x64hook/main.c

#include <stdio.h>
#include "misc.h"
#include "hook.h"

#if 0
Check whether trampoline works correctly
start:
	je lbl1
	jmp lbl1
lbl1:

---
hook() == LOOPS_INTO_OVERWRITTEN_CODE
start:
	mov eax, 3
l:
	dec eax
	test eax, eax
	je l


#endif


static int test(int a, int b);
static void normal(int a, int b, int c, int d, int e);
static void normal2(int a, int b, int c, int d, int e);
typedef void(*FUNCTYPE)(int a, int b, int c, int d, int e);

static void hooked(int a, int b, int c, int d, int e);
static FUNCTYPE original;

int main(int argc, char** argv)
{
	int r = 0;

	if((r = hook(normal2, 0, hooked, &original)) < 0)
	{
		printf("CAn't hook: %d\n", r);
		return 1;
	}


	printf("---\nDisass. trampoline/original\n");
	disassemble_func(original, 10);
	original(3, 1, 1, 1, 1);
	//original(5, 1, 1, 1, 1);	

#if WINDOWS
	VirtualFree(original, 0, MEM_RELEASE);
#endif
	(void)getc(stdin);
}

static int test(int a, int b)
{
	if(a == 0)
		return 5;
	else if(a == 1)
		return b;
	return a;
}

static void normal(int a, int b, int c, int d, int e)
{
	printf("Result: %d\n", a*b*c*d*e);
}

static void normal2(int a, int b, int c, int d, int e)
{
	if(a == 3)
		return;
	printf("Result: %d\n", a*b*c*d*e);
}

static void hooked(int a, int b, int c, int d, int e)
{
	original(1, b, c, d, e);
}