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1/* 32-bit ELF support for ARM
2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21#include "elf/arm.h"
22#include "bfd.h"
23#include "sysdep.h"
24#include "libbfd.h"
25#include "elf-bfd.h"
26
27#ifndef NUM_ELEM
28#define NUM_ELEM(a) (sizeof (a) / (sizeof (a)[0]))
29#endif
30
31#define USE_REL 1
32
33#define elf_info_to_howto 0
34#define elf_info_to_howto_rel elf32_arm_info_to_howto
35
36#define ARM_ELF_ABI_VERSION 0
37#define ARM_ELF_OS_ABI_VERSION ELFOSABI_ARM
38
39static reloc_howto_type * elf32_arm_reloc_type_lookup
40 PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
41static bfd_boolean elf32_arm_nabi_grok_prstatus
42 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
43static bfd_boolean elf32_arm_nabi_grok_psinfo
44 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
45
46/* Note: code such as elf32_arm_reloc_type_lookup expect to use e.g.
47 R_ARM_PC24 as an index into this, and find the R_ARM_PC24 HOWTO
48 in that slot. */
49
50static reloc_howto_type elf32_arm_howto_table[] =
51{
52 /* No relocation */
53 HOWTO (R_ARM_NONE, /* type */
54 0, /* rightshift */
55 0, /* size (0 = byte, 1 = short, 2 = long) */
56 0, /* bitsize */
57 FALSE, /* pc_relative */
58 0, /* bitpos */
59 complain_overflow_dont,/* complain_on_overflow */
60 bfd_elf_generic_reloc, /* special_function */
61 "R_ARM_NONE", /* name */
62 FALSE, /* partial_inplace */
63 0, /* src_mask */
64 0, /* dst_mask */
65 FALSE), /* pcrel_offset */
66
67 HOWTO (R_ARM_PC24, /* type */
68 2, /* rightshift */
69 2, /* size (0 = byte, 1 = short, 2 = long) */
70 24, /* bitsize */
71 TRUE, /* pc_relative */
72 0, /* bitpos */
73 complain_overflow_signed,/* complain_on_overflow */
74 bfd_elf_generic_reloc, /* special_function */
75 "R_ARM_PC24", /* name */
76 FALSE, /* partial_inplace */
77 0x00ffffff, /* src_mask */
78 0x00ffffff, /* dst_mask */
79 TRUE), /* pcrel_offset */
80
81 /* 32 bit absolute */
82 HOWTO (R_ARM_ABS32, /* type */
83 0, /* rightshift */
84 2, /* size (0 = byte, 1 = short, 2 = long) */
85 32, /* bitsize */
86 FALSE, /* pc_relative */
87 0, /* bitpos */
88 complain_overflow_bitfield,/* complain_on_overflow */
89 bfd_elf_generic_reloc, /* special_function */
90 "R_ARM_ABS32", /* name */
91 FALSE, /* partial_inplace */
92 0xffffffff, /* src_mask */
93 0xffffffff, /* dst_mask */
94 FALSE), /* pcrel_offset */
95
96 /* standard 32bit pc-relative reloc */
97 HOWTO (R_ARM_REL32, /* type */
98 0, /* rightshift */
99 2, /* size (0 = byte, 1 = short, 2 = long) */
100 32, /* bitsize */
101 TRUE, /* pc_relative */
102 0, /* bitpos */
103 complain_overflow_bitfield,/* complain_on_overflow */
104 bfd_elf_generic_reloc, /* special_function */
105 "R_ARM_REL32", /* name */
106 FALSE, /* partial_inplace */
107 0xffffffff, /* src_mask */
108 0xffffffff, /* dst_mask */
109 TRUE), /* pcrel_offset */
110
111 /* 8 bit absolute */
112 HOWTO (R_ARM_PC13, /* type */
113 0, /* rightshift */
114 0, /* size (0 = byte, 1 = short, 2 = long) */
115 8, /* bitsize */
116 FALSE, /* pc_relative */
117 0, /* bitpos */
118 complain_overflow_bitfield,/* complain_on_overflow */
119 bfd_elf_generic_reloc, /* special_function */
120 "R_ARM_PC13", /* name */
121 FALSE, /* partial_inplace */
122 0x000000ff, /* src_mask */
123 0x000000ff, /* dst_mask */
124 FALSE), /* pcrel_offset */
125
126 /* 16 bit absolute */
127 HOWTO (R_ARM_ABS16, /* type */
128 0, /* rightshift */
129 1, /* size (0 = byte, 1 = short, 2 = long) */
130 16, /* bitsize */
131 FALSE, /* pc_relative */
132 0, /* bitpos */
133 complain_overflow_bitfield,/* complain_on_overflow */
134 bfd_elf_generic_reloc, /* special_function */
135 "R_ARM_ABS16", /* name */
136 FALSE, /* partial_inplace */
137 0x0000ffff, /* src_mask */
138 0x0000ffff, /* dst_mask */
139 FALSE), /* pcrel_offset */
140
141 /* 12 bit absolute */
142 HOWTO (R_ARM_ABS12, /* type */
143 0, /* rightshift */
144 2, /* size (0 = byte, 1 = short, 2 = long) */
145 12, /* bitsize */
146 FALSE, /* pc_relative */
147 0, /* bitpos */
148 complain_overflow_bitfield,/* complain_on_overflow */
149 bfd_elf_generic_reloc, /* special_function */
150 "R_ARM_ABS12", /* name */
151 FALSE, /* partial_inplace */
152 0x000008ff, /* src_mask */
153 0x000008ff, /* dst_mask */
154 FALSE), /* pcrel_offset */
155
156 HOWTO (R_ARM_THM_ABS5, /* type */
157 6, /* rightshift */
158 1, /* size (0 = byte, 1 = short, 2 = long) */
159 5, /* bitsize */
160 FALSE, /* pc_relative */
161 0, /* bitpos */
162 complain_overflow_bitfield,/* complain_on_overflow */
163 bfd_elf_generic_reloc, /* special_function */
164 "R_ARM_THM_ABS5", /* name */
165 FALSE, /* partial_inplace */
166 0x000007e0, /* src_mask */
167 0x000007e0, /* dst_mask */
168 FALSE), /* pcrel_offset */
169
170 /* 8 bit absolute */
171 HOWTO (R_ARM_ABS8, /* type */
172 0, /* rightshift */
173 0, /* size (0 = byte, 1 = short, 2 = long) */
174 8, /* bitsize */
175 FALSE, /* pc_relative */
176 0, /* bitpos */
177 complain_overflow_bitfield,/* complain_on_overflow */
178 bfd_elf_generic_reloc, /* special_function */
179 "R_ARM_ABS8", /* name */
180 FALSE, /* partial_inplace */
181 0x000000ff, /* src_mask */
182 0x000000ff, /* dst_mask */
183 FALSE), /* pcrel_offset */
184
185 HOWTO (R_ARM_SBREL32, /* type */
186 0, /* rightshift */
187 2, /* size (0 = byte, 1 = short, 2 = long) */
188 32, /* bitsize */
189 FALSE, /* pc_relative */
190 0, /* bitpos */
191 complain_overflow_dont,/* complain_on_overflow */
192 bfd_elf_generic_reloc, /* special_function */
193 "R_ARM_SBREL32", /* name */
194 FALSE, /* partial_inplace */
195 0xffffffff, /* src_mask */
196 0xffffffff, /* dst_mask */
197 FALSE), /* pcrel_offset */
198
199 HOWTO (R_ARM_THM_PC22, /* type */
200 1, /* rightshift */
201 2, /* size (0 = byte, 1 = short, 2 = long) */
202 23, /* bitsize */
203 TRUE, /* pc_relative */
204 0, /* bitpos */
205 complain_overflow_signed,/* complain_on_overflow */
206 bfd_elf_generic_reloc, /* special_function */
207 "R_ARM_THM_PC22", /* name */
208 FALSE, /* partial_inplace */
209 0x07ff07ff, /* src_mask */
210 0x07ff07ff, /* dst_mask */
211 TRUE), /* pcrel_offset */
212
213 HOWTO (R_ARM_THM_PC8, /* type */
214 1, /* rightshift */
215 1, /* size (0 = byte, 1 = short, 2 = long) */
216 8, /* bitsize */
217 TRUE, /* pc_relative */
218 0, /* bitpos */
219 complain_overflow_signed,/* complain_on_overflow */
220 bfd_elf_generic_reloc, /* special_function */
221 "R_ARM_THM_PC8", /* name */
222 FALSE, /* partial_inplace */
223 0x000000ff, /* src_mask */
224 0x000000ff, /* dst_mask */
225 TRUE), /* pcrel_offset */
226
227 HOWTO (R_ARM_AMP_VCALL9, /* type */
228 1, /* rightshift */
229 1, /* size (0 = byte, 1 = short, 2 = long) */
230 8, /* bitsize */
231 TRUE, /* pc_relative */
232 0, /* bitpos */
233 complain_overflow_signed,/* complain_on_overflow */
234 bfd_elf_generic_reloc, /* special_function */
235 "R_ARM_AMP_VCALL9", /* name */
236 FALSE, /* partial_inplace */
237 0x000000ff, /* src_mask */
238 0x000000ff, /* dst_mask */
239 TRUE), /* pcrel_offset */
240
241 HOWTO (R_ARM_SWI24, /* type */
242 0, /* rightshift */
243 0, /* size (0 = byte, 1 = short, 2 = long) */
244 0, /* bitsize */
245 FALSE, /* pc_relative */
246 0, /* bitpos */
247 complain_overflow_signed,/* complain_on_overflow */
248 bfd_elf_generic_reloc, /* special_function */
249 "R_ARM_SWI24", /* name */
250 FALSE, /* partial_inplace */
251 0x00000000, /* src_mask */
252 0x00000000, /* dst_mask */
253 FALSE), /* pcrel_offset */
254
255 HOWTO (R_ARM_THM_SWI8, /* type */
256 0, /* rightshift */
257 0, /* size (0 = byte, 1 = short, 2 = long) */
258 0, /* bitsize */
259 FALSE, /* pc_relative */
260 0, /* bitpos */
261 complain_overflow_signed,/* complain_on_overflow */
262 bfd_elf_generic_reloc, /* special_function */
263 "R_ARM_SWI8", /* name */
264 FALSE, /* partial_inplace */
265 0x00000000, /* src_mask */
266 0x00000000, /* dst_mask */
267 FALSE), /* pcrel_offset */
268
269 /* BLX instruction for the ARM. */
270 HOWTO (R_ARM_XPC25, /* type */
271 2, /* rightshift */
272 2, /* size (0 = byte, 1 = short, 2 = long) */
273 25, /* bitsize */
274 TRUE, /* pc_relative */
275 0, /* bitpos */
276 complain_overflow_signed,/* complain_on_overflow */
277 bfd_elf_generic_reloc, /* special_function */
278 "R_ARM_XPC25", /* name */
279 FALSE, /* partial_inplace */
280 0x00ffffff, /* src_mask */
281 0x00ffffff, /* dst_mask */
282 TRUE), /* pcrel_offset */
283
284 /* BLX instruction for the Thumb. */
285 HOWTO (R_ARM_THM_XPC22, /* type */
286 2, /* rightshift */
287 2, /* size (0 = byte, 1 = short, 2 = long) */
288 22, /* bitsize */
289 TRUE, /* pc_relative */
290 0, /* bitpos */
291 complain_overflow_signed,/* complain_on_overflow */
292 bfd_elf_generic_reloc, /* special_function */
293 "R_ARM_THM_XPC22", /* name */
294 FALSE, /* partial_inplace */
295 0x07ff07ff, /* src_mask */
296 0x07ff07ff, /* dst_mask */
297 TRUE), /* pcrel_offset */
298
299 /* These next three relocs are not defined, but we need to fill the space. */
300
301 HOWTO (R_ARM_NONE, /* type */
302 0, /* rightshift */
303 0, /* size (0 = byte, 1 = short, 2 = long) */
304 0, /* bitsize */
305 FALSE, /* pc_relative */
306 0, /* bitpos */
307 complain_overflow_dont,/* complain_on_overflow */
308 bfd_elf_generic_reloc, /* special_function */
309 "R_ARM_unknown_17", /* name */
310 FALSE, /* partial_inplace */
311 0, /* src_mask */
312 0, /* dst_mask */
313 FALSE), /* pcrel_offset */
314
315 HOWTO (R_ARM_NONE, /* type */
316 0, /* rightshift */
317 0, /* size (0 = byte, 1 = short, 2 = long) */
318 0, /* bitsize */
319 FALSE, /* pc_relative */
320 0, /* bitpos */
321 complain_overflow_dont,/* complain_on_overflow */
322 bfd_elf_generic_reloc, /* special_function */
323 "R_ARM_unknown_18", /* name */
324 FALSE, /* partial_inplace */
325 0, /* src_mask */
326 0, /* dst_mask */
327 FALSE), /* pcrel_offset */
328
329 HOWTO (R_ARM_NONE, /* type */
330 0, /* rightshift */
331 0, /* size (0 = byte, 1 = short, 2 = long) */
332 0, /* bitsize */
333 FALSE, /* pc_relative */
334 0, /* bitpos */
335 complain_overflow_dont,/* complain_on_overflow */
336 bfd_elf_generic_reloc, /* special_function */
337 "R_ARM_unknown_19", /* name */
338 FALSE, /* partial_inplace */
339 0, /* src_mask */
340 0, /* dst_mask */
341 FALSE), /* pcrel_offset */
342
343 /* Relocs used in ARM Linux */
344
345 HOWTO (R_ARM_COPY, /* type */
346 0, /* rightshift */
347 2, /* size (0 = byte, 1 = short, 2 = long) */
348 32, /* bitsize */
349 FALSE, /* pc_relative */
350 0, /* bitpos */
351 complain_overflow_bitfield,/* complain_on_overflow */
352 bfd_elf_generic_reloc, /* special_function */
353 "R_ARM_COPY", /* name */
354 TRUE, /* partial_inplace */
355 0xffffffff, /* src_mask */
356 0xffffffff, /* dst_mask */
357 FALSE), /* pcrel_offset */
358
359 HOWTO (R_ARM_GLOB_DAT, /* type */
360 0, /* rightshift */
361 2, /* size (0 = byte, 1 = short, 2 = long) */
362 32, /* bitsize */
363 FALSE, /* pc_relative */
364 0, /* bitpos */
365 complain_overflow_bitfield,/* complain_on_overflow */
366 bfd_elf_generic_reloc, /* special_function */
367 "R_ARM_GLOB_DAT", /* name */
368 TRUE, /* partial_inplace */
369 0xffffffff, /* src_mask */
370 0xffffffff, /* dst_mask */
371 FALSE), /* pcrel_offset */
372
373 HOWTO (R_ARM_JUMP_SLOT, /* type */
374 0, /* rightshift */
375 2, /* size (0 = byte, 1 = short, 2 = long) */
376 32, /* bitsize */
377 FALSE, /* pc_relative */
378 0, /* bitpos */
379 complain_overflow_bitfield,/* complain_on_overflow */
380 bfd_elf_generic_reloc, /* special_function */
381 "R_ARM_JUMP_SLOT", /* name */
382 TRUE, /* partial_inplace */
383 0xffffffff, /* src_mask */
384 0xffffffff, /* dst_mask */
385 FALSE), /* pcrel_offset */
386
387 HOWTO (R_ARM_RELATIVE, /* type */
388 0, /* rightshift */
389 2, /* size (0 = byte, 1 = short, 2 = long) */
390 32, /* bitsize */
391 FALSE, /* pc_relative */
392 0, /* bitpos */
393 complain_overflow_bitfield,/* complain_on_overflow */
394 bfd_elf_generic_reloc, /* special_function */
395 "R_ARM_RELATIVE", /* name */
396 TRUE, /* partial_inplace */
397 0xffffffff, /* src_mask */
398 0xffffffff, /* dst_mask */
399 FALSE), /* pcrel_offset */
400
401 HOWTO (R_ARM_GOTOFF, /* type */
402 0, /* rightshift */
403 2, /* size (0 = byte, 1 = short, 2 = long) */
404 32, /* bitsize */
405 FALSE, /* pc_relative */
406 0, /* bitpos */
407 complain_overflow_bitfield,/* complain_on_overflow */
408 bfd_elf_generic_reloc, /* special_function */
409 "R_ARM_GOTOFF", /* name */
410 TRUE, /* partial_inplace */
411 0xffffffff, /* src_mask */
412 0xffffffff, /* dst_mask */
413 FALSE), /* pcrel_offset */
414
415 HOWTO (R_ARM_GOTPC, /* type */
416 0, /* rightshift */
417 2, /* size (0 = byte, 1 = short, 2 = long) */
418 32, /* bitsize */
419 TRUE, /* pc_relative */
420 0, /* bitpos */
421 complain_overflow_bitfield,/* complain_on_overflow */
422 bfd_elf_generic_reloc, /* special_function */
423 "R_ARM_GOTPC", /* name */
424 TRUE, /* partial_inplace */
425 0xffffffff, /* src_mask */
426 0xffffffff, /* dst_mask */
427 TRUE), /* pcrel_offset */
428
429 HOWTO (R_ARM_GOT32, /* type */
430 0, /* rightshift */
431 2, /* size (0 = byte, 1 = short, 2 = long) */
432 32, /* bitsize */
433 FALSE, /* pc_relative */
434 0, /* bitpos */
435 complain_overflow_bitfield,/* complain_on_overflow */
436 bfd_elf_generic_reloc, /* special_function */
437 "R_ARM_GOT32", /* name */
438 TRUE, /* partial_inplace */
439 0xffffffff, /* src_mask */
440 0xffffffff, /* dst_mask */
441 FALSE), /* pcrel_offset */
442
443 HOWTO (R_ARM_PLT32, /* type */
444 2, /* rightshift */
445 2, /* size (0 = byte, 1 = short, 2 = long) */
446 26, /* bitsize */
447 TRUE, /* pc_relative */
448 0, /* bitpos */
449 complain_overflow_bitfield,/* complain_on_overflow */
450 bfd_elf_generic_reloc, /* special_function */
451 "R_ARM_PLT32", /* name */
452 TRUE, /* partial_inplace */
453 0x00ffffff, /* src_mask */
454 0x00ffffff, /* dst_mask */
455 TRUE), /* pcrel_offset */
456
457 HOWTO (R_ARM_CALL, /* type */
458 2, /* rightshift */
459 2, /* size (0 = byte, 1 = short, 2 = long) */
460 24, /* bitsize */
461 TRUE, /* pc_relative */
462 0, /* bitpos */
463 complain_overflow_signed,/* complain_on_overflow */
464 bfd_elf_generic_reloc, /* special_function */
465 "R_ARM_CALL", /* name */
466 FALSE, /* partial_inplace */
467 0x00ffffff, /* src_mask */
468 0x00ffffff, /* dst_mask */
469 TRUE), /* pcrel_offset */
470
471 HOWTO (R_ARM_JUMP24, /* type */
472 2, /* rightshift */
473 2, /* size (0 = byte, 1 = short, 2 = long) */
474 24, /* bitsize */
475 TRUE, /* pc_relative */
476 0, /* bitpos */
477 complain_overflow_signed,/* complain_on_overflow */
478 bfd_elf_generic_reloc, /* special_function */
479 "R_ARM_JUMP24", /* name */
480 FALSE, /* partial_inplace */
481 0x00ffffff, /* src_mask */
482 0x00ffffff, /* dst_mask */
483 TRUE), /* pcrel_offset */
484
485 HOWTO (R_ARM_NONE, /* type */
486 0, /* rightshift */
487 0, /* size (0 = byte, 1 = short, 2 = long) */
488 0, /* bitsize */
489 FALSE, /* pc_relative */
490 0, /* bitpos */
491 complain_overflow_dont,/* complain_on_overflow */
492 bfd_elf_generic_reloc, /* special_function */
493 "R_ARM_unknown_30", /* name */
494 FALSE, /* partial_inplace */
495 0, /* src_mask */
496 0, /* dst_mask */
497 FALSE), /* pcrel_offset */
498
499 HOWTO (R_ARM_NONE, /* type */
500 0, /* rightshift */
501 0, /* size (0 = byte, 1 = short, 2 = long) */
502 0, /* bitsize */
503 FALSE, /* pc_relative */
504 0, /* bitpos */
505 complain_overflow_dont,/* complain_on_overflow */
506 bfd_elf_generic_reloc, /* special_function */
507 "R_ARM_unknown_31", /* name */
508 FALSE, /* partial_inplace */
509 0, /* src_mask */
510 0, /* dst_mask */
511 FALSE), /* pcrel_offset */
512
513 HOWTO (R_ARM_ALU_PCREL7_0, /* type */
514 0, /* rightshift */
515 2, /* size (0 = byte, 1 = short, 2 = long) */
516 12, /* bitsize */
517 TRUE, /* pc_relative */
518 0, /* bitpos */
519 complain_overflow_dont,/* complain_on_overflow */
520 bfd_elf_generic_reloc, /* special_function */
521 "R_ARM_ALU_PCREL_7_0", /* name */
522 FALSE, /* partial_inplace */
523 0x00000fff, /* src_mask */
524 0x00000fff, /* dst_mask */
525 TRUE), /* pcrel_offset */
526
527 HOWTO (R_ARM_ALU_PCREL15_8, /* type */
528 0, /* rightshift */
529 2, /* size (0 = byte, 1 = short, 2 = long) */
530 12, /* bitsize */
531 TRUE, /* pc_relative */
532 8, /* bitpos */
533 complain_overflow_dont,/* complain_on_overflow */
534 bfd_elf_generic_reloc, /* special_function */
535 "R_ARM_ALU_PCREL_15_8",/* name */
536 FALSE, /* partial_inplace */
537 0x00000fff, /* src_mask */
538 0x00000fff, /* dst_mask */
539 TRUE), /* pcrel_offset */
540
541 HOWTO (R_ARM_ALU_PCREL23_15, /* type */
542 0, /* rightshift */
543 2, /* size (0 = byte, 1 = short, 2 = long) */
544 12, /* bitsize */
545 TRUE, /* pc_relative */
546 16, /* bitpos */
547 complain_overflow_dont,/* complain_on_overflow */
548 bfd_elf_generic_reloc, /* special_function */
549 "R_ARM_ALU_PCREL_23_15",/* name */
550 FALSE, /* partial_inplace */
551 0x00000fff, /* src_mask */
552 0x00000fff, /* dst_mask */
553 TRUE), /* pcrel_offset */
554
555 HOWTO (R_ARM_LDR_SBREL_11_0, /* type */
556 0, /* rightshift */
557 2, /* size (0 = byte, 1 = short, 2 = long) */
558 12, /* bitsize */
559 FALSE, /* pc_relative */
560 0, /* bitpos */
561 complain_overflow_dont,/* complain_on_overflow */
562 bfd_elf_generic_reloc, /* special_function */
563 "R_ARM_LDR_SBREL_11_0",/* name */
564 FALSE, /* partial_inplace */
565 0x00000fff, /* src_mask */
566 0x00000fff, /* dst_mask */
567 FALSE), /* pcrel_offset */
568
569 HOWTO (R_ARM_ALU_SBREL_19_12, /* type */
570 0, /* rightshift */
571 2, /* size (0 = byte, 1 = short, 2 = long) */
572 8, /* bitsize */
573 FALSE, /* pc_relative */
574 12, /* bitpos */
575 complain_overflow_dont,/* complain_on_overflow */
576 bfd_elf_generic_reloc, /* special_function */
577 "R_ARM_ALU_SBREL_19_12",/* name */
578 FALSE, /* partial_inplace */
579 0x000ff000, /* src_mask */
580 0x000ff000, /* dst_mask */
581 FALSE), /* pcrel_offset */
582
583 HOWTO (R_ARM_ALU_SBREL_27_20, /* type */
584 0, /* rightshift */
585 2, /* size (0 = byte, 1 = short, 2 = long) */
586 8, /* bitsize */
587 FALSE, /* pc_relative */
588 20, /* bitpos */
589 complain_overflow_dont,/* complain_on_overflow */
590 bfd_elf_generic_reloc, /* special_function */
591 "R_ARM_ALU_SBREL_27_20",/* name */
592 FALSE, /* partial_inplace */
593 0x0ff00000, /* src_mask */
594 0x0ff00000, /* dst_mask */
595 FALSE), /* pcrel_offset */
596
597 HOWTO (R_ARM_TARGET1, /* type */
598 0, /* rightshift */
599 2, /* size (0 = byte, 1 = short, 2 = long) */
600 32, /* bitsize */
601 FALSE, /* pc_relative */
602 0, /* bitpos */
603 complain_overflow_dont,/* complain_on_overflow */
604 bfd_elf_generic_reloc, /* special_function */
605 "R_ARM_TARGET1", /* name */
606 FALSE, /* partial_inplace */
607 0xffffffff, /* src_mask */
608 0xffffffff, /* dst_mask */
609 FALSE), /* pcrel_offset */
610
611 HOWTO (R_ARM_ROSEGREL32, /* type */
612 0, /* rightshift */
613 2, /* size (0 = byte, 1 = short, 2 = long) */
614 32, /* bitsize */
615 FALSE, /* pc_relative */
616 0, /* bitpos */
617 complain_overflow_dont,/* complain_on_overflow */
618 bfd_elf_generic_reloc, /* special_function */
619 "R_ARM_ROSEGREL32", /* name */
620 FALSE, /* partial_inplace */
621 0xffffffff, /* src_mask */
622 0xffffffff, /* dst_mask */
623 FALSE), /* pcrel_offset */
624
625 HOWTO (R_ARM_V4BX, /* type */
626 0, /* rightshift */
627 2, /* size (0 = byte, 1 = short, 2 = long) */
628 32, /* bitsize */
629 FALSE, /* pc_relative */
630 0, /* bitpos */
631 complain_overflow_dont,/* complain_on_overflow */
632 bfd_elf_generic_reloc, /* special_function */
633 "R_ARM_V4BX", /* name */
634 FALSE, /* partial_inplace */
635 0xffffffff, /* src_mask */
636 0xffffffff, /* dst_mask */
637 FALSE), /* pcrel_offset */
638
639 HOWTO (R_ARM_TARGET2, /* 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_signed,/* complain_on_overflow */
646 bfd_elf_generic_reloc, /* special_function */
647 "R_ARM_TARGET2", /* name */
648 FALSE, /* partial_inplace */
649 0xffffffff, /* src_mask */
650 0xffffffff, /* dst_mask */
651 TRUE), /* pcrel_offset */
652
653 HOWTO (R_ARM_PREL31, /* type */
654 0, /* rightshift */
655 2, /* size (0 = byte, 1 = short, 2 = long) */
656 31, /* bitsize */
657 TRUE, /* pc_relative */
658 0, /* bitpos */
659 complain_overflow_signed,/* complain_on_overflow */
660 bfd_elf_generic_reloc, /* special_function */
661 "R_ARM_PREL31", /* name */
662 FALSE, /* partial_inplace */
663 0x7fffffff, /* src_mask */
664 0x7fffffff, /* dst_mask */
665 TRUE), /* pcrel_offset */
666};
667
668 /* GNU extension to record C++ vtable hierarchy */
669static reloc_howto_type elf32_arm_vtinherit_howto =
670 HOWTO (R_ARM_GNU_VTINHERIT, /* type */
671 0, /* rightshift */
672 2, /* size (0 = byte, 1 = short, 2 = long) */
673 0, /* bitsize */
674 FALSE, /* pc_relative */
675 0, /* bitpos */
676 complain_overflow_dont, /* complain_on_overflow */
677 NULL, /* special_function */
678 "R_ARM_GNU_VTINHERIT", /* name */
679 FALSE, /* partial_inplace */
680 0, /* src_mask */
681 0, /* dst_mask */
682 FALSE); /* pcrel_offset */
683
684 /* GNU extension to record C++ vtable member usage */
685static reloc_howto_type elf32_arm_vtentry_howto =
686 HOWTO (R_ARM_GNU_VTENTRY, /* type */
687 0, /* rightshift */
688 2, /* size (0 = byte, 1 = short, 2 = long) */
689 0, /* bitsize */
690 FALSE, /* pc_relative */
691 0, /* bitpos */
692 complain_overflow_dont, /* complain_on_overflow */
693 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
694 "R_ARM_GNU_VTENTRY", /* name */
695 FALSE, /* partial_inplace */
696 0, /* src_mask */
697 0, /* dst_mask */
698 FALSE); /* pcrel_offset */
699
700 /* 12 bit pc relative */
701static reloc_howto_type elf32_arm_thm_pc11_howto =
702 HOWTO (R_ARM_THM_PC11, /* type */
703 1, /* rightshift */
704 1, /* size (0 = byte, 1 = short, 2 = long) */
705 11, /* bitsize */
706 TRUE, /* pc_relative */
707 0, /* bitpos */
708 complain_overflow_signed, /* complain_on_overflow */
709 bfd_elf_generic_reloc, /* special_function */
710 "R_ARM_THM_PC11", /* name */
711 FALSE, /* partial_inplace */
712 0x000007ff, /* src_mask */
713 0x000007ff, /* dst_mask */
714 TRUE); /* pcrel_offset */
715
716 /* 12 bit pc relative */
717static reloc_howto_type elf32_arm_thm_pc9_howto =
718 HOWTO (R_ARM_THM_PC9, /* type */
719 1, /* rightshift */
720 1, /* size (0 = byte, 1 = short, 2 = long) */
721 8, /* bitsize */
722 TRUE, /* pc_relative */
723 0, /* bitpos */
724 complain_overflow_signed, /* complain_on_overflow */
725 bfd_elf_generic_reloc, /* special_function */
726 "R_ARM_THM_PC9", /* name */
727 FALSE, /* partial_inplace */
728 0x000000ff, /* src_mask */
729 0x000000ff, /* dst_mask */
730 TRUE); /* pcrel_offset */
731
732/* Place relative GOT-indirect. */
733static reloc_howto_type elf32_arm_got_prel =
734 HOWTO (R_ARM_GOT_PREL, /* type */
735 0, /* rightshift */
736 2, /* size (0 = byte, 1 = short, 2 = long) */
737 32, /* bitsize */
738 TRUE, /* pc_relative */
739 0, /* bitpos */
740 complain_overflow_dont, /* complain_on_overflow */
741 bfd_elf_generic_reloc, /* special_function */
742 "R_ARM_GOT_PREL", /* name */
743 FALSE, /* partial_inplace */
744 0xffffffff, /* src_mask */
745 0xffffffff, /* dst_mask */
746 TRUE); /* pcrel_offset */
747
748/* Currently unused relocations. */
749static reloc_howto_type elf32_arm_r_howto[4] =
750{
751 HOWTO (R_ARM_RREL32, /* type */
752 0, /* rightshift */
753 0, /* size (0 = byte, 1 = short, 2 = long) */
754 0, /* bitsize */
755 FALSE, /* pc_relative */
756 0, /* bitpos */
757 complain_overflow_dont,/* complain_on_overflow */
758 bfd_elf_generic_reloc, /* special_function */
759 "R_ARM_RREL32", /* name */
760 FALSE, /* partial_inplace */
761 0, /* src_mask */
762 0, /* dst_mask */
763 FALSE), /* pcrel_offset */
764
765 HOWTO (R_ARM_RABS32, /* type */
766 0, /* rightshift */
767 0, /* size (0 = byte, 1 = short, 2 = long) */
768 0, /* bitsize */
769 FALSE, /* pc_relative */
770 0, /* bitpos */
771 complain_overflow_dont,/* complain_on_overflow */
772 bfd_elf_generic_reloc, /* special_function */
773 "R_ARM_RABS32", /* name */
774 FALSE, /* partial_inplace */
775 0, /* src_mask */
776 0, /* dst_mask */
777 FALSE), /* pcrel_offset */
778
779 HOWTO (R_ARM_RPC24, /* type */
780 0, /* rightshift */
781 0, /* size (0 = byte, 1 = short, 2 = long) */
782 0, /* bitsize */
783 FALSE, /* pc_relative */
784 0, /* bitpos */
785 complain_overflow_dont,/* complain_on_overflow */
786 bfd_elf_generic_reloc, /* special_function */
787 "R_ARM_RPC24", /* name */
788 FALSE, /* partial_inplace */
789 0, /* src_mask */
790 0, /* dst_mask */
791 FALSE), /* pcrel_offset */
792
793 HOWTO (R_ARM_RBASE, /* type */
794 0, /* rightshift */
795 0, /* size (0 = byte, 1 = short, 2 = long) */
796 0, /* bitsize */
797 FALSE, /* pc_relative */
798 0, /* bitpos */
799 complain_overflow_dont,/* complain_on_overflow */
800 bfd_elf_generic_reloc, /* special_function */
801 "R_ARM_RBASE", /* name */
802 FALSE, /* partial_inplace */
803 0, /* src_mask */
804 0, /* dst_mask */
805 FALSE) /* pcrel_offset */
806};
807
808static reloc_howto_type *
809elf32_arm_howto_from_type (unsigned int r_type)
810{
811 if (r_type < NUM_ELEM (elf32_arm_howto_table))
812 return &elf32_arm_howto_table[r_type];
813
814 switch (r_type)
815 {
816 case R_ARM_GOT_PREL:
817 return &elf32_arm_got_prel;
818
819 case R_ARM_GNU_VTINHERIT:
820 return &elf32_arm_vtinherit_howto;
821
822 case R_ARM_GNU_VTENTRY:
823 return &elf32_arm_vtentry_howto;
824
825 case R_ARM_THM_PC11:
826 return &elf32_arm_thm_pc11_howto;
827
828 case R_ARM_THM_PC9:
829 return &elf32_arm_thm_pc9_howto;
830
831 case R_ARM_RREL32:
832 case R_ARM_RABS32:
833 case R_ARM_RPC24:
834 case R_ARM_RBASE:
835 return &elf32_arm_r_howto[r_type - R_ARM_RREL32];
836
837 default:
838 return NULL;
839 }
840}
841
842static void
843elf32_arm_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED, arelent * bfd_reloc,
844 Elf_Internal_Rela * elf_reloc)
845{
846 unsigned int r_type;
847
848 r_type = ELF32_R_TYPE (elf_reloc->r_info);
849 bfd_reloc->howto = elf32_arm_howto_from_type (r_type);
850}
851
852struct elf32_arm_reloc_map
853 {
854 bfd_reloc_code_real_type bfd_reloc_val;
855 unsigned char elf_reloc_val;
856 };
857
858/* All entries in this list must also be present in elf32_arm_howto_table. */
859static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
860 {
861 {BFD_RELOC_NONE, R_ARM_NONE},
862 {BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24},
863 {BFD_RELOC_ARM_PCREL_BLX, R_ARM_XPC25},
864 {BFD_RELOC_THUMB_PCREL_BLX, R_ARM_THM_XPC22},
865 {BFD_RELOC_32, R_ARM_ABS32},
866 {BFD_RELOC_32_PCREL, R_ARM_REL32},
867 {BFD_RELOC_8, R_ARM_ABS8},
868 {BFD_RELOC_16, R_ARM_ABS16},
869 {BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12},
870 {BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5},
871 {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22},
872 {BFD_RELOC_ARM_COPY, R_ARM_COPY},
873 {BFD_RELOC_ARM_GLOB_DAT, R_ARM_GLOB_DAT},
874 {BFD_RELOC_ARM_JUMP_SLOT, R_ARM_JUMP_SLOT},
875 {BFD_RELOC_ARM_RELATIVE, R_ARM_RELATIVE},
876 {BFD_RELOC_ARM_GOTOFF, R_ARM_GOTOFF},
877 {BFD_RELOC_ARM_GOTPC, R_ARM_GOTPC},
878 {BFD_RELOC_ARM_GOT32, R_ARM_GOT32},
879 {BFD_RELOC_ARM_PLT32, R_ARM_PLT32},
880 {BFD_RELOC_ARM_TARGET1, R_ARM_TARGET1},
881 {BFD_RELOC_ARM_ROSEGREL32, R_ARM_ROSEGREL32},
882 {BFD_RELOC_ARM_SBREL32, R_ARM_SBREL32},
883 {BFD_RELOC_ARM_PREL31, R_ARM_PREL31},
884 {BFD_RELOC_ARM_TARGET2, R_ARM_TARGET2}
885 };
886
887static reloc_howto_type *
888elf32_arm_reloc_type_lookup (abfd, code)
889 bfd *abfd ATTRIBUTE_UNUSED;
890 bfd_reloc_code_real_type code;
891{
892 unsigned int i;
893
894 switch (code)
895 {
896 case BFD_RELOC_VTABLE_INHERIT:
897 return & elf32_arm_vtinherit_howto;
898
899 case BFD_RELOC_VTABLE_ENTRY:
900 return & elf32_arm_vtentry_howto;
901
902 case BFD_RELOC_THUMB_PCREL_BRANCH12:
903 return & elf32_arm_thm_pc11_howto;
904
905 case BFD_RELOC_THUMB_PCREL_BRANCH9:
906 return & elf32_arm_thm_pc9_howto;
907
908 default:
909 for (i = 0; i < NUM_ELEM (elf32_arm_reloc_map); i ++)
910 if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
911 return & elf32_arm_howto_table[elf32_arm_reloc_map[i].elf_reloc_val];
912
913 return NULL;
914 }
915}
916
917/* Support for core dump NOTE sections */
918static bfd_boolean
919elf32_arm_nabi_grok_prstatus (abfd, note)
920 bfd *abfd;
921 Elf_Internal_Note *note;
922{
923 int offset;
924 size_t size;
925
926 switch (note->descsz)
927 {
928 default:
929 return FALSE;
930
931 case 148: /* Linux/ARM 32-bit*/
932 /* pr_cursig */
933 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
934
935 /* pr_pid */
936 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
937
938 /* pr_reg */
939 offset = 72;
940 size = 72;
941
942 break;
943 }
944
945 /* Make a ".reg/999" section. */
946 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
947 size, note->descpos + offset);
948}
949
950static bfd_boolean
951elf32_arm_nabi_grok_psinfo (abfd, note)
952 bfd *abfd;
953 Elf_Internal_Note *note;
954{
955 switch (note->descsz)
956 {
957 default:
958 return FALSE;
959
960 case 124: /* Linux/ARM elf_prpsinfo */
961 elf_tdata (abfd)->core_program
962 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
963 elf_tdata (abfd)->core_command
964 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
965 }
966
967 /* Note that for some reason, a spurious space is tacked
968 onto the end of the args in some (at least one anyway)
969 implementations, so strip it off if it exists. */
970
971 {
972 char *command = elf_tdata (abfd)->core_command;
973 int n = strlen (command);
974
975 if (0 < n && command[n - 1] == ' ')
976 command[n - 1] = '\0';
977 }
978
979 return TRUE;
980}
981
982#define TARGET_LITTLE_SYM bfd_elf32_littlearm_vec
983#define TARGET_LITTLE_NAME "elf32-littlearm"
984#define TARGET_BIG_SYM bfd_elf32_bigarm_vec
985#define TARGET_BIG_NAME "elf32-bigarm"
986
987#define elf_backend_grok_prstatus elf32_arm_nabi_grok_prstatus
988#define elf_backend_grok_psinfo elf32_arm_nabi_grok_psinfo
989
990#ifndef USE_REL
991#define USE_REL 0
992#endif
993
994typedef unsigned long int insn32;
995typedef unsigned short int insn16;
996
997/* In lieu of proper flags, assume all EABIv4 objects are interworkable. */
998#define INTERWORK_FLAG(abfd) \
999 (EF_ARM_EABI_VERSION (elf_elfheader (abfd)->e_flags) == EF_ARM_EABI_VER4 \
1000 || (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK))
1001
1002/* The linker script knows the section names for placement.
1003 The entry_names are used to do simple name mangling on the stubs.
1004 Given a function name, and its type, the stub can be found. The
1005 name can be changed. The only requirement is the %s be present. */
1006#define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
1007#define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
1008
1009#define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
1010#define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
1011
1012/* The name of the dynamic interpreter. This is put in the .interp
1013 section. */
1014#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
1015
1016#ifdef FOUR_WORD_PLT
1017
1018/* The first entry in a procedure linkage table looks like
1019 this. It is set up so that any shared library function that is
1020 called before the relocation has been set up calls the dynamic
1021 linker first. */
1022static const bfd_vma elf32_arm_plt0_entry [] =
1023 {
1024 0xe52de004, /* str lr, [sp, #-4]! */
1025 0xe59fe010, /* ldr lr, [pc, #16] */
1026 0xe08fe00e, /* add lr, pc, lr */
1027 0xe5bef008, /* ldr pc, [lr, #8]! */
1028 };
1029
1030/* Subsequent entries in a procedure linkage table look like
1031 this. */
1032static const bfd_vma elf32_arm_plt_entry [] =
1033 {
1034 0xe28fc600, /* add ip, pc, #NN */
1035 0xe28cca00, /* add ip, ip, #NN */
1036 0xe5bcf000, /* ldr pc, [ip, #NN]! */
1037 0x00000000, /* unused */
1038 };
1039
1040#else
1041
1042/* The first entry in a procedure linkage table looks like
1043 this. It is set up so that any shared library function that is
1044 called before the relocation has been set up calls the dynamic
1045 linker first. */
1046static const bfd_vma elf32_arm_plt0_entry [] =
1047 {
1048 0xe52de004, /* str lr, [sp, #-4]! */
1049 0xe59fe004, /* ldr lr, [pc, #4] */
1050 0xe08fe00e, /* add lr, pc, lr */
1051 0xe5bef008, /* ldr pc, [lr, #8]! */
1052 0x00000000, /* &GOT[0] - . */
1053 };
1054
1055/* Subsequent entries in a procedure linkage table look like
1056 this. */
1057static const bfd_vma elf32_arm_plt_entry [] =
1058 {
1059 0xe28fc600, /* add ip, pc, #0xNN00000 */
1060 0xe28cca00, /* add ip, ip, #0xNN000 */
1061 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */
1062 };
1063
1064#endif
1065
1066/* The entries in a PLT when using a DLL-based target with multiple
1067 address spaces. */
1068static const bfd_vma elf32_arm_symbian_plt_entry [] =
1069 {
1070 0xe51ff004, /* ldr pr, [pc, #-4] */
1071 0x00000000, /* dcd R_ARM_GLOB_DAT(X) */
1072 };
1073
1074/* Used to build a map of a section. This is required for mixed-endian
1075 code/data. */
1076
1077typedef struct elf32_elf_section_map
1078{
1079 bfd_vma vma;
1080 char type;
1081}
1082elf32_arm_section_map;
1083
1084struct _arm_elf_section_data
1085{
1086 struct bfd_elf_section_data elf;
1087 int mapcount;
1088 elf32_arm_section_map *map;
1089};
1090
1091#define elf32_arm_section_data(sec) \
1092 ((struct _arm_elf_section_data *) elf_section_data (sec))
1093
1094/* The ARM linker needs to keep track of the number of relocs that it
1095 decides to copy in check_relocs for each symbol. This is so that
1096 it can discard PC relative relocs if it doesn't need them when
1097 linking with -Bsymbolic. We store the information in a field
1098 extending the regular ELF linker hash table. */
1099
1100/* This structure keeps track of the number of PC relative relocs we
1101 have copied for a given symbol. */
1102struct elf32_arm_relocs_copied
1103 {
1104 /* Next section. */
1105 struct elf32_arm_relocs_copied * next;
1106 /* A section in dynobj. */
1107 asection * section;
1108 /* Number of relocs copied in this section. */
1109 bfd_size_type count;
1110 };
1111
1112/* Arm ELF linker hash entry. */
1113struct elf32_arm_link_hash_entry
1114 {
1115 struct elf_link_hash_entry root;
1116
1117 /* Number of PC relative relocs copied for this symbol. */
1118 struct elf32_arm_relocs_copied * relocs_copied;
1119 };
1120
1121/* Traverse an arm ELF linker hash table. */
1122#define elf32_arm_link_hash_traverse(table, func, info) \
1123 (elf_link_hash_traverse \
1124 (&(table)->root, \
1125 (bfd_boolean (*) (struct elf_link_hash_entry *, void *))) (func), \
1126 (info)))
1127
1128/* Get the ARM elf linker hash table from a link_info structure. */
1129#define elf32_arm_hash_table(info) \
1130 ((struct elf32_arm_link_hash_table *) ((info)->hash))
1131
1132/* ARM ELF linker hash table. */
1133struct elf32_arm_link_hash_table
1134 {
1135 /* The main hash table. */
1136 struct elf_link_hash_table root;
1137
1138 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
1139 bfd_size_type thumb_glue_size;
1140
1141 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
1142 bfd_size_type arm_glue_size;
1143
1144 /* An arbitrary input BFD chosen to hold the glue sections. */
1145 bfd * bfd_of_glue_owner;
1146
1147 /* A boolean indicating whether knowledge of the ARM's pipeline
1148 length should be applied by the linker. */
1149 int no_pipeline_knowledge;
1150
1151 /* Nonzero to output a BE8 image. */
1152 int byteswap_code;
1153
1154 /* Zero if R_ARM_TARGET1 means R_ARM_ABS32.
1155 Nonzero if R_ARM_TARGET1 means R_ARM_ABS32. */
1156 int target1_is_rel;
1157
1158 /* The relocation to use for R_ARM_TARGET2 relocations. */
1159 int target2_reloc;
1160
1161 /* The number of bytes in the initial entry in the PLT. */
1162 bfd_size_type plt_header_size;
1163
1164 /* The number of bytes in the subsequent PLT etries. */
1165 bfd_size_type plt_entry_size;
1166
1167 /* True if the target system is Symbian OS. */
1168 int symbian_p;
1169
1170 /* Short-cuts to get to dynamic linker sections. */
1171 asection *sgot;
1172 asection *sgotplt;
1173 asection *srelgot;
1174 asection *splt;
1175 asection *srelplt;
1176 asection *sdynbss;
1177 asection *srelbss;
1178
1179 /* Small local sym to section mapping cache. */
1180 struct sym_sec_cache sym_sec;
1181 };
1182
1183/* Create an entry in an ARM ELF linker hash table. */
1184
1185static struct bfd_hash_entry *
1186elf32_arm_link_hash_newfunc (struct bfd_hash_entry * entry,
1187 struct bfd_hash_table * table,
1188 const char * string)
1189{
1190 struct elf32_arm_link_hash_entry * ret =
1191 (struct elf32_arm_link_hash_entry *) entry;
1192
1193 /* Allocate the structure if it has not already been allocated by a
1194 subclass. */
1195 if (ret == (struct elf32_arm_link_hash_entry *) NULL)
1196 ret = bfd_hash_allocate (table, sizeof (struct elf32_arm_link_hash_entry));
1197 if (ret == NULL)
1198 return (struct bfd_hash_entry *) ret;
1199
1200 /* Call the allocation method of the superclass. */
1201 ret = ((struct elf32_arm_link_hash_entry *)
1202 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
1203 table, string));
1204 if (ret != NULL)
1205 ret->relocs_copied = NULL;
1206
1207 return (struct bfd_hash_entry *) ret;
1208}
1209
1210/* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
1211 shortcuts to them in our hash table. */
1212
1213static bfd_boolean
1214create_got_section (bfd *dynobj, struct bfd_link_info *info)
1215{
1216 struct elf32_arm_link_hash_table *htab;
1217
1218 htab = elf32_arm_hash_table (info);
1219 /* BPABI objects never have a GOT, or associated sections. */
1220 if (htab->symbian_p)
1221 return TRUE;
1222
1223 if (! _bfd_elf_create_got_section (dynobj, info))
1224 return FALSE;
1225
1226 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1227 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1228 if (!htab->sgot || !htab->sgotplt)
1229 abort ();
1230
1231 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
1232 if (htab->srelgot == NULL
1233 || ! bfd_set_section_flags (dynobj, htab->srelgot,
1234 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1235 | SEC_IN_MEMORY | SEC_LINKER_CREATED
1236 | SEC_READONLY))
1237 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1238 return FALSE;
1239 return TRUE;
1240}
1241
1242/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1243 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1244 hash table. */
1245
1246static bfd_boolean
1247elf32_arm_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1248{
1249 struct elf32_arm_link_hash_table *htab;
1250
1251 htab = elf32_arm_hash_table (info);
1252 if (!htab->sgot && !create_got_section (dynobj, info))
1253 return FALSE;
1254
1255 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1256 return FALSE;
1257
1258 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1259 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
1260 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
1261 if (!info->shared)
1262 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
1263
1264 if (!htab->splt
1265 || !htab->srelplt
1266 || !htab->sdynbss
1267 || (!info->shared && !htab->srelbss))
1268 abort ();
1269
1270 return TRUE;
1271}
1272
1273/* Copy the extra info we tack onto an elf_link_hash_entry. */
1274
1275static void
1276elf32_arm_copy_indirect_symbol (const struct elf_backend_data *bed,
1277 struct elf_link_hash_entry *dir,
1278 struct elf_link_hash_entry *ind)
1279{
1280 struct elf32_arm_link_hash_entry *edir, *eind;
1281
1282 edir = (struct elf32_arm_link_hash_entry *) dir;
1283 eind = (struct elf32_arm_link_hash_entry *) ind;
1284
1285 if (eind->relocs_copied != NULL)
1286 {
1287 if (edir->relocs_copied != NULL)
1288 {
1289 struct elf32_arm_relocs_copied **pp;
1290 struct elf32_arm_relocs_copied *p;
1291
1292 if (ind->root.type == bfd_link_hash_indirect)
1293 abort ();
1294
1295 /* Add reloc counts against the weak sym to the strong sym
1296 list. Merge any entries against the same section. */
1297 for (pp = &eind->relocs_copied; (p = *pp) != NULL; )
1298 {
1299 struct elf32_arm_relocs_copied *q;
1300
1301 for (q = edir->relocs_copied; q != NULL; q = q->next)
1302 if (q->section == p->section)
1303 {
1304 q->count += p->count;
1305 *pp = p->next;
1306 break;
1307 }
1308 if (q == NULL)
1309 pp = &p->next;
1310 }
1311 *pp = edir->relocs_copied;
1312 }
1313
1314 edir->relocs_copied = eind->relocs_copied;
1315 eind->relocs_copied = NULL;
1316 }
1317
1318 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
1319}
1320
1321/* Create an ARM elf linker hash table. */
1322
1323static struct bfd_link_hash_table *
1324elf32_arm_link_hash_table_create (bfd *abfd)
1325{
1326 struct elf32_arm_link_hash_table *ret;
1327 bfd_size_type amt = sizeof (struct elf32_arm_link_hash_table);
1328
1329 ret = bfd_malloc (amt);
1330 if (ret == NULL)
1331 return NULL;
1332
1333 if (!_bfd_elf_link_hash_table_init (& ret->root, abfd,
1334 elf32_arm_link_hash_newfunc))
1335 {
1336 free (ret);
1337 return NULL;
1338 }
1339
1340 ret->sgot = NULL;
1341 ret->sgotplt = NULL;
1342 ret->srelgot = NULL;
1343 ret->splt = NULL;
1344 ret->srelplt = NULL;
1345 ret->sdynbss = NULL;
1346 ret->srelbss = NULL;
1347 ret->thumb_glue_size = 0;
1348 ret->arm_glue_size = 0;
1349 ret->bfd_of_glue_owner = NULL;
1350 ret->no_pipeline_knowledge = 0;
1351 ret->byteswap_code = 0;
1352 ret->target1_is_rel = 0;
1353 ret->target2_reloc = R_ARM_NONE;
1354#ifdef FOUR_WORD_PLT
1355 ret->plt_header_size = 16;
1356 ret->plt_entry_size = 16;
1357#else
1358 ret->plt_header_size = 20;
1359 ret->plt_entry_size = 12;
1360#endif
1361 ret->symbian_p = 0;
1362 ret->sym_sec.abfd = NULL;
1363
1364 return &ret->root.root;
1365}
1366
1367/* Locate the Thumb encoded calling stub for NAME. */
1368
1369static struct elf_link_hash_entry *
1370find_thumb_glue (struct bfd_link_info *link_info,
1371 const char *name,
1372 bfd *input_bfd)
1373{
1374 char *tmp_name;
1375 struct elf_link_hash_entry *hash;
1376 struct elf32_arm_link_hash_table *hash_table;
1377
1378 /* We need a pointer to the armelf specific hash table. */
1379 hash_table = elf32_arm_hash_table (link_info);
1380
1381 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1382 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1383
1384 BFD_ASSERT (tmp_name);
1385
1386 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1387
1388 hash = elf_link_hash_lookup
1389 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1390
1391 if (hash == NULL)
1392 /* xgettext:c-format */
1393 (*_bfd_error_handler) (_("%B: unable to find THUMB glue '%s' for `%s'"),
1394 input_bfd, tmp_name, name);
1395
1396 free (tmp_name);
1397
1398 return hash;
1399}
1400
1401/* Locate the ARM encoded calling stub for NAME. */
1402
1403static struct elf_link_hash_entry *
1404find_arm_glue (struct bfd_link_info *link_info,
1405 const char *name,
1406 bfd *input_bfd)
1407{
1408 char *tmp_name;
1409 struct elf_link_hash_entry *myh;
1410 struct elf32_arm_link_hash_table *hash_table;
1411
1412 /* We need a pointer to the elfarm specific hash table. */
1413 hash_table = elf32_arm_hash_table (link_info);
1414
1415 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1416 + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1);
1417
1418 BFD_ASSERT (tmp_name);
1419
1420 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1421
1422 myh = elf_link_hash_lookup
1423 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1424
1425 if (myh == NULL)
1426 /* xgettext:c-format */
1427 (*_bfd_error_handler) (_("%B: unable to find ARM glue '%s' for `%s'"),
1428 input_bfd, tmp_name, name);
1429
1430 free (tmp_name);
1431
1432 return myh;
1433}
1434
1435/* ARM->Thumb glue:
1436
1437 .arm
1438 __func_from_arm:
1439 ldr r12, __func_addr
1440 bx r12
1441 __func_addr:
1442 .word func @ behave as if you saw a ARM_32 reloc. */
1443
1444#define ARM2THUMB_GLUE_SIZE 12
1445static const insn32 a2t1_ldr_insn = 0xe59fc000;
1446static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1447static const insn32 a2t3_func_addr_insn = 0x00000001;
1448
1449/* Thumb->ARM: Thumb->(non-interworking aware) ARM
1450
1451 .thumb .thumb
1452 .align 2 .align 2
1453 __func_from_thumb: __func_from_thumb:
1454 bx pc push {r6, lr}
1455 nop ldr r6, __func_addr
1456 .arm mov lr, pc
1457 __func_change_to_arm: bx r6
1458 b func .arm
1459 __func_back_to_thumb:
1460 ldmia r13! {r6, lr}
1461 bx lr
1462 __func_addr:
1463 .word func */
1464
1465#define THUMB2ARM_GLUE_SIZE 8
1466static const insn16 t2a1_bx_pc_insn = 0x4778;
1467static const insn16 t2a2_noop_insn = 0x46c0;
1468static const insn32 t2a3_b_insn = 0xea000000;
1469
1470#ifndef ELFARM_NABI_C_INCLUDED
1471bfd_boolean
1472bfd_elf32_arm_allocate_interworking_sections (struct bfd_link_info * info)
1473{
1474 asection * s;
1475 bfd_byte * foo;
1476 struct elf32_arm_link_hash_table * globals;
1477
1478 globals = elf32_arm_hash_table (info);
1479
1480 BFD_ASSERT (globals != NULL);
1481
1482 if (globals->arm_glue_size != 0)
1483 {
1484 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1485
1486 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1487 ARM2THUMB_GLUE_SECTION_NAME);
1488
1489 BFD_ASSERT (s != NULL);
1490
1491 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1492
1493 s->size = globals->arm_glue_size;
1494 s->contents = foo;
1495 }
1496
1497 if (globals->thumb_glue_size != 0)
1498 {
1499 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1500
1501 s = bfd_get_section_by_name
1502 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1503
1504 BFD_ASSERT (s != NULL);
1505
1506 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1507
1508 s->size = globals->thumb_glue_size;
1509 s->contents = foo;
1510 }
1511
1512 return TRUE;
1513}
1514
1515static void
1516record_arm_to_thumb_glue (struct bfd_link_info * link_info,
1517 struct elf_link_hash_entry * h)
1518{
1519 const char * name = h->root.root.string;
1520 asection * s;
1521 char * tmp_name;
1522 struct elf_link_hash_entry * myh;
1523 struct bfd_link_hash_entry * bh;
1524 struct elf32_arm_link_hash_table * globals;
1525 bfd_vma val;
1526
1527 globals = elf32_arm_hash_table (link_info);
1528
1529 BFD_ASSERT (globals != NULL);
1530 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1531
1532 s = bfd_get_section_by_name
1533 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1534
1535 BFD_ASSERT (s != NULL);
1536
1537 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1);
1538
1539 BFD_ASSERT (tmp_name);
1540
1541 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1542
1543 myh = elf_link_hash_lookup
1544 (&(globals)->root, tmp_name, FALSE, FALSE, TRUE);
1545
1546 if (myh != NULL)
1547 {
1548 /* We've already seen this guy. */
1549 free (tmp_name);
1550 return;
1551 }
1552
1553 /* The only trick here is using hash_table->arm_glue_size as the value.
1554 Even though the section isn't allocated yet, this is where we will be
1555 putting it. */
1556 bh = NULL;
1557 val = globals->arm_glue_size + 1;
1558 _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner,
1559 tmp_name, BSF_GLOBAL, s, val,
1560 NULL, TRUE, FALSE, &bh);
1561
1562 free (tmp_name);
1563
1564 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1565
1566 return;
1567}
1568
1569static void
1570record_thumb_to_arm_glue (struct bfd_link_info *link_info,
1571 struct elf_link_hash_entry *h)
1572{
1573 const char *name = h->root.root.string;
1574 asection *s;
1575 char *tmp_name;
1576 struct elf_link_hash_entry *myh;
1577 struct bfd_link_hash_entry *bh;
1578 struct elf32_arm_link_hash_table *hash_table;
1579 char bind;
1580 bfd_vma val;
1581
1582 hash_table = elf32_arm_hash_table (link_info);
1583
1584 BFD_ASSERT (hash_table != NULL);
1585 BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL);
1586
1587 s = bfd_get_section_by_name
1588 (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1589
1590 BFD_ASSERT (s != NULL);
1591
1592 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1593 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1594
1595 BFD_ASSERT (tmp_name);
1596
1597 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1598
1599 myh = elf_link_hash_lookup
1600 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1601
1602 if (myh != NULL)
1603 {
1604 /* We've already seen this guy. */
1605 free (tmp_name);
1606 return;
1607 }
1608
1609 bh = NULL;
1610 val = hash_table->thumb_glue_size + 1;
1611 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner,
1612 tmp_name, BSF_GLOBAL, s, val,
1613 NULL, TRUE, FALSE, &bh);
1614
1615 /* If we mark it 'Thumb', the disassembler will do a better job. */
1616 myh = (struct elf_link_hash_entry *) bh;
1617 bind = ELF_ST_BIND (myh->type);
1618 myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC);
1619
1620 free (tmp_name);
1621
1622#define CHANGE_TO_ARM "__%s_change_to_arm"
1623#define BACK_FROM_ARM "__%s_back_from_arm"
1624
1625 /* Allocate another symbol to mark where we switch to Arm mode. */
1626 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1627 + strlen (CHANGE_TO_ARM) + 1);
1628
1629 BFD_ASSERT (tmp_name);
1630
1631 sprintf (tmp_name, CHANGE_TO_ARM, name);
1632
1633 bh = NULL;
1634 val = hash_table->thumb_glue_size + 4,
1635 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner,
1636 tmp_name, BSF_LOCAL, s, val,
1637 NULL, TRUE, FALSE, &bh);
1638
1639 free (tmp_name);
1640
1641 hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1642
1643 return;
1644}
1645
1646/* Add the glue sections to ABFD. This function is called from the
1647 linker scripts in ld/emultempl/{armelf}.em. */
1648
1649bfd_boolean
1650bfd_elf32_arm_add_glue_sections_to_bfd (bfd *abfd,
1651 struct bfd_link_info *info)
1652{
1653 flagword flags;
1654 asection *sec;
1655
1656 /* If we are only performing a partial
1657 link do not bother adding the glue. */
1658 if (info->relocatable)
1659 return TRUE;
1660
1661 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1662
1663 if (sec == NULL)
1664 {
1665 /* Note: we do not include the flag SEC_LINKER_CREATED, as this
1666 will prevent elf_link_input_bfd() from processing the contents
1667 of this section. */
1668 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1669
1670 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1671
1672 if (sec == NULL
1673 || !bfd_set_section_flags (abfd, sec, flags)
1674 || !bfd_set_section_alignment (abfd, sec, 2))
1675 return FALSE;
1676
1677 /* Set the gc mark to prevent the section from being removed by garbage
1678 collection, despite the fact that no relocs refer to this section. */
1679 sec->gc_mark = 1;
1680 }
1681
1682 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1683
1684 if (sec == NULL)
1685 {
1686 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1687 | SEC_CODE | SEC_READONLY;
1688
1689 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1690
1691 if (sec == NULL
1692 || !bfd_set_section_flags (abfd, sec, flags)
1693 || !bfd_set_section_alignment (abfd, sec, 2))
1694 return FALSE;
1695
1696 sec->gc_mark = 1;
1697 }
1698
1699 return TRUE;
1700}
1701
1702/* Select a BFD to be used to hold the sections used by the glue code.
1703 This function is called from the linker scripts in ld/emultempl/
1704 {armelf/pe}.em */
1705
1706bfd_boolean
1707bfd_elf32_arm_get_bfd_for_interworking (bfd *abfd, struct bfd_link_info *info)
1708{
1709 struct elf32_arm_link_hash_table *globals;
1710
1711 /* If we are only performing a partial link
1712 do not bother getting a bfd to hold the glue. */
1713 if (info->relocatable)
1714 return TRUE;
1715
1716 globals = elf32_arm_hash_table (info);
1717
1718 BFD_ASSERT (globals != NULL);
1719
1720 if (globals->bfd_of_glue_owner != NULL)
1721 return TRUE;
1722
1723 /* Save the bfd for later use. */
1724 globals->bfd_of_glue_owner = abfd;
1725
1726 return TRUE;
1727}
1728
1729bfd_boolean
1730bfd_elf32_arm_process_before_allocation (bfd *abfd,
1731 struct bfd_link_info *link_info,
1732 int no_pipeline_knowledge,
1733 int byteswap_code)
1734{
1735 Elf_Internal_Shdr *symtab_hdr;
1736 Elf_Internal_Rela *internal_relocs = NULL;
1737 Elf_Internal_Rela *irel, *irelend;
1738 bfd_byte *contents = NULL;
1739
1740 asection *sec;
1741 struct elf32_arm_link_hash_table *globals;
1742
1743 /* If we are only performing a partial link do not bother
1744 to construct any glue. */
1745 if (link_info->relocatable)
1746 return TRUE;
1747
1748 /* Here we have a bfd that is to be included on the link. We have a hook
1749 to do reloc rummaging, before section sizes are nailed down. */
1750 globals = elf32_arm_hash_table (link_info);
1751
1752 BFD_ASSERT (globals != NULL);
1753 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1754
1755 globals->no_pipeline_knowledge = no_pipeline_knowledge;
1756
1757 if (byteswap_code && !bfd_big_endian (abfd))
1758 {
1759 _bfd_error_handler (_("%B: BE8 images only valid in big-endian mode."),
1760 abfd);
1761 return FALSE;
1762 }
1763 globals->byteswap_code = byteswap_code;
1764
1765 /* Rummage around all the relocs and map the glue vectors. */
1766 sec = abfd->sections;
1767
1768 if (sec == NULL)
1769 return TRUE;
1770
1771 for (; sec != NULL; sec = sec->next)
1772 {
1773 if (sec->reloc_count == 0)
1774 continue;
1775
1776 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1777
1778 /* Load the relocs. */
1779 internal_relocs
1780 = _bfd_elf_link_read_relocs (abfd, sec, (void *) NULL,
1781 (Elf_Internal_Rela *) NULL, FALSE);
1782
1783 if (internal_relocs == NULL)
1784 goto error_return;
1785
1786 irelend = internal_relocs + sec->reloc_count;
1787 for (irel = internal_relocs; irel < irelend; irel++)
1788 {
1789 long r_type;
1790 unsigned long r_index;
1791
1792 struct elf_link_hash_entry *h;
1793
1794 r_type = ELF32_R_TYPE (irel->r_info);
1795 r_index = ELF32_R_SYM (irel->r_info);
1796
1797 /* These are the only relocation types we care about. */
1798 if ( r_type != R_ARM_PC24
1799#ifndef OLD_ARM_ABI
1800 && r_type != R_ARM_CALL
1801 && r_type != R_ARM_JUMP24
1802#endif
1803 && r_type != R_ARM_THM_PC22)
1804 continue;
1805
1806 /* Get the section contents if we haven't done so already. */
1807 if (contents == NULL)
1808 {
1809 /* Get cached copy if it exists. */
1810 if (elf_section_data (sec)->this_hdr.contents != NULL)
1811 contents = elf_section_data (sec)->this_hdr.contents;
1812 else
1813 {
1814 /* Go get them off disk. */
1815 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
1816 goto error_return;
1817 }
1818 }
1819
1820 /* If the relocation is not against a symbol it cannot concern us. */
1821 h = NULL;
1822
1823 /* We don't care about local symbols. */
1824 if (r_index < symtab_hdr->sh_info)
1825 continue;
1826
1827 /* This is an external symbol. */
1828 r_index -= symtab_hdr->sh_info;
1829 h = (struct elf_link_hash_entry *)
1830 elf_sym_hashes (abfd)[r_index];
1831
1832 /* If the relocation is against a static symbol it must be within
1833 the current section and so cannot be a cross ARM/Thumb relocation. */
1834 if (h == NULL)
1835 continue;
1836
1837 switch (r_type)
1838 {
1839 case R_ARM_PC24:
1840#ifndef OLD_ARM_ABI
1841 case R_ARM_CALL:
1842 case R_ARM_JUMP24:
1843#endif
1844 /* This one is a call from arm code. We need to look up
1845 the target of the call. If it is a thumb target, we
1846 insert glue. */
1847 if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC)
1848 record_arm_to_thumb_glue (link_info, h);
1849 break;
1850
1851 case R_ARM_THM_PC22:
1852 /* This one is a call from thumb code. We look
1853 up the target of the call. If it is not a thumb
1854 target, we insert glue. */
1855 if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC)
1856 record_thumb_to_arm_glue (link_info, h);
1857 break;
1858
1859 default:
1860 break;
1861 }
1862 }
1863
1864 if (contents != NULL
1865 && elf_section_data (sec)->this_hdr.contents != contents)
1866 free (contents);
1867 contents = NULL;
1868
1869 if (internal_relocs != NULL
1870 && elf_section_data (sec)->relocs != internal_relocs)
1871 free (internal_relocs);
1872 internal_relocs = NULL;
1873 }
1874
1875 return TRUE;
1876
1877error_return:
1878 if (contents != NULL
1879 && elf_section_data (sec)->this_hdr.contents != contents)
1880 free (contents);
1881 if (internal_relocs != NULL
1882 && elf_section_data (sec)->relocs != internal_relocs)
1883 free (internal_relocs);
1884
1885 return FALSE;
1886}
1887#endif
1888
1889
1890#ifndef OLD_ARM_ABI
1891/* Set target relocation values needed during linking. */
1892
1893void
1894bfd_elf32_arm_set_target_relocs (struct bfd_link_info *link_info,
1895 int target1_is_rel,
1896 char * target2_type)
1897{
1898 struct elf32_arm_link_hash_table *globals;
1899
1900 globals = elf32_arm_hash_table (link_info);
1901
1902 globals->target1_is_rel = target1_is_rel;
1903 if (strcmp (target2_type, "rel") == 0)
1904 globals->target2_reloc = R_ARM_REL32;
1905 else if (strcmp (target2_type, "abs") == 0)
1906 globals->target2_reloc = R_ARM_ABS32;
1907 else if (strcmp (target2_type, "got-rel") == 0)
1908 globals->target2_reloc = R_ARM_GOT_PREL;
1909 else
1910 {
1911 _bfd_error_handler (_("Invalid TARGET2 relocation type '%s'."),
1912 target2_type);
1913 }
1914}
1915#endif
1916
1917/* The thumb form of a long branch is a bit finicky, because the offset
1918 encoding is split over two fields, each in it's own instruction. They
1919 can occur in any order. So given a thumb form of long branch, and an
1920 offset, insert the offset into the thumb branch and return finished
1921 instruction.
1922
1923 It takes two thumb instructions to encode the target address. Each has
1924 11 bits to invest. The upper 11 bits are stored in one (identified by
1925 H-0.. see below), the lower 11 bits are stored in the other (identified
1926 by H-1).
1927
1928 Combine together and shifted left by 1 (it's a half word address) and
1929 there you have it.
1930
1931 Op: 1111 = F,
1932 H-0, upper address-0 = 000
1933 Op: 1111 = F,
1934 H-1, lower address-0 = 800
1935
1936 They can be ordered either way, but the arm tools I've seen always put
1937 the lower one first. It probably doesn't matter. krk@cygnus.com
1938
1939 XXX: Actually the order does matter. The second instruction (H-1)
1940 moves the computed address into the PC, so it must be the second one
1941 in the sequence. The problem, however is that whilst little endian code
1942 stores the instructions in HI then LOW order, big endian code does the
1943 reverse. nickc@cygnus.com. */
1944
1945#define LOW_HI_ORDER 0xF800F000
1946#define HI_LOW_ORDER 0xF000F800
1947
1948static insn32
1949insert_thumb_branch (insn32 br_insn, int rel_off)
1950{
1951 unsigned int low_bits;
1952 unsigned int high_bits;
1953
1954 BFD_ASSERT ((rel_off & 1) != 1);
1955
1956 rel_off >>= 1; /* Half word aligned address. */
1957 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
1958 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
1959
1960 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1961 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1962 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1963 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1964 else
1965 /* FIXME: abort is probably not the right call. krk@cygnus.com */
1966 abort (); /* Error - not a valid branch instruction form. */
1967
1968 return br_insn;
1969}
1970
1971/* Thumb code calling an ARM function. */
1972
1973static int
1974elf32_thumb_to_arm_stub (struct bfd_link_info * info,
1975 const char * name,
1976 bfd * input_bfd,
1977 bfd * output_bfd,
1978 asection * input_section,
1979 bfd_byte * hit_data,
1980 asection * sym_sec,
1981 bfd_vma offset,
1982 bfd_signed_vma addend,
1983 bfd_vma val)
1984{
1985 asection * s = 0;
1986 bfd_vma my_offset;
1987 unsigned long int tmp;
1988 long int ret_offset;
1989 struct elf_link_hash_entry * myh;
1990 struct elf32_arm_link_hash_table * globals;
1991
1992 myh = find_thumb_glue (info, name, input_bfd);
1993 if (myh == NULL)
1994 return FALSE;
1995
1996 globals = elf32_arm_hash_table (info);
1997
1998 BFD_ASSERT (globals != NULL);
1999 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2000
2001 my_offset = myh->root.u.def.value;
2002
2003 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
2004 THUMB2ARM_GLUE_SECTION_NAME);
2005
2006 BFD_ASSERT (s != NULL);
2007 BFD_ASSERT (s->contents != NULL);
2008 BFD_ASSERT (s->output_section != NULL);
2009
2010 if ((my_offset & 0x01) == 0x01)
2011 {
2012 if (sym_sec != NULL
2013 && sym_sec->owner != NULL
2014 && !INTERWORK_FLAG (sym_sec->owner))
2015 {
2016 (*_bfd_error_handler)
2017 (_("%B(%s): warning: interworking not enabled.\n"
2018 " first occurrence: %B: thumb call to arm"),
2019 sym_sec->owner, input_bfd, name);
2020
2021 return FALSE;
2022 }
2023
2024 --my_offset;
2025 myh->root.u.def.value = my_offset;
2026
2027 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
2028 s->contents + my_offset);
2029
2030 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
2031 s->contents + my_offset + 2);
2032
2033 ret_offset =
2034 /* Address of destination of the stub. */
2035 ((bfd_signed_vma) val)
2036 - ((bfd_signed_vma)
2037 /* Offset from the start of the current section
2038 to the start of the stubs. */
2039 (s->output_offset
2040 /* Offset of the start of this stub from the start of the stubs. */
2041 + my_offset
2042 /* Address of the start of the current section. */
2043 + s->output_section->vma)
2044 /* The branch instruction is 4 bytes into the stub. */
2045 + 4
2046 /* ARM branches work from the pc of the instruction + 8. */
2047 + 8);
2048
2049 bfd_put_32 (output_bfd,
2050 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
2051 s->contents + my_offset + 4);
2052 }
2053
2054 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
2055
2056 /* Now go back and fix up the original BL insn to point to here. */
2057 ret_offset =
2058 /* Address of where the stub is located. */
2059 (s->output_section->vma + s->output_offset + my_offset)
2060 /* Address of where the BL is located. */
2061 - (input_section->output_section->vma + input_section->output_offset
2062 + offset)
2063 /* Addend in the relocation. */
2064 - addend
2065 /* Biassing for PC-relative addressing. */
2066 - 8;
2067
2068 tmp = bfd_get_32 (input_bfd, hit_data
2069 - input_section->vma);
2070
2071 bfd_put_32 (output_bfd,
2072 (bfd_vma) insert_thumb_branch (tmp, ret_offset),
2073 hit_data - input_section->vma);
2074
2075 return TRUE;
2076}
2077
2078/* Arm code calling a Thumb function. */
2079
2080static int
2081elf32_arm_to_thumb_stub (struct bfd_link_info * info,
2082 const char * name,
2083 bfd * input_bfd,
2084 bfd * output_bfd,
2085 asection * input_section,
2086 bfd_byte * hit_data,
2087 asection * sym_sec,
2088 bfd_vma offset,
2089 bfd_signed_vma addend,
2090 bfd_vma val)
2091{
2092 unsigned long int tmp;
2093 bfd_vma my_offset;
2094 asection * s;
2095 long int ret_offset;
2096 struct elf_link_hash_entry * myh;
2097 struct elf32_arm_link_hash_table * globals;
2098
2099 myh = find_arm_glue (info, name, input_bfd);
2100 if (myh == NULL)
2101 return FALSE;
2102
2103 globals = elf32_arm_hash_table (info);
2104
2105 BFD_ASSERT (globals != NULL);
2106 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2107
2108 my_offset = myh->root.u.def.value;
2109 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
2110 ARM2THUMB_GLUE_SECTION_NAME);
2111 BFD_ASSERT (s != NULL);
2112 BFD_ASSERT (s->contents != NULL);
2113 BFD_ASSERT (s->output_section != NULL);
2114
2115 if ((my_offset & 0x01) == 0x01)
2116 {
2117 if (sym_sec != NULL
2118 && sym_sec->owner != NULL
2119 && !INTERWORK_FLAG (sym_sec->owner))
2120 {
2121 (*_bfd_error_handler)
2122 (_("%B(%s): warning: interworking not enabled.\n"
2123 " first occurrence: %B: arm call to thumb"),
2124 sym_sec->owner, input_bfd, name);
2125 }
2126
2127 --my_offset;
2128 myh->root.u.def.value = my_offset;
2129
2130 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
2131 s->contents + my_offset);
2132
2133 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
2134 s->contents + my_offset + 4);
2135
2136 /* It's a thumb address. Add the low order bit. */
2137 bfd_put_32 (output_bfd, val | a2t3_func_addr_insn,
2138 s->contents + my_offset + 8);
2139 }
2140
2141 BFD_ASSERT (my_offset <= globals->arm_glue_size);
2142
2143 tmp = bfd_get_32 (input_bfd, hit_data);
2144 tmp = tmp & 0xFF000000;
2145
2146 /* Somehow these are both 4 too far, so subtract 8. */
2147 ret_offset = (s->output_offset
2148 + my_offset
2149 + s->output_section->vma
2150 - (input_section->output_offset
2151 + input_section->output_section->vma
2152 + offset + addend)
2153 - 8);
2154
2155 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
2156
2157 bfd_put_32 (output_bfd, (bfd_vma) tmp, hit_data - input_section->vma);
2158
2159 return TRUE;
2160}
2161
2162
2163#ifndef OLD_ARM_ABI
2164/* Some relocations map to different relocations depending on the
2165 target. Return the real relocation. */
2166static int
2167arm_real_reloc_type (struct elf32_arm_link_hash_table * globals,
2168 int r_type)
2169{
2170 switch (r_type)
2171 {
2172 case R_ARM_TARGET1:
2173 if (globals->target1_is_rel)
2174 return R_ARM_REL32;
2175 else
2176 return R_ARM_ABS32;
2177
2178 case R_ARM_TARGET2:
2179 return globals->target2_reloc;
2180
2181 default:
2182 return r_type;
2183 }
2184}
2185#endif /* OLD_ARM_ABI */
2186
2187
2188/* Perform a relocation as part of a final link. */
2189
2190static bfd_reloc_status_type
2191elf32_arm_final_link_relocate (reloc_howto_type * howto,
2192 bfd * input_bfd,
2193 bfd * output_bfd,
2194 asection * input_section,
2195 bfd_byte * contents,
2196 Elf_Internal_Rela * rel,
2197 bfd_vma value,
2198 struct bfd_link_info * info,
2199 asection * sym_sec,
2200 const char * sym_name,
2201 int sym_flags,
2202 struct elf_link_hash_entry * h)
2203{
2204 unsigned long r_type = howto->type;
2205 unsigned long r_symndx;
2206 bfd_byte * hit_data = contents + rel->r_offset;
2207 bfd * dynobj = NULL;
2208 Elf_Internal_Shdr * symtab_hdr;
2209 struct elf_link_hash_entry ** sym_hashes;
2210 bfd_vma * local_got_offsets;
2211 asection * sgot = NULL;
2212 asection * splt = NULL;
2213 asection * sreloc = NULL;
2214 bfd_vma addend;
2215 bfd_signed_vma signed_addend;
2216 struct elf32_arm_link_hash_table * globals;
2217
2218 globals = elf32_arm_hash_table (info);
2219
2220#ifndef OLD_ARM_ABI
2221 /* Some relocation type map to different relocations depending on the
2222 target. We pick the right one here. */
2223 r_type = arm_real_reloc_type (globals, r_type);
2224 if (r_type != howto->type)
2225 howto = elf32_arm_howto_from_type (r_type);
2226#endif /* OLD_ARM_ABI */
2227
2228 /* If the start address has been set, then set the EF_ARM_HASENTRY
2229 flag. Setting this more than once is redundant, but the cost is
2230 not too high, and it keeps the code simple.
2231
2232 The test is done here, rather than somewhere else, because the
2233 start address is only set just before the final link commences.
2234
2235 Note - if the user deliberately sets a start address of 0, the
2236 flag will not be set. */
2237 if (bfd_get_start_address (output_bfd) != 0)
2238 elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY;
2239
2240 dynobj = elf_hash_table (info)->dynobj;
2241 if (dynobj)
2242 {
2243 sgot = bfd_get_section_by_name (dynobj, ".got");
2244 splt = bfd_get_section_by_name (dynobj, ".plt");
2245 }
2246 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
2247 sym_hashes = elf_sym_hashes (input_bfd);
2248 local_got_offsets = elf_local_got_offsets (input_bfd);
2249 r_symndx = ELF32_R_SYM (rel->r_info);
2250
2251#if USE_REL
2252 addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask;
2253
2254 if (addend & ((howto->src_mask + 1) >> 1))
2255 {
2256 signed_addend = -1;
2257 signed_addend &= ~ howto->src_mask;
2258 signed_addend |= addend;
2259 }
2260 else
2261 signed_addend = addend;
2262#else
2263 addend = signed_addend = rel->r_addend;
2264#endif
2265
2266 switch (r_type)
2267 {
2268 case R_ARM_NONE:
2269 return bfd_reloc_ok;
2270
2271 case R_ARM_PC24:
2272 case R_ARM_ABS32:
2273 case R_ARM_REL32:
2274#ifndef OLD_ARM_ABI
2275 case R_ARM_CALL:
2276 case R_ARM_JUMP24:
2277 case R_ARM_XPC25:
2278 case R_ARM_PREL31:
2279#endif
2280 case R_ARM_PLT32:
2281 /* r_symndx will be zero only for relocs against symbols
2282 from removed linkonce sections, or sections discarded by
2283 a linker script. */
2284 if (r_symndx == 0)
2285 return bfd_reloc_ok;
2286
2287 /* Handle relocations which should use the PLT entry. ABS32/REL32
2288 will use the symbol's value, which may point to a PLT entry, but we
2289 don't need to handle that here. If we created a PLT entry, all
2290 branches in this object should go to it. */
2291 if ((r_type != R_ARM_ABS32 && r_type != R_ARM_REL32)
2292 && h != NULL
2293 && splt != NULL
2294 && h->plt.offset != (bfd_vma) -1)
2295 {
2296 /* If we've created a .plt section, and assigned a PLT entry to
2297 this function, it should not be known to bind locally. If
2298 it were, we would have cleared the PLT entry. */
2299 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h));
2300
2301 value = (splt->output_section->vma
2302 + splt->output_offset
2303 + h->plt.offset);
2304 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2305 contents, rel->r_offset, value,
2306 (bfd_vma) 0);
2307 }
2308
2309 /* When generating a shared object, these relocations are copied
2310 into the output file to be resolved at run time. */
2311 if (info->shared
2312 && (input_section->flags & SEC_ALLOC)
2313 && (r_type != R_ARM_REL32
2314 || !SYMBOL_CALLS_LOCAL (info, h))
2315 && (h == NULL
2316 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2317 || h->root.type != bfd_link_hash_undefweak)
2318 && r_type != R_ARM_PC24
2319#ifndef OLD_ARM_ABI
2320 && r_type != R_ARM_CALL
2321 && r_type != R_ARM_JUMP24
2322 && r_type != R_ARM_PREL31
2323#endif
2324 && r_type != R_ARM_PLT32)
2325 {
2326 Elf_Internal_Rela outrel;
2327 bfd_byte *loc;
2328 bfd_boolean skip, relocate;
2329
2330 if (sreloc == NULL)
2331 {
2332 const char * name;
2333
2334 name = (bfd_elf_string_from_elf_section
2335 (input_bfd,
2336 elf_elfheader (input_bfd)->e_shstrndx,
2337 elf_section_data (input_section)->rel_hdr.sh_name));
2338 if (name == NULL)
2339 return bfd_reloc_notsupported;
2340
2341 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
2342 && strcmp (bfd_get_section_name (input_bfd,
2343 input_section),
2344 name + 4) == 0);
2345
2346 sreloc = bfd_get_section_by_name (dynobj, name);
2347 BFD_ASSERT (sreloc != NULL);
2348 }
2349
2350 skip = FALSE;
2351 relocate = FALSE;
2352
2353 outrel.r_offset =
2354 _bfd_elf_section_offset (output_bfd, info, input_section,
2355 rel->r_offset);
2356 if (outrel.r_offset == (bfd_vma) -1)
2357 skip = TRUE;
2358 else if (outrel.r_offset == (bfd_vma) -2)
2359 skip = TRUE, relocate = TRUE;
2360 outrel.r_offset += (input_section->output_section->vma
2361 + input_section->output_offset);
2362
2363 if (skip)
2364 memset (&outrel, 0, sizeof outrel);
2365 else if (h != NULL
2366 && h->dynindx != -1
2367 && (!info->shared
2368 || !info->symbolic
2369 || !h->def_regular))
2370 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2371 else
2372 {
2373 int symbol;
2374
2375 /* This symbol is local, or marked to become local. */
2376 relocate = TRUE;
2377 if (globals->symbian_p)
2378 {
2379 /* On Symbian OS, the data segment and text segement
2380 can be relocated independently. Therefore, we
2381 must indicate the segment to which this
2382 relocation is relative. The BPABI allows us to
2383 use any symbol in the right segment; we just use
2384 the section symbol as it is convenient. (We
2385 cannot use the symbol given by "h" directly as it
2386 will not appear in the dynamic symbol table.) */
2387 symbol = elf_section_data (sym_sec->output_section)->dynindx;
2388 BFD_ASSERT (symbol != 0);
2389 }
2390 else
2391 /* On SVR4-ish systems, the dynamic loader cannot
2392 relocate the text and data segments independently,
2393 so the symbol does not matter. */
2394 symbol = 0;
2395 outrel.r_info = ELF32_R_INFO (symbol, R_ARM_RELATIVE);
2396 }
2397
2398 loc = sreloc->contents;
2399 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2400 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2401
2402 /* If this reloc is against an external symbol, we do not want to
2403 fiddle with the addend. Otherwise, we need to include the symbol
2404 value so that it becomes an addend for the dynamic reloc. */
2405 if (! relocate)
2406 return bfd_reloc_ok;
2407
2408 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2409 contents, rel->r_offset, value,
2410 (bfd_vma) 0);
2411 }
2412 else switch (r_type)
2413 {
2414#ifndef OLD_ARM_ABI
2415 case R_ARM_XPC25: /* Arm BLX instruction. */
2416 case R_ARM_CALL:
2417 case R_ARM_JUMP24:
2418#endif
2419 case R_ARM_PC24: /* Arm B/BL instruction */
2420 case R_ARM_PLT32:
2421#ifndef OLD_ARM_ABI
2422 if (r_type == R_ARM_XPC25)
2423 {
2424 /* Check for Arm calling Arm function. */
2425 /* FIXME: Should we translate the instruction into a BL
2426 instruction instead ? */
2427 if (sym_flags != STT_ARM_TFUNC)
2428 (*_bfd_error_handler)
2429 (_("\%B: Warning: Arm BLX instruction targets Arm function '%s'."),
2430 input_bfd,
2431 h ? h->root.root.string : "(local)");
2432 }
2433 else
2434#endif
2435 {
2436 /* Check for Arm calling Thumb function. */
2437 if (sym_flags == STT_ARM_TFUNC)
2438 {
2439 elf32_arm_to_thumb_stub (info, sym_name, input_bfd,
2440 output_bfd, input_section,
2441 hit_data, sym_sec, rel->r_offset,
2442 signed_addend, value);
2443 return bfd_reloc_ok;
2444 }
2445 }
2446
2447 if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0
2448 || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0)
2449 {
2450 /* The old way of doing things. Trearing the addend as a
2451 byte sized field and adding in the pipeline offset. */
2452 value -= (input_section->output_section->vma
2453 + input_section->output_offset);
2454 value -= rel->r_offset;
2455 value += addend;
2456
2457 if (! globals->no_pipeline_knowledge)
2458 value -= 8;
2459 }
2460 else
2461 {
2462 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
2463 where:
2464 S is the address of the symbol in the relocation.
2465 P is address of the instruction being relocated.
2466 A is the addend (extracted from the instruction) in bytes.
2467
2468 S is held in 'value'.
2469 P is the base address of the section containing the
2470 instruction plus the offset of the reloc into that
2471 section, ie:
2472 (input_section->output_section->vma +
2473 input_section->output_offset +
2474 rel->r_offset).
2475 A is the addend, converted into bytes, ie:
2476 (signed_addend * 4)
2477
2478 Note: None of these operations have knowledge of the pipeline
2479 size of the processor, thus it is up to the assembler to
2480 encode this information into the addend. */
2481 value -= (input_section->output_section->vma
2482 + input_section->output_offset);
2483 value -= rel->r_offset;
2484 value += (signed_addend << howto->size);
2485
2486 /* Previous versions of this code also used to add in the
2487 pipeline offset here. This is wrong because the linker is
2488 not supposed to know about such things, and one day it might
2489 change. In order to support old binaries that need the old
2490 behaviour however, so we attempt to detect which ABI was
2491 used to create the reloc. */
2492 if (! globals->no_pipeline_knowledge)
2493 {
2494 Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */
2495
2496 i_ehdrp = elf_elfheader (input_bfd);
2497
2498 if (i_ehdrp->e_ident[EI_OSABI] == 0)
2499 value -= 8;
2500 }
2501 }
2502
2503 signed_addend = value;
2504 signed_addend >>= howto->rightshift;
2505
2506 /* It is not an error for an undefined weak reference to be
2507 out of range. Any program that branches to such a symbol
2508 is going to crash anyway, so there is no point worrying
2509 about getting the destination exactly right. */
2510 if (! h || h->root.type != bfd_link_hash_undefweak)
2511 {
2512 /* Perform a signed range check. */
2513 if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1))
2514 || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1)))
2515 return bfd_reloc_overflow;
2516 }
2517
2518#ifndef OLD_ARM_ABI
2519 /* If necessary set the H bit in the BLX instruction. */
2520 if (r_type == R_ARM_XPC25 && ((value & 2) == 2))
2521 value = (signed_addend & howto->dst_mask)
2522 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask))
2523 | (1 << 24);
2524 else
2525#endif
2526 value = (signed_addend & howto->dst_mask)
2527 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask));
2528 break;
2529
2530 case R_ARM_ABS32:
2531 value += addend;
2532 if (sym_flags == STT_ARM_TFUNC)
2533 value |= 1;
2534 break;
2535
2536 case R_ARM_REL32:
2537 value -= (input_section->output_section->vma
2538 + input_section->output_offset + rel->r_offset);
2539 value += addend;
2540 break;
2541
2542#ifndef OLD_ARM_ABI
2543 case R_ARM_PREL31:
2544 value -= (input_section->output_section->vma
2545 + input_section->output_offset + rel->r_offset);
2546 value += signed_addend;
2547 if (! h || h->root.type != bfd_link_hash_undefweak)
2548 {
2549 /* Check for overflow */
2550 if ((value ^ (value >> 1)) & (1 << 30))
2551 return bfd_reloc_overflow;
2552 }
2553 value &= 0x7fffffff;
2554 value |= (bfd_get_32 (input_bfd, hit_data) & 0x80000000);
2555 if (sym_flags == STT_ARM_TFUNC)
2556 value |= 1;
2557 break;
2558#endif
2559 }
2560
2561 bfd_put_32 (input_bfd, value, hit_data);
2562 return bfd_reloc_ok;
2563
2564 case R_ARM_ABS8:
2565 value += addend;
2566 if ((long) value > 0x7f || (long) value < -0x80)
2567 return bfd_reloc_overflow;
2568
2569 bfd_put_8 (input_bfd, value, hit_data);
2570 return bfd_reloc_ok;
2571
2572 case R_ARM_ABS16:
2573 value += addend;
2574
2575 if ((long) value > 0x7fff || (long) value < -0x8000)
2576 return bfd_reloc_overflow;
2577
2578 bfd_put_16 (input_bfd, value, hit_data);
2579 return bfd_reloc_ok;
2580
2581 case R_ARM_ABS12:
2582 /* Support ldr and str instruction for the arm */
2583 /* Also thumb b (unconditional branch). ??? Really? */
2584 value += addend;
2585
2586 if ((long) value > 0x7ff || (long) value < -0x800)
2587 return bfd_reloc_overflow;
2588
2589 value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000);
2590 bfd_put_32 (input_bfd, value, hit_data);
2591 return bfd_reloc_ok;
2592
2593 case R_ARM_THM_ABS5:
2594 /* Support ldr and str instructions for the thumb. */
2595#if USE_REL
2596 /* Need to refetch addend. */
2597 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2598 /* ??? Need to determine shift amount from operand size. */
2599 addend >>= howto->rightshift;
2600#endif
2601 value += addend;
2602
2603 /* ??? Isn't value unsigned? */
2604 if ((long) value > 0x1f || (long) value < -0x10)
2605 return bfd_reloc_overflow;
2606
2607 /* ??? Value needs to be properly shifted into place first. */
2608 value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f;
2609 bfd_put_16 (input_bfd, value, hit_data);
2610 return bfd_reloc_ok;
2611
2612#ifndef OLD_ARM_ABI
2613 case R_ARM_THM_XPC22:
2614#endif
2615 case R_ARM_THM_PC22:
2616 /* Thumb BL (branch long instruction). */
2617 {
2618 bfd_vma relocation;
2619 bfd_boolean overflow = FALSE;
2620 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data);
2621 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2);
2622 bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift;
2623 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2624 bfd_vma check;
2625 bfd_signed_vma signed_check;
2626
2627#if USE_REL
2628 /* Need to refetch the addend and squish the two 11 bit pieces
2629 together. */
2630 {
2631 bfd_vma upper = upper_insn & 0x7ff;
2632 bfd_vma lower = lower_insn & 0x7ff;
2633 upper = (upper ^ 0x400) - 0x400; /* Sign extend. */
2634 addend = (upper << 12) | (lower << 1);
2635 signed_addend = addend;
2636 }
2637#endif
2638#ifndef OLD_ARM_ABI
2639 if (r_type == R_ARM_THM_XPC22)
2640 {
2641 /* Check for Thumb to Thumb call. */
2642 /* FIXME: Should we translate the instruction into a BL
2643 instruction instead ? */
2644 if (sym_flags == STT_ARM_TFUNC)
2645 (*_bfd_error_handler)
2646 (_("%B: Warning: Thumb BLX instruction targets thumb function '%s'."),
2647 input_bfd,
2648 h ? h->root.root.string : "(local)");
2649 }
2650 else
2651#endif
2652 {
2653 /* If it is not a call to Thumb, assume call to Arm.
2654 If it is a call relative to a section name, then it is not a
2655 function call at all, but rather a long jump. */
2656 if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION)
2657 {
2658 if (elf32_thumb_to_arm_stub
2659 (info, sym_name, input_bfd, output_bfd, input_section,
2660 hit_data, sym_sec, rel->r_offset, signed_addend, value))
2661 return bfd_reloc_ok;
2662 else
2663 return bfd_reloc_dangerous;
2664 }
2665 }
2666
2667 relocation = value + signed_addend;
2668
2669 relocation -= (input_section->output_section->vma
2670 + input_section->output_offset
2671 + rel->r_offset);
2672
2673 if (! globals->no_pipeline_knowledge)
2674 {
2675 Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */
2676
2677 i_ehdrp = elf_elfheader (input_bfd);
2678
2679 /* Previous versions of this code also used to add in the pipline
2680 offset here. This is wrong because the linker is not supposed
2681 to know about such things, and one day it might change. In order
2682 to support old binaries that need the old behaviour however, so
2683 we attempt to detect which ABI was used to create the reloc. */
2684 if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0
2685 || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0
2686 || i_ehdrp->e_ident[EI_OSABI] == 0)
2687 relocation += 4;
2688 }
2689
2690 check = relocation >> howto->rightshift;
2691
2692 /* If this is a signed value, the rightshift just dropped
2693 leading 1 bits (assuming twos complement). */
2694 if ((bfd_signed_vma) relocation >= 0)
2695 signed_check = check;
2696 else
2697 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift);
2698
2699 /* Assumes two's complement. */
2700 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2701 overflow = TRUE;
2702
2703#ifndef OLD_ARM_ABI
2704 if (r_type == R_ARM_THM_XPC22
2705 && ((lower_insn & 0x1800) == 0x0800))
2706 /* For a BLX instruction, make sure that the relocation is rounded up
2707 to a word boundary. This follows the semantics of the instruction
2708 which specifies that bit 1 of the target address will come from bit
2709 1 of the base address. */
2710 relocation = (relocation + 2) & ~ 3;
2711#endif
2712 /* Put RELOCATION back into the insn. */
2713 upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff);
2714 lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff);
2715
2716 /* Put the relocated value back in the object file: */
2717 bfd_put_16 (input_bfd, upper_insn, hit_data);
2718 bfd_put_16 (input_bfd, lower_insn, hit_data + 2);
2719
2720 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok);
2721 }
2722 break;
2723
2724 case R_ARM_THM_PC11:
2725 /* Thumb B (branch) instruction). */
2726 {
2727 bfd_signed_vma relocation;
2728 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
2729 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2730 bfd_signed_vma signed_check;
2731
2732#if USE_REL
2733 /* Need to refetch addend. */
2734 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2735 if (addend & ((howto->src_mask + 1) >> 1))
2736 {
2737 signed_addend = -1;
2738 signed_addend &= ~ howto->src_mask;
2739 signed_addend |= addend;
2740 }
2741 else
2742 signed_addend = addend;
2743 /* The value in the insn has been right shifted. We need to
2744 undo this, so that we can perform the address calculation
2745 in terms of bytes. */
2746 signed_addend <<= howto->rightshift;
2747#endif
2748 relocation = value + signed_addend;
2749
2750 relocation -= (input_section->output_section->vma
2751 + input_section->output_offset
2752 + rel->r_offset);
2753
2754 relocation >>= howto->rightshift;
2755 signed_check = relocation;
2756 relocation &= howto->dst_mask;
2757 relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask));
2758
2759 bfd_put_16 (input_bfd, relocation, hit_data);
2760
2761 /* Assumes two's complement. */
2762 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2763 return bfd_reloc_overflow;
2764
2765 return bfd_reloc_ok;
2766 }
2767
2768#ifndef OLD_ARM_ABI
2769 case R_ARM_ALU_PCREL7_0:
2770 case R_ARM_ALU_PCREL15_8:
2771 case R_ARM_ALU_PCREL23_15:
2772 {
2773 bfd_vma insn;
2774 bfd_vma relocation;
2775
2776 insn = bfd_get_32 (input_bfd, hit_data);
2777#if USE_REL
2778 /* Extract the addend. */
2779 addend = (insn & 0xff) << ((insn & 0xf00) >> 7);
2780 signed_addend = addend;
2781#endif
2782 relocation = value + signed_addend;
2783
2784 relocation -= (input_section->output_section->vma
2785 + input_section->output_offset
2786 + rel->r_offset);
2787 insn = (insn & ~0xfff)
2788 | ((howto->bitpos << 7) & 0xf00)
2789 | ((relocation >> howto->bitpos) & 0xff);
2790 bfd_put_32 (input_bfd, value, hit_data);
2791 }
2792 return bfd_reloc_ok;
2793#endif
2794
2795 case R_ARM_GNU_VTINHERIT:
2796 case R_ARM_GNU_VTENTRY:
2797 return bfd_reloc_ok;
2798
2799 case R_ARM_COPY:
2800 return bfd_reloc_notsupported;
2801
2802 case R_ARM_GLOB_DAT:
2803 return bfd_reloc_notsupported;
2804
2805 case R_ARM_JUMP_SLOT:
2806 return bfd_reloc_notsupported;
2807
2808 case R_ARM_RELATIVE:
2809 return bfd_reloc_notsupported;
2810
2811 case R_ARM_GOTOFF:
2812 /* Relocation is relative to the start of the
2813 global offset table. */
2814
2815 BFD_ASSERT (sgot != NULL);
2816 if (sgot == NULL)
2817 return bfd_reloc_notsupported;
2818
2819 /* If we are addressing a Thumb function, we need to adjust the
2820 address by one, so that attempts to call the function pointer will
2821 correctly interpret it as Thumb code. */
2822 if (sym_flags == STT_ARM_TFUNC)
2823 value += 1;
2824
2825 /* Note that sgot->output_offset is not involved in this
2826 calculation. We always want the start of .got. If we
2827 define _GLOBAL_OFFSET_TABLE in a different way, as is
2828 permitted by the ABI, we might have to change this
2829 calculation. */
2830 value -= sgot->output_section->vma;
2831 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2832 contents, rel->r_offset, value,
2833 (bfd_vma) 0);
2834
2835 case R_ARM_GOTPC:
2836 /* Use global offset table as symbol value. */
2837 BFD_ASSERT (sgot != NULL);
2838
2839 if (sgot == NULL)
2840 return bfd_reloc_notsupported;
2841
2842 value = sgot->output_section->vma;
2843 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2844 contents, rel->r_offset, value,
2845 (bfd_vma) 0);
2846
2847 case R_ARM_GOT32:
2848#ifndef OLD_ARM_ABI
2849 case R_ARM_GOT_PREL:
2850#endif
2851 /* Relocation is to the entry for this symbol in the
2852 global offset table. */
2853 if (sgot == NULL)
2854 return bfd_reloc_notsupported;
2855
2856 if (h != NULL)
2857 {
2858 bfd_vma off;
2859 bfd_boolean dyn;
2860
2861 off = h->got.offset;
2862 BFD_ASSERT (off != (bfd_vma) -1);
2863 dyn = globals->root.dynamic_sections_created;
2864
2865 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2866 || (info->shared
2867 && SYMBOL_REFERENCES_LOCAL (info, h))
2868 || (ELF_ST_VISIBILITY (h->other)
2869 && h->root.type == bfd_link_hash_undefweak))
2870 {
2871 /* This is actually a static link, or it is a -Bsymbolic link
2872 and the symbol is defined locally. We must initialize this
2873 entry in the global offset table. Since the offset must
2874 always be a multiple of 4, we use the least significant bit
2875 to record whether we have initialized it already.
2876
2877 When doing a dynamic link, we create a .rel.got relocation
2878 entry to initialize the value. This is done in the
2879 finish_dynamic_symbol routine. */
2880 if ((off & 1) != 0)
2881 off &= ~1;
2882 else
2883 {
2884 /* If we are addressing a Thumb function, we need to
2885 adjust the address by one, so that attempts to
2886 call the function pointer will correctly
2887 interpret it as Thumb code. */
2888 if (sym_flags == STT_ARM_TFUNC)
2889 value |= 1;
2890
2891 bfd_put_32 (output_bfd, value, sgot->contents + off);
2892 h->got.offset |= 1;
2893 }
2894 }
2895
2896 value = sgot->output_offset + off;
2897 }
2898 else
2899 {
2900 bfd_vma off;
2901
2902 BFD_ASSERT (local_got_offsets != NULL &&
2903 local_got_offsets[r_symndx] != (bfd_vma) -1);
2904
2905 off = local_got_offsets[r_symndx];
2906
2907 /* The offset must always be a multiple of 4. We use the
2908 least significant bit to record whether we have already
2909 generated the necessary reloc. */
2910 if ((off & 1) != 0)
2911 off &= ~1;
2912 else
2913 {
2914 bfd_put_32 (output_bfd, value, sgot->contents + off);
2915
2916 if (info->shared)
2917 {
2918 asection * srelgot;
2919 Elf_Internal_Rela outrel;
2920 bfd_byte *loc;
2921
2922 srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
2923 BFD_ASSERT (srelgot != NULL);
2924
2925 outrel.r_offset = (sgot->output_section->vma
2926 + sgot->output_offset
2927 + off);
2928 outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
2929 loc = srelgot->contents;
2930 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2931 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2932 }
2933
2934 local_got_offsets[r_symndx] |= 1;
2935 }
2936
2937 value = sgot->output_offset + off;
2938 }
2939 if (r_type != R_ARM_GOT32)
2940 value += sgot->output_section->vma;
2941
2942 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2943 contents, rel->r_offset, value,
2944 (bfd_vma) 0);
2945
2946 case R_ARM_SBREL32:
2947 return bfd_reloc_notsupported;
2948
2949 case R_ARM_AMP_VCALL9:
2950 return bfd_reloc_notsupported;
2951
2952 case R_ARM_RSBREL32:
2953 return bfd_reloc_notsupported;
2954
2955 case R_ARM_THM_RPC22:
2956 return bfd_reloc_notsupported;
2957
2958 case R_ARM_RREL32:
2959 return bfd_reloc_notsupported;
2960
2961 case R_ARM_RABS32:
2962 return bfd_reloc_notsupported;
2963
2964 case R_ARM_RPC24:
2965 return bfd_reloc_notsupported;
2966
2967 case R_ARM_RBASE:
2968 return bfd_reloc_notsupported;
2969
2970 default:
2971 return bfd_reloc_notsupported;
2972 }
2973}
2974
2975#if USE_REL
2976/* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
2977static void
2978arm_add_to_rel (bfd * abfd,
2979 bfd_byte * address,
2980 reloc_howto_type * howto,
2981 bfd_signed_vma increment)
2982{
2983 bfd_signed_vma addend;
2984
2985 if (howto->type == R_ARM_THM_PC22)
2986 {
2987 int upper_insn, lower_insn;
2988 int upper, lower;
2989
2990 upper_insn = bfd_get_16 (abfd, address);
2991 lower_insn = bfd_get_16 (abfd, address + 2);
2992 upper = upper_insn & 0x7ff;
2993 lower = lower_insn & 0x7ff;
2994
2995 addend = (upper << 12) | (lower << 1);
2996 addend += increment;
2997 addend >>= 1;
2998
2999 upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff);
3000 lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff);
3001
3002 bfd_put_16 (abfd, (bfd_vma) upper_insn, address);
3003 bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2);
3004 }
3005 else
3006 {
3007 bfd_vma contents;
3008
3009 contents = bfd_get_32 (abfd, address);
3010
3011 /* Get the (signed) value from the instruction. */
3012 addend = contents & howto->src_mask;
3013 if (addend & ((howto->src_mask + 1) >> 1))
3014 {
3015 bfd_signed_vma mask;
3016
3017 mask = -1;
3018 mask &= ~ howto->src_mask;
3019 addend |= mask;
3020 }
3021
3022 /* Add in the increment, (which is a byte value). */
3023 switch (howto->type)
3024 {
3025 default:
3026 addend += increment;
3027 break;
3028
3029 case R_ARM_PC24:
3030#ifndef OLD_ARM_ABI
3031 case R_ARM_CALL:
3032 case R_ARM_JUMP24:
3033#endif
3034 addend <<= howto->size;
3035 addend += increment;
3036
3037 /* Should we check for overflow here ? */
3038
3039 /* Drop any undesired bits. */
3040 addend >>= howto->rightshift;
3041 break;
3042 }
3043
3044 contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask);
3045
3046 bfd_put_32 (abfd, contents, address);
3047 }
3048}
3049#endif /* USE_REL */
3050
3051/* Relocate an ARM ELF section. */
3052static bfd_boolean
3053elf32_arm_relocate_section (bfd * output_bfd,
3054 struct bfd_link_info * info,
3055 bfd * input_bfd,
3056 asection * input_section,
3057 bfd_byte * contents,
3058 Elf_Internal_Rela * relocs,
3059 Elf_Internal_Sym * local_syms,
3060 asection ** local_sections)
3061{
3062 Elf_Internal_Shdr *symtab_hdr;
3063 struct elf_link_hash_entry **sym_hashes;
3064 Elf_Internal_Rela *rel;
3065 Elf_Internal_Rela *relend;
3066 const char *name;
3067 struct elf32_arm_link_hash_table * globals;
3068
3069#if !USE_REL
3070 if (info->relocatable)
3071 return TRUE;
3072#endif
3073
3074 globals = elf32_arm_hash_table (info);
3075 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
3076 sym_hashes = elf_sym_hashes (input_bfd);
3077
3078 rel = relocs;
3079 relend = relocs + input_section->reloc_count;
3080 for (; rel < relend; rel++)
3081 {
3082 int r_type;
3083 reloc_howto_type * howto;
3084 unsigned long r_symndx;
3085 Elf_Internal_Sym * sym;
3086 asection * sec;
3087 struct elf_link_hash_entry * h;
3088 bfd_vma relocation;
3089 bfd_reloc_status_type r;
3090 arelent bfd_reloc;
3091
3092 r_symndx = ELF32_R_SYM (rel->r_info);
3093 r_type = ELF32_R_TYPE (rel->r_info);
3094 r_type = arm_real_reloc_type (globals, r_type);
3095
3096 if ( r_type == R_ARM_GNU_VTENTRY
3097 || r_type == R_ARM_GNU_VTINHERIT)
3098 continue;
3099
3100 bfd_reloc.howto = elf32_arm_howto_from_type (r_type);
3101 howto = bfd_reloc.howto;
3102
3103#if USE_REL
3104 if (info->relocatable)
3105 {
3106 /* This is a relocatable link. We don't have to change
3107 anything, unless the reloc is against a section symbol,
3108 in which case we have to adjust according to where the
3109 section symbol winds up in the output section. */
3110 if (r_symndx < symtab_hdr->sh_info)
3111 {
3112 sym = local_syms + r_symndx;
3113 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3114 {
3115 sec = local_sections[r_symndx];
3116 arm_add_to_rel (input_bfd, contents + rel->r_offset,
3117 howto,
3118 (bfd_signed_vma) (sec->output_offset
3119 + sym->st_value));
3120 }
3121 }
3122
3123 continue;
3124 }
3125#endif
3126
3127 /* This is a final link. */
3128 h = NULL;
3129 sym = NULL;
3130 sec = NULL;
3131
3132 if (r_symndx < symtab_hdr->sh_info)
3133 {
3134 sym = local_syms + r_symndx;
3135 sec = local_sections[r_symndx];
3136#if USE_REL
3137 relocation = (sec->output_section->vma
3138 + sec->output_offset
3139 + sym->st_value);
3140 if ((sec->flags & SEC_MERGE)
3141 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3142 {
3143 asection *msec;
3144 bfd_vma addend, value;
3145
3146 if (howto->rightshift)
3147 {
3148 (*_bfd_error_handler)
3149 (_("%B(%A+0x%lx): %s relocation against SEC_MERGE section"),
3150 input_bfd, input_section,
3151 (long) rel->r_offset, howto->name);
3152 return FALSE;
3153 }
3154
3155 value = bfd_get_32 (input_bfd, contents + rel->r_offset);
3156
3157 /* Get the (signed) value from the instruction. */
3158 addend = value & howto->src_mask;
3159 if (addend & ((howto->src_mask + 1) >> 1))
3160 {
3161 bfd_signed_vma mask;
3162
3163 mask = -1;
3164 mask &= ~ howto->src_mask;
3165 addend |= mask;
3166 }
3167 msec = sec;
3168 addend =
3169 _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend)
3170 - relocation;
3171 addend += msec->output_section->vma + msec->output_offset;
3172 value = (value & ~ howto->dst_mask) | (addend & howto->dst_mask);
3173 bfd_put_32 (input_bfd, value, contents + rel->r_offset);
3174 }
3175#else
3176 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3177#endif
3178 }
3179 else
3180 {
3181 bfd_boolean warned;
3182 bfd_boolean unresolved_reloc;
3183
3184 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3185 r_symndx, symtab_hdr, sym_hashes,
3186 h, sec, relocation,
3187 unresolved_reloc, warned);
3188
3189 if (unresolved_reloc || relocation != 0)
3190 {
3191 /* In these cases, we don't need the relocation value.
3192 We check specially because in some obscure cases
3193 sec->output_section will be NULL. */
3194 switch (r_type)
3195 {
3196 case R_ARM_PC24:
3197#ifndef OLD_ARM_ABI
3198 case R_ARM_CALL:
3199 case R_ARM_JUMP24:
3200 case R_ARM_PREL31:
3201#endif
3202 case R_ARM_ABS32:
3203 case R_ARM_THM_PC22:
3204 case R_ARM_PLT32:
3205
3206 if (info->shared
3207 && ((!info->symbolic && h->dynindx != -1)
3208 || !h->def_regular)
3209 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3210 && ((input_section->flags & SEC_ALLOC) != 0
3211 /* DWARF will emit R_ARM_ABS32 relocations in its
3212 sections against symbols defined externally
3213 in shared libraries. We can't do anything
3214 with them here. */
3215 || ((input_section->flags & SEC_DEBUGGING) != 0
3216 && h->def_dynamic))
3217 )
3218 relocation = 0;
3219 break;
3220
3221 case R_ARM_GOTPC:
3222 relocation = 0;
3223 break;
3224
3225 case R_ARM_GOT32:
3226#ifndef OLD_ARM_ABI
3227 case R_ARM_GOT_PREL:
3228#endif
3229 if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL
3230 (elf_hash_table (info)->dynamic_sections_created,
3231 info->shared, h))
3232 && (!info->shared
3233 || (!info->symbolic && h->dynindx != -1)
3234 || !h->def_regular))
3235 relocation = 0;
3236 break;
3237
3238 default:
3239 if (unresolved_reloc)
3240 _bfd_error_handler
3241 (_("%B(%A): warning: unresolvable relocation %d against symbol `%s'"),
3242 input_bfd, input_section,
3243 r_type,
3244 h->root.root.string);
3245 break;
3246 }
3247 }
3248 }
3249
3250 if (h != NULL)
3251 name = h->root.root.string;
3252 else
3253 {
3254 name = (bfd_elf_string_from_elf_section
3255 (input_bfd, symtab_hdr->sh_link, sym->st_name));
3256 if (name == NULL || *name == '\0')
3257 name = bfd_section_name (input_bfd, sec);
3258 }
3259
3260 r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
3261 input_section, contents, rel,
3262 relocation, info, sec, name,
3263 (h ? ELF_ST_TYPE (h->type) :
3264 ELF_ST_TYPE (sym->st_info)), h);
3265
3266 if (r != bfd_reloc_ok)
3267 {
3268 const char * msg = (const char *) 0;
3269
3270 switch (r)
3271 {
3272 case bfd_reloc_overflow:
3273 /* If the overflowing reloc was to an undefined symbol,
3274 we have already printed one error message and there
3275 is no point complaining again. */
3276 if ((! h ||
3277 h->root.type != bfd_link_hash_undefined)
3278 && (!((*info->callbacks->reloc_overflow)
3279 (info, (h ? &h->root : NULL), name, howto->name,
3280 (bfd_vma) 0, input_bfd, input_section,
3281 rel->r_offset))))
3282 return FALSE;
3283 break;
3284
3285 case bfd_reloc_undefined:
3286 if (!((*info->callbacks->undefined_symbol)
3287 (info, name, input_bfd, input_section,
3288 rel->r_offset, TRUE)))
3289 return FALSE;
3290 break;
3291
3292 case bfd_reloc_outofrange:
3293 msg = _("internal error: out of range error");
3294 goto common_error;
3295
3296 case bfd_reloc_notsupported:
3297 msg = _("internal error: unsupported relocation error");
3298 goto common_error;
3299
3300 case bfd_reloc_dangerous:
3301 msg = _("internal error: dangerous error");
3302 goto common_error;
3303
3304 default:
3305 msg = _("internal error: unknown error");
3306 /* fall through */
3307
3308 common_error:
3309 if (!((*info->callbacks->warning)
3310 (info, msg, name, input_bfd, input_section,
3311 rel->r_offset)))
3312 return FALSE;
3313 break;
3314 }
3315 }
3316 }
3317
3318 return TRUE;
3319}
3320
3321/* Set the right machine number. */
3322
3323static bfd_boolean
3324elf32_arm_object_p (bfd *abfd)
3325{
3326 unsigned int mach;
3327
3328 mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION);
3329
3330 if (mach != bfd_mach_arm_unknown)
3331 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3332
3333 else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT)
3334 bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312);
3335
3336 else
3337 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3338
3339 return TRUE;
3340}
3341
3342/* Function to keep ARM specific flags in the ELF header. */
3343
3344static bfd_boolean
3345elf32_arm_set_private_flags (bfd *abfd, flagword flags)
3346{
3347 if (elf_flags_init (abfd)
3348 && elf_elfheader (abfd)->e_flags != flags)
3349 {
3350 if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN)
3351 {
3352 if (flags & EF_ARM_INTERWORK)
3353 (*_bfd_error_handler)
3354 (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
3355 abfd);
3356 else
3357 _bfd_error_handler
3358 (_("Warning: Clearing the interworking flag of %B due to outside request"),
3359 abfd);
3360 }
3361 }
3362 else
3363 {
3364 elf_elfheader (abfd)->e_flags = flags;
3365 elf_flags_init (abfd) = TRUE;
3366 }
3367
3368 return TRUE;
3369}
3370
3371/* Copy backend specific data from one object module to another. */
3372
3373static bfd_boolean
3374elf32_arm_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
3375{
3376 flagword in_flags;
3377 flagword out_flags;
3378
3379 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3380 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3381 return TRUE;
3382
3383 in_flags = elf_elfheader (ibfd)->e_flags;
3384 out_flags = elf_elfheader (obfd)->e_flags;
3385
3386 if (elf_flags_init (obfd)
3387 && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN
3388 && in_flags != out_flags)
3389 {
3390 /* Cannot mix APCS26 and APCS32 code. */
3391 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3392 return FALSE;
3393
3394 /* Cannot mix float APCS and non-float APCS code. */
3395 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3396 return FALSE;
3397
3398 /* If the src and dest have different interworking flags
3399 then turn off the interworking bit. */
3400 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3401 {
3402 if (out_flags & EF_ARM_INTERWORK)
3403 _bfd_error_handler
3404 (_("Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
3405 obfd, ibfd);
3406
3407 in_flags &= ~EF_ARM_INTERWORK;
3408 }
3409
3410 /* Likewise for PIC, though don't warn for this case. */
3411 if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC))
3412 in_flags &= ~EF_ARM_PIC;
3413 }
3414
3415 elf_elfheader (obfd)->e_flags = in_flags;
3416 elf_flags_init (obfd) = TRUE;
3417
3418 return TRUE;
3419}
3420
3421/* Merge backend specific data from an object file to the output
3422 object file when linking. */
3423
3424static bfd_boolean
3425elf32_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
3426{
3427 flagword out_flags;
3428 flagword in_flags;
3429 bfd_boolean flags_compatible = TRUE;
3430 asection *sec;
3431
3432 /* Check if we have the same endianess. */
3433 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
3434 return FALSE;
3435
3436 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3437 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3438 return TRUE;
3439
3440 /* The input BFD must have had its flags initialised. */
3441 /* The following seems bogus to me -- The flags are initialized in
3442 the assembler but I don't think an elf_flags_init field is
3443 written into the object. */
3444 /* BFD_ASSERT (elf_flags_init (ibfd)); */
3445
3446 in_flags = elf_elfheader (ibfd)->e_flags;
3447 out_flags = elf_elfheader (obfd)->e_flags;
3448
3449 if (!elf_flags_init (obfd))
3450 {
3451 /* If the input is the default architecture and had the default
3452 flags then do not bother setting the flags for the output
3453 architecture, instead allow future merges to do this. If no
3454 future merges ever set these flags then they will retain their
3455 uninitialised values, which surprise surprise, correspond
3456 to the default values. */
3457 if (bfd_get_arch_info (ibfd)->the_default
3458 && elf_elfheader (ibfd)->e_flags == 0)
3459 return TRUE;
3460
3461 elf_flags_init (obfd) = TRUE;
3462 elf_elfheader (obfd)->e_flags = in_flags;
3463
3464 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
3465 && bfd_get_arch_info (obfd)->the_default)
3466 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
3467
3468 return TRUE;
3469 }
3470
3471 /* Determine what should happen if the input ARM architecture
3472 does not match the output ARM architecture. */
3473 if (! bfd_arm_merge_machines (ibfd, obfd))
3474 return FALSE;
3475
3476 /* Identical flags must be compatible. */
3477 if (in_flags == out_flags)
3478 return TRUE;
3479
3480 /* Check to see if the input BFD actually contains any sections. If
3481 not, its flags may not have been initialised either, but it
3482 cannot actually cause any incompatibility. Do not short-circuit
3483 dynamic objects; their section list may be emptied by
3484 elf_link_add_object_symbols.
3485
3486 Also check to see if there are no code sections in the input.
3487 In this case there is no need to check for code specific flags.
3488 XXX - do we need to worry about floating-point format compatability
3489 in data sections ? */
3490 if (!(ibfd->flags & DYNAMIC))
3491 {
3492 bfd_boolean null_input_bfd = TRUE;
3493 bfd_boolean only_data_sections = TRUE;
3494
3495 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
3496 {
3497 /* Ignore synthetic glue sections. */
3498 if (strcmp (sec->name, ".glue_7")
3499 && strcmp (sec->name, ".glue_7t"))
3500 {
3501 if ((bfd_get_section_flags (ibfd, sec)
3502 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3503 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3504 only_data_sections = FALSE;
3505
3506 null_input_bfd = FALSE;
3507 break;
3508 }
3509 }
3510
3511 if (null_input_bfd || only_data_sections)
3512 return TRUE;
3513 }
3514
3515 /* Complain about various flag mismatches. */
3516 if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags))
3517 {
3518 _bfd_error_handler
3519 (_("ERROR: Source object %B has EABI version %d, but target %B has EABI version %d"),
3520 ibfd, obfd,
3521 (in_flags & EF_ARM_EABIMASK) >> 24,
3522 (out_flags & EF_ARM_EABIMASK) >> 24);
3523 return FALSE;
3524 }
3525
3526 /* Not sure what needs to be checked for EABI versions >= 1. */
3527 if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN)
3528 {
3529 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3530 {
3531 _bfd_error_handler
3532 (_("ERROR: %B is compiled for APCS-%d, whereas target %B uses APCS-%d"),
3533 ibfd, obfd,
3534 in_flags & EF_ARM_APCS_26 ? 26 : 32,
3535 out_flags & EF_ARM_APCS_26 ? 26 : 32);
3536 flags_compatible = FALSE;
3537 }
3538
3539 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3540 {
3541 if (in_flags & EF_ARM_APCS_FLOAT)
3542 _bfd_error_handler
3543 (_("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers"),
3544 ibfd, obfd);
3545 else
3546 _bfd_error_handler
3547 (_("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers"),
3548 ibfd, obfd);
3549
3550 flags_compatible = FALSE;
3551 }
3552
3553 if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT))
3554 {
3555 if (in_flags & EF_ARM_VFP_FLOAT)
3556 _bfd_error_handler
3557 (_("ERROR: %B uses VFP instructions, whereas %B does not"),
3558 ibfd, obfd);
3559 else
3560 _bfd_error_handler
3561 (_("ERROR: %B uses FPA instructions, whereas %B does not"),
3562 ibfd, obfd);
3563
3564 flags_compatible = FALSE;
3565 }
3566
3567 if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT))
3568 {
3569 if (in_flags & EF_ARM_MAVERICK_FLOAT)
3570 _bfd_error_handler
3571 (_("ERROR: %B uses Maverick instructions, whereas %B does not"),
3572 ibfd, obfd);
3573 else
3574 _bfd_error_handler
3575 (_("ERROR: %B does not use Maverick instructions, whereas %B does"),
3576 ibfd, obfd);
3577
3578 flags_compatible = FALSE;
3579 }
3580
3581#ifdef EF_ARM_SOFT_FLOAT
3582 if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT))
3583 {
3584 /* We can allow interworking between code that is VFP format
3585 layout, and uses either soft float or integer regs for
3586 passing floating point arguments and results. We already
3587 know that the APCS_FLOAT flags match; similarly for VFP
3588 flags. */
3589 if ((in_flags & EF_ARM_APCS_FLOAT) != 0
3590 || (in_flags & EF_ARM_VFP_FLOAT) == 0)
3591 {
3592 if (in_flags & EF_ARM_SOFT_FLOAT)
3593 _bfd_error_handler
3594 (_("ERROR: %B uses software FP, whereas %B uses hardware FP"),
3595 ibfd, obfd);
3596 else
3597 _bfd_error_handler
3598 (_("ERROR: %B uses hardware FP, whereas %B uses software FP"),
3599 ibfd, obfd);
3600
3601 flags_compatible = FALSE;
3602 }
3603 }
3604#endif
3605
3606 /* Interworking mismatch is only a warning. */
3607 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3608 {
3609 if (in_flags & EF_ARM_INTERWORK)
3610 {
3611 _bfd_error_handler
3612 (_("Warning: %B supports interworking, whereas %B does not"),
3613 ibfd, obfd);
3614 }
3615 else
3616 {
3617 _bfd_error_handler
3618 (_("Warning: %B does not support interworking, whereas %B does"),
3619 ibfd, obfd);
3620 }
3621 }
3622 }
3623
3624 return flags_compatible;
3625}
3626
3627/* Display the flags field. */
3628
3629static bfd_boolean
3630elf32_arm_print_private_bfd_data (bfd *abfd, void * ptr)
3631{
3632 FILE * file = (FILE *) ptr;
3633 unsigned long flags;
3634
3635 BFD_ASSERT (abfd != NULL && ptr != NULL);
3636
3637 /* Print normal ELF private data. */
3638 _bfd_elf_print_private_bfd_data (abfd, ptr);
3639
3640 flags = elf_elfheader (abfd)->e_flags;
3641 /* Ignore init flag - it may not be set, despite the flags field
3642 containing valid data. */
3643
3644 /* xgettext:c-format */
3645 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
3646
3647 switch (EF_ARM_EABI_VERSION (flags))
3648 {
3649 case EF_ARM_EABI_UNKNOWN:
3650 /* The following flag bits are GNU extensions and not part of the
3651 official ARM ELF extended ABI. Hence they are only decoded if
3652 the EABI version is not set. */
3653 if (flags & EF_ARM_INTERWORK)
3654 fprintf (file, _(" [interworking enabled]"));
3655
3656 if (flags & EF_ARM_APCS_26)
3657 fprintf (file, " [APCS-26]");
3658 else
3659 fprintf (file, " [APCS-32]");
3660
3661 if (flags & EF_ARM_VFP_FLOAT)
3662 fprintf (file, _(" [VFP float format]"));
3663 else if (flags & EF_ARM_MAVERICK_FLOAT)
3664 fprintf (file, _(" [Maverick float format]"));
3665 else
3666 fprintf (file, _(" [FPA float format]"));
3667
3668 if (flags & EF_ARM_APCS_FLOAT)
3669 fprintf (file, _(" [floats passed in float registers]"));
3670
3671 if (flags & EF_ARM_PIC)
3672 fprintf (file, _(" [position independent]"));
3673
3674 if (flags & EF_ARM_NEW_ABI)
3675 fprintf (file, _(" [new ABI]"));
3676
3677 if (flags & EF_ARM_OLD_ABI)
3678 fprintf (file, _(" [old ABI]"));
3679
3680 if (flags & EF_ARM_SOFT_FLOAT)
3681 fprintf (file, _(" [software FP]"));
3682
3683 flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT
3684 | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI
3685 | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT
3686 | EF_ARM_MAVERICK_FLOAT);
3687 break;
3688
3689 case EF_ARM_EABI_VER1:
3690 fprintf (file, _(" [Version1 EABI]"));
3691
3692 if (flags & EF_ARM_SYMSARESORTED)
3693 fprintf (file, _(" [sorted symbol table]"));
3694 else
3695 fprintf (file, _(" [unsorted symbol table]"));
3696
3697 flags &= ~ EF_ARM_SYMSARESORTED;
3698 break;
3699
3700 case EF_ARM_EABI_VER2:
3701 fprintf (file, _(" [Version2 EABI]"));
3702
3703 if (flags & EF_ARM_SYMSARESORTED)
3704 fprintf (file, _(" [sorted symbol table]"));
3705 else
3706 fprintf (file, _(" [unsorted symbol table]"));
3707
3708 if (flags & EF_ARM_DYNSYMSUSESEGIDX)
3709 fprintf (file, _(" [dynamic symbols use segment index]"));
3710
3711 if (flags & EF_ARM_MAPSYMSFIRST)
3712 fprintf (file, _(" [mapping symbols precede others]"));
3713
3714 flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX
3715 | EF_ARM_MAPSYMSFIRST);
3716 break;
3717
3718 case EF_ARM_EABI_VER3:
3719 fprintf (file, _(" [Version3 EABI]"));
3720 break;
3721
3722 case EF_ARM_EABI_VER4:
3723 fprintf (file, _(" [Version4 EABI]"));
3724
3725 if (flags & EF_ARM_BE8)
3726 fprintf (file, _(" [BE8]"));
3727
3728 if (flags & EF_ARM_LE8)
3729 fprintf (file, _(" [LE8]"));
3730
3731 flags &= ~(EF_ARM_LE8 | EF_ARM_BE8);
3732 break;
3733
3734 default:
3735 fprintf (file, _(" <EABI version unrecognised>"));
3736 break;
3737 }
3738
3739 flags &= ~ EF_ARM_EABIMASK;
3740
3741 if (flags & EF_ARM_RELEXEC)
3742 fprintf (file, _(" [relocatable executable]"));
3743
3744 if (flags & EF_ARM_HASENTRY)
3745 fprintf (file, _(" [has entry point]"));
3746
3747 flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY);
3748
3749 if (flags)
3750 fprintf (file, _("<Unrecognised flag bits set>"));
3751
3752 fputc ('\n', file);
3753
3754 return TRUE;
3755}
3756
3757static int
3758elf32_arm_get_symbol_type (Elf_Internal_Sym * elf_sym, int type)
3759{
3760 switch (ELF_ST_TYPE (elf_sym->st_info))
3761 {
3762 case STT_ARM_TFUNC:
3763 return ELF_ST_TYPE (elf_sym->st_info);
3764
3765 case STT_ARM_16BIT:
3766 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
3767 This allows us to distinguish between data used by Thumb instructions
3768 and non-data (which is probably code) inside Thumb regions of an
3769 executable. */
3770 if (type != STT_OBJECT)
3771 return ELF_ST_TYPE (elf_sym->st_info);
3772 break;
3773
3774 default:
3775 break;
3776 }
3777
3778 return type;
3779}
3780
3781static asection *
3782elf32_arm_gc_mark_hook (asection * sec,
3783 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3784 Elf_Internal_Rela * rel,
3785 struct elf_link_hash_entry * h,
3786 Elf_Internal_Sym * sym)
3787{
3788 if (h != NULL)
3789 {
3790 switch (ELF32_R_TYPE (rel->r_info))
3791 {
3792 case R_ARM_GNU_VTINHERIT:
3793 case R_ARM_GNU_VTENTRY:
3794 break;
3795
3796 default:
3797 switch (h->root.type)
3798 {
3799 case bfd_link_hash_defined:
3800 case bfd_link_hash_defweak:
3801 return h->root.u.def.section;
3802
3803 case bfd_link_hash_common:
3804 return h->root.u.c.p->section;
3805
3806 default:
3807 break;
3808 }
3809 }
3810 }
3811 else
3812 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
3813
3814 return NULL;
3815}
3816
3817/* Update the got entry reference counts for the section being removed. */
3818
3819static bfd_boolean
3820elf32_arm_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
3821 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3822 asection * sec ATTRIBUTE_UNUSED,
3823 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
3824{
3825 Elf_Internal_Shdr *symtab_hdr;
3826 struct elf_link_hash_entry **sym_hashes;
3827 bfd_signed_vma *local_got_refcounts;
3828 const Elf_Internal_Rela *rel, *relend;
3829 unsigned long r_symndx;
3830 struct elf_link_hash_entry *h;
3831 struct elf32_arm_link_hash_table * globals;
3832
3833 globals = elf32_arm_hash_table (info);
3834
3835 elf_section_data (sec)->local_dynrel = NULL;
3836
3837 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3838 sym_hashes = elf_sym_hashes (abfd);
3839 local_got_refcounts = elf_local_got_refcounts (abfd);
3840
3841 relend = relocs + sec->reloc_count;
3842 for (rel = relocs; rel < relend; rel++)
3843 {
3844 int r_type;
3845
3846 r_type = ELF32_R_TYPE (rel->r_info);
3847#ifndef OLD_ARM_ABI
3848 r_type = arm_real_reloc_type (globals, r_type);
3849#endif
3850 switch (r_type)
3851 {
3852 case R_ARM_GOT32:
3853#ifndef OLD_ARM_ABI
3854 case R_ARM_GOT_PREL:
3855#endif
3856 r_symndx = ELF32_R_SYM (rel->r_info);
3857 if (r_symndx >= symtab_hdr->sh_info)
3858 {
3859 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3860 if (h->got.refcount > 0)
3861 h->got.refcount -= 1;
3862 }
3863 else if (local_got_refcounts != NULL)
3864 {
3865 if (local_got_refcounts[r_symndx] > 0)
3866 local_got_refcounts[r_symndx] -= 1;
3867 }
3868 break;
3869
3870 case R_ARM_ABS32:
3871 case R_ARM_REL32:
3872 case R_ARM_PC24:
3873 case R_ARM_PLT32:
3874#ifndef OLD_ARM_ABI
3875 case R_ARM_CALL:
3876 case R_ARM_JUMP24:
3877 case R_ARM_PREL31:
3878#endif
3879 r_symndx = ELF32_R_SYM (rel->r_info);
3880 if (r_symndx >= symtab_hdr->sh_info)
3881 {
3882 struct elf32_arm_link_hash_entry *eh;
3883 struct elf32_arm_relocs_copied **pp;
3884 struct elf32_arm_relocs_copied *p;
3885
3886 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3887
3888 if (h->plt.refcount > 0)
3889 h->plt.refcount -= 1;
3890
3891 if (r_type == R_ARM_ABS32
3892 || r_type == R_ARM_REL32)
3893 {
3894 eh = (struct elf32_arm_link_hash_entry *) h;
3895
3896 for (pp = &eh->relocs_copied; (p = *pp) != NULL;
3897 pp = &p->next)
3898 if (p->section == sec)
3899 {
3900 p->count -= 1;
3901 if (p->count == 0)
3902 *pp = p->next;
3903 break;
3904 }
3905 }
3906 }
3907 break;
3908
3909 default:
3910 break;
3911 }
3912 }
3913
3914 return TRUE;
3915}
3916
3917/* Look through the relocs for a section during the first phase. */
3918
3919static bfd_boolean
3920elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
3921 asection *sec, const Elf_Internal_Rela *relocs)
3922{
3923 Elf_Internal_Shdr *symtab_hdr;
3924 struct elf_link_hash_entry **sym_hashes;
3925 struct elf_link_hash_entry **sym_hashes_end;
3926 const Elf_Internal_Rela *rel;
3927 const Elf_Internal_Rela *rel_end;
3928 bfd *dynobj;
3929 asection *sreloc;
3930 bfd_vma *local_got_offsets;
3931 struct elf32_arm_link_hash_table *htab;
3932
3933 if (info->relocatable)
3934 return TRUE;
3935
3936 htab = elf32_arm_hash_table (info);
3937 sreloc = NULL;
3938
3939 dynobj = elf_hash_table (info)->dynobj;
3940 local_got_offsets = elf_local_got_offsets (abfd);
3941
3942 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3943 sym_hashes = elf_sym_hashes (abfd);
3944 sym_hashes_end = sym_hashes
3945 + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
3946
3947 if (!elf_bad_symtab (abfd))
3948 sym_hashes_end -= symtab_hdr->sh_info;
3949
3950 rel_end = relocs + sec->reloc_count;
3951 for (rel = relocs; rel < rel_end; rel++)
3952 {
3953 struct elf_link_hash_entry *h;
3954 unsigned long r_symndx;
3955 int r_type;
3956
3957 r_symndx = ELF32_R_SYM (rel->r_info);
3958 r_type = ELF32_R_TYPE (rel->r_info);
3959#ifndef OLD_ARM_ABI
3960 r_type = arm_real_reloc_type (htab, r_type);
3961#endif
3962 if (r_symndx < symtab_hdr->sh_info)
3963 h = NULL;
3964 else
3965 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3966
3967 switch (r_type)
3968 {
3969 case R_ARM_GOT32:
3970#ifndef OLD_ARM_ABI
3971 case R_ARM_GOT_PREL:
3972#endif
3973 /* This symbol requires a global offset table entry. */
3974 if (h != NULL)
3975 {
3976 h->got.refcount++;
3977 }
3978 else
3979 {
3980 bfd_signed_vma *local_got_refcounts;
3981
3982 /* This is a global offset table entry for a local symbol. */
3983 local_got_refcounts = elf_local_got_refcounts (abfd);
3984 if (local_got_refcounts == NULL)
3985 {
3986 bfd_size_type size;
3987
3988 size = symtab_hdr->sh_info;
3989 size *= (sizeof (bfd_signed_vma) + sizeof (char));
3990 local_got_refcounts = bfd_zalloc (abfd, size);
3991 if (local_got_refcounts == NULL)
3992 return FALSE;
3993 elf_local_got_refcounts (abfd) = local_got_refcounts;
3994 }
3995 local_got_refcounts[r_symndx] += 1;
3996 }
3997 if (r_type == R_ARM_GOT32)
3998 break;
3999 /* Fall through. */
4000
4001 case R_ARM_GOTOFF:
4002 case R_ARM_GOTPC:
4003 if (htab->sgot == NULL)
4004 {
4005 if (htab->root.dynobj == NULL)
4006 htab->root.dynobj = abfd;
4007 if (!create_got_section (htab->root.dynobj, info))
4008 return FALSE;
4009 }
4010 break;
4011
4012 case R_ARM_ABS32:
4013 case R_ARM_REL32:
4014 case R_ARM_PC24:
4015 case R_ARM_PLT32:
4016#ifndef OLD_ARM_ABI
4017 case R_ARM_CALL:
4018 case R_ARM_JUMP24:
4019 case R_ARM_PREL31:
4020#endif
4021 if (h != NULL)
4022 {
4023 /* If this reloc is in a read-only section, we might
4024 need a copy reloc. We can't check reliably at this
4025 stage whether the section is read-only, as input
4026 sections have not yet been mapped to output sections.
4027 Tentatively set the flag for now, and correct in
4028 adjust_dynamic_symbol. */
4029 if (!info->shared)
4030 h->non_got_ref = 1;
4031
4032 /* We may need a .plt entry if the function this reloc
4033 refers to is in a different object. We can't tell for
4034 sure yet, because something later might force the
4035 symbol local. */
4036 if (r_type == R_ARM_PC24
4037#ifndef OLD_ARM_ABI
4038 || r_type == R_ARM_CALL
4039 || r_type == R_ARM_JUMP24
4040 || r_type == R_ARM_PREL31
4041#endif
4042 || r_type == R_ARM_PLT32)
4043 h->needs_plt = 1;
4044
4045 /* If we create a PLT entry, this relocation will reference
4046 it, even if it's an ABS32 relocation. */
4047 h->plt.refcount += 1;
4048 }
4049
4050 /* If we are creating a shared library, and this is a reloc
4051 against a global symbol, or a non PC relative reloc
4052 against a local symbol, then we need to copy the reloc
4053 into the shared library. However, if we are linking with
4054 -Bsymbolic, we do not need to copy a reloc against a
4055 global symbol which is defined in an object we are
4056 including in the link (i.e., DEF_REGULAR is set). At
4057 this point we have not seen all the input files, so it is
4058 possible that DEF_REGULAR is not set now but will be set
4059 later (it is never cleared). We account for that
4060 possibility below by storing information in the
4061 relocs_copied field of the hash table entry. */
4062 if (info->shared
4063 && (sec->flags & SEC_ALLOC) != 0
4064 && ((r_type != R_ARM_PC24
4065 && r_type != R_ARM_PLT32
4066#ifndef OLD_ARM_ABI
4067 && r_type != R_ARM_CALL
4068 && r_type != R_ARM_JUMP24
4069 && r_type != R_ARM_PREL31
4070#endif
4071 && r_type != R_ARM_REL32)
4072 || (h != NULL
4073 && (! info->symbolic
4074 || !h->def_regular))))
4075 {
4076 struct elf32_arm_relocs_copied *p, **head;
4077
4078 /* When creating a shared object, we must copy these
4079 reloc types into the output file. We create a reloc
4080 section in dynobj and make room for this reloc. */
4081 if (sreloc == NULL)
4082 {
4083 const char * name;
4084
4085 name = (bfd_elf_string_from_elf_section
4086 (abfd,
4087 elf_elfheader (abfd)->e_shstrndx,
4088 elf_section_data (sec)->rel_hdr.sh_name));
4089 if (name == NULL)
4090 return FALSE;
4091
4092 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
4093 && strcmp (bfd_get_section_name (abfd, sec),
4094 name + 4) == 0);
4095
4096 sreloc = bfd_get_section_by_name (dynobj, name);
4097 if (sreloc == NULL)
4098 {
4099 flagword flags;
4100
4101 sreloc = bfd_make_section (dynobj, name);
4102 flags = (SEC_HAS_CONTENTS | SEC_READONLY
4103 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
4104 if ((sec->flags & SEC_ALLOC) != 0
4105 /* BPABI objects never have dynamic
4106 relocations mapped. */
4107 && !htab->symbian_p)
4108 flags |= SEC_ALLOC | SEC_LOAD;
4109 if (sreloc == NULL
4110 || ! bfd_set_section_flags (dynobj, sreloc, flags)
4111 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
4112 return FALSE;
4113 }
4114
4115 elf_section_data (sec)->sreloc = sreloc;
4116 }
4117
4118 /* If this is a global symbol, we count the number of
4119 relocations we need for this symbol. */
4120 if (h != NULL)
4121 {
4122 head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied;
4123 }
4124 else
4125 {
4126 /* Track dynamic relocs needed for local syms too.
4127 We really need local syms available to do this
4128 easily. Oh well. */
4129
4130 asection *s;
4131 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
4132 sec, r_symndx);
4133 if (s == NULL)
4134 return FALSE;
4135
4136 head = ((struct elf32_arm_relocs_copied **)
4137 &elf_section_data (s)->local_dynrel);
4138 }
4139
4140 p = *head;
4141 if (p == NULL || p->section != sec)
4142 {
4143 bfd_size_type amt = sizeof *p;
4144
4145 p = bfd_alloc (htab->root.dynobj, amt);
4146 if (p == NULL)
4147 return FALSE;
4148 p->next = *head;
4149 *head = p;
4150 p->section = sec;
4151 p->count = 0;
4152 }
4153
4154 if (r_type == R_ARM_ABS32
4155 || r_type == R_ARM_REL32)
4156 p->count += 1;
4157 }
4158 break;
4159
4160 /* This relocation describes the C++ object vtable hierarchy.
4161 Reconstruct it for later use during GC. */
4162 case R_ARM_GNU_VTINHERIT:
4163 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4164 return FALSE;
4165 break;
4166
4167 /* This relocation describes which C++ vtable entries are actually
4168 used. Record for later use during GC. */
4169 case R_ARM_GNU_VTENTRY:
4170 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
4171 return FALSE;
4172 break;
4173 }
4174 }
4175
4176 return TRUE;
4177}
4178
4179static bfd_boolean
4180is_arm_mapping_symbol_name (const char * name)
4181{
4182 return (name != NULL)
4183 && (name[0] == '$')
4184 && ((name[1] == 'a') || (name[1] == 't') || (name[1] == 'd'))
4185 && (name[2] == 0);
4186}
4187
4188/* Treat mapping symbols as special target symbols. */
4189
4190static bfd_boolean
4191elf32_arm_is_target_special_symbol (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym)
4192{
4193 return is_arm_mapping_symbol_name (sym->name);
4194}
4195
4196/* This is a copy of elf_find_function() from elf.c except that
4197 ARM mapping symbols are ignored when looking for function names
4198 and STT_ARM_TFUNC is considered to a function type. */
4199
4200static bfd_boolean
4201arm_elf_find_function (bfd * abfd ATTRIBUTE_UNUSED,
4202 asection * section,
4203 asymbol ** symbols,
4204 bfd_vma offset,
4205 const char ** filename_ptr,
4206 const char ** functionname_ptr)
4207{
4208 const char * filename = NULL;
4209 asymbol * func = NULL;
4210 bfd_vma low_func = 0;
4211 asymbol ** p;
4212
4213 for (p = symbols; *p != NULL; p++)
4214 {
4215 elf_symbol_type *q;
4216
4217 q = (elf_symbol_type *) *p;
4218
4219 switch (ELF_ST_TYPE (q->internal_elf_sym.st_info))
4220 {
4221 default:
4222 break;
4223 case STT_FILE:
4224 filename = bfd_asymbol_name (&q->symbol);
4225 break;
4226 case STT_FUNC:
4227 case STT_ARM_TFUNC:
4228 /* Skip $a and $t symbols. */
4229 if ((q->symbol.flags & BSF_LOCAL)
4230 && is_arm_mapping_symbol_name (q->symbol.name))
4231 continue;
4232 /* Fall through. */
4233 case STT_NOTYPE:
4234 if (bfd_get_section (&q->symbol) == section
4235 && q->symbol.value >= low_func
4236 && q->symbol.value <= offset)
4237 {
4238 func = (asymbol *) q;
4239 low_func = q->symbol.value;
4240 }
4241 break;
4242 }
4243 }
4244
4245 if (func == NULL)
4246 return FALSE;
4247
4248 if (filename_ptr)
4249 *filename_ptr = filename;
4250 if (functionname_ptr)
4251 *functionname_ptr = bfd_asymbol_name (func);
4252
4253 return TRUE;
4254}
4255
4256
4257/* Find the nearest line to a particular section and offset, for error
4258 reporting. This code is a duplicate of the code in elf.c, except
4259 that it uses arm_elf_find_function. */
4260
4261static bfd_boolean
4262elf32_arm_find_nearest_line (bfd * abfd,
4263 asection * section,
4264 asymbol ** symbols,
4265 bfd_vma offset,
4266 const char ** filename_ptr,
4267 const char ** functionname_ptr,
4268 unsigned int * line_ptr)
4269{
4270 bfd_boolean found = FALSE;
4271
4272 /* We skip _bfd_dwarf1_find_nearest_line since no known ARM toolchain uses it. */
4273
4274 if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
4275 filename_ptr, functionname_ptr,
4276 line_ptr, 0,
4277 & elf_tdata (abfd)->dwarf2_find_line_info))
4278 {
4279 if (!*functionname_ptr)
4280 arm_elf_find_function (abfd, section, symbols, offset,
4281 *filename_ptr ? NULL : filename_ptr,
4282 functionname_ptr);
4283
4284 return TRUE;
4285 }
4286
4287 if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset,
4288 & found, filename_ptr,
4289 functionname_ptr, line_ptr,
4290 & elf_tdata (abfd)->line_info))
4291 return FALSE;
4292
4293 if (found && (*functionname_ptr || *line_ptr))
4294 return TRUE;
4295
4296 if (symbols == NULL)
4297 return FALSE;
4298
4299 if (! arm_elf_find_function (abfd, section, symbols, offset,
4300 filename_ptr, functionname_ptr))
4301 return FALSE;
4302
4303 *line_ptr = 0;
4304 return TRUE;
4305}
4306
4307/* Adjust a symbol defined by a dynamic object and referenced by a
4308 regular object. The current definition is in some section of the
4309 dynamic object, but we're not including those sections. We have to
4310 change the definition to something the rest of the link can
4311 understand. */
4312
4313static bfd_boolean
4314elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info,
4315 struct elf_link_hash_entry * h)
4316{
4317 bfd * dynobj;
4318 asection * s;
4319 unsigned int power_of_two;
4320
4321 dynobj = elf_hash_table (info)->dynobj;
4322
4323 /* Make sure we know what is going on here. */
4324 BFD_ASSERT (dynobj != NULL
4325 && (h->needs_plt
4326 || h->u.weakdef != NULL
4327 || (h->def_dynamic
4328 && h->ref_regular
4329 && !h->def_regular)));
4330
4331 /* If this is a function, put it in the procedure linkage table. We
4332 will fill in the contents of the procedure linkage table later,
4333 when we know the address of the .got section. */
4334 if (h->type == STT_FUNC
4335 || h->needs_plt)
4336 {
4337 if (h->plt.refcount <= 0
4338 || SYMBOL_CALLS_LOCAL (info, h)
4339 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4340 && h->root.type == bfd_link_hash_undefweak))
4341 {
4342 /* This case can occur if we saw a PLT32 reloc in an input
4343 file, but the symbol was never referred to by a dynamic
4344 object, or if all references were garbage collected. In
4345 such a case, we don't actually need to build a procedure
4346 linkage table, and we can just do a PC24 reloc instead. */
4347 h->plt.offset = (bfd_vma) -1;
4348 h->needs_plt = 0;
4349 }
4350
4351 return TRUE;
4352 }
4353 else
4354 /* It's possible that we incorrectly decided a .plt reloc was
4355 needed for an R_ARM_PC24 or similar reloc to a non-function sym
4356 in check_relocs. We can't decide accurately between function
4357 and non-function syms in check-relocs; Objects loaded later in
4358 the link may change h->type. So fix it now. */
4359 h->plt.offset = (bfd_vma) -1;
4360
4361 /* If this is a weak symbol, and there is a real definition, the
4362 processor independent code will have arranged for us to see the
4363 real definition first, and we can just use the same value. */
4364 if (h->u.weakdef != NULL)
4365 {
4366 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
4367 || h->u.weakdef->root.type == bfd_link_hash_defweak);
4368 h->root.u.def.section = h->u.weakdef->root.u.def.section;
4369 h->root.u.def.value = h->u.weakdef->root.u.def.value;
4370 return TRUE;
4371 }
4372
4373 /* This is a reference to a symbol defined by a dynamic object which
4374 is not a function. */
4375
4376 /* If we are creating a shared library, we must presume that the
4377 only references to the symbol are via the global offset table.
4378 For such cases we need not do anything here; the relocations will
4379 be handled correctly by relocate_section. */
4380 if (info->shared)
4381 return TRUE;
4382
4383 /* We must allocate the symbol in our .dynbss section, which will
4384 become part of the .bss section of the executable. There will be
4385 an entry for this symbol in the .dynsym section. The dynamic
4386 object will contain position independent code, so all references
4387 from the dynamic object to this symbol will go through the global
4388 offset table. The dynamic linker will use the .dynsym entry to
4389 determine the address it must put in the global offset table, so
4390 both the dynamic object and the regular object will refer to the
4391 same memory location for the variable. */
4392 s = bfd_get_section_by_name (dynobj, ".dynbss");
4393 BFD_ASSERT (s != NULL);
4394
4395 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
4396 copy the initial value out of the dynamic object and into the
4397 runtime process image. We need to remember the offset into the
4398 .rel.bss section we are going to use. */
4399 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
4400 {
4401 asection *srel;
4402
4403 srel = bfd_get_section_by_name (dynobj, ".rel.bss");
4404 BFD_ASSERT (srel != NULL);
4405 srel->size += sizeof (Elf32_External_Rel);
4406 h->needs_copy = 1;
4407 }
4408
4409 /* We need to figure out the alignment required for this symbol. I
4410 have no idea how ELF linkers handle this. */
4411 power_of_two = bfd_log2 (h->size);
4412 if (power_of_two > 3)
4413 power_of_two = 3;
4414
4415 /* Apply the required alignment. */
4416 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
4417 if (power_of_two > bfd_get_section_alignment (dynobj, s))
4418 {
4419 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
4420 return FALSE;
4421 }
4422
4423 /* Define the symbol as being at this point in the section. */
4424 h->root.u.def.section = s;
4425 h->root.u.def.value = s->size;
4426
4427 /* Increment the section size to make room for the symbol. */
4428 s->size += h->size;
4429
4430 return TRUE;
4431}
4432
4433/* Allocate space in .plt, .got and associated reloc sections for
4434 dynamic relocs. */
4435
4436static bfd_boolean
4437allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
4438{
4439 struct bfd_link_info *info;
4440 struct elf32_arm_link_hash_table *htab;
4441 struct elf32_arm_link_hash_entry *eh;
4442 struct elf32_arm_relocs_copied *p;
4443
4444 if (h->root.type == bfd_link_hash_indirect)
4445 return TRUE;
4446
4447 if (h->root.type == bfd_link_hash_warning)
4448 /* When warning symbols are created, they **replace** the "real"
4449 entry in the hash table, thus we never get to see the real
4450 symbol in a hash traversal. So look at it now. */
4451 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4452
4453 info = (struct bfd_link_info *) inf;
4454 htab = elf32_arm_hash_table (info);
4455
4456 if (htab->root.dynamic_sections_created
4457 && h->plt.refcount > 0)
4458 {
4459 /* Make sure this symbol is output as a dynamic symbol.
4460 Undefined weak syms won't yet be marked as dynamic. */
4461 if (h->dynindx == -1
4462 && !h->forced_local)
4463 {
4464 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4465 return FALSE;
4466 }
4467
4468 if (info->shared
4469 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
4470 {
4471 asection *s = htab->splt;
4472
4473 /* If this is the first .plt entry, make room for the special
4474 first entry. */
4475 if (s->size == 0)
4476 s->size += htab->plt_header_size;
4477
4478 h->plt.offset = s->size;
4479
4480 /* If this symbol is not defined in a regular file, and we are
4481 not generating a shared library, then set the symbol to this
4482 location in the .plt. This is required to make function
4483 pointers compare as equal between the normal executable and
4484 the shared library. */
4485 if (! info->shared
4486 && !h->def_regular)
4487 {
4488 h->root.u.def.section = s;
4489 h->root.u.def.value = h->plt.offset;
4490 }
4491
4492 /* Make room for this entry. */
4493 s->size += htab->plt_entry_size;
4494
4495 if (!htab->symbian_p)
4496 /* We also need to make an entry in the .got.plt section, which
4497 will be placed in the .got section by the linker script. */
4498 htab->sgotplt->size += 4;
4499
4500 /* We also need to make an entry in the .rel.plt section. */
4501 htab->srelplt->size += sizeof (Elf32_External_Rel);
4502 }
4503 else
4504 {
4505 h->plt.offset = (bfd_vma) -1;
4506 h->needs_plt = 0;
4507 }
4508 }
4509 else
4510 {
4511 h->plt.offset = (bfd_vma) -1;
4512 h->needs_plt = 0;
4513 }
4514
4515 if (h->got.refcount > 0)
4516 {
4517 asection *s;
4518 bfd_boolean dyn;
4519
4520 /* Make sure this symbol is output as a dynamic symbol.
4521 Undefined weak syms won't yet be marked as dynamic. */
4522 if (h->dynindx == -1
4523 && !h->forced_local)
4524 {
4525 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4526 return FALSE;
4527 }
4528
4529 if (!htab->symbian_p)
4530 {
4531 s = htab->sgot;
4532 h->got.offset = s->size;
4533 s->size += 4;
4534 dyn = htab->root.dynamic_sections_created;
4535 if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4536 || h->root.type != bfd_link_hash_undefweak)
4537 && (info->shared
4538 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
4539 htab->srelgot->size += sizeof (Elf32_External_Rel);
4540 }
4541 }
4542 else
4543 h->got.offset = (bfd_vma) -1;
4544
4545 eh = (struct elf32_arm_link_hash_entry *) h;
4546 if (eh->relocs_copied == NULL)
4547 return TRUE;
4548
4549 /* In the shared -Bsymbolic case, discard space allocated for
4550 dynamic pc-relative relocs against symbols which turn out to be
4551 defined in regular objects. For the normal shared case, discard
4552 space for pc-relative relocs that have become local due to symbol
4553 visibility changes. */
4554
4555 if (info->shared)
4556 {
4557 /* Discard relocs on undefined weak syms with non-default
4558 visibility. */
4559 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4560 && h->root.type == bfd_link_hash_undefweak)
4561 eh->relocs_copied = NULL;
4562 }
4563 else
4564 {
4565 /* For the non-shared case, discard space for relocs against
4566 symbols which turn out to need copy relocs or are not
4567 dynamic. */
4568
4569 if (!h->non_got_ref
4570 && ((h->def_dynamic
4571 && !h->def_regular)
4572 || (htab->root.dynamic_sections_created
4573 && (h->root.type == bfd_link_hash_undefweak
4574 || h->root.type == bfd_link_hash_undefined))))
4575 {
4576 /* Make sure this symbol is output as a dynamic symbol.
4577 Undefined weak syms won't yet be marked as dynamic. */
4578 if (h->dynindx == -1
4579 && !h->forced_local)
4580 {
4581 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4582 return FALSE;
4583 }
4584
4585 /* If that succeeded, we know we'll be keeping all the
4586 relocs. */
4587 if (h->dynindx != -1)
4588 goto keep;
4589 }
4590
4591 eh->relocs_copied = NULL;
4592
4593 keep: ;
4594 }
4595
4596 /* Finally, allocate space. */
4597 for (p = eh->relocs_copied; p != NULL; p = p->next)
4598 {
4599 asection *sreloc = elf_section_data (p->section)->sreloc;
4600 sreloc->size += p->count * sizeof (Elf32_External_Rel);
4601 }
4602
4603 return TRUE;
4604}
4605
4606/* Find any dynamic relocs that apply to read-only sections. */
4607
4608static bfd_boolean
4609elf32_arm_readonly_dynrelocs (struct elf_link_hash_entry *h, PTR inf)
4610{
4611 struct elf32_arm_link_hash_entry *eh;
4612 struct elf32_arm_relocs_copied *p;
4613
4614 if (h->root.type == bfd_link_hash_warning)
4615 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4616
4617 eh = (struct elf32_arm_link_hash_entry *) h;
4618 for (p = eh->relocs_copied; p != NULL; p = p->next)
4619 {
4620 asection *s = p->section;
4621
4622 if (s != NULL && (s->flags & SEC_READONLY) != 0)
4623 {
4624 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4625
4626 info->flags |= DF_TEXTREL;
4627
4628 /* Not an error, just cut short the traversal. */
4629 return FALSE;
4630 }
4631 }
4632 return TRUE;
4633}
4634
4635/* Set the sizes of the dynamic sections. */
4636
4637static bfd_boolean
4638elf32_arm_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
4639 struct bfd_link_info * info)
4640{
4641 bfd * dynobj;
4642 asection * s;
4643 bfd_boolean plt;
4644 bfd_boolean relocs;
4645 bfd *ibfd;
4646 struct elf32_arm_link_hash_table *htab;
4647
4648 htab = elf32_arm_hash_table (info);
4649 dynobj = elf_hash_table (info)->dynobj;
4650 BFD_ASSERT (dynobj != NULL);
4651
4652 if (elf_hash_table (info)->dynamic_sections_created)
4653 {
4654 /* Set the contents of the .interp section to the interpreter. */
4655 if (info->executable)
4656 {
4657 s = bfd_get_section_by_name (dynobj, ".interp");
4658 BFD_ASSERT (s != NULL);
4659 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
4660 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
4661 }
4662 }
4663
4664 /* Set up .got offsets for local syms, and space for local dynamic
4665 relocs. */
4666 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
4667 {
4668 bfd_signed_vma *local_got;
4669 bfd_signed_vma *end_local_got;
4670 char *local_tls_type;
4671 bfd_size_type locsymcount;
4672 Elf_Internal_Shdr *symtab_hdr;
4673 asection *srel;
4674
4675 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
4676 continue;
4677
4678 for (s = ibfd->sections; s != NULL; s = s->next)
4679 {
4680 struct elf32_arm_relocs_copied *p;
4681
4682 for (p = *((struct elf32_arm_relocs_copied **)
4683 &elf_section_data (s)->local_dynrel);
4684 p != NULL;
4685 p = p->next)
4686 {
4687 if (!bfd_is_abs_section (p->section)
4688 && bfd_is_abs_section (p->section->output_section))
4689 {
4690 /* Input section has been discarded, either because
4691 it is a copy of a linkonce section or due to
4692 linker script /DISCARD/, so we'll be discarding
4693 the relocs too. */
4694 }
4695 else if (p->count != 0)
4696 {
4697 srel = elf_section_data (p->section)->sreloc;
4698 srel->size += p->count * sizeof (Elf32_External_Rel);
4699 if ((p->section->output_section->flags & SEC_READONLY) != 0)
4700 info->flags |= DF_TEXTREL;
4701 }
4702 }
4703 }
4704
4705 local_got = elf_local_got_refcounts (ibfd);
4706 if (!local_got)
4707 continue;
4708
4709 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
4710 locsymcount = symtab_hdr->sh_info;
4711 end_local_got = local_got + locsymcount;
4712 s = htab->sgot;
4713 srel = htab->srelgot;
4714 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
4715 {
4716 if (*local_got > 0)
4717 {
4718 *local_got = s->size;
4719 s->size += 4;
4720 if (info->shared)
4721 srel->size += sizeof (Elf32_External_Rel);
4722 }
4723 else
4724 *local_got = (bfd_vma) -1;
4725 }
4726 }
4727
4728 /* Allocate global sym .plt and .got entries, and space for global
4729 sym dynamic relocs. */
4730 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info);
4731
4732 /* The check_relocs and adjust_dynamic_symbol entry points have
4733 determined the sizes of the various dynamic sections. Allocate
4734 memory for them. */
4735 plt = FALSE;
4736 relocs = FALSE;
4737 for (s = dynobj->sections; s != NULL; s = s->next)
4738 {
4739 const char * name;
4740 bfd_boolean strip;
4741
4742 if ((s->flags & SEC_LINKER_CREATED) == 0)
4743 continue;
4744
4745 /* It's OK to base decisions on the section name, because none
4746 of the dynobj section names depend upon the input files. */
4747 name = bfd_get_section_name (dynobj, s);
4748
4749 strip = FALSE;
4750
4751 if (strcmp (name, ".plt") == 0)
4752 {
4753 if (s->size == 0)
4754 {
4755 /* Strip this section if we don't need it; see the
4756 comment below. */
4757 strip = TRUE;
4758 }
4759 else
4760 {
4761 /* Remember whether there is a PLT. */
4762 plt = TRUE;
4763 }
4764 }
4765 else if (strncmp (name, ".rel", 4) == 0)
4766 {
4767 if (s->size == 0)
4768 {
4769 /* If we don't need this section, strip it from the
4770 output file. This is mostly to handle .rel.bss and
4771 .rel.plt. We must create both sections in
4772 create_dynamic_sections, because they must be created
4773 before the linker maps input sections to output
4774 sections. The linker does that before
4775 adjust_dynamic_symbol is called, and it is that
4776 function which decides whether anything needs to go
4777 into these sections. */
4778 strip = TRUE;
4779 }
4780 else
4781 {
4782 /* Remember whether there are any reloc sections other
4783 than .rel.plt. */
4784 if (strcmp (name, ".rel.plt") != 0)
4785 relocs = TRUE;
4786
4787 /* We use the reloc_count field as a counter if we need
4788 to copy relocs into the output file. */
4789 s->reloc_count = 0;
4790 }
4791 }
4792 else if (strncmp (name, ".got", 4) != 0)
4793 {
4794 /* It's not one of our sections, so don't allocate space. */
4795 continue;
4796 }
4797
4798 if (strip)
4799 {
4800 _bfd_strip_section_from_output (info, s);
4801 continue;
4802 }
4803
4804 /* Allocate memory for the section contents. */
4805 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
4806 if (s->contents == NULL && s->size != 0)
4807 return FALSE;
4808 }
4809
4810 if (elf_hash_table (info)->dynamic_sections_created)
4811 {
4812 /* Add some entries to the .dynamic section. We fill in the
4813 values later, in elf32_arm_finish_dynamic_sections, but we
4814 must add the entries now so that we get the correct size for
4815 the .dynamic section. The DT_DEBUG entry is filled in by the
4816 dynamic linker and used by the debugger. */
4817#define add_dynamic_entry(TAG, VAL) \
4818 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4819
4820 if (!info->shared)
4821 {
4822 if (!add_dynamic_entry (DT_DEBUG, 0))
4823 return FALSE;
4824 }
4825
4826 if (plt)
4827 {
4828 if ( !add_dynamic_entry (DT_PLTGOT, 0)
4829 || !add_dynamic_entry (DT_PLTRELSZ, 0)
4830 || !add_dynamic_entry (DT_PLTREL, DT_REL)
4831 || !add_dynamic_entry (DT_JMPREL, 0))
4832 return FALSE;
4833 }
4834
4835 if (relocs)
4836 {
4837 if ( !add_dynamic_entry (DT_REL, 0)
4838 || !add_dynamic_entry (DT_RELSZ, 0)
4839 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
4840 return FALSE;
4841 }
4842
4843 /* If any dynamic relocs apply to a read-only section,
4844 then we need a DT_TEXTREL entry. */
4845 if ((info->flags & DF_TEXTREL) == 0)
4846 elf_link_hash_traverse (&htab->root, elf32_arm_readonly_dynrelocs,
4847 (PTR) info);
4848
4849 if ((info->flags & DF_TEXTREL) != 0)
4850 {
4851 if (!add_dynamic_entry (DT_TEXTREL, 0))
4852 return FALSE;
4853 info->flags |= DF_TEXTREL;
4854 }
4855 }
4856#undef add_synamic_entry
4857
4858 return TRUE;
4859}
4860
4861/* Finish up dynamic symbol handling. We set the contents of various
4862 dynamic sections here. */
4863
4864static bfd_boolean
4865elf32_arm_finish_dynamic_symbol (bfd * output_bfd, struct bfd_link_info * info,
4866 struct elf_link_hash_entry * h, Elf_Internal_Sym * sym)
4867{
4868 bfd * dynobj;
4869 struct elf32_arm_link_hash_table *htab;
4870
4871 dynobj = elf_hash_table (info)->dynobj;
4872 htab = elf32_arm_hash_table (info);
4873
4874 if (h->plt.offset != (bfd_vma) -1)
4875 {
4876 asection * splt;
4877 asection * srel;
4878 bfd_byte *loc;
4879 bfd_vma plt_index;
4880 Elf_Internal_Rela rel;
4881
4882 /* This symbol has an entry in the procedure linkage table. Set
4883 it up. */
4884
4885 BFD_ASSERT (h->dynindx != -1);
4886
4887 splt = bfd_get_section_by_name (dynobj, ".plt");
4888 srel = bfd_get_section_by_name (dynobj, ".rel.plt");
4889 BFD_ASSERT (splt != NULL && srel != NULL);
4890
4891 /* Get the index in the procedure linkage table which
4892 corresponds to this symbol. This is the index of this symbol
4893 in all the symbols for which we are making plt entries. The
4894 first entry in the procedure linkage table is reserved. */
4895 plt_index = ((h->plt.offset - htab->plt_header_size)
4896 / htab->plt_entry_size);
4897
4898 /* Fill in the entry in the procedure linkage table. */
4899 if (htab->symbian_p)
4900 {
4901 unsigned i;
4902 for (i = 0; i < htab->plt_entry_size / 4; ++i)
4903 bfd_put_32 (output_bfd,
4904 elf32_arm_symbian_plt_entry[i],
4905 splt->contents + h->plt.offset + 4 * i);
4906
4907 /* Fill in the entry in the .rel.plt section. */
4908 rel.r_offset = (splt->output_section->vma
4909 + splt->output_offset
4910 + h->plt.offset + 4 * (i - 1));
4911 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
4912 }
4913 else
4914 {
4915 bfd_vma got_offset;
4916 bfd_vma got_displacement;
4917 asection * sgot;
4918
4919 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
4920 BFD_ASSERT (sgot != NULL);
4921
4922 /* Get the offset into the .got table of the entry that
4923 corresponds to this function. Each .got entry is 4 bytes.
4924 The first three are reserved. */
4925 got_offset = (plt_index + 3) * 4;
4926
4927 /* Calculate the displacement between the PLT slot and the
4928 entry in the GOT. */
4929 got_displacement = (sgot->output_section->vma
4930 + sgot->output_offset
4931 + got_offset
4932 - splt->output_section->vma
4933 - splt->output_offset
4934 - h->plt.offset
4935 - 8);
4936
4937 BFD_ASSERT ((got_displacement & 0xf0000000) == 0);
4938
4939 bfd_put_32 (output_bfd, elf32_arm_plt_entry[0] | ((got_displacement & 0x0ff00000) >> 20),
4940 splt->contents + h->plt.offset + 0);
4941 bfd_put_32 (output_bfd, elf32_arm_plt_entry[1] | ((got_displacement & 0x000ff000) >> 12),
4942 splt->contents + h->plt.offset + 4);
4943 bfd_put_32 (output_bfd, elf32_arm_plt_entry[2] | (got_displacement & 0x00000fff),
4944 splt->contents + h->plt.offset + 8);
4945#ifdef FOUR_WORD_PLT
4946 bfd_put_32 (output_bfd, elf32_arm_plt_entry[3],
4947 splt->contents + h->plt.offset + 12);
4948#endif
4949
4950 /* Fill in the entry in the global offset table. */
4951 bfd_put_32 (output_bfd,
4952 (splt->output_section->vma
4953 + splt->output_offset),
4954 sgot->contents + got_offset);
4955
4956 /* Fill in the entry in the .rel.plt section. */
4957 rel.r_offset = (sgot->output_section->vma
4958 + sgot->output_offset
4959 + got_offset);
4960 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT);
4961 }
4962
4963 loc = srel->contents + plt_index * sizeof (Elf32_External_Rel);
4964 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4965
4966 if (!h->def_regular)
4967 {
4968 /* Mark the symbol as undefined, rather than as defined in
4969 the .plt section. Leave the value alone. */
4970 sym->st_shndx = SHN_UNDEF;
4971 /* If the symbol is weak, we do need to clear the value.
4972 Otherwise, the PLT entry would provide a definition for
4973 the symbol even if the symbol wasn't defined anywhere,
4974 and so the symbol would never be NULL. */
4975 if (!h->ref_regular_nonweak)
4976 sym->st_value = 0;
4977 }
4978 }
4979
4980 if (h->got.offset != (bfd_vma) -1)
4981 {
4982 asection * sgot;
4983 asection * srel;
4984 Elf_Internal_Rela rel;
4985 bfd_byte *loc;
4986
4987 /* This symbol has an entry in the global offset table. Set it
4988 up. */
4989 sgot = bfd_get_section_by_name (dynobj, ".got");
4990 srel = bfd_get_section_by_name (dynobj, ".rel.got");
4991 BFD_ASSERT (sgot != NULL && srel != NULL);
4992
4993 rel.r_offset = (sgot->output_section->vma
4994 + sgot->output_offset
4995 + (h->got.offset &~ (bfd_vma) 1));
4996
4997 /* If this is a static link, or it is a -Bsymbolic link and the
4998 symbol is defined locally or was forced to be local because
4999 of a version file, we just want to emit a RELATIVE reloc.
5000 The entry in the global offset table will already have been
5001 initialized in the relocate_section function. */
5002 if (info->shared
5003 && SYMBOL_REFERENCES_LOCAL (info, h))
5004 {
5005 BFD_ASSERT((h->got.offset & 1) != 0);
5006 rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
5007 }
5008 else
5009 {
5010 BFD_ASSERT((h->got.offset & 1) == 0);
5011 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
5012 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
5013 }
5014
5015 loc = srel->contents + srel->reloc_count++ * sizeof (Elf32_External_Rel);
5016 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5017 }
5018
5019 if (h->needs_copy)
5020 {
5021 asection * s;
5022 Elf_Internal_Rela rel;
5023 bfd_byte *loc;
5024
5025 /* This symbol needs a copy reloc. Set it up. */
5026 BFD_ASSERT (h->dynindx != -1
5027 && (h->root.type == bfd_link_hash_defined
5028 || h->root.type == bfd_link_hash_defweak));
5029
5030 s = bfd_get_section_by_name (h->root.u.def.section->owner,
5031 ".rel.bss");
5032 BFD_ASSERT (s != NULL);
5033
5034 rel.r_offset = (h->root.u.def.value
5035 + h->root.u.def.section->output_section->vma
5036 + h->root.u.def.section->output_offset);
5037 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY);
5038 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rel);
5039 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5040 }
5041
5042 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
5043 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
5044 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
5045 sym->st_shndx = SHN_ABS;
5046
5047 return TRUE;
5048}
5049
5050/* Finish up the dynamic sections. */
5051
5052static bfd_boolean
5053elf32_arm_finish_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info)
5054{
5055 bfd * dynobj;
5056 asection * sgot;
5057 asection * sdyn;
5058
5059 dynobj = elf_hash_table (info)->dynobj;
5060
5061 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
5062 BFD_ASSERT (elf32_arm_hash_table (info)->symbian_p || sgot != NULL);
5063 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
5064
5065 if (elf_hash_table (info)->dynamic_sections_created)
5066 {
5067 asection *splt;
5068 Elf32_External_Dyn *dyncon, *dynconend;
5069 struct elf32_arm_link_hash_table *htab;
5070
5071 htab = elf32_arm_hash_table (info);
5072 splt = bfd_get_section_by_name (dynobj, ".plt");
5073 BFD_ASSERT (splt != NULL && sdyn != NULL);
5074
5075 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5076 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5077
5078 for (; dyncon < dynconend; dyncon++)
5079 {
5080 Elf_Internal_Dyn dyn;
5081 const char * name;
5082 asection * s;
5083
5084 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5085
5086 switch (dyn.d_tag)
5087 {
5088 unsigned int type;
5089
5090 default:
5091 break;
5092
5093 case DT_HASH:
5094 name = ".hash";
5095 goto get_vma_if_bpabi;
5096 case DT_STRTAB:
5097 name = ".dynstr";
5098 goto get_vma_if_bpabi;
5099 case DT_SYMTAB:
5100 name = ".dynsym";
5101 goto get_vma_if_bpabi;
5102 case DT_VERSYM:
5103 name = ".gnu.version";
5104 goto get_vma_if_bpabi;
5105 case DT_VERDEF:
5106 name = ".gnu.version_d";
5107 goto get_vma_if_bpabi;
5108 case DT_VERNEED:
5109 name = ".gnu.version_r";
5110 goto get_vma_if_bpabi;
5111
5112 case DT_PLTGOT:
5113 name = ".got";
5114 goto get_vma;
5115 case DT_JMPREL:
5116 name = ".rel.plt";
5117 get_vma:
5118 s = bfd_get_section_by_name (output_bfd, name);
5119 BFD_ASSERT (s != NULL);
5120 if (!htab->symbian_p)
5121 dyn.d_un.d_ptr = s->vma;
5122 else
5123 /* In the BPABI, tags in the PT_DYNAMIC section point
5124 at the file offset, not the memory address, for the
5125 convenience of the post linker. */
5126 dyn.d_un.d_ptr = s->filepos;
5127 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5128 break;
5129
5130 get_vma_if_bpabi:
5131 if (htab->symbian_p)
5132 goto get_vma;
5133 break;
5134
5135 case DT_PLTRELSZ:
5136 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5137 BFD_ASSERT (s != NULL);
5138 dyn.d_un.d_val = s->size;
5139 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5140 break;
5141
5142 case DT_RELSZ:
5143 if (!htab->symbian_p)
5144 {
5145 /* My reading of the SVR4 ABI indicates that the
5146 procedure linkage table relocs (DT_JMPREL) should be
5147 included in the overall relocs (DT_REL). This is
5148 what Solaris does. However, UnixWare can not handle
5149 that case. Therefore, we override the DT_RELSZ entry
5150 here to make it not include the JMPREL relocs. Since
5151 the linker script arranges for .rel.plt to follow all
5152 other relocation sections, we don't have to worry
5153 about changing the DT_REL entry. */
5154 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5155 if (s != NULL)
5156 dyn.d_un.d_val -= s->size;
5157 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5158 break;
5159 }
5160 /* Fall through */
5161
5162 case DT_REL:
5163 case DT_RELA:
5164 case DT_RELASZ:
5165 /* In the BPABI, the DT_REL tag must point at the file
5166 offset, not the VMA, of the first relocation
5167 section. So, we use code similar to that in
5168 elflink.c, but do not check for SHF_ALLOC on the
5169 relcoation section, since relocations sections are
5170 never allocated under the BPABI. The comments above
5171 about Unixware notwithstanding, we include all of the
5172 relocations here. */
5173 if (htab->symbian_p)
5174 {
5175 unsigned int i;
5176 type = ((dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5177 ? SHT_REL : SHT_RELA);
5178 dyn.d_un.d_val = 0;
5179 for (i = 1; i < elf_numsections (output_bfd); i++)
5180 {
5181 Elf_Internal_Shdr *hdr
5182 = elf_elfsections (output_bfd)[i];
5183 if (hdr->sh_type == type)
5184 {
5185 if (dyn.d_tag == DT_RELSZ
5186 || dyn.d_tag == DT_RELASZ)
5187 dyn.d_un.d_val += hdr->sh_size;
5188 else if (dyn.d_un.d_val == 0
5189 || hdr->sh_offset < dyn.d_un.d_val)
5190 dyn.d_un.d_val = hdr->sh_offset;
5191 }
5192 }
5193 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5194 }
5195 break;
5196
5197 /* Set the bottom bit of DT_INIT/FINI if the
5198 corresponding function is Thumb. */
5199 case DT_INIT:
5200 name = info->init_function;
5201 goto get_sym;
5202 case DT_FINI:
5203 name = info->fini_function;
5204 get_sym:
5205 /* If it wasn't set by elf_bfd_final_link
5206 then there is nothing to adjust. */
5207 if (dyn.d_un.d_val != 0)
5208 {
5209 struct elf_link_hash_entry * eh;
5210
5211 eh = elf_link_hash_lookup (elf_hash_table (info), name,
5212 FALSE, FALSE, TRUE);
5213 if (eh != (struct elf_link_hash_entry *) NULL
5214 && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC)
5215 {
5216 dyn.d_un.d_val |= 1;
5217 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5218 }
5219 }
5220 break;
5221 }
5222 }
5223
5224 /* Fill in the first entry in the procedure linkage table. */
5225 if (splt->size > 0 && elf32_arm_hash_table (info)->plt_header_size)
5226 {
5227 bfd_vma got_displacement;
5228
5229 /* Calculate the displacement between the PLT slot and &GOT[0]. */
5230 got_displacement = (sgot->output_section->vma
5231 + sgot->output_offset
5232 - splt->output_section->vma
5233 - splt->output_offset
5234 - 16);
5235
5236 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[0], splt->contents + 0);
5237 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[1], splt->contents + 4);
5238 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[2], splt->contents + 8);
5239 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[3], splt->contents + 12);
5240#ifdef FOUR_WORD_PLT
5241 /* The displacement value goes in the otherwise-unused last word of
5242 the second entry. */
5243 bfd_put_32 (output_bfd, got_displacement, splt->contents + 28);
5244#else
5245 bfd_put_32 (output_bfd, got_displacement, splt->contents + 16);
5246#endif
5247 }
5248
5249 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5250 really seem like the right value. */
5251 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
5252 }
5253
5254 /* Fill in the first three entries in the global offset table. */
5255 if (sgot)
5256 {
5257 if (sgot->size > 0)
5258 {
5259 if (sdyn == NULL)
5260 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
5261 else
5262 bfd_put_32 (output_bfd,
5263 sdyn->output_section->vma + sdyn->output_offset,
5264 sgot->contents);
5265 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
5266 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
5267 }
5268
5269 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
5270 }
5271
5272 return TRUE;
5273}
5274
5275static void
5276elf32_arm_post_process_headers (bfd * abfd, struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
5277{
5278 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
5279 struct elf32_arm_link_hash_table *globals;
5280
5281 i_ehdrp = elf_elfheader (abfd);
5282
5283 i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION;
5284 i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION;
5285
5286 if (link_info)
5287 {
5288 globals = elf32_arm_hash_table (link_info);
5289 if (globals->byteswap_code)
5290 i_ehdrp->e_flags |= EF_ARM_BE8;
5291 }
5292}
5293
5294static enum elf_reloc_type_class
5295elf32_arm_reloc_type_class (const Elf_Internal_Rela *rela)
5296{
5297 switch ((int) ELF32_R_TYPE (rela->r_info))
5298 {
5299 case R_ARM_RELATIVE:
5300 return reloc_class_relative;
5301 case R_ARM_JUMP_SLOT:
5302 return reloc_class_plt;
5303 case R_ARM_COPY:
5304 return reloc_class_copy;
5305 default:
5306 return reloc_class_normal;
5307 }
5308}
5309
5310/* Set the right machine number for an Arm ELF file. */
5311
5312static bfd_boolean
5313elf32_arm_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr)
5314{
5315 if (hdr->sh_type == SHT_NOTE)
5316 *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS;
5317
5318 return TRUE;
5319}
5320
5321static void
5322elf32_arm_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED)
5323{
5324 bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
5325}
5326
5327/* Return TRUE if this is an unwinding table entry. */
5328
5329static bfd_boolean
5330is_arm_elf_unwind_section_name (bfd * abfd ATTRIBUTE_UNUSED, const char * name)
5331{
5332 size_t len1, len2;
5333
5334 len1 = sizeof (ELF_STRING_ARM_unwind) - 1;
5335 len2 = sizeof (ELF_STRING_ARM_unwind_once) - 1;
5336 return (strncmp (name, ELF_STRING_ARM_unwind, len1) == 0
5337 || strncmp (name, ELF_STRING_ARM_unwind_once, len2) == 0);
5338}
5339
5340
5341/* Set the type and flags for an ARM section. We do this by
5342 the section name, which is a hack, but ought to work. */
5343
5344static bfd_boolean
5345elf32_arm_fake_sections (bfd * abfd, Elf_Internal_Shdr * hdr, asection * sec)
5346{
5347 const char * name;
5348
5349 name = bfd_get_section_name (abfd, sec);
5350
5351 if (is_arm_elf_unwind_section_name (abfd, name))
5352 {
5353 hdr->sh_type = SHT_ARM_EXIDX;
5354 hdr->sh_flags |= SHF_LINK_ORDER;
5355 }
5356 return TRUE;
5357}
5358
5359/* Handle an ARM specific section when reading an object file.
5360 This is called when elf.c finds a section with an unknown type. */
5361
5362static bfd_boolean
5363elf32_arm_section_from_shdr (bfd *abfd,
5364 Elf_Internal_Shdr * hdr,
5365 const char *name)
5366{
5367 /* There ought to be a place to keep ELF backend specific flags, but
5368 at the moment there isn't one. We just keep track of the
5369 sections by their name, instead. Fortunately, the ABI gives
5370 names for all the ARM specific sections, so we will probably get
5371 away with this. */
5372 switch (hdr->sh_type)
5373 {
5374 case SHT_ARM_EXIDX:
5375 break;
5376
5377 default:
5378 return FALSE;
5379 }
5380
5381 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
5382 return FALSE;
5383
5384 return TRUE;
5385}
5386
5387/* Called for each symbol. Builds a section map based on mapping symbols.
5388 Does not alter any of the symbols. */
5389
5390static bfd_boolean
5391elf32_arm_output_symbol_hook (struct bfd_link_info *info,
5392 const char *name,
5393 Elf_Internal_Sym *elfsym,
5394 asection *input_sec,
5395 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
5396{
5397 int mapcount;
5398 elf32_arm_section_map *map;
5399 struct elf32_arm_link_hash_table *globals;
5400
5401 /* Only do this on final link. */
5402 if (info->relocatable)
5403 return TRUE;
5404
5405 /* Only build a map if we need to byteswap code. */
5406 globals = elf32_arm_hash_table (info);
5407 if (!globals->byteswap_code)
5408 return TRUE;
5409
5410 /* We only want mapping symbols. */
5411 if (! is_arm_mapping_symbol_name (name))
5412 return TRUE;
5413
5414 mapcount = ++(elf32_arm_section_data (input_sec)->mapcount);
5415 map = elf32_arm_section_data (input_sec)->map;
5416 /* TODO: This may be inefficient, but we probably don't usually have many
5417 mapping symbols per section. */
5418 map = bfd_realloc (map, mapcount * sizeof (elf32_arm_section_map));
5419 elf32_arm_section_data (input_sec)->map = map;
5420
5421 map[mapcount - 1].vma = elfsym->st_value;
5422 map[mapcount - 1].type = name[1];
5423 return TRUE;
5424}
5425
5426
5427/* Allocate target specific section data. */
5428
5429static bfd_boolean
5430elf32_arm_new_section_hook (bfd *abfd, asection *sec)
5431{
5432 struct _arm_elf_section_data *sdata;
5433 bfd_size_type amt = sizeof (*sdata);
5434
5435 sdata = bfd_zalloc (abfd, amt);
5436 if (sdata == NULL)
5437 return FALSE;
5438 sec->used_by_bfd = sdata;
5439
5440 return _bfd_elf_new_section_hook (abfd, sec);
5441}
5442
5443
5444/* Used to order a list of mapping symbols by address. */
5445
5446static int
5447elf32_arm_compare_mapping (const void * a, const void * b)
5448{
5449 return ((const elf32_arm_section_map *) a)->vma
5450 > ((const elf32_arm_section_map *) b)->vma;
5451}
5452
5453
5454/* Do code byteswapping. Return FALSE afterwards so that the section is
5455 written out as normal. */
5456
5457static bfd_boolean
5458elf32_arm_write_section (bfd *output_bfd ATTRIBUTE_UNUSED, asection *sec,
5459 bfd_byte *contents)
5460{
5461 int mapcount;
5462 elf32_arm_section_map *map;
5463 bfd_vma ptr;
5464 bfd_vma end;
5465 bfd_vma offset;
5466 bfd_byte tmp;
5467 int i;
5468
5469 mapcount = elf32_arm_section_data (sec)->mapcount;
5470 map = elf32_arm_section_data (sec)->map;
5471
5472 if (mapcount == 0)
5473 return FALSE;
5474
5475 qsort (map, mapcount, sizeof (elf32_arm_section_map),
5476 elf32_arm_compare_mapping);
5477
5478 offset = sec->output_section->vma + sec->output_offset;
5479 ptr = map[0].vma - offset;
5480 for (i = 0; i < mapcount; i++)
5481 {
5482 if (i == mapcount - 1)
5483 end = sec->size;
5484 else
5485 end = map[i + 1].vma - offset;
5486
5487 switch (map[i].type)
5488 {
5489 case 'a':
5490 /* Byte swap code words. */
5491 while (ptr + 3 < end)
5492 {
5493 tmp = contents[ptr];
5494 contents[ptr] = contents[ptr + 3];
5495 contents[ptr + 3] = tmp;
5496 tmp = contents[ptr + 1];
5497 contents[ptr + 1] = contents[ptr + 2];
5498 contents[ptr + 2] = tmp;
5499 ptr += 4;
5500 }
5501 break;
5502
5503 case 't':
5504 /* Byte swap code halfwords. */
5505 while (ptr + 1 < end)
5506 {
5507 tmp = contents[ptr];
5508 contents[ptr] = contents[ptr + 1];
5509 contents[ptr + 1] = tmp;
5510 ptr += 2;
5511 }
5512 break;
5513
5514 case 'd':
5515 /* Leave data alone. */
5516 break;
5517 }
5518 ptr = end;
5519 }
5520 free (map);
5521 return FALSE;
5522}
5523
5524#define ELF_ARCH bfd_arch_arm
5525#define ELF_MACHINE_CODE EM_ARM
5526#ifdef __QNXTARGET__
5527#define ELF_MAXPAGESIZE 0x1000
5528#else
5529#define ELF_MAXPAGESIZE 0x8000
5530#endif
5531
5532#define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
5533#define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
5534#define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
5535#define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
5536#define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
5537#define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
5538#define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
5539#define bfd_elf32_new_section_hook elf32_arm_new_section_hook
5540#define bfd_elf32_bfd_is_target_special_symbol elf32_arm_is_target_special_symbol
5541
5542#define elf_backend_get_symbol_type elf32_arm_get_symbol_type
5543#define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
5544#define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
5545#define elf_backend_check_relocs elf32_arm_check_relocs
5546#define elf_backend_relocate_section elf32_arm_relocate_section
5547#define elf_backend_write_section elf32_arm_write_section
5548#define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
5549#define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections
5550#define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
5551#define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
5552#define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook
5553#define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
5554#define elf_backend_post_process_headers elf32_arm_post_process_headers
5555#define elf_backend_reloc_type_class elf32_arm_reloc_type_class
5556#define elf_backend_object_p elf32_arm_object_p
5557#define elf_backend_section_flags elf32_arm_section_flags
5558#define elf_backend_fake_sections elf32_arm_fake_sections
5559#define elf_backend_section_from_shdr elf32_arm_section_from_shdr
5560#define elf_backend_final_write_processing elf32_arm_final_write_processing
5561#define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol
5562
5563#define elf_backend_can_refcount 1
5564#define elf_backend_can_gc_sections 1
5565#define elf_backend_plt_readonly 1
5566#define elf_backend_want_got_plt 1
5567#define elf_backend_want_plt_sym 0
5568#if !USE_REL
5569#define elf_backend_rela_normal 1
5570#endif
5571
5572#define elf_backend_got_header_size 12
5573
5574#include "elf32-target.h"
5575
5576/* Symbian OS Targets */
5577
5578#undef TARGET_LITTLE_SYM
5579#define TARGET_LITTLE_SYM bfd_elf32_littlearm_symbian_vec
5580#undef TARGET_LITTLE_NAME
5581#define TARGET_LITTLE_NAME "elf32-littlearm-symbian"
5582#undef TARGET_BIG_SYM
5583#define TARGET_BIG_SYM bfd_elf32_bigarm_symbian_vec
5584#undef TARGET_BIG_NAME
5585#define TARGET_BIG_NAME "elf32-bigarm-symbian"
5586
5587/* Like elf32_arm_link_hash_table_create -- but overrides
5588 appropriately for Symbian OS. */
5589static struct bfd_link_hash_table *
5590elf32_arm_symbian_link_hash_table_create (bfd *abfd)
5591{
5592 struct bfd_link_hash_table *ret;
5593
5594 ret = elf32_arm_link_hash_table_create (abfd);
5595 if (ret)
5596 {
5597 struct elf32_arm_link_hash_table *htab
5598 = (struct elf32_arm_link_hash_table *)ret;
5599 /* There is no PLT header for Symbian OS. */
5600 htab->plt_header_size = 0;
5601 /* The PLT entries are each three instructions. */
5602 htab->plt_entry_size = 4 * NUM_ELEM (elf32_arm_symbian_plt_entry);
5603 htab->symbian_p = 1;
5604 }
5605 return ret;
5606}
5607
5608/* In a BPABI executable, the dynamic linking sections do not go in
5609 the loadable read-only segment. The post-linker may wish to refer
5610 to these sections, but they are not part of the final program
5611 image. */
5612static struct bfd_elf_special_section const
5613 elf32_arm_symbian_special_sections[]=
5614{
5615 { ".dynamic", 8, 0, SHT_DYNAMIC, 0 },
5616 { ".dynstr", 7, 0, SHT_STRTAB, 0 },
5617 { ".dynsym", 7, 0, SHT_DYNSYM, 0 },
5618 { ".got", 4, 0, SHT_PROGBITS, 0 },
5619 { ".hash", 5, 0, SHT_HASH, 0 },
5620 { NULL, 0, 0, 0, 0 }
5621};
5622
5623static void
5624elf32_arm_symbian_begin_write_processing (bfd *abfd,
5625 struct bfd_link_info *link_info
5626 ATTRIBUTE_UNUSED)
5627{
5628 /* BPABI objects are never loaded directly by an OS kernel; they are
5629 processed by a postlinker first, into an OS-specific format. If
5630 the D_PAGED bit is set on the file, BFD will align segments on
5631 page boundaries, so that an OS can directly map the file. With
5632 BPABI objects, that just results in wasted space. In addition,
5633 because we clear the D_PAGED bit, map_sections_to_segments will
5634 recognize that the program headers should not be mapped into any
5635 loadable segment. */
5636 abfd->flags &= ~D_PAGED;
5637}
5638
5639static bfd_boolean
5640elf32_arm_symbian_modify_segment_map (bfd *abfd,
5641 struct bfd_link_info *info
5642 ATTRIBUTE_UNUSED)
5643{
5644 struct elf_segment_map *m;
5645 asection *dynsec;
5646
5647 /* BPABI shared libraries and executables should have a PT_DYNAMIC
5648 segment. However, because the .dynamic section is not marked
5649 with SEC_LOAD, the generic ELF code will not create such a
5650 segment. */
5651 dynsec = bfd_get_section_by_name (abfd, ".dynamic");
5652 if (dynsec)
5653 {
5654 m = _bfd_elf_make_dynamic_segment (abfd, dynsec);
5655 m->next = elf_tdata (abfd)->segment_map;
5656 elf_tdata (abfd)->segment_map = m;
5657 }
5658
5659 return TRUE;
5660}
5661
5662#undef elf32_bed
5663#define elf32_bed elf32_arm_symbian_bed
5664
5665/* The dynamic sections are not allocated on SymbianOS; the postlinker
5666 will process them and then discard them. */
5667#undef ELF_DYNAMIC_SEC_FLAGS
5668#define ELF_DYNAMIC_SEC_FLAGS \
5669 (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED)
5670
5671#undef bfd_elf32_bfd_link_hash_table_create
5672#define bfd_elf32_bfd_link_hash_table_create \
5673 elf32_arm_symbian_link_hash_table_create
5674
5675#undef elf_backend_special_sections
5676#define elf_backend_special_sections elf32_arm_symbian_special_sections
5677
5678#undef elf_backend_begin_write_processing
5679#define elf_backend_begin_write_processing \
5680 elf32_arm_symbian_begin_write_processing
5681
5682#undef elf_backend_modify_segment_map
5683#define elf_backend_modify_segment_map elf32_arm_symbian_modify_segment_map
5684
5685/* There is no .got section for BPABI objects, and hence no header. */
5686#undef elf_backend_got_header_size
5687#define elf_backend_got_header_size 0
5688
5689/* Similarly, there is no .got.plt section. */
5690#undef elf_backend_want_got_plt
5691#define elf_backend_want_got_plt 0
5692
5693#include "elf32-target.h"
5694
GDB Binutils - Deliverables
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