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[thirdparty/binutils-gdb.git] / bfd / elf32-nios2.c
1 /* 32-bit ELF support for Nios II.
2 Copyright (C) 2012-2024 Free Software Foundation, Inc.
3 Contributed by Nigel Gray (ngray@altera.com).
4 Contributed by Mentor Graphics, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 /* This file handles Altera Nios II ELF targets. */
24
25 #include "sysdep.h"
26 #include "bfd.h"
27 #include "libbfd.h"
28 #include "bfdlink.h"
29 #include "genlink.h"
30 #include "elf-bfd.h"
31 #include "elf/nios2.h"
32 #include "opcode/nios2.h"
33 #include "elf32-nios2.h"
34 #include "libiberty.h"
35
36 /* Use RELA relocations. */
37 #ifndef USE_RELA
38 #define USE_RELA
39 #endif
40
41 #ifdef USE_REL
42 #undef USE_REL
43 #endif
44
45 /* Forward declarations. */
46 static bfd_reloc_status_type nios2_elf32_ignore_reloc
47 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
48 static bfd_reloc_status_type nios2_elf32_hi16_relocate
49 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
50 static bfd_reloc_status_type nios2_elf32_lo16_relocate
51 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
52 static bfd_reloc_status_type nios2_elf32_hiadj16_relocate
53 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
54 static bfd_reloc_status_type nios2_elf32_pcrel_lo16_relocate
55 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
56 static bfd_reloc_status_type nios2_elf32_pcrel_hiadj16_relocate
57 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
58 static bfd_reloc_status_type nios2_elf32_pcrel16_relocate
59 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
60 static bfd_reloc_status_type nios2_elf32_call26_relocate
61 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
62 static bfd_reloc_status_type nios2_elf32_gprel_relocate
63 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
64 static bfd_reloc_status_type nios2_elf32_ujmp_relocate
65 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
66 static bfd_reloc_status_type nios2_elf32_cjmp_relocate
67 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
68 static bfd_reloc_status_type nios2_elf32_callr_relocate
69 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
70
71 /* Target vector. */
72 extern const bfd_target nios2_elf32_le_vec;
73 extern const bfd_target nios2_elf32_be_vec;
74
75 /* Offset of tp and dtp pointers from start of TLS block. */
76 #define TP_OFFSET 0x7000
77 #define DTP_OFFSET 0x8000
78
79 /* The relocation tables used for SHT_REL sections. There are separate
80 tables for R1 and R2 encodings. */
81 static reloc_howto_type elf_nios2_r1_howto_table_rel[] = {
82 /* No relocation. */
83 HOWTO (R_NIOS2_NONE, /* type */
84 0, /* rightshift */
85 0, /* size */
86 0, /* bitsize */
87 false, /* pc_relative */
88 0, /* bitpos */
89 complain_overflow_dont, /* complain_on_overflow */
90 bfd_elf_generic_reloc, /* special_function */
91 "R_NIOS2_NONE", /* name */
92 false, /* partial_inplace */
93 0, /* src_mask */
94 0, /* dst_mask */
95 false), /* pcrel_offset */
96
97 /* 16-bit signed immediate relocation. */
98 HOWTO (R_NIOS2_S16, /* type */
99 0, /* rightshift */
100 4, /* size */
101 16, /* bitsize */
102 false, /* pc_relative */
103 6, /* bitpos */
104 complain_overflow_signed, /* complain on overflow */
105 bfd_elf_generic_reloc, /* special function */
106 "R_NIOS2_S16", /* name */
107 false, /* partial_inplace */
108 0x003fffc0, /* src_mask */
109 0x003fffc0, /* dest_mask */
110 false), /* pcrel_offset */
111
112 /* 16-bit unsigned immediate relocation. */
113 HOWTO (R_NIOS2_U16, /* type */
114 0, /* rightshift */
115 4, /* size */
116 16, /* bitsize */
117 false, /* pc_relative */
118 6, /* bitpos */
119 complain_overflow_unsigned, /* complain on overflow */
120 bfd_elf_generic_reloc, /* special function */
121 "R_NIOS2_U16", /* name */
122 false, /* partial_inplace */
123 0x003fffc0, /* src_mask */
124 0x003fffc0, /* dest_mask */
125 false), /* pcrel_offset */
126
127 HOWTO (R_NIOS2_PCREL16, /* type */
128 0, /* rightshift */
129 4, /* size */
130 16, /* bitsize */
131 true, /* pc_relative */
132 6, /* bitpos */
133 complain_overflow_signed, /* complain on overflow */
134 nios2_elf32_pcrel16_relocate, /* special function */
135 "R_NIOS2_PCREL16", /* name */
136 false, /* partial_inplace */
137 0x003fffc0, /* src_mask */
138 0x003fffc0, /* dest_mask */
139 true), /* pcrel_offset */
140
141 HOWTO (R_NIOS2_CALL26, /* type */
142 2, /* rightshift */
143 4, /* size */
144 26, /* bitsize */
145 false, /* pc_relative */
146 6, /* bitpos */
147 complain_overflow_dont, /* complain on overflow */
148 nios2_elf32_call26_relocate, /* special function */
149 "R_NIOS2_CALL26", /* name */
150 false, /* partial_inplace */
151 0xffffffc0, /* src_mask */
152 0xffffffc0, /* dst_mask */
153 false), /* pcrel_offset */
154
155 HOWTO (R_NIOS2_IMM5,
156 0,
157 4,
158 5,
159 false,
160 6,
161 complain_overflow_bitfield,
162 bfd_elf_generic_reloc,
163 "R_NIOS2_IMM5",
164 false,
165 0x000007c0,
166 0x000007c0,
167 false),
168
169 HOWTO (R_NIOS2_CACHE_OPX,
170 0,
171 4,
172 5,
173 false,
174 22,
175 complain_overflow_bitfield,
176 bfd_elf_generic_reloc,
177 "R_NIOS2_CACHE_OPX",
178 false,
179 0x07c00000,
180 0x07c00000,
181 false),
182
183 HOWTO (R_NIOS2_IMM6,
184 0,
185 4,
186 6,
187 false,
188 6,
189 complain_overflow_bitfield,
190 bfd_elf_generic_reloc,
191 "R_NIOS2_IMM6",
192 false,
193 0x00000fc0,
194 0x00000fc0,
195 false),
196
197 HOWTO (R_NIOS2_IMM8,
198 0,
199 4,
200 8,
201 false,
202 6,
203 complain_overflow_bitfield,
204 bfd_elf_generic_reloc,
205 "R_NIOS2_IMM8",
206 false,
207 0x00003fc0,
208 0x00003fc0,
209 false),
210
211 HOWTO (R_NIOS2_HI16,
212 0,
213 4,
214 32,
215 false,
216 6,
217 complain_overflow_dont,
218 nios2_elf32_hi16_relocate,
219 "R_NIOS2_HI16",
220 false,
221 0x003fffc0,
222 0x003fffc0,
223 false),
224
225 HOWTO (R_NIOS2_LO16,
226 0,
227 4,
228 32,
229 false,
230 6,
231 complain_overflow_dont,
232 nios2_elf32_lo16_relocate,
233 "R_NIOS2_LO16",
234 false,
235 0x003fffc0,
236 0x003fffc0,
237 false),
238
239 HOWTO (R_NIOS2_HIADJ16,
240 0,
241 4,
242 32,
243 false,
244 6,
245 complain_overflow_dont,
246 nios2_elf32_hiadj16_relocate,
247 "R_NIOS2_HIADJ16",
248 false,
249 0x003fffc0,
250 0x003fffc0,
251 false),
252
253 HOWTO (R_NIOS2_BFD_RELOC_32,
254 0,
255 4, /* long */
256 32,
257 false,
258 0,
259 complain_overflow_dont,
260 bfd_elf_generic_reloc,
261 "R_NIOS2_BFD_RELOC32",
262 false,
263 0xffffffff,
264 0xffffffff,
265 false),
266
267 HOWTO (R_NIOS2_BFD_RELOC_16,
268 0,
269 2, /* short */
270 16,
271 false,
272 0,
273 complain_overflow_bitfield,
274 bfd_elf_generic_reloc,
275 "R_NIOS2_BFD_RELOC16",
276 false,
277 0x0000ffff,
278 0x0000ffff,
279 false),
280
281 HOWTO (R_NIOS2_BFD_RELOC_8,
282 0,
283 1, /* byte */
284 8,
285 false,
286 0,
287 complain_overflow_bitfield,
288 bfd_elf_generic_reloc,
289 "R_NIOS2_BFD_RELOC8",
290 false,
291 0x000000ff,
292 0x000000ff,
293 false),
294
295 HOWTO (R_NIOS2_GPREL,
296 0,
297 4,
298 32,
299 false,
300 6,
301 complain_overflow_dont,
302 nios2_elf32_gprel_relocate,
303 "R_NIOS2_GPREL",
304 false,
305 0x003fffc0,
306 0x003fffc0,
307 false),
308
309 HOWTO (R_NIOS2_GNU_VTINHERIT,
310 0,
311 4,
312 0,
313 false,
314 0,
315 complain_overflow_dont,
316 NULL,
317 "R_NIOS2_GNU_VTINHERIT",
318 false,
319 0,
320 0,
321 false),
322
323 HOWTO (R_NIOS2_GNU_VTENTRY,
324 0,
325 4,
326 0,
327 false,
328 0,
329 complain_overflow_dont,
330 _bfd_elf_rel_vtable_reloc_fn,
331 "R_NIOS2_GNU_VTENTRY",
332 false,
333 0,
334 0,
335 false),
336
337 HOWTO (R_NIOS2_UJMP,
338 0,
339 4,
340 32,
341 false,
342 6,
343 complain_overflow_dont,
344 nios2_elf32_ujmp_relocate,
345 "R_NIOS2_UJMP",
346 false,
347 0x003fffc0,
348 0x003fffc0,
349 false),
350
351 HOWTO (R_NIOS2_CJMP,
352 0,
353 4,
354 32,
355 false,
356 6,
357 complain_overflow_dont,
358 nios2_elf32_cjmp_relocate,
359 "R_NIOS2_CJMP",
360 false,
361 0x003fffc0,
362 0x003fffc0,
363 false),
364
365 HOWTO (R_NIOS2_CALLR,
366 0,
367 4,
368 32,
369 false,
370 6,
371 complain_overflow_dont,
372 nios2_elf32_callr_relocate,
373 "R_NIOS2_CALLR",
374 false,
375 0x003fffc0,
376 0x003fffc0,
377 false),
378
379 HOWTO (R_NIOS2_ALIGN,
380 0,
381 4,
382 0,
383 false,
384 0,
385 complain_overflow_dont,
386 nios2_elf32_ignore_reloc,
387 "R_NIOS2_ALIGN",
388 false,
389 0,
390 0,
391 true),
392
393
394 HOWTO (R_NIOS2_GOT16,
395 0,
396 4,
397 16,
398 false,
399 6,
400 complain_overflow_bitfield,
401 bfd_elf_generic_reloc,
402 "R_NIOS2_GOT16",
403 false,
404 0x003fffc0,
405 0x003fffc0,
406 false),
407
408 HOWTO (R_NIOS2_CALL16,
409 0,
410 4,
411 16,
412 false,
413 6,
414 complain_overflow_bitfield,
415 bfd_elf_generic_reloc,
416 "R_NIOS2_CALL16",
417 false,
418 0x003fffc0,
419 0x003fffc0,
420 false),
421
422 HOWTO (R_NIOS2_GOTOFF_LO,
423 0,
424 4,
425 16,
426 false,
427 6,
428 complain_overflow_dont,
429 bfd_elf_generic_reloc,
430 "R_NIOS2_GOTOFF_LO",
431 false,
432 0x003fffc0,
433 0x003fffc0,
434 false),
435
436 HOWTO (R_NIOS2_GOTOFF_HA,
437 0,
438 4,
439 16,
440 false,
441 6,
442 complain_overflow_dont,
443 bfd_elf_generic_reloc,
444 "R_NIOS2_GOTOFF_HA",
445 false,
446 0x003fffc0,
447 0x003fffc0,
448 false),
449
450 HOWTO (R_NIOS2_PCREL_LO,
451 0,
452 4,
453 16,
454 true,
455 6,
456 complain_overflow_dont,
457 nios2_elf32_pcrel_lo16_relocate,
458 "R_NIOS2_PCREL_LO",
459 false,
460 0x003fffc0,
461 0x003fffc0,
462 true),
463
464 HOWTO (R_NIOS2_PCREL_HA,
465 0,
466 4,
467 16,
468 false, /* This is a PC-relative relocation, but we need to subtract
469 PC ourselves before the HIADJ. */
470 6,
471 complain_overflow_dont,
472 nios2_elf32_pcrel_hiadj16_relocate,
473 "R_NIOS2_PCREL_HA",
474 false,
475 0x003fffc0,
476 0x003fffc0,
477 true),
478
479 HOWTO (R_NIOS2_TLS_GD16,
480 0,
481 4,
482 16,
483 false,
484 6,
485 complain_overflow_bitfield,
486 bfd_elf_generic_reloc,
487 "R_NIOS2_TLS_GD16",
488 false,
489 0x003fffc0,
490 0x003fffc0,
491 false),
492
493 HOWTO (R_NIOS2_TLS_LDM16,
494 0,
495 4,
496 16,
497 false,
498 6,
499 complain_overflow_bitfield,
500 bfd_elf_generic_reloc,
501 "R_NIOS2_TLS_LDM16",
502 false,
503 0x003fffc0,
504 0x003fffc0,
505 false),
506
507 HOWTO (R_NIOS2_TLS_LDO16,
508 0,
509 4,
510 16,
511 false,
512 6,
513 complain_overflow_bitfield,
514 bfd_elf_generic_reloc,
515 "R_NIOS2_TLS_LDO16",
516 false,
517 0x003fffc0,
518 0x003fffc0,
519 false),
520
521 HOWTO (R_NIOS2_TLS_IE16,
522 0,
523 4,
524 16,
525 false,
526 6,
527 complain_overflow_bitfield,
528 bfd_elf_generic_reloc,
529 "R_NIOS2_TLS_IE16",
530 false,
531 0x003fffc0,
532 0x003fffc0,
533 false),
534
535 HOWTO (R_NIOS2_TLS_LE16,
536 0,
537 4,
538 16,
539 false,
540 6,
541 complain_overflow_bitfield,
542 bfd_elf_generic_reloc,
543 "R_NIOS2_TLS_LE16",
544 false,
545 0x003fffc0,
546 0x003fffc0,
547 false),
548
549 HOWTO (R_NIOS2_TLS_DTPMOD,
550 0,
551 4,
552 32,
553 false,
554 0,
555 complain_overflow_dont,
556 bfd_elf_generic_reloc,
557 "R_NIOS2_TLS_DTPMOD",
558 false,
559 0xffffffff,
560 0xffffffff,
561 false),
562
563 HOWTO (R_NIOS2_TLS_DTPREL,
564 0,
565 4,
566 32,
567 false,
568 0,
569 complain_overflow_dont,
570 bfd_elf_generic_reloc,
571 "R_NIOS2_TLS_DTPREL",
572 false,
573 0xffffffff,
574 0xffffffff,
575 false),
576
577 HOWTO (R_NIOS2_TLS_TPREL,
578 0,
579 4,
580 32,
581 false,
582 0,
583 complain_overflow_dont,
584 bfd_elf_generic_reloc,
585 "R_NIOS2_TLS_TPREL",
586 false,
587 0xffffffff,
588 0xffffffff,
589 false),
590
591 HOWTO (R_NIOS2_COPY,
592 0,
593 4,
594 32,
595 false,
596 0,
597 complain_overflow_dont,
598 bfd_elf_generic_reloc,
599 "R_NIOS2_COPY",
600 false,
601 0,
602 0,
603 false),
604
605 HOWTO (R_NIOS2_GLOB_DAT,
606 0,
607 4,
608 32,
609 false,
610 0,
611 complain_overflow_dont,
612 bfd_elf_generic_reloc,
613 "R_NIOS2_GLOB_DAT",
614 false,
615 0xffffffff,
616 0xffffffff,
617 false),
618
619 HOWTO (R_NIOS2_JUMP_SLOT,
620 0,
621 4,
622 32,
623 false,
624 0,
625 complain_overflow_dont,
626 bfd_elf_generic_reloc,
627 "R_NIOS2_JUMP_SLOT",
628 false,
629 0xffffffff,
630 0xffffffff,
631 false),
632
633 HOWTO (R_NIOS2_RELATIVE,
634 0,
635 4,
636 32,
637 false,
638 0,
639 complain_overflow_dont,
640 bfd_elf_generic_reloc,
641 "R_NIOS2_RELATIVE",
642 false,
643 0xffffffff,
644 0xffffffff,
645 false),
646
647 HOWTO (R_NIOS2_GOTOFF,
648 0,
649 4,
650 32,
651 false,
652 0,
653 complain_overflow_dont,
654 bfd_elf_generic_reloc,
655 "R_NIOS2_GOTOFF",
656 false,
657 0xffffffff,
658 0xffffffff,
659 false),
660
661 HOWTO (R_NIOS2_CALL26_NOAT, /* type */
662 2, /* rightshift */
663 4, /* size */
664 26, /* bitsize */
665 false, /* pc_relative */
666 6, /* bitpos */
667 complain_overflow_dont, /* complain on overflow */
668 nios2_elf32_call26_relocate, /* special function */
669 "R_NIOS2_CALL26_NOAT", /* name */
670 false, /* partial_inplace */
671 0xffffffc0, /* src_mask */
672 0xffffffc0, /* dst_mask */
673 false), /* pcrel_offset */
674
675 HOWTO (R_NIOS2_GOT_LO,
676 0,
677 4,
678 16,
679 false,
680 6,
681 complain_overflow_dont,
682 bfd_elf_generic_reloc,
683 "R_NIOS2_GOT_LO",
684 false,
685 0x003fffc0,
686 0x003fffc0,
687 false),
688
689 HOWTO (R_NIOS2_GOT_HA,
690 0,
691 4,
692 16,
693 false,
694 6,
695 complain_overflow_dont,
696 bfd_elf_generic_reloc,
697 "R_NIOS2_GOT_HA",
698 false,
699 0x003fffc0,
700 0x003fffc0,
701 false),
702
703 HOWTO (R_NIOS2_CALL_LO,
704 0,
705 4,
706 16,
707 false,
708 6,
709 complain_overflow_dont,
710 bfd_elf_generic_reloc,
711 "R_NIOS2_CALL_LO",
712 false,
713 0x003fffc0,
714 0x003fffc0,
715 false),
716
717 HOWTO (R_NIOS2_CALL_HA,
718 0,
719 4,
720 16,
721 false,
722 6,
723 complain_overflow_dont,
724 bfd_elf_generic_reloc,
725 "R_NIOS2_CALL_HA",
726 false,
727 0x003fffc0,
728 0x003fffc0,
729 false),
730
731 /* Add other relocations here. */
732 };
733
734 static reloc_howto_type elf_nios2_r2_howto_table_rel[] = {
735 /* No relocation. */
736 HOWTO (R_NIOS2_NONE, /* type */
737 0, /* rightshift */
738 0, /* size */
739 0, /* bitsize */
740 false, /* pc_relative */
741 0, /* bitpos */
742 complain_overflow_dont, /* complain_on_overflow */
743 bfd_elf_generic_reloc, /* special_function */
744 "R_NIOS2_NONE", /* name */
745 false, /* partial_inplace */
746 0, /* src_mask */
747 0, /* dst_mask */
748 false), /* pcrel_offset */
749
750 /* 16-bit signed immediate relocation. */
751 HOWTO (R_NIOS2_S16, /* type */
752 0, /* rightshift */
753 4, /* size */
754 16, /* bitsize */
755 false, /* pc_relative */
756 16, /* bitpos */
757 complain_overflow_signed, /* complain on overflow */
758 bfd_elf_generic_reloc, /* special function */
759 "R_NIOS2_S16", /* name */
760 false, /* partial_inplace */
761 0xffff0000, /* src_mask */
762 0xffff0000, /* dest_mask */
763 false), /* pcrel_offset */
764
765 /* 16-bit unsigned immediate relocation. */
766 HOWTO (R_NIOS2_U16, /* type */
767 0, /* rightshift */
768 4, /* size */
769 16, /* bitsize */
770 false, /* pc_relative */
771 16, /* bitpos */
772 complain_overflow_unsigned, /* complain on overflow */
773 bfd_elf_generic_reloc, /* special function */
774 "R_NIOS2_U16", /* name */
775 false, /* partial_inplace */
776 0xffff0000, /* src_mask */
777 0xffff0000, /* dest_mask */
778 false), /* pcrel_offset */
779
780 HOWTO (R_NIOS2_PCREL16, /* type */
781 0, /* rightshift */
782 4, /* size */
783 16, /* bitsize */
784 true, /* pc_relative */
785 16, /* bitpos */
786 complain_overflow_signed, /* complain on overflow */
787 nios2_elf32_pcrel16_relocate, /* special function */
788 "R_NIOS2_PCREL16", /* name */
789 false, /* partial_inplace */
790 0xffff0000, /* src_mask */
791 0xffff0000, /* dest_mask */
792 true), /* pcrel_offset */
793
794 HOWTO (R_NIOS2_CALL26, /* type */
795 2, /* rightshift */
796 4, /* size */
797 26, /* bitsize */
798 false, /* pc_relative */
799 6, /* bitpos */
800 complain_overflow_dont, /* complain on overflow */
801 nios2_elf32_call26_relocate, /* special function */
802 "R_NIOS2_CALL26", /* name */
803 false, /* partial_inplace */
804 0xffffffc0, /* src_mask */
805 0xffffffc0, /* dst_mask */
806 false), /* pcrel_offset */
807
808 HOWTO (R_NIOS2_IMM5,
809 0,
810 4,
811 5,
812 false,
813 21,
814 complain_overflow_bitfield,
815 bfd_elf_generic_reloc,
816 "R_NIOS2_IMM5",
817 false,
818 0x03e00000,
819 0x03e00000,
820 false),
821
822 HOWTO (R_NIOS2_CACHE_OPX,
823 0,
824 4,
825 5,
826 false,
827 11,
828 complain_overflow_bitfield,
829 bfd_elf_generic_reloc,
830 "R_NIOS2_CACHE_OPX",
831 false,
832 0x0000f800,
833 0x0000f800,
834 false),
835
836 HOWTO (R_NIOS2_IMM6,
837 0,
838 4,
839 6,
840 false,
841 26,
842 complain_overflow_bitfield,
843 bfd_elf_generic_reloc,
844 "R_NIOS2_IMM6",
845 false,
846 0xfc000000,
847 0xfc000000,
848 false),
849
850 HOWTO (R_NIOS2_IMM8,
851 0,
852 4,
853 8,
854 false,
855 24,
856 complain_overflow_bitfield,
857 bfd_elf_generic_reloc,
858 "R_NIOS2_IMM8",
859 false,
860 0xff000000,
861 0xff000000,
862 false),
863
864 HOWTO (R_NIOS2_HI16,
865 0,
866 4,
867 32,
868 false,
869 16,
870 complain_overflow_dont,
871 nios2_elf32_hi16_relocate,
872 "R_NIOS2_HI16",
873 false,
874 0xffff0000,
875 0xffff0000,
876 false),
877
878 HOWTO (R_NIOS2_LO16,
879 0,
880 4,
881 32,
882 false,
883 16,
884 complain_overflow_dont,
885 nios2_elf32_lo16_relocate,
886 "R_NIOS2_LO16",
887 false,
888 0xffff0000,
889 0xffff0000,
890 false),
891
892 HOWTO (R_NIOS2_HIADJ16,
893 0,
894 4,
895 32,
896 false,
897 16,
898 complain_overflow_dont,
899 nios2_elf32_hiadj16_relocate,
900 "R_NIOS2_HIADJ16",
901 false,
902 0xffff0000,
903 0xffff0000,
904 false),
905
906 HOWTO (R_NIOS2_BFD_RELOC_32,
907 0,
908 4, /* long */
909 32,
910 false,
911 0,
912 complain_overflow_dont,
913 bfd_elf_generic_reloc,
914 "R_NIOS2_BFD_RELOC32",
915 false,
916 0xffffffff,
917 0xffffffff,
918 false),
919
920 HOWTO (R_NIOS2_BFD_RELOC_16,
921 0,
922 2, /* short */
923 16,
924 false,
925 0,
926 complain_overflow_bitfield,
927 bfd_elf_generic_reloc,
928 "R_NIOS2_BFD_RELOC16",
929 false,
930 0x0000ffff,
931 0x0000ffff,
932 false),
933
934 HOWTO (R_NIOS2_BFD_RELOC_8,
935 0,
936 1, /* byte */
937 8,
938 false,
939 0,
940 complain_overflow_bitfield,
941 bfd_elf_generic_reloc,
942 "R_NIOS2_BFD_RELOC8",
943 false,
944 0x000000ff,
945 0x000000ff,
946 false),
947
948 HOWTO (R_NIOS2_GPREL,
949 0,
950 4,
951 32,
952 false,
953 16,
954 complain_overflow_dont,
955 nios2_elf32_gprel_relocate,
956 "R_NIOS2_GPREL",
957 false,
958 0xffff0000,
959 0xffff0000,
960 false),
961
962 HOWTO (R_NIOS2_GNU_VTINHERIT,
963 0,
964 4,
965 0,
966 false,
967 0,
968 complain_overflow_dont,
969 NULL,
970 "R_NIOS2_GNU_VTINHERIT",
971 false,
972 0,
973 0,
974 false),
975
976 HOWTO (R_NIOS2_GNU_VTENTRY,
977 0,
978 4,
979 0,
980 false,
981 0,
982 complain_overflow_dont,
983 _bfd_elf_rel_vtable_reloc_fn,
984 "R_NIOS2_GNU_VTENTRY",
985 false,
986 0,
987 0,
988 false),
989
990 HOWTO (R_NIOS2_UJMP,
991 0,
992 4,
993 32,
994 false,
995 16,
996 complain_overflow_dont,
997 nios2_elf32_ujmp_relocate,
998 "R_NIOS2_UJMP",
999 false,
1000 0xffff0000,
1001 0xffff0000,
1002 false),
1003
1004 HOWTO (R_NIOS2_CJMP,
1005 0,
1006 4,
1007 32,
1008 false,
1009 16,
1010 complain_overflow_dont,
1011 nios2_elf32_cjmp_relocate,
1012 "R_NIOS2_CJMP",
1013 false,
1014 0xffff0000,
1015 0xffff0000,
1016 false),
1017
1018 HOWTO (R_NIOS2_CALLR,
1019 0,
1020 4,
1021 32,
1022 false,
1023 16,
1024 complain_overflow_dont,
1025 nios2_elf32_callr_relocate,
1026 "R_NIOS2_CALLR",
1027 false,
1028 0xffff0000,
1029 0xffff0000,
1030 false),
1031
1032 HOWTO (R_NIOS2_ALIGN,
1033 0,
1034 4,
1035 0,
1036 false,
1037 0,
1038 complain_overflow_dont,
1039 nios2_elf32_ignore_reloc,
1040 "R_NIOS2_ALIGN",
1041 false,
1042 0,
1043 0,
1044 true),
1045
1046 HOWTO (R_NIOS2_GOT16,
1047 0,
1048 4,
1049 16,
1050 false,
1051 16,
1052 complain_overflow_bitfield,
1053 bfd_elf_generic_reloc,
1054 "R_NIOS2_GOT16",
1055 false,
1056 0xffff0000,
1057 0xffff0000,
1058 false),
1059
1060 HOWTO (R_NIOS2_CALL16,
1061 0,
1062 4,
1063 16,
1064 false,
1065 16,
1066 complain_overflow_bitfield,
1067 bfd_elf_generic_reloc,
1068 "R_NIOS2_CALL16",
1069 false,
1070 0xffff0000,
1071 0xffff0000,
1072 false),
1073
1074 HOWTO (R_NIOS2_GOTOFF_LO,
1075 0,
1076 4,
1077 16,
1078 false,
1079 16,
1080 complain_overflow_dont,
1081 bfd_elf_generic_reloc,
1082 "R_NIOS2_GOTOFF_LO",
1083 false,
1084 0xffff0000,
1085 0xffff0000,
1086 false),
1087
1088 HOWTO (R_NIOS2_GOTOFF_HA,
1089 0,
1090 4,
1091 16,
1092 false,
1093 16,
1094 complain_overflow_dont,
1095 bfd_elf_generic_reloc,
1096 "R_NIOS2_GOTOFF_HA",
1097 false,
1098 0xffff0000,
1099 0xffff0000,
1100 false),
1101
1102 HOWTO (R_NIOS2_PCREL_LO,
1103 0,
1104 4,
1105 16,
1106 true,
1107 16,
1108 complain_overflow_dont,
1109 nios2_elf32_pcrel_lo16_relocate,
1110 "R_NIOS2_PCREL_LO",
1111 false,
1112 0xffff0000,
1113 0xffff0000,
1114 true),
1115
1116 HOWTO (R_NIOS2_PCREL_HA,
1117 0,
1118 4,
1119 16,
1120 false, /* This is a PC-relative relocation, but we need to subtract
1121 PC ourselves before the HIADJ. */
1122 16,
1123 complain_overflow_dont,
1124 nios2_elf32_pcrel_hiadj16_relocate,
1125 "R_NIOS2_PCREL_HA",
1126 false,
1127 0xffff0000,
1128 0xffff0000,
1129 true),
1130
1131 HOWTO (R_NIOS2_TLS_GD16,
1132 0,
1133 4,
1134 16,
1135 false,
1136 16,
1137 complain_overflow_bitfield,
1138 bfd_elf_generic_reloc,
1139 "R_NIOS2_TLS_GD16",
1140 false,
1141 0xffff0000,
1142 0xffff0000,
1143 false),
1144
1145 HOWTO (R_NIOS2_TLS_LDM16,
1146 0,
1147 4,
1148 16,
1149 false,
1150 16,
1151 complain_overflow_bitfield,
1152 bfd_elf_generic_reloc,
1153 "R_NIOS2_TLS_LDM16",
1154 false,
1155 0xffff0000,
1156 0xffff0000,
1157 false),
1158
1159 HOWTO (R_NIOS2_TLS_LDO16,
1160 0,
1161 4,
1162 16,
1163 false,
1164 16,
1165 complain_overflow_bitfield,
1166 bfd_elf_generic_reloc,
1167 "R_NIOS2_TLS_LDO16",
1168 false,
1169 0xffff0000,
1170 0xffff0000,
1171 false),
1172
1173 HOWTO (R_NIOS2_TLS_IE16,
1174 0,
1175 4,
1176 16,
1177 false,
1178 16,
1179 complain_overflow_bitfield,
1180 bfd_elf_generic_reloc,
1181 "R_NIOS2_TLS_IE16",
1182 false,
1183 0xffff0000,
1184 0xffff0000,
1185 false),
1186
1187 HOWTO (R_NIOS2_TLS_LE16,
1188 0,
1189 4,
1190 16,
1191 false,
1192 16,
1193 complain_overflow_bitfield,
1194 bfd_elf_generic_reloc,
1195 "R_NIOS2_TLS_LE16",
1196 false,
1197 0xffff0000,
1198 0xffff0000,
1199 false),
1200
1201 HOWTO (R_NIOS2_TLS_DTPMOD,
1202 0,
1203 4,
1204 32,
1205 false,
1206 0,
1207 complain_overflow_dont,
1208 bfd_elf_generic_reloc,
1209 "R_NIOS2_TLS_DTPMOD",
1210 false,
1211 0xffffffff,
1212 0xffffffff,
1213 false),
1214
1215 HOWTO (R_NIOS2_TLS_DTPREL,
1216 0,
1217 4,
1218 32,
1219 false,
1220 0,
1221 complain_overflow_dont,
1222 bfd_elf_generic_reloc,
1223 "R_NIOS2_TLS_DTPREL",
1224 false,
1225 0xffffffff,
1226 0xffffffff,
1227 false),
1228
1229 HOWTO (R_NIOS2_TLS_TPREL,
1230 0,
1231 4,
1232 32,
1233 false,
1234 0,
1235 complain_overflow_dont,
1236 bfd_elf_generic_reloc,
1237 "R_NIOS2_TLS_TPREL",
1238 false,
1239 0xffffffff,
1240 0xffffffff,
1241 false),
1242
1243 HOWTO (R_NIOS2_COPY,
1244 0,
1245 4,
1246 32,
1247 false,
1248 0,
1249 complain_overflow_dont,
1250 bfd_elf_generic_reloc,
1251 "R_NIOS2_COPY",
1252 false,
1253 0,
1254 0,
1255 false),
1256
1257 HOWTO (R_NIOS2_GLOB_DAT,
1258 0,
1259 4,
1260 32,
1261 false,
1262 0,
1263 complain_overflow_dont,
1264 bfd_elf_generic_reloc,
1265 "R_NIOS2_GLOB_DAT",
1266 false,
1267 0xffffffff,
1268 0xffffffff,
1269 false),
1270
1271 HOWTO (R_NIOS2_JUMP_SLOT,
1272 0,
1273 4,
1274 32,
1275 false,
1276 0,
1277 complain_overflow_dont,
1278 bfd_elf_generic_reloc,
1279 "R_NIOS2_JUMP_SLOT",
1280 false,
1281 0xffffffff,
1282 0xffffffff,
1283 false),
1284
1285 HOWTO (R_NIOS2_RELATIVE,
1286 0,
1287 4,
1288 32,
1289 false,
1290 0,
1291 complain_overflow_dont,
1292 bfd_elf_generic_reloc,
1293 "R_NIOS2_RELATIVE",
1294 false,
1295 0xffffffff,
1296 0xffffffff,
1297 false),
1298
1299 HOWTO (R_NIOS2_GOTOFF,
1300 0,
1301 4,
1302 32,
1303 false,
1304 0,
1305 complain_overflow_dont,
1306 bfd_elf_generic_reloc,
1307 "R_NIOS2_GOTOFF",
1308 false,
1309 0xffffffff,
1310 0xffffffff,
1311 false),
1312
1313 HOWTO (R_NIOS2_CALL26_NOAT, /* type */
1314 2, /* rightshift */
1315 4, /* size */
1316 26, /* bitsize */
1317 false, /* pc_relative */
1318 6, /* bitpos */
1319 complain_overflow_dont, /* complain on overflow */
1320 nios2_elf32_call26_relocate, /* special function */
1321 "R_NIOS2_CALL26_NOAT", /* name */
1322 false, /* partial_inplace */
1323 0xffffffc0, /* src_mask */
1324 0xffffffc0, /* dst_mask */
1325 false), /* pcrel_offset */
1326
1327 HOWTO (R_NIOS2_GOT_LO,
1328 0,
1329 4,
1330 16,
1331 false,
1332 16,
1333 complain_overflow_dont,
1334 bfd_elf_generic_reloc,
1335 "R_NIOS2_GOT_LO",
1336 false,
1337 0xffff0000,
1338 0xffff0000,
1339 false),
1340
1341 HOWTO (R_NIOS2_GOT_HA,
1342 0,
1343 4,
1344 16,
1345 false,
1346 16,
1347 complain_overflow_dont,
1348 bfd_elf_generic_reloc,
1349 "R_NIOS2_GOT_HA",
1350 false,
1351 0xffff0000,
1352 0xffff0000,
1353 false),
1354
1355 HOWTO (R_NIOS2_CALL_LO,
1356 0,
1357 4,
1358 16,
1359 false,
1360 16,
1361 complain_overflow_dont,
1362 bfd_elf_generic_reloc,
1363 "R_NIOS2_CALL_LO",
1364 false,
1365 0xffff0000,
1366 0xffff0000,
1367 false),
1368
1369 HOWTO (R_NIOS2_CALL_HA,
1370 0,
1371 4,
1372 16,
1373 false,
1374 16,
1375 complain_overflow_dont,
1376 bfd_elf_generic_reloc,
1377 "R_NIOS2_CALL_HA",
1378 false,
1379 0xffff0000,
1380 0xffff0000,
1381 false),
1382
1383 HOWTO (R_NIOS2_R2_S12,
1384 0,
1385 4,
1386 12,
1387 false,
1388 16,
1389 complain_overflow_signed,
1390 bfd_elf_generic_reloc,
1391 "R_NIOS2_R2_S12",
1392 false,
1393 0x0fff0000,
1394 0x0fff0000,
1395 false),
1396
1397 HOWTO (R_NIOS2_R2_I10_1_PCREL,
1398 1,
1399 2,
1400 10,
1401 true,
1402 6,
1403 complain_overflow_signed,
1404 bfd_elf_generic_reloc, /* FIXME? */
1405 "R_NIOS2_R2_I10_1_PCREL",
1406 false,
1407 0xffc0,
1408 0xffc0,
1409 true),
1410
1411 HOWTO (R_NIOS2_R2_T1I7_1_PCREL,
1412 1,
1413 2,
1414 7,
1415 true,
1416 9,
1417 complain_overflow_signed,
1418 bfd_elf_generic_reloc, /* FIXME? */
1419 "R_NIOS2_R2_T1I7_1_PCREL",
1420 false,
1421 0xfe00,
1422 0xfe00,
1423 true),
1424
1425 HOWTO (R_NIOS2_R2_T1I7_2,
1426 2,
1427 2,
1428 7,
1429 false,
1430 9,
1431 complain_overflow_unsigned,
1432 bfd_elf_generic_reloc,
1433 "R_NIOS2_R2_T1I7_2",
1434 false,
1435 0xfe00,
1436 0xfe00,
1437 false),
1438
1439 HOWTO (R_NIOS2_R2_T2I4,
1440 0,
1441 2,
1442 4,
1443 false,
1444 12,
1445 complain_overflow_unsigned,
1446 bfd_elf_generic_reloc,
1447 "R_NIOS2_R2_T2I4",
1448 false,
1449 0xf000,
1450 0xf000,
1451 false),
1452
1453 HOWTO (R_NIOS2_R2_T2I4_1,
1454 1,
1455 2,
1456 4,
1457 false,
1458 12,
1459 complain_overflow_unsigned,
1460 bfd_elf_generic_reloc,
1461 "R_NIOS2_R2_T2I4_1",
1462 false,
1463 0xf000,
1464 0xf000,
1465 false),
1466
1467 HOWTO (R_NIOS2_R2_T2I4_2,
1468 2,
1469 2,
1470 4,
1471 false,
1472 12,
1473 complain_overflow_unsigned,
1474 bfd_elf_generic_reloc,
1475 "R_NIOS2_R2_T2I4_2",
1476 false,
1477 0xf000,
1478 0xf000,
1479 false),
1480
1481 HOWTO (R_NIOS2_R2_X1I7_2,
1482 2,
1483 2,
1484 7,
1485 false,
1486 6,
1487 complain_overflow_unsigned,
1488 bfd_elf_generic_reloc,
1489 "R_NIOS2_R2_X1I7_2",
1490 false,
1491 0x1fc0,
1492 0x1fc0,
1493 false),
1494
1495 HOWTO (R_NIOS2_R2_X2L5,
1496 0,
1497 2,
1498 5,
1499 false,
1500 6,
1501 complain_overflow_unsigned,
1502 bfd_elf_generic_reloc,
1503 "R_NIOS2_R2_X2L5",
1504 false,
1505 0x07c0,
1506 0x07c0,
1507 false),
1508
1509 HOWTO (R_NIOS2_R2_F1I5_2,
1510 2,
1511 2,
1512 5,
1513 false,
1514 6,
1515 complain_overflow_unsigned,
1516 bfd_elf_generic_reloc,
1517 "R_NIOS2_R2_F1L5_2",
1518 false,
1519 0x07c0,
1520 0x07c0,
1521 false),
1522
1523 HOWTO (R_NIOS2_R2_L5I4X1,
1524 2,
1525 2,
1526 4,
1527 false,
1528 6,
1529 complain_overflow_unsigned,
1530 bfd_elf_generic_reloc,
1531 "R_NIOS2_R2_L5I4X1",
1532 false,
1533 0x03c0,
1534 0x03c0,
1535 false),
1536
1537 HOWTO (R_NIOS2_R2_T1X1I6,
1538 0,
1539 2,
1540 6,
1541 false,
1542 9,
1543 complain_overflow_unsigned,
1544 bfd_elf_generic_reloc,
1545 "R_NIOS2_R2_T1X1I6",
1546 false,
1547 0x7e00,
1548 0x7e00,
1549 false),
1550
1551 HOWTO (R_NIOS2_R2_T1X1I6_2,
1552 2,
1553 4,
1554 6,
1555 false,
1556 9,
1557 complain_overflow_unsigned,
1558 bfd_elf_generic_reloc,
1559 "R_NIOS2_R2_T1I1X6_2",
1560 false,
1561 0x7e00,
1562 0x7e00,
1563 false),
1564
1565 /* Add other relocations here. */
1566 };
1567
1568 static unsigned char elf_code_to_howto_index[R_NIOS2_ILLEGAL + 1];
1569
1570
1571 /* Return true if producing output for a R2 BFD. */
1572 #define BFD_IS_R2(abfd) (bfd_get_mach (abfd) == bfd_mach_nios2r2)
1573
1574 /* Return the howto for relocation RTYPE. */
1575 static reloc_howto_type *
1576 lookup_howto (unsigned int rtype, bfd *abfd)
1577 {
1578 static int initialized = 0;
1579 int i;
1580 /* R2 relocations are a superset of R1, so use that for the lookup
1581 table. */
1582 int r1_howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r1_howto_table_rel);
1583 int r2_howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r2_howto_table_rel);
1584
1585 if (!initialized)
1586 {
1587 initialized = 1;
1588 memset (elf_code_to_howto_index, 0xff,
1589 sizeof (elf_code_to_howto_index));
1590 for (i = 0; i < r2_howto_tbl_size; i++)
1591 {
1592 elf_code_to_howto_index[elf_nios2_r2_howto_table_rel[i].type] = i;
1593 if (i < r1_howto_tbl_size)
1594 BFD_ASSERT (elf_nios2_r2_howto_table_rel[i].type
1595 == elf_nios2_r1_howto_table_rel[i].type);
1596 }
1597 }
1598
1599 if (rtype > R_NIOS2_ILLEGAL)
1600 return NULL;
1601 i = elf_code_to_howto_index[rtype];
1602 if (BFD_IS_R2 (abfd))
1603 {
1604 if (i >= r2_howto_tbl_size)
1605 return NULL;
1606 return elf_nios2_r2_howto_table_rel + i;
1607 }
1608 else
1609 {
1610 if (i >= r1_howto_tbl_size)
1611 return NULL;
1612 return elf_nios2_r1_howto_table_rel + i;
1613 }
1614 }
1615
1616 /* Map for converting BFD reloc types to Nios II reloc types. */
1617 struct elf_reloc_map
1618 {
1619 bfd_reloc_code_real_type bfd_val;
1620 enum elf_nios2_reloc_type elf_val;
1621 };
1622
1623 static const struct elf_reloc_map nios2_reloc_map[] =
1624 {
1625 {BFD_RELOC_NONE, R_NIOS2_NONE},
1626 {BFD_RELOC_NIOS2_S16, R_NIOS2_S16},
1627 {BFD_RELOC_NIOS2_U16, R_NIOS2_U16},
1628 {BFD_RELOC_16_PCREL, R_NIOS2_PCREL16},
1629 {BFD_RELOC_NIOS2_CALL26, R_NIOS2_CALL26},
1630 {BFD_RELOC_NIOS2_IMM5, R_NIOS2_IMM5},
1631 {BFD_RELOC_NIOS2_CACHE_OPX, R_NIOS2_CACHE_OPX},
1632 {BFD_RELOC_NIOS2_IMM6, R_NIOS2_IMM6},
1633 {BFD_RELOC_NIOS2_IMM8, R_NIOS2_IMM8},
1634 {BFD_RELOC_NIOS2_HI16, R_NIOS2_HI16},
1635 {BFD_RELOC_NIOS2_LO16, R_NIOS2_LO16},
1636 {BFD_RELOC_NIOS2_HIADJ16, R_NIOS2_HIADJ16},
1637 {BFD_RELOC_32, R_NIOS2_BFD_RELOC_32},
1638 {BFD_RELOC_16, R_NIOS2_BFD_RELOC_16},
1639 {BFD_RELOC_8, R_NIOS2_BFD_RELOC_8},
1640 {BFD_RELOC_NIOS2_GPREL, R_NIOS2_GPREL},
1641 {BFD_RELOC_VTABLE_INHERIT, R_NIOS2_GNU_VTINHERIT},
1642 {BFD_RELOC_VTABLE_ENTRY, R_NIOS2_GNU_VTENTRY},
1643 {BFD_RELOC_NIOS2_UJMP, R_NIOS2_UJMP},
1644 {BFD_RELOC_NIOS2_CJMP, R_NIOS2_CJMP},
1645 {BFD_RELOC_NIOS2_CALLR, R_NIOS2_CALLR},
1646 {BFD_RELOC_NIOS2_ALIGN, R_NIOS2_ALIGN},
1647 {BFD_RELOC_NIOS2_GOT16, R_NIOS2_GOT16},
1648 {BFD_RELOC_NIOS2_CALL16, R_NIOS2_CALL16},
1649 {BFD_RELOC_NIOS2_GOTOFF_LO, R_NIOS2_GOTOFF_LO},
1650 {BFD_RELOC_NIOS2_GOTOFF_HA, R_NIOS2_GOTOFF_HA},
1651 {BFD_RELOC_NIOS2_PCREL_LO, R_NIOS2_PCREL_LO},
1652 {BFD_RELOC_NIOS2_PCREL_HA, R_NIOS2_PCREL_HA},
1653 {BFD_RELOC_NIOS2_TLS_GD16, R_NIOS2_TLS_GD16},
1654 {BFD_RELOC_NIOS2_TLS_LDM16, R_NIOS2_TLS_LDM16},
1655 {BFD_RELOC_NIOS2_TLS_LDO16, R_NIOS2_TLS_LDO16},
1656 {BFD_RELOC_NIOS2_TLS_IE16, R_NIOS2_TLS_IE16},
1657 {BFD_RELOC_NIOS2_TLS_LE16, R_NIOS2_TLS_LE16},
1658 {BFD_RELOC_NIOS2_TLS_DTPMOD, R_NIOS2_TLS_DTPMOD},
1659 {BFD_RELOC_NIOS2_TLS_DTPREL, R_NIOS2_TLS_DTPREL},
1660 {BFD_RELOC_NIOS2_TLS_TPREL, R_NIOS2_TLS_TPREL},
1661 {BFD_RELOC_NIOS2_COPY, R_NIOS2_COPY},
1662 {BFD_RELOC_NIOS2_GLOB_DAT, R_NIOS2_GLOB_DAT},
1663 {BFD_RELOC_NIOS2_JUMP_SLOT, R_NIOS2_JUMP_SLOT},
1664 {BFD_RELOC_NIOS2_RELATIVE, R_NIOS2_RELATIVE},
1665 {BFD_RELOC_NIOS2_GOTOFF, R_NIOS2_GOTOFF},
1666 {BFD_RELOC_NIOS2_CALL26_NOAT, R_NIOS2_CALL26_NOAT},
1667 {BFD_RELOC_NIOS2_GOT_LO, R_NIOS2_GOT_LO},
1668 {BFD_RELOC_NIOS2_GOT_HA, R_NIOS2_GOT_HA},
1669 {BFD_RELOC_NIOS2_CALL_LO, R_NIOS2_CALL_LO},
1670 {BFD_RELOC_NIOS2_CALL_HA, R_NIOS2_CALL_HA},
1671 {BFD_RELOC_NIOS2_R2_S12, R_NIOS2_R2_S12},
1672 {BFD_RELOC_NIOS2_R2_I10_1_PCREL, R_NIOS2_R2_I10_1_PCREL},
1673 {BFD_RELOC_NIOS2_R2_T1I7_1_PCREL, R_NIOS2_R2_T1I7_1_PCREL},
1674 {BFD_RELOC_NIOS2_R2_T1I7_2, R_NIOS2_R2_T1I7_2},
1675 {BFD_RELOC_NIOS2_R2_T2I4, R_NIOS2_R2_T2I4},
1676 {BFD_RELOC_NIOS2_R2_T2I4_1, R_NIOS2_R2_T2I4_1},
1677 {BFD_RELOC_NIOS2_R2_T2I4_2, R_NIOS2_R2_T2I4_2},
1678 {BFD_RELOC_NIOS2_R2_X1I7_2, R_NIOS2_R2_X1I7_2},
1679 {BFD_RELOC_NIOS2_R2_X2L5, R_NIOS2_R2_X2L5},
1680 {BFD_RELOC_NIOS2_R2_F1I5_2, R_NIOS2_R2_F1I5_2},
1681 {BFD_RELOC_NIOS2_R2_L5I4X1, R_NIOS2_R2_L5I4X1},
1682 {BFD_RELOC_NIOS2_R2_T1X1I6, R_NIOS2_R2_T1X1I6},
1683 {BFD_RELOC_NIOS2_R2_T1X1I6_2, R_NIOS2_R2_T1X1I6_2},
1684 };
1685
1686 enum elf32_nios2_stub_type
1687 {
1688 nios2_stub_call26_before,
1689 nios2_stub_call26_after,
1690 nios2_stub_none
1691 };
1692
1693 struct elf32_nios2_stub_hash_entry
1694 {
1695 /* Base hash table entry structure. */
1696 struct bfd_hash_entry bh_root;
1697
1698 /* The stub section. */
1699 asection *stub_sec;
1700
1701 /* Offset within stub_sec of the beginning of this stub. */
1702 bfd_vma stub_offset;
1703
1704 /* Given the symbol's value and its section we can determine its final
1705 value when building the stubs (so the stub knows where to jump. */
1706 bfd_vma target_value;
1707 asection *target_section;
1708
1709 enum elf32_nios2_stub_type stub_type;
1710
1711 /* The symbol table entry, if any, that this was derived from. */
1712 struct elf32_nios2_link_hash_entry *hh;
1713
1714 /* And the reloc addend that this was derived from. */
1715 bfd_vma addend;
1716
1717 /* Where this stub is being called from, or, in the case of combined
1718 stub sections, the first input section in the group. */
1719 asection *id_sec;
1720 };
1721
1722 #define nios2_stub_hash_entry(ent) \
1723 ((struct elf32_nios2_stub_hash_entry *)(ent))
1724
1725 #define nios2_stub_hash_lookup(table, string, create, copy) \
1726 ((struct elf32_nios2_stub_hash_entry *) \
1727 bfd_hash_lookup ((table), (string), (create), (copy)))
1728
1729
1730 /* Nios II ELF linker hash entry. */
1731
1732 struct elf32_nios2_link_hash_entry
1733 {
1734 struct elf_link_hash_entry root;
1735
1736 /* A pointer to the most recently used stub hash entry against this
1737 symbol. */
1738 struct elf32_nios2_stub_hash_entry *hsh_cache;
1739
1740 #define GOT_UNKNOWN 0
1741 #define GOT_NORMAL 1
1742 #define GOT_TLS_GD 2
1743 #define GOT_TLS_IE 4
1744 unsigned char tls_type;
1745
1746 /* We need to detect and take special action for symbols which are only
1747 referenced with %call() and not with %got(). Such symbols do not need
1748 a dynamic GOT reloc in shared objects, only a dynamic PLT reloc. Lazy
1749 linking will not work if the dynamic GOT reloc exists.
1750 To check for this condition efficiently, we compare got_types_used against
1751 CALL_USED, meaning
1752 (got_types_used & (GOT_USED | CALL_USED)) == CALL_USED.
1753 */
1754 #define GOT_USED 1
1755 #define CALL_USED 2
1756 unsigned char got_types_used;
1757 };
1758
1759 #define elf32_nios2_hash_entry(ent) \
1760 ((struct elf32_nios2_link_hash_entry *) (ent))
1761
1762 /* Get the Nios II elf linker hash table from a link_info structure. */
1763 #define elf32_nios2_hash_table(info) \
1764 ((struct elf32_nios2_link_hash_table *) ((info)->hash))
1765
1766 /* Nios II ELF linker hash table. */
1767 struct elf32_nios2_link_hash_table
1768 {
1769 /* The main hash table. */
1770 struct elf_link_hash_table root;
1771
1772 /* The stub hash table. */
1773 struct bfd_hash_table bstab;
1774
1775 /* Linker stub bfd. */
1776 bfd *stub_bfd;
1777
1778 /* Linker call-backs. */
1779 asection * (*add_stub_section) (const char *, asection *, bool);
1780 void (*layout_sections_again) (void);
1781
1782 /* Array to keep track of which stub sections have been created, and
1783 information on stub grouping. */
1784 struct map_stub
1785 {
1786 /* These are the section to which stubs in the group will be
1787 attached. */
1788 asection *first_sec, *last_sec;
1789 /* The stub sections. There might be stubs inserted either before
1790 or after the real section.*/
1791 asection *first_stub_sec, *last_stub_sec;
1792 } *stub_group;
1793
1794 /* Assorted information used by nios2_elf32_size_stubs. */
1795 unsigned int bfd_count;
1796 unsigned int top_index;
1797 asection **input_list;
1798 Elf_Internal_Sym **all_local_syms;
1799
1800 /* Short-cuts to get to dynamic linker sections. */
1801 asection *sbss;
1802
1803 /* GOT pointer symbol _gp_got. */
1804 struct elf_link_hash_entry *h_gp_got;
1805
1806 union {
1807 bfd_signed_vma refcount;
1808 bfd_vma offset;
1809 } tls_ldm_got;
1810
1811 bfd_vma res_n_size;
1812 };
1813
1814 struct nios2_elf32_obj_tdata
1815 {
1816 struct elf_obj_tdata root;
1817
1818 /* tls_type for each local got entry. */
1819 char *local_got_tls_type;
1820
1821 /* TRUE if TLS GD relocs have been seen for this object. */
1822 bool has_tlsgd;
1823 };
1824
1825 #define elf32_nios2_tdata(abfd) \
1826 ((struct nios2_elf32_obj_tdata *) (abfd)->tdata.any)
1827
1828 #define elf32_nios2_local_got_tls_type(abfd) \
1829 (elf32_nios2_tdata (abfd)->local_got_tls_type)
1830
1831 /* The name of the dynamic interpreter. This is put in the .interp
1832 section. */
1833 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
1834
1835 /* PLT implementation for position-dependent code. */
1836 static const bfd_vma nios2_plt_entry[] = { /* .PLTn: */
1837 0x03c00034, /* movhi r15, %hiadj(plt_got_slot_address) */
1838 0x7bc00017, /* ldw r15, %lo(plt_got_slot_address)(r15) */
1839 0x7800683a /* jmp r15 */
1840 };
1841
1842 static const bfd_vma nios2_plt0_entry[] = { /* .PLTresolve */
1843 0x03800034, /* movhi r14, %hiadj(res_0) */
1844 0x73800004, /* addi r14, r14, %lo(res_0) */
1845 0x7b9fc83a, /* sub r15, r15, r14 */
1846 0x03400034, /* movhi r13, %hiadj(_GLOBAL_OFFSET_TABLE_) */
1847 0x6b800017, /* ldw r14, %lo(_GLOBAL_OFFSET_TABLE_+4)(r13) */
1848 0x6b400017, /* ldw r13, %lo(_GLOBAL_OFFSET_TABLE_+8)(r13) */
1849 0x6800683a /* jmp r13 */
1850 };
1851
1852 /* PLT implementation for position-independent code. */
1853 static const bfd_vma nios2_so_plt_entry[] = { /* .PLTn */
1854 0x03c00034, /* movhi r15, %hiadj(index * 4) */
1855 0x7bc00004, /* addi r15, r15, %lo(index * 4) */
1856 0x00000006 /* br .PLTresolve */
1857 };
1858
1859 static const bfd_vma nios2_so_plt0_entry[] = { /* .PLTresolve */
1860 0x001ce03a, /* nextpc r14 */
1861 0x03400034, /* movhi r13, %hiadj(_GLOBAL_OFFSET_TABLE_) */
1862 0x6b9b883a, /* add r13, r13, r14 */
1863 0x6b800017, /* ldw r14, %lo(_GLOBAL_OFFSET_TABLE_+4)(r13) */
1864 0x6b400017, /* ldw r13, %lo(_GLOBAL_OFFSET_TABLE_+8)(r13) */
1865 0x6800683a /* jmp r13 */
1866 };
1867
1868 /* CALL26 stub. */
1869 static const bfd_vma nios2_call26_stub_entry[] = {
1870 0x00400034, /* orhi at, r0, %hiadj(dest) */
1871 0x08400004, /* addi at, at, %lo(dest) */
1872 0x0800683a /* jmp at */
1873 };
1874
1875 /* Install 16-bit immediate value VALUE at offset OFFSET into section SEC. */
1876 static void
1877 nios2_elf32_install_imm16 (asection *sec, bfd_vma offset, bfd_vma value)
1878 {
1879 bfd_vma word = bfd_get_32 (sec->owner, sec->contents + offset);
1880
1881 bfd_put_32 (sec->owner, word | ((value & 0xffff) << 6),
1882 sec->contents + offset);
1883 }
1884
1885 /* Install COUNT 32-bit values DATA starting at offset OFFSET into
1886 section SEC. */
1887 static void
1888 nios2_elf32_install_data (asection *sec, const bfd_vma *data, bfd_vma offset,
1889 int count)
1890 {
1891 while (count--)
1892 {
1893 bfd_put_32 (sec->owner, *data, sec->contents + offset);
1894 offset += 4;
1895 ++data;
1896 }
1897 }
1898
1899 /* The usual way of loading a 32-bit constant into a Nios II register is to
1900 load the high 16 bits in one instruction and then add the low 16 bits with
1901 a signed add. This means that the high halfword needs to be adjusted to
1902 compensate for the sign bit of the low halfword. This function returns the
1903 adjusted high halfword for a given 32-bit constant. */
1904 static
1905 bfd_vma hiadj (bfd_vma symbol_value)
1906 {
1907 return ((symbol_value + 0x8000) >> 16) & 0xffff;
1908 }
1909
1910 /* Implement elf_backend_grok_prstatus:
1911 Support for core dump NOTE sections. */
1912 static bool
1913 nios2_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
1914 {
1915 int offset;
1916 size_t size;
1917
1918 switch (note->descsz)
1919 {
1920 default:
1921 return false;
1922
1923 case 212: /* Linux/Nios II */
1924 /* pr_cursig */
1925 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
1926
1927 /* pr_pid */
1928 elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
1929
1930 /* pr_reg */
1931 offset = 72;
1932 size = 136;
1933
1934 break;
1935 }
1936
1937 /* Make a ".reg/999" section. */
1938 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
1939 size, note->descpos + offset);
1940 }
1941
1942 /* Implement elf_backend_grok_psinfo. */
1943 static bool
1944 nios2_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
1945 {
1946 switch (note->descsz)
1947 {
1948 default:
1949 return false;
1950
1951 case 124: /* Linux/Nios II elf_prpsinfo */
1952 elf_tdata (abfd)->core->program
1953 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
1954 elf_tdata (abfd)->core->command
1955 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
1956 }
1957
1958 /* Note that for some reason, a spurious space is tacked
1959 onto the end of the args in some (at least one anyway)
1960 implementations, so strip it off if it exists. */
1961
1962 {
1963 char *command = elf_tdata (abfd)->core->command;
1964 int n = strlen (command);
1965
1966 if (0 < n && command[n - 1] == ' ')
1967 command[n - 1] = '\0';
1968 }
1969
1970 return true;
1971 }
1972
1973 /* Assorted hash table functions. */
1974
1975 /* Initialize an entry in the stub hash table. */
1976 static struct bfd_hash_entry *
1977 stub_hash_newfunc (struct bfd_hash_entry *entry,
1978 struct bfd_hash_table *table,
1979 const char *string)
1980 {
1981 /* Allocate the structure if it has not already been allocated by a
1982 subclass. */
1983 if (entry == NULL)
1984 {
1985 entry = bfd_hash_allocate (table,
1986 sizeof (struct elf32_nios2_stub_hash_entry));
1987 if (entry == NULL)
1988 return entry;
1989 }
1990
1991 /* Call the allocation method of the superclass. */
1992 entry = bfd_hash_newfunc (entry, table, string);
1993 if (entry != NULL)
1994 {
1995 struct elf32_nios2_stub_hash_entry *hsh;
1996
1997 /* Initialize the local fields. */
1998 hsh = (struct elf32_nios2_stub_hash_entry *) entry;
1999 hsh->stub_sec = NULL;
2000 hsh->stub_offset = 0;
2001 hsh->target_value = 0;
2002 hsh->target_section = NULL;
2003 hsh->stub_type = nios2_stub_none;
2004 hsh->hh = NULL;
2005 hsh->id_sec = NULL;
2006 }
2007
2008 return entry;
2009 }
2010
2011 /* Create an entry in a Nios II ELF linker hash table. */
2012 static struct bfd_hash_entry *
2013 link_hash_newfunc (struct bfd_hash_entry *entry,
2014 struct bfd_hash_table *table, const char *string)
2015 {
2016 /* Allocate the structure if it has not already been allocated by a
2017 subclass. */
2018 if (entry == NULL)
2019 {
2020 entry = bfd_hash_allocate (table,
2021 sizeof (struct elf32_nios2_link_hash_entry));
2022 if (entry == NULL)
2023 return entry;
2024 }
2025
2026 /* Call the allocation method of the superclass. */
2027 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
2028 if (entry)
2029 {
2030 struct elf32_nios2_link_hash_entry *eh;
2031
2032 eh = (struct elf32_nios2_link_hash_entry *) entry;
2033 eh->hsh_cache = NULL;
2034 eh->tls_type = GOT_UNKNOWN;
2035 eh->got_types_used = 0;
2036 }
2037
2038 return entry;
2039 }
2040
2041 /* Section name for stubs is the associated section name plus this
2042 string. */
2043 #define STUB_SUFFIX ".stub"
2044
2045 /* Build a name for an entry in the stub hash table. */
2046 static char *
2047 nios2_stub_name (const asection *input_section,
2048 const asection *sym_sec,
2049 const struct elf32_nios2_link_hash_entry *hh,
2050 const Elf_Internal_Rela *rel,
2051 enum elf32_nios2_stub_type stub_type)
2052 {
2053 char *stub_name;
2054 bfd_size_type len;
2055 char stubpos = (stub_type == nios2_stub_call26_before) ? 'b' : 'a';
2056
2057 if (hh)
2058 {
2059 len = 8 + 1 + 1 + 1+ strlen (hh->root.root.root.string) + 1 + 8 + 1;
2060 stub_name = bfd_malloc (len);
2061 if (stub_name != NULL)
2062 {
2063 sprintf (stub_name, "%08x_%c_%s+%x",
2064 input_section->id & 0xffffffff,
2065 stubpos,
2066 hh->root.root.root.string,
2067 (int) rel->r_addend & 0xffffffff);
2068 }
2069 }
2070 else
2071 {
2072 len = 8 + 1 + 1 + 1+ 8 + 1 + 8 + 1 + 8 + 1;
2073 stub_name = bfd_malloc (len);
2074 if (stub_name != NULL)
2075 {
2076 sprintf (stub_name, "%08x_%c_%x:%x+%x",
2077 input_section->id & 0xffffffff,
2078 stubpos,
2079 sym_sec->id & 0xffffffff,
2080 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff,
2081 (int) rel->r_addend & 0xffffffff);
2082 }
2083 }
2084 return stub_name;
2085 }
2086
2087 /* Look up an entry in the stub hash. Stub entries are cached because
2088 creating the stub name takes a bit of time. */
2089 static struct elf32_nios2_stub_hash_entry *
2090 nios2_get_stub_entry (const asection *input_section,
2091 const asection *sym_sec,
2092 struct elf32_nios2_link_hash_entry *hh,
2093 const Elf_Internal_Rela *rel,
2094 struct elf32_nios2_link_hash_table *htab,
2095 enum elf32_nios2_stub_type stub_type)
2096 {
2097 struct elf32_nios2_stub_hash_entry *hsh;
2098 const asection *id_sec;
2099
2100 /* If this input section is part of a group of sections sharing one
2101 stub section, then use the id of the first/last section in the group,
2102 depending on the stub section placement relative to the group.
2103 Stub names need to include a section id, as there may well be
2104 more than one stub used to reach say, printf, and we need to
2105 distinguish between them. */
2106 if (stub_type == nios2_stub_call26_before)
2107 id_sec = htab->stub_group[input_section->id].first_sec;
2108 else
2109 id_sec = htab->stub_group[input_section->id].last_sec;
2110
2111 if (hh != NULL && hh->hsh_cache != NULL
2112 && hh->hsh_cache->hh == hh
2113 && hh->hsh_cache->id_sec == id_sec
2114 && hh->hsh_cache->stub_type == stub_type)
2115 {
2116 hsh = hh->hsh_cache;
2117 }
2118 else
2119 {
2120 char *stub_name;
2121
2122 stub_name = nios2_stub_name (id_sec, sym_sec, hh, rel, stub_type);
2123 if (stub_name == NULL)
2124 return NULL;
2125
2126 hsh = nios2_stub_hash_lookup (&htab->bstab,
2127 stub_name, false, false);
2128
2129 if (hh != NULL)
2130 hh->hsh_cache = hsh;
2131
2132 free (stub_name);
2133 }
2134
2135 return hsh;
2136 }
2137
2138 /* Add a new stub entry to the stub hash. Not all fields of the new
2139 stub entry are initialised. */
2140 static struct elf32_nios2_stub_hash_entry *
2141 nios2_add_stub (const char *stub_name,
2142 asection *section,
2143 struct elf32_nios2_link_hash_table *htab,
2144 enum elf32_nios2_stub_type stub_type)
2145 {
2146 asection *link_sec;
2147 asection *stub_sec;
2148 asection **secptr, **linkptr;
2149 struct elf32_nios2_stub_hash_entry *hsh;
2150 bool afterp;
2151
2152 if (stub_type == nios2_stub_call26_before)
2153 {
2154 link_sec = htab->stub_group[section->id].first_sec;
2155 secptr = &(htab->stub_group[section->id].first_stub_sec);
2156 linkptr = &(htab->stub_group[link_sec->id].first_stub_sec);
2157 afterp = false;
2158 }
2159 else
2160 {
2161 link_sec = htab->stub_group[section->id].last_sec;
2162 secptr = &(htab->stub_group[section->id].last_stub_sec);
2163 linkptr = &(htab->stub_group[link_sec->id].last_stub_sec);
2164 afterp = true;
2165 }
2166 stub_sec = *secptr;
2167 if (stub_sec == NULL)
2168 {
2169 stub_sec = *linkptr;
2170 if (stub_sec == NULL)
2171 {
2172 size_t namelen;
2173 bfd_size_type len;
2174 char *s_name;
2175
2176 namelen = strlen (link_sec->name);
2177 len = namelen + sizeof (STUB_SUFFIX);
2178 s_name = bfd_alloc (htab->stub_bfd, len);
2179 if (s_name == NULL)
2180 return NULL;
2181
2182 memcpy (s_name, link_sec->name, namelen);
2183 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
2184
2185 stub_sec = (*htab->add_stub_section) (s_name, link_sec, afterp);
2186 if (stub_sec == NULL)
2187 return NULL;
2188 *linkptr = stub_sec;
2189 }
2190 *secptr = stub_sec;
2191 }
2192
2193 /* Enter this entry into the linker stub hash table. */
2194 hsh = nios2_stub_hash_lookup (&htab->bstab, stub_name,
2195 true, false);
2196 if (hsh == NULL)
2197 {
2198 /* xgettext:c-format */
2199 _bfd_error_handler (_("%pB: cannot create stub entry %s"),
2200 section->owner,
2201 stub_name);
2202 return NULL;
2203 }
2204
2205 hsh->stub_sec = stub_sec;
2206 hsh->stub_offset = 0;
2207 hsh->id_sec = link_sec;
2208 return hsh;
2209 }
2210
2211 /* Set up various things so that we can make a list of input sections
2212 for each output section included in the link. Returns -1 on error,
2213 0 when no stubs will be needed, and 1 on success. */
2214 int
2215 nios2_elf32_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info)
2216 {
2217 bfd *input_bfd;
2218 unsigned int bfd_count;
2219 unsigned int top_id, top_index;
2220 asection *section;
2221 asection **input_list, **list;
2222 size_t amt;
2223 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2224
2225 /* Count the number of input BFDs and find the top input section id. */
2226 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
2227 input_bfd != NULL;
2228 input_bfd = input_bfd->link.next)
2229 {
2230 bfd_count += 1;
2231 for (section = input_bfd->sections;
2232 section != NULL;
2233 section = section->next)
2234 {
2235 if (top_id < section->id)
2236 top_id = section->id;
2237 }
2238 }
2239
2240 htab->bfd_count = bfd_count;
2241
2242 amt = sizeof (struct map_stub) * (top_id + 1);
2243 htab->stub_group = bfd_zmalloc (amt);
2244 if (htab->stub_group == NULL)
2245 return -1;
2246
2247 /* We can't use output_bfd->section_count here to find the top output
2248 section index as some sections may have been removed, and
2249 strip_excluded_output_sections doesn't renumber the indices. */
2250 for (section = output_bfd->sections, top_index = 0;
2251 section != NULL;
2252 section = section->next)
2253 {
2254 if (top_index < section->index)
2255 top_index = section->index;
2256 }
2257
2258 htab->top_index = top_index;
2259 amt = sizeof (asection *) * (top_index + 1);
2260 input_list = bfd_malloc (amt);
2261 htab->input_list = input_list;
2262 if (input_list == NULL)
2263 return -1;
2264
2265 /* For sections we aren't interested in, mark their entries with a
2266 value we can check later. */
2267 list = input_list + top_index;
2268 do
2269 *list = bfd_abs_section_ptr;
2270 while (list-- != input_list);
2271
2272 for (section = output_bfd->sections;
2273 section != NULL;
2274 section = section->next)
2275 {
2276 /* FIXME: This is a bit of hack. Currently our .ctors and .dtors
2277 * have PC relative relocs in them but no code flag set. */
2278 if (((section->flags & SEC_CODE) != 0) ||
2279 strcmp(".ctors", section->name) ||
2280 strcmp(".dtors", section->name))
2281 input_list[section->index] = NULL;
2282 }
2283
2284 return 1;
2285 }
2286
2287 /* The linker repeatedly calls this function for each input section,
2288 in the order that input sections are linked into output sections.
2289 Build lists of input sections to determine groupings between which
2290 we may insert linker stubs. */
2291 void
2292 nios2_elf32_next_input_section (struct bfd_link_info *info, asection *isec)
2293 {
2294 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2295
2296 if (isec->output_section->index <= htab->top_index)
2297 {
2298 asection **list = htab->input_list + isec->output_section->index;
2299 if (*list != bfd_abs_section_ptr)
2300 {
2301 /* Steal the last_sec pointer for our list.
2302 This happens to make the list in reverse order,
2303 which is what we want. */
2304 htab->stub_group[isec->id].last_sec = *list;
2305 *list = isec;
2306 }
2307 }
2308 }
2309
2310 /* Segment mask for CALL26 relocation relaxation. */
2311 #define CALL26_SEGMENT(x) ((x) & 0xf0000000)
2312
2313 /* Fudge factor for approximate maximum size of all stubs that might
2314 be inserted by the linker. This does not actually limit the number
2315 of stubs that might be inserted, and only affects strategy for grouping
2316 and placement of stubs. Perhaps this should be computed based on number
2317 of relocations seen, or be specifiable on the command line. */
2318 #define MAX_STUB_SECTION_SIZE 0xffff
2319
2320 /* See whether we can group stub sections together. Grouping stub
2321 sections may result in fewer stubs. More importantly, we need to
2322 put all .init* and .fini* stubs at the end of the .init or
2323 .fini output sections respectively, because glibc splits the
2324 _init and _fini functions into multiple parts. Putting a stub in
2325 the middle of a function is not a good idea.
2326 Rather than computing groups of a maximum fixed size, for Nios II
2327 CALL26 relaxation it makes more sense to compute the groups based on
2328 sections that fit within a 256MB address segment. Also do not allow
2329 a group to span more than one output section, since different output
2330 sections might correspond to different memory banks on a bare-metal
2331 target, etc. */
2332 static void
2333 group_sections (struct elf32_nios2_link_hash_table *htab)
2334 {
2335 asection **list = htab->input_list + htab->top_index;
2336 do
2337 {
2338 /* The list is in reverse order so we'll search backwards looking
2339 for the first section that begins in the same memory segment,
2340 marking sections along the way to point at the tail for this
2341 group. */
2342 asection *tail = *list;
2343 if (tail == bfd_abs_section_ptr)
2344 continue;
2345 while (tail != NULL)
2346 {
2347 bfd_vma start = tail->output_section->vma + tail->output_offset;
2348 bfd_vma end = start + tail->size;
2349 bfd_vma segment = CALL26_SEGMENT (end);
2350 asection *prev;
2351
2352 if (segment != CALL26_SEGMENT (start)
2353 || segment != CALL26_SEGMENT (end + MAX_STUB_SECTION_SIZE))
2354 /* This section spans more than one memory segment, or is
2355 close enough to the end of the segment that adding stub
2356 sections before it might cause it to move so that it
2357 spans memory segments, or that stubs added at the end of
2358 this group might overflow into the next memory segment.
2359 Put it in a group by itself to localize the effects. */
2360 {
2361 prev = htab->stub_group[tail->id].last_sec;
2362 htab->stub_group[tail->id].last_sec = tail;
2363 htab->stub_group[tail->id].first_sec = tail;
2364 }
2365 else
2366 /* Collect more sections for this group. */
2367 {
2368 asection *curr, *first;
2369 for (curr = tail; ; curr = prev)
2370 {
2371 prev = htab->stub_group[curr->id].last_sec;
2372 if (!prev
2373 || tail->output_section != prev->output_section
2374 || (CALL26_SEGMENT (prev->output_section->vma
2375 + prev->output_offset)
2376 != segment))
2377 break;
2378 }
2379 first = curr;
2380 for (curr = tail; ; curr = prev)
2381 {
2382 prev = htab->stub_group[curr->id].last_sec;
2383 htab->stub_group[curr->id].last_sec = tail;
2384 htab->stub_group[curr->id].first_sec = first;
2385 if (curr == first)
2386 break;
2387 }
2388 }
2389
2390 /* Reset tail for the next group. */
2391 tail = prev;
2392 }
2393 }
2394 while (list-- != htab->input_list);
2395 free (htab->input_list);
2396 }
2397
2398 /* Determine the type of stub needed, if any, for a call. */
2399 static enum elf32_nios2_stub_type
2400 nios2_type_of_stub (asection *input_sec,
2401 const Elf_Internal_Rela *rel,
2402 struct elf32_nios2_link_hash_entry *hh,
2403 struct elf32_nios2_link_hash_table *htab,
2404 bfd_vma destination,
2405 struct bfd_link_info *info ATTRIBUTE_UNUSED)
2406 {
2407 bfd_vma location, segment, start, end;
2408 asection *s0, *s1, *s;
2409
2410 if (hh != NULL &&
2411 !(hh->root.root.type == bfd_link_hash_defined
2412 || hh->root.root.type == bfd_link_hash_defweak))
2413 return nios2_stub_none;
2414
2415 /* Determine where the call point is. */
2416 location = (input_sec->output_section->vma
2417 + input_sec->output_offset + rel->r_offset);
2418 segment = CALL26_SEGMENT (location);
2419
2420 /* Nios II CALL and JMPI instructions can transfer control to addresses
2421 within the same 256MB segment as the PC. */
2422 if (segment == CALL26_SEGMENT (destination))
2423 return nios2_stub_none;
2424
2425 /* Find the start and end addresses of the stub group. Also account for
2426 any already-created stub sections for this group. Note that for stubs
2427 in the end section, only the first instruction of the last stub
2428 (12 bytes long) needs to be within range. */
2429 s0 = htab->stub_group[input_sec->id].first_sec;
2430 s = htab->stub_group[s0->id].first_stub_sec;
2431 if (s != NULL && s->size > 0)
2432 start = s->output_section->vma + s->output_offset;
2433 else
2434 start = s0->output_section->vma + s0->output_offset;
2435
2436 s1 = htab->stub_group[input_sec->id].last_sec;
2437 s = htab->stub_group[s1->id].last_stub_sec;
2438 if (s != NULL && s->size > 0)
2439 end = s->output_section->vma + s->output_offset + s->size - 8;
2440 else
2441 end = s1->output_section->vma + s1->output_offset + s1->size;
2442
2443 BFD_ASSERT (start < end);
2444 BFD_ASSERT (start <= location);
2445 BFD_ASSERT (location < end);
2446
2447 /* Put stubs at the end of the group unless that is not a valid
2448 location and the beginning of the group is. It might be that
2449 neither the beginning nor end works if we have an input section
2450 so large that it spans multiple segment boundaries. In that
2451 case, punt; the end result will be a relocation overflow error no
2452 matter what we do here.
2453
2454 Note that adding stubs pushes up the addresses of all subsequent
2455 sections, so that stubs allocated on one pass through the
2456 relaxation loop may not be valid on the next pass. (E.g., we may
2457 allocate a stub at the beginning of the section on one pass and
2458 find that the call site has been bumped into the next memory
2459 segment on the next pass.) The important thing to note is that
2460 we never try to reclaim the space allocated to such unused stubs,
2461 so code size and section addresses can only increase with each
2462 iteration. Accounting for the start and end addresses of the
2463 already-created stub sections ensures that when the algorithm
2464 converges, it converges accurately, with the entire appropriate
2465 stub section accessible from the call site and not just the
2466 address at the start or end of the stub group proper. */
2467
2468 if (segment == CALL26_SEGMENT (end))
2469 return nios2_stub_call26_after;
2470 else if (segment == CALL26_SEGMENT (start))
2471 return nios2_stub_call26_before;
2472 else
2473 /* Perhaps this should be a dedicated error code. */
2474 return nios2_stub_none;
2475 }
2476
2477 static bool
2478 nios2_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
2479 {
2480 struct elf32_nios2_stub_hash_entry *hsh
2481 = (struct elf32_nios2_stub_hash_entry *) gen_entry;
2482 asection *stub_sec = hsh->stub_sec;
2483 bfd_vma sym_value;
2484 struct bfd_link_info *info;
2485
2486 info = (struct bfd_link_info *) in_arg;
2487
2488 /* Fail if the target section could not be assigned to an output
2489 section. The user should fix his linker script. */
2490 if (hsh->target_section->output_section == NULL
2491 && info->non_contiguous_regions)
2492 info->callbacks->einfo (_("%F%P: Could not assign `%pA' to an output section. "
2493 "Retry without --enable-non-contiguous-regions.\n"),
2494 hsh->target_section);
2495
2496 /* Make a note of the offset within the stubs for this entry. */
2497 hsh->stub_offset = stub_sec->size;
2498
2499 switch (hsh->stub_type)
2500 {
2501 case nios2_stub_call26_before:
2502 case nios2_stub_call26_after:
2503 /* A call26 stub looks like:
2504 orhi at, %hiadj(dest)
2505 addi at, at, %lo(dest)
2506 jmp at
2507 Note that call/jmpi instructions can't be used in PIC code
2508 so there is no reason for the stub to be PIC, either. */
2509 sym_value = (hsh->target_value
2510 + hsh->target_section->output_offset
2511 + hsh->target_section->output_section->vma
2512 + hsh->addend);
2513
2514 nios2_elf32_install_data (stub_sec, nios2_call26_stub_entry,
2515 hsh->stub_offset, 3);
2516 nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset,
2517 hiadj (sym_value));
2518 nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset + 4,
2519 sym_value);
2520 stub_sec->size += 12;
2521 break;
2522 default:
2523 BFD_FAIL ();
2524 return false;
2525 }
2526
2527 return true;
2528 }
2529
2530 /* As above, but don't actually build the stub. Just bump offset so
2531 we know stub section sizes. */
2532 static bool
2533 nios2_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
2534 {
2535 struct elf32_nios2_stub_hash_entry *hsh
2536 = (struct elf32_nios2_stub_hash_entry *) gen_entry;
2537
2538 switch (hsh->stub_type)
2539 {
2540 case nios2_stub_call26_before:
2541 case nios2_stub_call26_after:
2542 hsh->stub_sec->size += 12;
2543 break;
2544 default:
2545 BFD_FAIL ();
2546 return false;
2547 }
2548 return true;
2549 }
2550
2551 /* Read in all local syms for all input bfds.
2552 Returns -1 on error, 0 otherwise. */
2553
2554 static int
2555 get_local_syms (bfd *output_bfd ATTRIBUTE_UNUSED, bfd *input_bfd,
2556 struct bfd_link_info *info)
2557 {
2558 unsigned int bfd_indx;
2559 Elf_Internal_Sym *local_syms, **all_local_syms;
2560 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2561
2562 /* We want to read in symbol extension records only once. To do this
2563 we need to read in the local symbols in parallel and save them for
2564 later use; so hold pointers to the local symbols in an array. */
2565 size_t amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
2566 all_local_syms = bfd_zmalloc (amt);
2567 htab->all_local_syms = all_local_syms;
2568 if (all_local_syms == NULL)
2569 return -1;
2570
2571 /* Walk over all the input BFDs, swapping in local symbols. */
2572 for (bfd_indx = 0;
2573 input_bfd != NULL;
2574 input_bfd = input_bfd->link.next, bfd_indx++)
2575 {
2576 Elf_Internal_Shdr *symtab_hdr;
2577
2578 /* We'll need the symbol table in a second. */
2579 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2580 if (symtab_hdr->sh_info == 0)
2581 continue;
2582
2583 /* We need an array of the local symbols attached to the input bfd. */
2584 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
2585 if (local_syms == NULL)
2586 {
2587 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
2588 symtab_hdr->sh_info, 0,
2589 NULL, NULL, NULL);
2590 /* Cache them for elf_link_input_bfd. */
2591 symtab_hdr->contents = (unsigned char *) local_syms;
2592 }
2593 if (local_syms == NULL)
2594 return -1;
2595
2596 all_local_syms[bfd_indx] = local_syms;
2597 }
2598
2599 return 0;
2600 }
2601
2602 /* Determine and set the size of the stub section for a final link. */
2603 bool
2604 nios2_elf32_size_stubs (bfd *output_bfd, bfd *stub_bfd,
2605 struct bfd_link_info *info,
2606 asection *(*add_stub_section) (const char *,
2607 asection *, bool),
2608 void (*layout_sections_again) (void))
2609 {
2610 bool stub_changed = false;
2611 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2612
2613 /* Stash our params away. */
2614 htab->stub_bfd = stub_bfd;
2615 htab->add_stub_section = add_stub_section;
2616 htab->layout_sections_again = layout_sections_again;
2617
2618 /* FIXME: We only compute the section groups once. This could cause
2619 problems if adding a large stub section causes following sections,
2620 or parts of them, to move into another segment. However, this seems
2621 to be consistent with the way other back ends handle this.... */
2622 group_sections (htab);
2623
2624 if (get_local_syms (output_bfd, info->input_bfds, info))
2625 {
2626 if (htab->all_local_syms)
2627 goto error_ret_free_local;
2628 return false;
2629 }
2630
2631 while (1)
2632 {
2633 bfd *input_bfd;
2634 unsigned int bfd_indx;
2635 asection *stub_sec;
2636
2637 for (input_bfd = info->input_bfds, bfd_indx = 0;
2638 input_bfd != NULL;
2639 input_bfd = input_bfd->link.next, bfd_indx++)
2640 {
2641 Elf_Internal_Shdr *symtab_hdr;
2642 asection *section;
2643 Elf_Internal_Sym *local_syms;
2644
2645 /* We'll need the symbol table in a second. */
2646 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2647 if (symtab_hdr->sh_info == 0)
2648 continue;
2649
2650 local_syms = htab->all_local_syms[bfd_indx];
2651
2652 /* Walk over each section attached to the input bfd. */
2653 for (section = input_bfd->sections;
2654 section != NULL;
2655 section = section->next)
2656 {
2657 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
2658
2659 /* If there aren't any relocs, then there's nothing more
2660 to do. */
2661 if ((section->flags & SEC_RELOC) == 0
2662 || section->reloc_count == 0)
2663 continue;
2664
2665 /* If this section is a link-once section that will be
2666 discarded, then don't create any stubs. */
2667 if (section->output_section == NULL
2668 || section->output_section->owner != output_bfd)
2669 continue;
2670
2671 /* Get the relocs. */
2672 internal_relocs
2673 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
2674 info->keep_memory);
2675 if (internal_relocs == NULL)
2676 goto error_ret_free_local;
2677
2678 /* Now examine each relocation. */
2679 irela = internal_relocs;
2680 irelaend = irela + section->reloc_count;
2681 for (; irela < irelaend; irela++)
2682 {
2683 unsigned int r_type, r_indx;
2684 enum elf32_nios2_stub_type stub_type;
2685 struct elf32_nios2_stub_hash_entry *hsh;
2686 asection *sym_sec;
2687 bfd_vma sym_value;
2688 bfd_vma destination;
2689 struct elf32_nios2_link_hash_entry *hh;
2690 char *stub_name;
2691 const asection *id_sec;
2692
2693 r_type = ELF32_R_TYPE (irela->r_info);
2694 r_indx = ELF32_R_SYM (irela->r_info);
2695
2696 if (r_type >= (unsigned int) R_NIOS2_ILLEGAL)
2697 {
2698 bfd_set_error (bfd_error_bad_value);
2699 error_ret_free_internal:
2700 if (elf_section_data (section)->relocs == NULL)
2701 free (internal_relocs);
2702 goto error_ret_free_local;
2703 }
2704
2705 /* Only look for stubs on CALL and JMPI instructions. */
2706 if (r_type != (unsigned int) R_NIOS2_CALL26)
2707 continue;
2708
2709 /* Now determine the call target, its name, value,
2710 section. */
2711 sym_sec = NULL;
2712 sym_value = 0;
2713 destination = 0;
2714 hh = NULL;
2715 if (r_indx < symtab_hdr->sh_info)
2716 {
2717 /* It's a local symbol. */
2718 Elf_Internal_Sym *sym;
2719 Elf_Internal_Shdr *hdr;
2720 unsigned int shndx;
2721
2722 sym = local_syms + r_indx;
2723 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2724 sym_value = sym->st_value;
2725 shndx = sym->st_shndx;
2726 if (shndx < elf_numsections (input_bfd))
2727 {
2728 hdr = elf_elfsections (input_bfd)[shndx];
2729 sym_sec = hdr->bfd_section;
2730 destination = (sym_value + irela->r_addend
2731 + sym_sec->output_offset
2732 + sym_sec->output_section->vma);
2733 }
2734 }
2735 else
2736 {
2737 /* It's an external symbol. */
2738 int e_indx;
2739
2740 e_indx = r_indx - symtab_hdr->sh_info;
2741 hh = ((struct elf32_nios2_link_hash_entry *)
2742 elf_sym_hashes (input_bfd)[e_indx]);
2743
2744 while (hh->root.root.type == bfd_link_hash_indirect
2745 || hh->root.root.type == bfd_link_hash_warning)
2746 hh = ((struct elf32_nios2_link_hash_entry *)
2747 hh->root.root.u.i.link);
2748
2749 if (hh->root.root.type == bfd_link_hash_defined
2750 || hh->root.root.type == bfd_link_hash_defweak)
2751 {
2752 sym_sec = hh->root.root.u.def.section;
2753 sym_value = hh->root.root.u.def.value;
2754
2755 if (sym_sec->output_section != NULL)
2756 destination = (sym_value + irela->r_addend
2757 + sym_sec->output_offset
2758 + sym_sec->output_section->vma);
2759 else
2760 continue;
2761 }
2762 else if (hh->root.root.type == bfd_link_hash_undefweak)
2763 {
2764 if (! bfd_link_pic (info))
2765 continue;
2766 }
2767 else if (hh->root.root.type == bfd_link_hash_undefined)
2768 {
2769 if (! (info->unresolved_syms_in_objects == RM_IGNORE
2770 && (ELF_ST_VISIBILITY (hh->root.other)
2771 == STV_DEFAULT)))
2772 continue;
2773 }
2774 else
2775 {
2776 bfd_set_error (bfd_error_bad_value);
2777 goto error_ret_free_internal;
2778 }
2779 }
2780
2781 /* Determine what (if any) linker stub is needed. */
2782 stub_type = nios2_type_of_stub (section, irela, hh, htab,
2783 destination, info);
2784 if (stub_type == nios2_stub_none)
2785 continue;
2786
2787 /* Support for grouping stub sections. */
2788 if (stub_type == nios2_stub_call26_before)
2789 id_sec = htab->stub_group[section->id].first_sec;
2790 else
2791 id_sec = htab->stub_group[section->id].last_sec;
2792
2793 /* Get the name of this stub. */
2794 stub_name = nios2_stub_name (id_sec, sym_sec, hh, irela,
2795 stub_type);
2796 if (!stub_name)
2797 goto error_ret_free_internal;
2798
2799 hsh = nios2_stub_hash_lookup (&htab->bstab,
2800 stub_name,
2801 false, false);
2802 if (hsh != NULL)
2803 {
2804 /* The proper stub has already been created. */
2805 free (stub_name);
2806 continue;
2807 }
2808
2809 hsh = nios2_add_stub (stub_name, section, htab, stub_type);
2810 if (hsh == NULL)
2811 {
2812 free (stub_name);
2813 goto error_ret_free_internal;
2814 }
2815 hsh->target_value = sym_value;
2816 hsh->target_section = sym_sec;
2817 hsh->stub_type = stub_type;
2818 hsh->hh = hh;
2819 hsh->addend = irela->r_addend;
2820 stub_changed = true;
2821 }
2822
2823 /* We're done with the internal relocs, free them. */
2824 if (elf_section_data (section)->relocs == NULL)
2825 free (internal_relocs);
2826 }
2827 }
2828
2829 if (!stub_changed)
2830 break;
2831
2832 /* OK, we've added some stubs. Find out the new size of the
2833 stub sections. */
2834 for (stub_sec = htab->stub_bfd->sections;
2835 stub_sec != NULL;
2836 stub_sec = stub_sec->next)
2837 stub_sec->size = 0;
2838
2839 bfd_hash_traverse (&htab->bstab, nios2_size_one_stub, htab);
2840
2841 /* Ask the linker to do its stuff. */
2842 (*htab->layout_sections_again) ();
2843 stub_changed = false;
2844 }
2845
2846 free (htab->all_local_syms);
2847 return true;
2848
2849 error_ret_free_local:
2850 free (htab->all_local_syms);
2851 return false;
2852 }
2853
2854 /* Build all the stubs associated with the current output file. The
2855 stubs are kept in a hash table attached to the main linker hash
2856 table. This function is called via nios2elf_finish in the linker. */
2857 bool
2858 nios2_elf32_build_stubs (struct bfd_link_info *info)
2859 {
2860 asection *stub_sec;
2861 struct bfd_hash_table *table;
2862 struct elf32_nios2_link_hash_table *htab;
2863
2864 htab = elf32_nios2_hash_table (info);
2865
2866 for (stub_sec = htab->stub_bfd->sections;
2867 stub_sec != NULL;
2868 stub_sec = stub_sec->next)
2869 /* The stub_bfd may contain non-stub sections if it is also the
2870 dynobj. Any such non-stub sections are created with the
2871 SEC_LINKER_CREATED flag set, while stub sections do not
2872 have that flag. Ignore any non-stub sections here. */
2873 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
2874 {
2875 bfd_size_type size;
2876
2877 /* Allocate memory to hold the linker stubs. */
2878 size = stub_sec->size;
2879 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
2880 if (stub_sec->contents == NULL && size != 0)
2881 return false;
2882 stub_sec->size = 0;
2883 }
2884
2885 /* Build the stubs as directed by the stub hash table. */
2886 table = &htab->bstab;
2887 bfd_hash_traverse (table, nios2_build_one_stub, info);
2888
2889 return true;
2890 }
2891
2892
2893 #define is_nios2_elf(bfd) \
2894 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
2895 && elf_object_id (bfd) == NIOS2_ELF_DATA)
2896
2897 /* Merge backend specific data from an object file to the output
2898 object file when linking. */
2899
2900 static bool
2901 nios2_elf32_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
2902 {
2903 bfd *obfd = info->output_bfd;
2904 flagword old_flags;
2905 flagword new_flags;
2906
2907 if (!is_nios2_elf (ibfd) || !is_nios2_elf (obfd))
2908 return true;
2909
2910 /* Check if we have the same endianness. */
2911 if (! _bfd_generic_verify_endian_match (ibfd, info))
2912 return false;
2913
2914 new_flags = elf_elfheader (ibfd)->e_flags;
2915 old_flags = elf_elfheader (obfd)->e_flags;
2916 if (!elf_flags_init (obfd))
2917 {
2918 /* First call, no flags set. */
2919 elf_flags_init (obfd) = true;
2920 elf_elfheader (obfd)->e_flags = new_flags;
2921
2922 switch (new_flags)
2923 {
2924 default:
2925 case EF_NIOS2_ARCH_R1:
2926 bfd_default_set_arch_mach (obfd, bfd_arch_nios2, bfd_mach_nios2r1);
2927 break;
2928 case EF_NIOS2_ARCH_R2:
2929 if (bfd_big_endian (ibfd))
2930 {
2931 _bfd_error_handler
2932 (_("error: %pB: big-endian R2 is not supported"), ibfd);
2933 bfd_set_error (bfd_error_bad_value);
2934 return false;
2935 }
2936 bfd_default_set_arch_mach (obfd, bfd_arch_nios2, bfd_mach_nios2r2);
2937 break;
2938 }
2939 }
2940
2941 /* Incompatible flags. */
2942 else if (new_flags != old_flags)
2943 {
2944 /* So far, the only incompatible flags denote incompatible
2945 architectures. */
2946 _bfd_error_handler
2947 /* xgettext:c-format */
2948 (_("error: %pB: conflicting CPU architectures %d/%d"),
2949 ibfd, new_flags, old_flags);
2950 bfd_set_error (bfd_error_bad_value);
2951 return false;
2952 }
2953
2954 /* Merge Tag_compatibility attributes and any common GNU ones. */
2955 _bfd_elf_merge_object_attributes (ibfd, info);
2956
2957 return true;
2958 }
2959
2960 /* Implement bfd_elf32_bfd_reloc_type_lookup:
2961 Given a BFD reloc type, return a howto structure. */
2962
2963 static reloc_howto_type *
2964 nios2_elf32_bfd_reloc_type_lookup (bfd *abfd,
2965 bfd_reloc_code_real_type code)
2966 {
2967 int i;
2968
2969 for (i = 0; i < (int) ARRAY_SIZE (nios2_reloc_map); ++i)
2970 if (nios2_reloc_map[i].bfd_val == code)
2971 return lookup_howto (nios2_reloc_map[i].elf_val, abfd);
2972 return NULL;
2973 }
2974
2975 /* Implement bfd_elf32_bfd_reloc_name_lookup:
2976 Given a reloc name, return a howto structure. */
2977
2978 static reloc_howto_type *
2979 nios2_elf32_bfd_reloc_name_lookup (bfd *abfd,
2980 const char *r_name)
2981 {
2982 int i;
2983 reloc_howto_type *howto_tbl;
2984 int howto_tbl_size;
2985
2986 if (BFD_IS_R2 (abfd))
2987 {
2988 howto_tbl = elf_nios2_r2_howto_table_rel;
2989 howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r2_howto_table_rel);
2990 }
2991 else
2992 {
2993 howto_tbl = elf_nios2_r1_howto_table_rel;
2994 howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r1_howto_table_rel);
2995 }
2996
2997 for (i = 0; i < howto_tbl_size; i++)
2998 if (howto_tbl[i].name && strcasecmp (howto_tbl[i].name, r_name) == 0)
2999 return howto_tbl + i;
3000
3001 return NULL;
3002 }
3003
3004 /* Implement elf_info_to_howto:
3005 Given a ELF32 relocation, fill in a arelent structure. */
3006
3007 static bool
3008 nios2_elf32_info_to_howto (bfd *abfd, arelent *cache_ptr,
3009 Elf_Internal_Rela *dst)
3010 {
3011 unsigned int r_type;
3012
3013 r_type = ELF32_R_TYPE (dst->r_info);
3014 if ((cache_ptr->howto = lookup_howto (r_type, abfd)) == NULL)
3015 {
3016 /* xgettext:c-format */
3017 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
3018 abfd, r_type);
3019 bfd_set_error (bfd_error_bad_value);
3020 return false;
3021 }
3022 return true;
3023 }
3024
3025 /* Return the base VMA address which should be subtracted from real addresses
3026 when resolving @dtpoff relocation.
3027 This is PT_TLS segment p_vaddr. */
3028 static bfd_vma
3029 dtpoff_base (struct bfd_link_info *info)
3030 {
3031 /* If tls_sec is NULL, we should have signalled an error already. */
3032 if (elf_hash_table (info)->tls_sec == NULL)
3033 return 0;
3034 return elf_hash_table (info)->tls_sec->vma;
3035 }
3036
3037 /* Return the relocation value for @tpoff relocation
3038 if STT_TLS virtual address is ADDRESS. */
3039 static bfd_vma
3040 tpoff (struct bfd_link_info *info, bfd_vma address)
3041 {
3042 struct elf_link_hash_table *htab = elf_hash_table (info);
3043
3044 /* If tls_sec is NULL, we should have signalled an error already. */
3045 if (htab->tls_sec == NULL)
3046 return 0;
3047 return address - htab->tls_sec->vma;
3048 }
3049
3050 /* Set the GP value for OUTPUT_BFD. Returns FALSE if this is a
3051 dangerous relocation. */
3052 static bool
3053 nios2_elf_assign_gp (bfd *output_bfd, bfd_vma *pgp, struct bfd_link_info *info)
3054 {
3055
3056 bool gp_found;
3057 struct bfd_hash_entry *h;
3058 struct bfd_link_hash_entry *lh;
3059
3060 /* If we've already figured out what GP will be, just return it. */
3061 *pgp = _bfd_get_gp_value (output_bfd);
3062 if (*pgp)
3063 return true;
3064
3065 h = bfd_hash_lookup (&info->hash->table, "_gp", false, false);
3066 lh = (struct bfd_link_hash_entry *) h;
3067 lookup:
3068 if (lh)
3069 {
3070 switch (lh->type)
3071 {
3072 case bfd_link_hash_undefined:
3073 case bfd_link_hash_undefweak:
3074 case bfd_link_hash_common:
3075 gp_found = false;
3076 break;
3077 case bfd_link_hash_defined:
3078 case bfd_link_hash_defweak:
3079 gp_found = true;
3080 {
3081 asection *sym_sec = lh->u.def.section;
3082 bfd_vma sym_value = lh->u.def.value;
3083
3084 if (sym_sec->output_section)
3085 sym_value = (sym_value + sym_sec->output_offset
3086 + sym_sec->output_section->vma);
3087 *pgp = sym_value;
3088 }
3089 break;
3090 case bfd_link_hash_indirect:
3091 case bfd_link_hash_warning:
3092 lh = lh->u.i.link;
3093 /* @@FIXME ignoring warning for now */
3094 goto lookup;
3095 case bfd_link_hash_new:
3096 default:
3097 abort ();
3098 }
3099 }
3100 else
3101 gp_found = false;
3102
3103 if (!gp_found)
3104 {
3105 /* Only get the error once. */
3106 *pgp = 4;
3107 _bfd_set_gp_value (output_bfd, *pgp);
3108 return false;
3109 }
3110
3111 _bfd_set_gp_value (output_bfd, *pgp);
3112
3113 return true;
3114 }
3115
3116 /* Retrieve the previously cached _gp pointer, returning bfd_reloc_dangerous
3117 if it's not available as we don't have a link_info pointer available here
3118 to look it up in the output symbol table. We don't need to adjust the
3119 symbol value for an external symbol if we are producing relocatable
3120 output. */
3121 static bfd_reloc_status_type
3122 nios2_elf_final_gp (bfd *output_bfd, asymbol *symbol, bool relocatable,
3123 char **error_message, bfd_vma *pgp)
3124 {
3125 if (bfd_is_und_section (symbol->section) && !relocatable)
3126 {
3127 *pgp = 0;
3128 return bfd_reloc_undefined;
3129 }
3130
3131 *pgp = _bfd_get_gp_value (output_bfd);
3132 if (*pgp == 0 && (!relocatable || (symbol->flags & BSF_SECTION_SYM) != 0))
3133 {
3134 if (relocatable)
3135 {
3136 /* Make up a value. */
3137 *pgp = symbol->section->output_section->vma + 0x4000;
3138 _bfd_set_gp_value (output_bfd, *pgp);
3139 }
3140 else
3141 {
3142 *error_message
3143 = (char *) _("global pointer relative relocation when _gp not defined");
3144 return bfd_reloc_dangerous;
3145 }
3146 }
3147
3148 return bfd_reloc_ok;
3149 }
3150
3151 /* Do the relocations that require special handling. */
3152 static bfd_reloc_status_type
3153 nios2_elf32_do_hi16_relocate (bfd *abfd, reloc_howto_type *howto,
3154 asection *input_section,
3155 bfd_byte *data, bfd_vma offset,
3156 bfd_vma symbol_value, bfd_vma addend)
3157 {
3158 symbol_value = symbol_value + addend;
3159 addend = 0;
3160 symbol_value = (symbol_value >> 16) & 0xffff;
3161 return _bfd_final_link_relocate (howto, abfd, input_section,
3162 data, offset, symbol_value, addend);
3163 }
3164
3165 static bfd_reloc_status_type
3166 nios2_elf32_do_lo16_relocate (bfd *abfd, reloc_howto_type *howto,
3167 asection *input_section,
3168 bfd_byte *data, bfd_vma offset,
3169 bfd_vma symbol_value, bfd_vma addend)
3170 {
3171 symbol_value = symbol_value + addend;
3172 addend = 0;
3173 symbol_value = symbol_value & 0xffff;
3174 return _bfd_final_link_relocate (howto, abfd, input_section,
3175 data, offset, symbol_value, addend);
3176 }
3177
3178 static bfd_reloc_status_type
3179 nios2_elf32_do_hiadj16_relocate (bfd *abfd, reloc_howto_type *howto,
3180 asection *input_section,
3181 bfd_byte *data, bfd_vma offset,
3182 bfd_vma symbol_value, bfd_vma addend)
3183 {
3184 symbol_value = symbol_value + addend;
3185 addend = 0;
3186 symbol_value = hiadj(symbol_value);
3187 return _bfd_final_link_relocate (howto, abfd, input_section, data, offset,
3188 symbol_value, addend);
3189 }
3190
3191 static bfd_reloc_status_type
3192 nios2_elf32_do_pcrel_lo16_relocate (bfd *abfd, reloc_howto_type *howto,
3193 asection *input_section,
3194 bfd_byte *data, bfd_vma offset,
3195 bfd_vma symbol_value, bfd_vma addend)
3196 {
3197 symbol_value = symbol_value + addend;
3198 addend = 0;
3199 symbol_value = symbol_value & 0xffff;
3200 return _bfd_final_link_relocate (howto, abfd, input_section,
3201 data, offset, symbol_value, addend);
3202 }
3203
3204 static bfd_reloc_status_type
3205 nios2_elf32_do_pcrel_hiadj16_relocate (bfd *abfd, reloc_howto_type *howto,
3206 asection *input_section,
3207 bfd_byte *data, bfd_vma offset,
3208 bfd_vma symbol_value, bfd_vma addend)
3209 {
3210 symbol_value = symbol_value + addend;
3211 symbol_value -= (input_section->output_section->vma
3212 + input_section->output_offset);
3213 symbol_value -= offset;
3214 addend = 0;
3215 symbol_value = hiadj(symbol_value);
3216 return _bfd_final_link_relocate (howto, abfd, input_section, data, offset,
3217 symbol_value, addend);
3218 }
3219
3220 static bfd_reloc_status_type
3221 nios2_elf32_do_pcrel16_relocate (bfd *abfd, reloc_howto_type *howto,
3222 asection *input_section,
3223 bfd_byte *data, bfd_vma offset,
3224 bfd_vma symbol_value, bfd_vma addend)
3225 {
3226 /* NIOS2 pc relative relocations are relative to the next 32-bit instruction
3227 so we need to subtract 4 before doing a final_link_relocate. */
3228 symbol_value = symbol_value + addend - 4;
3229 addend = 0;
3230 return _bfd_final_link_relocate (howto, abfd, input_section,
3231 data, offset, symbol_value, addend);
3232 }
3233
3234 static bfd_reloc_status_type
3235 nios2_elf32_do_call26_relocate (bfd *abfd, reloc_howto_type *howto,
3236 asection *input_section,
3237 bfd_byte *data, bfd_vma offset,
3238 bfd_vma symbol_value, bfd_vma addend)
3239 {
3240 /* Check that the relocation is in the same page as the current address. */
3241 if (CALL26_SEGMENT (symbol_value + addend)
3242 != CALL26_SEGMENT (input_section->output_section->vma
3243 + input_section->output_offset
3244 + offset))
3245 return bfd_reloc_overflow;
3246
3247 /* Check that the target address is correctly aligned on a 4-byte
3248 boundary. */
3249 if ((symbol_value + addend) & 0x3)
3250 return bfd_reloc_overflow;
3251
3252 return _bfd_final_link_relocate (howto, abfd, input_section,
3253 data, offset, symbol_value, addend);
3254 }
3255
3256 static bfd_reloc_status_type
3257 nios2_elf32_do_gprel_relocate (bfd *abfd, reloc_howto_type *howto,
3258 asection *input_section,
3259 bfd_byte *data, bfd_vma offset,
3260 bfd_vma symbol_value, bfd_vma addend)
3261 {
3262 /* Because we need the output_bfd, the special handling is done
3263 in nios2_elf32_relocate_section or in nios2_elf32_gprel_relocate. */
3264 return _bfd_final_link_relocate (howto, abfd, input_section,
3265 data, offset, symbol_value, addend);
3266 }
3267
3268 static bfd_reloc_status_type
3269 nios2_elf32_do_ujmp_relocate (bfd *abfd, reloc_howto_type *howto,
3270 asection *input_section,
3271 bfd_byte *data, bfd_vma offset,
3272 bfd_vma symbol_value, bfd_vma addend)
3273 {
3274 bfd_vma symbol_lo16, symbol_hi16;
3275 bfd_reloc_status_type r;
3276 symbol_value = symbol_value + addend;
3277 addend = 0;
3278 symbol_hi16 = (symbol_value >> 16) & 0xffff;
3279 symbol_lo16 = symbol_value & 0xffff;
3280
3281 r = _bfd_final_link_relocate (howto, abfd, input_section,
3282 data, offset, symbol_hi16, addend);
3283
3284 if (r == bfd_reloc_ok)
3285 return _bfd_final_link_relocate (howto, abfd, input_section,
3286 data, offset + 4, symbol_lo16, addend);
3287
3288 return r;
3289 }
3290
3291 static bfd_reloc_status_type
3292 nios2_elf32_do_cjmp_relocate (bfd *abfd, reloc_howto_type *howto,
3293 asection *input_section,
3294 bfd_byte *data, bfd_vma offset,
3295 bfd_vma symbol_value, bfd_vma addend)
3296 {
3297 bfd_vma symbol_lo16, symbol_hi16;
3298 bfd_reloc_status_type r;
3299 symbol_value = symbol_value + addend;
3300 addend = 0;
3301 symbol_hi16 = (symbol_value >> 16) & 0xffff;
3302 symbol_lo16 = symbol_value & 0xffff;
3303
3304 r = _bfd_final_link_relocate (howto, abfd, input_section,
3305 data, offset, symbol_hi16, addend);
3306
3307 if (r == bfd_reloc_ok)
3308 return _bfd_final_link_relocate (howto, abfd, input_section,
3309 data, offset + 4, symbol_lo16, addend);
3310
3311 return r;
3312 }
3313
3314 static bfd_reloc_status_type
3315 nios2_elf32_do_callr_relocate (bfd *abfd, reloc_howto_type *howto,
3316 asection *input_section,
3317 bfd_byte *data, bfd_vma offset,
3318 bfd_vma symbol_value, bfd_vma addend)
3319 {
3320 bfd_vma symbol_lo16, symbol_hi16;
3321 bfd_reloc_status_type r;
3322 symbol_value = symbol_value + addend;
3323 addend = 0;
3324 symbol_hi16 = (symbol_value >> 16) & 0xffff;
3325 symbol_lo16 = symbol_value & 0xffff;
3326
3327 r = _bfd_final_link_relocate (howto, abfd, input_section,
3328 data, offset, symbol_hi16, addend);
3329
3330 if (r == bfd_reloc_ok)
3331 return _bfd_final_link_relocate (howto, abfd, input_section,
3332 data, offset + 4, symbol_lo16, addend);
3333
3334 return r;
3335 }
3336
3337 /* HOWTO handlers for relocations that require special handling. */
3338
3339 /* This is for relocations used only when relaxing to ensure
3340 changes in size of section don't screw up .align. */
3341 static bfd_reloc_status_type
3342 nios2_elf32_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc_entry,
3343 asymbol *symbol ATTRIBUTE_UNUSED,
3344 void *data ATTRIBUTE_UNUSED, asection *input_section,
3345 bfd *output_bfd,
3346 char **error_message ATTRIBUTE_UNUSED)
3347 {
3348 if (output_bfd != NULL)
3349 reloc_entry->address += input_section->output_offset;
3350 return bfd_reloc_ok;
3351 }
3352
3353 static bfd_reloc_status_type
3354 nios2_elf32_hi16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3355 void *data, asection *input_section,
3356 bfd *output_bfd,
3357 char **error_message ATTRIBUTE_UNUSED)
3358 {
3359 /* This part is from bfd_elf_generic_reloc. */
3360 if (output_bfd != NULL
3361 && (symbol->flags & BSF_SECTION_SYM) == 0
3362 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3363 {
3364 reloc_entry->address += input_section->output_offset;
3365 return bfd_reloc_ok;
3366 }
3367
3368 if (output_bfd != NULL)
3369 /* FIXME: See bfd_perform_relocation. Is this right? */
3370 return bfd_reloc_continue;
3371
3372 return nios2_elf32_do_hi16_relocate (abfd, reloc_entry->howto,
3373 input_section,
3374 data, reloc_entry->address,
3375 (symbol->value
3376 + symbol->section->output_section->vma
3377 + symbol->section->output_offset),
3378 reloc_entry->addend);
3379 }
3380
3381 static bfd_reloc_status_type
3382 nios2_elf32_lo16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3383 void *data, asection *input_section,
3384 bfd *output_bfd,
3385 char **error_message ATTRIBUTE_UNUSED)
3386 {
3387 /* This part is from bfd_elf_generic_reloc. */
3388 if (output_bfd != NULL
3389 && (symbol->flags & BSF_SECTION_SYM) == 0
3390 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3391 {
3392 reloc_entry->address += input_section->output_offset;
3393 return bfd_reloc_ok;
3394 }
3395
3396 if (output_bfd != NULL)
3397 /* FIXME: See bfd_perform_relocation. Is this right? */
3398 return bfd_reloc_continue;
3399
3400 return nios2_elf32_do_lo16_relocate (abfd, reloc_entry->howto,
3401 input_section,
3402 data, reloc_entry->address,
3403 (symbol->value
3404 + symbol->section->output_section->vma
3405 + symbol->section->output_offset),
3406 reloc_entry->addend);
3407 }
3408
3409 static bfd_reloc_status_type
3410 nios2_elf32_hiadj16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3411 void *data, asection *input_section,
3412 bfd *output_bfd,
3413 char **error_message ATTRIBUTE_UNUSED)
3414 {
3415 /* This part is from bfd_elf_generic_reloc. */
3416 if (output_bfd != NULL
3417 && (symbol->flags & BSF_SECTION_SYM) == 0
3418 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3419 {
3420 reloc_entry->address += input_section->output_offset;
3421 return bfd_reloc_ok;
3422 }
3423
3424 if (output_bfd != NULL)
3425 /* FIXME: See bfd_perform_relocation. Is this right? */
3426 return bfd_reloc_continue;
3427
3428 return nios2_elf32_do_hiadj16_relocate (abfd, reloc_entry->howto,
3429 input_section,
3430 data, reloc_entry->address,
3431 (symbol->value
3432 + symbol->section->output_section->vma
3433 + symbol->section->output_offset),
3434 reloc_entry->addend);
3435 }
3436
3437 static bfd_reloc_status_type
3438 nios2_elf32_pcrel_lo16_relocate (bfd *abfd, arelent *reloc_entry,
3439 asymbol *symbol, void *data,
3440 asection *input_section, bfd *output_bfd,
3441 char **error_message ATTRIBUTE_UNUSED)
3442 {
3443 /* This part is from bfd_elf_generic_reloc. */
3444 if (output_bfd != NULL
3445 && (symbol->flags & BSF_SECTION_SYM) == 0
3446 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3447 {
3448 reloc_entry->address += input_section->output_offset;
3449 return bfd_reloc_ok;
3450 }
3451
3452 if (output_bfd != NULL)
3453 /* FIXME: See bfd_perform_relocation. Is this right? */
3454 return bfd_reloc_continue;
3455
3456 return nios2_elf32_do_pcrel_lo16_relocate (
3457 abfd, reloc_entry->howto, input_section, data, reloc_entry->address,
3458 (symbol->value + symbol->section->output_section->vma
3459 + symbol->section->output_offset),
3460 reloc_entry->addend);
3461 }
3462
3463 static bfd_reloc_status_type
3464 nios2_elf32_pcrel_hiadj16_relocate (bfd *abfd, arelent *reloc_entry,
3465 asymbol *symbol, void *data,
3466 asection *input_section, bfd *output_bfd,
3467 char **error_message ATTRIBUTE_UNUSED)
3468 {
3469 /* This part is from bfd_elf_generic_reloc. */
3470 if (output_bfd != NULL
3471 && (symbol->flags & BSF_SECTION_SYM) == 0
3472 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3473 {
3474 reloc_entry->address += input_section->output_offset;
3475 return bfd_reloc_ok;
3476 }
3477
3478 if (output_bfd != NULL)
3479 /* FIXME: See bfd_perform_relocation. Is this right? */
3480 return bfd_reloc_continue;
3481
3482 return nios2_elf32_do_pcrel_hiadj16_relocate (
3483 abfd, reloc_entry->howto, input_section, data, reloc_entry->address,
3484 (symbol->value + symbol->section->output_section->vma
3485 + symbol->section->output_offset),
3486 reloc_entry->addend);
3487 }
3488
3489 static bfd_reloc_status_type
3490 nios2_elf32_pcrel16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3491 void *data, asection *input_section,
3492 bfd *output_bfd,
3493 char **error_message ATTRIBUTE_UNUSED)
3494 {
3495 /* This part is from bfd_elf_generic_reloc. */
3496 if (output_bfd != NULL
3497 && (symbol->flags & BSF_SECTION_SYM) == 0
3498 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3499 {
3500 reloc_entry->address += input_section->output_offset;
3501 return bfd_reloc_ok;
3502 }
3503
3504 if (output_bfd != NULL)
3505 /* FIXME: See bfd_perform_relocation. Is this right? */
3506 return bfd_reloc_continue;
3507
3508 return nios2_elf32_do_pcrel16_relocate (abfd, reloc_entry->howto,
3509 input_section,
3510 data, reloc_entry->address,
3511 (symbol->value
3512 + symbol->section->output_section->vma
3513 + symbol->section->output_offset),
3514 reloc_entry->addend);
3515 }
3516
3517 static bfd_reloc_status_type
3518 nios2_elf32_call26_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3519 void *data, asection *input_section,
3520 bfd *output_bfd,
3521 char **error_message ATTRIBUTE_UNUSED)
3522 {
3523 /* This part is from bfd_elf_generic_reloc. */
3524 if (output_bfd != NULL
3525 && (symbol->flags & BSF_SECTION_SYM) == 0
3526 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3527 {
3528 reloc_entry->address += input_section->output_offset;
3529 return bfd_reloc_ok;
3530 }
3531
3532 if (output_bfd != NULL)
3533 /* FIXME: See bfd_perform_relocation. Is this right? */
3534 return bfd_reloc_continue;
3535
3536 return nios2_elf32_do_call26_relocate (abfd, reloc_entry->howto,
3537 input_section,
3538 data, reloc_entry->address,
3539 (symbol->value
3540 + symbol->section->output_section->vma
3541 + symbol->section->output_offset),
3542 reloc_entry->addend);
3543 }
3544
3545 static bfd_reloc_status_type
3546 nios2_elf32_gprel_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3547 void *data, asection *input_section,
3548 bfd *output_bfd, char **msg)
3549 {
3550 bfd_vma relocation;
3551 bfd_vma gp;
3552 bfd_reloc_status_type r;
3553
3554
3555 /* This part is from bfd_elf_generic_reloc. */
3556 if (output_bfd != NULL
3557 && (symbol->flags & BSF_SECTION_SYM) == 0
3558 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3559 {
3560 reloc_entry->address += input_section->output_offset;
3561 return bfd_reloc_ok;
3562 }
3563
3564 if (output_bfd != NULL)
3565 /* FIXME: See bfd_perform_relocation. Is this right? */
3566 return bfd_reloc_continue;
3567
3568 relocation = (symbol->value
3569 + symbol->section->output_section->vma
3570 + symbol->section->output_offset);
3571
3572 /* This assumes we've already cached the _gp symbol. */
3573 r = nios2_elf_final_gp (abfd, symbol, false, msg, &gp);
3574 if (r == bfd_reloc_ok)
3575 {
3576 relocation = relocation + reloc_entry->addend - gp;
3577 reloc_entry->addend = 0;
3578 if ((signed) relocation < -32768 || (signed) relocation > 32767)
3579 {
3580 *msg = _("global pointer relative address out of range");
3581 r = bfd_reloc_outofrange;
3582 }
3583 else
3584 r = nios2_elf32_do_gprel_relocate (abfd, reloc_entry->howto,
3585 input_section,
3586 data, reloc_entry->address,
3587 relocation, reloc_entry->addend);
3588 }
3589
3590 return r;
3591 }
3592
3593 static bfd_reloc_status_type
3594 nios2_elf32_ujmp_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3595 void *data, asection *input_section,
3596 bfd *output_bfd, char **msg ATTRIBUTE_UNUSED)
3597 {
3598 /* This part is from bfd_elf_generic_reloc. */
3599 if (output_bfd != NULL
3600 && (symbol->flags & BSF_SECTION_SYM) == 0
3601 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3602 {
3603 reloc_entry->address += input_section->output_offset;
3604 return bfd_reloc_ok;
3605 }
3606
3607 if (output_bfd != NULL)
3608 /* FIXME: See bfd_perform_relocation. Is this right? */
3609 return bfd_reloc_continue;
3610
3611 return nios2_elf32_do_ujmp_relocate (abfd, reloc_entry->howto,
3612 input_section,
3613 data, reloc_entry->address,
3614 (symbol->value
3615 + symbol->section->output_section->vma
3616 + symbol->section->output_offset),
3617 reloc_entry->addend);
3618 }
3619
3620 static bfd_reloc_status_type
3621 nios2_elf32_cjmp_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3622 void *data, asection *input_section,
3623 bfd *output_bfd, char **msg ATTRIBUTE_UNUSED)
3624 {
3625 /* This part is from bfd_elf_generic_reloc. */
3626 if (output_bfd != NULL
3627 && (symbol->flags & BSF_SECTION_SYM) == 0
3628 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3629 {
3630 reloc_entry->address += input_section->output_offset;
3631 return bfd_reloc_ok;
3632 }
3633
3634 if (output_bfd != NULL)
3635 /* FIXME: See bfd_perform_relocation. Is this right? */
3636 return bfd_reloc_continue;
3637
3638 return nios2_elf32_do_cjmp_relocate (abfd, reloc_entry->howto,
3639 input_section,
3640 data, reloc_entry->address,
3641 (symbol->value
3642 + symbol->section->output_section->vma
3643 + symbol->section->output_offset),
3644 reloc_entry->addend);
3645 }
3646
3647 static bfd_reloc_status_type
3648 nios2_elf32_callr_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3649 void *data, asection *input_section,
3650 bfd *output_bfd, char **msg ATTRIBUTE_UNUSED)
3651 {
3652 /* This part is from bfd_elf_generic_reloc. */
3653 if (output_bfd != NULL
3654 && (symbol->flags & BSF_SECTION_SYM) == 0
3655 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3656 {
3657 reloc_entry->address += input_section->output_offset;
3658 return bfd_reloc_ok;
3659 }
3660
3661 if (output_bfd != NULL)
3662 /* FIXME: See bfd_perform_relocation. Is this right? */
3663 return bfd_reloc_continue;
3664
3665 return nios2_elf32_do_callr_relocate (abfd, reloc_entry->howto,
3666 input_section,
3667 data, reloc_entry->address,
3668 (symbol->value
3669 + symbol->section->output_section->vma
3670 + symbol->section->output_offset),
3671 reloc_entry->addend);
3672 }
3673
3674
3675 /* Implement elf_backend_relocate_section. */
3676 static int
3677 nios2_elf32_relocate_section (bfd *output_bfd,
3678 struct bfd_link_info *info,
3679 bfd *input_bfd,
3680 asection *input_section,
3681 bfd_byte *contents,
3682 Elf_Internal_Rela *relocs,
3683 Elf_Internal_Sym *local_syms,
3684 asection **local_sections)
3685 {
3686 Elf_Internal_Shdr *symtab_hdr;
3687 struct elf_link_hash_entry **sym_hashes;
3688 Elf_Internal_Rela *rel;
3689 Elf_Internal_Rela *relend;
3690 struct elf32_nios2_link_hash_table *htab;
3691 asection *sgot;
3692 asection *splt;
3693 asection *sreloc = NULL;
3694 bfd_vma *local_got_offsets;
3695 bfd_vma got_base;
3696
3697 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3698 sym_hashes = elf_sym_hashes (input_bfd);
3699 relend = relocs + input_section->reloc_count;
3700
3701 htab = elf32_nios2_hash_table (info);
3702 sgot = htab->root.sgot;
3703 splt = htab->root.splt;
3704 local_got_offsets = elf_local_got_offsets (input_bfd);
3705
3706 if (htab->h_gp_got == NULL)
3707 got_base = 0;
3708 else
3709 got_base = htab->h_gp_got->root.u.def.value;
3710
3711 for (rel = relocs; rel < relend; rel++)
3712 {
3713 reloc_howto_type *howto;
3714 unsigned long r_symndx;
3715 Elf_Internal_Sym *sym;
3716 asection *sec;
3717 struct elf_link_hash_entry *h;
3718 struct elf32_nios2_link_hash_entry *eh;
3719 bfd_vma relocation;
3720 bfd_vma gp;
3721 bfd_reloc_status_type r = bfd_reloc_ok;
3722 const char *name = NULL;
3723 int r_type;
3724 const char *format;
3725 char *msg = NULL;
3726 bool unresolved_reloc;
3727 bfd_vma off;
3728 int use_plt;
3729
3730 r_type = ELF32_R_TYPE (rel->r_info);
3731 r_symndx = ELF32_R_SYM (rel->r_info);
3732
3733 howto = lookup_howto ((unsigned) ELF32_R_TYPE (rel->r_info), output_bfd);
3734 h = NULL;
3735 sym = NULL;
3736 sec = NULL;
3737
3738 if (r_symndx < symtab_hdr->sh_info)
3739 {
3740 sym = local_syms + r_symndx;
3741 sec = local_sections[r_symndx];
3742 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3743 }
3744 else
3745 {
3746 bool warned, ignored;
3747
3748 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3749 r_symndx, symtab_hdr, sym_hashes,
3750 h, sec, relocation,
3751 unresolved_reloc, warned, ignored);
3752 }
3753
3754 if (sec && discarded_section (sec))
3755 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3756 rel, 1, relend, howto, 0, contents);
3757
3758 /* Nothing more to do unless this is a final link. */
3759 if (bfd_link_relocatable (info))
3760 continue;
3761
3762 if (howto)
3763 {
3764 bool resolved_to_zero;
3765
3766 resolved_to_zero = (h != NULL
3767 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
3768 switch (howto->type)
3769 {
3770 case R_NIOS2_HI16:
3771 r = nios2_elf32_do_hi16_relocate (input_bfd, howto,
3772 input_section,
3773 contents, rel->r_offset,
3774 relocation, rel->r_addend);
3775 break;
3776 case R_NIOS2_LO16:
3777 r = nios2_elf32_do_lo16_relocate (input_bfd, howto,
3778 input_section,
3779 contents, rel->r_offset,
3780 relocation, rel->r_addend);
3781 break;
3782 case R_NIOS2_PCREL_LO:
3783 r = nios2_elf32_do_pcrel_lo16_relocate (input_bfd, howto,
3784 input_section,
3785 contents,
3786 rel->r_offset,
3787 relocation,
3788 rel->r_addend);
3789 break;
3790 case R_NIOS2_HIADJ16:
3791 r = nios2_elf32_do_hiadj16_relocate (input_bfd, howto,
3792 input_section, contents,
3793 rel->r_offset, relocation,
3794 rel->r_addend);
3795 break;
3796 case R_NIOS2_PCREL_HA:
3797 r = nios2_elf32_do_pcrel_hiadj16_relocate (input_bfd, howto,
3798 input_section,
3799 contents,
3800 rel->r_offset,
3801 relocation,
3802 rel->r_addend);
3803 break;
3804 case R_NIOS2_PCREL16:
3805 r = nios2_elf32_do_pcrel16_relocate (input_bfd, howto,
3806 input_section, contents,
3807 rel->r_offset, relocation,
3808 rel->r_addend);
3809 break;
3810 case R_NIOS2_GPREL:
3811 /* Turns an absolute address into a gp-relative address. */
3812 if (!nios2_elf_assign_gp (output_bfd, &gp, info))
3813 {
3814 bfd_vma reloc_address;
3815
3816 if (sec && sec->output_section)
3817 reloc_address = (sec->output_section->vma
3818 + sec->output_offset
3819 + rel->r_offset);
3820 else
3821 reloc_address = 0;
3822
3823 format = _("global pointer relative relocation at address "
3824 "%#" PRIx64 " when _gp not defined\n");
3825 msg = bfd_asprintf (format, (uint64_t) reloc_address);
3826 r = bfd_reloc_dangerous;
3827 }
3828 else
3829 {
3830 bfd_vma symbol_address = rel->r_addend + relocation;
3831 relocation = symbol_address - gp;
3832 rel->r_addend = 0;
3833 if (((signed) relocation < -32768
3834 || (signed) relocation > 32767)
3835 && (!h
3836 || h->root.type == bfd_link_hash_defined
3837 || h->root.type == bfd_link_hash_defweak))
3838 {
3839 if (h)
3840 name = h->root.root.string;
3841 else
3842 {
3843 name = (bfd_elf_string_from_elf_section
3844 (input_bfd, symtab_hdr->sh_link,
3845 sym->st_name));
3846 if (name == NULL || *name == '\0')
3847 name = bfd_section_name (sec);
3848 }
3849 /* xgettext:c-format */
3850 format = _("unable to reach %s (at %#" PRIx64 ") from "
3851 "the global pointer (at %#" PRIx64 ") "
3852 "because the offset (%" PRId64 ") is out of "
3853 "the allowed range, -32678 to 32767\n" );
3854 msg = bfd_asprintf (format, name,
3855 (uint64_t) symbol_address,
3856 (uint64_t) gp,
3857 (int64_t) relocation);
3858 r = bfd_reloc_outofrange;
3859 }
3860 else
3861 r = _bfd_final_link_relocate (howto, input_bfd,
3862 input_section, contents,
3863 rel->r_offset, relocation,
3864 rel->r_addend);
3865 }
3866 break;
3867 case R_NIOS2_UJMP:
3868 r = nios2_elf32_do_ujmp_relocate (input_bfd, howto,
3869 input_section,
3870 contents, rel->r_offset,
3871 relocation, rel->r_addend);
3872 break;
3873 case R_NIOS2_CJMP:
3874 r = nios2_elf32_do_cjmp_relocate (input_bfd, howto,
3875 input_section,
3876 contents, rel->r_offset,
3877 relocation, rel->r_addend);
3878 break;
3879 case R_NIOS2_CALLR:
3880 r = nios2_elf32_do_callr_relocate (input_bfd, howto,
3881 input_section, contents,
3882 rel->r_offset, relocation,
3883 rel->r_addend);
3884 break;
3885 case R_NIOS2_CALL26:
3886 case R_NIOS2_CALL26_NOAT:
3887 /* If we have a call to an undefined weak symbol, we just want
3888 to stuff a zero in the bits of the call instruction and
3889 bypass the normal call26 relocation handling, because it'll
3890 diagnose an overflow error if address 0 isn't in the same
3891 256MB segment as the call site. Presumably the call
3892 should be guarded by a null check anyway. */
3893 if (h != NULL && h->root.type == bfd_link_hash_undefweak)
3894 {
3895 BFD_ASSERT (relocation == 0 && rel->r_addend == 0);
3896 r = _bfd_final_link_relocate (howto, input_bfd,
3897 input_section, contents,
3898 rel->r_offset, relocation,
3899 rel->r_addend);
3900 break;
3901 }
3902 /* Handle relocations which should use the PLT entry.
3903 NIOS2_BFD_RELOC_32 relocations will use the symbol's value,
3904 which may point to a PLT entry, but we don't need to handle
3905 that here. If we created a PLT entry, all branches in this
3906 object should go to it. */
3907 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1)
3908 {
3909 /* If we've created a .plt section, and assigned a PLT entry
3910 to this function, it should not be known to bind locally.
3911 If it were, we would have cleared the PLT entry. */
3912 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h));
3913
3914 relocation = (splt->output_section->vma
3915 + splt->output_offset
3916 + h->plt.offset);
3917
3918 unresolved_reloc = false;
3919 }
3920 /* Detect R_NIOS2_CALL26 relocations that would overflow the
3921 256MB segment. Replace the target with a reference to a
3922 trampoline instead.
3923 Note that htab->stub_group is null if relaxation has been
3924 disabled by the --no-relax linker command-line option, so
3925 we can use that to skip this processing entirely. */
3926 if (howto->type == R_NIOS2_CALL26 && htab->stub_group)
3927 {
3928 bfd_vma dest = relocation + rel->r_addend;
3929 enum elf32_nios2_stub_type stub_type;
3930
3931 eh = (struct elf32_nios2_link_hash_entry *)h;
3932 stub_type = nios2_type_of_stub (input_section, rel, eh,
3933 htab, dest, NULL);
3934
3935 if (stub_type != nios2_stub_none)
3936 {
3937 struct elf32_nios2_stub_hash_entry *hsh;
3938
3939 hsh = nios2_get_stub_entry (input_section, sec,
3940 eh, rel, htab, stub_type);
3941 if (hsh == NULL)
3942 {
3943 r = bfd_reloc_undefined;
3944 break;
3945 }
3946
3947 dest = (hsh->stub_offset
3948 + hsh->stub_sec->output_offset
3949 + hsh->stub_sec->output_section->vma);
3950 r = nios2_elf32_do_call26_relocate (input_bfd, howto,
3951 input_section,
3952 contents,
3953 rel->r_offset,
3954 dest, 0);
3955 break;
3956 }
3957 }
3958
3959 /* Normal case. */
3960 r = nios2_elf32_do_call26_relocate (input_bfd, howto,
3961 input_section, contents,
3962 rel->r_offset, relocation,
3963 rel->r_addend);
3964 break;
3965 case R_NIOS2_ALIGN:
3966 r = bfd_reloc_ok;
3967 /* For symmetry this would be
3968 r = nios2_elf32_do_ignore_reloc (input_bfd, howto,
3969 input_section, contents,
3970 rel->r_offset, relocation,
3971 rel->r_addend);
3972 but do_ignore_reloc would do no more than return
3973 bfd_reloc_ok. */
3974 break;
3975
3976 case R_NIOS2_GOT16:
3977 case R_NIOS2_CALL16:
3978 case R_NIOS2_GOT_LO:
3979 case R_NIOS2_GOT_HA:
3980 case R_NIOS2_CALL_LO:
3981 case R_NIOS2_CALL_HA:
3982 /* Relocation is to the entry for this symbol in the
3983 global offset table. */
3984 if (sgot == NULL)
3985 {
3986 r = bfd_reloc_notsupported;
3987 break;
3988 }
3989
3990 use_plt = 0;
3991
3992 if (h != NULL)
3993 {
3994 bool dyn;
3995
3996 eh = (struct elf32_nios2_link_hash_entry *)h;
3997 use_plt = (eh->got_types_used == CALL_USED
3998 && h->plt.offset != (bfd_vma) -1);
3999
4000 off = h->got.offset;
4001 BFD_ASSERT (off != (bfd_vma) -1);
4002 dyn = htab->root.dynamic_sections_created;
4003 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4004 bfd_link_pic (info),
4005 h)
4006 || (bfd_link_pic (info)
4007 && SYMBOL_REFERENCES_LOCAL (info, h))
4008 || ((ELF_ST_VISIBILITY (h->other)
4009 || resolved_to_zero)
4010 && h->root.type == bfd_link_hash_undefweak))
4011 {
4012 /* This is actually a static link, or it is a -Bsymbolic
4013 link and the symbol is defined locally. We must
4014 initialize this entry in the global offset table.
4015 Since the offset must always be a multiple of 4, we
4016 use the least significant bit to record whether we
4017 have initialized it already.
4018
4019 When doing a dynamic link, we create a .rela.got
4020 relocation entry to initialize the value. This is
4021 done in the finish_dynamic_symbol routine. */
4022 if ((off & 1) != 0)
4023 off &= ~1;
4024 else
4025 {
4026 bfd_put_32 (output_bfd, relocation,
4027 sgot->contents + off);
4028 h->got.offset |= 1;
4029 }
4030 }
4031 else
4032 unresolved_reloc = false;
4033 }
4034 else
4035 {
4036 BFD_ASSERT (local_got_offsets != NULL
4037 && local_got_offsets[r_symndx] != (bfd_vma) -1);
4038
4039 off = local_got_offsets[r_symndx];
4040
4041 /* The offset must always be a multiple of 4. We use the
4042 least significant bit to record whether we have already
4043 generated the necessary reloc. */
4044 if ((off & 1) != 0)
4045 off &= ~1;
4046 else
4047 {
4048 bfd_put_32 (output_bfd, relocation,
4049 sgot->contents + off);
4050
4051 if (bfd_link_pic (info))
4052 {
4053 asection *srelgot;
4054 Elf_Internal_Rela outrel;
4055 bfd_byte *loc;
4056
4057 srelgot = htab->root.srelgot;
4058 BFD_ASSERT (srelgot != NULL);
4059
4060 outrel.r_addend = relocation;
4061 outrel.r_offset = (sgot->output_section->vma
4062 + sgot->output_offset
4063 + off);
4064 outrel.r_info = ELF32_R_INFO (0, R_NIOS2_RELATIVE);
4065 loc = srelgot->contents;
4066 loc += (srelgot->reloc_count++ *
4067 sizeof (Elf32_External_Rela));
4068 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
4069 }
4070
4071 local_got_offsets[r_symndx] |= 1;
4072 }
4073 }
4074
4075 if (use_plt && bfd_link_pic (info))
4076 {
4077 off = ((h->plt.offset - 24) / 12 + 3) * 4;
4078 relocation = (htab->root.sgotplt->output_offset + off
4079 - got_base);
4080 }
4081 else
4082 relocation = sgot->output_offset + off - got_base;
4083
4084 /* This relocation does not use the addend. */
4085 rel->r_addend = 0;
4086
4087 switch (howto->type)
4088 {
4089 case R_NIOS2_GOT_LO:
4090 case R_NIOS2_CALL_LO:
4091 r = nios2_elf32_do_lo16_relocate (input_bfd, howto,
4092 input_section, contents,
4093 rel->r_offset, relocation,
4094 rel->r_addend);
4095 break;
4096 case R_NIOS2_GOT_HA:
4097 case R_NIOS2_CALL_HA:
4098 r = nios2_elf32_do_hiadj16_relocate (input_bfd, howto,
4099 input_section, contents,
4100 rel->r_offset,
4101 relocation,
4102 rel->r_addend);
4103 break;
4104 default:
4105 r = _bfd_final_link_relocate (howto, input_bfd,
4106 input_section, contents,
4107 rel->r_offset, relocation,
4108 rel->r_addend);
4109 break;
4110 }
4111 break;
4112
4113 case R_NIOS2_GOTOFF_LO:
4114 case R_NIOS2_GOTOFF_HA:
4115 case R_NIOS2_GOTOFF:
4116 /* Relocation is relative to the global offset table pointer. */
4117
4118 BFD_ASSERT (sgot != NULL);
4119 if (sgot == NULL)
4120 {
4121 r = bfd_reloc_notsupported;
4122 break;
4123 }
4124
4125 /* Note that sgot->output_offset is not involved in this
4126 calculation. We always want the start of .got. */
4127 relocation -= sgot->output_section->vma;
4128
4129 /* Now we adjust the relocation to be relative to the GOT pointer
4130 (the _gp_got symbol), which possibly contains the 0x8000 bias. */
4131 relocation -= got_base;
4132
4133 switch (howto->type)
4134 {
4135 case R_NIOS2_GOTOFF_LO:
4136 r = nios2_elf32_do_lo16_relocate (input_bfd, howto,
4137 input_section, contents,
4138 rel->r_offset, relocation,
4139 rel->r_addend);
4140 break;
4141 case R_NIOS2_GOTOFF_HA:
4142 r = nios2_elf32_do_hiadj16_relocate (input_bfd, howto,
4143 input_section, contents,
4144 rel->r_offset,
4145 relocation,
4146 rel->r_addend);
4147 break;
4148 default:
4149 r = _bfd_final_link_relocate (howto, input_bfd,
4150 input_section, contents,
4151 rel->r_offset, relocation,
4152 rel->r_addend);
4153 break;
4154 }
4155 break;
4156
4157 case R_NIOS2_TLS_LDO16:
4158 relocation -= dtpoff_base (info) + DTP_OFFSET;
4159
4160 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4161 contents, rel->r_offset,
4162 relocation, rel->r_addend);
4163 break;
4164 case R_NIOS2_TLS_LDM16:
4165 if (htab->root.sgot == NULL)
4166 abort ();
4167
4168 off = htab->tls_ldm_got.offset;
4169
4170 if ((off & 1) != 0)
4171 off &= ~1;
4172 else
4173 {
4174 /* If we don't know the module number, create a relocation
4175 for it. */
4176 if (bfd_link_pic (info))
4177 {
4178 Elf_Internal_Rela outrel;
4179 bfd_byte *loc;
4180
4181 if (htab->root.srelgot == NULL)
4182 abort ();
4183
4184 outrel.r_addend = 0;
4185 outrel.r_offset = (htab->root.sgot->output_section->vma
4186 + htab->root.sgot->output_offset
4187 + off);
4188 outrel.r_info = ELF32_R_INFO (0, R_NIOS2_TLS_DTPMOD);
4189
4190 loc = htab->root.srelgot->contents;
4191 loc += (htab->root.srelgot->reloc_count++
4192 * sizeof (Elf32_External_Rela));
4193 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
4194 }
4195 else
4196 bfd_put_32 (output_bfd, 1,
4197 htab->root.sgot->contents + off);
4198
4199 htab->tls_ldm_got.offset |= 1;
4200 }
4201
4202 relocation = htab->root.sgot->output_offset + off - got_base;
4203
4204 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4205 contents, rel->r_offset,
4206 relocation, rel->r_addend);
4207
4208 break;
4209 case R_NIOS2_TLS_GD16:
4210 case R_NIOS2_TLS_IE16:
4211 {
4212 int indx;
4213 char tls_type;
4214
4215 if (htab->root.sgot == NULL)
4216 abort ();
4217
4218 indx = 0;
4219 if (h != NULL)
4220 {
4221 bool dyn;
4222 dyn = htab->root.dynamic_sections_created;
4223 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4224 bfd_link_pic (info),
4225 h)
4226 && (!bfd_link_pic (info)
4227 || !SYMBOL_REFERENCES_LOCAL (info, h)))
4228 {
4229 unresolved_reloc = false;
4230 indx = h->dynindx;
4231 }
4232 off = h->got.offset;
4233 tls_type = (((struct elf32_nios2_link_hash_entry *) h)
4234 ->tls_type);
4235 }
4236 else
4237 {
4238 if (local_got_offsets == NULL)
4239 abort ();
4240 off = local_got_offsets[r_symndx];
4241 tls_type = (elf32_nios2_local_got_tls_type (input_bfd)
4242 [r_symndx]);
4243 }
4244
4245 if (tls_type == GOT_UNKNOWN)
4246 abort ();
4247
4248 if ((off & 1) != 0)
4249 off &= ~1;
4250 else
4251 {
4252 bool need_relocs = false;
4253 Elf_Internal_Rela outrel;
4254 bfd_byte *loc = NULL;
4255 int cur_off = off;
4256
4257 /* The GOT entries have not been initialized yet. Do it
4258 now, and emit any relocations. If both an IE GOT and a
4259 GD GOT are necessary, we emit the GD first. */
4260
4261 if ((bfd_link_pic (info) || indx != 0)
4262 && (h == NULL
4263 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4264 && !resolved_to_zero)
4265 || h->root.type != bfd_link_hash_undefweak))
4266 {
4267 need_relocs = true;
4268 if (htab->root.srelgot == NULL)
4269 abort ();
4270 loc = htab->root.srelgot->contents;
4271 loc += (htab->root.srelgot->reloc_count *
4272 sizeof (Elf32_External_Rela));
4273 }
4274
4275 if (tls_type & GOT_TLS_GD)
4276 {
4277 if (need_relocs)
4278 {
4279 outrel.r_addend = 0;
4280 outrel.r_offset = (htab->root.sgot->output_section->vma
4281 + htab->root.sgot->output_offset
4282 + cur_off);
4283 outrel.r_info = ELF32_R_INFO (indx,
4284 R_NIOS2_TLS_DTPMOD);
4285
4286 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
4287 loc);
4288 htab->root.srelgot->reloc_count++;
4289 loc += sizeof (Elf32_External_Rela);
4290
4291 if (indx == 0)
4292 bfd_put_32 (output_bfd,
4293 (relocation - dtpoff_base (info) -
4294 DTP_OFFSET),
4295 htab->root.sgot->contents + cur_off + 4);
4296 else
4297 {
4298 outrel.r_addend = 0;
4299 outrel.r_info = ELF32_R_INFO (indx,
4300 R_NIOS2_TLS_DTPREL);
4301 outrel.r_offset += 4;
4302
4303 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
4304 loc);
4305 htab->root.srelgot->reloc_count++;
4306 loc += sizeof (Elf32_External_Rela);
4307 }
4308 }
4309 else
4310 {
4311 /* If we are not emitting relocations for a
4312 general dynamic reference, then we must be in a
4313 static link or an executable link with the
4314 symbol binding locally. Mark it as belonging
4315 to module 1, the executable. */
4316 bfd_put_32 (output_bfd, 1,
4317 htab->root.sgot->contents + cur_off);
4318 bfd_put_32 (output_bfd, (relocation -
4319 dtpoff_base (info) -
4320 DTP_OFFSET),
4321 htab->root.sgot->contents + cur_off + 4);
4322 }
4323
4324 cur_off += 8;
4325 }
4326
4327 if (tls_type & GOT_TLS_IE)
4328 {
4329 if (need_relocs)
4330 {
4331 if (indx == 0)
4332 outrel.r_addend = (relocation -
4333 dtpoff_base (info));
4334 else
4335 outrel.r_addend = 0;
4336 outrel.r_offset = (htab->root.sgot->output_section->vma
4337 + htab->root.sgot->output_offset
4338 + cur_off);
4339 outrel.r_info = ELF32_R_INFO (indx,
4340 R_NIOS2_TLS_TPREL);
4341
4342 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
4343 loc);
4344 htab->root.srelgot->reloc_count++;
4345 loc += sizeof (Elf32_External_Rela);
4346 }
4347 else
4348 bfd_put_32 (output_bfd, (tpoff (info, relocation)
4349 - TP_OFFSET),
4350 htab->root.sgot->contents + cur_off);
4351 cur_off += 4;
4352 }
4353
4354 if (h != NULL)
4355 h->got.offset |= 1;
4356 else
4357 local_got_offsets[r_symndx] |= 1;
4358 }
4359
4360 if ((tls_type & GOT_TLS_GD) && r_type != R_NIOS2_TLS_GD16)
4361 off += 8;
4362 relocation = htab->root.sgot->output_offset + off - got_base;
4363
4364 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4365 contents, rel->r_offset,
4366 relocation, rel->r_addend);
4367 }
4368
4369 break;
4370 case R_NIOS2_TLS_LE16:
4371 if (bfd_link_dll (info))
4372 {
4373 _bfd_error_handler
4374 /* xgettext:c-format */
4375 (_("%pB(%pA+%#" PRIx64 "): %s relocation not "
4376 "permitted in shared object"),
4377 input_bfd, input_section,
4378 (uint64_t) rel->r_offset, howto->name);
4379 return false;
4380 }
4381 else
4382 relocation = tpoff (info, relocation) - TP_OFFSET;
4383
4384 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4385 contents, rel->r_offset,
4386 relocation, rel->r_addend);
4387 break;
4388
4389 case R_NIOS2_BFD_RELOC_32:
4390 if (bfd_link_pic (info)
4391 && (input_section->flags & SEC_ALLOC) != 0
4392 && (h == NULL
4393 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4394 && !resolved_to_zero)
4395 || h->root.type != bfd_link_hash_undefweak))
4396 {
4397 Elf_Internal_Rela outrel;
4398 bfd_byte *loc;
4399 bool skip, relocate;
4400
4401 /* When generating a shared object, these relocations
4402 are copied into the output file to be resolved at run
4403 time. */
4404
4405 skip = false;
4406 relocate = false;
4407
4408 outrel.r_offset
4409 = _bfd_elf_section_offset (output_bfd, info,
4410 input_section, rel->r_offset);
4411 if (outrel.r_offset == (bfd_vma) -1)
4412 skip = true;
4413 else if (outrel.r_offset == (bfd_vma) -2)
4414 skip = true, relocate = true;
4415 outrel.r_offset += (input_section->output_section->vma
4416 + input_section->output_offset);
4417
4418 if (skip)
4419 memset (&outrel, 0, sizeof outrel);
4420 else if (h != NULL
4421 && h->dynindx != -1
4422 && (!bfd_link_pic (info)
4423 || !SYMBOLIC_BIND (info, h)
4424 || !h->def_regular))
4425 {
4426 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4427 outrel.r_addend = rel->r_addend;
4428 }
4429 else
4430 {
4431 /* This symbol is local, or marked to become local. */
4432 outrel.r_addend = relocation + rel->r_addend;
4433 relocate = true;
4434 outrel.r_info = ELF32_R_INFO (0, R_NIOS2_RELATIVE);
4435 }
4436
4437 sreloc = elf_section_data (input_section)->sreloc;
4438 if (sreloc == NULL)
4439 abort ();
4440
4441 loc = sreloc->contents;
4442 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
4443 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
4444
4445 /* This reloc will be computed at runtime, so there's no
4446 need to do anything now, except for R_NIOS2_BFD_RELOC_32
4447 relocations that have been turned into
4448 R_NIOS2_RELATIVE. */
4449 if (!relocate)
4450 break;
4451 }
4452
4453 r = _bfd_final_link_relocate (howto, input_bfd,
4454 input_section, contents,
4455 rel->r_offset, relocation,
4456 rel->r_addend);
4457 break;
4458
4459 case R_NIOS2_TLS_DTPREL:
4460 relocation -= dtpoff_base (info);
4461 /* Fall through. */
4462
4463 default:
4464 r = _bfd_final_link_relocate (howto, input_bfd,
4465 input_section, contents,
4466 rel->r_offset, relocation,
4467 rel->r_addend);
4468 break;
4469 }
4470 }
4471 else
4472 r = bfd_reloc_notsupported;
4473
4474 if (r != bfd_reloc_ok)
4475 {
4476 if (h != NULL)
4477 name = h->root.root.string;
4478 else
4479 {
4480 name = bfd_elf_string_from_elf_section (input_bfd,
4481 symtab_hdr->sh_link,
4482 sym->st_name);
4483 if (name == NULL || *name == '\0')
4484 name = bfd_section_name (sec);
4485 }
4486
4487 switch (r)
4488 {
4489 case bfd_reloc_overflow:
4490 (*info->callbacks->reloc_overflow) (info, NULL, name,
4491 howto->name, (bfd_vma) 0,
4492 input_bfd, input_section,
4493 rel->r_offset);
4494 break;
4495
4496 case bfd_reloc_undefined:
4497 (*info->callbacks->undefined_symbol) (info, name, input_bfd,
4498 input_section,
4499 rel->r_offset, true);
4500 break;
4501
4502 case bfd_reloc_outofrange:
4503 if (msg == NULL)
4504 msg = _("relocation out of range");
4505 break;
4506
4507 case bfd_reloc_notsupported:
4508 if (msg == NULL)
4509 msg = _("unsupported relocation");
4510 break;
4511
4512 case bfd_reloc_dangerous:
4513 if (msg == NULL)
4514 msg = _("dangerous relocation");
4515 break;
4516
4517 default:
4518 if (msg == NULL)
4519 msg = _("unknown error");
4520 break;
4521 }
4522
4523 if (msg)
4524 {
4525 (*info->callbacks->warning) (info, msg, name, input_bfd,
4526 input_section, rel->r_offset);
4527 return false;
4528 }
4529 }
4530 }
4531 return true;
4532 }
4533
4534 /* Implement elf-backend_section_flags:
4535 Convert NIOS2 specific section flags to bfd internal section flags. */
4536 static bool
4537 nios2_elf32_section_flags (const Elf_Internal_Shdr *hdr)
4538 {
4539 if (hdr->sh_flags & SHF_NIOS2_GPREL)
4540 hdr->bfd_section->flags |= SEC_SMALL_DATA;
4541
4542 return true;
4543 }
4544
4545 /* Implement elf_backend_fake_sections:
4546 Set the correct type for an NIOS2 ELF section. We do this by the
4547 section name, which is a hack, but ought to work. */
4548 static bool
4549 nios2_elf32_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
4550 Elf_Internal_Shdr *hdr, asection *sec)
4551 {
4552 const char *name = bfd_section_name (sec);
4553
4554 if ((sec->flags & SEC_SMALL_DATA)
4555 || strcmp (name, ".sdata") == 0
4556 || strcmp (name, ".sbss") == 0
4557 || strcmp (name, ".lit4") == 0 || strcmp (name, ".lit8") == 0)
4558 hdr->sh_flags |= SHF_NIOS2_GPREL;
4559
4560 return true;
4561 }
4562
4563 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
4564 shortcuts to them in our hash table. */
4565 static bool
4566 create_got_section (bfd *dynobj, struct bfd_link_info *info)
4567 {
4568 struct elf32_nios2_link_hash_table *htab;
4569 struct elf_link_hash_entry *h;
4570
4571 htab = elf32_nios2_hash_table (info);
4572
4573 if (! _bfd_elf_create_got_section (dynobj, info))
4574 return false;
4575
4576 /* In order for the two loads in .PLTresolve to share the same %hiadj,
4577 _GLOBAL_OFFSET_TABLE_ must be aligned to a 16-byte boundary. */
4578 if (!bfd_set_section_alignment (htab->root.sgotplt, 4))
4579 return false;
4580
4581 /* The Nios II ABI specifies that GOT-relative relocations are relative
4582 to the linker-created symbol _gp_got, rather than using
4583 _GLOBAL_OFFSET_TABLE_ directly. In particular, the latter always
4584 points to the base of the GOT while _gp_got may include a bias. */
4585 h = _bfd_elf_define_linkage_sym (dynobj, info, htab->root.sgotplt,
4586 "_gp_got");
4587 htab->h_gp_got = h;
4588 if (h == NULL)
4589 return false;
4590
4591 return true;
4592 }
4593
4594 /* Implement elf_backend_create_dynamic_sections:
4595 Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
4596 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
4597 hash table. */
4598 static bool
4599 nios2_elf32_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
4600 {
4601 struct elf32_nios2_link_hash_table *htab;
4602
4603 htab = elf32_nios2_hash_table (info);
4604 if (!htab->root.sgot && !create_got_section (dynobj, info))
4605 return false;
4606
4607 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
4608 return false;
4609
4610 /* In order for the two loads in a shared object .PLTresolve to share the
4611 same %hiadj, the start of the PLT (as well as the GOT) must be aligned
4612 to a 16-byte boundary. This is because the addresses for these loads
4613 include the -(.plt+4) PIC correction. */
4614 return bfd_set_section_alignment (htab->root.splt, 4);
4615 }
4616
4617 /* Implement elf_backend_copy_indirect_symbol:
4618 Copy the extra info we tack onto an elf_link_hash_entry. */
4619 static void
4620 nios2_elf32_copy_indirect_symbol (struct bfd_link_info *info,
4621 struct elf_link_hash_entry *dir,
4622 struct elf_link_hash_entry *ind)
4623 {
4624 struct elf32_nios2_link_hash_entry *edir, *eind;
4625
4626 edir = (struct elf32_nios2_link_hash_entry *) dir;
4627 eind = (struct elf32_nios2_link_hash_entry *) ind;
4628
4629 if (ind->root.type == bfd_link_hash_indirect
4630 && dir->got.refcount <= 0)
4631 {
4632 edir->tls_type = eind->tls_type;
4633 eind->tls_type = GOT_UNKNOWN;
4634 }
4635
4636 edir->got_types_used |= eind->got_types_used;
4637
4638 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
4639 }
4640
4641 /* Set the right machine number for a NIOS2 ELF file. */
4642
4643 static bool
4644 nios2_elf32_object_p (bfd *abfd)
4645 {
4646 unsigned long mach;
4647
4648 mach = elf_elfheader (abfd)->e_flags;
4649
4650 switch (mach)
4651 {
4652 default:
4653 case EF_NIOS2_ARCH_R1:
4654 bfd_default_set_arch_mach (abfd, bfd_arch_nios2, bfd_mach_nios2r1);
4655 break;
4656 case EF_NIOS2_ARCH_R2:
4657 bfd_default_set_arch_mach (abfd, bfd_arch_nios2, bfd_mach_nios2r2);
4658 break;
4659 }
4660
4661 return true;
4662 }
4663
4664 /* Implement elf_backend_check_relocs:
4665 Look through the relocs for a section during the first phase. */
4666 static bool
4667 nios2_elf32_check_relocs (bfd *abfd, struct bfd_link_info *info,
4668 asection *sec, const Elf_Internal_Rela *relocs)
4669 {
4670 Elf_Internal_Shdr *symtab_hdr;
4671 struct elf_link_hash_entry **sym_hashes;
4672 const Elf_Internal_Rela *rel;
4673 const Elf_Internal_Rela *rel_end;
4674 struct elf32_nios2_link_hash_table *htab;
4675 asection *sreloc = NULL;
4676 bfd_signed_vma *local_got_refcounts;
4677
4678 if (bfd_link_relocatable (info))
4679 return true;
4680
4681 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4682 sym_hashes = elf_sym_hashes (abfd);
4683 local_got_refcounts = elf_local_got_refcounts (abfd);
4684
4685 htab = elf32_nios2_hash_table (info);
4686
4687 rel_end = relocs + sec->reloc_count;
4688 for (rel = relocs; rel < rel_end; rel++)
4689 {
4690 unsigned int r_type;
4691 struct elf_link_hash_entry *h;
4692 unsigned long r_symndx;
4693
4694 r_symndx = ELF32_R_SYM (rel->r_info);
4695 if (r_symndx < symtab_hdr->sh_info)
4696 h = NULL;
4697 else
4698 {
4699 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4700 while (h->root.type == bfd_link_hash_indirect
4701 || h->root.type == bfd_link_hash_warning)
4702 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4703 }
4704
4705 r_type = ELF32_R_TYPE (rel->r_info);
4706
4707 switch (r_type)
4708 {
4709 case R_NIOS2_GOT16:
4710 case R_NIOS2_GOT_LO:
4711 case R_NIOS2_GOT_HA:
4712 case R_NIOS2_CALL16:
4713 case R_NIOS2_CALL_LO:
4714 case R_NIOS2_CALL_HA:
4715 case R_NIOS2_TLS_GD16:
4716 case R_NIOS2_TLS_IE16:
4717 /* This symbol requires a global offset table entry. */
4718 {
4719 int tls_type, old_tls_type;
4720
4721 switch (r_type)
4722 {
4723 default:
4724 case R_NIOS2_GOT16:
4725 case R_NIOS2_GOT_LO:
4726 case R_NIOS2_GOT_HA:
4727 case R_NIOS2_CALL16:
4728 case R_NIOS2_CALL_LO:
4729 case R_NIOS2_CALL_HA:
4730 tls_type = GOT_NORMAL;
4731 break;
4732 case R_NIOS2_TLS_GD16:
4733 tls_type = GOT_TLS_GD;
4734 break;
4735 case R_NIOS2_TLS_IE16:
4736 tls_type = GOT_TLS_IE;
4737 break;
4738 }
4739
4740 if (h != NULL)
4741 {
4742 struct elf32_nios2_link_hash_entry *eh
4743 = (struct elf32_nios2_link_hash_entry *)h;
4744 h->got.refcount++;
4745 old_tls_type = elf32_nios2_hash_entry(h)->tls_type;
4746 if (r_type == R_NIOS2_CALL16
4747 || r_type == R_NIOS2_CALL_LO
4748 || r_type == R_NIOS2_CALL_HA)
4749 {
4750 /* Make sure a plt entry is created for this symbol if
4751 it turns out to be a function defined by a dynamic
4752 object. */
4753 h->plt.refcount++;
4754 h->needs_plt = 1;
4755 h->type = STT_FUNC;
4756 eh->got_types_used |= CALL_USED;
4757 }
4758 else
4759 eh->got_types_used |= GOT_USED;
4760 }
4761 else
4762 {
4763 /* This is a global offset table entry for a local symbol. */
4764 if (local_got_refcounts == NULL)
4765 {
4766 bfd_size_type size;
4767
4768 size = symtab_hdr->sh_info;
4769 size *= (sizeof (bfd_signed_vma) + sizeof (char));
4770 local_got_refcounts
4771 = ((bfd_signed_vma *) bfd_zalloc (abfd, size));
4772 if (local_got_refcounts == NULL)
4773 return false;
4774 elf_local_got_refcounts (abfd) = local_got_refcounts;
4775 elf32_nios2_local_got_tls_type (abfd)
4776 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
4777 }
4778 local_got_refcounts[r_symndx]++;
4779 old_tls_type = elf32_nios2_local_got_tls_type (abfd) [r_symndx];
4780 }
4781
4782 /* We will already have issued an error message if there is a
4783 TLS / non-TLS mismatch, based on the symbol type. We don't
4784 support any linker relaxations. So just combine any TLS
4785 types needed. */
4786 if (old_tls_type != GOT_UNKNOWN && old_tls_type != GOT_NORMAL
4787 && tls_type != GOT_NORMAL)
4788 tls_type |= old_tls_type;
4789
4790 if (old_tls_type != tls_type)
4791 {
4792 if (h != NULL)
4793 elf32_nios2_hash_entry (h)->tls_type = tls_type;
4794 else
4795 elf32_nios2_local_got_tls_type (abfd) [r_symndx] = tls_type;
4796 }
4797 }
4798 make_got:
4799 if (htab->root.sgot == NULL)
4800 {
4801 if (htab->root.dynobj == NULL)
4802 htab->root.dynobj = abfd;
4803 if (!create_got_section (htab->root.dynobj, info))
4804 return false;
4805 }
4806 break;
4807
4808 case R_NIOS2_TLS_LDM16:
4809 htab->tls_ldm_got.refcount++;
4810 goto make_got;
4811
4812 /* This relocation describes the C++ object vtable hierarchy.
4813 Reconstruct it for later use during GC. */
4814 case R_NIOS2_GNU_VTINHERIT:
4815 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4816 return false;
4817 break;
4818
4819 /* This relocation describes which C++ vtable entries are actually
4820 used. Record for later use during GC. */
4821 case R_NIOS2_GNU_VTENTRY:
4822 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
4823 return false;
4824 break;
4825
4826 case R_NIOS2_BFD_RELOC_32:
4827 case R_NIOS2_CALL26:
4828 case R_NIOS2_CALL26_NOAT:
4829 case R_NIOS2_HIADJ16:
4830 case R_NIOS2_LO16:
4831
4832 if (h != NULL)
4833 {
4834 /* If this reloc is in a read-only section, we might
4835 need a copy reloc. We can't check reliably at this
4836 stage whether the section is read-only, as input
4837 sections have not yet been mapped to output sections.
4838 Tentatively set the flag for now, and correct in
4839 adjust_dynamic_symbol. */
4840 if (!bfd_link_pic (info))
4841 h->non_got_ref = 1;
4842
4843 /* Make sure a plt entry is created for this symbol if it
4844 turns out to be a function defined by a dynamic object. */
4845 h->plt.refcount++;
4846
4847 if (r_type == R_NIOS2_CALL26 || r_type == R_NIOS2_CALL26_NOAT)
4848 h->needs_plt = 1;
4849 }
4850
4851 /* If we are creating a shared library, we need to copy the
4852 reloc into the shared library. */
4853 if (bfd_link_pic (info)
4854 && (sec->flags & SEC_ALLOC) != 0
4855 && (r_type == R_NIOS2_BFD_RELOC_32
4856 || (h != NULL && ! h->needs_plt
4857 && (! SYMBOLIC_BIND (info, h) || ! h->def_regular))))
4858 {
4859 struct elf_dyn_relocs *p;
4860 struct elf_dyn_relocs **head;
4861
4862 /* When creating a shared object, we must copy these
4863 reloc types into the output file. We create a reloc
4864 section in dynobj and make room for this reloc. */
4865 if (sreloc == NULL)
4866 {
4867 if (htab->root.dynobj == NULL)
4868 htab->root.dynobj = abfd;
4869
4870 sreloc = _bfd_elf_make_dynamic_reloc_section
4871 (sec, htab->root.dynobj, 2, abfd, true);
4872 if (sreloc == NULL)
4873 return false;
4874 }
4875
4876 /* If this is a global symbol, we count the number of
4877 relocations we need for this symbol. */
4878 if (h != NULL)
4879 head = &h->dyn_relocs;
4880 else
4881 {
4882 /* Track dynamic relocs needed for local syms too.
4883 We really need local syms available to do this
4884 easily. Oh well. */
4885
4886 asection *s;
4887 void *vpp;
4888 Elf_Internal_Sym *isym;
4889
4890 isym = bfd_sym_from_r_symndx (&htab->root.sym_cache,
4891 abfd, r_symndx);
4892 if (isym == NULL)
4893 return false;
4894
4895 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
4896 if (s == NULL)
4897 s = sec;
4898
4899 vpp = &elf_section_data (s)->local_dynrel;
4900 head = (struct elf_dyn_relocs **) vpp;
4901 }
4902
4903 p = *head;
4904 if (p == NULL || p->sec != sec)
4905 {
4906 size_t amt = sizeof *p;
4907 p = ((struct elf_dyn_relocs *)
4908 bfd_alloc (htab->root.dynobj, amt));
4909 if (p == NULL)
4910 return false;
4911 p->next = *head;
4912 *head = p;
4913 p->sec = sec;
4914 p->count = 0;
4915 p->pc_count = 0;
4916 }
4917
4918 p->count += 1;
4919
4920 }
4921 break;
4922 }
4923 }
4924
4925 return true;
4926 }
4927
4928
4929 /* Implement elf_backend_gc_mark_hook:
4930 Return the section that should be marked against GC for a given
4931 relocation. */
4932 static asection *
4933 nios2_elf32_gc_mark_hook (asection *sec,
4934 struct bfd_link_info *info,
4935 Elf_Internal_Rela *rel,
4936 struct elf_link_hash_entry *h,
4937 Elf_Internal_Sym *sym)
4938 {
4939 if (h != NULL)
4940 switch (ELF32_R_TYPE (rel->r_info))
4941 {
4942 case R_NIOS2_GNU_VTINHERIT:
4943 case R_NIOS2_GNU_VTENTRY:
4944 return NULL;
4945 }
4946 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
4947 }
4948
4949 /* Implement elf_backend_finish_dynamic_symbols:
4950 Finish up dynamic symbol handling. We set the contents of various
4951 dynamic sections here. */
4952 static bool
4953 nios2_elf32_finish_dynamic_symbol (bfd *output_bfd,
4954 struct bfd_link_info *info,
4955 struct elf_link_hash_entry *h,
4956 Elf_Internal_Sym *sym)
4957 {
4958 struct elf32_nios2_link_hash_table *htab;
4959 struct elf32_nios2_link_hash_entry *eh
4960 = (struct elf32_nios2_link_hash_entry *)h;
4961 int use_plt;
4962
4963 htab = elf32_nios2_hash_table (info);
4964
4965 if (h->plt.offset != (bfd_vma) -1)
4966 {
4967 asection *splt;
4968 asection *sgotplt;
4969 asection *srela;
4970 bfd_vma plt_index;
4971 bfd_vma got_offset;
4972 Elf_Internal_Rela rela;
4973 bfd_byte *loc;
4974 bfd_vma got_address;
4975
4976 /* This symbol has an entry in the procedure linkage table. Set
4977 it up. */
4978 BFD_ASSERT (h->dynindx != -1);
4979 splt = htab->root.splt;
4980 sgotplt = htab->root.sgotplt;
4981 srela = htab->root.srelplt;
4982 BFD_ASSERT (splt != NULL && sgotplt != NULL && srela != NULL);
4983
4984 /* Emit the PLT entry. */
4985 if (bfd_link_pic (info))
4986 {
4987 bfd_vma br_offset;
4988
4989 nios2_elf32_install_data (splt, nios2_so_plt_entry, h->plt.offset,
4990 3);
4991 plt_index = (h->plt.offset - 24) / 12;
4992 got_offset = (plt_index + 3) * 4;
4993 nios2_elf32_install_imm16 (splt, h->plt.offset,
4994 hiadj (plt_index * 4));
4995 nios2_elf32_install_imm16 (splt, h->plt.offset + 4,
4996 plt_index * 4);
4997 br_offset = -(h->plt.offset + 12);
4998 /* If this plt entry is too far away from the start of .plt
4999 for the "br" to reach .PLTresolve, bounce through one or
5000 more of the previous "br" instructions. */
5001 if (br_offset < (bfd_vma) -32768)
5002 {
5003 br_offset += 32768 / 12 * 12 - 4;
5004 while (br_offset < (bfd_vma) -32768)
5005 br_offset += 32768 / 12 * 12;
5006 }
5007 nios2_elf32_install_imm16 (splt, h->plt.offset + 8, br_offset);
5008
5009 got_address = (sgotplt->output_section->vma + sgotplt->output_offset
5010 + got_offset);
5011
5012 /* Fill in the entry in the global offset table. There are no
5013 res_n slots for a shared object PLT, instead the .got.plt entries
5014 point to the PLT entries. */
5015 bfd_put_32 (output_bfd,
5016 splt->output_section->vma + splt->output_offset
5017 + h->plt.offset, sgotplt->contents + got_offset);
5018 }
5019 else
5020 {
5021 plt_index = (h->plt.offset - 28 - htab->res_n_size) / 12;
5022 got_offset = (plt_index + 3) * 4;
5023
5024 nios2_elf32_install_data (splt, nios2_plt_entry, h->plt.offset, 3);
5025 got_address = (sgotplt->output_section->vma + sgotplt->output_offset
5026 + got_offset);
5027 nios2_elf32_install_imm16 (splt, h->plt.offset, hiadj (got_address));
5028 nios2_elf32_install_imm16 (splt, h->plt.offset + 4, got_address);
5029
5030 /* Fill in the entry in the global offset table. */
5031 bfd_put_32 (output_bfd,
5032 splt->output_section->vma + splt->output_offset
5033 + plt_index * 4, sgotplt->contents + got_offset);
5034 }
5035
5036 /* Fill in the entry in the .rela.plt section. */
5037 rela.r_offset = got_address;
5038 rela.r_info = ELF32_R_INFO (h->dynindx, R_NIOS2_JUMP_SLOT);
5039 rela.r_addend = 0;
5040 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
5041 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5042
5043 if (!h->def_regular)
5044 {
5045 /* Mark the symbol as undefined, rather than as defined in
5046 the .plt section. Leave the value alone. */
5047 sym->st_shndx = SHN_UNDEF;
5048 /* If the symbol is weak, we do need to clear the value.
5049 Otherwise, the PLT entry would provide a definition for
5050 the symbol even if the symbol wasn't defined anywhere,
5051 and so the symbol would never be NULL. */
5052 if (!h->ref_regular_nonweak)
5053 sym->st_value = 0;
5054 }
5055 }
5056
5057 use_plt = (eh->got_types_used == CALL_USED
5058 && h->plt.offset != (bfd_vma) -1);
5059
5060 if (!use_plt && h->got.offset != (bfd_vma) -1
5061 && (elf32_nios2_hash_entry (h)->tls_type & GOT_TLS_GD) == 0
5062 && (elf32_nios2_hash_entry (h)->tls_type & GOT_TLS_IE) == 0)
5063 {
5064 asection *sgot;
5065 asection *srela;
5066 Elf_Internal_Rela rela;
5067 bfd_byte *loc;
5068 bfd_vma offset;
5069
5070 /* This symbol has an entry in the global offset table. Set it
5071 up. */
5072 sgot = htab->root.sgot;
5073 srela = htab->root.srelgot;
5074 BFD_ASSERT (sgot != NULL && srela != NULL);
5075
5076 offset = (h->got.offset & ~(bfd_vma) 1);
5077 rela.r_offset = (sgot->output_section->vma
5078 + sgot->output_offset + offset);
5079
5080 /* If this is a -Bsymbolic link, and the symbol is defined
5081 locally, we just want to emit a RELATIVE reloc. Likewise if
5082 the symbol was forced to be local because of a version file.
5083 The entry in the global offset table will already have been
5084 initialized in the relocate_section function. */
5085
5086 if (bfd_link_pic (info) && SYMBOL_REFERENCES_LOCAL (info, h))
5087 {
5088 rela.r_info = ELF32_R_INFO (0, R_NIOS2_RELATIVE);
5089 rela.r_addend = bfd_get_signed_32 (output_bfd,
5090 (sgot->contents + offset));
5091 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + offset);
5092 }
5093 else
5094 {
5095 bfd_put_32 (output_bfd, (bfd_vma) 0,
5096 sgot->contents + offset);
5097 rela.r_info = ELF32_R_INFO (h->dynindx, R_NIOS2_GLOB_DAT);
5098 rela.r_addend = 0;
5099 }
5100
5101 loc = srela->contents;
5102 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
5103 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5104 }
5105
5106 if (use_plt && h->got.offset != (bfd_vma) -1)
5107 {
5108 bfd_vma offset = (h->got.offset & ~(bfd_vma) 1);
5109 asection *sgot = htab->root.sgot;
5110 asection *splt = htab->root.splt;
5111 bfd_put_32 (output_bfd, (splt->output_section->vma + splt->output_offset
5112 + h->plt.offset),
5113 sgot->contents + offset);
5114 }
5115
5116 if (h->needs_copy)
5117 {
5118 asection *s;
5119 Elf_Internal_Rela rela;
5120 bfd_byte *loc;
5121
5122 /* This symbol needs a copy reloc. Set it up. */
5123 BFD_ASSERT (h->dynindx != -1
5124 && (h->root.type == bfd_link_hash_defined
5125 || h->root.type == bfd_link_hash_defweak));
5126
5127 rela.r_offset = (h->root.u.def.value
5128 + h->root.u.def.section->output_section->vma
5129 + h->root.u.def.section->output_offset);
5130 rela.r_info = ELF32_R_INFO (h->dynindx, R_NIOS2_COPY);
5131 rela.r_addend = 0;
5132 if (h->root.u.def.section == htab->root.sdynrelro)
5133 s = htab->root.sreldynrelro;
5134 else
5135 s = htab->root.srelbss;
5136 BFD_ASSERT (s != NULL);
5137 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
5138 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5139 }
5140
5141 /* Mark _DYNAMIC, _GLOBAL_OFFSET_TABLE_, and _gp_got as absolute. */
5142 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
5143 || h == htab->root.hgot
5144 || h == htab->h_gp_got)
5145 sym->st_shndx = SHN_ABS;
5146
5147 return true;
5148 }
5149
5150 /* Implement elf_backend_finish_dynamic_sections. */
5151 static bool
5152 nios2_elf32_finish_dynamic_sections (bfd *output_bfd,
5153 struct bfd_link_info *info)
5154 {
5155 asection *sgotplt;
5156 asection *sdyn;
5157 struct elf32_nios2_link_hash_table *htab;
5158
5159 htab = elf32_nios2_hash_table (info);
5160 sgotplt = htab->root.sgotplt;
5161 sdyn = NULL;
5162
5163 if (htab->root.dynamic_sections_created)
5164 {
5165 asection *splt;
5166 Elf32_External_Dyn *dyncon, *dynconend;
5167
5168 splt = htab->root.splt;
5169 sdyn = bfd_get_linker_section (htab->root.dynobj, ".dynamic");
5170 BFD_ASSERT (splt != NULL && sdyn != NULL && sgotplt != NULL);
5171
5172 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5173 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5174 for (; dyncon < dynconend; dyncon++)
5175 {
5176 Elf_Internal_Dyn dyn;
5177 asection *s;
5178
5179 bfd_elf32_swap_dyn_in (htab->root.dynobj, dyncon, &dyn);
5180
5181 switch (dyn.d_tag)
5182 {
5183 default:
5184 break;
5185
5186 case DT_PLTGOT:
5187 s = htab->root.sgotplt;
5188 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5189 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5190 break;
5191
5192 case DT_JMPREL:
5193 s = htab->root.srelplt;
5194 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5195 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5196 break;
5197
5198 case DT_PLTRELSZ:
5199 s = htab->root.srelplt;
5200 dyn.d_un.d_val = s->size;
5201 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5202 break;
5203
5204 case DT_NIOS2_GP:
5205 s = htab->root.sgotplt;
5206 dyn.d_un.d_ptr
5207 = s->output_section->vma + s->output_offset + 0x7ff0;
5208 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5209 break;
5210 }
5211 }
5212
5213 /* Fill in the first entry in the procedure linkage table. */
5214 if (splt->size > 0)
5215 {
5216 bfd_vma got_address = (sgotplt->output_section->vma
5217 + sgotplt->output_offset);
5218 if (bfd_link_pic (info))
5219 {
5220 bfd_vma got_pcrel = got_address - (splt->output_section->vma
5221 + splt->output_offset);
5222 /* Both GOT and PLT must be aligned to a 16-byte boundary
5223 for the two loads to share the %hiadj part. The 4-byte
5224 offset for nextpc is accounted for in the %lo offsets
5225 on the loads. */
5226 BFD_ASSERT ((got_pcrel & 0xf) == 0);
5227 nios2_elf32_install_data (splt, nios2_so_plt0_entry, 0, 6);
5228 nios2_elf32_install_imm16 (splt, 4, hiadj (got_pcrel));
5229 nios2_elf32_install_imm16 (splt, 12, got_pcrel);
5230 nios2_elf32_install_imm16 (splt, 16, got_pcrel + 4);
5231 }
5232 else
5233 {
5234 /* Divide by 4 here, not 3 because we already corrected for the
5235 res_N branches. */
5236 bfd_vma res_size = (splt->size - 28) / 4;
5237 bfd_vma res_start = (splt->output_section->vma
5238 + splt->output_offset);
5239 bfd_vma res_offset;
5240
5241 for (res_offset = 0; res_offset < res_size; res_offset += 4)
5242 bfd_put_32 (output_bfd,
5243 6 | ((res_size - (res_offset + 4)) << 6),
5244 splt->contents + res_offset);
5245
5246 /* The GOT must be aligned to a 16-byte boundary for the
5247 two loads to share the same %hiadj part. */
5248 BFD_ASSERT ((got_address & 0xf) == 0);
5249
5250 nios2_elf32_install_data (splt, nios2_plt0_entry, res_size, 7);
5251 nios2_elf32_install_imm16 (splt, res_size, hiadj (res_start));
5252 nios2_elf32_install_imm16 (splt, res_size + 4, res_start);
5253 nios2_elf32_install_imm16 (splt, res_size + 12,
5254 hiadj (got_address));
5255 nios2_elf32_install_imm16 (splt, res_size + 16,
5256 got_address + 4);
5257 nios2_elf32_install_imm16 (splt, res_size + 20,
5258 got_address + 8);
5259 }
5260 }
5261 }
5262
5263 /* Fill in the first three entries in the global offset table. */
5264 if (sgotplt != NULL && sgotplt->size > 0)
5265 {
5266 if (sdyn == NULL)
5267 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents);
5268 else
5269 bfd_put_32 (output_bfd,
5270 sdyn->output_section->vma + sdyn->output_offset,
5271 sgotplt->contents);
5272 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 4);
5273 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 8);
5274
5275 if (sgotplt->output_section != bfd_abs_section_ptr)
5276 elf_section_data (sgotplt->output_section)->this_hdr.sh_entsize = 4;
5277 }
5278
5279 return true;
5280 }
5281
5282 /* Implement elf_backend_adjust_dynamic_symbol:
5283 Adjust a symbol defined by a dynamic object and referenced by a
5284 regular object. The current definition is in some section of the
5285 dynamic object, but we're not including those sections. We have to
5286 change the definition to something the rest of the link can
5287 understand. */
5288 static bool
5289 nios2_elf32_adjust_dynamic_symbol (struct bfd_link_info *info,
5290 struct elf_link_hash_entry *h)
5291 {
5292 struct elf32_nios2_link_hash_table *htab;
5293 bfd *dynobj;
5294 asection *s, *srel;
5295 unsigned align2;
5296
5297 htab = elf32_nios2_hash_table (info);
5298 dynobj = htab->root.dynobj;
5299
5300 /* Make sure we know what is going on here. */
5301 BFD_ASSERT (dynobj != NULL
5302 && (h->needs_plt
5303 || h->is_weakalias
5304 || (h->def_dynamic
5305 && h->ref_regular
5306 && !h->def_regular)));
5307
5308 /* If this is a function, put it in the procedure linkage table. We
5309 will fill in the contents of the procedure linkage table later,
5310 when we know the address of the .got section. */
5311 if (h->type == STT_FUNC || h->needs_plt)
5312 {
5313 if (h->plt.refcount <= 0
5314 || SYMBOL_CALLS_LOCAL (info, h)
5315 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
5316 && h->root.type == bfd_link_hash_undefweak))
5317 {
5318 /* This case can occur if we saw a PLT reloc in an input
5319 file, but the symbol was never referred to by a dynamic
5320 object, or if all references were garbage collected. In
5321 such a case, we don't actually need to build a procedure
5322 linkage table, and we can just do a PCREL reloc instead. */
5323 h->plt.offset = (bfd_vma) -1;
5324 h->needs_plt = 0;
5325 }
5326
5327 return true;
5328 }
5329
5330 /* Reinitialize the plt offset now that it is not used as a reference
5331 count any more. */
5332 h->plt.offset = (bfd_vma) -1;
5333
5334 /* If this is a weak symbol, and there is a real definition, the
5335 processor independent code will have arranged for us to see the
5336 real definition first, and we can just use the same value. */
5337 if (h->is_weakalias)
5338 {
5339 struct elf_link_hash_entry *def = weakdef (h);
5340 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
5341 h->root.u.def.section = def->root.u.def.section;
5342 h->root.u.def.value = def->root.u.def.value;
5343 return true;
5344 }
5345
5346 /* If there are no non-GOT references, we do not need a copy
5347 relocation. */
5348 if (!h->non_got_ref)
5349 return true;
5350
5351 /* This is a reference to a symbol defined by a dynamic object which
5352 is not a function.
5353 If we are creating a shared library, we must presume that the
5354 only references to the symbol are via the global offset table.
5355 For such cases we need not do anything here; the relocations will
5356 be handled correctly by relocate_section. */
5357 if (bfd_link_pic (info))
5358 return true;
5359
5360 if (h->size == 0)
5361 {
5362 _bfd_error_handler (_("dynamic variable `%s' is zero size"),
5363 h->root.root.string);
5364 return true;
5365 }
5366
5367 /* We must allocate the symbol in our .dynbss section, which will
5368 become part of the .bss section of the executable. There will be
5369 an entry for this symbol in the .dynsym section. The dynamic
5370 object will contain position independent code, so all references
5371 from the dynamic object to this symbol will go through the global
5372 offset table. The dynamic linker will use the .dynsym entry to
5373 determine the address it must put in the global offset table, so
5374 both the dynamic object and the regular object will refer to the
5375 same memory location for the variable. */
5376 /* We must generate a R_NIOS2_COPY reloc to tell the dynamic linker to
5377 copy the initial value out of the dynamic object and into the
5378 runtime process image. We need to remember the offset into the
5379 .rela.bss section we are going to use. */
5380 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
5381 {
5382 s = htab->root.sdynrelro;
5383 srel = htab->root.sreldynrelro;
5384 }
5385 else
5386 {
5387 s = htab->root.sdynbss;
5388 srel = htab->root.srelbss;
5389 }
5390 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
5391 {
5392 srel->size += sizeof (Elf32_External_Rela);
5393 h->needs_copy = 1;
5394 }
5395
5396 align2 = bfd_log2 (h->size);
5397 if (align2 > h->root.u.def.section->alignment_power)
5398 align2 = h->root.u.def.section->alignment_power;
5399
5400 /* Align dynbss. */
5401 s->size = BFD_ALIGN (s->size, (bfd_size_type)1 << align2);
5402 if (align2 > bfd_section_alignment (s)
5403 && !bfd_set_section_alignment (s, align2))
5404 return false;
5405
5406 /* Define the symbol as being at this point in the section. */
5407 h->root.u.def.section = s;
5408 h->root.u.def.value = s->size;
5409
5410 /* Increment the section size to make room for the symbol. */
5411 s->size += h->size;
5412
5413 return true;
5414 }
5415
5416 /* Worker function for nios2_elf32_late_size_sections. */
5417 static bool
5418 adjust_dynrelocs (struct elf_link_hash_entry *h, void *inf)
5419 {
5420 struct bfd_link_info *info;
5421 struct elf32_nios2_link_hash_table *htab;
5422
5423 if (h->root.type == bfd_link_hash_indirect)
5424 return true;
5425
5426 if (h->root.type == bfd_link_hash_warning)
5427 /* When warning symbols are created, they **replace** the "real"
5428 entry in the hash table, thus we never get to see the real
5429 symbol in a hash traversal. So look at it now. */
5430 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5431
5432 info = (struct bfd_link_info *) inf;
5433 htab = elf32_nios2_hash_table (info);
5434
5435 if (h->plt.offset != (bfd_vma)-1)
5436 h->plt.offset += htab->res_n_size;
5437 if (htab->root.splt == h->root.u.def.section)
5438 h->root.u.def.value += htab->res_n_size;
5439
5440 return true;
5441 }
5442
5443 /* Another worker function for nios2_elf32_late_size_sections.
5444 Allocate space in .plt, .got and associated reloc sections for
5445 dynamic relocs. */
5446 static bool
5447 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
5448 {
5449 struct bfd_link_info *info;
5450 struct elf32_nios2_link_hash_table *htab;
5451 struct elf32_nios2_link_hash_entry *eh;
5452 struct elf_dyn_relocs *p;
5453 int use_plt;
5454
5455 if (h->root.type == bfd_link_hash_indirect)
5456 return true;
5457
5458 if (h->root.type == bfd_link_hash_warning)
5459 /* When warning symbols are created, they **replace** the "real"
5460 entry in the hash table, thus we never get to see the real
5461 symbol in a hash traversal. So look at it now. */
5462 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5463
5464 info = (struct bfd_link_info *) inf;
5465 htab = elf32_nios2_hash_table (info);
5466
5467 if (htab->root.dynamic_sections_created
5468 && h->plt.refcount > 0)
5469 {
5470 /* Make sure this symbol is output as a dynamic symbol.
5471 Undefined weak syms won't yet be marked as dynamic. */
5472 if (h->dynindx == -1
5473 && !h->forced_local
5474 && !bfd_elf_link_record_dynamic_symbol (info, h))
5475 return false;
5476
5477 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h))
5478 {
5479 asection *s = htab->root.splt;
5480
5481 /* Allocate room for the header. */
5482 if (s->size == 0)
5483 {
5484 if (bfd_link_pic (info))
5485 s->size = 24;
5486 else
5487 s->size = 28;
5488 }
5489
5490 h->plt.offset = s->size;
5491
5492 /* If this symbol is not defined in a regular file, and we are
5493 not generating a shared library, then set the symbol to this
5494 location in the .plt. This is required to make function
5495 pointers compare as equal between the normal executable and
5496 the shared library. */
5497 if (! bfd_link_pic (info)
5498 && !h->def_regular)
5499 {
5500 h->root.u.def.section = s;
5501 h->root.u.def.value = h->plt.offset;
5502 }
5503
5504 /* Make room for this entry. */
5505 s->size += 12;
5506
5507 /* We also need to make an entry in the .rela.plt section. */
5508 htab->root.srelplt->size += sizeof (Elf32_External_Rela);
5509
5510 /* And the .got.plt section. */
5511 htab->root.sgotplt->size += 4;
5512 }
5513 else
5514 {
5515 h->plt.offset = (bfd_vma) -1;
5516 h->needs_plt = 0;
5517 }
5518 }
5519 else
5520 {
5521 h->plt.offset = (bfd_vma) -1;
5522 h->needs_plt = 0;
5523 }
5524
5525 eh = (struct elf32_nios2_link_hash_entry *) h;
5526 use_plt = (eh->got_types_used == CALL_USED
5527 && h->plt.offset != (bfd_vma) -1);
5528
5529 if (h->got.refcount > 0)
5530 {
5531 asection *s;
5532 bool dyn;
5533 int tls_type = eh->tls_type;
5534 int indx;
5535
5536 /* Make sure this symbol is output as a dynamic symbol.
5537 Undefined weak syms won't yet be marked as dynamic. */
5538 if (h->dynindx == -1
5539 && !h->forced_local
5540 && !bfd_elf_link_record_dynamic_symbol (info, h))
5541 return false;
5542
5543 s = htab->root.sgot;
5544 h->got.offset = s->size;
5545
5546 if (tls_type == GOT_UNKNOWN)
5547 abort ();
5548
5549 if (tls_type == GOT_NORMAL)
5550 /* Non-TLS symbols need one GOT slot. */
5551 s->size += 4;
5552 else
5553 {
5554 if (tls_type & GOT_TLS_GD)
5555 /* R_NIOS2_TLS_GD16 needs 2 consecutive GOT slots. */
5556 s->size += 8;
5557 if (tls_type & GOT_TLS_IE)
5558 /* R_NIOS2_TLS_IE16 needs one GOT slot. */
5559 s->size += 4;
5560 }
5561
5562 dyn = htab->root.dynamic_sections_created;
5563
5564 indx = 0;
5565 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
5566 && (!bfd_link_pic (info)
5567 || !SYMBOL_REFERENCES_LOCAL (info, h)))
5568 indx = h->dynindx;
5569
5570 if (tls_type != GOT_NORMAL
5571 && (bfd_link_pic (info) || indx != 0)
5572 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
5573 || h->root.type != bfd_link_hash_undefweak))
5574 {
5575 if (tls_type & GOT_TLS_IE)
5576 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5577
5578 if (tls_type & GOT_TLS_GD)
5579 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5580
5581 if ((tls_type & GOT_TLS_GD) && indx != 0)
5582 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5583 }
5584 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
5585 || h->root.type != bfd_link_hash_undefweak)
5586 && !use_plt
5587 && (bfd_link_pic (info)
5588 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
5589 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5590 }
5591 else
5592 h->got.offset = (bfd_vma) -1;
5593
5594 if (h->dyn_relocs == NULL)
5595 return true;
5596
5597 /* In the shared -Bsymbolic case, discard space allocated for
5598 dynamic pc-relative relocs against symbols which turn out to be
5599 defined in regular objects. For the normal shared case, discard
5600 space for pc-relative relocs that have become local due to symbol
5601 visibility changes. */
5602
5603 if (bfd_link_pic (info))
5604 {
5605 if (h->def_regular
5606 && (h->forced_local || SYMBOLIC_BIND (info, h)))
5607 {
5608 struct elf_dyn_relocs **pp;
5609
5610 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
5611 {
5612 p->count -= p->pc_count;
5613 p->pc_count = 0;
5614 if (p->count == 0)
5615 *pp = p->next;
5616 else
5617 pp = &p->next;
5618 }
5619 }
5620
5621 /* Also discard relocs on undefined weak syms with non-default
5622 visibility. */
5623 if (h->dyn_relocs != NULL
5624 && h->root.type == bfd_link_hash_undefweak)
5625 {
5626 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
5627 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
5628 h->dyn_relocs = NULL;
5629
5630 /* Make sure undefined weak symbols are output as a dynamic
5631 symbol in PIEs. */
5632 else if (h->dynindx == -1
5633 && !h->forced_local
5634 && !bfd_elf_link_record_dynamic_symbol (info, h))
5635 return false;
5636 }
5637 }
5638 else
5639 {
5640 /* For the non-shared case, discard space for relocs against
5641 symbols which turn out to need copy relocs or are not
5642 dynamic. */
5643
5644 if (!h->non_got_ref
5645 && ((h->def_dynamic && !h->def_regular)
5646 || (htab->root.dynamic_sections_created
5647 && (h->root.type == bfd_link_hash_undefweak
5648 || h->root.type == bfd_link_hash_undefined))))
5649 {
5650 /* Make sure this symbol is output as a dynamic symbol.
5651 Undefined weak syms won't yet be marked as dynamic. */
5652 if (h->dynindx == -1
5653 && !h->forced_local
5654 && !bfd_elf_link_record_dynamic_symbol (info, h))
5655 return false;
5656
5657 /* If that succeeded, we know we'll be keeping all the
5658 relocs. */
5659 if (h->dynindx != -1)
5660 goto keep;
5661 }
5662
5663 h->dyn_relocs = NULL;
5664
5665 keep: ;
5666 }
5667
5668 /* Finally, allocate space. */
5669 for (p = h->dyn_relocs; p != NULL; p = p->next)
5670 {
5671 asection *sreloc = elf_section_data (p->sec)->sreloc;
5672 sreloc->size += p->count * sizeof (Elf32_External_Rela);
5673 }
5674
5675 return true;
5676 }
5677
5678 /* Implement elf_backend_late_size_sections:
5679 Set the sizes of the dynamic sections. */
5680 static bool
5681 nios2_elf32_late_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
5682 struct bfd_link_info *info)
5683 {
5684 bfd *dynobj;
5685 asection *s;
5686 bool relocs;
5687 bfd *ibfd;
5688 struct elf32_nios2_link_hash_table *htab;
5689
5690 htab = elf32_nios2_hash_table (info);
5691 dynobj = htab->root.dynobj;
5692 if (dynobj == NULL)
5693 return true;
5694
5695 htab->res_n_size = 0;
5696 if (htab->root.dynamic_sections_created)
5697 {
5698 /* Set the contents of the .interp section to the interpreter. */
5699 if (bfd_link_executable (info) && !info->nointerp)
5700 {
5701 s = bfd_get_linker_section (dynobj, ".interp");
5702 BFD_ASSERT (s != NULL);
5703 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
5704 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
5705 }
5706 }
5707 else
5708 {
5709 /* We may have created entries in the .rela.got section.
5710 However, if we are not creating the dynamic sections, we will
5711 not actually use these entries. Reset the size of .rela.got,
5712 which will cause it to get stripped from the output file
5713 below. */
5714 s = htab->root.srelgot;
5715 if (s != NULL)
5716 s->size = 0;
5717 }
5718
5719 /* Set up .got offsets for local syms, and space for local dynamic
5720 relocs. */
5721 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5722 {
5723 bfd_signed_vma *local_got;
5724 bfd_signed_vma *end_local_got;
5725 char *local_tls_type;
5726 bfd_size_type locsymcount;
5727 Elf_Internal_Shdr *symtab_hdr;
5728 asection *srel;
5729
5730 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
5731 continue;
5732
5733 for (s = ibfd->sections; s != NULL; s = s->next)
5734 {
5735 struct elf_dyn_relocs *p;
5736
5737 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
5738 {
5739 if (!bfd_is_abs_section (p->sec)
5740 && bfd_is_abs_section (p->sec->output_section))
5741 {
5742 /* Input section has been discarded, either because
5743 it is a copy of a linkonce section or due to
5744 linker script /DISCARD/, so we'll be discarding
5745 the relocs too. */
5746 }
5747 else if (p->count != 0)
5748 {
5749 srel = elf_section_data (p->sec)->sreloc;
5750 srel->size += p->count * sizeof (Elf32_External_Rela);
5751 }
5752 }
5753 }
5754
5755 local_got = elf_local_got_refcounts (ibfd);
5756 if (!local_got)
5757 continue;
5758
5759 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
5760 locsymcount = symtab_hdr->sh_info;
5761 end_local_got = local_got + locsymcount;
5762 local_tls_type = elf32_nios2_local_got_tls_type (ibfd);
5763 s = htab->root.sgot;
5764 srel = htab->root.srelgot;
5765 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
5766 {
5767 if (*local_got > 0)
5768 {
5769 *local_got = s->size;
5770 if (*local_tls_type & GOT_TLS_GD)
5771 /* TLS_GD relocs need an 8-byte structure in the GOT. */
5772 s->size += 8;
5773 if (*local_tls_type & GOT_TLS_IE)
5774 s->size += 4;
5775 if (*local_tls_type == GOT_NORMAL)
5776 s->size += 4;
5777
5778 if (bfd_link_pic (info) || *local_tls_type == GOT_TLS_GD)
5779 srel->size += sizeof (Elf32_External_Rela);
5780 }
5781 else
5782 *local_got = (bfd_vma) -1;
5783 }
5784 }
5785
5786 if (htab->tls_ldm_got.refcount > 0)
5787 {
5788 /* Allocate two GOT entries and one dynamic relocation (if necessary)
5789 for R_NIOS2_TLS_LDM16 relocations. */
5790 htab->tls_ldm_got.offset = htab->root.sgot->size;
5791 htab->root.sgot->size += 8;
5792 if (bfd_link_pic (info))
5793 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5794 }
5795 else
5796 htab->tls_ldm_got.offset = -1;
5797
5798 /* Allocate global sym .plt and .got entries, and space for global
5799 sym dynamic relocs. */
5800 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info);
5801
5802 if (htab->root.dynamic_sections_created)
5803 {
5804 /* If the .got section is more than 0x8000 bytes, we add
5805 0x8000 to the value of _gp_got, so that 16-bit relocations
5806 have a greater chance of working. */
5807 if (htab->root.sgot->size >= 0x8000
5808 && htab->h_gp_got->root.u.def.value == 0)
5809 htab->h_gp_got->root.u.def.value = 0x8000;
5810 }
5811
5812 /* The check_relocs and adjust_dynamic_symbol entry points have
5813 determined the sizes of the various dynamic sections. Allocate
5814 memory for them. */
5815 relocs = false;
5816 for (s = dynobj->sections; s != NULL; s = s->next)
5817 {
5818 const char *name;
5819
5820 if ((s->flags & SEC_LINKER_CREATED) == 0)
5821 continue;
5822
5823 /* It's OK to base decisions on the section name, because none
5824 of the dynobj section names depend upon the input files. */
5825 name = bfd_section_name (s);
5826
5827 if (startswith (name, ".rela"))
5828 {
5829 if (s->size != 0)
5830 {
5831 if (s != htab->root.srelplt)
5832 relocs = true;
5833
5834 /* We use the reloc_count field as a counter if we need
5835 to copy relocs into the output file. */
5836 s->reloc_count = 0;
5837 }
5838 }
5839 else if (s == htab->root.splt)
5840 {
5841 /* Correct for the number of res_N branches. */
5842 if (s->size != 0 && !bfd_link_pic (info))
5843 {
5844 htab->res_n_size = (s->size - 28) / 3;
5845 s->size += htab->res_n_size;
5846 }
5847 }
5848 else if (s != htab->sbss
5849 && s != htab->root.sgot
5850 && s != htab->root.sgotplt
5851 && s != htab->root.sdynbss
5852 && s != htab->root.sdynrelro)
5853 /* It's not one of our sections, so don't allocate space. */
5854 continue;
5855
5856 if (s->size == 0)
5857 {
5858 s->flags |= SEC_EXCLUDE;
5859 continue;
5860 }
5861
5862 if ((s->flags & SEC_HAS_CONTENTS) == 0)
5863 continue;
5864
5865 /* Allocate memory for the section contents. */
5866 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
5867 if (s->contents == NULL)
5868 return false;
5869 }
5870
5871 /* Adjust dynamic symbols that point to the plt to account for the
5872 now-known number of resN slots. */
5873 if (htab->res_n_size)
5874 elf_link_hash_traverse (& htab->root, adjust_dynrelocs, info);
5875
5876 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
5877 }
5878
5879 /* Free the derived linker hash table. */
5880 static void
5881 nios2_elf32_link_hash_table_free (bfd *obfd)
5882 {
5883 struct elf32_nios2_link_hash_table *htab
5884 = (struct elf32_nios2_link_hash_table *) obfd->link.hash;
5885
5886 bfd_hash_table_free (&htab->bstab);
5887 _bfd_elf_link_hash_table_free (obfd);
5888 }
5889
5890 /* Implement bfd_elf32_bfd_link_hash_table_create. */
5891 static struct bfd_link_hash_table *
5892 nios2_elf32_link_hash_table_create (bfd *abfd)
5893 {
5894 struct elf32_nios2_link_hash_table *ret;
5895 size_t amt = sizeof (struct elf32_nios2_link_hash_table);
5896
5897 ret = bfd_zmalloc (amt);
5898 if (ret == NULL)
5899 return NULL;
5900
5901 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
5902 link_hash_newfunc,
5903 sizeof (struct
5904 elf32_nios2_link_hash_entry),
5905 NIOS2_ELF_DATA))
5906 {
5907 free (ret);
5908 return NULL;
5909 }
5910
5911 /* Init the stub hash table too. */
5912 if (!bfd_hash_table_init (&ret->bstab, stub_hash_newfunc,
5913 sizeof (struct elf32_nios2_stub_hash_entry)))
5914 {
5915 _bfd_elf_link_hash_table_free (abfd);
5916 return NULL;
5917 }
5918 ret->root.root.hash_table_free = nios2_elf32_link_hash_table_free;
5919
5920 return &ret->root.root;
5921 }
5922
5923 /* Implement elf_backend_reloc_type_class. */
5924 static enum elf_reloc_type_class
5925 nios2_elf32_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5926 const asection *rel_sec ATTRIBUTE_UNUSED,
5927 const Elf_Internal_Rela *rela)
5928 {
5929 switch ((int) ELF32_R_TYPE (rela->r_info))
5930 {
5931 case R_NIOS2_RELATIVE:
5932 return reloc_class_relative;
5933 case R_NIOS2_JUMP_SLOT:
5934 return reloc_class_plt;
5935 case R_NIOS2_COPY:
5936 return reloc_class_copy;
5937 default:
5938 return reloc_class_normal;
5939 }
5940 }
5941
5942 /* Return 1 if target is one of ours. */
5943 static bool
5944 is_nios2_elf_target (const struct bfd_target *targ)
5945 {
5946 return (targ == &nios2_elf32_le_vec
5947 || targ == &nios2_elf32_be_vec);
5948 }
5949
5950 /* Implement elf_backend_add_symbol_hook.
5951 This hook is called by the linker when adding symbols from an object
5952 file. We use it to put .comm items in .sbss, and not .bss. */
5953 static bool
5954 nios2_elf_add_symbol_hook (bfd *abfd,
5955 struct bfd_link_info *info,
5956 Elf_Internal_Sym *sym,
5957 const char **namep ATTRIBUTE_UNUSED,
5958 flagword *flagsp ATTRIBUTE_UNUSED,
5959 asection **secp,
5960 bfd_vma *valp)
5961 {
5962 if (sym->st_shndx == SHN_COMMON
5963 && !bfd_link_relocatable (info)
5964 && sym->st_size <= elf_gp_size (abfd)
5965 && is_nios2_elf_target (info->output_bfd->xvec))
5966 {
5967 /* Common symbols less than or equal to -G nn bytes are automatically
5968 put into .sbss. */
5969 struct elf32_nios2_link_hash_table *htab;
5970
5971 htab = elf32_nios2_hash_table (info);
5972 if (htab->sbss == NULL)
5973 {
5974 flagword flags = SEC_IS_COMMON | SEC_SMALL_DATA | SEC_LINKER_CREATED;
5975
5976 if (htab->root.dynobj == NULL)
5977 htab->root.dynobj = abfd;
5978
5979 htab->sbss = bfd_make_section_anyway_with_flags (htab->root.dynobj,
5980 ".sbss", flags);
5981 if (htab->sbss == NULL)
5982 return false;
5983 }
5984
5985 *secp = htab->sbss;
5986 *valp = sym->st_size;
5987 }
5988
5989 return true;
5990 }
5991
5992 /* Implement elf_backend_can_make_relative_eh_frame:
5993 Decide whether to attempt to turn absptr or lsda encodings in
5994 shared libraries into pcrel within the given input section. */
5995 static bool
5996 nios2_elf32_can_make_relative_eh_frame (bfd *input_bfd ATTRIBUTE_UNUSED,
5997 struct bfd_link_info *info
5998 ATTRIBUTE_UNUSED,
5999 asection *eh_frame_section
6000 ATTRIBUTE_UNUSED)
6001 {
6002 /* We can't use PC-relative encodings in the .eh_frame section. */
6003 return false;
6004 }
6005
6006 /* Implement elf_backend_special_sections. */
6007 const struct bfd_elf_special_section elf32_nios2_special_sections[] =
6008 {
6009 { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS,
6010 SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL },
6011 { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS,
6012 SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL },
6013 { NULL, 0, 0, 0, 0 }
6014 };
6015
6016 #define ELF_ARCH bfd_arch_nios2
6017 #define ELF_TARGET_ID NIOS2_ELF_DATA
6018 #define ELF_MACHINE_CODE EM_ALTERA_NIOS2
6019
6020 /* The Nios II MMU uses a 4K page size. */
6021
6022 #define ELF_MAXPAGESIZE 0x1000
6023
6024 #define bfd_elf32_bfd_link_hash_table_create \
6025 nios2_elf32_link_hash_table_create
6026
6027 #define bfd_elf32_bfd_merge_private_bfd_data \
6028 nios2_elf32_merge_private_bfd_data
6029
6030 /* Relocation table lookup macros. */
6031
6032 #define bfd_elf32_bfd_reloc_type_lookup nios2_elf32_bfd_reloc_type_lookup
6033 #define bfd_elf32_bfd_reloc_name_lookup nios2_elf32_bfd_reloc_name_lookup
6034
6035 /* JUMP_TABLE_LINK macros. */
6036
6037 /* elf_info_to_howto (using RELA relocations). */
6038
6039 #define elf_info_to_howto nios2_elf32_info_to_howto
6040
6041 /* elf backend functions. */
6042
6043 #define elf_backend_can_gc_sections 1
6044 #define elf_backend_can_refcount 1
6045 #define elf_backend_plt_readonly 1
6046 #define elf_backend_want_got_plt 1
6047 #define elf_backend_want_dynrelro 1
6048 #define elf_backend_rela_normal 1
6049 #define elf_backend_dtrel_excludes_plt 1
6050
6051 #define elf_backend_relocate_section nios2_elf32_relocate_section
6052 #define elf_backend_section_flags nios2_elf32_section_flags
6053 #define elf_backend_fake_sections nios2_elf32_fake_sections
6054 #define elf_backend_check_relocs nios2_elf32_check_relocs
6055
6056 #define elf_backend_gc_mark_hook nios2_elf32_gc_mark_hook
6057 #define elf_backend_create_dynamic_sections \
6058 nios2_elf32_create_dynamic_sections
6059 #define elf_backend_finish_dynamic_symbol nios2_elf32_finish_dynamic_symbol
6060 #define elf_backend_finish_dynamic_sections \
6061 nios2_elf32_finish_dynamic_sections
6062 #define elf_backend_adjust_dynamic_symbol nios2_elf32_adjust_dynamic_symbol
6063 #define elf_backend_reloc_type_class nios2_elf32_reloc_type_class
6064 #define elf_backend_late_size_sections nios2_elf32_late_size_sections
6065 #define elf_backend_add_symbol_hook nios2_elf_add_symbol_hook
6066 #define elf_backend_copy_indirect_symbol nios2_elf32_copy_indirect_symbol
6067 #define elf_backend_object_p nios2_elf32_object_p
6068
6069 #define elf_backend_grok_prstatus nios2_grok_prstatus
6070 #define elf_backend_grok_psinfo nios2_grok_psinfo
6071
6072 #undef elf_backend_can_make_relative_eh_frame
6073 #define elf_backend_can_make_relative_eh_frame \
6074 nios2_elf32_can_make_relative_eh_frame
6075
6076 #define elf_backend_special_sections elf32_nios2_special_sections
6077
6078 #define TARGET_LITTLE_SYM nios2_elf32_le_vec
6079 #define TARGET_LITTLE_NAME "elf32-littlenios2"
6080 #define TARGET_BIG_SYM nios2_elf32_be_vec
6081 #define TARGET_BIG_NAME "elf32-bignios2"
6082
6083 #define elf_backend_got_header_size 12
6084 #define elf_backend_default_execstack 0
6085
6086 #include "elf32-target.h"
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