XtensaELFObjectWriter.cpp

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//===-- XtensaMCObjectWriter.cpp - Xtensa ELF writer ----------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// 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/XtensaMCAsmInfo.h"
#include "MCTargetDesc/XtensaMCTargetDesc.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <cstdint>
 
using namespace llvm;
 
namespace {
class XtensaObjectWriter : public MCELFObjectTargetWriter {
public:
  XtensaObjectWriter(uint8_t OSABI);
 
  virtual ~XtensaObjectWriter();
 
protected:
  unsigned getRelocType(const MCFixup &, const MCValue &,
                        bool IsPCRel) const override;
  bool needsRelocateWithSymbol(const MCValue &, unsigned Type) const override;
};
} // namespace
 
XtensaObjectWriter::XtensaObjectWriter(uint8_t OSABI)
    : MCELFObjectTargetWriter(false, OSABI, ELF::EM_XTENSA,
                              /*HasRelocationAddend=*/true) {}
 
XtensaObjectWriter::~XtensaObjectWriter() {}
 
unsigned XtensaObjectWriter::getRelocType(const MCFixup &Fixup,
                                          const MCValue &Target,
                                          bool IsPCRel) const {
  uint8_t Specifier = Target.getSpecifier();
 
  switch ((unsigned)Fixup.getKind()) {
  case FK_Data_4:
    return Specifier == Xtensa::S_TPOFF ? ELF::R_XTENSA_TLS_TPOFF
                                        : ELF::R_XTENSA_32;
  default:
    return ELF::R_XTENSA_SLOT0_OP;
  }
}
 
std::unique_ptr<MCObjectTargetWriter>
llvm::createXtensaObjectWriter(uint8_t OSABI, bool IsLittleEndian) {
  return std::make_unique<XtensaObjectWriter>(OSABI);
}
 
bool XtensaObjectWriter::needsRelocateWithSymbol(const MCValue &,
                                                 unsigned Type) const {
  return false;
}