File: ldemul.c

package info (click to toggle)
binutils 2.25.1-7
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 240,664 kB
  • sloc: ansic: 1,329,744; asm: 553,510; cpp: 110,550; exp: 58,489; makefile: 52,218; sh: 19,523; yacc: 14,700; lisp: 13,606; perl: 1,791; lex: 1,626; pascal: 307; sed: 195; python: 154; awk: 26
file content (357 lines) | stat: -rw-r--r-- 7,853 bytes parent folder | download | duplicates (5)
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
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
/* ldemul.c -- clearing house for ld emulation states
   Copyright (C) 1991-2014 Free Software Foundation, Inc.

   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.  */

#include "sysdep.h"
#include "bfd.h"
#include "getopt.h"
#include "bfdlink.h"

#include "ld.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldfile.h"
#include "ldemul.h"
#include "ldmain.h"
#include "ldemul-list.h"

static ld_emulation_xfer_type *ld_emulation;

void
ldemul_hll (char *name)
{
  ld_emulation->hll (name);
}

void
ldemul_syslib (char *name)
{
  ld_emulation->syslib (name);
}

void
ldemul_after_parse (void)
{
  ld_emulation->after_parse ();
}

void
ldemul_before_parse (void)
{
  ld_emulation->before_parse ();
}

void
ldemul_after_open (void)
{
  ld_emulation->after_open ();
}

void
ldemul_after_allocation (void)
{
  ld_emulation->after_allocation ();
}

void
ldemul_before_allocation (void)
{
  ld_emulation->before_allocation ();
}

void
ldemul_set_output_arch (void)
{
  ld_emulation->set_output_arch ();
}

void
ldemul_finish (void)
{
  ld_emulation->finish ();
}

void
ldemul_set_symbols (void)
{
  if (ld_emulation->set_symbols)
    ld_emulation->set_symbols ();
}

void
ldemul_create_output_section_statements (void)
{
  if (ld_emulation->create_output_section_statements)
    ld_emulation->create_output_section_statements ();
}

char *
ldemul_get_script (int *isfile)
{
  return ld_emulation->get_script (isfile);
}

bfd_boolean
ldemul_open_dynamic_archive (const char *arch, search_dirs_type *search,
			     lang_input_statement_type *entry)
{
  if (ld_emulation->open_dynamic_archive)
    return (*ld_emulation->open_dynamic_archive) (arch, search, entry);
  return FALSE;
}

lang_output_section_statement_type *
ldemul_place_orphan (asection *s, const char *name, int constraint)
{
  if (ld_emulation->place_orphan)
    return (*ld_emulation->place_orphan) (s, name, constraint);
  return NULL;
}

void
ldemul_add_options (int ns, char **shortopts, int nl,
		    struct option **longopts, int nrl,
		    struct option **really_longopts)
{
  if (ld_emulation->add_options)
    (*ld_emulation->add_options) (ns, shortopts, nl, longopts,
				  nrl, really_longopts);
}

bfd_boolean
ldemul_handle_option (int optc)
{
  if (ld_emulation->handle_option)
    return (*ld_emulation->handle_option) (optc);
  return FALSE;
}

bfd_boolean
ldemul_parse_args (int argc, char **argv)
{
  /* Try and use the emulation parser if there is one.  */
  if (ld_emulation->parse_args)
    return (*ld_emulation->parse_args) (argc, argv);
  return FALSE;
}

/* Let the emulation code handle an unrecognized file.  */

bfd_boolean
ldemul_unrecognized_file (lang_input_statement_type *entry)
{
  if (ld_emulation->unrecognized_file)
    return (*ld_emulation->unrecognized_file) (entry);
  return FALSE;
}

/* Let the emulation code handle a recognized file.  */

bfd_boolean
ldemul_recognized_file (lang_input_statement_type *entry)
{
  if (ld_emulation->recognized_file)
    return (*ld_emulation->recognized_file) (entry);
  return FALSE;
}

char *
ldemul_choose_target (int argc, char **argv)
{
  return ld_emulation->choose_target (argc, argv);
}


/* The default choose_target function.  */

char *
ldemul_default_target (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
{
  char *from_outside = getenv (TARGET_ENVIRON);
  if (from_outside != (char *) NULL)
    return from_outside;
  return ld_emulation->target_name;
}

/* If the entry point was not specified as an address, then add the
   symbol as undefined.  This will cause ld to extract an archive
   element defining the entry if ld is linking against such an archive.

   We don't do this when generating shared libraries unless given -e
   on the command line, because most shared libs are not designed to
   be run as an executable.  However, some are, eg. glibc ld.so and
   may rely on the default linker script supplying ENTRY.  So we can't
   remove the ENTRY from the script, but would rather not insert
   undefined _start syms.  */

void
after_parse_default (void)
{
  if (entry_symbol.name != NULL
      && (link_info.executable || entry_from_cmdline))
    {
      bfd_boolean is_vma = FALSE;

      if (entry_from_cmdline)
	{
	  const char *send;

	  bfd_scan_vma (entry_symbol.name, &send, 0);
	  is_vma = *send == '\0';
	}
      if (!is_vma)
	ldlang_add_undef (entry_symbol.name, entry_from_cmdline);
    }
}

void
after_open_default (void)
{
}

void
after_allocation_default (void)
{
  lang_relax_sections (FALSE);
}

void
before_allocation_default (void)
{
  if (!link_info.relocatable)
    strip_excluded_output_sections ();
}

void
finish_default (void)
{
  if (!link_info.relocatable)
    _bfd_fix_excluded_sec_syms (link_info.output_bfd, &link_info);
}

void
set_output_arch_default (void)
{
  /* Set the output architecture and machine if possible.  */
  bfd_set_arch_mach (link_info.output_bfd,
		     ldfile_output_architecture, ldfile_output_machine);

  bfd_emul_set_maxpagesize (output_target, config.maxpagesize);
  bfd_emul_set_commonpagesize (output_target, config.commonpagesize);
}

void
syslib_default (char *ignore ATTRIBUTE_UNUSED)
{
  info_msg (_("%S SYSLIB ignored\n"), NULL);
}

void
hll_default (char *ignore ATTRIBUTE_UNUSED)
{
  info_msg (_("%S HLL ignored\n"), NULL);
}

ld_emulation_xfer_type *ld_emulations[] = { EMULATION_LIST };

void
ldemul_choose_mode (char *target)
{
  ld_emulation_xfer_type **eptr = ld_emulations;
  /* Ignore "gld" prefix.  */
  if (target[0] == 'g' && target[1] == 'l' && target[2] == 'd')
    target += 3;
  for (; *eptr; eptr++)
    {
      if (strcmp (target, (*eptr)->emulation_name) == 0)
	{
	  ld_emulation = *eptr;
	  return;
	}
    }
  einfo (_("%P: unrecognised emulation mode: %s\n"), target);
  einfo (_("Supported emulations: "));
  ldemul_list_emulations (stderr);
  einfo ("%F\n");
}

void
ldemul_list_emulations (FILE *f)
{
  ld_emulation_xfer_type **eptr = ld_emulations;
  bfd_boolean first = TRUE;

  for (; *eptr; eptr++)
    {
      if (first)
	first = FALSE;
      else
	fprintf (f, " ");
      fprintf (f, "%s", (*eptr)->emulation_name);
    }
}

void
ldemul_list_emulation_options (FILE *f)
{
  ld_emulation_xfer_type **eptr;
  int options_found = 0;

  for (eptr = ld_emulations; *eptr; eptr++)
    {
      ld_emulation_xfer_type *emul = *eptr;

      if (emul->list_options)
	{
	  fprintf (f, "%s: \n", emul->emulation_name);

	  emul->list_options (f);

	  options_found = 1;
	}
    }

  if (! options_found)
    fprintf (f, _("  no emulation specific options.\n"));
}

int
ldemul_find_potential_libraries (char *name, lang_input_statement_type *entry)
{
  if (ld_emulation->find_potential_libraries)
    return ld_emulation->find_potential_libraries (name, entry);

  return 0;
}

struct bfd_elf_version_expr *
ldemul_new_vers_pattern (struct bfd_elf_version_expr *entry)
{
  if (ld_emulation->new_vers_pattern)
    entry = (*ld_emulation->new_vers_pattern) (entry);
  return entry;
}

void
ldemul_extra_map_file_text (bfd *abfd, struct bfd_link_info *info, FILE *mapf)
{
  if (ld_emulation->extra_map_file_text)
    ld_emulation->extra_map_file_text (abfd, info, mapf);
}