//===-- ARMMCTargetDesc.cpp - ARM Target Descriptions ---------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // This file provides ARM specific target descriptions. // //===----------------------------------------------------------------------===// #include "ARMMCTargetDesc.h" #include "ARMAddressingModes.h" #include "ARMBaseInfo.h" #include "ARMInstPrinter.h" #include "ARMMCAsmInfo.h" #include "TargetInfo/ARMTargetInfo.h" #include "llvm/ADT/Triple.h" #include "llvm/DebugInfo/CodeView/CodeView.h" #include "llvm/MC/MCAsmBackend.h" #include "llvm/MC/MCCodeEmitter.h" #include "llvm/MC/MCELFStreamer.h" #include "llvm/MC/MCInstrAnalysis.h" #include "llvm/MC/MCInstrInfo.h" #include "llvm/MC/MCObjectWriter.h" #include "llvm/MC/MCRegisterInfo.h" #include "llvm/MC/MCStreamer.h" #include "llvm/MC/MCSubtargetInfo.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/TargetParser.h" #include "llvm/Support/TargetRegistry.h" using namespace llvm; #define GET_REGINFO_MC_DESC #include "ARMGenRegisterInfo.inc" static bool getMCRDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, std::string &Info) { if (STI.getFeatureBits()[llvm::ARM::HasV7Ops] && (MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 15) && (MI.getOperand(1).isImm() && MI.getOperand(1).getImm() == 0) && // Checks for the deprecated CP15ISB encoding: // mcr p15, #0, rX, c7, c5, #4 (MI.getOperand(3).isImm() && MI.getOperand(3).getImm() == 7)) { if ((MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 4)) { if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 5) { Info = "deprecated since v7, use 'isb'"; return true; } // Checks for the deprecated CP15DSB encoding: // mcr p15, #0, rX, c7, c10, #4 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10) { Info = "deprecated since v7, use 'dsb'"; return true; } } // Checks for the deprecated CP15DMB encoding: // mcr p15, #0, rX, c7, c10, #5 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10 && (MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 5)) { Info = "deprecated since v7, use 'dmb'"; return true; } } if (STI.getFeatureBits()[llvm::ARM::HasV7Ops] && ((MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 10) || (MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 11))) { Info = "since v7, cp10 and cp11 are reserved for advanced SIMD or floating " "point instructions"; return true; } return false; } static bool getMRCDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, std::string &Info) { if (STI.getFeatureBits()[llvm::ARM::HasV7Ops] && ((MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 10) || (MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 11))) { Info = "since v7, cp10 and cp11 are reserved for advanced SIMD or floating " "point instructions"; return true; } return false; } static bool getITDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, std::string &Info) { if (STI.getFeatureBits()[llvm::ARM::HasV8Ops] && MI.getOperand(1).isImm() && MI.getOperand(1).getImm() != 8) { Info = "applying IT instruction to more than one subsequent instruction is " "deprecated"; return true; } return false; } static bool getARMStoreDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, std::string &Info) { assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] && "cannot predicate thumb instructions"); assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments"); for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) { assert(MI.getOperand(OI).isReg() && "expected register"); if (MI.getOperand(OI).getReg() == ARM::PC) { Info = "use of PC in the list is deprecated"; return true; } } return false; } static bool getARMLoadDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, std::string &Info) { assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] && "cannot predicate thumb instructions"); assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments"); bool ListContainsPC = false, ListContainsLR = false; for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) { assert(MI.getOperand(OI).isReg() && "expected register"); switch (MI.getOperand(OI).getReg()) { default: break; case ARM::LR: ListContainsLR = true; break; case ARM::PC: ListContainsPC = true; break; } } if (ListContainsPC && ListContainsLR) { Info = "use of LR and PC simultaneously in the list is deprecated"; return true; } return false; } #define GET_INSTRINFO_MC_DESC #include "ARMGenInstrInfo.inc" #define GET_SUBTARGETINFO_MC_DESC #include "ARMGenSubtargetInfo.inc" std::string ARM_MC::ParseARMTriple(const Triple &TT, StringRef CPU) { std::string ARMArchFeature; ARM::ArchKind ArchID = ARM::parseArch(TT.getArchName()); if (ArchID != ARM::ArchKind::INVALID && (CPU.empty() || CPU == "generic")) ARMArchFeature = (ARMArchFeature + "+" + ARM::getArchName(ArchID)).str(); if (TT.isThumb()) { if (!ARMArchFeature.empty()) ARMArchFeature += ","; ARMArchFeature += "+thumb-mode,+v4t"; } if (TT.isOSNaCl()) { if (!ARMArchFeature.empty()) ARMArchFeature += ","; ARMArchFeature += "+nacl-trap"; } if (TT.isOSWindows()) { if (!ARMArchFeature.empty()) ARMArchFeature += ","; ARMArchFeature += "+noarm"; } return ARMArchFeature; } bool ARM_MC::isPredicated(const MCInst &MI, const MCInstrInfo *MCII) { const MCInstrDesc &Desc = MCII->get(MI.getOpcode()); int PredOpIdx = Desc.findFirstPredOperandIdx(); return PredOpIdx != -1 && MI.getOperand(PredOpIdx).getImm() != ARMCC::AL; } bool ARM_MC::isCPSRDefined(const MCInst &MI, const MCInstrInfo *MCII) { const MCInstrDesc &Desc = MCII->get(MI.getOpcode()); for (unsigned I = 0; I < MI.getNumOperands(); ++I) { const MCOperand &MO = MI.getOperand(I); if (MO.isReg() && MO.getReg() == ARM::CPSR && Desc.OpInfo[I].isOptionalDef()) return true; } return false; } uint64_t ARM_MC::evaluateBranchTarget(const MCInstrDesc &InstDesc, uint64_t Addr, int64_t Imm) { // For ARM instructions the PC offset is 8 bytes, for Thumb instructions it // is 4 bytes. uint64_t Offset = ((InstDesc.TSFlags & ARMII::FormMask) == ARMII::ThumbFrm) ? 4 : 8; // A Thumb instruction BLX(i) can be 16-bit aligned while targets Arm code // which is 32-bit aligned. The target address for the case is calculated as // targetAddress = Align(PC,4) + imm32; // where // Align(x, y) = y * (x DIV y); if (InstDesc.getOpcode() == ARM::tBLXi) Addr &= ~0x3; return Addr + Imm + Offset; } MCSubtargetInfo *ARM_MC::createARMMCSubtargetInfo(const Triple &TT, StringRef CPU, StringRef FS) { std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPU); if (!FS.empty()) { if (!ArchFS.empty()) ArchFS = (Twine(ArchFS) + "," + FS).str(); else ArchFS = std::string(FS); } return createARMMCSubtargetInfoImpl(TT, CPU, /*TuneCPU*/ CPU, ArchFS); } static MCInstrInfo *createARMMCInstrInfo() { MCInstrInfo *X = new MCInstrInfo(); InitARMMCInstrInfo(X); return X; } void ARM_MC::initLLVMToCVRegMapping(MCRegisterInfo *MRI) { // Mapping from CodeView to MC register id. static const struct { codeview::RegisterId CVReg; MCPhysReg Reg; } RegMap[] = { {codeview::RegisterId::ARM_R0, ARM::R0}, {codeview::RegisterId::ARM_R1, ARM::R1}, {codeview::RegisterId::ARM_R2, ARM::R2}, {codeview::RegisterId::ARM_R3, ARM::R3}, {codeview::RegisterId::ARM_R4, ARM::R4}, {codeview::RegisterId::ARM_R5, ARM::R5}, {codeview::RegisterId::ARM_R6, ARM::R6}, {codeview::RegisterId::ARM_R7, ARM::R7}, {codeview::RegisterId::ARM_R8, ARM::R8}, {codeview::RegisterId::ARM_R9, ARM::R9}, {codeview::RegisterId::ARM_R10, ARM::R10}, {codeview::RegisterId::ARM_R11, ARM::R11}, {codeview::RegisterId::ARM_R12, ARM::R12}, {codeview::RegisterId::ARM_SP, ARM::SP}, {codeview::RegisterId::ARM_LR, ARM::LR}, {codeview::RegisterId::ARM_PC, ARM::PC}, {codeview::RegisterId::ARM_CPSR, ARM::CPSR}, {codeview::RegisterId::ARM_FPSCR, ARM::FPSCR}, {codeview::RegisterId::ARM_FPEXC, ARM::FPEXC}, {codeview::RegisterId::ARM_FS0, ARM::S0}, {codeview::RegisterId::ARM_FS1, ARM::S1}, {codeview::RegisterId::ARM_FS2, ARM::S2}, {codeview::RegisterId::ARM_FS3, ARM::S3}, {codeview::RegisterId::ARM_FS4, ARM::S4}, {codeview::RegisterId::ARM_FS5, ARM::S5}, {codeview::RegisterId::ARM_FS6, ARM::S6}, {codeview::RegisterId::ARM_FS7, ARM::S7}, {codeview::RegisterId::ARM_FS8, ARM::S8}, {codeview::RegisterId::ARM_FS9, ARM::S9}, {codeview::RegisterId::ARM_FS10, ARM::S10}, {codeview::RegisterId::ARM_FS11, ARM::S11}, {codeview::RegisterId::ARM_FS12, ARM::S12}, {codeview::RegisterId::ARM_FS13, ARM::S13}, {codeview::RegisterId::ARM_FS14, ARM::S14}, {codeview::RegisterId::ARM_FS15, ARM::S15}, {codeview::RegisterId::ARM_FS16, ARM::S16}, {codeview::RegisterId::ARM_FS17, ARM::S17}, {codeview::RegisterId::ARM_FS18, ARM::S18}, {codeview::RegisterId::ARM_FS19, ARM::S19}, {codeview::RegisterId::ARM_FS20, ARM::S20}, {codeview::RegisterId::ARM_FS21, ARM::S21}, {codeview::RegisterId::ARM_FS22, ARM::S22}, {codeview::RegisterId::ARM_FS23, ARM::S23}, {codeview::RegisterId::ARM_FS24, ARM::S24}, {codeview::RegisterId::ARM_FS25, ARM::S25}, {codeview::RegisterId::ARM_FS26, ARM::S26}, {codeview::RegisterId::ARM_FS27, ARM::S27}, {codeview::RegisterId::ARM_FS28, ARM::S28}, {codeview::RegisterId::ARM_FS29, ARM::S29}, {codeview::RegisterId::ARM_FS30, ARM::S30}, {codeview::RegisterId::ARM_FS31, ARM::S31}, {codeview::RegisterId::ARM_ND0, ARM::D0}, {codeview::RegisterId::ARM_ND1, ARM::D1}, {codeview::RegisterId::ARM_ND2, ARM::D2}, {codeview::RegisterId::ARM_ND3, ARM::D3}, {codeview::RegisterId::ARM_ND4, ARM::D4}, {codeview::RegisterId::ARM_ND5, ARM::D5}, {codeview::RegisterId::ARM_ND6, ARM::D6}, {codeview::RegisterId::ARM_ND7, ARM::D7}, {codeview::RegisterId::ARM_ND8, ARM::D8}, {codeview::RegisterId::ARM_ND9, ARM::D9}, {codeview::RegisterId::ARM_ND10, ARM::D10}, {codeview::RegisterId::ARM_ND11, ARM::D11}, {codeview::RegisterId::ARM_ND12, ARM::D12}, {codeview::RegisterId::ARM_ND13, ARM::D13}, {codeview::RegisterId::ARM_ND14, ARM::D14}, {codeview::RegisterId::ARM_ND15, ARM::D15}, {codeview::RegisterId::ARM_ND16, ARM::D16}, {codeview::RegisterId::ARM_ND17, ARM::D17}, {codeview::RegisterId::ARM_ND18, ARM::D18}, {codeview::RegisterId::ARM_ND19, ARM::D19}, {codeview::RegisterId::ARM_ND20, ARM::D20}, {codeview::RegisterId::ARM_ND21, ARM::D21}, {codeview::RegisterId::ARM_ND22, ARM::D22}, {codeview::RegisterId::ARM_ND23, ARM::D23}, {codeview::RegisterId::ARM_ND24, ARM::D24}, {codeview::RegisterId::ARM_ND25, ARM::D25}, {codeview::RegisterId::ARM_ND26, ARM::D26}, {codeview::RegisterId::ARM_ND27, ARM::D27}, {codeview::RegisterId::ARM_ND28, ARM::D28}, {codeview::RegisterId::ARM_ND29, ARM::D29}, {codeview::RegisterId::ARM_ND30, ARM::D30}, {codeview::RegisterId::ARM_ND31, ARM::D31}, {codeview::RegisterId::ARM_NQ0, ARM::Q0}, {codeview::RegisterId::ARM_NQ1, ARM::Q1}, {codeview::RegisterId::ARM_NQ2, ARM::Q2}, {codeview::RegisterId::ARM_NQ3, ARM::Q3}, {codeview::RegisterId::ARM_NQ4, ARM::Q4}, {codeview::RegisterId::ARM_NQ5, ARM::Q5}, {codeview::RegisterId::ARM_NQ6, ARM::Q6}, {codeview::RegisterId::ARM_NQ7, ARM::Q7}, {codeview::RegisterId::ARM_NQ8, ARM::Q8}, {codeview::RegisterId::ARM_NQ9, ARM::Q9}, {codeview::RegisterId::ARM_NQ10, ARM::Q10}, {codeview::RegisterId::ARM_NQ11, ARM::Q11}, {codeview::RegisterId::ARM_NQ12, ARM::Q12}, {codeview::RegisterId::ARM_NQ13, ARM::Q13}, {codeview::RegisterId::ARM_NQ14, ARM::Q14}, {codeview::RegisterId::ARM_NQ15, ARM::Q15}, }; for (unsigned I = 0; I < array_lengthof(RegMap); ++I) MRI->mapLLVMRegToCVReg(RegMap[I].Reg, static_cast(RegMap[I].CVReg)); } static MCRegisterInfo *createARMMCRegisterInfo(const Triple &Triple) { MCRegisterInfo *X = new MCRegisterInfo(); InitARMMCRegisterInfo(X, ARM::LR, 0, 0, ARM::PC); ARM_MC::initLLVMToCVRegMapping(X); return X; } static MCAsmInfo *createARMMCAsmInfo(const MCRegisterInfo &MRI, const Triple &TheTriple, const MCTargetOptions &Options) { MCAsmInfo *MAI; if (TheTriple.isOSDarwin() || TheTriple.isOSBinFormatMachO()) MAI = new ARMMCAsmInfoDarwin(TheTriple); else if (TheTriple.isWindowsMSVCEnvironment()) MAI = new ARMCOFFMCAsmInfoMicrosoft(); else if (TheTriple.isOSWindows()) MAI = new ARMCOFFMCAsmInfoGNU(); else MAI = new ARMELFMCAsmInfo(TheTriple); unsigned Reg = MRI.getDwarfRegNum(ARM::SP, true); MAI->addInitialFrameState(MCCFIInstruction::cfiDefCfa(nullptr, Reg, 0)); return MAI; } static MCStreamer *createELFStreamer(const Triple &T, MCContext &Ctx, std::unique_ptr &&MAB, std::unique_ptr &&OW, std::unique_ptr &&Emitter, bool RelaxAll) { return createARMELFStreamer( Ctx, std::move(MAB), std::move(OW), std::move(Emitter), false, (T.getArch() == Triple::thumb || T.getArch() == Triple::thumbeb), T.isAndroid()); } static MCStreamer * createARMMachOStreamer(MCContext &Ctx, std::unique_ptr &&MAB, std::unique_ptr &&OW, std::unique_ptr &&Emitter, bool RelaxAll, bool DWARFMustBeAtTheEnd) { return createMachOStreamer(Ctx, std::move(MAB), std::move(OW), std::move(Emitter), false, DWARFMustBeAtTheEnd); } static MCInstPrinter *createARMMCInstPrinter(const Triple &T, unsigned SyntaxVariant, const MCAsmInfo &MAI, const MCInstrInfo &MII, const MCRegisterInfo &MRI) { if (SyntaxVariant == 0) return new ARMInstPrinter(MAI, MII, MRI); return nullptr; } static MCRelocationInfo *createARMMCRelocationInfo(const Triple &TT, MCContext &Ctx) { if (TT.isOSBinFormatMachO()) return createARMMachORelocationInfo(Ctx); // Default to the stock relocation info. return llvm::createMCRelocationInfo(TT, Ctx); } namespace { class ARMMCInstrAnalysis : public MCInstrAnalysis { public: ARMMCInstrAnalysis(const MCInstrInfo *Info) : MCInstrAnalysis(Info) {} bool isUnconditionalBranch(const MCInst &Inst) const override { // BCCs with the "always" predicate are unconditional branches. if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL) return true; return MCInstrAnalysis::isUnconditionalBranch(Inst); } bool isConditionalBranch(const MCInst &Inst) const override { // BCCs with the "always" predicate are unconditional branches. if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL) return false; return MCInstrAnalysis::isConditionalBranch(Inst); } bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size, uint64_t &Target) const override { const MCInstrDesc &Desc = Info->get(Inst.getOpcode()); // Find the PC-relative immediate operand in the instruction. for (unsigned OpNum = 0; OpNum < Desc.getNumOperands(); ++OpNum) { if (Inst.getOperand(OpNum).isImm() && Desc.OpInfo[OpNum].OperandType == MCOI::OPERAND_PCREL) { int64_t Imm = Inst.getOperand(OpNum).getImm(); Target = ARM_MC::evaluateBranchTarget(Desc, Addr, Imm); return true; } } return false; } }; } static MCInstrAnalysis *createARMMCInstrAnalysis(const MCInstrInfo *Info) { return new ARMMCInstrAnalysis(Info); } bool ARM::isCDECoproc(size_t Coproc, const MCSubtargetInfo &STI) { // Unfortunately we don't have ARMTargetInfo in the disassembler, so we have // to rely on feature bits. if (Coproc >= 8) return false; return STI.getFeatureBits()[ARM::FeatureCoprocCDE0 + Coproc]; } // Force static initialization. extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMTargetMC() { for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget(), &getTheThumbLETarget(), &getTheThumbBETarget()}) { // Register the MC asm info. RegisterMCAsmInfoFn X(*T, createARMMCAsmInfo); // Register the MC instruction info. TargetRegistry::RegisterMCInstrInfo(*T, createARMMCInstrInfo); // Register the MC register info. TargetRegistry::RegisterMCRegInfo(*T, createARMMCRegisterInfo); // Register the MC subtarget info. TargetRegistry::RegisterMCSubtargetInfo(*T, ARM_MC::createARMMCSubtargetInfo); TargetRegistry::RegisterELFStreamer(*T, createELFStreamer); TargetRegistry::RegisterCOFFStreamer(*T, createARMWinCOFFStreamer); TargetRegistry::RegisterMachOStreamer(*T, createARMMachOStreamer); // Register the obj target streamer. TargetRegistry::RegisterObjectTargetStreamer(*T, createARMObjectTargetStreamer); // Register the asm streamer. TargetRegistry::RegisterAsmTargetStreamer(*T, createARMTargetAsmStreamer); // Register the null TargetStreamer. TargetRegistry::RegisterNullTargetStreamer(*T, createARMNullTargetStreamer); // Register the MCInstPrinter. TargetRegistry::RegisterMCInstPrinter(*T, createARMMCInstPrinter); // Register the MC relocation info. TargetRegistry::RegisterMCRelocationInfo(*T, createARMMCRelocationInfo); } // Register the MC instruction analyzer. for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget(), &getTheThumbLETarget(), &getTheThumbBETarget()}) TargetRegistry::RegisterMCInstrAnalysis(*T, createARMMCInstrAnalysis); for (Target *T : {&getTheARMLETarget(), &getTheThumbLETarget()}) { TargetRegistry::RegisterMCCodeEmitter(*T, createARMLEMCCodeEmitter); TargetRegistry::RegisterMCAsmBackend(*T, createARMLEAsmBackend); } for (Target *T : {&getTheARMBETarget(), &getTheThumbBETarget()}) { TargetRegistry::RegisterMCCodeEmitter(*T, createARMBEMCCodeEmitter); TargetRegistry::RegisterMCAsmBackend(*T, createARMBEAsmBackend); } }