// Copyright 2012 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. // A Disassembler object is used to disassemble a block of code instruction by // instruction. The default implementation of the NameConverter object can be // overriden to modify register names or to do symbol lookup on addresses. // // The example below will disassemble a block of code and print it to stdout. // // NameConverter converter; // Disassembler d(converter); // for (byte* pc = begin; pc < end;) { // v8::internal::EmbeddedVector<char, 256> buffer; // byte* prev_pc = pc; // pc += d.InstructionDecode(buffer, pc); // printf("%p %08x %s\n", // prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer); // } // // The Disassembler class also has a convenience method to disassemble a block // of code into a FILE*, meaning that the above functionality could also be // achieved by just calling Disassembler::Disassemble(stdout, begin, end); #include <assert.h> #include <stdarg.h> #include <stdio.h> #include <string.h> #if V8_TARGET_ARCH_MIPS64 #include "src/base/platform/platform.h" #include "src/disasm.h" #include "src/macro-assembler.h" #include "src/mips64/constants-mips64.h" namespace v8 { namespace internal { //------------------------------------------------------------------------------ // Decoder decodes and disassembles instructions into an output buffer. // It uses the converter to convert register names and call destinations into // more informative description. class Decoder { public: Decoder(const disasm::NameConverter& converter, v8::internal::Vector<char> out_buffer) : converter_(converter), out_buffer_(out_buffer), out_buffer_pos_(0) { out_buffer_[out_buffer_pos_] = '\0'; } ~Decoder() {} // Writes one disassembled instruction into 'buffer' (0-terminated). // Returns the length of the disassembled machine instruction in bytes. int InstructionDecode(byte* instruction); private: // Bottleneck functions to print into the out_buffer. void PrintChar(const char ch); void Print(const char* str); // Printing of common values. void PrintRegister(int reg); void PrintFPURegister(int freg); void PrintFPUStatusRegister(int freg); void PrintRs(Instruction* instr); void PrintRt(Instruction* instr); void PrintRd(Instruction* instr); void PrintFs(Instruction* instr); void PrintFt(Instruction* instr); void PrintFd(Instruction* instr); void PrintSa(Instruction* instr); void PrintSd(Instruction* instr); void PrintSs1(Instruction* instr); void PrintSs2(Instruction* instr); void PrintBc(Instruction* instr); void PrintCc(Instruction* instr); void PrintFunction(Instruction* instr); void PrintSecondaryField(Instruction* instr); void PrintUImm16(Instruction* instr); void PrintSImm16(Instruction* instr); void PrintXImm16(Instruction* instr); void PrintPCImm16(Instruction* instr, int delta_pc, int n_bits); void PrintXImm18(Instruction* instr); void PrintSImm18(Instruction* instr); void PrintXImm19(Instruction* instr); void PrintSImm19(Instruction* instr); void PrintXImm21(Instruction* instr); void PrintPCImm21(Instruction* instr, int delta_pc, int n_bits); void PrintXImm26(Instruction* instr); void PrintSImm26(Instruction* instr); void PrintPCImm26(Instruction* instr, int delta_pc, int n_bits); void PrintPCImm26(Instruction* instr); void PrintCode(Instruction* instr); // For break and trap instructions. void PrintFormat(Instruction* instr); // For floating format postfix. void PrintBp2(Instruction* instr); void PrintBp3(Instruction* instr); // Printing of instruction name. void PrintInstructionName(Instruction* instr); // Handle formatting of instructions and their options. int FormatRegister(Instruction* instr, const char* option); int FormatFPURegister(Instruction* instr, const char* option); int FormatOption(Instruction* instr, const char* option); void Format(Instruction* instr, const char* format); void Unknown(Instruction* instr); int DecodeBreakInstr(Instruction* instr); // Each of these functions decodes one particular instruction type. bool DecodeTypeRegisterRsType(Instruction* instr); void DecodeTypeRegisterSRsType(Instruction* instr); void DecodeTypeRegisterDRsType(Instruction* instr); void DecodeTypeRegisterLRsType(Instruction* instr); void DecodeTypeRegisterWRsType(Instruction* instr); void DecodeTypeRegisterSPECIAL(Instruction* instr); void DecodeTypeRegisterSPECIAL2(Instruction* instr); void DecodeTypeRegisterSPECIAL3(Instruction* instr); void DecodeTypeRegisterCOP1(Instruction* instr); void DecodeTypeRegisterCOP1X(Instruction* instr); int DecodeTypeRegister(Instruction* instr); void DecodeTypeImmediateCOP1(Instruction* instr); void DecodeTypeImmediateREGIMM(Instruction* instr); void DecodeTypeImmediate(Instruction* instr); void DecodeTypeJump(Instruction* instr); const disasm::NameConverter& converter_; v8::internal::Vector<char> out_buffer_; int out_buffer_pos_; DISALLOW_COPY_AND_ASSIGN(Decoder); }; // Support for assertions in the Decoder formatting functions. #define STRING_STARTS_WITH(string, compare_string) \ (strncmp(string, compare_string, strlen(compare_string)) == 0) // Append the ch to the output buffer. void Decoder::PrintChar(const char ch) { out_buffer_[out_buffer_pos_++] = ch; } // Append the str to the output buffer. void Decoder::Print(const char* str) { char cur = *str++; while (cur != '\0' && (out_buffer_pos_ < (out_buffer_.length() - 1))) { PrintChar(cur); cur = *str++; } out_buffer_[out_buffer_pos_] = 0; } // Print the register name according to the active name converter. void Decoder::PrintRegister(int reg) { Print(converter_.NameOfCPURegister(reg)); } void Decoder::PrintRs(Instruction* instr) { int reg = instr->RsValue(); PrintRegister(reg); } void Decoder::PrintRt(Instruction* instr) { int reg = instr->RtValue(); PrintRegister(reg); } void Decoder::PrintRd(Instruction* instr) { int reg = instr->RdValue(); PrintRegister(reg); } // Print the FPUregister name according to the active name converter. void Decoder::PrintFPURegister(int freg) { Print(converter_.NameOfXMMRegister(freg)); } void Decoder::PrintFPUStatusRegister(int freg) { switch (freg) { case kFCSRRegister: Print("FCSR"); break; default: Print(converter_.NameOfXMMRegister(freg)); } } void Decoder::PrintFs(Instruction* instr) { int freg = instr->RsValue(); PrintFPURegister(freg); } void Decoder::PrintFt(Instruction* instr) { int freg = instr->RtValue(); PrintFPURegister(freg); } void Decoder::PrintFd(Instruction* instr) { int freg = instr->RdValue(); PrintFPURegister(freg); } // Print the integer value of the sa field. void Decoder::PrintSa(Instruction* instr) { int sa = instr->SaValue(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", sa); } // Print the integer value of the rd field, when it is not used as reg. void Decoder::PrintSd(Instruction* instr) { int sd = instr->RdValue(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", sd); } // Print the integer value of the rd field, when used as 'ext' size. void Decoder::PrintSs1(Instruction* instr) { int ss = instr->RdValue(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", ss + 1); } // Print the integer value of the rd field, when used as 'ins' size. void Decoder::PrintSs2(Instruction* instr) { int ss = instr->RdValue(); int pos = instr->SaValue(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", ss - pos + 1); } // Print the integer value of the cc field for the bc1t/f instructions. void Decoder::PrintBc(Instruction* instr) { int cc = instr->FBccValue(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", cc); } // Print the integer value of the cc field for the FP compare instructions. void Decoder::PrintCc(Instruction* instr) { int cc = instr->FCccValue(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "cc(%d)", cc); } // Print 16-bit unsigned immediate value. void Decoder::PrintUImm16(Instruction* instr) { int32_t imm = instr->Imm16Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%u", imm); } // Print 16-bit signed immediate value. void Decoder::PrintSImm16(Instruction* instr) { int32_t imm = ((instr->Imm16Value()) << (32 - kImm16Bits)) >> (32 - kImm16Bits); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm); } // Print 16-bit hexa immediate value. void Decoder::PrintXImm16(Instruction* instr) { int32_t imm = instr->Imm16Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm); } // Print absoulte address for 16-bit offset or immediate value. // The absolute address is calculated according following expression: // PC + delta_pc + (offset << n_bits) void Decoder::PrintPCImm16(Instruction* instr, int delta_pc, int n_bits) { int16_t offset = instr->Imm16Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%s", converter_.NameOfAddress(reinterpret_cast<byte*>(instr) + delta_pc + (offset << n_bits))); } // Print 18-bit signed immediate value. void Decoder::PrintSImm18(Instruction* instr) { int32_t imm = ((instr->Imm18Value()) << (32 - kImm18Bits)) >> (32 - kImm18Bits); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm); } // Print 18-bit hexa immediate value. void Decoder::PrintXImm18(Instruction* instr) { int32_t imm = instr->Imm18Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm); } // Print 19-bit hexa immediate value. void Decoder::PrintXImm19(Instruction* instr) { int32_t imm = instr->Imm19Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm); } // Print 19-bit signed immediate value. void Decoder::PrintSImm19(Instruction* instr) { int32_t imm19 = instr->Imm19Value(); // set sign imm19 <<= (32 - kImm19Bits); imm19 >>= (32 - kImm19Bits); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm19); } // Print 21-bit immediate value. void Decoder::PrintXImm21(Instruction* instr) { uint32_t imm = instr->Imm21Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm); } // Print absoulte address for 21-bit offset or immediate value. // The absolute address is calculated according following expression: // PC + delta_pc + (offset << n_bits) void Decoder::PrintPCImm21(Instruction* instr, int delta_pc, int n_bits) { int32_t imm21 = instr->Imm21Value(); // set sign imm21 <<= (32 - kImm21Bits); imm21 >>= (32 - kImm21Bits); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%s", converter_.NameOfAddress(reinterpret_cast<byte*>(instr) + delta_pc + (imm21 << n_bits))); } // Print 26-bit hex immediate value. void Decoder::PrintXImm26(Instruction* instr) { uint64_t target = static_cast<uint64_t>(instr->Imm26Value()) << kImmFieldShift; target = (reinterpret_cast<uint64_t>(instr) & ~0xfffffff) | target; out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%lx", target); } // Print 26-bit signed immediate value. void Decoder::PrintSImm26(Instruction* instr) { int32_t imm26 = instr->Imm26Value(); // set sign imm26 <<= (32 - kImm26Bits); imm26 >>= (32 - kImm26Bits); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm26); } // Print absoulte address for 26-bit offset or immediate value. // The absolute address is calculated according following expression: // PC + delta_pc + (offset << n_bits) void Decoder::PrintPCImm26(Instruction* instr, int delta_pc, int n_bits) { int32_t imm26 = instr->Imm26Value(); // set sign imm26 <<= (32 - kImm26Bits); imm26 >>= (32 - kImm26Bits); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%s", converter_.NameOfAddress(reinterpret_cast<byte*>(instr) + delta_pc + (imm26 << n_bits))); } // Print absoulte address for 26-bit offset or immediate value. // The absolute address is calculated according following expression: // PC[GPRLEN-1 .. 28] || instr_index26 || 00 void Decoder::PrintPCImm26(Instruction* instr) { int32_t imm26 = instr->Imm26Value(); uint64_t pc_mask = ~0xfffffff; uint64_t pc = ((uint64_t)(instr + 1) & pc_mask) | (imm26 << 2); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%s", converter_.NameOfAddress((reinterpret_cast<byte*>(pc)))); } void Decoder::PrintBp2(Instruction* instr) { int bp2 = instr->Bp2Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", bp2); } void Decoder::PrintBp3(Instruction* instr) { int bp3 = instr->Bp3Value(); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", bp3); } // Print 26-bit immediate value. void Decoder::PrintCode(Instruction* instr) { if (instr->OpcodeFieldRaw() != SPECIAL) return; // Not a break or trap instruction. switch (instr->FunctionFieldRaw()) { case BREAK: { int32_t code = instr->Bits(25, 6); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%05x (%d)", code, code); break; } case TGE: case TGEU: case TLT: case TLTU: case TEQ: case TNE: { int32_t code = instr->Bits(15, 6); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%03x", code); break; } default: // Not a break or trap instruction. break; } } void Decoder::PrintFormat(Instruction* instr) { char formatLetter = ' '; switch (instr->RsFieldRaw()) { case S: formatLetter = 's'; break; case D: formatLetter = 'd'; break; case W: formatLetter = 'w'; break; case L: formatLetter = 'l'; break; default: UNREACHABLE(); break; } PrintChar(formatLetter); } // Printing of instruction name. void Decoder::PrintInstructionName(Instruction* instr) { } // Handle all register based formatting in this function to reduce the // complexity of FormatOption. int Decoder::FormatRegister(Instruction* instr, const char* format) { DCHECK(format[0] == 'r'); if (format[1] == 's') { // 'rs: Rs register. int reg = instr->RsValue(); PrintRegister(reg); return 2; } else if (format[1] == 't') { // 'rt: rt register. int reg = instr->RtValue(); PrintRegister(reg); return 2; } else if (format[1] == 'd') { // 'rd: rd register. int reg = instr->RdValue(); PrintRegister(reg); return 2; } UNREACHABLE(); return -1; } // Handle all FPUregister based formatting in this function to reduce the // complexity of FormatOption. int Decoder::FormatFPURegister(Instruction* instr, const char* format) { DCHECK(format[0] == 'f'); if ((CTC1 == instr->RsFieldRaw()) || (CFC1 == instr->RsFieldRaw())) { if (format[1] == 's') { // 'fs: fs register. int reg = instr->FsValue(); PrintFPUStatusRegister(reg); return 2; } else if (format[1] == 't') { // 'ft: ft register. int reg = instr->FtValue(); PrintFPUStatusRegister(reg); return 2; } else if (format[1] == 'd') { // 'fd: fd register. int reg = instr->FdValue(); PrintFPUStatusRegister(reg); return 2; } else if (format[1] == 'r') { // 'fr: fr register. int reg = instr->FrValue(); PrintFPUStatusRegister(reg); return 2; } } else { if (format[1] == 's') { // 'fs: fs register. int reg = instr->FsValue(); PrintFPURegister(reg); return 2; } else if (format[1] == 't') { // 'ft: ft register. int reg = instr->FtValue(); PrintFPURegister(reg); return 2; } else if (format[1] == 'd') { // 'fd: fd register. int reg = instr->FdValue(); PrintFPURegister(reg); return 2; } else if (format[1] == 'r') { // 'fr: fr register. int reg = instr->FrValue(); PrintFPURegister(reg); return 2; } } UNREACHABLE(); return -1; } // FormatOption takes a formatting string and interprets it based on // the current instructions. The format string points to the first // character of the option string (the option escape has already been // consumed by the caller.) FormatOption returns the number of // characters that were consumed from the formatting string. int Decoder::FormatOption(Instruction* instr, const char* format) { switch (format[0]) { case 'c': { // 'code for break or trap instructions. DCHECK(STRING_STARTS_WITH(format, "code")); PrintCode(instr); return 4; } case 'i': { // 'imm16u or 'imm26. if (format[3] == '1') { if (format[4] == '6') { DCHECK(STRING_STARTS_WITH(format, "imm16")); switch (format[5]) { case 's': DCHECK(STRING_STARTS_WITH(format, "imm16s")); PrintSImm16(instr); break; case 'u': DCHECK(STRING_STARTS_WITH(format, "imm16u")); PrintSImm16(instr); break; case 'x': DCHECK(STRING_STARTS_WITH(format, "imm16x")); PrintXImm16(instr); break; case 'p': { // The PC relative address. DCHECK(STRING_STARTS_WITH(format, "imm16p")); int delta_pc = 0; int n_bits = 0; switch (format[6]) { case '4': { DCHECK(STRING_STARTS_WITH(format, "imm16p4")); delta_pc = 4; switch (format[8]) { case '2': DCHECK(STRING_STARTS_WITH(format, "imm16p4s2")); n_bits = 2; PrintPCImm16(instr, delta_pc, n_bits); return 9; } } } } } return 6; } else if (format[4] == '8') { DCHECK(STRING_STARTS_WITH(format, "imm18")); switch (format[5]) { case 's': DCHECK(STRING_STARTS_WITH(format, "imm18s")); PrintSImm18(instr); break; case 'x': DCHECK(STRING_STARTS_WITH(format, "imm18x")); PrintXImm18(instr); break; } return 6; } else if (format[4] == '9') { DCHECK(STRING_STARTS_WITH(format, "imm19")); switch (format[5]) { case 's': DCHECK(STRING_STARTS_WITH(format, "imm19s")); PrintSImm19(instr); break; case 'x': DCHECK(STRING_STARTS_WITH(format, "imm19x")); PrintXImm19(instr); break; } return 6; } } else if (format[3] == '2' && format[4] == '1') { DCHECK(STRING_STARTS_WITH(format, "imm21")); switch (format[5]) { case 'x': DCHECK(STRING_STARTS_WITH(format, "imm21x")); PrintXImm21(instr); break; case 'p': { // The PC relative address. DCHECK(STRING_STARTS_WITH(format, "imm21p")); int delta_pc = 0; int n_bits = 0; switch (format[6]) { case '4': { DCHECK(STRING_STARTS_WITH(format, "imm21p4")); delta_pc = 4; switch (format[8]) { case '2': DCHECK(STRING_STARTS_WITH(format, "imm21p4s2")); n_bits = 2; PrintPCImm21(instr, delta_pc, n_bits); return 9; } } } } } return 6; } else if (format[3] == '2' && format[4] == '6') { DCHECK(STRING_STARTS_WITH(format, "imm26")); switch (format[5]) { case 's': DCHECK(STRING_STARTS_WITH(format, "imm26s")); PrintSImm26(instr); break; case 'x': DCHECK(STRING_STARTS_WITH(format, "imm26x")); PrintXImm26(instr); break; case 'p': { // The PC relative address. DCHECK(STRING_STARTS_WITH(format, "imm26p")); int delta_pc = 0; int n_bits = 0; switch (format[6]) { case '4': { DCHECK(STRING_STARTS_WITH(format, "imm26p4")); delta_pc = 4; switch (format[8]) { case '2': DCHECK(STRING_STARTS_WITH(format, "imm26p4s2")); n_bits = 2; PrintPCImm26(instr, delta_pc, n_bits); return 9; } } } } case 'j': { // Absolute address for jump instructions. DCHECK(STRING_STARTS_WITH(format, "imm26j")); PrintPCImm26(instr); break; } } return 6; } } case 'r': { // 'r: registers. return FormatRegister(instr, format); } case 'f': { // 'f: FPUregisters. return FormatFPURegister(instr, format); } case 's': { // 'sa. switch (format[1]) { case 'a': { DCHECK(STRING_STARTS_WITH(format, "sa")); PrintSa(instr); return 2; } case 'd': { DCHECK(STRING_STARTS_WITH(format, "sd")); PrintSd(instr); return 2; } case 's': { if (format[2] == '1') { DCHECK(STRING_STARTS_WITH(format, "ss1")); /* ext size */ PrintSs1(instr); return 3; } else { DCHECK(STRING_STARTS_WITH(format, "ss2")); /* ins size */ PrintSs2(instr); return 3; } } } } case 'b': { switch (format[1]) { case 'c': { // 'bc - Special for bc1 cc field. DCHECK(STRING_STARTS_WITH(format, "bc")); PrintBc(instr); return 2; } case 'p': { switch (format[2]) { case '2': { // 'bp2 DCHECK(STRING_STARTS_WITH(format, "bp2")); PrintBp2(instr); return 3; } case '3': { // 'bp3 DCHECK(STRING_STARTS_WITH(format, "bp3")); PrintBp3(instr); return 3; } } } } } case 'C': { // 'Cc - Special for c.xx.d cc field. DCHECK(STRING_STARTS_WITH(format, "Cc")); PrintCc(instr); return 2; } case 't': PrintFormat(instr); return 1; } UNREACHABLE(); return -1; } // Format takes a formatting string for a whole instruction and prints it into // the output buffer. All escaped options are handed to FormatOption to be // parsed further. void Decoder::Format(Instruction* instr, const char* format) { char cur = *format++; while ((cur != 0) && (out_buffer_pos_ < (out_buffer_.length() - 1))) { if (cur == '\'') { // Single quote is used as the formatting escape. format += FormatOption(instr, format); } else { out_buffer_[out_buffer_pos_++] = cur; } cur = *format++; } out_buffer_[out_buffer_pos_] = '\0'; } // For currently unimplemented decodings the disassembler calls Unknown(instr) // which will just print "unknown" of the instruction bits. void Decoder::Unknown(Instruction* instr) { Format(instr, "unknown"); } int Decoder::DecodeBreakInstr(Instruction* instr) { // This is already known to be BREAK instr, just extract the code. if (instr->Bits(25, 6) == static_cast<int>(kMaxStopCode)) { // This is stop(msg). Format(instr, "break, code: 'code"); out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "\n%p %08lx stop msg: %s", static_cast<void*> (reinterpret_cast<int32_t*>(instr + Instruction::kInstrSize)), reinterpret_cast<uint64_t> (*reinterpret_cast<char**>(instr + Instruction::kInstrSize)), *reinterpret_cast<char**>(instr + Instruction::kInstrSize)); // Size 3: the break_ instr, plus embedded 64-bit char pointer. return 3 * Instruction::kInstrSize; } else { Format(instr, "break, code: 'code"); return Instruction::kInstrSize; } } bool Decoder::DecodeTypeRegisterRsType(Instruction* instr) { switch (instr->FunctionFieldRaw()) { case RINT: Format(instr, "rint.'t 'fd, 'fs"); break; case SEL: Format(instr, "sel.'t 'fd, 'fs, 'ft"); break; case SELEQZ_C: Format(instr, "seleqz.'t 'fd, 'fs, 'ft"); break; case SELNEZ_C: Format(instr, "selnez.'t 'fd, 'fs, 'ft"); break; case MOVZ_C: Format(instr, "movz.'t 'fd, 'fs, 'rt"); break; case MOVN_C: Format(instr, "movn.'t 'fd, 'fs, 'rt"); break; case MOVF: if (instr->Bit(16)) { Format(instr, "movt.'t 'fd, 'fs, 'Cc"); } else { Format(instr, "movf.'t 'fd, 'fs, 'Cc"); } break; case MIN: Format(instr, "min.'t 'fd, 'fs, 'ft"); break; case MAX: Format(instr, "max.'t 'fd, 'fs, 'ft"); break; case MINA: Format(instr, "mina.'t 'fd, 'fs, 'ft"); break; case MAXA: Format(instr, "maxa.'t 'fd, 'fs, 'ft"); break; case ADD_D: Format(instr, "add.'t 'fd, 'fs, 'ft"); break; case SUB_D: Format(instr, "sub.'t 'fd, 'fs, 'ft"); break; case MUL_D: Format(instr, "mul.'t 'fd, 'fs, 'ft"); break; case DIV_D: Format(instr, "div.'t 'fd, 'fs, 'ft"); break; case ABS_D: Format(instr, "abs.'t 'fd, 'fs"); break; case MOV_D: Format(instr, "mov.'t 'fd, 'fs"); break; case NEG_D: Format(instr, "neg.'t 'fd, 'fs"); break; case SQRT_D: Format(instr, "sqrt.'t 'fd, 'fs"); break; case RECIP_D: Format(instr, "recip.'t 'fd, 'fs"); break; case RSQRT_D: Format(instr, "rsqrt.'t 'fd, 'fs"); break; case CVT_W_D: Format(instr, "cvt.w.'t 'fd, 'fs"); break; case CVT_L_D: Format(instr, "cvt.l.'t 'fd, 'fs"); break; case TRUNC_W_D: Format(instr, "trunc.w.'t 'fd, 'fs"); break; case TRUNC_L_D: Format(instr, "trunc.l.'t 'fd, 'fs"); break; case ROUND_W_D: Format(instr, "round.w.'t 'fd, 'fs"); break; case ROUND_L_D: Format(instr, "round.l.'t 'fd, 'fs"); break; case FLOOR_W_D: Format(instr, "floor.w.'t 'fd, 'fs"); break; case FLOOR_L_D: Format(instr, "floor.l.'t 'fd, 'fs"); break; case CEIL_W_D: Format(instr, "ceil.w.'t 'fd, 'fs"); break; case CEIL_L_D: Format(instr, "ceil.l.'t 'fd, 'fs"); break; case CLASS_D: Format(instr, "class.'t 'fd, 'fs"); break; case CVT_S_D: Format(instr, "cvt.s.'t 'fd, 'fs"); break; case C_F_D: Format(instr, "c.f.'t 'fs, 'ft, 'Cc"); break; case C_UN_D: Format(instr, "c.un.'t 'fs, 'ft, 'Cc"); break; case C_EQ_D: Format(instr, "c.eq.'t 'fs, 'ft, 'Cc"); break; case C_UEQ_D: Format(instr, "c.ueq.'t 'fs, 'ft, 'Cc"); break; case C_OLT_D: Format(instr, "c.olt.'t 'fs, 'ft, 'Cc"); break; case C_ULT_D: Format(instr, "c.ult.'t 'fs, 'ft, 'Cc"); break; case C_OLE_D: Format(instr, "c.ole.'t 'fs, 'ft, 'Cc"); break; case C_ULE_D: Format(instr, "c.ule.'t 'fs, 'ft, 'Cc"); break; default: return false; } return true; } void Decoder::DecodeTypeRegisterSRsType(Instruction* instr) { if (!DecodeTypeRegisterRsType(instr)) { switch (instr->FunctionFieldRaw()) { case CVT_D_S: Format(instr, "cvt.d.'t 'fd, 'fs"); break; default: Format(instr, "unknown.cop1.'t"); break; } } } void Decoder::DecodeTypeRegisterDRsType(Instruction* instr) { if (!DecodeTypeRegisterRsType(instr)) { Format(instr, "unknown.cop1.'t"); } } void Decoder::DecodeTypeRegisterLRsType(Instruction* instr) { switch (instr->FunctionFieldRaw()) { case CVT_D_L: Format(instr, "cvt.d.l 'fd, 'fs"); break; case CVT_S_L: Format(instr, "cvt.s.l 'fd, 'fs"); break; case CMP_AF: Format(instr, "cmp.af.d 'fd, 'fs, 'ft"); break; case CMP_UN: Format(instr, "cmp.un.d 'fd, 'fs, 'ft"); break; case CMP_EQ: Format(instr, "cmp.eq.d 'fd, 'fs, 'ft"); break; case CMP_UEQ: Format(instr, "cmp.ueq.d 'fd, 'fs, 'ft"); break; case CMP_LT: Format(instr, "cmp.lt.d 'fd, 'fs, 'ft"); break; case CMP_ULT: Format(instr, "cmp.ult.d 'fd, 'fs, 'ft"); break; case CMP_LE: Format(instr, "cmp.le.d 'fd, 'fs, 'ft"); break; case CMP_ULE: Format(instr, "cmp.ule.d 'fd, 'fs, 'ft"); break; case CMP_OR: Format(instr, "cmp.or.d 'fd, 'fs, 'ft"); break; case CMP_UNE: Format(instr, "cmp.une.d 'fd, 'fs, 'ft"); break; case CMP_NE: Format(instr, "cmp.ne.d 'fd, 'fs, 'ft"); break; default: UNREACHABLE(); } } void Decoder::DecodeTypeRegisterWRsType(Instruction* instr) { switch (instr->FunctionValue()) { case CVT_S_W: // Convert word to float (single). Format(instr, "cvt.s.w 'fd, 'fs"); break; case CVT_D_W: // Convert word to double. Format(instr, "cvt.d.w 'fd, 'fs"); break; case CMP_AF: Format(instr, "cmp.af.s 'fd, 'fs, 'ft"); break; case CMP_UN: Format(instr, "cmp.un.s 'fd, 'fs, 'ft"); break; case CMP_EQ: Format(instr, "cmp.eq.s 'fd, 'fs, 'ft"); break; case CMP_UEQ: Format(instr, "cmp.ueq.s 'fd, 'fs, 'ft"); break; case CMP_LT: Format(instr, "cmp.lt.s 'fd, 'fs, 'ft"); break; case CMP_ULT: Format(instr, "cmp.ult.s 'fd, 'fs, 'ft"); break; case CMP_LE: Format(instr, "cmp.le.s 'fd, 'fs, 'ft"); break; case CMP_ULE: Format(instr, "cmp.ule.s 'fd, 'fs, 'ft"); break; case CMP_OR: Format(instr, "cmp.or.s 'fd, 'fs, 'ft"); break; case CMP_UNE: Format(instr, "cmp.une.s 'fd, 'fs, 'ft"); break; case CMP_NE: Format(instr, "cmp.ne.s 'fd, 'fs, 'ft"); break; default: UNREACHABLE(); } } void Decoder::DecodeTypeRegisterCOP1(Instruction* instr) { switch (instr->RsFieldRaw()) { case MFC1: Format(instr, "mfc1 'rt, 'fs"); break; case DMFC1: Format(instr, "dmfc1 'rt, 'fs"); break; case MFHC1: Format(instr, "mfhc1 'rt, 'fs"); break; case MTC1: Format(instr, "mtc1 'rt, 'fs"); break; case DMTC1: Format(instr, "dmtc1 'rt, 'fs"); break; // These are called "fs" too, although they are not FPU registers. case CTC1: Format(instr, "ctc1 'rt, 'fs"); break; case CFC1: Format(instr, "cfc1 'rt, 'fs"); break; case MTHC1: Format(instr, "mthc1 'rt, 'fs"); break; case S: DecodeTypeRegisterSRsType(instr); break; case D: DecodeTypeRegisterDRsType(instr); break; case W: DecodeTypeRegisterWRsType(instr); break; case L: DecodeTypeRegisterLRsType(instr); break; default: UNREACHABLE(); } } void Decoder::DecodeTypeRegisterCOP1X(Instruction* instr) { switch (instr->FunctionFieldRaw()) { case MADD_D: Format(instr, "madd.d 'fd, 'fr, 'fs, 'ft"); break; default: UNREACHABLE(); } } void Decoder::DecodeTypeRegisterSPECIAL(Instruction* instr) { switch (instr->FunctionFieldRaw()) { case JR: Format(instr, "jr 'rs"); break; case JALR: Format(instr, "jalr 'rs, 'rd"); break; case SLL: if (0x0 == static_cast<int>(instr->InstructionBits())) Format(instr, "nop"); else Format(instr, "sll 'rd, 'rt, 'sa"); break; case DSLL: Format(instr, "dsll 'rd, 'rt, 'sa"); break; case D_MUL_MUH: // Equals to DMUL. if (kArchVariant != kMips64r6) { Format(instr, "dmult 'rs, 'rt"); } else { if (instr->SaValue() == MUL_OP) { Format(instr, "dmul 'rd, 'rs, 'rt"); } else { Format(instr, "dmuh 'rd, 'rs, 'rt"); } } break; case DSLL32: Format(instr, "dsll32 'rd, 'rt, 'sa"); break; case SRL: if (instr->RsValue() == 0) { Format(instr, "srl 'rd, 'rt, 'sa"); } else { if (kArchVariant == kMips64r2) { Format(instr, "rotr 'rd, 'rt, 'sa"); } else { Unknown(instr); } } break; case DSRL: if (instr->RsValue() == 0) { Format(instr, "dsrl 'rd, 'rt, 'sa"); } else { if (kArchVariant == kMips64r2) { Format(instr, "drotr 'rd, 'rt, 'sa"); } else { Unknown(instr); } } break; case DSRL32: Format(instr, "dsrl32 'rd, 'rt, 'sa"); break; case SRA: Format(instr, "sra 'rd, 'rt, 'sa"); break; case DSRA: Format(instr, "dsra 'rd, 'rt, 'sa"); break; case DSRA32: Format(instr, "dsra32 'rd, 'rt, 'sa"); break; case SLLV: Format(instr, "sllv 'rd, 'rt, 'rs"); break; case DSLLV: Format(instr, "dsllv 'rd, 'rt, 'rs"); break; case SRLV: if (instr->SaValue() == 0) { Format(instr, "srlv 'rd, 'rt, 'rs"); } else { if (kArchVariant == kMips64r2) { Format(instr, "rotrv 'rd, 'rt, 'rs"); } else { Unknown(instr); } } break; case DSRLV: if (instr->SaValue() == 0) { Format(instr, "dsrlv 'rd, 'rt, 'rs"); } else { if (kArchVariant == kMips64r2) { Format(instr, "drotrv 'rd, 'rt, 'rs"); } else { Unknown(instr); } } break; case SRAV: Format(instr, "srav 'rd, 'rt, 'rs"); break; case DSRAV: Format(instr, "dsrav 'rd, 'rt, 'rs"); break; case MFHI: if (instr->Bits(25, 16) == 0) { Format(instr, "mfhi 'rd"); } else { if ((instr->FunctionFieldRaw() == CLZ_R6) && (instr->FdValue() == 1)) { Format(instr, "clz 'rd, 'rs"); } else if ((instr->FunctionFieldRaw() == CLO_R6) && (instr->FdValue() == 1)) { Format(instr, "clo 'rd, 'rs"); } } break; case MFLO: if (instr->Bits(25, 16) == 0) { Format(instr, "mflo 'rd"); } else { if ((instr->FunctionFieldRaw() == DCLZ_R6) && (instr->FdValue() == 1)) { Format(instr, "dclz 'rd, 'rs"); } else if ((instr->FunctionFieldRaw() == DCLO_R6) && (instr->FdValue() == 1)) { Format(instr, "dclo 'rd, 'rs"); } } break; case D_MUL_MUH_U: // Equals to DMULTU. if (kArchVariant != kMips64r6) { Format(instr, "dmultu 'rs, 'rt"); } else { if (instr->SaValue() == MUL_OP) { Format(instr, "dmulu 'rd, 'rs, 'rt"); } else { Format(instr, "dmuhu 'rd, 'rs, 'rt"); } } break; case MULT: // @Mips64r6 == MUL_MUH. if (kArchVariant != kMips64r6) { Format(instr, "mult 'rs, 'rt"); } else { if (instr->SaValue() == MUL_OP) { Format(instr, "mul 'rd, 'rs, 'rt"); } else { Format(instr, "muh 'rd, 'rs, 'rt"); } } break; case MULTU: // @Mips64r6 == MUL_MUH_U. if (kArchVariant != kMips64r6) { Format(instr, "multu 'rs, 'rt"); } else { if (instr->SaValue() == MUL_OP) { Format(instr, "mulu 'rd, 'rs, 'rt"); } else { Format(instr, "muhu 'rd, 'rs, 'rt"); } } break; case DIV: // @Mips64r6 == DIV_MOD. if (kArchVariant != kMips64r6) { Format(instr, "div 'rs, 'rt"); } else { if (instr->SaValue() == DIV_OP) { Format(instr, "div 'rd, 'rs, 'rt"); } else { Format(instr, "mod 'rd, 'rs, 'rt"); } } break; case DDIV: // @Mips64r6 == D_DIV_MOD. if (kArchVariant != kMips64r6) { Format(instr, "ddiv 'rs, 'rt"); } else { if (instr->SaValue() == DIV_OP) { Format(instr, "ddiv 'rd, 'rs, 'rt"); } else { Format(instr, "dmod 'rd, 'rs, 'rt"); } } break; case DIVU: // @Mips64r6 == DIV_MOD_U. if (kArchVariant != kMips64r6) { Format(instr, "divu 'rs, 'rt"); } else { if (instr->SaValue() == DIV_OP) { Format(instr, "divu 'rd, 'rs, 'rt"); } else { Format(instr, "modu 'rd, 'rs, 'rt"); } } break; case DDIVU: // @Mips64r6 == D_DIV_MOD_U. if (kArchVariant != kMips64r6) { Format(instr, "ddivu 'rs, 'rt"); } else { if (instr->SaValue() == DIV_OP) { Format(instr, "ddivu 'rd, 'rs, 'rt"); } else { Format(instr, "dmodu 'rd, 'rs, 'rt"); } } break; case ADD: Format(instr, "add 'rd, 'rs, 'rt"); break; case DADD: Format(instr, "dadd 'rd, 'rs, 'rt"); break; case ADDU: Format(instr, "addu 'rd, 'rs, 'rt"); break; case DADDU: Format(instr, "daddu 'rd, 'rs, 'rt"); break; case SUB: Format(instr, "sub 'rd, 'rs, 'rt"); break; case DSUB: Format(instr, "dsub 'rd, 'rs, 'rt"); break; case SUBU: Format(instr, "subu 'rd, 'rs, 'rt"); break; case DSUBU: Format(instr, "dsubu 'rd, 'rs, 'rt"); break; case AND: Format(instr, "and 'rd, 'rs, 'rt"); break; case OR: if (0 == instr->RsValue()) { Format(instr, "mov 'rd, 'rt"); } else if (0 == instr->RtValue()) { Format(instr, "mov 'rd, 'rs"); } else { Format(instr, "or 'rd, 'rs, 'rt"); } break; case XOR: Format(instr, "xor 'rd, 'rs, 'rt"); break; case NOR: Format(instr, "nor 'rd, 'rs, 'rt"); break; case SLT: Format(instr, "slt 'rd, 'rs, 'rt"); break; case SLTU: Format(instr, "sltu 'rd, 'rs, 'rt"); break; case TGE: Format(instr, "tge 'rs, 'rt, code: 'code"); break; case TGEU: Format(instr, "tgeu 'rs, 'rt, code: 'code"); break; case TLT: Format(instr, "tlt 'rs, 'rt, code: 'code"); break; case TLTU: Format(instr, "tltu 'rs, 'rt, code: 'code"); break; case TEQ: Format(instr, "teq 'rs, 'rt, code: 'code"); break; case TNE: Format(instr, "tne 'rs, 'rt, code: 'code"); break; case MOVZ: Format(instr, "movz 'rd, 'rs, 'rt"); break; case MOVN: Format(instr, "movn 'rd, 'rs, 'rt"); break; case MOVCI: if (instr->Bit(16)) { Format(instr, "movt 'rd, 'rs, 'bc"); } else { Format(instr, "movf 'rd, 'rs, 'bc"); } break; case SELEQZ_S: Format(instr, "seleqz 'rd, 'rs, 'rt"); break; case SELNEZ_S: Format(instr, "selnez 'rd, 'rs, 'rt"); break; default: UNREACHABLE(); } } void Decoder::DecodeTypeRegisterSPECIAL2(Instruction* instr) { switch (instr->FunctionFieldRaw()) { case MUL: Format(instr, "mul 'rd, 'rs, 'rt"); break; case CLZ: if (kArchVariant != kMips64r6) { Format(instr, "clz 'rd, 'rs"); } break; case DCLZ: if (kArchVariant != kMips64r6) { Format(instr, "dclz 'rd, 'rs"); } break; default: UNREACHABLE(); } } void Decoder::DecodeTypeRegisterSPECIAL3(Instruction* instr) { switch (instr->FunctionFieldRaw()) { case INS: { Format(instr, "ins 'rt, 'rs, 'sa, 'ss2"); break; } case EXT: { Format(instr, "ext 'rt, 'rs, 'sa, 'ss1"); break; } case DEXT: { Format(instr, "dext 'rt, 'rs, 'sa, 'ss1"); break; } case BSHFL: { int sa = instr->SaFieldRaw() >> kSaShift; switch (sa) { case BITSWAP: { Format(instr, "bitswap 'rd, 'rt"); break; } case SEB: case SEH: case WSBH: UNREACHABLE(); break; default: { sa >>= kBp2Bits; switch (sa) { case ALIGN: { Format(instr, "align 'rd, 'rs, 'rt, 'bp2"); break; } default: UNREACHABLE(); break; } break; } } break; } case DBSHFL: { int sa = instr->SaFieldRaw() >> kSaShift; switch (sa) { case DBITSWAP: { switch (instr->SaFieldRaw() >> kSaShift) { case DBITSWAP_SA: Format(instr, "dbitswap 'rd, 'rt"); break; default: UNREACHABLE(); break; } break; } case DSBH: case DSHD: UNREACHABLE(); break; default: { sa >>= kBp3Bits; switch (sa) { case DALIGN: { Format(instr, "dalign 'rd, 'rs, 'rt, 'bp3"); break; } default: UNREACHABLE(); break; } break; } } break; } default: UNREACHABLE(); } } int Decoder::DecodeTypeRegister(Instruction* instr) { switch (instr->OpcodeFieldRaw()) { case COP1: // Coprocessor instructions. DecodeTypeRegisterCOP1(instr); break; case COP1X: DecodeTypeRegisterCOP1X(instr); break; case SPECIAL: switch (instr->FunctionFieldRaw()) { case BREAK: return DecodeBreakInstr(instr); default: DecodeTypeRegisterSPECIAL(instr); break; } break; case SPECIAL2: DecodeTypeRegisterSPECIAL2(instr); break; case SPECIAL3: DecodeTypeRegisterSPECIAL3(instr); break; default: UNREACHABLE(); } return Instruction::kInstrSize; } void Decoder::DecodeTypeImmediateCOP1(Instruction* instr) { switch (instr->RsFieldRaw()) { case BC1: if (instr->FBtrueValue()) { Format(instr, "bc1t 'bc, 'imm16u -> 'imm16p4s2"); } else { Format(instr, "bc1f 'bc, 'imm16u -> 'imm16p4s2"); } break; case BC1EQZ: Format(instr, "bc1eqz 'ft, 'imm16u -> 'imm16p4s2"); break; case BC1NEZ: Format(instr, "bc1nez 'ft, 'imm16u -> 'imm16p4s2"); break; default: UNREACHABLE(); } } void Decoder::DecodeTypeImmediateREGIMM(Instruction* instr) { switch (instr->RtFieldRaw()) { case BLTZ: Format(instr, "bltz 'rs, 'imm16u -> 'imm16p4s2"); break; case BLTZAL: Format(instr, "bltzal 'rs, 'imm16u -> 'imm16p4s2"); break; case BGEZ: Format(instr, "bgez 'rs, 'imm16u -> 'imm16p4s2"); break; case BGEZAL: { if (instr->RsValue() == 0) Format(instr, "bal 'imm16s -> 'imm16p4s2"); else Format(instr, "bgezal 'rs, 'imm16u -> 'imm16p4s2"); break; } case BGEZALL: Format(instr, "bgezall 'rs, 'imm16u -> 'imm16p4s2"); break; case DAHI: Format(instr, "dahi 'rs, 'imm16x"); break; case DATI: Format(instr, "dati 'rs, 'imm16x"); break; default: UNREACHABLE(); } } void Decoder::DecodeTypeImmediate(Instruction* instr) { switch (instr->OpcodeFieldRaw()) { case COP1: DecodeTypeImmediateCOP1(instr); break; // Case COP1. // ------------- REGIMM class. case REGIMM: DecodeTypeImmediateREGIMM(instr); break; // Case REGIMM. // ------------- Branch instructions. case BEQ: Format(instr, "beq 'rs, 'rt, 'imm16u -> 'imm16p4s2"); break; case BC: Format(instr, "bc 'imm26s -> 'imm26p4s2"); break; case BALC: Format(instr, "balc 'imm26s -> 'imm26p4s2"); break; case BNE: Format(instr, "bne 'rs, 'rt, 'imm16u -> 'imm16p4s2"); break; case BLEZ: if ((instr->RtValue() == 0) && (instr->RsValue() != 0)) { Format(instr, "blez 'rs, 'imm16u -> 'imm16p4s2"); } else if ((instr->RtValue() != instr->RsValue()) && (instr->RsValue() != 0) && (instr->RtValue() != 0)) { Format(instr, "bgeuc 'rs, 'rt, 'imm16u -> 'imm16p4s2"); } else if ((instr->RtValue() == instr->RsValue()) && (instr->RtValue() != 0)) { Format(instr, "bgezalc 'rs, 'imm16u -> 'imm16p4s2"); } else if ((instr->RsValue() == 0) && (instr->RtValue() != 0)) { Format(instr, "blezalc 'rt, 'imm16u -> 'imm16p4s2"); } else { UNREACHABLE(); } break; case BGTZ: if ((instr->RtValue() == 0) && (instr->RsValue() != 0)) { Format(instr, "bgtz 'rs, 'imm16u -> 'imm16p4s2"); } else if ((instr->RtValue() != instr->RsValue()) && (instr->RsValue() != 0) && (instr->RtValue() != 0)) { Format(instr, "bltuc 'rs, 'rt, 'imm16u -> 'imm16p4s2"); } else if ((instr->RtValue() == instr->RsValue()) && (instr->RtValue() != 0)) { Format(instr, "bltzalc 'rt, 'imm16u -> 'imm16p4s2"); } else if ((instr->RsValue() == 0) && (instr->RtValue() != 0)) { Format(instr, "bgtzalc 'rt, 'imm16u -> 'imm16p4s2"); } else { UNREACHABLE(); } break; case BLEZL: if ((instr->RtValue() == instr->RsValue()) && (instr->RtValue() != 0)) { Format(instr, "bgezc 'rt, 'imm16u -> 'imm16p4s2"); } else if ((instr->RtValue() != instr->RsValue()) && (instr->RsValue() != 0) && (instr->RtValue() != 0)) { Format(instr, "bgec 'rs, 'rt, 'imm16u -> 'imm16p4s2"); } else if ((instr->RsValue() == 0) && (instr->RtValue() != 0)) { Format(instr, "blezc 'rt, 'imm16u -> 'imm16p4s2"); } else { UNREACHABLE(); } break; case BGTZL: if ((instr->RtValue() == instr->RsValue()) && (instr->RtValue() != 0)) { Format(instr, "bltzc 'rt, 'imm16u -> 'imm16p4s2"); } else if ((instr->RtValue() != instr->RsValue()) && (instr->RsValue() != 0) && (instr->RtValue() != 0)) { Format(instr, "bltc 'rs, 'rt, 'imm16u -> 'imm16p4s2"); } else if ((instr->RsValue() == 0) && (instr->RtValue() != 0)) { Format(instr, "bgtzc 'rt, 'imm16u -> 'imm16p4s2"); } else { UNREACHABLE(); } break; case POP66: if (instr->RsValue() == JIC) { Format(instr, "jic 'rt, 'imm16s"); } else { Format(instr, "beqzc 'rs, 'imm21x -> 'imm21p4s2"); } break; case POP76: if (instr->RsValue() == JIALC) { Format(instr, "jialc 'rt, 'imm16x"); } else { Format(instr, "bnezc 'rs, 'imm21x -> 'imm21p4s2"); } break; // ------------- Arithmetic instructions. case ADDI: if (kArchVariant != kMips64r6) { Format(instr, "addi 'rt, 'rs, 'imm16s"); } else { // Check if BOVC or BEQC instruction. if (instr->RsValue() >= instr->RtValue()) { Format(instr, "bovc 'rs, 'rt, 'imm16s -> 'imm16p4s2"); } else if (instr->RsValue() < instr->RtValue()) { Format(instr, "beqc 'rs, 'rt, 'imm16s -> 'imm16p4s2"); } else { UNREACHABLE(); } } break; case DADDI: if (kArchVariant != kMips64r6) { Format(instr, "daddi 'rt, 'rs, 'imm16s"); } else { // Check if BNVC or BNEC instruction. if (instr->RsValue() >= instr->RtValue()) { Format(instr, "bnvc 'rs, 'rt, 'imm16s -> 'imm16p4s2"); } else if (instr->RsValue() < instr->RtValue()) { Format(instr, "bnec 'rs, 'rt, 'imm16s -> 'imm16p4s2"); } else { UNREACHABLE(); } } break; case ADDIU: Format(instr, "addiu 'rt, 'rs, 'imm16s"); break; case DADDIU: Format(instr, "daddiu 'rt, 'rs, 'imm16s"); break; case SLTI: Format(instr, "slti 'rt, 'rs, 'imm16s"); break; case SLTIU: Format(instr, "sltiu 'rt, 'rs, 'imm16u"); break; case ANDI: Format(instr, "andi 'rt, 'rs, 'imm16x"); break; case ORI: Format(instr, "ori 'rt, 'rs, 'imm16x"); break; case XORI: Format(instr, "xori 'rt, 'rs, 'imm16x"); break; case LUI: if (kArchVariant != kMips64r6) { Format(instr, "lui 'rt, 'imm16x"); } else { if (instr->RsValue() != 0) { Format(instr, "aui 'rt, 'rs, 'imm16x"); } else { Format(instr, "lui 'rt, 'imm16x"); } } break; case DAUI: Format(instr, "daui 'rt, 'rs, 'imm16x"); break; // ------------- Memory instructions. case LB: Format(instr, "lb 'rt, 'imm16s('rs)"); break; case LH: Format(instr, "lh 'rt, 'imm16s('rs)"); break; case LWL: Format(instr, "lwl 'rt, 'imm16s('rs)"); break; case LDL: Format(instr, "ldl 'rt, 'imm16s('rs)"); break; case LW: Format(instr, "lw 'rt, 'imm16s('rs)"); break; case LWU: Format(instr, "lwu 'rt, 'imm16s('rs)"); break; case LD: Format(instr, "ld 'rt, 'imm16s('rs)"); break; case LBU: Format(instr, "lbu 'rt, 'imm16s('rs)"); break; case LHU: Format(instr, "lhu 'rt, 'imm16s('rs)"); break; case LWR: Format(instr, "lwr 'rt, 'imm16s('rs)"); break; case LDR: Format(instr, "ldr 'rt, 'imm16s('rs)"); break; case PREF: Format(instr, "pref 'rt, 'imm16s('rs)"); break; case SB: Format(instr, "sb 'rt, 'imm16s('rs)"); break; case SH: Format(instr, "sh 'rt, 'imm16s('rs)"); break; case SWL: Format(instr, "swl 'rt, 'imm16s('rs)"); break; case SW: Format(instr, "sw 'rt, 'imm16s('rs)"); break; case SD: Format(instr, "sd 'rt, 'imm16s('rs)"); break; case SWR: Format(instr, "swr 'rt, 'imm16s('rs)"); break; case LWC1: Format(instr, "lwc1 'ft, 'imm16s('rs)"); break; case LDC1: Format(instr, "ldc1 'ft, 'imm16s('rs)"); break; case SWC1: Format(instr, "swc1 'ft, 'imm16s('rs)"); break; case SDC1: Format(instr, "sdc1 'ft, 'imm16s('rs)"); break; case PCREL: { int32_t imm21 = instr->Imm21Value(); // rt field: 5-bits checking uint8_t rt = (imm21 >> kImm16Bits); switch (rt) { case ALUIPC: Format(instr, "aluipc 'rs, 'imm16s"); break; case AUIPC: Format(instr, "auipc 'rs, 'imm16s"); break; default: { // rt field: checking of the most significant 3-bits rt = (imm21 >> kImm18Bits); switch (rt) { case LDPC: Format(instr, "ldpc 'rs, 'imm18s"); break; default: { // rt field: checking of the most significant 2-bits rt = (imm21 >> kImm19Bits); switch (rt) { case LWUPC: Format(instr, "lwupc 'rs, 'imm19s"); break; case LWPC: Format(instr, "lwpc 'rs, 'imm19s"); break; case ADDIUPC: Format(instr, "addiupc 'rs, 'imm19s"); break; default: UNREACHABLE(); break; } break; } } break; } } break; } default: printf("a 0x%x \n", instr->OpcodeFieldRaw()); UNREACHABLE(); break; } } void Decoder::DecodeTypeJump(Instruction* instr) { switch (instr->OpcodeFieldRaw()) { case J: Format(instr, "j 'imm26x -> 'imm26j"); break; case JAL: Format(instr, "jal 'imm26x -> 'imm26j"); break; default: UNREACHABLE(); } } // Disassemble the instruction at *instr_ptr into the output buffer. // All instructions are one word long, except for the simulator // psuedo-instruction stop(msg). For that one special case, we return // size larger than one kInstrSize. int Decoder::InstructionDecode(byte* instr_ptr) { Instruction* instr = Instruction::At(instr_ptr); // Print raw instruction bytes. out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%08x ", instr->InstructionBits()); switch (instr->InstructionType(Instruction::TypeChecks::EXTRA)) { case Instruction::kRegisterType: { return DecodeTypeRegister(instr); } case Instruction::kImmediateType: { DecodeTypeImmediate(instr); break; } case Instruction::kJumpType: { DecodeTypeJump(instr); break; } default: { Format(instr, "UNSUPPORTED"); UNSUPPORTED_MIPS(); } } return Instruction::kInstrSize; } } // namespace internal } // namespace v8 //------------------------------------------------------------------------------ namespace disasm { const char* NameConverter::NameOfAddress(byte* addr) const { v8::internal::SNPrintF(tmp_buffer_, "%p", addr); return tmp_buffer_.start(); } const char* NameConverter::NameOfConstant(byte* addr) const { return NameOfAddress(addr); } const char* NameConverter::NameOfCPURegister(int reg) const { return v8::internal::Registers::Name(reg); } const char* NameConverter::NameOfXMMRegister(int reg) const { return v8::internal::FPURegisters::Name(reg); } const char* NameConverter::NameOfByteCPURegister(int reg) const { UNREACHABLE(); // MIPS does not have the concept of a byte register. return "nobytereg"; } const char* NameConverter::NameInCode(byte* addr) const { // The default name converter is called for unknown code. So we will not try // to access any memory. return ""; } //------------------------------------------------------------------------------ Disassembler::Disassembler(const NameConverter& converter) : converter_(converter) {} Disassembler::~Disassembler() {} int Disassembler::InstructionDecode(v8::internal::Vector<char> buffer, byte* instruction) { v8::internal::Decoder d(converter_, buffer); return d.InstructionDecode(instruction); } // The MIPS assembler does not currently use constant pools. int Disassembler::ConstantPoolSizeAt(byte* instruction) { return -1; } void Disassembler::Disassemble(FILE* f, byte* begin, byte* end) { NameConverter converter; Disassembler d(converter); for (byte* pc = begin; pc < end;) { v8::internal::EmbeddedVector<char, 128> buffer; buffer[0] = '\0'; byte* prev_pc = pc; pc += d.InstructionDecode(buffer, pc); v8::internal::PrintF(f, "%p %08x %s\n", prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start()); } } #undef UNSUPPORTED } // namespace disasm #endif // V8_TARGET_ARCH_MIPS64