/********************************************************************************
 *                               libemu
 *
 *                    - x86 shellcode emulation -
 *
 *
 * Copyright (C) 2007  Paul Baecher & Markus Koetter
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 * 
 *             contact nepenthesdev@users.sourceforge.net  
 *
 *******************************************************************************/


#ifndef HAVE_EMU_CPU_INSTRUCTION
#define HAVE_EMU_CPU_INSTRUCTION



#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

struct emu_cpu_instruction;
struct emu_cpu;

struct emu_cpu_instruction_info
{
	int32_t (*function)(struct emu_cpu *, struct emu_cpu_instruction *);
	const char *name;
    
	struct
	{
		uint8_t s_bit : 1;
		uint8_t w_bit : 1;
		uint8_t modrm_byte : 4;
		uint8_t imm_data : 3;
		uint8_t disp_data : 3;
		uint8_t level : 2;
		uint8_t type : 2;
		uint8_t fpu_info : 1;
	} format;
};

struct emu_cpu_instruction
{
	uint8_t opc;
	uint8_t opc_2nd;
	uint16_t prefixes;
	uint8_t s_bit : 1;
	uint8_t w_bit : 1;
	uint8_t operand_size : 2;

	struct /* mod r/m data */
	{
		union
		{
			uint8_t mod : 2;
			uint8_t x : 2;
		};

		union
		{
			uint8_t reg1 : 3;
			uint8_t opc : 3;
			uint8_t sreg3 : 3;
			uint8_t y : 3;
		};

		union
		{
			uint8_t reg : 3;
			uint8_t reg2 : 3;
			uint8_t rm : 3;
			uint8_t z : 3;
		};

		struct
		{
			uint8_t scale : 2;
			uint8_t index : 3;
			uint8_t base : 3;
		} sib;

		union
		{
			uint8_t s8;
			uint16_t s16;
			uint32_t s32;
		} disp;
		
		uint32_t ea;
	} modrm;

	uint32_t imm;
	uint16_t *imm16;
	uint8_t *imm8;

	int32_t disp;


};


#ifdef __cplusplus
}
#endif

#endif
