lib/Target/Hexagon/MCTargetDesc/HexagonELFObjectWriter.cpp

   1 //===-- HexagonELFObjectWriter.cpp - Hexagon Target Descriptions ----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "Hexagon.h"
  11 #include "llvm/MC/MCAssembler.h"
  12 #include "llvm/MC/MCELFObjectWriter.h"
  13 #include "llvm/Support/Debug.h"
  14 #include "llvm/Support/raw_ostream.h"
  15
  16 #define DEBUG_TYPE "hexagon-elf-writer"
  17
  18 using namespace llvm;
  19 using namespace Hexagon;
  20
  21 namespace {
  22
  23 class HexagonELFObjectWriter : public MCELFObjectTargetWriter {
  24 private:
  25   StringRef CPU;
  26
  27 public:
  28   HexagonELFObjectWriter(uint8_t OSABI, StringRef C);
  29
  30   unsigned GetRelocType(MCValue const &Target, MCFixup const &Fixup,
  31                         bool IsPCRel) const override;
  32 };
  33 }
  34
  35 HexagonELFObjectWriter::HexagonELFObjectWriter(uint8_t OSABI, StringRef C)
  36     : MCELFObjectTargetWriter(/*Is64bit*/ false, OSABI, ELF::EM_HEXAGON,
  37                               /*HasRelocationAddend*/ true),
  38       CPU(C) {}
  39
  40 unsigned HexagonELFObjectWriter::GetRelocType(MCValue const &/*Target*/,
  41                                               MCFixup const &Fixup,
  42                                               bool IsPCRel) const {
  43   unsigned Type = (unsigned)ELF::R_HEX_NONE;
  44   llvm::MCFixupKind Kind = Fixup.getKind();
  45
  46   switch (Kind) {
  47   default:
  48     DEBUG(dbgs() << "unrecognized relocation " << Fixup.getKind() << "\n");
  49     llvm_unreachable("Unimplemented Fixup kind!");
  50     break;
  51   case FK_Data_4:
  52     Type = (IsPCRel) ? ELF::R_HEX_32_PCREL : ELF::R_HEX_32;
  53     break;
  54   }
  55   return Type;
  56 }
  57
  58 MCObjectWriter *llvm::createHexagonELFObjectWriter(raw_ostream &OS,
  59                                                    uint8_t OSABI,
  60                                                    StringRef CPU) {
  61   MCELFObjectTargetWriter *MOTW = new HexagonELFObjectWriter(OSABI, CPU);
  62   return createELFObjectWriter(MOTW, OS, /*IsLittleEndian*/ true);
  63 }