aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf32-msp430.c
blob: ac38fec494635468dd7ae43b517840aa5b34da6a (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
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
/*  MSP430-specific support for 32-bit ELF
    Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
    Contributed by Dmitry Diky <diwil@mail.ru>

    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 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.  */

#include "bfd.h"
#include "sysdep.h"
#include "libiberty.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/msp430.h"

/* Use RELA instead of REL.  */
#undef USE_REL

static reloc_howto_type elf_msp430_howto_table[] =
{
  HOWTO (R_MSP430_NONE,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_NONE",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_MSP430_32,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_32",		/* name */
	 FALSE,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 13 bit PC relative relocation.  */
  HOWTO (R_MSP430_10_PCREL,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 10,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_13_PCREL",	/* name */
	 FALSE,			/* partial_inplace */
	 0xfff,			/* src_mask */
	 0xfff,			/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A 16 bit absolute relocation.  */
  HOWTO (R_MSP430_16,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_16",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 16 bit absolute relocation for command address.  */
  HOWTO (R_MSP430_16_PCREL,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_16_PCREL",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A 16 bit absolute relocation, byte operations.  */
  HOWTO (R_MSP430_16_BYTE,	/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_16_BYTE",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 16 bit absolute relocation for command address.  */
  HOWTO (R_MSP430_16_PCREL_BYTE,/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_16_PCREL_BYTE",/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A 13 bit PC relative relocation for complicated polymorphs.  */
  HOWTO (R_MSP430_2X_PCREL,	/* type */
	 1,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 10,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_2X_PCREL",	/* name */
	 FALSE,			/* partial_inplace */
	 0xfff,			/* src_mask */
	 0xfff,			/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A 16 bit relaxable relocation for command address.  */
  HOWTO (R_MSP430_RL_PCREL,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MSP430_RL_PCREL",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffff,		/* dst_mask */
	 TRUE)			/* pcrel_offset */
};

/* Map BFD reloc types to MSP430 ELF reloc types.  */

struct msp430_reloc_map
{
  bfd_reloc_code_real_type bfd_reloc_val;
  unsigned int elf_reloc_val;
};

static const struct msp430_reloc_map msp430_reloc_map[] =
  {
    {BFD_RELOC_NONE,                 R_MSP430_NONE},
    {BFD_RELOC_32,                   R_MSP430_32},
    {BFD_RELOC_MSP430_10_PCREL,      R_MSP430_10_PCREL},
    {BFD_RELOC_16,                   R_MSP430_16_BYTE},
    {BFD_RELOC_MSP430_16_PCREL,      R_MSP430_16_PCREL},
    {BFD_RELOC_MSP430_16,            R_MSP430_16},
    {BFD_RELOC_MSP430_16_PCREL_BYTE, R_MSP430_16_PCREL_BYTE},
    {BFD_RELOC_MSP430_16_BYTE,       R_MSP430_16_BYTE},
    {BFD_RELOC_MSP430_2X_PCREL,      R_MSP430_2X_PCREL},
    {BFD_RELOC_MSP430_RL_PCREL,      R_MSP430_RL_PCREL}
  };

static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
				 bfd_reloc_code_real_type code)
{
  unsigned int i;

  for (i = 0; i < ARRAY_SIZE (msp430_reloc_map); i++)
    if (msp430_reloc_map[i].bfd_reloc_val == code)
      return &elf_msp430_howto_table[msp430_reloc_map[i].elf_reloc_val];

  return NULL;
}

/* Set the howto pointer for an MSP430 ELF reloc.  */

static void
msp430_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
			   arelent * cache_ptr,
			   Elf_Internal_Rela * dst)
{
  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);
  BFD_ASSERT (r_type < (unsigned int) R_MSP430_max);
  cache_ptr->howto = &elf_msp430_howto_table[r_type];
}

static asection *
elf32_msp430_gc_mark_hook (asection * sec,
			   struct bfd_link_info * info ATTRIBUTE_UNUSED,
			   Elf_Internal_Rela * rel,
			   struct elf_link_hash_entry * h,
			   Elf_Internal_Sym * sym)
{
  if (h != NULL)
    {
      switch (ELF32_R_TYPE (rel->r_info))
	{
	default:
	  switch (h->root.type)
	    {
	    case bfd_link_hash_defined:
	    case bfd_link_hash_defweak:
	      return h->root.u.def.section;

	    case bfd_link_hash_common:
	      return h->root.u.c.p->section;

	    default:
	      break;
	    }
	}
    }
  else
    return bfd_section_from_elf_index (sec->owner, sym->st_shndx);

  return NULL;
}

static bfd_boolean
elf32_msp430_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
			    struct bfd_link_info * info ATTRIBUTE_UNUSED,
			    asection * sec ATTRIBUTE_UNUSED,
			    const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
{
  /* We don't use got and plt entries for msp430.  */
  return TRUE;
}

/* Look through the relocs for a section during the first phase.
   Since we don't do .gots or .plts, we just need to consider the
   virtual table relocs for gc.  */

static bfd_boolean
elf32_msp430_check_relocs (bfd * abfd, struct bfd_link_info * info,
			   asection * sec, const Elf_Internal_Rela * relocs)
{
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
  const Elf_Internal_Rela *rel;
  const Elf_Internal_Rela *rel_end;

  if (info->relocatable)
    return TRUE;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  sym_hashes_end =
      sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
  if (!elf_bad_symtab (abfd))
    sym_hashes_end -= symtab_hdr->sh_info;

  rel_end = relocs + sec->reloc_count;
  for (rel = relocs; rel < rel_end; rel++)
    {
      struct elf_link_hash_entry *h;
      unsigned long r_symndx;

      r_symndx = ELF32_R_SYM (rel->r_info);
      if (r_symndx < symtab_hdr->sh_info)
	h = NULL;
      else
	h = sym_hashes[r_symndx - symtab_hdr->sh_info];
    }

  return TRUE;
}

/* Perform a single relocation.  By default we use the standard BFD
   routines, but a few relocs, we have to do them ourselves.  */

static bfd_reloc_status_type
msp430_final_link_relocate (reloc_howto_type * howto, bfd * input_bfd,
			    asection * input_section, bfd_byte * contents,
			    Elf_Internal_Rela * rel, bfd_vma relocation)
{
  bfd_reloc_status_type r = bfd_reloc_ok;
  bfd_vma x;
  bfd_signed_vma srel;

  switch (howto->type)
    {
    case R_MSP430_10_PCREL:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;
      srel -= rel->r_offset;
      srel -= 2;		/* Branch instructions add 2 to the PC...  */
      srel -= (input_section->output_section->vma +
	       input_section->output_offset);

      if (srel & 1)
	return bfd_reloc_outofrange;

      /* MSP430 addresses commands as words.  */
      srel >>= 1;

      /* Check for an overflow.  */
      if (srel < -512 || srel > 511)
	return bfd_reloc_overflow;

      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xfc00) | (srel & 0x3ff);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_MSP430_2X_PCREL:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;
      srel -= rel->r_offset;
      srel -= 2;		/* Branch instructions add 2 to the PC...  */
      srel -= (input_section->output_section->vma +
	       input_section->output_offset);

      if (srel & 1)
	return bfd_reloc_outofrange;

      /* MSP430 addresses commands as words.  */
      srel >>= 1;

      /* Check for an overflow.  */
      if (srel < -512 || srel > 511)
	return bfd_reloc_overflow;

      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xfc00) | (srel & 0x3ff);
      bfd_put_16 (input_bfd, x, contents);
      /* Handle second jump instruction.  */
      x = bfd_get_16 (input_bfd, contents - 2);
      srel += 1;
      x = (x & 0xfc00) | (srel & 0x3ff);
      bfd_put_16 (input_bfd, x, contents - 2);
      break;

    case R_MSP430_16_PCREL:
    case R_MSP430_RL_PCREL:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;
      srel -= rel->r_offset;
      /* Only branch instructions add 2 to the PC...  */
      srel -= (input_section->output_section->vma +
	       input_section->output_offset);

      if (srel & 1)
	return bfd_reloc_outofrange;

      bfd_put_16 (input_bfd, srel & 0xffff, contents);
      break;

    case R_MSP430_16_PCREL_BYTE:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;
      srel -= rel->r_offset;
      /* Only branch instructions add 2 to the PC...  */
      srel -= (input_section->output_section->vma +
	       input_section->output_offset);

      bfd_put_16 (input_bfd, srel & 0xffff, contents);
      break;

    case R_MSP430_16_BYTE:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;
      bfd_put_16 (input_bfd, srel & 0xffff, contents);
      break;

    case R_MSP430_16:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;

      if (srel & 1)
	return bfd_reloc_notsupported;

      bfd_put_16 (input_bfd, srel & 0xffff, contents);
      break;

    default:
      r = _bfd_final_link_relocate (howto, input_bfd, input_section,
				    contents, rel->r_offset,
				    relocation, rel->r_addend);
    }

  return r;
}

/* Relocate an MSP430 ELF section.  */

static bfd_boolean
elf32_msp430_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
			       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)
{
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  Elf_Internal_Rela *rel;
  Elf_Internal_Rela *relend;

  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);
  relend = relocs + input_section->reloc_count;

  for (rel = relocs; rel < relend; rel++)
    {
      reloc_howto_type *howto;
      unsigned long r_symndx;
      Elf_Internal_Sym *sym;
      asection *sec;
      struct elf_link_hash_entry *h;
      bfd_vma relocation;
      bfd_reloc_status_type r;
      const char *name = NULL;
      int r_type;

      /* This is a final link.  */

      r_type = ELF32_R_TYPE (rel->r_info);
      r_symndx = ELF32_R_SYM (rel->r_info);
      howto = elf_msp430_howto_table + ELF32_R_TYPE (rel->r_info);
      h = NULL;
      sym = NULL;
      sec = NULL;

      if (r_symndx < symtab_hdr->sh_info)
	{
	  sym = local_syms + r_symndx;
	  sec = local_sections[r_symndx];
	  relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);

	  name = bfd_elf_string_from_elf_section
	      (input_bfd, symtab_hdr->sh_link, sym->st_name);
	  name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
	}
      else
	{
	  bfd_boolean unresolved_reloc, warned;

	  RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
				   r_symndx, symtab_hdr, sym_hashes,
				   h, sec, relocation,
				   unresolved_reloc, warned);
	}

      r = msp430_final_link_relocate (howto, input_bfd, input_section,
				      contents, rel, relocation);

      if (r != bfd_reloc_ok)
	{
	  const char *msg = (const char *) NULL;

	  switch (r)
	    {
	    case bfd_reloc_overflow:
	      r = info->callbacks->reloc_overflow
		  (info, (h ? &h->root : NULL), name, howto->name,
		   (bfd_vma) 0, input_bfd, input_section,
		   rel->r_offset);
	      break;

	    case bfd_reloc_undefined:
	      r = info->callbacks->undefined_symbol
		  (info, name, input_bfd, input_section, rel->r_offset, TRUE);
	      break;

	    case bfd_reloc_outofrange:
	      msg = _("internal error: out of range error");
	      break;

	    case bfd_reloc_notsupported:
	      msg = _("internal error: unsupported relocation error");
	      break;

	    case bfd_reloc_dangerous:
	      msg = _("internal error: dangerous relocation");
	      break;

	    default:
	      msg = _("internal error: unknown error");
	      break;
	    }

	  if (msg)
	    r = info->callbacks->warning
		(info, msg, name, input_bfd, input_section, rel->r_offset);

	  if (!r)
	    return FALSE;
	}

    }

  return TRUE;
}

/* The final processing done just before writing out a MSP430 ELF object
   file.  This gets the MSP430 architecture right based on the machine
   number.  */

static void
bfd_elf_msp430_final_write_processing (bfd * abfd,
				       bfd_boolean linker ATTRIBUTE_UNUSED)
{
  unsigned long val;

  switch (bfd_get_mach (abfd))
    {
    default:
    case bfd_mach_msp110:
      val = E_MSP430_MACH_MSP430x11x1;
      break;

    case bfd_mach_msp11:
      val = E_MSP430_MACH_MSP430x11;
      break;

    case bfd_mach_msp12:
      val = E_MSP430_MACH_MSP430x12;
      break;

    case bfd_mach_msp13:
      val = E_MSP430_MACH_MSP430x13;
      break;

    case bfd_mach_msp14:
      val = E_MSP430_MACH_MSP430x14;
      break;

    case bfd_mach_msp15:
      val = E_MSP430_MACH_MSP430x15;
      break;

    case bfd_mach_msp16:
      val = E_MSP430_MACH_MSP430x16;
      break;

    case bfd_mach_msp31:
      val = E_MSP430_MACH_MSP430x31;
      break;

    case bfd_mach_msp32:
      val = E_MSP430_MACH_MSP430x32;
      break;

    case bfd_mach_msp33:
      val = E_MSP430_MACH_MSP430x33;
      break;

    case bfd_mach_msp41:
      val = E_MSP430_MACH_MSP430x41;
      break;

    case bfd_mach_msp42:
      val = E_MSP430_MACH_MSP430x42;
      break;

    case bfd_mach_msp43:
      val = E_MSP430_MACH_MSP430x43;
      break;

    case bfd_mach_msp44:
      val = E_MSP430_MACH_MSP430x44;
      break;
    }

  elf_elfheader (abfd)->e_machine = EM_MSP430;
  elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH;
  elf_elfheader (abfd)->e_flags |= val;
}

/* Set the right machine number.  */

static bfd_boolean
elf32_msp430_object_p (bfd * abfd)
{
  int e_set = bfd_mach_msp14;

  if (elf_elfheader (abfd)->e_machine == EM_MSP430
      || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD)
    {
      int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH;

      switch (e_mach)
	{
	default:
	case E_MSP430_MACH_MSP430x11:
	  e_set = bfd_mach_msp11;
	  break;

	case E_MSP430_MACH_MSP430x11x1:
	  e_set = bfd_mach_msp110;
	  break;

	case E_MSP430_MACH_MSP430x12:
	  e_set = bfd_mach_msp12;
	  break;

	case E_MSP430_MACH_MSP430x13:
	  e_set = bfd_mach_msp13;
	  break;

	case E_MSP430_MACH_MSP430x14:
	  e_set = bfd_mach_msp14;
	  break;

	case E_MSP430_MACH_MSP430x15:
	  e_set = bfd_mach_msp15;
	  break;

	case E_MSP430_MACH_MSP430x16:
	  e_set = bfd_mach_msp16;
	  break;

	case E_MSP430_MACH_MSP430x31:
	  e_set = bfd_mach_msp31;
	  break;

	case E_MSP430_MACH_MSP430x32:
	  e_set = bfd_mach_msp32;
	  break;

	case E_MSP430_MACH_MSP430x33:
	  e_set = bfd_mach_msp33;
	  break;

	case E_MSP430_MACH_MSP430x41:
	  e_set = bfd_mach_msp41;
	  break;

	case E_MSP430_MACH_MSP430x42:
	  e_set = bfd_mach_msp42;
	  break;

	case E_MSP430_MACH_MSP430x43:
	  e_set = bfd_mach_msp43;
	  break;

	case E_MSP430_MACH_MSP430x44:
	  e_set = bfd_mach_msp44;
	  break;
	}
    }

  return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set);
}

static void
elf32_msp430_post_process_headers (bfd * abfd,
				   struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
{
  Elf_Internal_Ehdr * i_ehdrp;	/* ELF file header, internal form.  */

  i_ehdrp = elf_elfheader (abfd);

#ifndef ELFOSABI_STANDALONE
#define ELFOSABI_STANDALONE	255
#endif

  i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_STANDALONE;
}

/* These functions handle relaxing for the msp430.
   Relaxation required only in two cases:
    - Bad hand coding like jumps from one section to another or
      from file to file.
    - Sibling calls. This will affect onlu 'jump label' polymorph. Without
      relaxing this enlarges code by 2 bytes. Sibcalls implemented but
      do not work in gcc's port by the reason I do not know.
   Anyway, if a relaxation required, user should pass -relax option to the
   linker.

   There are quite a few relaxing opportunities available on the msp430:

   ================================================================

   1. 3 words -> 1 word

   eq      ==      jeq label    		jne +4; br lab
   ne      !=      jne label    		jeq +4; br lab
   lt      <       jl  label    		jge +4; br lab
   ltu     <       jlo label    		lhs +4; br lab
   ge      >=      jge label    		jl  +4; br lab
   geu     >=      jhs label    		jlo +4; br lab

   2. 4 words -> 1 word

   ltn     <       jn                      jn  +2; jmp +4; br lab

   3. 4 words -> 2 words

   gt      >       jeq +2; jge label       jeq +6; jl  +4; br label
   gtu     >       jeq +2; jhs label       jeq +6; jlo +4; br label

   4. 4 words -> 2 words and 2 labels

   leu     <=      jeq label; jlo label    jeq +2; jhs +4; br label
   le      <=      jeq label; jl  label    jeq +2; jge +4; br label
   =================================================================

   codemap for first cases is (labels masked ):
	      eq:	0x2002,0x4010,0x0000 -> 0x2400
	      ne:	0x2402,0x4010,0x0000 -> 0x2000
	      lt:	0x3402,0x4010,0x0000 -> 0x3800
	      ltu:	0x2c02,0x4010,0x0000 -> 0x2800
	      ge:	0x3802,0x4010,0x0000 -> 0x3400
	      geu:	0x2802,0x4010,0x0000 -> 0x2c00

  second case:
	      ltn:	0x3001,0x3c02,0x4010,0x0000 -> 0x3000

  third case:
	      gt:	0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
	      gtu:	0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00

  fourth case:
	      leu:	0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
	      le:	0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800

  Unspecified case :)
	      jump:	0x4010,0x0000 -> 0x3c00.  */

#define NUMB_RELAX_CODES	12
static struct rcodes_s
{
  int f0, f1;			/* From code.  */
  int t0, t1;			/* To code.  */
  int labels;			/* Position of labels: 1 - one label at first
				   word, 2 - one at second word, 3 - two
				   labels at both.  */
  int cdx;			/* Words to match.  */
  int bs;			/* Shrink bytes.  */
  int off;			/* Offset from old label for new code.  */
  int ncl;			/* New code length.  */
} rcode[] =
{/*                               lab,cdx,bs,off,ncl */
  { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2,	 2},	/* jump */
  { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4,	 2},	/* eq */
  { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4,	 2},	/* ne */
  { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4,	 2},	/* lt */
  { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4,	 2},	/* ltu */
  { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4,	 2},	/* ge */
  { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4,	 2},	/* geu */
  { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6,	 2},	/* ltn */
  { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6,	 4},	/* gt */
  { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6,	 4},	/* gtu */
  { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6,	 4},	/* leu , 2 labels */
  { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6,	 4},	/* le  , 2 labels */
  { 0, 	    0, 	    0, 	    0, 	    0, 0, 0, 0,  0}
};

/* Return TRUE if a symbol exists at the given address.  */

static bfd_boolean
msp430_elf_symbol_address_p (bfd * abfd,
			     asection * sec,
			     Elf_Internal_Sym * isym,
			     bfd_vma addr)
{
  Elf_Internal_Shdr *symtab_hdr;
  unsigned int sec_shndx;
  Elf_Internal_Sym *isymend;
  struct elf_link_hash_entry **sym_hashes;
  struct elf_link_hash_entry **end_hashes;
  unsigned int symcount;

  sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);

  /* Examine all the local symbols.  */
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
    if (isym->st_shndx == sec_shndx && isym->st_value == addr)
      return TRUE;

  symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
	      - symtab_hdr->sh_info);
  sym_hashes = elf_sym_hashes (abfd);
  end_hashes = sym_hashes + symcount;
  for (; sym_hashes < end_hashes; sym_hashes++)
    {
      struct elf_link_hash_entry *sym_hash = *sym_hashes;

      if ((sym_hash->root.type == bfd_link_hash_defined
	   || sym_hash->root.type == bfd_link_hash_defweak)
	  && sym_hash->root.u.def.section == sec
	  && sym_hash->root.u.def.value == addr)
	return TRUE;
    }

  return FALSE;
}

/* Delete some bytes from a section while relaxing.  */

static bfd_boolean
msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr,
			       int count)
{
  Elf_Internal_Shdr *symtab_hdr;
  unsigned int sec_shndx;
  bfd_byte *contents;
  Elf_Internal_Rela *irel;
  Elf_Internal_Rela *irelend;
  Elf_Internal_Rela *irelalign;
  bfd_vma toaddr;
  Elf_Internal_Sym *isym;
  Elf_Internal_Sym *isymend;
  struct elf_link_hash_entry **sym_hashes;
  struct elf_link_hash_entry **end_hashes;
  unsigned int symcount;

  sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);

  contents = elf_section_data (sec)->this_hdr.contents;

  /* The deletion must stop at the next ALIGN reloc for an aligment
     power larger than the number of bytes we are deleting.  */

  irelalign = NULL;
  toaddr = sec->size;

  irel = elf_section_data (sec)->relocs;
  irelend = irel + sec->reloc_count;

  /* Actually delete the bytes.  */
  memmove (contents + addr, contents + addr + count,
	   (size_t) (toaddr - addr - count));
  sec->size -= count;

  /* Adjust all the relocs.  */
  for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
    /* Get the new reloc address.  */
    if ((irel->r_offset > addr && irel->r_offset < toaddr))
      irel->r_offset -= count;

  /* Adjust the local symbols defined in this section.  */
  symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
  isym = (Elf_Internal_Sym *) symtab_hdr->contents;
  for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
    if (isym->st_shndx == sec_shndx
	&& isym->st_value > addr && isym->st_value < toaddr)
      isym->st_value -= count;

  /* Now adjust the global symbols defined in this section.  */
  symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
	      - symtab_hdr->sh_info);
  sym_hashes = elf_sym_hashes (abfd);
  end_hashes = sym_hashes + symcount;
  for (; sym_hashes < end_hashes; sym_hashes++)
    {
      struct elf_link_hash_entry *sym_hash = *sym_hashes;

      if ((sym_hash->root.type == bfd_link_hash_defined
	   || sym_hash->root.type == bfd_link_hash_defweak)
	  && sym_hash->root.u.def.section == sec
	  && sym_hash->root.u.def.value > addr
	  && sym_hash->root.u.def.value < toaddr)
	sym_hash->root.u.def.value -= count;
    }

  return TRUE;
}


static bfd_boolean
msp430_elf_relax_section (bfd * abfd, asection * sec,
			  struct bfd_link_info * link_info,
			  bfd_boolean * again)
{
  Elf_Internal_Shdr * symtab_hdr;
  Elf_Internal_Rela * internal_relocs;
  Elf_Internal_Rela * irel;
  Elf_Internal_Rela * irelend;
  bfd_byte *          contents = NULL;
  Elf_Internal_Sym *  isymbuf = NULL;

  /* Assume nothing changes.  */
  *again = FALSE;

  /* We don't have to do anything for a relocatable link, if
     this section does not have relocs, or if this is not a
     code section.  */
  if (link_info->relocatable
      || (sec->flags & SEC_RELOC) == 0
      || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
    return TRUE;

  symtab_hdr = & elf_tdata (abfd)->symtab_hdr;

  /* Get a copy of the native relocations.  */
  internal_relocs =
    _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
  if (internal_relocs == NULL)
    goto error_return;

  /* Walk through them looking for relaxing opportunities.  */
  irelend = internal_relocs + sec->reloc_count;
  for (irel = internal_relocs; irel < irelend; irel++)
    {
      bfd_vma symval;

      /* If this isn't something that can be relaxed, then ignore
         this reloc.  */
      if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL)
	continue;

      /* Get the section contents if we haven't done so already.  */
      if (contents == NULL)
	{
	  /* Get cached copy if it exists.  */
	  if (elf_section_data (sec)->this_hdr.contents != NULL)
	    contents = elf_section_data (sec)->this_hdr.contents;
	  else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
	    goto error_return;
	}

      /* Read this BFD's local symbols if we haven't done so already.  */
      if (isymbuf == NULL && symtab_hdr->sh_info != 0)
	{
	  isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
	  if (isymbuf == NULL)
	    isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
					    symtab_hdr->sh_info, 0,
					    NULL, NULL, NULL);
	  if (isymbuf == NULL)
	    goto error_return;
	}

      /* Get the value of the symbol referred to by the reloc.  */
      if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
	{
	  /* A local symbol.  */
	  Elf_Internal_Sym *isym;
	  asection *sym_sec;

	  isym = isymbuf + ELF32_R_SYM (irel->r_info);
	  if (isym->st_shndx == SHN_UNDEF)
	    sym_sec = bfd_und_section_ptr;
	  else if (isym->st_shndx == SHN_ABS)
	    sym_sec = bfd_abs_section_ptr;
	  else if (isym->st_shndx == SHN_COMMON)
	    sym_sec = bfd_com_section_ptr;
	  else
	    sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
	  symval = (isym->st_value
		    + sym_sec->output_section->vma + sym_sec->output_offset);
	}
      else
	{
	  unsigned long indx;
	  struct elf_link_hash_entry *h;

	  /* An external symbol.  */
	  indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
	  h = elf_sym_hashes (abfd)[indx];
	  BFD_ASSERT (h != NULL);

	  if (h->root.type != bfd_link_hash_defined
	      && h->root.type != bfd_link_hash_defweak)
	    /* This appears to be a reference to an undefined
	       symbol.  Just ignore it--it will be caught by the
	       regular reloc processing.  */
	    continue;

	  symval = (h->root.u.def.value
		    + h->root.u.def.section->output_section->vma
		    + h->root.u.def.section->output_offset);
	}

      /* For simplicity of coding, we are going to modify the section
         contents, the section relocs, and the BFD symbol table.  We
         must tell the rest of the code not to free up this
         information.  It would be possible to instead create a table
         of changes which have to be made, as is done in coff-mips.c;
         that would be more work, but would require less memory when
         the linker is run.  */

      /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
         branch.  */
      /* Paranoia? paranoia...  */      
      if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL)
	{
	  bfd_vma value = symval;

	  /* Deal with pc-relative gunk.  */
	  value -= (sec->output_section->vma + sec->output_offset);
	  value -= irel->r_offset;
	  value += irel->r_addend;

	  /* See if the value will fit in 10 bits, note the high value is
	     1016 as the target will be two bytes closer if we are
	     able to relax. */
	  if ((long) value < 1016 && (long) value > -1016)
	    {
	      int code0 = 0, code1 = 0, code2 = 0;
	      int i;
	      struct rcodes_s *rx;

	      /* Get the opcode.  */
	      if (irel->r_offset >= 6)
		code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6);

	      if (irel->r_offset >= 4)
		code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4);

	      code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2);

	      if (code2 != 0x4010)
		continue;

	      /* Check r4 and r3.  */
	      for (i = NUMB_RELAX_CODES - 1; i >= 0; i--)
		{
		  rx = &rcode[i];
		  if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1)
		    break;
		  else if (rx->cdx == 1 && rx->f1 == code1)
		    break;
		  else if (rx->cdx == 0)	/* This is an unconditional jump.  */
		    break;
		}

	      /* Check labels:
		   .Label0:       ; we do not care about this label
		      jeq    +6
		   .Label1:       ; make sure there is no label here
		      jl     +4
		   .Label2:       ; make sure there is no label here
		      br .Label_dst

	         So, if there is .Label1 or .Label2 we cannot relax this code.
	         This actually should not happen, cause for relaxable
		 instructions we use RL_PCREL reloc instead of 16_PCREL.
		 Will change this in the future. */

	      if (rx->cdx > 0
		  && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
						  irel->r_offset - 2))
		continue;
	      if (rx->cdx > 1
		  && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
						  irel->r_offset - 4))
		continue;

	      /* Note that we've changed the relocs, section contents, etc.  */
	      elf_section_data (sec)->relocs = internal_relocs;
	      elf_section_data (sec)->this_hdr.contents = contents;
	      symtab_hdr->contents = (unsigned char *) isymbuf;

	      /* Fix the relocation's type.  */
	      if (rx->labels == 3)	/* Handle special cases.  */
		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					   R_MSP430_2X_PCREL);
	      else
		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					   R_MSP430_10_PCREL);

	      /* Fix the opcode right way.  */
	      bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off);
	      if (rx->t1)
		bfd_put_16 (abfd, rx->t1,
			    contents + irel->r_offset - rx->off + 2);

	      /* Delete bytes. */
	      if (!msp430_elf_relax_delete_bytes (abfd, sec,
						  irel->r_offset - rx->off +
						  rx->ncl, rx->bs))
		goto error_return;

	      /* Handle unconditional jumps.  */
	      if (rx->cdx == 0)
		irel->r_offset -= 2;

	      /* That will change things, so, we should relax again.
	         Note that this is not required, and it may be slow.  */
	      *again = TRUE;
	    }
	}
    }

  if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
    {
      if (!link_info->keep_memory)
	free (isymbuf);
      else
	{
	  /* Cache the symbols for elf_link_input_bfd.  */
	  symtab_hdr->contents = (unsigned char *) isymbuf;
	}
    }

  if (contents != NULL
      && elf_section_data (sec)->this_hdr.contents != contents)
    {
      if (!link_info->keep_memory)
	free (contents);
      else
	{
	  /* Cache the section contents for elf_link_input_bfd.  */
	  elf_section_data (sec)->this_hdr.contents = contents;
	}
    }

  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);

  return TRUE;

error_return:
  if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
    free (isymbuf);
  if (contents != NULL
      && elf_section_data (sec)->this_hdr.contents != contents)
    free (contents);
  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);

  return FALSE;
}


#define ELF_ARCH		bfd_arch_msp430
#define ELF_MACHINE_CODE	EM_MSP430
#define ELF_MACHINE_ALT1	EM_MSP430_OLD
#define ELF_MAXPAGESIZE		1

#define TARGET_LITTLE_SYM       bfd_elf32_msp430_vec
#define TARGET_LITTLE_NAME	"elf32-msp430"

#define elf_info_to_howto	             msp430_info_to_howto_rela
#define elf_info_to_howto_rel	             NULL
#define elf_backend_relocate_section         elf32_msp430_relocate_section
#define elf_backend_gc_mark_hook             elf32_msp430_gc_mark_hook
#define elf_backend_gc_sweep_hook            elf32_msp430_gc_sweep_hook
#define elf_backend_check_relocs             elf32_msp430_check_relocs
#define elf_backend_can_gc_sections          1
#define elf_backend_final_write_processing   bfd_elf_msp430_final_write_processing
#define elf_backend_object_p		     elf32_msp430_object_p
#define elf_backend_post_process_headers     elf32_msp430_post_process_headers
#define bfd_elf32_bfd_relax_section	     msp430_elf_relax_section

#include "elf32-target.h"