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+
+/* OpenIDA - Outil d'analyse de fichiers binaires
+ * op_test.c - décodage des comparaisons logiques
+ *
+ * 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 'test al, ...' (8 bits). *
+* *
+* Retour : Instruction mise en place ou NULL. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+asm_x86_instr *read_instr_test_al(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 */
+ asm_x86_operand *reg; /* Registre de destination */
+ asm_x86_operand *value; /* Valeur portée */
+
+ result = (asm_x86_instr *)calloc(1, sizeof(asm_x86_instr));
+
+ ASM_INSTRUCTION(result)->opcode = data[(*pos)++];
+
+ reg = x86_create_r8_operand(0x00, true);
+ if (reg == NULL)
+ {
+ free(result);
+ return NULL;
+ }
+
+ 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;
+
+}
+
+
+/******************************************************************************
+* *
+* 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 'test [e]ax, ...' (16/32b). *
+* *
+* Retour : Instruction mise en place ou NULL. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+asm_x86_instr *read_instr_test_e_ax(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 portée */
+
+ 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)++];
+
+ reg = x86_create_r1632_operand(0x00, oprsize == AOS_32_BITS, true);
+ if (reg == NULL)
+ {
+ free(result);
+ return NULL;
+ }
+
+ value = create_new_x86_operand();
+ if (!fill_imm_operand(ASM_OPERAND(value), oprsize, 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;
+
+}
+
+
+/******************************************************************************
+* *
+* 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 'test' (8 bits). *
+* *
+* Retour : Instruction mise en place ou NULL. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+asm_x86_instr *read_instr_test_rm8(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 */
+ off_t reg1_pos; /* POsition après lecture #1 */
+ asm_x86_operand *reg1; /* Registre de destination */
+ asm_x86_operand *reg2; /* Registre de source */
+
+ result = (asm_x86_instr *)calloc(1, sizeof(asm_x86_instr));
+
+ ASM_INSTRUCTION(result)->opcode = data[(*pos)++];
+
+ reg1_pos = *pos;
+ reg1 = x86_create_rm8_operand(data, &reg1_pos, len, true);
+ if (reg1 == NULL)
+ {
+ free(result);
+ return NULL;
+ }
+
+ reg2 = x86_create_r8_operand(data[*pos], false);
+ if (reg2 == NULL)
+ {
+ free(result);
+ free(reg1);
+ return NULL;
+ }
+
+ *pos = reg1_pos;
+
+ ASM_INSTRUCTION(result)->operands = (asm_operand **)calloc(2, sizeof(asm_operand *));
+ ASM_INSTRUCTION(result)->operands_count = 2;
+
+ ASM_INSTRUCTION(result)->operands[0] = ASM_OPERAND(reg1);
+ ASM_INSTRUCTION(result)->operands[1] = ASM_OPERAND(reg2);
+
+ return result;
+
+}
+
+
+/******************************************************************************
+* *
+* 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 'test' (16 ou 32 bits). *
+* *
+* Retour : Instruction mise en place ou NULL. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+asm_x86_instr *read_instr_test_rm1632(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 */
+ off_t reg1_pos; /* POsition après lecture #1 */
+ asm_x86_operand *reg1; /* Registre de destination */
+ asm_x86_operand *reg2; /* Registre de source */
+
+ 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)++];
+
+ reg1_pos = *pos;
+ reg1 = x86_create_rm1632_operand(data, &reg1_pos, len, oprsize == AOS_32_BITS, true);
+ if (reg1 == NULL)
+ {
+ free(result);
+ return NULL;
+ }
+
+ reg2 = x86_create_r1632_operand(data[*pos], oprsize == AOS_32_BITS, false);
+ if (reg2 == NULL)
+ {
+ free(result);
+ free(reg1);
+ return NULL;
+ }
+
+ *pos = reg1_pos;
+
+ ASM_INSTRUCTION(result)->operands = (asm_operand **)calloc(2, sizeof(asm_operand *));
+ ASM_INSTRUCTION(result)->operands_count = 2;
+
+ ASM_INSTRUCTION(result)->operands[0] = ASM_OPERAND(reg1);
+ ASM_INSTRUCTION(result)->operands[1] = ASM_OPERAND(reg2);
+
+ return result;
+
+}
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