ELFEmulation.cpp revision 6f75755c9204b1d8817ae5a65a2f7e5af0ec3f70 
1//===- ELFEmulation.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/Target/ELFEmulation.h>
10#include <mcld/LinkerConfig.h>
11
12#include <llvm/Support/Host.h>
13
14using namespace mcld;
15
16struct NameMap {
17  const char* from; ///< the prefix of the input string. (match FROM*)
18  const char* to;   ///< the output string.
19};
20
21static const NameMap map[] =
22{
23  {".text", ".text"},
24  {".rodata", ".rodata"},
25  {".data.rel.ro.local", ".data.rel.ro.local"},
26  {".data.rel.ro", ".data.rel.ro"},
27  {".data", ".data"},
28  {".bss", ".bss"},
29  {".tdata", ".tdata"},
30  {".tbss", ".tbss"},
31  {".init_array", ".init_array"},
32  {".fini_array", ".fini_array"},
33  // TODO: Support DT_INIT_ARRAY for all constructors?
34  {".ctors", ".ctors"},
35  {".dtors", ".dtors"},
36  // FIXME: in GNU ld, if we are creating a shared object .sdata2 and .sbss2
37  // sections would be handled differently.
38  {".sdata2", ".sdata"},
39  {".sbss2", ".sbss"},
40  {".sdata", ".sdata"},
41  {".sbss", ".sbss"},
42  {".lrodata", ".lrodata"},
43  {".ldata", ".ldata"},
44  {".lbss", ".lbss"},
45  {".gcc_except_table", ".gcc_except_table"},
46  {".gnu.linkonce.d.rel.ro.local", ".data.rel.ro.local"},
47  {".gnu.linkonce.d.rel.ro", ".data.rel.ro"},
48  {".gnu.linkonce.r", ".rodata"},
49  {".gnu.linkonce.d", ".data"},
50  {".gnu.linkonce.b", ".bss"},
51  {".gnu.linkonce.sb2", ".sbss"},
52  {".gnu.linkonce.sb", ".sbss"},
53  {".gnu.linkonce.s2", ".sdata"},
54  {".gnu.linkonce.s", ".sdata"},
55  {".gnu.linkonce.wi", ".debug_info"},
56  {".gnu.linkonce.td", ".tdata"},
57  {".gnu.linkonce.tb", ".tbss"},
58  {".gnu.linkonce.t", ".text"},
59  {".gnu.linkonce.lr", ".lrodata"},
60  {".gnu.linkonce.lb", ".lbss"},
61  {".gnu.linkonce.l", ".ldata"},
62};
63
64bool mcld::MCLDEmulateELF(LinkerConfig& pConfig)
65{
66  // set up section map
67  if (pConfig.codeGenType() != LinkerConfig::Object) {
68    const unsigned int map_size =  (sizeof(map) / sizeof(map[0]) );
69    for (unsigned int i = 0; i < map_size; ++i) {
70      bool exist = false;
71      pConfig.scripts().sectionMap().append(map[i].from, map[i].to, exist);
72      if (exist)
73        return false;
74    }
75  }
76
77  if (!pConfig.options().nostdlib()) {
78    // TODO: check if user sets the default search path instead via -Y option
79    // set up default search path
80    if (llvm::Triple::NetBSD == pConfig.targets().triple().getOS()) {
81      pConfig.options().directories().insert("=/usr/lib");
82    }
83    else {
84      pConfig.options().directories().insert("=/lib");
85      pConfig.options().directories().insert("=/usr/lib");
86    }
87  }
88  return true;
89}
90
91