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      1 # This shell script emits a C file. -*- C -*-
      2 # It does some substitutions.
      3 if [ -z "$MACHINE" ]; then
      4   OUTPUT_ARCH=${ARCH}
      5 else
      6   OUTPUT_ARCH=${ARCH}:${MACHINE}
      7 fi
      8 fragment <<EOF
      9 /* This file is generated by a shell script.  DO NOT EDIT! */
     10 
     11 /* Solaris 2 emulation code for ${EMULATION_NAME}
     12    Copyright (C) 2010-2014 Free Software Foundation, Inc.
     13    Written by Rainer Orth <ro (a] CeBiTec.Uni-Bielefeld.DE>
     14 
     15    This file is part of the GNU Binutils.
     16 
     17    This program is free software; you can redistribute it and/or modify
     18    it under the terms of the GNU General Public License as published by
     19    the Free Software Foundation; either version 3 of the License, or
     20    (at your option) any later version.
     21 
     22    This program is distributed in the hope that it will be useful,
     23    but WITHOUT ANY WARRANTY; without even the implied warranty of
     24    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     25    GNU General Public License for more details.
     26 
     27    You should have received a copy of the GNU General Public License
     28    along with this program; if not, write to the Free Software
     29    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
     30    MA 02110-1301, USA.  */
     31 
     32 #define TARGET_IS_${EMULATION_NAME}
     33 
     34 /* The Solaris 2 ABI requires some global symbols to be present in the
     35    .dynsym table of executables and shared objects.  If generating a
     36    versioned shared object, they must always be bound to the base version.
     37 
     38    Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
     39    File, p.63.  */
     40 static void
     41 elf_solaris2_before_allocation (void)
     42 {
     43   /* Global symbols required by the Solaris 2 ABI.  */
     44   static const char *global_syms[] = {
     45     "_DYNAMIC",
     46     "_GLOBAL_OFFSET_TABLE_",
     47     "_PROCEDURE_LINKAGE_TABLE_",
     48     "_edata",
     49     "_end",
     50     "_etext",
     51     NULL
     52   };
     53   const char **sym;
     54 
     55   /* Do this for both executables and shared objects.  */
     56   if (!link_info.relocatable)
     57     {
     58       for (sym = global_syms; *sym != NULL; sym++)
     59 	{
     60 	  struct elf_link_hash_entry *h;
     61 
     62 	  /* Lookup symbol.  */
     63 	  h = elf_link_hash_lookup (elf_hash_table (&link_info), *sym,
     64 				    FALSE, FALSE, FALSE);
     65 	  if (h == NULL)
     66 	    continue;
     67 
     68 	  /* Undo the hiding done by _bfd_elf_define_linkage_sym.  */
     69 	  h->forced_local = 0;
     70 	  h->other &= ~STV_HIDDEN;
     71 
     72 	  /* Emit it into the .dynamic section, too.  */
     73 	  bfd_elf_link_record_dynamic_symbol (&link_info, h);
     74 	}
     75     }
     76 
     77   /* Only do this if emitting a shared object and versioning is in place. */
     78   if (link_info.shared
     79       && (link_info.version_info != NULL
     80 	  || link_info.create_default_symver))
     81     {
     82       struct bfd_elf_version_expr *globals = NULL, *locals = NULL;
     83       struct bfd_elf_version_tree *basever;
     84       const char *soname;
     85 
     86       for (sym = global_syms; *sym != NULL; sym++)
     87 	{
     88 	  /* Create a version pattern for this symbol.  Some of them start
     89 	     off as local, others as global, so try both.  */
     90 	  globals = lang_new_vers_pattern (globals, *sym, NULL, TRUE);
     91 	  locals = lang_new_vers_pattern (locals, *sym, NULL, TRUE);
     92 	}
     93 
     94       /* New version node for those symbols.  */
     95       basever = lang_new_vers_node (globals, locals);
     96 
     97       /* The version name matches what bfd_elf_size_dynamic_sections uses
     98 	 for the base version.  */
     99       soname = bfd_elf_get_dt_soname (link_info.output_bfd);
    100       if (soname == NULL)
    101 	soname = lbasename (bfd_get_filename (link_info.output_bfd));
    102 
    103       /* Register the node.  */
    104       lang_register_vers_node (soname, basever, NULL);
    105       /* Enforce base version.  The encoded vd_ndx is vernum + 1.  */
    106       basever->vernum = 0;
    107     }
    108 
    109   gld${EMULATION_NAME}_before_allocation ();
    110 }
    111 
    112 /* The Solaris 2 ABI requires two local symbols to be emitted for every
    113    executable and shared object.
    114 
    115    Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
    116    File, p.63.  */
    117 static void
    118 elf_solaris2_after_allocation (void)
    119 {
    120   /* Local symbols required by the Solaris 2 ABI.  Already emitted by
    121      emulparams/solaris2.sh.  */
    122   static const char *local_syms[] = {
    123     "_START_",
    124     "_END_",
    125     NULL
    126   };
    127   const char **sym;
    128 
    129   /* Do this for both executables and shared objects.  */
    130   if (!link_info.relocatable)
    131     {
    132       for (sym = local_syms; *sym != NULL; sym++)
    133 	{
    134 	  struct elf_link_hash_entry *h;
    135 
    136 	  /* Lookup symbol.  */
    137 	  h = elf_link_hash_lookup (elf_hash_table (&link_info), *sym,
    138 				    FALSE, FALSE, FALSE);
    139 	  if (h == NULL)
    140 	    continue;
    141 
    142 	  /* Turn it local.  */
    143 	  h->forced_local = 1;
    144 	  /* Type should be STT_OBJECT, not STT_NOTYPE.  */
    145 	  h->type = STT_OBJECT;
    146 	}
    147     }
    148 
    149   gld${EMULATION_NAME}_after_allocation ();
    150 }
    151 
    152 EOF
    153 
    154 LDEMUL_BEFORE_ALLOCATION=elf_solaris2_before_allocation
    155 LDEMUL_AFTER_ALLOCATION=elf_solaris2_after_allocation
    156