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2004-12-01 Paul Brook <paul@codesourcery.com>
[binutils.git] / bfd / elf32-arm.c
blob325d2e86251cb8094b5f6ded7c8d481c7f015231
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
39 static reloc_howto_type * elf32_arm_reloc_type_lookup
40 PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
41 static bfd_boolean elf32_arm_nabi_grok_prstatus
42 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
43 static 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
50 static 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 */
669 static 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 */
685 static 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 */
701 static 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 */
717 static 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. */
733 static 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. */
749 static 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
808 static reloc_howto_type *
809 elf32_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
842 static void
843 elf32_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
852 struct 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. */
859 static 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
887 static reloc_howto_type *
888 elf32_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 */
918 static bfd_boolean
919 elf32_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
950 static bfd_boolean
951 elf32_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
994 typedef unsigned long int insn32;
995 typedef 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. */
1022 static 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. */
1032 static 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. */
1046 static 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. */
1057 static 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 /* An initial stub used if the PLT entry is referenced from Thumb code. */
1067 #define PLT_THUMB_STUB_SIZE 4
1068 static const bfd_vma elf32_arm_plt_thumb_stub [] =
1069 {
1070 0x4778, /* bx pc */
1071 0x46c0 /* nop */
1072 };
1073
1074 /* The entries in a PLT when using a DLL-based target with multiple
1075 address spaces. */
1076 static const bfd_vma elf32_arm_symbian_plt_entry [] =
1077 {
1078 0xe51ff004, /* ldr pr, [pc, #-4] */
1079 0x00000000, /* dcd R_ARM_GLOB_DAT(X) */
1080 };
1081
1082 /* Used to build a map of a section. This is required for mixed-endian
1083 code/data. */
1084
1085 typedef struct elf32_elf_section_map
1086 {
1087 bfd_vma vma;
1088 char type;
1089 }
1090 elf32_arm_section_map;
1091
1092 struct _arm_elf_section_data
1093 {
1094 struct bfd_elf_section_data elf;
1095 int mapcount;
1096 elf32_arm_section_map *map;
1097 };
1098
1099 #define elf32_arm_section_data(sec) \
1100 ((struct _arm_elf_section_data *) elf_section_data (sec))
1101
1102 /* The ARM linker needs to keep track of the number of relocs that it
1103 decides to copy in check_relocs for each symbol. This is so that
1104 it can discard PC relative relocs if it doesn't need them when
1105 linking with -Bsymbolic. We store the information in a field
1106 extending the regular ELF linker hash table. */
1107
1108 /* This structure keeps track of the number of PC relative relocs we
1109 have copied for a given symbol. */
1110 struct elf32_arm_relocs_copied
1111 {
1112 /* Next section. */
1113 struct elf32_arm_relocs_copied * next;
1114 /* A section in dynobj. */
1115 asection * section;
1116 /* Number of relocs copied in this section. */
1117 bfd_size_type count;
1118 };
1119
1120 /* Arm ELF linker hash entry. */
1121 struct elf32_arm_link_hash_entry
1122 {
1123 struct elf_link_hash_entry root;
1124
1125 /* Number of PC relative relocs copied for this symbol. */
1126 struct elf32_arm_relocs_copied * relocs_copied;
1127
1128 /* We reference count Thumb references to a PLT entry separately,
1129 so that we can emit the Thumb trampoline only if needed. */
1130 bfd_signed_vma plt_thumb_refcount;
1131
1132 /* Since PLT entries have variable size if the Thumb prologue is
1133 used, we need to record the index into .got.plt instead of
1134 recomputing it from the PLT offset. */
1135 bfd_signed_vma plt_got_offset;
1136 };
1137
1138 /* Traverse an arm ELF linker hash table. */
1139 #define elf32_arm_link_hash_traverse(table, func, info) \
1140 (elf_link_hash_traverse \
1141 (&(table)->root, \
1142 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
1143 (info)))
1144
1145 /* Get the ARM elf linker hash table from a link_info structure. */
1146 #define elf32_arm_hash_table(info) \
1147 ((struct elf32_arm_link_hash_table *) ((info)->hash))
1148
1149 /* ARM ELF linker hash table. */
1150 struct elf32_arm_link_hash_table
1151 {
1152 /* The main hash table. */
1153 struct elf_link_hash_table root;
1154
1155 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
1156 bfd_size_type thumb_glue_size;
1157
1158 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
1159 bfd_size_type arm_glue_size;
1160
1161 /* An arbitrary input BFD chosen to hold the glue sections. */
1162 bfd * bfd_of_glue_owner;
1163
1164 /* Nonzero to output a BE8 image. */
1165 int byteswap_code;
1166
1167 /* Zero if R_ARM_TARGET1 means R_ARM_ABS32.
1168 Nonzero if R_ARM_TARGET1 means R_ARM_ABS32. */
1169 int target1_is_rel;
1170
1171 /* The relocation to use for R_ARM_TARGET2 relocations. */
1172 int target2_reloc;
1173
1174 /* The number of bytes in the initial entry in the PLT. */
1175 bfd_size_type plt_header_size;
1176
1177 /* The number of bytes in the subsequent PLT etries. */
1178 bfd_size_type plt_entry_size;
1179
1180 /* True if the target system is Symbian OS. */
1181 int symbian_p;
1182
1183 /* Short-cuts to get to dynamic linker sections. */
1184 asection *sgot;
1185 asection *sgotplt;
1186 asection *srelgot;
1187 asection *splt;
1188 asection *srelplt;
1189 asection *sdynbss;
1190 asection *srelbss;
1191
1192 /* Small local sym to section mapping cache. */
1193 struct sym_sec_cache sym_sec;
1194
1195 /* For convenience in allocate_dynrelocs. */
1196 bfd * obfd;
1197 };
1198
1199 /* Create an entry in an ARM ELF linker hash table. */
1200
1201 static struct bfd_hash_entry *
1202 elf32_arm_link_hash_newfunc (struct bfd_hash_entry * entry,
1203 struct bfd_hash_table * table,
1204 const char * string)
1205 {
1206 struct elf32_arm_link_hash_entry * ret =
1207 (struct elf32_arm_link_hash_entry *) entry;
1208
1209 /* Allocate the structure if it has not already been allocated by a
1210 subclass. */
1211 if (ret == (struct elf32_arm_link_hash_entry *) NULL)
1212 ret = bfd_hash_allocate (table, sizeof (struct elf32_arm_link_hash_entry));
1213 if (ret == NULL)
1214 return (struct bfd_hash_entry *) ret;
1215
1216 /* Call the allocation method of the superclass. */
1217 ret = ((struct elf32_arm_link_hash_entry *)
1218 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
1219 table, string));
1220 if (ret != NULL)
1221 {
1222 ret->relocs_copied = NULL;
1223 ret->plt_thumb_refcount = 0;
1224 ret->plt_got_offset = -1;
1225 }
1226
1227 return (struct bfd_hash_entry *) ret;
1228 }
1229
1230 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
1231 shortcuts to them in our hash table. */
1232
1233 static bfd_boolean
1234 create_got_section (bfd *dynobj, struct bfd_link_info *info)
1235 {
1236 struct elf32_arm_link_hash_table *htab;
1237
1238 htab = elf32_arm_hash_table (info);
1239 /* BPABI objects never have a GOT, or associated sections. */
1240 if (htab->symbian_p)
1241 return TRUE;
1242
1243 if (! _bfd_elf_create_got_section (dynobj, info))
1244 return FALSE;
1245
1246 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1247 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1248 if (!htab->sgot || !htab->sgotplt)
1249 abort ();
1250
1251 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
1252 if (htab->srelgot == NULL
1253 || ! bfd_set_section_flags (dynobj, htab->srelgot,
1254 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1255 | SEC_IN_MEMORY | SEC_LINKER_CREATED
1256 | SEC_READONLY))
1257 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1258 return FALSE;
1259 return TRUE;
1260 }
1261
1262 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1263 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1264 hash table. */
1265
1266 static bfd_boolean
1267 elf32_arm_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1268 {
1269 struct elf32_arm_link_hash_table *htab;
1270
1271 htab = elf32_arm_hash_table (info);
1272 if (!htab->sgot && !create_got_section (dynobj, info))
1273 return FALSE;
1274
1275 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1276 return FALSE;
1277
1278 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
1279 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
1280 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
1281 if (!info->shared)
1282 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
1283
1284 if (!htab->splt
1285 || !htab->srelplt
1286 || !htab->sdynbss
1287 || (!info->shared && !htab->srelbss))
1288 abort ();
1289
1290 return TRUE;
1291 }
1292
1293 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1294
1295 static void
1296 elf32_arm_copy_indirect_symbol (const struct elf_backend_data *bed,
1297 struct elf_link_hash_entry *dir,
1298 struct elf_link_hash_entry *ind)
1299 {
1300 struct elf32_arm_link_hash_entry *edir, *eind;
1301
1302 edir = (struct elf32_arm_link_hash_entry *) dir;
1303 eind = (struct elf32_arm_link_hash_entry *) ind;
1304
1305 if (eind->relocs_copied != NULL)
1306 {
1307 if (edir->relocs_copied != NULL)
1308 {
1309 struct elf32_arm_relocs_copied **pp;
1310 struct elf32_arm_relocs_copied *p;
1311
1312 if (ind->root.type == bfd_link_hash_indirect)
1313 abort ();
1314
1315 /* Add reloc counts against the weak sym to the strong sym
1316 list. Merge any entries against the same section. */
1317 for (pp = &eind->relocs_copied; (p = *pp) != NULL; )
1318 {
1319 struct elf32_arm_relocs_copied *q;
1320
1321 for (q = edir->relocs_copied; q != NULL; q = q->next)
1322 if (q->section == p->section)
1323 {
1324 q->count += p->count;
1325 *pp = p->next;
1326 break;
1327 }
1328 if (q == NULL)
1329 pp = &p->next;
1330 }
1331 *pp = edir->relocs_copied;
1332 }
1333
1334 edir->relocs_copied = eind->relocs_copied;
1335 eind->relocs_copied = NULL;
1336 }
1337
1338 /* If the direct symbol already has an associated PLT entry, the
1339 indirect symbol should not. If it doesn't, swap refcount information
1340 from the indirect symbol. */
1341 if (edir->plt_thumb_refcount == 0)
1342 {
1343 edir->plt_thumb_refcount = eind->plt_thumb_refcount;
1344 eind->plt_thumb_refcount = 0;
1345 }
1346 else
1347 BFD_ASSERT (eind->plt_thumb_refcount == 0);
1348
1349 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
1350 }
1351
1352 /* Create an ARM elf linker hash table. */
1353
1354 static struct bfd_link_hash_table *
1355 elf32_arm_link_hash_table_create (bfd *abfd)
1356 {
1357 struct elf32_arm_link_hash_table *ret;
1358 bfd_size_type amt = sizeof (struct elf32_arm_link_hash_table);
1359
1360 ret = bfd_malloc (amt);
1361 if (ret == NULL)
1362 return NULL;
1363
1364 if (!_bfd_elf_link_hash_table_init (& ret->root, abfd,
1365 elf32_arm_link_hash_newfunc))
1366 {
1367 free (ret);
1368 return NULL;
1369 }
1370
1371 ret->sgot = NULL;
1372 ret->sgotplt = NULL;
1373 ret->srelgot = NULL;
1374 ret->splt = NULL;
1375 ret->srelplt = NULL;
1376 ret->sdynbss = NULL;
1377 ret->srelbss = NULL;
1378 ret->thumb_glue_size = 0;
1379 ret->arm_glue_size = 0;
1380 ret->bfd_of_glue_owner = NULL;
1381 ret->byteswap_code = 0;
1382 ret->target1_is_rel = 0;
1383 ret->target2_reloc = R_ARM_NONE;
1384 #ifdef FOUR_WORD_PLT
1385 ret->plt_header_size = 16;
1386 ret->plt_entry_size = 16;
1387 #else
1388 ret->plt_header_size = 20;
1389 ret->plt_entry_size = 12;
1390 #endif
1391 ret->symbian_p = 0;
1392 ret->sym_sec.abfd = NULL;
1393 ret->obfd = abfd;
1394
1395 return &ret->root.root;
1396 }
1397
1398 /* Locate the Thumb encoded calling stub for NAME. */
1399
1400 static struct elf_link_hash_entry *
1401 find_thumb_glue (struct bfd_link_info *link_info,
1402 const char *name,
1403 bfd *input_bfd)
1404 {
1405 char *tmp_name;
1406 struct elf_link_hash_entry *hash;
1407 struct elf32_arm_link_hash_table *hash_table;
1408
1409 /* We need a pointer to the armelf specific hash table. */
1410 hash_table = elf32_arm_hash_table (link_info);
1411
1412 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1413 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1414
1415 BFD_ASSERT (tmp_name);
1416
1417 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1418
1419 hash = elf_link_hash_lookup
1420 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1421
1422 if (hash == NULL)
1423 /* xgettext:c-format */
1424 (*_bfd_error_handler) (_("%B: unable to find THUMB glue '%s' for `%s'"),
1425 input_bfd, tmp_name, name);
1426
1427 free (tmp_name);
1428
1429 return hash;
1430 }
1431
1432 /* Locate the ARM encoded calling stub for NAME. */
1433
1434 static struct elf_link_hash_entry *
1435 find_arm_glue (struct bfd_link_info *link_info,
1436 const char *name,
1437 bfd *input_bfd)
1438 {
1439 char *tmp_name;
1440 struct elf_link_hash_entry *myh;
1441 struct elf32_arm_link_hash_table *hash_table;
1442
1443 /* We need a pointer to the elfarm specific hash table. */
1444 hash_table = elf32_arm_hash_table (link_info);
1445
1446 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1447 + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1);
1448
1449 BFD_ASSERT (tmp_name);
1450
1451 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1452
1453 myh = elf_link_hash_lookup
1454 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1455
1456 if (myh == NULL)
1457 /* xgettext:c-format */
1458 (*_bfd_error_handler) (_("%B: unable to find ARM glue '%s' for `%s'"),
1459 input_bfd, tmp_name, name);
1460
1461 free (tmp_name);
1462
1463 return myh;
1464 }
1465
1466 /* ARM->Thumb glue:
1467
1468 .arm
1469 __func_from_arm:
1470 ldr r12, __func_addr
1471 bx r12
1472 __func_addr:
1473 .word func @ behave as if you saw a ARM_32 reloc. */
1474
1475 #define ARM2THUMB_GLUE_SIZE 12
1476 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1477 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1478 static const insn32 a2t3_func_addr_insn = 0x00000001;
1479
1480 /* Thumb->ARM: Thumb->(non-interworking aware) ARM
1481
1482 .thumb .thumb
1483 .align 2 .align 2
1484 __func_from_thumb: __func_from_thumb:
1485 bx pc push {r6, lr}
1486 nop ldr r6, __func_addr
1487 .arm mov lr, pc
1488 __func_change_to_arm: bx r6
1489 b func .arm
1490 __func_back_to_thumb:
1491 ldmia r13! {r6, lr}
1492 bx lr
1493 __func_addr:
1494 .word func */
1495
1496 #define THUMB2ARM_GLUE_SIZE 8
1497 static const insn16 t2a1_bx_pc_insn = 0x4778;
1498 static const insn16 t2a2_noop_insn = 0x46c0;
1499 static const insn32 t2a3_b_insn = 0xea000000;
1500
1501 #ifndef ELFARM_NABI_C_INCLUDED
1502 bfd_boolean
1503 bfd_elf32_arm_allocate_interworking_sections (struct bfd_link_info * info)
1504 {
1505 asection * s;
1506 bfd_byte * foo;
1507 struct elf32_arm_link_hash_table * globals;
1508
1509 globals = elf32_arm_hash_table (info);
1510
1511 BFD_ASSERT (globals != NULL);
1512
1513 if (globals->arm_glue_size != 0)
1514 {
1515 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1516
1517 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1518 ARM2THUMB_GLUE_SECTION_NAME);
1519
1520 BFD_ASSERT (s != NULL);
1521
1522 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1523
1524 s->size = globals->arm_glue_size;
1525 s->contents = foo;
1526 }
1527
1528 if (globals->thumb_glue_size != 0)
1529 {
1530 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1531
1532 s = bfd_get_section_by_name
1533 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1534
1535 BFD_ASSERT (s != NULL);
1536
1537 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1538
1539 s->size = globals->thumb_glue_size;
1540 s->contents = foo;
1541 }
1542
1543 return TRUE;
1544 }
1545
1546 static void
1547 record_arm_to_thumb_glue (struct bfd_link_info * link_info,
1548 struct elf_link_hash_entry * h)
1549 {
1550 const char * name = h->root.root.string;
1551 asection * s;
1552 char * tmp_name;
1553 struct elf_link_hash_entry * myh;
1554 struct bfd_link_hash_entry * bh;
1555 struct elf32_arm_link_hash_table * globals;
1556 bfd_vma val;
1557
1558 globals = elf32_arm_hash_table (link_info);
1559
1560 BFD_ASSERT (globals != NULL);
1561 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1562
1563 s = bfd_get_section_by_name
1564 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1565
1566 BFD_ASSERT (s != NULL);
1567
1568 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1);
1569
1570 BFD_ASSERT (tmp_name);
1571
1572 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1573
1574 myh = elf_link_hash_lookup
1575 (&(globals)->root, tmp_name, FALSE, FALSE, TRUE);
1576
1577 if (myh != NULL)
1578 {
1579 /* We've already seen this guy. */
1580 free (tmp_name);
1581 return;
1582 }
1583
1584 /* The only trick here is using hash_table->arm_glue_size as the value.
1585 Even though the section isn't allocated yet, this is where we will be
1586 putting it. */
1587 bh = NULL;
1588 val = globals->arm_glue_size + 1;
1589 _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner,
1590 tmp_name, BSF_GLOBAL, s, val,
1591 NULL, TRUE, FALSE, &bh);
1592
1593 myh = (struct elf_link_hash_entry *) bh;
1594 myh->type = ELF_ST_INFO (STB_LOCAL, STT_FUNC);
1595 myh->forced_local = 1;
1596
1597 free (tmp_name);
1598
1599 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1600
1601 return;
1602 }
1603
1604 static void
1605 record_thumb_to_arm_glue (struct bfd_link_info *link_info,
1606 struct elf_link_hash_entry *h)
1607 {
1608 const char *name = h->root.root.string;
1609 asection *s;
1610 char *tmp_name;
1611 struct elf_link_hash_entry *myh;
1612 struct bfd_link_hash_entry *bh;
1613 struct elf32_arm_link_hash_table *hash_table;
1614 bfd_vma val;
1615
1616 hash_table = elf32_arm_hash_table (link_info);
1617
1618 BFD_ASSERT (hash_table != NULL);
1619 BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL);
1620
1621 s = bfd_get_section_by_name
1622 (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1623
1624 BFD_ASSERT (s != NULL);
1625
1626 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1627 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1628
1629 BFD_ASSERT (tmp_name);
1630
1631 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1632
1633 myh = elf_link_hash_lookup
1634 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1635
1636 if (myh != NULL)
1637 {
1638 /* We've already seen this guy. */
1639 free (tmp_name);
1640 return;
1641 }
1642
1643 bh = NULL;
1644 val = hash_table->thumb_glue_size + 1;
1645 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner,
1646 tmp_name, BSF_GLOBAL, s, val,
1647 NULL, TRUE, FALSE, &bh);
1648
1649 /* If we mark it 'Thumb', the disassembler will do a better job. */
1650 myh = (struct elf_link_hash_entry *) bh;
1651 myh->type = ELF_ST_INFO (STB_LOCAL, STT_ARM_TFUNC);
1652 myh->forced_local = 1;
1653
1654 free (tmp_name);
1655
1656 #define CHANGE_TO_ARM "__%s_change_to_arm"
1657 #define BACK_FROM_ARM "__%s_back_from_arm"
1658
1659 /* Allocate another symbol to mark where we switch to Arm mode. */
1660 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1661 + strlen (CHANGE_TO_ARM) + 1);
1662
1663 BFD_ASSERT (tmp_name);
1664
1665 sprintf (tmp_name, CHANGE_TO_ARM, name);
1666
1667 bh = NULL;
1668 val = hash_table->thumb_glue_size + 4,
1669 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner,
1670 tmp_name, BSF_LOCAL, s, val,
1671 NULL, TRUE, FALSE, &bh);
1672
1673 free (tmp_name);
1674
1675 hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1676
1677 return;
1678 }
1679
1680 /* Add the glue sections to ABFD. This function is called from the
1681 linker scripts in ld/emultempl/{armelf}.em. */
1682
1683 bfd_boolean
1684 bfd_elf32_arm_add_glue_sections_to_bfd (bfd *abfd,
1685 struct bfd_link_info *info)
1686 {
1687 flagword flags;
1688 asection *sec;
1689
1690 /* If we are only performing a partial
1691 link do not bother adding the glue. */
1692 if (info->relocatable)
1693 return TRUE;
1694
1695 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1696
1697 if (sec == NULL)
1698 {
1699 /* Note: we do not include the flag SEC_LINKER_CREATED, as this
1700 will prevent elf_link_input_bfd() from processing the contents
1701 of this section. */
1702 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1703
1704 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1705
1706 if (sec == NULL
1707 || !bfd_set_section_flags (abfd, sec, flags)
1708 || !bfd_set_section_alignment (abfd, sec, 2))
1709 return FALSE;
1710
1711 /* Set the gc mark to prevent the section from being removed by garbage
1712 collection, despite the fact that no relocs refer to this section. */
1713 sec->gc_mark = 1;
1714 }
1715
1716 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1717
1718 if (sec == NULL)
1719 {
1720 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1721 | SEC_CODE | SEC_READONLY;
1722
1723 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1724
1725 if (sec == NULL
1726 || !bfd_set_section_flags (abfd, sec, flags)
1727 || !bfd_set_section_alignment (abfd, sec, 2))
1728 return FALSE;
1729
1730 sec->gc_mark = 1;
1731 }
1732
1733 return TRUE;
1734 }
1735
1736 /* Select a BFD to be used to hold the sections used by the glue code.
1737 This function is called from the linker scripts in ld/emultempl/
1738 {armelf/pe}.em */
1739
1740 bfd_boolean
1741 bfd_elf32_arm_get_bfd_for_interworking (bfd *abfd, struct bfd_link_info *info)
1742 {
1743 struct elf32_arm_link_hash_table *globals;
1744
1745 /* If we are only performing a partial link
1746 do not bother getting a bfd to hold the glue. */
1747 if (info->relocatable)
1748 return TRUE;
1749
1750 /* Make sure we don't attach the glue sections to a dynamic object. */
1751 BFD_ASSERT (!(abfd->flags & DYNAMIC));
1752
1753 globals = elf32_arm_hash_table (info);
1754
1755 BFD_ASSERT (globals != NULL);
1756
1757 if (globals->bfd_of_glue_owner != NULL)
1758 return TRUE;
1759
1760 /* Save the bfd for later use. */
1761 globals->bfd_of_glue_owner = abfd;
1762
1763 return TRUE;
1764 }
1765
1766 bfd_boolean
1767 bfd_elf32_arm_process_before_allocation (bfd *abfd,
1768 struct bfd_link_info *link_info,
1769 int byteswap_code)
1770 {
1771 Elf_Internal_Shdr *symtab_hdr;
1772 Elf_Internal_Rela *internal_relocs = NULL;
1773 Elf_Internal_Rela *irel, *irelend;
1774 bfd_byte *contents = NULL;
1775
1776 asection *sec;
1777 struct elf32_arm_link_hash_table *globals;
1778
1779 /* If we are only performing a partial link do not bother
1780 to construct any glue. */
1781 if (link_info->relocatable)
1782 return TRUE;
1783
1784 /* Here we have a bfd that is to be included on the link. We have a hook
1785 to do reloc rummaging, before section sizes are nailed down. */
1786 globals = elf32_arm_hash_table (link_info);
1787
1788 BFD_ASSERT (globals != NULL);
1789 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1790
1791 if (byteswap_code && !bfd_big_endian (abfd))
1792 {
1793 _bfd_error_handler (_("%B: BE8 images only valid in big-endian mode."),
1794 abfd);
1795 return FALSE;
1796 }
1797 globals->byteswap_code = byteswap_code;
1798
1799 /* Rummage around all the relocs and map the glue vectors. */
1800 sec = abfd->sections;
1801
1802 if (sec == NULL)
1803 return TRUE;
1804
1805 for (; sec != NULL; sec = sec->next)
1806 {
1807 if (sec->reloc_count == 0)
1808 continue;
1809
1810 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1811
1812 /* Load the relocs. */
1813 internal_relocs
1814 = _bfd_elf_link_read_relocs (abfd, sec, (void *) NULL,
1815 (Elf_Internal_Rela *) NULL, FALSE);
1816
1817 if (internal_relocs == NULL)
1818 goto error_return;
1819
1820 irelend = internal_relocs + sec->reloc_count;
1821 for (irel = internal_relocs; irel < irelend; irel++)
1822 {
1823 long r_type;
1824 unsigned long r_index;
1825
1826 struct elf_link_hash_entry *h;
1827
1828 r_type = ELF32_R_TYPE (irel->r_info);
1829 r_index = ELF32_R_SYM (irel->r_info);
1830
1831 /* These are the only relocation types we care about. */
1832 if ( r_type != R_ARM_PC24
1833 && r_type != R_ARM_PLT32
1834 #ifndef OLD_ARM_ABI
1835 && r_type != R_ARM_CALL
1836 && r_type != R_ARM_JUMP24
1837 #endif
1838 && r_type != R_ARM_THM_PC22)
1839 continue;
1840
1841 /* Get the section contents if we haven't done so already. */
1842 if (contents == NULL)
1843 {
1844 /* Get cached copy if it exists. */
1845 if (elf_section_data (sec)->this_hdr.contents != NULL)
1846 contents = elf_section_data (sec)->this_hdr.contents;
1847 else
1848 {
1849 /* Go get them off disk. */
1850 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
1851 goto error_return;
1852 }
1853 }
1854
1855 /* If the relocation is not against a symbol it cannot concern us. */
1856 h = NULL;
1857
1858 /* We don't care about local symbols. */
1859 if (r_index < symtab_hdr->sh_info)
1860 continue;
1861
1862 /* This is an external symbol. */
1863 r_index -= symtab_hdr->sh_info;
1864 h = (struct elf_link_hash_entry *)
1865 elf_sym_hashes (abfd)[r_index];
1866
1867 /* If the relocation is against a static symbol it must be within
1868 the current section and so cannot be a cross ARM/Thumb relocation. */
1869 if (h == NULL)
1870 continue;
1871
1872 /* If the call will go through a PLT entry then we do not need
1873 glue. */
1874 if (globals->splt != NULL && h->plt.offset != (bfd_vma) -1)
1875 continue;
1876
1877 switch (r_type)
1878 {
1879 case R_ARM_PC24:
1880 #ifndef OLD_ARM_ABI
1881 case R_ARM_CALL:
1882 case R_ARM_JUMP24:
1883 #endif
1884 /* This one is a call from arm code. We need to look up
1885 the target of the call. If it is a thumb target, we
1886 insert glue. */
1887 if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC)
1888 record_arm_to_thumb_glue (link_info, h);
1889 break;
1890
1891 case R_ARM_THM_PC22:
1892 /* This one is a call from thumb code. We look
1893 up the target of the call. If it is not a thumb
1894 target, we insert glue. */
1895 if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC)
1896 record_thumb_to_arm_glue (link_info, h);
1897 break;
1898
1899 default:
1900 break;
1901 }
1902 }
1903
1904 if (contents != NULL
1905 && elf_section_data (sec)->this_hdr.contents != contents)
1906 free (contents);
1907 contents = NULL;
1908
1909 if (internal_relocs != NULL
1910 && elf_section_data (sec)->relocs != internal_relocs)
1911 free (internal_relocs);
1912 internal_relocs = NULL;
1913 }
1914
1915 return TRUE;
1916
1917 error_return:
1918 if (contents != NULL
1919 && elf_section_data (sec)->this_hdr.contents != contents)
1920 free (contents);
1921 if (internal_relocs != NULL
1922 && elf_section_data (sec)->relocs != internal_relocs)
1923 free (internal_relocs);
1924
1925 return FALSE;
1926 }
1927 #endif
1928
1929
1930 #ifndef OLD_ARM_ABI
1931 /* Set target relocation values needed during linking. */
1932
1933 void
1934 bfd_elf32_arm_set_target_relocs (struct bfd_link_info *link_info,
1935 int target1_is_rel,
1936 char * target2_type)
1937 {
1938 struct elf32_arm_link_hash_table *globals;
1939
1940 globals = elf32_arm_hash_table (link_info);
1941
1942 globals->target1_is_rel = target1_is_rel;
1943 if (strcmp (target2_type, "rel") == 0)
1944 globals->target2_reloc = R_ARM_REL32;
1945 else if (strcmp (target2_type, "abs") == 0)
1946 globals->target2_reloc = R_ARM_ABS32;
1947 else if (strcmp (target2_type, "got-rel") == 0)
1948 globals->target2_reloc = R_ARM_GOT_PREL;
1949 else
1950 {
1951 _bfd_error_handler (_("Invalid TARGET2 relocation type '%s'."),
1952 target2_type);
1953 }
1954 }
1955 #endif
1956
1957 /* The thumb form of a long branch is a bit finicky, because the offset
1958 encoding is split over two fields, each in it's own instruction. They
1959 can occur in any order. So given a thumb form of long branch, and an
1960 offset, insert the offset into the thumb branch and return finished
1961 instruction.
1962
1963 It takes two thumb instructions to encode the target address. Each has
1964 11 bits to invest. The upper 11 bits are stored in one (identified by
1965 H-0.. see below), the lower 11 bits are stored in the other (identified
1966 by H-1).
1967
1968 Combine together and shifted left by 1 (it's a half word address) and
1969 there you have it.
1970
1971 Op: 1111 = F,
1972 H-0, upper address-0 = 000
1973 Op: 1111 = F,
1974 H-1, lower address-0 = 800
1975
1976 They can be ordered either way, but the arm tools I've seen always put
1977 the lower one first. It probably doesn't matter. krk@cygnus.com
1978
1979 XXX: Actually the order does matter. The second instruction (H-1)
1980 moves the computed address into the PC, so it must be the second one
1981 in the sequence. The problem, however is that whilst little endian code
1982 stores the instructions in HI then LOW order, big endian code does the
1983 reverse. nickc@cygnus.com. */
1984
1985 #define LOW_HI_ORDER 0xF800F000
1986 #define HI_LOW_ORDER 0xF000F800
1987
1988 static insn32
1989 insert_thumb_branch (insn32 br_insn, int rel_off)
1990 {
1991 unsigned int low_bits;
1992 unsigned int high_bits;
1993
1994 BFD_ASSERT ((rel_off & 1) != 1);
1995
1996 rel_off >>= 1; /* Half word aligned address. */
1997 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
1998 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
1999
2000 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
2001 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
2002 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
2003 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
2004 else
2005 /* FIXME: abort is probably not the right call. krk@cygnus.com */
2006 abort (); /* Error - not a valid branch instruction form. */
2007
2008 return br_insn;
2009 }
2010
2011 /* Thumb code calling an ARM function. */
2012
2013 static int
2014 elf32_thumb_to_arm_stub (struct bfd_link_info * info,
2015 const char * name,
2016 bfd * input_bfd,
2017 bfd * output_bfd,
2018 asection * input_section,
2019 bfd_byte * hit_data,
2020 asection * sym_sec,
2021 bfd_vma offset,
2022 bfd_signed_vma addend,
2023 bfd_vma val)
2024 {
2025 asection * s = 0;
2026 bfd_vma my_offset;
2027 unsigned long int tmp;
2028 long int ret_offset;
2029 struct elf_link_hash_entry * myh;
2030 struct elf32_arm_link_hash_table * globals;
2031
2032 myh = find_thumb_glue (info, name, input_bfd);
2033 if (myh == NULL)
2034 return FALSE;
2035
2036 globals = elf32_arm_hash_table (info);
2037
2038 BFD_ASSERT (globals != NULL);
2039 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2040
2041 my_offset = myh->root.u.def.value;
2042
2043 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
2044 THUMB2ARM_GLUE_SECTION_NAME);
2045
2046 BFD_ASSERT (s != NULL);
2047 BFD_ASSERT (s->contents != NULL);
2048 BFD_ASSERT (s->output_section != NULL);
2049
2050 if ((my_offset & 0x01) == 0x01)
2051 {
2052 if (sym_sec != NULL
2053 && sym_sec->owner != NULL
2054 && !INTERWORK_FLAG (sym_sec->owner))
2055 {
2056 (*_bfd_error_handler)
2057 (_("%B(%s): warning: interworking not enabled.\n"
2058 " first occurrence: %B: thumb call to arm"),
2059 sym_sec->owner, input_bfd, name);
2060
2061 return FALSE;
2062 }
2063
2064 --my_offset;
2065 myh->root.u.def.value = my_offset;
2066
2067 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
2068 s->contents + my_offset);
2069
2070 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
2071 s->contents + my_offset + 2);
2072
2073 ret_offset =
2074 /* Address of destination of the stub. */
2075 ((bfd_signed_vma) val)
2076 - ((bfd_signed_vma)
2077 /* Offset from the start of the current section
2078 to the start of the stubs. */
2079 (s->output_offset
2080 /* Offset of the start of this stub from the start of the stubs. */
2081 + my_offset
2082 /* Address of the start of the current section. */
2083 + s->output_section->vma)
2084 /* The branch instruction is 4 bytes into the stub. */
2085 + 4
2086 /* ARM branches work from the pc of the instruction + 8. */
2087 + 8);
2088
2089 bfd_put_32 (output_bfd,
2090 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
2091 s->contents + my_offset + 4);
2092 }
2093
2094 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
2095
2096 /* Now go back and fix up the original BL insn to point to here. */
2097 ret_offset =
2098 /* Address of where the stub is located. */
2099 (s->output_section->vma + s->output_offset + my_offset)
2100 /* Address of where the BL is located. */
2101 - (input_section->output_section->vma + input_section->output_offset
2102 + offset)
2103 /* Addend in the relocation. */
2104 - addend
2105 /* Biassing for PC-relative addressing. */
2106 - 8;
2107
2108 tmp = bfd_get_32 (input_bfd, hit_data
2109 - input_section->vma);
2110
2111 bfd_put_32 (output_bfd,
2112 (bfd_vma) insert_thumb_branch (tmp, ret_offset),
2113 hit_data - input_section->vma);
2114
2115 return TRUE;
2116 }
2117
2118 /* Arm code calling a Thumb function. */
2119
2120 static int
2121 elf32_arm_to_thumb_stub (struct bfd_link_info * info,
2122 const char * name,
2123 bfd * input_bfd,
2124 bfd * output_bfd,
2125 asection * input_section,
2126 bfd_byte * hit_data,
2127 asection * sym_sec,
2128 bfd_vma offset,
2129 bfd_signed_vma addend,
2130 bfd_vma val)
2131 {
2132 unsigned long int tmp;
2133 bfd_vma my_offset;
2134 asection * s;
2135 long int ret_offset;
2136 struct elf_link_hash_entry * myh;
2137 struct elf32_arm_link_hash_table * globals;
2138
2139 myh = find_arm_glue (info, name, input_bfd);
2140 if (myh == NULL)
2141 return FALSE;
2142
2143 globals = elf32_arm_hash_table (info);
2144
2145 BFD_ASSERT (globals != NULL);
2146 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2147
2148 my_offset = myh->root.u.def.value;
2149 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
2150 ARM2THUMB_GLUE_SECTION_NAME);
2151 BFD_ASSERT (s != NULL);
2152 BFD_ASSERT (s->contents != NULL);
2153 BFD_ASSERT (s->output_section != NULL);
2154
2155 if ((my_offset & 0x01) == 0x01)
2156 {
2157 if (sym_sec != NULL
2158 && sym_sec->owner != NULL
2159 && !INTERWORK_FLAG (sym_sec->owner))
2160 {
2161 (*_bfd_error_handler)
2162 (_("%B(%s): warning: interworking not enabled.\n"
2163 " first occurrence: %B: arm call to thumb"),
2164 sym_sec->owner, input_bfd, name);
2165 }
2166
2167 --my_offset;
2168 myh->root.u.def.value = my_offset;
2169
2170 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
2171 s->contents + my_offset);
2172
2173 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
2174 s->contents + my_offset + 4);
2175
2176 /* It's a thumb address. Add the low order bit. */
2177 bfd_put_32 (output_bfd, val | a2t3_func_addr_insn,
2178 s->contents + my_offset + 8);
2179 }
2180
2181 BFD_ASSERT (my_offset <= globals->arm_glue_size);
2182
2183 tmp = bfd_get_32 (input_bfd, hit_data);
2184 tmp = tmp & 0xFF000000;
2185
2186 /* Somehow these are both 4 too far, so subtract 8. */
2187 ret_offset = (s->output_offset
2188 + my_offset
2189 + s->output_section->vma
2190 - (input_section->output_offset
2191 + input_section->output_section->vma
2192 + offset + addend)
2193 - 8);
2194
2195 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
2196
2197 bfd_put_32 (output_bfd, (bfd_vma) tmp, hit_data - input_section->vma);
2198
2199 return TRUE;
2200 }
2201
2202
2203 #ifndef OLD_ARM_ABI
2204 /* Some relocations map to different relocations depending on the
2205 target. Return the real relocation. */
2206 static int
2207 arm_real_reloc_type (struct elf32_arm_link_hash_table * globals,
2208 int r_type)
2209 {
2210 switch (r_type)
2211 {
2212 case R_ARM_TARGET1:
2213 if (globals->target1_is_rel)
2214 return R_ARM_REL32;
2215 else
2216 return R_ARM_ABS32;
2217
2218 case R_ARM_TARGET2:
2219 return globals->target2_reloc;
2220
2221 default:
2222 return r_type;
2223 }
2224 }
2225 #endif /* OLD_ARM_ABI */
2226
2227
2228 /* Perform a relocation as part of a final link. */
2229
2230 static bfd_reloc_status_type
2231 elf32_arm_final_link_relocate (reloc_howto_type * howto,
2232 bfd * input_bfd,
2233 bfd * output_bfd,
2234 asection * input_section,
2235 bfd_byte * contents,
2236 Elf_Internal_Rela * rel,
2237 bfd_vma value,
2238 struct bfd_link_info * info,
2239 asection * sym_sec,
2240 const char * sym_name,
2241 int sym_flags,
2242 struct elf_link_hash_entry * h)
2243 {
2244 unsigned long r_type = howto->type;
2245 unsigned long r_symndx;
2246 bfd_byte * hit_data = contents + rel->r_offset;
2247 bfd * dynobj = NULL;
2248 Elf_Internal_Shdr * symtab_hdr;
2249 struct elf_link_hash_entry ** sym_hashes;
2250 bfd_vma * local_got_offsets;
2251 asection * sgot = NULL;
2252 asection * splt = NULL;
2253 asection * sreloc = NULL;
2254 bfd_vma addend;
2255 bfd_signed_vma signed_addend;
2256 struct elf32_arm_link_hash_table * globals;
2257
2258 globals = elf32_arm_hash_table (info);
2259
2260 #ifndef OLD_ARM_ABI
2261 /* Some relocation type map to different relocations depending on the
2262 target. We pick the right one here. */
2263 r_type = arm_real_reloc_type (globals, r_type);
2264 if (r_type != howto->type)
2265 howto = elf32_arm_howto_from_type (r_type);
2266 #endif /* OLD_ARM_ABI */
2267
2268 /* If the start address has been set, then set the EF_ARM_HASENTRY
2269 flag. Setting this more than once is redundant, but the cost is
2270 not too high, and it keeps the code simple.
2271
2272 The test is done here, rather than somewhere else, because the
2273 start address is only set just before the final link commences.
2274
2275 Note - if the user deliberately sets a start address of 0, the
2276 flag will not be set. */
2277 if (bfd_get_start_address (output_bfd) != 0)
2278 elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY;
2279
2280 dynobj = elf_hash_table (info)->dynobj;
2281 if (dynobj)
2282 {
2283 sgot = bfd_get_section_by_name (dynobj, ".got");
2284 splt = bfd_get_section_by_name (dynobj, ".plt");
2285 }
2286 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
2287 sym_hashes = elf_sym_hashes (input_bfd);
2288 local_got_offsets = elf_local_got_offsets (input_bfd);
2289 r_symndx = ELF32_R_SYM (rel->r_info);
2290
2291 #if USE_REL
2292 addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask;
2293
2294 if (addend & ((howto->src_mask + 1) >> 1))
2295 {
2296 signed_addend = -1;
2297 signed_addend &= ~ howto->src_mask;
2298 signed_addend |= addend;
2299 }
2300 else
2301 signed_addend = addend;
2302 #else
2303 addend = signed_addend = rel->r_addend;
2304 #endif
2305
2306 switch (r_type)
2307 {
2308 case R_ARM_NONE:
2309 return bfd_reloc_ok;
2310
2311 case R_ARM_PC24:
2312 case R_ARM_ABS32:
2313 case R_ARM_REL32:
2314 #ifndef OLD_ARM_ABI
2315 case R_ARM_CALL:
2316 case R_ARM_JUMP24:
2317 case R_ARM_XPC25:
2318 case R_ARM_PREL31:
2319 #endif
2320 case R_ARM_PLT32:
2321 /* r_symndx will be zero only for relocs against symbols
2322 from removed linkonce sections, or sections discarded by
2323 a linker script. */
2324 if (r_symndx == 0)
2325 return bfd_reloc_ok;
2326
2327 /* Handle relocations which should use the PLT entry. ABS32/REL32
2328 will use the symbol's value, which may point to a PLT entry, but we
2329 don't need to handle that here. If we created a PLT entry, all
2330 branches in this object should go to it. */
2331 if ((r_type != R_ARM_ABS32 && r_type != R_ARM_REL32)
2332 && h != NULL
2333 && splt != NULL
2334 && h->plt.offset != (bfd_vma) -1)
2335 {
2336 /* If we've created a .plt section, and assigned a PLT entry to
2337 this function, it should not be known to bind locally. If
2338 it were, we would have cleared the PLT entry. */
2339 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h));
2340
2341 value = (splt->output_section->vma
2342 + splt->output_offset
2343 + h->plt.offset);
2344 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2345 contents, rel->r_offset, value,
2346 (bfd_vma) 0);
2347 }
2348
2349 /* When generating a shared object, these relocations are copied
2350 into the output file to be resolved at run time. */
2351 if (info->shared
2352 && (input_section->flags & SEC_ALLOC)
2353 && (r_type != R_ARM_REL32
2354 || !SYMBOL_CALLS_LOCAL (info, h))
2355 && (h == NULL
2356 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2357 || h->root.type != bfd_link_hash_undefweak)
2358 && r_type != R_ARM_PC24
2359 #ifndef OLD_ARM_ABI
2360 && r_type != R_ARM_CALL
2361 && r_type != R_ARM_JUMP24
2362 && r_type != R_ARM_PREL31
2363 #endif
2364 && r_type != R_ARM_PLT32)
2365 {
2366 Elf_Internal_Rela outrel;
2367 bfd_byte *loc;
2368 bfd_boolean skip, relocate;
2369
2370 if (sreloc == NULL)
2371 {
2372 const char * name;
2373
2374 name = (bfd_elf_string_from_elf_section
2375 (input_bfd,
2376 elf_elfheader (input_bfd)->e_shstrndx,
2377 elf_section_data (input_section)->rel_hdr.sh_name));
2378 if (name == NULL)
2379 return bfd_reloc_notsupported;
2380
2381 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
2382 && strcmp (bfd_get_section_name (input_bfd,
2383 input_section),
2384 name + 4) == 0);
2385
2386 sreloc = bfd_get_section_by_name (dynobj, name);
2387 BFD_ASSERT (sreloc != NULL);
2388 }
2389
2390 skip = FALSE;
2391 relocate = FALSE;
2392
2393 outrel.r_offset =
2394 _bfd_elf_section_offset (output_bfd, info, input_section,
2395 rel->r_offset);
2396 if (outrel.r_offset == (bfd_vma) -1)
2397 skip = TRUE;
2398 else if (outrel.r_offset == (bfd_vma) -2)
2399 skip = TRUE, relocate = TRUE;
2400 outrel.r_offset += (input_section->output_section->vma
2401 + input_section->output_offset);
2402
2403 if (skip)
2404 memset (&outrel, 0, sizeof outrel);
2405 else if (h != NULL
2406 && h->dynindx != -1
2407 && (!info->shared
2408 || !info->symbolic
2409 || !h->def_regular))
2410 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2411 else
2412 {
2413 int symbol;
2414
2415 /* This symbol is local, or marked to become local. */
2416 relocate = TRUE;
2417 if (sym_flags == STT_ARM_TFUNC)
2418 value |= 1;
2419 if (globals->symbian_p)
2420 {
2421 /* On Symbian OS, the data segment and text segement
2422 can be relocated independently. Therefore, we
2423 must indicate the segment to which this
2424 relocation is relative. The BPABI allows us to
2425 use any symbol in the right segment; we just use
2426 the section symbol as it is convenient. (We
2427 cannot use the symbol given by "h" directly as it
2428 will not appear in the dynamic symbol table.) */
2429 symbol = elf_section_data (sym_sec->output_section)->dynindx;
2430 BFD_ASSERT (symbol != 0);
2431 }
2432 else
2433 /* On SVR4-ish systems, the dynamic loader cannot
2434 relocate the text and data segments independently,
2435 so the symbol does not matter. */
2436 symbol = 0;
2437 outrel.r_info = ELF32_R_INFO (symbol, R_ARM_RELATIVE);
2438 }
2439
2440 loc = sreloc->contents;
2441 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2442 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2443
2444 /* If this reloc is against an external symbol, we do not want to
2445 fiddle with the addend. Otherwise, we need to include the symbol
2446 value so that it becomes an addend for the dynamic reloc. */
2447 if (! relocate)
2448 return bfd_reloc_ok;
2449
2450 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2451 contents, rel->r_offset, value,
2452 (bfd_vma) 0);
2453 }
2454 else switch (r_type)
2455 {
2456 #ifndef OLD_ARM_ABI
2457 case R_ARM_XPC25: /* Arm BLX instruction. */
2458 case R_ARM_CALL:
2459 case R_ARM_JUMP24:
2460 #endif
2461 case R_ARM_PC24: /* Arm B/BL instruction */
2462 case R_ARM_PLT32:
2463 #ifndef OLD_ARM_ABI
2464 if (r_type == R_ARM_XPC25)
2465 {
2466 /* Check for Arm calling Arm function. */
2467 /* FIXME: Should we translate the instruction into a BL
2468 instruction instead ? */
2469 if (sym_flags != STT_ARM_TFUNC)
2470 (*_bfd_error_handler)
2471 (_("\%B: Warning: Arm BLX instruction targets Arm function '%s'."),
2472 input_bfd,
2473 h ? h->root.root.string : "(local)");
2474 }
2475 else
2476 #endif
2477 {
2478 /* Check for Arm calling Thumb function. */
2479 if (sym_flags == STT_ARM_TFUNC)
2480 {
2481 elf32_arm_to_thumb_stub (info, sym_name, input_bfd,
2482 output_bfd, input_section,
2483 hit_data, sym_sec, rel->r_offset,
2484 signed_addend, value);
2485 return bfd_reloc_ok;
2486 }
2487 }
2488
2489 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
2490 where:
2491 S is the address of the symbol in the relocation.
2492 P is address of the instruction being relocated.
2493 A is the addend (extracted from the instruction) in bytes.
2494
2495 S is held in 'value'.
2496 P is the base address of the section containing the
2497 instruction plus the offset of the reloc into that
2498 section, ie:
2499 (input_section->output_section->vma +
2500 input_section->output_offset +
2501 rel->r_offset).
2502 A is the addend, converted into bytes, ie:
2503 (signed_addend * 4)
2504
2505 Note: None of these operations have knowledge of the pipeline
2506 size of the processor, thus it is up to the assembler to
2507 encode this information into the addend. */
2508 value -= (input_section->output_section->vma
2509 + input_section->output_offset);
2510 value -= rel->r_offset;
2511 value += (signed_addend << howto->size);
2512
2513 signed_addend = value;
2514 signed_addend >>= howto->rightshift;
2515
2516 /* It is not an error for an undefined weak reference to be
2517 out of range. Any program that branches to such a symbol
2518 is going to crash anyway, so there is no point worrying
2519 about getting the destination exactly right. */
2520 if (! h || h->root.type != bfd_link_hash_undefweak)
2521 {
2522 /* Perform a signed range check. */
2523 if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1))
2524 || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1)))
2525 return bfd_reloc_overflow;
2526 }
2527
2528 #ifndef OLD_ARM_ABI
2529 /* If necessary set the H bit in the BLX instruction. */
2530 if (r_type == R_ARM_XPC25 && ((value & 2) == 2))
2531 value = (signed_addend & howto->dst_mask)
2532 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask))
2533 | (1 << 24);
2534 else
2535 #endif
2536 value = (signed_addend & howto->dst_mask)
2537 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask));
2538 break;
2539
2540 case R_ARM_ABS32:
2541 value += addend;
2542 if (sym_flags == STT_ARM_TFUNC)
2543 value |= 1;
2544 break;
2545
2546 case R_ARM_REL32:
2547 value -= (input_section->output_section->vma
2548 + input_section->output_offset + rel->r_offset);
2549 value += addend;
2550 break;
2551
2552 #ifndef OLD_ARM_ABI
2553 case R_ARM_PREL31:
2554 value -= (input_section->output_section->vma
2555 + input_section->output_offset + rel->r_offset);
2556 value += signed_addend;
2557 if (! h || h->root.type != bfd_link_hash_undefweak)
2558 {
2559 /* Check for overflow */
2560 if ((value ^ (value >> 1)) & (1 << 30))
2561 return bfd_reloc_overflow;
2562 }
2563 value &= 0x7fffffff;
2564 value |= (bfd_get_32 (input_bfd, hit_data) & 0x80000000);
2565 if (sym_flags == STT_ARM_TFUNC)
2566 value |= 1;
2567 break;
2568 #endif
2569 }
2570
2571 bfd_put_32 (input_bfd, value, hit_data);
2572 return bfd_reloc_ok;
2573
2574 case R_ARM_ABS8:
2575 value += addend;
2576 if ((long) value > 0x7f || (long) value < -0x80)
2577 return bfd_reloc_overflow;
2578
2579 bfd_put_8 (input_bfd, value, hit_data);
2580 return bfd_reloc_ok;
2581
2582 case R_ARM_ABS16:
2583 value += addend;
2584
2585 if ((long) value > 0x7fff || (long) value < -0x8000)
2586 return bfd_reloc_overflow;
2587
2588 bfd_put_16 (input_bfd, value, hit_data);
2589 return bfd_reloc_ok;
2590
2591 case R_ARM_ABS12:
2592 /* Support ldr and str instruction for the arm */
2593 /* Also thumb b (unconditional branch). ??? Really? */
2594 value += addend;
2595
2596 if ((long) value > 0x7ff || (long) value < -0x800)
2597 return bfd_reloc_overflow;
2598
2599 value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000);
2600 bfd_put_32 (input_bfd, value, hit_data);
2601 return bfd_reloc_ok;
2602
2603 case R_ARM_THM_ABS5:
2604 /* Support ldr and str instructions for the thumb. */
2605 #if USE_REL
2606 /* Need to refetch addend. */
2607 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2608 /* ??? Need to determine shift amount from operand size. */
2609 addend >>= howto->rightshift;
2610 #endif
2611 value += addend;
2612
2613 /* ??? Isn't value unsigned? */
2614 if ((long) value > 0x1f || (long) value < -0x10)
2615 return bfd_reloc_overflow;
2616
2617 /* ??? Value needs to be properly shifted into place first. */
2618 value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f;
2619 bfd_put_16 (input_bfd, value, hit_data);
2620 return bfd_reloc_ok;
2621
2622 #ifndef OLD_ARM_ABI
2623 case R_ARM_THM_XPC22:
2624 #endif
2625 case R_ARM_THM_PC22:
2626 /* Thumb BL (branch long instruction). */
2627 {
2628 bfd_vma relocation;
2629 bfd_boolean overflow = FALSE;
2630 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data);
2631 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2);
2632 bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift;
2633 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2634 bfd_vma check;
2635 bfd_signed_vma signed_check;
2636
2637 #if USE_REL
2638 /* Need to refetch the addend and squish the two 11 bit pieces
2639 together. */
2640 {
2641 bfd_vma upper = upper_insn & 0x7ff;
2642 bfd_vma lower = lower_insn & 0x7ff;
2643 upper = (upper ^ 0x400) - 0x400; /* Sign extend. */
2644 addend = (upper << 12) | (lower << 1);
2645 signed_addend = addend;
2646 }
2647 #endif
2648 #ifndef OLD_ARM_ABI
2649 if (r_type == R_ARM_THM_XPC22)
2650 {
2651 /* Check for Thumb to Thumb call. */
2652 /* FIXME: Should we translate the instruction into a BL
2653 instruction instead ? */
2654 if (sym_flags == STT_ARM_TFUNC)
2655 (*_bfd_error_handler)
2656 (_("%B: Warning: Thumb BLX instruction targets thumb function '%s'."),
2657 input_bfd,
2658 h ? h->root.root.string : "(local)");
2659 }
2660 else
2661 #endif
2662 {
2663 /* If it is not a call to Thumb, assume call to Arm.
2664 If it is a call relative to a section name, then it is not a
2665 function call at all, but rather a long jump. Calls through
2666 the PLT do not require stubs. */
2667 if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION
2668 && (h == NULL || splt == NULL
2669 || h->plt.offset == (bfd_vma) -1))
2670 {
2671 if (elf32_thumb_to_arm_stub
2672 (info, sym_name, input_bfd, output_bfd, input_section,
2673 hit_data, sym_sec, rel->r_offset, signed_addend, value))
2674 return bfd_reloc_ok;
2675 else
2676 return bfd_reloc_dangerous;
2677 }
2678 }
2679
2680 /* Handle calls via the PLT. */
2681 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1)
2682 {
2683 value = (splt->output_section->vma
2684 + splt->output_offset
2685 + h->plt.offset);
2686 /* Target the Thumb stub before the ARM PLT entry. */
2687 value -= 4;
2688 }
2689
2690 relocation = value + signed_addend;
2691
2692 relocation -= (input_section->output_section->vma
2693 + input_section->output_offset
2694 + rel->r_offset);
2695
2696 check = relocation >> howto->rightshift;
2697
2698 /* If this is a signed value, the rightshift just dropped
2699 leading 1 bits (assuming twos complement). */
2700 if ((bfd_signed_vma) relocation >= 0)
2701 signed_check = check;
2702 else
2703 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift);
2704
2705 /* Assumes two's complement. */
2706 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2707 overflow = TRUE;
2708
2709 #ifndef OLD_ARM_ABI
2710 if (r_type == R_ARM_THM_XPC22
2711 && ((lower_insn & 0x1800) == 0x0800))
2712 /* For a BLX instruction, make sure that the relocation is rounded up
2713 to a word boundary. This follows the semantics of the instruction
2714 which specifies that bit 1 of the target address will come from bit
2715 1 of the base address. */
2716 relocation = (relocation + 2) & ~ 3;
2717 #endif
2718 /* Put RELOCATION back into the insn. */
2719 upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff);
2720 lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff);
2721
2722 /* Put the relocated value back in the object file: */
2723 bfd_put_16 (input_bfd, upper_insn, hit_data);
2724 bfd_put_16 (input_bfd, lower_insn, hit_data + 2);
2725
2726 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok);
2727 }
2728 break;
2729
2730 case R_ARM_THM_PC11:
2731 /* Thumb B (branch) instruction). */
2732 {
2733 bfd_signed_vma relocation;
2734 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
2735 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2736 bfd_signed_vma signed_check;
2737
2738 #if USE_REL
2739 /* Need to refetch addend. */
2740 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2741 if (addend & ((howto->src_mask + 1) >> 1))
2742 {
2743 signed_addend = -1;
2744 signed_addend &= ~ howto->src_mask;
2745 signed_addend |= addend;
2746 }
2747 else
2748 signed_addend = addend;
2749 /* The value in the insn has been right shifted. We need to
2750 undo this, so that we can perform the address calculation
2751 in terms of bytes. */
2752 signed_addend <<= howto->rightshift;
2753 #endif
2754 relocation = value + signed_addend;
2755
2756 relocation -= (input_section->output_section->vma
2757 + input_section->output_offset
2758 + rel->r_offset);
2759
2760 relocation >>= howto->rightshift;
2761 signed_check = relocation;
2762 relocation &= howto->dst_mask;
2763 relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask));
2764
2765 bfd_put_16 (input_bfd, relocation, hit_data);
2766
2767 /* Assumes two's complement. */
2768 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2769 return bfd_reloc_overflow;
2770
2771 return bfd_reloc_ok;
2772 }
2773
2774 #ifndef OLD_ARM_ABI
2775 case R_ARM_ALU_PCREL7_0:
2776 case R_ARM_ALU_PCREL15_8:
2777 case R_ARM_ALU_PCREL23_15:
2778 {
2779 bfd_vma insn;
2780 bfd_vma relocation;
2781
2782 insn = bfd_get_32 (input_bfd, hit_data);
2783 #if USE_REL
2784 /* Extract the addend. */
2785 addend = (insn & 0xff) << ((insn & 0xf00) >> 7);
2786 signed_addend = addend;
2787 #endif
2788 relocation = value + signed_addend;
2789
2790 relocation -= (input_section->output_section->vma
2791 + input_section->output_offset
2792 + rel->r_offset);
2793 insn = (insn & ~0xfff)
2794 | ((howto->bitpos << 7) & 0xf00)
2795 | ((relocation >> howto->bitpos) & 0xff);
2796 bfd_put_32 (input_bfd, value, hit_data);
2797 }
2798 return bfd_reloc_ok;
2799 #endif
2800
2801 case R_ARM_GNU_VTINHERIT:
2802 case R_ARM_GNU_VTENTRY:
2803 return bfd_reloc_ok;
2804
2805 case R_ARM_COPY:
2806 return bfd_reloc_notsupported;
2807
2808 case R_ARM_GLOB_DAT:
2809 return bfd_reloc_notsupported;
2810
2811 case R_ARM_JUMP_SLOT:
2812 return bfd_reloc_notsupported;
2813
2814 case R_ARM_RELATIVE:
2815 return bfd_reloc_notsupported;
2816
2817 case R_ARM_GOTOFF:
2818 /* Relocation is relative to the start of the
2819 global offset table. */
2820
2821 BFD_ASSERT (sgot != NULL);
2822 if (sgot == NULL)
2823 return bfd_reloc_notsupported;
2824
2825 /* If we are addressing a Thumb function, we need to adjust the
2826 address by one, so that attempts to call the function pointer will
2827 correctly interpret it as Thumb code. */
2828 if (sym_flags == STT_ARM_TFUNC)
2829 value += 1;
2830
2831 /* Note that sgot->output_offset is not involved in this
2832 calculation. We always want the start of .got. If we
2833 define _GLOBAL_OFFSET_TABLE in a different way, as is
2834 permitted by the ABI, we might have to change this
2835 calculation. */
2836 value -= sgot->output_section->vma;
2837 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2838 contents, rel->r_offset, value,
2839 (bfd_vma) 0);
2840
2841 case R_ARM_GOTPC:
2842 /* Use global offset table as symbol value. */
2843 BFD_ASSERT (sgot != NULL);
2844
2845 if (sgot == NULL)
2846 return bfd_reloc_notsupported;
2847
2848 value = sgot->output_section->vma;
2849 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2850 contents, rel->r_offset, value,
2851 (bfd_vma) 0);
2852
2853 case R_ARM_GOT32:
2854 #ifndef OLD_ARM_ABI
2855 case R_ARM_GOT_PREL:
2856 #endif
2857 /* Relocation is to the entry for this symbol in the
2858 global offset table. */
2859 if (sgot == NULL)
2860 return bfd_reloc_notsupported;
2861
2862 if (h != NULL)
2863 {
2864 bfd_vma off;
2865 bfd_boolean dyn;
2866
2867 off = h->got.offset;
2868 BFD_ASSERT (off != (bfd_vma) -1);
2869 dyn = globals->root.dynamic_sections_created;
2870
2871 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2872 || (info->shared
2873 && SYMBOL_REFERENCES_LOCAL (info, h))
2874 || (ELF_ST_VISIBILITY (h->other)
2875 && h->root.type == bfd_link_hash_undefweak))
2876 {
2877 /* This is actually a static link, or it is a -Bsymbolic link
2878 and the symbol is defined locally. We must initialize this
2879 entry in the global offset table. Since the offset must
2880 always be a multiple of 4, we use the least significant bit
2881 to record whether we have initialized it already.
2882
2883 When doing a dynamic link, we create a .rel.got relocation
2884 entry to initialize the value. This is done in the
2885 finish_dynamic_symbol routine. */
2886 if ((off & 1) != 0)
2887 off &= ~1;
2888 else
2889 {
2890 /* If we are addressing a Thumb function, we need to
2891 adjust the address by one, so that attempts to
2892 call the function pointer will correctly
2893 interpret it as Thumb code. */
2894 if (sym_flags == STT_ARM_TFUNC)
2895 value |= 1;
2896
2897 bfd_put_32 (output_bfd, value, sgot->contents + off);
2898 h->got.offset |= 1;
2899 }
2900 }
2901
2902 value = sgot->output_offset + off;
2903 }
2904 else
2905 {
2906 bfd_vma off;
2907
2908 BFD_ASSERT (local_got_offsets != NULL &&
2909 local_got_offsets[r_symndx] != (bfd_vma) -1);
2910
2911 off = local_got_offsets[r_symndx];
2912
2913 /* The offset must always be a multiple of 4. We use the
2914 least significant bit to record whether we have already
2915 generated the necessary reloc. */
2916 if ((off & 1) != 0)
2917 off &= ~1;
2918 else
2919 {
2920 /* If we are addressing a Thumb function, we need to
2921 adjust the address by one, so that attempts to
2922 call the function pointer will correctly
2923 interpret it as Thumb code. */
2924 if (sym_flags == STT_ARM_TFUNC)
2925 value |= 1;
2926
2927 bfd_put_32 (output_bfd, value, sgot->contents + off);
2928
2929 if (info->shared)
2930 {
2931 asection * srelgot;
2932 Elf_Internal_Rela outrel;
2933 bfd_byte *loc;
2934
2935 srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
2936 BFD_ASSERT (srelgot != NULL);
2937
2938 outrel.r_offset = (sgot->output_section->vma
2939 + sgot->output_offset
2940 + off);
2941 outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
2942 loc = srelgot->contents;
2943 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2944 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2945 }
2946
2947 local_got_offsets[r_symndx] |= 1;
2948 }
2949
2950 value = sgot->output_offset + off;
2951 }
2952 if (r_type != R_ARM_GOT32)
2953 value += sgot->output_section->vma;
2954
2955 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2956 contents, rel->r_offset, value,
2957 (bfd_vma) 0);
2958
2959 case R_ARM_SBREL32:
2960 return bfd_reloc_notsupported;
2961
2962 case R_ARM_AMP_VCALL9:
2963 return bfd_reloc_notsupported;
2964
2965 case R_ARM_RSBREL32:
2966 return bfd_reloc_notsupported;
2967
2968 case R_ARM_THM_RPC22:
2969 return bfd_reloc_notsupported;
2970
2971 case R_ARM_RREL32:
2972 return bfd_reloc_notsupported;
2973
2974 case R_ARM_RABS32:
2975 return bfd_reloc_notsupported;
2976
2977 case R_ARM_RPC24:
2978 return bfd_reloc_notsupported;
2979
2980 case R_ARM_RBASE:
2981 return bfd_reloc_notsupported;
2982
2983 default:
2984 return bfd_reloc_notsupported;
2985 }
2986 }
2987
2988 #if USE_REL
2989 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
2990 static void
2991 arm_add_to_rel (bfd * abfd,
2992 bfd_byte * address,
2993 reloc_howto_type * howto,
2994 bfd_signed_vma increment)
2995 {
2996 bfd_signed_vma addend;
2997
2998 if (howto->type == R_ARM_THM_PC22)
2999 {
3000 int upper_insn, lower_insn;
3001 int upper, lower;
3002
3003 upper_insn = bfd_get_16 (abfd, address);
3004 lower_insn = bfd_get_16 (abfd, address + 2);
3005 upper = upper_insn & 0x7ff;
3006 lower = lower_insn & 0x7ff;
3007
3008 addend = (upper << 12) | (lower << 1);
3009 addend += increment;
3010 addend >>= 1;
3011
3012 upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff);
3013 lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff);
3014
3015 bfd_put_16 (abfd, (bfd_vma) upper_insn, address);
3016 bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2);
3017 }
3018 else
3019 {
3020 bfd_vma contents;
3021
3022 contents = bfd_get_32 (abfd, address);
3023
3024 /* Get the (signed) value from the instruction. */
3025 addend = contents & howto->src_mask;
3026 if (addend & ((howto->src_mask + 1) >> 1))
3027 {
3028 bfd_signed_vma mask;
3029
3030 mask = -1;
3031 mask &= ~ howto->src_mask;
3032 addend |= mask;
3033 }
3034
3035 /* Add in the increment, (which is a byte value). */
3036 switch (howto->type)
3037 {
3038 default:
3039 addend += increment;
3040 break;
3041
3042 case R_ARM_PC24:
3043 #ifndef OLD_ARM_ABI
3044 case R_ARM_CALL:
3045 case R_ARM_JUMP24:
3046 #endif
3047 addend <<= howto->size;
3048 addend += increment;
3049
3050 /* Should we check for overflow here ? */
3051
3052 /* Drop any undesired bits. */
3053 addend >>= howto->rightshift;
3054 break;
3055 }
3056
3057 contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask);
3058
3059 bfd_put_32 (abfd, contents, address);
3060 }
3061 }
3062 #endif /* USE_REL */
3063
3064 /* Relocate an ARM ELF section. */
3065 static bfd_boolean
3066 elf32_arm_relocate_section (bfd * output_bfd,
3067 struct bfd_link_info * info,
3068 bfd * input_bfd,
3069 asection * input_section,
3070 bfd_byte * contents,
3071 Elf_Internal_Rela * relocs,
3072 Elf_Internal_Sym * local_syms,
3073 asection ** local_sections)
3074 {
3075 Elf_Internal_Shdr *symtab_hdr;
3076 struct elf_link_hash_entry **sym_hashes;
3077 Elf_Internal_Rela *rel;
3078 Elf_Internal_Rela *relend;
3079 const char *name;
3080 struct elf32_arm_link_hash_table * globals;
3081
3082 #if !USE_REL
3083 if (info->relocatable)
3084 return TRUE;
3085 #endif
3086
3087 globals = elf32_arm_hash_table (info);
3088 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
3089 sym_hashes = elf_sym_hashes (input_bfd);
3090
3091 rel = relocs;
3092 relend = relocs + input_section->reloc_count;
3093 for (; rel < relend; rel++)
3094 {
3095 int r_type;
3096 reloc_howto_type * howto;
3097 unsigned long r_symndx;
3098 Elf_Internal_Sym * sym;
3099 asection * sec;
3100 struct elf_link_hash_entry * h;
3101 bfd_vma relocation;
3102 bfd_reloc_status_type r;
3103 arelent bfd_reloc;
3104
3105 r_symndx = ELF32_R_SYM (rel->r_info);
3106 r_type = ELF32_R_TYPE (rel->r_info);
3107 r_type = arm_real_reloc_type (globals, r_type);
3108
3109 if ( r_type == R_ARM_GNU_VTENTRY
3110 || r_type == R_ARM_GNU_VTINHERIT)
3111 continue;
3112
3113 bfd_reloc.howto = elf32_arm_howto_from_type (r_type);
3114 howto = bfd_reloc.howto;
3115
3116 #if USE_REL
3117 if (info->relocatable)
3118 {
3119 /* This is a relocatable link. We don't have to change
3120 anything, unless the reloc is against a section symbol,
3121 in which case we have to adjust according to where the
3122 section symbol winds up in the output section. */
3123 if (r_symndx < symtab_hdr->sh_info)
3124 {
3125 sym = local_syms + r_symndx;
3126 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3127 {
3128 sec = local_sections[r_symndx];
3129 arm_add_to_rel (input_bfd, contents + rel->r_offset,
3130 howto,
3131 (bfd_signed_vma) (sec->output_offset
3132 + sym->st_value));
3133 }
3134 }
3135
3136 continue;
3137 }
3138 #endif
3139
3140 /* This is a final link. */
3141 h = NULL;
3142 sym = NULL;
3143 sec = NULL;
3144
3145 if (r_symndx < symtab_hdr->sh_info)
3146 {
3147 sym = local_syms + r_symndx;
3148 sec = local_sections[r_symndx];
3149 #if USE_REL
3150 relocation = (sec->output_section->vma
3151 + sec->output_offset
3152 + sym->st_value);
3153 if ((sec->flags & SEC_MERGE)
3154 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3155 {
3156 asection *msec;
3157 bfd_vma addend, value;
3158
3159 if (howto->rightshift)
3160 {
3161 (*_bfd_error_handler)
3162 (_("%B(%A+0x%lx): %s relocation against SEC_MERGE section"),
3163 input_bfd, input_section,
3164 (long) rel->r_offset, howto->name);
3165 return FALSE;
3166 }
3167
3168 value = bfd_get_32 (input_bfd, contents + rel->r_offset);
3169
3170 /* Get the (signed) value from the instruction. */
3171 addend = value & howto->src_mask;
3172 if (addend & ((howto->src_mask + 1) >> 1))
3173 {
3174 bfd_signed_vma mask;
3175
3176 mask = -1;
3177 mask &= ~ howto->src_mask;
3178 addend |= mask;
3179 }
3180 msec = sec;
3181 addend =
3182 _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend)
3183 - relocation;
3184 addend += msec->output_section->vma + msec->output_offset;
3185 value = (value & ~ howto->dst_mask) | (addend & howto->dst_mask);
3186 bfd_put_32 (input_bfd, value, contents + rel->r_offset);
3187 }
3188 #else
3189 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3190 #endif
3191 }
3192 else
3193 {
3194 bfd_boolean warned;
3195 bfd_boolean unresolved_reloc;
3196
3197 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3198 r_symndx, symtab_hdr, sym_hashes,
3199 h, sec, relocation,
3200 unresolved_reloc, warned);
3201
3202 if (unresolved_reloc || relocation != 0)
3203 {
3204 /* In these cases, we don't need the relocation value.
3205 We check specially because in some obscure cases
3206 sec->output_section will be NULL. */
3207 switch (r_type)
3208 {
3209 case R_ARM_PC24:
3210 #ifndef OLD_ARM_ABI
3211 case R_ARM_CALL:
3212 case R_ARM_JUMP24:
3213 case R_ARM_PREL31:
3214 #endif
3215 case R_ARM_ABS32:
3216 case R_ARM_THM_PC22:
3217 case R_ARM_PLT32:
3218
3219 if (info->shared
3220 && ((!info->symbolic && h->dynindx != -1)
3221 || !h->def_regular)
3222 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3223 && ((input_section->flags & SEC_ALLOC) != 0
3224 /* DWARF will emit R_ARM_ABS32 relocations in its
3225 sections against symbols defined externally
3226 in shared libraries. We can't do anything
3227 with them here. */
3228 || ((input_section->flags & SEC_DEBUGGING) != 0
3229 && h->def_dynamic))
3230 )
3231 relocation = 0;
3232 break;
3233
3234 case R_ARM_GOTPC:
3235 relocation = 0;
3236 break;
3237
3238 case R_ARM_GOT32:
3239 #ifndef OLD_ARM_ABI
3240 case R_ARM_GOT_PREL:
3241 #endif
3242 if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL
3243 (elf_hash_table (info)->dynamic_sections_created,
3244 info->shared, h))
3245 && (!info->shared
3246 || (!info->symbolic && h->dynindx != -1)
3247 || !h->def_regular))
3248 relocation = 0;
3249 break;
3250
3251 default:
3252 if (unresolved_reloc)
3253 _bfd_error_handler
3254 (_("%B(%A): warning: unresolvable relocation %d against symbol `%s'"),
3255 input_bfd, input_section,
3256 r_type,
3257 h->root.root.string);
3258 break;
3259 }
3260 }
3261 }
3262
3263 if (h != NULL)
3264 name = h->root.root.string;
3265 else
3266 {
3267 name = (bfd_elf_string_from_elf_section
3268 (input_bfd, symtab_hdr->sh_link, sym->st_name));
3269 if (name == NULL || *name == '\0')
3270 name = bfd_section_name (input_bfd, sec);
3271 }
3272
3273 r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
3274 input_section, contents, rel,
3275 relocation, info, sec, name,
3276 (h ? ELF_ST_TYPE (h->type) :
3277 ELF_ST_TYPE (sym->st_info)), h);
3278
3279 if (r != bfd_reloc_ok)
3280 {
3281 const char * msg = (const char *) 0;
3282
3283 switch (r)
3284 {
3285 case bfd_reloc_overflow:
3286 /* If the overflowing reloc was to an undefined symbol,
3287 we have already printed one error message and there
3288 is no point complaining again. */
3289 if ((! h ||
3290 h->root.type != bfd_link_hash_undefined)
3291 && (!((*info->callbacks->reloc_overflow)
3292 (info, (h ? &h->root : NULL), name, howto->name,
3293 (bfd_vma) 0, input_bfd, input_section,
3294 rel->r_offset))))
3295 return FALSE;
3296 break;
3297
3298 case bfd_reloc_undefined:
3299 if (!((*info->callbacks->undefined_symbol)
3300 (info, name, input_bfd, input_section,
3301 rel->r_offset, TRUE)))
3302 return FALSE;
3303 break;
3304
3305 case bfd_reloc_outofrange:
3306 msg = _("internal error: out of range error");
3307 goto common_error;
3308
3309 case bfd_reloc_notsupported:
3310 msg = _("internal error: unsupported relocation error");
3311 goto common_error;
3312
3313 case bfd_reloc_dangerous:
3314 msg = _("internal error: dangerous error");
3315 goto common_error;
3316
3317 default:
3318 msg = _("internal error: unknown error");
3319 /* fall through */
3320
3321 common_error:
3322 if (!((*info->callbacks->warning)
3323 (info, msg, name, input_bfd, input_section,
3324 rel->r_offset)))
3325 return FALSE;
3326 break;
3327 }
3328 }
3329 }
3330
3331 return TRUE;
3332 }
3333
3334 /* Set the right machine number. */
3335
3336 static bfd_boolean
3337 elf32_arm_object_p (bfd *abfd)
3338 {
3339 unsigned int mach;
3340
3341 mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION);
3342
3343 if (mach != bfd_mach_arm_unknown)
3344 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3345
3346 else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT)
3347 bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312);
3348
3349 else
3350 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3351
3352 return TRUE;
3353 }
3354
3355 /* Function to keep ARM specific flags in the ELF header. */
3356
3357 static bfd_boolean
3358 elf32_arm_set_private_flags (bfd *abfd, flagword flags)
3359 {
3360 if (elf_flags_init (abfd)
3361 && elf_elfheader (abfd)->e_flags != flags)
3362 {
3363 if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN)
3364 {
3365 if (flags & EF_ARM_INTERWORK)
3366 (*_bfd_error_handler)
3367 (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
3368 abfd);
3369 else
3370 _bfd_error_handler
3371 (_("Warning: Clearing the interworking flag of %B due to outside request"),
3372 abfd);
3373 }
3374 }
3375 else
3376 {
3377 elf_elfheader (abfd)->e_flags = flags;
3378 elf_flags_init (abfd) = TRUE;
3379 }
3380
3381 return TRUE;
3382 }
3383
3384 /* Copy backend specific data from one object module to another. */
3385
3386 static bfd_boolean
3387 elf32_arm_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
3388 {
3389 flagword in_flags;
3390 flagword out_flags;
3391
3392 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3393 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3394 return TRUE;
3395
3396 in_flags = elf_elfheader (ibfd)->e_flags;
3397 out_flags = elf_elfheader (obfd)->e_flags;
3398
3399 if (elf_flags_init (obfd)
3400 && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN
3401 && in_flags != out_flags)
3402 {
3403 /* Cannot mix APCS26 and APCS32 code. */
3404 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3405 return FALSE;
3406
3407 /* Cannot mix float APCS and non-float APCS code. */
3408 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3409 return FALSE;
3410
3411 /* If the src and dest have different interworking flags
3412 then turn off the interworking bit. */
3413 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3414 {
3415 if (out_flags & EF_ARM_INTERWORK)
3416 _bfd_error_handler
3417 (_("Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
3418 obfd, ibfd);
3419
3420 in_flags &= ~EF_ARM_INTERWORK;
3421 }
3422
3423 /* Likewise for PIC, though don't warn for this case. */
3424 if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC))
3425 in_flags &= ~EF_ARM_PIC;
3426 }
3427
3428 elf_elfheader (obfd)->e_flags = in_flags;
3429 elf_flags_init (obfd) = TRUE;
3430
3431 /* Also copy the EI_OSABI field. */
3432 elf_elfheader (obfd)->e_ident[EI_OSABI] =
3433 elf_elfheader (ibfd)->e_ident[EI_OSABI];
3434
3435 return TRUE;
3436 }
3437
3438 /* Merge backend specific data from an object file to the output
3439 object file when linking. */
3440
3441 static bfd_boolean
3442 elf32_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
3443 {
3444 flagword out_flags;
3445 flagword in_flags;
3446 bfd_boolean flags_compatible = TRUE;
3447 asection *sec;
3448
3449 /* Check if we have the same endianess. */
3450 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
3451 return FALSE;
3452
3453 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3454 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3455 return TRUE;
3456
3457 /* The input BFD must have had its flags initialised. */
3458 /* The following seems bogus to me -- The flags are initialized in
3459 the assembler but I don't think an elf_flags_init field is
3460 written into the object. */
3461 /* BFD_ASSERT (elf_flags_init (ibfd)); */
3462
3463 in_flags = elf_elfheader (ibfd)->e_flags;
3464 out_flags = elf_elfheader (obfd)->e_flags;
3465
3466 if (!elf_flags_init (obfd))
3467 {
3468 /* If the input is the default architecture and had the default
3469 flags then do not bother setting the flags for the output
3470 architecture, instead allow future merges to do this. If no
3471 future merges ever set these flags then they will retain their
3472 uninitialised values, which surprise surprise, correspond
3473 to the default values. */
3474 if (bfd_get_arch_info (ibfd)->the_default
3475 && elf_elfheader (ibfd)->e_flags == 0)
3476 return TRUE;
3477
3478 elf_flags_init (obfd) = TRUE;
3479 elf_elfheader (obfd)->e_flags = in_flags;
3480
3481 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
3482 && bfd_get_arch_info (obfd)->the_default)
3483 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
3484
3485 return TRUE;
3486 }
3487
3488 /* Determine what should happen if the input ARM architecture
3489 does not match the output ARM architecture. */
3490 if (! bfd_arm_merge_machines (ibfd, obfd))
3491 return FALSE;
3492
3493 /* Identical flags must be compatible. */
3494 if (in_flags == out_flags)
3495 return TRUE;
3496
3497 /* Check to see if the input BFD actually contains any sections. If
3498 not, its flags may not have been initialised either, but it
3499 cannot actually cause any incompatibility. Do not short-circuit
3500 dynamic objects; their section list may be emptied by
3501 elf_link_add_object_symbols.
3502
3503 Also check to see if there are no code sections in the input.
3504 In this case there is no need to check for code specific flags.
3505 XXX - do we need to worry about floating-point format compatability
3506 in data sections ? */
3507 if (!(ibfd->flags & DYNAMIC))
3508 {
3509 bfd_boolean null_input_bfd = TRUE;
3510 bfd_boolean only_data_sections = TRUE;
3511
3512 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
3513 {
3514 /* Ignore synthetic glue sections. */
3515 if (strcmp (sec->name, ".glue_7")
3516 && strcmp (sec->name, ".glue_7t"))
3517 {
3518 if ((bfd_get_section_flags (ibfd, sec)
3519 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3520 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3521 only_data_sections = FALSE;
3522
3523 null_input_bfd = FALSE;
3524 break;
3525 }
3526 }
3527
3528 if (null_input_bfd || only_data_sections)
3529 return TRUE;
3530 }
3531
3532 /* Complain about various flag mismatches. */
3533 if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags))
3534 {
3535 _bfd_error_handler
3536 (_("ERROR: Source object %B has EABI version %d, but target %B has EABI version %d"),
3537 ibfd, obfd,
3538 (in_flags & EF_ARM_EABIMASK) >> 24,
3539 (out_flags & EF_ARM_EABIMASK) >> 24);
3540 return FALSE;
3541 }
3542
3543 /* Not sure what needs to be checked for EABI versions >= 1. */
3544 if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN)
3545 {
3546 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3547 {
3548 _bfd_error_handler
3549 (_("ERROR: %B is compiled for APCS-%d, whereas target %B uses APCS-%d"),
3550 ibfd, obfd,
3551 in_flags & EF_ARM_APCS_26 ? 26 : 32,
3552 out_flags & EF_ARM_APCS_26 ? 26 : 32);
3553 flags_compatible = FALSE;
3554 }
3555
3556 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3557 {
3558 if (in_flags & EF_ARM_APCS_FLOAT)
3559 _bfd_error_handler
3560 (_("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers"),
3561 ibfd, obfd);
3562 else
3563 _bfd_error_handler
3564 (_("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers"),
3565 ibfd, obfd);
3566
3567 flags_compatible = FALSE;
3568 }
3569
3570 if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT))
3571 {
3572 if (in_flags & EF_ARM_VFP_FLOAT)
3573 _bfd_error_handler
3574 (_("ERROR: %B uses VFP instructions, whereas %B does not"),
3575 ibfd, obfd);
3576 else
3577 _bfd_error_handler
3578 (_("ERROR: %B uses FPA instructions, whereas %B does not"),
3579 ibfd, obfd);
3580
3581 flags_compatible = FALSE;
3582 }
3583
3584 if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT))
3585 {
3586 if (in_flags & EF_ARM_MAVERICK_FLOAT)
3587 _bfd_error_handler
3588 (_("ERROR: %B uses Maverick instructions, whereas %B does not"),
3589 ibfd, obfd);
3590 else
3591 _bfd_error_handler
3592 (_("ERROR: %B does not use Maverick instructions, whereas %B does"),
3593 ibfd, obfd);
3594
3595 flags_compatible = FALSE;
3596 }
3597
3598 #ifdef EF_ARM_SOFT_FLOAT
3599 if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT))
3600 {
3601 /* We can allow interworking between code that is VFP format
3602 layout, and uses either soft float or integer regs for
3603 passing floating point arguments and results. We already
3604 know that the APCS_FLOAT flags match; similarly for VFP
3605 flags. */
3606 if ((in_flags & EF_ARM_APCS_FLOAT) != 0
3607 || (in_flags & EF_ARM_VFP_FLOAT) == 0)
3608 {
3609 if (in_flags & EF_ARM_SOFT_FLOAT)
3610 _bfd_error_handler
3611 (_("ERROR: %B uses software FP, whereas %B uses hardware FP"),
3612 ibfd, obfd);
3613 else
3614 _bfd_error_handler
3615 (_("ERROR: %B uses hardware FP, whereas %B uses software FP"),
3616 ibfd, obfd);
3617
3618 flags_compatible = FALSE;
3619 }
3620 }
3621 #endif
3622
3623 /* Interworking mismatch is only a warning. */
3624 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3625 {
3626 if (in_flags & EF_ARM_INTERWORK)
3627 {
3628 _bfd_error_handler
3629 (_("Warning: %B supports interworking, whereas %B does not"),
3630 ibfd, obfd);
3631 }
3632 else
3633 {
3634 _bfd_error_handler
3635 (_("Warning: %B does not support interworking, whereas %B does"),
3636 ibfd, obfd);
3637 }
3638 }
3639 }
3640
3641 return flags_compatible;
3642 }
3643
3644 /* Display the flags field. */
3645
3646 static bfd_boolean
3647 elf32_arm_print_private_bfd_data (bfd *abfd, void * ptr)
3648 {
3649 FILE * file = (FILE *) ptr;
3650 unsigned long flags;
3651
3652 BFD_ASSERT (abfd != NULL && ptr != NULL);
3653
3654 /* Print normal ELF private data. */
3655 _bfd_elf_print_private_bfd_data (abfd, ptr);
3656
3657 flags = elf_elfheader (abfd)->e_flags;
3658 /* Ignore init flag - it may not be set, despite the flags field
3659 containing valid data. */
3660
3661 /* xgettext:c-format */
3662 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
3663
3664 switch (EF_ARM_EABI_VERSION (flags))
3665 {
3666 case EF_ARM_EABI_UNKNOWN:
3667 /* The following flag bits are GNU extensions and not part of the
3668 official ARM ELF extended ABI. Hence they are only decoded if
3669 the EABI version is not set. */
3670 if (flags & EF_ARM_INTERWORK)
3671 fprintf (file, _(" [interworking enabled]"));
3672
3673 if (flags & EF_ARM_APCS_26)
3674 fprintf (file, " [APCS-26]");
3675 else
3676 fprintf (file, " [APCS-32]");
3677
3678 if (flags & EF_ARM_VFP_FLOAT)
3679 fprintf (file, _(" [VFP float format]"));
3680 else if (flags & EF_ARM_MAVERICK_FLOAT)
3681 fprintf (file, _(" [Maverick float format]"));
3682 else
3683 fprintf (file, _(" [FPA float format]"));
3684
3685 if (flags & EF_ARM_APCS_FLOAT)
3686 fprintf (file, _(" [floats passed in float registers]"));
3687
3688 if (flags & EF_ARM_PIC)
3689 fprintf (file, _(" [position independent]"));
3690
3691 if (flags & EF_ARM_NEW_ABI)
3692 fprintf (file, _(" [new ABI]"));
3693
3694 if (flags & EF_ARM_OLD_ABI)
3695 fprintf (file, _(" [old ABI]"));
3696
3697 if (flags & EF_ARM_SOFT_FLOAT)
3698 fprintf (file, _(" [software FP]"));
3699
3700 flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT
3701 | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI
3702 | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT
3703 | EF_ARM_MAVERICK_FLOAT);
3704 break;
3705
3706 case EF_ARM_EABI_VER1:
3707 fprintf (file, _(" [Version1 EABI]"));
3708
3709 if (flags & EF_ARM_SYMSARESORTED)
3710 fprintf (file, _(" [sorted symbol table]"));
3711 else
3712 fprintf (file, _(" [unsorted symbol table]"));
3713
3714 flags &= ~ EF_ARM_SYMSARESORTED;
3715 break;
3716
3717 case EF_ARM_EABI_VER2:
3718 fprintf (file, _(" [Version2 EABI]"));
3719
3720 if (flags & EF_ARM_SYMSARESORTED)
3721 fprintf (file, _(" [sorted symbol table]"));
3722 else
3723 fprintf (file, _(" [unsorted symbol table]"));
3724
3725 if (flags & EF_ARM_DYNSYMSUSESEGIDX)
3726 fprintf (file, _(" [dynamic symbols use segment index]"));
3727
3728 if (flags & EF_ARM_MAPSYMSFIRST)
3729 fprintf (file, _(" [mapping symbols precede others]"));
3730
3731 flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX
3732 | EF_ARM_MAPSYMSFIRST);
3733 break;
3734
3735 case EF_ARM_EABI_VER3:
3736 fprintf (file, _(" [Version3 EABI]"));
3737 break;
3738
3739 case EF_ARM_EABI_VER4:
3740 fprintf (file, _(" [Version4 EABI]"));
3741
3742 if (flags & EF_ARM_BE8)
3743 fprintf (file, _(" [BE8]"));
3744
3745 if (flags & EF_ARM_LE8)
3746 fprintf (file, _(" [LE8]"));
3747
3748 flags &= ~(EF_ARM_LE8 | EF_ARM_BE8);
3749 break;
3750
3751 default:
3752 fprintf (file, _(" <EABI version unrecognised>"));
3753 break;
3754 }
3755
3756 flags &= ~ EF_ARM_EABIMASK;
3757
3758 if (flags & EF_ARM_RELEXEC)
3759 fprintf (file, _(" [relocatable executable]"));
3760
3761 if (flags & EF_ARM_HASENTRY)
3762 fprintf (file, _(" [has entry point]"));
3763
3764 flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY);
3765
3766 if (flags)
3767 fprintf (file, _("<Unrecognised flag bits set>"));
3768
3769 fputc ('\n', file);
3770
3771 return TRUE;
3772 }
3773
3774 static int
3775 elf32_arm_get_symbol_type (Elf_Internal_Sym * elf_sym, int type)
3776 {
3777 switch (ELF_ST_TYPE (elf_sym->st_info))
3778 {
3779 case STT_ARM_TFUNC:
3780 return ELF_ST_TYPE (elf_sym->st_info);
3781
3782 case STT_ARM_16BIT:
3783 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
3784 This allows us to distinguish between data used by Thumb instructions
3785 and non-data (which is probably code) inside Thumb regions of an
3786 executable. */
3787 if (type != STT_OBJECT)
3788 return ELF_ST_TYPE (elf_sym->st_info);
3789 break;
3790
3791 default:
3792 break;
3793 }
3794
3795 return type;
3796 }
3797
3798 static asection *
3799 elf32_arm_gc_mark_hook (asection * sec,
3800 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3801 Elf_Internal_Rela * rel,
3802 struct elf_link_hash_entry * h,
3803 Elf_Internal_Sym * sym)
3804 {
3805 if (h != NULL)
3806 {
3807 switch (ELF32_R_TYPE (rel->r_info))
3808 {
3809 case R_ARM_GNU_VTINHERIT:
3810 case R_ARM_GNU_VTENTRY:
3811 break;
3812
3813 default:
3814 switch (h->root.type)
3815 {
3816 case bfd_link_hash_defined:
3817 case bfd_link_hash_defweak:
3818 return h->root.u.def.section;
3819
3820 case bfd_link_hash_common:
3821 return h->root.u.c.p->section;
3822
3823 default:
3824 break;
3825 }
3826 }
3827 }
3828 else
3829 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
3830
3831 return NULL;
3832 }
3833
3834 /* Update the got entry reference counts for the section being removed. */
3835
3836 static bfd_boolean
3837 elf32_arm_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
3838 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3839 asection * sec ATTRIBUTE_UNUSED,
3840 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
3841 {
3842 Elf_Internal_Shdr *symtab_hdr;
3843 struct elf_link_hash_entry **sym_hashes;
3844 bfd_signed_vma *local_got_refcounts;
3845 const Elf_Internal_Rela *rel, *relend;
3846 unsigned long r_symndx;
3847 struct elf_link_hash_entry *h;
3848 struct elf32_arm_link_hash_table * globals;
3849
3850 globals = elf32_arm_hash_table (info);
3851
3852 elf_section_data (sec)->local_dynrel = NULL;
3853
3854 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3855 sym_hashes = elf_sym_hashes (abfd);
3856 local_got_refcounts = elf_local_got_refcounts (abfd);
3857
3858 relend = relocs + sec->reloc_count;
3859 for (rel = relocs; rel < relend; rel++)
3860 {
3861 int r_type;
3862
3863 r_type = ELF32_R_TYPE (rel->r_info);
3864 #ifndef OLD_ARM_ABI
3865 r_type = arm_real_reloc_type (globals, r_type);
3866 #endif
3867 switch (r_type)
3868 {
3869 case R_ARM_GOT32:
3870 #ifndef OLD_ARM_ABI
3871 case R_ARM_GOT_PREL:
3872 #endif
3873 r_symndx = ELF32_R_SYM (rel->r_info);
3874 if (r_symndx >= symtab_hdr->sh_info)
3875 {
3876 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3877 if (h->got.refcount > 0)
3878 h->got.refcount -= 1;
3879 }
3880 else if (local_got_refcounts != NULL)
3881 {
3882 if (local_got_refcounts[r_symndx] > 0)
3883 local_got_refcounts[r_symndx] -= 1;
3884 }
3885 break;
3886
3887 case R_ARM_ABS32:
3888 case R_ARM_REL32:
3889 case R_ARM_PC24:
3890 case R_ARM_PLT32:
3891 #ifndef OLD_ARM_ABI
3892 case R_ARM_CALL:
3893 case R_ARM_JUMP24:
3894 case R_ARM_PREL31:
3895 #endif
3896 case R_ARM_THM_PC22:
3897 /* Should the interworking branches be here also? */
3898
3899 r_symndx = ELF32_R_SYM (rel->r_info);
3900 if (r_symndx >= symtab_hdr->sh_info)
3901 {
3902 struct elf32_arm_link_hash_entry *eh;
3903 struct elf32_arm_relocs_copied **pp;
3904 struct elf32_arm_relocs_copied *p;
3905
3906 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3907 eh = (struct elf32_arm_link_hash_entry *) h;
3908
3909 if (h->plt.refcount > 0)
3910 {
3911 h->plt.refcount -= 1;
3912 if (ELF32_R_TYPE (rel->r_info) == R_ARM_THM_PC22)
3913 eh->plt_thumb_refcount--;
3914 }
3915
3916 if (r_type == R_ARM_ABS32
3917 || r_type == R_ARM_REL32)
3918 {
3919 for (pp = &eh->relocs_copied; (p = *pp) != NULL;
3920 pp = &p->next)
3921 if (p->section == sec)
3922 {
3923 p->count -= 1;
3924 if (p->count == 0)
3925 *pp = p->next;
3926 break;
3927 }
3928 }
3929 }
3930 break;
3931
3932 default:
3933 break;
3934 }
3935 }
3936
3937 return TRUE;
3938 }
3939
3940 /* Look through the relocs for a section during the first phase. */
3941
3942 static bfd_boolean
3943 elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
3944 asection *sec, const Elf_Internal_Rela *relocs)
3945 {
3946 Elf_Internal_Shdr *symtab_hdr;
3947 struct elf_link_hash_entry **sym_hashes;
3948 struct elf_link_hash_entry **sym_hashes_end;
3949 const Elf_Internal_Rela *rel;
3950 const Elf_Internal_Rela *rel_end;
3951 bfd *dynobj;
3952 asection *sreloc;
3953 bfd_vma *local_got_offsets;
3954 struct elf32_arm_link_hash_table *htab;
3955
3956 if (info->relocatable)
3957 return TRUE;
3958
3959 htab = elf32_arm_hash_table (info);
3960 sreloc = NULL;
3961
3962 dynobj = elf_hash_table (info)->dynobj;
3963 local_got_offsets = elf_local_got_offsets (abfd);
3964
3965 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3966 sym_hashes = elf_sym_hashes (abfd);
3967 sym_hashes_end = sym_hashes
3968 + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
3969
3970 if (!elf_bad_symtab (abfd))
3971 sym_hashes_end -= symtab_hdr->sh_info;
3972
3973 rel_end = relocs + sec->reloc_count;
3974 for (rel = relocs; rel < rel_end; rel++)
3975 {
3976 struct elf_link_hash_entry *h;
3977 struct elf32_arm_link_hash_entry *eh;
3978 unsigned long r_symndx;
3979 int r_type;
3980
3981 r_symndx = ELF32_R_SYM (rel->r_info);
3982 r_type = ELF32_R_TYPE (rel->r_info);
3983 #ifndef OLD_ARM_ABI
3984 r_type = arm_real_reloc_type (htab, r_type);
3985 #endif
3986 if (r_symndx < symtab_hdr->sh_info)
3987 h = NULL;
3988 else
3989 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3990
3991 eh = (struct elf32_arm_link_hash_entry *) h;
3992
3993 switch (r_type)
3994 {
3995 case R_ARM_GOT32:
3996 #ifndef OLD_ARM_ABI
3997 case R_ARM_GOT_PREL:
3998 #endif
3999 /* This symbol requires a global offset table entry. */
4000 if (h != NULL)
4001 {
4002 h->got.refcount++;
4003 }
4004 else
4005 {
4006 bfd_signed_vma *local_got_refcounts;
4007
4008 /* This is a global offset table entry for a local symbol. */
4009 local_got_refcounts = elf_local_got_refcounts (abfd);
4010 if (local_got_refcounts == NULL)
4011 {
4012 bfd_size_type size;
4013
4014 size = symtab_hdr->sh_info;
4015 size *= (sizeof (bfd_signed_vma) + sizeof (char));
4016 local_got_refcounts = bfd_zalloc (abfd, size);
4017 if (local_got_refcounts == NULL)
4018 return FALSE;
4019 elf_local_got_refcounts (abfd) = local_got_refcounts;
4020 }
4021 local_got_refcounts[r_symndx] += 1;
4022 }
4023 if (r_type == R_ARM_GOT32)
4024 break;
4025 /* Fall through. */
4026
4027 case R_ARM_GOTOFF:
4028 case R_ARM_GOTPC:
4029 if (htab->sgot == NULL)
4030 {
4031 if (htab->root.dynobj == NULL)
4032 htab->root.dynobj = abfd;
4033 if (!create_got_section (htab->root.dynobj, info))
4034 return FALSE;
4035 }
4036 break;
4037
4038 case R_ARM_ABS32:
4039 case R_ARM_REL32:
4040 case R_ARM_PC24:
4041 case R_ARM_PLT32:
4042 #ifndef OLD_ARM_ABI
4043 case R_ARM_CALL:
4044 case R_ARM_JUMP24:
4045 case R_ARM_PREL31:
4046 #endif
4047 case R_ARM_THM_PC22:
4048 /* Should the interworking branches be listed here? */
4049 if (h != NULL)
4050 {
4051 /* If this reloc is in a read-only section, we might
4052 need a copy reloc. We can't check reliably at this
4053 stage whether the section is read-only, as input
4054 sections have not yet been mapped to output sections.
4055 Tentatively set the flag for now, and correct in
4056 adjust_dynamic_symbol. */
4057 if (!info->shared)
4058 h->non_got_ref = 1;
4059
4060 /* We may need a .plt entry if the function this reloc
4061 refers to is in a different object. We can't tell for
4062 sure yet, because something later might force the
4063 symbol local. */
4064 if (r_type == R_ARM_PC24
4065 #ifndef OLD_ARM_ABI
4066 || r_type == R_ARM_CALL
4067 || r_type == R_ARM_JUMP24
4068 || r_type == R_ARM_PREL31
4069 #endif
4070 || r_type == R_ARM_PLT32
4071 || r_type == R_ARM_THM_PC22)
4072 h->needs_plt = 1;
4073
4074 /* If we create a PLT entry, this relocation will reference
4075 it, even if it's an ABS32 relocation. */
4076 h->plt.refcount += 1;
4077
4078 if (r_type == R_ARM_THM_PC22)
4079 eh->plt_thumb_refcount += 1;
4080 }
4081
4082 /* If we are creating a shared library, and this is a reloc
4083 against a global symbol, or a non PC relative reloc
4084 against a local symbol, then we need to copy the reloc
4085 into the shared library. However, if we are linking with
4086 -Bsymbolic, we do not need to copy a reloc against a
4087 global symbol which is defined in an object we are
4088 including in the link (i.e., DEF_REGULAR is set). At
4089 this point we have not seen all the input files, so it is
4090 possible that DEF_REGULAR is not set now but will be set
4091 later (it is never cleared). We account for that
4092 possibility below by storing information in the
4093 relocs_copied field of the hash table entry. */
4094 if (info->shared
4095 && (sec->flags & SEC_ALLOC) != 0
4096 && ((r_type != R_ARM_PC24
4097 && r_type != R_ARM_PLT32
4098 #ifndef OLD_ARM_ABI
4099 && r_type != R_ARM_CALL
4100 && r_type != R_ARM_JUMP24
4101 && r_type != R_ARM_PREL31
4102 #endif
4103 && r_type != R_ARM_REL32
4104 && r_type != R_ARM_THM_PC22)
4105 || (h != NULL
4106 && (! info->symbolic
4107 || !h->def_regular))))
4108 {
4109 struct elf32_arm_relocs_copied *p, **head;
4110
4111 /* When creating a shared object, we must copy these
4112 reloc types into the output file. We create a reloc
4113 section in dynobj and make room for this reloc. */
4114 if (sreloc == NULL)
4115 {
4116 const char * name;
4117
4118 name = (bfd_elf_string_from_elf_section
4119 (abfd,
4120 elf_elfheader (abfd)->e_shstrndx,
4121 elf_section_data (sec)->rel_hdr.sh_name));
4122 if (name == NULL)
4123 return FALSE;
4124
4125 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
4126 && strcmp (bfd_get_section_name (abfd, sec),
4127 name + 4) == 0);
4128
4129 sreloc = bfd_get_section_by_name (dynobj, name);
4130 if (sreloc == NULL)
4131 {
4132 flagword flags;
4133
4134 sreloc = bfd_make_section (dynobj, name);
4135 flags = (SEC_HAS_CONTENTS | SEC_READONLY
4136 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
4137 if ((sec->flags & SEC_ALLOC) != 0
4138 /* BPABI objects never have dynamic
4139 relocations mapped. */
4140 && !htab->symbian_p)
4141 flags |= SEC_ALLOC | SEC_LOAD;
4142 if (sreloc == NULL
4143 || ! bfd_set_section_flags (dynobj, sreloc, flags)
4144 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
4145 return FALSE;
4146 }
4147
4148 elf_section_data (sec)->sreloc = sreloc;
4149 }
4150
4151 /* If this is a global symbol, we count the number of
4152 relocations we need for this symbol. */
4153 if (h != NULL)
4154 {
4155 head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied;
4156 }
4157 else
4158 {
4159 /* Track dynamic relocs needed for local syms too.
4160 We really need local syms available to do this
4161 easily. Oh well. */
4162
4163 asection *s;
4164 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
4165 sec, r_symndx);
4166 if (s == NULL)
4167 return FALSE;
4168
4169 head = ((struct elf32_arm_relocs_copied **)
4170 &elf_section_data (s)->local_dynrel);
4171 }
4172
4173 p = *head;
4174 if (p == NULL || p->section != sec)
4175 {
4176 bfd_size_type amt = sizeof *p;
4177
4178 p = bfd_alloc (htab->root.dynobj, amt);
4179 if (p == NULL)
4180 return FALSE;
4181 p->next = *head;
4182 *head = p;
4183 p->section = sec;
4184 p->count = 0;
4185 }
4186
4187 if (r_type == R_ARM_ABS32
4188 || r_type == R_ARM_REL32)
4189 p->count += 1;
4190 }
4191 break;
4192
4193 /* This relocation describes the C++ object vtable hierarchy.
4194 Reconstruct it for later use during GC. */
4195 case R_ARM_GNU_VTINHERIT:
4196 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4197 return FALSE;
4198 break;
4199
4200 /* This relocation describes which C++ vtable entries are actually
4201 used. Record for later use during GC. */
4202 case R_ARM_GNU_VTENTRY:
4203 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
4204 return FALSE;
4205 break;
4206 }
4207 }
4208
4209 return TRUE;
4210 }
4211
4212 static bfd_boolean
4213 is_arm_mapping_symbol_name (const char * name)
4214 {
4215 return (name != NULL)
4216 && (name[0] == '$')
4217 && ((name[1] == 'a') || (name[1] == 't') || (name[1] == 'd'))
4218 && (name[2] == 0);
4219 }
4220
4221 /* Treat mapping symbols as special target symbols. */
4222
4223 static bfd_boolean
4224 elf32_arm_is_target_special_symbol (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym)
4225 {
4226 return is_arm_mapping_symbol_name (sym->name);
4227 }
4228
4229 /* This is a copy of elf_find_function() from elf.c except that
4230 ARM mapping symbols are ignored when looking for function names
4231 and STT_ARM_TFUNC is considered to a function type. */
4232
4233 static bfd_boolean
4234 arm_elf_find_function (bfd * abfd ATTRIBUTE_UNUSED,
4235 asection * section,
4236 asymbol ** symbols,
4237 bfd_vma offset,
4238 const char ** filename_ptr,
4239 const char ** functionname_ptr)
4240 {
4241 const char * filename = NULL;
4242 asymbol * func = NULL;
4243 bfd_vma low_func = 0;
4244 asymbol ** p;
4245
4246 for (p = symbols; *p != NULL; p++)
4247 {
4248 elf_symbol_type *q;
4249
4250 q = (elf_symbol_type *) *p;
4251
4252 switch (ELF_ST_TYPE (q->internal_elf_sym.st_info))
4253 {
4254 default:
4255 break;
4256 case STT_FILE:
4257 filename = bfd_asymbol_name (&q->symbol);
4258 break;
4259 case STT_FUNC:
4260 case STT_ARM_TFUNC:
4261 /* Skip $a and $t symbols. */
4262 if ((q->symbol.flags & BSF_LOCAL)
4263 && is_arm_mapping_symbol_name (q->symbol.name))
4264 continue;
4265 /* Fall through. */
4266 case STT_NOTYPE:
4267 if (bfd_get_section (&q->symbol) == section
4268 && q->symbol.value >= low_func
4269 && q->symbol.value <= offset)
4270 {
4271 func = (asymbol *) q;
4272 low_func = q->symbol.value;
4273 }
4274 break;
4275 }
4276 }
4277
4278 if (func == NULL)
4279 return FALSE;
4280
4281 if (filename_ptr)
4282 *filename_ptr = filename;
4283 if (functionname_ptr)
4284 *functionname_ptr = bfd_asymbol_name (func);
4285
4286 return TRUE;
4287 }
4288
4289
4290 /* Find the nearest line to a particular section and offset, for error
4291 reporting. This code is a duplicate of the code in elf.c, except
4292 that it uses arm_elf_find_function. */
4293
4294 static bfd_boolean
4295 elf32_arm_find_nearest_line (bfd * abfd,
4296 asection * section,
4297 asymbol ** symbols,
4298 bfd_vma offset,
4299 const char ** filename_ptr,
4300 const char ** functionname_ptr,
4301 unsigned int * line_ptr)
4302 {
4303 bfd_boolean found = FALSE;
4304
4305 /* We skip _bfd_dwarf1_find_nearest_line since no known ARM toolchain uses it. */
4306
4307 if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
4308 filename_ptr, functionname_ptr,
4309 line_ptr, 0,
4310 & elf_tdata (abfd)->dwarf2_find_line_info))
4311 {
4312 if (!*functionname_ptr)
4313 arm_elf_find_function (abfd, section, symbols, offset,
4314 *filename_ptr ? NULL : filename_ptr,
4315 functionname_ptr);
4316
4317 return TRUE;
4318 }
4319
4320 if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset,
4321 & found, filename_ptr,
4322 functionname_ptr, line_ptr,
4323 & elf_tdata (abfd)->line_info))
4324 return FALSE;
4325
4326 if (found && (*functionname_ptr || *line_ptr))
4327 return TRUE;
4328
4329 if (symbols == NULL)
4330 return FALSE;
4331
4332 if (! arm_elf_find_function (abfd, section, symbols, offset,
4333 filename_ptr, functionname_ptr))
4334 return FALSE;
4335
4336 *line_ptr = 0;
4337 return TRUE;
4338 }
4339
4340 /* Adjust a symbol defined by a dynamic object and referenced by a
4341 regular object. The current definition is in some section of the
4342 dynamic object, but we're not including those sections. We have to
4343 change the definition to something the rest of the link can
4344 understand. */
4345
4346 static bfd_boolean
4347 elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info,
4348 struct elf_link_hash_entry * h)
4349 {
4350 bfd * dynobj;
4351 asection * s;
4352 unsigned int power_of_two;
4353 struct elf32_arm_link_hash_entry * eh;
4354
4355 dynobj = elf_hash_table (info)->dynobj;
4356
4357 /* Make sure we know what is going on here. */
4358 BFD_ASSERT (dynobj != NULL
4359 && (h->needs_plt
4360 || h->u.weakdef != NULL
4361 || (h->def_dynamic
4362 && h->ref_regular
4363 && !h->def_regular)));
4364
4365 eh = (struct elf32_arm_link_hash_entry *) h;
4366
4367 /* If this is a function, put it in the procedure linkage table. We
4368 will fill in the contents of the procedure linkage table later,
4369 when we know the address of the .got section. */
4370 if (h->type == STT_FUNC || h->type == STT_ARM_TFUNC
4371 || h->needs_plt)
4372 {
4373 if (h->plt.refcount <= 0
4374 || SYMBOL_CALLS_LOCAL (info, h)
4375 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4376 && h->root.type == bfd_link_hash_undefweak))
4377 {
4378 /* This case can occur if we saw a PLT32 reloc in an input
4379 file, but the symbol was never referred to by a dynamic
4380 object, or if all references were garbage collected. In
4381 such a case, we don't actually need to build a procedure
4382 linkage table, and we can just do a PC24 reloc instead. */
4383 h->plt.offset = (bfd_vma) -1;
4384 eh->plt_thumb_refcount = 0;
4385 h->needs_plt = 0;
4386 }
4387
4388 return TRUE;
4389 }
4390 else
4391 {
4392 /* It's possible that we incorrectly decided a .plt reloc was
4393 needed for an R_ARM_PC24 or similar reloc to a non-function sym
4394 in check_relocs. We can't decide accurately between function
4395 and non-function syms in check-relocs; Objects loaded later in
4396 the link may change h->type. So fix it now. */
4397 h->plt.offset = (bfd_vma) -1;
4398 eh->plt_thumb_refcount = 0;
4399 }
4400
4401 /* If this is a weak symbol, and there is a real definition, the
4402 processor independent code will have arranged for us to see the
4403 real definition first, and we can just use the same value. */
4404 if (h->u.weakdef != NULL)
4405 {
4406 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
4407 || h->u.weakdef->root.type == bfd_link_hash_defweak);
4408 h->root.u.def.section = h->u.weakdef->root.u.def.section;
4409 h->root.u.def.value = h->u.weakdef->root.u.def.value;
4410 return TRUE;
4411 }
4412
4413 /* This is a reference to a symbol defined by a dynamic object which
4414 is not a function. */
4415
4416 /* If we are creating a shared library, we must presume that the
4417 only references to the symbol are via the global offset table.
4418 For such cases we need not do anything here; the relocations will
4419 be handled correctly by relocate_section. */
4420 if (info->shared)
4421 return TRUE;
4422
4423 /* We must allocate the symbol in our .dynbss section, which will
4424 become part of the .bss section of the executable. There will be
4425 an entry for this symbol in the .dynsym section. The dynamic
4426 object will contain position independent code, so all references
4427 from the dynamic object to this symbol will go through the global
4428 offset table. The dynamic linker will use the .dynsym entry to
4429 determine the address it must put in the global offset table, so
4430 both the dynamic object and the regular object will refer to the
4431 same memory location for the variable. */
4432 s = bfd_get_section_by_name (dynobj, ".dynbss");
4433 BFD_ASSERT (s != NULL);
4434
4435 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
4436 copy the initial value out of the dynamic object and into the
4437 runtime process image. We need to remember the offset into the
4438 .rel.bss section we are going to use. */
4439 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
4440 {
4441 asection *srel;
4442
4443 srel = bfd_get_section_by_name (dynobj, ".rel.bss");
4444 BFD_ASSERT (srel != NULL);
4445 srel->size += sizeof (Elf32_External_Rel);
4446 h->needs_copy = 1;
4447 }
4448
4449 /* We need to figure out the alignment required for this symbol. I
4450 have no idea how ELF linkers handle this. */
4451 power_of_two = bfd_log2 (h->size);
4452 if (power_of_two > 3)
4453 power_of_two = 3;
4454
4455 /* Apply the required alignment. */
4456 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
4457 if (power_of_two > bfd_get_section_alignment (dynobj, s))
4458 {
4459 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
4460 return FALSE;
4461 }
4462
4463 /* Define the symbol as being at this point in the section. */
4464 h->root.u.def.section = s;
4465 h->root.u.def.value = s->size;
4466
4467 /* Increment the section size to make room for the symbol. */
4468 s->size += h->size;
4469
4470 return TRUE;
4471 }
4472
4473 /* Allocate space in .plt, .got and associated reloc sections for
4474 dynamic relocs. */
4475
4476 static bfd_boolean
4477 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
4478 {
4479 struct bfd_link_info *info;
4480 struct elf32_arm_link_hash_table *htab;
4481 struct elf32_arm_link_hash_entry *eh;
4482 struct elf32_arm_relocs_copied *p;
4483
4484 eh = (struct elf32_arm_link_hash_entry *) h;
4485
4486 if (h->root.type == bfd_link_hash_indirect)
4487 return TRUE;
4488
4489 if (h->root.type == bfd_link_hash_warning)
4490 /* When warning symbols are created, they **replace** the "real"
4491 entry in the hash table, thus we never get to see the real
4492 symbol in a hash traversal. So look at it now. */
4493 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4494
4495 info = (struct bfd_link_info *) inf;
4496 htab = elf32_arm_hash_table (info);
4497
4498 if (htab->root.dynamic_sections_created
4499 && h->plt.refcount > 0)
4500 {
4501 /* Make sure this symbol is output as a dynamic symbol.
4502 Undefined weak syms won't yet be marked as dynamic. */
4503 if (h->dynindx == -1
4504 && !h->forced_local)
4505 {
4506 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4507 return FALSE;
4508 }
4509
4510 if (info->shared
4511 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
4512 {
4513 asection *s = htab->splt;
4514
4515 /* If this is the first .plt entry, make room for the special
4516 first entry. */
4517 if (s->size == 0)
4518 s->size += htab->plt_header_size;
4519
4520 h->plt.offset = s->size;
4521
4522 /* If we will insert a Thumb trampoline before this PLT, leave room
4523 for it. */
4524 if (!htab->symbian_p && eh->plt_thumb_refcount > 0)
4525 {
4526 h->plt.offset += PLT_THUMB_STUB_SIZE;
4527 s->size += PLT_THUMB_STUB_SIZE;
4528 }
4529
4530 /* If this symbol is not defined in a regular file, and we are
4531 not generating a shared library, then set the symbol to this
4532 location in the .plt. This is required to make function
4533 pointers compare as equal between the normal executable and
4534 the shared library. */
4535 if (! info->shared
4536 && !h->def_regular)
4537 {
4538 h->root.u.def.section = s;
4539 h->root.u.def.value = h->plt.offset;
4540
4541 /* Make sure the function is not marked as Thumb, in case
4542 it is the target of an ABS32 relocation, which will
4543 point to the PLT entry. */
4544 if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC)
4545 h->type = ELF_ST_INFO (ELF_ST_BIND (h->type), STT_FUNC);
4546 }
4547
4548 /* Make room for this entry. */
4549 s->size += htab->plt_entry_size;
4550
4551 if (!htab->symbian_p)
4552 {
4553 /* We also need to make an entry in the .got.plt section, which
4554 will be placed in the .got section by the linker script. */
4555 eh->plt_got_offset = htab->sgotplt->size;
4556 htab->sgotplt->size += 4;
4557 }
4558
4559 /* We also need to make an entry in the .rel.plt section. */
4560 htab->srelplt->size += sizeof (Elf32_External_Rel);
4561 }
4562 else
4563 {
4564 h->plt.offset = (bfd_vma) -1;
4565 h->needs_plt = 0;
4566 }
4567 }
4568 else
4569 {
4570 h->plt.offset = (bfd_vma) -1;
4571 h->needs_plt = 0;
4572 }
4573
4574 if (h->got.refcount > 0)
4575 {
4576 asection *s;
4577 bfd_boolean dyn;
4578
4579 /* Make sure this symbol is output as a dynamic symbol.
4580 Undefined weak syms won't yet be marked as dynamic. */
4581 if (h->dynindx == -1
4582 && !h->forced_local)
4583 {
4584 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4585 return FALSE;
4586 }
4587
4588 if (!htab->symbian_p)
4589 {
4590 s = htab->sgot;
4591 h->got.offset = s->size;
4592 s->size += 4;
4593 dyn = htab->root.dynamic_sections_created;
4594 if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4595 || h->root.type != bfd_link_hash_undefweak)
4596 && (info->shared
4597 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
4598 htab->srelgot->size += sizeof (Elf32_External_Rel);
4599 }
4600 }
4601 else
4602 h->got.offset = (bfd_vma) -1;
4603
4604 if (eh->relocs_copied == NULL)
4605 return TRUE;
4606
4607 /* In the shared -Bsymbolic case, discard space allocated for
4608 dynamic pc-relative relocs against symbols which turn out to be
4609 defined in regular objects. For the normal shared case, discard
4610 space for pc-relative relocs that have become local due to symbol
4611 visibility changes. */
4612
4613 if (info->shared)
4614 {
4615 /* Discard relocs on undefined weak syms with non-default
4616 visibility. */
4617 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4618 && h->root.type == bfd_link_hash_undefweak)
4619 eh->relocs_copied = NULL;
4620 }
4621 else
4622 {
4623 /* For the non-shared case, discard space for relocs against
4624 symbols which turn out to need copy relocs or are not
4625 dynamic. */
4626
4627 if (!h->non_got_ref
4628 && ((h->def_dynamic
4629 && !h->def_regular)
4630 || (htab->root.dynamic_sections_created
4631 && (h->root.type == bfd_link_hash_undefweak
4632 || h->root.type == bfd_link_hash_undefined))))
4633 {
4634 /* Make sure this symbol is output as a dynamic symbol.
4635 Undefined weak syms won't yet be marked as dynamic. */
4636 if (h->dynindx == -1
4637 && !h->forced_local)
4638 {
4639 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4640 return FALSE;
4641 }
4642
4643 /* If that succeeded, we know we'll be keeping all the
4644 relocs. */
4645 if (h->dynindx != -1)
4646 goto keep;
4647 }
4648
4649 eh->relocs_copied = NULL;
4650
4651 keep: ;
4652 }
4653
4654 /* Finally, allocate space. */
4655 for (p = eh->relocs_copied; p != NULL; p = p->next)
4656 {
4657 asection *sreloc = elf_section_data (p->section)->sreloc;
4658 sreloc->size += p->count * sizeof (Elf32_External_Rel);
4659 }
4660
4661 return TRUE;
4662 }
4663
4664 /* Find any dynamic relocs that apply to read-only sections. */
4665
4666 static bfd_boolean
4667 elf32_arm_readonly_dynrelocs (struct elf_link_hash_entry *h, PTR inf)
4668 {
4669 struct elf32_arm_link_hash_entry *eh;
4670 struct elf32_arm_relocs_copied *p;
4671
4672 if (h->root.type == bfd_link_hash_warning)
4673 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4674
4675 eh = (struct elf32_arm_link_hash_entry *) h;
4676 for (p = eh->relocs_copied; p != NULL; p = p->next)
4677 {
4678 asection *s = p->section;
4679
4680 if (s != NULL && (s->flags & SEC_READONLY) != 0)
4681 {
4682 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4683
4684 info->flags |= DF_TEXTREL;
4685
4686 /* Not an error, just cut short the traversal. */
4687 return FALSE;
4688 }
4689 }
4690 return TRUE;
4691 }
4692
4693 /* Set the sizes of the dynamic sections. */
4694
4695 static bfd_boolean
4696 elf32_arm_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
4697 struct bfd_link_info * info)
4698 {
4699 bfd * dynobj;
4700 asection * s;
4701 bfd_boolean plt;
4702 bfd_boolean relocs;
4703 bfd *ibfd;
4704 struct elf32_arm_link_hash_table *htab;
4705
4706 htab = elf32_arm_hash_table (info);
4707 dynobj = elf_hash_table (info)->dynobj;
4708 BFD_ASSERT (dynobj != NULL);
4709
4710 if (elf_hash_table (info)->dynamic_sections_created)
4711 {
4712 /* Set the contents of the .interp section to the interpreter. */
4713 if (info->executable)
4714 {
4715 s = bfd_get_section_by_name (dynobj, ".interp");
4716 BFD_ASSERT (s != NULL);
4717 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
4718 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
4719 }
4720 }
4721
4722 /* Set up .got offsets for local syms, and space for local dynamic
4723 relocs. */
4724 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
4725 {
4726 bfd_signed_vma *local_got;
4727 bfd_signed_vma *end_local_got;
4728 char *local_tls_type;
4729 bfd_size_type locsymcount;
4730 Elf_Internal_Shdr *symtab_hdr;
4731 asection *srel;
4732
4733 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
4734 continue;
4735
4736 for (s = ibfd->sections; s != NULL; s = s->next)
4737 {
4738 struct elf32_arm_relocs_copied *p;
4739
4740 for (p = *((struct elf32_arm_relocs_copied **)
4741 &elf_section_data (s)->local_dynrel);
4742 p != NULL;
4743 p = p->next)
4744 {
4745 if (!bfd_is_abs_section (p->section)
4746 && bfd_is_abs_section (p->section->output_section))
4747 {
4748 /* Input section has been discarded, either because
4749 it is a copy of a linkonce section or due to
4750 linker script /DISCARD/, so we'll be discarding
4751 the relocs too. */
4752 }
4753 else if (p->count != 0)
4754 {
4755 srel = elf_section_data (p->section)->sreloc;
4756 srel->size += p->count * sizeof (Elf32_External_Rel);
4757 if ((p->section->output_section->flags & SEC_READONLY) != 0)
4758 info->flags |= DF_TEXTREL;
4759 }
4760 }
4761 }
4762
4763 local_got = elf_local_got_refcounts (ibfd);
4764 if (!local_got)
4765 continue;
4766
4767 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
4768 locsymcount = symtab_hdr->sh_info;
4769 end_local_got = local_got + locsymcount;
4770 s = htab->sgot;
4771 srel = htab->srelgot;
4772 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
4773 {
4774 if (*local_got > 0)
4775 {
4776 *local_got = s->size;
4777 s->size += 4;
4778 if (info->shared)
4779 srel->size += sizeof (Elf32_External_Rel);
4780 }
4781 else
4782 *local_got = (bfd_vma) -1;
4783 }
4784 }
4785
4786 /* Allocate global sym .plt and .got entries, and space for global
4787 sym dynamic relocs. */
4788 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info);
4789
4790 /* The check_relocs and adjust_dynamic_symbol entry points have
4791 determined the sizes of the various dynamic sections. Allocate
4792 memory for them. */
4793 plt = FALSE;
4794 relocs = FALSE;
4795 for (s = dynobj->sections; s != NULL; s = s->next)
4796 {
4797 const char * name;
4798 bfd_boolean strip;
4799
4800 if ((s->flags & SEC_LINKER_CREATED) == 0)
4801 continue;
4802
4803 /* It's OK to base decisions on the section name, because none
4804 of the dynobj section names depend upon the input files. */
4805 name = bfd_get_section_name (dynobj, s);
4806
4807 strip = FALSE;
4808
4809 if (strcmp (name, ".plt") == 0)
4810 {
4811 if (s->size == 0)
4812 {
4813 /* Strip this section if we don't need it; see the
4814 comment below. */
4815 strip = TRUE;
4816 }
4817 else
4818 {
4819 /* Remember whether there is a PLT. */
4820 plt = TRUE;
4821 }
4822 }
4823 else if (strncmp (name, ".rel", 4) == 0)
4824 {
4825 if (s->size == 0)
4826 {
4827 /* If we don't need this section, strip it from the
4828 output file. This is mostly to handle .rel.bss and
4829 .rel.plt. We must create both sections in
4830 create_dynamic_sections, because they must be created
4831 before the linker maps input sections to output
4832 sections. The linker does that before
4833 adjust_dynamic_symbol is called, and it is that
4834 function which decides whether anything needs to go
4835 into these sections. */
4836 strip = TRUE;
4837 }
4838 else
4839 {
4840 /* Remember whether there are any reloc sections other
4841 than .rel.plt. */
4842 if (strcmp (name, ".rel.plt") != 0)
4843 relocs = TRUE;
4844
4845 /* We use the reloc_count field as a counter if we need
4846 to copy relocs into the output file. */
4847 s->reloc_count = 0;
4848 }
4849 }
4850 else if (strncmp (name, ".got", 4) != 0)
4851 {
4852 /* It's not one of our sections, so don't allocate space. */
4853 continue;
4854 }
4855
4856 if (strip)
4857 {
4858 _bfd_strip_section_from_output (info, s);
4859 continue;
4860 }
4861
4862 /* Allocate memory for the section contents. */
4863 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
4864 if (s->contents == NULL && s->size != 0)
4865 return FALSE;
4866 }
4867
4868 if (elf_hash_table (info)->dynamic_sections_created)
4869 {
4870 /* Add some entries to the .dynamic section. We fill in the
4871 values later, in elf32_arm_finish_dynamic_sections, but we
4872 must add the entries now so that we get the correct size for
4873 the .dynamic section. The DT_DEBUG entry is filled in by the
4874 dynamic linker and used by the debugger. */
4875 #define add_dynamic_entry(TAG, VAL) \
4876 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4877
4878 if (!info->shared)
4879 {
4880 if (!add_dynamic_entry (DT_DEBUG, 0))
4881 return FALSE;
4882 }
4883
4884 if (plt)
4885 {
4886 if ( !add_dynamic_entry (DT_PLTGOT, 0)
4887 || !add_dynamic_entry (DT_PLTRELSZ, 0)
4888 || !add_dynamic_entry (DT_PLTREL, DT_REL)
4889 || !add_dynamic_entry (DT_JMPREL, 0))
4890 return FALSE;
4891 }
4892
4893 if (relocs)
4894 {
4895 if ( !add_dynamic_entry (DT_REL, 0)
4896 || !add_dynamic_entry (DT_RELSZ, 0)
4897 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
4898 return FALSE;
4899 }
4900
4901 /* If any dynamic relocs apply to a read-only section,
4902 then we need a DT_TEXTREL entry. */
4903 if ((info->flags & DF_TEXTREL) == 0)
4904 elf_link_hash_traverse (&htab->root, elf32_arm_readonly_dynrelocs,
4905 (PTR) info);
4906
4907 if ((info->flags & DF_TEXTREL) != 0)
4908 {
4909 if (!add_dynamic_entry (DT_TEXTREL, 0))
4910 return FALSE;
4911 info->flags |= DF_TEXTREL;
4912 }
4913 }
4914 #undef add_synamic_entry
4915
4916 return TRUE;
4917 }
4918
4919 /* Finish up dynamic symbol handling. We set the contents of various
4920 dynamic sections here. */
4921
4922 static bfd_boolean
4923 elf32_arm_finish_dynamic_symbol (bfd * output_bfd, struct bfd_link_info * info,
4924 struct elf_link_hash_entry * h, Elf_Internal_Sym * sym)
4925 {
4926 bfd * dynobj;
4927 struct elf32_arm_link_hash_table *htab;
4928 struct elf32_arm_link_hash_entry *eh;
4929
4930 dynobj = elf_hash_table (info)->dynobj;
4931 htab = elf32_arm_hash_table (info);
4932 eh = (struct elf32_arm_link_hash_entry *) h;
4933
4934 if (h->plt.offset != (bfd_vma) -1)
4935 {
4936 asection * splt;
4937 asection * srel;
4938 bfd_byte *loc;
4939 bfd_vma plt_index;
4940 Elf_Internal_Rela rel;
4941
4942 /* This symbol has an entry in the procedure linkage table. Set
4943 it up. */
4944
4945 BFD_ASSERT (h->dynindx != -1);
4946
4947 splt = bfd_get_section_by_name (dynobj, ".plt");
4948 srel = bfd_get_section_by_name (dynobj, ".rel.plt");
4949 BFD_ASSERT (splt != NULL && srel != NULL);
4950
4951 /* Fill in the entry in the procedure linkage table. */
4952 if (htab->symbian_p)
4953 {
4954 unsigned i;
4955 for (i = 0; i < htab->plt_entry_size / 4; ++i)
4956 bfd_put_32 (output_bfd,
4957 elf32_arm_symbian_plt_entry[i],
4958 splt->contents + h->plt.offset + 4 * i);
4959
4960 /* Fill in the entry in the .rel.plt section. */
4961 rel.r_offset = (splt->output_section->vma
4962 + splt->output_offset
4963 + h->plt.offset + 4 * (i - 1));
4964 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
4965
4966 /* Get the index in the procedure linkage table which
4967 corresponds to this symbol. This is the index of this symbol
4968 in all the symbols for which we are making plt entries. The
4969 first entry in the procedure linkage table is reserved. */
4970 plt_index = ((h->plt.offset - htab->plt_header_size)
4971 / htab->plt_entry_size);
4972 }
4973 else
4974 {
4975 bfd_vma got_offset;
4976 bfd_vma got_displacement;
4977 asection * sgot;
4978
4979 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
4980 BFD_ASSERT (sgot != NULL);
4981
4982 /* Get the offset into the .got.plt table of the entry that
4983 corresponds to this function. */
4984 got_offset = eh->plt_got_offset;
4985
4986 /* Get the index in the procedure linkage table which
4987 corresponds to this symbol. This is the index of this symbol
4988 in all the symbols for which we are making plt entries. The
4989 first three entries in .got.plt are reserved; after that
4990 symbols appear in the same order as in .plt. */
4991 plt_index = (got_offset - 12) / 4;
4992
4993 /* Calculate the displacement between the PLT slot and the
4994 entry in the GOT. The eight-byte offset accounts for the
4995 value produced by adding to pc in the first instruction
4996 of the PLT stub. */
4997 got_displacement = (sgot->output_section->vma
4998 + sgot->output_offset
4999 + got_offset
5000 - splt->output_section->vma
5001 - splt->output_offset
5002 - h->plt.offset
5003 - 8);
5004
5005 BFD_ASSERT ((got_displacement & 0xf0000000) == 0);
5006
5007 if (eh->plt_thumb_refcount > 0)
5008 {
5009 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[0],
5010 splt->contents + h->plt.offset - 4);
5011 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[1],
5012 splt->contents + h->plt.offset - 2);
5013 }
5014
5015 bfd_put_32 (output_bfd, elf32_arm_plt_entry[0] | ((got_displacement & 0x0ff00000) >> 20),
5016 splt->contents + h->plt.offset + 0);
5017 bfd_put_32 (output_bfd, elf32_arm_plt_entry[1] | ((got_displacement & 0x000ff000) >> 12),
5018 splt->contents + h->plt.offset + 4);
5019 bfd_put_32 (output_bfd, elf32_arm_plt_entry[2] | (got_displacement & 0x00000fff),
5020 splt->contents + h->plt.offset + 8);
5021 #ifdef FOUR_WORD_PLT
5022 bfd_put_32 (output_bfd, elf32_arm_plt_entry[3],
5023 splt->contents + h->plt.offset + 12);
5024 #endif
5025
5026 /* Fill in the entry in the global offset table. */
5027 bfd_put_32 (output_bfd,
5028 (splt->output_section->vma
5029 + splt->output_offset),
5030 sgot->contents + got_offset);
5031
5032 /* Fill in the entry in the .rel.plt section. */
5033 rel.r_offset = (sgot->output_section->vma
5034 + sgot->output_offset
5035 + got_offset);
5036 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT);
5037 }
5038
5039 loc = srel->contents + plt_index * sizeof (Elf32_External_Rel);
5040 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5041
5042 if (!h->def_regular)
5043 {
5044 /* Mark the symbol as undefined, rather than as defined in
5045 the .plt section. Leave the value alone. */
5046 sym->st_shndx = SHN_UNDEF;
5047 /* If the symbol is weak, we do need to clear the value.
5048 Otherwise, the PLT entry would provide a definition for
5049 the symbol even if the symbol wasn't defined anywhere,
5050 and so the symbol would never be NULL. */
5051 if (!h->ref_regular_nonweak)
5052 sym->st_value = 0;
5053 }
5054 }
5055
5056 if (h->got.offset != (bfd_vma) -1)
5057 {
5058 asection * sgot;
5059 asection * srel;
5060 Elf_Internal_Rela rel;
5061 bfd_byte *loc;
5062
5063 /* This symbol has an entry in the global offset table. Set it
5064 up. */
5065 sgot = bfd_get_section_by_name (dynobj, ".got");
5066 srel = bfd_get_section_by_name (dynobj, ".rel.got");
5067 BFD_ASSERT (sgot != NULL && srel != NULL);
5068
5069 rel.r_offset = (sgot->output_section->vma
5070 + sgot->output_offset
5071 + (h->got.offset &~ (bfd_vma) 1));
5072
5073 /* If this is a static link, or it is a -Bsymbolic link and the
5074 symbol is defined locally or was forced to be local because
5075 of a version file, we just want to emit a RELATIVE reloc.
5076 The entry in the global offset table will already have been
5077 initialized in the relocate_section function. */
5078 if (info->shared
5079 && SYMBOL_REFERENCES_LOCAL (info, h))
5080 {
5081 BFD_ASSERT((h->got.offset & 1) != 0);
5082 rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
5083 }
5084 else
5085 {
5086 BFD_ASSERT((h->got.offset & 1) == 0);
5087 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
5088 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
5089 }
5090
5091 loc = srel->contents + srel->reloc_count++ * sizeof (Elf32_External_Rel);
5092 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5093 }
5094
5095 if (h->needs_copy)
5096 {
5097 asection * s;
5098 Elf_Internal_Rela rel;
5099 bfd_byte *loc;
5100
5101 /* This symbol needs a copy reloc. Set it up. */
5102 BFD_ASSERT (h->dynindx != -1
5103 && (h->root.type == bfd_link_hash_defined
5104 || h->root.type == bfd_link_hash_defweak));
5105
5106 s = bfd_get_section_by_name (h->root.u.def.section->owner,
5107 ".rel.bss");
5108 BFD_ASSERT (s != NULL);
5109
5110 rel.r_offset = (h->root.u.def.value
5111 + h->root.u.def.section->output_section->vma
5112 + h->root.u.def.section->output_offset);
5113 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY);
5114 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rel);
5115 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5116 }
5117
5118 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
5119 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
5120 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
5121 sym->st_shndx = SHN_ABS;
5122
5123 return TRUE;
5124 }
5125
5126 /* Finish up the dynamic sections. */
5127
5128 static bfd_boolean
5129 elf32_arm_finish_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info)
5130 {
5131 bfd * dynobj;
5132 asection * sgot;
5133 asection * sdyn;
5134
5135 dynobj = elf_hash_table (info)->dynobj;
5136
5137 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
5138 BFD_ASSERT (elf32_arm_hash_table (info)->symbian_p || sgot != NULL);
5139 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
5140
5141 if (elf_hash_table (info)->dynamic_sections_created)
5142 {
5143 asection *splt;
5144 Elf32_External_Dyn *dyncon, *dynconend;
5145 struct elf32_arm_link_hash_table *htab;
5146
5147 htab = elf32_arm_hash_table (info);
5148 splt = bfd_get_section_by_name (dynobj, ".plt");
5149 BFD_ASSERT (splt != NULL && sdyn != NULL);
5150
5151 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5152 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5153
5154 for (; dyncon < dynconend; dyncon++)
5155 {
5156 Elf_Internal_Dyn dyn;
5157 const char * name;
5158 asection * s;
5159
5160 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5161
5162 switch (dyn.d_tag)
5163 {
5164 unsigned int type;
5165
5166 default:
5167 break;
5168
5169 case DT_HASH:
5170 name = ".hash";
5171 goto get_vma_if_bpabi;
5172 case DT_STRTAB:
5173 name = ".dynstr";
5174 goto get_vma_if_bpabi;
5175 case DT_SYMTAB:
5176 name = ".dynsym";
5177 goto get_vma_if_bpabi;
5178 case DT_VERSYM:
5179 name = ".gnu.version";
5180 goto get_vma_if_bpabi;
5181 case DT_VERDEF:
5182 name = ".gnu.version_d";
5183 goto get_vma_if_bpabi;
5184 case DT_VERNEED:
5185 name = ".gnu.version_r";
5186 goto get_vma_if_bpabi;
5187
5188 case DT_PLTGOT:
5189 name = ".got";
5190 goto get_vma;
5191 case DT_JMPREL:
5192 name = ".rel.plt";
5193 get_vma:
5194 s = bfd_get_section_by_name (output_bfd, name);
5195 BFD_ASSERT (s != NULL);
5196 if (!htab->symbian_p)
5197 dyn.d_un.d_ptr = s->vma;
5198 else
5199 /* In the BPABI, tags in the PT_DYNAMIC section point
5200 at the file offset, not the memory address, for the
5201 convenience of the post linker. */
5202 dyn.d_un.d_ptr = s->filepos;
5203 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5204 break;
5205
5206 get_vma_if_bpabi:
5207 if (htab->symbian_p)
5208 goto get_vma;
5209 break;
5210
5211 case DT_PLTRELSZ:
5212 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5213 BFD_ASSERT (s != NULL);
5214 dyn.d_un.d_val = s->size;
5215 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5216 break;
5217
5218 case DT_RELSZ:
5219 if (!htab->symbian_p)
5220 {
5221 /* My reading of the SVR4 ABI indicates that the
5222 procedure linkage table relocs (DT_JMPREL) should be
5223 included in the overall relocs (DT_REL). This is
5224 what Solaris does. However, UnixWare can not handle
5225 that case. Therefore, we override the DT_RELSZ entry
5226 here to make it not include the JMPREL relocs. Since
5227 the linker script arranges for .rel.plt to follow all
5228 other relocation sections, we don't have to worry
5229 about changing the DT_REL entry. */
5230 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5231 if (s != NULL)
5232 dyn.d_un.d_val -= s->size;
5233 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5234 break;
5235 }
5236 /* Fall through */
5237
5238 case DT_REL:
5239 case DT_RELA:
5240 case DT_RELASZ:
5241 /* In the BPABI, the DT_REL tag must point at the file
5242 offset, not the VMA, of the first relocation
5243 section. So, we use code similar to that in
5244 elflink.c, but do not check for SHF_ALLOC on the
5245 relcoation section, since relocations sections are
5246 never allocated under the BPABI. The comments above
5247 about Unixware notwithstanding, we include all of the
5248 relocations here. */
5249 if (htab->symbian_p)
5250 {
5251 unsigned int i;
5252 type = ((dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5253 ? SHT_REL : SHT_RELA);
5254 dyn.d_un.d_val = 0;
5255 for (i = 1; i < elf_numsections (output_bfd); i++)
5256 {
5257 Elf_Internal_Shdr *hdr
5258 = elf_elfsections (output_bfd)[i];
5259 if (hdr->sh_type == type)
5260 {
5261 if (dyn.d_tag == DT_RELSZ
5262 || dyn.d_tag == DT_RELASZ)
5263 dyn.d_un.d_val += hdr->sh_size;
5264 else if ((ufile_ptr) hdr->sh_offset
5265 <= dyn.d_un.d_val - 1)
5266 dyn.d_un.d_val = hdr->sh_offset;
5267 }
5268 }
5269 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5270 }
5271 break;
5272
5273 /* Set the bottom bit of DT_INIT/FINI if the
5274 corresponding function is Thumb. */
5275 case DT_INIT:
5276 name = info->init_function;
5277 goto get_sym;
5278 case DT_FINI:
5279 name = info->fini_function;
5280 get_sym:
5281 /* If it wasn't set by elf_bfd_final_link
5282 then there is nothing to adjust. */
5283 if (dyn.d_un.d_val != 0)
5284 {
5285 struct elf_link_hash_entry * eh;
5286
5287 eh = elf_link_hash_lookup (elf_hash_table (info), name,
5288 FALSE, FALSE, TRUE);
5289 if (eh != (struct elf_link_hash_entry *) NULL
5290 && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC)
5291 {
5292 dyn.d_un.d_val |= 1;
5293 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5294 }
5295 }
5296 break;
5297 }
5298 }
5299
5300 /* Fill in the first entry in the procedure linkage table. */
5301 if (splt->size > 0 && elf32_arm_hash_table (info)->plt_header_size)
5302 {
5303 bfd_vma got_displacement;
5304
5305 /* Calculate the displacement between the PLT slot and &GOT[0]. */
5306 got_displacement = (sgot->output_section->vma
5307 + sgot->output_offset
5308 - splt->output_section->vma
5309 - splt->output_offset
5310 - 16);
5311
5312 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[0], splt->contents + 0);
5313 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[1], splt->contents + 4);
5314 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[2], splt->contents + 8);
5315 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[3], splt->contents + 12);
5316 #ifdef FOUR_WORD_PLT
5317 /* The displacement value goes in the otherwise-unused last word of
5318 the second entry. */
5319 bfd_put_32 (output_bfd, got_displacement, splt->contents + 28);
5320 #else
5321 bfd_put_32 (output_bfd, got_displacement, splt->contents + 16);
5322 #endif
5323 }
5324
5325 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5326 really seem like the right value. */
5327 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
5328 }
5329
5330 /* Fill in the first three entries in the global offset table. */
5331 if (sgot)
5332 {
5333 if (sgot->size > 0)
5334 {
5335 if (sdyn == NULL)
5336 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
5337 else
5338 bfd_put_32 (output_bfd,
5339 sdyn->output_section->vma + sdyn->output_offset,
5340 sgot->contents);
5341 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
5342 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
5343 }
5344
5345 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
5346 }
5347
5348 return TRUE;
5349 }
5350
5351 static void
5352 elf32_arm_post_process_headers (bfd * abfd, struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
5353 {
5354 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
5355 struct elf32_arm_link_hash_table *globals;
5356
5357 i_ehdrp = elf_elfheader (abfd);
5358
5359 if (EF_ARM_EABI_VERSION (i_ehdrp->e_flags) == EF_ARM_EABI_UNKNOWN)
5360 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_ARM;
5361 else
5362 i_ehdrp->e_ident[EI_OSABI] = 0;
5363 i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION;
5364
5365 if (link_info)
5366 {
5367 globals = elf32_arm_hash_table (link_info);
5368 if (globals->byteswap_code)
5369 i_ehdrp->e_flags |= EF_ARM_BE8;
5370 }
5371 }
5372
5373 static enum elf_reloc_type_class
5374 elf32_arm_reloc_type_class (const Elf_Internal_Rela *rela)
5375 {
5376 switch ((int) ELF32_R_TYPE (rela->r_info))
5377 {
5378 case R_ARM_RELATIVE:
5379 return reloc_class_relative;
5380 case R_ARM_JUMP_SLOT:
5381 return reloc_class_plt;
5382 case R_ARM_COPY:
5383 return reloc_class_copy;
5384 default:
5385 return reloc_class_normal;
5386 }
5387 }
5388
5389 /* Set the right machine number for an Arm ELF file. */
5390
5391 static bfd_boolean
5392 elf32_arm_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr)
5393 {
5394 if (hdr->sh_type == SHT_NOTE)
5395 *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS;
5396
5397 return TRUE;
5398 }
5399
5400 static void
5401 elf32_arm_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED)
5402 {
5403 bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
5404 }
5405
5406 /* Return TRUE if this is an unwinding table entry. */
5407
5408 static bfd_boolean
5409 is_arm_elf_unwind_section_name (bfd * abfd ATTRIBUTE_UNUSED, const char * name)
5410 {
5411 size_t len1, len2;
5412
5413 len1 = sizeof (ELF_STRING_ARM_unwind) - 1;
5414 len2 = sizeof (ELF_STRING_ARM_unwind_once) - 1;
5415 return (strncmp (name, ELF_STRING_ARM_unwind, len1) == 0
5416 || strncmp (name, ELF_STRING_ARM_unwind_once, len2) == 0);
5417 }
5418
5419
5420 /* Set the type and flags for an ARM section. We do this by
5421 the section name, which is a hack, but ought to work. */
5422
5423 static bfd_boolean
5424 elf32_arm_fake_sections (bfd * abfd, Elf_Internal_Shdr * hdr, asection * sec)
5425 {
5426 const char * name;
5427
5428 name = bfd_get_section_name (abfd, sec);
5429
5430 if (is_arm_elf_unwind_section_name (abfd, name))
5431 {
5432 hdr->sh_type = SHT_ARM_EXIDX;
5433 hdr->sh_flags |= SHF_LINK_ORDER;
5434 }
5435 return TRUE;
5436 }
5437
5438 /* Handle an ARM specific section when reading an object file.
5439 This is called when elf.c finds a section with an unknown type. */
5440
5441 static bfd_boolean
5442 elf32_arm_section_from_shdr (bfd *abfd,
5443 Elf_Internal_Shdr * hdr,
5444 const char *name)
5445 {
5446 /* There ought to be a place to keep ELF backend specific flags, but
5447 at the moment there isn't one. We just keep track of the
5448 sections by their name, instead. Fortunately, the ABI gives
5449 names for all the ARM specific sections, so we will probably get
5450 away with this. */
5451 switch (hdr->sh_type)
5452 {
5453 case SHT_ARM_EXIDX:
5454 break;
5455
5456 default:
5457 return FALSE;
5458 }
5459
5460 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
5461 return FALSE;
5462
5463 return TRUE;
5464 }
5465
5466 /* Called for each symbol. Builds a section map based on mapping symbols.
5467 Does not alter any of the symbols. */
5468
5469 static bfd_boolean
5470 elf32_arm_output_symbol_hook (struct bfd_link_info *info,
5471 const char *name,
5472 Elf_Internal_Sym *elfsym,
5473 asection *input_sec,
5474 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
5475 {
5476 int mapcount;
5477 elf32_arm_section_map *map;
5478 struct elf32_arm_link_hash_table *globals;
5479
5480 /* Only do this on final link. */
5481 if (info->relocatable)
5482 return TRUE;
5483
5484 /* Only build a map if we need to byteswap code. */
5485 globals = elf32_arm_hash_table (info);
5486 if (!globals->byteswap_code)
5487 return TRUE;
5488
5489 /* We only want mapping symbols. */
5490 if (! is_arm_mapping_symbol_name (name))
5491 return TRUE;
5492
5493 mapcount = ++(elf32_arm_section_data (input_sec)->mapcount);
5494 map = elf32_arm_section_data (input_sec)->map;
5495 /* TODO: This may be inefficient, but we probably don't usually have many
5496 mapping symbols per section. */
5497 map = bfd_realloc (map, mapcount * sizeof (elf32_arm_section_map));
5498 elf32_arm_section_data (input_sec)->map = map;
5499
5500 map[mapcount - 1].vma = elfsym->st_value;
5501 map[mapcount - 1].type = name[1];
5502 return TRUE;
5503 }
5504
5505
5506 /* Allocate target specific section data. */
5507
5508 static bfd_boolean
5509 elf32_arm_new_section_hook (bfd *abfd, asection *sec)
5510 {
5511 struct _arm_elf_section_data *sdata;
5512 bfd_size_type amt = sizeof (*sdata);
5513
5514 sdata = bfd_zalloc (abfd, amt);
5515 if (sdata == NULL)
5516 return FALSE;
5517 sec->used_by_bfd = sdata;
5518
5519 return _bfd_elf_new_section_hook (abfd, sec);
5520 }
5521
5522
5523 /* Used to order a list of mapping symbols by address. */
5524
5525 static int
5526 elf32_arm_compare_mapping (const void * a, const void * b)
5527 {
5528 return ((const elf32_arm_section_map *) a)->vma
5529 > ((const elf32_arm_section_map *) b)->vma;
5530 }
5531
5532
5533 /* Do code byteswapping. Return FALSE afterwards so that the section is
5534 written out as normal. */
5535
5536 static bfd_boolean
5537 elf32_arm_write_section (bfd *output_bfd ATTRIBUTE_UNUSED, asection *sec,
5538 bfd_byte *contents)
5539 {
5540 int mapcount;
5541 elf32_arm_section_map *map;
5542 bfd_vma ptr;
5543 bfd_vma end;
5544 bfd_vma offset;
5545 bfd_byte tmp;
5546 int i;
5547
5548 mapcount = elf32_arm_section_data (sec)->mapcount;
5549 map = elf32_arm_section_data (sec)->map;
5550
5551 if (mapcount == 0)
5552 return FALSE;
5553
5554 qsort (map, mapcount, sizeof (elf32_arm_section_map),
5555 elf32_arm_compare_mapping);
5556
5557 offset = sec->output_section->vma + sec->output_offset;
5558 ptr = map[0].vma - offset;
5559 for (i = 0; i < mapcount; i++)
5560 {
5561 if (i == mapcount - 1)
5562 end = sec->size;
5563 else
5564 end = map[i + 1].vma - offset;
5565
5566 switch (map[i].type)
5567 {
5568 case 'a':
5569 /* Byte swap code words. */
5570 while (ptr + 3 < end)
5571 {
5572 tmp = contents[ptr];
5573 contents[ptr] = contents[ptr + 3];
5574 contents[ptr + 3] = tmp;
5575 tmp = contents[ptr + 1];
5576 contents[ptr + 1] = contents[ptr + 2];
5577 contents[ptr + 2] = tmp;
5578 ptr += 4;
5579 }
5580 break;
5581
5582 case 't':
5583 /* Byte swap code halfwords. */
5584 while (ptr + 1 < end)
5585 {
5586 tmp = contents[ptr];
5587 contents[ptr] = contents[ptr + 1];
5588 contents[ptr + 1] = tmp;
5589 ptr += 2;
5590 }
5591 break;
5592
5593 case 'd':
5594 /* Leave data alone. */
5595 break;
5596 }
5597 ptr = end;
5598 }
5599 free (map);
5600 return FALSE;
5601 }
5602
5603 /* Display STT_ARM_TFUNC symbols as functions. */
5604
5605 static void
5606 elf32_arm_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5607 asymbol *asym)
5608 {
5609 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5610
5611 if (ELF_ST_TYPE (elfsym->internal_elf_sym.st_info) == STT_ARM_TFUNC)
5612 elfsym->symbol.flags |= BSF_FUNCTION;
5613 }
5614
5615
5616 /* Mangle thumb function symbols as we read them in. */
5617
5618 static void
5619 elf32_arm_swap_symbol_in (bfd * abfd,
5620 const void *psrc,
5621 const void *pshn,
5622 Elf_Internal_Sym *dst)
5623 {
5624 bfd_elf32_swap_symbol_in (abfd, psrc, pshn, dst);
5625
5626 /* New EABI objects mark thumb function symbols by setting the low bit of
5627 the address. Turn these into STT_ARM_TFUNC. */
5628 if (ELF_ST_TYPE (dst->st_info) == STT_FUNC
5629 && (dst->st_value & 1))
5630 {
5631 dst->st_info = ELF_ST_INFO (ELF_ST_BIND (dst->st_info), STT_ARM_TFUNC);
5632 dst->st_value &= ~(bfd_vma) 1;
5633 }
5634 }
5635
5636
5637 /* Mangle thumb function symbols as we write them out. */
5638
5639 static void
5640 elf32_arm_swap_symbol_out (bfd *abfd,
5641 const Elf_Internal_Sym *src,
5642 void *cdst,
5643 void *shndx)
5644 {
5645 Elf_Internal_Sym newsym;
5646
5647 /* We convert STT_ARM_TFUNC symbols into STT_FUNC with the low bit
5648 of the address set, as per the new EABI. We do this unconditionally
5649 because objcopy does not set the elf header flags until after
5650 it writes out the symbol table. */
5651 if (ELF_ST_TYPE (src->st_info) == STT_ARM_TFUNC)
5652 {
5653 newsym = *src;
5654 newsym.st_info = ELF_ST_INFO (ELF_ST_BIND (src->st_info), STT_FUNC);
5655 newsym.st_value |= 1;
5656
5657 src = &newsym;
5658 }
5659 bfd_elf32_swap_symbol_out (abfd, src, cdst, shndx);
5660 }
5661
5662 /* We use this to override swap_symbol_in and swap_symbol_out. */
5663 const struct elf_size_info elf32_arm_size_info = {
5664 sizeof (Elf32_External_Ehdr),
5665 sizeof (Elf32_External_Phdr),
5666 sizeof (Elf32_External_Shdr),
5667 sizeof (Elf32_External_Rel),
5668 sizeof (Elf32_External_Rela),
5669 sizeof (Elf32_External_Sym),
5670 sizeof (Elf32_External_Dyn),
5671 sizeof (Elf_External_Note),
5672 4,
5673 1,
5674 32, 2,
5675 ELFCLASS32, EV_CURRENT,
5676 bfd_elf32_write_out_phdrs,
5677 bfd_elf32_write_shdrs_and_ehdr,
5678 bfd_elf32_write_relocs,
5679 elf32_arm_swap_symbol_in,
5680 elf32_arm_swap_symbol_out,
5681 bfd_elf32_slurp_reloc_table,
5682 bfd_elf32_slurp_symbol_table,
5683 bfd_elf32_swap_dyn_in,
5684 bfd_elf32_swap_dyn_out,
5685 bfd_elf32_swap_reloc_in,
5686 bfd_elf32_swap_reloc_out,
5687 bfd_elf32_swap_reloca_in,
5688 bfd_elf32_swap_reloca_out
5689 };
5690
5691 #define ELF_ARCH bfd_arch_arm
5692 #define ELF_MACHINE_CODE EM_ARM
5693 #ifdef __QNXTARGET__
5694 #define ELF_MAXPAGESIZE 0x1000
5695 #else
5696 #define ELF_MAXPAGESIZE 0x8000
5697 #endif
5698
5699 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
5700 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
5701 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
5702 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
5703 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
5704 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
5705 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
5706 #define bfd_elf32_new_section_hook elf32_arm_new_section_hook
5707 #define bfd_elf32_bfd_is_target_special_symbol elf32_arm_is_target_special_symbol
5708
5709 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type
5710 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
5711 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
5712 #define elf_backend_check_relocs elf32_arm_check_relocs
5713 #define elf_backend_relocate_section elf32_arm_relocate_section
5714 #define elf_backend_write_section elf32_arm_write_section
5715 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
5716 #define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections
5717 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
5718 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
5719 #define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook
5720 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
5721 #define elf_backend_post_process_headers elf32_arm_post_process_headers
5722 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class
5723 #define elf_backend_object_p elf32_arm_object_p
5724 #define elf_backend_section_flags elf32_arm_section_flags
5725 #define elf_backend_fake_sections elf32_arm_fake_sections
5726 #define elf_backend_section_from_shdr elf32_arm_section_from_shdr
5727 #define elf_backend_final_write_processing elf32_arm_final_write_processing
5728 #define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol
5729 #define elf_backend_symbol_processing elf32_arm_symbol_processing
5730 #define elf_backend_size_info elf32_arm_size_info
5731
5732 #define elf_backend_can_refcount 1
5733 #define elf_backend_can_gc_sections 1
5734 #define elf_backend_plt_readonly 1
5735 #define elf_backend_want_got_plt 1
5736 #define elf_backend_want_plt_sym 0
5737 #if !USE_REL
5738 #define elf_backend_rela_normal 1
5739 #endif
5740
5741 #define elf_backend_got_header_size 12
5742
5743 #include "elf32-target.h"
5744
5745 /* Symbian OS Targets */
5746
5747 #undef TARGET_LITTLE_SYM
5748 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_symbian_vec
5749 #undef TARGET_LITTLE_NAME
5750 #define TARGET_LITTLE_NAME "elf32-littlearm-symbian"
5751 #undef TARGET_BIG_SYM
5752 #define TARGET_BIG_SYM bfd_elf32_bigarm_symbian_vec
5753 #undef TARGET_BIG_NAME
5754 #define TARGET_BIG_NAME "elf32-bigarm-symbian"
5755
5756 /* Like elf32_arm_link_hash_table_create -- but overrides
5757 appropriately for Symbian OS. */
5758 static struct bfd_link_hash_table *
5759 elf32_arm_symbian_link_hash_table_create (bfd *abfd)
5760 {
5761 struct bfd_link_hash_table *ret;
5762
5763 ret = elf32_arm_link_hash_table_create (abfd);
5764 if (ret)
5765 {
5766 struct elf32_arm_link_hash_table *htab
5767 = (struct elf32_arm_link_hash_table *)ret;
5768 /* There is no PLT header for Symbian OS. */
5769 htab->plt_header_size = 0;
5770 /* The PLT entries are each three instructions. */
5771 htab->plt_entry_size = 4 * NUM_ELEM (elf32_arm_symbian_plt_entry);
5772 htab->symbian_p = 1;
5773 }
5774 return ret;
5775 }
5776
5777 /* In a BPABI executable, the dynamic linking sections do not go in
5778 the loadable read-only segment. The post-linker may wish to refer
5779 to these sections, but they are not part of the final program
5780 image. */
5781 static struct bfd_elf_special_section const
5782 elf32_arm_symbian_special_sections[]=
5783 {
5784 { ".dynamic", 8, 0, SHT_DYNAMIC, 0 },
5785 { ".dynstr", 7, 0, SHT_STRTAB, 0 },
5786 { ".dynsym", 7, 0, SHT_DYNSYM, 0 },
5787 { ".got", 4, 0, SHT_PROGBITS, 0 },
5788 { ".hash", 5, 0, SHT_HASH, 0 },
5789 { NULL, 0, 0, 0, 0 }
5790 };
5791
5792 static void
5793 elf32_arm_symbian_begin_write_processing (bfd *abfd,
5794 struct bfd_link_info *link_info
5795 ATTRIBUTE_UNUSED)
5796 {
5797 /* BPABI objects are never loaded directly by an OS kernel; they are
5798 processed by a postlinker first, into an OS-specific format. If
5799 the D_PAGED bit is set on the file, BFD will align segments on
5800 page boundaries, so that an OS can directly map the file. With
5801 BPABI objects, that just results in wasted space. In addition,
5802 because we clear the D_PAGED bit, map_sections_to_segments will
5803 recognize that the program headers should not be mapped into any
5804 loadable segment. */
5805 abfd->flags &= ~D_PAGED;
5806 }
5807
5808 static bfd_boolean
5809 elf32_arm_symbian_modify_segment_map (bfd *abfd,
5810 struct bfd_link_info *info
5811 ATTRIBUTE_UNUSED)
5812 {
5813 struct elf_segment_map *m;
5814 asection *dynsec;
5815
5816 /* BPABI shared libraries and executables should have a PT_DYNAMIC
5817 segment. However, because the .dynamic section is not marked
5818 with SEC_LOAD, the generic ELF code will not create such a
5819 segment. */
5820 dynsec = bfd_get_section_by_name (abfd, ".dynamic");
5821 if (dynsec)
5822 {
5823 m = _bfd_elf_make_dynamic_segment (abfd, dynsec);
5824 m->next = elf_tdata (abfd)->segment_map;
5825 elf_tdata (abfd)->segment_map = m;
5826 }
5827
5828 return TRUE;
5829 }
5830
5831 #undef elf32_bed
5832 #define elf32_bed elf32_arm_symbian_bed
5833
5834 /* The dynamic sections are not allocated on SymbianOS; the postlinker
5835 will process them and then discard them. */
5836 #undef ELF_DYNAMIC_SEC_FLAGS
5837 #define ELF_DYNAMIC_SEC_FLAGS \
5838 (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED)
5839
5840 #undef bfd_elf32_bfd_link_hash_table_create
5841 #define bfd_elf32_bfd_link_hash_table_create \
5842 elf32_arm_symbian_link_hash_table_create
5843
5844 #undef elf_backend_special_sections
5845 #define elf_backend_special_sections elf32_arm_symbian_special_sections
5846
5847 #undef elf_backend_begin_write_processing
5848 #define elf_backend_begin_write_processing \
5849 elf32_arm_symbian_begin_write_processing
5850
5851 #undef elf_backend_modify_segment_map
5852 #define elf_backend_modify_segment_map elf32_arm_symbian_modify_segment_map
5853
5854 /* There is no .got section for BPABI objects, and hence no header. */
5855 #undef elf_backend_got_header_size
5856 #define elf_backend_got_header_size 0
5857
5858 /* Similarly, there is no .got.plt section. */
5859 #undef elf_backend_want_got_plt
5860 #define elf_backend_want_got_plt 0
5861
5862 #include "elf32-target.h"
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