aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf32-sh-symbian.c
blob: 58c607a84cb34812aa9637e59c52ba17852563c3 (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
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
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
/* Renesas / SuperH specific support for Symbian 32-bit ELF files
   Copyright (C) 2004-2016 Free Software Foundation, Inc.
   Contributed by Red Hat

   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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */


/* Stop elf32-sh.c from defining any target vectors.  */
#define SH_TARGET_ALREADY_DEFINED
#define sh_find_elf_flags           sh_symbian_find_elf_flags
#define sh_elf_get_flags_from_mach  sh_symbian_elf_get_flags_from_mach
#include "elf32-sh.c"


//#define SYMBIAN_DEBUG 1
#define SYMBIAN_DEBUG 0

#define DIRECTIVE_HEADER	"#<SYMEDIT>#\n"
#define DIRECTIVE_IMPORT	"IMPORT "
#define DIRECTIVE_EXPORT	"EXPORT "
#define DIRECTIVE_AS		"AS "

/* Macro to advance 's' until either it reaches 'e' or the
   character pointed to by 's' is equal to 'c'.  If 'e' is
   reached and SYMBIAN_DEBUG is enabled then the error message 'm'
   is displayed.  */
#define SKIP_UNTIL(s,e,c,m)					\
  do								\
    {								\
      while (s < e && *s != c)					\
	++ s;							\
      if (s >= e)						\
	{							\
          if (SYMBIAN_DEBUG)					\
	    fprintf (stderr, "Corrupt directive: %s\n", m);	\
	  result = FALSE;					\
	}							\
    }								\
  while (0);							\
  if (!result)							\
     break;

/* Like SKIP_UNTIL except there are two terminator characters
   c1 and c2.  */
#define SKIP_UNTIL2(s,e,c1,c2,m)				\
  do								\
    {								\
      while (s < e && *s != c1 && *s != c2)			\
	++ s;							\
      if (s >= e)						\
	{							\
          if (SYMBIAN_DEBUG)					\
	    fprintf (stderr, "Corrupt directive: %s\n", m);	\
	  result = FALSE;					\
	}							\
    }								\
  while (0);							\
  if (!result)							\
     break;

/* Macro to advance 's' until either it reaches 'e' or the
   character pointed to by 's' is not equal to 'c'.  If 'e'
   is reached and SYMBIAN_DEBUG is enabled then the error message
   'm' is displayed.  */
#define SKIP_WHILE(s,e,c,m)					\
  do								\
    {								\
      while (s < e && *s == c)					\
	++ s;							\
      if (s >= e)						\
	{							\
          if (SYMBIAN_DEBUG)					\
	    fprintf (stderr, "Corrupt directive: %s\n", m);	\
	  result = FALSE;					\
	}							\
    }								\
  while (0);							\
  if (!result)							\
     break;


typedef struct symbol_rename
{
  struct symbol_rename *       next;
  char *                       current_name;
  char *                       new_name;
  struct elf_link_hash_entry * current_hash;
  unsigned long                new_symndx;
}
symbol_rename;

static symbol_rename * rename_list = NULL;

/* Accumulate a list of symbols to be renamed.  */

static bfd_boolean
sh_symbian_import_as (struct bfd_link_info *info, bfd * abfd,
		      char * current_name, char * new_name)
{
  struct elf_link_hash_entry * new_hash;
  symbol_rename * node;

  if (SYMBIAN_DEBUG)
    fprintf (stderr, "IMPORT '%s' AS '%s'\n", current_name, new_name);

  for (node = rename_list; node; node = node->next)
    if (strcmp (node->current_name, current_name) == 0)
      {
	if (strcmp (node->new_name, new_name) == 0)
	  /* Already added to rename list.  */
	  return TRUE;

	bfd_set_error (bfd_error_invalid_operation);
	_bfd_error_handler (_("%B: IMPORT AS directive for %s conceals previous IMPORT AS"),
			    abfd, current_name);
	return FALSE;
      }

  if ((node = bfd_malloc (sizeof * node)) == NULL)
    {
      if (SYMBIAN_DEBUG)
	fprintf (stderr, "IMPORT AS: No mem for new rename node\n");
      return FALSE;
    }

  if ((node->current_name = bfd_malloc (strlen (current_name) + 1)) == NULL)
    {
      if (SYMBIAN_DEBUG)
	fprintf (stderr, "IMPORT AS: No mem for current name field in rename node\n");
      free (node);
      return FALSE;
    }
  else
    strcpy (node->current_name, current_name);

  if ((node->new_name = bfd_malloc (strlen (new_name) + 1)) == NULL)
    {
      if (SYMBIAN_DEBUG)
	fprintf (stderr, "IMPORT AS: No mem for new name field in rename node\n");
      free (node->current_name);
      free (node);
      return FALSE;
    }
  else
    strcpy (node->new_name, new_name);

  node->next = rename_list;
  node->current_hash = NULL;
  node->new_symndx = 0;
  rename_list = node;

  new_hash = elf_link_hash_lookup (elf_hash_table (info), node->new_name, TRUE, FALSE, TRUE);
  bfd_elf_link_record_dynamic_symbol (info, new_hash);
  if (new_hash->root.type == bfd_link_hash_new)
    new_hash->root.type = bfd_link_hash_undefined;

  return TRUE;
}


static bfd_boolean
sh_symbian_import (bfd * abfd ATTRIBUTE_UNUSED, char * name)
{
  if (SYMBIAN_DEBUG)
    fprintf (stderr, "IMPORT '%s'\n", name);

  /* XXX: Generate an import somehow ?  */

  return TRUE;
}

static bfd_boolean
sh_symbian_export (bfd * abfd ATTRIBUTE_UNUSED, char * name)
{
  if (SYMBIAN_DEBUG)
    fprintf (stderr, "EXPORT '%s'\n", name);

  /* XXX: Generate an export somehow ?  */

  return TRUE;
}

/* Process any magic embedded commands in the .directive. section.
   Returns TRUE upon sucecss, but if it fails it sets bfd_error and
   returns FALSE.  */

static bfd_boolean
sh_symbian_process_embedded_commands (struct bfd_link_info *info, bfd * abfd,
				      asection * sec, bfd_byte * contents)
{
  char *s;
  char *e;
  bfd_boolean result = TRUE;
  bfd_size_type sz = sec->rawsize ? sec->rawsize : sec->size;

  for (s = (char *) contents, e = s + sz; s < e;)
    {
      char * directive = s;

      switch (*s)
	{
	  /* I want to use "case DIRECTIVE_HEADER [0]:" here but gcc won't let me :-(  */
	case '#':
	  if (strcmp (s, DIRECTIVE_HEADER))
	    result = FALSE;
	  else
	    /* Just ignore the header.
	       XXX: Strictly speaking we ought to check that the header
	       is present and that it is the first thing in the file.  */
	    s += strlen (DIRECTIVE_HEADER) + 1;
	  break;

	case 'I':
	  if (! CONST_STRNEQ (s, DIRECTIVE_IMPORT))
	    result = FALSE;
	  else
	    {
	      char * new_name;
	      char * new_name_end;
	      char   name_end_char;

	      /* Skip the IMPORT directive.  */
	      s += strlen (DIRECTIVE_IMPORT);

	      new_name = s;
	      /* Find the end of the new name.  */
	      while (s < e && *s != ' ' && *s != '\n')
		++ s;
	      if (s >= e)
		{
		  /* We have reached the end of the .directive section
		     without encountering a string terminator.  This is
		     allowed for IMPORT directives.  */
		  new_name_end   = e - 1;
		  name_end_char  = * new_name_end;
		  * new_name_end = 0;
		  result = sh_symbian_import (abfd, new_name);
		  * new_name_end = name_end_char;
		  break;
		}

	      /* Remember where the name ends.  */
	      new_name_end = s;
	      /* Skip any whitespace before the 'AS'.  */
	      SKIP_WHILE (s, e, ' ', "IMPORT: Name just followed by spaces");
	      /* Terminate the new name.  (Do this after skiping...)  */
	      name_end_char = * new_name_end;
	      * new_name_end = 0;

	      /* Check to see if 'AS '... is present.  If so we have an
		 IMPORT AS directive, otherwise we have an IMPORT directive.  */
	      if (! CONST_STRNEQ (s, DIRECTIVE_AS))
		{
		  /* Skip the new-line at the end of the name.  */
		  if (SYMBIAN_DEBUG && name_end_char != '\n')
		    fprintf (stderr, "IMPORT: No newline at end of directive\n");
		  else
		    s ++;

		  result = sh_symbian_import (abfd, new_name);

		  /* Skip past the NUL character.  */
		  if (* s ++ != 0)
		    {
		      if (SYMBIAN_DEBUG)
			fprintf (stderr, "IMPORT: No NUL at end of directive\n");
		    }
		}
	      else
		{
		  char * current_name;
		  char * current_name_end;
		  char   current_name_end_char;

		  /* Skip the 'AS '.  */
		  s += strlen (DIRECTIVE_AS);
		  /* Skip any white space after the 'AS '.  */
		  SKIP_WHILE (s, e, ' ', "IMPORT AS: Nothing after AS");
		  current_name = s;
		  /* Find the end of the current name.  */
		  SKIP_UNTIL2 (s, e, ' ', '\n', "IMPORT AS: No newline at the end of the current name");
		  /* Skip (backwards) over spaces at the end of the current name.  */
		  current_name_end = s;
		  current_name_end_char = * current_name_end;

		  SKIP_WHILE (s, e, ' ', "IMPORT AS: Current name just followed by spaces");
		  /* Skip past the newline character.  */
		  if (* s ++ != '\n')
		    if (SYMBIAN_DEBUG)
		      fprintf (stderr, "IMPORT AS: No newline at end of directive\n");

		  /* Terminate the current name after having performed the skips.  */
		  * current_name_end = 0;

		  result = sh_symbian_import_as (info, abfd, current_name, new_name);

		  /* The next character should be a NUL.  */
		  if (* s != 0)
		    {
		      if (SYMBIAN_DEBUG)
			fprintf (stderr, "IMPORT AS: Junk at end of directive\n");
		      result = FALSE;
		    }
		  s ++;

		  * current_name_end = current_name_end_char;
		}

	      /* Restore the characters we overwrote, since
		 the .directive section will be emitted.  */
	      * new_name_end = name_end_char;
	    }
	  break;

	case 'E':
	  if (! CONST_STRNEQ (s, DIRECTIVE_EXPORT))
	    result = FALSE;
	  else
	    {
	      char * name;
	      char * name_end;
	      char   name_end_char;

	      /* Skip the directive.  */
	      s += strlen (DIRECTIVE_EXPORT);
	      name = s;
	      /* Find the end of the name to be exported.  */
	      SKIP_UNTIL (s, e, '\n', "EXPORT: no newline at end of directive");
	      /* Skip (backwards) over spaces at end of exported name.  */
	      for (name_end = s; name_end[-1] == ' '; name_end --)
		;
	      /* name_end now points at the first character after the
		 end of the exported name, so we can termiante it  */
	      name_end_char = * name_end;
	      * name_end = 0;
	      /* Skip passed the newline character.  */
	      s ++;

	      result = sh_symbian_export (abfd, name);

	      /* The next character should be a NUL.  */
	      if (* s != 0)
		{
		  if (SYMBIAN_DEBUG)
		    fprintf (stderr, "EXPORT: Junk at end of directive\n");
		  result = FALSE;
		}
	      s++;

	      /* Restore the character we deleted.  */
	      * name_end = name_end_char;
	    }
	  break;

	default:
	  result = FALSE;
	  break;
	}

      if (! result)
	{
	  if (SYMBIAN_DEBUG)
	    fprintf (stderr, "offset into .directive section: %ld\n",
		     (long) (directive - (char *) contents));

	  bfd_set_error (bfd_error_invalid_operation);
	  _bfd_error_handler (_("%B: Unrecognised .directive command: %s"),
			      abfd, directive);
	  break;
	}
    }

  return result;
}


/* Scan a bfd for a .directive section, and if found process it.
   Returns TRUE upon success, FALSE otherwise.  */

static bfd_boolean
sh_symbian_process_directives (bfd *abfd, struct bfd_link_info *info)
{
  bfd_boolean result = FALSE;
  bfd_byte *  contents;
  asection *  sec = bfd_get_section_by_name (abfd, ".directive");
  bfd_size_type sz;

  if (!sec)
    return TRUE;

  sz = sec->rawsize ? sec->rawsize : sec->size;
  contents = bfd_malloc (sz);

  if (!contents)
    bfd_set_error (bfd_error_no_memory);
  else
    {
      if (bfd_get_section_contents (abfd, sec, contents, 0, sz))
	result = sh_symbian_process_embedded_commands (info, abfd, sec, contents);
      free (contents);
    }

  return result;
}

/* Intercept the normal sh_relocate_section() function
   and magle the relocs to allow for symbol renaming.  */

static bfd_boolean
sh_symbian_relocate_section (bfd *                  output_bfd,
			     struct bfd_link_info * info,
			     bfd *                  input_bfd,
			     asection *             input_section,
			     bfd_byte *             contents,
			     Elf_Internal_Rela *    relocs,
			     Elf_Internal_Sym *     local_syms,
			     asection **            local_sections)
{
  /* When performing a final link we implement the IMPORT AS directives.  */
  if (!bfd_link_relocatable (info))
    {
      Elf_Internal_Rela *            rel;
      Elf_Internal_Rela *            relend;
      Elf_Internal_Shdr *            symtab_hdr;
      struct elf_link_hash_entry **  sym_hashes;
      struct elf_link_hash_entry **  sym_hashes_end;
      struct elf_link_hash_table *   hash_table;
      symbol_rename *                ptr;
      bfd_size_type                  num_global_syms;
      unsigned long		     num_local_syms;

      BFD_ASSERT (! elf_bad_symtab (input_bfd));

      symtab_hdr       = & elf_tdata (input_bfd)->symtab_hdr;
      hash_table       = elf_hash_table (info);
      num_local_syms   = symtab_hdr->sh_info;
      num_global_syms  = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
      num_global_syms -= num_local_syms;
      sym_hashes       = elf_sym_hashes (input_bfd);
      sym_hashes_end   = sym_hashes + num_global_syms;

      /* First scan the rename table, caching the hash entry and the new index.  */
      for (ptr = rename_list; ptr; ptr = ptr->next)
	{
	  struct elf_link_hash_entry *   new_hash;
	  struct elf_link_hash_entry **  h;

	  ptr->current_hash = elf_link_hash_lookup (hash_table, ptr->current_name, FALSE, FALSE, TRUE);

	  if (ptr->current_hash == NULL)
	    {
	      if (SYMBIAN_DEBUG)
		fprintf (stderr, "IMPORT AS: current symbol '%s' does not exist\n", ptr->current_name);
	      continue;
	    }

	  new_hash = elf_link_hash_lookup (hash_table, ptr->new_name,
					   FALSE, FALSE, TRUE);
	  /* If we could not find the symbol then it is a new, undefined symbol.
	     Symbian want this behaviour - ie they want to be able to rename the
	     reference in a reloc from one undefined symbol to another, new and
	     undefined symbol.  So we create that symbol here.  */
	  if (new_hash == NULL)
	    {
	      struct bfd_link_hash_entry *bh = NULL;
	      bfd_boolean collect = get_elf_backend_data (input_bfd)->collect;
	      if (_bfd_generic_link_add_one_symbol (info, input_bfd,
						    ptr->new_name, BSF_GLOBAL,
						    bfd_und_section_ptr, 0,
						    NULL, FALSE, collect,
						    &bh))
		{
		  new_hash = (struct elf_link_hash_entry *) bh;
		  new_hash->type = STT_FUNC;
		  new_hash->non_elf = 0;

		  if (SYMBIAN_DEBUG)
		    fprintf (stderr, "Created new symbol %s\n", ptr->new_name);
		}
	    }

	  if (new_hash == NULL)
	    {
	      _bfd_error_handler (_("%B: Failed to add renamed symbol %s"),
				  input_bfd, ptr->new_name);
	      continue;
	    }

	  /* Convert the new_hash value into a index into the table of symbol hashes.  */
	  for (h = sym_hashes; h < sym_hashes_end; h ++)
	    {
	      if (* h == new_hash)
		{
		  ptr->new_symndx = h - sym_hashes + num_local_syms;
		  if (SYMBIAN_DEBUG)
		    fprintf (stderr, "Converted new hash to index of %ld\n", ptr->new_symndx);
		  break;
		}
	    }
	  /* If the new symbol is not in the hash table then it must be
	     because it is one of the newly created undefined symbols
	     manufactured above.  So we extend the sym has table here to
	     include this extra symbol.  */
	  if (h == sym_hashes_end)
	    {
	      struct elf_link_hash_entry **  new_sym_hashes;

	      /* This is not very efficient, but it works.  */
	      ++ num_global_syms;
	      new_sym_hashes = bfd_alloc (input_bfd, num_global_syms * sizeof * sym_hashes);
	      if (new_sym_hashes == NULL)
		{
		  if (SYMBIAN_DEBUG)
		    fprintf (stderr, "Out of memory extending hash table\n");
		  continue;
		}
	      memcpy (new_sym_hashes, sym_hashes, (num_global_syms - 1) * sizeof * sym_hashes);
	      new_sym_hashes[num_global_syms - 1] = new_hash;
	      elf_sym_hashes (input_bfd) = sym_hashes = new_sym_hashes;
	      sym_hashes_end = sym_hashes + num_global_syms;
	      symtab_hdr->sh_size  = (num_global_syms + num_local_syms) * sizeof (Elf32_External_Sym);

	      ptr->new_symndx = num_global_syms - 1 + num_local_syms;

	      if (SYMBIAN_DEBUG)
		fprintf (stderr, "Extended symbol hash table to insert new symbol as index %ld\n",
			 ptr->new_symndx);
	    }
	}

      /* Walk the reloc list looking for references to renamed symbols.
	 When we find one, we alter the index in the reloc to point to the new symbol.  */
      for (rel = relocs, relend = relocs + input_section->reloc_count;
	   rel < relend;
	   rel ++)
	{
	  int                          r_type;
	  unsigned long                r_symndx;
	  struct elf_link_hash_entry * h;

	  r_symndx = ELF32_R_SYM (rel->r_info);
	  r_type = ELF32_R_TYPE (rel->r_info);

	  /* Ignore unused relocs.  */
	  if ((r_type >= (int) R_SH_GNU_VTINHERIT
	       && r_type <= (int) R_SH_LABEL)
	      || r_type == (int) R_SH_NONE
	      || r_type < 0
	      || r_type >= R_SH_max)
	    continue;

	  /* Ignore relocs against local symbols.  */
	  if (r_symndx < num_local_syms)
	    continue;

	  BFD_ASSERT (r_symndx < (num_global_syms + num_local_syms));
	  h = sym_hashes[r_symndx - num_local_syms];
	  BFD_ASSERT (h != NULL);

	  while (   h->root.type == bfd_link_hash_indirect
		 || h->root.type == bfd_link_hash_warning)
	    h = (struct elf_link_hash_entry *) h->root.u.i.link;

	  /* If the symbol is defined there is no need to rename it.
	     XXX - is this true ?  */
	  if (   h->root.type == bfd_link_hash_defined
	      || h->root.type == bfd_link_hash_defweak
	      || h->root.type == bfd_link_hash_undefweak)
	    continue;

	  for (ptr = rename_list; ptr; ptr = ptr->next)
	    if (h == ptr->current_hash)
	      {
		BFD_ASSERT (ptr->new_symndx);
		if (SYMBIAN_DEBUG)
		  fprintf (stderr, "convert reloc %lx from using index %ld to using index %ld\n",
			   (unsigned long) rel->r_info,
			   (long) ELF32_R_SYM (rel->r_info), ptr->new_symndx);
		rel->r_info = ELF32_R_INFO (ptr->new_symndx, r_type);
		break;
	      }
	}
    }

  return sh_elf_relocate_section (output_bfd, info, input_bfd, input_section,
				  contents, relocs, local_syms, local_sections);
}

#define TARGET_LITTLE_SYM	sh_elf32_symbian_le_vec
#define TARGET_LITTLE_NAME      "elf32-shl-symbian"

#undef  elf_backend_relocate_section
#define elf_backend_relocate_section	sh_symbian_relocate_section
#undef  elf_backend_check_directives
#define elf_backend_check_directives    sh_symbian_process_directives

#include "elf32-target.h"