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Add generic support for syscalls for Linux/i386

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This commit is contained in:
Pierre Pronchery 2018-08-25 01:48:28 +02:00
parent 8b564a43da
commit 2afdb3854c
1 changed files with 18 additions and 0 deletions
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18
tools/arch/i386/start.S
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@ -5,8 +5,26 @@
.section .text
_syscall:
#ifdef __linux__
push %ebx
push %esi
push %edi
mov 0x10(%esp), %ebx
mov 0x14(%esp), %ecx
mov 0x18(%esp), %edx
mov 0x1c(%esp), %esi
mov 0x20(%esp), %edi
int $0x80
pop %edi
pop %esi
pop %ebx
cmp $0, %eax
jge .errnoret
neg %eax
#else
int $0x80
jnc .errnoret
#endif
.errno:
mov %eax, errno
mov $-1, %eax