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2005-02-10 Paul Brook <paul@codesourcery.com>
[thirdparty/binutils-gdb.git] / bfd / elf32-arm.c
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, these relocations are copied
2354 into the output file to be resolved at run time. */
2355 if (info->shared
2356 && (input_section->flags & SEC_ALLOC)
2357 && (r_type != R_ARM_REL32
2358 || !SYMBOL_CALLS_LOCAL (info, h))
2359 && (h == NULL
2360 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2361 || h->root.type != bfd_link_hash_undefweak)
2362 && r_type != R_ARM_PC24
2363 #ifndef OLD_ARM_ABI
2364 && r_type != R_ARM_CALL
2365 && r_type != R_ARM_JUMP24
2366 && r_type != R_ARM_PREL31
2367 #endif
2368 && r_type != R_ARM_PLT32)
2369 {
2370 Elf_Internal_Rela outrel;
2371 bfd_byte *loc;
2372 bfd_boolean skip, relocate;
2373
2374 if (sreloc == NULL)
2375 {
2376 const char * name;
2377
2378 name = (bfd_elf_string_from_elf_section
2379 (input_bfd,
2380 elf_elfheader (input_bfd)->e_shstrndx,
2381 elf_section_data (input_section)->rel_hdr.sh_name));
2382 if (name == NULL)
2383 return bfd_reloc_notsupported;
2384
2385 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
2386 && strcmp (bfd_get_section_name (input_bfd,
2387 input_section),
2388 name + 4) == 0);
2389
2390 sreloc = bfd_get_section_by_name (dynobj, name);
2391 BFD_ASSERT (sreloc != NULL);
2392 }
2393
2394 skip = FALSE;
2395 relocate = FALSE;
2396
2397 outrel.r_offset =
2398 _bfd_elf_section_offset (output_bfd, info, input_section,
2399 rel->r_offset);
2400 if (outrel.r_offset == (bfd_vma) -1)
2401 skip = TRUE;
2402 else if (outrel.r_offset == (bfd_vma) -2)
2403 skip = TRUE, relocate = TRUE;
2404 outrel.r_offset += (input_section->output_section->vma
2405 + input_section->output_offset);
2406
2407 if (skip)
2408 memset (&outrel, 0, sizeof outrel);
2409 else if (h != NULL
2410 && h->dynindx != -1
2411 && (!info->shared
2412 || !info->symbolic
2413 || !h->def_regular))
2414 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2415 else
2416 {
2417 int symbol;
2418
2419 /* This symbol is local, or marked to become local. */
2420 relocate = TRUE;
2421 if (sym_flags == STT_ARM_TFUNC)
2422 value |= 1;
2423 if (globals->symbian_p)
2424 {
2425 /* On Symbian OS, the data segment and text segement
2426 can be relocated independently. Therefore, we
2427 must indicate the segment to which this
2428 relocation is relative. The BPABI allows us to
2429 use any symbol in the right segment; we just use
2430 the section symbol as it is convenient. (We
2431 cannot use the symbol given by "h" directly as it
2432 will not appear in the dynamic symbol table.) */
2433 symbol = elf_section_data (sym_sec->output_section)->dynindx;
2434 BFD_ASSERT (symbol != 0);
2435 }
2436 else
2437 /* On SVR4-ish systems, the dynamic loader cannot
2438 relocate the text and data segments independently,
2439 so the symbol does not matter. */
2440 symbol = 0;
2441 outrel.r_info = ELF32_R_INFO (symbol, R_ARM_RELATIVE);
2442 }
2443
2444 loc = sreloc->contents;
2445 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2446 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2447
2448 /* If this reloc is against an external symbol, we do not want to
2449 fiddle with the addend. Otherwise, we need to include the symbol
2450 value so that it becomes an addend for the dynamic reloc. */
2451 if (! relocate)
2452 return bfd_reloc_ok;
2453
2454 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2455 contents, rel->r_offset, value,
2456 (bfd_vma) 0);
2457 }
2458 else switch (r_type)
2459 {
2460 #ifndef OLD_ARM_ABI
2461 case R_ARM_XPC25: /* Arm BLX instruction. */
2462 case R_ARM_CALL:
2463 case R_ARM_JUMP24:
2464 #endif
2465 case R_ARM_PC24: /* Arm B/BL instruction */
2466 case R_ARM_PLT32:
2467 #ifndef OLD_ARM_ABI
2468 if (r_type == R_ARM_XPC25)
2469 {
2470 /* Check for Arm calling Arm function. */
2471 /* FIXME: Should we translate the instruction into a BL
2472 instruction instead ? */
2473 if (sym_flags != STT_ARM_TFUNC)
2474 (*_bfd_error_handler)
2475 (_("\%B: Warning: Arm BLX instruction targets Arm function '%s'."),
2476 input_bfd,
2477 h ? h->root.root.string : "(local)");
2478 }
2479 else
2480 #endif
2481 {
2482 /* Check for Arm calling Thumb function. */
2483 if (sym_flags == STT_ARM_TFUNC)
2484 {
2485 elf32_arm_to_thumb_stub (info, sym_name, input_bfd,
2486 output_bfd, input_section,
2487 hit_data, sym_sec, rel->r_offset,
2488 signed_addend, value);
2489 return bfd_reloc_ok;
2490 }
2491 }
2492
2493 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
2494 where:
2495 S is the address of the symbol in the relocation.
2496 P is address of the instruction being relocated.
2497 A is the addend (extracted from the instruction) in bytes.
2498
2499 S is held in 'value'.
2500 P is the base address of the section containing the
2501 instruction plus the offset of the reloc into that
2502 section, ie:
2503 (input_section->output_section->vma +
2504 input_section->output_offset +
2505 rel->r_offset).
2506 A is the addend, converted into bytes, ie:
2507 (signed_addend * 4)
2508
2509 Note: None of these operations have knowledge of the pipeline
2510 size of the processor, thus it is up to the assembler to
2511 encode this information into the addend. */
2512 value -= (input_section->output_section->vma
2513 + input_section->output_offset);
2514 value -= rel->r_offset;
2515 if (globals->use_rel)
2516 value += (signed_addend << howto->size);
2517 else
2518 /* RELA addends do not have to be adjusted by howto->size. */
2519 value += signed_addend;
2520
2521 signed_addend = value;
2522 signed_addend >>= howto->rightshift;
2523
2524 /* It is not an error for an undefined weak reference to be
2525 out of range. Any program that branches to such a symbol
2526 is going to crash anyway, so there is no point worrying
2527 about getting the destination exactly right. */
2528 if (! h || h->root.type != bfd_link_hash_undefweak)
2529 {
2530 /* Perform a signed range check. */
2531 if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1))
2532 || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1)))
2533 return bfd_reloc_overflow;
2534 }
2535
2536 #ifndef OLD_ARM_ABI
2537 /* If necessary set the H bit in the BLX instruction. */
2538 if (r_type == R_ARM_XPC25 && ((value & 2) == 2))
2539 value = (signed_addend & howto->dst_mask)
2540 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask))
2541 | (1 << 24);
2542 else
2543 #endif
2544 value = (signed_addend & howto->dst_mask)
2545 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask));
2546 break;
2547
2548 case R_ARM_ABS32:
2549 value += addend;
2550 if (sym_flags == STT_ARM_TFUNC)
2551 value |= 1;
2552 break;
2553
2554 case R_ARM_REL32:
2555 value -= (input_section->output_section->vma
2556 + input_section->output_offset + rel->r_offset);
2557 value += addend;
2558 break;
2559
2560 #ifndef OLD_ARM_ABI
2561 case R_ARM_PREL31:
2562 value -= (input_section->output_section->vma
2563 + input_section->output_offset + rel->r_offset);
2564 value += signed_addend;
2565 if (! h || h->root.type != bfd_link_hash_undefweak)
2566 {
2567 /* Check for overflow */
2568 if ((value ^ (value >> 1)) & (1 << 30))
2569 return bfd_reloc_overflow;
2570 }
2571 value &= 0x7fffffff;
2572 value |= (bfd_get_32 (input_bfd, hit_data) & 0x80000000);
2573 if (sym_flags == STT_ARM_TFUNC)
2574 value |= 1;
2575 break;
2576 #endif
2577 }
2578
2579 bfd_put_32 (input_bfd, value, hit_data);
2580 return bfd_reloc_ok;
2581
2582 case R_ARM_ABS8:
2583 value += addend;
2584 if ((long) value > 0x7f || (long) value < -0x80)
2585 return bfd_reloc_overflow;
2586
2587 bfd_put_8 (input_bfd, value, hit_data);
2588 return bfd_reloc_ok;
2589
2590 case R_ARM_ABS16:
2591 value += addend;
2592
2593 if ((long) value > 0x7fff || (long) value < -0x8000)
2594 return bfd_reloc_overflow;
2595
2596 bfd_put_16 (input_bfd, value, hit_data);
2597 return bfd_reloc_ok;
2598
2599 case R_ARM_ABS12:
2600 /* Support ldr and str instruction for the arm */
2601 /* Also thumb b (unconditional branch). ??? Really? */
2602 value += addend;
2603
2604 if ((long) value > 0x7ff || (long) value < -0x800)
2605 return bfd_reloc_overflow;
2606
2607 value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000);
2608 bfd_put_32 (input_bfd, value, hit_data);
2609 return bfd_reloc_ok;
2610
2611 case R_ARM_THM_ABS5:
2612 /* Support ldr and str instructions for the thumb. */
2613 if (globals->use_rel)
2614 {
2615 /* Need to refetch addend. */
2616 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2617 /* ??? Need to determine shift amount from operand size. */
2618 addend >>= howto->rightshift;
2619 }
2620 value += addend;
2621
2622 /* ??? Isn't value unsigned? */
2623 if ((long) value > 0x1f || (long) value < -0x10)
2624 return bfd_reloc_overflow;
2625
2626 /* ??? Value needs to be properly shifted into place first. */
2627 value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f;
2628 bfd_put_16 (input_bfd, value, hit_data);
2629 return bfd_reloc_ok;
2630
2631 #ifndef OLD_ARM_ABI
2632 case R_ARM_THM_XPC22:
2633 #endif
2634 case R_ARM_THM_PC22:
2635 /* Thumb BL (branch long instruction). */
2636 {
2637 bfd_vma relocation;
2638 bfd_boolean overflow = FALSE;
2639 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data);
2640 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2);
2641 bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift;
2642 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2643 bfd_vma check;
2644 bfd_signed_vma signed_check;
2645
2646 /* Need to refetch the addend and squish the two 11 bit pieces
2647 together. */
2648 if (globals->use_rel)
2649 {
2650 bfd_vma upper = upper_insn & 0x7ff;
2651 bfd_vma lower = lower_insn & 0x7ff;
2652 upper = (upper ^ 0x400) - 0x400; /* Sign extend. */
2653 addend = (upper << 12) | (lower << 1);
2654 signed_addend = addend;
2655 }
2656 #ifndef OLD_ARM_ABI
2657 if (r_type == R_ARM_THM_XPC22)
2658 {
2659 /* Check for Thumb to Thumb call. */
2660 /* FIXME: Should we translate the instruction into a BL
2661 instruction instead ? */
2662 if (sym_flags == STT_ARM_TFUNC)
2663 (*_bfd_error_handler)
2664 (_("%B: Warning: Thumb BLX instruction targets thumb function '%s'."),
2665 input_bfd,
2666 h ? h->root.root.string : "(local)");
2667 }
2668 else
2669 #endif
2670 {
2671 /* If it is not a call to Thumb, assume call to Arm.
2672 If it is a call relative to a section name, then it is not a
2673 function call at all, but rather a long jump. Calls through
2674 the PLT do not require stubs. */
2675 if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION
2676 && (h == NULL || splt == NULL
2677 || h->plt.offset == (bfd_vma) -1))
2678 {
2679 if (elf32_thumb_to_arm_stub
2680 (info, sym_name, input_bfd, output_bfd, input_section,
2681 hit_data, sym_sec, rel->r_offset, signed_addend, value))
2682 return bfd_reloc_ok;
2683 else
2684 return bfd_reloc_dangerous;
2685 }
2686 }
2687
2688 /* Handle calls via the PLT. */
2689 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1)
2690 {
2691 value = (splt->output_section->vma
2692 + splt->output_offset
2693 + h->plt.offset);
2694 /* Target the Thumb stub before the ARM PLT entry. */
2695 value -= 4;
2696 }
2697
2698 relocation = value + signed_addend;
2699
2700 relocation -= (input_section->output_section->vma
2701 + input_section->output_offset
2702 + rel->r_offset);
2703
2704 check = relocation >> howto->rightshift;
2705
2706 /* If this is a signed value, the rightshift just dropped
2707 leading 1 bits (assuming twos complement). */
2708 if ((bfd_signed_vma) relocation >= 0)
2709 signed_check = check;
2710 else
2711 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift);
2712
2713 /* Assumes two's complement. */
2714 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2715 overflow = TRUE;
2716
2717 #ifndef OLD_ARM_ABI
2718 if (r_type == R_ARM_THM_XPC22
2719 && ((lower_insn & 0x1800) == 0x0800))
2720 /* For a BLX instruction, make sure that the relocation is rounded up
2721 to a word boundary. This follows the semantics of the instruction
2722 which specifies that bit 1 of the target address will come from bit
2723 1 of the base address. */
2724 relocation = (relocation + 2) & ~ 3;
2725 #endif
2726 /* Put RELOCATION back into the insn. */
2727 upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff);
2728 lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff);
2729
2730 /* Put the relocated value back in the object file: */
2731 bfd_put_16 (input_bfd, upper_insn, hit_data);
2732 bfd_put_16 (input_bfd, lower_insn, hit_data + 2);
2733
2734 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok);
2735 }
2736 break;
2737
2738 case R_ARM_THM_PC11:
2739 case R_ARM_THM_PC9:
2740 /* Thumb B (branch) instruction). */
2741 {
2742 bfd_signed_vma relocation;
2743 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
2744 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max;
2745 bfd_signed_vma signed_check;
2746
2747 if (globals->use_rel)
2748 {
2749 /* Need to refetch addend. */
2750 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask;
2751 if (addend & ((howto->src_mask + 1) >> 1))
2752 {
2753 signed_addend = -1;
2754 signed_addend &= ~ howto->src_mask;
2755 signed_addend |= addend;
2756 }
2757 else
2758 signed_addend = addend;
2759 /* The value in the insn has been right shifted. We need to
2760 undo this, so that we can perform the address calculation
2761 in terms of bytes. */
2762 signed_addend <<= howto->rightshift;
2763 }
2764 relocation = value + signed_addend;
2765
2766 relocation -= (input_section->output_section->vma
2767 + input_section->output_offset
2768 + rel->r_offset);
2769
2770 relocation >>= howto->rightshift;
2771 signed_check = relocation;
2772 relocation &= howto->dst_mask;
2773 relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask));
2774
2775 bfd_put_16 (input_bfd, relocation, hit_data);
2776
2777 /* Assumes two's complement. */
2778 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
2779 return bfd_reloc_overflow;
2780
2781 return bfd_reloc_ok;
2782 }
2783
2784 #ifndef OLD_ARM_ABI
2785 case R_ARM_ALU_PCREL7_0:
2786 case R_ARM_ALU_PCREL15_8:
2787 case R_ARM_ALU_PCREL23_15:
2788 {
2789 bfd_vma insn;
2790 bfd_vma relocation;
2791
2792 insn = bfd_get_32 (input_bfd, hit_data);
2793 if (globals->use_rel)
2794 {
2795 /* Extract the addend. */
2796 addend = (insn & 0xff) << ((insn & 0xf00) >> 7);
2797 signed_addend = addend;
2798 }
2799 relocation = value + signed_addend;
2800
2801 relocation -= (input_section->output_section->vma
2802 + input_section->output_offset
2803 + rel->r_offset);
2804 insn = (insn & ~0xfff)
2805 | ((howto->bitpos << 7) & 0xf00)
2806 | ((relocation >> howto->bitpos) & 0xff);
2807 bfd_put_32 (input_bfd, value, hit_data);
2808 }
2809 return bfd_reloc_ok;
2810 #endif
2811
2812 case R_ARM_GNU_VTINHERIT:
2813 case R_ARM_GNU_VTENTRY:
2814 return bfd_reloc_ok;
2815
2816 case R_ARM_COPY:
2817 return bfd_reloc_notsupported;
2818
2819 case R_ARM_GLOB_DAT:
2820 return bfd_reloc_notsupported;
2821
2822 case R_ARM_JUMP_SLOT:
2823 return bfd_reloc_notsupported;
2824
2825 case R_ARM_RELATIVE:
2826 return bfd_reloc_notsupported;
2827
2828 case R_ARM_GOTOFF:
2829 /* Relocation is relative to the start of the
2830 global offset table. */
2831
2832 BFD_ASSERT (sgot != NULL);
2833 if (sgot == NULL)
2834 return bfd_reloc_notsupported;
2835
2836 /* If we are addressing a Thumb function, we need to adjust the
2837 address by one, so that attempts to call the function pointer will
2838 correctly interpret it as Thumb code. */
2839 if (sym_flags == STT_ARM_TFUNC)
2840 value += 1;
2841
2842 /* Note that sgot->output_offset is not involved in this
2843 calculation. We always want the start of .got. If we
2844 define _GLOBAL_OFFSET_TABLE in a different way, as is
2845 permitted by the ABI, we might have to change this
2846 calculation. */
2847 value -= sgot->output_section->vma;
2848 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2849 contents, rel->r_offset, value,
2850 (bfd_vma) 0);
2851
2852 case R_ARM_GOTPC:
2853 /* Use global offset table as symbol value. */
2854 BFD_ASSERT (sgot != NULL);
2855
2856 if (sgot == NULL)
2857 return bfd_reloc_notsupported;
2858
2859 value = sgot->output_section->vma;
2860 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2861 contents, rel->r_offset, value,
2862 (bfd_vma) 0);
2863
2864 case R_ARM_GOT32:
2865 #ifndef OLD_ARM_ABI
2866 case R_ARM_GOT_PREL:
2867 #endif
2868 /* Relocation is to the entry for this symbol in the
2869 global offset table. */
2870 if (sgot == NULL)
2871 return bfd_reloc_notsupported;
2872
2873 if (h != NULL)
2874 {
2875 bfd_vma off;
2876 bfd_boolean dyn;
2877
2878 off = h->got.offset;
2879 BFD_ASSERT (off != (bfd_vma) -1);
2880 dyn = globals->root.dynamic_sections_created;
2881
2882 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2883 || (info->shared
2884 && SYMBOL_REFERENCES_LOCAL (info, h))
2885 || (ELF_ST_VISIBILITY (h->other)
2886 && h->root.type == bfd_link_hash_undefweak))
2887 {
2888 /* This is actually a static link, or it is a -Bsymbolic link
2889 and the symbol is defined locally. We must initialize this
2890 entry in the global offset table. Since the offset must
2891 always be a multiple of 4, we use the least significant bit
2892 to record whether we have initialized it already.
2893
2894 When doing a dynamic link, we create a .rel.got relocation
2895 entry to initialize the value. This is done in the
2896 finish_dynamic_symbol routine. */
2897 if ((off & 1) != 0)
2898 off &= ~1;
2899 else
2900 {
2901 /* If we are addressing a Thumb function, we need to
2902 adjust the address by one, so that attempts to
2903 call the function pointer will correctly
2904 interpret it as Thumb code. */
2905 if (sym_flags == STT_ARM_TFUNC)
2906 value |= 1;
2907
2908 bfd_put_32 (output_bfd, value, sgot->contents + off);
2909 h->got.offset |= 1;
2910 }
2911 }
2912
2913 value = sgot->output_offset + off;
2914 }
2915 else
2916 {
2917 bfd_vma off;
2918
2919 BFD_ASSERT (local_got_offsets != NULL &&
2920 local_got_offsets[r_symndx] != (bfd_vma) -1);
2921
2922 off = local_got_offsets[r_symndx];
2923
2924 /* The offset must always be a multiple of 4. We use the
2925 least significant bit to record whether we have already
2926 generated the necessary reloc. */
2927 if ((off & 1) != 0)
2928 off &= ~1;
2929 else
2930 {
2931 /* If we are addressing a Thumb function, we need to
2932 adjust the address by one, so that attempts to
2933 call the function pointer will correctly
2934 interpret it as Thumb code. */
2935 if (sym_flags == STT_ARM_TFUNC)
2936 value |= 1;
2937
2938 bfd_put_32 (output_bfd, value, sgot->contents + off);
2939
2940 if (info->shared)
2941 {
2942 asection * srelgot;
2943 Elf_Internal_Rela outrel;
2944 bfd_byte *loc;
2945
2946 srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
2947 BFD_ASSERT (srelgot != NULL);
2948
2949 outrel.r_offset = (sgot->output_section->vma
2950 + sgot->output_offset
2951 + off);
2952 outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
2953 loc = srelgot->contents;
2954 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2955 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2956 }
2957
2958 local_got_offsets[r_symndx] |= 1;
2959 }
2960
2961 value = sgot->output_offset + off;
2962 }
2963 if (r_type != R_ARM_GOT32)
2964 value += sgot->output_section->vma;
2965
2966 return _bfd_final_link_relocate (howto, input_bfd, input_section,
2967 contents, rel->r_offset, value,
2968 (bfd_vma) 0);
2969
2970 case R_ARM_SBREL32:
2971 return bfd_reloc_notsupported;
2972
2973 case R_ARM_AMP_VCALL9:
2974 return bfd_reloc_notsupported;
2975
2976 case R_ARM_RSBREL32:
2977 return bfd_reloc_notsupported;
2978
2979 case R_ARM_THM_RPC22:
2980 return bfd_reloc_notsupported;
2981
2982 case R_ARM_RREL32:
2983 return bfd_reloc_notsupported;
2984
2985 case R_ARM_RABS32:
2986 return bfd_reloc_notsupported;
2987
2988 case R_ARM_RPC24:
2989 return bfd_reloc_notsupported;
2990
2991 case R_ARM_RBASE:
2992 return bfd_reloc_notsupported;
2993
2994 case R_ARM_V4BX:
2995 if (globals->fix_v4bx)
2996 {
2997 bfd_vma insn = bfd_get_32 (input_bfd, hit_data);
2998
2999 /* Ensure that we have a BX instruction. */
3000 BFD_ASSERT ((insn & 0x0ffffff0) == 0x012fff10);
3001
3002 /* Preserve Rm (lowest four bits) and the condition code
3003 (highest four bits). Other bits encode MOV PC,Rm. */
3004 insn = (insn & 0xf000000f) | 0x01a0f000;
3005
3006 bfd_put_32 (input_bfd, insn, hit_data);
3007 }
3008 return bfd_reloc_ok;
3009
3010 default:
3011 return bfd_reloc_notsupported;
3012 }
3013 }
3014
3015 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
3016 static void
3017 arm_add_to_rel (bfd * abfd,
3018 bfd_byte * address,
3019 reloc_howto_type * howto,
3020 bfd_signed_vma increment)
3021 {
3022 bfd_signed_vma addend;
3023
3024 if (howto->type == R_ARM_THM_PC22)
3025 {
3026 int upper_insn, lower_insn;
3027 int upper, lower;
3028
3029 upper_insn = bfd_get_16 (abfd, address);
3030 lower_insn = bfd_get_16 (abfd, address + 2);
3031 upper = upper_insn & 0x7ff;
3032 lower = lower_insn & 0x7ff;
3033
3034 addend = (upper << 12) | (lower << 1);
3035 addend += increment;
3036 addend >>= 1;
3037
3038 upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff);
3039 lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff);
3040
3041 bfd_put_16 (abfd, (bfd_vma) upper_insn, address);
3042 bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2);
3043 }
3044 else
3045 {
3046 bfd_vma contents;
3047
3048 contents = bfd_get_32 (abfd, address);
3049
3050 /* Get the (signed) value from the instruction. */
3051 addend = contents & howto->src_mask;
3052 if (addend & ((howto->src_mask + 1) >> 1))
3053 {
3054 bfd_signed_vma mask;
3055
3056 mask = -1;
3057 mask &= ~ howto->src_mask;
3058 addend |= mask;
3059 }
3060
3061 /* Add in the increment, (which is a byte value). */
3062 switch (howto->type)
3063 {
3064 default:
3065 addend += increment;
3066 break;
3067
3068 case R_ARM_PC24:
3069 #ifndef OLD_ARM_ABI
3070 case R_ARM_CALL:
3071 case R_ARM_JUMP24:
3072 #endif
3073 addend <<= howto->size;
3074 addend += increment;
3075
3076 /* Should we check for overflow here ? */
3077
3078 /* Drop any undesired bits. */
3079 addend >>= howto->rightshift;
3080 break;
3081 }
3082
3083 contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask);
3084
3085 bfd_put_32 (abfd, contents, address);
3086 }
3087 }
3088
3089 /* Relocate an ARM ELF section. */
3090 static bfd_boolean
3091 elf32_arm_relocate_section (bfd * output_bfd,
3092 struct bfd_link_info * info,
3093 bfd * input_bfd,
3094 asection * input_section,
3095 bfd_byte * contents,
3096 Elf_Internal_Rela * relocs,
3097 Elf_Internal_Sym * local_syms,
3098 asection ** local_sections)
3099 {
3100 Elf_Internal_Shdr *symtab_hdr;
3101 struct elf_link_hash_entry **sym_hashes;
3102 Elf_Internal_Rela *rel;
3103 Elf_Internal_Rela *relend;
3104 const char *name;
3105 struct elf32_arm_link_hash_table * globals;
3106
3107 globals = elf32_arm_hash_table (info);
3108 if (info->relocatable && !globals->use_rel)
3109 return TRUE;
3110
3111 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
3112 sym_hashes = elf_sym_hashes (input_bfd);
3113
3114 rel = relocs;
3115 relend = relocs + input_section->reloc_count;
3116 for (; rel < relend; rel++)
3117 {
3118 int r_type;
3119 reloc_howto_type * howto;
3120 unsigned long r_symndx;
3121 Elf_Internal_Sym * sym;
3122 asection * sec;
3123 struct elf_link_hash_entry * h;
3124 bfd_vma relocation;
3125 bfd_reloc_status_type r;
3126 arelent bfd_reloc;
3127
3128 r_symndx = ELF32_R_SYM (rel->r_info);
3129 r_type = ELF32_R_TYPE (rel->r_info);
3130 r_type = arm_real_reloc_type (globals, r_type);
3131
3132 if ( r_type == R_ARM_GNU_VTENTRY
3133 || r_type == R_ARM_GNU_VTINHERIT)
3134 continue;
3135
3136 bfd_reloc.howto = elf32_arm_howto_from_type (r_type);
3137 howto = bfd_reloc.howto;
3138
3139 if (info->relocatable && globals->use_rel)
3140 {
3141 /* This is a relocatable link. We don't have to change
3142 anything, unless the reloc is against a section symbol,
3143 in which case we have to adjust according to where the
3144 section symbol winds up in the output section. */
3145 if (r_symndx < symtab_hdr->sh_info)
3146 {
3147 sym = local_syms + r_symndx;
3148 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3149 {
3150 sec = local_sections[r_symndx];
3151 arm_add_to_rel (input_bfd, contents + rel->r_offset,
3152 howto,
3153 (bfd_signed_vma) (sec->output_offset
3154 + sym->st_value));
3155 }
3156 }
3157
3158 continue;
3159 }
3160
3161 /* This is a final link. */
3162 h = NULL;
3163 sym = NULL;
3164 sec = NULL;
3165
3166 if (r_symndx < symtab_hdr->sh_info)
3167 {
3168 sym = local_syms + r_symndx;
3169 sec = local_sections[r_symndx];
3170 if (globals->use_rel)
3171 {
3172 relocation = (sec->output_section->vma
3173 + sec->output_offset
3174 + sym->st_value);
3175 if ((sec->flags & SEC_MERGE)
3176 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
3177 {
3178 asection *msec;
3179 bfd_vma addend, value;
3180
3181 if (howto->rightshift)
3182 {
3183 (*_bfd_error_handler)
3184 (_("%B(%A+0x%lx): %s relocation against SEC_MERGE section"),
3185 input_bfd, input_section,
3186 (long) rel->r_offset, howto->name);
3187 return FALSE;
3188 }
3189
3190 value = bfd_get_32 (input_bfd, contents + rel->r_offset);
3191
3192 /* Get the (signed) value from the instruction. */
3193 addend = value & howto->src_mask;
3194 if (addend & ((howto->src_mask + 1) >> 1))
3195 {
3196 bfd_signed_vma mask;
3197
3198 mask = -1;
3199 mask &= ~ howto->src_mask;
3200 addend |= mask;
3201 }
3202 msec = sec;
3203 addend =
3204 _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend)
3205 - relocation;
3206 addend += msec->output_section->vma + msec->output_offset;
3207 value = (value & ~ howto->dst_mask) | (addend & howto->dst_mask);
3208 bfd_put_32 (input_bfd, value, contents + rel->r_offset);
3209 }
3210 }
3211 else
3212 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3213 }
3214 else
3215 {
3216 bfd_boolean warned;
3217 bfd_boolean unresolved_reloc;
3218
3219 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3220 r_symndx, symtab_hdr, sym_hashes,
3221 h, sec, relocation,
3222 unresolved_reloc, warned);
3223
3224 if (unresolved_reloc || relocation != 0)
3225 {
3226 /* In these cases, we don't need the relocation value.
3227 We check specially because in some obscure cases
3228 sec->output_section will be NULL. */
3229 switch (r_type)
3230 {
3231 case R_ARM_PC24:
3232 #ifndef OLD_ARM_ABI
3233 case R_ARM_CALL:
3234 case R_ARM_JUMP24:
3235 case R_ARM_PREL31:
3236 #endif
3237 case R_ARM_ABS32:
3238 case R_ARM_THM_PC22:
3239 case R_ARM_PLT32:
3240
3241 if (info->shared
3242 && ((!info->symbolic && h->dynindx != -1)
3243 || !h->def_regular)
3244 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3245 && ((input_section->flags & SEC_ALLOC) != 0
3246 /* DWARF will emit R_ARM_ABS32 relocations in its
3247 sections against symbols defined externally
3248 in shared libraries. We can't do anything
3249 with them here. */
3250 || ((input_section->flags & SEC_DEBUGGING) != 0
3251 && h->def_dynamic))
3252 )
3253 relocation = 0;
3254 break;
3255
3256 case R_ARM_GOTPC:
3257 relocation = 0;
3258 break;
3259
3260 case R_ARM_GOT32:
3261 #ifndef OLD_ARM_ABI
3262 case R_ARM_GOT_PREL:
3263 #endif
3264 if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL
3265 (elf_hash_table (info)->dynamic_sections_created,
3266 info->shared, h))
3267 && (!info->shared
3268 || (!info->symbolic && h->dynindx != -1)
3269 || !h->def_regular))
3270 relocation = 0;
3271 break;
3272
3273 default:
3274 if (unresolved_reloc)
3275 _bfd_error_handler
3276 (_("%B(%A): warning: unresolvable relocation %d against symbol `%s'"),
3277 input_bfd, input_section,
3278 r_type,
3279 h->root.root.string);
3280 break;
3281 }
3282 }
3283 }
3284
3285 if (h != NULL)
3286 name = h->root.root.string;
3287 else
3288 {
3289 name = (bfd_elf_string_from_elf_section
3290 (input_bfd, symtab_hdr->sh_link, sym->st_name));
3291 if (name == NULL || *name == '\0')
3292 name = bfd_section_name (input_bfd, sec);
3293 }
3294
3295 r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
3296 input_section, contents, rel,
3297 relocation, info, sec, name,
3298 (h ? ELF_ST_TYPE (h->type) :
3299 ELF_ST_TYPE (sym->st_info)), h);
3300
3301 if (r != bfd_reloc_ok)
3302 {
3303 const char * msg = (const char *) 0;
3304
3305 switch (r)
3306 {
3307 case bfd_reloc_overflow:
3308 /* If the overflowing reloc was to an undefined symbol,
3309 we have already printed one error message and there
3310 is no point complaining again. */
3311 if ((! h ||
3312 h->root.type != bfd_link_hash_undefined)
3313 && (!((*info->callbacks->reloc_overflow)
3314 (info, (h ? &h->root : NULL), name, howto->name,
3315 (bfd_vma) 0, input_bfd, input_section,
3316 rel->r_offset))))
3317 return FALSE;
3318 break;
3319
3320 case bfd_reloc_undefined:
3321 if (!((*info->callbacks->undefined_symbol)
3322 (info, name, input_bfd, input_section,
3323 rel->r_offset, TRUE)))
3324 return FALSE;
3325 break;
3326
3327 case bfd_reloc_outofrange:
3328 msg = _("internal error: out of range error");
3329 goto common_error;
3330
3331 case bfd_reloc_notsupported:
3332 msg = _("internal error: unsupported relocation error");
3333 goto common_error;
3334
3335 case bfd_reloc_dangerous:
3336 msg = _("internal error: dangerous error");
3337 goto common_error;
3338
3339 default:
3340 msg = _("internal error: unknown error");
3341 /* fall through */
3342
3343 common_error:
3344 if (!((*info->callbacks->warning)
3345 (info, msg, name, input_bfd, input_section,
3346 rel->r_offset)))
3347 return FALSE;
3348 break;
3349 }
3350 }
3351 }
3352
3353 return TRUE;
3354 }
3355
3356 /* Set the right machine number. */
3357
3358 static bfd_boolean
3359 elf32_arm_object_p (bfd *abfd)
3360 {
3361 unsigned int mach;
3362
3363 mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION);
3364
3365 if (mach != bfd_mach_arm_unknown)
3366 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3367
3368 else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT)
3369 bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312);
3370
3371 else
3372 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach);
3373
3374 return TRUE;
3375 }
3376
3377 /* Function to keep ARM specific flags in the ELF header. */
3378
3379 static bfd_boolean
3380 elf32_arm_set_private_flags (bfd *abfd, flagword flags)
3381 {
3382 if (elf_flags_init (abfd)
3383 && elf_elfheader (abfd)->e_flags != flags)
3384 {
3385 if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN)
3386 {
3387 if (flags & EF_ARM_INTERWORK)
3388 (*_bfd_error_handler)
3389 (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
3390 abfd);
3391 else
3392 _bfd_error_handler
3393 (_("Warning: Clearing the interworking flag of %B due to outside request"),
3394 abfd);
3395 }
3396 }
3397 else
3398 {
3399 elf_elfheader (abfd)->e_flags = flags;
3400 elf_flags_init (abfd) = TRUE;
3401 }
3402
3403 return TRUE;
3404 }
3405
3406 /* Copy backend specific data from one object module to another. */
3407
3408 static bfd_boolean
3409 elf32_arm_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
3410 {
3411 flagword in_flags;
3412 flagword out_flags;
3413
3414 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3415 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3416 return TRUE;
3417
3418 in_flags = elf_elfheader (ibfd)->e_flags;
3419 out_flags = elf_elfheader (obfd)->e_flags;
3420
3421 if (elf_flags_init (obfd)
3422 && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN
3423 && in_flags != out_flags)
3424 {
3425 /* Cannot mix APCS26 and APCS32 code. */
3426 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3427 return FALSE;
3428
3429 /* Cannot mix float APCS and non-float APCS code. */
3430 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3431 return FALSE;
3432
3433 /* If the src and dest have different interworking flags
3434 then turn off the interworking bit. */
3435 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3436 {
3437 if (out_flags & EF_ARM_INTERWORK)
3438 _bfd_error_handler
3439 (_("Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
3440 obfd, ibfd);
3441
3442 in_flags &= ~EF_ARM_INTERWORK;
3443 }
3444
3445 /* Likewise for PIC, though don't warn for this case. */
3446 if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC))
3447 in_flags &= ~EF_ARM_PIC;
3448 }
3449
3450 elf_elfheader (obfd)->e_flags = in_flags;
3451 elf_flags_init (obfd) = TRUE;
3452
3453 /* Also copy the EI_OSABI field. */
3454 elf_elfheader (obfd)->e_ident[EI_OSABI] =
3455 elf_elfheader (ibfd)->e_ident[EI_OSABI];
3456
3457 return TRUE;
3458 }
3459
3460 /* Merge backend specific data from an object file to the output
3461 object file when linking. */
3462
3463 static bfd_boolean
3464 elf32_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
3465 {
3466 flagword out_flags;
3467 flagword in_flags;
3468 bfd_boolean flags_compatible = TRUE;
3469 asection *sec;
3470
3471 /* Check if we have the same endianess. */
3472 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
3473 return FALSE;
3474
3475 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3476 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3477 return TRUE;
3478
3479 /* The input BFD must have had its flags initialised. */
3480 /* The following seems bogus to me -- The flags are initialized in
3481 the assembler but I don't think an elf_flags_init field is
3482 written into the object. */
3483 /* BFD_ASSERT (elf_flags_init (ibfd)); */
3484
3485 in_flags = elf_elfheader (ibfd)->e_flags;
3486 out_flags = elf_elfheader (obfd)->e_flags;
3487
3488 if (!elf_flags_init (obfd))
3489 {
3490 /* If the input is the default architecture and had the default
3491 flags then do not bother setting the flags for the output
3492 architecture, instead allow future merges to do this. If no
3493 future merges ever set these flags then they will retain their
3494 uninitialised values, which surprise surprise, correspond
3495 to the default values. */
3496 if (bfd_get_arch_info (ibfd)->the_default
3497 && elf_elfheader (ibfd)->e_flags == 0)
3498 return TRUE;
3499
3500 elf_flags_init (obfd) = TRUE;
3501 elf_elfheader (obfd)->e_flags = in_flags;
3502
3503 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
3504 && bfd_get_arch_info (obfd)->the_default)
3505 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
3506
3507 return TRUE;
3508 }
3509
3510 /* Determine what should happen if the input ARM architecture
3511 does not match the output ARM architecture. */
3512 if (! bfd_arm_merge_machines (ibfd, obfd))
3513 return FALSE;
3514
3515 /* Identical flags must be compatible. */
3516 if (in_flags == out_flags)
3517 return TRUE;
3518
3519 /* Check to see if the input BFD actually contains any sections. If
3520 not, its flags may not have been initialised either, but it
3521 cannot actually cause any incompatibility. Do not short-circuit
3522 dynamic objects; their section list may be emptied by
3523 elf_link_add_object_symbols.
3524
3525 Also check to see if there are no code sections in the input.
3526 In this case there is no need to check for code specific flags.
3527 XXX - do we need to worry about floating-point format compatability
3528 in data sections ? */
3529 if (!(ibfd->flags & DYNAMIC))
3530 {
3531 bfd_boolean null_input_bfd = TRUE;
3532 bfd_boolean only_data_sections = TRUE;
3533
3534 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
3535 {
3536 /* Ignore synthetic glue sections. */
3537 if (strcmp (sec->name, ".glue_7")
3538 && strcmp (sec->name, ".glue_7t"))
3539 {
3540 if ((bfd_get_section_flags (ibfd, sec)
3541 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3542 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
3543 only_data_sections = FALSE;
3544
3545 null_input_bfd = FALSE;
3546 break;
3547 }
3548 }
3549
3550 if (null_input_bfd || only_data_sections)
3551 return TRUE;
3552 }
3553
3554 /* Complain about various flag mismatches. */
3555 if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags))
3556 {
3557 _bfd_error_handler
3558 (_("ERROR: Source object %B has EABI version %d, but target %B has EABI version %d"),
3559 ibfd, obfd,
3560 (in_flags & EF_ARM_EABIMASK) >> 24,
3561 (out_flags & EF_ARM_EABIMASK) >> 24);
3562 return FALSE;
3563 }
3564
3565 /* Not sure what needs to be checked for EABI versions >= 1. */
3566 if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN)
3567 {
3568 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26))
3569 {
3570 _bfd_error_handler
3571 (_("ERROR: %B is compiled for APCS-%d, whereas target %B uses APCS-%d"),
3572 ibfd, obfd,
3573 in_flags & EF_ARM_APCS_26 ? 26 : 32,
3574 out_flags & EF_ARM_APCS_26 ? 26 : 32);
3575 flags_compatible = FALSE;
3576 }
3577
3578 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT))
3579 {
3580 if (in_flags & EF_ARM_APCS_FLOAT)
3581 _bfd_error_handler
3582 (_("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers"),
3583 ibfd, obfd);
3584 else
3585 _bfd_error_handler
3586 (_("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers"),
3587 ibfd, obfd);
3588
3589 flags_compatible = FALSE;
3590 }
3591
3592 if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT))
3593 {
3594 if (in_flags & EF_ARM_VFP_FLOAT)
3595 _bfd_error_handler
3596 (_("ERROR: %B uses VFP instructions, whereas %B does not"),
3597 ibfd, obfd);
3598 else
3599 _bfd_error_handler
3600 (_("ERROR: %B uses FPA instructions, whereas %B does not"),
3601 ibfd, obfd);
3602
3603 flags_compatible = FALSE;
3604 }
3605
3606 if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT))
3607 {
3608 if (in_flags & EF_ARM_MAVERICK_FLOAT)
3609 _bfd_error_handler
3610 (_("ERROR: %B uses Maverick instructions, whereas %B does not"),
3611 ibfd, obfd);
3612 else
3613 _bfd_error_handler
3614 (_("ERROR: %B does not use Maverick instructions, whereas %B does"),
3615 ibfd, obfd);
3616
3617 flags_compatible = FALSE;
3618 }
3619
3620 #ifdef EF_ARM_SOFT_FLOAT
3621 if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT))
3622 {
3623 /* We can allow interworking between code that is VFP format
3624 layout, and uses either soft float or integer regs for
3625 passing floating point arguments and results. We already
3626 know that the APCS_FLOAT flags match; similarly for VFP
3627 flags. */
3628 if ((in_flags & EF_ARM_APCS_FLOAT) != 0
3629 || (in_flags & EF_ARM_VFP_FLOAT) == 0)
3630 {
3631 if (in_flags & EF_ARM_SOFT_FLOAT)
3632 _bfd_error_handler
3633 (_("ERROR: %B uses software FP, whereas %B uses hardware FP"),
3634 ibfd, obfd);
3635 else
3636 _bfd_error_handler
3637 (_("ERROR: %B uses hardware FP, whereas %B uses software FP"),
3638 ibfd, obfd);
3639
3640 flags_compatible = FALSE;
3641 }
3642 }
3643 #endif
3644
3645 /* Interworking mismatch is only a warning. */
3646 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK))
3647 {
3648 if (in_flags & EF_ARM_INTERWORK)
3649 {
3650 _bfd_error_handler
3651 (_("Warning: %B supports interworking, whereas %B does not"),
3652 ibfd, obfd);
3653 }
3654 else
3655 {
3656 _bfd_error_handler
3657 (_("Warning: %B does not support interworking, whereas %B does"),
3658 ibfd, obfd);
3659 }
3660 }
3661 }
3662
3663 return flags_compatible;
3664 }
3665
3666 /* Display the flags field. */
3667
3668 static bfd_boolean
3669 elf32_arm_print_private_bfd_data (bfd *abfd, void * ptr)
3670 {
3671 FILE * file = (FILE *) ptr;
3672 unsigned long flags;
3673
3674 BFD_ASSERT (abfd != NULL && ptr != NULL);
3675
3676 /* Print normal ELF private data. */
3677 _bfd_elf_print_private_bfd_data (abfd, ptr);
3678
3679 flags = elf_elfheader (abfd)->e_flags;
3680 /* Ignore init flag - it may not be set, despite the flags field
3681 containing valid data. */
3682
3683 /* xgettext:c-format */
3684 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
3685
3686 switch (EF_ARM_EABI_VERSION (flags))
3687 {
3688 case EF_ARM_EABI_UNKNOWN:
3689 /* The following flag bits are GNU extensions and not part of the
3690 official ARM ELF extended ABI. Hence they are only decoded if
3691 the EABI version is not set. */
3692 if (flags & EF_ARM_INTERWORK)
3693 fprintf (file, _(" [interworking enabled]"));
3694
3695 if (flags & EF_ARM_APCS_26)
3696 fprintf (file, " [APCS-26]");
3697 else
3698 fprintf (file, " [APCS-32]");
3699
3700 if (flags & EF_ARM_VFP_FLOAT)
3701 fprintf (file, _(" [VFP float format]"));
3702 else if (flags & EF_ARM_MAVERICK_FLOAT)
3703 fprintf (file, _(" [Maverick float format]"));
3704 else
3705 fprintf (file, _(" [FPA float format]"));
3706
3707 if (flags & EF_ARM_APCS_FLOAT)
3708 fprintf (file, _(" [floats passed in float registers]"));
3709
3710 if (flags & EF_ARM_PIC)
3711 fprintf (file, _(" [position independent]"));
3712
3713 if (flags & EF_ARM_NEW_ABI)
3714 fprintf (file, _(" [new ABI]"));
3715
3716 if (flags & EF_ARM_OLD_ABI)
3717 fprintf (file, _(" [old ABI]"));
3718
3719 if (flags & EF_ARM_SOFT_FLOAT)
3720 fprintf (file, _(" [software FP]"));
3721
3722 flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT
3723 | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI
3724 | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT
3725 | EF_ARM_MAVERICK_FLOAT);
3726 break;
3727
3728 case EF_ARM_EABI_VER1:
3729 fprintf (file, _(" [Version1 EABI]"));
3730
3731 if (flags & EF_ARM_SYMSARESORTED)
3732 fprintf (file, _(" [sorted symbol table]"));
3733 else
3734 fprintf (file, _(" [unsorted symbol table]"));
3735
3736 flags &= ~ EF_ARM_SYMSARESORTED;
3737 break;
3738
3739 case EF_ARM_EABI_VER2:
3740 fprintf (file, _(" [Version2 EABI]"));
3741
3742 if (flags & EF_ARM_SYMSARESORTED)
3743 fprintf (file, _(" [sorted symbol table]"));
3744 else
3745 fprintf (file, _(" [unsorted symbol table]"));
3746
3747 if (flags & EF_ARM_DYNSYMSUSESEGIDX)
3748 fprintf (file, _(" [dynamic symbols use segment index]"));
3749
3750 if (flags & EF_ARM_MAPSYMSFIRST)
3751 fprintf (file, _(" [mapping symbols precede others]"));
3752
3753 flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX
3754 | EF_ARM_MAPSYMSFIRST);
3755 break;
3756
3757 case EF_ARM_EABI_VER3:
3758 fprintf (file, _(" [Version3 EABI]"));
3759 break;
3760
3761 case EF_ARM_EABI_VER4:
3762 fprintf (file, _(" [Version4 EABI]"));
3763
3764 if (flags & EF_ARM_BE8)
3765 fprintf (file, _(" [BE8]"));
3766
3767 if (flags & EF_ARM_LE8)
3768 fprintf (file, _(" [LE8]"));
3769
3770 flags &= ~(EF_ARM_LE8 | EF_ARM_BE8);
3771 break;
3772
3773 default:
3774 fprintf (file, _(" <EABI version unrecognised>"));
3775 break;
3776 }
3777
3778 flags &= ~ EF_ARM_EABIMASK;
3779
3780 if (flags & EF_ARM_RELEXEC)
3781 fprintf (file, _(" [relocatable executable]"));
3782
3783 if (flags & EF_ARM_HASENTRY)
3784 fprintf (file, _(" [has entry point]"));
3785
3786 flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY);
3787
3788 if (flags)
3789 fprintf (file, _("<Unrecognised flag bits set>"));
3790
3791 fputc ('\n', file);
3792
3793 return TRUE;
3794 }
3795
3796 static int
3797 elf32_arm_get_symbol_type (Elf_Internal_Sym * elf_sym, int type)
3798 {
3799 switch (ELF_ST_TYPE (elf_sym->st_info))
3800 {
3801 case STT_ARM_TFUNC:
3802 return ELF_ST_TYPE (elf_sym->st_info);
3803
3804 case STT_ARM_16BIT:
3805 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
3806 This allows us to distinguish between data used by Thumb instructions
3807 and non-data (which is probably code) inside Thumb regions of an
3808 executable. */
3809 if (type != STT_OBJECT)
3810 return ELF_ST_TYPE (elf_sym->st_info);
3811 break;
3812
3813 default:
3814 break;
3815 }
3816
3817 return type;
3818 }
3819
3820 static asection *
3821 elf32_arm_gc_mark_hook (asection * sec,
3822 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3823 Elf_Internal_Rela * rel,
3824 struct elf_link_hash_entry * h,
3825 Elf_Internal_Sym * sym)
3826 {
3827 if (h != NULL)
3828 {
3829 switch (ELF32_R_TYPE (rel->r_info))
3830 {
3831 case R_ARM_GNU_VTINHERIT:
3832 case R_ARM_GNU_VTENTRY:
3833 break;
3834
3835 default:
3836 switch (h->root.type)
3837 {
3838 case bfd_link_hash_defined:
3839 case bfd_link_hash_defweak:
3840 return h->root.u.def.section;
3841
3842 case bfd_link_hash_common:
3843 return h->root.u.c.p->section;
3844
3845 default:
3846 break;
3847 }
3848 }
3849 }
3850 else
3851 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
3852
3853 return NULL;
3854 }
3855
3856 /* Update the got entry reference counts for the section being removed. */
3857
3858 static bfd_boolean
3859 elf32_arm_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
3860 struct bfd_link_info * info ATTRIBUTE_UNUSED,
3861 asection * sec ATTRIBUTE_UNUSED,
3862 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
3863 {
3864 Elf_Internal_Shdr *symtab_hdr;
3865 struct elf_link_hash_entry **sym_hashes;
3866 bfd_signed_vma *local_got_refcounts;
3867 const Elf_Internal_Rela *rel, *relend;
3868 struct elf32_arm_link_hash_table * globals;
3869
3870 globals = elf32_arm_hash_table (info);
3871
3872 elf_section_data (sec)->local_dynrel = NULL;
3873
3874 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3875 sym_hashes = elf_sym_hashes (abfd);
3876 local_got_refcounts = elf_local_got_refcounts (abfd);
3877
3878 relend = relocs + sec->reloc_count;
3879 for (rel = relocs; rel < relend; rel++)
3880 {
3881 unsigned long r_symndx;
3882 struct elf_link_hash_entry *h = NULL;
3883 int r_type;
3884
3885 r_symndx = ELF32_R_SYM (rel->r_info);
3886 if (r_symndx >= symtab_hdr->sh_info)
3887 {
3888 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3889 while (h->root.type == bfd_link_hash_indirect
3890 || h->root.type == bfd_link_hash_warning)
3891 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3892 }
3893
3894 r_type = ELF32_R_TYPE (rel->r_info);
3895 #ifndef OLD_ARM_ABI
3896 r_type = arm_real_reloc_type (globals, r_type);
3897 #endif
3898 switch (r_type)
3899 {
3900 case R_ARM_GOT32:
3901 #ifndef OLD_ARM_ABI
3902 case R_ARM_GOT_PREL:
3903 #endif
3904 if (h != NULL)
3905 {
3906 if (h->got.refcount > 0)
3907 h->got.refcount -= 1;
3908 }
3909 else if (local_got_refcounts != NULL)
3910 {
3911 if (local_got_refcounts[r_symndx] > 0)
3912 local_got_refcounts[r_symndx] -= 1;
3913 }
3914 break;
3915
3916 case R_ARM_ABS32:
3917 case R_ARM_REL32:
3918 case R_ARM_PC24:
3919 case R_ARM_PLT32:
3920 #ifndef OLD_ARM_ABI
3921 case R_ARM_CALL:
3922 case R_ARM_JUMP24:
3923 case R_ARM_PREL31:
3924 #endif
3925 case R_ARM_THM_PC22:
3926 /* Should the interworking branches be here also? */
3927
3928 if (h != NULL)
3929 {
3930 struct elf32_arm_link_hash_entry *eh;
3931 struct elf32_arm_relocs_copied **pp;
3932 struct elf32_arm_relocs_copied *p;
3933
3934 eh = (struct elf32_arm_link_hash_entry *) h;
3935
3936 if (h->plt.refcount > 0)
3937 {
3938 h->plt.refcount -= 1;
3939 if (ELF32_R_TYPE (rel->r_info) == R_ARM_THM_PC22)
3940 eh->plt_thumb_refcount--;
3941 }
3942
3943 if (r_type == R_ARM_ABS32
3944 || r_type == R_ARM_REL32)
3945 {
3946 for (pp = &eh->relocs_copied; (p = *pp) != NULL;
3947 pp = &p->next)
3948 if (p->section == sec)
3949 {
3950 p->count -= 1;
3951 if (p->count == 0)
3952 *pp = p->next;
3953 break;
3954 }
3955 }
3956 }
3957 break;
3958
3959 default:
3960 break;
3961 }
3962 }
3963
3964 return TRUE;
3965 }
3966
3967 /* Look through the relocs for a section during the first phase. */
3968
3969 static bfd_boolean
3970 elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
3971 asection *sec, const Elf_Internal_Rela *relocs)
3972 {
3973 Elf_Internal_Shdr *symtab_hdr;
3974 struct elf_link_hash_entry **sym_hashes;
3975 struct elf_link_hash_entry **sym_hashes_end;
3976 const Elf_Internal_Rela *rel;
3977 const Elf_Internal_Rela *rel_end;
3978 bfd *dynobj;
3979 asection *sreloc;
3980 bfd_vma *local_got_offsets;
3981 struct elf32_arm_link_hash_table *htab;
3982
3983 if (info->relocatable)
3984 return TRUE;
3985
3986 htab = elf32_arm_hash_table (info);
3987 sreloc = NULL;
3988
3989 dynobj = elf_hash_table (info)->dynobj;
3990 local_got_offsets = elf_local_got_offsets (abfd);
3991
3992 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3993 sym_hashes = elf_sym_hashes (abfd);
3994 sym_hashes_end = sym_hashes
3995 + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
3996
3997 if (!elf_bad_symtab (abfd))
3998 sym_hashes_end -= symtab_hdr->sh_info;
3999
4000 rel_end = relocs + sec->reloc_count;
4001 for (rel = relocs; rel < rel_end; rel++)
4002 {
4003 struct elf_link_hash_entry *h;
4004 struct elf32_arm_link_hash_entry *eh;
4005 unsigned long r_symndx;
4006 int r_type;
4007
4008 r_symndx = ELF32_R_SYM (rel->r_info);
4009 r_type = ELF32_R_TYPE (rel->r_info);
4010 #ifndef OLD_ARM_ABI
4011 r_type = arm_real_reloc_type (htab, r_type);
4012 #endif
4013 if (r_symndx < symtab_hdr->sh_info)
4014 h = NULL;
4015 else
4016 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4017
4018 eh = (struct elf32_arm_link_hash_entry *) h;
4019
4020 switch (r_type)
4021 {
4022 case R_ARM_GOT32:
4023 #ifndef OLD_ARM_ABI
4024 case R_ARM_GOT_PREL:
4025 #endif
4026 /* This symbol requires a global offset table entry. */
4027 if (h != NULL)
4028 {
4029 h->got.refcount++;
4030 }
4031 else
4032 {
4033 bfd_signed_vma *local_got_refcounts;
4034
4035 /* This is a global offset table entry for a local symbol. */
4036 local_got_refcounts = elf_local_got_refcounts (abfd);
4037 if (local_got_refcounts == NULL)
4038 {
4039 bfd_size_type size;
4040
4041 size = symtab_hdr->sh_info;
4042 size *= (sizeof (bfd_signed_vma) + sizeof (char));
4043 local_got_refcounts = bfd_zalloc (abfd, size);
4044 if (local_got_refcounts == NULL)
4045 return FALSE;
4046 elf_local_got_refcounts (abfd) = local_got_refcounts;
4047 }
4048 local_got_refcounts[r_symndx] += 1;
4049 }
4050 if (r_type == R_ARM_GOT32)
4051 break;
4052 /* Fall through. */
4053
4054 case R_ARM_GOTOFF:
4055 case R_ARM_GOTPC:
4056 if (htab->sgot == NULL)
4057 {
4058 if (htab->root.dynobj == NULL)
4059 htab->root.dynobj = abfd;
4060 if (!create_got_section (htab->root.dynobj, info))
4061 return FALSE;
4062 }
4063 break;
4064
4065 case R_ARM_ABS32:
4066 case R_ARM_REL32:
4067 case R_ARM_PC24:
4068 case R_ARM_PLT32:
4069 #ifndef OLD_ARM_ABI
4070 case R_ARM_CALL:
4071 case R_ARM_JUMP24:
4072 case R_ARM_PREL31:
4073 #endif
4074 case R_ARM_THM_PC22:
4075 /* Should the interworking branches be listed here? */
4076 if (h != NULL)
4077 {
4078 /* If this reloc is in a read-only section, we might
4079 need a copy reloc. We can't check reliably at this
4080 stage whether the section is read-only, as input
4081 sections have not yet been mapped to output sections.
4082 Tentatively set the flag for now, and correct in
4083 adjust_dynamic_symbol. */
4084 if (!info->shared)
4085 h->non_got_ref = 1;
4086
4087 /* We may need a .plt entry if the function this reloc
4088 refers to is in a different object. We can't tell for
4089 sure yet, because something later might force the
4090 symbol local. */
4091 if (r_type == R_ARM_PC24
4092 #ifndef OLD_ARM_ABI
4093 || r_type == R_ARM_CALL
4094 || r_type == R_ARM_JUMP24
4095 || r_type == R_ARM_PREL31
4096 #endif
4097 || r_type == R_ARM_PLT32
4098 || r_type == R_ARM_THM_PC22)
4099 h->needs_plt = 1;
4100
4101 /* If we create a PLT entry, this relocation will reference
4102 it, even if it's an ABS32 relocation. */
4103 h->plt.refcount += 1;
4104
4105 if (r_type == R_ARM_THM_PC22)
4106 eh->plt_thumb_refcount += 1;
4107 }
4108
4109 /* If we are creating a shared library, and this is a reloc
4110 against a global symbol, or a non PC relative reloc
4111 against a local symbol, then we need to copy the reloc
4112 into the shared library. However, if we are linking with
4113 -Bsymbolic, we do not need to copy a reloc against a
4114 global symbol which is defined in an object we are
4115 including in the link (i.e., DEF_REGULAR is set). At
4116 this point we have not seen all the input files, so it is
4117 possible that DEF_REGULAR is not set now but will be set
4118 later (it is never cleared). We account for that
4119 possibility below by storing information in the
4120 relocs_copied field of the hash table entry. */
4121 if (info->shared
4122 && (sec->flags & SEC_ALLOC) != 0
4123 && ((r_type != R_ARM_PC24
4124 && r_type != R_ARM_PLT32
4125 #ifndef OLD_ARM_ABI
4126 && r_type != R_ARM_CALL
4127 && r_type != R_ARM_JUMP24
4128 && r_type != R_ARM_PREL31
4129 #endif
4130 && r_type != R_ARM_REL32
4131 && r_type != R_ARM_THM_PC22)
4132 || (h != NULL
4133 && (! info->symbolic
4134 || !h->def_regular))))
4135 {
4136 struct elf32_arm_relocs_copied *p, **head;
4137
4138 /* When creating a shared object, we must copy these
4139 reloc types into the output file. We create a reloc
4140 section in dynobj and make room for this reloc. */
4141 if (sreloc == NULL)
4142 {
4143 const char * name;
4144
4145 name = (bfd_elf_string_from_elf_section
4146 (abfd,
4147 elf_elfheader (abfd)->e_shstrndx,
4148 elf_section_data (sec)->rel_hdr.sh_name));
4149 if (name == NULL)
4150 return FALSE;
4151
4152 BFD_ASSERT (strncmp (name, ".rel", 4) == 0
4153 && strcmp (bfd_get_section_name (abfd, sec),
4154 name + 4) == 0);
4155
4156 sreloc = bfd_get_section_by_name (dynobj, name);
4157 if (sreloc == NULL)
4158 {
4159 flagword flags;
4160
4161 sreloc = bfd_make_section (dynobj, name);
4162 flags = (SEC_HAS_CONTENTS | SEC_READONLY
4163 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
4164 if ((sec->flags & SEC_ALLOC) != 0
4165 /* BPABI objects never have dynamic
4166 relocations mapped. */
4167 && !htab->symbian_p)
4168 flags |= SEC_ALLOC | SEC_LOAD;
4169 if (sreloc == NULL
4170 || ! bfd_set_section_flags (dynobj, sreloc, flags)
4171 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
4172 return FALSE;
4173 }
4174
4175 elf_section_data (sec)->sreloc = sreloc;
4176 }
4177
4178 /* If this is a global symbol, we count the number of
4179 relocations we need for this symbol. */
4180 if (h != NULL)
4181 {
4182 head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied;
4183 }
4184 else
4185 {
4186 /* Track dynamic relocs needed for local syms too.
4187 We really need local syms available to do this
4188 easily. Oh well. */
4189
4190 asection *s;
4191 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
4192 sec, r_symndx);
4193 if (s == NULL)
4194 return FALSE;
4195
4196 head = ((struct elf32_arm_relocs_copied **)
4197 &elf_section_data (s)->local_dynrel);
4198 }
4199
4200 p = *head;
4201 if (p == NULL || p->section != sec)
4202 {
4203 bfd_size_type amt = sizeof *p;
4204
4205 p = bfd_alloc (htab->root.dynobj, amt);
4206 if (p == NULL)
4207 return FALSE;
4208 p->next = *head;
4209 *head = p;
4210 p->section = sec;
4211 p->count = 0;
4212 }
4213
4214 if (r_type == R_ARM_ABS32
4215 || r_type == R_ARM_REL32)
4216 p->count += 1;
4217 }
4218 break;
4219
4220 /* This relocation describes the C++ object vtable hierarchy.
4221 Reconstruct it for later use during GC. */
4222 case R_ARM_GNU_VTINHERIT:
4223 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4224 return FALSE;
4225 break;
4226
4227 /* This relocation describes which C++ vtable entries are actually
4228 used. Record for later use during GC. */
4229 case R_ARM_GNU_VTENTRY:
4230 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
4231 return FALSE;
4232 break;
4233 }
4234 }
4235
4236 return TRUE;
4237 }
4238
4239 static bfd_boolean
4240 is_arm_mapping_symbol_name (const char * name)
4241 {
4242 return (name != NULL)
4243 && (name[0] == '$')
4244 && ((name[1] == 'a') || (name[1] == 't') || (name[1] == 'd'))
4245 && (name[2] == 0);
4246 }
4247
4248 /* Treat mapping symbols as special target symbols. */
4249
4250 static bfd_boolean
4251 elf32_arm_is_target_special_symbol (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym)
4252 {
4253 return is_arm_mapping_symbol_name (sym->name);
4254 }
4255
4256 /* This is a copy of elf_find_function() from elf.c except that
4257 ARM mapping symbols are ignored when looking for function names
4258 and STT_ARM_TFUNC is considered to a function type. */
4259
4260 static bfd_boolean
4261 arm_elf_find_function (bfd * abfd ATTRIBUTE_UNUSED,
4262 asection * section,
4263 asymbol ** symbols,
4264 bfd_vma offset,
4265 const char ** filename_ptr,
4266 const char ** functionname_ptr)
4267 {
4268 const char * filename = NULL;
4269 asymbol * func = NULL;
4270 bfd_vma low_func = 0;
4271 asymbol ** p;
4272
4273 for (p = symbols; *p != NULL; p++)
4274 {
4275 elf_symbol_type *q;
4276
4277 q = (elf_symbol_type *) *p;
4278
4279 switch (ELF_ST_TYPE (q->internal_elf_sym.st_info))
4280 {
4281 default:
4282 break;
4283 case STT_FILE:
4284 filename = bfd_asymbol_name (&q->symbol);
4285 break;
4286 case STT_FUNC:
4287 case STT_ARM_TFUNC:
4288 /* Skip $a and $t symbols. */
4289 if ((q->symbol.flags & BSF_LOCAL)
4290 && is_arm_mapping_symbol_name (q->symbol.name))
4291 continue;
4292 /* Fall through. */
4293 case STT_NOTYPE:
4294 if (bfd_get_section (&q->symbol) == section
4295 && q->symbol.value >= low_func
4296 && q->symbol.value <= offset)
4297 {
4298 func = (asymbol *) q;
4299 low_func = q->symbol.value;
4300 }
4301 break;
4302 }
4303 }
4304
4305 if (func == NULL)
4306 return FALSE;
4307
4308 if (filename_ptr)
4309 *filename_ptr = filename;
4310 if (functionname_ptr)
4311 *functionname_ptr = bfd_asymbol_name (func);
4312
4313 return TRUE;
4314 }
4315
4316
4317 /* Find the nearest line to a particular section and offset, for error
4318 reporting. This code is a duplicate of the code in elf.c, except
4319 that it uses arm_elf_find_function. */
4320
4321 static bfd_boolean
4322 elf32_arm_find_nearest_line (bfd * abfd,
4323 asection * section,
4324 asymbol ** symbols,
4325 bfd_vma offset,
4326 const char ** filename_ptr,
4327 const char ** functionname_ptr,
4328 unsigned int * line_ptr)
4329 {
4330 bfd_boolean found = FALSE;
4331
4332 /* We skip _bfd_dwarf1_find_nearest_line since no known ARM toolchain uses it. */
4333
4334 if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
4335 filename_ptr, functionname_ptr,
4336 line_ptr, 0,
4337 & elf_tdata (abfd)->dwarf2_find_line_info))
4338 {
4339 if (!*functionname_ptr)
4340 arm_elf_find_function (abfd, section, symbols, offset,
4341 *filename_ptr ? NULL : filename_ptr,
4342 functionname_ptr);
4343
4344 return TRUE;
4345 }
4346
4347 if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset,
4348 & found, filename_ptr,
4349 functionname_ptr, line_ptr,
4350 & elf_tdata (abfd)->line_info))
4351 return FALSE;
4352
4353 if (found && (*functionname_ptr || *line_ptr))
4354 return TRUE;
4355
4356 if (symbols == NULL)
4357 return FALSE;
4358
4359 if (! arm_elf_find_function (abfd, section, symbols, offset,
4360 filename_ptr, functionname_ptr))
4361 return FALSE;
4362
4363 *line_ptr = 0;
4364 return TRUE;
4365 }
4366
4367 /* Adjust a symbol defined by a dynamic object and referenced by a
4368 regular object. The current definition is in some section of the
4369 dynamic object, but we're not including those sections. We have to
4370 change the definition to something the rest of the link can
4371 understand. */
4372
4373 static bfd_boolean
4374 elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info,
4375 struct elf_link_hash_entry * h)
4376 {
4377 bfd * dynobj;
4378 asection * s;
4379 unsigned int power_of_two;
4380 struct elf32_arm_link_hash_entry * eh;
4381
4382 dynobj = elf_hash_table (info)->dynobj;
4383
4384 /* Make sure we know what is going on here. */
4385 BFD_ASSERT (dynobj != NULL
4386 && (h->needs_plt
4387 || h->u.weakdef != NULL
4388 || (h->def_dynamic
4389 && h->ref_regular
4390 && !h->def_regular)));
4391
4392 eh = (struct elf32_arm_link_hash_entry *) h;
4393
4394 /* If this is a function, put it in the procedure linkage table. We
4395 will fill in the contents of the procedure linkage table later,
4396 when we know the address of the .got section. */
4397 if (h->type == STT_FUNC || h->type == STT_ARM_TFUNC
4398 || h->needs_plt)
4399 {
4400 if (h->plt.refcount <= 0
4401 || SYMBOL_CALLS_LOCAL (info, h)
4402 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4403 && h->root.type == bfd_link_hash_undefweak))
4404 {
4405 /* This case can occur if we saw a PLT32 reloc in an input
4406 file, but the symbol was never referred to by a dynamic
4407 object, or if all references were garbage collected. In
4408 such a case, we don't actually need to build a procedure
4409 linkage table, and we can just do a PC24 reloc instead. */
4410 h->plt.offset = (bfd_vma) -1;
4411 eh->plt_thumb_refcount = 0;
4412 h->needs_plt = 0;
4413 }
4414
4415 return TRUE;
4416 }
4417 else
4418 {
4419 /* It's possible that we incorrectly decided a .plt reloc was
4420 needed for an R_ARM_PC24 or similar reloc to a non-function sym
4421 in check_relocs. We can't decide accurately between function
4422 and non-function syms in check-relocs; Objects loaded later in
4423 the link may change h->type. So fix it now. */
4424 h->plt.offset = (bfd_vma) -1;
4425 eh->plt_thumb_refcount = 0;
4426 }
4427
4428 /* If this is a weak symbol, and there is a real definition, the
4429 processor independent code will have arranged for us to see the
4430 real definition first, and we can just use the same value. */
4431 if (h->u.weakdef != NULL)
4432 {
4433 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
4434 || h->u.weakdef->root.type == bfd_link_hash_defweak);
4435 h->root.u.def.section = h->u.weakdef->root.u.def.section;
4436 h->root.u.def.value = h->u.weakdef->root.u.def.value;
4437 return TRUE;
4438 }
4439
4440 /* This is a reference to a symbol defined by a dynamic object which
4441 is not a function. */
4442
4443 /* If we are creating a shared library, we must presume that the
4444 only references to the symbol are via the global offset table.
4445 For such cases we need not do anything here; the relocations will
4446 be handled correctly by relocate_section. */
4447 if (info->shared)
4448 return TRUE;
4449
4450 /* We must allocate the symbol in our .dynbss section, which will
4451 become part of the .bss section of the executable. There will be
4452 an entry for this symbol in the .dynsym section. The dynamic
4453 object will contain position independent code, so all references
4454 from the dynamic object to this symbol will go through the global
4455 offset table. The dynamic linker will use the .dynsym entry to
4456 determine the address it must put in the global offset table, so
4457 both the dynamic object and the regular object will refer to the
4458 same memory location for the variable. */
4459 s = bfd_get_section_by_name (dynobj, ".dynbss");
4460 BFD_ASSERT (s != NULL);
4461
4462 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
4463 copy the initial value out of the dynamic object and into the
4464 runtime process image. We need to remember the offset into the
4465 .rel.bss section we are going to use. */
4466 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
4467 {
4468 asection *srel;
4469
4470 srel = bfd_get_section_by_name (dynobj, ".rel.bss");
4471 BFD_ASSERT (srel != NULL);
4472 srel->size += sizeof (Elf32_External_Rel);
4473 h->needs_copy = 1;
4474 }
4475
4476 /* We need to figure out the alignment required for this symbol. I
4477 have no idea how ELF linkers handle this. */
4478 power_of_two = bfd_log2 (h->size);
4479 if (power_of_two > 3)
4480 power_of_two = 3;
4481
4482 /* Apply the required alignment. */
4483 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
4484 if (power_of_two > bfd_get_section_alignment (dynobj, s))
4485 {
4486 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
4487 return FALSE;
4488 }
4489
4490 /* Define the symbol as being at this point in the section. */
4491 h->root.u.def.section = s;
4492 h->root.u.def.value = s->size;
4493
4494 /* Increment the section size to make room for the symbol. */
4495 s->size += h->size;
4496
4497 return TRUE;
4498 }
4499
4500 /* Allocate space in .plt, .got and associated reloc sections for
4501 dynamic relocs. */
4502
4503 static bfd_boolean
4504 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
4505 {
4506 struct bfd_link_info *info;
4507 struct elf32_arm_link_hash_table *htab;
4508 struct elf32_arm_link_hash_entry *eh;
4509 struct elf32_arm_relocs_copied *p;
4510
4511 eh = (struct elf32_arm_link_hash_entry *) h;
4512
4513 if (h->root.type == bfd_link_hash_indirect)
4514 return TRUE;
4515
4516 if (h->root.type == bfd_link_hash_warning)
4517 /* When warning symbols are created, they **replace** the "real"
4518 entry in the hash table, thus we never get to see the real
4519 symbol in a hash traversal. So look at it now. */
4520 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4521
4522 info = (struct bfd_link_info *) inf;
4523 htab = elf32_arm_hash_table (info);
4524
4525 if (htab->root.dynamic_sections_created
4526 && h->plt.refcount > 0)
4527 {
4528 /* Make sure this symbol is output as a dynamic symbol.
4529 Undefined weak syms won't yet be marked as dynamic. */
4530 if (h->dynindx == -1
4531 && !h->forced_local)
4532 {
4533 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4534 return FALSE;
4535 }
4536
4537 if (info->shared
4538 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
4539 {
4540 asection *s = htab->splt;
4541
4542 /* If this is the first .plt entry, make room for the special
4543 first entry. */
4544 if (s->size == 0)
4545 s->size += htab->plt_header_size;
4546
4547 h->plt.offset = s->size;
4548
4549 /* If we will insert a Thumb trampoline before this PLT, leave room
4550 for it. */
4551 if (!htab->symbian_p && eh->plt_thumb_refcount > 0)
4552 {
4553 h->plt.offset += PLT_THUMB_STUB_SIZE;
4554 s->size += PLT_THUMB_STUB_SIZE;
4555 }
4556
4557 /* If this symbol is not defined in a regular file, and we are
4558 not generating a shared library, then set the symbol to this
4559 location in the .plt. This is required to make function
4560 pointers compare as equal between the normal executable and
4561 the shared library. */
4562 if (! info->shared
4563 && !h->def_regular)
4564 {
4565 h->root.u.def.section = s;
4566 h->root.u.def.value = h->plt.offset;
4567
4568 /* Make sure the function is not marked as Thumb, in case
4569 it is the target of an ABS32 relocation, which will
4570 point to the PLT entry. */
4571 if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC)
4572 h->type = ELF_ST_INFO (ELF_ST_BIND (h->type), STT_FUNC);
4573 }
4574
4575 /* Make room for this entry. */
4576 s->size += htab->plt_entry_size;
4577
4578 if (!htab->symbian_p)
4579 {
4580 /* We also need to make an entry in the .got.plt section, which
4581 will be placed in the .got section by the linker script. */
4582 eh->plt_got_offset = htab->sgotplt->size;
4583 htab->sgotplt->size += 4;
4584 }
4585
4586 /* We also need to make an entry in the .rel.plt section. */
4587 htab->srelplt->size += sizeof (Elf32_External_Rel);
4588 }
4589 else
4590 {
4591 h->plt.offset = (bfd_vma) -1;
4592 h->needs_plt = 0;
4593 }
4594 }
4595 else
4596 {
4597 h->plt.offset = (bfd_vma) -1;
4598 h->needs_plt = 0;
4599 }
4600
4601 if (h->got.refcount > 0)
4602 {
4603 asection *s;
4604 bfd_boolean dyn;
4605
4606 /* Make sure this symbol is output as a dynamic symbol.
4607 Undefined weak syms won't yet be marked as dynamic. */
4608 if (h->dynindx == -1
4609 && !h->forced_local)
4610 {
4611 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4612 return FALSE;
4613 }
4614
4615 if (!htab->symbian_p)
4616 {
4617 s = htab->sgot;
4618 h->got.offset = s->size;
4619 s->size += 4;
4620 dyn = htab->root.dynamic_sections_created;
4621 if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4622 || h->root.type != bfd_link_hash_undefweak)
4623 && (info->shared
4624 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
4625 htab->srelgot->size += sizeof (Elf32_External_Rel);
4626 }
4627 }
4628 else
4629 h->got.offset = (bfd_vma) -1;
4630
4631 if (eh->relocs_copied == NULL)
4632 return TRUE;
4633
4634 /* In the shared -Bsymbolic case, discard space allocated for
4635 dynamic pc-relative relocs against symbols which turn out to be
4636 defined in regular objects. For the normal shared case, discard
4637 space for pc-relative relocs that have become local due to symbol
4638 visibility changes. */
4639
4640 if (info->shared)
4641 {
4642 /* Discard relocs on undefined weak syms with non-default
4643 visibility. */
4644 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
4645 && h->root.type == bfd_link_hash_undefweak)
4646 eh->relocs_copied = NULL;
4647 }
4648 else
4649 {
4650 /* For the non-shared case, discard space for relocs against
4651 symbols which turn out to need copy relocs or are not
4652 dynamic. */
4653
4654 if (!h->non_got_ref
4655 && ((h->def_dynamic
4656 && !h->def_regular)
4657 || (htab->root.dynamic_sections_created
4658 && (h->root.type == bfd_link_hash_undefweak
4659 || h->root.type == bfd_link_hash_undefined))))
4660 {
4661 /* Make sure this symbol is output as a dynamic symbol.
4662 Undefined weak syms won't yet be marked as dynamic. */
4663 if (h->dynindx == -1
4664 && !h->forced_local)
4665 {
4666 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4667 return FALSE;
4668 }
4669
4670 /* If that succeeded, we know we'll be keeping all the
4671 relocs. */
4672 if (h->dynindx != -1)
4673 goto keep;
4674 }
4675
4676 eh->relocs_copied = NULL;
4677
4678 keep: ;
4679 }
4680
4681 /* Finally, allocate space. */
4682 for (p = eh->relocs_copied; p != NULL; p = p->next)
4683 {
4684 asection *sreloc = elf_section_data (p->section)->sreloc;
4685 sreloc->size += p->count * sizeof (Elf32_External_Rel);
4686 }
4687
4688 return TRUE;
4689 }
4690
4691 /* Find any dynamic relocs that apply to read-only sections. */
4692
4693 static bfd_boolean
4694 elf32_arm_readonly_dynrelocs (struct elf_link_hash_entry *h, PTR inf)
4695 {
4696 struct elf32_arm_link_hash_entry *eh;
4697 struct elf32_arm_relocs_copied *p;
4698
4699 if (h->root.type == bfd_link_hash_warning)
4700 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4701
4702 eh = (struct elf32_arm_link_hash_entry *) h;
4703 for (p = eh->relocs_copied; p != NULL; p = p->next)
4704 {
4705 asection *s = p->section;
4706
4707 if (s != NULL && (s->flags & SEC_READONLY) != 0)
4708 {
4709 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4710
4711 info->flags |= DF_TEXTREL;
4712
4713 /* Not an error, just cut short the traversal. */
4714 return FALSE;
4715 }
4716 }
4717 return TRUE;
4718 }
4719
4720 /* Set the sizes of the dynamic sections. */
4721
4722 static bfd_boolean
4723 elf32_arm_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
4724 struct bfd_link_info * info)
4725 {
4726 bfd * dynobj;
4727 asection * s;
4728 bfd_boolean plt;
4729 bfd_boolean relocs;
4730 bfd *ibfd;
4731 struct elf32_arm_link_hash_table *htab;
4732
4733 htab = elf32_arm_hash_table (info);
4734 dynobj = elf_hash_table (info)->dynobj;
4735 BFD_ASSERT (dynobj != NULL);
4736
4737 if (elf_hash_table (info)->dynamic_sections_created)
4738 {
4739 /* Set the contents of the .interp section to the interpreter. */
4740 if (info->executable)
4741 {
4742 s = bfd_get_section_by_name (dynobj, ".interp");
4743 BFD_ASSERT (s != NULL);
4744 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
4745 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
4746 }
4747 }
4748
4749 /* Set up .got offsets for local syms, and space for local dynamic
4750 relocs. */
4751 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
4752 {
4753 bfd_signed_vma *local_got;
4754 bfd_signed_vma *end_local_got;
4755 char *local_tls_type;
4756 bfd_size_type locsymcount;
4757 Elf_Internal_Shdr *symtab_hdr;
4758 asection *srel;
4759
4760 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
4761 continue;
4762
4763 for (s = ibfd->sections; s != NULL; s = s->next)
4764 {
4765 struct elf32_arm_relocs_copied *p;
4766
4767 for (p = *((struct elf32_arm_relocs_copied **)
4768 &elf_section_data (s)->local_dynrel);
4769 p != NULL;
4770 p = p->next)
4771 {
4772 if (!bfd_is_abs_section (p->section)
4773 && bfd_is_abs_section (p->section->output_section))
4774 {
4775 /* Input section has been discarded, either because
4776 it is a copy of a linkonce section or due to
4777 linker script /DISCARD/, so we'll be discarding
4778 the relocs too. */
4779 }
4780 else if (p->count != 0)
4781 {
4782 srel = elf_section_data (p->section)->sreloc;
4783 srel->size += p->count * sizeof (Elf32_External_Rel);
4784 if ((p->section->output_section->flags & SEC_READONLY) != 0)
4785 info->flags |= DF_TEXTREL;
4786 }
4787 }
4788 }
4789
4790 local_got = elf_local_got_refcounts (ibfd);
4791 if (!local_got)
4792 continue;
4793
4794 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
4795 locsymcount = symtab_hdr->sh_info;
4796 end_local_got = local_got + locsymcount;
4797 s = htab->sgot;
4798 srel = htab->srelgot;
4799 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
4800 {
4801 if (*local_got > 0)
4802 {
4803 *local_got = s->size;
4804 s->size += 4;
4805 if (info->shared)
4806 srel->size += sizeof (Elf32_External_Rel);
4807 }
4808 else
4809 *local_got = (bfd_vma) -1;
4810 }
4811 }
4812
4813 /* Allocate global sym .plt and .got entries, and space for global
4814 sym dynamic relocs. */
4815 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info);
4816
4817 /* The check_relocs and adjust_dynamic_symbol entry points have
4818 determined the sizes of the various dynamic sections. Allocate
4819 memory for them. */
4820 plt = FALSE;
4821 relocs = FALSE;
4822 for (s = dynobj->sections; s != NULL; s = s->next)
4823 {
4824 const char * name;
4825 bfd_boolean strip;
4826
4827 if ((s->flags & SEC_LINKER_CREATED) == 0)
4828 continue;
4829
4830 /* It's OK to base decisions on the section name, because none
4831 of the dynobj section names depend upon the input files. */
4832 name = bfd_get_section_name (dynobj, s);
4833
4834 strip = FALSE;
4835
4836 if (strcmp (name, ".plt") == 0)
4837 {
4838 if (s->size == 0)
4839 {
4840 /* Strip this section if we don't need it; see the
4841 comment below. */
4842 strip = TRUE;
4843 }
4844 else
4845 {
4846 /* Remember whether there is a PLT. */
4847 plt = TRUE;
4848 }
4849 }
4850 else if (strncmp (name, ".rel", 4) == 0)
4851 {
4852 if (s->size == 0)
4853 {
4854 /* If we don't need this section, strip it from the
4855 output file. This is mostly to handle .rel.bss and
4856 .rel.plt. We must create both sections in
4857 create_dynamic_sections, because they must be created
4858 before the linker maps input sections to output
4859 sections. The linker does that before
4860 adjust_dynamic_symbol is called, and it is that
4861 function which decides whether anything needs to go
4862 into these sections. */
4863 strip = TRUE;
4864 }
4865 else
4866 {
4867 /* Remember whether there are any reloc sections other
4868 than .rel.plt. */
4869 if (strcmp (name, ".rel.plt") != 0)
4870 relocs = TRUE;
4871
4872 /* We use the reloc_count field as a counter if we need
4873 to copy relocs into the output file. */
4874 s->reloc_count = 0;
4875 }
4876 }
4877 else if (strncmp (name, ".got", 4) != 0)
4878 {
4879 /* It's not one of our sections, so don't allocate space. */
4880 continue;
4881 }
4882
4883 if (strip)
4884 {
4885 _bfd_strip_section_from_output (info, s);
4886 continue;
4887 }
4888
4889 /* Allocate memory for the section contents. */
4890 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
4891 if (s->contents == NULL && s->size != 0)
4892 return FALSE;
4893 }
4894
4895 if (elf_hash_table (info)->dynamic_sections_created)
4896 {
4897 /* Add some entries to the .dynamic section. We fill in the
4898 values later, in elf32_arm_finish_dynamic_sections, but we
4899 must add the entries now so that we get the correct size for
4900 the .dynamic section. The DT_DEBUG entry is filled in by the
4901 dynamic linker and used by the debugger. */
4902 #define add_dynamic_entry(TAG, VAL) \
4903 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4904
4905 if (!info->shared)
4906 {
4907 if (!add_dynamic_entry (DT_DEBUG, 0))
4908 return FALSE;
4909 }
4910
4911 if (plt)
4912 {
4913 if ( !add_dynamic_entry (DT_PLTGOT, 0)
4914 || !add_dynamic_entry (DT_PLTRELSZ, 0)
4915 || !add_dynamic_entry (DT_PLTREL, DT_REL)
4916 || !add_dynamic_entry (DT_JMPREL, 0))
4917 return FALSE;
4918 }
4919
4920 if (relocs)
4921 {
4922 if ( !add_dynamic_entry (DT_REL, 0)
4923 || !add_dynamic_entry (DT_RELSZ, 0)
4924 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
4925 return FALSE;
4926 }
4927
4928 /* If any dynamic relocs apply to a read-only section,
4929 then we need a DT_TEXTREL entry. */
4930 if ((info->flags & DF_TEXTREL) == 0)
4931 elf_link_hash_traverse (&htab->root, elf32_arm_readonly_dynrelocs,
4932 (PTR) info);
4933
4934 if ((info->flags & DF_TEXTREL) != 0)
4935 {
4936 if (!add_dynamic_entry (DT_TEXTREL, 0))
4937 return FALSE;
4938 info->flags |= DF_TEXTREL;
4939 }
4940 }
4941 #undef add_synamic_entry
4942
4943 return TRUE;
4944 }
4945
4946 /* Finish up dynamic symbol handling. We set the contents of various
4947 dynamic sections here. */
4948
4949 static bfd_boolean
4950 elf32_arm_finish_dynamic_symbol (bfd * output_bfd, struct bfd_link_info * info,
4951 struct elf_link_hash_entry * h, Elf_Internal_Sym * sym)
4952 {
4953 bfd * dynobj;
4954 struct elf32_arm_link_hash_table *htab;
4955 struct elf32_arm_link_hash_entry *eh;
4956
4957 dynobj = elf_hash_table (info)->dynobj;
4958 htab = elf32_arm_hash_table (info);
4959 eh = (struct elf32_arm_link_hash_entry *) h;
4960
4961 if (h->plt.offset != (bfd_vma) -1)
4962 {
4963 asection * splt;
4964 asection * srel;
4965 bfd_byte *loc;
4966 bfd_vma plt_index;
4967 Elf_Internal_Rela rel;
4968
4969 /* This symbol has an entry in the procedure linkage table. Set
4970 it up. */
4971
4972 BFD_ASSERT (h->dynindx != -1);
4973
4974 splt = bfd_get_section_by_name (dynobj, ".plt");
4975 srel = bfd_get_section_by_name (dynobj, ".rel.plt");
4976 BFD_ASSERT (splt != NULL && srel != NULL);
4977
4978 /* Fill in the entry in the procedure linkage table. */
4979 if (htab->symbian_p)
4980 {
4981 unsigned i;
4982 for (i = 0; i < htab->plt_entry_size / 4; ++i)
4983 bfd_put_32 (output_bfd,
4984 elf32_arm_symbian_plt_entry[i],
4985 splt->contents + h->plt.offset + 4 * i);
4986
4987 /* Fill in the entry in the .rel.plt section. */
4988 rel.r_offset = (splt->output_section->vma
4989 + splt->output_offset
4990 + h->plt.offset + 4 * (i - 1));
4991 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
4992
4993 /* Get the index in the procedure linkage table which
4994 corresponds to this symbol. This is the index of this symbol
4995 in all the symbols for which we are making plt entries. The
4996 first entry in the procedure linkage table is reserved. */
4997 plt_index = ((h->plt.offset - htab->plt_header_size)
4998 / htab->plt_entry_size);
4999 }
5000 else
5001 {
5002 bfd_vma got_offset;
5003 bfd_vma got_displacement;
5004 asection * sgot;
5005
5006 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
5007 BFD_ASSERT (sgot != NULL);
5008
5009 /* Get the offset into the .got.plt table of the entry that
5010 corresponds to this function. */
5011 got_offset = eh->plt_got_offset;
5012
5013 /* Get the index in the procedure linkage table which
5014 corresponds to this symbol. This is the index of this symbol
5015 in all the symbols for which we are making plt entries. The
5016 first three entries in .got.plt are reserved; after that
5017 symbols appear in the same order as in .plt. */
5018 plt_index = (got_offset - 12) / 4;
5019
5020 /* Calculate the displacement between the PLT slot and the
5021 entry in the GOT. The eight-byte offset accounts for the
5022 value produced by adding to pc in the first instruction
5023 of the PLT stub. */
5024 got_displacement = (sgot->output_section->vma
5025 + sgot->output_offset
5026 + got_offset
5027 - splt->output_section->vma
5028 - splt->output_offset
5029 - h->plt.offset
5030 - 8);
5031
5032 BFD_ASSERT ((got_displacement & 0xf0000000) == 0);
5033
5034 if (eh->plt_thumb_refcount > 0)
5035 {
5036 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[0],
5037 splt->contents + h->plt.offset - 4);
5038 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[1],
5039 splt->contents + h->plt.offset - 2);
5040 }
5041
5042 bfd_put_32 (output_bfd, elf32_arm_plt_entry[0] | ((got_displacement & 0x0ff00000) >> 20),
5043 splt->contents + h->plt.offset + 0);
5044 bfd_put_32 (output_bfd, elf32_arm_plt_entry[1] | ((got_displacement & 0x000ff000) >> 12),
5045 splt->contents + h->plt.offset + 4);
5046 bfd_put_32 (output_bfd, elf32_arm_plt_entry[2] | (got_displacement & 0x00000fff),
5047 splt->contents + h->plt.offset + 8);
5048 #ifdef FOUR_WORD_PLT
5049 bfd_put_32 (output_bfd, elf32_arm_plt_entry[3],
5050 splt->contents + h->plt.offset + 12);
5051 #endif
5052
5053 /* Fill in the entry in the global offset table. */
5054 bfd_put_32 (output_bfd,
5055 (splt->output_section->vma
5056 + splt->output_offset),
5057 sgot->contents + got_offset);
5058
5059 /* Fill in the entry in the .rel.plt section. */
5060 rel.r_offset = (sgot->output_section->vma
5061 + sgot->output_offset
5062 + got_offset);
5063 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT);
5064 }
5065
5066 loc = srel->contents + plt_index * sizeof (Elf32_External_Rel);
5067 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5068
5069 if (!h->def_regular)
5070 {
5071 /* Mark the symbol as undefined, rather than as defined in
5072 the .plt section. Leave the value alone. */
5073 sym->st_shndx = SHN_UNDEF;
5074 /* If the symbol is weak, we do need to clear the value.
5075 Otherwise, the PLT entry would provide a definition for
5076 the symbol even if the symbol wasn't defined anywhere,
5077 and so the symbol would never be NULL. */
5078 if (!h->ref_regular_nonweak)
5079 sym->st_value = 0;
5080 }
5081 }
5082
5083 if (h->got.offset != (bfd_vma) -1)
5084 {
5085 asection * sgot;
5086 asection * srel;
5087 Elf_Internal_Rela rel;
5088 bfd_byte *loc;
5089
5090 /* This symbol has an entry in the global offset table. Set it
5091 up. */
5092 sgot = bfd_get_section_by_name (dynobj, ".got");
5093 srel = bfd_get_section_by_name (dynobj, ".rel.got");
5094 BFD_ASSERT (sgot != NULL && srel != NULL);
5095
5096 rel.r_offset = (sgot->output_section->vma
5097 + sgot->output_offset
5098 + (h->got.offset &~ (bfd_vma) 1));
5099
5100 /* If this is a static link, or it is a -Bsymbolic link and the
5101 symbol is defined locally or was forced to be local because
5102 of a version file, we just want to emit a RELATIVE reloc.
5103 The entry in the global offset table will already have been
5104 initialized in the relocate_section function. */
5105 if (info->shared
5106 && SYMBOL_REFERENCES_LOCAL (info, h))
5107 {
5108 BFD_ASSERT((h->got.offset & 1) != 0);
5109 rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
5110 }
5111 else
5112 {
5113 BFD_ASSERT((h->got.offset & 1) == 0);
5114 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
5115 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT);
5116 }
5117
5118 loc = srel->contents + srel->reloc_count++ * sizeof (Elf32_External_Rel);
5119 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5120 }
5121
5122 if (h->needs_copy)
5123 {
5124 asection * s;
5125 Elf_Internal_Rela rel;
5126 bfd_byte *loc;
5127
5128 /* This symbol needs a copy reloc. Set it up. */
5129 BFD_ASSERT (h->dynindx != -1
5130 && (h->root.type == bfd_link_hash_defined
5131 || h->root.type == bfd_link_hash_defweak));
5132
5133 s = bfd_get_section_by_name (h->root.u.def.section->owner,
5134 ".rel.bss");
5135 BFD_ASSERT (s != NULL);
5136
5137 rel.r_offset = (h->root.u.def.value
5138 + h->root.u.def.section->output_section->vma
5139 + h->root.u.def.section->output_offset);
5140 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY);
5141 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rel);
5142 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5143 }
5144
5145 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
5146 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
5147 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
5148 sym->st_shndx = SHN_ABS;
5149
5150 return TRUE;
5151 }
5152
5153 /* Finish up the dynamic sections. */
5154
5155 static bfd_boolean
5156 elf32_arm_finish_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info)
5157 {
5158 bfd * dynobj;
5159 asection * sgot;
5160 asection * sdyn;
5161
5162 dynobj = elf_hash_table (info)->dynobj;
5163
5164 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
5165 BFD_ASSERT (elf32_arm_hash_table (info)->symbian_p || sgot != NULL);
5166 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
5167
5168 if (elf_hash_table (info)->dynamic_sections_created)
5169 {
5170 asection *splt;
5171 Elf32_External_Dyn *dyncon, *dynconend;
5172 struct elf32_arm_link_hash_table *htab;
5173
5174 htab = elf32_arm_hash_table (info);
5175 splt = bfd_get_section_by_name (dynobj, ".plt");
5176 BFD_ASSERT (splt != NULL && sdyn != NULL);
5177
5178 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5179 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5180
5181 for (; dyncon < dynconend; dyncon++)
5182 {
5183 Elf_Internal_Dyn dyn;
5184 const char * name;
5185 asection * s;
5186
5187 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5188
5189 switch (dyn.d_tag)
5190 {
5191 unsigned int type;
5192
5193 default:
5194 break;
5195
5196 case DT_HASH:
5197 name = ".hash";
5198 goto get_vma_if_bpabi;
5199 case DT_STRTAB:
5200 name = ".dynstr";
5201 goto get_vma_if_bpabi;
5202 case DT_SYMTAB:
5203 name = ".dynsym";
5204 goto get_vma_if_bpabi;
5205 case DT_VERSYM:
5206 name = ".gnu.version";
5207 goto get_vma_if_bpabi;
5208 case DT_VERDEF:
5209 name = ".gnu.version_d";
5210 goto get_vma_if_bpabi;
5211 case DT_VERNEED:
5212 name = ".gnu.version_r";
5213 goto get_vma_if_bpabi;
5214
5215 case DT_PLTGOT:
5216 name = ".got";
5217 goto get_vma;
5218 case DT_JMPREL:
5219 name = ".rel.plt";
5220 get_vma:
5221 s = bfd_get_section_by_name (output_bfd, name);
5222 BFD_ASSERT (s != NULL);
5223 if (!htab->symbian_p)
5224 dyn.d_un.d_ptr = s->vma;
5225 else
5226 /* In the BPABI, tags in the PT_DYNAMIC section point
5227 at the file offset, not the memory address, for the
5228 convenience of the post linker. */
5229 dyn.d_un.d_ptr = s->filepos;
5230 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5231 break;
5232
5233 get_vma_if_bpabi:
5234 if (htab->symbian_p)
5235 goto get_vma;
5236 break;
5237
5238 case DT_PLTRELSZ:
5239 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5240 BFD_ASSERT (s != NULL);
5241 dyn.d_un.d_val = s->size;
5242 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5243 break;
5244
5245 case DT_RELSZ:
5246 if (!htab->symbian_p)
5247 {
5248 /* My reading of the SVR4 ABI indicates that the
5249 procedure linkage table relocs (DT_JMPREL) should be
5250 included in the overall relocs (DT_REL). This is
5251 what Solaris does. However, UnixWare can not handle
5252 that case. Therefore, we override the DT_RELSZ entry
5253 here to make it not include the JMPREL relocs. Since
5254 the linker script arranges for .rel.plt to follow all
5255 other relocation sections, we don't have to worry
5256 about changing the DT_REL entry. */
5257 s = bfd_get_section_by_name (output_bfd, ".rel.plt");
5258 if (s != NULL)
5259 dyn.d_un.d_val -= s->size;
5260 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5261 break;
5262 }
5263 /* Fall through */
5264
5265 case DT_REL:
5266 case DT_RELA:
5267 case DT_RELASZ:
5268 /* In the BPABI, the DT_REL tag must point at the file
5269 offset, not the VMA, of the first relocation
5270 section. So, we use code similar to that in
5271 elflink.c, but do not check for SHF_ALLOC on the
5272 relcoation section, since relocations sections are
5273 never allocated under the BPABI. The comments above
5274 about Unixware notwithstanding, we include all of the
5275 relocations here. */
5276 if (htab->symbian_p)
5277 {
5278 unsigned int i;
5279 type = ((dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5280 ? SHT_REL : SHT_RELA);
5281 dyn.d_un.d_val = 0;
5282 for (i = 1; i < elf_numsections (output_bfd); i++)
5283 {
5284 Elf_Internal_Shdr *hdr
5285 = elf_elfsections (output_bfd)[i];
5286 if (hdr->sh_type == type)
5287 {
5288 if (dyn.d_tag == DT_RELSZ
5289 || dyn.d_tag == DT_RELASZ)
5290 dyn.d_un.d_val += hdr->sh_size;
5291 else if ((ufile_ptr) hdr->sh_offset
5292 <= dyn.d_un.d_val - 1)
5293 dyn.d_un.d_val = hdr->sh_offset;
5294 }
5295 }
5296 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5297 }
5298 break;
5299
5300 /* Set the bottom bit of DT_INIT/FINI if the
5301 corresponding function is Thumb. */
5302 case DT_INIT:
5303 name = info->init_function;
5304 goto get_sym;
5305 case DT_FINI:
5306 name = info->fini_function;
5307 get_sym:
5308 /* If it wasn't set by elf_bfd_final_link
5309 then there is nothing to adjust. */
5310 if (dyn.d_un.d_val != 0)
5311 {
5312 struct elf_link_hash_entry * eh;
5313
5314 eh = elf_link_hash_lookup (elf_hash_table (info), name,
5315 FALSE, FALSE, TRUE);
5316 if (eh != (struct elf_link_hash_entry *) NULL
5317 && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC)
5318 {
5319 dyn.d_un.d_val |= 1;
5320 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5321 }
5322 }
5323 break;
5324 }
5325 }
5326
5327 /* Fill in the first entry in the procedure linkage table. */
5328 if (splt->size > 0 && elf32_arm_hash_table (info)->plt_header_size)
5329 {
5330 bfd_vma got_displacement;
5331
5332 /* Calculate the displacement between the PLT slot and &GOT[0]. */
5333 got_displacement = (sgot->output_section->vma
5334 + sgot->output_offset
5335 - splt->output_section->vma
5336 - splt->output_offset
5337 - 16);
5338
5339 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[0], splt->contents + 0);
5340 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[1], splt->contents + 4);
5341 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[2], splt->contents + 8);
5342 bfd_put_32 (output_bfd, elf32_arm_plt0_entry[3], splt->contents + 12);
5343 #ifdef FOUR_WORD_PLT
5344 /* The displacement value goes in the otherwise-unused last word of
5345 the second entry. */
5346 bfd_put_32 (output_bfd, got_displacement, splt->contents + 28);
5347 #else
5348 bfd_put_32 (output_bfd, got_displacement, splt->contents + 16);
5349 #endif
5350 }
5351
5352 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5353 really seem like the right value. */
5354 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
5355 }
5356
5357 /* Fill in the first three entries in the global offset table. */
5358 if (sgot)
5359 {
5360 if (sgot->size > 0)
5361 {
5362 if (sdyn == NULL)
5363 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
5364 else
5365 bfd_put_32 (output_bfd,
5366 sdyn->output_section->vma + sdyn->output_offset,
5367 sgot->contents);
5368 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
5369 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
5370 }
5371
5372 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
5373 }
5374
5375 return TRUE;
5376 }
5377
5378 static void
5379 elf32_arm_post_process_headers (bfd * abfd, struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
5380 {
5381 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
5382 struct elf32_arm_link_hash_table *globals;
5383
5384 i_ehdrp = elf_elfheader (abfd);
5385
5386 if (EF_ARM_EABI_VERSION (i_ehdrp->e_flags) == EF_ARM_EABI_UNKNOWN)
5387 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_ARM;
5388 else
5389 i_ehdrp->e_ident[EI_OSABI] = 0;
5390 i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION;
5391
5392 if (link_info)
5393 {
5394 globals = elf32_arm_hash_table (link_info);
5395 if (globals->byteswap_code)
5396 i_ehdrp->e_flags |= EF_ARM_BE8;
5397 }
5398 }
5399
5400 static enum elf_reloc_type_class
5401 elf32_arm_reloc_type_class (const Elf_Internal_Rela *rela)
5402 {
5403 switch ((int) ELF32_R_TYPE (rela->r_info))
5404 {
5405 case R_ARM_RELATIVE:
5406 return reloc_class_relative;
5407 case R_ARM_JUMP_SLOT:
5408 return reloc_class_plt;
5409 case R_ARM_COPY:
5410 return reloc_class_copy;
5411 default:
5412 return reloc_class_normal;
5413 }
5414 }
5415
5416 /* Set the right machine number for an Arm ELF file. */
5417
5418 static bfd_boolean
5419 elf32_arm_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr)
5420 {
5421 if (hdr->sh_type == SHT_NOTE)
5422 *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS;
5423
5424 return TRUE;
5425 }
5426
5427 static void
5428 elf32_arm_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED)
5429 {
5430 bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
5431 }
5432
5433 /* Return TRUE if this is an unwinding table entry. */
5434
5435 static bfd_boolean
5436 is_arm_elf_unwind_section_name (bfd * abfd ATTRIBUTE_UNUSED, const char * name)
5437 {
5438 size_t len1, len2;
5439
5440 len1 = sizeof (ELF_STRING_ARM_unwind) - 1;
5441 len2 = sizeof (ELF_STRING_ARM_unwind_once) - 1;
5442 return (strncmp (name, ELF_STRING_ARM_unwind, len1) == 0
5443 || strncmp (name, ELF_STRING_ARM_unwind_once, len2) == 0);
5444 }
5445
5446
5447 /* Set the type and flags for an ARM section. We do this by
5448 the section name, which is a hack, but ought to work. */
5449
5450 static bfd_boolean
5451 elf32_arm_fake_sections (bfd * abfd, Elf_Internal_Shdr * hdr, asection * sec)
5452 {
5453 const char * name;
5454
5455 name = bfd_get_section_name (abfd, sec);
5456
5457 if (is_arm_elf_unwind_section_name (abfd, name))
5458 {
5459 hdr->sh_type = SHT_ARM_EXIDX;
5460 hdr->sh_flags |= SHF_LINK_ORDER;
5461 }
5462 return TRUE;
5463 }
5464
5465 /* Handle an ARM specific section when reading an object file.
5466 This is called when elf.c finds a section with an unknown type. */
5467
5468 static bfd_boolean
5469 elf32_arm_section_from_shdr (bfd *abfd,
5470 Elf_Internal_Shdr * hdr,
5471 const char *name)
5472 {
5473 /* There ought to be a place to keep ELF backend specific flags, but
5474 at the moment there isn't one. We just keep track of the
5475 sections by their name, instead. Fortunately, the ABI gives
5476 names for all the ARM specific sections, so we will probably get
5477 away with this. */
5478 switch (hdr->sh_type)
5479 {
5480 case SHT_ARM_EXIDX:
5481 break;
5482
5483 default:
5484 return FALSE;
5485 }
5486
5487 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
5488 return FALSE;
5489
5490 return TRUE;
5491 }
5492
5493 /* Called for each symbol. Builds a section map based on mapping symbols.
5494 Does not alter any of the symbols. */
5495
5496 static bfd_boolean
5497 elf32_arm_output_symbol_hook (struct bfd_link_info *info,
5498 const char *name,
5499 Elf_Internal_Sym *elfsym,
5500 asection *input_sec,
5501 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
5502 {
5503 int mapcount;
5504 elf32_arm_section_map *map;
5505 struct elf32_arm_link_hash_table *globals;
5506
5507 /* Only do this on final link. */
5508 if (info->relocatable)
5509 return TRUE;
5510
5511 /* Only build a map if we need to byteswap code. */
5512 globals = elf32_arm_hash_table (info);
5513 if (!globals->byteswap_code)
5514 return TRUE;
5515
5516 /* We only want mapping symbols. */
5517 if (! is_arm_mapping_symbol_name (name))
5518 return TRUE;
5519
5520 mapcount = ++(elf32_arm_section_data (input_sec)->mapcount);
5521 map = elf32_arm_section_data (input_sec)->map;
5522 /* TODO: This may be inefficient, but we probably don't usually have many
5523 mapping symbols per section. */
5524 map = bfd_realloc (map, mapcount * sizeof (elf32_arm_section_map));
5525 elf32_arm_section_data (input_sec)->map = map;
5526
5527 map[mapcount - 1].vma = elfsym->st_value;
5528 map[mapcount - 1].type = name[1];
5529 return TRUE;
5530 }
5531
5532
5533 /* Allocate target specific section data. */
5534
5535 static bfd_boolean
5536 elf32_arm_new_section_hook (bfd *abfd, asection *sec)
5537 {
5538 struct _arm_elf_section_data *sdata;
5539 bfd_size_type amt = sizeof (*sdata);
5540
5541 sdata = bfd_zalloc (abfd, amt);
5542 if (sdata == NULL)
5543 return FALSE;
5544 sec->used_by_bfd = sdata;
5545
5546 return _bfd_elf_new_section_hook (abfd, sec);
5547 }
5548
5549
5550 /* Used to order a list of mapping symbols by address. */
5551
5552 static int
5553 elf32_arm_compare_mapping (const void * a, const void * b)
5554 {
5555 return ((const elf32_arm_section_map *) a)->vma
5556 > ((const elf32_arm_section_map *) b)->vma;
5557 }
5558
5559
5560 /* Do code byteswapping. Return FALSE afterwards so that the section is
5561 written out as normal. */
5562
5563 static bfd_boolean
5564 elf32_arm_write_section (bfd *output_bfd ATTRIBUTE_UNUSED, asection *sec,
5565 bfd_byte *contents)
5566 {
5567 int mapcount;
5568 elf32_arm_section_map *map;
5569 bfd_vma ptr;
5570 bfd_vma end;
5571 bfd_vma offset;
5572 bfd_byte tmp;
5573 int i;
5574
5575 mapcount = elf32_arm_section_data (sec)->mapcount;
5576 map = elf32_arm_section_data (sec)->map;
5577
5578 if (mapcount == 0)
5579 return FALSE;
5580
5581 qsort (map, mapcount, sizeof (elf32_arm_section_map),
5582 elf32_arm_compare_mapping);
5583
5584 offset = sec->output_section->vma + sec->output_offset;
5585 ptr = map[0].vma - offset;
5586 for (i = 0; i < mapcount; i++)
5587 {
5588 if (i == mapcount - 1)
5589 end = sec->size;
5590 else
5591 end = map[i + 1].vma - offset;
5592
5593 switch (map[i].type)
5594 {
5595 case 'a':
5596 /* Byte swap code words. */
5597 while (ptr + 3 < end)
5598 {
5599 tmp = contents[ptr];
5600 contents[ptr] = contents[ptr + 3];
5601 contents[ptr + 3] = tmp;
5602 tmp = contents[ptr + 1];
5603 contents[ptr + 1] = contents[ptr + 2];
5604 contents[ptr + 2] = tmp;
5605 ptr += 4;
5606 }
5607 break;
5608
5609 case 't':
5610 /* Byte swap code halfwords. */
5611 while (ptr + 1 < end)
5612 {
5613 tmp = contents[ptr];
5614 contents[ptr] = contents[ptr + 1];
5615 contents[ptr + 1] = tmp;
5616 ptr += 2;
5617 }
5618 break;
5619
5620 case 'd':
5621 /* Leave data alone. */
5622 break;
5623 }
5624 ptr = end;
5625 }
5626 free (map);
5627 return FALSE;
5628 }
5629
5630 /* Display STT_ARM_TFUNC symbols as functions. */
5631
5632 static void
5633 elf32_arm_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
5634 asymbol *asym)
5635 {
5636 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
5637
5638 if (ELF_ST_TYPE (elfsym->internal_elf_sym.st_info) == STT_ARM_TFUNC)
5639 elfsym->symbol.flags |= BSF_FUNCTION;
5640 }
5641
5642
5643 /* Mangle thumb function symbols as we read them in. */
5644
5645 static void
5646 elf32_arm_swap_symbol_in (bfd * abfd,
5647 const void *psrc,
5648 const void *pshn,
5649 Elf_Internal_Sym *dst)
5650 {
5651 bfd_elf32_swap_symbol_in (abfd, psrc, pshn, dst);
5652
5653 /* New EABI objects mark thumb function symbols by setting the low bit of
5654 the address. Turn these into STT_ARM_TFUNC. */
5655 if (ELF_ST_TYPE (dst->st_info) == STT_FUNC
5656 && (dst->st_value & 1))
5657 {
5658 dst->st_info = ELF_ST_INFO (ELF_ST_BIND (dst->st_info), STT_ARM_TFUNC);
5659 dst->st_value &= ~(bfd_vma) 1;
5660 }
5661 }
5662
5663
5664 /* Mangle thumb function symbols as we write them out. */
5665
5666 static void
5667 elf32_arm_swap_symbol_out (bfd *abfd,
5668 const Elf_Internal_Sym *src,
5669 void *cdst,
5670 void *shndx)
5671 {
5672 Elf_Internal_Sym newsym;
5673
5674 /* We convert STT_ARM_TFUNC symbols into STT_FUNC with the low bit
5675 of the address set, as per the new EABI. We do this unconditionally
5676 because objcopy does not set the elf header flags until after
5677 it writes out the symbol table. */
5678 if (ELF_ST_TYPE (src->st_info) == STT_ARM_TFUNC)
5679 {
5680 newsym = *src;
5681 newsym.st_info = ELF_ST_INFO (ELF_ST_BIND (src->st_info), STT_FUNC);
5682 newsym.st_value |= 1;
5683
5684 src = &newsym;
5685 }
5686 bfd_elf32_swap_symbol_out (abfd, src, cdst, shndx);
5687 }
5688
5689 /* We use this to override swap_symbol_in and swap_symbol_out. */
5690 const struct elf_size_info elf32_arm_size_info = {
5691 sizeof (Elf32_External_Ehdr),
5692 sizeof (Elf32_External_Phdr),
5693 sizeof (Elf32_External_Shdr),
5694 sizeof (Elf32_External_Rel),
5695 sizeof (Elf32_External_Rela),
5696 sizeof (Elf32_External_Sym),
5697 sizeof (Elf32_External_Dyn),
5698 sizeof (Elf_External_Note),
5699 4,
5700 1,
5701 32, 2,
5702 ELFCLASS32, EV_CURRENT,
5703 bfd_elf32_write_out_phdrs,
5704 bfd_elf32_write_shdrs_and_ehdr,
5705 bfd_elf32_write_relocs,
5706 elf32_arm_swap_symbol_in,
5707 elf32_arm_swap_symbol_out,
5708 bfd_elf32_slurp_reloc_table,
5709 bfd_elf32_slurp_symbol_table,
5710 bfd_elf32_swap_dyn_in,
5711 bfd_elf32_swap_dyn_out,
5712 bfd_elf32_swap_reloc_in,
5713 bfd_elf32_swap_reloc_out,
5714 bfd_elf32_swap_reloca_in,
5715 bfd_elf32_swap_reloca_out
5716 };
5717
5718 #define ELF_ARCH bfd_arch_arm
5719 #define ELF_MACHINE_CODE EM_ARM
5720 #ifdef __QNXTARGET__
5721 #define ELF_MAXPAGESIZE 0x1000
5722 #else
5723 #define ELF_MAXPAGESIZE 0x8000
5724 #endif
5725 #define ELF_MINPAGESIZE 0x1000
5726
5727 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
5728 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
5729 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
5730 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
5731 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
5732 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
5733 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
5734 #define bfd_elf32_new_section_hook elf32_arm_new_section_hook
5735 #define bfd_elf32_bfd_is_target_special_symbol elf32_arm_is_target_special_symbol
5736
5737 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type
5738 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
5739 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
5740 #define elf_backend_check_relocs elf32_arm_check_relocs
5741 #define elf_backend_relocate_section elf32_arm_relocate_section
5742 #define elf_backend_write_section elf32_arm_write_section
5743 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
5744 #define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections
5745 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
5746 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
5747 #define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook
5748 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
5749 #define elf_backend_post_process_headers elf32_arm_post_process_headers
5750 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class
5751 #define elf_backend_object_p elf32_arm_object_p
5752 #define elf_backend_section_flags elf32_arm_section_flags
5753 #define elf_backend_fake_sections elf32_arm_fake_sections
5754 #define elf_backend_section_from_shdr elf32_arm_section_from_shdr
5755 #define elf_backend_final_write_processing elf32_arm_final_write_processing
5756 #define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol
5757 #define elf_backend_symbol_processing elf32_arm_symbol_processing
5758 #define elf_backend_size_info elf32_arm_size_info
5759
5760 #define elf_backend_can_refcount 1
5761 #define elf_backend_can_gc_sections 1
5762 #define elf_backend_plt_readonly 1
5763 #define elf_backend_want_got_plt 1
5764 #define elf_backend_want_plt_sym 0
5765 #define elf_backend_may_use_rel_p 1
5766 #define elf_backend_may_use_rela_p 0
5767 #define elf_backend_default_use_rela_p 0
5768 #define elf_backend_rela_normal 0
5769
5770 #define elf_backend_got_header_size 12
5771
5772 #include "elf32-target.h"
5773
5774 /* VxWorks Targets */
5775
5776 #undef TARGET_LITTLE_SYM
5777 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_vxworks_vec
5778 #undef TARGET_LITTLE_NAME
5779 #define TARGET_LITTLE_NAME "elf32-littlearm-vxworks"
5780 #undef TARGET_BIG_SYM
5781 #define TARGET_BIG_SYM bfd_elf32_bigarm_vxworks_vec
5782 #undef TARGET_BIG_NAME
5783 #define TARGET_BIG_NAME "elf32-bigarm-vxworks"
5784
5785 /* Like elf32_arm_link_hash_table_create -- but overrides
5786 appropriately for VxWorks. */
5787 static struct bfd_link_hash_table *
5788 elf32_arm_vxworks_link_hash_table_create (bfd *abfd)
5789 {
5790 struct bfd_link_hash_table *ret;
5791
5792 ret = elf32_arm_link_hash_table_create (abfd);
5793 if (ret)
5794 {
5795 struct elf32_arm_link_hash_table *htab
5796 = (struct elf32_arm_link_hash_table *)ret;
5797 htab->use_rel = 0;
5798 }
5799 return ret;
5800 }
5801
5802 #undef elf32_bed
5803 #define elf32_bed elf32_arm_vxworks_bed
5804
5805 #undef bfd_elf32_bfd_link_hash_table_create
5806 #define bfd_elf32_bfd_link_hash_table_create \
5807 elf32_arm_vxworks_link_hash_table_create
5808
5809 #undef elf_backend_may_use_rel_p
5810 #define elf_backend_may_use_rel_p 0
5811 #undef elf_backend_may_use_rela_p
5812 #define elf_backend_may_use_rela_p 1
5813 #undef elf_backend_default_use_rela_p
5814 #define elf_backend_default_use_rela_p 1
5815 #undef elf_backend_rela_normal
5816 #define elf_backend_rela_normal 1
5817
5818 #include "elf32-target.h"
5819
5820
5821 /* Symbian OS Targets */
5822
5823 #undef TARGET_LITTLE_SYM
5824 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_symbian_vec
5825 #undef TARGET_LITTLE_NAME
5826 #define TARGET_LITTLE_NAME "elf32-littlearm-symbian"
5827 #undef TARGET_BIG_SYM
5828 #define TARGET_BIG_SYM bfd_elf32_bigarm_symbian_vec
5829 #undef TARGET_BIG_NAME
5830 #define TARGET_BIG_NAME "elf32-bigarm-symbian"
5831
5832 /* Like elf32_arm_link_hash_table_create -- but overrides
5833 appropriately for Symbian OS. */
5834 static struct bfd_link_hash_table *
5835 elf32_arm_symbian_link_hash_table_create (bfd *abfd)
5836 {
5837 struct bfd_link_hash_table *ret;
5838
5839 ret = elf32_arm_link_hash_table_create (abfd);
5840 if (ret)
5841 {
5842 struct elf32_arm_link_hash_table *htab
5843 = (struct elf32_arm_link_hash_table *)ret;
5844 /* There is no PLT header for Symbian OS. */
5845 htab->plt_header_size = 0;
5846 /* The PLT entries are each three instructions. */
5847 htab->plt_entry_size = 4 * NUM_ELEM (elf32_arm_symbian_plt_entry);
5848 htab->symbian_p = 1;
5849 }
5850 return ret;
5851 }
5852
5853 static struct bfd_elf_special_section const
5854 elf32_arm_symbian_special_sections[]=
5855 {
5856 /* In a BPABI executable, the dynamic linking sections do not go in
5857 the loadable read-only segment. The post-linker may wish to
5858 refer to these sections, but they are not part of the final
5859 program image. */
5860 { ".dynamic", 8, 0, SHT_DYNAMIC, 0 },
5861 { ".dynstr", 7, 0, SHT_STRTAB, 0 },
5862 { ".dynsym", 7, 0, SHT_DYNSYM, 0 },
5863 { ".got", 4, 0, SHT_PROGBITS, 0 },
5864 { ".hash", 5, 0, SHT_HASH, 0 },
5865 /* These sections do not need to be writable as the SymbianOS
5866 postlinker will arrange things so that no dynamic relocation is
5867 required. */
5868 { ".init_array", 11, 0, SHT_INIT_ARRAY, SHF_ALLOC },
5869 { ".fini_array", 11, 0, SHT_FINI_ARRAY, SHF_ALLOC },
5870 { ".preinit_array", 14, 0, SHT_PREINIT_ARRAY, SHF_ALLOC },
5871 { NULL, 0, 0, 0, 0 }
5872 };
5873
5874 static void
5875 elf32_arm_symbian_begin_write_processing (bfd *abfd,
5876 struct bfd_link_info *link_info
5877 ATTRIBUTE_UNUSED)
5878 {
5879 /* BPABI objects are never loaded directly by an OS kernel; they are
5880 processed by a postlinker first, into an OS-specific format. If
5881 the D_PAGED bit is set on the file, BFD will align segments on
5882 page boundaries, so that an OS can directly map the file. With
5883 BPABI objects, that just results in wasted space. In addition,
5884 because we clear the D_PAGED bit, map_sections_to_segments will
5885 recognize that the program headers should not be mapped into any
5886 loadable segment. */
5887 abfd->flags &= ~D_PAGED;
5888 }
5889
5890 static bfd_boolean
5891 elf32_arm_symbian_modify_segment_map (bfd *abfd,
5892 struct bfd_link_info *info
5893 ATTRIBUTE_UNUSED)
5894 {
5895 struct elf_segment_map *m;
5896 asection *dynsec;
5897
5898 /* BPABI shared libraries and executables should have a PT_DYNAMIC
5899 segment. However, because the .dynamic section is not marked
5900 with SEC_LOAD, the generic ELF code will not create such a
5901 segment. */
5902 dynsec = bfd_get_section_by_name (abfd, ".dynamic");
5903 if (dynsec)
5904 {
5905 m = _bfd_elf_make_dynamic_segment (abfd, dynsec);
5906 m->next = elf_tdata (abfd)->segment_map;
5907 elf_tdata (abfd)->segment_map = m;
5908 }
5909
5910 return TRUE;
5911 }
5912
5913 #undef elf32_bed
5914 #define elf32_bed elf32_arm_symbian_bed
5915
5916 /* The dynamic sections are not allocated on SymbianOS; the postlinker
5917 will process them and then discard them. */
5918 #undef ELF_DYNAMIC_SEC_FLAGS
5919 #define ELF_DYNAMIC_SEC_FLAGS \
5920 (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED)
5921
5922 #undef bfd_elf32_bfd_link_hash_table_create
5923 #define bfd_elf32_bfd_link_hash_table_create \
5924 elf32_arm_symbian_link_hash_table_create
5925
5926 #undef elf_backend_special_sections
5927 #define elf_backend_special_sections elf32_arm_symbian_special_sections
5928
5929 #undef elf_backend_begin_write_processing
5930 #define elf_backend_begin_write_processing \
5931 elf32_arm_symbian_begin_write_processing
5932
5933 #undef elf_backend_modify_segment_map
5934 #define elf_backend_modify_segment_map elf32_arm_symbian_modify_segment_map
5935
5936 /* There is no .got section for BPABI objects, and hence no header. */
5937 #undef elf_backend_got_header_size
5938 #define elf_backend_got_header_size 0
5939
5940 /* Similarly, there is no .got.plt section. */
5941 #undef elf_backend_want_got_plt
5942 #define elf_backend_want_got_plt 0
5943
5944 #undef elf_backend_may_use_rel_p
5945 #define elf_backend_may_use_rel_p 1
5946 #undef elf_backend_may_use_rela_p
5947 #define elf_backend_may_use_rela_p 0
5948 #undef elf_backend_default_use_rela_p
5949 #define elf_backend_default_use_rela_p 0
5950 #undef elf_backend_rela_normal
5951 #define elf_backend_rela_normal 0
5952
5953 #include "elf32-target.h"
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