?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
file as.info-5 was initially added on branch binutils-2_10-branch.
[binutils.git] / bfd / elf32-ppc.c
blob6dc3effc3f14e4a47e5711b6e31e1f476432b522
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Cygnus Support.
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 /* This file is based on a preliminary PowerPC ELF ABI. The
22 information may not match the final PowerPC ELF ABI. It includes
23 suggestions from the in-progress Embedded PowerPC ABI, and that
24 information may also not match. */
25
26 #include "bfd.h"
27 #include "sysdep.h"
28 #include "bfdlink.h"
29 #include "libbfd.h"
30 #include "elf-bfd.h"
31 #include "elf/ppc.h"
32
33 #define USE_RELA /* we want RELA relocations, not REL */
34
35
36 static reloc_howto_type *ppc_elf_reloc_type_lookup
37 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
38 static void ppc_elf_info_to_howto
39 PARAMS ((bfd *abfd, arelent *cache_ptr, Elf32_Internal_Rela *dst));
40 static void ppc_elf_howto_init PARAMS ((void));
41 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
42 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
43 static boolean ppc_elf_set_private_flags PARAMS ((bfd *, flagword));
44 static boolean ppc_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *));
45 static boolean ppc_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
46
47 static int ppc_elf_additional_program_headers PARAMS ((bfd *));
48 static boolean ppc_elf_modify_segment_map PARAMS ((bfd *));
49
50 static boolean ppc_elf_create_dynamic_sections
51 PARAMS ((bfd *, struct bfd_link_info *));
52
53 static boolean ppc_elf_section_from_shdr PARAMS ((bfd *,
54 Elf32_Internal_Shdr *,
55 char *));
56 static boolean ppc_elf_fake_sections
57 PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *));
58
59 static elf_linker_section_t *ppc_elf_create_linker_section
60 PARAMS ((bfd *abfd,
61 struct bfd_link_info *info,
62 enum elf_linker_section_enum));
63
64 static boolean ppc_elf_check_relocs PARAMS ((bfd *,
65 struct bfd_link_info *,
66 asection *,
67 const Elf_Internal_Rela *));
68
69 static asection * ppc_elf_gc_mark_hook PARAMS ((bfd *abfd,
70 struct bfd_link_info *info,
71 Elf_Internal_Rela *rel,
72 struct elf_link_hash_entry *h,
73 Elf_Internal_Sym *sym));
74
75 static boolean ppc_elf_gc_sweep_hook PARAMS ((bfd *abfd,
76 struct bfd_link_info *info,
77 asection *sec,
78 const Elf_Internal_Rela *relocs));
79
80 static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *,
81 struct elf_link_hash_entry *));
82
83 static boolean ppc_elf_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
84
85 static boolean ppc_elf_relocate_section PARAMS ((bfd *,
86 struct bfd_link_info *info,
87 bfd *,
88 asection *,
89 bfd_byte *,
90 Elf_Internal_Rela *relocs,
91 Elf_Internal_Sym *local_syms,
92 asection **));
93
94 static boolean ppc_elf_add_symbol_hook PARAMS ((bfd *,
95 struct bfd_link_info *,
96 const Elf_Internal_Sym *,
97 const char **,
98 flagword *,
99 asection **,
100 bfd_vma *));
101
102 static boolean ppc_elf_finish_dynamic_symbol PARAMS ((bfd *,
103 struct bfd_link_info *,
104 struct elf_link_hash_entry *,
105 Elf_Internal_Sym *));
106
107 static boolean ppc_elf_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
108
109 #define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */
110 #define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */
111 #define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */
112
113 /* The name of the dynamic interpreter. This is put in the .interp
114 section. */
115
116 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
117
118 /* The size in bytes of an entry in the procedure linkage table. */
119 #define PLT_ENTRY_SIZE 12
120 /* The initial size of the plt reserved for the dynamic linker. */
121 #define PLT_INITIAL_ENTRY_SIZE 72
122 /* The size of the gap between entries in the PLT. */
123 #define PLT_SLOT_SIZE 8
124 /* The number of single-slot PLT entries (the rest use two slots). */
125 #define PLT_NUM_SINGLE_ENTRIES 8192
126
127 \f
128 static reloc_howto_type *ppc_elf_howto_table[ (int)R_PPC_max ];
129
130 static reloc_howto_type ppc_elf_howto_raw[] =
131 {
132 /* This reloc does nothing. */
133 HOWTO (R_PPC_NONE, /* type */
134 0, /* rightshift */
135 2, /* size (0 = byte, 1 = short, 2 = long) */
136 32, /* bitsize */
137 false, /* pc_relative */
138 0, /* bitpos */
139 complain_overflow_bitfield, /* complain_on_overflow */
140 bfd_elf_generic_reloc, /* special_function */
141 "R_PPC_NONE", /* name */
142 false, /* partial_inplace */
143 0, /* src_mask */
144 0, /* dst_mask */
145 false), /* pcrel_offset */
146
147 /* A standard 32 bit relocation. */
148 HOWTO (R_PPC_ADDR32, /* type */
149 0, /* rightshift */
150 2, /* size (0 = byte, 1 = short, 2 = long) */
151 32, /* bitsize */
152 false, /* pc_relative */
153 0, /* bitpos */
154 complain_overflow_bitfield, /* complain_on_overflow */
155 bfd_elf_generic_reloc, /* special_function */
156 "R_PPC_ADDR32", /* name */
157 false, /* partial_inplace */
158 0, /* src_mask */
159 0xffffffff, /* dst_mask */
160 false), /* pcrel_offset */
161
162 /* An absolute 26 bit branch; the lower two bits must be zero.
163 FIXME: we don't check that, we just clear them. */
164 HOWTO (R_PPC_ADDR24, /* type */
165 0, /* rightshift */
166 2, /* size (0 = byte, 1 = short, 2 = long) */
167 26, /* bitsize */
168 false, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_bitfield, /* complain_on_overflow */
171 bfd_elf_generic_reloc, /* special_function */
172 "R_PPC_ADDR24", /* name */
173 false, /* partial_inplace */
174 0, /* src_mask */
175 0x3fffffc, /* dst_mask */
176 false), /* pcrel_offset */
177
178 /* A standard 16 bit relocation. */
179 HOWTO (R_PPC_ADDR16, /* type */
180 0, /* rightshift */
181 1, /* size (0 = byte, 1 = short, 2 = long) */
182 16, /* bitsize */
183 false, /* pc_relative */
184 0, /* bitpos */
185 complain_overflow_bitfield, /* complain_on_overflow */
186 bfd_elf_generic_reloc, /* special_function */
187 "R_PPC_ADDR16", /* name */
188 false, /* partial_inplace */
189 0, /* src_mask */
190 0xffff, /* dst_mask */
191 false), /* pcrel_offset */
192
193 /* A 16 bit relocation without overflow. */
194 HOWTO (R_PPC_ADDR16_LO, /* type */
195 0, /* rightshift */
196 1, /* size (0 = byte, 1 = short, 2 = long) */
197 16, /* bitsize */
198 false, /* pc_relative */
199 0, /* bitpos */
200 complain_overflow_dont,/* complain_on_overflow */
201 bfd_elf_generic_reloc, /* special_function */
202 "R_PPC_ADDR16_LO", /* name */
203 false, /* partial_inplace */
204 0, /* src_mask */
205 0xffff, /* dst_mask */
206 false), /* pcrel_offset */
207
208 /* The high order 16 bits of an address. */
209 HOWTO (R_PPC_ADDR16_HI, /* type */
210 16, /* rightshift */
211 1, /* size (0 = byte, 1 = short, 2 = long) */
212 16, /* bitsize */
213 false, /* pc_relative */
214 0, /* bitpos */
215 complain_overflow_dont, /* complain_on_overflow */
216 bfd_elf_generic_reloc, /* special_function */
217 "R_PPC_ADDR16_HI", /* name */
218 false, /* partial_inplace */
219 0, /* src_mask */
220 0xffff, /* dst_mask */
221 false), /* pcrel_offset */
222
223 /* The high order 16 bits of an address, plus 1 if the contents of
224 the low 16 bits, treated as a signed number, is negative. */
225 HOWTO (R_PPC_ADDR16_HA, /* type */
226 16, /* rightshift */
227 1, /* size (0 = byte, 1 = short, 2 = long) */
228 16, /* bitsize */
229 false, /* pc_relative */
230 0, /* bitpos */
231 complain_overflow_dont, /* complain_on_overflow */
232 ppc_elf_addr16_ha_reloc, /* special_function */
233 "R_PPC_ADDR16_HA", /* name */
234 false, /* partial_inplace */
235 0, /* src_mask */
236 0xffff, /* dst_mask */
237 false), /* pcrel_offset */
238
239 /* An absolute 16 bit branch; the lower two bits must be zero.
240 FIXME: we don't check that, we just clear them. */
241 HOWTO (R_PPC_ADDR14, /* type */
242 0, /* rightshift */
243 2, /* size (0 = byte, 1 = short, 2 = long) */
244 16, /* bitsize */
245 false, /* pc_relative */
246 0, /* bitpos */
247 complain_overflow_bitfield, /* complain_on_overflow */
248 bfd_elf_generic_reloc, /* special_function */
249 "R_PPC_ADDR14", /* name */
250 false, /* partial_inplace */
251 0, /* src_mask */
252 0xfffc, /* dst_mask */
253 false), /* pcrel_offset */
254
255 /* An absolute 16 bit branch, for which bit 10 should be set to
256 indicate that the branch is expected to be taken. The lower two
257 bits must be zero. */
258 HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */
259 0, /* rightshift */
260 2, /* size (0 = byte, 1 = short, 2 = long) */
261 16, /* bitsize */
262 false, /* pc_relative */
263 0, /* bitpos */
264 complain_overflow_bitfield, /* complain_on_overflow */
265 bfd_elf_generic_reloc, /* special_function */
266 "R_PPC_ADDR14_BRTAKEN",/* name */
267 false, /* partial_inplace */
268 0, /* src_mask */
269 0xfffc, /* dst_mask */
270 false), /* pcrel_offset */
271
272 /* An absolute 16 bit branch, for which bit 10 should be set to
273 indicate that the branch is not expected to be taken. The lower
274 two bits must be zero. */
275 HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */
276 0, /* rightshift */
277 2, /* size (0 = byte, 1 = short, 2 = long) */
278 16, /* bitsize */
279 false, /* pc_relative */
280 0, /* bitpos */
281 complain_overflow_bitfield, /* complain_on_overflow */
282 bfd_elf_generic_reloc, /* special_function */
283 "R_PPC_ADDR14_BRNTAKEN",/* name */
284 false, /* partial_inplace */
285 0, /* src_mask */
286 0xfffc, /* dst_mask */
287 false), /* pcrel_offset */
288
289 /* A relative 26 bit branch; the lower two bits must be zero. */
290 HOWTO (R_PPC_REL24, /* type */
291 0, /* rightshift */
292 2, /* size (0 = byte, 1 = short, 2 = long) */
293 26, /* bitsize */
294 true, /* pc_relative */
295 0, /* bitpos */
296 complain_overflow_signed, /* complain_on_overflow */
297 bfd_elf_generic_reloc, /* special_function */
298 "R_PPC_REL24", /* name */
299 false, /* partial_inplace */
300 0, /* src_mask */
301 0x3fffffc, /* dst_mask */
302 true), /* pcrel_offset */
303
304 /* A relative 16 bit branch; the lower two bits must be zero. */
305 HOWTO (R_PPC_REL14, /* type */
306 0, /* rightshift */
307 2, /* size (0 = byte, 1 = short, 2 = long) */
308 16, /* bitsize */
309 true, /* pc_relative */
310 0, /* bitpos */
311 complain_overflow_signed, /* complain_on_overflow */
312 bfd_elf_generic_reloc, /* special_function */
313 "R_PPC_REL14", /* name */
314 false, /* partial_inplace */
315 0, /* src_mask */
316 0xfffc, /* dst_mask */
317 true), /* pcrel_offset */
318
319 /* A relative 16 bit branch. Bit 10 should be set to indicate that
320 the branch is expected to be taken. The lower two bits must be
321 zero. */
322 HOWTO (R_PPC_REL14_BRTAKEN, /* type */
323 0, /* rightshift */
324 2, /* size (0 = byte, 1 = short, 2 = long) */
325 16, /* bitsize */
326 true, /* pc_relative */
327 0, /* bitpos */
328 complain_overflow_signed, /* complain_on_overflow */
329 bfd_elf_generic_reloc, /* special_function */
330 "R_PPC_REL14_BRTAKEN", /* name */
331 false, /* partial_inplace */
332 0, /* src_mask */
333 0xfffc, /* dst_mask */
334 true), /* pcrel_offset */
335
336 /* A relative 16 bit branch. Bit 10 should be set to indicate that
337 the branch is not expected to be taken. The lower two bits must
338 be zero. */
339 HOWTO (R_PPC_REL14_BRNTAKEN, /* type */
340 0, /* rightshift */
341 2, /* size (0 = byte, 1 = short, 2 = long) */
342 16, /* bitsize */
343 true, /* pc_relative */
344 0, /* bitpos */
345 complain_overflow_signed, /* complain_on_overflow */
346 bfd_elf_generic_reloc, /* special_function */
347 "R_PPC_REL14_BRNTAKEN",/* name */
348 false, /* partial_inplace */
349 0, /* src_mask */
350 0xfffc, /* dst_mask */
351 true), /* pcrel_offset */
352
353 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
354 symbol. */
355 HOWTO (R_PPC_GOT16, /* type */
356 0, /* rightshift */
357 1, /* size (0 = byte, 1 = short, 2 = long) */
358 16, /* bitsize */
359 false, /* pc_relative */
360 0, /* bitpos */
361 complain_overflow_signed, /* complain_on_overflow */
362 bfd_elf_generic_reloc, /* special_function */
363 "R_PPC_GOT16", /* name */
364 false, /* partial_inplace */
365 0, /* src_mask */
366 0xffff, /* dst_mask */
367 false), /* pcrel_offset */
368
369 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
370 the symbol. */
371 HOWTO (R_PPC_GOT16_LO, /* type */
372 0, /* rightshift */
373 1, /* size (0 = byte, 1 = short, 2 = long) */
374 16, /* bitsize */
375 false, /* pc_relative */
376 0, /* bitpos */
377 complain_overflow_dont, /* complain_on_overflow */
378 bfd_elf_generic_reloc, /* special_function */
379 "R_PPC_GOT16_LO", /* name */
380 false, /* partial_inplace */
381 0, /* src_mask */
382 0xffff, /* dst_mask */
383 false), /* pcrel_offset */
384
385 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
386 the symbol. */
387 HOWTO (R_PPC_GOT16_HI, /* type */
388 16, /* rightshift */
389 1, /* size (0 = byte, 1 = short, 2 = long) */
390 16, /* bitsize */
391 false, /* pc_relative */
392 0, /* bitpos */
393 complain_overflow_bitfield, /* complain_on_overflow */
394 bfd_elf_generic_reloc, /* special_function */
395 "R_PPC_GOT16_HI", /* name */
396 false, /* partial_inplace */
397 0, /* src_mask */
398 0xffff, /* dst_mask */
399 false), /* pcrel_offset */
400
401 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
402 the symbol. */
403 HOWTO (R_PPC_GOT16_HA, /* type */
404 16, /* rightshift */
405 1, /* size (0 = byte, 1 = short, 2 = long) */
406 16, /* bitsize */
407 false, /* pc_relative */
408 0, /* bitpos */
409 complain_overflow_bitfield, /* complain_on_overflow */
410 ppc_elf_addr16_ha_reloc, /* special_function */
411 "R_PPC_GOT16_HA", /* name */
412 false, /* partial_inplace */
413 0, /* src_mask */
414 0xffff, /* dst_mask */
415 false), /* pcrel_offset */
416
417 /* Like R_PPC_REL24, but referring to the procedure linkage table
418 entry for the symbol. */
419 HOWTO (R_PPC_PLTREL24, /* type */
420 0, /* rightshift */
421 2, /* size (0 = byte, 1 = short, 2 = long) */
422 26, /* bitsize */
423 true, /* pc_relative */
424 0, /* bitpos */
425 complain_overflow_signed, /* complain_on_overflow */
426 bfd_elf_generic_reloc, /* special_function */
427 "R_PPC_PLTREL24", /* name */
428 false, /* partial_inplace */
429 0, /* src_mask */
430 0x3fffffc, /* dst_mask */
431 true), /* pcrel_offset */
432
433 /* This is used only by the dynamic linker. The symbol should exist
434 both in the object being run and in some shared library. The
435 dynamic linker copies the data addressed by the symbol from the
436 shared library into the object, because the object being
437 run has to have the data at some particular address. */
438 HOWTO (R_PPC_COPY, /* type */
439 0, /* rightshift */
440 2, /* size (0 = byte, 1 = short, 2 = long) */
441 32, /* bitsize */
442 false, /* pc_relative */
443 0, /* bitpos */
444 complain_overflow_bitfield, /* complain_on_overflow */
445 bfd_elf_generic_reloc, /* special_function */
446 "R_PPC_COPY", /* name */
447 false, /* partial_inplace */
448 0, /* src_mask */
449 0, /* dst_mask */
450 false), /* pcrel_offset */
451
452 /* Like R_PPC_ADDR32, but used when setting global offset table
453 entries. */
454 HOWTO (R_PPC_GLOB_DAT, /* type */
455 0, /* rightshift */
456 2, /* size (0 = byte, 1 = short, 2 = long) */
457 32, /* bitsize */
458 false, /* pc_relative */
459 0, /* bitpos */
460 complain_overflow_bitfield, /* complain_on_overflow */
461 bfd_elf_generic_reloc, /* special_function */
462 "R_PPC_GLOB_DAT", /* name */
463 false, /* partial_inplace */
464 0, /* src_mask */
465 0xffffffff, /* dst_mask */
466 false), /* pcrel_offset */
467
468 /* Marks a procedure linkage table entry for a symbol. */
469 HOWTO (R_PPC_JMP_SLOT, /* type */
470 0, /* rightshift */
471 2, /* size (0 = byte, 1 = short, 2 = long) */
472 32, /* bitsize */
473 false, /* pc_relative */
474 0, /* bitpos */
475 complain_overflow_bitfield, /* complain_on_overflow */
476 bfd_elf_generic_reloc, /* special_function */
477 "R_PPC_JMP_SLOT", /* name */
478 false, /* partial_inplace */
479 0, /* src_mask */
480 0, /* dst_mask */
481 false), /* pcrel_offset */
482
483 /* Used only by the dynamic linker. When the object is run, this
484 longword is set to the load address of the object, plus the
485 addend. */
486 HOWTO (R_PPC_RELATIVE, /* type */
487 0, /* rightshift */
488 2, /* size (0 = byte, 1 = short, 2 = long) */
489 32, /* bitsize */
490 false, /* pc_relative */
491 0, /* bitpos */
492 complain_overflow_bitfield, /* complain_on_overflow */
493 bfd_elf_generic_reloc, /* special_function */
494 "R_PPC_RELATIVE", /* name */
495 false, /* partial_inplace */
496 0, /* src_mask */
497 0xffffffff, /* dst_mask */
498 false), /* pcrel_offset */
499
500 /* Like R_PPC_REL24, but uses the value of the symbol within the
501 object rather than the final value. Normally used for
502 _GLOBAL_OFFSET_TABLE_. */
503 HOWTO (R_PPC_LOCAL24PC, /* type */
504 0, /* rightshift */
505 2, /* size (0 = byte, 1 = short, 2 = long) */
506 26, /* bitsize */
507 true, /* pc_relative */
508 0, /* bitpos */
509 complain_overflow_signed, /* complain_on_overflow */
510 bfd_elf_generic_reloc, /* special_function */
511 "R_PPC_LOCAL24PC", /* name */
512 false, /* partial_inplace */
513 0, /* src_mask */
514 0x3fffffc, /* dst_mask */
515 true), /* pcrel_offset */
516
517 /* Like R_PPC_ADDR32, but may be unaligned. */
518 HOWTO (R_PPC_UADDR32, /* type */
519 0, /* rightshift */
520 2, /* size (0 = byte, 1 = short, 2 = long) */
521 32, /* bitsize */
522 false, /* pc_relative */
523 0, /* bitpos */
524 complain_overflow_bitfield, /* complain_on_overflow */
525 bfd_elf_generic_reloc, /* special_function */
526 "R_PPC_UADDR32", /* name */
527 false, /* partial_inplace */
528 0, /* src_mask */
529 0xffffffff, /* dst_mask */
530 false), /* pcrel_offset */
531
532 /* Like R_PPC_ADDR16, but may be unaligned. */
533 HOWTO (R_PPC_UADDR16, /* type */
534 0, /* rightshift */
535 1, /* size (0 = byte, 1 = short, 2 = long) */
536 16, /* bitsize */
537 false, /* pc_relative */
538 0, /* bitpos */
539 complain_overflow_bitfield, /* complain_on_overflow */
540 bfd_elf_generic_reloc, /* special_function */
541 "R_PPC_UADDR16", /* name */
542 false, /* partial_inplace */
543 0, /* src_mask */
544 0xffff, /* dst_mask */
545 false), /* pcrel_offset */
546
547 /* 32-bit PC relative */
548 HOWTO (R_PPC_REL32, /* type */
549 0, /* rightshift */
550 2, /* size (0 = byte, 1 = short, 2 = long) */
551 32, /* bitsize */
552 true, /* pc_relative */
553 0, /* bitpos */
554 complain_overflow_bitfield, /* complain_on_overflow */
555 bfd_elf_generic_reloc, /* special_function */
556 "R_PPC_REL32", /* name */
557 false, /* partial_inplace */
558 0, /* src_mask */
559 0xffffffff, /* dst_mask */
560 true), /* pcrel_offset */
561
562 /* 32-bit relocation to the symbol's procedure linkage table.
563 FIXME: not supported. */
564 HOWTO (R_PPC_PLT32, /* type */
565 0, /* rightshift */
566 2, /* size (0 = byte, 1 = short, 2 = long) */
567 32, /* bitsize */
568 false, /* pc_relative */
569 0, /* bitpos */
570 complain_overflow_bitfield, /* complain_on_overflow */
571 bfd_elf_generic_reloc, /* special_function */
572 "R_PPC_PLT32", /* name */
573 false, /* partial_inplace */
574 0, /* src_mask */
575 0, /* dst_mask */
576 false), /* pcrel_offset */
577
578 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
579 FIXME: not supported. */
580 HOWTO (R_PPC_PLTREL32, /* type */
581 0, /* rightshift */
582 2, /* size (0 = byte, 1 = short, 2 = long) */
583 32, /* bitsize */
584 true, /* pc_relative */
585 0, /* bitpos */
586 complain_overflow_bitfield, /* complain_on_overflow */
587 bfd_elf_generic_reloc, /* special_function */
588 "R_PPC_PLTREL32", /* name */
589 false, /* partial_inplace */
590 0, /* src_mask */
591 0, /* dst_mask */
592 true), /* pcrel_offset */
593
594 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
595 the symbol. */
596 HOWTO (R_PPC_PLT16_LO, /* type */
597 0, /* rightshift */
598 1, /* size (0 = byte, 1 = short, 2 = long) */
599 16, /* bitsize */
600 false, /* pc_relative */
601 0, /* bitpos */
602 complain_overflow_dont, /* complain_on_overflow */
603 bfd_elf_generic_reloc, /* special_function */
604 "R_PPC_PLT16_LO", /* name */
605 false, /* partial_inplace */
606 0, /* src_mask */
607 0xffff, /* dst_mask */
608 false), /* pcrel_offset */
609
610 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
611 the symbol. */
612 HOWTO (R_PPC_PLT16_HI, /* type */
613 16, /* rightshift */
614 1, /* size (0 = byte, 1 = short, 2 = long) */
615 16, /* bitsize */
616 false, /* pc_relative */
617 0, /* bitpos */
618 complain_overflow_bitfield, /* complain_on_overflow */
619 bfd_elf_generic_reloc, /* special_function */
620 "R_PPC_PLT16_HI", /* name */
621 false, /* partial_inplace */
622 0, /* src_mask */
623 0xffff, /* dst_mask */
624 false), /* pcrel_offset */
625
626 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
627 the symbol. */
628 HOWTO (R_PPC_PLT16_HA, /* type */
629 16, /* rightshift */
630 1, /* size (0 = byte, 1 = short, 2 = long) */
631 16, /* bitsize */
632 false, /* pc_relative */
633 0, /* bitpos */
634 complain_overflow_bitfield, /* complain_on_overflow */
635 ppc_elf_addr16_ha_reloc, /* special_function */
636 "R_PPC_PLT16_HA", /* name */
637 false, /* partial_inplace */
638 0, /* src_mask */
639 0xffff, /* dst_mask */
640 false), /* pcrel_offset */
641
642 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
643 small data items. */
644 HOWTO (R_PPC_SDAREL16, /* type */
645 0, /* rightshift */
646 1, /* size (0 = byte, 1 = short, 2 = long) */
647 16, /* bitsize */
648 false, /* pc_relative */
649 0, /* bitpos */
650 complain_overflow_signed, /* complain_on_overflow */
651 bfd_elf_generic_reloc, /* special_function */
652 "R_PPC_SDAREL16", /* name */
653 false, /* partial_inplace */
654 0, /* src_mask */
655 0xffff, /* dst_mask */
656 false), /* pcrel_offset */
657
658 /* 32-bit section relative relocation. */
659 HOWTO (R_PPC_SECTOFF, /* type */
660 0, /* rightshift */
661 2, /* size (0 = byte, 1 = short, 2 = long) */
662 32, /* bitsize */
663 true, /* pc_relative */
664 0, /* bitpos */
665 complain_overflow_bitfield, /* complain_on_overflow */
666 bfd_elf_generic_reloc, /* special_function */
667 "R_PPC_SECTOFF", /* name */
668 false, /* partial_inplace */
669 0, /* src_mask */
670 0, /* dst_mask */
671 true), /* pcrel_offset */
672
673 /* 16-bit lower half section relative relocation. */
674 HOWTO (R_PPC_SECTOFF_LO, /* type */
675 0, /* rightshift */
676 1, /* size (0 = byte, 1 = short, 2 = long) */
677 16, /* bitsize */
678 false, /* pc_relative */
679 0, /* bitpos */
680 complain_overflow_dont, /* complain_on_overflow */
681 bfd_elf_generic_reloc, /* special_function */
682 "R_PPC_SECTOFF_LO", /* name */
683 false, /* partial_inplace */
684 0, /* src_mask */
685 0xffff, /* dst_mask */
686 false), /* pcrel_offset */
687
688 /* 16-bit upper half section relative relocation. */
689 HOWTO (R_PPC_SECTOFF_HI, /* type */
690 16, /* rightshift */
691 1, /* size (0 = byte, 1 = short, 2 = long) */
692 16, /* bitsize */
693 false, /* pc_relative */
694 0, /* bitpos */
695 complain_overflow_bitfield, /* complain_on_overflow */
696 bfd_elf_generic_reloc, /* special_function */
697 "R_PPC_SECTOFF_HI", /* name */
698 false, /* partial_inplace */
699 0, /* src_mask */
700 0xffff, /* dst_mask */
701 false), /* pcrel_offset */
702
703 /* 16-bit upper half adjusted section relative relocation. */
704 HOWTO (R_PPC_SECTOFF_HA, /* type */
705 16, /* rightshift */
706 1, /* size (0 = byte, 1 = short, 2 = long) */
707 16, /* bitsize */
708 false, /* pc_relative */
709 0, /* bitpos */
710 complain_overflow_bitfield, /* complain_on_overflow */
711 ppc_elf_addr16_ha_reloc, /* special_function */
712 "R_PPC_SECTOFF_HA", /* name */
713 false, /* partial_inplace */
714 0, /* src_mask */
715 0xffff, /* dst_mask */
716 false), /* pcrel_offset */
717
718 /* The remaining relocs are from the Embedded ELF ABI, and are not
719 in the SVR4 ELF ABI. */
720
721 /* 32 bit value resulting from the addend minus the symbol */
722 HOWTO (R_PPC_EMB_NADDR32, /* type */
723 0, /* rightshift */
724 2, /* size (0 = byte, 1 = short, 2 = long) */
725 32, /* bitsize */
726 false, /* pc_relative */
727 0, /* bitpos */
728 complain_overflow_bitfield, /* complain_on_overflow */
729 bfd_elf_generic_reloc, /* special_function */
730 "R_PPC_EMB_NADDR32", /* name */
731 false, /* partial_inplace */
732 0, /* src_mask */
733 0xffffffff, /* dst_mask */
734 false), /* pcrel_offset */
735
736 /* 16 bit value resulting from the addend minus the symbol */
737 HOWTO (R_PPC_EMB_NADDR16, /* type */
738 0, /* rightshift */
739 1, /* size (0 = byte, 1 = short, 2 = long) */
740 16, /* bitsize */
741 false, /* pc_relative */
742 0, /* bitpos */
743 complain_overflow_bitfield, /* complain_on_overflow */
744 bfd_elf_generic_reloc, /* special_function */
745 "R_PPC_EMB_NADDR16", /* name */
746 false, /* partial_inplace */
747 0, /* src_mask */
748 0xffff, /* dst_mask */
749 false), /* pcrel_offset */
750
751 /* 16 bit value resulting from the addend minus the symbol */
752 HOWTO (R_PPC_EMB_NADDR16_LO, /* type */
753 0, /* rightshift */
754 1, /* size (0 = byte, 1 = short, 2 = long) */
755 16, /* bitsize */
756 false, /* pc_relative */
757 0, /* bitpos */
758 complain_overflow_dont,/* complain_on_overflow */
759 bfd_elf_generic_reloc, /* special_function */
760 "R_PPC_EMB_ADDR16_LO", /* name */
761 false, /* partial_inplace */
762 0, /* src_mask */
763 0xffff, /* dst_mask */
764 false), /* pcrel_offset */
765
766 /* The high order 16 bits of the addend minus the symbol */
767 HOWTO (R_PPC_EMB_NADDR16_HI, /* type */
768 16, /* rightshift */
769 1, /* size (0 = byte, 1 = short, 2 = long) */
770 16, /* bitsize */
771 false, /* pc_relative */
772 0, /* bitpos */
773 complain_overflow_dont, /* complain_on_overflow */
774 bfd_elf_generic_reloc, /* special_function */
775 "R_PPC_EMB_NADDR16_HI", /* name */
776 false, /* partial_inplace */
777 0, /* src_mask */
778 0xffff, /* dst_mask */
779 false), /* pcrel_offset */
780
781 /* The high order 16 bits of the result of the addend minus the address,
782 plus 1 if the contents of the low 16 bits, treated as a signed number,
783 is negative. */
784 HOWTO (R_PPC_EMB_NADDR16_HA, /* type */
785 16, /* rightshift */
786 1, /* size (0 = byte, 1 = short, 2 = long) */
787 16, /* bitsize */
788 false, /* pc_relative */
789 0, /* bitpos */
790 complain_overflow_dont, /* complain_on_overflow */
791 ppc_elf_addr16_ha_reloc, /* special_function */
792 "R_PPC_EMB_NADDR16_HA", /* name */
793 false, /* partial_inplace */
794 0, /* src_mask */
795 0xffff, /* dst_mask */
796 false), /* pcrel_offset */
797
798 /* 16 bit value resulting from allocating a 4 byte word to hold an
799 address in the .sdata section, and returning the offset from
800 _SDA_BASE_ for that relocation */
801 HOWTO (R_PPC_EMB_SDAI16, /* type */
802 0, /* rightshift */
803 1, /* size (0 = byte, 1 = short, 2 = long) */
804 16, /* bitsize */
805 false, /* pc_relative */
806 0, /* bitpos */
807 complain_overflow_bitfield, /* complain_on_overflow */
808 bfd_elf_generic_reloc, /* special_function */
809 "R_PPC_EMB_SDAI16", /* name */
810 false, /* partial_inplace */
811 0, /* src_mask */
812 0xffff, /* dst_mask */
813 false), /* pcrel_offset */
814
815 /* 16 bit value resulting from allocating a 4 byte word to hold an
816 address in the .sdata2 section, and returning the offset from
817 _SDA2_BASE_ for that relocation */
818 HOWTO (R_PPC_EMB_SDA2I16, /* type */
819 0, /* rightshift */
820 1, /* size (0 = byte, 1 = short, 2 = long) */
821 16, /* bitsize */
822 false, /* pc_relative */
823 0, /* bitpos */
824 complain_overflow_bitfield, /* complain_on_overflow */
825 bfd_elf_generic_reloc, /* special_function */
826 "R_PPC_EMB_SDA2I16", /* name */
827 false, /* partial_inplace */
828 0, /* src_mask */
829 0xffff, /* dst_mask */
830 false), /* pcrel_offset */
831
832 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
833 small data items. */
834 HOWTO (R_PPC_EMB_SDA2REL, /* type */
835 0, /* rightshift */
836 1, /* size (0 = byte, 1 = short, 2 = long) */
837 16, /* bitsize */
838 false, /* pc_relative */
839 0, /* bitpos */
840 complain_overflow_signed, /* complain_on_overflow */
841 bfd_elf_generic_reloc, /* special_function */
842 "R_PPC_EMB_SDA2REL", /* name */
843 false, /* partial_inplace */
844 0, /* src_mask */
845 0xffff, /* dst_mask */
846 false), /* pcrel_offset */
847
848 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
849 signed offset from the appropriate base, and filling in the register
850 field with the appropriate register (0, 2, or 13). */
851 HOWTO (R_PPC_EMB_SDA21, /* type */
852 0, /* rightshift */
853 2, /* size (0 = byte, 1 = short, 2 = long) */
854 16, /* bitsize */
855 false, /* pc_relative */
856 0, /* bitpos */
857 complain_overflow_signed, /* complain_on_overflow */
858 bfd_elf_generic_reloc, /* special_function */
859 "R_PPC_EMB_SDA21", /* name */
860 false, /* partial_inplace */
861 0, /* src_mask */
862 0xffff, /* dst_mask */
863 false), /* pcrel_offset */
864
865 /* Relocation not handled: R_PPC_EMB_MRKREF */
866 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
867 /* Relocation not handled: R_PPC_EMB_RELST_LO */
868 /* Relocation not handled: R_PPC_EMB_RELST_HI */
869 /* Relocation not handled: R_PPC_EMB_RELST_HA */
870 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
871
872 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
873 in the 16 bit signed offset from the appropriate base, and filling in the
874 register field with the appropriate register (0, 2, or 13). */
875 HOWTO (R_PPC_EMB_RELSDA, /* type */
876 0, /* rightshift */
877 1, /* size (0 = byte, 1 = short, 2 = long) */
878 16, /* bitsize */
879 true, /* pc_relative */
880 0, /* bitpos */
881 complain_overflow_signed, /* complain_on_overflow */
882 bfd_elf_generic_reloc, /* special_function */
883 "R_PPC_EMB_RELSDA", /* name */
884 false, /* partial_inplace */
885 0, /* src_mask */
886 0xffff, /* dst_mask */
887 false), /* pcrel_offset */
888
889 /* GNU extension to record C++ vtable hierarchy */
890 HOWTO (R_PPC_GNU_VTINHERIT, /* type */
891 0, /* rightshift */
892 0, /* size (0 = byte, 1 = short, 2 = long) */
893 0, /* bitsize */
894 false, /* pc_relative */
895 0, /* bitpos */
896 complain_overflow_dont, /* complain_on_overflow */
897 NULL, /* special_function */
898 "R_PPC_GNU_VTINHERIT", /* name */
899 false, /* partial_inplace */
900 0, /* src_mask */
901 0, /* dst_mask */
902 false), /* pcrel_offset */
903
904 /* GNU extension to record C++ vtable member usage */
905 HOWTO (R_PPC_GNU_VTENTRY, /* type */
906 0, /* rightshift */
907 0, /* size (0 = byte, 1 = short, 2 = long) */
908 0, /* bitsize */
909 false, /* pc_relative */
910 0, /* bitpos */
911 complain_overflow_dont, /* complain_on_overflow */
912 NULL, /* special_function */
913 "R_PPC_GNU_VTENTRY", /* name */
914 false, /* partial_inplace */
915 0, /* src_mask */
916 0, /* dst_mask */
917 false), /* pcrel_offset */
918
919 /* Phony reloc to handle AIX style TOC entries */
920 HOWTO (R_PPC_TOC16, /* type */
921 0, /* rightshift */
922 1, /* size (0 = byte, 1 = short, 2 = long) */
923 16, /* bitsize */
924 false, /* pc_relative */
925 0, /* bitpos */
926 complain_overflow_signed, /* complain_on_overflow */
927 bfd_elf_generic_reloc, /* special_function */
928 "R_PPC_TOC16", /* name */
929 false, /* partial_inplace */
930 0, /* src_mask */
931 0xffff, /* dst_mask */
932 false), /* pcrel_offset */
933 };
934
935 \f
936 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
937
938 static void
939 ppc_elf_howto_init ()
940 {
941 unsigned int i, type;
942
943 for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++)
944 {
945 type = ppc_elf_howto_raw[i].type;
946 BFD_ASSERT (type < sizeof(ppc_elf_howto_table) / sizeof(ppc_elf_howto_table[0]));
947 ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i];
948 }
949 }
950
951 \f
952 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
953
954 The MPC860, revision C0 or earlier contains a bug in the die.
955 If all of the following conditions are true, the next instruction
956 to be executed *may* be treated as a no-op.
957 1/ A forward branch is executed.
958 2/ The branch is predicted as not taken.
959 3/ The branch is taken.
960 4/ The branch is located in the last 5 words of a page.
961 (The EOP limit is 5 by default but may be specified as any value from 1-10.)
962
963 Our software solution is to detect these problematic branches in a
964 linker pass and modify them as follows:
965 1/ Unconditional branches - Since these are always predicted taken,
966 there is no problem and no action is required.
967 2/ Conditional backward branches - No problem, no action required.
968 3/ Conditional forward branches - Ensure that the "inverse prediction
969 bit" is set (ensure it is predicted taken).
970 4/ Conditional register branches - Ensure that the "y bit" is set
971 (ensure it is predicted taken).
972 */
973
974 /* Sort sections by address. */
975
976 static int
977 ppc_elf_sort_rela (arg1, arg2)
978 const void *arg1;
979 const void *arg2;
980 {
981 const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1;
982 const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2;
983
984 /* Sort by offset. */
985 return ((*rela1)->r_offset - (*rela2)->r_offset);
986 }
987
988 static boolean
989 ppc_elf_relax_section (abfd, isec, link_info, again)
990 bfd *abfd;
991 asection *isec;
992 struct bfd_link_info *link_info;
993 boolean *again;
994 {
995 #define PAGESIZE 0x1000
996
997 bfd_byte *contents = NULL;
998 bfd_byte *free_contents = NULL;
999 Elf_Internal_Rela *internal_relocs = NULL;
1000 Elf_Internal_Rela *free_relocs = NULL;
1001 Elf_Internal_Rela **rela_comb = NULL;
1002 int comb_curr, comb_count;
1003
1004 /* We never have to do this more than once per input section. */
1005 *again = false;
1006
1007 /* If needed, initialize this section's cooked size. */
1008 if (isec->_cooked_size == 0)
1009 isec->_cooked_size = isec->_raw_size;
1010
1011 /* We're only interested in text sections which overlap the
1012 troublesome area at the end of a page. */
1013 if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size)
1014 {
1015 bfd_vma dot, end_page, end_section;
1016 boolean section_modified;
1017
1018 /* Get the section contents. */
1019 /* Get cached copy if it exists. */
1020 if (elf_section_data (isec)->this_hdr.contents != NULL)
1021 contents = elf_section_data (isec)->this_hdr.contents;
1022 else
1023 {
1024 /* Go get them off disk. */
1025 contents = (bfd_byte *) bfd_malloc (isec->_raw_size);
1026 if (contents == NULL)
1027 goto error_return;
1028 free_contents = contents;
1029
1030 if (! bfd_get_section_contents (abfd, isec, contents,
1031 (file_ptr) 0, isec->_raw_size))
1032 goto error_return;
1033 }
1034
1035 comb_curr = 0;
1036 comb_count = 0;
1037 if (isec->reloc_count)
1038 {
1039 unsigned n;
1040
1041 /* Get a copy of the native relocations. */
1042 internal_relocs = _bfd_elf32_link_read_relocs (
1043 abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
1044 link_info->keep_memory);
1045 if (internal_relocs == NULL)
1046 goto error_return;
1047 if (! link_info->keep_memory)
1048 free_relocs = internal_relocs;
1049
1050 /* Setup a faster access method for the reloc info we need. */
1051 rela_comb = (Elf_Internal_Rela**)
1052 bfd_malloc (isec->reloc_count*sizeof(Elf_Internal_Rela*));
1053 if (rela_comb == NULL)
1054 goto error_return;
1055 for (n=0; n<isec->reloc_count; ++n)
1056 {
1057 long r_type;
1058
1059 r_type = ELF32_R_TYPE (internal_relocs[n].r_info);
1060 if (r_type < 0 || r_type >= (int)R_PPC_max)
1061 goto error_return;
1062
1063 /* Prologue constants are sometimes present in the ".text"
1064 sections and they can be identified by their associated relocation.
1065 We don't want to process those words and some others which
1066 can also be identified by their relocations. However, not all
1067 conditional branches will have a relocation so we will
1068 only ignore words that 1) have a reloc, and 2) the reloc
1069 is not applicable to a conditional branch.
1070 The array rela_comb is built here for use in the EOP scan loop. */
1071 switch (r_type)
1072 {
1073 case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */
1074 case R_PPC_REL14: /* relative cond. br. */
1075 case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */
1076 /* We should check the instruction. */
1077 break;
1078 default:
1079 /* The word is not a conditional branch - ignore it. */
1080 rela_comb[comb_count++] = &internal_relocs[n];
1081 break;
1082 }
1083 }
1084 if (comb_count > 1)
1085 qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela);
1086 }
1087
1088 /* Enumerate each EOP region that overlaps this section. */
1089 end_section = isec->vma + isec->_cooked_size;
1090 dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1;
1091 dot -= link_info->mpc860c0;
1092 section_modified = false;
1093 if (dot < isec->vma) /* Increment the start position if this section */
1094 dot = isec->vma; /* begins in the middle of its first EOP region. */
1095 for (;
1096 dot < end_section;
1097 dot += PAGESIZE, end_page += PAGESIZE)
1098 {
1099
1100 /* Check each word in this EOP region. */
1101 for (; dot < end_page; dot += 4)
1102 {
1103 bfd_vma isec_offset;
1104 unsigned long insn;
1105 boolean skip, modified;
1106
1107 /* Don't process this word if there is a relocation for it and
1108 the relocation indicates the word is not a conditional branch. */
1109 skip = false;
1110 isec_offset = dot - isec->vma;
1111 for (; comb_curr<comb_count; ++comb_curr)
1112 {
1113 bfd_vma r_offset;
1114
1115 r_offset = rela_comb[comb_curr]->r_offset;
1116 if (r_offset >= isec_offset)
1117 {
1118 if (r_offset == isec_offset) skip = true;
1119 break;
1120 }
1121 }
1122 if (skip) continue;
1123
1124 /* Check the current word for a problematic conditional branch. */
1125 #define BO0(insn) ((insn) & 0x02000000)
1126 #define BO2(insn) ((insn) & 0x00800000)
1127 #define BO4(insn) ((insn) & 0x00200000)
1128 insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset);
1129 modified = false;
1130 if ((insn & 0xFc000000) == 0x40000000)
1131 {
1132 /* Instruction is BCx */
1133 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1134 {
1135 bfd_vma target;
1136 /* This branch is predicted as "normal".
1137 If this is a forward branch, it is problematic. */
1138
1139 target = insn & 0x0000Fffc; /*extract*/
1140 target = (target ^ 0x8000) - 0x8000; /*sign extend*/
1141 if ((insn & 0x00000002) == 0)
1142 target += dot; /*convert to abs*/
1143 if (target > dot)
1144 {
1145 insn |= 0x00200000; /* set the prediction bit */
1146 modified = true;
1147 }
1148 }
1149 }
1150 else if ((insn & 0xFc00Fffe) == 0x4c000420)
1151 {
1152 /* Instruction is BCCTRx */
1153 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1154 {
1155 /* This branch is predicted as not-taken.
1156 If this is a forward branch, it is problematic.
1157 Since we can't tell statically if it will branch forward,
1158 always set the prediction bit. */
1159 insn |= 0x00200000; /* set the prediction bit */
1160 modified = true;
1161 }
1162 }
1163 else if ((insn & 0xFc00Fffe) == 0x4c000020)
1164 {
1165 /* Instruction is BCLRx */
1166 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1167 {
1168 /* This branch is predicted as not-taken.
1169 If this is a forward branch, it is problematic.
1170 Since we can't tell statically if it will branch forward,
1171 always set the prediction bit. */
1172 insn |= 0x00200000; /* set the prediction bit */
1173 modified = true;
1174 }
1175 }
1176 #undef BO0
1177 #undef BO2
1178 #undef BO4
1179 if (modified)
1180 {
1181 bfd_put_32 (abfd, insn, contents + isec_offset);
1182 section_modified = true;
1183 }
1184 }
1185 }
1186 if (section_modified)
1187 {
1188 elf_section_data (isec)->this_hdr.contents = contents;
1189 free_contents = NULL;
1190 }
1191 }
1192
1193 if (rela_comb != NULL)
1194 {
1195 free (rela_comb);
1196 rela_comb = NULL;
1197 }
1198
1199 if (free_relocs != NULL)
1200 {
1201 free (free_relocs);
1202 free_relocs = NULL;
1203 }
1204
1205 if (free_contents != NULL)
1206 {
1207 if (! link_info->keep_memory)
1208 free (free_contents);
1209 else
1210 {
1211 /* Cache the section contents for elf_link_input_bfd. */
1212 elf_section_data (isec)->this_hdr.contents = contents;
1213 }
1214 free_contents = NULL;
1215 }
1216
1217 return true;
1218
1219 error_return:
1220 if (rela_comb != NULL)
1221 free (rela_comb);
1222 if (free_relocs != NULL)
1223 free (free_relocs);
1224 if (free_contents != NULL)
1225 free (free_contents);
1226 return false;
1227 }
1228
1229 \f
1230 static reloc_howto_type *
1231 ppc_elf_reloc_type_lookup (abfd, code)
1232 bfd *abfd ATTRIBUTE_UNUSED;
1233 bfd_reloc_code_real_type code;
1234 {
1235 enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE;
1236
1237 if (!ppc_elf_howto_table[R_PPC_ADDR32])
1238 /* Initialize howto table if needed */
1239 ppc_elf_howto_init ();
1240
1241 switch ((int)code)
1242 {
1243 default:
1244 return (reloc_howto_type *)NULL;
1245
1246 case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break;
1247 case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break;
1248 case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break;
1249 case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break;
1250 case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break;
1251 case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break;
1252 case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break;
1253 case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break;
1254 case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break;
1255 case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break;
1256 case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break;
1257 case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break;
1258 case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break;
1259 case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break;
1260 case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break;
1261 case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break;
1262 case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break;
1263 case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break;
1264 case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break;
1265 case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break;
1266 case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break;
1267 case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break;
1268 case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break;
1269 case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break;
1270 case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break;
1271 case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break;
1272 case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break;
1273 case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break;
1274 case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break;
1275 case BFD_RELOC_32_BASEREL: ppc_reloc = R_PPC_SECTOFF; break;
1276 case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break;
1277 case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break;
1278 case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break;
1279 case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break;
1280 case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break;
1281 case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break;
1282 case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break;
1283 case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break;
1284 case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break;
1285 case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break;
1286 case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break;
1287 case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break;
1288 case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break;
1289 case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break;
1290 case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break;
1291 case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break;
1292 case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break;
1293 case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break;
1294 case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break;
1295 case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break;
1296 case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break;
1297 case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break;
1298 case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; break;
1299 }
1300
1301 return ppc_elf_howto_table[ (int)ppc_reloc ];
1302 };
1303
1304 /* Set the howto pointer for a PowerPC ELF reloc. */
1305
1306 static void
1307 ppc_elf_info_to_howto (abfd, cache_ptr, dst)
1308 bfd *abfd ATTRIBUTE_UNUSED;
1309 arelent *cache_ptr;
1310 Elf32_Internal_Rela *dst;
1311 {
1312 if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */
1313 ppc_elf_howto_init ();
1314
1315 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max);
1316 cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
1317 }
1318
1319 /* Handle the R_PPC_ADDR16_HA reloc. */
1320
1321 static bfd_reloc_status_type
1322 ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section,
1323 output_bfd, error_message)
1324 bfd *abfd ATTRIBUTE_UNUSED;
1325 arelent *reloc_entry;
1326 asymbol *symbol;
1327 PTR data ATTRIBUTE_UNUSED;
1328 asection *input_section;
1329 bfd *output_bfd;
1330 char **error_message ATTRIBUTE_UNUSED;
1331 {
1332 bfd_vma relocation;
1333
1334 if (output_bfd != NULL)
1335 {
1336 reloc_entry->address += input_section->output_offset;
1337 return bfd_reloc_ok;
1338 }
1339
1340 if (reloc_entry->address > input_section->_cooked_size)
1341 return bfd_reloc_outofrange;
1342
1343 if (bfd_is_com_section (symbol->section))
1344 relocation = 0;
1345 else
1346 relocation = symbol->value;
1347
1348 relocation += symbol->section->output_section->vma;
1349 relocation += symbol->section->output_offset;
1350 relocation += reloc_entry->addend;
1351
1352 reloc_entry->addend += (relocation & 0x8000) << 1;
1353
1354 return bfd_reloc_continue;
1355 }
1356
1357 /* Function to set whether a module needs the -mrelocatable bit set. */
1358
1359 static boolean
1360 ppc_elf_set_private_flags (abfd, flags)
1361 bfd *abfd;
1362 flagword flags;
1363 {
1364 BFD_ASSERT (!elf_flags_init (abfd)
1365 || elf_elfheader (abfd)->e_flags == flags);
1366
1367 elf_elfheader (abfd)->e_flags = flags;
1368 elf_flags_init (abfd) = true;
1369 return true;
1370 }
1371
1372 /* Copy backend specific data from one object module to another */
1373 static boolean
1374 ppc_elf_copy_private_bfd_data (ibfd, obfd)
1375 bfd *ibfd;
1376 bfd *obfd;
1377 {
1378 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1379 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1380 return true;
1381
1382 BFD_ASSERT (!elf_flags_init (obfd)
1383 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
1384
1385 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
1386 elf_flags_init (obfd) = true;
1387 return true;
1388 }
1389
1390 /* Merge backend specific data from an object file to the output
1391 object file when linking */
1392 static boolean
1393 ppc_elf_merge_private_bfd_data (ibfd, obfd)
1394 bfd *ibfd;
1395 bfd *obfd;
1396 {
1397 flagword old_flags;
1398 flagword new_flags;
1399 boolean error;
1400
1401 /* Check if we have the same endianess */
1402 if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
1403 return false;
1404
1405 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1406 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1407 return true;
1408
1409 new_flags = elf_elfheader (ibfd)->e_flags;
1410 old_flags = elf_elfheader (obfd)->e_flags;
1411 if (!elf_flags_init (obfd)) /* First call, no flags set */
1412 {
1413 elf_flags_init (obfd) = true;
1414 elf_elfheader (obfd)->e_flags = new_flags;
1415 }
1416
1417 else if (new_flags == old_flags) /* Compatible flags are ok */
1418 ;
1419
1420 else /* Incompatible flags */
1421 {
1422 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked
1423 with either. */
1424 error = false;
1425 if ((new_flags & EF_PPC_RELOCATABLE) != 0
1426 && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0)
1427 {
1428 error = true;
1429 (*_bfd_error_handler)
1430 (_("%s: compiled with -mrelocatable and linked with modules compiled normally"),
1431 bfd_get_filename (ibfd));
1432 }
1433 else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
1434 && (old_flags & EF_PPC_RELOCATABLE) != 0)
1435 {
1436 error = true;
1437 (*_bfd_error_handler)
1438 (_("%s: compiled normally and linked with modules compiled with -mrelocatable"),
1439 bfd_get_filename (ibfd));
1440 }
1441
1442 /* The output is -mrelocatable-lib iff both the input files are. */
1443 if (! (new_flags & EF_PPC_RELOCATABLE_LIB))
1444 elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB;
1445
1446 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
1447 but each input file is either -mrelocatable or -mrelocatable-lib. */
1448 if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB)
1449 && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))
1450 && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)))
1451 elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE;
1452
1453 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */
1454 elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB);
1455
1456 new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1457 old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1458
1459 /* Warn about any other mismatches */
1460 if (new_flags != old_flags)
1461 {
1462 error = true;
1463 (*_bfd_error_handler)
1464 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
1465 bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
1466 }
1467
1468 if (error)
1469 {
1470 bfd_set_error (bfd_error_bad_value);
1471 return false;
1472 }
1473 }
1474
1475 return true;
1476 }
1477
1478 \f
1479 /* Handle a PowerPC specific section when reading an object file. This
1480 is called when elfcode.h finds a section with an unknown type. */
1481
1482 static boolean
1483 ppc_elf_section_from_shdr (abfd, hdr, name)
1484 bfd *abfd;
1485 Elf32_Internal_Shdr *hdr;
1486 char *name;
1487 {
1488 asection *newsect;
1489 flagword flags;
1490
1491 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
1492 return false;
1493
1494 newsect = hdr->bfd_section;
1495 flags = bfd_get_section_flags (abfd, newsect);
1496 if (hdr->sh_flags & SHF_EXCLUDE)
1497 flags |= SEC_EXCLUDE;
1498
1499 if (hdr->sh_type == SHT_ORDERED)
1500 flags |= SEC_SORT_ENTRIES;
1501
1502 bfd_set_section_flags (abfd, newsect, flags);
1503 return true;
1504 }
1505
1506 \f
1507 /* Set up any other section flags and such that may be necessary. */
1508
1509 static boolean
1510 ppc_elf_fake_sections (abfd, shdr, asect)
1511 bfd *abfd ATTRIBUTE_UNUSED;
1512 Elf32_Internal_Shdr *shdr;
1513 asection *asect;
1514 {
1515 if ((asect->flags & SEC_EXCLUDE) != 0)
1516 shdr->sh_flags |= SHF_EXCLUDE;
1517
1518 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
1519 shdr->sh_type = SHT_ORDERED;
1520
1521 return true;
1522 }
1523
1524 \f
1525 /* Create a special linker section */
1526 static elf_linker_section_t *
1527 ppc_elf_create_linker_section (abfd, info, which)
1528 bfd *abfd;
1529 struct bfd_link_info *info;
1530 enum elf_linker_section_enum which;
1531 {
1532 bfd *dynobj = elf_hash_table (info)->dynobj;
1533 elf_linker_section_t *lsect;
1534
1535 /* Record the first bfd section that needs the special section */
1536 if (!dynobj)
1537 dynobj = elf_hash_table (info)->dynobj = abfd;
1538
1539 /* If this is the first time, create the section */
1540 lsect = elf_linker_section (dynobj, which);
1541 if (!lsect)
1542 {
1543 elf_linker_section_t defaults;
1544 static elf_linker_section_t zero_section;
1545
1546 defaults = zero_section;
1547 defaults.which = which;
1548 defaults.hole_written_p = false;
1549 defaults.alignment = 2;
1550
1551 /* Both of these sections are (technically) created by the user
1552 putting data in them, so they shouldn't be marked
1553 SEC_LINKER_CREATED.
1554
1555 The linker creates them so it has somewhere to attach their
1556 respective symbols. In fact, if they were empty it would
1557 be OK to leave the symbol set to 0 (or any random number), because
1558 the appropriate register should never be used. */
1559 defaults.flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1560 | SEC_IN_MEMORY);
1561
1562 switch (which)
1563 {
1564 default:
1565 (*_bfd_error_handler) (_("%s: Unknown special linker type %d"),
1566 bfd_get_filename (abfd),
1567 (int)which);
1568
1569 bfd_set_error (bfd_error_bad_value);
1570 return (elf_linker_section_t *)0;
1571
1572 case LINKER_SECTION_SDATA: /* .sdata/.sbss section */
1573 defaults.name = ".sdata";
1574 defaults.rel_name = ".rela.sdata";
1575 defaults.bss_name = ".sbss";
1576 defaults.sym_name = "_SDA_BASE_";
1577 defaults.sym_offset = 32768;
1578 break;
1579
1580 case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */
1581 defaults.name = ".sdata2";
1582 defaults.rel_name = ".rela.sdata2";
1583 defaults.bss_name = ".sbss2";
1584 defaults.sym_name = "_SDA2_BASE_";
1585 defaults.sym_offset = 32768;
1586 defaults.flags |= SEC_READONLY;
1587 break;
1588 }
1589
1590 lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults);
1591 }
1592
1593 return lsect;
1594 }
1595
1596 \f
1597 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we need to bump up
1598 the number of section headers. */
1599
1600 static int
1601 ppc_elf_additional_program_headers (abfd)
1602 bfd *abfd;
1603 {
1604 asection *s;
1605 int ret;
1606
1607 ret = 0;
1608
1609 s = bfd_get_section_by_name (abfd, ".interp");
1610 if (s != NULL)
1611 ++ret;
1612
1613 s = bfd_get_section_by_name (abfd, ".sbss2");
1614 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1615 ++ret;
1616
1617 s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0");
1618 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1619 ++ret;
1620
1621 return ret;
1622 }
1623
1624 /* Modify the segment map if needed */
1625
1626 static boolean
1627 ppc_elf_modify_segment_map (abfd)
1628 bfd *abfd ATTRIBUTE_UNUSED;
1629 {
1630 return true;
1631 }
1632 \f
1633 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
1634 to output sections (just like _bfd_elf_create_dynamic_sections has
1635 to create .dynbss and .rela.bss). */
1636
1637 static boolean
1638 ppc_elf_create_dynamic_sections (abfd, info)
1639 bfd *abfd;
1640 struct bfd_link_info *info;
1641 {
1642 register asection *s;
1643 flagword flags;
1644
1645 if (!_bfd_elf_create_dynamic_sections(abfd, info))
1646 return false;
1647
1648 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1649 | SEC_LINKER_CREATED);
1650
1651 s = bfd_make_section (abfd, ".dynsbss");
1652 if (s == NULL
1653 || ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
1654 return false;
1655
1656 if (! info->shared)
1657 {
1658 s = bfd_make_section (abfd, ".rela.sbss");
1659 if (s == NULL
1660 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1661 || ! bfd_set_section_alignment (abfd, s, 2))
1662 return false;
1663 }
1664 return true;
1665 }
1666
1667 /* Adjust a symbol defined by a dynamic object and referenced by a
1668 regular object. The current definition is in some section of the
1669 dynamic object, but we're not including those sections. We have to
1670 change the definition to something the rest of the link can
1671 understand. */
1672
1673 static boolean
1674 ppc_elf_adjust_dynamic_symbol (info, h)
1675 struct bfd_link_info *info;
1676 struct elf_link_hash_entry *h;
1677 {
1678 bfd *dynobj = elf_hash_table (info)->dynobj;
1679 asection *s;
1680 unsigned int power_of_two;
1681 bfd_vma plt_offset;
1682
1683 #ifdef DEBUG
1684 fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string);
1685 #endif
1686
1687 /* Make sure we know what is going on here. */
1688 BFD_ASSERT (dynobj != NULL
1689 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
1690 || h->weakdef != NULL
1691 || ((h->elf_link_hash_flags
1692 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1693 && (h->elf_link_hash_flags
1694 & ELF_LINK_HASH_REF_REGULAR) != 0
1695 && (h->elf_link_hash_flags
1696 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
1697
1698
1699 /* If this is a function, put it in the procedure linkage table. We
1700 will fill in the contents of the procedure linkage table later,
1701 when we know the address of the .got section. */
1702 if (h->type == STT_FUNC
1703 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1704 {
1705 if (! elf_hash_table (info)->dynamic_sections_created
1706 || ((!info->shared || info->symbolic || h->dynindx == -1)
1707 && (h->elf_link_hash_flags
1708 & ELF_LINK_HASH_DEF_REGULAR) != 0)
1709 || (info->shared && h->plt.refcount <= 0))
1710 {
1711 /* A PLT entry is not required/allowed when:
1712
1713 1. We are not using ld.so; because then the PLT entry
1714 can't be set up, so we can't use one.
1715
1716 2. We know for certain that a symbol is defined in
1717 this object, because this object is the application,
1718 is linked with -Bsymbolic, or because the symbol is local.
1719
1720 3. GC has rendered the entry unused.
1721 Note, however, that in an executable all references to the
1722 symbol go to the PLT, so we can't turn it off in that case.
1723 ??? The correct thing to do here is to reference count
1724 all uses of the symbol, not just those to the GOT or PLT. */
1725 h->plt.offset = (bfd_vma) -1;
1726 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1727 return true;
1728 }
1729
1730 /* Make sure this symbol is output as a dynamic symbol. */
1731 if (h->dynindx == -1)
1732 {
1733 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1734 return false;
1735 }
1736 BFD_ASSERT (h->dynindx != -1);
1737
1738 s = bfd_get_section_by_name (dynobj, ".plt");
1739 BFD_ASSERT (s != NULL);
1740
1741 /* If this is the first .plt entry, make room for the special
1742 first entry. */
1743 if (s->_raw_size == 0)
1744 s->_raw_size += PLT_INITIAL_ENTRY_SIZE;
1745
1746 /* The PowerPC PLT is actually composed of two parts, the first part
1747 is 2 words (for a load and a jump), and then there is a remaining
1748 word available at the end. */
1749 plt_offset = (PLT_INITIAL_ENTRY_SIZE
1750 + (PLT_SLOT_SIZE
1751 * ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE)
1752 / PLT_ENTRY_SIZE)));
1753
1754 /* If this symbol is not defined in a regular file, and we are
1755 not generating a shared library, then set the symbol to this
1756 location in the .plt. This is required to make function
1757 pointers compare as equal between the normal executable and
1758 the shared library. */
1759 if (! info->shared
1760 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1761 {
1762 h->root.u.def.section = s;
1763 h->root.u.def.value = plt_offset;
1764 }
1765
1766 h->plt.offset = plt_offset;
1767
1768 /* Make room for this entry. After the 8192nd entry, room
1769 for two entries is allocated. */
1770 if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
1771 >= PLT_NUM_SINGLE_ENTRIES)
1772 s->_raw_size += 2 * PLT_ENTRY_SIZE;
1773 else
1774 s->_raw_size += PLT_ENTRY_SIZE;
1775
1776 /* We also need to make an entry in the .rela.plt section. */
1777 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1778 BFD_ASSERT (s != NULL);
1779 s->_raw_size += sizeof (Elf32_External_Rela);
1780
1781 return true;
1782 }
1783
1784 /* If this is a weak symbol, and there is a real definition, the
1785 processor independent code will have arranged for us to see the
1786 real definition first, and we can just use the same value. */
1787 if (h->weakdef != NULL)
1788 {
1789 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1790 || h->weakdef->root.type == bfd_link_hash_defweak);
1791 h->root.u.def.section = h->weakdef->root.u.def.section;
1792 h->root.u.def.value = h->weakdef->root.u.def.value;
1793 return true;
1794 }
1795
1796 /* This is a reference to a symbol defined by a dynamic object which
1797 is not a function. */
1798
1799 /* If we are creating a shared library, we must presume that the
1800 only references to the symbol are via the global offset table.
1801 For such cases we need not do anything here; the relocations will
1802 be handled correctly by relocate_section. */
1803 if (info->shared)
1804 return true;
1805
1806 /* We must allocate the symbol in our .dynbss section, which will
1807 become part of the .bss section of the executable. There will be
1808 an entry for this symbol in the .dynsym section. The dynamic
1809 object will contain position independent code, so all references
1810 from the dynamic object to this symbol will go through the global
1811 offset table. The dynamic linker will use the .dynsym entry to
1812 determine the address it must put in the global offset table, so
1813 both the dynamic object and the regular object will refer to the
1814 same memory location for the variable.
1815
1816 Of course, if the symbol is sufficiently small, we must instead
1817 allocate it in .sbss. FIXME: It would be better to do this if and
1818 only if there were actually SDAREL relocs for that symbol. */
1819
1820 if (h->size <= elf_gp_size (dynobj))
1821 s = bfd_get_section_by_name (dynobj, ".dynsbss");
1822 else
1823 s = bfd_get_section_by_name (dynobj, ".dynbss");
1824 BFD_ASSERT (s != NULL);
1825
1826 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
1827 copy the initial value out of the dynamic object and into the
1828 runtime process image. We need to remember the offset into the
1829 .rela.bss section we are going to use. */
1830 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1831 {
1832 asection *srel;
1833
1834 if (h->size <= elf_gp_size (dynobj))
1835 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
1836 else
1837 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1838 BFD_ASSERT (srel != NULL);
1839 srel->_raw_size += sizeof (Elf32_External_Rela);
1840 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1841 }
1842
1843 /* We need to figure out the alignment required for this symbol. I
1844 have no idea how ELF linkers handle this. */
1845 power_of_two = bfd_log2 (h->size);
1846 if (power_of_two > 4)
1847 power_of_two = 4;
1848
1849 /* Apply the required alignment. */
1850 s->_raw_size = BFD_ALIGN (s->_raw_size,
1851 (bfd_size_type) (1 << power_of_two));
1852 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1853 {
1854 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1855 return false;
1856 }
1857
1858 /* Define the symbol as being at this point in the section. */
1859 h->root.u.def.section = s;
1860 h->root.u.def.value = s->_raw_size;
1861
1862 /* Increment the section size to make room for the symbol. */
1863 s->_raw_size += h->size;
1864
1865 return true;
1866 }
1867
1868 \f
1869 /* Set the sizes of the dynamic sections. */
1870
1871 static boolean
1872 ppc_elf_size_dynamic_sections (output_bfd, info)
1873 bfd *output_bfd;
1874 struct bfd_link_info *info;
1875 {
1876 bfd *dynobj;
1877 asection *s;
1878 boolean plt;
1879 boolean relocs;
1880 boolean reltext;
1881
1882 #ifdef DEBUG
1883 fprintf (stderr, "ppc_elf_size_dynamic_sections called\n");
1884 #endif
1885
1886 dynobj = elf_hash_table (info)->dynobj;
1887 BFD_ASSERT (dynobj != NULL);
1888
1889 if (elf_hash_table (info)->dynamic_sections_created)
1890 {
1891 /* Set the contents of the .interp section to the interpreter. */
1892 if (! info->shared)
1893 {
1894 s = bfd_get_section_by_name (dynobj, ".interp");
1895 BFD_ASSERT (s != NULL);
1896 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1897 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1898 }
1899 }
1900 else
1901 {
1902 /* We may have created entries in the .rela.got, .rela.sdata, and
1903 .rela.sdata2 sections. However, if we are not creating the
1904 dynamic sections, we will not actually use these entries. Reset
1905 the size of .rela.got, et al, which will cause it to get
1906 stripped from the output file below. */
1907 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
1908 ".rela.sdata2", ".rela.sbss",
1909 (char *)0 };
1910 char **p;
1911
1912 for (p = rela_sections; *p != (char *)0; p++)
1913 {
1914 s = bfd_get_section_by_name (dynobj, *p);
1915 if (s != NULL)
1916 s->_raw_size = 0;
1917 }
1918 }
1919
1920 /* The check_relocs and adjust_dynamic_symbol entry points have
1921 determined the sizes of the various dynamic sections. Allocate
1922 memory for them. */
1923 plt = false;
1924 relocs = false;
1925 reltext = false;
1926 for (s = dynobj->sections; s != NULL; s = s->next)
1927 {
1928 const char *name;
1929 boolean strip;
1930
1931 if ((s->flags & SEC_LINKER_CREATED) == 0)
1932 continue;
1933
1934 /* It's OK to base decisions on the section name, because none
1935 of the dynobj section names depend upon the input files. */
1936 name = bfd_get_section_name (dynobj, s);
1937
1938 strip = false;
1939
1940 if (strcmp (name, ".plt") == 0)
1941 {
1942 if (s->_raw_size == 0)
1943 {
1944 /* Strip this section if we don't need it; see the
1945 comment below. */
1946 strip = true;
1947 }
1948 else
1949 {
1950 /* Remember whether there is a PLT. */
1951 plt = true;
1952 }
1953 }
1954 else if (strncmp (name, ".rela", 5) == 0)
1955 {
1956 if (s->_raw_size == 0)
1957 {
1958 /* If we don't need this section, strip it from the
1959 output file. This is mostly to handle .rela.bss and
1960 .rela.plt. We must create both sections in
1961 create_dynamic_sections, because they must be created
1962 before the linker maps input sections to output
1963 sections. The linker does that before
1964 adjust_dynamic_symbol is called, and it is that
1965 function which decides whether anything needs to go
1966 into these sections. */
1967 strip = true;
1968 }
1969 else
1970 {
1971 asection *target;
1972 const char *outname;
1973
1974 /* Remember whether there are any relocation sections. */
1975 relocs = true;
1976
1977 /* If this relocation section applies to a read only
1978 section, then we probably need a DT_TEXTREL entry. */
1979 outname = bfd_get_section_name (output_bfd,
1980 s->output_section);
1981 target = bfd_get_section_by_name (output_bfd, outname + 5);
1982 if (target != NULL
1983 && (target->flags & SEC_READONLY) != 0
1984 && (target->flags & SEC_ALLOC) != 0)
1985 reltext = true;
1986
1987 /* We use the reloc_count field as a counter if we need
1988 to copy relocs into the output file. */
1989 s->reloc_count = 0;
1990 }
1991 }
1992 else if (strcmp (name, ".got") != 0
1993 && strcmp (name, ".sdata") != 0
1994 && strcmp (name, ".sdata2") != 0)
1995 {
1996 /* It's not one of our sections, so don't allocate space. */
1997 continue;
1998 }
1999
2000 if (strip)
2001 {
2002 _bfd_strip_section_from_output (info, s);
2003 continue;
2004 }
2005
2006 /* Allocate memory for the section contents. */
2007 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2008 if (s->contents == NULL && s->_raw_size != 0)
2009 return false;
2010 }
2011
2012 if (elf_hash_table (info)->dynamic_sections_created)
2013 {
2014 /* Add some entries to the .dynamic section. We fill in the
2015 values later, in ppc_elf_finish_dynamic_sections, but we
2016 must add the entries now so that we get the correct size for
2017 the .dynamic section. The DT_DEBUG entry is filled in by the
2018 dynamic linker and used by the debugger. */
2019 if (! info->shared)
2020 {
2021 if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
2022 return false;
2023 }
2024
2025 if (plt)
2026 {
2027 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
2028 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
2029 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
2030 || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
2031 return false;
2032 }
2033
2034 if (relocs)
2035 {
2036 if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
2037 || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
2038 || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
2039 sizeof (Elf32_External_Rela)))
2040 return false;
2041 }
2042
2043 if (reltext)
2044 {
2045 if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
2046 return false;
2047 }
2048 }
2049
2050 return true;
2051 }
2052
2053 \f
2054 /* Look through the relocs for a section during the first phase, and
2055 allocate space in the global offset table or procedure linkage
2056 table. */
2057
2058 static boolean
2059 ppc_elf_check_relocs (abfd, info, sec, relocs)
2060 bfd *abfd;
2061 struct bfd_link_info *info;
2062 asection *sec;
2063 const Elf_Internal_Rela *relocs;
2064 {
2065 bfd *dynobj;
2066 Elf_Internal_Shdr *symtab_hdr;
2067 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2068 const Elf_Internal_Rela *rel;
2069 const Elf_Internal_Rela *rel_end;
2070 bfd_signed_vma *local_got_refcounts;
2071 elf_linker_section_t *sdata;
2072 elf_linker_section_t *sdata2;
2073 asection *sreloc;
2074 asection *sgot = NULL;
2075 asection *srelgot = NULL;
2076
2077 if (info->relocateable)
2078 return true;
2079
2080 #ifdef DEBUG
2081 fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n",
2082 bfd_get_section_name (abfd, sec),
2083 bfd_get_filename (abfd));
2084 #endif
2085
2086 /* Create the linker generated sections all the time so that the
2087 special symbols are created. */
2088
2089 if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL)
2090 {
2091 sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2092 if (!sdata)
2093 return false;
2094 }
2095
2096
2097 if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL)
2098 {
2099 sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2);
2100 if (!sdata2)
2101 return false;
2102 }
2103
2104 dynobj = elf_hash_table (info)->dynobj;
2105 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2106 local_got_refcounts = elf_local_got_refcounts (abfd);
2107
2108 sym_hashes = elf_sym_hashes (abfd);
2109 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
2110 if (!elf_bad_symtab (abfd))
2111 sym_hashes_end -= symtab_hdr->sh_info;
2112
2113 sreloc = NULL;
2114
2115 rel_end = relocs + sec->reloc_count;
2116 for (rel = relocs; rel < rel_end; rel++)
2117 {
2118 unsigned long r_symndx;
2119 struct elf_link_hash_entry *h;
2120
2121 r_symndx = ELF32_R_SYM (rel->r_info);
2122 if (r_symndx < symtab_hdr->sh_info)
2123 h = NULL;
2124 else
2125 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2126
2127 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
2128 This shows up in particular in an R_PPC_ADDR32 in the eabi
2129 startup code. */
2130 if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2131 {
2132 if (sgot == NULL)
2133 {
2134 if (dynobj == NULL)
2135 elf_hash_table (info)->dynobj = dynobj = abfd;
2136 if (! _bfd_elf_create_got_section (dynobj, info))
2137 return false;
2138 sgot = bfd_get_section_by_name (dynobj, ".got");
2139 BFD_ASSERT (sgot != NULL);
2140 }
2141 }
2142
2143 switch (ELF32_R_TYPE (rel->r_info))
2144 {
2145 /* GOT16 relocations */
2146 case R_PPC_GOT16:
2147 case R_PPC_GOT16_LO:
2148 case R_PPC_GOT16_HI:
2149 case R_PPC_GOT16_HA:
2150 /* This symbol requires a global offset table entry. */
2151
2152 if (sgot == NULL)
2153 {
2154 if (dynobj == NULL)
2155 elf_hash_table (info)->dynobj = dynobj = abfd;
2156 if (! _bfd_elf_create_got_section (dynobj, info))
2157 return false;
2158 sgot = bfd_get_section_by_name (dynobj, ".got");
2159 BFD_ASSERT (sgot != NULL);
2160 }
2161
2162 if (srelgot == NULL
2163 && (h != NULL || info->shared))
2164 {
2165 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2166 if (srelgot == NULL)
2167 {
2168 srelgot = bfd_make_section (dynobj, ".rela.got");
2169 if (srelgot == NULL
2170 || ! bfd_set_section_flags (dynobj, srelgot,
2171 (SEC_ALLOC
2172 | SEC_LOAD
2173 | SEC_HAS_CONTENTS
2174 | SEC_IN_MEMORY
2175 | SEC_LINKER_CREATED
2176 | SEC_READONLY))
2177 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2178 return false;
2179 }
2180 }
2181
2182 if (h != NULL)
2183 {
2184 if (h->got.refcount == -1)
2185 {
2186 /* Make sure this symbol is output as a dynamic symbol. */
2187 if (h->dynindx == -1)
2188 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2189 return false;
2190
2191 /* Allocate space in the .got. */
2192 sgot->_raw_size += 4;
2193 /* Allocate relocation space. */
2194 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2195
2196 h->got.refcount = 1;
2197 }
2198 else
2199 h->got.refcount++;
2200 }
2201 else
2202 {
2203 /* This is a global offset table entry for a local symbol. */
2204 if (local_got_refcounts == NULL)
2205 {
2206 size_t size;
2207
2208 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
2209 local_got_refcounts = (bfd_signed_vma *)
2210 bfd_alloc (abfd, size);
2211 if (local_got_refcounts == NULL)
2212 return false;
2213 elf_local_got_refcounts (abfd) = local_got_refcounts;
2214 memset (local_got_refcounts, -1, size);
2215 }
2216 if (local_got_refcounts[r_symndx] == -1)
2217 {
2218 sgot->_raw_size += 4;
2219
2220 /* If we are generating a shared object, we need to
2221 output a R_PPC_RELATIVE reloc so that the
2222 dynamic linker can adjust this GOT entry. */
2223 if (info->shared)
2224 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2225
2226 local_got_refcounts[r_symndx] = 1;
2227 }
2228 else
2229 local_got_refcounts[r_symndx]++;
2230 }
2231 break;
2232
2233 /* Indirect .sdata relocation */
2234 case R_PPC_EMB_SDAI16:
2235 if (info->shared)
2236 {
2237 ((*_bfd_error_handler)
2238 (_("%s: relocation %s cannot be used when making a shared object"),
2239 bfd_get_filename (abfd), "R_PPC_EMB_SDAI16"));
2240 return false;
2241 }
2242
2243 if (srelgot == NULL && (h != NULL || info->shared))
2244 {
2245 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2246 if (srelgot == NULL)
2247 {
2248 srelgot = bfd_make_section (dynobj, ".rela.got");
2249 if (srelgot == NULL
2250 || ! bfd_set_section_flags (dynobj, srelgot,
2251 (SEC_ALLOC
2252 | SEC_LOAD
2253 | SEC_HAS_CONTENTS
2254 | SEC_IN_MEMORY
2255 | SEC_LINKER_CREATED
2256 | SEC_READONLY))
2257 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2258 return false;
2259 }
2260 }
2261
2262 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel))
2263 return false;
2264
2265 break;
2266
2267 /* Indirect .sdata2 relocation */
2268 case R_PPC_EMB_SDA2I16:
2269 if (info->shared)
2270 {
2271 ((*_bfd_error_handler)
2272 (_("%s: relocation %s cannot be used when making a shared object"),
2273 bfd_get_filename (abfd), "R_PPC_EMB_SDA2I16"));
2274 return false;
2275 }
2276
2277 if (srelgot == NULL && (h != NULL || info->shared))
2278 {
2279 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2280 if (srelgot == NULL)
2281 {
2282 srelgot = bfd_make_section (dynobj, ".rela.got");
2283 if (srelgot == NULL
2284 || ! bfd_set_section_flags (dynobj, srelgot,
2285 (SEC_ALLOC
2286 | SEC_LOAD
2287 | SEC_HAS_CONTENTS
2288 | SEC_IN_MEMORY
2289 | SEC_LINKER_CREATED
2290 | SEC_READONLY))
2291 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2292 return false;
2293 }
2294 }
2295
2296 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel))
2297 return false;
2298
2299 break;
2300
2301 case R_PPC_SDAREL16:
2302 case R_PPC_EMB_SDA2REL:
2303 case R_PPC_EMB_SDA21:
2304 if (info->shared)
2305 {
2306 ((*_bfd_error_handler)
2307 (_("%s: relocation %s cannot be used when making a shared object"),
2308 bfd_get_filename (abfd),
2309 ppc_elf_howto_table[(int)ELF32_R_TYPE (rel->r_info)]->name));
2310 return false;
2311 }
2312 break;
2313
2314 case R_PPC_PLT32:
2315 case R_PPC_PLTREL24:
2316 case R_PPC_PLT16_LO:
2317 case R_PPC_PLT16_HI:
2318 case R_PPC_PLT16_HA:
2319 #ifdef DEBUG
2320 fprintf (stderr, "Reloc requires a PLT entry\n");
2321 #endif
2322 /* This symbol requires a procedure linkage table entry. We
2323 actually build the entry in adjust_dynamic_symbol,
2324 because this might be a case of linking PIC code without
2325 linking in any dynamic objects, in which case we don't
2326 need to generate a procedure linkage table after all. */
2327
2328 if (h == NULL)
2329 {
2330 /* It does not make sense to have a procedure linkage
2331 table entry for a local symbol. */
2332 bfd_set_error (bfd_error_bad_value);
2333 return false;
2334 }
2335
2336 /* Make sure this symbol is output as a dynamic symbol. */
2337 if (h->dynindx == -1)
2338 {
2339 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2340 return false;
2341 }
2342 if (h->plt.refcount == -1)
2343 {
2344 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2345 h->plt.refcount = 1;
2346 }
2347 else
2348 h->plt.refcount++;
2349 break;
2350
2351 /* The following relocations don't need to propagate the
2352 relocation if linking a shared object since they are
2353 section relative. */
2354 case R_PPC_SECTOFF:
2355 case R_PPC_SECTOFF_LO:
2356 case R_PPC_SECTOFF_HI:
2357 case R_PPC_SECTOFF_HA:
2358 break;
2359
2360 /* This refers only to functions defined in the shared library */
2361 case R_PPC_LOCAL24PC:
2362 break;
2363
2364 /* This relocation describes the C++ object vtable hierarchy.
2365 Reconstruct it for later use during GC. */
2366 case R_PPC_GNU_VTINHERIT:
2367 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2368 return false;
2369 break;
2370
2371 /* This relocation describes which C++ vtable entries are actually
2372 used. Record for later use during GC. */
2373 case R_PPC_GNU_VTENTRY:
2374 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2375 return false;
2376 break;
2377
2378 /* When creating a shared object, we must copy these
2379 relocs into the output file. We create a reloc
2380 section in dynobj and make room for the reloc. */
2381 case R_PPC_REL24:
2382 case R_PPC_REL14:
2383 case R_PPC_REL14_BRTAKEN:
2384 case R_PPC_REL14_BRNTAKEN:
2385 case R_PPC_REL32:
2386 if (h == NULL
2387 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2388 break;
2389 /* fall through */
2390
2391 default:
2392 if (info->shared)
2393 {
2394 #ifdef DEBUG
2395 fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n",
2396 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
2397 #endif
2398 if (sreloc == NULL)
2399 {
2400 const char *name;
2401
2402 name = (bfd_elf_string_from_elf_section
2403 (abfd,
2404 elf_elfheader (abfd)->e_shstrndx,
2405 elf_section_data (sec)->rel_hdr.sh_name));
2406 if (name == NULL)
2407 return false;
2408
2409 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2410 && strcmp (bfd_get_section_name (abfd, sec),
2411 name + 5) == 0);
2412
2413 sreloc = bfd_get_section_by_name (dynobj, name);
2414 if (sreloc == NULL)
2415 {
2416 flagword flags;
2417
2418 sreloc = bfd_make_section (dynobj, name);
2419 flags = (SEC_HAS_CONTENTS | SEC_READONLY
2420 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2421 if ((sec->flags & SEC_ALLOC) != 0)
2422 flags |= SEC_ALLOC | SEC_LOAD;
2423 if (sreloc == NULL
2424 || ! bfd_set_section_flags (dynobj, sreloc, flags)
2425 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
2426 return false;
2427 }
2428 }
2429
2430 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2431
2432 /* FIXME: We should here do what the m68k and i386
2433 backends do: if the reloc is pc-relative, record it
2434 in case it turns out that the reloc is unnecessary
2435 because the symbol is forced local by versioning or
2436 we are linking with -Bdynamic. Fortunately this
2437 case is not frequent. */
2438 }
2439
2440 break;
2441 }
2442 }
2443
2444 return true;
2445 }
2446
2447 /* Return the section that should be marked against GC for a given
2448 relocation. */
2449
2450 static asection *
2451 ppc_elf_gc_mark_hook (abfd, info, rel, h, sym)
2452 bfd *abfd;
2453 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2454 Elf_Internal_Rela *rel;
2455 struct elf_link_hash_entry *h;
2456 Elf_Internal_Sym *sym;
2457 {
2458 if (h != NULL)
2459 {
2460 switch (ELF32_R_TYPE (rel->r_info))
2461 {
2462 case R_PPC_GNU_VTINHERIT:
2463 case R_PPC_GNU_VTENTRY:
2464 break;
2465
2466 default:
2467 switch (h->root.type)
2468 {
2469 case bfd_link_hash_defined:
2470 case bfd_link_hash_defweak:
2471 return h->root.u.def.section;
2472
2473 case bfd_link_hash_common:
2474 return h->root.u.c.p->section;
2475
2476 default:
2477 break;
2478 }
2479 }
2480 }
2481 else
2482 {
2483 if (!(elf_bad_symtab (abfd)
2484 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
2485 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
2486 && sym->st_shndx != SHN_COMMON))
2487 {
2488 return bfd_section_from_elf_index (abfd, sym->st_shndx);
2489 }
2490 }
2491
2492 return NULL;
2493 }
2494
2495 /* Update the got entry reference counts for the section being removed. */
2496
2497 static boolean
2498 ppc_elf_gc_sweep_hook (abfd, info, sec, relocs)
2499 bfd *abfd;
2500 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2501 asection *sec;
2502 const Elf_Internal_Rela *relocs;
2503 {
2504 Elf_Internal_Shdr *symtab_hdr;
2505 struct elf_link_hash_entry **sym_hashes;
2506 bfd_signed_vma *local_got_refcounts;
2507 const Elf_Internal_Rela *rel, *relend;
2508 unsigned long r_symndx;
2509 struct elf_link_hash_entry *h;
2510
2511 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2512 sym_hashes = elf_sym_hashes (abfd);
2513 local_got_refcounts = elf_local_got_refcounts (abfd);
2514
2515 relend = relocs + sec->reloc_count;
2516 for (rel = relocs; rel < relend; rel++)
2517 switch (ELF32_R_TYPE (rel->r_info))
2518 {
2519 case R_PPC_GOT16:
2520 case R_PPC_GOT16_LO:
2521 case R_PPC_GOT16_HI:
2522 case R_PPC_GOT16_HA:
2523 r_symndx = ELF32_R_SYM (rel->r_info);
2524 if (r_symndx >= symtab_hdr->sh_info)
2525 {
2526 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2527 if (h->got.refcount > 0)
2528 h->got.refcount--;
2529 }
2530 else if (local_got_refcounts != NULL)
2531 {
2532 if (local_got_refcounts[r_symndx] > 0)
2533 local_got_refcounts[r_symndx]--;
2534 }
2535 break;
2536
2537 case R_PPC_PLT32:
2538 case R_PPC_PLTREL24:
2539 case R_PPC_PLT16_LO:
2540 case R_PPC_PLT16_HI:
2541 case R_PPC_PLT16_HA:
2542 r_symndx = ELF32_R_SYM (rel->r_info);
2543 if (r_symndx >= symtab_hdr->sh_info)
2544 {
2545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2546 if (h->plt.refcount > 0)
2547 h->plt.refcount--;
2548 }
2549 break;
2550
2551 default:
2552 break;
2553 }
2554
2555 return true;
2556 }
2557 \f
2558 /* Hook called by the linker routine which adds symbols from an object
2559 file. We use it to put .comm items in .sbss, and not .bss. */
2560
2561 /*ARGSUSED*/
2562 static boolean
2563 ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
2564 bfd *abfd;
2565 struct bfd_link_info *info;
2566 const Elf_Internal_Sym *sym;
2567 const char **namep ATTRIBUTE_UNUSED;
2568 flagword *flagsp ATTRIBUTE_UNUSED;
2569 asection **secp;
2570 bfd_vma *valp;
2571 {
2572 if (sym->st_shndx == SHN_COMMON
2573 && !info->relocateable
2574 && sym->st_size <= (bfd_vma) bfd_get_gp_size (abfd))
2575 {
2576 /* Common symbols less than or equal to -G nn bytes are automatically
2577 put into .sdata. */
2578 elf_linker_section_t *sdata
2579 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2580
2581 if (!sdata->bss_section)
2582 {
2583 /* We don't go through bfd_make_section, because we don't
2584 want to attach this common section to DYNOBJ. The linker
2585 will move the symbols to the appropriate output section
2586 when it defines common symbols. */
2587 sdata->bss_section = ((asection *)
2588 bfd_zalloc (abfd, sizeof (asection)));
2589 if (sdata->bss_section == NULL)
2590 return false;
2591 sdata->bss_section->name = sdata->bss_name;
2592 sdata->bss_section->flags = SEC_IS_COMMON;
2593 sdata->bss_section->output_section = sdata->bss_section;
2594 sdata->bss_section->symbol =
2595 (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
2596 sdata->bss_section->symbol_ptr_ptr =
2597 (asymbol **) bfd_zalloc (abfd, sizeof (asymbol *));
2598 if (sdata->bss_section->symbol == NULL
2599 || sdata->bss_section->symbol_ptr_ptr == NULL)
2600 return false;
2601 sdata->bss_section->symbol->name = sdata->bss_name;
2602 sdata->bss_section->symbol->flags = BSF_SECTION_SYM;
2603 sdata->bss_section->symbol->section = sdata->bss_section;
2604 *sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol;
2605 }
2606
2607 *secp = sdata->bss_section;
2608 *valp = sym->st_size;
2609 }
2610
2611 return true;
2612 }
2613
2614 \f
2615 /* Finish up dynamic symbol handling. We set the contents of various
2616 dynamic sections here. */
2617
2618 static boolean
2619 ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym)
2620 bfd *output_bfd;
2621 struct bfd_link_info *info;
2622 struct elf_link_hash_entry *h;
2623 Elf_Internal_Sym *sym;
2624 {
2625 bfd *dynobj;
2626
2627 #ifdef DEBUG
2628 fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s",
2629 h->root.root.string);
2630 #endif
2631
2632 dynobj = elf_hash_table (info)->dynobj;
2633 BFD_ASSERT (dynobj != NULL);
2634
2635 if (h->plt.offset != (bfd_vma) -1)
2636 {
2637 asection *splt;
2638 asection *srela;
2639 Elf_Internal_Rela rela;
2640 bfd_vma reloc_index;
2641
2642 #ifdef DEBUG
2643 fprintf (stderr, ", plt_offset = %d", h->plt.offset);
2644 #endif
2645
2646 /* This symbol has an entry in the procedure linkage table. Set
2647 it up. */
2648
2649 BFD_ASSERT (h->dynindx != -1);
2650
2651 splt = bfd_get_section_by_name (dynobj, ".plt");
2652 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
2653 BFD_ASSERT (splt != NULL && srela != NULL);
2654
2655 /* We don't need to fill in the .plt. The ppc dynamic linker
2656 will fill it in. */
2657
2658 /* Fill in the entry in the .rela.plt section. */
2659 rela.r_offset = (splt->output_section->vma
2660 + splt->output_offset
2661 + h->plt.offset);
2662 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT);
2663 rela.r_addend = 0;
2664
2665 reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE;
2666 if (reloc_index > PLT_NUM_SINGLE_ENTRIES)
2667 reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2;
2668 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2669 ((Elf32_External_Rela *) srela->contents
2670 + reloc_index));
2671
2672 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2673 {
2674 /* Mark the symbol as undefined, rather than as defined in
2675 the .plt section. Leave the value alone. */
2676 sym->st_shndx = SHN_UNDEF;
2677 }
2678 }
2679
2680 if (h->got.offset != (bfd_vma) -1)
2681 {
2682 asection *sgot;
2683 asection *srela;
2684 Elf_Internal_Rela rela;
2685
2686 /* This symbol has an entry in the global offset table. Set it
2687 up. */
2688
2689 sgot = bfd_get_section_by_name (dynobj, ".got");
2690 srela = bfd_get_section_by_name (dynobj, ".rela.got");
2691 BFD_ASSERT (sgot != NULL && srela != NULL);
2692
2693 rela.r_offset = (sgot->output_section->vma
2694 + sgot->output_offset
2695 + (h->got.offset &~ 1));
2696
2697 /* If this is a -Bsymbolic link, and the symbol is defined
2698 locally, we just want to emit a RELATIVE reloc. The entry in
2699 the global offset table will already have been initialized in
2700 the relocate_section function. */
2701 if (info->shared
2702 && (info->symbolic || h->dynindx == -1)
2703 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2704 {
2705 rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
2706 rela.r_addend = (h->root.u.def.value
2707 + h->root.u.def.section->output_section->vma
2708 + h->root.u.def.section->output_offset);
2709 }
2710 else
2711 {
2712 BFD_ASSERT((h->got.offset & 1) == 0);
2713 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
2714 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT);
2715 rela.r_addend = 0;
2716 }
2717
2718 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2719 ((Elf32_External_Rela *) srela->contents
2720 + srela->reloc_count));
2721 ++srela->reloc_count;
2722 }
2723
2724 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2725 {
2726 asection *s;
2727 Elf_Internal_Rela rela;
2728
2729 /* This symbols needs a copy reloc. Set it up. */
2730
2731 #ifdef DEBUG
2732 fprintf (stderr, ", copy");
2733 #endif
2734
2735 BFD_ASSERT (h->dynindx != -1);
2736
2737 if (h->size <= elf_gp_size (dynobj))
2738 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2739 ".rela.sbss");
2740 else
2741 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2742 ".rela.bss");
2743 BFD_ASSERT (s != NULL);
2744
2745 rela.r_offset = (h->root.u.def.value
2746 + h->root.u.def.section->output_section->vma
2747 + h->root.u.def.section->output_offset);
2748 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY);
2749 rela.r_addend = 0;
2750 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2751 ((Elf32_External_Rela *) s->contents
2752 + s->reloc_count));
2753 ++s->reloc_count;
2754 }
2755
2756 #ifdef DEBUG
2757 fprintf (stderr, "\n");
2758 #endif
2759
2760 /* Mark some specially defined symbols as absolute. */
2761 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2762 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2763 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2764 sym->st_shndx = SHN_ABS;
2765
2766 return true;
2767 }
2768
2769 \f
2770 /* Finish up the dynamic sections. */
2771
2772 static boolean
2773 ppc_elf_finish_dynamic_sections (output_bfd, info)
2774 bfd *output_bfd;
2775 struct bfd_link_info *info;
2776 {
2777 asection *sdyn;
2778 bfd *dynobj = elf_hash_table (info)->dynobj;
2779 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
2780
2781 #ifdef DEBUG
2782 fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n");
2783 #endif
2784
2785 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2786
2787 if (elf_hash_table (info)->dynamic_sections_created)
2788 {
2789 asection *splt;
2790 Elf32_External_Dyn *dyncon, *dynconend;
2791
2792 splt = bfd_get_section_by_name (dynobj, ".plt");
2793 BFD_ASSERT (splt != NULL && sdyn != NULL);
2794
2795 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2796 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2797 for (; dyncon < dynconend; dyncon++)
2798 {
2799 Elf_Internal_Dyn dyn;
2800 const char *name;
2801 boolean size;
2802
2803 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2804
2805 switch (dyn.d_tag)
2806 {
2807 case DT_PLTGOT: name = ".plt"; size = false; break;
2808 case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
2809 case DT_JMPREL: name = ".rela.plt"; size = false; break;
2810 default: name = NULL; size = false; break;
2811 }
2812
2813 if (name != NULL)
2814 {
2815 asection *s;
2816
2817 s = bfd_get_section_by_name (output_bfd, name);
2818 if (s == NULL)
2819 dyn.d_un.d_val = 0;
2820 else
2821 {
2822 if (! size)
2823 dyn.d_un.d_ptr = s->vma;
2824 else
2825 {
2826 if (s->_cooked_size != 0)
2827 dyn.d_un.d_val = s->_cooked_size;
2828 else
2829 dyn.d_un.d_val = s->_raw_size;
2830 }
2831 }
2832 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2833 }
2834 }
2835 }
2836
2837 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
2838 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
2839 if (sgot)
2840 {
2841 unsigned char *contents = sgot->contents;
2842 bfd_put_32 (output_bfd, 0x4e800021 /* blrl */, contents);
2843
2844 if (sdyn == NULL)
2845 bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
2846 else
2847 bfd_put_32 (output_bfd,
2848 sdyn->output_section->vma + sdyn->output_offset,
2849 contents+4);
2850
2851 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2852 }
2853
2854 return true;
2855 }
2856
2857 \f
2858 /* The RELOCATE_SECTION function is called by the ELF backend linker
2859 to handle the relocations for a section.
2860
2861 The relocs are always passed as Rela structures; if the section
2862 actually uses Rel structures, the r_addend field will always be
2863 zero.
2864
2865 This function is responsible for adjust the section contents as
2866 necessary, and (if using Rela relocs and generating a
2867 relocateable output file) adjusting the reloc addend as
2868 necessary.
2869
2870 This function does not have to worry about setting the reloc
2871 address or the reloc symbol index.
2872
2873 LOCAL_SYMS is a pointer to the swapped in local symbols.
2874
2875 LOCAL_SECTIONS is an array giving the section in the input file
2876 corresponding to the st_shndx field of each local symbol.
2877
2878 The global hash table entry for the global symbols can be found
2879 via elf_sym_hashes (input_bfd).
2880
2881 When generating relocateable output, this function must handle
2882 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
2883 going to be the section symbol corresponding to the output
2884 section, which means that the addend must be adjusted
2885 accordingly. */
2886
2887 static boolean
2888 ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
2889 contents, relocs, local_syms, local_sections)
2890 bfd *output_bfd;
2891 struct bfd_link_info *info;
2892 bfd *input_bfd;
2893 asection *input_section;
2894 bfd_byte *contents;
2895 Elf_Internal_Rela *relocs;
2896 Elf_Internal_Sym *local_syms;
2897 asection **local_sections;
2898 {
2899 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2900 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
2901 bfd *dynobj = elf_hash_table (info)->dynobj;
2902 elf_linker_section_t *sdata = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA) : NULL;
2903 elf_linker_section_t *sdata2 = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA2) : NULL;
2904 Elf_Internal_Rela *rel = relocs;
2905 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
2906 asection *sreloc = NULL;
2907 asection *splt;
2908 asection *sgot;
2909 bfd_vma *local_got_offsets;
2910 boolean ret = true;
2911 long insn;
2912
2913 #ifdef DEBUG
2914 fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n",
2915 bfd_get_filename (input_bfd),
2916 bfd_section_name(input_bfd, input_section),
2917 (long)input_section->reloc_count,
2918 (info->relocateable) ? " (relocatable)" : "");
2919 #endif
2920
2921 if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */
2922 ppc_elf_howto_init ();
2923
2924 local_got_offsets = elf_local_got_offsets (input_bfd);
2925
2926 splt = sgot = NULL;
2927 if (dynobj != NULL)
2928 {
2929 splt = bfd_get_section_by_name (dynobj, ".plt");
2930 sgot = bfd_get_section_by_name (dynobj, ".got");
2931 }
2932
2933 for (; rel < relend; rel++)
2934 {
2935 enum elf_ppc_reloc_type r_type = (enum elf_ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
2936 bfd_vma offset = rel->r_offset;
2937 bfd_vma addend = rel->r_addend;
2938 bfd_reloc_status_type r = bfd_reloc_other;
2939 Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0;
2940 asection *sec = (asection *)0;
2941 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0;
2942 const char *sym_name = (const char *)0;
2943 reloc_howto_type *howto;
2944 unsigned long r_symndx;
2945 bfd_vma relocation;
2946
2947 /* Unknown relocation handling */
2948 if ((unsigned)r_type >= (unsigned)R_PPC_max || !ppc_elf_howto_table[(int)r_type])
2949 {
2950 (*_bfd_error_handler) (_("%s: unknown relocation type %d"),
2951 bfd_get_filename (input_bfd),
2952 (int)r_type);
2953
2954 bfd_set_error (bfd_error_bad_value);
2955 ret = false;
2956 continue;
2957 }
2958
2959 howto = ppc_elf_howto_table[(int)r_type];
2960 r_symndx = ELF32_R_SYM (rel->r_info);
2961
2962 if (info->relocateable)
2963 {
2964 /* This is a relocateable link. We don't have to change
2965 anything, unless the reloc is against a section symbol,
2966 in which case we have to adjust according to where the
2967 section symbol winds up in the output section. */
2968 if (r_symndx < symtab_hdr->sh_info)
2969 {
2970 sym = local_syms + r_symndx;
2971 if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2972 {
2973 sec = local_sections[r_symndx];
2974 addend = rel->r_addend += sec->output_offset + sym->st_value;
2975 }
2976 }
2977
2978 #ifdef DEBUG
2979 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
2980 howto->name,
2981 (int)r_type,
2982 r_symndx,
2983 (long)offset,
2984 (long)addend);
2985 #endif
2986 continue;
2987 }
2988
2989 /* This is a final link. */
2990 if (r_symndx < symtab_hdr->sh_info)
2991 {
2992 sym = local_syms + r_symndx;
2993 sec = local_sections[r_symndx];
2994 sym_name = "<local symbol>";
2995
2996 relocation = (sec->output_section->vma
2997 + sec->output_offset
2998 + sym->st_value);
2999 }
3000 else
3001 {
3002 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3003 while (h->root.type == bfd_link_hash_indirect
3004 || h->root.type == bfd_link_hash_warning)
3005 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3006 sym_name = h->root.root.string;
3007 if (h->root.type == bfd_link_hash_defined
3008 || h->root.type == bfd_link_hash_defweak)
3009 {
3010 sec = h->root.u.def.section;
3011 if ((r_type == R_PPC_PLT32
3012 && splt != NULL
3013 && h->plt.offset != (bfd_vma) -1)
3014 || (r_type == R_PPC_LOCAL24PC
3015 && sec->output_section == NULL)
3016 || ((r_type == R_PPC_GOT16
3017 || r_type == R_PPC_GOT16_LO
3018 || r_type == R_PPC_GOT16_HI
3019 || r_type == R_PPC_GOT16_HA)
3020 && elf_hash_table (info)->dynamic_sections_created
3021 && (! info->shared
3022 || (! info->symbolic && h->dynindx != -1)
3023 || (h->elf_link_hash_flags
3024 & ELF_LINK_HASH_DEF_REGULAR) == 0))
3025 || (info->shared
3026 && ((! info->symbolic && h->dynindx != -1)
3027 || (h->elf_link_hash_flags
3028 & ELF_LINK_HASH_DEF_REGULAR) == 0)
3029 && ((input_section->flags & SEC_ALLOC) != 0
3030 /* Testing SEC_DEBUGGING here may be wrong.
3031 It's here to avoid a crash when
3032 generating a shared library with DWARF
3033 debugging information. */
3034 || ((input_section->flags & SEC_DEBUGGING) != 0
3035 && (h->elf_link_hash_flags
3036 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
3037 && (r_type == R_PPC_ADDR32
3038 || r_type == R_PPC_ADDR24
3039 || r_type == R_PPC_ADDR16
3040 || r_type == R_PPC_ADDR16_LO
3041 || r_type == R_PPC_ADDR16_HI
3042 || r_type == R_PPC_ADDR16_HA
3043 || r_type == R_PPC_ADDR14
3044 || r_type == R_PPC_ADDR14_BRTAKEN
3045 || r_type == R_PPC_ADDR14_BRNTAKEN
3046 || r_type == R_PPC_PLTREL24
3047 || r_type == R_PPC_COPY
3048 || r_type == R_PPC_GLOB_DAT
3049 || r_type == R_PPC_JMP_SLOT
3050 || r_type == R_PPC_UADDR32
3051 || r_type == R_PPC_UADDR16
3052 || r_type == R_PPC_SDAREL16
3053 || r_type == R_PPC_EMB_NADDR32
3054 || r_type == R_PPC_EMB_NADDR16
3055 || r_type == R_PPC_EMB_NADDR16_LO
3056 || r_type == R_PPC_EMB_NADDR16_HI
3057 || r_type == R_PPC_EMB_NADDR16_HA
3058 || r_type == R_PPC_EMB_SDAI16
3059 || r_type == R_PPC_EMB_SDA2I16
3060 || r_type == R_PPC_EMB_SDA2REL
3061 || r_type == R_PPC_EMB_SDA21
3062 || r_type == R_PPC_EMB_MRKREF
3063 || r_type == R_PPC_EMB_BIT_FLD
3064 || r_type == R_PPC_EMB_RELSDA
3065 || ((r_type == R_PPC_REL24
3066 || r_type == R_PPC_REL32
3067 || r_type == R_PPC_REL14
3068 || r_type == R_PPC_REL14_BRTAKEN
3069 || r_type == R_PPC_REL14_BRNTAKEN
3070 || r_type == R_PPC_RELATIVE)
3071 && strcmp (h->root.root.string,
3072 "_GLOBAL_OFFSET_TABLE_") != 0))))
3073 {
3074 /* In these cases, we don't need the relocation
3075 value. We check specially because in some
3076 obscure cases sec->output_section will be NULL. */
3077 relocation = 0;
3078 }
3079 else if (sec->output_section == NULL)
3080 {
3081 (*_bfd_error_handler)
3082 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
3083 bfd_get_filename (input_bfd), h->root.root.string,
3084 bfd_get_section_name (input_bfd, input_section));
3085 relocation = 0;
3086 }
3087 else
3088 relocation = (h->root.u.def.value
3089 + sec->output_section->vma
3090 + sec->output_offset);
3091 }
3092 else if (h->root.type == bfd_link_hash_undefweak)
3093 relocation = 0;
3094 else if (info->shared && !info->symbolic
3095 && !info->no_undefined
3096 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
3097 relocation = 0;
3098 else
3099 {
3100 if (! (*info->callbacks->undefined_symbol)(info,
3101 h->root.root.string,
3102 input_bfd,
3103 input_section,
3104 rel->r_offset,
3105 (!info->shared
3106 || info->no_undefined
3107 || ELF_ST_VISIBILITY (h->other))))
3108 return false;
3109 relocation = 0;
3110 }
3111 }
3112
3113 switch ((int)r_type)
3114 {
3115 default:
3116 (*_bfd_error_handler) (_("%s: unknown relocation type %d for symbol %s"),
3117 bfd_get_filename (input_bfd),
3118 (int)r_type, sym_name);
3119
3120 bfd_set_error (bfd_error_bad_value);
3121 ret = false;
3122 continue;
3123
3124 /* Relocations that need no special processing. */
3125 case (int)R_PPC_LOCAL24PC:
3126 /* It makes no sense to point a local relocation
3127 at a symbol not in this object. */
3128 if (h != NULL
3129 && (h->root.type == bfd_link_hash_defined
3130 || h->root.type == bfd_link_hash_defweak)
3131 && sec->output_section == NULL)
3132 {
3133 if (! (*info->callbacks->undefined_symbol) (info,
3134 h->root.root.string,
3135 input_bfd,
3136 input_section,
3137 rel->r_offset,
3138 true))
3139 return false;
3140 continue;
3141 }
3142 break;
3143
3144 /* Relocations that may need to be propagated if this is a shared
3145 object. */
3146 case (int)R_PPC_REL24:
3147 case (int)R_PPC_REL32:
3148 case (int)R_PPC_REL14:
3149 /* If these relocations are not to a named symbol, they can be
3150 handled right here, no need to bother the dynamic linker. */
3151 if (h == NULL
3152 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3153 break;
3154 /* fall through */
3155
3156 /* Relocations that always need to be propagated if this is a shared
3157 object. */
3158 case (int)R_PPC_NONE:
3159 case (int)R_PPC_ADDR32:
3160 case (int)R_PPC_ADDR24:
3161 case (int)R_PPC_ADDR16:
3162 case (int)R_PPC_ADDR16_LO:
3163 case (int)R_PPC_ADDR16_HI:
3164 case (int)R_PPC_ADDR16_HA:
3165 case (int)R_PPC_ADDR14:
3166 case (int)R_PPC_UADDR32:
3167 case (int)R_PPC_UADDR16:
3168 if (info->shared)
3169 {
3170 Elf_Internal_Rela outrel;
3171 boolean skip;
3172
3173 #ifdef DEBUG
3174 fprintf (stderr, "ppc_elf_relocate_section need to create relocation for %s\n",
3175 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
3176 #endif
3177
3178 /* When generating a shared object, these relocations
3179 are copied into the output file to be resolved at run
3180 time. */
3181
3182 if (sreloc == NULL)
3183 {
3184 const char *name;
3185
3186 name = (bfd_elf_string_from_elf_section
3187 (input_bfd,
3188 elf_elfheader (input_bfd)->e_shstrndx,
3189 elf_section_data (input_section)->rel_hdr.sh_name));
3190 if (name == NULL)
3191 return false;
3192
3193 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
3194 && strcmp (bfd_get_section_name (input_bfd,
3195 input_section),
3196 name + 5) == 0);
3197
3198 sreloc = bfd_get_section_by_name (dynobj, name);
3199 BFD_ASSERT (sreloc != NULL);
3200 }
3201
3202 skip = false;
3203
3204 if (elf_section_data (input_section)->stab_info == NULL)
3205 outrel.r_offset = rel->r_offset;
3206 else
3207 {
3208 bfd_vma off;
3209
3210 off = (_bfd_stab_section_offset
3211 (output_bfd, &elf_hash_table (info)->stab_info,
3212 input_section,
3213 &elf_section_data (input_section)->stab_info,
3214 rel->r_offset));
3215 if (off == (bfd_vma) -1)
3216 skip = true;
3217 outrel.r_offset = off;
3218 }
3219
3220 outrel.r_offset += (input_section->output_section->vma
3221 + input_section->output_offset);
3222
3223 if (skip)
3224 memset (&outrel, 0, sizeof outrel);
3225 /* h->dynindx may be -1 if this symbol was marked to
3226 become local. */
3227 else if (h != NULL
3228 && ((! info->symbolic && h->dynindx != -1)
3229 || (h->elf_link_hash_flags
3230 & ELF_LINK_HASH_DEF_REGULAR) == 0))
3231 {
3232 BFD_ASSERT (h->dynindx != -1);
3233 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3234 outrel.r_addend = rel->r_addend;
3235 }
3236 else
3237 {
3238 if (r_type == R_PPC_ADDR32)
3239 {
3240 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3241 outrel.r_addend = relocation + rel->r_addend;
3242 }
3243 else
3244 {
3245 long indx;
3246
3247 if (h == NULL)
3248 sec = local_sections[r_symndx];
3249 else
3250 {
3251 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3252 || (h->root.type
3253 == bfd_link_hash_defweak));
3254 sec = h->root.u.def.section;
3255 }
3256 if (sec != NULL && bfd_is_abs_section (sec))
3257 indx = 0;
3258 else if (sec == NULL || sec->owner == NULL)
3259 {
3260 bfd_set_error (bfd_error_bad_value);
3261 return false;
3262 }
3263 else
3264 {
3265 asection *osec;
3266
3267 osec = sec->output_section;
3268 indx = elf_section_data (osec)->dynindx;
3269 BFD_ASSERT(indx > 0);
3270 #ifdef DEBUG
3271 if (indx <= 0)
3272 {
3273 printf("indx=%d section=%s flags=%08x name=%s\n",
3274 indx, osec->name, osec->flags,
3275 h->root.root.string);
3276 }
3277 #endif
3278 }
3279
3280 outrel.r_info = ELF32_R_INFO (indx, r_type);
3281 outrel.r_addend = relocation + rel->r_addend;
3282 }
3283 }
3284
3285 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
3286 (((Elf32_External_Rela *)
3287 sreloc->contents)
3288 + sreloc->reloc_count));
3289 ++sreloc->reloc_count;
3290
3291 /* This reloc will be computed at runtime, so there's no
3292 need to do anything now, unless this is a RELATIVE
3293 reloc in an unallocated section. */
3294 if (skip
3295 || (input_section->flags & SEC_ALLOC) != 0
3296 || ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE)
3297 continue;
3298 }
3299
3300 /* Arithmetic adjust relocations that aren't going into a
3301 shared object. */
3302 if (r_type == R_PPC_ADDR16_HA
3303 /* It's just possible that this symbol is a weak symbol
3304 that's not actually defined anywhere. In that case,
3305 'sec' would be NULL, and we should leave the symbol
3306 alone (it will be set to zero elsewhere in the link). */
3307 && sec != NULL)
3308 {
3309 addend += ((relocation + addend) & 0x8000) << 1;
3310 }
3311 break;
3312
3313 /* branch taken prediction relocations */
3314 case (int)R_PPC_ADDR14_BRTAKEN:
3315 case (int)R_PPC_REL14_BRTAKEN:
3316 insn = bfd_get_32 (output_bfd, contents + offset);
3317 if ((relocation - offset) & 0x8000)
3318 insn &= ~BRANCH_PREDICT_BIT;
3319 else
3320 insn |= BRANCH_PREDICT_BIT;
3321 bfd_put_32 (output_bfd, insn, contents + offset);
3322 break;
3323
3324 /* branch not taken predicition relocations */
3325 case (int)R_PPC_ADDR14_BRNTAKEN:
3326 case (int)R_PPC_REL14_BRNTAKEN:
3327 insn = bfd_get_32 (output_bfd, contents + offset);
3328 if ((relocation - offset) & 0x8000)
3329 insn |= BRANCH_PREDICT_BIT;
3330 else
3331 insn &= ~BRANCH_PREDICT_BIT;
3332 bfd_put_32 (output_bfd, insn, contents + offset);
3333 break;
3334
3335 /* GOT16 relocations */
3336 case (int)R_PPC_GOT16:
3337 case (int)R_PPC_GOT16_LO:
3338 case (int)R_PPC_GOT16_HI:
3339 case (int)R_PPC_GOT16_HA:
3340 /* Relocation is to the entry for this symbol in the global
3341 offset table. */
3342 BFD_ASSERT (sgot != NULL);
3343
3344 if (h != NULL)
3345 {
3346 bfd_vma off;
3347
3348 off = h->got.offset;
3349 BFD_ASSERT (off != (bfd_vma) -1);
3350
3351 if (! elf_hash_table (info)->dynamic_sections_created
3352 || (info->shared
3353 && (info->symbolic || h->dynindx == -1)
3354 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
3355 {
3356 /* This is actually a static link, or it is a
3357 -Bsymbolic link and the symbol is defined
3358 locally. We must initialize this entry in the
3359 global offset table. Since the offset must
3360 always be a multiple of 4, we use the least
3361 significant bit to record whether we have
3362 initialized it already.
3363
3364 When doing a dynamic link, we create a .rela.got
3365 relocation entry to initialize the value. This
3366 is done in the finish_dynamic_symbol routine. */
3367 if ((off & 1) != 0)
3368 off &= ~1;
3369 else
3370 {
3371 bfd_put_32 (output_bfd, relocation,
3372 sgot->contents + off);
3373 h->got.offset |= 1;
3374 }
3375 }
3376
3377 relocation = sgot->output_offset + off - 4;
3378 }
3379 else
3380 {
3381 bfd_vma off;
3382
3383 BFD_ASSERT (local_got_offsets != NULL
3384 && local_got_offsets[r_symndx] != (bfd_vma) -1);
3385
3386 off = local_got_offsets[r_symndx];
3387
3388 /* The offset must always be a multiple of 4. We use
3389 the least significant bit to record whether we have
3390 already processed this entry. */
3391 if ((off & 1) != 0)
3392 off &= ~1;
3393 else
3394 {
3395 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
3396
3397 if (info->shared)
3398 {
3399 asection *srelgot;
3400 Elf_Internal_Rela outrel;
3401
3402 /* We need to generate a R_PPC_RELATIVE reloc
3403 for the dynamic linker. */
3404 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
3405 BFD_ASSERT (srelgot != NULL);
3406
3407 outrel.r_offset = (sgot->output_section->vma
3408 + sgot->output_offset
3409 + off);
3410 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3411 outrel.r_addend = relocation;
3412 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
3413 (((Elf32_External_Rela *)
3414 srelgot->contents)
3415 + srelgot->reloc_count));
3416 ++srelgot->reloc_count;
3417 }
3418
3419 local_got_offsets[r_symndx] |= 1;
3420 }
3421
3422 relocation = sgot->output_offset + off - 4;
3423 }
3424 break;
3425
3426 /* Indirect .sdata relocation */
3427 case (int)R_PPC_EMB_SDAI16:
3428 BFD_ASSERT (sdata != NULL);
3429 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3430 sdata, h, relocation, rel,
3431 R_PPC_RELATIVE);
3432 break;
3433
3434 /* Indirect .sdata2 relocation */
3435 case (int)R_PPC_EMB_SDA2I16:
3436 BFD_ASSERT (sdata2 != NULL);
3437 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3438 sdata2, h, relocation, rel,
3439 R_PPC_RELATIVE);
3440 break;
3441
3442 /* Handle the TOC16 reloc. We want to use the offset within the .got
3443 section, not the actual VMA. This is appropriate when generating
3444 an embedded ELF object, for which the .got section acts like the
3445 AIX .toc section. */
3446 case (int)R_PPC_TOC16: /* phony GOT16 relocations */
3447 BFD_ASSERT (sec != (asection *)0);
3448 BFD_ASSERT (bfd_is_und_section (sec)
3449 || strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
3450 || strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0)
3451
3452 addend -= sec->output_section->vma + sec->output_offset + 0x8000;
3453 break;
3454
3455 case (int)R_PPC_PLTREL24:
3456 /* Relocation is to the entry for this symbol in the
3457 procedure linkage table. */
3458 BFD_ASSERT (h != NULL);
3459
3460 if (h->plt.offset == (bfd_vma) -1
3461 || splt == NULL)
3462 {
3463 /* We didn't make a PLT entry for this symbol. This
3464 happens when statically linking PIC code, or when
3465 using -Bsymbolic. */
3466 break;
3467 }
3468
3469 relocation = (splt->output_section->vma
3470 + splt->output_offset
3471 + h->plt.offset);
3472 break;
3473
3474 /* relocate against _SDA_BASE_ */
3475 case (int)R_PPC_SDAREL16:
3476 {
3477 const char *name;
3478
3479 BFD_ASSERT (sec != (asection *)0);
3480 name = bfd_get_section_name (abfd, sec->output_section);
3481 if (strcmp (name, ".sdata") != 0
3482 && strcmp (name, ".sbss") != 0)
3483 {
3484 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3485 bfd_get_filename (input_bfd),
3486 sym_name,
3487 ppc_elf_howto_table[ (int)r_type ]->name,
3488 name);
3489 }
3490 addend -= (sdata->sym_hash->root.u.def.value
3491 + sdata->sym_hash->root.u.def.section->output_section->vma
3492 + sdata->sym_hash->root.u.def.section->output_offset);
3493 }
3494 break;
3495
3496
3497 /* relocate against _SDA2_BASE_ */
3498 case (int)R_PPC_EMB_SDA2REL:
3499 {
3500 const char *name;
3501
3502 BFD_ASSERT (sec != (asection *)0);
3503 name = bfd_get_section_name (abfd, sec->output_section);
3504 if (strcmp (name, ".sdata2") != 0 && strcmp (name, ".sbss2") != 0)
3505 {
3506 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3507 bfd_get_filename (input_bfd),
3508 sym_name,
3509 ppc_elf_howto_table[ (int)r_type ]->name,
3510 name);
3511
3512 bfd_set_error (bfd_error_bad_value);
3513 ret = false;
3514 continue;
3515 }
3516 addend -= (sdata2->sym_hash->root.u.def.value
3517 + sdata2->sym_hash->root.u.def.section->output_section->vma
3518 + sdata2->sym_hash->root.u.def.section->output_offset);
3519 }
3520 break;
3521
3522
3523 /* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */
3524 case (int)R_PPC_EMB_SDA21:
3525 case (int)R_PPC_EMB_RELSDA:
3526 {
3527 const char *name;
3528 int reg;
3529
3530 BFD_ASSERT (sec != (asection *)0);
3531 name = bfd_get_section_name (abfd, sec->output_section);
3532 if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0)
3533 {
3534 reg = 13;
3535 addend -= (sdata->sym_hash->root.u.def.value
3536 + sdata->sym_hash->root.u.def.section->output_section->vma
3537 + sdata->sym_hash->root.u.def.section->output_offset);
3538 }
3539
3540 else if (strcmp (name, ".sdata2") == 0 || strcmp (name, ".sbss2") == 0)
3541 {
3542 reg = 2;
3543 addend -= (sdata2->sym_hash->root.u.def.value
3544 + sdata2->sym_hash->root.u.def.section->output_section->vma
3545 + sdata2->sym_hash->root.u.def.section->output_offset);
3546 }
3547
3548 else if (strcmp (name, ".PPC.EMB.sdata0") == 0 || strcmp (name, ".PPC.EMB.sbss0") == 0)
3549 {
3550 reg = 0;
3551 }
3552
3553 else
3554 {
3555 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3556 bfd_get_filename (input_bfd),
3557 sym_name,
3558 ppc_elf_howto_table[ (int)r_type ]->name,
3559 name);
3560
3561 bfd_set_error (bfd_error_bad_value);
3562 ret = false;
3563 continue;
3564 }
3565
3566 if (r_type == R_PPC_EMB_SDA21)
3567 { /* fill in register field */
3568 insn = bfd_get_32 (output_bfd, contents + offset);
3569 insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT);
3570 bfd_put_32 (output_bfd, insn, contents + offset);
3571 }
3572 }
3573 break;
3574
3575 /* Relocate against the beginning of the section */
3576 case (int)R_PPC_SECTOFF:
3577 case (int)R_PPC_SECTOFF_LO:
3578 case (int)R_PPC_SECTOFF_HI:
3579 BFD_ASSERT (sec != (asection *)0);
3580 addend -= sec->output_section->vma;
3581 break;
3582
3583 case (int)R_PPC_SECTOFF_HA:
3584 BFD_ASSERT (sec != (asection *)0);
3585 addend -= sec->output_section->vma;
3586 addend += ((relocation + addend) & 0x8000) << 1;
3587 break;
3588
3589 /* Negative relocations */
3590 case (int)R_PPC_EMB_NADDR32:
3591 case (int)R_PPC_EMB_NADDR16:
3592 case (int)R_PPC_EMB_NADDR16_LO:
3593 case (int)R_PPC_EMB_NADDR16_HI:
3594 addend -= 2*relocation;
3595 break;
3596
3597 case (int)R_PPC_EMB_NADDR16_HA:
3598 addend -= 2*relocation;
3599 addend += ((relocation + addend) & 0x8000) << 1;
3600 break;
3601
3602 /* NOP relocation that prevents garbage collecting linkers from omitting a
3603 reference. */
3604 case (int)R_PPC_EMB_MRKREF:
3605 continue;
3606
3607 case (int)R_PPC_COPY:
3608 case (int)R_PPC_GLOB_DAT:
3609 case (int)R_PPC_JMP_SLOT:
3610 case (int)R_PPC_RELATIVE:
3611 case (int)R_PPC_PLT32:
3612 case (int)R_PPC_PLTREL32:
3613 case (int)R_PPC_PLT16_LO:
3614 case (int)R_PPC_PLT16_HI:
3615 case (int)R_PPC_PLT16_HA:
3616 case (int)R_PPC_EMB_RELSEC16:
3617 case (int)R_PPC_EMB_RELST_LO:
3618 case (int)R_PPC_EMB_RELST_HI:
3619 case (int)R_PPC_EMB_RELST_HA:
3620 case (int)R_PPC_EMB_BIT_FLD:
3621 (*_bfd_error_handler) (_("%s: Relocation %s is not yet supported for symbol %s."),
3622 bfd_get_filename (input_bfd),
3623 ppc_elf_howto_table[ (int)r_type ]->name,
3624 sym_name);
3625
3626 bfd_set_error (bfd_error_invalid_operation);
3627 ret = false;
3628 continue;
3629
3630 case (int)R_PPC_GNU_VTINHERIT:
3631 case (int)R_PPC_GNU_VTENTRY:
3632 /* These are no-ops in the end. */
3633 continue;
3634 }
3635
3636
3637 #ifdef DEBUG
3638 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
3639 howto->name,
3640 (int)r_type,
3641 sym_name,
3642 r_symndx,
3643 (long)offset,
3644 (long)addend);
3645 #endif
3646
3647 r = _bfd_final_link_relocate (howto,
3648 input_bfd,
3649 input_section,
3650 contents,
3651 offset,
3652 relocation,
3653 addend);
3654
3655 if (r == bfd_reloc_ok)
3656 ;
3657 else if (r == bfd_reloc_overflow)
3658 {
3659 const char *name;
3660
3661 if (h != NULL)
3662 {
3663 if (h->root.type == bfd_link_hash_undefweak
3664 && howto->pc_relative)
3665 {
3666 /* Assume this is a call protected by other code that
3667 detect the symbol is undefined. If this is the case,
3668 we can safely ignore the overflow. If not, the
3669 program is hosed anyway, and a little warning isn't
3670 going to help. */
3671
3672 continue;
3673 }
3674
3675 name = h->root.root.string;
3676 }
3677 else
3678 {
3679 name = bfd_elf_string_from_elf_section (input_bfd,
3680 symtab_hdr->sh_link,
3681 sym->st_name);
3682 if (name == NULL)
3683 continue;
3684 if (*name == '\0')
3685 name = bfd_section_name (input_bfd, sec);
3686 }
3687
3688 if (! (*info->callbacks->reloc_overflow)(info,
3689 name,
3690 howto->name,
3691 (bfd_vma) 0,
3692 input_bfd,
3693 input_section,
3694 offset))
3695 return false;
3696 }
3697 else
3698 ret = false;
3699 }
3700
3701 #ifdef DEBUG
3702 fprintf (stderr, "\n");
3703 #endif
3704
3705 return ret;
3706 }
3707
3708 \f
3709 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
3710 #define TARGET_LITTLE_NAME "elf32-powerpcle"
3711 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
3712 #define TARGET_BIG_NAME "elf32-powerpc"
3713 #define ELF_ARCH bfd_arch_powerpc
3714 #define ELF_MACHINE_CODE EM_PPC
3715 #define ELF_MAXPAGESIZE 0x10000
3716 #define elf_info_to_howto ppc_elf_info_to_howto
3717
3718 #ifdef EM_CYGNUS_POWERPC
3719 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
3720 #endif
3721
3722 #ifdef EM_PPC_OLD
3723 #define ELF_MACHINE_ALT2 EM_PPC_OLD
3724 #endif
3725
3726 #define elf_backend_plt_not_loaded 1
3727 #define elf_backend_got_symbol_offset 4
3728 #define elf_backend_can_gc_sections 1
3729 #define elf_backend_got_header_size 12
3730 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
3731
3732 #define bfd_elf32_bfd_copy_private_bfd_data ppc_elf_copy_private_bfd_data
3733 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
3734 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
3735 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
3736 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
3737 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
3738
3739 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
3740 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
3741 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
3742 #define elf_backend_relocate_section ppc_elf_relocate_section
3743 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
3744 #define elf_backend_check_relocs ppc_elf_check_relocs
3745 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
3746 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
3747 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
3748 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
3749 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
3750 #define elf_backend_fake_sections ppc_elf_fake_sections
3751 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
3752 #define elf_backend_modify_segment_map ppc_elf_modify_segment_map
3753
3754 #include "elf32-target.h"
git-cvsimport of binutils cvsroot