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 
15 #define DEBUG_TYPE "hexagon-elf-writer"
16 
17 using namespace llvm;
18 using namespace Hexagon;
19 
20 namespace {
21 
22 class HexagonELFObjectWriter : public MCELFObjectTargetWriter {
23 private:
24   StringRef CPU;
25 
26 public:
27   HexagonELFObjectWriter(uint8_t OSABI, StringRef C);
28 
29   virtual unsigned GetRelocType(MCValue const &Target, MCFixup const &Fixup,
30                                 bool IsPCRel) const override;
31 };
32 }
33 
34 HexagonELFObjectWriter::HexagonELFObjectWriter(uint8_t OSABI, StringRef C)
35     : MCELFObjectTargetWriter(/*Is64bit*/ false, OSABI, ELF::EM_HEXAGON,
36                               /*HasRelocationAddend*/ true),
37       CPU(C) {}
38 
39 unsigned HexagonELFObjectWriter::GetRelocType(MCValue const &/*Target*/,
40                                               MCFixup const &Fixup,
41                                               bool IsPCRel) const {
42   unsigned Type = (unsigned)ELF::R_HEX_NONE;
43   llvm::MCFixupKind Kind = Fixup.getKind();
44 
45   switch (Kind) {
46   default:
47     DEBUG(dbgs() << "unrecognized relocation " << Fixup.getKind() << "\n");
48     llvm_unreachable("Unimplemented Fixup kind!");
49     break;
50   case FK_Data_4:
51     Type = (IsPCRel) ? ELF::R_HEX_32_PCREL : ELF::R_HEX_32;
52     break;
53   }
54   return Type;
55 }
56 
57 MCObjectWriter *llvm::createHexagonELFObjectWriter(raw_ostream &OS,
58                                                    uint8_t OSABI,
59                                                    StringRef CPU) {
60   MCELFObjectTargetWriter *MOTW = new HexagonELFObjectWriter(OSABI, CPU);
61   return createELFObjectWriter(MOTW, OS, /*IsLittleEndian*/ true);
62 }