aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf32-avr.c
blob: 9b0e8b53bfa750e1e3e336c6382d4858f4b40e91 (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
/* AVR-specific support for 32-bit ELF
   Copyright 1999, 2000, 2001, 2002, 2003, 2004
   Free Software Foundation, Inc.
   Contributed by Denis Chertykov <denisc@overta.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 "libbfd.h"
#include "elf-bfd.h"
#include "elf/avr.h"

static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void avr_info_to_howto_rela
  PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
static asection *elf32_avr_gc_mark_hook
  PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
	   struct elf_link_hash_entry *, Elf_Internal_Sym *));
static bfd_boolean elf32_avr_gc_sweep_hook
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
	   const Elf_Internal_Rela *));
static bfd_boolean elf32_avr_check_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
	   const Elf_Internal_Rela *));
static bfd_reloc_status_type avr_final_link_relocate
  PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
	   Elf_Internal_Rela *, bfd_vma));
static bfd_boolean elf32_avr_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
	   Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static void bfd_elf_avr_final_write_processing PARAMS ((bfd *, bfd_boolean));
static bfd_boolean elf32_avr_object_p PARAMS ((bfd *));

static reloc_howto_type elf_avr_howto_table[] =
{
  HOWTO (R_AVR_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_AVR_NONE",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_AVR_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_AVR_32",		/* name */
	 FALSE,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 7 bit PC relative relocation.  */
  HOWTO (R_AVR_7_PCREL,		/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 7,			/* bitsize */
	 TRUE,			/* pc_relative */
	 3,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc, /* special_function */
	 "R_AVR_7_PCREL",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A 13 bit PC relative relocation.  */
  HOWTO (R_AVR_13_PCREL,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 13,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc, /* special_function */
	 "R_AVR_13_PCREL",	/* name */
	 FALSE,			/* partial_inplace */
	 0xfff,			/* src_mask */
	 0xfff,			/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A 16 bit absolute relocation.  */
  HOWTO (R_AVR_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_AVR_16",		/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 16 bit absolute relocation for command address.  */
  HOWTO (R_AVR_16_PM,		/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_16_PM",		/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A low 8 bit absolute relocation of 16 bit address.
     For LDI command.  */
  HOWTO (R_AVR_LO8_LDI,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_LO8_LDI",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A high 8 bit absolute relocation of 16 bit address.
     For LDI command.  */
  HOWTO (R_AVR_HI8_LDI,		/* type */
	 8,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HI8_LDI",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A high 6 bit absolute relocation of 22 bit address.
     For LDI command.  */
  HOWTO (R_AVR_HH8_LDI,		/* type */
	 16,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HH8_LDI",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A negative low 8 bit absolute relocation of 16 bit address.
     For LDI command.  */
  HOWTO (R_AVR_LO8_LDI_NEG,	/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_LO8_LDI_NEG",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A hegative high 8 bit absolute relocation of 16 bit address.
     For LDI command.  */
  HOWTO (R_AVR_HI8_LDI_NEG,	/* type */
	 8,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HI8_LDI_NEG",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A hegative high 6 bit absolute relocation of 22 bit address.
     For LDI command.  */
  HOWTO (R_AVR_HH8_LDI_NEG,	/* type */
	 16,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HH8_LDI_NEG",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A low 8 bit absolute relocation of 24 bit program memory address.
     For LDI command.  */
  HOWTO (R_AVR_LO8_LDI_PM,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_LO8_LDI_PM",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A high 8 bit absolute relocation of 16 bit program memory address.
     For LDI command.  */
  HOWTO (R_AVR_HI8_LDI_PM,	/* type */
	 9,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HI8_LDI_PM",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A high 8 bit absolute relocation of 24 bit program memory address.
     For LDI command.  */
  HOWTO (R_AVR_HH8_LDI_PM,	/* type */
	 17,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HH8_LDI_PM",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A low 8 bit absolute relocation of a negative 24 bit
     program memory address.  For LDI command.  */
  HOWTO (R_AVR_LO8_LDI_PM_NEG,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_LO8_LDI_PM_NEG", /* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A high 8 bit absolute relocation of a negative 16 bit
     program memory address.  For LDI command.  */
  HOWTO (R_AVR_HI8_LDI_PM_NEG,	/* type */
	 9,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HI8_LDI_PM_NEG", /* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A high 8 bit absolute relocation of a negative 24 bit
     program memory address.  For LDI command.  */
  HOWTO (R_AVR_HH8_LDI_PM_NEG,	/* type */
	 17,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_HH8_LDI_PM_NEG", /* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* Relocation for CALL command in ATmega.  */
  HOWTO (R_AVR_CALL,		/* type */
	 1,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 23,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_CALL",		/* name */
	 FALSE,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),			/* pcrel_offset */
  /* A 16 bit absolute relocation of 16 bit address.
     For LDI command.  */
  HOWTO (R_AVR_LDI,		/* 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_AVR_LDI",		/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A 6 bit absolute relocation of 6 bit offset.
     For ldd/sdd command.  */
  HOWTO (R_AVR_6,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 6,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_6",		/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
  /* A 6 bit absolute relocation of 6 bit offset.
     For sbiw/adiw command.  */
  HOWTO (R_AVR_6_ADIW,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 6,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_AVR_6_ADIW",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE)			/* pcrel_offset */
};

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

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

 static const struct avr_reloc_map avr_reloc_map[] =
{
  { BFD_RELOC_NONE,                 R_AVR_NONE },
  { BFD_RELOC_32,                   R_AVR_32 },
  { BFD_RELOC_AVR_7_PCREL,          R_AVR_7_PCREL },
  { BFD_RELOC_AVR_13_PCREL,         R_AVR_13_PCREL },
  { BFD_RELOC_16,                   R_AVR_16 },
  { BFD_RELOC_AVR_16_PM,            R_AVR_16_PM },
  { BFD_RELOC_AVR_LO8_LDI,          R_AVR_LO8_LDI},
  { BFD_RELOC_AVR_HI8_LDI,          R_AVR_HI8_LDI },
  { BFD_RELOC_AVR_HH8_LDI,          R_AVR_HH8_LDI },
  { BFD_RELOC_AVR_LO8_LDI_NEG,      R_AVR_LO8_LDI_NEG },
  { BFD_RELOC_AVR_HI8_LDI_NEG,      R_AVR_HI8_LDI_NEG },
  { BFD_RELOC_AVR_HH8_LDI_NEG,      R_AVR_HH8_LDI_NEG },
  { BFD_RELOC_AVR_LO8_LDI_PM,       R_AVR_LO8_LDI_PM },
  { BFD_RELOC_AVR_HI8_LDI_PM,       R_AVR_HI8_LDI_PM },
  { BFD_RELOC_AVR_HH8_LDI_PM,       R_AVR_HH8_LDI_PM },
  { BFD_RELOC_AVR_LO8_LDI_PM_NEG,   R_AVR_LO8_LDI_PM_NEG },
  { BFD_RELOC_AVR_HI8_LDI_PM_NEG,   R_AVR_HI8_LDI_PM_NEG },
  { BFD_RELOC_AVR_HH8_LDI_PM_NEG,   R_AVR_HH8_LDI_PM_NEG },
  { BFD_RELOC_AVR_CALL,             R_AVR_CALL },
  { BFD_RELOC_AVR_LDI,              R_AVR_LDI  },
  { BFD_RELOC_AVR_6,                R_AVR_6    },
  { BFD_RELOC_AVR_6_ADIW,           R_AVR_6_ADIW }
};

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

  for (i = 0;
       i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map);
       i++)
    {
      if (avr_reloc_map[i].bfd_reloc_val == code)
	return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val];
    }

  return NULL;
}

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

static void
avr_info_to_howto_rela (abfd, cache_ptr, dst)
     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_AVR_max);
  cache_ptr->howto = &elf_avr_howto_table[r_type];
}

static asection *
elf32_avr_gc_mark_hook (sec, info, rel, h, sym)
     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_avr_gc_sweep_hook (abfd, info, sec, relocs)
     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 avr.  */
  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_avr_check_relocs (abfd, info, sec, 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
avr_final_link_relocate (howto, input_bfd, input_section,
			 contents, rel, relocation)
     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_AVR_7_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;
      if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
	return bfd_reloc_overflow;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_13_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;

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

      /* Check for overflow.  */
      if (srel < -2048 || srel > 2047)
	{
	  /* Apply WRAPAROUND if possible.  */
	  switch (bfd_get_mach (input_bfd))
	    {
	    case bfd_mach_avr2:
	    case bfd_mach_avr4:
	      break;

	    default:
	      return bfd_reloc_overflow;
	    }
	}

      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf000) | (srel & 0xfff);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if ((srel & 0xffff) > 255)
	/* Remove offset for data/eeprom section.  */
	return bfd_reloc_overflow;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_6:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (((srel & 0xffff) > 63) || (srel < 0))
	/* Remove offset for data/eeprom section.  */
	return bfd_reloc_overflow;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7) | ((srel & (1 << 5)) << 8));
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_6_ADIW:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (((srel & 0xffff) > 63) || (srel < 0))
	/* Remove offset for data/eeprom section.  */
	return bfd_reloc_overflow;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2); 
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI_PM:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (srel & 1)
	return bfd_reloc_outofrange;
      srel = srel >> 1;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI_PM:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (srel & 1)
	return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI_PM:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (srel & 1)
	return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI_PM_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      if (srel & 1)
	return bfd_reloc_outofrange;
      srel = srel >> 1;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI_PM_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      if (srel & 1)
	return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI_PM_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      if (srel & 1)
	return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_CALL:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (srel & 1)
	return bfd_reloc_outofrange;
      srel = srel >> 1;
      x = bfd_get_16 (input_bfd, contents);
      x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
      bfd_put_16 (input_bfd, x, contents);
      bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2);
      break;

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

  return r;
}

/* Relocate an AVR ELF section.  */
static bfd_boolean
elf32_avr_relocate_section (output_bfd, info, input_bfd, input_section,
			    contents, relocs, local_syms, local_sections)
     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;

  if (info->relocatable)
    return TRUE;

  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;
      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_avr_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);

	  name = h->root.root.string;
	}

      r = avr_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 AVR ELF object
   file.  This gets the AVR architecture right based on the machine
   number.  */

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

  switch (bfd_get_mach (abfd))
    {
    default:
    case bfd_mach_avr2:
      val = E_AVR_MACH_AVR2;
      break;

    case bfd_mach_avr1:
      val = E_AVR_MACH_AVR1;
      break;

    case bfd_mach_avr3:
      val = E_AVR_MACH_AVR3;
      break;

    case bfd_mach_avr4:
      val = E_AVR_MACH_AVR4;
      break;

    case bfd_mach_avr5:
      val = E_AVR_MACH_AVR5;
      break;
    }

  elf_elfheader (abfd)->e_machine = EM_AVR;
  elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
  elf_elfheader (abfd)->e_flags |= val;
}

/* Set the right machine number.  */

static bfd_boolean
elf32_avr_object_p (abfd)
     bfd *abfd;
{
  unsigned int e_set = bfd_mach_avr2;
  if (elf_elfheader (abfd)->e_machine == EM_AVR
      || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
    {
      int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
      switch (e_mach)
	{
	default:
	case E_AVR_MACH_AVR2:
	  e_set = bfd_mach_avr2;
	  break;

	case E_AVR_MACH_AVR1:
	  e_set = bfd_mach_avr1;
	  break;

	case E_AVR_MACH_AVR3:
	  e_set = bfd_mach_avr3;
	  break;

	case E_AVR_MACH_AVR4:
	  e_set = bfd_mach_avr4;
	  break;

	case E_AVR_MACH_AVR5:
	  e_set = bfd_mach_avr5;
	  break;
	}
    }
  return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
				    e_set);
}

#define ELF_ARCH		bfd_arch_avr
#define ELF_MACHINE_CODE	EM_AVR
#define ELF_MACHINE_ALT1	EM_AVR_OLD
#define ELF_MAXPAGESIZE		1

#define TARGET_LITTLE_SYM       bfd_elf32_avr_vec
#define TARGET_LITTLE_NAME	"elf32-avr"

#define elf_info_to_howto	             avr_info_to_howto_rela
#define elf_info_to_howto_rel	             NULL
#define elf_backend_relocate_section         elf32_avr_relocate_section
#define elf_backend_gc_mark_hook             elf32_avr_gc_mark_hook
#define elf_backend_gc_sweep_hook            elf32_avr_gc_sweep_hook
#define elf_backend_check_relocs             elf32_avr_check_relocs
#define elf_backend_can_gc_sections          1
#define elf_backend_rela_normal		     1
#define elf_backend_final_write_processing \
					bfd_elf_avr_final_write_processing
#define elf_backend_object_p		elf32_avr_object_p

#include "elf32-target.h"