| //===-- HexagonDisassembler.cpp - Disassembler for Hexagon ISA ------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Hexagon.h" |
| #include "MCTargetDesc/HexagonBaseInfo.h" |
| #include "MCTargetDesc/HexagonMCInstrInfo.h" |
| #include "MCTargetDesc/HexagonMCTargetDesc.h" |
| |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCDisassembler.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCFixedLenDisassembler.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/MC/MCInstrDesc.h" |
| #include "llvm/MC/MCSubtargetInfo.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/Endian.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/LEB128.h" |
| #include "llvm/Support/TargetRegistry.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <array> |
| #include <vector> |
| |
| using namespace llvm; |
| using namespace Hexagon; |
| |
| #define DEBUG_TYPE "hexagon-disassembler" |
| |
| // Pull DecodeStatus and its enum values into the global namespace. |
| typedef llvm::MCDisassembler::DecodeStatus DecodeStatus; |
| |
| namespace { |
| /// \brief Hexagon disassembler for all Hexagon platforms. |
| class HexagonDisassembler : public MCDisassembler { |
| public: |
| std::unique_ptr<MCInst *> CurrentBundle; |
| HexagonDisassembler(MCSubtargetInfo const &STI, MCContext &Ctx) |
| : MCDisassembler(STI, Ctx), CurrentBundle(new MCInst *) {} |
| |
| DecodeStatus getSingleInstruction(MCInst &Instr, MCInst &MCB, |
| ArrayRef<uint8_t> Bytes, uint64_t Address, |
| raw_ostream &VStream, raw_ostream &CStream, |
| bool &Complete) const; |
| DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size, |
| ArrayRef<uint8_t> Bytes, uint64_t Address, |
| raw_ostream &VStream, |
| raw_ostream &CStream) const override; |
| }; |
| } |
| |
| static DecodeStatus DecodeModRegsRegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t Address, const void *Decoder); |
| static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t Address, const void *Decoder); |
| static DecodeStatus DecodeCtrRegs64RegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t Address, void const *Decoder); |
| |
| static const uint16_t IntRegDecoderTable[] = { |
| Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4, |
| Hexagon::R5, Hexagon::R6, Hexagon::R7, Hexagon::R8, Hexagon::R9, |
| Hexagon::R10, Hexagon::R11, Hexagon::R12, Hexagon::R13, Hexagon::R14, |
| Hexagon::R15, Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19, |
| Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23, Hexagon::R24, |
| Hexagon::R25, Hexagon::R26, Hexagon::R27, Hexagon::R28, Hexagon::R29, |
| Hexagon::R30, Hexagon::R31 }; |
| |
| static const uint16_t PredRegDecoderTable[] = { Hexagon::P0, Hexagon::P1, |
| Hexagon::P2, Hexagon::P3 }; |
| |
| static DecodeStatus DecodeRegisterClass(MCInst &Inst, unsigned RegNo, |
| const uint16_t Table[], size_t Size) { |
| if (RegNo < Size) { |
| Inst.addOperand(MCOperand::createReg(Table[RegNo])); |
| return MCDisassembler::Success; |
| } |
| else |
| return MCDisassembler::Fail; |
| } |
| |
| static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t /*Address*/, |
| void const *Decoder) { |
| if (RegNo > 31) |
| return MCDisassembler::Fail; |
| |
| unsigned Register = IntRegDecoderTable[RegNo]; |
| Inst.addOperand(MCOperand::createReg(Register)); |
| return MCDisassembler::Success; |
| } |
| |
| static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t /*Address*/, const void *Decoder) { |
| static const uint16_t CtrlRegDecoderTable[] = { |
| Hexagon::SA0, Hexagon::LC0, Hexagon::SA1, Hexagon::LC1, |
| Hexagon::P3_0, Hexagon::NoRegister, Hexagon::C6, Hexagon::C7, |
| Hexagon::USR, Hexagon::PC, Hexagon::UGP, Hexagon::GP, |
| Hexagon::CS0, Hexagon::CS1, Hexagon::UPCL, Hexagon::UPCH |
| }; |
| |
| if (RegNo >= sizeof(CtrlRegDecoderTable) / sizeof(CtrlRegDecoderTable[0])) |
| return MCDisassembler::Fail; |
| |
| if (CtrlRegDecoderTable[RegNo] == Hexagon::NoRegister) |
| return MCDisassembler::Fail; |
| |
| unsigned Register = CtrlRegDecoderTable[RegNo]; |
| Inst.addOperand(MCOperand::createReg(Register)); |
| return MCDisassembler::Success; |
| } |
| |
| static DecodeStatus DecodeCtrRegs64RegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t /*Address*/, void const *Decoder) { |
| static const uint16_t CtrlReg64DecoderTable[] = { |
| Hexagon::C1_0, Hexagon::NoRegister, |
| Hexagon::C3_2, Hexagon::NoRegister, |
| Hexagon::NoRegister, Hexagon::NoRegister, |
| Hexagon::C7_6, Hexagon::NoRegister, |
| Hexagon::C9_8, Hexagon::NoRegister, |
| Hexagon::C11_10, Hexagon::NoRegister, |
| Hexagon::CS, Hexagon::NoRegister, |
| Hexagon::UPC, Hexagon::NoRegister |
| }; |
| |
| if (RegNo >= sizeof(CtrlReg64DecoderTable) / sizeof(CtrlReg64DecoderTable[0])) |
| return MCDisassembler::Fail; |
| |
| if (CtrlReg64DecoderTable[RegNo] == Hexagon::NoRegister) |
| return MCDisassembler::Fail; |
| |
| unsigned Register = CtrlReg64DecoderTable[RegNo]; |
| Inst.addOperand(MCOperand::createReg(Register)); |
| return MCDisassembler::Success; |
| } |
| |
| static DecodeStatus DecodeModRegsRegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t /*Address*/, const void *Decoder) { |
| unsigned Register = 0; |
| switch (RegNo) { |
| case 0: |
| Register = Hexagon::M0; |
| break; |
| case 1: |
| Register = Hexagon::M1; |
| break; |
| default: |
| return MCDisassembler::Fail; |
| } |
| Inst.addOperand(MCOperand::createReg(Register)); |
| return MCDisassembler::Success; |
| } |
| |
| static DecodeStatus DecodeDoubleRegsRegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t /*Address*/, const void *Decoder) { |
| static const uint16_t DoubleRegDecoderTable[] = { |
| Hexagon::D0, Hexagon::D1, Hexagon::D2, Hexagon::D3, |
| Hexagon::D4, Hexagon::D5, Hexagon::D6, Hexagon::D7, |
| Hexagon::D8, Hexagon::D9, Hexagon::D10, Hexagon::D11, |
| Hexagon::D12, Hexagon::D13, Hexagon::D14, Hexagon::D15 |
| }; |
| |
| return (DecodeRegisterClass(Inst, RegNo >> 1, |
| DoubleRegDecoderTable, |
| sizeof (DoubleRegDecoderTable))); |
| } |
| |
| static DecodeStatus DecodePredRegsRegisterClass(MCInst &Inst, unsigned RegNo, |
| uint64_t /*Address*/, |
| void const *Decoder) { |
| if (RegNo > 3) |
| return MCDisassembler::Fail; |
| |
| unsigned Register = PredRegDecoderTable[RegNo]; |
| Inst.addOperand(MCOperand::createReg(Register)); |
| return MCDisassembler::Success; |
| } |
| |
| #include "HexagonGenDisassemblerTables.inc" |
| |
| static MCDisassembler *createHexagonDisassembler(Target const &T, |
| MCSubtargetInfo const &STI, |
| MCContext &Ctx) { |
| return new HexagonDisassembler(STI, Ctx); |
| } |
| |
| extern "C" void LLVMInitializeHexagonDisassembler() { |
| TargetRegistry::RegisterMCDisassembler(TheHexagonTarget, |
| createHexagonDisassembler); |
| } |
| |
| DecodeStatus HexagonDisassembler::getInstruction(MCInst &MI, uint64_t &Size, |
| ArrayRef<uint8_t> Bytes, |
| uint64_t Address, |
| raw_ostream &os, |
| raw_ostream &cs) const { |
| DecodeStatus Result = DecodeStatus::Success; |
| bool Complete = false; |
| Size = 0; |
| |
| *CurrentBundle = &MI; |
| MI.setOpcode(Hexagon::BUNDLE); |
| MI.addOperand(MCOperand::createImm(0)); |
| while (Result == Success && Complete == false) |
| { |
| if (Bytes.size() < HEXAGON_INSTR_SIZE) |
| return MCDisassembler::Fail; |
| MCInst * Inst = new (getContext()) MCInst; |
| Result = getSingleInstruction(*Inst, MI, Bytes, Address, os, cs, Complete); |
| MI.addOperand(MCOperand::createInst(Inst)); |
| Size += HEXAGON_INSTR_SIZE; |
| Bytes = Bytes.slice(HEXAGON_INSTR_SIZE); |
| } |
| return Result; |
| } |
| |
| DecodeStatus HexagonDisassembler::getSingleInstruction( |
| MCInst &MI, MCInst &MCB, ArrayRef<uint8_t> Bytes, uint64_t Address, |
| raw_ostream &os, raw_ostream &cs, bool &Complete) const { |
| assert(Bytes.size() >= HEXAGON_INSTR_SIZE); |
| |
| uint32_t Instruction = |
| llvm::support::endian::read<uint32_t, llvm::support::little, |
| llvm::support::unaligned>(Bytes.data()); |
| |
| auto BundleSize = HexagonMCInstrInfo::bundleSize(MCB); |
| if ((Instruction & HexagonII::INST_PARSE_MASK) == |
| HexagonII::INST_PARSE_LOOP_END) { |
| if (BundleSize == 0) |
| HexagonMCInstrInfo::setInnerLoop(MCB); |
| else if (BundleSize == 1) |
| HexagonMCInstrInfo::setOuterLoop(MCB); |
| else |
| return DecodeStatus::Fail; |
| } |
| |
| DecodeStatus Result = DecodeStatus::Success; |
| if ((Instruction & HexagonII::INST_PARSE_MASK) == |
| HexagonII::INST_PARSE_PACKET_END) |
| Complete = true; |
| // Calling the auto-generated decoder function. |
| Result = |
| decodeInstruction(DecoderTable32, MI, Instruction, Address, this, STI); |
| |
| return Result; |
| } |