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Support for more than 64k ELF sections.
[binutils.git] / bfd / elf32-ppc.c
blob15172c695a7e81ba15119ff50a278c4c9bbf38c6
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 /* This file is based on a preliminary PowerPC ELF ABI. The
23 information may not match the final PowerPC ELF ABI. It includes
24 suggestions from the in-progress Embedded PowerPC ABI, and that
25 information may also not match. */
26
27 #include "bfd.h"
28 #include "sysdep.h"
29 #include "bfdlink.h"
30 #include "libbfd.h"
31 #include "elf-bfd.h"
32 #include "elf/ppc.h"
33
34 #define USE_RELA /* we want RELA relocations, not REL */
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 int ppc_elf_sort_rela PARAMS ((const PTR, const PTR));
42 static boolean ppc_elf_relax_section
43 PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *));
44 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
45 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
46 static boolean ppc_elf_set_private_flags PARAMS ((bfd *, flagword));
47 static boolean ppc_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *));
48 static boolean ppc_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
49
50 static int ppc_elf_additional_program_headers PARAMS ((bfd *));
51 static boolean ppc_elf_modify_segment_map PARAMS ((bfd *));
52
53 static boolean ppc_elf_create_dynamic_sections
54 PARAMS ((bfd *, struct bfd_link_info *));
55
56 static boolean ppc_elf_section_from_shdr PARAMS ((bfd *,
57 Elf32_Internal_Shdr *,
58 char *));
59 static boolean ppc_elf_fake_sections
60 PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *));
61
62 static elf_linker_section_t *ppc_elf_create_linker_section
63 PARAMS ((bfd *abfd,
64 struct bfd_link_info *info,
65 enum elf_linker_section_enum));
66
67 static boolean ppc_elf_check_relocs PARAMS ((bfd *,
68 struct bfd_link_info *,
69 asection *,
70 const Elf_Internal_Rela *));
71
72 static asection * ppc_elf_gc_mark_hook PARAMS ((bfd *abfd,
73 struct bfd_link_info *info,
74 Elf_Internal_Rela *rel,
75 struct elf_link_hash_entry *h,
76 Elf_Internal_Sym *sym));
77
78 static boolean ppc_elf_gc_sweep_hook PARAMS ((bfd *abfd,
79 struct bfd_link_info *info,
80 asection *sec,
81 const Elf_Internal_Rela *relocs));
82
83 static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *,
84 struct elf_link_hash_entry *));
85
86 static boolean ppc_elf_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
87
88 static boolean ppc_elf_relocate_section PARAMS ((bfd *,
89 struct bfd_link_info *info,
90 bfd *,
91 asection *,
92 bfd_byte *,
93 Elf_Internal_Rela *relocs,
94 Elf_Internal_Sym *local_syms,
95 asection **));
96
97 static boolean ppc_elf_add_symbol_hook PARAMS ((bfd *,
98 struct bfd_link_info *,
99 const Elf_Internal_Sym *,
100 const char **,
101 flagword *,
102 asection **,
103 bfd_vma *));
104
105 static boolean ppc_elf_finish_dynamic_symbol PARAMS ((bfd *,
106 struct bfd_link_info *,
107 struct elf_link_hash_entry *,
108 Elf_Internal_Sym *));
109
110 static boolean ppc_elf_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
111 static enum elf_reloc_type_class ppc_elf_reloc_type_class
112 PARAMS ((const Elf_Internal_Rela *));
113 static boolean ppc_elf_grok_prstatus
114 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
115 static boolean ppc_elf_grok_psinfo
116 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
117
118 #define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */
119 #define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */
120 #define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */
121
122 /* The name of the dynamic interpreter. This is put in the .interp
123 section. */
124
125 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
126
127 /* The size in bytes of an entry in the procedure linkage table. */
128 #define PLT_ENTRY_SIZE 12
129 /* The initial size of the plt reserved for the dynamic linker. */
130 #define PLT_INITIAL_ENTRY_SIZE 72
131 /* The size of the gap between entries in the PLT. */
132 #define PLT_SLOT_SIZE 8
133 /* The number of single-slot PLT entries (the rest use two slots). */
134 #define PLT_NUM_SINGLE_ENTRIES 8192
135
136 /* Will references to this symbol always reference the symbol
137 in this object? */
138 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
139 ((! INFO->shared \
140 || INFO->symbolic \
141 || H->dynindx == -1 \
142 || ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \
143 || ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \
144 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
145
146 /* Will _calls_ to this symbol always call the version in this object? */
147 #define SYMBOL_CALLS_LOCAL(INFO, H) \
148 ((! INFO->shared \
149 || INFO->symbolic \
150 || H->dynindx == -1 \
151 || ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \
152 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
153 \f
154 static reloc_howto_type *ppc_elf_howto_table[(int) R_PPC_max];
155
156 static reloc_howto_type ppc_elf_howto_raw[] = {
157 /* This reloc does nothing. */
158 HOWTO (R_PPC_NONE, /* type */
159 0, /* rightshift */
160 2, /* size (0 = byte, 1 = short, 2 = long) */
161 32, /* bitsize */
162 false, /* pc_relative */
163 0, /* bitpos */
164 complain_overflow_bitfield, /* complain_on_overflow */
165 bfd_elf_generic_reloc, /* special_function */
166 "R_PPC_NONE", /* name */
167 false, /* partial_inplace */
168 0, /* src_mask */
169 0, /* dst_mask */
170 false), /* pcrel_offset */
171
172 /* A standard 32 bit relocation. */
173 HOWTO (R_PPC_ADDR32, /* type */
174 0, /* rightshift */
175 2, /* size (0 = byte, 1 = short, 2 = long) */
176 32, /* bitsize */
177 false, /* pc_relative */
178 0, /* bitpos */
179 complain_overflow_bitfield, /* complain_on_overflow */
180 bfd_elf_generic_reloc, /* special_function */
181 "R_PPC_ADDR32", /* name */
182 false, /* partial_inplace */
183 0, /* src_mask */
184 0xffffffff, /* dst_mask */
185 false), /* pcrel_offset */
186
187 /* An absolute 26 bit branch; the lower two bits must be zero.
188 FIXME: we don't check that, we just clear them. */
189 HOWTO (R_PPC_ADDR24, /* type */
190 0, /* rightshift */
191 2, /* size (0 = byte, 1 = short, 2 = long) */
192 26, /* bitsize */
193 false, /* pc_relative */
194 0, /* bitpos */
195 complain_overflow_bitfield, /* complain_on_overflow */
196 bfd_elf_generic_reloc, /* special_function */
197 "R_PPC_ADDR24", /* name */
198 false, /* partial_inplace */
199 0, /* src_mask */
200 0x3fffffc, /* dst_mask */
201 false), /* pcrel_offset */
202
203 /* A standard 16 bit relocation. */
204 HOWTO (R_PPC_ADDR16, /* type */
205 0, /* rightshift */
206 1, /* size (0 = byte, 1 = short, 2 = long) */
207 16, /* bitsize */
208 false, /* pc_relative */
209 0, /* bitpos */
210 complain_overflow_bitfield, /* complain_on_overflow */
211 bfd_elf_generic_reloc, /* special_function */
212 "R_PPC_ADDR16", /* name */
213 false, /* partial_inplace */
214 0, /* src_mask */
215 0xffff, /* dst_mask */
216 false), /* pcrel_offset */
217
218 /* A 16 bit relocation without overflow. */
219 HOWTO (R_PPC_ADDR16_LO, /* type */
220 0, /* rightshift */
221 1, /* size (0 = byte, 1 = short, 2 = long) */
222 16, /* bitsize */
223 false, /* pc_relative */
224 0, /* bitpos */
225 complain_overflow_dont,/* complain_on_overflow */
226 bfd_elf_generic_reloc, /* special_function */
227 "R_PPC_ADDR16_LO", /* name */
228 false, /* partial_inplace */
229 0, /* src_mask */
230 0xffff, /* dst_mask */
231 false), /* pcrel_offset */
232
233 /* The high order 16 bits of an address. */
234 HOWTO (R_PPC_ADDR16_HI, /* type */
235 16, /* rightshift */
236 1, /* size (0 = byte, 1 = short, 2 = long) */
237 16, /* bitsize */
238 false, /* pc_relative */
239 0, /* bitpos */
240 complain_overflow_dont, /* complain_on_overflow */
241 bfd_elf_generic_reloc, /* special_function */
242 "R_PPC_ADDR16_HI", /* name */
243 false, /* partial_inplace */
244 0, /* src_mask */
245 0xffff, /* dst_mask */
246 false), /* pcrel_offset */
247
248 /* The high order 16 bits of an address, plus 1 if the contents of
249 the low 16 bits, treated as a signed number, is negative. */
250 HOWTO (R_PPC_ADDR16_HA, /* type */
251 16, /* rightshift */
252 1, /* size (0 = byte, 1 = short, 2 = long) */
253 16, /* bitsize */
254 false, /* pc_relative */
255 0, /* bitpos */
256 complain_overflow_dont, /* complain_on_overflow */
257 ppc_elf_addr16_ha_reloc, /* special_function */
258 "R_PPC_ADDR16_HA", /* name */
259 false, /* partial_inplace */
260 0, /* src_mask */
261 0xffff, /* dst_mask */
262 false), /* pcrel_offset */
263
264 /* An absolute 16 bit branch; the lower two bits must be zero.
265 FIXME: we don't check that, we just clear them. */
266 HOWTO (R_PPC_ADDR14, /* type */
267 0, /* rightshift */
268 2, /* size (0 = byte, 1 = short, 2 = long) */
269 16, /* bitsize */
270 false, /* pc_relative */
271 0, /* bitpos */
272 complain_overflow_bitfield, /* complain_on_overflow */
273 bfd_elf_generic_reloc, /* special_function */
274 "R_PPC_ADDR14", /* name */
275 false, /* partial_inplace */
276 0, /* src_mask */
277 0xfffc, /* dst_mask */
278 false), /* pcrel_offset */
279
280 /* An absolute 16 bit branch, for which bit 10 should be set to
281 indicate that the branch is expected to be taken. The lower two
282 bits must be zero. */
283 HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */
284 0, /* rightshift */
285 2, /* size (0 = byte, 1 = short, 2 = long) */
286 16, /* bitsize */
287 false, /* pc_relative */
288 0, /* bitpos */
289 complain_overflow_bitfield, /* complain_on_overflow */
290 bfd_elf_generic_reloc, /* special_function */
291 "R_PPC_ADDR14_BRTAKEN",/* name */
292 false, /* partial_inplace */
293 0, /* src_mask */
294 0xfffc, /* dst_mask */
295 false), /* pcrel_offset */
296
297 /* An absolute 16 bit branch, for which bit 10 should be set to
298 indicate that the branch is not expected to be taken. The lower
299 two bits must be zero. */
300 HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */
301 0, /* rightshift */
302 2, /* size (0 = byte, 1 = short, 2 = long) */
303 16, /* bitsize */
304 false, /* pc_relative */
305 0, /* bitpos */
306 complain_overflow_bitfield, /* complain_on_overflow */
307 bfd_elf_generic_reloc, /* special_function */
308 "R_PPC_ADDR14_BRNTAKEN",/* name */
309 false, /* partial_inplace */
310 0, /* src_mask */
311 0xfffc, /* dst_mask */
312 false), /* pcrel_offset */
313
314 /* A relative 26 bit branch; the lower two bits must be zero. */
315 HOWTO (R_PPC_REL24, /* type */
316 0, /* rightshift */
317 2, /* size (0 = byte, 1 = short, 2 = long) */
318 26, /* bitsize */
319 true, /* pc_relative */
320 0, /* bitpos */
321 complain_overflow_signed, /* complain_on_overflow */
322 bfd_elf_generic_reloc, /* special_function */
323 "R_PPC_REL24", /* name */
324 false, /* partial_inplace */
325 0, /* src_mask */
326 0x3fffffc, /* dst_mask */
327 true), /* pcrel_offset */
328
329 /* A relative 16 bit branch; the lower two bits must be zero. */
330 HOWTO (R_PPC_REL14, /* type */
331 0, /* rightshift */
332 2, /* size (0 = byte, 1 = short, 2 = long) */
333 16, /* bitsize */
334 true, /* pc_relative */
335 0, /* bitpos */
336 complain_overflow_signed, /* complain_on_overflow */
337 bfd_elf_generic_reloc, /* special_function */
338 "R_PPC_REL14", /* name */
339 false, /* partial_inplace */
340 0, /* src_mask */
341 0xfffc, /* dst_mask */
342 true), /* pcrel_offset */
343
344 /* A relative 16 bit branch. Bit 10 should be set to indicate that
345 the branch is expected to be taken. The lower two bits must be
346 zero. */
347 HOWTO (R_PPC_REL14_BRTAKEN, /* type */
348 0, /* rightshift */
349 2, /* size (0 = byte, 1 = short, 2 = long) */
350 16, /* bitsize */
351 true, /* pc_relative */
352 0, /* bitpos */
353 complain_overflow_signed, /* complain_on_overflow */
354 bfd_elf_generic_reloc, /* special_function */
355 "R_PPC_REL14_BRTAKEN", /* name */
356 false, /* partial_inplace */
357 0, /* src_mask */
358 0xfffc, /* dst_mask */
359 true), /* pcrel_offset */
360
361 /* A relative 16 bit branch. Bit 10 should be set to indicate that
362 the branch is not expected to be taken. The lower two bits must
363 be zero. */
364 HOWTO (R_PPC_REL14_BRNTAKEN, /* type */
365 0, /* rightshift */
366 2, /* size (0 = byte, 1 = short, 2 = long) */
367 16, /* bitsize */
368 true, /* pc_relative */
369 0, /* bitpos */
370 complain_overflow_signed, /* complain_on_overflow */
371 bfd_elf_generic_reloc, /* special_function */
372 "R_PPC_REL14_BRNTAKEN",/* name */
373 false, /* partial_inplace */
374 0, /* src_mask */
375 0xfffc, /* dst_mask */
376 true), /* pcrel_offset */
377
378 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
379 symbol. */
380 HOWTO (R_PPC_GOT16, /* type */
381 0, /* rightshift */
382 1, /* size (0 = byte, 1 = short, 2 = long) */
383 16, /* bitsize */
384 false, /* pc_relative */
385 0, /* bitpos */
386 complain_overflow_signed, /* complain_on_overflow */
387 bfd_elf_generic_reloc, /* special_function */
388 "R_PPC_GOT16", /* name */
389 false, /* partial_inplace */
390 0, /* src_mask */
391 0xffff, /* dst_mask */
392 false), /* pcrel_offset */
393
394 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
395 the symbol. */
396 HOWTO (R_PPC_GOT16_LO, /* type */
397 0, /* rightshift */
398 1, /* size (0 = byte, 1 = short, 2 = long) */
399 16, /* bitsize */
400 false, /* pc_relative */
401 0, /* bitpos */
402 complain_overflow_dont, /* complain_on_overflow */
403 bfd_elf_generic_reloc, /* special_function */
404 "R_PPC_GOT16_LO", /* name */
405 false, /* partial_inplace */
406 0, /* src_mask */
407 0xffff, /* dst_mask */
408 false), /* pcrel_offset */
409
410 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
411 the symbol. */
412 HOWTO (R_PPC_GOT16_HI, /* type */
413 16, /* rightshift */
414 1, /* size (0 = byte, 1 = short, 2 = long) */
415 16, /* bitsize */
416 false, /* pc_relative */
417 0, /* bitpos */
418 complain_overflow_bitfield, /* complain_on_overflow */
419 bfd_elf_generic_reloc, /* special_function */
420 "R_PPC_GOT16_HI", /* name */
421 false, /* partial_inplace */
422 0, /* src_mask */
423 0xffff, /* dst_mask */
424 false), /* pcrel_offset */
425
426 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
427 the symbol. */
428 HOWTO (R_PPC_GOT16_HA, /* type */
429 16, /* rightshift */
430 1, /* size (0 = byte, 1 = short, 2 = long) */
431 16, /* bitsize */
432 false, /* pc_relative */
433 0, /* bitpos */
434 complain_overflow_bitfield, /* complain_on_overflow */
435 ppc_elf_addr16_ha_reloc, /* special_function */
436 "R_PPC_GOT16_HA", /* name */
437 false, /* partial_inplace */
438 0, /* src_mask */
439 0xffff, /* dst_mask */
440 false), /* pcrel_offset */
441
442 /* Like R_PPC_REL24, but referring to the procedure linkage table
443 entry for the symbol. */
444 HOWTO (R_PPC_PLTREL24, /* type */
445 0, /* rightshift */
446 2, /* size (0 = byte, 1 = short, 2 = long) */
447 26, /* bitsize */
448 true, /* pc_relative */
449 0, /* bitpos */
450 complain_overflow_signed, /* complain_on_overflow */
451 bfd_elf_generic_reloc, /* special_function */
452 "R_PPC_PLTREL24", /* name */
453 false, /* partial_inplace */
454 0, /* src_mask */
455 0x3fffffc, /* dst_mask */
456 true), /* pcrel_offset */
457
458 /* This is used only by the dynamic linker. The symbol should exist
459 both in the object being run and in some shared library. The
460 dynamic linker copies the data addressed by the symbol from the
461 shared library into the object, because the object being
462 run has to have the data at some particular address. */
463 HOWTO (R_PPC_COPY, /* type */
464 0, /* rightshift */
465 2, /* size (0 = byte, 1 = short, 2 = long) */
466 32, /* bitsize */
467 false, /* pc_relative */
468 0, /* bitpos */
469 complain_overflow_bitfield, /* complain_on_overflow */
470 bfd_elf_generic_reloc, /* special_function */
471 "R_PPC_COPY", /* name */
472 false, /* partial_inplace */
473 0, /* src_mask */
474 0, /* dst_mask */
475 false), /* pcrel_offset */
476
477 /* Like R_PPC_ADDR32, but used when setting global offset table
478 entries. */
479 HOWTO (R_PPC_GLOB_DAT, /* type */
480 0, /* rightshift */
481 2, /* size (0 = byte, 1 = short, 2 = long) */
482 32, /* bitsize */
483 false, /* pc_relative */
484 0, /* bitpos */
485 complain_overflow_bitfield, /* complain_on_overflow */
486 bfd_elf_generic_reloc, /* special_function */
487 "R_PPC_GLOB_DAT", /* name */
488 false, /* partial_inplace */
489 0, /* src_mask */
490 0xffffffff, /* dst_mask */
491 false), /* pcrel_offset */
492
493 /* Marks a procedure linkage table entry for a symbol. */
494 HOWTO (R_PPC_JMP_SLOT, /* type */
495 0, /* rightshift */
496 2, /* size (0 = byte, 1 = short, 2 = long) */
497 32, /* bitsize */
498 false, /* pc_relative */
499 0, /* bitpos */
500 complain_overflow_bitfield, /* complain_on_overflow */
501 bfd_elf_generic_reloc, /* special_function */
502 "R_PPC_JMP_SLOT", /* name */
503 false, /* partial_inplace */
504 0, /* src_mask */
505 0, /* dst_mask */
506 false), /* pcrel_offset */
507
508 /* Used only by the dynamic linker. When the object is run, this
509 longword is set to the load address of the object, plus the
510 addend. */
511 HOWTO (R_PPC_RELATIVE, /* type */
512 0, /* rightshift */
513 2, /* size (0 = byte, 1 = short, 2 = long) */
514 32, /* bitsize */
515 false, /* pc_relative */
516 0, /* bitpos */
517 complain_overflow_bitfield, /* complain_on_overflow */
518 bfd_elf_generic_reloc, /* special_function */
519 "R_PPC_RELATIVE", /* name */
520 false, /* partial_inplace */
521 0, /* src_mask */
522 0xffffffff, /* dst_mask */
523 false), /* pcrel_offset */
524
525 /* Like R_PPC_REL24, but uses the value of the symbol within the
526 object rather than the final value. Normally used for
527 _GLOBAL_OFFSET_TABLE_. */
528 HOWTO (R_PPC_LOCAL24PC, /* type */
529 0, /* rightshift */
530 2, /* size (0 = byte, 1 = short, 2 = long) */
531 26, /* bitsize */
532 true, /* pc_relative */
533 0, /* bitpos */
534 complain_overflow_signed, /* complain_on_overflow */
535 bfd_elf_generic_reloc, /* special_function */
536 "R_PPC_LOCAL24PC", /* name */
537 false, /* partial_inplace */
538 0, /* src_mask */
539 0x3fffffc, /* dst_mask */
540 true), /* pcrel_offset */
541
542 /* Like R_PPC_ADDR32, but may be unaligned. */
543 HOWTO (R_PPC_UADDR32, /* type */
544 0, /* rightshift */
545 2, /* size (0 = byte, 1 = short, 2 = long) */
546 32, /* bitsize */
547 false, /* pc_relative */
548 0, /* bitpos */
549 complain_overflow_bitfield, /* complain_on_overflow */
550 bfd_elf_generic_reloc, /* special_function */
551 "R_PPC_UADDR32", /* name */
552 false, /* partial_inplace */
553 0, /* src_mask */
554 0xffffffff, /* dst_mask */
555 false), /* pcrel_offset */
556
557 /* Like R_PPC_ADDR16, but may be unaligned. */
558 HOWTO (R_PPC_UADDR16, /* type */
559 0, /* rightshift */
560 1, /* size (0 = byte, 1 = short, 2 = long) */
561 16, /* bitsize */
562 false, /* pc_relative */
563 0, /* bitpos */
564 complain_overflow_bitfield, /* complain_on_overflow */
565 bfd_elf_generic_reloc, /* special_function */
566 "R_PPC_UADDR16", /* name */
567 false, /* partial_inplace */
568 0, /* src_mask */
569 0xffff, /* dst_mask */
570 false), /* pcrel_offset */
571
572 /* 32-bit PC relative */
573 HOWTO (R_PPC_REL32, /* type */
574 0, /* rightshift */
575 2, /* size (0 = byte, 1 = short, 2 = long) */
576 32, /* bitsize */
577 true, /* pc_relative */
578 0, /* bitpos */
579 complain_overflow_bitfield, /* complain_on_overflow */
580 bfd_elf_generic_reloc, /* special_function */
581 "R_PPC_REL32", /* name */
582 false, /* partial_inplace */
583 0, /* src_mask */
584 0xffffffff, /* dst_mask */
585 true), /* pcrel_offset */
586
587 /* 32-bit relocation to the symbol's procedure linkage table.
588 FIXME: not supported. */
589 HOWTO (R_PPC_PLT32, /* type */
590 0, /* rightshift */
591 2, /* size (0 = byte, 1 = short, 2 = long) */
592 32, /* bitsize */
593 false, /* pc_relative */
594 0, /* bitpos */
595 complain_overflow_bitfield, /* complain_on_overflow */
596 bfd_elf_generic_reloc, /* special_function */
597 "R_PPC_PLT32", /* name */
598 false, /* partial_inplace */
599 0, /* src_mask */
600 0, /* dst_mask */
601 false), /* pcrel_offset */
602
603 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
604 FIXME: not supported. */
605 HOWTO (R_PPC_PLTREL32, /* type */
606 0, /* rightshift */
607 2, /* size (0 = byte, 1 = short, 2 = long) */
608 32, /* bitsize */
609 true, /* pc_relative */
610 0, /* bitpos */
611 complain_overflow_bitfield, /* complain_on_overflow */
612 bfd_elf_generic_reloc, /* special_function */
613 "R_PPC_PLTREL32", /* name */
614 false, /* partial_inplace */
615 0, /* src_mask */
616 0, /* dst_mask */
617 true), /* pcrel_offset */
618
619 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
620 the symbol. */
621 HOWTO (R_PPC_PLT16_LO, /* type */
622 0, /* rightshift */
623 1, /* size (0 = byte, 1 = short, 2 = long) */
624 16, /* bitsize */
625 false, /* pc_relative */
626 0, /* bitpos */
627 complain_overflow_dont, /* complain_on_overflow */
628 bfd_elf_generic_reloc, /* special_function */
629 "R_PPC_PLT16_LO", /* name */
630 false, /* partial_inplace */
631 0, /* src_mask */
632 0xffff, /* dst_mask */
633 false), /* pcrel_offset */
634
635 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
636 the symbol. */
637 HOWTO (R_PPC_PLT16_HI, /* type */
638 16, /* rightshift */
639 1, /* size (0 = byte, 1 = short, 2 = long) */
640 16, /* bitsize */
641 false, /* pc_relative */
642 0, /* bitpos */
643 complain_overflow_bitfield, /* complain_on_overflow */
644 bfd_elf_generic_reloc, /* special_function */
645 "R_PPC_PLT16_HI", /* name */
646 false, /* partial_inplace */
647 0, /* src_mask */
648 0xffff, /* dst_mask */
649 false), /* pcrel_offset */
650
651 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
652 the symbol. */
653 HOWTO (R_PPC_PLT16_HA, /* type */
654 16, /* rightshift */
655 1, /* size (0 = byte, 1 = short, 2 = long) */
656 16, /* bitsize */
657 false, /* pc_relative */
658 0, /* bitpos */
659 complain_overflow_bitfield, /* complain_on_overflow */
660 ppc_elf_addr16_ha_reloc, /* special_function */
661 "R_PPC_PLT16_HA", /* name */
662 false, /* partial_inplace */
663 0, /* src_mask */
664 0xffff, /* dst_mask */
665 false), /* pcrel_offset */
666
667 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
668 small data items. */
669 HOWTO (R_PPC_SDAREL16, /* type */
670 0, /* rightshift */
671 1, /* size (0 = byte, 1 = short, 2 = long) */
672 16, /* bitsize */
673 false, /* pc_relative */
674 0, /* bitpos */
675 complain_overflow_signed, /* complain_on_overflow */
676 bfd_elf_generic_reloc, /* special_function */
677 "R_PPC_SDAREL16", /* name */
678 false, /* partial_inplace */
679 0, /* src_mask */
680 0xffff, /* dst_mask */
681 false), /* pcrel_offset */
682
683 /* 32-bit section relative relocation. */
684 HOWTO (R_PPC_SECTOFF, /* type */
685 0, /* rightshift */
686 2, /* size (0 = byte, 1 = short, 2 = long) */
687 32, /* bitsize */
688 true, /* pc_relative */
689 0, /* bitpos */
690 complain_overflow_bitfield, /* complain_on_overflow */
691 bfd_elf_generic_reloc, /* special_function */
692 "R_PPC_SECTOFF", /* name */
693 false, /* partial_inplace */
694 0, /* src_mask */
695 0, /* dst_mask */
696 true), /* pcrel_offset */
697
698 /* 16-bit lower half section relative relocation. */
699 HOWTO (R_PPC_SECTOFF_LO, /* type */
700 0, /* rightshift */
701 1, /* size (0 = byte, 1 = short, 2 = long) */
702 16, /* bitsize */
703 false, /* pc_relative */
704 0, /* bitpos */
705 complain_overflow_dont, /* complain_on_overflow */
706 bfd_elf_generic_reloc, /* special_function */
707 "R_PPC_SECTOFF_LO", /* name */
708 false, /* partial_inplace */
709 0, /* src_mask */
710 0xffff, /* dst_mask */
711 false), /* pcrel_offset */
712
713 /* 16-bit upper half section relative relocation. */
714 HOWTO (R_PPC_SECTOFF_HI, /* type */
715 16, /* rightshift */
716 1, /* size (0 = byte, 1 = short, 2 = long) */
717 16, /* bitsize */
718 false, /* pc_relative */
719 0, /* bitpos */
720 complain_overflow_bitfield, /* complain_on_overflow */
721 bfd_elf_generic_reloc, /* special_function */
722 "R_PPC_SECTOFF_HI", /* name */
723 false, /* partial_inplace */
724 0, /* src_mask */
725 0xffff, /* dst_mask */
726 false), /* pcrel_offset */
727
728 /* 16-bit upper half adjusted section relative relocation. */
729 HOWTO (R_PPC_SECTOFF_HA, /* type */
730 16, /* rightshift */
731 1, /* size (0 = byte, 1 = short, 2 = long) */
732 16, /* bitsize */
733 false, /* pc_relative */
734 0, /* bitpos */
735 complain_overflow_bitfield, /* complain_on_overflow */
736 ppc_elf_addr16_ha_reloc, /* special_function */
737 "R_PPC_SECTOFF_HA", /* name */
738 false, /* partial_inplace */
739 0, /* src_mask */
740 0xffff, /* dst_mask */
741 false), /* pcrel_offset */
742
743 /* The remaining relocs are from the Embedded ELF ABI, and are not
744 in the SVR4 ELF ABI. */
745
746 /* 32 bit value resulting from the addend minus the symbol */
747 HOWTO (R_PPC_EMB_NADDR32, /* type */
748 0, /* rightshift */
749 2, /* size (0 = byte, 1 = short, 2 = long) */
750 32, /* bitsize */
751 false, /* pc_relative */
752 0, /* bitpos */
753 complain_overflow_bitfield, /* complain_on_overflow */
754 bfd_elf_generic_reloc, /* special_function */
755 "R_PPC_EMB_NADDR32", /* name */
756 false, /* partial_inplace */
757 0, /* src_mask */
758 0xffffffff, /* dst_mask */
759 false), /* pcrel_offset */
760
761 /* 16 bit value resulting from the addend minus the symbol */
762 HOWTO (R_PPC_EMB_NADDR16, /* type */
763 0, /* rightshift */
764 1, /* size (0 = byte, 1 = short, 2 = long) */
765 16, /* bitsize */
766 false, /* pc_relative */
767 0, /* bitpos */
768 complain_overflow_bitfield, /* complain_on_overflow */
769 bfd_elf_generic_reloc, /* special_function */
770 "R_PPC_EMB_NADDR16", /* name */
771 false, /* partial_inplace */
772 0, /* src_mask */
773 0xffff, /* dst_mask */
774 false), /* pcrel_offset */
775
776 /* 16 bit value resulting from the addend minus the symbol */
777 HOWTO (R_PPC_EMB_NADDR16_LO, /* type */
778 0, /* rightshift */
779 1, /* size (0 = byte, 1 = short, 2 = long) */
780 16, /* bitsize */
781 false, /* pc_relative */
782 0, /* bitpos */
783 complain_overflow_dont,/* complain_on_overflow */
784 bfd_elf_generic_reloc, /* special_function */
785 "R_PPC_EMB_ADDR16_LO", /* name */
786 false, /* partial_inplace */
787 0, /* src_mask */
788 0xffff, /* dst_mask */
789 false), /* pcrel_offset */
790
791 /* The high order 16 bits of the addend minus the symbol */
792 HOWTO (R_PPC_EMB_NADDR16_HI, /* type */
793 16, /* rightshift */
794 1, /* size (0 = byte, 1 = short, 2 = long) */
795 16, /* bitsize */
796 false, /* pc_relative */
797 0, /* bitpos */
798 complain_overflow_dont, /* complain_on_overflow */
799 bfd_elf_generic_reloc, /* special_function */
800 "R_PPC_EMB_NADDR16_HI", /* name */
801 false, /* partial_inplace */
802 0, /* src_mask */
803 0xffff, /* dst_mask */
804 false), /* pcrel_offset */
805
806 /* The high order 16 bits of the result of the addend minus the address,
807 plus 1 if the contents of the low 16 bits, treated as a signed number,
808 is negative. */
809 HOWTO (R_PPC_EMB_NADDR16_HA, /* type */
810 16, /* rightshift */
811 1, /* size (0 = byte, 1 = short, 2 = long) */
812 16, /* bitsize */
813 false, /* pc_relative */
814 0, /* bitpos */
815 complain_overflow_dont, /* complain_on_overflow */
816 ppc_elf_addr16_ha_reloc, /* special_function */
817 "R_PPC_EMB_NADDR16_HA", /* name */
818 false, /* partial_inplace */
819 0, /* src_mask */
820 0xffff, /* dst_mask */
821 false), /* pcrel_offset */
822
823 /* 16 bit value resulting from allocating a 4 byte word to hold an
824 address in the .sdata section, and returning the offset from
825 _SDA_BASE_ for that relocation */
826 HOWTO (R_PPC_EMB_SDAI16, /* type */
827 0, /* rightshift */
828 1, /* size (0 = byte, 1 = short, 2 = long) */
829 16, /* bitsize */
830 false, /* pc_relative */
831 0, /* bitpos */
832 complain_overflow_bitfield, /* complain_on_overflow */
833 bfd_elf_generic_reloc, /* special_function */
834 "R_PPC_EMB_SDAI16", /* name */
835 false, /* partial_inplace */
836 0, /* src_mask */
837 0xffff, /* dst_mask */
838 false), /* pcrel_offset */
839
840 /* 16 bit value resulting from allocating a 4 byte word to hold an
841 address in the .sdata2 section, and returning the offset from
842 _SDA2_BASE_ for that relocation */
843 HOWTO (R_PPC_EMB_SDA2I16, /* type */
844 0, /* rightshift */
845 1, /* size (0 = byte, 1 = short, 2 = long) */
846 16, /* bitsize */
847 false, /* pc_relative */
848 0, /* bitpos */
849 complain_overflow_bitfield, /* complain_on_overflow */
850 bfd_elf_generic_reloc, /* special_function */
851 "R_PPC_EMB_SDA2I16", /* name */
852 false, /* partial_inplace */
853 0, /* src_mask */
854 0xffff, /* dst_mask */
855 false), /* pcrel_offset */
856
857 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
858 small data items. */
859 HOWTO (R_PPC_EMB_SDA2REL, /* type */
860 0, /* rightshift */
861 1, /* size (0 = byte, 1 = short, 2 = long) */
862 16, /* bitsize */
863 false, /* pc_relative */
864 0, /* bitpos */
865 complain_overflow_signed, /* complain_on_overflow */
866 bfd_elf_generic_reloc, /* special_function */
867 "R_PPC_EMB_SDA2REL", /* name */
868 false, /* partial_inplace */
869 0, /* src_mask */
870 0xffff, /* dst_mask */
871 false), /* pcrel_offset */
872
873 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
874 signed offset from the appropriate base, and filling in the register
875 field with the appropriate register (0, 2, or 13). */
876 HOWTO (R_PPC_EMB_SDA21, /* type */
877 0, /* rightshift */
878 2, /* size (0 = byte, 1 = short, 2 = long) */
879 16, /* bitsize */
880 false, /* pc_relative */
881 0, /* bitpos */
882 complain_overflow_signed, /* complain_on_overflow */
883 bfd_elf_generic_reloc, /* special_function */
884 "R_PPC_EMB_SDA21", /* name */
885 false, /* partial_inplace */
886 0, /* src_mask */
887 0xffff, /* dst_mask */
888 false), /* pcrel_offset */
889
890 /* Relocation not handled: R_PPC_EMB_MRKREF */
891 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
892 /* Relocation not handled: R_PPC_EMB_RELST_LO */
893 /* Relocation not handled: R_PPC_EMB_RELST_HI */
894 /* Relocation not handled: R_PPC_EMB_RELST_HA */
895 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
896
897 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
898 in the 16 bit signed offset from the appropriate base, and filling in the
899 register field with the appropriate register (0, 2, or 13). */
900 HOWTO (R_PPC_EMB_RELSDA, /* type */
901 0, /* rightshift */
902 1, /* size (0 = byte, 1 = short, 2 = long) */
903 16, /* bitsize */
904 true, /* pc_relative */
905 0, /* bitpos */
906 complain_overflow_signed, /* complain_on_overflow */
907 bfd_elf_generic_reloc, /* special_function */
908 "R_PPC_EMB_RELSDA", /* name */
909 false, /* partial_inplace */
910 0, /* src_mask */
911 0xffff, /* dst_mask */
912 false), /* pcrel_offset */
913
914 /* GNU extension to record C++ vtable hierarchy */
915 HOWTO (R_PPC_GNU_VTINHERIT, /* type */
916 0, /* rightshift */
917 0, /* size (0 = byte, 1 = short, 2 = long) */
918 0, /* bitsize */
919 false, /* pc_relative */
920 0, /* bitpos */
921 complain_overflow_dont, /* complain_on_overflow */
922 NULL, /* special_function */
923 "R_PPC_GNU_VTINHERIT", /* name */
924 false, /* partial_inplace */
925 0, /* src_mask */
926 0, /* dst_mask */
927 false), /* pcrel_offset */
928
929 /* GNU extension to record C++ vtable member usage */
930 HOWTO (R_PPC_GNU_VTENTRY, /* type */
931 0, /* rightshift */
932 0, /* size (0 = byte, 1 = short, 2 = long) */
933 0, /* bitsize */
934 false, /* pc_relative */
935 0, /* bitpos */
936 complain_overflow_dont, /* complain_on_overflow */
937 NULL, /* special_function */
938 "R_PPC_GNU_VTENTRY", /* name */
939 false, /* partial_inplace */
940 0, /* src_mask */
941 0, /* dst_mask */
942 false), /* pcrel_offset */
943
944 /* Phony reloc to handle AIX style TOC entries */
945 HOWTO (R_PPC_TOC16, /* type */
946 0, /* rightshift */
947 1, /* size (0 = byte, 1 = short, 2 = long) */
948 16, /* bitsize */
949 false, /* pc_relative */
950 0, /* bitpos */
951 complain_overflow_signed, /* complain_on_overflow */
952 bfd_elf_generic_reloc, /* special_function */
953 "R_PPC_TOC16", /* name */
954 false, /* partial_inplace */
955 0, /* src_mask */
956 0xffff, /* dst_mask */
957 false), /* pcrel_offset */
958 };
959 \f
960 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
961
962 static void
963 ppc_elf_howto_init ()
964 {
965 unsigned int i, type;
966
967 for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++)
968 {
969 type = ppc_elf_howto_raw[i].type;
970 BFD_ASSERT (type < sizeof (ppc_elf_howto_table) / sizeof (ppc_elf_howto_table[0]));
971 ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i];
972 }
973 }
974 \f
975 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
976
977 The MPC860, revision C0 or earlier contains a bug in the die.
978 If all of the following conditions are true, the next instruction
979 to be executed *may* be treated as a no-op.
980 1/ A forward branch is executed.
981 2/ The branch is predicted as not taken.
982 3/ The branch is taken.
983 4/ The branch is located in the last 5 words of a page.
984 (The EOP limit is 5 by default but may be specified as any value from 1-10.)
985
986 Our software solution is to detect these problematic branches in a
987 linker pass and modify them as follows:
988 1/ Unconditional branches - Since these are always predicted taken,
989 there is no problem and no action is required.
990 2/ Conditional backward branches - No problem, no action required.
991 3/ Conditional forward branches - Ensure that the "inverse prediction
992 bit" is set (ensure it is predicted taken).
993 4/ Conditional register branches - Ensure that the "y bit" is set
994 (ensure it is predicted taken).
995 */
996
997 /* Sort sections by address. */
998
999 static int
1000 ppc_elf_sort_rela (arg1, arg2)
1001 const PTR arg1;
1002 const PTR arg2;
1003 {
1004 const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1;
1005 const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2;
1006
1007 /* Sort by offset. */
1008 return ((*rela1)->r_offset - (*rela2)->r_offset);
1009 }
1010
1011 static boolean
1012 ppc_elf_relax_section (abfd, isec, link_info, again)
1013 bfd *abfd;
1014 asection *isec;
1015 struct bfd_link_info *link_info;
1016 boolean *again;
1017 {
1018 #define PAGESIZE 0x1000
1019
1020 bfd_byte *contents = NULL;
1021 bfd_byte *free_contents = NULL;
1022 Elf_Internal_Rela *internal_relocs = NULL;
1023 Elf_Internal_Rela *free_relocs = NULL;
1024 Elf_Internal_Rela **rela_comb = NULL;
1025 int comb_curr, comb_count;
1026
1027 /* We never have to do this more than once per input section. */
1028 *again = false;
1029
1030 /* If needed, initialize this section's cooked size. */
1031 if (isec->_cooked_size == 0)
1032 isec->_cooked_size = isec->_raw_size;
1033
1034 /* We're only interested in text sections which overlap the
1035 troublesome area at the end of a page. */
1036 if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size)
1037 {
1038 bfd_vma dot, end_page, end_section;
1039 boolean section_modified;
1040
1041 /* Get the section contents. */
1042 /* Get cached copy if it exists. */
1043 if (elf_section_data (isec)->this_hdr.contents != NULL)
1044 contents = elf_section_data (isec)->this_hdr.contents;
1045 else
1046 {
1047 /* Go get them off disk. */
1048 contents = (bfd_byte *) bfd_malloc (isec->_raw_size);
1049 if (contents == NULL)
1050 goto error_return;
1051 free_contents = contents;
1052
1053 if (! bfd_get_section_contents (abfd, isec, contents,
1054 (file_ptr) 0, isec->_raw_size))
1055 goto error_return;
1056 }
1057
1058 comb_curr = 0;
1059 comb_count = 0;
1060 if (isec->reloc_count)
1061 {
1062 unsigned n;
1063 bfd_size_type amt;
1064
1065 /* Get a copy of the native relocations. */
1066 internal_relocs = _bfd_elf32_link_read_relocs (
1067 abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
1068 link_info->keep_memory);
1069 if (internal_relocs == NULL)
1070 goto error_return;
1071 if (! link_info->keep_memory)
1072 free_relocs = internal_relocs;
1073
1074 /* Setup a faster access method for the reloc info we need. */
1075 amt = isec->reloc_count;
1076 amt *= sizeof (Elf_Internal_Rela*);
1077 rela_comb = (Elf_Internal_Rela**) bfd_malloc (amt);
1078 if (rela_comb == NULL)
1079 goto error_return;
1080 for (n = 0; n < isec->reloc_count; ++n)
1081 {
1082 long r_type;
1083
1084 r_type = ELF32_R_TYPE (internal_relocs[n].r_info);
1085 if (r_type < 0 || r_type >= (int) R_PPC_max)
1086 goto error_return;
1087
1088 /* Prologue constants are sometimes present in the ".text"
1089 sections and they can be identified by their associated relocation.
1090 We don't want to process those words and some others which
1091 can also be identified by their relocations. However, not all
1092 conditional branches will have a relocation so we will
1093 only ignore words that 1) have a reloc, and 2) the reloc
1094 is not applicable to a conditional branch.
1095 The array rela_comb is built here for use in the EOP scan loop. */
1096 switch (r_type)
1097 {
1098 case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */
1099 case R_PPC_REL14: /* relative cond. br. */
1100 case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */
1101 /* We should check the instruction. */
1102 break;
1103 default:
1104 /* The word is not a conditional branch - ignore it. */
1105 rela_comb[comb_count++] = &internal_relocs[n];
1106 break;
1107 }
1108 }
1109 if (comb_count > 1)
1110 qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela);
1111 }
1112
1113 /* Enumerate each EOP region that overlaps this section. */
1114 end_section = isec->vma + isec->_cooked_size;
1115 dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1;
1116 dot -= link_info->mpc860c0;
1117 section_modified = false;
1118 if (dot < isec->vma) /* Increment the start position if this section */
1119 dot = isec->vma; /* begins in the middle of its first EOP region. */
1120 for (;
1121 dot < end_section;
1122 dot += PAGESIZE, end_page += PAGESIZE)
1123 {
1124
1125 /* Check each word in this EOP region. */
1126 for (; dot < end_page; dot += 4)
1127 {
1128 bfd_vma isec_offset;
1129 unsigned long insn;
1130 boolean skip, modified;
1131
1132 /* Don't process this word if there is a relocation for it and
1133 the relocation indicates the word is not a conditional branch. */
1134 skip = false;
1135 isec_offset = dot - isec->vma;
1136 for (; comb_curr<comb_count; ++comb_curr)
1137 {
1138 bfd_vma r_offset;
1139
1140 r_offset = rela_comb[comb_curr]->r_offset;
1141 if (r_offset >= isec_offset)
1142 {
1143 if (r_offset == isec_offset) skip = true;
1144 break;
1145 }
1146 }
1147 if (skip) continue;
1148
1149 /* Check the current word for a problematic conditional branch. */
1150 #define BO0(insn) ((insn) & 0x02000000)
1151 #define BO2(insn) ((insn) & 0x00800000)
1152 #define BO4(insn) ((insn) & 0x00200000)
1153 insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset);
1154 modified = false;
1155 if ((insn & 0xFc000000) == 0x40000000)
1156 {
1157 /* Instruction is BCx */
1158 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1159 {
1160 bfd_vma target;
1161 /* This branch is predicted as "normal".
1162 If this is a forward branch, it is problematic. */
1163
1164 target = insn & 0x0000Fffc; /*extract*/
1165 target = (target ^ 0x8000) - 0x8000; /*sign extend*/
1166 if ((insn & 0x00000002) == 0)
1167 target += dot; /*convert to abs*/
1168 if (target > dot)
1169 {
1170 insn |= 0x00200000; /* set the prediction bit */
1171 modified = true;
1172 }
1173 }
1174 }
1175 else if ((insn & 0xFc00Fffe) == 0x4c000420)
1176 {
1177 /* Instruction is BCCTRx */
1178 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1179 {
1180 /* This branch is predicted as not-taken.
1181 If this is a forward branch, it is problematic.
1182 Since we can't tell statically if it will branch forward,
1183 always set the prediction bit. */
1184 insn |= 0x00200000; /* set the prediction bit */
1185 modified = true;
1186 }
1187 }
1188 else if ((insn & 0xFc00Fffe) == 0x4c000020)
1189 {
1190 /* Instruction is BCLRx */
1191 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1192 {
1193 /* This branch is predicted as not-taken.
1194 If this is a forward branch, it is problematic.
1195 Since we can't tell statically if it will branch forward,
1196 always set the prediction bit. */
1197 insn |= 0x00200000; /* set the prediction bit */
1198 modified = true;
1199 }
1200 }
1201 #undef BO0
1202 #undef BO2
1203 #undef BO4
1204 if (modified)
1205 {
1206 bfd_put_32 (abfd, (bfd_vma) insn, contents + isec_offset);
1207 section_modified = true;
1208 }
1209 }
1210 }
1211 if (section_modified)
1212 {
1213 elf_section_data (isec)->this_hdr.contents = contents;
1214 free_contents = NULL;
1215 }
1216 }
1217
1218 if (rela_comb != NULL)
1219 {
1220 free (rela_comb);
1221 rela_comb = NULL;
1222 }
1223
1224 if (free_relocs != NULL)
1225 {
1226 free (free_relocs);
1227 free_relocs = NULL;
1228 }
1229
1230 if (free_contents != NULL)
1231 {
1232 if (! link_info->keep_memory)
1233 free (free_contents);
1234 else
1235 {
1236 /* Cache the section contents for elf_link_input_bfd. */
1237 elf_section_data (isec)->this_hdr.contents = contents;
1238 }
1239 free_contents = NULL;
1240 }
1241
1242 return true;
1243
1244 error_return:
1245 if (rela_comb != NULL)
1246 free (rela_comb);
1247 if (free_relocs != NULL)
1248 free (free_relocs);
1249 if (free_contents != NULL)
1250 free (free_contents);
1251 return false;
1252 }
1253 \f
1254 static reloc_howto_type *
1255 ppc_elf_reloc_type_lookup (abfd, code)
1256 bfd *abfd ATTRIBUTE_UNUSED;
1257 bfd_reloc_code_real_type code;
1258 {
1259 enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE;
1260
1261 if (!ppc_elf_howto_table[R_PPC_ADDR32])
1262 /* Initialize howto table if needed. */
1263 ppc_elf_howto_init ();
1264
1265 switch ((int) code)
1266 {
1267 default:
1268 return (reloc_howto_type *) NULL;
1269
1270 case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break;
1271 case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break;
1272 case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break;
1273 case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break;
1274 case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break;
1275 case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break;
1276 case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break;
1277 case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break;
1278 case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break;
1279 case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break;
1280 case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break;
1281 case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break;
1282 case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break;
1283 case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break;
1284 case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break;
1285 case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break;
1286 case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break;
1287 case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break;
1288 case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break;
1289 case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break;
1290 case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break;
1291 case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break;
1292 case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break;
1293 case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break;
1294 case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break;
1295 case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break;
1296 case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break;
1297 case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break;
1298 case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break;
1299 case BFD_RELOC_32_BASEREL: ppc_reloc = R_PPC_SECTOFF; break;
1300 case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break;
1301 case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break;
1302 case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break;
1303 case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break;
1304 case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break;
1305 case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break;
1306 case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break;
1307 case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break;
1308 case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break;
1309 case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break;
1310 case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break;
1311 case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break;
1312 case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break;
1313 case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break;
1314 case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break;
1315 case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break;
1316 case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break;
1317 case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break;
1318 case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break;
1319 case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break;
1320 case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break;
1321 case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break;
1322 case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; break;
1323 }
1324
1325 return ppc_elf_howto_table[(int) ppc_reloc];
1326 };
1327
1328 /* Set the howto pointer for a PowerPC ELF reloc. */
1329
1330 static void
1331 ppc_elf_info_to_howto (abfd, cache_ptr, dst)
1332 bfd *abfd ATTRIBUTE_UNUSED;
1333 arelent *cache_ptr;
1334 Elf32_Internal_Rela *dst;
1335 {
1336 if (!ppc_elf_howto_table[R_PPC_ADDR32])
1337 /* Initialize howto table if needed. */
1338 ppc_elf_howto_init ();
1339
1340 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max);
1341 cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
1342 }
1343
1344 /* Handle the R_PPC_ADDR16_HA reloc. */
1345
1346 static bfd_reloc_status_type
1347 ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section,
1348 output_bfd, error_message)
1349 bfd *abfd ATTRIBUTE_UNUSED;
1350 arelent *reloc_entry;
1351 asymbol *symbol;
1352 PTR data ATTRIBUTE_UNUSED;
1353 asection *input_section;
1354 bfd *output_bfd;
1355 char **error_message ATTRIBUTE_UNUSED;
1356 {
1357 bfd_vma relocation;
1358
1359 if (output_bfd != NULL)
1360 {
1361 reloc_entry->address += input_section->output_offset;
1362 return bfd_reloc_ok;
1363 }
1364
1365 if (reloc_entry->address > input_section->_cooked_size)
1366 return bfd_reloc_outofrange;
1367
1368 if (bfd_is_com_section (symbol->section))
1369 relocation = 0;
1370 else
1371 relocation = symbol->value;
1372
1373 relocation += symbol->section->output_section->vma;
1374 relocation += symbol->section->output_offset;
1375 relocation += reloc_entry->addend;
1376
1377 reloc_entry->addend += (relocation & 0x8000) << 1;
1378
1379 return bfd_reloc_continue;
1380 }
1381
1382 /* Function to set whether a module needs the -mrelocatable bit set. */
1383
1384 static boolean
1385 ppc_elf_set_private_flags (abfd, flags)
1386 bfd *abfd;
1387 flagword flags;
1388 {
1389 BFD_ASSERT (!elf_flags_init (abfd)
1390 || elf_elfheader (abfd)->e_flags == flags);
1391
1392 elf_elfheader (abfd)->e_flags = flags;
1393 elf_flags_init (abfd) = true;
1394 return true;
1395 }
1396
1397 /* Copy backend specific data from one object module to another */
1398 static boolean
1399 ppc_elf_copy_private_bfd_data (ibfd, obfd)
1400 bfd *ibfd;
1401 bfd *obfd;
1402 {
1403 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1404 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1405 return true;
1406
1407 BFD_ASSERT (!elf_flags_init (obfd)
1408 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
1409
1410 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
1411 elf_flags_init (obfd) = true;
1412 return true;
1413 }
1414
1415 /* Merge backend specific data from an object file to the output
1416 object file when linking */
1417 static boolean
1418 ppc_elf_merge_private_bfd_data (ibfd, obfd)
1419 bfd *ibfd;
1420 bfd *obfd;
1421 {
1422 flagword old_flags;
1423 flagword new_flags;
1424 boolean error;
1425
1426 /* Check if we have the same endianess */
1427 if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
1428 return false;
1429
1430 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1431 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1432 return true;
1433
1434 new_flags = elf_elfheader (ibfd)->e_flags;
1435 old_flags = elf_elfheader (obfd)->e_flags;
1436 if (!elf_flags_init (obfd)) /* First call, no flags set */
1437 {
1438 elf_flags_init (obfd) = true;
1439 elf_elfheader (obfd)->e_flags = new_flags;
1440 }
1441
1442 else if (new_flags == old_flags) /* Compatible flags are ok */
1443 ;
1444
1445 else /* Incompatible flags */
1446 {
1447 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked
1448 with either. */
1449 error = false;
1450 if ((new_flags & EF_PPC_RELOCATABLE) != 0
1451 && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0)
1452 {
1453 error = true;
1454 (*_bfd_error_handler)
1455 (_("%s: compiled with -mrelocatable and linked with modules compiled normally"),
1456 bfd_archive_filename (ibfd));
1457 }
1458 else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
1459 && (old_flags & EF_PPC_RELOCATABLE) != 0)
1460 {
1461 error = true;
1462 (*_bfd_error_handler)
1463 (_("%s: compiled normally and linked with modules compiled with -mrelocatable"),
1464 bfd_archive_filename (ibfd));
1465 }
1466
1467 /* The output is -mrelocatable-lib iff both the input files are. */
1468 if (! (new_flags & EF_PPC_RELOCATABLE_LIB))
1469 elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB;
1470
1471 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
1472 but each input file is either -mrelocatable or -mrelocatable-lib. */
1473 if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB)
1474 && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))
1475 && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)))
1476 elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE;
1477
1478 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */
1479 elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB);
1480
1481 new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1482 old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1483
1484 /* Warn about any other mismatches */
1485 if (new_flags != old_flags)
1486 {
1487 error = true;
1488 (*_bfd_error_handler)
1489 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
1490 bfd_archive_filename (ibfd), (long) new_flags, (long) old_flags);
1491 }
1492
1493 if (error)
1494 {
1495 bfd_set_error (bfd_error_bad_value);
1496 return false;
1497 }
1498 }
1499
1500 return true;
1501 }
1502 \f
1503 /* Handle a PowerPC specific section when reading an object file. This
1504 is called when elfcode.h finds a section with an unknown type. */
1505
1506 static boolean
1507 ppc_elf_section_from_shdr (abfd, hdr, name)
1508 bfd *abfd;
1509 Elf32_Internal_Shdr *hdr;
1510 char *name;
1511 {
1512 asection *newsect;
1513 flagword flags;
1514
1515 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
1516 return false;
1517
1518 newsect = hdr->bfd_section;
1519 flags = bfd_get_section_flags (abfd, newsect);
1520 if (hdr->sh_flags & SHF_EXCLUDE)
1521 flags |= SEC_EXCLUDE;
1522
1523 if (hdr->sh_type == SHT_ORDERED)
1524 flags |= SEC_SORT_ENTRIES;
1525
1526 bfd_set_section_flags (abfd, newsect, flags);
1527 return true;
1528 }
1529 \f
1530 /* Set up any other section flags and such that may be necessary. */
1531
1532 static boolean
1533 ppc_elf_fake_sections (abfd, shdr, asect)
1534 bfd *abfd ATTRIBUTE_UNUSED;
1535 Elf32_Internal_Shdr *shdr;
1536 asection *asect;
1537 {
1538 if ((asect->flags & SEC_EXCLUDE) != 0)
1539 shdr->sh_flags |= SHF_EXCLUDE;
1540
1541 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
1542 shdr->sh_type = SHT_ORDERED;
1543
1544 return true;
1545 }
1546 \f
1547 /* Create a special linker section */
1548 static elf_linker_section_t *
1549 ppc_elf_create_linker_section (abfd, info, which)
1550 bfd *abfd;
1551 struct bfd_link_info *info;
1552 enum elf_linker_section_enum which;
1553 {
1554 bfd *dynobj = elf_hash_table (info)->dynobj;
1555 elf_linker_section_t *lsect;
1556
1557 /* Record the first bfd section that needs the special section */
1558 if (!dynobj)
1559 dynobj = elf_hash_table (info)->dynobj = abfd;
1560
1561 /* If this is the first time, create the section */
1562 lsect = elf_linker_section (dynobj, which);
1563 if (!lsect)
1564 {
1565 elf_linker_section_t defaults;
1566 static elf_linker_section_t zero_section;
1567
1568 defaults = zero_section;
1569 defaults.which = which;
1570 defaults.hole_written_p = false;
1571 defaults.alignment = 2;
1572
1573 /* Both of these sections are (technically) created by the user
1574 putting data in them, so they shouldn't be marked
1575 SEC_LINKER_CREATED.
1576
1577 The linker creates them so it has somewhere to attach their
1578 respective symbols. In fact, if they were empty it would
1579 be OK to leave the symbol set to 0 (or any random number), because
1580 the appropriate register should never be used. */
1581 defaults.flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1582 | SEC_IN_MEMORY);
1583
1584 switch (which)
1585 {
1586 default:
1587 (*_bfd_error_handler) (_("%s: Unknown special linker type %d"),
1588 bfd_get_filename (abfd),
1589 (int) which);
1590
1591 bfd_set_error (bfd_error_bad_value);
1592 return (elf_linker_section_t *) 0;
1593
1594 case LINKER_SECTION_SDATA: /* .sdata/.sbss section */
1595 defaults.name = ".sdata";
1596 defaults.rel_name = ".rela.sdata";
1597 defaults.bss_name = ".sbss";
1598 defaults.sym_name = "_SDA_BASE_";
1599 defaults.sym_offset = 32768;
1600 break;
1601
1602 case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */
1603 defaults.name = ".sdata2";
1604 defaults.rel_name = ".rela.sdata2";
1605 defaults.bss_name = ".sbss2";
1606 defaults.sym_name = "_SDA2_BASE_";
1607 defaults.sym_offset = 32768;
1608 defaults.flags |= SEC_READONLY;
1609 break;
1610 }
1611
1612 lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults);
1613 }
1614
1615 return lsect;
1616 }
1617 \f
1618 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we
1619 need to bump up the number of section headers. */
1620
1621 static int
1622 ppc_elf_additional_program_headers (abfd)
1623 bfd *abfd;
1624 {
1625 asection *s;
1626 int ret;
1627
1628 ret = 0;
1629
1630 s = bfd_get_section_by_name (abfd, ".interp");
1631 if (s != NULL)
1632 ++ret;
1633
1634 s = bfd_get_section_by_name (abfd, ".sbss2");
1635 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1636 ++ret;
1637
1638 s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0");
1639 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1640 ++ret;
1641
1642 return ret;
1643 }
1644
1645 /* Modify the segment map if needed. */
1646
1647 static boolean
1648 ppc_elf_modify_segment_map (abfd)
1649 bfd *abfd ATTRIBUTE_UNUSED;
1650 {
1651 return true;
1652 }
1653 \f
1654 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
1655 to output sections (just like _bfd_elf_create_dynamic_sections has
1656 to create .dynbss and .rela.bss). */
1657
1658 static boolean
1659 ppc_elf_create_dynamic_sections (abfd, info)
1660 bfd *abfd;
1661 struct bfd_link_info *info;
1662 {
1663 register asection *s;
1664 flagword flags;
1665
1666 if (!_bfd_elf_create_dynamic_sections (abfd, info))
1667 return false;
1668
1669 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1670 | SEC_LINKER_CREATED);
1671
1672 s = bfd_make_section (abfd, ".dynsbss");
1673 if (s == NULL
1674 || ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
1675 return false;
1676
1677 if (! info->shared)
1678 {
1679 s = bfd_make_section (abfd, ".rela.sbss");
1680 if (s == NULL
1681 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1682 || ! bfd_set_section_alignment (abfd, s, 2))
1683 return false;
1684 }
1685 return true;
1686 }
1687
1688 /* Adjust a symbol defined by a dynamic object and referenced by a
1689 regular object. The current definition is in some section of the
1690 dynamic object, but we're not including those sections. We have to
1691 change the definition to something the rest of the link can
1692 understand. */
1693
1694 static boolean
1695 ppc_elf_adjust_dynamic_symbol (info, h)
1696 struct bfd_link_info *info;
1697 struct elf_link_hash_entry *h;
1698 {
1699 bfd *dynobj = elf_hash_table (info)->dynobj;
1700 asection *s;
1701 unsigned int power_of_two;
1702 bfd_vma plt_offset;
1703
1704 #ifdef DEBUG
1705 fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string);
1706 #endif
1707
1708 /* Make sure we know what is going on here. */
1709 BFD_ASSERT (dynobj != NULL
1710 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
1711 || h->weakdef != NULL
1712 || ((h->elf_link_hash_flags
1713 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1714 && (h->elf_link_hash_flags
1715 & ELF_LINK_HASH_REF_REGULAR) != 0
1716 && (h->elf_link_hash_flags
1717 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
1718
1719 /* If this is a function, put it in the procedure linkage table. We
1720 will fill in the contents of the procedure linkage table later,
1721 when we know the address of the .got section. */
1722 if (h->type == STT_FUNC
1723 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1724 {
1725 if (! elf_hash_table (info)->dynamic_sections_created
1726 || SYMBOL_CALLS_LOCAL (info, h)
1727 || (info->shared && h->plt.refcount <= 0))
1728 {
1729 /* A PLT entry is not required/allowed when:
1730
1731 1. We are not using ld.so; because then the PLT entry
1732 can't be set up, so we can't use one.
1733
1734 2. We know for certain that a call to this symbol
1735 will go to this object.
1736
1737 3. GC has rendered the entry unused.
1738 Note, however, that in an executable all references to the
1739 symbol go to the PLT, so we can't turn it off in that case.
1740 ??? The correct thing to do here is to reference count
1741 all uses of the symbol, not just those to the GOT or PLT. */
1742 h->plt.offset = (bfd_vma) -1;
1743 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1744 return true;
1745 }
1746
1747 /* Make sure this symbol is output as a dynamic symbol. */
1748 if (h->dynindx == -1)
1749 {
1750 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1751 return false;
1752 }
1753 BFD_ASSERT (h->dynindx != -1);
1754
1755 s = bfd_get_section_by_name (dynobj, ".plt");
1756 BFD_ASSERT (s != NULL);
1757
1758 /* If this is the first .plt entry, make room for the special
1759 first entry. */
1760 if (s->_raw_size == 0)
1761 s->_raw_size += PLT_INITIAL_ENTRY_SIZE;
1762
1763 /* The PowerPC PLT is actually composed of two parts, the first part
1764 is 2 words (for a load and a jump), and then there is a remaining
1765 word available at the end. */
1766 plt_offset = (PLT_INITIAL_ENTRY_SIZE
1767 + (PLT_SLOT_SIZE
1768 * ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE)
1769 / PLT_ENTRY_SIZE)));
1770
1771 /* If this symbol is not defined in a regular file, and we are
1772 not generating a shared library, then set the symbol to this
1773 location in the .plt. This is required to make function
1774 pointers compare as equal between the normal executable and
1775 the shared library. */
1776 if (! info->shared
1777 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1778 {
1779 h->root.u.def.section = s;
1780 h->root.u.def.value = plt_offset;
1781 }
1782
1783 h->plt.offset = plt_offset;
1784
1785 /* Make room for this entry. After the 8192nd entry, room
1786 for two entries is allocated. */
1787 if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
1788 >= PLT_NUM_SINGLE_ENTRIES)
1789 s->_raw_size += 2 * PLT_ENTRY_SIZE;
1790 else
1791 s->_raw_size += PLT_ENTRY_SIZE;
1792
1793 /* We also need to make an entry in the .rela.plt section. */
1794 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1795 BFD_ASSERT (s != NULL);
1796 s->_raw_size += sizeof (Elf32_External_Rela);
1797
1798 return true;
1799 }
1800 else
1801 h->plt.offset = (bfd_vma) -1;
1802
1803 /* If this is a weak symbol, and there is a real definition, the
1804 processor independent code will have arranged for us to see the
1805 real definition first, and we can just use the same value. */
1806 if (h->weakdef != NULL)
1807 {
1808 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1809 || h->weakdef->root.type == bfd_link_hash_defweak);
1810 h->root.u.def.section = h->weakdef->root.u.def.section;
1811 h->root.u.def.value = h->weakdef->root.u.def.value;
1812 return true;
1813 }
1814
1815 /* This is a reference to a symbol defined by a dynamic object which
1816 is not a function. */
1817
1818 /* If we are creating a shared library, we must presume that the
1819 only references to the symbol are via the global offset table.
1820 For such cases we need not do anything here; the relocations will
1821 be handled correctly by relocate_section. */
1822 if (info->shared)
1823 return true;
1824
1825 /* We must allocate the symbol in our .dynbss section, which will
1826 become part of the .bss section of the executable. There will be
1827 an entry for this symbol in the .dynsym section. The dynamic
1828 object will contain position independent code, so all references
1829 from the dynamic object to this symbol will go through the global
1830 offset table. The dynamic linker will use the .dynsym entry to
1831 determine the address it must put in the global offset table, so
1832 both the dynamic object and the regular object will refer to the
1833 same memory location for the variable.
1834
1835 Of course, if the symbol is sufficiently small, we must instead
1836 allocate it in .sbss. FIXME: It would be better to do this if and
1837 only if there were actually SDAREL relocs for that symbol. */
1838
1839 if (h->size <= elf_gp_size (dynobj))
1840 s = bfd_get_section_by_name (dynobj, ".dynsbss");
1841 else
1842 s = bfd_get_section_by_name (dynobj, ".dynbss");
1843 BFD_ASSERT (s != NULL);
1844
1845 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
1846 copy the initial value out of the dynamic object and into the
1847 runtime process image. We need to remember the offset into the
1848 .rela.bss section we are going to use. */
1849 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1850 {
1851 asection *srel;
1852
1853 if (h->size <= elf_gp_size (dynobj))
1854 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
1855 else
1856 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1857 BFD_ASSERT (srel != NULL);
1858 srel->_raw_size += sizeof (Elf32_External_Rela);
1859 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1860 }
1861
1862 /* We need to figure out the alignment required for this symbol. I
1863 have no idea how ELF linkers handle this. */
1864 power_of_two = bfd_log2 (h->size);
1865 if (power_of_two > 4)
1866 power_of_two = 4;
1867
1868 /* Apply the required alignment. */
1869 s->_raw_size = BFD_ALIGN (s->_raw_size,
1870 (bfd_size_type) (1 << power_of_two));
1871 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1872 {
1873 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1874 return false;
1875 }
1876
1877 /* Define the symbol as being at this point in the section. */
1878 h->root.u.def.section = s;
1879 h->root.u.def.value = s->_raw_size;
1880
1881 /* Increment the section size to make room for the symbol. */
1882 s->_raw_size += h->size;
1883
1884 return true;
1885 }
1886 \f
1887 /* Set the sizes of the dynamic sections. */
1888
1889 static boolean
1890 ppc_elf_size_dynamic_sections (output_bfd, info)
1891 bfd *output_bfd ATTRIBUTE_UNUSED;
1892 struct bfd_link_info *info;
1893 {
1894 bfd *dynobj;
1895 asection *s;
1896 boolean plt;
1897 boolean relocs;
1898
1899 #ifdef DEBUG
1900 fprintf (stderr, "ppc_elf_size_dynamic_sections called\n");
1901 #endif
1902
1903 dynobj = elf_hash_table (info)->dynobj;
1904 BFD_ASSERT (dynobj != NULL);
1905
1906 if (elf_hash_table (info)->dynamic_sections_created)
1907 {
1908 /* Set the contents of the .interp section to the interpreter. */
1909 if (! info->shared)
1910 {
1911 s = bfd_get_section_by_name (dynobj, ".interp");
1912 BFD_ASSERT (s != NULL);
1913 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1914 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1915 }
1916 }
1917 else
1918 {
1919 /* We may have created entries in the .rela.got, .rela.sdata, and
1920 .rela.sdata2 sections. However, if we are not creating the
1921 dynamic sections, we will not actually use these entries. Reset
1922 the size of .rela.got, et al, which will cause it to get
1923 stripped from the output file below. */
1924 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
1925 ".rela.sdata2", ".rela.sbss",
1926 (char *) 0 };
1927 char **p;
1928
1929 for (p = rela_sections; *p != (char *) 0; p++)
1930 {
1931 s = bfd_get_section_by_name (dynobj, *p);
1932 if (s != NULL)
1933 s->_raw_size = 0;
1934 }
1935 }
1936
1937 /* The check_relocs and adjust_dynamic_symbol entry points have
1938 determined the sizes of the various dynamic sections. Allocate
1939 memory for them. */
1940 plt = false;
1941 relocs = false;
1942 for (s = dynobj->sections; s != NULL; s = s->next)
1943 {
1944 const char *name;
1945 boolean strip;
1946
1947 if ((s->flags & SEC_LINKER_CREATED) == 0)
1948 continue;
1949
1950 /* It's OK to base decisions on the section name, because none
1951 of the dynobj section names depend upon the input files. */
1952 name = bfd_get_section_name (dynobj, s);
1953
1954 strip = false;
1955
1956 if (strcmp (name, ".plt") == 0)
1957 {
1958 if (s->_raw_size == 0)
1959 {
1960 /* Strip this section if we don't need it; see the
1961 comment below. */
1962 strip = true;
1963 }
1964 else
1965 {
1966 /* Remember whether there is a PLT. */
1967 plt = true;
1968 }
1969 }
1970 else if (strncmp (name, ".rela", 5) == 0)
1971 {
1972 if (s->_raw_size == 0)
1973 {
1974 /* If we don't need this section, strip it from the
1975 output file. This is mostly to handle .rela.bss and
1976 .rela.plt. We must create both sections in
1977 create_dynamic_sections, because they must be created
1978 before the linker maps input sections to output
1979 sections. The linker does that before
1980 adjust_dynamic_symbol is called, and it is that
1981 function which decides whether anything needs to go
1982 into these sections. */
1983 strip = true;
1984 }
1985 else
1986 {
1987 /* Remember whether there are any relocation sections. */
1988 relocs = true;
1989
1990 /* We use the reloc_count field as a counter if we need
1991 to copy relocs into the output file. */
1992 s->reloc_count = 0;
1993 }
1994 }
1995 else if (strcmp (name, ".got") != 0
1996 && strcmp (name, ".sdata") != 0
1997 && strcmp (name, ".sdata2") != 0)
1998 {
1999 /* It's not one of our sections, so don't allocate space. */
2000 continue;
2001 }
2002
2003 if (strip)
2004 {
2005 _bfd_strip_section_from_output (info, s);
2006 continue;
2007 }
2008
2009 /* Allocate memory for the section contents. */
2010 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2011 if (s->contents == NULL && s->_raw_size != 0)
2012 return false;
2013 }
2014
2015 if (elf_hash_table (info)->dynamic_sections_created)
2016 {
2017 /* Add some entries to the .dynamic section. We fill in the
2018 values later, in ppc_elf_finish_dynamic_sections, but we
2019 must add the entries now so that we get the correct size for
2020 the .dynamic section. The DT_DEBUG entry is filled in by the
2021 dynamic linker and used by the debugger. */
2022 #define add_dynamic_entry(TAG, VAL) \
2023 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2024
2025 if (!info->shared)
2026 {
2027 if (!add_dynamic_entry (DT_DEBUG, 0))
2028 return false;
2029 }
2030
2031 if (plt)
2032 {
2033 if (!add_dynamic_entry (DT_PLTGOT, 0)
2034 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2035 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2036 || !add_dynamic_entry (DT_JMPREL, 0))
2037 return false;
2038 }
2039
2040 if (relocs)
2041 {
2042 if (!add_dynamic_entry (DT_RELA, 0)
2043 || !add_dynamic_entry (DT_RELASZ, 0)
2044 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2045 return false;
2046 }
2047
2048 if ((info->flags & DF_TEXTREL) != 0)
2049 {
2050 if (!add_dynamic_entry (DT_TEXTREL, 0))
2051 return false;
2052 info->flags |= DF_TEXTREL;
2053 }
2054 }
2055 #undef add_dynamic_entry
2056
2057 return true;
2058 }
2059 \f
2060 /* Look through the relocs for a section during the first phase, and
2061 allocate space in the global offset table or procedure linkage
2062 table. */
2063
2064 static boolean
2065 ppc_elf_check_relocs (abfd, info, sec, relocs)
2066 bfd *abfd;
2067 struct bfd_link_info *info;
2068 asection *sec;
2069 const Elf_Internal_Rela *relocs;
2070 {
2071 bfd *dynobj;
2072 Elf_Internal_Shdr *symtab_hdr;
2073 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2074 const Elf_Internal_Rela *rel;
2075 const Elf_Internal_Rela *rel_end;
2076 bfd_signed_vma *local_got_refcounts;
2077 elf_linker_section_t *sdata;
2078 elf_linker_section_t *sdata2;
2079 asection *sreloc;
2080 asection *sgot = NULL;
2081 asection *srelgot = NULL;
2082
2083 if (info->relocateable)
2084 return true;
2085
2086 #ifdef DEBUG
2087 fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n",
2088 bfd_get_section_name (abfd, sec),
2089 bfd_archive_filename (abfd));
2090 #endif
2091
2092 /* Create the linker generated sections all the time so that the
2093 special symbols are created. */
2094
2095 if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL)
2096 {
2097 sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2098 if (!sdata)
2099 return false;
2100 }
2101
2102 if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL)
2103 {
2104 sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2);
2105 if (!sdata2)
2106 return false;
2107 }
2108
2109 dynobj = elf_hash_table (info)->dynobj;
2110 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2111 local_got_refcounts = elf_local_got_refcounts (abfd);
2112
2113 sym_hashes = elf_sym_hashes (abfd);
2114 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
2115 if (!elf_bad_symtab (abfd))
2116 sym_hashes_end -= symtab_hdr->sh_info;
2117
2118 sreloc = NULL;
2119
2120 rel_end = relocs + sec->reloc_count;
2121 for (rel = relocs; rel < rel_end; rel++)
2122 {
2123 unsigned long r_symndx;
2124 struct elf_link_hash_entry *h;
2125
2126 r_symndx = ELF32_R_SYM (rel->r_info);
2127 if (r_symndx < symtab_hdr->sh_info)
2128 h = NULL;
2129 else
2130 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2131
2132 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
2133 This shows up in particular in an R_PPC_ADDR32 in the eabi
2134 startup code. */
2135 if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2136 {
2137 if (sgot == NULL)
2138 {
2139 if (dynobj == NULL)
2140 elf_hash_table (info)->dynobj = dynobj = abfd;
2141 if (! _bfd_elf_create_got_section (dynobj, info))
2142 return false;
2143 sgot = bfd_get_section_by_name (dynobj, ".got");
2144 BFD_ASSERT (sgot != NULL);
2145 }
2146 }
2147
2148 switch (ELF32_R_TYPE (rel->r_info))
2149 {
2150 /* GOT16 relocations */
2151 case R_PPC_GOT16:
2152 case R_PPC_GOT16_LO:
2153 case R_PPC_GOT16_HI:
2154 case R_PPC_GOT16_HA:
2155 /* This symbol requires a global offset table entry. */
2156
2157 if (sgot == NULL)
2158 {
2159 if (dynobj == NULL)
2160 elf_hash_table (info)->dynobj = dynobj = abfd;
2161 if (! _bfd_elf_create_got_section (dynobj, info))
2162 return false;
2163 sgot = bfd_get_section_by_name (dynobj, ".got");
2164 BFD_ASSERT (sgot != NULL);
2165 }
2166
2167 if (srelgot == NULL
2168 && (h != NULL || info->shared))
2169 {
2170 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2171 if (srelgot == NULL)
2172 {
2173 srelgot = bfd_make_section (dynobj, ".rela.got");
2174 if (srelgot == NULL
2175 || ! bfd_set_section_flags (dynobj, srelgot,
2176 (SEC_ALLOC
2177 | SEC_LOAD
2178 | SEC_HAS_CONTENTS
2179 | SEC_IN_MEMORY
2180 | SEC_LINKER_CREATED
2181 | SEC_READONLY))
2182 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2183 return false;
2184 }
2185 }
2186
2187 if (h != NULL)
2188 {
2189 if (h->got.refcount == 0)
2190 {
2191 /* Make sure this symbol is output as a dynamic symbol. */
2192 if (h->dynindx == -1)
2193 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2194 return false;
2195
2196 /* Allocate space in the .got. */
2197 sgot->_raw_size += 4;
2198 /* Allocate relocation space. */
2199 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2200 }
2201 h->got.refcount++;
2202 }
2203 else
2204 {
2205 /* This is a global offset table entry for a local symbol. */
2206 if (local_got_refcounts == NULL)
2207 {
2208 bfd_size_type size;
2209
2210 size = symtab_hdr->sh_info;
2211 size *= sizeof (bfd_signed_vma);
2212 local_got_refcounts
2213 = (bfd_signed_vma *) bfd_zalloc (abfd, size);
2214 if (local_got_refcounts == NULL)
2215 return false;
2216 elf_local_got_refcounts (abfd) = local_got_refcounts;
2217 }
2218 if (local_got_refcounts[r_symndx] == 0)
2219 {
2220 sgot->_raw_size += 4;
2221
2222 /* If we are generating a shared object, we need to
2223 output a R_PPC_RELATIVE reloc so that the
2224 dynamic linker can adjust this GOT entry. */
2225 if (info->shared)
2226 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2227 }
2228 local_got_refcounts[r_symndx]++;
2229 }
2230 break;
2231
2232 /* Indirect .sdata relocation */
2233 case R_PPC_EMB_SDAI16:
2234 if (info->shared)
2235 {
2236 ((*_bfd_error_handler)
2237 (_("%s: relocation %s cannot be used when making a shared object"),
2238 bfd_archive_filename (abfd), "R_PPC_EMB_SDAI16"));
2239 return false;
2240 }
2241
2242 if (srelgot == NULL && (h != NULL || info->shared))
2243 {
2244 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2245 if (srelgot == NULL)
2246 {
2247 srelgot = bfd_make_section (dynobj, ".rela.got");
2248 if (srelgot == NULL
2249 || ! bfd_set_section_flags (dynobj, srelgot,
2250 (SEC_ALLOC
2251 | SEC_LOAD
2252 | SEC_HAS_CONTENTS
2253 | SEC_IN_MEMORY
2254 | SEC_LINKER_CREATED
2255 | SEC_READONLY))
2256 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2257 return false;
2258 }
2259 }
2260
2261 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel))
2262 return false;
2263
2264 break;
2265
2266 /* Indirect .sdata2 relocation */
2267 case R_PPC_EMB_SDA2I16:
2268 if (info->shared)
2269 {
2270 ((*_bfd_error_handler)
2271 (_("%s: relocation %s cannot be used when making a shared object"),
2272 bfd_archive_filename (abfd), "R_PPC_EMB_SDA2I16"));
2273 return false;
2274 }
2275
2276 if (srelgot == NULL && (h != NULL || info->shared))
2277 {
2278 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2279 if (srelgot == NULL)
2280 {
2281 srelgot = bfd_make_section (dynobj, ".rela.got");
2282 if (srelgot == NULL
2283 || ! bfd_set_section_flags (dynobj, srelgot,
2284 (SEC_ALLOC
2285 | SEC_LOAD
2286 | SEC_HAS_CONTENTS
2287 | SEC_IN_MEMORY
2288 | SEC_LINKER_CREATED
2289 | SEC_READONLY))
2290 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2291 return false;
2292 }
2293 }
2294
2295 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel))
2296 return false;
2297
2298 break;
2299
2300 case R_PPC_SDAREL16:
2301 case R_PPC_EMB_SDA2REL:
2302 case R_PPC_EMB_SDA21:
2303 if (info->shared)
2304 {
2305 ((*_bfd_error_handler)
2306 (_("%s: relocation %s cannot be used when making a shared object"),
2307 bfd_archive_filename (abfd),
2308 ppc_elf_howto_table[(int) ELF32_R_TYPE (rel->r_info)]->name));
2309 return false;
2310 }
2311 break;
2312
2313 case R_PPC_PLT32:
2314 case R_PPC_PLTREL24:
2315 case R_PPC_PLT16_LO:
2316 case R_PPC_PLT16_HI:
2317 case R_PPC_PLT16_HA:
2318 #ifdef DEBUG
2319 fprintf (stderr, "Reloc requires a PLT entry\n");
2320 #endif
2321 /* This symbol requires a procedure linkage table entry. We
2322 actually build the entry in adjust_dynamic_symbol,
2323 because this might be a case of linking PIC code without
2324 linking in any dynamic objects, in which case we don't
2325 need to generate a procedure linkage table after all. */
2326
2327 if (h == NULL)
2328 {
2329 /* It does not make sense to have a procedure linkage
2330 table entry for a local symbol. */
2331 bfd_set_error (bfd_error_bad_value);
2332 return false;
2333 }
2334
2335 /* Make sure this symbol is output as a dynamic symbol. */
2336 if (h->dynindx == -1)
2337 {
2338 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2339 return false;
2340 }
2341 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2342 h->plt.refcount++;
2343 break;
2344
2345 /* The following relocations don't need to propagate the
2346 relocation if linking a shared object since they are
2347 section relative. */
2348 case R_PPC_SECTOFF:
2349 case R_PPC_SECTOFF_LO:
2350 case R_PPC_SECTOFF_HI:
2351 case R_PPC_SECTOFF_HA:
2352 break;
2353
2354 /* This refers only to functions defined in the shared library */
2355 case R_PPC_LOCAL24PC:
2356 break;
2357
2358 /* This relocation describes the C++ object vtable hierarchy.
2359 Reconstruct it for later use during GC. */
2360 case R_PPC_GNU_VTINHERIT:
2361 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2362 return false;
2363 break;
2364
2365 /* This relocation describes which C++ vtable entries are actually
2366 used. Record for later use during GC. */
2367 case R_PPC_GNU_VTENTRY:
2368 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2369 return false;
2370 break;
2371
2372 /* When creating a shared object, we must copy these
2373 relocs into the output file. We create a reloc
2374 section in dynobj and make room for the reloc. */
2375 case R_PPC_REL24:
2376 case R_PPC_REL14:
2377 case R_PPC_REL14_BRTAKEN:
2378 case R_PPC_REL14_BRNTAKEN:
2379 case R_PPC_REL32:
2380 if (h == NULL
2381 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2382 || SYMBOL_REFERENCES_LOCAL (info, h))
2383 break;
2384 /* fall through */
2385
2386 default:
2387 if (info->shared)
2388 {
2389 #ifdef DEBUG
2390 fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n",
2391 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
2392 #endif
2393 if (sreloc == NULL)
2394 {
2395 const char *name;
2396
2397 name = (bfd_elf_string_from_elf_section
2398 (abfd,
2399 elf_elfheader (abfd)->e_shstrndx,
2400 elf_section_data (sec)->rel_hdr.sh_name));
2401 if (name == NULL)
2402 return false;
2403
2404 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2405 && strcmp (bfd_get_section_name (abfd, sec),
2406 name + 5) == 0);
2407
2408 sreloc = bfd_get_section_by_name (dynobj, name);
2409 if (sreloc == NULL)
2410 {
2411 flagword flags;
2412
2413 sreloc = bfd_make_section (dynobj, name);
2414 flags = (SEC_HAS_CONTENTS | SEC_READONLY
2415 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2416 if ((sec->flags & SEC_ALLOC) != 0)
2417 flags |= SEC_ALLOC | SEC_LOAD;
2418 if (sreloc == NULL
2419 || ! bfd_set_section_flags (dynobj, sreloc, flags)
2420 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
2421 return false;
2422 }
2423 if (sec->flags & SEC_READONLY)
2424 info->flags |= DF_TEXTREL;
2425 }
2426
2427 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2428
2429 /* FIXME: We should here do what the m68k and i386
2430 backends do: if the reloc is pc-relative, record it
2431 in case it turns out that the reloc is unnecessary
2432 because the symbol is forced local by versioning or
2433 we are linking with -Bdynamic. Fortunately this
2434 case is not frequent. */
2435 }
2436
2437 break;
2438 }
2439 }
2440
2441 return true;
2442 }
2443
2444 /* Return the section that should be marked against GC for a given
2445 relocation. */
2446
2447 static asection *
2448 ppc_elf_gc_mark_hook (abfd, info, rel, h, sym)
2449 bfd *abfd;
2450 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2451 Elf_Internal_Rela *rel;
2452 struct elf_link_hash_entry *h;
2453 Elf_Internal_Sym *sym;
2454 {
2455 if (h != NULL)
2456 {
2457 switch (ELF32_R_TYPE (rel->r_info))
2458 {
2459 case R_PPC_GNU_VTINHERIT:
2460 case R_PPC_GNU_VTENTRY:
2461 break;
2462
2463 default:
2464 switch (h->root.type)
2465 {
2466 case bfd_link_hash_defined:
2467 case bfd_link_hash_defweak:
2468 return h->root.u.def.section;
2469
2470 case bfd_link_hash_common:
2471 return h->root.u.c.p->section;
2472
2473 default:
2474 break;
2475 }
2476 }
2477 }
2478 else
2479 {
2480 return bfd_section_from_elf_index (abfd, sym->st_shndx);
2481 }
2482
2483 return NULL;
2484 }
2485
2486 /* Update the got entry reference counts for the section being removed. */
2487
2488 static boolean
2489 ppc_elf_gc_sweep_hook (abfd, info, sec, relocs)
2490 bfd *abfd;
2491 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2492 asection *sec;
2493 const Elf_Internal_Rela *relocs;
2494 {
2495 Elf_Internal_Shdr *symtab_hdr;
2496 struct elf_link_hash_entry **sym_hashes;
2497 bfd_signed_vma *local_got_refcounts;
2498 const Elf_Internal_Rela *rel, *relend;
2499 unsigned long r_symndx;
2500 struct elf_link_hash_entry *h;
2501
2502 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2503 sym_hashes = elf_sym_hashes (abfd);
2504 local_got_refcounts = elf_local_got_refcounts (abfd);
2505
2506 relend = relocs + sec->reloc_count;
2507 for (rel = relocs; rel < relend; rel++)
2508 switch (ELF32_R_TYPE (rel->r_info))
2509 {
2510 case R_PPC_GOT16:
2511 case R_PPC_GOT16_LO:
2512 case R_PPC_GOT16_HI:
2513 case R_PPC_GOT16_HA:
2514 r_symndx = ELF32_R_SYM (rel->r_info);
2515 if (r_symndx >= symtab_hdr->sh_info)
2516 {
2517 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2518 if (h->got.refcount > 0)
2519 h->got.refcount--;
2520 }
2521 else if (local_got_refcounts != NULL)
2522 {
2523 if (local_got_refcounts[r_symndx] > 0)
2524 local_got_refcounts[r_symndx]--;
2525 }
2526 break;
2527
2528 case R_PPC_PLT32:
2529 case R_PPC_PLTREL24:
2530 case R_PPC_PLT16_LO:
2531 case R_PPC_PLT16_HI:
2532 case R_PPC_PLT16_HA:
2533 r_symndx = ELF32_R_SYM (rel->r_info);
2534 if (r_symndx >= symtab_hdr->sh_info)
2535 {
2536 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2537 if (h->plt.refcount > 0)
2538 h->plt.refcount--;
2539 }
2540 break;
2541
2542 default:
2543 break;
2544 }
2545
2546 return true;
2547 }
2548 \f
2549 /* Hook called by the linker routine which adds symbols from an object
2550 file. We use it to put .comm items in .sbss, and not .bss. */
2551
2552 static boolean
2553 ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
2554 bfd *abfd;
2555 struct bfd_link_info *info;
2556 const Elf_Internal_Sym *sym;
2557 const char **namep ATTRIBUTE_UNUSED;
2558 flagword *flagsp ATTRIBUTE_UNUSED;
2559 asection **secp;
2560 bfd_vma *valp;
2561 {
2562 if (sym->st_shndx == SHN_COMMON
2563 && !info->relocateable
2564 && sym->st_size <= elf_gp_size (abfd))
2565 {
2566 /* Common symbols less than or equal to -G nn bytes are automatically
2567 put into .sdata. */
2568 elf_linker_section_t *sdata
2569 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2570
2571 if (!sdata->bss_section)
2572 {
2573 bfd_size_type amt;
2574
2575 /* We don't go through bfd_make_section, because we don't
2576 want to attach this common section to DYNOBJ. The linker
2577 will move the symbols to the appropriate output section
2578 when it defines common symbols. */
2579 amt = sizeof (asection);
2580 sdata->bss_section = (asection *) bfd_zalloc (abfd, amt);
2581 if (sdata->bss_section == NULL)
2582 return false;
2583 sdata->bss_section->name = sdata->bss_name;
2584 sdata->bss_section->flags = SEC_IS_COMMON;
2585 sdata->bss_section->output_section = sdata->bss_section;
2586 amt = sizeof (asymbol);
2587 sdata->bss_section->symbol = (asymbol *) bfd_zalloc (abfd, amt);
2588 amt = sizeof (asymbol *);
2589 sdata->bss_section->symbol_ptr_ptr =
2590 (asymbol **) bfd_zalloc (abfd, amt);
2591 if (sdata->bss_section->symbol == NULL
2592 || sdata->bss_section->symbol_ptr_ptr == NULL)
2593 return false;
2594 sdata->bss_section->symbol->name = sdata->bss_name;
2595 sdata->bss_section->symbol->flags = BSF_SECTION_SYM;
2596 sdata->bss_section->symbol->section = sdata->bss_section;
2597 *sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol;
2598 }
2599
2600 *secp = sdata->bss_section;
2601 *valp = sym->st_size;
2602 }
2603
2604 return true;
2605 }
2606 \f
2607 /* Finish up dynamic symbol handling. We set the contents of various
2608 dynamic sections here. */
2609
2610 static boolean
2611 ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym)
2612 bfd *output_bfd;
2613 struct bfd_link_info *info;
2614 struct elf_link_hash_entry *h;
2615 Elf_Internal_Sym *sym;
2616 {
2617 bfd *dynobj;
2618
2619 #ifdef DEBUG
2620 fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s",
2621 h->root.root.string);
2622 #endif
2623
2624 dynobj = elf_hash_table (info)->dynobj;
2625 BFD_ASSERT (dynobj != NULL);
2626
2627 if (h->plt.offset != (bfd_vma) -1)
2628 {
2629 asection *splt;
2630 asection *srela;
2631 Elf_Internal_Rela rela;
2632 bfd_vma reloc_index;
2633
2634 #ifdef DEBUG
2635 fprintf (stderr, ", plt_offset = %d", h->plt.offset);
2636 #endif
2637
2638 /* This symbol has an entry in the procedure linkage table. Set
2639 it up. */
2640
2641 BFD_ASSERT (h->dynindx != -1);
2642
2643 splt = bfd_get_section_by_name (dynobj, ".plt");
2644 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
2645 BFD_ASSERT (splt != NULL && srela != NULL);
2646
2647 /* We don't need to fill in the .plt. The ppc dynamic linker
2648 will fill it in. */
2649
2650 /* Fill in the entry in the .rela.plt section. */
2651 rela.r_offset = (splt->output_section->vma
2652 + splt->output_offset
2653 + h->plt.offset);
2654 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT);
2655 rela.r_addend = 0;
2656
2657 reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE;
2658 if (reloc_index > PLT_NUM_SINGLE_ENTRIES)
2659 reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2;
2660 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2661 ((Elf32_External_Rela *) srela->contents
2662 + reloc_index));
2663
2664 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2665 {
2666 /* Mark the symbol as undefined, rather than as defined in
2667 the .plt section. Leave the value alone. */
2668 sym->st_shndx = SHN_UNDEF;
2669 /* If the symbol is weak, we do need to clear the value.
2670 Otherwise, the PLT entry would provide a definition for
2671 the symbol even if the symbol wasn't defined anywhere,
2672 and so the symbol would never be NULL. */
2673 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
2674 == 0)
2675 sym->st_value = 0;
2676 }
2677 }
2678
2679 if (h->got.offset != (bfd_vma) -1)
2680 {
2681 asection *sgot;
2682 asection *srela;
2683 Elf_Internal_Rela rela;
2684
2685 /* This symbol has an entry in the global offset table. Set it
2686 up. */
2687
2688 sgot = bfd_get_section_by_name (dynobj, ".got");
2689 srela = bfd_get_section_by_name (dynobj, ".rela.got");
2690 BFD_ASSERT (sgot != NULL && srela != NULL);
2691
2692 rela.r_offset = (sgot->output_section->vma
2693 + sgot->output_offset
2694 + (h->got.offset &~ (bfd_vma) 1));
2695
2696 /* If this is a -Bsymbolic link, and the symbol is defined
2697 locally, we just want to emit a RELATIVE reloc. The entry in
2698 the global offset table will already have been initialized in
2699 the relocate_section function. */
2700 if (info->shared
2701 && SYMBOL_REFERENCES_LOCAL (info, h))
2702 {
2703 rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
2704 rela.r_addend = (h->root.u.def.value
2705 + h->root.u.def.section->output_section->vma
2706 + h->root.u.def.section->output_offset);
2707 }
2708 else
2709 {
2710 BFD_ASSERT ((h->got.offset & 1) == 0);
2711 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
2712 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT);
2713 rela.r_addend = 0;
2714 }
2715
2716 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2717 ((Elf32_External_Rela *) srela->contents
2718 + srela->reloc_count));
2719 ++srela->reloc_count;
2720 }
2721
2722 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2723 {
2724 asection *s;
2725 Elf_Internal_Rela rela;
2726
2727 /* This symbols needs a copy reloc. Set it up. */
2728
2729 #ifdef DEBUG
2730 fprintf (stderr, ", copy");
2731 #endif
2732
2733 BFD_ASSERT (h->dynindx != -1);
2734
2735 if (h->size <= elf_gp_size (dynobj))
2736 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2737 ".rela.sbss");
2738 else
2739 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2740 ".rela.bss");
2741 BFD_ASSERT (s != NULL);
2742
2743 rela.r_offset = (h->root.u.def.value
2744 + h->root.u.def.section->output_section->vma
2745 + h->root.u.def.section->output_offset);
2746 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY);
2747 rela.r_addend = 0;
2748 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2749 ((Elf32_External_Rela *) s->contents
2750 + s->reloc_count));
2751 ++s->reloc_count;
2752 }
2753
2754 #ifdef DEBUG
2755 fprintf (stderr, "\n");
2756 #endif
2757
2758 /* Mark some specially defined symbols as absolute. */
2759 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2760 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2761 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2762 sym->st_shndx = SHN_ABS;
2763
2764 return true;
2765 }
2766 \f
2767 /* Finish up the dynamic sections. */
2768
2769 static boolean
2770 ppc_elf_finish_dynamic_sections (output_bfd, info)
2771 bfd *output_bfd;
2772 struct bfd_link_info *info;
2773 {
2774 asection *sdyn;
2775 bfd *dynobj = elf_hash_table (info)->dynobj;
2776 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
2777
2778 #ifdef DEBUG
2779 fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n");
2780 #endif
2781
2782 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2783
2784 if (elf_hash_table (info)->dynamic_sections_created)
2785 {
2786 asection *splt;
2787 Elf32_External_Dyn *dyncon, *dynconend;
2788
2789 splt = bfd_get_section_by_name (dynobj, ".plt");
2790 BFD_ASSERT (splt != NULL && sdyn != NULL);
2791
2792 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2793 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2794 for (; dyncon < dynconend; dyncon++)
2795 {
2796 Elf_Internal_Dyn dyn;
2797 const char *name;
2798 boolean size;
2799
2800 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2801
2802 switch (dyn.d_tag)
2803 {
2804 case DT_PLTGOT: name = ".plt"; size = false; break;
2805 case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
2806 case DT_JMPREL: name = ".rela.plt"; size = false; break;
2807 default: name = NULL; size = false; break;
2808 }
2809
2810 if (name != NULL)
2811 {
2812 asection *s;
2813
2814 s = bfd_get_section_by_name (output_bfd, name);
2815 if (s == NULL)
2816 dyn.d_un.d_val = 0;
2817 else
2818 {
2819 if (! size)
2820 dyn.d_un.d_ptr = s->vma;
2821 else
2822 {
2823 if (s->_cooked_size != 0)
2824 dyn.d_un.d_val = s->_cooked_size;
2825 else
2826 dyn.d_un.d_val = s->_raw_size;
2827 }
2828 }
2829 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2830 }
2831 }
2832 }
2833
2834 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
2835 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
2836 if (sgot)
2837 {
2838 unsigned char *contents = sgot->contents;
2839 bfd_put_32 (output_bfd, (bfd_vma) 0x4e800021 /* blrl */, contents);
2840
2841 if (sdyn == NULL)
2842 bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
2843 else
2844 bfd_put_32 (output_bfd,
2845 sdyn->output_section->vma + sdyn->output_offset,
2846 contents+4);
2847
2848 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2849 }
2850
2851 return true;
2852 }
2853 \f
2854 /* The RELOCATE_SECTION function is called by the ELF backend linker
2855 to handle the relocations for a section.
2856
2857 The relocs are always passed as Rela structures; if the section
2858 actually uses Rel structures, the r_addend field will always be
2859 zero.
2860
2861 This function is responsible for adjust the section contents as
2862 necessary, and (if using Rela relocs and generating a
2863 relocateable output file) adjusting the reloc addend as
2864 necessary.
2865
2866 This function does not have to worry about setting the reloc
2867 address or the reloc symbol index.
2868
2869 LOCAL_SYMS is a pointer to the swapped in local symbols.
2870
2871 LOCAL_SECTIONS is an array giving the section in the input file
2872 corresponding to the st_shndx field of each local symbol.
2873
2874 The global hash table entry for the global symbols can be found
2875 via elf_sym_hashes (input_bfd).
2876
2877 When generating relocateable output, this function must handle
2878 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
2879 going to be the section symbol corresponding to the output
2880 section, which means that the addend must be adjusted
2881 accordingly. */
2882
2883 static boolean
2884 ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
2885 contents, relocs, local_syms, local_sections)
2886 bfd *output_bfd;
2887 struct bfd_link_info *info;
2888 bfd *input_bfd;
2889 asection *input_section;
2890 bfd_byte *contents;
2891 Elf_Internal_Rela *relocs;
2892 Elf_Internal_Sym *local_syms;
2893 asection **local_sections;
2894 {
2895 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2896 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
2897 bfd *dynobj = elf_hash_table (info)->dynobj;
2898 elf_linker_section_t *sdata = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA) : NULL;
2899 elf_linker_section_t *sdata2 = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA2) : NULL;
2900 Elf_Internal_Rela *rel = relocs;
2901 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
2902 asection *sreloc = NULL;
2903 asection *splt;
2904 asection *sgot;
2905 bfd_vma *local_got_offsets;
2906 boolean ret = true;
2907 long insn;
2908
2909 #ifdef DEBUG
2910 fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n",
2911 bfd_archive_filename (input_bfd),
2912 bfd_section_name(input_bfd, input_section),
2913 (long) input_section->reloc_count,
2914 (info->relocateable) ? " (relocatable)" : "");
2915 #endif
2916
2917 if (!ppc_elf_howto_table[R_PPC_ADDR32])
2918 /* Initialize howto table if needed. */
2919 ppc_elf_howto_init ();
2920
2921 local_got_offsets = elf_local_got_offsets (input_bfd);
2922
2923 splt = sgot = NULL;
2924 if (dynobj != NULL)
2925 {
2926 splt = bfd_get_section_by_name (dynobj, ".plt");
2927 sgot = bfd_get_section_by_name (dynobj, ".got");
2928 }
2929
2930 for (; rel < relend; rel++)
2931 {
2932 enum elf_ppc_reloc_type r_type = (enum elf_ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
2933 bfd_vma offset = rel->r_offset;
2934 bfd_vma addend = rel->r_addend;
2935 bfd_reloc_status_type r = bfd_reloc_other;
2936 Elf_Internal_Sym *sym = (Elf_Internal_Sym *) 0;
2937 asection *sec = (asection *) 0;
2938 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) 0;
2939 const char *sym_name = (const char *) 0;
2940 reloc_howto_type *howto;
2941 unsigned long r_symndx;
2942 bfd_vma relocation;
2943 int will_become_local;
2944
2945 /* Unknown relocation handling */
2946 if ((unsigned) r_type >= (unsigned) R_PPC_max
2947 || !ppc_elf_howto_table[(int) r_type])
2948 {
2949 (*_bfd_error_handler) (_("%s: unknown relocation type %d"),
2950 bfd_archive_filename (input_bfd),
2951 (int) r_type);
2952
2953 bfd_set_error (bfd_error_bad_value);
2954 ret = false;
2955 continue;
2956 }
2957
2958 howto = ppc_elf_howto_table[(int) r_type];
2959 r_symndx = ELF32_R_SYM (rel->r_info);
2960
2961 if (info->relocateable)
2962 {
2963 /* This is a relocateable link. We don't have to change
2964 anything, unless the reloc is against a section symbol,
2965 in which case we have to adjust according to where the
2966 section symbol winds up in the output section. */
2967 if (r_symndx < symtab_hdr->sh_info)
2968 {
2969 sym = local_syms + r_symndx;
2970 if ((unsigned) ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2971 {
2972 sec = local_sections[r_symndx];
2973 addend = rel->r_addend += sec->output_offset + sym->st_value;
2974 }
2975 }
2976
2977 #ifdef DEBUG
2978 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
2979 howto->name,
2980 (int) r_type,
2981 r_symndx,
2982 (long) offset,
2983 (long) addend);
2984 #endif
2985 continue;
2986 }
2987
2988 /* This is a final link. */
2989 if (r_symndx < symtab_hdr->sh_info)
2990 {
2991 sym = local_syms + r_symndx;
2992 sec = local_sections[r_symndx];
2993 sym_name = "<local symbol>";
2994
2995 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
2996 addend = rel->r_addend;
2997 /* Relocs to local symbols are always resolved. */
2998 will_become_local = 1;
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
3008 /* Can this relocation be resolved immediately? */
3009 will_become_local = SYMBOL_REFERENCES_LOCAL (info, h);
3010
3011 if (h->root.type == bfd_link_hash_defined
3012 || h->root.type == bfd_link_hash_defweak)
3013 {
3014 sec = h->root.u.def.section;
3015 if (((r_type == R_PPC_PLT32
3016 || r_type == R_PPC_PLTREL24)
3017 && splt != NULL
3018 && h->plt.offset != (bfd_vma) -1)
3019 || (r_type == R_PPC_LOCAL24PC
3020 && sec->output_section == NULL)
3021 || ((r_type == R_PPC_GOT16
3022 || r_type == R_PPC_GOT16_LO
3023 || r_type == R_PPC_GOT16_HI
3024 || r_type == R_PPC_GOT16_HA)
3025 && elf_hash_table (info)->dynamic_sections_created
3026 && (! info->shared || ! will_become_local))
3027 || (info->shared
3028 && ! will_become_local
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_COPY
3047 || r_type == R_PPC_GLOB_DAT
3048 || r_type == R_PPC_JMP_SLOT
3049 || r_type == R_PPC_UADDR32
3050 || r_type == R_PPC_UADDR16
3051 || r_type == R_PPC_SDAREL16
3052 || r_type == R_PPC_EMB_NADDR32
3053 || r_type == R_PPC_EMB_NADDR16
3054 || r_type == R_PPC_EMB_NADDR16_LO
3055 || r_type == R_PPC_EMB_NADDR16_HI
3056 || r_type == R_PPC_EMB_NADDR16_HA
3057 || r_type == R_PPC_EMB_SDAI16
3058 || r_type == R_PPC_EMB_SDA2I16
3059 || r_type == R_PPC_EMB_SDA2REL
3060 || r_type == R_PPC_EMB_SDA21
3061 || r_type == R_PPC_EMB_MRKREF
3062 || r_type == R_PPC_EMB_BIT_FLD
3063 || r_type == R_PPC_EMB_RELSDA
3064 || ((r_type == R_PPC_REL24
3065 || r_type == R_PPC_REL32
3066 || r_type == R_PPC_REL14
3067 || r_type == R_PPC_REL14_BRTAKEN
3068 || r_type == R_PPC_REL14_BRNTAKEN
3069 || r_type == R_PPC_RELATIVE)
3070 && strcmp (h->root.root.string,
3071 "_GLOBAL_OFFSET_TABLE_") != 0))))
3072 {
3073 /* In these cases, we don't need the relocation
3074 value. We check specially because in some
3075 obscure cases sec->output_section will be NULL. */
3076 relocation = 0;
3077 }
3078 else if (sec->output_section == NULL)
3079 {
3080 (*_bfd_error_handler)
3081 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
3082 bfd_archive_filename (input_bfd), h->root.root.string,
3083 bfd_get_section_name (input_bfd, input_section));
3084 relocation = 0;
3085 }
3086 else
3087 relocation = (h->root.u.def.value
3088 + sec->output_section->vma
3089 + sec->output_offset);
3090 }
3091 else if (h->root.type == bfd_link_hash_undefweak)
3092 relocation = 0;
3093 else if (info->shared
3094 && (!info->symbolic || info->allow_shlib_undefined)
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_archive_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 case (int) R_PPC_NONE:
3125 continue;
3126
3127 /* Relocations that need no special processing. */
3128 case (int) R_PPC_LOCAL24PC:
3129 /* It makes no sense to point a local relocation
3130 at a symbol not in this object. */
3131 if (h != NULL
3132 && (h->root.type == bfd_link_hash_defined
3133 || h->root.type == bfd_link_hash_defweak)
3134 && sec->output_section == NULL)
3135 {
3136 if (! (*info->callbacks->undefined_symbol) (info,
3137 h->root.root.string,
3138 input_bfd,
3139 input_section,
3140 rel->r_offset,
3141 true))
3142 return false;
3143 continue;
3144 }
3145 break;
3146
3147 /* Relocations that may need to be propagated if this is a shared
3148 object. */
3149 case (int) R_PPC_REL24:
3150 case (int) R_PPC_REL32:
3151 case (int) R_PPC_REL14:
3152 /* If these relocations are not to a named symbol, they can be
3153 handled right here, no need to bother the dynamic linker. */
3154 if (h == NULL
3155 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3156 || SYMBOL_REFERENCES_LOCAL (info, h))
3157 break;
3158 /* fall through */
3159
3160 /* Relocations that always need to be propagated if this is a shared
3161 object. */
3162 case (int) R_PPC_ADDR32:
3163 case (int) R_PPC_ADDR24:
3164 case (int) R_PPC_ADDR16:
3165 case (int) R_PPC_ADDR16_LO:
3166 case (int) R_PPC_ADDR16_HI:
3167 case (int) R_PPC_ADDR16_HA:
3168 case (int) R_PPC_ADDR14:
3169 case (int) R_PPC_UADDR32:
3170 case (int) R_PPC_UADDR16:
3171 if (info->shared && r_symndx != 0)
3172 {
3173 Elf_Internal_Rela outrel;
3174 boolean skip;
3175
3176 #ifdef DEBUG
3177 fprintf (stderr, "ppc_elf_relocate_section need to create relocation for %s\n",
3178 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
3179 #endif
3180
3181 /* When generating a shared object, these relocations
3182 are copied into the output file to be resolved at run
3183 time. */
3184
3185 if (sreloc == NULL)
3186 {
3187 const char *name;
3188
3189 name = (bfd_elf_string_from_elf_section
3190 (input_bfd,
3191 elf_elfheader (input_bfd)->e_shstrndx,
3192 elf_section_data (input_section)->rel_hdr.sh_name));
3193 if (name == NULL)
3194 return false;
3195
3196 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
3197 && strcmp (bfd_get_section_name (input_bfd,
3198 input_section),
3199 name + 5) == 0);
3200
3201 sreloc = bfd_get_section_by_name (dynobj, name);
3202 BFD_ASSERT (sreloc != NULL);
3203 }
3204
3205 skip = false;
3206
3207 outrel.r_offset =
3208 _bfd_elf_section_offset (output_bfd, info, input_section,
3209 rel->r_offset);
3210 if (outrel.r_offset == (bfd_vma) -1)
3211 skip = true;
3212 outrel.r_offset += (input_section->output_section->vma
3213 + input_section->output_offset);
3214
3215 if (skip)
3216 memset (&outrel, 0, sizeof outrel);
3217 /* h->dynindx may be -1 if this symbol was marked to
3218 become local. */
3219 else if (! will_become_local)
3220 {
3221 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3222 outrel.r_addend = rel->r_addend;
3223 }
3224 else
3225 {
3226 if (r_type == R_PPC_ADDR32)
3227 {
3228 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3229 outrel.r_addend = relocation + rel->r_addend;
3230 }
3231 else
3232 {
3233 long indx;
3234
3235 if (h == NULL)
3236 sec = local_sections[r_symndx];
3237 else
3238 {
3239 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3240 || (h->root.type
3241 == bfd_link_hash_defweak));
3242 sec = h->root.u.def.section;
3243 }
3244 if (sec != NULL && bfd_is_abs_section (sec))
3245 indx = 0;
3246 else if (sec == NULL || sec->owner == NULL)
3247 {
3248 bfd_set_error (bfd_error_bad_value);
3249 return false;
3250 }
3251 else
3252 {
3253 asection *osec;
3254
3255 osec = sec->output_section;
3256 indx = elf_section_data (osec)->dynindx;
3257 BFD_ASSERT (indx > 0);
3258 #ifdef DEBUG
3259 if (indx <= 0)
3260 {
3261 printf ("indx=%d section=%s flags=%08x name=%s\n",
3262 indx, osec->name, osec->flags,
3263 h->root.root.string);
3264 }
3265 #endif
3266 }
3267
3268 outrel.r_info = ELF32_R_INFO (indx, r_type);
3269 outrel.r_addend = relocation + rel->r_addend;
3270 }
3271 }
3272
3273 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
3274 (((Elf32_External_Rela *)
3275 sreloc->contents)
3276 + sreloc->reloc_count));
3277 ++sreloc->reloc_count;
3278
3279 /* This reloc will be computed at runtime, so there's no
3280 need to do anything now, unless this is a RELATIVE
3281 reloc in an unallocated section. */
3282 if (skip
3283 || (input_section->flags & SEC_ALLOC) != 0
3284 || ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE)
3285 continue;
3286 }
3287
3288 /* Arithmetic adjust relocations that aren't going into a
3289 shared object. */
3290 if (r_type == R_PPC_ADDR16_HA
3291 /* It's just possible that this symbol is a weak symbol
3292 that's not actually defined anywhere. In that case,
3293 'sec' would be NULL, and we should leave the symbol
3294 alone (it will be set to zero elsewhere in the link). */
3295 && sec != NULL)
3296 {
3297 addend += ((relocation + addend) & 0x8000) << 1;
3298 }
3299 break;
3300
3301 /* branch taken prediction relocations */
3302 case (int) R_PPC_ADDR14_BRTAKEN:
3303 case (int) R_PPC_REL14_BRTAKEN:
3304 insn = bfd_get_32 (output_bfd, contents + offset);
3305 if ((relocation - offset) & 0x8000)
3306 insn &= ~BRANCH_PREDICT_BIT;
3307 else
3308 insn |= BRANCH_PREDICT_BIT;
3309 bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
3310 break;
3311
3312 /* branch not taken predicition relocations */
3313 case (int) R_PPC_ADDR14_BRNTAKEN:
3314 case (int) R_PPC_REL14_BRNTAKEN:
3315 insn = bfd_get_32 (output_bfd, contents + offset);
3316 if ((relocation - offset) & 0x8000)
3317 insn |= BRANCH_PREDICT_BIT;
3318 else
3319 insn &= ~BRANCH_PREDICT_BIT;
3320 bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
3321 break;
3322
3323 /* GOT16 relocations */
3324 case (int) R_PPC_GOT16:
3325 case (int) R_PPC_GOT16_LO:
3326 case (int) R_PPC_GOT16_HI:
3327 case (int) R_PPC_GOT16_HA:
3328 /* Relocation is to the entry for this symbol in the global
3329 offset table. */
3330 BFD_ASSERT (sgot != NULL);
3331
3332 if (h != NULL)
3333 {
3334 bfd_vma off;
3335
3336 off = h->got.offset;
3337 BFD_ASSERT (off != (bfd_vma) -1);
3338
3339 if (! elf_hash_table (info)->dynamic_sections_created
3340 || (info->shared
3341 && SYMBOL_REFERENCES_LOCAL (info, h)))
3342 {
3343 /* This is actually a static link, or it is a
3344 -Bsymbolic link and the symbol is defined
3345 locally. We must initialize this entry in the
3346 global offset table. Since the offset must
3347 always be a multiple of 4, we use the least
3348 significant bit to record whether we have
3349 initialized it already.
3350
3351 When doing a dynamic link, we create a .rela.got
3352 relocation entry to initialize the value. This
3353 is done in the finish_dynamic_symbol routine. */
3354 if ((off & 1) != 0)
3355 off &= ~1;
3356 else
3357 {
3358 bfd_put_32 (output_bfd, relocation,
3359 sgot->contents + off);
3360 h->got.offset |= 1;
3361 }
3362 }
3363
3364 relocation = sgot->output_offset + off - 4;
3365 }
3366 else
3367 {
3368 bfd_vma off;
3369
3370 BFD_ASSERT (local_got_offsets != NULL
3371 && local_got_offsets[r_symndx] != (bfd_vma) -1);
3372
3373 off = local_got_offsets[r_symndx];
3374
3375 /* The offset must always be a multiple of 4. We use
3376 the least significant bit to record whether we have
3377 already processed this entry. */
3378 if ((off & 1) != 0)
3379 off &= ~1;
3380 else
3381 {
3382 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
3383
3384 if (info->shared)
3385 {
3386 asection *srelgot;
3387 Elf_Internal_Rela outrel;
3388
3389 /* We need to generate a R_PPC_RELATIVE reloc
3390 for the dynamic linker. */
3391 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
3392 BFD_ASSERT (srelgot != NULL);
3393
3394 outrel.r_offset = (sgot->output_section->vma
3395 + sgot->output_offset
3396 + off);
3397 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3398 outrel.r_addend = relocation;
3399 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
3400 (((Elf32_External_Rela *)
3401 srelgot->contents)
3402 + srelgot->reloc_count));
3403 ++srelgot->reloc_count;
3404 }
3405
3406 local_got_offsets[r_symndx] |= 1;
3407 }
3408
3409 relocation = sgot->output_offset + off - 4;
3410 }
3411 break;
3412
3413 /* Indirect .sdata relocation */
3414 case (int) R_PPC_EMB_SDAI16:
3415 BFD_ASSERT (sdata != NULL);
3416 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3417 sdata, h, relocation, rel,
3418 R_PPC_RELATIVE);
3419 break;
3420
3421 /* Indirect .sdata2 relocation */
3422 case (int) R_PPC_EMB_SDA2I16:
3423 BFD_ASSERT (sdata2 != NULL);
3424 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3425 sdata2, h, relocation, rel,
3426 R_PPC_RELATIVE);
3427 break;
3428
3429 /* Handle the TOC16 reloc. We want to use the offset within the .got
3430 section, not the actual VMA. This is appropriate when generating
3431 an embedded ELF object, for which the .got section acts like the
3432 AIX .toc section. */
3433 case (int) R_PPC_TOC16: /* phony GOT16 relocations */
3434 BFD_ASSERT (sec != (asection *) 0);
3435 BFD_ASSERT (bfd_is_und_section (sec)
3436 || strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
3437 || strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0)
3438
3439 addend -= sec->output_section->vma + sec->output_offset + 0x8000;
3440 break;
3441
3442 case (int) R_PPC_PLTREL24:
3443 /* Relocation is to the entry for this symbol in the
3444 procedure linkage table. */
3445 BFD_ASSERT (h != NULL);
3446
3447 if (h->plt.offset == (bfd_vma) -1
3448 || splt == NULL)
3449 {
3450 /* We didn't make a PLT entry for this symbol. This
3451 happens when statically linking PIC code, or when
3452 using -Bsymbolic. */
3453 break;
3454 }
3455
3456 relocation = (splt->output_section->vma
3457 + splt->output_offset
3458 + h->plt.offset);
3459 break;
3460
3461 /* relocate against _SDA_BASE_ */
3462 case (int) R_PPC_SDAREL16:
3463 {
3464 const char *name;
3465
3466 BFD_ASSERT (sec != (asection *) 0);
3467 name = bfd_get_section_name (abfd, sec->output_section);
3468 if (strcmp (name, ".sdata") != 0
3469 && strcmp (name, ".sbss") != 0)
3470 {
3471 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3472 bfd_archive_filename (input_bfd),
3473 sym_name,
3474 ppc_elf_howto_table[(int) r_type]->name,
3475 name);
3476 }
3477 addend -= (sdata->sym_hash->root.u.def.value
3478 + sdata->sym_hash->root.u.def.section->output_section->vma
3479 + sdata->sym_hash->root.u.def.section->output_offset);
3480 }
3481 break;
3482
3483 /* relocate against _SDA2_BASE_ */
3484 case (int) R_PPC_EMB_SDA2REL:
3485 {
3486 const char *name;
3487
3488 BFD_ASSERT (sec != (asection *) 0);
3489 name = bfd_get_section_name (abfd, sec->output_section);
3490 if (strcmp (name, ".sdata2") != 0 && strcmp (name, ".sbss2") != 0)
3491 {
3492 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3493 bfd_archive_filename (input_bfd),
3494 sym_name,
3495 ppc_elf_howto_table[(int) r_type]->name,
3496 name);
3497
3498 bfd_set_error (bfd_error_bad_value);
3499 ret = false;
3500 continue;
3501 }
3502 addend -= (sdata2->sym_hash->root.u.def.value
3503 + sdata2->sym_hash->root.u.def.section->output_section->vma
3504 + sdata2->sym_hash->root.u.def.section->output_offset);
3505 }
3506 break;
3507
3508 /* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */
3509 case (int) R_PPC_EMB_SDA21:
3510 case (int) R_PPC_EMB_RELSDA:
3511 {
3512 const char *name;
3513 int reg;
3514
3515 BFD_ASSERT (sec != (asection *) 0);
3516 name = bfd_get_section_name (abfd, sec->output_section);
3517 if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0)
3518 {
3519 reg = 13;
3520 addend -= (sdata->sym_hash->root.u.def.value
3521 + sdata->sym_hash->root.u.def.section->output_section->vma
3522 + sdata->sym_hash->root.u.def.section->output_offset);
3523 }
3524
3525 else if (strcmp (name, ".sdata2") == 0
3526 || strcmp (name, ".sbss2") == 0)
3527 {
3528 reg = 2;
3529 addend -= (sdata2->sym_hash->root.u.def.value
3530 + sdata2->sym_hash->root.u.def.section->output_section->vma
3531 + sdata2->sym_hash->root.u.def.section->output_offset);
3532 }
3533
3534 else if (strcmp (name, ".PPC.EMB.sdata0") == 0
3535 || strcmp (name, ".PPC.EMB.sbss0") == 0)
3536 {
3537 reg = 0;
3538 }
3539
3540 else
3541 {
3542 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3543 bfd_archive_filename (input_bfd),
3544 sym_name,
3545 ppc_elf_howto_table[(int) r_type]->name,
3546 name);
3547
3548 bfd_set_error (bfd_error_bad_value);
3549 ret = false;
3550 continue;
3551 }
3552
3553 if (r_type == R_PPC_EMB_SDA21)
3554 { /* fill in register field */
3555 insn = bfd_get_32 (output_bfd, contents + offset);
3556 insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT);
3557 bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
3558 }
3559 }
3560 break;
3561
3562 /* Relocate against the beginning of the section */
3563 case (int) R_PPC_SECTOFF:
3564 case (int) R_PPC_SECTOFF_LO:
3565 case (int) R_PPC_SECTOFF_HI:
3566 BFD_ASSERT (sec != (asection *) 0);
3567 addend -= sec->output_section->vma;
3568 break;
3569
3570 case (int) R_PPC_SECTOFF_HA:
3571 BFD_ASSERT (sec != (asection *) 0);
3572 addend -= sec->output_section->vma;
3573 addend += ((relocation + addend) & 0x8000) << 1;
3574 break;
3575
3576 /* Negative relocations */
3577 case (int) R_PPC_EMB_NADDR32:
3578 case (int) R_PPC_EMB_NADDR16:
3579 case (int) R_PPC_EMB_NADDR16_LO:
3580 case (int) R_PPC_EMB_NADDR16_HI:
3581 addend -= 2 * relocation;
3582 break;
3583
3584 case (int) R_PPC_EMB_NADDR16_HA:
3585 addend -= 2 * relocation;
3586 addend += ((relocation + addend) & 0x8000) << 1;
3587 break;
3588
3589 /* NOP relocation that prevents garbage collecting linkers from omitting a
3590 reference. */
3591 case (int) R_PPC_EMB_MRKREF:
3592 continue;
3593
3594 case (int) R_PPC_COPY:
3595 case (int) R_PPC_GLOB_DAT:
3596 case (int) R_PPC_JMP_SLOT:
3597 case (int) R_PPC_RELATIVE:
3598 case (int) R_PPC_PLT32:
3599 case (int) R_PPC_PLTREL32:
3600 case (int) R_PPC_PLT16_LO:
3601 case (int) R_PPC_PLT16_HI:
3602 case (int) R_PPC_PLT16_HA:
3603 case (int) R_PPC_EMB_RELSEC16:
3604 case (int) R_PPC_EMB_RELST_LO:
3605 case (int) R_PPC_EMB_RELST_HI:
3606 case (int) R_PPC_EMB_RELST_HA:
3607 case (int) R_PPC_EMB_BIT_FLD:
3608 (*_bfd_error_handler) (_("%s: Relocation %s is not yet supported for symbol %s."),
3609 bfd_archive_filename (input_bfd),
3610 ppc_elf_howto_table[(int) r_type]->name,
3611 sym_name);
3612
3613 bfd_set_error (bfd_error_invalid_operation);
3614 ret = false;
3615 continue;
3616
3617 case (int) R_PPC_GNU_VTINHERIT:
3618 case (int) R_PPC_GNU_VTENTRY:
3619 /* These are no-ops in the end. */
3620 continue;
3621 }
3622
3623 #ifdef DEBUG
3624 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
3625 howto->name,
3626 (int) r_type,
3627 sym_name,
3628 r_symndx,
3629 (long) offset,
3630 (long) addend);
3631 #endif
3632
3633 r = _bfd_final_link_relocate (howto,
3634 input_bfd,
3635 input_section,
3636 contents,
3637 offset,
3638 relocation,
3639 addend);
3640
3641 if (r == bfd_reloc_ok)
3642 ;
3643 else if (r == bfd_reloc_overflow)
3644 {
3645 const char *name;
3646
3647 if (h != NULL)
3648 {
3649 if (h->root.type == bfd_link_hash_undefweak
3650 && howto->pc_relative)
3651 {
3652 /* Assume this is a call protected by other code that
3653 detect the symbol is undefined. If this is the case,
3654 we can safely ignore the overflow. If not, the
3655 program is hosed anyway, and a little warning isn't
3656 going to help. */
3657
3658 continue;
3659 }
3660
3661 name = h->root.root.string;
3662 }
3663 else
3664 {
3665 name = bfd_elf_string_from_elf_section (input_bfd,
3666 symtab_hdr->sh_link,
3667 sym->st_name);
3668 if (name == NULL)
3669 continue;
3670 if (*name == '\0')
3671 name = bfd_section_name (input_bfd, sec);
3672 }
3673
3674 if (! (*info->callbacks->reloc_overflow) (info,
3675 name,
3676 howto->name,
3677 (bfd_vma) 0,
3678 input_bfd,
3679 input_section,
3680 offset))
3681 return false;
3682 }
3683 else
3684 ret = false;
3685 }
3686
3687 #ifdef DEBUG
3688 fprintf (stderr, "\n");
3689 #endif
3690
3691 return ret;
3692 }
3693
3694 static enum elf_reloc_type_class
3695 ppc_elf_reloc_type_class (rela)
3696 const Elf_Internal_Rela *rela;
3697 {
3698 switch ((int) ELF32_R_TYPE (rela->r_info))
3699 {
3700 case R_PPC_RELATIVE:
3701 return reloc_class_relative;
3702 case R_PPC_REL24:
3703 case R_PPC_ADDR24:
3704 case R_PPC_JMP_SLOT:
3705 return reloc_class_plt;
3706 case R_PPC_COPY:
3707 return reloc_class_copy;
3708 default:
3709 return reloc_class_normal;
3710 }
3711 }
3712 \f
3713 /* Support for core dump NOTE sections */
3714 static boolean
3715 ppc_elf_grok_prstatus (abfd, note)
3716 bfd *abfd;
3717 Elf_Internal_Note *note;
3718 {
3719 int offset;
3720 unsigned int raw_size;
3721
3722 switch (note->descsz)
3723 {
3724 default:
3725 return false;
3726
3727 case 268: /* Linux/PPC */
3728 /* pr_cursig */
3729 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3730
3731 /* pr_pid */
3732 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3733
3734 /* pr_reg */
3735 offset = 72;
3736 raw_size = 192;
3737
3738 break;
3739 }
3740
3741 /* Make a ".reg/999" section. */
3742 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3743 raw_size, note->descpos + offset);
3744 }
3745
3746 static boolean
3747 ppc_elf_grok_psinfo (abfd, note)
3748 bfd *abfd;
3749 Elf_Internal_Note *note;
3750 {
3751 switch (note->descsz)
3752 {
3753 default:
3754 return false;
3755
3756 case 128: /* Linux/PPC elf_prpsinfo */
3757 elf_tdata (abfd)->core_program
3758 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3759 elf_tdata (abfd)->core_command
3760 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3761 }
3762
3763 /* Note that for some reason, a spurious space is tacked
3764 onto the end of the args in some (at least one anyway)
3765 implementations, so strip it off if it exists. */
3766
3767 {
3768 char *command = elf_tdata (abfd)->core_command;
3769 int n = strlen (command);
3770
3771 if (0 < n && command[n - 1] == ' ')
3772 command[n - 1] = '\0';
3773 }
3774
3775 return true;
3776 }
3777 \f
3778 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
3779 #define TARGET_LITTLE_NAME "elf32-powerpcle"
3780 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
3781 #define TARGET_BIG_NAME "elf32-powerpc"
3782 #define ELF_ARCH bfd_arch_powerpc
3783 #define ELF_MACHINE_CODE EM_PPC
3784 #define ELF_MAXPAGESIZE 0x10000
3785 #define elf_info_to_howto ppc_elf_info_to_howto
3786
3787 #ifdef EM_CYGNUS_POWERPC
3788 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
3789 #endif
3790
3791 #ifdef EM_PPC_OLD
3792 #define ELF_MACHINE_ALT2 EM_PPC_OLD
3793 #endif
3794
3795 #define elf_backend_plt_not_loaded 1
3796 #define elf_backend_got_symbol_offset 4
3797 #define elf_backend_can_gc_sections 1
3798 #define elf_backend_can_refcount 1
3799 #define elf_backend_got_header_size 12
3800 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
3801
3802 #define bfd_elf32_bfd_copy_private_bfd_data ppc_elf_copy_private_bfd_data
3803 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
3804 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
3805 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
3806 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
3807 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
3808
3809 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
3810 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
3811 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
3812 #define elf_backend_relocate_section ppc_elf_relocate_section
3813 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
3814 #define elf_backend_check_relocs ppc_elf_check_relocs
3815 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
3816 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
3817 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
3818 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
3819 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
3820 #define elf_backend_fake_sections ppc_elf_fake_sections
3821 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
3822 #define elf_backend_modify_segment_map ppc_elf_modify_segment_map
3823 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
3824 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
3825 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
3826
3827 #include "elf32-target.h"
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