forked from bminor/binutils-gdb
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathelf32-crx.c
1326 lines (1143 loc) · 39.7 KB
/
elf32-crx.c
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
/* BFD back-end for National Semiconductor's CRX ELF
Copyright (C) 2004-2025 Free Software Foundation, Inc.
Written by Tomer Levi, NSC, Israel.
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 "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/crx.h"
static reloc_howto_type *elf_crx_reloc_type_lookup
(bfd *, bfd_reloc_code_real_type);
static bool elf_crx_info_to_howto
(bfd *, arelent *, Elf_Internal_Rela *);
static bool elf32_crx_relax_delete_bytes
(struct bfd_link_info *, bfd *, asection *, bfd_vma, int);
static bfd_reloc_status_type crx_elf_final_link_relocate
(reloc_howto_type *, bfd *, bfd *, asection *,
bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
struct bfd_link_info *, asection *, int);
static int elf32_crx_relocate_section
(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
static bool elf32_crx_relax_section
(bfd *, asection *, struct bfd_link_info *, bool *);
static bfd_byte * elf32_crx_get_relocated_section_contents
(bfd *, struct bfd_link_info *, struct bfd_link_order *,
bfd_byte *, bool, asymbol **);
/* crx_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */
struct crx_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */
unsigned short crx_reloc_type; /* CRX relocation type. */
};
static const struct crx_reloc_map crx_reloc_map[R_CRX_MAX] =
{
{BFD_RELOC_NONE, R_CRX_NONE},
{BFD_RELOC_CRX_REL4, R_CRX_REL4},
{BFD_RELOC_CRX_REL8, R_CRX_REL8},
{BFD_RELOC_CRX_REL8_CMP, R_CRX_REL8_CMP},
{BFD_RELOC_CRX_REL16, R_CRX_REL16},
{BFD_RELOC_CRX_REL24, R_CRX_REL24},
{BFD_RELOC_CRX_REL32, R_CRX_REL32},
{BFD_RELOC_CRX_REGREL12, R_CRX_REGREL12},
{BFD_RELOC_CRX_REGREL22, R_CRX_REGREL22},
{BFD_RELOC_CRX_REGREL28, R_CRX_REGREL28},
{BFD_RELOC_CRX_REGREL32, R_CRX_REGREL32},
{BFD_RELOC_CRX_ABS16, R_CRX_ABS16},
{BFD_RELOC_CRX_ABS32, R_CRX_ABS32},
{BFD_RELOC_CRX_NUM8, R_CRX_NUM8},
{BFD_RELOC_CRX_NUM16, R_CRX_NUM16},
{BFD_RELOC_CRX_NUM32, R_CRX_NUM32},
{BFD_RELOC_CRX_IMM16, R_CRX_IMM16},
{BFD_RELOC_CRX_IMM32, R_CRX_IMM32},
{BFD_RELOC_CRX_SWITCH8, R_CRX_SWITCH8},
{BFD_RELOC_CRX_SWITCH16, R_CRX_SWITCH16},
{BFD_RELOC_CRX_SWITCH32, R_CRX_SWITCH32}
};
static reloc_howto_type crx_elf_howto_table[] =
{
HOWTO (R_CRX_NONE, /* type */
0, /* rightshift */
0, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL4, /* type */
1, /* rightshift */
1, /* size */
4, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL4", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xf, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL8, /* type */
1, /* rightshift */
1, /* size */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL8", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL8_CMP, /* type */
1, /* rightshift */
1, /* size */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL8_CMP", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL16, /* type */
1, /* rightshift */
2, /* size */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL24, /* type */
1, /* rightshift */
4, /* size */
24, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL24", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL32, /* type */
1, /* rightshift */
4, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL12, /* type */
0, /* rightshift */
2, /* size */
12, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL12", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xfff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL22, /* type */
0, /* rightshift */
4, /* size */
22, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL22", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0x3fffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL28, /* type */
0, /* rightshift */
4, /* size */
28, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL28", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xfffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_ABS16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_ABS16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_ABS32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_ABS32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_NUM8, /* type */
0, /* rightshift */
1, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NUM8", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_NUM16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NUM16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_NUM32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NUM32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_IMM16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_IMM16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_IMM32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_IMM32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* An 8 bit switch table entry. This is generated for an expression
such as ``.byte L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_CRX_SWITCH8, /* type */
0, /* rightshift */
1, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_SWITCH8", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* A 16 bit switch table entry. This is generated for an expression
such as ``.word L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_CRX_SWITCH16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_SWITCH16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* A 32 bit switch table entry. This is generated for an expression
such as ``.long L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_CRX_SWITCH32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_SWITCH32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
true) /* pcrel_offset */
};
/* Retrieve a howto ptr using a BFD reloc_code. */
static reloc_howto_type *
elf_crx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < R_CRX_MAX; i++)
if (code == crx_reloc_map[i].bfd_reloc_enum)
return &crx_elf_howto_table[crx_reloc_map[i].crx_reloc_type];
printf ("This relocation Type is not supported -0x%x\n", code);
return 0;
}
static reloc_howto_type *
elf_crx_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (crx_elf_howto_table) / sizeof (crx_elf_howto_table[0]);
i++)
if (crx_elf_howto_table[i].name != NULL
&& strcasecmp (crx_elf_howto_table[i].name, r_name) == 0)
return &crx_elf_howto_table[i];
return NULL;
}
/* Retrieve a howto ptr using an internal relocation entry. */
static bool
elf_crx_info_to_howto (bfd *abfd, arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type = ELF32_R_TYPE (dst->r_info);
if (r_type >= R_CRX_MAX)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return false;
}
cache_ptr->howto = &crx_elf_howto_table[r_type];
return true;
}
/* Perform a relocation as part of a final link. */
static bfd_reloc_status_type
crx_elf_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd,
bfd *output_bfd ATTRIBUTE_UNUSED,
asection *input_section, bfd_byte *contents,
bfd_vma offset, bfd_vma Rvalue, bfd_vma addend,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
asection *sec ATTRIBUTE_UNUSED,
int is_local ATTRIBUTE_UNUSED)
{
unsigned short r_type = howto->type;
bfd_byte *hit_data = contents + offset;
bfd_vma reloc_bits, check;
switch (r_type)
{
case R_CRX_IMM16:
case R_CRX_IMM32:
case R_CRX_ABS16:
case R_CRX_ABS32:
case R_CRX_REL8_CMP:
case R_CRX_REL16:
case R_CRX_REL24:
case R_CRX_REL32:
case R_CRX_REGREL12:
case R_CRX_REGREL22:
case R_CRX_REGREL28:
case R_CRX_REGREL32:
/* 'hit_data' is relative to the start of the instruction, not the
relocation offset. Advance it to account for the exact offset. */
hit_data += 2;
break;
case R_CRX_REL4:
/* This relocation type is used only in 'Branch if Equal to 0'
instructions and requires special handling. */
Rvalue -= 1;
break;
case R_CRX_NONE:
return bfd_reloc_ok;
break;
case R_CRX_SWITCH8:
case R_CRX_SWITCH16:
case R_CRX_SWITCH32:
/* We only care about the addend, where the difference between
expressions is kept. */
Rvalue = 0;
default:
break;
}
if (howto->pc_relative)
{
/* Subtract the address of the section containing the location. */
Rvalue -= (input_section->output_section->vma
+ input_section->output_offset);
/* Subtract the position of the location within the section. */
Rvalue -= offset;
}
/* Add in supplied addend. */
Rvalue += addend;
/* Complain if the bitfield overflows, whether it is considered
as signed or unsigned. */
check = Rvalue >> howto->rightshift;
reloc_bits = ((bfd_vma) 1 << (howto->bitsize - 1) << 1) - 1;
if ((check & ~reloc_bits) != 0
&& (check & ~reloc_bits) != ((bfd_vma) -1 & ~reloc_bits))
{
/* The above right shift is incorrect for a signed
value. See if turning on the upper bits fixes the
overflow. */
if (howto->rightshift && (bfd_signed_vma) Rvalue < 0)
{
check |= (bfd_vma) -1 & ~((bfd_vma) -1 >> howto->rightshift);
if ((check & ~reloc_bits) != ((bfd_vma) -1 & ~reloc_bits))
return bfd_reloc_overflow;
}
else
return bfd_reloc_overflow;
}
/* Drop unwanted bits from the value we are relocating to. */
Rvalue >>= howto->rightshift;
/* Apply dst_mask to select only relocatable part of the insn. */
Rvalue &= howto->dst_mask;
switch (bfd_get_reloc_size (howto))
{
case 1:
if (r_type == R_CRX_REL4)
{
Rvalue <<= 4;
Rvalue |= (bfd_get_8 (input_bfd, hit_data) & 0x0f);
}
bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data);
break;
case 2:
if (r_type == R_CRX_REGREL12)
Rvalue |= (bfd_get_16 (input_bfd, hit_data) & 0xf000);
bfd_put_16 (input_bfd, Rvalue, hit_data);
break;
case 4:
if (r_type == R_CRX_REL24
|| r_type == R_CRX_REGREL22
|| r_type == R_CRX_REGREL28)
Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16) |
bfd_get_16 (input_bfd, hit_data + 2)) & ~howto->dst_mask);
if (r_type == R_CRX_NUM32 || r_type == R_CRX_SWITCH32)
/* Relocation on DATA is purely little-endian, that is, for a
multi-byte datum, the lowest address in memory contains the
little end of the datum, that is, the least significant byte.
Therefore we use BFD's byte Putting functions. */
bfd_put_32 (input_bfd, Rvalue, hit_data);
else
/* Relocation on INSTRUCTIONS is different : Instructions are
word-addressable, that is, each word itself is arranged according
to little-endian convention, whereas the words are arranged with
respect to one another in BIG ENDIAN fashion.
When there is an immediate value that spans a word boundary, it is
split in a big-endian way with respect to the words. */
{
bfd_put_16 (input_bfd, (Rvalue >> 16) & 0xffff, hit_data);
bfd_put_16 (input_bfd, Rvalue & 0xffff, hit_data + 2);
}
break;
default:
return bfd_reloc_notsupported;
}
return bfd_reloc_ok;
}
/* Delete some bytes from a section while relaxing. */
static bool
elf32_crx_relax_delete_bytes (struct bfd_link_info *link_info, 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, *irelend;
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;
struct elf_link_hash_entry **start_hashes;
unsigned int symcount;
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
contents = elf_section_data (sec)->this_hdr.contents;
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)
{
/* Adjust the addend of SWITCH relocations in this section,
which reference this local symbol. */
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
{
unsigned long r_symndx;
Elf_Internal_Sym *rsym;
bfd_vma addsym, subsym;
/* Skip if not a SWITCH relocation. */
if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH8
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH16
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH32)
continue;
r_symndx = ELF32_R_SYM (irel->r_info);
rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx;
/* Skip if not the local adjusted symbol. */
if (rsym != isym)
continue;
addsym = isym->st_value;
subsym = addsym - irel->r_addend;
/* Fix the addend only when -->> (addsym > addr >= subsym). */
if (subsym <= addr)
irel->r_addend -= count;
else
continue;
}
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 = start_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;
/* The '--wrap SYMBOL' option is causing a pain when the object file,
containing the definition of __wrap_SYMBOL, includes a direct
call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
the same symbol (which is __wrap_SYMBOL), but still exist as two
different symbols in 'sym_hashes', we don't want to adjust
the global symbol __wrap_SYMBOL twice.
This check is only relevant when symbols are being wrapped. */
if (link_info->wrap_hash != NULL)
{
struct elf_link_hash_entry **cur_sym_hashes;
/* Loop only over the symbols whom been already checked. */
for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
cur_sym_hashes++)
{
/* If the current symbol is identical to 'sym_hash', that means
the symbol was already adjusted (or at least checked). */
if (*cur_sym_hashes == sym_hash)
break;
}
/* Don't adjust the symbol again. */
if (cur_sym_hashes < sym_hashes)
continue;
}
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;
}
/* This is a version of bfd_generic_get_relocated_section_contents
which uses elf32_crx_relocate_section. */
static bfd_byte *
elf32_crx_get_relocated_section_contents (bfd *output_bfd,
struct bfd_link_info *link_info,
struct bfd_link_order *link_order,
bfd_byte *data,
bool relocatable,
asymbol **symbols)
{
Elf_Internal_Shdr *symtab_hdr;
asection *input_section = link_order->u.indirect.section;
bfd *input_bfd = input_section->owner;
asection **sections = NULL;
Elf_Internal_Rela *internal_relocs = NULL;
Elf_Internal_Sym *isymbuf = NULL;
/* We only need to handle the case of relaxing, or of having a
particular set of section contents, specially. */
if (relocatable
|| elf_section_data (input_section)->this_hdr.contents == NULL)
return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
link_order, data,
relocatable,
symbols);
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
bfd_byte *orig_data = data;
if (data == NULL)
{
data = bfd_malloc (input_section->size);
if (data == NULL)
return NULL;
}
memcpy (data, elf_section_data (input_section)->this_hdr.contents,
(size_t) input_section->size);
if ((input_section->flags & SEC_RELOC) != 0
&& input_section->reloc_count > 0)
{
Elf_Internal_Sym *isym;
Elf_Internal_Sym *isymend;
asection **secpp;
bfd_size_type amt;
internal_relocs = (_bfd_elf_link_read_relocs
(input_bfd, input_section, NULL,
(Elf_Internal_Rela *) NULL, false));
if (internal_relocs == NULL)
goto error_return;
if (symtab_hdr->sh_info != 0)
{
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
if (isymbuf == NULL)
isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
symtab_hdr->sh_info, 0,
NULL, NULL, NULL);
if (isymbuf == NULL)
goto error_return;
}
amt = symtab_hdr->sh_info;
amt *= sizeof (asection *);
sections = bfd_malloc (amt);
if (sections == NULL && amt != 0)
goto error_return;
isymend = isymbuf + symtab_hdr->sh_info;
for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
{
asection *isec;
if (isym->st_shndx == SHN_UNDEF)
isec = bfd_und_section_ptr;
else if (isym->st_shndx == SHN_ABS)
isec = bfd_abs_section_ptr;
else if (isym->st_shndx == SHN_COMMON)
isec = bfd_com_section_ptr;
else
isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
*secpp = isec;
}
if (! elf32_crx_relocate_section (output_bfd, link_info, input_bfd,
input_section, data, internal_relocs,
isymbuf, sections))
goto error_return;
free (sections);
if (symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (elf_section_data (input_section)->relocs != internal_relocs)
free (internal_relocs);
}
return data;
error_return:
free (sections);
if (symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (elf_section_data (input_section)->relocs != internal_relocs)
free (internal_relocs);
if (orig_data == NULL)
free (data);
return NULL;
}
/* Relocate a CRX ELF section. */
static int
elf32_crx_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 = crx_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
{
bool 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 (bfd_link_relocatable (info))
continue;
r = crx_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 (sec);
}
switch (r)
{
case bfd_reloc_overflow:
(*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:
(*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");
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:
(*info->callbacks->warning) (info, msg, name, input_bfd,
input_section, rel->r_offset);
break;
}
}
}
return true;
}
/* This function handles relaxing for the CRX.
There's quite a few relaxing opportunites available on the CRX:
* bal/bcond:32 -> bal/bcond:16 2 bytes
* bcond:16 -> bcond:8 2 bytes
* cmpbcond:24 -> cmpbcond:8 2 bytes
* arithmetic imm32 -> arithmetic imm16 2 bytes
Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
static bool
elf32_crx_relax_section (bfd *abfd, asection *sec,
struct bfd_link_info *link_info, bool *again)
{
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *irel, *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 (bfd_link_relocatable (link_info)
|| sec->reloc_count == 0
|| (sec->flags & SEC_RELOC) == 0
|| (sec->flags & SEC_HAS_CONTENTS) == 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, (Elf_Internal_Rela *) 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_CRX_REL32
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL16