Assembly and C

[James Parsons]

I have the following code:

#include <windows.h>
#include <stdio.h>

extern void* GetAddr(HMODULE name, LPCSTR fname)
{
	HMODULE hMod = GetModuleHandle(name);
	return void* func = GetProcAddress(hMod, fname);
}

I need to write some assembly that takes the GetAddr() function and then writes a jump to another address to it. Something like this:

mov rax, GetAddr("user32.dll", "CreateWindow")
mov THE CODE FOR A JUMP SOMEWHERE ELSE, rax

I need help finding what the hexcode for a JUMP TO SOMEWHERE ELSE IS

[tath]

search for x86/64 instruction set reference manual.

jumps are described here: http://x86.renejeschke.de/html/file_module_x86_id_147.html

[James Parsons]

That just doesn't feel right. The instruction itself is only 8-bits (EA, FF, EB, etc.)???

[tath]

this is just opcode. Parameter can be placed in memory or core register. Please refer to official intel manual for more detailed info (or the site i linked to you)