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src/linux/x86_64/get_syscall_args.c
50 строк
2 KB
Dmitry V. Levin
Update copyright headers
16 фев 2021, 11:00
16 фев 2021, 11:00
8fa8a88
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/* * Copyright (c) 2015-2021 The strace developers. * All rights reserved. * * SPDX-License-Identifier: LGPL-2.1-or-later */ /* Return -1 on error or 1 on success (never 0!). */ static int arch_get_syscall_args(struct tcb *tcp) { if (x86_io.iov_len != sizeof(i386_regs)) { /* x86-64 or x32 ABI */ if (tcp_sysent(tcp)->sys_flags & COMPAT_SYSCALL_TYPES) { /* * X32 compat syscall: zero-extend from 32 bits. * Use truncate_klong_to_current_wordsize(tcp->u_arg[N]) * in syscall handlers * if you need to use *sign-extended* parameter. */ tcp->u_arg[0] = (uint32_t) x86_64_regs.rdi; tcp->u_arg[1] = (uint32_t) x86_64_regs.rsi; tcp->u_arg[2] = (uint32_t) x86_64_regs.rdx; tcp->u_arg[3] = (uint32_t) x86_64_regs.r10; tcp->u_arg[4] = (uint32_t) x86_64_regs.r8; tcp->u_arg[5] = (uint32_t) x86_64_regs.r9; } else { tcp->u_arg[0] = x86_64_regs.rdi; tcp->u_arg[1] = x86_64_regs.rsi; tcp->u_arg[2] = x86_64_regs.rdx; tcp->u_arg[3] = x86_64_regs.r10; tcp->u_arg[4] = x86_64_regs.r8; tcp->u_arg[5] = x86_64_regs.r9; } } else { /* * i386 ABI: zero-extend from 32 bits. * Use truncate_klong_to_current_wordsize(tcp->u_arg[N]) * in syscall handlers * if you need to use *sign-extended* parameter. */ tcp->u_arg[0] = (uint32_t) i386_regs.ebx; tcp->u_arg[1] = (uint32_t) i386_regs.ecx; tcp->u_arg[2] = (uint32_t) i386_regs.edx; tcp->u_arg[3] = (uint32_t) i386_regs.esi; tcp->u_arg[4] = (uint32_t) i386_regs.edi; tcp->u_arg[5] = (uint32_t) i386_regs.ebp; } return 1; }