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master
cli/dl-cache.h
184 строки
6 KB
Cody Tapscott
Avoid using `fork()` when probing system `libstdc++` (#60254)
03 дек 2025, 17:00
Не верифицирован
03 дек 2025, 17:00
ac4ee59
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/* Support for reading /etc/ld.so.cache files written by Linux ldconfig. Copyright (C) 1999-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <stdint.h> #define FLAG_ANY -1 #define FLAG_TYPE_MASK 0x00ff #define FLAG_LIBC4 0x0000 #define FLAG_ELF 0x0001 #define FLAG_ELF_LIBC5 0x0002 #define FLAG_ELF_LIBC6 0x0003 #define FLAG_REQUIRED_MASK 0xff00 #define FLAG_SPARC_LIB64 0x0100 #define FLAG_IA64_LIB64 0x0200 #define FLAG_X8664_LIB64 0x0300 #define FLAG_S390_LIB64 0x0400 #define FLAG_POWERPC_LIB64 0x0500 #define FLAG_MIPS64_LIBN32 0x0600 #define FLAG_MIPS64_LIBN64 0x0700 #define FLAG_X8664_LIBX32 0x0800 #define FLAG_ARM_LIBHF 0x0900 #define FLAG_AARCH64_LIB64 0x0a00 #define FLAG_ARM_LIBSF 0x0b00 #define FLAG_MIPS_LIB32_NAN2008 0x0c00 #define FLAG_MIPS64_LIBN32_NAN2008 0x0d00 #define FLAG_MIPS64_LIBN64_NAN2008 0x0e00 #define FLAG_RISCV_FLOAT_ABI_SOFT 0x0f00 #define FLAG_RISCV_FLOAT_ABI_DOUBLE 0x1000 #if defined(_CPU_X86_64_) #define _DL_CACHE_DEFAULT_ID 0x303 #define _dl_cache_check_flags(flags) ((flags) == _DL_CACHE_DEFAULT_ID) #elif defined(_CPU_AARCH64_) #ifdef __LP64__ # define _DL_CACHE_DEFAULT_ID (FLAG_AARCH64_LIB64 | FLAG_ELF_LIBC6) #else # define _DL_CACHE_DEFAULT_ID (FLAG_AARCH64_LIB32 | FLAG_ELF_LIBC6) #endif #define _dl_cache_check_flags(flags) ((flags) == _DL_CACHE_DEFAULT_ID) #elif defined(_CPU_RISCV64_) /* For now we only support the natural XLEN ABI length on all targets, so the only bits that need to go into ld.so.cache are the flags for ABI length. */ #if defined __riscv_float_abi_double # define _DL_CACHE_DEFAULT_ID (FLAG_RISCV_FLOAT_ABI_DOUBLE | FLAG_ELF_LIBC6) #else # define _DL_CACHE_DEFAULT_ID (FLAG_RISCV_FLOAT_ABI_SOFT | FLAG_ELF_LIBC6) #endif #define _dl_cache_check_flags(flags) ((flags) == _DL_CACHE_DEFAULT_ID) #elif defined(_CPU_ARM_) /* In order to support the transition from unmarked objects to marked objects we must treat unmarked objects as compatible with either FLAG_ARM_LIBHF or FLAG_ARM_LIBSF. */ #ifdef __ARM_PCS_VFP # define _dl_cache_check_flags(flags) \ ((flags) == (FLAG_ARM_LIBHF | FLAG_ELF_LIBC6) \ || (flags) == FLAG_ELF_LIBC6) #else # define _dl_cache_check_flags(flags) \ ((flags) == (FLAG_ARM_LIBSF | FLAG_ELF_LIBC6) \ || (flags) == FLAG_ELF_LIBC6) #endif #elif defined(_CPU_X86_) /* Defined as (FLAG_ELF_LIBC6 | FLAG_X8664_LIBX32). */ #undef _DL_CACHE_DEFAULT_ID #define _DL_CACHE_DEFAULT_ID 0x803 #elif defined(_CPU_PPC64_) #define _DL_CACHE_DEFAULT_ID 0x503 #define _dl_cache_check_flags(flags) \ ((flags) == _DL_CACHE_DEFAULT_ID) #else #error "Missing CPU arch-specific definitions in dl-cache.h" #endif #ifndef _DL_CACHE_DEFAULT_ID # define _DL_CACHE_DEFAULT_ID 3 #endif #ifndef _dl_cache_check_flags # define _dl_cache_check_flags(flags) \ ((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID) #endif #ifndef LD_SO_CACHE # define LD_SO_CACHE SYSCONFDIR "/ld.so.cache" #endif #define CACHEMAGIC "ld.so-1.7.0" /* libc5 and glibc 2.0/2.1 use the same format. For glibc 2.2 another format has been added in a compatible way: The beginning of the string table is used for the new table: old_magic nlibs libs[0] ... libs[nlibs-1] pad, new magic needs to be aligned - this is string[0] for the old format new magic - this is string[0] for the new format newnlibs ... newlibs[0] ... newlibs[newnlibs-1] string 1 string 2 ... */ struct file_entry { int flags; /* This is 1 for an ELF library. */ unsigned int key, value; /* String table indices. */ }; struct cache_file { char magic[sizeof CACHEMAGIC - 1]; unsigned int nlibs; struct file_entry libs[0]; }; #define CACHEMAGIC_NEW "glibc-ld.so.cache" #define CACHE_VERSION "1.1" #define CACHEMAGIC_VERSION_NEW CACHEMAGIC_NEW CACHE_VERSION struct file_entry_new { int32_t flags; /* This is 1 for an ELF library. */ uint32_t key, value; /* String table indices. */ uint32_t osversion; /* Required OS version. */ uint64_t hwcap; /* Hwcap entry. */ }; struct cache_file_new { char magic[sizeof CACHEMAGIC_NEW - 1]; char version[sizeof CACHE_VERSION - 1]; uint32_t nlibs; /* Number of entries. */ uint32_t len_strings; /* Size of string table. */ uint32_t unused[5]; /* Leave space for future extensions and align to 8 byte boundary. */ struct file_entry_new libs[0]; /* Entries describing libraries. */ /* After this the string table of size len_strings is found. */ }; /* Used to align cache_file_new. */ #define ALIGN_CACHE(addr) \ (((addr) + __alignof__ (struct cache_file_new) -1) \ & (~(__alignof__ (struct cache_file_new) - 1))) // extern int _dl_cache_libcmp (const char *p1, const char *p2) attribute_hidden;