->sh_addr + (base - (const unsigned char *) data->d_buf) - bias); fprintf (out, "\n [%6tx] FDE length=%" PRIu64 " cie=[%6tx]\n" " CIE_pointer: %" PRIu64 "\n" " initial_location: ", offset, (uint64_t) unit_length, cie->cie_offset, (uint64_t) cie_id); print_dwarf_addr (dwflmod, cie->address_size, pc_start, initial_location, out); if ((fde_encoding & 0x70) == DW_EH_PE_pcrel) { vma_base = (((uint64_t) shdr->sh_offset + (base - (const unsigned char *) data->d_buf) + (uint64_t) initial_location) & (ptr_size == 4 ? UINT64_C (0xffffffff) : UINT64_C (0xffffffffffffffff))); fprintf (out, _(" (offset: %#" PRIx64 ")"), (uint64_t) vma_base); } fprintf (out, "\n address_range: %#" PRIx64, (uint64_t) address_range); if ((fde_encoding & 0x70) == DW_EH_PE_pcrel) fprintf (out, _(" (end offset: %#" PRIx64 ")"), ((uint64_t) vma_base + (uint64_t) address_range) & (ptr_size == 4 ? UINT64_C (0xffffffff) : UINT64_C (0xffffffffffffffff))); fputc ('\n', out); if (cie->augmentation[0] == 'z') { unsigned int augmentationlen; if (cieend - readp < 1) goto invalid_data; get_uleb128 (augmentationlen, readp, cieend); if (augmentationlen > (size_t) (cieend - readp)) { error (0, 0, _("invalid augmentation length")); readp = cieend; continue; } if (augmentationlen > 0) { const char *hdr = "Augmentation data:"; const char *cp = cie->augmentation + 1; unsigned int u = 0; while (*cp != '\0' && cp < cie->augmentation + augmentationlen + 1) { if (*cp == 'L') { uint64_t lsda_pointer; const unsigned char *p = read_encoded (lsda_encoding, &readp[u], &readp[augmentationlen], &lsda_pointer, dbg); u = p - readp; fprintf (out, _("\ %-26sLSDA pointer: %#" PRIx64 "\n"), hdr, lsda_pointer); hdr = ""; } ++cp; } while (u < augmentationlen) { fprintf (out, " %-26s%#x\n", hdr, readp[u++]); hdr = ""; } } readp += augmentationlen; } } /* Handle the initialization instructions. */ if (ptr_size != 4 && ptr_size !=8) fprintf (out, "invalid CIE pointer size (%u), must be 4 or 8.\n", ptr_size); else print_cfa_program (readp, cieend, vma_base, code_alignment_factor, data_alignment_factor, version, ptr_size, fde_encoding, dwflmod, ebl, ehdr, dbg, out); readp = cieend; } } /* Returns the signedness (or false if it cannot be determined) and the byte size (or zero if it cannot be gotten) of the given DIE DW_AT_type attribute. Uses dwarf_peel_type and dwarf_aggregate_size. */ static void die_type_sign_bytes (Dwarf_Die *die, bool *is_signed, int *bytes) { Dwarf_Attribute attr; Dwarf_Die type; *bytes = 0; *is_signed = false; if (dwarf_peel_type (dwarf_formref_die (dwarf_attr_integrate (die, DW_AT_type, &attr), &type), &type) == 0) { Dwarf_Word val; *is_signed = (dwarf_formudata (dwarf_attr (&type, DW_AT_encoding, &attr), &val) == 0 && (val == DW_ATE_signed || val == DW_ATE_signed_char)); if (dwarf_aggregate_size (&type, &val) == 0) *bytes = val; } } struct attrcb_args { Dwfl_Module *dwflmod; Dwarf *dbg; Dwarf_Die *dies; int level; bool silent; bool is_split; unsigned int version; unsigned int addrsize; unsigned int offset_size; struct Dwarf_CU *cu; FILE *out; }; static int attr_callback (Dwarf_Attribute *attrp, void *arg) { struct attrcb_args *cbargs = (struct attrcb_args *) arg; const int level = cbargs->level; Dwarf_Die *die = &cbargs->dies[level]; bool is_split = cbargs->is_split; FILE *out = cbargs->out; unsigned int attr = dwarf_whatattr (attrp); if (unlikely (attr == 0)) { if (!cbargs->silent) error (0, 0, _("DIE [%" PRIx64 "] " "cannot get attribute code: %s"), dwarf_dieoffset (die), dwarf_errmsg (-1)); return DWARF_CB_ABORT; } unsigned int form = dwarf_whatform (attrp); if (unlikely (form == 0)) { if (!cbargs->silent) error (0, 0, _("DIE [%" PRIx64 "] " "cannot get attribute form: %s"), dwarf_dieoffset (die), dwarf_errmsg (-1)); return DWARF_CB_ABORT; } switch (form) { case DW_FORM_addr: case DW_FORM_addrx: case DW_FORM_addrx1: case DW_FORM_addrx2: case DW_FORM_addrx3: case DW_FORM_addrx4: case DW_FORM_GNU_addr_index: if (!cbargs->silent) { Dwarf_Addr addr; if (unlikely (dwarf_formaddr (attrp, &addr) != 0)) { attrval_out: if (!cbargs->silent) error (0, 0, _("DIE [%" PRIx64 "] " "cannot get attribute '%s' (%s) value: " "%s"), dwarf_dieoffset (die), dwarf_attr_name (attr), dwarf_form_name (form), dwarf_errmsg (-1)); /* Don't ABORT, it might be other attributes can be resolved. */ return DWARF_CB_OK; } if (form != DW_FORM_addr ) { Dwarf_Word word; if (dwarf_formudata (attrp, &word) != 0) goto attrval_out; fprintf (out, " %*s%-20s (%s) [%" PRIx64 "] ", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), word); } else fprintf (out, " %*s%-20s (%s) ", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form)); print_dwarf_addr (cbargs->dwflmod, cbargs->addrsize, addr, addr, out); fprintf (out, "\n"); } break; case DW_FORM_indirect: case DW_FORM_strp: case DW_FORM_line_strp: case DW_FORM_strx: case DW_FORM_strx1: case DW_FORM_strx2: case DW_FORM_strx3: case DW_FORM_strx4: case DW_FORM_string: case DW_FORM_GNU_strp_alt: case DW_FORM_GNU_str_index: if (cbargs->silent) break; const char *str = dwarf_formstring (attrp); if (unlikely (str == NULL)) goto attrval_out; fprintf (out, " %*s%-20s (%s) \"%s\"\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), str); break; case DW_FORM_ref_addr: case DW_FORM_ref_udata: case DW_FORM_ref8: case DW_FORM_ref4: case DW_FORM_ref2: case DW_FORM_ref1: case DW_FORM_GNU_ref_alt: case DW_FORM_ref_sup4: case DW_FORM_ref_sup8: if (cbargs->silent) break; Dwarf_Die ref; if (unlikely (dwarf_formref_die (attrp, &ref) == NULL)) goto attrval_out; fprintf (out, " %*s%-20s (%s) ", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form)); if (is_split) fprintf (out, "{%6" PRIxMAX "}\n", (uintmax_t) dwarf_dieoffset (&ref)); else fprintf (out, "[%6" PRIxMAX "]\n", (uintmax_t) dwarf_dieoffset (&ref)); break; case DW_FORM_ref_sig8: if (cbargs->silent) break; fprintf (out, " %*s%-20s (%s) {%6" PRIx64 "}\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uint64_t) read_8ubyte_unaligned (attrp->cu->dbg, attrp->valp)); break; case DW_FORM_sec_offset: case DW_FORM_rnglistx: case DW_FORM_loclistx: case DW_FORM_implicit_const: case DW_FORM_udata: case DW_FORM_sdata: case DW_FORM_data8: /* Note no data16 here, we see that as block. */ case DW_FORM_data4: case DW_FORM_data2: case DW_FORM_data1:; Dwarf_Word num; if (unlikely (dwarf_formudata (attrp, &num) != 0)) goto attrval_out; const char *valuestr = NULL; bool as_hex_id = false; switch (attr) { /* This case can take either a constant or a loclistptr. */ case DW_AT_data_member_location: if (form != DW_FORM_sec_offset && (cbargs->version >= 4 || (form != DW_FORM_data4 && form != DW_FORM_data8))) { if (!cbargs->silent) fprintf (out, " %*s%-20s (%s) %" PRIuMAX "\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num); return DWARF_CB_OK; } FALLTHROUGH; /* These cases always take a loclist[ptr] and no constant. */ case DW_AT_location: case DW_AT_data_location: case DW_AT_vtable_elem_location: case DW_AT_string_length: case DW_AT_use_location: case DW_AT_frame_base: case DW_AT_return_addr: case DW_AT_static_link: case DW_AT_segment: case DW_AT_GNU_call_site_value: case DW_AT_GNU_call_site_data_value: case DW_AT_GNU_call_site_target: case DW_AT_GNU_call_site_target_clobbered: case DW_AT_GNU_locviews: { bool nlpt; if (cbargs->cu->version < 5) { if (! cbargs->is_split) { nlpt = notice_listptr (section_loc, &known_locsptr, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); } else nlpt = true; } else { /* Only register for a real section offset. Otherwise it is a DW_FORM_loclistx which is just an index number and we should already have registered the section offset for the index when we saw the DW_AT_loclists_base CU attribute. */ if (form == DW_FORM_sec_offset) nlpt = notice_listptr (section_loc, &known_loclistsptr, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); else nlpt = true; } if (!cbargs->silent) { if (cbargs->cu->version < 5 || form == DW_FORM_sec_offset) fprintf (out, " %*s%-20s (%s) location list [%6" PRIxMAX "]%s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num, nlpt ? "" : " <WARNING offset too big>"); else fprintf (out, " %*s%-20s (%s) location index [%6" PRIxMAX "]\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num); } } return DWARF_CB_OK; case DW_AT_loclists_base: { bool nlpt = notice_listptr (section_loc, &known_loclistsptr, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); if (!cbargs->silent) fprintf (out, " %*s%-20s (%s) location list [%6" PRIxMAX "]%s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num, nlpt ? "" : " <WARNING offset too big>"); } return DWARF_CB_OK; case DW_AT_ranges: case DW_AT_start_scope: { bool nlpt; if (cbargs->cu->version < 5) nlpt = notice_listptr (section_ranges, &known_rangelistptr, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); else { /* Only register for a real section offset. Otherwise it is a DW_FORM_rangelistx which is just an index number and we should already have registered the section offset for the index when we saw the DW_AT_rnglists_base CU attribute. */ if (form == DW_FORM_sec_offset) nlpt = notice_listptr (section_ranges, &known_rnglistptr, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); else nlpt = true; } if (!cbargs->silent) { if (cbargs->cu->version < 5 || form == DW_FORM_sec_offset) fprintf (out, " %*s%-20s (%s) range list [%6" PRIxMAX "]%s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num, nlpt ? "" : " <WARNING offset too big>"); else fprintf (out, " %*s%-20s (%s) range index [%6" PRIxMAX "]\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num); } } return DWARF_CB_OK; case DW_AT_rnglists_base: { bool nlpt = notice_listptr (section_ranges, &known_rnglistptr, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); if (!cbargs->silent) fprintf (out, " %*s%-20s (%s) range list [%6" PRIxMAX "]%s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num, nlpt ? "" : " <WARNING offset too big>"); } return DWARF_CB_OK; case DW_AT_addr_base: case DW_AT_GNU_addr_base: { bool addrbase = notice_listptr (section_addr, &known_addrbases, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); if (!cbargs->silent) fprintf (out, " %*s%-20s (%s) address base [%6" PRIxMAX "]%s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num, addrbase ? "" : " <WARNING offset too big>"); } return DWARF_CB_OK; case DW_AT_str_offsets_base: { bool stroffbase = notice_listptr (section_str, &known_stroffbases, cbargs->addrsize, cbargs->offset_size, cbargs->cu, num, attr); if (!cbargs->silent) fprintf (out, " %*s%-20s (%s) str offsets base [%6" PRIxMAX "]%s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num, stroffbase ? "" : " <WARNING offset too big>"); } return DWARF_CB_OK; case DW_AT_language: valuestr = dwarf_lang_name (num); break; case DW_AT_language_name: valuestr = dwarf_lname_name (num); break; case DW_AT_encoding: valuestr = dwarf_encoding_name (num); break; case DW_AT_accessibility: valuestr = dwarf_access_name (num); break; case DW_AT_defaulted: valuestr = dwarf_defaulted_name (num); break; case DW_AT_visibility: valuestr = dwarf_visibility_name (num); break; case DW_AT_virtuality: valuestr = dwarf_virtuality_name (num); break; case DW_AT_identifier_case: valuestr = dwarf_identifier_case_name (num); break; case DW_AT_calling_convention: valuestr = dwarf_calling_convention_name (num); break; case DW_AT_inline: valuestr = dwarf_inline_name (num); break; case DW_AT_ordering: valuestr = dwarf_ordering_name (num); break; case DW_AT_decl_file: case DW_AT_call_file: { if (cbargs->silent) break; /* Try to get the actual file, the current interface only gives us full paths, but we only want to show the file name for now. */ Dwarf_Die cudie; if (dwarf_cu_die (cbargs->cu, &cudie, NULL, NULL, NULL, NULL, NULL, NULL) != NULL) { Dwarf_Files *files; size_t nfiles; if (dwarf_getsrcfiles (&cudie, &files, &nfiles) == 0) { valuestr = dwarf_filesrc (files, num, NULL, NULL); if (valuestr != NULL) { const char *filename = strrchr (valuestr, '/'); if (filename != NULL) valuestr = filename + 1; } else error (0, 0, _("invalid file (%" PRId64 "): %s"), num, dwarf_errmsg (-1)); } else error (0, 0, _("no srcfiles for CU [%" PRIx64 "]"), dwarf_dieoffset (&cudie)); } else error (0, 0, _("couldn't get DWARF CU: %s"), dwarf_errmsg (-1)); if (valuestr == NULL) valuestr = "???"; } break; case DW_AT_GNU_dwo_id: as_hex_id = true; break; default: /* Nothing. */ break; } if (cbargs->silent) break; /* When highpc is in constant form it is relative to lowpc. In that case also show the address. */ Dwarf_Addr highpc; if (attr == DW_AT_high_pc && dwarf_highpc (die, &highpc) == 0) { fprintf (out, " %*s%-20s (%s) %" PRIuMAX " (", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), (uintmax_t) num); print_dwarf_addr (cbargs->dwflmod, cbargs->addrsize, highpc, highpc, out); fprintf (out, ")\n"); } else { if (as_hex_id) { fprintf (out, " %*s%-20s (%s) 0x%.16" PRIx64 "\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), num); } else { Dwarf_Sword snum = 0; bool is_signed; int bytes = 0; if (attr == DW_AT_const_value) die_type_sign_bytes (die, &is_signed, &bytes); else is_signed = (form == DW_FORM_sdata || form == DW_FORM_implicit_const); if (is_signed) if (unlikely (dwarf_formsdata (attrp, &snum) != 0)) goto attrval_out; if (valuestr == NULL) { fprintf (out, " %*s%-20s (%s) ", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form)); } else { fprintf (out, " %*s%-20s (%s) %s (", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), valuestr); } switch (bytes) { case 1: if (is_signed) fprintf (out, "%" PRId8, (int8_t) snum); else fprintf (out, "%" PRIu8, (uint8_t) num); break; case 2: if (is_signed) fprintf (out, "%" PRId16, (int16_t) snum); else fprintf (out, "%" PRIu16, (uint16_t) num); break; case 4: if (is_signed) fprintf (out, "%" PRId32, (int32_t) snum); else fprintf (out, "%" PRIu32, (uint32_t) num); break; case 8: if (is_signed) fprintf (out, "%" PRId64, (int64_t) snum); else fprintf (out, "%" PRIu64, (uint64_t) num); break; default: if (is_signed) fprintf (out, "%" PRIdMAX, (intmax_t) snum); else fprintf (out, "%" PRIuMAX, (uintmax_t) num); break; } /* Make clear if we switched from a signed encoding to an unsigned value. */ if (attr == DW_AT_const_value && (form == DW_FORM_sdata || form == DW_FORM_implicit_const) && !is_signed) fprintf (out, " (%" PRIdMAX ")", (intmax_t) num); if (valuestr == NULL) fprintf (out, "\n"); else fprintf (out, ")\n"); } } break; case DW_FORM_flag: if (cbargs->silent) break; bool flag; if (unlikely (dwarf_formflag (attrp, &flag) != 0)) goto attrval_out; fprintf (out, " %*s%-20s (%s) %s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), flag ? yes_str : no_str); break; case DW_FORM_flag_present: if (cbargs->silent) break; fprintf (out, " %*s%-20s (%s) %s\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form), yes_str); break; case DW_FORM_exprloc: case DW_FORM_block4: case DW_FORM_block2: case DW_FORM_block1: case DW_FORM_block: case DW_FORM_data16: /* DWARF5 calls this a constant class. */ if (cbargs->silent) break; Dwarf_Block block; if (unlikely (dwarf_formblock (attrp, &block) != 0)) goto attrval_out; fprintf (out, " %*s%-20s (%s) ", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form)); switch (attr) { default: if (form != DW_FORM_exprloc) { print_block (block.length, block.data, out); break; } FALLTHROUGH; case DW_AT_location: case DW_AT_data_location: case DW_AT_data_member_location: case DW_AT_vtable_elem_location: case DW_AT_string_length: case DW_AT_use_location: case DW_AT_frame_base: case DW_AT_return_addr: case DW_AT_static_link: case DW_AT_allocated: case DW_AT_associated: case DW_AT_bit_size: case DW_AT_bit_offset: case DW_AT_bit_stride: case DW_AT_byte_size: case DW_AT_byte_stride: case DW_AT_count: case DW_AT_lower_bound: case DW_AT_upper_bound: case DW_AT_GNU_call_site_value: case DW_AT_GNU_call_site_data_value: case DW_AT_GNU_call_site_target: case DW_AT_GNU_call_site_target_clobbered: if (form == DW_FORM_exprloc || (form != DW_FORM_data16 && attrp->cu->version < 4)) /* blocks were expressions. */ { fputc ('\n', out); print_ops (cbargs->dwflmod, cbargs->dbg, 12 + level * 2, 12 + level * 2, cbargs->version, cbargs->addrsize, cbargs->offset_size, attrp->cu, block.length, block.data, out); } else print_block (block.length, block.data, out); break; case DW_AT_discr_list: if (block.length == 0) fputs ("<default>\n", out); else if (form != DW_FORM_data16) { const unsigned char *readp = block.data; const unsigned char *readendp = readp + block.length; /* See if we are dealing with a signed or unsigned values. If the parent of this variant DIE is a variant_part then it will either have a discriminant which points to the member which type is the discriminant type. Or the variant_part itself has a type representing the discriminant. */ bool is_signed = false; if (level > 0) { Dwarf_Die *parent = &cbargs->dies[level - 1]; if (dwarf_tag (die) == DW_TAG_variant && dwarf_tag (parent) == DW_TAG_variant_part) { Dwarf_Die member; Dwarf_Attribute discr_attr; int bytes; if (dwarf_formref_die (dwarf_attr (parent, DW_AT_discr, &discr_attr), &member) != NULL) die_type_sign_bytes (&member, &is_signed, &bytes); else die_type_sign_bytes (parent, &is_signed, &bytes); } } while (readp < readendp) { int d = (int) *readp++; fprintf (out, "%s ", dwarf_discr_list_name (d)); if (readp >= readendp) goto attrval_out; Dwarf_Word val; Dwarf_Sword sval; if (d == DW_DSC_label) { if (is_signed) { get_sleb128 (sval, readp, readendp); fprintf (out, "%" PRId64 "", sval); } else { get_uleb128 (val, readp, readendp); fprintf (out, "%" PRIu64 "", val); } } else if (d == DW_DSC_range) { if (is_signed) { get_sleb128 (sval, readp, readendp); fprintf (out, "%" PRId64 "..", sval); if (readp >= readendp) goto attrval_out; get_sleb128 (sval, readp, readendp); fprintf (out, "%" PRId64 "", sval); } else { get_uleb128 (val, readp, readendp); fprintf (out, "%" PRIu64 "..", val); if (readp >= readendp) goto attrval_out; get_uleb128 (val, readp, readendp); fprintf (out, "%" PRIu64 "", val); } } else { print_block (readendp - readp, readp, out); break; } if (readp < readendp) fprintf (out, ", "); } fputc ('\n', out); } else print_block (block.length, block.data, out); break; } break; default: if (cbargs->silent) break; fprintf (out, " %*s%-20s (%s) ???\n", (int) (level * 2), "", dwarf_attr_name (attr), dwarf_form_name (form)); break; } return DWARF_CB_OK; } static void print_debug_units (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, bool debug_types, FILE *out) { const bool silent = !(print_debug_sections & section_info) && !debug_types; const char *secname = section_name (ebl, shdr); /* Check section actually exists. */ if (!silent) if (get_debug_elf_data (dbg, ebl, debug_types ? IDX_debug_types : IDX_debug_info, scn) == NULL) return; if (!silent) fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n [Offset]\n"), elf_ndxscn (scn), secname, (uint64_t) shdr->sh_offset); /* If the section is empty we don't have to do anything. */ if (!silent && shdr->sh_size == 0) return; int maxdies = 20; Dwarf_Die *dies = xmalloc (maxdies * sizeof (Dwarf_Die)); /* New compilation unit. */ Dwarf_Half version; Dwarf_Die result; Dwarf_Off abbroffset; uint8_t addrsize; uint8_t offsize; uint64_t unit_id; Dwarf_Off subdie_off; int unit_res; Dwarf_CU *cu; Dwarf_CU cu_mem; uint8_t unit_type; Dwarf_Die cudie; /* We cheat a little because we want to see only the CUs from .debug_info or .debug_types. We know the Dwarf_CU struct layout. Set it up at the end of .debug_info if we want .debug_types only. Check the returned Dwarf_CU is still in the expected section. */ if (debug_types) { cu_mem.dbg = dbg; cu_mem.end = dbg->sectiondata[IDX_debug_info]->d_size; cu_mem.sec_idx = IDX_debug_info; cu = &cu_mem; } else cu = NULL; next_cu: unit_res = dwarf_get_units (dbg, cu, &cu, &version, &unit_type, &cudie, NULL); if (unit_res == 1) goto do_return; if (unit_res == -1) { if (!silent) error (0, 0, _("cannot get next unit: %s"), dwarf_errmsg (-1)); goto do_return; } if (cu->sec_idx != (size_t) (debug_types ? IDX_debug_types : IDX_debug_info)) goto do_return; dwarf_cu_die (cu, &result, NULL, &abbroffset, &addrsize, &offsize, &unit_id, &subdie_off); if (!silent) { Dwarf_Off offset = cu->start; if (debug_types && version < 5) { Dwarf_Die typedie; Dwarf_Off dieoffset; dieoffset = dwarf_dieoffset (dwarf_offdie_types (dbg, cu->start + subdie_off, &typedie)); fprintf (out, " %s %" PRIu64 ":\n" " %s: %" PRIu16 ", %s: %" PRIu64 ", %s: %" PRIu8 ", %s: %" PRIu8 "\n %s: %#" PRIx64 ", %s: %#" PRIx64 " [%" PRIx64 "]\n", type_unit_str, (uint64_t) offset, version_str, version, abbrev_offset_str, abbroffset, addr_size_str, addrsize, offset_size_str, offsize, type_sig_str, unit_id, type_offset_str, (uint64_t) subdie_off, dieoffset); } else { fprintf (out, " %s %" PRIu64 ":\n" " %s: %" PRIu16 ", %s: %" PRIu64 ", %s: %" PRIu8 ", %s: %" PRIu8 "\n", cu_offset_at_str, (uint64_t) offset, version_str, version, abbrev_offset_str, abbroffset, addr_size_str, addrsize, offset_size_str, offsize); if (version >= 5 || (unit_type != DW_UT_compile && unit_type != DW_UT_partial)) { fprintf (out, " %s: %s (%" PRIu8 ")", unit_type_str, dwarf_unit_name (unit_type), unit_type); if (unit_type == DW_UT_type || unit_type == DW_UT_skeleton || unit_type == DW_UT_split_compile || unit_type == DW_UT_split_type) fprintf (out, ", %s: 0x%.16" PRIx64 "", unit_id_str, unit_id); if (unit_type == DW_UT_type || unit_type == DW_UT_split_type) { Dwarf_Die typedie; Dwarf_Off dieoffset; dwarf_cu_info (cu, NULL, NULL, NULL, &typedie, NULL, NULL, NULL); dieoffset = dwarf_dieoffset (&typedie); fprintf (out, ", %s: %#" PRIx64 " [%" PRIx64 "]", unit_die_off_str, subdie_off, dieoffset); } fprintf (out, "\n"); } } } if (version < 2 || version > 5 || unit_type < DW_UT_compile || unit_type > DW_UT_split_type) { if (!silent) error (0, 0, _("unknown version (%d) or unit type (%d)"), version, unit_type); goto next_cu; } struct attrcb_args args = { .dwflmod = dwflmod, .silent = silent, .version = version, .addrsize = addrsize, .offset_size = offsize }; bool is_split = false; int level = 0; dies[0] = cudie; args.cu = dies[0].cu; args.dbg = dbg; args.is_split = is_split; args.out = out; /* We might return here again for the split CU subdie. */ do_cu: do { Dwarf_Off offset = dwarf_dieoffset (&dies[level]); if (unlikely (offset == (Dwarf_Off) -1)) { if (!silent) error (0, 0, _("cannot get DIE offset: %s"), dwarf_errmsg (-1)); goto do_return; } int tag = dwarf_tag (&dies[level]); if (unlikely (tag == DW_TAG_invalid)) { if (!silent) error (0, 0, _("cannot get tag of DIE at offset [%" PRIx64 "] in section '%s': %s"), (uint64_t) offset, secname, dwarf_errmsg (-1)); goto do_return; } if (!silent) { unsigned int code = dwarf_getabbrevcode (dies[level].abbrev); if (is_split) fprintf (out, " {%6" PRIx64 "} ", (uint64_t) offset); else fprintf (out, " [%6" PRIx64 "] ", (uint64_t) offset); fprintf (out, "%*s%-20s abbrev: %u\n", (int) (level * 2), "", dwarf_tag_name (tag), code); } /* Print the attribute values. */ args.level = level; args.dies = dies; (void) dwarf_getattrs (&dies[level], attr_callback, &args, 0); /* Make room for the next level's DIE. */ if (level + 1 == maxdies) dies = xrealloc (dies, (maxdies += 10) * sizeof (Dwarf_Die)); int res = dwarf_child (&dies[level], &dies[level + 1]); if (res > 0) { while ((res = dwarf_siblingof (&dies[level], &dies[level])) == 1) if (level-- == 0) break; if (unlikely (res == -1)) { if (!silent) error (0, 0, _("cannot get next DIE: %s\n"), dwarf_errmsg (-1)); goto do_return; } } else if (unlikely (res < 0)) { if (!silent) error (0, 0, _("cannot get next DIE: %s"), dwarf_errmsg (-1)); goto do_return; } else ++level; } while (level >= 0); /* We might want to show the split compile unit if this was a skeleton. We need to scan it if we are requesting printing .debug_ranges for DWARF4 since GNU DebugFission uses "offsets" into the main ranges section. */ if (unit_type == DW_UT_skeleton && ((!silent && show_split_units) || (version < 5 && (print_debug_sections & section_ranges) != 0))) { Dwarf_Die subdie; if (dwarf_cu_info (cu, NULL, NULL, NULL, &subdie, NULL, NULL, NULL) != 0 || dwarf_tag (&subdie) == DW_TAG_invalid) { if (!silent) { Dwarf_Attribute dwo_at; const char *dwo_name = (dwarf_formstring (dwarf_attr (&cudie, DW_AT_dwo_name, &dwo_at)) ?: (dwarf_formstring (dwarf_attr (&cudie, DW_AT_GNU_dwo_name, &dwo_at)) ?: "<unknown>")); fprintf (stderr, "Could not find split unit '%s', id: %" PRIx64 "\n", dwo_name, unit_id); } } else { Dwarf_CU *split_cu = subdie.cu; Dwarf_Half split_version; /* Should be the same version as skel. */ dwarf_cu_die (split_cu, &result, &split_version, &abbroffset, &addrsize, &offsize, &unit_id, &subdie_off); Dwarf_Off offset = cu->start; uint8_t split_unit_type; /* Should be DW_UT_split_compile. */ uint64_t split_unit_id; /* Should be the same as id. */ if (dwarf_cu_info (split_cu, NULL, &split_unit_type, NULL, NULL, &split_unit_id, NULL, NULL) != 0) { /* Really shouldn't happen unless split_cu is NULL. */ split_unit_type = DW_UT_split_compile; split_unit_id = unit_id; } if (!silent) { fprintf (out, _(" Split compilation unit at offset %" PRIu64 ":\n" " Version: %" PRIu16 ", Abbreviation section offset: %" PRIu64 ", Address size: %" PRIu8 ", Offset size: %" PRIu8 "\n"), (uint64_t) offset, split_version, abbroffset, addrsize, offsize); fprintf (out, _(" Unit type: %s (%" PRIu8 ")"), dwarf_unit_name (split_unit_type), split_unit_type); fprintf (out, ", Unit id: 0x%.16" PRIx64 "", split_unit_id); fprintf (out, "\n"); } unit_type = split_unit_type; is_split = true; level = 0; dies[0] = subdie; args.cu = dies[0].cu; args.dbg = split_cu->dbg; args.is_split = is_split; goto do_cu; } } /* And again... */ goto next_cu; do_return: free (dies); } static void print_debug_info_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { print_debug_units (dwflmod, ebl, ehdr, scn, shdr, dbg, false, out); } static void print_debug_types_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { print_debug_units (dwflmod, ebl, ehdr, scn, shdr, dbg, true, out); } static void print_decoded_line_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); size_t address_size = elf_getident (ebl->elf, NULL)[EI_CLASS] == ELFCLASS32 ? 4 : 8; Dwarf_Lines *lines; size_t nlines; Dwarf_Off off, next_off = 0; Dwarf_CU *cu = NULL; while (dwarf_next_lines (dbg, off = next_off, &next_off, &cu, NULL, NULL, &lines, &nlines) == 0) { Dwarf_Die cudie; if (cu != NULL && dwarf_cu_info (cu, NULL, NULL, &cudie, NULL, NULL, NULL, NULL) == 0) fprintf (out, " CU [%" PRIx64 "] %s\n", dwarf_dieoffset (&cudie), dwarf_diename (&cudie)); else { /* DWARF5 lines can be independent of any CU, but they probably are used by some CU. Determine the CU this block is for. */ Dwarf_Off cuoffset; Dwarf_Off ncuoffset = 0; size_t hsize; while (dwarf_nextcu (dbg, cuoffset = ncuoffset, &ncuoffset, &hsize, NULL, NULL, NULL) == 0) { if (dwarf_offdie (dbg, cuoffset + hsize, &cudie) == NULL) continue; Dwarf_Attribute stmt_list; if (dwarf_attr (&cudie, DW_AT_stmt_list, &stmt_list) == NULL) continue; Dwarf_Word lineoff; if (dwarf_formudata (&stmt_list, &lineoff) != 0) continue; if (lineoff == off) { /* Found the CU. */ cu = cudie.cu; break; } } if (cu != NULL) fprintf (out, " CU [%" PRIx64 "] %s\n", dwarf_dieoffset (&cudie), dwarf_diename (&cudie)); else fprintf (out, " No CU\n"); } fprintf (out, " line:col SBPE* disc isa op address" " (Statement Block Prologue Epilogue *End)\n"); const char *last_file = ""; for (size_t n = 0; n < nlines; n++) { Dwarf_Line *line = dwarf_onesrcline (lines, n); if (line == NULL) { fprintf (out, " dwarf_onesrcline: %s\n", dwarf_errmsg (-1)); continue; } Dwarf_Word mtime, length; const char *file = dwarf_linesrc (line, &mtime, &length); if (file == NULL) { fprintf (out, " <%s> (mtime: ?, length: ?)\n", dwarf_errmsg (-1)); last_file = ""; } else if (strcmp (last_file, file) != 0) { fprintf (out, " %s (mtime: %" PRIu64 ", length: %" PRIu64 ")\n", file, mtime, length); last_file = file; } int lineno, colno; bool statement, endseq, block, prologue_end, epilogue_begin; unsigned int lineop, isa, disc; Dwarf_Addr address; dwarf_lineaddr (line, &address); dwarf_lineno (line, &lineno); dwarf_linecol (line, &colno); dwarf_lineop_index (line, &lineop); dwarf_linebeginstatement (line, &statement); dwarf_lineendsequence (line, &endseq); dwarf_lineblock (line, &block); dwarf_lineprologueend (line, &prologue_end); dwarf_lineepiloguebegin (line, &epilogue_begin); dwarf_lineisa (line, &isa); dwarf_linediscriminator (line, &disc); /* End sequence is special, it is one byte past. */ fprintf (out, " %4d:%-3d %c%c%c%c%c %4d %3d %2d ", lineno, colno, (statement ? 'S' : ' '), (block ? 'B' : ' '), (prologue_end ? 'P' : ' '), (epilogue_begin ? 'E' : ' '), (endseq ? '*' : ' '), disc, isa, lineop); print_dwarf_addr (dwflmod, address_size, address - (endseq ? 1 : 0), address, out); fprintf (out, "\n"); if (endseq) fprintf(out, "\n"); } } } /* Print the value of a form. Returns new value of readp, or readendp on failure. */ static const unsigned char * print_form_data (Dwarf *dbg, int form, const unsigned char *readp, const unsigned char *readendp, unsigned int offset_len, Dwarf_Off str_offsets_base, FILE *out) { Dwarf_Word val; const unsigned char *endp; Elf_Data *data; char *str; switch (form) { case DW_FORM_data1: if (readendp - readp < 1) { invalid_data: error (0, 0, "invalid data"); return readendp; } val = *readp++; fprintf (out, " %" PRIx8, (unsigned int) val); break; case DW_FORM_data2: if (readendp - readp < 2) goto invalid_data; val = read_2ubyte_unaligned_inc (dbg, readp); fprintf(out, " %" PRIx16, (unsigned int) val); break; case DW_FORM_data4: if (readendp - readp < 4) goto invalid_data; val = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, " %" PRIx32, (unsigned int) val); break; case DW_FORM_data8: if (readendp - readp < 8) goto invalid_data; val = read_8ubyte_unaligned_inc (dbg, readp); fprintf (out, " %" PRIx64, val); break; case DW_FORM_sdata: if (readendp - readp < 1) goto invalid_data; get_sleb128 (val, readp, readendp); fprintf (out, " %" PRIx64, val); break; case DW_FORM_udata: if (readendp - readp < 1) goto invalid_data; get_uleb128 (val, readp, readendp); fprintf (out, " %" PRIx64, val); break; case DW_FORM_block: if (readendp - readp < 1) goto invalid_data; get_uleb128 (val, readp, readendp); if ((size_t) (readendp - readp) < val) goto invalid_data; print_bytes (val, readp, out); readp += val; break; case DW_FORM_block1: if (readendp - readp < 1) goto invalid_data; val = *readp++; if ((size_t) (readendp - readp) < val) goto invalid_data; print_bytes (val, readp, out); readp += val; break; case DW_FORM_block2: if (readendp - readp < 2) goto invalid_data; val = read_2ubyte_unaligned_inc (dbg, readp); if ((size_t) (readendp - readp) < val) goto invalid_data; print_bytes (val, readp, out); readp += val; break; case DW_FORM_block4: if (readendp - readp < 4) goto invalid_data; val = read_4ubyte_unaligned_inc (dbg, readp); if ((size_t) (readendp - readp) < val) goto invalid_data; print_bytes (val, readp, out); readp += val; break; case DW_FORM_data16: if (readendp - readp < 16) goto invalid_data; print_bytes (16, readp, out); readp += 16; break; case DW_FORM_flag: if (readendp - readp < 1) goto invalid_data; val = *readp++; fprintf (out, "%s", val != 0 ? yes_str : no_str); break; case DW_FORM_string: endp = memchr (readp, '\0', readendp - readp); if (endp == NULL) goto invalid_data; fprintf (out, "%s", readp); readp = endp + 1; break; case DW_FORM_strp: case DW_FORM_line_strp: case DW_FORM_strp_sup: if ((size_t) (readendp - readp) < offset_len) goto invalid_data; if (offset_len == 8) val = read_8ubyte_unaligned_inc (dbg, readp); else val = read_4ubyte_unaligned_inc (dbg, readp); if (form == DW_FORM_strp) data = dbg->sectiondata[IDX_debug_str]; else if (form == DW_FORM_line_strp) data = dbg->sectiondata[IDX_debug_line_str]; else /* form == DW_FORM_strp_sup */ { Dwarf *alt = dwarf_getalt (dbg); data = alt != NULL ? alt->sectiondata[IDX_debug_str] : NULL; } if (data == NULL || val >= data->d_size || memchr (data->d_buf + val, '\0', data->d_size - val) == NULL) str = "???"; else str = (char *) data->d_buf + val; fprintf (out, "%s (%" PRIu64 ")", str, val); break; case DW_FORM_sec_offset: if ((size_t) (readendp - readp) < offset_len) goto invalid_data; if (offset_len == 8) val = read_8ubyte_unaligned_inc (dbg, readp); else val = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, "[%" PRIx64 "]", val); break; case DW_FORM_strx: case DW_FORM_GNU_str_index: if (readendp - readp < 1) goto invalid_data; get_uleb128 (val, readp, readendp); strx_val: data = dbg->sectiondata[IDX_debug_str_offsets]; if (data == NULL || data->d_size - str_offsets_base < val * offset_len) str = "???"; else { const unsigned char *strreadp = (data->d_buf + str_offsets_base + val * offset_len); const unsigned char *strreadendp = data->d_buf + data->d_size; if ((size_t) (strreadendp - strreadp) < offset_len) str = "???"; else { Dwarf_Off idx; if (offset_len == 8) idx = read_8ubyte_unaligned (dbg, strreadp); else idx = read_4ubyte_unaligned (dbg, strreadp); data = dbg->sectiondata[IDX_debug_str]; if (data == NULL || idx >= data->d_size || memchr (data->d_buf + idx, '\0', data->d_size - idx) == NULL) str = "???"; else str = (char *) data->d_buf + idx; } } fprintf (out, "%s (%" PRIu64 ")", str, val); break; case DW_FORM_strx1: if (readendp - readp < 1) goto invalid_data; val = *readp++; goto strx_val; case DW_FORM_strx2: if (readendp - readp < 2) goto invalid_data; val = read_2ubyte_unaligned_inc (dbg, readp); goto strx_val; case DW_FORM_strx3: if (readendp - readp < 3) goto invalid_data; val = read_3ubyte_unaligned_inc (dbg, readp); goto strx_val; case DW_FORM_strx4: if (readendp - readp < 4) goto invalid_data; val = read_4ubyte_unaligned_inc (dbg, readp); goto strx_val; default: error (0, 0, _("unknown form: %s"), dwarf_form_name (form)); return readendp; } return readp; } /* Only used via run_advance_pc() macro */ static inline void run_advance_pc (unsigned int op_advance, unsigned int minimum_instr_len, unsigned int max_ops_per_instr, unsigned int *op_addr_advance, Dwarf_Word *address, unsigned int *op_index) { const unsigned int advanced_op_index = (*op_index) + op_advance; *op_addr_advance = minimum_instr_len * (advanced_op_index / max_ops_per_instr); *address = *address + *op_addr_advance; *op_index = advanced_op_index % max_ops_per_instr; } static void print_debug_line_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { if (decodedline) { print_decoded_line_section (dwflmod, ebl, ehdr, scn, shdr, dbg, out); return; } Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_line, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); if (shdr->sh_size == 0) return; /* There is no functionality in libdw to read the information in the way it is represented here. Hardcode the decoder. */ const unsigned char *linep = (const unsigned char *) data->d_buf; const unsigned char *lineendp; while (linep < (lineendp = (const unsigned char *) data->d_buf + data->d_size)) { size_t start_offset = linep - (const unsigned char *) data->d_buf; fprintf (out, "\n%s %zu:\n", table_offset_lower_str, start_offset); if (unlikely (linep + 4 > lineendp)) goto invalid_data; Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, linep); unsigned int length = 4; if (unlikely (unit_length == 0xffffffff)) { if (unlikely (linep + 8 > lineendp)) { invalid_data: error (0, 0, _("invalid data in section [%zu] '%s'"), elf_ndxscn (scn), section_name (ebl, shdr)); return; } unit_length = read_8ubyte_unaligned_inc (dbg, linep); length = 8; } /* Check whether we have enough room in the section. */ if (unlikely (unit_length > (size_t) (lineendp - linep))) goto invalid_data; lineendp = linep + unit_length; /* The next element of the header is the version identifier. */ if ((size_t) (lineendp - linep) < 2) goto invalid_data; uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, linep); size_t address_size = elf_getident (ebl->elf, NULL)[EI_CLASS] == ELFCLASS32 ? 4 : 8; unsigned char segment_selector_size = 0; if (version > 4) { if ((size_t) (lineendp - linep) < 2) goto invalid_data; address_size = *linep++; segment_selector_size = *linep++; } /* Next comes the header length. */ Dwarf_Word header_length; if (length == 4) { if ((size_t) (lineendp - linep) < 4) goto invalid_data; header_length = read_4ubyte_unaligned_inc (dbg, linep); } else { if ((size_t) (lineendp - linep) < 8) goto invalid_data; header_length = read_8ubyte_unaligned_inc (dbg, linep); } const unsigned char *header_start = linep; /* Next the minimum instruction length. */ if ((size_t) (lineendp - linep) < 1) goto invalid_data; uint_fast8_t minimum_instr_len = *linep++; /* Next the maximum operations per instruction, in version 4 format. */ uint_fast8_t max_ops_per_instr; if (version < 4) max_ops_per_instr = 1; else { if ((size_t) (lineendp - linep) < 1) goto invalid_data; max_ops_per_instr = *linep++; } /* We need at least 4 more bytes. */ if ((size_t) (lineendp - linep) < 4) goto invalid_data; /* Then the flag determining the default value of the is_stmt register. */ uint_fast8_t default_is_stmt = *linep++; /* Now the line base. */ int_fast8_t line_base = *linep++; /* And the line range. */ uint_fast8_t line_range = *linep++; /* The opcode base. */ uint_fast8_t opcode_base = *linep++; /* Print what we got so far. */ fprintf (out, "\n" " %s: %" PRIu64 "\n" " %s: %" PRIuFAST16 "\n" " %s: %" PRIu64 "\n" " %s: %zd\n" " %s: %zd\n" " %s: %" PRIuFAST8 "\n" " %s: %" PRIuFAST8 "\n" " %s 'is_stmt': %" PRIuFAST8 "\n" " %s: %" PRIdFAST8 "\n" " %s: %" PRIuFAST8 "\n" " %s: %" PRIuFAST8 "\n" "\n" "%s:\n", length_str, (uint64_t) unit_length, dwarf_ver_str, version, prologue_len_str, (uint64_t) header_length, addr_size_str, address_size, seg_selector_str, (size_t) segment_selector_size, min_inst_len_str, minimum_instr_len, max_op_per_inst_str, max_ops_per_instr, initial_value_if_str, default_is_stmt, line_base_str, line_base, line_range_str, line_range, opcodes_base_str, opcode_base, opcodes_str); if (version < 2 || version > 5) { error (0, 0, _("cannot handle .debug_line version: %u\n"), (unsigned int) version); linep = lineendp; continue; } if (address_size != 4 && address_size != 8) { error (0, 0, _("cannot handle address size: %u\n"), (unsigned int) address_size); linep = lineendp; continue; } if (segment_selector_size != 0) { error (0, 0, _("cannot handle segment selector size: %u\n"), (unsigned int) segment_selector_size); linep = lineendp; continue; } if (unlikely (linep + opcode_base - 1 >= lineendp)) { invalid_unit: error (0, 0, _("invalid data at offset %tu in section [%zu] '%s'"), linep - (const unsigned char *) data->d_buf, elf_ndxscn (scn), section_name (ebl, shdr)); linep = lineendp; continue; } int opcode_base_l10 = 1; unsigned int tmp = opcode_base; while (tmp > 10) { tmp /= 10; ++opcode_base_l10; } const uint8_t *standard_opcode_lengths = linep - 1; for (uint_fast8_t cnt = 1; cnt < opcode_base; ++cnt) fprintf (out, ngettext (" [%*" PRIuFAST8 "] %hhu argument\n", " [%*" PRIuFAST8 "] %hhu arguments\n", (int) linep[cnt - 1]), opcode_base_l10, cnt, linep[cnt - 1]); linep += opcode_base - 1; if (unlikely (linep >= lineendp)) goto invalid_unit; Dwarf_Off str_offsets_base = str_offsets_base_off (dbg, NULL); fprintf (out, "\n%s:\n", dir_table_str); if (version > 4) { struct encpair { uint16_t desc; uint16_t form; }; struct encpair enc[256]; fprintf (out, " ["); if ((size_t) (lineendp - linep) < 1) goto invalid_data; unsigned char directory_entry_format_count = *linep++; for (int i = 0; i < directory_entry_format_count; i++) { uint16_t desc, form; if ((size_t) (lineendp - linep) < 1) goto invalid_data; get_uleb128 (desc, linep, lineendp); if ((size_t) (lineendp - linep) < 1) goto invalid_data; get_uleb128 (form, linep, lineendp); enc[i].desc = desc; enc[i].form = form; fprintf (out, "%s(%s)", dwarf_line_content_description_name (desc), dwarf_form_name (form)); if (i + 1 < directory_entry_format_count) fprintf (out, ", "); } fprintf (out, "]\n"); uint64_t directories_count; if ((size_t) (lineendp - linep) < 1) goto invalid_data; get_uleb128 (directories_count, linep, lineendp); if (directory_entry_format_count == 0 && directories_count != 0) goto invalid_data; for (uint64_t i = 0; i < directories_count; i++) { fprintf (out, " %-5" PRIu64 " ", i); for (int j = 0; j < directory_entry_format_count; j++) { linep = print_form_data (dbg, enc[j].form, linep, lineendp, length, str_offsets_base, out); if (j + 1 < directory_entry_format_count) fprintf (out, ", "); } fprintf (out, "\n"); if (linep >= lineendp) goto invalid_unit; } } else { while (linep < lineendp && *linep != 0) { const unsigned char *endp = memchr (linep, '\0', lineendp - linep); if (unlikely (endp == NULL)) goto invalid_unit; fprintf (out, " %s\n", (char *) linep); linep = endp + 1; } if (linep >= lineendp || *linep != 0) goto invalid_unit; /* Skip the final NUL byte. */ ++linep; } if (unlikely (linep >= lineendp)) goto invalid_unit; fprintf (out, "\n%s:\n", file_table_str); if (version > 4) { struct encpair { uint16_t desc; uint16_t form; }; struct encpair enc[256]; fprintf (out, " ["); if ((size_t) (lineendp - linep) < 1) goto invalid_data; unsigned char file_name_format_count = *linep++; for (int i = 0; i < file_name_format_count; i++) { uint64_t desc, form; if ((size_t) (lineendp - linep) < 1) goto invalid_data; get_uleb128 (desc, linep, lineendp); if ((size_t) (lineendp - linep) < 1) goto invalid_data; get_uleb128 (form, linep, lineendp); if (! libdw_valid_user_form (form)) goto invalid_data; enc[i].desc = desc; enc[i].form = form; fprintf (out, "%s(%s)", dwarf_line_content_description_name (desc), dwarf_form_name (form)); if (i + 1 < file_name_format_count) fprintf (out, ", "); } fprintf (out, "]\n"); uint64_t file_name_count; if ((size_t) (lineendp - linep) < 1) goto invalid_data; get_uleb128 (file_name_count, linep, lineendp); if (file_name_format_count == 0 && file_name_count != 0) goto invalid_data; for (uint64_t i = 0; i < file_name_count; i++) { fprintf (out, " %-5" PRIu64 " ", i); for (int j = 0; j < file_name_format_count; j++) { linep = print_form_data (dbg, enc[j].form, linep, lineendp, length, str_offsets_base, out); if (j + 1 < file_name_format_count) fprintf (out, ", "); } fprintf (out, "\n"); if (linep > lineendp) goto invalid_unit; } } else { fputs (_(" Entry Dir Time Size Name\n"), out); for (unsigned int cnt = 1; linep < lineendp && *linep != 0; ++cnt) { /* First comes the file name. */ char *fname = (char *) linep; unsigned char *endp = memchr (fname, '\0', lineendp - linep); if (unlikely (endp == NULL)) goto invalid_unit; linep = endp + 1; /* Then the index. */ unsigned int diridx; if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (diridx, linep, lineendp); /* Next comes the modification time. */ unsigned int mtime; if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (mtime, linep, lineendp); /* Finally the length of the file. */ unsigned int fsize; if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (fsize, linep, lineendp); fprintf (out, " %-5u %-5u %-9u %-9u %s\n", cnt, diridx, mtime, fsize, fname); } if (linep >= lineendp || *linep != '\0') goto invalid_unit; /* Skip the final NUL byte. */ ++linep; } unsigned int debug_str_offset = 0; if (unlikely (linep == header_start + header_length - 4)) { /* CUBINs contain an unsigned 4-byte offset */ debug_str_offset = read_4ubyte_unaligned_inc (dbg, linep); } if (linep == lineendp) { fprintf (out, "\n%s.\n", no_line_num_stmts_str); continue; } fprintf (out, "\n%s:\n", line_num_stmts_str); Dwarf_Word address = 0; unsigned int op_index = 0; size_t line = 1; uint_fast8_t is_stmt = default_is_stmt; /* Apply the "operation advance" from a special opcode or DW_LNS_advance_pc (as per DWARF4 6.2.5.1). */ unsigned int op_addr_advance; #define advance_pc(op_advance) run_advance_pc(op_advance, minimum_instr_len, \ max_ops_per_instr, &op_addr_advance, &address, &op_index) if (max_ops_per_instr == 0) { error (0, 0, _("invalid maximum operations per instruction is zero")); linep = lineendp; continue; } while (linep < lineendp) { size_t offset = linep - (const unsigned char *) data->d_buf; unsigned int u128; int s128; /* Read the opcode. */ unsigned int opcode = *linep++; fprintf (out, " [%6" PRIx64 "]", (uint64_t)offset); /* Is this a special opcode? */ if (likely (opcode >= opcode_base)) { if (unlikely (line_range == 0)) goto invalid_unit; /* Yes. Handling this is quite easy since the opcode value is computed with opcode = (desired line increment - line_base) + (line_range * address advance) + opcode_base */ int line_increment = (line_base + (opcode - opcode_base) % line_range); /* Perform the increments. */ line += line_increment; advance_pc ((opcode - opcode_base) / line_range); fprintf (out, " %s %u: %s+%u = ", special_opcode_str, opcode, address_str, op_addr_advance); print_dwarf_addr (dwflmod, 0, address, address, out); if (op_index > 0) fprintf (out, ", op_index = %u, %s%+d = %zu\n", op_index, line_str, line_increment, line); else fprintf (out, ", %s%+d = %zu\n", line_str, line_increment, line); } else if (opcode == 0) { /* This an extended opcode. */ if (unlikely (linep + 2 > lineendp)) goto invalid_unit; /* The length. */ unsigned int len = *linep++; if (unlikely (linep + len > lineendp)) goto invalid_unit; /* The sub-opcode. */ opcode = *linep++; fprintf (out, " %s %u: ", ext_opcode_str, opcode); switch (opcode) { case DW_LNE_end_sequence: fprintf (out, " %s\n", end_of_seq_str); /* Reset the registers we care about. */ address = 0; op_index = 0; line = 1; is_stmt = default_is_stmt; break; case DW_LNE_set_address: op_index = 0; if (unlikely ((size_t) (lineendp - linep) < address_size)) goto invalid_unit; if (address_size == 4) address = read_4ubyte_unaligned_inc (dbg, linep); else address = read_8ubyte_unaligned_inc (dbg, linep); { fprintf (out, " %s ", set_addr_to_str); print_dwarf_addr (dwflmod, 0, address, address, out); fprintf (out, "\n"); } break; case DW_LNE_define_file: { char *fname = (char *) linep; const unsigned char *endp = memchr (linep, '\0', lineendp - linep); if (unlikely (endp == NULL)) goto invalid_unit; linep = endp + 1; unsigned int diridx; if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (diridx, linep, lineendp); Dwarf_Word mtime; if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (mtime, linep, lineendp); Dwarf_Word filelength; if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (filelength, linep, lineendp); fprintf (out, _("\ define new file: dir=%u, mtime=%" PRIu64 ", length=%" PRIu64 ", name=%s\n"), diridx, (uint64_t) mtime, (uint64_t) filelength, fname); } break; case DW_LNE_set_discriminator: /* Takes one ULEB128 parameter, the discriminator. */ if (unlikely (standard_opcode_lengths[opcode] != 1 || lineendp - linep < 1)) goto invalid_unit; get_uleb128 (u128, linep, lineendp); fprintf (out, " %s %u\n", set_disc_str, u128); break; case DW_LNE_NVIDIA_inlined_call: { if (unlikely (linep >= lineendp)) goto invalid_data; unsigned int context; get_uleb128 (context, linep, lineendp); if (unlikely (linep >= lineendp)) goto invalid_data; unsigned int function_name; get_uleb128 (function_name, linep, lineendp); function_name += debug_str_offset; Elf_Data *str_data = dbg->sectiondata[IDX_debug_str]; char *function_str; if (str_data == NULL || function_name >= str_data->d_size || memchr (str_data->d_buf + function_name, '\0', str_data->d_size - function_name) == NULL) function_str = "???"; else function_str = (char *) str_data->d_buf + function_name; fprintf (out, _(" set inlined context %u," " function name %s (0x%x)\n"), context, function_str, function_name); break; } case DW_LNE_NVIDIA_set_function_name: { if (unlikely (linep >= lineendp)) goto invalid_data; unsigned int function_name; get_uleb128 (function_name, linep, lineendp); function_name += debug_str_offset; Elf_Data *str_data = dbg->sectiondata[IDX_debug_str]; char *function_str; if (str_data == NULL || function_name >= str_data->d_size || memchr (str_data->d_buf + function_name, '\0', str_data->d_size - function_name) == NULL) function_str = "???"; else function_str = (char *) str_data->d_buf + function_name; fprintf (out, _(" set function name %s (0x%x)\n"), function_str, function_name); } break; default: /* Unknown, ignore it. */ fputs (_(" unknown opcode\n"), out); linep += len - 1; break; } } else if (opcode <= DW_LNS_set_isa) { /* This is a known standard opcode. */ switch (opcode) { case DW_LNS_copy: /* Takes no argument. */ fprintf (out, " %s\n", copy_str); break; case DW_LNS_advance_pc: /* Takes one uleb128 parameter which is added to the address. */ if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (u128, linep, lineendp); advance_pc (u128); { fprintf (out, " %s %u %s ", adv_addr_str, op_addr_advance, to_str); print_dwarf_addr (dwflmod, 0, address, address, out); if (op_index > 0) fprintf (out, ", op_index %s %u", to_str, op_index); fprintf (out, "\n"); } break; case DW_LNS_advance_line: /* Takes one sleb128 parameter which is added to the line. */ if (lineendp - linep < 1) goto invalid_unit; get_sleb128 (s128, linep, lineendp); line += s128; fprintf (out, "\ %s %d to %" PRId64 "\n", adv_line_by_str, s128, (int64_t) line); break; case DW_LNS_set_file: /* Takes one uleb128 parameter which is stored in file. */ if (lineendp - linep < 1) goto invalid_unit; get_uleb128 (u128, linep, lineendp); fprintf (out, " %s %" PRIu64 "\n", set_file_str, (uint64_t) u128); break; case DW_LNS_set_column: /* Takes one uleb128 parameter which is stored in column. */ if (unlikely (standard_opcode_lengths[opcode] != 1 || lineendp - linep < 1)) goto invalid_unit; get_uleb128 (u128, linep, lineendp); fprintf (out, " %s %" PRIu64 "\n", set_col_str, (uint64_t) u128); break; case DW_LNS_negate_stmt: /* Takes no argument. */ is_stmt = 1 - is_stmt; fprintf (out, " %s '%s' %s %" PRIuFAST8 "\n", set_str, "is_stmt", to_str, is_stmt); break; case DW_LNS_set_basic_block: /* Takes no argument. */ fputs (_(" set basic block flag\n"), out); break; case DW_LNS_const_add_pc: /* Takes no argument. */ if (unlikely (line_range == 0)) goto invalid_unit; advance_pc ((255 - opcode_base) / line_range); { fprintf (out, " %s %u to ", adv_addr_by_str, op_addr_advance); print_dwarf_addr (dwflmod, 0, address, address, out); if (op_index > 0) fprintf (out, _(", op_index to %u"), op_index); fprintf (out, "\n"); } break; case DW_LNS_fixed_advance_pc: /* Takes one 16 bit parameter which is added to the address. */ if (unlikely (standard_opcode_lengths[opcode] != 1 || lineendp - linep < 2)) goto invalid_unit; u128 = read_2ubyte_unaligned_inc (dbg, linep); address += u128; op_index = 0; { fprintf (out, _("\ advance address by fixed value %u to \n"), u128); print_dwarf_addr (dwflmod, 0, address, address, out); fprintf (out, "\n"); } break; case DW_LNS_set_prologue_end: /* Takes no argument. */ fputs (_(" set prologue end flag\n"), out); break; case DW_LNS_set_epilogue_begin: /* Takes no argument. */ fputs (_(" set epilogue begin flag\n"), out); break; case DW_LNS_set_isa: /* Takes one uleb128 parameter which is stored in isa. */ if (unlikely (standard_opcode_lengths[opcode] != 1 || lineendp - linep < 1)) goto invalid_unit; get_uleb128 (u128, linep, lineendp); fprintf (out, _(" set isa to %u\n"), u128); break; } } else { /* This is a new opcode the generator but not we know about. Read the parameters associated with it but then discard everything. Read all the parameters for this opcode. */ fprintf (out, ngettext (" unknown opcode with %" PRIu8 " parameter:", " unknown opcode with %" PRIu8 " parameters:", standard_opcode_lengths[opcode]), standard_opcode_lengths[opcode]); for (int n = standard_opcode_lengths[opcode]; n > 0 && linep < lineendp; --n) { get_uleb128 (u128, linep, lineendp); if (n != standard_opcode_lengths[opcode]) fputc (',', out); fprintf (out, " %u", u128); } /* Next round, ignore this opcode. */ continue; } } } /* There must only be one data block. */ assert (elf_getdata (scn, data) == NULL); } static void print_debug_loclists_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_loclists, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); /* For the listptr to get the base address/CU. */ sort_listptr (&known_loclistsptr, "loclistsptr"); size_t listptr_idx = 0; const unsigned char *readp = data->d_buf; const unsigned char *const dataend = ((unsigned char *) data->d_buf + data->d_size); while (readp < dataend) { if (unlikely (readp > dataend - 4)) { invalid_data: error (0, 0, _("invalid data in section [%zu] '%s'"), elf_ndxscn (scn), section_name (ebl, shdr)); return; } ptrdiff_t offset = readp - (unsigned char *) data->d_buf; fprintf (out, "%s 0x%" PRIx64 ":\n\n", table_offset_upper_str, (uint64_t) offset); uint64_t unit_length = read_4ubyte_unaligned_inc (dbg, readp); unsigned int offset_size = 4; if (unlikely (unit_length == 0xffffffff)) { if (unlikely (readp > dataend - 8)) goto invalid_data; unit_length = read_8ubyte_unaligned_inc (dbg, readp); offset_size = 8; } fprintf (out, " %s: %8" PRIu64 "\n", length_str, unit_length); /* We need at least 2-bytes + 1-byte + 1-byte + 4-bytes = 8 bytes to complete the header. And this unit cannot go beyond the section data. */ if (readp > dataend - 8 || unit_length < 8 || unit_length > (uint64_t) (dataend - readp)) goto invalid_data; const unsigned char *nexthdr = readp + unit_length; uint16_t version = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, " %s: %8" PRIu16 "\n", dwarf_ver_str, version); if (version != 5) { error (0, 0, _("Unknown version")); goto next_table; } uint8_t address_size = *readp++; fprintf (out, " %s: %8" PRIu64 "\n", addr_size_str, (uint64_t) address_size); if (address_size != 4 && address_size != 8) { error (0, 0, _("unsupported address size")); goto next_table; } uint8_t segment_size = *readp++; fprintf (out, " %s: %8" PRIu64 "\n", seg_size_str, (uint64_t) segment_size); if (segment_size != 0) { error (0, 0, _("unsupported segment size")); goto next_table; } uint32_t offset_entry_count = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, " %s: %8" PRIu64 "\n", offset_ent_str, (uint64_t) offset_entry_count); /* We need the CU that uses this unit to get the initial base address. */ Dwarf_Addr cu_base = 0; struct Dwarf_CU *cu = NULL; if (listptr_cu (&known_loclistsptr, &listptr_idx, (Dwarf_Off) offset, (Dwarf_Off) (nexthdr - (unsigned char *) data->d_buf), &cu_base, &cu) || split_dwarf_cu_base (dbg, &cu, &cu_base)) { Dwarf_Die cudie; if (dwarf_cu_die (cu, &cudie, NULL, NULL, NULL, NULL, NULL, NULL) == NULL) fprintf (out, " %s: ", unknown_base_str); else fprintf (out, " %s [%6" PRIx64 "] %s: ", cu_str, dwarf_dieoffset (&cudie), base_str); print_dwarf_addr (dwflmod, address_size, cu_base, cu_base, out); fprintf (out, "\n"); } else fprintf (out, _(" Not associated with a CU.\n")); fprintf (out, "\n"); const unsigned char *offset_array_start = readp; if (offset_entry_count > 0) { uint64_t max_entries = (unit_length - 8) / offset_size; if (offset_entry_count > max_entries) { error (0, 0, _("too many offset entries for unit length")); offset_entry_count = max_entries; } fprintf (out, _(" Offsets starting at 0x%" PRIx64 ":\n"), (uint64_t) (offset_array_start - (unsigned char *) data->d_buf)); for (uint32_t idx = 0; idx < offset_entry_count; idx++) { fprintf (out, " [%6" PRIu32 "] ", idx); if (offset_size == 4) { uint32_t off = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, "0x%" PRIx32 "\n", off); } else { uint64_t off = read_8ubyte_unaligned_inc (dbg, readp); fprintf (out, "0x%" PRIx64 "\n", off); } } fprintf (out, "\n"); } Dwarf_Addr base = cu_base; bool start_of_list = true; while (readp < nexthdr) { Dwarf_Off off = (Dwarf_Off) (readp - (unsigned char *) data->d_buf); if (listptr_attr (&known_loclistsptr, listptr_idx, off, DW_AT_GNU_locviews)) { Dwarf_Off next_off = next_listptr_offset (&known_loclistsptr, &listptr_idx, off); const unsigned char *locp = readp; const unsigned char *locendp; if (next_off == 0 || next_off > (size_t) (nexthdr - ((const unsigned char *) data->d_buf))) locendp = nexthdr; else locendp = (const unsigned char *) data->d_buf + next_off; fprintf (out, " Offset: %" PRIx64 ", Index: %" PRIx64 "\n", (uint64_t) (readp - (unsigned char *) data->d_buf), (uint64_t) (readp - offset_array_start)); while (locp < locendp) { uint64_t v1, v2; get_uleb128 (v1, locp, locendp); if (locp >= locendp) { fprintf (out, _(" <INVALID DATA>\n")); break; } get_uleb128 (v2, locp, locendp); fprintf (out, " view pair %" PRId64 ", %" PRId64 "\n", v1, v2); } fprintf (out, "\n"); readp = (unsigned char *) locendp; continue; } uint8_t kind = *readp++; uint64_t op1, op2, len; /* Skip padding. */ if (start_of_list && kind == DW_LLE_end_of_list) continue; if (start_of_list) { base = cu_base; fprintf (out, " Offset: %" PRIx64 ", Index: %" PRIx64 "\n", (uint64_t) (readp - (unsigned char *) data->d_buf - 1), (uint64_t) (readp - offset_array_start - 1)); start_of_list = false; } fprintf (out, " %s", dwarf_loc_list_encoding_name (kind)); switch (kind) { case DW_LLE_end_of_list: start_of_list = true; fprintf (out, "\n\n"); break; case DW_LLE_base_addressx: if ((uint64_t) (nexthdr - readp) < 1) { invalid_entry: error (0, 0, _("invalid loclists data")); goto next_table; } get_uleb128 (op1, readp, nexthdr); fprintf (out, " %" PRIx64 "\n", op1); if (! print_unresolved_addresses) { Dwarf_Addr addr; if (get_indexed_addr (cu, op1, &addr) != 0) fprintf (out, " ???\n"); else { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, addr, addr, out); fprintf (out, "\n"); } } break; case DW_LLE_startx_endx: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op1, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op2, readp, nexthdr); fprintf (out, " %" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { Dwarf_Addr addr1; Dwarf_Addr addr2; if (get_indexed_addr (cu, op1, &addr1) != 0 || get_indexed_addr (cu, op2, &addr2) != 0) { fprintf (out, " ???..\n"); fprintf (out, " ???\n"); } else { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, addr1, addr1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, addr2 - 1, addr2, out); fprintf (out, "\n"); } } if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (len, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < len) goto invalid_entry; print_ops (dwflmod, dbg, 8, 8, version, address_size, offset_size, cu, len, readp, out); readp += len; break; case DW_LLE_startx_length: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op1, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op2, readp, nexthdr); fprintf (out, " %" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { Dwarf_Addr addr1; Dwarf_Addr addr2; if (get_indexed_addr (cu, op1, &addr1) != 0) { fprintf (out, " ???..\n"); fprintf (out, " ???\n"); } else { addr2 = addr1 + op2; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, addr1, addr1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, addr2 - 1, addr2, out); fprintf (out, "\n"); } } if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (len, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < len) goto invalid_entry; print_ops (dwflmod, dbg, 8, 8, version, address_size, offset_size, cu, len, readp, out); readp += len; break; case DW_LLE_offset_pair: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op1, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op2, readp, nexthdr); fprintf (out, " %" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { op1 += base; op2 += base; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, op1, op1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, op2 - 1, op2, out); fprintf (out, "\n"); } if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (len, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < len) goto invalid_entry; print_ops (dwflmod, dbg, 8, 8, version, address_size, offset_size, cu, len, readp, out); readp += len; break; case DW_LLE_default_location: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (len, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < len) goto invalid_entry; print_ops (dwflmod, dbg, 8, 8, version, address_size, offset_size, cu, len, readp, out); readp += len; break; case DW_LLE_base_address: if (address_size == 4) { if ((uint64_t) (nexthdr - readp) < 4) goto invalid_entry; op1 = read_4ubyte_unaligned_inc (dbg, readp); } else { if ((uint64_t) (nexthdr - readp) < 8) goto invalid_entry; op1 = read_8ubyte_unaligned_inc (dbg, readp); } base = op1; fprintf (out, " 0x%" PRIx64 "\n", base); if (! print_unresolved_addresses) { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, base, base, out); fprintf (out, "\n"); } break; case DW_LLE_start_end: if (address_size == 4) { if ((uint64_t) (nexthdr - readp) < 8) goto invalid_entry; op1 = read_4ubyte_unaligned_inc (dbg, readp); op2 = read_4ubyte_unaligned_inc (dbg, readp); } else { if ((uint64_t) (nexthdr - readp) < 16) goto invalid_entry; op1 = read_8ubyte_unaligned_inc (dbg, readp); op2 = read_8ubyte_unaligned_inc (dbg, readp); } fprintf (out, " 0x%" PRIx64 "..0x%" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, op1, op1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, op2 - 1, op2, out); fprintf (out, "\n"); } if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (len, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < len) goto invalid_entry; print_ops (dwflmod, dbg, 8, 8, version, address_size, offset_size, cu, len, readp, out); readp += len; break; case DW_LLE_start_length: if (address_size == 4) { if ((uint64_t) (nexthdr - readp) < 4) goto invalid_entry; op1 = read_4ubyte_unaligned_inc (dbg, readp); } else { if ((uint64_t) (nexthdr - readp) < 8) goto invalid_entry; op1 = read_8ubyte_unaligned_inc (dbg, readp); } if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op2, readp, nexthdr); fprintf (out, " 0x%" PRIx64 ", %" PRIx64 "\n", op1, op2); if (! print_unresolved_addresses) { op2 = op1 + op2; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, op1, op1, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, op2 - 1, op2, out); fprintf (out, "\n"); } if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (len, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < len) goto invalid_entry; print_ops (dwflmod, dbg, 8, 8, version, address_size, offset_size, cu, len, readp, out); readp += len; break; case DW_LLE_GNU_view_pair: if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op1, readp, nexthdr); if ((uint64_t) (nexthdr - readp) < 1) goto invalid_entry; get_uleb128 (op2, readp, nexthdr); fprintf (out, " %" PRIx64 ", %" PRIx64 "\n", op1, op2); break; default: goto invalid_entry; } } next_table: if (readp != nexthdr) { size_t padding = nexthdr - readp; fprintf (out, _(" %zu padding bytes\n\n"), padding); readp = nexthdr; } } } static void print_debug_loc_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_loc, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); sort_listptr (&known_locsptr, "loclistptr"); size_t listptr_idx = 0; uint_fast8_t address_size = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8; uint_fast8_t offset_size = 4; bool first = true; Dwarf_Addr base = 0; unsigned char *readp = data->d_buf; unsigned char *const endp = (unsigned char *) data->d_buf + data->d_size; Dwarf_CU *last_cu = NULL; while (readp < endp) { ptrdiff_t offset = readp - (unsigned char *) data->d_buf; Dwarf_CU *cu = last_cu; unsigned int attr = 0; if (first && skip_listptr_hole (&known_locsptr, &listptr_idx, &address_size, &offset_size, &base, &cu, offset, &readp, endp, &attr)) continue; if (last_cu != cu) { Dwarf_Die cudie; if (dwarf_cu_die (cu, &cudie, NULL, NULL, NULL, NULL, NULL, NULL) == NULL) fprintf (out, _("\n Unknown CU base: ")); else fprintf (out, _("\n CU [%6" PRIx64 "] base: "), dwarf_dieoffset (&cudie)); print_dwarf_addr (dwflmod, address_size, base, base, out); fprintf (out, "\n"); } last_cu = cu; if (attr == DW_AT_GNU_locviews) { Dwarf_Off next_off = next_listptr_offset (&known_locsptr, &listptr_idx, offset); const unsigned char *locp = readp; const unsigned char *locendp; if (next_off == 0 || next_off > (size_t) (endp - (const unsigned char *) data->d_buf)) locendp = endp; else locendp = (const unsigned char *) data->d_buf + next_off; while (locp < locendp) { uint64_t v1, v2; get_uleb128 (v1, locp, locendp); if (locp >= locendp) { fprintf (out, _(" [%6tx] <INVALID DATA>\n"), offset); break; } get_uleb128 (v2, locp, locendp); if (first) /* First view pair in a list. */ fprintf (out, " [%6tx] ", offset); else fprintf (out, " "); fprintf (out, "view pair %" PRId64 ", %" PRId64 "\n", v1, v2); first = false; } first = true; readp = (unsigned char *) locendp; continue; } /* GNU DebugFission encoded addresses as addrx. */ bool is_debugfission = ((cu != NULL || split_dwarf_cu_base (dbg, &cu, &base)) && (cu->version < 5 && cu->unit_type == DW_UT_split_compile)); if (!is_debugfission && unlikely (data->d_size - offset < (size_t) address_size * 2)) { invalid_data: fprintf (out, _(" [%6tx] <INVALID DATA>\n"), offset); break; } Dwarf_Addr begin; Dwarf_Addr end; bool use_base = true; if (is_debugfission) { const unsigned char *locp = readp; const unsigned char *locendp = readp + data->d_size; if (locp >= locendp) goto invalid_data; Dwarf_Word idx; unsigned char code = *locp++; switch (code) { case DW_LLE_GNU_end_of_list_entry: begin = 0; end = 0; break; case DW_LLE_GNU_base_address_selection_entry: if (locp >= locendp) goto invalid_data; begin = (Dwarf_Addr) -1; get_uleb128 (idx, locp, locendp); if (get_indexed_addr (cu, idx, &end) != 0) end = idx; /* ... */ break; case DW_LLE_GNU_start_end_entry: if (locp >= locendp) goto invalid_data; get_uleb128 (idx, locp, locendp); if (get_indexed_addr (cu, idx, &begin) != 0) begin = idx; /* ... */ if (locp >= locendp) goto invalid_data; get_uleb128 (idx, locp, locendp); if (get_indexed_addr (cu, idx, &end) != 0) end = idx; /* ... */ use_base = false; break; case DW_LLE_GNU_start_length_entry: if (locp >= locendp) goto invalid_data; get_uleb128 (idx, locp, locendp); if (get_indexed_addr (cu, idx, &begin) != 0) begin = idx; /* ... */ if (locendp - locp < 4) goto invalid_data; end = read_4ubyte_unaligned_inc (dbg, locp); end += begin; use_base = false; break; default: goto invalid_data; } readp = (unsigned char *) locp; } else if (address_size == 8) { begin = read_8ubyte_unaligned_inc (dbg, readp); end = read_8ubyte_unaligned_inc (dbg, readp); } else { begin = read_4ubyte_unaligned_inc (dbg, readp); end = read_4ubyte_unaligned_inc (dbg, readp); if (begin == (Dwarf_Addr) (uint32_t) -1) begin = (Dwarf_Addr) -1l; } if (begin == (Dwarf_Addr) -1l) /* Base address entry. */ { if (first) fprintf (out, " [%6tx] ", offset); else fprintf (out, " "); fputs (_("base address\n"), out); fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, end, end, out); fprintf (out, "\n"); base = end; first = false; } else if (begin == 0 && end == 0) /* End of list entry. */ { if (first) fprintf (out, _(" [%6tx] empty list\n"), offset); first = true; } else { /* We have a location expression entry. */ uint_fast16_t len = read_2ubyte_unaligned_inc (dbg, readp); if (first) /* First entry in a list. */ fprintf (out, " [%6tx] ", offset); else fprintf (out, " "); fprintf (out, "range %" PRIx64 ", %" PRIx64 "\n", begin, end); if (! print_unresolved_addresses) { Dwarf_Addr dab = use_base ? base + begin : begin; Dwarf_Addr dae = use_base ? base + end : end; fprintf (out, " "); print_dwarf_addr (dwflmod, address_size, dab, dab, out); fprintf (out, "..\n "); print_dwarf_addr (dwflmod, address_size, dae - 1, dae, out); fprintf (out, "\n"); } if (endp - readp <= (ptrdiff_t) len) { fputs (_(" <INVALID DATA>\n"), out); break; } print_ops (dwflmod, dbg, 11, 11, cu != NULL ? cu->version : 3, address_size, offset_size, cu, len, readp, out); first = false; readp += len; } } } struct mac_culist { Dwarf_Die die; Dwarf_Off offset; Dwarf_Files *files; struct mac_culist *next; }; static int mac_compare (const void *p1, const void *p2) { struct mac_culist *m1 = (struct mac_culist *) p1; struct mac_culist *m2 = (struct mac_culist *) p2; if (m1->offset < m2->offset) return -1; if (m1->offset > m2->offset) return 1; return 0; } static void print_debug_macinfo_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_macinfo, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); fputc ('\n', out); /* There is no function in libdw to iterate over the raw content of the section but it is easy enough to do. */ /* Get the source file information for all CUs. */ Dwarf_Off offset; Dwarf_Off ncu = 0; size_t hsize; struct mac_culist *culist = NULL; size_t nculist = 0; while (dwarf_nextcu (dbg, offset = ncu, &ncu, &hsize, NULL, NULL, NULL) == 0) { Dwarf_Die cudie; if (dwarf_offdie (dbg, offset + hsize, &cudie) == NULL) continue; Dwarf_Attribute attr; if (dwarf_attr (&cudie, DW_AT_macro_info, &attr) == NULL) continue; Dwarf_Word macoff; if (dwarf_formudata (&attr, &macoff) != 0) continue; struct mac_culist *newp = (struct mac_culist *) alloca (sizeof (*newp)); newp->die = cudie; newp->offset = macoff; newp->files = NULL; newp->next = culist; culist = newp; ++nculist; } /* Convert the list into an array for easier consumption. */ struct mac_culist *cus = (struct mac_culist *) alloca ((nculist + 1) * sizeof (*cus)); /* Add sentinel. */ cus[nculist].offset = data->d_size; cus[nculist].files = (Dwarf_Files *) -1l; if (nculist > 0) { for (size_t cnt = nculist - 1; culist != NULL; --cnt) { assert (cnt < nculist); cus[cnt] = *culist; culist = culist->next; } /* Sort the array according to the offset in the .debug_macinfo section. Note we keep the sentinel at the end. */ qsort (cus, nculist, sizeof (*cus), mac_compare); } const unsigned char *readp = (const unsigned char *) data->d_buf; const unsigned char *readendp = readp + data->d_size; int level = 1; while (readp < readendp) { unsigned int opcode = *readp++; unsigned int u128; unsigned int u128_2; const unsigned char *endp; switch (opcode) { case DW_MACINFO_define: case DW_MACINFO_undef: case DW_MACINFO_vendor_ext: /* For the first two opcodes the parameters are line, string For the latter number, string. We can treat these cases together. */ get_uleb128 (u128, readp, readendp); endp = memchr (readp, '\0', readendp - readp); if (unlikely (endp == NULL)) { fprintf (out, _("\ %*s*** non-terminated string at end of section"), level, ""); return; } if (opcode == DW_MACINFO_define) fprintf (out, "%*s#define %s, line %u\n", level, "", (char *) readp, u128); else if (opcode == DW_MACINFO_undef) fprintf (out, "%*s#undef %s, line %u\n", level, "", (char *) readp, u128); else fprintf (out, " #vendor-ext %s, number %u\n", (char *) readp, u128); readp = endp + 1; break; case DW_MACINFO_start_file: /* The two parameters are line and file index, in this order. */ get_uleb128 (u128, readp, readendp); if (readendp - readp < 1) { fprintf (out, _("\ %*s*** missing DW_MACINFO_start_file argument at end of section"), level, ""); return; } get_uleb128 (u128_2, readp, readendp); /* Find the CU DIE for this file. */ size_t macoff = readp - (const unsigned char *) data->d_buf; const char *fname = "???"; if (macoff >= cus[0].offset && cus[0].offset != data->d_size) { while (macoff >= cus[1].offset && cus[1].offset != data->d_size) ++cus; if (cus[0].files == NULL && dwarf_getsrcfiles (&cus[0].die, &cus[0].files, NULL) != 0) cus[0].files = (Dwarf_Files *) -1l; if (cus[0].files != (Dwarf_Files *) -1l) fname = (dwarf_filesrc (cus[0].files, u128_2, NULL, NULL) ?: "???"); } fprintf (out, "%*sstart_file %u, [%u] %s\n", level, "", u128, u128_2, fname); ++level; break; case DW_MACINFO_end_file: --level; fprintf (out, "%*send_file\n", level, ""); /* Nothing more to do. */ break; default: // XXX gcc seems to generate files with a trailing zero. if (unlikely (opcode != 0 || readp != readendp)) fprintf (out, "%*s*** invalid opcode %u\n", level, "", opcode); break; } } } static void print_debug_macro_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_macro, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); fputc ('\n', out); /* Get the source file information for all CUs. Uses same datastructure as macinfo. But uses offset field to directly match .debug_line offset. And just stored in a list. */ Dwarf_Off offset; Dwarf_Off ncu = 0; size_t hsize; struct mac_culist *culist = NULL; while (dwarf_nextcu (dbg, offset = ncu, &ncu, &hsize, NULL, NULL, NULL) == 0) { Dwarf_Die cudie; if (dwarf_offdie (dbg, offset + hsize, &cudie) == NULL) continue; Dwarf_Attribute attr; if (dwarf_attr (&cudie, DW_AT_stmt_list, &attr) == NULL) continue; Dwarf_Word lineoff; if (dwarf_formudata (&attr, &lineoff) != 0) continue; struct mac_culist *newp = (struct mac_culist *) alloca (sizeof (*newp)); newp->die = cudie; newp->offset = lineoff; newp->files = NULL; newp->next = culist; culist = newp; } const unsigned char *readp = (const unsigned char *) data->d_buf; const unsigned char *readendp = readp + data->d_size; while (readp < readendp) { fprintf (out, _(" Offset: 0x%" PRIx64 "\n"), (uint64_t) (readp - (const unsigned char *) data->d_buf)); // Header, 2 byte version, 1 byte flag, optional .debug_line offset, // optional vendor extension macro entry table. if (readp + 2 > readendp) { invalid_data: error (0, 0, _("invalid data")); return; } const uint16_t vers = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, _(" Version: %" PRIu16 "\n"), vers); // Version 4 is the GNU extension for DWARF4. DWARF5 will use version // 5 when it gets standardized. if (vers != 4 && vers != 5) { fprintf (out, _(" unknown version, cannot parse section\n")); return; } if (readp + 1 > readendp) goto invalid_data; const unsigned char flag = *readp++; fprintf (out, _(" Flag: 0x%" PRIx8), flag); if (flag != 0) { fprintf (out, " ("); if ((flag & 0x01) != 0) { fprintf (out, "offset_size"); if ((flag & 0xFE) != 0) fprintf (out, ", "); } if ((flag & 0x02) != 0) { fprintf (out, "debug_line_offset"); if ((flag & 0xFC) != 0) fprintf (out, ", "); } if ((flag & 0x04) != 0) { fprintf (out, "operands_table"); if ((flag & 0xF8) != 0) fprintf (out, ", "); } if ((flag & 0xF8) != 0) fprintf (out, "unknown"); fprintf (out, ")"); } fprintf (out, "\n"); unsigned int offset_len = (flag & 0x01) ? 8 : 4; fprintf (out, _(" Offset length: %" PRIu8 "\n"), offset_len); Dwarf_Off line_offset = -1; if (flag & 0x02) { if (offset_len == 8) line_offset = read_8ubyte_unaligned_inc (dbg, readp); else line_offset = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, _(" .debug_line offset: 0x%" PRIx64 "\n"), line_offset); } struct mac_culist *cu = NULL; if (line_offset != (Dwarf_Off) -1) { cu = culist; while (cu != NULL && line_offset != cu->offset) cu = cu->next; } Dwarf_Off str_offsets_base = str_offsets_base_off (dbg, (cu != NULL ? cu->die.cu : NULL)); const unsigned char *vendor[DW_MACRO_hi_user - DW_MACRO_lo_user + 1]; memset (vendor, 0, sizeof vendor); if (flag & 0x04) { // 1 byte length, for each item, 1 byte opcode, uleb128 number // of arguments, for each argument 1 byte form code. if (readp + 1 > readendp) goto invalid_data; unsigned int tlen = *readp++; fprintf (out, _(" extension opcode table, %" PRIu8 " items:\n"), tlen); for (unsigned int i = 0; i < tlen; i++) { if (readp + 1 > readendp) goto invalid_data; unsigned int opcode = *readp++; fprintf (out, _(" [%" PRIx8 "]"), opcode); if (opcode < DW_MACRO_lo_user || opcode > DW_MACRO_hi_user) goto invalid_data; // Record the start of description for this vendor opcode. // uleb128 nr args, 1 byte per arg form. vendor[opcode - DW_MACRO_lo_user] = readp; if (readp + 1 > readendp) goto invalid_data; unsigned int args = *readp++; if (args > 0) { fprintf (out, _(" %" PRIu8 " arguments:"), args); while (args > 0) { if (readp + 1 > readendp) goto invalid_data; unsigned int form = *readp++; fprintf (out, " %s", dwarf_form_name (form)); if (! libdw_valid_user_form (form)) goto invalid_data; args--; if (args > 0) fputc (',', out); } } else fprintf (out, _(" no arguments.")); fputc ('\n', out); } } fputc ('\n', out); int level = 1; if (readp + 1 > readendp) goto invalid_data; unsigned int opcode = *readp++; while (opcode != 0) { unsigned int u128; unsigned int u128_2; const unsigned char *endp; uint64_t off; switch (opcode) { case DW_MACRO_start_file: get_uleb128 (u128, readp, readendp); if (readp >= readendp) goto invalid_data; get_uleb128 (u128_2, readp, readendp); /* Find the CU DIE that matches this line offset. */ const char *fname = "???"; if (cu != NULL) { if (cu->files == NULL && dwarf_getsrcfiles (&cu->die, &cu->files, NULL) != 0) cu->files = (Dwarf_Files *) -1l; if (cu->files != (Dwarf_Files *) -1l) fname = (dwarf_filesrc (cu->files, u128_2, NULL, NULL) ?: "???"); } fprintf (out, "%*sstart_file %u, [%u] %s\n", level, "", u128, u128_2, fname); ++level; break; case DW_MACRO_end_file: --level; fprintf (out, "%*send_file\n", level, ""); break; case DW_MACRO_define: get_uleb128 (u128, readp, readendp); endp = memchr (readp, '\0', readendp - readp); if (endp == NULL) goto invalid_data; fprintf (out, "%*s#define %s, line %u\n", level, "", readp, u128); readp = endp + 1; break; case DW_MACRO_undef: get_uleb128 (u128, readp, readendp); endp = memchr (readp, '\0', readendp - readp); if (endp == NULL) goto invalid_data; fprintf (out, "%*s#undef %s, line %u\n", level, "", readp, u128); readp = endp + 1; break; case DW_MACRO_define_strp: get_uleb128 (u128, readp, readendp); if (readp + offset_len > readendp) goto invalid_data; if (offset_len == 8) off = read_8ubyte_unaligned_inc (dbg, readp); else off = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, "%*s#define %s, line %u (indirect)\n", level, "", dwarf_getstring (dbg, off, NULL), u128); break; case DW_MACRO_undef_strp: get_uleb128 (u128, readp, readendp); if (readp + offset_len > readendp) goto invalid_data; if (offset_len == 8) off = read_8ubyte_unaligned_inc (dbg, readp); else off = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, "%*s#undef %s, line %u (indirect)\n", level, "", dwarf_getstring (dbg, off, NULL), u128); break; case DW_MACRO_import: if (readp + offset_len > readendp) goto invalid_data; if (offset_len == 8) off = read_8ubyte_unaligned_inc (dbg, readp); else off = read_4ubyte_unaligned_inc (dbg, readp); fprintf (out, "%*s#include offset 0x%" PRIx64 "\n", level, "", off); break; case DW_MACRO_define_sup: get_uleb128 (u128, readp, readendp); fprintf (out, "%*s#define ", level, ""); readp = print_form_data (dbg, DW_FORM_strp_sup, readp, readendp, offset_len, str_offsets_base, out); fprintf (out, ", line %u (sup)\n", u128); break; case DW_MACRO_undef_sup: get_uleb128 (u128, readp, readendp); fprintf (out, "%*s#undef ", level, ""); readp = print_form_data (dbg, DW_FORM_strp_sup, readp, readendp, offset_len, str_offsets_base, out); fprintf (out, ", line %u (sup)\n", u128); break; case DW_MACRO_import_sup: if (readp + offset_len > readendp) goto invalid_data; if (offset_len == 8) off = read_8ubyte_unaligned_inc (dbg, readp); else off = read_4ubyte_unaligned_inc (dbg, readp); // XXX Needs support for reading from supplementary object file. fprintf (out, "%*s#include offset 0x%" PRIx64 " (sup)\n", level, "", off); break; case DW_MACRO_define_strx: get_uleb128 (u128, readp, readendp); fprintf (out, "%*s#define ", level, ""); readp = print_form_data (dbg, DW_FORM_strx, readp, readendp, offset_len, str_offsets_base, out); fprintf (out, ", line %u (strx)\n", u128); break; case DW_MACRO_undef_strx: get_uleb128 (u128, readp, readendp); fprintf (out, "%*s#undef ", level, ""); readp = print_form_data (dbg, DW_FORM_strx, readp, readendp, offset_len, str_offsets_base, out); fprintf (out, ", line %u (strx)\n", u128); break; default: fprintf (out, "%*svendor opcode 0x%" PRIx8, level, "", opcode); if (opcode < DW_MACRO_lo_user || opcode > DW_MACRO_lo_user || vendor[opcode - DW_MACRO_lo_user] == NULL) goto invalid_data; const unsigned char *op_desc; op_desc = vendor[opcode - DW_MACRO_lo_user]; // Just skip the arguments, we cannot really interpret them, // but print as much as we can. unsigned int args = *op_desc++; while (args > 0 && readp < readendp) { unsigned int form = *op_desc++; readp = print_form_data (dbg, form, readp, readendp, offset_len, str_offsets_base, out); args--; if (args > 0) fprintf (out, ", "); } fputc ('\n', out); } if (readp + 1 > readendp) goto invalid_data; opcode = *readp++; if (opcode == 0) fputc ('\n', out); } } } typedef struct { int n; FILE *out; } pubnames_arg; /* Callback for printing global names. */ static int print_pubnames (Dwarf *dbg __attribute__ ((unused)), Dwarf_Global *global, void *arg) { pubnames_arg *p = (pubnames_arg *) arg; fprintf (p->out, _(" [%5d] DIE offset: %6" PRId64 ", CU DIE offset: %6" PRId64 ", name: %s\n"), (p->n)++, global->die_offset, global->cu_offset, global->name); return 0; } /* Print the known exported symbols in the DWARF section '.debug_pubnames'. */ static void print_debug_pubnames_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { /* Check section actually exists. */ if (get_debug_elf_data (dbg, ebl, IDX_debug_pubnames, scn) == NULL) return; fprintf (out, _("\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); pubnames_arg arg = { 0, out }; (void) dwarf_getpubnames (dbg, print_pubnames, &arg, 0); } /* Print the content of the DWARF string section '.debug_str' or 'debug_line_str'. */ static void print_debug_str_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg __attribute__ ((unused)), FILE *out) { const char *name = section_name (ebl, shdr); int idx = ((name != NULL && strstr (name, "debug_line_str") != NULL) ? IDX_debug_line_str : IDX_debug_str); Elf_Data *data = get_debug_elf_data (dbg, ebl, idx, scn); if (data == NULL) return; const size_t sh_size = data->d_size; /* Compute floor(log16(shdr->sh_size)). */ GElf_Addr tmp = sh_size; int digits = 1; while (tmp >= 16) { ++digits; tmp >>= 4; } digits = MAX (4, digits); fprintf (out, _("\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n" " %*s String\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset, /* TRANS: the debugstr| prefix makes the string unique. */ digits + 2, sgettext ("debugstr|Offset")); Dwarf_Off offset = 0; while (offset < sh_size) { size_t len; const char *str = (const char *) data->d_buf + offset; const char *endp = memchr (str, '\0', sh_size - offset); if (unlikely (endp == NULL)) { fprintf (out, _(" *** error, missing string terminator\n")); break; } fprintf (out, " [%*" PRIx64 "] \"%s\"\n", digits, (uint64_t) offset, str); len = endp - str; offset += len + 1; } } static void print_debug_str_offsets_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { Elf_Data *data = get_debug_elf_data (dbg, ebl, IDX_debug_str_offsets, scn); if (data == NULL) return; fprintf (out, _("\ \nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset); if (shdr->sh_size == 0) return; size_t idx = 0; sort_listptr (&known_stroffbases, "str_offsets"); const unsigned char *start = (const unsigned char *) data->d_buf; const unsigned char *readp = start; const unsigned char *readendp = ((const unsigned char *) data->d_buf + data->d_size); while (readp < readendp) { /* Most string offset tables will have a header. For split dwarf unit GNU DebugFission didn't add one. But they were also only defined for split units (main or skeleton units didn't have indirect strings). So if we don't have a DW_AT_str_offsets_base at all and this is offset zero, then just start printing offsets immediately, if this is a .dwo section. */ Dwarf_Off off = (Dwarf_Off) (readp - (const unsigned char *) data->d_buf); fprintf (out, "Table at offset %" PRIx64 " ", off); /* Find the first CU that could plausibly be associated with this string offsets index. Skip CUs that point str_offsets_base before this table. */ struct listptr *listptr = get_listptr (&known_stroffbases, idx); while (listptr != NULL && listptr->offset < off) listptr = get_listptr (&known_stroffbases, ++idx); const unsigned char *next_unitp = readendp; uint8_t offset_size; bool has_header; if (listptr == NULL) { /* This can happen for .dwo files. There is only an header in the case this is a version 5 split DWARF file. */ Dwarf_CU *cu; uint8_t unit_type; if (dwarf_get_units (dbg, NULL, &cu, NULL, &unit_type, NULL, NULL) != 0) { error (0, 0, "Warning: Cannot find any DWARF unit."); /* Just guess some values. */ has_header = false; offset_size = 4; } else if (off == 0 && (unit_type == DW_UT_split_type || unit_type == DW_UT_split_compile)) { has_header = cu->version > 4; offset_size = cu->offset_size; } else { error (0, 0, "Warning: No CU references .debug_str_offsets after %" PRIx64, off); has_header = cu->version > 4; offset_size = cu->offset_size; } fprintf (out, "\n"); } else { /* This must be DWARF5, since GNU DebugFission didn't define DW_AT_str_offsets_base. */ has_header = true; Dwarf_Die cudie; if (dwarf_cu_die (listptr->cu, &cudie, NULL, NULL, NULL, NULL, NULL, NULL) == NULL) fprintf (out, "Unknown CU (%s):\n", dwarf_errmsg (-1)); else fprintf (out, "for CU [%6" PRIx64 "]:\n", dwarf_dieoffset (&cudie)); } if (has_header) { uint64_t unit_length; uint16_t version; uint16_t padding; unit_length = read_4ubyte_unaligned_inc (dbg, readp); if (unlikely (unit_length == 0xffffffff)) { if (unlikely (readp > readendp - 8)) { invalid_data: error (0, 0, "Invalid data"); return; } unit_length = read_8ubyte_unaligned_inc (dbg, readp); offset_size = 8; } else offset_size = 4; fprintf (out, "\n"); fprintf (out, _(" Length: %8" PRIu64 "\n"), unit_length); fprintf (out, _(" Offset size: %8" PRIu8 "\n"), offset_size); /* We need at least 2-bytes (version) + 2-bytes (padding) = 4 bytes to complete the header. And this unit cannot go beyond the section data. */ if (readp > readendp - 4 || unit_length < 4 || unit_length > (uint64_t) (readendp - readp)) goto invalid_data; next_unitp = readp + unit_length; version = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, _(" DWARF version: %8" PRIu16 "\n"), version); if (version != 5) { error (0, 0, _("Unknown version")); goto next_unit; } padding = read_2ubyte_unaligned_inc (dbg, readp); fprintf (out, _(" Padding: %8" PRIx16 "\n"), padding); if (listptr != NULL && listptr->offset != (Dwarf_Off) (readp - start)) { error (0, 0, "String offsets index doesn't start after header"); goto next_unit; } fprintf (out, "\n"); } int digits = 1; size_t offsets = (next_unitp - readp) / offset_size; while (offsets >= 10) { ++digits; offsets /= 10; } unsigned int uidx = 0; size_t index_offset = readp - (const unsigned char *) data->d_buf; fprintf (out, " Offsets start at 0x%zx:\n", index_offset); while (readp <= next_unitp - offset_size) { Dwarf_Word offset; if (offset_size == 4) offset = read_4ubyte_unaligned_inc (dbg, readp); else offset = read_8ubyte_unaligned_inc (dbg, readp); const char *str = dwarf_getstring (dbg, offset, NULL); fprintf (out, " [%*u] [%*" PRIx64 "] \"%s\"\n", digits, uidx++, (int) offset_size * 2, offset, str ?: "???"); } fprintf (out, "\n"); if (readp != next_unitp) error (0, 0, "extra %zd bytes at end of unit", (size_t) (next_unitp - readp)); next_unit: readp = next_unitp; } } /* Print the content of the call frame search table section '.eh_frame_hdr'. */ static void print_debug_frame_hdr_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl __attribute__ ((unused)), GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { fprintf (out, _("\ \nCall frame search table section [%2zu] '.eh_frame_hdr':\n"), elf_ndxscn (scn)); Elf_Data *data = elf_rawdata (scn, NULL); if (unlikely (data == NULL)) { error (0, 0, _("cannot get %s content: %s"), ".eh_frame_hdr", elf_errmsg (-1)); return; } const unsigned char *readp = data->d_buf; const unsigned char *const dataend = ((unsigned char *) data->d_buf + data->d_size); if (unlikely (readp + 4 > dataend)) { invalid_data: error (0, 0, _("invalid data")); return; } unsigned int version = *readp++; unsigned int eh_frame_ptr_enc = *readp++; unsigned int fde_count_enc = *readp++; unsigned int table_enc = *readp++; fprintf (out, " version: %u\n" " eh_frame_ptr_enc: %#x ", version, eh_frame_ptr_enc); print_encoding_base ("", eh_frame_ptr_enc, out); fprintf (out, " fde_count_enc: %#x ", fde_count_enc); print_encoding_base ("", fde_count_enc, out); fprintf (out, " table_enc: %#x ", table_enc); print_encoding_base ("", table_enc, out); uint64_t eh_frame_ptr = 0; if (eh_frame_ptr_enc != DW_EH_PE_omit) { readp = read_encoded (eh_frame_ptr_enc, readp, dataend, &eh_frame_ptr, dbg); if (unlikely (readp == NULL)) goto invalid_data; fprintf (out, " eh_frame_ptr: %#" PRIx64, eh_frame_ptr); if ((eh_frame_ptr_enc & 0x70) == DW_EH_PE_pcrel) fprintf (out, " (offset: %#" PRIx64 ")", /* +4 because of the 4 byte header of the section. */ (uint64_t) shdr->sh_offset + 4 + eh_frame_ptr); fputc ('\n', out); } uint64_t fde_count = 0; if (fde_count_enc != DW_EH_PE_omit) { readp = read_encoded (fde_count_enc, readp, dataend, &fde_count, dbg); if (unlikely (readp == NULL)) goto invalid_data; fprintf (out, " fde_count: %" PRIu64 "\n", fde_count); } if (fde_count == 0 || table_enc == DW_EH_PE_omit) return; fputs (" Table:\n", out); /* Optimize for the most common case. */ if (table_enc == (DW_EH_PE_datarel | DW_EH_PE_sdata4)) while (fde_count > 0 && readp + 8 <= dataend) { int32_t initial_location = read_4sbyte_unaligned_inc (dbg, readp); uint64_t initial_offset = ((uint64_t) shdr->sh_offset + (int64_t) initial_location); int32_t address = read_4sbyte_unaligned_inc (dbg, readp); // XXX Possibly print symbol name or section offset for initial_offset fprintf (out, " %#" PRIx32 " (offset: %#6" PRIx64 ") -> %#" PRIx32 " fde=[%6" PRIx64 "]\n", initial_location, initial_offset, address, address - (eh_frame_ptr + 4)); } else while (0 && readp < dataend) { } } /* Print the content of the exception handling table section '.eh_frame_hdr'. */ static void print_debug_exception_table (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl __attribute__ ((unused)), GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr __attribute__ ((unused)), Dwarf *dbg __attribute__ ((unused)), FILE *out) { fprintf (out, _("\ \nException handling table section [%2zu] '.gcc_except_table':\n"), elf_ndxscn (scn)); Elf_Data *data = elf_rawdata (scn, NULL); if (unlikely (data == NULL)) { error (0, 0, _("cannot get %s content: %s"), ".gcc_except_table", elf_errmsg (-1)); return; } const unsigned char *readp = data->d_buf; const unsigned char *const dataend = readp + data->d_size; if (unlikely (readp + 1 > dataend)) { invalid_data: error (0, 0, _("invalid data")); return; } unsigned int lpstart_encoding = *readp++; fprintf (out, _(" LPStart encoding: %#x "), lpstart_encoding); print_encoding_base ("", lpstart_encoding, out); if (lpstart_encoding != DW_EH_PE_omit) { uint64_t lpstart; readp = read_encoded (lpstart_encoding, readp, dataend, &lpstart, dbg); fprintf (out, " LPStart: %#" PRIx64 "\n", lpstart); } if (unlikely (readp + 1 > dataend)) goto invalid_data; unsigned int ttype_encoding = *readp++; fprintf (out, _(" TType encoding: %#x "), ttype_encoding); print_encoding_base ("", ttype_encoding, out); const unsigned char *ttype_base = NULL; if (ttype_encoding != DW_EH_PE_omit) { unsigned int ttype_base_offset; if (readp >= dataend) goto invalid_data; get_uleb128 (ttype_base_offset, readp, dataend); fprintf (out, " TType base offset: %#x\n", ttype_base_offset); if ((size_t) (dataend - readp) > ttype_base_offset) ttype_base = readp + ttype_base_offset; } if (unlikely (readp + 1 > dataend)) goto invalid_data; unsigned int call_site_encoding = *readp++; fprintf (out, _(" Call site encoding: %#x "), call_site_encoding); print_encoding_base ("", call_site_encoding, out); unsigned int call_site_table_len; if (readp >= dataend) goto invalid_data; get_uleb128 (call_site_table_len, readp, dataend); const unsigned char *const action_table = readp + call_site_table_len; if (unlikely (action_table > dataend)) goto invalid_data; unsigned int u = 0; unsigned int max_action = 0; while (readp < action_table) { if (u == 0) fputs (_("\n Call site table:\n"), out); uint64_t call_site_start; readp = read_encoded (call_site_encoding, readp, dataend, &call_site_start, dbg); uint64_t call_site_length; readp = read_encoded (call_site_encoding, readp, dataend, &call_site_length, dbg); uint64_t landing_pad; readp = read_encoded (call_site_encoding, readp, dataend, &landing_pad, dbg); unsigned int action; if (readp >= dataend) goto invalid_data; get_uleb128 (action, readp, dataend); max_action = MAX (action, max_action); fprintf (out, _(" [%4u] Call site start: %#" PRIx64 "\n" " Call site length: %" PRIu64 "\n" " Landing pad: %#" PRIx64 "\n" " Action: %u\n"), u++, call_site_start, call_site_length, landing_pad, action); } if (readp != action_table) goto invalid_data; unsigned int max_ar_filter = 0; if (max_action > 0) { fputs ("\n Action table:\n", out); size_t maxdata = (size_t) (dataend - action_table); if (max_action > maxdata || maxdata - max_action < 1) { invalid_action_table: fputs (_(" <INVALID DATA>\n"), stdout); return; } const unsigned char *const action_table_end = action_table + max_action + 1; u = 0; do { int ar_filter; get_sleb128 (ar_filter, readp, action_table_end); if (ar_filter > 0 && (unsigned int) ar_filter > max_ar_filter) max_ar_filter = ar_filter; int ar_disp; if (readp >= action_table_end) goto invalid_action_table; get_sleb128 (ar_disp, readp, action_table_end); fprintf (out, " [%4u] ar_filter: % d\n" " ar_disp: % -5d", u, ar_filter, ar_disp); if (abs (ar_disp) & 1) fprintf (out, " -> [%4u]\n", u + (ar_disp + 1) / 2); else if (ar_disp != 0) fputs (" -> ???\n", out); else fputc ('\n', out); ++u; } while (readp < action_table_end); } if (max_ar_filter > 0 && ttype_base != NULL) { unsigned char dsize; fputs ("\n TType table:\n", out); // XXX Not *4, size of encoding; switch (ttype_encoding & 7) { case DW_EH_PE_udata2: case DW_EH_PE_sdata2: dsize = 2; break; case DW_EH_PE_udata4: case DW_EH_PE_sdata4: dsize = 4; break; case DW_EH_PE_udata8: case DW_EH_PE_sdata8: dsize = 8; break; default: dsize = 0; error (1, 0, _("invalid TType encoding")); } if (max_ar_filter > (size_t) (ttype_base - (const unsigned char *) data->d_buf) / dsize) goto invalid_data; readp = ttype_base - max_ar_filter * dsize; do { uint64_t ttype; readp = read_encoded (ttype_encoding, readp, ttype_base, &ttype, dbg); fprintf (out, " [%4u] %#" PRIx64 "\n", max_ar_filter--, ttype); } while (readp < ttype_base); } } /* Print the content of the '.gdb_index' section. http://sourceware.org/gdb/current/onlinedocs/gdb/Index-Section-Format.html */ static void print_gdb_index_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { fprintf (out, _("\nGDB section [%2zu] '%s' at offset %#" PRIx64 " contains %" PRId64 " bytes :\n"), elf_ndxscn (scn), section_name (ebl, shdr), (uint64_t) shdr->sh_offset, (uint64_t) shdr->sh_size); Elf_Data *data = elf_rawdata (scn, NULL); if (unlikely (data == NULL)) { error (0, 0, _("cannot get %s content: %s"), ".gdb_index", elf_errmsg (-1)); return; } // .gdb_index is always in little endian. Dwarf dummy_dbg = { .other_byte_order = MY_ELFDATA != ELFDATA2LSB }; dbg = &dummy_dbg; const unsigned char *readp = data->d_buf; const unsigned char *const dataend = readp + data->d_size; if (unlikely (readp + 4 > dataend)) { invalid_data: error (0, 0, _("invalid data")); return; } int32_t vers = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" Version: %" PRId32 "\n"), vers); // The only difference between version 4 and version 5 is the // hash used for generating the table. Version 6 contains symbols // for inlined functions, older versions didn't. Version 7 adds // symbol kinds. Version 8 just indicates that it correctly includes // TUs for symbols. Version 9 adds shortcut table for information // regarding the main function. if (vers < 4 || vers > 9) { fprintf (out, _(" unknown version, cannot parse section\n")); return; } readp += 4; if (unlikely (readp + 4 > dataend)) goto invalid_data; uint32_t cu_off = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" CU offset: %#" PRIx32 "\n"), cu_off); readp += 4; if (unlikely (readp + 4 > dataend)) goto invalid_data; uint32_t tu_off = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" TU offset: %#" PRIx32 "\n"), tu_off); readp += 4; if (unlikely (readp + 4 > dataend)) goto invalid_data; uint32_t addr_off = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" address offset: %#" PRIx32 "\n"), addr_off); readp += 4; if (unlikely (readp + 4 > dataend)) goto invalid_data; uint32_t sym_off = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" symbol offset: %#" PRIx32 "\n"), sym_off); readp += 4; if (unlikely (readp + 4 > dataend)) goto invalid_data; uint32_t shortcut_off = 0; if (vers >= 9) { shortcut_off = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" shortcut offset: %#" PRIx32 "\n"), shortcut_off); readp += 4; if (unlikely (readp + 4 > dataend)) goto invalid_data; } uint32_t const_off = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" constant offset: %#" PRIx32 "\n"), const_off); if (unlikely ((size_t) (dataend - (const unsigned char *) data->d_buf) < const_off)) goto invalid_data; readp = data->d_buf + cu_off; const unsigned char *nextp = data->d_buf + tu_off; if (tu_off >= data->d_size) goto invalid_data; size_t cu_nr = (nextp - readp) / 16; fprintf (out, _("\n CU list at offset %#" PRIx32 " contains %zu entries:\n"), cu_off, cu_nr); size_t n = 0; while (dataend - readp >= 16 && n < cu_nr) { uint64_t off = read_8ubyte_unaligned (dbg, readp); readp += 8; uint64_t len = read_8ubyte_unaligned (dbg, readp); readp += 8; fprintf (out, " [%4zu] start: %0#8" PRIx64 ", length: %5" PRIu64 "\n", n, off, len); n++; } readp = data->d_buf + tu_off; nextp = data->d_buf + addr_off; if (addr_off >= data->d_size) goto invalid_data; size_t tu_nr = (nextp - readp) / 24; fprintf (out, _("\n TU list at offset %#" PRIx32 " contains %zu entries:\n"), tu_off, tu_nr); n = 0; while (dataend - readp >= 24 && n < tu_nr) { uint64_t off = read_8ubyte_unaligned (dbg, readp); readp += 8; uint64_t type = read_8ubyte_unaligned (dbg, readp); readp += 8; uint64_t sig = read_8ubyte_unaligned (dbg, readp); readp += 8; fprintf (out, " [%4zu] CU offset: %5" PRId64 ", type offset: %5" PRId64 ", signature: %0#8" PRIx64 "\n", n, off, type, sig); n++; } readp = data->d_buf + addr_off; nextp = data->d_buf + sym_off; if (sym_off >= data->d_size) goto invalid_data; size_t addr_nr = (nextp - readp) / 20; fprintf (out, _("\n Address list at offset %#" PRIx32 " contains %zu entries:\n"), addr_off, addr_nr); n = 0; while (dataend - readp >= 20 && n < addr_nr) { uint64_t low = read_8ubyte_unaligned (dbg, readp); readp += 8; uint64_t high = read_8ubyte_unaligned (dbg, readp); readp += 8; uint32_t idx = read_4ubyte_unaligned (dbg, readp); readp += 4; fprintf (out, " [%4zu] ", n); print_dwarf_addr (dwflmod, 8, low, low, out); fprintf (out, ".."); print_dwarf_addr (dwflmod, 8, high - 1, high, out); fprintf (out, ", CU index: %5" PRId32 "\n", idx); n++; } const unsigned char *const_start = data->d_buf + const_off; if (const_off > data->d_size) goto invalid_data; const unsigned char *shortcut_start = NULL; if (vers >= 9) { if (shortcut_off >= data->d_size) goto invalid_data; shortcut_start = data->d_buf + shortcut_off; nextp = shortcut_start; } else nextp = const_start; readp = data->d_buf + sym_off; size_t sym_nr = (nextp - readp) / 8; fprintf (out, _("\n Symbol table at offset %#" PRIx32 " contains %zu slots:\n"), sym_off, sym_nr); n = 0; while (dataend - readp >= 8 && n < sym_nr) { uint32_t name = read_4ubyte_unaligned (dbg, readp); readp += 4; uint32_t vector = read_4ubyte_unaligned (dbg, readp); readp += 4; if (name != 0 || vector != 0) { const unsigned char *sym = const_start + name; if (unlikely ((size_t) (dataend - const_start) < name || memchr (sym, '\0', dataend - sym) == NULL)) goto invalid_data; fprintf (out, " [%4zu] symbol: %s, CUs: ", n, sym); const unsigned char *readcus = const_start + vector; if (unlikely ((size_t) (dataend - const_start) < vector)) goto invalid_data; uint32_t cus = read_4ubyte_unaligned (dbg, readcus); while (cus--) { uint32_t cu_kind, cu, kind; bool is_static; readcus += 4; if (unlikely (readcus + 4 > dataend)) goto invalid_data; cu_kind = read_4ubyte_unaligned (dbg, readcus); cu = cu_kind & ((1 << 24) - 1); kind = (cu_kind >> 28) & 7; is_static = cu_kind & (1U << 31); if (cu > cu_nr - 1) fprintf (out, "%" PRId32 "T", cu - (uint32_t) cu_nr); else fprintf (out, "%" PRId32, cu); if (kind != 0) { fprintf (out, " ("); switch (kind) { case 1: fprintf (out, "type"); break; case 2: fprintf (out, "var"); break; case 3: fprintf (out, "func"); break; case 4: fprintf (out, "other"); break; default: fprintf (out, "unknown-0x%" PRIx32, kind); break; } fprintf (out, ":%c)", (is_static ? 'S' : 'G')); } if (cus > 0) fprintf (out, ", "); } fprintf (out, "\n"); } n++; } if (vers < 9) return; if (unlikely (shortcut_start == NULL)) goto invalid_data; readp = shortcut_start; nextp = const_start; size_t shortcut_nr = (nextp - readp) / 4; if (unlikely (shortcut_nr != 2)) goto invalid_data; fprintf (out, _("\nShortcut table at offset %#" PRIx32 " contains %zu slots:\n"), shortcut_off, shortcut_nr); uint32_t lang = read_4ubyte_unaligned (dbg, readp); readp += 4; /* Include the hex number of LANG in the output if the language is unknown. */ const char *lang_str = dwarf_lang_string (lang); lang_str = string_or_unknown (lang_str, lang, DW_LANG_lo_user, DW_LANG_hi_user, true); fprintf (out, _("Language of main: %s\n"), lang_str); fprintf (out, _("Name of main: ")); if (lang != 0) { uint32_t name = read_4ubyte_unaligned (dbg, readp); readp += 4; const unsigned char *sym = const_start + name; if (unlikely ((size_t) (dataend - const_start) < name || memchr (sym, '\0', dataend - sym) == NULL)) goto invalid_data; fprintf (out, "%s\n", sym); } else fprintf (out, "<unknown>\n"); } /* Print the content of the '.debug_cu_index' or '.debug_tu_index' sections. */ static void print_cu_index_section (Dwfl_Module *dwflmod __attribute__ ((unused)), Ebl *ebl, GElf_Ehdr *ehdr __attribute__ ((unused)), Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg, FILE *out) { const char *sname = section_name (ebl, shdr); fprintf (out, _("\nDWARF section [%2zu] '%s' at offset %#" PRIx64 " contains %" PRId64 " bytes :\n"), elf_ndxscn (scn), sname, (uint64_t) shdr->sh_offset, (uint64_t) shdr->sh_size); Elf_Data *data = elf_rawdata (scn, NULL); if (unlikely (data == NULL)) { error (0, 0, _("cannot get %s content: %s"), sname, elf_errmsg (-1)); return; } bool is_tu = sname != NULL && strcmp (sname, ".debug_tu_index") == 0; const unsigned char *readp = data->d_buf; const unsigned char *const dataend = readp + data->d_size; if (unlikely (readp > dataend - 4)) { invalid_data: error (0, 0, _("invalid data")); return; } /* If read as 4 bytes the version is 2, it is GNU DebugFission for DWARF 5, otherwise the version is in the first 2 bytes, with 2 bytes padding. */ int32_t vers = read_4ubyte_unaligned (dbg, readp); if (vers != 2) vers = read_2ubyte_unaligned (dbg, readp); fprintf (out, _(" Version: %8" PRId32 "\n"), vers); /* There used to be a version 1, which we don't support, but is described at https://gcc.gnu.org/wiki/DebugFissionDWP Version 2 is GNU DebugFission for DWARF4. Version 5 is the standardized DWARF5 index. Version 6 supports DWARF64 as described in https://dwarfstd.org/issues/220708.2.html */ if (vers != 2 && vers != 5 && vers != 6) { error (0, 0, _("unknown version, cannot parse section")); return; } /* The offset size field is only available in version 6. */ uint8_t offset_size_flag = 0; if (vers < 6) readp += 4; else { readp += 3; offset_size_flag = *readp; fprintf (out, _(" Offset Size: %4" PRIu8 "\n"), offset_size_flag == 0 ? 32 : 64); readp++; } /* Both offsets and sizes are either 32 or 64 bits (4 or 8 bytes). */ const unsigned char off_bytes = offset_size_flag == 0 ? 4 : 8; if (unlikely (readp > dataend - 4)) goto invalid_data; uint32_t section_count = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" Columns: %8" PRId32 "\n"), section_count); readp += 4; if (unlikely (readp > dataend - 4)) goto invalid_data; uint32_t unit_count = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" Entries: %8" PRId32 "\n"), unit_count); readp += 4; if (unlikely (readp > dataend - 4)) goto invalid_data; uint32_t slot_count = read_4ubyte_unaligned (dbg, readp); fprintf (out, _(" Slots: %8" PRId32 "\n"), slot_count); /* Really should be slot_count > 3 * unit_count / 2, but accept as long as slot_count is at least unit_count. */ if (slot_count < unit_count) { error (0, 0, _("Must have at least as many slots as entries")); return; } readp += 4; /* Hash table starts directly after header (16 bytes). */ const unsigned char *hash_table = readp; /* Indices (which slot is used for each hash id entry) start after the hash table (ids of 8 bytes). */ const unsigned char *indices = hash_table + slot_count * 8; /* Sections used starts after the indices, indices and hash table have the same number of slots, indices are 4 bytes each, */ const unsigned char *sections = indices + slot_count * 4; /* Offset slots for each section follow the one row of sections. */ const unsigned char *offsets = sections + section_count * 4; /* Size slots for each section follow the offsets (used rows). */ const unsigned char *lengths = (offsets + unit_count * section_count * off_bytes); /* The size table has one row of section_count slots per unit, just like the offset table, so it spans unit_count rows (not one). */ const unsigned char *lengths_end = (lengths + unit_count * section_count * off_bytes); /* Sanity check the above against dataend. */ if ((slot_count > UINT32_MAX / 8) || (section_count > SIZE_MAX / off_bytes) || (unit_count > SIZE_MAX / off_bytes) || ((unit_count != 0) && (section_count > SIZE_MAX / unit_count)) || ((section_count != 0) && (unit_count > SIZE_MAX / section_count)) || ((unit_count != 0) && (section_count > SIZE_MAX / (4 * (size_t) unit_count))) || (indices > dataend) || (sections > dataend) || (offsets > dataend) || (lengths > dataend) || (lengths_end > dataend)) goto invalid_data; fprintf (out, _("\n Offset table\n")); fprintf (out, " slot %s", is_tu ? "tu sig" : "dwo id"); fprintf (out, " "); for (size_t i = 0; i < section_count; i++) { uint32_t section = read_4ubyte_unaligned (dbg, sections + i * 4); const char *sec_str = dwarf_section_short_string (vers, section); if (sec_str == NULL) fprintf (out, " ??? %2x", section); else fprintf (out, " %6s", sec_str); } fprintf (out, "\n"); for (size_t i = 0; i < slot_count; i++) { uint64_t id; uint32_t row; id = read_8ubyte_unaligned (dbg, hash_table + i * 8); row = read_4ubyte_unaligned (dbg, indices + i * 4); /* Only print used rows. */ if (id != 0 && row != 0) { fprintf (out, " [%3zd] %016" PRIx64 " ", i, id); if (row > unit_count) { error (0, 0, _("Row (%" PRIu32 ") larger than " "unit count (%" PRIu32 ")"), row, unit_count); continue; } /* Note row is one based, not zero based. */ const unsigned char *prow = (offsets + ((row - 1) * section_count * off_bytes)); if (off_bytes == 4) for (size_t j = 0; j < section_count; j++) { uint32_t off = read_4ubyte_unaligned (dbg, prow + j * 4); fprintf (out, " %6" PRIu32, off); } else for (size_t j = 0; j < section_count; j++) { uint64_t off = read_8ubyte_unaligned (dbg, prow + j * 8); fprintf (out, " %6" PRIu64, off); } fprintf (out, "\n"); } } fprintf (out, _("\n Size table\n")); fprintf (out, " slot %s", is_tu ? "tu sig" : "dwo id"); fprintf (out, " "); for (size_t i = 0; i < section_count; i++) { uint32_t section = read_4ubyte_unaligned (dbg, sections + i * 4); const char *sec_str = dwarf_section_short_string (vers, section); if (sec_str == NULL) fprintf (out, " ??? %2x", section); else fprintf (out, " %6s", sec_str); } fprintf (out, "\n"); for (size_t i = 0; i < slot_count; i++) { uint64_t id; uint32_t row; id = read_8ubyte_unaligned (dbg, hash_table + i * 8); row = read_4ubyte_unaligned (dbg, indices + i * 4); /* Only print used rows. */ if (id != 0 && row != 0) { fprintf (out, " [%3zd] %016" PRIx64 " ", i, id); if (row > unit_count) { error (0, 0, _("Row (%" PRIu32 ") larger than " "unit count (%" PRIu32 ")"), row, unit_count); continue; } /* Note row is one based, not zero based. */ const unsigned char *prow = (lengths + (row - 1) * section_count * off_bytes); if (off_bytes == 4) for (size_t j = 0; j < section_count; j++) { uint32_t sz = read_4ubyte_unaligned (dbg, prow + j * 4); fprintf (out, " %6" PRIu32, sz); } else for (size_t j = 0; j < section_count; j++) { uint64_t sz = read_8ubyte_unaligned (dbg, prow + j * 8); fprintf (out, " %6" PRIu64, sz); } fprintf (out, "\n"); } } } /* Returns true and sets split DWARF CU id if there is a split compile unit in the given Dwarf, and no non-split units are found (before it). */ static bool is_split_dwarf (Dwarf *dbg, uint64_t *id, Dwarf_CU **split_cu) { Dwarf_CU *cu = NULL; while (dwarf_get_units (dbg, cu, &cu, NULL, NULL, NULL, NULL) == 0) { uint8_t unit_type; if (dwarf_cu_info (cu, NULL, &unit_type, NULL, NULL, id, NULL, NULL) != 0) return false; if (unit_type != DW_UT_split_compile && unit_type != DW_UT_split_type) return false; /* We really only care about the split compile unit, the types should be fine and self sufficient. Also they don't have an id that we can match with a skeleton unit. */ if (unit_type == DW_UT_split_compile) { *split_cu = cu; return true; } } return false; } /* Check that there is one and only one Dwfl_Module, return in arg. */ static int getone_dwflmod (Dwfl_Module *dwflmod, void **userdata __attribute__ ((unused)), const char *name __attribute__ ((unused)), Dwarf_Addr base __attribute__ ((unused)), void *arg) { Dwfl_Module **m = (Dwfl_Module **) arg; if (*m != NULL) return DWARF_CB_ABORT; *m = dwflmod; return DWARF_CB_OK; } typedef struct Job_Data { struct Job_Data *next; Dwfl_Module *dwflmod; Ebl *ebl; GElf_Ehdr *ehdr; Elf_Scn scn; GElf_Shdr shdr; Dwarf *dbg; FILE *out; void (*fp) (Dwfl_Module *, Ebl *, GElf_Ehdr *, Elf_Scn *, GElf_Shdr *, Dwarf *, FILE *); } job_data; #ifdef USE_LOCKS /* Thread entry point. */ static void * do_job (void *data, FILE *out) { job_data *d = (job_data *) data; d->fp (d->dwflmod, d->ebl, d->ehdr, &d->scn, &d->shdr, d->dbg, out); return NULL; } #endif /* If readelf is built with thread safety, then set up JDATA at index IDX and add it to the job queue. If thread safety is not supported or the maximum number of threads is set to 1, then immediately call START_ROUTINE with the given arguments. */ static void schedule_job (job_data **jdatalist, void (*start_routine) (Dwfl_Module *, Ebl *, GElf_Ehdr *, Elf_Scn *, GElf_Shdr *, Dwarf *, FILE *), Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg) { #ifdef USE_LOCKS if (max_threads > 1) { job_data *jdata = xmalloc (sizeof (job_data)); jdata->dwflmod = dwflmod; jdata->ebl = ebl; jdata->ehdr = ehdr; jdata->scn = *scn; jdata->shdr = *shdr; jdata->dbg = dbg; jdata->fp = start_routine; jdata->next = *jdatalist; *jdatalist = jdata; add_job (do_job, (void *) jdata); } else start_routine (dwflmod, ebl, ehdr, scn, shdr, dbg, stdout); #else (void) jdatalist; start_routine (dwflmod, ebl, ehdr, scn, shdr, dbg, stdout); #endif } static void print_debug (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr) { /* Used for skeleton file, if necessary for split DWARF. */ Dwfl *skel_dwfl = NULL; Dwfl_Module *skel_mod = NULL; char *skel_name = NULL; Dwarf *split_dbg = NULL; Dwarf_CU *split_cu = NULL; /* If we need to implicitly or explicitly scan the debug_info section we might need a bit more info, like a skeleton for split dwarf file). */ bool implicit_info = (implicit_debug_sections & section_info) != 0; bool explicit_info = (print_debug_sections & section_info) != 0; /* Before we start the real work get a debug context descriptor. */ Dwarf_Addr dwbias; Dwarf *dbg = dwfl_module_getdwarf (dwflmod, &dwbias); Dwarf dummy_dbg = { .elf = ebl->elf, .other_byte_order = MY_ELFDATA != ehdr->e_ident[EI_DATA] }; if (dbg == NULL) { if ((print_debug_sections & ~(section_exception|section_frame)) != 0) error (0, 0, _("cannot get debug context descriptor: %s"), dwfl_errmsg (-1)); dbg = &dummy_dbg; } else if (implicit_info || explicit_info) { /* If we are asked about a split dwarf (.dwo) file, use the user provided, or find the corresponding skeleton file. If we got a skeleton file, replace the given dwflmod and dbg, with one derived from the skeleton file to provide enough context. */ uint64_t split_id; if (is_split_dwarf (dbg, &split_id, &split_cu)) { if (dwarf_skeleton != NULL) skel_name = strdup (dwarf_skeleton); else { /* Replace file.dwo with file.o and see if that matches. */ const char *fname; dwfl_module_info (dwflmod, NULL, NULL, NULL, NULL, NULL, &fname, NULL); if (fname != NULL) { size_t flen = strlen (fname); if (flen > 4 && strcmp (".dwo", fname + flen - 4) == 0) { skel_name = strdup (fname); if (skel_name != NULL) { skel_name[flen - 3] = 'o'; skel_name[flen - 2] = '\0'; } } } } if (skel_name != NULL) { int skel_fd = open (skel_name, O_RDONLY); if (skel_fd == -1) fprintf (stderr, "Warning: Couldn't open DWARF skeleton file" " '%s'\n", skel_name); else { skel_dwfl = create_dwfl (skel_fd, skel_name); /* skel_fd was dup'ed by create_dwfl. We can close the original now. */ close (skel_fd); } if (skel_dwfl != NULL) { if (dwfl_getmodules (skel_dwfl, &getone_dwflmod, &skel_mod, 0) != 0) { fprintf (stderr, "Warning: Bad DWARF skeleton," " multiple modules '%s'\n", skel_name); dwfl_end (skel_dwfl); skel_mod = NULL; } } else if (skel_fd != -1) fprintf (stderr, "Warning: Couldn't create skeleton dwfl for" " '%s': %s\n", skel_name, dwfl_errmsg (-1)); if (skel_mod != NULL) { Dwarf *skel_dbg = dwfl_module_getdwarf (skel_mod, &dwbias); if (skel_dbg != NULL) { /* First check the skeleton CU DIE, only fetch the split DIE if we know the id matches to not unnecessary search for any split DIEs we don't need. */ Dwarf_CU *cu = NULL; while (dwarf_get_units (skel_dbg, cu, &cu, NULL, NULL, NULL, NULL) == 0) { uint8_t unit_type; uint64_t skel_id; if (dwarf_cu_info (cu, NULL, &unit_type, NULL, NULL, &skel_id, NULL, NULL) == 0 && unit_type == DW_UT_skeleton && split_id == skel_id) { Dwarf_Die subdie; if (dwarf_cu_info (cu, NULL, NULL, NULL, &subdie, NULL, NULL, NULL) == 0 && dwarf_tag (&subdie) != DW_TAG_invalid) { split_dbg = dwarf_cu_getdwarf (subdie.cu); if (split_dbg == NULL) fprintf (stderr, "Warning: Couldn't get split_dbg:" " %s\n", dwarf_errmsg (-1)); break; } else { /* Everything matches up, but not according to libdw. Which means the user knew better. So... Terrible hack... We can never destroy the underlying dwfl because it would free the wrong Dwarfs... So we leak memory...*/ if (cu->split == NULL && dwarf_skeleton != NULL) { do_not_close_dwfl = true; __libdw_link_skel_split (cu, split_cu); split_dbg = dwarf_cu_getdwarf (split_cu); break; } else fprintf (stderr, "Warning: Couldn't get" " skeleton subdie: %s\n", dwarf_errmsg (-1)); } } } if (split_dbg == NULL) fprintf (stderr, "Warning: '%s' didn't contain a skeleton for split id %" PRIx64 "\n", skel_name, split_id); } else fprintf (stderr, "Warning: Couldn't get skeleton DWARF:" " %s\n", dwfl_errmsg (-1)); } } if (split_dbg != NULL) { dbg = split_dbg; dwflmod = skel_mod; } else if (skel_name == NULL) fprintf (stderr, "Warning: split DWARF file, but no skeleton found.\n"); } else if (dwarf_skeleton != NULL) fprintf (stderr, "Warning: DWARF skeleton given," " but not a split DWARF file\n"); } /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); job_data *jdatalist = NULL; /* If the .debug_info section is listed as implicitly required then we must make sure to handle it before handling any other debug section. Various other sections depend on the CU DIEs being scanned (silently) first. */ if (implicit_info) { Elf_Scn *scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr != NULL && shdr->sh_type == SHT_PROGBITS) { const char *name = elf_strptr (ebl->elf, shstrndx, shdr->sh_name); if (name == NULL) continue; if (strcmp (name, ".debug_info") == 0 || strcmp (name, ".debug_info.dwo") == 0 || strcmp (name, ".zdebug_info") == 0 || strcmp (name, ".zdebug_info.dwo") == 0 || strcmp (name, ".gnu.debuglto_.debug_info") == 0) { print_debug_info_section (dwflmod, ebl, ehdr, scn, shdr, dbg, stdout); break; } } } print_debug_sections &= ~section_info; implicit_debug_sections &= ~section_info; } /* Look through all the sections for the debugging sections to print. */ Elf_Scn *scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr != NULL && shdr->sh_type == SHT_PROGBITS) { static const struct { const char *name; enum section_e bitmask; void (*fp) (Dwfl_Module *, Ebl *, GElf_Ehdr *, Elf_Scn *, GElf_Shdr *, Dwarf *, FILE *); } debug_sections[] = { #define NEW_SECTION(name) \ { ".debug_" #name, section_##name, print_debug_##name##_section } NEW_SECTION (abbrev), NEW_SECTION (addr), NEW_SECTION (aranges), NEW_SECTION (frame), NEW_SECTION (info), NEW_SECTION (types), NEW_SECTION (line), NEW_SECTION (loc), /* loclists is loc for DWARF5. */ { ".debug_loclists", section_loc, print_debug_loclists_section }, NEW_SECTION (pubnames), NEW_SECTION (str), /* A DWARF5 specialised debug string section. */ { ".debug_line_str", section_str, print_debug_str_section }, /* DWARF5 string offsets table. */ { ".debug_str_offsets", section_str, print_debug_str_offsets_section }, NEW_SECTION (macinfo), NEW_SECTION (macro), NEW_SECTION (ranges), /* rnglists is ranges for DWARF5. */ { ".debug_rnglists", section_ranges, print_debug_rnglists_section }, { ".eh_frame", section_frame | section_exception, print_debug_frame_section }, { ".eh_frame_hdr", section_frame | section_exception, print_debug_frame_hdr_section }, { ".gcc_except_table", section_frame | section_exception, print_debug_exception_table }, { ".gdb_index", section_gdb_index, print_gdb_index_section }, { ".debug_cu_index", section_cu_index, print_cu_index_section }, { ".debug_tu_index", section_cu_index, print_cu_index_section }, }; const int ndebug_sections = (sizeof (debug_sections) / sizeof (debug_sections[0])); const char *name = elf_strptr (ebl->elf, shstrndx, shdr->sh_name); if (name == NULL) continue; int n; for (n = 0; n < ndebug_sections; ++n) { size_t dbglen = strlen (debug_sections[n].name); size_t scnlen = strlen (name); if ((strncmp (name, debug_sections[n].name, dbglen) == 0 && (dbglen == scnlen || (scnlen == dbglen + 4 && strstr (name, ".dwo") == name + dbglen))) || (name[0] == '.' && name[1] == 'z' && debug_sections[n].name[1] == 'd' && strncmp (&name[2], &debug_sections[n].name[1], dbglen - 1) == 0 && (scnlen == dbglen + 1 || (scnlen == dbglen + 5 && strstr (name, ".dwo") == name + dbglen + 1))) || (scnlen > 14 /* .gnu.debuglto_ prefix. */ && startswith (name, ".gnu.debuglto_") && strcmp (&name[14], debug_sections[n].name) == 0) ) { if (((print_debug_sections | implicit_debug_sections) & debug_sections[n].bitmask)) schedule_job (&jdatalist, debug_sections[n].fp, dwflmod, ebl, ehdr, scn, shdr, dbg); break; } } } } #ifdef USE_LOCKS /* If max_threads <= 1, then jobs were immediately run in schedule_job. */ if (max_threads > 1) run_jobs (max_threads); #endif dwfl_end (skel_dwfl); free (skel_name); while (jdatalist != NULL) { job_data *jdata = jdatalist; jdatalist = jdatalist->next; free (jdata); } /* Turn implicit and/or explicit back on in case we go over another file. */ if (implicit_info) implicit_debug_sections |= section_info; if (explicit_info) print_debug_sections |= section_info; reset_listptr (&known_locsptr); reset_listptr (&known_loclistsptr); reset_listptr (&known_rangelistptr); reset_listptr (&known_rnglistptr); reset_listptr (&known_addrbases); reset_listptr (&known_stroffbases); } #define ITEM_INDENT 4 #define WRAP_COLUMN 75 /* Print "NAME: FORMAT", wrapping when output text would make the line exceed WRAP_COLUMN. Unpadded numbers look better for the core items but this function is also used for registers which should be printed aligned. Fortunately registers output uses fixed fields width (such as %11d) for the alignment. Line breaks should not depend on the particular values although that may happen in some cases of the core items. */ static unsigned int __attribute__ ((format (printf, 6, 7))) print_core_item (unsigned int colno, char sep, unsigned int wrap, size_t name_width, const char *name, const char *format, ...) { size_t len = strlen (name); if (name_width < len) name_width = len; char *out; va_list ap; va_start (ap, format); int out_len = vasprintf (&out, format, ap); va_end (ap); if (out_len == -1) error_exit (0, _("memory exhausted")); size_t n = name_width + sizeof ": " - 1 + out_len; if (colno == 0) { printf ("%*s", ITEM_INDENT, ""); colno = ITEM_INDENT + n; } else if (colno + 2 + n < wrap) { printf ("%c ", sep); colno += 2 + n; } else { printf ("\n%*s", ITEM_INDENT, ""); colno = ITEM_INDENT + n; } printf ("%s: %*s%s", name, (int) (name_width - len), "", out); free (out); return colno; } static const void * convert (Elf *core, Elf_Type type, uint_fast16_t count, void *value, const void *data, size_t size) { Elf_Data valuedata = { .d_type = type, .d_buf = value, .d_size = size ?: gelf_fsize (core, type, count, EV_CURRENT), .d_version = EV_CURRENT, }; Elf_Data indata = { .d_type = type, .d_buf = (void *) data, .d_size = valuedata.d_size, .d_version = EV_CURRENT, }; Elf_Data *d = (gelf_getclass (core) == ELFCLASS32 ? elf32_xlatetom : elf64_xlatetom) (&valuedata, &indata, elf_getident (core, NULL)[EI_DATA]); if (d == NULL) error_exit (0, _("cannot convert core note data: %s"), elf_errmsg (-1)); return data + indata.d_size; } typedef uint8_t GElf_Byte; static unsigned int handle_core_item (Elf *core, const GElf_Ehdr *ehdr, const Ebl_Core_Item *item, const void *desc, unsigned int colno, size_t *repeated_size) { uint_fast16_t count = item->count ?: 1; /* Ebl_Core_Item count is always a small number. Make sure the backend didn't put in some large bogus value. */ assert (count < 128); #define TYPES \ DO_TYPE (BYTE, Byte, "0x%.2" PRIx8, "%" PRId8); \ DO_TYPE (HALF, Half, "0x%.4" PRIx16, "%" PRId16); \ DO_TYPE (WORD, Word, "0x%.8" PRIx32, "%" PRId32); \ DO_TYPE (SWORD, Sword, "%" PRId32, "%" PRId32); \ DO_TYPE (XWORD, Xword, "0x%.16" PRIx64, "%" PRId64); \ DO_TYPE (SXWORD, Sxword, "%" PRId64, "%" PRId64) #define DO_TYPE(NAME, Name, hex, dec) GElf_##Name Name typedef union { TYPES; } value_t; void *data = alloca (count * sizeof (value_t)); #undef DO_TYPE #define DO_TYPE(NAME, Name, hex, dec) \ GElf_##Name *value_##Name __attribute__((unused)) = data TYPES; #undef DO_TYPE size_t size = gelf_fsize (core, item->type, count, EV_CURRENT); size_t convsize = size; if (repeated_size != NULL) { if (*repeated_size > size && (item->format == 'b' || item->format == 'B')) { /* The descriptor size of a core note comes from an untrusted ELF file. Cap the stack allocation so a malformed note that claims a very large n_descsz cannot exhaust the process stack and crash readelf. count and convsize are derived from the capped size so convert () cannot write past data. */ size_t alloc_size = MIN (*repeated_size, 64 * 1024); data = alloca (alloc_size); count *= alloc_size / size; convsize = count * size; *repeated_size -= convsize; } else if (item->count != 0 || item->format != '\n') *repeated_size -= size; } convert (core, item->type, count, data, desc + item->offset, convsize); Elf_Type type = item->type; if (type == ELF_T_ADDR) type = gelf_getclass (core) == ELFCLASS32 ? ELF_T_WORD : ELF_T_XWORD; switch (item->format) { case 'd': assert (count == 1); switch (type) { #define DO_TYPE(NAME, Name, hex, dec) \ case ELF_T_##NAME: \ colno = print_core_item (colno, ',', WRAP_COLUMN, \ 0, item->name, dec, value_##Name[0]); \ break TYPES; #undef DO_TYPE default: abort (); } break; case 'x': assert (count == 1); switch (type) { #define DO_TYPE(NAME, Name, hex, dec) \ case ELF_T_##NAME: \ colno = print_core_item (colno, ',', WRAP_COLUMN, \ 0, item->name, hex, value_##Name[0]); \ break TYPES; #undef DO_TYPE default: abort (); } break; case 'b': case 'B': assert (size % sizeof (unsigned int) == 0); unsigned int nbits = count * size * 8; unsigned int pop = 0; for (const unsigned int *i = data; (void *) i < data + count * size; ++i) pop += __builtin_popcount (*i); bool negate = pop > nbits / 2; const unsigned int bias = item->format == 'b'; { char printed[(negate ? nbits - pop : pop) * 16 + 1]; char *p = printed; *p = '\0'; if (BYTE_ORDER != LITTLE_ENDIAN && size > sizeof (unsigned int)) { assert (size == sizeof (unsigned int) * 2); for (unsigned int *i = data; (void *) i < data + count * size; i += 2) { unsigned int w = i[1]; i[1] = i[0]; i[0] = w; } } unsigned int lastbit = 0; unsigned int run = 0; for (const unsigned int *i = data; (void *) i < data + count * size; ++i) { unsigned int bit = ((void *) i - data) * 8; unsigned int w = negate ? ~*i : *i; while (w != 0) { /* Note that a right shift equal to (or greater than) the number of bits of w is undefined behaviour. In particular when the least significant bit is bit 32 (w = 0x8000000) then w >>= n is undefined. So explicitly handle that case separately. */ unsigned int n = ffs (w); if (n < sizeof (w) * 8) w >>= n; else w = 0; bit += n; if (lastbit != 0 && lastbit + 1 == bit) ++run; else { if (lastbit == 0) p += sprintf (p, "%u", bit - bias); else if (run == 0) p += sprintf (p, ",%u", bit - bias); else p += sprintf (p, "-%u,%u", lastbit - bias, bit - bias); run = 0; } lastbit = bit; } } if (lastbit > 0 && run > 0 && lastbit + 1 != nbits) p += sprintf (p, "-%u", lastbit - bias); colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name, negate ? "~<%s>" : "<%s>", printed); } break; case 'T': case (char) ('T'|0x80): assert (count == 2); Dwarf_Word sec; Dwarf_Word usec; switch (type) { #define DO_TYPE(NAME, Name, hex, dec) \ case ELF_T_##NAME: \ sec = value_##Name[0]; \ usec = value_##Name[1]; \ break TYPES; #undef DO_TYPE default: abort (); } if (unlikely (item->format == (char) ('T'|0x80))) { /* This is a hack for an ill-considered 64-bit ABI where tv_usec is actually a 32-bit field with 32 bits of padding rounding out struct timeval. We've already converted it as a 64-bit field. For little-endian, this just means the high half is the padding; it's presumably zero, but should be ignored anyway. For big-endian, it means the 32-bit field went into the high half of USEC. */ if (likely (ehdr->e_ident[EI_DATA] == ELFDATA2MSB)) usec >>= 32; else usec &= UINT32_MAX; } colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name, "%" PRIu64 ".%.6" PRIu64, sec, usec); break; case 'c': assert (count == 1); colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name, "%c", value_Byte[0]); break; case 's': colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name, "%.*s", (int) count, value_Byte); break; case '\n': /* This is a list of strings separated by '\n'. */ assert (item->count == 0); assert (repeated_size != NULL); assert (item->name == NULL); if (unlikely (item->offset >= *repeated_size)) break; const char *s = desc + item->offset; size = *repeated_size - item->offset; *repeated_size = 0; while (size > 0) { const char *eol = memchr (s, '\n', size); int len = size; if (eol != NULL) len = eol - s; printf ("%*s%.*s\n", ITEM_INDENT, "", len, s); if (eol == NULL) break; size -= eol + 1 - s; s = eol + 1; } colno = WRAP_COLUMN; break; case 'h': break; default: error (0, 0, "XXX not handling format '%c' for %s", item->format, item->name); break; } #undef TYPES return colno; } /* Sort items by group, and by layout offset within each group. */ static int compare_core_items (const void *a, const void *b) { const Ebl_Core_Item *const *p1 = a; const Ebl_Core_Item *const *p2 = b; const Ebl_Core_Item *item1 = *p1; const Ebl_Core_Item *item2 = *p2; return ((item1->group == item2->group ? 0 : strcmp (item1->group, item2->group)) ?: (int) item1->offset - (int) item2->offset); } /* Sort item groups by layout offset of the first item in the group. */ static int compare_core_item_groups (const void *a, const void *b) { const Ebl_Core_Item *const *const *p1 = a; const Ebl_Core_Item *const *const *p2 = b; const Ebl_Core_Item *const *group1 = *p1; const Ebl_Core_Item *const *group2 = *p2; const Ebl_Core_Item *item1 = *group1; const Ebl_Core_Item *item2 = *group2; return (int) item1->offset - (int) item2->offset; } static unsigned int handle_core_items (Elf *core, const GElf_Ehdr *ehdr, const void *desc, size_t descsz, const Ebl_Core_Item *items, size_t nitems) { if (nitems == 0) return 0; unsigned int colno = 0; /* FORMAT '\n' makes sense to be present only as a single item as it processes all the data of a note. FORMATs 'b' and 'B' have a special case if present as a single item but they can be also processed with other items below. */ if (nitems == 1 && (items[0].format == '\n' || items[0].format == 'b' || items[0].format == 'B')) { assert (items[0].offset == 0); size_t size = descsz; colno = handle_core_item (core, ehdr, items, desc, colno, &size); /* If SIZE is not zero here there is some remaining data. But we do not know how to process it anyway. */ return colno; } for (size_t i = 0; i < nitems; ++i) assert (items[i].format != '\n'); /* Sort to collect the groups together. */ const Ebl_Core_Item *sorted_items[nitems]; for (size_t i = 0; i < nitems; ++i) sorted_items[i] = &items[i]; qsort (sorted_items, nitems, sizeof sorted_items[0], &compare_core_items); /* Collect the unique groups and sort them. */ const Ebl_Core_Item **groups[nitems]; groups[0] = &sorted_items[0]; size_t ngroups = 1; for (size_t i = 1; i < nitems; ++i) if (sorted_items[i]->group != sorted_items[i - 1]->group && strcmp (sorted_items[i]->group, sorted_items[i - 1]->group)) groups[ngroups++] = &sorted_items[i]; qsort (groups, ngroups, sizeof groups[0], &compare_core_item_groups); /* Write out all the groups. */ const void *last = desc; do { for (size_t i = 0; i < ngroups; ++i) { for (const Ebl_Core_Item **item = groups[i]; (item < &sorted_items[nitems] && ((*item)->group == groups[i][0]->group || !strcmp ((*item)->group, groups[i][0]->group))); ++item) colno = handle_core_item (core, ehdr, *item, desc, colno, NULL); /* Force a line break at the end of the group. */ colno = WRAP_COLUMN; } if (descsz == 0) break; /* This set of items consumed a certain amount of the note's data. If there is more data there, we have another unit of the same size. Loop to print that out too. */ const Ebl_Core_Item *item = &items[nitems - 1]; size_t eltsz = item->offset + gelf_fsize (core, item->type, item->count ?: 1, EV_CURRENT); int reps = -1; do { ++reps; desc += eltsz; descsz -= eltsz; } while (descsz >= eltsz && !memcmp (desc, last, eltsz)); if (reps == 1) { /* For just one repeat, print it unabridged twice. */ desc -= eltsz; descsz += eltsz; } else if (reps > 1) printf (_("\n%*s... <repeats %u more times> ..."), ITEM_INDENT, "", reps); last = desc; } while (descsz > 0); return colno; } static unsigned int handle_core_register (Ebl *ebl, Elf *core, int maxregname, const Ebl_Register_Location *regloc, const void *desc, unsigned int colno) { if (regloc->bits % 8 != 0) { error (0, 0, "Warning: Cannot handle register with %" PRIu8 "bits\n", regloc->bits); return colno; } desc += regloc->offset; for (int reg = regloc->regno; reg < regloc->regno + regloc->count; ++reg) { char name[REGNAMESZ]; int bits; int type; register_info (ebl, reg, regloc, name, &bits, &type); #define TYPES \ BITS (8, BYTE, "%4" PRId8, "0x%.2" PRIx8); \ BITS (16, HALF, "%6" PRId16, "0x%.4" PRIx16); \ BITS (32, WORD, "%11" PRId32, " 0x%.8" PRIx32); \ BITS (64, XWORD, "%20" PRId64, " 0x%.16" PRIx64) #define BITS(bits, xtype, sfmt, ufmt) \ uint##bits##_t b##bits; int##bits##_t b##bits##s union { TYPES; uint64_t b128[2]; } value; #undef BITS switch (type) { case DW_ATE_unsigned: case DW_ATE_signed: case DW_ATE_address: switch (bits) { #define BITS(bits, xtype, sfmt, ufmt) \ case bits: \ desc = convert (core, ELF_T_##xtype, 1, &value, desc, 0); \ if (type == DW_ATE_signed) \ colno = print_core_item (colno, ' ', WRAP_COLUMN, \ maxregname, name, \ sfmt, value.b##bits##s); \ else \ colno = print_core_item (colno, ' ', WRAP_COLUMN, \ maxregname, name, \ ufmt, value.b##bits); \ break TYPES; case 128: assert (type == DW_ATE_unsigned); desc = convert (core, ELF_T_XWORD, 2, &value, desc, 0); int be = elf_getident (core, NULL)[EI_DATA] == ELFDATA2MSB; colno = print_core_item (colno, ' ', WRAP_COLUMN, maxregname, name, "0x%.16" PRIx64 "%.16" PRIx64, value.b128[!be], value.b128[be]); break; default: abort (); #undef BITS } break; default: /* Print each byte in hex, the whole thing in native byte order. */ assert (bits % 8 == 0); const uint8_t *bytes = desc; desc += bits / 8; char hex[bits / 4 + 1]; hex[bits / 4] = '\0'; int incr = 1; if (elf_getident (core, NULL)[EI_DATA] == ELFDATA2LSB) { bytes += bits / 8 - 1; incr = -1; } size_t idx = 0; for (char *h = hex; bits > 0; bits -= 8, idx += incr) { *h++ = "0123456789abcdef"[bytes[idx] >> 4]; *h++ = "0123456789abcdef"[bytes[idx] & 0xf]; } colno = print_core_item (colno, ' ', WRAP_COLUMN, maxregname, name, "0x%s", hex); break; } desc += regloc->pad; #undef TYPES } return colno; } struct register_info { const Ebl_Register_Location *regloc; const char *set; char name[REGNAMESZ]; int regno; int bits; int type; }; static int register_bitpos (const struct register_info *r) { return (r->regloc->offset * 8 + ((r->regno - r->regloc->regno) * (r->regloc->bits + r->regloc->pad * 8))); } static int compare_sets_by_info (const struct register_info *r1, const struct register_info *r2) { return ((int) r2->bits - (int) r1->bits ?: register_bitpos (r1) - register_bitpos (r2)); } /* Sort registers by set, and by size and layout offset within each set. */ static int compare_registers (const void *a, const void *b) { const struct register_info *r1 = a; const struct register_info *r2 = b; /* Unused elements sort last. */ if (r1->regloc == NULL) return r2->regloc == NULL ? 0 : 1; if (r2->regloc == NULL) return -1; return ((r1->set == r2->set ? 0 : strcmp (r1->set, r2->set)) ?: compare_sets_by_info (r1, r2)); } /* Sort register sets by layout offset of the first register in the set. */ static int compare_register_sets (const void *a, const void *b) { const struct register_info *const *p1 = a; const struct register_info *const *p2 = b; return compare_sets_by_info (*p1, *p2); } static inline bool same_set (const struct register_info *a, const struct register_info *b, const struct register_info *regs, size_t maxnreg) { return (a < ®s[maxnreg] && a->regloc != NULL && b < ®s[maxnreg] && b->regloc != NULL && a->bits == b->bits && (a->set == b->set || !strcmp (a->set, b->set))); } static unsigned int handle_core_registers (Ebl *ebl, Elf *core, const void *desc, const Ebl_Register_Location *reglocs, size_t nregloc) { if (nregloc == 0) return 0; ssize_t maxnreg = ebl_register_info (ebl, 0, NULL, 0, NULL, NULL, NULL, NULL); if (maxnreg <= 0) { for (size_t i = 0; i < nregloc; ++i) if (maxnreg < reglocs[i].regno + reglocs[i].count) maxnreg = reglocs[i].regno + reglocs[i].count; assert (maxnreg > 0); } struct register_info regs[maxnreg]; memset (regs, 0, sizeof regs); /* Sort to collect the sets together. */ int maxreg = 0; for (size_t i = 0; i < nregloc; ++i) for (int reg = reglocs[i].regno; reg < reglocs[i].regno + reglocs[i].count; ++reg) { assert (reg < maxnreg); if (reg > maxreg) maxreg = reg; struct register_info *info = ®s[reg]; info->regloc = ®locs[i]; info->regno = reg; info->set = register_info (ebl, reg, ®locs[i], info->name, &info->bits, &info->type); } qsort (regs, maxreg + 1, sizeof regs[0], &compare_registers); /* Collect the unique sets and sort them. */ struct register_info *sets[maxreg + 1]; sets[0] = ®s[0]; size_t nsets = 1; for (int i = 1; i <= maxreg; ++i) if (regs[i].regloc != NULL && !same_set (®s[i], ®s[i - 1], regs, maxnreg)) sets[nsets++] = ®s[i]; qsort (sets, nsets, sizeof sets[0], &compare_register_sets); /* Write out all the sets. */ unsigned int colno = 0; for (size_t i = 0; i < nsets; ++i) { /* Find the longest name of a register in this set. */ size_t maxname = 0; const struct register_info *end; for (end = sets[i]; same_set (sets[i], end, regs, maxnreg); ++end) { size_t len = strlen (end->name); if (len > maxname) maxname = len; } for (const struct register_info *reg = sets[i]; reg < end; reg += reg->regloc->count ?: 1) colno = handle_core_register (ebl, core, maxname, reg->regloc, desc, colno); /* Force a line break at the end of the group. */ colno = WRAP_COLUMN; } return colno; } static void handle_auxv_note (Ebl *ebl, Elf *core, GElf_Word descsz, GElf_Off desc_pos) { Elf_Data *data = elf_getdata_rawchunk (core, desc_pos, descsz, ELF_T_AUXV); if (data == NULL) elf_error: error_exit (0, _("cannot convert core note data: %s"), elf_errmsg (-1)); const size_t nauxv = descsz / gelf_fsize (core, ELF_T_AUXV, 1, EV_CURRENT); for (size_t i = 0; i < nauxv; ++i) { GElf_auxv_t av_mem; GElf_auxv_t *av = gelf_getauxv (data, i, &av_mem); if (av == NULL) goto elf_error; const char *name; const char *fmt; if (ebl_auxv_info (ebl, av->a_type, &name, &fmt) == 0) { /* Unknown type. */ if (av->a_un.a_val == 0) printf (" %" PRIu64 "\n", av->a_type); else printf (" %" PRIu64 ": %#" PRIx64 "\n", av->a_type, av->a_un.a_val); } else switch (fmt[0]) { case '\0': /* Normally zero. */ if (av->a_un.a_val == 0) { printf (" %s\n", name); break; } FALLTHROUGH; case 'x': /* hex */ case 'p': /* address */ case 's': /* address of string */ printf (" %s: %#" PRIx64 "\n", name, av->a_un.a_val); break; case 'u': printf (" %s: %" PRIu64 "\n", name, av->a_un.a_val); break; case 'd': printf (" %s: %" PRId64 "\n", name, av->a_un.a_val); break; case 'b': printf (" %s: %#" PRIx64 " ", name, av->a_un.a_val); GElf_Xword bit = 1; const char *pfx = "<"; for (const char *p = fmt + 1; *p != 0; p = strchr (p, '\0') + 1) { if (av->a_un.a_val & bit) { printf ("%s%s", pfx, p); pfx = " "; } bit <<= 1; } printf (">\n"); break; default: abort (); } } } static bool buf_has_data (unsigned char const *ptr, unsigned char const *end, size_t sz) { return ptr < end && (size_t) (end - ptr) >= sz; } static bool buf_read_int (Elf *core, unsigned char const **ptrp, unsigned char const *end, int *retp) { if (! buf_has_data (*ptrp, end, 4)) return false; *ptrp = convert (core, ELF_T_WORD, 1, retp, *ptrp, 4); return true; } static bool buf_read_ulong (Elf *core, unsigned char const **ptrp, unsigned char const *end, uint64_t *retp) { size_t sz = gelf_fsize (core, ELF_T_ADDR, 1, EV_CURRENT); if (! buf_has_data (*ptrp, end, sz)) return false; union { uint64_t u64; uint32_t u32; } u; *ptrp = convert (core, ELF_T_ADDR, 1, &u, *ptrp, sz); if (sz == 4) *retp = u.u32; else *retp = u.u64; return true; } static void handle_siginfo_note (Elf *core, GElf_Word descsz, GElf_Off desc_pos) { Elf_Data *data = elf_getdata_rawchunk (core, desc_pos, descsz, ELF_T_BYTE); if (data == NULL) error_exit (0, _("cannot convert core note data: %s"), elf_errmsg (-1)); unsigned char const *ptr = data->d_buf; unsigned char const *const end = data->d_buf + data->d_size; /* Siginfo head is three ints: signal number, error number, origin code. */ int si_signo, si_errno, si_code; if (! buf_read_int (core, &ptr, end, &si_signo) || ! buf_read_int (core, &ptr, end, &si_errno) || ! buf_read_int (core, &ptr, end, &si_code)) { fail: printf (" Not enough data in NT_SIGINFO note.\n"); return; } /* Next is a pointer-aligned union of structures. On 64-bit machines, that implies a word of padding. */ if (gelf_getclass (core) == ELFCLASS64) ptr += 4; printf (" si_signo: %d, si_errno: %d, si_code: %d\n", si_signo, si_errno, si_code); if (si_code > 0) switch (si_signo) { case CORE_SIGILL: case CORE_SIGFPE: case CORE_SIGSEGV: case CORE_SIGBUS: { uint64_t addr; if (! buf_read_ulong (core, &ptr, end, &addr)) goto fail; printf (" fault address: %#" PRIx64 "\n", addr); break; } default: ; } else if (si_code == CORE_SI_USER) { int pid, uid; if (! buf_read_int (core, &ptr, end, &pid) || ! buf_read_int (core, &ptr, end, &uid)) goto fail; printf (" sender PID: %d, sender UID: %d\n", pid, uid); } } static void handle_file_note (Elf *core, GElf_Word descsz, GElf_Off desc_pos) { Elf_Data *data = elf_getdata_rawchunk (core, desc_pos, descsz, ELF_T_BYTE); if (data == NULL) error_exit (0, _("cannot convert core note data: %s"), elf_errmsg (-1)); unsigned char const *ptr = data->d_buf; unsigned char const *const end = data->d_buf + data->d_size; uint64_t count, page_size; if (! buf_read_ulong (core, &ptr, end, &count) || ! buf_read_ulong (core, &ptr, end, &page_size)) { fail: printf (" Not enough data in NT_FILE note.\n"); return; } size_t addrsize = gelf_fsize (core, ELF_T_ADDR, 1, EV_CURRENT); uint64_t maxcount = (size_t) (end - ptr) / (3 * addrsize); if (count > maxcount) goto fail; /* Where file names are stored. */ unsigned char const *const fstart = ptr + 3 * count * addrsize; char const *fptr = (char *) fstart; printf (" %" PRId64 " files:\n", count); for (uint64_t i = 0; i < count; ++i) { uint64_t mstart, mend, moffset; if (! buf_read_ulong (core, &ptr, fstart, &mstart) || ! buf_read_ulong (core, &ptr, fstart, &mend) || ! buf_read_ulong (core, &ptr, fstart, &moffset)) goto fail; const char *fnext = memchr (fptr, '\0', (char *) end - fptr); if (fnext == NULL) goto fail; int ct = printf (" %08" PRIx64 "-%08" PRIx64 " %08" PRIx64 " %" PRId64, mstart, mend, moffset * page_size, mend - mstart); printf ("%*s%s\n", ct > 50 ? 3 : 53 - ct, "", fptr); fptr = fnext + 1; } } static void handle_core_note (Ebl *ebl, const GElf_Ehdr *ehdr, const GElf_Nhdr *nhdr, const char *name, const void *desc) { GElf_Word regs_offset; size_t nregloc; const Ebl_Register_Location *reglocs; size_t nitems; const Ebl_Core_Item *items; if (! ebl_core_note (ebl, nhdr, name, desc, ®s_offset, &nregloc, ®locs, &nitems, &items)) return; /* Pass 0 for DESCSZ when there are registers in the note, so that the ITEMS array does not describe the whole thing. For non-register notes, the actual descsz might be a multiple of the unit size, not just exactly the unit size. */ unsigned int colno = handle_core_items (ebl->elf, ehdr, desc, nregloc == 0 ? nhdr->n_descsz : 0, items, nitems); if (colno != 0) putchar ('\n'); colno = handle_core_registers (ebl, ebl->elf, desc + regs_offset, reglocs, nregloc); if (colno != 0) putchar ('\n'); } static void handle_notes_data (Ebl *ebl, const GElf_Ehdr *ehdr, GElf_Off start, Elf_Data *data) { fputs (_(" Owner Data size Type\n"), stdout); if (data == NULL) goto bad_note; size_t offset = 0; GElf_Nhdr nhdr; size_t name_offset; size_t desc_offset; while (offset < data->d_size && (offset = gelf_getnote (data, offset, &nhdr, &name_offset, &desc_offset)) > 0) { const char *name = nhdr.n_namesz == 0 ? "" : data->d_buf + name_offset; const char *desc = data->d_buf + desc_offset; /* GNU Build Attributes are weird, they store most of their data into the owner name field. Extract just the owner name prefix here, then use the rest later as data. */ bool is_gnu_build_attr = startswith (name, ELF_NOTE_GNU_BUILD_ATTRIBUTE_PREFIX); const char *print_name = (is_gnu_build_attr ? ELF_NOTE_GNU_BUILD_ATTRIBUTE_PREFIX : name); size_t print_namesz = (is_gnu_build_attr ? strlen (print_name) : nhdr.n_namesz); char buf[100]; char buf2[100]; printf (_(" %-13.*s %9" PRId32 " %s\n"), (int) print_namesz, print_name, nhdr.n_descsz, ehdr->e_type == ET_CORE ? ebl_core_note_type_name (ebl, nhdr.n_type, buf, sizeof (buf)) : ebl_object_note_type_name (ebl, name, nhdr.n_type, nhdr.n_descsz, buf2, sizeof (buf2))); /* Filter out invalid entries. */ if (memchr (name, '\0', nhdr.n_namesz) != NULL /* XXX For now help broken Linux kernels. */ || 1) { if (ehdr->e_type == ET_CORE) { if (nhdr.n_type == NT_AUXV && (nhdr.n_namesz == 4 /* Broken old Linux kernels. */ || (nhdr.n_namesz == 5 && name[4] == '\0')) && !memcmp (name, "CORE", 4)) handle_auxv_note (ebl, ebl->elf, nhdr.n_descsz, start + desc_offset); else if (nhdr.n_namesz == 5 && strcmp (name, "CORE") == 0) switch (nhdr.n_type) { case NT_SIGINFO: handle_siginfo_note (ebl->elf, nhdr.n_descsz, start + desc_offset); break; case NT_FILE: handle_file_note (ebl->elf, nhdr.n_descsz, start + desc_offset); break; default: handle_core_note (ebl, ehdr, &nhdr, name, desc); } else handle_core_note (ebl, ehdr, &nhdr, name, desc); } else ebl_object_note (ebl, nhdr.n_namesz, name, nhdr.n_type, nhdr.n_descsz, desc); } } if (offset == data->d_size) return; bad_note: error (0, 0, _("cannot get content of note: %s"), data != NULL ? "garbage data" : elf_errmsg (-1)); } static void handle_notes (Ebl *ebl, GElf_Ehdr *ehdr) { /* If we have section headers, just look for SHT_NOTE sections. In a debuginfo file, the program headers are not reliable. */ if (shnum != 0) { /* Get the section header string table index. */ size_t shstrndx; if (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0) error_exit (0, _("cannot get section header string table index")); Elf_Scn *scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { GElf_Shdr shdr_mem; GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr == NULL || shdr->sh_type != SHT_NOTE) /* Not what we are looking for. */ continue; if (notes_section != NULL) { char *sname = elf_strptr (ebl->elf, shstrndx, shdr->sh_name); if (sname == NULL || strcmp (sname, notes_section) != 0) continue; } printf (_("\ \nNote section [%2zu] '%s' of %" PRIu64 " bytes at offset %#0" PRIx64 ":\n"), elf_ndxscn (scn), elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_size, shdr->sh_offset); handle_notes_data (ebl, ehdr, shdr->sh_offset, elf_getdata (scn, NULL)); } return; } /* We have to look through the program header to find the note sections. There can be more than one. */ for (size_t cnt = 0; cnt < phnum; ++cnt) { GElf_Phdr mem; GElf_Phdr *phdr = gelf_getphdr (ebl->elf, cnt, &mem); if (phdr == NULL || phdr->p_type != PT_NOTE) /* Not what we are looking for. */ continue; printf (_("\ \nNote segment of %" PRIu64 " bytes at offset %#0" PRIx64 ":\n"), phdr->p_filesz, phdr->p_offset); handle_notes_data (ebl, ehdr, phdr->p_offset, elf_getdata_rawchunk (ebl->elf, phdr->p_offset, phdr->p_filesz, (phdr->p_align == 8 ? ELF_T_NHDR8 : ELF_T_NHDR))); } } static void hex_dump (const uint8_t *data, size_t len) { size_t pos = 0; while (pos < len) { printf (" 0x%08zx ", pos); const size_t chunk = MIN (len - pos, 16); for (size_t i = 0; i < chunk; ++i) if (i % 4 == 3) printf ("%02x ", data[pos + i]); else printf ("%02x", data[pos + i]); if (chunk < 16) printf ("%*s", (int) ((16 - chunk) * 2 + (16 - chunk + 3) / 4), ""); for (size_t i = 0; i < chunk; ++i) { unsigned char b = data[pos + i]; printf ("%c", isprint (b) ? b : '.'); } putchar ('\n'); pos += chunk; } } static void dump_data_section (Elf_Scn *scn, const GElf_Shdr *shdr, const char *name) { if (shdr->sh_size == 0 || shdr->sh_type == SHT_NOBITS) printf (_("\nSection [%zu] '%s' has no data to dump.\n"), elf_ndxscn (scn), name); else { if (print_decompress) { /* We try to decompress the section, but keep the old shdr around so we can show both the original shdr size and the uncompressed data size. */ if ((shdr->sh_flags & SHF_COMPRESSED) != 0) { if (elf_compress (scn, 0, 0) < 0) printf ("WARNING: %s [%zd]\n", _("Couldn't uncompress section"), elf_ndxscn (scn)); } else if (name && startswith (name, ".zdebug")) { if (elf_compress_gnu (scn, 0, 0) < 0) printf ("WARNING: %s [%zd]\n", _("Couldn't uncompress section"), elf_ndxscn (scn)); } } Elf_Data *data = elf_rawdata (scn, NULL); if (data == NULL) error (0, 0, _("cannot get data for section [%zu] '%s': %s"), elf_ndxscn (scn), name, elf_errmsg (-1)); else { if (data->d_size == shdr->sh_size) printf (_("\nHex dump of section [%zu] '%s', %" PRIu64 " bytes at offset %#0" PRIx64 ":\n"), elf_ndxscn (scn), name, shdr->sh_size, shdr->sh_offset); else printf (_("\nHex dump of section [%zu] '%s', %" PRIu64 " bytes (%zd uncompressed) at offset %#0" PRIx64 ":\n"), elf_ndxscn (scn), name, shdr->sh_size, data->d_size, shdr->sh_offset); hex_dump (data->d_buf, data->d_size); } } } static void print_string_section (Elf_Scn *scn, const GElf_Shdr *shdr, const char *name) { if (shdr->sh_size == 0 || shdr->sh_type == SHT_NOBITS) printf (_("\nSection [%zu] '%s' has no strings to dump.\n"), elf_ndxscn (scn), name); else { if (print_decompress) { /* We try to decompress the section, but keep the old shdr around so we can show both the original shdr size and the uncompressed data size. */ if ((shdr->sh_flags & SHF_COMPRESSED) != 0) { if (elf_compress (scn, 0, 0) < 0) printf ("WARNING: %s [%zd]\n", _("Couldn't uncompress section"), elf_ndxscn (scn)); } else if (name && startswith (name, ".zdebug")) { if (elf_compress_gnu (scn, 0, 0) < 0) printf ("WARNING: %s [%zd]\n", _("Couldn't uncompress section"), elf_ndxscn (scn)); } } Elf_Data *data = elf_rawdata (scn, NULL); if (data == NULL) error (0, 0, _("cannot get data for section [%zu] '%s': %s"), elf_ndxscn (scn), name, elf_errmsg (-1)); else { if (data->d_size == shdr->sh_size) printf (_("\nString section [%zu] '%s' contains %" PRIu64 " bytes at offset %#0" PRIx64 ":\n"), elf_ndxscn (scn), name, shdr->sh_size, shdr->sh_offset); else printf (_("\nString section [%zu] '%s' contains %" PRIu64 " bytes (%zd uncompressed) at offset %#0" PRIx64 ":\n"), elf_ndxscn (scn), name, shdr->sh_size, data->d_size, shdr->sh_offset); const char *start = data->d_buf; const char *const limit = start + data->d_size; do { const char *end = memchr (start, '\0', limit - start); const size_t pos = start - (const char *) data->d_buf; if (unlikely (end == NULL)) { printf (" [%6zx]- %.*s\n", pos, (int) (limit - start), start); break; } printf (" [%6zx] %s\n", pos, start); start = end + 1; } while (start < limit); } } } static void for_each_section_argument (Elf *elf, const struct section_argument *list, void (*dump) (Elf_Scn *scn, const GElf_Shdr *shdr, const char *name)) { /* Get the section header string table index. */ size_t shstrndx; if (elf_getshdrstrndx (elf, &shstrndx) < 0) error_exit (0, _("cannot get section header string table index")); for (const struct section_argument *a = list; a != NULL; a = a->next) { Elf_Scn *scn; GElf_Shdr shdr_mem; const char *name = NULL; char *endp = NULL; unsigned long int shndx = strtoul (a->arg, &endp, 0); if (endp != a->arg && *endp == '\0') { scn = elf_getscn (elf, shndx); if (scn == NULL) { error (0, 0, _("\nsection [%lu] does not exist"), shndx); continue; } if (gelf_getshdr (scn, &shdr_mem) == NULL) error_exit (0, _("cannot get section header: %s"), elf_errmsg (-1)); name = elf_strptr (elf, shstrndx, shdr_mem.sh_name); (*dump) (scn, &shdr_mem, name); } else { /* Need to look up the section by name. */ scn = NULL; bool found = false; while ((scn = elf_nextscn (elf, scn)) != NULL) { if (gelf_getshdr (scn, &shdr_mem) == NULL) continue; name = elf_strptr (elf, shstrndx, shdr_mem.sh_name); if (name == NULL) continue; if (!strcmp (name, a->arg)) { found = true; (*dump) (scn, &shdr_mem, name); } } if (unlikely (!found) && !a->implicit) error (0, 0, _("\nsection '%s' does not exist"), a->arg); } } } static void dump_data (Ebl *ebl) { for_each_section_argument (ebl->elf, dump_data_sections, &dump_data_section); } static void dump_strings (Ebl *ebl) { for_each_section_argument (ebl->elf, string_sections, &print_string_section); } static void print_strings (Ebl *ebl) { /* Get the section header string table index. */ size_t shstrndx; if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)) error_exit (0, _("cannot get section header string table index")); Elf_Scn *scn; GElf_Shdr shdr_mem; const char *name; scn = NULL; while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) { if (gelf_getshdr (scn, &shdr_mem) == NULL) continue; if (shdr_mem.sh_type != SHT_PROGBITS || !(shdr_mem.sh_flags & SHF_STRINGS)) continue; name = elf_strptr (ebl->elf, shstrndx, shdr_mem.sh_name); if (name == NULL) continue; print_string_section (scn, &shdr_mem, name); } } static void dump_archive_index (Elf *elf, const char *fname) { size_t narsym; const Elf_Arsym *arsym = elf_getarsym (elf, &narsym); if (arsym == NULL) { int result = elf_errno (); if (unlikely (result != ELF_E_NO_INDEX)) error_exit (0, _("cannot get symbol index of archive '%s': %s"), fname, elf_errmsg (result)); else printf (_("\nArchive '%s' has no symbol index\n"), fname); return; } printf (_("\nIndex of archive '%s' has %zu entries:\n"), fname, narsym); size_t as_off = 0; for (const Elf_Arsym *s = arsym; s < &arsym[narsym - 1]; ++s) { if (s->as_off != as_off) { as_off = s->as_off; Elf *subelf = NULL; if (unlikely (elf_rand (elf, as_off) == 0) || unlikely ((subelf = elf_begin (-1, ELF_C_READ_MMAP, elf)) == NULL)) #if __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 7) while (1) #endif error_exit (0, _("cannot extract member at offset %zu in '%s': %s"), as_off, fname, elf_errmsg (-1)); const Elf_Arhdr *h = elf_getarhdr (subelf); if (h != NULL) printf (_("Archive member '%s' contains:\n"), h->ar_name); elf_end (subelf); } printf ("\t%s\n", s->as_name); } } #include "debugpred.h"