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//= AArch64WinCOFFObjectWriter.cpp - AArch64 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 "AArch64MCTargetDesc.h"
#include "MCTargetDesc/AArch64FixupKinds.h"
#include "MCTargetDesc/AArch64MCExpr.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 AArch64WinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
public:
AArch64WinCOFFObjectWriter()
: MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_ARM64) {}
~AArch64WinCOFFObjectWriter() 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 AArch64WinCOFFObjectWriter::getRelocType(
MCContext &Ctx, const MCValue &Target, const MCFixup &Fixup,
bool IsCrossSection, const MCAsmBackend &MAB) const {
unsigned FixupKind = Fixup.getKind();
if (IsCrossSection) {
// IMAGE_REL_ARM64_REL64 does not exist. We treat FK_Data_8 as FK_PCRel_4 so
// that .xword a-b can lower to IMAGE_REL_ARM64_REL32. This allows generic
// instrumentation to not bother with the COFF limitation. A negative value
// needs attention.
if (FixupKind != FK_Data_4 && FixupKind != FK_Data_8) {
Ctx.reportError(Fixup.getLoc(), "Cannot represent this expression");
return COFF::IMAGE_REL_ARM64_ADDR32;
}
FixupKind = FK_PCRel_4;
}
auto Modifier = Target.isAbsolute() ? MCSymbolRefExpr::VK_None
: Target.getSymA()->getKind();
const MCExpr *Expr = Fixup.getValue();
if (const AArch64MCExpr *A64E = dyn_cast<AArch64MCExpr>(Expr)) {
AArch64MCExpr::VariantKind RefKind = A64E->getKind();
switch (AArch64MCExpr::getSymbolLoc(RefKind)) {
case AArch64MCExpr::VK_ABS:
case AArch64MCExpr::VK_SECREL:
// Supported
break;
default:
Ctx.reportError(Fixup.getLoc(), "relocation variant " +
A64E->getVariantKindName() +
" unsupported on COFF targets");
return COFF::IMAGE_REL_ARM64_ABSOLUTE; // Dummy return value
}
}
switch (FixupKind) {
default: {
if (const AArch64MCExpr *A64E = dyn_cast<AArch64MCExpr>(Expr)) {
Ctx.reportError(Fixup.getLoc(), "relocation type " +
A64E->getVariantKindName() +
" unsupported on COFF targets");
} else {
const MCFixupKindInfo &Info = MAB.getFixupKindInfo(Fixup.getKind());
Ctx.reportError(Fixup.getLoc(), Twine("relocation type ") + Info.Name +
" unsupported on COFF targets");
}
return COFF::IMAGE_REL_ARM64_ABSOLUTE; // Dummy return value
}
case FK_PCRel_4:
return COFF::IMAGE_REL_ARM64_REL32;
case FK_Data_4:
switch (Modifier) {
default:
return COFF::IMAGE_REL_ARM64_ADDR32;
case MCSymbolRefExpr::VK_COFF_IMGREL32:
return COFF::IMAGE_REL_ARM64_ADDR32NB;
case MCSymbolRefExpr::VK_SECREL:
return COFF::IMAGE_REL_ARM64_SECREL;
}
case FK_Data_8:
return COFF::IMAGE_REL_ARM64_ADDR64;
case FK_SecRel_2:
return COFF::IMAGE_REL_ARM64_SECTION;
case FK_SecRel_4:
return COFF::IMAGE_REL_ARM64_SECREL;
case AArch64::fixup_aarch64_add_imm12:
if (const AArch64MCExpr *A64E = dyn_cast<AArch64MCExpr>(Expr)) {
AArch64MCExpr::VariantKind RefKind = A64E->getKind();
if (RefKind == AArch64MCExpr::VK_SECREL_LO12)
return COFF::IMAGE_REL_ARM64_SECREL_LOW12A;
if (RefKind == AArch64MCExpr::VK_SECREL_HI12)
return COFF::IMAGE_REL_ARM64_SECREL_HIGH12A;
}
return COFF::IMAGE_REL_ARM64_PAGEOFFSET_12A;
case AArch64::fixup_aarch64_ldst_imm12_scale1:
case AArch64::fixup_aarch64_ldst_imm12_scale2:
case AArch64::fixup_aarch64_ldst_imm12_scale4:
case AArch64::fixup_aarch64_ldst_imm12_scale8:
case AArch64::fixup_aarch64_ldst_imm12_scale16:
if (const AArch64MCExpr *A64E = dyn_cast<AArch64MCExpr>(Expr)) {
AArch64MCExpr::VariantKind RefKind = A64E->getKind();
if (RefKind == AArch64MCExpr::VK_SECREL_LO12)
return COFF::IMAGE_REL_ARM64_SECREL_LOW12L;
}
return COFF::IMAGE_REL_ARM64_PAGEOFFSET_12L;
case AArch64::fixup_aarch64_pcrel_adr_imm21:
return COFF::IMAGE_REL_ARM64_REL21;
case AArch64::fixup_aarch64_pcrel_adrp_imm21:
return COFF::IMAGE_REL_ARM64_PAGEBASE_REL21;
case AArch64::fixup_aarch64_pcrel_branch14:
return COFF::IMAGE_REL_ARM64_BRANCH14;
case AArch64::fixup_aarch64_pcrel_branch19:
return COFF::IMAGE_REL_ARM64_BRANCH19;
case AArch64::fixup_aarch64_pcrel_branch26:
case AArch64::fixup_aarch64_pcrel_call26:
return COFF::IMAGE_REL_ARM64_BRANCH26;
}
}
bool AArch64WinCOFFObjectWriter::recordRelocation(const MCFixup &Fixup) const {
return true;
}
std::unique_ptr<MCObjectTargetWriter> llvm::createAArch64WinCOFFObjectWriter() {
return std::make_unique<AArch64WinCOFFObjectWriter>();
}
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