| // 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 <stdio.h> |
| #include <stdarg.h> |
| #include <string.h> |
| |
| #include "src/v8.h" |
| |
| #if V8_TARGET_ARCH_MIPS |
| |
| #include "src/mips/constants-mips.h" |
| #include "src/disasm.h" |
| #include "src/macro-assembler.h" |
| #include "src/platform.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 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 PrintXImm26(Instruction* instr); |
| void PrintCode(Instruction* instr); // For break and trap instructions. |
| // 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); |
| |
| // Each of these functions decodes one particular instruction type. |
| void DecodeTypeRegister(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::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()) << 16) >> 16; |
| 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 26-bit immediate value. |
| void Decoder::PrintXImm26(Instruction* instr) { |
| uint32_t imm = instr->Imm26Value() << kImmFieldShift; |
| out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm); |
| } |
| |
| |
| // 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; |
| } |
| } |
| |
| |
| // 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) { |
| ASSERT(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) { |
| ASSERT(format[0] == 'f'); |
| 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. |
| ASSERT(STRING_STARTS_WITH(format, "code")); |
| PrintCode(instr); |
| return 4; |
| } |
| case 'i': { // 'imm16u or 'imm26. |
| if (format[3] == '1') { |
| ASSERT(STRING_STARTS_WITH(format, "imm16")); |
| if (format[5] == 's') { |
| ASSERT(STRING_STARTS_WITH(format, "imm16s")); |
| PrintSImm16(instr); |
| } else if (format[5] == 'u') { |
| ASSERT(STRING_STARTS_WITH(format, "imm16u")); |
| PrintSImm16(instr); |
| } else { |
| ASSERT(STRING_STARTS_WITH(format, "imm16x")); |
| PrintXImm16(instr); |
| } |
| return 6; |
| } else { |
| ASSERT(STRING_STARTS_WITH(format, "imm26x")); |
| PrintXImm26(instr); |
| 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': { |
| ASSERT(STRING_STARTS_WITH(format, "sa")); |
| PrintSa(instr); |
| return 2; |
| } |
| case 'd': { |
| ASSERT(STRING_STARTS_WITH(format, "sd")); |
| PrintSd(instr); |
| return 2; |
| } |
| case 's': { |
| if (format[2] == '1') { |
| ASSERT(STRING_STARTS_WITH(format, "ss1")); /* ext size */ |
| PrintSs1(instr); |
| return 3; |
| } else { |
| ASSERT(STRING_STARTS_WITH(format, "ss2")); /* ins size */ |
| PrintSs2(instr); |
| return 3; |
| } |
| } |
| } |
| } |
| case 'b': { // 'bc - Special for bc1 cc field. |
| ASSERT(STRING_STARTS_WITH(format, "bc")); |
| PrintBc(instr); |
| return 2; |
| } |
| case 'C': { // 'Cc - Special for c.xx.d cc field. |
| ASSERT(STRING_STARTS_WITH(format, "Cc")); |
| PrintCc(instr); |
| return 2; |
| } |
| } |
| 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"); |
| } |
| |
| |
| void Decoder::DecodeTypeRegister(Instruction* instr) { |
| switch (instr->OpcodeFieldRaw()) { |
| case COP1: // Coprocessor instructions. |
| switch (instr->RsFieldRaw()) { |
| case BC1: // bc1 handled in DecodeTypeImmediate. |
| UNREACHABLE(); |
| break; |
| case MFC1: |
| Format(instr, "mfc1 'rt, 'fs"); |
| break; |
| case MFHC1: |
| Format(instr, "mfhc1 'rt, 'fs"); |
| break; |
| case MTC1: |
| Format(instr, "mtc1 '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 D: |
| switch (instr->FunctionFieldRaw()) { |
| case ADD_D: |
| Format(instr, "add.d 'fd, 'fs, 'ft"); |
| break; |
| case SUB_D: |
| Format(instr, "sub.d 'fd, 'fs, 'ft"); |
| break; |
| case MUL_D: |
| Format(instr, "mul.d 'fd, 'fs, 'ft"); |
| break; |
| case DIV_D: |
| Format(instr, "div.d 'fd, 'fs, 'ft"); |
| break; |
| case ABS_D: |
| Format(instr, "abs.d 'fd, 'fs"); |
| break; |
| case MOV_D: |
| Format(instr, "mov.d 'fd, 'fs"); |
| break; |
| case NEG_D: |
| Format(instr, "neg.d 'fd, 'fs"); |
| break; |
| case SQRT_D: |
| Format(instr, "sqrt.d 'fd, 'fs"); |
| break; |
| case CVT_W_D: |
| Format(instr, "cvt.w.d 'fd, 'fs"); |
| break; |
| case CVT_L_D: { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "cvt.l.d 'fd, 'fs"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| case TRUNC_W_D: |
| Format(instr, "trunc.w.d 'fd, 'fs"); |
| break; |
| case TRUNC_L_D: { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "trunc.l.d 'fd, 'fs"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| case ROUND_W_D: |
| Format(instr, "round.w.d 'fd, 'fs"); |
| break; |
| case FLOOR_W_D: |
| Format(instr, "floor.w.d 'fd, 'fs"); |
| break; |
| case CEIL_W_D: |
| Format(instr, "ceil.w.d 'fd, 'fs"); |
| break; |
| case CVT_S_D: |
| Format(instr, "cvt.s.d 'fd, 'fs"); |
| break; |
| case C_F_D: |
| Format(instr, "c.f.d 'fs, 'ft, 'Cc"); |
| break; |
| case C_UN_D: |
| Format(instr, "c.un.d 'fs, 'ft, 'Cc"); |
| break; |
| case C_EQ_D: |
| Format(instr, "c.eq.d 'fs, 'ft, 'Cc"); |
| break; |
| case C_UEQ_D: |
| Format(instr, "c.ueq.d 'fs, 'ft, 'Cc"); |
| break; |
| case C_OLT_D: |
| Format(instr, "c.olt.d 'fs, 'ft, 'Cc"); |
| break; |
| case C_ULT_D: |
| Format(instr, "c.ult.d 'fs, 'ft, 'Cc"); |
| break; |
| case C_OLE_D: |
| Format(instr, "c.ole.d 'fs, 'ft, 'Cc"); |
| break; |
| case C_ULE_D: |
| Format(instr, "c.ule.d 'fs, 'ft, 'Cc"); |
| break; |
| default: |
| Format(instr, "unknown.cop1.d"); |
| break; |
| } |
| break; |
| case S: |
| UNIMPLEMENTED_MIPS(); |
| break; |
| case W: |
| switch (instr->FunctionFieldRaw()) { |
| 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; |
| default: |
| UNREACHABLE(); |
| } |
| break; |
| case L: |
| switch (instr->FunctionFieldRaw()) { |
| case CVT_D_L: { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "cvt.d.l 'fd, 'fs"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| case CVT_S_L: { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "cvt.s.l 'fd, 'fs"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| default: |
| UNREACHABLE(); |
| } |
| break; |
| case PS: |
| UNIMPLEMENTED_MIPS(); |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| break; |
| case COP1X: |
| switch (instr->FunctionFieldRaw()) { |
| case MADD_D: |
| Format(instr, "madd.d 'fd, 'fr, 'fs, 'ft"); |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| break; |
| case SPECIAL: |
| switch (instr->FunctionFieldRaw()) { |
| case JR: |
| Format(instr, "jr 'rs"); |
| break; |
| case JALR: |
| Format(instr, "jalr 'rs"); |
| break; |
| case SLL: |
| if ( 0x0 == static_cast<int>(instr->InstructionBits())) |
| Format(instr, "nop"); |
| else |
| Format(instr, "sll 'rd, 'rt, 'sa"); |
| break; |
| case SRL: |
| if (instr->RsValue() == 0) { |
| Format(instr, "srl 'rd, 'rt, 'sa"); |
| } else { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "rotr 'rd, 'rt, 'sa"); |
| } else { |
| Unknown(instr); |
| } |
| } |
| break; |
| case SRA: |
| Format(instr, "sra 'rd, 'rt, 'sa"); |
| break; |
| case SLLV: |
| Format(instr, "sllv 'rd, 'rt, 'rs"); |
| break; |
| case SRLV: |
| if (instr->SaValue() == 0) { |
| Format(instr, "srlv 'rd, 'rt, 'rs"); |
| } else { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "rotrv 'rd, 'rt, 'rs"); |
| } else { |
| Unknown(instr); |
| } |
| } |
| break; |
| case SRAV: |
| Format(instr, "srav 'rd, 'rt, 'rs"); |
| break; |
| case MFHI: |
| Format(instr, "mfhi 'rd"); |
| break; |
| case MFLO: |
| Format(instr, "mflo 'rd"); |
| break; |
| case MULT: |
| Format(instr, "mult 'rs, 'rt"); |
| break; |
| case MULTU: |
| Format(instr, "multu 'rs, 'rt"); |
| break; |
| case DIV: |
| Format(instr, "div 'rs, 'rt"); |
| break; |
| case DIVU: |
| Format(instr, "divu 'rs, 'rt"); |
| break; |
| case ADD: |
| Format(instr, "add 'rd, 'rs, 'rt"); |
| break; |
| case ADDU: |
| Format(instr, "addu 'rd, 'rs, 'rt"); |
| break; |
| case SUB: |
| Format(instr, "sub 'rd, 'rs, 'rt"); |
| break; |
| case SUBU: |
| Format(instr, "subu '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 BREAK: |
| Format(instr, "break, code: 'code"); |
| 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; |
| default: |
| UNREACHABLE(); |
| } |
| break; |
| case SPECIAL2: |
| switch (instr->FunctionFieldRaw()) { |
| case MUL: |
| Format(instr, "mul 'rd, 'rs, 'rt"); |
| break; |
| case CLZ: |
| Format(instr, "clz 'rd, 'rs"); |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| break; |
| case SPECIAL3: |
| switch (instr->FunctionFieldRaw()) { |
| case INS: { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "ins 'rt, 'rs, 'sa, 'ss2"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| case EXT: { |
| if (kArchVariant == kMips32r2) { |
| Format(instr, "ext 'rt, 'rs, 'sa, 'ss1"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| default: |
| UNREACHABLE(); |
| } |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| } |
| |
| |
| void Decoder::DecodeTypeImmediate(Instruction* instr) { |
| switch (instr->OpcodeFieldRaw()) { |
| // ------------- REGIMM class. |
| case COP1: |
| switch (instr->RsFieldRaw()) { |
| case BC1: |
| if (instr->FBtrueValue()) { |
| Format(instr, "bc1t 'bc, 'imm16u"); |
| } else { |
| Format(instr, "bc1f 'bc, 'imm16u"); |
| } |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| break; // Case COP1. |
| case REGIMM: |
| switch (instr->RtFieldRaw()) { |
| case BLTZ: |
| Format(instr, "bltz 'rs, 'imm16u"); |
| break; |
| case BLTZAL: |
| Format(instr, "bltzal 'rs, 'imm16u"); |
| break; |
| case BGEZ: |
| Format(instr, "bgez 'rs, 'imm16u"); |
| break; |
| case BGEZAL: |
| Format(instr, "bgezal 'rs, 'imm16u"); |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| break; // Case REGIMM. |
| // ------------- Branch instructions. |
| case BEQ: |
| Format(instr, "beq 'rs, 'rt, 'imm16u"); |
| break; |
| case BNE: |
| Format(instr, "bne 'rs, 'rt, 'imm16u"); |
| break; |
| case BLEZ: |
| Format(instr, "blez 'rs, 'imm16u"); |
| break; |
| case BGTZ: |
| Format(instr, "bgtz 'rs, 'imm16u"); |
| break; |
| // ------------- Arithmetic instructions. |
| case ADDI: |
| Format(instr, "addi 'rt, 'rs, 'imm16s"); |
| break; |
| case ADDIU: |
| Format(instr, "addiu '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: |
| Format(instr, "lui 'rt, '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 LW: |
| Format(instr, "lw '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 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 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; |
| default: |
| UNREACHABLE(); |
| break; |
| } |
| } |
| |
| |
| void Decoder::DecodeTypeJump(Instruction* instr) { |
| switch (instr->OpcodeFieldRaw()) { |
| case J: |
| Format(instr, "j 'imm26x"); |
| break; |
| case JAL: |
| Format(instr, "jal 'imm26x"); |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| } |
| |
| |
| // Disassemble the instruction at *instr_ptr into the output buffer. |
| 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()) { |
| case Instruction::kRegisterType: { |
| DecodeTypeRegister(instr); |
| break; |
| } |
| case Instruction::kImmediateType: { |
| DecodeTypeImmediate(instr); |
| break; |
| } |
| case Instruction::kJumpType: { |
| DecodeTypeJump(instr); |
| break; |
| } |
| default: { |
| Format(instr, "UNSUPPORTED"); |
| UNSUPPORTED_MIPS(); |
| } |
| } |
| return Instruction::kInstrSize; |
| } |
| |
| |
| } } // namespace v8::internal |
| |
| |
| |
| //------------------------------------------------------------------------------ |
| |
| 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_MIPS |
