emu_cpu_instruction.h

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/********************************************************************************
 *                               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>


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;


};




#endif