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 MCValue &Val, const MCSymbol &Sym,
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 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 
90 std::unique_ptr<MCObjectTargetWriter>
91 llvm::createLanaiELFObjectWriter(uint8_t OSABI) {
92   return std::make_unique<LanaiELFObjectWriter>(OSABI);
93 }
94