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 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 {".text*", ".text", InputSectDesc::NoKeep}, 26 {".rodata*", ".rodata", InputSectDesc::NoKeep}, 27 {".data.rel.ro.local*", ".data.rel.ro.local", InputSectDesc::NoKeep}, 28 {".data.rel.ro*", ".data.rel.ro", InputSectDesc::NoKeep}, 29 {".data*", ".data", InputSectDesc::NoKeep}, 30 {".bss*", ".bss", InputSectDesc::NoKeep}, 31 {".tdata*", ".tdata", InputSectDesc::NoKeep}, 32 {".tbss*", ".tbss", InputSectDesc::NoKeep}, 33 {".init", ".init", InputSectDesc::Keep}, 34 {".fini", ".fini", InputSectDesc::Keep}, 35 {".preinit_array*", ".preinit_array", InputSectDesc::Keep}, 36 {".init_array*", ".init_array", InputSectDesc::Keep}, 37 {".fini_array*", ".fini_array", InputSectDesc::Keep}, 38 // TODO: Support DT_INIT_ARRAY for all constructors? 39 {".ctors*", ".ctors", InputSectDesc::Keep}, 40 {".dtors*", ".dtors", InputSectDesc::Keep}, 41 {".jcr", ".jcr", InputSectDesc::Keep}, 42 // FIXME: in GNU ld, if we are creating a shared object .sdata2 and .sbss2 43 // sections would be handled differently. 44 {".sdata2*", ".sdata", InputSectDesc::NoKeep}, 45 {".sbss2*", ".sbss", InputSectDesc::NoKeep}, 46 {".sdata*", ".sdata", InputSectDesc::NoKeep}, 47 {".sbss*", ".sbss", InputSectDesc::NoKeep}, 48 {".lrodata*", ".lrodata", InputSectDesc::NoKeep}, 49 {".ldata*", ".ldata", InputSectDesc::NoKeep}, 50 {".lbss*", ".lbss", InputSectDesc::NoKeep}, 51 {".gcc_except_table*", ".gcc_except_table", InputSectDesc::Keep}, 52 {".gnu.linkonce.d.rel.ro.local*", ".data.rel.ro.local", InputSectDesc::NoKeep}, // NOLINT 53 {".gnu.linkonce.d.rel.ro*", ".data.rel.ro", InputSectDesc::NoKeep}, 54 {".gnu.linkonce.r*", ".rodata", InputSectDesc::NoKeep}, 55 {".gnu.linkonce.d*", ".data", InputSectDesc::NoKeep}, 56 {".gnu.linkonce.b*", ".bss", InputSectDesc::NoKeep}, 57 {".gnu.linkonce.sb2*", ".sbss", InputSectDesc::NoKeep}, 58 {".gnu.linkonce.sb*", ".sbss", InputSectDesc::NoKeep}, 59 {".gnu.linkonce.s2*", ".sdata", InputSectDesc::NoKeep}, 60 {".gnu.linkonce.s*", ".sdata", InputSectDesc::NoKeep}, 61 {".gnu.linkonce.wi*", ".debug_info", InputSectDesc::NoKeep}, 62 {".gnu.linkonce.td*", ".tdata", InputSectDesc::NoKeep}, 63 {".gnu.linkonce.tb*", ".tbss", InputSectDesc::NoKeep}, 64 {".gnu.linkonce.t*", ".text", InputSectDesc::NoKeep}, 65 {".gnu.linkonce.lr*", ".lrodata", InputSectDesc::NoKeep}, 66 {".gnu.linkonce.lb*", ".lbss", InputSectDesc::NoKeep}, 67 {".gnu.linkonce.l*", ".ldata", InputSectDesc::NoKeep}, 68 }; 69 70 // FIXME: LinkerConfig& pConfig should be constant 71 bool MCLDEmulateELF(LinkerScript& pScript, LinkerConfig& pConfig) { 72 // set up section map 73 if (pConfig.options().getScriptList().empty() && 74 pConfig.codeGenType() != LinkerConfig::Object) { 75 const unsigned int map_size = (sizeof(map) / sizeof(map[0])); 76 for (unsigned int i = 0; i < map_size; ++i) { 77 std::pair<SectionMap::mapping, bool> res = 78 pScript.sectionMap().insert(map[i].from, map[i].to, map[i].policy); 79 if (!res.second) 80 return false; 81 } 82 } else { 83 // FIXME: this is the hack to help assignment processing in current 84 // implementation. 85 pScript.sectionMap().insert("", ""); 86 } 87 88 if (!pConfig.options().nostdlib()) { 89 // TODO: check if user sets the default search path instead via -Y option 90 // set up default search path 91 switch (pConfig.targets().triple().getOS()) { 92 case llvm::Triple::NetBSD: 93 pScript.directories().insert("=/usr/lib"); 94 break; 95 case llvm::Triple::Win32: 96 pScript.directories().insert("=/mingw/lib"); 97 break; 98 default: 99 pScript.directories().insert("=/lib"); 100 pScript.directories().insert("=/usr/lib"); 101 break; 102 } 103 } 104 return true; 105 } 106 107 } // namespace mcld 108
