| /* Return -1 on error or 1 on success (never 0!). */ |
| static int |
| get_syscall_args(struct tcb *tcp) |
| { |
| if (x86_io.iov_len != sizeof(i386_regs)) { |
| /* x86-64 or x32 ABI */ |
| if (tcp->s_ent->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; |
| } |