1 /* 32-bit ELF support for Nios II.
2 Copyright (C) 2012-2022 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 *
lookup_howto(unsigned int rtype,bfd * abfd)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
nios2_elf32_install_imm16(asection * sec,bfd_vma offset,bfd_vma value)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_ASSERT (value <= 0xffff || ((bfd_signed_vma) value) >= -0xffff);
1882
1883 bfd_put_32 (sec->owner, word | ((value & 0xffff) << 6),
1884 sec->contents + offset);
1885 }
1886
1887 /* Install COUNT 32-bit values DATA starting at offset OFFSET into
1888 section SEC. */
1889 static void
nios2_elf32_install_data(asection * sec,const bfd_vma * data,bfd_vma offset,int count)1890 nios2_elf32_install_data (asection *sec, const bfd_vma *data, bfd_vma offset,
1891 int count)
1892 {
1893 while (count--)
1894 {
1895 bfd_put_32 (sec->owner, *data, sec->contents + offset);
1896 offset += 4;
1897 ++data;
1898 }
1899 }
1900
1901 /* The usual way of loading a 32-bit constant into a Nios II register is to
1902 load the high 16 bits in one instruction and then add the low 16 bits with
1903 a signed add. This means that the high halfword needs to be adjusted to
1904 compensate for the sign bit of the low halfword. This function returns the
1905 adjusted high halfword for a given 32-bit constant. */
1906 static
hiadj(bfd_vma symbol_value)1907 bfd_vma hiadj (bfd_vma symbol_value)
1908 {
1909 return ((symbol_value + 0x8000) >> 16) & 0xffff;
1910 }
1911
1912 /* Implement elf_backend_grok_prstatus:
1913 Support for core dump NOTE sections. */
1914 static bool
nios2_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)1915 nios2_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
1916 {
1917 int offset;
1918 size_t size;
1919
1920 switch (note->descsz)
1921 {
1922 default:
1923 return false;
1924
1925 case 212: /* Linux/Nios II */
1926 /* pr_cursig */
1927 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
1928
1929 /* pr_pid */
1930 elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
1931
1932 /* pr_reg */
1933 offset = 72;
1934 size = 136;
1935
1936 break;
1937 }
1938
1939 /* Make a ".reg/999" section. */
1940 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
1941 size, note->descpos + offset);
1942 }
1943
1944 /* Implement elf_backend_grok_psinfo. */
1945 static bool
nios2_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)1946 nios2_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
1947 {
1948 switch (note->descsz)
1949 {
1950 default:
1951 return false;
1952
1953 case 124: /* Linux/Nios II elf_prpsinfo */
1954 elf_tdata (abfd)->core->program
1955 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
1956 elf_tdata (abfd)->core->command
1957 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
1958 }
1959
1960 /* Note that for some reason, a spurious space is tacked
1961 onto the end of the args in some (at least one anyway)
1962 implementations, so strip it off if it exists. */
1963
1964 {
1965 char *command = elf_tdata (abfd)->core->command;
1966 int n = strlen (command);
1967
1968 if (0 < n && command[n - 1] == ' ')
1969 command[n - 1] = '\0';
1970 }
1971
1972 return true;
1973 }
1974
1975 /* Assorted hash table functions. */
1976
1977 /* Initialize an entry in the stub hash table. */
1978 static struct bfd_hash_entry *
stub_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)1979 stub_hash_newfunc (struct bfd_hash_entry *entry,
1980 struct bfd_hash_table *table,
1981 const char *string)
1982 {
1983 /* Allocate the structure if it has not already been allocated by a
1984 subclass. */
1985 if (entry == NULL)
1986 {
1987 entry = bfd_hash_allocate (table,
1988 sizeof (struct elf32_nios2_stub_hash_entry));
1989 if (entry == NULL)
1990 return entry;
1991 }
1992
1993 /* Call the allocation method of the superclass. */
1994 entry = bfd_hash_newfunc (entry, table, string);
1995 if (entry != NULL)
1996 {
1997 struct elf32_nios2_stub_hash_entry *hsh;
1998
1999 /* Initialize the local fields. */
2000 hsh = (struct elf32_nios2_stub_hash_entry *) entry;
2001 hsh->stub_sec = NULL;
2002 hsh->stub_offset = 0;
2003 hsh->target_value = 0;
2004 hsh->target_section = NULL;
2005 hsh->stub_type = nios2_stub_none;
2006 hsh->hh = NULL;
2007 hsh->id_sec = NULL;
2008 }
2009
2010 return entry;
2011 }
2012
2013 /* Create an entry in a Nios II ELF linker hash table. */
2014 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)2015 link_hash_newfunc (struct bfd_hash_entry *entry,
2016 struct bfd_hash_table *table, const char *string)
2017 {
2018 /* Allocate the structure if it has not already been allocated by a
2019 subclass. */
2020 if (entry == NULL)
2021 {
2022 entry = bfd_hash_allocate (table,
2023 sizeof (struct elf32_nios2_link_hash_entry));
2024 if (entry == NULL)
2025 return entry;
2026 }
2027
2028 /* Call the allocation method of the superclass. */
2029 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
2030 if (entry)
2031 {
2032 struct elf32_nios2_link_hash_entry *eh;
2033
2034 eh = (struct elf32_nios2_link_hash_entry *) entry;
2035 eh->hsh_cache = NULL;
2036 eh->tls_type = GOT_UNKNOWN;
2037 eh->got_types_used = 0;
2038 }
2039
2040 return entry;
2041 }
2042
2043 /* Section name for stubs is the associated section name plus this
2044 string. */
2045 #define STUB_SUFFIX ".stub"
2046
2047 /* Build a name for an entry in the stub hash table. */
2048 static char *
nios2_stub_name(const asection * input_section,const asection * sym_sec,const struct elf32_nios2_link_hash_entry * hh,const Elf_Internal_Rela * rel,enum elf32_nios2_stub_type stub_type)2049 nios2_stub_name (const asection *input_section,
2050 const asection *sym_sec,
2051 const struct elf32_nios2_link_hash_entry *hh,
2052 const Elf_Internal_Rela *rel,
2053 enum elf32_nios2_stub_type stub_type)
2054 {
2055 char *stub_name;
2056 bfd_size_type len;
2057 char stubpos = (stub_type == nios2_stub_call26_before) ? 'b' : 'a';
2058
2059 if (hh)
2060 {
2061 len = 8 + 1 + 1 + 1+ strlen (hh->root.root.root.string) + 1 + 8 + 1;
2062 stub_name = bfd_malloc (len);
2063 if (stub_name != NULL)
2064 {
2065 sprintf (stub_name, "%08x_%c_%s+%x",
2066 input_section->id & 0xffffffff,
2067 stubpos,
2068 hh->root.root.root.string,
2069 (int) rel->r_addend & 0xffffffff);
2070 }
2071 }
2072 else
2073 {
2074 len = 8 + 1 + 1 + 1+ 8 + 1 + 8 + 1 + 8 + 1;
2075 stub_name = bfd_malloc (len);
2076 if (stub_name != NULL)
2077 {
2078 sprintf (stub_name, "%08x_%c_%x:%x+%x",
2079 input_section->id & 0xffffffff,
2080 stubpos,
2081 sym_sec->id & 0xffffffff,
2082 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff,
2083 (int) rel->r_addend & 0xffffffff);
2084 }
2085 }
2086 return stub_name;
2087 }
2088
2089 /* Look up an entry in the stub hash. Stub entries are cached because
2090 creating the stub name takes a bit of time. */
2091 static struct elf32_nios2_stub_hash_entry *
nios2_get_stub_entry(const asection * input_section,const asection * sym_sec,struct elf32_nios2_link_hash_entry * hh,const Elf_Internal_Rela * rel,struct elf32_nios2_link_hash_table * htab,enum elf32_nios2_stub_type stub_type)2092 nios2_get_stub_entry (const asection *input_section,
2093 const asection *sym_sec,
2094 struct elf32_nios2_link_hash_entry *hh,
2095 const Elf_Internal_Rela *rel,
2096 struct elf32_nios2_link_hash_table *htab,
2097 enum elf32_nios2_stub_type stub_type)
2098 {
2099 struct elf32_nios2_stub_hash_entry *hsh;
2100 const asection *id_sec;
2101
2102 /* If this input section is part of a group of sections sharing one
2103 stub section, then use the id of the first/last section in the group,
2104 depending on the stub section placement relative to the group.
2105 Stub names need to include a section id, as there may well be
2106 more than one stub used to reach say, printf, and we need to
2107 distinguish between them. */
2108 if (stub_type == nios2_stub_call26_before)
2109 id_sec = htab->stub_group[input_section->id].first_sec;
2110 else
2111 id_sec = htab->stub_group[input_section->id].last_sec;
2112
2113 if (hh != NULL && hh->hsh_cache != NULL
2114 && hh->hsh_cache->hh == hh
2115 && hh->hsh_cache->id_sec == id_sec
2116 && hh->hsh_cache->stub_type == stub_type)
2117 {
2118 hsh = hh->hsh_cache;
2119 }
2120 else
2121 {
2122 char *stub_name;
2123
2124 stub_name = nios2_stub_name (id_sec, sym_sec, hh, rel, stub_type);
2125 if (stub_name == NULL)
2126 return NULL;
2127
2128 hsh = nios2_stub_hash_lookup (&htab->bstab,
2129 stub_name, false, false);
2130
2131 if (hh != NULL)
2132 hh->hsh_cache = hsh;
2133
2134 free (stub_name);
2135 }
2136
2137 return hsh;
2138 }
2139
2140 /* Add a new stub entry to the stub hash. Not all fields of the new
2141 stub entry are initialised. */
2142 static struct elf32_nios2_stub_hash_entry *
nios2_add_stub(const char * stub_name,asection * section,struct elf32_nios2_link_hash_table * htab,enum elf32_nios2_stub_type stub_type)2143 nios2_add_stub (const char *stub_name,
2144 asection *section,
2145 struct elf32_nios2_link_hash_table *htab,
2146 enum elf32_nios2_stub_type stub_type)
2147 {
2148 asection *link_sec;
2149 asection *stub_sec;
2150 asection **secptr, **linkptr;
2151 struct elf32_nios2_stub_hash_entry *hsh;
2152 bool afterp;
2153
2154 if (stub_type == nios2_stub_call26_before)
2155 {
2156 link_sec = htab->stub_group[section->id].first_sec;
2157 secptr = &(htab->stub_group[section->id].first_stub_sec);
2158 linkptr = &(htab->stub_group[link_sec->id].first_stub_sec);
2159 afterp = false;
2160 }
2161 else
2162 {
2163 link_sec = htab->stub_group[section->id].last_sec;
2164 secptr = &(htab->stub_group[section->id].last_stub_sec);
2165 linkptr = &(htab->stub_group[link_sec->id].last_stub_sec);
2166 afterp = true;
2167 }
2168 stub_sec = *secptr;
2169 if (stub_sec == NULL)
2170 {
2171 stub_sec = *linkptr;
2172 if (stub_sec == NULL)
2173 {
2174 size_t namelen;
2175 bfd_size_type len;
2176 char *s_name;
2177
2178 namelen = strlen (link_sec->name);
2179 len = namelen + sizeof (STUB_SUFFIX);
2180 s_name = bfd_alloc (htab->stub_bfd, len);
2181 if (s_name == NULL)
2182 return NULL;
2183
2184 memcpy (s_name, link_sec->name, namelen);
2185 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
2186
2187 stub_sec = (*htab->add_stub_section) (s_name, link_sec, afterp);
2188 if (stub_sec == NULL)
2189 return NULL;
2190 *linkptr = stub_sec;
2191 }
2192 *secptr = stub_sec;
2193 }
2194
2195 /* Enter this entry into the linker stub hash table. */
2196 hsh = nios2_stub_hash_lookup (&htab->bstab, stub_name,
2197 true, false);
2198 if (hsh == NULL)
2199 {
2200 /* xgettext:c-format */
2201 _bfd_error_handler (_("%pB: cannot create stub entry %s"),
2202 section->owner,
2203 stub_name);
2204 return NULL;
2205 }
2206
2207 hsh->stub_sec = stub_sec;
2208 hsh->stub_offset = 0;
2209 hsh->id_sec = link_sec;
2210 return hsh;
2211 }
2212
2213 /* Set up various things so that we can make a list of input sections
2214 for each output section included in the link. Returns -1 on error,
2215 0 when no stubs will be needed, and 1 on success. */
2216 int
nios2_elf32_setup_section_lists(bfd * output_bfd,struct bfd_link_info * info)2217 nios2_elf32_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info)
2218 {
2219 bfd *input_bfd;
2220 unsigned int bfd_count;
2221 unsigned int top_id, top_index;
2222 asection *section;
2223 asection **input_list, **list;
2224 size_t amt;
2225 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2226
2227 /* Count the number of input BFDs and find the top input section id. */
2228 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
2229 input_bfd != NULL;
2230 input_bfd = input_bfd->link.next)
2231 {
2232 bfd_count += 1;
2233 for (section = input_bfd->sections;
2234 section != NULL;
2235 section = section->next)
2236 {
2237 if (top_id < section->id)
2238 top_id = section->id;
2239 }
2240 }
2241
2242 htab->bfd_count = bfd_count;
2243
2244 amt = sizeof (struct map_stub) * (top_id + 1);
2245 htab->stub_group = bfd_zmalloc (amt);
2246 if (htab->stub_group == NULL)
2247 return -1;
2248
2249 /* We can't use output_bfd->section_count here to find the top output
2250 section index as some sections may have been removed, and
2251 strip_excluded_output_sections doesn't renumber the indices. */
2252 for (section = output_bfd->sections, top_index = 0;
2253 section != NULL;
2254 section = section->next)
2255 {
2256 if (top_index < section->index)
2257 top_index = section->index;
2258 }
2259
2260 htab->top_index = top_index;
2261 amt = sizeof (asection *) * (top_index + 1);
2262 input_list = bfd_malloc (amt);
2263 htab->input_list = input_list;
2264 if (input_list == NULL)
2265 return -1;
2266
2267 /* For sections we aren't interested in, mark their entries with a
2268 value we can check later. */
2269 list = input_list + top_index;
2270 do
2271 *list = bfd_abs_section_ptr;
2272 while (list-- != input_list);
2273
2274 for (section = output_bfd->sections;
2275 section != NULL;
2276 section = section->next)
2277 {
2278 /* FIXME: This is a bit of hack. Currently our .ctors and .dtors
2279 * have PC relative relocs in them but no code flag set. */
2280 if (((section->flags & SEC_CODE) != 0) ||
2281 strcmp(".ctors", section->name) ||
2282 strcmp(".dtors", section->name))
2283 input_list[section->index] = NULL;
2284 }
2285
2286 return 1;
2287 }
2288
2289 /* The linker repeatedly calls this function for each input section,
2290 in the order that input sections are linked into output sections.
2291 Build lists of input sections to determine groupings between which
2292 we may insert linker stubs. */
2293 void
nios2_elf32_next_input_section(struct bfd_link_info * info,asection * isec)2294 nios2_elf32_next_input_section (struct bfd_link_info *info, asection *isec)
2295 {
2296 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2297
2298 if (isec->output_section->index <= htab->top_index)
2299 {
2300 asection **list = htab->input_list + isec->output_section->index;
2301 if (*list != bfd_abs_section_ptr)
2302 {
2303 /* Steal the last_sec pointer for our list.
2304 This happens to make the list in reverse order,
2305 which is what we want. */
2306 htab->stub_group[isec->id].last_sec = *list;
2307 *list = isec;
2308 }
2309 }
2310 }
2311
2312 /* Segment mask for CALL26 relocation relaxation. */
2313 #define CALL26_SEGMENT(x) ((x) & 0xf0000000)
2314
2315 /* Fudge factor for approximate maximum size of all stubs that might
2316 be inserted by the linker. This does not actually limit the number
2317 of stubs that might be inserted, and only affects strategy for grouping
2318 and placement of stubs. Perhaps this should be computed based on number
2319 of relocations seen, or be specifiable on the command line. */
2320 #define MAX_STUB_SECTION_SIZE 0xffff
2321
2322 /* See whether we can group stub sections together. Grouping stub
2323 sections may result in fewer stubs. More importantly, we need to
2324 put all .init* and .fini* stubs at the end of the .init or
2325 .fini output sections respectively, because glibc splits the
2326 _init and _fini functions into multiple parts. Putting a stub in
2327 the middle of a function is not a good idea.
2328 Rather than computing groups of a maximum fixed size, for Nios II
2329 CALL26 relaxation it makes more sense to compute the groups based on
2330 sections that fit within a 256MB address segment. Also do not allow
2331 a group to span more than one output section, since different output
2332 sections might correspond to different memory banks on a bare-metal
2333 target, etc. */
2334 static void
group_sections(struct elf32_nios2_link_hash_table * htab)2335 group_sections (struct elf32_nios2_link_hash_table *htab)
2336 {
2337 asection **list = htab->input_list + htab->top_index;
2338 do
2339 {
2340 /* The list is in reverse order so we'll search backwards looking
2341 for the first section that begins in the same memory segment,
2342 marking sections along the way to point at the tail for this
2343 group. */
2344 asection *tail = *list;
2345 if (tail == bfd_abs_section_ptr)
2346 continue;
2347 while (tail != NULL)
2348 {
2349 bfd_vma start = tail->output_section->vma + tail->output_offset;
2350 bfd_vma end = start + tail->size;
2351 bfd_vma segment = CALL26_SEGMENT (end);
2352 asection *prev;
2353
2354 if (segment != CALL26_SEGMENT (start)
2355 || segment != CALL26_SEGMENT (end + MAX_STUB_SECTION_SIZE))
2356 /* This section spans more than one memory segment, or is
2357 close enough to the end of the segment that adding stub
2358 sections before it might cause it to move so that it
2359 spans memory segments, or that stubs added at the end of
2360 this group might overflow into the next memory segment.
2361 Put it in a group by itself to localize the effects. */
2362 {
2363 prev = htab->stub_group[tail->id].last_sec;
2364 htab->stub_group[tail->id].last_sec = tail;
2365 htab->stub_group[tail->id].first_sec = tail;
2366 }
2367 else
2368 /* Collect more sections for this group. */
2369 {
2370 asection *curr, *first;
2371 for (curr = tail; ; curr = prev)
2372 {
2373 prev = htab->stub_group[curr->id].last_sec;
2374 if (!prev
2375 || tail->output_section != prev->output_section
2376 || (CALL26_SEGMENT (prev->output_section->vma
2377 + prev->output_offset)
2378 != segment))
2379 break;
2380 }
2381 first = curr;
2382 for (curr = tail; ; curr = prev)
2383 {
2384 prev = htab->stub_group[curr->id].last_sec;
2385 htab->stub_group[curr->id].last_sec = tail;
2386 htab->stub_group[curr->id].first_sec = first;
2387 if (curr == first)
2388 break;
2389 }
2390 }
2391
2392 /* Reset tail for the next group. */
2393 tail = prev;
2394 }
2395 }
2396 while (list-- != htab->input_list);
2397 free (htab->input_list);
2398 }
2399
2400 /* Determine the type of stub needed, if any, for a call. */
2401 static enum elf32_nios2_stub_type
nios2_type_of_stub(asection * input_sec,const Elf_Internal_Rela * rel,struct elf32_nios2_link_hash_entry * hh,struct elf32_nios2_link_hash_table * htab,bfd_vma destination,struct bfd_link_info * info ATTRIBUTE_UNUSED)2402 nios2_type_of_stub (asection *input_sec,
2403 const Elf_Internal_Rela *rel,
2404 struct elf32_nios2_link_hash_entry *hh,
2405 struct elf32_nios2_link_hash_table *htab,
2406 bfd_vma destination,
2407 struct bfd_link_info *info ATTRIBUTE_UNUSED)
2408 {
2409 bfd_vma location, segment, start, end;
2410 asection *s0, *s1, *s;
2411
2412 if (hh != NULL &&
2413 !(hh->root.root.type == bfd_link_hash_defined
2414 || hh->root.root.type == bfd_link_hash_defweak))
2415 return nios2_stub_none;
2416
2417 /* Determine where the call point is. */
2418 location = (input_sec->output_section->vma
2419 + input_sec->output_offset + rel->r_offset);
2420 segment = CALL26_SEGMENT (location);
2421
2422 /* Nios II CALL and JMPI instructions can transfer control to addresses
2423 within the same 256MB segment as the PC. */
2424 if (segment == CALL26_SEGMENT (destination))
2425 return nios2_stub_none;
2426
2427 /* Find the start and end addresses of the stub group. Also account for
2428 any already-created stub sections for this group. Note that for stubs
2429 in the end section, only the first instruction of the last stub
2430 (12 bytes long) needs to be within range. */
2431 s0 = htab->stub_group[input_sec->id].first_sec;
2432 s = htab->stub_group[s0->id].first_stub_sec;
2433 if (s != NULL && s->size > 0)
2434 start = s->output_section->vma + s->output_offset;
2435 else
2436 start = s0->output_section->vma + s0->output_offset;
2437
2438 s1 = htab->stub_group[input_sec->id].last_sec;
2439 s = htab->stub_group[s1->id].last_stub_sec;
2440 if (s != NULL && s->size > 0)
2441 end = s->output_section->vma + s->output_offset + s->size - 8;
2442 else
2443 end = s1->output_section->vma + s1->output_offset + s1->size;
2444
2445 BFD_ASSERT (start < end);
2446 BFD_ASSERT (start <= location);
2447 BFD_ASSERT (location < end);
2448
2449 /* Put stubs at the end of the group unless that is not a valid
2450 location and the beginning of the group is. It might be that
2451 neither the beginning nor end works if we have an input section
2452 so large that it spans multiple segment boundaries. In that
2453 case, punt; the end result will be a relocation overflow error no
2454 matter what we do here.
2455
2456 Note that adding stubs pushes up the addresses of all subsequent
2457 sections, so that stubs allocated on one pass through the
2458 relaxation loop may not be valid on the next pass. (E.g., we may
2459 allocate a stub at the beginning of the section on one pass and
2460 find that the call site has been bumped into the next memory
2461 segment on the next pass.) The important thing to note is that
2462 we never try to reclaim the space allocated to such unused stubs,
2463 so code size and section addresses can only increase with each
2464 iteration. Accounting for the start and end addresses of the
2465 already-created stub sections ensures that when the algorithm
2466 converges, it converges accurately, with the entire appropriate
2467 stub section accessible from the call site and not just the
2468 address at the start or end of the stub group proper. */
2469
2470 if (segment == CALL26_SEGMENT (end))
2471 return nios2_stub_call26_after;
2472 else if (segment == CALL26_SEGMENT (start))
2473 return nios2_stub_call26_before;
2474 else
2475 /* Perhaps this should be a dedicated error code. */
2476 return nios2_stub_none;
2477 }
2478
2479 static bool
nios2_build_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg ATTRIBUTE_UNUSED)2480 nios2_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
2481 {
2482 struct elf32_nios2_stub_hash_entry *hsh
2483 = (struct elf32_nios2_stub_hash_entry *) gen_entry;
2484 asection *stub_sec = hsh->stub_sec;
2485 bfd_vma sym_value;
2486 struct bfd_link_info *info;
2487
2488 info = (struct bfd_link_info *) in_arg;
2489
2490 /* Fail if the target section could not be assigned to an output
2491 section. The user should fix his linker script. */
2492 if (hsh->target_section->output_section == NULL
2493 && info->non_contiguous_regions)
2494 info->callbacks->einfo (_("%F%P: Could not assign '%pA' to an output section. "
2495 "Retry without --enable-non-contiguous-regions.\n"),
2496 hsh->target_section);
2497
2498 /* Make a note of the offset within the stubs for this entry. */
2499 hsh->stub_offset = stub_sec->size;
2500
2501 switch (hsh->stub_type)
2502 {
2503 case nios2_stub_call26_before:
2504 case nios2_stub_call26_after:
2505 /* A call26 stub looks like:
2506 orhi at, %hiadj(dest)
2507 addi at, at, %lo(dest)
2508 jmp at
2509 Note that call/jmpi instructions can't be used in PIC code
2510 so there is no reason for the stub to be PIC, either. */
2511 sym_value = (hsh->target_value
2512 + hsh->target_section->output_offset
2513 + hsh->target_section->output_section->vma
2514 + hsh->addend);
2515
2516 nios2_elf32_install_data (stub_sec, nios2_call26_stub_entry,
2517 hsh->stub_offset, 3);
2518 nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset,
2519 hiadj (sym_value));
2520 nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset + 4,
2521 (sym_value & 0xffff));
2522 stub_sec->size += 12;
2523 break;
2524 default:
2525 BFD_FAIL ();
2526 return false;
2527 }
2528
2529 return true;
2530 }
2531
2532 /* As above, but don't actually build the stub. Just bump offset so
2533 we know stub section sizes. */
2534 static bool
nios2_size_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg ATTRIBUTE_UNUSED)2535 nios2_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
2536 {
2537 struct elf32_nios2_stub_hash_entry *hsh
2538 = (struct elf32_nios2_stub_hash_entry *) gen_entry;
2539
2540 switch (hsh->stub_type)
2541 {
2542 case nios2_stub_call26_before:
2543 case nios2_stub_call26_after:
2544 hsh->stub_sec->size += 12;
2545 break;
2546 default:
2547 BFD_FAIL ();
2548 return false;
2549 }
2550 return true;
2551 }
2552
2553 /* Read in all local syms for all input bfds.
2554 Returns -1 on error, 0 otherwise. */
2555
2556 static int
get_local_syms(bfd * output_bfd ATTRIBUTE_UNUSED,bfd * input_bfd,struct bfd_link_info * info)2557 get_local_syms (bfd *output_bfd ATTRIBUTE_UNUSED, bfd *input_bfd,
2558 struct bfd_link_info *info)
2559 {
2560 unsigned int bfd_indx;
2561 Elf_Internal_Sym *local_syms, **all_local_syms;
2562 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2563
2564 /* We want to read in symbol extension records only once. To do this
2565 we need to read in the local symbols in parallel and save them for
2566 later use; so hold pointers to the local symbols in an array. */
2567 size_t amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
2568 all_local_syms = bfd_zmalloc (amt);
2569 htab->all_local_syms = all_local_syms;
2570 if (all_local_syms == NULL)
2571 return -1;
2572
2573 /* Walk over all the input BFDs, swapping in local symbols. */
2574 for (bfd_indx = 0;
2575 input_bfd != NULL;
2576 input_bfd = input_bfd->link.next, bfd_indx++)
2577 {
2578 Elf_Internal_Shdr *symtab_hdr;
2579
2580 /* We'll need the symbol table in a second. */
2581 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2582 if (symtab_hdr->sh_info == 0)
2583 continue;
2584
2585 /* We need an array of the local symbols attached to the input bfd. */
2586 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
2587 if (local_syms == NULL)
2588 {
2589 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
2590 symtab_hdr->sh_info, 0,
2591 NULL, NULL, NULL);
2592 /* Cache them for elf_link_input_bfd. */
2593 symtab_hdr->contents = (unsigned char *) local_syms;
2594 }
2595 if (local_syms == NULL)
2596 return -1;
2597
2598 all_local_syms[bfd_indx] = local_syms;
2599 }
2600
2601 return 0;
2602 }
2603
2604 /* Determine and set the size of the stub section for a final link. */
2605 bool
nios2_elf32_size_stubs(bfd * output_bfd,bfd * stub_bfd,struct bfd_link_info * info,asection * (* add_stub_section)(const char *,asection *,bool),void (* layout_sections_again)(void))2606 nios2_elf32_size_stubs (bfd *output_bfd, bfd *stub_bfd,
2607 struct bfd_link_info *info,
2608 asection *(*add_stub_section) (const char *,
2609 asection *, bool),
2610 void (*layout_sections_again) (void))
2611 {
2612 bool stub_changed = false;
2613 struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
2614
2615 /* Stash our params away. */
2616 htab->stub_bfd = stub_bfd;
2617 htab->add_stub_section = add_stub_section;
2618 htab->layout_sections_again = layout_sections_again;
2619
2620 /* FIXME: We only compute the section groups once. This could cause
2621 problems if adding a large stub section causes following sections,
2622 or parts of them, to move into another segment. However, this seems
2623 to be consistent with the way other back ends handle this.... */
2624 group_sections (htab);
2625
2626 if (get_local_syms (output_bfd, info->input_bfds, info))
2627 {
2628 if (htab->all_local_syms)
2629 goto error_ret_free_local;
2630 return false;
2631 }
2632
2633 while (1)
2634 {
2635 bfd *input_bfd;
2636 unsigned int bfd_indx;
2637 asection *stub_sec;
2638
2639 for (input_bfd = info->input_bfds, bfd_indx = 0;
2640 input_bfd != NULL;
2641 input_bfd = input_bfd->link.next, bfd_indx++)
2642 {
2643 Elf_Internal_Shdr *symtab_hdr;
2644 asection *section;
2645 Elf_Internal_Sym *local_syms;
2646
2647 /* We'll need the symbol table in a second. */
2648 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2649 if (symtab_hdr->sh_info == 0)
2650 continue;
2651
2652 local_syms = htab->all_local_syms[bfd_indx];
2653
2654 /* Walk over each section attached to the input bfd. */
2655 for (section = input_bfd->sections;
2656 section != NULL;
2657 section = section->next)
2658 {
2659 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
2660
2661 /* If there aren't any relocs, then there's nothing more
2662 to do. */
2663 if ((section->flags & SEC_RELOC) == 0
2664 || section->reloc_count == 0)
2665 continue;
2666
2667 /* If this section is a link-once section that will be
2668 discarded, then don't create any stubs. */
2669 if (section->output_section == NULL
2670 || section->output_section->owner != output_bfd)
2671 continue;
2672
2673 /* Get the relocs. */
2674 internal_relocs
2675 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
2676 info->keep_memory);
2677 if (internal_relocs == NULL)
2678 goto error_ret_free_local;
2679
2680 /* Now examine each relocation. */
2681 irela = internal_relocs;
2682 irelaend = irela + section->reloc_count;
2683 for (; irela < irelaend; irela++)
2684 {
2685 unsigned int r_type, r_indx;
2686 enum elf32_nios2_stub_type stub_type;
2687 struct elf32_nios2_stub_hash_entry *hsh;
2688 asection *sym_sec;
2689 bfd_vma sym_value;
2690 bfd_vma destination;
2691 struct elf32_nios2_link_hash_entry *hh;
2692 char *stub_name;
2693 const asection *id_sec;
2694
2695 r_type = ELF32_R_TYPE (irela->r_info);
2696 r_indx = ELF32_R_SYM (irela->r_info);
2697
2698 if (r_type >= (unsigned int) R_NIOS2_ILLEGAL)
2699 {
2700 bfd_set_error (bfd_error_bad_value);
2701 error_ret_free_internal:
2702 if (elf_section_data (section)->relocs == NULL)
2703 free (internal_relocs);
2704 goto error_ret_free_local;
2705 }
2706
2707 /* Only look for stubs on CALL and JMPI instructions. */
2708 if (r_type != (unsigned int) R_NIOS2_CALL26)
2709 continue;
2710
2711 /* Now determine the call target, its name, value,
2712 section. */
2713 sym_sec = NULL;
2714 sym_value = 0;
2715 destination = 0;
2716 hh = NULL;
2717 if (r_indx < symtab_hdr->sh_info)
2718 {
2719 /* It's a local symbol. */
2720 Elf_Internal_Sym *sym;
2721 Elf_Internal_Shdr *hdr;
2722 unsigned int shndx;
2723
2724 sym = local_syms + r_indx;
2725 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2726 sym_value = sym->st_value;
2727 shndx = sym->st_shndx;
2728 if (shndx < elf_numsections (input_bfd))
2729 {
2730 hdr = elf_elfsections (input_bfd)[shndx];
2731 sym_sec = hdr->bfd_section;
2732 destination = (sym_value + irela->r_addend
2733 + sym_sec->output_offset
2734 + sym_sec->output_section->vma);
2735 }
2736 }
2737 else
2738 {
2739 /* It's an external symbol. */
2740 int e_indx;
2741
2742 e_indx = r_indx - symtab_hdr->sh_info;
2743 hh = ((struct elf32_nios2_link_hash_entry *)
2744 elf_sym_hashes (input_bfd)[e_indx]);
2745
2746 while (hh->root.root.type == bfd_link_hash_indirect
2747 || hh->root.root.type == bfd_link_hash_warning)
2748 hh = ((struct elf32_nios2_link_hash_entry *)
2749 hh->root.root.u.i.link);
2750
2751 if (hh->root.root.type == bfd_link_hash_defined
2752 || hh->root.root.type == bfd_link_hash_defweak)
2753 {
2754 sym_sec = hh->root.root.u.def.section;
2755 sym_value = hh->root.root.u.def.value;
2756
2757 if (sym_sec->output_section != NULL)
2758 destination = (sym_value + irela->r_addend
2759 + sym_sec->output_offset
2760 + sym_sec->output_section->vma);
2761 else
2762 continue;
2763 }
2764 else if (hh->root.root.type == bfd_link_hash_undefweak)
2765 {
2766 if (! bfd_link_pic (info))
2767 continue;
2768 }
2769 else if (hh->root.root.type == bfd_link_hash_undefined)
2770 {
2771 if (! (info->unresolved_syms_in_objects == RM_IGNORE
2772 && (ELF_ST_VISIBILITY (hh->root.other)
2773 == STV_DEFAULT)))
2774 continue;
2775 }
2776 else
2777 {
2778 bfd_set_error (bfd_error_bad_value);
2779 goto error_ret_free_internal;
2780 }
2781 }
2782
2783 /* Determine what (if any) linker stub is needed. */
2784 stub_type = nios2_type_of_stub (section, irela, hh, htab,
2785 destination, info);
2786 if (stub_type == nios2_stub_none)
2787 continue;
2788
2789 /* Support for grouping stub sections. */
2790 if (stub_type == nios2_stub_call26_before)
2791 id_sec = htab->stub_group[section->id].first_sec;
2792 else
2793 id_sec = htab->stub_group[section->id].last_sec;
2794
2795 /* Get the name of this stub. */
2796 stub_name = nios2_stub_name (id_sec, sym_sec, hh, irela,
2797 stub_type);
2798 if (!stub_name)
2799 goto error_ret_free_internal;
2800
2801 hsh = nios2_stub_hash_lookup (&htab->bstab,
2802 stub_name,
2803 false, false);
2804 if (hsh != NULL)
2805 {
2806 /* The proper stub has already been created. */
2807 free (stub_name);
2808 continue;
2809 }
2810
2811 hsh = nios2_add_stub (stub_name, section, htab, stub_type);
2812 if (hsh == NULL)
2813 {
2814 free (stub_name);
2815 goto error_ret_free_internal;
2816 }
2817 hsh->target_value = sym_value;
2818 hsh->target_section = sym_sec;
2819 hsh->stub_type = stub_type;
2820 hsh->hh = hh;
2821 hsh->addend = irela->r_addend;
2822 stub_changed = true;
2823 }
2824
2825 /* We're done with the internal relocs, free them. */
2826 if (elf_section_data (section)->relocs == NULL)
2827 free (internal_relocs);
2828 }
2829 }
2830
2831 if (!stub_changed)
2832 break;
2833
2834 /* OK, we've added some stubs. Find out the new size of the
2835 stub sections. */
2836 for (stub_sec = htab->stub_bfd->sections;
2837 stub_sec != NULL;
2838 stub_sec = stub_sec->next)
2839 stub_sec->size = 0;
2840
2841 bfd_hash_traverse (&htab->bstab, nios2_size_one_stub, htab);
2842
2843 /* Ask the linker to do its stuff. */
2844 (*htab->layout_sections_again) ();
2845 stub_changed = false;
2846 }
2847
2848 free (htab->all_local_syms);
2849 return true;
2850
2851 error_ret_free_local:
2852 free (htab->all_local_syms);
2853 return false;
2854 }
2855
2856 /* Build all the stubs associated with the current output file. The
2857 stubs are kept in a hash table attached to the main linker hash
2858 table. This function is called via nios2elf_finish in the linker. */
2859 bool
nios2_elf32_build_stubs(struct bfd_link_info * info)2860 nios2_elf32_build_stubs (struct bfd_link_info *info)
2861 {
2862 asection *stub_sec;
2863 struct bfd_hash_table *table;
2864 struct elf32_nios2_link_hash_table *htab;
2865
2866 htab = elf32_nios2_hash_table (info);
2867
2868 for (stub_sec = htab->stub_bfd->sections;
2869 stub_sec != NULL;
2870 stub_sec = stub_sec->next)
2871 /* The stub_bfd may contain non-stub sections if it is also the
2872 dynobj. Any such non-stub sections are created with the
2873 SEC_LINKER_CREATED flag set, while stub sections do not
2874 have that flag. Ignore any non-stub sections here. */
2875 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
2876 {
2877 bfd_size_type size;
2878
2879 /* Allocate memory to hold the linker stubs. */
2880 size = stub_sec->size;
2881 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
2882 if (stub_sec->contents == NULL && size != 0)
2883 return false;
2884 stub_sec->size = 0;
2885 }
2886
2887 /* Build the stubs as directed by the stub hash table. */
2888 table = &htab->bstab;
2889 bfd_hash_traverse (table, nios2_build_one_stub, info);
2890
2891 return true;
2892 }
2893
2894
2895 #define is_nios2_elf(bfd) \
2896 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
2897 && elf_object_id (bfd) == NIOS2_ELF_DATA)
2898
2899 /* Merge backend specific data from an object file to the output
2900 object file when linking. */
2901
2902 static bool
nios2_elf32_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)2903 nios2_elf32_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
2904 {
2905 bfd *obfd = info->output_bfd;
2906 flagword old_flags;
2907 flagword new_flags;
2908
2909 if (!is_nios2_elf (ibfd) || !is_nios2_elf (obfd))
2910 return true;
2911
2912 /* Check if we have the same endianness. */
2913 if (! _bfd_generic_verify_endian_match (ibfd, info))
2914 return false;
2915
2916 new_flags = elf_elfheader (ibfd)->e_flags;
2917 old_flags = elf_elfheader (obfd)->e_flags;
2918 if (!elf_flags_init (obfd))
2919 {
2920 /* First call, no flags set. */
2921 elf_flags_init (obfd) = true;
2922 elf_elfheader (obfd)->e_flags = new_flags;
2923
2924 switch (new_flags)
2925 {
2926 default:
2927 case EF_NIOS2_ARCH_R1:
2928 bfd_default_set_arch_mach (obfd, bfd_arch_nios2, bfd_mach_nios2r1);
2929 break;
2930 case EF_NIOS2_ARCH_R2:
2931 if (bfd_big_endian (ibfd))
2932 {
2933 _bfd_error_handler
2934 (_("error: %pB: big-endian R2 is not supported"), ibfd);
2935 bfd_set_error (bfd_error_bad_value);
2936 return false;
2937 }
2938 bfd_default_set_arch_mach (obfd, bfd_arch_nios2, bfd_mach_nios2r2);
2939 break;
2940 }
2941 }
2942
2943 /* Incompatible flags. */
2944 else if (new_flags != old_flags)
2945 {
2946 /* So far, the only incompatible flags denote incompatible
2947 architectures. */
2948 _bfd_error_handler
2949 /* xgettext:c-format */
2950 (_("error: %pB: conflicting CPU architectures %d/%d"),
2951 ibfd, new_flags, old_flags);
2952 bfd_set_error (bfd_error_bad_value);
2953 return false;
2954 }
2955
2956 /* Merge Tag_compatibility attributes and any common GNU ones. */
2957 _bfd_elf_merge_object_attributes (ibfd, info);
2958
2959 return true;
2960 }
2961
2962 /* Implement bfd_elf32_bfd_reloc_type_lookup:
2963 Given a BFD reloc type, return a howto structure. */
2964
2965 static reloc_howto_type *
nios2_elf32_bfd_reloc_type_lookup(bfd * abfd,bfd_reloc_code_real_type code)2966 nios2_elf32_bfd_reloc_type_lookup (bfd *abfd,
2967 bfd_reloc_code_real_type code)
2968 {
2969 int i;
2970
2971 for (i = 0; i < (int) ARRAY_SIZE (nios2_reloc_map); ++i)
2972 if (nios2_reloc_map[i].bfd_val == code)
2973 return lookup_howto (nios2_reloc_map[i].elf_val, abfd);
2974 return NULL;
2975 }
2976
2977 /* Implement bfd_elf32_bfd_reloc_name_lookup:
2978 Given a reloc name, return a howto structure. */
2979
2980 static reloc_howto_type *
nios2_elf32_bfd_reloc_name_lookup(bfd * abfd,const char * r_name)2981 nios2_elf32_bfd_reloc_name_lookup (bfd *abfd,
2982 const char *r_name)
2983 {
2984 int i;
2985 reloc_howto_type *howto_tbl;
2986 int howto_tbl_size;
2987
2988 if (BFD_IS_R2 (abfd))
2989 {
2990 howto_tbl = elf_nios2_r2_howto_table_rel;
2991 howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r2_howto_table_rel);
2992 }
2993 else
2994 {
2995 howto_tbl = elf_nios2_r1_howto_table_rel;
2996 howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r1_howto_table_rel);
2997 }
2998
2999 for (i = 0; i < howto_tbl_size; i++)
3000 if (howto_tbl[i].name && strcasecmp (howto_tbl[i].name, r_name) == 0)
3001 return howto_tbl + i;
3002
3003 return NULL;
3004 }
3005
3006 /* Implement elf_info_to_howto:
3007 Given a ELF32 relocation, fill in a arelent structure. */
3008
3009 static bool
nios2_elf32_info_to_howto(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)3010 nios2_elf32_info_to_howto (bfd *abfd, arelent *cache_ptr,
3011 Elf_Internal_Rela *dst)
3012 {
3013 unsigned int r_type;
3014
3015 r_type = ELF32_R_TYPE (dst->r_info);
3016 if ((cache_ptr->howto = lookup_howto (r_type, abfd)) == NULL)
3017 {
3018 /* xgettext:c-format */
3019 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
3020 abfd, r_type);
3021 bfd_set_error (bfd_error_bad_value);
3022 return false;
3023 }
3024 return true;
3025 }
3026
3027 /* Return the base VMA address which should be subtracted from real addresses
3028 when resolving @dtpoff relocation.
3029 This is PT_TLS segment p_vaddr. */
3030 static bfd_vma
dtpoff_base(struct bfd_link_info * info)3031 dtpoff_base (struct bfd_link_info *info)
3032 {
3033 /* If tls_sec is NULL, we should have signalled an error already. */
3034 if (elf_hash_table (info)->tls_sec == NULL)
3035 return 0;
3036 return elf_hash_table (info)->tls_sec->vma;
3037 }
3038
3039 /* Return the relocation value for @tpoff relocation
3040 if STT_TLS virtual address is ADDRESS. */
3041 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)3042 tpoff (struct bfd_link_info *info, bfd_vma address)
3043 {
3044 struct elf_link_hash_table *htab = elf_hash_table (info);
3045
3046 /* If tls_sec is NULL, we should have signalled an error already. */
3047 if (htab->tls_sec == NULL)
3048 return 0;
3049 return address - htab->tls_sec->vma;
3050 }
3051
3052 /* Set the GP value for OUTPUT_BFD. Returns FALSE if this is a
3053 dangerous relocation. */
3054 static bool
nios2_elf_assign_gp(bfd * output_bfd,bfd_vma * pgp,struct bfd_link_info * info)3055 nios2_elf_assign_gp (bfd *output_bfd, bfd_vma *pgp, struct bfd_link_info *info)
3056 {
3057
3058 bool gp_found;
3059 struct bfd_hash_entry *h;
3060 struct bfd_link_hash_entry *lh;
3061
3062 /* If we've already figured out what GP will be, just return it. */
3063 *pgp = _bfd_get_gp_value (output_bfd);
3064 if (*pgp)
3065 return true;
3066
3067 h = bfd_hash_lookup (&info->hash->table, "_gp", false, false);
3068 lh = (struct bfd_link_hash_entry *) h;
3069 lookup:
3070 if (lh)
3071 {
3072 switch (lh->type)
3073 {
3074 case bfd_link_hash_undefined:
3075 case bfd_link_hash_undefweak:
3076 case bfd_link_hash_common:
3077 gp_found = false;
3078 break;
3079 case bfd_link_hash_defined:
3080 case bfd_link_hash_defweak:
3081 gp_found = true;
3082 {
3083 asection *sym_sec = lh->u.def.section;
3084 bfd_vma sym_value = lh->u.def.value;
3085
3086 if (sym_sec->output_section)
3087 sym_value = (sym_value + sym_sec->output_offset
3088 + sym_sec->output_section->vma);
3089 *pgp = sym_value;
3090 }
3091 break;
3092 case bfd_link_hash_indirect:
3093 case bfd_link_hash_warning:
3094 lh = lh->u.i.link;
3095 /* @@FIXME ignoring warning for now */
3096 goto lookup;
3097 case bfd_link_hash_new:
3098 default:
3099 abort ();
3100 }
3101 }
3102 else
3103 gp_found = false;
3104
3105 if (!gp_found)
3106 {
3107 /* Only get the error once. */
3108 *pgp = 4;
3109 _bfd_set_gp_value (output_bfd, *pgp);
3110 return false;
3111 }
3112
3113 _bfd_set_gp_value (output_bfd, *pgp);
3114
3115 return true;
3116 }
3117
3118 /* Retrieve the previously cached _gp pointer, returning bfd_reloc_dangerous
3119 if it's not available as we don't have a link_info pointer available here
3120 to look it up in the output symbol table. We don't need to adjust the
3121 symbol value for an external symbol if we are producing relocatable
3122 output. */
3123 static bfd_reloc_status_type
nios2_elf_final_gp(bfd * output_bfd,asymbol * symbol,bool relocatable,char ** error_message,bfd_vma * pgp)3124 nios2_elf_final_gp (bfd *output_bfd, asymbol *symbol, bool relocatable,
3125 char **error_message, bfd_vma *pgp)
3126 {
3127 if (bfd_is_und_section (symbol->section) && !relocatable)
3128 {
3129 *pgp = 0;
3130 return bfd_reloc_undefined;
3131 }
3132
3133 *pgp = _bfd_get_gp_value (output_bfd);
3134 if (*pgp == 0 && (!relocatable || (symbol->flags & BSF_SECTION_SYM) != 0))
3135 {
3136 if (relocatable)
3137 {
3138 /* Make up a value. */
3139 *pgp = symbol->section->output_section->vma + 0x4000;
3140 _bfd_set_gp_value (output_bfd, *pgp);
3141 }
3142 else
3143 {
3144 *error_message
3145 = (char *) _("global pointer relative relocation when _gp not defined");
3146 return bfd_reloc_dangerous;
3147 }
3148 }
3149
3150 return bfd_reloc_ok;
3151 }
3152
3153 /* Do the relocations that require special handling. */
3154 static bfd_reloc_status_type
nios2_elf32_do_hi16_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3155 nios2_elf32_do_hi16_relocate (bfd *abfd, reloc_howto_type *howto,
3156 asection *input_section,
3157 bfd_byte *data, bfd_vma offset,
3158 bfd_vma symbol_value, bfd_vma addend)
3159 {
3160 symbol_value = symbol_value + addend;
3161 addend = 0;
3162 symbol_value = (symbol_value >> 16) & 0xffff;
3163 return _bfd_final_link_relocate (howto, abfd, input_section,
3164 data, offset, symbol_value, addend);
3165 }
3166
3167 static bfd_reloc_status_type
nios2_elf32_do_lo16_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3168 nios2_elf32_do_lo16_relocate (bfd *abfd, reloc_howto_type *howto,
3169 asection *input_section,
3170 bfd_byte *data, bfd_vma offset,
3171 bfd_vma symbol_value, bfd_vma addend)
3172 {
3173 symbol_value = symbol_value + addend;
3174 addend = 0;
3175 symbol_value = symbol_value & 0xffff;
3176 return _bfd_final_link_relocate (howto, abfd, input_section,
3177 data, offset, symbol_value, addend);
3178 }
3179
3180 static bfd_reloc_status_type
nios2_elf32_do_hiadj16_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3181 nios2_elf32_do_hiadj16_relocate (bfd *abfd, reloc_howto_type *howto,
3182 asection *input_section,
3183 bfd_byte *data, bfd_vma offset,
3184 bfd_vma symbol_value, bfd_vma addend)
3185 {
3186 symbol_value = symbol_value + addend;
3187 addend = 0;
3188 symbol_value = hiadj(symbol_value);
3189 return _bfd_final_link_relocate (howto, abfd, input_section, data, offset,
3190 symbol_value, addend);
3191 }
3192
3193 static bfd_reloc_status_type
nios2_elf32_do_pcrel_lo16_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3194 nios2_elf32_do_pcrel_lo16_relocate (bfd *abfd, reloc_howto_type *howto,
3195 asection *input_section,
3196 bfd_byte *data, bfd_vma offset,
3197 bfd_vma symbol_value, bfd_vma addend)
3198 {
3199 symbol_value = symbol_value + addend;
3200 addend = 0;
3201 symbol_value = symbol_value & 0xffff;
3202 return _bfd_final_link_relocate (howto, abfd, input_section,
3203 data, offset, symbol_value, addend);
3204 }
3205
3206 static bfd_reloc_status_type
nios2_elf32_do_pcrel_hiadj16_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3207 nios2_elf32_do_pcrel_hiadj16_relocate (bfd *abfd, reloc_howto_type *howto,
3208 asection *input_section,
3209 bfd_byte *data, bfd_vma offset,
3210 bfd_vma symbol_value, bfd_vma addend)
3211 {
3212 symbol_value = symbol_value + addend;
3213 symbol_value -= (input_section->output_section->vma
3214 + input_section->output_offset);
3215 symbol_value -= offset;
3216 addend = 0;
3217 symbol_value = hiadj(symbol_value);
3218 return _bfd_final_link_relocate (howto, abfd, input_section, data, offset,
3219 symbol_value, addend);
3220 }
3221
3222 static bfd_reloc_status_type
nios2_elf32_do_pcrel16_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3223 nios2_elf32_do_pcrel16_relocate (bfd *abfd, reloc_howto_type *howto,
3224 asection *input_section,
3225 bfd_byte *data, bfd_vma offset,
3226 bfd_vma symbol_value, bfd_vma addend)
3227 {
3228 /* NIOS2 pc relative relocations are relative to the next 32-bit instruction
3229 so we need to subtract 4 before doing a final_link_relocate. */
3230 symbol_value = symbol_value + addend - 4;
3231 addend = 0;
3232 return _bfd_final_link_relocate (howto, abfd, input_section,
3233 data, offset, symbol_value, addend);
3234 }
3235
3236 static bfd_reloc_status_type
nios2_elf32_do_call26_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3237 nios2_elf32_do_call26_relocate (bfd *abfd, reloc_howto_type *howto,
3238 asection *input_section,
3239 bfd_byte *data, bfd_vma offset,
3240 bfd_vma symbol_value, bfd_vma addend)
3241 {
3242 /* Check that the relocation is in the same page as the current address. */
3243 if (CALL26_SEGMENT (symbol_value + addend)
3244 != CALL26_SEGMENT (input_section->output_section->vma
3245 + input_section->output_offset
3246 + offset))
3247 return bfd_reloc_overflow;
3248
3249 /* Check that the target address is correctly aligned on a 4-byte
3250 boundary. */
3251 if ((symbol_value + addend) & 0x3)
3252 return bfd_reloc_overflow;
3253
3254 return _bfd_final_link_relocate (howto, abfd, input_section,
3255 data, offset, symbol_value, addend);
3256 }
3257
3258 static bfd_reloc_status_type
nios2_elf32_do_gprel_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3259 nios2_elf32_do_gprel_relocate (bfd *abfd, reloc_howto_type *howto,
3260 asection *input_section,
3261 bfd_byte *data, bfd_vma offset,
3262 bfd_vma symbol_value, bfd_vma addend)
3263 {
3264 /* Because we need the output_bfd, the special handling is done
3265 in nios2_elf32_relocate_section or in nios2_elf32_gprel_relocate. */
3266 return _bfd_final_link_relocate (howto, abfd, input_section,
3267 data, offset, symbol_value, addend);
3268 }
3269
3270 static bfd_reloc_status_type
nios2_elf32_do_ujmp_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3271 nios2_elf32_do_ujmp_relocate (bfd *abfd, reloc_howto_type *howto,
3272 asection *input_section,
3273 bfd_byte *data, bfd_vma offset,
3274 bfd_vma symbol_value, bfd_vma addend)
3275 {
3276 bfd_vma symbol_lo16, symbol_hi16;
3277 bfd_reloc_status_type r;
3278 symbol_value = symbol_value + addend;
3279 addend = 0;
3280 symbol_hi16 = (symbol_value >> 16) & 0xffff;
3281 symbol_lo16 = symbol_value & 0xffff;
3282
3283 r = _bfd_final_link_relocate (howto, abfd, input_section,
3284 data, offset, symbol_hi16, addend);
3285
3286 if (r == bfd_reloc_ok)
3287 return _bfd_final_link_relocate (howto, abfd, input_section,
3288 data, offset + 4, symbol_lo16, addend);
3289
3290 return r;
3291 }
3292
3293 static bfd_reloc_status_type
nios2_elf32_do_cjmp_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3294 nios2_elf32_do_cjmp_relocate (bfd *abfd, reloc_howto_type *howto,
3295 asection *input_section,
3296 bfd_byte *data, bfd_vma offset,
3297 bfd_vma symbol_value, bfd_vma addend)
3298 {
3299 bfd_vma symbol_lo16, symbol_hi16;
3300 bfd_reloc_status_type r;
3301 symbol_value = symbol_value + addend;
3302 addend = 0;
3303 symbol_hi16 = (symbol_value >> 16) & 0xffff;
3304 symbol_lo16 = symbol_value & 0xffff;
3305
3306 r = _bfd_final_link_relocate (howto, abfd, input_section,
3307 data, offset, symbol_hi16, addend);
3308
3309 if (r == bfd_reloc_ok)
3310 return _bfd_final_link_relocate (howto, abfd, input_section,
3311 data, offset + 4, symbol_lo16, addend);
3312
3313 return r;
3314 }
3315
3316 static bfd_reloc_status_type
nios2_elf32_do_callr_relocate(bfd * abfd,reloc_howto_type * howto,asection * input_section,bfd_byte * data,bfd_vma offset,bfd_vma symbol_value,bfd_vma addend)3317 nios2_elf32_do_callr_relocate (bfd *abfd, reloc_howto_type *howto,
3318 asection *input_section,
3319 bfd_byte *data, bfd_vma offset,
3320 bfd_vma symbol_value, bfd_vma addend)
3321 {
3322 bfd_vma symbol_lo16, symbol_hi16;
3323 bfd_reloc_status_type r;
3324 symbol_value = symbol_value + addend;
3325 addend = 0;
3326 symbol_hi16 = (symbol_value >> 16) & 0xffff;
3327 symbol_lo16 = symbol_value & 0xffff;
3328
3329 r = _bfd_final_link_relocate (howto, abfd, input_section,
3330 data, offset, symbol_hi16, addend);
3331
3332 if (r == bfd_reloc_ok)
3333 return _bfd_final_link_relocate (howto, abfd, input_section,
3334 data, offset + 4, symbol_lo16, addend);
3335
3336 return r;
3337 }
3338
3339 /* HOWTO handlers for relocations that require special handling. */
3340
3341 /* This is for relocations used only when relaxing to ensure
3342 changes in size of section don't screw up .align. */
3343 static bfd_reloc_status_type
nios2_elf32_ignore_reloc(bfd * abfd ATTRIBUTE_UNUSED,arelent * reloc_entry,asymbol * symbol ATTRIBUTE_UNUSED,void * data ATTRIBUTE_UNUSED,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3344 nios2_elf32_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc_entry,
3345 asymbol *symbol ATTRIBUTE_UNUSED,
3346 void *data ATTRIBUTE_UNUSED, asection *input_section,
3347 bfd *output_bfd,
3348 char **error_message ATTRIBUTE_UNUSED)
3349 {
3350 if (output_bfd != NULL)
3351 reloc_entry->address += input_section->output_offset;
3352 return bfd_reloc_ok;
3353 }
3354
3355 static bfd_reloc_status_type
nios2_elf32_hi16_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3356 nios2_elf32_hi16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3357 void *data, asection *input_section,
3358 bfd *output_bfd,
3359 char **error_message ATTRIBUTE_UNUSED)
3360 {
3361 /* This part is from bfd_elf_generic_reloc. */
3362 if (output_bfd != NULL
3363 && (symbol->flags & BSF_SECTION_SYM) == 0
3364 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3365 {
3366 reloc_entry->address += input_section->output_offset;
3367 return bfd_reloc_ok;
3368 }
3369
3370 if (output_bfd != NULL)
3371 /* FIXME: See bfd_perform_relocation. Is this right? */
3372 return bfd_reloc_continue;
3373
3374 return nios2_elf32_do_hi16_relocate (abfd, reloc_entry->howto,
3375 input_section,
3376 data, reloc_entry->address,
3377 (symbol->value
3378 + symbol->section->output_section->vma
3379 + symbol->section->output_offset),
3380 reloc_entry->addend);
3381 }
3382
3383 static bfd_reloc_status_type
nios2_elf32_lo16_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3384 nios2_elf32_lo16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3385 void *data, asection *input_section,
3386 bfd *output_bfd,
3387 char **error_message ATTRIBUTE_UNUSED)
3388 {
3389 /* This part is from bfd_elf_generic_reloc. */
3390 if (output_bfd != NULL
3391 && (symbol->flags & BSF_SECTION_SYM) == 0
3392 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3393 {
3394 reloc_entry->address += input_section->output_offset;
3395 return bfd_reloc_ok;
3396 }
3397
3398 if (output_bfd != NULL)
3399 /* FIXME: See bfd_perform_relocation. Is this right? */
3400 return bfd_reloc_continue;
3401
3402 return nios2_elf32_do_lo16_relocate (abfd, reloc_entry->howto,
3403 input_section,
3404 data, reloc_entry->address,
3405 (symbol->value
3406 + symbol->section->output_section->vma
3407 + symbol->section->output_offset),
3408 reloc_entry->addend);
3409 }
3410
3411 static bfd_reloc_status_type
nios2_elf32_hiadj16_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3412 nios2_elf32_hiadj16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3413 void *data, asection *input_section,
3414 bfd *output_bfd,
3415 char **error_message ATTRIBUTE_UNUSED)
3416 {
3417 /* This part is from bfd_elf_generic_reloc. */
3418 if (output_bfd != NULL
3419 && (symbol->flags & BSF_SECTION_SYM) == 0
3420 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3421 {
3422 reloc_entry->address += input_section->output_offset;
3423 return bfd_reloc_ok;
3424 }
3425
3426 if (output_bfd != NULL)
3427 /* FIXME: See bfd_perform_relocation. Is this right? */
3428 return bfd_reloc_continue;
3429
3430 return nios2_elf32_do_hiadj16_relocate (abfd, reloc_entry->howto,
3431 input_section,
3432 data, reloc_entry->address,
3433 (symbol->value
3434 + symbol->section->output_section->vma
3435 + symbol->section->output_offset),
3436 reloc_entry->addend);
3437 }
3438
3439 static bfd_reloc_status_type
nios2_elf32_pcrel_lo16_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3440 nios2_elf32_pcrel_lo16_relocate (bfd *abfd, arelent *reloc_entry,
3441 asymbol *symbol, void *data,
3442 asection *input_section, bfd *output_bfd,
3443 char **error_message ATTRIBUTE_UNUSED)
3444 {
3445 /* This part is from bfd_elf_generic_reloc. */
3446 if (output_bfd != NULL
3447 && (symbol->flags & BSF_SECTION_SYM) == 0
3448 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3449 {
3450 reloc_entry->address += input_section->output_offset;
3451 return bfd_reloc_ok;
3452 }
3453
3454 if (output_bfd != NULL)
3455 /* FIXME: See bfd_perform_relocation. Is this right? */
3456 return bfd_reloc_continue;
3457
3458 return nios2_elf32_do_pcrel_lo16_relocate (
3459 abfd, reloc_entry->howto, input_section, data, reloc_entry->address,
3460 (symbol->value + symbol->section->output_section->vma
3461 + symbol->section->output_offset),
3462 reloc_entry->addend);
3463 }
3464
3465 static bfd_reloc_status_type
nios2_elf32_pcrel_hiadj16_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3466 nios2_elf32_pcrel_hiadj16_relocate (bfd *abfd, arelent *reloc_entry,
3467 asymbol *symbol, void *data,
3468 asection *input_section, bfd *output_bfd,
3469 char **error_message ATTRIBUTE_UNUSED)
3470 {
3471 /* This part is from bfd_elf_generic_reloc. */
3472 if (output_bfd != NULL
3473 && (symbol->flags & BSF_SECTION_SYM) == 0
3474 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3475 {
3476 reloc_entry->address += input_section->output_offset;
3477 return bfd_reloc_ok;
3478 }
3479
3480 if (output_bfd != NULL)
3481 /* FIXME: See bfd_perform_relocation. Is this right? */
3482 return bfd_reloc_continue;
3483
3484 return nios2_elf32_do_pcrel_hiadj16_relocate (
3485 abfd, reloc_entry->howto, input_section, data, reloc_entry->address,
3486 (symbol->value + symbol->section->output_section->vma
3487 + symbol->section->output_offset),
3488 reloc_entry->addend);
3489 }
3490
3491 static bfd_reloc_status_type
nios2_elf32_pcrel16_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3492 nios2_elf32_pcrel16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3493 void *data, asection *input_section,
3494 bfd *output_bfd,
3495 char **error_message ATTRIBUTE_UNUSED)
3496 {
3497 /* This part is from bfd_elf_generic_reloc. */
3498 if (output_bfd != NULL
3499 && (symbol->flags & BSF_SECTION_SYM) == 0
3500 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3501 {
3502 reloc_entry->address += input_section->output_offset;
3503 return bfd_reloc_ok;
3504 }
3505
3506 if (output_bfd != NULL)
3507 /* FIXME: See bfd_perform_relocation. Is this right? */
3508 return bfd_reloc_continue;
3509
3510 return nios2_elf32_do_pcrel16_relocate (abfd, reloc_entry->howto,
3511 input_section,
3512 data, reloc_entry->address,
3513 (symbol->value
3514 + symbol->section->output_section->vma
3515 + symbol->section->output_offset),
3516 reloc_entry->addend);
3517 }
3518
3519 static bfd_reloc_status_type
nios2_elf32_call26_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)3520 nios2_elf32_call26_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3521 void *data, asection *input_section,
3522 bfd *output_bfd,
3523 char **error_message ATTRIBUTE_UNUSED)
3524 {
3525 /* This part is from bfd_elf_generic_reloc. */
3526 if (output_bfd != NULL
3527 && (symbol->flags & BSF_SECTION_SYM) == 0
3528 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3529 {
3530 reloc_entry->address += input_section->output_offset;
3531 return bfd_reloc_ok;
3532 }
3533
3534 if (output_bfd != NULL)
3535 /* FIXME: See bfd_perform_relocation. Is this right? */
3536 return bfd_reloc_continue;
3537
3538 return nios2_elf32_do_call26_relocate (abfd, reloc_entry->howto,
3539 input_section,
3540 data, reloc_entry->address,
3541 (symbol->value
3542 + symbol->section->output_section->vma
3543 + symbol->section->output_offset),
3544 reloc_entry->addend);
3545 }
3546
3547 static bfd_reloc_status_type
nios2_elf32_gprel_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** msg)3548 nios2_elf32_gprel_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3549 void *data, asection *input_section,
3550 bfd *output_bfd, char **msg)
3551 {
3552 bfd_vma relocation;
3553 bfd_vma gp;
3554 bfd_reloc_status_type r;
3555
3556
3557 /* This part is from bfd_elf_generic_reloc. */
3558 if (output_bfd != NULL
3559 && (symbol->flags & BSF_SECTION_SYM) == 0
3560 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3561 {
3562 reloc_entry->address += input_section->output_offset;
3563 return bfd_reloc_ok;
3564 }
3565
3566 if (output_bfd != NULL)
3567 /* FIXME: See bfd_perform_relocation. Is this right? */
3568 return bfd_reloc_continue;
3569
3570 relocation = (symbol->value
3571 + symbol->section->output_section->vma
3572 + symbol->section->output_offset);
3573
3574 /* This assumes we've already cached the _gp symbol. */
3575 r = nios2_elf_final_gp (abfd, symbol, false, msg, &gp);
3576 if (r == bfd_reloc_ok)
3577 {
3578 relocation = relocation + reloc_entry->addend - gp;
3579 reloc_entry->addend = 0;
3580 if ((signed) relocation < -32768 || (signed) relocation > 32767)
3581 {
3582 *msg = _("global pointer relative address out of range");
3583 r = bfd_reloc_outofrange;
3584 }
3585 else
3586 r = nios2_elf32_do_gprel_relocate (abfd, reloc_entry->howto,
3587 input_section,
3588 data, reloc_entry->address,
3589 relocation, reloc_entry->addend);
3590 }
3591
3592 return r;
3593 }
3594
3595 static bfd_reloc_status_type
nios2_elf32_ujmp_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** msg ATTRIBUTE_UNUSED)3596 nios2_elf32_ujmp_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3597 void *data, asection *input_section,
3598 bfd *output_bfd, char **msg ATTRIBUTE_UNUSED)
3599 {
3600 /* This part is from bfd_elf_generic_reloc. */
3601 if (output_bfd != NULL
3602 && (symbol->flags & BSF_SECTION_SYM) == 0
3603 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3604 {
3605 reloc_entry->address += input_section->output_offset;
3606 return bfd_reloc_ok;
3607 }
3608
3609 if (output_bfd != NULL)
3610 /* FIXME: See bfd_perform_relocation. Is this right? */
3611 return bfd_reloc_continue;
3612
3613 return nios2_elf32_do_ujmp_relocate (abfd, reloc_entry->howto,
3614 input_section,
3615 data, reloc_entry->address,
3616 (symbol->value
3617 + symbol->section->output_section->vma
3618 + symbol->section->output_offset),
3619 reloc_entry->addend);
3620 }
3621
3622 static bfd_reloc_status_type
nios2_elf32_cjmp_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** msg ATTRIBUTE_UNUSED)3623 nios2_elf32_cjmp_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3624 void *data, asection *input_section,
3625 bfd *output_bfd, char **msg ATTRIBUTE_UNUSED)
3626 {
3627 /* This part is from bfd_elf_generic_reloc. */
3628 if (output_bfd != NULL
3629 && (symbol->flags & BSF_SECTION_SYM) == 0
3630 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3631 {
3632 reloc_entry->address += input_section->output_offset;
3633 return bfd_reloc_ok;
3634 }
3635
3636 if (output_bfd != NULL)
3637 /* FIXME: See bfd_perform_relocation. Is this right? */
3638 return bfd_reloc_continue;
3639
3640 return nios2_elf32_do_cjmp_relocate (abfd, reloc_entry->howto,
3641 input_section,
3642 data, reloc_entry->address,
3643 (symbol->value
3644 + symbol->section->output_section->vma
3645 + symbol->section->output_offset),
3646 reloc_entry->addend);
3647 }
3648
3649 static bfd_reloc_status_type
nios2_elf32_callr_relocate(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** msg ATTRIBUTE_UNUSED)3650 nios2_elf32_callr_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
3651 void *data, asection *input_section,
3652 bfd *output_bfd, char **msg ATTRIBUTE_UNUSED)
3653 {
3654 /* This part is from bfd_elf_generic_reloc. */
3655 if (output_bfd != NULL
3656 && (symbol->flags & BSF_SECTION_SYM) == 0
3657 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
3658 {
3659 reloc_entry->address += input_section->output_offset;
3660 return bfd_reloc_ok;
3661 }
3662
3663 if (output_bfd != NULL)
3664 /* FIXME: See bfd_perform_relocation. Is this right? */
3665 return bfd_reloc_continue;
3666
3667 return nios2_elf32_do_callr_relocate (abfd, reloc_entry->howto,
3668 input_section,
3669 data, reloc_entry->address,
3670 (symbol->value
3671 + symbol->section->output_section->vma
3672 + symbol->section->output_offset),
3673 reloc_entry->addend);
3674 }
3675
3676
3677 /* Implement elf_backend_relocate_section. */
3678 static int
nios2_elf32_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)3679 nios2_elf32_relocate_section (bfd *output_bfd,
3680 struct bfd_link_info *info,
3681 bfd *input_bfd,
3682 asection *input_section,
3683 bfd_byte *contents,
3684 Elf_Internal_Rela *relocs,
3685 Elf_Internal_Sym *local_syms,
3686 asection **local_sections)
3687 {
3688 Elf_Internal_Shdr *symtab_hdr;
3689 struct elf_link_hash_entry **sym_hashes;
3690 Elf_Internal_Rela *rel;
3691 Elf_Internal_Rela *relend;
3692 struct elf32_nios2_link_hash_table *htab;
3693 asection *sgot;
3694 asection *splt;
3695 asection *sreloc = NULL;
3696 bfd_vma *local_got_offsets;
3697 bfd_vma got_base;
3698
3699 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3700 sym_hashes = elf_sym_hashes (input_bfd);
3701 relend = relocs + input_section->reloc_count;
3702
3703 htab = elf32_nios2_hash_table (info);
3704 sgot = htab->root.sgot;
3705 splt = htab->root.splt;
3706 local_got_offsets = elf_local_got_offsets (input_bfd);
3707
3708 if (htab->h_gp_got == NULL)
3709 got_base = 0;
3710 else
3711 got_base = htab->h_gp_got->root.u.def.value;
3712
3713 for (rel = relocs; rel < relend; rel++)
3714 {
3715 reloc_howto_type *howto;
3716 unsigned long r_symndx;
3717 Elf_Internal_Sym *sym;
3718 asection *sec;
3719 struct elf_link_hash_entry *h;
3720 struct elf32_nios2_link_hash_entry *eh;
3721 bfd_vma relocation;
3722 bfd_vma gp;
3723 bfd_reloc_status_type r = bfd_reloc_ok;
3724 const char *name = NULL;
3725 int r_type;
3726 const char *format;
3727 char *msgbuf = NULL;
3728 char *msg = NULL;
3729 bool unresolved_reloc;
3730 bfd_vma off;
3731 int use_plt;
3732
3733 r_type = ELF32_R_TYPE (rel->r_info);
3734 r_symndx = ELF32_R_SYM (rel->r_info);
3735
3736 howto = lookup_howto ((unsigned) ELF32_R_TYPE (rel->r_info), output_bfd);
3737 h = NULL;
3738 sym = NULL;
3739 sec = NULL;
3740
3741 if (r_symndx < symtab_hdr->sh_info)
3742 {
3743 sym = local_syms + r_symndx;
3744 sec = local_sections[r_symndx];
3745 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3746 }
3747 else
3748 {
3749 bool warned, ignored;
3750
3751 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3752 r_symndx, symtab_hdr, sym_hashes,
3753 h, sec, relocation,
3754 unresolved_reloc, warned, ignored);
3755 }
3756
3757 if (sec && discarded_section (sec))
3758 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3759 rel, 1, relend, howto, 0, contents);
3760
3761 /* Nothing more to do unless this is a final link. */
3762 if (bfd_link_relocatable (info))
3763 continue;
3764
3765 if (howto)
3766 {
3767 bool resolved_to_zero;
3768
3769 resolved_to_zero = (h != NULL
3770 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
3771 switch (howto->type)
3772 {
3773 case R_NIOS2_HI16:
3774 r = nios2_elf32_do_hi16_relocate (input_bfd, howto,
3775 input_section,
3776 contents, rel->r_offset,
3777 relocation, rel->r_addend);
3778 break;
3779 case R_NIOS2_LO16:
3780 r = nios2_elf32_do_lo16_relocate (input_bfd, howto,
3781 input_section,
3782 contents, rel->r_offset,
3783 relocation, rel->r_addend);
3784 break;
3785 case R_NIOS2_PCREL_LO:
3786 r = nios2_elf32_do_pcrel_lo16_relocate (input_bfd, howto,
3787 input_section,
3788 contents,
3789 rel->r_offset,
3790 relocation,
3791 rel->r_addend);
3792 break;
3793 case R_NIOS2_HIADJ16:
3794 r = nios2_elf32_do_hiadj16_relocate (input_bfd, howto,
3795 input_section, contents,
3796 rel->r_offset, relocation,
3797 rel->r_addend);
3798 break;
3799 case R_NIOS2_PCREL_HA:
3800 r = nios2_elf32_do_pcrel_hiadj16_relocate (input_bfd, howto,
3801 input_section,
3802 contents,
3803 rel->r_offset,
3804 relocation,
3805 rel->r_addend);
3806 break;
3807 case R_NIOS2_PCREL16:
3808 r = nios2_elf32_do_pcrel16_relocate (input_bfd, howto,
3809 input_section, contents,
3810 rel->r_offset, relocation,
3811 rel->r_addend);
3812 break;
3813 case R_NIOS2_GPREL:
3814 /* Turns an absolute address into a gp-relative address. */
3815 if (!nios2_elf_assign_gp (output_bfd, &gp, info))
3816 {
3817 bfd_vma reloc_address;
3818
3819 if (sec && sec->output_section)
3820 reloc_address = (sec->output_section->vma
3821 + sec->output_offset
3822 + rel->r_offset);
3823 else
3824 reloc_address = 0;
3825
3826 format = _("global pointer relative relocation at address "
3827 "%#" PRIx64 " when _gp not defined\n");
3828 if (asprintf (&msgbuf, format,
3829 (uint64_t) reloc_address) == -1)
3830 msgbuf = NULL;
3831 msg = msgbuf;
3832 r = bfd_reloc_dangerous;
3833 }
3834 else
3835 {
3836 bfd_vma symbol_address = rel->r_addend + relocation;
3837 relocation = symbol_address - gp;
3838 rel->r_addend = 0;
3839 if (((signed) relocation < -32768
3840 || (signed) relocation > 32767)
3841 && (!h
3842 || h->root.type == bfd_link_hash_defined
3843 || h->root.type == bfd_link_hash_defweak))
3844 {
3845 if (h)
3846 name = h->root.root.string;
3847 else
3848 {
3849 name = (bfd_elf_string_from_elf_section
3850 (input_bfd, symtab_hdr->sh_link,
3851 sym->st_name));
3852 if (name == NULL || *name == '\0')
3853 name = bfd_section_name (sec);
3854 }
3855 /* xgettext:c-format */
3856 format = _("unable to reach %s (at %#" PRIx64 ") from "
3857 "the global pointer (at %#" PRIx64 ") "
3858 "because the offset (%" PRId64 ") is out of "
3859 "the allowed range, -32678 to 32767\n" );
3860 if (asprintf (&msgbuf, format, name,
3861 (uint64_t) symbol_address, (uint64_t) gp,
3862 (int64_t) relocation) == -1)
3863 msgbuf = NULL;
3864 msg = msgbuf;
3865 r = bfd_reloc_outofrange;
3866 }
3867 else
3868 r = _bfd_final_link_relocate (howto, input_bfd,
3869 input_section, contents,
3870 rel->r_offset, relocation,
3871 rel->r_addend);
3872 }
3873 break;
3874 case R_NIOS2_UJMP:
3875 r = nios2_elf32_do_ujmp_relocate (input_bfd, howto,
3876 input_section,
3877 contents, rel->r_offset,
3878 relocation, rel->r_addend);
3879 break;
3880 case R_NIOS2_CJMP:
3881 r = nios2_elf32_do_cjmp_relocate (input_bfd, howto,
3882 input_section,
3883 contents, rel->r_offset,
3884 relocation, rel->r_addend);
3885 break;
3886 case R_NIOS2_CALLR:
3887 r = nios2_elf32_do_callr_relocate (input_bfd, howto,
3888 input_section, contents,
3889 rel->r_offset, relocation,
3890 rel->r_addend);
3891 break;
3892 case R_NIOS2_CALL26:
3893 case R_NIOS2_CALL26_NOAT:
3894 /* If we have a call to an undefined weak symbol, we just want
3895 to stuff a zero in the bits of the call instruction and
3896 bypass the normal call26 relocation handling, because it'll
3897 diagnose an overflow error if address 0 isn't in the same
3898 256MB segment as the call site. Presumably the call
3899 should be guarded by a null check anyway. */
3900 if (h != NULL && h->root.type == bfd_link_hash_undefweak)
3901 {
3902 BFD_ASSERT (relocation == 0 && rel->r_addend == 0);
3903 r = _bfd_final_link_relocate (howto, input_bfd,
3904 input_section, contents,
3905 rel->r_offset, relocation,
3906 rel->r_addend);
3907 break;
3908 }
3909 /* Handle relocations which should use the PLT entry.
3910 NIOS2_BFD_RELOC_32 relocations will use the symbol's value,
3911 which may point to a PLT entry, but we don't need to handle
3912 that here. If we created a PLT entry, all branches in this
3913 object should go to it. */
3914 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1)
3915 {
3916 /* If we've created a .plt section, and assigned a PLT entry
3917 to this function, it should not be known to bind locally.
3918 If it were, we would have cleared the PLT entry. */
3919 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h));
3920
3921 relocation = (splt->output_section->vma
3922 + splt->output_offset
3923 + h->plt.offset);
3924
3925 unresolved_reloc = false;
3926 }
3927 /* Detect R_NIOS2_CALL26 relocations that would overflow the
3928 256MB segment. Replace the target with a reference to a
3929 trampoline instead.
3930 Note that htab->stub_group is null if relaxation has been
3931 disabled by the --no-relax linker command-line option, so
3932 we can use that to skip this processing entirely. */
3933 if (howto->type == R_NIOS2_CALL26 && htab->stub_group)
3934 {
3935 bfd_vma dest = relocation + rel->r_addend;
3936 enum elf32_nios2_stub_type stub_type;
3937
3938 eh = (struct elf32_nios2_link_hash_entry *)h;
3939 stub_type = nios2_type_of_stub (input_section, rel, eh,
3940 htab, dest, NULL);
3941
3942 if (stub_type != nios2_stub_none)
3943 {
3944 struct elf32_nios2_stub_hash_entry *hsh;
3945
3946 hsh = nios2_get_stub_entry (input_section, sec,
3947 eh, rel, htab, stub_type);
3948 if (hsh == NULL)
3949 {
3950 r = bfd_reloc_undefined;
3951 break;
3952 }
3953
3954 dest = (hsh->stub_offset
3955 + hsh->stub_sec->output_offset
3956 + hsh->stub_sec->output_section->vma);
3957 r = nios2_elf32_do_call26_relocate (input_bfd, howto,
3958 input_section,
3959 contents,
3960 rel->r_offset,
3961 dest, 0);
3962 break;
3963 }
3964 }
3965
3966 /* Normal case. */
3967 r = nios2_elf32_do_call26_relocate (input_bfd, howto,
3968 input_section, contents,
3969 rel->r_offset, relocation,
3970 rel->r_addend);
3971 break;
3972 case R_NIOS2_ALIGN:
3973 r = bfd_reloc_ok;
3974 /* For symmetry this would be
3975 r = nios2_elf32_do_ignore_reloc (input_bfd, howto,
3976 input_section, contents,
3977 rel->r_offset, relocation,
3978 rel->r_addend);
3979 but do_ignore_reloc would do no more than return
3980 bfd_reloc_ok. */
3981 break;
3982
3983 case R_NIOS2_GOT16:
3984 case R_NIOS2_CALL16:
3985 case R_NIOS2_GOT_LO:
3986 case R_NIOS2_GOT_HA:
3987 case R_NIOS2_CALL_LO:
3988 case R_NIOS2_CALL_HA:
3989 /* Relocation is to the entry for this symbol in the
3990 global offset table. */
3991 if (sgot == NULL)
3992 {
3993 r = bfd_reloc_notsupported;
3994 break;
3995 }
3996
3997 use_plt = 0;
3998
3999 if (h != NULL)
4000 {
4001 bool dyn;
4002
4003 eh = (struct elf32_nios2_link_hash_entry *)h;
4004 use_plt = (eh->got_types_used == CALL_USED
4005 && h->plt.offset != (bfd_vma) -1);
4006
4007 off = h->got.offset;
4008 BFD_ASSERT (off != (bfd_vma) -1);
4009 dyn = htab->root.dynamic_sections_created;
4010 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4011 bfd_link_pic (info),
4012 h)
4013 || (bfd_link_pic (info)
4014 && SYMBOL_REFERENCES_LOCAL (info, h))
4015 || ((ELF_ST_VISIBILITY (h->other)
4016 || resolved_to_zero)
4017 && h->root.type == bfd_link_hash_undefweak))
4018 {
4019 /* This is actually a static link, or it is a -Bsymbolic
4020 link and the symbol is defined locally. We must
4021 initialize this entry in the global offset table.
4022 Since the offset must always be a multiple of 4, we
4023 use the least significant bit to record whether we
4024 have initialized it already.
4025
4026 When doing a dynamic link, we create a .rela.got
4027 relocation entry to initialize the value. This is
4028 done in the finish_dynamic_symbol routine. */
4029 if ((off & 1) != 0)
4030 off &= ~1;
4031 else
4032 {
4033 bfd_put_32 (output_bfd, relocation,
4034 sgot->contents + off);
4035 h->got.offset |= 1;
4036 }
4037 }
4038 else
4039 unresolved_reloc = false;
4040 }
4041 else
4042 {
4043 BFD_ASSERT (local_got_offsets != NULL
4044 && local_got_offsets[r_symndx] != (bfd_vma) -1);
4045
4046 off = local_got_offsets[r_symndx];
4047
4048 /* The offset must always be a multiple of 4. We use the
4049 least significant bit to record whether we have already
4050 generated the necessary reloc. */
4051 if ((off & 1) != 0)
4052 off &= ~1;
4053 else
4054 {
4055 bfd_put_32 (output_bfd, relocation,
4056 sgot->contents + off);
4057
4058 if (bfd_link_pic (info))
4059 {
4060 asection *srelgot;
4061 Elf_Internal_Rela outrel;
4062 bfd_byte *loc;
4063
4064 srelgot = htab->root.srelgot;
4065 BFD_ASSERT (srelgot != NULL);
4066
4067 outrel.r_addend = relocation;
4068 outrel.r_offset = (sgot->output_section->vma
4069 + sgot->output_offset
4070 + off);
4071 outrel.r_info = ELF32_R_INFO (0, R_NIOS2_RELATIVE);
4072 loc = srelgot->contents;
4073 loc += (srelgot->reloc_count++ *
4074 sizeof (Elf32_External_Rela));
4075 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
4076 }
4077
4078 local_got_offsets[r_symndx] |= 1;
4079 }
4080 }
4081
4082 if (use_plt && bfd_link_pic (info))
4083 {
4084 off = ((h->plt.offset - 24) / 12 + 3) * 4;
4085 relocation = (htab->root.sgotplt->output_offset + off
4086 - got_base);
4087 }
4088 else
4089 relocation = sgot->output_offset + off - got_base;
4090
4091 /* This relocation does not use the addend. */
4092 rel->r_addend = 0;
4093
4094 switch (howto->type)
4095 {
4096 case R_NIOS2_GOT_LO:
4097 case R_NIOS2_CALL_LO:
4098 r = nios2_elf32_do_lo16_relocate (input_bfd, howto,
4099 input_section, contents,
4100 rel->r_offset, relocation,
4101 rel->r_addend);
4102 break;
4103 case R_NIOS2_GOT_HA:
4104 case R_NIOS2_CALL_HA:
4105 r = nios2_elf32_do_hiadj16_relocate (input_bfd, howto,
4106 input_section, contents,
4107 rel->r_offset,
4108 relocation,
4109 rel->r_addend);
4110 break;
4111 default:
4112 r = _bfd_final_link_relocate (howto, input_bfd,
4113 input_section, contents,
4114 rel->r_offset, relocation,
4115 rel->r_addend);
4116 break;
4117 }
4118 break;
4119
4120 case R_NIOS2_GOTOFF_LO:
4121 case R_NIOS2_GOTOFF_HA:
4122 case R_NIOS2_GOTOFF:
4123 /* Relocation is relative to the global offset table pointer. */
4124
4125 BFD_ASSERT (sgot != NULL);
4126 if (sgot == NULL)
4127 {
4128 r = bfd_reloc_notsupported;
4129 break;
4130 }
4131
4132 /* Note that sgot->output_offset is not involved in this
4133 calculation. We always want the start of .got. */
4134 relocation -= sgot->output_section->vma;
4135
4136 /* Now we adjust the relocation to be relative to the GOT pointer
4137 (the _gp_got symbol), which possibly contains the 0x8000 bias. */
4138 relocation -= got_base;
4139
4140 switch (howto->type)
4141 {
4142 case R_NIOS2_GOTOFF_LO:
4143 r = nios2_elf32_do_lo16_relocate (input_bfd, howto,
4144 input_section, contents,
4145 rel->r_offset, relocation,
4146 rel->r_addend);
4147 break;
4148 case R_NIOS2_GOTOFF_HA:
4149 r = nios2_elf32_do_hiadj16_relocate (input_bfd, howto,
4150 input_section, contents,
4151 rel->r_offset,
4152 relocation,
4153 rel->r_addend);
4154 break;
4155 default:
4156 r = _bfd_final_link_relocate (howto, input_bfd,
4157 input_section, contents,
4158 rel->r_offset, relocation,
4159 rel->r_addend);
4160 break;
4161 }
4162 break;
4163
4164 case R_NIOS2_TLS_LDO16:
4165 relocation -= dtpoff_base (info) + DTP_OFFSET;
4166
4167 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4168 contents, rel->r_offset,
4169 relocation, rel->r_addend);
4170 break;
4171 case R_NIOS2_TLS_LDM16:
4172 if (htab->root.sgot == NULL)
4173 abort ();
4174
4175 off = htab->tls_ldm_got.offset;
4176
4177 if ((off & 1) != 0)
4178 off &= ~1;
4179 else
4180 {
4181 /* If we don't know the module number, create a relocation
4182 for it. */
4183 if (bfd_link_pic (info))
4184 {
4185 Elf_Internal_Rela outrel;
4186 bfd_byte *loc;
4187
4188 if (htab->root.srelgot == NULL)
4189 abort ();
4190
4191 outrel.r_addend = 0;
4192 outrel.r_offset = (htab->root.sgot->output_section->vma
4193 + htab->root.sgot->output_offset
4194 + off);
4195 outrel.r_info = ELF32_R_INFO (0, R_NIOS2_TLS_DTPMOD);
4196
4197 loc = htab->root.srelgot->contents;
4198 loc += (htab->root.srelgot->reloc_count++
4199 * sizeof (Elf32_External_Rela));
4200 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
4201 }
4202 else
4203 bfd_put_32 (output_bfd, 1,
4204 htab->root.sgot->contents + off);
4205
4206 htab->tls_ldm_got.offset |= 1;
4207 }
4208
4209 relocation = htab->root.sgot->output_offset + off - got_base;
4210
4211 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4212 contents, rel->r_offset,
4213 relocation, rel->r_addend);
4214
4215 break;
4216 case R_NIOS2_TLS_GD16:
4217 case R_NIOS2_TLS_IE16:
4218 {
4219 int indx;
4220 char tls_type;
4221
4222 if (htab->root.sgot == NULL)
4223 abort ();
4224
4225 indx = 0;
4226 if (h != NULL)
4227 {
4228 bool dyn;
4229 dyn = htab->root.dynamic_sections_created;
4230 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4231 bfd_link_pic (info),
4232 h)
4233 && (!bfd_link_pic (info)
4234 || !SYMBOL_REFERENCES_LOCAL (info, h)))
4235 {
4236 unresolved_reloc = false;
4237 indx = h->dynindx;
4238 }
4239 off = h->got.offset;
4240 tls_type = (((struct elf32_nios2_link_hash_entry *) h)
4241 ->tls_type);
4242 }
4243 else
4244 {
4245 if (local_got_offsets == NULL)
4246 abort ();
4247 off = local_got_offsets[r_symndx];
4248 tls_type = (elf32_nios2_local_got_tls_type (input_bfd)
4249 [r_symndx]);
4250 }
4251
4252 if (tls_type == GOT_UNKNOWN)
4253 abort ();
4254
4255 if ((off & 1) != 0)
4256 off &= ~1;
4257 else
4258 {
4259 bool need_relocs = false;
4260 Elf_Internal_Rela outrel;
4261 bfd_byte *loc = NULL;
4262 int cur_off = off;
4263
4264 /* The GOT entries have not been initialized yet. Do it
4265 now, and emit any relocations. If both an IE GOT and a
4266 GD GOT are necessary, we emit the GD first. */
4267
4268 if ((bfd_link_pic (info) || indx != 0)
4269 && (h == NULL
4270 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4271 && !resolved_to_zero)
4272 || h->root.type != bfd_link_hash_undefweak))
4273 {
4274 need_relocs = true;
4275 if (htab->root.srelgot == NULL)
4276 abort ();
4277 loc = htab->root.srelgot->contents;
4278 loc += (htab->root.srelgot->reloc_count *
4279 sizeof (Elf32_External_Rela));
4280 }
4281
4282 if (tls_type & GOT_TLS_GD)
4283 {
4284 if (need_relocs)
4285 {
4286 outrel.r_addend = 0;
4287 outrel.r_offset = (htab->root.sgot->output_section->vma
4288 + htab->root.sgot->output_offset
4289 + cur_off);
4290 outrel.r_info = ELF32_R_INFO (indx,
4291 R_NIOS2_TLS_DTPMOD);
4292
4293 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
4294 loc);
4295 htab->root.srelgot->reloc_count++;
4296 loc += sizeof (Elf32_External_Rela);
4297
4298 if (indx == 0)
4299 bfd_put_32 (output_bfd,
4300 (relocation - dtpoff_base (info) -
4301 DTP_OFFSET),
4302 htab->root.sgot->contents + cur_off + 4);
4303 else
4304 {
4305 outrel.r_addend = 0;
4306 outrel.r_info = ELF32_R_INFO (indx,
4307 R_NIOS2_TLS_DTPREL);
4308 outrel.r_offset += 4;
4309
4310 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
4311 loc);
4312 htab->root.srelgot->reloc_count++;
4313 loc += sizeof (Elf32_External_Rela);
4314 }
4315 }
4316 else
4317 {
4318 /* If we are not emitting relocations for a
4319 general dynamic reference, then we must be in a
4320 static link or an executable link with the
4321 symbol binding locally. Mark it as belonging
4322 to module 1, the executable. */
4323 bfd_put_32 (output_bfd, 1,
4324 htab->root.sgot->contents + cur_off);
4325 bfd_put_32 (output_bfd, (relocation -
4326 dtpoff_base (info) -
4327 DTP_OFFSET),
4328 htab->root.sgot->contents + cur_off + 4);
4329 }
4330
4331 cur_off += 8;
4332 }
4333
4334 if (tls_type & GOT_TLS_IE)
4335 {
4336 if (need_relocs)
4337 {
4338 if (indx == 0)
4339 outrel.r_addend = (relocation -
4340 dtpoff_base (info));
4341 else
4342 outrel.r_addend = 0;
4343 outrel.r_offset = (htab->root.sgot->output_section->vma
4344 + htab->root.sgot->output_offset
4345 + cur_off);
4346 outrel.r_info = ELF32_R_INFO (indx,
4347 R_NIOS2_TLS_TPREL);
4348
4349 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
4350 loc);
4351 htab->root.srelgot->reloc_count++;
4352 loc += sizeof (Elf32_External_Rela);
4353 }
4354 else
4355 bfd_put_32 (output_bfd, (tpoff (info, relocation)
4356 - TP_OFFSET),
4357 htab->root.sgot->contents + cur_off);
4358 cur_off += 4;
4359 }
4360
4361 if (h != NULL)
4362 h->got.offset |= 1;
4363 else
4364 local_got_offsets[r_symndx] |= 1;
4365 }
4366
4367 if ((tls_type & GOT_TLS_GD) && r_type != R_NIOS2_TLS_GD16)
4368 off += 8;
4369 relocation = htab->root.sgot->output_offset + off - got_base;
4370
4371 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4372 contents, rel->r_offset,
4373 relocation, rel->r_addend);
4374 }
4375
4376 break;
4377 case R_NIOS2_TLS_LE16:
4378 if (bfd_link_dll (info))
4379 {
4380 _bfd_error_handler
4381 /* xgettext:c-format */
4382 (_("%pB(%pA+%#" PRIx64 "): %s relocation not "
4383 "permitted in shared object"),
4384 input_bfd, input_section,
4385 (uint64_t) rel->r_offset, howto->name);
4386 return false;
4387 }
4388 else
4389 relocation = tpoff (info, relocation) - TP_OFFSET;
4390
4391 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4392 contents, rel->r_offset,
4393 relocation, rel->r_addend);
4394 break;
4395
4396 case R_NIOS2_BFD_RELOC_32:
4397 if (bfd_link_pic (info)
4398 && (input_section->flags & SEC_ALLOC) != 0
4399 && (h == NULL
4400 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4401 && !resolved_to_zero)
4402 || h->root.type != bfd_link_hash_undefweak))
4403 {
4404 Elf_Internal_Rela outrel;
4405 bfd_byte *loc;
4406 bool skip, relocate;
4407
4408 /* When generating a shared object, these relocations
4409 are copied into the output file to be resolved at run
4410 time. */
4411
4412 skip = false;
4413 relocate = false;
4414
4415 outrel.r_offset
4416 = _bfd_elf_section_offset (output_bfd, info,
4417 input_section, rel->r_offset);
4418 if (outrel.r_offset == (bfd_vma) -1)
4419 skip = true;
4420 else if (outrel.r_offset == (bfd_vma) -2)
4421 skip = true, relocate = true;
4422 outrel.r_offset += (input_section->output_section->vma
4423 + input_section->output_offset);
4424
4425 if (skip)
4426 memset (&outrel, 0, sizeof outrel);
4427 else if (h != NULL
4428 && h->dynindx != -1
4429 && (!bfd_link_pic (info)
4430 || !SYMBOLIC_BIND (info, h)
4431 || !h->def_regular))
4432 {
4433 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4434 outrel.r_addend = rel->r_addend;
4435 }
4436 else
4437 {
4438 /* This symbol is local, or marked to become local. */
4439 outrel.r_addend = relocation + rel->r_addend;
4440 relocate = true;
4441 outrel.r_info = ELF32_R_INFO (0, R_NIOS2_RELATIVE);
4442 }
4443
4444 sreloc = elf_section_data (input_section)->sreloc;
4445 if (sreloc == NULL)
4446 abort ();
4447
4448 loc = sreloc->contents;
4449 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
4450 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
4451
4452 /* This reloc will be computed at runtime, so there's no
4453 need to do anything now, except for R_NIOS2_BFD_RELOC_32
4454 relocations that have been turned into
4455 R_NIOS2_RELATIVE. */
4456 if (!relocate)
4457 break;
4458 }
4459
4460 r = _bfd_final_link_relocate (howto, input_bfd,
4461 input_section, contents,
4462 rel->r_offset, relocation,
4463 rel->r_addend);
4464 break;
4465
4466 case R_NIOS2_TLS_DTPREL:
4467 relocation -= dtpoff_base (info);
4468 /* Fall through. */
4469
4470 default:
4471 r = _bfd_final_link_relocate (howto, input_bfd,
4472 input_section, contents,
4473 rel->r_offset, relocation,
4474 rel->r_addend);
4475 break;
4476 }
4477 }
4478 else
4479 r = bfd_reloc_notsupported;
4480
4481 if (r != bfd_reloc_ok)
4482 {
4483 if (h != NULL)
4484 name = h->root.root.string;
4485 else
4486 {
4487 name = bfd_elf_string_from_elf_section (input_bfd,
4488 symtab_hdr->sh_link,
4489 sym->st_name);
4490 if (name == NULL || *name == '\0')
4491 name = bfd_section_name (sec);
4492 }
4493
4494 switch (r)
4495 {
4496 case bfd_reloc_overflow:
4497 (*info->callbacks->reloc_overflow) (info, NULL, name,
4498 howto->name, (bfd_vma) 0,
4499 input_bfd, input_section,
4500 rel->r_offset);
4501 break;
4502
4503 case bfd_reloc_undefined:
4504 (*info->callbacks->undefined_symbol) (info, name, input_bfd,
4505 input_section,
4506 rel->r_offset, true);
4507 break;
4508
4509 case bfd_reloc_outofrange:
4510 if (msg == NULL)
4511 msg = _("relocation out of range");
4512 break;
4513
4514 case bfd_reloc_notsupported:
4515 if (msg == NULL)
4516 msg = _("unsupported relocation");
4517 break;
4518
4519 case bfd_reloc_dangerous:
4520 if (msg == NULL)
4521 msg = _("dangerous relocation");
4522 break;
4523
4524 default:
4525 if (msg == NULL)
4526 msg = _("unknown error");
4527 break;
4528 }
4529
4530 if (msg)
4531 {
4532 (*info->callbacks->warning) (info, msg, name, input_bfd,
4533 input_section, rel->r_offset);
4534 free (msgbuf);
4535 return false;
4536 }
4537 }
4538 }
4539 return true;
4540 }
4541
4542 /* Implement elf-backend_section_flags:
4543 Convert NIOS2 specific section flags to bfd internal section flags. */
4544 static bool
nios2_elf32_section_flags(const Elf_Internal_Shdr * hdr)4545 nios2_elf32_section_flags (const Elf_Internal_Shdr *hdr)
4546 {
4547 if (hdr->sh_flags & SHF_NIOS2_GPREL)
4548 hdr->bfd_section->flags |= SEC_SMALL_DATA;
4549
4550 return true;
4551 }
4552
4553 /* Implement elf_backend_fake_sections:
4554 Set the correct type for an NIOS2 ELF section. We do this by the
4555 section name, which is a hack, but ought to work. */
4556 static bool
nios2_elf32_fake_sections(bfd * abfd ATTRIBUTE_UNUSED,Elf_Internal_Shdr * hdr,asection * sec)4557 nios2_elf32_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
4558 Elf_Internal_Shdr *hdr, asection *sec)
4559 {
4560 const char *name = bfd_section_name (sec);
4561
4562 if ((sec->flags & SEC_SMALL_DATA)
4563 || strcmp (name, ".sdata") == 0
4564 || strcmp (name, ".sbss") == 0
4565 || strcmp (name, ".lit4") == 0 || strcmp (name, ".lit8") == 0)
4566 hdr->sh_flags |= SHF_NIOS2_GPREL;
4567
4568 return true;
4569 }
4570
4571 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
4572 shortcuts to them in our hash table. */
4573 static bool
create_got_section(bfd * dynobj,struct bfd_link_info * info)4574 create_got_section (bfd *dynobj, struct bfd_link_info *info)
4575 {
4576 struct elf32_nios2_link_hash_table *htab;
4577 struct elf_link_hash_entry *h;
4578
4579 htab = elf32_nios2_hash_table (info);
4580
4581 if (! _bfd_elf_create_got_section (dynobj, info))
4582 return false;
4583
4584 /* In order for the two loads in .PLTresolve to share the same %hiadj,
4585 _GLOBAL_OFFSET_TABLE_ must be aligned to a 16-byte boundary. */
4586 if (!bfd_set_section_alignment (htab->root.sgotplt, 4))
4587 return false;
4588
4589 /* The Nios II ABI specifies that GOT-relative relocations are relative
4590 to the linker-created symbol _gp_got, rather than using
4591 _GLOBAL_OFFSET_TABLE_ directly. In particular, the latter always
4592 points to the base of the GOT while _gp_got may include a bias. */
4593 h = _bfd_elf_define_linkage_sym (dynobj, info, htab->root.sgotplt,
4594 "_gp_got");
4595 htab->h_gp_got = h;
4596 if (h == NULL)
4597 return false;
4598
4599 return true;
4600 }
4601
4602 /* Implement elf_backend_create_dynamic_sections:
4603 Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
4604 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
4605 hash table. */
4606 static bool
nios2_elf32_create_dynamic_sections(bfd * dynobj,struct bfd_link_info * info)4607 nios2_elf32_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
4608 {
4609 struct elf32_nios2_link_hash_table *htab;
4610
4611 htab = elf32_nios2_hash_table (info);
4612 if (!htab->root.sgot && !create_got_section (dynobj, info))
4613 return false;
4614
4615 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
4616 return false;
4617
4618 /* In order for the two loads in a shared object .PLTresolve to share the
4619 same %hiadj, the start of the PLT (as well as the GOT) must be aligned
4620 to a 16-byte boundary. This is because the addresses for these loads
4621 include the -(.plt+4) PIC correction. */
4622 return bfd_set_section_alignment (htab->root.splt, 4);
4623 }
4624
4625 /* Implement elf_backend_copy_indirect_symbol:
4626 Copy the extra info we tack onto an elf_link_hash_entry. */
4627 static void
nios2_elf32_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)4628 nios2_elf32_copy_indirect_symbol (struct bfd_link_info *info,
4629 struct elf_link_hash_entry *dir,
4630 struct elf_link_hash_entry *ind)
4631 {
4632 struct elf32_nios2_link_hash_entry *edir, *eind;
4633
4634 edir = (struct elf32_nios2_link_hash_entry *) dir;
4635 eind = (struct elf32_nios2_link_hash_entry *) ind;
4636
4637 if (ind->root.type == bfd_link_hash_indirect
4638 && dir->got.refcount <= 0)
4639 {
4640 edir->tls_type = eind->tls_type;
4641 eind->tls_type = GOT_UNKNOWN;
4642 }
4643
4644 edir->got_types_used |= eind->got_types_used;
4645
4646 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
4647 }
4648
4649 /* Set the right machine number for a NIOS2 ELF file. */
4650
4651 static bool
nios2_elf32_object_p(bfd * abfd)4652 nios2_elf32_object_p (bfd *abfd)
4653 {
4654 unsigned long mach;
4655
4656 mach = elf_elfheader (abfd)->e_flags;
4657
4658 switch (mach)
4659 {
4660 default:
4661 case EF_NIOS2_ARCH_R1:
4662 bfd_default_set_arch_mach (abfd, bfd_arch_nios2, bfd_mach_nios2r1);
4663 break;
4664 case EF_NIOS2_ARCH_R2:
4665 bfd_default_set_arch_mach (abfd, bfd_arch_nios2, bfd_mach_nios2r2);
4666 break;
4667 }
4668
4669 return true;
4670 }
4671
4672 /* Implement elf_backend_check_relocs:
4673 Look through the relocs for a section during the first phase. */
4674 static bool
nios2_elf32_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)4675 nios2_elf32_check_relocs (bfd *abfd, struct bfd_link_info *info,
4676 asection *sec, const Elf_Internal_Rela *relocs)
4677 {
4678 Elf_Internal_Shdr *symtab_hdr;
4679 struct elf_link_hash_entry **sym_hashes;
4680 const Elf_Internal_Rela *rel;
4681 const Elf_Internal_Rela *rel_end;
4682 struct elf32_nios2_link_hash_table *htab;
4683 asection *sreloc = NULL;
4684 bfd_signed_vma *local_got_refcounts;
4685
4686 if (bfd_link_relocatable (info))
4687 return true;
4688
4689 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4690 sym_hashes = elf_sym_hashes (abfd);
4691 local_got_refcounts = elf_local_got_refcounts (abfd);
4692
4693 htab = elf32_nios2_hash_table (info);
4694
4695 rel_end = relocs + sec->reloc_count;
4696 for (rel = relocs; rel < rel_end; rel++)
4697 {
4698 unsigned int r_type;
4699 struct elf_link_hash_entry *h;
4700 unsigned long r_symndx;
4701
4702 r_symndx = ELF32_R_SYM (rel->r_info);
4703 if (r_symndx < symtab_hdr->sh_info)
4704 h = NULL;
4705 else
4706 {
4707 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4708 while (h->root.type == bfd_link_hash_indirect
4709 || h->root.type == bfd_link_hash_warning)
4710 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4711 }
4712
4713 r_type = ELF32_R_TYPE (rel->r_info);
4714
4715 switch (r_type)
4716 {
4717 case R_NIOS2_GOT16:
4718 case R_NIOS2_GOT_LO:
4719 case R_NIOS2_GOT_HA:
4720 case R_NIOS2_CALL16:
4721 case R_NIOS2_CALL_LO:
4722 case R_NIOS2_CALL_HA:
4723 case R_NIOS2_TLS_GD16:
4724 case R_NIOS2_TLS_IE16:
4725 /* This symbol requires a global offset table entry. */
4726 {
4727 int tls_type, old_tls_type;
4728
4729 switch (r_type)
4730 {
4731 default:
4732 case R_NIOS2_GOT16:
4733 case R_NIOS2_GOT_LO:
4734 case R_NIOS2_GOT_HA:
4735 case R_NIOS2_CALL16:
4736 case R_NIOS2_CALL_LO:
4737 case R_NIOS2_CALL_HA:
4738 tls_type = GOT_NORMAL;
4739 break;
4740 case R_NIOS2_TLS_GD16:
4741 tls_type = GOT_TLS_GD;
4742 break;
4743 case R_NIOS2_TLS_IE16:
4744 tls_type = GOT_TLS_IE;
4745 break;
4746 }
4747
4748 if (h != NULL)
4749 {
4750 struct elf32_nios2_link_hash_entry *eh
4751 = (struct elf32_nios2_link_hash_entry *)h;
4752 h->got.refcount++;
4753 old_tls_type = elf32_nios2_hash_entry(h)->tls_type;
4754 if (r_type == R_NIOS2_CALL16
4755 || r_type == R_NIOS2_CALL_LO
4756 || r_type == R_NIOS2_CALL_HA)
4757 {
4758 /* Make sure a plt entry is created for this symbol if
4759 it turns out to be a function defined by a dynamic
4760 object. */
4761 h->plt.refcount++;
4762 h->needs_plt = 1;
4763 h->type = STT_FUNC;
4764 eh->got_types_used |= CALL_USED;
4765 }
4766 else
4767 eh->got_types_used |= GOT_USED;
4768 }
4769 else
4770 {
4771 /* This is a global offset table entry for a local symbol. */
4772 if (local_got_refcounts == NULL)
4773 {
4774 bfd_size_type size;
4775
4776 size = symtab_hdr->sh_info;
4777 size *= (sizeof (bfd_signed_vma) + sizeof (char));
4778 local_got_refcounts
4779 = ((bfd_signed_vma *) bfd_zalloc (abfd, size));
4780 if (local_got_refcounts == NULL)
4781 return false;
4782 elf_local_got_refcounts (abfd) = local_got_refcounts;
4783 elf32_nios2_local_got_tls_type (abfd)
4784 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
4785 }
4786 local_got_refcounts[r_symndx]++;
4787 old_tls_type = elf32_nios2_local_got_tls_type (abfd) [r_symndx];
4788 }
4789
4790 /* We will already have issued an error message if there is a
4791 TLS / non-TLS mismatch, based on the symbol type. We don't
4792 support any linker relaxations. So just combine any TLS
4793 types needed. */
4794 if (old_tls_type != GOT_UNKNOWN && old_tls_type != GOT_NORMAL
4795 && tls_type != GOT_NORMAL)
4796 tls_type |= old_tls_type;
4797
4798 if (old_tls_type != tls_type)
4799 {
4800 if (h != NULL)
4801 elf32_nios2_hash_entry (h)->tls_type = tls_type;
4802 else
4803 elf32_nios2_local_got_tls_type (abfd) [r_symndx] = tls_type;
4804 }
4805 }
4806 make_got:
4807 if (htab->root.sgot == NULL)
4808 {
4809 if (htab->root.dynobj == NULL)
4810 htab->root.dynobj = abfd;
4811 if (!create_got_section (htab->root.dynobj, info))
4812 return false;
4813 }
4814 break;
4815
4816 case R_NIOS2_TLS_LDM16:
4817 htab->tls_ldm_got.refcount++;
4818 goto make_got;
4819
4820 /* This relocation describes the C++ object vtable hierarchy.
4821 Reconstruct it for later use during GC. */
4822 case R_NIOS2_GNU_VTINHERIT:
4823 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4824 return false;
4825 break;
4826
4827 /* This relocation describes which C++ vtable entries are actually
4828 used. Record for later use during GC. */
4829 case R_NIOS2_GNU_VTENTRY:
4830 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
4831 return false;
4832 break;
4833
4834 case R_NIOS2_BFD_RELOC_32:
4835 case R_NIOS2_CALL26:
4836 case R_NIOS2_CALL26_NOAT:
4837 case R_NIOS2_HIADJ16:
4838 case R_NIOS2_LO16:
4839
4840 if (h != NULL)
4841 {
4842 /* If this reloc is in a read-only section, we might
4843 need a copy reloc. We can't check reliably at this
4844 stage whether the section is read-only, as input
4845 sections have not yet been mapped to output sections.
4846 Tentatively set the flag for now, and correct in
4847 adjust_dynamic_symbol. */
4848 if (!bfd_link_pic (info))
4849 h->non_got_ref = 1;
4850
4851 /* Make sure a plt entry is created for this symbol if it
4852 turns out to be a function defined by a dynamic object. */
4853 h->plt.refcount++;
4854
4855 if (r_type == R_NIOS2_CALL26 || r_type == R_NIOS2_CALL26_NOAT)
4856 h->needs_plt = 1;
4857 }
4858
4859 /* If we are creating a shared library, we need to copy the
4860 reloc into the shared library. */
4861 if (bfd_link_pic (info)
4862 && (sec->flags & SEC_ALLOC) != 0
4863 && (r_type == R_NIOS2_BFD_RELOC_32
4864 || (h != NULL && ! h->needs_plt
4865 && (! SYMBOLIC_BIND (info, h) || ! h->def_regular))))
4866 {
4867 struct elf_dyn_relocs *p;
4868 struct elf_dyn_relocs **head;
4869
4870 /* When creating a shared object, we must copy these
4871 reloc types into the output file. We create a reloc
4872 section in dynobj and make room for this reloc. */
4873 if (sreloc == NULL)
4874 {
4875 if (htab->root.dynobj == NULL)
4876 htab->root.dynobj = abfd;
4877
4878 sreloc = _bfd_elf_make_dynamic_reloc_section
4879 (sec, htab->root.dynobj, 2, abfd, true);
4880 if (sreloc == NULL)
4881 return false;
4882 }
4883
4884 /* If this is a global symbol, we count the number of
4885 relocations we need for this symbol. */
4886 if (h != NULL)
4887 head = &h->dyn_relocs;
4888 else
4889 {
4890 /* Track dynamic relocs needed for local syms too.
4891 We really need local syms available to do this
4892 easily. Oh well. */
4893
4894 asection *s;
4895 void *vpp;
4896 Elf_Internal_Sym *isym;
4897
4898 isym = bfd_sym_from_r_symndx (&htab->root.sym_cache,
4899 abfd, r_symndx);
4900 if (isym == NULL)
4901 return false;
4902
4903 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
4904 if (s == NULL)
4905 s = sec;
4906
4907 vpp = &elf_section_data (s)->local_dynrel;
4908 head = (struct elf_dyn_relocs **) vpp;
4909 }
4910
4911 p = *head;
4912 if (p == NULL || p->sec != sec)
4913 {
4914 size_t amt = sizeof *p;
4915 p = ((struct elf_dyn_relocs *)
4916 bfd_alloc (htab->root.dynobj, amt));
4917 if (p == NULL)
4918 return false;
4919 p->next = *head;
4920 *head = p;
4921 p->sec = sec;
4922 p->count = 0;
4923 p->pc_count = 0;
4924 }
4925
4926 p->count += 1;
4927
4928 }
4929 break;
4930 }
4931 }
4932
4933 return true;
4934 }
4935
4936
4937 /* Implement elf_backend_gc_mark_hook:
4938 Return the section that should be marked against GC for a given
4939 relocation. */
4940 static asection *
nios2_elf32_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)4941 nios2_elf32_gc_mark_hook (asection *sec,
4942 struct bfd_link_info *info,
4943 Elf_Internal_Rela *rel,
4944 struct elf_link_hash_entry *h,
4945 Elf_Internal_Sym *sym)
4946 {
4947 if (h != NULL)
4948 switch (ELF32_R_TYPE (rel->r_info))
4949 {
4950 case R_NIOS2_GNU_VTINHERIT:
4951 case R_NIOS2_GNU_VTENTRY:
4952 return NULL;
4953 }
4954 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
4955 }
4956
4957 /* Implement elf_backend_finish_dynamic_symbols:
4958 Finish up dynamic symbol handling. We set the contents of various
4959 dynamic sections here. */
4960 static bool
nios2_elf32_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)4961 nios2_elf32_finish_dynamic_symbol (bfd *output_bfd,
4962 struct bfd_link_info *info,
4963 struct elf_link_hash_entry *h,
4964 Elf_Internal_Sym *sym)
4965 {
4966 struct elf32_nios2_link_hash_table *htab;
4967 struct elf32_nios2_link_hash_entry *eh
4968 = (struct elf32_nios2_link_hash_entry *)h;
4969 int use_plt;
4970
4971 htab = elf32_nios2_hash_table (info);
4972
4973 if (h->plt.offset != (bfd_vma) -1)
4974 {
4975 asection *splt;
4976 asection *sgotplt;
4977 asection *srela;
4978 bfd_vma plt_index;
4979 bfd_vma got_offset;
4980 Elf_Internal_Rela rela;
4981 bfd_byte *loc;
4982 bfd_vma got_address;
4983
4984 /* This symbol has an entry in the procedure linkage table. Set
4985 it up. */
4986 BFD_ASSERT (h->dynindx != -1);
4987 splt = htab->root.splt;
4988 sgotplt = htab->root.sgotplt;
4989 srela = htab->root.srelplt;
4990 BFD_ASSERT (splt != NULL && sgotplt != NULL && srela != NULL);
4991
4992 /* Emit the PLT entry. */
4993 if (bfd_link_pic (info))
4994 {
4995 nios2_elf32_install_data (splt, nios2_so_plt_entry, h->plt.offset,
4996 3);
4997 plt_index = (h->plt.offset - 24) / 12;
4998 got_offset = (plt_index + 3) * 4;
4999 nios2_elf32_install_imm16 (splt, h->plt.offset,
5000 hiadj(plt_index * 4));
5001 nios2_elf32_install_imm16 (splt, h->plt.offset + 4,
5002 (plt_index * 4) & 0xffff);
5003 nios2_elf32_install_imm16 (splt, h->plt.offset + 8,
5004 0xfff4 - h->plt.offset);
5005 got_address = (sgotplt->output_section->vma + sgotplt->output_offset
5006 + got_offset);
5007
5008 /* Fill in the entry in the global offset table. There are no
5009 res_n slots for a shared object PLT, instead the .got.plt entries
5010 point to the PLT entries. */
5011 bfd_put_32 (output_bfd,
5012 splt->output_section->vma + splt->output_offset
5013 + h->plt.offset, sgotplt->contents + got_offset);
5014 }
5015 else
5016 {
5017 plt_index = (h->plt.offset - 28 - htab->res_n_size) / 12;
5018 got_offset = (plt_index + 3) * 4;
5019
5020 nios2_elf32_install_data (splt, nios2_plt_entry, h->plt.offset, 3);
5021 got_address = (sgotplt->output_section->vma + sgotplt->output_offset
5022 + got_offset);
5023 nios2_elf32_install_imm16 (splt, h->plt.offset, hiadj(got_address));
5024 nios2_elf32_install_imm16 (splt, h->plt.offset + 4,
5025 got_address & 0xffff);
5026
5027 /* Fill in the entry in the global offset table. */
5028 bfd_put_32 (output_bfd,
5029 splt->output_section->vma + splt->output_offset
5030 + plt_index * 4, sgotplt->contents + got_offset);
5031 }
5032
5033 /* Fill in the entry in the .rela.plt section. */
5034 rela.r_offset = got_address;
5035 rela.r_info = ELF32_R_INFO (h->dynindx, R_NIOS2_JUMP_SLOT);
5036 rela.r_addend = 0;
5037 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
5038 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5039
5040 if (!h->def_regular)
5041 {
5042 /* Mark the symbol as undefined, rather than as defined in
5043 the .plt section. Leave the value alone. */
5044 sym->st_shndx = SHN_UNDEF;
5045 /* If the symbol is weak, we do need to clear the value.
5046 Otherwise, the PLT entry would provide a definition for
5047 the symbol even if the symbol wasn't defined anywhere,
5048 and so the symbol would never be NULL. */
5049 if (!h->ref_regular_nonweak)
5050 sym->st_value = 0;
5051 }
5052 }
5053
5054 use_plt = (eh->got_types_used == CALL_USED
5055 && h->plt.offset != (bfd_vma) -1);
5056
5057 if (!use_plt && h->got.offset != (bfd_vma) -1
5058 && (elf32_nios2_hash_entry (h)->tls_type & GOT_TLS_GD) == 0
5059 && (elf32_nios2_hash_entry (h)->tls_type & GOT_TLS_IE) == 0)
5060 {
5061 asection *sgot;
5062 asection *srela;
5063 Elf_Internal_Rela rela;
5064 bfd_byte *loc;
5065 bfd_vma offset;
5066
5067 /* This symbol has an entry in the global offset table. Set it
5068 up. */
5069 sgot = htab->root.sgot;
5070 srela = htab->root.srelgot;
5071 BFD_ASSERT (sgot != NULL && srela != NULL);
5072
5073 offset = (h->got.offset & ~(bfd_vma) 1);
5074 rela.r_offset = (sgot->output_section->vma
5075 + sgot->output_offset + offset);
5076
5077 /* If this is a -Bsymbolic link, and the symbol is defined
5078 locally, we just want to emit a RELATIVE reloc. Likewise if
5079 the symbol was forced to be local because of a version file.
5080 The entry in the global offset table will already have been
5081 initialized in the relocate_section function. */
5082
5083 if (bfd_link_pic (info) && SYMBOL_REFERENCES_LOCAL (info, h))
5084 {
5085 rela.r_info = ELF32_R_INFO (0, R_NIOS2_RELATIVE);
5086 rela.r_addend = bfd_get_signed_32 (output_bfd,
5087 (sgot->contents + offset));
5088 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + offset);
5089 }
5090 else
5091 {
5092 bfd_put_32 (output_bfd, (bfd_vma) 0,
5093 sgot->contents + offset);
5094 rela.r_info = ELF32_R_INFO (h->dynindx, R_NIOS2_GLOB_DAT);
5095 rela.r_addend = 0;
5096 }
5097
5098 loc = srela->contents;
5099 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
5100 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5101 }
5102
5103 if (use_plt && h->got.offset != (bfd_vma) -1)
5104 {
5105 bfd_vma offset = (h->got.offset & ~(bfd_vma) 1);
5106 asection *sgot = htab->root.sgot;
5107 asection *splt = htab->root.splt;
5108 bfd_put_32 (output_bfd, (splt->output_section->vma + splt->output_offset
5109 + h->plt.offset),
5110 sgot->contents + offset);
5111 }
5112
5113 if (h->needs_copy)
5114 {
5115 asection *s;
5116 Elf_Internal_Rela rela;
5117 bfd_byte *loc;
5118
5119 /* This symbol needs a copy reloc. Set it up. */
5120 BFD_ASSERT (h->dynindx != -1
5121 && (h->root.type == bfd_link_hash_defined
5122 || h->root.type == bfd_link_hash_defweak));
5123
5124 rela.r_offset = (h->root.u.def.value
5125 + h->root.u.def.section->output_section->vma
5126 + h->root.u.def.section->output_offset);
5127 rela.r_info = ELF32_R_INFO (h->dynindx, R_NIOS2_COPY);
5128 rela.r_addend = 0;
5129 if (h->root.u.def.section == htab->root.sdynrelro)
5130 s = htab->root.sreldynrelro;
5131 else
5132 s = htab->root.srelbss;
5133 BFD_ASSERT (s != NULL);
5134 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
5135 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5136 }
5137
5138 /* Mark _DYNAMIC, _GLOBAL_OFFSET_TABLE_, and _gp_got as absolute. */
5139 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
5140 || h == htab->root.hgot
5141 || h == htab->h_gp_got)
5142 sym->st_shndx = SHN_ABS;
5143
5144 return true;
5145 }
5146
5147 /* Implement elf_backend_finish_dynamic_sections. */
5148 static bool
nios2_elf32_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)5149 nios2_elf32_finish_dynamic_sections (bfd *output_bfd,
5150 struct bfd_link_info *info)
5151 {
5152 asection *sgotplt;
5153 asection *sdyn;
5154 struct elf32_nios2_link_hash_table *htab;
5155
5156 htab = elf32_nios2_hash_table (info);
5157 sgotplt = htab->root.sgotplt;
5158 sdyn = NULL;
5159
5160 if (htab->root.dynamic_sections_created)
5161 {
5162 asection *splt;
5163 Elf32_External_Dyn *dyncon, *dynconend;
5164
5165 splt = htab->root.splt;
5166 sdyn = bfd_get_linker_section (htab->root.dynobj, ".dynamic");
5167 BFD_ASSERT (splt != NULL && sdyn != NULL && sgotplt != NULL);
5168
5169 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5170 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5171 for (; dyncon < dynconend; dyncon++)
5172 {
5173 Elf_Internal_Dyn dyn;
5174 asection *s;
5175
5176 bfd_elf32_swap_dyn_in (htab->root.dynobj, dyncon, &dyn);
5177
5178 switch (dyn.d_tag)
5179 {
5180 default:
5181 break;
5182
5183 case DT_PLTGOT:
5184 s = htab->root.sgotplt;
5185 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5186 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5187 break;
5188
5189 case DT_JMPREL:
5190 s = htab->root.srelplt;
5191 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5192 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5193 break;
5194
5195 case DT_PLTRELSZ:
5196 s = htab->root.srelplt;
5197 dyn.d_un.d_val = s->size;
5198 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5199 break;
5200
5201 case DT_NIOS2_GP:
5202 s = htab->root.sgotplt;
5203 dyn.d_un.d_ptr
5204 = s->output_section->vma + s->output_offset + 0x7ff0;
5205 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5206 break;
5207 }
5208 }
5209
5210 /* Fill in the first entry in the procedure linkage table. */
5211 if (splt->size > 0)
5212 {
5213 bfd_vma got_address = (sgotplt->output_section->vma
5214 + sgotplt->output_offset);
5215 if (bfd_link_pic (info))
5216 {
5217 bfd_vma got_pcrel = got_address - (splt->output_section->vma
5218 + splt->output_offset);
5219 /* Both GOT and PLT must be aligned to a 16-byte boundary
5220 for the two loads to share the %hiadj part. The 4-byte
5221 offset for nextpc is accounted for in the %lo offsets
5222 on the loads. */
5223 BFD_ASSERT ((got_pcrel & 0xf) == 0);
5224 nios2_elf32_install_data (splt, nios2_so_plt0_entry, 0, 6);
5225 nios2_elf32_install_imm16 (splt, 4, hiadj (got_pcrel));
5226 nios2_elf32_install_imm16 (splt, 12, got_pcrel & 0xffff);
5227 nios2_elf32_install_imm16 (splt, 16, (got_pcrel + 4) & 0xffff);
5228 }
5229 else
5230 {
5231 /* Divide by 4 here, not 3 because we already corrected for the
5232 res_N branches. */
5233 bfd_vma res_size = (splt->size - 28) / 4;
5234 bfd_vma res_start = (splt->output_section->vma
5235 + splt->output_offset);
5236 bfd_vma res_offset;
5237
5238 for (res_offset = 0; res_offset < res_size; res_offset += 4)
5239 bfd_put_32 (output_bfd,
5240 6 | ((res_size - (res_offset + 4)) << 6),
5241 splt->contents + res_offset);
5242
5243 /* The GOT must be aligned to a 16-byte boundary for the
5244 two loads to share the same %hiadj part. */
5245 BFD_ASSERT ((got_address & 0xf) == 0);
5246
5247 nios2_elf32_install_data (splt, nios2_plt0_entry, res_size, 7);
5248 nios2_elf32_install_imm16 (splt, res_size, hiadj (res_start));
5249 nios2_elf32_install_imm16 (splt, res_size + 4,
5250 res_start & 0xffff);
5251 nios2_elf32_install_imm16 (splt, res_size + 12,
5252 hiadj (got_address));
5253 nios2_elf32_install_imm16 (splt, res_size + 16,
5254 (got_address + 4) & 0xffff);
5255 nios2_elf32_install_imm16 (splt, res_size + 20,
5256 (got_address + 8) & 0xffff);
5257 }
5258 }
5259 }
5260
5261 /* Fill in the first three entries in the global offset table. */
5262 if (sgotplt != NULL && sgotplt->size > 0)
5263 {
5264 if (sdyn == NULL)
5265 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents);
5266 else
5267 bfd_put_32 (output_bfd,
5268 sdyn->output_section->vma + sdyn->output_offset,
5269 sgotplt->contents);
5270 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 4);
5271 bfd_put_32 (output_bfd, (bfd_vma) 0, sgotplt->contents + 8);
5272
5273 if (sgotplt->output_section != bfd_abs_section_ptr)
5274 elf_section_data (sgotplt->output_section)->this_hdr.sh_entsize = 4;
5275 }
5276
5277 return true;
5278 }
5279
5280 /* Implement elf_backend_adjust_dynamic_symbol:
5281 Adjust a symbol defined by a dynamic object and referenced by a
5282 regular object. The current definition is in some section of the
5283 dynamic object, but we're not including those sections. We have to
5284 change the definition to something the rest of the link can
5285 understand. */
5286 static bool
nios2_elf32_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)5287 nios2_elf32_adjust_dynamic_symbol (struct bfd_link_info *info,
5288 struct elf_link_hash_entry *h)
5289 {
5290 struct elf32_nios2_link_hash_table *htab;
5291 bfd *dynobj;
5292 asection *s, *srel;
5293 unsigned align2;
5294
5295 htab = elf32_nios2_hash_table (info);
5296 dynobj = htab->root.dynobj;
5297
5298 /* Make sure we know what is going on here. */
5299 BFD_ASSERT (dynobj != NULL
5300 && (h->needs_plt
5301 || h->is_weakalias
5302 || (h->def_dynamic
5303 && h->ref_regular
5304 && !h->def_regular)));
5305
5306 /* If this is a function, put it in the procedure linkage table. We
5307 will fill in the contents of the procedure linkage table later,
5308 when we know the address of the .got section. */
5309 if (h->type == STT_FUNC || h->needs_plt)
5310 {
5311 if (h->plt.refcount <= 0
5312 || SYMBOL_CALLS_LOCAL (info, h)
5313 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
5314 && h->root.type == bfd_link_hash_undefweak))
5315 {
5316 /* This case can occur if we saw a PLT reloc in an input
5317 file, but the symbol was never referred to by a dynamic
5318 object, or if all references were garbage collected. In
5319 such a case, we don't actually need to build a procedure
5320 linkage table, and we can just do a PCREL reloc instead. */
5321 h->plt.offset = (bfd_vma) -1;
5322 h->needs_plt = 0;
5323 }
5324
5325 return true;
5326 }
5327
5328 /* Reinitialize the plt offset now that it is not used as a reference
5329 count any more. */
5330 h->plt.offset = (bfd_vma) -1;
5331
5332 /* If this is a weak symbol, and there is a real definition, the
5333 processor independent code will have arranged for us to see the
5334 real definition first, and we can just use the same value. */
5335 if (h->is_weakalias)
5336 {
5337 struct elf_link_hash_entry *def = weakdef (h);
5338 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
5339 h->root.u.def.section = def->root.u.def.section;
5340 h->root.u.def.value = def->root.u.def.value;
5341 return true;
5342 }
5343
5344 /* If there are no non-GOT references, we do not need a copy
5345 relocation. */
5346 if (!h->non_got_ref)
5347 return true;
5348
5349 /* This is a reference to a symbol defined by a dynamic object which
5350 is not a function.
5351 If we are creating a shared library, we must presume that the
5352 only references to the symbol are via the global offset table.
5353 For such cases we need not do anything here; the relocations will
5354 be handled correctly by relocate_section. */
5355 if (bfd_link_pic (info))
5356 return true;
5357
5358 if (h->size == 0)
5359 {
5360 _bfd_error_handler (_("dynamic variable `%s' is zero size"),
5361 h->root.root.string);
5362 return true;
5363 }
5364
5365 /* We must allocate the symbol in our .dynbss section, which will
5366 become part of the .bss section of the executable. There will be
5367 an entry for this symbol in the .dynsym section. The dynamic
5368 object will contain position independent code, so all references
5369 from the dynamic object to this symbol will go through the global
5370 offset table. The dynamic linker will use the .dynsym entry to
5371 determine the address it must put in the global offset table, so
5372 both the dynamic object and the regular object will refer to the
5373 same memory location for the variable. */
5374 /* We must generate a R_NIOS2_COPY reloc to tell the dynamic linker to
5375 copy the initial value out of the dynamic object and into the
5376 runtime process image. We need to remember the offset into the
5377 .rela.bss section we are going to use. */
5378 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
5379 {
5380 s = htab->root.sdynrelro;
5381 srel = htab->root.sreldynrelro;
5382 }
5383 else
5384 {
5385 s = htab->root.sdynbss;
5386 srel = htab->root.srelbss;
5387 }
5388 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
5389 {
5390 srel->size += sizeof (Elf32_External_Rela);
5391 h->needs_copy = 1;
5392 }
5393
5394 align2 = bfd_log2 (h->size);
5395 if (align2 > h->root.u.def.section->alignment_power)
5396 align2 = h->root.u.def.section->alignment_power;
5397
5398 /* Align dynbss. */
5399 s->size = BFD_ALIGN (s->size, (bfd_size_type)1 << align2);
5400 if (align2 > bfd_section_alignment (s)
5401 && !bfd_set_section_alignment (s, align2))
5402 return false;
5403
5404 /* Define the symbol as being at this point in the section. */
5405 h->root.u.def.section = s;
5406 h->root.u.def.value = s->size;
5407
5408 /* Increment the section size to make room for the symbol. */
5409 s->size += h->size;
5410
5411 return true;
5412 }
5413
5414 /* Worker function for nios2_elf32_size_dynamic_sections. */
5415 static bool
adjust_dynrelocs(struct elf_link_hash_entry * h,void * inf)5416 adjust_dynrelocs (struct elf_link_hash_entry *h, void *inf)
5417 {
5418 struct bfd_link_info *info;
5419 struct elf32_nios2_link_hash_table *htab;
5420
5421 if (h->root.type == bfd_link_hash_indirect)
5422 return true;
5423
5424 if (h->root.type == bfd_link_hash_warning)
5425 /* When warning symbols are created, they **replace** the "real"
5426 entry in the hash table, thus we never get to see the real
5427 symbol in a hash traversal. So look at it now. */
5428 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5429
5430 info = (struct bfd_link_info *) inf;
5431 htab = elf32_nios2_hash_table (info);
5432
5433 if (h->plt.offset != (bfd_vma)-1)
5434 h->plt.offset += htab->res_n_size;
5435 if (htab->root.splt == h->root.u.def.section)
5436 h->root.u.def.value += htab->res_n_size;
5437
5438 return true;
5439 }
5440
5441 /* Another worker function for nios2_elf32_size_dynamic_sections.
5442 Allocate space in .plt, .got and associated reloc sections for
5443 dynamic relocs. */
5444 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)5445 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
5446 {
5447 struct bfd_link_info *info;
5448 struct elf32_nios2_link_hash_table *htab;
5449 struct elf32_nios2_link_hash_entry *eh;
5450 struct elf_dyn_relocs *p;
5451 int use_plt;
5452
5453 if (h->root.type == bfd_link_hash_indirect)
5454 return true;
5455
5456 if (h->root.type == bfd_link_hash_warning)
5457 /* When warning symbols are created, they **replace** the "real"
5458 entry in the hash table, thus we never get to see the real
5459 symbol in a hash traversal. So look at it now. */
5460 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5461
5462 info = (struct bfd_link_info *) inf;
5463 htab = elf32_nios2_hash_table (info);
5464
5465 if (htab->root.dynamic_sections_created
5466 && h->plt.refcount > 0)
5467 {
5468 /* Make sure this symbol is output as a dynamic symbol.
5469 Undefined weak syms won't yet be marked as dynamic. */
5470 if (h->dynindx == -1
5471 && !h->forced_local
5472 && !bfd_elf_link_record_dynamic_symbol (info, h))
5473 return false;
5474
5475 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h))
5476 {
5477 asection *s = htab->root.splt;
5478
5479 /* Allocate room for the header. */
5480 if (s->size == 0)
5481 {
5482 if (bfd_link_pic (info))
5483 s->size = 24;
5484 else
5485 s->size = 28;
5486 }
5487
5488 h->plt.offset = s->size;
5489
5490 /* If this symbol is not defined in a regular file, and we are
5491 not generating a shared library, then set the symbol to this
5492 location in the .plt. This is required to make function
5493 pointers compare as equal between the normal executable and
5494 the shared library. */
5495 if (! bfd_link_pic (info)
5496 && !h->def_regular)
5497 {
5498 h->root.u.def.section = s;
5499 h->root.u.def.value = h->plt.offset;
5500 }
5501
5502 /* Make room for this entry. */
5503 s->size += 12;
5504
5505 /* We also need to make an entry in the .rela.plt section. */
5506 htab->root.srelplt->size += sizeof (Elf32_External_Rela);
5507
5508 /* And the .got.plt section. */
5509 htab->root.sgotplt->size += 4;
5510 }
5511 else
5512 {
5513 h->plt.offset = (bfd_vma) -1;
5514 h->needs_plt = 0;
5515 }
5516 }
5517 else
5518 {
5519 h->plt.offset = (bfd_vma) -1;
5520 h->needs_plt = 0;
5521 }
5522
5523 eh = (struct elf32_nios2_link_hash_entry *) h;
5524 use_plt = (eh->got_types_used == CALL_USED
5525 && h->plt.offset != (bfd_vma) -1);
5526
5527 if (h->got.refcount > 0)
5528 {
5529 asection *s;
5530 bool dyn;
5531 int tls_type = eh->tls_type;
5532 int indx;
5533
5534 /* Make sure this symbol is output as a dynamic symbol.
5535 Undefined weak syms won't yet be marked as dynamic. */
5536 if (h->dynindx == -1
5537 && !h->forced_local
5538 && !bfd_elf_link_record_dynamic_symbol (info, h))
5539 return false;
5540
5541 s = htab->root.sgot;
5542 h->got.offset = s->size;
5543
5544 if (tls_type == GOT_UNKNOWN)
5545 abort ();
5546
5547 if (tls_type == GOT_NORMAL)
5548 /* Non-TLS symbols need one GOT slot. */
5549 s->size += 4;
5550 else
5551 {
5552 if (tls_type & GOT_TLS_GD)
5553 /* R_NIOS2_TLS_GD16 needs 2 consecutive GOT slots. */
5554 s->size += 8;
5555 if (tls_type & GOT_TLS_IE)
5556 /* R_NIOS2_TLS_IE16 needs one GOT slot. */
5557 s->size += 4;
5558 }
5559
5560 dyn = htab->root.dynamic_sections_created;
5561
5562 indx = 0;
5563 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
5564 && (!bfd_link_pic (info)
5565 || !SYMBOL_REFERENCES_LOCAL (info, h)))
5566 indx = h->dynindx;
5567
5568 if (tls_type != GOT_NORMAL
5569 && (bfd_link_pic (info) || indx != 0)
5570 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
5571 || h->root.type != bfd_link_hash_undefweak))
5572 {
5573 if (tls_type & GOT_TLS_IE)
5574 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5575
5576 if (tls_type & GOT_TLS_GD)
5577 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5578
5579 if ((tls_type & GOT_TLS_GD) && indx != 0)
5580 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5581 }
5582 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
5583 || h->root.type != bfd_link_hash_undefweak)
5584 && !use_plt
5585 && (bfd_link_pic (info)
5586 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
5587 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5588 }
5589 else
5590 h->got.offset = (bfd_vma) -1;
5591
5592 if (h->dyn_relocs == NULL)
5593 return true;
5594
5595 /* In the shared -Bsymbolic case, discard space allocated for
5596 dynamic pc-relative relocs against symbols which turn out to be
5597 defined in regular objects. For the normal shared case, discard
5598 space for pc-relative relocs that have become local due to symbol
5599 visibility changes. */
5600
5601 if (bfd_link_pic (info))
5602 {
5603 if (h->def_regular
5604 && (h->forced_local || SYMBOLIC_BIND (info, h)))
5605 {
5606 struct elf_dyn_relocs **pp;
5607
5608 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
5609 {
5610 p->count -= p->pc_count;
5611 p->pc_count = 0;
5612 if (p->count == 0)
5613 *pp = p->next;
5614 else
5615 pp = &p->next;
5616 }
5617 }
5618
5619 /* Also discard relocs on undefined weak syms with non-default
5620 visibility. */
5621 if (h->dyn_relocs != NULL
5622 && h->root.type == bfd_link_hash_undefweak)
5623 {
5624 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
5625 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
5626 h->dyn_relocs = NULL;
5627
5628 /* Make sure undefined weak symbols are output as a dynamic
5629 symbol in PIEs. */
5630 else if (h->dynindx == -1
5631 && !h->forced_local
5632 && !bfd_elf_link_record_dynamic_symbol (info, h))
5633 return false;
5634 }
5635 }
5636 else
5637 {
5638 /* For the non-shared case, discard space for relocs against
5639 symbols which turn out to need copy relocs or are not
5640 dynamic. */
5641
5642 if (!h->non_got_ref
5643 && ((h->def_dynamic && !h->def_regular)
5644 || (htab->root.dynamic_sections_created
5645 && (h->root.type == bfd_link_hash_undefweak
5646 || h->root.type == bfd_link_hash_undefined))))
5647 {
5648 /* Make sure this symbol is output as a dynamic symbol.
5649 Undefined weak syms won't yet be marked as dynamic. */
5650 if (h->dynindx == -1
5651 && !h->forced_local
5652 && !bfd_elf_link_record_dynamic_symbol (info, h))
5653 return false;
5654
5655 /* If that succeeded, we know we'll be keeping all the
5656 relocs. */
5657 if (h->dynindx != -1)
5658 goto keep;
5659 }
5660
5661 h->dyn_relocs = NULL;
5662
5663 keep: ;
5664 }
5665
5666 /* Finally, allocate space. */
5667 for (p = h->dyn_relocs; p != NULL; p = p->next)
5668 {
5669 asection *sreloc = elf_section_data (p->sec)->sreloc;
5670 sreloc->size += p->count * sizeof (Elf32_External_Rela);
5671 }
5672
5673 return true;
5674 }
5675
5676 /* Implement elf_backend_size_dynamic_sections:
5677 Set the sizes of the dynamic sections. */
5678 static bool
nios2_elf32_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)5679 nios2_elf32_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
5680 struct bfd_link_info *info)
5681 {
5682 bfd *dynobj;
5683 asection *s;
5684 bool relocs;
5685 bfd *ibfd;
5686 struct elf32_nios2_link_hash_table *htab;
5687
5688 htab = elf32_nios2_hash_table (info);
5689 dynobj = htab->root.dynobj;
5690 BFD_ASSERT (dynobj != NULL);
5691
5692 htab->res_n_size = 0;
5693 if (htab->root.dynamic_sections_created)
5694 {
5695 /* Set the contents of the .interp section to the interpreter. */
5696 if (bfd_link_executable (info) && !info->nointerp)
5697 {
5698 s = bfd_get_linker_section (dynobj, ".interp");
5699 BFD_ASSERT (s != NULL);
5700 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
5701 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
5702 }
5703 }
5704 else
5705 {
5706 /* We may have created entries in the .rela.got section.
5707 However, if we are not creating the dynamic sections, we will
5708 not actually use these entries. Reset the size of .rela.got,
5709 which will cause it to get stripped from the output file
5710 below. */
5711 s = htab->root.srelgot;
5712 if (s != NULL)
5713 s->size = 0;
5714 }
5715
5716 /* Set up .got offsets for local syms, and space for local dynamic
5717 relocs. */
5718 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5719 {
5720 bfd_signed_vma *local_got;
5721 bfd_signed_vma *end_local_got;
5722 char *local_tls_type;
5723 bfd_size_type locsymcount;
5724 Elf_Internal_Shdr *symtab_hdr;
5725 asection *srel;
5726
5727 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
5728 continue;
5729
5730 for (s = ibfd->sections; s != NULL; s = s->next)
5731 {
5732 struct elf_dyn_relocs *p;
5733
5734 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
5735 {
5736 if (!bfd_is_abs_section (p->sec)
5737 && bfd_is_abs_section (p->sec->output_section))
5738 {
5739 /* Input section has been discarded, either because
5740 it is a copy of a linkonce section or due to
5741 linker script /DISCARD/, so we'll be discarding
5742 the relocs too. */
5743 }
5744 else if (p->count != 0)
5745 {
5746 srel = elf_section_data (p->sec)->sreloc;
5747 srel->size += p->count * sizeof (Elf32_External_Rela);
5748 }
5749 }
5750 }
5751
5752 local_got = elf_local_got_refcounts (ibfd);
5753 if (!local_got)
5754 continue;
5755
5756 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
5757 locsymcount = symtab_hdr->sh_info;
5758 end_local_got = local_got + locsymcount;
5759 local_tls_type = elf32_nios2_local_got_tls_type (ibfd);
5760 s = htab->root.sgot;
5761 srel = htab->root.srelgot;
5762 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
5763 {
5764 if (*local_got > 0)
5765 {
5766 *local_got = s->size;
5767 if (*local_tls_type & GOT_TLS_GD)
5768 /* TLS_GD relocs need an 8-byte structure in the GOT. */
5769 s->size += 8;
5770 if (*local_tls_type & GOT_TLS_IE)
5771 s->size += 4;
5772 if (*local_tls_type == GOT_NORMAL)
5773 s->size += 4;
5774
5775 if (bfd_link_pic (info) || *local_tls_type == GOT_TLS_GD)
5776 srel->size += sizeof (Elf32_External_Rela);
5777 }
5778 else
5779 *local_got = (bfd_vma) -1;
5780 }
5781 }
5782
5783 if (htab->tls_ldm_got.refcount > 0)
5784 {
5785 /* Allocate two GOT entries and one dynamic relocation (if necessary)
5786 for R_NIOS2_TLS_LDM16 relocations. */
5787 htab->tls_ldm_got.offset = htab->root.sgot->size;
5788 htab->root.sgot->size += 8;
5789 if (bfd_link_pic (info))
5790 htab->root.srelgot->size += sizeof (Elf32_External_Rela);
5791 }
5792 else
5793 htab->tls_ldm_got.offset = -1;
5794
5795 /* Allocate global sym .plt and .got entries, and space for global
5796 sym dynamic relocs. */
5797 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info);
5798
5799 if (htab->root.dynamic_sections_created)
5800 {
5801 /* If the .got section is more than 0x8000 bytes, we add
5802 0x8000 to the value of _gp_got, so that 16-bit relocations
5803 have a greater chance of working. */
5804 if (htab->root.sgot->size >= 0x8000
5805 && htab->h_gp_got->root.u.def.value == 0)
5806 htab->h_gp_got->root.u.def.value = 0x8000;
5807 }
5808
5809 /* The check_relocs and adjust_dynamic_symbol entry points have
5810 determined the sizes of the various dynamic sections. Allocate
5811 memory for them. */
5812 relocs = false;
5813 for (s = dynobj->sections; s != NULL; s = s->next)
5814 {
5815 const char *name;
5816
5817 if ((s->flags & SEC_LINKER_CREATED) == 0)
5818 continue;
5819
5820 /* It's OK to base decisions on the section name, because none
5821 of the dynobj section names depend upon the input files. */
5822 name = bfd_section_name (s);
5823
5824 if (startswith (name, ".rela"))
5825 {
5826 if (s->size != 0)
5827 {
5828 if (s != htab->root.srelplt)
5829 relocs = true;
5830
5831 /* We use the reloc_count field as a counter if we need
5832 to copy relocs into the output file. */
5833 s->reloc_count = 0;
5834 }
5835 }
5836 else if (s == htab->root.splt)
5837 {
5838 /* Correct for the number of res_N branches. */
5839 if (s->size != 0 && !bfd_link_pic (info))
5840 {
5841 htab->res_n_size = (s->size - 28) / 3;
5842 s->size += htab->res_n_size;
5843 }
5844 }
5845 else if (s != htab->sbss
5846 && s != htab->root.sgot
5847 && s != htab->root.sgotplt
5848 && s != htab->root.sdynbss
5849 && s != htab->root.sdynrelro)
5850 /* It's not one of our sections, so don't allocate space. */
5851 continue;
5852
5853 if (s->size == 0)
5854 {
5855 s->flags |= SEC_EXCLUDE;
5856 continue;
5857 }
5858
5859 if ((s->flags & SEC_HAS_CONTENTS) == 0)
5860 continue;
5861
5862 /* Allocate memory for the section contents. */
5863 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
5864 if (s->contents == NULL)
5865 return false;
5866 }
5867
5868 /* Adjust dynamic symbols that point to the plt to account for the
5869 now-known number of resN slots. */
5870 if (htab->res_n_size)
5871 elf_link_hash_traverse (& htab->root, adjust_dynrelocs, info);
5872
5873 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
5874 }
5875
5876 /* Free the derived linker hash table. */
5877 static void
nios2_elf32_link_hash_table_free(bfd * obfd)5878 nios2_elf32_link_hash_table_free (bfd *obfd)
5879 {
5880 struct elf32_nios2_link_hash_table *htab
5881 = (struct elf32_nios2_link_hash_table *) obfd->link.hash;
5882
5883 bfd_hash_table_free (&htab->bstab);
5884 _bfd_elf_link_hash_table_free (obfd);
5885 }
5886
5887 /* Implement bfd_elf32_bfd_link_hash_table_create. */
5888 static struct bfd_link_hash_table *
nios2_elf32_link_hash_table_create(bfd * abfd)5889 nios2_elf32_link_hash_table_create (bfd *abfd)
5890 {
5891 struct elf32_nios2_link_hash_table *ret;
5892 size_t amt = sizeof (struct elf32_nios2_link_hash_table);
5893
5894 ret = bfd_zmalloc (amt);
5895 if (ret == NULL)
5896 return NULL;
5897
5898 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
5899 link_hash_newfunc,
5900 sizeof (struct
5901 elf32_nios2_link_hash_entry),
5902 NIOS2_ELF_DATA))
5903 {
5904 free (ret);
5905 return NULL;
5906 }
5907
5908 /* Init the stub hash table too. */
5909 if (!bfd_hash_table_init (&ret->bstab, stub_hash_newfunc,
5910 sizeof (struct elf32_nios2_stub_hash_entry)))
5911 {
5912 _bfd_elf_link_hash_table_free (abfd);
5913 return NULL;
5914 }
5915 ret->root.root.hash_table_free = nios2_elf32_link_hash_table_free;
5916
5917 return &ret->root.root;
5918 }
5919
5920 /* Implement elf_backend_reloc_type_class. */
5921 static enum elf_reloc_type_class
nios2_elf32_reloc_type_class(const struct bfd_link_info * info ATTRIBUTE_UNUSED,const asection * rel_sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * rela)5922 nios2_elf32_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
5923 const asection *rel_sec ATTRIBUTE_UNUSED,
5924 const Elf_Internal_Rela *rela)
5925 {
5926 switch ((int) ELF32_R_TYPE (rela->r_info))
5927 {
5928 case R_NIOS2_RELATIVE:
5929 return reloc_class_relative;
5930 case R_NIOS2_JUMP_SLOT:
5931 return reloc_class_plt;
5932 case R_NIOS2_COPY:
5933 return reloc_class_copy;
5934 default:
5935 return reloc_class_normal;
5936 }
5937 }
5938
5939 /* Return 1 if target is one of ours. */
5940 static bool
is_nios2_elf_target(const struct bfd_target * targ)5941 is_nios2_elf_target (const struct bfd_target *targ)
5942 {
5943 return (targ == &nios2_elf32_le_vec
5944 || targ == &nios2_elf32_be_vec);
5945 }
5946
5947 /* Implement elf_backend_add_symbol_hook.
5948 This hook is called by the linker when adding symbols from an object
5949 file. We use it to put .comm items in .sbss, and not .bss. */
5950 static bool
nios2_elf_add_symbol_hook(bfd * abfd,struct bfd_link_info * info,Elf_Internal_Sym * sym,const char ** namep ATTRIBUTE_UNUSED,flagword * flagsp ATTRIBUTE_UNUSED,asection ** secp,bfd_vma * valp)5951 nios2_elf_add_symbol_hook (bfd *abfd,
5952 struct bfd_link_info *info,
5953 Elf_Internal_Sym *sym,
5954 const char **namep ATTRIBUTE_UNUSED,
5955 flagword *flagsp ATTRIBUTE_UNUSED,
5956 asection **secp,
5957 bfd_vma *valp)
5958 {
5959 if (sym->st_shndx == SHN_COMMON
5960 && !bfd_link_relocatable (info)
5961 && sym->st_size <= elf_gp_size (abfd)
5962 && is_nios2_elf_target (info->output_bfd->xvec))
5963 {
5964 /* Common symbols less than or equal to -G nn bytes are automatically
5965 put into .sbss. */
5966 struct elf32_nios2_link_hash_table *htab;
5967
5968 htab = elf32_nios2_hash_table (info);
5969 if (htab->sbss == NULL)
5970 {
5971 flagword flags = SEC_IS_COMMON | SEC_SMALL_DATA | SEC_LINKER_CREATED;
5972
5973 if (htab->root.dynobj == NULL)
5974 htab->root.dynobj = abfd;
5975
5976 htab->sbss = bfd_make_section_anyway_with_flags (htab->root.dynobj,
5977 ".sbss", flags);
5978 if (htab->sbss == NULL)
5979 return false;
5980 }
5981
5982 *secp = htab->sbss;
5983 *valp = sym->st_size;
5984 }
5985
5986 return true;
5987 }
5988
5989 /* Implement elf_backend_can_make_relative_eh_frame:
5990 Decide whether to attempt to turn absptr or lsda encodings in
5991 shared libraries into pcrel within the given input section. */
5992 static bool
nios2_elf32_can_make_relative_eh_frame(bfd * input_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info ATTRIBUTE_UNUSED,asection * eh_frame_section ATTRIBUTE_UNUSED)5993 nios2_elf32_can_make_relative_eh_frame (bfd *input_bfd ATTRIBUTE_UNUSED,
5994 struct bfd_link_info *info
5995 ATTRIBUTE_UNUSED,
5996 asection *eh_frame_section
5997 ATTRIBUTE_UNUSED)
5998 {
5999 /* We can't use PC-relative encodings in the .eh_frame section. */
6000 return false;
6001 }
6002
6003 /* Implement elf_backend_special_sections. */
6004 const struct bfd_elf_special_section elf32_nios2_special_sections[] =
6005 {
6006 { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS,
6007 SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL },
6008 { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS,
6009 SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL },
6010 { NULL, 0, 0, 0, 0 }
6011 };
6012
6013 #define ELF_ARCH bfd_arch_nios2
6014 #define ELF_TARGET_ID NIOS2_ELF_DATA
6015 #define ELF_MACHINE_CODE EM_ALTERA_NIOS2
6016
6017 /* The Nios II MMU uses a 4K page size. */
6018
6019 #define ELF_MAXPAGESIZE 0x1000
6020
6021 #define bfd_elf32_bfd_link_hash_table_create \
6022 nios2_elf32_link_hash_table_create
6023
6024 #define bfd_elf32_bfd_merge_private_bfd_data \
6025 nios2_elf32_merge_private_bfd_data
6026
6027 /* Relocation table lookup macros. */
6028
6029 #define bfd_elf32_bfd_reloc_type_lookup nios2_elf32_bfd_reloc_type_lookup
6030 #define bfd_elf32_bfd_reloc_name_lookup nios2_elf32_bfd_reloc_name_lookup
6031
6032 /* JUMP_TABLE_LINK macros. */
6033
6034 /* elf_info_to_howto (using RELA relocations). */
6035
6036 #define elf_info_to_howto nios2_elf32_info_to_howto
6037
6038 /* elf backend functions. */
6039
6040 #define elf_backend_can_gc_sections 1
6041 #define elf_backend_can_refcount 1
6042 #define elf_backend_plt_readonly 1
6043 #define elf_backend_want_got_plt 1
6044 #define elf_backend_want_dynrelro 1
6045 #define elf_backend_rela_normal 1
6046 #define elf_backend_dtrel_excludes_plt 1
6047
6048 #define elf_backend_relocate_section nios2_elf32_relocate_section
6049 #define elf_backend_section_flags nios2_elf32_section_flags
6050 #define elf_backend_fake_sections nios2_elf32_fake_sections
6051 #define elf_backend_check_relocs nios2_elf32_check_relocs
6052
6053 #define elf_backend_gc_mark_hook nios2_elf32_gc_mark_hook
6054 #define elf_backend_create_dynamic_sections \
6055 nios2_elf32_create_dynamic_sections
6056 #define elf_backend_finish_dynamic_symbol nios2_elf32_finish_dynamic_symbol
6057 #define elf_backend_finish_dynamic_sections \
6058 nios2_elf32_finish_dynamic_sections
6059 #define elf_backend_adjust_dynamic_symbol nios2_elf32_adjust_dynamic_symbol
6060 #define elf_backend_reloc_type_class nios2_elf32_reloc_type_class
6061 #define elf_backend_size_dynamic_sections nios2_elf32_size_dynamic_sections
6062 #define elf_backend_add_symbol_hook nios2_elf_add_symbol_hook
6063 #define elf_backend_copy_indirect_symbol nios2_elf32_copy_indirect_symbol
6064 #define elf_backend_object_p nios2_elf32_object_p
6065
6066 #define elf_backend_grok_prstatus nios2_grok_prstatus
6067 #define elf_backend_grok_psinfo nios2_grok_psinfo
6068
6069 #undef elf_backend_can_make_relative_eh_frame
6070 #define elf_backend_can_make_relative_eh_frame \
6071 nios2_elf32_can_make_relative_eh_frame
6072
6073 #define elf_backend_special_sections elf32_nios2_special_sections
6074
6075 #define TARGET_LITTLE_SYM nios2_elf32_le_vec
6076 #define TARGET_LITTLE_NAME "elf32-littlenios2"
6077 #define TARGET_BIG_SYM nios2_elf32_be_vec
6078 #define TARGET_BIG_NAME "elf32-bignios2"
6079
6080 #define elf_backend_got_header_size 12
6081 #define elf_backend_default_execstack 0
6082
6083 #include "elf32-target.h"
6084