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[deliverable/binutils-gdb.git] / bfd / elf32-ppc.c
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 /* This file is based on a preliminary PowerPC ELF ABI. The
23 information may not match the final PowerPC ELF ABI. It includes
24 suggestions from the in-progress Embedded PowerPC ABI, and that
25 information may also not match. */
26
27 #include "bfd.h"
28 #include "sysdep.h"
29 #include "bfdlink.h"
30 #include "libbfd.h"
31 #include "elf-bfd.h"
32 #include "elf/ppc.h"
33
34 /* RELA relocations are used here. */
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, Elf_Internal_Rela *dst));
40 static void ppc_elf_howto_init
41 PARAMS ((void));
42 static int ppc_elf_sort_rela
43 PARAMS ((const PTR, const PTR));
44 static bfd_boolean ppc_elf_relax_section
45 PARAMS ((bfd *, asection *, struct bfd_link_info *, bfd_boolean *));
46 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
47 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
48 static bfd_boolean ppc_elf_object_p
49 PARAMS ((bfd *));
50 static bfd_boolean ppc_elf_set_private_flags
51 PARAMS ((bfd *, flagword));
52 static bfd_boolean ppc_elf_merge_private_bfd_data
53 PARAMS ((bfd *, bfd *));
54 static int ppc_elf_additional_program_headers
55 PARAMS ((bfd *));
56 static bfd_boolean ppc_elf_modify_segment_map
57 PARAMS ((bfd *));
58 static asection *ppc_elf_create_got
59 PARAMS ((bfd *, struct bfd_link_info *));
60 static bfd_boolean ppc_elf_create_dynamic_sections
61 PARAMS ((bfd *, struct bfd_link_info *));
62 static bfd_boolean ppc_elf_section_from_shdr
63 PARAMS ((bfd *, Elf_Internal_Shdr *, const char *));
64 static bfd_boolean ppc_elf_fake_sections
65 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
66 static elf_linker_section_t *ppc_elf_create_linker_section
67 PARAMS ((bfd *abfd, struct bfd_link_info *info,
68 enum elf_linker_section_enum));
69 static bfd_boolean ppc_elf_check_relocs
70 PARAMS ((bfd *, struct bfd_link_info *, asection *,
71 const Elf_Internal_Rela *));
72 static asection * ppc_elf_gc_mark_hook
73 PARAMS ((asection *sec, struct bfd_link_info *info, Elf_Internal_Rela *rel,
74 struct elf_link_hash_entry *h, Elf_Internal_Sym *sym));
75 static bfd_boolean ppc_elf_gc_sweep_hook
76 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *sec,
77 const Elf_Internal_Rela *relocs));
78 static bfd_boolean ppc_elf_adjust_dynamic_symbol
79 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
80 static bfd_boolean ppc_elf_size_dynamic_sections
81 PARAMS ((bfd *, struct bfd_link_info *));
82 static bfd_boolean ppc_elf_relocate_section
83 PARAMS ((bfd *, struct bfd_link_info *info, bfd *, asection *, bfd_byte *,
84 Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms,
85 asection **));
86 static bfd_boolean ppc_elf_add_symbol_hook
87 PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *,
88 const char **, flagword *, asection **, bfd_vma *));
89 static bfd_boolean ppc_elf_finish_dynamic_symbol
90 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
91 Elf_Internal_Sym *));
92 static bfd_boolean ppc_elf_finish_dynamic_sections
93 PARAMS ((bfd *, struct bfd_link_info *));
94 static enum elf_reloc_type_class ppc_elf_reloc_type_class
95 PARAMS ((const Elf_Internal_Rela *));
96 static bfd_boolean ppc_elf_grok_prstatus
97 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
98 static bfd_boolean ppc_elf_grok_psinfo
99 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
100
101 #define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */
102 #define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */
103 #define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */
104
105 /* The name of the dynamic interpreter. This is put in the .interp
106 section. */
107
108 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
109
110 /* The size in bytes of an entry in the procedure linkage table. */
111 #define PLT_ENTRY_SIZE 12
112 /* The initial size of the plt reserved for the dynamic linker. */
113 #define PLT_INITIAL_ENTRY_SIZE 72
114 /* The size of the gap between entries in the PLT. */
115 #define PLT_SLOT_SIZE 8
116 /* The number of single-slot PLT entries (the rest use two slots). */
117 #define PLT_NUM_SINGLE_ENTRIES 8192
118
119 /* Will references to this symbol always reference the symbol
120 in this object? */
121 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
122 ((! INFO->shared \
123 || INFO->symbolic \
124 || H->dynindx == -1 \
125 || ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \
126 || ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \
127 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
128
129 /* Will _calls_ to this symbol always call the version in this object? */
130 #define SYMBOL_CALLS_LOCAL(INFO, H) \
131 ((! INFO->shared \
132 || INFO->symbolic \
133 || H->dynindx == -1 \
134 || ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \
135 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
136 \f
137 static reloc_howto_type *ppc_elf_howto_table[(int) R_PPC_max];
138
139 static reloc_howto_type ppc_elf_howto_raw[] = {
140 /* This reloc does nothing. */
141 HOWTO (R_PPC_NONE, /* type */
142 0, /* rightshift */
143 2, /* size (0 = byte, 1 = short, 2 = long) */
144 32, /* bitsize */
145 FALSE, /* pc_relative */
146 0, /* bitpos */
147 complain_overflow_bitfield, /* complain_on_overflow */
148 bfd_elf_generic_reloc, /* special_function */
149 "R_PPC_NONE", /* name */
150 FALSE, /* partial_inplace */
151 0, /* src_mask */
152 0, /* dst_mask */
153 FALSE), /* pcrel_offset */
154
155 /* A standard 32 bit relocation. */
156 HOWTO (R_PPC_ADDR32, /* type */
157 0, /* rightshift */
158 2, /* size (0 = byte, 1 = short, 2 = long) */
159 32, /* bitsize */
160 FALSE, /* pc_relative */
161 0, /* bitpos */
162 complain_overflow_bitfield, /* complain_on_overflow */
163 bfd_elf_generic_reloc, /* special_function */
164 "R_PPC_ADDR32", /* name */
165 FALSE, /* partial_inplace */
166 0, /* src_mask */
167 0xffffffff, /* dst_mask */
168 FALSE), /* pcrel_offset */
169
170 /* An absolute 26 bit branch; the lower two bits must be zero.
171 FIXME: we don't check that, we just clear them. */
172 HOWTO (R_PPC_ADDR24, /* type */
173 0, /* rightshift */
174 2, /* size (0 = byte, 1 = short, 2 = long) */
175 26, /* bitsize */
176 FALSE, /* pc_relative */
177 0, /* bitpos */
178 complain_overflow_bitfield, /* complain_on_overflow */
179 bfd_elf_generic_reloc, /* special_function */
180 "R_PPC_ADDR24", /* name */
181 FALSE, /* partial_inplace */
182 0, /* src_mask */
183 0x3fffffc, /* dst_mask */
184 FALSE), /* pcrel_offset */
185
186 /* A standard 16 bit relocation. */
187 HOWTO (R_PPC_ADDR16, /* type */
188 0, /* rightshift */
189 1, /* size (0 = byte, 1 = short, 2 = long) */
190 16, /* bitsize */
191 FALSE, /* pc_relative */
192 0, /* bitpos */
193 complain_overflow_bitfield, /* complain_on_overflow */
194 bfd_elf_generic_reloc, /* special_function */
195 "R_PPC_ADDR16", /* name */
196 FALSE, /* partial_inplace */
197 0, /* src_mask */
198 0xffff, /* dst_mask */
199 FALSE), /* pcrel_offset */
200
201 /* A 16 bit relocation without overflow. */
202 HOWTO (R_PPC_ADDR16_LO, /* type */
203 0, /* rightshift */
204 1, /* size (0 = byte, 1 = short, 2 = long) */
205 16, /* bitsize */
206 FALSE, /* pc_relative */
207 0, /* bitpos */
208 complain_overflow_dont,/* complain_on_overflow */
209 bfd_elf_generic_reloc, /* special_function */
210 "R_PPC_ADDR16_LO", /* name */
211 FALSE, /* partial_inplace */
212 0, /* src_mask */
213 0xffff, /* dst_mask */
214 FALSE), /* pcrel_offset */
215
216 /* The high order 16 bits of an address. */
217 HOWTO (R_PPC_ADDR16_HI, /* type */
218 16, /* rightshift */
219 1, /* size (0 = byte, 1 = short, 2 = long) */
220 16, /* bitsize */
221 FALSE, /* pc_relative */
222 0, /* bitpos */
223 complain_overflow_dont, /* complain_on_overflow */
224 bfd_elf_generic_reloc, /* special_function */
225 "R_PPC_ADDR16_HI", /* name */
226 FALSE, /* partial_inplace */
227 0, /* src_mask */
228 0xffff, /* dst_mask */
229 FALSE), /* pcrel_offset */
230
231 /* The high order 16 bits of an address, plus 1 if the contents of
232 the low 16 bits, treated as a signed number, is negative. */
233 HOWTO (R_PPC_ADDR16_HA, /* type */
234 16, /* rightshift */
235 1, /* size (0 = byte, 1 = short, 2 = long) */
236 16, /* bitsize */
237 FALSE, /* pc_relative */
238 0, /* bitpos */
239 complain_overflow_dont, /* complain_on_overflow */
240 ppc_elf_addr16_ha_reloc, /* special_function */
241 "R_PPC_ADDR16_HA", /* name */
242 FALSE, /* partial_inplace */
243 0, /* src_mask */
244 0xffff, /* dst_mask */
245 FALSE), /* pcrel_offset */
246
247 /* An absolute 16 bit branch; the lower two bits must be zero.
248 FIXME: we don't check that, we just clear them. */
249 HOWTO (R_PPC_ADDR14, /* type */
250 0, /* rightshift */
251 2, /* size (0 = byte, 1 = short, 2 = long) */
252 16, /* bitsize */
253 FALSE, /* pc_relative */
254 0, /* bitpos */
255 complain_overflow_bitfield, /* complain_on_overflow */
256 bfd_elf_generic_reloc, /* special_function */
257 "R_PPC_ADDR14", /* name */
258 FALSE, /* partial_inplace */
259 0, /* src_mask */
260 0xfffc, /* dst_mask */
261 FALSE), /* pcrel_offset */
262
263 /* An absolute 16 bit branch, for which bit 10 should be set to
264 indicate that the branch is expected to be taken. The lower two
265 bits must be zero. */
266 HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */
267 0, /* rightshift */
268 2, /* size (0 = byte, 1 = short, 2 = long) */
269 16, /* bitsize */
270 FALSE, /* pc_relative */
271 0, /* bitpos */
272 complain_overflow_bitfield, /* complain_on_overflow */
273 bfd_elf_generic_reloc, /* special_function */
274 "R_PPC_ADDR14_BRTAKEN",/* name */
275 FALSE, /* partial_inplace */
276 0, /* src_mask */
277 0xfffc, /* dst_mask */
278 FALSE), /* pcrel_offset */
279
280 /* An absolute 16 bit branch, for which bit 10 should be set to
281 indicate that the branch is not expected to be taken. The lower
282 two bits must be zero. */
283 HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */
284 0, /* rightshift */
285 2, /* size (0 = byte, 1 = short, 2 = long) */
286 16, /* bitsize */
287 FALSE, /* pc_relative */
288 0, /* bitpos */
289 complain_overflow_bitfield, /* complain_on_overflow */
290 bfd_elf_generic_reloc, /* special_function */
291 "R_PPC_ADDR14_BRNTAKEN",/* name */
292 FALSE, /* partial_inplace */
293 0, /* src_mask */
294 0xfffc, /* dst_mask */
295 FALSE), /* pcrel_offset */
296
297 /* A relative 26 bit branch; the lower two bits must be zero. */
298 HOWTO (R_PPC_REL24, /* type */
299 0, /* rightshift */
300 2, /* size (0 = byte, 1 = short, 2 = long) */
301 26, /* bitsize */
302 TRUE, /* pc_relative */
303 0, /* bitpos */
304 complain_overflow_signed, /* complain_on_overflow */
305 bfd_elf_generic_reloc, /* special_function */
306 "R_PPC_REL24", /* name */
307 FALSE, /* partial_inplace */
308 0, /* src_mask */
309 0x3fffffc, /* dst_mask */
310 TRUE), /* pcrel_offset */
311
312 /* A relative 16 bit branch; the lower two bits must be zero. */
313 HOWTO (R_PPC_REL14, /* type */
314 0, /* rightshift */
315 2, /* size (0 = byte, 1 = short, 2 = long) */
316 16, /* bitsize */
317 TRUE, /* pc_relative */
318 0, /* bitpos */
319 complain_overflow_signed, /* complain_on_overflow */
320 bfd_elf_generic_reloc, /* special_function */
321 "R_PPC_REL14", /* name */
322 FALSE, /* partial_inplace */
323 0, /* src_mask */
324 0xfffc, /* dst_mask */
325 TRUE), /* pcrel_offset */
326
327 /* A relative 16 bit branch. Bit 10 should be set to indicate that
328 the branch is expected to be taken. The lower two bits must be
329 zero. */
330 HOWTO (R_PPC_REL14_BRTAKEN, /* type */
331 0, /* rightshift */
332 2, /* size (0 = byte, 1 = short, 2 = long) */
333 16, /* bitsize */
334 TRUE, /* pc_relative */
335 0, /* bitpos */
336 complain_overflow_signed, /* complain_on_overflow */
337 bfd_elf_generic_reloc, /* special_function */
338 "R_PPC_REL14_BRTAKEN", /* name */
339 FALSE, /* partial_inplace */
340 0, /* src_mask */
341 0xfffc, /* dst_mask */
342 TRUE), /* pcrel_offset */
343
344 /* A relative 16 bit branch. Bit 10 should be set to indicate that
345 the branch is not expected to be taken. The lower two bits must
346 be zero. */
347 HOWTO (R_PPC_REL14_BRNTAKEN, /* type */
348 0, /* rightshift */
349 2, /* size (0 = byte, 1 = short, 2 = long) */
350 16, /* bitsize */
351 TRUE, /* pc_relative */
352 0, /* bitpos */
353 complain_overflow_signed, /* complain_on_overflow */
354 bfd_elf_generic_reloc, /* special_function */
355 "R_PPC_REL14_BRNTAKEN",/* name */
356 FALSE, /* partial_inplace */
357 0, /* src_mask */
358 0xfffc, /* dst_mask */
359 TRUE), /* pcrel_offset */
360
361 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
362 symbol. */
363 HOWTO (R_PPC_GOT16, /* type */
364 0, /* rightshift */
365 1, /* size (0 = byte, 1 = short, 2 = long) */
366 16, /* bitsize */
367 FALSE, /* pc_relative */
368 0, /* bitpos */
369 complain_overflow_signed, /* complain_on_overflow */
370 bfd_elf_generic_reloc, /* special_function */
371 "R_PPC_GOT16", /* name */
372 FALSE, /* partial_inplace */
373 0, /* src_mask */
374 0xffff, /* dst_mask */
375 FALSE), /* pcrel_offset */
376
377 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
378 the symbol. */
379 HOWTO (R_PPC_GOT16_LO, /* type */
380 0, /* rightshift */
381 1, /* size (0 = byte, 1 = short, 2 = long) */
382 16, /* bitsize */
383 FALSE, /* pc_relative */
384 0, /* bitpos */
385 complain_overflow_dont, /* complain_on_overflow */
386 bfd_elf_generic_reloc, /* special_function */
387 "R_PPC_GOT16_LO", /* name */
388 FALSE, /* partial_inplace */
389 0, /* src_mask */
390 0xffff, /* dst_mask */
391 FALSE), /* pcrel_offset */
392
393 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
394 the symbol. */
395 HOWTO (R_PPC_GOT16_HI, /* type */
396 16, /* rightshift */
397 1, /* size (0 = byte, 1 = short, 2 = long) */
398 16, /* bitsize */
399 FALSE, /* pc_relative */
400 0, /* bitpos */
401 complain_overflow_bitfield, /* complain_on_overflow */
402 bfd_elf_generic_reloc, /* special_function */
403 "R_PPC_GOT16_HI", /* name */
404 FALSE, /* partial_inplace */
405 0, /* src_mask */
406 0xffff, /* dst_mask */
407 FALSE), /* pcrel_offset */
408
409 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
410 the symbol. */
411 HOWTO (R_PPC_GOT16_HA, /* type */
412 16, /* rightshift */
413 1, /* size (0 = byte, 1 = short, 2 = long) */
414 16, /* bitsize */
415 FALSE, /* pc_relative */
416 0, /* bitpos */
417 complain_overflow_bitfield, /* complain_on_overflow */
418 ppc_elf_addr16_ha_reloc, /* special_function */
419 "R_PPC_GOT16_HA", /* name */
420 FALSE, /* partial_inplace */
421 0, /* src_mask */
422 0xffff, /* dst_mask */
423 FALSE), /* pcrel_offset */
424
425 /* Like R_PPC_REL24, but referring to the procedure linkage table
426 entry for the symbol. */
427 HOWTO (R_PPC_PLTREL24, /* type */
428 0, /* rightshift */
429 2, /* size (0 = byte, 1 = short, 2 = long) */
430 26, /* bitsize */
431 TRUE, /* pc_relative */
432 0, /* bitpos */
433 complain_overflow_signed, /* complain_on_overflow */
434 bfd_elf_generic_reloc, /* special_function */
435 "R_PPC_PLTREL24", /* name */
436 FALSE, /* partial_inplace */
437 0, /* src_mask */
438 0x3fffffc, /* dst_mask */
439 TRUE), /* pcrel_offset */
440
441 /* This is used only by the dynamic linker. The symbol should exist
442 both in the object being run and in some shared library. The
443 dynamic linker copies the data addressed by the symbol from the
444 shared library into the object, because the object being
445 run has to have the data at some particular address. */
446 HOWTO (R_PPC_COPY, /* type */
447 0, /* rightshift */
448 2, /* size (0 = byte, 1 = short, 2 = long) */
449 32, /* bitsize */
450 FALSE, /* pc_relative */
451 0, /* bitpos */
452 complain_overflow_bitfield, /* complain_on_overflow */
453 bfd_elf_generic_reloc, /* special_function */
454 "R_PPC_COPY", /* name */
455 FALSE, /* partial_inplace */
456 0, /* src_mask */
457 0, /* dst_mask */
458 FALSE), /* pcrel_offset */
459
460 /* Like R_PPC_ADDR32, but used when setting global offset table
461 entries. */
462 HOWTO (R_PPC_GLOB_DAT, /* type */
463 0, /* rightshift */
464 2, /* size (0 = byte, 1 = short, 2 = long) */
465 32, /* bitsize */
466 FALSE, /* pc_relative */
467 0, /* bitpos */
468 complain_overflow_bitfield, /* complain_on_overflow */
469 bfd_elf_generic_reloc, /* special_function */
470 "R_PPC_GLOB_DAT", /* name */
471 FALSE, /* partial_inplace */
472 0, /* src_mask */
473 0xffffffff, /* dst_mask */
474 FALSE), /* pcrel_offset */
475
476 /* Marks a procedure linkage table entry for a symbol. */
477 HOWTO (R_PPC_JMP_SLOT, /* type */
478 0, /* rightshift */
479 2, /* size (0 = byte, 1 = short, 2 = long) */
480 32, /* bitsize */
481 FALSE, /* pc_relative */
482 0, /* bitpos */
483 complain_overflow_bitfield, /* complain_on_overflow */
484 bfd_elf_generic_reloc, /* special_function */
485 "R_PPC_JMP_SLOT", /* name */
486 FALSE, /* partial_inplace */
487 0, /* src_mask */
488 0, /* dst_mask */
489 FALSE), /* pcrel_offset */
490
491 /* Used only by the dynamic linker. When the object is run, this
492 longword is set to the load address of the object, plus the
493 addend. */
494 HOWTO (R_PPC_RELATIVE, /* type */
495 0, /* rightshift */
496 2, /* size (0 = byte, 1 = short, 2 = long) */
497 32, /* bitsize */
498 FALSE, /* pc_relative */
499 0, /* bitpos */
500 complain_overflow_bitfield, /* complain_on_overflow */
501 bfd_elf_generic_reloc, /* special_function */
502 "R_PPC_RELATIVE", /* name */
503 FALSE, /* partial_inplace */
504 0, /* src_mask */
505 0xffffffff, /* dst_mask */
506 FALSE), /* pcrel_offset */
507
508 /* Like R_PPC_REL24, but uses the value of the symbol within the
509 object rather than the final value. Normally used for
510 _GLOBAL_OFFSET_TABLE_. */
511 HOWTO (R_PPC_LOCAL24PC, /* type */
512 0, /* rightshift */
513 2, /* size (0 = byte, 1 = short, 2 = long) */
514 26, /* bitsize */
515 TRUE, /* pc_relative */
516 0, /* bitpos */
517 complain_overflow_signed, /* complain_on_overflow */
518 bfd_elf_generic_reloc, /* special_function */
519 "R_PPC_LOCAL24PC", /* name */
520 FALSE, /* partial_inplace */
521 0, /* src_mask */
522 0x3fffffc, /* dst_mask */
523 TRUE), /* pcrel_offset */
524
525 /* Like R_PPC_ADDR32, but may be unaligned. */
526 HOWTO (R_PPC_UADDR32, /* type */
527 0, /* rightshift */
528 2, /* size (0 = byte, 1 = short, 2 = long) */
529 32, /* bitsize */
530 FALSE, /* pc_relative */
531 0, /* bitpos */
532 complain_overflow_bitfield, /* complain_on_overflow */
533 bfd_elf_generic_reloc, /* special_function */
534 "R_PPC_UADDR32", /* name */
535 FALSE, /* partial_inplace */
536 0, /* src_mask */
537 0xffffffff, /* dst_mask */
538 FALSE), /* pcrel_offset */
539
540 /* Like R_PPC_ADDR16, but may be unaligned. */
541 HOWTO (R_PPC_UADDR16, /* type */
542 0, /* rightshift */
543 1, /* size (0 = byte, 1 = short, 2 = long) */
544 16, /* bitsize */
545 FALSE, /* pc_relative */
546 0, /* bitpos */
547 complain_overflow_bitfield, /* complain_on_overflow */
548 bfd_elf_generic_reloc, /* special_function */
549 "R_PPC_UADDR16", /* name */
550 FALSE, /* partial_inplace */
551 0, /* src_mask */
552 0xffff, /* dst_mask */
553 FALSE), /* pcrel_offset */
554
555 /* 32-bit PC relative */
556 HOWTO (R_PPC_REL32, /* type */
557 0, /* rightshift */
558 2, /* size (0 = byte, 1 = short, 2 = long) */
559 32, /* bitsize */
560 TRUE, /* pc_relative */
561 0, /* bitpos */
562 complain_overflow_bitfield, /* complain_on_overflow */
563 bfd_elf_generic_reloc, /* special_function */
564 "R_PPC_REL32", /* name */
565 FALSE, /* partial_inplace */
566 0, /* src_mask */
567 0xffffffff, /* dst_mask */
568 TRUE), /* pcrel_offset */
569
570 /* 32-bit relocation to the symbol's procedure linkage table.
571 FIXME: not supported. */
572 HOWTO (R_PPC_PLT32, /* type */
573 0, /* rightshift */
574 2, /* size (0 = byte, 1 = short, 2 = long) */
575 32, /* bitsize */
576 FALSE, /* pc_relative */
577 0, /* bitpos */
578 complain_overflow_bitfield, /* complain_on_overflow */
579 bfd_elf_generic_reloc, /* special_function */
580 "R_PPC_PLT32", /* name */
581 FALSE, /* partial_inplace */
582 0, /* src_mask */
583 0, /* dst_mask */
584 FALSE), /* pcrel_offset */
585
586 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
587 FIXME: not supported. */
588 HOWTO (R_PPC_PLTREL32, /* type */
589 0, /* rightshift */
590 2, /* size (0 = byte, 1 = short, 2 = long) */
591 32, /* bitsize */
592 TRUE, /* pc_relative */
593 0, /* bitpos */
594 complain_overflow_bitfield, /* complain_on_overflow */
595 bfd_elf_generic_reloc, /* special_function */
596 "R_PPC_PLTREL32", /* name */
597 FALSE, /* partial_inplace */
598 0, /* src_mask */
599 0, /* dst_mask */
600 TRUE), /* pcrel_offset */
601
602 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
603 the symbol. */
604 HOWTO (R_PPC_PLT16_LO, /* type */
605 0, /* rightshift */
606 1, /* size (0 = byte, 1 = short, 2 = long) */
607 16, /* bitsize */
608 FALSE, /* pc_relative */
609 0, /* bitpos */
610 complain_overflow_dont, /* complain_on_overflow */
611 bfd_elf_generic_reloc, /* special_function */
612 "R_PPC_PLT16_LO", /* name */
613 FALSE, /* partial_inplace */
614 0, /* src_mask */
615 0xffff, /* dst_mask */
616 FALSE), /* pcrel_offset */
617
618 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
619 the symbol. */
620 HOWTO (R_PPC_PLT16_HI, /* type */
621 16, /* rightshift */
622 1, /* size (0 = byte, 1 = short, 2 = long) */
623 16, /* bitsize */
624 FALSE, /* pc_relative */
625 0, /* bitpos */
626 complain_overflow_bitfield, /* complain_on_overflow */
627 bfd_elf_generic_reloc, /* special_function */
628 "R_PPC_PLT16_HI", /* name */
629 FALSE, /* partial_inplace */
630 0, /* src_mask */
631 0xffff, /* dst_mask */
632 FALSE), /* pcrel_offset */
633
634 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
635 the symbol. */
636 HOWTO (R_PPC_PLT16_HA, /* type */
637 16, /* rightshift */
638 1, /* size (0 = byte, 1 = short, 2 = long) */
639 16, /* bitsize */
640 FALSE, /* pc_relative */
641 0, /* bitpos */
642 complain_overflow_bitfield, /* complain_on_overflow */
643 ppc_elf_addr16_ha_reloc, /* special_function */
644 "R_PPC_PLT16_HA", /* name */
645 FALSE, /* partial_inplace */
646 0, /* src_mask */
647 0xffff, /* dst_mask */
648 FALSE), /* pcrel_offset */
649
650 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
651 small data items. */
652 HOWTO (R_PPC_SDAREL16, /* type */
653 0, /* rightshift */
654 1, /* size (0 = byte, 1 = short, 2 = long) */
655 16, /* bitsize */
656 FALSE, /* pc_relative */
657 0, /* bitpos */
658 complain_overflow_signed, /* complain_on_overflow */
659 bfd_elf_generic_reloc, /* special_function */
660 "R_PPC_SDAREL16", /* name */
661 FALSE, /* partial_inplace */
662 0, /* src_mask */
663 0xffff, /* dst_mask */
664 FALSE), /* pcrel_offset */
665
666 /* 16-bit section relative relocation. */
667 HOWTO (R_PPC_SECTOFF, /* type */
668 0, /* rightshift */
669 1, /* size (0 = byte, 1 = short, 2 = long) */
670 16, /* bitsize */
671 FALSE, /* pc_relative */
672 0, /* bitpos */
673 complain_overflow_bitfield, /* complain_on_overflow */
674 bfd_elf_generic_reloc, /* special_function */
675 "R_PPC_SECTOFF", /* name */
676 FALSE, /* partial_inplace */
677 0, /* src_mask */
678 0xffff, /* dst_mask */
679 FALSE), /* pcrel_offset */
680
681 /* 16-bit lower half section relative relocation. */
682 HOWTO (R_PPC_SECTOFF_LO, /* type */
683 0, /* rightshift */
684 1, /* size (0 = byte, 1 = short, 2 = long) */
685 16, /* bitsize */
686 FALSE, /* pc_relative */
687 0, /* bitpos */
688 complain_overflow_dont, /* complain_on_overflow */
689 bfd_elf_generic_reloc, /* special_function */
690 "R_PPC_SECTOFF_LO", /* name */
691 FALSE, /* partial_inplace */
692 0, /* src_mask */
693 0xffff, /* dst_mask */
694 FALSE), /* pcrel_offset */
695
696 /* 16-bit upper half section relative relocation. */
697 HOWTO (R_PPC_SECTOFF_HI, /* type */
698 16, /* rightshift */
699 1, /* size (0 = byte, 1 = short, 2 = long) */
700 16, /* bitsize */
701 FALSE, /* pc_relative */
702 0, /* bitpos */
703 complain_overflow_bitfield, /* complain_on_overflow */
704 bfd_elf_generic_reloc, /* special_function */
705 "R_PPC_SECTOFF_HI", /* name */
706 FALSE, /* partial_inplace */
707 0, /* src_mask */
708 0xffff, /* dst_mask */
709 FALSE), /* pcrel_offset */
710
711 /* 16-bit upper half adjusted section relative relocation. */
712 HOWTO (R_PPC_SECTOFF_HA, /* type */
713 16, /* rightshift */
714 1, /* size (0 = byte, 1 = short, 2 = long) */
715 16, /* bitsize */
716 FALSE, /* pc_relative */
717 0, /* bitpos */
718 complain_overflow_bitfield, /* complain_on_overflow */
719 ppc_elf_addr16_ha_reloc, /* special_function */
720 "R_PPC_SECTOFF_HA", /* name */
721 FALSE, /* partial_inplace */
722 0, /* src_mask */
723 0xffff, /* dst_mask */
724 FALSE), /* pcrel_offset */
725
726 /* The remaining relocs are from the Embedded ELF ABI, and are not
727 in the SVR4 ELF ABI. */
728
729 /* 32 bit value resulting from the addend minus the symbol */
730 HOWTO (R_PPC_EMB_NADDR32, /* type */
731 0, /* rightshift */
732 2, /* size (0 = byte, 1 = short, 2 = long) */
733 32, /* bitsize */
734 FALSE, /* pc_relative */
735 0, /* bitpos */
736 complain_overflow_bitfield, /* complain_on_overflow */
737 bfd_elf_generic_reloc, /* special_function */
738 "R_PPC_EMB_NADDR32", /* name */
739 FALSE, /* partial_inplace */
740 0, /* src_mask */
741 0xffffffff, /* dst_mask */
742 FALSE), /* pcrel_offset */
743
744 /* 16 bit value resulting from the addend minus the symbol */
745 HOWTO (R_PPC_EMB_NADDR16, /* type */
746 0, /* rightshift */
747 1, /* size (0 = byte, 1 = short, 2 = long) */
748 16, /* bitsize */
749 FALSE, /* pc_relative */
750 0, /* bitpos */
751 complain_overflow_bitfield, /* complain_on_overflow */
752 bfd_elf_generic_reloc, /* special_function */
753 "R_PPC_EMB_NADDR16", /* name */
754 FALSE, /* partial_inplace */
755 0, /* src_mask */
756 0xffff, /* dst_mask */
757 FALSE), /* pcrel_offset */
758
759 /* 16 bit value resulting from the addend minus the symbol */
760 HOWTO (R_PPC_EMB_NADDR16_LO, /* type */
761 0, /* rightshift */
762 1, /* size (0 = byte, 1 = short, 2 = long) */
763 16, /* bitsize */
764 FALSE, /* pc_relative */
765 0, /* bitpos */
766 complain_overflow_dont,/* complain_on_overflow */
767 bfd_elf_generic_reloc, /* special_function */
768 "R_PPC_EMB_ADDR16_LO", /* name */
769 FALSE, /* partial_inplace */
770 0, /* src_mask */
771 0xffff, /* dst_mask */
772 FALSE), /* pcrel_offset */
773
774 /* The high order 16 bits of the addend minus the symbol */
775 HOWTO (R_PPC_EMB_NADDR16_HI, /* type */
776 16, /* rightshift */
777 1, /* size (0 = byte, 1 = short, 2 = long) */
778 16, /* bitsize */
779 FALSE, /* pc_relative */
780 0, /* bitpos */
781 complain_overflow_dont, /* complain_on_overflow */
782 bfd_elf_generic_reloc, /* special_function */
783 "R_PPC_EMB_NADDR16_HI", /* name */
784 FALSE, /* partial_inplace */
785 0, /* src_mask */
786 0xffff, /* dst_mask */
787 FALSE), /* pcrel_offset */
788
789 /* The high order 16 bits of the result of the addend minus the address,
790 plus 1 if the contents of the low 16 bits, treated as a signed number,
791 is negative. */
792 HOWTO (R_PPC_EMB_NADDR16_HA, /* type */
793 16, /* rightshift */
794 1, /* size (0 = byte, 1 = short, 2 = long) */
795 16, /* bitsize */
796 FALSE, /* pc_relative */
797 0, /* bitpos */
798 complain_overflow_dont, /* complain_on_overflow */
799 ppc_elf_addr16_ha_reloc, /* special_function */
800 "R_PPC_EMB_NADDR16_HA", /* name */
801 FALSE, /* partial_inplace */
802 0, /* src_mask */
803 0xffff, /* dst_mask */
804 FALSE), /* pcrel_offset */
805
806 /* 16 bit value resulting from allocating a 4 byte word to hold an
807 address in the .sdata section, and returning the offset from
808 _SDA_BASE_ for that relocation */
809 HOWTO (R_PPC_EMB_SDAI16, /* type */
810 0, /* rightshift */
811 1, /* size (0 = byte, 1 = short, 2 = long) */
812 16, /* bitsize */
813 FALSE, /* pc_relative */
814 0, /* bitpos */
815 complain_overflow_bitfield, /* complain_on_overflow */
816 bfd_elf_generic_reloc, /* special_function */
817 "R_PPC_EMB_SDAI16", /* name */
818 FALSE, /* partial_inplace */
819 0, /* src_mask */
820 0xffff, /* dst_mask */
821 FALSE), /* pcrel_offset */
822
823 /* 16 bit value resulting from allocating a 4 byte word to hold an
824 address in the .sdata2 section, and returning the offset from
825 _SDA2_BASE_ for that relocation */
826 HOWTO (R_PPC_EMB_SDA2I16, /* type */
827 0, /* rightshift */
828 1, /* size (0 = byte, 1 = short, 2 = long) */
829 16, /* bitsize */
830 FALSE, /* pc_relative */
831 0, /* bitpos */
832 complain_overflow_bitfield, /* complain_on_overflow */
833 bfd_elf_generic_reloc, /* special_function */
834 "R_PPC_EMB_SDA2I16", /* name */
835 FALSE, /* partial_inplace */
836 0, /* src_mask */
837 0xffff, /* dst_mask */
838 FALSE), /* pcrel_offset */
839
840 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
841 small data items. */
842 HOWTO (R_PPC_EMB_SDA2REL, /* type */
843 0, /* rightshift */
844 1, /* size (0 = byte, 1 = short, 2 = long) */
845 16, /* bitsize */
846 FALSE, /* pc_relative */
847 0, /* bitpos */
848 complain_overflow_signed, /* complain_on_overflow */
849 bfd_elf_generic_reloc, /* special_function */
850 "R_PPC_EMB_SDA2REL", /* name */
851 FALSE, /* partial_inplace */
852 0, /* src_mask */
853 0xffff, /* dst_mask */
854 FALSE), /* pcrel_offset */
855
856 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
857 signed offset from the appropriate base, and filling in the register
858 field with the appropriate register (0, 2, or 13). */
859 HOWTO (R_PPC_EMB_SDA21, /* type */
860 0, /* rightshift */
861 2, /* size (0 = byte, 1 = short, 2 = long) */
862 16, /* bitsize */
863 FALSE, /* pc_relative */
864 0, /* bitpos */
865 complain_overflow_signed, /* complain_on_overflow */
866 bfd_elf_generic_reloc, /* special_function */
867 "R_PPC_EMB_SDA21", /* name */
868 FALSE, /* partial_inplace */
869 0, /* src_mask */
870 0xffff, /* dst_mask */
871 FALSE), /* pcrel_offset */
872
873 /* Relocation not handled: R_PPC_EMB_MRKREF */
874 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
875 /* Relocation not handled: R_PPC_EMB_RELST_LO */
876 /* Relocation not handled: R_PPC_EMB_RELST_HI */
877 /* Relocation not handled: R_PPC_EMB_RELST_HA */
878 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
879
880 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
881 in the 16 bit signed offset from the appropriate base, and filling in the
882 register field with the appropriate register (0, 2, or 13). */
883 HOWTO (R_PPC_EMB_RELSDA, /* type */
884 0, /* rightshift */
885 1, /* size (0 = byte, 1 = short, 2 = long) */
886 16, /* bitsize */
887 TRUE, /* pc_relative */
888 0, /* bitpos */
889 complain_overflow_signed, /* complain_on_overflow */
890 bfd_elf_generic_reloc, /* special_function */
891 "R_PPC_EMB_RELSDA", /* name */
892 FALSE, /* partial_inplace */
893 0, /* src_mask */
894 0xffff, /* dst_mask */
895 FALSE), /* pcrel_offset */
896
897 /* GNU extension to record C++ vtable hierarchy */
898 HOWTO (R_PPC_GNU_VTINHERIT, /* type */
899 0, /* rightshift */
900 0, /* size (0 = byte, 1 = short, 2 = long) */
901 0, /* bitsize */
902 FALSE, /* pc_relative */
903 0, /* bitpos */
904 complain_overflow_dont, /* complain_on_overflow */
905 NULL, /* special_function */
906 "R_PPC_GNU_VTINHERIT", /* name */
907 FALSE, /* partial_inplace */
908 0, /* src_mask */
909 0, /* dst_mask */
910 FALSE), /* pcrel_offset */
911
912 /* GNU extension to record C++ vtable member usage */
913 HOWTO (R_PPC_GNU_VTENTRY, /* type */
914 0, /* rightshift */
915 0, /* size (0 = byte, 1 = short, 2 = long) */
916 0, /* bitsize */
917 FALSE, /* pc_relative */
918 0, /* bitpos */
919 complain_overflow_dont, /* complain_on_overflow */
920 NULL, /* special_function */
921 "R_PPC_GNU_VTENTRY", /* name */
922 FALSE, /* partial_inplace */
923 0, /* src_mask */
924 0, /* dst_mask */
925 FALSE), /* pcrel_offset */
926
927 /* Phony reloc to handle AIX style TOC entries */
928 HOWTO (R_PPC_TOC16, /* type */
929 0, /* rightshift */
930 1, /* size (0 = byte, 1 = short, 2 = long) */
931 16, /* bitsize */
932 FALSE, /* pc_relative */
933 0, /* bitpos */
934 complain_overflow_signed, /* complain_on_overflow */
935 bfd_elf_generic_reloc, /* special_function */
936 "R_PPC_TOC16", /* name */
937 FALSE, /* partial_inplace */
938 0, /* src_mask */
939 0xffff, /* dst_mask */
940 FALSE), /* pcrel_offset */
941 };
942 \f
943 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
944
945 static void
946 ppc_elf_howto_init ()
947 {
948 unsigned int i, type;
949
950 for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++)
951 {
952 type = ppc_elf_howto_raw[i].type;
953 BFD_ASSERT (type < sizeof (ppc_elf_howto_table) / sizeof (ppc_elf_howto_table[0]));
954 ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i];
955 }
956 }
957 \f
958 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
959
960 The MPC860, revision C0 or earlier contains a bug in the die.
961 If all of the following conditions are TRUE, the next instruction
962 to be executed *may* be treated as a no-op.
963 1/ A forward branch is executed.
964 2/ The branch is predicted as not taken.
965 3/ The branch is taken.
966 4/ The branch is located in the last 5 words of a page.
967 (The EOP limit is 5 by default but may be specified as any value from 1-10.)
968
969 Our software solution is to detect these problematic branches in a
970 linker pass and modify them as follows:
971 1/ Unconditional branches - Since these are always predicted taken,
972 there is no problem and no action is required.
973 2/ Conditional backward branches - No problem, no action required.
974 3/ Conditional forward branches - Ensure that the "inverse prediction
975 bit" is set (ensure it is predicted taken).
976 4/ Conditional register branches - Ensure that the "y bit" is set
977 (ensure it is predicted taken).
978 */
979
980 /* Sort sections by address. */
981
982 static int
983 ppc_elf_sort_rela (arg1, arg2)
984 const PTR arg1;
985 const PTR arg2;
986 {
987 const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1;
988 const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2;
989
990 /* Sort by offset. */
991 return ((*rela1)->r_offset - (*rela2)->r_offset);
992 }
993
994 static bfd_boolean
995 ppc_elf_relax_section (abfd, isec, link_info, again)
996 bfd *abfd;
997 asection *isec;
998 struct bfd_link_info *link_info;
999 bfd_boolean *again;
1000 {
1001 #define PAGESIZE 0x1000
1002
1003 bfd_byte *contents = NULL;
1004 bfd_byte *free_contents = NULL;
1005 Elf_Internal_Rela *internal_relocs = NULL;
1006 Elf_Internal_Rela *free_relocs = NULL;
1007 Elf_Internal_Rela **rela_comb = NULL;
1008 int comb_curr, comb_count;
1009
1010 /* We never have to do this more than once per input section. */
1011 *again = FALSE;
1012
1013 /* If needed, initialize this section's cooked size. */
1014 if (isec->_cooked_size == 0)
1015 isec->_cooked_size = isec->_raw_size;
1016
1017 /* We're only interested in text sections which overlap the
1018 troublesome area at the end of a page. */
1019 if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size)
1020 {
1021 bfd_vma dot, end_page, end_section;
1022 bfd_boolean section_modified;
1023
1024 /* Get the section contents. */
1025 /* Get cached copy if it exists. */
1026 if (elf_section_data (isec)->this_hdr.contents != NULL)
1027 contents = elf_section_data (isec)->this_hdr.contents;
1028 else
1029 {
1030 /* Go get them off disk. */
1031 contents = (bfd_byte *) bfd_malloc (isec->_raw_size);
1032 if (contents == NULL)
1033 goto error_return;
1034 free_contents = contents;
1035
1036 if (! bfd_get_section_contents (abfd, isec, contents,
1037 (file_ptr) 0, isec->_raw_size))
1038 goto error_return;
1039 }
1040
1041 comb_curr = 0;
1042 comb_count = 0;
1043 if (isec->reloc_count)
1044 {
1045 unsigned n;
1046 bfd_size_type amt;
1047
1048 /* Get a copy of the native relocations. */
1049 internal_relocs = _bfd_elf32_link_read_relocs (
1050 abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
1051 link_info->keep_memory);
1052 if (internal_relocs == NULL)
1053 goto error_return;
1054 if (! link_info->keep_memory)
1055 free_relocs = internal_relocs;
1056
1057 /* Setup a faster access method for the reloc info we need. */
1058 amt = isec->reloc_count;
1059 amt *= sizeof (Elf_Internal_Rela*);
1060 rela_comb = (Elf_Internal_Rela**) bfd_malloc (amt);
1061 if (rela_comb == NULL)
1062 goto error_return;
1063 for (n = 0; n < isec->reloc_count; ++n)
1064 {
1065 long r_type;
1066
1067 r_type = ELF32_R_TYPE (internal_relocs[n].r_info);
1068 if (r_type < 0 || r_type >= (int) R_PPC_max)
1069 goto error_return;
1070
1071 /* Prologue constants are sometimes present in the ".text"
1072 sections and they can be identified by their associated relocation.
1073 We don't want to process those words and some others which
1074 can also be identified by their relocations. However, not all
1075 conditional branches will have a relocation so we will
1076 only ignore words that 1) have a reloc, and 2) the reloc
1077 is not applicable to a conditional branch.
1078 The array rela_comb is built here for use in the EOP scan loop. */
1079 switch (r_type)
1080 {
1081 case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */
1082 case R_PPC_REL14: /* relative cond. br. */
1083 case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */
1084 /* We should check the instruction. */
1085 break;
1086 default:
1087 /* The word is not a conditional branch - ignore it. */
1088 rela_comb[comb_count++] = &internal_relocs[n];
1089 break;
1090 }
1091 }
1092 if (comb_count > 1)
1093 qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela);
1094 }
1095
1096 /* Enumerate each EOP region that overlaps this section. */
1097 end_section = isec->vma + isec->_cooked_size;
1098 dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1;
1099 dot -= link_info->mpc860c0;
1100 section_modified = FALSE;
1101 if (dot < isec->vma) /* Increment the start position if this section */
1102 dot = isec->vma; /* begins in the middle of its first EOP region. */
1103 for (;
1104 dot < end_section;
1105 dot += PAGESIZE, end_page += PAGESIZE)
1106 {
1107
1108 /* Check each word in this EOP region. */
1109 for (; dot < end_page; dot += 4)
1110 {
1111 bfd_vma isec_offset;
1112 unsigned long insn;
1113 bfd_boolean skip, modified;
1114
1115 /* Don't process this word if there is a relocation for it and
1116 the relocation indicates the word is not a conditional branch. */
1117 skip = FALSE;
1118 isec_offset = dot - isec->vma;
1119 for (; comb_curr<comb_count; ++comb_curr)
1120 {
1121 bfd_vma r_offset;
1122
1123 r_offset = rela_comb[comb_curr]->r_offset;
1124 if (r_offset >= isec_offset)
1125 {
1126 if (r_offset == isec_offset) skip = TRUE;
1127 break;
1128 }
1129 }
1130 if (skip) continue;
1131
1132 /* Check the current word for a problematic conditional branch. */
1133 #define BO0(insn) ((insn) & 0x02000000)
1134 #define BO2(insn) ((insn) & 0x00800000)
1135 #define BO4(insn) ((insn) & 0x00200000)
1136 insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset);
1137 modified = FALSE;
1138 if ((insn & 0xFc000000) == 0x40000000)
1139 {
1140 /* Instruction is BCx */
1141 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1142 {
1143 bfd_vma target;
1144 /* This branch is predicted as "normal".
1145 If this is a forward branch, it is problematic. */
1146
1147 target = insn & 0x0000Fffc; /*extract*/
1148 target = (target ^ 0x8000) - 0x8000; /*sign extend*/
1149 if ((insn & 0x00000002) == 0)
1150 target += dot; /*convert to abs*/
1151 if (target > dot)
1152 {
1153 insn |= 0x00200000; /* set the prediction bit */
1154 modified = TRUE;
1155 }
1156 }
1157 }
1158 else if ((insn & 0xFc00Fffe) == 0x4c000420)
1159 {
1160 /* Instruction is BCCTRx */
1161 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1162 {
1163 /* This branch is predicted as not-taken.
1164 If this is a forward branch, it is problematic.
1165 Since we can't tell statically if it will branch forward,
1166 always set the prediction bit. */
1167 insn |= 0x00200000; /* set the prediction bit */
1168 modified = TRUE;
1169 }
1170 }
1171 else if ((insn & 0xFc00Fffe) == 0x4c000020)
1172 {
1173 /* Instruction is BCLRx */
1174 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
1175 {
1176 /* This branch is predicted as not-taken.
1177 If this is a forward branch, it is problematic.
1178 Since we can't tell statically if it will branch forward,
1179 always set the prediction bit. */
1180 insn |= 0x00200000; /* set the prediction bit */
1181 modified = TRUE;
1182 }
1183 }
1184 #undef BO0
1185 #undef BO2
1186 #undef BO4
1187 if (modified)
1188 {
1189 bfd_put_32 (abfd, (bfd_vma) insn, contents + isec_offset);
1190 section_modified = TRUE;
1191 }
1192 }
1193 }
1194 if (section_modified)
1195 {
1196 elf_section_data (isec)->this_hdr.contents = contents;
1197 free_contents = NULL;
1198 }
1199 }
1200
1201 if (rela_comb != NULL)
1202 {
1203 free (rela_comb);
1204 rela_comb = NULL;
1205 }
1206
1207 if (free_relocs != NULL)
1208 {
1209 free (free_relocs);
1210 free_relocs = NULL;
1211 }
1212
1213 if (free_contents != NULL)
1214 {
1215 if (! link_info->keep_memory)
1216 free (free_contents);
1217 else
1218 {
1219 /* Cache the section contents for elf_link_input_bfd. */
1220 elf_section_data (isec)->this_hdr.contents = contents;
1221 }
1222 free_contents = NULL;
1223 }
1224
1225 return TRUE;
1226
1227 error_return:
1228 if (rela_comb != NULL)
1229 free (rela_comb);
1230 if (free_relocs != NULL)
1231 free (free_relocs);
1232 if (free_contents != NULL)
1233 free (free_contents);
1234 return FALSE;
1235 }
1236 \f
1237 static reloc_howto_type *
1238 ppc_elf_reloc_type_lookup (abfd, code)
1239 bfd *abfd ATTRIBUTE_UNUSED;
1240 bfd_reloc_code_real_type code;
1241 {
1242 enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE;
1243
1244 if (!ppc_elf_howto_table[R_PPC_ADDR32])
1245 /* Initialize howto table if needed. */
1246 ppc_elf_howto_init ();
1247
1248 switch ((int) code)
1249 {
1250 default:
1251 return (reloc_howto_type *) NULL;
1252
1253 case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break;
1254 case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break;
1255 case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break;
1256 case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break;
1257 case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break;
1258 case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break;
1259 case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break;
1260 case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break;
1261 case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break;
1262 case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break;
1263 case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break;
1264 case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break;
1265 case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break;
1266 case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break;
1267 case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break;
1268 case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break;
1269 case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break;
1270 case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break;
1271 case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break;
1272 case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break;
1273 case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break;
1274 case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break;
1275 case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break;
1276 case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break;
1277 case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break;
1278 case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break;
1279 case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break;
1280 case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break;
1281 case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break;
1282 case BFD_RELOC_16_BASEREL: ppc_reloc = R_PPC_SECTOFF; break;
1283 case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break;
1284 case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break;
1285 case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break;
1286 case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break;
1287 case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break;
1288 case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break;
1289 case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break;
1290 case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break;
1291 case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break;
1292 case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break;
1293 case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break;
1294 case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break;
1295 case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break;
1296 case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break;
1297 case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break;
1298 case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break;
1299 case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break;
1300 case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break;
1301 case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break;
1302 case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break;
1303 case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break;
1304 case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break;
1305 case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; break;
1306 }
1307
1308 return ppc_elf_howto_table[(int) ppc_reloc];
1309 };
1310
1311 /* Set the howto pointer for a PowerPC ELF reloc. */
1312
1313 static void
1314 ppc_elf_info_to_howto (abfd, cache_ptr, dst)
1315 bfd *abfd ATTRIBUTE_UNUSED;
1316 arelent *cache_ptr;
1317 Elf_Internal_Rela *dst;
1318 {
1319 if (!ppc_elf_howto_table[R_PPC_ADDR32])
1320 /* Initialize howto table if needed. */
1321 ppc_elf_howto_init ();
1322
1323 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max);
1324 cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
1325 }
1326
1327 /* Handle the R_PPC_ADDR16_HA reloc. */
1328
1329 static bfd_reloc_status_type
1330 ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section,
1331 output_bfd, error_message)
1332 bfd *abfd ATTRIBUTE_UNUSED;
1333 arelent *reloc_entry;
1334 asymbol *symbol;
1335 PTR data ATTRIBUTE_UNUSED;
1336 asection *input_section;
1337 bfd *output_bfd;
1338 char **error_message ATTRIBUTE_UNUSED;
1339 {
1340 bfd_vma relocation;
1341
1342 if (output_bfd != NULL)
1343 {
1344 reloc_entry->address += input_section->output_offset;
1345 return bfd_reloc_ok;
1346 }
1347
1348 if (reloc_entry->address > input_section->_cooked_size)
1349 return bfd_reloc_outofrange;
1350
1351 if (bfd_is_com_section (symbol->section))
1352 relocation = 0;
1353 else
1354 relocation = symbol->value;
1355
1356 relocation += symbol->section->output_section->vma;
1357 relocation += symbol->section->output_offset;
1358 relocation += reloc_entry->addend;
1359
1360 reloc_entry->addend += (relocation & 0x8000) << 1;
1361
1362 return bfd_reloc_continue;
1363 }
1364
1365 /* Fix bad default arch selected for a 32 bit input bfd when the
1366 default is 64 bit. */
1367
1368 static bfd_boolean
1369 ppc_elf_object_p (abfd)
1370 bfd *abfd;
1371 {
1372 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 64)
1373 {
1374 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd);
1375
1376 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS32)
1377 {
1378 /* Relies on arch after 64 bit default being 32 bit default. */
1379 abfd->arch_info = abfd->arch_info->next;
1380 BFD_ASSERT (abfd->arch_info->bits_per_word == 32);
1381 }
1382 }
1383 return TRUE;
1384 }
1385
1386 /* Function to set whether a module needs the -mrelocatable bit set. */
1387
1388 static bfd_boolean
1389 ppc_elf_set_private_flags (abfd, flags)
1390 bfd *abfd;
1391 flagword flags;
1392 {
1393 BFD_ASSERT (!elf_flags_init (abfd)
1394 || elf_elfheader (abfd)->e_flags == flags);
1395
1396 elf_elfheader (abfd)->e_flags = flags;
1397 elf_flags_init (abfd) = TRUE;
1398 return TRUE;
1399 }
1400
1401 /* Merge backend specific data from an object file to the output
1402 object file when linking */
1403 static bfd_boolean
1404 ppc_elf_merge_private_bfd_data (ibfd, obfd)
1405 bfd *ibfd;
1406 bfd *obfd;
1407 {
1408 flagword old_flags;
1409 flagword new_flags;
1410 bfd_boolean error;
1411
1412 /* Check if we have the same endianess */
1413 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
1414 return FALSE;
1415
1416 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1417 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1418 return TRUE;
1419
1420 new_flags = elf_elfheader (ibfd)->e_flags;
1421 old_flags = elf_elfheader (obfd)->e_flags;
1422 if (!elf_flags_init (obfd)) /* First call, no flags set */
1423 {
1424 elf_flags_init (obfd) = TRUE;
1425 elf_elfheader (obfd)->e_flags = new_flags;
1426 }
1427
1428 else if (new_flags == old_flags) /* Compatible flags are ok */
1429 ;
1430
1431 else /* Incompatible flags */
1432 {
1433 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked
1434 with either. */
1435 error = FALSE;
1436 if ((new_flags & EF_PPC_RELOCATABLE) != 0
1437 && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0)
1438 {
1439 error = TRUE;
1440 (*_bfd_error_handler)
1441 (_("%s: compiled with -mrelocatable and linked with modules compiled normally"),
1442 bfd_archive_filename (ibfd));
1443 }
1444 else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
1445 && (old_flags & EF_PPC_RELOCATABLE) != 0)
1446 {
1447 error = TRUE;
1448 (*_bfd_error_handler)
1449 (_("%s: compiled normally and linked with modules compiled with -mrelocatable"),
1450 bfd_archive_filename (ibfd));
1451 }
1452
1453 /* The output is -mrelocatable-lib iff both the input files are. */
1454 if (! (new_flags & EF_PPC_RELOCATABLE_LIB))
1455 elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB;
1456
1457 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
1458 but each input file is either -mrelocatable or -mrelocatable-lib. */
1459 if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB)
1460 && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))
1461 && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)))
1462 elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE;
1463
1464 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */
1465 elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB);
1466
1467 new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1468 old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
1469
1470 /* Warn about any other mismatches */
1471 if (new_flags != old_flags)
1472 {
1473 error = TRUE;
1474 (*_bfd_error_handler)
1475 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
1476 bfd_archive_filename (ibfd), (long) new_flags, (long) old_flags);
1477 }
1478
1479 if (error)
1480 {
1481 bfd_set_error (bfd_error_bad_value);
1482 return FALSE;
1483 }
1484 }
1485
1486 return TRUE;
1487 }
1488 \f
1489 /* Handle a PowerPC specific section when reading an object file. This
1490 is called when elfcode.h finds a section with an unknown type. */
1491
1492 static bfd_boolean
1493 ppc_elf_section_from_shdr (abfd, hdr, name)
1494 bfd *abfd;
1495 Elf_Internal_Shdr *hdr;
1496 const char *name;
1497 {
1498 asection *newsect;
1499 flagword flags;
1500
1501 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
1502 return FALSE;
1503
1504 newsect = hdr->bfd_section;
1505 flags = bfd_get_section_flags (abfd, newsect);
1506 if (hdr->sh_flags & SHF_EXCLUDE)
1507 flags |= SEC_EXCLUDE;
1508
1509 if (hdr->sh_type == SHT_ORDERED)
1510 flags |= SEC_SORT_ENTRIES;
1511
1512 bfd_set_section_flags (abfd, newsect, flags);
1513 return TRUE;
1514 }
1515 \f
1516 /* Set up any other section flags and such that may be necessary. */
1517
1518 static bfd_boolean
1519 ppc_elf_fake_sections (abfd, shdr, asect)
1520 bfd *abfd ATTRIBUTE_UNUSED;
1521 Elf_Internal_Shdr *shdr;
1522 asection *asect;
1523 {
1524 if ((asect->flags & SEC_EXCLUDE) != 0)
1525 shdr->sh_flags |= SHF_EXCLUDE;
1526
1527 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
1528 shdr->sh_type = SHT_ORDERED;
1529
1530 return TRUE;
1531 }
1532 \f
1533 /* Create a special linker section */
1534 static elf_linker_section_t *
1535 ppc_elf_create_linker_section (abfd, info, which)
1536 bfd *abfd;
1537 struct bfd_link_info *info;
1538 enum elf_linker_section_enum which;
1539 {
1540 bfd *dynobj = elf_hash_table (info)->dynobj;
1541 elf_linker_section_t *lsect;
1542
1543 /* Record the first bfd section that needs the special section */
1544 if (!dynobj)
1545 dynobj = elf_hash_table (info)->dynobj = abfd;
1546
1547 /* If this is the first time, create the section */
1548 lsect = elf_linker_section (dynobj, which);
1549 if (!lsect)
1550 {
1551 elf_linker_section_t defaults;
1552 static elf_linker_section_t zero_section;
1553
1554 defaults = zero_section;
1555 defaults.which = which;
1556 defaults.hole_written_p = FALSE;
1557 defaults.alignment = 2;
1558
1559 /* Both of these sections are (technically) created by the user
1560 putting data in them, so they shouldn't be marked
1561 SEC_LINKER_CREATED.
1562
1563 The linker creates them so it has somewhere to attach their
1564 respective symbols. In fact, if they were empty it would
1565 be OK to leave the symbol set to 0 (or any random number), because
1566 the appropriate register should never be used. */
1567 defaults.flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1568 | SEC_IN_MEMORY);
1569
1570 switch (which)
1571 {
1572 default:
1573 (*_bfd_error_handler) (_("%s: Unknown special linker type %d"),
1574 bfd_get_filename (abfd),
1575 (int) which);
1576
1577 bfd_set_error (bfd_error_bad_value);
1578 return (elf_linker_section_t *) 0;
1579
1580 case LINKER_SECTION_SDATA: /* .sdata/.sbss section */
1581 defaults.name = ".sdata";
1582 defaults.rel_name = ".rela.sdata";
1583 defaults.bss_name = ".sbss";
1584 defaults.sym_name = "_SDA_BASE_";
1585 defaults.sym_offset = 32768;
1586 break;
1587
1588 case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */
1589 defaults.name = ".sdata2";
1590 defaults.rel_name = ".rela.sdata2";
1591 defaults.bss_name = ".sbss2";
1592 defaults.sym_name = "_SDA2_BASE_";
1593 defaults.sym_offset = 32768;
1594 defaults.flags |= SEC_READONLY;
1595 break;
1596 }
1597
1598 lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults);
1599 }
1600
1601 return lsect;
1602 }
1603 \f
1604 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we
1605 need to bump up the number of section headers. */
1606
1607 static int
1608 ppc_elf_additional_program_headers (abfd)
1609 bfd *abfd;
1610 {
1611 asection *s;
1612 int ret;
1613
1614 ret = 0;
1615
1616 s = bfd_get_section_by_name (abfd, ".interp");
1617 if (s != NULL)
1618 ++ret;
1619
1620 s = bfd_get_section_by_name (abfd, ".sbss2");
1621 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1622 ++ret;
1623
1624 s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0");
1625 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
1626 ++ret;
1627
1628 return ret;
1629 }
1630
1631 /* Modify the segment map if needed. */
1632
1633 static bfd_boolean
1634 ppc_elf_modify_segment_map (abfd)
1635 bfd *abfd ATTRIBUTE_UNUSED;
1636 {
1637 return TRUE;
1638 }
1639 \f
1640 /* The powerpc .got has a blrl instruction in it. Mark it executable. */
1641
1642 static asection *
1643 ppc_elf_create_got (abfd, info)
1644 bfd *abfd;
1645 struct bfd_link_info *info;
1646 {
1647 register asection *s;
1648 flagword flags;
1649
1650 if (!_bfd_elf_create_got_section (abfd, info))
1651 return NULL;
1652
1653 s = bfd_get_section_by_name (abfd, ".got");
1654 if (s == NULL)
1655 abort ();
1656
1657 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1658 | SEC_LINKER_CREATED);
1659 if (!bfd_set_section_flags (abfd, s, flags))
1660 return NULL;
1661 return s;
1662 }
1663
1664 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
1665 to output sections (just like _bfd_elf_create_dynamic_sections has
1666 to create .dynbss and .rela.bss). */
1667
1668 static bfd_boolean
1669 ppc_elf_create_dynamic_sections (abfd, info)
1670 bfd *abfd;
1671 struct bfd_link_info *info;
1672 {
1673 register asection *s;
1674 flagword flags;
1675
1676 if (!ppc_elf_create_got (abfd, info))
1677 return FALSE;
1678
1679 if (!_bfd_elf_create_dynamic_sections (abfd, info))
1680 return FALSE;
1681
1682 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1683 | SEC_LINKER_CREATED);
1684
1685 s = bfd_make_section (abfd, ".dynsbss");
1686 if (s == NULL
1687 || ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
1688 return FALSE;
1689
1690 if (! info->shared)
1691 {
1692 s = bfd_make_section (abfd, ".rela.sbss");
1693 if (s == NULL
1694 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1695 || ! bfd_set_section_alignment (abfd, s, 2))
1696 return FALSE;
1697 }
1698
1699 s = bfd_get_section_by_name (abfd, ".plt");
1700 if (s == NULL)
1701 abort ();
1702
1703 flags = SEC_ALLOC | SEC_CODE | SEC_IN_MEMORY | SEC_LINKER_CREATED;
1704 return bfd_set_section_flags (abfd, s, flags);
1705 }
1706
1707 /* Adjust a symbol defined by a dynamic object and referenced by a
1708 regular object. The current definition is in some section of the
1709 dynamic object, but we're not including those sections. We have to
1710 change the definition to something the rest of the link can
1711 understand. */
1712
1713 static bfd_boolean
1714 ppc_elf_adjust_dynamic_symbol (info, h)
1715 struct bfd_link_info *info;
1716 struct elf_link_hash_entry *h;
1717 {
1718 bfd *dynobj = elf_hash_table (info)->dynobj;
1719 asection *s;
1720 unsigned int power_of_two;
1721 bfd_vma plt_offset;
1722
1723 #ifdef DEBUG
1724 fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string);
1725 #endif
1726
1727 /* Make sure we know what is going on here. */
1728 BFD_ASSERT (dynobj != NULL
1729 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
1730 || h->weakdef != NULL
1731 || ((h->elf_link_hash_flags
1732 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1733 && (h->elf_link_hash_flags
1734 & ELF_LINK_HASH_REF_REGULAR) != 0
1735 && (h->elf_link_hash_flags
1736 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
1737
1738 /* If this is a function, put it in the procedure linkage table. We
1739 will fill in the contents of the procedure linkage table later,
1740 when we know the address of the .got section. */
1741 if (h->type == STT_FUNC
1742 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1743 {
1744 if (! elf_hash_table (info)->dynamic_sections_created
1745 || SYMBOL_CALLS_LOCAL (info, h)
1746 || (info->shared && h->plt.refcount <= 0))
1747 {
1748 /* A PLT entry is not required/allowed when:
1749
1750 1. We are not using ld.so; because then the PLT entry
1751 can't be set up, so we can't use one.
1752
1753 2. We know for certain that a call to this symbol
1754 will go to this object.
1755
1756 3. GC has rendered the entry unused.
1757 Note, however, that in an executable all references to the
1758 symbol go to the PLT, so we can't turn it off in that case.
1759 ??? The correct thing to do here is to reference count
1760 all uses of the symbol, not just those to the GOT or PLT. */
1761 h->plt.offset = (bfd_vma) -1;
1762 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1763 return TRUE;
1764 }
1765
1766 /* Make sure this symbol is output as a dynamic symbol. */
1767 if (h->dynindx == -1)
1768 {
1769 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1770 return FALSE;
1771 }
1772 BFD_ASSERT (h->dynindx != -1);
1773
1774 s = bfd_get_section_by_name (dynobj, ".plt");
1775 BFD_ASSERT (s != NULL);
1776
1777 /* If this is the first .plt entry, make room for the special
1778 first entry. */
1779 if (s->_raw_size == 0)
1780 s->_raw_size += PLT_INITIAL_ENTRY_SIZE;
1781
1782 /* The PowerPC PLT is actually composed of two parts, the first part
1783 is 2 words (for a load and a jump), and then there is a remaining
1784 word available at the end. */
1785 plt_offset = (PLT_INITIAL_ENTRY_SIZE
1786 + (PLT_SLOT_SIZE
1787 * ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE)
1788 / PLT_ENTRY_SIZE)));
1789
1790 /* If this symbol is not defined in a regular file, and we are
1791 not generating a shared library, then set the symbol to this
1792 location in the .plt. This is required to make function
1793 pointers compare as equal between the normal executable and
1794 the shared library. */
1795 if (! info->shared
1796 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1797 {
1798 h->root.u.def.section = s;
1799 h->root.u.def.value = plt_offset;
1800 }
1801
1802 h->plt.offset = plt_offset;
1803
1804 /* Make room for this entry. After the 8192nd entry, room
1805 for two entries is allocated. */
1806 if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
1807 >= PLT_NUM_SINGLE_ENTRIES)
1808 s->_raw_size += 2 * PLT_ENTRY_SIZE;
1809 else
1810 s->_raw_size += PLT_ENTRY_SIZE;
1811
1812 /* We also need to make an entry in the .rela.plt section. */
1813 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1814 BFD_ASSERT (s != NULL);
1815 s->_raw_size += sizeof (Elf32_External_Rela);
1816
1817 return TRUE;
1818 }
1819 else
1820 h->plt.offset = (bfd_vma) -1;
1821
1822 /* If this is a weak symbol, and there is a real definition, the
1823 processor independent code will have arranged for us to see the
1824 real definition first, and we can just use the same value. */
1825 if (h->weakdef != NULL)
1826 {
1827 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1828 || h->weakdef->root.type == bfd_link_hash_defweak);
1829 h->root.u.def.section = h->weakdef->root.u.def.section;
1830 h->root.u.def.value = h->weakdef->root.u.def.value;
1831 return TRUE;
1832 }
1833
1834 /* This is a reference to a symbol defined by a dynamic object which
1835 is not a function. */
1836
1837 /* If we are creating a shared library, we must presume that the
1838 only references to the symbol are via the global offset table.
1839 For such cases we need not do anything here; the relocations will
1840 be handled correctly by relocate_section. */
1841 if (info->shared)
1842 return TRUE;
1843
1844 /* We must allocate the symbol in our .dynbss section, which will
1845 become part of the .bss section of the executable. There will be
1846 an entry for this symbol in the .dynsym section. The dynamic
1847 object will contain position independent code, so all references
1848 from the dynamic object to this symbol will go through the global
1849 offset table. The dynamic linker will use the .dynsym entry to
1850 determine the address it must put in the global offset table, so
1851 both the dynamic object and the regular object will refer to the
1852 same memory location for the variable.
1853
1854 Of course, if the symbol is sufficiently small, we must instead
1855 allocate it in .sbss. FIXME: It would be better to do this if and
1856 only if there were actually SDAREL relocs for that symbol. */
1857
1858 if (h->size <= elf_gp_size (dynobj))
1859 s = bfd_get_section_by_name (dynobj, ".dynsbss");
1860 else
1861 s = bfd_get_section_by_name (dynobj, ".dynbss");
1862 BFD_ASSERT (s != NULL);
1863
1864 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
1865 copy the initial value out of the dynamic object and into the
1866 runtime process image. We need to remember the offset into the
1867 .rela.bss section we are going to use. */
1868 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1869 {
1870 asection *srel;
1871
1872 if (h->size <= elf_gp_size (dynobj))
1873 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
1874 else
1875 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1876 BFD_ASSERT (srel != NULL);
1877 srel->_raw_size += sizeof (Elf32_External_Rela);
1878 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1879 }
1880
1881 /* We need to figure out the alignment required for this symbol. I
1882 have no idea how ELF linkers handle this. */
1883 power_of_two = bfd_log2 (h->size);
1884 if (power_of_two > 4)
1885 power_of_two = 4;
1886
1887 /* Apply the required alignment. */
1888 s->_raw_size = BFD_ALIGN (s->_raw_size,
1889 (bfd_size_type) (1 << power_of_two));
1890 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1891 {
1892 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1893 return FALSE;
1894 }
1895
1896 /* Define the symbol as being at this point in the section. */
1897 h->root.u.def.section = s;
1898 h->root.u.def.value = s->_raw_size;
1899
1900 /* Increment the section size to make room for the symbol. */
1901 s->_raw_size += h->size;
1902
1903 return TRUE;
1904 }
1905 \f
1906 /* Set the sizes of the dynamic sections. */
1907
1908 static bfd_boolean
1909 ppc_elf_size_dynamic_sections (output_bfd, info)
1910 bfd *output_bfd ATTRIBUTE_UNUSED;
1911 struct bfd_link_info *info;
1912 {
1913 bfd *dynobj;
1914 asection *s;
1915 bfd_boolean plt;
1916 bfd_boolean relocs;
1917
1918 #ifdef DEBUG
1919 fprintf (stderr, "ppc_elf_size_dynamic_sections called\n");
1920 #endif
1921
1922 dynobj = elf_hash_table (info)->dynobj;
1923 BFD_ASSERT (dynobj != NULL);
1924
1925 if (elf_hash_table (info)->dynamic_sections_created)
1926 {
1927 /* Set the contents of the .interp section to the interpreter. */
1928 if (! info->shared)
1929 {
1930 s = bfd_get_section_by_name (dynobj, ".interp");
1931 BFD_ASSERT (s != NULL);
1932 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1933 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1934 }
1935 }
1936 else
1937 {
1938 /* We may have created entries in the .rela.got, .rela.sdata, and
1939 .rela.sdata2 sections. However, if we are not creating the
1940 dynamic sections, we will not actually use these entries. Reset
1941 the size of .rela.got, et al, which will cause it to get
1942 stripped from the output file below. */
1943 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
1944 ".rela.sdata2", ".rela.sbss",
1945 (char *) 0 };
1946 char **p;
1947
1948 for (p = rela_sections; *p != (char *) 0; p++)
1949 {
1950 s = bfd_get_section_by_name (dynobj, *p);
1951 if (s != NULL)
1952 s->_raw_size = 0;
1953 }
1954 }
1955
1956 /* The check_relocs and adjust_dynamic_symbol entry points have
1957 determined the sizes of the various dynamic sections. Allocate
1958 memory for them. */
1959 plt = FALSE;
1960 relocs = FALSE;
1961 for (s = dynobj->sections; s != NULL; s = s->next)
1962 {
1963 const char *name;
1964 bfd_boolean strip;
1965
1966 if ((s->flags & SEC_LINKER_CREATED) == 0)
1967 continue;
1968
1969 /* It's OK to base decisions on the section name, because none
1970 of the dynobj section names depend upon the input files. */
1971 name = bfd_get_section_name (dynobj, s);
1972
1973 strip = FALSE;
1974
1975 if (strcmp (name, ".plt") == 0)
1976 {
1977 if (s->_raw_size == 0)
1978 {
1979 /* Strip this section if we don't need it; see the
1980 comment below. */
1981 strip = TRUE;
1982 }
1983 else
1984 {
1985 /* Remember whether there is a PLT. */
1986 plt = TRUE;
1987 }
1988 }
1989 else if (strncmp (name, ".rela", 5) == 0)
1990 {
1991 if (s->_raw_size == 0)
1992 {
1993 /* If we don't need this section, strip it from the
1994 output file. This is mostly to handle .rela.bss and
1995 .rela.plt. We must create both sections in
1996 create_dynamic_sections, because they must be created
1997 before the linker maps input sections to output
1998 sections. The linker does that before
1999 adjust_dynamic_symbol is called, and it is that
2000 function which decides whether anything needs to go
2001 into these sections. */
2002 strip = TRUE;
2003 }
2004 else
2005 {
2006 /* Remember whether there are any relocation sections. */
2007 relocs = TRUE;
2008
2009 /* We use the reloc_count field as a counter if we need
2010 to copy relocs into the output file. */
2011 s->reloc_count = 0;
2012 }
2013 }
2014 else if (strcmp (name, ".got") != 0
2015 && strcmp (name, ".sdata") != 0
2016 && strcmp (name, ".sdata2") != 0)
2017 {
2018 /* It's not one of our sections, so don't allocate space. */
2019 continue;
2020 }
2021
2022 if (strip)
2023 {
2024 _bfd_strip_section_from_output (info, s);
2025 continue;
2026 }
2027
2028 /* Allocate memory for the section contents. */
2029 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2030 if (s->contents == NULL && s->_raw_size != 0)
2031 return FALSE;
2032 }
2033
2034 if (elf_hash_table (info)->dynamic_sections_created)
2035 {
2036 /* Add some entries to the .dynamic section. We fill in the
2037 values later, in ppc_elf_finish_dynamic_sections, but we
2038 must add the entries now so that we get the correct size for
2039 the .dynamic section. The DT_DEBUG entry is filled in by the
2040 dynamic linker and used by the debugger. */
2041 #define add_dynamic_entry(TAG, VAL) \
2042 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2043
2044 if (!info->shared)
2045 {
2046 if (!add_dynamic_entry (DT_DEBUG, 0))
2047 return FALSE;
2048 }
2049
2050 if (plt)
2051 {
2052 if (!add_dynamic_entry (DT_PLTGOT, 0)
2053 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2054 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2055 || !add_dynamic_entry (DT_JMPREL, 0))
2056 return FALSE;
2057 }
2058
2059 if (relocs)
2060 {
2061 if (!add_dynamic_entry (DT_RELA, 0)
2062 || !add_dynamic_entry (DT_RELASZ, 0)
2063 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2064 return FALSE;
2065 }
2066
2067 if ((info->flags & DF_TEXTREL) != 0)
2068 {
2069 if (!add_dynamic_entry (DT_TEXTREL, 0))
2070 return FALSE;
2071 info->flags |= DF_TEXTREL;
2072 }
2073 }
2074 #undef add_dynamic_entry
2075
2076 return TRUE;
2077 }
2078 \f
2079 /* Look through the relocs for a section during the first phase, and
2080 allocate space in the global offset table or procedure linkage
2081 table. */
2082
2083 static bfd_boolean
2084 ppc_elf_check_relocs (abfd, info, sec, relocs)
2085 bfd *abfd;
2086 struct bfd_link_info *info;
2087 asection *sec;
2088 const Elf_Internal_Rela *relocs;
2089 {
2090 bfd *dynobj;
2091 Elf_Internal_Shdr *symtab_hdr;
2092 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2093 const Elf_Internal_Rela *rel;
2094 const Elf_Internal_Rela *rel_end;
2095 bfd_signed_vma *local_got_refcounts;
2096 elf_linker_section_t *sdata;
2097 elf_linker_section_t *sdata2;
2098 asection *sreloc;
2099 asection *sgot = NULL;
2100 asection *srelgot = NULL;
2101
2102 if (info->relocateable)
2103 return TRUE;
2104
2105 #ifdef DEBUG
2106 fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n",
2107 bfd_get_section_name (abfd, sec),
2108 bfd_archive_filename (abfd));
2109 #endif
2110
2111 /* Create the linker generated sections all the time so that the
2112 special symbols are created. */
2113
2114 if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL)
2115 {
2116 sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2117 if (!sdata)
2118 return FALSE;
2119 }
2120
2121 if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL)
2122 {
2123 sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2);
2124 if (!sdata2)
2125 return FALSE;
2126 }
2127
2128 dynobj = elf_hash_table (info)->dynobj;
2129 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2130 local_got_refcounts = elf_local_got_refcounts (abfd);
2131
2132 sym_hashes = elf_sym_hashes (abfd);
2133 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
2134 if (!elf_bad_symtab (abfd))
2135 sym_hashes_end -= symtab_hdr->sh_info;
2136
2137 sreloc = NULL;
2138
2139 rel_end = relocs + sec->reloc_count;
2140 for (rel = relocs; rel < rel_end; rel++)
2141 {
2142 unsigned long r_symndx;
2143 struct elf_link_hash_entry *h;
2144
2145 r_symndx = ELF32_R_SYM (rel->r_info);
2146 if (r_symndx < symtab_hdr->sh_info)
2147 h = NULL;
2148 else
2149 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2150
2151 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
2152 This shows up in particular in an R_PPC_ADDR32 in the eabi
2153 startup code. */
2154 if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2155 {
2156 if (sgot == NULL)
2157 {
2158 if (dynobj == NULL)
2159 elf_hash_table (info)->dynobj = dynobj = abfd;
2160 sgot = ppc_elf_create_got (dynobj, info);
2161 if (sgot == NULL)
2162 return FALSE;
2163 }
2164 }
2165
2166 switch (ELF32_R_TYPE (rel->r_info))
2167 {
2168 /* GOT16 relocations */
2169 case R_PPC_GOT16:
2170 case R_PPC_GOT16_LO:
2171 case R_PPC_GOT16_HI:
2172 case R_PPC_GOT16_HA:
2173 /* This symbol requires a global offset table entry. */
2174
2175 if (sgot == NULL)
2176 {
2177 if (dynobj == NULL)
2178 elf_hash_table (info)->dynobj = dynobj = abfd;
2179 sgot = ppc_elf_create_got (dynobj, info);
2180 if (sgot == NULL)
2181 return FALSE;
2182 }
2183
2184 if (srelgot == NULL
2185 && (h != NULL || info->shared))
2186 {
2187 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2188 if (srelgot == NULL)
2189 {
2190 srelgot = bfd_make_section (dynobj, ".rela.got");
2191 if (srelgot == NULL
2192 || ! bfd_set_section_flags (dynobj, srelgot,
2193 (SEC_ALLOC
2194 | SEC_LOAD
2195 | SEC_HAS_CONTENTS
2196 | SEC_IN_MEMORY
2197 | SEC_LINKER_CREATED
2198 | SEC_READONLY))
2199 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2200 return FALSE;
2201 }
2202 }
2203
2204 if (h != NULL)
2205 {
2206 if (h->got.refcount == 0)
2207 {
2208 /* Make sure this symbol is output as a dynamic symbol. */
2209 if (h->dynindx == -1)
2210 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2211 return FALSE;
2212
2213 /* Allocate space in the .got. */
2214 sgot->_raw_size += 4;
2215 /* Allocate relocation space. */
2216 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2217 }
2218 h->got.refcount++;
2219 }
2220 else
2221 {
2222 /* This is a global offset table entry for a local symbol. */
2223 if (local_got_refcounts == NULL)
2224 {
2225 bfd_size_type size;
2226
2227 size = symtab_hdr->sh_info;
2228 size *= sizeof (bfd_signed_vma);
2229 local_got_refcounts
2230 = (bfd_signed_vma *) bfd_zalloc (abfd, size);
2231 if (local_got_refcounts == NULL)
2232 return FALSE;
2233 elf_local_got_refcounts (abfd) = local_got_refcounts;
2234 }
2235 if (local_got_refcounts[r_symndx] == 0)
2236 {
2237 sgot->_raw_size += 4;
2238
2239 /* If we are generating a shared object, we need to
2240 output a R_PPC_RELATIVE reloc so that the
2241 dynamic linker can adjust this GOT entry. */
2242 if (info->shared)
2243 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2244 }
2245 local_got_refcounts[r_symndx]++;
2246 }
2247 break;
2248
2249 /* Indirect .sdata relocation */
2250 case R_PPC_EMB_SDAI16:
2251 if (info->shared)
2252 {
2253 ((*_bfd_error_handler)
2254 (_("%s: relocation %s cannot be used when making a shared object"),
2255 bfd_archive_filename (abfd), "R_PPC_EMB_SDAI16"));
2256 return FALSE;
2257 }
2258
2259 if (srelgot == NULL && (h != NULL || info->shared))
2260 {
2261 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2262 if (srelgot == NULL)
2263 {
2264 srelgot = bfd_make_section (dynobj, ".rela.got");
2265 if (srelgot == NULL
2266 || ! bfd_set_section_flags (dynobj, srelgot,
2267 (SEC_ALLOC
2268 | SEC_LOAD
2269 | SEC_HAS_CONTENTS
2270 | SEC_IN_MEMORY
2271 | SEC_LINKER_CREATED
2272 | SEC_READONLY))
2273 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2274 return FALSE;
2275 }
2276 }
2277
2278 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel))
2279 return FALSE;
2280
2281 break;
2282
2283 /* Indirect .sdata2 relocation */
2284 case R_PPC_EMB_SDA2I16:
2285 if (info->shared)
2286 {
2287 ((*_bfd_error_handler)
2288 (_("%s: relocation %s cannot be used when making a shared object"),
2289 bfd_archive_filename (abfd), "R_PPC_EMB_SDA2I16"));
2290 return FALSE;
2291 }
2292
2293 if (srelgot == NULL && (h != NULL || info->shared))
2294 {
2295 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2296 if (srelgot == NULL)
2297 {
2298 srelgot = bfd_make_section (dynobj, ".rela.got");
2299 if (srelgot == NULL
2300 || ! bfd_set_section_flags (dynobj, srelgot,
2301 (SEC_ALLOC
2302 | SEC_LOAD
2303 | SEC_HAS_CONTENTS
2304 | SEC_IN_MEMORY
2305 | SEC_LINKER_CREATED
2306 | SEC_READONLY))
2307 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
2308 return FALSE;
2309 }
2310 }
2311
2312 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel))
2313 return FALSE;
2314
2315 break;
2316
2317 case R_PPC_SDAREL16:
2318 case R_PPC_EMB_SDA2REL:
2319 case R_PPC_EMB_SDA21:
2320 if (info->shared)
2321 {
2322 ((*_bfd_error_handler)
2323 (_("%s: relocation %s cannot be used when making a shared object"),
2324 bfd_archive_filename (abfd),
2325 ppc_elf_howto_table[(int) ELF32_R_TYPE (rel->r_info)]->name));
2326 return FALSE;
2327 }
2328 break;
2329
2330 case R_PPC_PLT32:
2331 case R_PPC_PLTREL24:
2332 case R_PPC_PLT16_LO:
2333 case R_PPC_PLT16_HI:
2334 case R_PPC_PLT16_HA:
2335 #ifdef DEBUG
2336 fprintf (stderr, "Reloc requires a PLT entry\n");
2337 #endif
2338 /* This symbol requires a procedure linkage table entry. We
2339 actually build the entry in adjust_dynamic_symbol,
2340 because this might be a case of linking PIC code without
2341 linking in any dynamic objects, in which case we don't
2342 need to generate a procedure linkage table after all. */
2343
2344 if (h == NULL)
2345 {
2346 /* It does not make sense to have a procedure linkage
2347 table entry for a local symbol. */
2348 bfd_set_error (bfd_error_bad_value);
2349 return FALSE;
2350 }
2351
2352 /* Make sure this symbol is output as a dynamic symbol. */
2353 if (h->dynindx == -1)
2354 {
2355 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2356 return FALSE;
2357 }
2358 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2359 h->plt.refcount++;
2360 break;
2361
2362 /* The following relocations don't need to propagate the
2363 relocation if linking a shared object since they are
2364 section relative. */
2365 case R_PPC_SECTOFF:
2366 case R_PPC_SECTOFF_LO:
2367 case R_PPC_SECTOFF_HI:
2368 case R_PPC_SECTOFF_HA:
2369 break;
2370
2371 /* This refers only to functions defined in the shared library */
2372 case R_PPC_LOCAL24PC:
2373 break;
2374
2375 /* This relocation describes the C++ object vtable hierarchy.
2376 Reconstruct it for later use during GC. */
2377 case R_PPC_GNU_VTINHERIT:
2378 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2379 return FALSE;
2380 break;
2381
2382 /* This relocation describes which C++ vtable entries are actually
2383 used. Record for later use during GC. */
2384 case R_PPC_GNU_VTENTRY:
2385 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2386 return FALSE;
2387 break;
2388
2389 /* When creating a shared object, we must copy these
2390 relocs into the output file. We create a reloc
2391 section in dynobj and make room for the reloc. */
2392 case R_PPC_REL24:
2393 case R_PPC_REL14:
2394 case R_PPC_REL14_BRTAKEN:
2395 case R_PPC_REL14_BRNTAKEN:
2396 case R_PPC_REL32:
2397 if (h == NULL
2398 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2399 || SYMBOL_REFERENCES_LOCAL (info, h))
2400 break;
2401 /* fall through */
2402
2403 default:
2404 if (info->shared)
2405 {
2406 #ifdef DEBUG
2407 fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n",
2408 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
2409 #endif
2410 if (sreloc == NULL)
2411 {
2412 const char *name;
2413
2414 name = (bfd_elf_string_from_elf_section
2415 (abfd,
2416 elf_elfheader (abfd)->e_shstrndx,
2417 elf_section_data (sec)->rel_hdr.sh_name));
2418 if (name == NULL)
2419 return FALSE;
2420
2421 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2422 && strcmp (bfd_get_section_name (abfd, sec),
2423 name + 5) == 0);
2424
2425 sreloc = bfd_get_section_by_name (dynobj, name);
2426 if (sreloc == NULL)
2427 {
2428 flagword flags;
2429
2430 sreloc = bfd_make_section (dynobj, name);
2431 flags = (SEC_HAS_CONTENTS | SEC_READONLY
2432 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2433 if ((sec->flags & SEC_ALLOC) != 0)
2434 flags |= SEC_ALLOC | SEC_LOAD;
2435 if (sreloc == NULL
2436 || ! bfd_set_section_flags (dynobj, sreloc, flags)
2437 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
2438 return FALSE;
2439 }
2440 if (sec->flags & SEC_READONLY)
2441 info->flags |= DF_TEXTREL;
2442 }
2443
2444 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2445
2446 /* FIXME: We should here do what the m68k and i386
2447 backends do: if the reloc is pc-relative, record it
2448 in case it turns out that the reloc is unnecessary
2449 because the symbol is forced local by versioning or
2450 we are linking with -Bdynamic. Fortunately this
2451 case is not frequent. */
2452 }
2453
2454 break;
2455 }
2456 }
2457
2458 return TRUE;
2459 }
2460
2461 /* Return the section that should be marked against GC for a given
2462 relocation. */
2463
2464 static asection *
2465 ppc_elf_gc_mark_hook (sec, info, rel, h, sym)
2466 asection *sec;
2467 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2468 Elf_Internal_Rela *rel;
2469 struct elf_link_hash_entry *h;
2470 Elf_Internal_Sym *sym;
2471 {
2472 if (h != NULL)
2473 {
2474 switch (ELF32_R_TYPE (rel->r_info))
2475 {
2476 case R_PPC_GNU_VTINHERIT:
2477 case R_PPC_GNU_VTENTRY:
2478 break;
2479
2480 default:
2481 switch (h->root.type)
2482 {
2483 case bfd_link_hash_defined:
2484 case bfd_link_hash_defweak:
2485 return h->root.u.def.section;
2486
2487 case bfd_link_hash_common:
2488 return h->root.u.c.p->section;
2489
2490 default:
2491 break;
2492 }
2493 }
2494 }
2495 else
2496 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
2497
2498 return NULL;
2499 }
2500
2501 /* Update the got entry reference counts for the section being removed. */
2502
2503 static bfd_boolean
2504 ppc_elf_gc_sweep_hook (abfd, info, sec, relocs)
2505 bfd *abfd;
2506 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2507 asection *sec;
2508 const Elf_Internal_Rela *relocs;
2509 {
2510 Elf_Internal_Shdr *symtab_hdr;
2511 struct elf_link_hash_entry **sym_hashes;
2512 bfd_signed_vma *local_got_refcounts;
2513 const Elf_Internal_Rela *rel, *relend;
2514 unsigned long r_symndx;
2515 struct elf_link_hash_entry *h;
2516
2517 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2518 sym_hashes = elf_sym_hashes (abfd);
2519 local_got_refcounts = elf_local_got_refcounts (abfd);
2520
2521 relend = relocs + sec->reloc_count;
2522 for (rel = relocs; rel < relend; rel++)
2523 switch (ELF32_R_TYPE (rel->r_info))
2524 {
2525 case R_PPC_GOT16:
2526 case R_PPC_GOT16_LO:
2527 case R_PPC_GOT16_HI:
2528 case R_PPC_GOT16_HA:
2529 r_symndx = ELF32_R_SYM (rel->r_info);
2530 if (r_symndx >= symtab_hdr->sh_info)
2531 {
2532 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2533 if (h->got.refcount > 0)
2534 h->got.refcount--;
2535 }
2536 else if (local_got_refcounts != NULL)
2537 {
2538 if (local_got_refcounts[r_symndx] > 0)
2539 local_got_refcounts[r_symndx]--;
2540 }
2541 break;
2542
2543 case R_PPC_PLT32:
2544 case R_PPC_PLTREL24:
2545 case R_PPC_PLT16_LO:
2546 case R_PPC_PLT16_HI:
2547 case R_PPC_PLT16_HA:
2548 r_symndx = ELF32_R_SYM (rel->r_info);
2549 if (r_symndx >= symtab_hdr->sh_info)
2550 {
2551 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2552 if (h->plt.refcount > 0)
2553 h->plt.refcount--;
2554 }
2555 break;
2556
2557 default:
2558 break;
2559 }
2560
2561 return TRUE;
2562 }
2563 \f
2564 /* Hook called by the linker routine which adds symbols from an object
2565 file. We use it to put .comm items in .sbss, and not .bss. */
2566
2567 static bfd_boolean
2568 ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
2569 bfd *abfd;
2570 struct bfd_link_info *info;
2571 const Elf_Internal_Sym *sym;
2572 const char **namep ATTRIBUTE_UNUSED;
2573 flagword *flagsp ATTRIBUTE_UNUSED;
2574 asection **secp;
2575 bfd_vma *valp;
2576 {
2577 if (sym->st_shndx == SHN_COMMON
2578 && !info->relocateable
2579 && sym->st_size <= elf_gp_size (abfd)
2580 && info->hash->creator->flavour == bfd_target_elf_flavour)
2581 {
2582 /* Common symbols less than or equal to -G nn bytes are automatically
2583 put into .sdata. */
2584 elf_linker_section_t *sdata
2585 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
2586
2587 if (!sdata->bss_section)
2588 {
2589 bfd_size_type amt;
2590
2591 /* We don't go through bfd_make_section, because we don't
2592 want to attach this common section to DYNOBJ. The linker
2593 will move the symbols to the appropriate output section
2594 when it defines common symbols. */
2595 amt = sizeof (asection);
2596 sdata->bss_section = (asection *) bfd_zalloc (abfd, amt);
2597 if (sdata->bss_section == NULL)
2598 return FALSE;
2599 sdata->bss_section->name = sdata->bss_name;
2600 sdata->bss_section->flags = SEC_IS_COMMON;
2601 sdata->bss_section->output_section = sdata->bss_section;
2602 amt = sizeof (asymbol);
2603 sdata->bss_section->symbol = (asymbol *) bfd_zalloc (abfd, amt);
2604 amt = sizeof (asymbol *);
2605 sdata->bss_section->symbol_ptr_ptr =
2606 (asymbol **) bfd_zalloc (abfd, amt);
2607 if (sdata->bss_section->symbol == NULL
2608 || sdata->bss_section->symbol_ptr_ptr == NULL)
2609 return FALSE;
2610 sdata->bss_section->symbol->name = sdata->bss_name;
2611 sdata->bss_section->symbol->flags = BSF_SECTION_SYM;
2612 sdata->bss_section->symbol->section = sdata->bss_section;
2613 *sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol;
2614 }
2615
2616 *secp = sdata->bss_section;
2617 *valp = sym->st_size;
2618 }
2619
2620 return TRUE;
2621 }
2622 \f
2623 /* Finish up dynamic symbol handling. We set the contents of various
2624 dynamic sections here. */
2625
2626 static bfd_boolean
2627 ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym)
2628 bfd *output_bfd;
2629 struct bfd_link_info *info;
2630 struct elf_link_hash_entry *h;
2631 Elf_Internal_Sym *sym;
2632 {
2633 bfd *dynobj;
2634
2635 #ifdef DEBUG
2636 fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s",
2637 h->root.root.string);
2638 #endif
2639
2640 dynobj = elf_hash_table (info)->dynobj;
2641 BFD_ASSERT (dynobj != NULL);
2642
2643 if (h->plt.offset != (bfd_vma) -1)
2644 {
2645 asection *splt;
2646 asection *srela;
2647 Elf_Internal_Rela rela;
2648 bfd_byte *loc;
2649 bfd_vma reloc_index;
2650
2651 #ifdef DEBUG
2652 fprintf (stderr, ", plt_offset = %d", h->plt.offset);
2653 #endif
2654
2655 /* This symbol has an entry in the procedure linkage table. Set
2656 it up. */
2657
2658 BFD_ASSERT (h->dynindx != -1);
2659
2660 splt = bfd_get_section_by_name (dynobj, ".plt");
2661 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
2662 BFD_ASSERT (splt != NULL && srela != NULL);
2663
2664 /* We don't need to fill in the .plt. The ppc dynamic linker
2665 will fill it in. */
2666
2667 /* Fill in the entry in the .rela.plt section. */
2668 rela.r_offset = (splt->output_section->vma
2669 + splt->output_offset
2670 + h->plt.offset);
2671 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT);
2672 rela.r_addend = 0;
2673
2674 reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE;
2675 if (reloc_index > PLT_NUM_SINGLE_ENTRIES)
2676 reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2;
2677 loc = srela->contents + reloc_index * sizeof (Elf32_External_Rela);
2678 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2679
2680 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2681 {
2682 /* Mark the symbol as undefined, rather than as defined in
2683 the .plt section. Leave the value alone. */
2684 sym->st_shndx = SHN_UNDEF;
2685 /* If the symbol is weak, we do need to clear the value.
2686 Otherwise, the PLT entry would provide a definition for
2687 the symbol even if the symbol wasn't defined anywhere,
2688 and so the symbol would never be NULL. */
2689 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
2690 == 0)
2691 sym->st_value = 0;
2692 }
2693 }
2694
2695 if (h->got.offset != (bfd_vma) -1)
2696 {
2697 asection *sgot;
2698 asection *srela;
2699 Elf_Internal_Rela rela;
2700 bfd_byte *loc;
2701
2702 /* This symbol has an entry in the global offset table. Set it
2703 up. */
2704
2705 sgot = bfd_get_section_by_name (dynobj, ".got");
2706 srela = bfd_get_section_by_name (dynobj, ".rela.got");
2707 BFD_ASSERT (sgot != NULL && srela != NULL);
2708
2709 rela.r_offset = (sgot->output_section->vma
2710 + sgot->output_offset
2711 + (h->got.offset &~ (bfd_vma) 1));
2712
2713 /* If this is a -Bsymbolic link, and the symbol is defined
2714 locally, we just want to emit a RELATIVE reloc. The entry in
2715 the global offset table will already have been initialized in
2716 the relocate_section function. */
2717 if (info->shared
2718 && SYMBOL_REFERENCES_LOCAL (info, h))
2719 {
2720 rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
2721 rela.r_addend = (h->root.u.def.value
2722 + h->root.u.def.section->output_section->vma
2723 + h->root.u.def.section->output_offset);
2724 }
2725 else
2726 {
2727 BFD_ASSERT ((h->got.offset & 1) == 0);
2728 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT);
2729 rela.r_addend = 0;
2730 }
2731
2732 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
2733 loc = srela->contents;
2734 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
2735 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2736 }
2737
2738 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2739 {
2740 asection *s;
2741 Elf_Internal_Rela rela;
2742 bfd_byte *loc;
2743
2744 /* This symbols needs a copy reloc. Set it up. */
2745
2746 #ifdef DEBUG
2747 fprintf (stderr, ", copy");
2748 #endif
2749
2750 BFD_ASSERT (h->dynindx != -1);
2751
2752 if (h->size <= elf_gp_size (dynobj))
2753 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2754 ".rela.sbss");
2755 else
2756 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2757 ".rela.bss");
2758 BFD_ASSERT (s != NULL);
2759
2760 rela.r_offset = (h->root.u.def.value
2761 + h->root.u.def.section->output_section->vma
2762 + h->root.u.def.section->output_offset);
2763 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY);
2764 rela.r_addend = 0;
2765 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
2766 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
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 \f
2782 /* Finish up the dynamic sections. */
2783
2784 static bfd_boolean
2785 ppc_elf_finish_dynamic_sections (output_bfd, info)
2786 bfd *output_bfd;
2787 struct bfd_link_info *info;
2788 {
2789 asection *sdyn;
2790 bfd *dynobj = elf_hash_table (info)->dynobj;
2791 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
2792
2793 #ifdef DEBUG
2794 fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n");
2795 #endif
2796
2797 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2798
2799 if (elf_hash_table (info)->dynamic_sections_created)
2800 {
2801 asection *splt;
2802 Elf32_External_Dyn *dyncon, *dynconend;
2803
2804 splt = bfd_get_section_by_name (dynobj, ".plt");
2805 BFD_ASSERT (splt != NULL && sdyn != NULL);
2806
2807 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2808 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2809 for (; dyncon < dynconend; dyncon++)
2810 {
2811 Elf_Internal_Dyn dyn;
2812 const char *name;
2813 bfd_boolean size;
2814
2815 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2816
2817 switch (dyn.d_tag)
2818 {
2819 case DT_PLTGOT: name = ".plt"; size = FALSE; break;
2820 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
2821 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
2822 default: name = NULL; size = FALSE; break;
2823 }
2824
2825 if (name != NULL)
2826 {
2827 asection *s;
2828
2829 s = bfd_get_section_by_name (output_bfd, name);
2830 if (s == NULL)
2831 dyn.d_un.d_val = 0;
2832 else
2833 {
2834 if (! size)
2835 dyn.d_un.d_ptr = s->vma;
2836 else
2837 {
2838 if (s->_cooked_size != 0)
2839 dyn.d_un.d_val = s->_cooked_size;
2840 else
2841 dyn.d_un.d_val = s->_raw_size;
2842 }
2843 }
2844 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2845 }
2846 }
2847 }
2848
2849 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
2850 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
2851 if (sgot)
2852 {
2853 unsigned char *contents = sgot->contents;
2854 bfd_put_32 (output_bfd, (bfd_vma) 0x4e800021 /* blrl */, contents);
2855
2856 if (sdyn == NULL)
2857 bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
2858 else
2859 bfd_put_32 (output_bfd,
2860 sdyn->output_section->vma + sdyn->output_offset,
2861 contents+4);
2862
2863 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2864 }
2865
2866 return TRUE;
2867 }
2868 \f
2869 /* The RELOCATE_SECTION function is called by the ELF backend linker
2870 to handle the relocations for a section.
2871
2872 The relocs are always passed as Rela structures; if the section
2873 actually uses Rel structures, the r_addend field will always be
2874 zero.
2875
2876 This function is responsible for adjust the section contents as
2877 necessary, and (if using Rela relocs and generating a
2878 relocateable output file) adjusting the reloc addend as
2879 necessary.
2880
2881 This function does not have to worry about setting the reloc
2882 address or the reloc symbol index.
2883
2884 LOCAL_SYMS is a pointer to the swapped in local symbols.
2885
2886 LOCAL_SECTIONS is an array giving the section in the input file
2887 corresponding to the st_shndx field of each local symbol.
2888
2889 The global hash table entry for the global symbols can be found
2890 via elf_sym_hashes (input_bfd).
2891
2892 When generating relocateable output, this function must handle
2893 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
2894 going to be the section symbol corresponding to the output
2895 section, which means that the addend must be adjusted
2896 accordingly. */
2897
2898 static bfd_boolean
2899 ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
2900 contents, relocs, local_syms, local_sections)
2901 bfd *output_bfd;
2902 struct bfd_link_info *info;
2903 bfd *input_bfd;
2904 asection *input_section;
2905 bfd_byte *contents;
2906 Elf_Internal_Rela *relocs;
2907 Elf_Internal_Sym *local_syms;
2908 asection **local_sections;
2909 {
2910 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2911 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
2912 bfd *dynobj = elf_hash_table (info)->dynobj;
2913 elf_linker_section_t *sdata = NULL;
2914 elf_linker_section_t *sdata2 = NULL;
2915 Elf_Internal_Rela *rel = relocs;
2916 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
2917 asection *sreloc = NULL;
2918 asection *splt;
2919 asection *sgot;
2920 bfd_vma *local_got_offsets;
2921 bfd_boolean ret = TRUE;
2922 long insn;
2923
2924 if (dynobj)
2925 {
2926 sdata = elf_linker_section (dynobj, LINKER_SECTION_SDATA);
2927 sdata2 = elf_linker_section (dynobj, LINKER_SECTION_SDATA2);
2928 }
2929
2930 #ifdef DEBUG
2931 fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n",
2932 bfd_archive_filename (input_bfd),
2933 bfd_section_name(input_bfd, input_section),
2934 (long) input_section->reloc_count,
2935 (info->relocateable) ? " (relocatable)" : "");
2936 #endif
2937
2938 if (info->relocateable)
2939 return TRUE;
2940
2941 if (!ppc_elf_howto_table[R_PPC_ADDR32])
2942 /* Initialize howto table if needed. */
2943 ppc_elf_howto_init ();
2944
2945 local_got_offsets = elf_local_got_offsets (input_bfd);
2946
2947 splt = sgot = NULL;
2948 if (dynobj != NULL)
2949 {
2950 splt = bfd_get_section_by_name (dynobj, ".plt");
2951 sgot = bfd_get_section_by_name (dynobj, ".got");
2952 }
2953
2954 for (; rel < relend; rel++)
2955 {
2956 enum elf_ppc_reloc_type r_type = (enum elf_ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
2957 bfd_vma offset = rel->r_offset;
2958 bfd_vma addend = rel->r_addend;
2959 bfd_reloc_status_type r = bfd_reloc_other;
2960 Elf_Internal_Sym *sym = (Elf_Internal_Sym *) 0;
2961 asection *sec = (asection *) 0;
2962 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) 0;
2963 const char *sym_name = (const char *) 0;
2964 reloc_howto_type *howto;
2965 unsigned long r_symndx;
2966 bfd_vma relocation;
2967 int will_become_local;
2968
2969 /* Unknown relocation handling */
2970 if ((unsigned) r_type >= (unsigned) R_PPC_max
2971 || !ppc_elf_howto_table[(int) r_type])
2972 {
2973 (*_bfd_error_handler) (_("%s: unknown relocation type %d"),
2974 bfd_archive_filename (input_bfd),
2975 (int) r_type);
2976
2977 bfd_set_error (bfd_error_bad_value);
2978 ret = FALSE;
2979 continue;
2980 }
2981
2982 howto = ppc_elf_howto_table[(int) r_type];
2983 r_symndx = ELF32_R_SYM (rel->r_info);
2984
2985 if (r_symndx < symtab_hdr->sh_info)
2986 {
2987 sym = local_syms + r_symndx;
2988 sec = local_sections[r_symndx];
2989 sym_name = "<local symbol>";
2990
2991 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
2992 addend = rel->r_addend;
2993 /* Relocs to local symbols are always resolved. */
2994 will_become_local = 1;
2995 }
2996 else
2997 {
2998 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2999 while (h->root.type == bfd_link_hash_indirect
3000 || h->root.type == bfd_link_hash_warning)
3001 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3002 sym_name = h->root.root.string;
3003
3004 /* Can this relocation be resolved immediately? */
3005 will_become_local = SYMBOL_REFERENCES_LOCAL (info, h);
3006
3007 if (h->root.type == bfd_link_hash_defined
3008 || h->root.type == bfd_link_hash_defweak)
3009 {
3010 sec = h->root.u.def.section;
3011 if (((r_type == R_PPC_PLT32
3012 || r_type == R_PPC_PLTREL24)
3013 && splt != NULL
3014 && h->plt.offset != (bfd_vma) -1)
3015 || (r_type == R_PPC_LOCAL24PC
3016 && sec->output_section == NULL)
3017 || ((r_type == R_PPC_GOT16
3018 || r_type == R_PPC_GOT16_LO
3019 || r_type == R_PPC_GOT16_HI
3020 || r_type == R_PPC_GOT16_HA)
3021 && elf_hash_table (info)->dynamic_sections_created
3022 && (! info->shared || ! will_become_local))
3023 || (info->shared
3024 && ! will_become_local
3025 && ((input_section->flags & SEC_ALLOC) != 0
3026 /* Testing SEC_DEBUGGING here may be wrong.
3027 It's here to avoid a crash when
3028 generating a shared library with DWARF
3029 debugging information. */
3030 || ((input_section->flags & SEC_DEBUGGING) != 0
3031 && (h->elf_link_hash_flags
3032 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
3033 && (r_type == R_PPC_ADDR32
3034 || r_type == R_PPC_ADDR24
3035 || r_type == R_PPC_ADDR16
3036 || r_type == R_PPC_ADDR16_LO
3037 || r_type == R_PPC_ADDR16_HI
3038 || r_type == R_PPC_ADDR16_HA
3039 || r_type == R_PPC_ADDR14
3040 || r_type == R_PPC_ADDR14_BRTAKEN
3041 || r_type == R_PPC_ADDR14_BRNTAKEN
3042 || r_type == R_PPC_COPY
3043 || r_type == R_PPC_GLOB_DAT
3044 || r_type == R_PPC_JMP_SLOT
3045 || r_type == R_PPC_UADDR32
3046 || r_type == R_PPC_UADDR16
3047 || r_type == R_PPC_SDAREL16
3048 || r_type == R_PPC_EMB_NADDR32
3049 || r_type == R_PPC_EMB_NADDR16
3050 || r_type == R_PPC_EMB_NADDR16_LO
3051 || r_type == R_PPC_EMB_NADDR16_HI
3052 || r_type == R_PPC_EMB_NADDR16_HA
3053 || r_type == R_PPC_EMB_SDAI16
3054 || r_type == R_PPC_EMB_SDA2I16
3055 || r_type == R_PPC_EMB_SDA2REL
3056 || r_type == R_PPC_EMB_SDA21
3057 || r_type == R_PPC_EMB_MRKREF
3058 || r_type == R_PPC_EMB_BIT_FLD
3059 || r_type == R_PPC_EMB_RELSDA
3060 || ((r_type == R_PPC_REL24
3061 || r_type == R_PPC_REL32
3062 || r_type == R_PPC_REL14
3063 || r_type == R_PPC_REL14_BRTAKEN
3064 || r_type == R_PPC_REL14_BRNTAKEN
3065 || r_type == R_PPC_RELATIVE)
3066 && strcmp (h->root.root.string,
3067 "_GLOBAL_OFFSET_TABLE_") != 0))))
3068 {
3069 /* In these cases, we don't need the relocation
3070 value. We check specially because in some
3071 obscure cases sec->output_section will be NULL. */
3072 relocation = 0;
3073 }
3074 else if (sec->output_section == NULL)
3075 {
3076 (*_bfd_error_handler)
3077 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
3078 bfd_archive_filename (input_bfd), h->root.root.string,
3079 bfd_get_section_name (input_bfd, input_section));
3080 relocation = 0;
3081 }
3082 else
3083 relocation = (h->root.u.def.value
3084 + sec->output_section->vma
3085 + sec->output_offset);
3086 }
3087 else if (h->root.type == bfd_link_hash_undefweak)
3088 relocation = 0;
3089 else if (info->shared
3090 && (!info->symbolic || info->allow_shlib_undefined)
3091 && !info->no_undefined
3092 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
3093 relocation = 0;
3094 else
3095 {
3096 if (! (*info->callbacks->undefined_symbol) (info,
3097 h->root.root.string,
3098 input_bfd,
3099 input_section,
3100 rel->r_offset,
3101 (!info->shared
3102 || info->no_undefined
3103 || ELF_ST_VISIBILITY (h->other))))
3104 return FALSE;
3105 relocation = 0;
3106 }
3107 }
3108
3109 switch ((int) r_type)
3110 {
3111 default:
3112 (*_bfd_error_handler) (_("%s: unknown relocation type %d for symbol %s"),
3113 bfd_archive_filename (input_bfd),
3114 (int) r_type, sym_name);
3115
3116 bfd_set_error (bfd_error_bad_value);
3117 ret = FALSE;
3118 continue;
3119
3120 case (int) R_PPC_NONE:
3121 continue;
3122
3123 /* Relocations that need no special processing. */
3124 case (int) R_PPC_LOCAL24PC:
3125 /* It makes no sense to point a local relocation
3126 at a symbol not in this object. */
3127 if (h != NULL
3128 && (h->root.type == bfd_link_hash_defined
3129 || h->root.type == bfd_link_hash_defweak)
3130 && sec->output_section == NULL)
3131 {
3132 if (! (*info->callbacks->undefined_symbol) (info,
3133 h->root.root.string,
3134 input_bfd,
3135 input_section,
3136 rel->r_offset,
3137 TRUE))
3138 return FALSE;
3139 continue;
3140 }
3141 break;
3142
3143 /* Relocations that may need to be propagated if this is a shared
3144 object. */
3145 case (int) R_PPC_REL24:
3146 case (int) R_PPC_REL32:
3147 case (int) R_PPC_REL14:
3148 /* If these relocations are not to a named symbol, they can be
3149 handled right here, no need to bother the dynamic linker. */
3150 if (h == NULL
3151 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3152 || SYMBOL_REFERENCES_LOCAL (info, h))
3153 break;
3154 /* fall through */
3155
3156 /* Relocations that always need to be propagated if this is a shared
3157 object. */
3158 case (int) R_PPC_ADDR32:
3159 case (int) R_PPC_ADDR24:
3160 case (int) R_PPC_ADDR16:
3161 case (int) R_PPC_ADDR16_LO:
3162 case (int) R_PPC_ADDR16_HI:
3163 case (int) R_PPC_ADDR16_HA:
3164 case (int) R_PPC_ADDR14:
3165 case (int) R_PPC_UADDR32:
3166 case (int) R_PPC_UADDR16:
3167 if (info->shared && r_symndx != 0)
3168 {
3169 Elf_Internal_Rela outrel;
3170 bfd_byte *loc;
3171 int skip;
3172
3173 #ifdef DEBUG
3174 fprintf (stderr, "ppc_elf_relocate_section need to create relocation for %s\n",
3175 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
3176 #endif
3177
3178 /* When generating a shared object, these relocations
3179 are copied into the output file to be resolved at run
3180 time. */
3181
3182 if (sreloc == NULL)
3183 {
3184 const char *name;
3185
3186 name = (bfd_elf_string_from_elf_section
3187 (input_bfd,
3188 elf_elfheader (input_bfd)->e_shstrndx,
3189 elf_section_data (input_section)->rel_hdr.sh_name));
3190 if (name == NULL)
3191 return FALSE;
3192
3193 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
3194 && strcmp (bfd_get_section_name (input_bfd,
3195 input_section),
3196 name + 5) == 0);
3197
3198 sreloc = bfd_get_section_by_name (dynobj, name);
3199 BFD_ASSERT (sreloc != NULL);
3200 }
3201
3202 skip = 0;
3203
3204 outrel.r_offset =
3205 _bfd_elf_section_offset (output_bfd, info, input_section,
3206 rel->r_offset);
3207 if (outrel.r_offset == (bfd_vma) -1
3208 || outrel.r_offset == (bfd_vma) -2)
3209 skip = (int) outrel.r_offset;
3210 outrel.r_offset += (input_section->output_section->vma
3211 + input_section->output_offset);
3212
3213 if (skip)
3214 memset (&outrel, 0, sizeof outrel);
3215 /* h->dynindx may be -1 if this symbol was marked to
3216 become local. */
3217 else if (! will_become_local)
3218 {
3219 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3220 outrel.r_addend = rel->r_addend;
3221 }
3222 else
3223 {
3224 if (r_type == R_PPC_ADDR32)
3225 {
3226 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3227 outrel.r_addend = relocation + rel->r_addend;
3228 }
3229 else
3230 {
3231 long indx;
3232
3233 if (h == NULL)
3234 sec = local_sections[r_symndx];
3235 else
3236 {
3237 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3238 || (h->root.type
3239 == bfd_link_hash_defweak));
3240 sec = h->root.u.def.section;
3241 }
3242 if (sec != NULL && bfd_is_abs_section (sec))
3243 indx = 0;
3244 else if (sec == NULL || sec->owner == NULL)
3245 {
3246 bfd_set_error (bfd_error_bad_value);
3247 return FALSE;
3248 }
3249 else
3250 {
3251 asection *osec;
3252
3253 osec = sec->output_section;
3254 indx = elf_section_data (osec)->dynindx;
3255 BFD_ASSERT (indx > 0);
3256 #ifdef DEBUG
3257 if (indx <= 0)
3258 {
3259 printf ("indx=%d section=%s flags=%08x name=%s\n",
3260 indx, osec->name, osec->flags,
3261 h->root.root.string);
3262 }
3263 #endif
3264 }
3265
3266 outrel.r_info = ELF32_R_INFO (indx, r_type);
3267 outrel.r_addend = relocation + rel->r_addend;
3268 }
3269 }
3270
3271 loc = sreloc->contents;
3272 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3273 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3274
3275 if (skip == -1)
3276 continue;
3277
3278 /* This reloc will be computed at runtime. We clear the memory
3279 so that it contains predictable value. */
3280 if (! skip
3281 && ((input_section->flags & SEC_ALLOC) != 0
3282 || ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE))
3283 {
3284 relocation = howto->pc_relative ? outrel.r_offset : 0;
3285 addend = 0;
3286 break;
3287 }
3288 }
3289
3290 /* Arithmetic adjust relocations that aren't going into a
3291 shared object. */
3292 if (r_type == R_PPC_ADDR16_HA
3293 /* It's just possible that this symbol is a weak symbol
3294 that's not actually defined anywhere. In that case,
3295 'sec' would be NULL, and we should leave the symbol
3296 alone (it will be set to zero elsewhere in the link). */
3297 && sec != NULL)
3298 {
3299 addend += ((relocation + addend) & 0x8000) << 1;
3300 }
3301 break;
3302
3303 /* branch taken prediction relocations */
3304 case (int) R_PPC_ADDR14_BRTAKEN:
3305 case (int) R_PPC_REL14_BRTAKEN:
3306 insn = bfd_get_32 (output_bfd, contents + offset);
3307 if ((relocation - offset) & 0x8000)
3308 insn &= ~BRANCH_PREDICT_BIT;
3309 else
3310 insn |= BRANCH_PREDICT_BIT;
3311 bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
3312 break;
3313
3314 /* branch not taken predicition relocations */
3315 case (int) R_PPC_ADDR14_BRNTAKEN:
3316 case (int) R_PPC_REL14_BRNTAKEN:
3317 insn = bfd_get_32 (output_bfd, contents + offset);
3318 if ((relocation - offset) & 0x8000)
3319 insn |= BRANCH_PREDICT_BIT;
3320 else
3321 insn &= ~BRANCH_PREDICT_BIT;
3322 bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
3323 break;
3324
3325 /* GOT16 relocations */
3326 case (int) R_PPC_GOT16:
3327 case (int) R_PPC_GOT16_LO:
3328 case (int) R_PPC_GOT16_HI:
3329 case (int) R_PPC_GOT16_HA:
3330 /* Relocation is to the entry for this symbol in the global
3331 offset table. */
3332 BFD_ASSERT (sgot != NULL);
3333
3334 if (h != NULL)
3335 {
3336 bfd_vma off;
3337
3338 off = h->got.offset;
3339 BFD_ASSERT (off != (bfd_vma) -1);
3340
3341 if (! elf_hash_table (info)->dynamic_sections_created
3342 || (info->shared
3343 && SYMBOL_REFERENCES_LOCAL (info, h)))
3344 {
3345 /* This is actually a static link, or it is a
3346 -Bsymbolic link and the symbol is defined
3347 locally. We must initialize this entry in the
3348 global offset table. Since the offset must
3349 always be a multiple of 4, we use the least
3350 significant bit to record whether we have
3351 initialized it already.
3352
3353 When doing a dynamic link, we create a .rela.got
3354 relocation entry to initialize the value. This
3355 is done in the finish_dynamic_symbol routine. */
3356 if ((off & 1) != 0)
3357 off &= ~1;
3358 else
3359 {
3360 bfd_put_32 (output_bfd, relocation,
3361 sgot->contents + off);
3362 h->got.offset |= 1;
3363 }
3364 }
3365
3366 relocation = sgot->output_offset + off - 4;
3367 }
3368 else
3369 {
3370 bfd_vma off;
3371
3372 BFD_ASSERT (local_got_offsets != NULL
3373 && local_got_offsets[r_symndx] != (bfd_vma) -1);
3374
3375 off = local_got_offsets[r_symndx];
3376
3377 /* The offset must always be a multiple of 4. We use
3378 the least significant bit to record whether we have
3379 already processed this entry. */
3380 if ((off & 1) != 0)
3381 off &= ~1;
3382 else
3383 {
3384
3385 if (info->shared)
3386 {
3387 asection *srelgot;
3388 Elf_Internal_Rela outrel;
3389 bfd_byte *loc;
3390
3391 /* We need to generate a R_PPC_RELATIVE reloc
3392 for the dynamic linker. */
3393 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
3394 BFD_ASSERT (srelgot != NULL);
3395
3396 outrel.r_offset = (sgot->output_section->vma
3397 + sgot->output_offset
3398 + off);
3399 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
3400 outrel.r_addend = relocation;
3401 loc = srelgot->contents;
3402 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3403 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3404 relocation = 0;
3405 }
3406
3407 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
3408 local_got_offsets[r_symndx] |= 1;
3409 }
3410
3411 relocation = sgot->output_offset + off - 4;
3412 }
3413 break;
3414
3415 /* Indirect .sdata relocation */
3416 case (int) R_PPC_EMB_SDAI16:
3417 BFD_ASSERT (sdata != NULL);
3418 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3419 sdata, h, relocation, rel,
3420 R_PPC_RELATIVE);
3421 break;
3422
3423 /* Indirect .sdata2 relocation */
3424 case (int) R_PPC_EMB_SDA2I16:
3425 BFD_ASSERT (sdata2 != NULL);
3426 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
3427 sdata2, h, relocation, rel,
3428 R_PPC_RELATIVE);
3429 break;
3430
3431 /* Handle the TOC16 reloc. We want to use the offset within the .got
3432 section, not the actual VMA. This is appropriate when generating
3433 an embedded ELF object, for which the .got section acts like the
3434 AIX .toc section. */
3435 case (int) R_PPC_TOC16: /* phony GOT16 relocations */
3436 BFD_ASSERT (sec != (asection *) 0);
3437 BFD_ASSERT (bfd_is_und_section (sec)
3438 || strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
3439 || strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0)
3440
3441 addend -= sec->output_section->vma + sec->output_offset + 0x8000;
3442 break;
3443
3444 case (int) R_PPC_PLTREL24:
3445 /* Relocation is to the entry for this symbol in the
3446 procedure linkage table. */
3447 BFD_ASSERT (h != NULL);
3448
3449 if (h->plt.offset == (bfd_vma) -1
3450 || splt == NULL)
3451 {
3452 /* We didn't make a PLT entry for this symbol. This
3453 happens when statically linking PIC code, or when
3454 using -Bsymbolic. */
3455 break;
3456 }
3457
3458 relocation = (splt->output_section->vma
3459 + splt->output_offset
3460 + h->plt.offset);
3461 break;
3462
3463 /* relocate against _SDA_BASE_ */
3464 case (int) R_PPC_SDAREL16:
3465 {
3466 const char *name;
3467
3468 BFD_ASSERT (sec != (asection *) 0);
3469 name = bfd_get_section_name (abfd, sec->output_section);
3470 if (! ((strncmp (name, ".sdata", 6) == 0
3471 && (name[6] == 0 || name[6] == '.'))
3472 || (strncmp (name, ".sbss", 5) == 0
3473 && (name[5] == 0 || name[5] == '.'))))
3474 {
3475 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3476 bfd_archive_filename (input_bfd),
3477 sym_name,
3478 ppc_elf_howto_table[(int) r_type]->name,
3479 name);
3480 }
3481 addend -= (sdata->sym_hash->root.u.def.value
3482 + sdata->sym_hash->root.u.def.section->output_section->vma
3483 + sdata->sym_hash->root.u.def.section->output_offset);
3484 }
3485 break;
3486
3487 /* relocate against _SDA2_BASE_ */
3488 case (int) R_PPC_EMB_SDA2REL:
3489 {
3490 const char *name;
3491
3492 BFD_ASSERT (sec != (asection *) 0);
3493 name = bfd_get_section_name (abfd, sec->output_section);
3494 if (! (strncmp (name, ".sdata2", 7) == 0
3495 || strncmp (name, ".sbss2", 6) == 0))
3496 {
3497 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3498 bfd_archive_filename (input_bfd),
3499 sym_name,
3500 ppc_elf_howto_table[(int) r_type]->name,
3501 name);
3502
3503 bfd_set_error (bfd_error_bad_value);
3504 ret = FALSE;
3505 continue;
3506 }
3507 addend -= (sdata2->sym_hash->root.u.def.value
3508 + sdata2->sym_hash->root.u.def.section->output_section->vma
3509 + sdata2->sym_hash->root.u.def.section->output_offset);
3510 }
3511 break;
3512
3513 /* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */
3514 case (int) R_PPC_EMB_SDA21:
3515 case (int) R_PPC_EMB_RELSDA:
3516 {
3517 const char *name;
3518 int reg;
3519
3520 BFD_ASSERT (sec != (asection *) 0);
3521 name = bfd_get_section_name (abfd, sec->output_section);
3522 if (((strncmp (name, ".sdata", 6) == 0
3523 && (name[6] == 0 || name[6] == '.'))
3524 || (strncmp (name, ".sbss", 5) == 0
3525 && (name[5] == 0 || name[5] == '.'))))
3526 {
3527 reg = 13;
3528 addend -= (sdata->sym_hash->root.u.def.value
3529 + sdata->sym_hash->root.u.def.section->output_section->vma
3530 + sdata->sym_hash->root.u.def.section->output_offset);
3531 }
3532
3533 else if (strncmp (name, ".sdata2", 7) == 0
3534 || strncmp (name, ".sbss2", 6) == 0)
3535 {
3536 reg = 2;
3537 addend -= (sdata2->sym_hash->root.u.def.value
3538 + sdata2->sym_hash->root.u.def.section->output_section->vma
3539 + sdata2->sym_hash->root.u.def.section->output_offset);
3540 }
3541
3542 else if (strcmp (name, ".PPC.EMB.sdata0") == 0
3543 || strcmp (name, ".PPC.EMB.sbss0") == 0)
3544 {
3545 reg = 0;
3546 }
3547
3548 else
3549 {
3550 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
3551 bfd_archive_filename (input_bfd),
3552 sym_name,
3553 ppc_elf_howto_table[(int) r_type]->name,
3554 name);
3555
3556 bfd_set_error (bfd_error_bad_value);
3557 ret = FALSE;
3558 continue;
3559 }
3560
3561 if (r_type == R_PPC_EMB_SDA21)
3562 { /* fill in register field */
3563 insn = bfd_get_32 (output_bfd, contents + offset);
3564 insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT);
3565 bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
3566 }
3567 }
3568 break;
3569
3570 /* Relocate against the beginning of the section */
3571 case (int) R_PPC_SECTOFF:
3572 case (int) R_PPC_SECTOFF_LO:
3573 case (int) R_PPC_SECTOFF_HI:
3574 BFD_ASSERT (sec != (asection *) 0);
3575 addend -= sec->output_section->vma;
3576 break;
3577
3578 case (int) R_PPC_SECTOFF_HA:
3579 BFD_ASSERT (sec != (asection *) 0);
3580 addend -= sec->output_section->vma;
3581 addend += ((relocation + addend) & 0x8000) << 1;
3582 break;
3583
3584 /* Negative relocations */
3585 case (int) R_PPC_EMB_NADDR32:
3586 case (int) R_PPC_EMB_NADDR16:
3587 case (int) R_PPC_EMB_NADDR16_LO:
3588 case (int) R_PPC_EMB_NADDR16_HI:
3589 addend -= 2 * relocation;
3590 break;
3591
3592 case (int) R_PPC_EMB_NADDR16_HA:
3593 addend -= 2 * relocation;
3594 addend += ((relocation + addend) & 0x8000) << 1;
3595 break;
3596
3597 /* NOP relocation that prevents garbage collecting linkers from omitting a
3598 reference. */
3599 case (int) R_PPC_EMB_MRKREF:
3600 continue;
3601
3602 case (int) R_PPC_COPY:
3603 case (int) R_PPC_GLOB_DAT:
3604 case (int) R_PPC_JMP_SLOT:
3605 case (int) R_PPC_RELATIVE:
3606 case (int) R_PPC_PLT32:
3607 case (int) R_PPC_PLTREL32:
3608 case (int) R_PPC_PLT16_LO:
3609 case (int) R_PPC_PLT16_HI:
3610 case (int) R_PPC_PLT16_HA:
3611 case (int) R_PPC_EMB_RELSEC16:
3612 case (int) R_PPC_EMB_RELST_LO:
3613 case (int) R_PPC_EMB_RELST_HI:
3614 case (int) R_PPC_EMB_RELST_HA:
3615 case (int) R_PPC_EMB_BIT_FLD:
3616 (*_bfd_error_handler) (_("%s: Relocation %s is not yet supported for symbol %s."),
3617 bfd_archive_filename (input_bfd),
3618 ppc_elf_howto_table[(int) r_type]->name,
3619 sym_name);
3620
3621 bfd_set_error (bfd_error_invalid_operation);
3622 ret = FALSE;
3623 continue;
3624
3625 case (int) R_PPC_GNU_VTINHERIT:
3626 case (int) R_PPC_GNU_VTENTRY:
3627 /* These are no-ops in the end. */
3628 continue;
3629 }
3630
3631 #ifdef DEBUG
3632 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
3633 howto->name,
3634 (int) r_type,
3635 sym_name,
3636 r_symndx,
3637 (long) offset,
3638 (long) addend);
3639 #endif
3640
3641 r = _bfd_final_link_relocate (howto,
3642 input_bfd,
3643 input_section,
3644 contents,
3645 offset,
3646 relocation,
3647 addend);
3648
3649 if (r == bfd_reloc_ok)
3650 ;
3651 else if (r == bfd_reloc_overflow)
3652 {
3653 const char *name;
3654
3655 if (h != NULL)
3656 {
3657 if (h->root.type == bfd_link_hash_undefweak
3658 && howto->pc_relative)
3659 {
3660 /* Assume this is a call protected by other code that
3661 detect the symbol is undefined. If this is the case,
3662 we can safely ignore the overflow. If not, the
3663 program is hosed anyway, and a little warning isn't
3664 going to help. */
3665
3666 continue;
3667 }
3668
3669 name = h->root.root.string;
3670 }
3671 else
3672 {
3673 name = bfd_elf_string_from_elf_section (input_bfd,
3674 symtab_hdr->sh_link,
3675 sym->st_name);
3676 if (name == NULL)
3677 continue;
3678 if (*name == '\0')
3679 name = bfd_section_name (input_bfd, sec);
3680 }
3681
3682 if (! (*info->callbacks->reloc_overflow) (info,
3683 name,
3684 howto->name,
3685 (bfd_vma) 0,
3686 input_bfd,
3687 input_section,
3688 offset))
3689 return FALSE;
3690 }
3691 else
3692 ret = FALSE;
3693 }
3694
3695 #ifdef DEBUG
3696 fprintf (stderr, "\n");
3697 #endif
3698
3699 return ret;
3700 }
3701
3702 static enum elf_reloc_type_class
3703 ppc_elf_reloc_type_class (rela)
3704 const Elf_Internal_Rela *rela;
3705 {
3706 switch ((int) ELF32_R_TYPE (rela->r_info))
3707 {
3708 case R_PPC_RELATIVE:
3709 return reloc_class_relative;
3710 case R_PPC_REL24:
3711 case R_PPC_ADDR24:
3712 case R_PPC_JMP_SLOT:
3713 return reloc_class_plt;
3714 case R_PPC_COPY:
3715 return reloc_class_copy;
3716 default:
3717 return reloc_class_normal;
3718 }
3719 }
3720 \f
3721 /* Support for core dump NOTE sections */
3722 static bfd_boolean
3723 ppc_elf_grok_prstatus (abfd, note)
3724 bfd *abfd;
3725 Elf_Internal_Note *note;
3726 {
3727 int offset;
3728 unsigned int raw_size;
3729
3730 switch (note->descsz)
3731 {
3732 default:
3733 return FALSE;
3734
3735 case 268: /* Linux/PPC */
3736 /* pr_cursig */
3737 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3738
3739 /* pr_pid */
3740 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3741
3742 /* pr_reg */
3743 offset = 72;
3744 raw_size = 192;
3745
3746 break;
3747 }
3748
3749 /* Make a ".reg/999" section. */
3750 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3751 raw_size, note->descpos + offset);
3752 }
3753
3754 static bfd_boolean
3755 ppc_elf_grok_psinfo (abfd, note)
3756 bfd *abfd;
3757 Elf_Internal_Note *note;
3758 {
3759 switch (note->descsz)
3760 {
3761 default:
3762 return FALSE;
3763
3764 case 128: /* Linux/PPC elf_prpsinfo */
3765 elf_tdata (abfd)->core_program
3766 = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
3767 elf_tdata (abfd)->core_command
3768 = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
3769 }
3770
3771 /* Note that for some reason, a spurious space is tacked
3772 onto the end of the args in some (at least one anyway)
3773 implementations, so strip it off if it exists. */
3774
3775 {
3776 char *command = elf_tdata (abfd)->core_command;
3777 int n = strlen (command);
3778
3779 if (0 < n && command[n - 1] == ' ')
3780 command[n - 1] = '\0';
3781 }
3782
3783 return TRUE;
3784 }
3785 \f
3786 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
3787 #define TARGET_LITTLE_NAME "elf32-powerpcle"
3788 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
3789 #define TARGET_BIG_NAME "elf32-powerpc"
3790 #define ELF_ARCH bfd_arch_powerpc
3791 #define ELF_MACHINE_CODE EM_PPC
3792 #define ELF_MAXPAGESIZE 0x10000
3793 #define elf_info_to_howto ppc_elf_info_to_howto
3794
3795 #ifdef EM_CYGNUS_POWERPC
3796 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
3797 #endif
3798
3799 #ifdef EM_PPC_OLD
3800 #define ELF_MACHINE_ALT2 EM_PPC_OLD
3801 #endif
3802
3803 #define elf_backend_plt_not_loaded 1
3804 #define elf_backend_got_symbol_offset 4
3805 #define elf_backend_can_gc_sections 1
3806 #define elf_backend_can_refcount 1
3807 #define elf_backend_got_header_size 12
3808 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
3809 #define elf_backend_rela_normal 1
3810
3811 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
3812 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
3813 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
3814 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
3815 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
3816
3817 #define elf_backend_object_p ppc_elf_object_p
3818 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
3819 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
3820 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
3821 #define elf_backend_relocate_section ppc_elf_relocate_section
3822 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
3823 #define elf_backend_check_relocs ppc_elf_check_relocs
3824 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
3825 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
3826 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
3827 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
3828 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
3829 #define elf_backend_fake_sections ppc_elf_fake_sections
3830 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
3831 #define elf_backend_modify_segment_map ppc_elf_modify_segment_map
3832 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
3833 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
3834 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
3835
3836 #include "elf32-target.h"
GDB Binutils - Deliverables
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