| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "vm/disassembler.h" |
| |
| #include "vm/globals.h" // Needed here to get TARGET_ARCH_ARM. |
| #if defined(TARGET_ARCH_ARM) |
| |
| #include "platform/assert.h" |
| #include "vm/cpu.h" |
| |
| namespace dart { |
| |
| class ARMDecoder : public ValueObject { |
| public: |
| ARMDecoder(char* buffer, size_t buffer_size) |
| : buffer_(buffer), |
| buffer_size_(buffer_size), |
| buffer_pos_(0) { |
| buffer_[buffer_pos_] = '\0'; |
| } |
| |
| ~ARMDecoder() {} |
| |
| // Writes one disassembled instruction into 'buffer' (0-terminated). |
| // Returns true if the instruction was successfully decoded, false otherwise. |
| void InstructionDecode(uword pc); |
| |
| private: |
| // Bottleneck functions to print into the out_buffer. |
| void Print(const char* str); |
| |
| // Printing of common values. |
| void PrintRegister(int reg); |
| void PrintSRegister(int reg); |
| void PrintDRegister(int reg); |
| void PrintDRegisterList(int start, int reg_count); |
| void PrintQRegister(int reg); |
| void PrintCondition(Instr* instr); |
| void PrintShiftRm(Instr* instr); |
| void PrintShiftImm(Instr* instr); |
| void PrintPU(Instr* instr); |
| |
| // Handle formatting of instructions and their options. |
| int FormatRegister(Instr* instr, const char* option); |
| int FormatSRegister(Instr* instr, const char* option); |
| int FormatDRegister(Instr* instr, const char* option); |
| int FormatQRegister(Instr* instr, const char* option); |
| int FormatOption(Instr* instr, const char* option); |
| void Format(Instr* instr, const char* format); |
| void Unknown(Instr* instr); |
| |
| // Each of these functions decodes one particular instruction type, a 3-bit |
| // field in the instruction encoding. |
| // Types 0 and 1 are combined as they are largely the same except for the way |
| // they interpret the shifter operand. |
| void DecodeType01(Instr* instr); |
| void DecodeType2(Instr* instr); |
| void DecodeType3(Instr* instr); |
| void DecodeType4(Instr* instr); |
| void DecodeType5(Instr* instr); |
| void DecodeType6(Instr* instr); |
| void DecodeType7(Instr* instr); |
| void DecodeSIMDDataProcessing(Instr* instr); |
| |
| // Convenience functions. |
| char* get_buffer() const { return buffer_; } |
| char* current_position_in_buffer() { return buffer_ + buffer_pos_; } |
| size_t remaining_size_in_buffer() { return buffer_size_ - buffer_pos_; } |
| |
| char* buffer_; // Decode instructions into this buffer. |
| size_t buffer_size_; // The size of the character buffer. |
| size_t buffer_pos_; // Current character position in buffer. |
| |
| DISALLOW_ALLOCATION(); |
| DISALLOW_COPY_AND_ASSIGN(ARMDecoder); |
| }; |
| |
| |
| // Support for assertions in the ARMDecoder formatting functions. |
| #define STRING_STARTS_WITH(string, compare_string) \ |
| (strncmp(string, compare_string, strlen(compare_string)) == 0) |
| |
| |
| // Append the str to the output buffer. |
| void ARMDecoder::Print(const char* str) { |
| char cur = *str++; |
| while (cur != '\0' && (buffer_pos_ < (buffer_size_ - 1))) { |
| buffer_[buffer_pos_++] = cur; |
| cur = *str++; |
| } |
| buffer_[buffer_pos_] = '\0'; |
| } |
| |
| |
| // These condition names are defined in a way to match the native disassembler |
| // formatting. See for example the command "objdump -d <binary file>". |
| static const char* cond_names[kMaxCondition] = { |
| "eq", "ne", "cs" , "cc" , "mi" , "pl" , "vs" , "vc" , |
| "hi", "ls", "ge", "lt", "gt", "le", "", "invalid", |
| }; |
| |
| |
| // Print the condition guarding the instruction. |
| void ARMDecoder::PrintCondition(Instr* instr) { |
| Print(cond_names[instr->ConditionField()]); |
| } |
| |
| |
| // These register names are defined in a way to match the native disassembler |
| // formatting, except for register alias pp (r9). |
| // See for example the command "objdump -d <binary file>". |
| static const char* reg_names[kNumberOfCpuRegisters] = { |
| "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| "r8", "pp", "r10", "fp", "ip", "sp", "lr", "pc", |
| }; |
| |
| |
| // Print the register name according to the active name converter. |
| void ARMDecoder::PrintRegister(int reg) { |
| ASSERT(0 <= reg); |
| ASSERT(reg < kNumberOfCpuRegisters); |
| Print(reg_names[reg]); |
| } |
| |
| |
| void ARMDecoder::PrintSRegister(int reg) { |
| ASSERT(0 <= reg); |
| ASSERT(reg < kNumberOfSRegisters); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "s%d", reg); |
| } |
| |
| |
| void ARMDecoder::PrintDRegister(int reg) { |
| ASSERT(0 <= reg); |
| ASSERT(reg < kNumberOfDRegisters); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "d%d", reg); |
| } |
| |
| |
| void ARMDecoder::PrintQRegister(int reg) { |
| ASSERT(0 <= reg); |
| ASSERT(reg < kNumberOfQRegisters); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "q%d", reg); |
| } |
| |
| |
| // These shift names are defined in a way to match the native disassembler |
| // formatting. See for example the command "objdump -d <binary file>". |
| static const char* shift_names[kMaxShift] = { |
| "lsl", "lsr", "asr", "ror" |
| }; |
| |
| |
| // Print the register shift operands for the instruction. Generally used for |
| // data processing instructions. |
| void ARMDecoder::PrintShiftRm(Instr* instr) { |
| Shift shift = instr->ShiftField(); |
| int shift_amount = instr->ShiftAmountField(); |
| int rm = instr->RmField(); |
| |
| PrintRegister(rm); |
| |
| if ((instr->RegShiftField() == 0) && (shift == LSL) && (shift_amount == 0)) { |
| // Special case for using rm only. |
| return; |
| } |
| if (instr->RegShiftField() == 0) { |
| // by immediate |
| if ((shift == ROR) && (shift_amount == 0)) { |
| Print(", RRX"); |
| return; |
| } else if (((shift == LSR) || (shift == ASR)) && (shift_amount == 0)) { |
| shift_amount = 32; |
| } |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| ", %s #%d", |
| shift_names[shift], |
| shift_amount); |
| } else { |
| // by register |
| int rs = instr->RsField(); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| ", %s ", |
| shift_names[shift]); |
| PrintRegister(rs); |
| } |
| } |
| |
| |
| // Print the immediate operand for the instruction. Generally used for data |
| // processing instructions. |
| void ARMDecoder::PrintShiftImm(Instr* instr) { |
| int rotate = instr->RotateField() * 2; |
| int immed8 = instr->Immed8Field(); |
| int imm = (immed8 >> rotate) | (immed8 << (32 - rotate)); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "#%d", |
| imm); |
| } |
| |
| |
| // Print PU formatting to reduce complexity of FormatOption. |
| void ARMDecoder::PrintPU(Instr* instr) { |
| switch (instr->PUField()) { |
| case 0: { |
| Print("da"); |
| break; |
| } |
| case 1: { |
| Print("ia"); |
| break; |
| } |
| case 2: { |
| Print("db"); |
| break; |
| } |
| case 3: { |
| Print("ib"); |
| break; |
| } |
| default: { |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| |
| |
| // Handle all register based formatting in these functions to reduce the |
| // complexity of FormatOption. |
| int ARMDecoder::FormatRegister(Instr* instr, const char* format) { |
| ASSERT(format[0] == 'r'); |
| if (format[1] == 'n') { // 'rn: Rn register |
| int reg = instr->RnField(); |
| PrintRegister(reg); |
| return 2; |
| } else if (format[1] == 'd') { // 'rd: Rd register |
| int reg = instr->RdField(); |
| PrintRegister(reg); |
| if (format[2] == '2') { // 'rd2: possibly Rd, Rd+1 register pair |
| if (instr->HasSign() && !instr->HasL()) { |
| if ((reg % 2) != 0) { |
| Print(" *** unknown (odd register pair) ***"); |
| } else { |
| Print(", "); |
| PrintRegister(reg + 1); |
| } |
| } |
| return 3; |
| } |
| return 2; |
| } else if (format[1] == 's') { // 'rs: Rs register |
| int reg = instr->RsField(); |
| PrintRegister(reg); |
| return 2; |
| } else if (format[1] == 'm') { // 'rm: Rm register |
| int reg = instr->RmField(); |
| PrintRegister(reg); |
| return 2; |
| } else if (format[1] == 'l') { |
| // 'rlist: register list for load and store multiple instructions |
| ASSERT(STRING_STARTS_WITH(format, "rlist")); |
| int rlist = instr->RlistField(); |
| int reg = 0; |
| Print("{"); |
| // Print register list in ascending order, by scanning the bit mask. |
| while (rlist != 0) { |
| if ((rlist & 1) != 0) { |
| PrintRegister(reg); |
| if ((rlist >> 1) != 0) { |
| Print(", "); |
| } |
| } |
| reg++; |
| rlist >>= 1; |
| } |
| Print("}"); |
| return 5; |
| } |
| UNREACHABLE(); |
| return -1; |
| } |
| |
| |
| int ARMDecoder::FormatSRegister(Instr* instr, const char* format) { |
| ASSERT(format[0] == 's'); |
| if (format[1] == 'n') { // 'sn: Sn register |
| int reg = instr->SnField(); |
| PrintSRegister(reg); |
| return 2; |
| } else if (format[1] == 'd') { // 'sd: Sd register |
| int reg = instr->SdField(); |
| PrintSRegister(reg); |
| return 2; |
| } else if (format[1] == 'm') { |
| int reg = instr->SmField(); |
| if (format[2] == '1') { // 'sm1: S[m+1] register |
| reg++; |
| ASSERT(reg < kNumberOfSRegisters); |
| PrintSRegister(reg); |
| return 3; |
| } else { // 'sm: Sm register |
| PrintSRegister(reg); |
| return 2; |
| } |
| } else if (format[1] == 'l') { |
| ASSERT(STRING_STARTS_WITH(format, "slist")); |
| int reg_count = instr->Bits(0, 8); |
| int start = instr->Bit(22) | (instr->Bits(12, 4) << 1); |
| Print("{"); |
| for (int i = start; i < start + reg_count; i++) { |
| PrintSRegister(i); |
| if (i != start + reg_count - 1) { |
| Print(", "); |
| } |
| } |
| Print("}"); |
| return 5; |
| } |
| UNREACHABLE(); |
| return -1; |
| } |
| |
| |
| void ARMDecoder::PrintDRegisterList(int start, int reg_count) { |
| Print("{"); |
| for (int i = start; i < start + reg_count; i++) { |
| PrintDRegister(i); |
| if (i != start + reg_count - 1) { |
| Print(", "); |
| } |
| } |
| Print("}"); |
| } |
| |
| |
| int ARMDecoder::FormatDRegister(Instr* instr, const char* format) { |
| ASSERT(format[0] == 'd'); |
| if (format[1] == 'n') { // 'dn: Dn register |
| int reg = instr->DnField(); |
| PrintDRegister(reg); |
| return 2; |
| } else if (format[1] == 'd') { // 'dd: Dd register |
| int reg = instr->DdField(); |
| PrintDRegister(reg); |
| return 2; |
| } else if (format[1] == 'm') { // 'dm: Dm register |
| int reg = instr->DmField(); |
| PrintDRegister(reg); |
| return 2; |
| } else if (format[1] == 'l') { |
| ASSERT(STRING_STARTS_WITH(format, "dlist")); |
| int reg_count = instr->Bits(0, 8) >> 1; |
| int start = (instr->Bit(22) << 4) | instr->Bits(12, 4); |
| PrintDRegisterList(start, reg_count); |
| return 5; |
| } else if (format[1] == 't') { |
| ASSERT(STRING_STARTS_WITH(format, "dtbllist")); |
| int reg_count = instr->Bits(8, 2) + 1; |
| int start = (instr->Bit(7) << 4) | instr->Bits(16, 4); |
| PrintDRegisterList(start, reg_count); |
| return 8; |
| } |
| UNREACHABLE(); |
| return -1; |
| } |
| |
| |
| int ARMDecoder::FormatQRegister(Instr* instr, const char* format) { |
| ASSERT(format[0] == 'q'); |
| if (format[1] == 'n') { // 'qn: Qn register |
| int reg = instr->QnField(); |
| PrintQRegister(reg); |
| return 2; |
| } else if (format[1] == 'd') { // 'qd: Qd register |
| int reg = instr->QdField(); |
| PrintQRegister(reg); |
| return 2; |
| } else if (format[1] == 'm') { // 'qm: Qm register |
| int reg = instr->QmField(); |
| PrintQRegister(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 ARMDecoder::FormatOption(Instr* instr, const char* format) { |
| switch (format[0]) { |
| case 'a': { // 'a: accumulate multiplies |
| if (instr->Bit(21) == 0) { |
| Print("ul"); |
| } else { |
| Print("la"); |
| } |
| return 1; |
| } |
| case 'b': { // 'b: byte loads or stores |
| if (instr->HasB()) { |
| Print("b"); |
| } |
| return 1; |
| } |
| case 'c': { // 'cond: conditional execution |
| ASSERT(STRING_STARTS_WITH(format, "cond")); |
| PrintCondition(instr); |
| return 4; |
| } |
| case 'd': { |
| if (format[1] == 'e') { // 'dest: branch destination |
| ASSERT(STRING_STARTS_WITH(format, "dest")); |
| int off = (instr->SImmed24Field() << 2) + 8; |
| uword destination = reinterpret_cast<uword>(instr) + off; |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%#" Px "", |
| destination); |
| return 4; |
| } else { |
| return FormatDRegister(instr, format); |
| } |
| } |
| case 'q': { |
| return FormatQRegister(instr, format); |
| } |
| case 'i': { // 'imm12_4, imm4_12, immf, or immd |
| uint16_t immed16; |
| if (format[3] == 'f') { |
| ASSERT(STRING_STARTS_WITH(format, "immf")); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%f", |
| instr->ImmFloatField()); |
| return 4; |
| } else if (format[3] == 'd') { |
| ASSERT(STRING_STARTS_WITH(format, "immd")); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%g", |
| instr->ImmDoubleField()); |
| return 4; |
| } else if (format[3] == '1') { |
| ASSERT(STRING_STARTS_WITH(format, "imm12_4")); |
| immed16 = instr->BkptField(); |
| } else { |
| ASSERT(format[3] == '4'); |
| if (format[5] == 'v') { |
| ASSERT(STRING_STARTS_WITH(format, "imm4_vdup")); |
| int32_t idx = -1; |
| int32_t imm4 = instr->Bits(16, 4); |
| if ((imm4 & 1) != 0) idx = imm4 >> 1; |
| else if ((imm4 & 2) != 0) idx = imm4 >> 2; |
| else if ((imm4 & 4) != 0) idx = imm4 >> 3; |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%d", |
| idx); |
| return 9; |
| } else { |
| ASSERT(STRING_STARTS_WITH(format, "imm4_12")); |
| immed16 = instr->MovwField(); |
| } |
| } |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "0x%x", |
| immed16); |
| return 7; |
| } |
| case 'l': { // 'l: branch and link |
| if (instr->HasLink()) { |
| Print("l"); |
| } |
| return 1; |
| } |
| case 'm': { // 'memop: load/store instructions |
| ASSERT(STRING_STARTS_WITH(format, "memop")); |
| if (instr->HasL() || |
| // Extra load/store instructions. |
| ((instr->TypeField() == 0) && instr->HasSign() && !instr->HasH())) { |
| Print("ldr"); |
| } else { |
| Print("str"); |
| } |
| return 5; |
| } |
| case 'o': { |
| if (format[3] == '1') { |
| if (format[4] == '0') { |
| // 'off10: 10-bit offset for VFP load and store instructions |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%d", |
| instr->Bits(0, 8) << 2); |
| } else { |
| // 'off12: 12-bit offset for load and store instructions. |
| ASSERT(STRING_STARTS_WITH(format, "off12")); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%d", |
| instr->Offset12Field()); |
| } |
| return 5; |
| } |
| // 'off8: 8-bit offset for extra load and store instructions. |
| ASSERT(STRING_STARTS_WITH(format, "off8")); |
| int offs8 = (instr->ImmedHField() << 4) | instr->ImmedLField(); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%d", |
| offs8); |
| return 4; |
| } |
| case 'p': { // 'pu: P and U bits for load and store instructions. |
| ASSERT(STRING_STARTS_WITH(format, "pu")); |
| PrintPU(instr); |
| return 2; |
| } |
| case 'r': { |
| return FormatRegister(instr, format); |
| } |
| case 's': { |
| if (format[1] == 'h') { // 'shift_op or 'shift_rm |
| if (format[6] == 'o') { // 'shift_op |
| ASSERT(STRING_STARTS_WITH(format, "shift_op")); |
| if (instr->TypeField() == 0) { |
| PrintShiftRm(instr); |
| } else { |
| ASSERT(instr->TypeField() == 1); |
| PrintShiftImm(instr); |
| } |
| return 8; |
| } else { // 'shift_rm |
| ASSERT(STRING_STARTS_WITH(format, "shift_rm")); |
| PrintShiftRm(instr); |
| return 8; |
| } |
| } else if (format[1] == 'v') { // 'svc |
| ASSERT(STRING_STARTS_WITH(format, "svc")); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "0x%x", |
| instr->SvcField()); |
| return 3; |
| } else if (format[1] == 'z') { |
| // 'sz: Size field of SIMD instructions. |
| int sz = instr->Bits(20, 2); |
| char const* sz_str; |
| switch (sz) { |
| case 0: sz_str = "b"; break; |
| case 1: sz_str = "h"; break; |
| case 2: sz_str = "w"; break; |
| case 3: sz_str = "l"; break; |
| default: sz_str = "?"; break; |
| } |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%s", |
| sz_str); |
| return 2; |
| } else if (format[1] == ' ') { |
| // 's: S field of data processing instructions. |
| if (instr->HasS()) { |
| Print("s"); |
| } |
| return 1; |
| } else { |
| return FormatSRegister(instr, format); |
| } |
| } |
| case 't': { // 'target: target of branch instructions. |
| ASSERT(STRING_STARTS_WITH(format, "target")); |
| int off = (instr->SImmed24Field() << 2) + 8; |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| "%+d", |
| off); |
| return 6; |
| } |
| case 'u': { // 'u: signed or unsigned multiplies. |
| if (instr->Bit(22) == 0) { |
| Print("u"); |
| } else { |
| Print("s"); |
| } |
| return 1; |
| } |
| case 'w': { // 'w: W field of load and store instructions. |
| if (instr->HasW()) { |
| Print("!"); |
| } |
| return 1; |
| } |
| case 'x': { // 'x: type of extra load/store instructions. |
| if (!instr->HasSign()) { |
| Print("h"); |
| } else if (instr->HasL()) { |
| if (instr->HasH()) { |
| Print("sh"); |
| } else { |
| Print("sb"); |
| } |
| } else { |
| Print("d"); |
| } |
| return 1; |
| } |
| default: { |
| UNREACHABLE(); |
| break; |
| } |
| } |
| 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 ARMDecoder::Format(Instr* instr, const char* format) { |
| char cur = *format++; |
| while ((cur != 0) && (buffer_pos_ < (buffer_size_ - 1))) { |
| if (cur == '\'') { // Single quote is used as the formatting escape. |
| format += FormatOption(instr, format); |
| } else { |
| buffer_[buffer_pos_++] = cur; |
| } |
| cur = *format++; |
| } |
| buffer_[buffer_pos_] = '\0'; |
| } |
| |
| |
| // For currently unimplemented decodings the disassembler calls Unknown(instr) |
| // which will just print "unknown" of the instruction bits. |
| void ARMDecoder::Unknown(Instr* instr) { |
| Format(instr, "unknown"); |
| } |
| |
| |
| void ARMDecoder::DecodeType01(Instr* instr) { |
| if (!instr->IsDataProcessing()) { |
| // miscellaneous, multiply, sync primitives, extra loads and stores. |
| if (instr->IsMiscellaneous()) { |
| switch (instr->Bits(4, 3)) { |
| case 1: { |
| if (instr->Bits(21, 2) == 0x3) { |
| Format(instr, "clz'cond 'rd, 'rm"); |
| } else if (instr->Bits(21, 2) == 0x1) { |
| Format(instr, "bx'cond 'rm"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| case 3: { |
| if (instr->Bits(21, 2) == 0x1) { |
| Format(instr, "blx'cond 'rm"); |
| } else { |
| // Could be inlined constant. |
| Unknown(instr); |
| } |
| break; |
| } |
| case 7: { |
| if ((instr->Bits(21, 2) == 0x1) && (instr->ConditionField() == AL)) { |
| Format(instr, "bkpt #'imm12_4"); |
| if (instr->BkptField() == Instr::kStopMessageCode) { |
| const char* message = *reinterpret_cast<const char**>( |
| reinterpret_cast<intptr_t>(instr) - Instr::kInstrSize); |
| buffer_pos_ += OS::SNPrint(current_position_in_buffer(), |
| remaining_size_in_buffer(), |
| " ; \"%s\"", |
| message); |
| } |
| } else { |
| // Format(instr, "smc'cond"); |
| Unknown(instr); // Not used. |
| } |
| break; |
| } |
| default: { |
| Unknown(instr); // Not used. |
| break; |
| } |
| } |
| } else if (instr->IsMultiplyOrSyncPrimitive()) { |
| if (instr->Bit(24) == 0) { |
| // multiply instructions |
| switch (instr->Bits(21, 3)) { |
| case 0: { |
| // Assembler registers rd, rn, rm are encoded as rn, rm, rs. |
| Format(instr, "mul'cond's 'rn, 'rm, 'rs"); |
| break; |
| } |
| case 1: { |
| // Assembler registers rd, rn, rm, ra are encoded as rn, rm, rs, rd. |
| Format(instr, "mla'cond's 'rn, 'rm, 'rs, 'rd"); |
| break; |
| } |
| case 2: { |
| if (TargetCPUFeatures::arm_version() == ARMv5TE) { |
| Unknown(instr); |
| return; |
| } |
| // Registers rd_lo, rd_hi, rn, rm are encoded as rd, rn, rm, rs. |
| Format(instr, "umaal'cond's 'rd, 'rn, 'rm, 'rs"); |
| break; |
| } |
| case 3: { |
| if (TargetCPUFeatures::arm_version() != ARMv7) { |
| Unknown(instr); |
| return; |
| } |
| // Assembler registers rd, rn, rm, ra are encoded as rn, rm, rs, rd. |
| Format(instr, "mls'cond's 'rn, 'rm, 'rs, 'rd"); |
| break; |
| } |
| case 4: { |
| // Registers rd_lo, rd_hi, rn, rm are encoded as rd, rn, rm, rs. |
| Format(instr, "umull'cond's 'rd, 'rn, 'rm, 'rs"); |
| break; |
| } |
| case 5: { |
| // Registers rd_lo, rd_hi, rn, rm are encoded as rd, rn, rm, rs. |
| Format(instr, "umlal'cond's 'rd, 'rn, 'rm, 'rs"); |
| break; |
| } |
| case 6: { |
| // Registers rd_lo, rd_hi, rn, rm are encoded as rd, rn, rm, rs. |
| Format(instr, "smull'cond's 'rd, 'rn, 'rm, 'rs"); |
| break; |
| } |
| default: { |
| Unknown(instr); // Not used. |
| break; |
| } |
| } |
| } else { |
| if (TargetCPUFeatures::arm_version() == ARMv5TE) { |
| // strex and ldrex are only supported after ARMv6. |
| Unknown(instr); |
| return; |
| } |
| // synchronization primitives |
| switch (instr->Bits(20, 4)) { |
| case 8: { |
| Format(instr, "strex'cond 'rd, 'rm, ['rn]"); |
| break; |
| } |
| case 9: { |
| Format(instr, "ldrex'cond 'rd, ['rn]"); |
| break; |
| } |
| default: { |
| Unknown(instr); // Not used. |
| break; |
| } |
| } |
| } |
| } else if (instr->Bit(25) == 1) { |
| // 16-bit immediate loads, msr (immediate), and hints |
| switch (instr->Bits(20, 5)) { |
| case 16: { |
| if (TargetCPUFeatures::arm_version() == ARMv7) { |
| Format(instr, "movw'cond 'rd, #'imm4_12"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| case 18: { |
| if ((instr->Bits(16, 4) == 0) && (instr->Bits(0, 8) == 0)) { |
| Format(instr, "nop'cond"); |
| } else { |
| Unknown(instr); // Not used. |
| } |
| break; |
| } |
| case 20: { |
| if (TargetCPUFeatures::arm_version() == ARMv7) { |
| Format(instr, "movt'cond 'rd, #'imm4_12"); |
| } else { |
| Unknown(instr); |
| } |
| break; |
| } |
| default: { |
| Unknown(instr); // Not used. |
| break; |
| } |
| } |
| } else { |
| // extra load/store instructions |
| switch (instr->PUField()) { |
| case 0: { |
| if (instr->Bit(22) == 0) { |
| Format(instr, "'memop'cond'x 'rd2, ['rn], -'rm"); |
| } else { |
| Format(instr, "'memop'cond'x 'rd2, ['rn], #-'off8"); |
| } |
| break; |
| } |
| case 1: { |
| if (instr->Bit(22) == 0) { |
| Format(instr, "'memop'cond'x 'rd2, ['rn], +'rm"); |
| } else { |
| Format(instr, "'memop'cond'x 'rd2, ['rn], #+'off8"); |
| } |
| break; |
| } |
| case 2: { |
| if (instr->Bit(22) == 0) { |
| Format(instr, "'memop'cond'x 'rd2, ['rn, -'rm]'w"); |
| } else { |
| Format(instr, "'memop'cond'x 'rd2, ['rn, #-'off8]'w"); |
| } |
| break; |
| } |
| case 3: { |
| if (instr->Bit(22) == 0) { |
| Format(instr, "'memop'cond'x 'rd2, ['rn, +'rm]'w"); |
| } else { |
| Format(instr, "'memop'cond'x 'rd2, ['rn, #+'off8]'w"); |
| } |
| break; |
| } |
| default: { |
| // The PU field is a 2-bit field. |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| } else { |
| switch (instr->OpcodeField()) { |
| case AND: { |
| Format(instr, "and'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case EOR: { |
| Format(instr, "eor'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case SUB: { |
| Format(instr, "sub'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case RSB: { |
| Format(instr, "rsb'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case ADD: { |
| Format(instr, "add'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case ADC: { |
| Format(instr, "adc'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case SBC: { |
| Format(instr, "sbc'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case RSC: { |
| Format(instr, "rsc'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case TST: { |
| if (instr->HasS()) { |
| Format(instr, "tst'cond 'rn, 'shift_op"); |
| } else { |
| Unknown(instr); // Not used. |
| } |
| break; |
| } |
| case TEQ: { |
| if (instr->HasS()) { |
| Format(instr, "teq'cond 'rn, 'shift_op"); |
| } else { |
| Unknown(instr); // Not used. |
| } |
| break; |
| } |
| case CMP: { |
| if (instr->HasS()) { |
| Format(instr, "cmp'cond 'rn, 'shift_op"); |
| } else { |
| Unknown(instr); // Not used. |
| } |
| break; |
| } |
| case CMN: { |
| if (instr->HasS()) { |
| Format(instr, "cmn'cond 'rn, 'shift_op"); |
| } else { |
| Unknown(instr); // Not used. |
| } |
| break; |
| } |
| case ORR: { |
| Format(instr, "orr'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case MOV: { |
| Format(instr, "mov'cond's 'rd, 'shift_op"); |
| break; |
| } |
| case BIC: { |
| Format(instr, "bic'cond's 'rd, 'rn, 'shift_op"); |
| break; |
| } |
| case MVN: { |
| Format(instr, "mvn'cond's 'rd, 'shift_op"); |
| break; |
| } |
| default: { |
| // The Opcode field is a 4-bit field. |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| } |
| |
| |
| void ARMDecoder::DecodeType2(Instr* instr) { |
| switch (instr->PUField()) { |
| case 0: { |
| if (instr->HasW()) { |
| Unknown(instr); // Not used. |
| } else { |
| Format(instr, "'memop'cond'b 'rd, ['rn], #-'off12"); |
| } |
| break; |
| } |
| case 1: { |
| if (instr->HasW()) { |
| Unknown(instr); // Not used. |
| } else { |
| Format(instr, "'memop'cond'b 'rd, ['rn], #+'off12"); |
| } |
| break; |
| } |
| case 2: { |
| Format(instr, "'memop'cond'b 'rd, ['rn, #-'off12]'w"); |
| break; |
| } |
| case 3: { |
| Format(instr, "'memop'cond'b 'rd, ['rn, #+'off12]'w"); |
| break; |
| } |
| default: { |
| // The PU field is a 2-bit field. |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| |
| |
| void ARMDecoder::DecodeType3(Instr* instr) { |
| if (instr->IsDivision()) { |
| if (!TargetCPUFeatures::integer_division_supported()) { |
| Unknown(instr); |
| return; |
| } |
| if (instr->Bit(21)) { |
| Format(instr, "udiv'cond 'rn, 'rs, 'rm"); |
| } else { |
| Format(instr, "sdiv'cond 'rn, 'rs, 'rm"); |
| } |
| return; |
| } |
| switch (instr->PUField()) { |
| case 0: { |
| if (instr->HasW()) { |
| Unknown(instr); |
| } else { |
| Format(instr, "'memop'cond'b 'rd, ['rn], -'shift_rm"); |
| } |
| break; |
| } |
| case 1: { |
| if (instr->HasW()) { |
| Unknown(instr); |
| } else { |
| Format(instr, "'memop'cond'b 'rd, ['rn], +'shift_rm"); |
| } |
| break; |
| } |
| case 2: { |
| Format(instr, "'memop'cond'b 'rd, ['rn, -'shift_rm]'w"); |
| break; |
| } |
| case 3: { |
| Format(instr, "'memop'cond'b 'rd, ['rn, +'shift_rm]'w"); |
| break; |
| } |
| default: { |
| // The PU field is a 2-bit field. |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| |
| |
| void ARMDecoder::DecodeType4(Instr* instr) { |
| if (instr->Bit(22) == 1) { |
| Unknown(instr); // Privileged mode currently not supported. |
| } else if (instr->HasL()) { |
| Format(instr, "ldm'cond'pu 'rn'w, 'rlist"); |
| } else { |
| Format(instr, "stm'cond'pu 'rn'w, 'rlist"); |
| } |
| } |
| |
| |
| void ARMDecoder::DecodeType5(Instr* instr) { |
| Format(instr, "b'l'cond 'target ; 'dest"); |
| } |
| |
| |
| void ARMDecoder::DecodeType6(Instr* instr) { |
| if (instr->IsVFPDoubleTransfer()) { |
| if (instr->Bit(8) == 0) { |
| if (instr->Bit(20) == 1) { |
| Format(instr, "vmovrrs'cond 'rd, 'rn, {'sm, 'sm1}"); |
| } else { |
| Format(instr, "vmovsrr'cond {'sm, 'sm1}, 'rd, 'rn"); |
| } |
| } else { |
| if (instr->Bit(20) == 1) { |
| Format(instr, "vmovrrd'cond 'rd, 'rn, 'dm"); |
| } else { |
| Format(instr, "vmovdrr'cond 'dm, 'rd, 'rn"); |
| } |
| } |
| } else if (instr-> IsVFPLoadStore()) { |
| if (instr->Bit(8) == 0) { |
| if (instr->Bit(20) == 1) { // vldrs |
| if (instr->Bit(23) == 1) { |
| Format(instr, "vldrs'cond 'sd, ['rn, #+'off10]"); |
| } else { |
| Format(instr, "vldrs'cond 'sd, ['rn, #-'off10]"); |
| } |
| } else { // vstrs |
| if (instr->Bit(23) == 1) { |
| Format(instr, "vstrs'cond 'sd, ['rn, #+'off10]"); |
| } else { |
| Format(instr, "vstrs'cond 'sd, ['rn, #-'off10]"); |
| } |
| } |
| } else { |
| if (instr->Bit(20) == 1) { // vldrd |
| if (instr->Bit(23) == 1) { |
| Format(instr, "vldrd'cond 'dd, ['rn, #+'off10]"); |
| } else { |
| Format(instr, "vldrd'cond 'dd, ['rn, #-'off10]"); |
| } |
| } else { // vstrd |
| if (instr->Bit(23) == 1) { |
| Format(instr, "vstrd'cond 'dd, ['rn, #+'off10]"); |
| } else { |
| Format(instr, "vstrd'cond 'dd, ['rn, #-'off10]"); |
| } |
| } |
| } |
| } else if (instr->IsVFPMultipleLoadStore()) { |
| if (instr->HasL()) { // vldm |
| if (instr->Bit(8)) { // vldmd |
| Format(instr, "vldmd'cond'pu 'rn'w, 'dlist"); |
| } else { // vldms |
| Format(instr, "vldms'cond'pu 'rn'w, 'slist"); |
| } |
| } else { // vstm |
| if (instr->Bit(8)) { // vstmd |
| Format(instr, "vstmd'cond'pu 'rn'w, 'dlist"); |
| } else { // vstms |
| Format(instr, "vstms'cond'pu 'rn'w, 'slist"); |
| } |
| } |
| } else { |
| Unknown(instr); |
| } |
| } |
| |
| |
| void ARMDecoder::DecodeType7(Instr* instr) { |
| if (instr->Bit(24) == 1) { |
| Format(instr, "svc'cond #'svc"); |
| } else if (instr->IsVFPDataProcessingOrSingleTransfer()) { |
| if (instr->Bit(4) == 0) { |
| // VFP Data Processing |
| switch (instr->Bits(20, 4) & 0xb) { |
| case 0: { // vmla, vmls floating-point |
| if (instr->Bit(8) == 0) { |
| if (instr->Bit(6) == 0) { |
| Format(instr, "vmlas'cond 'sd, 'sn, 'sm"); |
| } else { |
| Format(instr, "vmlss'cond 'sd, 'sn, 'sm"); |
| } |
| } else { |
| if (instr->Bit(6) == 0) { |
| Format(instr, "vmlad'cond 'dd, 'dn, 'dm"); |
| } else { |
| Format(instr, "vmlsd'cond 'dd, 'dn, 'dm"); |
| } |
| } |
| break; |
| } |
| case 1: // vnmla, vnmls, vnmul |
| default: { |
| Unknown(instr); |
| break; |
| } |
| case 2: { // vmul |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vmuls'cond 'sd, 'sn, 'sm"); |
| } else { |
| Format(instr, "vmuld'cond 'dd, 'dn, 'dm"); |
| } |
| break; |
| } |
| case 8: { // vdiv |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vdivs'cond 'sd, 'sn, 'sm"); |
| } else { |
| Format(instr, "vdivd'cond 'dd, 'dn, 'dm"); |
| } |
| break; |
| } |
| case 3: { // vadd, vsub floating-point |
| if (instr->Bit(8) == 0) { |
| if (instr->Bit(6) == 0) { |
| Format(instr, "vadds'cond 'sd, 'sn, 'sm"); |
| } else { |
| Format(instr, "vsubs'cond 'sd, 'sn, 'sm"); |
| } |
| } else { |
| if (instr->Bit(6) == 0) { |
| Format(instr, "vaddd'cond 'dd, 'dn, 'dm"); |
| } else { |
| Format(instr, "vsubd'cond 'dd, 'dn, 'dm"); |
| } |
| } |
| break; |
| } |
| case 0xb: { // Other VFP data-processing instructions |
| if (instr->Bit(6) == 0) { // vmov immediate |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vmovs'cond 'sd, #'immf"); |
| } else { |
| Format(instr, "vmovd'cond 'dd, #'immd"); |
| } |
| break; |
| } |
| switch (instr->Bits(16, 4)) { |
| case 0: { // vmov register, vabs |
| switch (instr->Bits(6, 2)) { |
| case 1: { // vmov register |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vmovs'cond 'sd, 'sm"); |
| } else { |
| Format(instr, "vmovd'cond 'dd, 'dm"); |
| } |
| break; |
| } |
| case 3: { // vabs |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vabss'cond 'sd, 'sm"); |
| } else { |
| Format(instr, "vabsd'cond 'dd, 'dm"); |
| } |
| break; |
| } |
| default: { |
| Unknown(instr); |
| break; |
| } |
| } |
| break; |
| } |
| case 1: { // vneg, vsqrt |
| switch (instr->Bits(6, 2)) { |
| case 1: { // vneg |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vnegs'cond 'sd, 'sm"); |
| } else { |
| Format(instr, "vnegd'cond 'dd, 'dm"); |
| } |
| break; |
| } |
| case 3: { // vsqrt |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vsqrts'cond 'sd, 'sm"); |
| } else { |
| Format(instr, "vsqrtd'cond 'dd, 'dm"); |
| } |
| break; |
| } |
| default: { |
| Unknown(instr); |
| break; |
| } |
| } |
| break; |
| } |
| case 4: // vcmp, vcmpe |
| case 5: { // vcmp #0.0, vcmpe #0.0 |
| if (instr->Bit(7) == 1) { // vcmpe |
| Unknown(instr); |
| } else { |
| if (instr->Bit(8) == 0) { // vcmps |
| if (instr->Bit(16) == 0) { |
| Format(instr, "vcmps'cond 'sd, 'sm"); |
| } else { |
| Format(instr, "vcmps'cond 'sd, #0.0"); |
| } |
| } else { // vcmpd |
| if (instr->Bit(16) == 0) { |
| Format(instr, "vcmpd'cond 'dd, 'dm"); |
| } else { |
| Format(instr, "vcmpd'cond 'dd, #0.0"); |
| } |
| } |
| } |
| break; |
| } |
| case 7: { // vcvt between double-precision and single-precision |
| if (instr->Bit(8) == 0) { |
| Format(instr, "vcvtds'cond 'dd, 'sm"); |
| } else { |
| Format(instr, "vcvtsd'cond 'sd, 'dm"); |
| } |
| break; |
| } |
| case 8: { // vcvt, vcvtr between floating-point and integer |
| if (instr->Bit(8) == 0) { |
| if (instr->Bit(7) == 0) { |
| Format(instr, "vcvtsu'cond 'sd, 'sm"); |
| } else { |
| Format(instr, "vcvtsi'cond 'sd, 'sm"); |
| } |
| } else { |
| if (instr->Bit(7) == 0) { |
| Format(instr, "vcvtdu'cond 'dd, 'sm"); |
| } else { |
| Format(instr, "vcvtdi'cond 'dd, 'sm"); |
| } |
| } |
| break; |
| } |
| case 12: |
| case 13: { // vcvt, vcvtr between floating-point and integer |
| if (instr->Bit(7) == 0) { |
| // We only support round-to-zero mode |
| Unknown(instr); |
| break; |
| } |
| if (instr->Bit(8) == 0) { |
| if (instr->Bit(16) == 0) { |
| Format(instr, "vcvtus'cond 'sd, 'sm"); |
| } else { |
| Format(instr, "vcvtis'cond 'sd, 'sm"); |
| } |
| } else { |
| if (instr->Bit(16) == 0) { |
| Format(instr, "vcvtud'cond 'sd, 'dm"); |
| } else { |
| Format(instr, "vcvtid'cond 'sd, 'dm"); |
| } |
| } |
| break; |
| } |
| case 2: // vcvtb, vcvtt |
| case 3: // vcvtb, vcvtt |
| case 9: // undefined |
| case 10: // vcvt between floating-point and fixed-point |
| case 11: // vcvt between floating-point and fixed-point |
| case 14: // vcvt between floating-point and fixed-point |
| case 15: // vcvt between floating-point and fixed-point |
| default: { |
| Unknown(instr); |
| break; |
| } |
| } |
| } |
| break; |
| } |
| } else { |
| // 8, 16, or 32-bit Transfer between ARM Core and VFP |
| if ((instr->Bits(21, 3) == 0) && (instr->Bit(8) == 0)) { |
| if (instr->Bit(20) == 0) { |
| Format(instr, "vmovs'cond 'sn, 'rd"); |
| } else { |
| Format(instr, "vmovr'cond 'rd, 'sn"); |
| } |
| } else if ((instr->Bits(22, 3) == 0) && (instr->Bit(20) == 0) && |
| (instr->Bit(8) == 1) && (instr->Bits(5, 2) == 0)) { |
| if (instr->Bit(21) == 0) { |
| Format(instr, "vmovd'cond 'dn[0], 'rd"); |
| } else { |
| Format(instr, "vmovd'cond 'dn[1], 'rd"); |
| } |
| } else if ((instr->Bits(20, 4) == 0xf) && (instr->Bit(8) == 0)) { |
| if (instr->Bits(12, 4) == 0xf) { |
| Format(instr, "vmrs'cond APSR, FPSCR"); |
| } else { |
| Format(instr, "vmrs'cond 'rd, FPSCR"); |
| } |
| } else { |
| Unknown(instr); |
| } |
| } |
| } else { |
| Unknown(instr); |
| } |
| } |
| |
| |
| void ARMDecoder::DecodeSIMDDataProcessing(Instr* instr) { |
| ASSERT(instr->ConditionField() == kSpecialCondition); |
| if (instr->Bit(6) == 1) { |
| if ((instr->Bits(8, 4) == 8) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vaddq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 13) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 2) == 0) && (instr->Bit(21) == 0)) { |
| Format(instr, "vaddqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 8) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 2) == 2)) { |
| Format(instr, "vsubq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 13) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 2) == 0) && (instr->Bit(21) == 1)) { |
| Format(instr, "vsubqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 9) && (instr->Bit(4) == 1) && |
| (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vmulq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 13) && (instr->Bit(4) == 1) && |
| (instr->Bits(23, 2) == 2) && (instr->Bit(21) == 0)) { |
| Format(instr, "vmulqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 4) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 5) == 4)) { |
| Format(instr, "vshlqi'sz 'qd, 'qm, 'qn"); |
| } else if ((instr->Bits(8, 4) == 4) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 5) == 6)) { |
| Format(instr, "vshlqu'sz 'qd, 'qm, 'qn"); |
| } else if ((instr->Bits(8, 4) == 1) && (instr->Bit(4) == 1) && |
| (instr->Bits(20, 2) == 0) && (instr->Bits(23, 2) == 2)) { |
| Format(instr, "veorq 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 1) && (instr->Bit(4) == 1) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vornq 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 1) && (instr->Bit(4) == 1) && |
| (instr->Bits(20, 2) == 2) && (instr->Bits(23, 2) == 0)) { |
| if (instr->QmField() == instr->QnField()) { |
| Format(instr, "vmovq 'qd, 'qm"); |
| } else { |
| Format(instr, "vorrq 'qd, 'qm"); |
| } |
| } else if ((instr->Bits(8, 4) == 1) && (instr->Bit(4) == 1) && |
| (instr->Bits(20, 2) == 0) && (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vandq 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(7, 5) == 11) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 5) == 7) && |
| (instr->Bits(16, 4) == 0)) { |
| Format(instr, "vmvnq 'qd, 'qm"); |
| } else if ((instr->Bits(8, 4) == 15) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 2) && (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vminqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 15) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 0) && (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vmaxqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 7) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 2) == 3) && |
| (instr->Bit(7) == 0) && (instr->Bits(16, 4) == 9)) { |
| Format(instr, "vabsqs 'qd, 'qm"); |
| } else if ((instr->Bits(8, 4) == 7) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 2) == 3) && |
| (instr->Bit(7) == 1) && (instr->Bits(16, 4) == 9)) { |
| Format(instr, "vnegqs 'qd, 'qm"); |
| } else if ((instr->Bits(7, 5) == 10) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 2) == 3) && |
| (instr->Bits(16, 4) == 11)) { |
| Format(instr, "vrecpeqs 'qd, 'qm"); |
| } else if ((instr->Bits(8, 4) == 15) && (instr->Bit(4) == 1) && |
| (instr->Bits(20, 2) == 0) && (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vrecpsqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 5) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 2) == 3) && |
| (instr->Bit(7) == 1) && (instr->Bits(16, 4) == 11)) { |
| Format(instr, "vrsqrteqs 'qd, 'qm"); |
| } else if ((instr->Bits(8, 4) == 15) && (instr->Bit(4) == 1) && |
| (instr->Bits(20, 2) == 2) && (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vrsqrtsqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 12) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 2) == 3) && |
| (instr->Bit(7) == 0)) { |
| int32_t imm4 = instr->Bits(16, 4); |
| if (imm4 & 1) { |
| Format(instr, "vdupb 'qd, 'dm['imm4_vdup]"); |
| } else if (imm4 & 2) { |
| Format(instr, "vduph 'qd, 'dm['imm4_vdup]"); |
| } else if (imm4 & 4) { |
| Format(instr, "vdupw 'qd, 'dm['imm4_vdup]"); |
| } else { |
| Unknown(instr); |
| } |
| } else if ((instr->Bits(8, 4) == 1) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 3) && (instr->Bits(23, 2) == 3) && |
| (instr->Bit(7) == 1) && (instr->Bits(16, 4) == 10)) { |
| Format(instr, "vzipqw 'qd, 'qm"); |
| } else if ((instr->Bits(8, 4) == 8) && (instr->Bit(4) == 1) && |
| (instr->Bits(23, 2) == 2)) { |
| Format(instr, "vceqq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 14) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 0) && (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vceqqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 3) && (instr->Bit(4) == 1) && |
| (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vcgeq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 3) && (instr->Bit(4) == 1) && |
| (instr->Bits(23, 2) == 2)) { |
| Format(instr, "vcugeq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 14) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 0) && (instr->Bits(23, 2) == 2)) { |
| Format(instr, "vcgeqs 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 3) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 2) == 0)) { |
| Format(instr, "vcgtq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 3) && (instr->Bit(4) == 0) && |
| (instr->Bits(23, 2) == 2)) { |
| Format(instr, "vcugtq'sz 'qd, 'qn, 'qm"); |
| } else if ((instr->Bits(8, 4) == 14) && (instr->Bit(4) == 0) && |
| (instr->Bits(20, 2) == 2) && (instr->Bits(23, 2) == 2)) { |
| Format(instr, "vcgtqs 'qd, 'qn, 'qm"); |
| } else { |
| Unknown(instr); |
| } |
| } else { |
| if ((instr->Bits(23, 2) == 3) && (instr->Bits(20, 2) == 3) && |
| (instr->Bits(10, 2) == 2) && (instr->Bit(4) == 0)) { |
| Format(instr, "vtbl 'dd, 'dtbllist, 'dm"); |
| } else { |
| Unknown(instr); |
| } |
| } |
| } |
| |
| |
| void ARMDecoder::InstructionDecode(uword pc) { |
| Instr* instr = Instr::At(pc); |
| |
| if (instr->ConditionField() == kSpecialCondition) { |
| if ((instr->InstructionBits() == static_cast<int32_t>(0xf57ff01f)) && |
| (TargetCPUFeatures::arm_version() != ARMv5TE)) { |
| Format(instr, "clrex"); |
| } else { |
| if (instr->IsSIMDDataProcessing()) { |
| DecodeSIMDDataProcessing(instr); |
| } else { |
| Unknown(instr); |
| } |
| } |
| } else { |
| switch (instr->TypeField()) { |
| case 0: |
| case 1: { |
| DecodeType01(instr); |
| break; |
| } |
| case 2: { |
| DecodeType2(instr); |
| break; |
| } |
| case 3: { |
| DecodeType3(instr); |
| break; |
| } |
| case 4: { |
| DecodeType4(instr); |
| break; |
| } |
| case 5: { |
| DecodeType5(instr); |
| break; |
| } |
| case 6: { |
| DecodeType6(instr); |
| break; |
| } |
| case 7: { |
| DecodeType7(instr); |
| break; |
| } |
| default: { |
| // The type field is 3-bits in the ARM encoding. |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| } |
| |
| |
| void Disassembler::DecodeInstruction(char* hex_buffer, intptr_t hex_size, |
| char* human_buffer, intptr_t human_size, |
| int* out_instr_size, uword pc) { |
| ARMDecoder decoder(human_buffer, human_size); |
| decoder.InstructionDecode(pc); |
| int32_t instruction_bits = Instr::At(pc)->InstructionBits(); |
| OS::SNPrint(hex_buffer, hex_size, "%08x", instruction_bits); |
| if (out_instr_size) { |
| *out_instr_size = Instr::kInstrSize; |
| } |
| } |
| |
| } // namespace dart |
| |
| #endif // defined TARGET_ARCH_ARM |
