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
14 using namespace mcld;
15
16 struct NameMap {
17 const char* from; ///< the prefix of the input string. (match FROM*)
18 const char* to; ///< the output string.
19 };
20
21 static 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
MCLDEmulateELF(LinkerConfig & pConfig)64 bool 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