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/* OpenIDA - Outil d'analyse de fichiers binaires
* op_sbb.c - décodage des soustractions avec retenue
*
* Copyright (C) 2008 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 <malloc.h>
#include "../instruction-int.h"
#include "opcodes.h"
#include "operand.h"
/******************************************************************************
* *
* Paramètres : data = flux de données à analyser. *
* pos = position courante dans ce flux. [OUT] *
* len = taille totale des données à analyser. *
* offset = adresse virtuelle de l'instruction. *
* proc = architecture ciblée par le désassemblage. *
* *
* Description : Décode une instruction de type 'sbb' (16 ou 32 bits). *
* *
* Retour : Instruction mise en place ou NULL. *
* *
* Remarques : - *
* *
******************************************************************************/
asm_x86_instr *read_instr_sbb8_with_reg1632(const uint8_t *data, off_t *pos, off_t len, uint64_t offset, const asm_x86_processor *proc)
{
asm_x86_instr *result; /* Instruction à retourner */
AsmOperandSize oprsize; /* Taille des opérandes */
asm_x86_operand *reg; /* Registre de destination */
asm_x86_operand *value; /* Valeur empilée */
result = (asm_x86_instr *)calloc(1, sizeof(asm_x86_instr));
/* Utilisation des registres 32 bits ? */
if (data[*pos] == 0x66)
{
oprsize = switch_x86_operand_size(proc);
(*pos)++;
}
else oprsize = get_x86_current_operand_size(proc);
ASM_INSTRUCTION(result)->opcode = data[(*pos)++];
/* TODO ! */
if ((data[*pos] & 0xc0) != 0xc0)
return NULL;
reg = x86_create_reg1632_operand_from_modrm(data[*pos], oprsize == AOS_32_BITS, false);
if (reg == NULL)
{
free(result);
return NULL;
}
(*pos)++;
value = create_new_x86_operand();
if (!fill_imm_operand(ASM_OPERAND(value), AOS_8_BITS, data, pos, len))
{
free(reg);
free(value);
free(result);
return NULL;
}
ASM_INSTRUCTION(result)->operands = (asm_operand **)calloc(2, sizeof(asm_operand *));
ASM_INSTRUCTION(result)->operands_count = 2;
ASM_INSTRUCTION(result)->operands[0] = ASM_OPERAND(reg);
ASM_INSTRUCTION(result)->operands[1] = ASM_OPERAND(value);
return result;
}
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