/* This file is part of the dynarmic project. * Copyright (c) 2016 MerryMage * This software may be used and distributed according to the terms of the GNU * General Public License version 2 or any later version. */ #pragma once #include #include #include #include #include "common/common_types.h" #include "frontend/decoder/decoder_detail.h" namespace Dynarmic { namespace Arm { template struct Thumb16Matcher { using CallRetT = typename mp::MemFnInfo::return_type; Thumb16Matcher(const char* const name, u16 mask, u16 expect, std::function fn) : name(name), mask(mask), expect(expect), fn(fn) {} /// Gets the name of this type of instruction. const char* GetName() const { return name; } /** * Tests to see if the instruction is this type of instruction. * @param instruction The instruction to test * @returns true if the instruction is */ bool Matches(u16 instruction) const { return (instruction & mask) == expect; } /** * Calls the corresponding instruction handler on visitor for this type of instruction. * @param v The visitor to use * @param instruction The instruction to decode. */ CallRetT call(Visitor& v, u16 instruction) const { assert(Matches(instruction)); return fn(v, instruction); } private: const char* name; u16 mask, expect; std::function fn; }; template static const std::array, 35> g_thumb16_instruction_table {{ #define INST(fn, name, bitstring) detail::detail::GetMatcher(name, bitstring) // Shift (immediate), add, subtract, move and compare instructions { INST(&V::thumb16_LSL_imm, "LSL (imm)", "00000vvvvvmmmddd") }, { INST(&V::thumb16_LSR_imm, "LSR (imm)", "00001vvvvvmmmddd") }, { INST(&V::thumb16_ASR_imm, "ASR (imm)", "00010vvvvvmmmddd") }, { INST(&V::thumb16_ADD_reg_t1, "ADD (reg, T1)", "0001100mmmnnnddd") }, { INST(&V::thumb16_SUB_reg, "SUB (reg)", "0001101mmmnnnddd") }, { INST(&V::thumb16_ADD_imm_t1, "ADD (imm, T1)", "0001110vvvnnnddd") }, { INST(&V::thumb16_SUB_imm_t1, "SUB (imm, T1)", "0001111vvvnnnddd") }, { INST(&V::thumb16_MOV_imm, "MOV (imm)", "00100dddvvvvvvvv") }, { INST(&V::thumb16_CMP_imm, "CMP (imm)", "00101nnnvvvvvvvv") }, { INST(&V::thumb16_ADD_imm_t2, "ADD (imm, T2)", "00110dddvvvvvvvv") }, { INST(&V::thumb16_SUB_imm_t2, "SUB (imm, T2)", "00111dddvvvvvvvv") }, // Data-processing instructions { INST(&V::thumb16_AND_reg, "AND (reg)", "0100000000mmmddd") }, { INST(&V::thumb16_EOR_reg, "EOR (reg)", "0100000001mmmddd") }, { INST(&V::thumb16_LSL_reg, "LSL (reg)", "0100000010mmmddd") }, { INST(&V::thumb16_LSR_reg, "LSR (reg)", "0100000011mmmddd") }, { INST(&V::thumb16_ASR_reg, "ASR (reg)", "0100000100mmmddd") }, { INST(&V::thumb16_ADC_reg, "ADC (reg)", "0100000101mmmddd") }, { INST(&V::thumb16_SBC_reg, "SBC (reg)", "0100000110mmmddd") }, { INST(&V::thumb16_ROR_reg, "ROR (reg)", "0100000111sssddd") }, { INST(&V::thumb16_TST_reg, "TST (reg)", "0100001000mmmnnn") }, { INST(&V::thumb16_RSB_imm, "RSB (imm)", "0100001001nnnddd") }, { INST(&V::thumb16_CMP_reg_t1, "CMP (reg, T1)", "0100001010mmmnnn") }, { INST(&V::thumb16_CMN_reg, "CMN (reg)", "0100001011mmmnnn") }, { INST(&V::thumb16_ORR_reg, "ORR (reg)", "0100001100mmmddd") }, //{ INST(&V::thumb16_MULS_rr, "MULS (rr)", "0100001101mmmddd") }, { INST(&V::thumb16_BIC_reg, "BIC (reg)", "0100001110mmmddd") }, { INST(&V::thumb16_MVN_reg, "MVN (reg)", "0100001111mmmddd") }, // Special data instructions { INST(&V::thumb16_ADD_reg_t2, "ADD (reg, T2)", "01000100Dmmmmddd") }, // v4T, Low regs: v6T2 { INST(&V::thumb16_CMP_reg_t2, "CMP (reg, T2)", "01000101Nmmmmnnn") }, // v4T { INST(&V::thumb16_MOV_reg, "MOV (reg)", "01000110Dmmmmddd") }, // v4T, Low regs: v6 // Store/Load single data item instructions { INST(&V::thumb16_LDR_literal, "LDR (literal)", "01001tttvvvvvvvv") }, { INST(&V::thumb16_STR_reg, "STR (reg)", "0101000mmmnnnttt") }, { INST(&V::thumb16_STRH_reg, "STRH (reg)", "0101001mmmnnnttt") }, { INST(&V::thumb16_STRB_reg, "STRB (reg)", "0101010mmmnnnttt") }, //{ INST(&V::thumb16_LDRSB_rrr, "LDRSB (rrr)", "0101011mmmnnnddd") }, //{ INST(&V::thumb16_LDR_rrr, "LDR (rrr)", "0101100mmmnnnddd") }, //{ INST(&V::thumb16_LDRH_rrr, "LDRH (rrr)", "0101101mmmnnnddd") }, //{ INST(&V::thumb16_LDRB_rrr, "LDRB (rrr)", "0101110mmmnnnddd") }, //{ INST(&V::thumb16_LDRSH_rrr, "LDRSH (rrr)", "0101111mmmnnnddd") }, { INST(&V::thumb16_LDR_imm_t1, "LDR (imm, T1)", "01101vvvvvnnnttt") }, //{ INST(&V::thumb16_STRH_rri, "STRH (rri)", "10000vvvvvnnnddd") }, //{ INST(&V::thumb16_LDRH_rri, "LDRH (rri)", "10001vvvvvnnnddd") }, //{ INST(&V::thumb16_STR_sp, "STR (SP)", "10010dddvvvvvvvv") }, //{ INST(&V::thumb16_LDR_sp, "LDR (SP)", "10011dddvvvvvvvv") }, // Generate relative address instruction //{ INST(&V::thumb16_ADR, "ADR", "10100dddvvvvvvvv") }, //{ INST(&V::thumb16_ADD_sp, "ADD (relative to SP)", "10101dddvvvvvvvv") }, // Miscellaneous 16-bit instructions //{ INST(&V::thumb16_ADD_spsp, "ADD (imm to SP)", "101100000vvvvvvv") }, // v4T //{ INST(&V::thumb16_SUB_spsp, "SUB (imm from SP)", "101100001vvvvvvv") }, // v4T //{ INST(&V::thumb16_SXTH, "SXTH", "1011001000mmmddd") }, // v6 //{ INST(&V::thumb16_SXTB, "SXTB", "1011001001mmmddd") }, // v6 //{ INST(&V::thumb16_UXTH, "UXTH", "1011001010mmmddd") }, // v6 //{ INST(&V::thumb16_UXTB, "UXTB", "1011001011mmmddd") }, // v6 //{ INST(&V::thumb16_PUSH, "PUSH", "1011010rxxxxxxxx") }, // v4T //{ INST(&V::thumb16_POP, "POP", "1011110rxxxxxxxx") }, // v4T //{ INST(&V::thumb16_SETEND, "SETEND", "101101100101x000") }, // v6 //{ INST(&V::thumb16_CPS, "CPS", "10110110011m0aif") }, // v6 //{ INST(&V::thumb16_REV, "REV", "1011101000nnnddd") }, // v6 //{ INST(&V::thumb16_REV16, "REV16", "1011101001nnnddd") }, // v6 //{ INST(&V::thumb16_REVSH, "REVSH", "1011101011nnnddd") }, // v6 //{ INST(&V::thumb16_BKPT, "BKPT", "10111110xxxxxxxx") }, // v5 // Store/Load multiple registers //{ INST(&V::thumb16_STMIA, "STMIA", "11000nnnxxxxxxxx") }, //{ INST(&V::thumb16_LDMIA, "LDMIA", "11001nnnxxxxxxxx") }, // Branch instructions //{ INST(&V::thumb16_BX, "BX (reg)", "010001110mmmm000") }, // v4T //{ INST(&V::thumb16_BLX, "BLX (reg)", "010001111mmmm000") }, // v5T { INST(&V::thumb16_UDF, "UDF", "11011110--------") }, //{ INST(&V::thumb16_SWI, "SWI", "11011111xxxxxxxx") }, //{ INST(&V::thumb16_B_cond, "B (cond)", "1101ccccxxxxxxxx") }, //{ INST(&V::thumb16_B_imm, "B (imm)", "11100xxxxxxxxxxx") }, //{ INST(&V::thumb16_BLX_suffix, "BLX (imm, suffix)", "11101xxxxxxxxxx0") }, //{ INST(&V::thumb16_BLX_prefix, "BL/BLX (imm, prefix)", "11110xxxxxxxxxxx") }, //{ INST(&V::thumb16_BL_suffix, "BL (imm, suffix)", "11111xxxxxxxxxxx") }, #undef INST }}; template boost::optional&> DecodeThumb16(u16 instruction) { const auto& table = g_thumb16_instruction_table; auto matches_instruction = [instruction](const auto& matcher){ return matcher.Matches(instruction); }; assert(std::count_if(table.begin(), table.end(), matches_instruction) <= 1); auto iter = std::find_if(table.begin(), table.end(), matches_instruction); return iter != table.end() ? boost::make_optional&>(*iter) : boost::none; } } // namespace Arm } // namespace Dynarmic