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https://github.com/c64scene-ar/llvm-6502.git
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930ca98433
The fix itself is fairly simple: move getAccessVariant to MCValue so that we replace the old weak expression evaluation with the far more general EvaluateAsRelocatable. This then requires that EvaluateAsRelocatable stop when it finds a non trivial reference kind. And that in turn requires the ELF writer to look harder for weak references. Last but not least, this found a case where we were being bug by bug compatible with gas and accepting an invalid input. I reported pr19647 to track it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207920 91177308-0d34-0410-b5e6-96231b3b80d8
116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
//===-- SystemZMCObjectWriter.cpp - SystemZ ELF writer --------------------===//
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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/SystemZMCTargetDesc.h"
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#include "MCTargetDesc/SystemZMCFixups.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCValue.h"
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using namespace llvm;
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namespace {
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class SystemZObjectWriter : public MCELFObjectTargetWriter {
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public:
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SystemZObjectWriter(uint8_t OSABI);
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virtual ~SystemZObjectWriter();
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protected:
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// Override MCELFObjectTargetWriter.
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unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
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bool IsPCRel) const override;
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};
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} // end anonymous namespace
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SystemZObjectWriter::SystemZObjectWriter(uint8_t OSABI)
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: MCELFObjectTargetWriter(/*Is64Bit=*/true, OSABI, ELF::EM_S390,
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/*HasRelocationAddend=*/ true) {}
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SystemZObjectWriter::~SystemZObjectWriter() {
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}
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// Return the relocation type for an absolute value of MCFixupKind Kind.
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static unsigned getAbsoluteReloc(unsigned Kind) {
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switch (Kind) {
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case FK_Data_1: return ELF::R_390_8;
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case FK_Data_2: return ELF::R_390_16;
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case FK_Data_4: return ELF::R_390_32;
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case FK_Data_8: return ELF::R_390_64;
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}
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llvm_unreachable("Unsupported absolute address");
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}
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// Return the relocation type for a PC-relative value of MCFixupKind Kind.
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static unsigned getPCRelReloc(unsigned Kind) {
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switch (Kind) {
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case FK_Data_2: return ELF::R_390_PC16;
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case FK_Data_4: return ELF::R_390_PC32;
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case FK_Data_8: return ELF::R_390_PC64;
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case SystemZ::FK_390_PC16DBL: return ELF::R_390_PC16DBL;
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case SystemZ::FK_390_PC32DBL: return ELF::R_390_PC32DBL;
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case SystemZ::FK_390_PLT16DBL: return ELF::R_390_PLT16DBL;
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case SystemZ::FK_390_PLT32DBL: return ELF::R_390_PLT32DBL;
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}
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llvm_unreachable("Unsupported PC-relative address");
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}
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// Return the R_390_TLS_LE* relocation type for MCFixupKind Kind.
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static unsigned getTLSLEReloc(unsigned Kind) {
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switch (Kind) {
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case FK_Data_4: return ELF::R_390_TLS_LE32;
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case FK_Data_8: return ELF::R_390_TLS_LE64;
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}
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llvm_unreachable("Unsupported absolute address");
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}
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// Return the PLT relocation counterpart of MCFixupKind Kind.
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static unsigned getPLTReloc(unsigned Kind) {
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switch (Kind) {
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case SystemZ::FK_390_PC16DBL: return ELF::R_390_PLT16DBL;
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case SystemZ::FK_390_PC32DBL: return ELF::R_390_PLT32DBL;
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}
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llvm_unreachable("Unsupported absolute address");
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}
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unsigned SystemZObjectWriter::GetRelocType(const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const {
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MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
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unsigned Kind = Fixup.getKind();
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switch (Modifier) {
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case MCSymbolRefExpr::VK_None:
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if (IsPCRel)
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return getPCRelReloc(Kind);
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return getAbsoluteReloc(Kind);
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case MCSymbolRefExpr::VK_NTPOFF:
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assert(!IsPCRel && "NTPOFF shouldn't be PC-relative");
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return getTLSLEReloc(Kind);
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case MCSymbolRefExpr::VK_GOT:
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if (IsPCRel && Kind == SystemZ::FK_390_PC32DBL)
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return ELF::R_390_GOTENT;
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llvm_unreachable("Only PC-relative GOT accesses are supported for now");
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case MCSymbolRefExpr::VK_PLT:
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assert(IsPCRel && "@PLT shouldt be PC-relative");
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return getPLTReloc(Kind);
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default:
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llvm_unreachable("Modifier not supported");
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}
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}
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MCObjectWriter *llvm::createSystemZObjectWriter(raw_ostream &OS,
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uint8_t OSABI) {
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MCELFObjectTargetWriter *MOTW = new SystemZObjectWriter(OSABI);
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return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);
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}
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