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/* Chrysalide - Outil d'analyse de fichiers binaires
 * processor.c - gestion de l'architecture mips
 *
 * Copyright (C) 2009 Cyrille Bagard
 *
 *  This file is part of Chrysalide.
 *
 *  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 "processor.h"


#include "../processor-int.h"
#include "opcodes.h"



/* Définition du processeur de la mips (instance) */
struct _GMipsProcessor
{
    GArchProcessor parent;                  /* Instance parente            */

};


/* Définition du processeur de la mips (classe) */
struct _GMipsProcessorClass
{
    GArchProcessorClass parent;             /* Classe parente              */

};


/* Initialise la classe des lignes de descriptions initiales. */
static void g_mips_processor_class_init(GMipsProcessorClass *);

/* Initialise la classe des lignes de descriptions initiales. */
static void g_mips_processor_init(GMipsProcessor *);

/* Décode une instruction dans un flux de données. */
static GArchInstruction *g_mips_processor_decode_instruction(const GMipsProcessor *, const bin_t *, off_t *, off_t, vmpa_t);


/* Indique le type défini par la GLib pour le processeur mips. */
G_DEFINE_TYPE(GMipsProcessor, g_mips_processor, G_TYPE_ARCH_PROCESSOR);



/******************************************************************************
*                                                                             *
*  Paramètres  : klass = classe à initialiser.                                *
*                                                                             *
*  Description : Initialise la classe des lignes de descriptions initiales.   *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static void g_mips_processor_class_init(GMipsProcessorClass *klass)
{

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc = instance à initialiser.                               *
*                                                                             *
*  Description : Initialise la classe des lignes de descriptions initiales.   *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static void g_mips_processor_init(GMipsProcessor *proc)
{
    GArchProcessor *parent;                 /* Instance parente            */

    parent = G_ARCH_PROCESSOR(proc);

    parent->endianness = SRE_BIG;
    parent->memsize = MDS_32_BITS;

    parent->decode = (decode_instruction_fc)g_mips_processor_decode_instruction;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : -                                                            *
*                                                                             *
*  Description : Crée le support de l'architecture mips.                      *
*                                                                             *
*  Retour      : Architecture mise en place.                                  *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

GArchProcessor *g_mips_processor_new(void)
{
    GArchProcessor *result;                 /* Structure à retourner       */

    result = g_object_new(G_TYPE_MIPS_PROCESSOR, NULL);

    return result;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc = architecture visée par la procédure.                  *
*                data = flux de données à analyser.                           *
*                pos  = position courante dans ce flux. [OUT]                 *
*                len  = taille totale des données à analyser.                 *
*                addr = adresse virtuelle de l'instruction.                   *
*                                                                             *
*  Description : Décode une instruction dans un flux de données.              *
*                                                                             *
*  Retour      : Instruction mise en place.                                   *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static GArchInstruction *g_mips_processor_decode_instruction(const GMipsProcessor *proc, const bin_t *data, off_t *pos, off_t len, vmpa_t addr)
{
    GArchInstruction *result;               /* Instruction à renvoyer      */
    MipsOpcodes id;                         /* Identifiant d'instruction   */

    id = mips_guess_next_instruction(data, *pos, len);

    switch (id)
    {
        case MOP_NOP:
            result = mips_read_instr_nop(data, pos, len, addr, proc);
            break;


        case MOP_SRA:
            result = mips_read_instr_shift_word_right_arithmetic(data, pos, len, addr, proc);
            break;


        case MOP_JR:
            result = mips_read_instr_jump_register(data, pos, len, addr, proc);
            break;

        case MOP_JALR:
        case MOP_JALR_HB:
            result = mips_read_instr_jump_and_link_register(data, pos, len, addr, proc);
            break;



        case MOP_ADDU:
            result = mips_read_instr_add_unsigned(data, pos, len, addr, proc);
            break;

        case MOP_SUB:
            result = mips_read_instr_subtract_word(data, pos, len, addr, proc);
            break;

        case MOP_SUBU:
            result = mips_read_instr_subtract_unsigned_word(data, pos, len, addr, proc);
            break;



        case MOP_AND:
            result = mips_read_instr_and(data, pos, len, addr, proc);
            break;



        case MOP_BGEZAL:
            result = mips_read_instr_branch_on_greater_than_or_equal_to_zero_and_link(data, pos, len, addr, proc);
            break;


        case MOP_BEQ:
            result = mips_read_instr_branch_on_equal(data, pos, len, addr, proc);
            break;


        case MOP_BNE:
            result = mips_read_instr_branch_on_not_equal(data, pos, len, addr, proc);
            break;


        case MOP_ADDIU:
            result = mips_read_instr_add_immediate_unsigned(data, pos, len, addr, proc);
            break;


        case MOP_BEQL:
            result = mips_read_instr_branch_on_equal_likely(data, pos, len, addr, proc);
            break;


        case MOP_LW:
            result = mips_read_instr_load_word(data, pos, len, addr, proc);
            break;


        case MOP_LUI:
            result = mips_read_instr_load_upper_immediate(data, pos, len, addr, proc);
            break;



        case MOP_LBU:
            result = mips_read_instr_load_byte_unisgned(data, pos, len, addr, proc);
            break;


        case MOP_SB:
            result = mips_read_instr_store_byte(data, pos, len, addr, proc);
            break;

        case MOP_SW:
            result = mips_read_instr_store_word(data, pos, len, addr, proc);
            break;


        default:
            result = NULL;
            break;

    }

    return result;

}