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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 "operand-int.h"
#include "../common/extstr.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 *);
/* Traduit un opérande en version humainement lisible. */
static char *g_imm_operand_get_text(const GImmOperand *, const exe_format *, AsmSyntax);
/* 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)
{
GArchOperand *parent; /* Instance parente */
parent = G_ARCH_OPERAND(operand);
parent->get_text = (get_operand_text_fc)g_imm_operand_get_text;
}
/******************************************************************************
* *
* 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_8_BITS_SIGNED:
if (!read_u8(&result->signed_imm.val8, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_16_BITS_SIGNED:
if (!read_u16(&result->signed_imm.val16, data, pos, len, endian))
goto gionfd_error;
break;
case AOS_32_BITS_SIGNED:
if (!read_u32(&result->signed_imm.val32, data, pos, len, endian))
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 */
result = false;
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:
/* Traitement non nécessaire */
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : operand = opérande à traiter. *
* format = format du binaire manipulé. *
* syntax = type de représentation demandée. *
* *
* Description : Traduit un opérande en version humainement lisible. *
* *
* Retour : Chaîne de caractères à libérer de la mémoire. *
* *
* Remarques : - *
* *
******************************************************************************/
static char *g_imm_operand_get_text(const GImmOperand *operand, const exe_format *format, AsmSyntax syntax)
{
char *result; /* Chaîne à retourner */
char *label; /* Etiquette de symbole */
SymbolType symtype; /* Type de symbole */
vmpa_t offset; /* Décallage final constaté */
char buffer[256]; /* Complément d'information */
/* Valeur brute */
result = (char *)calloc(19, sizeof(char));
switch (syntax)
{
case ASX_INTEL:
switch (operand->size)
{
case MDS_UNDEFINED:
snprintf(result, 19, "$0x???");
break;
case AOS_8_BITS_UNSIGNED:
snprintf(result, 19, "0x%hhx", operand->unsigned_imm.val8);
break;
case AOS_16_BITS_UNSIGNED:
snprintf(result, 19, "0x%hx", operand->unsigned_imm.val16);
break;
case AOS_32_BITS_UNSIGNED:
snprintf(result, 19, "0x%x", operand->unsigned_imm.val32);
break;
case AOS_64_BITS_UNSIGNED:
snprintf(result, 19, "0x%llx", operand->unsigned_imm.val64);
break;
case AOS_8_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
snprintf(result, 19, "0x%hhx", ~operand->signed_imm.val8 + 1);
else
snprintf(result, 19, "0x%hhx", operand->signed_imm.val8);
break;
case AOS_16_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
snprintf(result, 19, "0x%hx", ~operand->signed_imm.val16 + 1);
else
snprintf(result, 19, "0x%hx", operand->signed_imm.val16);
break;
case AOS_32_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
snprintf(result, 19, "0x%x", ~operand->signed_imm.val32 + 1);
else
snprintf(result, 19, "0x%x", operand->signed_imm.val32);
break;
case AOS_64_BITS_SIGNED:
if (g_imm_operand_is_negative(operand))
snprintf(result, 19, "0x%llx", ~operand->signed_imm.val64 + 1);
else
snprintf(result, 19, "0x%llx", operand->signed_imm.val64);
break;
}
break;
case ASX_ATT:
switch (operand->size)
{
case MDS_UNDEFINED:
snprintf(result, 19, "$0x???");
break;
case AOS_8_BITS_UNSIGNED:
snprintf(result, 19, "$0x%hhx", operand->unsigned_imm.val8);
break;
case AOS_16_BITS_UNSIGNED:
snprintf(result, 19, "$0x%hx", operand->unsigned_imm.val16);
break;
case AOS_32_BITS_UNSIGNED:
snprintf(result, 19, "$0x%x", operand->unsigned_imm.val32);
break;
case AOS_64_BITS_UNSIGNED:
snprintf(result, 19, "$0x%llx", operand->unsigned_imm.val64);
break;
case AOS_8_BITS_SIGNED:
snprintf(result, 19, "$0x%hhx", ~operand->signed_imm.val8 + 1);
break;
case AOS_16_BITS_SIGNED:
snprintf(result, 19, "$0x%hx", ~operand->signed_imm.val16 + 1);
break;
case AOS_32_BITS_SIGNED:
snprintf(result, 19, "$0x%x", ~operand->signed_imm.val32 + 1);
break;
case AOS_64_BITS_SIGNED:
snprintf(result, 19, "$0x%llx", ~operand->signed_imm.val64 + 1);
break;
}
break;
}
/* Complément d'information */
if (operand->size == AOS_32_BITS_SIGNED || operand->size == AOS_32_BITS_UNSIGNED) /* FIXME */
{
offset = operand->unsigned_imm.val32; /* FIXME !!! */
if (resolve_exe_symbol(format, &label, &symtype, &offset))
{
switch (symtype)
{
case STP_SECTION:
if (offset == 0) snprintf(buffer, 256, " <%s>", label);
else snprintf(buffer, 256, " <%s+0x%llx>", label, offset);
result = stradd(result, buffer);
break;
case STP_STRING:
label = escape_crlf(label);
label = strrpl(label, "<", "<");
label = strrpl(label, ">", ">");
snprintf(buffer, 256, " \"%s\"", label);
result = stradd(result, buffer);
break;
}
free(label);
}
}
return result;
}
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