ref: 1c5aa84742e3804a13a2d8fb990d82a6e493bf5a
dir: /test/hello/syscall.s/
.globl sys$syscall
sys$syscall:
pushl %ebp
movl %esp,%ebp
movl 12(%ebp),%eax #count
shl $2,%eax
jmp *.jmptab(%eax)
.jmptab:
.long .a0
.long .a1
.long .a2
.long .a3
.long .a4
.a5: movl 32(%ebp),%edi
.a4: movl 28(%ebp),%esi
.a3: movl 24(%ebp),%edx
.a2: movl 20(%ebp),%ecx
.a1: movl 16(%ebp),%ebx
/* 12(%ebp) holds nargs */
.a0: movl 8(%ebp),%eax
int $0x80
movl %ebp,%esp
popl %ebp
ret