/* Chrysalide - Outil d'analyse de fichiers binaires
* thumb_16.c - désassemblage des instructions ARMv7 Thumb 16 bits
*
* Copyright (C) 2014-2017 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 Chrysalide. If not, see .
*/
#include "thumb_16.h"
#include
#include
#include "opcodes/thumb_16_opcodes.h"
#include "opcodes/opcodes_tmp_thumb_16.h"
/* Désassemble une instruction ARMv7 liées au chapitre A6.2.1 */
static GArchInstruction *process_armv7_thumb_16_shift_immediate_add_subtract_move_and_compare(uint16_t);
/* Désassemble une instruction ARMv7 liées au chapitre A6.2.2. */
static GArchInstruction *process_armv7_thumb_16_data_processing(uint16_t);
/* Désassemble une instruction ARMv7 liées au chapitre A6.2.3. */
static GArchInstruction *process_armv7_thumb_16_special_data_instructions_and_branch_and_exchange(uint16_t);
/* Désassemble une instruction ARMv7 liées au chapitre A6.2.4. */
static GArchInstruction *process_armv7_thumb_16_load_store_single_data_item(uint16_t);
/* Désassemble une instruction ARMv7 liées au chapitre A6.2.5. */
static GArchInstruction *process_armv7_thumb_16_miscellaneous_16_bit_instructions(uint16_t);
/* Désassemble une instruction ARMv7 liées au chapitre A6.2.5.b. */
static GArchInstruction *process_armv7_thumb_16_miscellaneous_16_bit_instructions_if_then_and_hints(uint16_t);
/* Désassemble une instruction ARMv7 liées au chapitre A6.2.6. */
static GArchInstruction *process_armv7_thumb_16_conditional_branch_and_supervisor_call(uint16_t);
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2. *
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
GArchInstruction *process_armv7_thumb_16_instruction_set_encoding(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opcode; /* Champ 'opcode' à retrouver */
/**
* Suit les directives de :
* § A6.2 16-bit Thumb instruction encoding
*/
result = NULL;
opcode = (raw >> 10) & b111111;
if ((opcode & b110000) == b000000)
result = process_armv7_thumb_16_shift_immediate_add_subtract_move_and_compare(raw);
else if (opcode == b010000)
result = process_armv7_thumb_16_data_processing(raw);
else if (opcode == b010001)
result = process_armv7_thumb_16_special_data_instructions_and_branch_and_exchange(raw);
else if ((opcode & b111110) == b010010)
result = armv7_read_thumb_16_instr_a8_ldr_literal(raw);
else if ((opcode & b111100) == b010100)
result = process_armv7_thumb_16_load_store_single_data_item(raw);
else if ((opcode & b111000) == b011000)
result = process_armv7_thumb_16_load_store_single_data_item(raw);
else if ((opcode & b111000) == b100000)
result = process_armv7_thumb_16_load_store_single_data_item(raw);
else if ((opcode & b111110) == b101000)
result = armv7_read_thumb_16_instr_a8_adr(raw);
else if ((opcode & b111110) == b101010)
result = armv7_read_thumb_16_instr_a8_add_sp_plus_immediate(raw);
else if ((opcode & b111100) == b101100)
result = process_armv7_thumb_16_miscellaneous_16_bit_instructions(raw);
else if ((opcode & b111110) == b110000)
result = armv7_read_thumb_16_instr_a8_stm_stmia_stmea(raw);
else if ((opcode & b111110) == b110010)
result = armv7_read_thumb_16_instr_a8_ldm_ldmia_ldmfd_thumb(raw);
else if ((opcode & b111100) == b110100)
result = process_armv7_thumb_16_conditional_branch_and_supervisor_call(raw);
else if ((opcode & b111110) == b111000)
result = armv7_read_thumb_16_instr_a8_b(raw);
return result;
}
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2.1. *
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchInstruction *process_armv7_thumb_16_shift_immediate_add_subtract_move_and_compare(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opcode; /* Champ 'opcode' à retrouver */
/**
* Suit les directives de :
* § A6.2.1 Shift (immediate), add, subtract, move, and compare
*/
if ((raw & 0xc000) != 0x0000) return NULL;
result = NULL;
opcode = (raw >> 9) & b11111;
if ((opcode & b11100) == b00000)
result = armv7_read_thumb_16_instr_a8_lsl_immediate(raw);
else if ((opcode & b11100) == b00100)
result = armv7_read_thumb_16_instr_a8_lsr_immediate(raw);
else if ((opcode & b11100) == b01000)
result = armv7_read_thumb_16_instr_a8_asr_immediate(raw);
else if (opcode == b01100)
result = armv7_read_thumb_16_instr_a8_add_register_thumb(raw);
else if (opcode == b01101)
result = armv7_read_thumb_16_instr_a8_sub_register(raw);
else if (opcode == b01110)
result = armv7_read_thumb_16_instr_a8_add_immediate_thumb(raw);
else if (opcode == b01111)
result = armv7_read_thumb_16_instr_a8_sub_immediate_thumb(raw);
else if ((opcode & b11100) == b10000)
result = armv7_read_thumb_16_instr_a8_mov_immediate(raw);
else if ((opcode & b11100) == b10100)
result = armv7_read_thumb_16_instr_a8_cmp_immediate(raw);
else if ((opcode & b11100) == b11000)
result = armv7_read_thumb_16_instr_a8_add_immediate_thumb(raw);
else if ((opcode & b11100) == b11100)
result = armv7_read_thumb_16_instr_a8_sub_immediate_thumb(raw);
return result;
}
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2.2. *
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchInstruction *process_armv7_thumb_16_data_processing(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opcode; /* Champ 'opcode' à retrouver */
/**
* Suit les directives de :
* § A6.2.2 Data-processing
*/
if ((raw & 0xfc00) != 0x4000) return NULL;
result = NULL;
opcode = (raw >> 6) & b1111;
switch (opcode)
{
case b0000:
result = armv7_read_thumb_16_instr_a8_and_register(raw);
break;
case b0001:
result = armv7_read_thumb_16_instr_a8_eor_register(raw);
break;
case b0010:
result = armv7_read_thumb_16_instr_a8_lsl_register(raw);
break;
case b0011:
result = armv7_read_thumb_16_instr_a8_lsr_register(raw);
break;
case b0100:
result = armv7_read_thumb_16_instr_a8_asr_register(raw);
break;
case b0101:
result = armv7_read_thumb_16_instr_a8_adc_register(raw);
break;
case b0110:
result = armv7_read_thumb_16_instr_a8_sbc_register(raw);
break;
case b0111:
result = armv7_read_thumb_16_instr_a8_ror_register(raw);
break;
case b1000:
result = armv7_read_thumb_16_instr_a8_tst_register(raw);
break;
case b1001:
result = armv7_read_thumb_16_instr_a8_rsb_immediate(raw);
break;
case b1010:
result = armv7_read_thumb_16_instr_a8_cmp_register(raw);
break;
case b1011:
result = armv7_read_thumb_16_instr_a8_cmn_register(raw);
break;
case b1100:
result = armv7_read_thumb_16_instr_a8_orr_register(raw);
break;
case b1101:
result = armv7_read_thumb_16_instr_a8_mul(raw);
break;
case b1110:
result = armv7_read_thumb_16_instr_a8_bic_register(raw);
break;
case b1111:
result = armv7_read_thumb_16_instr_a8_mvn_register(raw);
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2.3. *
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchInstruction *process_armv7_thumb_16_special_data_instructions_and_branch_and_exchange(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opcode; /* Champ 'opcode' à retrouver */
/**
* Suit les directives de :
* § A6.2.3 Special data instructions and branch and exchange
*/
if ((raw & 0xfc00) != 0x4400) return NULL;
result = NULL;
opcode = (raw >> 6) & b1111;
if (opcode == b0000)
result = armv7_read_thumb_16_instr_a8_add_register_thumb(raw);
else if (opcode == b0001)
result = armv7_read_thumb_16_instr_a8_add_register_thumb(raw);
else if ((opcode & b1110) == b0010)
result = armv7_read_thumb_16_instr_a8_add_register_thumb(raw);
else if ((opcode & b1100) == b0100)
result = armv7_read_thumb_16_instr_a8_cmp_register(raw);
else if (opcode == b1000)
result = armv7_read_thumb_16_instr_a8_mov_register_thumb(raw);
else if (opcode == b1001)
result = armv7_read_thumb_16_instr_a8_mov_register_thumb(raw);
else if ((opcode & b1110) == b1010)
result = armv7_read_thumb_16_instr_a8_mov_register_thumb(raw);
else if ((opcode & b1110) == b1100)
result = armv7_read_thumb_16_instr_a8_bx(raw);
else if ((opcode & b1110) == b1110)
result = armv7_read_thumb_16_instr_a8_blx_register(raw);
return result;
}
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2.4. *
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchInstruction *process_armv7_thumb_16_load_store_single_data_item(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opa; /* Champ 'opa' à retrouver */
uint16_t opb; /* Champ 'opb' à retrouver */
/**
* Suit les directives de :
* § A6.2.4 Load/store single data item
*/
result = NULL;
opa = (raw >> 12) & b1111;
opb = (raw >> 9) & b111;
switch (opa)
{
case b0101:
switch (opb)
{
case b000:
result = armv7_read_thumb_16_instr_a8_str_register(raw);
break;
case b001:
result = armv7_read_thumb_16_instr_a8_strh_register(raw);
break;
case b010:
result = armv7_read_thumb_16_instr_a8_strb_register(raw);
break;
case b011:
result = armv7_read_thumb_16_instr_a8_ldrsb_register(raw);
break;
case b100:
result = armv7_read_thumb_16_instr_a8_ldr_register_thumb(raw);
break;
case b101:
result = armv7_read_thumb_16_instr_a8_ldrh_register(raw);
break;
case b110:
result = armv7_read_thumb_16_instr_a8_ldrb_register(raw);
break;
case b111:
result = armv7_read_thumb_16_instr_a8_ldrsh_register(raw);
break;
}
break;
case b0110:
if ((opb & b100) == b000)
result = armv7_read_thumb_16_instr_a8_str_immediate_thumb(raw);
else /*if ((opb & b100) == b100)*/
result = armv7_read_thumb_16_instr_a8_ldr_immediate_thumb(raw);
break;
case b0111:
if ((opb & b100) == b000)
result = armv7_read_thumb_16_instr_a8_strb_immediate_thumb(raw);
else /*if ((opb & b100) == b100)*/
result = armv7_read_thumb_16_instr_a8_ldrb_immediate_thumb(raw);
break;
case b1000:
if ((opb & b100) == b000)
result = armv7_read_thumb_16_instr_a8_strh_immediate_thumb(raw);
else /*if ((opb & b100) == b100)*/
result = armv7_read_thumb_16_instr_a8_ldrh_immediate_thumb(raw);
break;
case b1001:
if ((opb & b100) == b000)
result = armv7_read_thumb_16_instr_a8_str_immediate_thumb(raw);
else /*if ((opb & b100) == b100)*/
result = armv7_read_thumb_16_instr_a8_ldr_immediate_thumb(raw);
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2.5. *
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchInstruction *process_armv7_thumb_16_miscellaneous_16_bit_instructions(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opcode; /* Champ 'opcode' à retrouver */
/**
* Suit les directives de :
* § A6.2.5 Miscellaneous 16-bit instructions
*/
if ((raw & 0xf000) != 0xb000) return NULL;
result = NULL;
opcode = (raw >> 5) & b1111111;
if ((opcode & b1111100) == b0000000)
result = armv7_read_thumb_16_instr_a8_add_sp_plus_immediate(raw);
else if ((opcode & b1111100) == b0000100)
result = armv7_read_thumb_16_instr_a8_sub_sp_minus_immediate(raw);
else if ((opcode & b1111000) == b0001000)
result = armv7_read_thumb_16_instr_a8_cbnz_cbz(raw);
else if ((opcode & b1111110) == b0010000)
result = armv7_read_thumb_16_instr_a8_sxth(raw);
else if ((opcode & b1111110) == b0010010)
result = armv7_read_thumb_16_instr_a8_sxtb(raw);
else if ((opcode & b1111110) == b0010100)
result = armv7_read_thumb_16_instr_a8_uxth(raw);
else if ((opcode & b1111110) == b0010110)
result = armv7_read_thumb_16_instr_a8_uxtb(raw);
else if ((opcode & b1111000) == b0011000)
result = armv7_read_thumb_16_instr_a8_cbnz_cbz(raw);
else if ((opcode & b1110000) == b0100000)
result = armv7_read_thumb_16_instr_a8_push(raw);
else if (opcode == b0110010)
result = armv7_read_thumb_16_instr_a8_setend(raw);
else if (opcode == b0110011)
result = armv7_read_thumb_16_instr_b9_cps_thumb(raw);
else if ((opcode & b1111000) == b1001000)
result = armv7_read_thumb_16_instr_a8_cbnz_cbz(raw);
else if ((opcode & b1111110) == b1010000)
result = armv7_read_thumb_16_instr_a8_rev(raw);
else if ((opcode & b1111110) == b1010010)
result = armv7_read_thumb_16_instr_a8_rev16(raw);
else if ((opcode & b1111110) == b1010110)
result = armv7_read_thumb_16_instr_a8_revsh(raw);
else if ((opcode & b1111000) == b1011000)
result = armv7_read_thumb_16_instr_a8_cbnz_cbz(raw);
else if ((opcode & b1110000) == b1100000)
result = armv7_read_thumb_16_instr_a8_pop_thumb(raw);
else if ((opcode & b1111000) == b1110000)
result = armv7_read_thumb_16_instr_a8_bkpt(raw);
else if ((opcode & b1111000) == b1111000)
result = process_armv7_thumb_16_miscellaneous_16_bit_instructions_if_then_and_hints(raw);
return result;
}
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2.5.b.*
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchInstruction *process_armv7_thumb_16_miscellaneous_16_bit_instructions_if_then_and_hints(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opa; /* Champ 'opa' à retrouver */
uint16_t opb; /* Champ 'opb' à retrouver */
/**
* Suit les directives de :
* § A6.2.5 Miscellaneous 16-bit instructions
* |-> If-Then, and hints
*/
if ((raw & 0xff00) != 0xbf00) return NULL;
result = NULL;
opa = (raw >> 4) & b1111;
opb = (raw >> 0) & b1111;
if (opb != b0000)
result = armv7_read_thumb_16_instr_a8_it(raw);
else
switch (opa)
{
case b0000:
result = armv7_read_thumb_16_instr_a8_nop(raw);
break;
case b0001:
result = armv7_read_thumb_16_instr_a8_yield(raw);
break;
case b0010:
result = armv7_read_thumb_16_instr_a8_wfe(raw);
break;
case b0011:
result = armv7_read_thumb_16_instr_a8_wfi(raw);
break;
case b0100:
result = armv7_read_thumb_16_instr_a8_sev(raw);
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : raw = donnée brute de 16 bits à désassembler. *
* *
* Description : Désassemble une instruction ARMv7 liées au chapitre A6.2.6. *
* *
* Retour : Instruction mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchInstruction *process_armv7_thumb_16_conditional_branch_and_supervisor_call(uint16_t raw)
{
GArchInstruction *result; /* Instruction à renvoyer */
uint16_t opcode; /* Champ 'opcode' à retrouver */
/**
* Suit les directives de :
* § A6.2.6 Conditional branch, and Supervisor Call
*/
if ((raw & 0xf000) != 0xd000) return NULL;
result = NULL;
opcode = (raw >> 8) & b1111;
switch (opcode)
{
case b1110:
result = armv7_read_thumb_16_instr_a8_udf(raw);
break;
case b1111:
result = armv7_read_thumb_16_instr_a8_svc_previously_swi(raw);
break;
default:
result = armv7_read_thumb_16_instr_a8_b(raw);
break;
}
return result;
}