| |
| .section ".data" |
| .globl linux_errno |
| |
| linux_errno: .int 0 |
| |
| .section ".text" |
| .code32 |
| .globl linux_syscall |
| .type linux_syscall, @function |
| |
| linux_syscall: |
| /* Save registers */ |
| pushl %ebx |
| pushl %esi |
| pushl %edi |
| pushl %ebp |
| |
| movl 20(%esp), %eax // C arg1 -> syscall number |
| movl 24(%esp), %ebx // C arg2 -> syscall arg1 |
| movl 28(%esp), %ecx // C arg3 -> syscall arg2 |
| movl 32(%esp), %edx // C arg4 -> syscall arg3 |
| movl 36(%esp), %esi // C arg5 -> syscall arg4 |
| movl 40(%esp), %edi // C arg6 -> syscall arg5 |
| movl 44(%esp), %ebp // C arg7 -> syscall arg6 |
| |
| int $0x80 |
| |
| /* Restore registers */ |
| popl %ebp |
| popl %edi |
| popl %esi |
| popl %ebx |
| |
| cmpl $-4095, %eax |
| jae 1f |
| ret |
| |
| 1: |
| negl %eax |
| movl %eax, linux_errno |
| movl $-1, %eax |
| ret |
| |
| .size linux_syscall, . - linux_syscall |
