efbaf8bc61
In the SystemZMCObjectWriter, we currently just abort in case some unsupported relocation in requested. However, as this situation can be triggered by invalid (inline) assembler input, we should really get a regular error message instead.
182 lines
6.3 KiB
C++
182 lines
6.3 KiB
C++
//===-- SystemZMCObjectWriter.cpp - SystemZ ELF writer --------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/SystemZMCFixups.h"
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#include "MCTargetDesc/SystemZMCTargetDesc.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/MC/MCContext.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/MCFixup.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cassert>
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#include <cstdint>
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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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~SystemZObjectWriter() override = default;
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protected:
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// Override MCELFObjectTargetWriter.
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unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
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const MCFixup &Fixup, 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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// Return the relocation type for an absolute value of MCFixupKind Kind.
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static unsigned getAbsoluteReloc(MCContext &Ctx, SMLoc Loc, 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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case SystemZ::FK_390_12: return ELF::R_390_12;
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case SystemZ::FK_390_20: return ELF::R_390_20;
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}
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Ctx.reportError(Loc, "Unsupported absolute address");
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return 0;
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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(MCContext &Ctx, SMLoc Loc, 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_PC12DBL: return ELF::R_390_PC12DBL;
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case SystemZ::FK_390_PC16DBL: return ELF::R_390_PC16DBL;
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case SystemZ::FK_390_PC24DBL: return ELF::R_390_PC24DBL;
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case SystemZ::FK_390_PC32DBL: return ELF::R_390_PC32DBL;
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}
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Ctx.reportError(Loc, "Unsupported PC-relative address");
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return 0;
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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(MCContext &Ctx, SMLoc Loc, 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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Ctx.reportError(Loc, "Unsupported thread-local address (local-exec)");
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return 0;
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}
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// Return the R_390_TLS_LDO* relocation type for MCFixupKind Kind.
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static unsigned getTLSLDOReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
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switch (Kind) {
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case FK_Data_4: return ELF::R_390_TLS_LDO32;
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case FK_Data_8: return ELF::R_390_TLS_LDO64;
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}
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Ctx.reportError(Loc, "Unsupported thread-local address (local-dynamic)");
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return 0;
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}
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// Return the R_390_TLS_LDM* relocation type for MCFixupKind Kind.
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static unsigned getTLSLDMReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
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switch (Kind) {
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case FK_Data_4: return ELF::R_390_TLS_LDM32;
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case FK_Data_8: return ELF::R_390_TLS_LDM64;
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case SystemZ::FK_390_TLS_CALL: return ELF::R_390_TLS_LDCALL;
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}
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Ctx.reportError(Loc, "Unsupported thread-local address (local-dynamic)");
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return 0;
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}
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// Return the R_390_TLS_GD* relocation type for MCFixupKind Kind.
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static unsigned getTLSGDReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
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switch (Kind) {
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case FK_Data_4: return ELF::R_390_TLS_GD32;
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case FK_Data_8: return ELF::R_390_TLS_GD64;
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case SystemZ::FK_390_TLS_CALL: return ELF::R_390_TLS_GDCALL;
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}
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Ctx.reportError(Loc, "Unsupported thread-local address (general-dynamic)");
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return 0;
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}
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// Return the PLT relocation counterpart of MCFixupKind Kind.
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static unsigned getPLTReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
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switch (Kind) {
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case SystemZ::FK_390_PC12DBL: return ELF::R_390_PLT12DBL;
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case SystemZ::FK_390_PC16DBL: return ELF::R_390_PLT16DBL;
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case SystemZ::FK_390_PC24DBL: return ELF::R_390_PLT24DBL;
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case SystemZ::FK_390_PC32DBL: return ELF::R_390_PLT32DBL;
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}
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Ctx.reportError(Loc, "Unsupported PC-relative PLT address");
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return 0;
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}
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unsigned SystemZObjectWriter::getRelocType(MCContext &Ctx,
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const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const {
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SMLoc Loc = Fixup.getLoc();
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unsigned Kind = Fixup.getKind();
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if (Kind >= FirstLiteralRelocationKind)
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return Kind - FirstLiteralRelocationKind;
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MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
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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(Ctx, Loc, Kind);
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return getAbsoluteReloc(Ctx, Loc, 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(Ctx, Loc, Kind);
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case MCSymbolRefExpr::VK_INDNTPOFF:
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if (IsPCRel && Kind == SystemZ::FK_390_PC32DBL)
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return ELF::R_390_TLS_IEENT;
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Ctx.reportError(Loc, "Only PC-relative INDNTPOFF accesses are supported for now");
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return 0;
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case MCSymbolRefExpr::VK_DTPOFF:
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assert(!IsPCRel && "DTPOFF shouldn't be PC-relative");
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return getTLSLDOReloc(Ctx, Loc, Kind);
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case MCSymbolRefExpr::VK_TLSLDM:
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assert(!IsPCRel && "TLSLDM shouldn't be PC-relative");
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return getTLSLDMReloc(Ctx, Loc, Kind);
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case MCSymbolRefExpr::VK_TLSGD:
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assert(!IsPCRel && "TLSGD shouldn't be PC-relative");
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return getTLSGDReloc(Ctx, Loc, 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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Ctx.reportError(Loc, "Only PC-relative GOT accesses are supported for now");
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return 0;
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case MCSymbolRefExpr::VK_PLT:
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assert(IsPCRel && "@PLT shouldn't be PC-relative");
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return getPLTReloc(Ctx, Loc, 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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std::unique_ptr<MCObjectTargetWriter>
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llvm::createSystemZObjectWriter(uint8_t OSABI) {
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return std::make_unique<SystemZObjectWriter>(OSABI);
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}
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