#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <string.h>

int test (int a, int b)
{
  char code[] = {
     0x90, 0x90, 0x6A, 0xC, 0xB8, 0x7, 0x0, 0x0, 0x0, 0x48, 0xC1, 0xE0, 0x20,
     0x50, 0x8B, 0x44, 0x24, 0x4, 0x3, 0x44, 0x24, 0x8, 0x4C, 0x89, 0xE3, 0x89,
     0xC3, 0x48, 0xC1, 0xE3, 0x4, 0x80, 0xCB, 0x2, 0x48, 0x83, 0xC4, 0x10, 0xC3
  };

  void *buf;
  int c;
  /* copy code to executable buffer */
  buf = mmap (0,sizeof(code),PROT_READ|PROT_WRITE|PROT_EXEC,
             MAP_PRIVATE|MAP_ANON,-1,0);
  memcpy (buf, code, sizeof(code));
  /* run code */
  c = ((int (*) (int, int))buf)(a, b);
  /* free buffer */
  munmap (buf, sizeof(code));
  return c;
}