b19b6d9fab
Similar to previous migration done for other targets (PowerPC, X86, ARM, etc). Switch from the confusing VariantKind to Specifier, which aligns with Arm and IBM AIX's documentation. In addition, rename *MCExpr::getKind, which confusingly shadows the base class getKind. In the future, relocation specifiers should be encoded as part of SystemZMCExpr instead of MCSymbolRefExpr.
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.getAccessVariant());
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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 *S = Target.getSymA())
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cast<MCSymbolELF>(S->getSymbol()).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 (getSpecifier(V.getSymA())) {
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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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