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|
/* OpenIDA - Outil d'analyse de fichiers binaires
* immediate.c - opérandes représentant des valeurs numériques
*
* Copyright (C) 2009 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 "immediate.h"
#include <malloc.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "operand-int.h"
#include "../common/extstr.h"
#include "../format/format.h"
/* Définition d'un opérande de valeur numérique (instance) */
struct _GImmOperand
{
GArchOperand parent; /* Instance parente */
AsmOperandSize size; /* Taille de l'opérande */
/**
* Note : dans le cas d'une valeur signée,
* signed_imm contient la valeur lue/donnée, et
* unsigned_imm la valeur humainement lisible (ie. positive).
*/
union
{
uint8_t val8; /* Valeur sur 8 bits */
uint16_t val16; /* Valeur sur 16 bits */
uint32_t val32; /* Valeur sur 32 bits */
uint64_t val64; /* Valeur sur 64 bits */
} unsigned_imm;
union
{
int8_t val8; /* Valeur sur 8 bits */
int16_t val16; /* Valeur sur 16 bits */
int32_t val32; /* Valeur sur 32 bits */
int64_t val64; /* Valeur sur 64 bits */
} signed_imm;
};
/* Définition d'un opérande de valeur numérique (classe) */
struct _GImmOperandClass
{
GArchOperandClass parent; /* Classe parente */
};
/* Initialise la classe des lignes de descriptions initiales. */
static void g_imm_operand_class_init(GImmOperandClass *);
/* Initialise la classe des lignes de descriptions initiales. */
static void g_imm_operand_init(GImmOperand *);
/* Construit la chaîne de caractères correspondant à l'opérande. */
static size_t g_imm_operand_to_string(const GImmOperand *, AsmSyntax, char [VMPA_MAX_SIZE]);
/* Ajoute du texte simple à un fichier ouvert en écriture. */
static void g_imm_operand_add_text(const GImmOperand *, GRenderingOptions *, MainRendering, FILE *);
/* Ajoute à un tampon GLib le contenu de l'instance spécifiée. */
static void g_imm_operand_to_buffer(const GImmOperand *, GBufferLine *, GRenderingOptions *);
/* Indique le type défini pour un opérande de valeur numérique. */
G_DEFINE_TYPE(GImmOperand, g_imm_operand, G_TYPE_ARCH_OPERAND);
/******************************************************************************
* *
* Paramètres : klass = classe à initialiser. *
* *
* Description : Initialise la classe des lignes de descriptions initiales. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_imm_operand_class_init(GImmOperandClass *klass)
{
}
/******************************************************************************
* *
* Paramètres : operand = instance à initialiser. *
* *
* Description : Initialise la classe des lignes de descriptions initiales. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_imm_operand_init(GImmOperand *operand)
{
GContentExporter *parent; /* Instance parente */
parent = G_CONTENT_EXPORTER(operand);
parent->add_text = (add_text_fc)g_imm_operand_add_text;
parent->export_buffer = (export_buffer_fc)g_imm_operand_to_buffer;
}
/******************************************************************************
* *
* Paramètres : size = taille de l'opérande souhaitée. *
* data = flux de données à analyser. *
* pos = position courante dans ce flux. [OUT] *
* len = taille totale des données à analyser. *
* endian = ordre des bits dans la source. *
* *
* Description : Crée un opérande réprésentant une valeur numérique. *
* *
* Retour : Instruction mise en place. *
* *
* Remarques : - *
* *
******************************************************************************/
GArchOperand *g_imm_operand_new_from_data(MemoryDataSize size, const bin_t *data, off_t *pos, off_t len, SourceEndian endian)
{
GImmOperand *result; /* Opérande à retourner */
result = g_object_new(G_TYPE_IMM_OPERAND, NULL);
result->size = size;
switch (size)
{
case AOS_8_BITS_UNSIGNED:
if (!read_u8(&result->unsigned_imm.val8, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_16_BITS_UNSIGNED:
if (!read_u16(&result->unsigned_imm.val16, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_32_BITS_UNSIGNED:
if (!read_u32(&result->unsigned_imm.val32, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_64_BITS_UNSIGNED:
if (!read_u64(&result->unsigned_imm.val64, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_8_BITS_SIGNED:
if (!read_s8(&result->signed_imm.val8, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_16_BITS_SIGNED:
if (!read_s16(&result->signed_imm.val16, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_32_BITS_SIGNED:
if (!read_s32(&result->signed_imm.val32, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_64_BITS_SIGNED:
if (!read_s64(&result->signed_imm.val64, data, pos, len, endian))
goto gionfd_error;
break;
case MDS_UNDEFINED:
goto gionfd_error;
break;
}
return G_ARCH_OPERAND(result);
gionfd_error:
/* TODO : free */
return NULL;
}
/******************************************************************************
* *
* Paramètres : size = taille de l'opérande souhaitée. *
* ... = valeur sur x bits à venir récupérer. *
* *
* Description : Crée un opérande réprésentant une valeur numérique. *
* *
* Retour : Instruction mise en place. *
* *
* Remarques : - *
* *
******************************************************************************/
GArchOperand *g_imm_operand_new_from_value(AsmOperandSize size, ...)
{
GImmOperand *result; /* Opérande à retourner */
va_list ap; /* Liste des compléments */
uint8_t uval8; /* Valeur sur 8 bits */
uint16_t uval16; /* Valeur sur 16 bits */
uint32_t uval32; /* Valeur sur 32 bits */
uint64_t uval64; /* Valeur sur 64 bits */
int8_t sval8; /* Valeur sur 8 bits */
int16_t sval16; /* Valeur sur 16 bits */
int32_t sval32; /* Valeur sur 32 bits */
int64_t sval64; /* Valeur sur 64 bits */
if (size == AOS_UNDEFINED) return NULL;
result = g_object_new(G_TYPE_IMM_OPERAND, NULL);
result->size = size;
va_start(ap, size);
switch (size)
{
/* Pour GCC... */
case AOS_UNDEFINED:
break;
case AOS_8_BITS_UNSIGNED:
uval8 = (uint8_t)va_arg(ap, unsigned int);
result->unsigned_imm.val8 = uval8;
break;
case AOS_16_BITS_UNSIGNED:
uval16 = (uint16_t)va_arg(ap, unsigned int);
result->unsigned_imm.val16 = uval16;
break;
case AOS_32_BITS_UNSIGNED:
uval32 = (uint32_t)va_arg(ap, unsigned int);
result->unsigned_imm.val32 = uval32;
break;
case AOS_64_BITS_UNSIGNED:
uval64 = (uint64_t)va_arg(ap, unsigned int);
result->unsigned_imm.val64 = uval64;
break;
case AOS_8_BITS_SIGNED:
sval8 = (int8_t)va_arg(ap, int);
result->signed_imm.val8 = sval8;
break;
case AOS_16_BITS_SIGNED:
sval16 = (int16_t)va_arg(ap, int);
result->signed_imm.val16 = sval16;
break;
case AOS_32_BITS_SIGNED:
sval32 = (int32_t)va_arg(ap, int);
result->signed_imm.val32 = sval32;
break;
case AOS_64_BITS_SIGNED:
sval64 = (int64_t)va_arg(ap, int);
result->signed_imm.val64 = sval64;
break;
}
va_end(ap);
return G_ARCH_OPERAND(result);
}
/******************************************************************************
* *
* Paramètres : operand = structure dont le contenu est à définir. *
* *
* Description : Indique le signe d'une valeur immédiate. *
* *
* Retour : true si la valeur est strictement négative, false sinon. *
* *
* Remarques : - *
* *
******************************************************************************/
bool g_imm_operand_is_negative(const GImmOperand *operand)
{
bool result; /* Bilan à renvoyer */
switch (operand->size)
{
case AOS_8_BITS_SIGNED:
result = (operand->signed_imm.val8 & 0x80);
break;
case AOS_16_BITS_SIGNED:
result = (operand->signed_imm.val16 & 0x8000);
break;
case AOS_32_BITS_SIGNED:
result = (operand->signed_imm.val32 & 0x80000000);
break;
case AOS_64_BITS_SIGNED:
result = (operand->signed_imm.val64 & 0x8000000000000000ll);
break;
default:
result = false;
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : operand = opérande à transcrire. *
* syntax = type de représentation demandée. *
* value = valeur portée par l'opérande transcrite. [OUT] *
* *
* Description : Construit la chaîne de caractères correspondant à l'opérande.*
* *
* Retour : Nombre de caractères utilisés. *
* *
* Remarques : - *
* *
******************************************************************************/
static size_t g_imm_operand_to_string(const GImmOperand *operand, AsmSyntax syntax, char value[VMPA_MAX_SIZE])
{
size_t result; /* Longueur à retourner */
switch (syntax)
{
case ASX_INTEL:
switch (operand->size)
{
case MDS_UNDEFINED:
result = snprintf(value, VMPA_MAX_SIZE, "0x???");
break;
case AOS_8_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "0x%hhx", operand->unsigned_imm.val8);
break;
case AOS_16_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "0x%hx", operand->unsigned_imm.val16);
break;
case AOS_32_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "0x%x", operand->unsigned_imm.val32);
break;
case AOS_64_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "0x%llx", operand->unsigned_imm.val64);
break;
case AOS_8_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
result = snprintf(value, VMPA_MAX_SIZE, "0x%hhx", ~operand->signed_imm.val8 + 1);
else
result = snprintf(value, VMPA_MAX_SIZE, "0x%hhx", operand->signed_imm.val8);
break;
case AOS_16_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
result = snprintf(value, VMPA_MAX_SIZE, "0x%hx", ~operand->signed_imm.val16 + 1);
else
result = snprintf(value, VMPA_MAX_SIZE, "0x%hx", operand->signed_imm.val16);
break;
case AOS_32_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
result = snprintf(value, VMPA_MAX_SIZE, "0x%x", ~operand->signed_imm.val32 + 1);
else
result = snprintf(value, VMPA_MAX_SIZE, "0x%x", operand->signed_imm.val32);
break;
case AOS_64_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
result = snprintf(value, VMPA_MAX_SIZE, "0x%llx", ~operand->signed_imm.val64 + 1);
else
result = snprintf(value, VMPA_MAX_SIZE, "0x%llx", operand->signed_imm.val64);
break;
}
break;
case ASX_ATT:
switch (operand->size)
{
case MDS_UNDEFINED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x???");
break;
case AOS_8_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%hhx", operand->unsigned_imm.val8);
break;
case AOS_16_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%hx", operand->unsigned_imm.val16);
break;
case AOS_32_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%x", operand->unsigned_imm.val32);
break;
case AOS_64_BITS_UNSIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%llx", operand->unsigned_imm.val64);
break;
case AOS_8_BITS_SIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%hhx", ~operand->signed_imm.val8 + 1);
break;
case AOS_16_BITS_SIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%hx", ~operand->signed_imm.val16 + 1);
break;
case AOS_32_BITS_SIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%x", ~operand->signed_imm.val32 + 1);
break;
case AOS_64_BITS_SIGNED:
result = snprintf(value, VMPA_MAX_SIZE, "$0x%llx", ~operand->signed_imm.val64 + 1);
break;
}
break;
default:
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : operand = opérande à transcrire. *
* options = options de rendu. *
* rendering = support effectif final des lignes de code. *
* stream = flux ouvert en écriture. *
* *
* Description : Ajoute du texte simple à un fichier ouvert en écriture. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_imm_operand_add_text(const GImmOperand *operand, GRenderingOptions *options, MainRendering rendering, FILE *stream)
{
char value[VMPA_MAX_SIZE]; /* Chaîne à imprimer */
size_t len; /* Taille de l'élément inséré */
len = g_imm_operand_to_string(operand, g_rendering_options_get_syntax(options), value);
g_content_exporter_insert_text(G_CONTENT_EXPORTER(operand), stream, value, len, RTT_IMMEDIATE);
}
/******************************************************************************
* *
* Paramètres : operand = opérande à transcrire. *
* buffer = espace où placer ledit contenu. *
* options = options de rendu. *
* *
* Description : Ajoute à un tampon GLib le contenu de l'instance spécifiée. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_imm_operand_to_buffer(const GImmOperand *operand, GBufferLine *buffer, GRenderingOptions *options)
{
char value[VMPA_MAX_SIZE]; /* Chaîne à imprimer */
size_t len; /* Taille de l'élément inséré */
len = g_imm_operand_to_string(operand, g_rendering_options_get_syntax(options), value);
g_content_exporter_insert_into_buffer(G_CONTENT_EXPORTER(operand), buffer, BLC_ASSEMBLY,
value, len, RTT_IMMEDIATE);
}
/******************************************************************************
* *
* Paramètres : operand = opérande à traiter. *
* addr = valeur résultante. [OUT] *
* *
* Description : Convertit une valeur immédiate en adresse de type vmpa_t. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool g_imm_operand_to_vmpa_t(const GImmOperand *operand, vmpa_t *addr)
{
bool result; /* Bilan à renvoyer */
result = true;
switch (operand->size)
{
case AOS_8_BITS_UNSIGNED:
*addr = operand->unsigned_imm.val8;
break;
case AOS_16_BITS_UNSIGNED:
*addr = operand->unsigned_imm.val16;
break;
case AOS_32_BITS_UNSIGNED:
*addr = operand->unsigned_imm.val32;
break;
case AOS_64_BITS_UNSIGNED:
*addr = operand->unsigned_imm.val64;
break;
default:
result = false;
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : operand = opérande à traiter. *
* value = valeur résultante. [OUT] *
* negative = indique si la valeur était négative à l'origine. *
* *
* Description : Convertit une valeur immédiate en valeur de type size_t. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool g_imm_operand_to_size_t(const GImmOperand *operand, size_t *value, bool *negative)
{
bool result; /* Bilan à renvoyer */
*negative = g_imm_operand_is_negative(operand);
switch (operand->size)
{
case AOS_8_BITS_UNSIGNED:
result = (sizeof(size_t) >= 1);
if (result) *value = operand->unsigned_imm.val8;
break;
case AOS_16_BITS_UNSIGNED:
result = (sizeof(size_t) >= 2);
if (result) *value = operand->unsigned_imm.val16;
break;
case AOS_32_BITS_UNSIGNED:
result = (sizeof(size_t) >= 4);
if (result) *value = operand->unsigned_imm.val32;
break;
case AOS_64_BITS_UNSIGNED:
result = (sizeof(size_t) >= 8);
if (result) *value = operand->unsigned_imm.val64;
break;
case AOS_8_BITS_SIGNED:
result = (sizeof(size_t) >= 1);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val8;
break;
case AOS_16_BITS_SIGNED:
result = (sizeof(size_t) >= 2);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val16;
break;
case AOS_32_BITS_SIGNED:
result = (sizeof(size_t) >= 4);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val32;
break;
case AOS_64_BITS_SIGNED:
result = (sizeof(size_t) >= 8);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val64;
break;
default:
result = false;
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : operand = opérande à traiter. *
* value = valeur résultante. [OUT] *
* negative = indique si la valeur était négative à l'origine. *
* *
* Description : Convertit une valeur immédiate en valeur de type off_t. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
bool g_imm_operand_to_off_t(const GImmOperand *operand, off_t *value, bool *negative)
{
bool result; /* Bilan à renvoyer */
*negative = g_imm_operand_is_negative(operand);
switch (operand->size)
{
case AOS_8_BITS_UNSIGNED:
result = (sizeof(off_t) >= 1);
if (result) *value = operand->unsigned_imm.val8;
break;
case AOS_16_BITS_UNSIGNED:
result = (sizeof(off_t) >= 2);
if (result) *value = operand->unsigned_imm.val16;
break;
case AOS_32_BITS_UNSIGNED:
result = (sizeof(off_t) >= 4);
if (result) *value = operand->unsigned_imm.val32;
break;
case AOS_64_BITS_UNSIGNED:
result = (sizeof(off_t) >= 8);
if (result) *value = operand->unsigned_imm.val64;
break;
case AOS_8_BITS_SIGNED:
result = (sizeof(off_t) >= 1);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val8;
break;
case AOS_16_BITS_SIGNED:
result = (sizeof(off_t) >= 2);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val16;
break;
case AOS_32_BITS_SIGNED:
result = (sizeof(off_t) >= 4);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val32;
break;
case AOS_64_BITS_SIGNED:
result = (sizeof(off_t) >= 8);
if (result) *value = (*negative ? -1 : 1 ) * operand->signed_imm.val64;
break;
default:
result = false;
break;
}
return result;
}
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