inline assembly

mingW

#include <stdio.h>

get_sp(int *eip){

asm (

"mov %esp, %eax\n"

"mov 4(%ebp), %ebx\n" // ebx isi eip

"lea 8(%ebp), %ecx\n"

"mov (%ecx), %ecx\n"

"mov %ebx, (%ecx)\n"

);

}

void main(){

int x = 5;

asm( "int3");

printf ("StackPointer (ESP): 0x%x\n", get_sp(&x));

printf ("EIP: 0x%x\n", x);

}

cl (visual studio)

#include <stdio.h>

get_sp(int *eip){

__asm{ 

mov eax, esp

mov ebx, [ebp+4]

lea ecx,[ebp+8]

mov ecx, [ecx]

mov [ecx], ebx

}

}

void main(){

int x = 5;

__asm {int 3};

printf ("StackPointer (ESP): 0x%x\n", get_sp(&x));

printf ("EIP: 0x%x\n", x);

}