//===-- 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 #include 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 CurrentBundle; HexagonDisassembler(MCSubtargetInfo const &STI, MCContext &Ctx) : MCDisassembler(STI, Ctx), CurrentBundle(new MCInst *) {} DecodeStatus getSingleInstruction(MCInst &Instr, MCInst &MCB, ArrayRef Bytes, uint64_t Address, raw_ostream &VStream, raw_ostream &CStream, bool &Complete) const; DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size, ArrayRef 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 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 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(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; }