// Copyright 2011 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include <assert.h> #include <stdarg.h> #include <stdio.h> #if V8_TARGET_ARCH_X64 #include "src/base/compiler-specific.h" #include "src/base/lazy-instance.h" #include "src/base/v8-fallthrough.h" #include "src/disasm.h" #include "src/x64/register-x64.h" #include "src/x64/sse-instr.h" namespace disasm { enum OperandType { UNSET_OP_ORDER = 0, // Operand size decides between 16, 32 and 64 bit operands. REG_OPER_OP_ORDER = 1, // Register destination, operand source. OPER_REG_OP_ORDER = 2, // Operand destination, register source. // Fixed 8-bit operands. BYTE_SIZE_OPERAND_FLAG = 4, BYTE_REG_OPER_OP_ORDER = REG_OPER_OP_ORDER | BYTE_SIZE_OPERAND_FLAG, BYTE_OPER_REG_OP_ORDER = OPER_REG_OP_ORDER | BYTE_SIZE_OPERAND_FLAG }; //------------------------------------------------------------------ // Tables //------------------------------------------------------------------ struct ByteMnemonic { int b; // -1 terminates, otherwise must be in range (0..255) OperandType op_order_; const char* mnem; }; static const ByteMnemonic two_operands_instr[] = { { 0x00, BYTE_OPER_REG_OP_ORDER, "add" }, { 0x01, OPER_REG_OP_ORDER, "add" }, { 0x02, BYTE_REG_OPER_OP_ORDER, "add" }, { 0x03, REG_OPER_OP_ORDER, "add" }, { 0x08, BYTE_OPER_REG_OP_ORDER, "or" }, { 0x09, OPER_REG_OP_ORDER, "or" }, { 0x0A, BYTE_REG_OPER_OP_ORDER, "or" }, { 0x0B, REG_OPER_OP_ORDER, "or" }, { 0x10, BYTE_OPER_REG_OP_ORDER, "adc" }, { 0x11, OPER_REG_OP_ORDER, "adc" }, { 0x12, BYTE_REG_OPER_OP_ORDER, "adc" }, { 0x13, REG_OPER_OP_ORDER, "adc" }, { 0x18, BYTE_OPER_REG_OP_ORDER, "sbb" }, { 0x19, OPER_REG_OP_ORDER, "sbb" }, { 0x1A, BYTE_REG_OPER_OP_ORDER, "sbb" }, { 0x1B, REG_OPER_OP_ORDER, "sbb" }, { 0x20, BYTE_OPER_REG_OP_ORDER, "and" }, { 0x21, OPER_REG_OP_ORDER, "and" }, { 0x22, BYTE_REG_OPER_OP_ORDER, "and" }, { 0x23, REG_OPER_OP_ORDER, "and" }, { 0x28, BYTE_OPER_REG_OP_ORDER, "sub" }, { 0x29, OPER_REG_OP_ORDER, "sub" }, { 0x2A, BYTE_REG_OPER_OP_ORDER, "sub" }, { 0x2B, REG_OPER_OP_ORDER, "sub" }, { 0x30, BYTE_OPER_REG_OP_ORDER, "xor" }, { 0x31, OPER_REG_OP_ORDER, "xor" }, { 0x32, BYTE_REG_OPER_OP_ORDER, "xor" }, { 0x33, REG_OPER_OP_ORDER, "xor" }, { 0x38, BYTE_OPER_REG_OP_ORDER, "cmp" }, { 0x39, OPER_REG_OP_ORDER, "cmp" }, { 0x3A, BYTE_REG_OPER_OP_ORDER, "cmp" }, { 0x3B, REG_OPER_OP_ORDER, "cmp" }, { 0x63, REG_OPER_OP_ORDER, "movsxl" }, { 0x84, BYTE_REG_OPER_OP_ORDER, "test" }, { 0x85, REG_OPER_OP_ORDER, "test" }, { 0x86, BYTE_REG_OPER_OP_ORDER, "xchg" }, { 0x87, REG_OPER_OP_ORDER, "xchg" }, { 0x88, BYTE_OPER_REG_OP_ORDER, "mov" }, { 0x89, OPER_REG_OP_ORDER, "mov" }, { 0x8A, BYTE_REG_OPER_OP_ORDER, "mov" }, { 0x8B, REG_OPER_OP_ORDER, "mov" }, { 0x8D, REG_OPER_OP_ORDER, "lea" }, { -1, UNSET_OP_ORDER, "" } }; static const ByteMnemonic zero_operands_instr[] = { { 0xC3, UNSET_OP_ORDER, "ret" }, { 0xC9, UNSET_OP_ORDER, "leave" }, { 0xF4, UNSET_OP_ORDER, "hlt" }, { 0xFC, UNSET_OP_ORDER, "cld" }, { 0xCC, UNSET_OP_ORDER, "int3" }, { 0x60, UNSET_OP_ORDER, "pushad" }, { 0x61, UNSET_OP_ORDER, "popad" }, { 0x9C, UNSET_OP_ORDER, "pushfd" }, { 0x9D, UNSET_OP_ORDER, "popfd" }, { 0x9E, UNSET_OP_ORDER, "sahf" }, { 0x99, UNSET_OP_ORDER, "cdq" }, { 0x9B, UNSET_OP_ORDER, "fwait" }, { 0xA4, UNSET_OP_ORDER, "movs" }, { 0xA5, UNSET_OP_ORDER, "movs" }, { 0xA6, UNSET_OP_ORDER, "cmps" }, { 0xA7, UNSET_OP_ORDER, "cmps" }, { -1, UNSET_OP_ORDER, "" } }; static const ByteMnemonic call_jump_instr[] = { { 0xE8, UNSET_OP_ORDER, "call" }, { 0xE9, UNSET_OP_ORDER, "jmp" }, { -1, UNSET_OP_ORDER, "" } }; static const ByteMnemonic short_immediate_instr[] = { { 0x05, UNSET_OP_ORDER, "add" }, { 0x0D, UNSET_OP_ORDER, "or" }, { 0x15, UNSET_OP_ORDER, "adc" }, { 0x1D, UNSET_OP_ORDER, "sbb" }, { 0x25, UNSET_OP_ORDER, "and" }, { 0x2D, UNSET_OP_ORDER, "sub" }, { 0x35, UNSET_OP_ORDER, "xor" }, { 0x3D, UNSET_OP_ORDER, "cmp" }, { -1, UNSET_OP_ORDER, "" } }; static const char* const conditional_code_suffix[] = { "o", "no", "c", "nc", "z", "nz", "na", "a", "s", "ns", "pe", "po", "l", "ge", "le", "g" }; enum InstructionType { NO_INSTR, ZERO_OPERANDS_INSTR, TWO_OPERANDS_INSTR, JUMP_CONDITIONAL_SHORT_INSTR, REGISTER_INSTR, PUSHPOP_INSTR, // Has implicit 64-bit operand size. MOVE_REG_INSTR, CALL_JUMP_INSTR, SHORT_IMMEDIATE_INSTR }; enum Prefixes { ESCAPE_PREFIX = 0x0F, OPERAND_SIZE_OVERRIDE_PREFIX = 0x66, ADDRESS_SIZE_OVERRIDE_PREFIX = 0x67, VEX3_PREFIX = 0xC4, VEX2_PREFIX = 0xC5, LOCK_PREFIX = 0xF0, REPNE_PREFIX = 0xF2, REP_PREFIX = 0xF3, REPEQ_PREFIX = REP_PREFIX }; struct InstructionDesc { const char* mnem; InstructionType type; OperandType op_order_; bool byte_size_operation; // Fixed 8-bit operation. }; class InstructionTable { public: InstructionTable(); const InstructionDesc& Get(byte x) const { return instructions_[x]; } private: InstructionDesc instructions_[256]; void Clear(); void Init(); void CopyTable(const ByteMnemonic bm[], InstructionType type); void SetTableRange(InstructionType type, byte start, byte end, bool byte_size, const char* mnem); void AddJumpConditionalShort(); }; InstructionTable::InstructionTable() { Clear(); Init(); } void InstructionTable::Clear() { for (int i = 0; i < 256; i++) { instructions_[i].mnem = "(bad)"; instructions_[i].type = NO_INSTR; instructions_[i].op_order_ = UNSET_OP_ORDER; instructions_[i].byte_size_operation = false; } } void InstructionTable::Init() { CopyTable(two_operands_instr, TWO_OPERANDS_INSTR); CopyTable(zero_operands_instr, ZERO_OPERANDS_INSTR); CopyTable(call_jump_instr, CALL_JUMP_INSTR); CopyTable(short_immediate_instr, SHORT_IMMEDIATE_INSTR); AddJumpConditionalShort(); SetTableRange(PUSHPOP_INSTR, 0x50, 0x57, false, "push"); SetTableRange(PUSHPOP_INSTR, 0x58, 0x5F, false, "pop"); SetTableRange(MOVE_REG_INSTR, 0xB8, 0xBF, false, "mov"); } void InstructionTable::CopyTable(const ByteMnemonic bm[], InstructionType type) { for (int i = 0; bm[i].b >= 0; i++) { InstructionDesc* id = &instructions_[bm[i].b]; id->mnem = bm[i].mnem; OperandType op_order = bm[i].op_order_; id->op_order_ = static_cast<OperandType>(op_order & ~BYTE_SIZE_OPERAND_FLAG); DCHECK_EQ(NO_INSTR, id->type); // Information not already entered id->type = type; id->byte_size_operation = ((op_order & BYTE_SIZE_OPERAND_FLAG) != 0); } } void InstructionTable::SetTableRange(InstructionType type, byte start, byte end, bool byte_size, const char* mnem) { for (byte b = start; b <= end; b++) { InstructionDesc* id = &instructions_[b]; DCHECK_EQ(NO_INSTR, id->type); // Information not already entered id->mnem = mnem; id->type = type; id->byte_size_operation = byte_size; } } void InstructionTable::AddJumpConditionalShort() { for (byte b = 0x70; b <= 0x7F; b++) { InstructionDesc* id = &instructions_[b]; DCHECK_EQ(NO_INSTR, id->type); // Information not already entered id->mnem = nullptr; // Computed depending on condition code. id->type = JUMP_CONDITIONAL_SHORT_INSTR; } } namespace { DEFINE_LAZY_LEAKY_OBJECT_GETTER(InstructionTable, GetInstructionTable); } static const InstructionDesc cmov_instructions[16] = { {"cmovo", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovno", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovc", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovnc", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovz", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovnz", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovna", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmova", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovs", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovns", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovpe", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovpo", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovl", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovge", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovle", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}, {"cmovg", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false} }; //------------------------------------------------------------------------------ // DisassemblerX64 implementation. // A new DisassemblerX64 object is created to disassemble each instruction. // The object can only disassemble a single instruction. class DisassemblerX64 { public: DisassemblerX64(const NameConverter& converter, Disassembler::UnimplementedOpcodeAction unimplemented_action) : converter_(converter), tmp_buffer_pos_(0), abort_on_unimplemented_(unimplemented_action == Disassembler::kAbortOnUnimplementedOpcode), rex_(0), operand_size_(0), group_1_prefix_(0), vex_byte0_(0), vex_byte1_(0), vex_byte2_(0), byte_size_operand_(false), instruction_table_(GetInstructionTable()) { tmp_buffer_[0] = '\0'; } // Writes one disassembled instruction into 'buffer' (0-terminated). // Returns the length of the disassembled machine instruction in bytes. int InstructionDecode(v8::internal::Vector<char> buffer, byte* instruction); private: enum OperandSize { OPERAND_BYTE_SIZE = 0, OPERAND_WORD_SIZE = 1, OPERAND_DOUBLEWORD_SIZE = 2, OPERAND_QUADWORD_SIZE = 3 }; const NameConverter& converter_; v8::internal::EmbeddedVector<char, 128> tmp_buffer_; unsigned int tmp_buffer_pos_; bool abort_on_unimplemented_; // Prefixes parsed byte rex_; byte operand_size_; // 0x66 or (if no group 3 prefix is present) 0x0. byte group_1_prefix_; // 0xF2, 0xF3, or (if no group 1 prefix is present) 0. byte vex_byte0_; // 0xC4 or 0xC5 byte vex_byte1_; byte vex_byte2_; // only for 3 bytes vex prefix // Byte size operand override. bool byte_size_operand_; const InstructionTable* const instruction_table_; void setRex(byte rex) { DCHECK_EQ(0x40, rex & 0xF0); rex_ = rex; } bool rex() { return rex_ != 0; } bool rex_b() { return (rex_ & 0x01) != 0; } // Actual number of base register given the low bits and the rex.b state. int base_reg(int low_bits) { return low_bits | ((rex_ & 0x01) << 3); } bool rex_x() { return (rex_ & 0x02) != 0; } bool rex_r() { return (rex_ & 0x04) != 0; } bool rex_w() { return (rex_ & 0x08) != 0; } bool vex_w() { DCHECK(vex_byte0_ == VEX3_PREFIX || vex_byte0_ == VEX2_PREFIX); return vex_byte0_ == VEX3_PREFIX ? (vex_byte2_ & 0x80) != 0 : false; } bool vex_128() { DCHECK(vex_byte0_ == VEX3_PREFIX || vex_byte0_ == VEX2_PREFIX); byte checked = vex_byte0_ == VEX3_PREFIX ? vex_byte2_ : vex_byte1_; return (checked & 4) == 0; } bool vex_none() { DCHECK(vex_byte0_ == VEX3_PREFIX || vex_byte0_ == VEX2_PREFIX); byte checked = vex_byte0_ == VEX3_PREFIX ? vex_byte2_ : vex_byte1_; return (checked & 3) == 0; } bool vex_66() { DCHECK(vex_byte0_ == VEX3_PREFIX || vex_byte0_ == VEX2_PREFIX); byte checked = vex_byte0_ == VEX3_PREFIX ? vex_byte2_ : vex_byte1_; return (checked & 3) == 1; } bool vex_f3() { DCHECK(vex_byte0_ == VEX3_PREFIX || vex_byte0_ == VEX2_PREFIX); byte checked = vex_byte0_ == VEX3_PREFIX ? vex_byte2_ : vex_byte1_; return (checked & 3) == 2; } bool vex_f2() { DCHECK(vex_byte0_ == VEX3_PREFIX || vex_byte0_ == VEX2_PREFIX); byte checked = vex_byte0_ == VEX3_PREFIX ? vex_byte2_ : vex_byte1_; return (checked & 3) == 3; } bool vex_0f() { if (vex_byte0_ == VEX2_PREFIX) return true; return (vex_byte1_ & 3) == 1; } bool vex_0f38() { if (vex_byte0_ == VEX2_PREFIX) return false; return (vex_byte1_ & 3) == 2; } bool vex_0f3a() { if (vex_byte0_ == VEX2_PREFIX) return false; return (vex_byte1_ & 3) == 3; } int vex_vreg() { DCHECK(vex_byte0_ == VEX3_PREFIX || vex_byte0_ == VEX2_PREFIX); byte checked = vex_byte0_ == VEX3_PREFIX ? vex_byte2_ : vex_byte1_; return ~(checked >> 3) & 0xF; } OperandSize operand_size() { if (byte_size_operand_) return OPERAND_BYTE_SIZE; if (rex_w()) return OPERAND_QUADWORD_SIZE; if (operand_size_ != 0) return OPERAND_WORD_SIZE; return OPERAND_DOUBLEWORD_SIZE; } char operand_size_code() { return "bwlq"[operand_size()]; } char float_size_code() { return "sd"[rex_w()]; } const char* NameOfCPURegister(int reg) const { return converter_.NameOfCPURegister(reg); } const char* NameOfByteCPURegister(int reg) const { return converter_.NameOfByteCPURegister(reg); } const char* NameOfXMMRegister(int reg) const { return converter_.NameOfXMMRegister(reg); } const char* NameOfAddress(byte* addr) const { return converter_.NameOfAddress(addr); } // Disassembler helper functions. void get_modrm(byte data, int* mod, int* regop, int* rm) { *mod = (data >> 6) & 3; *regop = ((data & 0x38) >> 3) | (rex_r() ? 8 : 0); *rm = (data & 7) | (rex_b() ? 8 : 0); } void get_sib(byte data, int* scale, int* index, int* base) { *scale = (data >> 6) & 3; *index = ((data >> 3) & 7) | (rex_x() ? 8 : 0); *base = (data & 7) | (rex_b() ? 8 : 0); } typedef const char* (DisassemblerX64::*RegisterNameMapping)(int reg) const; void TryAppendRootRelativeName(int offset); int PrintRightOperandHelper(byte* modrmp, RegisterNameMapping register_name); int PrintRightOperand(byte* modrmp); int PrintRightByteOperand(byte* modrmp); int PrintRightXMMOperand(byte* modrmp); int PrintOperands(const char* mnem, OperandType op_order, byte* data); int PrintImmediate(byte* data, OperandSize size); int PrintImmediateOp(byte* data); const char* TwoByteMnemonic(byte opcode); int TwoByteOpcodeInstruction(byte* data); int F6F7Instruction(byte* data); int ShiftInstruction(byte* data); int JumpShort(byte* data); int JumpConditional(byte* data); int JumpConditionalShort(byte* data); int SetCC(byte* data); int FPUInstruction(byte* data); int MemoryFPUInstruction(int escape_opcode, int regop, byte* modrm_start); int RegisterFPUInstruction(int escape_opcode, byte modrm_byte); int AVXInstruction(byte* data); PRINTF_FORMAT(2, 3) void AppendToBuffer(const char* format, ...); void UnimplementedInstruction() { if (abort_on_unimplemented_) { FATAL("'Unimplemented Instruction'"); } else { AppendToBuffer("'Unimplemented Instruction'"); } } }; void DisassemblerX64::AppendToBuffer(const char* format, ...) { v8::internal::Vector<char> buf = tmp_buffer_ + tmp_buffer_pos_; va_list args; va_start(args, format); int result = v8::internal::VSNPrintF(buf, format, args); va_end(args); tmp_buffer_pos_ += result; } void DisassemblerX64::TryAppendRootRelativeName(int offset) { const char* maybe_name = converter_.RootRelativeName(offset); if (maybe_name != nullptr) AppendToBuffer(" (%s)", maybe_name); } int DisassemblerX64::PrintRightOperandHelper( byte* modrmp, RegisterNameMapping direct_register_name) { int mod, regop, rm; get_modrm(*modrmp, &mod, ®op, &rm); RegisterNameMapping register_name = (mod == 3) ? direct_register_name : &DisassemblerX64::NameOfCPURegister; switch (mod) { case 0: if ((rm & 7) == 5) { int32_t disp = *reinterpret_cast<int32_t*>(modrmp + 1); AppendToBuffer("[rip+0x%x]", disp); return 5; } else if ((rm & 7) == 4) { // Codes for SIB byte. byte sib = *(modrmp + 1); int scale, index, base; get_sib(sib, &scale, &index, &base); if (index == 4 && (base & 7) == 4 && scale == 0 /*times_1*/) { // index == rsp means no index. Only use sib byte with no index for // rsp and r12 base. AppendToBuffer("[%s]", NameOfCPURegister(base)); return 2; } else if (base == 5) { // base == rbp means no base register (when mod == 0). int32_t disp = *reinterpret_cast<int32_t*>(modrmp + 2); AppendToBuffer("[%s*%d%s0x%x]", NameOfCPURegister(index), 1 << scale, disp < 0 ? "-" : "+", disp < 0 ? -disp : disp); return 6; } else if (index != 4 && base != 5) { // [base+index*scale] AppendToBuffer("[%s+%s*%d]", NameOfCPURegister(base), NameOfCPURegister(index), 1 << scale); return 2; } else { UnimplementedInstruction(); return 1; } } else { AppendToBuffer("[%s]", NameOfCPURegister(rm)); return 1; } break; case 1: // fall through case 2: if ((rm & 7) == 4) { byte sib = *(modrmp + 1); int scale, index, base; get_sib(sib, &scale, &index, &base); int disp = (mod == 2) ? *reinterpret_cast<int32_t*>(modrmp + 2) : *reinterpret_cast<int8_t*>(modrmp + 2); if (index == 4 && (base & 7) == 4 && scale == 0 /*times_1*/) { AppendToBuffer("[%s%s0x%x]", NameOfCPURegister(base), disp < 0 ? "-" : "+", disp < 0 ? -disp : disp); } else { AppendToBuffer("[%s+%s*%d%s0x%x]", NameOfCPURegister(base), NameOfCPURegister(index), 1 << scale, disp < 0 ? "-" : "+", disp < 0 ? -disp : disp); } return mod == 2 ? 6 : 3; } else { // No sib. int disp = (mod == 2) ? *reinterpret_cast<int32_t*>(modrmp + 1) : *reinterpret_cast<int8_t*>(modrmp + 1); AppendToBuffer("[%s%s0x%x]", NameOfCPURegister(rm), disp < 0 ? "-" : "+", disp < 0 ? -disp : disp); if (rm == i::kRootRegister.code()) { // For root-relative accesses, try to append a description. TryAppendRootRelativeName(disp); } return (mod == 2) ? 5 : 2; } break; case 3: AppendToBuffer("%s", (this->*register_name)(rm)); return 1; default: UnimplementedInstruction(); return 1; } UNREACHABLE(); } int DisassemblerX64::PrintImmediate(byte* data, OperandSize size) { int64_t value; int count; switch (size) { case OPERAND_BYTE_SIZE: value = *data; count = 1; break; case OPERAND_WORD_SIZE: value = *reinterpret_cast<int16_t*>(data); count = 2; break; case OPERAND_DOUBLEWORD_SIZE: value = *reinterpret_cast<uint32_t*>(data); count = 4; break; case OPERAND_QUADWORD_SIZE: value = *reinterpret_cast<int32_t*>(data); count = 4; break; default: UNREACHABLE(); } AppendToBuffer("%" PRIx64, value); return count; } int DisassemblerX64::PrintRightOperand(byte* modrmp) { return PrintRightOperandHelper(modrmp, &DisassemblerX64::NameOfCPURegister); } int DisassemblerX64::PrintRightByteOperand(byte* modrmp) { return PrintRightOperandHelper(modrmp, &DisassemblerX64::NameOfByteCPURegister); } int DisassemblerX64::PrintRightXMMOperand(byte* modrmp) { return PrintRightOperandHelper(modrmp, &DisassemblerX64::NameOfXMMRegister); } // Returns number of bytes used including the current *data. // Writes instruction's mnemonic, left and right operands to 'tmp_buffer_'. int DisassemblerX64::PrintOperands(const char* mnem, OperandType op_order, byte* data) { byte modrm = *data; int mod, regop, rm; get_modrm(modrm, &mod, ®op, &rm); int advance = 0; const char* register_name = byte_size_operand_ ? NameOfByteCPURegister(regop) : NameOfCPURegister(regop); switch (op_order) { case REG_OPER_OP_ORDER: { AppendToBuffer("%s%c %s,", mnem, operand_size_code(), register_name); advance = byte_size_operand_ ? PrintRightByteOperand(data) : PrintRightOperand(data); break; } case OPER_REG_OP_ORDER: { AppendToBuffer("%s%c ", mnem, operand_size_code()); advance = byte_size_operand_ ? PrintRightByteOperand(data) : PrintRightOperand(data); AppendToBuffer(",%s", register_name); break; } default: UNREACHABLE(); break; } return advance; } // Returns number of bytes used by machine instruction, including *data byte. // Writes immediate instructions to 'tmp_buffer_'. int DisassemblerX64::PrintImmediateOp(byte* data) { bool byte_size_immediate = (*data & 0x02) != 0; byte modrm = *(data + 1); int mod, regop, rm; get_modrm(modrm, &mod, ®op, &rm); const char* mnem = "Imm???"; switch (regop) { case 0: mnem = "add"; break; case 1: mnem = "or"; break; case 2: mnem = "adc"; break; case 3: mnem = "sbb"; break; case 4: mnem = "and"; break; case 5: mnem = "sub"; break; case 6: mnem = "xor"; break; case 7: mnem = "cmp"; break; default: UnimplementedInstruction(); } AppendToBuffer("%s%c ", mnem, operand_size_code()); int count = PrintRightOperand(data + 1); AppendToBuffer(",0x"); OperandSize immediate_size = byte_size_immediate ? OPERAND_BYTE_SIZE : operand_size(); count += PrintImmediate(data + 1 + count, immediate_size); return 1 + count; } // Returns number of bytes used, including *data. int DisassemblerX64::F6F7Instruction(byte* data) { DCHECK(*data == 0xF7 || *data == 0xF6); byte modrm = *(data + 1); int mod, regop, rm; get_modrm(modrm, &mod, ®op, &rm); if (mod == 3 && regop != 0) { const char* mnem = nullptr; switch (regop) { case 2: mnem = "not"; break; case 3: mnem = "neg"; break; case 4: mnem = "mul"; break; case 5: mnem = "imul"; break; case 6: mnem = "div"; break; case 7: mnem = "idiv"; break; default: UnimplementedInstruction(); } AppendToBuffer("%s%c %s", mnem, operand_size_code(), NameOfCPURegister(rm)); return 2; } else if (regop == 0) { AppendToBuffer("test%c ", operand_size_code()); int count = PrintRightOperand(data + 1); // Use name of 64-bit register. AppendToBuffer(",0x"); count += PrintImmediate(data + 1 + count, operand_size()); return 1 + count; } else { UnimplementedInstruction(); return 2; } } int DisassemblerX64::ShiftInstruction(byte* data) { byte op = *data & (~1); int count = 1; if (op != 0xD0 && op != 0xD2 && op != 0xC0) { UnimplementedInstruction(); return count; } // Print mneumonic. { byte modrm = *(data + count); int mod, regop, rm; get_modrm(modrm, &mod, ®op, &rm); regop &= 0x7; // The REX.R bit does not affect the operation. const char* mnem = nullptr; switch (regop) { case 0: mnem = "rol"; break; case 1: mnem = "ror"; break; case 2: mnem = "rcl"; break; case 3: mnem = "rcr"; break; case 4: mnem = "shl"; break; case 5: mnem = "shr"; break; case 7: mnem = "sar"; break; default: UnimplementedInstruction(); return count + 1; } DCHECK_NOT_NULL(mnem); AppendToBuffer("%s%c ", mnem, operand_size_code()); } count += PrintRightOperand(data + count); if (op == 0xD2) { AppendToBuffer(", cl"); } else { int imm8 = -1; if (op == 0xD0) { imm8 = 1; } else { DCHECK_EQ(0xC0, op); imm8 = *(data + count); count++; } AppendToBuffer(", %d", imm8); } return count; } // Returns number of bytes used, including *data. int DisassemblerX64::JumpShort(byte* data) { DCHECK_EQ(0xEB, *data); byte b = *(data + 1); byte* dest = data + static_cast<int8_t>(b) + 2; AppendToBuffer("jmp %s", NameOfAddress(dest)); return 2; } // Returns number of bytes used, including *data. int DisassemblerX64::JumpConditional(byte* data) { DCHECK_EQ(0x0F, *data); byte cond = *(data + 1) & 0x0F; byte* dest = data + *reinterpret_cast<int32_t*>(data + 2) + 6; const char* mnem = conditional_code_suffix[cond]; AppendToBuffer("j%s %s", mnem, NameOfAddress(dest)); return 6; // includes 0x0F } // Returns number of bytes used, including *data. int DisassemblerX64::JumpConditionalShort(byte* data) { byte cond = *data & 0x0F; byte b = *(data + 1); byte* dest = data + static_cast<int8_t>(b) + 2; const char* mnem = conditional_code_suffix[cond]; AppendToBuffer("j%s %s", mnem, NameOfAddress(dest)); return 2; } // Returns number of bytes used, including *data. int DisassemblerX64::SetCC(byte* data) { DCHECK_EQ(0x0F, *data); byte cond = *(data + 1) & 0x0F; const char* mnem = conditional_code_suffix[cond]; AppendToBuffer("set%s%c ", mnem, operand_size_code()); PrintRightByteOperand(data + 2); return 3; // includes 0x0F } const char* sf_str[4] = {"", "rl", "ra", "ll"}; int DisassemblerX64::AVXInstruction(byte* data) { byte opcode = *data; byte* current = data + 1; if (vex_66() && vex_0f38()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0x99: AppendToBuffer("vfmadd132s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xA9: AppendToBuffer("vfmadd213s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xB9: AppendToBuffer("vfmadd231s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x9B: AppendToBuffer("vfmsub132s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xAB: AppendToBuffer("vfmsub213s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xBB: AppendToBuffer("vfmsub231s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x9D: AppendToBuffer("vfnmadd132s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xAD: AppendToBuffer("vfnmadd213s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xBD: AppendToBuffer("vfnmadd231s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x9F: AppendToBuffer("vfnmsub132s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xAF: AppendToBuffer("vfnmsub213s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xBF: AppendToBuffer("vfnmsub231s%c %s,%s,", float_size_code(), NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xF7: AppendToBuffer("shlx%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfCPURegister(vvvv)); break; #define DECLARE_SSE_AVX_DIS_CASE(instruction, notUsed1, notUsed2, notUsed3, \ opcode) \ case 0x##opcode: { \ AppendToBuffer("v" #instruction " %s,%s,", NameOfXMMRegister(regop), \ NameOfXMMRegister(vvvv)); \ current += PrintRightXMMOperand(current); \ break; \ } SSSE3_INSTRUCTION_LIST(DECLARE_SSE_AVX_DIS_CASE) SSE4_INSTRUCTION_LIST(DECLARE_SSE_AVX_DIS_CASE) #undef DECLARE_SSE_AVX_DIS_CASE default: UnimplementedInstruction(); } } else if (vex_66() && vex_0f3a()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0x0A: AppendToBuffer("vroundss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", *current++); break; case 0x0B: AppendToBuffer("vroundsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", *current++); break; case 0x14: AppendToBuffer("vpextrb "); current += PrintRightByteOperand(current); AppendToBuffer(",%s,0x%x,", NameOfXMMRegister(regop), *current++); break; case 0x15: AppendToBuffer("vpextrw "); current += PrintRightOperand(current); AppendToBuffer(",%s,0x%x,", NameOfXMMRegister(regop), *current++); break; case 0x16: AppendToBuffer("vpextrd "); current += PrintRightOperand(current); AppendToBuffer(",%s,0x%x,", NameOfXMMRegister(regop), *current++); break; case 0x20: AppendToBuffer("vpinsrb %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightByteOperand(current); AppendToBuffer(",0x%x", *current++); break; case 0x22: AppendToBuffer("vpinsrd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightOperand(current); AppendToBuffer(",0x%x", *current++); break; default: UnimplementedInstruction(); } } else if (vex_f3() && vex_0f()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0x10: AppendToBuffer("vmovss %s,", NameOfXMMRegister(regop)); if (mod == 3) { AppendToBuffer("%s,", NameOfXMMRegister(vvvv)); } current += PrintRightXMMOperand(current); break; case 0x11: AppendToBuffer("vmovss "); current += PrintRightXMMOperand(current); if (mod == 3) { AppendToBuffer(",%s", NameOfXMMRegister(vvvv)); } AppendToBuffer(",%s", NameOfXMMRegister(regop)); break; case 0x2A: AppendToBuffer("%s %s,%s,", vex_w() ? "vcvtqsi2ss" : "vcvtlsi2ss", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightOperand(current); break; case 0x2C: AppendToBuffer("vcvttss2si%s %s,", vex_w() ? "q" : "", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); break; case 0x51: AppendToBuffer("vsqrtss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x58: AppendToBuffer("vaddss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x59: AppendToBuffer("vmulss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5A: AppendToBuffer("vcvtss2sd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5C: AppendToBuffer("vsubss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5D: AppendToBuffer("vminss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5E: AppendToBuffer("vdivss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5F: AppendToBuffer("vmaxss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; default: UnimplementedInstruction(); } } else if (vex_f2() && vex_0f()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0x10: AppendToBuffer("vmovsd %s,", NameOfXMMRegister(regop)); if (mod == 3) { AppendToBuffer("%s,", NameOfXMMRegister(vvvv)); } current += PrintRightXMMOperand(current); break; case 0x11: AppendToBuffer("vmovsd "); current += PrintRightXMMOperand(current); if (mod == 3) { AppendToBuffer(",%s", NameOfXMMRegister(vvvv)); } AppendToBuffer(",%s", NameOfXMMRegister(regop)); break; case 0x2A: AppendToBuffer("%s %s,%s,", vex_w() ? "vcvtqsi2sd" : "vcvtlsi2sd", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightOperand(current); break; case 0x2C: AppendToBuffer("vcvttsd2si%s %s,", vex_w() ? "q" : "", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); break; case 0x2D: AppendToBuffer("vcvtsd2si%s %s,", vex_w() ? "q" : "", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); break; case 0x51: AppendToBuffer("vsqrtsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x58: AppendToBuffer("vaddsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x59: AppendToBuffer("vmulsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5A: AppendToBuffer("vcvtsd2ss %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5C: AppendToBuffer("vsubsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5D: AppendToBuffer("vminsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5E: AppendToBuffer("vdivsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x5F: AppendToBuffer("vmaxsd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xF0: AppendToBuffer("vlddqu %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); break; case 0x7C: AppendToBuffer("vhaddps %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; default: UnimplementedInstruction(); } } else if (vex_none() && vex_0f38()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); const char* mnem = "?"; switch (opcode) { case 0xF2: AppendToBuffer("andn%c %s,%s,", operand_size_code(), NameOfCPURegister(regop), NameOfCPURegister(vvvv)); current += PrintRightOperand(current); break; case 0xF5: AppendToBuffer("bzhi%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfCPURegister(vvvv)); break; case 0xF7: AppendToBuffer("bextr%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfCPURegister(vvvv)); break; case 0xF3: switch (regop) { case 1: mnem = "blsr"; break; case 2: mnem = "blsmsk"; break; case 3: mnem = "blsi"; break; default: UnimplementedInstruction(); } AppendToBuffer("%s%c %s,", mnem, operand_size_code(), NameOfCPURegister(vvvv)); current += PrintRightOperand(current); mnem = "?"; break; default: UnimplementedInstruction(); } } else if (vex_f2() && vex_0f38()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0xF5: AppendToBuffer("pdep%c %s,%s,", operand_size_code(), NameOfCPURegister(regop), NameOfCPURegister(vvvv)); current += PrintRightOperand(current); break; case 0xF6: AppendToBuffer("mulx%c %s,%s,", operand_size_code(), NameOfCPURegister(regop), NameOfCPURegister(vvvv)); current += PrintRightOperand(current); break; case 0xF7: AppendToBuffer("shrx%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfCPURegister(vvvv)); break; default: UnimplementedInstruction(); } } else if (vex_f3() && vex_0f38()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0xF5: AppendToBuffer("pext%c %s,%s,", operand_size_code(), NameOfCPURegister(regop), NameOfCPURegister(vvvv)); current += PrintRightOperand(current); break; case 0xF7: AppendToBuffer("sarx%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfCPURegister(vvvv)); break; default: UnimplementedInstruction(); } } else if (vex_f2() && vex_0f3a()) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0xF0: AppendToBuffer("rorx%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); switch (operand_size()) { case OPERAND_DOUBLEWORD_SIZE: AppendToBuffer(",%d", *current & 0x1F); break; case OPERAND_QUADWORD_SIZE: AppendToBuffer(",%d", *current & 0x3F); break; default: UnimplementedInstruction(); } current += 1; break; default: UnimplementedInstruction(); } } else if (vex_none() && vex_0f()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0x10: AppendToBuffer("vmovups %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); break; case 0x11: AppendToBuffer("vmovups "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); break; case 0x28: AppendToBuffer("vmovaps %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); break; case 0x29: AppendToBuffer("vmovaps "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); break; case 0x2E: AppendToBuffer("vucomiss %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); break; case 0x50: AppendToBuffer("vmovmskps %s,", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); break; case 0x54: AppendToBuffer("vandps %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x57: AppendToBuffer("vxorps %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0xC2: { AppendToBuffer("vcmpps %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); const char* const pseudo_op[] = {"eq", "lt", "le", "unord", "neq", "nlt", "nle", "ord"}; AppendToBuffer(", (%s)", pseudo_op[*current]); current += 1; break; } default: UnimplementedInstruction(); } } else if (vex_66() && vex_0f()) { int mod, regop, rm, vvvv = vex_vreg(); get_modrm(*current, &mod, ®op, &rm); switch (opcode) { case 0x10: AppendToBuffer("vmovupd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); break; case 0x11: AppendToBuffer("vmovupd "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); break; case 0x28: AppendToBuffer("vmovapd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); break; case 0x29: AppendToBuffer("vmovapd "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); break; case 0x2E: AppendToBuffer("vucomisd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); break; case 0x50: AppendToBuffer("vmovmskpd %s,", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); break; case 0x54: AppendToBuffer("vandpd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x56: AppendToBuffer("vorpd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x57: AppendToBuffer("vxorpd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); break; case 0x6E: AppendToBuffer("vmov%c %s,", vex_w() ? 'q' : 'd', NameOfXMMRegister(regop)); current += PrintRightOperand(current); break; case 0x70: AppendToBuffer("vpshufd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", *current++); break; case 0x71: AppendToBuffer("vps%sw %s,", sf_str[regop / 2], NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); AppendToBuffer(",%u", *current++); break; case 0x72: AppendToBuffer("vps%sd %s,", sf_str[regop / 2], NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); AppendToBuffer(",%u", *current++); break; case 0x73: AppendToBuffer("vps%sq %s,", sf_str[regop / 2], NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); AppendToBuffer(",%u", *current++); break; case 0x7E: AppendToBuffer("vmov%c ", vex_w() ? 'q' : 'd'); current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); break; case 0xC2: { AppendToBuffer("vcmppd %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightXMMOperand(current); const char* const pseudo_op[] = {"eq", "lt", "le", "unord", "neq", "nlt", "nle", "ord"}; AppendToBuffer(", (%s)", pseudo_op[*current]); current += 1; break; } case 0xC4: AppendToBuffer("vpinsrw %s,%s,", NameOfXMMRegister(regop), NameOfXMMRegister(vvvv)); current += PrintRightOperand(current); AppendToBuffer(",0x%x", *current++); break; case 0xC5: AppendToBuffer("vpextrw %s,", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", *current++); break; #define DECLARE_SSE_AVX_DIS_CASE(instruction, notUsed1, notUsed2, opcode) \ case 0x##opcode: { \ AppendToBuffer("v" #instruction " %s,%s,", NameOfXMMRegister(regop), \ NameOfXMMRegister(vvvv)); \ current += PrintRightXMMOperand(current); \ break; \ } SSE2_INSTRUCTION_LIST(DECLARE_SSE_AVX_DIS_CASE) #undef DECLARE_SSE_AVX_DIS_CASE default: UnimplementedInstruction(); } } else { UnimplementedInstruction(); } return static_cast<int>(current - data); } // Returns number of bytes used, including *data. int DisassemblerX64::FPUInstruction(byte* data) { byte escape_opcode = *data; DCHECK_EQ(0xD8, escape_opcode & 0xF8); byte modrm_byte = *(data+1); if (modrm_byte >= 0xC0) { return RegisterFPUInstruction(escape_opcode, modrm_byte); } else { return MemoryFPUInstruction(escape_opcode, modrm_byte, data+1); } } int DisassemblerX64::MemoryFPUInstruction(int escape_opcode, int modrm_byte, byte* modrm_start) { const char* mnem = "?"; int regop = (modrm_byte >> 3) & 0x7; // reg/op field of modrm byte. switch (escape_opcode) { case 0xD9: switch (regop) { case 0: mnem = "fld_s"; break; case 3: mnem = "fstp_s"; break; case 7: mnem = "fstcw"; break; default: UnimplementedInstruction(); } break; case 0xDB: switch (regop) { case 0: mnem = "fild_s"; break; case 1: mnem = "fisttp_s"; break; case 2: mnem = "fist_s"; break; case 3: mnem = "fistp_s"; break; default: UnimplementedInstruction(); } break; case 0xDD: switch (regop) { case 0: mnem = "fld_d"; break; case 3: mnem = "fstp_d"; break; default: UnimplementedInstruction(); } break; case 0xDF: switch (regop) { case 5: mnem = "fild_d"; break; case 7: mnem = "fistp_d"; break; default: UnimplementedInstruction(); } break; default: UnimplementedInstruction(); } AppendToBuffer("%s ", mnem); int count = PrintRightOperand(modrm_start); return count + 1; } int DisassemblerX64::RegisterFPUInstruction(int escape_opcode, byte modrm_byte) { bool has_register = false; // Is the FPU register encoded in modrm_byte? const char* mnem = "?"; switch (escape_opcode) { case 0xD8: UnimplementedInstruction(); break; case 0xD9: switch (modrm_byte & 0xF8) { case 0xC0: mnem = "fld"; has_register = true; break; case 0xC8: mnem = "fxch"; has_register = true; break; default: switch (modrm_byte) { case 0xE0: mnem = "fchs"; break; case 0xE1: mnem = "fabs"; break; case 0xE3: mnem = "fninit"; break; case 0xE4: mnem = "ftst"; break; case 0xE8: mnem = "fld1"; break; case 0xEB: mnem = "fldpi"; break; case 0xED: mnem = "fldln2"; break; case 0xEE: mnem = "fldz"; break; case 0xF0: mnem = "f2xm1"; break; case 0xF1: mnem = "fyl2x"; break; case 0xF2: mnem = "fptan"; break; case 0xF5: mnem = "fprem1"; break; case 0xF7: mnem = "fincstp"; break; case 0xF8: mnem = "fprem"; break; case 0xFC: mnem = "frndint"; break; case 0xFD: mnem = "fscale"; break; case 0xFE: mnem = "fsin"; break; case 0xFF: mnem = "fcos"; break; default: UnimplementedInstruction(); } } break; case 0xDA: if (modrm_byte == 0xE9) { mnem = "fucompp"; } else { UnimplementedInstruction(); } break; case 0xDB: if ((modrm_byte & 0xF8) == 0xE8) { mnem = "fucomi"; has_register = true; } else if (modrm_byte == 0xE2) { mnem = "fclex"; } else if (modrm_byte == 0xE3) { mnem = "fninit"; } else { UnimplementedInstruction(); } break; case 0xDC: has_register = true; switch (modrm_byte & 0xF8) { case 0xC0: mnem = "fadd"; break; case 0xE8: mnem = "fsub"; break; case 0xC8: mnem = "fmul"; break; case 0xF8: mnem = "fdiv"; break; default: UnimplementedInstruction(); } break; case 0xDD: has_register = true; switch (modrm_byte & 0xF8) { case 0xC0: mnem = "ffree"; break; case 0xD8: mnem = "fstp"; break; default: UnimplementedInstruction(); } break; case 0xDE: if (modrm_byte == 0xD9) { mnem = "fcompp"; } else { has_register = true; switch (modrm_byte & 0xF8) { case 0xC0: mnem = "faddp"; break; case 0xE8: mnem = "fsubp"; break; case 0xC8: mnem = "fmulp"; break; case 0xF8: mnem = "fdivp"; break; default: UnimplementedInstruction(); } } break; case 0xDF: if (modrm_byte == 0xE0) { mnem = "fnstsw_ax"; } else if ((modrm_byte & 0xF8) == 0xE8) { mnem = "fucomip"; has_register = true; } break; default: UnimplementedInstruction(); } if (has_register) { AppendToBuffer("%s st%d", mnem, modrm_byte & 0x7); } else { AppendToBuffer("%s", mnem); } return 2; } // Handle all two-byte opcodes, which start with 0x0F. // These instructions may be affected by an 0x66, 0xF2, or 0xF3 prefix. // We do not use any three-byte opcodes, which start with 0x0F38 or 0x0F3A. int DisassemblerX64::TwoByteOpcodeInstruction(byte* data) { byte opcode = *(data + 1); byte* current = data + 2; // At return, "current" points to the start of the next instruction. const char* mnemonic = TwoByteMnemonic(opcode); if (operand_size_ == 0x66) { // 0x66 0x0F prefix. int mod, regop, rm; if (opcode == 0x38) { byte third_byte = *current; current = data + 3; get_modrm(*current, &mod, ®op, &rm); switch (third_byte) { #define SSE34_DIS_CASE(instruction, notUsed1, notUsed2, notUsed3, opcode) \ case 0x##opcode: { \ AppendToBuffer(#instruction " %s,", NameOfXMMRegister(regop)); \ current += PrintRightXMMOperand(current); \ break; \ } SSSE3_INSTRUCTION_LIST(SSE34_DIS_CASE) SSE4_INSTRUCTION_LIST(SSE34_DIS_CASE) #undef SSE34_DIS_CASE default: UnimplementedInstruction(); } } else if (opcode == 0x3A) { byte third_byte = *current; current = data + 3; if (third_byte == 0x17) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("extractps "); // reg/m32, xmm, imm8 current += PrintRightOperand(current); AppendToBuffer(",%s,%d", NameOfXMMRegister(regop), (*current) & 3); current += 1; } else if (third_byte == 0x0A) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("roundss %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", (*current) & 3); current += 1; } else if (third_byte == 0x0B) { get_modrm(*current, &mod, ®op, &rm); // roundsd xmm, xmm/m64, imm8 AppendToBuffer("roundsd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", (*current) & 3); current += 1; } else if (third_byte == 0x0E) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pblendw %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(data); AppendToBuffer(",0x%x", (*current) & 3); current += 1; } else if (third_byte == 0x0F) { get_modrm(*data, &mod, ®op, &rm); AppendToBuffer("palignr %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(data); AppendToBuffer(",0x%x", (*current) & 3); current += 1; } else if (third_byte == 0x14) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pextrb "); // reg/m32, xmm, imm8 current += PrintRightOperand(current); AppendToBuffer(",%s,%d", NameOfXMMRegister(regop), (*current) & 3); current += 1; } else if (third_byte == 0x15) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pextrw "); // reg/m32, xmm, imm8 current += PrintRightOperand(current); AppendToBuffer(",%s,%d", NameOfXMMRegister(regop), (*current) & 7); current += 1; } else if (third_byte == 0x16) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pextrd "); // reg/m32, xmm, imm8 current += PrintRightOperand(current); AppendToBuffer(",%s,%d", NameOfXMMRegister(regop), (*current) & 3); current += 1; } else if (third_byte == 0x20) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pinsrd "); // xmm, reg/m32, imm8 AppendToBuffer(" %s,", NameOfXMMRegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",%d", (*current) & 3); current += 1; } else if (third_byte == 0x21) { get_modrm(*current, &mod, ®op, &rm); // insertps xmm, xmm/m32, imm8 AppendToBuffer("insertps %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", (*current) & 3); current += 1; } else if (third_byte == 0x22) { get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pinsrd "); // xmm, reg/m32, imm8 AppendToBuffer(" %s,", NameOfXMMRegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",%d", (*current) & 3); current += 1; } else { UnimplementedInstruction(); } } else { get_modrm(*current, &mod, ®op, &rm); if (opcode == 0x1F) { current++; if (rm == 4) { // SIB byte present. current++; } if (mod == 1) { // Byte displacement. current += 1; } else if (mod == 2) { // 32-bit displacement. current += 4; } // else no immediate displacement. AppendToBuffer("nop"); } else if (opcode == 0x10) { AppendToBuffer("movupd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x11) { AppendToBuffer("movupd "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else if (opcode == 0x28) { AppendToBuffer("movapd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x29) { AppendToBuffer("movapd "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else if (opcode == 0x6E) { AppendToBuffer("mov%c %s,", rex_w() ? 'q' : 'd', NameOfXMMRegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0x6F) { AppendToBuffer("movdqa %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x7E) { AppendToBuffer("mov%c ", rex_w() ? 'q' : 'd'); current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else if (opcode == 0x7F) { AppendToBuffer("movdqa "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else if (opcode == 0xD6) { AppendToBuffer("movq "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else if (opcode == 0x50) { AppendToBuffer("movmskpd %s,", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x70) { AppendToBuffer("pshufd %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(",0x%x", *current); current += 1; } else if (opcode == 0x71) { current += 1; AppendToBuffer("ps%sw %s,%d", sf_str[regop / 2], NameOfXMMRegister(rm), *current & 0x7F); current += 1; } else if (opcode == 0x72) { current += 1; AppendToBuffer("ps%sd %s,%d", sf_str[regop / 2], NameOfXMMRegister(rm), *current & 0x7F); current += 1; } else if (opcode == 0x73) { current += 1; AppendToBuffer("ps%sq %s,%d", sf_str[regop / 2], NameOfXMMRegister(rm), *current & 0x7F); current += 1; } else if (opcode == 0xB1) { current += PrintOperands("cmpxchg", OPER_REG_OP_ORDER, current); } else if (opcode == 0xC4) { AppendToBuffer("pinsrw %s,", NameOfXMMRegister(regop)); current += PrintRightOperand(current); AppendToBuffer(",0x%x", (*current) & 7); current += 1; } else { const char* mnemonic; if (opcode == 0x54) { mnemonic = "andpd"; } else if (opcode == 0x56) { mnemonic = "orpd"; } else if (opcode == 0x57) { mnemonic = "xorpd"; } else if (opcode == 0x5B) { mnemonic = "cvtps2dq"; } else if (opcode == 0x60) { mnemonic = "punpcklbw"; } else if (opcode == 0x61) { mnemonic = "punpcklwd"; } else if (opcode == 0x62) { mnemonic = "punpckldq"; } else if (opcode == 0x63) { mnemonic = "packsswb"; } else if (opcode == 0x64) { mnemonic = "pcmpgtb"; } else if (opcode == 0x65) { mnemonic = "pcmpgtw"; } else if (opcode == 0x66) { mnemonic = "pcmpgtd"; } else if (opcode == 0x67) { mnemonic = "packuswb"; } else if (opcode == 0x68) { mnemonic = "punpckhbw"; } else if (opcode == 0x69) { mnemonic = "punpckhwd"; } else if (opcode == 0x6A) { mnemonic = "punpckhdq"; } else if (opcode == 0x6B) { mnemonic = "packssdw"; } else if (opcode == 0x6C) { mnemonic = "punpcklqdq"; } else if (opcode == 0x6D) { mnemonic = "punpckhqdq"; } else if (opcode == 0x2E) { mnemonic = "ucomisd"; } else if (opcode == 0x2F) { mnemonic = "comisd"; } else if (opcode == 0x74) { mnemonic = "pcmpeqb"; } else if (opcode == 0x75) { mnemonic = "pcmpeqw"; } else if (opcode == 0x76) { mnemonic = "pcmpeqd"; } else if (opcode == 0xD1) { mnemonic = "psrlw"; } else if (opcode == 0xD2) { mnemonic = "psrld"; } else if (opcode == 0xD5) { mnemonic = "pmullw"; } else if (opcode == 0xD7) { mnemonic = "pmovmskb"; } else if (opcode == 0xD8) { mnemonic = "psubusb"; } else if (opcode == 0xD9) { mnemonic = "psubusw"; } else if (opcode == 0xDA) { mnemonic = "pand"; } else if (opcode == 0xDB) { mnemonic = "pminub"; } else if (opcode == 0xDC) { mnemonic = "paddusb"; } else if (opcode == 0xDD) { mnemonic = "paddusw"; } else if (opcode == 0xDE) { mnemonic = "pmaxub"; } else if (opcode == 0xE1) { mnemonic = "psraw"; } else if (opcode == 0xE2) { mnemonic = "psrad"; } else if (opcode == 0xE8) { mnemonic = "psubsb"; } else if (opcode == 0xE9) { mnemonic = "psubsw"; } else if (opcode == 0xEA) { mnemonic = "pminsw"; } else if (opcode == 0xEB) { mnemonic = "por"; } else if (opcode == 0xEC) { mnemonic = "paddsb"; } else if (opcode == 0xED) { mnemonic = "paddsw"; } else if (opcode == 0xEE) { mnemonic = "pmaxsw"; } else if (opcode == 0xEF) { mnemonic = "pxor"; } else if (opcode == 0xF1) { mnemonic = "psllw"; } else if (opcode == 0xF2) { mnemonic = "pslld"; } else if (opcode == 0xF4) { mnemonic = "pmuludq"; } else if (opcode == 0xF8) { mnemonic = "psubb"; } else if (opcode == 0xF9) { mnemonic = "psubw"; } else if (opcode == 0xFA) { mnemonic = "psubd"; } else if (opcode == 0xFC) { mnemonic = "paddb"; } else if (opcode == 0xFD) { mnemonic = "paddw"; } else if (opcode == 0xFE) { mnemonic = "paddd"; } else if (opcode == 0xC2) { mnemonic = "cmppd"; } else { UnimplementedInstruction(); } AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); if (opcode == 0xC2) { const char* const pseudo_op[] = {"eq", "lt", "le", "unord", "neq", "nlt", "nle", "ord"}; AppendToBuffer(", (%s)", pseudo_op[*current]); current += 1; } } } } else if (group_1_prefix_ == 0xF2) { // Beginning of instructions with prefix 0xF2. if (opcode == 0x11 || opcode == 0x10) { // MOVSD: Move scalar double-precision fp to/from/between XMM registers. AppendToBuffer("movsd "); int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); if (opcode == 0x11) { current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else { AppendToBuffer("%s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } } else if (opcode == 0x2A) { // CVTSI2SD: integer to XMM double conversion. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0x2C) { // CVTTSD2SI: // Convert with truncation scalar double-precision FP to integer. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("cvttsd2si%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x2D) { // CVTSD2SI: Convert scalar double-precision FP to integer. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("cvtsd2si%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x5B) { // CVTTPS2DQ: Convert packed single-precision FP values to packed signed // doubleword integer values int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("cvttps2dq%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); } else if ((opcode & 0xF8) == 0x58 || opcode == 0x51) { // XMM arithmetic. Mnemonic was retrieved at the start of this function. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x70) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pshuflw %s, ", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(", %d", (*current) & 7); current += 1; } else if (opcode == 0xC2) { // Intel manual 2A, Table 3-18. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); const char* const pseudo_op[] = { "cmpeqsd", "cmpltsd", "cmplesd", "cmpunordsd", "cmpneqsd", "cmpnltsd", "cmpnlesd", "cmpordsd" }; AppendToBuffer("%s %s,%s", pseudo_op[current[1]], NameOfXMMRegister(regop), NameOfXMMRegister(rm)); current += 2; } else if (opcode == 0xF0) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("lddqu %s,", NameOfXMMRegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0x7C) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("haddps %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else { UnimplementedInstruction(); } } else if (group_1_prefix_ == 0xF3) { // Instructions with prefix 0xF3. if (opcode == 0x11 || opcode == 0x10) { // MOVSS: Move scalar double-precision fp to/from/between XMM registers. AppendToBuffer("movss "); int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); if (opcode == 0x11) { current += PrintRightOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else { AppendToBuffer("%s,", NameOfXMMRegister(regop)); current += PrintRightOperand(current); } } else if (opcode == 0x2A) { // CVTSI2SS: integer to XMM single conversion. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0x2C) { // CVTTSS2SI: // Convert with truncation scalar single-precision FP to dword integer. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("cvttss2si%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x70) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pshufhw %s, ", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(", %d", (*current) & 7); current += 1; } else if (opcode == 0x6F) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("movdqu %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x7E) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("movq %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x7F) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("movdqu "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else if ((opcode & 0xF8) == 0x58 || opcode == 0x51) { // XMM arithmetic. Mnemonic was retrieved at the start of this function. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0xB8) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("popcnt%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0xBC) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("tzcnt%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0xBD) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("lzcnt%c %s,", operand_size_code(), NameOfCPURegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0xC2) { // Intel manual 2A, Table 3-18. int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); const char* const pseudo_op[] = {"cmpeqss", "cmpltss", "cmpless", "cmpunordss", "cmpneqss", "cmpnltss", "cmpnless", "cmpordss"}; AppendToBuffer("%s %s,%s", pseudo_op[current[1]], NameOfXMMRegister(regop), NameOfXMMRegister(rm)); current += 2; } else { UnimplementedInstruction(); } } else if (opcode == 0x10 || opcode == 0x11) { // movups xmm, xmm/m128 // movups xmm/m128, xmm int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("movups "); if (opcode == 0x11) { current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else { AppendToBuffer("%s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } } else if (opcode == 0x1F) { // NOP int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); current++; if (rm == 4) { // SIB byte present. current++; } if (mod == 1) { // Byte displacement. current += 1; } else if (mod == 2) { // 32-bit displacement. current += 4; } // else no immediate displacement. AppendToBuffer("nop"); } else if (opcode == 0x28) { // movaps xmm, xmm/m128 int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("movaps %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x29) { // movaps xmm/m128, xmm int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("movaps "); current += PrintRightXMMOperand(current); AppendToBuffer(",%s", NameOfXMMRegister(regop)); } else if (opcode == 0x2E) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("ucomiss %s,", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0xA2) { // CPUID AppendToBuffer("%s", mnemonic); } else if ((opcode & 0xF0) == 0x40) { // CMOVcc: conditional move. int condition = opcode & 0x0F; const InstructionDesc& idesc = cmov_instructions[condition]; byte_size_operand_ = idesc.byte_size_operation; current += PrintOperands(idesc.mnem, idesc.op_order_, current); } else if (opcode >= 0x51 && opcode <= 0x5F) { const char* const pseudo_op[] = { "sqrtps", "rsqrtps", "rcpps", "andps", "andnps", "orps", "xorps", "addps", "mulps", "cvtps2pd", "cvtdq2ps", "subps", "minps", "divps", "maxps", }; int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("%s %s,", pseudo_op[opcode - 0x51], NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0xC2) { // cmpps xmm, xmm/m128, imm8 int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); const char* const pseudo_op[] = {"eq", "lt", "le", "unord", "neq", "nlt", "nle", "ord"}; AppendToBuffer("cmpps %s, ", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(", %s", pseudo_op[*current]); current += 1; } else if (opcode == 0xC6) { // shufps xmm, xmm/m128, imm8 int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("shufps %s, ", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(", %d", (*current) & 3); current += 1; } else if (opcode >= 0xC8 && opcode <= 0xCF) { // bswap int reg = (opcode - 0xC8) | (rex_r() ? 8 : 0); AppendToBuffer("bswap%c %s", operand_size_code(), NameOfCPURegister(reg)); } else if (opcode == 0x50) { // movmskps reg, xmm int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("movmskps %s,", NameOfCPURegister(regop)); current += PrintRightXMMOperand(current); } else if (opcode == 0x70) { int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("pshufw %s, ", NameOfXMMRegister(regop)); current += PrintRightXMMOperand(current); AppendToBuffer(", %d", (*current) & 3); current += 1; } else if ((opcode & 0xF0) == 0x80) { // Jcc: Conditional jump (branch). current = data + JumpConditional(data); } else if (opcode == 0xBE || opcode == 0xBF || opcode == 0xB6 || opcode == 0xB7 || opcode == 0xAF) { // Size-extending moves, IMUL. current += PrintOperands(mnemonic, REG_OPER_OP_ORDER, current); } else if ((opcode & 0xF0) == 0x90) { // SETcc: Set byte on condition. Needs pointer to beginning of instruction. current = data + SetCC(data); } else if (opcode == 0xA3 || opcode == 0xA5 || opcode == 0xAB || opcode == 0xAD) { // BT (bit test), SHLD, BTS (bit test and set), // SHRD (double-precision shift) AppendToBuffer("%s ", mnemonic); int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); current += PrintRightOperand(current); if (opcode == 0xAB) { AppendToBuffer(",%s", NameOfCPURegister(regop)); } else { AppendToBuffer(",%s,cl", NameOfCPURegister(regop)); } } else if (opcode == 0xBA) { // BTS / BTR (bit test and set/reset) with immediate int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); mnemonic = regop == 5 ? "bts" : regop == 6 ? "btr" : "?"; AppendToBuffer("%s ", mnemonic); current += PrintRightOperand(current); AppendToBuffer(",%d", *current++); } else if (opcode == 0xB8 || opcode == 0xBC || opcode == 0xBD) { // POPCNT, CTZ, CLZ. AppendToBuffer("%s%c ", mnemonic, operand_size_code()); int mod, regop, rm; get_modrm(*current, &mod, ®op, &rm); AppendToBuffer("%s,", NameOfCPURegister(regop)); current += PrintRightOperand(current); } else if (opcode == 0x0B) { AppendToBuffer("ud2"); } else if (opcode == 0xB0 || opcode == 0xB1) { // CMPXCHG. if (opcode == 0xB0) { byte_size_operand_ = true; } current += PrintOperands(mnemonic, OPER_REG_OP_ORDER, current); } else if (opcode == 0xAE && (*(data + 2) & 0xF8) == 0xE8) { AppendToBuffer("lfence"); current = data + 3; } else { UnimplementedInstruction(); } return static_cast<int>(current - data); } // Mnemonics for two-byte opcode instructions starting with 0x0F. // The argument is the second byte of the two-byte opcode. // Returns nullptr if the instruction is not handled here. const char* DisassemblerX64::TwoByteMnemonic(byte opcode) { if (opcode >= 0xC8 && opcode <= 0xCF) return "bswap"; switch (opcode) { case 0x1F: return "nop"; case 0x2A: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "cvtsi2sd" : "cvtsi2ss"; case 0x51: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "sqrtsd" : "sqrtss"; case 0x58: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "addsd" : "addss"; case 0x59: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "mulsd" : "mulss"; case 0x5A: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "cvtsd2ss" : "cvtss2sd"; case 0x5D: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "minsd" : "minss"; case 0x5C: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "subsd" : "subss"; case 0x5E: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "divsd" : "divss"; case 0x5F: // F2/F3 prefix. return (group_1_prefix_ == 0xF2) ? "maxsd" : "maxss"; case 0xA2: return "cpuid"; case 0xA3: return "bt"; case 0xA5: return "shld"; case 0xAB: return "bts"; case 0xAD: return "shrd"; case 0xAF: return "imul"; case 0xB0: case 0xB1: return "cmpxchg"; case 0xB6: return "movzxb"; case 0xB7: return "movzxw"; case 0xBC: return "bsf"; case 0xBD: return "bsr"; case 0xBE: return "movsxb"; case 0xBF: return "movsxw"; default: return nullptr; } } // Disassembles the instruction at instr, and writes it into out_buffer. int DisassemblerX64::InstructionDecode(v8::internal::Vector<char> out_buffer, byte* instr) { tmp_buffer_pos_ = 0; // starting to write as position 0 byte* data = instr; bool processed = true; // Will be set to false if the current instruction // is not in 'instructions' table. byte current; // Scan for prefixes. while (true) { current = *data; if (current == OPERAND_SIZE_OVERRIDE_PREFIX) { // Group 3 prefix. operand_size_ = current; } else if ((current & 0xF0) == 0x40) { // REX prefix. setRex(current); if (rex_w()) AppendToBuffer("REX.W "); } else if ((current & 0xFE) == 0xF2) { // Group 1 prefix (0xF2 or 0xF3). group_1_prefix_ = current; } else if (current == LOCK_PREFIX) { AppendToBuffer("lock "); } else if (current == VEX3_PREFIX) { vex_byte0_ = current; vex_byte1_ = *(data + 1); vex_byte2_ = *(data + 2); setRex(0x40 | (~(vex_byte1_ >> 5) & 7) | ((vex_byte2_ >> 4) & 8)); data += 3; break; // Vex is the last prefix. } else if (current == VEX2_PREFIX) { vex_byte0_ = current; vex_byte1_ = *(data + 1); setRex(0x40 | (~(vex_byte1_ >> 5) & 4)); data += 2; break; // Vex is the last prefix. } else { // Not a prefix - an opcode. break; } data++; } // Decode AVX instructions. if (vex_byte0_ != 0) { processed = true; data += AVXInstruction(data); } else { const InstructionDesc& idesc = instruction_table_->Get(current); byte_size_operand_ = idesc.byte_size_operation; switch (idesc.type) { case ZERO_OPERANDS_INSTR: if (current >= 0xA4 && current <= 0xA7) { // String move or compare operations. if (group_1_prefix_ == REP_PREFIX) { // REP. AppendToBuffer("rep "); } if (rex_w()) AppendToBuffer("REX.W "); AppendToBuffer("%s%c", idesc.mnem, operand_size_code()); } else { AppendToBuffer("%s%c", idesc.mnem, operand_size_code()); } data++; break; case TWO_OPERANDS_INSTR: data++; data += PrintOperands(idesc.mnem, idesc.op_order_, data); break; case JUMP_CONDITIONAL_SHORT_INSTR: data += JumpConditionalShort(data); break; case REGISTER_INSTR: AppendToBuffer("%s%c %s", idesc.mnem, operand_size_code(), NameOfCPURegister(base_reg(current & 0x07))); data++; break; case PUSHPOP_INSTR: AppendToBuffer("%s %s", idesc.mnem, NameOfCPURegister(base_reg(current & 0x07))); data++; break; case MOVE_REG_INSTR: { byte* addr = nullptr; switch (operand_size()) { case OPERAND_WORD_SIZE: addr = reinterpret_cast<byte*>(*reinterpret_cast<int16_t*>(data + 1)); data += 3; break; case OPERAND_DOUBLEWORD_SIZE: addr = reinterpret_cast<byte*>(*reinterpret_cast<uint32_t*>(data + 1)); data += 5; break; case OPERAND_QUADWORD_SIZE: addr = reinterpret_cast<byte*>(*reinterpret_cast<int64_t*>(data + 1)); data += 9; break; default: UNREACHABLE(); } AppendToBuffer("mov%c %s,%s", operand_size_code(), NameOfCPURegister(base_reg(current & 0x07)), NameOfAddress(addr)); break; } case CALL_JUMP_INSTR: { byte* addr = data + *reinterpret_cast<int32_t*>(data + 1) + 5; AppendToBuffer("%s %s", idesc.mnem, NameOfAddress(addr)); data += 5; break; } case SHORT_IMMEDIATE_INSTR: { int32_t imm; if (operand_size() == OPERAND_WORD_SIZE) { imm = *reinterpret_cast<int16_t*>(data + 1); data += 3; } else { imm = *reinterpret_cast<int32_t*>(data + 1); data += 5; } AppendToBuffer("%s rax,0x%x", idesc.mnem, imm); break; } case NO_INSTR: processed = false; break; default: UNIMPLEMENTED(); // This type is not implemented. } } // The first byte didn't match any of the simple opcodes, so we // need to do special processing on it. if (!processed) { switch (*data) { case 0xC2: AppendToBuffer("ret 0x%x", *reinterpret_cast<uint16_t*>(data + 1)); data += 3; break; case 0x69: // fall through case 0x6B: { int count = 1; count += PrintOperands("imul", REG_OPER_OP_ORDER, data + count); AppendToBuffer(",0x"); if (*data == 0x69) { count += PrintImmediate(data + count, operand_size()); } else { count += PrintImmediate(data + count, OPERAND_BYTE_SIZE); } data += count; break; } case 0x81: // fall through case 0x83: // 0x81 with sign extension bit set data += PrintImmediateOp(data); break; case 0x0F: data += TwoByteOpcodeInstruction(data); break; case 0x8F: { data++; int mod, regop, rm; get_modrm(*data, &mod, ®op, &rm); if (regop == 0) { AppendToBuffer("pop "); data += PrintRightOperand(data); } } break; case 0xFF: { data++; int mod, regop, rm; get_modrm(*data, &mod, ®op, &rm); const char* mnem = nullptr; switch (regop) { case 0: mnem = "inc"; break; case 1: mnem = "dec"; break; case 2: mnem = "call"; break; case 4: mnem = "jmp"; break; case 6: mnem = "push"; break; default: mnem = "???"; } if (regop <= 1) { AppendToBuffer("%s%c ", mnem, operand_size_code()); } else { AppendToBuffer("%s ", mnem); } data += PrintRightOperand(data); } break; case 0xC7: // imm32, fall through case 0xC6: // imm8 { bool is_byte = *data == 0xC6; data++; if (is_byte) { AppendToBuffer("movb "); data += PrintRightByteOperand(data); int32_t imm = *data; AppendToBuffer(",0x%x", imm); data++; } else { AppendToBuffer("mov%c ", operand_size_code()); data += PrintRightOperand(data); if (operand_size() == OPERAND_WORD_SIZE) { int16_t imm = *reinterpret_cast<int16_t*>(data); AppendToBuffer(",0x%x", imm); data += 2; } else { int32_t imm = *reinterpret_cast<int32_t*>(data); AppendToBuffer(",0x%x", imm); data += 4; } } } break; case 0x80: { data++; AppendToBuffer("cmpb "); data += PrintRightByteOperand(data); int32_t imm = *data; AppendToBuffer(",0x%x", imm); data++; } break; case 0x88: // 8bit, fall through case 0x89: // 32bit { bool is_byte = *data == 0x88; int mod, regop, rm; data++; get_modrm(*data, &mod, ®op, &rm); if (is_byte) { AppendToBuffer("movb "); data += PrintRightByteOperand(data); AppendToBuffer(",%s", NameOfByteCPURegister(regop)); } else { AppendToBuffer("mov%c ", operand_size_code()); data += PrintRightOperand(data); AppendToBuffer(",%s", NameOfCPURegister(regop)); } } break; case 0x90: case 0x91: case 0x92: case 0x93: case 0x94: case 0x95: case 0x96: case 0x97: { int reg = (*data & 0x7) | (rex_b() ? 8 : 0); if (group_1_prefix_ == 0xF3 && *data == 0x90) { AppendToBuffer("pause"); } else if (reg == 0) { AppendToBuffer("nop"); // Common name for xchg rax,rax. } else { AppendToBuffer("xchg%c rax,%s", operand_size_code(), NameOfCPURegister(reg)); } data++; } break; case 0xB0: case 0xB1: case 0xB2: case 0xB3: case 0xB4: case 0xB5: case 0xB6: case 0xB7: case 0xB8: case 0xB9: case 0xBA: case 0xBB: case 0xBC: case 0xBD: case 0xBE: case 0xBF: { // mov reg8,imm8 or mov reg32,imm32 byte opcode = *data; data++; bool is_32bit = (opcode >= 0xB8); int reg = (opcode & 0x7) | (rex_b() ? 8 : 0); if (is_32bit) { AppendToBuffer("mov%c %s,", operand_size_code(), NameOfCPURegister(reg)); data += PrintImmediate(data, OPERAND_DOUBLEWORD_SIZE); } else { AppendToBuffer("movb %s,", NameOfByteCPURegister(reg)); data += PrintImmediate(data, OPERAND_BYTE_SIZE); } break; } case 0xFE: { data++; int mod, regop, rm; get_modrm(*data, &mod, ®op, &rm); if (regop == 1) { AppendToBuffer("decb "); data += PrintRightByteOperand(data); } else { UnimplementedInstruction(); } break; } case 0x68: AppendToBuffer("push 0x%x", *reinterpret_cast<int32_t*>(data + 1)); data += 5; break; case 0x6A: AppendToBuffer("push 0x%x", *reinterpret_cast<int8_t*>(data + 1)); data += 2; break; case 0xA1: // Fall through. case 0xA3: switch (operand_size()) { case OPERAND_DOUBLEWORD_SIZE: { const char* memory_location = NameOfAddress( reinterpret_cast<byte*>( *reinterpret_cast<int32_t*>(data + 1))); if (*data == 0xA1) { // Opcode 0xA1 AppendToBuffer("movzxlq rax,(%s)", memory_location); } else { // Opcode 0xA3 AppendToBuffer("movzxlq (%s),rax", memory_location); } data += 5; break; } case OPERAND_QUADWORD_SIZE: { // New x64 instruction mov rax,(imm_64). const char* memory_location = NameOfAddress( *reinterpret_cast<byte**>(data + 1)); if (*data == 0xA1) { // Opcode 0xA1 AppendToBuffer("movq rax,(%s)", memory_location); } else { // Opcode 0xA3 AppendToBuffer("movq (%s),rax", memory_location); } data += 9; break; } default: UnimplementedInstruction(); data += 2; } break; case 0xA8: AppendToBuffer("test al,0x%x", *reinterpret_cast<uint8_t*>(data + 1)); data += 2; break; case 0xA9: { int64_t value = 0; switch (operand_size()) { case OPERAND_WORD_SIZE: value = *reinterpret_cast<uint16_t*>(data + 1); data += 3; break; case OPERAND_DOUBLEWORD_SIZE: value = *reinterpret_cast<uint32_t*>(data + 1); data += 5; break; case OPERAND_QUADWORD_SIZE: value = *reinterpret_cast<int32_t*>(data + 1); data += 5; break; default: UNREACHABLE(); } AppendToBuffer("test%c rax,0x%" PRIx64, operand_size_code(), value); break; } case 0xD1: // fall through case 0xD3: // fall through case 0xC1: data += ShiftInstruction(data); break; case 0xD0: // fall through case 0xD2: // fall through case 0xC0: byte_size_operand_ = true; data += ShiftInstruction(data); break; case 0xD9: // fall through case 0xDA: // fall through case 0xDB: // fall through case 0xDC: // fall through case 0xDD: // fall through case 0xDE: // fall through case 0xDF: data += FPUInstruction(data); break; case 0xEB: data += JumpShort(data); break; case 0xF6: byte_size_operand_ = true; V8_FALLTHROUGH; case 0xF7: data += F6F7Instruction(data); break; case 0x3C: AppendToBuffer("cmp al,0x%x", *reinterpret_cast<int8_t*>(data + 1)); data +=2; break; default: UnimplementedInstruction(); data += 1; } } // !processed if (tmp_buffer_pos_ < sizeof tmp_buffer_) { tmp_buffer_[tmp_buffer_pos_] = '\0'; } int instr_len = static_cast<int>(data - instr); DCHECK_GT(instr_len, 0); // Ensure progress. int outp = 0; // Instruction bytes. for (byte* bp = instr; bp < data; bp++) { outp += v8::internal::SNPrintF(out_buffer + outp, "%02x", *bp); } for (int i = 6 - instr_len; i >= 0; i--) { outp += v8::internal::SNPrintF(out_buffer + outp, " "); } outp += v8::internal::SNPrintF(out_buffer + outp, " %s", tmp_buffer_.start()); return instr_len; } //------------------------------------------------------------------------------ static const char* const cpu_regs[16] = { "rax", "rcx", "rdx", "rbx", "rsp", "rbp", "rsi", "rdi", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" }; static const char* const byte_cpu_regs[16] = { "al", "cl", "dl", "bl", "spl", "bpl", "sil", "dil", "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l" }; static const char* const xmm_regs[16] = { "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15" }; const char* NameConverter::NameOfAddress(byte* addr) const { v8::internal::SNPrintF(tmp_buffer_, "%p", static_cast<void*>(addr)); return tmp_buffer_.start(); } const char* NameConverter::NameOfConstant(byte* addr) const { return NameOfAddress(addr); } const char* NameConverter::NameOfCPURegister(int reg) const { if (0 <= reg && reg < 16) return cpu_regs[reg]; return "noreg"; } const char* NameConverter::NameOfByteCPURegister(int reg) const { if (0 <= reg && reg < 16) return byte_cpu_regs[reg]; return "noreg"; } const char* NameConverter::NameOfXMMRegister(int reg) const { if (0 <= reg && reg < 16) return xmm_regs[reg]; return "noxmmreg"; } const char* NameConverter::NameInCode(byte* addr) const { // X64 does not embed debug strings at the moment. UNREACHABLE(); } //------------------------------------------------------------------------------ int Disassembler::InstructionDecode(v8::internal::Vector<char> buffer, byte* instruction) { DisassemblerX64 d(converter_, unimplemented_opcode_action()); return d.InstructionDecode(buffer, instruction); } // The X64 assembler does not use constant pools. int Disassembler::ConstantPoolSizeAt(byte* instruction) { return -1; } void Disassembler::Disassemble(FILE* f, byte* begin, byte* end, UnimplementedOpcodeAction unimplemented_action) { NameConverter converter; Disassembler d(converter, unimplemented_action); for (byte* pc = begin; pc < end;) { v8::internal::EmbeddedVector<char, 128> buffer; buffer[0] = '\0'; byte* prev_pc = pc; pc += d.InstructionDecode(buffer, pc); fprintf(f, "%p", static_cast<void*>(prev_pc)); fprintf(f, " "); for (byte* bp = prev_pc; bp < pc; bp++) { fprintf(f, "%02x", *bp); } for (int i = 6 - static_cast<int>(pc - prev_pc); i >= 0; i--) { fprintf(f, " "); } fprintf(f, " %s\n", buffer.start()); } } } // namespace disasm #endif // V8_TARGET_ARCH_X64