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//===-- M68kELFObjectWriter.cpp - M68k ELF 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains definitions for M68k ELF Writers
///
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/M68kFixupKinds.h"
#include "MCTargetDesc/M68kMCTargetDesc.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
namespace {
class M68kELFObjectWriter : public MCELFObjectTargetWriter {
public:
M68kELFObjectWriter(uint8_t OSABI);
~M68kELFObjectWriter() override;
protected:
unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
const MCFixup &Fixup, bool IsPCRel) const override;
};
} // namespace
M68kELFObjectWriter::M68kELFObjectWriter(uint8_t OSABI)
: MCELFObjectTargetWriter(false, OSABI, ELF::EM_68K, /* RELA */ true) {}
M68kELFObjectWriter::~M68kELFObjectWriter() {}
enum M68kRelType { RT_32, RT_16, RT_8 };
static M68kRelType
getType(unsigned Kind, MCSymbolRefExpr::VariantKind &Modifier, bool &IsPCRel) {
switch (Kind) {
case FK_Data_4:
case FK_PCRel_4:
return RT_32;
case FK_PCRel_2:
case FK_Data_2:
return RT_16;
case FK_PCRel_1:
case FK_Data_1:
return RT_8;
}
llvm_unreachable("Unimplemented");
}
unsigned M68kELFObjectWriter::getRelocType(MCContext &Ctx,
const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
unsigned Kind = Fixup.getKind();
M68kRelType Type = getType(Kind, Modifier, IsPCRel);
switch (Modifier) {
default:
llvm_unreachable("Unimplemented");
case MCSymbolRefExpr::VK_None:
switch (Type) {
case RT_32:
return IsPCRel ? ELF::R_68K_PC32 : ELF::R_68K_32;
case RT_16:
return IsPCRel ? ELF::R_68K_PC16 : ELF::R_68K_16;
case RT_8:
return IsPCRel ? ELF::R_68K_PC8 : ELF::R_68K_8;
}
llvm_unreachable("Unrecognized size");
case MCSymbolRefExpr::VK_GOTPCREL:
switch (Type) {
case RT_32:
return ELF::R_68K_GOTPCREL32;
case RT_16:
return ELF::R_68K_GOTPCREL16;
case RT_8:
return ELF::R_68K_GOTPCREL8;
}
llvm_unreachable("Unrecognized size");
case MCSymbolRefExpr::VK_GOTOFF:
assert(!IsPCRel);
switch (Type) {
case RT_32:
return ELF::R_68K_GOTOFF32;
case RT_16:
return ELF::R_68K_GOTOFF16;
case RT_8:
return ELF::R_68K_GOTOFF8;
}
llvm_unreachable("Unrecognized size");
case MCSymbolRefExpr::VK_PLT:
switch (Type) {
case RT_32:
return ELF::R_68K_PLT32;
case RT_16:
return ELF::R_68K_PLT16;
case RT_8:
return ELF::R_68K_PLT8;
}
llvm_unreachable("Unrecognized size");
}
}
std::unique_ptr<MCObjectTargetWriter>
llvm::createM68kELFObjectWriter(uint8_t OSABI) {
return std::make_unique<M68kELFObjectWriter>(OSABI);
}
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