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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [ld/] [ldwrite.c] - Blame information for rev 231

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/* ldwrite.c -- write out the linked file
2
   Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2002,
3
   2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
4
   Written by Steve Chamberlain sac@cygnus.com
5
 
6
   This file is part of the GNU Binutils.
7
 
8
   This program is free software; you can redistribute it and/or modify
9
   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 3 of the License, or
11
   (at your option) any later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program; if not, write to the Free Software
20
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21
   MA 02110-1301, USA.  */
22
 
23
#include "sysdep.h"
24
#include "bfd.h"
25
#include "bfdlink.h"
26
#include "libiberty.h"
27
#include "safe-ctype.h"
28
 
29
#include "ld.h"
30
#include "ldexp.h"
31
#include "ldlang.h"
32
#include "ldwrite.h"
33
#include "ldmisc.h"
34
#include <ldgram.h>
35
#include "ldmain.h"
36
 
37
/* Build link_order structures for the BFD linker.  */
38
 
39
static void
40
build_link_order (lang_statement_union_type *statement)
41
{
42
  switch (statement->header.type)
43
    {
44
    case lang_data_statement_enum:
45
      {
46
        asection *output_section;
47
        struct bfd_link_order *link_order;
48
        bfd_vma value;
49
        bfd_boolean big_endian = FALSE;
50
 
51
        output_section = statement->data_statement.output_section;
52
        ASSERT (output_section->owner == link_info.output_bfd);
53
 
54
        link_order = bfd_new_link_order (link_info.output_bfd, output_section);
55
        if (link_order == NULL)
56
          einfo (_("%P%F: bfd_new_link_order failed\n"));
57
 
58
        link_order->type = bfd_data_link_order;
59
        link_order->offset = statement->data_statement.output_offset;
60
        link_order->u.data.contents = xmalloc (QUAD_SIZE);
61
 
62
        value = statement->data_statement.value;
63
 
64
        /* If the endianness of the output BFD is not known, then we
65
           base the endianness of the data on the first input file.
66
           By convention, the bfd_put routines for an unknown
67
           endianness are big endian, so we must swap here if the
68
           input file is little endian.  */
69
        if (bfd_big_endian (link_info.output_bfd))
70
          big_endian = TRUE;
71
        else if (bfd_little_endian (link_info.output_bfd))
72
          big_endian = FALSE;
73
        else
74
          {
75
            bfd_boolean swap;
76
 
77
            swap = FALSE;
78
            if (command_line.endian == ENDIAN_BIG)
79
              big_endian = TRUE;
80
            else if (command_line.endian == ENDIAN_LITTLE)
81
              {
82
                big_endian = FALSE;
83
                swap = TRUE;
84
              }
85
            else if (command_line.endian == ENDIAN_UNSET)
86
              {
87
                big_endian = TRUE;
88
                {
89
                  LANG_FOR_EACH_INPUT_STATEMENT (s)
90
                    {
91
                      if (s->the_bfd != NULL)
92
                        {
93
                          if (bfd_little_endian (s->the_bfd))
94
                            {
95
                              big_endian = FALSE;
96
                              swap = TRUE;
97
                            }
98
                          break;
99
                        }
100
                    }
101
                }
102
              }
103
 
104
            if (swap)
105
              {
106
                bfd_byte buffer[8];
107
 
108
                switch (statement->data_statement.type)
109
                  {
110
                  case QUAD:
111
                  case SQUAD:
112
                    if (sizeof (bfd_vma) >= QUAD_SIZE)
113
                      {
114
                        bfd_putl64 (value, buffer);
115
                        value = bfd_getb64 (buffer);
116
                        break;
117
                      }
118
                    /* Fall through.  */
119
                  case LONG:
120
                    bfd_putl32 (value, buffer);
121
                    value = bfd_getb32 (buffer);
122
                    break;
123
                  case SHORT:
124
                    bfd_putl16 (value, buffer);
125
                    value = bfd_getb16 (buffer);
126
                    break;
127
                  case BYTE:
128
                    break;
129
                  default:
130
                    abort ();
131
                  }
132
              }
133
          }
134
 
135
        ASSERT (output_section->owner == link_info.output_bfd);
136
        switch (statement->data_statement.type)
137
          {
138
          case QUAD:
139
          case SQUAD:
140
            if (sizeof (bfd_vma) >= QUAD_SIZE)
141
              bfd_put_64 (link_info.output_bfd, value,
142
                          link_order->u.data.contents);
143
            else
144
              {
145
                bfd_vma high;
146
 
147
                if (statement->data_statement.type == QUAD)
148
                  high = 0;
149
                else if ((value & 0x80000000) == 0)
150
                  high = 0;
151
                else
152
                  high = (bfd_vma) -1;
153
                bfd_put_32 (link_info.output_bfd, high,
154
                            (link_order->u.data.contents
155
                             + (big_endian ? 0 : 4)));
156
                bfd_put_32 (link_info.output_bfd, value,
157
                            (link_order->u.data.contents
158
                             + (big_endian ? 4 : 0)));
159
              }
160
            link_order->size = QUAD_SIZE;
161
            break;
162
          case LONG:
163
            bfd_put_32 (link_info.output_bfd, value,
164
                        link_order->u.data.contents);
165
            link_order->size = LONG_SIZE;
166
            break;
167
          case SHORT:
168
            bfd_put_16 (link_info.output_bfd, value,
169
                        link_order->u.data.contents);
170
            link_order->size = SHORT_SIZE;
171
            break;
172
          case BYTE:
173
            bfd_put_8 (link_info.output_bfd, value,
174
                       link_order->u.data.contents);
175
            link_order->size = BYTE_SIZE;
176
            break;
177
          default:
178
            abort ();
179
          }
180
      }
181
      break;
182
 
183
    case lang_reloc_statement_enum:
184
      {
185
        lang_reloc_statement_type *rs;
186
        asection *output_section;
187
        struct bfd_link_order *link_order;
188
 
189
        rs = &statement->reloc_statement;
190
 
191
        output_section = rs->output_section;
192
        ASSERT (output_section->owner == link_info.output_bfd);
193
 
194
        link_order = bfd_new_link_order (link_info.output_bfd, output_section);
195
        if (link_order == NULL)
196
          einfo (_("%P%F: bfd_new_link_order failed\n"));
197
 
198
        link_order->offset = rs->output_offset;
199
        link_order->size = bfd_get_reloc_size (rs->howto);
200
 
201
        link_order->u.reloc.p = xmalloc (sizeof (struct bfd_link_order_reloc));
202
 
203
        link_order->u.reloc.p->reloc = rs->reloc;
204
        link_order->u.reloc.p->addend = rs->addend_value;
205
 
206
        if (rs->name == NULL)
207
          {
208
            link_order->type = bfd_section_reloc_link_order;
209
            if (rs->section->owner == link_info.output_bfd)
210
              link_order->u.reloc.p->u.section = rs->section;
211
            else
212
              {
213
                link_order->u.reloc.p->u.section = rs->section->output_section;
214
                link_order->u.reloc.p->addend += rs->section->output_offset;
215
              }
216
          }
217
        else
218
          {
219
            link_order->type = bfd_symbol_reloc_link_order;
220
            link_order->u.reloc.p->u.name = rs->name;
221
          }
222
      }
223
      break;
224
 
225
    case lang_input_section_enum:
226
      {
227
        /* Create a new link_order in the output section with this
228
           attached */
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
          {
234
            asection *output_section = i->output_section;
235
 
236
            ASSERT (output_section->owner == link_info.output_bfd);
237
 
238
            if ((output_section->flags & SEC_HAS_CONTENTS) != 0
239
                || ((output_section->flags & SEC_LOAD) != 0
240
                    && (output_section->flags & SEC_THREAD_LOCAL)))
241
              {
242
                struct bfd_link_order *link_order;
243
 
244
                link_order = bfd_new_link_order (link_info.output_bfd,
245
                                                 output_section);
246
 
247
                if (i->flags & SEC_NEVER_LOAD)
248
                  {
249
                    /* We've got a never load section inside one which
250
                       is going to be output, we'll change it into a
251
                       fill.  */
252
                    link_order->type = bfd_data_link_order;
253
                    link_order->u.data.contents = (unsigned char *) "";
254
                    link_order->u.data.size = 1;
255
                  }
256
                else
257
                  {
258
                    link_order->type = bfd_indirect_link_order;
259
                    link_order->u.indirect.section = i;
260
                    ASSERT (i->output_section == output_section);
261
                  }
262
                link_order->size = i->size;
263
                link_order->offset = i->output_offset;
264
              }
265
          }
266
      }
267
      break;
268
 
269
    case lang_padding_statement_enum:
270
      /* Make a new link_order with the right filler */
271
      {
272
        asection *output_section;
273
        struct bfd_link_order *link_order;
274
 
275
        output_section = statement->padding_statement.output_section;
276
        ASSERT (statement->padding_statement.output_section->owner
277
                == link_info.output_bfd);
278
        if (((output_section->flags & SEC_HAS_CONTENTS) != 0
279
             || ((output_section->flags & SEC_LOAD) != 0
280
                 && (output_section->flags & SEC_THREAD_LOCAL)))
281
            && (output_section->flags & SEC_NEVER_LOAD) == 0)
282
          {
283
            link_order = bfd_new_link_order (link_info.output_bfd,
284
                                             output_section);
285
            link_order->type = bfd_data_link_order;
286
            link_order->size = statement->padding_statement.size;
287
            link_order->offset = statement->padding_statement.output_offset;
288
            link_order->u.data.contents = statement->padding_statement.fill->data;
289
            link_order->u.data.size = statement->padding_statement.fill->size;
290
          }
291
      }
292
      break;
293
 
294
    default:
295
      /* All the other ones fall through */
296
      break;
297
    }
298
}
299
 
300
/* Return true if NAME is the name of an unsplittable section. These
301
   are the stabs strings, dwarf strings.  */
302
 
303
static bfd_boolean
304
unsplittable_name (const char *name)
305
{
306
  if (CONST_STRNEQ (name, ".stab"))
307
    {
308
      /* There are several stab like string sections. We pattern match on
309
         ".stab...str"  */
310
      unsigned len = strlen (name);
311
      if (strcmp (&name[len-3], "str") == 0)
312
        return TRUE;
313
    }
314
  else if (strcmp (name, "$GDB_STRINGS$") == 0)
315
    return TRUE;
316
  return FALSE;
317
}
318
 
319
/* Wander around the input sections, make sure that
320
   we'll never try and create an output section with more relocs
321
   than will fit.. Do this by always assuming the worst case, and
322
   creating new output sections with all the right bits.  */
323
#define TESTIT 1
324
static asection *
325
clone_section (bfd *abfd, asection *s, const char *name, int *count)
326
{
327
  char *tname;
328
  char *sname;
329
  unsigned int len;
330
  asection *n;
331
  struct bfd_link_hash_entry *h;
332
 
333
  /* Invent a section name from the section name and a dotted numeric
334
     suffix.   */
335
  len = strlen (name);
336
  tname = xmalloc (len + 1);
337
  memcpy (tname, name, len + 1);
338
  /* Remove a dotted number suffix, from a previous split link. */
339
  while (len && ISDIGIT (tname[len-1]))
340
    len--;
341
  if (len > 1 && tname[len-1] == '.')
342
    /* It was a dotted number. */
343
    tname[len-1] = 0;
344
 
345
  /* We want to use the whole of the original section name for the
346
     split name, but coff can be restricted to 8 character names.  */
347
  if (bfd_family_coff (abfd) && strlen (tname) > 5)
348
    {
349
      /* Some section names cannot be truncated, as the name is
350
         used to locate some other section.  */
351
      if (CONST_STRNEQ (name, ".stab")
352
          || strcmp (name, "$GDB_SYMBOLS$") == 0)
353
        {
354
          einfo (_ ("%F%P: cannot create split section name for %s\n"), name);
355
          /* Silence gcc warnings.  einfo exits, so we never reach here.  */
356
          return NULL;
357
        }
358
      tname[5] = 0;
359
    }
360
 
361
  if ((sname = bfd_get_unique_section_name (abfd, tname, count)) == NULL
362
      || (n = bfd_make_section_anyway (abfd, sname)) == NULL
363
      || (h = bfd_link_hash_lookup (link_info.hash,
364
                                    sname, TRUE, TRUE, FALSE)) == NULL)
365
    {
366
      einfo (_("%F%P: clone section failed: %E\n"));
367
      /* Silence gcc warnings.  einfo exits, so we never reach here.  */
368
      return NULL;
369
    }
370
  free (tname);
371
 
372
  /* Set up section symbol.  */
373
  h->type = bfd_link_hash_defined;
374
  h->u.def.value = 0;
375
  h->u.def.section = n;
376
 
377
  n->flags = s->flags;
378
  n->vma = s->vma;
379
  n->user_set_vma = s->user_set_vma;
380
  n->lma = s->lma;
381
  n->size = 0;
382
  n->output_offset = s->output_offset;
383
  n->output_section = n;
384
  n->orelocation = 0;
385
  n->reloc_count = 0;
386
  n->alignment_power = s->alignment_power;
387
  return n;
388
}
389
 
390
#if TESTING
391
static void
392
ds (asection *s)
393
{
394
  struct bfd_link_order *l = s->map_head.link_order;
395
  printf ("vma %x size %x\n", s->vma, s->size);
396
  while (l)
397
    {
398
      if (l->type == bfd_indirect_link_order)
399
        {
400
          printf ("%8x %s\n", l->offset, l->u.indirect.section->owner->filename);
401
        }
402
      else
403
        {
404
          printf (_("%8x something else\n"), l->offset);
405
        }
406
      l = l->next;
407
    }
408
  printf ("\n");
409
}
410
 
411
dump (char *s, asection *a1, asection *a2)
412
{
413
  printf ("%s\n", s);
414
  ds (a1);
415
  ds (a2);
416
}
417
 
418
static void
419
sanity_check (bfd *abfd)
420
{
421
  asection *s;
422
  for (s = abfd->sections; s; s = s->next)
423
    {
424
      struct bfd_link_order *p;
425
      bfd_vma prev = 0;
426
      for (p = s->map_head.link_order; p; p = p->next)
427
        {
428
          if (p->offset > 100000)
429
            abort ();
430
          if (p->offset < prev)
431
            abort ();
432
          prev = p->offset;
433
        }
434
    }
435
}
436
#else
437
#define sanity_check(a)
438
#define dump(a, b, c)
439
#endif
440
 
441
static void
442
split_sections (bfd *abfd, struct bfd_link_info *info)
443
{
444
  asection *original_sec;
445
  int nsecs = abfd->section_count;
446
  sanity_check (abfd);
447
  /* Look through all the original sections.  */
448
  for (original_sec = abfd->sections;
449
       original_sec && nsecs;
450
       original_sec = original_sec->next, nsecs--)
451
    {
452
      int count = 0;
453
      unsigned int lines = 0;
454
      unsigned int relocs = 0;
455
      bfd_size_type sec_size = 0;
456
      struct bfd_link_order *l;
457
      struct bfd_link_order *p;
458
      bfd_vma vma = original_sec->vma;
459
      asection *cursor = original_sec;
460
 
461
      /* Count up the relocations and line entries to see if anything
462
         would be too big to fit.  Accumulate section size too.  */
463
      for (l = NULL, p = cursor->map_head.link_order; p != NULL; p = l->next)
464
        {
465
          unsigned int thislines = 0;
466
          unsigned int thisrelocs = 0;
467
          bfd_size_type thissize = 0;
468
          if (p->type == bfd_indirect_link_order)
469
            {
470
              asection *sec;
471
 
472
              sec = p->u.indirect.section;
473
 
474
              if (info->strip == strip_none
475
                  || info->strip == strip_some)
476
                thislines = sec->lineno_count;
477
 
478
              if (info->relocatable)
479
                thisrelocs = sec->reloc_count;
480
 
481
              thissize = sec->size;
482
 
483
            }
484
          else if (info->relocatable
485
                   && (p->type == bfd_section_reloc_link_order
486
                       || p->type == bfd_symbol_reloc_link_order))
487
            thisrelocs++;
488
 
489
          if (l != NULL
490
              && (thisrelocs + relocs >= config.split_by_reloc
491
                  || thislines + lines >= config.split_by_reloc
492
                  || (thissize + sec_size >= config.split_by_file))
493
              && !unsplittable_name (cursor->name))
494
            {
495
              /* Create a new section and put this link order and the
496
                 following link orders into it.  */
497
              bfd_vma shift_offset;
498
              asection *n;
499
 
500
              n = clone_section (abfd, cursor, original_sec->name, &count);
501
 
502
              /* Attach the link orders to the new section and snip
503
                 them off from the old section.  */
504
              n->map_head.link_order = p;
505
              n->map_tail.link_order = cursor->map_tail.link_order;
506
              cursor->map_tail.link_order = l;
507
              l->next = NULL;
508
              l = p;
509
 
510
              /* Change the size of the original section and
511
                 update the vma of the new one.  */
512
 
513
              dump ("before snip", cursor, n);
514
 
515
              shift_offset = p->offset;
516
              n->size = cursor->size - shift_offset;
517
              cursor->size = shift_offset;
518
 
519
              vma += shift_offset;
520
              n->lma = n->vma = vma;
521
 
522
              /* Run down the chain and change the output section to
523
                 the right one, update the offsets too.  */
524
              do
525
                {
526
                  p->offset -= shift_offset;
527
                  if (p->type == bfd_indirect_link_order)
528
                    {
529
                      p->u.indirect.section->output_section = n;
530
                      p->u.indirect.section->output_offset = p->offset;
531
                    }
532
                  p = p->next;
533
                }
534
              while (p);
535
 
536
              dump ("after snip", cursor, n);
537
              cursor = n;
538
              relocs = thisrelocs;
539
              lines = thislines;
540
              sec_size = thissize;
541
            }
542
          else
543
            {
544
              l = p;
545
              relocs += thisrelocs;
546
              lines += thislines;
547
              sec_size += thissize;
548
            }
549
        }
550
    }
551
  sanity_check (abfd);
552
}
553
 
554
/* Call BFD to write out the linked file.  */
555
 
556
void
557
ldwrite (void)
558
{
559
  /* Reset error indicator, which can typically something like invalid
560
     format from opening up the .o files.  */
561
  bfd_set_error (bfd_error_no_error);
562
  lang_for_each_statement (build_link_order);
563
 
564
  if (config.split_by_reloc != (unsigned) -1
565
      || config.split_by_file != (bfd_size_type) -1)
566
    split_sections (link_info.output_bfd, &link_info);
567
  if (!bfd_final_link (link_info.output_bfd, &link_info))
568
    {
569
      /* If there was an error recorded, print it out.  Otherwise assume
570
         an appropriate error message like unknown symbol was printed
571
         out.  */
572
 
573
      if (bfd_get_error () != bfd_error_no_error)
574
        einfo (_("%F%P: final link failed: %E\n"));
575
      else
576
        xexit (1);
577
    }
578
}

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