ref: 6047575d5d08efd7d0f1cd3b837b90d0d1150c30
dir: /syscall.s/
.globl std$syscall
std$syscall:
pushl %ebp
movl %esp,%ebp
movl 12(%ebp),%eax #count
shl $2,%eax
/*
hack: 6 args uses %ebp, so we index
relative to %esp.
hack: We load 6 args regardless of
how many we actually have. This may
load junk values, but if the syscall
doesn't use them, it's going to be
harmless.
*/
movl 32(%esp),%ebp
movl 28(%esp),%edi
movl 24(%esp),%esi
movl 20(%esp),%edx
movl 16(%esp),%ecx
movl 12(%esp),%ebx
movl 8(%esp),%eax
int $0x80
movl %ebp,%esp
popl %ebp
ret
.globl _std$syscall
_std$syscall:
popl %ecx /* return address */
popl %eax /* call num */
pushl %ecx
int $0x80
pushl %ecx /* put the return address back */
ret