| //===-- 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 |