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 #include <mcld/Script/InputSectDesc.h>
13
14 #include <llvm/Support/Host.h>
15
16 using namespace mcld;
17
18 struct NameMap {
19 const char* from; ///< the prefix of the input string. (match FROM*)
20 const char* to; ///< the output string.
21 InputSectDesc::KeepPolicy policy; /// mark whether the input is kept in GC
22 };
23
24 static const NameMap map[] =
25 {
26 {".text*", ".text", InputSectDesc::NoKeep},
27 {".rodata*", ".rodata", InputSectDesc::NoKeep},
28 {".data.rel.ro.local*", ".data.rel.ro.local", InputSectDesc::NoKeep},
29 {".data.rel.ro*", ".data.rel.ro", InputSectDesc::NoKeep},
30 {".data*", ".data", InputSectDesc::NoKeep},
31 {".bss*", ".bss", InputSectDesc::NoKeep},
32 {".tdata*", ".tdata", InputSectDesc::NoKeep},
33 {".tbss*", ".tbss", InputSectDesc::NoKeep},
34 {".init", ".init", InputSectDesc::Keep},
35 {".fini", ".fini", InputSectDesc::Keep},
36 {".preinit_array*", ".preinit_array", InputSectDesc::Keep},
37 {".init_array*", ".init_array", InputSectDesc::Keep},
38 {".fini_array*", ".fini_array", InputSectDesc::Keep},
39 // TODO: Support DT_INIT_ARRAY for all constructors?
40 {".ctors*", ".ctors", InputSectDesc::Keep},
41 {".dtors*", ".dtors", InputSectDesc::Keep},
42 {".jcr", ".jcr", InputSectDesc::Keep},
43 // FIXME: in GNU ld, if we are creating a shared object .sdata2 and .sbss2
44 // sections would be handled differently.
45 {".sdata2*", ".sdata", InputSectDesc::NoKeep},
46 {".sbss2*", ".sbss", InputSectDesc::NoKeep},
47 {".sdata*", ".sdata", InputSectDesc::NoKeep},
48 {".sbss*", ".sbss", InputSectDesc::NoKeep},
49 {".lrodata*", ".lrodata", InputSectDesc::NoKeep},
50 {".ldata*", ".ldata", InputSectDesc::NoKeep},
51 {".lbss*", ".lbss", InputSectDesc::NoKeep},
52 {".gcc_except_table*", ".gcc_except_table", InputSectDesc::Keep},
53 {".gnu.linkonce.d.rel.ro.local*", ".data.rel.ro.local", InputSectDesc::NoKeep},
54 {".gnu.linkonce.d.rel.ro*", ".data.rel.ro", InputSectDesc::NoKeep},
55 {".gnu.linkonce.r*", ".rodata", InputSectDesc::NoKeep},
56 {".gnu.linkonce.d*", ".data", InputSectDesc::NoKeep},
57 {".gnu.linkonce.b*", ".bss", InputSectDesc::NoKeep},
58 {".gnu.linkonce.sb2*", ".sbss", InputSectDesc::NoKeep},
59 {".gnu.linkonce.sb*", ".sbss", InputSectDesc::NoKeep},
60 {".gnu.linkonce.s2*", ".sdata", InputSectDesc::NoKeep},
61 {".gnu.linkonce.s*", ".sdata", InputSectDesc::NoKeep},
62 {".gnu.linkonce.wi*", ".debug_info", InputSectDesc::NoKeep},
63 {".gnu.linkonce.td*", ".tdata", InputSectDesc::NoKeep},
64 {".gnu.linkonce.tb*", ".tbss", InputSectDesc::NoKeep},
65 {".gnu.linkonce.t*", ".text", InputSectDesc::NoKeep},
66 {".gnu.linkonce.lr*", ".lrodata", InputSectDesc::NoKeep},
67 {".gnu.linkonce.lb*", ".lbss", InputSectDesc::NoKeep},
68 {".gnu.linkonce.l*", ".ldata", InputSectDesc::NoKeep},
69 };
70
MCLDEmulateELF(LinkerScript & pScript,LinkerConfig & pConfig)71 bool mcld::MCLDEmulateELF(LinkerScript& pScript, LinkerConfig& pConfig)
72 // FIXME: LinkerConfig& pConfig should be constant
73 {
74 // set up section map
75 if (pConfig.options().getScriptList().empty() &&
76 pConfig.codeGenType() != LinkerConfig::Object) {
77 const unsigned int map_size = (sizeof(map) / sizeof(map[0]) );
78 for (unsigned int i = 0; i < map_size; ++i) {
79 std::pair<SectionMap::mapping, bool> res =
80 pScript.sectionMap().insert(map[i].from, map[i].to, map[i].policy);
81 if (!res.second)
82 return false;
83 }
84 } else {
85 // FIXME: this is the hack to help assignment processing in current
86 // implementation.
87 pScript.sectionMap().insert("", "");
88 }
89
90 if (!pConfig.options().nostdlib()) {
91 // TODO: check if user sets the default search path instead via -Y option
92 // set up default search path
93 switch (pConfig.targets().triple().getOS()) {
94 case llvm::Triple::NetBSD:
95 pScript.directories().insert("=/usr/lib");
96 break;
97 case llvm::Triple::MinGW32:
98 pScript.directories().insert("=/mingw/lib");
99 break;
100 default:
101 pScript.directories().insert("=/lib");
102 pScript.directories().insert("=/usr/lib");
103 break;
104 }
105 }
106 return true;
107 }
108
109