xref: /freebsd-src/contrib/llvm-project/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFObjectWriter.cpp (revision 972a253a57b6f144b0e4a3e2080a2a0076ec55a0)

//===-- LoongArchELFObjectWriter.cpp - LoongArch 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
//
//===----------------------------------------------------------------------===//

#include "MCTargetDesc/LoongArchMCTargetDesc.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/Support/ErrorHandling.h"

using namespace llvm;

namespace {
class LoongArchELFObjectWriter : public MCELFObjectTargetWriter {
public:
  LoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit);

  ~LoongArchELFObjectWriter() override;

  // Return true if the given relocation must be with a symbol rather than
  // section plus offset.
  bool needsRelocateWithSymbol(const MCSymbol &Sym,
                               unsigned Type) const override {
    return true;
  }

protected:
  unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
                        const MCFixup &Fixup, bool IsPCRel) const override;
};
} // end namespace

LoongArchELFObjectWriter::LoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit)
    : MCELFObjectTargetWriter(Is64Bit, OSABI, ELF::EM_LOONGARCH,
                              /*HasRelocationAddend*/ true) {}

LoongArchELFObjectWriter::~LoongArchELFObjectWriter() {}

unsigned LoongArchELFObjectWriter::getRelocType(MCContext &Ctx,
                                                const MCValue &Target,
                                                const MCFixup &Fixup,
                                                bool IsPCRel) const {
  // Determine the type of the relocation
  unsigned Kind = Fixup.getTargetKind();

  if (Kind >= FirstLiteralRelocationKind)
    return Kind - FirstLiteralRelocationKind;

  switch (Kind) {
  // TODO: Implement this when we defined fixup kind.
  default:
    return ELF::R_LARCH_NONE;
  }
}

std::unique_ptr<MCObjectTargetWriter>
llvm::createLoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit) {
  return std::make_unique<LoongArchELFObjectWriter>(OSABI, Is64Bit);
}