1 /* Meta support for 32-bit ELF
2 Copyright (C) 2013-2021 Free Software Foundation, Inc.
3 Contributed by Imagination Technologies Ltd.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf32-metag.h"
27 #include "elf/metag.h"
28
29 #define GOT_ENTRY_SIZE 4
30 #define ELF_DYNAMIC_INTERPRETER "/lib/ld-uClibc.so.0"
31
32 /* ABI version:
33 0 - original
34 1 - with GOT offset */
35 #define METAG_ELF_ABI_VERSION 1
36
37 static const unsigned int plt0_entry[] =
38 {
39 0x02000005, /* MOVT D0Re0, #HI(GOT+4) */
40 0x02000000, /* ADD D0Re0, D0Re0, #LO(GOT+4) */
41 0xb70001e3, /* SETL [A0StP++], D0Re0, D1Re0 */
42 0xc600012a, /* GETD PC, [D0Re0+#4] */
43 0xa0fffffe /* NOP */
44 };
45
46 static const unsigned int plt0_pic_entry[] =
47 {
48 0x82900001, /* ADDT A0.2, CPC0, #0 */
49 0x82100000, /* ADD A0.2, A0.2, #0 */
50 0xa3100c20, /* MOV D0Re0, A0.2 */
51 0xb70001e3, /* SETL [A0StP++], D0Re0, D1Re0 */
52 0xc600012a, /* GETD PC, [D0Re0+#4] */
53 };
54
55 static const unsigned int plt_entry[] =
56 {
57 0x82100005, /* MOVT A0.2, #HI(GOT+off) */
58 0x82100000, /* ADD A0.2, A0.2, #LO(GOT+off) */
59 0xc600806a, /* GETD PC, [A0.2] */
60 0x03000004, /* MOV D1Re0, #LO(offset) */
61 0xa0000000 /* B PLT0 */
62 };
63
64 static const unsigned int plt_pic_entry[] =
65 {
66 0x82900001, /* ADDT A0.2, CPC0, #HI(GOT+off) */
67 0x82100000, /* ADD A0.2, A0.2, #LO(GOT+off) */
68 0xc600806a, /* GETD PC, [A0.2] */
69 0x03000004, /* MOV D1Re0, #LO(offset) */
70 0xa0000000 /* B PLT0 */
71 };
72
73 /* Variable names follow a coding style.
74 Please follow this (Apps Hungarian) style:
75
76 Structure/Variable Prefix
77 elf_link_hash_table "etab"
78 elf_link_hash_entry "eh"
79
80 elf_metag_link_hash_table "htab"
81 elf_metag_link_hash_entry "hh"
82
83 bfd_link_hash_table "btab"
84 bfd_link_hash_entry "bh"
85
86 bfd_hash_table containing stubs "bstab"
87 elf_metag_stub_hash_entry "hsh"
88
89 Always remember to use GNU Coding Style. */
90
91 #define PLT_ENTRY_SIZE sizeof(plt_entry)
92
93 static reloc_howto_type elf_metag_howto_table[] =
94 {
95 /* High order 16 bit absolute. */
96 HOWTO (R_METAG_HIADDR16, /* type */
97 16, /* rightshift */
98 2, /* size (0 = byte, 1 = short, 2 = long) */
99 16, /* bitsize */
100 false, /* pc_relative */
101 3, /* bitpos */
102 complain_overflow_dont, /* complain_on_overflow */
103 bfd_elf_generic_reloc, /* special_function */
104 "R_METAG_HIADDR16", /* name */
105 false, /* partial_inplace */
106 0, /* src_mask */
107 0x0007fff8, /* dst_mask */
108 false), /* pcrel_offset */
109
110 /* Low order 16 bit absolute. */
111 HOWTO (R_METAG_LOADDR16, /* type */
112 0, /* rightshift */
113 2, /* size (0 = byte, 1 = short, 2 = long) */
114 16, /* bitsize */
115 false, /* pc_relative */
116 3, /* bitpos */
117 complain_overflow_dont,/* complain_on_overflow */
118 bfd_elf_generic_reloc, /* special_function */
119 "R_METAG_LOADDR16", /* name */
120 false, /* partial_inplace */
121 0, /* src_mask */
122 0x0007fff8, /* dst_mask */
123 false), /* pcrel_offset */
124
125 /* 32 bit absolute. */
126 HOWTO (R_METAG_ADDR32, /* type */
127 0, /* rightshift */
128 2, /* size (0 = byte, 1 = short, 2 = long) */
129 32, /* bitsize */
130 false, /* pc_relative */
131 0, /* bitpos */
132 complain_overflow_bitfield, /* complain_on_overflow */
133 bfd_elf_generic_reloc, /* special_function */
134 "R_METAG_ADDR32", /* name */
135 false, /* partial_inplace */
136 0x00000000, /* src_mask */
137 0xffffffff, /* dst_mask */
138 false), /* pcrel_offset */
139
140 /* No relocation. */
141 HOWTO (R_METAG_NONE, /* type */
142 0, /* rightshift */
143 3, /* size (0 = byte, 1 = short, 2 = long) */
144 0, /* bitsize */
145 false, /* pc_relative */
146 0, /* bitpos */
147 complain_overflow_dont, /* complain_on_overflow */
148 bfd_elf_generic_reloc, /* special_function */
149 "R_METAG_NONE", /* name */
150 false, /* partial_inplace */
151 0, /* src_mask */
152 0, /* dst_mask */
153 false), /* pcrel_offset */
154
155 /* 19 bit pc relative */
156 HOWTO (R_METAG_RELBRANCH, /* type */
157 2, /* rightshift */
158 2, /* size (0 = byte, 1 = short, 2 = long) */
159 19, /* bitsize */
160 true, /* pc_relative */
161 5, /* bitpos */
162 complain_overflow_signed, /* complain_on_overflow */
163 bfd_elf_generic_reloc, /* special_function */
164 "R_METAG_RELBRANCH", /* name */
165 false, /* partial_inplace */
166 0, /* src_mask */
167 0x00ffffe0, /* dst_mask */
168 false), /* pcrel_offset */
169
170 /* GET/SET offset */
171 HOWTO (R_METAG_GETSETOFF, /* type */
172 0, /* rightshift */
173 1, /* size (0 = byte, 1 = short, 2 = long) */
174 12, /* bitsize */
175 false, /* pc_relative */
176 7, /* bitpos */
177 complain_overflow_dont, /* complain_on_overflow */
178 bfd_elf_generic_reloc, /* special_function */
179 "R_METAG_GETSETOFF", /* name */
180 false, /* partial_inplace */
181 0, /* src_mask */
182 0, /* dst_mask */
183 false), /* pcrel_offset */
184
185 EMPTY_HOWTO (6),
186 EMPTY_HOWTO (7),
187 EMPTY_HOWTO (8),
188 EMPTY_HOWTO (9),
189 EMPTY_HOWTO (10),
190 EMPTY_HOWTO (11),
191 EMPTY_HOWTO (12),
192 EMPTY_HOWTO (13),
193 EMPTY_HOWTO (14),
194 EMPTY_HOWTO (15),
195 EMPTY_HOWTO (16),
196 EMPTY_HOWTO (17),
197 EMPTY_HOWTO (18),
198 EMPTY_HOWTO (19),
199 EMPTY_HOWTO (20),
200 EMPTY_HOWTO (21),
201 EMPTY_HOWTO (22),
202 EMPTY_HOWTO (23),
203 EMPTY_HOWTO (24),
204 EMPTY_HOWTO (25),
205 EMPTY_HOWTO (26),
206 EMPTY_HOWTO (27),
207 EMPTY_HOWTO (28),
208 EMPTY_HOWTO (29),
209
210 HOWTO (R_METAG_GNU_VTINHERIT, /* type */
211 0, /* rightshift */
212 2, /* size (0 = byte, 1 = short, 2 = long) */
213 0, /* bitsize */
214 false, /* pc_relative */
215 0, /* bitpos */
216 complain_overflow_dont, /* complain_on_overflow */
217 NULL, /* special_function */
218 "R_METAG_GNU_VTINHERIT", /* name */
219 false, /* partial_inplace */
220 0, /* src_mask */
221 0, /* dst_mask */
222 false), /* pcrel_offset */
223
224 HOWTO (R_METAG_GNU_VTENTRY, /* type */
225 0, /* rightshift */
226 2, /* size (0 = byte, 1 = short, 2 = long) */
227 0, /* bitsize */
228 false, /* pc_relative */
229 0, /* bitpos */
230 complain_overflow_dont, /* complain_on_overflow */
231 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
232 "R_METAG_GNU_VTENTRY", /* name */
233 false, /* partial_inplace */
234 0, /* src_mask */
235 0, /* dst_mask */
236 false), /* pcrel_offset */
237
238 /* High order 16 bit GOT offset */
239 HOWTO (R_METAG_HI16_GOTOFF, /* type */
240 16, /* rightshift */
241 2, /* size (0 = byte, 1 = short, 2 = long) */
242 16, /* bitsize */
243 false, /* pc_relative */
244 3, /* bitpos */
245 complain_overflow_dont, /* complain_on_overflow */
246 bfd_elf_generic_reloc, /* special_function */
247 "R_METAG_HI16_GOTOFF", /* name */
248 false, /* partial_inplace */
249 0, /* src_mask */
250 0x0007fff8, /* dst_mask */
251 false), /* pcrel_offset */
252
253 /* Low order 16 bit GOT offset */
254 HOWTO (R_METAG_LO16_GOTOFF, /* type */
255 0, /* rightshift */
256 2, /* size (0 = byte, 1 = short, 2 = long) */
257 16, /* bitsize */
258 false, /* pc_relative */
259 3, /* bitpos */
260 complain_overflow_dont, /* complain_on_overflow */
261 bfd_elf_generic_reloc, /* special_function */
262 "R_METAG_LO16_GOTOFF", /* name */
263 false, /* partial_inplace */
264 0, /* src_mask */
265 0x0007fff8, /* dst_mask */
266 false), /* pcrel_offset */
267
268 /* GET/SET GOT offset */
269 HOWTO (R_METAG_GETSET_GOTOFF, /* type */
270 0, /* rightshift */
271 1, /* size (0 = byte, 1 = short, 2 = long) */
272 12, /* bitsize */
273 false, /* pc_relative */
274 7, /* bitpos */
275 complain_overflow_dont, /* complain_on_overflow */
276 bfd_elf_generic_reloc, /* special_function */
277 "R_METAG_GETSET_GOTOFF", /* name */
278 false, /* partial_inplace */
279 0, /* src_mask */
280 0, /* dst_mask */
281 false), /* pcrel_offset */
282
283 /* GET/SET GOT relative */
284 HOWTO (R_METAG_GETSET_GOT, /* type */
285 0, /* rightshift */
286 1, /* size (0 = byte, 1 = short, 2 = long) */
287 12, /* bitsize */
288 false, /* pc_relative */
289 7, /* bitpos */
290 complain_overflow_dont, /* complain_on_overflow */
291 bfd_elf_generic_reloc, /* special_function */
292 "R_METAG_GETSET_GOT", /* name */
293 false, /* partial_inplace */
294 0, /* src_mask */
295 0, /* dst_mask */
296 false), /* pcrel_offset */
297
298 /* High order 16 bit GOT reference */
299 HOWTO (R_METAG_HI16_GOTPC, /* type */
300 16, /* rightshift */
301 2, /* size (0 = byte, 1 = short, 2 = long) */
302 16, /* bitsize */
303 false, /* pc_relative */
304 3, /* bitpos */
305 complain_overflow_dont, /* complain_on_overflow */
306 bfd_elf_generic_reloc, /* special_function */
307 "R_METAG_HI16_GOTPC", /* name */
308 false, /* partial_inplace */
309 0, /* src_mask */
310 0x0007fff8, /* dst_mask */
311 false), /* pcrel_offset */
312
313 /* Low order 16 bit GOT reference */
314 HOWTO (R_METAG_LO16_GOTPC, /* type */
315 0, /* rightshift */
316 2, /* size (0 = byte, 1 = short, 2 = long) */
317 16, /* bitsize */
318 false, /* pc_relative */
319 3, /* bitpos */
320 complain_overflow_dont, /* complain_on_overflow */
321 bfd_elf_generic_reloc, /* special_function */
322 "R_METAG_LO16_GOTPC", /* name */
323 false, /* partial_inplace */
324 0, /* src_mask */
325 0x0007fff8, /* dst_mask */
326 false), /* pcrel_offset */
327
328 /* High order 16 bit PLT */
329 HOWTO (R_METAG_HI16_PLT, /* type */
330 16, /* rightshift */
331 2, /* size (0 = byte, 1 = short, 2 = long) */
332 16, /* bitsize */
333 false, /* pc_relative */
334 3, /* bitpos */
335 complain_overflow_dont, /* complain_on_overflow */
336 bfd_elf_generic_reloc, /* special_function */
337 "R_METAG_HI16_PLT", /* name */
338 false, /* partial_inplace */
339 0, /* src_mask */
340 0x0007fff8, /* dst_mask */
341 false), /* pcrel_offset */
342
343 /* Low order 16 bit PLT */
344 HOWTO (R_METAG_LO16_PLT, /* type */
345 0, /* rightshift */
346 2, /* size (0 = byte, 1 = short, 2 = long) */
347 16, /* bitsize */
348 false, /* pc_relative */
349 3, /* bitpos */
350 complain_overflow_dont, /* complain_on_overflow */
351 bfd_elf_generic_reloc, /* special_function */
352 "R_METAG_LO16_PLT", /* name */
353 false, /* partial_inplace */
354 0, /* src_mask */
355 0xffffffff, /* dst_mask */
356 false), /* pcrel_offset */
357
358 HOWTO (R_METAG_RELBRANCH_PLT, /* type */
359 2, /* rightshift */
360 2, /* size (0 = byte, 1 = short, 2 = long) */
361 19, /* bitsize */
362 true, /* pc_relative */
363 5, /* bitpos */
364 complain_overflow_signed, /* complain_on_overflow */
365 bfd_elf_generic_reloc, /* special_function */
366 "R_METAG_RELBRANCH_PLT", /* name */
367 false, /* partial_inplace */
368 0, /* src_mask */
369 0x00ffffe0, /* dst_mask */
370 false), /* pcrel_offset */
371
372 /* Dummy relocs used by the linker internally. */
373 HOWTO (R_METAG_GOTOFF, /* type */
374 0, /* rightshift */
375 2, /* size (0 = byte, 1 = short, 2 = long) */
376 32, /* bitsize */
377 false, /* pc_relative */
378 0, /* bitpos */
379 complain_overflow_bitfield, /* complain_on_overflow */
380 bfd_elf_generic_reloc, /* special_function */
381 "R_METAG_GOTOFF", /* name */
382 false, /* partial_inplace */
383 0xffffffff, /* src_mask */
384 0xffffffff, /* dst_mask */
385 false), /* pcrel_offset */
386
387 HOWTO (R_METAG_PLT, /* type */
388 0, /* rightshift */
389 2, /* size (0 = byte, 1 = short, 2 = long) */
390 32, /* bitsize */
391 false, /* pc_relative */
392 0, /* bitpos */
393 complain_overflow_bitfield, /* complain_on_overflow */
394 bfd_elf_generic_reloc, /* special_function */
395 "R_METAG_GOTOFF", /* name */
396 false, /* partial_inplace */
397 0xffffffff, /* src_mask */
398 0xffffffff, /* dst_mask */
399 false), /* pcrel_offset */
400
401 /* This is used only by the dynamic linker. The symbol should exist
402 both in the object being run and in some shared library. The
403 dynamic linker copies the data addressed by the symbol from the
404 shared library into the object, because the object being
405 run has to have the data at some particular address. */
406 HOWTO (R_METAG_COPY, /* type */
407 0, /* rightshift */
408 2, /* size (0 = byte, 1 = short, 2 = long) */
409 32, /* bitsize */
410 false, /* pc_relative */
411 0, /* bitpos */
412 complain_overflow_bitfield, /* complain_on_overflow */
413 bfd_elf_generic_reloc, /* special_function */
414 "R_METAG_COPY", /* name */
415 false, /* partial_inplace */
416 0xffffffff, /* src_mask */
417 0xffffffff, /* dst_mask */
418 false), /* pcrel_offset */
419
420 /* Marks a procedure linkage table entry for a symbol. */
421 HOWTO (R_METAG_JMP_SLOT, /* type */
422 0, /* rightshift */
423 2, /* size (0 = byte, 1 = short, 2 = long) */
424 32, /* bitsize */
425 false, /* pc_relative */
426 0, /* bitpos */
427 complain_overflow_bitfield, /* complain_on_overflow */
428 bfd_elf_generic_reloc, /* special_function */
429 "R_METAG_JMP_SLOT", /* name */
430 false, /* partial_inplace */
431 0xffffffff, /* src_mask */
432 0xffffffff, /* dst_mask */
433 false), /* pcrel_offset */
434
435 /* Used only by the dynamic linker. When the object is run, this
436 longword is set to the load address of the object, plus the
437 addend. */
438 HOWTO (R_METAG_RELATIVE, /* type */
439 0, /* rightshift */
440 2, /* size (0 = byte, 1 = short, 2 = long) */
441 32, /* bitsize */
442 false, /* pc_relative */
443 0, /* bitpos */
444 complain_overflow_bitfield, /* complain_on_overflow */
445 bfd_elf_generic_reloc, /* special_function */
446 "R_METAG_RELATIVE", /* name */
447 false, /* partial_inplace */
448 0xffffffff, /* src_mask */
449 0xffffffff, /* dst_mask */
450 false), /* pcrel_offset */
451
452 HOWTO (R_METAG_GLOB_DAT, /* type */
453 0, /* rightshift */
454 2, /* size (0 = byte, 1 = short, 2 = long) */
455 32, /* bitsize */
456 false, /* pc_relative */
457 0, /* bitpos */
458 complain_overflow_bitfield, /* complain_on_overflow */
459 bfd_elf_generic_reloc, /* special_function */
460 "R_METAG_GLOB_DAT", /* name */
461 false, /* partial_inplace */
462 0xffffffff, /* src_mask */
463 0xffffffff, /* dst_mask */
464 false), /* pcrel_offset */
465
466 HOWTO (R_METAG_TLS_GD, /* type */
467 0, /* rightshift */
468 2, /* size (0 = byte, 1 = short, 2 = long) */
469 16, /* bitsize */
470 false, /* pc_relative */
471 3, /* bitpos */
472 complain_overflow_dont, /* complain_on_overflow */
473 bfd_elf_generic_reloc, /* special_function */
474 "R_METAG_TLS_GD", /* name */
475 false, /* partial_inplace */
476 0, /* src_mask */
477 0x0007fff8, /* dst_mask */
478 false), /* pcrel_offset */
479
480 HOWTO (R_METAG_TLS_LDM, /* type */
481 0, /* rightshift */
482 2, /* size (0 = byte, 1 = short, 2 = long) */
483 16, /* bitsize */
484 false, /* pc_relative */
485 3, /* bitpos */
486 complain_overflow_bitfield, /* complain_on_overflow */
487 bfd_elf_generic_reloc, /* special_function */
488 "R_METAG_TLS_LDM", /* name */
489 false, /* partial_inplace */
490 0, /* src_mask */
491 0x0007fff8, /* dst_mask */
492 false), /* pcrel_offset */
493
494 HOWTO (R_METAG_TLS_LDO_HI16, /* type */
495 16, /* rightshift */
496 2, /* size (0 = byte, 1 = short, 2 = long) */
497 16, /* bitsize */
498 false, /* pc_relative */
499 3, /* bitpos */
500 complain_overflow_bitfield, /* complain_on_overflow */
501 bfd_elf_generic_reloc, /* special_function */
502 "R_METAG_TLS_LDO_HI16", /* name */
503 false, /* partial_inplace */
504 0, /* src_mask */
505 0x0007fff8, /* dst_mask */
506 false), /* pcrel_offset */
507
508 HOWTO (R_METAG_TLS_LDO_LO16, /* type */
509 0, /* rightshift */
510 2, /* size (0 = byte, 1 = short, 2 = long) */
511 16, /* bitsize */
512 false, /* pc_relative */
513 3, /* bitpos */
514 complain_overflow_bitfield, /* complain_on_overflow */
515 bfd_elf_generic_reloc, /* special_function */
516 "R_METAG_TLS_LDO_LO16", /* name */
517 false, /* partial_inplace */
518 0, /* src_mask */
519 0x0007fff8, /* dst_mask */
520 false), /* pcrel_offset */
521
522 /* Dummy reloc used by the linker internally. */
523 HOWTO (R_METAG_TLS_LDO, /* type */
524 0, /* rightshift */
525 2, /* size (0 = byte, 1 = short, 2 = long) */
526 16, /* bitsize */
527 false, /* pc_relative */
528 3, /* bitpos */
529 complain_overflow_bitfield, /* complain_on_overflow */
530 bfd_elf_generic_reloc, /* special_function */
531 "R_METAG_TLS_LDO", /* name */
532 false, /* partial_inplace */
533 0, /* src_mask */
534 0x0007fff8, /* dst_mask */
535 false), /* pcrel_offset */
536
537 HOWTO (R_METAG_TLS_IE, /* type */
538 2, /* rightshift */
539 2, /* size (0 = byte, 1 = short, 2 = long) */
540 12, /* bitsize */
541 false, /* pc_relative */
542 7, /* bitpos */
543 complain_overflow_dont, /* complain_on_overflow */
544 bfd_elf_generic_reloc, /* special_function */
545 "R_METAG_TLS_IE", /* name */
546 false, /* partial_inplace */
547 0, /* src_mask */
548 0x0007ff80, /* dst_mask */
549 false), /* pcrel_offset */
550
551 /* Dummy reloc used by the linker internally. */
552 HOWTO (R_METAG_TLS_IENONPIC, /* type */
553 0, /* rightshift */
554 2, /* size (0 = byte, 1 = short, 2 = long) */
555 16, /* bitsize */
556 false, /* pc_relative */
557 3, /* bitpos */
558 complain_overflow_dont, /* complain_on_overflow */
559 bfd_elf_generic_reloc, /* special_function */
560 "R_METAG_TLS_IENONPIC", /* name */
561 false, /* partial_inplace */
562 0, /* src_mask */
563 0x0007fff8, /* dst_mask */
564 false), /* pcrel_offset */
565
566 HOWTO (R_METAG_TLS_IENONPIC_HI16,/* type */
567 16, /* rightshift */
568 2, /* size (0 = byte, 1 = short, 2 = long) */
569 16, /* bitsize */
570 false, /* pc_relative */
571 3, /* bitpos */
572 complain_overflow_dont, /* complain_on_overflow */
573 bfd_elf_generic_reloc, /* special_function */
574 "R_METAG_TLS_IENONPIC_HI16", /* name */
575 false, /* partial_inplace */
576 0, /* src_mask */
577 0x0007fff8, /* dst_mask */
578 false), /* pcrel_offset */
579
580 HOWTO (R_METAG_TLS_IENONPIC_LO16,/* type */
581 0, /* rightshift */
582 2, /* size (0 = byte, 1 = short, 2 = long) */
583 16, /* bitsize */
584 false, /* pc_relative */
585 3, /* bitpos */
586 complain_overflow_dont, /* complain_on_overflow */
587 bfd_elf_generic_reloc, /* special_function */
588 "R_METAG_TLS_IENONPIC_LO16", /* name */
589 false, /* partial_inplace */
590 0, /* src_mask */
591 0x0007fff8, /* dst_mask */
592 false), /* pcrel_offset */
593
594 HOWTO (R_METAG_TLS_TPOFF, /* type */
595 0, /* rightshift */
596 2, /* size (0 = byte, 1 = short, 2 = long) */
597 32, /* bitsize */
598 false, /* pc_relative */
599 0, /* bitpos */
600 complain_overflow_bitfield, /* complain_on_overflow */
601 bfd_elf_generic_reloc, /* special_function */
602 "R_METAG_TLS_TPOFF", /* name */
603 false, /* partial_inplace */
604 0, /* src_mask */
605 0xffffffff, /* dst_mask */
606 false), /* pcrel_offset */
607
608 HOWTO (R_METAG_TLS_DTPMOD, /* type */
609 0, /* rightshift */
610 2, /* size (0 = byte, 1 = short, 2 = long) */
611 32, /* bitsize */
612 false, /* pc_relative */
613 0, /* bitpos */
614 complain_overflow_bitfield, /* complain_on_overflow */
615 bfd_elf_generic_reloc, /* special_function */
616 "R_METAG_TLS_DTPMOD", /* name */
617 false, /* partial_inplace */
618 0, /* src_mask */
619 0xffffffff, /* dst_mask */
620 false), /* pcrel_offset */
621
622 HOWTO (R_METAG_TLS_DTPOFF, /* type */
623 0, /* rightshift */
624 2, /* size (0 = byte, 1 = short, 2 = long) */
625 32, /* bitsize */
626 false, /* pc_relative */
627 0, /* bitpos */
628 complain_overflow_bitfield, /* complain_on_overflow */
629 bfd_elf_generic_reloc, /* special_function */
630 "R_METAG_TLS_DTPOFF", /* name */
631 false, /* partial_inplace */
632 0, /* src_mask */
633 0xffffffff, /* dst_mask */
634 false), /* pcrel_offset */
635
636 /* Dummy reloc used by the linker internally. */
637 HOWTO (R_METAG_TLS_LE, /* type */
638 0, /* rightshift */
639 2, /* size (0 = byte, 1 = short, 2 = long) */
640 32, /* bitsize */
641 false, /* pc_relative */
642 0, /* bitpos */
643 complain_overflow_bitfield, /* complain_on_overflow */
644 bfd_elf_generic_reloc, /* special_function */
645 "R_METAG_TLS_LE", /* name */
646 false, /* partial_inplace */
647 0, /* src_mask */
648 0xffffffff, /* dst_mask */
649 false), /* pcrel_offset */
650
651 HOWTO (R_METAG_TLS_LE_HI16, /* type */
652 16, /* rightshift */
653 2, /* size (0 = byte, 1 = short, 2 = long) */
654 16, /* bitsize */
655 false, /* pc_relative */
656 3, /* bitpos */
657 complain_overflow_dont, /* complain_on_overflow */
658 bfd_elf_generic_reloc, /* special_function */
659 "R_METAG_TLS_LE_HI16", /* name */
660 false, /* partial_inplace */
661 0, /* src_mask */
662 0x0007fff8, /* dst_mask */
663 false), /* pcrel_offset */
664
665 HOWTO (R_METAG_TLS_LE_LO16, /* type */
666 0, /* rightshift */
667 2, /* size (0 = byte, 1 = short, 2 = long) */
668 16, /* bitsize */
669 false, /* pc_relative */
670 3, /* bitpos */
671 complain_overflow_dont, /* complain_on_overflow */
672 bfd_elf_generic_reloc, /* special_function */
673 "R_METAG_TLS_LE_LO16", /* name */
674 false, /* partial_inplace */
675 0, /* src_mask */
676 0x0007fff8, /* dst_mask */
677 false), /* pcrel_offset */
678
679 };
680
681 #define BRANCH_BITS 19
682
683 /* The GOT is typically accessed using a [GS]ETD instruction. The size of the
684 immediate offset which can be used in such instructions therefore limits
685 the usable size of the GOT. If the base register for the [GS]ETD (A1LbP)
686 is pointing to the base of the GOT then the size is limited to the maximum
687 11 bits unsigned dword offset, or 2^13 = 0x2000 bytes. However the offset
688 in a [GS]ETD instruction is signed, so by setting the base address register
689 to an offset of that 0x2000 byte maximum unsigned offset from the base of
690 the GOT we can use negative offsets in addition to positive. This
691 effectively doubles the usable GOT size to 0x4000 bytes. */
692 #define GOT_REG_OFFSET 0x2000
693
694 struct metag_reloc_map
695 {
696 bfd_reloc_code_real_type bfd_reloc_val;
697 unsigned int metag_reloc_val;
698 };
699
700 static const struct metag_reloc_map metag_reloc_map [] =
701 {
702 { BFD_RELOC_NONE, R_METAG_NONE },
703 { BFD_RELOC_32, R_METAG_ADDR32 },
704 { BFD_RELOC_METAG_HIADDR16, R_METAG_HIADDR16 },
705 { BFD_RELOC_METAG_LOADDR16, R_METAG_LOADDR16 },
706 { BFD_RELOC_METAG_RELBRANCH, R_METAG_RELBRANCH },
707 { BFD_RELOC_METAG_GETSETOFF, R_METAG_GETSETOFF },
708 { BFD_RELOC_VTABLE_INHERIT, R_METAG_GNU_VTINHERIT },
709 { BFD_RELOC_VTABLE_ENTRY, R_METAG_GNU_VTENTRY },
710 { BFD_RELOC_METAG_REL8, R_METAG_REL8 },
711 { BFD_RELOC_METAG_REL16, R_METAG_REL16 },
712 { BFD_RELOC_METAG_HI16_GOTOFF, R_METAG_HI16_GOTOFF },
713 { BFD_RELOC_METAG_LO16_GOTOFF, R_METAG_LO16_GOTOFF },
714 { BFD_RELOC_METAG_GETSET_GOTOFF, R_METAG_GETSET_GOTOFF },
715 { BFD_RELOC_METAG_GETSET_GOT, R_METAG_GETSET_GOT },
716 { BFD_RELOC_METAG_HI16_GOTPC, R_METAG_HI16_GOTPC },
717 { BFD_RELOC_METAG_LO16_GOTPC, R_METAG_LO16_GOTPC },
718 { BFD_RELOC_METAG_HI16_PLT, R_METAG_HI16_PLT },
719 { BFD_RELOC_METAG_LO16_PLT, R_METAG_LO16_PLT },
720 { BFD_RELOC_METAG_RELBRANCH_PLT, R_METAG_RELBRANCH_PLT },
721 { BFD_RELOC_METAG_GOTOFF, R_METAG_GOTOFF },
722 { BFD_RELOC_METAG_PLT, R_METAG_PLT },
723 { BFD_RELOC_METAG_COPY, R_METAG_COPY },
724 { BFD_RELOC_METAG_JMP_SLOT, R_METAG_JMP_SLOT },
725 { BFD_RELOC_METAG_RELATIVE, R_METAG_RELATIVE },
726 { BFD_RELOC_METAG_GLOB_DAT, R_METAG_GLOB_DAT },
727 { BFD_RELOC_METAG_TLS_GD, R_METAG_TLS_GD },
728 { BFD_RELOC_METAG_TLS_LDM, R_METAG_TLS_LDM },
729 { BFD_RELOC_METAG_TLS_LDO_HI16, R_METAG_TLS_LDO_HI16 },
730 { BFD_RELOC_METAG_TLS_LDO_LO16, R_METAG_TLS_LDO_LO16 },
731 { BFD_RELOC_METAG_TLS_LDO, R_METAG_TLS_LDO },
732 { BFD_RELOC_METAG_TLS_IE, R_METAG_TLS_IE },
733 { BFD_RELOC_METAG_TLS_IENONPIC, R_METAG_TLS_IENONPIC },
734 { BFD_RELOC_METAG_TLS_IENONPIC_HI16, R_METAG_TLS_IENONPIC_HI16 },
735 { BFD_RELOC_METAG_TLS_IENONPIC_LO16, R_METAG_TLS_IENONPIC_LO16 },
736 { BFD_RELOC_METAG_TLS_TPOFF, R_METAG_TLS_TPOFF },
737 { BFD_RELOC_METAG_TLS_DTPMOD, R_METAG_TLS_DTPMOD },
738 { BFD_RELOC_METAG_TLS_DTPOFF, R_METAG_TLS_DTPOFF },
739 { BFD_RELOC_METAG_TLS_LE, R_METAG_TLS_LE },
740 { BFD_RELOC_METAG_TLS_LE_HI16, R_METAG_TLS_LE_HI16 },
741 { BFD_RELOC_METAG_TLS_LE_LO16, R_METAG_TLS_LE_LO16 },
742 };
743
744 enum elf_metag_stub_type
745 {
746 metag_stub_long_branch,
747 metag_stub_long_branch_shared,
748 metag_stub_none
749 };
750
751 struct elf_metag_stub_hash_entry
752 {
753 /* Base hash table entry structure. */
754 struct bfd_hash_entry bh_root;
755
756 /* The stub section. */
757 asection *stub_sec;
758
759 /* Offset within stub_sec of the beginning of this stub. */
760 bfd_vma stub_offset;
761
762 /* Given the symbol's value and its section we can determine its final
763 value when building the stubs (so the stub knows where to jump. */
764 bfd_vma target_value;
765 asection *target_section;
766
767 enum elf_metag_stub_type stub_type;
768
769 /* The symbol table entry, if any, that this was derived from. */
770 struct elf_metag_link_hash_entry *hh;
771
772 /* And the reloc addend that this was derived from. */
773 bfd_vma addend;
774
775 /* Where this stub is being called from, or, in the case of combined
776 stub sections, the first input section in the group. */
777 asection *id_sec;
778 };
779
780 struct elf_metag_link_hash_entry
781 {
782 struct elf_link_hash_entry eh;
783
784 /* A pointer to the most recently used stub hash entry against this
785 symbol. */
786 struct elf_metag_stub_hash_entry *hsh_cache;
787
788 enum
789 {
790 GOT_UNKNOWN = 0, GOT_NORMAL = 1, GOT_TLS_IE = 2, GOT_TLS_LDM = 4, GOT_TLS_GD = 8
791 } tls_type;
792 };
793
794 struct elf_metag_link_hash_table
795 {
796 /* The main hash table. */
797 struct elf_link_hash_table etab;
798
799 /* The stub hash table. */
800 struct bfd_hash_table bstab;
801
802 /* Linker stub bfd. */
803 bfd *stub_bfd;
804
805 /* Linker call-backs. */
806 asection * (*add_stub_section) (const char *, asection *);
807 void (*layout_sections_again) (void);
808
809 /* Array to keep track of which stub sections have been created, and
810 information on stub grouping. */
811 struct map_stub
812 {
813 /* This is the section to which stubs in the group will be
814 attached. */
815 asection *link_sec;
816 /* The stub section. */
817 asection *stub_sec;
818 } *stub_group;
819
820 /* Assorted information used by elf_metag_size_stubs. */
821 unsigned int bfd_count;
822 unsigned int top_index;
823 asection **input_list;
824 Elf_Internal_Sym **all_local_syms;
825
826 /* Data for LDM relocations. */
827 union
828 {
829 bfd_signed_vma refcount;
830 bfd_vma offset;
831 } tls_ldm_got;
832 };
833
834 /* Return the base vma address which should be subtracted from the
835 real address when resolving a dtpoff relocation. This is PT_TLS
836 segment p_vaddr. */
837 static bfd_vma
dtpoff_base(struct bfd_link_info * info)838 dtpoff_base (struct bfd_link_info *info)
839 {
840 /* If tls_sec is NULL, we should have signalled an error already. */
841 if (elf_hash_table (info)->tls_sec == NULL)
842 return 0;
843 return elf_hash_table (info)->tls_sec->vma;
844 }
845
846 /* Return the relocation value for R_METAG_TLS_IE */
847 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)848 tpoff (struct bfd_link_info *info, bfd_vma address)
849 {
850 /* If tls_sec is NULL, we should have signalled an error already. */
851 if (elf_hash_table (info)->tls_sec == NULL)
852 return 0;
853 /* METAG TLS ABI is variant I and static TLS blocks start just after
854 tcbhead structure which has 2 pointer fields. */
855 return (address - elf_hash_table (info)->tls_sec->vma
856 + align_power ((bfd_vma) 8,
857 elf_hash_table (info)->tls_sec->alignment_power));
858 }
859
860 static bool
metag_info_to_howto_rela(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)861 metag_info_to_howto_rela (bfd *abfd,
862 arelent *cache_ptr,
863 Elf_Internal_Rela *dst)
864 {
865 unsigned int r_type;
866
867 r_type = ELF32_R_TYPE (dst->r_info);
868 if (r_type >= (unsigned int) R_METAG_MAX)
869 {
870 /* xgettext:c-format */
871 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
872 abfd, r_type);
873 bfd_set_error (bfd_error_bad_value);
874 return false;
875 }
876 cache_ptr->howto = & elf_metag_howto_table [r_type];
877 return true;
878 }
879
880 static reloc_howto_type *
metag_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)881 metag_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
882 bfd_reloc_code_real_type code)
883 {
884 unsigned int i;
885
886 for (i = 0; i < sizeof (metag_reloc_map) / sizeof (metag_reloc_map[0]); i++)
887 if (metag_reloc_map [i].bfd_reloc_val == code)
888 return & elf_metag_howto_table [metag_reloc_map[i].metag_reloc_val];
889
890 return NULL;
891 }
892
893 static reloc_howto_type *
metag_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)894 metag_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
895 const char *r_name)
896 {
897 unsigned int i;
898
899 for (i = 0; i < sizeof (elf_metag_howto_table) / sizeof (elf_metag_howto_table[0]); i++)
900 if (elf_metag_howto_table[i].name != NULL
901 && strcasecmp (elf_metag_howto_table[i].name, r_name) == 0)
902 return &elf_metag_howto_table[i];
903
904 return NULL;
905 }
906
907 /* Various hash macros and functions. */
908 #define metag_link_hash_table(p) \
909 ((is_elf_hash_table ((p)->hash) \
910 && elf_hash_table_id (elf_hash_table (p)) == METAG_ELF_DATA) \
911 ? (struct elf_metag_link_hash_table *) (p)->hash : NULL)
912
913 #define metag_elf_hash_entry(ent) \
914 ((struct elf_metag_link_hash_entry *)(ent))
915
916 #define metag_stub_hash_entry(ent) \
917 ((struct elf_metag_stub_hash_entry *)(ent))
918
919 #define metag_stub_hash_lookup(table, string, create, copy) \
920 ((struct elf_metag_stub_hash_entry *) \
921 bfd_hash_lookup ((table), (string), (create), (copy)))
922
923 #define metag_elf_local_got_tls_type(abfd) \
924 ((char *)(elf_local_got_offsets (abfd) + (elf_tdata (abfd)->symtab_hdr.sh_info)))
925
926 /* Assorted hash table functions. */
927
928 /* Initialize an entry in the stub hash table. */
929
930 static struct bfd_hash_entry *
stub_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)931 stub_hash_newfunc (struct bfd_hash_entry *entry,
932 struct bfd_hash_table *table,
933 const char *string)
934 {
935 /* Allocate the structure if it has not already been allocated by a
936 subclass. */
937 if (entry == NULL)
938 {
939 entry = bfd_hash_allocate (table,
940 sizeof (struct elf_metag_stub_hash_entry));
941 if (entry == NULL)
942 return entry;
943 }
944
945 /* Call the allocation method of the superclass. */
946 entry = bfd_hash_newfunc (entry, table, string);
947 if (entry != NULL)
948 {
949 struct elf_metag_stub_hash_entry *hsh;
950
951 /* Initialize the local fields. */
952 hsh = (struct elf_metag_stub_hash_entry *) entry;
953 hsh->stub_sec = NULL;
954 hsh->stub_offset = 0;
955 hsh->target_value = 0;
956 hsh->target_section = NULL;
957 hsh->stub_type = metag_stub_long_branch;
958 hsh->hh = NULL;
959 hsh->id_sec = NULL;
960 }
961
962 return entry;
963 }
964
965 /* Initialize an entry in the link hash table. */
966
967 static struct bfd_hash_entry *
metag_link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)968 metag_link_hash_newfunc (struct bfd_hash_entry *entry,
969 struct bfd_hash_table *table,
970 const char *string)
971 {
972 /* Allocate the structure if it has not already been allocated by a
973 subclass. */
974 if (entry == NULL)
975 {
976 entry = bfd_hash_allocate (table,
977 sizeof (struct elf_metag_link_hash_entry));
978 if (entry == NULL)
979 return entry;
980 }
981
982 /* Call the allocation method of the superclass. */
983 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
984 if (entry != NULL)
985 {
986 struct elf_metag_link_hash_entry *hh;
987
988 /* Initialize the local fields. */
989 hh = (struct elf_metag_link_hash_entry *) entry;
990 hh->hsh_cache = NULL;
991 hh->tls_type = GOT_UNKNOWN;
992 }
993
994 return entry;
995 }
996
997 /* Free the derived linker hash table. */
998
999 static void
elf_metag_link_hash_table_free(bfd * obfd)1000 elf_metag_link_hash_table_free (bfd *obfd)
1001 {
1002 struct elf_metag_link_hash_table *htab
1003 = (struct elf_metag_link_hash_table *) obfd->link.hash;
1004
1005 bfd_hash_table_free (&htab->bstab);
1006 _bfd_elf_link_hash_table_free (obfd);
1007 }
1008
1009 /* Create the derived linker hash table. The Meta ELF port uses the derived
1010 hash table to keep information specific to the Meta ELF linker (without
1011 using static variables). */
1012
1013 static struct bfd_link_hash_table *
elf_metag_link_hash_table_create(bfd * abfd)1014 elf_metag_link_hash_table_create (bfd *abfd)
1015 {
1016 struct elf_metag_link_hash_table *htab;
1017 size_t amt = sizeof (*htab);
1018
1019 htab = bfd_zmalloc (amt);
1020 if (htab == NULL)
1021 return NULL;
1022
1023 if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd,
1024 metag_link_hash_newfunc,
1025 sizeof (struct elf_metag_link_hash_entry),
1026 METAG_ELF_DATA))
1027 {
1028 free (htab);
1029 return NULL;
1030 }
1031
1032 /* Init the stub hash table too. */
1033 if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc,
1034 sizeof (struct elf_metag_stub_hash_entry)))
1035 {
1036 _bfd_elf_link_hash_table_free (abfd);
1037 return NULL;
1038 }
1039 htab->etab.root.hash_table_free = elf_metag_link_hash_table_free;
1040 htab->etab.dt_pltgot_required = true;
1041
1042 return &htab->etab.root;
1043 }
1044
1045 /* Section name for stubs is the associated section name plus this
1046 string. */
1047 #define STUB_SUFFIX ".stub"
1048
1049 /* Build a name for an entry in the stub hash table. */
1050
1051 static char *
metag_stub_name(const asection * input_section,const asection * sym_sec,const struct elf_metag_link_hash_entry * hh,const Elf_Internal_Rela * rel)1052 metag_stub_name (const asection *input_section,
1053 const asection *sym_sec,
1054 const struct elf_metag_link_hash_entry *hh,
1055 const Elf_Internal_Rela *rel)
1056 {
1057 char *stub_name;
1058 bfd_size_type len;
1059
1060 if (hh)
1061 {
1062 len = 8 + 1 + strlen (hh->eh.root.root.string) + 1 + 8 + 1;
1063 stub_name = bfd_malloc (len);
1064 if (stub_name != NULL)
1065 {
1066 sprintf (stub_name, "%08x_%s+%x",
1067 input_section->id & 0xffffffff,
1068 hh->eh.root.root.string,
1069 (int) rel->r_addend & 0xffffffff);
1070 }
1071 }
1072 else
1073 {
1074 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1;
1075 stub_name = bfd_malloc (len);
1076 if (stub_name != NULL)
1077 {
1078 sprintf (stub_name, "%08x_%x:%x+%x",
1079 input_section->id & 0xffffffff,
1080 sym_sec->id & 0xffffffff,
1081 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff,
1082 (int) rel->r_addend & 0xffffffff);
1083 }
1084 }
1085 return stub_name;
1086 }
1087
1088 /* Look up an entry in the stub hash. Stub entries are cached because
1089 creating the stub name takes a bit of time. */
1090
1091 static struct elf_metag_stub_hash_entry *
metag_get_stub_entry(const asection * input_section,const asection * sym_sec,struct elf_metag_link_hash_entry * hh,const Elf_Internal_Rela * rel,struct elf_metag_link_hash_table * htab)1092 metag_get_stub_entry (const asection *input_section,
1093 const asection *sym_sec,
1094 struct elf_metag_link_hash_entry *hh,
1095 const Elf_Internal_Rela *rel,
1096 struct elf_metag_link_hash_table *htab)
1097 {
1098 struct elf_metag_stub_hash_entry *hsh;
1099 const asection *id_sec;
1100
1101 /* If this input section is part of a group of sections sharing one
1102 stub section, then use the id of the first section in the group.
1103 Stub names need to include a section id, as there may well be
1104 more than one stub used to reach say, printf, and we need to
1105 distinguish between them. */
1106 id_sec = htab->stub_group[input_section->id].link_sec;
1107
1108 if (hh != NULL && hh->hsh_cache != NULL
1109 && hh->hsh_cache->hh == hh
1110 && hh->hsh_cache->id_sec == id_sec)
1111 {
1112 hsh = hh->hsh_cache;
1113 }
1114 else
1115 {
1116 char *stub_name;
1117
1118 stub_name = metag_stub_name (id_sec, sym_sec, hh, rel);
1119 if (stub_name == NULL)
1120 return NULL;
1121
1122 hsh = metag_stub_hash_lookup (&htab->bstab,
1123 stub_name, false, false);
1124
1125 if (hh != NULL)
1126 hh->hsh_cache = hsh;
1127
1128 free (stub_name);
1129 }
1130
1131 return hsh;
1132 }
1133
1134 /* Add a new stub entry to the stub hash. Not all fields of the new
1135 stub entry are initialised. */
1136
1137 static struct elf_metag_stub_hash_entry *
metag_add_stub(const char * stub_name,asection * section,struct elf_metag_link_hash_table * htab)1138 metag_add_stub (const char *stub_name,
1139 asection *section,
1140 struct elf_metag_link_hash_table *htab)
1141 {
1142 asection *link_sec;
1143 asection *stub_sec;
1144 struct elf_metag_stub_hash_entry *hsh;
1145
1146 link_sec = htab->stub_group[section->id].link_sec;
1147 stub_sec = htab->stub_group[section->id].stub_sec;
1148 if (stub_sec == NULL)
1149 {
1150 stub_sec = htab->stub_group[link_sec->id].stub_sec;
1151 if (stub_sec == NULL)
1152 {
1153 size_t namelen;
1154 bfd_size_type len;
1155 char *s_name;
1156
1157 namelen = strlen (link_sec->name);
1158 len = namelen + sizeof (STUB_SUFFIX);
1159 s_name = bfd_alloc (htab->stub_bfd, len);
1160 if (s_name == NULL)
1161 return NULL;
1162
1163 memcpy (s_name, link_sec->name, namelen);
1164 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
1165
1166 stub_sec = (*htab->add_stub_section) (s_name, link_sec);
1167 if (stub_sec == NULL)
1168 return NULL;
1169 htab->stub_group[link_sec->id].stub_sec = stub_sec;
1170 }
1171 htab->stub_group[section->id].stub_sec = stub_sec;
1172 }
1173
1174 /* Enter this entry into the linker stub hash table. */
1175 hsh = metag_stub_hash_lookup (&htab->bstab, stub_name,
1176 true, false);
1177 if (hsh == NULL)
1178 {
1179 /* xgettext:c-format */
1180 _bfd_error_handler (_("%pB: cannot create stub entry %s"),
1181 section->owner, stub_name);
1182 return NULL;
1183 }
1184
1185 hsh->stub_sec = stub_sec;
1186 hsh->stub_offset = 0;
1187 hsh->id_sec = link_sec;
1188 return hsh;
1189 }
1190
1191 /* Check a signed integer value can be represented in the given number
1192 of bits. */
1193
1194 static bool
within_signed_range(int value,unsigned int bits)1195 within_signed_range (int value, unsigned int bits)
1196 {
1197 int min_val = -(1 << (bits - 1));
1198 int max_val = (1 << (bits - 1)) - 1;
1199 return (value <= max_val) && (value >= min_val);
1200 }
1201
1202 /* Perform a relocation as part of a final link. */
1203
1204 static bfd_reloc_status_type
metag_final_link_relocate(reloc_howto_type * howto,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * rel,bfd_vma relocation,struct elf_metag_link_hash_entry * hh,struct elf_metag_link_hash_table * htab,asection * sym_sec)1205 metag_final_link_relocate (reloc_howto_type *howto,
1206 bfd *input_bfd,
1207 asection *input_section,
1208 bfd_byte *contents,
1209 Elf_Internal_Rela *rel,
1210 bfd_vma relocation,
1211 struct elf_metag_link_hash_entry *hh,
1212 struct elf_metag_link_hash_table *htab,
1213 asection *sym_sec)
1214 {
1215 bfd_reloc_status_type r = bfd_reloc_ok;
1216 bfd_byte *hit_data = contents + rel->r_offset;
1217 int opcode, op_shift, op_extended, l1, l2;
1218 bfd_signed_vma srel, addend = rel->r_addend;
1219 struct elf_metag_stub_hash_entry *hsh = NULL;
1220 bfd_vma location;
1221
1222 /* Find out where we are and where we're going. */
1223 location = (rel->r_offset +
1224 input_section->output_offset +
1225 input_section->output_section->vma);
1226
1227 switch (howto->type)
1228 {
1229 case R_METAG_RELBRANCH:
1230 case R_METAG_RELBRANCH_PLT:
1231 /* Make it a pc relative offset. */
1232 relocation -= location;
1233 break;
1234 case R_METAG_TLS_GD:
1235 case R_METAG_TLS_IE:
1236 relocation -= elf_gp (input_section->output_section->owner);
1237 break;
1238 default:
1239 break;
1240 }
1241
1242 switch (howto->type)
1243 {
1244 case R_METAG_RELBRANCH_PLT:
1245 case R_METAG_RELBRANCH:
1246 opcode = bfd_get_32 (input_bfd, hit_data);
1247
1248 srel = (bfd_signed_vma) relocation;
1249 srel += addend;
1250
1251 /* If the branch is out of reach, then redirect the
1252 call to the local stub for this function. */
1253 if (srel > ((1 << (BRANCH_BITS + 1)) - 1) ||
1254 (srel < - (1 << (BRANCH_BITS + 1))))
1255 {
1256 if (sym_sec == NULL)
1257 break;
1258
1259 hsh = metag_get_stub_entry (input_section, sym_sec,
1260 hh, rel, htab);
1261 if (hsh == NULL)
1262 return bfd_reloc_undefined;
1263
1264 /* Munge up the value and addend so that we call the stub
1265 rather than the procedure directly. */
1266 srel = (hsh->stub_offset
1267 + hsh->stub_sec->output_offset
1268 + hsh->stub_sec->output_section->vma);
1269 srel -= location;
1270 }
1271
1272 srel = srel >> 2;
1273
1274 if (!within_signed_range (srel, BRANCH_BITS))
1275 {
1276 if (hh && hh->eh.root.type == bfd_link_hash_undefweak)
1277 srel = 0;
1278 else
1279 return bfd_reloc_overflow;
1280 }
1281
1282 opcode &= ~(0x7ffff << 5);
1283 opcode |= ((srel & 0x7ffff) << 5);
1284
1285 bfd_put_32 (input_bfd, opcode, hit_data);
1286 break;
1287 case R_METAG_GETSETOFF:
1288 case R_METAG_GETSET_GOT:
1289 case R_METAG_GETSET_GOTOFF:
1290 opcode = bfd_get_32 (input_bfd, hit_data);
1291
1292 srel = (bfd_signed_vma) relocation;
1293 srel += addend;
1294
1295 /* Is this a standard or extended GET/SET? */
1296 if ((opcode & 0xf0000000) == 0xa0000000)
1297 {
1298 /* Extended GET/SET. */
1299 l1 = opcode & 0x2;
1300 l2 = opcode & 0x4;
1301 op_extended = 1;
1302 }
1303 else
1304 {
1305 /* Standard GET/SET. */
1306 l1 = opcode & 0x01000000;
1307 l2 = opcode & 0x04000000;
1308 op_extended = 0;
1309 }
1310
1311 /* Calculate the width of the GET/SET and how much we need to
1312 shift the result by. */
1313 if (l2)
1314 if (l1)
1315 op_shift = 3;
1316 else
1317 op_shift = 2;
1318 else
1319 if (l1)
1320 op_shift = 1;
1321 else
1322 op_shift = 0;
1323
1324 /* GET/SET offsets are scaled by the width of the transfer. */
1325 srel = srel >> op_shift;
1326
1327 /* Extended GET/SET has signed 12 bits of offset, standard has
1328 signed 6 bits. */
1329 if (op_extended)
1330 {
1331 if (!within_signed_range (srel, 12))
1332 {
1333 if (hh && hh->eh.root.type == bfd_link_hash_undefweak)
1334 srel = 0;
1335 else
1336 return bfd_reloc_overflow;
1337 }
1338 opcode &= ~(0xfff << 7);
1339 opcode |= ((srel & 0xfff) << 7);
1340 }
1341 else
1342 {
1343 if (!within_signed_range (srel, 5))
1344 {
1345 if (hh && hh->eh.root.type == bfd_link_hash_undefweak)
1346 srel = 0;
1347 else
1348 return bfd_reloc_overflow;
1349 }
1350 opcode &= ~(0x3f << 8);
1351 opcode |= ((srel & 0x3f) << 8);
1352 }
1353
1354 bfd_put_32 (input_bfd, opcode, hit_data);
1355 break;
1356 case R_METAG_TLS_GD:
1357 case R_METAG_TLS_LDM:
1358 opcode = bfd_get_32 (input_bfd, hit_data);
1359
1360 if ((bfd_signed_vma)relocation < 0)
1361 {
1362 /* sign extend immediate */
1363 if ((opcode & 0xf2000001) == 0x02000000)
1364 {
1365 /* ADD De.e,Dx.r,#I16 */
1366 /* set SE bit */
1367 opcode |= (1 << 1);
1368 } else
1369 return bfd_reloc_overflow;
1370 }
1371
1372 bfd_put_32 (input_bfd, opcode, hit_data);
1373
1374 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1375 contents, rel->r_offset,
1376 relocation, rel->r_addend);
1377 break;
1378 default:
1379 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1380 contents, rel->r_offset,
1381 relocation, rel->r_addend);
1382 }
1383
1384 return r;
1385 }
1386
1387 /* This is defined because R_METAG_NONE != 0...
1388 See RELOC_AGAINST_DISCARDED_SECTION for details. */
1389 #define METAG_RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
1390 rel, relend, howto, contents) \
1391 { \
1392 _bfd_clear_contents (howto, input_bfd, input_section, \
1393 contents, rel->r_offset); \
1394 \
1395 if (bfd_link_relocatable (info) \
1396 && (input_section->flags & SEC_DEBUGGING)) \
1397 { \
1398 /* Only remove relocations in debug sections since other \
1399 sections may require relocations. */ \
1400 Elf_Internal_Shdr *rel_hdr; \
1401 \
1402 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
1403 \
1404 /* Avoid empty output section. */ \
1405 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
1406 { \
1407 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
1408 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
1409 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
1410 \
1411 memmove (rel, rel + 1, (relend - rel) * sizeof (*rel)); \
1412 \
1413 input_section->reloc_count--; \
1414 relend--; \
1415 rel--; \
1416 continue; \
1417 } \
1418 } \
1419 \
1420 rel->r_info = R_METAG_NONE; \
1421 rel->r_addend = 0; \
1422 continue; \
1423 }
1424
1425 /* Relocate a META ELF section.
1426
1427 The RELOCATE_SECTION function is called by the new ELF backend linker
1428 to handle the relocations for a section.
1429
1430 The relocs are always passed as Rela structures; if the section
1431 actually uses Rel structures, the r_addend field will always be
1432 zero.
1433
1434 This function is responsible for adjusting the section contents as
1435 necessary, and (if using Rela relocs and generating a relocatable
1436 output file) adjusting the reloc addend as necessary.
1437
1438 This function does not have to worry about setting the reloc
1439 address or the reloc symbol index.
1440
1441 LOCAL_SYMS is a pointer to the swapped in local symbols.
1442
1443 LOCAL_SECTIONS is an array giving the section in the input file
1444 corresponding to the st_shndx field of each local symbol.
1445
1446 The global hash table entry for the global symbols can be found
1447 via elf_sym_hashes (input_bfd).
1448
1449 When generating relocatable output, this function must handle
1450 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1451 going to be the section symbol corresponding to the output
1452 section, which means that the addend must be adjusted
1453 accordingly. */
1454
1455 static int
elf_metag_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)1456 elf_metag_relocate_section (bfd *output_bfd,
1457 struct bfd_link_info *info,
1458 bfd *input_bfd,
1459 asection *input_section,
1460 bfd_byte *contents,
1461 Elf_Internal_Rela *relocs,
1462 Elf_Internal_Sym *local_syms,
1463 asection **local_sections)
1464 {
1465 bfd_vma *local_got_offsets;
1466 Elf_Internal_Shdr *symtab_hdr;
1467 struct elf_link_hash_entry **eh_syms;
1468 struct elf_metag_link_hash_table *htab;
1469 Elf_Internal_Rela *rel;
1470 Elf_Internal_Rela *relend;
1471 asection *sreloc;
1472
1473 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
1474 eh_syms = elf_sym_hashes (input_bfd);
1475 relend = relocs + input_section->reloc_count;
1476
1477 htab = metag_link_hash_table (info);
1478 local_got_offsets = elf_local_got_offsets (input_bfd);
1479
1480 sreloc = NULL;
1481
1482 for (rel = relocs; rel < relend; rel ++)
1483 {
1484 reloc_howto_type *howto;
1485 unsigned long r_symndx;
1486 Elf_Internal_Sym *sym;
1487 asection *sec;
1488 struct elf_metag_link_hash_entry *hh;
1489 bfd_vma relocation;
1490 bfd_reloc_status_type r;
1491 const char *name;
1492 int r_type;
1493
1494 r_type = ELF32_R_TYPE (rel->r_info);
1495
1496 if (r_type == R_METAG_GNU_VTINHERIT
1497 || r_type == R_METAG_GNU_VTENTRY
1498 || r_type == R_METAG_NONE)
1499 continue;
1500
1501 r_symndx = ELF32_R_SYM (rel->r_info);
1502
1503 howto = elf_metag_howto_table + ELF32_R_TYPE (rel->r_info);
1504 hh = NULL;
1505 sym = NULL;
1506 sec = NULL;
1507
1508 if (r_symndx < symtab_hdr->sh_info)
1509 {
1510 sym = local_syms + r_symndx;
1511 sec = local_sections [r_symndx];
1512 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1513
1514 name = bfd_elf_string_from_elf_section
1515 (input_bfd, symtab_hdr->sh_link, sym->st_name);
1516 name = name == NULL ? bfd_section_name (sec) : name;
1517 }
1518 else
1519 {
1520 struct elf_link_hash_entry *eh;
1521 bool unresolved_reloc, warned, ignored;
1522
1523 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1524 r_symndx, symtab_hdr, eh_syms,
1525 eh, sec, relocation,
1526 unresolved_reloc, warned, ignored);
1527
1528 name = eh->root.root.string;
1529 hh = (struct elf_metag_link_hash_entry *) eh;
1530 }
1531
1532 if (sec != NULL && discarded_section (sec))
1533 METAG_RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1534 rel, relend, howto, contents);
1535
1536 if (bfd_link_relocatable (info))
1537 continue;
1538
1539 switch (r_type)
1540 {
1541 case R_METAG_ADDR32:
1542 case R_METAG_RELBRANCH:
1543 if ((input_section->flags & SEC_ALLOC) == 0)
1544 break;
1545
1546 if ((bfd_link_pic (info)
1547 && r_symndx != STN_UNDEF
1548 && (input_section->flags & SEC_ALLOC) != 0
1549 && !(r_type == R_METAG_RELBRANCH
1550 && (hh == NULL || SYMBOL_CALLS_LOCAL (info, &hh->eh))))
1551 || (!bfd_link_pic (info)
1552 && hh != NULL
1553 && hh->eh.dynindx != -1
1554 && !hh->eh.non_got_ref
1555 && ((hh->eh.def_dynamic
1556 && !hh->eh.def_regular)
1557 || hh->eh.root.type == bfd_link_hash_undefweak
1558 || hh->eh.root.type == bfd_link_hash_undefined)))
1559 {
1560 Elf_Internal_Rela outrel;
1561 bool skip, relocate;
1562 bfd_byte *loc;
1563
1564 /* When generating a shared object, these relocations
1565 are copied into the output file to be resolved at run
1566 time. */
1567
1568 sreloc = elf_section_data (input_section)->sreloc;
1569 BFD_ASSERT (sreloc != NULL);
1570
1571 skip = false;
1572 relocate = false;
1573
1574 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
1575 info,
1576 input_section,
1577 rel->r_offset);
1578 if (outrel.r_offset == (bfd_vma) -1)
1579 skip = true;
1580 else if (outrel.r_offset == (bfd_vma) -2)
1581 skip = true, relocate = true;
1582 outrel.r_offset += (input_section->output_section->vma
1583 + input_section->output_offset);
1584
1585 if (skip)
1586 {
1587 memset (&outrel, 0, sizeof outrel);
1588 outrel.r_info = ELF32_R_INFO (0, R_METAG_NONE);
1589 }
1590 else if (r_type == R_METAG_RELBRANCH)
1591 {
1592 BFD_ASSERT (hh != NULL && hh->eh.dynindx != -1);
1593 outrel.r_info = ELF32_R_INFO (hh->eh.dynindx, r_type);
1594 outrel.r_addend = rel->r_addend;
1595 }
1596 else
1597 {
1598 /* h->dynindx may be -1 if this symbol was marked to
1599 become local. */
1600 if (hh == NULL
1601 || ((info->symbolic || hh->eh.dynindx == -1)
1602 && hh->eh.def_regular))
1603 {
1604 relocate = true;
1605 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE);
1606 outrel.r_addend = relocation + rel->r_addend;
1607 }
1608 else
1609 {
1610 BFD_ASSERT (hh->eh.dynindx != -1);
1611 outrel.r_info = ELF32_R_INFO (hh->eh.dynindx, r_type);
1612 outrel.r_addend = rel->r_addend;
1613 }
1614 }
1615
1616 loc = sreloc->contents;
1617 loc += sreloc->reloc_count * sizeof(Elf32_External_Rela);
1618 bfd_elf32_swap_reloca_out (output_bfd, &outrel,loc);
1619 ++sreloc->reloc_count;
1620
1621 /* If this reloc is against an external symbol, we do
1622 not want to fiddle with the addend. Otherwise, we
1623 need to include the symbol value so that it becomes
1624 an addend for the dynamic reloc. */
1625 if (! relocate)
1626 continue;
1627 }
1628 break;
1629
1630 case R_METAG_RELBRANCH_PLT:
1631 /* Relocation is to the entry for this symbol in the
1632 procedure linkage table. */
1633
1634 if (hh == NULL)
1635 break;
1636
1637 if (hh->eh.forced_local)
1638 break;
1639
1640 if (hh->eh.plt.offset == (bfd_vma) -1 || htab->etab.splt == NULL)
1641 {
1642 /* We didn't make a PLT entry for this symbol. This
1643 happens when statically linking PIC code, or when
1644 using -Bsymbolic. */
1645 break;
1646 }
1647
1648 relocation = (htab->etab.splt->output_section->vma
1649 + htab->etab.splt->output_offset
1650 + hh->eh.plt.offset);
1651 break;
1652 case R_METAG_HI16_GOTPC:
1653 case R_METAG_LO16_GOTPC:
1654 BFD_ASSERT (htab->etab.sgot != NULL);
1655
1656 relocation = (htab->etab.sgot->output_section->vma +
1657 htab->etab.sgot->output_offset);
1658 relocation += GOT_REG_OFFSET;
1659 relocation -= (input_section->output_section->vma
1660 + input_section->output_offset
1661 + rel->r_offset);
1662 break;
1663 case R_METAG_HI16_GOTOFF:
1664 case R_METAG_LO16_GOTOFF:
1665 case R_METAG_GETSET_GOTOFF:
1666 BFD_ASSERT (htab->etab.sgot != NULL);
1667
1668 relocation -= (htab->etab.sgot->output_section->vma +
1669 htab->etab.sgot->output_offset);
1670 relocation -= GOT_REG_OFFSET;
1671 break;
1672 case R_METAG_GETSET_GOT:
1673 {
1674 bfd_vma off;
1675 bool do_got = 0;
1676
1677 /* Relocation is to the entry for this symbol in the
1678 global offset table. */
1679 if (hh != NULL)
1680 {
1681 bool dyn;
1682
1683 off = hh->eh.got.offset;
1684 dyn = htab->etab.dynamic_sections_created;
1685 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
1686 bfd_link_pic (info),
1687 &hh->eh))
1688 {
1689 /* If we aren't going to call finish_dynamic_symbol,
1690 then we need to handle initialisation of the .got
1691 entry and create needed relocs here. Since the
1692 offset must always be a multiple of 4, we use the
1693 least significant bit to record whether we have
1694 initialised it already. */
1695 if ((off & 1) != 0)
1696 off &= ~1;
1697 else
1698 {
1699 hh->eh.got.offset |= 1;
1700 do_got = 1;
1701 }
1702 }
1703 }
1704 else
1705 {
1706 /* Local symbol case. */
1707 if (local_got_offsets == NULL)
1708 abort ();
1709
1710 off = local_got_offsets[r_symndx];
1711
1712 /* The offset must always be a multiple of 4. We use
1713 the least significant bit to record whether we have
1714 already generated the necessary reloc. */
1715 if ((off & 1) != 0)
1716 off &= ~1;
1717 else
1718 {
1719 local_got_offsets[r_symndx] |= 1;
1720 do_got = 1;
1721 }
1722 }
1723
1724 if (do_got)
1725 {
1726 if (bfd_link_pic (info))
1727 {
1728 /* Output a dynamic relocation for this GOT entry.
1729 In this case it is relative to the base of the
1730 object because the symbol index is zero. */
1731 Elf_Internal_Rela outrel;
1732 bfd_byte *loc;
1733 asection *s = htab->etab.srelgot;
1734
1735 outrel.r_offset = (off
1736 + htab->etab.sgot->output_offset
1737 + htab->etab.sgot->output_section->vma);
1738 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE);
1739 outrel.r_addend = relocation;
1740 loc = s->contents;
1741 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1742 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1743 }
1744 else
1745 bfd_put_32 (output_bfd, relocation,
1746 htab->etab.sgot->contents + off);
1747 }
1748
1749 if (off >= (bfd_vma) -2)
1750 abort ();
1751
1752 relocation = off - GOT_REG_OFFSET;
1753 }
1754 break;
1755 case R_METAG_TLS_GD:
1756 case R_METAG_TLS_IE:
1757 {
1758 /* XXXMJF There is room here for optimisations. For example
1759 converting from GD->IE, etc. */
1760 bfd_vma off;
1761 int indx;
1762 char tls_type;
1763
1764 if (htab->etab.sgot == NULL)
1765 abort();
1766
1767 indx = 0;
1768 if (hh != NULL)
1769 {
1770 bool dyn;
1771 dyn = htab->etab.dynamic_sections_created;
1772
1773 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
1774 bfd_link_pic (info),
1775 &hh->eh)
1776 && (!bfd_link_pic (info)
1777 || !SYMBOL_REFERENCES_LOCAL (info, &hh->eh)))
1778 {
1779 indx = hh->eh.dynindx;
1780 }
1781 off = hh->eh.got.offset;
1782 tls_type = hh->tls_type;
1783 }
1784 else
1785 {
1786 /* Local symbol case. */
1787 if (local_got_offsets == NULL)
1788 abort ();
1789
1790 off = local_got_offsets[r_symndx];
1791 tls_type = metag_elf_local_got_tls_type (input_bfd) [r_symndx];
1792 }
1793
1794 if (tls_type == GOT_UNKNOWN)
1795 abort ();
1796
1797 if ((off & 1) != 0)
1798 off &= ~1;
1799 else
1800 {
1801 bool need_relocs = false;
1802 Elf_Internal_Rela outrel;
1803 bfd_byte *loc = NULL;
1804 int cur_off = off;
1805
1806 /* The GOT entries have not been initialized yet. Do it
1807 now, and emit any relocations. If both an IE GOT and a
1808 GD GOT are necessary, we emit the GD first. */
1809
1810 if ((bfd_link_pic (info) || indx != 0)
1811 && (hh == NULL
1812 || ELF_ST_VISIBILITY (hh->eh.other) == STV_DEFAULT
1813 || hh->eh.root.type != bfd_link_hash_undefweak))
1814 {
1815 need_relocs = true;
1816 loc = htab->etab.srelgot->contents;
1817 /* FIXME (CAO): Should this be reloc_count++ ? */
1818 loc += htab->etab.srelgot->reloc_count * sizeof (Elf32_External_Rela);
1819 }
1820
1821 if (tls_type & GOT_TLS_GD)
1822 {
1823 if (need_relocs)
1824 {
1825 outrel.r_offset = (cur_off
1826 + htab->etab.sgot->output_section->vma
1827 + htab->etab.sgot->output_offset);
1828 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_DTPMOD);
1829 outrel.r_addend = 0;
1830 bfd_put_32 (output_bfd, 0, htab->etab.sgot->contents + cur_off);
1831
1832 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1833 htab->etab.srelgot->reloc_count++;
1834 loc += sizeof (Elf32_External_Rela);
1835
1836 if (indx == 0)
1837 bfd_put_32 (output_bfd, 0,
1838 htab->etab.sgot->contents + cur_off + 4);
1839 else
1840 {
1841 bfd_put_32 (output_bfd, 0,
1842 htab->etab.sgot->contents + cur_off + 4);
1843 outrel.r_info = ELF32_R_INFO (indx,
1844 R_METAG_TLS_DTPOFF);
1845 outrel.r_offset += 4;
1846 bfd_elf32_swap_reloca_out (output_bfd,
1847 &outrel, loc);
1848 htab->etab.srelgot->reloc_count++;
1849 loc += sizeof (Elf32_External_Rela);
1850 }
1851 }
1852 else
1853 {
1854 /* We don't support changing the TLS model. */
1855 /* PR 20675 */
1856 if (bfd_link_pic (info))
1857 _bfd_error_handler (_("%pB(%pA): multiple TLS models are not supported"),
1858 input_bfd, input_section);
1859 else
1860 _bfd_error_handler (_("%pB(%pA): shared library symbol %s encountered whilst performing a static link"),
1861 input_bfd, input_section, name);
1862 return false;
1863 }
1864
1865 cur_off += 8;
1866 }
1867
1868 if (tls_type & GOT_TLS_IE)
1869 {
1870 if (need_relocs)
1871 {
1872 outrel.r_offset = (cur_off
1873 + htab->etab.sgot->output_section->vma
1874 + htab->etab.sgot->output_offset);
1875 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_TPOFF);
1876
1877 if (indx == 0)
1878 outrel.r_addend = relocation - dtpoff_base (info);
1879 else
1880 outrel.r_addend = 0;
1881
1882 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1883 htab->etab.srelgot->reloc_count++;
1884 loc += sizeof (Elf32_External_Rela);
1885 }
1886 else
1887 bfd_put_32 (output_bfd, tpoff (info, relocation),
1888 htab->etab.sgot->contents + cur_off);
1889
1890 cur_off += 4;
1891 }
1892
1893 if (hh != NULL)
1894 hh->eh.got.offset |= 1;
1895 else
1896 local_got_offsets[r_symndx] |= 1;
1897 }
1898
1899 /* Add the base of the GOT to the relocation value. */
1900 relocation = off - GOT_REG_OFFSET;
1901
1902 break;
1903 }
1904
1905 case R_METAG_TLS_IENONPIC_HI16:
1906 case R_METAG_TLS_IENONPIC_LO16:
1907 case R_METAG_TLS_LE_HI16:
1908 case R_METAG_TLS_LE_LO16:
1909 if (bfd_link_pic (info))
1910 {
1911 _bfd_error_handler
1912 /* xgettext:c-format */
1913 (_("%pB(%pA+%#" PRIx64 "): "
1914 "%s relocation not permitted in shared object"),
1915 input_bfd, input_section, (uint64_t) rel->r_offset,
1916 howto->name);
1917 return false;
1918 }
1919 else
1920 relocation = tpoff (info, relocation);
1921 break;
1922 case R_METAG_TLS_LDO_HI16:
1923 case R_METAG_TLS_LDO_LO16:
1924 if (! bfd_link_pic (info))
1925 relocation = tpoff (info, relocation);
1926 else
1927 relocation -= dtpoff_base (info);
1928 break;
1929 case R_METAG_TLS_LDM:
1930 {
1931 bfd_vma off;
1932
1933 if (htab->etab.sgot == NULL)
1934 abort();
1935 off = htab->tls_ldm_got.offset;
1936 if (off & 1)
1937 off &= ~1;
1938 else
1939 {
1940 Elf_Internal_Rela outrel;
1941 bfd_byte *loc;
1942
1943 outrel.r_offset = (off
1944 + htab->etab.sgot->output_section->vma
1945 + htab->etab.sgot->output_offset);
1946
1947 outrel.r_addend = 0;
1948 outrel.r_info = ELF32_R_INFO (0, R_METAG_TLS_DTPMOD);
1949 loc = htab->etab.srelgot->contents;
1950 loc += htab->etab.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
1951 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1952 htab->tls_ldm_got.offset |= 1;
1953 }
1954
1955 relocation = off - GOT_REG_OFFSET;
1956 break;
1957 }
1958 default:
1959 break;
1960 }
1961
1962 r = metag_final_link_relocate (howto, input_bfd, input_section,
1963 contents, rel, relocation, hh, htab,
1964 sec);
1965
1966 if (r != bfd_reloc_ok)
1967 {
1968 const char * msg = (const char *) NULL;
1969
1970 switch (r)
1971 {
1972 case bfd_reloc_overflow:
1973 (*info->callbacks->reloc_overflow)
1974 (info, (hh ? &hh->eh.root : NULL), name, howto->name,
1975 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1976 break;
1977
1978 case bfd_reloc_undefined:
1979 (*info->callbacks->undefined_symbol)
1980 (info, name, input_bfd, input_section, rel->r_offset, true);
1981 break;
1982
1983 case bfd_reloc_outofrange:
1984 msg = _("internal error: out of range error");
1985 break;
1986
1987 case bfd_reloc_notsupported:
1988 msg = _("internal error: unsupported relocation error");
1989 break;
1990
1991 case bfd_reloc_dangerous:
1992 msg = _("internal error: dangerous relocation");
1993 break;
1994
1995 default:
1996 msg = _("internal error: unknown error");
1997 break;
1998 }
1999
2000 if (msg)
2001 (*info->callbacks->warning) (info, msg, name, input_bfd,
2002 input_section, rel->r_offset);
2003 }
2004 }
2005
2006 return true;
2007 }
2008
2009 /* Create the .plt and .got sections, and set up our hash table
2010 short-cuts to various dynamic sections. */
2011
2012 static bool
elf_metag_create_dynamic_sections(bfd * abfd,struct bfd_link_info * info)2013 elf_metag_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
2014 {
2015 struct elf_metag_link_hash_table *htab;
2016 struct elf_link_hash_entry *eh;
2017 struct bfd_link_hash_entry *bh;
2018 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2019
2020 /* Don't try to create the .plt and .got twice. */
2021 htab = metag_link_hash_table (info);
2022 if (htab->etab.splt != NULL)
2023 return true;
2024
2025 /* Call the generic code to do most of the work. */
2026 if (! _bfd_elf_create_dynamic_sections (abfd, info))
2027 return false;
2028
2029 /* The header goes at the start of the dynamic .got section, which
2030 is placed after the dynamic .got.plt section. ie. The header is
2031 not necessarily at the start of the output .got section. */
2032 htab->etab.sgot->size += 12;
2033
2034 /* Define the symbol __GLOBAL_OFFSET_TABLE__ on the header. */
2035 bh = NULL;
2036 if (!(_bfd_generic_link_add_one_symbol
2037 (info, abfd, "__GLOBAL_OFFSET_TABLE__", BSF_GLOBAL, htab->etab.sgot,
2038 (bfd_vma) 0, NULL, false, bed->collect, &bh)))
2039 return false;
2040 eh = (struct elf_link_hash_entry *) bh;
2041 eh->def_regular = 1;
2042 eh->type = STT_OBJECT;
2043 eh->other = STV_HIDDEN;
2044
2045 if (! bfd_link_executable (info)
2046 && ! bfd_elf_link_record_dynamic_symbol (info, eh))
2047 return false;
2048
2049 htab->etab.hgot = eh;
2050
2051 return true;
2052 }
2053
2054 /* Look through the relocs for a section during the first phase, and
2055 calculate needed space in the global offset table, procedure linkage
2056 table, and dynamic reloc sections. At this point we haven't
2057 necessarily read all the input files. */
2058
2059 static bool
elf_metag_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)2060 elf_metag_check_relocs (bfd *abfd,
2061 struct bfd_link_info *info,
2062 asection *sec,
2063 const Elf_Internal_Rela *relocs)
2064 {
2065 Elf_Internal_Shdr *symtab_hdr;
2066 struct elf_link_hash_entry **eh_syms;
2067 const Elf_Internal_Rela *rel;
2068 const Elf_Internal_Rela *rel_end;
2069 struct elf_metag_link_hash_table *htab;
2070 asection *sreloc;
2071 bfd *dynobj;
2072 int tls_type = GOT_UNKNOWN, old_tls_type = GOT_UNKNOWN;
2073
2074 if (bfd_link_relocatable (info))
2075 return true;
2076
2077 htab = metag_link_hash_table (info);
2078 dynobj = htab->etab.dynobj;
2079 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2080 eh_syms = elf_sym_hashes (abfd);
2081 sreloc = NULL;
2082
2083 if (htab == NULL)
2084 return false;
2085
2086 rel_end = relocs + sec->reloc_count;
2087 for (rel = relocs; rel < rel_end; rel++)
2088 {
2089 int r_type;
2090 struct elf_metag_link_hash_entry *hh;
2091 Elf_Internal_Sym *isym;
2092 unsigned long r_symndx;
2093
2094 r_symndx = ELF32_R_SYM (rel->r_info);
2095 r_type = ELF32_R_TYPE (rel->r_info);
2096 if (r_symndx < symtab_hdr->sh_info)
2097 {
2098 /* A local symbol. */
2099 isym = bfd_sym_from_r_symndx (&htab->etab.sym_cache,
2100 abfd, r_symndx);
2101 if (isym == NULL)
2102 return false;
2103
2104 hh = NULL;
2105 }
2106 else
2107 {
2108 isym = NULL;
2109
2110 hh = (struct elf_metag_link_hash_entry *)
2111 eh_syms[r_symndx - symtab_hdr->sh_info];
2112 while (hh->eh.root.type == bfd_link_hash_indirect
2113 || hh->eh.root.type == bfd_link_hash_warning)
2114 hh = (struct elf_metag_link_hash_entry *) hh->eh.root.u.i.link;
2115 }
2116
2117 /* Some relocs require a global offset table. */
2118 if (htab->etab.sgot == NULL)
2119 {
2120 switch (r_type)
2121 {
2122 case R_METAG_TLS_GD:
2123 case R_METAG_TLS_LDM:
2124 case R_METAG_TLS_IE:
2125 if (bfd_link_pic (info))
2126 info->flags |= DF_STATIC_TLS;
2127 /* Fall through. */
2128
2129 case R_METAG_HI16_GOTOFF:
2130 case R_METAG_LO16_GOTOFF:
2131 case R_METAG_GETSET_GOTOFF:
2132 case R_METAG_GETSET_GOT:
2133 case R_METAG_HI16_GOTPC:
2134 case R_METAG_LO16_GOTPC:
2135 if (dynobj == NULL)
2136 htab->etab.dynobj = dynobj = abfd;
2137 if (!elf_metag_create_dynamic_sections (dynobj, info))
2138 return false;
2139 break;
2140
2141 default:
2142 break;
2143 }
2144 }
2145
2146 switch (r_type)
2147 {
2148 case R_METAG_TLS_IE:
2149 case R_METAG_TLS_GD:
2150 case R_METAG_GETSET_GOT:
2151 switch (r_type)
2152 {
2153 default:
2154 tls_type = GOT_NORMAL;
2155 break;
2156 case R_METAG_TLS_IE:
2157 tls_type = GOT_TLS_IE;
2158 break;
2159 case R_METAG_TLS_GD:
2160 tls_type = GOT_TLS_GD;
2161 break;
2162 }
2163
2164 if (hh != NULL)
2165 {
2166 hh->eh.got.refcount += 1;
2167 old_tls_type = hh->tls_type;
2168 }
2169 else
2170 {
2171 bfd_signed_vma *local_got_refcounts;
2172
2173 /* This is a global offset table entry for a local
2174 symbol. */
2175 local_got_refcounts = elf_local_got_refcounts (abfd);
2176 if (local_got_refcounts == NULL)
2177 {
2178 bfd_size_type size;
2179
2180 size = symtab_hdr->sh_info;
2181 size *= sizeof (bfd_signed_vma);
2182 /* Add in space to store the local GOT TLS types. */
2183 size += symtab_hdr->sh_info;
2184 local_got_refcounts = ((bfd_signed_vma *)
2185 bfd_zalloc (abfd, size));
2186 if (local_got_refcounts == NULL)
2187 return false;
2188 elf_local_got_refcounts (abfd) = local_got_refcounts;
2189 memset (metag_elf_local_got_tls_type (abfd),
2190 GOT_UNKNOWN, symtab_hdr->sh_info);
2191 }
2192 local_got_refcounts[r_symndx] += 1;
2193 old_tls_type = metag_elf_local_got_tls_type (abfd) [r_symndx];
2194 }
2195
2196 if (old_tls_type != tls_type)
2197 {
2198 if (hh != NULL)
2199 {
2200 hh->tls_type = tls_type;
2201 }
2202 else
2203 {
2204 metag_elf_local_got_tls_type (abfd) [r_symndx] = tls_type;
2205 }
2206 }
2207
2208 break;
2209
2210 case R_METAG_TLS_LDM:
2211 metag_link_hash_table (info)->tls_ldm_got.refcount += 1;
2212 break;
2213
2214 case R_METAG_RELBRANCH_PLT:
2215 /* This symbol requires a procedure linkage table entry. We
2216 actually build the entry in adjust_dynamic_symbol,
2217 because this might be a case of linking PIC code without
2218 linking in any dynamic objects, in which case we don't
2219 need to generate a procedure linkage table after all. */
2220
2221 /* If this is a local symbol, we resolve it directly without
2222 creating a procedure linkage table entry. */
2223 if (hh == NULL)
2224 continue;
2225
2226 if (hh->eh.forced_local)
2227 break;
2228
2229 hh->eh.needs_plt = 1;
2230 hh->eh.plt.refcount += 1;
2231 break;
2232
2233 case R_METAG_HIADDR16:
2234 case R_METAG_LOADDR16:
2235 /* Let's help debug shared library creation. These relocs
2236 cannot be used in shared libs. Don't error out for
2237 sections we don't care about, such as debug sections or
2238 non-constant sections. */
2239 if (bfd_link_pic (info)
2240 && (sec->flags & SEC_ALLOC) != 0
2241 && (sec->flags & SEC_READONLY) != 0)
2242 {
2243 const char *name;
2244
2245 if (hh)
2246 name = hh->eh.root.root.string;
2247 else
2248 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2249 _bfd_error_handler
2250 /* xgettext:c-format */
2251 (_("%pB: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
2252 abfd, elf_metag_howto_table[r_type].name, name);
2253 bfd_set_error (bfd_error_bad_value);
2254 return false;
2255 }
2256
2257 /* Fall through. */
2258 case R_METAG_ADDR32:
2259 case R_METAG_RELBRANCH:
2260 case R_METAG_GETSETOFF:
2261 if (hh != NULL && !bfd_link_pic (info))
2262 {
2263 hh->eh.non_got_ref = 1;
2264 hh->eh.plt.refcount += 1;
2265 }
2266
2267 /* If we are creating a shared library, and this is a reloc
2268 against a global symbol, or a non PC relative reloc
2269 against a local symbol, then we need to copy the reloc
2270 into the shared library. However, if we are linking with
2271 -Bsymbolic, we do not need to copy a reloc against a
2272 global symbol which is defined in an object we are
2273 including in the link (i.e., DEF_REGULAR is set). At
2274 this point we have not seen all the input files, so it is
2275 possible that DEF_REGULAR is not set now but will be set
2276 later (it is never cleared). We account for that
2277 possibility below by storing information in the
2278 dyn_relocs field of the hash table entry. A similar
2279 situation occurs when creating shared libraries and symbol
2280 visibility changes render the symbol local.
2281
2282 If on the other hand, we are creating an executable, we
2283 may need to keep relocations for symbols satisfied by a
2284 dynamic library if we manage to avoid copy relocs for the
2285 symbol. */
2286 if ((bfd_link_pic (info)
2287 && (sec->flags & SEC_ALLOC) != 0
2288 && (r_type != R_METAG_RELBRANCH
2289 || (hh != NULL
2290 && (! info->symbolic
2291 || hh->eh.root.type == bfd_link_hash_defweak
2292 || !hh->eh.def_regular))))
2293 || (!bfd_link_pic (info)
2294 && (sec->flags & SEC_ALLOC) != 0
2295 && hh != NULL
2296 && (hh->eh.root.type == bfd_link_hash_defweak
2297 || !hh->eh.def_regular)))
2298 {
2299 struct elf_dyn_relocs *hdh_p;
2300 struct elf_dyn_relocs **hdh_head;
2301
2302 if (dynobj == NULL)
2303 htab->etab.dynobj = dynobj = abfd;
2304
2305 /* When creating a shared object, we must copy these
2306 relocs into the output file. We create a reloc
2307 section in dynobj and make room for the reloc. */
2308 if (sreloc == NULL)
2309 {
2310 sreloc = _bfd_elf_make_dynamic_reloc_section
2311 (sec, htab->etab.dynobj, 2, abfd, /*rela?*/ true);
2312
2313 if (sreloc == NULL)
2314 {
2315 bfd_set_error (bfd_error_bad_value);
2316 return false;
2317 }
2318
2319 elf_section_data (sec)->sreloc = sreloc;
2320 }
2321
2322 /* If this is a global symbol, we count the number of
2323 relocations we need for this symbol. */
2324 if (hh != NULL)
2325 hdh_head = &hh->eh.dyn_relocs;
2326 else
2327 {
2328 /* Track dynamic relocs needed for local syms too. */
2329 asection *sr;
2330 void *vpp;
2331
2332 sr = bfd_section_from_elf_index (abfd, isym->st_shndx);
2333 if (sr == NULL)
2334 sr = sec;
2335
2336 vpp = &elf_section_data (sr)->local_dynrel;
2337 hdh_head = (struct elf_dyn_relocs **) vpp;
2338 }
2339
2340 hdh_p = *hdh_head;
2341 if (hdh_p == NULL || hdh_p->sec != sec)
2342 {
2343 hdh_p = ((struct elf_dyn_relocs *)
2344 bfd_alloc (dynobj, sizeof *hdh_p));
2345 if (hdh_p == NULL)
2346 return false;
2347 hdh_p->next = *hdh_head;
2348 *hdh_head = hdh_p;
2349 hdh_p->sec = sec;
2350 hdh_p->count = 0;
2351 hdh_p->pc_count = 0;
2352 }
2353
2354 hdh_p->count += 1;
2355 if (ELF32_R_TYPE (rel->r_info) == R_METAG_RELBRANCH)
2356 hdh_p->pc_count += 1;
2357 }
2358 break;
2359
2360 /* This relocation describes the C++ object vtable hierarchy.
2361 Reconstruct it for later use during GC. */
2362 case R_METAG_GNU_VTINHERIT:
2363 if (!bfd_elf_gc_record_vtinherit (abfd, sec, &hh->eh,
2364 rel->r_offset))
2365 return false;
2366 break;
2367
2368 /* This relocation describes which C++ vtable entries are actually
2369 used. Record for later use during GC. */
2370 case R_METAG_GNU_VTENTRY:
2371 if (!bfd_elf_gc_record_vtentry (abfd, sec, &hh->eh, rel->r_addend))
2372 return false;
2373 break;
2374 }
2375 }
2376
2377 return true;
2378 }
2379
2380 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2381
2382 static void
elf_metag_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * eh_dir,struct elf_link_hash_entry * eh_ind)2383 elf_metag_copy_indirect_symbol (struct bfd_link_info *info,
2384 struct elf_link_hash_entry *eh_dir,
2385 struct elf_link_hash_entry *eh_ind)
2386 {
2387 struct elf_metag_link_hash_entry *hh_dir, *hh_ind;
2388
2389 hh_dir = metag_elf_hash_entry (eh_dir);
2390 hh_ind = metag_elf_hash_entry (eh_ind);
2391
2392 if (eh_ind->root.type == bfd_link_hash_indirect
2393 && eh_dir->got.refcount <= 0)
2394 {
2395 hh_dir->tls_type = hh_ind->tls_type;
2396 hh_ind->tls_type = GOT_UNKNOWN;
2397 }
2398
2399 _bfd_elf_link_hash_copy_indirect (info, eh_dir, eh_ind);
2400 }
2401
2402 /* Adjust a symbol defined by a dynamic object and referenced by a
2403 regular object. The current definition is in some section of the
2404 dynamic object, but we're not including those sections. We have to
2405 change the definition to something the rest of the link can
2406 understand. */
2407
2408 static bool
elf_metag_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * eh)2409 elf_metag_adjust_dynamic_symbol (struct bfd_link_info *info,
2410 struct elf_link_hash_entry *eh)
2411 {
2412 struct elf_metag_link_hash_table *htab;
2413 asection *s, *srel;
2414
2415 /* If this is a function, put it in the procedure linkage table. We
2416 will fill in the contents of the procedure linkage table later,
2417 when we know the address of the .got section. */
2418 if (eh->type == STT_FUNC
2419 || eh->needs_plt)
2420 {
2421 if (eh->plt.refcount <= 0
2422 || SYMBOL_CALLS_LOCAL (info, eh)
2423 || (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT
2424 && eh->root.type == bfd_link_hash_undefweak))
2425 {
2426 /* This case can occur if we saw a PLT reloc in an input
2427 file, but the symbol was never referred to by a dynamic
2428 object. In such a case, we don't actually need to build
2429 a procedure linkage table, and we can just do a PCREL
2430 reloc instead. */
2431 eh->plt.offset = (bfd_vma) -1;
2432 eh->needs_plt = 0;
2433 }
2434
2435 return true;
2436 }
2437 else
2438 eh->plt.offset = (bfd_vma) -1;
2439
2440 /* If this is a weak symbol, and there is a real definition, the
2441 processor independent code will have arranged for us to see the
2442 real definition first, and we can just use the same value. */
2443 if (eh->is_weakalias)
2444 {
2445 struct elf_link_hash_entry *def = weakdef (eh);
2446 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
2447 eh->root.u.def.section = def->root.u.def.section;
2448 eh->root.u.def.value = def->root.u.def.value;
2449 eh->non_got_ref = def->non_got_ref;
2450 return true;
2451 }
2452
2453 /* This is a reference to a symbol defined by a dynamic object which
2454 is not a function. */
2455
2456 /* If we are creating a shared library, we must presume that the
2457 only references to the symbol are via the global offset table.
2458 For such cases we need not do anything here; the relocations will
2459 be handled correctly by relocate_section. */
2460 if (bfd_link_pic (info))
2461 return true;
2462
2463 /* If there are no references to this symbol that do not use the
2464 GOT, we don't need to generate a copy reloc. */
2465 if (!eh->non_got_ref)
2466 return true;
2467
2468 /* If -z nocopyreloc was given, we won't generate them either. */
2469 if (info->nocopyreloc)
2470 {
2471 eh->non_got_ref = 0;
2472 return true;
2473 }
2474
2475 /* If we don't find any dynamic relocs in read-only sections, then
2476 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2477 if (!_bfd_elf_readonly_dynrelocs (eh))
2478 {
2479 eh->non_got_ref = 0;
2480 return true;
2481 }
2482
2483 /* We must allocate the symbol in our .dynbss section, which will
2484 become part of the .bss section of the executable. There will be
2485 an entry for this symbol in the .dynsym section. The dynamic
2486 object will contain position independent code, so all references
2487 from the dynamic object to this symbol will go through the global
2488 offset table. The dynamic linker will use the .dynsym entry to
2489 determine the address it must put in the global offset table, so
2490 both the dynamic object and the regular object will refer to the
2491 same memory location for the variable. */
2492
2493 htab = metag_link_hash_table (info);
2494
2495 /* We must generate a COPY reloc to tell the dynamic linker to
2496 copy the initial value out of the dynamic object and into the
2497 runtime process image. */
2498 if ((eh->root.u.def.section->flags & SEC_READONLY) != 0)
2499 {
2500 s = htab->etab.sdynrelro;
2501 srel = htab->etab.sreldynrelro;
2502 }
2503 else
2504 {
2505 s = htab->etab.sdynbss;
2506 srel = htab->etab.srelbss;
2507 }
2508 if ((eh->root.u.def.section->flags & SEC_ALLOC) != 0 && eh->size != 0)
2509 {
2510 srel->size += sizeof (Elf32_External_Rela);
2511 eh->needs_copy = 1;
2512 }
2513
2514 return _bfd_elf_adjust_dynamic_copy (info, eh, s);
2515 }
2516
2517 /* Allocate space in .plt, .got and associated reloc sections for
2518 global syms. */
2519
2520 static bool
allocate_dynrelocs(struct elf_link_hash_entry * eh,void * inf)2521 allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf)
2522 {
2523 struct bfd_link_info *info;
2524 struct elf_metag_link_hash_table *htab;
2525 struct elf_dyn_relocs *hdh_p;
2526
2527 if (eh->root.type == bfd_link_hash_indirect)
2528 return true;
2529
2530 if (eh->root.type == bfd_link_hash_warning)
2531 eh = (struct elf_link_hash_entry *) eh->root.u.i.link;
2532
2533 info = inf;
2534 htab = metag_link_hash_table (info);
2535
2536 if (htab->etab.dynamic_sections_created
2537 && eh->plt.refcount > 0)
2538 {
2539 /* Make sure this symbol is output as a dynamic symbol.
2540 Undefined weak syms won't yet be marked as dynamic. */
2541 if (eh->dynindx == -1
2542 && !eh->forced_local)
2543 {
2544 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2545 return false;
2546 }
2547
2548 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), eh))
2549 {
2550 asection *s = htab->etab.splt;
2551
2552 /* If this is the first .plt entry, make room for the special
2553 first entry. */
2554 if (s->size == 0)
2555 s->size += PLT_ENTRY_SIZE;
2556
2557 eh->plt.offset = s->size;
2558
2559 /* If this symbol is not defined in a regular file, and we are
2560 not generating a shared library, then set the symbol to this
2561 location in the .plt. This is required to make function
2562 pointers compare as equal between the normal executable and
2563 the shared library. */
2564 if (! bfd_link_pic (info)
2565 && !eh->def_regular)
2566 {
2567 eh->root.u.def.section = s;
2568 eh->root.u.def.value = eh->plt.offset;
2569 }
2570
2571 /* Make room for this entry. */
2572 s->size += PLT_ENTRY_SIZE;
2573
2574 /* We also need to make an entry in the .got.plt section, which
2575 will be placed in the .got section by the linker script. */
2576 htab->etab.sgotplt->size += 4;
2577
2578 /* We also need to make an entry in the .rel.plt section. */
2579 htab->etab.srelplt->size += sizeof (Elf32_External_Rela);
2580 }
2581 else
2582 {
2583 eh->plt.offset = (bfd_vma) -1;
2584 eh->needs_plt = 0;
2585 }
2586 }
2587 else
2588 {
2589 eh->plt.offset = (bfd_vma) -1;
2590 eh->needs_plt = 0;
2591 }
2592
2593 if (eh->got.refcount > 0)
2594 {
2595 asection *s;
2596 bool dyn;
2597 int tls_type = metag_elf_hash_entry (eh)->tls_type;
2598
2599 /* Make sure this symbol is output as a dynamic symbol.
2600 Undefined weak syms won't yet be marked as dynamic. */
2601 if (eh->dynindx == -1
2602 && !eh->forced_local)
2603 {
2604 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2605 return false;
2606 }
2607
2608 s = htab->etab.sgot;
2609
2610 eh->got.offset = s->size;
2611 s->size += 4;
2612 /* R_METAG_TLS_GD needs 2 consecutive GOT slots. */
2613 if (tls_type == GOT_TLS_GD)
2614 s->size += 4;
2615 dyn = htab->etab.dynamic_sections_created;
2616 /* R_METAG_TLS_IE needs one dynamic relocation if dynamic,
2617 R_METAG_TLS_GD needs one if local symbol and two if global. */
2618 if ((tls_type == GOT_TLS_GD && eh->dynindx == -1)
2619 || (tls_type == GOT_TLS_IE && dyn))
2620 htab->etab.srelgot->size += sizeof (Elf32_External_Rela);
2621 else if (tls_type == GOT_TLS_GD)
2622 htab->etab.srelgot->size += 2 * sizeof (Elf32_External_Rela);
2623 else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2624 bfd_link_pic (info),
2625 eh))
2626 htab->etab.srelgot->size += sizeof (Elf32_External_Rela);
2627 }
2628 else
2629 eh->got.offset = (bfd_vma) -1;
2630
2631 if (eh->dyn_relocs == NULL)
2632 return true;
2633
2634 /* If this is a -Bsymbolic shared link, then we need to discard all
2635 space allocated for dynamic pc-relative relocs against symbols
2636 defined in a regular object. For the normal shared case, discard
2637 space for relocs that have become local due to symbol visibility
2638 changes. */
2639 if (bfd_link_pic (info))
2640 {
2641 if (SYMBOL_CALLS_LOCAL (info, eh))
2642 {
2643 struct elf_dyn_relocs **hdh_pp;
2644
2645 for (hdh_pp = &eh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; )
2646 {
2647 hdh_p->count -= hdh_p->pc_count;
2648 hdh_p->pc_count = 0;
2649 if (hdh_p->count == 0)
2650 *hdh_pp = hdh_p->next;
2651 else
2652 hdh_pp = &hdh_p->next;
2653 }
2654 }
2655
2656 /* Also discard relocs on undefined weak syms with non-default
2657 visibility. */
2658 if (eh->dyn_relocs != NULL
2659 && eh->root.type == bfd_link_hash_undefweak)
2660 {
2661 if (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT)
2662 eh->dyn_relocs = NULL;
2663
2664 /* Make sure undefined weak symbols are output as a dynamic
2665 symbol in PIEs. */
2666 else if (eh->dynindx == -1
2667 && !eh->forced_local)
2668 {
2669 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2670 return false;
2671 }
2672 }
2673 }
2674 else
2675 {
2676 /* For the non-shared case, discard space for relocs against
2677 symbols which turn out to need copy relocs or are not
2678 dynamic. */
2679 if (!eh->non_got_ref
2680 && ((eh->def_dynamic
2681 && !eh->def_regular)
2682 || (htab->etab.dynamic_sections_created
2683 && (eh->root.type == bfd_link_hash_undefweak
2684 || eh->root.type == bfd_link_hash_undefined))))
2685 {
2686 /* Make sure this symbol is output as a dynamic symbol.
2687 Undefined weak syms won't yet be marked as dynamic. */
2688 if (eh->dynindx == -1
2689 && !eh->forced_local)
2690 {
2691 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2692 return false;
2693 }
2694
2695 /* If that succeeded, we know we'll be keeping all the
2696 relocs. */
2697 if (eh->dynindx != -1)
2698 goto keep;
2699 }
2700
2701 eh->dyn_relocs = NULL;
2702 return true;
2703
2704 keep: ;
2705 }
2706
2707 /* Finally, allocate space. */
2708 for (hdh_p = eh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->next)
2709 {
2710 asection *sreloc = elf_section_data (hdh_p->sec)->sreloc;
2711 sreloc->size += hdh_p->count * sizeof (Elf32_External_Rela);
2712 }
2713
2714 return true;
2715 }
2716
2717 /* Set the sizes of the dynamic sections. */
2718
2719 static bool
elf_metag_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)2720 elf_metag_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2721 struct bfd_link_info *info)
2722 {
2723 struct elf_metag_link_hash_table *htab;
2724 bfd *dynobj;
2725 bfd *ibfd;
2726 asection *s;
2727 bool relocs;
2728
2729 htab = metag_link_hash_table (info);
2730 dynobj = htab->etab.dynobj;
2731 if (dynobj == NULL)
2732 abort ();
2733
2734 if (htab->etab.dynamic_sections_created)
2735 {
2736 /* Set the contents of the .interp section to the interpreter. */
2737 if (bfd_link_executable (info) && !info->nointerp)
2738 {
2739 s = bfd_get_linker_section (dynobj, ".interp");
2740 if (s == NULL)
2741 abort ();
2742 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2743 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2744 }
2745 }
2746
2747 /* Set up .got offsets for local syms, and space for local dynamic
2748 relocs. */
2749 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2750 {
2751 bfd_signed_vma *local_got;
2752 bfd_signed_vma *end_local_got;
2753 bfd_size_type locsymcount;
2754 Elf_Internal_Shdr *symtab_hdr;
2755 asection *srel;
2756 char *local_tls_type;
2757
2758 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2759 continue;
2760
2761 for (s = ibfd->sections; s != NULL; s = s->next)
2762 {
2763 struct elf_dyn_relocs *hdh_p;
2764
2765 for (hdh_p = ((struct elf_dyn_relocs *)
2766 elf_section_data (s)->local_dynrel);
2767 hdh_p != NULL;
2768 hdh_p = hdh_p->next)
2769 {
2770 if (!bfd_is_abs_section (hdh_p->sec)
2771 && bfd_is_abs_section (hdh_p->sec->output_section))
2772 {
2773 /* Input section has been discarded, either because
2774 it is a copy of a linkonce section or due to
2775 linker script /DISCARD/, so we'll be discarding
2776 the relocs too. */
2777 }
2778 else if (hdh_p->count != 0)
2779 {
2780 srel = elf_section_data (hdh_p->sec)->sreloc;
2781 srel->size += hdh_p->count * sizeof (Elf32_External_Rela);
2782 if ((hdh_p->sec->output_section->flags & SEC_READONLY) != 0)
2783 info->flags |= DF_TEXTREL;
2784 }
2785 }
2786 }
2787
2788 local_got = elf_local_got_refcounts (ibfd);
2789 if (!local_got)
2790 continue;
2791
2792 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2793 locsymcount = symtab_hdr->sh_info;
2794 end_local_got = local_got + locsymcount;
2795 local_tls_type = metag_elf_local_got_tls_type (ibfd);
2796 s = htab->etab.sgot;
2797 srel = htab->etab.srelgot;
2798 for (; local_got < end_local_got; ++local_got)
2799 {
2800 if (*local_got > 0)
2801 {
2802 *local_got = s->size;
2803 s->size += GOT_ENTRY_SIZE;
2804 /* R_METAG_TLS_GD relocs need 2 consecutive GOT entries. */
2805 if (*local_tls_type == GOT_TLS_GD)
2806 s->size += 4;
2807 if (bfd_link_pic (info))
2808 srel->size += sizeof (Elf32_External_Rela);
2809 }
2810 else
2811 *local_got = (bfd_vma) -1;
2812 ++local_tls_type;
2813 }
2814 }
2815
2816 if (htab->tls_ldm_got.refcount > 0)
2817 {
2818 /* Allocate 2 got entries and 1 dynamic reloc for R_METAG_TLS_LDM
2819 reloc. */
2820 htab->tls_ldm_got.offset = htab->etab.sgot->size;
2821 htab->etab.sgot->size += 8;
2822 htab->etab.srelgot->size += sizeof (Elf32_External_Rela);
2823 }
2824 else
2825 htab->tls_ldm_got.offset = -1;
2826
2827 /* Allocate global sym .plt and .got entries, and space for global
2828 sym dynamic relocs. */
2829 elf_link_hash_traverse (&htab->etab, allocate_dynrelocs, info);
2830
2831 /* We now have determined the sizes of the various dynamic sections.
2832 Allocate memory for them. */
2833 relocs = false;
2834 for (s = dynobj->sections; s != NULL; s = s->next)
2835 {
2836 bool reloc_section = false;
2837
2838 if ((s->flags & SEC_LINKER_CREATED) == 0)
2839 continue;
2840
2841 if (s == htab->etab.splt
2842 || s == htab->etab.sgot
2843 || s == htab->etab.sgotplt
2844 || s == htab->etab.sdynbss
2845 || s == htab->etab.sdynrelro)
2846 {
2847 /* Strip this section if we don't need it; see the
2848 comment below. */
2849 }
2850 else if (startswith (bfd_section_name (s), ".rela"))
2851 {
2852 if (s->size != 0 && s != htab->etab.srelplt)
2853 relocs = true;
2854
2855 /* We use the reloc_count field as a counter if we need
2856 to copy relocs into the output file. */
2857 s->reloc_count = 0;
2858 reloc_section = true;
2859 }
2860 else
2861 {
2862 /* It's not one of our sections, so don't allocate space. */
2863 continue;
2864 }
2865
2866 if (s->size == 0)
2867 {
2868 /* If we don't need this section, strip it from the
2869 output file. This is mostly to handle .rela.bss and
2870 .rela.plt. We must create both sections in
2871 create_dynamic_sections, because they must be created
2872 before the linker maps input sections to output
2873 sections. The linker does that before
2874 adjust_dynamic_symbol is called, and it is that
2875 function which decides whether anything needs to go
2876 into these sections. */
2877 s->flags |= SEC_EXCLUDE;
2878 continue;
2879 }
2880
2881 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2882 continue;
2883
2884 /* Allocate memory for the section contents. */
2885 s->contents = bfd_zalloc (dynobj, s->size);
2886 if (s->contents == NULL)
2887 return false;
2888 else if (reloc_section)
2889 {
2890 unsigned char *contents = s->contents;
2891 Elf32_External_Rela reloc;
2892
2893 /* Fill the reloc section with a R_METAG_NONE type reloc. */
2894 memset(&reloc, 0, sizeof(Elf32_External_Rela));
2895 reloc.r_info[0] = R_METAG_NONE;
2896 for (; contents < (s->contents + s->size);
2897 contents += sizeof(Elf32_External_Rela))
2898 {
2899 memcpy(contents, &reloc, sizeof(Elf32_External_Rela));
2900 }
2901 }
2902 }
2903
2904 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
2905 }
2906
2907 /* Finish up dynamic symbol handling. We set the contents of various
2908 dynamic sections here. */
2909
2910 static bool
elf_metag_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * eh,Elf_Internal_Sym * sym)2911 elf_metag_finish_dynamic_symbol (bfd *output_bfd,
2912 struct bfd_link_info *info,
2913 struct elf_link_hash_entry *eh,
2914 Elf_Internal_Sym *sym)
2915 {
2916 struct elf_metag_link_hash_table *htab;
2917 Elf_Internal_Rela rel;
2918 bfd_byte *loc;
2919
2920 htab = metag_link_hash_table (info);
2921
2922 if (eh->plt.offset != (bfd_vma) -1)
2923 {
2924 asection *splt;
2925 asection *sgot;
2926 asection *srela;
2927
2928 bfd_vma plt_index;
2929 bfd_vma got_offset;
2930 bfd_vma got_entry;
2931
2932 if (eh->plt.offset & 1)
2933 abort ();
2934
2935 BFD_ASSERT (eh->dynindx != -1);
2936
2937 splt = htab->etab.splt;
2938 sgot = htab->etab.sgotplt;
2939 srela = htab->etab.srelplt;
2940 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
2941
2942 /* Get the index in the procedure linkage table which
2943 corresponds to this symbol. This is the index of this symbol
2944 in all the symbols for which we are making plt entries. The
2945 first entry in the procedure linkage table is reserved. */
2946 plt_index = eh->plt.offset / PLT_ENTRY_SIZE - 1;
2947
2948 /* Get the offset into the .got.plt table of the entry that
2949 corresponds to this function. */
2950 got_offset = plt_index * GOT_ENTRY_SIZE;
2951
2952 BFD_ASSERT (got_offset < (1 << 16));
2953
2954 got_entry = sgot->output_section->vma
2955 + sgot->output_offset
2956 + got_offset;
2957
2958 BFD_ASSERT (plt_index < (1 << 16));
2959
2960 /* Fill in the entry in the procedure linkage table. */
2961 if (! bfd_link_pic (info))
2962 {
2963 bfd_put_32 (output_bfd,
2964 (plt_entry[0]
2965 | (((got_entry >> 16) & 0xffff) << 3)),
2966 splt->contents + eh->plt.offset);
2967 bfd_put_32 (output_bfd,
2968 (plt_entry[1]
2969 | ((got_entry & 0xffff) << 3)),
2970 splt->contents + eh->plt.offset + 4);
2971 bfd_put_32 (output_bfd, plt_entry[2],
2972 splt->contents + eh->plt.offset + 8);
2973 bfd_put_32 (output_bfd,
2974 (plt_entry[3] | (plt_index << 3)),
2975 splt->contents + eh->plt.offset + 12);
2976 bfd_put_32 (output_bfd,
2977 (plt_entry[4]
2978 | ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)),
2979 splt->contents + eh->plt.offset + 16);
2980 }
2981 else
2982 {
2983 bfd_vma addr = got_entry - (splt->output_section->vma +
2984 splt->output_offset + eh->plt.offset);
2985
2986 bfd_put_32 (output_bfd,
2987 plt_pic_entry[0] | (((addr >> 16) & 0xffff) << 3),
2988 splt->contents + eh->plt.offset);
2989 bfd_put_32 (output_bfd,
2990 plt_pic_entry[1] | ((addr & 0xffff) << 3),
2991 splt->contents + eh->plt.offset + 4);
2992 bfd_put_32 (output_bfd, plt_pic_entry[2],
2993 splt->contents + eh->plt.offset + 8);
2994 bfd_put_32 (output_bfd,
2995 (plt_pic_entry[3] | (plt_index << 3)),
2996 splt->contents + eh->plt.offset + 12);
2997 bfd_put_32 (output_bfd,
2998 (plt_pic_entry[4]
2999 + ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)),
3000 splt->contents + eh->plt.offset + 16);
3001 }
3002
3003 /* Fill in the entry in the global offset table. */
3004 bfd_put_32 (output_bfd,
3005 (splt->output_section->vma
3006 + splt->output_offset
3007 + eh->plt.offset
3008 + 12), /* offset within PLT entry */
3009 sgot->contents + got_offset);
3010
3011 /* Fill in the entry in the .rela.plt section. */
3012 rel.r_offset = (sgot->output_section->vma
3013 + sgot->output_offset
3014 + got_offset);
3015 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_JMP_SLOT);
3016 rel.r_addend = 0;
3017 loc = htab->etab.srelplt->contents;
3018 loc += plt_index * sizeof(Elf32_External_Rela);
3019 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
3020
3021 if (!eh->def_regular)
3022 {
3023 /* Mark the symbol as undefined, rather than as defined in
3024 the .plt section. Leave the value alone. */
3025 sym->st_shndx = SHN_UNDEF;
3026 }
3027 }
3028
3029 if (eh->got.offset != (bfd_vma) -1
3030 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_GD) == 0
3031 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_IE) == 0)
3032 {
3033 /* This symbol has an entry in the global offset table. Set it
3034 up. */
3035
3036 rel.r_offset = ((eh->got.offset &~ (bfd_vma) 1)
3037 + htab->etab.sgot->output_offset
3038 + htab->etab.sgot->output_section->vma);
3039
3040 /* If this is a -Bsymbolic link and the symbol is defined
3041 locally or was forced to be local because of a version file,
3042 we just want to emit a RELATIVE reloc. The entry in the
3043 global offset table will already have been initialized in the
3044 relocate_section function. */
3045 if (bfd_link_pic (info)
3046 && (info->symbolic || eh->dynindx == -1)
3047 && eh->def_regular)
3048 {
3049 rel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE);
3050 rel.r_addend = (eh->root.u.def.value
3051 + eh->root.u.def.section->output_offset
3052 + eh->root.u.def.section->output_section->vma);
3053 }
3054 else
3055 {
3056 if ((eh->got.offset & 1) != 0)
3057 abort ();
3058 bfd_put_32 (output_bfd, 0, htab->etab.sgot->contents + eh->got.offset);
3059 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_GLOB_DAT);
3060 rel.r_addend = 0;
3061 }
3062
3063 loc = htab->etab.srelgot->contents;
3064 loc += htab->etab.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3065 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
3066 }
3067
3068 if (eh->needs_copy)
3069 {
3070 asection *s;
3071
3072 /* This symbol needs a copy reloc. Set it up. */
3073
3074 if (! (eh->dynindx != -1
3075 && (eh->root.type == bfd_link_hash_defined
3076 || eh->root.type == bfd_link_hash_defweak)))
3077 abort ();
3078
3079 rel.r_offset = (eh->root.u.def.value
3080 + eh->root.u.def.section->output_offset
3081 + eh->root.u.def.section->output_section->vma);
3082 rel.r_addend = 0;
3083 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_COPY);
3084 if (eh->root.u.def.section == htab->etab.sdynrelro)
3085 s = htab->etab.sreldynrelro;
3086 else
3087 s = htab->etab.srelbss;
3088 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
3089 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
3090 }
3091
3092 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3093 if (eh->root.root.string[0] == '_'
3094 && (strcmp (eh->root.root.string, "_DYNAMIC") == 0
3095 || eh == htab->etab.hgot))
3096 {
3097 sym->st_shndx = SHN_ABS;
3098 }
3099
3100 return true;
3101 }
3102
3103 /* Set the Meta ELF ABI version. */
3104
3105 static bool
elf_metag_init_file_header(bfd * abfd,struct bfd_link_info * link_info)3106 elf_metag_init_file_header (bfd *abfd, struct bfd_link_info *link_info)
3107 {
3108 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
3109
3110 if (!_bfd_elf_init_file_header (abfd, link_info))
3111 return false;
3112
3113 i_ehdrp = elf_elfheader (abfd);
3114 i_ehdrp->e_ident[EI_ABIVERSION] = METAG_ELF_ABI_VERSION;
3115 return true;
3116 }
3117
3118 /* Used to decide how to sort relocs in an optimal manner for the
3119 dynamic linker, before writing them out. */
3120
3121 static enum elf_reloc_type_class
elf_metag_reloc_type_class(const struct bfd_link_info * info ATTRIBUTE_UNUSED,const asection * rel_sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * rela)3122 elf_metag_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3123 const asection *rel_sec ATTRIBUTE_UNUSED,
3124 const Elf_Internal_Rela *rela)
3125 {
3126 switch ((int) ELF32_R_TYPE (rela->r_info))
3127 {
3128 case R_METAG_RELATIVE:
3129 return reloc_class_relative;
3130 case R_METAG_JMP_SLOT:
3131 return reloc_class_plt;
3132 case R_METAG_COPY:
3133 return reloc_class_copy;
3134 default:
3135 return reloc_class_normal;
3136 }
3137 }
3138
3139 /* Finish up the dynamic sections. */
3140
3141 static bool
elf_metag_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3142 elf_metag_finish_dynamic_sections (bfd *output_bfd,
3143 struct bfd_link_info *info)
3144 {
3145 bfd *dynobj;
3146 struct elf_metag_link_hash_table *htab;
3147 asection *sdyn;
3148
3149 htab = metag_link_hash_table (info);
3150 dynobj = htab->etab.dynobj;
3151
3152 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3153
3154 if (htab->etab.dynamic_sections_created)
3155 {
3156 asection *splt;
3157 Elf32_External_Dyn *dyncon, *dynconend;
3158
3159 if (sdyn == NULL)
3160 abort ();
3161
3162 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3163 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3164 for (; dyncon < dynconend; dyncon++)
3165 {
3166 Elf_Internal_Dyn dyn;
3167 asection *s;
3168
3169 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3170
3171 switch (dyn.d_tag)
3172 {
3173 default:
3174 continue;
3175
3176 case DT_PLTGOT:
3177 s = htab->etab.sgot;
3178 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3179 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3180 break;
3181
3182 case DT_JMPREL:
3183 s = htab->etab.srelplt;
3184 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3185 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3186 break;
3187
3188 case DT_PLTRELSZ:
3189 s = htab->etab.srelplt;
3190 dyn.d_un.d_val = s->size;
3191 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3192 break;
3193 }
3194
3195 }
3196
3197 /* Fill in the first entry in the procedure linkage table. */
3198 splt = htab->etab.splt;
3199 if (splt && splt->size > 0)
3200 {
3201 unsigned long addr;
3202 /* addr = .got + 4 */
3203 addr = (htab->etab.sgot->output_section->vma
3204 + htab->etab.sgot->output_offset + 4);
3205 if (bfd_link_pic (info))
3206 {
3207 addr -= splt->output_section->vma + splt->output_offset;
3208 bfd_put_32 (output_bfd,
3209 plt0_pic_entry[0] | (((addr >> 16) & 0xffff) << 3),
3210 splt->contents);
3211 bfd_put_32 (output_bfd,
3212 plt0_pic_entry[1] | ((addr & 0xffff) << 3),
3213 splt->contents + 4);
3214 bfd_put_32 (output_bfd, plt0_pic_entry[2], splt->contents + 8);
3215 bfd_put_32 (output_bfd, plt0_pic_entry[3], splt->contents + 12);
3216 bfd_put_32 (output_bfd, plt0_pic_entry[4], splt->contents + 16);
3217 }
3218 else
3219 {
3220 bfd_put_32 (output_bfd,
3221 plt0_entry[0] | (((addr >> 16) & 0xffff) << 3),
3222 splt->contents);
3223 bfd_put_32 (output_bfd,
3224 plt0_entry[1] | ((addr & 0xffff) << 3),
3225 splt->contents + 4);
3226 bfd_put_32 (output_bfd, plt0_entry[2], splt->contents + 8);
3227 bfd_put_32 (output_bfd, plt0_entry[3], splt->contents + 12);
3228 bfd_put_32 (output_bfd, plt0_entry[4], splt->contents + 16);
3229 }
3230
3231 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
3232 PLT_ENTRY_SIZE;
3233 }
3234 }
3235
3236 if (htab->etab.sgot != NULL && htab->etab.sgot->size != 0)
3237 {
3238 /* Fill in the first entry in the global offset table.
3239 We use it to point to our dynamic section, if we have one. */
3240 bfd_put_32 (output_bfd,
3241 sdyn ? sdyn->output_section->vma + sdyn->output_offset : 0,
3242 htab->etab.sgot->contents);
3243
3244 /* The second entry is reserved for use by the dynamic linker. */
3245 memset (htab->etab.sgot->contents + GOT_ENTRY_SIZE, 0, GOT_ENTRY_SIZE);
3246
3247 /* Set .got entry size. */
3248 elf_section_data (htab->etab.sgot->output_section)
3249 ->this_hdr.sh_entsize = GOT_ENTRY_SIZE;
3250 }
3251
3252 return true;
3253 }
3254
3255 /* Return the section that should be marked against GC for a given
3256 relocation. */
3257
3258 static asection *
elf_metag_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rela,struct elf_link_hash_entry * hh,Elf_Internal_Sym * sym)3259 elf_metag_gc_mark_hook (asection *sec,
3260 struct bfd_link_info *info,
3261 Elf_Internal_Rela *rela,
3262 struct elf_link_hash_entry *hh,
3263 Elf_Internal_Sym *sym)
3264 {
3265 if (hh != NULL)
3266 switch ((unsigned int) ELF32_R_TYPE (rela->r_info))
3267 {
3268 case R_METAG_GNU_VTINHERIT:
3269 case R_METAG_GNU_VTENTRY:
3270 return NULL;
3271 }
3272
3273 return _bfd_elf_gc_mark_hook (sec, info, rela, hh, sym);
3274 }
3275
3276 /* Determine the type of stub needed, if any, for a call. */
3277
3278 static enum elf_metag_stub_type
metag_type_of_stub(asection * input_sec,const Elf_Internal_Rela * rel,struct elf_metag_link_hash_entry * hh,bfd_vma destination,struct bfd_link_info * info ATTRIBUTE_UNUSED)3279 metag_type_of_stub (asection *input_sec,
3280 const Elf_Internal_Rela *rel,
3281 struct elf_metag_link_hash_entry *hh,
3282 bfd_vma destination,
3283 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3284 {
3285 bfd_vma location;
3286 bfd_vma branch_offset;
3287 bfd_vma max_branch_offset;
3288
3289 if (hh != NULL &&
3290 !(hh->eh.root.type == bfd_link_hash_defined
3291 || hh->eh.root.type == bfd_link_hash_defweak))
3292 return metag_stub_none;
3293
3294 /* Determine where the call point is. */
3295 location = (input_sec->output_offset
3296 + input_sec->output_section->vma
3297 + rel->r_offset);
3298
3299 branch_offset = destination - location;
3300
3301 /* Determine if a long branch stub is needed. Meta branch offsets
3302 are signed 19 bits 4 byte aligned. */
3303 max_branch_offset = (1 << (BRANCH_BITS-1)) << 2;
3304
3305 if (branch_offset + max_branch_offset >= 2*max_branch_offset)
3306 {
3307 if (bfd_link_pic (info))
3308 return metag_stub_long_branch_shared;
3309 else
3310 return metag_stub_long_branch;
3311 }
3312
3313 return metag_stub_none;
3314 }
3315
3316 #define MOVT_A0_3 0x82180005
3317 #define JUMP_A0_3 0xac180003
3318
3319 #define MOVT_A1LBP 0x83080005
3320 #define ADD_A1LBP 0x83080000
3321
3322 #define ADDT_A0_3_CPC 0x82980001
3323 #define ADD_A0_3_A0_3 0x82180000
3324 #define MOV_PC_A0_3 0xa3180ca0
3325
3326 static bool
metag_build_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg)3327 metag_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
3328 {
3329 struct elf_metag_stub_hash_entry *hsh;
3330 asection *stub_sec;
3331 bfd *stub_bfd;
3332 bfd_byte *loc;
3333 bfd_vma sym_value;
3334 int size;
3335 struct bfd_link_info *info;
3336
3337 /* Massage our args to the form they really have. */
3338 hsh = (struct elf_metag_stub_hash_entry *) gen_entry;
3339 info = (struct bfd_link_info *) in_arg;
3340
3341 /* Fail if the target section could not be assigned to an output
3342 section. The user should fix his linker script. */
3343 if (hsh->target_section->output_section == NULL
3344 && info->non_contiguous_regions)
3345 info->callbacks->einfo (_("%F%P: Could not assign '%pA' to an output section. "
3346 "Retry without --enable-non-contiguous-regions.\n"),
3347 hsh->target_section);
3348
3349 stub_sec = hsh->stub_sec;
3350
3351 /* Make a note of the offset within the stubs for this entry. */
3352 hsh->stub_offset = stub_sec->size;
3353 loc = stub_sec->contents + hsh->stub_offset;
3354
3355 stub_bfd = stub_sec->owner;
3356
3357 switch (hsh->stub_type)
3358 {
3359 case metag_stub_long_branch_shared:
3360 /* A PIC long branch stub is an ADDT and an ADD instruction used to
3361 calculate the jump target using A0.3 as a temporary. Then a MOV
3362 to PC carries out the jump. */
3363 sym_value = (hsh->target_value
3364 + hsh->target_section->output_offset
3365 + hsh->target_section->output_section->vma
3366 + hsh->addend);
3367
3368 sym_value -= (hsh->stub_offset
3369 + stub_sec->output_offset
3370 + stub_sec->output_section->vma);
3371
3372 bfd_put_32 (stub_bfd, ADDT_A0_3_CPC | (((sym_value >> 16) & 0xffff) << 3),
3373 loc);
3374
3375 bfd_put_32 (stub_bfd, ADD_A0_3_A0_3 | ((sym_value & 0xffff) << 3),
3376 loc + 4);
3377
3378 bfd_put_32 (stub_bfd, MOV_PC_A0_3, loc + 8);
3379
3380 size = 12;
3381 break;
3382 case metag_stub_long_branch:
3383 /* A standard long branch stub is a MOVT instruction followed by a
3384 JUMP instruction using the A0.3 register as a temporary. This is
3385 the same method used by the LDLK linker (patch.c). */
3386 sym_value = (hsh->target_value
3387 + hsh->target_section->output_offset
3388 + hsh->target_section->output_section->vma
3389 + hsh->addend);
3390
3391 bfd_put_32 (stub_bfd, MOVT_A0_3 | (((sym_value >> 16) & 0xffff) << 3),
3392 loc);
3393
3394 bfd_put_32 (stub_bfd, JUMP_A0_3 | ((sym_value & 0xffff) << 3), loc + 4);
3395
3396 size = 8;
3397 break;
3398 default:
3399 BFD_FAIL ();
3400 return false;
3401 }
3402
3403 stub_sec->size += size;
3404 return true;
3405 }
3406
3407 /* As above, but don't actually build the stub. Just bump offset so
3408 we know stub section sizes. */
3409
3410 static bool
metag_size_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg ATTRIBUTE_UNUSED)3411 metag_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
3412 {
3413 struct elf_metag_stub_hash_entry *hsh;
3414 int size = 0;
3415
3416 /* Massage our args to the form they really have. */
3417 hsh = (struct elf_metag_stub_hash_entry *) gen_entry;
3418
3419 if (hsh->stub_type == metag_stub_long_branch)
3420 size = 8;
3421 else if (hsh->stub_type == metag_stub_long_branch_shared)
3422 size = 12;
3423
3424 hsh->stub_sec->size += size;
3425 return true;
3426 }
3427
3428 /* Set up various things so that we can make a list of input sections
3429 for each output section included in the link. Returns -1 on error,
3430 0 when no stubs will be needed, and 1 on success. */
3431
3432 int
elf_metag_setup_section_lists(bfd * output_bfd,struct bfd_link_info * info)3433 elf_metag_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info)
3434 {
3435 bfd *input_bfd;
3436 unsigned int bfd_count;
3437 unsigned int top_id, top_index;
3438 asection *section;
3439 asection **input_list, **list;
3440 size_t amt;
3441 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3442
3443 /* Count the number of input BFDs and find the top input section id. */
3444 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
3445 input_bfd != NULL;
3446 input_bfd = input_bfd->link.next)
3447 {
3448 bfd_count += 1;
3449 for (section = input_bfd->sections;
3450 section != NULL;
3451 section = section->next)
3452 {
3453 if (top_id < section->id)
3454 top_id = section->id;
3455 }
3456 }
3457
3458 htab->bfd_count = bfd_count;
3459
3460 amt = sizeof (struct map_stub) * (top_id + 1);
3461 htab->stub_group = bfd_zmalloc (amt);
3462 if (htab->stub_group == NULL)
3463 return -1;
3464
3465 /* We can't use output_bfd->section_count here to find the top output
3466 section index as some sections may have been removed, and
3467 strip_excluded_output_sections doesn't renumber the indices. */
3468 for (section = output_bfd->sections, top_index = 0;
3469 section != NULL;
3470 section = section->next)
3471 {
3472 if (top_index < section->index)
3473 top_index = section->index;
3474 }
3475
3476 htab->top_index = top_index;
3477 amt = sizeof (asection *) * (top_index + 1);
3478 input_list = bfd_malloc (amt);
3479 htab->input_list = input_list;
3480 if (input_list == NULL)
3481 return -1;
3482
3483 /* For sections we aren't interested in, mark their entries with a
3484 value we can check later. */
3485 list = input_list + top_index;
3486 do
3487 *list = bfd_abs_section_ptr;
3488 while (list-- != input_list);
3489
3490 for (section = output_bfd->sections;
3491 section != NULL;
3492 section = section->next)
3493 {
3494 /* FIXME: This is a bit of hack. Currently our .ctors and .dtors
3495 * have PC relative relocs in them but no code flag set. */
3496 if (((section->flags & SEC_CODE) != 0) ||
3497 strcmp(".ctors", section->name) ||
3498 strcmp(".dtors", section->name))
3499 input_list[section->index] = NULL;
3500 }
3501
3502 return 1;
3503 }
3504
3505 /* The linker repeatedly calls this function for each input section,
3506 in the order that input sections are linked into output sections.
3507 Build lists of input sections to determine groupings between which
3508 we may insert linker stubs. */
3509
3510 void
elf_metag_next_input_section(struct bfd_link_info * info,asection * isec)3511 elf_metag_next_input_section (struct bfd_link_info *info, asection *isec)
3512 {
3513 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3514
3515 if (isec->output_section->index <= htab->top_index)
3516 {
3517 asection **list = htab->input_list + isec->output_section->index;
3518 if (*list != bfd_abs_section_ptr)
3519 {
3520 /* Steal the link_sec pointer for our list. */
3521 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec)
3522 /* This happens to make the list in reverse order,
3523 which is what we want. */
3524 PREV_SEC (isec) = *list;
3525 *list = isec;
3526 }
3527 }
3528 }
3529
3530 /* See whether we can group stub sections together. Grouping stub
3531 sections may result in fewer stubs. More importantly, we need to
3532 put all .init* and .fini* stubs at the beginning of the .init or
3533 .fini output sections respectively, because glibc splits the
3534 _init and _fini functions into multiple parts. Putting a stub in
3535 the middle of a function is not a good idea. */
3536
3537 static void
group_sections(struct elf_metag_link_hash_table * htab,bfd_size_type stub_group_size,bool stubs_always_before_branch)3538 group_sections (struct elf_metag_link_hash_table *htab,
3539 bfd_size_type stub_group_size,
3540 bool stubs_always_before_branch)
3541 {
3542 asection **list = htab->input_list + htab->top_index;
3543 do
3544 {
3545 asection *tail = *list;
3546 if (tail == bfd_abs_section_ptr)
3547 continue;
3548 while (tail != NULL)
3549 {
3550 asection *curr;
3551 asection *prev;
3552 bfd_size_type total;
3553 bool big_sec;
3554
3555 curr = tail;
3556 total = tail->size;
3557 big_sec = total >= stub_group_size;
3558
3559 while ((prev = PREV_SEC (curr)) != NULL
3560 && ((total += curr->output_offset - prev->output_offset)
3561 < stub_group_size))
3562 curr = prev;
3563
3564 /* OK, the size from the start of CURR to the end is less
3565 than stub_group_size bytes and thus can be handled by one stub
3566 section. (or the tail section is itself larger than
3567 stub_group_size bytes, in which case we may be toast.)
3568 We should really be keeping track of the total size of
3569 stubs added here, as stubs contribute to the final output
3570 section size. */
3571 do
3572 {
3573 prev = PREV_SEC (tail);
3574 /* Set up this stub group. */
3575 htab->stub_group[tail->id].link_sec = curr;
3576 }
3577 while (tail != curr && (tail = prev) != NULL);
3578
3579 /* But wait, there's more! Input sections up to stub_group_size
3580 bytes before the stub section can be handled by it too.
3581 Don't do this if we have a really large section after the
3582 stubs, as adding more stubs increases the chance that
3583 branches may not reach into the stub section. */
3584 if (!stubs_always_before_branch && !big_sec)
3585 {
3586 total = 0;
3587 while (prev != NULL
3588 && ((total += tail->output_offset - prev->output_offset)
3589 < stub_group_size))
3590 {
3591 tail = prev;
3592 prev = PREV_SEC (tail);
3593 htab->stub_group[tail->id].link_sec = curr;
3594 }
3595 }
3596 tail = prev;
3597 }
3598 }
3599 while (list-- != htab->input_list);
3600 free (htab->input_list);
3601 #undef PREV_SEC
3602 }
3603
3604 /* Read in all local syms for all input bfds.
3605 Returns -1 on error, 0 otherwise. */
3606
3607 static int
get_local_syms(bfd * output_bfd ATTRIBUTE_UNUSED,bfd * input_bfd,struct bfd_link_info * info)3608 get_local_syms (bfd *output_bfd ATTRIBUTE_UNUSED, bfd *input_bfd,
3609 struct bfd_link_info *info)
3610 {
3611 unsigned int bfd_indx;
3612 Elf_Internal_Sym *local_syms, **all_local_syms;
3613 int stub_changed = 0;
3614 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3615
3616 /* We want to read in symbol extension records only once. To do this
3617 we need to read in the local symbols in parallel and save them for
3618 later use; so hold pointers to the local symbols in an array. */
3619 size_t amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
3620 all_local_syms = bfd_zmalloc (amt);
3621 htab->all_local_syms = all_local_syms;
3622 if (all_local_syms == NULL)
3623 return -1;
3624
3625 /* Walk over all the input BFDs, swapping in local symbols. */
3626 for (bfd_indx = 0;
3627 input_bfd != NULL;
3628 input_bfd = input_bfd->link.next, bfd_indx++)
3629 {
3630 Elf_Internal_Shdr *symtab_hdr;
3631
3632 /* We'll need the symbol table in a second. */
3633 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3634 if (symtab_hdr->sh_info == 0)
3635 continue;
3636
3637 /* We need an array of the local symbols attached to the input bfd. */
3638 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
3639 if (local_syms == NULL)
3640 {
3641 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3642 symtab_hdr->sh_info, 0,
3643 NULL, NULL, NULL);
3644 /* Cache them for elf_link_input_bfd. */
3645 symtab_hdr->contents = (unsigned char *) local_syms;
3646 }
3647 if (local_syms == NULL)
3648 return -1;
3649
3650 all_local_syms[bfd_indx] = local_syms;
3651 }
3652
3653 return stub_changed;
3654 }
3655
3656 /* Determine and set the size of the stub section for a final link.
3657
3658 The basic idea here is to examine all the relocations looking for
3659 PC-relative calls to a target that is unreachable with a "CALLR"
3660 instruction. */
3661
3662 /* See elf32-hppa.c and elf64-ppc.c. */
3663
3664 bool
elf_metag_size_stubs(bfd * output_bfd,bfd * stub_bfd,struct bfd_link_info * info,bfd_signed_vma group_size,asection * (* add_stub_section)(const char *,asection *),void (* layout_sections_again)(void))3665 elf_metag_size_stubs(bfd *output_bfd, bfd *stub_bfd,
3666 struct bfd_link_info *info,
3667 bfd_signed_vma group_size,
3668 asection * (*add_stub_section) (const char *, asection *),
3669 void (*layout_sections_again) (void))
3670 {
3671 bfd_size_type stub_group_size;
3672 bool stubs_always_before_branch;
3673 bool stub_changed;
3674 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3675
3676 /* Stash our params away. */
3677 htab->stub_bfd = stub_bfd;
3678 htab->add_stub_section = add_stub_section;
3679 htab->layout_sections_again = layout_sections_again;
3680 stubs_always_before_branch = group_size < 0;
3681 if (group_size < 0)
3682 stub_group_size = -group_size;
3683 else
3684 stub_group_size = group_size;
3685 if (stub_group_size == 1)
3686 {
3687 /* Default values. */
3688 /* FIXME: not sure what these values should be */
3689 if (stubs_always_before_branch)
3690 {
3691 stub_group_size = (1 << BRANCH_BITS);
3692 }
3693 else
3694 {
3695 stub_group_size = (1 << BRANCH_BITS);
3696 }
3697 }
3698
3699 group_sections (htab, stub_group_size, stubs_always_before_branch);
3700
3701 switch (get_local_syms (output_bfd, info->input_bfds, info))
3702 {
3703 default:
3704 if (htab->all_local_syms)
3705 goto error_ret_free_local;
3706 return false;
3707
3708 case 0:
3709 stub_changed = false;
3710 break;
3711
3712 case 1:
3713 stub_changed = true;
3714 break;
3715 }
3716
3717 while (1)
3718 {
3719 bfd *input_bfd;
3720 unsigned int bfd_indx;
3721 asection *stub_sec;
3722
3723 for (input_bfd = info->input_bfds, bfd_indx = 0;
3724 input_bfd != NULL;
3725 input_bfd = input_bfd->link.next, bfd_indx++)
3726 {
3727 Elf_Internal_Shdr *symtab_hdr;
3728 asection *section;
3729 Elf_Internal_Sym *local_syms;
3730
3731 /* We'll need the symbol table in a second. */
3732 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3733 if (symtab_hdr->sh_info == 0)
3734 continue;
3735
3736 local_syms = htab->all_local_syms[bfd_indx];
3737
3738 /* Walk over each section attached to the input bfd. */
3739 for (section = input_bfd->sections;
3740 section != NULL;
3741 section = section->next)
3742 {
3743 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
3744
3745 /* If there aren't any relocs, then there's nothing more
3746 to do. */
3747 if ((section->flags & SEC_RELOC) == 0
3748 || section->reloc_count == 0)
3749 continue;
3750
3751 /* If this section is a link-once section that will be
3752 discarded, then don't create any stubs. */
3753 if (section->output_section == NULL
3754 || section->output_section->owner != output_bfd)
3755 continue;
3756
3757 /* Get the relocs. */
3758 internal_relocs
3759 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
3760 info->keep_memory);
3761 if (internal_relocs == NULL)
3762 goto error_ret_free_local;
3763
3764 /* Now examine each relocation. */
3765 irela = internal_relocs;
3766 irelaend = irela + section->reloc_count;
3767 for (; irela < irelaend; irela++)
3768 {
3769 unsigned int r_type, r_indx;
3770 enum elf_metag_stub_type stub_type;
3771 struct elf_metag_stub_hash_entry *hsh;
3772 asection *sym_sec;
3773 bfd_vma sym_value;
3774 bfd_vma destination;
3775 struct elf_metag_link_hash_entry *hh;
3776 char *stub_name;
3777 const asection *id_sec;
3778
3779 r_type = ELF32_R_TYPE (irela->r_info);
3780 r_indx = ELF32_R_SYM (irela->r_info);
3781
3782 if (r_type >= (unsigned int) R_METAG_MAX)
3783 {
3784 bfd_set_error (bfd_error_bad_value);
3785 error_ret_free_internal:
3786 if (elf_section_data (section)->relocs == NULL)
3787 free (internal_relocs);
3788 goto error_ret_free_local;
3789 }
3790
3791 /* Only look for stubs on CALLR and B instructions. */
3792 if (!(r_type == (unsigned int) R_METAG_RELBRANCH ||
3793 r_type == (unsigned int) R_METAG_RELBRANCH_PLT))
3794 continue;
3795
3796 /* Now determine the call target, its name, value,
3797 section. */
3798 sym_sec = NULL;
3799 sym_value = 0;
3800 destination = 0;
3801 hh = NULL;
3802 if (r_indx < symtab_hdr->sh_info)
3803 {
3804 /* It's a local symbol. */
3805 Elf_Internal_Sym *sym;
3806 Elf_Internal_Shdr *hdr;
3807 unsigned int shndx;
3808
3809 sym = local_syms + r_indx;
3810 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
3811 sym_value = sym->st_value;
3812 shndx = sym->st_shndx;
3813 if (shndx < elf_numsections (input_bfd))
3814 {
3815 hdr = elf_elfsections (input_bfd)[shndx];
3816 sym_sec = hdr->bfd_section;
3817 destination = (sym_value + irela->r_addend
3818 + sym_sec->output_offset
3819 + sym_sec->output_section->vma);
3820 }
3821 }
3822 else
3823 {
3824 /* It's an external symbol. */
3825 int e_indx;
3826
3827 e_indx = r_indx - symtab_hdr->sh_info;
3828 hh = ((struct elf_metag_link_hash_entry *)
3829 elf_sym_hashes (input_bfd)[e_indx]);
3830
3831 while (hh->eh.root.type == bfd_link_hash_indirect
3832 || hh->eh.root.type == bfd_link_hash_warning)
3833 hh = ((struct elf_metag_link_hash_entry *)
3834 hh->eh.root.u.i.link);
3835
3836 if (hh->eh.root.type == bfd_link_hash_defined
3837 || hh->eh.root.type == bfd_link_hash_defweak)
3838 {
3839 sym_sec = hh->eh.root.u.def.section;
3840 sym_value = hh->eh.root.u.def.value;
3841 if (hh->eh.plt.offset != (bfd_vma) -1
3842 && hh->eh.dynindx != -1
3843 && r_type == (unsigned int) R_METAG_RELBRANCH_PLT)
3844 {
3845 sym_sec = htab->etab.splt;
3846 sym_value = hh->eh.plt.offset;
3847 }
3848
3849 if (sym_sec->output_section != NULL)
3850 destination = (sym_value + irela->r_addend
3851 + sym_sec->output_offset
3852 + sym_sec->output_section->vma);
3853 else
3854 continue;
3855 }
3856 else if (hh->eh.root.type == bfd_link_hash_undefweak)
3857 {
3858 if (! bfd_link_pic (info))
3859 continue;
3860 }
3861 else if (hh->eh.root.type == bfd_link_hash_undefined)
3862 {
3863 if (! (info->unresolved_syms_in_objects == RM_IGNORE
3864 && (ELF_ST_VISIBILITY (hh->eh.other)
3865 == STV_DEFAULT)))
3866 continue;
3867 }
3868 else
3869 {
3870 bfd_set_error (bfd_error_bad_value);
3871 goto error_ret_free_internal;
3872 }
3873 }
3874
3875 /* Determine what (if any) linker stub is needed. */
3876 stub_type = metag_type_of_stub (section, irela, hh,
3877 destination, info);
3878 if (stub_type == metag_stub_none)
3879 continue;
3880
3881 /* Support for grouping stub sections. */
3882 id_sec = htab->stub_group[section->id].link_sec;
3883
3884 /* Get the name of this stub. */
3885 stub_name = metag_stub_name (id_sec, sym_sec, hh, irela);
3886 if (!stub_name)
3887 goto error_ret_free_internal;
3888
3889 hsh = metag_stub_hash_lookup (&htab->bstab,
3890 stub_name,
3891 false, false);
3892 if (hsh != NULL)
3893 {
3894 /* The proper stub has already been created. */
3895 free (stub_name);
3896 continue;
3897 }
3898
3899 hsh = metag_add_stub (stub_name, section, htab);
3900 if (hsh == NULL)
3901 {
3902 free (stub_name);
3903 goto error_ret_free_internal;
3904 }
3905 hsh->target_value = sym_value;
3906 hsh->target_section = sym_sec;
3907 hsh->stub_type = stub_type;
3908 hsh->hh = hh;
3909 hsh->addend = irela->r_addend;
3910 stub_changed = true;
3911 }
3912
3913 /* We're done with the internal relocs, free them. */
3914 if (elf_section_data (section)->relocs == NULL)
3915 free (internal_relocs);
3916 }
3917 }
3918
3919 if (!stub_changed)
3920 break;
3921
3922 /* OK, we've added some stubs. Find out the new size of the
3923 stub sections. */
3924 for (stub_sec = htab->stub_bfd->sections;
3925 stub_sec != NULL;
3926 stub_sec = stub_sec->next)
3927 stub_sec->size = 0;
3928
3929 bfd_hash_traverse (&htab->bstab, metag_size_one_stub, htab);
3930
3931 /* Ask the linker to do its stuff. */
3932 (*htab->layout_sections_again) ();
3933 stub_changed = false;
3934 }
3935
3936 free (htab->all_local_syms);
3937 return true;
3938
3939 error_ret_free_local:
3940 free (htab->all_local_syms);
3941 return false;
3942 }
3943
3944 /* Build all the stubs associated with the current output file. The
3945 stubs are kept in a hash table attached to the main linker hash
3946 table. This function is called via metagelf_finish in the linker. */
3947
3948 bool
elf_metag_build_stubs(struct bfd_link_info * info)3949 elf_metag_build_stubs (struct bfd_link_info *info)
3950 {
3951 asection *stub_sec;
3952 struct bfd_hash_table *table;
3953 struct elf_metag_link_hash_table *htab;
3954
3955 htab = metag_link_hash_table (info);
3956
3957 for (stub_sec = htab->stub_bfd->sections;
3958 stub_sec != NULL;
3959 stub_sec = stub_sec->next)
3960 {
3961 bfd_size_type size;
3962
3963 /* Allocate memory to hold the linker stubs. */
3964 size = stub_sec->size;
3965 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
3966 if (stub_sec->contents == NULL && size != 0)
3967 return false;
3968 stub_sec->size = 0;
3969 }
3970
3971 /* Build the stubs as directed by the stub hash table. */
3972 table = &htab->bstab;
3973 bfd_hash_traverse (table, metag_build_one_stub, info);
3974
3975 return true;
3976 }
3977
3978 /* Return TRUE if SYM represents a local label symbol. */
3979
3980 static bool
elf_metag_is_local_label_name(bfd * abfd ATTRIBUTE_UNUSED,const char * name)3981 elf_metag_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name)
3982 {
3983 if (name[0] == '$' && name[1] == 'L')
3984 return 1;
3985 return _bfd_elf_is_local_label_name (abfd, name);
3986 }
3987
3988 /* Return address for Ith PLT stub in section PLT, for relocation REL
3989 or (bfd_vma) -1 if it should not be included. */
3990
3991 static bfd_vma
elf_metag_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3992 elf_metag_plt_sym_val (bfd_vma i, const asection *plt,
3993 const arelent *rel ATTRIBUTE_UNUSED)
3994 {
3995 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3996 }
3997
3998 #define ELF_ARCH bfd_arch_metag
3999 #define ELF_TARGET_ID METAG_ELF_DATA
4000 #define ELF_MACHINE_CODE EM_METAG
4001 #define ELF_MINPAGESIZE 0x1000
4002 #define ELF_MAXPAGESIZE 0x4000
4003 #define ELF_COMMONPAGESIZE 0x1000
4004
4005 #define TARGET_LITTLE_SYM metag_elf32_vec
4006 #define TARGET_LITTLE_NAME "elf32-metag"
4007
4008 #define elf_symbol_leading_char '_'
4009
4010 #define elf_info_to_howto_rel NULL
4011 #define elf_info_to_howto metag_info_to_howto_rela
4012
4013 #define bfd_elf32_bfd_is_local_label_name elf_metag_is_local_label_name
4014 #define bfd_elf32_bfd_link_hash_table_create \
4015 elf_metag_link_hash_table_create
4016 #define elf_backend_relocate_section elf_metag_relocate_section
4017 #define elf_backend_gc_mark_hook elf_metag_gc_mark_hook
4018 #define elf_backend_check_relocs elf_metag_check_relocs
4019 #define elf_backend_create_dynamic_sections elf_metag_create_dynamic_sections
4020 #define elf_backend_adjust_dynamic_symbol elf_metag_adjust_dynamic_symbol
4021 #define elf_backend_finish_dynamic_symbol elf_metag_finish_dynamic_symbol
4022 #define elf_backend_finish_dynamic_sections elf_metag_finish_dynamic_sections
4023 #define elf_backend_size_dynamic_sections elf_metag_size_dynamic_sections
4024 #define elf_backend_omit_section_dynsym \
4025 _bfd_elf_omit_section_dynsym_all
4026 #define elf_backend_init_file_header elf_metag_init_file_header
4027 #define elf_backend_reloc_type_class elf_metag_reloc_type_class
4028 #define elf_backend_copy_indirect_symbol elf_metag_copy_indirect_symbol
4029 #define elf_backend_plt_sym_val elf_metag_plt_sym_val
4030
4031 #define elf_backend_can_gc_sections 1
4032 #define elf_backend_can_refcount 1
4033 #define elf_backend_rela_normal 1
4034 #define elf_backend_want_got_plt 1
4035 #define elf_backend_want_got_sym 0
4036 #define elf_backend_want_plt_sym 0
4037 #define elf_backend_plt_readonly 1
4038 #define elf_backend_dtrel_excludes_plt 1
4039 #define elf_backend_want_dynrelro 1
4040
4041 #define bfd_elf32_bfd_reloc_type_lookup metag_reloc_type_lookup
4042 #define bfd_elf32_bfd_reloc_name_lookup metag_reloc_name_lookup
4043
4044 #include "elf32-target.h"
4045