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.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
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