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