aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf-vxworks.c
blob: 77dfd02b7ca91c31e2107420a2407de8a02424ea (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/* VxWorks support for ELF
   Copyright (C) 2005-2014 Free Software Foundation, Inc.

   This file is part of BFD, the Binary File Descriptor library.

   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., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA.  */

/* This file provides routines used by all VxWorks targets.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf-vxworks.h"
#include "elf/vxworks.h"

/* Return true if symbol NAME, as defined by ABFD, is one of the special
   __GOTT_BASE__ or __GOTT_INDEX__ symbols.  */

static bfd_boolean
elf_vxworks_gott_symbol_p (bfd *abfd, const char *name)
{
  char leading;

  leading = bfd_get_symbol_leading_char (abfd);
  if (leading)
    {
      if (*name != leading)
	return FALSE;
      name++;
    }
  return (strcmp (name, "__GOTT_BASE__") == 0
	  || strcmp (name, "__GOTT_INDEX__") == 0);
}

/* Tweak magic VxWorks symbols as they are loaded.  */
bfd_boolean
elf_vxworks_add_symbol_hook (bfd *abfd,
			     struct bfd_link_info *info,
			     Elf_Internal_Sym *sym,
			     const char **namep,
			     flagword *flagsp,
			     asection **secp ATTRIBUTE_UNUSED,
			     bfd_vma *valp ATTRIBUTE_UNUSED)
{
  /* Ideally these "magic" symbols would be exported by libc.so.1
     which would be found via a DT_NEEDED tag, and then handled
     specially by the linker at runtime.  Except shared libraries
     don't even link to libc.so.1 by default...
     If the symbol is imported from, or will be put in a shared library,
     give the symbol weak binding to get the desired samantics.
     This transformation will be undone in
     elf_i386_vxworks_link_output_symbol_hook. */
  if ((info->shared || abfd->flags & DYNAMIC)
      && elf_vxworks_gott_symbol_p (abfd, *namep))
    {
      sym->st_info = ELF_ST_INFO (STB_WEAK, ELF_ST_TYPE (sym->st_info));
      *flagsp |= BSF_WEAK;
    }

  return TRUE;
}

/* Perform VxWorks-specific handling of the create_dynamic_sections hook.
   When creating an executable, set *SRELPLT2_OUT to the .rel(a).plt.unloaded
   section.  */

bfd_boolean
elf_vxworks_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info,
				     asection **srelplt2_out)
{
  struct elf_link_hash_table *htab;
  const struct elf_backend_data *bed;
  asection *s;

  htab = elf_hash_table (info);
  bed = get_elf_backend_data (dynobj);

  if (!info->shared)
    {
      s = bfd_make_section_anyway_with_flags (dynobj,
					      bed->default_use_rela_p
					      ? ".rela.plt.unloaded"
					      : ".rel.plt.unloaded",
					      SEC_HAS_CONTENTS | SEC_IN_MEMORY
					      | SEC_READONLY
					      | SEC_LINKER_CREATED);
      if (s == NULL
	  || !bfd_set_section_alignment (dynobj, s, bed->s->log_file_align))
	return FALSE;

      *srelplt2_out = s;
    }

  /* Mark the GOT and PLT symbols as having relocations; they might
     not, but we won't know for sure until we build the GOT in
     finish_dynamic_symbol.  Also make sure that the GOT symbol
     is entered into the dynamic symbol table; the loader uses it
     to initialize __GOTT_BASE__[__GOTT_INDEX__].  */
  if (htab->hgot)
    {
      htab->hgot->indx = -2;
      htab->hgot->other &= ~ELF_ST_VISIBILITY (-1);
      htab->hgot->forced_local = 0;
      if (!bfd_elf_link_record_dynamic_symbol (info, htab->hgot))
	return FALSE;
    }
  if (htab->hplt)
    {
      htab->hplt->indx = -2;
      htab->hplt->type = STT_FUNC;
    }

  return TRUE;
}

/* Tweak magic VxWorks symbols as they are written to the output file.  */
int
elf_vxworks_link_output_symbol_hook (struct bfd_link_info *info
				       ATTRIBUTE_UNUSED,
				     const char *name,
				     Elf_Internal_Sym *sym,
				     asection *input_sec ATTRIBUTE_UNUSED,
				     struct elf_link_hash_entry *h)
{
  /* Reverse the effects of the hack in elf_vxworks_add_symbol_hook.  */
  if (h
      && h->root.type == bfd_link_hash_undefweak
      && elf_vxworks_gott_symbol_p (h->root.u.undef.abfd, name))
    sym->st_info = ELF_ST_INFO (STB_GLOBAL, ELF_ST_TYPE (sym->st_info));

  return 1;
}

/* Copy relocations into the output file.  Fixes up relocations against PLT
   entries, then calls the generic routine.  */

bfd_boolean
elf_vxworks_emit_relocs (bfd *output_bfd,
			 asection *input_section,
			 Elf_Internal_Shdr *input_rel_hdr,
			 Elf_Internal_Rela *internal_relocs,
			 struct elf_link_hash_entry **rel_hash)
{
  const struct elf_backend_data *bed;
  int j;

  bed = get_elf_backend_data (output_bfd);

  if (output_bfd->flags & (DYNAMIC|EXEC_P))
    {
      Elf_Internal_Rela *irela;
      Elf_Internal_Rela *irelaend;
      struct elf_link_hash_entry **hash_ptr;

      for (irela = internal_relocs,
	     irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
				 * bed->s->int_rels_per_ext_rel),
	     hash_ptr = rel_hash;
	   irela < irelaend;
	   irela += bed->s->int_rels_per_ext_rel,
	     hash_ptr++)
	{
	  if (*hash_ptr
	      && (*hash_ptr)->def_dynamic
	      && !(*hash_ptr)->def_regular
	      && ((*hash_ptr)->root.type == bfd_link_hash_defined
		  || (*hash_ptr)->root.type == bfd_link_hash_defweak)
	      && (*hash_ptr)->root.u.def.section->output_section != NULL)
	    {
	      /* This is a relocation from an executable or shared
	         library against a symbol in a different shared
	         library.  We are creating a definition in the output
	         file but it does not come from any of our normal (.o)
	         files. ie. a PLT stub.  Normally this would be a
	         relocation against against SHN_UNDEF with the VMA of
	         the PLT stub.  This upsets the VxWorks loader.
	         Convert it to a section-relative relocation.  This
	         gets some other symbols (for instance .dynbss), but
	         is conservatively correct.  */
	      for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
		{
		  asection *sec = (*hash_ptr)->root.u.def.section;
		  int this_idx = sec->output_section->target_index;

		  irela[j].r_info
		    = ELF32_R_INFO (this_idx, ELF32_R_TYPE (irela[j].r_info));
		  irela[j].r_addend += (*hash_ptr)->root.u.def.value;
		  irela[j].r_addend += sec->output_offset;
		}
	      /* Stop the generic routine adjusting this entry.  */
	      *hash_ptr = NULL;
	    }
	}
    }
  return _bfd_elf_link_output_relocs (output_bfd, input_section,
				      input_rel_hdr, internal_relocs,
				      rel_hash);
}


/* Set the sh_link and sh_info fields on the static plt relocation secton.  */

void
elf_vxworks_final_write_processing (bfd *abfd,
				    bfd_boolean linker ATTRIBUTE_UNUSED)
{
  asection * sec;
  struct bfd_elf_section_data *d;

  sec = bfd_get_section_by_name (abfd, ".rel.plt.unloaded");
  if (!sec)
    sec = bfd_get_section_by_name (abfd, ".rela.plt.unloaded");
  if (!sec)
    return;
  d = elf_section_data (sec);
  d->this_hdr.sh_link = elf_onesymtab (abfd);
  sec = bfd_get_section_by_name (abfd, ".plt");
  if (sec)
    d->this_hdr.sh_info = elf_section_data (sec)->this_idx;
}

/* Add the dynamic entries required by VxWorks.  These point to the
   tls sections.  */

bfd_boolean
elf_vxworks_add_dynamic_entries (bfd *output_bfd, struct bfd_link_info *info)
{
  if (bfd_get_section_by_name (output_bfd, ".tls_data"))
    {
      if (!_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_START, 0)
	  || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_SIZE, 0)
	  || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_ALIGN, 0))
	return FALSE;
    }
  if (bfd_get_section_by_name (output_bfd, ".tls_vars"))
    {
      if (!_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_VARS_START, 0)
	  || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_VARS_SIZE, 0))
	return FALSE;
    }
  return TRUE;
}

/* If *DYN is one of the VxWorks-specific dynamic entries, then fill
   in the value now  and return TRUE.  Otherwise return FALSE.  */

bfd_boolean
elf_vxworks_finish_dynamic_entry (bfd *output_bfd, Elf_Internal_Dyn *dyn)
{
  asection *sec;

  switch (dyn->d_tag)
    {
    default:
      return FALSE;

    case DT_VX_WRS_TLS_DATA_START:
      sec = bfd_get_section_by_name (output_bfd, ".tls_data");
      dyn->d_un.d_ptr = sec->vma;
      break;

    case DT_VX_WRS_TLS_DATA_SIZE:
      sec = bfd_get_section_by_name (output_bfd, ".tls_data");
      dyn->d_un.d_val = sec->size;
      break;

    case DT_VX_WRS_TLS_DATA_ALIGN:
      sec = bfd_get_section_by_name (output_bfd, ".tls_data");
      dyn->d_un.d_val
	= (bfd_size_type)1 << bfd_get_section_alignment (output_bfd,
							 sec);
      break;

    case DT_VX_WRS_TLS_VARS_START:
      sec = bfd_get_section_by_name (output_bfd, ".tls_vars");
      dyn->d_un.d_ptr = sec->vma;
      break;

    case DT_VX_WRS_TLS_VARS_SIZE:
      sec = bfd_get_section_by_name (output_bfd, ".tls_vars");
      dyn->d_un.d_val = sec->size;
      break;
    }
  return TRUE;
}