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[/] [openrisc/] [trunk/] [gnu-old/] [binutils-2.18.50/] [ld/] [emultempl/] [hppaelf.em] - Blame information for rev 856

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1 38 julius
# This shell script emits a C file. -*- C -*-
2
#   Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
3
#   2005, 2007, 2008 Free Software Foundation, Inc.
4
#
5
# This file is part of the GNU Binutils.
6
#
7
# This program is free software; you can redistribute it and/or modify
8
# it under the terms of the GNU General Public License as published by
9
# the Free Software Foundation; either version 3 of the License, or
10
# (at your option) any later version.
11
#
12
# This program is distributed in the hope that it will be useful,
13
# but WITHOUT ANY WARRANTY; without even the implied warranty of
14
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
# GNU General Public License for more details.
16
#
17
# You should have received a copy of the GNU General Public License
18
# along with this program; if not, write to the Free Software
19
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20
# MA 02110-1301, USA.
21
#
22
 
23
# This file is sourced from elf32.em, and defines extra hppa-elf
24
# specific routines.
25
#
26
fragment <
27
 
28
#include "ldctor.h"
29
#include "elf32-hppa.h"
30
 
31
 
32
/* Fake input file for stubs.  */
33
static lang_input_statement_type *stub_file;
34
 
35
/* Type of import/export stubs to build.  For a single sub-space model,
36
   we can build smaller import stubs and there is no need for export
37
   stubs.  */
38
static int multi_subspace = 0;
39
 
40
/* Whether we need to call hppa_layout_sections_again.  */
41
static int need_laying_out = 0;
42
 
43
/* Maximum size of a group of input sections that can be handled by
44
   one stub section.  A value of +/-1 indicates the bfd back-end
45
   should use a suitable default size.  */
46
static bfd_signed_vma group_size = 1;
47
 
48
/* Stops the linker merging .text sections on a relocatable link,
49
   and adds millicode library to the list of input files.  */
50
 
51
static void
52
hppaelf_after_parse (void)
53
{
54
  if (link_info.relocatable)
55
    lang_add_unique (".text");
56
 
57
  /* Enable this once we split millicode stuff from libgcc:
58
     lang_add_input_file ("milli",
59
                          lang_input_file_is_l_enum,
60
                          NULL);
61
  */
62
}
63
 
64
/* This is called before the input files are opened.  We create a new
65
   fake input file to hold the stub sections.  */
66
 
67
static void
68
hppaelf_create_output_section_statements (void)
69
{
70
  if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
71
        && elf_object_id (link_info.output_bfd) == HPPA_ELF_TDATA))
72
    return;
73
 
74
  stub_file = lang_add_input_file ("linker stubs",
75
                                   lang_input_file_is_fake_enum,
76
                                   NULL);
77
  stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
78
  if (stub_file->the_bfd == NULL
79
      || ! bfd_set_arch_mach (stub_file->the_bfd,
80
                              bfd_get_arch (link_info.output_bfd),
81
                              bfd_get_mach (link_info.output_bfd)))
82
    {
83
      einfo ("%X%P: can not create BFD %E\n");
84
      return;
85
    }
86
 
87
  stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
88
  ldlang_add_file (stub_file);
89
}
90
 
91
 
92
struct hook_stub_info
93
{
94
  lang_statement_list_type add;
95
  asection *input_section;
96
};
97
 
98
/* Traverse the linker tree to find the spot where the stub goes.  */
99
 
100
static bfd_boolean
101
hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
102
{
103
  lang_statement_union_type *l;
104
  bfd_boolean ret;
105
 
106
  for (; (l = *lp) != NULL; lp = &l->header.next)
107
    {
108
      switch (l->header.type)
109
        {
110
        case lang_constructors_statement_enum:
111
          ret = hook_in_stub (info, &constructor_list.head);
112
          if (ret)
113
            return ret;
114
          break;
115
 
116
        case lang_output_section_statement_enum:
117
          ret = hook_in_stub (info,
118
                              &l->output_section_statement.children.head);
119
          if (ret)
120
            return ret;
121
          break;
122
 
123
        case lang_wild_statement_enum:
124
          ret = hook_in_stub (info, &l->wild_statement.children.head);
125
          if (ret)
126
            return ret;
127
          break;
128
 
129
        case lang_group_statement_enum:
130
          ret = hook_in_stub (info, &l->group_statement.children.head);
131
          if (ret)
132
            return ret;
133
          break;
134
 
135
        case lang_input_section_enum:
136
          if (l->input_section.section == info->input_section)
137
            {
138
              /* We've found our section.  Insert the stub immediately
139
                 before its associated input section.  */
140
              *lp = info->add.head;
141
              *(info->add.tail) = l;
142
              return TRUE;
143
            }
144
          break;
145
 
146
        case lang_data_statement_enum:
147
        case lang_reloc_statement_enum:
148
        case lang_object_symbols_statement_enum:
149
        case lang_output_statement_enum:
150
        case lang_target_statement_enum:
151
        case lang_input_statement_enum:
152
        case lang_assignment_statement_enum:
153
        case lang_padding_statement_enum:
154
        case lang_address_statement_enum:
155
        case lang_fill_statement_enum:
156
          break;
157
 
158
        default:
159
          FAIL ();
160
          break;
161
        }
162
    }
163
  return FALSE;
164
}
165
 
166
 
167
/* Call-back for elf32_hppa_size_stubs.  */
168
 
169
/* Create a new stub section, and arrange for it to be linked
170
   immediately before INPUT_SECTION.  */
171
 
172
static asection *
173
hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
174
{
175
  asection *stub_sec;
176
  flagword flags;
177
  asection *output_section;
178
  const char *secname;
179
  lang_output_section_statement_type *os;
180
  struct hook_stub_info info;
181
 
182
  stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
183
  if (stub_sec == NULL)
184
    goto err_ret;
185
 
186
  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
187
           | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
188
  if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
189
    goto err_ret;
190
 
191
  output_section = input_section->output_section;
192
  secname = bfd_get_section_name (output_section->owner, output_section);
193
  os = lang_output_section_find (secname);
194
 
195
  info.input_section = input_section;
196
  lang_list_init (&info.add);
197
  lang_add_section (&info.add, stub_sec, os);
198
 
199
  if (info.add.head == NULL)
200
    goto err_ret;
201
 
202
  if (hook_in_stub (&info, &os->children.head))
203
    return stub_sec;
204
 
205
 err_ret:
206
  einfo ("%X%P: can not make stub section: %E\n");
207
  return NULL;
208
}
209
 
210
 
211
/* Another call-back for elf32_hppa_size_stubs.  */
212
 
213
static void
214
hppaelf_layout_sections_again (void)
215
{
216
  /* If we have changed sizes of the stub sections, then we need
217
     to recalculate all the section offsets.  This may mean we need to
218
     add even more stubs.  */
219
  gld${EMULATION_NAME}_map_segments (TRUE);
220
  need_laying_out = -1;
221
}
222
 
223
 
224
static void
225
build_section_lists (lang_statement_union_type *statement)
226
{
227
  if (statement->header.type == lang_input_section_enum)
228
    {
229
      asection *i = statement->input_section.section;
230
 
231
      if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
232
          && (i->flags & SEC_EXCLUDE) == 0
233
          && i->output_section != NULL
234
          && i->output_section->owner == link_info.output_bfd)
235
        {
236
          elf32_hppa_next_input_section (&link_info, i);
237
        }
238
    }
239
}
240
 
241
 
242
/* Final emulation specific call.  For the PA we use this opportunity
243
   to build linker stubs.  */
244
 
245
static void
246
gld${EMULATION_NAME}_finish (void)
247
{
248
  /* bfd_elf_discard_info just plays with debugging sections,
249
     ie. doesn't affect any code, so we can delay resizing the
250
     sections.  It's likely we'll resize everything in the process of
251
     adding stubs.  */
252
  if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
253
    need_laying_out = 1;
254
 
255
  /* If generating a relocatable output file, then we don't
256
     have to examine the relocs.  */
257
  if (stub_file != NULL && !link_info.relocatable)
258
    {
259
      int ret = elf32_hppa_setup_section_lists (link_info.output_bfd,
260
                                                &link_info);
261
 
262
      if (ret != 0)
263
        {
264
          if (ret < 0)
265
            {
266
              einfo ("%X%P: can not size stub section: %E\n");
267
              return;
268
            }
269
 
270
          lang_for_each_statement (build_section_lists);
271
 
272
          /* Call into the BFD backend to do the real work.  */
273
          if (! elf32_hppa_size_stubs (link_info.output_bfd,
274
                                       stub_file->the_bfd,
275
                                       &link_info,
276
                                       multi_subspace,
277
                                       group_size,
278
                                       &hppaelf_add_stub_section,
279
                                       &hppaelf_layout_sections_again))
280
            {
281
              einfo ("%X%P: can not size stub section: %E\n");
282
              return;
283
            }
284
        }
285
    }
286
 
287
  if (need_laying_out != -1)
288
    gld${EMULATION_NAME}_map_segments (need_laying_out);
289
 
290
  if (! link_info.relocatable)
291
    {
292
      /* Set the global data pointer.  */
293
      if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
294
        {
295
          einfo ("%X%P: can not set gp\n");
296
          return;
297
        }
298
 
299
      /* Now build the linker stubs.  */
300
      if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
301
        {
302
          if (! elf32_hppa_build_stubs (&link_info))
303
            einfo ("%X%P: can not build stubs: %E\n");
304
        }
305
    }
306
 
307
  finish_default ();
308
}
309
 
310
 
311
/* Avoid processing the fake stub_file in vercheck, stat_needed and
312
   check_needed routines.  */
313
 
314
static void (*real_func) (lang_input_statement_type *);
315
 
316
static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
317
{
318
  if (l != stub_file)
319
    (*real_func) (l);
320
}
321
 
322
static void
323
hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
324
{
325
  real_func = func;
326
  lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
327
}
328
 
329
#define lang_for_each_input_file hppa_lang_for_each_input_file
330
 
331
EOF
332
 
333
# Define some shell vars to insert bits of code into the standard elf
334
# parse_args and list_options functions.
335
#
336
PARSE_AND_LIST_PROLOGUE='
337
#define OPTION_MULTI_SUBSPACE           301
338
#define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
339
'
340
 
341
PARSE_AND_LIST_LONGOPTS='
342
  { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
343
  { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
344
'
345
 
346
PARSE_AND_LIST_OPTIONS='
347
  fprintf (file, _("\
348
  --multi-subspace            Generate import and export stubs to support\n\
349
                                multiple sub-space shared libraries\n"
350
                   ));
351
  fprintf (file, _("\
352
  --stub-group-size=N         Maximum size of a group of input sections that\n\
353
                                can be handled by one stub section.  A negative\n\
354
                                value locates all stubs before their branches\n\
355
                                (with a group size of -N), while a positive\n\
356
                                value allows two groups of input sections, one\n\
357
                                before, and one after each stub section.\n\
358
                                Values of +/-1 indicate the linker should\n\
359
                                choose suitable defaults.\n"
360
                   ));
361
'
362
 
363
PARSE_AND_LIST_ARGS_CASES='
364
    case OPTION_MULTI_SUBSPACE:
365
      multi_subspace = 1;
366
      break;
367
 
368
    case OPTION_STUBGROUP_SIZE:
369
      {
370
        const char *end;
371
        group_size = bfd_scan_vma (optarg, &end, 0);
372
        if (*end)
373
          einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
374
      }
375
      break;
376
'
377
 
378
# Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
379
#
380
LDEMUL_AFTER_PARSE=hppaelf_after_parse
381
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
382
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements

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