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/* Chrysalide - Outil d'analyse de fichiers binaires
* post.c - traitements complémentaires à la phase de désassemblage
*
* Copyright (C) 2016-2017 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 "post.h"
#include <assert.h>
#include "processor.h"
#include "target.h"
#include "../analysis/routine.h"
/******************************************************************************
* *
* Paramètres : instr = instruction ARMv7 à traiter. *
* proc = représentation de l'architecture utilisée. *
* context = contexte associé à la phase de désassemblage. *
* format = accès aux données du binaire d'origine. *
* index = indice de l'opérande précisant le saut. *
* type = type du nouveau simple à mettre en place. *
* *
* Description : Associe un symbole à la valeur ciblée par un opérande. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
void post_process_target_resolution(GArchInstruction *instr, GArchProcessor *proc, GProcContext *context, GExeFormat *format, size_t index, SymbolType type)
{
GArchOperand *op; /* Opérande numérique en place */
virt_t addr; /* Adresse visée par le saut */
GBinFormat *bfmt; /* Version basique du format */
MemoryDataSize ptr_size; /* Taille de l'espace mémoire */
GTargetOperand *new; /* Instruction de ciblage */
vmpa2t target; /* Emplacement de la cible */
mrange_t trange; /* Etendue du symbole à créer */
VMPA_BUFFER(loc); /* Conversion en chaîne */
char name[5 + VMPA_MAX_LEN]; /* Etiquette de la destination */
GBinRoutine *routine; /* Nouvelle routine trouvée */
GBinSymbol *symbol; /* Nouveau symbole construit */
g_arch_instruction_lock_operands(instr);
op = _g_arch_instruction_get_operand(instr, index);
assert(G_IS_IMM_OPERAND(op));
if (g_imm_operand_to_virt_t(G_IMM_OPERAND(op), &addr)
&& g_exe_format_translate_address_into_vmpa(format, addr, &target))
{
bfmt = G_BIN_FORMAT(format);
ptr_size = g_arch_processor_get_memory_size(proc);
new = G_TARGET_OPERAND(g_target_operand_new(ptr_size, &target));
if (!g_target_operand_resolve(&new, bfmt, true, NULL))
{
init_mrange(&trange, &target, 0);
vmpa2_to_string(&target, MDS_UNDEFINED, loc, NULL);
switch (type)
{
case STP_ROUTINE:
snprintf(name, sizeof(name), "sub_%s", loc + 2);
routine = g_binary_routine_new();
symbol = G_BIN_SYMBOL(routine);
g_binary_symbol_set_range(symbol, &trange);
g_binary_routine_set_name(routine, strdup(name));
break;
case STP_CODE_LABEL:
snprintf(name, sizeof(name), "loc_%s", loc + 2);
symbol = g_binary_symbol_new(&trange, type);
g_binary_symbol_set_alt_label(symbol, name);
break;
default:
assert(false);
break;
}
g_binary_format_add_symbol(bfmt, symbol);
g_target_operand_resolve(&new, bfmt, true, NULL);
}
_g_arch_instruction_replace_operand(instr, op, G_ARCH_OPERAND(new));
}
g_arch_instruction_unlock_operands(instr);
}
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