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* libbfd-in.h (_bfd_ar_spacepad): New prototype.
[binutils.git] / bfd / elf32-arm.c
blob660a9909dc04ae438a0ccae6d1e8e30dc9e0cf7d
1 /* 32-bit ELF support for ARM
2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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 elf_info_to_howto 0
32 #define elf_info_to_howto_rel elf32_arm_info_to_howto
33
34 #define ARM_ELF_ABI_VERSION 0
35 #define ARM_ELF_OS_ABI_VERSION ELFOSABI_ARM
36
37 static reloc_howto_type * elf32_arm_reloc_type_lookup
38 PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
39 static bfd_boolean elf32_arm_nabi_grok_prstatus
40 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
41 static bfd_boolean elf32_arm_nabi_grok_psinfo
42 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
43
44 /* Note: code such as elf32_arm_reloc_type_lookup expect to use e.g.
45 R_ARM_PC24 as an index into this, and find the R_ARM_PC24 HOWTO
46 in that slot. */
47
48 static reloc_howto_type elf32_arm_howto_table[] =
49 {
50 /* No relocation */
51 HOWTO (R_ARM_NONE, /* type */
52 0, /* rightshift */
53 0, /* size (0 = byte, 1 = short, 2 = long) */
54 0, /* bitsize */
55 FALSE, /* pc_relative */
56 0, /* bitpos */
57 complain_overflow_dont,/* complain_on_overflow */
58 bfd_elf_generic_reloc, /* special_function */
59 "R_ARM_NONE", /* name */
60 FALSE, /* partial_inplace */
61 0, /* src_mask */
62 0, /* dst_mask */
63 FALSE), /* pcrel_offset */
64
65 HOWTO (R_ARM_PC24, /* type */
66 2, /* rightshift */
67 2, /* size (0 = byte, 1 = short, 2 = long) */
68 24, /* bitsize */
69 TRUE, /* pc_relative */
70 0, /* bitpos */
71 complain_overflow_signed,/* complain_on_overflow */
72 bfd_elf_generic_reloc, /* special_function */
73 "R_ARM_PC24", /* name */
74 FALSE, /* partial_inplace */
75 0x00ffffff, /* src_mask */
76 0x00ffffff, /* dst_mask */
77 TRUE), /* pcrel_offset */
78
79 /* 32 bit absolute */
80 HOWTO (R_ARM_ABS32, /* type */
81 0, /* rightshift */
82 2, /* size (0 = byte, 1 = short, 2 = long) */
83 32, /* bitsize */
84 FALSE, /* pc_relative */
85 0, /* bitpos */
86 complain_overflow_bitfield,/* complain_on_overflow */
87 bfd_elf_generic_reloc, /* special_function */
88 "R_ARM_ABS32", /* name */
89 FALSE, /* partial_inplace */
90 0xffffffff, /* src_mask */
91 0xffffffff, /* dst_mask */
92 FALSE), /* pcrel_offset */
93
94 /* standard 32bit pc-relative reloc */
95 HOWTO (R_ARM_REL32, /* type */
96 0, /* rightshift */
97 2, /* size (0 = byte, 1 = short, 2 = long) */
98 32, /* bitsize */
99 TRUE, /* pc_relative */
100 0, /* bitpos */
101 complain_overflow_bitfield,/* complain_on_overflow */
102 bfd_elf_generic_reloc, /* special_function */
103 "R_ARM_REL32", /* name */
104 FALSE, /* partial_inplace */
105 0xffffffff, /* src_mask */
106 0xffffffff, /* dst_mask */
107 TRUE), /* pcrel_offset */
108
109 /* 8 bit absolute */
110 HOWTO (R_ARM_PC13, /* type */
111 0, /* rightshift */
112 0, /* size (0 = byte, 1 = short, 2 = long) */
113 8, /* bitsize */
114 FALSE, /* pc_relative */
115 0, /* bitpos */
116 complain_overflow_bitfield,/* complain_on_overflow */
117 bfd_elf_generic_reloc, /* special_function */
118 "R_ARM_PC13", /* name */
119 FALSE, /* partial_inplace */
120 0x000000ff, /* src_mask */
121 0x000000ff, /* dst_mask */
122 FALSE), /* pcrel_offset */
123
124 /* 16 bit absolute */
125 HOWTO (R_ARM_ABS16, /* type */
126 0, /* rightshift */
127 1, /* size (0 = byte, 1 = short, 2 = long) */
128 16, /* bitsize */
129 FALSE, /* pc_relative */
130 0, /* bitpos */
131 complain_overflow_bitfield,/* complain_on_overflow */
132 bfd_elf_generic_reloc, /* special_function */
133 "R_ARM_ABS16", /* name */
134 FALSE, /* partial_inplace */
135 0x0000ffff, /* src_mask */
136 0x0000ffff, /* dst_mask */
137 FALSE), /* pcrel_offset */
138
139 /* 12 bit absolute */
140 HOWTO (R_ARM_ABS12, /* type */
141 0, /* rightshift */
142 2, /* size (0 = byte, 1 = short, 2 = long) */
143 12, /* bitsize */
144 FALSE, /* pc_relative */
145 0, /* bitpos */
146 complain_overflow_bitfield,/* complain_on_overflow */
147 bfd_elf_generic_reloc, /* special_function */
148 "R_ARM_ABS12", /* name */
149 FALSE, /* partial_inplace */
150 0x000008ff, /* src_mask */
151 0x000008ff, /* dst_mask */
152 FALSE), /* pcrel_offset */
153
154 HOWTO (R_ARM_THM_ABS5, /* type */
155 6, /* rightshift */
156 1, /* size (0 = byte, 1 = short, 2 = long) */
157 5, /* bitsize */
158 FALSE, /* pc_relative */
159 0, /* bitpos */
160 complain_overflow_bitfield,/* complain_on_overflow */
161 bfd_elf_generic_reloc, /* special_function */
162 "R_ARM_THM_ABS5", /* name */
163 FALSE, /* partial_inplace */
164 0x000007e0, /* src_mask */
165 0x000007e0, /* dst_mask */
166 FALSE), /* pcrel_offset */
167
168 /* 8 bit absolute */
169 HOWTO (R_ARM_ABS8, /* type */
170 0, /* rightshift */
171 0, /* size (0 = byte, 1 = short, 2 = long) */
172 8, /* bitsize */
173 FALSE, /* pc_relative */
174 0, /* bitpos */
175 complain_overflow_bitfield,/* complain_on_overflow */
176 bfd_elf_generic_reloc, /* special_function */
177 "R_ARM_ABS8", /* name */
178 FALSE, /* partial_inplace */
179 0x000000ff, /* src_mask */
180 0x000000ff, /* dst_mask */
181 FALSE), /* pcrel_offset */
182
183 HOWTO (R_ARM_SBREL32, /* type */
184 0, /* rightshift */
185 2, /* size (0 = byte, 1 = short, 2 = long) */
186 32, /* bitsize */
187 FALSE, /* pc_relative */
188 0, /* bitpos */
189 complain_overflow_dont,/* complain_on_overflow */
190 bfd_elf_generic_reloc, /* special_function */
191 "R_ARM_SBREL32", /* name */
192 FALSE, /* partial_inplace */
193 0xffffffff, /* src_mask */
194 0xffffffff, /* dst_mask */
195 FALSE), /* pcrel_offset */
196
197 HOWTO (R_ARM_THM_PC22, /* type */
198 1, /* rightshift */
199 2, /* size (0 = byte, 1 = short, 2 = long) */
200 23, /* bitsize */
201 TRUE, /* pc_relative */
202 0, /* bitpos */
203 complain_overflow_signed,/* complain_on_overflow */
204 bfd_elf_generic_reloc, /* special_function */
205 "R_ARM_THM_PC22", /* name */
206 FALSE, /* partial_inplace */
207 0x07ff07ff, /* src_mask */
208 0x07ff07ff, /* dst_mask */
209 TRUE), /* pcrel_offset */
210
211 HOWTO (R_ARM_THM_PC8, /* type */
212 1, /* rightshift */
213 1, /* size (0 = byte, 1 = short, 2 = long) */
214 8, /* bitsize */
215 TRUE, /* pc_relative */
216 0, /* bitpos */
217 complain_overflow_signed,/* complain_on_overflow */
218 bfd_elf_generic_reloc, /* special_function */
219 "R_ARM_THM_PC8", /* name */
220 FALSE, /* partial_inplace */
221 0x000000ff, /* src_mask */
222 0x000000ff, /* dst_mask */
223 TRUE), /* pcrel_offset */
224
225 HOWTO (R_ARM_AMP_VCALL9, /* type */
226 1, /* rightshift */
227 1, /* size (0 = byte, 1 = short, 2 = long) */
228 8, /* bitsize */
229 TRUE, /* pc_relative */
230 0, /* bitpos */
231 complain_overflow_signed,/* complain_on_overflow */
232 bfd_elf_generic_reloc, /* special_function */
233 "R_ARM_AMP_VCALL9", /* name */
234 FALSE, /* partial_inplace */
235 0x000000ff, /* src_mask */
236 0x000000ff, /* dst_mask */
237 TRUE), /* pcrel_offset */
238
239 HOWTO (R_ARM_SWI24, /* type */
240 0, /* rightshift */
241 0, /* size (0 = byte, 1 = short, 2 = long) */
242 0, /* bitsize */
243 FALSE, /* pc_relative */
244 0, /* bitpos */
245 complain_overflow_signed,/* complain_on_overflow */
246 bfd_elf_generic_reloc, /* special_function */
247 "R_ARM_SWI24", /* name */
248 FALSE, /* partial_inplace */
249 0x00000000, /* src_mask */
250 0x00000000, /* dst_mask */
251 FALSE), /* pcrel_offset */
252
253 HOWTO (R_ARM_THM_SWI8, /* type */
254 0, /* rightshift */
255 0, /* size (0 = byte, 1 = short, 2 = long) */
256 0, /* bitsize */
257 FALSE, /* pc_relative */
258 0, /* bitpos */
259 complain_overflow_signed,/* complain_on_overflow */
260 bfd_elf_generic_reloc, /* special_function */
261 "R_ARM_SWI8", /* name */
262 FALSE, /* partial_inplace */
263 0x00000000, /* src_mask */
264 0x00000000, /* dst_mask */
265 FALSE), /* pcrel_offset */
266
267 /* BLX instruction for the ARM. */
268 HOWTO (R_ARM_XPC25, /* type */
269 2, /* rightshift */
270 2, /* size (0 = byte, 1 = short, 2 = long) */
271 25, /* bitsize */
272 TRUE, /* pc_relative */
273 0, /* bitpos */
274 complain_overflow_signed,/* complain_on_overflow */
275 bfd_elf_generic_reloc, /* special_function */
276 "R_ARM_XPC25", /* name */
277 FALSE, /* partial_inplace */
278 0x00ffffff, /* src_mask */
279 0x00ffffff, /* dst_mask */
280 TRUE), /* pcrel_offset */
281
282 /* BLX instruction for the Thumb. */
283 HOWTO (R_ARM_THM_XPC22, /* type */
284 2, /* rightshift */
285 2, /* size (0 = byte, 1 = short, 2 = long) */
286 22, /* bitsize */
287 TRUE, /* pc_relative */
288 0, /* bitpos */
289 complain_overflow_signed,/* complain_on_overflow */
290 bfd_elf_generic_reloc, /* special_function */
291 "R_ARM_THM_XPC22", /* name */
292 FALSE, /* partial_inplace */
293 0x07ff07ff, /* src_mask */
294 0x07ff07ff, /* dst_mask */
295 TRUE), /* pcrel_offset */
296
297 /* These next three relocs are not defined, but we need to fill the space. */
298
299 HOWTO (R_ARM_NONE, /* type */
300 0, /* rightshift */
301 0, /* size (0 = byte, 1 = short, 2 = long) */
302 0, /* bitsize */
303 FALSE, /* pc_relative */
304 0, /* bitpos */
305 complain_overflow_dont,/* complain_on_overflow */
306 bfd_elf_generic_reloc, /* special_function */
307 "R_ARM_unknown_17", /* name */
308 FALSE, /* partial_inplace */
309 0, /* src_mask */
310 0, /* dst_mask */
311 FALSE), /* pcrel_offset */
312
313 HOWTO (R_ARM_NONE, /* type */
314 0, /* rightshift */
315 0, /* size (0 = byte, 1 = short, 2 = long) */
316 0, /* bitsize */
317 FALSE, /* pc_relative */
318 0, /* bitpos */
319 complain_overflow_dont,/* complain_on_overflow */
320 bfd_elf_generic_reloc, /* special_function */
321 "R_ARM_unknown_18", /* name */
322 FALSE, /* partial_inplace */
323 0, /* src_mask */
324 0, /* dst_mask */
325 FALSE), /* pcrel_offset */
326
327 HOWTO (R_ARM_NONE, /* type */
328 0, /* rightshift */
329 0, /* size (0 = byte, 1 = short, 2 = long) */
330 0, /* bitsize */
331 FALSE, /* pc_relative */
332 0, /* bitpos */
333 complain_overflow_dont,/* complain_on_overflow */
334 bfd_elf_generic_reloc, /* special_function */
335 "R_ARM_unknown_19", /* name */
336 FALSE, /* partial_inplace */
337 0, /* src_mask */
338 0, /* dst_mask */
339 FALSE), /* pcrel_offset */
340
341 /* Relocs used in ARM Linux */
342
343 HOWTO (R_ARM_COPY, /* type */
344 0, /* rightshift */
345 2, /* size (0 = byte, 1 = short, 2 = long) */
346 32, /* bitsize */
347 FALSE, /* pc_relative */
348 0, /* bitpos */
349 complain_overflow_bitfield,/* complain_on_overflow */
350 bfd_elf_generic_reloc, /* special_function */
351 "R_ARM_COPY", /* name */
352 TRUE, /* partial_inplace */
353 0xffffffff, /* src_mask */
354 0xffffffff, /* dst_mask */
355 FALSE), /* pcrel_offset */
356
357 HOWTO (R_ARM_GLOB_DAT, /* type */
358 0, /* rightshift */
359 2, /* size (0 = byte, 1 = short, 2 = long) */
360 32, /* bitsize */
361 FALSE, /* pc_relative */
362 0, /* bitpos */
363 complain_overflow_bitfield,/* complain_on_overflow */
364 bfd_elf_generic_reloc, /* special_function */
365 "R_ARM_GLOB_DAT", /* name */
366 TRUE, /* partial_inplace */
367 0xffffffff, /* src_mask */
368 0xffffffff, /* dst_mask */
369 FALSE), /* pcrel_offset */
370
371 HOWTO (R_ARM_JUMP_SLOT, /* type */
372 0, /* rightshift */
373 2, /* size (0 = byte, 1 = short, 2 = long) */
374 32, /* bitsize */
375 FALSE, /* pc_relative */
376 0, /* bitpos */
377 complain_overflow_bitfield,/* complain_on_overflow */
378 bfd_elf_generic_reloc, /* special_function */
379 "R_ARM_JUMP_SLOT", /* name */
380 TRUE, /* partial_inplace */
381 0xffffffff, /* src_mask */
382 0xffffffff, /* dst_mask */
383 FALSE), /* pcrel_offset */
384
385 HOWTO (R_ARM_RELATIVE, /* type */
386 0, /* rightshift */
387 2, /* size (0 = byte, 1 = short, 2 = long) */
388 32, /* bitsize */
389 FALSE, /* pc_relative */
390 0, /* bitpos */
391 complain_overflow_bitfield,/* complain_on_overflow */
392 bfd_elf_generic_reloc, /* special_function */
393 "R_ARM_RELATIVE", /* name */
394 TRUE, /* partial_inplace */
395 0xffffffff, /* src_mask */
396 0xffffffff, /* dst_mask */
397 FALSE), /* pcrel_offset */
398
399 HOWTO (R_ARM_GOTOFF, /* type */
400 0, /* rightshift */
401 2, /* size (0 = byte, 1 = short, 2 = long) */
402 32, /* bitsize */
403 FALSE, /* pc_relative */
404 0, /* bitpos */
405 complain_overflow_bitfield,/* complain_on_overflow */
406 bfd_elf_generic_reloc, /* special_function */
407 "R_ARM_GOTOFF", /* name */
408 TRUE, /* partial_inplace */
409 0xffffffff, /* src_mask */
410 0xffffffff, /* dst_mask */
411 FALSE), /* pcrel_offset */
412
413 HOWTO (R_ARM_GOTPC, /* type */
414 0, /* rightshift */
415 2, /* size (0 = byte, 1 = short, 2 = long) */
416 32, /* bitsize */
417 TRUE, /* pc_relative */
418 0, /* bitpos */
419 complain_overflow_bitfield,/* complain_on_overflow */
420 bfd_elf_generic_reloc, /* special_function */
421 "R_ARM_GOTPC", /* name */
422 TRUE, /* partial_inplace */
423 0xffffffff, /* src_mask */
424 0xffffffff, /* dst_mask */
425 TRUE), /* pcrel_offset */
426
427 HOWTO (R_ARM_GOT32, /* type */
428 0, /* rightshift */
429 2, /* size (0 = byte, 1 = short, 2 = long) */
430 32, /* bitsize */
431 FALSE, /* pc_relative */
432 0, /* bitpos */
433 complain_overflow_bitfield,/* complain_on_overflow */
434 bfd_elf_generic_reloc, /* special_function */
435 "R_ARM_GOT32", /* name */
436 TRUE, /* partial_inplace */
437 0xffffffff, /* src_mask */
438 0xffffffff, /* dst_mask */
439 FALSE), /* pcrel_offset */
440
441 HOWTO (R_ARM_PLT32, /* type */
442 2, /* rightshift */
443 2, /* size (0 = byte, 1 = short, 2 = long) */
444 26, /* bitsize */
445 TRUE, /* pc_relative */
446 0, /* bitpos */
447 complain_overflow_bitfield,/* complain_on_overflow */
448 bfd_elf_generic_reloc, /* special_function */
449 "R_ARM_PLT32", /* name */
450 TRUE, /* partial_inplace */
451 0x00ffffff, /* src_mask */
452 0x00ffffff, /* dst_mask */
453 TRUE), /* pcrel_offset */
454
455 HOWTO (R_ARM_CALL, /* type */
456 2, /* rightshift */
457 2, /* size (0 = byte, 1 = short, 2 = long) */
458 24, /* bitsize */
459 TRUE, /* pc_relative */
460 0, /* bitpos */
461 complain_overflow_signed,/* complain_on_overflow */
462 bfd_elf_generic_reloc, /* special_function */
463 "R_ARM_CALL", /* name */
464 FALSE, /* partial_inplace */
465 0x00ffffff, /* src_mask */
466 0x00ffffff, /* dst_mask */
467 TRUE), /* pcrel_offset */
468
469 HOWTO (R_ARM_JUMP24, /* type */
470 2, /* rightshift */
471 2, /* size (0 = byte, 1 = short, 2 = long) */
472 24, /* bitsize */
473 TRUE, /* pc_relative */
474 0, /* bitpos */
475 complain_overflow_signed,/* complain_on_overflow */
476 bfd_elf_generic_reloc, /* special_function */
477 "R_ARM_JUMP24", /* name */
478 FALSE, /* partial_inplace */
479 0x00ffffff, /* src_mask */
480 0x00ffffff, /* dst_mask */
481 TRUE), /* pcrel_offset */
482
483 HOWTO (R_ARM_NONE, /* type */
484 0, /* rightshift */
485 0, /* size (0 = byte, 1 = short, 2 = long) */
486 0, /* bitsize */
487 FALSE, /* pc_relative */
488 0, /* bitpos */
489 complain_overflow_dont,/* complain_on_overflow */
490 bfd_elf_generic_reloc, /* special_function */
491 "R_ARM_unknown_30", /* name */
492 FALSE, /* partial_inplace */
493 0, /* src_mask */
494 0, /* dst_mask */
495 FALSE), /* pcrel_offset */
496
497 HOWTO (R_ARM_NONE, /* type */
498 0, /* rightshift */
499 0, /* size (0 = byte, 1 = short, 2 = long) */
500 0, /* bitsize */
501 FALSE, /* pc_relative */
502 0, /* bitpos */
503 complain_overflow_dont,/* complain_on_overflow */
504 bfd_elf_generic_reloc, /* special_function */
505 "R_ARM_unknown_31", /* name */
506 FALSE, /* partial_inplace */
507 0, /* src_mask */
508 0, /* dst_mask */
509 FALSE), /* pcrel_offset */
510
511 HOWTO (R_ARM_ALU_PCREL7_0, /* type */
512 0, /* rightshift */
513 2, /* size (0 = byte, 1 = short, 2 = long) */
514 12, /* bitsize */
515 TRUE, /* pc_relative */
516 0, /* bitpos */
517 complain_overflow_dont,/* complain_on_overflow */
518 bfd_elf_generic_reloc, /* special_function */
519 "R_ARM_ALU_PCREL_7_0", /* name */
520 FALSE, /* partial_inplace */
521 0x00000fff, /* src_mask */
522 0x00000fff, /* dst_mask */
523 TRUE), /* pcrel_offset */
524
525 HOWTO (R_ARM_ALU_PCREL15_8, /* type */
526 0, /* rightshift */
527 2, /* size (0 = byte, 1 = short, 2 = long) */
528 12, /* bitsize */
529 TRUE, /* pc_relative */
530 8, /* bitpos */
531 complain_overflow_dont,/* complain_on_overflow */
532 bfd_elf_generic_reloc, /* special_function */
533 "R_ARM_ALU_PCREL_15_8",/* name */
534 FALSE, /* partial_inplace */
535 0x00000fff, /* src_mask */
536 0x00000fff, /* dst_mask */
537 TRUE), /* pcrel_offset */
538
539 HOWTO (R_ARM_ALU_PCREL23_15, /* type */
540 0, /* rightshift */
541 2, /* size (0 = byte, 1 = short, 2 = long) */
542 12, /* bitsize */
543 TRUE, /* pc_relative */
544 16, /* bitpos */
545 complain_overflow_dont,/* complain_on_overflow */
546 bfd_elf_generic_reloc, /* special_function */
547 "R_ARM_ALU_PCREL_23_15",/* name */
548 FALSE, /* partial_inplace */
549 0x00000fff, /* src_mask */
550 0x00000fff, /* dst_mask */
551 TRUE), /* pcrel_offset */
552
553 HOWTO (R_ARM_LDR_SBREL_11_0, /* type */
554 0, /* rightshift */
555 2, /* size (0 = byte, 1 = short, 2 = long) */
556 12, /* bitsize */
557 FALSE, /* pc_relative */
558 0, /* bitpos */
559 complain_overflow_dont,/* complain_on_overflow */
560 bfd_elf_generic_reloc, /* special_function */
561 "R_ARM_LDR_SBREL_11_0",/* name */
562 FALSE, /* partial_inplace */
563 0x00000fff, /* src_mask */
564 0x00000fff, /* dst_mask */
565 FALSE), /* pcrel_offset */
566
567 HOWTO (R_ARM_ALU_SBREL_19_12, /* type */
568 0, /* rightshift */
569 2, /* size (0 = byte, 1 = short, 2 = long) */
570 8, /* bitsize */
571 FALSE, /* pc_relative */
572 12, /* bitpos */
573 complain_overflow_dont,/* complain_on_overflow */
574 bfd_elf_generic_reloc, /* special_function */
575 "R_ARM_ALU_SBREL_19_12",/* name */
576 FALSE, /* partial_inplace */
577 0x000ff000, /* src_mask */
578 0x000ff000, /* dst_mask */
579 FALSE), /* pcrel_offset */
580
581 HOWTO (R_ARM_ALU_SBREL_27_20, /* type */
582 0, /* rightshift */
583 2, /* size (0 = byte, 1 = short, 2 = long) */
584 8, /* bitsize */
585 FALSE, /* pc_relative */
586 20, /* bitpos */
587 complain_overflow_dont,/* complain_on_overflow */
588 bfd_elf_generic_reloc, /* special_function */
589 "R_ARM_ALU_SBREL_27_20",/* name */
590 FALSE, /* partial_inplace */
591 0x0ff00000, /* src_mask */
592 0x0ff00000, /* dst_mask */
593 FALSE), /* pcrel_offset */
594
595 HOWTO (R_ARM_TARGET1, /* type */
596 0, /* rightshift */
597 2, /* size (0 = byte, 1 = short, 2 = long) */
598 32, /* bitsize */
599 FALSE, /* pc_relative */
600 0, /* bitpos */
601 complain_overflow_dont,/* complain_on_overflow */
602 bfd_elf_generic_reloc, /* special_function */
603 "R_ARM_TARGET1", /* name */
604 FALSE, /* partial_inplace */
605 0xffffffff, /* src_mask */
606 0xffffffff, /* dst_mask */
607 FALSE), /* pcrel_offset */
608
609 HOWTO (R_ARM_ROSEGREL32, /* type */
610 0, /* rightshift */
611 2, /* size (0 = byte, 1 = short, 2 = long) */
612 32, /* bitsize */
613 FALSE, /* pc_relative */
614 0, /* bitpos */
615 complain_overflow_dont,/* complain_on_overflow */
616 bfd_elf_generic_reloc, /* special_function */
617 "R_ARM_ROSEGREL32", /* name */
618 FALSE, /* partial_inplace */
619 0xffffffff, /* src_mask */
620 0xffffffff, /* dst_mask */
621 FALSE), /* pcrel_offset */
622
623 HOWTO (R_ARM_V4BX, /* type */
624 0, /* rightshift */
625 2, /* size (0 = byte, 1 = short, 2 = long) */
626 32, /* bitsize */
627 FALSE, /* pc_relative */
628 0, /* bitpos */
629 complain_overflow_dont,/* complain_on_overflow */
630 bfd_elf_generic_reloc, /* special_function */
631 "R_ARM_V4BX", /* name */
632 FALSE, /* partial_inplace */
633 0xffffffff, /* src_mask */
634 0xffffffff, /* dst_mask */
635 FALSE), /* pcrel_offset */
636
637 HOWTO (R_ARM_TARGET2, /* type */
638 0, /* rightshift */
639 2, /* size (0 = byte, 1 = short, 2 = long) */
640 32, /* bitsize */
641 FALSE, /* pc_relative */
642 0, /* bitpos */
643 complain_overflow_signed,/* complain_on_overflow */
644 bfd_elf_generic_reloc, /* special_function */
645 "R_ARM_TARGET2", /* name */
646 FALSE, /* partial_inplace */
647 0xffffffff, /* src_mask */
648 0xffffffff, /* dst_mask */
649 TRUE), /* pcrel_offset */
650
651 HOWTO (R_ARM_PREL31, /* type */
652 0, /* rightshift */
653 2, /* size (0 = byte, 1 = short, 2 = long) */
654 31, /* bitsize */
655 TRUE, /* pc_relative */
656 0, /* bitpos */
657 complain_overflow_signed,/* complain_on_overflow */
658 bfd_elf_generic_reloc, /* special_function */
659 "R_ARM_PREL31", /* name */
660 FALSE, /* partial_inplace */
661 0x7fffffff, /* src_mask */
662 0x7fffffff, /* dst_mask */
663 TRUE), /* pcrel_offset */
664 };
665
666 /* GNU extension to record C++ vtable hierarchy */
667 static reloc_howto_type elf32_arm_vtinherit_howto =
668 HOWTO (R_ARM_GNU_VTINHERIT, /* type */
669 0, /* rightshift */
670 2, /* size (0 = byte, 1 = short, 2 = long) */
671 0, /* bitsize */
672 FALSE, /* pc_relative */
673 0, /* bitpos */
674 complain_overflow_dont, /* complain_on_overflow */
675 NULL, /* special_function */
676 "R_ARM_GNU_VTINHERIT", /* name */
677 FALSE, /* partial_inplace */
678 0, /* src_mask */
679 0, /* dst_mask */
680 FALSE); /* pcrel_offset */
681
682 /* GNU extension to record C++ vtable member usage */
683 static reloc_howto_type elf32_arm_vtentry_howto =
684 HOWTO (R_ARM_GNU_VTENTRY, /* type */
685 0, /* rightshift */
686 2, /* size (0 = byte, 1 = short, 2 = long) */
687 0, /* bitsize */
688 FALSE, /* pc_relative */
689 0, /* bitpos */
690 complain_overflow_dont, /* complain_on_overflow */
691 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
692 "R_ARM_GNU_VTENTRY", /* name */
693 FALSE, /* partial_inplace */
694 0, /* src_mask */
695 0, /* dst_mask */
696 FALSE); /* pcrel_offset */
697
698 /* 12 bit pc relative */
699 static reloc_howto_type elf32_arm_thm_pc11_howto =
700 HOWTO (R_ARM_THM_PC11, /* type */
701 1, /* rightshift */
702 1, /* size (0 = byte, 1 = short, 2 = long) */
703 11, /* bitsize */
704 TRUE, /* pc_relative */
705 0, /* bitpos */
706 complain_overflow_signed, /* complain_on_overflow */
707 bfd_elf_generic_reloc, /* special_function */
708 "R_ARM_THM_PC11", /* name */
709 FALSE, /* partial_inplace */
710 0x000007ff, /* src_mask */
711 0x000007ff, /* dst_mask */
712 TRUE); /* pcrel_offset */
713
714 /* 12 bit pc relative */
715 static reloc_howto_type elf32_arm_thm_pc9_howto =
716 HOWTO (R_ARM_THM_PC9, /* type */
717 1, /* rightshift */
718 1, /* size (0 = byte, 1 = short, 2 = long) */
719 8, /* bitsize */
720 TRUE, /* pc_relative */
721 0, /* bitpos */
722 complain_overflow_signed, /* complain_on_overflow */
723 bfd_elf_generic_reloc, /* special_function */
724 "R_ARM_THM_PC9", /* name */
725 FALSE, /* partial_inplace */
726 0x000000ff, /* src_mask */
727 0x000000ff, /* dst_mask */
728 TRUE); /* pcrel_offset */
729
730 /* Place relative GOT-indirect. */
731 static reloc_howto_type elf32_arm_got_prel =
732 HOWTO (R_ARM_GOT_PREL, /* type */
733 0, /* rightshift */
734 2, /* size (0 = byte, 1 = short, 2 = long) */
735 32, /* bitsize */
736 TRUE, /* pc_relative */
737 0, /* bitpos */
738 complain_overflow_dont, /* complain_on_overflow */
739 bfd_elf_generic_reloc, /* special_function */
740 "R_ARM_GOT_PREL", /* name */
741 FALSE, /* partial_inplace */
742 0xffffffff, /* src_mask */
743 0xffffffff, /* dst_mask */
744 TRUE); /* pcrel_offset */
745
746 /* Currently unused relocations. */
747 static reloc_howto_type elf32_arm_r_howto[4] =
748 {
749 HOWTO (R_ARM_RREL32, /* type */
750 0, /* rightshift */
751 0, /* size (0 = byte, 1 = short, 2 = long) */
752 0, /* bitsize */
753 FALSE, /* pc_relative */
754 0, /* bitpos */
755 complain_overflow_dont,/* complain_on_overflow */
756 bfd_elf_generic_reloc, /* special_function */
757 "R_ARM_RREL32", /* name */
758 FALSE, /* partial_inplace */
759 0, /* src_mask */
760 0, /* dst_mask */
761 FALSE), /* pcrel_offset */
762
763 HOWTO (R_ARM_RABS32, /* type */
764 0, /* rightshift */
765 0, /* size (0 = byte, 1 = short, 2 = long) */
766 0, /* bitsize */
767 FALSE, /* pc_relative */
768 0, /* bitpos */
769 complain_overflow_dont,/* complain_on_overflow */
770 bfd_elf_generic_reloc, /* special_function */
771 "R_ARM_RABS32", /* name */
772 FALSE, /* partial_inplace */
773 0, /* src_mask */
774 0, /* dst_mask */
775 FALSE), /* pcrel_offset */
776
777 HOWTO (R_ARM_RPC24, /* type */
778 0, /* rightshift */
779 0, /* size (0 = byte, 1 = short, 2 = long) */
780 0, /* bitsize */
781 FALSE, /* pc_relative */
782 0, /* bitpos */
783 complain_overflow_dont,/* complain_on_overflow */
784 bfd_elf_generic_reloc, /* special_function */
785 "R_ARM_RPC24", /* name */
786 FALSE, /* partial_inplace */
787 0, /* src_mask */
788 0, /* dst_mask */
789 FALSE), /* pcrel_offset */
790
791 HOWTO (R_ARM_RBASE, /* type */
792 0, /* rightshift */
793 0, /* size (0 = byte, 1 = short, 2 = long) */
794 0, /* bitsize */
795 FALSE, /* pc_relative */
796 0, /* bitpos */
797 complain_overflow_dont,/* complain_on_overflow */
798 bfd_elf_generic_reloc, /* special_function */
799 "R_ARM_RBASE", /* name */
800 FALSE, /* partial_inplace */
801 0, /* src_mask */
802 0, /* dst_mask */
803 FALSE) /* pcrel_offset */
804 };
805
806 static reloc_howto_type *
807 elf32_arm_howto_from_type (unsigned int r_type)
808 {
809 if (r_type < NUM_ELEM (elf32_arm_howto_table))
810 return &elf32_arm_howto_table[r_type];
811
812 switch (r_type)
813 {
814 case R_ARM_GOT_PREL:
815 return &elf32_arm_got_prel;
816
817 case R_ARM_GNU_VTINHERIT:
818 return &elf32_arm_vtinherit_howto;
819
820 case R_ARM_GNU_VTENTRY:
821 return &elf32_arm_vtentry_howto;
822
823 case R_ARM_THM_PC11:
824 return &elf32_arm_thm_pc11_howto;
825
826 case R_ARM_THM_PC9:
827 return &elf32_arm_thm_pc9_howto;
828
829 case R_ARM_RREL32:
830 case R_ARM_RABS32:
831 case R_ARM_RPC24:
832 case R_ARM_RBASE:
833 return &elf32_arm_r_howto[r_type - R_ARM_RREL32];
834
835 default:
836 return NULL;
837 }
838 }
839
840 static void
841 elf32_arm_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED, arelent * bfd_reloc,
842 Elf_Internal_Rela * elf_reloc)
843 {
844 unsigned int r_type;
845
846 r_type = ELF32_R_TYPE (elf_reloc->r_info);
847 bfd_reloc->howto = elf32_arm_howto_from_type (r_type);
848 }
849
850 struct elf32_arm_reloc_map
851 {
852 bfd_reloc_code_real_type bfd_reloc_val;
853 unsigned char elf_reloc_val;
854 };
855
856 /* All entries in this list must also be present in elf32_arm_howto_table. */
857 static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
858 {
859 {BFD_RELOC_NONE, R_ARM_NONE},
860 {BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24},
861 {BFD_RELOC_ARM_PCREL_BLX, R_ARM_XPC25},
862 {BFD_RELOC_THUMB_PCREL_BLX, R_ARM_THM_XPC22},
863 {BFD_RELOC_32, R_ARM_ABS32},
864 {BFD_RELOC_32_PCREL, R_ARM_REL32},
865 {BFD_RELOC_8, R_ARM_ABS8},
866 {BFD_RELOC_16, R_ARM_ABS16},
867 {BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12},
868 {BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5},
869 {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22},
870 {BFD_RELOC_ARM_COPY, R_ARM_COPY},
871 {BFD_RELOC_ARM_GLOB_DAT, R_ARM_GLOB_DAT},
872 {BFD_RELOC_ARM_JUMP_SLOT, R_ARM_JUMP_SLOT},
873 {BFD_RELOC_ARM_RELATIVE, R_ARM_RELATIVE},
874 {BFD_RELOC_ARM_GOTOFF, R_ARM_GOTOFF},
875 {BFD_RELOC_ARM_GOTPC, R_ARM_GOTPC},
876 {BFD_RELOC_ARM_GOT32, R_ARM_GOT32},
877 {BFD_RELOC_ARM_PLT32, R_ARM_PLT32},
878 {BFD_RELOC_ARM_TARGET1, R_ARM_TARGET1},
879 {BFD_RELOC_ARM_ROSEGREL32, R_ARM_ROSEGREL32},
880 {BFD_RELOC_ARM_SBREL32, R_ARM_SBREL32},
881 {BFD_RELOC_ARM_PREL31, R_ARM_PREL31},
882 {BFD_RELOC_ARM_TARGET2, R_ARM_TARGET2}
883 };
884
885 static reloc_howto_type *
886 elf32_arm_reloc_type_lookup (abfd, code)
887 bfd *abfd ATTRIBUTE_UNUSED;
888 bfd_reloc_code_real_type code;
889 {
890 unsigned int i;
891
892 switch (code)
893 {
894 case BFD_RELOC_VTABLE_INHERIT:
895 return & elf32_arm_vtinherit_howto;
896
897 case BFD_RELOC_VTABLE_ENTRY:
898 return & elf32_arm_vtentry_howto;
899
900 case BFD_RELOC_THUMB_PCREL_BRANCH12:
901 return & elf32_arm_thm_pc11_howto;
902
903 case BFD_RELOC_THUMB_PCREL_BRANCH9:
904 return & elf32_arm_thm_pc9_howto;
905
906 default:
907 for (i = 0; i < NUM_ELEM (elf32_arm_reloc_map); i ++)
908 if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
909 return & elf32_arm_howto_table[elf32_arm_reloc_map[i].elf_reloc_val];
910
911 return NULL;
912 }
913 }
914
915 /* Support for core dump NOTE sections */
916 static bfd_boolean
917 elf32_arm_nabi_grok_prstatus (abfd, note)
918 bfd *abfd;
919 Elf_Internal_Note *note;
920 {
921 int offset;
922 size_t size;
923
924 switch (note->descsz)
925 {
926 default:
927 return FALSE;
928
929 case 148: /* Linux/ARM 32-bit*/
930 /* pr_cursig */
931 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
932
933 /* pr_pid */
934 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
935
936 /* pr_reg */
937 offset = 72;
938 size = 72;
939
940 break;
941 }
942
943 /* Make a ".reg/999" section. */
944 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
945 size, note->descpos + offset);
946 }
947
948 static bfd_boolean
949 elf32_arm_nabi_grok_psinfo (abfd, note)
950 bfd *abfd;
951 Elf_Internal_Note *note;
952 {
953 switch (note->descsz)
954 {
955 default:
956 return FALSE;
957
958 case 124: /* Linux/ARM elf_prpsinfo */
959 elf_tdata (abfd)->core_program
960 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
961 elf_tdata (abfd)->core_command
962 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
963 }
964
965 /* Note that for some reason, a spurious space is tacked
966 onto the end of the args in some (at least one anyway)
967 implementations, so strip it off if it exists. */
968
969 {
970 char *command = elf_tdata (abfd)->core_command;
971 int n = strlen (command);
972
973 if (0 < n && command[n - 1] == ' ')
974 command[n - 1] = '\0';
975 }
976
977 return TRUE;
978 }
979
980 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_vec
981 #define TARGET_LITTLE_NAME "elf32-littlearm"
982 #define TARGET_BIG_SYM bfd_elf32_bigarm_vec
983 #define TARGET_BIG_NAME "elf32-bigarm"
984
985 #define elf_backend_grok_prstatus elf32_arm_nabi_grok_prstatus
986 #define elf_backend_grok_psinfo elf32_arm_nabi_grok_psinfo
987
988 typedef unsigned long int insn32;
989 typedef unsigned short int insn16;
990
991 /* In lieu of proper flags, assume all EABIv4 objects are interworkable. */
992 #define INTERWORK_FLAG(abfd) \
993 (EF_ARM_EABI_VERSION (elf_elfheader (abfd)->e_flags) == EF_ARM_EABI_VER4 \
994 || (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK))
995
996 /* The linker script knows the section names for placement.
997 The entry_names are used to do simple name mangling on the stubs.
998 Given a function name, and its type, the stub can be found. The
999 name can be changed. The only requirement is the %s be present. */
1000 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
1001 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
1002
1003 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
1004 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
1005
1006 /* The name of the dynamic interpreter. This is put in the .interp
1007 section. */
1008 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
1009
1010 #ifdef FOUR_WORD_PLT
1011
1012 /* The first entry in a procedure linkage table looks like
1013 this. It is set up so that any shared library function that is
1014 called before the relocation has been set up calls the dynamic
1015 linker first. */
1016 static const bfd_vma elf32_arm_plt0_entry [] =
1017 {
1018 0xe52de004, /* str lr, [sp, #-4]! */
1019 0xe59fe010, /* ldr lr, [pc, #16] */
1020 0xe08fe00e, /* add lr, pc, lr */
1021 0xe5bef008, /* ldr pc, [lr, #8]! */
1022 };
1023
1024 /* Subsequent entries in a procedure linkage table look like
1025 this. */
1026 static const bfd_vma elf32_arm_plt_entry [] =
1027 {
1028 0xe28fc600, /* add ip, pc, #NN */
1029 0xe28cca00, /* add ip, ip, #NN */
1030 0xe5bcf000, /* ldr pc, [ip, #NN]! */
1031 0x00000000, /* unused */
1032 };
1033
1034 #else
1035
1036 /* The first entry in a procedure linkage table looks like
1037 this. It is set up so that any shared library function that is
1038 called before the relocation has been set up calls the dynamic
1039 linker first. */
1040 static const bfd_vma elf32_arm_plt0_entry [] =
1041 {
1042 0xe52de004, /* str lr, [sp, #-4]! */
1043 0xe59fe004, /* ldr lr, [pc, #4] */
1044 0xe08fe00e, /* add lr, pc, lr */
1045 0xe5bef008, /* ldr pc, [lr, #8]! */
1046 0x00000000, /* &GOT[0] - . */
1047 };
1048
1049 /* Subsequent entries in a procedure linkage table look like
1050 this. */
1051 static const bfd_vma elf32_arm_plt_entry [] =
1052 {
1053 0xe28fc600, /* add ip, pc, #0xNN00000 */
1054 0xe28cca00, /* add ip, ip, #0xNN000 */
1055 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */
1056 };
1057
1058 #endif
1059
1060 /* An initial stub used if the PLT entry is referenced from Thumb code. */
1061 #define PLT_THUMB_STUB_SIZE 4
1062 static const bfd_vma elf32_arm_plt_thumb_stub [] =
1063 {
1064 0x4778, /* bx pc */
1065 0x46c0 /* nop */
1066 };
1067
1068 /* The entries in a PLT when using a DLL-based target with multiple
1069 address spaces. */
1070 static const bfd_vma elf32_arm_symbian_plt_entry [] =
1071 {
1072 0xe51ff004, /* ldr pc, [pc, #-4] */
1073 0x00000000, /* dcd R_ARM_GLOB_DAT(X) */
1074 };
1075
1076 /* Used to build a map of a section. This is required for mixed-endian
1077 code/data. */
1078
1079 typedef struct elf32_elf_section_map
1080 {
1081 bfd_vma vma;
1082 char type;
1083 }
1084 elf32_arm_section_map;
1085
1086 struct _arm_elf_section_data
1087 {
1088 struct bfd_elf_section_data elf;
1089 int mapcount;
1090 elf32_arm_section_map *map;
1091 };
1092
1093 #define elf32_arm_section_data(sec) \
1094 ((struct _arm_elf_section_data *) elf_section_data (sec))
1095
1096 /* The ARM linker needs to keep track of the number of relocs that it
1097 decides to copy in check_relocs for each symbol. This is so that
1098 it can discard PC relative relocs if it doesn't need them when
1099 linking with -Bsymbolic. We store the information in a field
1100 extending the regular ELF linker hash table. */
1101
1102 /* This structure keeps track of the number of PC relative relocs we
1103 have copied for a given symbol. */
1104 struct elf32_arm_relocs_copied
1105 {
1106 /* Next section. */
1107 struct elf32_arm_relocs_copied * next;
1108 /* A section in dynobj. */
1109 asection * section;
1110 /* Number of relocs copied in this section. */
1111 bfd_size_type count;
1112 };
1113
1114 /* Arm ELF linker hash entry. */
1115 struct elf32_arm_link_hash_entry
1116 {
1117 struct elf_link_hash_entry root;
1118
1119 /* Number of PC relative relocs copied for this symbol. */
1120 struct elf32_arm_relocs_copied * relocs_copied;
1121
1122 /* We reference count Thumb references to a PLT entry separately,
1123 so that we can emit the Thumb trampoline only if needed. */
1124 bfd_signed_vma plt_thumb_refcount;
1125
1126 /* Since PLT entries have variable size if the Thumb prologue is
1127 used, we need to record the index into .got.plt instead of
1128 recomputing it from the PLT offset. */
1129 bfd_signed_vma plt_got_offset;
1130 };
1131
1132 /* Traverse an arm ELF linker hash table. */
1133 #define elf32_arm_link_hash_traverse(table, func, info) \
1134 (elf_link_hash_traverse \
1135 (&(table)->root, \
1136 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
1137 (info)))
1138
1139 /* Get the ARM elf linker hash table from a link_info structure. */
1140 #define elf32_arm_hash_table(info) \
1141 ((struct elf32_arm_link_hash_table *) ((info)->hash))
1142
1143 /* ARM ELF linker hash table. */
1144 struct elf32_arm_link_hash_table
1145 {
1146 /* The main hash table. */
1147 struct elf_link_hash_table root;
1148
1149 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
1150 bfd_size_type thumb_glue_size;
1151
1152 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
1153 bfd_size_type arm_glue_size;
1154
1155 /* An arbitrary input BFD chosen to hold the glue sections. */
1156 bfd * bfd_of_glue_owner;
1157
1158 /* Nonzero to output a BE8 image. */
1159 int byteswap_code;
1160
1161 /* Zero if R_ARM_TARGET1 means R_ARM_ABS32.
1162 Nonzero if R_ARM_TARGET1 means R_ARM_ABS32. */
1163 int target1_is_rel;
1164
1165 /* The relocation to use for R_ARM_TARGET2 relocations. */
1166 int target2_reloc;
1167
1168 /* Nonzero to fix BX instructions for ARMv4 targets. */
1169 int fix_v4bx;
1170
1171 /* The number of bytes in the initial entry in the PLT. */
1172 bfd_size_type plt_header_size;
1173
1174 /* The number of bytes in the subsequent PLT etries. */
1175 bfd_size_type plt_entry_size;
1176
1177 /* True if the target system is Symbian OS. */
1178 int symbian_p;
1179
1180 /* True if the target uses REL relocations. */
1181 int use_rel;
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->use_rel = 1;
1393 ret->sym_sec.abfd = NULL;
1394 ret->obfd = abfd;
1395
1396 return &ret->root.root;
1397 }
1398
1399 /* Locate the Thumb encoded calling stub for NAME. */
1400
1401 static struct elf_link_hash_entry *
1402 find_thumb_glue (struct bfd_link_info *link_info,
1403 const char *name,
1404 bfd *input_bfd)
1405 {
1406 char *tmp_name;
1407 struct elf_link_hash_entry *hash;
1408 struct elf32_arm_link_hash_table *hash_table;
1409
1410 /* We need a pointer to the armelf specific hash table. */
1411 hash_table = elf32_arm_hash_table (link_info);
1412
1413 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1414 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1415
1416 BFD_ASSERT (tmp_name);
1417
1418 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1419
1420 hash = elf_link_hash_lookup
1421 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1422
1423 if (hash == NULL)
1424 /* xgettext:c-format */
1425 (*_bfd_error_handler) (_("%B: unable to find THUMB glue '%s' for `%s'"),
1426 input_bfd, tmp_name, name);
1427
1428 free (tmp_name);
1429
1430 return hash;
1431 }
1432
1433 /* Locate the ARM encoded calling stub for NAME. */
1434
1435 static struct elf_link_hash_entry *
1436 find_arm_glue (struct bfd_link_info *link_info,
1437 const char *name,
1438 bfd *input_bfd)
1439 {
1440 char *tmp_name;
1441 struct elf_link_hash_entry *myh;
1442 struct elf32_arm_link_hash_table *hash_table;
1443
1444 /* We need a pointer to the elfarm specific hash table. */
1445 hash_table = elf32_arm_hash_table (link_info);
1446
1447 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1448 + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1);
1449
1450 BFD_ASSERT (tmp_name);
1451
1452 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1453
1454 myh = elf_link_hash_lookup
1455 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1456
1457 if (myh == NULL)
1458 /* xgettext:c-format */
1459 (*_bfd_error_handler) (_("%B: unable to find ARM glue '%s' for `%s'"),
1460 input_bfd, tmp_name, name);
1461
1462 free (tmp_name);
1463
1464 return myh;
1465 }
1466
1467 /* ARM->Thumb glue:
1468
1469 .arm
1470 __func_from_arm:
1471 ldr r12, __func_addr
1472 bx r12
1473 __func_addr:
1474 .word func @ behave as if you saw a ARM_32 reloc. */
1475
1476 #define ARM2THUMB_GLUE_SIZE 12
1477 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1478 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1479 static const insn32 a2t3_func_addr_insn = 0x00000001;
1480
1481 /* Thumb->ARM: Thumb->(non-interworking aware) ARM
1482
1483 .thumb .thumb
1484 .align 2 .align 2
1485 __func_from_thumb: __func_from_thumb:
1486 bx pc push {r6, lr}
1487 nop ldr r6, __func_addr
1488 .arm mov lr, pc
1489 __func_change_to_arm: bx r6
1490 b func .arm
1491 __func_back_to_thumb:
1492 ldmia r13! {r6, lr}
1493 bx lr
1494 __func_addr:
1495 .word func */
1496
1497 #define THUMB2ARM_GLUE_SIZE 8
1498 static const insn16 t2a1_bx_pc_insn = 0x4778;
1499 static const insn16 t2a2_noop_insn = 0x46c0;
1500 static const insn32 t2a3_b_insn = 0xea000000;
1501
1502 #ifndef ELFARM_NABI_C_INCLUDED
1503 bfd_boolean
1504 bfd_elf32_arm_allocate_interworking_sections (struct bfd_link_info * info)
1505 {
1506 asection * s;
1507 bfd_byte * foo;
1508 struct elf32_arm_link_hash_table * globals;
1509
1510 globals = elf32_arm_hash_table (info);
1511
1512 BFD_ASSERT (globals != NULL);
1513
1514 if (globals->arm_glue_size != 0)
1515 {
1516 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1517
1518 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1519 ARM2THUMB_GLUE_SECTION_NAME);
1520
1521 BFD_ASSERT (s != NULL);
1522
1523 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1524
1525 s->size = globals->arm_glue_size;
1526 s->contents = foo;
1527 }
1528
1529 if (globals->thumb_glue_size != 0)
1530 {
1531 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1532
1533 s = bfd_get_section_by_name
1534 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1535
1536 BFD_ASSERT (s != NULL);
1537
1538 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1539
1540 s->size = globals->thumb_glue_size;
1541 s->contents = foo;
1542 }
1543
1544 return TRUE;
1545 }
1546
1547 static void
1548 record_arm_to_thumb_glue (struct bfd_link_info * link_info,
1549 struct elf_link_hash_entry * h)
1550 {
1551 const char * name = h->root.root.string;
1552 asection * s;
1553 char * tmp_name;
1554 struct elf_link_hash_entry * myh;
1555 struct bfd_link_hash_entry * bh;
1556 struct elf32_arm_link_hash_table * globals;
1557 bfd_vma val;
1558
1559 globals = elf32_arm_hash_table (link_info);
1560
1561 BFD_ASSERT (globals != NULL);
1562 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1563
1564 s = bfd_get_section_by_name
1565 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1566
1567 BFD_ASSERT (s != NULL);
1568
1569 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1);
1570
1571 BFD_ASSERT (tmp_name);
1572
1573 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1574
1575 myh = elf_link_hash_lookup
1576 (&(globals)->root, tmp_name, FALSE, FALSE, TRUE);
1577
1578 if (myh != NULL)
1579 {
1580 /* We've already seen this guy. */
1581 free (tmp_name);
1582 return;
1583 }
1584
1585 /* The only trick here is using hash_table->arm_glue_size as the value.
1586 Even though the section isn't allocated yet, this is where we will be
1587 putting it. */
1588 bh = NULL;
1589 val = globals->arm_glue_size + 1;
1590 _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner,
1591 tmp_name, BSF_GLOBAL, s, val,
1592 NULL, TRUE, FALSE, &bh);
1593
1594 myh = (struct elf_link_hash_entry *) bh;
1595 myh->type = ELF_ST_INFO (STB_LOCAL, STT_FUNC);
1596 myh->forced_local = 1;
1597
1598 free (tmp_name);
1599
1600 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1601
1602 return;
1603 }
1604
1605 static void
1606 record_thumb_to_arm_glue (struct bfd_link_info *link_info,
1607 struct elf_link_hash_entry *h)
1608 {
1609 const char *name = h->root.root.string;
1610 asection *s;
1611 char *tmp_name;
1612 struct elf_link_hash_entry *myh;
1613 struct bfd_link_hash_entry *bh;
1614 struct elf32_arm_link_hash_table *hash_table;
1615 bfd_vma val;
1616
1617 hash_table = elf32_arm_hash_table (link_info);
1618
1619 BFD_ASSERT (hash_table != NULL);
1620 BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL);
1621
1622 s = bfd_get_section_by_name
1623 (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1624
1625 BFD_ASSERT (s != NULL);
1626
1627 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1628 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1629
1630 BFD_ASSERT (tmp_name);
1631
1632 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1633
1634 myh = elf_link_hash_lookup
1635 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE);
1636
1637 if (myh != NULL)
1638 {
1639 /* We've already seen this guy. */
1640 free (tmp_name);
1641 return;
1642 }
1643
1644 bh = NULL;
1645 val = hash_table->thumb_glue_size + 1;
1646 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner,
1647 tmp_name, BSF_GLOBAL, s, val,
1648 NULL, TRUE, FALSE, &bh);
1649
1650 /* If we mark it 'Thumb', the disassembler will do a better job. */
1651 myh = (struct elf_link_hash_entry *) bh;
1652 myh->type = ELF_ST_INFO (STB_LOCAL, STT_ARM_TFUNC);
1653 myh->forced_local = 1;
1654
1655 free (tmp_name);
1656
1657 #define CHANGE_TO_ARM "__%s_change_to_arm"
1658 #define BACK_FROM_ARM "__%s_back_from_arm"
1659
1660 /* Allocate another symbol to mark where we switch to Arm mode. */
1661 tmp_name = bfd_malloc ((bfd_size_type) strlen (name)
1662 + strlen (CHANGE_TO_ARM) + 1);
1663
1664 BFD_ASSERT (tmp_name);
1665
1666 sprintf (tmp_name, CHANGE_TO_ARM, name);
1667
1668 bh = NULL;
1669 val = hash_table->thumb_glue_size + 4,
1670 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner,
1671 tmp_name, BSF_LOCAL, s, val,
1672 NULL, TRUE, FALSE, &bh);
1673
1674 free (tmp_name);
1675
1676 hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1677
1678 return;
1679 }
1680
1681 /* Add the glue sections to ABFD. This function is called from the
1682 linker scripts in ld/emultempl/{armelf}.em. */
1683
1684 bfd_boolean
1685 bfd_elf32_arm_add_glue_sections_to_bfd (bfd *abfd,
1686 struct bfd_link_info *info)
1687 {
1688 flagword flags;
1689 asection *sec;
1690
1691 /* If we are only performing a partial
1692 link do not bother adding the glue. */
1693 if (info->relocatable)
1694 return TRUE;
1695
1696 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1697
1698 if (sec == NULL)
1699 {
1700 /* Note: we do not include the flag SEC_LINKER_CREATED, as this
1701 will prevent elf_link_input_bfd() from processing the contents
1702 of this section. */
1703 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1704
1705 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1706
1707 if (sec == NULL
1708 || !bfd_set_section_flags (abfd, sec, flags)
1709 || !bfd_set_section_alignment (abfd, sec, 2))
1710 return FALSE;
1711
1712 /* Set the gc mark to prevent the section from being removed by garbage
1713 collection, despite the fact that no relocs refer to this section. */
1714 sec->gc_mark = 1;
1715 }
1716
1717 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1718
1719 if (sec == NULL)
1720 {
1721 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1722 | SEC_CODE | SEC_READONLY;
1723
1724 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1725
1726 if (sec == NULL
1727 || !bfd_set_section_flags (abfd, sec, flags)
1728 || !bfd_set_section_alignment (abfd, sec, 2))
1729 return FALSE;
1730
1731 sec->gc_mark = 1;
1732 }
1733
1734 return TRUE;
1735 }
1736
1737 /* Select a BFD to be used to hold the sections used by the glue code.
1738 This function is called from the linker scripts in ld/emultempl/
1739 {armelf/pe}.em */
1740
1741 bfd_boolean
1742 bfd_elf32_arm_get_bfd_for_interworking (bfd *abfd, struct bfd_link_info *info)
1743 {
1744 struct elf32_arm_link_hash_table *globals;
1745
1746 /* If we are only performing a partial link
1747 do not bother getting a bfd to hold the glue. */
1748 if (info->relocatable)
1749 return TRUE;
1750
1751 /* Make sure we don't attach the glue sections to a dynamic object. */
1752 BFD_ASSERT (!(abfd->flags & DYNAMIC));
1753
1754 globals = elf32_arm_hash_table (info);
1755
1756 BFD_ASSERT (globals != NULL);
1757
1758 if (globals->bfd_of_glue_owner != NULL)
1759 return TRUE;
1760
1761 /* Save the bfd for later use. */
1762 globals->bfd_of_glue_owner = abfd;
1763
1764 return TRUE;
1765 }
1766
1767 bfd_boolean
1768 bfd_elf32_arm_process_before_allocation (bfd *abfd,
1769 struct bfd_link_info *link_info,
1770 int byteswap_code)
1771 {
1772 Elf_Internal_Shdr *symtab_hdr;
1773 Elf_Internal_Rela *internal_relocs = NULL;
1774 Elf_Internal_Rela *irel, *irelend;
1775 bfd_byte *contents = NULL;
1776
1777 asection *sec;
1778 struct elf32_arm_link_hash_table *globals;
1779
1780 /* If we are only performing a partial link do not bother
1781 to construct any glue. */
1782 if (link_info->relocatable)
1783 return TRUE;
1784
1785 /* Here we have a bfd that is to be included on the link. We have a hook
1786 to do reloc rummaging, before section sizes are nailed down. */
1787 globals = elf32_arm_hash_table (link_info);
1788
1789 BFD_ASSERT (globals != NULL);
1790 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1791
1792 if (byteswap_code && !bfd_big_endian (abfd))
1793 {
1794 _bfd_error_handler (_("%B: BE8 images only valid in big-endian mode."),
1795 abfd);
1796 return FALSE;
1797 }
1798 globals->byteswap_code = byteswap_code;
1799
1800 /* Rummage around all the relocs and map the glue vectors. */
1801 sec = abfd->sections;
1802
1803 if (sec == NULL)
1804 return TRUE;
1805
1806 for (; sec != NULL; sec = sec->next)
1807 {
1808 if (sec->reloc_count == 0)
1809 continue;
1810
1811 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1812
1813 /* Load the relocs. */
1814 internal_relocs
1815 = _bfd_elf_link_read_relocs (abfd, sec, (void *) NULL,
1816 (Elf_Internal_Rela *) NULL, FALSE);
1817
1818 if (internal_relocs == NULL)
1819 goto error_return;
1820
1821 irelend = internal_relocs + sec->reloc_count;
1822 for (irel = internal_relocs; irel < irelend; irel++)
1823 {
1824 long r_type;
1825 unsigned long r_index;
1826
1827 struct elf_link_hash_entry *h;
1828
1829 r_type = ELF32_R_TYPE (irel->r_info);
1830 r_index = ELF32_R_SYM (irel->r_info);
1831
1832 /* These are the only relocation types we care about. */
1833 if ( r_type != R_ARM_PC24
1834 && r_type != R_ARM_PLT32
1835 #ifndef OLD_ARM_ABI
1836 && r_type != R_ARM_CALL
1837 && r_type != R_ARM_JUMP24
1838 #endif
1839 && r_type != R_ARM_THM_PC22)
1840 continue;
1841
1842 /* Get the section contents if we haven't done so already. */
1843 if (contents == NULL)
1844 {
1845 /* Get cached copy if it exists. */
1846 if (elf_section_data (sec)->this_hdr.contents != NULL)
1847 contents = elf_section_data (sec)->this_hdr.contents;
1848 else
1849 {
1850 /* Go get them off disk. */
1851 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
1852 goto error_return;
1853 }
1854 }
1855
1856 /* If the relocation is not against a symbol it cannot concern us. */
1857 h = NULL;
1858
1859 /* We don't care about local symbols. */
1860 if (r_index < symtab_hdr->sh_info)
1861 continue;
1862
1863 /* This is an external symbol. */
1864 r_index -= symtab_hdr->sh_info;
1865 h = (struct elf_link_hash_entry *)
1866 elf_sym_hashes (abfd)[r_index];
1867
1868 /* If the relocation is against a static symbol it must be within
1869 the current section and so cannot be a cross ARM/Thumb relocation. */
1870 if (h == NULL)
1871 continue;
1872
1873 /* If the call will go through a PLT entry then we do not need
1874 glue. */
1875 if (globals->splt != NULL && h->plt.offset != (bfd_vma) -1)
1876 continue;
1877
1878 switch (r_type)
1879 {
1880 case R_ARM_PC24:
1881 #ifndef OLD_ARM_ABI
1882 case R_ARM_CALL:
1883 case R_ARM_JUMP24:
1884 #endif
1885 /* This one is a call from arm code. We need to look up
1886 the target of the call. If it is a thumb target, we
1887 insert glue. */
1888 if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC)
1889 record_arm_to_thumb_glue (link_info, h);
1890 break;
1891
1892 case R_ARM_THM_PC22:
1893 /* This one is a call from thumb code. We look
1894 up the target of the call. If it is not a thumb
1895 target, we insert glue. */
1896 if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC)
1897 record_thumb_to_arm_glue (link_info, h);
1898 break;
1899
1900 default:
1901 break;
1902 }
1903 }
1904
1905 if (contents != NULL
1906 && elf_section_data (sec)->this_hdr.contents != contents)
1907 free (contents);
1908 contents = NULL;
1909
1910 if (internal_relocs != NULL
1911 && elf_section_data (sec)->relocs != internal_relocs)
1912 free (internal_relocs);
1913 internal_relocs = NULL;
1914 }
1915
1916 return TRUE;
1917
1918 error_return:
1919 if (contents != NULL
1920 && elf_section_data (sec)->this_hdr.contents != contents)
1921 free (contents);
1922 if (internal_relocs != NULL
1923 && elf_section_data (sec)->relocs != internal_relocs)
1924 free (internal_relocs);
1925
1926 return FALSE;
1927 }
1928 #endif
1929
1930
1931 #ifndef OLD_ARM_ABI
1932 /* Set target relocation values needed during linking. */
1933
1934 void
1935 bfd_elf32_arm_set_target_relocs (struct bfd_link_info *link_info,
1936 int target1_is_rel,
1937 char * target2_type,
1938 int fix_v4bx)
1939 {
1940 struct elf32_arm_link_hash_table *globals;
1941
1942 globals = elf32_arm_hash_table (link_info);
1943
1944 globals->target1_is_rel = target1_is_rel;
1945 if (strcmp (target2_type, "rel") == 0)
1946 globals->target2_reloc = R_ARM_REL32;
1947 else if (strcmp (target2_type, "abs") == 0)
1948 globals->target2_reloc = R_ARM_ABS32;
1949 else if (strcmp (target2_type, "got-rel") == 0)
1950 globals->target2_reloc = R_ARM_GOT_PREL;
1951 else
1952 {
1953 _bfd_error_handler (_("Invalid TARGET2 relocation type '%s'."),
1954 target2_type);
1955 }
1956 globals->fix_v4bx = fix_v4bx;
1957 }
1958 #endif
1959
1960 /* The thumb form of a long branch is a bit finicky, because the offset
1961 encoding is split over two fields, each in it's own instruction. They
1962 can occur in any order. So given a thumb form of long branch, and an
1963 offset, insert the offset into the thumb branch and return finished
1964 instruction.
1965
1966 It takes two thumb instructions to encode the target address. Each has
1967 11 bits to invest. The upper 11 bits are stored in one (identified by
1968 H-0.. see below), the lower 11 bits are stored in the other (identified
1969 by H-1).
1970
1971 Combine together and shifted left by 1 (it's a half word address) and
1972 there you have it.
1973
1974 Op: 1111 = F,
1975 H-0, upper address-0 = 000
1976 Op: 1111 = F,
1977 H-1, lower address-0 = 800
1978
1979 They can be ordered either way, but the arm tools I've seen always put
1980 the lower one first. It probably doesn't matter. krk@cygnus.com
1981
1982 XXX: Actually the order does matter. The second instruction (H-1)
1983 moves the computed address into the PC, so it must be the second one
1984 in the sequence. The problem, however is that whilst little endian code
1985 stores the instructions in HI then LOW order, big endian code does the
1986 reverse. nickc@cygnus.com. */
1987
1988 #define LOW_HI_ORDER 0xF800F000
1989 #define HI_LOW_ORDER 0xF000F800
1990
1991 static insn32
1992 insert_thumb_branch (insn32 br_insn, int rel_off)
1993 {
1994 unsigned int low_bits;
1995 unsigned int high_bits;
1996
1997 BFD_ASSERT ((rel_off & 1) != 1);
1998
1999 rel_off >>= 1; /* Half word aligned address. */
2000 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
2001 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
2002
2003 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
2004 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
2005 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
2006 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
2007 else
2008 /* FIXME: abort is probably not the right call. krk@cygnus.com */
2009 abort (); /* Error - not a valid branch instruction form. */
2010
2011 return br_insn;
2012 }
2013
2014 /* Thumb code calling an ARM function. */
2015
2016 static int
2017 elf32_thumb_to_arm_stub (struct bfd_link_info * info,
2018 const char * name,
2019 bfd * input_bfd,
2020 bfd * output_bfd,
2021 asection * input_section,
2022 bfd_byte * hit_data,
2023 asection * sym_sec,
2024 bfd_vma offset,
2025 bfd_signed_vma addend,
2026 bfd_vma val)
2027 {
2028 asection * s = 0;
2029 bfd_vma my_offset;
2030 unsigned long int tmp;
2031 long int ret_offset;
2032 struct elf_link_hash_entry * myh;
2033 struct elf32_arm_link_hash_table * globals;
2034
2035 myh = find_thumb_glue (info, name, input_bfd);
2036 if (myh == NULL)
2037 return FALSE;
2038
2039 globals = elf32_arm_hash_table (info);
2040
2041 BFD_ASSERT (globals != NULL);
2042 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2043
2044 my_offset = myh->root.u.def.value;
2045
2046 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
2047 THUMB2ARM_GLUE_SECTION_NAME);
2048
2049 BFD_ASSERT (s != NULL);
2050 BFD_ASSERT (s->contents != NULL);
2051 BFD_ASSERT (s->output_section != NULL);
2052
2053 if ((my_offset & 0x01) == 0x01)
2054 {
2055 if (sym_sec != NULL
2056 && sym_sec->owner != NULL
2057 && !INTERWORK_FLAG (sym_sec->owner))
2058 {
2059 (*_bfd_error_handler)
2060 (_("%B(%s): warning: interworking not enabled.\n"
2061 " first occurrence: %B: thumb call to arm"),
2062 sym_sec->owner, input_bfd, name);
2063
2064 return FALSE;
2065 }
2066
2067 --my_offset;
2068 myh->root.u.def.value = my_offset;
2069
2070 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
2071 s->contents + my_offset);
2072
2073 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
2074 s->contents + my_offset + 2);
2075
2076 ret_offset =
2077 /* Address of destination of the stub. */
2078 ((bfd_signed_vma) val)
2079 - ((bfd_signed_vma)
2080 /* Offset from the start of the current section
2081 to the start of the stubs. */
2082 (s->output_offset
2083 /* Offset of the start of this stub from the start of the stubs. */
2084 + my_offset
2085 /* Address of the start of the current section. */
2086 + s->output_section->vma)
2087 /* The branch instruction is 4 bytes into the stub. */
2088 + 4
2089 /* ARM branches work from the pc of the instruction + 8. */
2090 + 8);
2091
2092 bfd_put_32 (output_bfd,
2093 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
2094 s->contents + my_offset + 4);
2095 }
2096
2097 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
2098
2099 /* Now go back and fix up the original BL insn to point to here. */
2100 ret_offset =
2101 /* Address of where the stub is located. */
2102 (s->output_section->vma + s->output_offset + my_offset)
2103 /* Address of where the BL is located. */
2104 - (input_section->output_section->vma + input_section->output_offset
2105 + offset)
2106 /* Addend in the relocation. */
2107 - addend
2108 /* Biassing for PC-relative addressing. */
2109 - 8;
2110
2111 tmp = bfd_get_32 (input_bfd, hit_data
2112 - input_section->vma);
2113
2114 bfd_put_32 (output_bfd,
2115 (bfd_vma) insert_thumb_branch (tmp, ret_offset),
2116 hit_data - input_section->vma);
2117
2118 return TRUE;
2119 }
2120
2121 /* Arm code calling a Thumb function. */
2122
2123 static int
2124 elf32_arm_to_thumb_stub (struct bfd_link_info * info,
2125 const char * name,
2126 bfd * input_bfd,
2127 bfd * output_bfd,
2128 asection * input_section,
2129 bfd_byte * hit_data,
2130 asection * sym_sec,
2131 bfd_vma offset,
2132 bfd_signed_vma addend,
2133 bfd_vma val)
2134 {
2135 unsigned long int tmp;
2136 bfd_vma my_offset;
2137 asection * s;
2138 long int ret_offset;
2139 struct elf_link_hash_entry * myh;
2140 struct elf32_arm_link_hash_table * globals;
2141
2142 myh = find_arm_glue (info, name, input_bfd);
2143 if (myh == NULL)
2144 return FALSE;
2145
2146 globals = elf32_arm_hash_table (info);
2147
2148 BFD_ASSERT (globals != NULL);
2149 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2150
2151 my_offset = myh->root.u.def.value;
2152 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
2153 ARM2THUMB_GLUE_SECTION_NAME);
2154 BFD_ASSERT (s != NULL);
2155 BFD_ASSERT (s->contents != NULL);
2156 BFD_ASSERT (s->output_section != NULL);
2157
2158 if ((my_offset & 0x01) == 0x01)
2159 {
2160 if (sym_sec != NULL
2161 && sym_sec->owner != NULL
2162 && !INTERWORK_FLAG (sym_sec->owner))
2163 {
2164 (*_bfd_error_handler)
2165 (_("%B(%s): warning: interworking not enabled.\n"
2166 " first occurrence: %B: arm call to thumb"),
2167 sym_sec->owner, input_bfd, name);
2168 }
2169
2170 --my_offset;
2171 myh->root.u.def.value = my_offset;
2172
2173 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
2174 s->contents + my_offset);
2175
2176 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
2177 s->contents + my_offset + 4);
2178
2179 /* It's a thumb address. Add the low order bit. */
2180 bfd_put_32 (output_bfd, val | a2t3_func_addr_insn,
2181 s->contents + my_offset + 8);
2182 }
2183
2184 BFD_ASSERT (my_offset <= globals->arm_glue_size);
2185
2186 tmp = bfd_get_32 (input_bfd, hit_data);
2187 tmp = tmp & 0xFF000000;
2188
2189 /* Somehow these are both 4 too far, so subtract 8. */
2190 ret_offset = (s->output_offset
2191 + my_offset
2192 + s->output_section->vma
2193 - (input_section->output_offset
2194 + input_section->output_section->vma
2195 + offset + addend)
2196 - 8);
2197
2198 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
2199
2200 bfd_put_32 (output_bfd, (bfd_vma) tmp, hit_data - input_section->vma);
2201
2202 return TRUE;
2203 }
2204
2205
2206 #ifndef OLD_ARM_ABI
2207 /* Some relocations map to different relocations depending on the
2208 target. Return the real relocation. */
2209 static int
2210 arm_real_reloc_type (struct elf32_arm_link_hash_table * globals,
2211 int r_type)
2212 {
2213 switch (r_type)
2214 {
2215 case R_ARM_TARGET1:
2216 if (globals->target1_is_rel)
2217 return R_ARM_REL32;
2218 else
2219 return R_ARM_ABS32;
2220
2221 case R_ARM_TARGET2:
2222 return globals->target2_reloc;
2223
2224 default:
2225 return r_type;
2226 }
2227 }
2228 #endif /* OLD_ARM_ABI */
2229
2230
2231 /* Perform a relocation as part of a final link. */
2232
2233 static bfd_reloc_status_type
2234 elf32_arm_final_link_relocate (reloc_howto_type * howto,
2235 bfd * input_bfd,
2236 bfd * output_bfd,
2237 asection * input_section,
2238 bfd_byte * contents,
2239 Elf_Internal_Rela * rel,
2240 bfd_vma value,
2241 struct bfd_link_info * info,
2242 asection * sym_sec,
2243 const char * sym_name,
2244 int sym_flags,
2245 struct elf_link_hash_entry * h)
2246 {
2247 unsigned long r_type = howto->type;
2248 unsigned long r_symndx;
2249 bfd_byte * hit_data = contents + rel->r_offset;
2250 bfd * dynobj = NULL;
2251 Elf_Internal_Shdr * symtab_hdr;
2252 struct elf_link_hash_entry ** sym_hashes;
2253 bfd_vma * local_got_offsets;
2254 asection * sgot = NULL;
2255 asection * splt = NULL;
2256 asection * sreloc = NULL;
2257 bfd_vma addend;
2258 bfd_signed_vma signed_addend;
2259 struct elf32_arm_link_hash_table * globals;
2260
2261 globals = elf32_arm_hash_table (info);
2262
2263 #ifndef OLD_ARM_ABI
2264 /* Some relocation type map to different relocations depending on the
2265 target. We pick the right one here. */
2266 r_type = arm_real_reloc_type (globals, r_type);
2267 if (r_type != howto->type)
2268 howto = elf32_arm_howto_from_type (r_type);
2269 #endif /* OLD_ARM_ABI */
2270
2271 /* If the start address has been set, then set the EF_ARM_HASENTRY
2272 flag. Setting this more than once is redundant, but the cost is
2273 not too high, and it keeps the code simple.
2274
2275 The test is done here, rather than somewhere else, because the
2276 start address is only set just before the final link commences.
2277
2278 Note - if the user deliberately sets a start address of 0, the
2279 flag will not be set. */
2280 if (bfd_get_start_address (output_bfd) != 0)
2281 elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY;
2282
2283 dynobj = elf_hash_table (info)->dynobj;
2284 if (dynobj)
2285 {
2286 sgot = bfd_get_section_by_name (dynobj, ".got");
2287 splt = bfd_get_section_by_name (dynobj, ".plt");
2288 }
2289 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
2290 sym_hashes = elf_sym_hashes (input_bfd);
2291 local_got_offsets = elf_local_got_offsets (input_bfd);
2292 r_symndx = ELF32_R_SYM (rel->r_info);
2293
2294 if (globals->use_rel)
2295 {
2296 addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask;
2297
2298 if (addend & ((howto->src_mask + 1) >> 1))
2299 {
2300 signed_addend = -1;
2301 signed_addend &= ~ howto->src_mask;
2302 signed_addend |= addend;
2303 }
2304 else
2305 signed_addend = addend;
2306 }
2307 else
2308 addend = signed_addend = rel->r_addend;
2309
2310 switch (r_type)
2311 {
2312 case R_ARM_NONE:
2313 return bfd_reloc_ok;
2314
2315 case R_ARM_PC24:
2316 case R_ARM_ABS32:
2317 case R_ARM_REL32:
2318 #ifndef OLD_ARM_ABI
2319 case R_ARM_CALL:
2320 case R_ARM_JUMP24:
2321 case R_ARM_XPC25:
2322 case R_ARM_PREL31:
2323 #endif
2324 case R_ARM_PLT32:
2325 /* r_symndx will be zero only for relocs against symbols
2326 from removed linkonce sections, or sections discarded by
2327 a linker script. */
2328 if (r_symndx == 0)
2329 return bfd_reloc_ok;
2330
2331 /* Handle relocations which should use the PLT entry. ABS32/REL32
2332 will use the symbol's value, which may point to a PLT entry, but we
2333 don't need to handle that here. If we created a PLT entry, all
2334 branches in this object should go to it. */
2335 if ((r_type != R_ARM_ABS32 && r_type != R_ARM_REL32)
2336 && h != NULL
2337 && splt != NULL
2338 && h->plt.offset != (bfd_vma) -1)
2339 {
2340 /* If we've created a .plt section, and assigned a PLT entry to
2341 this function, it should not be known to bind locally. If
2342 it were, we would have cleared the PLT entry. */
2343 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h));
2344
2345 value = (splt->output_section->vma
2346 + splt->output_offset
2347 + h->plt.offset);
2348 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2349 contents, rel->r_offset, value,
2350 (bfd_vma) 0);
2351 }
2352
2353 /* When generating a shared object or relocatable executable, these
2354 relocations are copied into the output file to be resolved at
2355 run time. */
2356 if ((info->shared || globals->root.is_relocatable_executable)
2357 && (input_section->flags & SEC_ALLOC)
2358 && (r_type != R_ARM_REL32
2359 || !SYMBOL_CALLS_LOCAL (info, h))
2360 && (h == NULL
2361 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2362 || h->root.type != bfd_link_hash_undefweak)
2363 && r_type != R_ARM_PC24
2364 #ifndef OLD_ARM_ABI
2365 && r_type != R_ARM_CALL
2366 && r_type != R_ARM_JUMP24
2367 && r_type != R_ARM_PREL31
2368 #endif
2369 && r_type != R_ARM_PLT32)
2370 {
2371 Elf_Internal_Rela outrel;
2372 bfd_byte *loc;
2373 bfd_boolean skip, relocate;
2374
2375 if (sreloc == NULL)
2376 {
2377 const char * name;
2378
2379 name = (bfd_elf_string_from_elf_section
2380 (input_bfd,
2381 elf_elfheader (input_bfd)->e_shstrndx,
2382 elf_section_data (input_section)->rel_hdr.sh_name));
2383 if (name == NULL)
2384 return bfd_reloc_notsupported;
2385
2386 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
2387 && strcmp (bfd_get_section_name (input_bfd,
2388 input_section),
2389 name + 4) == 0);
2390
2391 sreloc = bfd_get_section_by_name (dynobj, name);
2392 BFD_ASSERT (sreloc != NULL);
2393 }
2394
2395 skip = FALSE;
2396 relocate = FALSE;
2397
2398 outrel.r_offset =
2399 _bfd_elf_section_offset (output_bfd, info, input_section,
2400 rel->r_offset);
2401 if (outrel.r_offset == (bfd_vma) -1)
2402 skip = TRUE;
2403 else if (outrel.r_offset == (bfd_vma) -2)
2404 skip = TRUE, relocate = TRUE;
2405 outrel.r_offset += (input_section->output_section->vma
2406 + input_section->output_offset);
2407
2408 if (skip)
2409 memset (&outrel, 0, sizeof outrel);
2410 else if (h != NULL
2411 && h->dynindx != -1
2412 && (!info->shared
2413 || !info->symbolic
2414 || !h->def_regular))
2415 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2416 else
2417 {
2418 int symbol;
2419
2420 /* This symbol is local, or marked to become local. */
2421 relocate = TRUE;
2422 if (sym_flags == STT_ARM_TFUNC)
2423 value |= 1;
2424 if (globals->symbian_p)
2425 {
2426 /* On Symbian OS, the data segment and text segement
2427 can be relocated independently. Therefore, we
2428 must indicate the segment to which this
2429 relocation is relative. The BPABI allows us to
2430 use any symbol in the right segment; we just use
2431 the section symbol as it is convenient. (We
2432 cannot use the symbol given by "h" directly as it
2433 will not appear in the dynamic symbol table.) */
2434 symbol = elf_section_data (sym_sec->output_section)->dynindx;
2435 BFD_ASSERT (symbol != 0);
2436 }
2437 else
2438 /* On SVR4-ish systems, the dynamic loader cannot
2439 relocate the text and data segments independently,
2440 so the symbol does not matter. */
2441 symbol = 0;
2442 outrel.r_info = ELF32_R_INFO (symbol, R_ARM_RELATIVE);
2443 }
2444
2445 loc = sreloc->contents;
2446 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2447 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2448
2449 /* If this reloc is against an external symbol, we do not want to
2450 fiddle with the addend. Otherwise, we need to include the symbol
2451 value so that it becomes an addend for the dynamic reloc. */
2452 if (! relocate)
2453 return bfd_reloc_ok;
2454
2455 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2456 contents, rel->r_offset, value,
2457 (bfd_vma) 0);
2458 }
2459 else switch (r_type)
2460 {
2461 #ifndef OLD_ARM_ABI
2462 case R_ARM_XPC25: /* Arm BLX instruction. */
2463 case R_ARM_CALL:
2464 case R_ARM_JUMP24:
2465 #endif
2466 case R_ARM_PC24: /* Arm B/BL instruction */
2467 case R_ARM_PLT32:
2468 #ifndef OLD_ARM_ABI
2469 if (r_type == R_ARM_XPC25)
2470 {
2471 /* Check for Arm calling Arm function. */
2472 /* FIXME: Should we translate the instruction into a BL
2473 instruction instead ? */
2474 if (sym_flags != STT_ARM_TFUNC)
2475 (*_bfd_error_handler)
2476 (_("\%B: Warning: Arm BLX instruction targets Arm function '%s'."),
2477 input_bfd,
2478 h ? h->root.root.string : "(local)");
2479 }
2480 else
2481 #endif
2482 {
2483 /* Check for Arm calling Thumb function. */
2484 if (sym_flags == STT_ARM_TFUNC)
2485 {
2486 elf32_arm_to_thumb_stub (info, sym_name, input_bfd,
2487 output_bfd, input_section,
2488 hit_data, sym_sec, rel->r_offset,
2489 signed_addend, value);
2490 return bfd_reloc_ok;
2491 }
2492 }
2493
2494 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
2495 where:
2496 S is the address of the symbol in the relocation.
2497 P is address of the instruction being relocated.
2498 A is the addend (extracted from the instruction) in bytes.
2499
2500 S is held in 'value'.
2501 P is the base address of the section containing the
2502 instruction plus the offset of the reloc into that
2503 section, ie:
2504 (input_section->output_section->vma +
2505 input_section->output_offset +
2506 rel->r_offset).
2507 A is the addend, converted into bytes, ie:
2508 (signed_addend * 4)
2509
2510 Note: None of these operations have knowledge of the pipeline
2511 size of the processor, thus it is up to the assembler to
2512 encode this information into the addend. */
2513 value -= (input_section->output_section->vma
2514 + input_section->output_offset);
2515 value -= rel->r_offset;
2516 if (globals->use_rel)
2517 value += (signed_addend << howto->size);
2518 else
2519 /* RELA addends do not have to be adjusted by howto->size. */
2520 value += signed_addend;
2521
2522 signed_addend = value;
2523 signed_addend >>= howto->rightshift;
2524
2525 /* It is not an error for an undefined weak reference to be
2526 out of range. Any program that branches to such a symbol
2527 is going to crash anyway, so there is no point worrying
2528 about getting the destination exactly right. */
2529 if (! h || h->root.type != bfd_link_hash_undefweak)
2530 {
2531 /* Perform a signed range check. */
2532 if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1))
2533 || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1)))
2534 return bfd_reloc_overflow;
2535 }
2536
2537 #ifndef OLD_ARM_ABI
2538 /* If necessary set the H bit in the BLX instruction. */
2539 if (r_type == R_ARM_XPC25 && ((value & 2) == 2))
2540 value = (signed_addend & howto->dst_mask)
2541 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask))
2542 | (1 << 24);
2543 else
2544 #endif
2545 value = (signed_addend & howto->dst_mask)
2546 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask));
2547 break;
2548
2549 case R_ARM_ABS32:
2550 value += addend;
2551 if (sym_flags == STT_ARM_TFUNC)
2552 value |= 1;
2553 break;
2554
2555 case R_ARM_REL32:
2556 value -= (input_section->output_section->vma
2557 + input_section->output_offset + rel->r_offset);
2558 value += addend;
2559 break;
2560
2561 #ifndef OLD_ARM_ABI
2562 case R_ARM_PREL31:
2563 value -= (input_section->output_section->vma
2564 + input_section->output_offset + rel->r_offset);
2565 value += signed_addend;
2566 if (! h || h->root.type != bfd_link_hash_undefweak)
2567 {
2568 /* Check for overflow */
2569 if ((value ^ (value >> 1)) & (1 << 30))
2570 return bfd_reloc_overflow;
2571 }
2572 value &= 0x7fffffff;
2573 value |= (bfd_get_32 (input_bfd, hit_data) & 0x80000000);
2574 if (sym_flags == STT_ARM_TFUNC)
2575 value |= 1;
2576 break;
2577 #endif
2578 }
2579
2580 bfd_put_32 (input_bfd, value, hit_data);
2581 return bfd_reloc_ok;
2582
2583 case R_ARM_ABS8:
2584 value += addend;
2585 if ((long) value > 0x7f || (long) value < -0x80)
2586 return bfd_reloc_overflow;
2587
2588 bfd_put_8 (input_bfd, value, hit_data);
2589 return bfd_reloc_ok;
2590
2591 case R_ARM_ABS16:
2592 value += addend;
2593
2594 if ((long) value > 0x7fff || (long) value < -0x8000)
2595 return bfd_reloc_overflow;
2596
2597 bfd_put_16 (input_bfd, value, hit_data);
2598 return bfd_reloc_ok;
2599
2600 case R_ARM_ABS12:
2601 /* Support ldr and str instruction for the arm */
2602 /* Also thumb b (unconditional branch). ??? Really? */
2603 value += addend;
2604
2605 if ((long) value > 0x7ff || (long) value < -0x800)
2606 return bfd_reloc_overflow;
2607
2608 value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000);
2609 bfd_put_32 (input_bfd, value, hit_data);
2610 return bfd_reloc_ok;
2611
2612 case R_ARM_THM_ABS5:
2613 /* Support ldr and str instructions for the thumb. */
2614 if (globals->use_rel)
2615 {
2616 /* Need to refetch addend. */
2617 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2618 /* ??? Need to determine shift amount from operand size. */
2619 addend >>= howto->rightshift;
2620 }
2621 value += addend;
2622
2623 /* ??? Isn't value unsigned? */
2624 if ((long) value > 0x1f || (long) value < -0x10)
2625 return bfd_reloc_overflow;
2626
2627 /* ??? Value needs to be properly shifted into place first. */
2628 value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f;
2629 bfd_put_16 (input_bfd, value, hit_data);
2630 return bfd_reloc_ok;
2631
2632 #ifndef OLD_ARM_ABI
2633 case R_ARM_THM_XPC22:
2634 #endif
2635 case R_ARM_THM_PC22:
2636 /* Thumb BL (branch long instruction). */
2637 {
2638 bfd_vma relocation;
2639 bfd_boolean overflow = FALSE;
2640 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data);
2641 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2);
2642 bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift;
2643 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2644 bfd_vma check;
2645 bfd_signed_vma signed_check;
2646
2647 /* Need to refetch the addend and squish the two 11 bit pieces
2648 together. */
2649 if (globals->use_rel)
2650 {
2651 bfd_vma upper = upper_insn & 0x7ff;
2652 bfd_vma lower = lower_insn & 0x7ff;
2653 upper = (upper ^ 0x400) - 0x400; /* Sign extend. */
2654 addend = (upper << 12) | (lower << 1);
2655 signed_addend = addend;
2656 }
2657 #ifndef OLD_ARM_ABI
2658 if (r_type == R_ARM_THM_XPC22)
2659 {
2660 /* Check for Thumb to Thumb call. */
2661 /* FIXME: Should we translate the instruction into a BL
2662 instruction instead ? */
2663 if (sym_flags == STT_ARM_TFUNC)
2664 (*_bfd_error_handler)
2665 (_("%B: Warning: Thumb BLX instruction targets thumb function '%s'."),
2666 input_bfd,
2667 h ? h->root.root.string : "(local)");
2668 }
2669 else
2670 #endif
2671 {
2672 /* If it is not a call to Thumb, assume call to Arm.
2673 If it is a call relative to a section name, then it is not a
2674 function call at all, but rather a long jump. Calls through
2675 the PLT do not require stubs. */
2676 if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION
2677 && (h == NULL || splt == NULL
2678 || h->plt.offset == (bfd_vma) -1))
2679 {
2680 if (elf32_thumb_to_arm_stub
2681 (info, sym_name, input_bfd, output_bfd, input_section,
2682 hit_data, sym_sec, rel->r_offset, signed_addend, value))
2683 return bfd_reloc_ok;
2684 else
2685 return bfd_reloc_dangerous;
2686 }
2687 }
2688
2689 /* Handle calls via the PLT. */
2690 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1)
2691 {
2692 value = (splt->output_section->vma
2693 + splt->output_offset
2694 + h->plt.offset);
2695 /* Target the Thumb stub before the ARM PLT entry. */
2696 value -= 4;
2697 }
2698
2699 relocation = value + signed_addend;
2700
2701 relocation -= (input_section->output_section->vma
2702 + input_section->output_offset
2703 + rel->r_offset);
2704
2705 check = relocation >> howto->rightshift;
2706
2707 /* If this is a signed value, the rightshift just dropped
2708 leading 1 bits (assuming twos complement). */
2709 if ((bfd_signed_vma) relocation >= 0)
2710 signed_check = check;
2711 else
2712 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift);
2713
2714 /* Assumes two's complement. */
2715 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2716 overflow = TRUE;
2717
2718 #ifndef OLD_ARM_ABI
2719 if (r_type == R_ARM_THM_XPC22
2720 && ((lower_insn & 0x1800) == 0x0800))
2721 /* For a BLX instruction, make sure that the relocation is rounded up
2722 to a word boundary. This follows the semantics of the instruction
2723 which specifies that bit 1 of the target address will come from bit
2724 1 of the base address. */
2725 relocation = (relocation + 2) & ~ 3;
2726 #endif
2727 /* Put RELOCATION back into the insn. */
2728 upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff);
2729 lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff);
2730
2731 /* Put the relocated value back in the object file: */
2732 bfd_put_16 (input_bfd, upper_insn, hit_data);
2733 bfd_put_16 (input_bfd, lower_insn, hit_data + 2);
2734
2735 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok);
2736 }
2737 break;
2738
2739 case R_ARM_THM_PC11:
2740 case R_ARM_THM_PC9:
2741 /* Thumb B (branch) instruction). */
2742 {
2743 bfd_signed_vma relocation;
2744 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
2745 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2746 bfd_signed_vma signed_check;
2747
2748 if (globals->use_rel)
2749 {
2750 /* Need to refetch addend. */
2751 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2752 if (addend & ((howto->src_mask + 1) >> 1))
2753 {
2754 signed_addend = -1;
2755 signed_addend &= ~ howto->src_mask;
2756 signed_addend |= addend;
2757 }
2758 else
2759 signed_addend = addend;
2760 /* The value in the insn has been right shifted. We need to
2761 undo this, so that we can perform the address calculation
2762 in terms of bytes. */
2763 signed_addend <<= howto->rightshift;
2764 }
2765 relocation = value + signed_addend;
2766
2767 relocation -= (input_section->output_section->vma
2768 + input_section->output_offset
2769 + rel->r_offset);
2770
2771 relocation >>= howto->rightshift;
2772 signed_check = relocation;
2773 relocation &= howto->dst_mask;
2774 relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask));
2775
2776 bfd_put_16 (input_bfd, relocation, hit_data);
2777
2778 /* Assumes two's complement. */
2779 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2780 return bfd_reloc_overflow;
2781
2782 return bfd_reloc_ok;
2783 }
2784
2785 #ifndef OLD_ARM_ABI
2786 case R_ARM_ALU_PCREL7_0:
2787 case R_ARM_ALU_PCREL15_8:
2788 case R_ARM_ALU_PCREL23_15:
2789 {
2790 bfd_vma insn;
2791 bfd_vma relocation;
2792
2793 insn = bfd_get_32 (input_bfd, hit_data);
2794 if (globals->use_rel)
2795 {
2796 /* Extract the addend. */
2797 addend = (insn & 0xff) << ((insn & 0xf00) >> 7);
2798 signed_addend = addend;
2799 }
2800 relocation = value + signed_addend;
2801
2802 relocation -= (input_section->output_section->vma
2803 + input_section->output_offset
2804 + rel->r_offset);
2805 insn = (insn & ~0xfff)
2806 | ((howto->bitpos << 7) & 0xf00)
2807 | ((relocation >> howto->bitpos) & 0xff);
2808 bfd_put_32 (input_bfd, value, hit_data);
2809 }
2810 return bfd_reloc_ok;
2811 #endif
2812
2813 case R_ARM_GNU_VTINHERIT:
2814 case R_ARM_GNU_VTENTRY:
2815 return bfd_reloc_ok;
2816
2817 case R_ARM_COPY:
2818 return bfd_reloc_notsupported;
2819
2820 case R_ARM_GLOB_DAT:
2821 return bfd_reloc_notsupported;
2822
2823 case R_ARM_JUMP_SLOT:
2824 return bfd_reloc_notsupported;
2825
2826 case R_ARM_RELATIVE:
2827 return bfd_reloc_notsupported;
2828
2829 case R_ARM_GOTOFF:
2830 /* Relocation is relative to the start of the
2831 global offset table. */
2832
2833 BFD_ASSERT (sgot != NULL);
2834 if (sgot == NULL)
2835 return bfd_reloc_notsupported;
2836
2837 /* If we are addressing a Thumb function, we need to adjust the
2838 address by one, so that attempts to call the function pointer will
2839 correctly interpret it as Thumb code. */
2840 if (sym_flags == STT_ARM_TFUNC)
2841 value += 1;
2842
2843 /* Note that sgot->output_offset is not involved in this
2844 calculation. We always want the start of .got. If we
2845 define _GLOBAL_OFFSET_TABLE in a different way, as is
2846 permitted by the ABI, we might have to change this
2847 calculation. */
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_GOTPC:
2854 /* Use global offset table as symbol value. */
2855 BFD_ASSERT (sgot != NULL);
2856
2857 if (sgot == NULL)
2858 return bfd_reloc_notsupported;
2859
2860 value = sgot->output_section->vma;
2861 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2862 contents, rel->r_offset, value,
2863 (bfd_vma) 0);
2864
2865 case R_ARM_GOT32:
2866 #ifndef OLD_ARM_ABI
2867 case R_ARM_GOT_PREL:
2868 #endif
2869 /* Relocation is to the entry for this symbol in the
2870 global offset table. */
2871 if (sgot == NULL)
2872 return bfd_reloc_notsupported;
2873
2874 if (h != NULL)
2875 {
2876 bfd_vma off;
2877 bfd_boolean dyn;
2878
2879 off = h->got.offset;
2880 BFD_ASSERT (off != (bfd_vma) -1);
2881 dyn = globals->root.dynamic_sections_created;
2882
2883 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2884 || (info->shared
2885 && SYMBOL_REFERENCES_LOCAL (info, h))
2886 || (ELF_ST_VISIBILITY (h->other)
2887 && h->root.type == bfd_link_hash_undefweak))
2888 {
2889 /* This is actually a static link, or it is a -Bsymbolic link
2890 and the symbol is defined locally. We must initialize this
2891 entry in the global offset table. Since the offset must
2892 always be a multiple of 4, we use the least significant bit
2893 to record whether we have initialized it already.
2894
2895 When doing a dynamic link, we create a .rel.got relocation
2896 entry to initialize the value. This is done in the
2897 finish_dynamic_symbol routine. */
2898 if ((off & 1) != 0)
2899 off &= ~1;
2900 else
2901 {
2902 /* If we are addressing a Thumb function, we need to
2903 adjust the address by one, so that attempts to
2904 call the function pointer will correctly
2905 interpret it as Thumb code. */
2906 if (sym_flags == STT_ARM_TFUNC)
2907 value |= 1;
2908
2909 bfd_put_32 (output_bfd, value, sgot->contents + off);
2910 h->got.offset |= 1;
2911 }
2912 }
2913
2914 value = sgot->output_offset + off;
2915 }
2916 else
2917 {
2918 bfd_vma off;
2919
2920 BFD_ASSERT (local_got_offsets != NULL &&
2921 local_got_offsets[r_symndx] != (bfd_vma) -1);
2922
2923 off = local_got_offsets[r_symndx];
2924
2925 /* The offset must always be a multiple of 4. We use the
2926 least significant bit to record whether we have already
2927 generated the necessary reloc. */
2928 if ((off & 1) != 0)
2929 off &= ~1;
2930 else
2931 {
2932 /* If we are addressing a Thumb function, we need to
2933 adjust the address by one, so that attempts to
2934 call the function pointer will correctly
2935 interpret it as Thumb code. */
2936 if (sym_flags == STT_ARM_TFUNC)
2937 value |= 1;
2938
2939 bfd_put_32 (output_bfd, value, sgot->contents + off);
2940
2941 if (info->shared)
2942 {
2943 asection * srelgot;
2944 Elf_Internal_Rela outrel;
2945 bfd_byte *loc;
2946
2947 srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
2948 BFD_ASSERT (srelgot != NULL);
2949
2950 outrel.r_offset = (sgot->output_section->vma
2951 + sgot->output_offset
2952 + off);
2953 outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
2954 loc = srelgot->contents;
2955 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2956 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2957 }
2958
2959 local_got_offsets[r_symndx] |= 1;
2960 }
2961
2962 value = sgot->output_offset + off;
2963 }
2964 if (r_type != R_ARM_GOT32)
2965 value += sgot->output_section->vma;
2966
2967 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2968 contents, rel->r_offset, value,
2969 (bfd_vma) 0);
2970
2971 case R_ARM_SBREL32:
2972 return bfd_reloc_notsupported;
2973
2974 case R_ARM_AMP_VCALL9:
2975 return bfd_reloc_notsupported;
2976
2977 case R_ARM_RSBREL32:
2978 return bfd_reloc_notsupported;
2979
2980 case R_ARM_THM_RPC22:
2981 return bfd_reloc_notsupported;
2982
2983 case R_ARM_RREL32:
2984 return bfd_reloc_notsupported;
2985
2986 case R_ARM_RABS32:
2987 return bfd_reloc_notsupported;
2988
2989 case R_ARM_RPC24:
2990 return bfd_reloc_notsupported;
2991
2992 case R_ARM_RBASE:
2993 return bfd_reloc_notsupported;
2994
2995 case R_ARM_V4BX:
2996 if (globals->fix_v4bx)
2997 {
2998 bfd_vma insn = bfd_get_32 (input_bfd, hit_data);
2999
3000 /* Ensure that we have a BX instruction. */
3001 BFD_ASSERT ((insn & 0x0ffffff0) == 0x012fff10);
3002
3003 /* Preserve Rm (lowest four bits) and the condition code
3004 (highest four bits). Other bits encode MOV PC,Rm. */
3005 insn = (insn & 0xf000000f) | 0x01a0f000;
3006
3007 bfd_put_32 (input_bfd, insn, hit_data);
3008 }
3009 return bfd_reloc_ok;
3010
3011 default:
3012 return bfd_reloc_notsupported;
3013 }
3014 }
3015
3016 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
3017 static void
3018 arm_add_to_rel (bfd * abfd,
3019 bfd_byte * address,
3020 reloc_howto_type * howto,
3021 bfd_signed_vma increment)
3022 {
3023 bfd_signed_vma addend;
3024
3025 if (howto->type == R_ARM_THM_PC22)
3026 {
3027 int upper_insn, lower_insn;
3028 int upper, lower;
3029
3030 upper_insn = bfd_get_16 (abfd, address);
3031 lower_insn = bfd_get_16 (abfd, address + 2);
3032 upper = upper_insn & 0x7ff;
3033 lower = lower_insn & 0x7ff;
3034
3035 addend = (upper << 12) | (lower << 1);
3036 addend += increment;
3037 addend >>= 1;
3038
3039 upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff);
3040 lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff);
3041
3042 bfd_put_16 (abfd, (bfd_vma) upper_insn, address);
3043 bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2);
3044 }
3045 else
3046 {
3047 bfd_vma contents;
3048
3049 contents = bfd_get_32 (abfd, address);
3050
3051 /* Get the (signed) value from the instruction. */
3052 addend = contents & howto->src_mask;
3053 if (addend & ((howto->src_mask + 1) >> 1))
3054 {
3055 bfd_signed_vma mask;
3056
3057 mask = -1;
3058 mask &= ~ howto->src_mask;
3059 addend |= mask;
3060 }
3061
3062 /* Add in the increment, (which is a byte value). */
3063 switch (howto->type)
3064 {
3065 default:
3066 addend += increment;
3067 break;
3068
3069 case R_ARM_PC24:
3070 #ifndef OLD_ARM_ABI
3071 case R_ARM_CALL:
3072 case R_ARM_JUMP24:
3073 #endif
3074 addend <<= howto->size;
3075 addend += increment;
3076
3077 /* Should we check for overflow here ? */
3078
3079 /* Drop any undesired bits. */
3080 addend >>= howto->rightshift;
3081 break;
3082 }
3083
3084 contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask);
3085
3086 bfd_put_32 (abfd, contents, address);
3087 }
3088 }
3089
3090 /* Relocate an ARM ELF section. */
3091 static bfd_boolean
3092 elf32_arm_relocate_section (bfd * output_bfd,
3093 struct bfd_link_info * info,
3094 bfd * input_bfd,
3095 asection * input_section,
3096 bfd_byte * contents,
3097 Elf_Internal_Rela * relocs,
3098 Elf_Internal_Sym * local_syms,
3099 asection ** local_sections)
3100 {
3101 Elf_Internal_Shdr *symtab_hdr;
3102 struct elf_link_hash_entry **sym_hashes;
3103 Elf_Internal_Rela *rel;
3104 Elf_Internal_Rela *relend;
3105 const char *name;
3106 struct elf32_arm_link_hash_table * globals;
3107
3108 globals = elf32_arm_hash_table (info);
3109 if (info->relocatable && !globals->use_rel)
3110 return TRUE;
3111
3112 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
3113 sym_hashes = elf_sym_hashes (input_bfd);
3114
3115 rel = relocs;
3116 relend = relocs + input_section->reloc_count;
3117 for (; rel < relend; rel++)
3118 {
3119 int r_type;
3120 reloc_howto_type * howto;
3121 unsigned long r_symndx;
3122 Elf_Internal_Sym * sym;
3123 asection * sec;
3124 struct elf_link_hash_entry * h;
3125 bfd_vma relocation;
3126 bfd_reloc_status_type r;
3127 arelent bfd_reloc;
3128
3129 r_symndx = ELF32_R_SYM (rel->r_info);
3130 r_type = ELF32_R_TYPE (rel->r_info);
3131 r_type = arm_real_reloc_type (globals, r_type);
3132
3133 if ( r_type == R_ARM_GNU_VTENTRY
3134 || r_type == R_ARM_GNU_VTINHERIT)
3135 continue;
3136
3137 bfd_reloc.howto = elf32_arm_howto_from_type (r_type);
3138 howto = bfd_reloc.howto;
3139
3140 if (info->relocatable && globals->use_rel)
3141 {
3142 /* This is a relocatable link. We don't have to change
3143 anything, unless the reloc is against a section symbol,
3144 in which case we have to adjust according to where the
3145 section symbol winds up in the output section. */
3146 if (r_symndx < symtab_hdr->sh_info)
3147 {
3148 sym = local_syms + r_symndx;
3149 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3150 {
3151 sec = local_sections[r_symndx];
3152 arm_add_to_rel (input_bfd, contents + rel->r_offset,
3153 howto,
3154 (bfd_signed_vma) (sec->output_offset
3155 + sym->st_value));
3156 }
3157 }
3158
3159 continue;
3160 }
3161
3162 /* This is a final link. */
3163 h = NULL;
3164 sym = NULL;
3165 sec = NULL;
3166
3167 if (r_symndx < symtab_hdr->sh_info)
3168 {
3169 sym = local_syms + r_symndx;
3170 sec = local_sections[r_symndx];
3171 if (globals->use_rel)
3172 {
3173 relocation = (sec->output_section->vma
3174 + sec->output_offset
3175 + sym->st_value);
3176 if ((sec->flags & SEC_MERGE)
3177 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3178 {
3179 asection *msec;
3180 bfd_vma addend, value;
3181
3182 if (howto->rightshift)
3183 {
3184 (*_bfd_error_handler)
3185 (_("%B(%A+0x%lx): %s relocation against SEC_MERGE section"),
3186 input_bfd, input_section,
3187 (long) rel->r_offset, howto->name);
3188 return FALSE;
3189 }
3190
3191 value = bfd_get_32 (input_bfd, contents + rel->r_offset);
3192
3193 /* Get the (signed) value from the instruction. */
3194 addend = value & howto->src_mask;
3195 if (addend & ((howto->src_mask + 1) >> 1))
3196 {
3197 bfd_signed_vma mask;
3198
3199 mask = -1;
3200 mask &= ~ howto->src_mask;
3201 addend |= mask;
3202 }
3203 msec = sec;
3204 addend =
3205 _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend)
3206 - relocation;
3207 addend += msec->output_section->vma + msec->output_offset;
3208 value = (value & ~ howto->dst_mask) | (addend & howto->dst_mask);
3209 bfd_put_32 (input_bfd, value, contents + rel->r_offset);
3210 }
3211 }
3212 else
3213 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3214 }
3215 else
3216 {
3217 bfd_boolean warned;
3218 bfd_boolean unresolved_reloc;
3219
3220 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3221 r_symndx, symtab_hdr, sym_hashes,
3222 h, sec, relocation,
3223 unresolved_reloc, warned);
3224
3225 if (unresolved_reloc || relocation != 0)
3226 {
3227 /* In these cases, we don't need the relocation value.
3228 We check specially because in some obscure cases
3229 sec->output_section will be NULL. */
3230 switch (r_type)
3231 {
3232 case R_ARM_PC24:
3233 #ifndef OLD_ARM_ABI
3234 case R_ARM_CALL:
3235 case R_ARM_JUMP24:
3236 case R_ARM_PREL31:
3237 #endif
3238 case R_ARM_ABS32:
3239 case R_ARM_THM_PC22:
3240 case R_ARM_PLT32:
3241
3242 if (info->shared
3243 && ((!info->symbolic && h->dynindx != -1)
3244 || !h->def_regular)
3245 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3246 && ((input_section->flags & SEC_ALLOC) != 0
3247 /* DWARF will emit R_ARM_ABS32 relocations in its
3248 sections against symbols defined externally
3249 in shared libraries. We can't do anything
3250 with them here. */
3251 || ((input_section->flags & SEC_DEBUGGING) != 0
3252 && h->def_dynamic))
3253 )
3254 relocation = 0;
3255 break;
3256
3257 case R_ARM_GOTPC:
3258 relocation = 0;
3259 break;
3260
3261 case R_ARM_GOT32:
3262 #ifndef OLD_ARM_ABI
3263 case R_ARM_GOT_PREL:
3264 #endif
3265 if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL
3266 (elf_hash_table (info)->dynamic_sections_created,
3267 info->shared, h))
3268 && (!info->shared
3269 || (!info->symbolic && h->dynindx != -1)
3270 || !h->def_regular))
3271 relocation = 0;
3272 break;
3273
3274 default:
3275 if (unresolved_reloc)
3276 _bfd_error_handler
3277 (_("%B(%A): warning: unresolvable relocation %d against symbol `%s'"),
3278 input_bfd, input_section,
3279 r_type,
3280 h->root.root.string);
3281 break;
3282 }
3283 }
3284 }
3285
3286 if (h != NULL)
3287 name = h->root.root.string;
3288 else
3289 {
3290 name = (bfd_elf_string_from_elf_section
3291 (input_bfd, symtab_hdr->sh_link, sym->st_name));
3292 if (name == NULL || *name == '\0')
3293 name = bfd_section_name (input_bfd, sec);
3294 }
3295
3296 r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
3297 input_section, contents, rel,
3298 relocation, info, sec, name,
3299 (h ? ELF_ST_TYPE (h->type) :
3300 ELF_ST_TYPE (sym->st_info)), h);
3301
3302 if (r != bfd_reloc_ok)
3303 {
3304 const char * msg = (const char *) 0;
3305
3306 switch (r)
3307 {
3308 case bfd_reloc_overflow:
3309 /* If the overflowing reloc was to an undefined symbol,
3310 we have already printed one error message and there
3311 is no point complaining again. */
3312 if ((! h ||
3313 h->root.type != bfd_link_hash_undefined)
3314 && (!((*info->callbacks->reloc_overflow)
3315 (info, (h ? &h->root : NULL), name, howto->name,
3316 (bfd_vma) 0, input_bfd, input_section,
3317 rel->r_offset))))
3318 return FALSE;
3319 break;
3320
3321 case bfd_reloc_undefined:
3322 if (!((*info->callbacks->undefined_symbol)
3323 (info, name, input_bfd, input_section,
3324 rel->r_offset, TRUE)))
3325 return FALSE;
3326 break;
3327
3328 case bfd_reloc_outofrange:
3329 msg = _("internal error: out of range error");
3330 goto common_error;
3331
3332 case bfd_reloc_notsupported:
3333 msg = _("internal error: unsupported relocation error");
3334 goto common_error;
3335
3336 case bfd_reloc_dangerous:
3337 msg = _("internal error: dangerous error");
3338 goto common_error;
3339
3340 default:
3341 msg = _("internal error: unknown error");
3342 /* fall through */
3343
3344 common_error:
3345 if (!((*info->callbacks->warning)
3346 (info, msg, name, input_bfd, input_section,
3347 rel->r_offset)))
3348 return FALSE;
3349 break;
3350 }
3351 }
3352 }
3353
3354 return TRUE;
3355 }
3356
3357 /* Set the right machine number. */
3358
3359 static bfd_boolean
3360 elf32_arm_object_p (bfd *abfd)
3361 {
3362 unsigned int mach;
3363
3364 mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION);
3365
3366 if (mach != bfd_mach_arm_unknown)
3367 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3368
3369 else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT)
3370 bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312);
3371
3372 else
3373 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3374
3375 return TRUE;
3376 }
3377
3378 /* Function to keep ARM specific flags in the ELF header. */
3379
3380 static bfd_boolean
3381 elf32_arm_set_private_flags (bfd *abfd, flagword flags)
3382 {
3383 if (elf_flags_init (abfd)
3384 && elf_elfheader (abfd)->e_flags != flags)
3385 {
3386 if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN)
3387 {
3388 if (flags & EF_ARM_INTERWORK)
3389 (*_bfd_error_handler)
3390 (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
3391 abfd);
3392 else
3393 _bfd_error_handler
3394 (_("Warning: Clearing the interworking flag of %B due to outside request"),
3395 abfd);
3396 }
3397 }
3398 else
3399 {
3400 elf_elfheader (abfd)->e_flags = flags;
3401 elf_flags_init (abfd) = TRUE;
3402 }
3403
3404 return TRUE;
3405 }
3406
3407 /* Copy backend specific data from one object module to another. */
3408
3409 static bfd_boolean
3410 elf32_arm_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
3411 {
3412 flagword in_flags;
3413 flagword out_flags;
3414
3415 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3416 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3417 return TRUE;
3418
3419 in_flags = elf_elfheader (ibfd)->e_flags;
3420 out_flags = elf_elfheader (obfd)->e_flags;
3421
3422 if (elf_flags_init (obfd)
3423 && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN
3424 && in_flags != out_flags)
3425 {
3426 /* Cannot mix APCS26 and APCS32 code. */
3427 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3428 return FALSE;
3429
3430 /* Cannot mix float APCS and non-float APCS code. */
3431 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3432 return FALSE;
3433
3434 /* If the src and dest have different interworking flags
3435 then turn off the interworking bit. */
3436 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3437 {
3438 if (out_flags & EF_ARM_INTERWORK)
3439 _bfd_error_handler
3440 (_("Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
3441 obfd, ibfd);
3442
3443 in_flags &= ~EF_ARM_INTERWORK;
3444 }
3445
3446 /* Likewise for PIC, though don't warn for this case. */
3447 if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC))
3448 in_flags &= ~EF_ARM_PIC;
3449 }
3450
3451 elf_elfheader (obfd)->e_flags = in_flags;
3452 elf_flags_init (obfd) = TRUE;
3453
3454 /* Also copy the EI_OSABI field. */
3455 elf_elfheader (obfd)->e_ident[EI_OSABI] =
3456 elf_elfheader (ibfd)->e_ident[EI_OSABI];
3457
3458 return TRUE;
3459 }
3460
3461 /* Merge backend specific data from an object file to the output
3462 object file when linking. */
3463
3464 static bfd_boolean
3465 elf32_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
3466 {
3467 flagword out_flags;
3468 flagword in_flags;
3469 bfd_boolean flags_compatible = TRUE;
3470 asection *sec;
3471
3472 /* Check if we have the same endianess. */
3473 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
3474 return FALSE;
3475
3476 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3477 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3478 return TRUE;
3479
3480 /* The input BFD must have had its flags initialised. */
3481 /* The following seems bogus to me -- The flags are initialized in
3482 the assembler but I don't think an elf_flags_init field is
3483 written into the object. */
3484 /* BFD_ASSERT (elf_flags_init (ibfd)); */
3485
3486 in_flags = elf_elfheader (ibfd)->e_flags;
3487 out_flags = elf_elfheader (obfd)->e_flags;
3488
3489 if (!elf_flags_init (obfd))
3490 {
3491 /* If the input is the default architecture and had the default
3492 flags then do not bother setting the flags for the output
3493 architecture, instead allow future merges to do this. If no
3494 future merges ever set these flags then they will retain their
3495 uninitialised values, which surprise surprise, correspond
3496 to the default values. */
3497 if (bfd_get_arch_info (ibfd)->the_default
3498 && elf_elfheader (ibfd)->e_flags == 0)
3499 return TRUE;
3500
3501 elf_flags_init (obfd) = TRUE;
3502 elf_elfheader (obfd)->e_flags = in_flags;
3503
3504 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
3505 && bfd_get_arch_info (obfd)->the_default)
3506 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
3507
3508 return TRUE;
3509 }
3510
3511 /* Determine what should happen if the input ARM architecture
3512 does not match the output ARM architecture. */
3513 if (! bfd_arm_merge_machines (ibfd, obfd))
3514 return FALSE;
3515
3516 /* Identical flags must be compatible. */
3517 if (in_flags == out_flags)
3518 return TRUE;
3519
3520 /* Check to see if the input BFD actually contains any sections. If
3521 not, its flags may not have been initialised either, but it
3522 cannot actually cause any incompatibility. Do not short-circuit
3523 dynamic objects; their section list may be emptied by
3524 elf_link_add_object_symbols.
3525
3526 Also check to see if there are no code sections in the input.
3527 In this case there is no need to check for code specific flags.
3528 XXX - do we need to worry about floating-point format compatability
3529 in data sections ? */
3530 if (!(ibfd->flags & DYNAMIC))
3531 {
3532 bfd_boolean null_input_bfd = TRUE;
3533 bfd_boolean only_data_sections = TRUE;
3534
3535 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
3536 {
3537 /* Ignore synthetic glue sections. */
3538 if (strcmp (sec->name, ".glue_7")
3539 && strcmp (sec->name, ".glue_7t"))
3540 {
3541 if ((bfd_get_section_flags (ibfd, sec)
3542 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3543 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3544 only_data_sections = FALSE;
3545
3546 null_input_bfd = FALSE;
3547 break;
3548 }
3549 }
3550
3551 if (null_input_bfd || only_data_sections)
3552 return TRUE;
3553 }
3554
3555 /* Complain about various flag mismatches. */
3556 if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags))
3557 {
3558 _bfd_error_handler
3559 (_("ERROR: Source object %B has EABI version %d, but target %B has EABI version %d"),
3560 ibfd, obfd,
3561 (in_flags & EF_ARM_EABIMASK) >> 24,
3562 (out_flags & EF_ARM_EABIMASK) >> 24);
3563 return FALSE;
3564 }
3565
3566 /* Not sure what needs to be checked for EABI versions >= 1. */
3567 if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN)
3568 {
3569 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3570 {
3571 _bfd_error_handler
3572 (_("ERROR: %B is compiled for APCS-%d, whereas target %B uses APCS-%d"),
3573 ibfd, obfd,
3574 in_flags & EF_ARM_APCS_26 ? 26 : 32,
3575 out_flags & EF_ARM_APCS_26 ? 26 : 32);
3576 flags_compatible = FALSE;
3577 }
3578
3579 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3580 {
3581 if (in_flags & EF_ARM_APCS_FLOAT)
3582 _bfd_error_handler
3583 (_("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers"),
3584 ibfd, obfd);
3585 else
3586 _bfd_error_handler
3587 (_("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers"),
3588 ibfd, obfd);
3589
3590 flags_compatible = FALSE;
3591 }
3592
3593 if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT))
3594 {
3595 if (in_flags & EF_ARM_VFP_FLOAT)
3596 _bfd_error_handler
3597 (_("ERROR: %B uses VFP instructions, whereas %B does not"),
3598 ibfd, obfd);
3599 else
3600 _bfd_error_handler
3601 (_("ERROR: %B uses FPA instructions, whereas %B does not"),
3602 ibfd, obfd);
3603
3604 flags_compatible = FALSE;
3605 }
3606
3607 if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT))
3608 {
3609 if (in_flags & EF_ARM_MAVERICK_FLOAT)
3610 _bfd_error_handler
3611 (_("ERROR: %B uses Maverick instructions, whereas %B does not"),
3612 ibfd, obfd);
3613 else
3614 _bfd_error_handler
3615 (_("ERROR: %B does not use Maverick instructions, whereas %B does"),
3616 ibfd, obfd);
3617
3618 flags_compatible = FALSE;
3619 }
3620
3621 #ifdef EF_ARM_SOFT_FLOAT
3622 if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT))
3623 {
3624 /* We can allow interworking between code that is VFP format
3625 layout, and uses either soft float or integer regs for
3626 passing floating point arguments and results. We already
3627 know that the APCS_FLOAT flags match; similarly for VFP
3628 flags. */
3629 if ((in_flags & EF_ARM_APCS_FLOAT) != 0
3630 || (in_flags & EF_ARM_VFP_FLOAT) == 0)
3631 {
3632 if (in_flags & EF_ARM_SOFT_FLOAT)
3633 _bfd_error_handler
3634 (_("ERROR: %B uses software FP, whereas %B uses hardware FP"),
3635 ibfd, obfd);
3636 else
3637 _bfd_error_handler
3638 (_("ERROR: %B uses hardware FP, whereas %B uses software FP"),
3639 ibfd, obfd);
3640
3641 flags_compatible = FALSE;
3642 }
3643 }
3644 #endif
3645
3646 /* Interworking mismatch is only a warning. */
3647 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3648 {
3649 if (in_flags & EF_ARM_INTERWORK)
3650 {
3651 _bfd_error_handler
3652 (_("Warning: %B supports interworking, whereas %B does not"),
3653 ibfd, obfd);
3654 }
3655 else
3656 {
3657 _bfd_error_handler
3658 (_("Warning: %B does not support interworking, whereas %B does"),
3659 ibfd, obfd);
3660 }
3661 }
3662 }
3663
3664 return flags_compatible;
3665 }
3666
3667 /* Display the flags field. */
3668
3669 static bfd_boolean
3670 elf32_arm_print_private_bfd_data (bfd *abfd, void * ptr)
3671 {
3672 FILE * file = (FILE *) ptr;
3673 unsigned long flags;
3674
3675 BFD_ASSERT (abfd != NULL && ptr != NULL);
3676
3677 /* Print normal ELF private data. */
3678 _bfd_elf_print_private_bfd_data (abfd, ptr);
3679
3680 flags = elf_elfheader (abfd)->e_flags;
3681 /* Ignore init flag - it may not be set, despite the flags field
3682 containing valid data. */
3683
3684 /* xgettext:c-format */
3685 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
3686
3687 switch (EF_ARM_EABI_VERSION (flags))
3688 {
3689 case EF_ARM_EABI_UNKNOWN:
3690 /* The following flag bits are GNU extensions and not part of the
3691 official ARM ELF extended ABI. Hence they are only decoded if
3692 the EABI version is not set. */
3693 if (flags & EF_ARM_INTERWORK)
3694 fprintf (file, _(" [interworking enabled]"));
3695
3696 if (flags & EF_ARM_APCS_26)
3697 fprintf (file, " [APCS-26]");
3698 else
3699 fprintf (file, " [APCS-32]");
3700
3701 if (flags & EF_ARM_VFP_FLOAT)
3702 fprintf (file, _(" [VFP float format]"));
3703 else if (flags & EF_ARM_MAVERICK_FLOAT)
3704 fprintf (file, _(" [Maverick float format]"));
3705 else
3706 fprintf (file, _(" [FPA float format]"));
3707
3708 if (flags & EF_ARM_APCS_FLOAT)
3709 fprintf (file, _(" [floats passed in float registers]"));
3710
3711 if (flags & EF_ARM_PIC)
3712 fprintf (file, _(" [position independent]"));
3713
3714 if (flags & EF_ARM_NEW_ABI)
3715 fprintf (file, _(" [new ABI]"));
3716
3717 if (flags & EF_ARM_OLD_ABI)
3718 fprintf (file, _(" [old ABI]"));
3719
3720 if (flags & EF_ARM_SOFT_FLOAT)
3721 fprintf (file, _(" [software FP]"));
3722
3723 flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT
3724 | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI
3725 | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT
3726 | EF_ARM_MAVERICK_FLOAT);
3727 break;
3728
3729 case EF_ARM_EABI_VER1:
3730 fprintf (file, _(" [Version1 EABI]"));
3731
3732 if (flags & EF_ARM_SYMSARESORTED)
3733 fprintf (file, _(" [sorted symbol table]"));
3734 else
3735 fprintf (file, _(" [unsorted symbol table]"));
3736
3737 flags &= ~ EF_ARM_SYMSARESORTED;
3738 break;
3739
3740 case EF_ARM_EABI_VER2:
3741 fprintf (file, _(" [Version2 EABI]"));
3742
3743 if (flags & EF_ARM_SYMSARESORTED)
3744 fprintf (file, _(" [sorted symbol table]"));
3745 else
3746 fprintf (file, _(" [unsorted symbol table]"));
3747
3748 if (flags & EF_ARM_DYNSYMSUSESEGIDX)
3749 fprintf (file, _(" [dynamic symbols use segment index]"));
3750
3751 if (flags & EF_ARM_MAPSYMSFIRST)
3752 fprintf (file, _(" [mapping symbols precede others]"));
3753
3754 flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX
3755 | EF_ARM_MAPSYMSFIRST);
3756 break;
3757
3758 case EF_ARM_EABI_VER3:
3759 fprintf (file, _(" [Version3 EABI]"));
3760 break;
3761
3762 case EF_ARM_EABI_VER4:
3763 fprintf (file, _(" [Version4 EABI]"));
3764
3765 if (flags & EF_ARM_BE8)
3766 fprintf (file, _(" [BE8]"));
3767
3768 if (flags & EF_ARM_LE8)
3769 fprintf (file, _(" [LE8]"));
3770
3771 flags &= ~(EF_ARM_LE8 | EF_ARM_BE8);
3772 break;
3773
3774 default:
3775 fprintf (file, _(" <EABI version unrecognised>"));
3776 break;
3777 }
3778
3779 flags &= ~ EF_ARM_EABIMASK;
3780
3781 if (flags & EF_ARM_RELEXEC)
3782 fprintf (file, _(" [relocatable executable]"));
3783
3784 if (flags & EF_ARM_HASENTRY)
3785 fprintf (file, _(" [has entry point]"));
3786
3787 flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY);
3788
3789 if (flags)
3790 fprintf (file, _("<Unrecognised flag bits set>"));
3791
3792 fputc ('\n', file);
3793
3794 return TRUE;
3795 }
3796
3797 static int
3798 elf32_arm_get_symbol_type (Elf_Internal_Sym * elf_sym, int type)
3799 {
3800 switch (ELF_ST_TYPE (elf_sym->st_info))
3801 {
3802 case STT_ARM_TFUNC:
3803 return ELF_ST_TYPE (elf_sym->st_info);
3804
3805 case STT_ARM_16BIT:
3806 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
3807 This allows us to distinguish between data used by Thumb instructions
3808 and non-data (which is probably code) inside Thumb regions of an
3809 executable. */
3810 if (type != STT_OBJECT)
3811 return ELF_ST_TYPE (elf_sym->st_info);
3812 break;
3813
3814 default:
3815 break;
3816 }
3817
3818 return type;
3819 }
3820
3821 static asection *
3822 elf32_arm_gc_mark_hook (asection * sec,
3823 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3824 Elf_Internal_Rela * rel,
3825 struct elf_link_hash_entry * h,
3826 Elf_Internal_Sym * sym)
3827 {
3828 if (h != NULL)
3829 {
3830 switch (ELF32_R_TYPE (rel->r_info))
3831 {
3832 case R_ARM_GNU_VTINHERIT:
3833 case R_ARM_GNU_VTENTRY:
3834 break;
3835
3836 default:
3837 switch (h->root.type)
3838 {
3839 case bfd_link_hash_defined:
3840 case bfd_link_hash_defweak:
3841 return h->root.u.def.section;
3842
3843 case bfd_link_hash_common:
3844 return h->root.u.c.p->section;
3845
3846 default:
3847 break;
3848 }
3849 }
3850 }
3851 else
3852 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
3853
3854 return NULL;
3855 }
3856
3857 /* Update the got entry reference counts for the section being removed. */
3858
3859 static bfd_boolean
3860 elf32_arm_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
3861 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3862 asection * sec ATTRIBUTE_UNUSED,
3863 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
3864 {
3865 Elf_Internal_Shdr *symtab_hdr;
3866 struct elf_link_hash_entry **sym_hashes;
3867 bfd_signed_vma *local_got_refcounts;
3868 const Elf_Internal_Rela *rel, *relend;
3869 struct elf32_arm_link_hash_table * globals;
3870
3871 globals = elf32_arm_hash_table (info);
3872
3873 elf_section_data (sec)->local_dynrel = NULL;
3874
3875 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3876 sym_hashes = elf_sym_hashes (abfd);
3877 local_got_refcounts = elf_local_got_refcounts (abfd);
3878
3879 relend = relocs + sec->reloc_count;
3880 for (rel = relocs; rel < relend; rel++)
3881 {
3882 unsigned long r_symndx;
3883 struct elf_link_hash_entry *h = NULL;
3884 int r_type;
3885
3886 r_symndx = ELF32_R_SYM (rel->r_info);
3887 if (r_symndx >= symtab_hdr->sh_info)
3888 {
3889 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3890 while (h->root.type == bfd_link_hash_indirect
3891 || h->root.type == bfd_link_hash_warning)
3892 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3893 }
3894
3895 r_type = ELF32_R_TYPE (rel->r_info);
3896 #ifndef OLD_ARM_ABI
3897 r_type = arm_real_reloc_type (globals, r_type);
3898 #endif
3899 switch (r_type)
3900 {
3901 case R_ARM_GOT32:
3902 #ifndef OLD_ARM_ABI
3903 case R_ARM_GOT_PREL:
3904 #endif
3905 if (h != NULL)
3906 {
3907 if (h->got.refcount > 0)
3908 h->got.refcount -= 1;
3909 }
3910 else if (local_got_refcounts != NULL)
3911 {
3912 if (local_got_refcounts[r_symndx] > 0)
3913 local_got_refcounts[r_symndx] -= 1;
3914 }
3915 break;
3916
3917 case R_ARM_ABS32:
3918 case R_ARM_REL32:
3919 case R_ARM_PC24:
3920 case R_ARM_PLT32:
3921 #ifndef OLD_ARM_ABI
3922 case R_ARM_CALL:
3923 case R_ARM_JUMP24:
3924 case R_ARM_PREL31:
3925 #endif
3926 case R_ARM_THM_PC22:
3927 /* Should the interworking branches be here also? */
3928
3929 if (h != NULL)
3930 {
3931 struct elf32_arm_link_hash_entry *eh;
3932 struct elf32_arm_relocs_copied **pp;
3933 struct elf32_arm_relocs_copied *p;
3934
3935 eh = (struct elf32_arm_link_hash_entry *) h;
3936
3937 if (h->plt.refcount > 0)
3938 {
3939 h->plt.refcount -= 1;
3940 if (ELF32_R_TYPE (rel->r_info) == R_ARM_THM_PC22)
3941 eh->plt_thumb_refcount--;
3942 }
3943
3944 if (r_type == R_ARM_ABS32
3945 || r_type == R_ARM_REL32)
3946 {
3947 for (pp = &eh->relocs_copied; (p = *pp) != NULL;
3948 pp = &p->next)
3949 if (p->section == sec)
3950 {
3951 p->count -= 1;
3952 if (p->count == 0)
3953 *pp = p->next;
3954 break;
3955 }
3956 }
3957 }
3958 break;
3959
3960 default:
3961 break;
3962 }
3963 }
3964
3965 return TRUE;
3966 }
3967
3968 /* Look through the relocs for a section during the first phase. */
3969
3970 static bfd_boolean
3971 elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
3972 asection *sec, const Elf_Internal_Rela *relocs)
3973 {
3974 Elf_Internal_Shdr *symtab_hdr;
3975 struct elf_link_hash_entry **sym_hashes;
3976 struct elf_link_hash_entry **sym_hashes_end;
3977 const Elf_Internal_Rela *rel;
3978 const Elf_Internal_Rela *rel_end;
3979 bfd *dynobj;
3980 asection *sreloc;
3981 bfd_vma *local_got_offsets;
3982 struct elf32_arm_link_hash_table *htab;
3983
3984 if (info->relocatable)
3985 return TRUE;
3986
3987 htab = elf32_arm_hash_table (info);
3988 sreloc = NULL;
3989
3990 /* Create dynamic sections for relocatable executables so that we can
3991 copy relocations. */
3992 if (htab->root.is_relocatable_executable
3993 && ! htab->root.dynamic_sections_created)
3994 {
3995 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3996 return FALSE;
3997 }
3998
3999 dynobj = elf_hash_table (info)->dynobj;
4000 local_got_offsets = elf_local_got_offsets (abfd);
4001
4002 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4003 sym_hashes = elf_sym_hashes (abfd);
4004 sym_hashes_end = sym_hashes
4005 + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
4006
4007 if (!elf_bad_symtab (abfd))
4008 sym_hashes_end -= symtab_hdr->sh_info;
4009
4010 rel_end = relocs + sec->reloc_count;
4011 for (rel = relocs; rel < rel_end; rel++)
4012 {
4013 struct elf_link_hash_entry *h;
4014 struct elf32_arm_link_hash_entry *eh;
4015 unsigned long r_symndx;
4016 int r_type;
4017
4018 r_symndx = ELF32_R_SYM (rel->r_info);
4019 r_type = ELF32_R_TYPE (rel->r_info);
4020 #ifndef OLD_ARM_ABI
4021 r_type = arm_real_reloc_type (htab, r_type);
4022 #endif
4023 if (r_symndx < symtab_hdr->sh_info)
4024 h = NULL;
4025 else
4026 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4027
4028 eh = (struct elf32_arm_link_hash_entry *) h;
4029
4030 switch (r_type)
4031 {
4032 case R_ARM_GOT32:
4033 #ifndef OLD_ARM_ABI
4034 case R_ARM_GOT_PREL:
4035 #endif
4036 /* This symbol requires a global offset table entry. */
4037 if (h != NULL)
4038 {
4039 h->got.refcount++;
4040 }
4041 else
4042 {
4043 bfd_signed_vma *local_got_refcounts;
4044
4045 /* This is a global offset table entry for a local symbol. */
4046 local_got_refcounts = elf_local_got_refcounts (abfd);
4047 if (local_got_refcounts == NULL)
4048 {
4049 bfd_size_type size;
4050
4051 size = symtab_hdr->sh_info;
4052 size *= (sizeof (bfd_signed_vma) + sizeof (char));
4053 local_got_refcounts = bfd_zalloc (abfd, size);
4054 if (local_got_refcounts == NULL)
4055 return FALSE;
4056 elf_local_got_refcounts (abfd) = local_got_refcounts;
4057 }
4058 local_got_refcounts[r_symndx] += 1;
4059 }
4060 if (r_type == R_ARM_GOT32)
4061 break;
4062 /* Fall through. */
4063
4064 case R_ARM_GOTOFF:
4065 case R_ARM_GOTPC:
4066 if (htab->sgot == NULL)
4067 {
4068 if (htab->root.dynobj == NULL)
4069 htab->root.dynobj = abfd;
4070 if (!create_got_section (htab->root.dynobj, info))
4071 return FALSE;
4072 }
4073 break;
4074
4075 case R_ARM_ABS32:
4076 case R_ARM_REL32:
4077 case R_ARM_PC24:
4078 case R_ARM_PLT32:
4079 #ifndef OLD_ARM_ABI
4080 case R_ARM_CALL:
4081 case R_ARM_JUMP24:
4082 case R_ARM_PREL31:
4083 #endif
4084 case R_ARM_THM_PC22:
4085 /* Should the interworking branches be listed here? */
4086 if (h != NULL)
4087 {
4088 /* If this reloc is in a read-only section, we might
4089 need a copy reloc. We can't check reliably at this
4090 stage whether the section is read-only, as input
4091 sections have not yet been mapped to output sections.
4092 Tentatively set the flag for now, and correct in
4093 adjust_dynamic_symbol. */
4094 if (!info->shared)
4095 h->non_got_ref = 1;
4096
4097 /* We may need a .plt entry if the function this reloc
4098 refers to is in a different object. We can't tell for
4099 sure yet, because something later might force the
4100 symbol local. */
4101 if (r_type == R_ARM_PC24
4102 #ifndef OLD_ARM_ABI
4103 || r_type == R_ARM_CALL
4104 || r_type == R_ARM_JUMP24
4105 || r_type == R_ARM_PREL31
4106 #endif
4107 || r_type == R_ARM_PLT32
4108 || r_type == R_ARM_THM_PC22)
4109 h->needs_plt = 1;
4110
4111 /* If we create a PLT entry, this relocation will reference
4112 it, even if it's an ABS32 relocation. */
4113 h->plt.refcount += 1;
4114
4115 if (r_type == R_ARM_THM_PC22)
4116 eh->plt_thumb_refcount += 1;
4117 }
4118
4119 /* If we are creating a shared library or relocatable executable,
4120 and this is a reloc against a global symbol, or a non PC
4121 relative reloc against a local symbol, then we need to copy
4122 the reloc into the shared library. However, if we are linking
4123 with -Bsymbolic, we do not need to copy a reloc against a
4124 global symbol which is defined in an object we are
4125 including in the link (i.e., DEF_REGULAR is set). At
4126 this point we have not seen all the input files, so it is
4127 possible that DEF_REGULAR is not set now but will be set
4128 later (it is never cleared). We account for that
4129 possibility below by storing information in the
4130 relocs_copied field of the hash table entry. */
4131 if ((info->shared || htab->root.is_relocatable_executable)
4132 && (sec->flags & SEC_ALLOC) != 0
4133 && ((r_type != R_ARM_PC24
4134 && r_type != R_ARM_PLT32
4135 #ifndef OLD_ARM_ABI
4136 && r_type != R_ARM_CALL
4137 && r_type != R_ARM_JUMP24
4138 && r_type != R_ARM_PREL31
4139 #endif
4140 && r_type != R_ARM_REL32
4141 && r_type != R_ARM_THM_PC22)
4142 || (h != NULL
4143 && (! info->symbolic
4144 || !h->def_regular))))
4145 {
4146 struct elf32_arm_relocs_copied *p, **head;
4147
4148 /* When creating a shared object, we must copy these
4149 reloc types into the output file. We create a reloc
4150 section in dynobj and make room for this reloc. */
4151 if (sreloc == NULL)
4152 {
4153 const char * name;
4154
4155 name = (bfd_elf_string_from_elf_section
4156 (abfd,
4157 elf_elfheader (abfd)->e_shstrndx,
4158 elf_section_data (sec)->rel_hdr.sh_name));
4159 if (name == NULL)
4160 return FALSE;
4161
4162 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
4163 && strcmp (bfd_get_section_name (abfd, sec),
4164 name + 4) == 0);
4165
4166 sreloc = bfd_get_section_by_name (dynobj, name);
4167 if (sreloc == NULL)
4168 {
4169 flagword flags;
4170
4171 sreloc = bfd_make_section (dynobj, name);
4172 flags = (SEC_HAS_CONTENTS | SEC_READONLY
4173 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
4174 if ((sec->flags & SEC_ALLOC) != 0
4175 /* BPABI objects never have dynamic
4176 relocations mapped. */
4177 && !htab->symbian_p)
4178 flags |= SEC_ALLOC | SEC_LOAD;
4179 if (sreloc == NULL
4180 || ! bfd_set_section_flags (dynobj, sreloc, flags)
4181 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
4182 return FALSE;
4183 }
4184
4185 elf_section_data (sec)->sreloc = sreloc;
4186 }
4187
4188 /* If this is a global symbol, we count the number of
4189 relocations we need for this symbol. */
4190 if (h != NULL)
4191 {
4192 head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied;
4193 }
4194 else
4195 {
4196 /* Track dynamic relocs needed for local syms too.
4197 We really need local syms available to do this
4198 easily. Oh well. */
4199
4200 asection *s;
4201 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
4202 sec, r_symndx);
4203 if (s == NULL)
4204 return FALSE;
4205
4206 head = ((struct elf32_arm_relocs_copied **)
4207 &elf_section_data (s)->local_dynrel);
4208 }
4209
4210 p = *head;
4211 if (p == NULL || p->section != sec)
4212 {
4213 bfd_size_type amt = sizeof *p;
4214
4215 p = bfd_alloc (htab->root.dynobj, amt);
4216 if (p == NULL)
4217 return FALSE;
4218 p->next = *head;
4219 *head = p;
4220 p->section = sec;
4221 p->count = 0;
4222 }
4223
4224 if (r_type == R_ARM_ABS32
4225 || r_type == R_ARM_REL32)
4226 p->count += 1;
4227 }
4228 break;
4229
4230 /* This relocation describes the C++ object vtable hierarchy.
4231 Reconstruct it for later use during GC. */
4232 case R_ARM_GNU_VTINHERIT:
4233 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4234 return FALSE;
4235 break;
4236
4237 /* This relocation describes which C++ vtable entries are actually
4238 used. Record for later use during GC. */
4239 case R_ARM_GNU_VTENTRY:
4240 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
4241 return FALSE;
4242 break;
4243 }
4244 }
4245
4246 return TRUE;
4247 }
4248
4249 static bfd_boolean
4250 is_arm_mapping_symbol_name (const char * name)
4251 {
4252 return (name != NULL)
4253 && (name[0] == '$')
4254 && ((name[1] == 'a') || (name[1] == 't') || (name[1] == 'd'))
4255 && (name[2] == 0);
4256 }
4257
4258 /* Treat mapping symbols as special target symbols. */
4259
4260 static bfd_boolean
4261 elf32_arm_is_target_special_symbol (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym)
4262 {
4263 return is_arm_mapping_symbol_name (sym->name);
4264 }
4265
4266 /* This is a copy of elf_find_function() from elf.c except that
4267 ARM mapping symbols are ignored when looking for function names
4268 and STT_ARM_TFUNC is considered to a function type. */
4269
4270 static bfd_boolean
4271 arm_elf_find_function (bfd * abfd ATTRIBUTE_UNUSED,
4272 asection * section,
4273 asymbol ** symbols,
4274 bfd_vma offset,
4275 const char ** filename_ptr,
4276 const char ** functionname_ptr)
4277 {
4278 const char * filename = NULL;
4279 asymbol * func = NULL;
4280 bfd_vma low_func = 0;
4281 asymbol ** p;
4282
4283 for (p = symbols; *p != NULL; p++)
4284 {
4285 elf_symbol_type *q;
4286
4287 q = (elf_symbol_type *) *p;
4288
4289 switch (ELF_ST_TYPE (q->internal_elf_sym.st_info))
4290 {
4291 default:
4292 break;
4293 case STT_FILE:
4294 filename = bfd_asymbol_name (&q->symbol);
4295 break;
4296 case STT_FUNC:
4297 case STT_ARM_TFUNC:
4298 /* Skip $a and $t symbols. */
4299 if ((q->symbol.flags & BSF_LOCAL)
4300 && is_arm_mapping_symbol_name (q->symbol.name))
4301 continue;
4302 /* Fall through. */
4303 case STT_NOTYPE:
4304 if (bfd_get_section (&q->symbol) == section
4305 && q->symbol.value >= low_func
4306 && q->symbol.value <= offset)
4307 {
4308 func = (asymbol *) q;
4309 low_func = q->symbol.value;
4310 }
4311 break;
4312 }
4313 }
4314
4315 if (func == NULL)
4316 return FALSE;
4317
4318 if (filename_ptr)
4319 *filename_ptr = filename;
4320 if (functionname_ptr)
4321 *functionname_ptr = bfd_asymbol_name (func);
4322
4323 return TRUE;
4324 }
4325
4326
4327 /* Find the nearest line to a particular section and offset, for error
4328 reporting. This code is a duplicate of the code in elf.c, except
4329 that it uses arm_elf_find_function. */
4330
4331 static bfd_boolean
4332 elf32_arm_find_nearest_line (bfd * abfd,
4333 asection * section,
4334 asymbol ** symbols,
4335 bfd_vma offset,
4336 const char ** filename_ptr,
4337 const char ** functionname_ptr,
4338 unsigned int * line_ptr)
4339 {
4340 bfd_boolean found = FALSE;
4341
4342 /* We skip _bfd_dwarf1_find_nearest_line since no known ARM toolchain uses it. */
4343
4344 if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
4345 filename_ptr, functionname_ptr,
4346 line_ptr, 0,
4347 & elf_tdata (abfd)->dwarf2_find_line_info))
4348 {
4349 if (!*functionname_ptr)
4350 arm_elf_find_function (abfd, section, symbols, offset,
4351 *filename_ptr ? NULL : filename_ptr,
4352 functionname_ptr);
4353
4354 return TRUE;
4355 }
4356
4357 if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset,
4358 & found, filename_ptr,
4359 functionname_ptr, line_ptr,
4360 & elf_tdata (abfd)->line_info))
4361 return FALSE;
4362
4363 if (found && (*functionname_ptr || *line_ptr))
4364 return TRUE;
4365
4366 if (symbols == NULL)
4367 return FALSE;
4368
4369 if (! arm_elf_find_function (abfd, section, symbols, offset,
4370 filename_ptr, functionname_ptr))
4371 return FALSE;
4372
4373 *line_ptr = 0;
4374 return TRUE;
4375 }
4376
4377 /* Adjust a symbol defined by a dynamic object and referenced by a
4378 regular object. The current definition is in some section of the
4379 dynamic object, but we're not including those sections. We have to
4380 change the definition to something the rest of the link can
4381 understand. */
4382
4383 static bfd_boolean
4384 elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info,
4385 struct elf_link_hash_entry * h)
4386 {
4387 bfd * dynobj;
4388 asection * s;
4389 unsigned int power_of_two;
4390 struct elf32_arm_link_hash_entry * eh;
4391 struct elf32_arm_link_hash_table *globals;
4392
4393 globals = elf32_arm_hash_table (info);
4394 dynobj = elf_hash_table (info)->dynobj;
4395
4396 /* Make sure we know what is going on here. */
4397 BFD_ASSERT (dynobj != NULL
4398 && (h->needs_plt
4399 || h->u.weakdef != NULL
4400 || (h->def_dynamic
4401 && h->ref_regular
4402 && !h->def_regular)));
4403
4404 eh = (struct elf32_arm_link_hash_entry *) h;
4405
4406 /* If this is a function, put it in the procedure linkage table. We
4407 will fill in the contents of the procedure linkage table later,
4408 when we know the address of the .got section. */
4409 if (h->type == STT_FUNC || h->type == STT_ARM_TFUNC
4410 || h->needs_plt)
4411 {
4412 if (h->plt.refcount <= 0
4413 || SYMBOL_CALLS_LOCAL (info, h)
4414 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4415 && h->root.type == bfd_link_hash_undefweak))
4416 {
4417 /* This case can occur if we saw a PLT32 reloc in an input
4418 file, but the symbol was never referred to by a dynamic
4419 object, or if all references were garbage collected. In
4420 such a case, we don't actually need to build a procedure
4421 linkage table, and we can just do a PC24 reloc instead. */
4422 h->plt.offset = (bfd_vma) -1;
4423 eh->plt_thumb_refcount = 0;
4424 h->needs_plt = 0;
4425 }
4426
4427 return TRUE;
4428 }
4429 else
4430 {
4431 /* It's possible that we incorrectly decided a .plt reloc was
4432 needed for an R_ARM_PC24 or similar reloc to a non-function sym
4433 in check_relocs. We can't decide accurately between function
4434 and non-function syms in check-relocs; Objects loaded later in
4435 the link may change h->type. So fix it now. */
4436 h->plt.offset = (bfd_vma) -1;
4437 eh->plt_thumb_refcount = 0;
4438 }
4439
4440 /* If this is a weak symbol, and there is a real definition, the
4441 processor independent code will have arranged for us to see the
4442 real definition first, and we can just use the same value. */
4443 if (h->u.weakdef != NULL)
4444 {
4445 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
4446 || h->u.weakdef->root.type == bfd_link_hash_defweak);
4447 h->root.u.def.section = h->u.weakdef->root.u.def.section;
4448 h->root.u.def.value = h->u.weakdef->root.u.def.value;
4449 return TRUE;
4450 }
4451
4452 /* This is a reference to a symbol defined by a dynamic object which
4453 is not a function. */
4454
4455 /* If we are creating a shared library, we must presume that the
4456 only references to the symbol are via the global offset table.
4457 For such cases we need not do anything here; the relocations will
4458 be handled correctly by relocate_section. Relocatable executables
4459 can reference data in shared objects directly, so we don't need to
4460 do anything here. */
4461 if (info->shared || globals->root.is_relocatable_executable)
4462 return TRUE;
4463
4464 /* We must allocate the symbol in our .dynbss section, which will
4465 become part of the .bss section of the executable. There will be
4466 an entry for this symbol in the .dynsym section. The dynamic
4467 object will contain position independent code, so all references
4468 from the dynamic object to this symbol will go through the global
4469 offset table. The dynamic linker will use the .dynsym entry to
4470 determine the address it must put in the global offset table, so
4471 both the dynamic object and the regular object will refer to the
4472 same memory location for the variable. */
4473 s = bfd_get_section_by_name (dynobj, ".dynbss");
4474 BFD_ASSERT (s != NULL);
4475
4476 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
4477 copy the initial value out of the dynamic object and into the
4478 runtime process image. We need to remember the offset into the
4479 .rel.bss section we are going to use. */
4480 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
4481 {
4482 asection *srel;
4483
4484 srel = bfd_get_section_by_name (dynobj, ".rel.bss");
4485 BFD_ASSERT (srel != NULL);
4486 srel->size += sizeof (Elf32_External_Rel);
4487 h->needs_copy = 1;
4488 }
4489
4490 /* We need to figure out the alignment required for this symbol. I
4491 have no idea how ELF linkers handle this. */
4492 power_of_two = bfd_log2 (h->size);
4493 if (power_of_two > 3)
4494 power_of_two = 3;
4495
4496 /* Apply the required alignment. */
4497 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
4498 if (power_of_two > bfd_get_section_alignment (dynobj, s))
4499 {
4500 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
4501 return FALSE;
4502 }
4503
4504 /* Define the symbol as being at this point in the section. */
4505 h->root.u.def.section = s;
4506 h->root.u.def.value = s->size;
4507
4508 /* Increment the section size to make room for the symbol. */
4509 s->size += h->size;
4510
4511 return TRUE;
4512 }
4513
4514 /* Allocate space in .plt, .got and associated reloc sections for
4515 dynamic relocs. */
4516
4517 static bfd_boolean
4518 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
4519 {
4520 struct bfd_link_info *info;
4521 struct elf32_arm_link_hash_table *htab;
4522 struct elf32_arm_link_hash_entry *eh;
4523 struct elf32_arm_relocs_copied *p;
4524
4525 eh = (struct elf32_arm_link_hash_entry *) h;
4526
4527 if (h->root.type == bfd_link_hash_indirect)
4528 return TRUE;
4529
4530 if (h->root.type == bfd_link_hash_warning)
4531 /* When warning symbols are created, they **replace** the "real"
4532 entry in the hash table, thus we never get to see the real
4533 symbol in a hash traversal. So look at it now. */
4534 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4535
4536 info = (struct bfd_link_info *) inf;
4537 htab = elf32_arm_hash_table (info);
4538
4539 if (htab->root.dynamic_sections_created
4540 && h->plt.refcount > 0)
4541 {
4542 /* Make sure this symbol is output as a dynamic symbol.
4543 Undefined weak syms won't yet be marked as dynamic. */
4544 if (h->dynindx == -1
4545 && !h->forced_local)
4546 {
4547 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4548 return FALSE;
4549 }
4550
4551 if (info->shared
4552 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
4553 {
4554 asection *s = htab->splt;
4555
4556 /* If this is the first .plt entry, make room for the special
4557 first entry. */
4558 if (s->size == 0)
4559 s->size += htab->plt_header_size;
4560
4561 h->plt.offset = s->size;
4562
4563 /* If we will insert a Thumb trampoline before this PLT, leave room
4564 for it. */
4565 if (!htab->symbian_p && eh->plt_thumb_refcount > 0)
4566 {
4567 h->plt.offset += PLT_THUMB_STUB_SIZE;
4568 s->size += PLT_THUMB_STUB_SIZE;
4569 }
4570
4571 /* If this symbol is not defined in a regular file, and we are
4572 not generating a shared library, then set the symbol to this
4573 location in the .plt. This is required to make function
4574 pointers compare as equal between the normal executable and
4575 the shared library. */
4576 if (! info->shared
4577 && !h->def_regular)
4578 {
4579 h->root.u.def.section = s;
4580 h->root.u.def.value = h->plt.offset;
4581
4582 /* Make sure the function is not marked as Thumb, in case
4583 it is the target of an ABS32 relocation, which will
4584 point to the PLT entry. */
4585 if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC)
4586 h->type = ELF_ST_INFO (ELF_ST_BIND (h->type), STT_FUNC);
4587 }
4588
4589 /* Make room for this entry. */
4590 s->size += htab->plt_entry_size;
4591
4592 if (!htab->symbian_p)
4593 {
4594 /* We also need to make an entry in the .got.plt section, which
4595 will be placed in the .got section by the linker script. */
4596 eh->plt_got_offset = htab->sgotplt->size;
4597 htab->sgotplt->size += 4;
4598 }
4599
4600 /* We also need to make an entry in the .rel.plt section. */
4601 htab->srelplt->size += sizeof (Elf32_External_Rel);
4602 }
4603 else
4604 {
4605 h->plt.offset = (bfd_vma) -1;
4606 h->needs_plt = 0;
4607 }
4608 }
4609 else
4610 {
4611 h->plt.offset = (bfd_vma) -1;
4612 h->needs_plt = 0;
4613 }
4614
4615 if (h->got.refcount > 0)
4616 {
4617 asection *s;
4618 bfd_boolean dyn;
4619
4620 /* Make sure this symbol is output as a dynamic symbol.
4621 Undefined weak syms won't yet be marked as dynamic. */
4622 if (h->dynindx == -1
4623 && !h->forced_local)
4624 {
4625 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4626 return FALSE;
4627 }
4628
4629 if (!htab->symbian_p)
4630 {
4631 s = htab->sgot;
4632 h->got.offset = s->size;
4633 s->size += 4;
4634 dyn = htab->root.dynamic_sections_created;
4635 if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4636 || h->root.type != bfd_link_hash_undefweak)
4637 && (info->shared
4638 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
4639 htab->srelgot->size += sizeof (Elf32_External_Rel);
4640 }
4641 }
4642 else
4643 h->got.offset = (bfd_vma) -1;
4644
4645 if (eh->relocs_copied == NULL)
4646 return TRUE;
4647
4648 /* In the shared -Bsymbolic case, discard space allocated for
4649 dynamic pc-relative relocs against symbols which turn out to be
4650 defined in regular objects. For the normal shared case, discard
4651 space for pc-relative relocs that have become local due to symbol
4652 visibility changes. */
4653
4654 if (info->shared || htab->root.is_relocatable_executable)
4655 {
4656 /* Discard relocs on undefined weak syms with non-default
4657 visibility. */
4658 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4659 && h->root.type == bfd_link_hash_undefweak)
4660 eh->relocs_copied = NULL;
4661 else if (htab->root.is_relocatable_executable && h->dynindx == -1
4662 && h->root.type == bfd_link_hash_new)
4663 {
4664 /* Output absolute symbols so that we can create relocations
4665 against them. For normal symbols we output a relocation
4666 against the section that contains them. */
4667 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4668 return FALSE;
4669 }
4670
4671 }
4672 else
4673 {
4674 /* For the non-shared case, discard space for relocs against
4675 symbols which turn out to need copy relocs or are not
4676 dynamic. */
4677
4678 if (!h->non_got_ref
4679 && ((h->def_dynamic
4680 && !h->def_regular)
4681 || (htab->root.dynamic_sections_created
4682 && (h->root.type == bfd_link_hash_undefweak
4683 || h->root.type == bfd_link_hash_undefined))))
4684 {
4685 /* Make sure this symbol is output as a dynamic symbol.
4686 Undefined weak syms won't yet be marked as dynamic. */
4687 if (h->dynindx == -1
4688 && !h->forced_local)
4689 {
4690 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4691 return FALSE;
4692 }
4693
4694 /* If that succeeded, we know we'll be keeping all the
4695 relocs. */
4696 if (h->dynindx != -1)
4697 goto keep;
4698 }
4699
4700 eh->relocs_copied = NULL;
4701
4702 keep: ;
4703 }
4704
4705 /* Finally, allocate space. */
4706 for (p = eh->relocs_copied; p != NULL; p = p->next)
4707 {
4708 asection *sreloc = elf_section_data (p->section)->sreloc;
4709 sreloc->size += p->count * sizeof (Elf32_External_Rel);
4710 }
4711
4712 return TRUE;
4713 }
4714
4715 /* Find any dynamic relocs that apply to read-only sections. */
4716
4717 static bfd_boolean
4718 elf32_arm_readonly_dynrelocs (struct elf_link_hash_entry *h, PTR inf)
4719 {
4720 struct elf32_arm_link_hash_entry *eh;
4721 struct elf32_arm_relocs_copied *p;
4722
4723 if (h->root.type == bfd_link_hash_warning)
4724 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4725
4726 eh = (struct elf32_arm_link_hash_entry *) h;
4727 for (p = eh->relocs_copied; p != NULL; p = p->next)
4728 {
4729 asection *s = p->section;
4730
4731 if (s != NULL && (s->flags & SEC_READONLY) != 0)
4732 {
4733 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4734
4735 info->flags |= DF_TEXTREL;
4736
4737 /* Not an error, just cut short the traversal. */
4738 return FALSE;
4739 }
4740 }
4741 return TRUE;
4742 }
4743
4744 /* Set the sizes of the dynamic sections. */
4745
4746 static bfd_boolean
4747 elf32_arm_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
4748 struct bfd_link_info * info)
4749 {
4750 bfd * dynobj;
4751 asection * s;
4752 bfd_boolean plt;
4753 bfd_boolean relocs;
4754 bfd *ibfd;
4755 struct elf32_arm_link_hash_table *htab;
4756
4757 htab = elf32_arm_hash_table (info);
4758 dynobj = elf_hash_table (info)->dynobj;
4759 BFD_ASSERT (dynobj != NULL);
4760
4761 if (elf_hash_table (info)->dynamic_sections_created)
4762 {
4763 /* Set the contents of the .interp section to the interpreter. */
4764 if (info->executable)
4765 {
4766 s = bfd_get_section_by_name (dynobj, ".interp");
4767 BFD_ASSERT (s != NULL);
4768 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
4769 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
4770 }
4771 }
4772
4773 /* Set up .got offsets for local syms, and space for local dynamic
4774 relocs. */
4775 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
4776 {
4777 bfd_signed_vma *local_got;
4778 bfd_signed_vma *end_local_got;
4779 char *local_tls_type;
4780 bfd_size_type locsymcount;
4781 Elf_Internal_Shdr *symtab_hdr;
4782 asection *srel;
4783
4784 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
4785 continue;
4786
4787 for (s = ibfd->sections; s != NULL; s = s->next)
4788 {
4789 struct elf32_arm_relocs_copied *p;
4790
4791 for (p = *((struct elf32_arm_relocs_copied **)
4792 &elf_section_data (s)->local_dynrel);
4793 p != NULL;
4794 p = p->next)
4795 {
4796 if (!bfd_is_abs_section (p->section)
4797 && bfd_is_abs_section (p->section->output_section))
4798 {
4799 /* Input section has been discarded, either because
4800 it is a copy of a linkonce section or due to
4801 linker script /DISCARD/, so we'll be discarding
4802 the relocs too. */
4803 }
4804 else if (p->count != 0)
4805 {
4806 srel = elf_section_data (p->section)->sreloc;
4807 srel->size += p->count * sizeof (Elf32_External_Rel);
4808 if ((p->section->output_section->flags & SEC_READONLY) != 0)
4809 info->flags |= DF_TEXTREL;
4810 }
4811 }
4812 }
4813
4814 local_got = elf_local_got_refcounts (ibfd);
4815 if (!local_got)
4816 continue;
4817
4818 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
4819 locsymcount = symtab_hdr->sh_info;
4820 end_local_got = local_got + locsymcount;
4821 s = htab->sgot;
4822 srel = htab->srelgot;
4823 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
4824 {
4825 if (*local_got > 0)
4826 {
4827 *local_got = s->size;
4828 s->size += 4;
4829 if (info->shared)
4830 srel->size += sizeof (Elf32_External_Rel);
4831 }
4832 else
4833 *local_got = (bfd_vma) -1;
4834 }
4835 }
4836
4837 /* Allocate global sym .plt and .got entries, and space for global
4838 sym dynamic relocs. */
4839 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info);
4840
4841 /* The check_relocs and adjust_dynamic_symbol entry points have
4842 determined the sizes of the various dynamic sections. Allocate
4843 memory for them. */
4844 plt = FALSE;
4845 relocs = FALSE;
4846 for (s = dynobj->sections; s != NULL; s = s->next)
4847 {
4848 const char * name;
4849 bfd_boolean strip;
4850
4851 if ((s->flags & SEC_LINKER_CREATED) == 0)
4852 continue;
4853
4854 /* It's OK to base decisions on the section name, because none
4855 of the dynobj section names depend upon the input files. */
4856 name = bfd_get_section_name (dynobj, s);
4857
4858 strip = FALSE;
4859
4860 if (strcmp (name, ".plt") == 0)
4861 {
4862 if (s->size == 0)
4863 {
4864 /* Strip this section if we don't need it; see the
4865 comment below. */
4866 strip = TRUE;
4867 }
4868 else
4869 {
4870 /* Remember whether there is a PLT. */
4871 plt = TRUE;
4872 }
4873 }
4874 else if (strncmp (name, ".rel", 4) == 0)
4875 {
4876 if (s->size == 0)
4877 {
4878 /* If we don't need this section, strip it from the
4879 output file. This is mostly to handle .rel.bss and
4880 .rel.plt. We must create both sections in
4881 create_dynamic_sections, because they must be created
4882 before the linker maps input sections to output
4883 sections. The linker does that before
4884 adjust_dynamic_symbol is called, and it is that
4885 function which decides whether anything needs to go
4886 into these sections. */
4887 strip = TRUE;
4888 }
4889 else
4890 {
4891 /* Remember whether there are any reloc sections other
4892 than .rel.plt. */
4893 if (strcmp (name, ".rel.plt") != 0)
4894 relocs = TRUE;
4895
4896 /* We use the reloc_count field as a counter if we need
4897 to copy relocs into the output file. */
4898 s->reloc_count = 0;
4899 }
4900 }
4901 else if (strncmp (name, ".got", 4) != 0)
4902 {
4903 /* It's not one of our sections, so don't allocate space. */
4904 continue;
4905 }
4906
4907 if (strip)
4908 {
4909 _bfd_strip_section_from_output (info, s);
4910 continue;
4911 }
4912
4913 /* Allocate memory for the section contents. */
4914 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
4915 if (s->contents == NULL && s->size != 0)
4916 return FALSE;
4917 }
4918
4919 if (elf_hash_table (info)->dynamic_sections_created)
4920 {
4921 /* Add some entries to the .dynamic section. We fill in the
4922 values later, in elf32_arm_finish_dynamic_sections, but we
4923 must add the entries now so that we get the correct size for
4924 the .dynamic section. The DT_DEBUG entry is filled in by the
4925 dynamic linker and used by the debugger. */
4926 #define add_dynamic_entry(TAG, VAL) \
4927 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4928
4929 if (!info->shared)
4930 {
4931 if (!add_dynamic_entry (DT_DEBUG, 0))
4932 return FALSE;
4933 }
4934
4935 if (plt)
4936 {
4937 if ( !add_dynamic_entry (DT_PLTGOT, 0)
4938 || !add_dynamic_entry (DT_PLTRELSZ, 0)
4939 || !add_dynamic_entry (DT_PLTREL, DT_REL)
4940 || !add_dynamic_entry (DT_JMPREL, 0))
4941 return FALSE;
4942 }
4943
4944 if (relocs)
4945 {
4946 if ( !add_dynamic_entry (DT_REL, 0)
4947 || !add_dynamic_entry (DT_RELSZ, 0)
4948 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
4949 return FALSE;
4950 }
4951
4952 /* If any dynamic relocs apply to a read-only section,
4953 then we need a DT_TEXTREL entry. */
4954 if ((info->flags & DF_TEXTREL) == 0)
4955 elf_link_hash_traverse (&htab->root, elf32_arm_readonly_dynrelocs,
4956 (PTR) info);
4957
4958 if ((info->flags & DF_TEXTREL) != 0)
4959 {
4960 if (!add_dynamic_entry (DT_TEXTREL, 0))
4961 return FALSE;
4962 info->flags |= DF_TEXTREL;
4963 }
4964 }
4965 #undef add_synamic_entry
4966
4967 return TRUE;
4968 }
4969
4970 /* Finish up dynamic symbol handling. We set the contents of various
4971 dynamic sections here. */
4972
4973 static bfd_boolean
4974 elf32_arm_finish_dynamic_symbol (bfd * output_bfd, struct bfd_link_info * info,
4975 struct elf_link_hash_entry * h, Elf_Internal_Sym * sym)
4976 {
4977 bfd * dynobj;
4978 struct elf32_arm_link_hash_table *htab;
4979 struct elf32_arm_link_hash_entry *eh;
4980
4981 dynobj = elf_hash_table (info)->dynobj;
4982 htab = elf32_arm_hash_table (info);
4983 eh = (struct elf32_arm_link_hash_entry *) h;
4984
4985 if (h->plt.offset != (bfd_vma) -1)
4986 {
4987 asection * splt;
4988 asection * srel;
4989 bfd_byte *loc;
4990 bfd_vma plt_index;
4991 Elf_Internal_Rela rel;
4992
4993 /* This symbol has an entry in the procedure linkage table. Set
4994 it up. */
4995
4996 BFD_ASSERT (h->dynindx != -1);
4997
4998 splt = bfd_get_section_by_name (dynobj, ".plt");
4999 srel = bfd_get_section_by_name (dynobj, ".rel.plt");
5000 BFD_ASSERT (splt != NULL && srel != NULL);
5001
5002 /* Fill in the entry in the procedure linkage table. */
5003 if (htab->symbian_p)
5004 {
5005 unsigned i;
5006 for (i = 0; i < htab->plt_entry_size / 4; ++i)
5007 bfd_put_32 (output_bfd,
5008 elf32_arm_symbian_plt_entry[i],
5009 splt->contents + h->plt.offset + 4 * i);
5010
5011 /* Fill in the entry in the .rel.plt section. */
5012 rel.r_offset = (splt->output_section->vma
5013 + splt->output_offset
5014 + h->plt.offset + 4 * (i - 1));
5015 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
5016
5017 /* Get the index in the procedure linkage table which
5018 corresponds to this symbol. This is the index of this symbol
5019 in all the symbols for which we are making plt entries. The
5020 first entry in the procedure linkage table is reserved. */
5021 plt_index = ((h->plt.offset - htab->plt_header_size)
5022 / htab->plt_entry_size);
5023 }
5024 else
5025 {
5026 bfd_vma got_offset;
5027 bfd_vma got_displacement;
5028 asection * sgot;
5029
5030 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
5031 BFD_ASSERT (sgot != NULL);
5032
5033 /* Get the offset into the .got.plt table of the entry that
5034 corresponds to this function. */
5035 got_offset = eh->plt_got_offset;
5036
5037 /* Get the index in the procedure linkage table which
5038 corresponds to this symbol. This is the index of this symbol
5039 in all the symbols for which we are making plt entries. The
5040 first three entries in .got.plt are reserved; after that
5041 symbols appear in the same order as in .plt. */
5042 plt_index = (got_offset - 12) / 4;
5043
5044 /* Calculate the displacement between the PLT slot and the
5045 entry in the GOT. The eight-byte offset accounts for the
5046 value produced by adding to pc in the first instruction
5047 of the PLT stub. */
5048 got_displacement = (sgot->output_section->vma
5049 + sgot->output_offset
5050 + got_offset
5051 - splt->output_section->vma
5052 - splt->output_offset
5053 - h->plt.offset
5054 - 8);
5055
5056 BFD_ASSERT ((got_displacement & 0xf0000000) == 0);
5057
5058 if (eh->plt_thumb_refcount > 0)
5059 {
5060 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[0],
5061 splt->contents + h->plt.offset - 4);
5062 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[1],
5063 splt->contents + h->plt.offset - 2);
5064 }
5065
5066 bfd_put_32 (output_bfd, elf32_arm_plt_entry[0] | ((got_displacement & 0x0ff00000) >> 20),
5067 splt->contents + h->plt.offset + 0);
5068 bfd_put_32 (output_bfd, elf32_arm_plt_entry[1] | ((got_displacement & 0x000ff000) >> 12),
5069 splt->contents + h->plt.offset + 4);
5070 bfd_put_32 (output_bfd, elf32_arm_plt_entry[2] | (got_displacement & 0x00000fff),
5071 splt->contents + h->plt.offset + 8);
5072 #ifdef FOUR_WORD_PLT
5073 bfd_put_32 (output_bfd, elf32_arm_plt_entry[3],
5074 splt->contents + h->plt.offset + 12);
5075 #endif
5076
5077 /* Fill in the entry in the global offset table. */
5078 bfd_put_32 (output_bfd,
5079 (splt->output_section->vma
5080 + splt->output_offset),
5081 sgot->contents + got_offset);
5082
5083 /* Fill in the entry in the .rel.plt section. */
5084 rel.r_offset = (sgot->output_section->vma
5085 + sgot->output_offset
5086 + got_offset);
5087 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT);
5088 }
5089
5090 loc = srel->contents + plt_index * sizeof (Elf32_External_Rel);
5091 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5092
5093 if (!h->def_regular)
5094 {
5095 /* Mark the symbol as undefined, rather than as defined in
5096 the .plt section. Leave the value alone. */
5097 sym->st_shndx = SHN_UNDEF;
5098 /* If the symbol is weak, we do need to clear the value.
5099 Otherwise, the PLT entry would provide a definition for
5100 the symbol even if the symbol wasn't defined anywhere,
5101 and so the symbol would never be NULL. */
5102 if (!h->ref_regular_nonweak)
5103 sym->st_value = 0;
5104 }
5105 }
5106
5107 if (h->got.offset != (bfd_vma) -1)
5108 {
5109 asection * sgot;
5110 asection * srel;
5111 Elf_Internal_Rela rel;
5112 bfd_byte *loc;
5113
5114 /* This symbol has an entry in the global offset table. Set it
5115 up. */
5116 sgot = bfd_get_section_by_name (dynobj, ".got");
5117 srel = bfd_get_section_by_name (dynobj, ".rel.got");
5118 BFD_ASSERT (sgot != NULL && srel != NULL);
5119
5120 rel.r_offset = (sgot->output_section->vma
5121 + sgot->output_offset
5122 + (h->got.offset &~ (bfd_vma) 1));
5123
5124 /* If this is a static link, or it is a -Bsymbolic link and the
5125 symbol is defined locally or was forced to be local because
5126 of a version file, we just want to emit a RELATIVE reloc.
5127 The entry in the global offset table will already have been
5128 initialized in the relocate_section function. */
5129 if (info->shared
5130 && SYMBOL_REFERENCES_LOCAL (info, h))
5131 {
5132 BFD_ASSERT((h->got.offset & 1) != 0);
5133 rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
5134 }
5135 else
5136 {
5137 BFD_ASSERT((h->got.offset & 1) == 0);
5138 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
5139 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
5140 }
5141
5142 loc = srel->contents + srel->reloc_count++ * sizeof (Elf32_External_Rel);
5143 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5144 }
5145
5146 if (h->needs_copy)
5147 {
5148 asection * s;
5149 Elf_Internal_Rela rel;
5150 bfd_byte *loc;
5151
5152 /* This symbol needs a copy reloc. Set it up. */
5153 BFD_ASSERT (h->dynindx != -1
5154 && (h->root.type == bfd_link_hash_defined
5155 || h->root.type == bfd_link_hash_defweak));
5156
5157 s = bfd_get_section_by_name (h->root.u.def.section->owner,
5158 ".rel.bss");
5159 BFD_ASSERT (s != NULL);
5160
5161 rel.r_offset = (h->root.u.def.value
5162 + h->root.u.def.section->output_section->vma
5163 + h->root.u.def.section->output_offset);
5164 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY);
5165 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rel);
5166 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5167 }
5168
5169 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
5170 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
5171 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
5172 sym->st_shndx = SHN_ABS;
5173
5174 return TRUE;
5175 }
5176
5177 /* Finish up the dynamic sections. */
5178
5179 static bfd_boolean
5180 elf32_arm_finish_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info)
5181 {
5182 bfd * dynobj;
5183 asection * sgot;
5184 asection * sdyn;
5185
5186 dynobj = elf_hash_table (info)->dynobj;
5187
5188 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
5189 BFD_ASSERT (elf32_arm_hash_table (info)->symbian_p || sgot != NULL);
5190 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
5191
5192 if (elf_hash_table (info)->dynamic_sections_created)
5193 {
5194 asection *splt;
5195 Elf32_External_Dyn *dyncon, *dynconend;
5196 struct elf32_arm_link_hash_table *htab;
5197
5198 htab = elf32_arm_hash_table (info);
5199 splt = bfd_get_section_by_name (dynobj, ".plt");
5200 BFD_ASSERT (splt != NULL && sdyn != NULL);
5201
5202 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5203 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5204
5205 for (; dyncon < dynconend; dyncon++)
5206 {
5207 Elf_Internal_Dyn dyn;
5208 const char * name;
5209 asection * s;
5210
5211 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5212
5213 switch (dyn.d_tag)
5214 {
5215 unsigned int type;
5216
5217 default:
5218 break;
5219
5220 case DT_HASH:
5221 name = ".hash";
5222 goto get_vma_if_bpabi;
5223 case DT_STRTAB:
5224 name = ".dynstr";
5225 goto get_vma_if_bpabi;
5226 case DT_SYMTAB:
5227 name = ".dynsym";
5228 goto get_vma_if_bpabi;
5229 case DT_VERSYM:
5230 name = ".gnu.version";
5231 goto get_vma_if_bpabi;
5232 case DT_VERDEF:
5233 name = ".gnu.version_d";
5234 goto get_vma_if_bpabi;
5235 case DT_VERNEED:
5236 name = ".gnu.version_r";
5237 goto get_vma_if_bpabi;
5238
5239 case DT_PLTGOT:
5240 name = ".got";
5241 goto get_vma;
5242 case DT_JMPREL:
5243 name = ".rel.plt";
5244 get_vma:
5245 s = bfd_get_section_by_name (output_bfd, name);
5246 BFD_ASSERT (s != NULL);
5247 if (!htab->symbian_p)
5248 dyn.d_un.d_ptr = s->vma;
5249 else
5250 /* In the BPABI, tags in the PT_DYNAMIC section point
5251 at the file offset, not the memory address, for the
5252 convenience of the post linker. */
5253 dyn.d_un.d_ptr = s->filepos;
5254 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5255 break;
5256
5257 get_vma_if_bpabi:
5258 if (htab->symbian_p)
5259 goto get_vma;
5260 break;
5261
5262 case DT_PLTRELSZ:
5263 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5264 BFD_ASSERT (s != NULL);
5265 dyn.d_un.d_val = s->size;
5266 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5267 break;
5268
5269 case DT_RELSZ:
5270 if (!htab->symbian_p)
5271 {
5272 /* My reading of the SVR4 ABI indicates that the
5273 procedure linkage table relocs (DT_JMPREL) should be
5274 included in the overall relocs (DT_REL). This is
5275 what Solaris does. However, UnixWare can not handle
5276 that case. Therefore, we override the DT_RELSZ entry
5277 here to make it not include the JMPREL relocs. Since
5278 the linker script arranges for .rel.plt to follow all
5279 other relocation sections, we don't have to worry
5280 about changing the DT_REL entry. */
5281 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5282 if (s != NULL)
5283 dyn.d_un.d_val -= s->size;
5284 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5285 break;
5286 }
5287 /* Fall through */
5288
5289 case DT_REL:
5290 case DT_RELA:
5291 case DT_RELASZ:
5292 /* In the BPABI, the DT_REL tag must point at the file
5293 offset, not the VMA, of the first relocation
5294 section. So, we use code similar to that in
5295 elflink.c, but do not check for SHF_ALLOC on the
5296 relcoation section, since relocations sections are
5297 never allocated under the BPABI. The comments above
5298 about Unixware notwithstanding, we include all of the
5299 relocations here. */
5300 if (htab->symbian_p)
5301 {
5302 unsigned int i;
5303 type = ((dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5304 ? SHT_REL : SHT_RELA);
5305 dyn.d_un.d_val = 0;
5306 for (i = 1; i < elf_numsections (output_bfd); i++)
5307 {
5308 Elf_Internal_Shdr *hdr
5309 = elf_elfsections (output_bfd)[i];
5310 if (hdr->sh_type == type)
5311 {
5312 if (dyn.d_tag == DT_RELSZ
5313 || dyn.d_tag == DT_RELASZ)
5314 dyn.d_un.d_val += hdr->sh_size;
5315 else if ((ufile_ptr) hdr->sh_offset
5316 <= dyn.d_un.d_val - 1)
5317 dyn.d_un.d_val = hdr->sh_offset;
5318 }
5319 }
5320 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5321 }
5322 break;
5323
5324 /* Set the bottom bit of DT_INIT/FINI if the
5325 corresponding function is Thumb. */
5326 case DT_INIT:
5327 name = info->init_function;
5328 goto get_sym;
5329 case DT_FINI:
5330 name = info->fini_function;
5331 get_sym:
5332 /* If it wasn't set by elf_bfd_final_link
5333 then there is nothing to adjust. */
5334 if (dyn.d_un.d_val != 0)
5335 {
5336 struct elf_link_hash_entry * eh;
5337
5338 eh = elf_link_hash_lookup (elf_hash_table (info), name,
5339 FALSE, FALSE, TRUE);
5340 if (eh != (struct elf_link_hash_entry *) NULL
5341 && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC)
5342 {
5343 dyn.d_un.d_val |= 1;
5344 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5345 }
5346 }
5347 break;
5348 }
5349 }
5350
5351 /* Fill in the first entry in the procedure linkage table. */
5352 if (splt->size > 0 && elf32_arm_hash_table (info)->plt_header_size)
5353 {
5354 bfd_vma got_displacement;
5355
5356 /* Calculate the displacement between the PLT slot and &GOT[0]. */
5357 got_displacement = (sgot->output_section->vma
5358 + sgot->output_offset
5359 - splt->output_section->vma
5360 - splt->output_offset
5361 - 16);
5362
5363 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[0], splt->contents + 0);
5364 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[1], splt->contents + 4);
5365 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[2], splt->contents + 8);
5366 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[3], splt->contents + 12);
5367 #ifdef FOUR_WORD_PLT
5368 /* The displacement value goes in the otherwise-unused last word of
5369 the second entry. */
5370 bfd_put_32 (output_bfd, got_displacement, splt->contents + 28);
5371 #else
5372 bfd_put_32 (output_bfd, got_displacement, splt->contents + 16);
5373 #endif
5374 }
5375
5376 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5377 really seem like the right value. */
5378 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
5379 }
5380
5381 /* Fill in the first three entries in the global offset table. */
5382 if (sgot)
5383 {
5384 if (sgot->size > 0)
5385 {
5386 if (sdyn == NULL)
5387 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
5388 else
5389 bfd_put_32 (output_bfd,
5390 sdyn->output_section->vma + sdyn->output_offset,
5391 sgot->contents);
5392 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
5393 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
5394 }
5395
5396 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
5397 }
5398
5399 return TRUE;
5400 }
5401
5402 static void
5403 elf32_arm_post_process_headers (bfd * abfd, struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
5404 {
5405 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
5406 struct elf32_arm_link_hash_table *globals;
5407
5408 i_ehdrp = elf_elfheader (abfd);
5409
5410 if (EF_ARM_EABI_VERSION (i_ehdrp->e_flags) == EF_ARM_EABI_UNKNOWN)
5411 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_ARM;
5412 else
5413 i_ehdrp->e_ident[EI_OSABI] = 0;
5414 i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION;
5415
5416 if (link_info)
5417 {
5418 globals = elf32_arm_hash_table (link_info);
5419 if (globals->byteswap_code)
5420 i_ehdrp->e_flags |= EF_ARM_BE8;
5421 }
5422 }
5423
5424 static enum elf_reloc_type_class
5425 elf32_arm_reloc_type_class (const Elf_Internal_Rela *rela)
5426 {
5427 switch ((int) ELF32_R_TYPE (rela->r_info))
5428 {
5429 case R_ARM_RELATIVE:
5430 return reloc_class_relative;
5431 case R_ARM_JUMP_SLOT:
5432 return reloc_class_plt;
5433 case R_ARM_COPY:
5434 return reloc_class_copy;
5435 default:
5436 return reloc_class_normal;
5437 }
5438 }
5439
5440 /* Set the right machine number for an Arm ELF file. */
5441
5442 static bfd_boolean
5443 elf32_arm_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr)
5444 {
5445 if (hdr->sh_type == SHT_NOTE)
5446 *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS;
5447
5448 return TRUE;
5449 }
5450
5451 static void
5452 elf32_arm_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED)
5453 {
5454 bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
5455 }
5456
5457 /* Return TRUE if this is an unwinding table entry. */
5458
5459 static bfd_boolean
5460 is_arm_elf_unwind_section_name (bfd * abfd ATTRIBUTE_UNUSED, const char * name)
5461 {
5462 size_t len1, len2;
5463
5464 len1 = sizeof (ELF_STRING_ARM_unwind) - 1;
5465 len2 = sizeof (ELF_STRING_ARM_unwind_once) - 1;
5466 return (strncmp (name, ELF_STRING_ARM_unwind, len1) == 0
5467 || strncmp (name, ELF_STRING_ARM_unwind_once, len2) == 0);
5468 }
5469
5470
5471 /* Set the type and flags for an ARM section. We do this by
5472 the section name, which is a hack, but ought to work. */
5473
5474 static bfd_boolean
5475 elf32_arm_fake_sections (bfd * abfd, Elf_Internal_Shdr * hdr, asection * sec)
5476 {
5477 const char * name;
5478
5479 name = bfd_get_section_name (abfd, sec);
5480
5481 if (is_arm_elf_unwind_section_name (abfd, name))
5482 {
5483 hdr->sh_type = SHT_ARM_EXIDX;
5484 hdr->sh_flags |= SHF_LINK_ORDER;
5485 }
5486 return TRUE;
5487 }
5488
5489 /* Handle an ARM specific section when reading an object file.
5490 This is called when elf.c finds a section with an unknown type. */
5491
5492 static bfd_boolean
5493 elf32_arm_section_from_shdr (bfd *abfd,
5494 Elf_Internal_Shdr * hdr,
5495 const char *name)
5496 {
5497 /* There ought to be a place to keep ELF backend specific flags, but
5498 at the moment there isn't one. We just keep track of the
5499 sections by their name, instead. Fortunately, the ABI gives
5500 names for all the ARM specific sections, so we will probably get
5501 away with this. */
5502 switch (hdr->sh_type)
5503 {
5504 case SHT_ARM_EXIDX:
5505 break;
5506
5507 default:
5508 return FALSE;
5509 }
5510
5511 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
5512 return FALSE;
5513
5514 return TRUE;
5515 }
5516
5517 /* Called for each symbol. Builds a section map based on mapping symbols.
5518 Does not alter any of the symbols. */
5519
5520 static bfd_boolean
5521 elf32_arm_output_symbol_hook (struct bfd_link_info *info,
5522 const char *name,
5523 Elf_Internal_Sym *elfsym,
5524 asection *input_sec,
5525 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
5526 {
5527 int mapcount;
5528 elf32_arm_section_map *map;
5529 struct elf32_arm_link_hash_table *globals;
5530
5531 /* Only do this on final link. */
5532 if (info->relocatable)
5533 return TRUE;
5534
5535 /* Only build a map if we need to byteswap code. */
5536 globals = elf32_arm_hash_table (info);
5537 if (!globals->byteswap_code)
5538 return TRUE;
5539
5540 /* We only want mapping symbols. */
5541 if (! is_arm_mapping_symbol_name (name))
5542 return TRUE;
5543
5544 mapcount = ++(elf32_arm_section_data (input_sec)->mapcount);
5545 map = elf32_arm_section_data (input_sec)->map;
5546 /* TODO: This may be inefficient, but we probably don't usually have many
5547 mapping symbols per section. */
5548 map = bfd_realloc (map, mapcount * sizeof (elf32_arm_section_map));
5549 elf32_arm_section_data (input_sec)->map = map;
5550
5551 map[mapcount - 1].vma = elfsym->st_value;
5552 map[mapcount - 1].type = name[1];
5553 return TRUE;
5554 }
5555
5556
5557 /* Allocate target specific section data. */
5558
5559 static bfd_boolean
5560 elf32_arm_new_section_hook (bfd *abfd, asection *sec)
5561 {
5562 struct _arm_elf_section_data *sdata;
5563 bfd_size_type amt = sizeof (*sdata);
5564
5565 sdata = bfd_zalloc (abfd, amt);
5566 if (sdata == NULL)
5567 return FALSE;
5568 sec->used_by_bfd = sdata;
5569
5570 return _bfd_elf_new_section_hook (abfd, sec);
5571 }
5572
5573
5574 /* Used to order a list of mapping symbols by address. */
5575
5576 static int
5577 elf32_arm_compare_mapping (const void * a, const void * b)
5578 {
5579 return ((const elf32_arm_section_map *) a)->vma
5580 > ((const elf32_arm_section_map *) b)->vma;
5581 }
5582
5583
5584 /* Do code byteswapping. Return FALSE afterwards so that the section is
5585 written out as normal. */
5586
5587 static bfd_boolean
5588 elf32_arm_write_section (bfd *output_bfd ATTRIBUTE_UNUSED, asection *sec,
5589 bfd_byte *contents)
5590 {
5591 int mapcount;
5592 elf32_arm_section_map *map;
5593 bfd_vma ptr;
5594 bfd_vma end;
5595 bfd_vma offset;
5596 bfd_byte tmp;
5597 int i;
5598
5599 mapcount = elf32_arm_section_data (sec)->mapcount;
5600 map = elf32_arm_section_data (sec)->map;
5601
5602 if (mapcount == 0)
5603 return FALSE;
5604
5605 qsort (map, mapcount, sizeof (elf32_arm_section_map),
5606 elf32_arm_compare_mapping);
5607
5608 offset = sec->output_section->vma + sec->output_offset;
5609 ptr = map[0].vma - offset;
5610 for (i = 0; i < mapcount; i++)
5611 {
5612 if (i == mapcount - 1)
5613 end = sec->size;
5614 else
5615 end = map[i + 1].vma - offset;
5616
5617 switch (map[i].type)
5618 {
5619 case 'a':
5620 /* Byte swap code words. */
5621 while (ptr + 3 < end)
5622 {
5623 tmp = contents[ptr];
5624 contents[ptr] = contents[ptr + 3];
5625 contents[ptr + 3] = tmp;
5626 tmp = contents[ptr + 1];
5627 contents[ptr + 1] = contents[ptr + 2];
5628 contents[ptr + 2] = tmp;
5629 ptr += 4;
5630 }
5631 break;
5632
5633 case 't':
5634 /* Byte swap code halfwords. */
5635 while (ptr + 1 < end)
5636 {
5637 tmp = contents[ptr];
5638 contents[ptr] = contents[ptr + 1];
5639 contents[ptr + 1] = tmp;
5640 ptr += 2;
5641 }
5642 break;
5643
5644 case 'd':
5645 /* Leave data alone. */
5646 break;
5647 }
5648 ptr = end;
5649 }
5650 free (map);
5651 return FALSE;
5652 }
5653
5654 /* Display STT_ARM_TFUNC symbols as functions. */
5655
5656 static void
5657 elf32_arm_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5658 asymbol *asym)
5659 {
5660 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5661
5662 if (ELF_ST_TYPE (elfsym->internal_elf_sym.st_info) == STT_ARM_TFUNC)
5663 elfsym->symbol.flags |= BSF_FUNCTION;
5664 }
5665
5666
5667 /* Mangle thumb function symbols as we read them in. */
5668
5669 static void
5670 elf32_arm_swap_symbol_in (bfd * abfd,
5671 const void *psrc,
5672 const void *pshn,
5673 Elf_Internal_Sym *dst)
5674 {
5675 bfd_elf32_swap_symbol_in (abfd, psrc, pshn, dst);
5676
5677 /* New EABI objects mark thumb function symbols by setting the low bit of
5678 the address. Turn these into STT_ARM_TFUNC. */
5679 if (ELF_ST_TYPE (dst->st_info) == STT_FUNC
5680 && (dst->st_value & 1))
5681 {
5682 dst->st_info = ELF_ST_INFO (ELF_ST_BIND (dst->st_info), STT_ARM_TFUNC);
5683 dst->st_value &= ~(bfd_vma) 1;
5684 }
5685 }
5686
5687
5688 /* Mangle thumb function symbols as we write them out. */
5689
5690 static void
5691 elf32_arm_swap_symbol_out (bfd *abfd,
5692 const Elf_Internal_Sym *src,
5693 void *cdst,
5694 void *shndx)
5695 {
5696 Elf_Internal_Sym newsym;
5697
5698 /* We convert STT_ARM_TFUNC symbols into STT_FUNC with the low bit
5699 of the address set, as per the new EABI. We do this unconditionally
5700 because objcopy does not set the elf header flags until after
5701 it writes out the symbol table. */
5702 if (ELF_ST_TYPE (src->st_info) == STT_ARM_TFUNC)
5703 {
5704 newsym = *src;
5705 newsym.st_info = ELF_ST_INFO (ELF_ST_BIND (src->st_info), STT_FUNC);
5706 newsym.st_value |= 1;
5707
5708 src = &newsym;
5709 }
5710 bfd_elf32_swap_symbol_out (abfd, src, cdst, shndx);
5711 }
5712
5713 /* We use this to override swap_symbol_in and swap_symbol_out. */
5714 const struct elf_size_info elf32_arm_size_info = {
5715 sizeof (Elf32_External_Ehdr),
5716 sizeof (Elf32_External_Phdr),
5717 sizeof (Elf32_External_Shdr),
5718 sizeof (Elf32_External_Rel),
5719 sizeof (Elf32_External_Rela),
5720 sizeof (Elf32_External_Sym),
5721 sizeof (Elf32_External_Dyn),
5722 sizeof (Elf_External_Note),
5723 4,
5724 1,
5725 32, 2,
5726 ELFCLASS32, EV_CURRENT,
5727 bfd_elf32_write_out_phdrs,
5728 bfd_elf32_write_shdrs_and_ehdr,
5729 bfd_elf32_write_relocs,
5730 elf32_arm_swap_symbol_in,
5731 elf32_arm_swap_symbol_out,
5732 bfd_elf32_slurp_reloc_table,
5733 bfd_elf32_slurp_symbol_table,
5734 bfd_elf32_swap_dyn_in,
5735 bfd_elf32_swap_dyn_out,
5736 bfd_elf32_swap_reloc_in,
5737 bfd_elf32_swap_reloc_out,
5738 bfd_elf32_swap_reloca_in,
5739 bfd_elf32_swap_reloca_out
5740 };
5741
5742 #define ELF_ARCH bfd_arch_arm
5743 #define ELF_MACHINE_CODE EM_ARM
5744 #ifdef __QNXTARGET__
5745 #define ELF_MAXPAGESIZE 0x1000
5746 #else
5747 #define ELF_MAXPAGESIZE 0x8000
5748 #endif
5749 #define ELF_MINPAGESIZE 0x1000
5750
5751 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
5752 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
5753 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
5754 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
5755 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
5756 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
5757 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
5758 #define bfd_elf32_new_section_hook elf32_arm_new_section_hook
5759 #define bfd_elf32_bfd_is_target_special_symbol elf32_arm_is_target_special_symbol
5760
5761 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type
5762 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
5763 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
5764 #define elf_backend_check_relocs elf32_arm_check_relocs
5765 #define elf_backend_relocate_section elf32_arm_relocate_section
5766 #define elf_backend_write_section elf32_arm_write_section
5767 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
5768 #define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections
5769 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
5770 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
5771 #define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook
5772 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
5773 #define elf_backend_post_process_headers elf32_arm_post_process_headers
5774 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class
5775 #define elf_backend_object_p elf32_arm_object_p
5776 #define elf_backend_section_flags elf32_arm_section_flags
5777 #define elf_backend_fake_sections elf32_arm_fake_sections
5778 #define elf_backend_section_from_shdr elf32_arm_section_from_shdr
5779 #define elf_backend_final_write_processing elf32_arm_final_write_processing
5780 #define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol
5781 #define elf_backend_symbol_processing elf32_arm_symbol_processing
5782 #define elf_backend_size_info elf32_arm_size_info
5783
5784 #define elf_backend_can_refcount 1
5785 #define elf_backend_can_gc_sections 1
5786 #define elf_backend_plt_readonly 1
5787 #define elf_backend_want_got_plt 1
5788 #define elf_backend_want_plt_sym 0
5789 #define elf_backend_may_use_rel_p 1
5790 #define elf_backend_may_use_rela_p 0
5791 #define elf_backend_default_use_rela_p 0
5792 #define elf_backend_rela_normal 0
5793
5794 #define elf_backend_got_header_size 12
5795
5796 #include "elf32-target.h"
5797
5798 /* VxWorks Targets */
5799
5800 #undef TARGET_LITTLE_SYM
5801 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_vxworks_vec
5802 #undef TARGET_LITTLE_NAME
5803 #define TARGET_LITTLE_NAME "elf32-littlearm-vxworks"
5804 #undef TARGET_BIG_SYM
5805 #define TARGET_BIG_SYM bfd_elf32_bigarm_vxworks_vec
5806 #undef TARGET_BIG_NAME
5807 #define TARGET_BIG_NAME "elf32-bigarm-vxworks"
5808
5809 /* Like elf32_arm_link_hash_table_create -- but overrides
5810 appropriately for VxWorks. */
5811 static struct bfd_link_hash_table *
5812 elf32_arm_vxworks_link_hash_table_create (bfd *abfd)
5813 {
5814 struct bfd_link_hash_table *ret;
5815
5816 ret = elf32_arm_link_hash_table_create (abfd);
5817 if (ret)
5818 {
5819 struct elf32_arm_link_hash_table *htab
5820 = (struct elf32_arm_link_hash_table *)ret;
5821 htab->use_rel = 0;
5822 }
5823 return ret;
5824 }
5825
5826 #undef elf32_bed
5827 #define elf32_bed elf32_arm_vxworks_bed
5828
5829 #undef bfd_elf32_bfd_link_hash_table_create
5830 #define bfd_elf32_bfd_link_hash_table_create \
5831 elf32_arm_vxworks_link_hash_table_create
5832
5833 #undef elf_backend_may_use_rel_p
5834 #define elf_backend_may_use_rel_p 0
5835 #undef elf_backend_may_use_rela_p
5836 #define elf_backend_may_use_rela_p 1
5837 #undef elf_backend_default_use_rela_p
5838 #define elf_backend_default_use_rela_p 1
5839 #undef elf_backend_rela_normal
5840 #define elf_backend_rela_normal 1
5841
5842 #include "elf32-target.h"
5843
5844
5845 /* Symbian OS Targets */
5846
5847 #undef TARGET_LITTLE_SYM
5848 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_symbian_vec
5849 #undef TARGET_LITTLE_NAME
5850 #define TARGET_LITTLE_NAME "elf32-littlearm-symbian"
5851 #undef TARGET_BIG_SYM
5852 #define TARGET_BIG_SYM bfd_elf32_bigarm_symbian_vec
5853 #undef TARGET_BIG_NAME
5854 #define TARGET_BIG_NAME "elf32-bigarm-symbian"
5855
5856 /* Like elf32_arm_link_hash_table_create -- but overrides
5857 appropriately for Symbian OS. */
5858 static struct bfd_link_hash_table *
5859 elf32_arm_symbian_link_hash_table_create (bfd *abfd)
5860 {
5861 struct bfd_link_hash_table *ret;
5862
5863 ret = elf32_arm_link_hash_table_create (abfd);
5864 if (ret)
5865 {
5866 struct elf32_arm_link_hash_table *htab
5867 = (struct elf32_arm_link_hash_table *)ret;
5868 /* There is no PLT header for Symbian OS. */
5869 htab->plt_header_size = 0;
5870 /* The PLT entries are each three instructions. */
5871 htab->plt_entry_size = 4 * NUM_ELEM (elf32_arm_symbian_plt_entry);
5872 htab->symbian_p = 1;
5873 htab->root.is_relocatable_executable = 1;
5874 }
5875 return ret;
5876 }
5877
5878 static struct bfd_elf_special_section const
5879 elf32_arm_symbian_special_sections[]=
5880 {
5881 /* In a BPABI executable, the dynamic linking sections do not go in
5882 the loadable read-only segment. The post-linker may wish to
5883 refer to these sections, but they are not part of the final
5884 program image. */
5885 { ".dynamic", 8, 0, SHT_DYNAMIC, 0 },
5886 { ".dynstr", 7, 0, SHT_STRTAB, 0 },
5887 { ".dynsym", 7, 0, SHT_DYNSYM, 0 },
5888 { ".got", 4, 0, SHT_PROGBITS, 0 },
5889 { ".hash", 5, 0, SHT_HASH, 0 },
5890 /* These sections do not need to be writable as the SymbianOS
5891 postlinker will arrange things so that no dynamic relocation is
5892 required. */
5893 { ".init_array", 11, 0, SHT_INIT_ARRAY, SHF_ALLOC },
5894 { ".fini_array", 11, 0, SHT_FINI_ARRAY, SHF_ALLOC },
5895 { ".preinit_array", 14, 0, SHT_PREINIT_ARRAY, SHF_ALLOC },
5896 { NULL, 0, 0, 0, 0 }
5897 };
5898
5899 static void
5900 elf32_arm_symbian_begin_write_processing (bfd *abfd,
5901 struct bfd_link_info *link_info
5902 ATTRIBUTE_UNUSED)
5903 {
5904 /* BPABI objects are never loaded directly by an OS kernel; they are
5905 processed by a postlinker first, into an OS-specific format. If
5906 the D_PAGED bit is set on the file, BFD will align segments on
5907 page boundaries, so that an OS can directly map the file. With
5908 BPABI objects, that just results in wasted space. In addition,
5909 because we clear the D_PAGED bit, map_sections_to_segments will
5910 recognize that the program headers should not be mapped into any
5911 loadable segment. */
5912 abfd->flags &= ~D_PAGED;
5913 }
5914
5915 static bfd_boolean
5916 elf32_arm_symbian_modify_segment_map (bfd *abfd,
5917 struct bfd_link_info *info
5918 ATTRIBUTE_UNUSED)
5919 {
5920 struct elf_segment_map *m;
5921 asection *dynsec;
5922
5923 /* BPABI shared libraries and executables should have a PT_DYNAMIC
5924 segment. However, because the .dynamic section is not marked
5925 with SEC_LOAD, the generic ELF code will not create such a
5926 segment. */
5927 dynsec = bfd_get_section_by_name (abfd, ".dynamic");
5928 if (dynsec)
5929 {
5930 m = _bfd_elf_make_dynamic_segment (abfd, dynsec);
5931 m->next = elf_tdata (abfd)->segment_map;
5932 elf_tdata (abfd)->segment_map = m;
5933 }
5934
5935 return TRUE;
5936 }
5937
5938 #undef elf32_bed
5939 #define elf32_bed elf32_arm_symbian_bed
5940
5941 /* The dynamic sections are not allocated on SymbianOS; the postlinker
5942 will process them and then discard them. */
5943 #undef ELF_DYNAMIC_SEC_FLAGS
5944 #define ELF_DYNAMIC_SEC_FLAGS \
5945 (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED)
5946
5947 #undef bfd_elf32_bfd_link_hash_table_create
5948 #define bfd_elf32_bfd_link_hash_table_create \
5949 elf32_arm_symbian_link_hash_table_create
5950
5951 #undef elf_backend_special_sections
5952 #define elf_backend_special_sections elf32_arm_symbian_special_sections
5953
5954 #undef elf_backend_begin_write_processing
5955 #define elf_backend_begin_write_processing \
5956 elf32_arm_symbian_begin_write_processing
5957
5958 #undef elf_backend_modify_segment_map
5959 #define elf_backend_modify_segment_map elf32_arm_symbian_modify_segment_map
5960
5961 /* There is no .got section for BPABI objects, and hence no header. */
5962 #undef elf_backend_got_header_size
5963 #define elf_backend_got_header_size 0
5964
5965 /* Similarly, there is no .got.plt section. */
5966 #undef elf_backend_want_got_plt
5967 #define elf_backend_want_got_plt 0
5968
5969 #undef elf_backend_may_use_rel_p
5970 #define elf_backend_may_use_rel_p 1
5971 #undef elf_backend_may_use_rela_p
5972 #define elf_backend_may_use_rela_p 0
5973 #undef elf_backend_default_use_rela_p
5974 #define elf_backend_default_use_rela_p 0
5975 #undef elf_backend_rela_normal
5976 #define elf_backend_rela_normal 0
5977
5978 #include "elf32-target.h"
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