src/arch/x86/operand.c


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/* OpenIDA - Outil d'analyse de fichiers binaires
 * operand.c - gestion des operandes de l'architecture x86
 *
 * Copyright (C) 2008 Cyrille Bagard
 *
 *  This file is part of OpenIDA.
 *
 *  OpenIDA 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  OpenIDA 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "operand.h"


#include <malloc.h>
#include <stdio.h>


#include "../operand.h"
#include "../operand-int.h"


/* Liste des registres 8 bits */
typedef enum _X868bRegister
{
    X86_REG8_AL = 0,                        /* Registre AL                 */
    X86_REG8_CL = 1,                        /* Registre AL                 */
    X86_REG8_DL = 2,                        /* Registre AL                 */
    X86_REG8_BL = 3,                        /* Registre AL                 */
    X86_REG8_AH = 4,                        /* Registre AH                 */
    X86_REG8_CH = 5,                        /* Registre AH                 */
    X86_REG8_DH = 6,                        /* Registre AH                 */
    X86_REG8_BH = 7,                        /* Registre AH                 */

} X868bRegister;

/* Liste des registres 16 bits */
typedef enum _X8616bRegister
{
    X86_REG16_AX = 0,                       /* Registre AX                 */
    X86_REG16_CX = 1,                       /* Registre AX                 */
    X86_REG16_DX = 2,                       /* Registre AX                 */
    X86_REG16_BX = 3,                       /* Registre AX                 */
    X86_REG16_SP = 4,                       /* Registre SP                 */
    X86_REG16_BP = 5,                       /* Registre BP                 */
    X86_REG16_SI = 6,                       /* Registre SI                 */
    X86_REG16_DI = 7,                       /* Registre DI                 */

} X8616bRegister;

/* Liste des registres 32 bits */
typedef enum _X8632bRegister
{
    X86_REG32_EAX = 0,                      /* Registre EAX                */
    X86_REG32_ECX = 1,                      /* Registre EAX                */
    X86_REG32_EDX = 2,                      /* Registre EAX                */
    X86_REG32_EBX = 3,                      /* Registre EAX                */
    X86_REG32_ESP = 4,                      /* Registre ESP                */
    X86_REG32_EBP = 5,                      /* Registre EBP                */
    X86_REG32_ESI = 6,                      /* Registre ESI                */
    X86_REG32_EDI = 7,                      /* Registre EDI                */

} X8632bRegister;


/* Définition d'une opérande x86 */
struct _asm_x86_operand
{
    asm_operand base;                       /* A laisser en premier        */

    union
    {
        X868bRegister reg8;                 /* Registre 8 bits             */
        X8616bRegister reg16;               /* Registre 16 bits            */
        X8632bRegister reg32;               /* Registre 32 bits            */

    } x86_value;

};


#define NULL ((void *)0)


/******************************************************************************
*                                                                             *
*  Paramètres  : -                                                            *
*                                                                             *
*  Description : Crée une opérande vierge pour x86.                           *
*                                                                             *
*  Retour      : Opérande nouvellement créée.                                 *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

asm_x86_operand *create_new_x86_operand(void)
{
    return (asm_x86_operand *)calloc(1, sizeof(asm_x86_operand));

}


/******************************************************************************
*                                                                             *
*  Paramètres  : data     = donnée à analyser.                                *
*                is_reg32 = indique si le registre est un registre 32 bits.   *
*                base     = valeur du premier registre.                       *
*                                                                             *
*  Description : Crée une opérande renvoyant vers un registre 16 ou 32 bits.  *
*                                                                             *
*  Retour      : Opérande mise en place ou NULL.                              *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

asm_x86_operand *x86_create_reg1632_operand(uint8_t data, bool is_reg32, uint8_t base)
{
    asm_x86_operand *result;                /* Registre à retourner        */
    X8616bRegister reg16;                   /* Registre 16 bits            */
    X8632bRegister reg32;                   /* Registre 32 bits            */

    if (is_reg32)
        switch (data - base)
        {
            case 0 ... 7:
                reg32 = (X8632bRegister)(data - base);
                break;
            default:
                return NULL;
                break;
        }

    else
        switch (data - base)
        {
            case 0 ... 7:
                reg16 = (X8616bRegister)(data - base);
                break;
            default:
                return NULL;
                break;
        }

    result = create_new_x86_operand();

    ASM_OPERAND(result)->type = AOT_REG;
    ASM_OPERAND(result)->size = (is_reg32 ? AOS_32_BITS : AOS_16_BITS);

    if (is_reg32) result->x86_value.reg32 = reg32;
    else result->x86_value.reg16 = reg16;

    return result;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : data     = donnée à analyser.                                *
*                is_reg32 = indique si le registre est un registre 32 bits.   *
*                first    = indique la partie du ModR/M à traiter.            *
*                                                                             *
*  Description : Crée une opérande renvoyant vers un registre 16 ou 32 bits.  *
*                                                                             *
*  Retour      : Opérande mise en place ou NULL.                              *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

asm_x86_operand *x86_create_reg1632_operand_from_modrm(uint8_t data, bool is_reg32, bool first)
{
    asm_x86_operand *result;                /* Registre à retourner        */
    uint8_t reg;                            /* Transcription du registre   */
    X8616bRegister reg16;                   /* Registre 16 bits            */
    X8632bRegister reg32;                   /* Registre 32 bits            */

    if (first) reg = data & 0x07;
    else reg = (data & 0x38) >> 3;

    if (is_reg32)
        switch (reg)
        {
            case 0 ... 7:
                reg32 = (X8632bRegister)reg;
                break;
            default:
                return NULL;
                break;
        }

    else
        switch (reg)
        {
            case 0 ... 7:
                reg16 = (X8616bRegister)reg;
                break;
            default:
                return NULL;
                break;
        }

    result = create_new_x86_operand();

    ASM_OPERAND(result)->type = AOT_REG;
    ASM_OPERAND(result)->size = (is_reg32 ? AOS_32_BITS : AOS_16_BITS);

    if (is_reg32) result->x86_value.reg32 = reg32;
    else result->x86_value.reg16 = reg16;

    return result;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : operand = instruction à traiter.                             *
*                buffer  = tampon de sortie mis à disposition. [OUT]          *
*                len     = taille de ce tampon.                               *
*                syntax  = type de représentation demandée.                   *
*                                                                             *
*  Description : Traduit une opérande de registre en texte.                   *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

void x86_print_reg_operand(const asm_x86_operand *operand, char *buffer, size_t len, AsmSyntax syntax)
{
    switch (syntax)
    {
        case ASX_INTEL:
            switch (ASM_OPERAND(operand)->size)
            {
                case AOS_8_BITS:
                    switch (operand->x86_value.reg8)
                    {
                        case X86_REG8_AL:
                            snprintf(buffer, len, "al");
                            break;
                        case X86_REG8_CL:
                            snprintf(buffer, len, "cl");
                            break;
                        case X86_REG8_DL:
                            snprintf(buffer, len, "dl");
                            break;
                        case X86_REG8_BL:
                            snprintf(buffer, len, "bl");
                            break;
                        case X86_REG8_AH:
                            snprintf(buffer, len, "ah");
                            break;
                        case X86_REG8_CH:
                            snprintf(buffer, len, "ch");
                            break;
                        case X86_REG8_DH:
                            snprintf(buffer, len, "dh");
                            break;
                        case X86_REG8_BH:
                            snprintf(buffer, len, "bh");
                            break;
                    }
                    break;

                case AOS_16_BITS:
                    switch (operand->x86_value.reg16)
                    {
                        case X86_REG16_AX:
                            snprintf(buffer, len, "ax");
                            break;
                        case X86_REG16_CX:
                            snprintf(buffer, len, "cx");
                            break;
                        case X86_REG16_DX:
                            snprintf(buffer, len, "dx");
                            break;
                        case X86_REG16_BX:
                            snprintf(buffer, len, "bx");
                            break;
                        case X86_REG16_SP:
                            snprintf(buffer, len, "sp");
                            break;
                        case X86_REG16_BP:
                            snprintf(buffer, len, "bp");
                            break;
                        case X86_REG16_SI:
                            snprintf(buffer, len, "si");
                            break;
                        case X86_REG16_DI:
                            snprintf(buffer, len, "di");
                            break;
                    }
                    break;

                case AOS_32_BITS:
                    switch (operand->x86_value.reg32)
                    {
                        case X86_REG32_EAX:
                            snprintf(buffer, len, "eax");
                            break;
                        case X86_REG32_ECX:
                            snprintf(buffer, len, "ecx");
                            break;
                        case X86_REG32_EDX:
                            snprintf(buffer, len, "edx");
                            break;
                        case X86_REG32_EBX:
                            snprintf(buffer, len, "ebx");
                            break;
                        case X86_REG32_ESP:
                            snprintf(buffer, len, "esp");
                            break;
                        case X86_REG32_EBP:
                            snprintf(buffer, len, "ebp");
                            break;
                        case X86_REG32_ESI:
                            snprintf(buffer, len, "esi");
                            break;
                        case X86_REG32_EDI:
                            snprintf(buffer, len, "edi");
                            break;
                    }
                    break;

                case AOS_64_BITS:
                    break;

            }
            break;

        case ASX_ATT:
            switch (ASM_OPERAND(operand)->size)
            {
                case AOS_8_BITS:
                    switch (operand->x86_value.reg8)
                    {
                        case X86_REG8_AL:
                            snprintf(buffer, len, "%%al");
                            break;
                        case X86_REG8_CL:
                            snprintf(buffer, len, "%%cl");
                            break;
                        case X86_REG8_DL:
                            snprintf(buffer, len, "%%dl");
                            break;
                        case X86_REG8_BL:
                            snprintf(buffer, len, "%%bl");
                            break;
                        case X86_REG8_AH:
                            snprintf(buffer, len, "%%ah");
                            break;
                        case X86_REG8_CH:
                            snprintf(buffer, len, "%%ch");
                            break;
                        case X86_REG8_DH:
                            snprintf(buffer, len, "%%dh");
                            break;
                        case X86_REG8_BH:
                            snprintf(buffer, len, "%%bh");
                            break;
                    }
                    break;

                case AOS_16_BITS:
                    switch (operand->x86_value.reg16)
                    {
                        case X86_REG16_AX:
                            snprintf(buffer, len, "%%ax");
                            break;
                        case X86_REG16_CX:
                            snprintf(buffer, len, "%%cx");
                            break;
                        case X86_REG16_DX:
                            snprintf(buffer, len, "%%dx");
                            break;
                        case X86_REG16_BX:
                            snprintf(buffer, len, "%%bx");
                            break;
                        case X86_REG16_SP:
                            snprintf(buffer, len, "%%sp");
                            break;
                        case X86_REG16_BP:
                            snprintf(buffer, len, "%%bp");
                            break;
                        case X86_REG16_SI:
                            snprintf(buffer, len, "%%si");
                            break;
                        case X86_REG16_DI:
                            snprintf(buffer, len, "%%di");
                            break;
                    }
                    break;

                case AOS_32_BITS:
                    switch (operand->x86_value.reg32)
                    {
                        case X86_REG32_EAX:
                            snprintf(buffer, len, "%%eax");
                            break;
                        case X86_REG32_ECX:
                            snprintf(buffer, len, "%%ecx");
                            break;
                        case X86_REG32_EDX:
                            snprintf(buffer, len, "%%edx");
                            break;
                        case X86_REG32_EBX:
                            snprintf(buffer, len, "%%ebx");
                            break;
                        case X86_REG32_ESP:
                            snprintf(buffer, len, "%%esp");
                            break;
                        case X86_REG32_EBP:
                            snprintf(buffer, len, "%%ebp");
                            break;
                        case X86_REG32_ESI:
                            snprintf(buffer, len, "%%esi");
                            break;
                        case X86_REG32_EDI:
                            snprintf(buffer, len, "%%edi");
                            break;
                    }
                    break;

                case AOS_64_BITS:
                    break;

            }
            break;

    }

}