AT&T ASSEMBLY FOR LINUX AND MAC (SYS_FORK)

Fork() in C: (sys_fork.c)

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(void)
{
    fork();
    printf("Hello Landpack\n");
    return ;
}

Fork() in AT&T for Linux:(sys_fork.s)

.section .rodata
msg:    .ascii "Hello Landpack\n"
    len = .-msg

.section .bass

.section .text
.globl _start
_start:
    movl    $,%eax     # sys_fork number ()
    int     $0x80

# As we know,if we fork() in C
# we will run the double process
# They almost have the same code and data

    movl    $,%eax     # sys_write number ()
    movl    $,%ebx     # STDOUT_FILENO == ()
    movl    $msg,%ecx   # The head address of msg
    movl    $len,%edx   # The offset of addr
    int     $0x80

    movl    $,%eax
    movl    $,%ebx
    int     $0x80