ld/emultempl/solaris2.em

   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 ${EMULATION_NAME}
  12    Copyright (C) 2010-2017 Free Software Foundation, Inc.
  13    Written by Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
  14
  15    This file is part of the GNU Binutils.
  16
  17    This program is free software; you can redistribute it and/or modify
  18    it under the terms of the GNU General Public License as published by
  19    the Free Software Foundation; either version 3 of the License, or
  20    (at your option) any later version.
  21
  22    This program is distributed in the hope that it will be useful,
  23    but WITHOUT ANY WARRANTY; without even the implied warranty of
  24    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25    GNU General Public License for more details.
  26
  27    You should have received a copy of the GNU General Public License
  28    along with this program; if not, write to the Free Software
  29    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  30    MA 02110-1301, USA.  */
  31
  32 #define TARGET_IS_${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 (!bfd_link_relocatable (&link_info))
  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 (bfd_link_dll (&link_info)
  79       && ((link_info.version_info != NULL
  80            && link_info.version_info->name[0] != '\0')
  81           || link_info.create_default_symver))
  82     {
  83       struct bfd_elf_version_expr *globals = NULL, *locals = NULL;
  84       struct bfd_elf_version_tree *basever;
  85       const char *soname;
  86
  87       for (sym = global_syms; *sym != NULL; sym++)
  88         {
  89           /* Create a version pattern for this symbol.  Some of them start
  90              off as local, others as global, so try both.  */
  91           globals = lang_new_vers_pattern (globals, *sym, NULL, TRUE);
  92           locals = lang_new_vers_pattern (locals, *sym, NULL, TRUE);
  93         }
  94
  95       /* New version node for those symbols.  */
  96       basever = lang_new_vers_node (globals, locals);
  97
  98       /* The version name matches what bfd_elf_size_dynamic_sections uses
  99          for the base version.  */
 100       soname = bfd_elf_get_dt_soname (link_info.output_bfd);
 101       if (soname == NULL)
 102         soname = lbasename (bfd_get_filename (link_info.output_bfd));
 103
 104       /* Register the node.  */
 105       lang_register_vers_node (soname, basever, NULL);
 106       /* Enforce base version.  The encoded vd_ndx is vernum + 1.  */
 107       basever->vernum = 0;
 108     }
 109
 110   gld${EMULATION_NAME}_before_allocation ();
 111 }
 112
 113 /* The Solaris 2 ABI requires two local symbols to be emitted for every
 114    executable and shared object.
 115
 116    Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
 117    File, p.63.  */
 118 static void
 119 elf_solaris2_after_allocation (void)
 120 {
 121   /* Local symbols required by the Solaris 2 ABI.  Already emitted by
 122      emulparams/solaris2.sh.  */
 123   static const char *local_syms[] = {
 124     "_START_",
 125     "_END_",
 126     NULL
 127   };
 128   const char **sym;
 129
 130   /* Do this for both executables and shared objects.  */
 131   if (!bfd_link_relocatable (&link_info))
 132     {
 133       for (sym = local_syms; *sym != NULL; sym++)
 134         {
 135           struct elf_link_hash_entry *h;
 136
 137           /* Lookup symbol.  */
 138           h = elf_link_hash_lookup (elf_hash_table (&link_info), *sym,
 139                                     FALSE, FALSE, FALSE);
 140           if (h == NULL)
 141             continue;
 142
 143           /* Turn it local.  */
 144           h->forced_local = 1;
 145           /* Type should be STT_OBJECT, not STT_NOTYPE.  */
 146           h->type = STT_OBJECT;
 147         }
 148     }
 149
 150   gld${EMULATION_NAME}_after_allocation ();
 151 }
 152
 153 EOF
 154
 155 LDEMUL_BEFORE_ALLOCATION=elf_solaris2_before_allocation
 156 LDEMUL_AFTER_ALLOCATION=elf_solaris2_after_allocation