276 lines
9.2 KiB
C++
276 lines
9.2 KiB
C++
//===-- PPCMCTargetDesc.cpp - PowerPC Target Descriptions -----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides PowerPC specific target descriptions.
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//
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//===----------------------------------------------------------------------===//
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#include "PPCMCTargetDesc.h"
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#include "InstPrinter/PPCInstPrinter.h"
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#include "PPCMCAsmInfo.h"
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#include "PPCTargetStreamer.h"
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#include "llvm/MC/MCCodeGenInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCELFStreamer.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/MC/MachineLocation.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define GET_INSTRINFO_MC_DESC
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#include "PPCGenInstrInfo.inc"
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#define GET_SUBTARGETINFO_MC_DESC
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#include "PPCGenSubtargetInfo.inc"
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#define GET_REGINFO_MC_DESC
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#include "PPCGenRegisterInfo.inc"
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// Pin the vtable to this file.
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PPCTargetStreamer::~PPCTargetStreamer() {}
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PPCTargetStreamer::PPCTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
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static MCInstrInfo *createPPCMCInstrInfo() {
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MCInstrInfo *X = new MCInstrInfo();
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InitPPCMCInstrInfo(X);
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return X;
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}
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static MCRegisterInfo *createPPCMCRegisterInfo(const Triple &TT) {
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bool isPPC64 =
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(TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le);
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unsigned Flavour = isPPC64 ? 0 : 1;
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unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR;
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MCRegisterInfo *X = new MCRegisterInfo();
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InitPPCMCRegisterInfo(X, RA, Flavour, Flavour);
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return X;
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}
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static MCSubtargetInfo *createPPCMCSubtargetInfo(const Triple &TT,
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StringRef CPU, StringRef FS) {
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return createPPCMCSubtargetInfoImpl(TT, CPU, FS);
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}
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static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI,
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const Triple &TheTriple) {
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bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
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TheTriple.getArch() == Triple::ppc64le);
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MCAsmInfo *MAI;
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if (TheTriple.isOSDarwin())
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MAI = new PPCMCAsmInfoDarwin(isPPC64, TheTriple);
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else
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MAI = new PPCELFMCAsmInfo(isPPC64, TheTriple);
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// Initial state of the frame pointer is R1.
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unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1;
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MCCFIInstruction Inst =
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MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0);
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MAI->addInitialFrameState(Inst);
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return MAI;
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}
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static MCCodeGenInfo *createPPCMCCodeGenInfo(const Triple &TT, Reloc::Model RM,
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CodeModel::Model CM,
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CodeGenOpt::Level OL) {
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MCCodeGenInfo *X = new MCCodeGenInfo();
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if (RM == Reloc::Default) {
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if (TT.isOSDarwin())
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RM = Reloc::DynamicNoPIC;
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else
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RM = Reloc::Static;
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}
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if (CM == CodeModel::Default) {
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if (!TT.isOSDarwin() &&
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(TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le))
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CM = CodeModel::Medium;
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}
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X->initMCCodeGenInfo(RM, CM, OL);
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return X;
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}
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namespace {
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class PPCTargetAsmStreamer : public PPCTargetStreamer {
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formatted_raw_ostream &OS;
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public:
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PPCTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS)
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: PPCTargetStreamer(S), OS(OS) {}
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void emitTCEntry(const MCSymbol &S) override {
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OS << "\t.tc ";
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OS << S.getName();
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OS << "[TC],";
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OS << S.getName();
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OS << '\n';
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}
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void emitMachine(StringRef CPU) override {
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OS << "\t.machine " << CPU << '\n';
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}
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void emitAbiVersion(int AbiVersion) override {
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OS << "\t.abiversion " << AbiVersion << '\n';
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}
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void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
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const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
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OS << "\t.localentry\t";
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S->print(OS, MAI);
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OS << ", ";
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LocalOffset->print(OS, MAI);
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OS << '\n';
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}
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};
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class PPCTargetELFStreamer : public PPCTargetStreamer {
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public:
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PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
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MCELFStreamer &getStreamer() {
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return static_cast<MCELFStreamer &>(Streamer);
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}
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void emitTCEntry(const MCSymbol &S) override {
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// Creates a R_PPC64_TOC relocation
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Streamer.EmitValueToAlignment(8);
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Streamer.EmitSymbolValue(&S, 8);
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}
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void emitMachine(StringRef CPU) override {
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// FIXME: Is there anything to do in here or does this directive only
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// limit the parser?
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}
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void emitAbiVersion(int AbiVersion) override {
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MCAssembler &MCA = getStreamer().getAssembler();
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unsigned Flags = MCA.getELFHeaderEFlags();
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Flags &= ~ELF::EF_PPC64_ABI;
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Flags |= (AbiVersion & ELF::EF_PPC64_ABI);
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MCA.setELFHeaderEFlags(Flags);
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}
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void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
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MCAssembler &MCA = getStreamer().getAssembler();
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int64_t Res;
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if (!LocalOffset->evaluateAsAbsolute(Res, MCA))
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report_fatal_error(".localentry expression must be absolute.");
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unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res);
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if (Res != ELF::decodePPC64LocalEntryOffset(Encoded))
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report_fatal_error(".localentry expression cannot be encoded.");
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unsigned Other = S->getOther();
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Other &= ~ELF::STO_PPC64_LOCAL_MASK;
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Other |= Encoded;
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S->setOther(Other);
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// For GAS compatibility, unless we already saw a .abiversion directive,
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// set e_flags to indicate ELFv2 ABI.
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unsigned Flags = MCA.getELFHeaderEFlags();
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if ((Flags & ELF::EF_PPC64_ABI) == 0)
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MCA.setELFHeaderEFlags(Flags | 2);
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}
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void emitAssignment(MCSymbol *S, const MCExpr *Value) override {
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auto *Symbol = cast<MCSymbolELF>(S);
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// When encoding an assignment to set symbol A to symbol B, also copy
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// the st_other bits encoding the local entry point offset.
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if (Value->getKind() != MCExpr::SymbolRef)
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return;
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const auto &RhsSym = cast<MCSymbolELF>(
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static_cast<const MCSymbolRefExpr *>(Value)->getSymbol());
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unsigned Other = Symbol->getOther();
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Other &= ~ELF::STO_PPC64_LOCAL_MASK;
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Other |= RhsSym.getOther() & ELF::STO_PPC64_LOCAL_MASK;
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Symbol->setOther(Other);
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}
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};
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class PPCTargetMachOStreamer : public PPCTargetStreamer {
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public:
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PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
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void emitTCEntry(const MCSymbol &S) override {
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llvm_unreachable("Unknown pseudo-op: .tc");
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}
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void emitMachine(StringRef CPU) override {
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// FIXME: We should update the CPUType, CPUSubType in the Object file if
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// the new values are different from the defaults.
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}
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void emitAbiVersion(int AbiVersion) override {
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llvm_unreachable("Unknown pseudo-op: .abiversion");
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}
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void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
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llvm_unreachable("Unknown pseudo-op: .localentry");
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}
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};
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}
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static MCTargetStreamer *createAsmTargetStreamer(MCStreamer &S,
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formatted_raw_ostream &OS,
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MCInstPrinter *InstPrint,
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bool isVerboseAsm) {
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return new PPCTargetAsmStreamer(S, OS);
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}
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static MCTargetStreamer *
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createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
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const Triple &TT = STI.getTargetTriple();
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if (TT.isOSBinFormatELF())
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return new PPCTargetELFStreamer(S);
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return new PPCTargetMachOStreamer(S);
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}
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static MCInstPrinter *createPPCMCInstPrinter(const Triple &T,
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unsigned SyntaxVariant,
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const MCAsmInfo &MAI,
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const MCInstrInfo &MII,
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const MCRegisterInfo &MRI) {
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return new PPCInstPrinter(MAI, MII, MRI, T.isOSDarwin());
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}
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extern "C" void LLVMInitializePowerPCTargetMC() {
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for (Target *T : {&ThePPC32Target, &ThePPC64Target, &ThePPC64LETarget}) {
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// Register the MC asm info.
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RegisterMCAsmInfoFn C(*T, createPPCMCAsmInfo);
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// Register the MC codegen info.
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TargetRegistry::RegisterMCCodeGenInfo(*T, createPPCMCCodeGenInfo);
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// Register the MC instruction info.
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TargetRegistry::RegisterMCInstrInfo(*T, createPPCMCInstrInfo);
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// Register the MC register info.
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TargetRegistry::RegisterMCRegInfo(*T, createPPCMCRegisterInfo);
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// Register the MC subtarget info.
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TargetRegistry::RegisterMCSubtargetInfo(*T, createPPCMCSubtargetInfo);
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// Register the MC Code Emitter
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TargetRegistry::RegisterMCCodeEmitter(*T, createPPCMCCodeEmitter);
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// Register the asm backend.
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TargetRegistry::RegisterMCAsmBackend(*T, createPPCAsmBackend);
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// Register the object target streamer.
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TargetRegistry::RegisterObjectTargetStreamer(*T,
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createObjectTargetStreamer);
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// Register the asm target streamer.
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TargetRegistry::RegisterAsmTargetStreamer(*T, createAsmTargetStreamer);
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// Register the MCInstPrinter.
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TargetRegistry::RegisterMCInstPrinter(*T, createPPCMCInstPrinter);
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}
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}
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