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