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252b5132 RH |
1 | /* PowerPC-specific support for 32-bit ELF |
2 | Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc. | |
3 | Written by Ian Lance Taylor, Cygnus Support. | |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | /* This file is based on a preliminary PowerPC ELF ABI. The | |
22 | information may not match the final PowerPC ELF ABI. It includes | |
23 | suggestions from the in-progress Embedded PowerPC ABI, and that | |
24 | information may also not match. */ | |
25 | ||
26 | #include "bfd.h" | |
27 | #include "sysdep.h" | |
28 | #include "bfdlink.h" | |
29 | #include "libbfd.h" | |
30 | #include "elf-bfd.h" | |
31 | #include "elf/ppc.h" | |
32 | ||
33 | #define USE_RELA /* we want RELA relocations, not REL */ | |
34 | ||
35 | ||
36 | static reloc_howto_type *ppc_elf_reloc_type_lookup | |
37 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); | |
38 | static void ppc_elf_info_to_howto | |
39 | PARAMS ((bfd *abfd, arelent *cache_ptr, Elf32_Internal_Rela *dst)); | |
40 | static void ppc_elf_howto_init PARAMS ((void)); | |
41 | static bfd_reloc_status_type ppc_elf_addr16_ha_reloc | |
42 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); | |
43 | static boolean ppc_elf_set_private_flags PARAMS ((bfd *, flagword)); | |
44 | static boolean ppc_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *)); | |
45 | static boolean ppc_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); | |
46 | ||
47 | static int ppc_elf_additional_program_headers PARAMS ((bfd *)); | |
48 | static boolean ppc_elf_modify_segment_map PARAMS ((bfd *)); | |
49 | ||
50 | static boolean ppc_elf_create_dynamic_sections | |
51 | PARAMS ((bfd *, struct bfd_link_info *)); | |
52 | ||
53 | static boolean ppc_elf_section_from_shdr PARAMS ((bfd *, | |
54 | Elf32_Internal_Shdr *, | |
55 | char *)); | |
56 | static boolean ppc_elf_fake_sections | |
57 | PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); | |
58 | ||
59 | static elf_linker_section_t *ppc_elf_create_linker_section | |
60 | PARAMS ((bfd *abfd, | |
61 | struct bfd_link_info *info, | |
62 | enum elf_linker_section_enum)); | |
63 | ||
64 | static boolean ppc_elf_check_relocs PARAMS ((bfd *, | |
65 | struct bfd_link_info *, | |
66 | asection *, | |
67 | const Elf_Internal_Rela *)); | |
68 | ||
69 | static asection * ppc_elf_gc_mark_hook PARAMS ((bfd *abfd, | |
70 | struct bfd_link_info *info, | |
71 | Elf_Internal_Rela *rel, | |
72 | struct elf_link_hash_entry *h, | |
73 | Elf_Internal_Sym *sym)); | |
74 | ||
75 | static boolean ppc_elf_gc_sweep_hook PARAMS ((bfd *abfd, | |
76 | struct bfd_link_info *info, | |
77 | asection *sec, | |
78 | const Elf_Internal_Rela *relocs)); | |
79 | ||
80 | static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *, | |
81 | struct elf_link_hash_entry *)); | |
82 | ||
252b5132 RH |
83 | static boolean ppc_elf_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); |
84 | ||
85 | static boolean ppc_elf_relocate_section PARAMS ((bfd *, | |
86 | struct bfd_link_info *info, | |
87 | bfd *, | |
88 | asection *, | |
89 | bfd_byte *, | |
90 | Elf_Internal_Rela *relocs, | |
91 | Elf_Internal_Sym *local_syms, | |
92 | asection **)); | |
93 | ||
94 | static boolean ppc_elf_add_symbol_hook PARAMS ((bfd *, | |
95 | struct bfd_link_info *, | |
96 | const Elf_Internal_Sym *, | |
97 | const char **, | |
98 | flagword *, | |
99 | asection **, | |
100 | bfd_vma *)); | |
101 | ||
102 | static boolean ppc_elf_finish_dynamic_symbol PARAMS ((bfd *, | |
103 | struct bfd_link_info *, | |
104 | struct elf_link_hash_entry *, | |
105 | Elf_Internal_Sym *)); | |
106 | ||
107 | static boolean ppc_elf_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); | |
108 | ||
109 | #define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */ | |
110 | #define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */ | |
111 | #define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */ | |
112 | ||
113 | /* The name of the dynamic interpreter. This is put in the .interp | |
114 | section. */ | |
115 | ||
116 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" | |
117 | ||
118 | /* The size in bytes of an entry in the procedure linkage table. */ | |
119 | #define PLT_ENTRY_SIZE 12 | |
120 | /* The initial size of the plt reserved for the dynamic linker. */ | |
121 | #define PLT_INITIAL_ENTRY_SIZE 72 | |
122 | /* The size of the gap between entries in the PLT. */ | |
123 | #define PLT_SLOT_SIZE 8 | |
124 | /* The number of single-slot PLT entries (the rest use two slots). */ | |
125 | #define PLT_NUM_SINGLE_ENTRIES 8192 | |
126 | ||
e1e0340b GK |
127 | /* Will references to this symbol always reference the symbol |
128 | in this object? */ | |
129 | #define SYMBOL_REFERENCES_LOCAL(INFO, H) \ | |
130 | ((! INFO->shared \ | |
131 | || INFO->symbolic \ | |
132 | || H->dynindx == -1 \ | |
133 | || ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \ | |
134 | || ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \ | |
135 | && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) | |
136 | ||
137 | /* Will _calls_ to this symbol always call the version in this object? */ | |
138 | #define SYMBOL_CALLS_LOCAL(INFO, H) \ | |
139 | ((! INFO->shared \ | |
140 | || INFO->symbolic \ | |
141 | || H->dynindx == -1 \ | |
142 | || ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \ | |
143 | && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) | |
252b5132 RH |
144 | \f |
145 | static reloc_howto_type *ppc_elf_howto_table[ (int)R_PPC_max ]; | |
146 | ||
147 | static reloc_howto_type ppc_elf_howto_raw[] = | |
148 | { | |
149 | /* This reloc does nothing. */ | |
150 | HOWTO (R_PPC_NONE, /* type */ | |
151 | 0, /* rightshift */ | |
152 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
153 | 32, /* bitsize */ | |
154 | false, /* pc_relative */ | |
155 | 0, /* bitpos */ | |
156 | complain_overflow_bitfield, /* complain_on_overflow */ | |
157 | bfd_elf_generic_reloc, /* special_function */ | |
158 | "R_PPC_NONE", /* name */ | |
159 | false, /* partial_inplace */ | |
160 | 0, /* src_mask */ | |
161 | 0, /* dst_mask */ | |
162 | false), /* pcrel_offset */ | |
163 | ||
164 | /* A standard 32 bit relocation. */ | |
165 | HOWTO (R_PPC_ADDR32, /* type */ | |
166 | 0, /* rightshift */ | |
167 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
168 | 32, /* bitsize */ | |
169 | false, /* pc_relative */ | |
170 | 0, /* bitpos */ | |
171 | complain_overflow_bitfield, /* complain_on_overflow */ | |
172 | bfd_elf_generic_reloc, /* special_function */ | |
173 | "R_PPC_ADDR32", /* name */ | |
174 | false, /* partial_inplace */ | |
175 | 0, /* src_mask */ | |
176 | 0xffffffff, /* dst_mask */ | |
177 | false), /* pcrel_offset */ | |
178 | ||
179 | /* An absolute 26 bit branch; the lower two bits must be zero. | |
180 | FIXME: we don't check that, we just clear them. */ | |
181 | HOWTO (R_PPC_ADDR24, /* type */ | |
182 | 0, /* rightshift */ | |
183 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
184 | 26, /* bitsize */ | |
185 | false, /* pc_relative */ | |
186 | 0, /* bitpos */ | |
187 | complain_overflow_bitfield, /* complain_on_overflow */ | |
188 | bfd_elf_generic_reloc, /* special_function */ | |
189 | "R_PPC_ADDR24", /* name */ | |
190 | false, /* partial_inplace */ | |
191 | 0, /* src_mask */ | |
192 | 0x3fffffc, /* dst_mask */ | |
193 | false), /* pcrel_offset */ | |
194 | ||
195 | /* A standard 16 bit relocation. */ | |
196 | HOWTO (R_PPC_ADDR16, /* type */ | |
197 | 0, /* rightshift */ | |
198 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
199 | 16, /* bitsize */ | |
200 | false, /* pc_relative */ | |
201 | 0, /* bitpos */ | |
202 | complain_overflow_bitfield, /* complain_on_overflow */ | |
203 | bfd_elf_generic_reloc, /* special_function */ | |
204 | "R_PPC_ADDR16", /* name */ | |
205 | false, /* partial_inplace */ | |
206 | 0, /* src_mask */ | |
207 | 0xffff, /* dst_mask */ | |
208 | false), /* pcrel_offset */ | |
209 | ||
210 | /* A 16 bit relocation without overflow. */ | |
211 | HOWTO (R_PPC_ADDR16_LO, /* type */ | |
212 | 0, /* rightshift */ | |
213 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
214 | 16, /* bitsize */ | |
215 | false, /* pc_relative */ | |
216 | 0, /* bitpos */ | |
217 | complain_overflow_dont,/* complain_on_overflow */ | |
218 | bfd_elf_generic_reloc, /* special_function */ | |
219 | "R_PPC_ADDR16_LO", /* name */ | |
220 | false, /* partial_inplace */ | |
221 | 0, /* src_mask */ | |
222 | 0xffff, /* dst_mask */ | |
223 | false), /* pcrel_offset */ | |
224 | ||
225 | /* The high order 16 bits of an address. */ | |
226 | HOWTO (R_PPC_ADDR16_HI, /* type */ | |
227 | 16, /* rightshift */ | |
228 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
229 | 16, /* bitsize */ | |
230 | false, /* pc_relative */ | |
231 | 0, /* bitpos */ | |
232 | complain_overflow_dont, /* complain_on_overflow */ | |
233 | bfd_elf_generic_reloc, /* special_function */ | |
234 | "R_PPC_ADDR16_HI", /* name */ | |
235 | false, /* partial_inplace */ | |
236 | 0, /* src_mask */ | |
237 | 0xffff, /* dst_mask */ | |
238 | false), /* pcrel_offset */ | |
239 | ||
240 | /* The high order 16 bits of an address, plus 1 if the contents of | |
241 | the low 16 bits, treated as a signed number, is negative. */ | |
242 | HOWTO (R_PPC_ADDR16_HA, /* type */ | |
243 | 16, /* rightshift */ | |
244 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
245 | 16, /* bitsize */ | |
246 | false, /* pc_relative */ | |
247 | 0, /* bitpos */ | |
248 | complain_overflow_dont, /* complain_on_overflow */ | |
249 | ppc_elf_addr16_ha_reloc, /* special_function */ | |
250 | "R_PPC_ADDR16_HA", /* name */ | |
251 | false, /* partial_inplace */ | |
252 | 0, /* src_mask */ | |
253 | 0xffff, /* dst_mask */ | |
254 | false), /* pcrel_offset */ | |
255 | ||
256 | /* An absolute 16 bit branch; the lower two bits must be zero. | |
257 | FIXME: we don't check that, we just clear them. */ | |
258 | HOWTO (R_PPC_ADDR14, /* type */ | |
259 | 0, /* rightshift */ | |
260 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
261 | 16, /* bitsize */ | |
262 | false, /* pc_relative */ | |
263 | 0, /* bitpos */ | |
264 | complain_overflow_bitfield, /* complain_on_overflow */ | |
265 | bfd_elf_generic_reloc, /* special_function */ | |
266 | "R_PPC_ADDR14", /* name */ | |
267 | false, /* partial_inplace */ | |
268 | 0, /* src_mask */ | |
269 | 0xfffc, /* dst_mask */ | |
270 | false), /* pcrel_offset */ | |
271 | ||
272 | /* An absolute 16 bit branch, for which bit 10 should be set to | |
273 | indicate that the branch is expected to be taken. The lower two | |
274 | bits must be zero. */ | |
275 | HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */ | |
276 | 0, /* rightshift */ | |
277 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
278 | 16, /* bitsize */ | |
279 | false, /* pc_relative */ | |
280 | 0, /* bitpos */ | |
281 | complain_overflow_bitfield, /* complain_on_overflow */ | |
282 | bfd_elf_generic_reloc, /* special_function */ | |
283 | "R_PPC_ADDR14_BRTAKEN",/* name */ | |
284 | false, /* partial_inplace */ | |
285 | 0, /* src_mask */ | |
286 | 0xfffc, /* dst_mask */ | |
287 | false), /* pcrel_offset */ | |
288 | ||
289 | /* An absolute 16 bit branch, for which bit 10 should be set to | |
290 | indicate that the branch is not expected to be taken. The lower | |
291 | two bits must be zero. */ | |
292 | HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */ | |
293 | 0, /* rightshift */ | |
294 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
295 | 16, /* bitsize */ | |
296 | false, /* pc_relative */ | |
297 | 0, /* bitpos */ | |
298 | complain_overflow_bitfield, /* complain_on_overflow */ | |
299 | bfd_elf_generic_reloc, /* special_function */ | |
300 | "R_PPC_ADDR14_BRNTAKEN",/* name */ | |
301 | false, /* partial_inplace */ | |
302 | 0, /* src_mask */ | |
303 | 0xfffc, /* dst_mask */ | |
304 | false), /* pcrel_offset */ | |
305 | ||
306 | /* A relative 26 bit branch; the lower two bits must be zero. */ | |
307 | HOWTO (R_PPC_REL24, /* type */ | |
308 | 0, /* rightshift */ | |
309 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
310 | 26, /* bitsize */ | |
311 | true, /* pc_relative */ | |
312 | 0, /* bitpos */ | |
313 | complain_overflow_signed, /* complain_on_overflow */ | |
314 | bfd_elf_generic_reloc, /* special_function */ | |
315 | "R_PPC_REL24", /* name */ | |
316 | false, /* partial_inplace */ | |
317 | 0, /* src_mask */ | |
318 | 0x3fffffc, /* dst_mask */ | |
319 | true), /* pcrel_offset */ | |
320 | ||
321 | /* A relative 16 bit branch; the lower two bits must be zero. */ | |
322 | HOWTO (R_PPC_REL14, /* type */ | |
323 | 0, /* rightshift */ | |
324 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
325 | 16, /* bitsize */ | |
326 | true, /* pc_relative */ | |
327 | 0, /* bitpos */ | |
328 | complain_overflow_signed, /* complain_on_overflow */ | |
329 | bfd_elf_generic_reloc, /* special_function */ | |
330 | "R_PPC_REL14", /* name */ | |
331 | false, /* partial_inplace */ | |
332 | 0, /* src_mask */ | |
333 | 0xfffc, /* dst_mask */ | |
334 | true), /* pcrel_offset */ | |
335 | ||
336 | /* A relative 16 bit branch. Bit 10 should be set to indicate that | |
337 | the branch is expected to be taken. The lower two bits must be | |
338 | zero. */ | |
339 | HOWTO (R_PPC_REL14_BRTAKEN, /* type */ | |
340 | 0, /* rightshift */ | |
341 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
342 | 16, /* bitsize */ | |
343 | true, /* pc_relative */ | |
344 | 0, /* bitpos */ | |
345 | complain_overflow_signed, /* complain_on_overflow */ | |
346 | bfd_elf_generic_reloc, /* special_function */ | |
347 | "R_PPC_REL14_BRTAKEN", /* name */ | |
348 | false, /* partial_inplace */ | |
349 | 0, /* src_mask */ | |
350 | 0xfffc, /* dst_mask */ | |
351 | true), /* pcrel_offset */ | |
352 | ||
353 | /* A relative 16 bit branch. Bit 10 should be set to indicate that | |
354 | the branch is not expected to be taken. The lower two bits must | |
355 | be zero. */ | |
356 | HOWTO (R_PPC_REL14_BRNTAKEN, /* type */ | |
357 | 0, /* rightshift */ | |
358 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
359 | 16, /* bitsize */ | |
360 | true, /* pc_relative */ | |
361 | 0, /* bitpos */ | |
362 | complain_overflow_signed, /* complain_on_overflow */ | |
363 | bfd_elf_generic_reloc, /* special_function */ | |
364 | "R_PPC_REL14_BRNTAKEN",/* name */ | |
365 | false, /* partial_inplace */ | |
366 | 0, /* src_mask */ | |
367 | 0xfffc, /* dst_mask */ | |
368 | true), /* pcrel_offset */ | |
369 | ||
370 | /* Like R_PPC_ADDR16, but referring to the GOT table entry for the | |
371 | symbol. */ | |
372 | HOWTO (R_PPC_GOT16, /* type */ | |
373 | 0, /* rightshift */ | |
374 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
375 | 16, /* bitsize */ | |
376 | false, /* pc_relative */ | |
377 | 0, /* bitpos */ | |
378 | complain_overflow_signed, /* complain_on_overflow */ | |
379 | bfd_elf_generic_reloc, /* special_function */ | |
380 | "R_PPC_GOT16", /* name */ | |
381 | false, /* partial_inplace */ | |
382 | 0, /* src_mask */ | |
383 | 0xffff, /* dst_mask */ | |
384 | false), /* pcrel_offset */ | |
385 | ||
386 | /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for | |
387 | the symbol. */ | |
388 | HOWTO (R_PPC_GOT16_LO, /* type */ | |
389 | 0, /* rightshift */ | |
390 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
391 | 16, /* bitsize */ | |
392 | false, /* pc_relative */ | |
393 | 0, /* bitpos */ | |
394 | complain_overflow_dont, /* complain_on_overflow */ | |
395 | bfd_elf_generic_reloc, /* special_function */ | |
396 | "R_PPC_GOT16_LO", /* name */ | |
397 | false, /* partial_inplace */ | |
398 | 0, /* src_mask */ | |
399 | 0xffff, /* dst_mask */ | |
400 | false), /* pcrel_offset */ | |
401 | ||
402 | /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for | |
403 | the symbol. */ | |
404 | HOWTO (R_PPC_GOT16_HI, /* type */ | |
405 | 16, /* rightshift */ | |
406 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
407 | 16, /* bitsize */ | |
408 | false, /* pc_relative */ | |
409 | 0, /* bitpos */ | |
410 | complain_overflow_bitfield, /* complain_on_overflow */ | |
411 | bfd_elf_generic_reloc, /* special_function */ | |
412 | "R_PPC_GOT16_HI", /* name */ | |
413 | false, /* partial_inplace */ | |
414 | 0, /* src_mask */ | |
415 | 0xffff, /* dst_mask */ | |
416 | false), /* pcrel_offset */ | |
417 | ||
418 | /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for | |
419 | the symbol. */ | |
420 | HOWTO (R_PPC_GOT16_HA, /* type */ | |
421 | 16, /* rightshift */ | |
422 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
423 | 16, /* bitsize */ | |
424 | false, /* pc_relative */ | |
425 | 0, /* bitpos */ | |
426 | complain_overflow_bitfield, /* complain_on_overflow */ | |
427 | ppc_elf_addr16_ha_reloc, /* special_function */ | |
428 | "R_PPC_GOT16_HA", /* name */ | |
429 | false, /* partial_inplace */ | |
430 | 0, /* src_mask */ | |
431 | 0xffff, /* dst_mask */ | |
432 | false), /* pcrel_offset */ | |
433 | ||
434 | /* Like R_PPC_REL24, but referring to the procedure linkage table | |
435 | entry for the symbol. */ | |
436 | HOWTO (R_PPC_PLTREL24, /* type */ | |
437 | 0, /* rightshift */ | |
438 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
439 | 26, /* bitsize */ | |
440 | true, /* pc_relative */ | |
441 | 0, /* bitpos */ | |
442 | complain_overflow_signed, /* complain_on_overflow */ | |
443 | bfd_elf_generic_reloc, /* special_function */ | |
444 | "R_PPC_PLTREL24", /* name */ | |
445 | false, /* partial_inplace */ | |
446 | 0, /* src_mask */ | |
447 | 0x3fffffc, /* dst_mask */ | |
448 | true), /* pcrel_offset */ | |
449 | ||
450 | /* This is used only by the dynamic linker. The symbol should exist | |
451 | both in the object being run and in some shared library. The | |
452 | dynamic linker copies the data addressed by the symbol from the | |
453 | shared library into the object, because the object being | |
454 | run has to have the data at some particular address. */ | |
455 | HOWTO (R_PPC_COPY, /* type */ | |
456 | 0, /* rightshift */ | |
457 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
458 | 32, /* bitsize */ | |
459 | false, /* pc_relative */ | |
460 | 0, /* bitpos */ | |
461 | complain_overflow_bitfield, /* complain_on_overflow */ | |
462 | bfd_elf_generic_reloc, /* special_function */ | |
463 | "R_PPC_COPY", /* name */ | |
464 | false, /* partial_inplace */ | |
465 | 0, /* src_mask */ | |
466 | 0, /* dst_mask */ | |
467 | false), /* pcrel_offset */ | |
468 | ||
469 | /* Like R_PPC_ADDR32, but used when setting global offset table | |
470 | entries. */ | |
471 | HOWTO (R_PPC_GLOB_DAT, /* type */ | |
472 | 0, /* rightshift */ | |
473 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
474 | 32, /* bitsize */ | |
475 | false, /* pc_relative */ | |
476 | 0, /* bitpos */ | |
477 | complain_overflow_bitfield, /* complain_on_overflow */ | |
478 | bfd_elf_generic_reloc, /* special_function */ | |
479 | "R_PPC_GLOB_DAT", /* name */ | |
480 | false, /* partial_inplace */ | |
481 | 0, /* src_mask */ | |
482 | 0xffffffff, /* dst_mask */ | |
483 | false), /* pcrel_offset */ | |
484 | ||
485 | /* Marks a procedure linkage table entry for a symbol. */ | |
486 | HOWTO (R_PPC_JMP_SLOT, /* type */ | |
487 | 0, /* rightshift */ | |
488 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
489 | 32, /* bitsize */ | |
490 | false, /* pc_relative */ | |
491 | 0, /* bitpos */ | |
492 | complain_overflow_bitfield, /* complain_on_overflow */ | |
493 | bfd_elf_generic_reloc, /* special_function */ | |
494 | "R_PPC_JMP_SLOT", /* name */ | |
495 | false, /* partial_inplace */ | |
496 | 0, /* src_mask */ | |
497 | 0, /* dst_mask */ | |
498 | false), /* pcrel_offset */ | |
499 | ||
500 | /* Used only by the dynamic linker. When the object is run, this | |
501 | longword is set to the load address of the object, plus the | |
502 | addend. */ | |
503 | HOWTO (R_PPC_RELATIVE, /* type */ | |
504 | 0, /* rightshift */ | |
505 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
506 | 32, /* bitsize */ | |
507 | false, /* pc_relative */ | |
508 | 0, /* bitpos */ | |
509 | complain_overflow_bitfield, /* complain_on_overflow */ | |
510 | bfd_elf_generic_reloc, /* special_function */ | |
511 | "R_PPC_RELATIVE", /* name */ | |
512 | false, /* partial_inplace */ | |
513 | 0, /* src_mask */ | |
514 | 0xffffffff, /* dst_mask */ | |
515 | false), /* pcrel_offset */ | |
516 | ||
517 | /* Like R_PPC_REL24, but uses the value of the symbol within the | |
518 | object rather than the final value. Normally used for | |
519 | _GLOBAL_OFFSET_TABLE_. */ | |
520 | HOWTO (R_PPC_LOCAL24PC, /* type */ | |
521 | 0, /* rightshift */ | |
522 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
523 | 26, /* bitsize */ | |
524 | true, /* pc_relative */ | |
525 | 0, /* bitpos */ | |
526 | complain_overflow_signed, /* complain_on_overflow */ | |
527 | bfd_elf_generic_reloc, /* special_function */ | |
528 | "R_PPC_LOCAL24PC", /* name */ | |
529 | false, /* partial_inplace */ | |
530 | 0, /* src_mask */ | |
531 | 0x3fffffc, /* dst_mask */ | |
532 | true), /* pcrel_offset */ | |
533 | ||
534 | /* Like R_PPC_ADDR32, but may be unaligned. */ | |
535 | HOWTO (R_PPC_UADDR32, /* type */ | |
536 | 0, /* rightshift */ | |
537 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
538 | 32, /* bitsize */ | |
539 | false, /* pc_relative */ | |
540 | 0, /* bitpos */ | |
541 | complain_overflow_bitfield, /* complain_on_overflow */ | |
542 | bfd_elf_generic_reloc, /* special_function */ | |
543 | "R_PPC_UADDR32", /* name */ | |
544 | false, /* partial_inplace */ | |
545 | 0, /* src_mask */ | |
546 | 0xffffffff, /* dst_mask */ | |
547 | false), /* pcrel_offset */ | |
548 | ||
549 | /* Like R_PPC_ADDR16, but may be unaligned. */ | |
550 | HOWTO (R_PPC_UADDR16, /* type */ | |
551 | 0, /* rightshift */ | |
552 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
553 | 16, /* bitsize */ | |
554 | false, /* pc_relative */ | |
555 | 0, /* bitpos */ | |
556 | complain_overflow_bitfield, /* complain_on_overflow */ | |
557 | bfd_elf_generic_reloc, /* special_function */ | |
558 | "R_PPC_UADDR16", /* name */ | |
559 | false, /* partial_inplace */ | |
560 | 0, /* src_mask */ | |
561 | 0xffff, /* dst_mask */ | |
562 | false), /* pcrel_offset */ | |
563 | ||
564 | /* 32-bit PC relative */ | |
565 | HOWTO (R_PPC_REL32, /* type */ | |
566 | 0, /* rightshift */ | |
567 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
568 | 32, /* bitsize */ | |
569 | true, /* pc_relative */ | |
570 | 0, /* bitpos */ | |
571 | complain_overflow_bitfield, /* complain_on_overflow */ | |
572 | bfd_elf_generic_reloc, /* special_function */ | |
573 | "R_PPC_REL32", /* name */ | |
574 | false, /* partial_inplace */ | |
575 | 0, /* src_mask */ | |
576 | 0xffffffff, /* dst_mask */ | |
577 | true), /* pcrel_offset */ | |
578 | ||
579 | /* 32-bit relocation to the symbol's procedure linkage table. | |
580 | FIXME: not supported. */ | |
581 | HOWTO (R_PPC_PLT32, /* type */ | |
582 | 0, /* rightshift */ | |
583 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
584 | 32, /* bitsize */ | |
585 | false, /* pc_relative */ | |
586 | 0, /* bitpos */ | |
587 | complain_overflow_bitfield, /* complain_on_overflow */ | |
588 | bfd_elf_generic_reloc, /* special_function */ | |
589 | "R_PPC_PLT32", /* name */ | |
590 | false, /* partial_inplace */ | |
591 | 0, /* src_mask */ | |
592 | 0, /* dst_mask */ | |
593 | false), /* pcrel_offset */ | |
594 | ||
595 | /* 32-bit PC relative relocation to the symbol's procedure linkage table. | |
596 | FIXME: not supported. */ | |
597 | HOWTO (R_PPC_PLTREL32, /* type */ | |
598 | 0, /* rightshift */ | |
599 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
600 | 32, /* bitsize */ | |
601 | true, /* pc_relative */ | |
602 | 0, /* bitpos */ | |
603 | complain_overflow_bitfield, /* complain_on_overflow */ | |
604 | bfd_elf_generic_reloc, /* special_function */ | |
605 | "R_PPC_PLTREL32", /* name */ | |
606 | false, /* partial_inplace */ | |
607 | 0, /* src_mask */ | |
608 | 0, /* dst_mask */ | |
609 | true), /* pcrel_offset */ | |
610 | ||
611 | /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for | |
612 | the symbol. */ | |
613 | HOWTO (R_PPC_PLT16_LO, /* type */ | |
614 | 0, /* rightshift */ | |
615 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
616 | 16, /* bitsize */ | |
617 | false, /* pc_relative */ | |
618 | 0, /* bitpos */ | |
619 | complain_overflow_dont, /* complain_on_overflow */ | |
620 | bfd_elf_generic_reloc, /* special_function */ | |
621 | "R_PPC_PLT16_LO", /* name */ | |
622 | false, /* partial_inplace */ | |
623 | 0, /* src_mask */ | |
624 | 0xffff, /* dst_mask */ | |
625 | false), /* pcrel_offset */ | |
626 | ||
627 | /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for | |
628 | the symbol. */ | |
629 | HOWTO (R_PPC_PLT16_HI, /* type */ | |
630 | 16, /* rightshift */ | |
631 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
632 | 16, /* bitsize */ | |
633 | false, /* pc_relative */ | |
634 | 0, /* bitpos */ | |
635 | complain_overflow_bitfield, /* complain_on_overflow */ | |
636 | bfd_elf_generic_reloc, /* special_function */ | |
637 | "R_PPC_PLT16_HI", /* name */ | |
638 | false, /* partial_inplace */ | |
639 | 0, /* src_mask */ | |
640 | 0xffff, /* dst_mask */ | |
641 | false), /* pcrel_offset */ | |
642 | ||
643 | /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for | |
644 | the symbol. */ | |
645 | HOWTO (R_PPC_PLT16_HA, /* type */ | |
646 | 16, /* rightshift */ | |
647 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
648 | 16, /* bitsize */ | |
649 | false, /* pc_relative */ | |
650 | 0, /* bitpos */ | |
651 | complain_overflow_bitfield, /* complain_on_overflow */ | |
652 | ppc_elf_addr16_ha_reloc, /* special_function */ | |
653 | "R_PPC_PLT16_HA", /* name */ | |
654 | false, /* partial_inplace */ | |
655 | 0, /* src_mask */ | |
656 | 0xffff, /* dst_mask */ | |
657 | false), /* pcrel_offset */ | |
658 | ||
659 | /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with | |
660 | small data items. */ | |
661 | HOWTO (R_PPC_SDAREL16, /* type */ | |
662 | 0, /* rightshift */ | |
663 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
664 | 16, /* bitsize */ | |
665 | false, /* pc_relative */ | |
666 | 0, /* bitpos */ | |
667 | complain_overflow_signed, /* complain_on_overflow */ | |
668 | bfd_elf_generic_reloc, /* special_function */ | |
669 | "R_PPC_SDAREL16", /* name */ | |
670 | false, /* partial_inplace */ | |
671 | 0, /* src_mask */ | |
672 | 0xffff, /* dst_mask */ | |
673 | false), /* pcrel_offset */ | |
674 | ||
675 | /* 32-bit section relative relocation. */ | |
676 | HOWTO (R_PPC_SECTOFF, /* type */ | |
677 | 0, /* rightshift */ | |
678 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
679 | 32, /* bitsize */ | |
680 | true, /* pc_relative */ | |
681 | 0, /* bitpos */ | |
682 | complain_overflow_bitfield, /* complain_on_overflow */ | |
683 | bfd_elf_generic_reloc, /* special_function */ | |
684 | "R_PPC_SECTOFF", /* name */ | |
685 | false, /* partial_inplace */ | |
686 | 0, /* src_mask */ | |
687 | 0, /* dst_mask */ | |
688 | true), /* pcrel_offset */ | |
689 | ||
690 | /* 16-bit lower half section relative relocation. */ | |
691 | HOWTO (R_PPC_SECTOFF_LO, /* type */ | |
692 | 0, /* rightshift */ | |
693 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
694 | 16, /* bitsize */ | |
695 | false, /* pc_relative */ | |
696 | 0, /* bitpos */ | |
697 | complain_overflow_dont, /* complain_on_overflow */ | |
698 | bfd_elf_generic_reloc, /* special_function */ | |
699 | "R_PPC_SECTOFF_LO", /* name */ | |
700 | false, /* partial_inplace */ | |
701 | 0, /* src_mask */ | |
702 | 0xffff, /* dst_mask */ | |
703 | false), /* pcrel_offset */ | |
704 | ||
705 | /* 16-bit upper half section relative relocation. */ | |
706 | HOWTO (R_PPC_SECTOFF_HI, /* type */ | |
707 | 16, /* rightshift */ | |
708 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
709 | 16, /* bitsize */ | |
710 | false, /* pc_relative */ | |
711 | 0, /* bitpos */ | |
712 | complain_overflow_bitfield, /* complain_on_overflow */ | |
713 | bfd_elf_generic_reloc, /* special_function */ | |
714 | "R_PPC_SECTOFF_HI", /* name */ | |
715 | false, /* partial_inplace */ | |
716 | 0, /* src_mask */ | |
717 | 0xffff, /* dst_mask */ | |
718 | false), /* pcrel_offset */ | |
719 | ||
720 | /* 16-bit upper half adjusted section relative relocation. */ | |
721 | HOWTO (R_PPC_SECTOFF_HA, /* type */ | |
722 | 16, /* rightshift */ | |
723 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
724 | 16, /* bitsize */ | |
725 | false, /* pc_relative */ | |
726 | 0, /* bitpos */ | |
727 | complain_overflow_bitfield, /* complain_on_overflow */ | |
728 | ppc_elf_addr16_ha_reloc, /* special_function */ | |
729 | "R_PPC_SECTOFF_HA", /* name */ | |
730 | false, /* partial_inplace */ | |
731 | 0, /* src_mask */ | |
732 | 0xffff, /* dst_mask */ | |
733 | false), /* pcrel_offset */ | |
734 | ||
735 | /* The remaining relocs are from the Embedded ELF ABI, and are not | |
736 | in the SVR4 ELF ABI. */ | |
737 | ||
738 | /* 32 bit value resulting from the addend minus the symbol */ | |
739 | HOWTO (R_PPC_EMB_NADDR32, /* type */ | |
740 | 0, /* rightshift */ | |
741 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
742 | 32, /* bitsize */ | |
743 | false, /* pc_relative */ | |
744 | 0, /* bitpos */ | |
745 | complain_overflow_bitfield, /* complain_on_overflow */ | |
746 | bfd_elf_generic_reloc, /* special_function */ | |
747 | "R_PPC_EMB_NADDR32", /* name */ | |
748 | false, /* partial_inplace */ | |
749 | 0, /* src_mask */ | |
750 | 0xffffffff, /* dst_mask */ | |
751 | false), /* pcrel_offset */ | |
752 | ||
753 | /* 16 bit value resulting from the addend minus the symbol */ | |
754 | HOWTO (R_PPC_EMB_NADDR16, /* type */ | |
755 | 0, /* rightshift */ | |
756 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
757 | 16, /* bitsize */ | |
758 | false, /* pc_relative */ | |
759 | 0, /* bitpos */ | |
760 | complain_overflow_bitfield, /* complain_on_overflow */ | |
761 | bfd_elf_generic_reloc, /* special_function */ | |
762 | "R_PPC_EMB_NADDR16", /* name */ | |
763 | false, /* partial_inplace */ | |
764 | 0, /* src_mask */ | |
765 | 0xffff, /* dst_mask */ | |
766 | false), /* pcrel_offset */ | |
767 | ||
768 | /* 16 bit value resulting from the addend minus the symbol */ | |
769 | HOWTO (R_PPC_EMB_NADDR16_LO, /* type */ | |
770 | 0, /* rightshift */ | |
771 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
772 | 16, /* bitsize */ | |
773 | false, /* pc_relative */ | |
774 | 0, /* bitpos */ | |
775 | complain_overflow_dont,/* complain_on_overflow */ | |
776 | bfd_elf_generic_reloc, /* special_function */ | |
777 | "R_PPC_EMB_ADDR16_LO", /* name */ | |
778 | false, /* partial_inplace */ | |
779 | 0, /* src_mask */ | |
780 | 0xffff, /* dst_mask */ | |
781 | false), /* pcrel_offset */ | |
782 | ||
783 | /* The high order 16 bits of the addend minus the symbol */ | |
784 | HOWTO (R_PPC_EMB_NADDR16_HI, /* type */ | |
785 | 16, /* rightshift */ | |
786 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
787 | 16, /* bitsize */ | |
788 | false, /* pc_relative */ | |
789 | 0, /* bitpos */ | |
790 | complain_overflow_dont, /* complain_on_overflow */ | |
791 | bfd_elf_generic_reloc, /* special_function */ | |
792 | "R_PPC_EMB_NADDR16_HI", /* name */ | |
793 | false, /* partial_inplace */ | |
794 | 0, /* src_mask */ | |
795 | 0xffff, /* dst_mask */ | |
796 | false), /* pcrel_offset */ | |
797 | ||
798 | /* The high order 16 bits of the result of the addend minus the address, | |
799 | plus 1 if the contents of the low 16 bits, treated as a signed number, | |
800 | is negative. */ | |
801 | HOWTO (R_PPC_EMB_NADDR16_HA, /* type */ | |
802 | 16, /* rightshift */ | |
803 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
804 | 16, /* bitsize */ | |
805 | false, /* pc_relative */ | |
806 | 0, /* bitpos */ | |
807 | complain_overflow_dont, /* complain_on_overflow */ | |
808 | ppc_elf_addr16_ha_reloc, /* special_function */ | |
809 | "R_PPC_EMB_NADDR16_HA", /* name */ | |
810 | false, /* partial_inplace */ | |
811 | 0, /* src_mask */ | |
812 | 0xffff, /* dst_mask */ | |
813 | false), /* pcrel_offset */ | |
814 | ||
815 | /* 16 bit value resulting from allocating a 4 byte word to hold an | |
816 | address in the .sdata section, and returning the offset from | |
817 | _SDA_BASE_ for that relocation */ | |
818 | HOWTO (R_PPC_EMB_SDAI16, /* type */ | |
819 | 0, /* rightshift */ | |
820 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
821 | 16, /* bitsize */ | |
822 | false, /* pc_relative */ | |
823 | 0, /* bitpos */ | |
824 | complain_overflow_bitfield, /* complain_on_overflow */ | |
825 | bfd_elf_generic_reloc, /* special_function */ | |
826 | "R_PPC_EMB_SDAI16", /* name */ | |
827 | false, /* partial_inplace */ | |
828 | 0, /* src_mask */ | |
829 | 0xffff, /* dst_mask */ | |
830 | false), /* pcrel_offset */ | |
831 | ||
832 | /* 16 bit value resulting from allocating a 4 byte word to hold an | |
833 | address in the .sdata2 section, and returning the offset from | |
834 | _SDA2_BASE_ for that relocation */ | |
835 | HOWTO (R_PPC_EMB_SDA2I16, /* type */ | |
836 | 0, /* rightshift */ | |
837 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
838 | 16, /* bitsize */ | |
839 | false, /* pc_relative */ | |
840 | 0, /* bitpos */ | |
841 | complain_overflow_bitfield, /* complain_on_overflow */ | |
842 | bfd_elf_generic_reloc, /* special_function */ | |
843 | "R_PPC_EMB_SDA2I16", /* name */ | |
844 | false, /* partial_inplace */ | |
845 | 0, /* src_mask */ | |
846 | 0xffff, /* dst_mask */ | |
847 | false), /* pcrel_offset */ | |
848 | ||
849 | /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with | |
850 | small data items. */ | |
851 | HOWTO (R_PPC_EMB_SDA2REL, /* type */ | |
852 | 0, /* rightshift */ | |
853 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
854 | 16, /* bitsize */ | |
855 | false, /* pc_relative */ | |
856 | 0, /* bitpos */ | |
857 | complain_overflow_signed, /* complain_on_overflow */ | |
858 | bfd_elf_generic_reloc, /* special_function */ | |
859 | "R_PPC_EMB_SDA2REL", /* name */ | |
860 | false, /* partial_inplace */ | |
861 | 0, /* src_mask */ | |
862 | 0xffff, /* dst_mask */ | |
863 | false), /* pcrel_offset */ | |
864 | ||
865 | /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit | |
866 | signed offset from the appropriate base, and filling in the register | |
867 | field with the appropriate register (0, 2, or 13). */ | |
868 | HOWTO (R_PPC_EMB_SDA21, /* type */ | |
869 | 0, /* rightshift */ | |
870 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
871 | 16, /* bitsize */ | |
872 | false, /* pc_relative */ | |
873 | 0, /* bitpos */ | |
874 | complain_overflow_signed, /* complain_on_overflow */ | |
875 | bfd_elf_generic_reloc, /* special_function */ | |
876 | "R_PPC_EMB_SDA21", /* name */ | |
877 | false, /* partial_inplace */ | |
878 | 0, /* src_mask */ | |
879 | 0xffff, /* dst_mask */ | |
880 | false), /* pcrel_offset */ | |
881 | ||
882 | /* Relocation not handled: R_PPC_EMB_MRKREF */ | |
883 | /* Relocation not handled: R_PPC_EMB_RELSEC16 */ | |
884 | /* Relocation not handled: R_PPC_EMB_RELST_LO */ | |
885 | /* Relocation not handled: R_PPC_EMB_RELST_HI */ | |
886 | /* Relocation not handled: R_PPC_EMB_RELST_HA */ | |
887 | /* Relocation not handled: R_PPC_EMB_BIT_FLD */ | |
888 | ||
889 | /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling | |
890 | in the 16 bit signed offset from the appropriate base, and filling in the | |
891 | register field with the appropriate register (0, 2, or 13). */ | |
892 | HOWTO (R_PPC_EMB_RELSDA, /* type */ | |
893 | 0, /* rightshift */ | |
894 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
895 | 16, /* bitsize */ | |
896 | true, /* pc_relative */ | |
897 | 0, /* bitpos */ | |
898 | complain_overflow_signed, /* complain_on_overflow */ | |
899 | bfd_elf_generic_reloc, /* special_function */ | |
900 | "R_PPC_EMB_RELSDA", /* name */ | |
901 | false, /* partial_inplace */ | |
902 | 0, /* src_mask */ | |
903 | 0xffff, /* dst_mask */ | |
904 | false), /* pcrel_offset */ | |
905 | ||
906 | /* GNU extension to record C++ vtable hierarchy */ | |
907 | HOWTO (R_PPC_GNU_VTINHERIT, /* type */ | |
908 | 0, /* rightshift */ | |
909 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
910 | 0, /* bitsize */ | |
911 | false, /* pc_relative */ | |
912 | 0, /* bitpos */ | |
913 | complain_overflow_dont, /* complain_on_overflow */ | |
914 | NULL, /* special_function */ | |
915 | "R_PPC_GNU_VTINHERIT", /* name */ | |
916 | false, /* partial_inplace */ | |
917 | 0, /* src_mask */ | |
918 | 0, /* dst_mask */ | |
919 | false), /* pcrel_offset */ | |
920 | ||
921 | /* GNU extension to record C++ vtable member usage */ | |
922 | HOWTO (R_PPC_GNU_VTENTRY, /* type */ | |
923 | 0, /* rightshift */ | |
924 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
925 | 0, /* bitsize */ | |
926 | false, /* pc_relative */ | |
927 | 0, /* bitpos */ | |
928 | complain_overflow_dont, /* complain_on_overflow */ | |
929 | NULL, /* special_function */ | |
930 | "R_PPC_GNU_VTENTRY", /* name */ | |
931 | false, /* partial_inplace */ | |
932 | 0, /* src_mask */ | |
933 | 0, /* dst_mask */ | |
934 | false), /* pcrel_offset */ | |
935 | ||
936 | /* Phony reloc to handle AIX style TOC entries */ | |
937 | HOWTO (R_PPC_TOC16, /* type */ | |
938 | 0, /* rightshift */ | |
939 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
940 | 16, /* bitsize */ | |
941 | false, /* pc_relative */ | |
942 | 0, /* bitpos */ | |
943 | complain_overflow_signed, /* complain_on_overflow */ | |
944 | bfd_elf_generic_reloc, /* special_function */ | |
945 | "R_PPC_TOC16", /* name */ | |
946 | false, /* partial_inplace */ | |
947 | 0, /* src_mask */ | |
948 | 0xffff, /* dst_mask */ | |
949 | false), /* pcrel_offset */ | |
950 | }; | |
951 | ||
952 | \f | |
953 | /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */ | |
954 | ||
955 | static void | |
956 | ppc_elf_howto_init () | |
957 | { | |
958 | unsigned int i, type; | |
959 | ||
960 | for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++) | |
961 | { | |
962 | type = ppc_elf_howto_raw[i].type; | |
963 | BFD_ASSERT (type < sizeof(ppc_elf_howto_table) / sizeof(ppc_elf_howto_table[0])); | |
964 | ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i]; | |
965 | } | |
966 | } | |
967 | ||
968 | \f | |
969 | /* This function handles relaxing for the PPC with option --mpc860c0[=<n>]. | |
970 | ||
971 | The MPC860, revision C0 or earlier contains a bug in the die. | |
972 | If all of the following conditions are true, the next instruction | |
973 | to be executed *may* be treated as a no-op. | |
974 | 1/ A forward branch is executed. | |
975 | 2/ The branch is predicted as not taken. | |
976 | 3/ The branch is taken. | |
977 | 4/ The branch is located in the last 5 words of a page. | |
978 | (The EOP limit is 5 by default but may be specified as any value from 1-10.) | |
979 | ||
980 | Our software solution is to detect these problematic branches in a | |
981 | linker pass and modify them as follows: | |
982 | 1/ Unconditional branches - Since these are always predicted taken, | |
983 | there is no problem and no action is required. | |
984 | 2/ Conditional backward branches - No problem, no action required. | |
985 | 3/ Conditional forward branches - Ensure that the "inverse prediction | |
986 | bit" is set (ensure it is predicted taken). | |
987 | 4/ Conditional register branches - Ensure that the "y bit" is set | |
988 | (ensure it is predicted taken). | |
989 | */ | |
990 | ||
991 | /* Sort sections by address. */ | |
992 | ||
993 | static int | |
994 | ppc_elf_sort_rela (arg1, arg2) | |
995 | const void *arg1; | |
996 | const void *arg2; | |
997 | { | |
998 | const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1; | |
999 | const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2; | |
1000 | ||
1001 | /* Sort by offset. */ | |
1002 | return ((*rela1)->r_offset - (*rela2)->r_offset); | |
1003 | } | |
1004 | ||
1005 | static boolean | |
1006 | ppc_elf_relax_section (abfd, isec, link_info, again) | |
1007 | bfd *abfd; | |
1008 | asection *isec; | |
1009 | struct bfd_link_info *link_info; | |
1010 | boolean *again; | |
1011 | { | |
1012 | #define PAGESIZE 0x1000 | |
1013 | ||
1014 | bfd_byte *contents = NULL; | |
1015 | bfd_byte *free_contents = NULL; | |
1016 | Elf_Internal_Rela *internal_relocs = NULL; | |
1017 | Elf_Internal_Rela *free_relocs = NULL; | |
1018 | Elf_Internal_Rela **rela_comb = NULL; | |
1019 | int comb_curr, comb_count; | |
1020 | ||
1021 | /* We never have to do this more than once per input section. */ | |
1022 | *again = false; | |
1023 | ||
1024 | /* If needed, initialize this section's cooked size. */ | |
1025 | if (isec->_cooked_size == 0) | |
1026 | isec->_cooked_size = isec->_raw_size; | |
1027 | ||
1028 | /* We're only interested in text sections which overlap the | |
1029 | troublesome area at the end of a page. */ | |
1030 | if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size) | |
1031 | { | |
1032 | bfd_vma dot, end_page, end_section; | |
1033 | boolean section_modified; | |
1034 | ||
1035 | /* Get the section contents. */ | |
1036 | /* Get cached copy if it exists. */ | |
1037 | if (elf_section_data (isec)->this_hdr.contents != NULL) | |
1038 | contents = elf_section_data (isec)->this_hdr.contents; | |
1039 | else | |
1040 | { | |
1041 | /* Go get them off disk. */ | |
1042 | contents = (bfd_byte *) bfd_malloc (isec->_raw_size); | |
1043 | if (contents == NULL) | |
1044 | goto error_return; | |
1045 | free_contents = contents; | |
1046 | ||
1047 | if (! bfd_get_section_contents (abfd, isec, contents, | |
1048 | (file_ptr) 0, isec->_raw_size)) | |
1049 | goto error_return; | |
1050 | } | |
1051 | ||
1052 | comb_curr = 0; | |
1053 | comb_count = 0; | |
1054 | if (isec->reloc_count) | |
1055 | { | |
1056 | unsigned n; | |
1057 | ||
1058 | /* Get a copy of the native relocations. */ | |
1059 | internal_relocs = _bfd_elf32_link_read_relocs ( | |
1060 | abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL, | |
1061 | link_info->keep_memory); | |
1062 | if (internal_relocs == NULL) | |
1063 | goto error_return; | |
1064 | if (! link_info->keep_memory) | |
1065 | free_relocs = internal_relocs; | |
1066 | ||
1067 | /* Setup a faster access method for the reloc info we need. */ | |
1068 | rela_comb = (Elf_Internal_Rela**) | |
1069 | bfd_malloc (isec->reloc_count*sizeof(Elf_Internal_Rela*)); | |
1070 | if (rela_comb == NULL) | |
1071 | goto error_return; | |
1072 | for (n=0; n<isec->reloc_count; ++n) | |
1073 | { | |
1074 | long r_type; | |
1075 | ||
1076 | r_type = ELF32_R_TYPE (internal_relocs[n].r_info); | |
1077 | if (r_type < 0 || r_type >= (int)R_PPC_max) | |
1078 | goto error_return; | |
1079 | ||
1080 | /* Prologue constants are sometimes present in the ".text" | |
1081 | sections and they can be identified by their associated relocation. | |
1082 | We don't want to process those words and some others which | |
1083 | can also be identified by their relocations. However, not all | |
1084 | conditional branches will have a relocation so we will | |
1085 | only ignore words that 1) have a reloc, and 2) the reloc | |
1086 | is not applicable to a conditional branch. | |
1087 | The array rela_comb is built here for use in the EOP scan loop. */ | |
1088 | switch (r_type) | |
1089 | { | |
1090 | case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */ | |
1091 | case R_PPC_REL14: /* relative cond. br. */ | |
1092 | case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */ | |
1093 | /* We should check the instruction. */ | |
1094 | break; | |
1095 | default: | |
1096 | /* The word is not a conditional branch - ignore it. */ | |
1097 | rela_comb[comb_count++] = &internal_relocs[n]; | |
1098 | break; | |
1099 | } | |
1100 | } | |
1101 | if (comb_count > 1) | |
1102 | qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela); | |
1103 | } | |
1104 | ||
1105 | /* Enumerate each EOP region that overlaps this section. */ | |
1106 | end_section = isec->vma + isec->_cooked_size; | |
1107 | dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1; | |
1108 | dot -= link_info->mpc860c0; | |
1109 | section_modified = false; | |
1110 | if (dot < isec->vma) /* Increment the start position if this section */ | |
1111 | dot = isec->vma; /* begins in the middle of its first EOP region. */ | |
1112 | for (; | |
1113 | dot < end_section; | |
1114 | dot += PAGESIZE, end_page += PAGESIZE) | |
1115 | { | |
1116 | ||
1117 | /* Check each word in this EOP region. */ | |
1118 | for (; dot < end_page; dot += 4) | |
1119 | { | |
1120 | bfd_vma isec_offset; | |
1121 | unsigned long insn; | |
1122 | boolean skip, modified; | |
1123 | ||
1124 | /* Don't process this word if there is a relocation for it and | |
1125 | the relocation indicates the word is not a conditional branch. */ | |
1126 | skip = false; | |
1127 | isec_offset = dot - isec->vma; | |
1128 | for (; comb_curr<comb_count; ++comb_curr) | |
1129 | { | |
1130 | bfd_vma r_offset; | |
1131 | ||
1132 | r_offset = rela_comb[comb_curr]->r_offset; | |
1133 | if (r_offset >= isec_offset) | |
1134 | { | |
1135 | if (r_offset == isec_offset) skip = true; | |
1136 | break; | |
1137 | } | |
1138 | } | |
1139 | if (skip) continue; | |
1140 | ||
1141 | /* Check the current word for a problematic conditional branch. */ | |
1142 | #define BO0(insn) ((insn) & 0x02000000) | |
1143 | #define BO2(insn) ((insn) & 0x00800000) | |
1144 | #define BO4(insn) ((insn) & 0x00200000) | |
1145 | insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset); | |
1146 | modified = false; | |
1147 | if ((insn & 0xFc000000) == 0x40000000) | |
1148 | { | |
1149 | /* Instruction is BCx */ | |
1150 | if ((!BO0(insn) || !BO2(insn)) && !BO4(insn)) | |
1151 | { | |
1152 | bfd_vma target; | |
1153 | /* This branch is predicted as "normal". | |
1154 | If this is a forward branch, it is problematic. */ | |
1155 | ||
1156 | target = insn & 0x0000Fffc; /*extract*/ | |
1157 | target = (target ^ 0x8000) - 0x8000; /*sign extend*/ | |
1158 | if ((insn & 0x00000002) == 0) | |
1159 | target += dot; /*convert to abs*/ | |
1160 | if (target > dot) | |
1161 | { | |
1162 | insn |= 0x00200000; /* set the prediction bit */ | |
1163 | modified = true; | |
1164 | } | |
1165 | } | |
1166 | } | |
1167 | else if ((insn & 0xFc00Fffe) == 0x4c000420) | |
1168 | { | |
1169 | /* Instruction is BCCTRx */ | |
1170 | if ((!BO0(insn) || !BO2(insn)) && !BO4(insn)) | |
1171 | { | |
1172 | /* This branch is predicted as not-taken. | |
1173 | If this is a forward branch, it is problematic. | |
1174 | Since we can't tell statically if it will branch forward, | |
1175 | always set the prediction bit. */ | |
1176 | insn |= 0x00200000; /* set the prediction bit */ | |
1177 | modified = true; | |
1178 | } | |
1179 | } | |
1180 | else if ((insn & 0xFc00Fffe) == 0x4c000020) | |
1181 | { | |
1182 | /* Instruction is BCLRx */ | |
1183 | if ((!BO0(insn) || !BO2(insn)) && !BO4(insn)) | |
1184 | { | |
1185 | /* This branch is predicted as not-taken. | |
1186 | If this is a forward branch, it is problematic. | |
1187 | Since we can't tell statically if it will branch forward, | |
1188 | always set the prediction bit. */ | |
1189 | insn |= 0x00200000; /* set the prediction bit */ | |
1190 | modified = true; | |
1191 | } | |
1192 | } | |
1193 | #undef BO0 | |
1194 | #undef BO2 | |
1195 | #undef BO4 | |
1196 | if (modified) | |
1197 | { | |
1198 | bfd_put_32 (abfd, insn, contents + isec_offset); | |
1199 | section_modified = true; | |
1200 | } | |
1201 | } | |
1202 | } | |
1203 | if (section_modified) | |
1204 | { | |
1205 | elf_section_data (isec)->this_hdr.contents = contents; | |
1206 | free_contents = NULL; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | if (rela_comb != NULL) | |
1211 | { | |
1212 | free (rela_comb); | |
1213 | rela_comb = NULL; | |
1214 | } | |
1215 | ||
1216 | if (free_relocs != NULL) | |
1217 | { | |
1218 | free (free_relocs); | |
1219 | free_relocs = NULL; | |
1220 | } | |
1221 | ||
1222 | if (free_contents != NULL) | |
1223 | { | |
1224 | if (! link_info->keep_memory) | |
1225 | free (free_contents); | |
1226 | else | |
1227 | { | |
1228 | /* Cache the section contents for elf_link_input_bfd. */ | |
1229 | elf_section_data (isec)->this_hdr.contents = contents; | |
1230 | } | |
1231 | free_contents = NULL; | |
1232 | } | |
1233 | ||
1234 | return true; | |
1235 | ||
1236 | error_return: | |
1237 | if (rela_comb != NULL) | |
1238 | free (rela_comb); | |
1239 | if (free_relocs != NULL) | |
1240 | free (free_relocs); | |
1241 | if (free_contents != NULL) | |
1242 | free (free_contents); | |
1243 | return false; | |
1244 | } | |
1245 | ||
1246 | \f | |
1247 | static reloc_howto_type * | |
1248 | ppc_elf_reloc_type_lookup (abfd, code) | |
5f771d47 | 1249 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
1250 | bfd_reloc_code_real_type code; |
1251 | { | |
1252 | enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE; | |
1253 | ||
1254 | if (!ppc_elf_howto_table[R_PPC_ADDR32]) | |
1255 | /* Initialize howto table if needed */ | |
1256 | ppc_elf_howto_init (); | |
1257 | ||
1258 | switch ((int)code) | |
1259 | { | |
1260 | default: | |
1261 | return (reloc_howto_type *)NULL; | |
1262 | ||
1263 | case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break; | |
1264 | case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break; | |
1265 | case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break; | |
1266 | case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break; | |
1267 | case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break; | |
1268 | case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break; | |
1269 | case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break; | |
1270 | case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break; | |
1271 | case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break; | |
1272 | case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break; | |
1273 | case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break; | |
1274 | case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break; | |
1275 | case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break; | |
1276 | case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break; | |
1277 | case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break; | |
1278 | case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break; | |
1279 | case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break; | |
1280 | case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break; | |
1281 | case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break; | |
1282 | case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break; | |
1283 | case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break; | |
1284 | case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break; | |
1285 | case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break; | |
1286 | case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break; | |
1287 | case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break; | |
1288 | case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break; | |
1289 | case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break; | |
1290 | case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break; | |
1291 | case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break; | |
1292 | case BFD_RELOC_32_BASEREL: ppc_reloc = R_PPC_SECTOFF; break; | |
1293 | case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break; | |
1294 | case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break; | |
1295 | case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break; | |
1296 | case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break; | |
1297 | case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break; | |
1298 | case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break; | |
1299 | case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break; | |
1300 | case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break; | |
1301 | case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break; | |
1302 | case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break; | |
1303 | case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break; | |
1304 | case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break; | |
1305 | case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break; | |
1306 | case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break; | |
1307 | case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break; | |
1308 | case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break; | |
1309 | case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break; | |
1310 | case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break; | |
1311 | case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break; | |
1312 | case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break; | |
1313 | case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break; | |
1314 | case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break; | |
1315 | case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; break; | |
1316 | } | |
1317 | ||
1318 | return ppc_elf_howto_table[ (int)ppc_reloc ]; | |
1319 | }; | |
1320 | ||
1321 | /* Set the howto pointer for a PowerPC ELF reloc. */ | |
1322 | ||
1323 | static void | |
1324 | ppc_elf_info_to_howto (abfd, cache_ptr, dst) | |
5f771d47 | 1325 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
1326 | arelent *cache_ptr; |
1327 | Elf32_Internal_Rela *dst; | |
1328 | { | |
1329 | if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */ | |
1330 | ppc_elf_howto_init (); | |
1331 | ||
1332 | BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max); | |
1333 | cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)]; | |
1334 | } | |
1335 | ||
1336 | /* Handle the R_PPC_ADDR16_HA reloc. */ | |
1337 | ||
1338 | static bfd_reloc_status_type | |
1339 | ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section, | |
1340 | output_bfd, error_message) | |
5f771d47 | 1341 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
1342 | arelent *reloc_entry; |
1343 | asymbol *symbol; | |
5f771d47 | 1344 | PTR data ATTRIBUTE_UNUSED; |
252b5132 RH |
1345 | asection *input_section; |
1346 | bfd *output_bfd; | |
5f771d47 | 1347 | char **error_message ATTRIBUTE_UNUSED; |
252b5132 RH |
1348 | { |
1349 | bfd_vma relocation; | |
1350 | ||
1351 | if (output_bfd != NULL) | |
1352 | { | |
1353 | reloc_entry->address += input_section->output_offset; | |
1354 | return bfd_reloc_ok; | |
1355 | } | |
1356 | ||
1357 | if (reloc_entry->address > input_section->_cooked_size) | |
1358 | return bfd_reloc_outofrange; | |
1359 | ||
1360 | if (bfd_is_com_section (symbol->section)) | |
1361 | relocation = 0; | |
1362 | else | |
1363 | relocation = symbol->value; | |
1364 | ||
1365 | relocation += symbol->section->output_section->vma; | |
1366 | relocation += symbol->section->output_offset; | |
1367 | relocation += reloc_entry->addend; | |
1368 | ||
1369 | reloc_entry->addend += (relocation & 0x8000) << 1; | |
1370 | ||
1371 | return bfd_reloc_continue; | |
1372 | } | |
1373 | ||
1374 | /* Function to set whether a module needs the -mrelocatable bit set. */ | |
1375 | ||
1376 | static boolean | |
1377 | ppc_elf_set_private_flags (abfd, flags) | |
1378 | bfd *abfd; | |
1379 | flagword flags; | |
1380 | { | |
1381 | BFD_ASSERT (!elf_flags_init (abfd) | |
1382 | || elf_elfheader (abfd)->e_flags == flags); | |
1383 | ||
1384 | elf_elfheader (abfd)->e_flags = flags; | |
1385 | elf_flags_init (abfd) = true; | |
1386 | return true; | |
1387 | } | |
1388 | ||
1389 | /* Copy backend specific data from one object module to another */ | |
1390 | static boolean | |
1391 | ppc_elf_copy_private_bfd_data (ibfd, obfd) | |
1392 | bfd *ibfd; | |
1393 | bfd *obfd; | |
1394 | { | |
1395 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
1396 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
1397 | return true; | |
1398 | ||
1399 | BFD_ASSERT (!elf_flags_init (obfd) | |
1400 | || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); | |
1401 | ||
1402 | elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; | |
1403 | elf_flags_init (obfd) = true; | |
1404 | return true; | |
1405 | } | |
1406 | ||
1407 | /* Merge backend specific data from an object file to the output | |
1408 | object file when linking */ | |
1409 | static boolean | |
1410 | ppc_elf_merge_private_bfd_data (ibfd, obfd) | |
1411 | bfd *ibfd; | |
1412 | bfd *obfd; | |
1413 | { | |
1414 | flagword old_flags; | |
1415 | flagword new_flags; | |
1416 | boolean error; | |
1417 | ||
1418 | /* Check if we have the same endianess */ | |
1fe494a5 NC |
1419 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
1420 | return false; | |
252b5132 RH |
1421 | |
1422 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
1423 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
1424 | return true; | |
1425 | ||
1426 | new_flags = elf_elfheader (ibfd)->e_flags; | |
1427 | old_flags = elf_elfheader (obfd)->e_flags; | |
1428 | if (!elf_flags_init (obfd)) /* First call, no flags set */ | |
1429 | { | |
1430 | elf_flags_init (obfd) = true; | |
1431 | elf_elfheader (obfd)->e_flags = new_flags; | |
1432 | } | |
1433 | ||
1434 | else if (new_flags == old_flags) /* Compatible flags are ok */ | |
1435 | ; | |
1436 | ||
1437 | else /* Incompatible flags */ | |
1438 | { | |
1439 | /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked | |
1440 | with either. */ | |
1441 | error = false; | |
1442 | if ((new_flags & EF_PPC_RELOCATABLE) != 0 | |
1443 | && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0) | |
1444 | { | |
1445 | error = true; | |
1446 | (*_bfd_error_handler) | |
1447 | (_("%s: compiled with -mrelocatable and linked with modules compiled normally"), | |
1448 | bfd_get_filename (ibfd)); | |
1449 | } | |
1450 | else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0 | |
1451 | && (old_flags & EF_PPC_RELOCATABLE) != 0) | |
1452 | { | |
1453 | error = true; | |
1454 | (*_bfd_error_handler) | |
1455 | (_("%s: compiled normally and linked with modules compiled with -mrelocatable"), | |
1456 | bfd_get_filename (ibfd)); | |
1457 | } | |
1458 | ||
1459 | /* The output is -mrelocatable-lib iff both the input files are. */ | |
1460 | if (! (new_flags & EF_PPC_RELOCATABLE_LIB)) | |
1461 | elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB; | |
1462 | ||
1463 | /* The output is -mrelocatable iff it can't be -mrelocatable-lib, | |
1464 | but each input file is either -mrelocatable or -mrelocatable-lib. */ | |
1465 | if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB) | |
1466 | && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)) | |
1467 | && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))) | |
1468 | elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE; | |
1469 | ||
1470 | /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */ | |
1471 | elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB); | |
1472 | ||
1473 | new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB); | |
1474 | old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB); | |
1475 | ||
1476 | /* Warn about any other mismatches */ | |
1477 | if (new_flags != old_flags) | |
1478 | { | |
1479 | error = true; | |
1480 | (*_bfd_error_handler) | |
1481 | (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), | |
1482 | bfd_get_filename (ibfd), (long)new_flags, (long)old_flags); | |
1483 | } | |
1484 | ||
1485 | if (error) | |
1486 | { | |
1487 | bfd_set_error (bfd_error_bad_value); | |
1488 | return false; | |
1489 | } | |
1490 | } | |
1491 | ||
1492 | return true; | |
1493 | } | |
1494 | ||
1495 | \f | |
1496 | /* Handle a PowerPC specific section when reading an object file. This | |
1497 | is called when elfcode.h finds a section with an unknown type. */ | |
1498 | ||
1499 | static boolean | |
1500 | ppc_elf_section_from_shdr (abfd, hdr, name) | |
1501 | bfd *abfd; | |
1502 | Elf32_Internal_Shdr *hdr; | |
1503 | char *name; | |
1504 | { | |
1505 | asection *newsect; | |
1506 | flagword flags; | |
1507 | ||
1508 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name)) | |
1509 | return false; | |
1510 | ||
1511 | newsect = hdr->bfd_section; | |
1512 | flags = bfd_get_section_flags (abfd, newsect); | |
1513 | if (hdr->sh_flags & SHF_EXCLUDE) | |
1514 | flags |= SEC_EXCLUDE; | |
1515 | ||
1516 | if (hdr->sh_type == SHT_ORDERED) | |
1517 | flags |= SEC_SORT_ENTRIES; | |
1518 | ||
1519 | bfd_set_section_flags (abfd, newsect, flags); | |
1520 | return true; | |
1521 | } | |
1522 | ||
1523 | \f | |
1524 | /* Set up any other section flags and such that may be necessary. */ | |
1525 | ||
1526 | static boolean | |
1527 | ppc_elf_fake_sections (abfd, shdr, asect) | |
5f771d47 | 1528 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
1529 | Elf32_Internal_Shdr *shdr; |
1530 | asection *asect; | |
1531 | { | |
1532 | if ((asect->flags & SEC_EXCLUDE) != 0) | |
1533 | shdr->sh_flags |= SHF_EXCLUDE; | |
1534 | ||
1535 | if ((asect->flags & SEC_SORT_ENTRIES) != 0) | |
1536 | shdr->sh_type = SHT_ORDERED; | |
1537 | ||
1538 | return true; | |
1539 | } | |
1540 | ||
1541 | \f | |
1542 | /* Create a special linker section */ | |
1543 | static elf_linker_section_t * | |
1544 | ppc_elf_create_linker_section (abfd, info, which) | |
1545 | bfd *abfd; | |
1546 | struct bfd_link_info *info; | |
1547 | enum elf_linker_section_enum which; | |
1548 | { | |
1549 | bfd *dynobj = elf_hash_table (info)->dynobj; | |
1550 | elf_linker_section_t *lsect; | |
1551 | ||
1552 | /* Record the first bfd section that needs the special section */ | |
1553 | if (!dynobj) | |
1554 | dynobj = elf_hash_table (info)->dynobj = abfd; | |
1555 | ||
1556 | /* If this is the first time, create the section */ | |
1557 | lsect = elf_linker_section (dynobj, which); | |
1558 | if (!lsect) | |
1559 | { | |
1560 | elf_linker_section_t defaults; | |
1561 | static elf_linker_section_t zero_section; | |
1562 | ||
1563 | defaults = zero_section; | |
1564 | defaults.which = which; | |
1565 | defaults.hole_written_p = false; | |
1566 | defaults.alignment = 2; | |
1567 | ||
1568 | /* Both of these sections are (technically) created by the user | |
1569 | putting data in them, so they shouldn't be marked | |
1570 | SEC_LINKER_CREATED. | |
1571 | ||
1572 | The linker creates them so it has somewhere to attach their | |
1573 | respective symbols. In fact, if they were empty it would | |
1574 | be OK to leave the symbol set to 0 (or any random number), because | |
1575 | the appropriate register should never be used. */ | |
1576 | defaults.flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | |
1577 | | SEC_IN_MEMORY); | |
1578 | ||
1579 | switch (which) | |
1580 | { | |
1581 | default: | |
1582 | (*_bfd_error_handler) (_("%s: Unknown special linker type %d"), | |
1583 | bfd_get_filename (abfd), | |
1584 | (int)which); | |
1585 | ||
1586 | bfd_set_error (bfd_error_bad_value); | |
1587 | return (elf_linker_section_t *)0; | |
1588 | ||
1589 | case LINKER_SECTION_SDATA: /* .sdata/.sbss section */ | |
1590 | defaults.name = ".sdata"; | |
1591 | defaults.rel_name = ".rela.sdata"; | |
1592 | defaults.bss_name = ".sbss"; | |
1593 | defaults.sym_name = "_SDA_BASE_"; | |
1594 | defaults.sym_offset = 32768; | |
1595 | break; | |
1596 | ||
1597 | case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */ | |
1598 | defaults.name = ".sdata2"; | |
1599 | defaults.rel_name = ".rela.sdata2"; | |
1600 | defaults.bss_name = ".sbss2"; | |
1601 | defaults.sym_name = "_SDA2_BASE_"; | |
1602 | defaults.sym_offset = 32768; | |
1603 | defaults.flags |= SEC_READONLY; | |
1604 | break; | |
1605 | } | |
1606 | ||
1607 | lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults); | |
1608 | } | |
1609 | ||
1610 | return lsect; | |
1611 | } | |
1612 | ||
1613 | \f | |
1614 | /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we need to bump up | |
1615 | the number of section headers. */ | |
1616 | ||
1617 | static int | |
1618 | ppc_elf_additional_program_headers (abfd) | |
1619 | bfd *abfd; | |
1620 | { | |
1621 | asection *s; | |
1622 | int ret; | |
1623 | ||
1624 | ret = 0; | |
1625 | ||
1626 | s = bfd_get_section_by_name (abfd, ".interp"); | |
1627 | if (s != NULL) | |
1628 | ++ret; | |
1629 | ||
1630 | s = bfd_get_section_by_name (abfd, ".sbss2"); | |
1631 | if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0) | |
1632 | ++ret; | |
1633 | ||
1634 | s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0"); | |
1635 | if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0) | |
1636 | ++ret; | |
1637 | ||
1638 | return ret; | |
1639 | } | |
1640 | ||
1641 | /* Modify the segment map if needed */ | |
1642 | ||
1643 | static boolean | |
1644 | ppc_elf_modify_segment_map (abfd) | |
5f771d47 | 1645 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
1646 | { |
1647 | return true; | |
1648 | } | |
1649 | \f | |
1650 | /* We have to create .dynsbss and .rela.sbss here so that they get mapped | |
1651 | to output sections (just like _bfd_elf_create_dynamic_sections has | |
1652 | to create .dynbss and .rela.bss). */ | |
1653 | ||
1654 | static boolean | |
1655 | ppc_elf_create_dynamic_sections (abfd, info) | |
1656 | bfd *abfd; | |
1657 | struct bfd_link_info *info; | |
1658 | { | |
1659 | register asection *s; | |
1660 | flagword flags; | |
1661 | ||
1662 | if (!_bfd_elf_create_dynamic_sections(abfd, info)) | |
1663 | return false; | |
1664 | ||
1665 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
1666 | | SEC_LINKER_CREATED); | |
1667 | ||
1668 | s = bfd_make_section (abfd, ".dynsbss"); | |
1669 | if (s == NULL | |
1670 | || ! bfd_set_section_flags (abfd, s, SEC_ALLOC)) | |
1671 | return false; | |
1672 | ||
1673 | if (! info->shared) | |
1674 | { | |
1675 | s = bfd_make_section (abfd, ".rela.sbss"); | |
1676 | if (s == NULL | |
1677 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
1678 | || ! bfd_set_section_alignment (abfd, s, 2)) | |
1679 | return false; | |
1680 | } | |
1681 | return true; | |
1682 | } | |
1683 | ||
1684 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
1685 | regular object. The current definition is in some section of the | |
1686 | dynamic object, but we're not including those sections. We have to | |
1687 | change the definition to something the rest of the link can | |
1688 | understand. */ | |
1689 | ||
1690 | static boolean | |
1691 | ppc_elf_adjust_dynamic_symbol (info, h) | |
1692 | struct bfd_link_info *info; | |
1693 | struct elf_link_hash_entry *h; | |
1694 | { | |
1695 | bfd *dynobj = elf_hash_table (info)->dynobj; | |
1696 | asection *s; | |
1697 | unsigned int power_of_two; | |
1698 | bfd_vma plt_offset; | |
1699 | ||
1700 | #ifdef DEBUG | |
1701 | fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string); | |
1702 | #endif | |
1703 | ||
1704 | /* Make sure we know what is going on here. */ | |
1705 | BFD_ASSERT (dynobj != NULL | |
1706 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
1707 | || h->weakdef != NULL | |
1708 | || ((h->elf_link_hash_flags | |
1709 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1710 | && (h->elf_link_hash_flags | |
1711 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
1712 | && (h->elf_link_hash_flags | |
1713 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
1714 | ||
1715 | ||
1716 | /* If this is a function, put it in the procedure linkage table. We | |
1717 | will fill in the contents of the procedure linkage table later, | |
1718 | when we know the address of the .got section. */ | |
1719 | if (h->type == STT_FUNC | |
1720 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
1721 | { | |
1722 | if (! elf_hash_table (info)->dynamic_sections_created | |
e1e0340b | 1723 | || SYMBOL_CALLS_LOCAL (info, h) |
252b5132 RH |
1724 | || (info->shared && h->plt.refcount <= 0)) |
1725 | { | |
1726 | /* A PLT entry is not required/allowed when: | |
1727 | ||
1728 | 1. We are not using ld.so; because then the PLT entry | |
1729 | can't be set up, so we can't use one. | |
1730 | ||
e1e0340b GK |
1731 | 2. We know for certain that a call to this symbol |
1732 | will go to this object. | |
252b5132 RH |
1733 | |
1734 | 3. GC has rendered the entry unused. | |
1735 | Note, however, that in an executable all references to the | |
1736 | symbol go to the PLT, so we can't turn it off in that case. | |
1737 | ??? The correct thing to do here is to reference count | |
1738 | all uses of the symbol, not just those to the GOT or PLT. */ | |
1739 | h->plt.offset = (bfd_vma) -1; | |
1740 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
1741 | return true; | |
1742 | } | |
1743 | ||
1744 | /* Make sure this symbol is output as a dynamic symbol. */ | |
1745 | if (h->dynindx == -1) | |
1746 | { | |
1747 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
1748 | return false; | |
1749 | } | |
1750 | BFD_ASSERT (h->dynindx != -1); | |
1751 | ||
1752 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
1753 | BFD_ASSERT (s != NULL); | |
1754 | ||
1755 | /* If this is the first .plt entry, make room for the special | |
1756 | first entry. */ | |
1757 | if (s->_raw_size == 0) | |
1758 | s->_raw_size += PLT_INITIAL_ENTRY_SIZE; | |
1759 | ||
1760 | /* The PowerPC PLT is actually composed of two parts, the first part | |
1761 | is 2 words (for a load and a jump), and then there is a remaining | |
1762 | word available at the end. */ | |
1763 | plt_offset = (PLT_INITIAL_ENTRY_SIZE | |
1764 | + (PLT_SLOT_SIZE | |
1765 | * ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) | |
1766 | / PLT_ENTRY_SIZE))); | |
1767 | ||
1768 | /* If this symbol is not defined in a regular file, and we are | |
1769 | not generating a shared library, then set the symbol to this | |
1770 | location in the .plt. This is required to make function | |
1771 | pointers compare as equal between the normal executable and | |
1772 | the shared library. */ | |
1773 | if (! info->shared | |
1774 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1775 | { | |
1776 | h->root.u.def.section = s; | |
1777 | h->root.u.def.value = plt_offset; | |
1778 | } | |
1779 | ||
1780 | h->plt.offset = plt_offset; | |
1781 | ||
1782 | /* Make room for this entry. After the 8192nd entry, room | |
1783 | for two entries is allocated. */ | |
1784 | if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE | |
1785 | >= PLT_NUM_SINGLE_ENTRIES) | |
1786 | s->_raw_size += 2 * PLT_ENTRY_SIZE; | |
1787 | else | |
1788 | s->_raw_size += PLT_ENTRY_SIZE; | |
1789 | ||
1790 | /* We also need to make an entry in the .rela.plt section. */ | |
1791 | s = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
1792 | BFD_ASSERT (s != NULL); | |
1793 | s->_raw_size += sizeof (Elf32_External_Rela); | |
1794 | ||
1795 | return true; | |
1796 | } | |
1797 | ||
1798 | /* If this is a weak symbol, and there is a real definition, the | |
1799 | processor independent code will have arranged for us to see the | |
1800 | real definition first, and we can just use the same value. */ | |
1801 | if (h->weakdef != NULL) | |
1802 | { | |
1803 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
1804 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
1805 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
1806 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
1807 | return true; | |
1808 | } | |
1809 | ||
1810 | /* This is a reference to a symbol defined by a dynamic object which | |
1811 | is not a function. */ | |
1812 | ||
1813 | /* If we are creating a shared library, we must presume that the | |
1814 | only references to the symbol are via the global offset table. | |
1815 | For such cases we need not do anything here; the relocations will | |
1816 | be handled correctly by relocate_section. */ | |
1817 | if (info->shared) | |
1818 | return true; | |
1819 | ||
1820 | /* We must allocate the symbol in our .dynbss section, which will | |
1821 | become part of the .bss section of the executable. There will be | |
1822 | an entry for this symbol in the .dynsym section. The dynamic | |
1823 | object will contain position independent code, so all references | |
1824 | from the dynamic object to this symbol will go through the global | |
1825 | offset table. The dynamic linker will use the .dynsym entry to | |
1826 | determine the address it must put in the global offset table, so | |
1827 | both the dynamic object and the regular object will refer to the | |
1828 | same memory location for the variable. | |
1829 | ||
1830 | Of course, if the symbol is sufficiently small, we must instead | |
1831 | allocate it in .sbss. FIXME: It would be better to do this if and | |
1832 | only if there were actually SDAREL relocs for that symbol. */ | |
1833 | ||
1834 | if (h->size <= elf_gp_size (dynobj)) | |
1835 | s = bfd_get_section_by_name (dynobj, ".dynsbss"); | |
1836 | else | |
1837 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
1838 | BFD_ASSERT (s != NULL); | |
1839 | ||
1840 | /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to | |
1841 | copy the initial value out of the dynamic object and into the | |
1842 | runtime process image. We need to remember the offset into the | |
1843 | .rela.bss section we are going to use. */ | |
1844 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
1845 | { | |
1846 | asection *srel; | |
1847 | ||
1848 | if (h->size <= elf_gp_size (dynobj)) | |
1849 | srel = bfd_get_section_by_name (dynobj, ".rela.sbss"); | |
1850 | else | |
1851 | srel = bfd_get_section_by_name (dynobj, ".rela.bss"); | |
1852 | BFD_ASSERT (srel != NULL); | |
1853 | srel->_raw_size += sizeof (Elf32_External_Rela); | |
1854 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
1855 | } | |
1856 | ||
1857 | /* We need to figure out the alignment required for this symbol. I | |
1858 | have no idea how ELF linkers handle this. */ | |
1859 | power_of_two = bfd_log2 (h->size); | |
1860 | if (power_of_two > 4) | |
1861 | power_of_two = 4; | |
1862 | ||
1863 | /* Apply the required alignment. */ | |
1864 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
1865 | (bfd_size_type) (1 << power_of_two)); | |
1866 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
1867 | { | |
1868 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
1869 | return false; | |
1870 | } | |
1871 | ||
1872 | /* Define the symbol as being at this point in the section. */ | |
1873 | h->root.u.def.section = s; | |
1874 | h->root.u.def.value = s->_raw_size; | |
1875 | ||
1876 | /* Increment the section size to make room for the symbol. */ | |
1877 | s->_raw_size += h->size; | |
1878 | ||
1879 | return true; | |
1880 | } | |
1881 | ||
252b5132 RH |
1882 | \f |
1883 | /* Set the sizes of the dynamic sections. */ | |
1884 | ||
1885 | static boolean | |
1886 | ppc_elf_size_dynamic_sections (output_bfd, info) | |
1887 | bfd *output_bfd; | |
1888 | struct bfd_link_info *info; | |
1889 | { | |
1890 | bfd *dynobj; | |
1891 | asection *s; | |
1892 | boolean plt; | |
1893 | boolean relocs; | |
1894 | boolean reltext; | |
1895 | ||
1896 | #ifdef DEBUG | |
1897 | fprintf (stderr, "ppc_elf_size_dynamic_sections called\n"); | |
1898 | #endif | |
1899 | ||
1900 | dynobj = elf_hash_table (info)->dynobj; | |
1901 | BFD_ASSERT (dynobj != NULL); | |
1902 | ||
1903 | if (elf_hash_table (info)->dynamic_sections_created) | |
1904 | { | |
1905 | /* Set the contents of the .interp section to the interpreter. */ | |
1906 | if (! info->shared) | |
1907 | { | |
1908 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
1909 | BFD_ASSERT (s != NULL); | |
1910 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
1911 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
1912 | } | |
1913 | } | |
1914 | else | |
1915 | { | |
1916 | /* We may have created entries in the .rela.got, .rela.sdata, and | |
1917 | .rela.sdata2 sections. However, if we are not creating the | |
1918 | dynamic sections, we will not actually use these entries. Reset | |
1919 | the size of .rela.got, et al, which will cause it to get | |
1920 | stripped from the output file below. */ | |
1921 | static char *rela_sections[] = { ".rela.got", ".rela.sdata", | |
1922 | ".rela.sdata2", ".rela.sbss", | |
1923 | (char *)0 }; | |
1924 | char **p; | |
1925 | ||
1926 | for (p = rela_sections; *p != (char *)0; p++) | |
1927 | { | |
1928 | s = bfd_get_section_by_name (dynobj, *p); | |
1929 | if (s != NULL) | |
1930 | s->_raw_size = 0; | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
1935 | determined the sizes of the various dynamic sections. Allocate | |
1936 | memory for them. */ | |
1937 | plt = false; | |
1938 | relocs = false; | |
1939 | reltext = false; | |
1940 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1941 | { | |
1942 | const char *name; | |
1943 | boolean strip; | |
1944 | ||
1945 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1946 | continue; | |
1947 | ||
1948 | /* It's OK to base decisions on the section name, because none | |
1949 | of the dynobj section names depend upon the input files. */ | |
1950 | name = bfd_get_section_name (dynobj, s); | |
1951 | ||
1952 | strip = false; | |
1953 | ||
1954 | if (strcmp (name, ".plt") == 0) | |
1955 | { | |
1956 | if (s->_raw_size == 0) | |
1957 | { | |
1958 | /* Strip this section if we don't need it; see the | |
1959 | comment below. */ | |
1960 | strip = true; | |
1961 | } | |
1962 | else | |
1963 | { | |
1964 | /* Remember whether there is a PLT. */ | |
1965 | plt = true; | |
1966 | } | |
1967 | } | |
1968 | else if (strncmp (name, ".rela", 5) == 0) | |
1969 | { | |
1970 | if (s->_raw_size == 0) | |
1971 | { | |
1972 | /* If we don't need this section, strip it from the | |
1973 | output file. This is mostly to handle .rela.bss and | |
1974 | .rela.plt. We must create both sections in | |
1975 | create_dynamic_sections, because they must be created | |
1976 | before the linker maps input sections to output | |
1977 | sections. The linker does that before | |
1978 | adjust_dynamic_symbol is called, and it is that | |
1979 | function which decides whether anything needs to go | |
1980 | into these sections. */ | |
1981 | strip = true; | |
1982 | } | |
1983 | else | |
1984 | { | |
1985 | asection *target; | |
1986 | const char *outname; | |
1987 | ||
1988 | /* Remember whether there are any relocation sections. */ | |
1989 | relocs = true; | |
1990 | ||
1991 | /* If this relocation section applies to a read only | |
1992 | section, then we probably need a DT_TEXTREL entry. */ | |
1993 | outname = bfd_get_section_name (output_bfd, | |
1994 | s->output_section); | |
1995 | target = bfd_get_section_by_name (output_bfd, outname + 5); | |
1996 | if (target != NULL | |
1997 | && (target->flags & SEC_READONLY) != 0 | |
1998 | && (target->flags & SEC_ALLOC) != 0) | |
1999 | reltext = true; | |
2000 | ||
2001 | /* We use the reloc_count field as a counter if we need | |
2002 | to copy relocs into the output file. */ | |
2003 | s->reloc_count = 0; | |
2004 | } | |
2005 | } | |
2006 | else if (strcmp (name, ".got") != 0 | |
2007 | && strcmp (name, ".sdata") != 0 | |
2008 | && strcmp (name, ".sdata2") != 0) | |
2009 | { | |
2010 | /* It's not one of our sections, so don't allocate space. */ | |
2011 | continue; | |
2012 | } | |
2013 | ||
2014 | if (strip) | |
2015 | { | |
7f8d5fc9 | 2016 | _bfd_strip_section_from_output (info, s); |
252b5132 RH |
2017 | continue; |
2018 | } | |
2019 | ||
2020 | /* Allocate memory for the section contents. */ | |
2021 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); | |
2022 | if (s->contents == NULL && s->_raw_size != 0) | |
2023 | return false; | |
2024 | } | |
2025 | ||
2026 | if (elf_hash_table (info)->dynamic_sections_created) | |
2027 | { | |
2028 | /* Add some entries to the .dynamic section. We fill in the | |
2029 | values later, in ppc_elf_finish_dynamic_sections, but we | |
2030 | must add the entries now so that we get the correct size for | |
2031 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
2032 | dynamic linker and used by the debugger. */ | |
2033 | if (! info->shared) | |
2034 | { | |
2035 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
2036 | return false; | |
2037 | } | |
2038 | ||
2039 | if (plt) | |
2040 | { | |
2041 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
2042 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
2043 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) | |
2044 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
2045 | return false; | |
2046 | } | |
2047 | ||
2048 | if (relocs) | |
2049 | { | |
2050 | if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) | |
2051 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) | |
2052 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT, | |
2053 | sizeof (Elf32_External_Rela))) | |
2054 | return false; | |
2055 | } | |
2056 | ||
2057 | if (reltext) | |
2058 | { | |
2059 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
2060 | return false; | |
d6cf2879 | 2061 | info->flags |= DF_TEXTREL; |
252b5132 RH |
2062 | } |
2063 | } | |
2064 | ||
252b5132 RH |
2065 | return true; |
2066 | } | |
2067 | ||
2068 | \f | |
2069 | /* Look through the relocs for a section during the first phase, and | |
2070 | allocate space in the global offset table or procedure linkage | |
2071 | table. */ | |
2072 | ||
2073 | static boolean | |
2074 | ppc_elf_check_relocs (abfd, info, sec, relocs) | |
2075 | bfd *abfd; | |
2076 | struct bfd_link_info *info; | |
2077 | asection *sec; | |
2078 | const Elf_Internal_Rela *relocs; | |
2079 | { | |
2080 | bfd *dynobj; | |
2081 | Elf_Internal_Shdr *symtab_hdr; | |
2082 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; | |
2083 | const Elf_Internal_Rela *rel; | |
2084 | const Elf_Internal_Rela *rel_end; | |
2085 | bfd_signed_vma *local_got_refcounts; | |
2086 | elf_linker_section_t *sdata; | |
2087 | elf_linker_section_t *sdata2; | |
2088 | asection *sreloc; | |
2089 | asection *sgot = NULL; | |
2090 | asection *srelgot = NULL; | |
2091 | ||
2092 | if (info->relocateable) | |
2093 | return true; | |
2094 | ||
2095 | #ifdef DEBUG | |
2096 | fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n", | |
2097 | bfd_get_section_name (abfd, sec), | |
2098 | bfd_get_filename (abfd)); | |
2099 | #endif | |
2100 | ||
2101 | /* Create the linker generated sections all the time so that the | |
2102 | special symbols are created. */ | |
2103 | ||
2104 | if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL) | |
2105 | { | |
2106 | sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA); | |
2107 | if (!sdata) | |
2108 | return false; | |
2109 | } | |
2110 | ||
2111 | ||
2112 | if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL) | |
2113 | { | |
2114 | sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2); | |
2115 | if (!sdata2) | |
2116 | return false; | |
2117 | } | |
2118 | ||
2119 | dynobj = elf_hash_table (info)->dynobj; | |
2120 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
2121 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
2122 | ||
2123 | sym_hashes = elf_sym_hashes (abfd); | |
2124 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); | |
2125 | if (!elf_bad_symtab (abfd)) | |
2126 | sym_hashes_end -= symtab_hdr->sh_info; | |
2127 | ||
2128 | sreloc = NULL; | |
2129 | ||
2130 | rel_end = relocs + sec->reloc_count; | |
2131 | for (rel = relocs; rel < rel_end; rel++) | |
2132 | { | |
2133 | unsigned long r_symndx; | |
2134 | struct elf_link_hash_entry *h; | |
2135 | ||
2136 | r_symndx = ELF32_R_SYM (rel->r_info); | |
2137 | if (r_symndx < symtab_hdr->sh_info) | |
2138 | h = NULL; | |
2139 | else | |
2140 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
2141 | ||
2142 | /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got. | |
2143 | This shows up in particular in an R_PPC_ADDR32 in the eabi | |
2144 | startup code. */ | |
2145 | if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
2146 | { | |
2147 | if (sgot == NULL) | |
2148 | { | |
2149 | if (dynobj == NULL) | |
2150 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2151 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
2152 | return false; | |
2153 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2154 | BFD_ASSERT (sgot != NULL); | |
2155 | } | |
2156 | } | |
2157 | ||
2158 | switch (ELF32_R_TYPE (rel->r_info)) | |
2159 | { | |
2160 | /* GOT16 relocations */ | |
2161 | case R_PPC_GOT16: | |
2162 | case R_PPC_GOT16_LO: | |
2163 | case R_PPC_GOT16_HI: | |
2164 | case R_PPC_GOT16_HA: | |
2165 | /* This symbol requires a global offset table entry. */ | |
2166 | ||
2167 | if (sgot == NULL) | |
2168 | { | |
2169 | if (dynobj == NULL) | |
2170 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
2171 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
2172 | return false; | |
2173 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2174 | BFD_ASSERT (sgot != NULL); | |
2175 | } | |
2176 | ||
2177 | if (srelgot == NULL | |
2178 | && (h != NULL || info->shared)) | |
2179 | { | |
2180 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
2181 | if (srelgot == NULL) | |
2182 | { | |
2183 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
2184 | if (srelgot == NULL | |
2185 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2186 | (SEC_ALLOC | |
2187 | | SEC_LOAD | |
2188 | | SEC_HAS_CONTENTS | |
2189 | | SEC_IN_MEMORY | |
2190 | | SEC_LINKER_CREATED | |
2191 | | SEC_READONLY)) | |
2192 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2193 | return false; | |
2194 | } | |
2195 | } | |
2196 | ||
2197 | if (h != NULL) | |
2198 | { | |
2199 | if (h->got.refcount == -1) | |
2200 | { | |
2201 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2202 | if (h->dynindx == -1) | |
2203 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2204 | return false; | |
2205 | ||
2206 | /* Allocate space in the .got. */ | |
2207 | sgot->_raw_size += 4; | |
2208 | /* Allocate relocation space. */ | |
2209 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
2210 | ||
2211 | h->got.refcount = 1; | |
2212 | } | |
2213 | else | |
2214 | h->got.refcount++; | |
2215 | } | |
2216 | else | |
2217 | { | |
2218 | /* This is a global offset table entry for a local symbol. */ | |
2219 | if (local_got_refcounts == NULL) | |
2220 | { | |
2221 | size_t size; | |
2222 | ||
2223 | size = symtab_hdr->sh_info * sizeof (bfd_signed_vma); | |
2224 | local_got_refcounts = (bfd_signed_vma *) | |
2225 | bfd_alloc (abfd, size); | |
2226 | if (local_got_refcounts == NULL) | |
2227 | return false; | |
2228 | elf_local_got_refcounts (abfd) = local_got_refcounts; | |
2229 | memset (local_got_refcounts, -1, size); | |
2230 | } | |
2231 | if (local_got_refcounts[r_symndx] == -1) | |
2232 | { | |
2233 | sgot->_raw_size += 4; | |
2234 | ||
2235 | /* If we are generating a shared object, we need to | |
2236 | output a R_PPC_RELATIVE reloc so that the | |
2237 | dynamic linker can adjust this GOT entry. */ | |
2238 | if (info->shared) | |
2239 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
2240 | ||
2241 | local_got_refcounts[r_symndx] = 1; | |
2242 | } | |
2243 | else | |
2244 | local_got_refcounts[r_symndx]++; | |
2245 | } | |
2246 | break; | |
2247 | ||
2248 | /* Indirect .sdata relocation */ | |
2249 | case R_PPC_EMB_SDAI16: | |
2250 | if (info->shared) | |
2251 | { | |
2252 | ((*_bfd_error_handler) | |
2253 | (_("%s: relocation %s cannot be used when making a shared object"), | |
2254 | bfd_get_filename (abfd), "R_PPC_EMB_SDAI16")); | |
2255 | return false; | |
2256 | } | |
2257 | ||
2258 | if (srelgot == NULL && (h != NULL || info->shared)) | |
2259 | { | |
2260 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
2261 | if (srelgot == NULL) | |
2262 | { | |
2263 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
2264 | if (srelgot == NULL | |
2265 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2266 | (SEC_ALLOC | |
2267 | | SEC_LOAD | |
2268 | | SEC_HAS_CONTENTS | |
2269 | | SEC_IN_MEMORY | |
2270 | | SEC_LINKER_CREATED | |
2271 | | SEC_READONLY)) | |
2272 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2273 | return false; | |
2274 | } | |
2275 | } | |
2276 | ||
2277 | if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel)) | |
2278 | return false; | |
2279 | ||
2280 | break; | |
2281 | ||
2282 | /* Indirect .sdata2 relocation */ | |
2283 | case R_PPC_EMB_SDA2I16: | |
2284 | if (info->shared) | |
2285 | { | |
2286 | ((*_bfd_error_handler) | |
2287 | (_("%s: relocation %s cannot be used when making a shared object"), | |
2288 | bfd_get_filename (abfd), "R_PPC_EMB_SDA2I16")); | |
2289 | return false; | |
2290 | } | |
2291 | ||
2292 | if (srelgot == NULL && (h != NULL || info->shared)) | |
2293 | { | |
2294 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
2295 | if (srelgot == NULL) | |
2296 | { | |
2297 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
2298 | if (srelgot == NULL | |
2299 | || ! bfd_set_section_flags (dynobj, srelgot, | |
2300 | (SEC_ALLOC | |
2301 | | SEC_LOAD | |
2302 | | SEC_HAS_CONTENTS | |
2303 | | SEC_IN_MEMORY | |
2304 | | SEC_LINKER_CREATED | |
2305 | | SEC_READONLY)) | |
2306 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
2307 | return false; | |
2308 | } | |
2309 | } | |
2310 | ||
2311 | if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel)) | |
2312 | return false; | |
2313 | ||
2314 | break; | |
2315 | ||
2316 | case R_PPC_SDAREL16: | |
2317 | case R_PPC_EMB_SDA2REL: | |
2318 | case R_PPC_EMB_SDA21: | |
2319 | if (info->shared) | |
2320 | { | |
2321 | ((*_bfd_error_handler) | |
2322 | (_("%s: relocation %s cannot be used when making a shared object"), | |
2323 | bfd_get_filename (abfd), | |
2324 | ppc_elf_howto_table[(int)ELF32_R_TYPE (rel->r_info)]->name)); | |
2325 | return false; | |
2326 | } | |
2327 | break; | |
2328 | ||
2329 | case R_PPC_PLT32: | |
2330 | case R_PPC_PLTREL24: | |
2331 | case R_PPC_PLT16_LO: | |
2332 | case R_PPC_PLT16_HI: | |
2333 | case R_PPC_PLT16_HA: | |
2334 | #ifdef DEBUG | |
2335 | fprintf (stderr, "Reloc requires a PLT entry\n"); | |
2336 | #endif | |
2337 | /* This symbol requires a procedure linkage table entry. We | |
2338 | actually build the entry in adjust_dynamic_symbol, | |
2339 | because this might be a case of linking PIC code without | |
2340 | linking in any dynamic objects, in which case we don't | |
2341 | need to generate a procedure linkage table after all. */ | |
2342 | ||
2343 | if (h == NULL) | |
2344 | { | |
2345 | /* It does not make sense to have a procedure linkage | |
2346 | table entry for a local symbol. */ | |
2347 | bfd_set_error (bfd_error_bad_value); | |
2348 | return false; | |
2349 | } | |
2350 | ||
2351 | /* Make sure this symbol is output as a dynamic symbol. */ | |
2352 | if (h->dynindx == -1) | |
2353 | { | |
2354 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
2355 | return false; | |
2356 | } | |
2357 | if (h->plt.refcount == -1) | |
2358 | { | |
2359 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2360 | h->plt.refcount = 1; | |
2361 | } | |
2362 | else | |
2363 | h->plt.refcount++; | |
2364 | break; | |
2365 | ||
2366 | /* The following relocations don't need to propagate the | |
2367 | relocation if linking a shared object since they are | |
2368 | section relative. */ | |
2369 | case R_PPC_SECTOFF: | |
2370 | case R_PPC_SECTOFF_LO: | |
2371 | case R_PPC_SECTOFF_HI: | |
2372 | case R_PPC_SECTOFF_HA: | |
2373 | break; | |
2374 | ||
2375 | /* This refers only to functions defined in the shared library */ | |
2376 | case R_PPC_LOCAL24PC: | |
2377 | break; | |
2378 | ||
2379 | /* This relocation describes the C++ object vtable hierarchy. | |
2380 | Reconstruct it for later use during GC. */ | |
2381 | case R_PPC_GNU_VTINHERIT: | |
2382 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
2383 | return false; | |
2384 | break; | |
2385 | ||
2386 | /* This relocation describes which C++ vtable entries are actually | |
2387 | used. Record for later use during GC. */ | |
2388 | case R_PPC_GNU_VTENTRY: | |
2389 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
2390 | return false; | |
2391 | break; | |
2392 | ||
2393 | /* When creating a shared object, we must copy these | |
2394 | relocs into the output file. We create a reloc | |
2395 | section in dynobj and make room for the reloc. */ | |
2396 | case R_PPC_REL24: | |
2397 | case R_PPC_REL14: | |
2398 | case R_PPC_REL14_BRTAKEN: | |
2399 | case R_PPC_REL14_BRNTAKEN: | |
2400 | case R_PPC_REL32: | |
2401 | if (h == NULL | |
e1e0340b GK |
2402 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 |
2403 | || SYMBOL_REFERENCES_LOCAL (info, h)) | |
252b5132 RH |
2404 | break; |
2405 | /* fall through */ | |
2406 | ||
2407 | default: | |
2408 | if (info->shared) | |
2409 | { | |
2410 | #ifdef DEBUG | |
2411 | fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n", | |
2412 | (h && h->root.root.string) ? h->root.root.string : "<unknown>"); | |
2413 | #endif | |
2414 | if (sreloc == NULL) | |
2415 | { | |
2416 | const char *name; | |
2417 | ||
2418 | name = (bfd_elf_string_from_elf_section | |
2419 | (abfd, | |
2420 | elf_elfheader (abfd)->e_shstrndx, | |
2421 | elf_section_data (sec)->rel_hdr.sh_name)); | |
2422 | if (name == NULL) | |
2423 | return false; | |
2424 | ||
2425 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
2426 | && strcmp (bfd_get_section_name (abfd, sec), | |
2427 | name + 5) == 0); | |
2428 | ||
2429 | sreloc = bfd_get_section_by_name (dynobj, name); | |
2430 | if (sreloc == NULL) | |
2431 | { | |
2432 | flagword flags; | |
2433 | ||
2434 | sreloc = bfd_make_section (dynobj, name); | |
2435 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
2436 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
2437 | if ((sec->flags & SEC_ALLOC) != 0) | |
2438 | flags |= SEC_ALLOC | SEC_LOAD; | |
2439 | if (sreloc == NULL | |
2440 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
2441 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
2442 | return false; | |
2443 | } | |
2444 | } | |
2445 | ||
2446 | sreloc->_raw_size += sizeof (Elf32_External_Rela); | |
2447 | ||
2448 | /* FIXME: We should here do what the m68k and i386 | |
2449 | backends do: if the reloc is pc-relative, record it | |
2450 | in case it turns out that the reloc is unnecessary | |
2451 | because the symbol is forced local by versioning or | |
2452 | we are linking with -Bdynamic. Fortunately this | |
2453 | case is not frequent. */ | |
2454 | } | |
2455 | ||
2456 | break; | |
2457 | } | |
2458 | } | |
2459 | ||
2460 | return true; | |
2461 | } | |
2462 | ||
2463 | /* Return the section that should be marked against GC for a given | |
2464 | relocation. */ | |
2465 | ||
2466 | static asection * | |
2467 | ppc_elf_gc_mark_hook (abfd, info, rel, h, sym) | |
2468 | bfd *abfd; | |
5f771d47 | 2469 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
2470 | Elf_Internal_Rela *rel; |
2471 | struct elf_link_hash_entry *h; | |
2472 | Elf_Internal_Sym *sym; | |
2473 | { | |
2474 | if (h != NULL) | |
2475 | { | |
2476 | switch (ELF32_R_TYPE (rel->r_info)) | |
2477 | { | |
2478 | case R_PPC_GNU_VTINHERIT: | |
2479 | case R_PPC_GNU_VTENTRY: | |
2480 | break; | |
2481 | ||
2482 | default: | |
2483 | switch (h->root.type) | |
2484 | { | |
2485 | case bfd_link_hash_defined: | |
2486 | case bfd_link_hash_defweak: | |
2487 | return h->root.u.def.section; | |
2488 | ||
2489 | case bfd_link_hash_common: | |
2490 | return h->root.u.c.p->section; | |
2491 | ||
2492 | default: | |
2493 | break; | |
2494 | } | |
2495 | } | |
2496 | } | |
2497 | else | |
2498 | { | |
2499 | if (!(elf_bad_symtab (abfd) | |
2500 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
2501 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
2502 | && sym->st_shndx != SHN_COMMON)) | |
2503 | { | |
2504 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
2505 | } | |
2506 | } | |
2507 | ||
2508 | return NULL; | |
2509 | } | |
2510 | ||
2511 | /* Update the got entry reference counts for the section being removed. */ | |
2512 | ||
2513 | static boolean | |
2514 | ppc_elf_gc_sweep_hook (abfd, info, sec, relocs) | |
2515 | bfd *abfd; | |
5f771d47 | 2516 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
2517 | asection *sec; |
2518 | const Elf_Internal_Rela *relocs; | |
2519 | { | |
2520 | Elf_Internal_Shdr *symtab_hdr; | |
2521 | struct elf_link_hash_entry **sym_hashes; | |
2522 | bfd_signed_vma *local_got_refcounts; | |
2523 | const Elf_Internal_Rela *rel, *relend; | |
2524 | unsigned long r_symndx; | |
2525 | struct elf_link_hash_entry *h; | |
2526 | ||
2527 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
2528 | sym_hashes = elf_sym_hashes (abfd); | |
2529 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
2530 | ||
2531 | relend = relocs + sec->reloc_count; | |
2532 | for (rel = relocs; rel < relend; rel++) | |
2533 | switch (ELF32_R_TYPE (rel->r_info)) | |
2534 | { | |
2535 | case R_PPC_GOT16: | |
2536 | case R_PPC_GOT16_LO: | |
2537 | case R_PPC_GOT16_HI: | |
2538 | case R_PPC_GOT16_HA: | |
2539 | r_symndx = ELF32_R_SYM (rel->r_info); | |
2540 | if (r_symndx >= symtab_hdr->sh_info) | |
2541 | { | |
2542 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
2543 | if (h->got.refcount > 0) | |
2544 | h->got.refcount--; | |
2545 | } | |
dd5724d5 | 2546 | else if (local_got_refcounts != NULL) |
252b5132 RH |
2547 | { |
2548 | if (local_got_refcounts[r_symndx] > 0) | |
2549 | local_got_refcounts[r_symndx]--; | |
2550 | } | |
2551 | break; | |
2552 | ||
2553 | case R_PPC_PLT32: | |
2554 | case R_PPC_PLTREL24: | |
2555 | case R_PPC_PLT16_LO: | |
2556 | case R_PPC_PLT16_HI: | |
2557 | case R_PPC_PLT16_HA: | |
2558 | r_symndx = ELF32_R_SYM (rel->r_info); | |
2559 | if (r_symndx >= symtab_hdr->sh_info) | |
2560 | { | |
2561 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
2562 | if (h->plt.refcount > 0) | |
2563 | h->plt.refcount--; | |
2564 | } | |
2565 | break; | |
2566 | ||
2567 | default: | |
2568 | break; | |
2569 | } | |
2570 | ||
2571 | return true; | |
2572 | } | |
2573 | \f | |
2574 | /* Hook called by the linker routine which adds symbols from an object | |
2575 | file. We use it to put .comm items in .sbss, and not .bss. */ | |
2576 | ||
2577 | /*ARGSUSED*/ | |
2578 | static boolean | |
2579 | ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) | |
2580 | bfd *abfd; | |
2581 | struct bfd_link_info *info; | |
2582 | const Elf_Internal_Sym *sym; | |
5f771d47 ILT |
2583 | const char **namep ATTRIBUTE_UNUSED; |
2584 | flagword *flagsp ATTRIBUTE_UNUSED; | |
252b5132 RH |
2585 | asection **secp; |
2586 | bfd_vma *valp; | |
2587 | { | |
2588 | if (sym->st_shndx == SHN_COMMON | |
2589 | && !info->relocateable | |
2590 | && sym->st_size <= (bfd_vma) bfd_get_gp_size (abfd)) | |
2591 | { | |
2592 | /* Common symbols less than or equal to -G nn bytes are automatically | |
2593 | put into .sdata. */ | |
2594 | elf_linker_section_t *sdata | |
2595 | = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA); | |
2596 | ||
2597 | if (!sdata->bss_section) | |
2598 | { | |
2599 | /* We don't go through bfd_make_section, because we don't | |
2600 | want to attach this common section to DYNOBJ. The linker | |
2601 | will move the symbols to the appropriate output section | |
2602 | when it defines common symbols. */ | |
2603 | sdata->bss_section = ((asection *) | |
2604 | bfd_zalloc (abfd, sizeof (asection))); | |
2605 | if (sdata->bss_section == NULL) | |
2606 | return false; | |
2607 | sdata->bss_section->name = sdata->bss_name; | |
2608 | sdata->bss_section->flags = SEC_IS_COMMON; | |
2609 | sdata->bss_section->output_section = sdata->bss_section; | |
2610 | sdata->bss_section->symbol = | |
2611 | (asymbol *) bfd_zalloc (abfd, sizeof (asymbol)); | |
2612 | sdata->bss_section->symbol_ptr_ptr = | |
2613 | (asymbol **) bfd_zalloc (abfd, sizeof (asymbol *)); | |
2614 | if (sdata->bss_section->symbol == NULL | |
2615 | || sdata->bss_section->symbol_ptr_ptr == NULL) | |
2616 | return false; | |
2617 | sdata->bss_section->symbol->name = sdata->bss_name; | |
2618 | sdata->bss_section->symbol->flags = BSF_SECTION_SYM; | |
2619 | sdata->bss_section->symbol->section = sdata->bss_section; | |
2620 | *sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol; | |
2621 | } | |
2622 | ||
2623 | *secp = sdata->bss_section; | |
2624 | *valp = sym->st_size; | |
2625 | } | |
2626 | ||
2627 | return true; | |
2628 | } | |
2629 | ||
2630 | \f | |
2631 | /* Finish up dynamic symbol handling. We set the contents of various | |
2632 | dynamic sections here. */ | |
2633 | ||
2634 | static boolean | |
2635 | ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym) | |
2636 | bfd *output_bfd; | |
2637 | struct bfd_link_info *info; | |
2638 | struct elf_link_hash_entry *h; | |
2639 | Elf_Internal_Sym *sym; | |
2640 | { | |
2641 | bfd *dynobj; | |
2642 | ||
2643 | #ifdef DEBUG | |
2644 | fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s", | |
2645 | h->root.root.string); | |
2646 | #endif | |
2647 | ||
2648 | dynobj = elf_hash_table (info)->dynobj; | |
2649 | BFD_ASSERT (dynobj != NULL); | |
2650 | ||
2651 | if (h->plt.offset != (bfd_vma) -1) | |
2652 | { | |
2653 | asection *splt; | |
2654 | asection *srela; | |
2655 | Elf_Internal_Rela rela; | |
2656 | bfd_vma reloc_index; | |
2657 | ||
2658 | #ifdef DEBUG | |
2659 | fprintf (stderr, ", plt_offset = %d", h->plt.offset); | |
2660 | #endif | |
2661 | ||
2662 | /* This symbol has an entry in the procedure linkage table. Set | |
2663 | it up. */ | |
2664 | ||
2665 | BFD_ASSERT (h->dynindx != -1); | |
2666 | ||
2667 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
2668 | srela = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
2669 | BFD_ASSERT (splt != NULL && srela != NULL); | |
2670 | ||
2671 | /* We don't need to fill in the .plt. The ppc dynamic linker | |
2672 | will fill it in. */ | |
2673 | ||
2674 | /* Fill in the entry in the .rela.plt section. */ | |
2675 | rela.r_offset = (splt->output_section->vma | |
2676 | + splt->output_offset | |
2677 | + h->plt.offset); | |
2678 | rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT); | |
2679 | rela.r_addend = 0; | |
2680 | ||
2681 | reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE; | |
2682 | if (reloc_index > PLT_NUM_SINGLE_ENTRIES) | |
2683 | reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2; | |
2684 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
2685 | ((Elf32_External_Rela *) srela->contents | |
2686 | + reloc_index)); | |
2687 | ||
2688 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2689 | { | |
2690 | /* Mark the symbol as undefined, rather than as defined in | |
2691 | the .plt section. Leave the value alone. */ | |
2692 | sym->st_shndx = SHN_UNDEF; | |
a4b120e1 GK |
2693 | /* If the symbol is weak, we do need to clear the value. |
2694 | Otherwise, the PLT entry would provide a definition for | |
2695 | the symbol even if the symbol wasn't defined anywhere, | |
2696 | and so the symbol would never be NULL. */ | |
2697 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) | |
2698 | == 0) | |
2699 | sym->st_value = 0; | |
252b5132 RH |
2700 | } |
2701 | } | |
2702 | ||
2703 | if (h->got.offset != (bfd_vma) -1) | |
2704 | { | |
2705 | asection *sgot; | |
2706 | asection *srela; | |
2707 | Elf_Internal_Rela rela; | |
2708 | ||
2709 | /* This symbol has an entry in the global offset table. Set it | |
2710 | up. */ | |
2711 | ||
2712 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2713 | srela = bfd_get_section_by_name (dynobj, ".rela.got"); | |
2714 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
2715 | ||
2716 | rela.r_offset = (sgot->output_section->vma | |
2717 | + sgot->output_offset | |
2718 | + (h->got.offset &~ 1)); | |
2719 | ||
2720 | /* If this is a -Bsymbolic link, and the symbol is defined | |
2721 | locally, we just want to emit a RELATIVE reloc. The entry in | |
2722 | the global offset table will already have been initialized in | |
2723 | the relocate_section function. */ | |
2724 | if (info->shared | |
e1e0340b | 2725 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
252b5132 RH |
2726 | { |
2727 | rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE); | |
2728 | rela.r_addend = (h->root.u.def.value | |
2729 | + h->root.u.def.section->output_section->vma | |
2730 | + h->root.u.def.section->output_offset); | |
2731 | } | |
2732 | else | |
2733 | { | |
2734 | BFD_ASSERT((h->got.offset & 1) == 0); | |
2735 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
2736 | rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT); | |
2737 | rela.r_addend = 0; | |
2738 | } | |
2739 | ||
2740 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
2741 | ((Elf32_External_Rela *) srela->contents | |
2742 | + srela->reloc_count)); | |
2743 | ++srela->reloc_count; | |
2744 | } | |
2745 | ||
2746 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
2747 | { | |
2748 | asection *s; | |
2749 | Elf_Internal_Rela rela; | |
2750 | ||
2751 | /* This symbols needs a copy reloc. Set it up. */ | |
2752 | ||
2753 | #ifdef DEBUG | |
2754 | fprintf (stderr, ", copy"); | |
2755 | #endif | |
2756 | ||
2757 | BFD_ASSERT (h->dynindx != -1); | |
2758 | ||
2759 | if (h->size <= elf_gp_size (dynobj)) | |
2760 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
2761 | ".rela.sbss"); | |
2762 | else | |
2763 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
2764 | ".rela.bss"); | |
2765 | BFD_ASSERT (s != NULL); | |
2766 | ||
2767 | rela.r_offset = (h->root.u.def.value | |
2768 | + h->root.u.def.section->output_section->vma | |
2769 | + h->root.u.def.section->output_offset); | |
2770 | rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY); | |
2771 | rela.r_addend = 0; | |
2772 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
2773 | ((Elf32_External_Rela *) s->contents | |
2774 | + s->reloc_count)); | |
2775 | ++s->reloc_count; | |
2776 | } | |
2777 | ||
2778 | #ifdef DEBUG | |
2779 | fprintf (stderr, "\n"); | |
2780 | #endif | |
2781 | ||
2782 | /* Mark some specially defined symbols as absolute. */ | |
2783 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
2784 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 | |
2785 | || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0) | |
2786 | sym->st_shndx = SHN_ABS; | |
2787 | ||
2788 | return true; | |
2789 | } | |
2790 | ||
2791 | \f | |
2792 | /* Finish up the dynamic sections. */ | |
2793 | ||
2794 | static boolean | |
2795 | ppc_elf_finish_dynamic_sections (output_bfd, info) | |
2796 | bfd *output_bfd; | |
2797 | struct bfd_link_info *info; | |
2798 | { | |
2799 | asection *sdyn; | |
2800 | bfd *dynobj = elf_hash_table (info)->dynobj; | |
2801 | asection *sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2802 | ||
2803 | #ifdef DEBUG | |
2804 | fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n"); | |
2805 | #endif | |
2806 | ||
2807 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
2808 | ||
2809 | if (elf_hash_table (info)->dynamic_sections_created) | |
2810 | { | |
2811 | asection *splt; | |
2812 | Elf32_External_Dyn *dyncon, *dynconend; | |
2813 | ||
2814 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
2815 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
2816 | ||
2817 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
2818 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
2819 | for (; dyncon < dynconend; dyncon++) | |
2820 | { | |
2821 | Elf_Internal_Dyn dyn; | |
2822 | const char *name; | |
2823 | boolean size; | |
2824 | ||
2825 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
2826 | ||
2827 | switch (dyn.d_tag) | |
2828 | { | |
2829 | case DT_PLTGOT: name = ".plt"; size = false; break; | |
2830 | case DT_PLTRELSZ: name = ".rela.plt"; size = true; break; | |
2831 | case DT_JMPREL: name = ".rela.plt"; size = false; break; | |
2832 | default: name = NULL; size = false; break; | |
2833 | } | |
2834 | ||
2835 | if (name != NULL) | |
2836 | { | |
2837 | asection *s; | |
2838 | ||
2839 | s = bfd_get_section_by_name (output_bfd, name); | |
2840 | if (s == NULL) | |
2841 | dyn.d_un.d_val = 0; | |
2842 | else | |
2843 | { | |
2844 | if (! size) | |
2845 | dyn.d_un.d_ptr = s->vma; | |
2846 | else | |
2847 | { | |
2848 | if (s->_cooked_size != 0) | |
2849 | dyn.d_un.d_val = s->_cooked_size; | |
2850 | else | |
2851 | dyn.d_un.d_val = s->_raw_size; | |
2852 | } | |
2853 | } | |
2854 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2855 | } | |
2856 | } | |
2857 | } | |
2858 | ||
2859 | /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can | |
2860 | easily find the address of the _GLOBAL_OFFSET_TABLE_. */ | |
2861 | if (sgot) | |
2862 | { | |
2863 | unsigned char *contents = sgot->contents; | |
2864 | bfd_put_32 (output_bfd, 0x4e800021 /* blrl */, contents); | |
2865 | ||
2866 | if (sdyn == NULL) | |
2867 | bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4); | |
2868 | else | |
2869 | bfd_put_32 (output_bfd, | |
2870 | sdyn->output_section->vma + sdyn->output_offset, | |
2871 | contents+4); | |
2872 | ||
2873 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
2874 | } | |
2875 | ||
252b5132 RH |
2876 | return true; |
2877 | } | |
2878 | ||
2879 | \f | |
2880 | /* The RELOCATE_SECTION function is called by the ELF backend linker | |
2881 | to handle the relocations for a section. | |
2882 | ||
2883 | The relocs are always passed as Rela structures; if the section | |
2884 | actually uses Rel structures, the r_addend field will always be | |
2885 | zero. | |
2886 | ||
2887 | This function is responsible for adjust the section contents as | |
2888 | necessary, and (if using Rela relocs and generating a | |
2889 | relocateable output file) adjusting the reloc addend as | |
2890 | necessary. | |
2891 | ||
2892 | This function does not have to worry about setting the reloc | |
2893 | address or the reloc symbol index. | |
2894 | ||
2895 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
2896 | ||
2897 | LOCAL_SECTIONS is an array giving the section in the input file | |
2898 | corresponding to the st_shndx field of each local symbol. | |
2899 | ||
2900 | The global hash table entry for the global symbols can be found | |
2901 | via elf_sym_hashes (input_bfd). | |
2902 | ||
2903 | When generating relocateable output, this function must handle | |
2904 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
2905 | going to be the section symbol corresponding to the output | |
2906 | section, which means that the addend must be adjusted | |
2907 | accordingly. */ | |
2908 | ||
2909 | static boolean | |
2910 | ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section, | |
2911 | contents, relocs, local_syms, local_sections) | |
2912 | bfd *output_bfd; | |
2913 | struct bfd_link_info *info; | |
2914 | bfd *input_bfd; | |
2915 | asection *input_section; | |
2916 | bfd_byte *contents; | |
2917 | Elf_Internal_Rela *relocs; | |
2918 | Elf_Internal_Sym *local_syms; | |
2919 | asection **local_sections; | |
2920 | { | |
2921 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2922 | struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); | |
2923 | bfd *dynobj = elf_hash_table (info)->dynobj; | |
2924 | elf_linker_section_t *sdata = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA) : NULL; | |
2925 | elf_linker_section_t *sdata2 = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA2) : NULL; | |
2926 | Elf_Internal_Rela *rel = relocs; | |
2927 | Elf_Internal_Rela *relend = relocs + input_section->reloc_count; | |
2928 | asection *sreloc = NULL; | |
2929 | asection *splt; | |
2930 | asection *sgot; | |
2931 | bfd_vma *local_got_offsets; | |
2932 | boolean ret = true; | |
2933 | long insn; | |
2934 | ||
2935 | #ifdef DEBUG | |
2936 | fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n", | |
2937 | bfd_get_filename (input_bfd), | |
2938 | bfd_section_name(input_bfd, input_section), | |
2939 | (long)input_section->reloc_count, | |
2940 | (info->relocateable) ? " (relocatable)" : ""); | |
2941 | #endif | |
2942 | ||
2943 | if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */ | |
2944 | ppc_elf_howto_init (); | |
2945 | ||
2946 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
2947 | ||
2948 | splt = sgot = NULL; | |
2949 | if (dynobj != NULL) | |
2950 | { | |
2951 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
2952 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
2953 | } | |
2954 | ||
2955 | for (; rel < relend; rel++) | |
2956 | { | |
2957 | enum elf_ppc_reloc_type r_type = (enum elf_ppc_reloc_type)ELF32_R_TYPE (rel->r_info); | |
2958 | bfd_vma offset = rel->r_offset; | |
2959 | bfd_vma addend = rel->r_addend; | |
2960 | bfd_reloc_status_type r = bfd_reloc_other; | |
2961 | Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0; | |
2962 | asection *sec = (asection *)0; | |
2963 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0; | |
2964 | const char *sym_name = (const char *)0; | |
2965 | reloc_howto_type *howto; | |
2966 | unsigned long r_symndx; | |
2967 | bfd_vma relocation; | |
e1e0340b | 2968 | int will_become_local; |
252b5132 RH |
2969 | |
2970 | /* Unknown relocation handling */ | |
2971 | if ((unsigned)r_type >= (unsigned)R_PPC_max || !ppc_elf_howto_table[(int)r_type]) | |
2972 | { | |
2973 | (*_bfd_error_handler) (_("%s: unknown relocation type %d"), | |
2974 | bfd_get_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 (info->relocateable) | |
2986 | { | |
2987 | /* This is a relocateable link. We don't have to change | |
2988 | anything, unless the reloc is against a section symbol, | |
2989 | in which case we have to adjust according to where the | |
2990 | section symbol winds up in the output section. */ | |
2991 | if (r_symndx < symtab_hdr->sh_info) | |
2992 | { | |
2993 | sym = local_syms + r_symndx; | |
2994 | if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
2995 | { | |
2996 | sec = local_sections[r_symndx]; | |
2997 | addend = rel->r_addend += sec->output_offset + sym->st_value; | |
2998 | } | |
2999 | } | |
3000 | ||
3001 | #ifdef DEBUG | |
3002 | fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", | |
3003 | howto->name, | |
3004 | (int)r_type, | |
3005 | r_symndx, | |
3006 | (long)offset, | |
3007 | (long)addend); | |
3008 | #endif | |
3009 | continue; | |
3010 | } | |
3011 | ||
3012 | /* This is a final link. */ | |
3013 | if (r_symndx < symtab_hdr->sh_info) | |
3014 | { | |
3015 | sym = local_syms + r_symndx; | |
3016 | sec = local_sections[r_symndx]; | |
3017 | sym_name = "<local symbol>"; | |
3018 | ||
3019 | relocation = (sec->output_section->vma | |
3020 | + sec->output_offset | |
3021 | + sym->st_value); | |
e1e0340b GK |
3022 | /* Relocs to local symbols are always resolved. */ |
3023 | will_become_local = 1; | |
252b5132 RH |
3024 | } |
3025 | else | |
3026 | { | |
3027 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
3028 | while (h->root.type == bfd_link_hash_indirect | |
3029 | || h->root.type == bfd_link_hash_warning) | |
3030 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
3031 | sym_name = h->root.root.string; | |
e1e0340b GK |
3032 | |
3033 | /* Can this relocation be resolved immediately? */ | |
3034 | will_become_local = SYMBOL_REFERENCES_LOCAL (info, h); | |
3035 | ||
252b5132 RH |
3036 | if (h->root.type == bfd_link_hash_defined |
3037 | || h->root.type == bfd_link_hash_defweak) | |
3038 | { | |
3039 | sec = h->root.u.def.section; | |
e1e0340b GK |
3040 | if (((r_type == R_PPC_PLT32 |
3041 | || r_type == R_PPC_PLTREL24) | |
dd5724d5 | 3042 | && splt != NULL |
252b5132 RH |
3043 | && h->plt.offset != (bfd_vma) -1) |
3044 | || (r_type == R_PPC_LOCAL24PC | |
3045 | && sec->output_section == NULL) | |
3046 | || ((r_type == R_PPC_GOT16 | |
3047 | || r_type == R_PPC_GOT16_LO | |
3048 | || r_type == R_PPC_GOT16_HI | |
3049 | || r_type == R_PPC_GOT16_HA) | |
3050 | && elf_hash_table (info)->dynamic_sections_created | |
e1e0340b | 3051 | && (! info->shared || ! will_become_local)) |
252b5132 | 3052 | || (info->shared |
e1e0340b | 3053 | && ! will_become_local |
2d146250 ILT |
3054 | && ((input_section->flags & SEC_ALLOC) != 0 |
3055 | /* Testing SEC_DEBUGGING here may be wrong. | |
3056 | It's here to avoid a crash when | |
3057 | generating a shared library with DWARF | |
3058 | debugging information. */ | |
1319985e AM |
3059 | || ((input_section->flags & SEC_DEBUGGING) != 0 |
3060 | && (h->elf_link_hash_flags | |
3061 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) | |
252b5132 RH |
3062 | && (r_type == R_PPC_ADDR32 |
3063 | || r_type == R_PPC_ADDR24 | |
3064 | || r_type == R_PPC_ADDR16 | |
3065 | || r_type == R_PPC_ADDR16_LO | |
3066 | || r_type == R_PPC_ADDR16_HI | |
3067 | || r_type == R_PPC_ADDR16_HA | |
3068 | || r_type == R_PPC_ADDR14 | |
3069 | || r_type == R_PPC_ADDR14_BRTAKEN | |
3070 | || r_type == R_PPC_ADDR14_BRNTAKEN | |
252b5132 RH |
3071 | || r_type == R_PPC_COPY |
3072 | || r_type == R_PPC_GLOB_DAT | |
3073 | || r_type == R_PPC_JMP_SLOT | |
3074 | || r_type == R_PPC_UADDR32 | |
3075 | || r_type == R_PPC_UADDR16 | |
3076 | || r_type == R_PPC_SDAREL16 | |
3077 | || r_type == R_PPC_EMB_NADDR32 | |
3078 | || r_type == R_PPC_EMB_NADDR16 | |
3079 | || r_type == R_PPC_EMB_NADDR16_LO | |
3080 | || r_type == R_PPC_EMB_NADDR16_HI | |
3081 | || r_type == R_PPC_EMB_NADDR16_HA | |
3082 | || r_type == R_PPC_EMB_SDAI16 | |
3083 | || r_type == R_PPC_EMB_SDA2I16 | |
3084 | || r_type == R_PPC_EMB_SDA2REL | |
3085 | || r_type == R_PPC_EMB_SDA21 | |
3086 | || r_type == R_PPC_EMB_MRKREF | |
3087 | || r_type == R_PPC_EMB_BIT_FLD | |
3088 | || r_type == R_PPC_EMB_RELSDA | |
3089 | || ((r_type == R_PPC_REL24 | |
3090 | || r_type == R_PPC_REL32 | |
3091 | || r_type == R_PPC_REL14 | |
3092 | || r_type == R_PPC_REL14_BRTAKEN | |
3093 | || r_type == R_PPC_REL14_BRNTAKEN | |
3094 | || r_type == R_PPC_RELATIVE) | |
3095 | && strcmp (h->root.root.string, | |
3096 | "_GLOBAL_OFFSET_TABLE_") != 0)))) | |
3097 | { | |
3098 | /* In these cases, we don't need the relocation | |
3099 | value. We check specially because in some | |
3100 | obscure cases sec->output_section will be NULL. */ | |
3101 | relocation = 0; | |
3102 | } | |
2d146250 ILT |
3103 | else if (sec->output_section == NULL) |
3104 | { | |
3105 | (*_bfd_error_handler) | |
3106 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
3107 | bfd_get_filename (input_bfd), h->root.root.string, | |
3108 | bfd_get_section_name (input_bfd, input_section)); | |
3109 | relocation = 0; | |
3110 | } | |
252b5132 RH |
3111 | else |
3112 | relocation = (h->root.u.def.value | |
3113 | + sec->output_section->vma | |
3114 | + sec->output_offset); | |
3115 | } | |
3116 | else if (h->root.type == bfd_link_hash_undefweak) | |
3117 | relocation = 0; | |
e1e0340b | 3118 | else if (info->shared && !info->symbolic && !info->no_undefined |
3a27a730 | 3119 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
252b5132 RH |
3120 | relocation = 0; |
3121 | else | |
3122 | { | |
464e1740 ILT |
3123 | if (! (*info->callbacks->undefined_symbol)(info, |
3124 | h->root.root.string, | |
3125 | input_bfd, | |
3126 | input_section, | |
5cc7c785 L |
3127 | rel->r_offset, |
3128 | (!info->shared | |
3a27a730 | 3129 | || info->no_undefined |
ba09750c | 3130 | || ELF_ST_VISIBILITY (h->other)))) |
464e1740 ILT |
3131 | return false; |
3132 | relocation = 0; | |
252b5132 RH |
3133 | } |
3134 | } | |
3135 | ||
3136 | switch ((int)r_type) | |
3137 | { | |
3138 | default: | |
3139 | (*_bfd_error_handler) (_("%s: unknown relocation type %d for symbol %s"), | |
3140 | bfd_get_filename (input_bfd), | |
3141 | (int)r_type, sym_name); | |
3142 | ||
3143 | bfd_set_error (bfd_error_bad_value); | |
3144 | ret = false; | |
3145 | continue; | |
3146 | ||
3147 | /* Relocations that need no special processing. */ | |
3148 | case (int)R_PPC_LOCAL24PC: | |
3149 | /* It makes no sense to point a local relocation | |
3150 | at a symbol not in this object. */ | |
3151 | if (h != NULL | |
3152 | && (h->root.type == bfd_link_hash_defined | |
3153 | || h->root.type == bfd_link_hash_defweak) | |
3154 | && sec->output_section == NULL) | |
3155 | { | |
464e1740 ILT |
3156 | if (! (*info->callbacks->undefined_symbol) (info, |
3157 | h->root.root.string, | |
3158 | input_bfd, | |
3159 | input_section, | |
5cc7c785 L |
3160 | rel->r_offset, |
3161 | true)) | |
464e1740 | 3162 | return false; |
252b5132 RH |
3163 | continue; |
3164 | } | |
3165 | break; | |
3166 | ||
3167 | /* Relocations that may need to be propagated if this is a shared | |
3168 | object. */ | |
3169 | case (int)R_PPC_REL24: | |
3170 | case (int)R_PPC_REL32: | |
3171 | case (int)R_PPC_REL14: | |
3172 | /* If these relocations are not to a named symbol, they can be | |
3173 | handled right here, no need to bother the dynamic linker. */ | |
3174 | if (h == NULL | |
e1e0340b GK |
3175 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 |
3176 | || SYMBOL_REFERENCES_LOCAL (info, h)) | |
252b5132 RH |
3177 | break; |
3178 | /* fall through */ | |
3179 | ||
3180 | /* Relocations that always need to be propagated if this is a shared | |
3181 | object. */ | |
3182 | case (int)R_PPC_NONE: | |
3183 | case (int)R_PPC_ADDR32: | |
3184 | case (int)R_PPC_ADDR24: | |
3185 | case (int)R_PPC_ADDR16: | |
3186 | case (int)R_PPC_ADDR16_LO: | |
3187 | case (int)R_PPC_ADDR16_HI: | |
3188 | case (int)R_PPC_ADDR16_HA: | |
3189 | case (int)R_PPC_ADDR14: | |
3190 | case (int)R_PPC_UADDR32: | |
3191 | case (int)R_PPC_UADDR16: | |
3192 | if (info->shared) | |
3193 | { | |
3194 | Elf_Internal_Rela outrel; | |
3195 | boolean skip; | |
3196 | ||
3197 | #ifdef DEBUG | |
3198 | fprintf (stderr, "ppc_elf_relocate_section need to create relocation for %s\n", | |
3199 | (h && h->root.root.string) ? h->root.root.string : "<unknown>"); | |
3200 | #endif | |
3201 | ||
3202 | /* When generating a shared object, these relocations | |
3203 | are copied into the output file to be resolved at run | |
3204 | time. */ | |
3205 | ||
3206 | if (sreloc == NULL) | |
3207 | { | |
3208 | const char *name; | |
3209 | ||
3210 | name = (bfd_elf_string_from_elf_section | |
3211 | (input_bfd, | |
3212 | elf_elfheader (input_bfd)->e_shstrndx, | |
3213 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
3214 | if (name == NULL) | |
3215 | return false; | |
3216 | ||
3217 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
3218 | && strcmp (bfd_get_section_name (input_bfd, | |
3219 | input_section), | |
3220 | name + 5) == 0); | |
3221 | ||
3222 | sreloc = bfd_get_section_by_name (dynobj, name); | |
3223 | BFD_ASSERT (sreloc != NULL); | |
3224 | } | |
3225 | ||
3226 | skip = false; | |
3227 | ||
3228 | if (elf_section_data (input_section)->stab_info == NULL) | |
3229 | outrel.r_offset = rel->r_offset; | |
3230 | else | |
3231 | { | |
3232 | bfd_vma off; | |
3233 | ||
3234 | off = (_bfd_stab_section_offset | |
3235 | (output_bfd, &elf_hash_table (info)->stab_info, | |
3236 | input_section, | |
3237 | &elf_section_data (input_section)->stab_info, | |
3238 | rel->r_offset)); | |
3239 | if (off == (bfd_vma) -1) | |
3240 | skip = true; | |
3241 | outrel.r_offset = off; | |
3242 | } | |
3243 | ||
3244 | outrel.r_offset += (input_section->output_section->vma | |
3245 | + input_section->output_offset); | |
3246 | ||
3247 | if (skip) | |
3248 | memset (&outrel, 0, sizeof outrel); | |
3249 | /* h->dynindx may be -1 if this symbol was marked to | |
3250 | become local. */ | |
e1e0340b | 3251 | else if (! will_become_local) |
252b5132 | 3252 | { |
252b5132 RH |
3253 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
3254 | outrel.r_addend = rel->r_addend; | |
3255 | } | |
3256 | else | |
3257 | { | |
3258 | if (r_type == R_PPC_ADDR32) | |
3259 | { | |
3260 | outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE); | |
3261 | outrel.r_addend = relocation + rel->r_addend; | |
3262 | } | |
3263 | else | |
3264 | { | |
3265 | long indx; | |
3266 | ||
3267 | if (h == NULL) | |
3268 | sec = local_sections[r_symndx]; | |
3269 | else | |
3270 | { | |
3271 | BFD_ASSERT (h->root.type == bfd_link_hash_defined | |
3272 | || (h->root.type | |
3273 | == bfd_link_hash_defweak)); | |
3274 | sec = h->root.u.def.section; | |
3275 | } | |
3276 | if (sec != NULL && bfd_is_abs_section (sec)) | |
3277 | indx = 0; | |
3278 | else if (sec == NULL || sec->owner == NULL) | |
3279 | { | |
3280 | bfd_set_error (bfd_error_bad_value); | |
3281 | return false; | |
3282 | } | |
3283 | else | |
3284 | { | |
3285 | asection *osec; | |
3286 | ||
3287 | osec = sec->output_section; | |
3288 | indx = elf_section_data (osec)->dynindx; | |
3289 | BFD_ASSERT(indx > 0); | |
3290 | #ifdef DEBUG | |
3291 | if (indx <= 0) | |
3292 | { | |
3293 | printf("indx=%d section=%s flags=%08x name=%s\n", | |
3294 | indx, osec->name, osec->flags, | |
3295 | h->root.root.string); | |
3296 | } | |
3297 | #endif | |
3298 | } | |
3299 | ||
3300 | outrel.r_info = ELF32_R_INFO (indx, r_type); | |
3301 | outrel.r_addend = relocation + rel->r_addend; | |
3302 | } | |
3303 | } | |
3304 | ||
3305 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
3306 | (((Elf32_External_Rela *) | |
3307 | sreloc->contents) | |
3308 | + sreloc->reloc_count)); | |
3309 | ++sreloc->reloc_count; | |
3310 | ||
3311 | /* This reloc will be computed at runtime, so there's no | |
3312 | need to do anything now, unless this is a RELATIVE | |
3313 | reloc in an unallocated section. */ | |
3314 | if (skip | |
3315 | || (input_section->flags & SEC_ALLOC) != 0 | |
3316 | || ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE) | |
3317 | continue; | |
3318 | } | |
3319 | ||
3320 | /* Arithmetic adjust relocations that aren't going into a | |
3321 | shared object. */ | |
3322 | if (r_type == R_PPC_ADDR16_HA | |
3323 | /* It's just possible that this symbol is a weak symbol | |
3324 | that's not actually defined anywhere. In that case, | |
3325 | 'sec' would be NULL, and we should leave the symbol | |
3326 | alone (it will be set to zero elsewhere in the link). */ | |
3327 | && sec != NULL) | |
3328 | { | |
3329 | addend += ((relocation + addend) & 0x8000) << 1; | |
3330 | } | |
3331 | break; | |
3332 | ||
3333 | /* branch taken prediction relocations */ | |
3334 | case (int)R_PPC_ADDR14_BRTAKEN: | |
3335 | case (int)R_PPC_REL14_BRTAKEN: | |
3336 | insn = bfd_get_32 (output_bfd, contents + offset); | |
3337 | if ((relocation - offset) & 0x8000) | |
3338 | insn &= ~BRANCH_PREDICT_BIT; | |
3339 | else | |
3340 | insn |= BRANCH_PREDICT_BIT; | |
3341 | bfd_put_32 (output_bfd, insn, contents + offset); | |
3342 | break; | |
3343 | ||
3344 | /* branch not taken predicition relocations */ | |
3345 | case (int)R_PPC_ADDR14_BRNTAKEN: | |
3346 | case (int)R_PPC_REL14_BRNTAKEN: | |
3347 | insn = bfd_get_32 (output_bfd, contents + offset); | |
3348 | if ((relocation - offset) & 0x8000) | |
3349 | insn |= BRANCH_PREDICT_BIT; | |
3350 | else | |
3351 | insn &= ~BRANCH_PREDICT_BIT; | |
3352 | bfd_put_32 (output_bfd, insn, contents + offset); | |
3353 | break; | |
3354 | ||
3355 | /* GOT16 relocations */ | |
3356 | case (int)R_PPC_GOT16: | |
3357 | case (int)R_PPC_GOT16_LO: | |
3358 | case (int)R_PPC_GOT16_HI: | |
3359 | case (int)R_PPC_GOT16_HA: | |
3360 | /* Relocation is to the entry for this symbol in the global | |
3361 | offset table. */ | |
3362 | BFD_ASSERT (sgot != NULL); | |
3363 | ||
3364 | if (h != NULL) | |
3365 | { | |
3366 | bfd_vma off; | |
3367 | ||
3368 | off = h->got.offset; | |
3369 | BFD_ASSERT (off != (bfd_vma) -1); | |
3370 | ||
3371 | if (! elf_hash_table (info)->dynamic_sections_created | |
3372 | || (info->shared | |
e1e0340b | 3373 | && SYMBOL_REFERENCES_LOCAL (info, h))) |
252b5132 RH |
3374 | { |
3375 | /* This is actually a static link, or it is a | |
3376 | -Bsymbolic link and the symbol is defined | |
3377 | locally. We must initialize this entry in the | |
3378 | global offset table. Since the offset must | |
3379 | always be a multiple of 4, we use the least | |
3380 | significant bit to record whether we have | |
3381 | initialized it already. | |
3382 | ||
3383 | When doing a dynamic link, we create a .rela.got | |
3384 | relocation entry to initialize the value. This | |
3385 | is done in the finish_dynamic_symbol routine. */ | |
3386 | if ((off & 1) != 0) | |
3387 | off &= ~1; | |
3388 | else | |
3389 | { | |
3390 | bfd_put_32 (output_bfd, relocation, | |
3391 | sgot->contents + off); | |
3392 | h->got.offset |= 1; | |
3393 | } | |
3394 | } | |
3395 | ||
3396 | relocation = sgot->output_offset + off - 4; | |
3397 | } | |
3398 | else | |
3399 | { | |
3400 | bfd_vma off; | |
3401 | ||
3402 | BFD_ASSERT (local_got_offsets != NULL | |
3403 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
3404 | ||
3405 | off = local_got_offsets[r_symndx]; | |
3406 | ||
3407 | /* The offset must always be a multiple of 4. We use | |
3408 | the least significant bit to record whether we have | |
3409 | already processed this entry. */ | |
3410 | if ((off & 1) != 0) | |
3411 | off &= ~1; | |
3412 | else | |
3413 | { | |
3414 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); | |
3415 | ||
3416 | if (info->shared) | |
3417 | { | |
3418 | asection *srelgot; | |
3419 | Elf_Internal_Rela outrel; | |
3420 | ||
3421 | /* We need to generate a R_PPC_RELATIVE reloc | |
3422 | for the dynamic linker. */ | |
3423 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
3424 | BFD_ASSERT (srelgot != NULL); | |
3425 | ||
3426 | outrel.r_offset = (sgot->output_section->vma | |
3427 | + sgot->output_offset | |
3428 | + off); | |
3429 | outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE); | |
3430 | outrel.r_addend = relocation; | |
3431 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
3432 | (((Elf32_External_Rela *) | |
3433 | srelgot->contents) | |
3434 | + srelgot->reloc_count)); | |
3435 | ++srelgot->reloc_count; | |
3436 | } | |
3437 | ||
3438 | local_got_offsets[r_symndx] |= 1; | |
3439 | } | |
3440 | ||
3441 | relocation = sgot->output_offset + off - 4; | |
3442 | } | |
3443 | break; | |
3444 | ||
3445 | /* Indirect .sdata relocation */ | |
3446 | case (int)R_PPC_EMB_SDAI16: | |
3447 | BFD_ASSERT (sdata != NULL); | |
3448 | relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info, | |
3449 | sdata, h, relocation, rel, | |
3450 | R_PPC_RELATIVE); | |
3451 | break; | |
3452 | ||
3453 | /* Indirect .sdata2 relocation */ | |
3454 | case (int)R_PPC_EMB_SDA2I16: | |
3455 | BFD_ASSERT (sdata2 != NULL); | |
3456 | relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info, | |
3457 | sdata2, h, relocation, rel, | |
3458 | R_PPC_RELATIVE); | |
3459 | break; | |
3460 | ||
3461 | /* Handle the TOC16 reloc. We want to use the offset within the .got | |
3462 | section, not the actual VMA. This is appropriate when generating | |
3463 | an embedded ELF object, for which the .got section acts like the | |
3464 | AIX .toc section. */ | |
3465 | case (int)R_PPC_TOC16: /* phony GOT16 relocations */ | |
3466 | BFD_ASSERT (sec != (asection *)0); | |
3467 | BFD_ASSERT (bfd_is_und_section (sec) | |
3468 | || strcmp (bfd_get_section_name (abfd, sec), ".got") == 0 | |
3469 | || strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0) | |
3470 | ||
3471 | addend -= sec->output_section->vma + sec->output_offset + 0x8000; | |
3472 | break; | |
3473 | ||
3474 | case (int)R_PPC_PLTREL24: | |
3475 | /* Relocation is to the entry for this symbol in the | |
3476 | procedure linkage table. */ | |
3477 | BFD_ASSERT (h != NULL); | |
3478 | ||
3479 | if (h->plt.offset == (bfd_vma) -1 | |
3480 | || splt == NULL) | |
3481 | { | |
3482 | /* We didn't make a PLT entry for this symbol. This | |
3483 | happens when statically linking PIC code, or when | |
3484 | using -Bsymbolic. */ | |
3485 | break; | |
3486 | } | |
3487 | ||
3488 | relocation = (splt->output_section->vma | |
3489 | + splt->output_offset | |
3490 | + h->plt.offset); | |
3491 | break; | |
3492 | ||
3493 | /* relocate against _SDA_BASE_ */ | |
3494 | case (int)R_PPC_SDAREL16: | |
3495 | { | |
3496 | const char *name; | |
3497 | ||
3498 | BFD_ASSERT (sec != (asection *)0); | |
3499 | name = bfd_get_section_name (abfd, sec->output_section); | |
3500 | if (strcmp (name, ".sdata") != 0 | |
3501 | && strcmp (name, ".sbss") != 0) | |
3502 | { | |
3503 | (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"), | |
3504 | bfd_get_filename (input_bfd), | |
3505 | sym_name, | |
3506 | ppc_elf_howto_table[ (int)r_type ]->name, | |
3507 | name); | |
3508 | } | |
3509 | addend -= (sdata->sym_hash->root.u.def.value | |
3510 | + sdata->sym_hash->root.u.def.section->output_section->vma | |
3511 | + sdata->sym_hash->root.u.def.section->output_offset); | |
3512 | } | |
3513 | break; | |
3514 | ||
3515 | ||
3516 | /* relocate against _SDA2_BASE_ */ | |
3517 | case (int)R_PPC_EMB_SDA2REL: | |
3518 | { | |
3519 | const char *name; | |
3520 | ||
3521 | BFD_ASSERT (sec != (asection *)0); | |
3522 | name = bfd_get_section_name (abfd, sec->output_section); | |
3523 | if (strcmp (name, ".sdata2") != 0 && strcmp (name, ".sbss2") != 0) | |
3524 | { | |
3525 | (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"), | |
3526 | bfd_get_filename (input_bfd), | |
3527 | sym_name, | |
3528 | ppc_elf_howto_table[ (int)r_type ]->name, | |
3529 | name); | |
3530 | ||
3531 | bfd_set_error (bfd_error_bad_value); | |
3532 | ret = false; | |
3533 | continue; | |
3534 | } | |
3535 | addend -= (sdata2->sym_hash->root.u.def.value | |
3536 | + sdata2->sym_hash->root.u.def.section->output_section->vma | |
3537 | + sdata2->sym_hash->root.u.def.section->output_offset); | |
3538 | } | |
3539 | break; | |
3540 | ||
3541 | ||
3542 | /* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */ | |
3543 | case (int)R_PPC_EMB_SDA21: | |
3544 | case (int)R_PPC_EMB_RELSDA: | |
3545 | { | |
3546 | const char *name; | |
3547 | int reg; | |
3548 | ||
3549 | BFD_ASSERT (sec != (asection *)0); | |
3550 | name = bfd_get_section_name (abfd, sec->output_section); | |
3551 | if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0) | |
3552 | { | |
3553 | reg = 13; | |
3554 | addend -= (sdata->sym_hash->root.u.def.value | |
3555 | + sdata->sym_hash->root.u.def.section->output_section->vma | |
3556 | + sdata->sym_hash->root.u.def.section->output_offset); | |
3557 | } | |
3558 | ||
3559 | else if (strcmp (name, ".sdata2") == 0 || strcmp (name, ".sbss2") == 0) | |
3560 | { | |
3561 | reg = 2; | |
3562 | addend -= (sdata2->sym_hash->root.u.def.value | |
3563 | + sdata2->sym_hash->root.u.def.section->output_section->vma | |
3564 | + sdata2->sym_hash->root.u.def.section->output_offset); | |
3565 | } | |
3566 | ||
3567 | else if (strcmp (name, ".PPC.EMB.sdata0") == 0 || strcmp (name, ".PPC.EMB.sbss0") == 0) | |
3568 | { | |
3569 | reg = 0; | |
3570 | } | |
3571 | ||
3572 | else | |
3573 | { | |
3574 | (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"), | |
3575 | bfd_get_filename (input_bfd), | |
3576 | sym_name, | |
3577 | ppc_elf_howto_table[ (int)r_type ]->name, | |
3578 | name); | |
3579 | ||
3580 | bfd_set_error (bfd_error_bad_value); | |
3581 | ret = false; | |
3582 | continue; | |
3583 | } | |
3584 | ||
3585 | if (r_type == R_PPC_EMB_SDA21) | |
3586 | { /* fill in register field */ | |
3587 | insn = bfd_get_32 (output_bfd, contents + offset); | |
3588 | insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT); | |
3589 | bfd_put_32 (output_bfd, insn, contents + offset); | |
3590 | } | |
3591 | } | |
3592 | break; | |
3593 | ||
3594 | /* Relocate against the beginning of the section */ | |
3595 | case (int)R_PPC_SECTOFF: | |
3596 | case (int)R_PPC_SECTOFF_LO: | |
3597 | case (int)R_PPC_SECTOFF_HI: | |
3598 | BFD_ASSERT (sec != (asection *)0); | |
3599 | addend -= sec->output_section->vma; | |
3600 | break; | |
3601 | ||
3602 | case (int)R_PPC_SECTOFF_HA: | |
3603 | BFD_ASSERT (sec != (asection *)0); | |
3604 | addend -= sec->output_section->vma; | |
3605 | addend += ((relocation + addend) & 0x8000) << 1; | |
3606 | break; | |
3607 | ||
3608 | /* Negative relocations */ | |
3609 | case (int)R_PPC_EMB_NADDR32: | |
3610 | case (int)R_PPC_EMB_NADDR16: | |
3611 | case (int)R_PPC_EMB_NADDR16_LO: | |
3612 | case (int)R_PPC_EMB_NADDR16_HI: | |
3613 | addend -= 2*relocation; | |
3614 | break; | |
3615 | ||
3616 | case (int)R_PPC_EMB_NADDR16_HA: | |
3617 | addend -= 2*relocation; | |
3618 | addend += ((relocation + addend) & 0x8000) << 1; | |
3619 | break; | |
3620 | ||
3621 | /* NOP relocation that prevents garbage collecting linkers from omitting a | |
3622 | reference. */ | |
3623 | case (int)R_PPC_EMB_MRKREF: | |
3624 | continue; | |
3625 | ||
3626 | case (int)R_PPC_COPY: | |
3627 | case (int)R_PPC_GLOB_DAT: | |
3628 | case (int)R_PPC_JMP_SLOT: | |
3629 | case (int)R_PPC_RELATIVE: | |
3630 | case (int)R_PPC_PLT32: | |
3631 | case (int)R_PPC_PLTREL32: | |
3632 | case (int)R_PPC_PLT16_LO: | |
3633 | case (int)R_PPC_PLT16_HI: | |
3634 | case (int)R_PPC_PLT16_HA: | |
3635 | case (int)R_PPC_EMB_RELSEC16: | |
3636 | case (int)R_PPC_EMB_RELST_LO: | |
3637 | case (int)R_PPC_EMB_RELST_HI: | |
3638 | case (int)R_PPC_EMB_RELST_HA: | |
3639 | case (int)R_PPC_EMB_BIT_FLD: | |
3640 | (*_bfd_error_handler) (_("%s: Relocation %s is not yet supported for symbol %s."), | |
3641 | bfd_get_filename (input_bfd), | |
3642 | ppc_elf_howto_table[ (int)r_type ]->name, | |
3643 | sym_name); | |
3644 | ||
3645 | bfd_set_error (bfd_error_invalid_operation); | |
3646 | ret = false; | |
3647 | continue; | |
3648 | ||
3649 | case (int)R_PPC_GNU_VTINHERIT: | |
3650 | case (int)R_PPC_GNU_VTENTRY: | |
3651 | /* These are no-ops in the end. */ | |
3652 | continue; | |
3653 | } | |
3654 | ||
3655 | ||
3656 | #ifdef DEBUG | |
3657 | fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n", | |
3658 | howto->name, | |
3659 | (int)r_type, | |
3660 | sym_name, | |
3661 | r_symndx, | |
3662 | (long)offset, | |
3663 | (long)addend); | |
3664 | #endif | |
3665 | ||
3666 | r = _bfd_final_link_relocate (howto, | |
3667 | input_bfd, | |
3668 | input_section, | |
3669 | contents, | |
3670 | offset, | |
3671 | relocation, | |
3672 | addend); | |
3673 | ||
dc1bc0c9 RH |
3674 | if (r == bfd_reloc_ok) |
3675 | ; | |
3676 | else if (r == bfd_reloc_overflow) | |
252b5132 | 3677 | { |
dc1bc0c9 RH |
3678 | const char *name; |
3679 | ||
3680 | if (h != NULL) | |
252b5132 | 3681 | { |
dc1bc0c9 RH |
3682 | if (h->root.type == bfd_link_hash_undefweak |
3683 | && howto->pc_relative) | |
3684 | { | |
3685 | /* Assume this is a call protected by other code that | |
3686 | detect the symbol is undefined. If this is the case, | |
3687 | we can safely ignore the overflow. If not, the | |
3688 | program is hosed anyway, and a little warning isn't | |
3689 | going to help. */ | |
252b5132 | 3690 | |
dc1bc0c9 RH |
3691 | continue; |
3692 | } | |
252b5132 | 3693 | |
dc1bc0c9 RH |
3694 | name = h->root.root.string; |
3695 | } | |
3696 | else | |
3697 | { | |
3698 | name = bfd_elf_string_from_elf_section (input_bfd, | |
3699 | symtab_hdr->sh_link, | |
3700 | sym->st_name); | |
3701 | if (name == NULL) | |
3702 | continue; | |
3703 | if (*name == '\0') | |
3704 | name = bfd_section_name (input_bfd, sec); | |
252b5132 | 3705 | } |
dc1bc0c9 | 3706 | |
464e1740 ILT |
3707 | if (! (*info->callbacks->reloc_overflow)(info, |
3708 | name, | |
3709 | howto->name, | |
3710 | (bfd_vma) 0, | |
3711 | input_bfd, | |
3712 | input_section, | |
3713 | offset)) | |
3714 | return false; | |
252b5132 | 3715 | } |
dc1bc0c9 RH |
3716 | else |
3717 | ret = false; | |
252b5132 RH |
3718 | } |
3719 | ||
252b5132 RH |
3720 | #ifdef DEBUG |
3721 | fprintf (stderr, "\n"); | |
3722 | #endif | |
3723 | ||
3724 | return ret; | |
3725 | } | |
3726 | ||
3727 | \f | |
3728 | #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec | |
3729 | #define TARGET_LITTLE_NAME "elf32-powerpcle" | |
3730 | #define TARGET_BIG_SYM bfd_elf32_powerpc_vec | |
3731 | #define TARGET_BIG_NAME "elf32-powerpc" | |
3732 | #define ELF_ARCH bfd_arch_powerpc | |
3733 | #define ELF_MACHINE_CODE EM_PPC | |
3734 | #define ELF_MAXPAGESIZE 0x10000 | |
3735 | #define elf_info_to_howto ppc_elf_info_to_howto | |
3736 | ||
3737 | #ifdef EM_CYGNUS_POWERPC | |
3738 | #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC | |
3739 | #endif | |
3740 | ||
3741 | #ifdef EM_PPC_OLD | |
3742 | #define ELF_MACHINE_ALT2 EM_PPC_OLD | |
3743 | #endif | |
3744 | ||
3745 | #define elf_backend_plt_not_loaded 1 | |
3746 | #define elf_backend_got_symbol_offset 4 | |
3747 | #define elf_backend_can_gc_sections 1 | |
3748 | #define elf_backend_got_header_size 12 | |
3749 | #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE | |
3750 | ||
3751 | #define bfd_elf32_bfd_copy_private_bfd_data ppc_elf_copy_private_bfd_data | |
3752 | #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data | |
3753 | #define bfd_elf32_bfd_relax_section ppc_elf_relax_section | |
3754 | #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup | |
3755 | #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags | |
3756 | #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link | |
3757 | ||
3758 | #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook | |
3759 | #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook | |
3760 | #define elf_backend_section_from_shdr ppc_elf_section_from_shdr | |
3761 | #define elf_backend_relocate_section ppc_elf_relocate_section | |
3762 | #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections | |
3763 | #define elf_backend_check_relocs ppc_elf_check_relocs | |
3764 | #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol | |
3765 | #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook | |
3766 | #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections | |
3767 | #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol | |
3768 | #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections | |
3769 | #define elf_backend_fake_sections ppc_elf_fake_sections | |
3770 | #define elf_backend_additional_program_headers ppc_elf_additional_program_headers | |
3771 | #define elf_backend_modify_segment_map ppc_elf_modify_segment_map | |
3772 | ||
3773 | #include "elf32-target.h" |