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 ${EMULATION_NAME}
  12    Copyright (C) 2010-2024 Free Software Foundation, Inc.
  13    Written by Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
  14
  15    This file is part of the GNU Binutils.
  16
  17    This program is free software; you can redistribute it and/or modify
  18    it under the terms of the GNU General Public License as published by
  19    the Free Software Foundation; either version 3 of the License, or
  20    (at your option) any later version.
  21
  22    This program is distributed in the hope that it will be useful,
  23    but WITHOUT ANY WARRANTY; without even the implied warranty of
  24    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25    GNU General Public License for more details.
  26
  27    You should have received a copy of the GNU General Public License
  28    along with this program; if not, write to the Free Software
  29    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  30    MA 02110-1301, USA.  */
  31
  32 #define TARGET_IS_${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    The Solaris 2 ABI also requires two local symbols to be emitted for
  39    every executable and shared object.
  40
  41    Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
  42    File, p.63.  */
  43
  44 static void
  45 elf_solaris2_before_allocation (void)
  46 {
  47   /* Global symbols required by the Solaris 2 ABI.  */
  48   static const char *global_syms[] = {
  49     "_DYNAMIC",
  50     "_GLOBAL_OFFSET_TABLE_",
  51     "_PROCEDURE_LINKAGE_TABLE_",
  52     "_edata",
  53     "_end",
  54     "_etext",
  55     NULL
  56   };
  57   /* Local symbols required by the Solaris 2 ABI.  Already emitted by
  58      emulparams/solaris2.sh.  */
  59   static const char *local_syms[] = {
  60     "_START_",
  61     "_END_",
  62     NULL
  63   };
  64   const char **sym;
  65
  66   /* Do this for both executables and shared objects.  */
  67   if (!bfd_link_relocatable (&link_info)
  68       && is_elf_hash_table (link_info.hash))
  69     {
  70       for (sym = global_syms; *sym != NULL; sym++)
  71         {
  72           struct elf_link_hash_entry *h;
  73
  74           /* Lookup symbol.  */
  75           h = elf_link_hash_lookup (elf_hash_table (&link_info), *sym,
  76                                     false, false, false);
  77           if (h == NULL)
  78             continue;
  79
  80           /* Undo the hiding done by _bfd_elf_define_linkage_sym.  */
  81           h->forced_local = 0;
  82           h->other &= ~STV_HIDDEN;
  83
  84           /* Emit it into the .dynamic section, too.  */
  85           bfd_elf_link_record_dynamic_symbol (&link_info, h);
  86         }
  87
  88       for (sym = local_syms; *sym != NULL; sym++)
  89         {
  90           struct elf_link_hash_entry *h;
  91
  92           /* Lookup symbol.  */
  93           h = elf_link_hash_lookup (elf_hash_table (&link_info), *sym,
  94                                     false, false, false);
  95           if (h == NULL)
  96             continue;
  97
  98           /* Turn it local.  */
  99           h->forced_local = 1;
 100           /* Type should be STT_OBJECT, not STT_NOTYPE.  */
 101           h->type = STT_OBJECT;
 102         }
 103     }
 104
 105   /* Only do this if emitting a shared object and versioning is in place. */
 106   if (bfd_link_dll (&link_info)
 107       && ((link_info.version_info != NULL
 108            && link_info.version_info->name[0] != '\0')
 109           || link_info.create_default_symver))
 110     {
 111       struct bfd_elf_version_expr *globals = NULL, *locals = NULL;
 112       struct bfd_elf_version_tree *basever;
 113       const char *soname;
 114
 115       for (sym = global_syms; *sym != NULL; sym++)
 116         {
 117           /* Create a version pattern for this symbol.  Some of them start
 118              off as local, others as global, so try both.  */
 119           globals = lang_new_vers_pattern (globals, *sym, NULL, true);
 120           locals = lang_new_vers_pattern (locals, *sym, NULL, true);
 121         }
 122
 123       /* New version node for those symbols.  */
 124       basever = lang_new_vers_node (globals, locals);
 125
 126       /* The version name matches what bfd_elf_size_dynamic_sections uses
 127          for the base version.  */
 128       soname = bfd_elf_get_dt_soname (link_info.output_bfd);
 129       if (soname == NULL)
 130         soname = lbasename (bfd_get_filename (link_info.output_bfd));
 131
 132       /* Register the node.  */
 133       lang_register_vers_node (soname, basever, NULL);
 134       /* Enforce base version.  The encoded vd_ndx is vernum + 1.  */
 135       basever->vernum = 0;
 136     }
 137
 138   gld${EMULATION_NAME}_before_allocation ();
 139 }
 140
 141 EOF
 142
 143 LDEMUL_BEFORE_ALLOCATION=elf_solaris2_before_allocation