2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
114 lines
4.1 KiB
C++
114 lines
4.1 KiB
C++
//===-- X86WinCOFFObjectWriter.cpp - X86 Win COFF 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/X86FixupKinds.h"
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#include "MCTargetDesc/X86MCTargetDesc.h"
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#include "llvm/BinaryFormat/COFF.h"
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#include "llvm/MC/MCContext.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/MC/MCWinCOFFObjectWriter.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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namespace {
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class X86WinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
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public:
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X86WinCOFFObjectWriter(bool Is64Bit);
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~X86WinCOFFObjectWriter() override = default;
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unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
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const MCFixup &Fixup, bool IsCrossSection,
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const MCAsmBackend &MAB) const override;
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};
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} // end anonymous namespace
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X86WinCOFFObjectWriter::X86WinCOFFObjectWriter(bool Is64Bit)
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: MCWinCOFFObjectTargetWriter(Is64Bit ? COFF::IMAGE_FILE_MACHINE_AMD64
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: COFF::IMAGE_FILE_MACHINE_I386) {}
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unsigned X86WinCOFFObjectWriter::getRelocType(MCContext &Ctx,
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const MCValue &Target,
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const MCFixup &Fixup,
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bool IsCrossSection,
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const MCAsmBackend &MAB) const {
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unsigned FixupKind = Fixup.getKind();
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if (IsCrossSection) {
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if (FixupKind != FK_Data_4 && FixupKind != llvm::X86::reloc_signed_4byte) {
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Ctx.reportError(Fixup.getLoc(), "Cannot represent this expression");
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return COFF::IMAGE_REL_AMD64_ADDR32;
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}
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FixupKind = FK_PCRel_4;
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}
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MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
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MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
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if (getMachine() == COFF::IMAGE_FILE_MACHINE_AMD64) {
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switch (FixupKind) {
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case FK_PCRel_4:
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case X86::reloc_riprel_4byte:
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case X86::reloc_riprel_4byte_movq_load:
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case X86::reloc_riprel_4byte_relax:
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case X86::reloc_riprel_4byte_relax_rex:
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case X86::reloc_branch_4byte_pcrel:
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return COFF::IMAGE_REL_AMD64_REL32;
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case FK_Data_4:
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case X86::reloc_signed_4byte:
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case X86::reloc_signed_4byte_relax:
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if (Modifier == MCSymbolRefExpr::VK_COFF_IMGREL32)
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return COFF::IMAGE_REL_AMD64_ADDR32NB;
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if (Modifier == MCSymbolRefExpr::VK_SECREL)
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return COFF::IMAGE_REL_AMD64_SECREL;
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return COFF::IMAGE_REL_AMD64_ADDR32;
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case FK_Data_8:
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return COFF::IMAGE_REL_AMD64_ADDR64;
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case FK_SecRel_2:
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return COFF::IMAGE_REL_AMD64_SECTION;
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case FK_SecRel_4:
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return COFF::IMAGE_REL_AMD64_SECREL;
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default:
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Ctx.reportError(Fixup.getLoc(), "unsupported relocation type");
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return COFF::IMAGE_REL_AMD64_ADDR32;
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}
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} else if (getMachine() == COFF::IMAGE_FILE_MACHINE_I386) {
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switch (FixupKind) {
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case FK_PCRel_4:
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case X86::reloc_riprel_4byte:
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case X86::reloc_riprel_4byte_movq_load:
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return COFF::IMAGE_REL_I386_REL32;
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case FK_Data_4:
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case X86::reloc_signed_4byte:
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case X86::reloc_signed_4byte_relax:
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if (Modifier == MCSymbolRefExpr::VK_COFF_IMGREL32)
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return COFF::IMAGE_REL_I386_DIR32NB;
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if (Modifier == MCSymbolRefExpr::VK_SECREL)
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return COFF::IMAGE_REL_AMD64_SECREL;
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return COFF::IMAGE_REL_I386_DIR32;
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case FK_SecRel_2:
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return COFF::IMAGE_REL_I386_SECTION;
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case FK_SecRel_4:
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return COFF::IMAGE_REL_I386_SECREL;
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default:
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Ctx.reportError(Fixup.getLoc(), "unsupported relocation type");
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return COFF::IMAGE_REL_I386_DIR32;
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}
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} else
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llvm_unreachable("Unsupported COFF machine type.");
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}
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std::unique_ptr<MCObjectTargetWriter>
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llvm::createX86WinCOFFObjectWriter(bool Is64Bit) {
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return llvm::make_unique<X86WinCOFFObjectWriter>(Is64Bit);
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}
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