mirror of
https://github.com/jeremysrand/llvm-65816.git
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207 lines
6.1 KiB
C++
207 lines
6.1 KiB
C++
//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===//
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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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#include "MCTargetDesc/PPCMCTargetDesc.h"
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#include "MCTargetDesc/PPCFixupKinds.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCFixupKindInfo.h"
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#include "llvm/MC/MCMachObjectWriter.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCValue.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/MachO.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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static uint64_t adjustFixupValue(unsigned Kind, uint64_t Value) {
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switch (Kind) {
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default:
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llvm_unreachable("Unknown fixup kind!");
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case FK_Data_1:
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case FK_Data_2:
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case FK_Data_4:
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case FK_Data_8:
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case PPC::fixup_ppc_nofixup:
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return Value;
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case PPC::fixup_ppc_brcond14:
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case PPC::fixup_ppc_brcond14abs:
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return Value & 0xfffc;
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case PPC::fixup_ppc_br24:
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case PPC::fixup_ppc_br24abs:
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return Value & 0x3fffffc;
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case PPC::fixup_ppc_half16:
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return Value & 0xffff;
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case PPC::fixup_ppc_half16ds:
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return Value & 0xfffc;
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}
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}
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static unsigned getFixupKindNumBytes(unsigned Kind) {
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switch (Kind) {
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default:
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llvm_unreachable("Unknown fixup kind!");
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case FK_Data_1:
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return 1;
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case FK_Data_2:
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case PPC::fixup_ppc_half16:
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case PPC::fixup_ppc_half16ds:
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return 2;
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case FK_Data_4:
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case PPC::fixup_ppc_brcond14:
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case PPC::fixup_ppc_brcond14abs:
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case PPC::fixup_ppc_br24:
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case PPC::fixup_ppc_br24abs:
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return 4;
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case FK_Data_8:
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return 8;
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case PPC::fixup_ppc_nofixup:
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return 0;
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}
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}
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namespace {
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class PPCAsmBackend : public MCAsmBackend {
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const Target &TheTarget;
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public:
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PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {}
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unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; }
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const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
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const static MCFixupKindInfo Infos[PPC::NumTargetFixupKinds] = {
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// name offset bits flags
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{ "fixup_ppc_br24", 6, 24, MCFixupKindInfo::FKF_IsPCRel },
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{ "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel },
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{ "fixup_ppc_br24abs", 6, 24, 0 },
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{ "fixup_ppc_brcond14abs", 16, 14, 0 },
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{ "fixup_ppc_half16", 0, 16, 0 },
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{ "fixup_ppc_half16ds", 0, 14, 0 },
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{ "fixup_ppc_nofixup", 0, 0, 0 }
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};
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if (Kind < FirstTargetFixupKind)
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return MCAsmBackend::getFixupKindInfo(Kind);
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assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
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"Invalid kind!");
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return Infos[Kind - FirstTargetFixupKind];
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}
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void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
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uint64_t Value) const {
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Value = adjustFixupValue(Fixup.getKind(), Value);
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if (!Value) return; // Doesn't change encoding.
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unsigned Offset = Fixup.getOffset();
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unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
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// For each byte of the fragment that the fixup touches, mask in the bits
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// from the fixup value. The Value has been "split up" into the appropriate
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// bitfields above.
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for (unsigned i = 0; i != NumBytes; ++i)
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Data[Offset + i] |= uint8_t((Value >> ((NumBytes - i - 1)*8)) & 0xff);
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}
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bool mayNeedRelaxation(const MCInst &Inst) const {
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// FIXME.
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return false;
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}
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bool fixupNeedsRelaxation(const MCFixup &Fixup,
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uint64_t Value,
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const MCRelaxableFragment *DF,
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const MCAsmLayout &Layout) const {
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// FIXME.
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llvm_unreachable("relaxInstruction() unimplemented");
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}
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void relaxInstruction(const MCInst &Inst, MCInst &Res) const {
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// FIXME.
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llvm_unreachable("relaxInstruction() unimplemented");
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}
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bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
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uint64_t NumNops = Count / 4;
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for (uint64_t i = 0; i != NumNops; ++i)
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OW->Write32(0x60000000);
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switch (Count % 4) {
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default: break; // No leftover bytes to write
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case 1: OW->Write8(0); break;
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case 2: OW->Write16(0); break;
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case 3: OW->Write16(0); OW->Write8(0); break;
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}
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return true;
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}
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unsigned getPointerSize() const {
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StringRef Name = TheTarget.getName();
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if (Name == "ppc64" || Name == "ppc64le") return 8;
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assert(Name == "ppc32" && "Unknown target name!");
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return 4;
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}
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};
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} // end anonymous namespace
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// FIXME: This should be in a separate file.
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namespace {
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class DarwinPPCAsmBackend : public PPCAsmBackend {
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public:
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DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { }
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MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
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bool is64 = getPointerSize() == 8;
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return createPPCMachObjectWriter(
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OS,
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/*Is64Bit=*/is64,
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(is64 ? MachO::CPU_TYPE_POWERPC64 : MachO::CPU_TYPE_POWERPC),
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MachO::CPU_SUBTYPE_POWERPC_ALL);
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}
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virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
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return false;
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}
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};
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class ELFPPCAsmBackend : public PPCAsmBackend {
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uint8_t OSABI;
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public:
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ELFPPCAsmBackend(const Target &T, uint8_t OSABI) :
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PPCAsmBackend(T), OSABI(OSABI) { }
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MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
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bool is64 = getPointerSize() == 8;
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return createPPCELFObjectWriter(OS, is64, OSABI);
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}
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virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
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return false;
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}
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};
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} // end anonymous namespace
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MCAsmBackend *llvm::createPPCAsmBackend(const Target &T,
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const MCRegisterInfo &MRI,
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StringRef TT, StringRef CPU) {
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if (Triple(TT).isOSDarwin())
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return new DarwinPPCAsmBackend(T);
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uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
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return new ELFPPCAsmBackend(T, OSABI);
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}
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