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[binutils-gdb.git] / bfd / elf32-metag.c
blobc901aa99c23a6c52818c549c6c8cfee2578cc2d3
1 /* Meta support for 32-bit ELF
2 Copyright (C) 2013-2017 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 elf_metag_dyn_reloc_entry "hdh"
90
91 Always remember to use GNU Coding Style. */
92
93 #define PLT_ENTRY_SIZE sizeof(plt_entry)
94
95 static reloc_howto_type elf_metag_howto_table[] =
96 {
97 /* High order 16 bit absolute. */
98 HOWTO (R_METAG_HIADDR16, /* type */
99 16, /* rightshift */
100 2, /* size (0 = byte, 1 = short, 2 = long) */
101 16, /* bitsize */
102 FALSE, /* pc_relative */
103 3, /* bitpos */
104 complain_overflow_dont, /* complain_on_overflow */
105 bfd_elf_generic_reloc, /* special_function */
106 "R_METAG_HIADDR16", /* name */
107 FALSE, /* partial_inplace */
108 0, /* src_mask */
109 0x0007fff8, /* dst_mask */
110 FALSE), /* pcrel_offset */
111
112 /* Low order 16 bit absolute. */
113 HOWTO (R_METAG_LOADDR16, /* type */
114 0, /* rightshift */
115 2, /* size (0 = byte, 1 = short, 2 = long) */
116 16, /* bitsize */
117 FALSE, /* pc_relative */
118 3, /* bitpos */
119 complain_overflow_dont,/* complain_on_overflow */
120 bfd_elf_generic_reloc, /* special_function */
121 "R_METAG_LOADDR16", /* name */
122 FALSE, /* partial_inplace */
123 0, /* src_mask */
124 0x0007fff8, /* dst_mask */
125 FALSE), /* pcrel_offset */
126
127 /* 32 bit absolute. */
128 HOWTO (R_METAG_ADDR32, /* type */
129 0, /* rightshift */
130 2, /* size (0 = byte, 1 = short, 2 = long) */
131 32, /* bitsize */
132 FALSE, /* pc_relative */
133 0, /* bitpos */
134 complain_overflow_bitfield, /* complain_on_overflow */
135 bfd_elf_generic_reloc, /* special_function */
136 "R_METAG_ADDR32", /* name */
137 FALSE, /* partial_inplace */
138 0x00000000, /* src_mask */
139 0xffffffff, /* dst_mask */
140 FALSE), /* pcrel_offset */
141
142 /* No relocation. */
143 HOWTO (R_METAG_NONE, /* type */
144 0, /* rightshift */
145 3, /* size (0 = byte, 1 = short, 2 = long) */
146 0, /* bitsize */
147 FALSE, /* pc_relative */
148 0, /* bitpos */
149 complain_overflow_dont, /* complain_on_overflow */
150 bfd_elf_generic_reloc, /* special_function */
151 "R_METAG_NONE", /* name */
152 FALSE, /* partial_inplace */
153 0, /* src_mask */
154 0, /* dst_mask */
155 FALSE), /* pcrel_offset */
156
157 /* 19 bit pc relative */
158 HOWTO (R_METAG_RELBRANCH, /* type */
159 2, /* rightshift */
160 2, /* size (0 = byte, 1 = short, 2 = long) */
161 19, /* bitsize */
162 TRUE, /* pc_relative */
163 5, /* bitpos */
164 complain_overflow_signed, /* complain_on_overflow */
165 bfd_elf_generic_reloc, /* special_function */
166 "R_METAG_RELBRANCH", /* name */
167 FALSE, /* partial_inplace */
168 0, /* src_mask */
169 0x00ffffe0, /* dst_mask */
170 FALSE), /* pcrel_offset */
171
172 /* GET/SET offset */
173 HOWTO (R_METAG_GETSETOFF, /* type */
174 0, /* rightshift */
175 1, /* size (0 = byte, 1 = short, 2 = long) */
176 12, /* bitsize */
177 FALSE, /* pc_relative */
178 7, /* bitpos */
179 complain_overflow_dont, /* complain_on_overflow */
180 bfd_elf_generic_reloc, /* special_function */
181 "R_METAG_GETSETOFF", /* name */
182 FALSE, /* partial_inplace */
183 0, /* src_mask */
184 0, /* dst_mask */
185 FALSE), /* pcrel_offset */
186
187 EMPTY_HOWTO (6),
188 EMPTY_HOWTO (7),
189 EMPTY_HOWTO (8),
190 EMPTY_HOWTO (9),
191 EMPTY_HOWTO (10),
192 EMPTY_HOWTO (11),
193 EMPTY_HOWTO (12),
194 EMPTY_HOWTO (13),
195 EMPTY_HOWTO (14),
196 EMPTY_HOWTO (15),
197 EMPTY_HOWTO (16),
198 EMPTY_HOWTO (17),
199 EMPTY_HOWTO (18),
200 EMPTY_HOWTO (19),
201 EMPTY_HOWTO (20),
202 EMPTY_HOWTO (21),
203 EMPTY_HOWTO (22),
204 EMPTY_HOWTO (23),
205 EMPTY_HOWTO (24),
206 EMPTY_HOWTO (25),
207 EMPTY_HOWTO (26),
208 EMPTY_HOWTO (27),
209 EMPTY_HOWTO (28),
210 EMPTY_HOWTO (29),
211
212 HOWTO (R_METAG_GNU_VTINHERIT, /* type */
213 0, /* rightshift */
214 2, /* size (0 = byte, 1 = short, 2 = long) */
215 0, /* bitsize */
216 FALSE, /* pc_relative */
217 0, /* bitpos */
218 complain_overflow_dont, /* complain_on_overflow */
219 NULL, /* special_function */
220 "R_METAG_GNU_VTINHERIT", /* name */
221 FALSE, /* partial_inplace */
222 0, /* src_mask */
223 0, /* dst_mask */
224 FALSE), /* pcrel_offset */
225
226 HOWTO (R_METAG_GNU_VTENTRY, /* type */
227 0, /* rightshift */
228 2, /* size (0 = byte, 1 = short, 2 = long) */
229 0, /* bitsize */
230 FALSE, /* pc_relative */
231 0, /* bitpos */
232 complain_overflow_dont, /* complain_on_overflow */
233 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
234 "R_METAG_GNU_VTENTRY", /* name */
235 FALSE, /* partial_inplace */
236 0, /* src_mask */
237 0, /* dst_mask */
238 FALSE), /* pcrel_offset */
239
240 /* High order 16 bit GOT offset */
241 HOWTO (R_METAG_HI16_GOTOFF, /* type */
242 16, /* rightshift */
243 2, /* size (0 = byte, 1 = short, 2 = long) */
244 16, /* bitsize */
245 FALSE, /* pc_relative */
246 3, /* bitpos */
247 complain_overflow_dont, /* complain_on_overflow */
248 bfd_elf_generic_reloc, /* special_function */
249 "R_METAG_HI16_GOTOFF", /* name */
250 FALSE, /* partial_inplace */
251 0, /* src_mask */
252 0x0007fff8, /* dst_mask */
253 FALSE), /* pcrel_offset */
254
255 /* Low order 16 bit GOT offset */
256 HOWTO (R_METAG_LO16_GOTOFF, /* type */
257 0, /* rightshift */
258 2, /* size (0 = byte, 1 = short, 2 = long) */
259 16, /* bitsize */
260 FALSE, /* pc_relative */
261 3, /* bitpos */
262 complain_overflow_dont, /* complain_on_overflow */
263 bfd_elf_generic_reloc, /* special_function */
264 "R_METAG_LO16_GOTOFF", /* name */
265 FALSE, /* partial_inplace */
266 0, /* src_mask */
267 0x0007fff8, /* dst_mask */
268 FALSE), /* pcrel_offset */
269
270 /* GET/SET GOT offset */
271 HOWTO (R_METAG_GETSET_GOTOFF, /* type */
272 0, /* rightshift */
273 1, /* size (0 = byte, 1 = short, 2 = long) */
274 12, /* bitsize */
275 FALSE, /* pc_relative */
276 7, /* bitpos */
277 complain_overflow_dont, /* complain_on_overflow */
278 bfd_elf_generic_reloc, /* special_function */
279 "R_METAG_GETSET_GOTOFF", /* name */
280 FALSE, /* partial_inplace */
281 0, /* src_mask */
282 0, /* dst_mask */
283 FALSE), /* pcrel_offset */
284
285 /* GET/SET GOT relative */
286 HOWTO (R_METAG_GETSET_GOT, /* type */
287 0, /* rightshift */
288 1, /* size (0 = byte, 1 = short, 2 = long) */
289 12, /* bitsize */
290 FALSE, /* pc_relative */
291 7, /* bitpos */
292 complain_overflow_dont, /* complain_on_overflow */
293 bfd_elf_generic_reloc, /* special_function */
294 "R_METAG_GETSET_GOT", /* name */
295 FALSE, /* partial_inplace */
296 0, /* src_mask */
297 0, /* dst_mask */
298 FALSE), /* pcrel_offset */
299
300 /* High order 16 bit GOT reference */
301 HOWTO (R_METAG_HI16_GOTPC, /* type */
302 16, /* rightshift */
303 2, /* size (0 = byte, 1 = short, 2 = long) */
304 16, /* bitsize */
305 FALSE, /* pc_relative */
306 3, /* bitpos */
307 complain_overflow_dont, /* complain_on_overflow */
308 bfd_elf_generic_reloc, /* special_function */
309 "R_METAG_HI16_GOTPC", /* name */
310 FALSE, /* partial_inplace */
311 0, /* src_mask */
312 0x0007fff8, /* dst_mask */
313 FALSE), /* pcrel_offset */
314
315 /* Low order 16 bit GOT reference */
316 HOWTO (R_METAG_LO16_GOTPC, /* type */
317 0, /* rightshift */
318 2, /* size (0 = byte, 1 = short, 2 = long) */
319 16, /* bitsize */
320 FALSE, /* pc_relative */
321 3, /* bitpos */
322 complain_overflow_dont, /* complain_on_overflow */
323 bfd_elf_generic_reloc, /* special_function */
324 "R_METAG_LO16_GOTPC", /* name */
325 FALSE, /* partial_inplace */
326 0, /* src_mask */
327 0x0007fff8, /* dst_mask */
328 FALSE), /* pcrel_offset */
329
330 /* High order 16 bit PLT */
331 HOWTO (R_METAG_HI16_PLT, /* type */
332 16, /* rightshift */
333 2, /* size (0 = byte, 1 = short, 2 = long) */
334 16, /* bitsize */
335 FALSE, /* pc_relative */
336 3, /* bitpos */
337 complain_overflow_dont, /* complain_on_overflow */
338 bfd_elf_generic_reloc, /* special_function */
339 "R_METAG_HI16_PLT", /* name */
340 FALSE, /* partial_inplace */
341 0, /* src_mask */
342 0x0007fff8, /* dst_mask */
343 FALSE), /* pcrel_offset */
344
345 /* Low order 16 bit PLT */
346 HOWTO (R_METAG_LO16_PLT, /* type */
347 0, /* rightshift */
348 2, /* size (0 = byte, 1 = short, 2 = long) */
349 16, /* bitsize */
350 FALSE, /* pc_relative */
351 3, /* bitpos */
352 complain_overflow_dont, /* complain_on_overflow */
353 bfd_elf_generic_reloc, /* special_function */
354 "R_METAG_LO16_PLT", /* name */
355 FALSE, /* partial_inplace */
356 0, /* src_mask */
357 0xffffffff, /* dst_mask */
358 FALSE), /* pcrel_offset */
359
360 HOWTO (R_METAG_RELBRANCH_PLT, /* type */
361 2, /* rightshift */
362 2, /* size (0 = byte, 1 = short, 2 = long) */
363 19, /* bitsize */
364 TRUE, /* pc_relative */
365 5, /* bitpos */
366 complain_overflow_signed, /* complain_on_overflow */
367 bfd_elf_generic_reloc, /* special_function */
368 "R_METAG_RELBRANCH_PLT", /* name */
369 FALSE, /* partial_inplace */
370 0, /* src_mask */
371 0x00ffffe0, /* dst_mask */
372 FALSE), /* pcrel_offset */
373
374 /* Dummy relocs used by the linker internally. */
375 HOWTO (R_METAG_GOTOFF, /* type */
376 0, /* rightshift */
377 2, /* size (0 = byte, 1 = short, 2 = long) */
378 32, /* bitsize */
379 FALSE, /* pc_relative */
380 0, /* bitpos */
381 complain_overflow_bitfield, /* complain_on_overflow */
382 bfd_elf_generic_reloc, /* special_function */
383 "R_METAG_GOTOFF", /* name */
384 FALSE, /* partial_inplace */
385 0xffffffff, /* src_mask */
386 0xffffffff, /* dst_mask */
387 FALSE), /* pcrel_offset */
388
389 HOWTO (R_METAG_PLT, /* type */
390 0, /* rightshift */
391 2, /* size (0 = byte, 1 = short, 2 = long) */
392 32, /* bitsize */
393 FALSE, /* pc_relative */
394 0, /* bitpos */
395 complain_overflow_bitfield, /* complain_on_overflow */
396 bfd_elf_generic_reloc, /* special_function */
397 "R_METAG_GOTOFF", /* name */
398 FALSE, /* partial_inplace */
399 0xffffffff, /* src_mask */
400 0xffffffff, /* dst_mask */
401 FALSE), /* pcrel_offset */
402
403 /* This is used only by the dynamic linker. The symbol should exist
404 both in the object being run and in some shared library. The
405 dynamic linker copies the data addressed by the symbol from the
406 shared library into the object, because the object being
407 run has to have the data at some particular address. */
408 HOWTO (R_METAG_COPY, /* type */
409 0, /* rightshift */
410 2, /* size (0 = byte, 1 = short, 2 = long) */
411 32, /* bitsize */
412 FALSE, /* pc_relative */
413 0, /* bitpos */
414 complain_overflow_bitfield, /* complain_on_overflow */
415 bfd_elf_generic_reloc, /* special_function */
416 "R_METAG_COPY", /* name */
417 FALSE, /* partial_inplace */
418 0xffffffff, /* src_mask */
419 0xffffffff, /* dst_mask */
420 FALSE), /* pcrel_offset */
421
422 /* Marks a procedure linkage table entry for a symbol. */
423 HOWTO (R_METAG_JMP_SLOT, /* type */
424 0, /* rightshift */
425 2, /* size (0 = byte, 1 = short, 2 = long) */
426 32, /* bitsize */
427 FALSE, /* pc_relative */
428 0, /* bitpos */
429 complain_overflow_bitfield, /* complain_on_overflow */
430 bfd_elf_generic_reloc, /* special_function */
431 "R_METAG_JMP_SLOT", /* name */
432 FALSE, /* partial_inplace */
433 0xffffffff, /* src_mask */
434 0xffffffff, /* dst_mask */
435 FALSE), /* pcrel_offset */
436
437 /* Used only by the dynamic linker. When the object is run, this
438 longword is set to the load address of the object, plus the
439 addend. */
440 HOWTO (R_METAG_RELATIVE, /* type */
441 0, /* rightshift */
442 2, /* size (0 = byte, 1 = short, 2 = long) */
443 32, /* bitsize */
444 FALSE, /* pc_relative */
445 0, /* bitpos */
446 complain_overflow_bitfield, /* complain_on_overflow */
447 bfd_elf_generic_reloc, /* special_function */
448 "R_METAG_RELATIVE", /* name */
449 FALSE, /* partial_inplace */
450 0xffffffff, /* src_mask */
451 0xffffffff, /* dst_mask */
452 FALSE), /* pcrel_offset */
453
454 HOWTO (R_METAG_GLOB_DAT, /* type */
455 0, /* rightshift */
456 2, /* size (0 = byte, 1 = short, 2 = long) */
457 32, /* bitsize */
458 FALSE, /* pc_relative */
459 0, /* bitpos */
460 complain_overflow_bitfield, /* complain_on_overflow */
461 bfd_elf_generic_reloc, /* special_function */
462 "R_METAG_GLOB_DAT", /* name */
463 FALSE, /* partial_inplace */
464 0xffffffff, /* src_mask */
465 0xffffffff, /* dst_mask */
466 FALSE), /* pcrel_offset */
467
468 HOWTO (R_METAG_TLS_GD, /* type */
469 0, /* rightshift */
470 2, /* size (0 = byte, 1 = short, 2 = long) */
471 16, /* bitsize */
472 FALSE, /* pc_relative */
473 3, /* bitpos */
474 complain_overflow_dont, /* complain_on_overflow */
475 bfd_elf_generic_reloc, /* special_function */
476 "R_METAG_TLS_GD", /* name */
477 FALSE, /* partial_inplace */
478 0, /* src_mask */
479 0x0007fff8, /* dst_mask */
480 FALSE), /* pcrel_offset */
481
482 HOWTO (R_METAG_TLS_LDM, /* type */
483 0, /* rightshift */
484 2, /* size (0 = byte, 1 = short, 2 = long) */
485 16, /* bitsize */
486 FALSE, /* pc_relative */
487 3, /* bitpos */
488 complain_overflow_bitfield, /* complain_on_overflow */
489 bfd_elf_generic_reloc, /* special_function */
490 "R_METAG_TLS_LDM", /* name */
491 FALSE, /* partial_inplace */
492 0, /* src_mask */
493 0x0007fff8, /* dst_mask */
494 FALSE), /* pcrel_offset */
495
496 HOWTO (R_METAG_TLS_LDO_HI16, /* type */
497 16, /* rightshift */
498 2, /* size (0 = byte, 1 = short, 2 = long) */
499 16, /* bitsize */
500 FALSE, /* pc_relative */
501 3, /* bitpos */
502 complain_overflow_bitfield, /* complain_on_overflow */
503 bfd_elf_generic_reloc, /* special_function */
504 "R_METAG_TLS_LDO_HI16", /* name */
505 FALSE, /* partial_inplace */
506 0, /* src_mask */
507 0x0007fff8, /* dst_mask */
508 FALSE), /* pcrel_offset */
509
510 HOWTO (R_METAG_TLS_LDO_LO16, /* type */
511 0, /* rightshift */
512 2, /* size (0 = byte, 1 = short, 2 = long) */
513 16, /* bitsize */
514 FALSE, /* pc_relative */
515 3, /* bitpos */
516 complain_overflow_bitfield, /* complain_on_overflow */
517 bfd_elf_generic_reloc, /* special_function */
518 "R_METAG_TLS_LDO_LO16", /* name */
519 FALSE, /* partial_inplace */
520 0, /* src_mask */
521 0x0007fff8, /* dst_mask */
522 FALSE), /* pcrel_offset */
523
524 /* Dummy reloc used by the linker internally. */
525 HOWTO (R_METAG_TLS_LDO, /* type */
526 0, /* rightshift */
527 2, /* size (0 = byte, 1 = short, 2 = long) */
528 16, /* bitsize */
529 FALSE, /* pc_relative */
530 3, /* bitpos */
531 complain_overflow_bitfield, /* complain_on_overflow */
532 bfd_elf_generic_reloc, /* special_function */
533 "R_METAG_TLS_LDO", /* name */
534 FALSE, /* partial_inplace */
535 0, /* src_mask */
536 0x0007fff8, /* dst_mask */
537 FALSE), /* pcrel_offset */
538
539 HOWTO (R_METAG_TLS_IE, /* type */
540 2, /* rightshift */
541 2, /* size (0 = byte, 1 = short, 2 = long) */
542 12, /* bitsize */
543 FALSE, /* pc_relative */
544 7, /* bitpos */
545 complain_overflow_dont, /* complain_on_overflow */
546 bfd_elf_generic_reloc, /* special_function */
547 "R_METAG_TLS_IE", /* name */
548 FALSE, /* partial_inplace */
549 0, /* src_mask */
550 0x0007ff80, /* dst_mask */
551 FALSE), /* pcrel_offset */
552
553 /* Dummy reloc used by the linker internally. */
554 HOWTO (R_METAG_TLS_IENONPIC, /* type */
555 0, /* rightshift */
556 2, /* size (0 = byte, 1 = short, 2 = long) */
557 16, /* bitsize */
558 FALSE, /* pc_relative */
559 3, /* bitpos */
560 complain_overflow_dont, /* complain_on_overflow */
561 bfd_elf_generic_reloc, /* special_function */
562 "R_METAG_TLS_IENONPIC", /* name */
563 FALSE, /* partial_inplace */
564 0, /* src_mask */
565 0x0007fff8, /* dst_mask */
566 FALSE), /* pcrel_offset */
567
568 HOWTO (R_METAG_TLS_IENONPIC_HI16,/* type */
569 16, /* rightshift */
570 2, /* size (0 = byte, 1 = short, 2 = long) */
571 16, /* bitsize */
572 FALSE, /* pc_relative */
573 3, /* bitpos */
574 complain_overflow_dont, /* complain_on_overflow */
575 bfd_elf_generic_reloc, /* special_function */
576 "R_METAG_TLS_IENONPIC_HI16", /* name */
577 FALSE, /* partial_inplace */
578 0, /* src_mask */
579 0x0007fff8, /* dst_mask */
580 FALSE), /* pcrel_offset */
581
582 HOWTO (R_METAG_TLS_IENONPIC_LO16,/* type */
583 0, /* rightshift */
584 2, /* size (0 = byte, 1 = short, 2 = long) */
585 16, /* bitsize */
586 FALSE, /* pc_relative */
587 3, /* bitpos */
588 complain_overflow_dont, /* complain_on_overflow */
589 bfd_elf_generic_reloc, /* special_function */
590 "R_METAG_TLS_IENONPIC_LO16", /* name */
591 FALSE, /* partial_inplace */
592 0, /* src_mask */
593 0x0007fff8, /* dst_mask */
594 FALSE), /* pcrel_offset */
595
596 HOWTO (R_METAG_TLS_TPOFF, /* type */
597 0, /* rightshift */
598 2, /* size (0 = byte, 1 = short, 2 = long) */
599 32, /* bitsize */
600 FALSE, /* pc_relative */
601 0, /* bitpos */
602 complain_overflow_bitfield, /* complain_on_overflow */
603 bfd_elf_generic_reloc, /* special_function */
604 "R_METAG_TLS_TPOFF", /* name */
605 FALSE, /* partial_inplace */
606 0, /* src_mask */
607 0xffffffff, /* dst_mask */
608 FALSE), /* pcrel_offset */
609
610 HOWTO (R_METAG_TLS_DTPMOD, /* type */
611 0, /* rightshift */
612 2, /* size (0 = byte, 1 = short, 2 = long) */
613 32, /* bitsize */
614 FALSE, /* pc_relative */
615 0, /* bitpos */
616 complain_overflow_bitfield, /* complain_on_overflow */
617 bfd_elf_generic_reloc, /* special_function */
618 "R_METAG_TLS_DTPMOD", /* name */
619 FALSE, /* partial_inplace */
620 0, /* src_mask */
621 0xffffffff, /* dst_mask */
622 FALSE), /* pcrel_offset */
623
624 HOWTO (R_METAG_TLS_DTPOFF, /* type */
625 0, /* rightshift */
626 2, /* size (0 = byte, 1 = short, 2 = long) */
627 32, /* bitsize */
628 FALSE, /* pc_relative */
629 0, /* bitpos */
630 complain_overflow_bitfield, /* complain_on_overflow */
631 bfd_elf_generic_reloc, /* special_function */
632 "R_METAG_TLS_DTPOFF", /* name */
633 FALSE, /* partial_inplace */
634 0, /* src_mask */
635 0xffffffff, /* dst_mask */
636 FALSE), /* pcrel_offset */
637
638 /* Dummy reloc used by the linker internally. */
639 HOWTO (R_METAG_TLS_LE, /* type */
640 0, /* rightshift */
641 2, /* size (0 = byte, 1 = short, 2 = long) */
642 32, /* bitsize */
643 FALSE, /* pc_relative */
644 0, /* bitpos */
645 complain_overflow_bitfield, /* complain_on_overflow */
646 bfd_elf_generic_reloc, /* special_function */
647 "R_METAG_TLS_LE", /* name */
648 FALSE, /* partial_inplace */
649 0, /* src_mask */
650 0xffffffff, /* dst_mask */
651 FALSE), /* pcrel_offset */
652
653 HOWTO (R_METAG_TLS_LE_HI16, /* type */
654 16, /* rightshift */
655 2, /* size (0 = byte, 1 = short, 2 = long) */
656 16, /* bitsize */
657 FALSE, /* pc_relative */
658 3, /* bitpos */
659 complain_overflow_dont, /* complain_on_overflow */
660 bfd_elf_generic_reloc, /* special_function */
661 "R_METAG_TLS_LE_HI16", /* name */
662 FALSE, /* partial_inplace */
663 0, /* src_mask */
664 0x0007fff8, /* dst_mask */
665 FALSE), /* pcrel_offset */
666
667 HOWTO (R_METAG_TLS_LE_LO16, /* type */
668 0, /* rightshift */
669 2, /* size (0 = byte, 1 = short, 2 = long) */
670 16, /* bitsize */
671 FALSE, /* pc_relative */
672 3, /* bitpos */
673 complain_overflow_dont, /* complain_on_overflow */
674 bfd_elf_generic_reloc, /* special_function */
675 "R_METAG_TLS_LE_LO16", /* name */
676 FALSE, /* partial_inplace */
677 0, /* src_mask */
678 0x0007fff8, /* dst_mask */
679 FALSE), /* pcrel_offset */
680
681 };
682
683 #define BRANCH_BITS 19
684
685 /* The GOT is typically accessed using a [GS]ETD instruction. The size of the
686 immediate offset which can be used in such instructions therefore limits
687 the usable size of the GOT. If the base register for the [GS]ETD (A1LbP)
688 is pointing to the base of the GOT then the size is limited to the maximum
689 11 bits unsigned dword offset, or 2^13 = 0x2000 bytes. However the offset
690 in a [GS]ETD instruction is signed, so by setting the base address register
691 to an offset of that 0x2000 byte maximum unsigned offset from the base of
692 the GOT we can use negative offsets in addition to positive. This
693 effectively doubles the usable GOT size to 0x4000 bytes. */
694 #define GOT_REG_OFFSET 0x2000
695
696 struct metag_reloc_map
697 {
698 bfd_reloc_code_real_type bfd_reloc_val;
699 unsigned int metag_reloc_val;
700 };
701
702 static const struct metag_reloc_map metag_reloc_map [] =
703 {
704 { BFD_RELOC_NONE, R_METAG_NONE },
705 { BFD_RELOC_32, R_METAG_ADDR32 },
706 { BFD_RELOC_METAG_HIADDR16, R_METAG_HIADDR16 },
707 { BFD_RELOC_METAG_LOADDR16, R_METAG_LOADDR16 },
708 { BFD_RELOC_METAG_RELBRANCH, R_METAG_RELBRANCH },
709 { BFD_RELOC_METAG_GETSETOFF, R_METAG_GETSETOFF },
710 { BFD_RELOC_VTABLE_INHERIT, R_METAG_GNU_VTINHERIT },
711 { BFD_RELOC_VTABLE_ENTRY, R_METAG_GNU_VTENTRY },
712 { BFD_RELOC_METAG_REL8, R_METAG_REL8 },
713 { BFD_RELOC_METAG_REL16, R_METAG_REL16 },
714 { BFD_RELOC_METAG_HI16_GOTOFF, R_METAG_HI16_GOTOFF },
715 { BFD_RELOC_METAG_LO16_GOTOFF, R_METAG_LO16_GOTOFF },
716 { BFD_RELOC_METAG_GETSET_GOTOFF, R_METAG_GETSET_GOTOFF },
717 { BFD_RELOC_METAG_GETSET_GOT, R_METAG_GETSET_GOT },
718 { BFD_RELOC_METAG_HI16_GOTPC, R_METAG_HI16_GOTPC },
719 { BFD_RELOC_METAG_LO16_GOTPC, R_METAG_LO16_GOTPC },
720 { BFD_RELOC_METAG_HI16_PLT, R_METAG_HI16_PLT },
721 { BFD_RELOC_METAG_LO16_PLT, R_METAG_LO16_PLT },
722 { BFD_RELOC_METAG_RELBRANCH_PLT, R_METAG_RELBRANCH_PLT },
723 { BFD_RELOC_METAG_GOTOFF, R_METAG_GOTOFF },
724 { BFD_RELOC_METAG_PLT, R_METAG_PLT },
725 { BFD_RELOC_METAG_COPY, R_METAG_COPY },
726 { BFD_RELOC_METAG_JMP_SLOT, R_METAG_JMP_SLOT },
727 { BFD_RELOC_METAG_RELATIVE, R_METAG_RELATIVE },
728 { BFD_RELOC_METAG_GLOB_DAT, R_METAG_GLOB_DAT },
729 { BFD_RELOC_METAG_TLS_GD, R_METAG_TLS_GD },
730 { BFD_RELOC_METAG_TLS_LDM, R_METAG_TLS_LDM },
731 { BFD_RELOC_METAG_TLS_LDO_HI16, R_METAG_TLS_LDO_HI16 },
732 { BFD_RELOC_METAG_TLS_LDO_LO16, R_METAG_TLS_LDO_LO16 },
733 { BFD_RELOC_METAG_TLS_LDO, R_METAG_TLS_LDO },
734 { BFD_RELOC_METAG_TLS_IE, R_METAG_TLS_IE },
735 { BFD_RELOC_METAG_TLS_IENONPIC, R_METAG_TLS_IENONPIC },
736 { BFD_RELOC_METAG_TLS_IENONPIC_HI16, R_METAG_TLS_IENONPIC_HI16 },
737 { BFD_RELOC_METAG_TLS_IENONPIC_LO16, R_METAG_TLS_IENONPIC_LO16 },
738 { BFD_RELOC_METAG_TLS_TPOFF, R_METAG_TLS_TPOFF },
739 { BFD_RELOC_METAG_TLS_DTPMOD, R_METAG_TLS_DTPMOD },
740 { BFD_RELOC_METAG_TLS_DTPOFF, R_METAG_TLS_DTPOFF },
741 { BFD_RELOC_METAG_TLS_LE, R_METAG_TLS_LE },
742 { BFD_RELOC_METAG_TLS_LE_HI16, R_METAG_TLS_LE_HI16 },
743 { BFD_RELOC_METAG_TLS_LE_LO16, R_METAG_TLS_LE_LO16 },
744 };
745
746 enum elf_metag_stub_type
747 {
748 metag_stub_long_branch,
749 metag_stub_long_branch_shared,
750 metag_stub_none
751 };
752
753 struct elf_metag_stub_hash_entry
754 {
755 /* Base hash table entry structure. */
756 struct bfd_hash_entry bh_root;
757
758 /* The stub section. */
759 asection *stub_sec;
760
761 /* Offset within stub_sec of the beginning of this stub. */
762 bfd_vma stub_offset;
763
764 /* Given the symbol's value and its section we can determine its final
765 value when building the stubs (so the stub knows where to jump. */
766 bfd_vma target_value;
767 asection *target_section;
768
769 enum elf_metag_stub_type stub_type;
770
771 /* The symbol table entry, if any, that this was derived from. */
772 struct elf_metag_link_hash_entry *hh;
773
774 /* And the reloc addend that this was derived from. */
775 bfd_vma addend;
776
777 /* Where this stub is being called from, or, in the case of combined
778 stub sections, the first input section in the group. */
779 asection *id_sec;
780 };
781
782 struct elf_metag_link_hash_entry
783 {
784 struct elf_link_hash_entry eh;
785
786 /* A pointer to the most recently used stub hash entry against this
787 symbol. */
788 struct elf_metag_stub_hash_entry *hsh_cache;
789
790 /* Used to count relocations for delayed sizing of relocation
791 sections. */
792 struct elf_metag_dyn_reloc_entry {
793
794 /* Next relocation in the chain. */
795 struct elf_metag_dyn_reloc_entry *hdh_next;
796
797 /* The input section of the reloc. */
798 asection *sec;
799
800 /* Number of relocs copied in this section. */
801 bfd_size_type count;
802
803 /* Number of relative relocs copied for the input section. */
804 bfd_size_type relative_count;
805 } *dyn_relocs;
806
807 enum
808 {
809 GOT_UNKNOWN = 0, GOT_NORMAL = 1, GOT_TLS_IE = 2, GOT_TLS_LDM = 4, GOT_TLS_GD = 8
810 } tls_type;
811 };
812
813 struct elf_metag_link_hash_table
814 {
815 /* The main hash table. */
816 struct elf_link_hash_table etab;
817
818 /* The stub hash table. */
819 struct bfd_hash_table bstab;
820
821 /* Linker stub bfd. */
822 bfd *stub_bfd;
823
824 /* Linker call-backs. */
825 asection * (*add_stub_section) (const char *, asection *);
826 void (*layout_sections_again) (void);
827
828 /* Array to keep track of which stub sections have been created, and
829 information on stub grouping. */
830 struct map_stub
831 {
832 /* This is the section to which stubs in the group will be
833 attached. */
834 asection *link_sec;
835 /* The stub section. */
836 asection *stub_sec;
837 } *stub_group;
838
839 /* Assorted information used by elf_metag_size_stubs. */
840 unsigned int bfd_count;
841 unsigned int top_index;
842 asection **input_list;
843 Elf_Internal_Sym **all_local_syms;
844
845 /* Small local sym cache. */
846 struct sym_cache sym_cache;
847
848 /* Data for LDM relocations. */
849 union
850 {
851 bfd_signed_vma refcount;
852 bfd_vma offset;
853 } tls_ldm_got;
854 };
855
856 /* Return the base vma address which should be subtracted from the
857 real address when resolving a dtpoff relocation. This is PT_TLS
858 segment p_vaddr. */
859 static bfd_vma
860 dtpoff_base (struct bfd_link_info *info)
861 {
862 /* If tls_sec is NULL, we should have signalled an error already. */
863 if (elf_hash_table (info)->tls_sec == NULL)
864 return 0;
865 return elf_hash_table (info)->tls_sec->vma;
866 }
867
868 /* Return the relocation value for R_METAG_TLS_IE */
869 static bfd_vma
870 tpoff (struct bfd_link_info *info, bfd_vma address)
871 {
872 /* If tls_sec is NULL, we should have signalled an error already. */
873 if (elf_hash_table (info)->tls_sec == NULL)
874 return 0;
875 /* METAG TLS ABI is variant I and static TLS blocks start just after
876 tcbhead structure which has 2 pointer fields. */
877 return (address - elf_hash_table (info)->tls_sec->vma
878 + align_power ((bfd_vma) 8,
879 elf_hash_table (info)->tls_sec->alignment_power));
880 }
881
882 static void
883 metag_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
884 arelent *cache_ptr,
885 Elf_Internal_Rela *dst)
886 {
887 unsigned int r_type;
888
889 r_type = ELF32_R_TYPE (dst->r_info);
890 if (r_type >= (unsigned int) R_METAG_MAX)
891 {
892 /* xgettext:c-format */
893 _bfd_error_handler (_("%B: invalid METAG reloc number: %d"), abfd, r_type);
894 r_type = 0;
895 }
896 cache_ptr->howto = & elf_metag_howto_table [r_type];
897 }
898
899 static reloc_howto_type *
900 metag_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
901 bfd_reloc_code_real_type code)
902 {
903 unsigned int i;
904
905 for (i = 0; i < sizeof (metag_reloc_map) / sizeof (metag_reloc_map[0]); i++)
906 if (metag_reloc_map [i].bfd_reloc_val == code)
907 return & elf_metag_howto_table [metag_reloc_map[i].metag_reloc_val];
908
909 return NULL;
910 }
911
912 static reloc_howto_type *
913 metag_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
914 const char *r_name)
915 {
916 unsigned int i;
917
918 for (i = 0; i < sizeof (elf_metag_howto_table) / sizeof (elf_metag_howto_table[0]); i++)
919 if (elf_metag_howto_table[i].name != NULL
920 && strcasecmp (elf_metag_howto_table[i].name, r_name) == 0)
921 return &elf_metag_howto_table[i];
922
923 return NULL;
924 }
925
926 /* Various hash macros and functions. */
927 #define metag_link_hash_table(p) \
928 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
929 == METAG_ELF_DATA ? ((struct elf_metag_link_hash_table *) ((p)->hash)) : NULL)
930
931 #define metag_elf_hash_entry(ent) \
932 ((struct elf_metag_link_hash_entry *)(ent))
933
934 #define metag_stub_hash_entry(ent) \
935 ((struct elf_metag_stub_hash_entry *)(ent))
936
937 #define metag_stub_hash_lookup(table, string, create, copy) \
938 ((struct elf_metag_stub_hash_entry *) \
939 bfd_hash_lookup ((table), (string), (create), (copy)))
940
941 #define metag_elf_local_got_tls_type(abfd) \
942 ((char *)(elf_local_got_offsets (abfd) + (elf_tdata (abfd)->symtab_hdr.sh_info)))
943
944 /* Assorted hash table functions. */
945
946 /* Initialize an entry in the stub hash table. */
947
948 static struct bfd_hash_entry *
949 stub_hash_newfunc (struct bfd_hash_entry *entry,
950 struct bfd_hash_table *table,
951 const char *string)
952 {
953 /* Allocate the structure if it has not already been allocated by a
954 subclass. */
955 if (entry == NULL)
956 {
957 entry = bfd_hash_allocate (table,
958 sizeof (struct elf_metag_stub_hash_entry));
959 if (entry == NULL)
960 return entry;
961 }
962
963 /* Call the allocation method of the superclass. */
964 entry = bfd_hash_newfunc (entry, table, string);
965 if (entry != NULL)
966 {
967 struct elf_metag_stub_hash_entry *hsh;
968
969 /* Initialize the local fields. */
970 hsh = (struct elf_metag_stub_hash_entry *) entry;
971 hsh->stub_sec = NULL;
972 hsh->stub_offset = 0;
973 hsh->target_value = 0;
974 hsh->target_section = NULL;
975 hsh->stub_type = metag_stub_long_branch;
976 hsh->hh = NULL;
977 hsh->id_sec = NULL;
978 }
979
980 return entry;
981 }
982
983 /* Initialize an entry in the link hash table. */
984
985 static struct bfd_hash_entry *
986 metag_link_hash_newfunc (struct bfd_hash_entry *entry,
987 struct bfd_hash_table *table,
988 const char *string)
989 {
990 /* Allocate the structure if it has not already been allocated by a
991 subclass. */
992 if (entry == NULL)
993 {
994 entry = bfd_hash_allocate (table,
995 sizeof (struct elf_metag_link_hash_entry));
996 if (entry == NULL)
997 return entry;
998 }
999
1000 /* Call the allocation method of the superclass. */
1001 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
1002 if (entry != NULL)
1003 {
1004 struct elf_metag_link_hash_entry *hh;
1005
1006 /* Initialize the local fields. */
1007 hh = (struct elf_metag_link_hash_entry *) entry;
1008 hh->hsh_cache = NULL;
1009 hh->dyn_relocs = NULL;
1010 hh->tls_type = GOT_UNKNOWN;
1011 }
1012
1013 return entry;
1014 }
1015
1016 /* Free the derived linker hash table. */
1017
1018 static void
1019 elf_metag_link_hash_table_free (bfd *obfd)
1020 {
1021 struct elf_metag_link_hash_table *htab
1022 = (struct elf_metag_link_hash_table *) obfd->link.hash;
1023
1024 bfd_hash_table_free (&htab->bstab);
1025 _bfd_elf_link_hash_table_free (obfd);
1026 }
1027
1028 /* Create the derived linker hash table. The Meta ELF port uses the derived
1029 hash table to keep information specific to the Meta ELF linker (without
1030 using static variables). */
1031
1032 static struct bfd_link_hash_table *
1033 elf_metag_link_hash_table_create (bfd *abfd)
1034 {
1035 struct elf_metag_link_hash_table *htab;
1036 bfd_size_type amt = sizeof (*htab);
1037
1038 htab = bfd_zmalloc (amt);
1039 if (htab == NULL)
1040 return NULL;
1041
1042 if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd,
1043 metag_link_hash_newfunc,
1044 sizeof (struct elf_metag_link_hash_entry),
1045 METAG_ELF_DATA))
1046 {
1047 free (htab);
1048 return NULL;
1049 }
1050
1051 /* Init the stub hash table too. */
1052 if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc,
1053 sizeof (struct elf_metag_stub_hash_entry)))
1054 {
1055 _bfd_elf_link_hash_table_free (abfd);
1056 return NULL;
1057 }
1058 htab->etab.root.hash_table_free = elf_metag_link_hash_table_free;
1059
1060 return &htab->etab.root;
1061 }
1062
1063 /* Section name for stubs is the associated section name plus this
1064 string. */
1065 #define STUB_SUFFIX ".stub"
1066
1067 /* Build a name for an entry in the stub hash table. */
1068
1069 static char *
1070 metag_stub_name (const asection *input_section,
1071 const asection *sym_sec,
1072 const struct elf_metag_link_hash_entry *hh,
1073 const Elf_Internal_Rela *rel)
1074 {
1075 char *stub_name;
1076 bfd_size_type len;
1077
1078 if (hh)
1079 {
1080 len = 8 + 1 + strlen (hh->eh.root.root.string) + 1 + 8 + 1;
1081 stub_name = bfd_malloc (len);
1082 if (stub_name != NULL)
1083 {
1084 sprintf (stub_name, "%08x_%s+%x",
1085 input_section->id & 0xffffffff,
1086 hh->eh.root.root.string,
1087 (int) rel->r_addend & 0xffffffff);
1088 }
1089 }
1090 else
1091 {
1092 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1;
1093 stub_name = bfd_malloc (len);
1094 if (stub_name != NULL)
1095 {
1096 sprintf (stub_name, "%08x_%x:%x+%x",
1097 input_section->id & 0xffffffff,
1098 sym_sec->id & 0xffffffff,
1099 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff,
1100 (int) rel->r_addend & 0xffffffff);
1101 }
1102 }
1103 return stub_name;
1104 }
1105
1106 /* Look up an entry in the stub hash. Stub entries are cached because
1107 creating the stub name takes a bit of time. */
1108
1109 static struct elf_metag_stub_hash_entry *
1110 metag_get_stub_entry (const asection *input_section,
1111 const asection *sym_sec,
1112 struct elf_metag_link_hash_entry *hh,
1113 const Elf_Internal_Rela *rel,
1114 struct elf_metag_link_hash_table *htab)
1115 {
1116 struct elf_metag_stub_hash_entry *hsh;
1117 const asection *id_sec;
1118
1119 /* If this input section is part of a group of sections sharing one
1120 stub section, then use the id of the first section in the group.
1121 Stub names need to include a section id, as there may well be
1122 more than one stub used to reach say, printf, and we need to
1123 distinguish between them. */
1124 id_sec = htab->stub_group[input_section->id].link_sec;
1125
1126 if (hh != NULL && hh->hsh_cache != NULL
1127 && hh->hsh_cache->hh == hh
1128 && hh->hsh_cache->id_sec == id_sec)
1129 {
1130 hsh = hh->hsh_cache;
1131 }
1132 else
1133 {
1134 char *stub_name;
1135
1136 stub_name = metag_stub_name (id_sec, sym_sec, hh, rel);
1137 if (stub_name == NULL)
1138 return NULL;
1139
1140 hsh = metag_stub_hash_lookup (&htab->bstab,
1141 stub_name, FALSE, FALSE);
1142
1143 if (hh != NULL)
1144 hh->hsh_cache = hsh;
1145
1146 free (stub_name);
1147 }
1148
1149 return hsh;
1150 }
1151
1152 /* Add a new stub entry to the stub hash. Not all fields of the new
1153 stub entry are initialised. */
1154
1155 static struct elf_metag_stub_hash_entry *
1156 metag_add_stub (const char *stub_name,
1157 asection *section,
1158 struct elf_metag_link_hash_table *htab)
1159 {
1160 asection *link_sec;
1161 asection *stub_sec;
1162 struct elf_metag_stub_hash_entry *hsh;
1163
1164 link_sec = htab->stub_group[section->id].link_sec;
1165 stub_sec = htab->stub_group[section->id].stub_sec;
1166 if (stub_sec == NULL)
1167 {
1168 stub_sec = htab->stub_group[link_sec->id].stub_sec;
1169 if (stub_sec == NULL)
1170 {
1171 size_t namelen;
1172 bfd_size_type len;
1173 char *s_name;
1174
1175 namelen = strlen (link_sec->name);
1176 len = namelen + sizeof (STUB_SUFFIX);
1177 s_name = bfd_alloc (htab->stub_bfd, len);
1178 if (s_name == NULL)
1179 return NULL;
1180
1181 memcpy (s_name, link_sec->name, namelen);
1182 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
1183
1184 stub_sec = (*htab->add_stub_section) (s_name, link_sec);
1185 if (stub_sec == NULL)
1186 return NULL;
1187 htab->stub_group[link_sec->id].stub_sec = stub_sec;
1188 }
1189 htab->stub_group[section->id].stub_sec = stub_sec;
1190 }
1191
1192 /* Enter this entry into the linker stub hash table. */
1193 hsh = metag_stub_hash_lookup (&htab->bstab, stub_name,
1194 TRUE, FALSE);
1195 if (hsh == NULL)
1196 {
1197 /* xgettext:c-format */
1198 _bfd_error_handler (_("%B: cannot create stub entry %s"),
1199 section->owner, stub_name);
1200 return NULL;
1201 }
1202
1203 hsh->stub_sec = stub_sec;
1204 hsh->stub_offset = 0;
1205 hsh->id_sec = link_sec;
1206 return hsh;
1207 }
1208
1209 /* Check a signed integer value can be represented in the given number
1210 of bits. */
1211
1212 static bfd_boolean
1213 within_signed_range (int value, unsigned int bits)
1214 {
1215 int min_val = -(1 << (bits - 1));
1216 int max_val = (1 << (bits - 1)) - 1;
1217 return (value <= max_val) && (value >= min_val);
1218 }
1219
1220 /* Perform a relocation as part of a final link. */
1221
1222 static bfd_reloc_status_type
1223 metag_final_link_relocate (reloc_howto_type *howto,
1224 bfd *input_bfd,
1225 asection *input_section,
1226 bfd_byte *contents,
1227 Elf_Internal_Rela *rel,
1228 bfd_vma relocation,
1229 struct elf_metag_link_hash_entry *hh,
1230 struct elf_metag_link_hash_table *htab,
1231 asection *sym_sec)
1232 {
1233 bfd_reloc_status_type r = bfd_reloc_ok;
1234 bfd_byte *hit_data = contents + rel->r_offset;
1235 int opcode, op_shift, op_extended, l1, l2;
1236 bfd_signed_vma srel, addend = rel->r_addend;
1237 struct elf_metag_stub_hash_entry *hsh = NULL;
1238 bfd_vma location;
1239
1240 /* Find out where we are and where we're going. */
1241 location = (rel->r_offset +
1242 input_section->output_offset +
1243 input_section->output_section->vma);
1244
1245 switch (howto->type)
1246 {
1247 case R_METAG_RELBRANCH:
1248 case R_METAG_RELBRANCH_PLT:
1249 /* Make it a pc relative offset. */
1250 relocation -= location;
1251 break;
1252 case R_METAG_TLS_GD:
1253 case R_METAG_TLS_IE:
1254 relocation -= elf_gp (input_section->output_section->owner);
1255 break;
1256 default:
1257 break;
1258 }
1259
1260 switch (howto->type)
1261 {
1262 case R_METAG_RELBRANCH_PLT:
1263 case R_METAG_RELBRANCH:
1264 opcode = bfd_get_32 (input_bfd, hit_data);
1265
1266 srel = (bfd_signed_vma) relocation;
1267 srel += addend;
1268
1269 /* If the branch is out of reach, then redirect the
1270 call to the local stub for this function. */
1271 if (srel > ((1 << (BRANCH_BITS + 1)) - 1) ||
1272 (srel < - (1 << (BRANCH_BITS + 1))))
1273 {
1274 if (sym_sec == NULL)
1275 break;
1276
1277 hsh = metag_get_stub_entry (input_section, sym_sec,
1278 hh, rel, htab);
1279 if (hsh == NULL)
1280 return bfd_reloc_undefined;
1281
1282 /* Munge up the value and addend so that we call the stub
1283 rather than the procedure directly. */
1284 srel = (hsh->stub_offset
1285 + hsh->stub_sec->output_offset
1286 + hsh->stub_sec->output_section->vma);
1287 srel -= location;
1288 }
1289
1290 srel = srel >> 2;
1291
1292 if (!within_signed_range (srel, BRANCH_BITS))
1293 {
1294 if (hh && hh->eh.root.type == bfd_link_hash_undefweak)
1295 srel = 0;
1296 else
1297 return bfd_reloc_overflow;
1298 }
1299
1300 opcode &= ~(0x7ffff << 5);
1301 opcode |= ((srel & 0x7ffff) << 5);
1302
1303 bfd_put_32 (input_bfd, opcode, hit_data);
1304 break;
1305 case R_METAG_GETSETOFF:
1306 case R_METAG_GETSET_GOT:
1307 case R_METAG_GETSET_GOTOFF:
1308 opcode = bfd_get_32 (input_bfd, hit_data);
1309
1310 srel = (bfd_signed_vma) relocation;
1311 srel += addend;
1312
1313 /* Is this a standard or extended GET/SET? */
1314 if ((opcode & 0xf0000000) == 0xa0000000)
1315 {
1316 /* Extended GET/SET. */
1317 l1 = opcode & 0x2;
1318 l2 = opcode & 0x4;
1319 op_extended = 1;
1320 }
1321 else
1322 {
1323 /* Standard GET/SET. */
1324 l1 = opcode & 0x01000000;
1325 l2 = opcode & 0x04000000;
1326 op_extended = 0;
1327 }
1328
1329 /* Calculate the width of the GET/SET and how much we need to
1330 shift the result by. */
1331 if (l2)
1332 if (l1)
1333 op_shift = 3;
1334 else
1335 op_shift = 2;
1336 else
1337 if (l1)
1338 op_shift = 1;
1339 else
1340 op_shift = 0;
1341
1342 /* GET/SET offsets are scaled by the width of the transfer. */
1343 srel = srel >> op_shift;
1344
1345 /* Extended GET/SET has signed 12 bits of offset, standard has
1346 signed 6 bits. */
1347 if (op_extended)
1348 {
1349 if (!within_signed_range (srel, 12))
1350 {
1351 if (hh && hh->eh.root.type == bfd_link_hash_undefweak)
1352 srel = 0;
1353 else
1354 return bfd_reloc_overflow;
1355 }
1356 opcode &= ~(0xfff << 7);
1357 opcode |= ((srel & 0xfff) << 7);
1358 }
1359 else
1360 {
1361 if (!within_signed_range (srel, 5))
1362 {
1363 if (hh && hh->eh.root.type == bfd_link_hash_undefweak)
1364 srel = 0;
1365 else
1366 return bfd_reloc_overflow;
1367 }
1368 opcode &= ~(0x3f << 8);
1369 opcode |= ((srel & 0x3f) << 8);
1370 }
1371
1372 bfd_put_32 (input_bfd, opcode, hit_data);
1373 break;
1374 case R_METAG_TLS_GD:
1375 case R_METAG_TLS_LDM:
1376 opcode = bfd_get_32 (input_bfd, hit_data);
1377
1378 if ((bfd_signed_vma)relocation < 0)
1379 {
1380 /* sign extend immediate */
1381 if ((opcode & 0xf2000001) == 0x02000000)
1382 {
1383 /* ADD De.e,Dx.r,#I16 */
1384 /* set SE bit */
1385 opcode |= (1 << 1);
1386 } else
1387 return bfd_reloc_overflow;
1388 }
1389
1390 bfd_put_32 (input_bfd, opcode, hit_data);
1391
1392 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1393 contents, rel->r_offset,
1394 relocation, rel->r_addend);
1395 break;
1396 default:
1397 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1398 contents, rel->r_offset,
1399 relocation, rel->r_addend);
1400 }
1401
1402 return r;
1403 }
1404
1405 /* This is defined because R_METAG_NONE != 0...
1406 See RELOC_AGAINST_DISCARDED_SECTION for details. */
1407 #define METAG_RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \
1408 rel, relend, howto, contents) \
1409 { \
1410 _bfd_clear_contents (howto, input_bfd, input_section, \
1411 contents + rel->r_offset); \
1412 \
1413 if (bfd_link_relocatable (info) \
1414 && (input_section->flags & SEC_DEBUGGING)) \
1415 { \
1416 /* Only remove relocations in debug sections since other \
1417 sections may require relocations. */ \
1418 Elf_Internal_Shdr *rel_hdr; \
1419 \
1420 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
1421 \
1422 /* Avoid empty output section. */ \
1423 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \
1424 { \
1425 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
1426 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \
1427 rel_hdr->sh_size -= rel_hdr->sh_entsize; \
1428 \
1429 memmove (rel, rel + 1, (relend - rel) * sizeof (*rel)); \
1430 \
1431 input_section->reloc_count--; \
1432 relend--; \
1433 rel--; \
1434 continue; \
1435 } \
1436 } \
1437 \
1438 rel->r_info = R_METAG_NONE; \
1439 rel->r_addend = 0; \
1440 continue; \
1441 }
1442
1443 /* Relocate a META ELF section.
1444
1445 The RELOCATE_SECTION function is called by the new ELF backend linker
1446 to handle the relocations for a section.
1447
1448 The relocs are always passed as Rela structures; if the section
1449 actually uses Rel structures, the r_addend field will always be
1450 zero.
1451
1452 This function is responsible for adjusting the section contents as
1453 necessary, and (if using Rela relocs and generating a relocatable
1454 output file) adjusting the reloc addend as necessary.
1455
1456 This function does not have to worry about setting the reloc
1457 address or the reloc symbol index.
1458
1459 LOCAL_SYMS is a pointer to the swapped in local symbols.
1460
1461 LOCAL_SECTIONS is an array giving the section in the input file
1462 corresponding to the st_shndx field of each local symbol.
1463
1464 The global hash table entry for the global symbols can be found
1465 via elf_sym_hashes (input_bfd).
1466
1467 When generating relocatable output, this function must handle
1468 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1469 going to be the section symbol corresponding to the output
1470 section, which means that the addend must be adjusted
1471 accordingly. */
1472
1473 static bfd_boolean
1474 elf_metag_relocate_section (bfd *output_bfd,
1475 struct bfd_link_info *info,
1476 bfd *input_bfd,
1477 asection *input_section,
1478 bfd_byte *contents,
1479 Elf_Internal_Rela *relocs,
1480 Elf_Internal_Sym *local_syms,
1481 asection **local_sections)
1482 {
1483 bfd_vma *local_got_offsets;
1484 Elf_Internal_Shdr *symtab_hdr;
1485 struct elf_link_hash_entry **eh_syms;
1486 struct elf_metag_link_hash_table *htab;
1487 Elf_Internal_Rela *rel;
1488 Elf_Internal_Rela *relend;
1489 asection *sreloc;
1490
1491 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
1492 eh_syms = elf_sym_hashes (input_bfd);
1493 relend = relocs + input_section->reloc_count;
1494
1495 htab = metag_link_hash_table (info);
1496 local_got_offsets = elf_local_got_offsets (input_bfd);
1497
1498 sreloc = NULL;
1499
1500 for (rel = relocs; rel < relend; rel ++)
1501 {
1502 reloc_howto_type *howto;
1503 unsigned long r_symndx;
1504 Elf_Internal_Sym *sym;
1505 asection *sec;
1506 struct elf_metag_link_hash_entry *hh;
1507 bfd_vma relocation;
1508 bfd_reloc_status_type r;
1509 const char *name;
1510 int r_type;
1511
1512 r_type = ELF32_R_TYPE (rel->r_info);
1513
1514 if (r_type == R_METAG_GNU_VTINHERIT
1515 || r_type == R_METAG_GNU_VTENTRY
1516 || r_type == R_METAG_NONE)
1517 continue;
1518
1519 r_symndx = ELF32_R_SYM (rel->r_info);
1520
1521 howto = elf_metag_howto_table + ELF32_R_TYPE (rel->r_info);
1522 hh = NULL;
1523 sym = NULL;
1524 sec = NULL;
1525
1526 if (r_symndx < symtab_hdr->sh_info)
1527 {
1528 sym = local_syms + r_symndx;
1529 sec = local_sections [r_symndx];
1530 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1531
1532 name = bfd_elf_string_from_elf_section
1533 (input_bfd, symtab_hdr->sh_link, sym->st_name);
1534 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
1535 }
1536 else
1537 {
1538 struct elf_link_hash_entry *eh;
1539 bfd_boolean unresolved_reloc, warned, ignored;
1540
1541 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1542 r_symndx, symtab_hdr, eh_syms,
1543 eh, sec, relocation,
1544 unresolved_reloc, warned, ignored);
1545
1546 name = eh->root.root.string;
1547 hh = (struct elf_metag_link_hash_entry *) eh;
1548 }
1549
1550 if (sec != NULL && discarded_section (sec))
1551 METAG_RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1552 rel, relend, howto, contents);
1553
1554 if (bfd_link_relocatable (info))
1555 continue;
1556
1557 switch (r_type)
1558 {
1559 case R_METAG_ADDR32:
1560 case R_METAG_RELBRANCH:
1561 if ((input_section->flags & SEC_ALLOC) == 0)
1562 break;
1563
1564 if ((bfd_link_pic (info)
1565 && r_symndx != STN_UNDEF
1566 && (input_section->flags & SEC_ALLOC) != 0
1567 && (r_type != R_METAG_RELBRANCH
1568 || !SYMBOL_CALLS_LOCAL (info, &hh->eh)))
1569 || (!bfd_link_pic (info)
1570 && hh != NULL
1571 && hh->eh.dynindx != -1
1572 && !hh->eh.non_got_ref
1573 && ((hh->eh.def_dynamic
1574 && !hh->eh.def_regular)
1575 || hh->eh.root.type == bfd_link_hash_undefweak
1576 || hh->eh.root.type == bfd_link_hash_undefined)))
1577 {
1578 Elf_Internal_Rela outrel;
1579 bfd_boolean skip, relocate;
1580 bfd_byte *loc;
1581
1582 /* When generating a shared object, these relocations
1583 are copied into the output file to be resolved at run
1584 time. */
1585
1586 sreloc = elf_section_data (input_section)->sreloc;
1587 BFD_ASSERT (sreloc != NULL);
1588
1589 skip = FALSE;
1590 relocate = FALSE;
1591
1592 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
1593 info,
1594 input_section,
1595 rel->r_offset);
1596 if (outrel.r_offset == (bfd_vma) -1)
1597 skip = TRUE;
1598 else if (outrel.r_offset == (bfd_vma) -2)
1599 skip = TRUE, relocate = TRUE;
1600 outrel.r_offset += (input_section->output_section->vma
1601 + input_section->output_offset);
1602
1603 if (skip)
1604 {
1605 memset (&outrel, 0, sizeof outrel);
1606 outrel.r_info = ELF32_R_INFO (0, R_METAG_NONE);
1607 }
1608 else if (r_type == R_METAG_RELBRANCH)
1609 {
1610 BFD_ASSERT (hh != NULL && 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 else
1615 {
1616 /* h->dynindx may be -1 if this symbol was marked to
1617 become local. */
1618 if (hh == NULL
1619 || ((info->symbolic || hh->eh.dynindx == -1)
1620 && hh->eh.def_regular))
1621 {
1622 relocate = TRUE;
1623 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE);
1624 outrel.r_addend = relocation + rel->r_addend;
1625 }
1626 else
1627 {
1628 BFD_ASSERT (hh->eh.dynindx != -1);
1629 outrel.r_info = ELF32_R_INFO (hh->eh.dynindx, r_type);
1630 outrel.r_addend = rel->r_addend;
1631 }
1632 }
1633
1634 loc = sreloc->contents;
1635 loc += sreloc->reloc_count * sizeof(Elf32_External_Rela);
1636 bfd_elf32_swap_reloca_out (output_bfd, &outrel,loc);
1637 ++sreloc->reloc_count;
1638
1639 /* If this reloc is against an external symbol, we do
1640 not want to fiddle with the addend. Otherwise, we
1641 need to include the symbol value so that it becomes
1642 an addend for the dynamic reloc. */
1643 if (! relocate)
1644 continue;
1645 }
1646 break;
1647
1648 case R_METAG_RELBRANCH_PLT:
1649 /* Relocation is to the entry for this symbol in the
1650 procedure linkage table. */
1651
1652 if (hh == NULL)
1653 break;
1654
1655 if (hh->eh.forced_local)
1656 break;
1657
1658 if (hh->eh.plt.offset == (bfd_vma) -1 || htab->etab.splt == NULL)
1659 {
1660 /* We didn't make a PLT entry for this symbol. This
1661 happens when statically linking PIC code, or when
1662 using -Bsymbolic. */
1663 break;
1664 }
1665
1666 relocation = (htab->etab.splt->output_section->vma
1667 + htab->etab.splt->output_offset
1668 + hh->eh.plt.offset);
1669 break;
1670 case R_METAG_HI16_GOTPC:
1671 case R_METAG_LO16_GOTPC:
1672 BFD_ASSERT (htab->etab.sgot != NULL);
1673
1674 relocation = (htab->etab.sgot->output_section->vma +
1675 htab->etab.sgot->output_offset);
1676 relocation += GOT_REG_OFFSET;
1677 relocation -= (input_section->output_section->vma
1678 + input_section->output_offset
1679 + rel->r_offset);
1680 break;
1681 case R_METAG_HI16_GOTOFF:
1682 case R_METAG_LO16_GOTOFF:
1683 case R_METAG_GETSET_GOTOFF:
1684 BFD_ASSERT (htab->etab.sgot != NULL);
1685
1686 relocation -= (htab->etab.sgot->output_section->vma +
1687 htab->etab.sgot->output_offset);
1688 relocation -= GOT_REG_OFFSET;
1689 break;
1690 case R_METAG_GETSET_GOT:
1691 {
1692 bfd_vma off;
1693 bfd_boolean do_got = 0;
1694
1695 /* Relocation is to the entry for this symbol in the
1696 global offset table. */
1697 if (hh != NULL)
1698 {
1699 bfd_boolean dyn;
1700
1701 off = hh->eh.got.offset;
1702 dyn = htab->etab.dynamic_sections_created;
1703 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
1704 bfd_link_pic (info),
1705 &hh->eh))
1706 {
1707 /* If we aren't going to call finish_dynamic_symbol,
1708 then we need to handle initialisation of the .got
1709 entry and create needed relocs here. Since the
1710 offset must always be a multiple of 4, we use the
1711 least significant bit to record whether we have
1712 initialised it already. */
1713 if ((off & 1) != 0)
1714 off &= ~1;
1715 else
1716 {
1717 hh->eh.got.offset |= 1;
1718 do_got = 1;
1719 }
1720 }
1721 }
1722 else
1723 {
1724 /* Local symbol case. */
1725 if (local_got_offsets == NULL)
1726 abort ();
1727
1728 off = local_got_offsets[r_symndx];
1729
1730 /* The offset must always be a multiple of 4. We use
1731 the least significant bit to record whether we have
1732 already generated the necessary reloc. */
1733 if ((off & 1) != 0)
1734 off &= ~1;
1735 else
1736 {
1737 local_got_offsets[r_symndx] |= 1;
1738 do_got = 1;
1739 }
1740 }
1741
1742 if (do_got)
1743 {
1744 if (bfd_link_pic (info))
1745 {
1746 /* Output a dynamic relocation for this GOT entry.
1747 In this case it is relative to the base of the
1748 object because the symbol index is zero. */
1749 Elf_Internal_Rela outrel;
1750 bfd_byte *loc;
1751 asection *s = htab->etab.srelgot;
1752
1753 outrel.r_offset = (off
1754 + htab->etab.sgot->output_offset
1755 + htab->etab.sgot->output_section->vma);
1756 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE);
1757 outrel.r_addend = relocation;
1758 loc = s->contents;
1759 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1760 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1761 }
1762 else
1763 bfd_put_32 (output_bfd, relocation,
1764 htab->etab.sgot->contents + off);
1765 }
1766
1767 if (off >= (bfd_vma) -2)
1768 abort ();
1769
1770 relocation = off - GOT_REG_OFFSET;
1771 }
1772 break;
1773 case R_METAG_TLS_GD:
1774 case R_METAG_TLS_IE:
1775 {
1776 /* XXXMJF There is room here for optimisations. For example
1777 converting from GD->IE, etc. */
1778 bfd_vma off;
1779 int indx;
1780 char tls_type;
1781
1782 if (htab->etab.sgot == NULL)
1783 abort();
1784
1785 indx = 0;
1786 if (hh != NULL)
1787 {
1788 bfd_boolean dyn;
1789 dyn = htab->etab.dynamic_sections_created;
1790
1791 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
1792 bfd_link_pic (info),
1793 &hh->eh)
1794 && (!bfd_link_pic (info)
1795 || !SYMBOL_REFERENCES_LOCAL (info, &hh->eh)))
1796 {
1797 indx = hh->eh.dynindx;
1798 }
1799 off = hh->eh.got.offset;
1800 tls_type = hh->tls_type;
1801 }
1802 else
1803 {
1804 /* Local symbol case. */
1805 if (local_got_offsets == NULL)
1806 abort ();
1807
1808 off = local_got_offsets[r_symndx];
1809 tls_type = metag_elf_local_got_tls_type (input_bfd) [r_symndx];
1810 }
1811
1812 if (tls_type == GOT_UNKNOWN)
1813 abort ();
1814
1815 if ((off & 1) != 0)
1816 off &= ~1;
1817 else
1818 {
1819 bfd_boolean need_relocs = FALSE;
1820 Elf_Internal_Rela outrel;
1821 bfd_byte *loc = NULL;
1822 int cur_off = off;
1823
1824 /* The GOT entries have not been initialized yet. Do it
1825 now, and emit any relocations. If both an IE GOT and a
1826 GD GOT are necessary, we emit the GD first. */
1827
1828 if ((bfd_link_pic (info) || indx != 0)
1829 && (hh == NULL
1830 || ELF_ST_VISIBILITY (hh->eh.other) == STV_DEFAULT
1831 || hh->eh.root.type != bfd_link_hash_undefweak))
1832 {
1833 need_relocs = TRUE;
1834 loc = htab->etab.srelgot->contents;
1835 /* FIXME (CAO): Should this be reloc_count++ ? */
1836 loc += htab->etab.srelgot->reloc_count * sizeof (Elf32_External_Rela);
1837 }
1838
1839 if (tls_type & GOT_TLS_GD)
1840 {
1841 if (need_relocs)
1842 {
1843 outrel.r_offset = (cur_off
1844 + htab->etab.sgot->output_section->vma
1845 + htab->etab.sgot->output_offset);
1846 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_DTPMOD);
1847 outrel.r_addend = 0;
1848 bfd_put_32 (output_bfd, 0, htab->etab.sgot->contents + cur_off);
1849
1850 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1851 htab->etab.srelgot->reloc_count++;
1852 loc += sizeof (Elf32_External_Rela);
1853
1854 if (indx == 0)
1855 bfd_put_32 (output_bfd, 0,
1856 htab->etab.sgot->contents + cur_off + 4);
1857 else
1858 {
1859 bfd_put_32 (output_bfd, 0,
1860 htab->etab.sgot->contents + cur_off + 4);
1861 outrel.r_info = ELF32_R_INFO (indx,
1862 R_METAG_TLS_DTPOFF);
1863 outrel.r_offset += 4;
1864 bfd_elf32_swap_reloca_out (output_bfd,
1865 &outrel, loc);
1866 htab->etab.srelgot->reloc_count++;
1867 loc += sizeof (Elf32_External_Rela);
1868 }
1869 }
1870 else
1871 {
1872 /* We don't support changing the TLS model. */
1873 /* PR 20675 */
1874 if (bfd_link_pic (info))
1875 _bfd_error_handler (_("%B(%A): multiple TLS models are not supported"),
1876 input_bfd, input_section);
1877 else
1878 _bfd_error_handler (_("%B(%A): shared library symbol %s encountered whilst performing a static link"),
1879 input_bfd, input_section, name);
1880 return FALSE;
1881 }
1882
1883 cur_off += 8;
1884 }
1885
1886 if (tls_type & GOT_TLS_IE)
1887 {
1888 if (need_relocs)
1889 {
1890 outrel.r_offset = (cur_off
1891 + htab->etab.sgot->output_section->vma
1892 + htab->etab.sgot->output_offset);
1893 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_TPOFF);
1894
1895 if (indx == 0)
1896 outrel.r_addend = relocation - dtpoff_base (info);
1897 else
1898 outrel.r_addend = 0;
1899
1900 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1901 htab->etab.srelgot->reloc_count++;
1902 loc += sizeof (Elf32_External_Rela);
1903 }
1904 else
1905 bfd_put_32 (output_bfd, tpoff (info, relocation),
1906 htab->etab.sgot->contents + cur_off);
1907
1908 cur_off += 4;
1909 }
1910
1911 if (hh != NULL)
1912 hh->eh.got.offset |= 1;
1913 else
1914 local_got_offsets[r_symndx] |= 1;
1915 }
1916
1917 /* Add the base of the GOT to the relocation value. */
1918 relocation = off - GOT_REG_OFFSET;
1919
1920 break;
1921 }
1922
1923 case R_METAG_TLS_IENONPIC_HI16:
1924 case R_METAG_TLS_IENONPIC_LO16:
1925 case R_METAG_TLS_LE_HI16:
1926 case R_METAG_TLS_LE_LO16:
1927 if (bfd_link_pic (info))
1928 {
1929 _bfd_error_handler
1930 /* xgettext:c-format */
1931 (_("%B(%A+%#Lx): %s relocation not permitted in shared object"),
1932 input_bfd, input_section, rel->r_offset, howto->name);
1933 return FALSE;
1934 }
1935 else
1936 relocation = tpoff (info, relocation);
1937 break;
1938 case R_METAG_TLS_LDO_HI16:
1939 case R_METAG_TLS_LDO_LO16:
1940 if (! bfd_link_pic (info))
1941 relocation = tpoff (info, relocation);
1942 else
1943 relocation -= dtpoff_base (info);
1944 break;
1945 case R_METAG_TLS_LDM:
1946 {
1947 bfd_vma off;
1948
1949 if (htab->etab.sgot == NULL)
1950 abort();
1951 off = htab->tls_ldm_got.offset;
1952 if (off & 1)
1953 off &= ~1;
1954 else
1955 {
1956 Elf_Internal_Rela outrel;
1957 bfd_byte *loc;
1958
1959 outrel.r_offset = (off
1960 + htab->etab.sgot->output_section->vma
1961 + htab->etab.sgot->output_offset);
1962
1963 outrel.r_addend = 0;
1964 outrel.r_info = ELF32_R_INFO (0, R_METAG_TLS_DTPMOD);
1965 loc = htab->etab.srelgot->contents;
1966 loc += htab->etab.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
1967 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1968 htab->tls_ldm_got.offset |= 1;
1969 }
1970
1971 relocation = off - GOT_REG_OFFSET;
1972 break;
1973 }
1974 default:
1975 break;
1976 }
1977
1978 r = metag_final_link_relocate (howto, input_bfd, input_section,
1979 contents, rel, relocation, hh, htab,
1980 sec);
1981
1982 if (r != bfd_reloc_ok)
1983 {
1984 const char * msg = (const char *) NULL;
1985
1986 switch (r)
1987 {
1988 case bfd_reloc_overflow:
1989 (*info->callbacks->reloc_overflow)
1990 (info, (hh ? &hh->eh.root : NULL), name, howto->name,
1991 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1992 break;
1993
1994 case bfd_reloc_undefined:
1995 (*info->callbacks->undefined_symbol)
1996 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
1997 break;
1998
1999 case bfd_reloc_outofrange:
2000 msg = _("internal error: out of range error");
2001 break;
2002
2003 case bfd_reloc_notsupported:
2004 msg = _("internal error: unsupported relocation error");
2005 break;
2006
2007 case bfd_reloc_dangerous:
2008 msg = _("internal error: dangerous relocation");
2009 break;
2010
2011 default:
2012 msg = _("internal error: unknown error");
2013 break;
2014 }
2015
2016 if (msg)
2017 (*info->callbacks->warning) (info, msg, name, input_bfd,
2018 input_section, rel->r_offset);
2019 }
2020 }
2021
2022 return TRUE;
2023 }
2024
2025 /* Create the .plt and .got sections, and set up our hash table
2026 short-cuts to various dynamic sections. */
2027
2028 static bfd_boolean
2029 elf_metag_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
2030 {
2031 struct elf_metag_link_hash_table *htab;
2032 struct elf_link_hash_entry *eh;
2033 struct bfd_link_hash_entry *bh;
2034 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2035
2036 /* Don't try to create the .plt and .got twice. */
2037 htab = metag_link_hash_table (info);
2038 if (htab->etab.splt != NULL)
2039 return TRUE;
2040
2041 /* Call the generic code to do most of the work. */
2042 if (! _bfd_elf_create_dynamic_sections (abfd, info))
2043 return FALSE;
2044
2045 /* The header goes at the start of the dynamic .got section, which
2046 is placed after the dynamic .got.plt section. ie. The header is
2047 not necessarily at the start of the output .got section. */
2048 htab->etab.sgot->size += 12;
2049
2050 /* Define the symbol __GLOBAL_OFFSET_TABLE__ on the header. */
2051 bh = NULL;
2052 if (!(_bfd_generic_link_add_one_symbol
2053 (info, abfd, "__GLOBAL_OFFSET_TABLE__", BSF_GLOBAL, htab->etab.sgot,
2054 (bfd_vma) 0, NULL, FALSE, bed->collect, &bh)))
2055 return FALSE;
2056 eh = (struct elf_link_hash_entry *) bh;
2057 eh->def_regular = 1;
2058 eh->type = STT_OBJECT;
2059 eh->other = STV_HIDDEN;
2060
2061 if (! bfd_link_executable (info)
2062 && ! bfd_elf_link_record_dynamic_symbol (info, eh))
2063 return FALSE;
2064
2065 htab->etab.hgot = eh;
2066
2067 return TRUE;
2068 }
2069
2070 /* Look through the relocs for a section during the first phase, and
2071 calculate needed space in the global offset table, procedure linkage
2072 table, and dynamic reloc sections. At this point we haven't
2073 necessarily read all the input files. */
2074
2075 static bfd_boolean
2076 elf_metag_check_relocs (bfd *abfd,
2077 struct bfd_link_info *info,
2078 asection *sec,
2079 const Elf_Internal_Rela *relocs)
2080 {
2081 Elf_Internal_Shdr *symtab_hdr;
2082 struct elf_link_hash_entry **eh_syms;
2083 const Elf_Internal_Rela *rel;
2084 const Elf_Internal_Rela *rel_end;
2085 struct elf_metag_link_hash_table *htab;
2086 asection *sreloc;
2087 bfd *dynobj;
2088 int tls_type = GOT_UNKNOWN, old_tls_type = GOT_UNKNOWN;
2089
2090 if (bfd_link_relocatable (info))
2091 return TRUE;
2092
2093 htab = metag_link_hash_table (info);
2094 dynobj = htab->etab.dynobj;
2095 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2096 eh_syms = elf_sym_hashes (abfd);
2097 sreloc = NULL;
2098
2099 if (htab == NULL)
2100 return FALSE;
2101
2102 rel_end = relocs + sec->reloc_count;
2103 for (rel = relocs; rel < rel_end; rel++)
2104 {
2105 int r_type;
2106 struct elf_metag_link_hash_entry *hh;
2107 Elf_Internal_Sym *isym;
2108 unsigned long r_symndx;
2109
2110 r_symndx = ELF32_R_SYM (rel->r_info);
2111 r_type = ELF32_R_TYPE (rel->r_info);
2112 if (r_symndx < symtab_hdr->sh_info)
2113 {
2114 /* A local symbol. */
2115 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2116 abfd, r_symndx);
2117 if (isym == NULL)
2118 return FALSE;
2119
2120 hh = NULL;
2121 }
2122 else
2123 {
2124 isym = NULL;
2125
2126 hh = (struct elf_metag_link_hash_entry *)
2127 eh_syms[r_symndx - symtab_hdr->sh_info];
2128 while (hh->eh.root.type == bfd_link_hash_indirect
2129 || hh->eh.root.type == bfd_link_hash_warning)
2130 hh = (struct elf_metag_link_hash_entry *) hh->eh.root.u.i.link;
2131
2132 /* PR15323, ref flags aren't set for references in the same
2133 object. */
2134 hh->eh.root.non_ir_ref_regular = 1;
2135 }
2136
2137 /* Some relocs require a global offset table. */
2138 if (htab->etab.sgot == NULL)
2139 {
2140 switch (r_type)
2141 {
2142 case R_METAG_TLS_GD:
2143 case R_METAG_TLS_LDM:
2144 case R_METAG_TLS_IE:
2145 if (bfd_link_pic (info))
2146 info->flags |= DF_STATIC_TLS;
2147 /* Fall through. */
2148
2149 case R_METAG_HI16_GOTOFF:
2150 case R_METAG_LO16_GOTOFF:
2151 case R_METAG_GETSET_GOTOFF:
2152 case R_METAG_GETSET_GOT:
2153 case R_METAG_HI16_GOTPC:
2154 case R_METAG_LO16_GOTPC:
2155 if (dynobj == NULL)
2156 htab->etab.dynobj = dynobj = abfd;
2157 if (!elf_metag_create_dynamic_sections (dynobj, info))
2158 return FALSE;
2159 break;
2160
2161 default:
2162 break;
2163 }
2164 }
2165
2166 switch (r_type)
2167 {
2168 case R_METAG_TLS_IE:
2169 case R_METAG_TLS_GD:
2170 case R_METAG_GETSET_GOT:
2171 switch (r_type)
2172 {
2173 default:
2174 tls_type = GOT_NORMAL;
2175 break;
2176 case R_METAG_TLS_IE:
2177 tls_type = GOT_TLS_IE;
2178 break;
2179 case R_METAG_TLS_GD:
2180 tls_type = GOT_TLS_GD;
2181 break;
2182 }
2183
2184 if (hh != NULL)
2185 {
2186 hh->eh.got.refcount += 1;
2187 old_tls_type = hh->tls_type;
2188 }
2189 else
2190 {
2191 bfd_signed_vma *local_got_refcounts;
2192
2193 /* This is a global offset table entry for a local
2194 symbol. */
2195 local_got_refcounts = elf_local_got_refcounts (abfd);
2196 if (local_got_refcounts == NULL)
2197 {
2198 bfd_size_type size;
2199
2200 size = symtab_hdr->sh_info;
2201 size *= sizeof (bfd_signed_vma);
2202 /* Add in space to store the local GOT TLS types. */
2203 size += symtab_hdr->sh_info;
2204 local_got_refcounts = ((bfd_signed_vma *)
2205 bfd_zalloc (abfd, size));
2206 if (local_got_refcounts == NULL)
2207 return FALSE;
2208 elf_local_got_refcounts (abfd) = local_got_refcounts;
2209 memset (metag_elf_local_got_tls_type (abfd),
2210 GOT_UNKNOWN, symtab_hdr->sh_info);
2211 }
2212 local_got_refcounts[r_symndx] += 1;
2213 old_tls_type = metag_elf_local_got_tls_type (abfd) [r_symndx];
2214 }
2215
2216 if (old_tls_type != tls_type)
2217 {
2218 if (hh != NULL)
2219 {
2220 hh->tls_type = tls_type;
2221 }
2222 else
2223 {
2224 metag_elf_local_got_tls_type (abfd) [r_symndx] = tls_type;
2225 }
2226 }
2227
2228 break;
2229
2230 case R_METAG_TLS_LDM:
2231 metag_link_hash_table (info)->tls_ldm_got.refcount += 1;
2232 break;
2233
2234 case R_METAG_RELBRANCH_PLT:
2235 /* This symbol requires a procedure linkage table entry. We
2236 actually build the entry in adjust_dynamic_symbol,
2237 because this might be a case of linking PIC code without
2238 linking in any dynamic objects, in which case we don't
2239 need to generate a procedure linkage table after all. */
2240
2241 /* If this is a local symbol, we resolve it directly without
2242 creating a procedure linkage table entry. */
2243 if (hh == NULL)
2244 continue;
2245
2246 if (hh->eh.forced_local)
2247 break;
2248
2249 hh->eh.needs_plt = 1;
2250 hh->eh.plt.refcount += 1;
2251 break;
2252
2253 case R_METAG_HIADDR16:
2254 case R_METAG_LOADDR16:
2255 /* Let's help debug shared library creation. These relocs
2256 cannot be used in shared libs. Don't error out for
2257 sections we don't care about, such as debug sections or
2258 non-constant sections. */
2259 if (bfd_link_pic (info)
2260 && (sec->flags & SEC_ALLOC) != 0
2261 && (sec->flags & SEC_READONLY) != 0)
2262 {
2263 const char *name;
2264
2265 if (hh)
2266 name = hh->eh.root.root.string;
2267 else
2268 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2269 _bfd_error_handler
2270 /* xgettext:c-format */
2271 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
2272 abfd, elf_metag_howto_table[r_type].name, name);
2273 bfd_set_error (bfd_error_bad_value);
2274 return FALSE;
2275 }
2276
2277 /* Fall through. */
2278 case R_METAG_ADDR32:
2279 case R_METAG_RELBRANCH:
2280 case R_METAG_GETSETOFF:
2281 if (hh != NULL && !bfd_link_pic (info))
2282 {
2283 hh->eh.non_got_ref = 1;
2284 hh->eh.plt.refcount += 1;
2285 }
2286
2287 /* If we are creating a shared library, and this is a reloc
2288 against a global symbol, or a non PC relative reloc
2289 against a local symbol, then we need to copy the reloc
2290 into the shared library. However, if we are linking with
2291 -Bsymbolic, we do not need to copy a reloc against a
2292 global symbol which is defined in an object we are
2293 including in the link (i.e., DEF_REGULAR is set). At
2294 this point we have not seen all the input files, so it is
2295 possible that DEF_REGULAR is not set now but will be set
2296 later (it is never cleared). We account for that
2297 possibility below by storing information in the
2298 dyn_relocs field of the hash table entry. A similar
2299 situation occurs when creating shared libraries and symbol
2300 visibility changes render the symbol local.
2301
2302 If on the other hand, we are creating an executable, we
2303 may need to keep relocations for symbols satisfied by a
2304 dynamic library if we manage to avoid copy relocs for the
2305 symbol. */
2306 if ((bfd_link_pic (info)
2307 && (sec->flags & SEC_ALLOC) != 0
2308 && (r_type != R_METAG_RELBRANCH
2309 || (hh != NULL
2310 && (! info->symbolic
2311 || hh->eh.root.type == bfd_link_hash_defweak
2312 || !hh->eh.def_regular))))
2313 || (!bfd_link_pic (info)
2314 && (sec->flags & SEC_ALLOC) != 0
2315 && hh != NULL
2316 && (hh->eh.root.type == bfd_link_hash_defweak
2317 || !hh->eh.def_regular)))
2318 {
2319 struct elf_metag_dyn_reloc_entry *hdh_p;
2320 struct elf_metag_dyn_reloc_entry **hdh_head;
2321
2322 if (dynobj == NULL)
2323 htab->etab.dynobj = dynobj = abfd;
2324
2325 /* When creating a shared object, we must copy these
2326 relocs into the output file. We create a reloc
2327 section in dynobj and make room for the reloc. */
2328 if (sreloc == NULL)
2329 {
2330 sreloc = _bfd_elf_make_dynamic_reloc_section
2331 (sec, htab->etab.dynobj, 2, abfd, /*rela?*/ TRUE);
2332
2333 if (sreloc == NULL)
2334 {
2335 bfd_set_error (bfd_error_bad_value);
2336 return FALSE;
2337 }
2338
2339 elf_section_data (sec)->sreloc = sreloc;
2340 }
2341
2342 /* If this is a global symbol, we count the number of
2343 relocations we need for this symbol. */
2344 if (hh != NULL)
2345 hdh_head = &((struct elf_metag_link_hash_entry *) hh)->dyn_relocs;
2346 else
2347 {
2348 /* Track dynamic relocs needed for local syms too. */
2349 asection *sr;
2350 void *vpp;
2351
2352 sr = bfd_section_from_elf_index (abfd, isym->st_shndx);
2353 if (sr == NULL)
2354 sr = sec;
2355
2356 vpp = &elf_section_data (sr)->local_dynrel;
2357 hdh_head = (struct elf_metag_dyn_reloc_entry **) vpp;
2358 }
2359
2360 hdh_p = *hdh_head;
2361 if (hdh_p == NULL || hdh_p->sec != sec)
2362 {
2363 hdh_p = ((struct elf_metag_dyn_reloc_entry *)
2364 bfd_alloc (dynobj, sizeof *hdh_p));
2365 if (hdh_p == NULL)
2366 return FALSE;
2367 hdh_p->hdh_next = *hdh_head;
2368 *hdh_head = hdh_p;
2369 hdh_p->sec = sec;
2370 hdh_p->count = 0;
2371 hdh_p->relative_count = 0;
2372 }
2373
2374 hdh_p->count += 1;
2375 if (ELF32_R_TYPE (rel->r_info) == R_METAG_RELBRANCH)
2376 hdh_p->relative_count += 1;
2377 }
2378 break;
2379
2380 /* This relocation describes the C++ object vtable hierarchy.
2381 Reconstruct it for later use during GC. */
2382 case R_METAG_GNU_VTINHERIT:
2383 if (!bfd_elf_gc_record_vtinherit (abfd, sec, &hh->eh,
2384 rel->r_offset))
2385 return FALSE;
2386 break;
2387
2388 /* This relocation describes which C++ vtable entries are actually
2389 used. Record for later use during GC. */
2390 case R_METAG_GNU_VTENTRY:
2391 BFD_ASSERT (hh != NULL);
2392 if (hh != NULL
2393 && !bfd_elf_gc_record_vtentry (abfd, sec, &hh->eh, rel->r_addend))
2394 return FALSE;
2395 break;
2396 }
2397 }
2398
2399 return TRUE;
2400 }
2401
2402 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2403
2404 static void
2405 elf_metag_copy_indirect_symbol (struct bfd_link_info *info,
2406 struct elf_link_hash_entry *eh_dir,
2407 struct elf_link_hash_entry *eh_ind)
2408 {
2409 struct elf_metag_link_hash_entry *hh_dir, *hh_ind;
2410
2411 hh_dir = metag_elf_hash_entry (eh_dir);
2412 hh_ind = metag_elf_hash_entry (eh_ind);
2413
2414 if (hh_ind->dyn_relocs != NULL)
2415 {
2416 if (hh_dir->dyn_relocs != NULL)
2417 {
2418 struct elf_metag_dyn_reloc_entry **hdh_pp;
2419 struct elf_metag_dyn_reloc_entry *hdh_p;
2420
2421 if (eh_ind->root.type == bfd_link_hash_indirect)
2422 abort ();
2423
2424 /* Add reloc counts against the weak sym to the strong sym
2425 list. Merge any entries against the same section. */
2426 for (hdh_pp = &hh_ind->dyn_relocs; (hdh_p = *hdh_pp) != NULL; )
2427 {
2428 struct elf_metag_dyn_reloc_entry *hdh_q;
2429
2430 for (hdh_q = hh_dir->dyn_relocs; hdh_q != NULL;
2431 hdh_q = hdh_q->hdh_next)
2432 if (hdh_q->sec == hdh_p->sec)
2433 {
2434 hdh_q->relative_count += hdh_p->relative_count;
2435 hdh_q->count += hdh_p->count;
2436 *hdh_pp = hdh_p->hdh_next;
2437 break;
2438 }
2439 if (hdh_q == NULL)
2440 hdh_pp = &hdh_p->hdh_next;
2441 }
2442 *hdh_pp = hh_dir->dyn_relocs;
2443 }
2444
2445 hh_dir->dyn_relocs = hh_ind->dyn_relocs;
2446 hh_ind->dyn_relocs = NULL;
2447 }
2448
2449 if (eh_ind->root.type == bfd_link_hash_indirect
2450 && eh_dir->got.refcount <= 0)
2451 {
2452 hh_dir->tls_type = hh_ind->tls_type;
2453 hh_ind->tls_type = GOT_UNKNOWN;
2454 }
2455
2456 _bfd_elf_link_hash_copy_indirect (info, eh_dir, eh_ind);
2457 }
2458
2459 /* Adjust a symbol defined by a dynamic object and referenced by a
2460 regular object. The current definition is in some section of the
2461 dynamic object, but we're not including those sections. We have to
2462 change the definition to something the rest of the link can
2463 understand. */
2464
2465 static bfd_boolean
2466 elf_metag_adjust_dynamic_symbol (struct bfd_link_info *info,
2467 struct elf_link_hash_entry *eh)
2468 {
2469 struct elf_metag_link_hash_table *htab;
2470 struct elf_metag_link_hash_entry *hh;
2471 struct elf_metag_dyn_reloc_entry *hdh_p;
2472 asection *s, *srel;
2473
2474 /* If this is a function, put it in the procedure linkage table. We
2475 will fill in the contents of the procedure linkage table later,
2476 when we know the address of the .got section. */
2477 if (eh->type == STT_FUNC
2478 || eh->needs_plt)
2479 {
2480 if (eh->plt.refcount <= 0
2481 || SYMBOL_CALLS_LOCAL (info, eh)
2482 || (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT
2483 && eh->root.type == bfd_link_hash_undefweak))
2484 {
2485 /* This case can occur if we saw a PLT reloc in an input
2486 file, but the symbol was never referred to by a dynamic
2487 object. In such a case, we don't actually need to build
2488 a procedure linkage table, and we can just do a PCREL
2489 reloc instead. */
2490 eh->plt.offset = (bfd_vma) -1;
2491 eh->needs_plt = 0;
2492 }
2493
2494 return TRUE;
2495 }
2496 else
2497 eh->plt.offset = (bfd_vma) -1;
2498
2499 /* If this is a weak symbol, and there is a real definition, the
2500 processor independent code will have arranged for us to see the
2501 real definition first, and we can just use the same value. */
2502 if (eh->u.weakdef != NULL)
2503 {
2504 if (eh->u.weakdef->root.type != bfd_link_hash_defined
2505 && eh->u.weakdef->root.type != bfd_link_hash_defweak)
2506 abort ();
2507 eh->root.u.def.section = eh->u.weakdef->root.u.def.section;
2508 eh->root.u.def.value = eh->u.weakdef->root.u.def.value;
2509 eh->non_got_ref = eh->u.weakdef->non_got_ref;
2510 return TRUE;
2511 }
2512
2513 /* This is a reference to a symbol defined by a dynamic object which
2514 is not a function. */
2515
2516 /* If we are creating a shared library, we must presume that the
2517 only references to the symbol are via the global offset table.
2518 For such cases we need not do anything here; the relocations will
2519 be handled correctly by relocate_section. */
2520 if (bfd_link_pic (info))
2521 return TRUE;
2522
2523 /* If there are no references to this symbol that do not use the
2524 GOT, we don't need to generate a copy reloc. */
2525 if (!eh->non_got_ref)
2526 return TRUE;
2527
2528 /* If -z nocopyreloc was given, we won't generate them either. */
2529 if (info->nocopyreloc)
2530 {
2531 eh->non_got_ref = 0;
2532 return TRUE;
2533 }
2534
2535 hh = (struct elf_metag_link_hash_entry *) eh;
2536 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next)
2537 {
2538 s = hdh_p->sec->output_section;
2539 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2540 break;
2541 }
2542
2543 /* If we didn't find any dynamic relocs in read-only sections, then
2544 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2545 if (hdh_p == NULL)
2546 {
2547 eh->non_got_ref = 0;
2548 return TRUE;
2549 }
2550
2551 /* We must allocate the symbol in our .dynbss section, which will
2552 become part of the .bss section of the executable. There will be
2553 an entry for this symbol in the .dynsym section. The dynamic
2554 object will contain position independent code, so all references
2555 from the dynamic object to this symbol will go through the global
2556 offset table. The dynamic linker will use the .dynsym entry to
2557 determine the address it must put in the global offset table, so
2558 both the dynamic object and the regular object will refer to the
2559 same memory location for the variable. */
2560
2561 htab = metag_link_hash_table (info);
2562
2563 /* We must generate a COPY reloc to tell the dynamic linker to
2564 copy the initial value out of the dynamic object and into the
2565 runtime process image. */
2566 if ((eh->root.u.def.section->flags & SEC_READONLY) != 0)
2567 {
2568 s = htab->etab.sdynrelro;
2569 srel = htab->etab.sreldynrelro;
2570 }
2571 else
2572 {
2573 s = htab->etab.sdynbss;
2574 srel = htab->etab.srelbss;
2575 }
2576 if ((eh->root.u.def.section->flags & SEC_ALLOC) != 0 && eh->size != 0)
2577 {
2578 srel->size += sizeof (Elf32_External_Rela);
2579 eh->needs_copy = 1;
2580 }
2581
2582 return _bfd_elf_adjust_dynamic_copy (info, eh, s);
2583 }
2584
2585 /* Allocate space in .plt, .got and associated reloc sections for
2586 global syms. */
2587
2588 static bfd_boolean
2589 allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf)
2590 {
2591 struct bfd_link_info *info;
2592 struct elf_metag_link_hash_table *htab;
2593 struct elf_metag_link_hash_entry *hh;
2594 struct elf_metag_dyn_reloc_entry *hdh_p;
2595
2596 if (eh->root.type == bfd_link_hash_indirect)
2597 return TRUE;
2598
2599 if (eh->root.type == bfd_link_hash_warning)
2600 eh = (struct elf_link_hash_entry *) eh->root.u.i.link;
2601
2602 info = inf;
2603 htab = metag_link_hash_table (info);
2604
2605 if (htab->etab.dynamic_sections_created
2606 && eh->plt.refcount > 0)
2607 {
2608 /* Make sure this symbol is output as a dynamic symbol.
2609 Undefined weak syms won't yet be marked as dynamic. */
2610 if (eh->dynindx == -1
2611 && !eh->forced_local)
2612 {
2613 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2614 return FALSE;
2615 }
2616
2617 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), eh))
2618 {
2619 asection *s = htab->etab.splt;
2620
2621 /* If this is the first .plt entry, make room for the special
2622 first entry. */
2623 if (s->size == 0)
2624 s->size += PLT_ENTRY_SIZE;
2625
2626 eh->plt.offset = s->size;
2627
2628 /* If this symbol is not defined in a regular file, and we are
2629 not generating a shared library, then set the symbol to this
2630 location in the .plt. This is required to make function
2631 pointers compare as equal between the normal executable and
2632 the shared library. */
2633 if (! bfd_link_pic (info)
2634 && !eh->def_regular)
2635 {
2636 eh->root.u.def.section = s;
2637 eh->root.u.def.value = eh->plt.offset;
2638 }
2639
2640 /* Make room for this entry. */
2641 s->size += PLT_ENTRY_SIZE;
2642
2643 /* We also need to make an entry in the .got.plt section, which
2644 will be placed in the .got section by the linker script. */
2645 htab->etab.sgotplt->size += 4;
2646
2647 /* We also need to make an entry in the .rel.plt section. */
2648 htab->etab.srelplt->size += sizeof (Elf32_External_Rela);
2649 }
2650 else
2651 {
2652 eh->plt.offset = (bfd_vma) -1;
2653 eh->needs_plt = 0;
2654 }
2655 }
2656 else
2657 {
2658 eh->plt.offset = (bfd_vma) -1;
2659 eh->needs_plt = 0;
2660 }
2661
2662 if (eh->got.refcount > 0)
2663 {
2664 asection *s;
2665 bfd_boolean dyn;
2666 int tls_type = metag_elf_hash_entry (eh)->tls_type;
2667
2668 /* Make sure this symbol is output as a dynamic symbol.
2669 Undefined weak syms won't yet be marked as dynamic. */
2670 if (eh->dynindx == -1
2671 && !eh->forced_local)
2672 {
2673 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2674 return FALSE;
2675 }
2676
2677 s = htab->etab.sgot;
2678
2679 eh->got.offset = s->size;
2680 s->size += 4;
2681 /* R_METAG_TLS_GD needs 2 consecutive GOT slots. */
2682 if (tls_type == GOT_TLS_GD)
2683 s->size += 4;
2684 dyn = htab->etab.dynamic_sections_created;
2685 /* R_METAG_TLS_IE needs one dynamic relocation if dynamic,
2686 R_METAG_TLS_GD needs one if local symbol and two if global. */
2687 if ((tls_type == GOT_TLS_GD && eh->dynindx == -1)
2688 || (tls_type == GOT_TLS_IE && dyn))
2689 htab->etab.srelgot->size += sizeof (Elf32_External_Rela);
2690 else if (tls_type == GOT_TLS_GD)
2691 htab->etab.srelgot->size += 2 * sizeof (Elf32_External_Rela);
2692 else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2693 bfd_link_pic (info),
2694 eh))
2695 htab->etab.srelgot->size += sizeof (Elf32_External_Rela);
2696 }
2697 else
2698 eh->got.offset = (bfd_vma) -1;
2699
2700 hh = (struct elf_metag_link_hash_entry *) eh;
2701 if (hh->dyn_relocs == NULL)
2702 return TRUE;
2703
2704 /* If this is a -Bsymbolic shared link, then we need to discard all
2705 space allocated for dynamic pc-relative relocs against symbols
2706 defined in a regular object. For the normal shared case, discard
2707 space for relocs that have become local due to symbol visibility
2708 changes. */
2709 if (bfd_link_pic (info))
2710 {
2711 if (SYMBOL_CALLS_LOCAL (info, eh))
2712 {
2713 struct elf_metag_dyn_reloc_entry **hdh_pp;
2714
2715 for (hdh_pp = &hh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; )
2716 {
2717 hdh_p->count -= hdh_p->relative_count;
2718 hdh_p->relative_count = 0;
2719 if (hdh_p->count == 0)
2720 *hdh_pp = hdh_p->hdh_next;
2721 else
2722 hdh_pp = &hdh_p->hdh_next;
2723 }
2724 }
2725
2726 /* Also discard relocs on undefined weak syms with non-default
2727 visibility. */
2728 if (hh->dyn_relocs != NULL
2729 && eh->root.type == bfd_link_hash_undefweak)
2730 {
2731 if (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT)
2732 hh->dyn_relocs = NULL;
2733
2734 /* Make sure undefined weak symbols are output as a dynamic
2735 symbol in PIEs. */
2736 else if (eh->dynindx == -1
2737 && !eh->forced_local)
2738 {
2739 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2740 return FALSE;
2741 }
2742 }
2743 }
2744 else
2745 {
2746 /* For the non-shared case, discard space for relocs against
2747 symbols which turn out to need copy relocs or are not
2748 dynamic. */
2749 if (!eh->non_got_ref
2750 && ((eh->def_dynamic
2751 && !eh->def_regular)
2752 || (htab->etab.dynamic_sections_created
2753 && (eh->root.type == bfd_link_hash_undefweak
2754 || eh->root.type == bfd_link_hash_undefined))))
2755 {
2756 /* Make sure this symbol is output as a dynamic symbol.
2757 Undefined weak syms won't yet be marked as dynamic. */
2758 if (eh->dynindx == -1
2759 && !eh->forced_local)
2760 {
2761 if (! bfd_elf_link_record_dynamic_symbol (info, eh))
2762 return FALSE;
2763 }
2764
2765 /* If that succeeded, we know we'll be keeping all the
2766 relocs. */
2767 if (eh->dynindx != -1)
2768 goto keep;
2769 }
2770
2771 hh->dyn_relocs = NULL;
2772 return TRUE;
2773
2774 keep: ;
2775 }
2776
2777 /* Finally, allocate space. */
2778 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next)
2779 {
2780 asection *sreloc = elf_section_data (hdh_p->sec)->sreloc;
2781 sreloc->size += hdh_p->count * sizeof (Elf32_External_Rela);
2782 }
2783
2784 return TRUE;
2785 }
2786
2787 /* Find any dynamic relocs that apply to read-only sections. */
2788
2789 static bfd_boolean
2790 readonly_dynrelocs (struct elf_link_hash_entry *eh, void *inf)
2791 {
2792 struct elf_metag_link_hash_entry *hh;
2793 struct elf_metag_dyn_reloc_entry *hdh_p;
2794
2795 if (eh->root.type == bfd_link_hash_warning)
2796 eh = (struct elf_link_hash_entry *) eh->root.u.i.link;
2797
2798 hh = (struct elf_metag_link_hash_entry *) eh;
2799 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next)
2800 {
2801 asection *s = hdh_p->sec->output_section;
2802
2803 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2804 {
2805 struct bfd_link_info *info = inf;
2806
2807 info->flags |= DF_TEXTREL;
2808
2809 /* Not an error, just cut short the traversal. */
2810 return FALSE;
2811 }
2812 }
2813 return TRUE;
2814 }
2815
2816 /* Set the sizes of the dynamic sections. */
2817
2818 static bfd_boolean
2819 elf_metag_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2820 struct bfd_link_info *info)
2821 {
2822 struct elf_metag_link_hash_table *htab;
2823 bfd *dynobj;
2824 bfd *ibfd;
2825 asection *s;
2826 bfd_boolean relocs;
2827
2828 htab = metag_link_hash_table (info);
2829 dynobj = htab->etab.dynobj;
2830 if (dynobj == NULL)
2831 abort ();
2832
2833 if (htab->etab.dynamic_sections_created)
2834 {
2835 /* Set the contents of the .interp section to the interpreter. */
2836 if (bfd_link_executable (info) && !info->nointerp)
2837 {
2838 s = bfd_get_linker_section (dynobj, ".interp");
2839 if (s == NULL)
2840 abort ();
2841 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2842 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2843 }
2844 }
2845
2846 /* Set up .got offsets for local syms, and space for local dynamic
2847 relocs. */
2848 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2849 {
2850 bfd_signed_vma *local_got;
2851 bfd_signed_vma *end_local_got;
2852 bfd_size_type locsymcount;
2853 Elf_Internal_Shdr *symtab_hdr;
2854 asection *srel;
2855 char *local_tls_type;
2856
2857 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2858 continue;
2859
2860 for (s = ibfd->sections; s != NULL; s = s->next)
2861 {
2862 struct elf_metag_dyn_reloc_entry *hdh_p;
2863
2864 for (hdh_p = ((struct elf_metag_dyn_reloc_entry *)
2865 elf_section_data (s)->local_dynrel);
2866 hdh_p != NULL;
2867 hdh_p = hdh_p->hdh_next)
2868 {
2869 if (!bfd_is_abs_section (hdh_p->sec)
2870 && bfd_is_abs_section (hdh_p->sec->output_section))
2871 {
2872 /* Input section has been discarded, either because
2873 it is a copy of a linkonce section or due to
2874 linker script /DISCARD/, so we'll be discarding
2875 the relocs too. */
2876 }
2877 else if (hdh_p->count != 0)
2878 {
2879 srel = elf_section_data (hdh_p->sec)->sreloc;
2880 srel->size += hdh_p->count * sizeof (Elf32_External_Rela);
2881 if ((hdh_p->sec->output_section->flags & SEC_READONLY) != 0)
2882 info->flags |= DF_TEXTREL;
2883 }
2884 }
2885 }
2886
2887 local_got = elf_local_got_refcounts (ibfd);
2888 if (!local_got)
2889 continue;
2890
2891 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2892 locsymcount = symtab_hdr->sh_info;
2893 end_local_got = local_got + locsymcount;
2894 local_tls_type = metag_elf_local_got_tls_type (ibfd);
2895 s = htab->etab.sgot;
2896 srel = htab->etab.srelgot;
2897 for (; local_got < end_local_got; ++local_got)
2898 {
2899 if (*local_got > 0)
2900 {
2901 *local_got = s->size;
2902 s->size += GOT_ENTRY_SIZE;
2903 /* R_METAG_TLS_GD relocs need 2 consecutive GOT entries. */
2904 if (*local_tls_type == GOT_TLS_GD)
2905 s->size += 4;
2906 if (bfd_link_pic (info))
2907 srel->size += sizeof (Elf32_External_Rela);
2908 }
2909 else
2910 *local_got = (bfd_vma) -1;
2911 ++local_tls_type;
2912 }
2913 }
2914
2915 if (htab->tls_ldm_got.refcount > 0)
2916 {
2917 /* Allocate 2 got entries and 1 dynamic reloc for R_METAG_TLS_LDM
2918 reloc. */
2919 htab->tls_ldm_got.offset = htab->etab.sgot->size;
2920 htab->etab.sgot->size += 8;
2921 htab->etab.srelgot->size += sizeof (Elf32_External_Rela);
2922 }
2923 else
2924 htab->tls_ldm_got.offset = -1;
2925
2926 /* Allocate global sym .plt and .got entries, and space for global
2927 sym dynamic relocs. */
2928 elf_link_hash_traverse (&htab->etab, allocate_dynrelocs, info);
2929
2930 /* We now have determined the sizes of the various dynamic sections.
2931 Allocate memory for them. */
2932 relocs = FALSE;
2933 for (s = dynobj->sections; s != NULL; s = s->next)
2934 {
2935 bfd_boolean reloc_section = FALSE;
2936
2937 if ((s->flags & SEC_LINKER_CREATED) == 0)
2938 continue;
2939
2940 if (s == htab->etab.splt
2941 || s == htab->etab.sgot
2942 || s == htab->etab.sgotplt
2943 || s == htab->etab.sdynbss
2944 || s == htab->etab.sdynrelro)
2945 {
2946 /* Strip this section if we don't need it; see the
2947 comment below. */
2948 }
2949 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2950 {
2951 if (s->size != 0 && s != htab->etab.srelplt)
2952 relocs = TRUE;
2953
2954 /* We use the reloc_count field as a counter if we need
2955 to copy relocs into the output file. */
2956 s->reloc_count = 0;
2957 reloc_section = TRUE;
2958 }
2959 else
2960 {
2961 /* It's not one of our sections, so don't allocate space. */
2962 continue;
2963 }
2964
2965 if (s->size == 0)
2966 {
2967 /* If we don't need this section, strip it from the
2968 output file. This is mostly to handle .rela.bss and
2969 .rela.plt. We must create both sections in
2970 create_dynamic_sections, because they must be created
2971 before the linker maps input sections to output
2972 sections. The linker does that before
2973 adjust_dynamic_symbol is called, and it is that
2974 function which decides whether anything needs to go
2975 into these sections. */
2976 s->flags |= SEC_EXCLUDE;
2977 continue;
2978 }
2979
2980 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2981 continue;
2982
2983 /* Allocate memory for the section contents. */
2984 s->contents = bfd_zalloc (dynobj, s->size);
2985 if (s->contents == NULL)
2986 return FALSE;
2987 else if (reloc_section)
2988 {
2989 unsigned char *contents = s->contents;
2990 Elf32_External_Rela reloc;
2991
2992 /* Fill the reloc section with a R_METAG_NONE type reloc. */
2993 memset(&reloc, 0, sizeof(Elf32_External_Rela));
2994 reloc.r_info[0] = R_METAG_NONE;
2995 for (; contents < (s->contents + s->size);
2996 contents += sizeof(Elf32_External_Rela))
2997 {
2998 memcpy(contents, &reloc, sizeof(Elf32_External_Rela));
2999 }
3000 }
3001 }
3002
3003 if (htab->etab.dynamic_sections_created)
3004 {
3005 /* Add some entries to the .dynamic section. We fill in the
3006 values later, in elf_metag_finish_dynamic_sections, but we
3007 must add the entries now so that we get the correct size for
3008 the .dynamic section. The DT_DEBUG entry is filled in by the
3009 dynamic linker and used by the debugger. */
3010 #define add_dynamic_entry(TAG, VAL) \
3011 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3012
3013 if (!add_dynamic_entry (DT_PLTGOT, 0))
3014 return FALSE;
3015
3016 if (bfd_link_executable (info))
3017 {
3018 if (!add_dynamic_entry (DT_DEBUG, 0))
3019 return FALSE;
3020 }
3021
3022 if (htab->etab.srelplt->size != 0)
3023 {
3024 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3025 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3026 || !add_dynamic_entry (DT_JMPREL, 0))
3027 return FALSE;
3028 }
3029
3030 if (relocs)
3031 {
3032 if (!add_dynamic_entry (DT_RELA, 0)
3033 || !add_dynamic_entry (DT_RELASZ, 0)
3034 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
3035 return FALSE;
3036
3037 /* If any dynamic relocs apply to a read-only section,
3038 then we need a DT_TEXTREL entry. */
3039 if ((info->flags & DF_TEXTREL) == 0)
3040 elf_link_hash_traverse (&htab->etab, readonly_dynrelocs, info);
3041
3042 if ((info->flags & DF_TEXTREL) != 0)
3043 {
3044 if (!add_dynamic_entry (DT_TEXTREL, 0))
3045 return FALSE;
3046 }
3047 }
3048 }
3049 #undef add_dynamic_entry
3050
3051 return TRUE;
3052 }
3053
3054 /* Finish up dynamic symbol handling. We set the contents of various
3055 dynamic sections here. */
3056
3057 static bfd_boolean
3058 elf_metag_finish_dynamic_symbol (bfd *output_bfd,
3059 struct bfd_link_info *info,
3060 struct elf_link_hash_entry *eh,
3061 Elf_Internal_Sym *sym)
3062 {
3063 struct elf_metag_link_hash_table *htab;
3064 Elf_Internal_Rela rel;
3065 bfd_byte *loc;
3066
3067 htab = metag_link_hash_table (info);
3068
3069 if (eh->plt.offset != (bfd_vma) -1)
3070 {
3071 asection *splt;
3072 asection *sgot;
3073 asection *srela;
3074
3075 bfd_vma plt_index;
3076 bfd_vma got_offset;
3077 bfd_vma got_entry;
3078
3079 if (eh->plt.offset & 1)
3080 abort ();
3081
3082 BFD_ASSERT (eh->dynindx != -1);
3083
3084 splt = htab->etab.splt;
3085 sgot = htab->etab.sgotplt;
3086 srela = htab->etab.srelplt;
3087 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
3088
3089 /* Get the index in the procedure linkage table which
3090 corresponds to this symbol. This is the index of this symbol
3091 in all the symbols for which we are making plt entries. The
3092 first entry in the procedure linkage table is reserved. */
3093 plt_index = eh->plt.offset / PLT_ENTRY_SIZE - 1;
3094
3095 /* Get the offset into the .got.plt table of the entry that
3096 corresponds to this function. */
3097 got_offset = plt_index * GOT_ENTRY_SIZE;
3098
3099 BFD_ASSERT (got_offset < (1 << 16));
3100
3101 got_entry = sgot->output_section->vma
3102 + sgot->output_offset
3103 + got_offset;
3104
3105 BFD_ASSERT (plt_index < (1 << 16));
3106
3107 /* Fill in the entry in the procedure linkage table. */
3108 if (! bfd_link_pic (info))
3109 {
3110 bfd_put_32 (output_bfd,
3111 (plt_entry[0]
3112 | (((got_entry >> 16) & 0xffff) << 3)),
3113 splt->contents + eh->plt.offset);
3114 bfd_put_32 (output_bfd,
3115 (plt_entry[1]
3116 | ((got_entry & 0xffff) << 3)),
3117 splt->contents + eh->plt.offset + 4);
3118 bfd_put_32 (output_bfd, plt_entry[2],
3119 splt->contents + eh->plt.offset + 8);
3120 bfd_put_32 (output_bfd,
3121 (plt_entry[3] | (plt_index << 3)),
3122 splt->contents + eh->plt.offset + 12);
3123 bfd_put_32 (output_bfd,
3124 (plt_entry[4]
3125 | ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)),
3126 splt->contents + eh->plt.offset + 16);
3127 }
3128 else
3129 {
3130 bfd_vma addr = got_entry - (splt->output_section->vma +
3131 splt->output_offset + eh->plt.offset);
3132
3133 bfd_put_32 (output_bfd,
3134 plt_pic_entry[0] | (((addr >> 16) & 0xffff) << 3),
3135 splt->contents + eh->plt.offset);
3136 bfd_put_32 (output_bfd,
3137 plt_pic_entry[1] | ((addr & 0xffff) << 3),
3138 splt->contents + eh->plt.offset + 4);
3139 bfd_put_32 (output_bfd, plt_pic_entry[2],
3140 splt->contents + eh->plt.offset + 8);
3141 bfd_put_32 (output_bfd,
3142 (plt_pic_entry[3] | (plt_index << 3)),
3143 splt->contents + eh->plt.offset + 12);
3144 bfd_put_32 (output_bfd,
3145 (plt_pic_entry[4]
3146 + ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)),
3147 splt->contents + eh->plt.offset + 16);
3148 }
3149
3150 /* Fill in the entry in the global offset table. */
3151 bfd_put_32 (output_bfd,
3152 (splt->output_section->vma
3153 + splt->output_offset
3154 + eh->plt.offset
3155 + 12), /* offset within PLT entry */
3156 sgot->contents + got_offset);
3157
3158 /* Fill in the entry in the .rela.plt section. */
3159 rel.r_offset = (sgot->output_section->vma
3160 + sgot->output_offset
3161 + got_offset);
3162 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_JMP_SLOT);
3163 rel.r_addend = 0;
3164 loc = htab->etab.srelplt->contents;
3165 loc += plt_index * sizeof(Elf32_External_Rela);
3166 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
3167
3168 if (!eh->def_regular)
3169 {
3170 /* Mark the symbol as undefined, rather than as defined in
3171 the .plt section. Leave the value alone. */
3172 sym->st_shndx = SHN_UNDEF;
3173 }
3174 }
3175
3176 if (eh->got.offset != (bfd_vma) -1
3177 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_GD) == 0
3178 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_IE) == 0)
3179 {
3180 /* This symbol has an entry in the global offset table. Set it
3181 up. */
3182
3183 rel.r_offset = ((eh->got.offset &~ (bfd_vma) 1)
3184 + htab->etab.sgot->output_offset
3185 + htab->etab.sgot->output_section->vma);
3186
3187 /* If this is a -Bsymbolic link and the symbol is defined
3188 locally or was forced to be local because of a version file,
3189 we just want to emit a RELATIVE reloc. The entry in the
3190 global offset table will already have been initialized in the
3191 relocate_section function. */
3192 if (bfd_link_pic (info)
3193 && (info->symbolic || eh->dynindx == -1)
3194 && eh->def_regular)
3195 {
3196 rel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE);
3197 rel.r_addend = (eh->root.u.def.value
3198 + eh->root.u.def.section->output_offset
3199 + eh->root.u.def.section->output_section->vma);
3200 }
3201 else
3202 {
3203 if ((eh->got.offset & 1) != 0)
3204 abort ();
3205 bfd_put_32 (output_bfd, 0, htab->etab.sgot->contents + eh->got.offset);
3206 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_GLOB_DAT);
3207 rel.r_addend = 0;
3208 }
3209
3210 loc = htab->etab.srelgot->contents;
3211 loc += htab->etab.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3212 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
3213 }
3214
3215 if (eh->needs_copy)
3216 {
3217 asection *s;
3218
3219 /* This symbol needs a copy reloc. Set it up. */
3220
3221 if (! (eh->dynindx != -1
3222 && (eh->root.type == bfd_link_hash_defined
3223 || eh->root.type == bfd_link_hash_defweak)))
3224 abort ();
3225
3226 rel.r_offset = (eh->root.u.def.value
3227 + eh->root.u.def.section->output_offset
3228 + eh->root.u.def.section->output_section->vma);
3229 rel.r_addend = 0;
3230 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_COPY);
3231 if (eh->root.u.def.section == htab->etab.sdynrelro)
3232 s = htab->etab.sreldynrelro;
3233 else
3234 s = htab->etab.srelbss;
3235 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
3236 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
3237 }
3238
3239 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3240 if (eh->root.root.string[0] == '_'
3241 && (strcmp (eh->root.root.string, "_DYNAMIC") == 0
3242 || eh == htab->etab.hgot))
3243 {
3244 sym->st_shndx = SHN_ABS;
3245 }
3246
3247 return TRUE;
3248 }
3249
3250 /* Set the Meta ELF ABI version. */
3251
3252 static void
3253 elf_metag_post_process_headers (bfd * abfd, struct bfd_link_info * link_info)
3254 {
3255 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
3256
3257 _bfd_elf_post_process_headers (abfd, link_info);
3258 i_ehdrp = elf_elfheader (abfd);
3259 i_ehdrp->e_ident[EI_ABIVERSION] = METAG_ELF_ABI_VERSION;
3260 }
3261
3262 /* Used to decide how to sort relocs in an optimal manner for the
3263 dynamic linker, before writing them out. */
3264
3265 static enum elf_reloc_type_class
3266 elf_metag_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3267 const asection *rel_sec ATTRIBUTE_UNUSED,
3268 const Elf_Internal_Rela *rela)
3269 {
3270 switch ((int) ELF32_R_TYPE (rela->r_info))
3271 {
3272 case R_METAG_RELATIVE:
3273 return reloc_class_relative;
3274 case R_METAG_JMP_SLOT:
3275 return reloc_class_plt;
3276 case R_METAG_COPY:
3277 return reloc_class_copy;
3278 default:
3279 return reloc_class_normal;
3280 }
3281 }
3282
3283 /* Finish up the dynamic sections. */
3284
3285 static bfd_boolean
3286 elf_metag_finish_dynamic_sections (bfd *output_bfd,
3287 struct bfd_link_info *info)
3288 {
3289 bfd *dynobj;
3290 struct elf_metag_link_hash_table *htab;
3291 asection *sdyn;
3292
3293 htab = metag_link_hash_table (info);
3294 dynobj = htab->etab.dynobj;
3295
3296 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3297
3298 if (htab->etab.dynamic_sections_created)
3299 {
3300 asection *splt;
3301 Elf32_External_Dyn *dyncon, *dynconend;
3302
3303 if (sdyn == NULL)
3304 abort ();
3305
3306 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3307 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3308 for (; dyncon < dynconend; dyncon++)
3309 {
3310 Elf_Internal_Dyn dyn;
3311 asection *s;
3312
3313 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3314
3315 switch (dyn.d_tag)
3316 {
3317 default:
3318 continue;
3319
3320 case DT_PLTGOT:
3321 s = htab->etab.sgot;
3322 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3323 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3324 break;
3325
3326 case DT_JMPREL:
3327 s = htab->etab.srelplt;
3328 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3329 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3330 break;
3331
3332 case DT_PLTRELSZ:
3333 s = htab->etab.srelplt;
3334 dyn.d_un.d_val = s->size;
3335 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3336 break;
3337 }
3338
3339 }
3340
3341 /* Fill in the first entry in the procedure linkage table. */
3342 splt = htab->etab.splt;
3343 if (splt && splt->size > 0)
3344 {
3345 unsigned long addr;
3346 /* addr = .got + 4 */
3347 addr = (htab->etab.sgot->output_section->vma
3348 + htab->etab.sgot->output_offset + 4);
3349 if (bfd_link_pic (info))
3350 {
3351 addr -= splt->output_section->vma + splt->output_offset;
3352 bfd_put_32 (output_bfd,
3353 plt0_pic_entry[0] | (((addr >> 16) & 0xffff) << 3),
3354 splt->contents);
3355 bfd_put_32 (output_bfd,
3356 plt0_pic_entry[1] | ((addr & 0xffff) << 3),
3357 splt->contents + 4);
3358 bfd_put_32 (output_bfd, plt0_pic_entry[2], splt->contents + 8);
3359 bfd_put_32 (output_bfd, plt0_pic_entry[3], splt->contents + 12);
3360 bfd_put_32 (output_bfd, plt0_pic_entry[4], splt->contents + 16);
3361 }
3362 else
3363 {
3364 bfd_put_32 (output_bfd,
3365 plt0_entry[0] | (((addr >> 16) & 0xffff) << 3),
3366 splt->contents);
3367 bfd_put_32 (output_bfd,
3368 plt0_entry[1] | ((addr & 0xffff) << 3),
3369 splt->contents + 4);
3370 bfd_put_32 (output_bfd, plt0_entry[2], splt->contents + 8);
3371 bfd_put_32 (output_bfd, plt0_entry[3], splt->contents + 12);
3372 bfd_put_32 (output_bfd, plt0_entry[4], splt->contents + 16);
3373 }
3374
3375 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
3376 PLT_ENTRY_SIZE;
3377 }
3378 }
3379
3380 if (htab->etab.sgot != NULL && htab->etab.sgot->size != 0)
3381 {
3382 /* Fill in the first entry in the global offset table.
3383 We use it to point to our dynamic section, if we have one. */
3384 bfd_put_32 (output_bfd,
3385 sdyn ? sdyn->output_section->vma + sdyn->output_offset : 0,
3386 htab->etab.sgot->contents);
3387
3388 /* The second entry is reserved for use by the dynamic linker. */
3389 memset (htab->etab.sgot->contents + GOT_ENTRY_SIZE, 0, GOT_ENTRY_SIZE);
3390
3391 /* Set .got entry size. */
3392 elf_section_data (htab->etab.sgot->output_section)
3393 ->this_hdr.sh_entsize = GOT_ENTRY_SIZE;
3394 }
3395
3396 return TRUE;
3397 }
3398
3399 /* Return the section that should be marked against GC for a given
3400 relocation. */
3401
3402 static asection *
3403 elf_metag_gc_mark_hook (asection *sec,
3404 struct bfd_link_info *info,
3405 Elf_Internal_Rela *rela,
3406 struct elf_link_hash_entry *hh,
3407 Elf_Internal_Sym *sym)
3408 {
3409 if (hh != NULL)
3410 switch ((unsigned int) ELF32_R_TYPE (rela->r_info))
3411 {
3412 case R_METAG_GNU_VTINHERIT:
3413 case R_METAG_GNU_VTENTRY:
3414 return NULL;
3415 }
3416
3417 return _bfd_elf_gc_mark_hook (sec, info, rela, hh, sym);
3418 }
3419
3420 /* Determine the type of stub needed, if any, for a call. */
3421
3422 static enum elf_metag_stub_type
3423 metag_type_of_stub (asection *input_sec,
3424 const Elf_Internal_Rela *rel,
3425 struct elf_metag_link_hash_entry *hh,
3426 bfd_vma destination,
3427 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3428 {
3429 bfd_vma location;
3430 bfd_vma branch_offset;
3431 bfd_vma max_branch_offset;
3432
3433 if (hh != NULL &&
3434 !(hh->eh.root.type == bfd_link_hash_defined
3435 || hh->eh.root.type == bfd_link_hash_defweak))
3436 return metag_stub_none;
3437
3438 /* Determine where the call point is. */
3439 location = (input_sec->output_offset
3440 + input_sec->output_section->vma
3441 + rel->r_offset);
3442
3443 branch_offset = destination - location;
3444
3445 /* Determine if a long branch stub is needed. Meta branch offsets
3446 are signed 19 bits 4 byte aligned. */
3447 max_branch_offset = (1 << (BRANCH_BITS-1)) << 2;
3448
3449 if (branch_offset + max_branch_offset >= 2*max_branch_offset)
3450 {
3451 if (bfd_link_pic (info))
3452 return metag_stub_long_branch_shared;
3453 else
3454 return metag_stub_long_branch;
3455 }
3456
3457 return metag_stub_none;
3458 }
3459
3460 #define MOVT_A0_3 0x82180005
3461 #define JUMP_A0_3 0xac180003
3462
3463 #define MOVT_A1LBP 0x83080005
3464 #define ADD_A1LBP 0x83080000
3465
3466 #define ADDT_A0_3_CPC 0x82980001
3467 #define ADD_A0_3_A0_3 0x82180000
3468 #define MOV_PC_A0_3 0xa3180ca0
3469
3470 static bfd_boolean
3471 metag_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
3472 {
3473 struct elf_metag_stub_hash_entry *hsh;
3474 asection *stub_sec;
3475 bfd *stub_bfd;
3476 bfd_byte *loc;
3477 bfd_vma sym_value;
3478 int size;
3479
3480 /* Massage our args to the form they really have. */
3481 hsh = (struct elf_metag_stub_hash_entry *) gen_entry;
3482
3483 stub_sec = hsh->stub_sec;
3484
3485 /* Make a note of the offset within the stubs for this entry. */
3486 hsh->stub_offset = stub_sec->size;
3487 loc = stub_sec->contents + hsh->stub_offset;
3488
3489 stub_bfd = stub_sec->owner;
3490
3491 switch (hsh->stub_type)
3492 {
3493 case metag_stub_long_branch_shared:
3494 /* A PIC long branch stub is an ADDT and an ADD instruction used to
3495 calculate the jump target using A0.3 as a temporary. Then a MOV
3496 to PC carries out the jump. */
3497 sym_value = (hsh->target_value
3498 + hsh->target_section->output_offset
3499 + hsh->target_section->output_section->vma
3500 + hsh->addend);
3501
3502 sym_value -= (hsh->stub_offset
3503 + stub_sec->output_offset
3504 + stub_sec->output_section->vma);
3505
3506 bfd_put_32 (stub_bfd, ADDT_A0_3_CPC | (((sym_value >> 16) & 0xffff) << 3),
3507 loc);
3508
3509 bfd_put_32 (stub_bfd, ADD_A0_3_A0_3 | ((sym_value & 0xffff) << 3),
3510 loc + 4);
3511
3512 bfd_put_32 (stub_bfd, MOV_PC_A0_3, loc + 8);
3513
3514 size = 12;
3515 break;
3516 case metag_stub_long_branch:
3517 /* A standard long branch stub is a MOVT instruction followed by a
3518 JUMP instruction using the A0.3 register as a temporary. This is
3519 the same method used by the LDLK linker (patch.c). */
3520 sym_value = (hsh->target_value
3521 + hsh->target_section->output_offset
3522 + hsh->target_section->output_section->vma
3523 + hsh->addend);
3524
3525 bfd_put_32 (stub_bfd, MOVT_A0_3 | (((sym_value >> 16) & 0xffff) << 3),
3526 loc);
3527
3528 bfd_put_32 (stub_bfd, JUMP_A0_3 | ((sym_value & 0xffff) << 3), loc + 4);
3529
3530 size = 8;
3531 break;
3532 default:
3533 BFD_FAIL ();
3534 return FALSE;
3535 }
3536
3537 stub_sec->size += size;
3538 return TRUE;
3539 }
3540
3541 /* As above, but don't actually build the stub. Just bump offset so
3542 we know stub section sizes. */
3543
3544 static bfd_boolean
3545 metag_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
3546 {
3547 struct elf_metag_stub_hash_entry *hsh;
3548 int size = 0;
3549
3550 /* Massage our args to the form they really have. */
3551 hsh = (struct elf_metag_stub_hash_entry *) gen_entry;
3552
3553 if (hsh->stub_type == metag_stub_long_branch)
3554 size = 8;
3555 else if (hsh->stub_type == metag_stub_long_branch_shared)
3556 size = 12;
3557
3558 hsh->stub_sec->size += size;
3559 return TRUE;
3560 }
3561
3562 /* Set up various things so that we can make a list of input sections
3563 for each output section included in the link. Returns -1 on error,
3564 0 when no stubs will be needed, and 1 on success. */
3565
3566 int
3567 elf_metag_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info)
3568 {
3569 bfd *input_bfd;
3570 unsigned int bfd_count;
3571 unsigned int top_id, top_index;
3572 asection *section;
3573 asection **input_list, **list;
3574 bfd_size_type amt;
3575 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3576
3577 /* Count the number of input BFDs and find the top input section id. */
3578 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
3579 input_bfd != NULL;
3580 input_bfd = input_bfd->link.next)
3581 {
3582 bfd_count += 1;
3583 for (section = input_bfd->sections;
3584 section != NULL;
3585 section = section->next)
3586 {
3587 if (top_id < section->id)
3588 top_id = section->id;
3589 }
3590 }
3591
3592 htab->bfd_count = bfd_count;
3593
3594 amt = sizeof (struct map_stub) * (top_id + 1);
3595 htab->stub_group = bfd_zmalloc (amt);
3596 if (htab->stub_group == NULL)
3597 return -1;
3598
3599 /* We can't use output_bfd->section_count here to find the top output
3600 section index as some sections may have been removed, and
3601 strip_excluded_output_sections doesn't renumber the indices. */
3602 for (section = output_bfd->sections, top_index = 0;
3603 section != NULL;
3604 section = section->next)
3605 {
3606 if (top_index < section->index)
3607 top_index = section->index;
3608 }
3609
3610 htab->top_index = top_index;
3611 amt = sizeof (asection *) * (top_index + 1);
3612 input_list = bfd_malloc (amt);
3613 htab->input_list = input_list;
3614 if (input_list == NULL)
3615 return -1;
3616
3617 /* For sections we aren't interested in, mark their entries with a
3618 value we can check later. */
3619 list = input_list + top_index;
3620 do
3621 *list = bfd_abs_section_ptr;
3622 while (list-- != input_list);
3623
3624 for (section = output_bfd->sections;
3625 section != NULL;
3626 section = section->next)
3627 {
3628 /* FIXME: This is a bit of hack. Currently our .ctors and .dtors
3629 * have PC relative relocs in them but no code flag set. */
3630 if (((section->flags & SEC_CODE) != 0) ||
3631 strcmp(".ctors", section->name) ||
3632 strcmp(".dtors", section->name))
3633 input_list[section->index] = NULL;
3634 }
3635
3636 return 1;
3637 }
3638
3639 /* The linker repeatedly calls this function for each input section,
3640 in the order that input sections are linked into output sections.
3641 Build lists of input sections to determine groupings between which
3642 we may insert linker stubs. */
3643
3644 void
3645 elf_metag_next_input_section (struct bfd_link_info *info, asection *isec)
3646 {
3647 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3648
3649 if (isec->output_section->index <= htab->top_index)
3650 {
3651 asection **list = htab->input_list + isec->output_section->index;
3652 if (*list != bfd_abs_section_ptr)
3653 {
3654 /* Steal the link_sec pointer for our list. */
3655 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec)
3656 /* This happens to make the list in reverse order,
3657 which is what we want. */
3658 PREV_SEC (isec) = *list;
3659 *list = isec;
3660 }
3661 }
3662 }
3663
3664 /* See whether we can group stub sections together. Grouping stub
3665 sections may result in fewer stubs. More importantly, we need to
3666 put all .init* and .fini* stubs at the beginning of the .init or
3667 .fini output sections respectively, because glibc splits the
3668 _init and _fini functions into multiple parts. Putting a stub in
3669 the middle of a function is not a good idea. */
3670
3671 static void
3672 group_sections (struct elf_metag_link_hash_table *htab,
3673 bfd_size_type stub_group_size,
3674 bfd_boolean stubs_always_before_branch)
3675 {
3676 asection **list = htab->input_list + htab->top_index;
3677 do
3678 {
3679 asection *tail = *list;
3680 if (tail == bfd_abs_section_ptr)
3681 continue;
3682 while (tail != NULL)
3683 {
3684 asection *curr;
3685 asection *prev;
3686 bfd_size_type total;
3687 bfd_boolean big_sec;
3688
3689 curr = tail;
3690 total = tail->size;
3691 big_sec = total >= stub_group_size;
3692
3693 while ((prev = PREV_SEC (curr)) != NULL
3694 && ((total += curr->output_offset - prev->output_offset)
3695 < stub_group_size))
3696 curr = prev;
3697
3698 /* OK, the size from the start of CURR to the end is less
3699 than stub_group_size bytes and thus can be handled by one stub
3700 section. (or the tail section is itself larger than
3701 stub_group_size bytes, in which case we may be toast.)
3702 We should really be keeping track of the total size of
3703 stubs added here, as stubs contribute to the final output
3704 section size. */
3705 do
3706 {
3707 prev = PREV_SEC (tail);
3708 /* Set up this stub group. */
3709 htab->stub_group[tail->id].link_sec = curr;
3710 }
3711 while (tail != curr && (tail = prev) != NULL);
3712
3713 /* But wait, there's more! Input sections up to stub_group_size
3714 bytes before the stub section can be handled by it too.
3715 Don't do this if we have a really large section after the
3716 stubs, as adding more stubs increases the chance that
3717 branches may not reach into the stub section. */
3718 if (!stubs_always_before_branch && !big_sec)
3719 {
3720 total = 0;
3721 while (prev != NULL
3722 && ((total += tail->output_offset - prev->output_offset)
3723 < stub_group_size))
3724 {
3725 tail = prev;
3726 prev = PREV_SEC (tail);
3727 htab->stub_group[tail->id].link_sec = curr;
3728 }
3729 }
3730 tail = prev;
3731 }
3732 }
3733 while (list-- != htab->input_list);
3734 free (htab->input_list);
3735 #undef PREV_SEC
3736 }
3737
3738 /* Read in all local syms for all input bfds.
3739 Returns -1 on error, 0 otherwise. */
3740
3741 static int
3742 get_local_syms (bfd *output_bfd ATTRIBUTE_UNUSED, bfd *input_bfd,
3743 struct bfd_link_info *info)
3744 {
3745 unsigned int bfd_indx;
3746 Elf_Internal_Sym *local_syms, **all_local_syms;
3747 int stub_changed = 0;
3748 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3749
3750 /* We want to read in symbol extension records only once. To do this
3751 we need to read in the local symbols in parallel and save them for
3752 later use; so hold pointers to the local symbols in an array. */
3753 bfd_size_type amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
3754 all_local_syms = bfd_zmalloc (amt);
3755 htab->all_local_syms = all_local_syms;
3756 if (all_local_syms == NULL)
3757 return -1;
3758
3759 /* Walk over all the input BFDs, swapping in local symbols. */
3760 for (bfd_indx = 0;
3761 input_bfd != NULL;
3762 input_bfd = input_bfd->link.next, bfd_indx++)
3763 {
3764 Elf_Internal_Shdr *symtab_hdr;
3765
3766 /* We'll need the symbol table in a second. */
3767 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3768 if (symtab_hdr->sh_info == 0)
3769 continue;
3770
3771 /* We need an array of the local symbols attached to the input bfd. */
3772 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
3773 if (local_syms == NULL)
3774 {
3775 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3776 symtab_hdr->sh_info, 0,
3777 NULL, NULL, NULL);
3778 /* Cache them for elf_link_input_bfd. */
3779 symtab_hdr->contents = (unsigned char *) local_syms;
3780 }
3781 if (local_syms == NULL)
3782 return -1;
3783
3784 all_local_syms[bfd_indx] = local_syms;
3785 }
3786
3787 return stub_changed;
3788 }
3789
3790 /* Determine and set the size of the stub section for a final link.
3791
3792 The basic idea here is to examine all the relocations looking for
3793 PC-relative calls to a target that is unreachable with a "CALLR"
3794 instruction. */
3795
3796 /* See elf32-hppa.c and elf64-ppc.c. */
3797
3798 bfd_boolean
3799 elf_metag_size_stubs(bfd *output_bfd, bfd *stub_bfd,
3800 struct bfd_link_info *info,
3801 bfd_signed_vma group_size,
3802 asection * (*add_stub_section) (const char *, asection *),
3803 void (*layout_sections_again) (void))
3804 {
3805 bfd_size_type stub_group_size;
3806 bfd_boolean stubs_always_before_branch;
3807 bfd_boolean stub_changed;
3808 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info);
3809
3810 /* Stash our params away. */
3811 htab->stub_bfd = stub_bfd;
3812 htab->add_stub_section = add_stub_section;
3813 htab->layout_sections_again = layout_sections_again;
3814 stubs_always_before_branch = group_size < 0;
3815 if (group_size < 0)
3816 stub_group_size = -group_size;
3817 else
3818 stub_group_size = group_size;
3819 if (stub_group_size == 1)
3820 {
3821 /* Default values. */
3822 /* FIXME: not sure what these values should be */
3823 if (stubs_always_before_branch)
3824 {
3825 stub_group_size = (1 << BRANCH_BITS);
3826 }
3827 else
3828 {
3829 stub_group_size = (1 << BRANCH_BITS);
3830 }
3831 }
3832
3833 group_sections (htab, stub_group_size, stubs_always_before_branch);
3834
3835 switch (get_local_syms (output_bfd, info->input_bfds, info))
3836 {
3837 default:
3838 if (htab->all_local_syms)
3839 goto error_ret_free_local;
3840 return FALSE;
3841
3842 case 0:
3843 stub_changed = FALSE;
3844 break;
3845
3846 case 1:
3847 stub_changed = TRUE;
3848 break;
3849 }
3850
3851 while (1)
3852 {
3853 bfd *input_bfd;
3854 unsigned int bfd_indx;
3855 asection *stub_sec;
3856
3857 for (input_bfd = info->input_bfds, bfd_indx = 0;
3858 input_bfd != NULL;
3859 input_bfd = input_bfd->link.next, bfd_indx++)
3860 {
3861 Elf_Internal_Shdr *symtab_hdr;
3862 asection *section;
3863 Elf_Internal_Sym *local_syms;
3864
3865 /* We'll need the symbol table in a second. */
3866 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3867 if (symtab_hdr->sh_info == 0)
3868 continue;
3869
3870 local_syms = htab->all_local_syms[bfd_indx];
3871
3872 /* Walk over each section attached to the input bfd. */
3873 for (section = input_bfd->sections;
3874 section != NULL;
3875 section = section->next)
3876 {
3877 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
3878
3879 /* If there aren't any relocs, then there's nothing more
3880 to do. */
3881 if ((section->flags & SEC_RELOC) == 0
3882 || section->reloc_count == 0)
3883 continue;
3884
3885 /* If this section is a link-once section that will be
3886 discarded, then don't create any stubs. */
3887 if (section->output_section == NULL
3888 || section->output_section->owner != output_bfd)
3889 continue;
3890
3891 /* Get the relocs. */
3892 internal_relocs
3893 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
3894 info->keep_memory);
3895 if (internal_relocs == NULL)
3896 goto error_ret_free_local;
3897
3898 /* Now examine each relocation. */
3899 irela = internal_relocs;
3900 irelaend = irela + section->reloc_count;
3901 for (; irela < irelaend; irela++)
3902 {
3903 unsigned int r_type, r_indx;
3904 enum elf_metag_stub_type stub_type;
3905 struct elf_metag_stub_hash_entry *hsh;
3906 asection *sym_sec;
3907 bfd_vma sym_value;
3908 bfd_vma destination;
3909 struct elf_metag_link_hash_entry *hh;
3910 char *stub_name;
3911 const asection *id_sec;
3912
3913 r_type = ELF32_R_TYPE (irela->r_info);
3914 r_indx = ELF32_R_SYM (irela->r_info);
3915
3916 if (r_type >= (unsigned int) R_METAG_MAX)
3917 {
3918 bfd_set_error (bfd_error_bad_value);
3919 error_ret_free_internal:
3920 if (elf_section_data (section)->relocs == NULL)
3921 free (internal_relocs);
3922 goto error_ret_free_local;
3923 }
3924
3925 /* Only look for stubs on CALLR and B instructions. */
3926 if (!(r_type == (unsigned int) R_METAG_RELBRANCH ||
3927 r_type == (unsigned int) R_METAG_RELBRANCH_PLT))
3928 continue;
3929
3930 /* Now determine the call target, its name, value,
3931 section. */
3932 sym_sec = NULL;
3933 sym_value = 0;
3934 destination = 0;
3935 hh = NULL;
3936 if (r_indx < symtab_hdr->sh_info)
3937 {
3938 /* It's a local symbol. */
3939 Elf_Internal_Sym *sym;
3940 Elf_Internal_Shdr *hdr;
3941 unsigned int shndx;
3942
3943 sym = local_syms + r_indx;
3944 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
3945 sym_value = sym->st_value;
3946 shndx = sym->st_shndx;
3947 if (shndx < elf_numsections (input_bfd))
3948 {
3949 hdr = elf_elfsections (input_bfd)[shndx];
3950 sym_sec = hdr->bfd_section;
3951 destination = (sym_value + irela->r_addend
3952 + sym_sec->output_offset
3953 + sym_sec->output_section->vma);
3954 }
3955 }
3956 else
3957 {
3958 /* It's an external symbol. */
3959 int e_indx;
3960
3961 e_indx = r_indx - symtab_hdr->sh_info;
3962 hh = ((struct elf_metag_link_hash_entry *)
3963 elf_sym_hashes (input_bfd)[e_indx]);
3964
3965 while (hh->eh.root.type == bfd_link_hash_indirect
3966 || hh->eh.root.type == bfd_link_hash_warning)
3967 hh = ((struct elf_metag_link_hash_entry *)
3968 hh->eh.root.u.i.link);
3969
3970 if (hh->eh.root.type == bfd_link_hash_defined
3971 || hh->eh.root.type == bfd_link_hash_defweak)
3972 {
3973 sym_sec = hh->eh.root.u.def.section;
3974 sym_value = hh->eh.root.u.def.value;
3975 if (hh->eh.plt.offset != (bfd_vma) -1
3976 && hh->eh.dynindx != -1
3977 && r_type == (unsigned int) R_METAG_RELBRANCH_PLT)
3978 {
3979 sym_sec = htab->etab.splt;
3980 sym_value = hh->eh.plt.offset;
3981 }
3982
3983 if (sym_sec->output_section != NULL)
3984 destination = (sym_value + irela->r_addend
3985 + sym_sec->output_offset
3986 + sym_sec->output_section->vma);
3987 else
3988 continue;
3989 }
3990 else if (hh->eh.root.type == bfd_link_hash_undefweak)
3991 {
3992 if (! bfd_link_pic (info))
3993 continue;
3994 }
3995 else if (hh->eh.root.type == bfd_link_hash_undefined)
3996 {
3997 if (! (info->unresolved_syms_in_objects == RM_IGNORE
3998 && (ELF_ST_VISIBILITY (hh->eh.other)
3999 == STV_DEFAULT)))
4000 continue;
4001 }
4002 else
4003 {
4004 bfd_set_error (bfd_error_bad_value);
4005 goto error_ret_free_internal;
4006 }
4007 }
4008
4009 /* Determine what (if any) linker stub is needed. */
4010 stub_type = metag_type_of_stub (section, irela, hh,
4011 destination, info);
4012 if (stub_type == metag_stub_none)
4013 continue;
4014
4015 /* Support for grouping stub sections. */
4016 id_sec = htab->stub_group[section->id].link_sec;
4017
4018 /* Get the name of this stub. */
4019 stub_name = metag_stub_name (id_sec, sym_sec, hh, irela);
4020 if (!stub_name)
4021 goto error_ret_free_internal;
4022
4023 hsh = metag_stub_hash_lookup (&htab->bstab,
4024 stub_name,
4025 FALSE, FALSE);
4026 if (hsh != NULL)
4027 {
4028 /* The proper stub has already been created. */
4029 free (stub_name);
4030 continue;
4031 }
4032
4033 hsh = metag_add_stub (stub_name, section, htab);
4034 if (hsh == NULL)
4035 {
4036 free (stub_name);
4037 goto error_ret_free_internal;
4038 }
4039 hsh->target_value = sym_value;
4040 hsh->target_section = sym_sec;
4041 hsh->stub_type = stub_type;
4042 hsh->hh = hh;
4043 hsh->addend = irela->r_addend;
4044 stub_changed = TRUE;
4045 }
4046
4047 /* We're done with the internal relocs, free them. */
4048 if (elf_section_data (section)->relocs == NULL)
4049 free (internal_relocs);
4050 }
4051 }
4052
4053 if (!stub_changed)
4054 break;
4055
4056 /* OK, we've added some stubs. Find out the new size of the
4057 stub sections. */
4058 for (stub_sec = htab->stub_bfd->sections;
4059 stub_sec != NULL;
4060 stub_sec = stub_sec->next)
4061 stub_sec->size = 0;
4062
4063 bfd_hash_traverse (&htab->bstab, metag_size_one_stub, htab);
4064
4065 /* Ask the linker to do its stuff. */
4066 (*htab->layout_sections_again) ();
4067 stub_changed = FALSE;
4068 }
4069
4070 free (htab->all_local_syms);
4071 return TRUE;
4072
4073 error_ret_free_local:
4074 free (htab->all_local_syms);
4075 return FALSE;
4076 }
4077
4078 /* Build all the stubs associated with the current output file. The
4079 stubs are kept in a hash table attached to the main linker hash
4080 table. This function is called via metagelf_finish in the linker. */
4081
4082 bfd_boolean
4083 elf_metag_build_stubs (struct bfd_link_info *info)
4084 {
4085 asection *stub_sec;
4086 struct bfd_hash_table *table;
4087 struct elf_metag_link_hash_table *htab;
4088
4089 htab = metag_link_hash_table (info);
4090
4091 for (stub_sec = htab->stub_bfd->sections;
4092 stub_sec != NULL;
4093 stub_sec = stub_sec->next)
4094 {
4095 bfd_size_type size;
4096
4097 /* Allocate memory to hold the linker stubs. */
4098 size = stub_sec->size;
4099 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
4100 if (stub_sec->contents == NULL && size != 0)
4101 return FALSE;
4102 stub_sec->size = 0;
4103 }
4104
4105 /* Build the stubs as directed by the stub hash table. */
4106 table = &htab->bstab;
4107 bfd_hash_traverse (table, metag_build_one_stub, info);
4108
4109 return TRUE;
4110 }
4111
4112 /* Return TRUE if SYM represents a local label symbol. */
4113
4114 static bfd_boolean
4115 elf_metag_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name)
4116 {
4117 if (name[0] == '$' && name[1] == 'L')
4118 return 1;
4119 return _bfd_elf_is_local_label_name (abfd, name);
4120 }
4121
4122 /* Return address for Ith PLT stub in section PLT, for relocation REL
4123 or (bfd_vma) -1 if it should not be included. */
4124
4125 static bfd_vma
4126 elf_metag_plt_sym_val (bfd_vma i, const asection *plt,
4127 const arelent *rel ATTRIBUTE_UNUSED)
4128 {
4129 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4130 }
4131
4132 #define ELF_ARCH bfd_arch_metag
4133 #define ELF_TARGET_ID METAG_ELF_DATA
4134 #define ELF_MACHINE_CODE EM_METAG
4135 #define ELF_MINPAGESIZE 0x1000
4136 #define ELF_MAXPAGESIZE 0x4000
4137 #define ELF_COMMONPAGESIZE 0x1000
4138
4139 #define TARGET_LITTLE_SYM metag_elf32_vec
4140 #define TARGET_LITTLE_NAME "elf32-metag"
4141
4142 #define elf_symbol_leading_char '_'
4143
4144 #define elf_info_to_howto_rel NULL
4145 #define elf_info_to_howto metag_info_to_howto_rela
4146
4147 #define bfd_elf32_bfd_is_local_label_name elf_metag_is_local_label_name
4148 #define bfd_elf32_bfd_link_hash_table_create \
4149 elf_metag_link_hash_table_create
4150 #define elf_backend_relocate_section elf_metag_relocate_section
4151 #define elf_backend_gc_mark_hook elf_metag_gc_mark_hook
4152 #define elf_backend_check_relocs elf_metag_check_relocs
4153 #define elf_backend_create_dynamic_sections elf_metag_create_dynamic_sections
4154 #define elf_backend_adjust_dynamic_symbol elf_metag_adjust_dynamic_symbol
4155 #define elf_backend_finish_dynamic_symbol elf_metag_finish_dynamic_symbol
4156 #define elf_backend_finish_dynamic_sections elf_metag_finish_dynamic_sections
4157 #define elf_backend_size_dynamic_sections elf_metag_size_dynamic_sections
4158 #define elf_backend_omit_section_dynsym \
4159 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4160 #define elf_backend_post_process_headers elf_metag_post_process_headers
4161 #define elf_backend_reloc_type_class elf_metag_reloc_type_class
4162 #define elf_backend_copy_indirect_symbol elf_metag_copy_indirect_symbol
4163 #define elf_backend_plt_sym_val elf_metag_plt_sym_val
4164
4165 #define elf_backend_can_gc_sections 1
4166 #define elf_backend_can_refcount 1
4167 #define elf_backend_rela_normal 1
4168 #define elf_backend_want_got_plt 1
4169 #define elf_backend_want_got_sym 0
4170 #define elf_backend_want_plt_sym 0
4171 #define elf_backend_plt_readonly 1
4172 #define elf_backend_dtrel_excludes_plt 1
4173 #define elf_backend_want_dynrelro 1
4174
4175 #define bfd_elf32_bfd_reloc_type_lookup metag_reloc_type_lookup
4176 #define bfd_elf32_bfd_reloc_name_lookup metag_reloc_name_lookup
4177
4178 #include "elf32-target.h"
The GNU Binutils are a collection of binary tools.