1 //===-- ARMWinCOFFObjectWriter.cpp - ARM Windows COFF Object Writer -- C++ -==//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "MCTargetDesc/ARMFixupKinds.h"
10 #include "llvm/ADT/Twine.h"
11 #include "llvm/BinaryFormat/COFF.h"
12 #include "llvm/MC/MCAsmBackend.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCFixup.h"
16 #include "llvm/MC/MCFixupKindInfo.h"
17 #include "llvm/MC/MCObjectWriter.h"
18 #include "llvm/MC/MCValue.h"
19 #include "llvm/MC/MCWinCOFFObjectWriter.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/raw_ostream.h"
28 class ARMWinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
30 ARMWinCOFFObjectWriter()
31 : MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_ARMNT) {
34 ~ARMWinCOFFObjectWriter() override = default;
36 unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
37 const MCFixup &Fixup, bool IsCrossSection,
38 const MCAsmBackend &MAB) const override;
40 bool recordRelocation(const MCFixup &) const override;
43 } // end anonymous namespace
45 unsigned ARMWinCOFFObjectWriter::getRelocType(MCContext &Ctx,
46 const MCValue &Target,
49 const MCAsmBackend &MAB) const {
50 MCSymbolRefExpr::VariantKind Modifier =
51 Target.isAbsolute() ? MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
53 unsigned FixupKind = Fixup.getKind();
55 if (FixupKind != FK_Data_4) {
56 Ctx.reportError(Fixup.getLoc(), "Cannot represent this expression");
57 return COFF::IMAGE_REL_ARM_ADDR32;
59 FixupKind = FK_PCRel_4;
65 const MCFixupKindInfo &Info = MAB.getFixupKindInfo(Fixup.getKind());
66 report_fatal_error(Twine("unsupported relocation type: ") + Info.Name);
70 case MCSymbolRefExpr::VK_COFF_IMGREL32:
71 return COFF::IMAGE_REL_ARM_ADDR32NB;
72 case MCSymbolRefExpr::VK_SECREL:
73 return COFF::IMAGE_REL_ARM_SECREL;
75 return COFF::IMAGE_REL_ARM_ADDR32;
78 return COFF::IMAGE_REL_ARM_REL32;
80 return COFF::IMAGE_REL_ARM_SECTION;
82 return COFF::IMAGE_REL_ARM_SECREL;
83 case ARM::fixup_t2_condbranch:
84 return COFF::IMAGE_REL_ARM_BRANCH20T;
85 case ARM::fixup_t2_uncondbranch:
86 case ARM::fixup_arm_thumb_bl:
87 return COFF::IMAGE_REL_ARM_BRANCH24T;
88 case ARM::fixup_arm_thumb_blx:
89 return COFF::IMAGE_REL_ARM_BLX23T;
90 case ARM::fixup_t2_movw_lo16:
91 case ARM::fixup_t2_movt_hi16:
92 return COFF::IMAGE_REL_ARM_MOV32T;
96 bool ARMWinCOFFObjectWriter::recordRelocation(const MCFixup &Fixup) const {
97 return static_cast<unsigned>(Fixup.getKind()) != ARM::fixup_t2_movt_hi16;
102 std::unique_ptr<MCObjectTargetWriter>
103 createARMWinCOFFObjectWriter() {
104 return std::make_unique<ARMWinCOFFObjectWriter>();
107 } // end namespace llvm