| //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===// |
| // |
| // 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 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 "MCTargetDesc/PPCInstPrinter.h" |
| #include "MCTargetDesc/PPCMCExpr.h" |
| #include "MCTargetDesc/PPCMCTargetDesc.h" |
| #include "MCTargetDesc/PPCPredicates.h" |
| #include "PPC.h" |
| #include "PPCInstrInfo.h" |
| #include "PPCMachineFunctionInfo.h" |
| #include "PPCSubtarget.h" |
| #include "PPCTargetMachine.h" |
| #include "PPCTargetStreamer.h" |
| #include "TargetInfo/PowerPCTargetInfo.h" |
| #include "llvm/ADT/MapVector.h" |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/ADT/Twine.h" |
| #include "llvm/BinaryFormat/ELF.h" |
| #include "llvm/BinaryFormat/MachO.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/CodeGen/MachineBasicBlock.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/CodeGen/MachineModuleInfoImpls.h" |
| #include "llvm/CodeGen/MachineOperand.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/CodeGen/StackMaps.h" |
| #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" |
| #include "llvm/IR/DataLayout.h" |
| #include "llvm/IR/GlobalValue.h" |
| #include "llvm/IR/GlobalVariable.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/MCSectionXCOFF.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/MC/MCSymbolELF.h" |
| #include "llvm/MC/MCSymbolXCOFF.h" |
| #include "llvm/MC/SectionKind.h" |
| #include "llvm/Support/Casting.h" |
| #include "llvm/Support/CodeGen.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/TargetRegistry.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/Target/TargetMachine.h" |
| #include <algorithm> |
| #include <cassert> |
| #include <cstdint> |
| #include <memory> |
| #include <new> |
| |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "asmprinter" |
| |
| namespace { |
| |
| class PPCAsmPrinter : public AsmPrinter { |
| protected: |
| MapVector<const MCSymbol *, MCSymbol *> TOC; |
| const PPCSubtarget *Subtarget = nullptr; |
| StackMaps SM; |
| |
| virtual MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO); |
| |
| public: |
| explicit PPCAsmPrinter(TargetMachine &TM, |
| std::unique_ptr<MCStreamer> Streamer) |
| : AsmPrinter(TM, std::move(Streamer)), SM(*this) {} |
| |
| StringRef getPassName() const override { return "PowerPC Assembly Printer"; } |
| |
| MCSymbol *lookUpOrCreateTOCEntry(const MCSymbol *Sym); |
| |
| bool doInitialization(Module &M) override { |
| if (!TOC.empty()) |
| TOC.clear(); |
| return AsmPrinter::doInitialization(M); |
| } |
| |
| void EmitInstruction(const MachineInstr *MI) override; |
| |
| /// This function is for PrintAsmOperand and PrintAsmMemoryOperand, |
| /// invoked by EmitMSInlineAsmStr and EmitGCCInlineAsmStr only. |
| /// The \p MI would be INLINEASM ONLY. |
| void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O); |
| |
| void PrintSymbolOperand(const MachineOperand &MO, raw_ostream &O) override; |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| const char *ExtraCode, raw_ostream &O) override; |
| bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| const char *ExtraCode, raw_ostream &O) override; |
| |
| void EmitEndOfAsmFile(Module &M) override; |
| |
| void LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI); |
| void LowerPATCHPOINT(StackMaps &SM, const MachineInstr &MI); |
| void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK); |
| bool runOnMachineFunction(MachineFunction &MF) override { |
| Subtarget = &MF.getSubtarget<PPCSubtarget>(); |
| bool Changed = AsmPrinter::runOnMachineFunction(MF); |
| emitXRayTable(); |
| return Changed; |
| } |
| }; |
| |
| /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux |
| class PPCLinuxAsmPrinter : public PPCAsmPrinter { |
| public: |
| explicit PPCLinuxAsmPrinter(TargetMachine &TM, |
| std::unique_ptr<MCStreamer> Streamer) |
| : PPCAsmPrinter(TM, std::move(Streamer)) {} |
| |
| StringRef 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; |
| void EmitInstruction(const MachineInstr *MI) override; |
| }; |
| |
| class PPCAIXAsmPrinter : public PPCAsmPrinter { |
| private: |
| static void ValidateGV(const GlobalVariable *GV); |
| protected: |
| MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO) override; |
| |
| public: |
| PPCAIXAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer) |
| : PPCAsmPrinter(TM, std::move(Streamer)) {} |
| |
| StringRef getPassName() const override { return "AIX PPC Assembly Printer"; } |
| |
| void SetupMachineFunction(MachineFunction &MF) override; |
| |
| const MCExpr *lowerConstant(const Constant *CV) override; |
| |
| void EmitGlobalVariable(const GlobalVariable *GV) override; |
| |
| void EmitFunctionDescriptor() override; |
| |
| void EmitEndOfAsmFile(Module &) override; |
| }; |
| |
| } // end anonymous namespace |
| |
| void PPCAsmPrinter::PrintSymbolOperand(const MachineOperand &MO, |
| raw_ostream &O) { |
| // 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 (Subtarget->hasLazyResolverStub(GV)) { |
| 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 { |
| SymToPrint = getSymbol(GV); |
| } |
| |
| SymToPrint->print(O, MAI); |
| |
| printOffset(MO.getOffset(), O); |
| } |
| |
| void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo, |
| raw_ostream &O) { |
| const DataLayout &DL = getDataLayout(); |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| |
| switch (MO.getType()) { |
| case MachineOperand::MO_Register: { |
| // The MI is INLINEASM ONLY and UseVSXReg is always false. |
| 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 = PPCRegisterInfo::stripRegisterPrefix(RegName); |
| O << RegName; |
| return; |
| } |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| return; |
| |
| case MachineOperand::MO_MachineBasicBlock: |
| MO.getMBB()->getSymbol()->print(O, MAI); |
| return; |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' |
| << MO.getIndex(); |
| return; |
| case MachineOperand::MO_BlockAddress: |
| GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI); |
| return; |
| case MachineOperand::MO_GlobalAddress: { |
| PrintSymbolOperand(MO, 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, |
| 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, ExtraCode, O); |
| 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; |
| case 'x': |
| if(!MI->getOperand(OpNo).isReg()) |
| return true; |
| // This operand uses VSX numbering. |
| // If the operand is a VMX register, convert it to a VSX register. |
| Register Reg = MI->getOperand(OpNo).getReg(); |
| if (PPCInstrInfo::isVRRegister(Reg)) |
| Reg = PPC::VSX32 + (Reg - PPC::V0); |
| else if (PPCInstrInfo::isVFRegister(Reg)) |
| Reg = PPC::VSX32 + (Reg - PPC::VF0); |
| const char *RegName; |
| RegName = PPCInstPrinter::getRegisterName(Reg); |
| RegName = PPCRegisterInfo::stripRegisterPrefix(RegName); |
| O << RegName; |
| 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, |
| 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 = PPCRegisterInfo::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(const MCSymbol *Sym) { |
| MCSymbol *&TOCEntry = TOC[Sym]; |
| if (!TOCEntry) |
| TOCEntry = createTempSymbol("C"); |
| return TOCEntry; |
| } |
| |
| void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) { |
| emitStackMaps(SM); |
| } |
| |
| void PPCAsmPrinter::LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI) { |
| unsigned NumNOPBytes = MI.getOperand(1).getImm(); |
| |
| auto &Ctx = OutStreamer->getContext(); |
| MCSymbol *MILabel = Ctx.createTempSymbol(); |
| OutStreamer->EmitLabel(MILabel); |
| |
| SM.recordStackMap(*MILabel, 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(StackMaps &SM, const MachineInstr &MI) { |
| auto &Ctx = OutStreamer->getContext(); |
| MCSymbol *MILabel = Ctx.createTempSymbol(); |
| OutStreamer->EmitLabel(MILabel); |
| |
| SM.recordPatchPoint(*MILabel, MI); |
| PatchPointOpers Opers(&MI); |
| |
| unsigned EncodedBytes = 0; |
| const MachineOperand &CalleeMO = Opers.getCallTarget(); |
| |
| if (CalleeMO.isImm()) { |
| int64_t CallTarget = CalleeMO.getImm(); |
| if (CallTarget) { |
| assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget && |
| "High 16 bits of call target should be zero."); |
| Register ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg(); |
| EncodedBytes = 0; |
| // Materialize the jump address: |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI8) |
| .addReg(ScratchReg) |
| .addImm((CallTarget >> 32) & 0xFFFF)); |
| ++EncodedBytes; |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::RLDIC) |
| .addReg(ScratchReg) |
| .addReg(ScratchReg) |
| .addImm(32).addImm(16)); |
| ++EncodedBytes; |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORIS8) |
| .addReg(ScratchReg) |
| .addReg(ScratchReg) |
| .addImm((CallTarget >> 16) & 0xFFFF)); |
| ++EncodedBytes; |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORI8) |
| .addReg(ScratchReg) |
| .addReg(ScratchReg) |
| .addImm(CallTarget & 0xFFFF)); |
| |
| // Save the current TOC pointer before the remote call. |
| int TOCSaveOffset = Subtarget->getFrameLowering()->getTOCSaveOffset(); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::STD) |
| .addReg(PPC::X2) |
| .addImm(TOCSaveOffset) |
| .addReg(PPC::X1)); |
| ++EncodedBytes; |
| |
| // If we're on ELFv1, then we need to load the actual function pointer |
| // from the function descriptor. |
| if (!Subtarget->isELFv2ABI()) { |
| // Load the new TOC pointer and the function address, but not r11 |
| // (needing this is rare, and loading it here would prevent passing it |
| // via a 'nest' parameter. |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD) |
| .addReg(PPC::X2) |
| .addImm(8) |
| .addReg(ScratchReg)); |
| ++EncodedBytes; |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD) |
| .addReg(ScratchReg) |
| .addImm(0) |
| .addReg(ScratchReg)); |
| ++EncodedBytes; |
| } |
| |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR8) |
| .addReg(ScratchReg)); |
| ++EncodedBytes; |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTRL8)); |
| ++EncodedBytes; |
| |
| // Restore the TOC pointer after the call. |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD) |
| .addReg(PPC::X2) |
| .addImm(TOCSaveOffset) |
| .addReg(PPC::X1)); |
| ++EncodedBytes; |
| } |
| } else if (CalleeMO.isGlobal()) { |
| const GlobalValue *GValue = CalleeMO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, OutContext); |
| |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL8_NOP) |
| .addExpr(SymVar)); |
| EncodedBytes += 2; |
| } |
| |
| // Each instruction is 4 bytes. |
| EncodedBytes *= 4; |
| |
| // Emit padding. |
| unsigned NumBytes = Opers.getNumPatchBytes(); |
| 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)); |
| } |
| |
| /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a |
| /// call to __tls_get_addr to the current output stream. |
| void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI, |
| MCSymbolRefExpr::VariantKind VK) { |
| StringRef Name = "__tls_get_addr"; |
| MCSymbol *TlsGetAddr = OutContext.getOrCreateSymbol(Name); |
| MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None; |
| const Module *M = MF->getFunction().getParent(); |
| |
| assert(MI->getOperand(0).isReg() && |
| ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) || |
| (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) && |
| "GETtls[ld]ADDR[32] must define GPR3"); |
| assert(MI->getOperand(1).isReg() && |
| ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) || |
| (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) && |
| "GETtls[ld]ADDR[32] must read GPR3"); |
| |
| if (Subtarget->is32BitELFABI() && isPositionIndependent()) |
| Kind = MCSymbolRefExpr::VK_PLT; |
| |
| const MCExpr *TlsRef = |
| MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext); |
| |
| // Add 32768 offset to the symbol so we follow up the latest GOT/PLT ABI. |
| if (Kind == MCSymbolRefExpr::VK_PLT && Subtarget->isSecurePlt() && |
| M->getPICLevel() == PICLevel::BigPIC) |
| TlsRef = MCBinaryExpr::createAdd( |
| TlsRef, MCConstantExpr::create(32768, OutContext), OutContext); |
| const MachineOperand &MO = MI->getOperand(2); |
| const GlobalValue *GValue = MO.getGlobal(); |
| MCSymbol *MOSymbol = getSymbol(GValue); |
| const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, VK, OutContext); |
| EmitToStreamer(*OutStreamer, |
| MCInstBuilder(Subtarget->isPPC64() ? |
| PPC::BL8_NOP_TLS : PPC::BL_TLS) |
| .addExpr(TlsRef) |
| .addExpr(SymVar)); |
| } |
| |
| /// Map a machine operand for a TOC pseudo-machine instruction to its |
| /// corresponding MCSymbol. |
| MCSymbol *PPCAsmPrinter::getMCSymbolForTOCPseudoMO(const MachineOperand &MO) { |
| switch (MO.getType()) { |
| case MachineOperand::MO_GlobalAddress: |
| return getSymbol(MO.getGlobal()); |
| case MachineOperand::MO_ConstantPoolIndex: |
| return GetCPISymbol(MO.getIndex()); |
| case MachineOperand::MO_JumpTableIndex: |
| return GetJTISymbol(MO.getIndex()); |
| case MachineOperand::MO_BlockAddress: |
| return GetBlockAddressSymbol(MO.getBlockAddress()); |
| default: |
| llvm_unreachable("Unexpected operand type to get symbol."); |
| } |
| } |
| |
| /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to |
| /// the current output stream. |
| /// |
| void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) { |
| MCInst TmpInst; |
| const bool IsDarwin = TM.getTargetTriple().isOSDarwin(); |
| const bool IsPPC64 = Subtarget->isPPC64(); |
| const bool IsAIX = Subtarget->isAIXABI(); |
| const Module *M = MF->getFunction().getParent(); |
| PICLevel::Level PL = M->getPICLevel(); |
| |
| #ifndef NDEBUG |
| // Validate that SPE and FPU are mutually exclusive in codegen |
| if (!MI->isInlineAsm()) { |
| for (const MachineOperand &MO: MI->operands()) { |
| if (MO.isReg()) { |
| Register Reg = MO.getReg(); |
| if (Subtarget->hasSPE()) { |
| if (PPC::F4RCRegClass.contains(Reg) || |
| PPC::F8RCRegClass.contains(Reg) || |
| PPC::QBRCRegClass.contains(Reg) || |
| PPC::QFRCRegClass.contains(Reg) || |
| PPC::QSRCRegClass.contains(Reg) || |
| PPC::VFRCRegClass.contains(Reg) || |
| PPC::VRRCRegClass.contains(Reg) || |
| PPC::VSFRCRegClass.contains(Reg) || |
| PPC::VSSRCRegClass.contains(Reg) |
| ) |
| llvm_unreachable("SPE targets cannot have FPRegs!"); |
| } else { |
| if (PPC::SPERCRegClass.contains(Reg)) |
| llvm_unreachable("SPE register found in FPU-targeted code!"); |
| } |
| } |
| } |
| } |
| #endif |
| // 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(SM, *MI); |
| case TargetOpcode::PATCHPOINT: |
| return LowerPATCHPOINT(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$pb(%ri) |
| // add %rd, %rt, %ri |
| // or into (if secure plt mode is on): |
| // addis r30, r30, {.LTOC,_GLOBAL_OFFSET_TABLE} - .L0$pb@ha |
| // addi r30, r30, {.LTOC,_GLOBAL_OFFSET_TABLE} - .L0$pb@l |
| // Get the offset from the GOT Base Register to the GOT |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin); |
| if (Subtarget->isSecurePlt() && isPositionIndependent() ) { |
| unsigned PICR = TmpInst.getOperand(0).getReg(); |
| MCSymbol *BaseSymbol = OutContext.getOrCreateSymbol( |
| M->getPICLevel() == PICLevel::SmallPIC ? "_GLOBAL_OFFSET_TABLE_" |
| : ".LTOC"); |
| const MCExpr *PB = |
| MCSymbolRefExpr::create(MF->getPICBaseSymbol(), OutContext); |
| |
| const MCExpr *DeltaExpr = MCBinaryExpr::createSub( |
| MCSymbolRefExpr::create(BaseSymbol, OutContext), PB, OutContext); |
| |
| const MCExpr *DeltaHi = PPCMCExpr::createHa(DeltaExpr, false, OutContext); |
| EmitToStreamer( |
| *OutStreamer, |
| MCInstBuilder(PPC::ADDIS).addReg(PICR).addReg(PICR).addExpr(DeltaHi)); |
| |
| const MCExpr *DeltaLo = PPCMCExpr::createLo(DeltaExpr, false, OutContext); |
| EmitToStreamer( |
| *OutStreamer, |
| MCInstBuilder(PPC::ADDI).addReg(PICR).addReg(PICR).addExpr(DeltaLo)); |
| return; |
| } else { |
| MCSymbol *PICOffset = |
| MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol(); |
| TmpInst.setOpcode(PPC::LWZ); |
| const MCExpr *Exp = |
| MCSymbolRefExpr::create(PICOffset, MCSymbolRefExpr::VK_None, OutContext); |
| const MCExpr *PB = |
| MCSymbolRefExpr::create(MF->getPICBaseSymbol(), |
| MCSymbolRefExpr::VK_None, |
| OutContext); |
| const MCOperand TR = TmpInst.getOperand(1); |
| const MCOperand PICR = TmpInst.getOperand(0); |
| |
| // Step 1: lwz %rt, .L$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: { |
| assert(!IsDarwin && "TOC is an ELF/XCOFF construct."); |
| |
| // Transform %rN = LWZtoc @op1, %r2 |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin); |
| |
| // Change the opcode to LWZ. |
| TmpInst.setOpcode(PPC::LWZ); |
| |
| const MachineOperand &MO = MI->getOperand(1); |
| assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) && |
| "Invalid operand for LWZtoc."); |
| |
| // Map the operand to its corresponding MCSymbol. |
| const MCSymbol *const MOSymbol = getMCSymbolForTOCPseudoMO(MO); |
| |
| // Create a reference to the GOT entry for the symbol. The GOT entry will be |
| // synthesized later. |
| if (PL == PICLevel::SmallPIC && !IsAIX) { |
| const MCExpr *Exp = |
| MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_GOT, |
| OutContext); |
| TmpInst.getOperand(1) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| |
| // Otherwise, use the TOC. 'TOCEntry' is a label used to reference the |
| // storage allocated in the TOC which contains the address of |
| // 'MOSymbol'. Said TOC entry will be synthesized later. |
| MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol); |
| const MCExpr *Exp = |
| MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_None, OutContext); |
| |
| // AIX uses the label directly as the lwz displacement operand for |
| // references into the toc section. The displacement value will be generated |
| // relative to the toc-base. |
| if (IsAIX) { |
| assert( |
| TM.getCodeModel() == CodeModel::Small && |
| "This pseudo should only be selected for 32-bit small code model."); |
| TmpInst.getOperand(1) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| |
| // Create an explicit subtract expression between the local symbol and |
| // '.LTOC' to manifest the toc-relative offset. |
| 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: { |
| assert(!IsDarwin && "TOC is an ELF/XCOFF construct"); |
| |
| // Transform %x3 = LDtoc @min1, %x2 |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin); |
| |
| // Change the opcode to LD. |
| TmpInst.setOpcode(PPC::LD); |
| |
| const MachineOperand &MO = MI->getOperand(1); |
| assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) && |
| "Invalid operand!"); |
| |
| // Map the machine operand to its corresponding MCSymbol, then map the |
| // global address operand to be a reference to the TOC entry we will |
| // synthesize later. |
| MCSymbol *TOCEntry = |
| lookUpOrCreateTOCEntry(getMCSymbolForTOCPseudoMO(MO)); |
| |
| const MCSymbolRefExpr::VariantKind VK = |
| IsAIX ? MCSymbolRefExpr::VK_None : MCSymbolRefExpr::VK_PPC_TOC; |
| const MCExpr *Exp = |
| MCSymbolRefExpr::create(TOCEntry, VK, OutContext); |
| TmpInst.getOperand(1) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::ADDIStocHA: { |
| assert((IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large) && |
| "This pseudo should only be selected for 32-bit large code model on" |
| " AIX."); |
| |
| // Transform %rd = ADDIStocHA %rA, @sym(%r2) |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin); |
| |
| // Change the opcode to ADDIS. |
| TmpInst.setOpcode(PPC::ADDIS); |
| |
| const MachineOperand &MO = MI->getOperand(2); |
| assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) && |
| "Invalid operand for ADDIStocHA."); |
| |
| // Map the machine operand to its corresponding MCSymbol. |
| MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO); |
| |
| // Always use TOC on AIX. Map the global address operand to be a reference |
| // to the TOC entry we will synthesize later. 'TOCEntry' is a label used to |
| // reference the storage allocated in the TOC which contains the address of |
| // 'MOSymbol'. |
| MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol); |
| const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry, |
| MCSymbolRefExpr::VK_PPC_U, |
| OutContext); |
| TmpInst.getOperand(2) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::LWZtocL: { |
| assert(IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large && |
| "This pseudo should only be selected for 32-bit large code model on" |
| " AIX."); |
| |
| // Transform %rd = LWZtocL @sym, %rs. |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin); |
| |
| // Change the opcode to lwz. |
| TmpInst.setOpcode(PPC::LWZ); |
| |
| const MachineOperand &MO = MI->getOperand(1); |
| assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) && |
| "Invalid operand for LWZtocL."); |
| |
| // Map the machine operand to its corresponding MCSymbol. |
| MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO); |
| |
| // Always use TOC on AIX. Map the global address operand to be a reference |
| // to the TOC entry we will synthesize later. 'TOCEntry' is a label used to |
| // reference the storage allocated in the TOC which contains the address of |
| // 'MOSymbol'. |
| MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol); |
| const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry, |
| MCSymbolRefExpr::VK_PPC_L, |
| OutContext); |
| TmpInst.getOperand(1) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::ADDIStocHA8: { |
| assert(!IsDarwin && "TOC is an ELF/XCOFF construct"); |
| |
| // Transform %xd = ADDIStocHA8 %x2, @sym |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin); |
| |
| // Change the opcode to ADDIS8. If the global address is the address of |
| // an external symbol, is a jump table address, is a block address, or is a |
| // constant pool index with large code model enabled, 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 ADDIStocHA8!"); |
| |
| const MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO); |
| |
| const bool GlobalToc = |
| MO.isGlobal() && Subtarget->isGVIndirectSymbol(MO.getGlobal()); |
| if (GlobalToc || MO.isJTI() || MO.isBlockAddress() || |
| (MO.isCPI() && TM.getCodeModel() == CodeModel::Large)) |
| MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); |
| |
| const MCSymbolRefExpr::VariantKind VK = |
| IsAIX ? MCSymbolRefExpr::VK_PPC_U : MCSymbolRefExpr::VK_PPC_TOC_HA; |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::create(MOSymbol, VK, OutContext); |
| |
| if (!MO.isJTI() && MO.getOffset()) |
| Exp = MCBinaryExpr::createAdd(Exp, |
| MCConstantExpr::create(MO.getOffset(), |
| OutContext), |
| OutContext); |
| |
| TmpInst.getOperand(2) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::LDtocL: { |
| assert(!IsDarwin && "TOC is an ELF/XCOFF construct"); |
| |
| // Transform %xd = LDtocL @sym, %xs |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin); |
| |
| // Change the opcode to LD. If the global address is the address of |
| // an external symbol, is a jump table address, is a block address, or is |
| // a constant pool index with large code model enabled, then generate a |
| // TOC entry and reference that. 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!"); |
| |
| LLVM_DEBUG(assert( |
| (!MO.isGlobal() || Subtarget->isGVIndirectSymbol(MO.getGlobal())) && |
| "LDtocL used on symbol that could be accessed directly is " |
| "invalid. Must match ADDIStocHA8.")); |
| |
| const MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO); |
| |
| if (!MO.isCPI() || TM.getCodeModel() == CodeModel::Large) |
| MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); |
| |
| const MCSymbolRefExpr::VariantKind VK = |
| IsAIX ? MCSymbolRefExpr::VK_PPC_L : MCSymbolRefExpr::VK_PPC_TOC_LO; |
| const MCExpr *Exp = |
| MCSymbolRefExpr::create(MOSymbol, VK, OutContext); |
| TmpInst.getOperand(1) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::ADDItocL: { |
| // Transform %xd = ADDItocL %xs, @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."); |
| |
| LLVM_DEBUG(assert( |
| !(MO.isGlobal() && Subtarget->isGVIndirectSymbol(MO.getGlobal())) && |
| "Interposable definitions must use indirect access.")); |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::create(getMCSymbolForTOCPseudoMO(MO), |
| MCSymbolRefExpr::VK_PPC_TOC_LO, OutContext); |
| TmpInst.getOperand(2) = MCOperand::createExpr(Exp); |
| EmitToStreamer(*OutStreamer, TmpInst); |
| return; |
| } |
| case PPC::ADDISgotTprelHA: { |
| // Transform: %xd = ADDISgotTprelHA %x2, @sym |
| // Into: %xd = ADDIS8 %x2, sym@got@tlsgd@ha |
| assert(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(MI->getOperand(1).getReg()) |
| .addExpr(SymGotTprel)); |
| return; |
| } |
| case PPC::LDgotTprelL: |
| case PPC::LDgotTprelL32: { |
| // Transform %xd = LDgotTprelL @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, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO |
| : MCSymbolRefExpr::VK_PPC_GOT_TPREL, |
| 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, @sym |
| // Into: %xd = ADDIS8 %x2, sym@got@tlsgd@ha |
| assert(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(MI->getOperand(1).getReg()) |
| .addExpr(SymGotTlsGD)); |
| return; |
| } |
| case PPC::ADDItlsgdL: |
| // Transform: %xd = ADDItlsgdL %xs, @sym |
| // Into: %xd = ADDI8 %xs, sym@got@tlsgd@l |
| case PPC::ADDItlsgdL32: { |
| // Transform: %rd = ADDItlsgdL32 %rs, @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, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO |
| : MCSymbolRefExpr::VK_PPC_GOT_TLSGD, |
| OutContext); |
| EmitToStreamer(*OutStreamer, |
| MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(1).getReg()) |
| .addExpr(SymGotTlsGD)); |
| return; |
| } |
| case PPC::GETtlsADDR: |
| // Transform: %x3 = GETtlsADDR %x3, @sym |
| // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd) |
| case PPC::GETtlsADDR32: { |
| // Transform: %r3 = GETtlsADDR32 %r3, @sym |
| // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT |
| EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD); |
| return; |
| } |
| case PPC::ADDIStlsldHA: { |
| // Transform: %xd = ADDIStlsldHA %x2, @sym |
| // Into: %xd = ADDIS8 %x2, sym@got@tlsld@ha |
| assert(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(MI->getOperand(1).getReg()) |
| .addExpr(SymGotTlsLD)); |
| return; |
| } |
| case PPC::ADDItlsldL: |
| // Transform: %xd = ADDItlsldL %xs, @sym |
| // Into: %xd = ADDI8 %xs, sym@got@tlsld@l |
| case PPC::ADDItlsldL32: { |
| // Transform: %rd = ADDItlsldL32 %rs, @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, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO |
| : MCSymbolRefExpr::VK_PPC_GOT_TLSLD, |
| OutContext); |
| EmitToStreamer(*OutStreamer, |
| MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(1).getReg()) |
| .addExpr(SymGotTlsLD)); |
| return; |
| } |
| case PPC::GETtlsldADDR: |
| // Transform: %x3 = GETtlsldADDR %x3, @sym |
| // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld) |
| case PPC::GETtlsldADDR32: { |
| // Transform: %r3 = GETtlsldADDR32 %r3, @sym |
| // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT |
| EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD); |
| return; |
| } |
| case PPC::ADDISdtprelHA: |
| // Transform: %xd = ADDISdtprelHA %xs, @sym |
| // Into: %xd = ADDIS8 %xs, sym@dtprel@ha |
| case PPC::ADDISdtprelHA32: { |
| // Transform: %rd = ADDISdtprelHA32 %rs, @sym |
| // Into: %rd = ADDIS %rs, 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(IsPPC64 ? PPC::ADDIS8 : PPC::ADDIS) |
| .addReg(MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(1).getReg()) |
| .addExpr(SymDtprel)); |
| return; |
| } |
| case PPC::ADDIdtprelL: |
| // Transform: %xd = ADDIdtprelL %xs, @sym |
| // Into: %xd = ADDI8 %xs, sym@dtprel@l |
| case PPC::ADDIdtprelL32: { |
| // Transform: %rd = ADDIdtprelL32 %rs, @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(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 (!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::EmitInstruction(const MachineInstr *MI) { |
| if (!Subtarget->isPPC64()) |
| return PPCAsmPrinter::EmitInstruction(MI); |
| |
| switch (MI->getOpcode()) { |
| default: |
| return PPCAsmPrinter::EmitInstruction(MI); |
| case TargetOpcode::PATCHABLE_FUNCTION_ENTER: { |
| // .begin: |
| // b .end # lis 0, FuncId[16..32] |
| // nop # li 0, FuncId[0..15] |
| // std 0, -8(1) |
| // mflr 0 |
| // bl __xray_FunctionEntry |
| // mtlr 0 |
| // .end: |
| // |
| // Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number |
| // of instructions change. |
| MCSymbol *BeginOfSled = OutContext.createTempSymbol(); |
| MCSymbol *EndOfSled = OutContext.createTempSymbol(); |
| OutStreamer->EmitLabel(BeginOfSled); |
| EmitToStreamer(*OutStreamer, |
| MCInstBuilder(PPC::B).addExpr( |
| MCSymbolRefExpr::create(EndOfSled, OutContext))); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP)); |
| EmitToStreamer( |
| *OutStreamer, |
| MCInstBuilder(PPC::STD).addReg(PPC::X0).addImm(-8).addReg(PPC::X1)); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR8).addReg(PPC::X0)); |
| EmitToStreamer(*OutStreamer, |
| MCInstBuilder(PPC::BL8_NOP) |
| .addExpr(MCSymbolRefExpr::create( |
| OutContext.getOrCreateSymbol("__xray_FunctionEntry"), |
| OutContext))); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR8).addReg(PPC::X0)); |
| OutStreamer->EmitLabel(EndOfSled); |
| recordSled(BeginOfSled, *MI, SledKind::FUNCTION_ENTER); |
| break; |
| } |
| case TargetOpcode::PATCHABLE_RET: { |
| unsigned RetOpcode = MI->getOperand(0).getImm(); |
| MCInst RetInst; |
| RetInst.setOpcode(RetOpcode); |
| for (const auto &MO : |
| make_range(std::next(MI->operands_begin()), MI->operands_end())) { |
| MCOperand MCOp; |
| if (LowerPPCMachineOperandToMCOperand(MO, MCOp, *this, false)) |
| RetInst.addOperand(MCOp); |
| } |
| |
| bool IsConditional; |
| if (RetOpcode == PPC::BCCLR) { |
| IsConditional = true; |
| } else if (RetOpcode == PPC::TCRETURNdi8 || RetOpcode == PPC::TCRETURNri8 || |
| RetOpcode == PPC::TCRETURNai8) { |
| break; |
| } else if (RetOpcode == PPC::BLR8 || RetOpcode == PPC::TAILB8) { |
| IsConditional = false; |
| } else { |
| EmitToStreamer(*OutStreamer, RetInst); |
| break; |
| } |
| |
| MCSymbol *FallthroughLabel; |
| if (IsConditional) { |
| // Before: |
| // bgtlr cr0 |
| // |
| // After: |
| // ble cr0, .end |
| // .p2align 3 |
| // .begin: |
| // blr # lis 0, FuncId[16..32] |
| // nop # li 0, FuncId[0..15] |
| // std 0, -8(1) |
| // mflr 0 |
| // bl __xray_FunctionExit |
| // mtlr 0 |
| // blr |
| // .end: |
| // |
| // Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number |
| // of instructions change. |
| FallthroughLabel = OutContext.createTempSymbol(); |
| EmitToStreamer( |
| *OutStreamer, |
| MCInstBuilder(PPC::BCC) |
| .addImm(PPC::InvertPredicate( |
| static_cast<PPC::Predicate>(MI->getOperand(1).getImm()))) |
| .addReg(MI->getOperand(2).getReg()) |
| .addExpr(MCSymbolRefExpr::create(FallthroughLabel, OutContext))); |
| RetInst = MCInst(); |
| RetInst.setOpcode(PPC::BLR8); |
| } |
| // .p2align 3 |
| // .begin: |
| // b(lr)? # lis 0, FuncId[16..32] |
| // nop # li 0, FuncId[0..15] |
| // std 0, -8(1) |
| // mflr 0 |
| // bl __xray_FunctionExit |
| // mtlr 0 |
| // b(lr)? |
| // |
| // Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number |
| // of instructions change. |
| OutStreamer->EmitCodeAlignment(8); |
| MCSymbol *BeginOfSled = OutContext.createTempSymbol(); |
| OutStreamer->EmitLabel(BeginOfSled); |
| EmitToStreamer(*OutStreamer, RetInst); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP)); |
| EmitToStreamer( |
| *OutStreamer, |
| MCInstBuilder(PPC::STD).addReg(PPC::X0).addImm(-8).addReg(PPC::X1)); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR8).addReg(PPC::X0)); |
| EmitToStreamer(*OutStreamer, |
| MCInstBuilder(PPC::BL8_NOP) |
| .addExpr(MCSymbolRefExpr::create( |
| OutContext.getOrCreateSymbol("__xray_FunctionExit"), |
| OutContext))); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR8).addReg(PPC::X0)); |
| EmitToStreamer(*OutStreamer, RetInst); |
| if (IsConditional) |
| OutStreamer->EmitLabel(FallthroughLabel); |
| recordSled(BeginOfSled, *MI, SledKind::FUNCTION_EXIT); |
| break; |
| } |
| case TargetOpcode::PATCHABLE_FUNCTION_EXIT: |
| llvm_unreachable("PATCHABLE_FUNCTION_EXIT should never be emitted"); |
| case TargetOpcode::PATCHABLE_TAIL_CALL: |
| // TODO: Define a trampoline `__xray_FunctionTailExit` and differentiate a |
| // normal function exit from a tail exit. |
| llvm_unreachable("Tail call is handled in the normal case. See comments " |
| "around this assert."); |
| } |
| } |
| |
| void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) { |
| if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) { |
| PPCTargetStreamer *TS = |
| static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer()); |
| |
| if (TS) |
| TS->emitAbiVersion(2); |
| } |
| |
| if (static_cast<const PPCTargetMachine &>(TM).isPPC64() || |
| !isPositionIndependent()) |
| return AsmPrinter::EmitStartOfAsmFile(M); |
| |
| if (M.getPICLevel() == PICLevel::SmallPIC) |
| return AsmPrinter::EmitStartOfAsmFile(M); |
| |
| OutStreamer->SwitchSection(OutContext.getELFSection( |
| ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC)); |
| |
| 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() && |
| (!isPositionIndependent() || |
| MF->getFunction().getParent()->getPICLevel() == PICLevel::SmallPIC)) |
| return AsmPrinter::EmitFunctionEntryLabel(); |
| |
| if (!Subtarget->isPPC64()) { |
| const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>(); |
| if (PPCFI->usesPICBase() && !Subtarget->isSecurePlt()) { |
| 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()) { |
| // In the Large code model, we allow arbitrary displacements between |
| // the text section and its associated TOC section. We place the |
| // full 8-byte offset to the TOC in memory immediately preceding |
| // the function global entry point. |
| if (TM.getCodeModel() == CodeModel::Large |
| && !MF->getRegInfo().use_empty(PPC::X2)) { |
| const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>(); |
| |
| MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC.")); |
| MCSymbol *GlobalEPSymbol = PPCFI->getGlobalEPSymbol(); |
| const MCExpr *TOCDeltaExpr = |
| MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext), |
| MCSymbolRefExpr::create(GlobalEPSymbol, |
| OutContext), |
| OutContext); |
| |
| OutStreamer->EmitLabel(PPCFI->getTOCOffsetSymbol()); |
| OutStreamer->EmitValue(TOCDeltaExpr, 8); |
| } |
| return AsmPrinter::EmitFunctionEntryLabel(); |
| } |
| |
| // Emit an official procedure descriptor. |
| MCSectionSubPair Current = OutStreamer->getCurrentSection(); |
| MCSectionELF *Section = OutStreamer->getContext().getELFSection( |
| ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC); |
| OutStreamer->SwitchSection(Section); |
| OutStreamer->EmitLabel(CurrentFnSym); |
| OutStreamer->EmitValueToAlignment(8); |
| MCSymbol *Symbol1 = CurrentFnSymForSize; |
| // 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); |
| } |
| |
| bool PPCLinuxAsmPrinter::doFinalization(Module &M) { |
| const DataLayout &DL = getDataLayout(); |
| |
| bool isPPC64 = DL.getPointerSizeInBits() == 64; |
| |
| PPCTargetStreamer &TS = |
| static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer()); |
| |
| if (!TOC.empty()) { |
| MCSectionELF *Section; |
| |
| if (isPPC64) |
| Section = OutStreamer->getContext().getELFSection( |
| ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC); |
| else |
| Section = OutStreamer->getContext().getELFSection( |
| ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC); |
| OutStreamer->SwitchSection(Section); |
| |
| for (const auto &TOCMapPair : TOC) { |
| const MCSymbol *const TOCEntryTarget = TOCMapPair.first; |
| MCSymbol *const TOCEntryLabel = TOCMapPair.second; |
| |
| OutStreamer->EmitLabel(TOCEntryLabel); |
| if (isPPC64) { |
| TS.emitTCEntry(*TOCEntryTarget); |
| } else { |
| OutStreamer->EmitValueToAlignment(4); |
| OutStreamer->EmitSymbolValue(TOCEntryTarget, 4); |
| } |
| } |
| } |
| |
| 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: |
| // .Lfunc_gepNN: |
| // # global entry point |
| // addis r2,r12,(.TOC.-.Lfunc_gepNN)@ha |
| // addi r2,r2,(.TOC.-.Lfunc_gepNN)@l |
| // .Lfunc_lepNN: |
| // .localentry func, .Lfunc_lepNN-.Lfunc_gepNN |
| // # local entry point, followed by function body |
| // |
| // For the Large code model, we create |
| // |
| // .Lfunc_tocNN: |
| // .quad .TOC.-.Lfunc_gepNN # done by EmitFunctionEntryLabel |
| // func: |
| // .Lfunc_gepNN: |
| // # global entry point |
| // ld r2,.Lfunc_tocNN-.Lfunc_gepNN(r12) |
| // add r2,r2,r12 |
| // .Lfunc_lepNN: |
| // .localentry func, .Lfunc_lepNN-.Lfunc_gepNN |
| // # 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)) { |
| // Note: The logic here must be synchronized with the code in the |
| // branch-selection pass which sets the offset of the first block in the |
| // function. This matters because it affects the alignment. |
| const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>(); |
| |
| MCSymbol *GlobalEntryLabel = PPCFI->getGlobalEPSymbol(); |
| OutStreamer->EmitLabel(GlobalEntryLabel); |
| const MCSymbolRefExpr *GlobalEntryLabelExp = |
| MCSymbolRefExpr::create(GlobalEntryLabel, OutContext); |
| |
| if (TM.getCodeModel() != CodeModel::Large) { |
| 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)); |
| } else { |
| MCSymbol *TOCOffset = PPCFI->getTOCOffsetSymbol(); |
| const MCExpr *TOCOffsetDeltaExpr = |
| MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCOffset, OutContext), |
| GlobalEntryLabelExp, OutContext); |
| |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD) |
| .addReg(PPC::X2) |
| .addExpr(TOCOffsetDeltaExpr) |
| .addReg(PPC::X12)); |
| EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD8) |
| .addReg(PPC::X2) |
| .addReg(PPC::X2) |
| .addReg(PPC::X12)); |
| } |
| |
| MCSymbol *LocalEntryLabel = PPCFI->getLocalEPSymbol(); |
| 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(cast<MCSymbolELF>(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 PPCAIXAsmPrinter::SetupMachineFunction(MachineFunction &MF) { |
| // Get the function descriptor symbol. |
| CurrentFnDescSym = getSymbol(&MF.getFunction()); |
| // Set the containing csect. |
| MCSectionXCOFF *FnDescSec = OutStreamer->getContext().getXCOFFSection( |
| CurrentFnDescSym->getName(), XCOFF::XMC_DS, XCOFF::XTY_SD, |
| XCOFF::C_HIDEXT, SectionKind::getData()); |
| cast<MCSymbolXCOFF>(CurrentFnDescSym)->setContainingCsect(FnDescSec); |
| |
| return AsmPrinter::SetupMachineFunction(MF); |
| } |
| |
| void PPCAIXAsmPrinter::ValidateGV(const GlobalVariable *GV) { |
| // Early error checking limiting what is supported. |
| if (GV->isThreadLocal()) |
| report_fatal_error("Thread local not yet supported on AIX."); |
| |
| if (GV->hasSection()) |
| report_fatal_error("Custom section for Data not yet supported."); |
| |
| if (GV->hasComdat()) |
| report_fatal_error("COMDAT not yet supported by AIX."); |
| } |
| |
| const MCExpr *PPCAIXAsmPrinter::lowerConstant(const Constant *CV) { |
| if (const Function *F = dyn_cast<Function>(CV)) { |
| MCSymbolXCOFF *FSym = cast<MCSymbolXCOFF>(getSymbol(F)); |
| if (!FSym->hasContainingCsect()) { |
| const XCOFF::StorageClass SC = |
| F->isDeclaration() |
| ? TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(F) |
| : XCOFF::C_HIDEXT; |
| MCSectionXCOFF *Csect = OutStreamer->getContext().getXCOFFSection( |
| FSym->getName(), XCOFF::XMC_DS, |
| F->isDeclaration() ? XCOFF::XTY_ER : XCOFF::XTY_SD, SC, |
| SectionKind::getData()); |
| FSym->setContainingCsect(Csect); |
| } |
| return MCSymbolRefExpr::create( |
| FSym->getContainingCsect()->getQualNameSymbol(), OutContext); |
| } |
| return PPCAsmPrinter::lowerConstant(CV); |
| } |
| |
| void PPCAIXAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { |
| ValidateGV(GV); |
| |
| // External global variables are already handled. |
| if (!GV->hasInitializer()) |
| return; |
| |
| // Create the symbol, set its storage class. |
| MCSymbolXCOFF *GVSym = cast<MCSymbolXCOFF>(getSymbol(GV)); |
| GVSym->setStorageClass( |
| TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GV)); |
| |
| SectionKind GVKind = getObjFileLowering().getKindForGlobal(GV, TM); |
| if ((!GVKind.isGlobalWriteableData() && !GVKind.isReadOnly()) || |
| GVKind.isMergeable2ByteCString() || GVKind.isMergeable4ByteCString()) |
| report_fatal_error("Encountered a global variable kind that is " |
| "not supported yet."); |
| |
| // Create the containing csect and switch to it. |
| MCSectionXCOFF *Csect = cast<MCSectionXCOFF>( |
| getObjFileLowering().SectionForGlobal(GV, GVKind, TM)); |
| OutStreamer->SwitchSection(Csect); |
| GVSym->setContainingCsect(Csect); |
| |
| const DataLayout &DL = GV->getParent()->getDataLayout(); |
| |
| // Handle common symbols. |
| if (GVKind.isCommon() || GVKind.isBSSLocal()) { |
| unsigned Align = |
| GV->getAlignment() ? GV->getAlignment() : DL.getPreferredAlignment(GV); |
| uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType()); |
| |
| if (GVKind.isBSSLocal()) |
| OutStreamer->EmitXCOFFLocalCommonSymbol( |
| GVSym, Size, Csect->getQualNameSymbol(), Align); |
| else |
| OutStreamer->EmitCommonSymbol(Csect->getQualNameSymbol(), Size, Align); |
| return; |
| } |
| |
| MCSymbol *EmittedInitSym = GVSym; |
| EmitLinkage(GV, EmittedInitSym); |
| EmitAlignment(getGVAlignment(GV, DL), GV); |
| OutStreamer->EmitLabel(EmittedInitSym); |
| EmitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer()); |
| } |
| |
| void PPCAIXAsmPrinter::EmitFunctionDescriptor() { |
| const DataLayout &DL = getDataLayout(); |
| const unsigned PointerSize = DL.getPointerSizeInBits() == 64 ? 8 : 4; |
| |
| MCSectionSubPair Current = OutStreamer->getCurrentSection(); |
| // Emit function descriptor. |
| OutStreamer->SwitchSection( |
| cast<MCSymbolXCOFF>(CurrentFnDescSym)->getContainingCsect()); |
| OutStreamer->EmitLabel(CurrentFnDescSym); |
| // Emit function entry point address. |
| OutStreamer->EmitValue(MCSymbolRefExpr::create(CurrentFnSym, OutContext), |
| PointerSize); |
| // Emit TOC base address. |
| const MCSectionXCOFF *TOCBaseSec = OutStreamer->getContext().getXCOFFSection( |
| StringRef("TOC"), XCOFF::XMC_TC0, XCOFF::XTY_SD, XCOFF::C_HIDEXT, |
| SectionKind::getData()); |
| const MCSymbol *TOCBaseSym = TOCBaseSec->getQualNameSymbol(); |
| OutStreamer->EmitValue(MCSymbolRefExpr::create(TOCBaseSym, OutContext), |
| PointerSize); |
| // Emit a null environment pointer. |
| OutStreamer->EmitIntValue(0, PointerSize); |
| |
| OutStreamer->SwitchSection(Current.first, Current.second); |
| } |
| |
| void PPCAIXAsmPrinter::EmitEndOfAsmFile(Module &M) { |
| // If there are no functions in this module, we will never need to reference |
| // the TOC base. |
| if (M.empty()) |
| return; |
| |
| // Emit TOC base. |
| MCSectionXCOFF *TOCBaseSection = OutStreamer->getContext().getXCOFFSection( |
| StringRef("TOC"), XCOFF::XMC_TC0, XCOFF::XTY_SD, XCOFF::C_HIDEXT, |
| SectionKind::getData()); |
| // The TOC-base always has 0 size, but 4 byte alignment. |
| TOCBaseSection->setAlignment(Align(4)); |
| // Switch to section to emit TOC base. |
| OutStreamer->SwitchSection(TOCBaseSection); |
| |
| PPCTargetStreamer &TS = |
| static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer()); |
| |
| for (auto &I : TOC) { |
| // Setup the csect for the current TC entry. |
| MCSectionXCOFF *TCEntry = OutStreamer->getContext().getXCOFFSection( |
| cast<MCSymbolXCOFF>(I.first)->getUnqualifiedName(), XCOFF::XMC_TC, |
| XCOFF::XTY_SD, XCOFF::C_HIDEXT, SectionKind::getData()); |
| cast<MCSymbolXCOFF>(I.second)->setContainingCsect(TCEntry); |
| OutStreamer->SwitchSection(TCEntry); |
| |
| OutStreamer->EmitLabel(I.second); |
| TS.emitTCEntry(*I.first); |
| } |
| } |
| |
| MCSymbol * |
| PPCAIXAsmPrinter::getMCSymbolForTOCPseudoMO(const MachineOperand &MO) { |
| const GlobalObject *GO = nullptr; |
| |
| // If the MO is a function or certain kind of globals, we want to make sure to |
| // refer to the csect symbol, otherwise we can just do the default handling. |
| if (MO.getType() != MachineOperand::MO_GlobalAddress || |
| !(GO = dyn_cast<const GlobalObject>(MO.getGlobal()))) |
| return PPCAsmPrinter::getMCSymbolForTOCPseudoMO(MO); |
| |
| // Do an early error check for globals we don't support. This will go away |
| // eventually. |
| const auto *GV = dyn_cast<const GlobalVariable>(GO); |
| if (GV) { |
| ValidateGV(GV); |
| } |
| |
| MCSymbolXCOFF *XSym = cast<MCSymbolXCOFF>(getSymbol(GO)); |
| |
| // If the global object is a global variable without initializer or is a |
| // declaration of a function, then XSym is an external referenced symbol. |
| // Hence we may need to explictly create a MCSectionXCOFF for it so that we |
| // can return its symbol later. |
| if (GO->isDeclaration()) { |
| if (!XSym->hasContainingCsect()) { |
| // Make sure the storage class is set. |
| const XCOFF::StorageClass SC = |
| TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GO); |
| XSym->setStorageClass(SC); |
| |
| MCSectionXCOFF *Csect = OutStreamer->getContext().getXCOFFSection( |
| XSym->getName(), isa<Function>(GO) ? XCOFF::XMC_DS : XCOFF::XMC_UA, |
| XCOFF::XTY_ER, SC, SectionKind::getMetadata()); |
| XSym->setContainingCsect(Csect); |
| } |
| |
| return XSym->getContainingCsect()->getQualNameSymbol(); |
| } |
| |
| // Handle initialized global variables and defined functions. |
| SectionKind GOKind = getObjFileLowering().getKindForGlobal(GO, TM); |
| |
| if (GOKind.isText()) { |
| // If the MO is a function, we want to make sure to refer to the function |
| // descriptor csect. |
| return OutStreamer->getContext() |
| .getXCOFFSection(XSym->getName(), XCOFF::XMC_DS, XCOFF::XTY_SD, |
| XCOFF::C_HIDEXT, SectionKind::getData()) |
| ->getQualNameSymbol(); |
| } else if (GOKind.isCommon() || GOKind.isBSSLocal()) { |
| // If the operand is a common then we should refer to the csect symbol. |
| return cast<MCSectionXCOFF>( |
| getObjFileLowering().SectionForGlobal(GO, GOKind, TM)) |
| ->getQualNameSymbol(); |
| } |
| |
| // Other global variables are refered to by labels inside of a single csect, |
| // so refer to the label directly. |
| return getSymbol(GV); |
| } |
| |
| /// 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, |
| std::unique_ptr<MCStreamer> &&Streamer) { |
| if (tm.getTargetTriple().isOSAIX()) |
| return new PPCAIXAsmPrinter(tm, std::move(Streamer)); |
| |
| return new PPCLinuxAsmPrinter(tm, std::move(Streamer)); |
| } |
| |
| // Force static initialization. |
| extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCAsmPrinter() { |
| TargetRegistry::RegisterAsmPrinter(getThePPC32Target(), |
| createPPCAsmPrinterPass); |
| TargetRegistry::RegisterAsmPrinter(getThePPC64Target(), |
| createPPCAsmPrinterPass); |
| TargetRegistry::RegisterAsmPrinter(getThePPC64LETarget(), |
| createPPCAsmPrinterPass); |
| } |
