LanaiELFObjectWriter.cpp

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//===-- LanaiELFObjectWriter.cpp - Lanai ELF Writer -----------------------===//
//
// 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/LanaiBaseInfo.h"
#include "MCTargetDesc/LanaiFixupKinds.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/Support/ErrorHandling.h"
 
using namespace llvm;
 
namespace {
 
class LanaiELFObjectWriter : public MCELFObjectTargetWriter {
public:
  explicit LanaiELFObjectWriter(uint8_t OSABI);
 
  ~LanaiELFObjectWriter() override = default;
 
protected:
  unsigned getRelocType(const MCFixup &, const MCValue &,
                        bool IsPCRel) const override;
  bool needsRelocateWithSymbol(const MCValue &, unsigned Type) const override;
};
 
} // end anonymous namespace
 
LanaiELFObjectWriter::LanaiELFObjectWriter(uint8_t OSABI)
    : MCELFObjectTargetWriter(/*Is64Bit_=*/false, OSABI, ELF::EM_LANAI,
                              /*HasRelocationAddend_=*/true) {}
 
unsigned LanaiELFObjectWriter::getRelocType(const MCFixup &Fixup,
                                            const MCValue &, bool) const {
  unsigned Type;
  unsigned Kind = static_cast<unsigned>(Fixup.getKind());
  switch (Kind) {
  case Lanai::FIXUP_LANAI_21:
    Type = ELF::R_LANAI_21;
    break;
  case Lanai::FIXUP_LANAI_21_F:
    Type = ELF::R_LANAI_21_F;
    break;
  case Lanai::FIXUP_LANAI_25:
    Type = ELF::R_LANAI_25;
    break;
  case Lanai::FIXUP_LANAI_32:
  case FK_Data_4:
    Type = ELF::R_LANAI_32;
    break;
  case Lanai::FIXUP_LANAI_HI16:
    Type = ELF::R_LANAI_HI16;
    break;
  case Lanai::FIXUP_LANAI_LO16:
    Type = ELF::R_LANAI_LO16;
    break;
  case Lanai::FIXUP_LANAI_NONE:
    Type = ELF::R_LANAI_NONE;
    break;
 
  default:
    llvm_unreachable("Invalid fixup kind!");
  }
  return Type;
}
 
bool LanaiELFObjectWriter::needsRelocateWithSymbol(const MCValue &,
                                                   unsigned Type) const {
  switch (Type) {
  case ELF::R_LANAI_21:
  case ELF::R_LANAI_21_F:
  case ELF::R_LANAI_25:
  case ELF::R_LANAI_32:
  case ELF::R_LANAI_HI16:
    return true;
  default:
    return false;
  }
}
 
std::unique_ptr<MCObjectTargetWriter>
llvm::createLanaiELFObjectWriter(uint8_t OSABI) {
  return std::make_unique<LanaiELFObjectWriter>(OSABI);
}