llvm/lib/Target/MSP430/MCTargetDesc/MSP430ELFObjectWriter.cpp

   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 }