1 //===-- MSP430ELFObjectWriter.cpp - MSP430 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/MSP430FixupKinds.h"
10 #include "MCTargetDesc/MSP430MCTargetDesc.h"
11 
12 #include "llvm/MC/MCELFObjectWriter.h"
13 #include "llvm/MC/MCFixup.h"
14 #include "llvm/MC/MCObjectWriter.h"
15 #include "llvm/MC/MCValue.h"
16 #include "llvm/Support/ErrorHandling.h"
17 
18 using namespace llvm;
19 
20 namespace {
21 class MSP430ELFObjectWriter : public MCELFObjectTargetWriter {
22 public:
23   MSP430ELFObjectWriter(uint8_t OSABI)
24     : MCELFObjectTargetWriter(false, OSABI, ELF::EM_MSP430,
25                               /*HasRelocationAddend*/ true) {}
26 
27   ~MSP430ELFObjectWriter() override = default;
28 
29 protected:
30   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
31                         const MCFixup &Fixup, bool IsPCRel) const override {
32     // Translate fixup kind to ELF relocation type.
33     switch (Fixup.getTargetKind()) {
34     case FK_Data_1:                   return ELF::R_MSP430_8;
35     case FK_Data_2:                   return ELF::R_MSP430_16_BYTE;
36     case FK_Data_4:                   return ELF::R_MSP430_32;
37     case MSP430::fixup_32:            return ELF::R_MSP430_32;
38     case MSP430::fixup_10_pcrel:      return ELF::R_MSP430_10_PCREL;
39     case MSP430::fixup_16:            return ELF::R_MSP430_16;
40     case MSP430::fixup_16_pcrel:      return ELF::R_MSP430_16_PCREL;
41     case MSP430::fixup_16_byte:       return ELF::R_MSP430_16_BYTE;
42     case MSP430::fixup_16_pcrel_byte: return ELF::R_MSP430_16_PCREL_BYTE;
43     case MSP430::fixup_2x_pcrel:      return ELF::R_MSP430_2X_PCREL;
44     case MSP430::fixup_rl_pcrel:      return ELF::R_MSP430_RL_PCREL;
45     case MSP430::fixup_8:             return ELF::R_MSP430_8;
46     case MSP430::fixup_sym_diff:      return ELF::R_MSP430_SYM_DIFF;
47     default:
48       llvm_unreachable("Invalid fixup kind");
49     }
50   }
51 };
52 } // end of anonymous namespace
53 
54 std::unique_ptr<MCObjectTargetWriter>
55 llvm::createMSP430ELFObjectWriter(uint8_t OSABI) {
56   return std::make_unique<MSP430ELFObjectWriter>(OSABI);
57 }
58