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1999-09-13 Donn Terry <donn@interix.com>
[binutils.git] / bfd / elf32-ppc.c
blob1de197b224c9727b5f4ad813665e26dcd3b17d0d
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Cygnus Support.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 /* This file is based on a preliminary PowerPC ELF ABI. The
22 information may not match the final PowerPC ELF ABI. It includes
23 suggestions from the in-progress Embedded PowerPC ABI, and that
24 information may also not match. */
25
26 #include "bfd.h"
27 #include "sysdep.h"
28 #include "bfdlink.h"
29 #include "libbfd.h"
30 #include "elf-bfd.h"
31 #include "elf/ppc.h"
32
33 #define USE_RELA /* we want RELA relocations, not REL */
34
35
36 static reloc_howto_type *ppc_elf_reloc_type_lookup
37 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
38 static void ppc_elf_info_to_howto
39 PARAMS ((bfd *abfd, arelent *cache_ptr, Elf32_Internal_Rela *dst));
40 static void ppc_elf_howto_init PARAMS ((void));
41 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
42 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
43 static boolean ppc_elf_set_private_flags PARAMS ((bfd *, flagword));
44 static boolean ppc_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *));
45 static boolean ppc_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
46
47 static int ppc_elf_additional_program_headers PARAMS ((bfd *));
48 static boolean ppc_elf_modify_segment_map PARAMS ((bfd *));
49
50 static boolean ppc_elf_create_dynamic_sections
51 PARAMS ((bfd *, struct bfd_link_info *));
52
53 static boolean ppc_elf_section_from_shdr PARAMS ((bfd *,
54 Elf32_Internal_Shdr *,
55 char *));
56 static boolean ppc_elf_fake_sections
57 PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *));
58
59 static elf_linker_section_t *ppc_elf_create_linker_section
60 PARAMS ((bfd *abfd,
61 struct bfd_link_info *info,
62 enum elf_linker_section_enum));
63
64 static boolean ppc_elf_check_relocs PARAMS ((bfd *,
65 struct bfd_link_info *,
66 asection *,
67 const Elf_Internal_Rela *));
68
69 static asection * ppc_elf_gc_mark_hook PARAMS ((bfd *abfd,
70 struct bfd_link_info *info,
71 Elf_Internal_Rela *rel,
72 struct elf_link_hash_entry *h,
73 Elf_Internal_Sym *sym));
74
75 static boolean ppc_elf_gc_sweep_hook PARAMS ((bfd *abfd,
76 struct bfd_link_info *info,
77 asection *sec,
78 const Elf_Internal_Rela *relocs));
79
80 static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *,
81 struct elf_link_hash_entry *));
82
83 static boolean ppc_elf_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
84
85 static boolean ppc_elf_relocate_section PARAMS ((bfd *,
86 struct bfd_link_info *info,
87 bfd *,
88 asection *,
89 bfd_byte *,
90 Elf_Internal_Rela *relocs,
91 Elf_Internal_Sym *local_syms,
92 asection **));
93
94 static boolean ppc_elf_add_symbol_hook PARAMS ((bfd *,
95 struct bfd_link_info *,
96 const Elf_Internal_Sym *,
97 const char **,
98 flagword *,
99 asection **,
100 bfd_vma *));
101
102 static boolean ppc_elf_finish_dynamic_symbol PARAMS ((bfd *,
103 struct bfd_link_info *,
104 struct elf_link_hash_entry *,
105 Elf_Internal_Sym *));
106
107 static boolean ppc_elf_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
108
109 #define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */
110 #define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */
111 #define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */
112
113 /* The name of the dynamic interpreter. This is put in the .interp
114 section. */
115
116 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
117
118 /* The size in bytes of an entry in the procedure linkage table. */
119 #define PLT_ENTRY_SIZE 12
120 /* The initial size of the plt reserved for the dynamic linker. */
121 #define PLT_INITIAL_ENTRY_SIZE 72
122 /* The size of the gap between entries in the PLT. */
123 #define PLT_SLOT_SIZE 8
124 /* The number of single-slot PLT entries (the rest use two slots). */
125 #define PLT_NUM_SINGLE_ENTRIES 8192
126
127 \f
128 static reloc_howto_type *ppc_elf_howto_table[ (int)R_PPC_max ];
129
130 static reloc_howto_type ppc_elf_howto_raw[] =
131 {
132 /* This reloc does nothing. */
133 HOWTO (R_PPC_NONE, /* type */
134 0, /* rightshift */
135 2, /* size (0 = byte, 1 = short, 2 = long) */
136 32, /* bitsize */
137 false, /* pc_relative */
138 0, /* bitpos */
139 complain_overflow_bitfield, /* complain_on_overflow */
140 bfd_elf_generic_reloc, /* special_function */
141 "R_PPC_NONE", /* name */
142 false, /* partial_inplace */
143 0, /* src_mask */
144 0, /* dst_mask */
145 false), /* pcrel_offset */
146
147 /* A standard 32 bit relocation. */
148 HOWTO (R_PPC_ADDR32, /* type */
149 0, /* rightshift */
150 2, /* size (0 = byte, 1 = short, 2 = long) */
151 32, /* bitsize */
152 false, /* pc_relative */
153 0, /* bitpos */
154 complain_overflow_bitfield, /* complain_on_overflow */
155 bfd_elf_generic_reloc, /* special_function */
156 "R_PPC_ADDR32", /* name */
157 false, /* partial_inplace */
158 0, /* src_mask */
159 0xffffffff, /* dst_mask */
160 false), /* pcrel_offset */
161
162 /* An absolute 26 bit branch; the lower two bits must be zero.
163 FIXME: we don't check that, we just clear them. */
164 HOWTO (R_PPC_ADDR24, /* type */
165 0, /* rightshift */
166 2, /* size (0 = byte, 1 = short, 2 = long) */
167 26, /* bitsize */
168 false, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_bitfield, /* complain_on_overflow */
171 bfd_elf_generic_reloc, /* special_function */
172 "R_PPC_ADDR24", /* name */
173 false, /* partial_inplace */
174 0, /* src_mask */
175 0x3fffffc, /* dst_mask */
176 false), /* pcrel_offset */
177
178 /* A standard 16 bit relocation. */
179 HOWTO (R_PPC_ADDR16, /* type */
180 0, /* rightshift */
181 1, /* size (0 = byte, 1 = short, 2 = long) */
182 16, /* bitsize */
183 false, /* pc_relative */
184 0, /* bitpos */
185 complain_overflow_bitfield, /* complain_on_overflow */
186 bfd_elf_generic_reloc, /* special_function */
187 "R_PPC_ADDR16", /* name */
188 false, /* partial_inplace */
189 0, /* src_mask */
190 0xffff, /* dst_mask */
191 false), /* pcrel_offset */
192
193 /* A 16 bit relocation without overflow. */
194 HOWTO (R_PPC_ADDR16_LO, /* type */
195 0, /* rightshift */
196 1, /* size (0 = byte, 1 = short, 2 = long) */
197 16, /* bitsize */
198 false, /* pc_relative */
199 0, /* bitpos */
200 complain_overflow_dont,/* complain_on_overflow */
201 bfd_elf_generic_reloc, /* special_function */
202 "R_PPC_ADDR16_LO", /* name */
203 false, /* partial_inplace */
204 0, /* src_mask */
205 0xffff, /* dst_mask */
206 false), /* pcrel_offset */
207
208 /* The high order 16 bits of an address. */
209 HOWTO (R_PPC_ADDR16_HI, /* type */
210 16, /* rightshift */
211 1, /* size (0 = byte, 1 = short, 2 = long) */
212 16, /* bitsize */
213 false, /* pc_relative */
214 0, /* bitpos */
215 complain_overflow_dont, /* complain_on_overflow */
216 bfd_elf_generic_reloc, /* special_function */
217 "R_PPC_ADDR16_HI", /* name */
218 false, /* partial_inplace */
219 0, /* src_mask */
220 0xffff, /* dst_mask */
221 false), /* pcrel_offset */
222
223 /* The high order 16 bits of an address, plus 1 if the contents of
224 the low 16 bits, treated as a signed number, is negative. */
225 HOWTO (R_PPC_ADDR16_HA, /* type */
226 16, /* rightshift */
227 1, /* size (0 = byte, 1 = short, 2 = long) */
228 16, /* bitsize */
229 false, /* pc_relative */
230 0, /* bitpos */
231 complain_overflow_dont, /* complain_on_overflow */
232 ppc_elf_addr16_ha_reloc, /* special_function */
233 "R_PPC_ADDR16_HA", /* name */
234 false, /* partial_inplace */
235 0, /* src_mask */
236 0xffff, /* dst_mask */
237 false), /* pcrel_offset */
238
239 /* An absolute 16 bit branch; the lower two bits must be zero.
240 FIXME: we don't check that, we just clear them. */
241 HOWTO (R_PPC_ADDR14, /* type */
242 0, /* rightshift */
243 2, /* size (0 = byte, 1 = short, 2 = long) */
244 16, /* bitsize */
245 false, /* pc_relative */
246 0, /* bitpos */
247 complain_overflow_bitfield, /* complain_on_overflow */
248 bfd_elf_generic_reloc, /* special_function */
249 "R_PPC_ADDR14", /* name */
250 false, /* partial_inplace */
251 0, /* src_mask */
252 0xfffc, /* dst_mask */
253 false), /* pcrel_offset */
254
255 /* An absolute 16 bit branch, for which bit 10 should be set to
256 indicate that the branch is expected to be taken. The lower two
257 bits must be zero. */
258 HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */
259 0, /* rightshift */
260 2, /* size (0 = byte, 1 = short, 2 = long) */
261 16, /* bitsize */
262 false, /* pc_relative */
263 0, /* bitpos */
264 complain_overflow_bitfield, /* complain_on_overflow */
265 bfd_elf_generic_reloc, /* special_function */
266 "R_PPC_ADDR14_BRTAKEN",/* name */
267 false, /* partial_inplace */
268 0, /* src_mask */
269 0xfffc, /* dst_mask */
270 false), /* pcrel_offset */
271
272 /* An absolute 16 bit branch, for which bit 10 should be set to
273 indicate that the branch is not expected to be taken. The lower
274 two bits must be zero. */
275 HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */
276 0, /* rightshift */
277 2, /* size (0 = byte, 1 = short, 2 = long) */
278 16, /* bitsize */
279 false, /* pc_relative */
280 0, /* bitpos */
281 complain_overflow_bitfield, /* complain_on_overflow */
282 bfd_elf_generic_reloc, /* special_function */
283 "R_PPC_ADDR14_BRNTAKEN",/* name */
284 false, /* partial_inplace */
285 0, /* src_mask */
286 0xfffc, /* dst_mask */
287 false), /* pcrel_offset */
288
289 /* A relative 26 bit branch; the lower two bits must be zero. */
290 HOWTO (R_PPC_REL24, /* type */
291 0, /* rightshift */
292 2, /* size (0 = byte, 1 = short, 2 = long) */
293 26, /* bitsize */
294 true, /* pc_relative */
295 0, /* bitpos */
296 complain_overflow_signed, /* complain_on_overflow */
297 bfd_elf_generic_reloc, /* special_function */
298 "R_PPC_REL24", /* name */
299 false, /* partial_inplace */
300 0, /* src_mask */
301 0x3fffffc, /* dst_mask */
302 true), /* pcrel_offset */
303
304 /* A relative 16 bit branch; the lower two bits must be zero. */
305 HOWTO (R_PPC_REL14, /* type */
306 0, /* rightshift */
307 2, /* size (0 = byte, 1 = short, 2 = long) */
308 16, /* bitsize */
309 true, /* pc_relative */
310 0, /* bitpos */
311 complain_overflow_signed, /* complain_on_overflow */
312 bfd_elf_generic_reloc, /* special_function */
313 "R_PPC_REL14", /* name */
314 false, /* partial_inplace */
315 0, /* src_mask */
316 0xfffc, /* dst_mask */
317 true), /* pcrel_offset */
318
319 /* A relative 16 bit branch. Bit 10 should be set to indicate that
320 the branch is expected to be taken. The lower two bits must be
321 zero. */
322 HOWTO (R_PPC_REL14_BRTAKEN, /* type */
323 0, /* rightshift */
324 2, /* size (0 = byte, 1 = short, 2 = long) */
325 16, /* bitsize */
326 true, /* pc_relative */
327 0, /* bitpos */
328 complain_overflow_signed, /* complain_on_overflow */
329 bfd_elf_generic_reloc, /* special_function */
330 "R_PPC_REL14_BRTAKEN", /* name */
331 false, /* partial_inplace */
332 0, /* src_mask */
333 0xfffc, /* dst_mask */
334 true), /* pcrel_offset */
335
336 /* A relative 16 bit branch. Bit 10 should be set to indicate that
337 the branch is not expected to be taken. The lower two bits must
338 be zero. */
339 HOWTO (R_PPC_REL14_BRNTAKEN, /* type */
340 0, /* rightshift */
341 2, /* size (0 = byte, 1 = short, 2 = long) */
342 16, /* bitsize */
343 true, /* pc_relative */
344 0, /* bitpos */
345 complain_overflow_signed, /* complain_on_overflow */
346 bfd_elf_generic_reloc, /* special_function */
347 "R_PPC_REL14_BRNTAKEN",/* name */
348 false, /* partial_inplace */
349 0, /* src_mask */
350 0xfffc, /* dst_mask */
351 true), /* pcrel_offset */
352
353 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
354 symbol. */
355 HOWTO (R_PPC_GOT16, /* type */
356 0, /* rightshift */
357 1, /* size (0 = byte, 1 = short, 2 = long) */
358 16, /* bitsize */
359 false, /* pc_relative */
360 0, /* bitpos */
361 complain_overflow_signed, /* complain_on_overflow */
362 bfd_elf_generic_reloc, /* special_function */
363 "R_PPC_GOT16", /* name */
364 false, /* partial_inplace */
365 0, /* src_mask */
366 0xffff, /* dst_mask */
367 false), /* pcrel_offset */
368
369 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
370 the symbol. */
371 HOWTO (R_PPC_GOT16_LO, /* type */
372 0, /* rightshift */
373 1, /* size (0 = byte, 1 = short, 2 = long) */
374 16, /* bitsize */
375 false, /* pc_relative */
376 0, /* bitpos */
377 complain_overflow_dont, /* complain_on_overflow */
378 bfd_elf_generic_reloc, /* special_function */
379 "R_PPC_GOT16_LO", /* name */
380 false, /* partial_inplace */
381 0, /* src_mask */
382 0xffff, /* dst_mask */
383 false), /* pcrel_offset */
384
385 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
386 the symbol. */
387 HOWTO (R_PPC_GOT16_HI, /* type */
388 16, /* rightshift */
389 1, /* size (0 = byte, 1 = short, 2 = long) */
390 16, /* bitsize */
391 false, /* pc_relative */
392 0, /* bitpos */
393 complain_overflow_bitfield, /* complain_on_overflow */
394 bfd_elf_generic_reloc, /* special_function */
395 "R_PPC_GOT16_HI", /* name */
396 false, /* partial_inplace */
397 0, /* src_mask */
398 0xffff, /* dst_mask */
399 false), /* pcrel_offset */
400
401 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
402 the symbol. */
403 HOWTO (R_PPC_GOT16_HA, /* type */
404 16, /* rightshift */
405 1, /* size (0 = byte, 1 = short, 2 = long) */
406 16, /* bitsize */
407 false, /* pc_relative */
408 0, /* bitpos */
409 complain_overflow_bitfield, /* complain_on_overflow */
410 ppc_elf_addr16_ha_reloc, /* special_function */
411 "R_PPC_GOT16_HA", /* name */
412 false, /* partial_inplace */
413 0, /* src_mask */
414 0xffff, /* dst_mask */
415 false), /* pcrel_offset */
416
417 /* Like R_PPC_REL24, but referring to the procedure linkage table
418 entry for the symbol. */
419 HOWTO (R_PPC_PLTREL24, /* type */
420 0, /* rightshift */
421 2, /* size (0 = byte, 1 = short, 2 = long) */
422 26, /* bitsize */
423 true, /* pc_relative */
424 0, /* bitpos */
425 complain_overflow_signed, /* complain_on_overflow */
426 bfd_elf_generic_reloc, /* special_function */
427 "R_PPC_PLTREL24", /* name */
428 false, /* partial_inplace */
429 0, /* src_mask */
430 0x3fffffc, /* dst_mask */
431 true), /* pcrel_offset */
432
433 /* This is used only by the dynamic linker. The symbol should exist
434 both in the object being run and in some shared library. The
435 dynamic linker copies the data addressed by the symbol from the
436 shared library into the object, because the object being
437 run has to have the data at some particular address. */
438 HOWTO (R_PPC_COPY, /* type */
439 0, /* rightshift */
440 2, /* size (0 = byte, 1 = short, 2 = long) */
441 32, /* bitsize */
442 false, /* pc_relative */
443 0, /* bitpos */
444 complain_overflow_bitfield, /* complain_on_overflow */
445 bfd_elf_generic_reloc, /* special_function */
446 "R_PPC_COPY", /* name */
447 false, /* partial_inplace */
448 0, /* src_mask */
449 0, /* dst_mask */
450 false), /* pcrel_offset */
451
452 /* Like R_PPC_ADDR32, but used when setting global offset table
453 entries. */
454 HOWTO (R_PPC_GLOB_DAT, /* type */
455 0, /* rightshift */
456 2, /* size (0 = byte, 1 = short, 2 = long) */
457 32, /* bitsize */
458 false, /* pc_relative */
459 0, /* bitpos */
460 complain_overflow_bitfield, /* complain_on_overflow */
461 bfd_elf_generic_reloc, /* special_function */
462 "R_PPC_GLOB_DAT", /* name */
463 false, /* partial_inplace */
464 0, /* src_mask */
465 0xffffffff, /* dst_mask */
466 false), /* pcrel_offset */
467
468 /* Marks a procedure linkage table entry for a symbol. */
469 HOWTO (R_PPC_JMP_SLOT, /* type */
470 0, /* rightshift */
471 2, /* size (0 = byte, 1 = short, 2 = long) */
472 32, /* bitsize */
473 false, /* pc_relative */
474 0, /* bitpos */
475 complain_overflow_bitfield, /* complain_on_overflow */
476 bfd_elf_generic_reloc, /* special_function */
477 "R_PPC_JMP_SLOT", /* name */
478 false, /* partial_inplace */
479 0, /* src_mask */
480 0, /* dst_mask */
481 false), /* pcrel_offset */
482
483 /* Used only by the dynamic linker. When the object is run, this
484 longword is set to the load address of the object, plus the
485 addend. */
486 HOWTO (R_PPC_RELATIVE, /* type */
487 0, /* rightshift */
488 2, /* size (0 = byte, 1 = short, 2 = long) */
489 32, /* bitsize */
490 false, /* pc_relative */
491 0, /* bitpos */
492 complain_overflow_bitfield, /* complain_on_overflow */
493 bfd_elf_generic_reloc, /* special_function */
494 "R_PPC_RELATIVE", /* name */
495 false, /* partial_inplace */
496 0, /* src_mask */
497 0xffffffff, /* dst_mask */
498 false), /* pcrel_offset */
499
500 /* Like R_PPC_REL24, but uses the value of the symbol within the
501 object rather than the final value. Normally used for
502 _GLOBAL_OFFSET_TABLE_. */
503 HOWTO (R_PPC_LOCAL24PC, /* type */
504 0, /* rightshift */
505 2, /* size (0 = byte, 1 = short, 2 = long) */
506 26, /* bitsize */
507 true, /* pc_relative */
508 0, /* bitpos */
509 complain_overflow_signed, /* complain_on_overflow */
510 bfd_elf_generic_reloc, /* special_function */
511 "R_PPC_LOCAL24PC", /* name */
512 false, /* partial_inplace */
513 0, /* src_mask */
514 0x3fffffc, /* dst_mask */
515 true), /* pcrel_offset */
516
517 /* Like R_PPC_ADDR32, but may be unaligned. */
518 HOWTO (R_PPC_UADDR32, /* type */
519 0, /* rightshift */
520 2, /* size (0 = byte, 1 = short, 2 = long) */
521 32, /* bitsize */
522 false, /* pc_relative */
523 0, /* bitpos */
524 complain_overflow_bitfield, /* complain_on_overflow */
525 bfd_elf_generic_reloc, /* special_function */
526 "R_PPC_UADDR32", /* name */
527 false, /* partial_inplace */
528 0, /* src_mask */
529 0xffffffff, /* dst_mask */
530 false), /* pcrel_offset */
531
532 /* Like R_PPC_ADDR16, but may be unaligned. */
533 HOWTO (R_PPC_UADDR16, /* type */
534 0, /* rightshift */
535 1, /* size (0 = byte, 1 = short, 2 = long) */
536 16, /* bitsize */
537 false, /* pc_relative */
538 0, /* bitpos */
539 complain_overflow_bitfield, /* complain_on_overflow */
540 bfd_elf_generic_reloc, /* special_function */
541 "R_PPC_UADDR16", /* name */
542 false, /* partial_inplace */
543 0, /* src_mask */
544 0xffff, /* dst_mask */
545 false), /* pcrel_offset */
546
547 /* 32-bit PC relative */
548 HOWTO (R_PPC_REL32, /* type */
549 0, /* rightshift */
550 2, /* size (0 = byte, 1 = short, 2 = long) */
551 32, /* bitsize */
552 true, /* pc_relative */
553 0, /* bitpos */
554 complain_overflow_bitfield, /* complain_on_overflow */
555 bfd_elf_generic_reloc, /* special_function */
556 "R_PPC_REL32", /* name */
557 false, /* partial_inplace */
558 0, /* src_mask */
559 0xffffffff, /* dst_mask */
560 true), /* pcrel_offset */
561
562 /* 32-bit relocation to the symbol's procedure linkage table.
563 FIXME: not supported. */
564 HOWTO (R_PPC_PLT32, /* type */
565 0, /* rightshift */
566 2, /* size (0 = byte, 1 = short, 2 = long) */
567 32, /* bitsize */
568 false, /* pc_relative */
569 0, /* bitpos */
570 complain_overflow_bitfield, /* complain_on_overflow */
571 bfd_elf_generic_reloc, /* special_function */
572 "R_PPC_PLT32", /* name */
573 false, /* partial_inplace */
574 0, /* src_mask */
575 0, /* dst_mask */
576 false), /* pcrel_offset */
577
578 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
579 FIXME: not supported. */
580 HOWTO (R_PPC_PLTREL32, /* type */
581 0, /* rightshift */
582 2, /* size (0 = byte, 1 = short, 2 = long) */
583 32, /* bitsize */
584 true, /* pc_relative */
585 0, /* bitpos */
586 complain_overflow_bitfield, /* complain_on_overflow */
587 bfd_elf_generic_reloc, /* special_function */
588 "R_PPC_PLTREL32", /* name */
589 false, /* partial_inplace */
590 0, /* src_mask */
591 0, /* dst_mask */
592 true), /* pcrel_offset */
593
594 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
595 the symbol. */
596 HOWTO (R_PPC_PLT16_LO, /* type */
597 0, /* rightshift */
598 1, /* size (0 = byte, 1 = short, 2 = long) */
599 16, /* bitsize */
600 false, /* pc_relative */
601 0, /* bitpos */
602 complain_overflow_dont, /* complain_on_overflow */
603 bfd_elf_generic_reloc, /* special_function */
604 "R_PPC_PLT16_LO", /* name */
605 false, /* partial_inplace */
606 0, /* src_mask */
607 0xffff, /* dst_mask */
608 false), /* pcrel_offset */
609
610 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
611 the symbol. */
612 HOWTO (R_PPC_PLT16_HI, /* type */
613 16, /* rightshift */
614 1, /* size (0 = byte, 1 = short, 2 = long) */
615 16, /* bitsize */
616 false, /* pc_relative */
617 0, /* bitpos */
618 complain_overflow_bitfield, /* complain_on_overflow */
619 bfd_elf_generic_reloc, /* special_function */
620 "R_PPC_PLT16_HI", /* name */
621 false, /* partial_inplace */
622 0, /* src_mask */
623 0xffff, /* dst_mask */
624 false), /* pcrel_offset */
625
626 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
627 the symbol. */
628 HOWTO (R_PPC_PLT16_HA, /* type */
629 16, /* rightshift */
630 1, /* size (0 = byte, 1 = short, 2 = long) */
631 16, /* bitsize */
632 false, /* pc_relative */
633 0, /* bitpos */
634 complain_overflow_bitfield, /* complain_on_overflow */
635 ppc_elf_addr16_ha_reloc, /* special_function */
636 "R_PPC_PLT16_HA", /* name */
637 false, /* partial_inplace */
638 0, /* src_mask */
639 0xffff, /* dst_mask */
640 false), /* pcrel_offset */
641
642 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
643 small data items. */
644 HOWTO (R_PPC_SDAREL16, /* type */
645 0, /* rightshift */
646 1, /* size (0 = byte, 1 = short, 2 = long) */
647 16, /* bitsize */
648 false, /* pc_relative */
649 0, /* bitpos */
650 complain_overflow_signed, /* complain_on_overflow */
651 bfd_elf_generic_reloc, /* special_function */
652 "R_PPC_SDAREL16", /* name */
653 false, /* partial_inplace */
654 0, /* src_mask */
655 0xffff, /* dst_mask */
656 false), /* pcrel_offset */
657
658 /* 32-bit section relative relocation. */
659 HOWTO (R_PPC_SECTOFF, /* type */
660 0, /* rightshift */
661 2, /* size (0 = byte, 1 = short, 2 = long) */
662 32, /* bitsize */
663 true, /* pc_relative */
664 0, /* bitpos */
665 complain_overflow_bitfield, /* complain_on_overflow */
666 bfd_elf_generic_reloc, /* special_function */
667 "R_PPC_SECTOFF", /* name */
668 false, /* partial_inplace */
669 0, /* src_mask */
670 0, /* dst_mask */
671 true), /* pcrel_offset */
672
673 /* 16-bit lower half section relative relocation. */
674 HOWTO (R_PPC_SECTOFF_LO, /* type */
675 0, /* rightshift */
676 1, /* size (0 = byte, 1 = short, 2 = long) */
677 16, /* bitsize */
678 false, /* pc_relative */
679 0, /* bitpos */
680 complain_overflow_dont, /* complain_on_overflow */
681 bfd_elf_generic_reloc, /* special_function */
682 "R_PPC_SECTOFF_LO", /* name */
683 false, /* partial_inplace */
684 0, /* src_mask */
685 0xffff, /* dst_mask */
686 false), /* pcrel_offset */
687
688 /* 16-bit upper half section relative relocation. */
689 HOWTO (R_PPC_SECTOFF_HI, /* type */
690 16, /* rightshift */
691 1, /* size (0 = byte, 1 = short, 2 = long) */
692 16, /* bitsize */
693 false, /* pc_relative */
694 0, /* bitpos */
695 complain_overflow_bitfield, /* complain_on_overflow */
696 bfd_elf_generic_reloc, /* special_function */
697 "R_PPC_SECTOFF_HI", /* name */
698 false, /* partial_inplace */
699 0, /* src_mask */
700 0xffff, /* dst_mask */
701 false), /* pcrel_offset */
702
703 /* 16-bit upper half adjusted section relative relocation. */
704 HOWTO (R_PPC_SECTOFF_HA, /* type */
705 16, /* rightshift */
706 1, /* size (0 = byte, 1 = short, 2 = long) */
707 16, /* bitsize */
708 false, /* pc_relative */
709 0, /* bitpos */
710 complain_overflow_bitfield, /* complain_on_overflow */
711 ppc_elf_addr16_ha_reloc, /* special_function */
712 "R_PPC_SECTOFF_HA", /* name */
713 false, /* partial_inplace */
714 0, /* src_mask */
715 0xffff, /* dst_mask */
716 false), /* pcrel_offset */
717
718 /* The remaining relocs are from the Embedded ELF ABI, and are not
719 in the SVR4 ELF ABI. */
720
721 /* 32 bit value resulting from the addend minus the symbol */
722 HOWTO (R_PPC_EMB_NADDR32, /* type */
723 0, /* rightshift */
724 2, /* size (0 = byte, 1 = short, 2 = long) */
725 32, /* bitsize */
726 false, /* pc_relative */
727 0, /* bitpos */
728 complain_overflow_bitfield, /* complain_on_overflow */
729 bfd_elf_generic_reloc, /* special_function */
730 "R_PPC_EMB_NADDR32", /* name */
731 false, /* partial_inplace */
732 0, /* src_mask */
733 0xffffffff, /* dst_mask */
734 false), /* pcrel_offset */
735
736 /* 16 bit value resulting from the addend minus the symbol */
737 HOWTO (R_PPC_EMB_NADDR16, /* type */
738 0, /* rightshift */
739 1, /* size (0 = byte, 1 = short, 2 = long) */
740 16, /* bitsize */
741 false, /* pc_relative */
742 0, /* bitpos */
743 complain_overflow_bitfield, /* complain_on_overflow */
744 bfd_elf_generic_reloc, /* special_function */
745 "R_PPC_EMB_NADDR16", /* name */
746 false, /* partial_inplace */
747 0, /* src_mask */
748 0xffff, /* dst_mask */
749 false), /* pcrel_offset */
750
751 /* 16 bit value resulting from the addend minus the symbol */
752 HOWTO (R_PPC_EMB_NADDR16_LO, /* type */
753 0, /* rightshift */
754 1, /* size (0 = byte, 1 = short, 2 = long) */
755 16, /* bitsize */
756 false, /* pc_relative */
757 0, /* bitpos */
758 complain_overflow_dont,/* complain_on_overflow */
759 bfd_elf_generic_reloc, /* special_function */
760 "R_PPC_EMB_ADDR16_LO", /* name */
761 false, /* partial_inplace */
762 0, /* src_mask */
763 0xffff, /* dst_mask */
764 false), /* pcrel_offset */
765
766 /* The high order 16 bits of the addend minus the symbol */
767 HOWTO (R_PPC_EMB_NADDR16_HI, /* type */
768 16, /* rightshift */
769 1, /* size (0 = byte, 1 = short, 2 = long) */
770 16, /* bitsize */
771 false, /* pc_relative */
772 0, /* bitpos */
773 complain_overflow_dont, /* complain_on_overflow */
774 bfd_elf_generic_reloc, /* special_function */
775 "R_PPC_EMB_NADDR16_HI", /* name */
776 false, /* partial_inplace */
777 0, /* src_mask */
778 0xffff, /* dst_mask */
779 false), /* pcrel_offset */
780
781 /* The high order 16 bits of the result of the addend minus the address,
782 plus 1 if the contents of the low 16 bits, treated as a signed number,
783 is negative. */
784 HOWTO (R_PPC_EMB_NADDR16_HA, /* type */
785 16, /* rightshift */
786 1, /* size (0 = byte, 1 = short, 2 = long) */
787 16, /* bitsize */
788 false, /* pc_relative */
789 0, /* bitpos */
790 complain_overflow_dont, /* complain_on_overflow */
791 ppc_elf_addr16_ha_reloc, /* special_function */
792 "R_PPC_EMB_NADDR16_HA", /* name */
793 false, /* partial_inplace */
794 0, /* src_mask */
795 0xffff, /* dst_mask */
796 false), /* pcrel_offset */
797
798 /* 16 bit value resulting from allocating a 4 byte word to hold an
799 address in the .sdata section, and returning the offset from
800 _SDA_BASE_ for that relocation */
801 HOWTO (R_PPC_EMB_SDAI16, /* type */
802 0, /* rightshift */
803 1, /* size (0 = byte, 1 = short, 2 = long) */
804 16, /* bitsize */
805 false, /* pc_relative */
806 0, /* bitpos */
807 complain_overflow_bitfield, /* complain_on_overflow */
808 bfd_elf_generic_reloc, /* special_function */
809 "R_PPC_EMB_SDAI16", /* name */
810 false, /* partial_inplace */
811 0, /* src_mask */
812 0xffff, /* dst_mask */
813 false), /* pcrel_offset */
814
815 /* 16 bit value resulting from allocating a 4 byte word to hold an
816 address in the .sdata2 section, and returning the offset from
817 _SDA2_BASE_ for that relocation */
818 HOWTO (R_PPC_EMB_SDA2I16, /* type */
819 0, /* rightshift */
820 1, /* size (0 = byte, 1 = short, 2 = long) */
821 16, /* bitsize */
822 false, /* pc_relative */
823 0, /* bitpos */
824 complain_overflow_bitfield, /* complain_on_overflow */
825 bfd_elf_generic_reloc, /* special_function */
826 "R_PPC_EMB_SDA2I16", /* name */
827 false, /* partial_inplace */
828 0, /* src_mask */
829 0xffff, /* dst_mask */
830 false), /* pcrel_offset */
831
832 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
833 small data items. */
834 HOWTO (R_PPC_EMB_SDA2REL, /* type */
835 0, /* rightshift */
836 1, /* size (0 = byte, 1 = short, 2 = long) */
837 16, /* bitsize */
838 false, /* pc_relative */
839 0, /* bitpos */
840 complain_overflow_signed, /* complain_on_overflow */
841 bfd_elf_generic_reloc, /* special_function */
842 "R_PPC_EMB_SDA2REL", /* name */
843 false, /* partial_inplace */
844 0, /* src_mask */
845 0xffff, /* dst_mask */
846 false), /* pcrel_offset */
847
848 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
849 signed offset from the appropriate base, and filling in the register
850 field with the appropriate register (0, 2, or 13). */
851 HOWTO (R_PPC_EMB_SDA21, /* type */
852 0, /* rightshift */
853 2, /* size (0 = byte, 1 = short, 2 = long) */
854 16, /* bitsize */
855 false, /* pc_relative */
856 0, /* bitpos */
857 complain_overflow_signed, /* complain_on_overflow */
858 bfd_elf_generic_reloc, /* special_function */
859 "R_PPC_EMB_SDA21", /* name */
860 false, /* partial_inplace */
861 0, /* src_mask */
862 0xffff, /* dst_mask */
863 false), /* pcrel_offset */
864
865 /* Relocation not handled: R_PPC_EMB_MRKREF */
866 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
867 /* Relocation not handled: R_PPC_EMB_RELST_LO */
868 /* Relocation not handled: R_PPC_EMB_RELST_HI */
869 /* Relocation not handled: R_PPC_EMB_RELST_HA */
870 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
871
872 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
873 in the 16 bit signed offset from the appropriate base, and filling in the
874 register field with the appropriate register (0, 2, or 13). */
875 HOWTO (R_PPC_EMB_RELSDA, /* type */
876 0, /* rightshift */
877 1, /* size (0 = byte, 1 = short, 2 = long) */
878 16, /* bitsize */
879 true, /* pc_relative */
880 0, /* bitpos */
881 complain_overflow_signed, /* complain_on_overflow */
882 bfd_elf_generic_reloc, /* special_function */
883 "R_PPC_EMB_RELSDA", /* name */
884 false, /* partial_inplace */
885 0, /* src_mask */
886 0xffff, /* dst_mask */
887 false), /* pcrel_offset */
888
889 /* GNU extension to record C++ vtable hierarchy */
890 HOWTO (R_PPC_GNU_VTINHERIT, /* type */
891 0, /* rightshift */
892 0, /* size (0 = byte, 1 = short, 2 = long) */
893 0, /* bitsize */
894 false, /* pc_relative */
895 0, /* bitpos */
896 complain_overflow_dont, /* complain_on_overflow */
897 NULL, /* special_function */
898 "R_PPC_GNU_VTINHERIT", /* name */
899 false, /* partial_inplace */
900 0, /* src_mask */
901 0, /* dst_mask */
902 false), /* pcrel_offset */
903
904 /* GNU extension to record C++ vtable member usage */
905 HOWTO (R_PPC_GNU_VTENTRY, /* type */
906 0, /* rightshift */
907 0, /* size (0 = byte, 1 = short, 2 = long) */
908 0, /* bitsize */
909 false, /* pc_relative */
910 0, /* bitpos */
911 complain_overflow_dont, /* complain_on_overflow */
912 NULL, /* special_function */
913 "R_PPC_GNU_VTENTRY", /* name */
914 false, /* partial_inplace */
915 0, /* src_mask */
916 0, /* dst_mask */
917 false), /* pcrel_offset */
918
919 /* Phony reloc to handle AIX style TOC entries */
920 HOWTO (R_PPC_TOC16, /* type */
921 0, /* rightshift */
922 1, /* size (0 = byte, 1 = short, 2 = long) */
923 16, /* bitsize */
924 false, /* pc_relative */
925 0, /* bitpos */
926 complain_overflow_signed, /* complain_on_overflow */
927 bfd_elf_generic_reloc, /* special_function */
928 "R_PPC_TOC16", /* name */
929 false, /* partial_inplace */
930 0, /* src_mask */
931 0xffff, /* dst_mask */
932 false), /* pcrel_offset */
933 };
934
935 \f
936 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
937
938 static void
939 ppc_elf_howto_init ()
940 {
941 unsigned int i, type;
942
943 for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++)
944 {
945 type = ppc_elf_howto_raw[i].type;
946 BFD_ASSERT (type < sizeof(ppc_elf_howto_table) / sizeof(ppc_elf_howto_table[0]));
947 ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i];
948 }
949 }
950
951 \f
952 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
953
954 The MPC860, revision C0 or earlier contains a bug in the die.
955 If all of the following conditions are true, the next instruction
956 to be executed *may* be treated as a no-op.
957 1/ A forward branch is executed.
958 2/ The branch is predicted as not taken.
959 3/ The branch is taken.
960 4/ The branch is located in the last 5 words of a page.
961 (The EOP limit is 5 by default but may be specified as any value from 1-10.)
962
963 Our software solution is to detect these problematic branches in a
964 linker pass and modify them as follows:
965 1/ Unconditional branches - Since these are always predicted taken,
966 there is no problem and no action is required.
967 2/ Conditional backward branches - No problem, no action required.
968 3/ Conditional forward branches - Ensure that the "inverse prediction
969 bit" is set (ensure it is predicted taken).
970 4/ Conditional register branches - Ensure that the "y bit" is set
971 (ensure it is predicted taken).
972 */
973
974 /* Sort sections by address. */
975
976 static int
977 ppc_elf_sort_rela (arg1, arg2)
978 const void *arg1;
979 const void *arg2;
980 {
981 const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1;
982 const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2;
983
984 /* Sort by offset. */
985 return ((*rela1)->r_offset - (*rela2)->r_offset);
986 }
987
988 static boolean
989 ppc_elf_relax_section (abfd, isec, link_info, again)
990 bfd *abfd;
991 asection *isec;
992 struct bfd_link_info *link_info;
993 boolean *again;
994 {
995 #define PAGESIZE 0x1000
996
997 bfd_byte *contents = NULL;
998 bfd_byte *free_contents = NULL;
999 Elf_Internal_Rela *internal_relocs = NULL;
1000 Elf_Internal_Rela *free_relocs = NULL;
1001 Elf_Internal_Rela **rela_comb = NULL;
1002 int comb_curr, comb_count;
1003
1004 /* We never have to do this more than once per input section. */
1005 *again = false;
1006
1007 /* If needed, initialize this section's cooked size. */
1008 if (isec->_cooked_size == 0)
1009 isec->_cooked_size = isec->_raw_size;
1010
1011 /* We're only interested in text sections which overlap the
1012 troublesome area at the end of a page. */
1013 if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size)
1014 {
1015 bfd_vma dot, end_page, end_section;
1016 boolean section_modified;
1017
1018 /* Get the section contents. */
1019 /* Get cached copy if it exists. */
1020 if (elf_section_data (isec)->this_hdr.contents != NULL)
1021 contents = elf_section_data (isec)->this_hdr.contents;
1022 else
1023 {
1024 /* Go get them off disk. */
1025 contents = (bfd_byte *) bfd_malloc (isec->_raw_size);
1026 if (contents == NULL)
1027 goto error_return;
1028 free_contents = contents;
1029
1030 if (! bfd_get_section_contents (abfd, isec, contents,
1031 (file_ptr) 0, isec->_raw_size))
1032 goto error_return;
1033 }
1034
1035 comb_curr = 0;
1036 comb_count = 0;
1037 if (isec->reloc_count)
1038 {
1039 unsigned n;
1040
1041 /* Get a copy of the native relocations. */
1042 internal_relocs = _bfd_elf32_link_read_relocs (
1043 abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
1044 link_info->keep_memory);
1045 if (internal_relocs == NULL)
1046 goto error_return;
1047 if (! link_info->keep_memory)
1048 free_relocs = internal_relocs;
1049
1050 /* Setup a faster access method for the reloc info we need. */
1051 rela_comb = (Elf_Internal_Rela**)
1052 bfd_malloc (isec->reloc_count*sizeof(Elf_Internal_Rela*));
1053 if (rela_comb == NULL)
1054 goto error_return;
1055 for (n=0; n<isec->reloc_count; ++n)
1056 {
1057 long r_type;
1058
1059 r_type = ELF32_R_TYPE (internal_relocs[n].r_info);
1060 if (r_type < 0 || r_type >= (int)R_PPC_max)
1061 goto error_return;
1062
1063 /* Prologue constants are sometimes present in the ".text"
1064 sections and they can be identified by their associated relocation.
1065 We don't want to process those words and some others which
1066 can also be identified by their relocations. However, not all
1067 conditional branches will have a relocation so we will
1068 only ignore words that 1) have a reloc, and 2) the reloc
1069 is not applicable to a conditional branch.
1070 The array rela_comb is built here for use in the EOP scan loop. */
1071 switch (r_type)
1072 {
1073 case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */
1074 case R_PPC_REL14: /* relative cond. br. */
1075 case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */
1076 /* We should check the instruction. */
1077 break;
1078 default:
1079 /* The word is not a conditional branch - ignore it. */
1080 rela_comb[comb_count++] = &internal_relocs[n];
1081 break;
1082 }
1083 }
1084 if (comb_count > 1)
1085 qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela);
1086 }
1087
1088 /* Enumerate each EOP region that overlaps this section. */
1089 end_section = isec->vma + isec->_cooked_size;
1090 dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1;
1091 dot -= link_info->mpc860c0;
1092 section_modified = false;
1093 if (dot < isec->vma) /* Increment the start position if this section */
1094 dot = isec->vma; /* begins in the middle of its first EOP region. */
1095 for (;
1096 dot < end_section;
1097 dot += PAGESIZE, end_page += PAGESIZE)
1098 {
1099
1100 /* Check each word in this EOP region. */
1101 for (; dot < end_page; dot += 4)
1102 {
1103 bfd_vma isec_offset;
1104 unsigned long insn;
1105 boolean skip, modified;
1106
1107 /* Don't process this word if there is a relocation for it and
1108 the relocation indicates the word is not a conditional branch. */
1109 skip = false;
1110 isec_offset = dot - isec->vma;
1111 for (; comb_curr<comb_count; ++comb_curr)
1112 {
1113 bfd_vma r_offset;
1114
1115 r_offset = rela_comb[comb_curr]->r_offset;
1116 if (r_offset >= isec_offset)
1117 {
1118 if (r_offset == isec_offset) skip = true;
1119 break;
1120 }
1121 }
1122 if (skip) continue;
1123
1124 /* Check the current word for a problematic conditional branch. */
1125 #define BO0(insn) ((insn) & 0x02000000)
1126 #define BO2(insn) ((insn) & 0x00800000)
1127 #define BO4(insn) ((insn) & 0x00200000)
1128 insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset);
1129 modified = false;
1130 if ((insn & 0xFc000000) == 0x40000000)
1131 {
1132 /* Instruction is BCx */
1133 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1134 {
1135 bfd_vma target;
1136 /* This branch is predicted as "normal".
1137 If this is a forward branch, it is problematic. */
1138
1139 target = insn & 0x0000Fffc; /*extract*/
1140 target = (target ^ 0x8000) - 0x8000; /*sign extend*/
1141 if ((insn & 0x00000002) == 0)
1142 target += dot; /*convert to abs*/
1143 if (target > dot)
1144 {
1145 insn |= 0x00200000; /* set the prediction bit */
1146 modified = true;
1147 }
1148 }
1149 }
1150 else if ((insn & 0xFc00Fffe) == 0x4c000420)
1151 {
1152 /* Instruction is BCCTRx */
1153 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1154 {
1155 /* This branch is predicted as not-taken.
1156 If this is a forward branch, it is problematic.
1157 Since we can't tell statically if it will branch forward,
1158 always set the prediction bit. */
1159 insn |= 0x00200000; /* set the prediction bit */
1160 modified = true;
1161 }
1162 }
1163 else if ((insn & 0xFc00Fffe) == 0x4c000020)
1164 {
1165 /* Instruction is BCLRx */
1166 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1167 {
1168 /* This branch is predicted as not-taken.
1169 If this is a forward branch, it is problematic.
1170 Since we can't tell statically if it will branch forward,
1171 always set the prediction bit. */
1172 insn |= 0x00200000; /* set the prediction bit */
1173 modified = true;
1174 }
1175 }
1176 #undef BO0
1177 #undef BO2
1178 #undef BO4
1179 if (modified)
1180 {
1181 bfd_put_32 (abfd, insn, contents + isec_offset);
1182 section_modified = true;
1183 }
1184 }
1185 }
1186 if (section_modified)
1187 {
1188 elf_section_data (isec)->this_hdr.contents = contents;
1189 free_contents = NULL;
1190 }
1191 }
1192
1193 if (rela_comb != NULL)
1194 {
1195 free (rela_comb);
1196 rela_comb = NULL;
1197 }
1198
1199 if (free_relocs != NULL)
1200 {
1201 free (free_relocs);
1202 free_relocs = NULL;
1203 }
1204
1205 if (free_contents != NULL)
1206 {
1207 if (! link_info->keep_memory)
1208 free (free_contents);
1209 else
1210 {
1211 /* Cache the section contents for elf_link_input_bfd. */
1212 elf_section_data (isec)->this_hdr.contents = contents;
1213 }
1214 free_contents = NULL;
1215 }
1216
1217 return true;
1218
1219 error_return:
1220 if (rela_comb != NULL)
1221 free (rela_comb);
1222 if (free_relocs != NULL)
1223 free (free_relocs);
1224 if (free_contents != NULL)
1225 free (free_contents);
1226 return false;
1227 }
1228
1229 \f
1230 static reloc_howto_type *
1231 ppc_elf_reloc_type_lookup (abfd, code)
1232 bfd *abfd ATTRIBUTE_UNUSED;
1233 bfd_reloc_code_real_type code;
1234 {
1235 enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE;
1236
1237 if (!ppc_elf_howto_table[R_PPC_ADDR32])
1238 /* Initialize howto table if needed */
1239 ppc_elf_howto_init ();
1240
1241 switch ((int)code)
1242 {
1243 default:
1244 return (reloc_howto_type *)NULL;
1245
1246 case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break;
1247 case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break;
1248 case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break;
1249 case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break;
1250 case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break;
1251 case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break;
1252 case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break;
1253 case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break;
1254 case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break;
1255 case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break;
1256 case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break;
1257 case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break;
1258 case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break;
1259 case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break;
1260 case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break;
1261 case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break;
1262 case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break;
1263 case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break;
1264 case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break;
1265 case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break;
1266 case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break;
1267 case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break;
1268 case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break;
1269 case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break;
1270 case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break;
1271 case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break;
1272 case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break;
1273 case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break;
1274 case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break;
1275 case BFD_RELOC_32_BASEREL: ppc_reloc = R_PPC_SECTOFF; break;
1276 case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break;
1277 case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break;
1278 case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break;
1279 case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break;
1280 case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break;
1281 case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break;
1282 case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break;
1283 case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break;
1284 case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break;
1285 case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break;
1286 case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break;
1287 case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break;
1288 case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break;
1289 case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break;
1290 case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break;
1291 case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break;
1292 case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break;
1293 case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break;
1294 case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break;
1295 case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break;
1296 case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break;
1297 case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break;
1298 case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; break;
1299 }
1300
1301 return ppc_elf_howto_table[ (int)ppc_reloc ];
1302 };
1303
1304 /* Set the howto pointer for a PowerPC ELF reloc. */
1305
1306 static void
1307 ppc_elf_info_to_howto (abfd, cache_ptr, dst)
1308 bfd *abfd ATTRIBUTE_UNUSED;
1309 arelent *cache_ptr;
1310 Elf32_Internal_Rela *dst;
1311 {
1312 if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */
1313 ppc_elf_howto_init ();
1314
1315 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max);
1316 cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
1317 }
1318
1319 /* Handle the R_PPC_ADDR16_HA reloc. */
1320
1321 static bfd_reloc_status_type
1322 ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section,
1323 output_bfd, error_message)
1324 bfd *abfd ATTRIBUTE_UNUSED;
1325 arelent *reloc_entry;
1326 asymbol *symbol;
1327 PTR data ATTRIBUTE_UNUSED;
1328 asection *input_section;
1329 bfd *output_bfd;
1330 char **error_message ATTRIBUTE_UNUSED;
1331 {
1332 bfd_vma relocation;
1333
1334 if (output_bfd != NULL)
1335 {
1336 reloc_entry->address += input_section->output_offset;
1337 return bfd_reloc_ok;
1338 }
1339
1340 if (reloc_entry->address > input_section->_cooked_size)
1341 return bfd_reloc_outofrange;
1342
1343 if (bfd_is_com_section (symbol->section))
1344 relocation = 0;
1345 else
1346 relocation = symbol->value;
1347
1348 relocation += symbol->section->output_section->vma;
1349 relocation += symbol->section->output_offset;
1350 relocation += reloc_entry->addend;
1351
1352 reloc_entry->addend += (relocation & 0x8000) << 1;
1353
1354 return bfd_reloc_continue;
1355 }
1356
1357 /* Function to set whether a module needs the -mrelocatable bit set. */
1358
1359 static boolean
1360 ppc_elf_set_private_flags (abfd, flags)
1361 bfd *abfd;
1362 flagword flags;
1363 {
1364 BFD_ASSERT (!elf_flags_init (abfd)
1365 || elf_elfheader (abfd)->e_flags == flags);
1366
1367 elf_elfheader (abfd)->e_flags = flags;
1368 elf_flags_init (abfd) = true;
1369 return true;
1370 }
1371
1372 /* Copy backend specific data from one object module to another */
1373 static boolean
1374 ppc_elf_copy_private_bfd_data (ibfd, obfd)
1375 bfd *ibfd;
1376 bfd *obfd;
1377 {
1378 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1379 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1380 return true;
1381
1382 BFD_ASSERT (!elf_flags_init (obfd)
1383 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
1384
1385 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
1386 elf_flags_init (obfd) = true;
1387 return true;
1388 }
1389
1390 /* Merge backend specific data from an object file to the output
1391 object file when linking */
1392 static boolean
1393 ppc_elf_merge_private_bfd_data (ibfd, obfd)
1394 bfd *ibfd;
1395 bfd *obfd;
1396 {
1397 flagword old_flags;
1398 flagword new_flags;
1399 boolean error;
1400
1401 /* Check if we have the same endianess */
1402 if (ibfd->xvec->byteorder != obfd->xvec->byteorder
1403 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
1404 {
1405 const char *msg;
1406
1407 if (bfd_big_endian (ibfd))
1408 msg = _("%s: compiled for a big endian system and target is little endian");
1409 else
1410 msg = _("%s: compiled for a little endian system and target is big endian");
1411
1412 (*_bfd_error_handler) (msg, bfd_get_filename (ibfd));
1413
1414 bfd_set_error (bfd_error_wrong_format);
1415 return false;
1416 }
1417
1418 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1419 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1420 return true;
1421
1422 new_flags = elf_elfheader (ibfd)->e_flags;
1423 old_flags = elf_elfheader (obfd)->e_flags;
1424 if (!elf_flags_init (obfd)) /* First call, no flags set */
1425 {
1426 elf_flags_init (obfd) = true;
1427 elf_elfheader (obfd)->e_flags = new_flags;
1428 }
1429
1430 else if (new_flags == old_flags) /* Compatible flags are ok */
1431 ;
1432
1433 else /* Incompatible flags */
1434 {
1435 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked
1436 with either. */
1437 error = false;
1438 if ((new_flags & EF_PPC_RELOCATABLE) != 0
1439 && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0)
1440 {
1441 error = true;
1442 (*_bfd_error_handler)
1443 (_("%s: compiled with -mrelocatable and linked with modules compiled normally"),
1444 bfd_get_filename (ibfd));
1445 }
1446 else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
1447 && (old_flags & EF_PPC_RELOCATABLE) != 0)
1448 {
1449 error = true;
1450 (*_bfd_error_handler)
1451 (_("%s: compiled normally and linked with modules compiled with -mrelocatable"),
1452 bfd_get_filename (ibfd));
1453 }
1454
1455 /* The output is -mrelocatable-lib iff both the input files are. */
1456 if (! (new_flags & EF_PPC_RELOCATABLE_LIB))
1457 elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB;
1458
1459 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
1460 but each input file is either -mrelocatable or -mrelocatable-lib. */
1461 if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB)
1462 && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))
1463 && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)))
1464 elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE;
1465
1466 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */
1467 elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB);
1468
1469 new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1470 old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1471
1472 /* Warn about any other mismatches */
1473 if (new_flags != old_flags)
1474 {
1475 error = true;
1476 (*_bfd_error_handler)
1477 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
1478 bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
1479 }
1480
1481 if (error)
1482 {
1483 bfd_set_error (bfd_error_bad_value);
1484 return false;
1485 }
1486 }
1487
1488 return true;
1489 }
1490
1491 \f
1492 /* Handle a PowerPC specific section when reading an object file. This
1493 is called when elfcode.h finds a section with an unknown type. */
1494
1495 static boolean
1496 ppc_elf_section_from_shdr (abfd, hdr, name)
1497 bfd *abfd;
1498 Elf32_Internal_Shdr *hdr;
1499 char *name;
1500 {
1501 asection *newsect;
1502 flagword flags;
1503
1504 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
1505 return false;
1506
1507 newsect = hdr->bfd_section;
1508 flags = bfd_get_section_flags (abfd, newsect);
1509 if (hdr->sh_flags & SHF_EXCLUDE)
1510 flags |= SEC_EXCLUDE;
1511
1512 if (hdr->sh_type == SHT_ORDERED)
1513 flags |= SEC_SORT_ENTRIES;
1514
1515 bfd_set_section_flags (abfd, newsect, flags);
1516 return true;
1517 }
1518
1519 \f
1520 /* Set up any other section flags and such that may be necessary. */
1521
1522 static boolean
1523 ppc_elf_fake_sections (abfd, shdr, asect)
1524 bfd *abfd ATTRIBUTE_UNUSED;
1525 Elf32_Internal_Shdr *shdr;
1526 asection *asect;
1527 {
1528 if ((asect->flags & SEC_EXCLUDE) != 0)
1529 shdr->sh_flags |= SHF_EXCLUDE;
1530
1531 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
1532 shdr->sh_type = SHT_ORDERED;
1533
1534 return true;
1535 }
1536
1537 \f
1538 /* Create a special linker section */
1539 static elf_linker_section_t *
1540 ppc_elf_create_linker_section (abfd, info, which)
1541 bfd *abfd;
1542 struct bfd_link_info *info;
1543 enum elf_linker_section_enum which;
1544 {
1545 bfd *dynobj = elf_hash_table (info)->dynobj;
1546 elf_linker_section_t *lsect;
1547
1548 /* Record the first bfd section that needs the special section */
1549 if (!dynobj)
1550 dynobj = elf_hash_table (info)->dynobj = abfd;
1551
1552 /* If this is the first time, create the section */
1553 lsect = elf_linker_section (dynobj, which);
1554 if (!lsect)
1555 {
1556 elf_linker_section_t defaults;
1557 static elf_linker_section_t zero_section;
1558
1559 defaults = zero_section;
1560 defaults.which = which;
1561 defaults.hole_written_p = false;
1562 defaults.alignment = 2;
1563
1564 /* Both of these sections are (technically) created by the user
1565 putting data in them, so they shouldn't be marked
1566 SEC_LINKER_CREATED.
1567
1568 The linker creates them so it has somewhere to attach their
1569 respective symbols. In fact, if they were empty it would
1570 be OK to leave the symbol set to 0 (or any random number), because
1571 the appropriate register should never be used. */
1572 defaults.flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1573 | SEC_IN_MEMORY);
1574
1575 switch (which)
1576 {
1577 default:
1578 (*_bfd_error_handler) (_("%s: Unknown special linker type %d"),
1579 bfd_get_filename (abfd),
1580 (int)which);
1581
1582 bfd_set_error (bfd_error_bad_value);
1583 return (elf_linker_section_t *)0;
1584
1585 case LINKER_SECTION_SDATA: /* .sdata/.sbss section */
1586 defaults.name = ".sdata";
1587 defaults.rel_name = ".rela.sdata";
1588 defaults.bss_name = ".sbss";
1589 defaults.sym_name = "_SDA_BASE_";
1590 defaults.sym_offset = 32768;
1591 break;
1592
1593 case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */
1594 defaults.name = ".sdata2";
1595 defaults.rel_name = ".rela.sdata2";
1596 defaults.bss_name = ".sbss2";
1597 defaults.sym_name = "_SDA2_BASE_";
1598 defaults.sym_offset = 32768;
1599 defaults.flags |= SEC_READONLY;
1600 break;
1601 }
1602
1603 lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults);
1604 }
1605
1606 return lsect;
1607 }
1608
1609 \f
1610 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we need to bump up
1611 the number of section headers. */
1612
1613 static int
1614 ppc_elf_additional_program_headers (abfd)
1615 bfd *abfd;
1616 {
1617 asection *s;
1618 int ret;
1619
1620 ret = 0;
1621
1622 s = bfd_get_section_by_name (abfd, ".interp");
1623 if (s != NULL)
1624 ++ret;
1625
1626 s = bfd_get_section_by_name (abfd, ".sbss2");
1627 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1628 ++ret;
1629
1630 s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0");
1631 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1632 ++ret;
1633
1634 return ret;
1635 }
1636
1637 /* Modify the segment map if needed */
1638
1639 static boolean
1640 ppc_elf_modify_segment_map (abfd)
1641 bfd *abfd ATTRIBUTE_UNUSED;
1642 {
1643 return true;
1644 }
1645 \f
1646 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
1647 to output sections (just like _bfd_elf_create_dynamic_sections has
1648 to create .dynbss and .rela.bss). */
1649
1650 static boolean
1651 ppc_elf_create_dynamic_sections (abfd, info)
1652 bfd *abfd;
1653 struct bfd_link_info *info;
1654 {
1655 register asection *s;
1656 flagword flags;
1657
1658 if (!_bfd_elf_create_dynamic_sections(abfd, info))
1659 return false;
1660
1661 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1662 | SEC_LINKER_CREATED);
1663
1664 s = bfd_make_section (abfd, ".dynsbss");
1665 if (s == NULL
1666 || ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
1667 return false;
1668
1669 if (! info->shared)
1670 {
1671 s = bfd_make_section (abfd, ".rela.sbss");
1672 if (s == NULL
1673 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1674 || ! bfd_set_section_alignment (abfd, s, 2))
1675 return false;
1676 }
1677 return true;
1678 }
1679
1680 /* Adjust a symbol defined by a dynamic object and referenced by a
1681 regular object. The current definition is in some section of the
1682 dynamic object, but we're not including those sections. We have to
1683 change the definition to something the rest of the link can
1684 understand. */
1685
1686 static boolean
1687 ppc_elf_adjust_dynamic_symbol (info, h)
1688 struct bfd_link_info *info;
1689 struct elf_link_hash_entry *h;
1690 {
1691 bfd *dynobj = elf_hash_table (info)->dynobj;
1692 asection *s;
1693 unsigned int power_of_two;
1694 bfd_vma plt_offset;
1695
1696 #ifdef DEBUG
1697 fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string);
1698 #endif
1699
1700 /* Make sure we know what is going on here. */
1701 BFD_ASSERT (dynobj != NULL
1702 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
1703 || h->weakdef != NULL
1704 || ((h->elf_link_hash_flags
1705 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1706 && (h->elf_link_hash_flags
1707 & ELF_LINK_HASH_REF_REGULAR) != 0
1708 && (h->elf_link_hash_flags
1709 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
1710
1711
1712 /* If this is a function, put it in the procedure linkage table. We
1713 will fill in the contents of the procedure linkage table later,
1714 when we know the address of the .got section. */
1715 if (h->type == STT_FUNC
1716 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1717 {
1718 if (! elf_hash_table (info)->dynamic_sections_created
1719 || ((!info->shared || info->symbolic || h->dynindx == -1)
1720 && (h->elf_link_hash_flags
1721 & ELF_LINK_HASH_DEF_REGULAR) != 0)
1722 || (info->shared && h->plt.refcount <= 0))
1723 {
1724 /* A PLT entry is not required/allowed when:
1725
1726 1. We are not using ld.so; because then the PLT entry
1727 can't be set up, so we can't use one.
1728
1729 2. We know for certain that a symbol is defined in
1730 this object, because this object is the application,
1731 is linked with -Bsymbolic, or because the symbol is local.
1732
1733 3. GC has rendered the entry unused.
1734 Note, however, that in an executable all references to the
1735 symbol go to the PLT, so we can't turn it off in that case.
1736 ??? The correct thing to do here is to reference count
1737 all uses of the symbol, not just those to the GOT or PLT. */
1738 h->plt.offset = (bfd_vma) -1;
1739 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1740 return true;
1741 }
1742
1743 /* Make sure this symbol is output as a dynamic symbol. */
1744 if (h->dynindx == -1)
1745 {
1746 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1747 return false;
1748 }
1749 BFD_ASSERT (h->dynindx != -1);
1750
1751 s = bfd_get_section_by_name (dynobj, ".plt");
1752 BFD_ASSERT (s != NULL);
1753
1754 /* If this is the first .plt entry, make room for the special
1755 first entry. */
1756 if (s->_raw_size == 0)
1757 s->_raw_size += PLT_INITIAL_ENTRY_SIZE;
1758
1759 /* The PowerPC PLT is actually composed of two parts, the first part
1760 is 2 words (for a load and a jump), and then there is a remaining
1761 word available at the end. */
1762 plt_offset = (PLT_INITIAL_ENTRY_SIZE
1763 + (PLT_SLOT_SIZE
1764 * ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE)
1765 / PLT_ENTRY_SIZE)));
1766
1767 /* If this symbol is not defined in a regular file, and we are
1768 not generating a shared library, then set the symbol to this
1769 location in the .plt. This is required to make function
1770 pointers compare as equal between the normal executable and
1771 the shared library. */
1772 if (! info->shared
1773 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1774 {
1775 h->root.u.def.section = s;
1776 h->root.u.def.value = plt_offset;
1777 }
1778
1779 h->plt.offset = plt_offset;
1780
1781 /* Make room for this entry. After the 8192nd entry, room
1782 for two entries is allocated. */
1783 if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
1784 >= PLT_NUM_SINGLE_ENTRIES)
1785 s->_raw_size += 2 * PLT_ENTRY_SIZE;
1786 else
1787 s->_raw_size += PLT_ENTRY_SIZE;
1788
1789 /* We also need to make an entry in the .rela.plt section. */
1790 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1791 BFD_ASSERT (s != NULL);
1792 s->_raw_size += sizeof (Elf32_External_Rela);
1793
1794 return true;
1795 }
1796
1797 /* If this is a weak symbol, and there is a real definition, the
1798 processor independent code will have arranged for us to see the
1799 real definition first, and we can just use the same value. */
1800 if (h->weakdef != NULL)
1801 {
1802 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1803 || h->weakdef->root.type == bfd_link_hash_defweak);
1804 h->root.u.def.section = h->weakdef->root.u.def.section;
1805 h->root.u.def.value = h->weakdef->root.u.def.value;
1806 return true;
1807 }
1808
1809 /* This is a reference to a symbol defined by a dynamic object which
1810 is not a function. */
1811
1812 /* If we are creating a shared library, we must presume that the
1813 only references to the symbol are via the global offset table.
1814 For such cases we need not do anything here; the relocations will
1815 be handled correctly by relocate_section. */
1816 if (info->shared)
1817 return true;
1818
1819 /* We must allocate the symbol in our .dynbss section, which will
1820 become part of the .bss section of the executable. There will be
1821 an entry for this symbol in the .dynsym section. The dynamic
1822 object will contain position independent code, so all references
1823 from the dynamic object to this symbol will go through the global
1824 offset table. The dynamic linker will use the .dynsym entry to
1825 determine the address it must put in the global offset table, so
1826 both the dynamic object and the regular object will refer to the
1827 same memory location for the variable.
1828
1829 Of course, if the symbol is sufficiently small, we must instead
1830 allocate it in .sbss. FIXME: It would be better to do this if and
1831 only if there were actually SDAREL relocs for that symbol. */
1832
1833 if (h->size <= elf_gp_size (dynobj))
1834 s = bfd_get_section_by_name (dynobj, ".dynsbss");
1835 else
1836 s = bfd_get_section_by_name (dynobj, ".dynbss");
1837 BFD_ASSERT (s != NULL);
1838
1839 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
1840 copy the initial value out of the dynamic object and into the
1841 runtime process image. We need to remember the offset into the
1842 .rela.bss section we are going to use. */
1843 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1844 {
1845 asection *srel;
1846
1847 if (h->size <= elf_gp_size (dynobj))
1848 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
1849 else
1850 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1851 BFD_ASSERT (srel != NULL);
1852 srel->_raw_size += sizeof (Elf32_External_Rela);
1853 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1854 }
1855
1856 /* We need to figure out the alignment required for this symbol. I
1857 have no idea how ELF linkers handle this. */
1858 power_of_two = bfd_log2 (h->size);
1859 if (power_of_two > 4)
1860 power_of_two = 4;
1861
1862 /* Apply the required alignment. */
1863 s->_raw_size = BFD_ALIGN (s->_raw_size,
1864 (bfd_size_type) (1 << power_of_two));
1865 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1866 {
1867 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1868 return false;
1869 }
1870
1871 /* Define the symbol as being at this point in the section. */
1872 h->root.u.def.section = s;
1873 h->root.u.def.value = s->_raw_size;
1874
1875 /* Increment the section size to make room for the symbol. */
1876 s->_raw_size += h->size;
1877
1878 return true;
1879 }
1880
1881 \f
1882 /* Set the sizes of the dynamic sections. */
1883
1884 static boolean
1885 ppc_elf_size_dynamic_sections (output_bfd, info)
1886 bfd *output_bfd;
1887 struct bfd_link_info *info;
1888 {
1889 bfd *dynobj;
1890 asection *s;
1891 boolean plt;
1892 boolean relocs;
1893 boolean reltext;
1894
1895 #ifdef DEBUG
1896 fprintf (stderr, "ppc_elf_size_dynamic_sections called\n");
1897 #endif
1898
1899 dynobj = elf_hash_table (info)->dynobj;
1900 BFD_ASSERT (dynobj != NULL);
1901
1902 if (elf_hash_table (info)->dynamic_sections_created)
1903 {
1904 /* Set the contents of the .interp section to the interpreter. */
1905 if (! info->shared)
1906 {
1907 s = bfd_get_section_by_name (dynobj, ".interp");
1908 BFD_ASSERT (s != NULL);
1909 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1910 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1911 }
1912 }
1913 else
1914 {
1915 /* We may have created entries in the .rela.got, .rela.sdata, and
1916 .rela.sdata2 sections. However, if we are not creating the
1917 dynamic sections, we will not actually use these entries. Reset
1918 the size of .rela.got, et al, which will cause it to get
1919 stripped from the output file below. */
1920 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
1921 ".rela.sdata2", ".rela.sbss",
1922 (char *)0 };
1923 char **p;
1924
1925 for (p = rela_sections; *p != (char *)0; p++)
1926 {
1927 s = bfd_get_section_by_name (dynobj, *p);
1928 if (s != NULL)
1929 s->_raw_size = 0;
1930 }
1931 }
1932
1933 /* The check_relocs and adjust_dynamic_symbol entry points have
1934 determined the sizes of the various dynamic sections. Allocate
1935 memory for them. */
1936 plt = false;
1937 relocs = false;
1938 reltext = false;
1939 for (s = dynobj->sections; s != NULL; s = s->next)
1940 {
1941 const char *name;
1942 boolean strip;
1943
1944 if ((s->flags & SEC_LINKER_CREATED) == 0)
1945 continue;
1946
1947 /* It's OK to base decisions on the section name, because none
1948 of the dynobj section names depend upon the input files. */
1949 name = bfd_get_section_name (dynobj, s);
1950
1951 strip = false;
1952
1953 if (strcmp (name, ".plt") == 0)
1954 {
1955 if (s->_raw_size == 0)
1956 {
1957 /* Strip this section if we don't need it; see the
1958 comment below. */
1959 strip = true;
1960 }
1961 else
1962 {
1963 /* Remember whether there is a PLT. */
1964 plt = true;
1965 }
1966 }
1967 else if (strncmp (name, ".rela", 5) == 0)
1968 {
1969 if (s->_raw_size == 0)
1970 {
1971 /* If we don't need this section, strip it from the
1972 output file. This is mostly to handle .rela.bss and
1973 .rela.plt. We must create both sections in
1974 create_dynamic_sections, because they must be created
1975 before the linker maps input sections to output
1976 sections. The linker does that before
1977 adjust_dynamic_symbol is called, and it is that
1978 function which decides whether anything needs to go
1979 into these sections. */
1980 strip = true;
1981 }
1982 else
1983 {
1984 asection *target;
1985 const char *outname;
1986
1987 /* Remember whether there are any relocation sections. */
1988 relocs = true;
1989
1990 /* If this relocation section applies to a read only
1991 section, then we probably need a DT_TEXTREL entry. */
1992 outname = bfd_get_section_name (output_bfd,
1993 s->output_section);
1994 target = bfd_get_section_by_name (output_bfd, outname + 5);
1995 if (target != NULL
1996 && (target->flags & SEC_READONLY) != 0
1997 && (target->flags & SEC_ALLOC) != 0)
1998 reltext = true;
1999
2000 /* We use the reloc_count field as a counter if we need
2001 to copy relocs into the output file. */
2002 s->reloc_count = 0;
2003 }
2004 }
2005 else if (strcmp (name, ".got") != 0
2006 && strcmp (name, ".sdata") != 0
2007 && strcmp (name, ".sdata2") != 0)
2008 {
2009 /* It's not one of our sections, so don't allocate space. */
2010 continue;
2011 }
2012
2013 if (strip)
2014 {
2015 _bfd_strip_section_from_output (s);
2016 continue;
2017 }
2018
2019 /* Allocate memory for the section contents. */
2020 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2021 if (s->contents == NULL && s->_raw_size != 0)
2022 return false;
2023 }
2024
2025 if (elf_hash_table (info)->dynamic_sections_created)
2026 {
2027 /* Add some entries to the .dynamic section. We fill in the
2028 values later, in ppc_elf_finish_dynamic_sections, but we
2029 must add the entries now so that we get the correct size for
2030 the .dynamic section. The DT_DEBUG entry is filled in by the
2031 dynamic linker and used by the debugger. */
2032 if (! info->shared)
2033 {
2034 if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
2035 return false;
2036 }
2037
2038 if (plt)
2039 {
2040 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
2041 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
2042 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
2043 || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
2044 return false;
2045 }
2046
2047 if (relocs)
2048 {
2049 if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
2050 || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
2051 || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
2052 sizeof (Elf32_External_Rela)))
2053 return false;
2054 }
2055
2056 if (reltext)
2057 {
2058 if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
2059 return false;
2060 }
2061 }
2062
2063 return true;
2064 }
2065
2066 \f
2067 /* Look through the relocs for a section during the first phase, and
2068 allocate space in the global offset table or procedure linkage
2069 table. */
2070
2071 static boolean
2072 ppc_elf_check_relocs (abfd, info, sec, relocs)
2073 bfd *abfd;
2074 struct bfd_link_info *info;
2075 asection *sec;
2076 const Elf_Internal_Rela *relocs;
2077 {
2078 bfd *dynobj;
2079 Elf_Internal_Shdr *symtab_hdr;
2080 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2081 const Elf_Internal_Rela *rel;
2082 const Elf_Internal_Rela *rel_end;
2083 bfd_signed_vma *local_got_refcounts;
2084 elf_linker_section_t *sdata;
2085 elf_linker_section_t *sdata2;
2086 asection *sreloc;
2087 asection *sgot = NULL;
2088 asection *srelgot = NULL;
2089
2090 if (info->relocateable)
2091 return true;
2092
2093 #ifdef DEBUG
2094 fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n",
2095 bfd_get_section_name (abfd, sec),
2096 bfd_get_filename (abfd));
2097 #endif
2098
2099 /* Create the linker generated sections all the time so that the
2100 special symbols are created. */
2101
2102 if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL)
2103 {
2104 sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2105 if (!sdata)
2106 return false;
2107 }
2108
2109
2110 if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL)
2111 {
2112 sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2);
2113 if (!sdata2)
2114 return false;
2115 }
2116
2117 dynobj = elf_hash_table (info)->dynobj;
2118 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2119 local_got_refcounts = elf_local_got_refcounts (abfd);
2120
2121 sym_hashes = elf_sym_hashes (abfd);
2122 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
2123 if (!elf_bad_symtab (abfd))
2124 sym_hashes_end -= symtab_hdr->sh_info;
2125
2126 sreloc = NULL;
2127
2128 rel_end = relocs + sec->reloc_count;
2129 for (rel = relocs; rel < rel_end; rel++)
2130 {
2131 unsigned long r_symndx;
2132 struct elf_link_hash_entry *h;
2133
2134 r_symndx = ELF32_R_SYM (rel->r_info);
2135 if (r_symndx < symtab_hdr->sh_info)
2136 h = NULL;
2137 else
2138 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2139
2140 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
2141 This shows up in particular in an R_PPC_ADDR32 in the eabi
2142 startup code. */
2143 if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2144 {
2145 if (sgot == NULL)
2146 {
2147 if (dynobj == NULL)
2148 elf_hash_table (info)->dynobj = dynobj = abfd;
2149 if (! _bfd_elf_create_got_section (dynobj, info))
2150 return false;
2151 sgot = bfd_get_section_by_name (dynobj, ".got");
2152 BFD_ASSERT (sgot != NULL);
2153 }
2154 }
2155
2156 switch (ELF32_R_TYPE (rel->r_info))
2157 {
2158 /* GOT16 relocations */
2159 case R_PPC_GOT16:
2160 case R_PPC_GOT16_LO:
2161 case R_PPC_GOT16_HI:
2162 case R_PPC_GOT16_HA:
2163 /* This symbol requires a global offset table entry. */
2164
2165 if (sgot == NULL)
2166 {
2167 if (dynobj == NULL)
2168 elf_hash_table (info)->dynobj = dynobj = abfd;
2169 if (! _bfd_elf_create_got_section (dynobj, info))
2170 return false;
2171 sgot = bfd_get_section_by_name (dynobj, ".got");
2172 BFD_ASSERT (sgot != NULL);
2173 }
2174
2175 if (srelgot == NULL
2176 && (h != NULL || info->shared))
2177 {
2178 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2179 if (srelgot == NULL)
2180 {
2181 srelgot = bfd_make_section (dynobj, ".rela.got");
2182 if (srelgot == NULL
2183 || ! bfd_set_section_flags (dynobj, srelgot,
2184 (SEC_ALLOC
2185 | SEC_LOAD
2186 | SEC_HAS_CONTENTS
2187 | SEC_IN_MEMORY
2188 | SEC_LINKER_CREATED
2189 | SEC_READONLY))
2190 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2191 return false;
2192 }
2193 }
2194
2195 if (h != NULL)
2196 {
2197 if (h->got.refcount == -1)
2198 {
2199 /* Make sure this symbol is output as a dynamic symbol. */
2200 if (h->dynindx == -1)
2201 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2202 return false;
2203
2204 /* Allocate space in the .got. */
2205 sgot->_raw_size += 4;
2206 /* Allocate relocation space. */
2207 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2208
2209 h->got.refcount = 1;
2210 }
2211 else
2212 h->got.refcount++;
2213 }
2214 else
2215 {
2216 /* This is a global offset table entry for a local symbol. */
2217 if (local_got_refcounts == NULL)
2218 {
2219 size_t size;
2220
2221 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
2222 local_got_refcounts = (bfd_signed_vma *)
2223 bfd_alloc (abfd, size);
2224 if (local_got_refcounts == NULL)
2225 return false;
2226 elf_local_got_refcounts (abfd) = local_got_refcounts;
2227 memset (local_got_refcounts, -1, size);
2228 }
2229 if (local_got_refcounts[r_symndx] == -1)
2230 {
2231 sgot->_raw_size += 4;
2232
2233 /* If we are generating a shared object, we need to
2234 output a R_PPC_RELATIVE reloc so that the
2235 dynamic linker can adjust this GOT entry. */
2236 if (info->shared)
2237 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2238
2239 local_got_refcounts[r_symndx] = 1;
2240 }
2241 else
2242 local_got_refcounts[r_symndx]++;
2243 }
2244 break;
2245
2246 /* Indirect .sdata relocation */
2247 case R_PPC_EMB_SDAI16:
2248 if (info->shared)
2249 {
2250 ((*_bfd_error_handler)
2251 (_("%s: relocation %s cannot be used when making a shared object"),
2252 bfd_get_filename (abfd), "R_PPC_EMB_SDAI16"));
2253 return false;
2254 }
2255
2256 if (srelgot == NULL && (h != NULL || info->shared))
2257 {
2258 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2259 if (srelgot == NULL)
2260 {
2261 srelgot = bfd_make_section (dynobj, ".rela.got");
2262 if (srelgot == NULL
2263 || ! bfd_set_section_flags (dynobj, srelgot,
2264 (SEC_ALLOC
2265 | SEC_LOAD
2266 | SEC_HAS_CONTENTS
2267 | SEC_IN_MEMORY
2268 | SEC_LINKER_CREATED
2269 | SEC_READONLY))
2270 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2271 return false;
2272 }
2273 }
2274
2275 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel))
2276 return false;
2277
2278 break;
2279
2280 /* Indirect .sdata2 relocation */
2281 case R_PPC_EMB_SDA2I16:
2282 if (info->shared)
2283 {
2284 ((*_bfd_error_handler)
2285 (_("%s: relocation %s cannot be used when making a shared object"),
2286 bfd_get_filename (abfd), "R_PPC_EMB_SDA2I16"));
2287 return false;
2288 }
2289
2290 if (srelgot == NULL && (h != NULL || info->shared))
2291 {
2292 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2293 if (srelgot == NULL)
2294 {
2295 srelgot = bfd_make_section (dynobj, ".rela.got");
2296 if (srelgot == NULL
2297 || ! bfd_set_section_flags (dynobj, srelgot,
2298 (SEC_ALLOC
2299 | SEC_LOAD
2300 | SEC_HAS_CONTENTS
2301 | SEC_IN_MEMORY
2302 | SEC_LINKER_CREATED
2303 | SEC_READONLY))
2304 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2305 return false;
2306 }
2307 }
2308
2309 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel))
2310 return false;
2311
2312 break;
2313
2314 case R_PPC_SDAREL16:
2315 case R_PPC_EMB_SDA2REL:
2316 case R_PPC_EMB_SDA21:
2317 if (info->shared)
2318 {
2319 ((*_bfd_error_handler)
2320 (_("%s: relocation %s cannot be used when making a shared object"),
2321 bfd_get_filename (abfd),
2322 ppc_elf_howto_table[(int)ELF32_R_TYPE (rel->r_info)]->name));
2323 return false;
2324 }
2325 break;
2326
2327 case R_PPC_PLT32:
2328 case R_PPC_PLTREL24:
2329 case R_PPC_PLT16_LO:
2330 case R_PPC_PLT16_HI:
2331 case R_PPC_PLT16_HA:
2332 #ifdef DEBUG
2333 fprintf (stderr, "Reloc requires a PLT entry\n");
2334 #endif
2335 /* This symbol requires a procedure linkage table entry. We
2336 actually build the entry in adjust_dynamic_symbol,
2337 because this might be a case of linking PIC code without
2338 linking in any dynamic objects, in which case we don't
2339 need to generate a procedure linkage table after all. */
2340
2341 if (h == NULL)
2342 {
2343 /* It does not make sense to have a procedure linkage
2344 table entry for a local symbol. */
2345 bfd_set_error (bfd_error_bad_value);
2346 return false;
2347 }
2348
2349 /* Make sure this symbol is output as a dynamic symbol. */
2350 if (h->dynindx == -1)
2351 {
2352 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2353 return false;
2354 }
2355 if (h->plt.refcount == -1)
2356 {
2357 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2358 h->plt.refcount = 1;
2359 }
2360 else
2361 h->plt.refcount++;
2362 break;
2363
2364 /* The following relocations don't need to propagate the
2365 relocation if linking a shared object since they are
2366 section relative. */
2367 case R_PPC_SECTOFF:
2368 case R_PPC_SECTOFF_LO:
2369 case R_PPC_SECTOFF_HI:
2370 case R_PPC_SECTOFF_HA:
2371 break;
2372
2373 /* This refers only to functions defined in the shared library */
2374 case R_PPC_LOCAL24PC:
2375 break;
2376
2377 /* This relocation describes the C++ object vtable hierarchy.
2378 Reconstruct it for later use during GC. */
2379 case R_PPC_GNU_VTINHERIT:
2380 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2381 return false;
2382 break;
2383
2384 /* This relocation describes which C++ vtable entries are actually
2385 used. Record for later use during GC. */
2386 case R_PPC_GNU_VTENTRY:
2387 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2388 return false;
2389 break;
2390
2391 /* When creating a shared object, we must copy these
2392 relocs into the output file. We create a reloc
2393 section in dynobj and make room for the reloc. */
2394 case R_PPC_REL24:
2395 case R_PPC_REL14:
2396 case R_PPC_REL14_BRTAKEN:
2397 case R_PPC_REL14_BRNTAKEN:
2398 case R_PPC_REL32:
2399 if (h == NULL
2400 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2401 break;
2402 /* fall through */
2403
2404 default:
2405 if (info->shared)
2406 {
2407 #ifdef DEBUG
2408 fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n",
2409 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
2410 #endif
2411 if (sreloc == NULL)
2412 {
2413 const char *name;
2414
2415 name = (bfd_elf_string_from_elf_section
2416 (abfd,
2417 elf_elfheader (abfd)->e_shstrndx,
2418 elf_section_data (sec)->rel_hdr.sh_name));
2419 if (name == NULL)
2420 return false;
2421
2422 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2423 && strcmp (bfd_get_section_name (abfd, sec),
2424 name + 5) == 0);
2425
2426 sreloc = bfd_get_section_by_name (dynobj, name);
2427 if (sreloc == NULL)
2428 {
2429 flagword flags;
2430
2431 sreloc = bfd_make_section (dynobj, name);
2432 flags = (SEC_HAS_CONTENTS | SEC_READONLY
2433 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2434 if ((sec->flags & SEC_ALLOC) != 0)
2435 flags |= SEC_ALLOC | SEC_LOAD;
2436 if (sreloc == NULL
2437 || ! bfd_set_section_flags (dynobj, sreloc, flags)
2438 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
2439 return false;
2440 }
2441 }
2442
2443 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2444
2445 /* FIXME: We should here do what the m68k and i386
2446 backends do: if the reloc is pc-relative, record it
2447 in case it turns out that the reloc is unnecessary
2448 because the symbol is forced local by versioning or
2449 we are linking with -Bdynamic. Fortunately this
2450 case is not frequent. */
2451 }
2452
2453 break;
2454 }
2455 }
2456
2457 return true;
2458 }
2459
2460 /* Return the section that should be marked against GC for a given
2461 relocation. */
2462
2463 static asection *
2464 ppc_elf_gc_mark_hook (abfd, info, rel, h, sym)
2465 bfd *abfd;
2466 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2467 Elf_Internal_Rela *rel;
2468 struct elf_link_hash_entry *h;
2469 Elf_Internal_Sym *sym;
2470 {
2471 if (h != NULL)
2472 {
2473 switch (ELF32_R_TYPE (rel->r_info))
2474 {
2475 case R_PPC_GNU_VTINHERIT:
2476 case R_PPC_GNU_VTENTRY:
2477 break;
2478
2479 default:
2480 switch (h->root.type)
2481 {
2482 case bfd_link_hash_defined:
2483 case bfd_link_hash_defweak:
2484 return h->root.u.def.section;
2485
2486 case bfd_link_hash_common:
2487 return h->root.u.c.p->section;
2488
2489 default:
2490 break;
2491 }
2492 }
2493 }
2494 else
2495 {
2496 if (!(elf_bad_symtab (abfd)
2497 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
2498 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
2499 && sym->st_shndx != SHN_COMMON))
2500 {
2501 return bfd_section_from_elf_index (abfd, sym->st_shndx);
2502 }
2503 }
2504
2505 return NULL;
2506 }
2507
2508 /* Update the got entry reference counts for the section being removed. */
2509
2510 static boolean
2511 ppc_elf_gc_sweep_hook (abfd, info, sec, relocs)
2512 bfd *abfd;
2513 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2514 asection *sec;
2515 const Elf_Internal_Rela *relocs;
2516 {
2517 Elf_Internal_Shdr *symtab_hdr;
2518 struct elf_link_hash_entry **sym_hashes;
2519 bfd_signed_vma *local_got_refcounts;
2520 const Elf_Internal_Rela *rel, *relend;
2521 unsigned long r_symndx;
2522 struct elf_link_hash_entry *h;
2523
2524 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2525 sym_hashes = elf_sym_hashes (abfd);
2526 local_got_refcounts = elf_local_got_refcounts (abfd);
2527
2528 relend = relocs + sec->reloc_count;
2529 for (rel = relocs; rel < relend; rel++)
2530 switch (ELF32_R_TYPE (rel->r_info))
2531 {
2532 case R_PPC_GOT16:
2533 case R_PPC_GOT16_LO:
2534 case R_PPC_GOT16_HI:
2535 case R_PPC_GOT16_HA:
2536 r_symndx = ELF32_R_SYM (rel->r_info);
2537 if (r_symndx >= symtab_hdr->sh_info)
2538 {
2539 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2540 if (h->got.refcount > 0)
2541 h->got.refcount--;
2542 }
2543 else
2544 {
2545 if (local_got_refcounts[r_symndx] > 0)
2546 local_got_refcounts[r_symndx]--;
2547 }
2548 break;
2549
2550 case R_PPC_PLT32:
2551 case R_PPC_PLTREL24:
2552 case R_PPC_PLT16_LO:
2553 case R_PPC_PLT16_HI:
2554 case R_PPC_PLT16_HA:
2555 r_symndx = ELF32_R_SYM (rel->r_info);
2556 if (r_symndx >= symtab_hdr->sh_info)
2557 {
2558 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2559 if (h->plt.refcount > 0)
2560 h->plt.refcount--;
2561 }
2562 break;
2563
2564 default:
2565 break;
2566 }
2567
2568 return true;
2569 }
2570 \f
2571 /* Hook called by the linker routine which adds symbols from an object
2572 file. We use it to put .comm items in .sbss, and not .bss. */
2573
2574 /*ARGSUSED*/
2575 static boolean
2576 ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
2577 bfd *abfd;
2578 struct bfd_link_info *info;
2579 const Elf_Internal_Sym *sym;
2580 const char **namep ATTRIBUTE_UNUSED;
2581 flagword *flagsp ATTRIBUTE_UNUSED;
2582 asection **secp;
2583 bfd_vma *valp;
2584 {
2585 if (sym->st_shndx == SHN_COMMON
2586 && !info->relocateable
2587 && sym->st_size <= (bfd_vma) bfd_get_gp_size (abfd))
2588 {
2589 /* Common symbols less than or equal to -G nn bytes are automatically
2590 put into .sdata. */
2591 elf_linker_section_t *sdata
2592 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2593
2594 if (!sdata->bss_section)
2595 {
2596 /* We don't go through bfd_make_section, because we don't
2597 want to attach this common section to DYNOBJ. The linker
2598 will move the symbols to the appropriate output section
2599 when it defines common symbols. */
2600 sdata->bss_section = ((asection *)
2601 bfd_zalloc (abfd, sizeof (asection)));
2602 if (sdata->bss_section == NULL)
2603 return false;
2604 sdata->bss_section->name = sdata->bss_name;
2605 sdata->bss_section->flags = SEC_IS_COMMON;
2606 sdata->bss_section->output_section = sdata->bss_section;
2607 sdata->bss_section->symbol =
2608 (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
2609 sdata->bss_section->symbol_ptr_ptr =
2610 (asymbol **) bfd_zalloc (abfd, sizeof (asymbol *));
2611 if (sdata->bss_section->symbol == NULL
2612 || sdata->bss_section->symbol_ptr_ptr == NULL)
2613 return false;
2614 sdata->bss_section->symbol->name = sdata->bss_name;
2615 sdata->bss_section->symbol->flags = BSF_SECTION_SYM;
2616 sdata->bss_section->symbol->section = sdata->bss_section;
2617 *sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol;
2618 }
2619
2620 *secp = sdata->bss_section;
2621 *valp = sym->st_size;
2622 }
2623
2624 return true;
2625 }
2626
2627 \f
2628 /* Finish up dynamic symbol handling. We set the contents of various
2629 dynamic sections here. */
2630
2631 static boolean
2632 ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym)
2633 bfd *output_bfd;
2634 struct bfd_link_info *info;
2635 struct elf_link_hash_entry *h;
2636 Elf_Internal_Sym *sym;
2637 {
2638 bfd *dynobj;
2639
2640 #ifdef DEBUG
2641 fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s",
2642 h->root.root.string);
2643 #endif
2644
2645 dynobj = elf_hash_table (info)->dynobj;
2646 BFD_ASSERT (dynobj != NULL);
2647
2648 if (h->plt.offset != (bfd_vma) -1)
2649 {
2650 asection *splt;
2651 asection *srela;
2652 Elf_Internal_Rela rela;
2653 bfd_vma reloc_index;
2654
2655 #ifdef DEBUG
2656 fprintf (stderr, ", plt_offset = %d", h->plt.offset);
2657 #endif
2658
2659 /* This symbol has an entry in the procedure linkage table. Set
2660 it up. */
2661
2662 BFD_ASSERT (h->dynindx != -1);
2663
2664 splt = bfd_get_section_by_name (dynobj, ".plt");
2665 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
2666 BFD_ASSERT (splt != NULL && srela != NULL);
2667
2668 /* We don't need to fill in the .plt. The ppc dynamic linker
2669 will fill it in. */
2670
2671 /* Fill in the entry in the .rela.plt section. */
2672 rela.r_offset = (splt->output_section->vma
2673 + splt->output_offset
2674 + h->plt.offset);
2675 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT);
2676 rela.r_addend = 0;
2677
2678 reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE;
2679 if (reloc_index > PLT_NUM_SINGLE_ENTRIES)
2680 reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2;
2681 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2682 ((Elf32_External_Rela *) srela->contents
2683 + reloc_index));
2684
2685 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2686 {
2687 /* Mark the symbol as undefined, rather than as defined in
2688 the .plt section. Leave the value alone. */
2689 sym->st_shndx = SHN_UNDEF;
2690 }
2691 }
2692
2693 if (h->got.offset != (bfd_vma) -1)
2694 {
2695 asection *sgot;
2696 asection *srela;
2697 Elf_Internal_Rela rela;
2698
2699 /* This symbol has an entry in the global offset table. Set it
2700 up. */
2701
2702 sgot = bfd_get_section_by_name (dynobj, ".got");
2703 srela = bfd_get_section_by_name (dynobj, ".rela.got");
2704 BFD_ASSERT (sgot != NULL && srela != NULL);
2705
2706 rela.r_offset = (sgot->output_section->vma
2707 + sgot->output_offset
2708 + (h->got.offset &~ 1));
2709
2710 /* If this is a -Bsymbolic link, and the symbol is defined
2711 locally, we just want to emit a RELATIVE reloc. The entry in
2712 the global offset table will already have been initialized in
2713 the relocate_section function. */
2714 if (info->shared
2715 && (info->symbolic || h->dynindx == -1)
2716 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2717 {
2718 rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
2719 rela.r_addend = (h->root.u.def.value
2720 + h->root.u.def.section->output_section->vma
2721 + h->root.u.def.section->output_offset);
2722 }
2723 else
2724 {
2725 BFD_ASSERT((h->got.offset & 1) == 0);
2726 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
2727 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT);
2728 rela.r_addend = 0;
2729 }
2730
2731 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2732 ((Elf32_External_Rela *) srela->contents
2733 + srela->reloc_count));
2734 ++srela->reloc_count;
2735 }
2736
2737 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2738 {
2739 asection *s;
2740 Elf_Internal_Rela rela;
2741
2742 /* This symbols needs a copy reloc. Set it up. */
2743
2744 #ifdef DEBUG
2745 fprintf (stderr, ", copy");
2746 #endif
2747
2748 BFD_ASSERT (h->dynindx != -1);
2749
2750 if (h->size <= elf_gp_size (dynobj))
2751 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2752 ".rela.sbss");
2753 else
2754 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2755 ".rela.bss");
2756 BFD_ASSERT (s != NULL);
2757
2758 rela.r_offset = (h->root.u.def.value
2759 + h->root.u.def.section->output_section->vma
2760 + h->root.u.def.section->output_offset);
2761 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY);
2762 rela.r_addend = 0;
2763 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2764 ((Elf32_External_Rela *) s->contents
2765 + s->reloc_count));
2766 ++s->reloc_count;
2767 }
2768
2769 #ifdef DEBUG
2770 fprintf (stderr, "\n");
2771 #endif
2772
2773 /* Mark some specially defined symbols as absolute. */
2774 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2775 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2776 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2777 sym->st_shndx = SHN_ABS;
2778
2779 return true;
2780 }
2781
2782 \f
2783 /* Finish up the dynamic sections. */
2784
2785 static boolean
2786 ppc_elf_finish_dynamic_sections (output_bfd, info)
2787 bfd *output_bfd;
2788 struct bfd_link_info *info;
2789 {
2790 asection *sdyn;
2791 bfd *dynobj = elf_hash_table (info)->dynobj;
2792 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
2793
2794 #ifdef DEBUG
2795 fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n");
2796 #endif
2797
2798 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2799
2800 if (elf_hash_table (info)->dynamic_sections_created)
2801 {
2802 asection *splt;
2803 Elf32_External_Dyn *dyncon, *dynconend;
2804
2805 splt = bfd_get_section_by_name (dynobj, ".plt");
2806 BFD_ASSERT (splt != NULL && sdyn != NULL);
2807
2808 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2809 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2810 for (; dyncon < dynconend; dyncon++)
2811 {
2812 Elf_Internal_Dyn dyn;
2813 const char *name;
2814 boolean size;
2815
2816 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2817
2818 switch (dyn.d_tag)
2819 {
2820 case DT_PLTGOT: name = ".plt"; size = false; break;
2821 case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
2822 case DT_JMPREL: name = ".rela.plt"; size = false; break;
2823 default: name = NULL; size = false; break;
2824 }
2825
2826 if (name != NULL)
2827 {
2828 asection *s;
2829
2830 s = bfd_get_section_by_name (output_bfd, name);
2831 if (s == NULL)
2832 dyn.d_un.d_val = 0;
2833 else
2834 {
2835 if (! size)
2836 dyn.d_un.d_ptr = s->vma;
2837 else
2838 {
2839 if (s->_cooked_size != 0)
2840 dyn.d_un.d_val = s->_cooked_size;
2841 else
2842 dyn.d_un.d_val = s->_raw_size;
2843 }
2844 }
2845 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2846 }
2847 }
2848 }
2849
2850 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
2851 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
2852 if (sgot)
2853 {
2854 unsigned char *contents = sgot->contents;
2855 bfd_put_32 (output_bfd, 0x4e800021 /* blrl */, contents);
2856
2857 if (sdyn == NULL)
2858 bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
2859 else
2860 bfd_put_32 (output_bfd,
2861 sdyn->output_section->vma + sdyn->output_offset,
2862 contents+4);
2863
2864 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2865 }
2866
2867 return true;
2868 }
2869
2870 \f
2871 /* The RELOCATE_SECTION function is called by the ELF backend linker
2872 to handle the relocations for a section.
2873
2874 The relocs are always passed as Rela structures; if the section
2875 actually uses Rel structures, the r_addend field will always be
2876 zero.
2877
2878 This function is responsible for adjust the section contents as
2879 necessary, and (if using Rela relocs and generating a
2880 relocateable output file) adjusting the reloc addend as
2881 necessary.
2882
2883 This function does not have to worry about setting the reloc
2884 address or the reloc symbol index.
2885
2886 LOCAL_SYMS is a pointer to the swapped in local symbols.
2887
2888 LOCAL_SECTIONS is an array giving the section in the input file
2889 corresponding to the st_shndx field of each local symbol.
2890
2891 The global hash table entry for the global symbols can be found
2892 via elf_sym_hashes (input_bfd).
2893
2894 When generating relocateable output, this function must handle
2895 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
2896 going to be the section symbol corresponding to the output
2897 section, which means that the addend must be adjusted
2898 accordingly. */
2899
2900 static boolean
2901 ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
2902 contents, relocs, local_syms, local_sections)
2903 bfd *output_bfd;
2904 struct bfd_link_info *info;
2905 bfd *input_bfd;
2906 asection *input_section;
2907 bfd_byte *contents;
2908 Elf_Internal_Rela *relocs;
2909 Elf_Internal_Sym *local_syms;
2910 asection **local_sections;
2911 {
2912 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2913 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
2914 bfd *dynobj = elf_hash_table (info)->dynobj;
2915 elf_linker_section_t *sdata = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA) : NULL;
2916 elf_linker_section_t *sdata2 = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA2) : NULL;
2917 Elf_Internal_Rela *rel = relocs;
2918 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
2919 asection *sreloc = NULL;
2920 asection *splt;
2921 asection *sgot;
2922 bfd_vma *local_got_offsets;
2923 boolean ret = true;
2924 long insn;
2925
2926 #ifdef DEBUG
2927 fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n",
2928 bfd_get_filename (input_bfd),
2929 bfd_section_name(input_bfd, input_section),
2930 (long)input_section->reloc_count,
2931 (info->relocateable) ? " (relocatable)" : "");
2932 #endif
2933
2934 if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */
2935 ppc_elf_howto_init ();
2936
2937 local_got_offsets = elf_local_got_offsets (input_bfd);
2938
2939 splt = sgot = NULL;
2940 if (dynobj != NULL)
2941 {
2942 splt = bfd_get_section_by_name (dynobj, ".plt");
2943 sgot = bfd_get_section_by_name (dynobj, ".got");
2944 }
2945
2946 for (; rel < relend; rel++)
2947 {
2948 enum elf_ppc_reloc_type r_type = (enum elf_ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
2949 bfd_vma offset = rel->r_offset;
2950 bfd_vma addend = rel->r_addend;
2951 bfd_reloc_status_type r = bfd_reloc_other;
2952 Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0;
2953 asection *sec = (asection *)0;
2954 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0;
2955 const char *sym_name = (const char *)0;
2956 reloc_howto_type *howto;
2957 unsigned long r_symndx;
2958 bfd_vma relocation;
2959
2960 /* Unknown relocation handling */
2961 if ((unsigned)r_type >= (unsigned)R_PPC_max || !ppc_elf_howto_table[(int)r_type])
2962 {
2963 (*_bfd_error_handler) (_("%s: unknown relocation type %d"),
2964 bfd_get_filename (input_bfd),
2965 (int)r_type);
2966
2967 bfd_set_error (bfd_error_bad_value);
2968 ret = false;
2969 continue;
2970 }
2971
2972 howto = ppc_elf_howto_table[(int)r_type];
2973 r_symndx = ELF32_R_SYM (rel->r_info);
2974
2975 if (info->relocateable)
2976 {
2977 /* This is a relocateable link. We don't have to change
2978 anything, unless the reloc is against a section symbol,
2979 in which case we have to adjust according to where the
2980 section symbol winds up in the output section. */
2981 if (r_symndx < symtab_hdr->sh_info)
2982 {
2983 sym = local_syms + r_symndx;
2984 if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2985 {
2986 sec = local_sections[r_symndx];
2987 addend = rel->r_addend += sec->output_offset + sym->st_value;
2988 }
2989 }
2990
2991 #ifdef DEBUG
2992 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
2993 howto->name,
2994 (int)r_type,
2995 r_symndx,
2996 (long)offset,
2997 (long)addend);
2998 #endif
2999 continue;
3000 }
3001
3002 /* This is a final link. */
3003 if (r_symndx < symtab_hdr->sh_info)
3004 {
3005 sym = local_syms + r_symndx;
3006 sec = local_sections[r_symndx];
3007 sym_name = "<local symbol>";
3008
3009 relocation = (sec->output_section->vma
3010 + sec->output_offset
3011 + sym->st_value);
3012 }
3013 else
3014 {
3015 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3016 while (h->root.type == bfd_link_hash_indirect
3017 || h->root.type == bfd_link_hash_warning)
3018 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3019 sym_name = h->root.root.string;
3020 if (h->root.type == bfd_link_hash_defined
3021 || h->root.type == bfd_link_hash_defweak)
3022 {
3023 sec = h->root.u.def.section;
3024 if ((r_type == R_PPC_PLT32
3025 && h->plt.offset != (bfd_vma) -1)
3026 || (r_type == R_PPC_LOCAL24PC
3027 && sec->output_section == NULL)
3028 || ((r_type == R_PPC_GOT16
3029 || r_type == R_PPC_GOT16_LO
3030 || r_type == R_PPC_GOT16_HI
3031 || r_type == R_PPC_GOT16_HA)
3032 && elf_hash_table (info)->dynamic_sections_created
3033 && (! info->shared
3034 || (! info->symbolic && h->dynindx != -1)
3035 || (h->elf_link_hash_flags
3036 & ELF_LINK_HASH_DEF_REGULAR) == 0))
3037 || (info->shared
3038 && ((! info->symbolic && h->dynindx != -1)
3039 || (h->elf_link_hash_flags
3040 & ELF_LINK_HASH_DEF_REGULAR) == 0)
3041 && ((input_section->flags & SEC_ALLOC) != 0
3042 /* Testing SEC_DEBUGGING here may be wrong.
3043 It's here to avoid a crash when
3044 generating a shared library with DWARF
3045 debugging information. */
3046 || (input_section->flags & SEC_DEBUGGING) != 0)
3047 && (r_type == R_PPC_ADDR32
3048 || r_type == R_PPC_ADDR24
3049 || r_type == R_PPC_ADDR16
3050 || r_type == R_PPC_ADDR16_LO
3051 || r_type == R_PPC_ADDR16_HI
3052 || r_type == R_PPC_ADDR16_HA
3053 || r_type == R_PPC_ADDR14
3054 || r_type == R_PPC_ADDR14_BRTAKEN
3055 || r_type == R_PPC_ADDR14_BRNTAKEN
3056 || r_type == R_PPC_PLTREL24
3057 || r_type == R_PPC_COPY
3058 || r_type == R_PPC_GLOB_DAT
3059 || r_type == R_PPC_JMP_SLOT
3060 || r_type == R_PPC_UADDR32
3061 || r_type == R_PPC_UADDR16
3062 || r_type == R_PPC_SDAREL16
3063 || r_type == R_PPC_EMB_NADDR32
3064 || r_type == R_PPC_EMB_NADDR16
3065 || r_type == R_PPC_EMB_NADDR16_LO
3066 || r_type == R_PPC_EMB_NADDR16_HI
3067 || r_type == R_PPC_EMB_NADDR16_HA
3068 || r_type == R_PPC_EMB_SDAI16
3069 || r_type == R_PPC_EMB_SDA2I16
3070 || r_type == R_PPC_EMB_SDA2REL
3071 || r_type == R_PPC_EMB_SDA21
3072 || r_type == R_PPC_EMB_MRKREF
3073 || r_type == R_PPC_EMB_BIT_FLD
3074 || r_type == R_PPC_EMB_RELSDA
3075 || ((r_type == R_PPC_REL24
3076 || r_type == R_PPC_REL32
3077 || r_type == R_PPC_REL14
3078 || r_type == R_PPC_REL14_BRTAKEN
3079 || r_type == R_PPC_REL14_BRNTAKEN
3080 || r_type == R_PPC_RELATIVE)
3081 && strcmp (h->root.root.string,
3082 "_GLOBAL_OFFSET_TABLE_") != 0))))
3083 {
3084 /* In these cases, we don't need the relocation
3085 value. We check specially because in some
3086 obscure cases sec->output_section will be NULL. */
3087 relocation = 0;
3088 }
3089 else if (sec->output_section == NULL)
3090 {
3091 (*_bfd_error_handler)
3092 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
3093 bfd_get_filename (input_bfd), h->root.root.string,
3094 bfd_get_section_name (input_bfd, input_section));
3095 relocation = 0;
3096 }
3097 else
3098 relocation = (h->root.u.def.value
3099 + sec->output_section->vma
3100 + sec->output_offset);
3101 }
3102 else if (h->root.type == bfd_link_hash_undefweak)
3103 relocation = 0;
3104 else if (info->shared && !info->symbolic && !info->no_undefined)
3105 relocation = 0;
3106 else
3107 {
3108 if (! (*info->callbacks->undefined_symbol)(info,
3109 h->root.root.string,
3110 input_bfd,
3111 input_section,
3112 rel->r_offset))
3113 return false;
3114 relocation = 0;
3115 }
3116 }
3117
3118 switch ((int)r_type)
3119 {
3120 default:
3121 (*_bfd_error_handler) (_("%s: unknown relocation type %d for symbol %s"),
3122 bfd_get_filename (input_bfd),
3123 (int)r_type, sym_name);
3124
3125 bfd_set_error (bfd_error_bad_value);
3126 ret = false;
3127 continue;
3128
3129 /* Relocations that need no special processing. */
3130 case (int)R_PPC_LOCAL24PC:
3131 /* It makes no sense to point a local relocation
3132 at a symbol not in this object. */
3133 if (h != NULL
3134 && (h->root.type == bfd_link_hash_defined
3135 || h->root.type == bfd_link_hash_defweak)
3136 && sec->output_section == NULL)
3137 {
3138 if (! (*info->callbacks->undefined_symbol) (info,
3139 h->root.root.string,
3140 input_bfd,
3141 input_section,
3142 rel->r_offset))
3143 return false;
3144 continue;
3145 }
3146 break;
3147
3148 /* Relocations that may need to be propagated if this is a shared
3149 object. */
3150 case (int)R_PPC_REL24:
3151 case (int)R_PPC_REL32:
3152 case (int)R_PPC_REL14:
3153 /* If these relocations are not to a named symbol, they can be
3154 handled right here, no need to bother the dynamic linker. */
3155 if (h == NULL
3156 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
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_NONE:
3163 case (int)R_PPC_ADDR32:
3164 case (int)R_PPC_ADDR24:
3165 case (int)R_PPC_ADDR16:
3166 case (int)R_PPC_ADDR16_LO:
3167 case (int)R_PPC_ADDR16_HI:
3168 case (int)R_PPC_ADDR16_HA:
3169 case (int)R_PPC_ADDR14:
3170 case (int)R_PPC_UADDR32:
3171 case (int)R_PPC_UADDR16:
3172 if (info->shared)
3173 {
3174 Elf_Internal_Rela outrel;
3175 boolean skip;
3176
3177 #ifdef DEBUG
3178 fprintf (stderr, "ppc_elf_relocate_section need to create relocation for %s\n",
3179 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
3180 #endif
3181
3182 /* When generating a shared object, these relocations
3183 are copied into the output file to be resolved at run
3184 time. */
3185
3186 if (sreloc == NULL)
3187 {
3188 const char *name;
3189
3190 name = (bfd_elf_string_from_elf_section
3191 (input_bfd,
3192 elf_elfheader (input_bfd)->e_shstrndx,
3193 elf_section_data (input_section)->rel_hdr.sh_name));
3194 if (name == NULL)
3195 return false;
3196
3197 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
3198 && strcmp (bfd_get_section_name (input_bfd,
3199 input_section),
3200 name + 5) == 0);
3201
3202 sreloc = bfd_get_section_by_name (dynobj, name);
3203 BFD_ASSERT (sreloc != NULL);
3204 }
3205
3206 skip = false;
3207
3208 if (elf_section_data (input_section)->stab_info == NULL)
3209 outrel.r_offset = rel->r_offset;
3210 else
3211 {
3212 bfd_vma off;
3213
3214 off = (_bfd_stab_section_offset
3215 (output_bfd, &elf_hash_table (info)->stab_info,
3216 input_section,
3217 &elf_section_data (input_section)->stab_info,
3218 rel->r_offset));
3219 if (off == (bfd_vma) -1)
3220 skip = true;
3221 outrel.r_offset = off;
3222 }
3223
3224 outrel.r_offset += (input_section->output_section->vma
3225 + input_section->output_offset);
3226
3227 if (skip)
3228 memset (&outrel, 0, sizeof outrel);
3229 /* h->dynindx may be -1 if this symbol was marked to
3230 become local. */
3231 else if (h != NULL
3232 && ((! info->symbolic && h->dynindx != -1)
3233 || (h->elf_link_hash_flags
3234 & ELF_LINK_HASH_DEF_REGULAR) == 0))
3235 {
3236 BFD_ASSERT (h->dynindx != -1);
3237 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3238 outrel.r_addend = rel->r_addend;
3239 }
3240 else
3241 {
3242 if (r_type == R_PPC_ADDR32)
3243 {
3244 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3245 outrel.r_addend = relocation + rel->r_addend;
3246 }
3247 else
3248 {
3249 long indx;
3250
3251 if (h == NULL)
3252 sec = local_sections[r_symndx];
3253 else
3254 {
3255 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3256 || (h->root.type
3257 == bfd_link_hash_defweak));
3258 sec = h->root.u.def.section;
3259 }
3260 if (sec != NULL && bfd_is_abs_section (sec))
3261 indx = 0;
3262 else if (sec == NULL || sec->owner == NULL)
3263 {
3264 bfd_set_error (bfd_error_bad_value);
3265 return false;
3266 }
3267 else
3268 {
3269 asection *osec;
3270
3271 osec = sec->output_section;
3272 indx = elf_section_data (osec)->dynindx;
3273 BFD_ASSERT(indx > 0);
3274 #ifdef DEBUG
3275 if (indx <= 0)
3276 {
3277 printf("indx=%d section=%s flags=%08x name=%s\n",
3278 indx, osec->name, osec->flags,
3279 h->root.root.string);
3280 }
3281 #endif
3282 }
3283
3284 outrel.r_info = ELF32_R_INFO (indx, r_type);
3285 outrel.r_addend = relocation + rel->r_addend;
3286 }
3287 }
3288
3289 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
3290 (((Elf32_External_Rela *)
3291 sreloc->contents)
3292 + sreloc->reloc_count));
3293 ++sreloc->reloc_count;
3294
3295 /* This reloc will be computed at runtime, so there's no
3296 need to do anything now, unless this is a RELATIVE
3297 reloc in an unallocated section. */
3298 if (skip
3299 || (input_section->flags & SEC_ALLOC) != 0
3300 || ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE)
3301 continue;
3302 }
3303
3304 /* Arithmetic adjust relocations that aren't going into a
3305 shared object. */
3306 if (r_type == R_PPC_ADDR16_HA
3307 /* It's just possible that this symbol is a weak symbol
3308 that's not actually defined anywhere. In that case,
3309 'sec' would be NULL, and we should leave the symbol
3310 alone (it will be set to zero elsewhere in the link). */
3311 && sec != NULL)
3312 {
3313 addend += ((relocation + addend) & 0x8000) << 1;
3314 }
3315 break;
3316
3317 /* branch taken prediction relocations */
3318 case (int)R_PPC_ADDR14_BRTAKEN:
3319 case (int)R_PPC_REL14_BRTAKEN:
3320 insn = bfd_get_32 (output_bfd, contents + offset);
3321 if ((relocation - offset) & 0x8000)
3322 insn &= ~BRANCH_PREDICT_BIT;
3323 else
3324 insn |= BRANCH_PREDICT_BIT;
3325 bfd_put_32 (output_bfd, insn, contents + offset);
3326 break;
3327
3328 /* branch not taken predicition relocations */
3329 case (int)R_PPC_ADDR14_BRNTAKEN:
3330 case (int)R_PPC_REL14_BRNTAKEN:
3331 insn = bfd_get_32 (output_bfd, contents + offset);
3332 if ((relocation - offset) & 0x8000)
3333 insn |= BRANCH_PREDICT_BIT;
3334 else
3335 insn &= ~BRANCH_PREDICT_BIT;
3336 bfd_put_32 (output_bfd, insn, contents + offset);
3337 break;
3338
3339 /* GOT16 relocations */
3340 case (int)R_PPC_GOT16:
3341 case (int)R_PPC_GOT16_LO:
3342 case (int)R_PPC_GOT16_HI:
3343 case (int)R_PPC_GOT16_HA:
3344 /* Relocation is to the entry for this symbol in the global
3345 offset table. */
3346 BFD_ASSERT (sgot != NULL);
3347
3348 if (h != NULL)
3349 {
3350 bfd_vma off;
3351
3352 off = h->got.offset;
3353 BFD_ASSERT (off != (bfd_vma) -1);
3354
3355 if (! elf_hash_table (info)->dynamic_sections_created
3356 || (info->shared
3357 && (info->symbolic || h->dynindx == -1)
3358 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
3359 {
3360 /* This is actually a static link, or it is a
3361 -Bsymbolic link and the symbol is defined
3362 locally. We must initialize this entry in the
3363 global offset table. Since the offset must
3364 always be a multiple of 4, we use the least
3365 significant bit to record whether we have
3366 initialized it already.
3367
3368 When doing a dynamic link, we create a .rela.got
3369 relocation entry to initialize the value. This
3370 is done in the finish_dynamic_symbol routine. */
3371 if ((off & 1) != 0)
3372 off &= ~1;
3373 else
3374 {
3375 bfd_put_32 (output_bfd, relocation,
3376 sgot->contents + off);
3377 h->got.offset |= 1;
3378 }
3379 }
3380
3381 relocation = sgot->output_offset + off - 4;
3382 }
3383 else
3384 {
3385 bfd_vma off;
3386
3387 BFD_ASSERT (local_got_offsets != NULL
3388 && local_got_offsets[r_symndx] != (bfd_vma) -1);
3389
3390 off = local_got_offsets[r_symndx];
3391
3392 /* The offset must always be a multiple of 4. We use
3393 the least significant bit to record whether we have
3394 already processed this entry. */
3395 if ((off & 1) != 0)
3396 off &= ~1;
3397 else
3398 {
3399 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
3400
3401 if (info->shared)
3402 {
3403 asection *srelgot;
3404 Elf_Internal_Rela outrel;
3405
3406 /* We need to generate a R_PPC_RELATIVE reloc
3407 for the dynamic linker. */
3408 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
3409 BFD_ASSERT (srelgot != NULL);
3410
3411 outrel.r_offset = (sgot->output_section->vma
3412 + sgot->output_offset
3413 + off);
3414 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3415 outrel.r_addend = relocation;
3416 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
3417 (((Elf32_External_Rela *)
3418 srelgot->contents)
3419 + srelgot->reloc_count));
3420 ++srelgot->reloc_count;
3421 }
3422
3423 local_got_offsets[r_symndx] |= 1;
3424 }
3425
3426 relocation = sgot->output_offset + off - 4;
3427 }
3428 break;
3429
3430 /* Indirect .sdata relocation */
3431 case (int)R_PPC_EMB_SDAI16:
3432 BFD_ASSERT (sdata != NULL);
3433 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3434 sdata, h, relocation, rel,
3435 R_PPC_RELATIVE);
3436 break;
3437
3438 /* Indirect .sdata2 relocation */
3439 case (int)R_PPC_EMB_SDA2I16:
3440 BFD_ASSERT (sdata2 != NULL);
3441 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3442 sdata2, h, relocation, rel,
3443 R_PPC_RELATIVE);
3444 break;
3445
3446 /* Handle the TOC16 reloc. We want to use the offset within the .got
3447 section, not the actual VMA. This is appropriate when generating
3448 an embedded ELF object, for which the .got section acts like the
3449 AIX .toc section. */
3450 case (int)R_PPC_TOC16: /* phony GOT16 relocations */
3451 BFD_ASSERT (sec != (asection *)0);
3452 BFD_ASSERT (bfd_is_und_section (sec)
3453 || strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
3454 || strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0)
3455
3456 addend -= sec->output_section->vma + sec->output_offset + 0x8000;
3457 break;
3458
3459 case (int)R_PPC_PLTREL24:
3460 /* Relocation is to the entry for this symbol in the
3461 procedure linkage table. */
3462 BFD_ASSERT (h != NULL);
3463
3464 if (h->plt.offset == (bfd_vma) -1
3465 || splt == NULL)
3466 {
3467 /* We didn't make a PLT entry for this symbol. This
3468 happens when statically linking PIC code, or when
3469 using -Bsymbolic. */
3470 break;
3471 }
3472
3473 relocation = (splt->output_section->vma
3474 + splt->output_offset
3475 + h->plt.offset);
3476 break;
3477
3478 /* relocate against _SDA_BASE_ */
3479 case (int)R_PPC_SDAREL16:
3480 {
3481 const char *name;
3482
3483 BFD_ASSERT (sec != (asection *)0);
3484 name = bfd_get_section_name (abfd, sec->output_section);
3485 if (strcmp (name, ".sdata") != 0
3486 && strcmp (name, ".sbss") != 0)
3487 {
3488 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3489 bfd_get_filename (input_bfd),
3490 sym_name,
3491 ppc_elf_howto_table[ (int)r_type ]->name,
3492 name);
3493 }
3494 addend -= (sdata->sym_hash->root.u.def.value
3495 + sdata->sym_hash->root.u.def.section->output_section->vma
3496 + sdata->sym_hash->root.u.def.section->output_offset);
3497 }
3498 break;
3499
3500
3501 /* relocate against _SDA2_BASE_ */
3502 case (int)R_PPC_EMB_SDA2REL:
3503 {
3504 const char *name;
3505
3506 BFD_ASSERT (sec != (asection *)0);
3507 name = bfd_get_section_name (abfd, sec->output_section);
3508 if (strcmp (name, ".sdata2") != 0 && strcmp (name, ".sbss2") != 0)
3509 {
3510 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3511 bfd_get_filename (input_bfd),
3512 sym_name,
3513 ppc_elf_howto_table[ (int)r_type ]->name,
3514 name);
3515
3516 bfd_set_error (bfd_error_bad_value);
3517 ret = false;
3518 continue;
3519 }
3520 addend -= (sdata2->sym_hash->root.u.def.value
3521 + sdata2->sym_hash->root.u.def.section->output_section->vma
3522 + sdata2->sym_hash->root.u.def.section->output_offset);
3523 }
3524 break;
3525
3526
3527 /* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */
3528 case (int)R_PPC_EMB_SDA21:
3529 case (int)R_PPC_EMB_RELSDA:
3530 {
3531 const char *name;
3532 int reg;
3533
3534 BFD_ASSERT (sec != (asection *)0);
3535 name = bfd_get_section_name (abfd, sec->output_section);
3536 if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0)
3537 {
3538 reg = 13;
3539 addend -= (sdata->sym_hash->root.u.def.value
3540 + sdata->sym_hash->root.u.def.section->output_section->vma
3541 + sdata->sym_hash->root.u.def.section->output_offset);
3542 }
3543
3544 else if (strcmp (name, ".sdata2") == 0 || strcmp (name, ".sbss2") == 0)
3545 {
3546 reg = 2;
3547 addend -= (sdata2->sym_hash->root.u.def.value
3548 + sdata2->sym_hash->root.u.def.section->output_section->vma
3549 + sdata2->sym_hash->root.u.def.section->output_offset);
3550 }
3551
3552 else if (strcmp (name, ".PPC.EMB.sdata0") == 0 || strcmp (name, ".PPC.EMB.sbss0") == 0)
3553 {
3554 reg = 0;
3555 }
3556
3557 else
3558 {
3559 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3560 bfd_get_filename (input_bfd),
3561 sym_name,
3562 ppc_elf_howto_table[ (int)r_type ]->name,
3563 name);
3564
3565 bfd_set_error (bfd_error_bad_value);
3566 ret = false;
3567 continue;
3568 }
3569
3570 if (r_type == R_PPC_EMB_SDA21)
3571 { /* fill in register field */
3572 insn = bfd_get_32 (output_bfd, contents + offset);
3573 insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT);
3574 bfd_put_32 (output_bfd, insn, contents + offset);
3575 }
3576 }
3577 break;
3578
3579 /* Relocate against the beginning of the section */
3580 case (int)R_PPC_SECTOFF:
3581 case (int)R_PPC_SECTOFF_LO:
3582 case (int)R_PPC_SECTOFF_HI:
3583 BFD_ASSERT (sec != (asection *)0);
3584 addend -= sec->output_section->vma;
3585 break;
3586
3587 case (int)R_PPC_SECTOFF_HA:
3588 BFD_ASSERT (sec != (asection *)0);
3589 addend -= sec->output_section->vma;
3590 addend += ((relocation + addend) & 0x8000) << 1;
3591 break;
3592
3593 /* Negative relocations */
3594 case (int)R_PPC_EMB_NADDR32:
3595 case (int)R_PPC_EMB_NADDR16:
3596 case (int)R_PPC_EMB_NADDR16_LO:
3597 case (int)R_PPC_EMB_NADDR16_HI:
3598 addend -= 2*relocation;
3599 break;
3600
3601 case (int)R_PPC_EMB_NADDR16_HA:
3602 addend -= 2*relocation;
3603 addend += ((relocation + addend) & 0x8000) << 1;
3604 break;
3605
3606 /* NOP relocation that prevents garbage collecting linkers from omitting a
3607 reference. */
3608 case (int)R_PPC_EMB_MRKREF:
3609 continue;
3610
3611 case (int)R_PPC_COPY:
3612 case (int)R_PPC_GLOB_DAT:
3613 case (int)R_PPC_JMP_SLOT:
3614 case (int)R_PPC_RELATIVE:
3615 case (int)R_PPC_PLT32:
3616 case (int)R_PPC_PLTREL32:
3617 case (int)R_PPC_PLT16_LO:
3618 case (int)R_PPC_PLT16_HI:
3619 case (int)R_PPC_PLT16_HA:
3620 case (int)R_PPC_EMB_RELSEC16:
3621 case (int)R_PPC_EMB_RELST_LO:
3622 case (int)R_PPC_EMB_RELST_HI:
3623 case (int)R_PPC_EMB_RELST_HA:
3624 case (int)R_PPC_EMB_BIT_FLD:
3625 (*_bfd_error_handler) (_("%s: Relocation %s is not yet supported for symbol %s."),
3626 bfd_get_filename (input_bfd),
3627 ppc_elf_howto_table[ (int)r_type ]->name,
3628 sym_name);
3629
3630 bfd_set_error (bfd_error_invalid_operation);
3631 ret = false;
3632 continue;
3633
3634 case (int)R_PPC_GNU_VTINHERIT:
3635 case (int)R_PPC_GNU_VTENTRY:
3636 /* These are no-ops in the end. */
3637 continue;
3638 }
3639
3640
3641 #ifdef DEBUG
3642 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
3643 howto->name,
3644 (int)r_type,
3645 sym_name,
3646 r_symndx,
3647 (long)offset,
3648 (long)addend);
3649 #endif
3650
3651 r = _bfd_final_link_relocate (howto,
3652 input_bfd,
3653 input_section,
3654 contents,
3655 offset,
3656 relocation,
3657 addend);
3658
3659 if (r == bfd_reloc_ok)
3660 ;
3661 else if (r == bfd_reloc_overflow)
3662 {
3663 const char *name;
3664
3665 if (h != NULL)
3666 {
3667 if (h->root.type == bfd_link_hash_undefweak
3668 && howto->pc_relative)
3669 {
3670 /* Assume this is a call protected by other code that
3671 detect the symbol is undefined. If this is the case,
3672 we can safely ignore the overflow. If not, the
3673 program is hosed anyway, and a little warning isn't
3674 going to help. */
3675
3676 continue;
3677 }
3678
3679 name = h->root.root.string;
3680 }
3681 else
3682 {
3683 name = bfd_elf_string_from_elf_section (input_bfd,
3684 symtab_hdr->sh_link,
3685 sym->st_name);
3686 if (name == NULL)
3687 continue;
3688 if (*name == '\0')
3689 name = bfd_section_name (input_bfd, sec);
3690 }
3691
3692 if (! (*info->callbacks->reloc_overflow)(info,
3693 name,
3694 howto->name,
3695 (bfd_vma) 0,
3696 input_bfd,
3697 input_section,
3698 offset))
3699 return false;
3700 }
3701 else
3702 ret = false;
3703 }
3704
3705 #ifdef DEBUG
3706 fprintf (stderr, "\n");
3707 #endif
3708
3709 return ret;
3710 }
3711
3712 \f
3713 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
3714 #define TARGET_LITTLE_NAME "elf32-powerpcle"
3715 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
3716 #define TARGET_BIG_NAME "elf32-powerpc"
3717 #define ELF_ARCH bfd_arch_powerpc
3718 #define ELF_MACHINE_CODE EM_PPC
3719 #define ELF_MAXPAGESIZE 0x10000
3720 #define elf_info_to_howto ppc_elf_info_to_howto
3721
3722 #ifdef EM_CYGNUS_POWERPC
3723 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
3724 #endif
3725
3726 #ifdef EM_PPC_OLD
3727 #define ELF_MACHINE_ALT2 EM_PPC_OLD
3728 #endif
3729
3730 #define elf_backend_plt_not_loaded 1
3731 #define elf_backend_got_symbol_offset 4
3732 #define elf_backend_can_gc_sections 1
3733 #define elf_backend_got_header_size 12
3734 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
3735
3736 #define bfd_elf32_bfd_copy_private_bfd_data ppc_elf_copy_private_bfd_data
3737 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
3738 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
3739 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
3740 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
3741 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
3742
3743 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
3744 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
3745 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
3746 #define elf_backend_relocate_section ppc_elf_relocate_section
3747 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
3748 #define elf_backend_check_relocs ppc_elf_check_relocs
3749 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
3750 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
3751 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
3752 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
3753 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
3754 #define elf_backend_fake_sections ppc_elf_fake_sections
3755 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
3756 #define elf_backend_modify_segment_map ppc_elf_modify_segment_map
3757
3758 #include "elf32-target.h"
git-cvsimport of binutils cvsroot