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/*
* Copyright (c) 2015-2019 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;
}
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