lib/Target/Lanai/MCTargetDesc/LanaiELFObjectWriter.cpp

   1 //===-- LanaiELFObjectWriter.cpp - Lanai ELF Writer -----------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "MCTargetDesc/LanaiBaseInfo.h"
  10 #include "MCTargetDesc/LanaiFixupKinds.h"
  11 #include "llvm/BinaryFormat/ELF.h"
  12 #include "llvm/MC/MCELFObjectWriter.h"
  13 #include "llvm/MC/MCObjectWriter.h"
  14 #include "llvm/Support/ErrorHandling.h"
  15
  16 using namespace llvm;
  17
  18 namespace {
  19
  20 class LanaiELFObjectWriter : public MCELFObjectTargetWriter {
  21 public:
  22   explicit LanaiELFObjectWriter(uint8_t OSABI);
  23
  24   ~LanaiELFObjectWriter() override = default;
  25
  26 protected:
  27   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
  28                         const MCFixup &Fixup, bool IsPCRel) const override;
  29   bool needsRelocateWithSymbol(const MCSymbol &SD,
  30                                unsigned Type) const override;
  31 };
  32
  33 } // end anonymous namespace
  34
  35 LanaiELFObjectWriter::LanaiELFObjectWriter(uint8_t OSABI)
  36     : MCELFObjectTargetWriter(/*Is64Bit_=*/false, OSABI, ELF::EM_LANAI,
  37                               /*HasRelocationAddend_=*/true) {}
  38
  39 unsigned LanaiELFObjectWriter::getRelocType(MCContext & /*Ctx*/,
  40                                             const MCValue & /*Target*/,
  41                                             const MCFixup &Fixup,
  42                                             bool /*IsPCRel*/) const {
  43   unsigned Type;
  44   unsigned Kind = static_cast<unsigned>(Fixup.getKind());
  45   switch (Kind) {
  46   case Lanai::FIXUP_LANAI_21:
  47     Type = ELF::R_LANAI_21;
  48     break;
  49   case Lanai::FIXUP_LANAI_21_F:
  50     Type = ELF::R_LANAI_21_F;
  51     break;
  52   case Lanai::FIXUP_LANAI_25:
  53     Type = ELF::R_LANAI_25;
  54     break;
  55   case Lanai::FIXUP_LANAI_32:
  56   case FK_Data_4:
  57     Type = ELF::R_LANAI_32;
  58     break;
  59   case Lanai::FIXUP_LANAI_HI16:
  60     Type = ELF::R_LANAI_HI16;
  61     break;
  62   case Lanai::FIXUP_LANAI_LO16:
  63     Type = ELF::R_LANAI_LO16;
  64     break;
  65   case Lanai::FIXUP_LANAI_NONE:
  66     Type = ELF::R_LANAI_NONE;
  67     break;
  68
  69   default:
  70     llvm_unreachable("Invalid fixup kind!");
  71   }
  72   return Type;
  73 }
  74
  75 bool LanaiELFObjectWriter::needsRelocateWithSymbol(const MCSymbol & /*SD*/,
  76                                                    unsigned Type) const {
  77   switch (Type) {
  78   case ELF::R_LANAI_21:
  79   case ELF::R_LANAI_21_F:
  80   case ELF::R_LANAI_25:
  81   case ELF::R_LANAI_32:
  82   case ELF::R_LANAI_HI16:
  83     return true;
  84   default:
  85     return false;
  86   }
  87 }
  88
  89 std::unique_ptr<MCObjectTargetWriter>
  90 llvm::createLanaiELFObjectWriter(uint8_t OSABI) {
  91   return std::make_unique<LanaiELFObjectWriter>(OSABI);
  92 }