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 }
64