Machine code: Difference between revisions

=={{header|C}}==

<lang C>#include <stdio.h>

#include <sys/mman.h>

#include <string.h>

int test (int a, int b)

{

/*

mov EAX, [ESP+4]

add EAX, [ESP+8]

ret

*/

char code[] = {0x8B, 0x44, 0x24, 0x4, 0x3, 0x44, 0x24, 0x8, 0xC3};

void *buf;

/* 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 */

return ((int (*) (int, int))buf)(a, b);

}

int main ()

{

printf("%d\n", test(7,12));

return 0;

}</lang>