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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [ld/] [emultempl/] [hppaelf.em] - Blame information for rev 146

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1 145 khays
# This shell script emits a C file. -*- C -*-
2
#   Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
3
#   2005, 2006, 2007, 2008, 2009 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
  after_parse_default ();
64
}
65
 
66
/* This is called before the input files are opened.  We create a new
67
   fake input file to hold the stub sections.  */
68
 
69
static void
70
hppaelf_create_output_section_statements (void)
71
{
72
  if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
73
        && (elf_object_id (link_info.output_bfd) == HPPA32_ELF_DATA
74
            || elf_object_id (link_info.output_bfd) == HPPA64_ELF_DATA)))
75
    return;
76
 
77
  stub_file = lang_add_input_file ("linker stubs",
78
                                   lang_input_file_is_fake_enum,
79
                                   NULL);
80
  stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
81
  if (stub_file->the_bfd == NULL
82
      || ! bfd_set_arch_mach (stub_file->the_bfd,
83
                              bfd_get_arch (link_info.output_bfd),
84
                              bfd_get_mach (link_info.output_bfd)))
85
    {
86
      einfo ("%X%P: can not create BFD %E\n");
87
      return;
88
    }
89
 
90
  stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
91
  ldlang_add_file (stub_file);
92
}
93
 
94
 
95
struct hook_stub_info
96
{
97
  lang_statement_list_type add;
98
  asection *input_section;
99
};
100
 
101
/* Traverse the linker tree to find the spot where the stub goes.  */
102
 
103
static bfd_boolean
104
hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
105
{
106
  lang_statement_union_type *l;
107
  bfd_boolean ret;
108
 
109
  for (; (l = *lp) != NULL; lp = &l->header.next)
110
    {
111
      switch (l->header.type)
112
        {
113
        case lang_constructors_statement_enum:
114
          ret = hook_in_stub (info, &constructor_list.head);
115
          if (ret)
116
            return ret;
117
          break;
118
 
119
        case lang_output_section_statement_enum:
120
          ret = hook_in_stub (info,
121
                              &l->output_section_statement.children.head);
122
          if (ret)
123
            return ret;
124
          break;
125
 
126
        case lang_wild_statement_enum:
127
          ret = hook_in_stub (info, &l->wild_statement.children.head);
128
          if (ret)
129
            return ret;
130
          break;
131
 
132
        case lang_group_statement_enum:
133
          ret = hook_in_stub (info, &l->group_statement.children.head);
134
          if (ret)
135
            return ret;
136
          break;
137
 
138
        case lang_input_section_enum:
139
          if (l->input_section.section == info->input_section)
140
            {
141
              /* We've found our section.  Insert the stub immediately
142
                 before its associated input section.  */
143
              *lp = info->add.head;
144
              *(info->add.tail) = l;
145
              return TRUE;
146
            }
147
          break;
148
 
149
        case lang_data_statement_enum:
150
        case lang_reloc_statement_enum:
151
        case lang_object_symbols_statement_enum:
152
        case lang_output_statement_enum:
153
        case lang_target_statement_enum:
154
        case lang_input_statement_enum:
155
        case lang_assignment_statement_enum:
156
        case lang_padding_statement_enum:
157
        case lang_address_statement_enum:
158
        case lang_fill_statement_enum:
159
          break;
160
 
161
        default:
162
          FAIL ();
163
          break;
164
        }
165
    }
166
  return FALSE;
167
}
168
 
169
 
170
/* Call-back for elf32_hppa_size_stubs.  */
171
 
172
/* Create a new stub section, and arrange for it to be linked
173
   immediately before INPUT_SECTION.  */
174
 
175
static asection *
176
hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
177
{
178
  asection *stub_sec;
179
  flagword flags;
180
  asection *output_section;
181
  const char *secname;
182
  lang_output_section_statement_type *os;
183
  struct hook_stub_info info;
184
 
185
  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
186
           | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
187
  stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
188
                                                 stub_sec_name, flags);
189
  if (stub_sec == NULL)
190
    goto err_ret;
191
 
192
  output_section = input_section->output_section;
193
  secname = bfd_get_section_name (output_section->owner, output_section);
194
  os = lang_output_section_find (secname);
195
 
196
  info.input_section = input_section;
197
  lang_list_init (&info.add);
198
  lang_add_section (&info.add, stub_sec, os);
199
 
200
  if (info.add.head == NULL)
201
    goto err_ret;
202
 
203
  if (hook_in_stub (&info, &os->children.head))
204
    return stub_sec;
205
 
206
 err_ret:
207
  einfo ("%X%P: can not make stub section: %E\n");
208
  return NULL;
209
}
210
 
211
 
212
/* Another call-back for elf32_hppa_size_stubs.  */
213
 
214
static void
215
hppaelf_layout_sections_again (void)
216
{
217
  /* If we have changed sizes of the stub sections, then we need
218
     to recalculate all the section offsets.  This may mean we need to
219
     add even more stubs.  */
220
  gld${EMULATION_NAME}_map_segments (TRUE);
221
  need_laying_out = -1;
222
}
223
 
224
 
225
static void
226
build_section_lists (lang_statement_union_type *statement)
227
{
228
  if (statement->header.type == lang_input_section_enum)
229
    {
230
      asection *i = statement->input_section.section;
231
 
232
      if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
233
          && (i->flags & SEC_EXCLUDE) == 0
234
          && i->output_section != NULL
235
          && i->output_section->owner == link_info.output_bfd)
236
        {
237
          elf32_hppa_next_input_section (&link_info, i);
238
        }
239
    }
240
}
241
 
242
 
243
/* For the PA we use this opportunity to size and build linker stubs.  */
244
 
245
static void
246
gld${EMULATION_NAME}_after_allocation (void)
247
{
248
  /* bfd_elf_discard_info just plays with data and debugging sections,
249
     ie. doesn't affect code size, 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
 
308
 
309
/* Avoid processing the fake stub_file in vercheck, stat_needed and
310
   check_needed routines.  */
311
 
312
static void (*real_func) (lang_input_statement_type *);
313
 
314
static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
315
{
316
  if (l != stub_file)
317
    (*real_func) (l);
318
}
319
 
320
static void
321
hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
322
{
323
  real_func = func;
324
  lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
325
}
326
 
327
#define lang_for_each_input_file hppa_lang_for_each_input_file
328
 
329
EOF
330
 
331
# Define some shell vars to insert bits of code into the standard elf
332
# parse_args and list_options functions.
333
#
334
PARSE_AND_LIST_PROLOGUE='
335
#define OPTION_MULTI_SUBSPACE           301
336
#define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
337
'
338
 
339
PARSE_AND_LIST_LONGOPTS='
340
  { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
341
  { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
342
'
343
 
344
PARSE_AND_LIST_OPTIONS='
345
  fprintf (file, _("\
346
  --multi-subspace            Generate import and export stubs to support\n\
347
                                multiple sub-space shared libraries\n"
348
                   ));
349
  fprintf (file, _("\
350
  --stub-group-size=N         Maximum size of a group of input sections that\n\
351
                                can be handled by one stub section.  A negative\n\
352
                                value locates all stubs before their branches\n\
353
                                (with a group size of -N), while a positive\n\
354
                                value allows two groups of input sections, one\n\
355
                                before, and one after each stub section.\n\
356
                                Values of +/-1 indicate the linker should\n\
357
                                choose suitable defaults.\n"
358
                   ));
359
'
360
 
361
PARSE_AND_LIST_ARGS_CASES='
362
    case OPTION_MULTI_SUBSPACE:
363
      multi_subspace = 1;
364
      break;
365
 
366
    case OPTION_STUBGROUP_SIZE:
367
      {
368
        const char *end;
369
        group_size = bfd_scan_vma (optarg, &end, 0);
370
        if (*end)
371
          einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
372
      }
373
      break;
374
'
375
 
376
# Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
377
#
378
LDEMUL_AFTER_PARSE=hppaelf_after_parse
379
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
380
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements

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