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/* Chrysalide - Outil d'analyse de fichiers binaires
 * processor.c - manipulation du processeur de la VM Dalvik
 *
 * Copyright (C) 2010-2012 Cyrille Bagard
 *
 *  This file is part of Chrysalide.
 *
 *  Chrysalide 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.
 *
 *  Chrysalide 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 <assert.h>


#include "context.h"
#include "instruction.h"
#include "opcodes/opcodes.h"
#include "pseudo/fill.h"
#include "pseudo/switch.h"
#include "../processor-int.h"
#include "../../format/dex/dex.h"



/* Définition du processeur de la VM Dalvik (instance) */
struct _GDalvikProcessor
{
    GArchProcessor parent;                  /* Instance parente            */

};


/* Définition du processeur de la VM Dalvik (classe) */
struct _GDalvikProcessorClass
{
    GArchProcessorClass parent;             /* Classe parente              */

};


/* Initialise la classe des processeurs de VM Dalvik. */
static void g_dalvik_processor_class_init(GDalvikProcessorClass *);

/* Initialise une instance de processeur de VM Dalvik. */
static void g_dalvik_processor_init(GDalvikProcessor *);

/* Supprime toutes les références externes. */
static void g_dalvik_processor_dispose(GDalvikProcessor *);

/* Procède à la libération totale de la mémoire. */
static void g_dalvik_processor_finalize(GDalvikProcessor *);

/* Fournit un contexte pour l'exécution du processeur Dalvik. */
static GDalvikContext *g_dalvik_processor_get_context(const GDalvikProcessor *);

/* Fournit un contexte pour la décompilation Dalvik. */
static GDalvikDContext *g_dalvik_processor_get_decomp_context(const GDalvikProcessor *);

/* Décode une instruction dans un flux de données. */
static GArchInstruction *g_dalvik_processor_disassemble(const GArchProcessor *, GDalvikContext *, const GBinContent *, vmpa2t *, GExeFormat *);

/* Décode une pseudo-instruction dans un flux de données. */
static GArchInstruction *g_dalvik_processor_disassemble_pseudo(const GArchProcessor *, GDalvikContext *, const GBinContent *, vmpa2t *, uint8_t);



/* Indique le type défini par la GLib pour le processeur DALVIK. */
G_DEFINE_TYPE(GDalvikProcessor, g_dalvik_processor, G_TYPE_ARCH_PROCESSOR);



/******************************************************************************
*                                                                             *
*  Paramètres  : klass = classe à initialiser.                                *
*                                                                             *
*  Description : Initialise la classe des processeurs de VM Dalvik.           *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static void g_dalvik_processor_class_init(GDalvikProcessorClass *klass)
{
    GObjectClass *object;                   /* Autre version de la classe  */
    GArchProcessorClass *proc;              /* Encore une autre vision...  */

    object = G_OBJECT_CLASS(klass);

    object->dispose = (GObjectFinalizeFunc/* ! */)g_dalvik_processor_dispose;
    object->finalize = (GObjectFinalizeFunc)g_dalvik_processor_finalize;

    proc = G_ARCH_PROCESSOR_CLASS(klass);

    proc->disassemble = (disass_instr_fc)g_dalvik_processor_disassemble;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc = instance à initialiser.                               *
*                                                                             *
*  Description : Initialise une instance de processeur de VM Dalvik.          *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static void g_dalvik_processor_init(GDalvikProcessor *proc)
{
    GArchProcessor *parent;                 /* Instance parente            */

    parent = G_ARCH_PROCESSOR(proc);

    parent->endianness = SRE_LITTLE;
    parent->memsize = MDS_32_BITS;
    parent->inssize = MDS_16_BITS;

    parent->get_ctx = (get_processor_context_fc)g_dalvik_processor_get_context;
    parent->get_dec_ctx = (get_decomp_context_fc)g_dalvik_processor_get_decomp_context;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc = instance d'objet GLib à traiter.                      *
*                                                                             *
*  Description : Supprime toutes les références externes.                     *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static void g_dalvik_processor_dispose(GDalvikProcessor *proc)
{
    G_OBJECT_CLASS(g_dalvik_processor_parent_class)->dispose(G_OBJECT(proc));

}


/******************************************************************************
*                                                                             *
*  Paramètres  : bookmark = instance d'objet GLib à traiter.                  *
*                                                                             *
*  Description : Procède à la libération totale de la mémoire.                *
*                                                                             *
*  Retour      : -                                                            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static void g_dalvik_processor_finalize(GDalvikProcessor *proc)
{
    G_OBJECT_CLASS(g_dalvik_processor_parent_class)->finalize(G_OBJECT(proc));

}


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

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

    result = g_object_new(G_TYPE_DALVIK_PROCESSOR, NULL);

    return result;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc = architecture, spectatrice ici.                        *
*                                                                             *
*  Description : Fournit un contexte pour l'exécution du processeur Dalvik.   *
*                                                                             *
*  Retour      : Contexte mis en place.                                       *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static GDalvikContext *g_dalvik_processor_get_context(const GDalvikProcessor *proc)
{
    return g_dalvik_context_new();

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc = architecture, spectatrice ici.                        *
*                                                                             *
*  Description : Fournit un contexte pour la décompilation Dalvik.            *
*                                                                             *
*  Retour      : Contexte mis en place.                                       *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static GDalvikDContext *g_dalvik_processor_get_decomp_context(const GDalvikProcessor *proc)
{
    return g_dalvik_dcontext_new();

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc    = architecture visée par la procédure.               *
*                ctx     = contexte lié à l'exécution du processeur.          *
*                content = flux de données à analyser.                        *
*                pos     = position courante dans ce flux. [OUT]              *
*                format  = format du fichier contenant le code.               *
*                                                                             *
*  Description : Désassemble une instruction dans un flux de données.         *
*                                                                             *
*  Retour      : Instruction mise en place ou NULL en cas d'échec.            *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static GArchInstruction *g_dalvik_processor_disassemble(const GArchProcessor *proc, GDalvikContext *ctx, const GBinContent *content, vmpa2t *pos, GExeFormat *format)
{
    GArchInstruction *result;               /* Instruction à renvoyer      */
    uint8_t raw8;                           /* Donnée de 8 bits à analyser */
    DalvikOpcodes id;                       /* Identifiant d'instruction   */

    static const disass_instr_fc decodings[DOP_COUNT] = {

        [DOP_NOP]                   = dalvik_read_instr_nop,
        [DOP_MOVE]                  = dalvik_read_instr_move,
        [DOP_MOVE_FROM_16]          = dalvik_read_instr_move_from16,
        [DOP_MOVE_16]               = dalvik_read_instr_move_16,
        [DOP_MOVE_WIDE]             = dalvik_read_instr_move_wide,
        [DOP_MOVE_WIDE_FROM_16]     = dalvik_read_instr_move_wide_from16,
        [DOP_MOVE_WIDE_16]          = dalvik_read_instr_move_wide_16,
        [DOP_MOVE_OBJECT]           = dalvik_read_instr_move_object,
        [DOP_MOVE_OBJECT_FROM_16]   = dalvik_read_instr_move_object_from16,
        [DOP_MOVE_OBJECT_16]        = dalvik_read_instr_move_object_16,
        [DOP_MOVE_RESULT]           = dalvik_read_instr_move_result,
        [DOP_MOVE_RESULT_WIDE]      = dalvik_read_instr_move_result_wide,
        [DOP_MOVE_RESULT_OBJECT]    = dalvik_read_instr_move_result_object,
        [DOP_MOVE_EXCEPTION]        = dalvik_read_instr_move_exception,
        [DOP_RETURN_VOID]           = dalvik_read_instr_return_void,
        [DOP_RETURN]                = dalvik_read_instr_return,
        [DOP_RETURN_WIDE]           = dalvik_read_instr_return_wide,
        [DOP_RETURN_OBJECT]         = dalvik_read_instr_return_object,
        [DOP_CONST_4]               = dalvik_read_instr_const_4,
        [DOP_CONST_16]              = dalvik_read_instr_const_16,
        [DOP_CONST]                 = dalvik_read_instr_const,
        [DOP_CONST_HIGH16]          = dalvik_read_instr_const_high16,
        [DOP_CONST_WIDE_16]         = dalvik_read_instr_const_wide_16,
        [DOP_CONST_WIDE_32]         = dalvik_read_instr_const_wide_32,
        [DOP_CONST_WIDE]            = dalvik_read_instr_const_wide,
        [DOP_CONST_WIDE_HIGH16]     = dalvik_read_instr_const_wide_high16,
        [DOP_CONST_STRING]          = dalvik_read_instr_const_string,
        [DOP_CONST_STRING_JUMBO]    = dalvik_read_instr_const_string_jumbo,
        [DOP_CONST_CLASS]           = dalvik_read_instr_const_class,
        [DOP_MONITOR_ENTER]         = dalvik_read_instr_monitor_enter,
        [DOP_MONITOR_EXIT]          = dalvik_read_instr_monitor_exit,
        [DOP_CHECK_CAST]            = dalvik_read_instr_check_cast,
        [DOP_INSTANCE_OF]           = dalvik_read_instr_instance_of,
        [DOP_ARRAY_LENGTH]          = dalvik_read_instr_array_length,
        [DOP_NEW_INSTANCE]          = dalvik_read_instr_new_instance,
        [DOP_NEW_ARRAY]             = dalvik_read_instr_new_array,
        [DOP_FILLED_NEW_ARRAY]      = dalvik_read_instr_filled_new_array,
        [DOP_FILLED_NEW_ARRAY_RANGE]= dalvik_read_instr_filled_new_array_range,
        [DOP_FILL_ARRAY_DATA]       = dalvik_read_instr_fill_array_data,
        [DOP_THROW]                 = dalvik_read_instr_throw,
        [DOP_GOTO]                  = dalvik_read_instr_goto,
        [DOP_GOTO_16]               = dalvik_read_instr_goto_16,
        [DOP_GOTO_32]               = dalvik_read_instr_goto_32,
        [DOP_PACKED_SWITCH]         = dalvik_read_instr_packed_switch,
        [DOP_SPARSE_SWITCH]         = dalvik_read_instr_sparse_switch,
        [DOP_CMPL_FLOAT]            = dalvik_read_instr_cmpl_float,
        [DOP_CMPG_FLOAT]            = dalvik_read_instr_cmpg_float,
        [DOP_CMPL_DOUBLE]           = dalvik_read_instr_cmpl_double,
        [DOP_CMPG_DOUBLE]           = dalvik_read_instr_cmpg_double,
        [DOP_CMP_LONG]              = dalvik_read_instr_cmp_long,
        [DOP_IF_EQ]                 = dalvik_read_instr_if_eq,
        [DOP_IF_NE]                 = dalvik_read_instr_if_ne,
        [DOP_IF_LT]                 = dalvik_read_instr_if_lt,
        [DOP_IF_GE]                 = dalvik_read_instr_if_ge,
        [DOP_IF_GT]                 = dalvik_read_instr_if_gt,
        [DOP_IF_LE]                 = dalvik_read_instr_if_le,
        [DOP_IF_EQZ]                = dalvik_read_instr_if_eqz,
        [DOP_IF_NEZ]                = dalvik_read_instr_if_nez,
        [DOP_IF_LTZ]                = dalvik_read_instr_if_ltz,
        [DOP_IF_GEZ]                = dalvik_read_instr_if_gez,
        [DOP_IF_GTZ]                = dalvik_read_instr_if_gtz,
        [DOP_IF_LEZ]                = dalvik_read_instr_if_lez,
        [DOP_AGET]                  = dalvik_read_instr_aget,
        [DOP_AGET_WIDE]             = dalvik_read_instr_aget_wide,
        [DOP_AGET_OBJECT]           = dalvik_read_instr_aget_object,
        [DOP_AGET_BOOLEAN]          = dalvik_read_instr_aget_boolean,
        [DOP_AGET_BYTE]             = dalvik_read_instr_aget_byte,
        [DOP_AGET_CHAR]             = dalvik_read_instr_aget_char,
        [DOP_AGET_SHORT]            = dalvik_read_instr_aget_short,
        [DOP_APUT]                  = dalvik_read_instr_aput,
        [DOP_APUT_WIDE]             = dalvik_read_instr_aput_wide,
        [DOP_APUT_OBJECT]           = dalvik_read_instr_aput_object,
        [DOP_APUT_BOOLEAN]          = dalvik_read_instr_aput_boolean,
        [DOP_APUT_BYTE]             = dalvik_read_instr_aput_byte,
        [DOP_APUT_CHAR]             = dalvik_read_instr_aput_char,
        [DOP_APUT_SHORT]            = dalvik_read_instr_aput_short,
        [DOP_IGET]                  = dalvik_read_instr_iget,
        [DOP_IGET_WIDE]             = dalvik_read_instr_iget_wide,
        [DOP_IGET_OBJECT]           = dalvik_read_instr_iget_object,
        [DOP_IGET_BOOLEAN]          = dalvik_read_instr_iget_boolean,
        [DOP_IGET_BYTE]             = dalvik_read_instr_iget_byte,
        [DOP_IGET_CHAR]             = dalvik_read_instr_iget_char,
        [DOP_IGET_SHORT]            = dalvik_read_instr_iget_short,
        [DOP_IPUT]                  = dalvik_read_instr_iput,
        [DOP_IPUT_WIDE]             = dalvik_read_instr_iput_wide,
        [DOP_IPUT_OBJECT]           = dalvik_read_instr_iput_object,
        [DOP_IPUT_BOOLEAN]          = dalvik_read_instr_iput_boolean,
        [DOP_IPUT_BYTE]             = dalvik_read_instr_iput_byte,
        [DOP_IPUT_CHAR]             = dalvik_read_instr_iput_char,
        [DOP_IPUT_SHORT]            = dalvik_read_instr_iput_short,
        [DOP_SGET]                  = dalvik_read_instr_sget,
        [DOP_SGET_WIDE]             = dalvik_read_instr_sget_wide,
        [DOP_SGET_OBJECT]           = dalvik_read_instr_sget_object,
        [DOP_SGET_BOOLEAN]          = dalvik_read_instr_sget_boolean,
        [DOP_SGET_BYTE]             = dalvik_read_instr_sget_byte,
        [DOP_SGET_CHAR]             = dalvik_read_instr_sget_char,
        [DOP_SGET_SHORT]            = dalvik_read_instr_sget_short,
        [DOP_SPUT]                  = dalvik_read_instr_sput,
        [DOP_SPUT_WIDE]             = dalvik_read_instr_sput_wide,
        [DOP_SPUT_OBJECT]           = dalvik_read_instr_sput_object,
        [DOP_SPUT_BOOLEAN]          = dalvik_read_instr_sput_boolean,
        [DOP_SPUT_BYTE]             = dalvik_read_instr_sput_byte,
        [DOP_SPUT_CHAR]             = dalvik_read_instr_sput_char,
        [DOP_SPUT_SHORT]            = dalvik_read_instr_sput_short,
        [DOP_INVOKE_VIRTUAL]        = dalvik_read_instr_invoke_virtual,
        [DOP_INVOKE_SUPER]          = dalvik_read_instr_invoke_super,
        [DOP_INVOKE_DIRECT]         = dalvik_read_instr_invoke_direct,
        [DOP_INVOKE_STATIC]         = dalvik_read_instr_invoke_static,
        [DOP_INVOKE_INTERFACE]      = dalvik_read_instr_invoke_interface,
        [DOP_INVOKE_VIRTUAL_RANGE]  = dalvik_read_instr_invoke_virtual_range,
        [DOP_INVOKE_SUPER_RANGE]    = dalvik_read_instr_invoke_super_range,
        [DOP_INVOKE_DIRECT_RANGE]   = dalvik_read_instr_invoke_direct_range,
        [DOP_INVOKE_STATIC_RANGE]   = dalvik_read_instr_invoke_static_range,
        [DOP_INVOKE_INTERFACE_RANGE]= dalvik_read_instr_invoke_interface_range,
        [DOP_NEG_INT]               = dalvik_read_instr_neg_int,
        [DOP_NOT_INT]               = dalvik_read_instr_not_int,
        [DOP_NEG_LONG]              = dalvik_read_instr_neg_long,
        [DOP_NOT_LONG]              = dalvik_read_instr_not_long,
        [DOP_NEG_FLOAT]             = dalvik_read_instr_neg_float,
        [DOP_NEG_DOUBLE]            = dalvik_read_instr_neg_double,
        [DOP_TO_INT_LONG]           = dalvik_read_instr_int_to_long,
        [DOP_TO_INT_FLOAT]          = dalvik_read_instr_int_to_float,
        [DOP_TO_INT_DOUBLE]         = dalvik_read_instr_int_to_double,
        [DOP_TO_LONG_INT]           = dalvik_read_instr_long_to_int,
        [DOP_TO_LONG_FLOAT]         = dalvik_read_instr_long_to_float,
        [DOP_TO_LONG_DOUBLE]        = dalvik_read_instr_long_to_double,
        [DOP_TO_FLOAT_INT]          = dalvik_read_instr_float_to_int,
        [DOP_TO_FLOAT_LONG]         = dalvik_read_instr_float_to_long,
        [DOP_TO_FLOAT_DOUBLE]       = dalvik_read_instr_float_to_double,
        [DOP_TO_DOUBLE_INT]         = dalvik_read_instr_double_to_int,
        [DOP_TO_DOUBLE_LONG]        = dalvik_read_instr_double_to_long,
        [DOP_TO_DOUBLE_FLOAT]       = dalvik_read_instr_double_to_float,
        [DOP_TO_INT_BYTE]           = dalvik_read_instr_int_to_byte,
        [DOP_TO_INT_CHAR]           = dalvik_read_instr_int_to_char,
        [DOP_TO_INT_SHORT]          = dalvik_read_instr_int_to_short,
        [DOP_ADD_INT]               = dalvik_read_instr_add_int,
        [DOP_SUB_INT]               = dalvik_read_instr_sub_int,
        [DOP_MUL_INT]               = dalvik_read_instr_mul_int,
        [DOP_DIV_INT]               = dalvik_read_instr_div_int,
        [DOP_REM_INT]               = dalvik_read_instr_rem_int,
        [DOP_AND_INT]               = dalvik_read_instr_and_int,
        [DOP_OR_INT]                = dalvik_read_instr_or_int,
        [DOP_XOR_INT]               = dalvik_read_instr_xor_int,
        [DOP_SHL_INT]               = dalvik_read_instr_shl_int,
        [DOP_SHR_INT]               = dalvik_read_instr_shr_int,
        [DOP_USHR_INT]              = dalvik_read_instr_ushr_int,
        [DOP_ADD_LONG]              = dalvik_read_instr_add_long,
        [DOP_SUB_LONG]              = dalvik_read_instr_sub_long,
        [DOP_MUL_LONG]              = dalvik_read_instr_mul_long,
        [DOP_DIV_LONG]              = dalvik_read_instr_div_long,
        [DOP_REM_LONG]              = dalvik_read_instr_rem_long,
        [DOP_AND_LONG]              = dalvik_read_instr_and_long,
        [DOP_OR_LONG]               = dalvik_read_instr_or_long,
        [DOP_XOR_LONG]              = dalvik_read_instr_xor_long,
        [DOP_SHL_LONG]              = dalvik_read_instr_shl_long,
        [DOP_SHR_LONG]              = dalvik_read_instr_shr_long,
        [DOP_USHR_LONG]             = dalvik_read_instr_ushr_long,
        [DOP_ADD_FLOAT]             = dalvik_read_instr_add_float,
        [DOP_SUB_FLOAT]             = dalvik_read_instr_sub_float,
        [DOP_MUL_FLOAT]             = dalvik_read_instr_mul_float,
        [DOP_DIV_FLOAT]             = dalvik_read_instr_div_float,
        [DOP_REM_FLOAT]             = dalvik_read_instr_rem_float,
        [DOP_ADD_DOUBLE]            = dalvik_read_instr_add_double,
        [DOP_SUB_DOUBLE]            = dalvik_read_instr_sub_double,
        [DOP_MUL_DOUBLE]            = dalvik_read_instr_mul_double,
        [DOP_DIV_DOUBLE]            = dalvik_read_instr_div_double,
        [DOP_REM_DOUBLE]            = dalvik_read_instr_rem_double,
        [DOP_ADD_INT_2ADDR]         = dalvik_read_instr_add_int_2addr,
        [DOP_SUB_INT_2ADDR]         = dalvik_read_instr_sub_int_2addr,
        [DOP_MUL_INT_2ADDR]         = dalvik_read_instr_mul_int_2addr,
        [DOP_DIV_INT_2ADDR]         = dalvik_read_instr_div_int_2addr,
        [DOP_REM_INT_2ADDR]         = dalvik_read_instr_rem_int_2addr,
        [DOP_AND_INT_2ADDR]         = dalvik_read_instr_and_int_2addr,
        [DOP_OR_INT_2ADDR]          = dalvik_read_instr_or_int_2addr,
        [DOP_XOR_INT_2ADDR]         = dalvik_read_instr_xor_int_2addr,
        [DOP_SHL_INT_2ADDR]         = dalvik_read_instr_shl_int_2addr,
        [DOP_SHR_INT_2ADDR]         = dalvik_read_instr_shr_int_2addr,
        [DOP_USHR_INT_2ADDR]        = dalvik_read_instr_ushr_int_2addr,
        [DOP_ADD_LONG_2ADDR]        = dalvik_read_instr_add_long_2addr,
        [DOP_SUB_LONG_2ADDR]        = dalvik_read_instr_sub_long_2addr,
        [DOP_MUL_LONG_2ADDR]        = dalvik_read_instr_mul_long_2addr,
        [DOP_DIV_LONG_2ADDR]        = dalvik_read_instr_div_long_2addr,
        [DOP_REM_LONG_2ADDR]        = dalvik_read_instr_rem_long_2addr,
        [DOP_AND_LONG_2ADDR]        = dalvik_read_instr_and_long_2addr,
        [DOP_OR_LONG_2ADDR]         = dalvik_read_instr_or_long_2addr,
        [DOP_XOR_LONG_2ADDR]        = dalvik_read_instr_xor_long_2addr,
        [DOP_SHL_LONG_2ADDR]        = dalvik_read_instr_shl_long_2addr,
        [DOP_SHR_LONG_2ADDR]        = dalvik_read_instr_shr_long_2addr,
        [DOP_USHR_LONG_2ADDR]       = dalvik_read_instr_ushr_long_2addr,
        [DOP_ADD_FLOAT_2ADDR]       = dalvik_read_instr_add_float_2addr,
        [DOP_SUB_FLOAT_2ADDR]       = dalvik_read_instr_sub_float_2addr,
        [DOP_MUL_FLOAT_2ADDR]       = dalvik_read_instr_mul_float_2addr,
        [DOP_DIV_FLOAT_2ADDR]       = dalvik_read_instr_div_float_2addr,
        [DOP_REM_FLOAT_2ADDR]       = dalvik_read_instr_rem_float_2addr,
        [DOP_ADD_DOUBLE_2ADDR]      = dalvik_read_instr_add_double_2addr,
        [DOP_SUB_DOUBLE_2ADDR]      = dalvik_read_instr_sub_double_2addr,
        [DOP_MUL_DOUBLE_2ADDR]      = dalvik_read_instr_mul_double_2addr,
        [DOP_DIV_DOUBLE_2ADDR]      = dalvik_read_instr_div_double_2addr,
        [DOP_REM_DOUBLE_2ADDR]      = dalvik_read_instr_rem_double_2addr,
        [DOP_ADD_INT_LIT16]         = dalvik_read_instr_add_int_lit16,
        [DOP_RSUB_INT]              = dalvik_read_instr_rsub_int,
        [DOP_MUL_INT_LIT16]         = dalvik_read_instr_mul_int_lit16,
        [DOP_DIV_INT_LIT16]         = dalvik_read_instr_div_int_lit16,
        [DOP_REM_INT_LIT16]         = dalvik_read_instr_rem_int_lit16,
        [DOP_AND_INT_LIT16]         = dalvik_read_instr_and_int_lit16,
        [DOP_OR_INT_LIT16]          = dalvik_read_instr_or_int_lit16,
        [DOP_XOR_INT_LIT16]         = dalvik_read_instr_xor_int_lit16,
        [DOP_ADD_INT_LIT8]          = dalvik_read_instr_add_int_lit8,
        [DOP_RSUB_INT_LIT8]         = dalvik_read_instr_rsub_int_lit8,
        [DOP_MUL_INT_LIT8]          = dalvik_read_instr_mul_int_lit8,
        [DOP_DIV_INT_LIT8]          = dalvik_read_instr_div_int_lit8,
        [DOP_REM_INT_LIT8]          = dalvik_read_instr_rem_int_lit8,
        [DOP_AND_INT_LIT8]          = dalvik_read_instr_and_int_lit8,
        [DOP_OR_INT_LIT8]           = dalvik_read_instr_or_int_lit8,
        [DOP_XOR_INT_LIT8]          = dalvik_read_instr_xor_int_lit8,
        [DOP_SHL_INT_LIT8]          = dalvik_read_instr_shl_int_lit8,
        [DOP_SHR_INT_LIT8]          = dalvik_read_instr_shr_int_lit8,
        [DOP_USHR_INT_LIT8]         = dalvik_read_instr_ushr_int_lit8

    };

    /* Données brutes associées à une instruction ? */

    result = g_dalvik_context_get_raw_data(ctx, content, pos);

    if (result != NULL) goto gdpd_done;

    /* Pseudo-instruction... */

    if (!g_binary_content_read_u8(content, pos, &raw8))
        return NULL;

    result = g_dalvik_processor_disassemble_pseudo(proc, ctx, content, pos, raw8);

    if (result != NULL) goto gdpd_done;

    /* ... ou instruction classique */

    assert(raw8 < DOP_COUNT);

    id = (DalvikOpcodes)raw8;

    if (decodings[id] != NULL)
        result = decodings[id](proc, G_PROC_CONTEXT(ctx), content, pos, format);

 gdpd_done:

    return result;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : proc = architecture visée par la procédure.                  *
*                data = flux de données à analyser.                           *
*                pos  = position courante dans ce flux. [OUT]                 *
*                end  = limite des données à analyser.                        *
*                addr = adresse virtuelle de l'instruction.                   *
*                low8 = 8 bits de poids faible déjà lus.                      *
*                                                                             *
*  Description : Décode une pseudo-instruction dans un flux de données.       *
*                                                                             *
*  Retour      : Instruction mise en place ou NULL si aucune trouvée.         *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static GArchInstruction *g_dalvik_processor_disassemble_pseudo(const GArchProcessor *proc, GDalvikContext *ctx, const GBinContent *content, vmpa2t *pos, uint8_t low8)
{
    GArchInstruction *result;               /* Instruction à renvoyer      */
    vmpa2t tmp;                             /* Position modifiable         */
    uint8_t high8;                          /* Nouvelle octet à venir lire */
    uint16_t ident;                         /* Valeur lue dans le code     */

    /* Vérification astucieuse et rapide...*/
    if (low8 != 0x00 /* DOP_NOP */)
        return NULL;

    result = NULL;

    copy_vmpa(&tmp, pos);

    if (!g_binary_content_read_u8(content, pos, &high8))
        goto gdpdp_exit;

    ident = high8 << 8 | low8;

    switch (ident)
    {
        case DPO_PACKED_SWITCH:
        case DPO_SPARSE_SWITCH:
            result = g_dalvik_switch_instr_new(ident, ctx, content, pos);
            break;

        case DPO_FILL_ARRAY_DATA:
            result = g_dalvik_fill_instr_new(ident, ctx, content, pos);
            break;

        default:
            result = NULL;
            break;

    }

 gdpdp_exit:

    if (result == NULL)
        copy_vmpa(pos, &tmp);

    return result;

}