Assembly Example - ARM

   .globl addfn;

addfn:
        add r0,r0,r1;
        mov pc,lr;



========================= C code ========================

#include <stdio.h>
#include <stdlib.h>
 
extern int addfn(int,int);
 
int main(void) {
    int res;
    res=addfn(10,20);
    printf("res=%d\n",res); /* prints !!!Hello World!!! */
    return EXIT_SUCCESS;
}