aboutsummaryrefslogtreecommitdiff
path: root/ld/emultempl/sunos.em
blob: 64e5ea5dd458dea098aeb3dffe2fe2865efa00b6 (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
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
# This shell script emits a C file. -*- C -*-
# It does some substitutions.
if [ -z "$MACHINE" ]; then 
  OUTPUT_ARCH=${ARCH}
else
  OUTPUT_ARCH=${ARCH}:${MACHINE}
fi
cat >e${EMULATION_NAME}.c <<EOF
/* This file is is generated by a shell script.  DO NOT EDIT! */

/* SunOS emulation code for ${EMULATION_NAME}
   Copyright 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
   Free Software Foundation, Inc.
   Written by Steve Chamberlain <sac@cygnus.com>
   SunOS shared library support by Ian Lance Taylor <ian@cygnus.com>

This file is part of GLD, the Gnu Linker.

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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#define TARGET_IS_${EMULATION_NAME}

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libiberty.h"
#include "safe-ctype.h"

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

#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif

static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
static void gld${EMULATION_NAME}_set_symbols PARAMS ((void));
static void gld${EMULATION_NAME}_create_output_section_statements
  PARAMS ((void));
static void gld${EMULATION_NAME}_find_so
  PARAMS ((lang_input_statement_type *));
static char *gld${EMULATION_NAME}_search_dir
  PARAMS ((const char *, const char *, boolean *));
static void gld${EMULATION_NAME}_after_open PARAMS ((void));
static void gld${EMULATION_NAME}_check_needed
  PARAMS ((lang_input_statement_type *));
static boolean gld${EMULATION_NAME}_search_needed
  PARAMS ((const char *, const char *));
static boolean gld${EMULATION_NAME}_try_needed
  PARAMS ((const char *, const char *));
static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
static void gld${EMULATION_NAME}_find_assignment
  PARAMS ((lang_statement_union_type *));
static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
static void gld${EMULATION_NAME}_count_need
  PARAMS ((lang_input_statement_type *));
static void gld${EMULATION_NAME}_set_need
  PARAMS ((lang_input_statement_type *));
static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));

static void
gld${EMULATION_NAME}_before_parse()
{
  const bfd_arch_info_type *arch = bfd_scan_arch ("${OUTPUT_ARCH}");
  if (arch)
    {
      ldfile_output_architecture = arch->arch;
      ldfile_output_machine = arch->mach;
      ldfile_output_machine_name = arch->printable_name;
    }
  else
    ldfile_output_architecture = bfd_arch_${ARCH};
  config.dynamic_link = true;
  config.has_shared = true;
}

/* This is called after the command line arguments have been parsed,
   but before the linker script has been read.  If this is a native
   linker, we add the directories in LD_LIBRARY_PATH to the search
   list.  */

static void
gld${EMULATION_NAME}_set_symbols ()
{
EOF
if [ "x${host}" = "x${target}" ] ; then
  case " ${EMULATION_LIBPATH} " in
  *" ${EMULATION_NAME} "*)
cat >>e${EMULATION_NAME}.c <<EOF
  const char *env;

  env = (const char *) getenv ("LD_LIBRARY_PATH");
  if (env != NULL)
    {
      char *l;

      l = xstrdup (env);
      while (1)
	{
	  char *c;

	  c = strchr (l, ':');
	  if (c != NULL)
	    *c++ = '\0';
	  if (*l != '\0')
	    ldfile_add_library_path (l, false);
	  if (c == NULL)
	    break;
	  l = c;
	}
    }
EOF
  ;;
  esac
fi
cat >>e${EMULATION_NAME}.c <<EOF
}

/* Despite the name, we use this routine to search for dynamic
   libraries.  On SunOS this requires a directory search.  We need to
   find the .so file with the highest version number.  The user may
   restrict the major version by saying, e.g., -lc.1.  Also, if we
   find a .so file, we need to look for a the same file after
   replacing .so with .sa; if it exists, it will be an archive which
   provide some initializations for data symbols, and we need to
   search it after including the .so file.  */

static void
gld${EMULATION_NAME}_create_output_section_statements ()
{
  lang_for_each_input_file (gld${EMULATION_NAME}_find_so);
}

/* Search the directory for a .so file for each library search.  */

static void
gld${EMULATION_NAME}_find_so (inp)
     lang_input_statement_type *inp;
{
  search_dirs_type *search;
  char *found = NULL;
  char *alc;
  struct stat st;

  if (! inp->search_dirs_flag
      || ! inp->is_archive
      || ! inp->dynamic)
    return;

  ASSERT (strncmp (inp->local_sym_name, "-l", 2) == 0);

  for (search = search_head; search != NULL; search = search->next)
    {
      boolean found_static;

      found = gld${EMULATION_NAME}_search_dir (search->name, inp->filename,
					       &found_static);
      if (found != NULL || found_static)
	break;
    }

  if (found == NULL)
    {
      /* We did not find a matching .so file.  This isn't an error,
	 since there might still be a matching .a file, which will be
	 found by the usual search.  */
      return;
    }

  /* Replace the filename with the one we have found.  */
  alc = (char *) xmalloc (strlen (search->name) + strlen (found) + 2);
  sprintf (alc, "%s/%s", search->name, found);
  inp->filename = alc;

  /* Turn off the search_dirs_flag to prevent ldfile_open_file from
     searching for this file again.  */
  inp->search_dirs_flag = false;

  free (found);

  /* Now look for the same file name, but with .sa instead of .so.  If
     found, add it to the list of input files.  */
  alc = (char *) xmalloc (strlen (inp->filename) + 1);
  strcpy (alc, inp->filename);
  strstr (alc + strlen (search->name), ".so")[2] = 'a';
  if (stat (alc, &st) != 0)
    free (alc);
  else
    {
      lang_input_statement_type *sa;

      /* Add the .sa file to the statement list just before the .so
	 file.  This is really a hack.  */
      sa = ((lang_input_statement_type *)
	    xmalloc (sizeof (lang_input_statement_type)));
      *sa = *inp;

      inp->filename = alc;
      inp->local_sym_name = alc;

      inp->header.next = (lang_statement_union_type *) sa;
      inp->next_real_file = (lang_statement_union_type *) sa;
    }
}

/* Search a directory for a .so file.  */

static char *
gld${EMULATION_NAME}_search_dir (dirname, filename, found_static)
     const char *dirname;
     const char *filename;
     boolean *found_static;
{
  int force_maj, force_min;
  const char *dot;
  unsigned int len;
  char *alc;
  char *found;
  int max_maj, max_min;
  DIR *dir;
  struct dirent *entry;
  unsigned int dirnamelen;
  char *full_path;
  int statval;
  struct stat st;

  *found_static = false;

  force_maj = -1;
  force_min = -1;
  dot = strchr (filename, '.');
  if (dot == NULL)
    {
      len = strlen (filename);
      alc = NULL;
    }
  else
    {
      force_maj = atoi (dot + 1);

      len = dot - filename;
      alc = (char *) xmalloc (len + 1);
      strncpy (alc, filename, len);
      alc[len] = '\0';
      filename = alc;

      dot = strchr (dot + 1, '.');
      if (dot != NULL)
	force_min = atoi (dot + 1);
    }

  found = NULL;
  max_maj = max_min = 0;

  dir = opendir (dirname);
  if (dir == NULL)
    return NULL;
  dirnamelen = strlen (dirname);
  
  while ((entry = readdir (dir)) != NULL)
    {
      const char *s;
      int found_maj, found_min;

      if (strncmp (entry->d_name, "lib", 3) != 0
	  || strncmp (entry->d_name + 3, filename, len) != 0)
	continue;

      if (dot == NULL
	  && strcmp (entry->d_name + 3 + len, ".a") == 0)
	{
	  *found_static = true;
	  continue;
	}

      /* We accept libfoo.so without a version number, even though the
         native linker does not.  This is more convenient for packages
         which just generate .so files for shared libraries, as on ELF
         systems.  */
      if (strncmp (entry->d_name + 3 + len, ".so", 3) != 0)
	continue;
      if (entry->d_name[6 + len] == '\0')
	;
      else if (entry->d_name[6 + len] == '.'
	       && ISDIGIT (entry->d_name[7 + len]))
	;
      else
	continue;

      for (s = entry->d_name + 6 + len; *s != '\0'; s++)
	if (*s != '.' && ! ISDIGIT (*s))
	  break;
      if (*s != '\0')
	continue;

      /* We've found a .so file.  Work out the major and minor
	 version numbers.  */
      found_maj = 0;
      found_min = 0;
      sscanf (entry->d_name + 3 + len, ".so.%d.%d",
	      &found_maj, &found_min);

      if ((force_maj != -1 && force_maj != found_maj)
	  || (force_min != -1 && force_min != found_min))
	continue;

      /* Make sure the file really exists (ignore broken symlinks).  */
      full_path = xmalloc (dirnamelen + 1 + strlen (entry->d_name) + 1);
      sprintf (full_path, "%s/%s", dirname, entry->d_name);
      statval = stat (full_path, &st);
      free (full_path);
      if (statval != 0)
	continue;

      /* We've found a match for the name we are searching for.  See
	 if this is the version we should use.  If the major and minor
	 versions match, we use the last entry in alphabetical order;
	 I don't know if this is how SunOS distinguishes libc.so.1.8
	 from libc.so.1.8.1, but it ought to suffice.  */
      if (found == NULL
	  || (found_maj > max_maj)
	  || (found_maj == max_maj
	      && (found_min > max_min
		  || (found_min == max_min
		      && strcmp (entry->d_name, found) > 0))))
	{
	  if (found != NULL)
	    free (found);
	  found = (char *) xmalloc (strlen (entry->d_name) + 1);
	  strcpy (found, entry->d_name);
	  max_maj = found_maj;
	  max_min = found_min;
	}
    }

  closedir (dir);

  if (alc != NULL)
    free (alc);

  return found;
}

/* These variables are required to pass information back and forth
   between after_open and check_needed.  */

static struct bfd_link_needed_list *global_needed;
static boolean global_found;

/* This is called after all the input files have been opened.  */

static void
gld${EMULATION_NAME}_after_open ()
{
  struct bfd_link_needed_list *needed, *l;

  /* We only need to worry about this when doing a final link.  */
  if (link_info.relocateable || link_info.shared)
    return;

  /* Get the list of files which appear in ld_need entries in dynamic
     objects included in the link.  For each such file, we want to
     track down the corresponding library, and include the symbol
     table in the link.  This is what the runtime dynamic linker will
     do.  Tracking the files down here permits one dynamic object to
     include another without requiring special action by the person
     doing the link.  Note that the needed list can actually grow
     while we are stepping through this loop.  */
  needed = bfd_sunos_get_needed_list (output_bfd, &link_info);
  for (l = needed; l != NULL; l = l->next)
    {
      struct bfd_link_needed_list *ll;
      const char *lname;
      search_dirs_type *search;

      lname = l->name;

      /* If we've already seen this file, skip it.  */
      for (ll = needed; ll != l; ll = ll->next)
	if (strcmp (ll->name, lname) == 0)
	  break;
      if (ll != l)
	continue;

      /* See if this file was included in the link explicitly.  */
      global_needed = l;
      global_found = false;
      lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
      if (global_found)
	continue;

      if (strncmp (lname, "-l", 2) != 0)
	{
	  bfd *abfd;

	  abfd = bfd_openr (lname, bfd_get_target (output_bfd));
	  if (abfd != NULL)
	    {
	      if (! bfd_check_format (abfd, bfd_object))
		{
		  (void) bfd_close (abfd);
		  abfd = NULL;
		}
	    }
	  if (abfd != NULL)
	    {
	      if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
		{
		  (void) bfd_close (abfd);
		  abfd = NULL;
		}
	    }
	  if (abfd != NULL)
	    {
	      /* We've found the needed dynamic object.  */
	      if (! bfd_link_add_symbols (abfd, &link_info))
		einfo ("%F%B: could not read symbols: %E\n", abfd);
	    }
	  else
	    {
	      einfo ("%P: warning: %s, needed by %B, not found\n",
		     lname, l->by);
	    }

	  continue;
	}

      lname += 2;

      /* We want to search for the file in the same way that the
	 dynamic linker will search.  That means that we want to use
	 rpath_link, rpath or -L, then the environment variable
	 LD_LIBRARY_PATH (native only), then (if rpath was used) the
	 linker script LIB_SEARCH_DIRS.  */
      if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
					      lname))
	continue;
      if (command_line.rpath != NULL)
	{
	  if (gld${EMULATION_NAME}_search_needed (command_line.rpath, lname))
	    continue;
	}
      else
	{
	  for (search = search_head; search != NULL; search = search->next)
	    if (gld${EMULATION_NAME}_try_needed (search->name, lname))
	      break;
	  if (search != NULL)
	    continue;
	}
EOF
if [ "x${host}" = "x${target}" ] ; then
  case " ${EMULATION_LIBPATH} " in
  *" ${EMULATION_NAME} "*)
cat >>e${EMULATION_NAME}.c <<EOF
      {
	const char *lib_path;

	lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
	if (gld${EMULATION_NAME}_search_needed (lib_path, lname))
	  continue;
      }
EOF
  ;;
  esac
fi
cat >>e${EMULATION_NAME}.c <<EOF
      if (command_line.rpath != NULL)
	{
	  for (search = search_head; search != NULL; search = search->next)
	    {
	      if (search->cmdline)
		continue;
	      if (gld${EMULATION_NAME}_try_needed (search->name, lname))
		break;
	    }
	  if (search != NULL)
	    continue;
	}

      einfo ("%P: warning: %s, needed by %B, not found\n",
	     l->name, l->by);
    }
}

/* Search for a needed file in a path.  */

static boolean
gld${EMULATION_NAME}_search_needed (path, name)
     const char *path;
     const char *name;
{
  const char *s;

  if (path == NULL || *path == '\0')
    return false;
  while (1)
    {
      const char *dir;
      char *dircopy;

      s = strchr (path, ':');
      if (s == NULL)
	{
	  dircopy = NULL;
	  dir = path;
	}
      else
	{
	  dircopy = (char *) xmalloc (s - path + 1);
	  memcpy (dircopy, path, s - path);
	  dircopy[s - path] = '\0';
	  dir = dircopy;
	}

      if (gld${EMULATION_NAME}_try_needed (dir, name))
	return true;

      if (dircopy != NULL)
	free (dircopy);

      if (s == NULL)
	break;
      path = s + 1;
    }

  return false;	  
}

/* This function is called for each possible directory for a needed
   dynamic object.  */

static boolean
gld${EMULATION_NAME}_try_needed (dir, name)
     const char *dir;
     const char *name;
{
  char *file;
  char *alc;
  boolean ignore;
  bfd *abfd;

  file = gld${EMULATION_NAME}_search_dir (dir, name, &ignore);
  if (file == NULL)
    return false;

  alc = (char *) xmalloc (strlen (dir) + strlen (file) + 2);
  sprintf (alc, "%s/%s", dir, file);
  free (file);
  abfd = bfd_openr (alc, bfd_get_target (output_bfd));
  if (abfd == NULL)
    return false;
  if (! bfd_check_format (abfd, bfd_object))
    {
      (void) bfd_close (abfd);
      return false;
    }
  if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
    {
      (void) bfd_close (abfd);
      return false;
    }

  /* We've found the needed dynamic object.  */

  /* Add this file into the symbol table.  */
  if (! bfd_link_add_symbols (abfd, &link_info))
    einfo ("%F%B: could not read symbols: %E\n", abfd);

  return true;
}

/* See if we have already included a needed object in the link.  This
   does not have to be precise, as it does no harm to include a
   dynamic object more than once.  */

static void
gld${EMULATION_NAME}_check_needed (s)
     lang_input_statement_type *s;
{
  if (s->filename == NULL)
    return;
  if (strncmp (global_needed->name, "-l", 2) != 0)
    {
      if (strcmp (s->filename, global_needed->name) == 0)
	global_found = true;
    }
  else
    {
      const char *sname, *lname;
      const char *sdot, *ldot;
      int lmaj, lmin, smaj, smin;

      lname = global_needed->name + 2;

      sname = strrchr (s->filename, '/');
      if (sname == NULL)
	sname = s->filename;
      else
	++sname;

      if (strncmp (sname, "lib", 3) != 0)
	return;
      sname += 3;

      ldot = strchr (lname, '.');
      if (ldot == NULL)
	ldot = lname + strlen (lname);

      sdot = strstr (sname, ".so.");
      if (sdot == NULL)
	return;

      if (sdot - sname != ldot - lname
	  || strncmp (lname, sname, sdot - sname) != 0)
	return;

      lmaj = lmin = -1;
      sscanf (ldot, ".%d.%d", &lmaj, &lmin);
      smaj = smin = -1;
      sscanf (sdot, ".so.%d.%d", &smaj, &smin);
      if ((smaj != lmaj && smaj != -1 && lmaj != -1)
	  || (smin != lmin && smin != -1 && lmin != -1))
	return;

      global_found = true;
    }
}

/* We need to use static variables to pass information around the call
   to lang_for_each_statement.  Ick.  */

static const char *find_assign;
static boolean found_assign;

/* We need to use static variables to pass information around the call
   to lang_for_each_input_file.  Ick.  */

static bfd_size_type need_size;
static bfd_size_type need_entries;
static bfd_byte *need_contents;
static bfd_byte *need_pinfo;
static bfd_byte *need_pnames;

/* The size of one entry in the .need section, not including the file
   name.  */

#define NEED_ENTRY_SIZE (16)

/* This is called after the sections have been attached to output
   sections, but before any sizes or addresses have been set.  */

static void
gld${EMULATION_NAME}_before_allocation ()
{
  struct bfd_link_hash_entry *hdyn = NULL;
  asection *sneed;
  asection *srules;
  asection *sdyn;

  /* The SunOS native linker creates a shared library whenever there
     are any undefined symbols in a link, unless -e is used.  This is
     pretty weird, but we are compatible.  */
  if (! link_info.shared && ! link_info.relocateable && ! entry_from_cmdline)
    {
      struct bfd_link_hash_entry *h;
      
      for (h = link_info.hash->undefs; h != NULL; h = h->next)
	{
	  if (h->type == bfd_link_hash_undefined
	      && h->u.undef.abfd != NULL
	      && (h->u.undef.abfd->flags & DYNAMIC) == 0
	      && strcmp (h->root.string, "__DYNAMIC") != 0
	      && strcmp (h->root.string, "__GLOBAL_OFFSET_TABLE_") != 0)
	    {
	      find_assign = h->root.string;
	      found_assign = false;
	      lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
	      if (! found_assign)
		{
		  link_info.shared = true;
		  break;
		}
	    }
	}
    }

  if (link_info.shared)
    {
      lang_output_section_statement_type *os;

      /* Set the .text section to start at 0x20, not 0x2020.  FIXME:
         This is too magical.  */
      os = lang_output_section_statement_lookup (".text");
      if (os->addr_tree == NULL)
	os->addr_tree = exp_intop (0x20);
    }

  /* We need to create a __DYNAMIC symbol.  We don't do this in the
     linker script because we want to set the value to the start of
     the dynamic section if there is one, or to zero if there isn't
     one.  We need to create the symbol before calling
     size_dynamic_sections, although we can't set the value until
     afterward.  */
  if (! link_info.relocateable)
    {
      hdyn = bfd_link_hash_lookup (link_info.hash, "__DYNAMIC", true, false,
				   false);
      if (hdyn == NULL)
	einfo ("%P%F: bfd_link_hash_lookup: %E\n");
      if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
					      "__DYNAMIC"))
	einfo ("%P%F: failed to record assignment to __DYNAMIC: %E\n");
    }

  /* If we are going to make any variable assignments, we need to let
     the backend linker know about them in case the variables are
     referred to by dynamic objects.  */
  lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);

  /* Let the backend linker work out the sizes of any sections
     required by dynamic linking.  */
  if (! bfd_sunos_size_dynamic_sections (output_bfd, &link_info, &sdyn,
					 &sneed, &srules))
    einfo ("%P%F: failed to set dynamic section sizes: %E\n");

  if (sneed != NULL)
    {
      /* Set up the .need section.  See the description of the ld_need
	 field in include/aout/sun4.h.  */

      need_entries = 0;
      need_size = 0;

      lang_for_each_input_file (gld${EMULATION_NAME}_count_need);

      /* We should only have a .need section if we have at least one
	 dynamic object.  */
      ASSERT (need_entries != 0);

      sneed->_raw_size = need_size;
      sneed->contents = (bfd_byte *) xmalloc (need_size);

      need_contents = sneed->contents;
      need_pinfo = sneed->contents;
      need_pnames = sneed->contents + need_entries * 16;

      lang_for_each_input_file (gld${EMULATION_NAME}_set_need);

      ASSERT ((bfd_size_type) (need_pnames - sneed->contents) == need_size);
    }

  if (srules != NULL)
    {
      /* Set up the .rules section.  This is just a PATH like string
	 of the -L arguments given on the command line.  We permit the
	 user to specify the directories using the -rpath command line
	 option.  */
      if (command_line.rpath)
	{
	  srules->_raw_size = strlen (command_line.rpath);
	  srules->contents = (bfd_byte *) command_line.rpath;
	}
      else
	{
	  unsigned int size;
	  search_dirs_type *search;

	  size = 0;
	  for (search = search_head; search != NULL; search = search->next)
	    if (search->cmdline)
	      size += strlen (search->name) + 1;
	  srules->_raw_size = size;
	  if (size > 0)
	    {
	      char *p;

	      srules->contents = (bfd_byte *) xmalloc (size);
	      p = (char *) srules->contents;
	      *p = '\0';
	      for (search = search_head; search != NULL; search = search->next)
		{
		  if (search->cmdline)
		    {
		      if (p != (char *) srules->contents)
			*p++ = ':';
		      strcpy (p, search->name);
		      p += strlen (p);
		    }
		}
	    }
	}
    }

  /* We must assign a value to __DYNAMIC.  It should be zero if we are
     not doing a dynamic link, or the start of the .dynamic section if
     we are doing one.  */
  if (! link_info.relocateable)
    {
      hdyn->type = bfd_link_hash_defined;
      hdyn->u.def.value = 0;
      if (sdyn != NULL)
	hdyn->u.def.section = sdyn;
      else
	hdyn->u.def.section = bfd_abs_section_ptr;
    }
}

/* This is called by the before_allocation routine via
   lang_for_each_statement.  It does one of two things: if the
   variable find_assign is set, it sets found_assign if it finds an
   assignment to that variable; otherwise it tells the backend linker
   about all assignment statements, in case they are assignments to
   symbols which are referred to by dynamic objects.  */

static void
gld${EMULATION_NAME}_find_assignment (s)
     lang_statement_union_type *s;
{
  if (s->header.type == lang_assignment_statement_enum
      && (find_assign == NULL || ! found_assign))
    gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
}

/* Look through an expression for an assignment statement.  */

static void
gld${EMULATION_NAME}_find_exp_assignment (exp)
     etree_type *exp;
{
  switch (exp->type.node_class)
    {
    case etree_assign:
      if (find_assign != NULL)
	{
	  if (strcmp (find_assign, exp->assign.dst) == 0)
	    found_assign = true;
	  return;
	}

      if (strcmp (exp->assign.dst, ".") != 0)
	{
	  if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
						  exp->assign.dst))
	    einfo ("%P%F: failed to record assignment to %s: %E\n",
		   exp->assign.dst);
	}
      gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
      break;

    case etree_binary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
      gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
      break;

    case etree_trinary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
      break;

    case etree_unary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
      break;

    default:
      break;
    }
}

/* Work out the size of the .need section, and the number of entries.
   The backend will set the ld_need field of the dynamic linking
   information to point to the .need section.  See include/aout/sun4.h
   for more information.  */

static void
gld${EMULATION_NAME}_count_need (inp)
     lang_input_statement_type *inp;
{
  if (inp->the_bfd != NULL
      && (inp->the_bfd->flags & DYNAMIC) != 0)
    {
      ++need_entries;
      need_size += NEED_ENTRY_SIZE;
      if (! inp->is_archive)
	need_size += strlen (inp->filename) + 1;
      else
	{
	  ASSERT (inp->local_sym_name[0] == '-'
		  && inp->local_sym_name[1] == 'l');
	  need_size += strlen (inp->local_sym_name + 2) + 1;
	}
    }
}

/* Fill in the contents of the .need section.  */

static void
gld${EMULATION_NAME}_set_need (inp)
     lang_input_statement_type *inp;
{
  if (inp->the_bfd != NULL
      && (inp->the_bfd->flags & DYNAMIC) != 0)
    {
      bfd_size_type c;

      /* To really fill in the .need section contents, we need to know
	 the final file position of the section, but we don't.
	 Instead, we use offsets, and rely on the BFD backend to
	 finish the section up correctly.  FIXME: Talk about lack of
	 referential locality.  */
      bfd_put_32 (output_bfd, need_pnames - need_contents, need_pinfo);
      if (! inp->is_archive)
	{
	  bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 4);
	  bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 8);
	  bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 10);
	  strcpy (need_pnames, inp->filename);
	}
      else
	{
	  char *verstr;
	  int maj, min;

	  bfd_put_32 (output_bfd, (bfd_vma) 0x80000000, need_pinfo + 4);
	  maj = 0;
	  min = 0;
	  verstr = strstr (inp->filename, ".so.");
	  if (verstr != NULL)
	    sscanf (verstr, ".so.%d.%d", &maj, &min);
	  bfd_put_16 (output_bfd, (bfd_vma) maj, need_pinfo + 8);
	  bfd_put_16 (output_bfd, (bfd_vma) min, need_pinfo + 10);
	  strcpy (need_pnames, inp->local_sym_name + 2);
	}

      c = (need_pinfo - need_contents) / NEED_ENTRY_SIZE;
      if (c + 1 >= need_entries)
	bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 12);
      else
	bfd_put_32 (output_bfd, (bfd_vma) (c + 1) * NEED_ENTRY_SIZE,
		    need_pinfo + 12);

      need_pinfo += NEED_ENTRY_SIZE;
      need_pnames += strlen (need_pnames) + 1;
    }
}

static char *
gld${EMULATION_NAME}_get_script(isfile)
     int *isfile;
EOF

if test -n "$COMPILE_IN"
then
# Scripts compiled in.

# sed commands to quote an ld script as a C string.
sc="-f stringify.sed"

cat >>e${EMULATION_NAME}.c <<EOF
{			     
  *isfile = 0;

  if (link_info.relocateable == true && config.build_constructors == true)
    return
EOF
sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
echo '  ; else return'                                     >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
echo '; }'                                                 >> e${EMULATION_NAME}.c

else
# Scripts read from the filesystem.

cat >>e${EMULATION_NAME}.c <<EOF
{			     
  *isfile = 1;

  if (link_info.relocateable == true && config.build_constructors == true)
    return "ldscripts/${EMULATION_NAME}.xu";
  else if (link_info.relocateable == true)
    return "ldscripts/${EMULATION_NAME}.xr";
  else if (!config.text_read_only)
    return "ldscripts/${EMULATION_NAME}.xbn";
  else if (!config.magic_demand_paged)
    return "ldscripts/${EMULATION_NAME}.xn";
  else
    return "ldscripts/${EMULATION_NAME}.x";
}
EOF

fi

cat >>e${EMULATION_NAME}.c <<EOF

struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = 
{
  gld${EMULATION_NAME}_before_parse,
  syslib_default,
  hll_default,
  after_parse_default,
  gld${EMULATION_NAME}_after_open,
  after_allocation_default,
  set_output_arch_default,
  ldemul_default_target,
  gld${EMULATION_NAME}_before_allocation,
  gld${EMULATION_NAME}_get_script,
  "${EMULATION_NAME}",
  "${OUTPUT_FORMAT}",
  NULL,	/* finish */
  gld${EMULATION_NAME}_create_output_section_statements,
  NULL,	/* open dynamic archive */
  NULL,	/* place orphan */
  gld${EMULATION_NAME}_set_symbols,
  NULL,	/* parse args */
  NULL,	/* unrecognized file */
  NULL,	/* list options */
  NULL,	/* recognized file */
  NULL,	/* find_potential_libraries */
  NULL	/* new_vers_pattern */
};
EOF