/* OpenIDA - Outil d'analyse de fichiers binaires
 * op_int.c - décodage des instructions d'interruption
 *
 * 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 <malloc.h>


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



/******************************************************************************
*                                                                             *
*  Paramètres  : data = flux de données à analyser.                           *
*                pos  = position courante dans ce flux. [OUT]                 *
*                len  = taille totale des données à analyser.                 *
*                                                                             *
*  Description : Décode une instruction de type 'int'.                        *
*                                                                             *
*  Retour      : Instruction mise en place ou NULL.                           *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

asm_x86_instr *read_instr_int(const uint8_t *data, off_t *pos, off_t len)
{
    asm_x86_instr *result;                  /* Instruction à retourner     */
    asm_x86_operand *syscall;               /* Indice de l'appel système   */

    result = (asm_x86_instr *)calloc(1, sizeof(asm_x86_instr));

    ASM_INSTRUCTION(result)->opcode = data[(*pos)++];

    syscall = create_new_x86_operand();
    if (!fill_imm_operand(ASM_OPERAND(syscall), AOS_8_BITS, data, pos, len))
    {
        free(syscall);
        free(result);
        return NULL;
    }

    ASM_INSTRUCTION(result)->operands = (asm_operand **)calloc(1, sizeof(asm_operand *));
    ASM_INSTRUCTION(result)->operands_count = 1;

    ASM_INSTRUCTION(result)->operands[0] = ASM_OPERAND(syscall);

    return result;

}