1 //===-- LoongArchELFObjectWriter.cpp - LoongArch ELF Writer ---*- C++ -*---===//
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/LoongArchFixupKinds.h"
10 #include "MCTargetDesc/LoongArchMCTargetDesc.h"
11 #include "llvm/BinaryFormat/ELF.h"
12 #include "llvm/MC/MCContext.h"
13 #include "llvm/MC/MCELFObjectWriter.h"
14 #include "llvm/MC/MCFixup.h"
15 #include "llvm/MC/MCObjectWriter.h"
16 #include "llvm/Support/ErrorHandling.h"
17
18 using namespace llvm;
19
20 namespace {
21 class LoongArchELFObjectWriter : public MCELFObjectTargetWriter {
22 public:
23 LoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit);
24
25 ~LoongArchELFObjectWriter() override;
26
27 protected:
28 unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
29 const MCFixup &Fixup, bool IsPCRel) const override;
30 };
31 } // end namespace
32
LoongArchELFObjectWriter(uint8_t OSABI,bool Is64Bit)33 LoongArchELFObjectWriter::LoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit)
34 : MCELFObjectTargetWriter(Is64Bit, OSABI, ELF::EM_LOONGARCH,
35 /*HasRelocationAddend*/ true) {}
36
~LoongArchELFObjectWriter()37 LoongArchELFObjectWriter::~LoongArchELFObjectWriter() {}
38
getRelocType(MCContext & Ctx,const MCValue & Target,const MCFixup & Fixup,bool IsPCRel) const39 unsigned LoongArchELFObjectWriter::getRelocType(MCContext &Ctx,
40 const MCValue &Target,
41 const MCFixup &Fixup,
42 bool IsPCRel) const {
43 // Determine the type of the relocation
44 unsigned Kind = Fixup.getTargetKind();
45
46 if (Kind >= FirstLiteralRelocationKind)
47 return Kind - FirstLiteralRelocationKind;
48
49 switch (Kind) {
50 default:
51 Ctx.reportError(Fixup.getLoc(), "Unsupported relocation type");
52 return ELF::R_LARCH_NONE;
53 case FK_Data_1:
54 Ctx.reportError(Fixup.getLoc(), "1-byte data relocations not supported");
55 return ELF::R_LARCH_NONE;
56 case FK_Data_2:
57 Ctx.reportError(Fixup.getLoc(), "2-byte data relocations not supported");
58 return ELF::R_LARCH_NONE;
59 case FK_Data_4:
60 return IsPCRel ? ELF::R_LARCH_32_PCREL : ELF::R_LARCH_32;
61 case FK_Data_8:
62 return ELF::R_LARCH_64;
63 case LoongArch::fixup_loongarch_b16:
64 return ELF::R_LARCH_B16;
65 case LoongArch::fixup_loongarch_b21:
66 return ELF::R_LARCH_B21;
67 case LoongArch::fixup_loongarch_b26:
68 return ELF::R_LARCH_B26;
69 case LoongArch::fixup_loongarch_abs_hi20:
70 return ELF::R_LARCH_ABS_HI20;
71 case LoongArch::fixup_loongarch_abs_lo12:
72 return ELF::R_LARCH_ABS_LO12;
73 case LoongArch::fixup_loongarch_abs64_lo20:
74 return ELF::R_LARCH_ABS64_LO20;
75 case LoongArch::fixup_loongarch_abs64_hi12:
76 return ELF::R_LARCH_ABS64_HI12;
77 case LoongArch::fixup_loongarch_tls_le_hi20:
78 return ELF::R_LARCH_TLS_LE_HI20;
79 case LoongArch::fixup_loongarch_tls_le_lo12:
80 return ELF::R_LARCH_TLS_LE_LO12;
81 case LoongArch::fixup_loongarch_tls_le64_lo20:
82 return ELF::R_LARCH_TLS_LE64_LO20;
83 case LoongArch::fixup_loongarch_tls_le64_hi12:
84 return ELF::R_LARCH_TLS_LE64_HI12;
85 // TODO: Handle more fixup-kinds.
86 }
87 }
88
89 std::unique_ptr<MCObjectTargetWriter>
createLoongArchELFObjectWriter(uint8_t OSABI,bool Is64Bit)90 llvm::createLoongArchELFObjectWriter(uint8_t OSABI, bool Is64Bit) {
91 return std::make_unique<LoongArchELFObjectWriter>(OSABI, Is64Bit);
92 }
93