| //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains a printer that converts from our internal representation |
| // of machine-dependent LLVM code to PowerPC assembly language. This printer is |
| // the output mechanism used by `llc'. |
| // |
| // Documentation at http://developer.apple.com/documentation/DeveloperTools/ |
| // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "PPC.h" |
| #include "InstPrinter/PPCInstPrinter.h" |
| #include "MCTargetDesc/PPCMCExpr.h" |
| #include "MCTargetDesc/PPCPredicates.h" |
| #include "PPCMachineFunctionInfo.h" |
| #include "PPCSubtarget.h" |
| #include "PPCTargetMachine.h" |
| #include "PPCTargetStreamer.h" |
| #include "llvm/ADT/MapVector.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/CodeGen/MachineConstantPool.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineModuleInfoImpls.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/CodeGen/StackMaps.h" |
| #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" |
| #include "llvm/IR/Constants.h" |
| #include "llvm/IR/DebugInfo.h" |
| #include "llvm/IR/DerivedTypes.h" |
| #include "llvm/IR/Mangler.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/MC/MCInstBuilder.h" |
| #include "llvm/MC/MCSectionELF.h" |
| #include "llvm/MC/MCSectionMachO.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ELF.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/TargetRegistry.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/Target/TargetInstrInfo.h" |
| #include "llvm/Target/TargetOptions.h" |
| #include "llvm/Target/TargetRegisterInfo.h" |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "asmprinter" |
| |
| namespace { |
| class PPCAsmPrinter : public AsmPrinter { |
| protected: |
| MapVector<MCSymbol*, MCSymbol*> TOC; |
| const PPCSubtarget &Subtarget; |
| uint64_t TOCLabelID; |
| StackMaps SM; |
| public: |
| explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : AsmPrinter(TM, Streamer), |
| Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0), SM(*this) {} |
| |
| const char *getPassName() const override { |
| return "PowerPC Assembly Printer"; |
| } |
| |
| MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym); |
| |
| void EmitInstruction(const MachineInstr *MI) override; |
| |
| void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O); |
| |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode, |
| raw_ostream &O) override; |
| bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode, |
| raw_ostream &O) override; |
| |
| void EmitEndOfAsmFile(Module &M) override; |
| |
| void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM, |
| const MachineInstr &MI); |
| void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM, |
| const MachineInstr &MI); |
| }; |
| |
| /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux |
| class PPCLinuxAsmPrinter : public PPCAsmPrinter { |
| public: |
| explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : PPCAsmPrinter(TM, Streamer) {} |
| |
| const char *getPassName() const override { |
| return "Linux PPC Assembly Printer"; |
| } |
| |
| bool doFinalization(Module &M) override; |
| void EmitStartOfAsmFile(Module &M) override; |
| |
| void EmitFunctionEntryLabel() override; |
| |
| void EmitFunctionBodyStart() override; |
| void EmitFunctionBodyEnd() override; |
| }; |
| |
| /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac |
| /// OS X |
| class PPCDarwinAsmPrinter : public PPCAsmPrinter { |
| public: |
| explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : PPCAsmPrinter(TM, Streamer) {} |
| |
| const char *getPassName() const override { |
| return "Darwin PPC Assembly Printer"; |
| } |
| |
| bool doFinalization(Module &M) override; |
| void EmitStartOfAsmFile(Module &M) override; |
| |
| void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs); |
| }; |
| } // end of anonymous namespace |
| |
| /// stripRegisterPrefix - This method strips the character prefix from a |
| /// register name so that only the number is left. Used by for linux asm. |
| static const char *stripRegisterPrefix(const char *RegName) { |
| switch (RegName[0]) { |
| case 'r': |
| case 'f': |
| case 'v': |
| if (RegName[1] == 's') |
| return RegName + 2; |
| return RegName + 1; |
| case 'c': if (RegName[1] == 'r') return RegName + 2; |
| } |
| |
| return RegName; |
| } |
| |
| void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo, |
| raw_ostream &O) { |
| const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout(); |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| |
| switch (MO.getType()) { |
| case MachineOperand::MO_Register: { |
| const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg()); |
| // Linux assembler (Others?) does not take register mnemonics. |
| // FIXME - What about special registers used in mfspr/mtspr? |
| if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName); |
| O << RegName; |
| return; |
| } |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| return; |
| |
| case MachineOperand::MO_MachineBasicBlock: |
| O << *MO.getMBB()->getSymbol(); |
| return; |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() |
| << '_' << MO.getIndex(); |
| return; |
| case MachineOperand::MO_BlockAddress: |
| O << *GetBlockAddressSymbol(MO.getBlockAddress()); |
| return; |
| case MachineOperand::MO_GlobalAddress: { |
| // Computing the address of a global symbol, not calling it. |
| const GlobalValue *GV = MO.getGlobal(); |
| MCSymbol *SymToPrint; |
| |
| // External or weakly linked global variables need non-lazily-resolved stubs |
| if (TM.getRelocationModel() != Reloc::Static && |
| (GV->isDeclaration() || GV->isWeakForLinker())) { |
| if (!GV->hasHiddenVisibility()) { |
| SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>() |
| .getGVStubEntry(SymToPrint); |
| if (!StubSym.getPointer()) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(getSymbol(GV), !GV->hasInternalLinkage()); |
| } else if (GV->isDeclaration() || GV->hasCommonLinkage() || |
| GV->hasAvailableExternallyLinkage()) { |
| SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); |
| |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>(). |
| getHiddenGVStubEntry(SymToPrint); |
| if (!StubSym.getPointer()) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(getSymbol(GV), !GV->hasInternalLinkage()); |
| } else { |
| SymToPrint = getSymbol(GV); |
| } |
| } else { |
| SymToPrint = getSymbol(GV); |
| } |
| |
| O << *SymToPrint; |
| |
| printOffset(MO.getOffset(), O); |
| return; |
| } |
| |
| default: |
| O << "<unknown operand type: " << (unsigned)MO.getType() << ">"; |
| return; |
| } |
| } |
| |
| /// PrintAsmOperand - Print out an operand for an inline asm expression. |
| /// |
| bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode, raw_ostream &O) { |
| // Does this asm operand have a single letter operand modifier? |
| if (ExtraCode && ExtraCode[0]) { |
| if (ExtraCode[1] != 0) return true; // Unknown modifier. |
| |
| switch (ExtraCode[0]) { |
| default: |
| // See if this is a generic print operand |
| return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O); |
| case 'c': // Don't print "$" before a global var name or constant. |
| break; // PPC never has a prefix. |
| case 'L': // Write second word of DImode reference. |
| // Verify that this operand has two consecutive registers. |
| if (!MI->getOperand(OpNo).isReg() || |
| OpNo+1 == MI->getNumOperands() || |
| !MI->getOperand(OpNo+1).isReg()) |
| return true; |
| ++OpNo; // Return the high-part. |
| break; |
| case 'I': |
| // Write 'i' if an integer constant, otherwise nothing. Used to print |
| // addi vs add, etc. |
| if (MI->getOperand(OpNo).isImm()) |
| O << "i"; |
| return false; |
| } |
| } |
| |
| printOperand(MI, OpNo, O); |
| return false; |
| } |
| |
| // At the moment, all inline asm memory operands are a single register. |
| // In any case, the output of this routine should always be just one |
| // assembler operand. |
| |
| bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode, |
| raw_ostream &O) { |
| if (ExtraCode && ExtraCode[0]) { |
| if (ExtraCode[1] != 0) return true; // Unknown modifier. |
| |
| switch (ExtraCode[0]) { |
| default: return true; // Unknown modifier. |
| case 'y': // A memory reference for an X-form instruction |
| { |
| const char *RegName = "r0"; |
| if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName); |
| O << RegName << ", "; |
| printOperand(MI, OpNo, O); |
| return false; |
| } |
| case 'U': // Print 'u' for update form. |
| case 'X': // Print 'x' for indexed form. |
| { |
| // FIXME: Currently for PowerPC memory operands are always loaded |
| // into a register, so we never get an update or indexed form. |
| // This is bad even for offset forms, since even if we know we |
| // have a value in -16(r1), we will generate a load into r<n> |
| // and then load from 0(r<n>). Until that issue is fixed, |
| // tolerate 'U' and 'X' but don't output anything. |
| assert(MI->getOperand(OpNo).isReg()); |
| return false; |
| } |
| } |
| } |
| |
| assert(MI->getOperand(OpNo).isReg()); |
| O << "0("; |
| printOperand(MI, OpNo, O); |
| O << ")"; |
| return false; |
| } |
| |
| |
| /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry |
| /// exists for it. If not, create one. Then return a symbol that references |
| /// the TOC entry. |
| MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) { |
| const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout(); |
| MCSymbol *&TOCEntry = TOC[Sym]; |
| |
| // To avoid name clash check if the name already exists. |
| while (!TOCEntry) { |
| if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) + |
| "C" + Twine(TOCLabelID++)) == nullptr) { |
| TOCEntry = GetTempSymbol("C", TOCLabelID); |
| } |
| } |
| |
| return TOCEntry; |
| } |
| |
| void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) { |
| SM.serializeToStackMapSection(); |
| } |
| |
| void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM, |
| const MachineInstr &MI) { |
| unsigned NumNOPBytes = MI.getOperand(1).getImm(); |
| |
| SM.recordStackMap(MI); |
| assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!"); |
| |
| // Scan ahead to trim the shadow. |
| const MachineBasicBlock &MBB = *MI.getParent(); |
| MachineBasicBlock::const_iterator MII(MI); |
| ++MII; |
| while (NumNOPBytes > 0) { |
| if (MII == MBB.end() || MII->isCall() || |
| MII->getOpcode() == PPC::DBG_VALUE || |
| MII->getOpcode() == TargetOpcode::PATCHPOINT || |
| MII->getOpcode() == TargetOpcode::STACKMAP) |
| break; |
| ++MII; |
| NumNOPBytes -= 4; |
| } |
| |
| // Emit nops. |
| for (unsigned i = 0; i < NumNOPBytes; i += 4) |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP)); |
| } |
| |
| // Lower a patchpoint of the form: |
| // [<def>], <id>, <numBytes>, <target>, <numArgs> |
| void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM, |
| const MachineInstr &MI) { |
| SM.recordPatchPoint(MI); |
| PatchPointOpers Opers(&MI); |
| |
| int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm(); |
| unsigned EncodedBytes = 0; |
| if (CallTarget) { |
| assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget && |
| "High 16 bits of call target should be zero."); |
| unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg(); |
| EncodedBytes = 6*4; |
| // Materialize the jump address: |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8) |
| .addReg(ScratchReg) |
| .addImm((CallTarget >> 32) & 0xFFFF)); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC) |
| .addReg(ScratchReg) |
| .addReg(ScratchReg) |
| .addImm(32).addImm(16)); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8) |
| .addReg(ScratchReg) |
| .addReg(ScratchReg) |
| .addImm((CallTarget >> 16) & 0xFFFF)); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8) |
| .addReg(ScratchReg) |
| .addReg(ScratchReg) |
| .addImm(CallTarget & 0xFFFF)); |
| |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg)); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8)); |
| } |
| |
| // Emit padding. |
| unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm(); |
| assert(NumBytes >= EncodedBytes && |
| "Patchpoint can't request size less than the length of a call."); |
| assert((NumBytes - EncodedBytes) % 4 == 0 && |
| "Invalid number of NOP bytes requested!"); |
| for (unsigned i = EncodedBytes; i < NumBytes; i += 4) |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP)); |
| } |
| |
| /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to |
| /// the current output stream. |
| /// |
| void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) { |
| MCInst TmpInst; |
| bool isPPC64 = Subtarget.isPPC64(); |
| bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin(); |
| const Module *M = MF->getFunction()->getParent(); |
| PICLevel::Level PL = M->getPICLevel(); |
| |
| // Lower multi-instruction pseudo operations. |
| switch (MI->getOpcode()) { |
| default: break; |
| case TargetOpcode::DBG_VALUE: |
| llvm_unreachable("Should be handled target independently"); |
| case TargetOpcode::STACKMAP: |
| return LowerSTACKMAP(OutStreamer, SM, *MI); |
| case TargetOpcode::PATCHPOINT: |
| return LowerPATCHPOINT(OutStreamer, SM, *MI); |
| |
| case PPC::MoveGOTtoLR: { |
| // Transform %LR = MoveGOTtoLR |
| // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4 |
| // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding |
| // _GLOBAL_OFFSET_TABLE_) has exactly one instruction: |
| // blrl |
| // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local |
| MCSymbol *GOTSymbol = |
| OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_")); |
| const MCExpr *OffsExpr = |
| MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, |
| MCSymbolRefExpr::VK_PPC_LOCAL, |
| OutContext), |
| MCConstantExpr::Create(4, OutContext), |
| OutContext); |
| |
| // Emit the 'bl'. |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr)); |
| return; |
| } |
| case PPC::MovePCtoLR: |
| case PPC::MovePCtoLR8: { |
| // Transform %LR = MovePCtoLR |
| // Into this, where the label is the PIC base: |
| // bl L1$pb |
| // L1$pb: |
| MCSymbol *PICBase = MF->getPICBaseSymbol(); |
| |
| // Emit the 'bl'. |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL) |
| // FIXME: We would like an efficient form for this, so we don't have to do |
| // a lot of extra uniquing. |
| .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext))); |
| |
| // Emit the label. |
| OutStreamer.EmitLabel(PICBase); |
| return; |
| } |
| case PPC::UpdateGBR: { |
| // Transform %Rd = UpdateGBR(%Rt, %Ri) |
| // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri) |
| // add %Rd, %Rt, %Ri |
| // Get the offset from the GOT Base Register to the GOT |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| MCSymbol *PICOffset = |
| MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol(); |
| TmpInst.setOpcode(PPC::LWZ); |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext); |
| const MCExpr *PB = |
| MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), |
| MCSymbolRefExpr::VK_None, |
| OutContext); |
| const MCOperand TR = TmpInst.getOperand(1); |
| const MCOperand PICR = TmpInst.getOperand(0); |
| |
| // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri) |
| TmpInst.getOperand(1) = |
| MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext)); |
| TmpInst.getOperand(0) = TR; |
| TmpInst.getOperand(2) = PICR; |
| EmitToStreamer(OutStreamer, TmpInst); |
| |
| TmpInst.setOpcode(PPC::ADD4); |
| TmpInst.getOperand(0) = PICR; |
| TmpInst.getOperand(1) = TR; |
| TmpInst.getOperand(2) = PICR; |
| EmitToStreamer(OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::LWZtoc: { |
| // Transform %R3 = LWZtoc <ga:@min1>, %R2 |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| |
| // Change the opcode to LWZ, and the global address operand to be a |
| // reference to the GOT entry we will synthesize later. |
| TmpInst.setOpcode(PPC::LWZ); |
| const MachineOperand &MO = MI->getOperand(1); |
| |
| // Map symbol -> label of TOC entry |
| assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()); |
| MCSymbol *MOSymbol = nullptr; |
| if (MO.isGlobal()) |
| MOSymbol = getSymbol(MO.getGlobal()); |
| else if (MO.isCPI()) |
| MOSymbol = GetCPISymbol(MO.getIndex()); |
| else if (MO.isJTI()) |
| MOSymbol = GetJTISymbol(MO.getIndex()); |
| else if (MO.isBlockAddress()) |
| MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress()); |
| |
| if (PL == PICLevel::Small) { |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT, |
| OutContext); |
| TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); |
| } else { |
| MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol); |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None, |
| OutContext); |
| const MCExpr *PB = |
| MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")), |
| OutContext); |
| Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext); |
| TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); |
| } |
| EmitToStreamer(OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::LDtocJTI: |
| case PPC::LDtocCPT: |
| case PPC::LDtocBA: |
| case PPC::LDtoc: { |
| // Transform %X3 = LDtoc <ga:@min1>, %X2 |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| |
| // Change the opcode to LD, and the global address operand to be a |
| // reference to the TOC entry we will synthesize later. |
| TmpInst.setOpcode(PPC::LD); |
| const MachineOperand &MO = MI->getOperand(1); |
| |
| // Map symbol -> label of TOC entry |
| assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()); |
| MCSymbol *MOSymbol = nullptr; |
| if (MO.isGlobal()) |
| MOSymbol = getSymbol(MO.getGlobal()); |
| else if (MO.isCPI()) |
| MOSymbol = GetCPISymbol(MO.getIndex()); |
| else if (MO.isJTI()) |
| MOSymbol = GetJTISymbol(MO.getIndex()); |
| else if (MO.isBlockAddress()) |
| MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress()); |
| |
| MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol); |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC, |
| OutContext); |
| TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); |
| EmitToStreamer(OutStreamer, TmpInst); |
| return; |
| } |
| |
| case PPC::ADDIStocHA: { |
| // Transform %Xd = ADDIStocHA %X2, <ga:@sym> |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| |
| // Change the opcode to ADDIS8. If the global address is external, has |
| // common linkage, is a non-local function address, or is a jump table |
| // address, then generate a TOC entry and reference that. Otherwise |
| // reference the symbol directly. |
| TmpInst.setOpcode(PPC::ADDIS8); |
| const MachineOperand &MO = MI->getOperand(2); |
| assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || |
| MO.isBlockAddress()) && |
| "Invalid operand for ADDIStocHA!"); |
| MCSymbol *MOSymbol = nullptr; |
| bool IsExternal = false; |
| bool IsNonLocalFunction = false; |
| bool IsCommon = false; |
| bool IsAvailExt = false; |
| |
| if (MO.isGlobal()) { |
| const GlobalValue *GV = MO.getGlobal(); |
| MOSymbol = getSymbol(GV); |
| IsExternal = GV->isDeclaration(); |
| IsCommon = GV->hasCommonLinkage(); |
| IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() && |
| (GV->isDeclaration() || GV->isWeakForLinker()); |
| IsAvailExt = GV->hasAvailableExternallyLinkage(); |
| } else if (MO.isCPI()) |
| MOSymbol = GetCPISymbol(MO.getIndex()); |
| else if (MO.isJTI()) |
| MOSymbol = GetJTISymbol(MO.getIndex()); |
| else if (MO.isBlockAddress()) |
| MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress()); |
| |
| if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt || |
| MO.isJTI() || MO.isBlockAddress() || |
| TM.getCodeModel() == CodeModel::Large) |
| MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA, |
| OutContext); |
| TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp); |
| EmitToStreamer(OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::LDtocL: { |
| // Transform %Xd = LDtocL <ga:@sym>, %Xs |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| |
| // Change the opcode to LD. If the global address is external, has |
| // common linkage, or is a jump table address, then reference the |
| // associated TOC entry. Otherwise reference the symbol directly. |
| TmpInst.setOpcode(PPC::LD); |
| const MachineOperand &MO = MI->getOperand(1); |
| assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || |
| MO.isBlockAddress()) && |
| "Invalid operand for LDtocL!"); |
| MCSymbol *MOSymbol = nullptr; |
| |
| if (MO.isJTI()) |
| MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex())); |
| else if (MO.isBlockAddress()) { |
| MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress()); |
| MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); |
| } |
| else if (MO.isCPI()) { |
| MOSymbol = GetCPISymbol(MO.getIndex()); |
| if (TM.getCodeModel() == CodeModel::Large) |
| MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); |
| } |
| else if (MO.isGlobal()) { |
| const GlobalValue *GValue = MO.getGlobal(); |
| MOSymbol = getSymbol(GValue); |
| if (GValue->getType()->getElementType()->isFunctionTy() || |
| GValue->isDeclaration() || GValue->hasCommonLinkage() || |
| GValue->hasAvailableExternallyLinkage() || |
| TM.getCodeModel() == CodeModel::Large) |
| MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); |
| } |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO, |
| OutContext); |
| TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); |
| EmitToStreamer(OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::ADDItocL: { |
| // Transform %Xd = ADDItocL %Xs, <ga:@sym> |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| |
| // Change the opcode to ADDI8. If the global address is external, then |
| // generate a TOC entry and reference that. Otherwise reference the |
| // symbol directly. |
| TmpInst.setOpcode(PPC::ADDI8); |
| const MachineOperand &MO = MI->getOperand(2); |
| assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL"); |
| MCSymbol *MOSymbol = nullptr; |
| bool IsExternal = false; |
| bool IsNonLocalFunction = false; |
| |
| if (MO.isGlobal()) { |
| const GlobalValue *GV = MO.getGlobal(); |
| MOSymbol = getSymbol(GV); |
| IsExternal = GV->isDeclaration(); |
| IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() && |
| (GV->isDeclaration() || GV->isWeakForLinker()); |
| } else if (MO.isCPI()) |
| MOSymbol = GetCPISymbol(MO.getIndex()); |
| |
| if (IsNonLocalFunction || IsExternal || |
| TM.getCodeModel() == CodeModel::Large) |
| MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO, |
| OutContext); |
| TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp); |
| EmitToStreamer(OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::ADDISgotTprelHA: { |
| // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym> |
| // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha |
| assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymGotTprel = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA, |
| OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(PPC::X2) |
| .addExpr(SymGotTprel)); |
| return; |
| } |
| case PPC::LDgotTprelL: |
| case PPC::LDgotTprelL32: { |
| // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| |
| // Change the opcode to LD. |
| TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ); |
| const MachineOperand &MO = MI->getOperand(1); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO, |
| OutContext); |
| TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); |
| EmitToStreamer(OutStreamer, TmpInst); |
| return; |
| } |
| |
| case PPC::PPC32PICGOT: { |
| MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_")); |
| MCSymbol *GOTRef = OutContext.CreateTempSymbol(); |
| MCSymbol *NextInstr = OutContext.CreateTempSymbol(); |
| |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL) |
| // FIXME: We would like an efficient form for this, so we don't have to do |
| // a lot of extra uniquing. |
| .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext))); |
| const MCExpr *OffsExpr = |
| MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext), |
| MCSymbolRefExpr::Create(GOTRef, OutContext), |
| OutContext); |
| OutStreamer.EmitLabel(GOTRef); |
| OutStreamer.EmitValue(OffsExpr, 4); |
| OutStreamer.EmitLabel(NextInstr); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR) |
| .addReg(MI->getOperand(0).getReg())); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ) |
| .addReg(MI->getOperand(1).getReg()) |
| .addImm(0) |
| .addReg(MI->getOperand(0).getReg())); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(1).getReg()) |
| .addReg(MI->getOperand(0).getReg())); |
| return; |
| } |
| case PPC::PPC32GOT: { |
| MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_")); |
| const MCExpr *SymGotTlsL = |
| MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO, |
| OutContext); |
| const MCExpr *SymGotTlsHA = |
| MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA, |
| OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI) |
| .addReg(MI->getOperand(0).getReg()) |
| .addExpr(SymGotTlsL)); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(0).getReg()) |
| .addExpr(SymGotTlsHA)); |
| return; |
| } |
| case PPC::ADDIStlsgdHA: { |
| // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym> |
| // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha |
| assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymGotTlsGD = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA, |
| OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(PPC::X2) |
| .addExpr(SymGotTlsGD)); |
| return; |
| } |
| case PPC::ADDItlsgdL: |
| // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym> |
| // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l |
| case PPC::ADDItlsgdL32: { |
| // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym> |
| // Into: %Rd = ADDI %Rs, sym@got@tlsgd |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymGotTlsGD = |
| MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ? |
| MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO : |
| MCSymbolRefExpr::VK_PPC_GOT_TLSGD, |
| OutContext); |
| EmitToStreamer(OutStreamer, |
| MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(1).getReg()) |
| .addExpr(SymGotTlsGD)); |
| return; |
| } |
| case PPC::ADDIStlsldHA: { |
| // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym> |
| // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha |
| assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymGotTlsLD = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA, |
| OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(PPC::X2) |
| .addExpr(SymGotTlsLD)); |
| return; |
| } |
| case PPC::ADDItlsldL: |
| // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym> |
| // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l |
| case PPC::ADDItlsldL32: { |
| // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym> |
| // Into: %Rd = ADDI %Rs, sym@got@tlsld |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymGotTlsLD = |
| MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ? |
| MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO : |
| MCSymbolRefExpr::VK_PPC_GOT_TLSLD, |
| OutContext); |
| EmitToStreamer(OutStreamer, |
| MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(1).getReg()) |
| .addExpr(SymGotTlsLD)); |
| return; |
| } |
| case PPC::ADDISdtprelHA: |
| // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym> |
| // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha |
| case PPC::ADDISdtprelHA32: { |
| // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym> |
| // Into: %Rd = ADDIS %R3, sym@dtprel@ha |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymDtprel = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA, |
| OutContext); |
| EmitToStreamer(OutStreamer, |
| MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3) |
| .addExpr(SymDtprel)); |
| return; |
| } |
| case PPC::ADDIdtprelL: |
| // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym> |
| // Into: %Xd = ADDI8 %Xs, sym@dtprel@l |
| case PPC::ADDIdtprelL32: { |
| // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym> |
| // Into: %Rd = ADDI %Rs, sym@dtprel@l |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymDtprel = |
| MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO, |
| OutContext); |
| EmitToStreamer(OutStreamer, |
| MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(1).getReg()) |
| .addExpr(SymDtprel)); |
| return; |
| } |
| case PPC::MFOCRF: |
| case PPC::MFOCRF8: |
| if (!Subtarget.hasMFOCRF()) { |
| // Transform: %R3 = MFOCRF %CR7 |
| // Into: %R3 = MFCR ;; cr7 |
| unsigned NewOpcode = |
| MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8; |
| OutStreamer.AddComment(PPCInstPrinter:: |
| getRegisterName(MI->getOperand(1).getReg())); |
| EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode) |
| .addReg(MI->getOperand(0).getReg())); |
| return; |
| } |
| break; |
| case PPC::MTOCRF: |
| case PPC::MTOCRF8: |
| if (!Subtarget.hasMFOCRF()) { |
| // Transform: %CR7 = MTOCRF %R3 |
| // Into: MTCRF mask, %R3 ;; cr7 |
| unsigned NewOpcode = |
| MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8; |
| unsigned Mask = 0x80 >> OutContext.getRegisterInfo() |
| ->getEncodingValue(MI->getOperand(0).getReg()); |
| OutStreamer.AddComment(PPCInstPrinter:: |
| getRegisterName(MI->getOperand(0).getReg())); |
| EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode) |
| .addImm(Mask) |
| .addReg(MI->getOperand(1).getReg())); |
| return; |
| } |
| break; |
| case PPC::LD: |
| case PPC::STD: |
| case PPC::LWA_32: |
| case PPC::LWA: { |
| // Verify alignment is legal, so we don't create relocations |
| // that can't be supported. |
| // FIXME: This test is currently disabled for Darwin. The test |
| // suite shows a handful of test cases that fail this check for |
| // Darwin. Those need to be investigated before this sanity test |
| // can be enabled for those subtargets. |
| if (!Subtarget.isDarwin()) { |
| unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1; |
| const MachineOperand &MO = MI->getOperand(OpNum); |
| if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4) |
| llvm_unreachable("Global must be word-aligned for LD, STD, LWA!"); |
| } |
| // Now process the instruction normally. |
| break; |
| } |
| } |
| |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin); |
| EmitToStreamer(OutStreamer, TmpInst); |
| } |
| |
| void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) { |
| if (Subtarget.isELFv2ABI()) { |
| PPCTargetStreamer *TS = |
| static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer()); |
| |
| if (TS) |
| TS->emitAbiVersion(2); |
| } |
| |
| if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_) |
| return AsmPrinter::EmitStartOfAsmFile(M); |
| |
| if (M.getPICLevel() == PICLevel::Small) |
| return AsmPrinter::EmitStartOfAsmFile(M); |
| |
| OutStreamer.SwitchSection(OutContext.getELFSection(".got2", |
| ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC, |
| SectionKind::getReadOnly())); |
| |
| MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC")); |
| MCSymbol *CurrentPos = OutContext.CreateTempSymbol(); |
| |
| OutStreamer.EmitLabel(CurrentPos); |
| |
| // The GOT pointer points to the middle of the GOT, in order to reference the |
| // entire 64kB range. 0x8000 is the midpoint. |
| const MCExpr *tocExpr = |
| MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext), |
| MCConstantExpr::Create(0x8000, OutContext), |
| OutContext); |
| |
| OutStreamer.EmitAssignment(TOCSym, tocExpr); |
| |
| OutStreamer.SwitchSection(getObjFileLowering().getTextSection()); |
| } |
| |
| void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() { |
| // linux/ppc32 - Normal entry label. |
| if (!Subtarget.isPPC64() && |
| (TM.getRelocationModel() != Reloc::PIC_ || |
| MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small)) |
| return AsmPrinter::EmitFunctionEntryLabel(); |
| |
| if (!Subtarget.isPPC64()) { |
| const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>(); |
| if (PPCFI->usesPICBase()) { |
| MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol(); |
| MCSymbol *PICBase = MF->getPICBaseSymbol(); |
| OutStreamer.EmitLabel(RelocSymbol); |
| |
| const MCExpr *OffsExpr = |
| MCBinaryExpr::CreateSub( |
| MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")), |
| OutContext), |
| MCSymbolRefExpr::Create(PICBase, OutContext), |
| OutContext); |
| OutStreamer.EmitValue(OffsExpr, 4); |
| OutStreamer.EmitLabel(CurrentFnSym); |
| return; |
| } else |
| return AsmPrinter::EmitFunctionEntryLabel(); |
| } |
| |
| // ELFv2 ABI - Normal entry label. |
| if (Subtarget.isELFv2ABI()) |
| return AsmPrinter::EmitFunctionEntryLabel(); |
| |
| // Emit an official procedure descriptor. |
| MCSectionSubPair Current = OutStreamer.getCurrentSection(); |
| const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd", |
| ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC, |
| SectionKind::getReadOnly()); |
| OutStreamer.SwitchSection(Section); |
| OutStreamer.EmitLabel(CurrentFnSym); |
| OutStreamer.EmitValueToAlignment(8); |
| MCSymbol *Symbol1 = |
| OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName())); |
| // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function |
| // entry point. |
| OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext), |
| 8 /*size*/); |
| MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC.")); |
| // Generates a R_PPC64_TOC relocation for TOC base insertion. |
| OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2, |
| MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext), |
| 8/*size*/); |
| // Emit a null environment pointer. |
| OutStreamer.EmitIntValue(0, 8 /* size */); |
| OutStreamer.SwitchSection(Current.first, Current.second); |
| |
| MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol( |
| ".L." + Twine(CurrentFnSym->getName())); |
| OutStreamer.EmitLabel(RealFnSym); |
| CurrentFnSymForSize = RealFnSym; |
| } |
| |
| |
| bool PPCLinuxAsmPrinter::doFinalization(Module &M) { |
| const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout(); |
| |
| bool isPPC64 = TD->getPointerSizeInBits() == 64; |
| |
| PPCTargetStreamer &TS = |
| static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer()); |
| |
| if (!TOC.empty()) { |
| const MCSectionELF *Section; |
| |
| if (isPPC64) |
| Section = OutStreamer.getContext().getELFSection(".toc", |
| ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC, |
| SectionKind::getReadOnly()); |
| else |
| Section = OutStreamer.getContext().getELFSection(".got2", |
| ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC, |
| SectionKind::getReadOnly()); |
| OutStreamer.SwitchSection(Section); |
| |
| for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(), |
| E = TOC.end(); I != E; ++I) { |
| OutStreamer.EmitLabel(I->second); |
| MCSymbol *S = I->first; |
| if (isPPC64) |
| TS.emitTCEntry(*S); |
| else |
| OutStreamer.EmitSymbolValue(S, 4); |
| } |
| } |
| |
| MachineModuleInfoELF &MMIELF = |
| MMI->getObjFileInfo<MachineModuleInfoELF>(); |
| |
| MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList(); |
| if (!Stubs.empty()) { |
| OutStreamer.SwitchSection(getObjFileLowering().getDataSection()); |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| // L_foo$stub: |
| OutStreamer.EmitLabel(Stubs[i].first); |
| // .long _foo |
| OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(), |
| OutContext), |
| isPPC64 ? 8 : 4/*size*/); |
| } |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| return AsmPrinter::doFinalization(M); |
| } |
| |
| /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2. |
| void PPCLinuxAsmPrinter::EmitFunctionBodyStart() { |
| // In the ELFv2 ABI, in functions that use the TOC register, we need to |
| // provide two entry points. The ABI guarantees that when calling the |
| // local entry point, r2 is set up by the caller to contain the TOC base |
| // for this function, and when calling the global entry point, r12 is set |
| // up by the caller to hold the address of the global entry point. We |
| // thus emit a prefix sequence along the following lines: |
| // |
| // func: |
| // # global entry point |
| // addis r2,r12,(.TOC.-func)@ha |
| // addi r2,r2,(.TOC.-func)@l |
| // .localentry func, .-func |
| // # local entry point, followed by function body |
| // |
| // This ensures we have r2 set up correctly while executing the function |
| // body, no matter which entry point is called. |
| if (Subtarget.isELFv2ABI() |
| // Only do all that if the function uses r2 in the first place. |
| && !MF->getRegInfo().use_empty(PPC::X2)) { |
| |
| MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol(); |
| OutStreamer.EmitLabel(GlobalEntryLabel); |
| const MCSymbolRefExpr *GlobalEntryLabelExp = |
| MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext); |
| |
| MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC.")); |
| const MCExpr *TOCDeltaExpr = |
| MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext), |
| GlobalEntryLabelExp, OutContext); |
| |
| const MCExpr *TOCDeltaHi = |
| PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS) |
| .addReg(PPC::X2) |
| .addReg(PPC::X12) |
| .addExpr(TOCDeltaHi)); |
| |
| const MCExpr *TOCDeltaLo = |
| PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI) |
| .addReg(PPC::X2) |
| .addReg(PPC::X2) |
| .addExpr(TOCDeltaLo)); |
| |
| MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol(); |
| OutStreamer.EmitLabel(LocalEntryLabel); |
| const MCSymbolRefExpr *LocalEntryLabelExp = |
| MCSymbolRefExpr::Create(LocalEntryLabel, OutContext); |
| const MCExpr *LocalOffsetExp = |
| MCBinaryExpr::CreateSub(LocalEntryLabelExp, |
| GlobalEntryLabelExp, OutContext); |
| |
| PPCTargetStreamer *TS = |
| static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer()); |
| |
| if (TS) |
| TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp); |
| } |
| } |
| |
| /// EmitFunctionBodyEnd - Print the traceback table before the .size |
| /// directive. |
| /// |
| void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() { |
| // Only the 64-bit target requires a traceback table. For now, |
| // we only emit the word of zeroes that GDB requires to find |
| // the end of the function, and zeroes for the eight-byte |
| // mandatory fields. |
| // FIXME: We should fill in the eight-byte mandatory fields as described in |
| // the PPC64 ELF ABI (this is a low-priority item because GDB does not |
| // currently make use of these fields). |
| if (Subtarget.isPPC64()) { |
| OutStreamer.EmitIntValue(0, 4/*size*/); |
| OutStreamer.EmitIntValue(0, 8/*size*/); |
| } |
| } |
| |
| void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) { |
| static const char *const CPUDirectives[] = { |
| "", |
| "ppc", |
| "ppc440", |
| "ppc601", |
| "ppc602", |
| "ppc603", |
| "ppc7400", |
| "ppc750", |
| "ppc970", |
| "ppcA2", |
| "ppce500mc", |
| "ppce5500", |
| "power3", |
| "power4", |
| "power5", |
| "power5x", |
| "power6", |
| "power6x", |
| "power7", |
| "ppc64", |
| "ppc64le" |
| }; |
| |
| unsigned Directive = Subtarget.getDarwinDirective(); |
| if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970) |
| Directive = PPC::DIR_970; |
| if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400) |
| Directive = PPC::DIR_7400; |
| if (Subtarget.isPPC64() && Directive < PPC::DIR_64) |
| Directive = PPC::DIR_64; |
| assert(Directive <= PPC::DIR_64 && "Directive out of range."); |
| |
| assert(Directive < array_lengthof(CPUDirectives) && |
| "CPUDirectives[] might not be up-to-date!"); |
| PPCTargetStreamer &TStreamer = |
| *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer()); |
| TStreamer.emitMachine(CPUDirectives[Directive]); |
| |
| // Prime text sections so they are adjacent. This reduces the likelihood a |
| // large data or debug section causes a branch to exceed 16M limit. |
| const TargetLoweringObjectFileMachO &TLOFMacho = |
| static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); |
| OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection()); |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| OutStreamer.SwitchSection( |
| OutContext.getMachOSection("__TEXT", "__picsymbolstub1", |
| MachO::S_SYMBOL_STUBS | |
| MachO::S_ATTR_PURE_INSTRUCTIONS, |
| 32, SectionKind::getText())); |
| } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) { |
| OutStreamer.SwitchSection( |
| OutContext.getMachOSection("__TEXT","__symbol_stub1", |
| MachO::S_SYMBOL_STUBS | |
| MachO::S_ATTR_PURE_INSTRUCTIONS, |
| 16, SectionKind::getText())); |
| } |
| OutStreamer.SwitchSection(getObjFileLowering().getTextSection()); |
| } |
| |
| static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) { |
| // Remove $stub suffix, add $lazy_ptr. |
| StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5); |
| return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr"); |
| } |
| |
| static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) { |
| // Add $tmp suffix to $stub, yielding $stub$tmp. |
| return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp"); |
| } |
| |
| void PPCDarwinAsmPrinter:: |
| EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) { |
| bool isPPC64 = |
| TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64; |
| bool isDarwin = Subtarget.isDarwin(); |
| |
| const TargetLoweringObjectFileMachO &TLOFMacho = |
| static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); |
| |
| // .lazy_symbol_pointer |
| const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection(); |
| |
| // Output stubs for dynamically-linked functions |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| const MCSection *StubSection = |
| OutContext.getMachOSection("__TEXT", "__picsymbolstub1", |
| MachO::S_SYMBOL_STUBS | |
| MachO::S_ATTR_PURE_INSTRUCTIONS, |
| 32, SectionKind::getText()); |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| OutStreamer.SwitchSection(StubSection); |
| EmitAlignment(4); |
| |
| MCSymbol *Stub = Stubs[i].first; |
| MCSymbol *RawSym = Stubs[i].second.getPointer(); |
| MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext); |
| MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext); |
| |
| OutStreamer.EmitLabel(Stub); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| |
| const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext); |
| const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext); |
| const MCExpr *Sub = |
| MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext); |
| |
| // mflr r0 |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0)); |
| // bcl 20, 31, AnonSymbol |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon)); |
| OutStreamer.EmitLabel(AnonSymbol); |
| // mflr r11 |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11)); |
| // addis r11, r11, ha16(LazyPtr - AnonSymbol) |
| const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS) |
| .addReg(PPC::R11) |
| .addReg(PPC::R11) |
| .addExpr(SubHa16)); |
| // mtlr r0 |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0)); |
| |
| // ldu r12, lo16(LazyPtr - AnonSymbol)(r11) |
| // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11) |
| const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU) |
| .addReg(PPC::R12) |
| .addExpr(SubLo16).addExpr(SubLo16) |
| .addReg(PPC::R11)); |
| // mtctr r12 |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12)); |
| // bctr |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR)); |
| |
| OutStreamer.SwitchSection(LSPSection); |
| OutStreamer.EmitLabel(LazyPtr); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| |
| MCSymbol *DyldStubBindingHelper = |
| OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper")); |
| if (isPPC64) { |
| // .quad dyld_stub_binding_helper |
| OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8); |
| } else { |
| // .long dyld_stub_binding_helper |
| OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4); |
| } |
| } |
| OutStreamer.AddBlankLine(); |
| return; |
| } |
| |
| const MCSection *StubSection = |
| OutContext.getMachOSection("__TEXT","__symbol_stub1", |
| MachO::S_SYMBOL_STUBS | |
| MachO::S_ATTR_PURE_INSTRUCTIONS, |
| 16, SectionKind::getText()); |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| MCSymbol *Stub = Stubs[i].first; |
| MCSymbol *RawSym = Stubs[i].second.getPointer(); |
| MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext); |
| const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext); |
| |
| OutStreamer.SwitchSection(StubSection); |
| EmitAlignment(4); |
| OutStreamer.EmitLabel(Stub); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| |
| // lis r11, ha16(LazyPtr) |
| const MCExpr *LazyPtrHa16 = |
| PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS) |
| .addReg(PPC::R11) |
| .addExpr(LazyPtrHa16)); |
| |
| // ldu r12, lo16(LazyPtr)(r11) |
| // lwzu r12, lo16(LazyPtr)(r11) |
| const MCExpr *LazyPtrLo16 = |
| PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext); |
| EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU) |
| .addReg(PPC::R12) |
| .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16) |
| .addReg(PPC::R11)); |
| |
| // mtctr r12 |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12)); |
| // bctr |
| EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR)); |
| |
| OutStreamer.SwitchSection(LSPSection); |
| OutStreamer.EmitLabel(LazyPtr); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| |
| MCSymbol *DyldStubBindingHelper = |
| OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper")); |
| if (isPPC64) { |
| // .quad dyld_stub_binding_helper |
| OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8); |
| } else { |
| // .long dyld_stub_binding_helper |
| OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4); |
| } |
| } |
| |
| OutStreamer.AddBlankLine(); |
| } |
| |
| |
| bool PPCDarwinAsmPrinter::doFinalization(Module &M) { |
| bool isPPC64 = |
| TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64; |
| |
| // Darwin/PPC always uses mach-o. |
| const TargetLoweringObjectFileMachO &TLOFMacho = |
| static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); |
| MachineModuleInfoMachO &MMIMacho = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>(); |
| |
| MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList(); |
| if (!Stubs.empty()) |
| EmitFunctionStubs(Stubs); |
| |
| if (MAI->doesSupportExceptionHandling() && MMI) { |
| // Add the (possibly multiple) personalities to the set of global values. |
| // Only referenced functions get into the Personalities list. |
| const std::vector<const Function*> &Personalities = MMI->getPersonalities(); |
| for (std::vector<const Function*>::const_iterator I = Personalities.begin(), |
| E = Personalities.end(); I != E; ++I) { |
| if (*I) { |
| MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| MMIMacho.getGVStubEntry(NLPSym); |
| StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true); |
| } |
| } |
| } |
| |
| // Output stubs for dynamically-linked functions. |
| Stubs = MMIMacho.GetGVStubList(); |
| |
| // Output macho stubs for external and common global variables. |
| if (!Stubs.empty()) { |
| // Switch with ".non_lazy_symbol_pointer" directive. |
| OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection()); |
| EmitAlignment(isPPC64 ? 3 : 2); |
| |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| // L_foo$stub: |
| OutStreamer.EmitLabel(Stubs[i].first); |
| // .indirect_symbol _foo |
| MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second; |
| OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol); |
| |
| if (MCSym.getInt()) |
| // External to current translation unit. |
| OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/); |
| else |
| // Internal to current translation unit. |
| // |
| // When we place the LSDA into the TEXT section, the type info pointers |
| // need to be indirect and pc-rel. We accomplish this by using NLPs. |
| // However, sometimes the types are local to the file. So we need to |
| // fill in the value for the NLP in those cases. |
| OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(), |
| OutContext), |
| isPPC64 ? 8 : 4/*size*/); |
| } |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| Stubs = MMIMacho.GetHiddenGVStubList(); |
| if (!Stubs.empty()) { |
| OutStreamer.SwitchSection(getObjFileLowering().getDataSection()); |
| EmitAlignment(isPPC64 ? 3 : 2); |
| |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| // L_foo$stub: |
| OutStreamer.EmitLabel(Stubs[i].first); |
| // .long _foo |
| OutStreamer.EmitValue(MCSymbolRefExpr:: |
| Create(Stubs[i].second.getPointer(), |
| OutContext), |
| isPPC64 ? 8 : 4/*size*/); |
| } |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| // Funny Darwin hack: This flag tells the linker that no global symbols |
| // contain code that falls through to other global symbols (e.g. the obvious |
| // implementation of multiple entry points). If this doesn't occur, the |
| // linker can safely perform dead code stripping. Since LLVM never generates |
| // code that does this, it is always safe to set. |
| OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols); |
| |
| return AsmPrinter::doFinalization(M); |
| } |
| |
| /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code |
| /// for a MachineFunction to the given output stream, in a format that the |
| /// Darwin assembler can deal with. |
| /// |
| static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm, |
| MCStreamer &Streamer) { |
| const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>(); |
| |
| if (Subtarget->isDarwin()) |
| return new PPCDarwinAsmPrinter(tm, Streamer); |
| return new PPCLinuxAsmPrinter(tm, Streamer); |
| } |
| |
| // Force static initialization. |
| extern "C" void LLVMInitializePowerPCAsmPrinter() { |
| TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass); |
| TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass); |
| TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass); |
| } |
