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https://github.com/llvm/llvm-project.git
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8fa5b6cc02
Commit 52eb11f925ddeba4e1b3840fd636ee87387f3ada temporarily introduced getSymSpecifier to prepare for "MCValue: Replace MCSymbolRefExpr members with MCSymbol" (d5893fc2a7e1191afdb4940469ec9371a319b114). The refactoring is now complete.
236 lines
7.6 KiB
C++
236 lines
7.6 KiB
C++
//===-- SystemZELFObjectWriter.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/SystemZMCExpr.h"
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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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#include <memory>
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using namespace llvm;
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namespace {
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class SystemZELFObjectWriter : public MCELFObjectTargetWriter {
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public:
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SystemZELFObjectWriter(uint8_t OSABI);
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~SystemZELFObjectWriter() 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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bool needsRelocateWithSymbol(const MCValue &Val, const MCSymbol &Sym,
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unsigned Type) const override;
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};
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} // end anonymous namespace
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SystemZELFObjectWriter::SystemZELFObjectWriter(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:
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case SystemZ::FK_390_U8Imm:
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case SystemZ::FK_390_S8Imm:
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return ELF::R_390_8;
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case SystemZ::FK_390_U12Imm:
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return ELF::R_390_12;
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case FK_Data_2:
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case SystemZ::FK_390_U16Imm:
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case SystemZ::FK_390_S16Imm:
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return ELF::R_390_16;
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case SystemZ::FK_390_S20Imm:
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return ELF::R_390_20;
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case FK_Data_4:
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case SystemZ::FK_390_U32Imm:
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case SystemZ::FK_390_S32Imm:
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return ELF::R_390_32;
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case FK_Data_8:
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return ELF::R_390_64;
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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:
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case SystemZ::FK_390_U16Imm:
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case SystemZ::FK_390_S16Imm:
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return ELF::R_390_PC16;
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case FK_Data_4:
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case SystemZ::FK_390_U32Imm:
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case SystemZ::FK_390_S32Imm:
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return ELF::R_390_PC32;
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case FK_Data_8:
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return ELF::R_390_PC64;
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case SystemZ::FK_390_PC12DBL:
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return ELF::R_390_PC12DBL;
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case SystemZ::FK_390_PC16DBL:
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return ELF::R_390_PC16DBL;
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case SystemZ::FK_390_PC24DBL:
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return ELF::R_390_PC24DBL;
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case SystemZ::FK_390_PC32DBL:
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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 SystemZELFObjectWriter::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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auto Specifier = SystemZMCExpr::Specifier(Target.getSpecifier());
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switch (Specifier) {
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case SystemZMCExpr::VK_INDNTPOFF:
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case SystemZMCExpr::VK_NTPOFF:
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case SystemZMCExpr::VK_TLSGD:
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case SystemZMCExpr::VK_TLSLD:
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case SystemZMCExpr::VK_TLSLDM:
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case SystemZMCExpr::VK_DTPOFF:
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if (auto *SA = Target.getAddSym())
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cast<MCSymbolELF>(SA)->setType(ELF::STT_TLS);
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break;
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default:
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break;
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}
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switch (Specifier) {
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case SystemZMCExpr::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 SystemZMCExpr::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 SystemZMCExpr::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 SystemZMCExpr::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 SystemZMCExpr::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 SystemZMCExpr::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 SystemZMCExpr::VK_GOT:
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case SystemZMCExpr::VK_GOTENT:
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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 SystemZMCExpr::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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bool SystemZELFObjectWriter::needsRelocateWithSymbol(const MCValue &V,
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const MCSymbol &Sym,
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unsigned Type) const {
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switch (V.getSpecifier()) {
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case SystemZMCExpr::VK_GOT:
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case SystemZMCExpr::VK_PLT:
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return true;
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default:
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return false;
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}
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}
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std::unique_ptr<MCObjectTargetWriter>
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llvm::createSystemZELFObjectWriter(uint8_t OSABI) {
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return std::make_unique<SystemZELFObjectWriter>(OSABI);
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}
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