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Diffstat (limited to 'plugins/arm/v7/thumb_16.c')
| -rw-r--r-- | plugins/arm/v7/thumb_16.c | 672 |
1 files changed, 672 insertions, 0 deletions
diff --git a/plugins/arm/v7/thumb_16.c b/plugins/arm/v7/thumb_16.c new file mode 100644 index 0000000..666c15e --- /dev/null +++ b/plugins/arm/v7/thumb_16.c @@ -0,0 +1,672 @@ + +/* 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 Foobar. If not, see <http://www.gnu.org/licenses/>. + */ + + +#include "thumb_16.h" + + +#include <stdint.h> + + +#include <common/bconst.h> + + +#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_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_adr(raw); + + else if ((opcode & b111110) == b101010) + result = armv7_read_thumb_16_instr_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_stm_stmia_stmea(raw); + + else if ((opcode & b111110) == b110010) + result = armv7_read_thumb_16_instr_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_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_lsl_immediate(raw); + + else if ((opcode & b11100) == b00100) + result = armv7_read_thumb_16_instr_lsr_immediate(raw); + + else if ((opcode & b11100) == b01000) + result = armv7_read_thumb_16_instr_asr_immediate(raw); + + else if (opcode == b01100) + result = armv7_read_thumb_16_instr_add_register_thumb(raw); + + else if (opcode == b01101) + result = armv7_read_thumb_16_instr_sub_register(raw); + + else if (opcode == b01110) + result = armv7_read_thumb_16_instr_add_immediate_thumb(raw); + + else if (opcode == b01111) + result = armv7_read_thumb_16_instr_sub_immediate_thumb(raw); + + else if ((opcode & b11100) == b10000) + result = armv7_read_thumb_16_instr_mov_immediate(raw); + + else if ((opcode & b11100) == b10100) + result = armv7_read_thumb_16_instr_cmp_immediate(raw); + + else if ((opcode & b11100) == b11000) + result = armv7_read_thumb_16_instr_add_immediate_thumb(raw); + + else if ((opcode & b11100) == b11100) + result = armv7_read_thumb_16_instr_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_and_register(raw); + break; + + case b0001: + result = armv7_read_thumb_16_instr_eor_register(raw); + break; + + case b0010: + result = armv7_read_thumb_16_instr_lsl_register(raw); + break; + + case b0011: + result = armv7_read_thumb_16_instr_lsr_register(raw); + break; + + case b0100: + result = armv7_read_thumb_16_instr_asr_register(raw); + break; + + case b0101: + result = armv7_read_thumb_16_instr_adc_register(raw); + break; + + case b0110: + result = armv7_read_thumb_16_instr_sbc_register(raw); + break; + + case b0111: + result = armv7_read_thumb_16_instr_ror_register(raw); + break; + + case b1000: + result = armv7_read_thumb_16_instr_tst_register(raw); + break; + + case b1001: + result = armv7_read_thumb_16_instr_rsb_immediate(raw); + break; + + case b1010: + result = armv7_read_thumb_16_instr_cmp_register(raw); + break; + + case b1011: + result = armv7_read_thumb_16_instr_cmn_register(raw); + break; + + case b1100: + result = armv7_read_thumb_16_instr_orr_register(raw); + break; + + case b1101: + result = armv7_read_thumb_16_instr_mul(raw); + break; + + case b1110: + result = armv7_read_thumb_16_instr_bic_register(raw); + break; + + case b1111: + result = armv7_read_thumb_16_instr_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_add_register_thumb(raw); + + else if (opcode == b0001) + result = armv7_read_thumb_16_instr_add_register_thumb(raw); + + else if ((opcode & b1110) == b0010) + result = armv7_read_thumb_16_instr_add_register_thumb(raw); + + else if ((opcode & b1100) == b0100) + result = armv7_read_thumb_16_instr_cmp_register(raw); + + else if (opcode == b1000) + result = armv7_read_thumb_16_instr_mov_register_thumb(raw); + + else if (opcode == b1001) + result = armv7_read_thumb_16_instr_mov_register_thumb(raw); + + else if ((opcode & b1110) == b1010) + result = armv7_read_thumb_16_instr_mov_register_thumb(raw); + + else if ((opcode & b1110) == b1100) + result = armv7_read_thumb_16_instr_bx(raw); + + else if ((opcode & b1110) == b1110) + result = armv7_read_thumb_16_instr_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_str_register(raw); + break; + + case b001: + result = armv7_read_thumb_16_instr_strh_register(raw); + break; + + case b010: + result = armv7_read_thumb_16_instr_strb_register(raw); + break; + + case b011: + result = armv7_read_thumb_16_instr_ldrsb_register(raw); + break; + + case b100: + result = armv7_read_thumb_16_instr_ldr_register_thumb(raw); + break; + + case b101: + result = armv7_read_thumb_16_instr_ldrh_register(raw); + break; + + case b110: + result = armv7_read_thumb_16_instr_ldrb_register(raw); + break; + + case b111: + result = armv7_read_thumb_16_instr_ldrsh_register(raw); + break; + + } + break; + + case b0110: + + if ((opb & b100) == b000) + result = armv7_read_thumb_16_instr_str_immediate_thumb(raw); + else /*if ((opb & b100) == b100)*/ + result = armv7_read_thumb_16_instr_ldr_immediate_thumb(raw); + + break; + + case b0111: + + if ((opb & b100) == b000) + result = armv7_read_thumb_16_instr_strb_immediate_thumb(raw); + else /*if ((opb & b100) == b100)*/ + result = armv7_read_thumb_16_instr_ldrb_immediate_thumb(raw); + + break; + + case b1000: + + if ((opb & b100) == b000) + result = armv7_read_thumb_16_instr_strh_immediate_thumb(raw); + else /*if ((opb & b100) == b100)*/ + result = armv7_read_thumb_16_instr_ldrh_immediate_thumb(raw); + + break; + + case b1001: + + if ((opb & b100) == b000) + result = armv7_read_thumb_16_instr_str_immediate_thumb(raw); + else /*if ((opb & b100) == b100)*/ + result = armv7_read_thumb_16_instr_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_add_sp_plus_immediate(raw); + + else if ((opcode & b1111100) == b0000100) + result = armv7_read_thumb_16_instr_sub_sp_minus_immediate(raw); + + else if ((opcode & b1111000) == b0001000) + result = armv7_read_thumb_16_instr_cbnz_cbz(raw); + + else if ((opcode & b1111110) == b0010000) + result = armv7_read_thumb_16_instr_sxth(raw); + + else if ((opcode & b1111110) == b0010010) + result = armv7_read_thumb_16_instr_sxtb(raw); + + else if ((opcode & b1111110) == b0010100) + result = armv7_read_thumb_16_instr_uxth(raw); + + else if ((opcode & b1111110) == b0010110) + result = armv7_read_thumb_16_instr_uxtb(raw); + + else if ((opcode & b1111000) == b0011000) + result = armv7_read_thumb_16_instr_cbnz_cbz(raw); + + else if ((opcode & b1110000) == b0100000) + result = armv7_read_thumb_16_instr_push(raw); + + else if (opcode == b0110010) + result = armv7_read_thumb_16_instr_setend(raw); + + else if (opcode == b0110011) + result = armv7_read_thumb_16_instr_cps_thumb(raw); + + else if ((opcode & b1111000) == b1001000) + result = armv7_read_thumb_16_instr_cbnz_cbz(raw); + + else if ((opcode & b1111110) == b1010000) + result = armv7_read_thumb_16_instr_rev(raw); + + else if ((opcode & b1111110) == b1010010) + result = armv7_read_thumb_16_instr_rev16(raw); + + else if ((opcode & b1111110) == b1010110) + result = armv7_read_thumb_16_instr_revsh(raw); + + else if ((opcode & b1111000) == b1011000) + result = armv7_read_thumb_16_instr_cbnz_cbz(raw); + + else if ((opcode & b1110000) == b1100000) + result = armv7_read_thumb_16_instr_pop_thumb(raw); + + else if ((opcode & b1111000) == b1110000) + result = armv7_read_thumb_16_instr_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_it(raw); + + else + switch (opa) + { + case b0000: + result = armv7_read_thumb_16_instr_nop(raw); + break; + + case b0001: + result = armv7_read_thumb_16_instr_yield(raw); + break; + + case b0010: + result = armv7_read_thumb_16_instr_wfe(raw); + break; + + case b0011: + result = armv7_read_thumb_16_instr_wfi(raw); + break; + + case b0100: + result = armv7_read_thumb_16_instr_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_udf(raw); + break; + + case b1111: + result = armv7_read_thumb_16_instr_svc_previously_swi(raw); + break; + + default: + result = armv7_read_thumb_16_instr_b(raw); + break; + + } + + return result; + +} |