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//===-- ARMWinCOFFObjectWriter.cpp - ARM Windows COFF Object Writer -- C++ -==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/ARMFixupKinds.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/COFF.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCValue.h"
#include "llvm/MC/MCWinCOFFObjectWriter.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
using namespace llvm;
namespace {
class ARMWinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
public:
ARMWinCOFFObjectWriter()
: MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_ARMNT) {
}
~ARMWinCOFFObjectWriter() override = default;
unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
const MCFixup &Fixup, bool IsCrossSection,
const MCAsmBackend &MAB) const override;
bool recordRelocation(const MCFixup &) const override;
};
} // end anonymous namespace
unsigned ARMWinCOFFObjectWriter::getRelocType(MCContext &Ctx,
const MCValue &Target,
const MCFixup &Fixup,
bool IsCrossSection,
const MCAsmBackend &MAB) const {
MCSymbolRefExpr::VariantKind Modifier =
Target.isAbsolute() ? MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
unsigned FixupKind = Fixup.getKind();
if (IsCrossSection) {
if (FixupKind != FK_Data_4) {
Ctx.reportError(Fixup.getLoc(), "Cannot represent this expression");
return COFF::IMAGE_REL_ARM_ADDR32;
}
FixupKind = FK_PCRel_4;
}
switch (FixupKind) {
default: {
const MCFixupKindInfo &Info = MAB.getFixupKindInfo(Fixup.getKind());
report_fatal_error(Twine("unsupported relocation type: ") + Info.Name);
}
case FK_Data_4:
switch (Modifier) {
case MCSymbolRefExpr::VK_COFF_IMGREL32:
return COFF::IMAGE_REL_ARM_ADDR32NB;
case MCSymbolRefExpr::VK_SECREL:
return COFF::IMAGE_REL_ARM_SECREL;
default:
return COFF::IMAGE_REL_ARM_ADDR32;
}
case FK_PCRel_4:
return COFF::IMAGE_REL_ARM_REL32;
case FK_SecRel_2:
return COFF::IMAGE_REL_ARM_SECTION;
case FK_SecRel_4:
return COFF::IMAGE_REL_ARM_SECREL;
case ARM::fixup_t2_condbranch:
return COFF::IMAGE_REL_ARM_BRANCH20T;
case ARM::fixup_t2_uncondbranch:
case ARM::fixup_arm_thumb_bl:
return COFF::IMAGE_REL_ARM_BRANCH24T;
case ARM::fixup_arm_thumb_blx:
return COFF::IMAGE_REL_ARM_BLX23T;
case ARM::fixup_t2_movw_lo16:
case ARM::fixup_t2_movt_hi16:
return COFF::IMAGE_REL_ARM_MOV32T;
}
}
bool ARMWinCOFFObjectWriter::recordRelocation(const MCFixup &Fixup) const {
return static_cast<unsigned>(Fixup.getKind()) != ARM::fixup_t2_movt_hi16;
}
namespace llvm {
std::unique_ptr<MCObjectTargetWriter>
createARMWinCOFFObjectWriter() {
return std::make_unique<ARMWinCOFFObjectWriter>();
}
} // end namespace llvm
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