diff options
Diffstat (limited to 'contrib/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp | 4455 |
1 files changed, 3974 insertions, 481 deletions
diff --git a/contrib/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/contrib/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp index bdce2c4cf896..8f2f813b676a 100644 --- a/contrib/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp +++ b/contrib/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp @@ -6,584 +6,4077 @@ // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// -// -// This file is part of the ARM Disassembler. -// It contains code to implement the public interfaces of ARMDisassembler and -// ThumbDisassembler, both of which are instances of MCDisassembler. -// -//===----------------------------------------------------------------------===// #define DEBUG_TYPE "arm-disassembler" -#include "ARMDisassembler.h" -#include "ARMDisassemblerCore.h" - -#include "llvm/ADT/OwningPtr.h" +#include "ARM.h" +#include "ARMRegisterInfo.h" +#include "ARMSubtarget.h" +#include "MCTargetDesc/ARMAddressingModes.h" +#include "MCTargetDesc/ARMMCExpr.h" +#include "MCTargetDesc/ARMBaseInfo.h" #include "llvm/MC/EDInstInfo.h" #include "llvm/MC/MCInst.h" -#include "llvm/Target/TargetRegistry.h" +#include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCContext.h" +#include "llvm/MC/MCDisassembler.h" #include "llvm/Support/Debug.h" #include "llvm/Support/MemoryObject.h" #include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/TargetRegistry.h" #include "llvm/Support/raw_ostream.h" -//#define DEBUG(X) do { X; } while (0) - -/// ARMGenDecoderTables.inc - ARMDecoderTables.inc is tblgen'ed from -/// ARMDecoderEmitter.cpp TableGen backend. It contains: -/// -/// o Mappings from opcode to ARM/Thumb instruction format -/// -/// o static uint16_t decodeInstruction(uint32_t insn) - the decoding function -/// for an ARM instruction. -/// -/// o static uint16_t decodeThumbInstruction(field_t insn) - the decoding -/// function for a Thumb instruction. -/// -#include "ARMGenDecoderTables.inc" +using namespace llvm; + +typedef MCDisassembler::DecodeStatus DecodeStatus; +namespace { +/// ARMDisassembler - ARM disassembler for all ARM platforms. +class ARMDisassembler : public MCDisassembler { +public: + /// Constructor - Initializes the disassembler. + /// + ARMDisassembler(const MCSubtargetInfo &STI) : + MCDisassembler(STI) { + } + + ~ARMDisassembler() { + } + + /// 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. + EDInstInfo *getEDInfo() const; +private: +}; + +/// ThumbDisassembler - Thumb disassembler for all Thumb platforms. +class ThumbDisassembler : public MCDisassembler { +public: + /// Constructor - Initializes the disassembler. + /// + ThumbDisassembler(const MCSubtargetInfo &STI) : + MCDisassembler(STI) { + } + + ~ThumbDisassembler() { + } + + /// 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. + EDInstInfo *getEDInfo() const; +private: + mutable std::vector<unsigned> ITBlock; + DecodeStatus AddThumbPredicate(MCInst&) const; + void UpdateThumbVFPPredicate(MCInst&) const; +}; +} + +static bool Check(DecodeStatus &Out, DecodeStatus In) { + switch (In) { + case MCDisassembler::Success: + // Out stays the same. + return true; + case MCDisassembler::SoftFail: + Out = In; + return true; + case MCDisassembler::Fail: + Out = In; + return false; + } + return false; +} + + +// Forward declare these because the autogenerated code will reference them. +// Definitions are further down. +static DecodeStatus DecodeGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeGPRnopcRegisterClass(llvm::MCInst &Inst, + unsigned RegNo, uint64_t Address, + const void *Decoder); +static DecodeStatus DecodetGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodetcGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); +static DecodeStatus DecoderGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeDPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeDPR_8RegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeDPR_VFP2RegisterClass(llvm::MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder); +static DecodeStatus DecodeQPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodePredicateOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeCCOutOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSOImmOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeRegListOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSPRRegListOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeDPRRegListOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeBitfieldMaskOperand(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeCopMemInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeAddrMode2IdxInstruction(llvm::MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); +static DecodeStatus DecodeSORegMemOperand(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeAddrMode3Instruction(llvm::MCInst &Inst,unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSORegImmOperand(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSORegRegOperand(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeMemMultipleWritebackInstruction(llvm::MCInst & Inst, + unsigned Insn, + uint64_t Adddress, + const void *Decoder); +static DecodeStatus DecodeT2MOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeArmMOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSMLAInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeCPSInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2CPSInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeAddrModeImm12Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeAddrMode5Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeAddrMode7Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeBranchImmInstruction(llvm::MCInst &Inst,unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVCVTImmOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeAddrMode6Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLDInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVSTInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD1DupInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD2DupInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD3DupInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD4DupInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeNEONModImmInstruction(llvm::MCInst &Inst,unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVSHLMaxInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeShiftRight8Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeShiftRight16Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeShiftRight32Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeShiftRight64Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeTBLInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodePostIdxReg(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeCoprocessor(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeMemBarrierOption(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeMSRMask(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeDoubleRegLoad(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeDoubleRegStore(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeLDRPreImm(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeLDRPreReg(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSTRPreImm(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeSTRPreReg(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD1LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD2LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD3LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVLD4LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVST1LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVST2LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVST3LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVST4LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVMOVSRR(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeVMOVRRS(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); + +static DecodeStatus DecodeThumbAddSpecialReg(llvm::MCInst &Inst, uint16_t Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbBROperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2BROperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbCmpBROperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbAddrModeRR(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbAddrModeIS(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbAddrModePC(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbAddrModeSP(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2AddrModeSOReg(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2LoadShift(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2Imm8S4(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2AddrModeImm8s4(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2AddrModeImm0_1020s4(llvm::MCInst &Inst,unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2Imm8(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2AddrModeImm8(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbAddSPImm(llvm::MCInst &Inst, uint16_t Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbAddSPReg(llvm::MCInst &Inst, uint16_t Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbCPS(llvm::MCInst &Inst, uint16_t Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbBLXOffset(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2AddrModeImm12(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbTableBranch(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumb2BCCInstruction(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2SOImm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbBCCTargetOperand(llvm::MCInst &Inst,unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeThumbBLTargetOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2LDRDPreInstruction(llvm::MCInst &Inst,unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2STRDPreInstruction(llvm::MCInst &Inst,unsigned Insn, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2Adr(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2LdStPre(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); +static DecodeStatus DecodeT2ShifterImmOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder); + + + +#include "ARMGenDisassemblerTables.inc" +#include "ARMGenInstrInfo.inc" #include "ARMGenEDInfo.inc" -using namespace llvm; +static MCDisassembler *createARMDisassembler(const Target &T, const MCSubtargetInfo &STI) { + return new ARMDisassembler(STI); +} + +static MCDisassembler *createThumbDisassembler(const Target &T, const MCSubtargetInfo &STI) { + return new ThumbDisassembler(STI); +} -/// showBitVector - Use the raw_ostream to log a diagnostic message describing -/// the inidividual bits of the instruction. -/// -static inline void showBitVector(raw_ostream &os, const uint32_t &insn) { - // Split the bit position markers into more than one lines to fit 80 columns. - os << " 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11" - << " 10 9 8 7 6 5 4 3 2 1 0 \n"; - os << "---------------------------------------------------------------" - << "----------------------------------\n"; - os << '|'; - for (unsigned i = 32; i != 0; --i) { - if (insn >> (i - 1) & 0x01) - os << " 1"; +EDInstInfo *ARMDisassembler::getEDInfo() const { + return instInfoARM; +} + +EDInstInfo *ThumbDisassembler::getEDInfo() const { + return instInfoARM; +} + +DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size, + const MemoryObject &Region, + uint64_t Address, + raw_ostream &os, + raw_ostream &cs) const { + CommentStream = &cs; + + uint8_t bytes[4]; + + assert(!(STI.getFeatureBits() & ARM::ModeThumb) && + "Asked to disassemble an ARM instruction but Subtarget is in Thumb mode!"); + + // We want to read exactly 4 bytes of data. + if (Region.readBytes(Address, 4, (uint8_t*)bytes, NULL) == -1) { + Size = 0; + return MCDisassembler::Fail; + } + + // Encoded as a small-endian 32-bit word in the stream. + uint32_t insn = (bytes[3] << 24) | + (bytes[2] << 16) | + (bytes[1] << 8) | + (bytes[0] << 0); + + // Calling the auto-generated decoder function. + DecodeStatus result = decodeARMInstruction32(MI, insn, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + return result; + } + + // VFP and NEON instructions, similarly, are shared between ARM + // and Thumb modes. + MI.clear(); + result = decodeVFPInstruction32(MI, insn, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + return result; + } + + MI.clear(); + result = decodeNEONDataInstruction32(MI, insn, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + // Add a fake predicate operand, because we share these instruction + // definitions with Thumb2 where these instructions are predicable. + if (!DecodePredicateOperand(MI, 0xE, Address, this)) + return MCDisassembler::Fail; + return result; + } + + MI.clear(); + result = decodeNEONLoadStoreInstruction32(MI, insn, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + // Add a fake predicate operand, because we share these instruction + // definitions with Thumb2 where these instructions are predicable. + if (!DecodePredicateOperand(MI, 0xE, Address, this)) + return MCDisassembler::Fail; + return result; + } + + MI.clear(); + result = decodeNEONDupInstruction32(MI, insn, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + // Add a fake predicate operand, because we share these instruction + // definitions with Thumb2 where these instructions are predicable. + if (!DecodePredicateOperand(MI, 0xE, Address, this)) + return MCDisassembler::Fail; + return result; + } + + MI.clear(); + + Size = 0; + return MCDisassembler::Fail; +} + +namespace llvm { +extern MCInstrDesc ARMInsts[]; +} + +/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the +/// immediate Value in the MCInst. The immediate Value has had any PC +/// adjustment made by the caller. If the instruction is a branch instruction +/// then isBranch is true, else false. If the getOpInfo() function was set as +/// part of the setupForSymbolicDisassembly() call then that function is called +/// to get any symbolic information at the Address for this instruction. If +/// that returns non-zero then the symbolic information it returns is used to +/// create an MCExpr and that is added as an operand to the MCInst. If +/// getOpInfo() returns zero and isBranch is true then a symbol look up for +/// Value is done and if a symbol is found an MCExpr is created with that, else +/// an MCExpr with Value is created. This function returns true if it adds an +/// operand to the MCInst and false otherwise. +static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value, + bool isBranch, uint64_t InstSize, + MCInst &MI, const void *Decoder) { + const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); + LLVMOpInfoCallback getOpInfo = Dis->getLLVMOpInfoCallback(); + if (!getOpInfo) + return false; + + struct LLVMOpInfo1 SymbolicOp; + SymbolicOp.Value = Value; + void *DisInfo = Dis->getDisInfoBlock(); + if (!getOpInfo(DisInfo, Address, 0 /* Offset */, InstSize, 1, &SymbolicOp)) { + if (isBranch) { + LLVMSymbolLookupCallback SymbolLookUp = + Dis->getLLVMSymbolLookupCallback(); + if (SymbolLookUp) { + uint64_t ReferenceType; + ReferenceType = LLVMDisassembler_ReferenceType_In_Branch; + const char *ReferenceName; + const char *Name = SymbolLookUp(DisInfo, Value, &ReferenceType, Address, + &ReferenceName); + if (Name) { + SymbolicOp.AddSymbol.Name = Name; + SymbolicOp.AddSymbol.Present = true; + SymbolicOp.Value = 0; + } + else { + SymbolicOp.Value = Value; + } + if(ReferenceType == LLVMDisassembler_ReferenceType_Out_SymbolStub) + (*Dis->CommentStream) << "symbol stub for: " << ReferenceName; + } + else { + return false; + } + } + else { + return false; + } + } + + MCContext *Ctx = Dis->getMCContext(); + const MCExpr *Add = NULL; + if (SymbolicOp.AddSymbol.Present) { + if (SymbolicOp.AddSymbol.Name) { + StringRef Name(SymbolicOp.AddSymbol.Name); + MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name); + Add = MCSymbolRefExpr::Create(Sym, *Ctx); + } else { + Add = MCConstantExpr::Create(SymbolicOp.AddSymbol.Value, *Ctx); + } + } + + const MCExpr *Sub = NULL; + if (SymbolicOp.SubtractSymbol.Present) { + if (SymbolicOp.SubtractSymbol.Name) { + StringRef Name(SymbolicOp.SubtractSymbol.Name); + MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name); + Sub = MCSymbolRefExpr::Create(Sym, *Ctx); + } else { + Sub = MCConstantExpr::Create(SymbolicOp.SubtractSymbol.Value, *Ctx); + } + } + + const MCExpr *Off = NULL; + if (SymbolicOp.Value != 0) + Off = MCConstantExpr::Create(SymbolicOp.Value, *Ctx); + + const MCExpr *Expr; + if (Sub) { + const MCExpr *LHS; + if (Add) + LHS = MCBinaryExpr::CreateSub(Add, Sub, *Ctx); else - os << " 0"; - os << (i%4 == 1 ? '|' : ':'); - } - os << '\n'; - // Split the bit position markers into more than one lines to fit 80 columns. - os << "---------------------------------------------------------------" - << "----------------------------------\n"; - os << '\n'; -} - -/// decodeARMInstruction is a decorator function which tries special cases of -/// instruction matching before calling the auto-generated decoder function. -static unsigned decodeARMInstruction(uint32_t &insn) { - if (slice(insn, 31, 28) == 15) - goto AutoGenedDecoder; - - // Special case processing, if any, goes here.... - - // LLVM combines the offset mode of A8.6.197 & A8.6.198 into STRB. - // The insufficient encoding information of the combined instruction confuses - // the decoder wrt BFC/BFI. Therefore, we try to recover here. - // For BFC, Inst{27-21} = 0b0111110 & Inst{6-0} = 0b0011111. - // For BFI, Inst{27-21} = 0b0111110 & Inst{6-4} = 0b001 & Inst{3-0} =! 0b1111. - if (slice(insn, 27, 21) == 0x3e && slice(insn, 6, 4) == 1) { - if (slice(insn, 3, 0) == 15) - return ARM::BFC; + LHS = MCUnaryExpr::CreateMinus(Sub, *Ctx); + if (Off != 0) + Expr = MCBinaryExpr::CreateAdd(LHS, Off, *Ctx); else - return ARM::BFI; - } - - // Ditto for STRBT, which is a super-instruction for A8.6.199 Encodings - // A1 & A2. - // As a result, the decoder fails to deocode USAT properly. - if (slice(insn, 27, 21) == 0x37 && slice(insn, 5, 4) == 1) - return ARM::USAT; - // As a result, the decoder fails to deocode UQADD16 properly. - if (slice(insn, 27, 20) == 0x66 && slice(insn, 7, 4) == 1) - return ARM::UQADD16; - - // Ditto for ADDSrs, which is a super-instruction for A8.6.7 & A8.6.8. - // As a result, the decoder fails to decode UMULL properly. - if (slice(insn, 27, 21) == 0x04 && slice(insn, 7, 4) == 9) { - return ARM::UMULL; - } - - // Ditto for STR_PRE, which is a super-instruction for A8.6.194 & A8.6.195. - // As a result, the decoder fails to decode SBFX properly. - if (slice(insn, 27, 21) == 0x3d && slice(insn, 6, 4) == 5) - return ARM::SBFX; - - // And STRB_PRE, which is a super-instruction for A8.6.197 & A8.6.198. - // As a result, the decoder fails to decode UBFX properly. - if (slice(insn, 27, 21) == 0x3f && slice(insn, 6, 4) == 5) - return ARM::UBFX; - - // Ditto for STRT, which is a super-instruction for A8.6.210 Encoding A1 & A2. - // As a result, the decoder fails to deocode SSAT properly. - if (slice(insn, 27, 21) == 0x35 && slice(insn, 5, 4) == 1) - return ARM::SSAT; - - // Ditto for RSCrs, which is a super-instruction for A8.6.146 & A8.6.147. - // As a result, the decoder fails to decode STRHT/LDRHT/LDRSHT/LDRSBT. - if (slice(insn, 27, 24) == 0) { - switch (slice(insn, 21, 20)) { - case 2: - switch (slice(insn, 7, 4)) { - case 11: - return ARM::STRHT; - default: - break; // fallthrough + Expr = LHS; + } else if (Add) { + if (Off != 0) + Expr = MCBinaryExpr::CreateAdd(Add, Off, *Ctx); + else + Expr = Add; + } else { + if (Off != 0) + Expr = Off; + else + Expr = MCConstantExpr::Create(0, *Ctx); + } + + if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_HI16) + MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateUpper16(Expr, *Ctx))); + else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_LO16) + MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateLower16(Expr, *Ctx))); + else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_None) + MI.addOperand(MCOperand::CreateExpr(Expr)); + else + assert(0 && "bad SymbolicOp.VariantKind"); + + return true; +} + +/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being +/// referenced by a load instruction with the base register that is the Pc. +/// These can often be values in a literal pool near the Address of the +/// instruction. The Address of the instruction and its immediate Value are +/// used as a possible literal pool entry. The SymbolLookUp call back will +/// return the name of a symbol referenced by the the literal pool's entry if +/// the referenced address is that of a symbol. Or it will return a pointer to +/// a literal 'C' string if the referenced address of the literal pool's entry +/// is an address into a section with 'C' string literals. +static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value, + const void *Decoder) { + const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); + LLVMSymbolLookupCallback SymbolLookUp = Dis->getLLVMSymbolLookupCallback(); + if (SymbolLookUp) { + void *DisInfo = Dis->getDisInfoBlock(); + uint64_t ReferenceType; + ReferenceType = LLVMDisassembler_ReferenceType_In_PCrel_Load; + const char *ReferenceName; + (void)SymbolLookUp(DisInfo, Value, &ReferenceType, Address, &ReferenceName); + if(ReferenceType == LLVMDisassembler_ReferenceType_Out_LitPool_SymAddr || + ReferenceType == LLVMDisassembler_ReferenceType_Out_LitPool_CstrAddr) + (*Dis->CommentStream) << "literal pool for: " << ReferenceName; + } +} + +// Thumb1 instructions don't have explicit S bits. Rather, they +// implicitly set CPSR. Since it's not represented in the encoding, the +// auto-generated decoder won't inject the CPSR operand. We need to fix +// that as a post-pass. +static void AddThumb1SBit(MCInst &MI, bool InITBlock) { + const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; + unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; + MCInst::iterator I = MI.begin(); + for (unsigned i = 0; i < NumOps; ++i, ++I) { + if (I == MI.end()) break; + if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) { + if (i > 0 && OpInfo[i-1].isPredicate()) continue; + MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR)); + return; + } + } + + MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR)); +} + +// Most Thumb instructions don't have explicit predicates in the +// encoding, but rather get their predicates from IT context. We need +// to fix up the predicate operands using this context information as a +// post-pass. +MCDisassembler::DecodeStatus +ThumbDisassembler::AddThumbPredicate(MCInst &MI) const { + MCDisassembler::DecodeStatus S = Success; + + // A few instructions actually have predicates encoded in them. Don't + // try to overwrite it if we're seeing one of those. + switch (MI.getOpcode()) { + case ARM::tBcc: + case ARM::t2Bcc: + case ARM::tCBZ: + case ARM::tCBNZ: + case ARM::tCPS: + case ARM::t2CPS3p: + case ARM::t2CPS2p: + case ARM::t2CPS1p: + case ARM::tMOVSr: + case ARM::tSETEND: + // Some instructions (mostly conditional branches) are not + // allowed in IT blocks. + if (!ITBlock.empty()) + S = SoftFail; + else + return Success; + break; + case ARM::tB: + case ARM::t2B: + case ARM::t2TBB: + case ARM::t2TBH: + // Some instructions (mostly unconditional branches) can + // only appears at the end of, or outside of, an IT. + if (ITBlock.size() > 1) + S = SoftFail; + break; + default: + break; + } + + // If we're in an IT block, base the predicate on that. Otherwise, + // assume a predicate of AL. + unsigned CC; + if (!ITBlock.empty()) { + CC = ITBlock.back(); + if (CC == 0xF) + CC = ARMCC::AL; + ITBlock.pop_back(); + } else + CC = ARMCC::AL; + + const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; + unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; + MCInst::iterator I = MI.begin(); + for (unsigned i = 0; i < NumOps; ++i, ++I) { + if (I == MI.end()) break; + if (OpInfo[i].isPredicate()) { + I = MI.insert(I, MCOperand::CreateImm(CC)); + ++I; + if (CC == ARMCC::AL) + MI.insert(I, MCOperand::CreateReg(0)); + else + MI.insert(I, MCOperand::CreateReg(ARM::CPSR)); + return S; + } + } + + I = MI.insert(I, MCOperand::CreateImm(CC)); + ++I; + if (CC == ARMCC::AL) + MI.insert(I, MCOperand::CreateReg(0)); + else + MI.insert(I, MCOperand::CreateReg(ARM::CPSR)); + + return S; +} + +// Thumb VFP instructions are a special case. Because we share their +// encodings between ARM and Thumb modes, and they are predicable in ARM +// mode, the auto-generated decoder will give them an (incorrect) +// predicate operand. We need to rewrite these operands based on the IT +// context as a post-pass. +void ThumbDisassembler::UpdateThumbVFPPredicate(MCInst &MI) const { + unsigned CC; + if (!ITBlock.empty()) { + CC = ITBlock.back(); + ITBlock.pop_back(); + } else + CC = ARMCC::AL; + + const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo; + MCInst::iterator I = MI.begin(); + unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands; + for (unsigned i = 0; i < NumOps; ++i, ++I) { + if (OpInfo[i].isPredicate() ) { + I->setImm(CC); + ++I; + if (CC == ARMCC::AL) + I->setReg(0); + else + I->setReg(ARM::CPSR); + return; + } + } +} + +DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size, + const MemoryObject &Region, + uint64_t Address, + raw_ostream &os, + raw_ostream &cs) const { + CommentStream = &cs; + + uint8_t bytes[4]; + + assert((STI.getFeatureBits() & ARM::ModeThumb) && + "Asked to disassemble in Thumb mode but Subtarget is in ARM mode!"); + + // We want to read exactly 2 bytes of data. + if (Region.readBytes(Address, 2, (uint8_t*)bytes, NULL) == -1) { + Size = 0; + return MCDisassembler::Fail; + } + + uint16_t insn16 = (bytes[1] << 8) | bytes[0]; + DecodeStatus result = decodeThumbInstruction16(MI, insn16, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 2; + Check(result, AddThumbPredicate(MI)); + return result; + } + + MI.clear(); + result = decodeThumbSBitInstruction16(MI, insn16, Address, this, STI); + if (result) { + Size = 2; + bool InITBlock = !ITBlock.empty(); + Check(result, AddThumbPredicate(MI)); + AddThumb1SBit(MI, InITBlock); + return result; + } + + MI.clear(); + result = decodeThumb2Instruction16(MI, insn16, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 2; + + // Nested IT blocks are UNPREDICTABLE. Must be checked before we add + // the Thumb predicate. + if (MI.getOpcode() == ARM::t2IT && !ITBlock.empty()) + result = MCDisassembler::SoftFail; + + Check(result, AddThumbPredicate(MI)); + + // If we find an IT instruction, we need to parse its condition + // code and mask operands so that we can apply them correctly + // to the subsequent instructions. + if (MI.getOpcode() == ARM::t2IT) { + + // (3 - the number of trailing zeros) is the number of then / else. + unsigned firstcond = MI.getOperand(0).getImm(); + unsigned Mask = MI.getOperand(1).getImm(); + unsigned CondBit0 = Mask >> 4 & 1; + unsigned NumTZ = CountTrailingZeros_32(Mask); + assert(NumTZ <= 3 && "Invalid IT mask!"); + for (unsigned Pos = 3, e = NumTZ; Pos > e; --Pos) { + bool T = ((Mask >> Pos) & 1) == CondBit0; + if (T) + ITBlock.insert(ITBlock.begin(), firstcond); + else + ITBlock.insert(ITBlock.begin(), firstcond ^ 1); } + + ITBlock.push_back(firstcond); + } + + return result; + } + + // We want to read exactly 4 bytes of data. + if (Region.readBytes(Address, 4, (uint8_t*)bytes, NULL) == -1) { + Size = 0; + return MCDisassembler::Fail; + } + + uint32_t insn32 = (bytes[3] << 8) | + (bytes[2] << 0) | + (bytes[1] << 24) | + (bytes[0] << 16); + MI.clear(); + result = decodeThumbInstruction32(MI, insn32, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + bool InITBlock = ITBlock.size(); + Check(result, AddThumbPredicate(MI)); + AddThumb1SBit(MI, InITBlock); + return result; + } + + MI.clear(); + result = decodeThumb2Instruction32(MI, insn32, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + Check(result, AddThumbPredicate(MI)); + return result; + } + + MI.clear(); + result = decodeVFPInstruction32(MI, insn32, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + UpdateThumbVFPPredicate(MI); + return result; + } + + MI.clear(); + result = decodeNEONDupInstruction32(MI, insn32, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + Check(result, AddThumbPredicate(MI)); + return result; + } + + if (fieldFromInstruction32(insn32, 24, 8) == 0xF9) { + MI.clear(); + uint32_t NEONLdStInsn = insn32; + NEONLdStInsn &= 0xF0FFFFFF; + NEONLdStInsn |= 0x04000000; + result = decodeNEONLoadStoreInstruction32(MI, NEONLdStInsn, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + Check(result, AddThumbPredicate(MI)); + return result; + } + } + + if (fieldFromInstruction32(insn32, 24, 4) == 0xF) { + MI.clear(); + uint32_t NEONDataInsn = insn32; + NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24 + NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24 + NEONDataInsn |= 0x12000000; // Set bits 28 and 25 + result = decodeNEONDataInstruction32(MI, NEONDataInsn, Address, this, STI); + if (result != MCDisassembler::Fail) { + Size = 4; + Check(result, AddThumbPredicate(MI)); + return result; + } + } + + Size = 0; + return MCDisassembler::Fail; +} + + +extern "C" void LLVMInitializeARMDisassembler() { + TargetRegistry::RegisterMCDisassembler(TheARMTarget, + createARMDisassembler); + TargetRegistry::RegisterMCDisassembler(TheThumbTarget, + createThumbDisassembler); +} + +static const unsigned GPRDecoderTable[] = { + ARM::R0, ARM::R1, ARM::R2, ARM::R3, + ARM::R4, ARM::R5, ARM::R6, ARM::R7, + ARM::R8, ARM::R9, ARM::R10, ARM::R11, + ARM::R12, ARM::SP, ARM::LR, ARM::PC +}; + +static DecodeStatus DecodeGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo > 15) + return MCDisassembler::Fail; + + unsigned Register = GPRDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Register)); + return MCDisassembler::Success; +} + +static DecodeStatus +DecodeGPRnopcRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo == 15) return MCDisassembler::Fail; + return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); +} + +static DecodeStatus DecodetGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo > 7) + return MCDisassembler::Fail; + return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); +} + +static DecodeStatus DecodetcGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + unsigned Register = 0; + switch (RegNo) { + case 0: + Register = ARM::R0; + break; + case 1: + Register = ARM::R1; + break; + case 2: + Register = ARM::R2; break; case 3: - switch (slice(insn, 7, 4)) { - case 11: - return ARM::LDRHT; - case 13: - return ARM::LDRSBT; - case 15: - return ARM::LDRSHT; - default: - break; // fallthrough - } + Register = ARM::R3; + break; + case 9: + Register = ARM::R9; + break; + case 12: + Register = ARM::R12; break; default: - break; // fallthrough + return MCDisassembler::Fail; } + + Inst.addOperand(MCOperand::CreateReg(Register)); + return MCDisassembler::Success; +} + +static DecodeStatus DecoderGPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo == 13 || RegNo == 15) return MCDisassembler::Fail; + return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); +} + +static const unsigned SPRDecoderTable[] = { + ARM::S0, ARM::S1, ARM::S2, ARM::S3, + ARM::S4, ARM::S5, ARM::S6, ARM::S7, + ARM::S8, ARM::S9, ARM::S10, ARM::S11, + ARM::S12, ARM::S13, ARM::S14, ARM::S15, + ARM::S16, ARM::S17, ARM::S18, ARM::S19, + ARM::S20, ARM::S21, ARM::S22, ARM::S23, + ARM::S24, ARM::S25, ARM::S26, ARM::S27, + ARM::S28, ARM::S29, ARM::S30, ARM::S31 +}; + +static DecodeStatus DecodeSPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Register = SPRDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Register)); + return MCDisassembler::Success; +} + +static const unsigned DPRDecoderTable[] = { + ARM::D0, ARM::D1, ARM::D2, ARM::D3, + ARM::D4, ARM::D5, ARM::D6, ARM::D7, + ARM::D8, ARM::D9, ARM::D10, ARM::D11, + ARM::D12, ARM::D13, ARM::D14, ARM::D15, + ARM::D16, ARM::D17, ARM::D18, ARM::D19, + ARM::D20, ARM::D21, ARM::D22, ARM::D23, + ARM::D24, ARM::D25, ARM::D26, ARM::D27, + ARM::D28, ARM::D29, ARM::D30, ARM::D31 +}; + +static DecodeStatus DecodeDPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Register = DPRDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Register)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeDPR_8RegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo > 7) + return MCDisassembler::Fail; + return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); +} + +static DecodeStatus +DecodeDPR_VFP2RegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo > 15) + return MCDisassembler::Fail; + return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); +} + +static const unsigned QPRDecoderTable[] = { + ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3, + ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7, + ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11, + ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15 +}; + + +static DecodeStatus DecodeQPRRegisterClass(llvm::MCInst &Inst, unsigned RegNo, + uint64_t Address, const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + RegNo >>= 1; + + unsigned Register = QPRDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Register)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodePredicateOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + if (Val == 0xF) return MCDisassembler::Fail; + // AL predicate is not allowed on Thumb1 branches. + if (Inst.getOpcode() == ARM::tBcc && Val == 0xE) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(Val)); + if (Val == ARMCC::AL) { + Inst.addOperand(MCOperand::CreateReg(0)); + } else + Inst.addOperand(MCOperand::CreateReg(ARM::CPSR)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCCOutOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + if (Val) + Inst.addOperand(MCOperand::CreateReg(ARM::CPSR)); + else + Inst.addOperand(MCOperand::CreateReg(0)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeSOImmOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + uint32_t imm = Val & 0xFF; + uint32_t rot = (Val & 0xF00) >> 7; + uint32_t rot_imm = (imm >> rot) | (imm << ((32-rot) & 0x1F)); + Inst.addOperand(MCOperand::CreateImm(rot_imm)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeSORegImmOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rm = fieldFromInstruction32(Val, 0, 4); + unsigned type = fieldFromInstruction32(Val, 5, 2); + unsigned imm = fieldFromInstruction32(Val, 7, 5); + + // Register-immediate + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + + ARM_AM::ShiftOpc Shift = ARM_AM::lsl; + switch (type) { + case 0: + Shift = ARM_AM::lsl; + break; + case 1: + Shift = ARM_AM::lsr; + break; + case 2: + Shift = ARM_AM::asr; + break; + case 3: + Shift = ARM_AM::ror; + break; } - // Ditto for SBCrs, which is a super-instruction for A8.6.152 & A8.6.153. - // As a result, the decoder fails to decode STRH_Post/LDRD_POST/STRD_POST - // properly. - if (slice(insn, 27, 25) == 0 && slice(insn, 20, 20) == 0) { - unsigned PW = slice(insn, 24, 24) << 1 | slice(insn, 21, 21); - switch (slice(insn, 7, 4)) { - case 11: - switch (PW) { - case 2: // Offset - return ARM::STRH; - case 3: // Pre-indexed - return ARM::STRH_PRE; - case 0: // Post-indexed - return ARM::STRH_POST; - default: - break; // fallthrough - } + if (Shift == ARM_AM::ror && imm == 0) + Shift = ARM_AM::rrx; + + unsigned Op = Shift | (imm << 3); + Inst.addOperand(MCOperand::CreateImm(Op)); + + return S; +} + +static DecodeStatus DecodeSORegRegOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rm = fieldFromInstruction32(Val, 0, 4); + unsigned type = fieldFromInstruction32(Val, 5, 2); + unsigned Rs = fieldFromInstruction32(Val, 8, 4); + + // Register-register + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder))) + return MCDisassembler::Fail; + + ARM_AM::ShiftOpc Shift = ARM_AM::lsl; + switch (type) { + case 0: + Shift = ARM_AM::lsl; break; - case 13: - switch (PW) { - case 2: // Offset - return ARM::LDRD; - case 3: // Pre-indexed - return ARM::LDRD_PRE; - case 0: // Post-indexed - return ARM::LDRD_POST; - default: - break; // fallthrough - } + case 1: + Shift = ARM_AM::lsr; break; - case 15: - switch (PW) { - case 2: // Offset - return ARM::STRD; - case 3: // Pre-indexed - return ARM::STRD_PRE; - case 0: // Post-indexed - return ARM::STRD_POST; - default: - break; // fallthrough - } + case 2: + Shift = ARM_AM::asr; break; + case 3: + Shift = ARM_AM::ror; + break; + } + + Inst.addOperand(MCOperand::CreateImm(Shift)); + + return S; +} + +static DecodeStatus DecodeRegListOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + bool writebackLoad = false; + unsigned writebackReg = 0; + switch (Inst.getOpcode()) { default: - break; // fallthrough + break; + case ARM::LDMIA_UPD: + case ARM::LDMDB_UPD: + case ARM::LDMIB_UPD: + case ARM::LDMDA_UPD: + case ARM::t2LDMIA_UPD: + case ARM::t2LDMDB_UPD: + writebackLoad = true; + writebackReg = Inst.getOperand(0).getReg(); + break; + } + + // Empty register lists are not allowed. + if (CountPopulation_32(Val) == 0) return MCDisassembler::Fail; + for (unsigned i = 0; i < 16; ++i) { + if (Val & (1 << i)) { + if (!Check(S, DecodeGPRRegisterClass(Inst, i, Address, Decoder))) + return MCDisassembler::Fail; + // Writeback not allowed if Rn is in the target list. + if (writebackLoad && writebackReg == Inst.end()[-1].getReg()) + Check(S, MCDisassembler::SoftFail); } } - // Ditto for SBCSSrs, which is a super-instruction for A8.6.152 & A8.6.153. - // As a result, the decoder fails to decode LDRH_POST/LDRSB_POST/LDRSH_POST - // properly. - if (slice(insn, 27, 25) == 0 && slice(insn, 20, 20) == 1) { - unsigned PW = slice(insn, 24, 24) << 1 | slice(insn, 21, 21); - switch (slice(insn, 7, 4)) { - case 11: - switch (PW) { - case 2: // Offset - return ARM::LDRH; - case 3: // Pre-indexed - return ARM::LDRH_PRE; - case 0: // Post-indexed - return ARM::LDRH_POST; - default: - break; // fallthrough - } + return S; +} + +static DecodeStatus DecodeSPRRegListOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Vd = fieldFromInstruction32(Val, 8, 4); + unsigned regs = Val & 0xFF; + + if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder))) + return MCDisassembler::Fail; + for (unsigned i = 0; i < (regs - 1); ++i) { + if (!Check(S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; +} + +static DecodeStatus DecodeDPRRegListOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Vd = fieldFromInstruction32(Val, 8, 4); + unsigned regs = (Val & 0xFF) / 2; + + if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) + return MCDisassembler::Fail; + for (unsigned i = 0; i < (regs - 1); ++i) { + if (!Check(S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; +} + +static DecodeStatus DecodeBitfieldMaskOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + // This operand encodes a mask of contiguous zeros between a specified MSB + // and LSB. To decode it, we create the mask of all bits MSB-and-lower, + // the mask of all bits LSB-and-lower, and then xor them to create + // the mask of that's all ones on [msb, lsb]. Finally we not it to + // create the final mask. + unsigned msb = fieldFromInstruction32(Val, 5, 5); + unsigned lsb = fieldFromInstruction32(Val, 0, 5); + + DecodeStatus S = MCDisassembler::Success; + if (lsb > msb) Check(S, MCDisassembler::SoftFail); + + uint32_t msb_mask = 0xFFFFFFFF; + if (msb != 31) msb_mask = (1U << (msb+1)) - 1; + uint32_t lsb_mask = (1U << lsb) - 1; + + Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask))); + return S; +} + +static DecodeStatus DecodeCopMemInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + unsigned CRd = fieldFromInstruction32(Insn, 12, 4); + unsigned coproc = fieldFromInstruction32(Insn, 8, 4); + unsigned imm = fieldFromInstruction32(Insn, 0, 8); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned U = fieldFromInstruction32(Insn, 23, 1); + + switch (Inst.getOpcode()) { + case ARM::LDC_OFFSET: + case ARM::LDC_PRE: + case ARM::LDC_POST: + case ARM::LDC_OPTION: + case ARM::LDCL_OFFSET: + case ARM::LDCL_PRE: + case ARM::LDCL_POST: + case ARM::LDCL_OPTION: + case ARM::STC_OFFSET: + case ARM::STC_PRE: + case ARM::STC_POST: + case ARM::STC_OPTION: + case ARM::STCL_OFFSET: + case ARM::STCL_PRE: + case ARM::STCL_POST: + case ARM::STCL_OPTION: + case ARM::t2LDC_OFFSET: + case ARM::t2LDC_PRE: + case ARM::t2LDC_POST: + case ARM::t2LDC_OPTION: + case ARM::t2LDCL_OFFSET: + case ARM::t2LDCL_PRE: + case ARM::t2LDCL_POST: + case ARM::t2LDCL_OPTION: + case ARM::t2STC_OFFSET: + case ARM::t2STC_PRE: + case ARM::t2STC_POST: + case ARM::t2STC_OPTION: + case ARM::t2STCL_OFFSET: + case ARM::t2STCL_PRE: + case ARM::t2STCL_POST: + case ARM::t2STCL_OPTION: + if (coproc == 0xA || coproc == 0xB) + return MCDisassembler::Fail; + break; + default: break; - case 13: - switch (PW) { - case 2: // Offset - return ARM::LDRSB; - case 3: // Pre-indexed - return ARM::LDRSB_PRE; - case 0: // Post-indexed - return ARM::LDRSB_POST; + } + + Inst.addOperand(MCOperand::CreateImm(coproc)); + Inst.addOperand(MCOperand::CreateImm(CRd)); + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + unsigned P = fieldFromInstruction32(Insn, 24, 1); + unsigned W = fieldFromInstruction32(Insn, 21, 1); + + bool writeback = (P == 0) || (W == 1); + unsigned idx_mode = 0; + if (P && writeback) + idx_mode = ARMII::IndexModePre; + else if (!P && writeback) + idx_mode = ARMII::IndexModePost; + + switch (Inst.getOpcode()) { + case ARM::t2LDC2_OFFSET: + case ARM::t2LDC2L_OFFSET: + case ARM::t2LDC2_PRE: + case ARM::t2LDC2L_PRE: + case ARM::t2STC2_OFFSET: + case ARM::t2STC2L_OFFSET: + case ARM::t2STC2_PRE: + case ARM::t2STC2L_PRE: + case ARM::LDC2_OFFSET: + case ARM::LDC2L_OFFSET: + case ARM::LDC2_PRE: + case ARM::LDC2L_PRE: + case ARM::STC2_OFFSET: + case ARM::STC2L_OFFSET: + case ARM::STC2_PRE: + case ARM::STC2L_PRE: + case ARM::t2LDC_OFFSET: + case ARM::t2LDCL_OFFSET: + case ARM::t2LDC_PRE: + case ARM::t2LDCL_PRE: + case ARM::t2STC_OFFSET: + case ARM::t2STCL_OFFSET: + case ARM::t2STC_PRE: + case ARM::t2STCL_PRE: + case ARM::LDC_OFFSET: + case ARM::LDCL_OFFSET: + case ARM::LDC_PRE: + case ARM::LDCL_PRE: + case ARM::STC_OFFSET: + case ARM::STCL_OFFSET: + case ARM::STC_PRE: + case ARM::STCL_PRE: + imm = ARM_AM::getAM5Opc(U ? ARM_AM::add : ARM_AM::sub, imm); + Inst.addOperand(MCOperand::CreateImm(imm)); + break; + case ARM::t2LDC2_POST: + case ARM::t2LDC2L_POST: + case ARM::t2STC2_POST: + case ARM::t2STC2L_POST: + case ARM::LDC2_POST: + case ARM::LDC2L_POST: + case ARM::STC2_POST: + case ARM::STC2L_POST: + case ARM::t2LDC_POST: + case ARM::t2LDCL_POST: + case ARM::t2STC_POST: + case ARM::t2STCL_POST: + case ARM::LDC_POST: + case ARM::LDCL_POST: + case ARM::STC_POST: + case ARM::STCL_POST: + imm |= U << 8; + // fall through. + default: + // The 'option' variant doesn't encode 'U' in the immediate since + // the immediate is unsigned [0,255]. + Inst.addOperand(MCOperand::CreateImm(imm)); + break; + } + + switch (Inst.getOpcode()) { + case ARM::LDC_OFFSET: + case ARM::LDC_PRE: + case ARM::LDC_POST: + case ARM::LDC_OPTION: + case ARM::LDCL_OFFSET: + case ARM::LDCL_PRE: + case ARM::LDCL_POST: + case ARM::LDCL_OPTION: + case ARM::STC_OFFSET: + case ARM::STC_PRE: + case ARM::STC_POST: + case ARM::STC_OPTION: + case ARM::STCL_OFFSET: + case ARM::STCL_PRE: + case ARM::STCL_POST: + case ARM::STCL_OPTION: + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + return S; +} + +static DecodeStatus +DecodeAddrMode2IdxInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned imm = fieldFromInstruction32(Insn, 0, 12); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + unsigned reg = fieldFromInstruction32(Insn, 25, 1); + unsigned P = fieldFromInstruction32(Insn, 24, 1); + unsigned W = fieldFromInstruction32(Insn, 21, 1); + + // On stores, the writeback operand precedes Rt. + switch (Inst.getOpcode()) { + case ARM::STR_POST_IMM: + case ARM::STR_POST_REG: + case ARM::STRB_POST_IMM: + case ARM::STRB_POST_REG: + case ARM::STRT_POST_REG: + case ARM::STRT_POST_IMM: + case ARM::STRBT_POST_REG: + case ARM::STRBT_POST_IMM: + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + + // On loads, the writeback operand comes after Rt. + switch (Inst.getOpcode()) { + case ARM::LDR_POST_IMM: + case ARM::LDR_POST_REG: + case ARM::LDRB_POST_IMM: + case ARM::LDRB_POST_REG: + case ARM::LDRBT_POST_REG: + case ARM::LDRBT_POST_IMM: + case ARM::LDRT_POST_REG: + case ARM::LDRT_POST_IMM: + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + ARM_AM::AddrOpc Op = ARM_AM::add; + if (!fieldFromInstruction32(Insn, 23, 1)) + Op = ARM_AM::sub; + + bool writeback = (P == 0) || (W == 1); + unsigned idx_mode = 0; + if (P && writeback) + idx_mode = ARMII::IndexModePre; + else if (!P && writeback) + idx_mode = ARMII::IndexModePost; + + if (writeback && (Rn == 15 || Rn == Rt)) + S = MCDisassembler::SoftFail; // UNPREDICTABLE + + if (reg) { + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + ARM_AM::ShiftOpc Opc = ARM_AM::lsl; + switch( fieldFromInstruction32(Insn, 5, 2)) { + case 0: + Opc = ARM_AM::lsl; + break; + case 1: + Opc = ARM_AM::lsr; + break; + case 2: + Opc = ARM_AM::asr; + break; + case 3: + Opc = ARM_AM::ror; + break; default: - break; // fallthrough - } + return MCDisassembler::Fail; + } + unsigned amt = fieldFromInstruction32(Insn, 7, 5); + unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode); + + Inst.addOperand(MCOperand::CreateImm(imm)); + } else { + Inst.addOperand(MCOperand::CreateReg(0)); + unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode); + Inst.addOperand(MCOperand::CreateImm(tmp)); + } + + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeSORegMemOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 13, 4); + unsigned Rm = fieldFromInstruction32(Val, 0, 4); + unsigned type = fieldFromInstruction32(Val, 5, 2); + unsigned imm = fieldFromInstruction32(Val, 7, 5); + unsigned U = fieldFromInstruction32(Val, 12, 1); + + ARM_AM::ShiftOpc ShOp = ARM_AM::lsl; + switch (type) { + case 0: + ShOp = ARM_AM::lsl; + break; + case 1: + ShOp = ARM_AM::lsr; + break; + case 2: + ShOp = ARM_AM::asr; + break; + case 3: + ShOp = ARM_AM::ror; + break; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + unsigned shift; + if (U) + shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp); + else + shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp); + Inst.addOperand(MCOperand::CreateImm(shift)); + + return S; +} + +static DecodeStatus +DecodeAddrMode3Instruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned type = fieldFromInstruction32(Insn, 22, 1); + unsigned imm = fieldFromInstruction32(Insn, 8, 4); + unsigned U = ((~fieldFromInstruction32(Insn, 23, 1)) & 1) << 8; + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + unsigned W = fieldFromInstruction32(Insn, 21, 1); + unsigned P = fieldFromInstruction32(Insn, 24, 1); + + bool writeback = (W == 1) | (P == 0); + + // For {LD,ST}RD, Rt must be even, else undefined. + switch (Inst.getOpcode()) { + case ARM::STRD: + case ARM::STRD_PRE: + case ARM::STRD_POST: + case ARM::LDRD: + case ARM::LDRD_PRE: + case ARM::LDRD_POST: + if (Rt & 0x1) return MCDisassembler::Fail; + break; + default: + break; + } + + if (writeback) { // Writeback + if (P) + U |= ARMII::IndexModePre << 9; + else + U |= ARMII::IndexModePost << 9; + + // On stores, the writeback operand precedes Rt. + switch (Inst.getOpcode()) { + case ARM::STRD: + case ARM::STRD_PRE: + case ARM::STRD_POST: + case ARM::STRH: + case ARM::STRH_PRE: + case ARM::STRH_POST: + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + switch (Inst.getOpcode()) { + case ARM::STRD: + case ARM::STRD_PRE: + case ARM::STRD_POST: + case ARM::LDRD: + case ARM::LDRD_PRE: + case ARM::LDRD_POST: + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) + return MCDisassembler::Fail; break; - case 15: - switch (PW) { - case 2: // Offset - return ARM::LDRSH; - case 3: // Pre-indexed - return ARM::LDRSH_PRE; - case 0: // Post-indexed - return ARM::LDRSH_POST; + default: + break; + } + + if (writeback) { + // On loads, the writeback operand comes after Rt. + switch (Inst.getOpcode()) { + case ARM::LDRD: + case ARM::LDRD_PRE: + case ARM::LDRD_POST: + case ARM::LDRH: + case ARM::LDRH_PRE: + case ARM::LDRH_POST: + case ARM::LDRSH: + case ARM::LDRSH_PRE: + case ARM::LDRSH_POST: + case ARM::LDRSB: + case ARM::LDRSB_PRE: + case ARM::LDRSB_POST: + case ARM::LDRHTr: + case ARM::LDRSBTr: + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + if (type) { + Inst.addOperand(MCOperand::CreateReg(0)); + Inst.addOperand(MCOperand::CreateImm(U | (imm << 4) | Rm)); + } else { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(U)); + } + + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeRFEInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned mode = fieldFromInstruction32(Insn, 23, 2); + + switch (mode) { + case 0: + mode = ARM_AM::da; + break; + case 1: + mode = ARM_AM::ia; + break; + case 2: + mode = ARM_AM::db; + break; + case 3: + mode = ARM_AM::ib; + break; + } + + Inst.addOperand(MCOperand::CreateImm(mode)); + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeMemMultipleWritebackInstruction(llvm::MCInst &Inst, + unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + unsigned reglist = fieldFromInstruction32(Insn, 0, 16); + + if (pred == 0xF) { + switch (Inst.getOpcode()) { + case ARM::LDMDA: + Inst.setOpcode(ARM::RFEDA); + break; + case ARM::LDMDA_UPD: + Inst.setOpcode(ARM::RFEDA_UPD); + break; + case ARM::LDMDB: + Inst.setOpcode(ARM::RFEDB); + break; + case ARM::LDMDB_UPD: + Inst.setOpcode(ARM::RFEDB_UPD); + break; + case ARM::LDMIA: + Inst.setOpcode(ARM::RFEIA); + break; + case ARM::LDMIA_UPD: + Inst.setOpcode(ARM::RFEIA_UPD); + break; + case ARM::LDMIB: + Inst.setOpcode(ARM::RFEIB); + break; + case ARM::LDMIB_UPD: + Inst.setOpcode(ARM::RFEIB_UPD); + break; + case ARM::STMDA: + Inst.setOpcode(ARM::SRSDA); + break; + case ARM::STMDA_UPD: + Inst.setOpcode(ARM::SRSDA_UPD); + break; + case ARM::STMDB: + Inst.setOpcode(ARM::SRSDB); + break; + case ARM::STMDB_UPD: + Inst.setOpcode(ARM::SRSDB_UPD); + break; + case ARM::STMIA: + Inst.setOpcode(ARM::SRSIA); + break; + case ARM::STMIA_UPD: + Inst.setOpcode(ARM::SRSIA_UPD); + break; + case ARM::STMIB: + Inst.setOpcode(ARM::SRSIB); + break; + case ARM::STMIB_UPD: + Inst.setOpcode(ARM::SRSIB_UPD); + break; default: - break; // fallthrough - } + if (!Check(S, MCDisassembler::Fail)) return MCDisassembler::Fail; + } + + // For stores (which become SRS's, the only operand is the mode. + if (fieldFromInstruction32(Insn, 20, 1) == 0) { + Inst.addOperand( + MCOperand::CreateImm(fieldFromInstruction32(Insn, 0, 4))); + return S; + } + + return DecodeRFEInstruction(Inst, Insn, Address, Decoder); + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; // Tied + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeRegListOperand(Inst, reglist, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeCPSInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + unsigned imod = fieldFromInstruction32(Insn, 18, 2); + unsigned M = fieldFromInstruction32(Insn, 17, 1); + unsigned iflags = fieldFromInstruction32(Insn, 6, 3); + unsigned mode = fieldFromInstruction32(Insn, 0, 5); + + DecodeStatus S = MCDisassembler::Success; + + // imod == '01' --> UNPREDICTABLE + // NOTE: Even though this is technically UNPREDICTABLE, we choose to + // return failure here. The '01' imod value is unprintable, so there's + // nothing useful we could do even if we returned UNPREDICTABLE. + + if (imod == 1) return MCDisassembler::Fail; + + if (imod && M) { + Inst.setOpcode(ARM::CPS3p); + Inst.addOperand(MCOperand::CreateImm(imod)); + Inst.addOperand(MCOperand::CreateImm(iflags)); + Inst.addOperand(MCOperand::CreateImm(mode)); + } else if (imod && !M) { + Inst.setOpcode(ARM::CPS2p); + Inst.addOperand(MCOperand::CreateImm(imod)); + Inst.addOperand(MCOperand::CreateImm(iflags)); + if (mode) S = MCDisassembler::SoftFail; + } else if (!imod && M) { + Inst.setOpcode(ARM::CPS1p); + Inst.addOperand(MCOperand::CreateImm(mode)); + if (iflags) S = MCDisassembler::SoftFail; + } else { + // imod == '00' && M == '0' --> UNPREDICTABLE + Inst.setOpcode(ARM::CPS1p); + Inst.addOperand(MCOperand::CreateImm(mode)); + S = MCDisassembler::SoftFail; + } + + return S; +} + +static DecodeStatus DecodeT2CPSInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + unsigned imod = fieldFromInstruction32(Insn, 9, 2); + unsigned M = fieldFromInstruction32(Insn, 8, 1); + unsigned iflags = fieldFromInstruction32(Insn, 5, 3); + unsigned mode = fieldFromInstruction32(Insn, 0, 5); + + DecodeStatus S = MCDisassembler::Success; + + // imod == '01' --> UNPREDICTABLE + // NOTE: Even though this is technically UNPREDICTABLE, we choose to + // return failure here. The '01' imod value is unprintable, so there's + // nothing useful we could do even if we returned UNPREDICTABLE. + + if (imod == 1) return MCDisassembler::Fail; + + if (imod && M) { + Inst.setOpcode(ARM::t2CPS3p); + Inst.addOperand(MCOperand::CreateImm(imod)); + Inst.addOperand(MCOperand::CreateImm(iflags)); + Inst.addOperand(MCOperand::CreateImm(mode)); + } else if (imod && !M) { + Inst.setOpcode(ARM::t2CPS2p); + Inst.addOperand(MCOperand::CreateImm(imod)); + Inst.addOperand(MCOperand::CreateImm(iflags)); + if (mode) S = MCDisassembler::SoftFail; + } else if (!imod && M) { + Inst.setOpcode(ARM::t2CPS1p); + Inst.addOperand(MCOperand::CreateImm(mode)); + if (iflags) S = MCDisassembler::SoftFail; + } else { + // imod == '00' && M == '0' --> UNPREDICTABLE + Inst.setOpcode(ARM::t2CPS1p); + Inst.addOperand(MCOperand::CreateImm(mode)); + S = MCDisassembler::SoftFail; + } + + return S; +} + +static DecodeStatus DecodeT2MOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 8, 4); + unsigned imm = 0; + + imm |= (fieldFromInstruction32(Insn, 0, 8) << 0); + imm |= (fieldFromInstruction32(Insn, 12, 3) << 8); + imm |= (fieldFromInstruction32(Insn, 16, 4) << 12); + imm |= (fieldFromInstruction32(Insn, 26, 1) << 11); + + if (Inst.getOpcode() == ARM::t2MOVTi16) + if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + + if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) + Inst.addOperand(MCOperand::CreateImm(imm)); + + return S; +} + +static DecodeStatus DecodeArmMOVTWInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + unsigned imm = 0; + + imm |= (fieldFromInstruction32(Insn, 0, 12) << 0); + imm |= (fieldFromInstruction32(Insn, 16, 4) << 12); + + if (Inst.getOpcode() == ARM::MOVTi16) + if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + + if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder)) + Inst.addOperand(MCOperand::CreateImm(imm)); + + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeSMLAInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 16, 4); + unsigned Rn = fieldFromInstruction32(Insn, 0, 4); + unsigned Rm = fieldFromInstruction32(Insn, 8, 4); + unsigned Ra = fieldFromInstruction32(Insn, 12, 4); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + + if (pred == 0xF) + return DecodeCPSInstruction(Inst, Insn, Address, Decoder); + + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder))) + return MCDisassembler::Fail; + + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeAddrModeImm12Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned add = fieldFromInstruction32(Val, 12, 1); + unsigned imm = fieldFromInstruction32(Val, 0, 12); + unsigned Rn = fieldFromInstruction32(Val, 13, 4); + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + if (!add) imm *= -1; + if (imm == 0 && !add) imm = INT32_MIN; + Inst.addOperand(MCOperand::CreateImm(imm)); + if (Rn == 15) + tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder); + + return S; +} + +static DecodeStatus DecodeAddrMode5Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 9, 4); + unsigned U = fieldFromInstruction32(Val, 8, 1); + unsigned imm = fieldFromInstruction32(Val, 0, 8); + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + if (U) + Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add, imm))); + else + Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub, imm))); + + return S; +} + +static DecodeStatus DecodeAddrMode7Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + return DecodeGPRRegisterClass(Inst, Val, Address, Decoder); +} + +static DecodeStatus +DecodeBranchImmInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + unsigned imm = fieldFromInstruction32(Insn, 0, 24) << 2; + + if (pred == 0xF) { + Inst.setOpcode(ARM::BLXi); + imm |= fieldFromInstruction32(Insn, 24, 1) << 1; + Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); + return S; + } + + if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8, true, + 4, Inst, Decoder)) + Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm))); + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + + +static DecodeStatus DecodeVCVTImmOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(64 - Val)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeAddrMode6Operand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rm = fieldFromInstruction32(Val, 0, 4); + unsigned align = fieldFromInstruction32(Val, 4, 2); + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + if (!align) + Inst.addOperand(MCOperand::CreateImm(0)); + else + Inst.addOperand(MCOperand::CreateImm(4 << align)); + + return S; +} + +static DecodeStatus DecodeVLDInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned wb = fieldFromInstruction32(Insn, 16, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + Rn |= fieldFromInstruction32(Insn, 4, 2) << 4; + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + + // First output register + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + + // Second output register + switch (Inst.getOpcode()) { + case ARM::VLD1q8: + case ARM::VLD1q16: + case ARM::VLD1q32: + case ARM::VLD1q64: + case ARM::VLD1q8_UPD: + case ARM::VLD1q16_UPD: + case ARM::VLD1q32_UPD: + case ARM::VLD1q64_UPD: + case ARM::VLD1d8T: + case ARM::VLD1d16T: + case ARM::VLD1d32T: + case ARM::VLD1d64T: + case ARM::VLD1d8T_UPD: + case ARM::VLD1d16T_UPD: + case ARM::VLD1d32T_UPD: + case ARM::VLD1d64T_UPD: + case ARM::VLD1d8Q: + case ARM::VLD1d16Q: + case ARM::VLD1d32Q: + case ARM::VLD1d64Q: + case ARM::VLD1d8Q_UPD: + case ARM::VLD1d16Q_UPD: + case ARM::VLD1d32Q_UPD: + case ARM::VLD1d64Q_UPD: + case ARM::VLD2d8: + case ARM::VLD2d16: + case ARM::VLD2d32: + case ARM::VLD2d8_UPD: + case ARM::VLD2d16_UPD: + case ARM::VLD2d32_UPD: + case ARM::VLD2q8: + case ARM::VLD2q16: + case ARM::VLD2q32: + case ARM::VLD2q8_UPD: + case ARM::VLD2q16_UPD: + case ARM::VLD2q32_UPD: + case ARM::VLD3d8: + case ARM::VLD3d16: + case ARM::VLD3d32: + case ARM::VLD3d8_UPD: + case ARM::VLD3d16_UPD: + case ARM::VLD3d32_UPD: + case ARM::VLD4d8: + case ARM::VLD4d16: + case ARM::VLD4d32: + case ARM::VLD4d8_UPD: + case ARM::VLD4d16_UPD: + case ARM::VLD4d32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) + return MCDisassembler::Fail; break; + case ARM::VLD2b8: + case ARM::VLD2b16: + case ARM::VLD2b32: + case ARM::VLD2b8_UPD: + case ARM::VLD2b16_UPD: + case ARM::VLD2b32_UPD: + case ARM::VLD3q8: + case ARM::VLD3q16: + case ARM::VLD3q32: + case ARM::VLD3q8_UPD: + case ARM::VLD3q16_UPD: + case ARM::VLD3q32_UPD: + case ARM::VLD4q8: + case ARM::VLD4q16: + case ARM::VLD4q32: + case ARM::VLD4q8_UPD: + case ARM::VLD4q16_UPD: + case ARM::VLD4q32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) + return MCDisassembler::Fail; default: - break; // fallthrough + break; + } + + // Third output register + switch(Inst.getOpcode()) { + case ARM::VLD1d8T: + case ARM::VLD1d16T: + case ARM::VLD1d32T: + case ARM::VLD1d64T: + case ARM::VLD1d8T_UPD: + case ARM::VLD1d16T_UPD: + case ARM::VLD1d32T_UPD: + case ARM::VLD1d64T_UPD: + case ARM::VLD1d8Q: + case ARM::VLD1d16Q: + case ARM::VLD1d32Q: + case ARM::VLD1d64Q: + case ARM::VLD1d8Q_UPD: + case ARM::VLD1d16Q_UPD: + case ARM::VLD1d32Q_UPD: + case ARM::VLD1d64Q_UPD: + case ARM::VLD2q8: + case ARM::VLD2q16: + case ARM::VLD2q32: + case ARM::VLD2q8_UPD: + case ARM::VLD2q16_UPD: + case ARM::VLD2q32_UPD: + case ARM::VLD3d8: + case ARM::VLD3d16: + case ARM::VLD3d32: + case ARM::VLD3d8_UPD: + case ARM::VLD3d16_UPD: + case ARM::VLD3d32_UPD: + case ARM::VLD4d8: + case ARM::VLD4d16: + case ARM::VLD4d32: + case ARM::VLD4d8_UPD: + case ARM::VLD4d16_UPD: + case ARM::VLD4d32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + case ARM::VLD3q8: + case ARM::VLD3q16: + case ARM::VLD3q32: + case ARM::VLD3q8_UPD: + case ARM::VLD3q16_UPD: + case ARM::VLD3q32_UPD: + case ARM::VLD4q8: + case ARM::VLD4q16: + case ARM::VLD4q32: + case ARM::VLD4q8_UPD: + case ARM::VLD4q16_UPD: + case ARM::VLD4q32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + // Fourth output register + switch (Inst.getOpcode()) { + case ARM::VLD1d8Q: + case ARM::VLD1d16Q: + case ARM::VLD1d32Q: + case ARM::VLD1d64Q: + case ARM::VLD1d8Q_UPD: + case ARM::VLD1d16Q_UPD: + case ARM::VLD1d32Q_UPD: + case ARM::VLD1d64Q_UPD: + case ARM::VLD2q8: + case ARM::VLD2q16: + case ARM::VLD2q32: + case ARM::VLD2q8_UPD: + case ARM::VLD2q16_UPD: + case ARM::VLD2q32_UPD: + case ARM::VLD4d8: + case ARM::VLD4d16: + case ARM::VLD4d32: + case ARM::VLD4d8_UPD: + case ARM::VLD4d16_UPD: + case ARM::VLD4d32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + case ARM::VLD4q8: + case ARM::VLD4q16: + case ARM::VLD4q32: + case ARM::VLD4q8_UPD: + case ARM::VLD4q16_UPD: + case ARM::VLD4q32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + // Writeback operand + switch (Inst.getOpcode()) { + case ARM::VLD1d8_UPD: + case ARM::VLD1d16_UPD: + case ARM::VLD1d32_UPD: + case ARM::VLD1d64_UPD: + case ARM::VLD1q8_UPD: + case ARM::VLD1q16_UPD: + case ARM::VLD1q32_UPD: + case ARM::VLD1q64_UPD: + case ARM::VLD1d8T_UPD: + case ARM::VLD1d16T_UPD: + case ARM::VLD1d32T_UPD: + case ARM::VLD1d64T_UPD: + case ARM::VLD1d8Q_UPD: + case ARM::VLD1d16Q_UPD: + case ARM::VLD1d32Q_UPD: + case ARM::VLD1d64Q_UPD: + case ARM::VLD2d8_UPD: + case ARM::VLD2d16_UPD: + case ARM::VLD2d32_UPD: + case ARM::VLD2q8_UPD: + case ARM::VLD2q16_UPD: + case ARM::VLD2q32_UPD: + case ARM::VLD2b8_UPD: + case ARM::VLD2b16_UPD: + case ARM::VLD2b32_UPD: + case ARM::VLD3d8_UPD: + case ARM::VLD3d16_UPD: + case ARM::VLD3d32_UPD: + case ARM::VLD3q8_UPD: + case ARM::VLD3q16_UPD: + case ARM::VLD3q32_UPD: + case ARM::VLD4d8_UPD: + case ARM::VLD4d16_UPD: + case ARM::VLD4d32_UPD: + case ARM::VLD4q8_UPD: + case ARM::VLD4q16_UPD: + case ARM::VLD4q32_UPD: + if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + // AddrMode6 Base (register+alignment) + if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + // AddrMode6 Offset (register) + if (Rm == 0xD) + Inst.addOperand(MCOperand::CreateReg(0)); + else if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; +} + +static DecodeStatus DecodeVSTInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned wb = fieldFromInstruction32(Insn, 16, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + Rn |= fieldFromInstruction32(Insn, 4, 2) << 4; + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + + // Writeback Operand + switch (Inst.getOpcode()) { + case ARM::VST1d8_UPD: + case ARM::VST1d16_UPD: + case ARM::VST1d32_UPD: + case ARM::VST1d64_UPD: + case ARM::VST1q8_UPD: + case ARM::VST1q16_UPD: + case ARM::VST1q32_UPD: + case ARM::VST1q64_UPD: + case ARM::VST1d8T_UPD: + case ARM::VST1d16T_UPD: + case ARM::VST1d32T_UPD: + case ARM::VST1d64T_UPD: + case ARM::VST1d8Q_UPD: + case ARM::VST1d16Q_UPD: + case ARM::VST1d32Q_UPD: + case ARM::VST1d64Q_UPD: + case ARM::VST2d8_UPD: + case ARM::VST2d16_UPD: + case ARM::VST2d32_UPD: + case ARM::VST2q8_UPD: + case ARM::VST2q16_UPD: + case ARM::VST2q32_UPD: + case ARM::VST2b8_UPD: + case ARM::VST2b16_UPD: + case ARM::VST2b32_UPD: + case ARM::VST3d8_UPD: + case ARM::VST3d16_UPD: + case ARM::VST3d32_UPD: + case ARM::VST3q8_UPD: + case ARM::VST3q16_UPD: + case ARM::VST3q32_UPD: + case ARM::VST4d8_UPD: + case ARM::VST4d16_UPD: + case ARM::VST4d32_UPD: + case ARM::VST4q8_UPD: + case ARM::VST4q16_UPD: + case ARM::VST4q32_UPD: + if (!Check(S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + // AddrMode6 Base (register+alignment) + if (!Check(S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + // AddrMode6 Offset (register) + if (Rm == 0xD) + Inst.addOperand(MCOperand::CreateReg(0)); + else if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } + + // First input register + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + + // Second input register + switch (Inst.getOpcode()) { + case ARM::VST1q8: + case ARM::VST1q16: + case ARM::VST1q32: + case ARM::VST1q64: + case ARM::VST1q8_UPD: + case ARM::VST1q16_UPD: + case ARM::VST1q32_UPD: + case ARM::VST1q64_UPD: + case ARM::VST1d8T: + case ARM::VST1d16T: + case ARM::VST1d32T: + case ARM::VST1d64T: + case ARM::VST1d8T_UPD: + case ARM::VST1d16T_UPD: + case ARM::VST1d32T_UPD: + case ARM::VST1d64T_UPD: + case ARM::VST1d8Q: + case ARM::VST1d16Q: + case ARM::VST1d32Q: + case ARM::VST1d64Q: + case ARM::VST1d8Q_UPD: + case ARM::VST1d16Q_UPD: + case ARM::VST1d32Q_UPD: + case ARM::VST1d64Q_UPD: + case ARM::VST2d8: + case ARM::VST2d16: + case ARM::VST2d32: + case ARM::VST2d8_UPD: + case ARM::VST2d16_UPD: + case ARM::VST2d32_UPD: + case ARM::VST2q8: + case ARM::VST2q16: + case ARM::VST2q32: + case ARM::VST2q8_UPD: + case ARM::VST2q16_UPD: + case ARM::VST2q32_UPD: + case ARM::VST3d8: + case ARM::VST3d16: + case ARM::VST3d32: + case ARM::VST3d8_UPD: + case ARM::VST3d16_UPD: + case ARM::VST3d32_UPD: + case ARM::VST4d8: + case ARM::VST4d16: + case ARM::VST4d32: + case ARM::VST4d8_UPD: + case ARM::VST4d16_UPD: + case ARM::VST4d32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + case ARM::VST2b8: + case ARM::VST2b16: + case ARM::VST2b32: + case ARM::VST2b8_UPD: + case ARM::VST2b16_UPD: + case ARM::VST2b32_UPD: + case ARM::VST3q8: + case ARM::VST3q16: + case ARM::VST3q32: + case ARM::VST3q8_UPD: + case ARM::VST3q16_UPD: + case ARM::VST3q32_UPD: + case ARM::VST4q8: + case ARM::VST4q16: + case ARM::VST4q32: + case ARM::VST4q8_UPD: + case ARM::VST4q16_UPD: + case ARM::VST4q32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + // Third input register + switch (Inst.getOpcode()) { + case ARM::VST1d8T: + case ARM::VST1d16T: + case ARM::VST1d32T: + case ARM::VST1d64T: + case ARM::VST1d8T_UPD: + case ARM::VST1d16T_UPD: + case ARM::VST1d32T_UPD: + case ARM::VST1d64T_UPD: + case ARM::VST1d8Q: + case ARM::VST1d16Q: + case ARM::VST1d32Q: + case ARM::VST1d64Q: + case ARM::VST1d8Q_UPD: + case ARM::VST1d16Q_UPD: + case ARM::VST1d32Q_UPD: + case ARM::VST1d64Q_UPD: + case ARM::VST2q8: + case ARM::VST2q16: + case ARM::VST2q32: + case ARM::VST2q8_UPD: + case ARM::VST2q16_UPD: + case ARM::VST2q32_UPD: + case ARM::VST3d8: + case ARM::VST3d16: + case ARM::VST3d32: + case ARM::VST3d8_UPD: + case ARM::VST3d16_UPD: + case ARM::VST3d32_UPD: + case ARM::VST4d8: + case ARM::VST4d16: + case ARM::VST4d32: + case ARM::VST4d8_UPD: + case ARM::VST4d16_UPD: + case ARM::VST4d32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + case ARM::VST3q8: + case ARM::VST3q16: + case ARM::VST3q32: + case ARM::VST3q8_UPD: + case ARM::VST3q16_UPD: + case ARM::VST3q32_UPD: + case ARM::VST4q8: + case ARM::VST4q16: + case ARM::VST4q32: + case ARM::VST4q8_UPD: + case ARM::VST4q16_UPD: + case ARM::VST4q32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + // Fourth input register + switch (Inst.getOpcode()) { + case ARM::VST1d8Q: + case ARM::VST1d16Q: + case ARM::VST1d32Q: + case ARM::VST1d64Q: + case ARM::VST1d8Q_UPD: + case ARM::VST1d16Q_UPD: + case ARM::VST1d32Q_UPD: + case ARM::VST1d64Q_UPD: + case ARM::VST2q8: + case ARM::VST2q16: + case ARM::VST2q32: + case ARM::VST2q8_UPD: + case ARM::VST2q16_UPD: + case ARM::VST2q32_UPD: + case ARM::VST4d8: + case ARM::VST4d16: + case ARM::VST4d32: + case ARM::VST4d8_UPD: + case ARM::VST4d16_UPD: + case ARM::VST4d32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + case ARM::VST4q8: + case ARM::VST4q16: + case ARM::VST4q32: + case ARM::VST4q8_UPD: + case ARM::VST4q16_UPD: + case ARM::VST4q32_UPD: + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + return S; +} + +static DecodeStatus DecodeVLD1DupInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned align = fieldFromInstruction32(Insn, 4, 1); + unsigned size = fieldFromInstruction32(Insn, 6, 2); + unsigned regs = fieldFromInstruction32(Insn, 5, 1) + 1; + + align *= (1 << size); + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (regs == 2) { + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) + return MCDisassembler::Fail; + } + if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + + if (Rm == 0xD) + Inst.addOperand(MCOperand::CreateReg(0)); + else if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; +} + +static DecodeStatus DecodeVLD2DupInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned align = fieldFromInstruction32(Insn, 4, 1); + unsigned size = 1 << fieldFromInstruction32(Insn, 6, 2); + unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; + align *= 2*size; + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) + return MCDisassembler::Fail; + if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + + if (Rm == 0xD) + Inst.addOperand(MCOperand::CreateReg(0)); + else if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; +} + +static DecodeStatus DecodeVLD3DupInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) + return MCDisassembler::Fail; + if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(0)); + + if (Rm == 0xD) + Inst.addOperand(MCOperand::CreateReg(0)); + else if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; +} + +static DecodeStatus DecodeVLD4DupInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned size = fieldFromInstruction32(Insn, 6, 2); + unsigned inc = fieldFromInstruction32(Insn, 5, 1) + 1; + unsigned align = fieldFromInstruction32(Insn, 4, 1); + + if (size == 0x3) { + size = 4; + align = 16; + } else { + if (size == 2) { + size = 1 << size; + align *= 8; + } else { + size = 1 << size; + align *= 4*size; } } -AutoGenedDecoder: - // Calling the auto-generated decoder function. - return decodeInstruction(insn); + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder))) + return MCDisassembler::Fail; + if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + + if (Rm == 0xD) + Inst.addOperand(MCOperand::CreateReg(0)); + else if (Rm != 0xF) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; } -// Helper function for special case handling of LDR (literal) and friends. -// See, for example, A6.3.7 Load word: Table A6-18 Load word. -// See A8.6.57 T3, T4 & A8.6.60 T2 and friends for why we morphed the opcode -// before returning it. -static unsigned T2Morph2LoadLiteral(unsigned Opcode) { - switch (Opcode) { - default: - return Opcode; // Return unmorphed opcode. +static DecodeStatus +DecodeNEONModImmInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned imm = fieldFromInstruction32(Insn, 0, 4); + imm |= fieldFromInstruction32(Insn, 16, 3) << 4; + imm |= fieldFromInstruction32(Insn, 24, 1) << 7; + imm |= fieldFromInstruction32(Insn, 8, 4) << 8; + imm |= fieldFromInstruction32(Insn, 5, 1) << 12; + unsigned Q = fieldFromInstruction32(Insn, 6, 1); + + if (Q) { + if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + } else { + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + } + + Inst.addOperand(MCOperand::CreateImm(imm)); + + switch (Inst.getOpcode()) { + case ARM::VORRiv4i16: + case ARM::VORRiv2i32: + case ARM::VBICiv4i16: + case ARM::VBICiv2i32: + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + break; + case ARM::VORRiv8i16: + case ARM::VORRiv4i32: + case ARM::VBICiv8i16: + case ARM::VBICiv4i32: + if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + break; + default: + break; + } + + return S; +} + +static DecodeStatus DecodeVSHLMaxInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 18, 2); + + if (!Check(S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(8 << size)); + + return S; +} + +static DecodeStatus DecodeShiftRight8Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(8 - Val)); + return MCDisassembler::Success; +} - case ARM::t2LDR_POST: case ARM::t2LDR_PRE: - case ARM::t2LDRi12: case ARM::t2LDRi8: - case ARM::t2LDRs: case ARM::t2LDRT: - return ARM::t2LDRpci; +static DecodeStatus DecodeShiftRight16Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(16 - Val)); + return MCDisassembler::Success; +} - case ARM::t2LDRB_POST: case ARM::t2LDRB_PRE: - case ARM::t2LDRBi12: case ARM::t2LDRBi8: - case ARM::t2LDRBs: case ARM::t2LDRBT: - return ARM::t2LDRBpci; +static DecodeStatus DecodeShiftRight32Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(32 - Val)); + return MCDisassembler::Success; +} - case ARM::t2LDRH_POST: case ARM::t2LDRH_PRE: - case ARM::t2LDRHi12: case ARM::t2LDRHi8: - case ARM::t2LDRHs: case ARM::t2LDRHT: - return ARM::t2LDRHpci; +static DecodeStatus DecodeShiftRight64Imm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(64 - Val)); + return MCDisassembler::Success; +} - case ARM::t2LDRSB_POST: case ARM::t2LDRSB_PRE: - case ARM::t2LDRSBi12: case ARM::t2LDRSBi8: - case ARM::t2LDRSBs: case ARM::t2LDRSBT: - return ARM::t2LDRSBpci; +static DecodeStatus DecodeTBLInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + Rn |= fieldFromInstruction32(Insn, 7, 1) << 4; + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; + unsigned op = fieldFromInstruction32(Insn, 6, 1); + unsigned length = fieldFromInstruction32(Insn, 8, 2) + 1; + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (op) { + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; // Writeback + } - case ARM::t2LDRSH_POST: case ARM::t2LDRSH_PRE: - case ARM::t2LDRSHi12: case ARM::t2LDRSHi8: - case ARM::t2LDRSHs: case ARM::t2LDRSHT: - return ARM::t2LDRSHpci; + for (unsigned i = 0; i < length; ++i) { + if (!Check(S, DecodeDPRRegisterClass(Inst, (Rn+i)%32, Address, Decoder))) + return MCDisassembler::Fail; } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + + return S; } -// Helper function for special case handling of PLD (literal) and friends. -// See A8.6.117 T1 & T2 and friends for why we morphed the opcode -// before returning it. -static unsigned T2Morph2PLDLiteral(unsigned Opcode) { - switch (Opcode) { - default: - return Opcode; // Return unmorphed opcode. - - case ARM::t2PLDi8: case ARM::t2PLDs: - case ARM::t2PLDWi12: case ARM::t2PLDWi8: - case ARM::t2PLDWs: - return ARM::t2PLDi12; - - case ARM::t2PLIi8: case ARM::t2PLIs: - return ARM::t2PLIi12; - } -} - -/// decodeThumbSideEffect is a decorator function which can potentially twiddle -/// the instruction or morph the returned opcode under Thumb2. -/// -/// First it checks whether the insn is a NEON or VFP instr; if true, bit -/// twiddling could be performed on insn to turn it into an ARM NEON/VFP -/// equivalent instruction and decodeInstruction is called with the transformed -/// insn. -/// -/// Next, there is special handling for Load byte/halfword/word instruction by -/// checking whether Rn=0b1111 and call T2Morph2LoadLiteral() on the decoded -/// Thumb2 instruction. See comments below for further details. -/// -/// Finally, one last check is made to see whether the insn is a NEON/VFP and -/// decodeInstruction(insn) is invoked on the original insn. -/// -/// Otherwise, decodeThumbInstruction is called with the original insn. -static unsigned decodeThumbSideEffect(bool IsThumb2, unsigned &insn) { - if (IsThumb2) { - uint16_t op1 = slice(insn, 28, 27); - uint16_t op2 = slice(insn, 26, 20); - - // A6.3 32-bit Thumb instruction encoding - // Table A6-9 32-bit Thumb instruction encoding - - // The coprocessor instructions of interest are transformed to their ARM - // equivalents. - - // --------- Transform Begin Marker --------- - if ((op1 == 1 || op1 == 3) && slice(op2, 6, 4) == 7) { - // A7.4 Advanced SIMD data-processing instructions - // U bit of Thumb corresponds to Inst{24} of ARM. - uint16_t U = slice(op1, 1, 1); - - // Inst{28-24} of ARM = {1,0,0,1,U}; - uint16_t bits28_24 = 9 << 1 | U; - DEBUG(showBitVector(errs(), insn)); - setSlice(insn, 28, 24, bits28_24); - return decodeInstruction(insn); +static DecodeStatus DecodeThumbAddSpecialReg(llvm::MCInst &Inst, uint16_t Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned dst = fieldFromInstruction16(Insn, 8, 3); + unsigned imm = fieldFromInstruction16(Insn, 0, 8); + + if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder))) + return MCDisassembler::Fail; + + switch(Inst.getOpcode()) { + default: + return MCDisassembler::Fail; + case ARM::tADR: + break; // tADR does not explicitly represent the PC as an operand. + case ARM::tADDrSPi: + Inst.addOperand(MCOperand::CreateReg(ARM::SP)); + break; + } + + Inst.addOperand(MCOperand::CreateImm(imm)); + return S; +} + +static DecodeStatus DecodeThumbBROperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(SignExtend32<12>(Val << 1))); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeT2BROperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(SignExtend32<21>(Val))); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeThumbCmpBROperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateImm(SignExtend32<7>(Val << 1))); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeThumbAddrModeRR(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 0, 3); + unsigned Rm = fieldFromInstruction32(Val, 3, 3); + + if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeThumbAddrModeIS(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 0, 3); + unsigned imm = fieldFromInstruction32(Val, 3, 5); + + if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(imm)); + + return S; +} + +static DecodeStatus DecodeThumbAddrModePC(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + unsigned imm = Val << 2; + + Inst.addOperand(MCOperand::CreateImm(imm)); + tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeThumbAddrModeSP(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + Inst.addOperand(MCOperand::CreateReg(ARM::SP)); + Inst.addOperand(MCOperand::CreateImm(Val)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeT2AddrModeSOReg(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 6, 4); + unsigned Rm = fieldFromInstruction32(Val, 2, 4); + unsigned imm = fieldFromInstruction32(Val, 0, 2); + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(imm)); + + return S; +} + +static DecodeStatus DecodeT2LoadShift(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + switch (Inst.getOpcode()) { + case ARM::t2PLDs: + case ARM::t2PLDWs: + case ARM::t2PLIs: + break; + default: { + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; } + } - if (op1 == 3 && slice(op2, 6, 4) == 1 && slice(op2, 0, 0) == 0) { - // A7.7 Advanced SIMD element or structure load/store instructions - // Inst{27-24} of Thumb = 0b1001 - // Inst{27-24} of ARM = 0b0100 - DEBUG(showBitVector(errs(), insn)); - setSlice(insn, 27, 24, 4); - return decodeInstruction(insn); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + if (Rn == 0xF) { + switch (Inst.getOpcode()) { + case ARM::t2LDRBs: + Inst.setOpcode(ARM::t2LDRBpci); + break; + case ARM::t2LDRHs: + Inst.setOpcode(ARM::t2LDRHpci); + break; + case ARM::t2LDRSHs: + Inst.setOpcode(ARM::t2LDRSHpci); + break; + case ARM::t2LDRSBs: + Inst.setOpcode(ARM::t2LDRSBpci); + break; + case ARM::t2PLDs: + Inst.setOpcode(ARM::t2PLDi12); + Inst.addOperand(MCOperand::CreateReg(ARM::PC)); + break; + default: + return MCDisassembler::Fail; } - // --------- Transform End Marker --------- - - unsigned unmorphed = decodeThumbInstruction(insn); - - // See, for example, A6.3.7 Load word: Table A6-18 Load word. - // See A8.6.57 T3, T4 & A8.6.60 T2 and friends for why we morphed the opcode - // before returning it to our caller. - if (op1 == 3 && slice(op2, 6, 5) == 0 && slice(op2, 0, 0) == 1 - && slice(insn, 19, 16) == 15) { - unsigned morphed = T2Morph2LoadLiteral(unmorphed); - if (morphed != unmorphed) - return morphed; + + int imm = fieldFromInstruction32(Insn, 0, 12); + if (!fieldFromInstruction32(Insn, 23, 1)) imm *= -1; + Inst.addOperand(MCOperand::CreateImm(imm)); + + return S; + } + + unsigned addrmode = fieldFromInstruction32(Insn, 4, 2); + addrmode |= fieldFromInstruction32(Insn, 0, 4) << 2; + addrmode |= fieldFromInstruction32(Insn, 16, 4) << 6; + if (!Check(S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeT2Imm8S4(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + int imm = Val & 0xFF; + if (!(Val & 0x100)) imm *= -1; + Inst.addOperand(MCOperand::CreateImm(imm << 2)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeT2AddrModeImm8s4(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 9, 4); + unsigned imm = fieldFromInstruction32(Val, 0, 9); + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeT2Imm8S4(Inst, imm, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeT2AddrModeImm0_1020s4(llvm::MCInst &Inst,unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 8, 4); + unsigned imm = fieldFromInstruction32(Val, 0, 8); + + if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + + Inst.addOperand(MCOperand::CreateImm(imm)); + + return S; +} + +static DecodeStatus DecodeT2Imm8(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + int imm = Val & 0xFF; + if (Val == 0) + imm = INT32_MIN; + else if (!(Val & 0x100)) + imm *= -1; + Inst.addOperand(MCOperand::CreateImm(imm)); + + return MCDisassembler::Success; +} + + +static DecodeStatus DecodeT2AddrModeImm8(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 9, 4); + unsigned imm = fieldFromInstruction32(Val, 0, 9); + + // Some instructions always use an additive offset. + switch (Inst.getOpcode()) { + case ARM::t2LDRT: + case ARM::t2LDRBT: + case ARM::t2LDRHT: + case ARM::t2LDRSBT: + case ARM::t2LDRSHT: + case ARM::t2STRT: + case ARM::t2STRBT: + case ARM::t2STRHT: + imm |= 0x100; + break; + default: + break; + } + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeT2Imm8(Inst, imm, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeT2LdStPre(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned addr = fieldFromInstruction32(Insn, 0, 8); + addr |= fieldFromInstruction32(Insn, 9, 1) << 8; + addr |= Rn << 9; + unsigned load = fieldFromInstruction32(Insn, 20, 1); + + if (!load) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + + if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + + if (load) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + + if (!Check(S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeT2AddrModeImm12(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Val, 13, 4); + unsigned imm = fieldFromInstruction32(Val, 0, 12); + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(imm)); + + return S; +} + + +static DecodeStatus DecodeThumbAddSPImm(llvm::MCInst &Inst, uint16_t Insn, + uint64_t Address, const void *Decoder) { + unsigned imm = fieldFromInstruction16(Insn, 0, 7); + + Inst.addOperand(MCOperand::CreateReg(ARM::SP)); + Inst.addOperand(MCOperand::CreateReg(ARM::SP)); + Inst.addOperand(MCOperand::CreateImm(imm)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeThumbAddSPReg(llvm::MCInst &Inst, uint16_t Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + if (Inst.getOpcode() == ARM::tADDrSP) { + unsigned Rdm = fieldFromInstruction16(Insn, 0, 3); + Rdm |= fieldFromInstruction16(Insn, 7, 1) << 3; + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateReg(ARM::SP)); + } else if (Inst.getOpcode() == ARM::tADDspr) { + unsigned Rm = fieldFromInstruction16(Insn, 3, 4); + + Inst.addOperand(MCOperand::CreateReg(ARM::SP)); + Inst.addOperand(MCOperand::CreateReg(ARM::SP)); + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } + + return S; +} + +static DecodeStatus DecodeThumbCPS(llvm::MCInst &Inst, uint16_t Insn, + uint64_t Address, const void *Decoder) { + unsigned imod = fieldFromInstruction16(Insn, 4, 1) | 0x2; + unsigned flags = fieldFromInstruction16(Insn, 0, 3); + + Inst.addOperand(MCOperand::CreateImm(imod)); + Inst.addOperand(MCOperand::CreateImm(flags)); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodePostIdxReg(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned add = fieldFromInstruction32(Insn, 4, 1); + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(add)); + + return S; +} + +static DecodeStatus DecodeThumbBLXOffset(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + if (!tryAddingSymbolicOperand(Address, + (Address & ~2u) + SignExtend32<22>(Val << 1) + 4, + true, 4, Inst, Decoder)) + Inst.addOperand(MCOperand::CreateImm(SignExtend32<22>(Val << 1))); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCoprocessor(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + if (Val == 0xA || Val == 0xB) + return MCDisassembler::Fail; + + Inst.addOperand(MCOperand::CreateImm(Val)); + return MCDisassembler::Success; +} + +static DecodeStatus +DecodeThumbTableBranch(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + + if (Rn == ARM::SP) S = MCDisassembler::SoftFail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + return S; +} + +static DecodeStatus +DecodeThumb2BCCInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned pred = fieldFromInstruction32(Insn, 22, 4); + if (pred == 0xE || pred == 0xF) { + unsigned opc = fieldFromInstruction32(Insn, 4, 28); + switch (opc) { + default: + return MCDisassembler::Fail; + case 0xf3bf8f4: + Inst.setOpcode(ARM::t2DSB); + break; + case 0xf3bf8f5: + Inst.setOpcode(ARM::t2DMB); + break; + case 0xf3bf8f6: + Inst.setOpcode(ARM::t2ISB); + break; } - // See, for example, A8.6.117 PLD,PLDW (immediate) T1 & T2, and friends for - // why we morphed the opcode before returning it to our caller. - if (slice(insn, 31, 25) == 0x7C && slice(insn, 15, 12) == 0xF - && slice(insn, 22, 22) == 0 && slice(insn, 20, 20) == 1 - && slice(insn, 19, 16) == 15) { - unsigned morphed = T2Morph2PLDLiteral(unmorphed); - if (morphed != unmorphed) - return morphed; + unsigned imm = fieldFromInstruction32(Insn, 0, 4); + return DecodeMemBarrierOption(Inst, imm, Address, Decoder); + } + + unsigned brtarget = fieldFromInstruction32(Insn, 0, 11) << 1; + brtarget |= fieldFromInstruction32(Insn, 11, 1) << 19; + brtarget |= fieldFromInstruction32(Insn, 13, 1) << 18; + brtarget |= fieldFromInstruction32(Insn, 16, 6) << 12; + brtarget |= fieldFromInstruction32(Insn, 26, 1) << 20; + + if (!Check(S, DecodeT2BROperand(Inst, brtarget, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +// Decode a shifted immediate operand. These basically consist +// of an 8-bit value, and a 4-bit directive that specifies either +// a splat operation or a rotation. +static DecodeStatus DecodeT2SOImm(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + unsigned ctrl = fieldFromInstruction32(Val, 10, 2); + if (ctrl == 0) { + unsigned byte = fieldFromInstruction32(Val, 8, 2); + unsigned imm = fieldFromInstruction32(Val, 0, 8); + switch (byte) { + case 0: + Inst.addOperand(MCOperand::CreateImm(imm)); + break; + case 1: + Inst.addOperand(MCOperand::CreateImm((imm << 16) | imm)); + break; + case 2: + Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 8))); + break; + case 3: + Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 16) | + (imm << 8) | imm)); + break; } + } else { + unsigned unrot = fieldFromInstruction32(Val, 0, 7) | 0x80; + unsigned rot = fieldFromInstruction32(Val, 7, 5); + unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31)); + Inst.addOperand(MCOperand::CreateImm(imm)); + } - // One last check for NEON/VFP instructions. - if ((op1 == 1 || op1 == 3) && slice(op2, 6, 6) == 1) - return decodeInstruction(insn); + return MCDisassembler::Success; +} + +static DecodeStatus +DecodeThumbBCCTargetOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder){ + Inst.addOperand(MCOperand::CreateImm(Val << 1)); + return MCDisassembler::Success; +} - // Fall through. +static DecodeStatus DecodeThumbBLTargetOperand(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder){ + Inst.addOperand(MCOperand::CreateImm(SignExtend32<22>(Val << 1))); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeMemBarrierOption(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + switch (Val) { + default: + return MCDisassembler::Fail; + case 0xF: // SY + case 0xE: // ST + case 0xB: // ISH + case 0xA: // ISHST + case 0x7: // NSH + case 0x6: // NSHST + case 0x3: // OSH + case 0x2: // OSHST + break; } - return decodeThumbInstruction(insn); + Inst.addOperand(MCOperand::CreateImm(Val)); + return MCDisassembler::Success; } -// -// Public interface for the disassembler -// +static DecodeStatus DecodeMSRMask(llvm::MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + if (!Val) return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(Val)); + return MCDisassembler::Success; +} -bool ARMDisassembler::getInstruction(MCInst &MI, - uint64_t &Size, - const MemoryObject &Region, - uint64_t Address, - raw_ostream &os) const { - // The machine instruction. - uint32_t insn; - uint8_t bytes[4]; +static DecodeStatus DecodeDoubleRegLoad(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; - // We want to read exactly 4 bytes of data. - if (Region.readBytes(Address, 4, (uint8_t*)bytes, NULL) == -1) - return false; + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); - // Encoded as a small-endian 32-bit word in the stream. - insn = (bytes[3] << 24) | - (bytes[2] << 16) | - (bytes[1] << 8) | - (bytes[0] << 0); - - unsigned Opcode = decodeARMInstruction(insn); - ARMFormat Format = ARMFormats[Opcode]; - Size = 4; - - DEBUG({ - errs() << "\nOpcode=" << Opcode << " Name=" <<ARMUtils::OpcodeName(Opcode) - << " Format=" << stringForARMFormat(Format) << '(' << (int)Format - << ")\n"; - showBitVector(errs(), insn); - }); - - OwningPtr<ARMBasicMCBuilder> Builder(CreateMCBuilder(Opcode, Format)); - if (!Builder) - return false; + if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; - Builder->setupBuilderForSymbolicDisassembly(getLLVMOpInfoCallback(), - getDisInfoBlock(), getMCContext(), - Address); + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; - if (!Builder->Build(MI, insn)) - return false; + return S; +} - return true; + +static DecodeStatus DecodeDoubleRegStore(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder){ + DecodeStatus S = MCDisassembler::Success; + + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + unsigned Rt = fieldFromInstruction32(Insn, 0, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + + if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + + if ((Rt & 1) || Rt == 0xE || Rn == 0xF) return MCDisassembler::Fail; + if (Rd == Rn || Rd == Rt || Rd == Rt+1) return MCDisassembler::Fail; + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; } -bool ThumbDisassembler::getInstruction(MCInst &MI, - uint64_t &Size, - const MemoryObject &Region, - uint64_t Address, - raw_ostream &os) const { - // The Thumb instruction stream is a sequence of halfwords. - - // This represents the first halfword as well as the machine instruction - // passed to decodeThumbInstruction(). For 16-bit Thumb instruction, the top - // halfword of insn is 0x00 0x00; otherwise, the first halfword is moved to - // the top half followed by the second halfword. - unsigned insn = 0; - // Possible second halfword. - uint16_t insn1 = 0; - - // A6.1 Thumb instruction set encoding - // - // If bits [15:11] of the halfword being decoded take any of the following - // values, the halfword is the first halfword of a 32-bit instruction: - // o 0b11101 - // o 0b11110 - // o 0b11111. - // - // Otherwise, the halfword is a 16-bit instruction. - - // Read 2 bytes of data first. - uint8_t bytes[2]; - if (Region.readBytes(Address, 2, (uint8_t*)bytes, NULL) == -1) - return false; +static DecodeStatus DecodeLDRPreImm(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned imm = fieldFromInstruction32(Insn, 0, 12); + imm |= fieldFromInstruction32(Insn, 16, 4) << 13; + imm |= fieldFromInstruction32(Insn, 23, 1) << 12; + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + + if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} - // Encoded as a small-endian 16-bit halfword in the stream. - insn = (bytes[1] << 8) | bytes[0]; - unsigned bits15_11 = slice(insn, 15, 11); - bool IsThumb2 = false; +static DecodeStatus DecodeLDRPreReg(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned imm = fieldFromInstruction32(Insn, 0, 12); + imm |= fieldFromInstruction32(Insn, 16, 4) << 13; + imm |= fieldFromInstruction32(Insn, 23, 1) << 12; + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + + if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; + if (Rm == 0xF) S = MCDisassembler::SoftFail; + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} - // 32-bit instructions if the bits [15:11] of the halfword matches - // { 0b11101 /* 0x1D */, 0b11110 /* 0x1E */, ob11111 /* 0x1F */ }. - if (bits15_11 == 0x1D || bits15_11 == 0x1E || bits15_11 == 0x1F) { - IsThumb2 = true; - if (Region.readBytes(Address + 2, 2, (uint8_t*)bytes, NULL) == -1) - return false; - // Encoded as a small-endian 16-bit halfword in the stream. - insn1 = (bytes[1] << 8) | bytes[0]; - insn = (insn << 16 | insn1); - } - - // The insn could potentially be bit-twiddled in order to be decoded as an ARM - // NEON/VFP opcode. In such case, the modified insn is later disassembled as - // an ARM NEON/VFP instruction. - // - // This is a short term solution for lack of encoding bits specified for the - // Thumb2 NEON/VFP instructions. The long term solution could be adding some - // infrastructure to have each instruction support more than one encodings. - // Which encoding is used would be based on which subtarget the compiler/ - // disassembler is working with at the time. This would allow the sharing of - // the NEON patterns between ARM and Thumb2, as well as potential greater - // sharing between the regular ARM instructions and the 32-bit wide Thumb2 - // instructions as well. - unsigned Opcode = decodeThumbSideEffect(IsThumb2, insn); - - ARMFormat Format = ARMFormats[Opcode]; - Size = IsThumb2 ? 4 : 2; - - DEBUG({ - errs() << "Opcode=" << Opcode << " Name=" << ARMUtils::OpcodeName(Opcode) - << " Format=" << stringForARMFormat(Format) << '(' << (int)Format - << ")\n"; - showBitVector(errs(), insn); - }); - - OwningPtr<ARMBasicMCBuilder> Builder(CreateMCBuilder(Opcode, Format)); - if (!Builder) - return false; - Builder->SetSession(const_cast<Session *>(&SO)); +static DecodeStatus DecodeSTRPreImm(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; - Builder->setupBuilderForSymbolicDisassembly(getLLVMOpInfoCallback(), - getDisInfoBlock(), getMCContext(), - Address); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned imm = fieldFromInstruction32(Insn, 0, 12); + imm |= fieldFromInstruction32(Insn, 16, 4) << 13; + imm |= fieldFromInstruction32(Insn, 23, 1) << 12; + unsigned pred = fieldFromInstruction32(Insn, 28, 4); - if (!Builder->Build(MI, insn)) - return false; + if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; - return true; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; } -// A8.6.50 -// Valid return values are {1, 2, 3, 4}, with 0 signifying an error condition. -static unsigned short CountITSize(unsigned ITMask) { - // First count the trailing zeros of the IT mask. - unsigned TZ = CountTrailingZeros_32(ITMask); - if (TZ > 3) { - DEBUG(errs() << "Encoding error: IT Mask '0000'"); - return 0; +static DecodeStatus DecodeSTRPreReg(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned imm = fieldFromInstruction32(Insn, 0, 12); + imm |= fieldFromInstruction32(Insn, 16, 4) << 13; + imm |= fieldFromInstruction32(Insn, 23, 1) << 12; + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + + if (Rn == 0xF || Rn == Rt) S = MCDisassembler::SoftFail; + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeVLD1LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + if (fieldFromInstruction32(Insn, 4, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 5, 3); + break; + case 1: + if (fieldFromInstruction32(Insn, 5, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 4, 1)) + align = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 6, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 4, 2) != 0) + align = 4; + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); } - return (4 - TZ); + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); + + return S; } -/// Init ITState. Note that at least one bit is always 1 in mask. -bool Session::InitIT(unsigned short bits7_0) { - ITCounter = CountITSize(slice(bits7_0, 3, 0)); - if (ITCounter == 0) - return false; +static DecodeStatus DecodeVST1LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; - // A8.6.50 IT - unsigned short FirstCond = slice(bits7_0, 7, 4); - if (FirstCond == 0xF) { - DEBUG(errs() << "Encoding error: IT FirstCond '1111'"); - return false; + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + if (fieldFromInstruction32(Insn, 4, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 5, 3); + break; + case 1: + if (fieldFromInstruction32(Insn, 5, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 4, 1)) + align = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 6, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 4, 2) != 0) + align = 4; } - if (FirstCond == 0xE && ITCounter != 1) { - DEBUG(errs() << "Encoding error: IT FirstCond '1110' && Mask != '1000'"); - return false; + + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); } - ITState = bits7_0; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); - return true; + return S; } -/// Update ITState if necessary. -void Session::UpdateIT() { - assert(ITCounter); - --ITCounter; - if (ITCounter == 0) - ITState = 0; - else { - unsigned short NewITState4_0 = slice(ITState, 4, 0) << 1; - setSlice(ITState, 4, 0, NewITState4_0); + +static DecodeStatus DecodeVLD2LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + unsigned inc = 1; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + index = fieldFromInstruction32(Insn, 5, 3); + if (fieldFromInstruction32(Insn, 4, 1)) + align = 2; + break; + case 1: + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 4, 1)) + align = 4; + if (fieldFromInstruction32(Insn, 5, 1)) + inc = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 5, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 4, 1) != 0) + align = 8; + if (fieldFromInstruction32(Insn, 6, 1)) + inc = 2; + break; + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); + + return S; } -static MCDisassembler *createARMDisassembler(const Target &T) { - return new ARMDisassembler; +static DecodeStatus DecodeVST2LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + unsigned inc = 1; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + index = fieldFromInstruction32(Insn, 5, 3); + if (fieldFromInstruction32(Insn, 4, 1)) + align = 2; + break; + case 1: + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 4, 1)) + align = 4; + if (fieldFromInstruction32(Insn, 5, 1)) + inc = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 5, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 4, 1) != 0) + align = 8; + if (fieldFromInstruction32(Insn, 6, 1)) + inc = 2; + break; + } + + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); + + return S; } -static MCDisassembler *createThumbDisassembler(const Target &T) { - return new ThumbDisassembler; + +static DecodeStatus DecodeVLD3LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + unsigned inc = 1; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + if (fieldFromInstruction32(Insn, 4, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 5, 3); + break; + case 1: + if (fieldFromInstruction32(Insn, 4, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 5, 1)) + inc = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 4, 2)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 6, 1)) + inc = 2; + break; + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) + return MCDisassembler::Fail; + + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); + + return S; } -extern "C" void LLVMInitializeARMDisassembler() { - // Register the disassembler. - TargetRegistry::RegisterMCDisassembler(TheARMTarget, - createARMDisassembler); - TargetRegistry::RegisterMCDisassembler(TheThumbTarget, - createThumbDisassembler); +static DecodeStatus DecodeVST3LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + unsigned inc = 1; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + if (fieldFromInstruction32(Insn, 4, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 5, 3); + break; + case 1: + if (fieldFromInstruction32(Insn, 4, 1)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 5, 1)) + inc = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 4, 2)) + return MCDisassembler::Fail; // UNDEFINED + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 6, 1)) + inc = 2; + break; + } + + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); + + return S; } -EDInstInfo *ARMDisassembler::getEDInfo() const { - return instInfoARM; + +static DecodeStatus DecodeVLD4LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + unsigned inc = 1; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + if (fieldFromInstruction32(Insn, 4, 1)) + align = 4; + index = fieldFromInstruction32(Insn, 5, 3); + break; + case 1: + if (fieldFromInstruction32(Insn, 4, 1)) + align = 8; + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 5, 1)) + inc = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 4, 2)) + align = 4 << fieldFromInstruction32(Insn, 4, 2); + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 6, 1)) + inc = 2; + break; + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) + return MCDisassembler::Fail; + + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); + + return S; } -EDInstInfo *ThumbDisassembler::getEDInfo() const { - return instInfoARM; +static DecodeStatus DecodeVST4LN(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned Rd = fieldFromInstruction32(Insn, 12, 4); + Rd |= fieldFromInstruction32(Insn, 22, 1) << 4; + unsigned size = fieldFromInstruction32(Insn, 10, 2); + + unsigned align = 0; + unsigned index = 0; + unsigned inc = 1; + switch (size) { + default: + return MCDisassembler::Fail; + case 0: + if (fieldFromInstruction32(Insn, 4, 1)) + align = 4; + index = fieldFromInstruction32(Insn, 5, 3); + break; + case 1: + if (fieldFromInstruction32(Insn, 4, 1)) + align = 8; + index = fieldFromInstruction32(Insn, 6, 2); + if (fieldFromInstruction32(Insn, 5, 1)) + inc = 2; + break; + case 2: + if (fieldFromInstruction32(Insn, 4, 2)) + align = 4 << fieldFromInstruction32(Insn, 4, 2); + index = fieldFromInstruction32(Insn, 7, 1); + if (fieldFromInstruction32(Insn, 6, 1)) + inc = 2; + break; + } + + if (Rm != 0xF) { // Writeback + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + } + if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(align)); + if (Rm != 0xF) { + if (Rm != 0xD) { + if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) + return MCDisassembler::Fail; + } else + Inst.addOperand(MCOperand::CreateReg(0)); + } + + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateImm(index)); + + return S; +} + +static DecodeStatus DecodeVMOVSRR(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rt2 = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; + + if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) + S = MCDisassembler::SoftFail; + + if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeVMOVRRS(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rt2 = fieldFromInstruction32(Insn, 16, 4); + unsigned Rm = fieldFromInstruction32(Insn, 0, 4); + unsigned pred = fieldFromInstruction32(Insn, 28, 4); + Rm |= fieldFromInstruction32(Insn, 5, 1) << 4; + + if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) + S = MCDisassembler::SoftFail; + + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) + return MCDisassembler::Fail; + if (!Check(S, DecodePredicateOperand(Inst, pred, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + unsigned pred = fieldFromInstruction16(Insn, 4, 4); + // The InstPrinter needs to have the low bit of the predicate in + // the mask operand to be able to print it properly. + unsigned mask = fieldFromInstruction16(Insn, 0, 5); + + if (pred == 0xF) { + pred = 0xE; + S = MCDisassembler::SoftFail; + } + + if ((mask & 0xF) == 0) { + // Preserve the high bit of the mask, which is the low bit of + // the predicate. + mask &= 0x10; + mask |= 0x8; + S = MCDisassembler::SoftFail; + } + + Inst.addOperand(MCOperand::CreateImm(pred)); + Inst.addOperand(MCOperand::CreateImm(mask)); + return S; } + +static DecodeStatus +DecodeT2LDRDPreInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned addr = fieldFromInstruction32(Insn, 0, 8); + unsigned W = fieldFromInstruction32(Insn, 21, 1); + unsigned U = fieldFromInstruction32(Insn, 23, 1); + unsigned P = fieldFromInstruction32(Insn, 24, 1); + bool writeback = (W == 1) | (P == 0); + + addr |= (U << 8) | (Rn << 9); + + if (writeback && (Rn == Rt || Rn == Rt2)) + Check(S, MCDisassembler::SoftFail); + if (Rt == Rt2) + Check(S, MCDisassembler::SoftFail); + + // Rt + if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + // Rt2 + if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) + return MCDisassembler::Fail; + // Writeback operand + if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + // addr + if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus +DecodeT2STRDPreInstruction(llvm::MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + unsigned Rt = fieldFromInstruction32(Insn, 12, 4); + unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4); + unsigned Rn = fieldFromInstruction32(Insn, 16, 4); + unsigned addr = fieldFromInstruction32(Insn, 0, 8); + unsigned W = fieldFromInstruction32(Insn, 21, 1); + unsigned U = fieldFromInstruction32(Insn, 23, 1); + unsigned P = fieldFromInstruction32(Insn, 24, 1); + bool writeback = (W == 1) | (P == 0); + + addr |= (U << 8) | (Rn << 9); + + if (writeback && (Rn == Rt || Rn == Rt2)) + Check(S, MCDisassembler::SoftFail); + + // Writeback operand + if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) + return MCDisassembler::Fail; + // Rt + if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) + return MCDisassembler::Fail; + // Rt2 + if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) + return MCDisassembler::Fail; + // addr + if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) + return MCDisassembler::Fail; + + return S; +} + +static DecodeStatus DecodeT2Adr(llvm::MCInst &Inst, uint32_t Insn, + uint64_t Address, const void *Decoder) { + unsigned sign1 = fieldFromInstruction32(Insn, 21, 1); + unsigned sign2 = fieldFromInstruction32(Insn, 23, 1); + if (sign1 != sign2) return MCDisassembler::Fail; + + unsigned Val = fieldFromInstruction32(Insn, 0, 8); + Val |= fieldFromInstruction32(Insn, 12, 3) << 8; + Val |= fieldFromInstruction32(Insn, 26, 1) << 11; + Val |= sign1 << 12; + Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val))); + + return MCDisassembler::Success; +} + +static DecodeStatus DecodeT2ShifterImmOperand(llvm::MCInst &Inst, uint32_t Val, + uint64_t Address, + const void *Decoder) { + DecodeStatus S = MCDisassembler::Success; + + // Shift of "asr #32" is not allowed in Thumb2 mode. + if (Val == 0x20) S = MCDisassembler::SoftFail; + Inst.addOperand(MCOperand::CreateImm(Val)); + return S; +} + |