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44 lines
1.4 KiB
44 lines
1.4 KiB
/* Return -1 on error or 1 on success (never 0!). */
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static int
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get_syscall_args(struct tcb *tcp)
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{
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if (x86_io.iov_len != sizeof(i386_regs)) {
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/* x86-64 or x32 ABI */
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if (tcp->s_ent->sys_flags & COMPAT_SYSCALL_TYPES) {
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/*
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* X32 compat syscall: zero-extend from 32 bits.
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* Use truncate_klong_to_current_wordsize(tcp->u_arg[N])
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* in syscall handlers
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* if you need to use *sign-extended* parameter.
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*/
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tcp->u_arg[0] = (uint32_t) x86_64_regs.rdi;
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tcp->u_arg[1] = (uint32_t) x86_64_regs.rsi;
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tcp->u_arg[2] = (uint32_t) x86_64_regs.rdx;
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tcp->u_arg[3] = (uint32_t) x86_64_regs.r10;
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tcp->u_arg[4] = (uint32_t) x86_64_regs.r8;
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tcp->u_arg[5] = (uint32_t) x86_64_regs.r9;
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} else {
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tcp->u_arg[0] = x86_64_regs.rdi;
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tcp->u_arg[1] = x86_64_regs.rsi;
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tcp->u_arg[2] = x86_64_regs.rdx;
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tcp->u_arg[3] = x86_64_regs.r10;
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tcp->u_arg[4] = x86_64_regs.r8;
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tcp->u_arg[5] = x86_64_regs.r9;
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}
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} else {
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/*
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* i386 ABI: zero-extend from 32 bits.
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* Use truncate_klong_to_current_wordsize(tcp->u_arg[N])
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* in syscall handlers
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* if you need to use *sign-extended* parameter.
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*/
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tcp->u_arg[0] = (uint32_t) i386_regs.ebx;
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tcp->u_arg[1] = (uint32_t) i386_regs.ecx;
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tcp->u_arg[2] = (uint32_t) i386_regs.edx;
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tcp->u_arg[3] = (uint32_t) i386_regs.esi;
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tcp->u_arg[4] = (uint32_t) i386_regs.edi;
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tcp->u_arg[5] = (uint32_t) i386_regs.ebp;
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}
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return 1;
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}
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