1//===-- MBlazeELFWriterInfo.cpp - ELF Writer Info for the MBlaze backend --===//
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// This file implements ELF writer information for the MBlaze backend.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MBlazeELFWriterInfo.h"
15#include "MBlazeRelocations.h"
16#include "llvm/Function.h"
17#include "llvm/Support/ELF.h"
18#include "llvm/Support/ErrorHandling.h"
19#include "llvm/Target/TargetData.h"
20#include "llvm/Target/TargetMachine.h"
21
22using namespace llvm;
23
24//===----------------------------------------------------------------------===//
25//  Implementation of the MBlazeELFWriterInfo class
26//===----------------------------------------------------------------------===//
27
28MBlazeELFWriterInfo::MBlazeELFWriterInfo(TargetMachine &TM)
29  : TargetELFWriterInfo(TM.getTargetData()->getPointerSizeInBits() == 64,
30                        TM.getTargetData()->isLittleEndian()) {
31}
32
33MBlazeELFWriterInfo::~MBlazeELFWriterInfo() {}
34
35unsigned MBlazeELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
36  switch (MachineRelTy) {
37  case MBlaze::reloc_pcrel_word:
38    return ELF::R_MICROBLAZE_64_PCREL;
39  case MBlaze::reloc_absolute_word:
40    return ELF::R_MICROBLAZE_NONE;
41  default:
42    llvm_unreachable("unknown mblaze machine relocation type");
43  }
44  return 0;
45}
46
47long int MBlazeELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
48                                                    long int Modifier) const {
49  switch (RelTy) {
50  case ELF::R_MICROBLAZE_32_PCREL:
51    return Modifier - 4;
52  case ELF::R_MICROBLAZE_32:
53    return Modifier;
54  default:
55    llvm_unreachable("unknown mblaze relocation type");
56  }
57  return 0;
58}
59
60unsigned MBlazeELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
61  // FIXME: Most of these sizes are guesses based on the name
62  switch (RelTy) {
63  case ELF::R_MICROBLAZE_32:
64  case ELF::R_MICROBLAZE_32_PCREL:
65  case ELF::R_MICROBLAZE_32_PCREL_LO:
66  case ELF::R_MICROBLAZE_32_LO:
67  case ELF::R_MICROBLAZE_SRO32:
68  case ELF::R_MICROBLAZE_SRW32:
69  case ELF::R_MICROBLAZE_32_SYM_OP_SYM:
70  case ELF::R_MICROBLAZE_GOTOFF_32:
71    return 32;
72
73  case ELF::R_MICROBLAZE_64_PCREL:
74  case ELF::R_MICROBLAZE_64:
75  case ELF::R_MICROBLAZE_GOTPC_64:
76  case ELF::R_MICROBLAZE_GOT_64:
77  case ELF::R_MICROBLAZE_PLT_64:
78  case ELF::R_MICROBLAZE_GOTOFF_64:
79    return 64;
80  }
81
82  return 0;
83}
84
85bool MBlazeELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
86  // FIXME: Most of these are guesses based on the name
87  switch (RelTy) {
88  case ELF::R_MICROBLAZE_32_PCREL:
89  case ELF::R_MICROBLAZE_64_PCREL:
90  case ELF::R_MICROBLAZE_32_PCREL_LO:
91  case ELF::R_MICROBLAZE_GOTPC_64:
92    return true;
93  }
94
95  return false;
96}
97
98unsigned MBlazeELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
99  return MBlaze::reloc_absolute_word;
100}
101
102long int MBlazeELFWriterInfo::computeRelocation(unsigned SymOffset,
103                                                unsigned RelOffset,
104                                                unsigned RelTy) const {
105  if (RelTy == ELF::R_MICROBLAZE_32_PCREL || ELF::R_MICROBLAZE_64_PCREL)
106    return SymOffset - (RelOffset + 4);
107  else
108    assert("computeRelocation unknown for this relocation type");
109
110  return 0;
111}
112