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/LinkerScript.h>
11#include <mcld/LinkerConfig.h>
12
13#include <llvm/Support/Host.h>
14
15using namespace mcld;
16
17struct NameMap {
18  const char* from; ///< the prefix of the input string. (match FROM*)
19  const char* to;   ///< the output string.
20};
21
22static const NameMap map[] =
23{
24  {".text", ".text"},
25  {".rodata", ".rodata"},
26  {".data.rel.ro.local", ".data.rel.ro.local"},
27  {".data.rel.ro", ".data.rel.ro"},
28  {".data", ".data"},
29  {".bss", ".bss"},
30  {".tdata", ".tdata"},
31  {".tbss", ".tbss"},
32  {".init_array", ".init_array"},
33  {".fini_array", ".fini_array"},
34  // TODO: Support DT_INIT_ARRAY for all constructors?
35  {".ctors", ".ctors"},
36  {".dtors", ".dtors"},
37  // FIXME: in GNU ld, if we are creating a shared object .sdata2 and .sbss2
38  // sections would be handled differently.
39  {".sdata2", ".sdata"},
40  {".sbss2", ".sbss"},
41  {".sdata", ".sdata"},
42  {".sbss", ".sbss"},
43  {".lrodata", ".lrodata"},
44  {".ldata", ".ldata"},
45  {".lbss", ".lbss"},
46  {".gcc_except_table", ".gcc_except_table"},
47  {".gnu.linkonce.d.rel.ro.local", ".data.rel.ro.local"},
48  {".gnu.linkonce.d.rel.ro", ".data.rel.ro"},
49  {".gnu.linkonce.r", ".rodata"},
50  {".gnu.linkonce.d", ".data"},
51  {".gnu.linkonce.b", ".bss"},
52  {".gnu.linkonce.sb2", ".sbss"},
53  {".gnu.linkonce.sb", ".sbss"},
54  {".gnu.linkonce.s2", ".sdata"},
55  {".gnu.linkonce.s", ".sdata"},
56  {".gnu.linkonce.wi", ".debug_info"},
57  {".gnu.linkonce.td", ".tdata"},
58  {".gnu.linkonce.tb", ".tbss"},
59  {".gnu.linkonce.t", ".text"},
60  {".gnu.linkonce.lr", ".lrodata"},
61  {".gnu.linkonce.lb", ".lbss"},
62  {".gnu.linkonce.l", ".ldata"},
63};
64
65bool mcld::MCLDEmulateELF(LinkerScript& pScript, LinkerConfig& pConfig)
66// FIXME: LinkerConfig& pConfig should be constant
67{
68  // set up section map
69  if (pConfig.codeGenType() != LinkerConfig::Object) {
70    const unsigned int map_size =  (sizeof(map) / sizeof(map[0]) );
71    for (unsigned int i = 0; i < map_size; ++i) {
72      bool exist = false;
73      pScript.sectionMap().append(map[i].from, map[i].to, exist);
74      if (exist)
75        return false;
76    }
77  }
78
79  if (!pConfig.options().nostdlib()) {
80    // TODO: check if user sets the default search path instead via -Y option
81    // set up default search path
82    switch (pConfig.targets().triple().getOS()) {
83      case llvm::Triple::NetBSD:
84        pScript.directories().insert("=/usr/lib");
85        break;
86      case llvm::Triple::MinGW32:
87        pScript.directories().insert("=/mingw/lib");
88        break;
89      default:
90        pScript.directories().insert("=/lib");
91        pScript.directories().insert("=/usr/lib");
92        break;
93    }
94  }
95  return true;
96}
97
98