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/* Chrysalide - Outil d'analyse de fichiers binaires
* if.c - décompilation des branchements conditionnels
*
* Copyright (C) 2010-2013 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 "translate.h"
#include "../instruction.h"
#include "../../../decomp/expr/comp.h"
#include "../../../decomp/expr/cond.h"
#include "../../../decomp/expr/immediate.h"
#include "../../../decomp/instr/ite.h"
/******************************************************************************
* *
* Paramètres : instr = instruction d'origine à convertir. *
* ctx = contexte de la phase de décompilation. *
* *
* Description : Décompile une instruction de branchement conditionnel. *
* *
* Retour : Instruction mise en place ou NULL. *
* *
* Remarques : - *
* *
******************************************************************************/
GDecInstruction *dalvik_decomp_instr_if(const GArchInstruction *instr, GDecContext *ctx)
{
GDecInstruction *result; /* Instruction à retourner */
CompSignType sign; /* Type d'opération menée */
vmpa_t addr; /* Adresse de l'instruction */
GArchOperand *operand; /* Opérande de l'instruction */
GDecInstruction *op1; /* Premier opérande utilisé */
GDecInstruction *op2; /* Second opérande utilisé */
vmpa_t jmp; /* Adresse de saut */
GDecInstruction *comp; /* Comparaison à restituer */
GDecInstruction *cond; /* Transformation en condition */
switch (g_dalvik_instruction_get_opcode(G_DALVIK_INSTRUCTION(instr)))
{
case DOP_IF_EQ:
sign = CST_EQ;
break;
case DOP_IF_NE:
sign = CST_NE;
break;
case DOP_IF_LT:
sign = CST_LT;
break;
case DOP_IF_GE:
sign = CST_GE;
break;
case DOP_IF_GT:
sign = CST_GT;
break;
case DOP_IF_LE:
sign = CST_LE;
break;
default:
sign = CST_COUNT;
break;
}
g_arch_instruction_get_location(instr, NULL, NULL, &addr);
operand = g_arch_instruction_get_operand(instr, 0);
op1 = g_dec_context_convert_register(ctx, operand, false, addr);
operand = g_arch_instruction_get_operand(instr, 1);
op2 = g_dec_context_convert_register(ctx, operand, false, addr);
operand = g_arch_instruction_get_operand(instr, 2);
jmp = 0x1234ull;/*g_dec_context_convert_register(ctx, operand, addr);*/
comp = g_comp_expression_new(G_DEC_EXPRESSION(op1), sign, G_DEC_EXPRESSION(op2));
cond = g_cond_expression_new(comp);
result = g_ite_instruction_new(cond, jmp, jmp);
return result;
}
/******************************************************************************
* *
* Paramètres : instr = instruction d'origine à convertir. *
* ctx = contexte de la phase de décompilation. *
* *
* Description : Décompile une instruction de branchement conditionnel. *
* *
* Retour : Instruction mise en place ou NULL. *
* *
* Remarques : - *
* *
******************************************************************************/
GDecInstruction *dalvik_decomp_instr_if_zero(const GArchInstruction *instr, GDecContext *ctx)
{
GDecInstruction *result; /* Instruction à retourner */
CompSignType sign; /* Type d'opération menée */
vmpa_t addr; /* Adresse de l'instruction */
GArchOperand *operand; /* Opérande de l'instruction */
GDecInstruction *op1; /* Premier opérande utilisé */
GDecInstruction *op2; /* Second opérande utilisé */
vmpa_t jmp; /* Adresse de saut */
GDecInstruction *comp; /* Comparaison à restituer */
GDecInstruction *cond; /* Transformation en condition */
switch (g_dalvik_instruction_get_opcode(G_DALVIK_INSTRUCTION(instr)))
{
case DOP_IF_EQZ:
sign = CST_EQ;
break;
case DOP_IF_NEZ:
sign = CST_NE;
break;
case DOP_IF_LTZ:
sign = CST_LT;
break;
case DOP_IF_GEZ:
sign = CST_GE;
break;
case DOP_IF_GTZ:
sign = CST_GT;
break;
case DOP_IF_LEZ:
sign = CST_LE;
break;
default:
sign = CST_COUNT;
break;
}
g_arch_instruction_get_location(instr, NULL, NULL, &addr);
operand = g_arch_instruction_get_operand(instr, 0);
op1 = g_dec_context_convert_register(ctx, operand, false, addr);
operand = g_imm_operand_new_from_value(MDS_32_BITS_UNSIGNED, (unsigned int)0);
op2 = g_imm_expression_new(G_IMM_OPERAND(operand));
operand = g_arch_instruction_get_operand(instr, 2);
jmp = 0x1234ull;/*g_dec_context_convert_register(ctx, operand, addr);*/
comp = g_comp_expression_new(G_DEC_EXPRESSION(op1), sign, G_DEC_EXPRESSION(op2));
cond = g_cond_expression_new(comp);
result = g_ite_instruction_new(cond, jmp, jmp);
return result;
}
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