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
16using namespace llvm;
17
18namespace {
19
20class LanaiELFObjectWriter : public MCELFObjectTargetWriter {
21public:
22  explicit LanaiELFObjectWriter(uint8_t OSABI);
23
24  ~LanaiELFObjectWriter() override = default;
25
26protected:
27  unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
28                        const MCFixup &Fixup, bool IsPCRel) const override;
29  bool needsRelocateWithSymbol(const MCValue &Val, const MCSymbol &Sym,
30                               unsigned Type) const override;
31};
32
33} // end anonymous namespace
34
35LanaiELFObjectWriter::LanaiELFObjectWriter(uint8_t OSABI)
36    : MCELFObjectTargetWriter(/*Is64Bit_=*/false, OSABI, ELF::EM_LANAI,
37                              /*HasRelocationAddend_=*/true) {}
38
39unsigned 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
75bool LanaiELFObjectWriter::needsRelocateWithSymbol(const MCValue &,
76                                                   const MCSymbol &,
77                                                   unsigned Type) const {
78  switch (Type) {
79  case ELF::R_LANAI_21:
80  case ELF::R_LANAI_21_F:
81  case ELF::R_LANAI_25:
82  case ELF::R_LANAI_32:
83  case ELF::R_LANAI_HI16:
84    return true;
85  default:
86    return false;
87  }
88}
89
90std::unique_ptr<MCObjectTargetWriter>
91llvm::createLanaiELFObjectWriter(uint8_t OSABI) {
92  return std::make_unique<LanaiELFObjectWriter>(OSABI);
93}
94