X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FMips%2FDisassembler%2FMipsDisassembler.cpp;h=c8a5195e8e6863686722f4daf6c50d4acee3ac5a;hb=3c537720006f52b105357d29d17c05af79b6c72b;hp=78dbc0694902bd102cdec5dd763f49f870a5e87f;hpb=ecdc9d5bb26936a68060f1238abc6c1d6b3c2a01;p=oota-llvm.git diff --git a/lib/Target/Mips/Disassembler/MipsDisassembler.cpp b/lib/Target/Mips/Disassembler/MipsDisassembler.cpp index 78dbc069490..c8a5195e8e6 100644 --- a/lib/Target/Mips/Disassembler/MipsDisassembler.cpp +++ b/lib/Target/Mips/Disassembler/MipsDisassembler.cpp @@ -12,150 +12,128 @@ //===----------------------------------------------------------------------===// #include "Mips.h" +#include "MipsRegisterInfo.h" #include "MipsSubtarget.h" -#include "llvm/MC/EDInstInfo.h" +#include "llvm/MC/MCContext.h" #include "llvm/MC/MCDisassembler.h" -#include "llvm/Support/MemoryObject.h" -#include "llvm/Support/TargetRegistry.h" -#include "llvm/MC/MCSubtargetInfo.h" +#include "llvm/MC/MCFixedLenDisassembler.h" #include "llvm/MC/MCInst.h" -#include "llvm/MC/MCRegisterInfo.h" +#include "llvm/MC/MCSubtargetInfo.h" #include "llvm/Support/MathExtras.h" - - -#include "MipsGenEDInfo.inc" +#include "llvm/Support/TargetRegistry.h" using namespace llvm; +#define DEBUG_TYPE "mips-disassembler" + typedef MCDisassembler::DecodeStatus DecodeStatus; -/// MipsDisassembler - a disasembler class for Mips32. -class MipsDisassembler : public MCDisassembler { -public: - /// Constructor - Initializes the disassembler. - /// - MipsDisassembler(const MCSubtargetInfo &STI, bool bigEndian) : - MCDisassembler(STI), isBigEndian(bigEndian) { - } +namespace { - ~MipsDisassembler() { - } +/// A disassembler class for Mips. +class MipsDisassemblerBase : public MCDisassembler { +public: + MipsDisassemblerBase(const MCSubtargetInfo &STI, MCContext &Ctx, + bool IsBigEndian) + : MCDisassembler(STI, Ctx), + IsGP64Bit(STI.getFeatureBits() & Mips::FeatureGP64Bit), + IsBigEndian(IsBigEndian) {} - /// getInstruction - See MCDisassembler. - DecodeStatus getInstruction(MCInst &instr, - uint64_t &size, - const MemoryObject ®ion, - uint64_t address, - raw_ostream &vStream, - raw_ostream &cStream) const; + virtual ~MipsDisassemblerBase() {} - /// getEDInfo - See MCDisassembler. - const EDInstInfo *getEDInfo() const; + bool isGP64Bit() const { return IsGP64Bit; } private: - bool isBigEndian; + bool IsGP64Bit; +protected: + bool IsBigEndian; }; - -/// Mips64Disassembler - a disasembler class for Mips64. -class Mips64Disassembler : public MCDisassembler { +/// A disassembler class for Mips32. +class MipsDisassembler : public MipsDisassemblerBase { + bool IsMicroMips; public: - /// Constructor - Initializes the disassembler. - /// - Mips64Disassembler(const MCSubtargetInfo &STI, bool bigEndian) : - MCDisassembler(STI), isBigEndian(bigEndian) { + MipsDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx, bool bigEndian) + : MipsDisassemblerBase(STI, Ctx, bigEndian) { + IsMicroMips = STI.getFeatureBits() & Mips::FeatureMicroMips; } - ~Mips64Disassembler() { + bool hasMips3() const { return STI.getFeatureBits() & Mips::FeatureMips3; } + bool hasMips32() const { return STI.getFeatureBits() & Mips::FeatureMips32; } + bool hasMips32r6() const { + return STI.getFeatureBits() & Mips::FeatureMips32r6; } - /// getInstruction - See MCDisassembler. - DecodeStatus getInstruction(MCInst &instr, - uint64_t &size, - const MemoryObject ®ion, - uint64_t address, - raw_ostream &vStream, - raw_ostream &cStream) const; - - /// getEDInfo - See MCDisassembler. - const EDInstInfo *getEDInfo() const; - -private: - bool isBigEndian; -}; - -const EDInstInfo *MipsDisassembler::getEDInfo() const { - return instInfoMips; -} - -const EDInstInfo *Mips64Disassembler::getEDInfo() const { - return instInfoMips; -} - -// Decoder tables for Mips register -static const unsigned CPURegsTable[] = { - Mips::ZERO, Mips::AT, Mips::V0, Mips::V1, - Mips::A0, Mips::A1, Mips::A2, Mips::A3, - Mips::T0, Mips::T1, Mips::T2, Mips::T3, - Mips::T4, Mips::T5, Mips::T6, Mips::T7, - Mips::S0, Mips::S1, Mips::S2, Mips::S3, - Mips::S4, Mips::S5, Mips::S6, Mips::S7, - Mips::T8, Mips::T9, Mips::K0, Mips::K1, - Mips::GP, Mips::SP, Mips::FP, Mips::RA -}; + bool isGP64() const { return STI.getFeatureBits() & Mips::FeatureGP64Bit; } -static const unsigned FGR32RegsTable[] = { - Mips::F0, Mips::F1, Mips::F2, Mips::F3, - Mips::F4, Mips::F5, Mips::F6, Mips::F7, - Mips::F8, Mips::F9, Mips::F10, Mips::F11, - Mips::F12, Mips::F13, Mips::F14, Mips::F15, - Mips::F16, Mips::F17, Mips::F18, Mips::F18, - Mips::F20, Mips::F21, Mips::F22, Mips::F23, - Mips::F24, Mips::F25, Mips::F26, Mips::F27, - Mips::F28, Mips::F29, Mips::F30, Mips::F31 -}; + bool hasCOP3() const { + // Only present in MIPS-I and MIPS-II + return !hasMips32() && !hasMips3(); + } -static const unsigned CPU64RegsTable[] = { - Mips::ZERO_64, Mips::AT_64, Mips::V0_64, Mips::V1_64, - Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64, - Mips::T0_64, Mips::T1_64, Mips::T2_64, Mips::T3_64, - Mips::T4_64, Mips::T5_64, Mips::T6_64, Mips::T7_64, - Mips::S0_64, Mips::S1_64, Mips::S2_64, Mips::S3_64, - Mips::S4_64, Mips::S5_64, Mips::S6_64, Mips::S7_64, - Mips::T8_64, Mips::T9_64, Mips::K0_64, Mips::K1_64, - Mips::GP_64, Mips::SP_64, Mips::FP_64, Mips::RA_64 + DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size, + ArrayRef Bytes, uint64_t Address, + raw_ostream &VStream, + raw_ostream &CStream) const override; }; -static const unsigned FGR64RegsTable[] = { - Mips::D0_64, Mips::D1_64, Mips::D2_64, Mips::D3_64, - Mips::D4_64, Mips::D5_64, Mips::D6_64, Mips::D7_64, - Mips::D8_64, Mips::D9_64, Mips::D10_64, Mips::D11_64, - Mips::D12_64, Mips::D13_64, Mips::D14_64, Mips::D15_64, - Mips::D16_64, Mips::D17_64, Mips::D18_64, Mips::D19_64, - Mips::D20_64, Mips::D21_64, Mips::D22_64, Mips::D23_64, - Mips::D24_64, Mips::D25_64, Mips::D26_64, Mips::D27_64, - Mips::D28_64, Mips::D29_64, Mips::D30_64, Mips::D31_64 +/// A disassembler class for Mips64. +class Mips64Disassembler : public MipsDisassemblerBase { +public: + Mips64Disassembler(const MCSubtargetInfo &STI, MCContext &Ctx, + bool bigEndian) : + MipsDisassemblerBase(STI, Ctx, bigEndian) {} + + DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size, + ArrayRef Bytes, uint64_t Address, + raw_ostream &VStream, + raw_ostream &CStream) const override; }; -static const unsigned AFGR64RegsTable[] = { - Mips::D0, Mips::D1, Mips::D2, Mips::D3, - Mips::D4, Mips::D5, Mips::D6, Mips::D7, - Mips::D8, Mips::D9, Mips::D10, Mips::D11, - Mips::D12, Mips::D13, Mips::D14, Mips::D15 -}; +} // end anonymous namespace // Forward declare these because the autogenerated code will reference them. // Definitions are further down. -static DecodeStatus DecodeCPU64RegsRegisterClass(MCInst &Inst, +static DecodeStatus DecodeGPR64RegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeCPU16RegsRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder); -static DecodeStatus DecodeCPURegsRegisterClass(MCInst &Inst, +static DecodeStatus DecodeGPRMM16RegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeGPRMM16ZeroRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeGPRMM16MovePRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeGPR32RegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodePtrRegisterClass(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeDSPRRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + static DecodeStatus DecodeFGR64RegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, @@ -171,6 +149,15 @@ static DecodeStatus DecodeCCRRegisterClass(MCInst &Inst, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeFCCRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeFGRCCRegisterClass(MCInst &Inst, unsigned RegNo, + uint64_t Address, + const void *Decoder); + static DecodeStatus DecodeHWRegsRegisterClass(MCInst &Inst, unsigned Insn, uint64_t Address, @@ -181,45 +168,209 @@ static DecodeStatus DecodeAFGR64RegisterClass(MCInst &Inst, uint64_t Address, const void *Decoder); -static DecodeStatus DecodeHWRegs64RegisterClass(MCInst &Inst, - unsigned Insn, +static DecodeStatus DecodeACC64DSPRegisterClass(MCInst &Inst, + unsigned RegNo, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeHI32DSPRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeLO32DSPRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMSA128BRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMSA128HRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMSA128WRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMSA128DRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMSACtrlRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeCOP2RegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); + static DecodeStatus DecodeBranchTarget(MCInst &Inst, unsigned Offset, uint64_t Address, const void *Decoder); -static DecodeStatus DecodeBC1(MCInst &Inst, - unsigned Insn, - uint64_t Address, - const void *Decoder); - - static DecodeStatus DecodeJumpTarget(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeBranchTarget21(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeBranchTarget26(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder); + +// DecodeBranchTarget7MM - Decode microMIPS branch offset, which is +// shifted left by 1 bit. +static DecodeStatus DecodeBranchTarget7MM(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder); + +// DecodeBranchTarget10MM - Decode microMIPS branch offset, which is +// shifted left by 1 bit. +static DecodeStatus DecodeBranchTarget10MM(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder); + +// DecodeBranchTargetMM - Decode microMIPS branch offset, which is +// shifted left by 1 bit. +static DecodeStatus DecodeBranchTargetMM(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder); + +// DecodeJumpTargetMM - Decode microMIPS jump target, which is +// shifted left by 1 bit. +static DecodeStatus DecodeJumpTargetMM(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + static DecodeStatus DecodeMem(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeCacheOp(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeCacheOpR6(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeCacheOpMM(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeSyncI(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMSA128Mem(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeMemMMImm4(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMemMMSPImm5Lsl2(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMemMMGPImm7Lsl2(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMemMMReglistImm4Lsl2(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMemMMImm12(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMemMMImm16(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + static DecodeStatus DecodeFMem(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeFMem2(MCInst &Inst, unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeFMem3(MCInst &Inst, unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeFMemCop2R6(MCInst &Inst, unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeSpecial3LlSc(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeAddiur2Simm7(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeUImm6Lsl2(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeLiSimm7(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeSimm4(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder); + static DecodeStatus DecodeSimm16(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder); -static DecodeStatus DecodeCondCode(MCInst &Inst, - unsigned Insn, - uint64_t Address, - const void *Decoder); +// Decode the immediate field of an LSA instruction which +// is off by one. +static DecodeStatus DecodeLSAImm(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); static DecodeStatus DecodeInsSize(MCInst &Inst, unsigned Insn, @@ -231,6 +382,72 @@ static DecodeStatus DecodeExtSize(MCInst &Inst, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSimm19Lsl2(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeSimm18Lsl3(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeSimm9SP(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeANDI16Imm(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeUImm5lsl2(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeSimm23Lsl2(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +/// INSVE_[BHWD] have an implicit operand that the generated decoder doesn't +/// handle. +template +static DecodeStatus DecodeINSVE_DF(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder); + +template +static DecodeStatus +DecodeAddiGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder); + +template +static DecodeStatus +DecodeDaddiGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder); + +template +static DecodeStatus +DecodeBlezlGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder); + +template +static DecodeStatus +DecodeBgtzlGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder); + +template +static DecodeStatus +DecodeBgtzGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder); + +template +static DecodeStatus +DecodeBlezGroupBranch(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeRegListOperand16(MCInst &Inst, unsigned Insn, + uint64_t Address, + const void *Decoder); + +static DecodeStatus DecodeMovePRegPair(MCInst &Inst, unsigned Insn, + uint64_t Address, + const void *Decoder); + namespace llvm { extern Target TheMipselTarget, TheMipsTarget, TheMips64Target, TheMips64elTarget; @@ -238,26 +455,30 @@ extern Target TheMipselTarget, TheMipsTarget, TheMips64Target, static MCDisassembler *createMipsDisassembler( const Target &T, - const MCSubtargetInfo &STI) { - return new MipsDisassembler(STI,true); + const MCSubtargetInfo &STI, + MCContext &Ctx) { + return new MipsDisassembler(STI, Ctx, true); } static MCDisassembler *createMipselDisassembler( const Target &T, - const MCSubtargetInfo &STI) { - return new MipsDisassembler(STI,false); + const MCSubtargetInfo &STI, + MCContext &Ctx) { + return new MipsDisassembler(STI, Ctx, false); } static MCDisassembler *createMips64Disassembler( const Target &T, - const MCSubtargetInfo &STI) { - return new Mips64Disassembler(STI,true); + const MCSubtargetInfo &STI, + MCContext &Ctx) { + return new Mips64Disassembler(STI, Ctx, true); } static MCDisassembler *createMips64elDisassembler( const Target &T, - const MCSubtargetInfo &STI) { - return new Mips64Disassembler(STI, false); + const MCSubtargetInfo &STI, + MCContext &Ctx) { + return new Mips64Disassembler(STI, Ctx, false); } extern "C" void LLVMInitializeMipsDisassembler() { @@ -272,58 +493,445 @@ extern "C" void LLVMInitializeMipsDisassembler() { createMips64elDisassembler); } - #include "MipsGenDisassemblerTables.inc" - /// readInstruction - read four bytes from the MemoryObject - /// and return 32 bit word sorted according to the given endianess -static DecodeStatus readInstruction32(const MemoryObject ®ion, - uint64_t address, - uint64_t &size, - uint32_t &insn, - bool isBigEndian) { - uint8_t Bytes[4]; +static unsigned getReg(const void *D, unsigned RC, unsigned RegNo) { + const MipsDisassemblerBase *Dis = static_cast(D); + const MCRegisterInfo *RegInfo = Dis->getContext().getRegisterInfo(); + return *(RegInfo->getRegClass(RC).begin() + RegNo); +} - // We want to read exactly 4 Bytes of data. - if (region.readBytes(address, 4, (uint8_t*)Bytes, NULL) == -1) { - size = 0; +template +static DecodeStatus DecodeINSVE_DF(MCInst &MI, InsnType insn, uint64_t Address, + const void *Decoder) { + typedef DecodeStatus (*DecodeFN)(MCInst &, unsigned, uint64_t, const void *); + // The size of the n field depends on the element size + // The register class also depends on this. + InsnType tmp = fieldFromInstruction(insn, 17, 5); + unsigned NSize = 0; + DecodeFN RegDecoder = nullptr; + if ((tmp & 0x18) == 0x00) { // INSVE_B + NSize = 4; + RegDecoder = DecodeMSA128BRegisterClass; + } else if ((tmp & 0x1c) == 0x10) { // INSVE_H + NSize = 3; + RegDecoder = DecodeMSA128HRegisterClass; + } else if ((tmp & 0x1e) == 0x18) { // INSVE_W + NSize = 2; + RegDecoder = DecodeMSA128WRegisterClass; + } else if ((tmp & 0x1f) == 0x1c) { // INSVE_D + NSize = 1; + RegDecoder = DecodeMSA128DRegisterClass; + } else + llvm_unreachable("Invalid encoding"); + + assert(NSize != 0 && RegDecoder != nullptr); + + // $wd + tmp = fieldFromInstruction(insn, 6, 5); + if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail) + return MCDisassembler::Fail; + // $wd_in + if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail) + return MCDisassembler::Fail; + // $n + tmp = fieldFromInstruction(insn, 16, NSize); + MI.addOperand(MCOperand::CreateImm(tmp)); + // $ws + tmp = fieldFromInstruction(insn, 11, 5); + if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler::Fail) + return MCDisassembler::Fail; + // $n2 + MI.addOperand(MCOperand::CreateImm(0)); + + return MCDisassembler::Success; +} + +template +static DecodeStatus DecodeAddiGroupBranch(MCInst &MI, InsnType insn, + uint64_t Address, + const void *Decoder) { + // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled + // (otherwise we would have matched the ADDI instruction from the earlier + // ISA's instead). + // + // We have: + // 0b001000 sssss ttttt iiiiiiiiiiiiiiii + // BOVC if rs >= rt + // BEQZALC if rs == 0 && rt != 0 + // BEQC if rs < rt && rs != 0 + + InsnType Rs = fieldFromInstruction(insn, 21, 5); + InsnType Rt = fieldFromInstruction(insn, 16, 5); + InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; + bool HasRs = false; + + if (Rs >= Rt) { + MI.setOpcode(Mips::BOVC); + HasRs = true; + } else if (Rs != 0 && Rs < Rt) { + MI.setOpcode(Mips::BEQC); + HasRs = true; + } else + MI.setOpcode(Mips::BEQZALC); + + if (HasRs) + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rs))); + + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rt))); + MI.addOperand(MCOperand::CreateImm(Imm)); + + return MCDisassembler::Success; +} + +template +static DecodeStatus DecodeDaddiGroupBranch(MCInst &MI, InsnType insn, + uint64_t Address, + const void *Decoder) { + // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled + // (otherwise we would have matched the ADDI instruction from the earlier + // ISA's instead). + // + // We have: + // 0b011000 sssss ttttt iiiiiiiiiiiiiiii + // BNVC if rs >= rt + // BNEZALC if rs == 0 && rt != 0 + // BNEC if rs < rt && rs != 0 + + InsnType Rs = fieldFromInstruction(insn, 21, 5); + InsnType Rt = fieldFromInstruction(insn, 16, 5); + InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; + bool HasRs = false; + + if (Rs >= Rt) { + MI.setOpcode(Mips::BNVC); + HasRs = true; + } else if (Rs != 0 && Rs < Rt) { + MI.setOpcode(Mips::BNEC); + HasRs = true; + } else + MI.setOpcode(Mips::BNEZALC); + + if (HasRs) + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rs))); + + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rt))); + MI.addOperand(MCOperand::CreateImm(Imm)); + + return MCDisassembler::Success; +} + +template +static DecodeStatus DecodeBlezlGroupBranch(MCInst &MI, InsnType insn, + uint64_t Address, + const void *Decoder) { + // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled + // (otherwise we would have matched the BLEZL instruction from the earlier + // ISA's instead). + // + // We have: + // 0b010110 sssss ttttt iiiiiiiiiiiiiiii + // Invalid if rs == 0 + // BLEZC if rs == 0 && rt != 0 + // BGEZC if rs == rt && rt != 0 + // BGEC if rs != rt && rs != 0 && rt != 0 + + InsnType Rs = fieldFromInstruction(insn, 21, 5); + InsnType Rt = fieldFromInstruction(insn, 16, 5); + InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; + bool HasRs = false; + + if (Rt == 0) return MCDisassembler::Fail; + else if (Rs == 0) + MI.setOpcode(Mips::BLEZC); + else if (Rs == Rt) + MI.setOpcode(Mips::BGEZC); + else { + HasRs = true; + MI.setOpcode(Mips::BGEC); } - if (isBigEndian) { - // Encoded as a big-endian 32-bit word in the stream. - insn = (Bytes[3] << 0) | - (Bytes[2] << 8) | - (Bytes[1] << 16) | - (Bytes[0] << 24); + if (HasRs) + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rs))); + + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rt))); + + MI.addOperand(MCOperand::CreateImm(Imm)); + + return MCDisassembler::Success; +} + +template +static DecodeStatus DecodeBgtzlGroupBranch(MCInst &MI, InsnType insn, + uint64_t Address, + const void *Decoder) { + // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled + // (otherwise we would have matched the BGTZL instruction from the earlier + // ISA's instead). + // + // We have: + // 0b010111 sssss ttttt iiiiiiiiiiiiiiii + // Invalid if rs == 0 + // BGTZC if rs == 0 && rt != 0 + // BLTZC if rs == rt && rt != 0 + // BLTC if rs != rt && rs != 0 && rt != 0 + + bool HasRs = false; + + InsnType Rs = fieldFromInstruction(insn, 21, 5); + InsnType Rt = fieldFromInstruction(insn, 16, 5); + InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; + + if (Rt == 0) + return MCDisassembler::Fail; + else if (Rs == 0) + MI.setOpcode(Mips::BGTZC); + else if (Rs == Rt) + MI.setOpcode(Mips::BLTZC); + else { + MI.setOpcode(Mips::BLTC); + HasRs = true; } + + if (HasRs) + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rs))); + + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rt))); + + MI.addOperand(MCOperand::CreateImm(Imm)); + + return MCDisassembler::Success; +} + +template +static DecodeStatus DecodeBgtzGroupBranch(MCInst &MI, InsnType insn, + uint64_t Address, + const void *Decoder) { + // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled + // (otherwise we would have matched the BGTZ instruction from the earlier + // ISA's instead). + // + // We have: + // 0b000111 sssss ttttt iiiiiiiiiiiiiiii + // BGTZ if rt == 0 + // BGTZALC if rs == 0 && rt != 0 + // BLTZALC if rs != 0 && rs == rt + // BLTUC if rs != 0 && rs != rt + + InsnType Rs = fieldFromInstruction(insn, 21, 5); + InsnType Rt = fieldFromInstruction(insn, 16, 5); + InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; + bool HasRs = false; + bool HasRt = false; + + if (Rt == 0) { + MI.setOpcode(Mips::BGTZ); + HasRs = true; + } else if (Rs == 0) { + MI.setOpcode(Mips::BGTZALC); + HasRt = true; + } else if (Rs == Rt) { + MI.setOpcode(Mips::BLTZALC); + HasRs = true; + } else { + MI.setOpcode(Mips::BLTUC); + HasRs = true; + HasRt = true; + } + + if (HasRs) + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rs))); + + if (HasRt) + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rt))); + + MI.addOperand(MCOperand::CreateImm(Imm)); + + return MCDisassembler::Success; +} + +template +static DecodeStatus DecodeBlezGroupBranch(MCInst &MI, InsnType insn, + uint64_t Address, + const void *Decoder) { + // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled + // (otherwise we would have matched the BLEZL instruction from the earlier + // ISA's instead). + // + // We have: + // 0b000110 sssss ttttt iiiiiiiiiiiiiiii + // Invalid if rs == 0 + // BLEZALC if rs == 0 && rt != 0 + // BGEZALC if rs == rt && rt != 0 + // BGEUC if rs != rt && rs != 0 && rt != 0 + + InsnType Rs = fieldFromInstruction(insn, 21, 5); + InsnType Rt = fieldFromInstruction(insn, 16, 5); + InsnType Imm = SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; + bool HasRs = false; + + if (Rt == 0) + return MCDisassembler::Fail; + else if (Rs == 0) + MI.setOpcode(Mips::BLEZALC); + else if (Rs == Rt) + MI.setOpcode(Mips::BGEZALC); else { - // Encoded as a small-endian 32-bit word in the stream. - insn = (Bytes[0] << 0) | - (Bytes[1] << 8) | - (Bytes[2] << 16) | - (Bytes[3] << 24); + HasRs = true; + MI.setOpcode(Mips::BGEUC); } + if (HasRs) + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rs))); + MI.addOperand(MCOperand::CreateReg(getReg(Decoder, Mips::GPR32RegClassID, + Rt))); + + MI.addOperand(MCOperand::CreateImm(Imm)); + return MCDisassembler::Success; } -DecodeStatus -MipsDisassembler::getInstruction(MCInst &instr, - uint64_t &Size, - const MemoryObject &Region, - uint64_t Address, - raw_ostream &vStream, - raw_ostream &cStream) const { +/// Read two bytes from the ArrayRef and return 16 bit halfword sorted +/// according to the given endianess. +static DecodeStatus readInstruction16(ArrayRef Bytes, uint64_t Address, + uint64_t &Size, uint32_t &Insn, + bool IsBigEndian) { + // We want to read exactly 2 Bytes of data. + if (Bytes.size() < 2) { + Size = 0; + return MCDisassembler::Fail; + } + + if (IsBigEndian) { + Insn = (Bytes[0] << 8) | Bytes[1]; + } else { + Insn = (Bytes[1] << 8) | Bytes[0]; + } + + return MCDisassembler::Success; +} + +/// Read four bytes from the ArrayRef and return 32 bit word sorted +/// according to the given endianess +static DecodeStatus readInstruction32(ArrayRef Bytes, uint64_t Address, + uint64_t &Size, uint32_t &Insn, + bool IsBigEndian, bool IsMicroMips) { + // We want to read exactly 4 Bytes of data. + if (Bytes.size() < 4) { + Size = 0; + return MCDisassembler::Fail; + } + + // High 16 bits of a 32-bit microMIPS instruction (where the opcode is) + // always precede the low 16 bits in the instruction stream (that is, they + // are placed at lower addresses in the instruction stream). + // + // microMIPS byte ordering: + // Big-endian: 0 | 1 | 2 | 3 + // Little-endian: 1 | 0 | 3 | 2 + + if (IsBigEndian) { + // Encoded as a big-endian 32-bit word in the stream. + Insn = + (Bytes[3] << 0) | (Bytes[2] << 8) | (Bytes[1] << 16) | (Bytes[0] << 24); + } else { + if (IsMicroMips) { + Insn = (Bytes[2] << 0) | (Bytes[3] << 8) | (Bytes[0] << 16) | + (Bytes[1] << 24); + } else { + Insn = (Bytes[0] << 0) | (Bytes[1] << 8) | (Bytes[2] << 16) | + (Bytes[3] << 24); + } + } + + return MCDisassembler::Success; +} + +DecodeStatus MipsDisassembler::getInstruction(MCInst &Instr, uint64_t &Size, + ArrayRef Bytes, + uint64_t Address, + raw_ostream &VStream, + raw_ostream &CStream) const { uint32_t Insn; + DecodeStatus Result; + + if (IsMicroMips) { + Result = readInstruction16(Bytes, Address, Size, Insn, IsBigEndian); + + DEBUG(dbgs() << "Trying MicroMips16 table (16-bit instructions):\n"); + // Calling the auto-generated decoder function. + Result = decodeInstruction(DecoderTableMicroMips16, Instr, Insn, Address, + this, STI); + if (Result != MCDisassembler::Fail) { + Size = 2; + return Result; + } + + Result = readInstruction32(Bytes, Address, Size, Insn, IsBigEndian, true); + if (Result == MCDisassembler::Fail) + return MCDisassembler::Fail; + + DEBUG(dbgs() << "Trying MicroMips32 table (32-bit instructions):\n"); + // Calling the auto-generated decoder function. + Result = decodeInstruction(DecoderTableMicroMips32, Instr, Insn, Address, + this, STI); + if (Result != MCDisassembler::Fail) { + Size = 4; + return Result; + } + return MCDisassembler::Fail; + } - DecodeStatus Result = readInstruction32(Region, Address, Size, - Insn, isBigEndian); + Result = readInstruction32(Bytes, Address, Size, Insn, IsBigEndian, false); if (Result == MCDisassembler::Fail) return MCDisassembler::Fail; + if (hasCOP3()) { + DEBUG(dbgs() << "Trying COP3_ table (32-bit opcodes):\n"); + Result = + decodeInstruction(DecoderTableCOP3_32, Instr, Insn, Address, this, STI); + if (Result != MCDisassembler::Fail) { + Size = 4; + return Result; + } + } + + if (hasMips32r6() && isGP64()) { + DEBUG(dbgs() << "Trying Mips32r6_64r6 (GPR64) table (32-bit opcodes):\n"); + Result = decodeInstruction(DecoderTableMips32r6_64r6_GP6432, Instr, Insn, + Address, this, STI); + if (Result != MCDisassembler::Fail) { + Size = 4; + return Result; + } + } + + if (hasMips32r6()) { + DEBUG(dbgs() << "Trying Mips32r6_64r6 table (32-bit opcodes):\n"); + Result = decodeInstruction(DecoderTableMips32r6_64r632, Instr, Insn, + Address, this, STI); + if (Result != MCDisassembler::Fail) { + Size = 4; + return Result; + } + } + + DEBUG(dbgs() << "Trying Mips table (32-bit opcodes):\n"); // Calling the auto-generated decoder function. - Result = decodeMipsInstruction32(instr, Insn, Address, this, STI); + Result = + decodeInstruction(DecoderTableMips32, Instr, Insn, Address, this, STI); if (Result != MCDisassembler::Fail) { Size = 4; return Result; @@ -332,28 +940,28 @@ MipsDisassembler::getInstruction(MCInst &instr, return MCDisassembler::Fail; } -DecodeStatus -Mips64Disassembler::getInstruction(MCInst &instr, - uint64_t &Size, - const MemoryObject &Region, - uint64_t Address, - raw_ostream &vStream, - raw_ostream &cStream) const { +DecodeStatus Mips64Disassembler::getInstruction(MCInst &Instr, uint64_t &Size, + ArrayRef Bytes, + uint64_t Address, + raw_ostream &VStream, + raw_ostream &CStream) const { uint32_t Insn; - DecodeStatus Result = readInstruction32(Region, Address, Size, - Insn, isBigEndian); + DecodeStatus Result = + readInstruction32(Bytes, Address, Size, Insn, IsBigEndian, false); if (Result == MCDisassembler::Fail) return MCDisassembler::Fail; // Calling the auto-generated decoder function. - Result = decodeMips64Instruction32(instr, Insn, Address, this, STI); + Result = + decodeInstruction(DecoderTableMips6432, Instr, Insn, Address, this, STI); if (Result != MCDisassembler::Fail) { Size = 4; return Result; } // If we fail to decode in Mips64 decoder space we can try in Mips32 - Result = decodeMipsInstruction32(instr, Insn, Address, this, STI); + Result = + decodeInstruction(DecoderTableMips32, Instr, Insn, Address, this, STI); if (Result != MCDisassembler::Fail) { Size = 4; return Result; @@ -362,73 +970,429 @@ Mips64Disassembler::getInstruction(MCInst &instr, return MCDisassembler::Fail; } -static DecodeStatus DecodeCPU64RegsRegisterClass(MCInst &Inst, +static DecodeStatus DecodeCPU16RegsRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { + return MCDisassembler::Fail; + +} + +static DecodeStatus DecodeGPR64RegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) return MCDisassembler::Fail; - Inst.addOperand(MCOperand::CreateReg(CPU64RegsTable[RegNo])); + unsigned Reg = getReg(Decoder, Mips::GPR64RegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); return MCDisassembler::Success; } -static DecodeStatus DecodeCPURegsRegisterClass(MCInst &Inst, +static DecodeStatus DecodeGPRMM16RegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { - if (RegNo > 31) + if (RegNo > 7) return MCDisassembler::Fail; - - Inst.addOperand(MCOperand::CreateReg(CPURegsTable[RegNo])); + unsigned Reg = getReg(Decoder, Mips::GPRMM16RegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); return MCDisassembler::Success; } -static DecodeStatus DecodeFGR64RegisterClass(MCInst &Inst, - unsigned RegNo, - uint64_t Address, - const void *Decoder) { - if (RegNo > 31) +static DecodeStatus DecodeGPRMM16ZeroRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 7) return MCDisassembler::Fail; + unsigned Reg = getReg(Decoder, Mips::GPRMM16ZeroRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} - Inst.addOperand(MCOperand::CreateReg(FGR64RegsTable[RegNo])); +static DecodeStatus DecodeGPRMM16MovePRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 7) + return MCDisassembler::Fail; + unsigned Reg = getReg(Decoder, Mips::GPRMM16MovePRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); return MCDisassembler::Success; } -static DecodeStatus DecodeFGR32RegisterClass(MCInst &Inst, +static DecodeStatus DecodeGPR32RegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { if (RegNo > 31) return MCDisassembler::Fail; - - Inst.addOperand(MCOperand::CreateReg(FGR32RegsTable[RegNo])); + unsigned Reg = getReg(Decoder, Mips::GPR32RegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); return MCDisassembler::Success; } -static DecodeStatus DecodeCCRRegisterClass(MCInst &Inst, +static DecodeStatus DecodePtrRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { - Inst.addOperand(MCOperand::CreateReg(RegNo)); - return MCDisassembler::Success; + if (static_cast(Decoder)->isGP64Bit()) + return DecodeGPR64RegisterClass(Inst, RegNo, Address, Decoder); + + return DecodeGPR32RegisterClass(Inst, RegNo, Address, Decoder); } -static DecodeStatus DecodeMem(MCInst &Inst, - unsigned Insn, - uint64_t Address, - const void *Decoder) { - int Offset = SignExtend32<16>(Insn & 0xffff); - int Reg = (int)fieldFromInstruction32(Insn, 16, 5); - int Base = (int)fieldFromInstruction32(Insn, 21, 5); +static DecodeStatus DecodeDSPRRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + return DecodeGPR32RegisterClass(Inst, RegNo, Address, Decoder); +} - if(Inst.getOpcode() == Mips::SC){ - Inst.addOperand(MCOperand::CreateReg(CPURegsTable[Reg])); - } +static DecodeStatus DecodeFGR64RegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::FGR64RegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeFGR32RegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::FGR32RegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCCRRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + unsigned Reg = getReg(Decoder, Mips::CCRRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeFCCRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 7) + return MCDisassembler::Fail; + unsigned Reg = getReg(Decoder, Mips::FCCRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeFGRCCRegisterClass(MCInst &Inst, unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::FGRCCRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMem(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<16>(Insn & 0xffff); + unsigned Reg = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + if(Inst.getOpcode() == Mips::SC || + Inst.getOpcode() == Mips::SCD){ + Inst.addOperand(MCOperand::CreateReg(Reg)); + } - Inst.addOperand(MCOperand::CreateReg(CPURegsTable[Reg])); - Inst.addOperand(MCOperand::CreateReg(CPURegsTable[Base])); + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCacheOp(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<16>(Insn & 0xffff); + unsigned Hint = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + Inst.addOperand(MCOperand::CreateImm(Hint)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCacheOpMM(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<12>(Insn & 0xfff); + unsigned Base = fieldFromInstruction(Insn, 16, 5); + unsigned Hint = fieldFromInstruction(Insn, 21, 5); + + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + Inst.addOperand(MCOperand::CreateImm(Hint)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCacheOpR6(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = fieldFromInstruction(Insn, 7, 9); + unsigned Hint = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + Inst.addOperand(MCOperand::CreateImm(Hint)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeSyncI(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<16>(Insn & 0xffff); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMSA128Mem(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + int Offset = SignExtend32<10>(fieldFromInstruction(Insn, 16, 10)); + unsigned Reg = fieldFromInstruction(Insn, 6, 5); + unsigned Base = fieldFromInstruction(Insn, 11, 5); + + Reg = getReg(Decoder, Mips::MSA128BRegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Base)); + + // The immediate field of an LD/ST instruction is scaled which means it must + // be multiplied (when decoding) by the size (in bytes) of the instructions' + // data format. + // .b - 1 byte + // .h - 2 bytes + // .w - 4 bytes + // .d - 8 bytes + switch(Inst.getOpcode()) + { + default: + assert (0 && "Unexpected instruction"); + return MCDisassembler::Fail; + break; + case Mips::LD_B: + case Mips::ST_B: + Inst.addOperand(MCOperand::CreateImm(Offset)); + break; + case Mips::LD_H: + case Mips::ST_H: + Inst.addOperand(MCOperand::CreateImm(Offset * 2)); + break; + case Mips::LD_W: + case Mips::ST_W: + Inst.addOperand(MCOperand::CreateImm(Offset * 4)); + break; + case Mips::LD_D: + case Mips::ST_D: + Inst.addOperand(MCOperand::CreateImm(Offset * 8)); + break; + } + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMemMMImm4(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + unsigned Offset = Insn & 0xf; + unsigned Reg = fieldFromInstruction(Insn, 7, 3); + unsigned Base = fieldFromInstruction(Insn, 4, 3); + + switch (Inst.getOpcode()) { + case Mips::LBU16_MM: + case Mips::LHU16_MM: + case Mips::LW16_MM: + if (DecodeGPRMM16RegisterClass(Inst, Reg, Address, Decoder) + == MCDisassembler::Fail) + return MCDisassembler::Fail; + break; + case Mips::SB16_MM: + case Mips::SH16_MM: + case Mips::SW16_MM: + if (DecodeGPRMM16ZeroRegisterClass(Inst, Reg, Address, Decoder) + == MCDisassembler::Fail) + return MCDisassembler::Fail; + break; + } + + if (DecodeGPRMM16RegisterClass(Inst, Base, Address, Decoder) + == MCDisassembler::Fail) + return MCDisassembler::Fail; + + switch (Inst.getOpcode()) { + case Mips::LBU16_MM: + if (Offset == 0xf) + Inst.addOperand(MCOperand::CreateImm(-1)); + else + Inst.addOperand(MCOperand::CreateImm(Offset)); + break; + case Mips::SB16_MM: + Inst.addOperand(MCOperand::CreateImm(Offset)); + break; + case Mips::LHU16_MM: + case Mips::SH16_MM: + Inst.addOperand(MCOperand::CreateImm(Offset << 1)); + break; + case Mips::LW16_MM: + case Mips::SW16_MM: + Inst.addOperand(MCOperand::CreateImm(Offset << 2)); + break; + } + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMemMMSPImm5Lsl2(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + unsigned Offset = Insn & 0x1F; + unsigned Reg = fieldFromInstruction(Insn, 5, 5); + + Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Mips::SP)); + Inst.addOperand(MCOperand::CreateImm(Offset << 2)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMemMMGPImm7Lsl2(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + unsigned Offset = Insn & 0x7F; + unsigned Reg = fieldFromInstruction(Insn, 7, 3); + + Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Mips::GP)); + Inst.addOperand(MCOperand::CreateImm(Offset << 2)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMemMMReglistImm4Lsl2(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<4>(Insn & 0xf); + + if (DecodeRegListOperand16(Inst, Insn, Address, Decoder) + == MCDisassembler::Fail) + return MCDisassembler::Fail; + + Inst.addOperand(MCOperand::CreateReg(Mips::SP)); + Inst.addOperand(MCOperand::CreateImm(Offset << 2)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMemMMImm12(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<12>(Insn & 0x0fff); + unsigned Reg = fieldFromInstruction(Insn, 21, 5); + unsigned Base = fieldFromInstruction(Insn, 16, 5); + + Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + switch (Inst.getOpcode()) { + case Mips::SWM32_MM: + case Mips::LWM32_MM: + if (DecodeRegListOperand(Inst, Insn, Address, Decoder) + == MCDisassembler::Fail) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + break; + case Mips::SC_MM: + Inst.addOperand(MCOperand::CreateReg(Reg)); + // fallthrough + default: + Inst.addOperand(MCOperand::CreateReg(Reg)); + if (Inst.getOpcode() == Mips::LWP_MM || Inst.getOpcode() == Mips::SWP_MM) + Inst.addOperand(MCOperand::CreateReg(Reg+1)); + + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + } + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMemMMImm16(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<16>(Insn & 0xffff); + unsigned Reg = fieldFromInstruction(Insn, 21, 5); + unsigned Base = fieldFromInstruction(Insn, 16, 5); + + Reg = getReg(Decoder, Mips::GPR32RegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Base)); Inst.addOperand(MCOperand::CreateImm(Offset)); return MCDisassembler::Success; @@ -439,16 +1403,93 @@ static DecodeStatus DecodeFMem(MCInst &Inst, uint64_t Address, const void *Decoder) { int Offset = SignExtend32<16>(Insn & 0xffff); - int Reg = (int)fieldFromInstruction32(Insn, 16, 5); - int Base = (int)fieldFromInstruction32(Insn, 21, 5); + unsigned Reg = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Reg = getReg(Decoder, Mips::FGR64RegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeFMem2(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<16>(Insn & 0xffff); + unsigned Reg = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Reg = getReg(Decoder, Mips::COP2RegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeFMem3(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<16>(Insn & 0xffff); + unsigned Reg = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Reg = getReg(Decoder, Mips::COP3RegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); - Inst.addOperand(MCOperand::CreateReg(FGR64RegsTable[Reg])); - Inst.addOperand(MCOperand::CreateReg(CPURegsTable[Base])); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeFMemCop2R6(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int Offset = SignExtend32<11>(Insn & 0x07ff); + unsigned Reg = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 11, 5); + + Reg = getReg(Decoder, Mips::COP2RegClassID, Reg); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + Inst.addOperand(MCOperand::CreateReg(Reg)); + Inst.addOperand(MCOperand::CreateReg(Base)); Inst.addOperand(MCOperand::CreateImm(Offset)); return MCDisassembler::Success; } +static DecodeStatus DecodeSpecial3LlSc(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + int64_t Offset = SignExtend64<9>((Insn >> 7) & 0x1ff); + unsigned Rt = fieldFromInstruction(Insn, 16, 5); + unsigned Base = fieldFromInstruction(Insn, 21, 5); + + Rt = getReg(Decoder, Mips::GPR32RegClassID, Rt); + Base = getReg(Decoder, Mips::GPR32RegClassID, Base); + + if(Inst.getOpcode() == Mips::SC_R6 || Inst.getOpcode() == Mips::SCD_R6){ + Inst.addOperand(MCOperand::CreateReg(Rt)); + } + + Inst.addOperand(MCOperand::CreateReg(Rt)); + Inst.addOperand(MCOperand::CreateReg(Base)); + Inst.addOperand(MCOperand::CreateImm(Offset)); + return MCDisassembler::Success; +} static DecodeStatus DecodeHWRegsRegisterClass(MCInst &Inst, unsigned RegNo, @@ -461,34 +1502,124 @@ static DecodeStatus DecodeHWRegsRegisterClass(MCInst &Inst, return MCDisassembler::Success; } -static DecodeStatus DecodeCondCode(MCInst &Inst, - unsigned Insn, - uint64_t Address, - const void *Decoder) { - int CondCode = Insn & 0xf; - Inst.addOperand(MCOperand::CreateImm(CondCode)); - return MCDisassembler::Success; -} - static DecodeStatus DecodeAFGR64RegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { - if (RegNo > 31) + if (RegNo > 30 || RegNo %2) return MCDisassembler::Fail; - Inst.addOperand(MCOperand::CreateReg(AFGR64RegsTable[RegNo])); + ; + unsigned Reg = getReg(Decoder, Mips::AFGR64RegClassID, RegNo /2); + Inst.addOperand(MCOperand::CreateReg(Reg)); return MCDisassembler::Success; } -static DecodeStatus DecodeHWRegs64RegisterClass(MCInst &Inst, +static DecodeStatus DecodeACC64DSPRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { - //Currently only hardware register 29 is supported - if (RegNo != 29) - return MCDisassembler::Fail; - Inst.addOperand(MCOperand::CreateReg(Mips::HWR29)); + if (RegNo >= 4) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::ACC64DSPRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeHI32DSPRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo >= 4) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::HI32DSPRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeLO32DSPRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo >= 4) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::LO32DSPRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMSA128BRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::MSA128BRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMSA128HRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::MSA128HRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMSA128WRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::MSA128WRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMSA128DRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::MSA128DRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMSACtrlRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 7) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::MSACtrlRegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCOP2RegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = getReg(Decoder, Mips::COP2RegClassID, RegNo); + Inst.addOperand(MCOperand::CreateReg(Reg)); return MCDisassembler::Success; } @@ -496,18 +1627,7 @@ static DecodeStatus DecodeBranchTarget(MCInst &Inst, unsigned Offset, uint64_t Address, const void *Decoder) { - unsigned BranchOffset = Offset & 0xffff; - BranchOffset = SignExtend32<18>(BranchOffset << 2) + 4; - Inst.addOperand(MCOperand::CreateImm(BranchOffset)); - return MCDisassembler::Success; -} - -static DecodeStatus DecodeBC1(MCInst &Inst, - unsigned Insn, - uint64_t Address, - const void *Decoder) { - unsigned BranchOffset = Insn & 0xffff; - BranchOffset = SignExtend32<18>(BranchOffset << 2) + 4; + int32_t BranchOffset = (SignExtend32<16>(Offset) * 4) + 4; Inst.addOperand(MCOperand::CreateImm(BranchOffset)); return MCDisassembler::Success; } @@ -517,11 +1637,106 @@ static DecodeStatus DecodeJumpTarget(MCInst &Inst, uint64_t Address, const void *Decoder) { - unsigned JumpOffset = fieldFromInstruction32(Insn, 0, 26) << 2; + unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 2; Inst.addOperand(MCOperand::CreateImm(JumpOffset)); return MCDisassembler::Success; } +static DecodeStatus DecodeBranchTarget21(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder) { + int32_t BranchOffset = SignExtend32<21>(Offset) * 4; + + Inst.addOperand(MCOperand::CreateImm(BranchOffset)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeBranchTarget26(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder) { + int32_t BranchOffset = SignExtend32<26>(Offset) * 4; + + Inst.addOperand(MCOperand::CreateImm(BranchOffset)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeBranchTarget7MM(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder) { + int32_t BranchOffset = SignExtend32<7>(Offset) << 1; + Inst.addOperand(MCOperand::CreateImm(BranchOffset)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeBranchTarget10MM(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder) { + int32_t BranchOffset = SignExtend32<10>(Offset) << 1; + Inst.addOperand(MCOperand::CreateImm(BranchOffset)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeBranchTargetMM(MCInst &Inst, + unsigned Offset, + uint64_t Address, + const void *Decoder) { + int32_t BranchOffset = SignExtend32<16>(Offset) * 2; + Inst.addOperand(MCOperand::CreateImm(BranchOffset)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeJumpTargetMM(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 1; + Inst.addOperand(MCOperand::CreateImm(JumpOffset)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeAddiur2Simm7(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder) { + if (Value == 0) + Inst.addOperand(MCOperand::CreateImm(1)); + else if (Value == 0x7) + Inst.addOperand(MCOperand::CreateImm(-1)); + else + Inst.addOperand(MCOperand::CreateImm(Value << 2)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeUImm6Lsl2(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(Value << 2)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeLiSimm7(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder) { + if (Value == 0x7F) + Inst.addOperand(MCOperand::CreateImm(-1)); + else + Inst.addOperand(MCOperand::CreateImm(Value)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeSimm4(MCInst &Inst, + unsigned Value, + uint64_t Address, + const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(SignExtend32<4>(Value))); + return MCDisassembler::Success; +} static DecodeStatus DecodeSimm16(MCInst &Inst, unsigned Insn, @@ -531,6 +1746,15 @@ static DecodeStatus DecodeSimm16(MCInst &Inst, return MCDisassembler::Success; } +static DecodeStatus DecodeLSAImm(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + // We add one to the immediate field as it was encoded as 'imm - 1'. + Inst.addOperand(MCOperand::CreateImm(Insn + 1)); + return MCDisassembler::Success; +} + static DecodeStatus DecodeInsSize(MCInst &Inst, unsigned Insn, uint64_t Address, @@ -550,3 +1774,134 @@ static DecodeStatus DecodeExtSize(MCInst &Inst, Inst.addOperand(MCOperand::CreateImm(SignExtend32<16>(Size))); return MCDisassembler::Success; } + +static DecodeStatus DecodeSimm19Lsl2(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(SignExtend32<19>(Insn) * 4)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeSimm18Lsl3(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(SignExtend32<18>(Insn) * 8)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeSimm9SP(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + int32_t DecodedValue; + switch (Insn) { + case 0: DecodedValue = 256; break; + case 1: DecodedValue = 257; break; + case 510: DecodedValue = -258; break; + case 511: DecodedValue = -257; break; + default: DecodedValue = SignExtend32<9>(Insn); break; + } + Inst.addOperand(MCOperand::CreateImm(DecodedValue * 4)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeANDI16Imm(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + // Insn must be >= 0, since it is unsigned that condition is always true. + assert(Insn < 16); + int32_t DecodedValues[] = {128, 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, + 255, 32768, 65535}; + Inst.addOperand(MCOperand::CreateImm(DecodedValues[Insn])); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeUImm5lsl2(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(Insn << 2)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeRegListOperand(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + unsigned Regs[] = {Mips::S0, Mips::S1, Mips::S2, Mips::S3, Mips::S4, Mips::S5, + Mips::S6, Mips::FP}; + unsigned RegNum; + + unsigned RegLst = fieldFromInstruction(Insn, 21, 5); + // Empty register lists are not allowed. + if (RegLst == 0) + return MCDisassembler::Fail; + + RegNum = RegLst & 0xf; + for (unsigned i = 0; i < RegNum; i++) + Inst.addOperand(MCOperand::CreateReg(Regs[i])); + + if (RegLst & 0x10) + Inst.addOperand(MCOperand::CreateReg(Mips::RA)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeRegListOperand16(MCInst &Inst, unsigned Insn, + uint64_t Address, + const void *Decoder) { + unsigned Regs[] = {Mips::S0, Mips::S1, Mips::S2, Mips::S3}; + unsigned RegLst = fieldFromInstruction(Insn, 4, 2); + unsigned RegNum = RegLst & 0x3; + + for (unsigned i = 0; i <= RegNum; i++) + Inst.addOperand(MCOperand::CreateReg(Regs[i])); + + Inst.addOperand(MCOperand::CreateReg(Mips::RA)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMovePRegPair(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + + unsigned RegPair = fieldFromInstruction(Insn, 7, 3); + + switch (RegPair) { + default: + return MCDisassembler::Fail; + case 0: + Inst.addOperand(MCOperand::CreateReg(Mips::A1)); + Inst.addOperand(MCOperand::CreateReg(Mips::A2)); + break; + case 1: + Inst.addOperand(MCOperand::CreateReg(Mips::A1)); + Inst.addOperand(MCOperand::CreateReg(Mips::A3)); + break; + case 2: + Inst.addOperand(MCOperand::CreateReg(Mips::A2)); + Inst.addOperand(MCOperand::CreateReg(Mips::A3)); + break; + case 3: + Inst.addOperand(MCOperand::CreateReg(Mips::A0)); + Inst.addOperand(MCOperand::CreateReg(Mips::S5)); + break; + case 4: + Inst.addOperand(MCOperand::CreateReg(Mips::A0)); + Inst.addOperand(MCOperand::CreateReg(Mips::S6)); + break; + case 5: + Inst.addOperand(MCOperand::CreateReg(Mips::A0)); + Inst.addOperand(MCOperand::CreateReg(Mips::A1)); + break; + case 6: + Inst.addOperand(MCOperand::CreateReg(Mips::A0)); + Inst.addOperand(MCOperand::CreateReg(Mips::A2)); + break; + case 7: + Inst.addOperand(MCOperand::CreateReg(Mips::A0)); + Inst.addOperand(MCOperand::CreateReg(Mips::A3)); + break; + } + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeSimm23Lsl2(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(SignExtend32<23>(Insn) << 2)); + return MCDisassembler::Success; +}