ELFBinaryReader.cpp revision d0fbbb227051be16931a1aa9b4a7722ac039c698 
1//===- ELFBinaryReader.cpp ------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#include <mcld/LD/ELFBinaryReader.h>
10
11#include <mcld/IRBuilder.h>
12#include <mcld/LinkerConfig.h>
13#include <mcld/MC/MCLDInput.h>
14#include <mcld/Support/MemoryArea.h>
15#include <mcld/Target/GNULDBackend.h>
16
17#include <llvm/Support/ELF.h>
18
19using namespace mcld;
20
21//===----------------------------------------------------------------------===//
22// ELFBinaryReader
23//===----------------------------------------------------------------------===//
24/// constructor
25ELFBinaryReader::ELFBinaryReader(GNULDBackend& pBackend,
26                                 IRBuilder& pBuilder,
27                                 const LinkerConfig& pConfig)
28  : BinaryReader(),
29    m_Backend(pBackend),
30    m_Builder(pBuilder),
31    m_Config(pConfig) {
32}
33
34/// destructor
35ELFBinaryReader::~ELFBinaryReader()
36{
37}
38
39bool ELFBinaryReader::readBinary(Input& pInput)
40{
41  // section: NULL
42  m_Builder.CreateELFHeader(pInput,
43                            "",
44                            LDFileFormat::Null,
45                            llvm::ELF::SHT_NULL,
46                            0x0);
47
48  // section: .data
49  LDSection* data_sect =
50    m_Builder.CreateELFHeader(pInput,
51                              ".data",
52                              LDFileFormat::Regular,
53                              llvm::ELF::SHF_WRITE | llvm::ELF::SHF_ALLOC,
54                              0x1);
55
56
57  SectionData* data = m_Builder.CreateSectionData(*data_sect);
58  size_t data_size = pInput.memArea()->handler()->size();
59  Fragment* frag = m_Builder.CreateRegion(pInput, 0x0, data_size);
60  m_Builder.AppendFragment(*frag, *data);
61
62  // section: .shstrtab
63  m_Builder.CreateELFHeader(pInput,
64                            ".shstrtab",
65                            LDFileFormat::NamePool,
66                            llvm::ELF::SHT_STRTAB,
67                            0x1);
68
69  // section: .symtab
70  m_Builder.CreateELFHeader(pInput,
71                            ".symtab",
72                            LDFileFormat::NamePool,
73                            llvm::ELF::SHT_SYMTAB,
74                            m_Config.targets().bitclass() / 8);
75
76  // symbol: .data
77  m_Builder.AddSymbol(pInput,
78                      ".data",
79                      ResolveInfo::Section,
80                      ResolveInfo::Define,
81                      ResolveInfo::Local,
82                      0x0,
83                      0x0,
84                      data_sect);
85
86  // symbol: _start
87  m_Builder.AddSymbol(pInput,
88                      "_binary_" + pInput.path().filename().string() + "_start",
89                      ResolveInfo::NoType,
90                      ResolveInfo::Define,
91                      ResolveInfo::Global,
92                      0x0,
93                      0x0,
94                      data_sect);
95
96  // symbol: _end
97  m_Builder.AddSymbol(pInput,
98                      "_binary_" + pInput.path().filename().string() + "_end",
99                      ResolveInfo::NoType,
100                      ResolveInfo::Define,
101                      ResolveInfo::Global,
102                      0x0,
103                      data_size,
104                      data_sect);
105
106  // symbol: _size
107  m_Builder.AddSymbol(pInput,
108                      "_binary_" + pInput.path().filename().string() + "_size",
109                      ResolveInfo::NoType,
110                      ResolveInfo::Define,
111                      ResolveInfo::Global,
112                      0x0,
113                      data_size,
114                      data_sect);
115
116  // section: .strtab
117  m_Builder.CreateELFHeader(pInput,
118                            ".strtab",
119                            LDFileFormat::NamePool,
120                            llvm::ELF::SHT_STRTAB,
121                            0x1);
122
123  return true;
124}
125