By liran bh | 5/16/2016 | Linux User Space

Calling System Call Directly

#include <stdio.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <unistd.h>
int myadd(int a,int b)
    int res;
    asm volatile ("movl $320,%%eax; movl %1,%%ebx; movl %2,%%ecx;int $0x80; movl %%eax,%0;":
            "=r"(res): "r"(a),"r"(b) : "eax","ebx","ecx");
    return res;
int main(void) {
    int x=9,y=8,z;
    puts("!!!Hello World!!!"); /* prints !!!Hello World!!! */
    return EXIT_SUCCESS;

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