Internal.h

/**
 *
 * WOW64Ext Library
 *
 * Copyright (c) 2012 ReWolf
 * http://blog.rewolf.pl/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#pragma once

#define EMIT(a) __asm __emit (a)

#define X64_Start_with_CS(_cs) \
	{ \
	EMIT(0x6A) EMIT(_cs)                         /*  push   _cs             */ \
	EMIT(0xE8) EMIT(0) EMIT(0) EMIT(0) EMIT(0)   /*  call   $+5             */ \
	EMIT(0x83) EMIT(4) EMIT(0x24) EMIT(5)        /*  add    dword [esp], 5  */ \
	EMIT(0xCB)                                   /*  retf                   */ \
	}

#define X64_End_with_CS(_cs) \
	{ \
	EMIT(0xE8) EMIT(0) EMIT(0) EMIT(0) EMIT(0)                                 /*  call   $+5                   */ \
	EMIT(0xC7) EMIT(0x44) EMIT(0x24) EMIT(4) EMIT(_cs) EMIT(0) EMIT(0) EMIT(0) /*  mov    dword [rsp + 4], _cs  */ \
	EMIT(0x83) EMIT(4) EMIT(0x24) EMIT(0xD)                                    /*  add    dword [rsp], 0xD      */ \
	EMIT(0xCB)                                                                 /*  retf                         */ \
	}

#define X64_Start() X64_Start_with_CS(0x33)
#define X64_End() X64_End_with_CS(0x23)

#define _RAX  0
#define _RCX  1
#define _RDX  2
#define _RBX  3
#define _RSP  4
#define _RBP  5
#define _RSI  6
#define _RDI  7
#define _R8   8
#define _R9   9
#define _R10 10
#define _R11 11
#define _R12 12
#define _R13 13
#define _R14 14
#define _R15 15

#define X64_Push(r) EMIT(0x48 | ((r) >> 3)) EMIT(0x50 | ((r) & 7))
#define X64_Pop(r) EMIT(0x48 | ((r) >> 3)) EMIT(0x58 | ((r) & 7))

// to fool M$ inline asm compiler I'm using 2 DWORDs instead of DWORD64
// use of DWORD64 will generate wrong 'pop word ptr[]' and it will break stack
union reg64
{
	unsigned long      dw[2];
	unsigned long long v;
};