aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf32-cr16c.c
blob: d8333e191cbf5c0b030ec90a029986367d63a295 (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
/* BFD back-end for National Semiconductor's CR16C ELF
   Copyright (C) 2004-2014 Free Software Foundation, Inc.

   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.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "bfdlink.h"
#include "elf/cr16c.h"
#include "elf-bfd.h"


#define USE_REL	1	/* CR16C uses REL relocations instead of RELA.  */

/* The following definition is based on EMPTY_HOWTO macro,
   but also initiates the "name" field in HOWTO struct.  */
#define ONLY_NAME_HOWTO(C) \
  HOWTO ((C), 0, 0, 0, FALSE, 0, complain_overflow_dont, NULL, \
	  STRINGX(C), FALSE, 0, 0, FALSE)

/* reloc_map_index array maps CRASM relocation type into a BFD
   relocation enum. The array's indices are synchronized with
   RINDEX_16C_* indices, created in include/elf/cr16c.h.
   The array is used in:
   1. elf32-cr16c.c : elf_cr16c_reloc_type_lookup().
   2. asreloc.c : find_reloc_type(). */

RELOC_MAP reloc_map_index[RINDEX_16C_MAX] =
{
  {R_16C_NUM08,     BFD_RELOC_16C_NUM08},
  {R_16C_NUM08_C,   BFD_RELOC_16C_NUM08_C},
  {R_16C_NUM16,     BFD_RELOC_16C_NUM16},
  {R_16C_NUM16_C,   BFD_RELOC_16C_NUM16_C},
  {R_16C_NUM32,     BFD_RELOC_16C_NUM32},
  {R_16C_NUM32_C,   BFD_RELOC_16C_NUM32_C},
  {R_16C_DISP04,    BFD_RELOC_16C_DISP04},
  {R_16C_DISP04_C,  BFD_RELOC_16C_DISP04_C},
  {R_16C_DISP08,    BFD_RELOC_16C_DISP08},
  {R_16C_DISP08_C,  BFD_RELOC_16C_DISP08_C},
  {R_16C_DISP16,    BFD_RELOC_16C_DISP16},
  {R_16C_DISP16_C,  BFD_RELOC_16C_DISP16_C},
  {R_16C_DISP24,    BFD_RELOC_16C_DISP24},
  {R_16C_DISP24_C,  BFD_RELOC_16C_DISP24_C},
  {R_16C_DISP24a,   BFD_RELOC_16C_DISP24a},
  {R_16C_DISP24a_C, BFD_RELOC_16C_DISP24a_C},
  {R_16C_REG04,     BFD_RELOC_16C_REG04},
  {R_16C_REG04_C,   BFD_RELOC_16C_REG04_C},
  {R_16C_REG04a,    BFD_RELOC_16C_REG04a},
  {R_16C_REG04a_C,  BFD_RELOC_16C_REG04a_C},
  {R_16C_REG14,     BFD_RELOC_16C_REG14},
  {R_16C_REG14_C,   BFD_RELOC_16C_REG14_C},
  {R_16C_REG16,     BFD_RELOC_16C_REG16},
  {R_16C_REG16_C,   BFD_RELOC_16C_REG16_C},
  {R_16C_REG20,     BFD_RELOC_16C_REG20},
  {R_16C_REG20_C,   BFD_RELOC_16C_REG20_C},
  {R_16C_ABS20,     BFD_RELOC_16C_ABS20},
  {R_16C_ABS20_C,   BFD_RELOC_16C_ABS20_C},
  {R_16C_ABS24,     BFD_RELOC_16C_ABS24},
  {R_16C_ABS24_C,   BFD_RELOC_16C_ABS24_C},
  {R_16C_IMM04,     BFD_RELOC_16C_IMM04},
  {R_16C_IMM04_C,   BFD_RELOC_16C_IMM04_C},
  {R_16C_IMM16,     BFD_RELOC_16C_IMM16},
  {R_16C_IMM16_C,   BFD_RELOC_16C_IMM16_C},
  {R_16C_IMM20,     BFD_RELOC_16C_IMM20},
  {R_16C_IMM20_C,   BFD_RELOC_16C_IMM20_C},
  {R_16C_IMM24,     BFD_RELOC_16C_IMM24},
  {R_16C_IMM24_C,   BFD_RELOC_16C_IMM24_C},
  {R_16C_IMM32,     BFD_RELOC_16C_IMM32},
  {R_16C_IMM32_C,   BFD_RELOC_16C_IMM32_C}
};

static reloc_howto_type elf_howto_table[] =
{
  /* 00 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM08),
  /* 01 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM08_C),
  /* 02 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM16),
  /* 03 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM16_C),
  /* 04 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM32),
  /* 05 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM32_C),
  /* 06 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP04),
  /* 07 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP04_C),
  /* 08 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP08),
  /* 09 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP08_C),
  /* 10 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP16),
  /* 11 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP16_C),
  /* 12 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24),
  /* 13 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24_C),
  /* 14 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24a),
  /* 15 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24a_C),
  /* 16 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04),
  /* 17 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04_C),
  /* 18 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04a),
  /* 19 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04a_C),
  /* 20 */ ONLY_NAME_HOWTO (RINDEX_16C_REG14),
  /* 21 */ ONLY_NAME_HOWTO (RINDEX_16C_REG14_C),
  /* 22 */ ONLY_NAME_HOWTO (RINDEX_16C_REG16),
  /* 23 */ ONLY_NAME_HOWTO (RINDEX_16C_REG16_C),
  /* 24 */ ONLY_NAME_HOWTO (RINDEX_16C_REG20),
  /* 25 */ ONLY_NAME_HOWTO (RINDEX_16C_REG20_C),
  /* 26 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS20),
  /* 27 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS20_C),
  /* 28 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS24),
  /* 29 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS24_C),
  /* 30 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM04),
  /* 31 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM04_C),
  /* 32 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM16),
  /* 33 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM16_C),
  /* 34 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM20),
  /* 35 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM20_C),
  /* 36 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM24),
  /* 37 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM24_C),
  /* 38 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM32),
  /* 39 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM32_C)
};


/* Code to turn a code_type into a howto ptr, uses the above howto table.  */

static reloc_howto_type *
elf_cr16c_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			     bfd_reloc_code_real_type code)
{
  unsigned int i;

  for (i = 0; i < RINDEX_16C_MAX; i++)
    {
      if (code == reloc_map_index[i].bfd_reloc_enum)
	{
	  /* printf ("CR16C Relocation Type is - %x\n", code); */
	  return & elf_howto_table[i];
	}
    }

  /* printf ("This relocation Type is not supported - %x\n", code); */
  return 0;
}

static reloc_howto_type *
elf_cr16c_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			     const char *r_name)
{
  unsigned int i;

  for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
    if (elf_howto_table[i].name != NULL
	&& strcasecmp (elf_howto_table[i].name, r_name) == 0)
      return &elf_howto_table[i];

  return NULL;
}

static void
elf_cr16c_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
			 arelent *cache_ptr ATTRIBUTE_UNUSED,
			 Elf_Internal_Rela *dst ATTRIBUTE_UNUSED)
{
  abort ();
}

static void
elf_cr16c_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
			     arelent *cache_ptr,
			     Elf_Internal_Rela *dst)
{
  unsigned int r_type = ELF32_R_TYPE (dst->r_info);

  if (r_type >= RINDEX_16C_MAX)
    {
      _bfd_error_handler (_("%A; invalid CR16C reloc number: %d"), abfd, r_type);
      r_type = 0;
    }
  cache_ptr->howto = &elf_howto_table[r_type];
}

/* Perform a relocation as part of a final link.  */

static bfd_reloc_status_type
cr16c_elf_final_link_relocate (reloc_howto_type *howto,
			       bfd *abfd,
			       bfd *output_bfd ATTRIBUTE_UNUSED,
			       asection *input_section,
			       bfd_byte *data,
			       bfd_vma octets,
			       bfd_vma Rvalue,
			       bfd_vma addend ATTRIBUTE_UNUSED,
			       struct bfd_link_info *info ATTRIBUTE_UNUSED,
			       asection *sym_sec ATTRIBUTE_UNUSED,
			       int is_local ATTRIBUTE_UNUSED)
{
  long value;
  short sword;			/* Extracted from the hole and put back.  */
  unsigned long format, addr_type, code_factor;
  unsigned short size;
  unsigned short r_type;

  unsigned long disp20_opcod;
  char neg = 0;
  char neg2pos = 0;

  long left_val = 0;
  long plus_factor = 0;		/* To be added to the hole.  */

#define MIN_BYTE	((int) 0xFFFFFF80)
#define MIN_WORD	((int) 0xFFFF8000)
#define	MAX_UWORD	((unsigned) 0x0000FFFF)
#define	MAX_UBYTE	((unsigned) 0x000000FF)

  r_type = reloc_map_index[howto->type].cr_reloc_type;
  format = r_type & R_FORMAT;
  size = r_type & R_SIZESP;
  addr_type = r_type & R_ADDRTYPE;
  code_factor = ((addr_type == R_CODE_ADDR) ? 1 : 0);

  switch (format)
    {
    case R_NUMBER:
      switch (size)
	{
	case R_S_16C_08: 	/* One byte.  */
	  value = bfd_get_8 (abfd, (char *) data + octets);
	  break;
	case R_S_16C_16: 	/* Two bytes. */
	  sword = bfd_get_16 (abfd, (bfd_byte *) data + octets);
	  value = sword;
	  break;
	case R_S_16C_32:	/* Four bytes.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  break;
	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_DISPL:
      switch (size)
	{
	case R_S_16C_04:    /* word1(4-7).  */
	  value = bfd_get_8 (abfd, (char *) data + octets);
	  left_val = value & 0xF;
	  value = (value & 0xF0) >> 4;
	  value++;
	  value <<= 1;
	  break;
	case R_S_16C_08:    /* word1(0-3,8-11).  */
	  sword = bfd_get_16 (abfd, (char *) data + octets);
	  value = sword & 0x000F;
	  value |= ((sword & 0x0F00) >> 4);
	  left_val = sword & 0xF0F0;
	  value <<= 1;
	  if (value & 0x100)
	    value |= 0xFFFFFF00;
	  break;
	case R_S_16C_16:    /* word2.  */
	  sword = bfd_get_16 (abfd, (bfd_byte *) data + octets);
	  value = sword;
	  value = ((value & 0xFFFE) >> 1) | ((value & 0x1) << 15);
	  value <<= 1;
	  if (value & 0x10000)
	    value |= 0xFFFF0000;
	  break;
	case R_S_16C_24_a:	/* word1(0-7),word2.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  left_val = value & 0x0000FF00;
	  value = ((value & 0xFFFE0000) >> 17) |
	    ((value & 0x00010000) << 7) | ((value & 0x000000FF) << 15);
	  value <<= 1;
	  if (value & 0x1000000)
	    value |= 0xFE000000;
	  break;
	case R_S_16C_24:    /* word2(0-3,8-11),word3.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  left_val = value & 0x0000F0F0;
	  value = ((value >> 16) & 0x0000FFFF) |
	    ((value & 0x00000F00) << 8) | ((value & 0x0000000F) << 20);

	  value = ((value & 0x00FFFFFE) >> 1) | ((value & 0x00000001) << 23);

	  value <<= 1;
	  if (value & 0x1000000)
	    value |= 0xFE000000;
	  break;
	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_REGREL:
      switch (size)
	{
	case R_S_16C_04:    /* word1(12-15) not scaled.  */
	  value = bfd_get_8 (abfd, (char *) data + octets);
	  left_val = value & 0xF0;
	  value = value & 0xF;
	  break;
	case R_S_16C_04_a:	/* word1(12-15) scaled by 2.  */
	  value = bfd_get_8 (abfd, (char *) data + octets);
	  left_val = value & 0xF0;
	  value = value & 0xF;
	  value <<= 1;
	  break;
	case R_S_16C_14:    /* word1(4-5),word2(0-3,8-15).  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  left_val = value & 0x00F0FFCF;
	  value = ((value & 0xc0000000) >> 24) |
	    ((value & 0x3F000000) >> 16) |
	    ((value & 0x000F0000) >> 16) | (value & 0x00000030);
	  break;
	case R_S_16C_16:    /* word2.  */
	  sword = bfd_get_16 (abfd, (bfd_byte *) data + octets);
	  value = sword;
	  break;
	case R_S_16C_20:    /* word2(8-11),word3.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  left_val = value & 0xF0;
	  value = (value & 0xF) << 16;
	  sword = bfd_get_16 (abfd, (bfd_byte *) data + octets + 1);
	  value = value | (unsigned short) sword;
	  disp20_opcod = bfd_get_32 (abfd, (bfd_byte *) data + octets - 3);
	  disp20_opcod |= 0x0FFF0000;
	  if ((disp20_opcod == 0x4FFF0018) ||	/* loadb -disp20(reg) */
	      (disp20_opcod == 0x5FFF0018) ||	/* loadb -disp20(rp)  */
	      (disp20_opcod == 0x8FFF0018) ||	/* loadd -disp20(reg) */
	      (disp20_opcod == 0x9FFF0018) ||	/* loadd -disp20(rp)  */
	      (disp20_opcod == 0xCFFF0018) ||	/* loadw -disp20(reg) */
	      (disp20_opcod == 0xDFFF0018) ||	/* loadw -disp20(rp)  */
	      (disp20_opcod == 0x4FFF0019) ||	/* storb -disp20(reg) */
	      (disp20_opcod == 0x5FFF0019) ||	/* storb -disp20(rp)  */
	      (disp20_opcod == 0x8FFF0019) ||	/* stord -disp20(reg) */
	      (disp20_opcod == 0x9FFF0019) ||	/* stord -disp20(rp)  */
	      (disp20_opcod == 0xCFFF0019) ||	/* storw -disp20(reg) */
	      (disp20_opcod == 0xDFFF0019))
	    {	/* storw -disp20(rp).  */
	      neg = 1;
	      value |= 0xFFF00000;
	    }

	  break;
	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_ABS:
      switch (size)
	{
	case R_S_16C_20:    /* word1(0-3),word2.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  left_val = value & 0x0000FFF0;
	  value = ((value & 0xFFFF0000) >> 16) |
	    ((value & 0x0000000F) << 16);
	  break;
	case R_S_16C_24:   /* word2(0-3,8-11),word3.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  left_val = value & 0x0000F0F0;
	  value = ((value & 0xFFFF0000) >> 16) |
	    ((value & 0x00000F00) << 8) | ((value & 0x0000000F) << 20);
	  break;
	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_IMMED:
      switch (size)
	{
	case R_S_16C_04:    /* word1/2(4-7).  */
	  value = bfd_get_8 (abfd, (char *) data + octets);
	  left_val = value & 0xF;
	  value = (value & 0xF0) >> 4;
	  break;
	case R_S_16C_16:    /* word2.  */
	  sword = bfd_get_16 (abfd, (bfd_byte *) data + octets);
	  value = sword;
	  break;
	case R_S_16C_20:    /* word1(0-3),word2.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  left_val = value & 0x0000FFF0;
	  value = ((value & 0xFFFF0000) >> 16) |
	    ((value & 0x0000000F) << 16);
	  break;
	case R_S_16C_32:    /* word2, word3.  */
	  value = bfd_get_32 (abfd, (bfd_byte *) data + octets);
	  value = ((value & 0x0000FFFF) << 16) |
	    ((value & 0xFFFF0000) >> 16);
	  break;
	default:
	  return bfd_reloc_notsupported;
	}
      break;
    default:
      return bfd_reloc_notsupported;
    }

  switch ((r_type & R_RELTO) >> 4)
    {

    case 0:	/* R_ABS.  */
      plus_factor = Rvalue;
      break;
    case 1:	/* R_PCREL.  */
      plus_factor = Rvalue -
	(input_section->output_section->vma + input_section->output_offset);
      break;
    default:
      return bfd_reloc_notsupported;
    }

  if (neg)
    {
      if (plus_factor >= -value)
	neg2pos = 1;
      /* We need to change load/stor with negative
	 displ opcode to positive disp opcode (CR16C).  */
    }

  value = value + (plus_factor >> code_factor);

  switch (format)
    {
    case R_NUMBER:
      switch (size)
	{
	case R_S_16C_08: 	/* One byte.  */
	  if (value > (int) MAX_UBYTE || value < MIN_BYTE)
	    return bfd_reloc_overflow;
	  value &= 0xFF;
	  bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets);
	  break;

	case R_S_16C_16:	/* Two bytes.  */
	  if (value > (int) MAX_UWORD || value < MIN_WORD)
	    return bfd_reloc_overflow;
	  value &= 0xFFFF;
	  sword = value;
	  bfd_put_16 (abfd, (bfd_vma) sword,
		      (unsigned char *) data + octets);
	  break;

	case R_S_16C_32:	/* Four bytes.  */
	  value &= 0xFFFFFFFF;
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_DISPL:
      switch (size)
	{
	case R_S_16C_04:	/* word1(4-7).  */
	  if ((value - 32) > 32 || value < 2)
	    return bfd_reloc_overflow;
	  value >>= 1;
	  value--;
	  value &= 0xF;
	  value <<= 4;
	  value |= left_val;
	  bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets);
	  break;

	case R_S_16C_08:    /* word1(0-3,8-11).  */
	  if (value > 255 || value < -256 || value == 0x80)
	    return bfd_reloc_overflow;
	  value &= 0x1FF;
	  value >>= 1;
	  sword = value & 0x000F;
	  sword |= (value & 0x00F0) << 4;
	  sword |= left_val;
	  bfd_put_16 (abfd, (bfd_vma) sword,
		      (unsigned char *) data + octets);
	  break;

	case R_S_16C_16:    /* word2.  */
	  if (value > 65535 || value < -65536)
	    return bfd_reloc_overflow;
	  value >>= 1;
	  value &= 0xFFFF;
	  value = ((value & 0x8000) >> 15) | ((value & 0x7FFF) << 1);
	  sword = value;
	  bfd_put_16 (abfd, (bfd_vma) sword,
		      (unsigned char *) data + octets);
	  break;

	case R_S_16C_24_a:	/* word1(0-7),word2.  */
	  if (value > 16777215 || value < -16777216)
	    return bfd_reloc_overflow;
	  value &= 0x1FFFFFF;
	  value >>= 1;
	  value = ((value & 0x00007FFF) << 17) |
	    ((value & 0x00800000) >> 7) | ((value & 0x007F8000) >> 15);
	  value |= left_val;
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	case R_S_16C_24:    /* word2(0-3,8-11),word3.  */
	  if (value > 16777215 || value < -16777216)
	    return bfd_reloc_overflow;
	  value &= 0x1FFFFFF;
	  value >>= 1;

	  value = ((value & 0x007FFFFF) << 1) | ((value & 0x00800000) >> 23);

	  value = ((value & 0x0000FFFF) << 16) |
	    ((value & 0x000F0000) >> 8) | ((value & 0x00F00000) >> 20);
	  value |= left_val;
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_REGREL:
      switch (size)
	{
	case R_S_16C_04:	/* word1(12-15) not scaled.  */
	  if (value > 13 || value < 0)
	    return bfd_reloc_overflow;
	  value &= 0xF;
	  value |= left_val;
	  bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets);
	  break;

	case R_S_16C_04_a:	/* word1(12-15) not scaled.  */
	  if (value > 26 || value < 0)
	    return bfd_reloc_overflow;
	  value &= 0x1F;
	  value >>= 1;
	  value |= left_val;
	  bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets);
	  break;

	case R_S_16C_14:	/* word1(4-5),word2(0-3,8-15).  */
	  if (value < 0 || value > 16383)
	    return bfd_reloc_overflow;
	  value &= 0x3FFF;
	  value = ((value & 0x000000c0) << 24) |
	    ((value & 0x00003F00) << 16) |
	    ((value & 0x0000000F) << 16) | (value & 0x00000030);
	  value |= left_val;
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	case R_S_16C_16:	/* word2.  */
	  if (value > 65535 || value < 0)
	    return bfd_reloc_overflow;
	  value &= 0xFFFF;
	  sword = value;
	  bfd_put_16 (abfd, (bfd_vma) sword,
		      (unsigned char *) data + octets);
	  break;

	case R_S_16C_20:	/* word2(8-11),word3.  */
	  /* if (value > 1048575 || value < 0) RELOC_ERROR(1); */
	  value &= 0xFFFFF;
	  sword = value & 0x0000FFFF;
	  value = (value & 0x000F0000) >> 16;
	  value |= left_val;
	  bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets);
	  bfd_put_16 (abfd, (bfd_vma) sword,
		      (unsigned char *) data + octets + 1);
	  if (neg2pos)
	    {
	      /* Change load/stor negative displ opcode
	         to load/stor positive displ opcode.  */
	      value = bfd_get_8 (abfd, (char *) data + octets - 3);
	      value &= 0xF7;
	      value |= 0x2;
	      bfd_put_8 (abfd, (bfd_vma) value,
			 (unsigned char *) data + octets - 3);
	    }
	  break;

	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_ABS:
      switch (size)
	{
	case R_S_16C_20:	/* word1(0-3),word2.  */
	  if (value > 1048575 || value < 0)
	    return bfd_reloc_overflow;
	  value &= 0xFFFFF;
	  value = ((value & 0x0000FFFF) << 16) |
	    ((value & 0x000F0000) >> 16);
	  value |= left_val;
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	case R_S_16C_24:	/* word2(0-3,8-11),word3.  */
	  /* if (value > 16777215 || value < 0) RELOC_ERROR(1); */
	  value &= 0xFFFFFF;
	  value = ((value & 0x0000FFFF) << 16) |
	    ((value & 0x000F0000) >> 8) | ((value & 0x00F00000) >> 20);
	  value |= left_val;
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	default:
	  return bfd_reloc_notsupported;
	}
      break;

    case R_16C_IMMED:
      switch (size)
	{
	case R_S_16C_04:	/* word1/2(4-7).  */
	  if (value > 15 || value < -1)
	    return bfd_reloc_overflow;
	  value &= 0xF;
	  value <<= 4;
	  value |= left_val;
	  bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets);
	  break;

	case R_S_16C_16:	/* word2.  */
	  if (value > 32767 || value < -32768)
	    return bfd_reloc_overflow;
	  value &= 0xFFFF;
	  sword = value;
	  bfd_put_16 (abfd, (bfd_vma) sword,
		      (unsigned char *) data + octets);
	  break;

	case R_S_16C_20:	/* word1(0-3),word2.  */
	  if (value > 1048575 || value < 0)
	    return bfd_reloc_overflow;
	  value &= 0xFFFFF;
	  value = ((value & 0x0000FFFF) << 16) |
	    ((value & 0x000F0000) >> 16);
	  value |= left_val;
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	case R_S_16C_32:	/* word2, word3.  */
	  value &= 0xFFFFFFFF;
	  value = ((value & 0x0000FFFF) << 16) |
	    ((value & 0xFFFF0000) >> 16);
	  bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets);
	  break;

	default:
	  return bfd_reloc_notsupported;
	}
      break;
    default:
      return bfd_reloc_notsupported;
    }

  return bfd_reloc_ok;
}

/* Relocate a CR16C ELF section.  */

static bfd_boolean
elf32_cr16c_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)
{
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  Elf_Internal_Rela *rel, *relend;

  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);

  rel = relocs;
  relend = relocs + input_section->reloc_count;
  for (; rel < relend; rel++)
    {
      int r_type;
      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;

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

      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);
	}
      else
	{
	  bfd_boolean unresolved_reloc, warned, ignored;

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

      if (sec != NULL && discarded_section (sec))
	RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
					 rel, 1, relend, howto, 0, contents);

      if (info->relocatable)
	{
	  /* This is a relocatable link.  We don't have to change
	     anything, unless the reloc is against a section symbol,
	     in which case we have to adjust according to where the
	     section symbol winds up in the output section.  */
	  if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
	    rel->r_addend += sec->output_offset;
	  continue;
	}

      r = cr16c_elf_final_link_relocate (howto, input_bfd, output_bfd,
					 input_section,
					 contents, rel->r_offset,
					 relocation, rel->r_addend,
					 info, sec, h == NULL);

      if (r != bfd_reloc_ok)
	{
	  const char *name;
	  const char *msg = (const char *) 0;

	  if (h != NULL)
	    name = h->root.root.string;
	  else
	    {
	      name = (bfd_elf_string_from_elf_section
		      (input_bfd, symtab_hdr->sh_link, sym->st_name));
	      if (name == NULL || *name == '\0')
		name = bfd_section_name (input_bfd, sec);
	    }

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

	    case bfd_reloc_undefined:
	      if (!((*info->callbacks->undefined_symbol)
		    (info, name, input_bfd, input_section,
		     rel->r_offset, TRUE)))
		return FALSE;
	      break;

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

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

	    case bfd_reloc_dangerous:
	      msg = _("internal error: dangerous error");
	      goto common_error;

	    default:
	      msg = _("internal error: unknown error");
	      /* fall through */

	    common_error:
	      if (!((*info->callbacks->warning)
		    (info, msg, name, input_bfd, input_section,
		     rel->r_offset)))
		return FALSE;
	      break;
	    }
	}
    }

  return TRUE;
}

/* CR16C ELF uses three common sections:
   One is for default common symbols (placed in usual common section).
   Second is for near common symbols (placed in "ncommon" section).
   Third is for far common symbols (placed in "fcommon" section).
   The following implementation is based on elf32-mips architecture */

static asection  cr16c_elf_fcom_section;
static asymbol   cr16c_elf_fcom_symbol;
static asymbol * cr16c_elf_fcom_symbol_ptr;
static asection  cr16c_elf_ncom_section;
static asymbol   cr16c_elf_ncom_symbol;
static asymbol * cr16c_elf_ncom_symbol_ptr;

/* Given a BFD section, try to locate the
   corresponding ELF section index.  */

static bfd_boolean
elf32_cr16c_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
				      asection *sec,
				      int *retval)
{
  if (strcmp (bfd_get_section_name (abfd, sec), ".fcommon") == 0)
    *retval = SHN_CR16C_FCOMMON;
  else if (strcmp (bfd_get_section_name (abfd, sec), ".ncommon") == 0)
    *retval = SHN_CR16C_NCOMMON;
  else
    return FALSE;

  return TRUE;
}

/* Handle the special CR16C section numbers that a symbol may use.  */

static void
elf32_cr16c_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
			       asymbol *asym)
{
  elf_symbol_type *elfsym = (elf_symbol_type *) asym;
  unsigned int indx;

  indx = elfsym->internal_elf_sym.st_shndx;

  switch (indx)
    {
    case SHN_CR16C_FCOMMON:
      if (cr16c_elf_fcom_section.name == NULL)
	{
	  /* Initialize the far common section.  */
	  cr16c_elf_fcom_section.name = ".fcommon";
	  cr16c_elf_fcom_section.flags = SEC_IS_COMMON | SEC_ALLOC;
	  cr16c_elf_fcom_section.output_section = &cr16c_elf_fcom_section;
	  cr16c_elf_fcom_section.symbol = &cr16c_elf_fcom_symbol;
	  cr16c_elf_fcom_section.symbol_ptr_ptr = &cr16c_elf_fcom_symbol_ptr;
	  cr16c_elf_fcom_symbol.name = ".fcommon";
	  cr16c_elf_fcom_symbol.flags = BSF_SECTION_SYM;
	  cr16c_elf_fcom_symbol.section = &cr16c_elf_fcom_section;
	  cr16c_elf_fcom_symbol_ptr = &cr16c_elf_fcom_symbol;
	}
      asym->section = &cr16c_elf_fcom_section;
      asym->value = elfsym->internal_elf_sym.st_size;
      break;
    case SHN_CR16C_NCOMMON:
      if (cr16c_elf_ncom_section.name == NULL)
	{
	  /* Initialize the far common section.  */
	  cr16c_elf_ncom_section.name = ".ncommon";
	  cr16c_elf_ncom_section.flags = SEC_IS_COMMON | SEC_ALLOC;
	  cr16c_elf_ncom_section.output_section = &cr16c_elf_ncom_section;
	  cr16c_elf_ncom_section.symbol = &cr16c_elf_ncom_symbol;
	  cr16c_elf_ncom_section.symbol_ptr_ptr = &cr16c_elf_ncom_symbol_ptr;
	  cr16c_elf_ncom_symbol.name = ".ncommon";
	  cr16c_elf_ncom_symbol.flags = BSF_SECTION_SYM;
	  cr16c_elf_ncom_symbol.section = &cr16c_elf_ncom_section;
	  cr16c_elf_ncom_symbol_ptr = &cr16c_elf_ncom_symbol;
	}
      asym->section = &cr16c_elf_ncom_section;
      asym->value = elfsym->internal_elf_sym.st_size;
      break;
    }
}

/* Hook called by the linker routine which adds symbols from an object
   file.  We must handle the special cr16c section numbers here.  */

static bfd_boolean
elf32_cr16c_add_symbol_hook (bfd *abfd,
			     struct bfd_link_info *info ATTRIBUTE_UNUSED,
			     Elf_Internal_Sym *sym,
			     const char **namep ATTRIBUTE_UNUSED,
			     flagword *flagsp ATTRIBUTE_UNUSED,
			     asection **secp,
			     bfd_vma *valp)
{
  unsigned int indx = sym->st_shndx;

  switch (indx)
    {
    case SHN_CR16C_FCOMMON:
      *secp = bfd_make_section_old_way (abfd, ".fcommon");
      (*secp)->flags |= SEC_IS_COMMON;
      *valp = sym->st_size;
      break;
    case SHN_CR16C_NCOMMON:
      *secp = bfd_make_section_old_way (abfd, ".ncommon");
      (*secp)->flags |= SEC_IS_COMMON;
      *valp = sym->st_size;
      break;
    }

  return TRUE;
}

static int
elf32_cr16c_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED,
				     const char *name ATTRIBUTE_UNUSED,
				     Elf_Internal_Sym *sym,
				     asection *input_sec,
				     struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
{
  /* If we see a common symbol, which implies a relocatable link, then
     if a symbol was in a special common section in an input file, mark
     it as a special common in the output file.  */

  if (sym->st_shndx == SHN_COMMON)
    {
      if (strcmp (input_sec->name, ".fcommon") == 0)
	sym->st_shndx = SHN_CR16C_FCOMMON;
      else if (strcmp (input_sec->name, ".ncommon") == 0)
	sym->st_shndx = SHN_CR16C_NCOMMON;
    }

  return 1;
}

/* Definitions for setting CR16C target vector.  */
#define TARGET_LITTLE_SYM		cr16c_elf32_vec
#define TARGET_LITTLE_NAME		"elf32-cr16c"
#define ELF_ARCH			bfd_arch_cr16c
#define ELF_MACHINE_CODE		EM_CR
#define ELF_MAXPAGESIZE			0x1
#define elf_symbol_leading_char		'_'

#define bfd_elf32_bfd_reloc_type_lookup		elf_cr16c_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup	elf_cr16c_reloc_name_lookup
#define elf_info_to_howto			elf_cr16c_info_to_howto
#define elf_info_to_howto_rel			elf_cr16c_info_to_howto_rel
#define elf_backend_relocate_section		elf32_cr16c_relocate_section
#define elf_backend_symbol_processing		elf32_cr16c_symbol_processing
#define elf_backend_section_from_bfd_section 	elf32_cr16c_section_from_bfd_section
#define elf_backend_add_symbol_hook		elf32_cr16c_add_symbol_hook
#define elf_backend_link_output_symbol_hook 	elf32_cr16c_link_output_symbol_hook

#define elf_backend_can_gc_sections     1

#include "elf32-target.h"