aboutsummaryrefslogtreecommitdiff
path: root/ld/emultempl/solaris2.em
blob: 9845047d275b57b44a8ef5a49c1665751d01c83b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
# This shell script emits a C file. -*- C -*-
# It does some substitutions.
if [ -z "$MACHINE" ]; then
  OUTPUT_ARCH=${ARCH}
else
  OUTPUT_ARCH=${ARCH}:${MACHINE}
fi
fragment <<EOF
/* This file is generated by a shell script.  DO NOT EDIT! */

/* Solaris 2 emulation code for ${EMULATION_NAME}
   Copyright (C) 2010-2017 Free Software Foundation, Inc.
   Written by Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>

   This file is part of the GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#define TARGET_IS_${EMULATION_NAME}

/* The Solaris 2 ABI requires some global symbols to be present in the
   .dynsym table of executables and shared objects.  If generating a
   versioned shared object, they must always be bound to the base version.

   Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
   File, p.63.  */
static void
elf_solaris2_before_allocation (void)
{
  /* Global symbols required by the Solaris 2 ABI.  */
  static const char *global_syms[] = {
    "_DYNAMIC",
    "_GLOBAL_OFFSET_TABLE_",
    "_PROCEDURE_LINKAGE_TABLE_",
    "_edata",
    "_end",
    "_etext",
    NULL
  };
  const char **sym;

  /* Do this for both executables and shared objects.  */
  if (!bfd_link_relocatable (&link_info))
    {
      for (sym = global_syms; *sym != NULL; sym++)
	{
	  struct elf_link_hash_entry *h;

	  /* Lookup symbol.  */
	  h = elf_link_hash_lookup (elf_hash_table (&link_info), *sym,
				    FALSE, FALSE, FALSE);
	  if (h == NULL)
	    continue;

	  /* Undo the hiding done by _bfd_elf_define_linkage_sym.  */
	  h->forced_local = 0;
	  h->other &= ~STV_HIDDEN;

	  /* Emit it into the .dynamic section, too.  */
	  bfd_elf_link_record_dynamic_symbol (&link_info, h);
	}
    }

  /* Only do this if emitting a shared object and versioning is in place. */
  if (bfd_link_dll (&link_info)
      && (link_info.version_info != NULL
	  || link_info.create_default_symver))
    {
      struct bfd_elf_version_expr *globals = NULL, *locals = NULL;
      struct bfd_elf_version_tree *basever;
      const char *soname;

      for (sym = global_syms; *sym != NULL; sym++)
	{
	  /* Create a version pattern for this symbol.  Some of them start
	     off as local, others as global, so try both.  */
	  globals = lang_new_vers_pattern (globals, *sym, NULL, TRUE);
	  locals = lang_new_vers_pattern (locals, *sym, NULL, TRUE);
	}

      /* New version node for those symbols.  */
      basever = lang_new_vers_node (globals, locals);

      /* The version name matches what bfd_elf_size_dynamic_sections uses
	 for the base version.  */
      soname = bfd_elf_get_dt_soname (link_info.output_bfd);
      if (soname == NULL)
	soname = lbasename (bfd_get_filename (link_info.output_bfd));

      /* Register the node.  */
      lang_register_vers_node (soname, basever, NULL);
      /* Enforce base version.  The encoded vd_ndx is vernum + 1.  */
      basever->vernum = 0;
    }

  gld${EMULATION_NAME}_before_allocation ();
}

/* The Solaris 2 ABI requires two local symbols to be emitted for every
   executable and shared object.

   Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
   File, p.63.  */
static void
elf_solaris2_after_allocation (void)
{
  /* Local symbols required by the Solaris 2 ABI.  Already emitted by
     emulparams/solaris2.sh.  */
  static const char *local_syms[] = {
    "_START_",
    "_END_",
    NULL
  };
  const char **sym;

  /* Do this for both executables and shared objects.  */
  if (!bfd_link_relocatable (&link_info))
    {
      for (sym = local_syms; *sym != NULL; sym++)
	{
	  struct elf_link_hash_entry *h;

	  /* Lookup symbol.  */
	  h = elf_link_hash_lookup (elf_hash_table (&link_info), *sym,
				    FALSE, FALSE, FALSE);
	  if (h == NULL)
	    continue;

	  /* Turn it local.  */
	  h->forced_local = 1;
	  /* Type should be STT_OBJECT, not STT_NOTYPE.  */
	  h->type = STT_OBJECT;
	}
    }

  gld${EMULATION_NAME}_after_allocation ();
}

EOF

LDEMUL_BEFORE_ALLOCATION=elf_solaris2_before_allocation
LDEMUL_AFTER_ALLOCATION=elf_solaris2_after_allocation