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15bda425 JL |
1 | /* Generic support for 64-bit ELF |
2 | Copyright 1999, 2000 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "bfd.h" | |
21 | #include "sysdep.h" | |
22 | #include "libbfd.h" | |
23 | #include "elf-bfd.h" | |
24 | #include "elf/hppa.h" | |
25 | #include "libhppa.h" | |
26 | #include "elf64-hppa.h" | |
27 | #define ARCH_SIZE 64 | |
28 | ||
29 | #define PLT_ENTRY_SIZE 0x10 | |
30 | #define DLT_ENTRY_SIZE 0x8 | |
31 | #define OPD_ENTRY_SIZE 0x20 | |
32 | ||
33 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/pa20_64/dld.sl" | |
34 | ||
35 | /* The stub is supposed to load the target address and target's DP | |
36 | value out of the PLT, then do an external branch to the target | |
37 | address. | |
38 | ||
39 | LDD PLTOFF(%r27),%r1 | |
40 | BVE (%r1) | |
41 | LDD PLTOFF+8(%r27),%r27 | |
42 | ||
43 | Note that we must use the LDD with a 14 bit displacement, not the one | |
44 | with a 5 bit displacement. */ | |
45 | static char plt_stub[] = {0x53, 0x61, 0x00, 0x00, 0xe8, 0x20, 0xd0, 0x00, | |
46 | 0x53, 0x7b, 0x00, 0x00 }; | |
47 | ||
48 | struct elf64_hppa_dyn_hash_entry | |
49 | { | |
50 | struct bfd_hash_entry root; | |
51 | ||
52 | /* Offsets for this symbol in various linker sections. */ | |
53 | bfd_vma dlt_offset; | |
54 | bfd_vma plt_offset; | |
55 | bfd_vma opd_offset; | |
56 | bfd_vma stub_offset; | |
57 | ||
58 | /* The symbol table entry, if any, that this was derrived from. */ | |
59 | struct elf_link_hash_entry *h; | |
60 | ||
61 | /* The index of the (possibly local) symbol in the input bfd and its | |
62 | associated BFD. Needed so that we can have relocs against local | |
63 | symbols in shared libraries. */ | |
64 | unsigned long sym_indx; | |
65 | bfd *owner; | |
66 | ||
67 | /* Dynamic symbols may need to have two different values. One for | |
68 | the dynamic symbol table, one for the normal symbol table. | |
69 | ||
70 | In such cases we store the symbol's real value and section | |
71 | index here so we can restore the real value before we write | |
72 | the normal symbol table. */ | |
73 | bfd_vma st_value; | |
74 | int st_shndx; | |
75 | ||
76 | /* Used to count non-got, non-plt relocations for delayed sizing | |
77 | of relocation sections. */ | |
78 | struct elf64_hppa_dyn_reloc_entry | |
79 | { | |
80 | /* Next relocation in the chain. */ | |
81 | struct elf64_hppa_dyn_reloc_entry *next; | |
82 | ||
83 | /* The type of the relocation. */ | |
84 | int type; | |
85 | ||
86 | /* The input section of the relocation. */ | |
87 | asection *sec; | |
88 | ||
89 | /* The index of the section symbol for the input section of | |
90 | the relocation. Only needed when building shared libraries. */ | |
91 | int sec_symndx; | |
92 | ||
93 | /* The offset within the input section of the relocation. */ | |
94 | bfd_vma offset; | |
95 | ||
96 | /* The addend for the relocation. */ | |
97 | bfd_vma addend; | |
98 | ||
99 | } *reloc_entries; | |
100 | ||
101 | /* Nonzero if this symbol needs an entry in one of the linker | |
102 | sections. */ | |
103 | unsigned want_dlt; | |
104 | unsigned want_plt; | |
105 | unsigned want_opd; | |
106 | unsigned want_stub; | |
107 | }; | |
108 | ||
109 | struct elf64_hppa_dyn_hash_table | |
110 | { | |
111 | struct bfd_hash_table root; | |
112 | }; | |
113 | ||
114 | struct elf64_hppa_link_hash_table | |
115 | { | |
116 | struct elf_link_hash_table root; | |
117 | ||
118 | /* Shortcuts to get to the various linker defined sections. */ | |
119 | asection *dlt_sec; | |
120 | asection *dlt_rel_sec; | |
121 | asection *plt_sec; | |
122 | asection *plt_rel_sec; | |
123 | asection *opd_sec; | |
124 | asection *opd_rel_sec; | |
125 | asection *other_rel_sec; | |
126 | ||
127 | /* Offset of __gp within .plt section. When the PLT gets large we want | |
128 | to slide __gp into the PLT section so that we can continue to use | |
129 | single DP relative instructions to load values out of the PLT. */ | |
130 | bfd_vma gp_offset; | |
131 | ||
132 | /* Note this is not strictly correct. We should create a stub section for | |
133 | each input section with calls. The stub section should be placed before | |
134 | the section with the call. */ | |
135 | asection *stub_sec; | |
136 | ||
137 | bfd_vma text_segment_base; | |
138 | bfd_vma data_segment_base; | |
139 | ||
140 | struct elf64_hppa_dyn_hash_table dyn_hash_table; | |
141 | ||
142 | /* We build tables to map from an input section back to its | |
143 | symbol index. This is the BFD for which we currently have | |
144 | a map. */ | |
145 | bfd *section_syms_bfd; | |
146 | ||
147 | /* Array of symbol numbers for each input section attached to the | |
148 | current BFD. */ | |
149 | int *section_syms; | |
150 | }; | |
151 | ||
152 | #define elf64_hppa_hash_table(p) \ | |
153 | ((struct elf64_hppa_link_hash_table *) ((p)->hash)) | |
154 | ||
155 | typedef struct bfd_hash_entry *(*new_hash_entry_func) | |
156 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
157 | ||
158 | static boolean elf64_hppa_dyn_hash_table_init | |
159 | PARAMS ((struct elf64_hppa_dyn_hash_table *ht, bfd *abfd, | |
160 | new_hash_entry_func new)); | |
161 | static struct bfd_hash_entry *elf64_hppa_new_dyn_hash_entry | |
162 | PARAMS ((struct bfd_hash_entry *entry, struct bfd_hash_table *table, | |
163 | const char *string)); | |
164 | static struct bfd_link_hash_table *elf64_hppa_hash_table_create | |
165 | PARAMS ((bfd *abfd)); | |
166 | static struct elf64_hppa_dyn_hash_entry *elf64_hppa_dyn_hash_lookup | |
167 | PARAMS ((struct elf64_hppa_dyn_hash_table *table, const char *string, | |
168 | boolean create, boolean copy)); | |
169 | static void elf64_hppa_dyn_hash_traverse | |
170 | PARAMS ((struct elf64_hppa_dyn_hash_table *table, | |
171 | boolean (*func)(struct elf64_hppa_dyn_hash_entry *, PTR), | |
172 | PTR info)); | |
173 | ||
174 | static const char *get_dyn_name | |
175 | PARAMS ((bfd *abfd, struct elf_link_hash_entry *h, | |
176 | const Elf_Internal_Rela *rel, char **pbuf, size_t *plen)); | |
177 | ||
178 | ||
179 | /* This must follow the definitions of the various derived linker | |
180 | hash tables and shared functions. */ | |
181 | #include "elf-hppa.h" | |
182 | ||
183 | ||
184 | static boolean elf64_hppa_object_p | |
185 | PARAMS ((bfd *)); | |
186 | ||
187 | static boolean elf64_hppa_section_from_shdr | |
188 | PARAMS ((bfd *, Elf64_Internal_Shdr *, char *)); | |
189 | ||
190 | static void elf64_hppa_post_process_headers | |
191 | PARAMS ((bfd *, struct bfd_link_info *)); | |
192 | ||
193 | static boolean elf64_hppa_create_dynamic_sections | |
194 | PARAMS ((bfd *, struct bfd_link_info *)); | |
195 | ||
196 | static boolean elf64_hppa_adjust_dynamic_symbol | |
197 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
198 | ||
199 | static boolean elf64_hppa_size_dynamic_sections | |
200 | PARAMS ((bfd *, struct bfd_link_info *)); | |
201 | ||
202 | static boolean elf64_hppa_finish_dynamic_symbol | |
203 | PARAMS ((bfd *, struct bfd_link_info *, | |
204 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
205 | ||
206 | static boolean elf64_hppa_finish_dynamic_sections | |
207 | PARAMS ((bfd *, struct bfd_link_info *)); | |
208 | ||
209 | static boolean elf64_hppa_check_relocs | |
210 | PARAMS ((bfd *, struct bfd_link_info *, | |
211 | asection *, const Elf_Internal_Rela *)); | |
212 | ||
213 | static boolean elf64_hppa_dynamic_symbol_p | |
214 | PARAMS ((struct elf_link_hash_entry *, struct bfd_link_info *)); | |
215 | ||
216 | static boolean elf64_hppa_mark_exported_functions | |
217 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
218 | ||
219 | static boolean elf64_hppa_finalize_opd | |
220 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
221 | ||
222 | static boolean elf64_hppa_finalize_dlt | |
223 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
224 | ||
225 | static boolean allocate_global_data_dlt | |
226 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
227 | ||
228 | static boolean allocate_global_data_plt | |
229 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
230 | ||
231 | static boolean allocate_global_data_stub | |
232 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
233 | ||
234 | static boolean allocate_global_data_opd | |
235 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
236 | ||
237 | static boolean get_reloc_section | |
238 | PARAMS ((bfd *, struct elf64_hppa_link_hash_table *, asection *)); | |
239 | ||
240 | static boolean count_dyn_reloc | |
241 | PARAMS ((bfd *, struct elf64_hppa_dyn_hash_entry *, | |
242 | int, asection *, int, bfd_vma, bfd_vma)); | |
243 | ||
244 | static boolean allocate_dynrel_entries | |
245 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
246 | ||
247 | static boolean elf64_hppa_finalize_dynreloc | |
248 | PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
249 | ||
250 | static boolean get_opd | |
251 | PARAMS ((bfd *, struct bfd_link_info *, struct elf64_hppa_link_hash_table *)); | |
252 | ||
253 | static boolean get_plt | |
254 | PARAMS ((bfd *, struct bfd_link_info *, struct elf64_hppa_link_hash_table *)); | |
255 | ||
256 | static boolean get_dlt | |
257 | PARAMS ((bfd *, struct bfd_link_info *, struct elf64_hppa_link_hash_table *)); | |
258 | ||
259 | static boolean get_stub | |
260 | PARAMS ((bfd *, struct bfd_link_info *, struct elf64_hppa_link_hash_table *)); | |
261 | ||
262 | static boolean | |
263 | elf64_hppa_dyn_hash_table_init (ht, abfd, new) | |
264 | struct elf64_hppa_dyn_hash_table *ht; | |
265 | bfd *abfd; | |
266 | new_hash_entry_func new; | |
267 | { | |
268 | memset (ht, 0, sizeof(*ht)); | |
269 | return bfd_hash_table_init (&ht->root, new); | |
270 | } | |
271 | ||
272 | static struct bfd_hash_entry* | |
273 | elf64_hppa_new_dyn_hash_entry (entry, table, string) | |
274 | struct bfd_hash_entry *entry; | |
275 | struct bfd_hash_table *table; | |
276 | const char *string; | |
277 | { | |
278 | struct elf64_hppa_dyn_hash_entry *ret; | |
279 | ret = (struct elf64_hppa_dyn_hash_entry *) entry; | |
280 | ||
281 | /* Allocate the structure if it has not already been allocated by a | |
282 | subclass. */ | |
283 | if (!ret) | |
284 | ret = bfd_hash_allocate (table, sizeof (*ret)); | |
285 | ||
286 | if (!ret) | |
287 | return 0; | |
288 | ||
289 | /* Initialize our local data. All zeros, and definitely easier | |
290 | than setting 8 bit fields. */ | |
291 | memset (ret, 0, sizeof(*ret)); | |
292 | ||
293 | /* Call the allocation method of the superclass. */ | |
294 | ret = ((struct elf64_hppa_dyn_hash_entry *) | |
295 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); | |
296 | ||
297 | return &ret->root; | |
298 | } | |
299 | ||
300 | /* Create the derived linker hash table. The PA64 ELF port uses this | |
301 | derived hash table to keep information specific to the PA ElF | |
302 | linker (without using static variables). */ | |
303 | ||
304 | static struct bfd_link_hash_table* | |
305 | elf64_hppa_hash_table_create (abfd) | |
306 | bfd *abfd; | |
307 | { | |
308 | struct elf64_hppa_link_hash_table *ret; | |
309 | ||
310 | ret = bfd_zalloc (abfd, sizeof (*ret)); | |
311 | if (!ret) | |
312 | return 0; | |
313 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, | |
314 | _bfd_elf_link_hash_newfunc)) | |
315 | { | |
316 | bfd_release (abfd, ret); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | if (!elf64_hppa_dyn_hash_table_init (&ret->dyn_hash_table, abfd, | |
321 | elf64_hppa_new_dyn_hash_entry)) | |
322 | return 0; | |
323 | return &ret->root.root; | |
324 | } | |
325 | ||
326 | /* Look up an entry in a PA64 ELF linker hash table. */ | |
327 | ||
328 | static struct elf64_hppa_dyn_hash_entry * | |
329 | elf64_hppa_dyn_hash_lookup(table, string, create, copy) | |
330 | struct elf64_hppa_dyn_hash_table *table; | |
331 | const char *string; | |
332 | boolean create, copy; | |
333 | { | |
334 | return ((struct elf64_hppa_dyn_hash_entry *) | |
335 | bfd_hash_lookup (&table->root, string, create, copy)); | |
336 | } | |
337 | ||
338 | /* Traverse a PA64 ELF linker hash table. */ | |
339 | ||
340 | static void | |
341 | elf64_hppa_dyn_hash_traverse (table, func, info) | |
342 | struct elf64_hppa_dyn_hash_table *table; | |
343 | boolean (*func) PARAMS ((struct elf64_hppa_dyn_hash_entry *, PTR)); | |
344 | PTR info; | |
345 | { | |
346 | (bfd_hash_traverse | |
347 | (&table->root, | |
348 | (boolean (*) PARAMS ((struct bfd_hash_entry *, PTR))) func, | |
349 | info)); | |
350 | } | |
351 | \f | |
352 | /* Return nonzero if ABFD represents a PA2.0 ELF64 file. | |
353 | ||
354 | Additionally we set the default architecture and machine. */ | |
355 | static boolean | |
356 | elf64_hppa_object_p (abfd) | |
357 | bfd *abfd; | |
358 | { | |
359 | /* Set the right machine number for an HPPA ELF file. */ | |
360 | return bfd_default_set_arch_mach (abfd, bfd_arch_hppa, 25); | |
361 | } | |
362 | ||
363 | /* Given section type (hdr->sh_type), return a boolean indicating | |
364 | whether or not the section is an elf64-hppa specific section. */ | |
365 | static boolean | |
366 | elf64_hppa_section_from_shdr (abfd, hdr, name) | |
367 | bfd *abfd; | |
368 | Elf64_Internal_Shdr *hdr; | |
369 | char *name; | |
370 | { | |
371 | asection *newsect; | |
372 | ||
373 | switch (hdr->sh_type) | |
374 | { | |
375 | case SHT_PARISC_EXT: | |
376 | if (strcmp (name, ".PARISC.archext") != 0) | |
377 | return false; | |
378 | break; | |
379 | case SHT_PARISC_UNWIND: | |
380 | if (strcmp (name, ".PARISC.unwind") != 0) | |
381 | return false; | |
382 | break; | |
383 | case SHT_PARISC_DOC: | |
384 | case SHT_PARISC_ANNOT: | |
385 | default: | |
386 | return false; | |
387 | } | |
388 | ||
389 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name)) | |
390 | return false; | |
391 | newsect = hdr->bfd_section; | |
392 | ||
393 | return true; | |
394 | } | |
395 | ||
396 | ||
397 | /* Construct a string for use in the elf64_hppa_dyn_hash_table. The | |
398 | name describes what was once potentially anonymous memory. We | |
399 | allocate memory as necessary, possibly reusing PBUF/PLEN. */ | |
400 | ||
401 | static const char * | |
402 | get_dyn_name (abfd, h, rel, pbuf, plen) | |
403 | bfd *abfd; | |
404 | struct elf_link_hash_entry *h; | |
405 | const Elf_Internal_Rela *rel; | |
406 | char **pbuf; | |
407 | size_t *plen; | |
408 | { | |
409 | size_t nlen, tlen; | |
410 | char *buf; | |
411 | size_t len; | |
412 | ||
413 | if (h && rel->r_addend == 0) | |
414 | return h->root.root.string; | |
415 | ||
416 | if (h) | |
417 | nlen = strlen (h->root.root.string); | |
418 | else | |
419 | { | |
420 | nlen = sizeof(void*)*2 + 1 + sizeof(bfd_vma)*4 + 1 + 1; | |
421 | nlen += 10; /* %p slop */ | |
422 | } | |
423 | tlen = nlen + 1 + 16 + 1; | |
424 | ||
425 | len = *plen; | |
426 | buf = *pbuf; | |
427 | if (len < tlen) | |
428 | { | |
429 | if (buf) | |
430 | free (buf); | |
431 | *pbuf = buf = malloc (tlen); | |
432 | *plen = len = tlen; | |
433 | if (!buf) | |
434 | return NULL; | |
435 | } | |
436 | ||
437 | if (h) | |
438 | { | |
439 | memcpy (buf, h->root.root.string, nlen); | |
440 | sprintf_vma (buf + nlen, rel->r_addend); | |
441 | } | |
442 | else | |
443 | { | |
444 | nlen = sprintf (buf, "%p:%lx", abfd, ELF64_R_SYM (rel->r_info)); | |
445 | if (rel->r_addend) | |
446 | { | |
447 | buf[nlen++] = '+'; | |
448 | sprintf_vma (buf + nlen, rel->r_addend); | |
449 | } | |
450 | } | |
451 | ||
452 | return buf; | |
453 | } | |
454 | ||
455 | /* SEC is a section containing relocs for an input BFD when linking; return | |
456 | a suitable section for holding relocs in the output BFD for a link. */ | |
457 | ||
458 | static boolean | |
459 | get_reloc_section (abfd, hppa_info, sec) | |
460 | bfd *abfd; | |
461 | struct elf64_hppa_link_hash_table *hppa_info; | |
462 | asection *sec; | |
463 | { | |
464 | const char *srel_name; | |
465 | asection *srel; | |
466 | bfd *dynobj; | |
467 | ||
468 | srel_name = (bfd_elf_string_from_elf_section | |
469 | (abfd, elf_elfheader(abfd)->e_shstrndx, | |
470 | elf_section_data(sec)->rel_hdr.sh_name)); | |
471 | if (srel_name == NULL) | |
472 | return false; | |
473 | ||
474 | BFD_ASSERT ((strncmp (srel_name, ".rela", 5) == 0 | |
475 | && strcmp (bfd_get_section_name (abfd, sec), | |
476 | srel_name+5) == 0) | |
477 | || (strncmp (srel_name, ".rel", 4) == 0 | |
478 | && strcmp (bfd_get_section_name (abfd, sec), | |
479 | srel_name+4) == 0)); | |
480 | ||
481 | dynobj = hppa_info->root.dynobj; | |
482 | if (!dynobj) | |
483 | hppa_info->root.dynobj = dynobj = abfd; | |
484 | ||
485 | srel = bfd_get_section_by_name (dynobj, srel_name); | |
486 | if (srel == NULL) | |
487 | { | |
488 | srel = bfd_make_section (dynobj, srel_name); | |
489 | if (srel == NULL | |
490 | || !bfd_set_section_flags (dynobj, srel, | |
491 | (SEC_ALLOC | |
492 | | SEC_LOAD | |
493 | | SEC_HAS_CONTENTS | |
494 | | SEC_IN_MEMORY | |
495 | | SEC_LINKER_CREATED | |
496 | | SEC_READONLY)) | |
497 | || !bfd_set_section_alignment (dynobj, srel, 3)) | |
498 | return false; | |
499 | } | |
500 | ||
501 | hppa_info->other_rel_sec = srel; | |
502 | return true; | |
503 | } | |
504 | ||
505 | /* Add a new entry to the list of dynamic relocations against DYN_H. | |
506 | ||
507 | We use this to keep a record of all the FPTR relocations against a | |
508 | particular symbol so that we can create FPTR relocations in the | |
509 | output file. */ | |
510 | ||
511 | static boolean | |
512 | count_dyn_reloc (abfd, dyn_h, type, sec, sec_symndx, offset, addend) | |
513 | bfd *abfd; | |
514 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
515 | int type; | |
516 | asection *sec; | |
517 | int sec_symndx; | |
518 | bfd_vma offset; | |
519 | bfd_vma addend; | |
520 | { | |
521 | struct elf64_hppa_dyn_reloc_entry *rent; | |
522 | ||
523 | rent = (struct elf64_hppa_dyn_reloc_entry *) | |
524 | bfd_alloc (abfd, sizeof (*rent)); | |
525 | if (!rent) | |
526 | return false; | |
527 | ||
528 | rent->next = dyn_h->reloc_entries; | |
529 | rent->type = type; | |
530 | rent->sec = sec; | |
531 | rent->sec_symndx = sec_symndx; | |
532 | rent->offset = offset; | |
533 | rent->addend = addend; | |
534 | dyn_h->reloc_entries = rent; | |
535 | ||
536 | return true; | |
537 | } | |
538 | ||
539 | /* Scan the RELOCS and record the type of dynamic entries that each | |
540 | referenced symbol needs. */ | |
541 | ||
542 | static boolean | |
543 | elf64_hppa_check_relocs (abfd, info, sec, relocs) | |
544 | bfd *abfd; | |
545 | struct bfd_link_info *info; | |
546 | asection *sec; | |
547 | const Elf_Internal_Rela *relocs; | |
548 | { | |
549 | struct elf64_hppa_link_hash_table *hppa_info; | |
550 | const Elf_Internal_Rela *relend; | |
551 | Elf_Internal_Shdr *symtab_hdr; | |
552 | const Elf_Internal_Rela *rel; | |
553 | asection *dlt, *plt, *stubs; | |
554 | char *buf; | |
555 | size_t buf_len; | |
556 | int sec_symndx; | |
557 | ||
558 | if (info->relocateable) | |
559 | return true; | |
560 | ||
561 | /* If this is the first dynamic object found in the link, create | |
562 | the special sections required for dynamic linking. */ | |
563 | if (! elf_hash_table (info)->dynamic_sections_created) | |
564 | { | |
565 | if (! bfd_elf64_link_create_dynamic_sections (abfd, info)) | |
566 | return false; | |
567 | } | |
568 | ||
569 | hppa_info = elf64_hppa_hash_table (info); | |
570 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
571 | ||
572 | /* If necessary, build a new table holding section symbols indices | |
573 | for this BFD. This is disgusting. */ | |
574 | ||
575 | if (info->shared && hppa_info->section_syms_bfd != abfd) | |
576 | { | |
577 | int i, highest_shndx; | |
578 | asection *section; | |
579 | Elf_Internal_Sym *local_syms, *isym; | |
580 | Elf64_External_Sym *ext_syms, *esym; | |
581 | ||
582 | /* We're done with the old cache of section index to section symbol | |
583 | index information. Free it. | |
584 | ||
585 | ?!? Note we leak the last section_syms array. Presumably we | |
586 | could free it in one of the later routines in this file. */ | |
587 | if (hppa_info->section_syms) | |
588 | free (hppa_info->section_syms); | |
589 | ||
590 | /* Allocate memory for the internal and external symbols. */ | |
591 | local_syms | |
592 | = (Elf_Internal_Sym *) bfd_malloc (symtab_hdr->sh_info | |
593 | * sizeof (Elf_Internal_Sym)); | |
594 | if (local_syms == NULL) | |
595 | return false; | |
596 | ||
597 | ext_syms | |
598 | = (Elf64_External_Sym *) bfd_malloc (symtab_hdr->sh_info | |
599 | * sizeof (Elf64_External_Sym)); | |
600 | if (ext_syms == NULL) | |
601 | { | |
602 | free (local_syms); | |
603 | return false; | |
604 | } | |
605 | ||
606 | /* Read in the local symbols. */ | |
607 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 | |
608 | || bfd_read (ext_syms, 1, | |
609 | (symtab_hdr->sh_info | |
610 | * sizeof (Elf64_External_Sym)), abfd) | |
611 | != (symtab_hdr->sh_info * sizeof (Elf64_External_Sym))) | |
612 | { | |
613 | free (local_syms); | |
614 | free (ext_syms); | |
615 | return false; | |
616 | } | |
617 | ||
618 | /* Swap in the local symbols, also record the highest section index | |
619 | referenced by the local symbols. */ | |
620 | isym = local_syms; | |
621 | esym = ext_syms; | |
622 | highest_shndx = 0; | |
623 | for (i = 0; i < symtab_hdr->sh_info; i++, esym++, isym++) | |
624 | { | |
625 | bfd_elf64_swap_symbol_in (abfd, esym, isym); | |
626 | if (isym->st_shndx > highest_shndx) | |
627 | highest_shndx = isym->st_shndx; | |
628 | } | |
629 | ||
630 | /* Now we can free the external symbols. */ | |
631 | free (ext_syms); | |
632 | ||
633 | /* Allocate an array to hold the section index to section symbol index | |
634 | mapping. Bump by one since we start counting at zero. */ | |
635 | highest_shndx++; | |
636 | hppa_info->section_syms = (int *) bfd_malloc (highest_shndx | |
637 | * sizeof (int)); | |
638 | ||
639 | /* Now walk the local symbols again. If we find a section symbol, | |
640 | record the index of the symbol into the section_syms array. */ | |
641 | for (isym = local_syms, i = 0; i < symtab_hdr->sh_info; i++, isym++) | |
642 | { | |
643 | if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) | |
644 | hppa_info->section_syms[isym->st_shndx] = i; | |
645 | } | |
646 | ||
647 | /* We are finished with the local symbols. Get rid of them. */ | |
648 | free (local_syms); | |
649 | ||
650 | /* Record which BFD we built the section_syms mapping for. */ | |
651 | hppa_info->section_syms_bfd = abfd; | |
652 | } | |
653 | ||
654 | /* Record the symbol index for this input section. We may need it for | |
655 | relocations when building shared libraries. When not building shared | |
656 | libraries this value is never really used, but assign it to zero to | |
657 | prevent out of bounds memory accesses in other routines. */ | |
658 | if (info->shared) | |
659 | { | |
660 | sec_symndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
661 | ||
662 | /* If we did not find a section symbol for this section, then | |
663 | something went terribly wrong above. */ | |
664 | if (sec_symndx == -1) | |
665 | return false; | |
666 | ||
667 | sec_symndx = hppa_info->section_syms[sec_symndx]; | |
668 | } | |
669 | else | |
670 | sec_symndx = 0; | |
671 | ||
672 | dlt = plt = stubs = NULL; | |
673 | buf = NULL; | |
674 | buf_len = 0; | |
675 | ||
676 | relend = relocs + sec->reloc_count; | |
677 | for (rel = relocs; rel < relend; ++rel) | |
678 | { | |
679 | enum { | |
680 | NEED_DLT = 1, | |
681 | NEED_PLT = 2, | |
682 | NEED_STUB = 4, | |
683 | NEED_OPD = 8, | |
684 | NEED_DYNREL = 16, | |
685 | }; | |
686 | ||
687 | struct elf_link_hash_entry *h = NULL; | |
688 | unsigned long r_symndx = ELF64_R_SYM (rel->r_info); | |
689 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
690 | int need_entry; | |
691 | const char *addr_name; | |
692 | boolean maybe_dynamic; | |
693 | int dynrel_type = R_PARISC_NONE; | |
694 | static reloc_howto_type *howto; | |
695 | ||
696 | if (r_symndx >= symtab_hdr->sh_info) | |
697 | { | |
698 | /* We're dealing with a global symbol -- find its hash entry | |
699 | and mark it as being referenced. */ | |
700 | long indx = r_symndx - symtab_hdr->sh_info; | |
701 | h = elf_sym_hashes (abfd)[indx]; | |
702 | while (h->root.type == bfd_link_hash_indirect | |
703 | || h->root.type == bfd_link_hash_warning) | |
704 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
705 | ||
706 | h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR; | |
707 | } | |
708 | ||
709 | /* We can only get preliminary data on whether a symbol is | |
710 | locally or externally defined, as not all of the input files | |
711 | have yet been processed. Do something with what we know, as | |
712 | this may help reduce memory usage and processing time later. */ | |
713 | maybe_dynamic = false; | |
714 | if (h && ((info->shared && ! info->symbolic) | |
715 | || ! (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) | |
716 | || h->root.type == bfd_link_hash_defweak)) | |
717 | maybe_dynamic = true; | |
718 | ||
719 | howto = elf_hppa_howto_table + ELF64_R_TYPE (rel->r_info); | |
720 | need_entry = 0; | |
721 | switch (howto->type) | |
722 | { | |
723 | /* These are simple indirect references to symbols through the | |
724 | DLT. We need to create a DLT entry for any symbols which | |
725 | appears in a DLTIND relocation. */ | |
726 | case R_PARISC_DLTIND21L: | |
727 | case R_PARISC_DLTIND14R: | |
728 | case R_PARISC_DLTIND14F: | |
729 | case R_PARISC_DLTIND14WR: | |
730 | case R_PARISC_DLTIND14DR: | |
731 | need_entry = NEED_DLT; | |
732 | break; | |
733 | ||
734 | /* ?!? These need a DLT entry. But I have no idea what to do with | |
735 | the "link time TP value. */ | |
736 | case R_PARISC_LTOFF_TP21L: | |
737 | case R_PARISC_LTOFF_TP14R: | |
738 | case R_PARISC_LTOFF_TP14F: | |
739 | case R_PARISC_LTOFF_TP64: | |
740 | case R_PARISC_LTOFF_TP14WR: | |
741 | case R_PARISC_LTOFF_TP14DR: | |
742 | case R_PARISC_LTOFF_TP16F: | |
743 | case R_PARISC_LTOFF_TP16WF: | |
744 | case R_PARISC_LTOFF_TP16DF: | |
745 | need_entry = NEED_DLT; | |
746 | break; | |
747 | ||
748 | /* These are function calls. Depending on their precise target we | |
749 | may need to make a stub for them. The stub uses the PLT, so we | |
750 | need to create PLT entries for these symbols too. */ | |
751 | case R_PARISC_PCREL17F: | |
752 | case R_PARISC_PCREL22F: | |
753 | case R_PARISC_PCREL32: | |
754 | case R_PARISC_PCREL64: | |
755 | case R_PARISC_PCREL21L: | |
756 | case R_PARISC_PCREL17R: | |
757 | case R_PARISC_PCREL17C: | |
758 | case R_PARISC_PCREL14R: | |
759 | case R_PARISC_PCREL14F: | |
760 | case R_PARISC_PCREL22C: | |
761 | case R_PARISC_PCREL14WR: | |
762 | case R_PARISC_PCREL14DR: | |
763 | case R_PARISC_PCREL16F: | |
764 | case R_PARISC_PCREL16WF: | |
765 | case R_PARISC_PCREL16DF: | |
766 | need_entry = (NEED_PLT | NEED_STUB); | |
767 | break; | |
768 | ||
769 | case R_PARISC_PLTOFF21L: | |
770 | case R_PARISC_PLTOFF14R: | |
771 | case R_PARISC_PLTOFF14F: | |
772 | case R_PARISC_PLTOFF14WR: | |
773 | case R_PARISC_PLTOFF14DR: | |
774 | case R_PARISC_PLTOFF16F: | |
775 | case R_PARISC_PLTOFF16WF: | |
776 | case R_PARISC_PLTOFF16DF: | |
777 | need_entry = (NEED_PLT); | |
778 | break; | |
779 | ||
780 | case R_PARISC_DIR64: | |
781 | if (info->shared || maybe_dynamic) | |
782 | need_entry = (NEED_DYNREL); | |
783 | dynrel_type = R_PARISC_DIR64; | |
784 | break; | |
785 | ||
786 | /* This is an indirect reference through the DLT to get the address | |
787 | of a OPD descriptor. Thus we need to make a DLT entry that points | |
788 | to an OPD entry. */ | |
789 | case R_PARISC_LTOFF_FPTR21L: | |
790 | case R_PARISC_LTOFF_FPTR14R: | |
791 | case R_PARISC_LTOFF_FPTR14WR: | |
792 | case R_PARISC_LTOFF_FPTR14DR: | |
793 | case R_PARISC_LTOFF_FPTR32: | |
794 | case R_PARISC_LTOFF_FPTR64: | |
795 | case R_PARISC_LTOFF_FPTR16F: | |
796 | case R_PARISC_LTOFF_FPTR16WF: | |
797 | case R_PARISC_LTOFF_FPTR16DF: | |
798 | if (info->shared || maybe_dynamic) | |
799 | need_entry = (NEED_DLT | NEED_OPD); | |
800 | else | |
801 | need_entry = (NEED_DLT | NEED_OPD); | |
802 | dynrel_type = R_PARISC_FPTR64; | |
803 | break; | |
804 | ||
805 | /* This is a simple OPD entry. */ | |
806 | case R_PARISC_FPTR64: | |
807 | if (info->shared || maybe_dynamic) | |
808 | need_entry = (NEED_OPD | NEED_DYNREL); | |
809 | else | |
810 | need_entry = (NEED_OPD); | |
811 | dynrel_type = R_PARISC_FPTR64; | |
812 | break; | |
813 | ||
814 | /* Add more cases as needed. */ | |
815 | } | |
816 | ||
817 | if (!need_entry) | |
818 | continue; | |
819 | ||
820 | /* Collect a canonical name for this address. */ | |
821 | addr_name = get_dyn_name (abfd, h, rel, &buf, &buf_len); | |
822 | ||
823 | /* Collect the canonical entry data for this address. */ | |
824 | dyn_h = elf64_hppa_dyn_hash_lookup (&hppa_info->dyn_hash_table, | |
825 | addr_name, true, true); | |
826 | BFD_ASSERT (dyn_h); | |
827 | ||
828 | /* Stash away enough information to be able to find this symbol | |
829 | regardless of whether or not it is local or global. */ | |
830 | dyn_h->h = h; | |
831 | dyn_h->owner = abfd; | |
832 | dyn_h->sym_indx = r_symndx; | |
833 | ||
834 | /* ?!? We may need to do some error checking in here. */ | |
835 | /* Create what's needed. */ | |
836 | if (need_entry & NEED_DLT) | |
837 | { | |
838 | if (! hppa_info->dlt_sec | |
839 | && ! get_dlt (abfd, info, hppa_info)) | |
840 | goto err_out; | |
841 | dyn_h->want_dlt = 1; | |
842 | } | |
843 | ||
844 | if (need_entry & NEED_PLT) | |
845 | { | |
846 | if (! hppa_info->plt_sec | |
847 | && ! get_plt (abfd, info, hppa_info)) | |
848 | goto err_out; | |
849 | dyn_h->want_plt = 1; | |
850 | } | |
851 | ||
852 | if (need_entry & NEED_STUB) | |
853 | { | |
854 | if (! hppa_info->stub_sec | |
855 | && ! get_stub (abfd, info, hppa_info)) | |
856 | goto err_out; | |
857 | dyn_h->want_stub = 1; | |
858 | } | |
859 | ||
860 | if (need_entry & NEED_OPD) | |
861 | { | |
862 | if (! hppa_info->opd_sec | |
863 | && ! get_opd (abfd, info, hppa_info)) | |
864 | goto err_out; | |
865 | ||
866 | dyn_h->want_opd = 1; | |
867 | ||
868 | /* FPTRs are not allocated by the dynamic linker for PA64, though | |
869 | it is possible that will change in the future. */ | |
870 | ||
871 | /* This could be a local function that had its address taken, in | |
872 | which case H will be NULL. */ | |
873 | if (h) | |
874 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
875 | } | |
876 | ||
877 | /* Add a new dynamic relocation to the chain of dynamic | |
878 | relocations for this symbol. */ | |
879 | if ((need_entry & NEED_DYNREL) && (sec->flags & SEC_ALLOC)) | |
880 | { | |
881 | if (! hppa_info->other_rel_sec | |
882 | && ! get_reloc_section (abfd, hppa_info, sec)) | |
883 | goto err_out; | |
884 | ||
885 | if (!count_dyn_reloc (abfd, dyn_h, dynrel_type, sec, | |
886 | sec_symndx, rel->r_offset, rel->r_addend)) | |
887 | goto err_out; | |
888 | ||
889 | /* If we are building a shared library and we just recorded | |
890 | a dynamic R_PARISC_FPTR64 relocation, then make sure the | |
891 | section symbol for this section ends up in the dynamic | |
892 | symbol table. */ | |
893 | if (info->shared && dynrel_type == R_PARISC_FPTR64 | |
894 | && ! (_bfd_elf64_link_record_local_dynamic_symbol | |
895 | (info, abfd, sec_symndx))) | |
896 | return false; | |
897 | } | |
898 | } | |
899 | ||
900 | if (buf) | |
901 | free (buf); | |
902 | return true; | |
903 | ||
904 | err_out: | |
905 | if (buf) | |
906 | free (buf); | |
907 | return false; | |
908 | } | |
909 | ||
910 | struct elf64_hppa_allocate_data | |
911 | { | |
912 | struct bfd_link_info *info; | |
913 | bfd_size_type ofs; | |
914 | }; | |
915 | ||
916 | /* Should we do dynamic things to this symbol? */ | |
917 | ||
918 | static boolean | |
919 | elf64_hppa_dynamic_symbol_p (h, info) | |
920 | struct elf_link_hash_entry *h; | |
921 | struct bfd_link_info *info; | |
922 | { | |
923 | if (h == NULL) | |
924 | return false; | |
925 | ||
926 | while (h->root.type == bfd_link_hash_indirect | |
927 | || h->root.type == bfd_link_hash_warning) | |
928 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
929 | ||
930 | if (h->dynindx == -1) | |
931 | return false; | |
932 | ||
933 | if (h->root.type == bfd_link_hash_undefweak | |
934 | || h->root.type == bfd_link_hash_defweak) | |
935 | return true; | |
936 | ||
937 | if (h->root.root.string[0] == '$' && h->root.root.string[1] == '$') | |
938 | return false; | |
939 | ||
940 | if ((info->shared && !info->symbolic) | |
941 | || ((h->elf_link_hash_flags | |
942 | & (ELF_LINK_HASH_DEF_DYNAMIC | ELF_LINK_HASH_REF_REGULAR)) | |
943 | == (ELF_LINK_HASH_DEF_DYNAMIC | ELF_LINK_HASH_REF_REGULAR))) | |
944 | return true; | |
945 | ||
946 | return false; | |
947 | } | |
948 | ||
949 | /* Mark all funtions exported by this file so that we can later allocate | |
950 | entries in .opd for them. */ | |
951 | ||
952 | static boolean | |
953 | elf64_hppa_mark_exported_functions (h, data) | |
954 | struct elf_link_hash_entry *h; | |
955 | PTR data; | |
956 | { | |
957 | struct bfd_link_info *info = (struct bfd_link_info *)data; | |
958 | struct elf64_hppa_link_hash_table *hppa_info; | |
959 | ||
960 | hppa_info = elf64_hppa_hash_table (info); | |
961 | ||
962 | if (h | |
963 | && (h->root.type == bfd_link_hash_defined | |
964 | || h->root.type == bfd_link_hash_defweak) | |
965 | && h->root.u.def.section->output_section != NULL | |
966 | && h->type == STT_FUNC) | |
967 | { | |
968 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
969 | ||
970 | /* Add this symbol to the PA64 linker hash table. */ | |
971 | dyn_h = elf64_hppa_dyn_hash_lookup (&hppa_info->dyn_hash_table, | |
972 | h->root.root.string, true, true); | |
973 | BFD_ASSERT (dyn_h); | |
974 | dyn_h->h = h; | |
975 | ||
976 | if (! hppa_info->opd_sec | |
977 | && ! get_opd (hppa_info->root.dynobj, info, hppa_info)) | |
978 | return false; | |
979 | ||
980 | dyn_h->want_opd = 1; | |
981 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
982 | } | |
983 | ||
984 | return true; | |
985 | } | |
986 | ||
987 | /* Allocate space for a DLT entry. */ | |
988 | ||
989 | static boolean | |
990 | allocate_global_data_dlt (dyn_h, data) | |
991 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
992 | PTR data; | |
993 | { | |
994 | struct elf64_hppa_allocate_data *x = (struct elf64_hppa_allocate_data *)data; | |
995 | ||
996 | if (dyn_h->want_dlt) | |
997 | { | |
998 | struct elf_link_hash_entry *h = dyn_h->h; | |
999 | ||
1000 | if (x->info->shared) | |
1001 | { | |
1002 | /* Possibly add the symbol to the local dynamic symbol | |
1003 | table since we might need to create a dynamic relocation | |
1004 | against it. */ | |
1005 | if (! h | |
1006 | || (h && h->dynindx == -1)) | |
1007 | { | |
1008 | bfd *owner; | |
1009 | owner = (h ? h->root.u.def.section->owner : dyn_h->owner); | |
1010 | ||
1011 | if (!_bfd_elf64_link_record_local_dynamic_symbol | |
1012 | (x->info, owner, dyn_h->sym_indx)) | |
1013 | return false; | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | dyn_h->dlt_offset = x->ofs; | |
1018 | x->ofs += DLT_ENTRY_SIZE; | |
1019 | } | |
1020 | return true; | |
1021 | } | |
1022 | ||
1023 | /* Allocate space for a DLT.PLT entry. */ | |
1024 | ||
1025 | static boolean | |
1026 | allocate_global_data_plt (dyn_h, data) | |
1027 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
1028 | PTR data; | |
1029 | { | |
1030 | struct elf64_hppa_allocate_data *x = (struct elf64_hppa_allocate_data *)data; | |
1031 | ||
1032 | if (dyn_h->want_plt | |
1033 | && elf64_hppa_dynamic_symbol_p (dyn_h->h, x->info) | |
1034 | && !((dyn_h->h->root.type == bfd_link_hash_defined | |
1035 | || dyn_h->h->root.type == bfd_link_hash_defweak) | |
1036 | && dyn_h->h->root.u.def.section->output_section != NULL)) | |
1037 | { | |
1038 | dyn_h->plt_offset = x->ofs; | |
1039 | x->ofs += PLT_ENTRY_SIZE; | |
1040 | if (dyn_h->plt_offset < 0x2000) | |
1041 | elf64_hppa_hash_table (x->info)->gp_offset = dyn_h->plt_offset; | |
1042 | } | |
1043 | else | |
1044 | dyn_h->want_plt = 0; | |
1045 | ||
1046 | return true; | |
1047 | } | |
1048 | ||
1049 | /* Allocate space for a STUB entry. */ | |
1050 | ||
1051 | static boolean | |
1052 | allocate_global_data_stub (dyn_h, data) | |
1053 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
1054 | PTR data; | |
1055 | { | |
1056 | struct elf64_hppa_allocate_data *x = (struct elf64_hppa_allocate_data *)data; | |
1057 | ||
1058 | if (dyn_h->want_stub | |
1059 | && elf64_hppa_dynamic_symbol_p (dyn_h->h, x->info) | |
1060 | && !((dyn_h->h->root.type == bfd_link_hash_defined | |
1061 | || dyn_h->h->root.type == bfd_link_hash_defweak) | |
1062 | && dyn_h->h->root.u.def.section->output_section != NULL)) | |
1063 | { | |
1064 | dyn_h->stub_offset = x->ofs; | |
1065 | x->ofs += sizeof (plt_stub); | |
1066 | } | |
1067 | else | |
1068 | dyn_h->want_stub = 0; | |
1069 | return true; | |
1070 | } | |
1071 | ||
1072 | /* Allocate space for a FPTR entry. */ | |
1073 | ||
1074 | static boolean | |
1075 | allocate_global_data_opd (dyn_h, data) | |
1076 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
1077 | PTR data; | |
1078 | { | |
1079 | struct elf64_hppa_allocate_data *x = (struct elf64_hppa_allocate_data *)data; | |
1080 | ||
1081 | if (dyn_h->want_opd) | |
1082 | { | |
1083 | struct elf_link_hash_entry *h = dyn_h->h; | |
1084 | ||
1085 | if (h) | |
1086 | while (h->root.type == bfd_link_hash_indirect | |
1087 | || h->root.type == bfd_link_hash_warning) | |
1088 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1089 | ||
1090 | /* We never need an opd entry for a symbol which is not | |
1091 | defined by this output file. */ | |
1092 | if (h && h->root.type == bfd_link_hash_undefined) | |
1093 | dyn_h->want_opd = 0; | |
1094 | ||
1095 | /* If we are creating a shared library, took the address of a local | |
1096 | function or might export this function from this object file, then | |
1097 | we have to create an opd descriptor. */ | |
1098 | else if (x->info->shared | |
1099 | || h == NULL | |
1100 | || h->dynindx == -1 | |
1101 | || ((h->root.type == bfd_link_hash_defined | |
1102 | || h->root.type == bfd_link_hash_defweak) | |
1103 | && h->root.u.def.section->output_section != NULL)) | |
1104 | { | |
1105 | /* If we are creating a shared library, then we will have to | |
1106 | create a runtime relocation for the symbol to properly | |
1107 | initialize the .opd entry. Make sure the symbol gets | |
1108 | added to the dynamic symbol table. */ | |
1109 | if (x->info->shared | |
1110 | && (h == NULL || (h->dynindx == -1))) | |
1111 | { | |
1112 | bfd *owner; | |
1113 | owner = (h ? h->root.u.def.section->owner : dyn_h->owner); | |
1114 | ||
1115 | if (!_bfd_elf64_link_record_local_dynamic_symbol | |
1116 | (x->info, owner, dyn_h->sym_indx)) | |
1117 | return false; | |
1118 | } | |
1119 | ||
1120 | /* This may not be necessary or desirable anymore now that | |
1121 | we have some support for dealing with section symbols | |
1122 | in dynamic relocs. But name munging does make the result | |
1123 | much easier to debug. ie, the EPLT reloc will reference | |
1124 | a symbol like .foobar, instead of .text + offset. */ | |
1125 | if (x->info->shared && h) | |
1126 | { | |
1127 | char *new_name; | |
1128 | struct elf_link_hash_entry *nh; | |
1129 | ||
1130 | new_name = alloca (strlen (h->root.root.string) + 2); | |
1131 | new_name[0] = '.'; | |
1132 | strcpy (new_name + 1, h->root.root.string); | |
1133 | ||
1134 | nh = elf_link_hash_lookup (elf_hash_table (x->info), | |
1135 | new_name, true, true, true); | |
1136 | ||
1137 | nh->root.type = h->root.type; | |
1138 | nh->root.u.def.value = h->root.u.def.value; | |
1139 | nh->root.u.def.section = h->root.u.def.section; | |
1140 | ||
1141 | if (! bfd_elf64_link_record_dynamic_symbol (x->info, nh)) | |
1142 | return false; | |
1143 | ||
1144 | } | |
1145 | dyn_h->opd_offset = x->ofs; | |
1146 | x->ofs += OPD_ENTRY_SIZE; | |
1147 | } | |
1148 | ||
1149 | /* Otherwise we do not need an opd entry. */ | |
1150 | else | |
1151 | dyn_h->want_opd = 0; | |
1152 | } | |
1153 | return true; | |
1154 | } | |
1155 | ||
1156 | /* HP requires the EI_OSABI field to be filled in. The assignment to | |
1157 | EI_ABIVERSION may not be strictly necessary. */ | |
1158 | ||
1159 | static void | |
1160 | elf64_hppa_post_process_headers (abfd, link_info) | |
1161 | bfd * abfd; | |
1162 | struct bfd_link_info * link_info ATTRIBUTE_UNUSED; | |
1163 | { | |
1164 | Elf_Internal_Ehdr * i_ehdrp; | |
1165 | ||
1166 | i_ehdrp = elf_elfheader (abfd); | |
1167 | ||
1168 | i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_HPUX; | |
1169 | i_ehdrp->e_ident[EI_ABIVERSION] = 1; | |
1170 | } | |
1171 | ||
1172 | /* Create function descriptor section (.opd). This section is called .opd | |
1173 | because it contains "official prodecure descriptors". The "official" | |
1174 | refers to the fact that these descriptors are used when taking the address | |
1175 | of a procedure, thus ensuring a unique address for each procedure. */ | |
1176 | ||
1177 | static boolean | |
1178 | get_opd (abfd, info, hppa_info) | |
1179 | bfd *abfd; | |
1180 | struct bfd_link_info *info; | |
1181 | struct elf64_hppa_link_hash_table *hppa_info; | |
1182 | { | |
1183 | asection *opd; | |
1184 | bfd *dynobj; | |
1185 | ||
1186 | opd = hppa_info->opd_sec; | |
1187 | if (!opd) | |
1188 | { | |
1189 | dynobj = hppa_info->root.dynobj; | |
1190 | if (!dynobj) | |
1191 | hppa_info->root.dynobj = dynobj = abfd; | |
1192 | ||
1193 | opd = bfd_make_section (dynobj, ".opd"); | |
1194 | if (!opd | |
1195 | || !bfd_set_section_flags (dynobj, opd, | |
1196 | (SEC_ALLOC | |
1197 | | SEC_LOAD | |
1198 | | SEC_HAS_CONTENTS | |
1199 | | SEC_IN_MEMORY | |
1200 | | SEC_LINKER_CREATED)) | |
1201 | || !bfd_set_section_alignment (abfd, opd, 3)) | |
1202 | { | |
1203 | BFD_ASSERT (0); | |
1204 | return false; | |
1205 | } | |
1206 | ||
1207 | hppa_info->opd_sec = opd; | |
1208 | } | |
1209 | ||
1210 | return true; | |
1211 | } | |
1212 | ||
1213 | /* Create the PLT section. */ | |
1214 | ||
1215 | static boolean | |
1216 | get_plt (abfd, info, hppa_info) | |
1217 | bfd *abfd; | |
1218 | struct bfd_link_info *info; | |
1219 | struct elf64_hppa_link_hash_table *hppa_info; | |
1220 | { | |
1221 | asection *plt; | |
1222 | bfd *dynobj; | |
1223 | ||
1224 | plt = hppa_info->plt_sec; | |
1225 | if (!plt) | |
1226 | { | |
1227 | dynobj = hppa_info->root.dynobj; | |
1228 | if (!dynobj) | |
1229 | hppa_info->root.dynobj = dynobj = abfd; | |
1230 | ||
1231 | plt = bfd_make_section (dynobj, ".plt"); | |
1232 | if (!plt | |
1233 | || !bfd_set_section_flags (dynobj, plt, | |
1234 | (SEC_ALLOC | |
1235 | | SEC_LOAD | |
1236 | | SEC_HAS_CONTENTS | |
1237 | | SEC_IN_MEMORY | |
1238 | | SEC_LINKER_CREATED)) | |
1239 | || !bfd_set_section_alignment (abfd, plt, 3)) | |
1240 | { | |
1241 | BFD_ASSERT (0); | |
1242 | return false; | |
1243 | } | |
1244 | ||
1245 | hppa_info->plt_sec = plt; | |
1246 | } | |
1247 | ||
1248 | return true; | |
1249 | } | |
1250 | ||
1251 | /* Create the DLT section. */ | |
1252 | ||
1253 | static boolean | |
1254 | get_dlt (abfd, info, hppa_info) | |
1255 | bfd *abfd; | |
1256 | struct bfd_link_info *info; | |
1257 | struct elf64_hppa_link_hash_table *hppa_info; | |
1258 | { | |
1259 | asection *dlt; | |
1260 | bfd *dynobj; | |
1261 | ||
1262 | dlt = hppa_info->dlt_sec; | |
1263 | if (!dlt) | |
1264 | { | |
1265 | dynobj = hppa_info->root.dynobj; | |
1266 | if (!dynobj) | |
1267 | hppa_info->root.dynobj = dynobj = abfd; | |
1268 | ||
1269 | dlt = bfd_make_section (dynobj, ".dlt"); | |
1270 | if (!dlt | |
1271 | || !bfd_set_section_flags (dynobj, dlt, | |
1272 | (SEC_ALLOC | |
1273 | | SEC_LOAD | |
1274 | | SEC_HAS_CONTENTS | |
1275 | | SEC_IN_MEMORY | |
1276 | | SEC_LINKER_CREATED)) | |
1277 | || !bfd_set_section_alignment (abfd, dlt, 3)) | |
1278 | { | |
1279 | BFD_ASSERT (0); | |
1280 | return false; | |
1281 | } | |
1282 | ||
1283 | hppa_info->dlt_sec = dlt; | |
1284 | } | |
1285 | ||
1286 | return true; | |
1287 | } | |
1288 | ||
1289 | /* Create the stubs section. */ | |
1290 | ||
1291 | static boolean | |
1292 | get_stub (abfd, info, hppa_info) | |
1293 | bfd *abfd; | |
1294 | struct bfd_link_info *info; | |
1295 | struct elf64_hppa_link_hash_table *hppa_info; | |
1296 | { | |
1297 | asection *stub; | |
1298 | bfd *dynobj; | |
1299 | ||
1300 | stub = hppa_info->stub_sec; | |
1301 | if (!stub) | |
1302 | { | |
1303 | dynobj = hppa_info->root.dynobj; | |
1304 | if (!dynobj) | |
1305 | hppa_info->root.dynobj = dynobj = abfd; | |
1306 | ||
1307 | stub = bfd_make_section (dynobj, ".stub"); | |
1308 | if (!stub | |
1309 | || !bfd_set_section_flags (dynobj, stub, | |
1310 | (SEC_ALLOC | |
1311 | | SEC_LOAD | |
1312 | | SEC_HAS_CONTENTS | |
1313 | | SEC_IN_MEMORY | |
1314 | | SEC_READONLY | |
1315 | | SEC_LINKER_CREATED)) | |
1316 | || !bfd_set_section_alignment (abfd, stub, 3)) | |
1317 | { | |
1318 | BFD_ASSERT (0); | |
1319 | return false; | |
1320 | } | |
1321 | ||
1322 | hppa_info->stub_sec = stub; | |
1323 | } | |
1324 | ||
1325 | return true; | |
1326 | } | |
1327 | ||
1328 | /* Create sections necessary for dynamic linking. This is only a rough | |
1329 | cut and will likely change as we learn more about the somewhat | |
1330 | unusual dynamic linking scheme HP uses. | |
1331 | ||
1332 | .stub: | |
1333 | Contains code to implement cross-space calls. The first time one | |
1334 | of the stubs is used it will call into the dynamic linker, later | |
1335 | calls will go straight to the target. | |
1336 | ||
1337 | The only stub we support right now looks like | |
1338 | ||
1339 | ldd OFFSET(%dp),%r1 | |
1340 | bve %r0(%r1) | |
1341 | ldd OFFSET+8(%dp),%dp | |
1342 | ||
1343 | Other stubs may be needed in the future. We may want the remove | |
1344 | the break/nop instruction. It is only used right now to keep the | |
1345 | offset of a .plt entry and a .stub entry in sync. | |
1346 | ||
1347 | .dlt: | |
1348 | This is what most people call the .got. HP used a different name. | |
1349 | Losers. | |
1350 | ||
1351 | .rela.dlt: | |
1352 | Relocations for the DLT. | |
1353 | ||
1354 | .plt: | |
1355 | Function pointers as address,gp pairs. | |
1356 | ||
1357 | .rela.plt: | |
1358 | Should contain dynamic IPLT (and EPLT?) relocations. | |
1359 | ||
1360 | .opd: | |
1361 | FPTRS | |
1362 | ||
1363 | .rela.opd: | |
1364 | EPLT relocations for symbols exported from shared libraries. */ | |
1365 | ||
1366 | static boolean | |
1367 | elf64_hppa_create_dynamic_sections (abfd, info) | |
1368 | bfd *abfd; | |
1369 | struct bfd_link_info *info; | |
1370 | { | |
1371 | asection *s; | |
1372 | ||
1373 | if (! get_stub (abfd, info, elf64_hppa_hash_table (info))) | |
1374 | return false; | |
1375 | ||
1376 | if (! get_dlt (abfd, info, elf64_hppa_hash_table (info))) | |
1377 | return false; | |
1378 | ||
1379 | if (! get_plt (abfd, info, elf64_hppa_hash_table (info))) | |
1380 | return false; | |
1381 | ||
1382 | if (! get_opd (abfd, info, elf64_hppa_hash_table (info))) | |
1383 | return false; | |
1384 | ||
1385 | s = bfd_make_section(abfd, ".rela.dlt"); | |
1386 | if (s == NULL | |
1387 | || !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1388 | | SEC_HAS_CONTENTS | |
1389 | | SEC_IN_MEMORY | |
1390 | | SEC_READONLY | |
1391 | | SEC_LINKER_CREATED)) | |
1392 | || !bfd_set_section_alignment (abfd, s, 3)) | |
1393 | return false; | |
1394 | elf64_hppa_hash_table (info)->dlt_rel_sec = s; | |
1395 | ||
1396 | s = bfd_make_section(abfd, ".rela.plt"); | |
1397 | if (s == NULL | |
1398 | || !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1399 | | SEC_HAS_CONTENTS | |
1400 | | SEC_IN_MEMORY | |
1401 | | SEC_READONLY | |
1402 | | SEC_LINKER_CREATED)) | |
1403 | || !bfd_set_section_alignment (abfd, s, 3)) | |
1404 | return false; | |
1405 | elf64_hppa_hash_table (info)->plt_rel_sec = s; | |
1406 | ||
1407 | s = bfd_make_section(abfd, ".rela.data"); | |
1408 | if (s == NULL | |
1409 | || !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1410 | | SEC_HAS_CONTENTS | |
1411 | | SEC_IN_MEMORY | |
1412 | | SEC_READONLY | |
1413 | | SEC_LINKER_CREATED)) | |
1414 | || !bfd_set_section_alignment (abfd, s, 3)) | |
1415 | return false; | |
1416 | elf64_hppa_hash_table (info)->other_rel_sec = s; | |
1417 | ||
1418 | s = bfd_make_section(abfd, ".rela.opd"); | |
1419 | if (s == NULL | |
1420 | || !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1421 | | SEC_HAS_CONTENTS | |
1422 | | SEC_IN_MEMORY | |
1423 | | SEC_READONLY | |
1424 | | SEC_LINKER_CREATED)) | |
1425 | || !bfd_set_section_alignment (abfd, s, 3)) | |
1426 | return false; | |
1427 | elf64_hppa_hash_table (info)->opd_rel_sec = s; | |
1428 | ||
1429 | return true; | |
1430 | } | |
1431 | ||
1432 | /* Allocate dynamic relocations for those symbols that turned out | |
1433 | to be dynamic. */ | |
1434 | ||
1435 | static boolean | |
1436 | allocate_dynrel_entries (dyn_h, data) | |
1437 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
1438 | PTR data; | |
1439 | { | |
1440 | struct elf64_hppa_allocate_data *x = (struct elf64_hppa_allocate_data *)data; | |
1441 | struct elf64_hppa_link_hash_table *hppa_info; | |
1442 | struct elf64_hppa_dyn_reloc_entry *rent; | |
1443 | boolean dynamic_symbol, shared; | |
1444 | ||
1445 | hppa_info = elf64_hppa_hash_table (x->info); | |
1446 | dynamic_symbol = elf64_hppa_dynamic_symbol_p (dyn_h->h, x->info); | |
1447 | shared = x->info->shared; | |
1448 | ||
1449 | /* We may need to allocate relocations for a non-dynamic symbol | |
1450 | when creating a shared library. */ | |
1451 | if (!dynamic_symbol && !shared) | |
1452 | return true; | |
1453 | ||
1454 | /* Take care of the normal data relocations. */ | |
1455 | ||
1456 | for (rent = dyn_h->reloc_entries; rent; rent = rent->next) | |
1457 | { | |
1458 | switch (rent->type) | |
1459 | { | |
1460 | case R_PARISC_FPTR64: | |
1461 | /* Allocate one iff we are not building a shared library and | |
1462 | !want_opd, which by this point will be true only if we're | |
1463 | actually allocating one statically in the main executable. */ | |
1464 | if (!x->info->shared && dyn_h->want_opd) | |
1465 | continue; | |
1466 | break; | |
1467 | } | |
1468 | hppa_info->other_rel_sec->_raw_size += sizeof (Elf64_External_Rela); | |
1469 | ||
1470 | /* Make sure this symbol gets into the dynamic symbol table if it is | |
1471 | not already recorded. ?!? This should not be in the loop since | |
1472 | the symbol need only be added once. */ | |
1473 | if (dyn_h->h == 0 || dyn_h->h->dynindx == -1) | |
1474 | if (!_bfd_elf64_link_record_local_dynamic_symbol | |
1475 | (x->info, rent->sec->owner, dyn_h->sym_indx)) | |
1476 | return false; | |
1477 | } | |
1478 | ||
1479 | /* Take care of the GOT and PLT relocations. */ | |
1480 | ||
1481 | if ((dynamic_symbol || shared) && dyn_h->want_dlt) | |
1482 | hppa_info->dlt_rel_sec->_raw_size += sizeof (Elf64_External_Rela); | |
1483 | ||
1484 | /* If we are building a shared library, then every symbol that has an | |
1485 | opd entry will need an EPLT relocation to relocate the symbol's address | |
1486 | and __gp value based on the runtime load address. */ | |
1487 | if (shared && dyn_h->want_opd) | |
1488 | hppa_info->opd_rel_sec->_raw_size += sizeof (Elf64_External_Rela); | |
1489 | ||
1490 | if (dyn_h->want_plt && dynamic_symbol) | |
1491 | { | |
1492 | bfd_size_type t = 0; | |
1493 | ||
1494 | /* Dynamic symbols get one IPLT relocation. Local symbols in | |
1495 | shared libraries get two REL relocations. Local symbols in | |
1496 | main applications get nothing. */ | |
1497 | if (dynamic_symbol) | |
1498 | t = sizeof (Elf64_External_Rela); | |
1499 | else if (shared) | |
1500 | t = 2 * sizeof (Elf64_External_Rela); | |
1501 | ||
1502 | hppa_info->plt_rel_sec->_raw_size += t; | |
1503 | } | |
1504 | ||
1505 | return true; | |
1506 | } | |
1507 | ||
1508 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
1509 | regular object. */ | |
1510 | ||
1511 | static boolean | |
1512 | elf64_hppa_adjust_dynamic_symbol (info, h) | |
1513 | struct bfd_link_info *info; | |
1514 | struct elf_link_hash_entry *h; | |
1515 | { | |
1516 | /* ??? Undefined symbols with PLT entries should be re-defined | |
1517 | to be the PLT entry. */ | |
1518 | ||
1519 | /* If this is a weak symbol, and there is a real definition, the | |
1520 | processor independent code will have arranged for us to see the | |
1521 | real definition first, and we can just use the same value. */ | |
1522 | if (h->weakdef != NULL) | |
1523 | { | |
1524 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
1525 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
1526 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
1527 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
1528 | return true; | |
1529 | } | |
1530 | ||
1531 | /* If this is a reference to a symbol defined by a dynamic object which | |
1532 | is not a function, we might allocate the symbol in our .dynbss section | |
1533 | and allocate a COPY dynamic relocation. | |
1534 | ||
1535 | But PA64 code is canonically PIC, so as a rule we can avoid this sort | |
1536 | of hackery. */ | |
1537 | ||
1538 | return true; | |
1539 | } | |
1540 | ||
1541 | /* Set the final sizes of the dynamic sections and allocate memory for | |
1542 | the contents of our special sections. */ | |
1543 | ||
1544 | static boolean | |
1545 | elf64_hppa_size_dynamic_sections (output_bfd, info) | |
1546 | bfd *output_bfd; | |
1547 | struct bfd_link_info *info; | |
1548 | { | |
1549 | bfd *dynobj; | |
1550 | asection *s; | |
1551 | boolean plt; | |
1552 | boolean relocs; | |
1553 | boolean reltext; | |
1554 | boolean stubs; | |
1555 | struct elf64_hppa_allocate_data data; | |
1556 | struct elf64_hppa_link_hash_table *hppa_info; | |
1557 | ||
1558 | hppa_info = elf64_hppa_hash_table (info); | |
1559 | ||
1560 | dynobj = elf_hash_table (info)->dynobj; | |
1561 | BFD_ASSERT (dynobj != NULL); | |
1562 | ||
1563 | if (elf_hash_table (info)->dynamic_sections_created) | |
1564 | { | |
1565 | /* Set the contents of the .interp section to the interpreter. */ | |
1566 | if (! info->shared) | |
1567 | { | |
1568 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
1569 | BFD_ASSERT (s != NULL); | |
1570 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
1571 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
1572 | } | |
1573 | } | |
1574 | else | |
1575 | { | |
1576 | /* We may have created entries in the .rela.got section. | |
1577 | However, if we are not creating the dynamic sections, we will | |
1578 | not actually use these entries. Reset the size of .rela.dlt, | |
1579 | which will cause it to get stripped from the output file | |
1580 | below. */ | |
1581 | s = bfd_get_section_by_name (dynobj, ".rela.dlt"); | |
1582 | if (s != NULL) | |
1583 | s->_raw_size = 0; | |
1584 | } | |
1585 | ||
1586 | /* Allocate the GOT entries. */ | |
1587 | ||
1588 | data.info = info; | |
1589 | if (elf64_hppa_hash_table (info)->dlt_sec) | |
1590 | { | |
1591 | data.ofs = 0x0; | |
1592 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
1593 | allocate_global_data_dlt, &data); | |
1594 | hppa_info->dlt_sec->_raw_size = data.ofs; | |
1595 | ||
1596 | data.ofs = 0x0; | |
1597 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
1598 | allocate_global_data_plt, &data); | |
1599 | hppa_info->plt_sec->_raw_size = data.ofs; | |
1600 | ||
1601 | data.ofs = 0x0; | |
1602 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
1603 | allocate_global_data_stub, &data); | |
1604 | hppa_info->stub_sec->_raw_size = data.ofs; | |
1605 | } | |
1606 | ||
1607 | /* Mark each function this program exports so that we will allocate | |
1608 | space in the .opd section for each function's FPTR. | |
1609 | ||
1610 | We have to traverse the main linker hash table since we have to | |
1611 | find functions which may not have been mentioned in any relocs. */ | |
1612 | elf_link_hash_traverse (elf_hash_table (info), | |
1613 | elf64_hppa_mark_exported_functions, | |
1614 | info); | |
1615 | ||
1616 | /* Allocate space for entries in the .opd section. */ | |
1617 | if (elf64_hppa_hash_table (info)->opd_sec) | |
1618 | { | |
1619 | data.ofs = 0; | |
1620 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
1621 | allocate_global_data_opd, &data); | |
1622 | hppa_info->opd_sec->_raw_size = data.ofs; | |
1623 | } | |
1624 | ||
1625 | /* Now allocate space for dynamic relocations, if necessary. */ | |
1626 | if (hppa_info->root.dynamic_sections_created) | |
1627 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
1628 | allocate_dynrel_entries, &data); | |
1629 | ||
1630 | /* The sizes of all the sections are set. Allocate memory for them. */ | |
1631 | plt = false; | |
1632 | relocs = false; | |
1633 | reltext = false; | |
1634 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1635 | { | |
1636 | const char *name; | |
1637 | boolean strip; | |
1638 | ||
1639 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1640 | continue; | |
1641 | ||
1642 | /* It's OK to base decisions on the section name, because none | |
1643 | of the dynobj section names depend upon the input files. */ | |
1644 | name = bfd_get_section_name (dynobj, s); | |
1645 | ||
1646 | strip = 0; | |
1647 | ||
1648 | if (strcmp (name, ".plt") == 0) | |
1649 | { | |
1650 | if (s->_raw_size == 0) | |
1651 | { | |
1652 | /* Strip this section if we don't need it; see the | |
1653 | comment below. */ | |
1654 | strip = true; | |
1655 | } | |
1656 | else | |
1657 | { | |
1658 | /* Remember whether there is a PLT. */ | |
1659 | plt = true; | |
1660 | } | |
1661 | } | |
1662 | else if (strcmp (name, ".dlt") == 0) | |
1663 | { | |
1664 | if (s->_raw_size == 0) | |
1665 | { | |
1666 | /* Strip this section if we don't need it; see the | |
1667 | comment below. */ | |
1668 | strip = true; | |
1669 | } | |
1670 | } | |
1671 | else if (strcmp (name, ".opd") == 0) | |
1672 | { | |
1673 | if (s->_raw_size == 0) | |
1674 | { | |
1675 | /* Strip this section if we don't need it; see the | |
1676 | comment below. */ | |
1677 | strip = true; | |
1678 | } | |
1679 | } | |
1680 | else if (strncmp (name, ".rela", 4) == 0) | |
1681 | { | |
1682 | if (s->_raw_size == 0) | |
1683 | { | |
1684 | /* If we don't need this section, strip it from the | |
1685 | output file. This is mostly to handle .rela.bss and | |
1686 | .rela.plt. We must create both sections in | |
1687 | create_dynamic_sections, because they must be created | |
1688 | before the linker maps input sections to output | |
1689 | sections. The linker does that before | |
1690 | adjust_dynamic_symbol is called, and it is that | |
1691 | function which decides whether anything needs to go | |
1692 | into these sections. */ | |
1693 | strip = true; | |
1694 | } | |
1695 | else | |
1696 | { | |
1697 | asection *target; | |
1698 | ||
1699 | /* Remember whether there are any reloc sections other | |
1700 | than .rela.plt. */ | |
1701 | if (strcmp (name, ".rela.plt") != 0) | |
1702 | { | |
1703 | const char *outname; | |
1704 | ||
1705 | relocs = true; | |
1706 | ||
1707 | /* If this relocation section applies to a read only | |
1708 | section, then we probably need a DT_TEXTREL | |
1709 | entry. The entries in the .rela.plt section | |
1710 | really apply to the .got section, which we | |
1711 | created ourselves and so know is not readonly. */ | |
1712 | outname = bfd_get_section_name (output_bfd, | |
1713 | s->output_section); | |
1714 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
1715 | if (target != NULL | |
1716 | && (target->flags & SEC_READONLY) != 0 | |
1717 | && (target->flags & SEC_ALLOC) != 0) | |
1718 | reltext = true; | |
1719 | } | |
1720 | ||
1721 | /* We use the reloc_count field as a counter if we need | |
1722 | to copy relocs into the output file. */ | |
1723 | s->reloc_count = 0; | |
1724 | } | |
1725 | } | |
1726 | else if (strncmp (name, ".dlt", 4) != 0 | |
1727 | && strcmp (name, ".stub") != 0 | |
1728 | && strcmp (name, ".got") != 0) | |
1729 | { | |
1730 | /* It's not one of our sections, so don't allocate space. */ | |
1731 | continue; | |
1732 | } | |
1733 | ||
1734 | if (strip) | |
1735 | { | |
1736 | _bfd_strip_section_from_output (info, s); | |
1737 | continue; | |
1738 | } | |
1739 | ||
1740 | /* Allocate memory for the section contents if it has not | |
1741 | been allocated already. */ | |
1742 | if (s->contents == NULL) | |
1743 | { | |
1744 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); | |
1745 | if (s->contents == NULL && s->_raw_size != 0) | |
1746 | return false; | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | if (elf_hash_table (info)->dynamic_sections_created) | |
1751 | { | |
1752 | /* Always create a DT_PLTGOT. It actually has nothing to do with | |
1753 | the PLT, it is how we communicate the __gp value of a load | |
1754 | module to the dynamic linker. */ | |
1755 | if (! bfd_elf64_add_dynamic_entry (info, DT_HP_DLD_FLAGS, 0) | |
1756 | || ! bfd_elf64_add_dynamic_entry (info, DT_PLTGOT, 0)) | |
1757 | return false; | |
1758 | ||
1759 | /* Add some entries to the .dynamic section. We fill in the | |
1760 | values later, in elf64_hppa_finish_dynamic_sections, but we | |
1761 | must add the entries now so that we get the correct size for | |
1762 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1763 | dynamic linker and used by the debugger. */ | |
1764 | if (! info->shared) | |
1765 | { | |
1766 | if (! bfd_elf64_add_dynamic_entry (info, DT_DEBUG, 0) | |
1767 | || ! bfd_elf64_add_dynamic_entry (info, DT_HP_DLD_HOOK, 0) | |
1768 | || ! bfd_elf64_add_dynamic_entry (info, DT_HP_LOAD_MAP, 0)) | |
1769 | return false; | |
1770 | } | |
1771 | ||
1772 | if (plt) | |
1773 | { | |
1774 | if (! bfd_elf64_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
1775 | || ! bfd_elf64_add_dynamic_entry (info, DT_PLTREL, DT_RELA) | |
1776 | || ! bfd_elf64_add_dynamic_entry (info, DT_JMPREL, 0)) | |
1777 | return false; | |
1778 | } | |
1779 | ||
1780 | if (relocs) | |
1781 | { | |
1782 | if (! bfd_elf64_add_dynamic_entry (info, DT_RELA, 0) | |
1783 | || ! bfd_elf64_add_dynamic_entry (info, DT_RELASZ, 0) | |
1784 | || ! bfd_elf64_add_dynamic_entry (info, DT_RELAENT, | |
1785 | sizeof (Elf64_External_Rela))) | |
1786 | return false; | |
1787 | } | |
1788 | ||
1789 | if (reltext) | |
1790 | { | |
1791 | if (! bfd_elf64_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
1792 | return false; | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | return true; | |
1797 | } | |
1798 | ||
1799 | /* Called after we have output the symbol into the dynamic symbol | |
1800 | table, but before we output the symbol into the normal symbol | |
1801 | table. | |
1802 | ||
1803 | For some symbols we had to change their address when outputting | |
1804 | the dynamic symbol table. We undo that change here so that | |
1805 | the symbols have their expected value in the normal symbol | |
1806 | table. Ick. */ | |
1807 | ||
1808 | static boolean | |
1809 | elf64_hppa_link_output_symbol_hook (abfd, info, name, sym, input_sec) | |
1810 | bfd *abfd; | |
1811 | struct bfd_link_info *info; | |
1812 | const char *name; | |
1813 | Elf_Internal_Sym *sym; | |
1814 | asection *input_sec; | |
1815 | { | |
1816 | struct elf64_hppa_link_hash_table *hppa_info; | |
1817 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
1818 | ||
1819 | /* We may be called with the file symbol or section symbols. | |
1820 | They never need munging, so it is safe to ignore them. */ | |
1821 | if (!name) | |
1822 | return true; | |
1823 | ||
1824 | /* Get the PA dyn_symbol (if any) associated with NAME. */ | |
1825 | hppa_info = elf64_hppa_hash_table (info); | |
1826 | dyn_h = elf64_hppa_dyn_hash_lookup (&hppa_info->dyn_hash_table, | |
1827 | name, false, false); | |
1828 | ||
1829 | /* Function symbols for which we created .opd entries were munged | |
1830 | by finish_dynamic_symbol and have to be un-munged here. */ | |
1831 | if (dyn_h && dyn_h->want_opd) | |
1832 | { | |
1833 | /* Restore the saved value and section index. */ | |
1834 | sym->st_value = dyn_h->st_value; | |
1835 | sym->st_shndx = dyn_h->st_shndx; | |
1836 | } | |
1837 | ||
1838 | return true; | |
1839 | } | |
1840 | ||
1841 | /* Finish up dynamic symbol handling. We set the contents of various | |
1842 | dynamic sections here. */ | |
1843 | ||
1844 | static boolean | |
1845 | elf64_hppa_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1846 | bfd *output_bfd; | |
1847 | struct bfd_link_info *info; | |
1848 | struct elf_link_hash_entry *h; | |
1849 | Elf_Internal_Sym *sym; | |
1850 | { | |
1851 | asection *stub, *splt, *sdlt, *sopd, *spltrel, *sdltrel; | |
1852 | struct elf64_hppa_link_hash_table *hppa_info; | |
1853 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
1854 | ||
1855 | hppa_info = elf64_hppa_hash_table (info); | |
1856 | dyn_h = elf64_hppa_dyn_hash_lookup (&hppa_info->dyn_hash_table, | |
1857 | h->root.root.string, false, false); | |
1858 | ||
1859 | stub = hppa_info->stub_sec; | |
1860 | splt = hppa_info->plt_sec; | |
1861 | sdlt = hppa_info->dlt_sec; | |
1862 | sopd = hppa_info->opd_sec; | |
1863 | spltrel = hppa_info->plt_rel_sec; | |
1864 | sdltrel = hppa_info->dlt_rel_sec; | |
1865 | ||
1866 | BFD_ASSERT (stub != NULL && splt != NULL | |
1867 | && sopd != NULL && sdlt != NULL) | |
1868 | ||
1869 | /* Incredible. It is actually necessary to NOT use the symbol's real | |
1870 | value when building the dynamic symbol table for a shared library. | |
1871 | At least for symbols that refer to functions. | |
1872 | ||
1873 | We will store a new value and section index into the symbol long | |
1874 | enough to output it into the dynamic symbol table, then we restore | |
1875 | the original values (in elf64_hppa_link_output_symbol_hook). */ | |
1876 | if (dyn_h && dyn_h->want_opd) | |
1877 | { | |
1878 | /* Save away the original value and section index so that we | |
1879 | can restore them later. */ | |
1880 | dyn_h->st_value = sym->st_value; | |
1881 | dyn_h->st_shndx = sym->st_shndx; | |
1882 | ||
1883 | /* For the dynamic symbol table entry, we want the value to be | |
1884 | address of this symbol's entry within the .opd section. */ | |
1885 | sym->st_value = (dyn_h->opd_offset | |
1886 | + sopd->output_offset | |
1887 | + sopd->output_section->vma); | |
1888 | sym->st_shndx = _bfd_elf_section_from_bfd_section (output_bfd, | |
1889 | sopd->output_section); | |
1890 | } | |
1891 | ||
1892 | /* Initialize a .plt entry if requested. */ | |
1893 | if (dyn_h && dyn_h->want_plt | |
1894 | && elf64_hppa_dynamic_symbol_p (dyn_h->h, info)) | |
1895 | { | |
1896 | bfd_vma value; | |
1897 | Elf_Internal_Rela rel; | |
1898 | ||
1899 | /* We do not actually care about the value in the PLT entry | |
1900 | if we are creating a shared library and the symbol is | |
1901 | still undefined, we create a dynamic relocation to fill | |
1902 | in the correct value. */ | |
1903 | if (info->shared && h->root.type == bfd_link_hash_undefined) | |
1904 | value = 0; | |
1905 | else | |
1906 | value = (h->root.u.def.value + h->root.u.def.section->vma); | |
1907 | ||
1908 | /* Fill in the entry in the procedure linkage table. | |
1909 | ||
1910 | The format of a plt entry is | |
1911 | <funcaddr> <__gp>. | |
1912 | ||
1913 | plt_offset is the offset within the PLT section at which to | |
1914 | install the PLT entry. | |
1915 | ||
1916 | We are modifying the in-memory PLT contents here, so we do not add | |
1917 | in the output_offset of the PLT section. */ | |
1918 | ||
1919 | bfd_put_64 (splt->owner, value, splt->contents + dyn_h->plt_offset); | |
1920 | value = _bfd_get_gp_value (splt->output_section->owner); | |
1921 | bfd_put_64 (splt->owner, value, splt->contents + dyn_h->plt_offset + 0x8); | |
1922 | ||
1923 | /* Create a dynamic IPLT relocation for this entry. | |
1924 | ||
1925 | We are creating a relocation in the output file's PLT section, | |
1926 | which is included within the DLT secton. So we do need to include | |
1927 | the PLT's output_offset in the computation of the relocation's | |
1928 | address. */ | |
1929 | rel.r_offset = (dyn_h->plt_offset + splt->output_offset | |
1930 | + splt->output_section->vma); | |
1931 | rel.r_info = ELF64_R_INFO (h->dynindx, R_PARISC_IPLT); | |
1932 | rel.r_addend = 0; | |
1933 | ||
1934 | bfd_elf64_swap_reloca_out (splt->output_section->owner, &rel, | |
1935 | (((Elf64_External_Rela *) | |
1936 | spltrel->contents) | |
1937 | + spltrel->reloc_count)); | |
1938 | spltrel->reloc_count++; | |
1939 | } | |
1940 | ||
1941 | /* Initialize an external call stub entry if requested. */ | |
1942 | if (dyn_h && dyn_h->want_stub | |
1943 | && elf64_hppa_dynamic_symbol_p (dyn_h->h, info)) | |
1944 | { | |
1945 | bfd_vma value; | |
1946 | int insn; | |
1947 | ||
1948 | /* Install the generic stub template. | |
1949 | ||
1950 | We are modifying the contents of the stub section, so we do not | |
1951 | need to include the stub section's output_offset here. */ | |
1952 | memcpy (stub->contents + dyn_h->stub_offset, plt_stub, sizeof (plt_stub)); | |
1953 | ||
1954 | /* Fix up the first ldd instruction. | |
1955 | ||
1956 | We are modifying the contents of the STUB section in memory, | |
1957 | so we do not need to include its output offset in this computation. | |
1958 | ||
1959 | Note the plt_offset value is the value of the PLT entry relative to | |
1960 | the start of the PLT section. These instructions will reference | |
1961 | data relative to the value of __gp, which may not necessarily have | |
1962 | the same address as the start of the PLT section. | |
1963 | ||
1964 | gp_offset contains the offset of __gp within the PLT section. */ | |
1965 | value = dyn_h->plt_offset - hppa_info->gp_offset; | |
1966 | ||
1967 | insn = bfd_get_32 (stub->owner, stub->contents + dyn_h->stub_offset); | |
1968 | insn &= 0xffffc00e; | |
1969 | insn |= ((value & 0x2000) >> 13); | |
1970 | value &= 0x1ff8; | |
1971 | value <<= 1; | |
1972 | bfd_put_32 (stub->owner, (insn | value), | |
1973 | stub->contents + dyn_h->stub_offset); | |
1974 | ||
1975 | /* Fix up the second ldd instruction. */ | |
1976 | value = dyn_h->plt_offset - hppa_info->gp_offset + 8; | |
1977 | ||
1978 | insn = bfd_get_32 (stub->owner, stub->contents + dyn_h->stub_offset + 8); | |
1979 | insn &= 0xffffc00e; | |
1980 | insn |= ((value & 0x2000) >> 13); | |
1981 | value &= 0x1ff8; | |
1982 | value <<= 1; | |
1983 | bfd_put_32 (stub->owner, (insn | value), | |
1984 | stub->contents + dyn_h->stub_offset + 8); | |
1985 | } | |
1986 | ||
1987 | /* Millicode symbols should not be put in the dynamic | |
1988 | symbol table under any circumstances. */ | |
1989 | if (ELF_ST_TYPE (sym->st_info) == STT_PARISC_MILLI) | |
1990 | h->dynindx = -1; | |
1991 | ||
1992 | return true; | |
1993 | } | |
1994 | ||
1995 | /* The .opd section contains FPTRs for each function this file | |
1996 | exports. Initialize the FPTR entries. */ | |
1997 | ||
1998 | static boolean | |
1999 | elf64_hppa_finalize_opd (dyn_h, data) | |
2000 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
2001 | PTR data; | |
2002 | { | |
2003 | struct bfd_link_info *info = (struct bfd_link_info *)data; | |
2004 | struct elf64_hppa_link_hash_table *hppa_info; | |
2005 | struct elf_link_hash_entry *h = dyn_h->h; | |
2006 | asection *sopd; | |
2007 | asection *sopdrel; | |
2008 | ||
2009 | hppa_info = elf64_hppa_hash_table (info); | |
2010 | sopd = hppa_info->opd_sec; | |
2011 | sopdrel = hppa_info->opd_rel_sec; | |
2012 | ||
2013 | if (h && dyn_h && dyn_h->want_opd) | |
2014 | { | |
2015 | bfd_vma value; | |
2016 | ||
2017 | /* The first two words of an .opd entry are zero. | |
2018 | ||
2019 | We are modifying the contents of the OPD section in memory, so we | |
2020 | do not need to include its output offset in this computation. */ | |
2021 | memset (sopd->contents + dyn_h->opd_offset, 0, 16); | |
2022 | ||
2023 | value = (h->root.u.def.value | |
2024 | + h->root.u.def.section->output_section->vma | |
2025 | + h->root.u.def.section->output_offset); | |
2026 | ||
2027 | /* The next word is the address of the function. */ | |
2028 | bfd_put_64 (sopd->owner, value, sopd->contents + dyn_h->opd_offset + 16); | |
2029 | ||
2030 | /* The last word is our local __gp value. */ | |
2031 | value = _bfd_get_gp_value (sopd->output_section->owner); | |
2032 | bfd_put_64 (sopd->owner, value, sopd->contents + dyn_h->opd_offset + 24); | |
2033 | } | |
2034 | ||
2035 | /* If we are generating a shared library, we must generate EPLT relocations | |
2036 | for each entry in the .opd, even for static functions (they may have | |
2037 | had their address taken). */ | |
2038 | if (info->shared && dyn_h && dyn_h->want_opd) | |
2039 | { | |
2040 | Elf64_Internal_Rela rel; | |
2041 | bfd_vma value; | |
2042 | int dynindx; | |
2043 | ||
2044 | /* We may need to do a relocation against a local symbol, in | |
2045 | which case we have to look up it's dynamic symbol index off | |
2046 | the local symbol hash table. */ | |
2047 | if (h && h->dynindx != -1) | |
2048 | dynindx = h->dynindx; | |
2049 | else | |
2050 | dynindx | |
2051 | = _bfd_elf_link_lookup_local_dynindx (info, dyn_h->owner, | |
2052 | dyn_h->sym_indx); | |
2053 | ||
2054 | /* The offset of this relocation is the absolute address of the | |
2055 | .opd entry for this symbol. */ | |
2056 | rel.r_offset = (dyn_h->opd_offset + sopd->output_offset | |
2057 | + sopd->output_section->vma); | |
2058 | ||
2059 | /* If H is non-null, then we have an external symbol. | |
2060 | ||
2061 | It is imperative that we use a different dynamic symbol for the | |
2062 | EPLT relocation if the symbol has global scope. | |
2063 | ||
2064 | In the dynamic symbol table, the function symbol will have a value | |
2065 | which is address of the function's .opd entry. | |
2066 | ||
2067 | Thus, we can not use that dynamic symbol for the EPLT relocation | |
2068 | (if we did, the data in the .opd would reference itself rather | |
2069 | than the actual address of the function). Instead we have to use | |
2070 | a new dynamic symbol which has the same value as the original global | |
2071 | function symbol. | |
2072 | ||
2073 | We prefix the original symbol with a "." and use the new symbol in | |
2074 | the EPLT relocation. This new symbol has already been recorded in | |
2075 | the symbol table, we just have to look it up and use it. | |
2076 | ||
2077 | We do not have such problems with static functions because we do | |
2078 | not make their addresses in the dynamic symbol table point to | |
2079 | the .opd entry. Ultimately this should be safe since a static | |
2080 | function can not be directly referenced outside of its shared | |
2081 | library. | |
2082 | ||
2083 | We do have to play similar games for FPTR relocations in shared | |
2084 | libraries, including those for static symbols. See the FPTR | |
2085 | handling in elf64_hppa_finalize_dynreloc. */ | |
2086 | if (h) | |
2087 | { | |
2088 | char *new_name; | |
2089 | struct elf_link_hash_entry *nh; | |
2090 | ||
2091 | new_name = alloca (strlen (h->root.root.string) + 2); | |
2092 | new_name[0] = '.'; | |
2093 | strcpy (new_name + 1, h->root.root.string); | |
2094 | ||
2095 | nh = elf_link_hash_lookup (elf_hash_table (info), | |
2096 | new_name, false, false, false); | |
2097 | ||
2098 | /* All we really want from the new symbol is its dynamic | |
2099 | symbol index. */ | |
2100 | dynindx = nh->dynindx; | |
2101 | } | |
2102 | ||
2103 | rel.r_addend = 0; | |
2104 | rel.r_info = ELF64_R_INFO (dynindx, R_PARISC_EPLT); | |
2105 | ||
2106 | bfd_elf64_swap_reloca_out (sopd->output_section->owner, &rel, | |
2107 | (((Elf64_External_Rela *) | |
2108 | sopdrel->contents) | |
2109 | + sopdrel->reloc_count)); | |
2110 | sopdrel->reloc_count++; | |
2111 | } | |
2112 | return true; | |
2113 | } | |
2114 | ||
2115 | /* The .dlt section contains addresses for items referenced through the | |
2116 | dlt. Note that we can have a DLTIND relocation for a local symbol, thus | |
2117 | we can not depend on finish_dynamic_symbol to initialize the .dlt. */ | |
2118 | ||
2119 | static boolean | |
2120 | elf64_hppa_finalize_dlt (dyn_h, data) | |
2121 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
2122 | PTR data; | |
2123 | { | |
2124 | struct bfd_link_info *info = (struct bfd_link_info *)data; | |
2125 | struct elf64_hppa_link_hash_table *hppa_info; | |
2126 | asection *sdlt, *sdltrel; | |
2127 | struct elf_link_hash_entry *h = dyn_h->h; | |
2128 | ||
2129 | hppa_info = elf64_hppa_hash_table (info); | |
2130 | ||
2131 | sdlt = hppa_info->dlt_sec; | |
2132 | sdltrel = hppa_info->dlt_rel_sec; | |
2133 | ||
2134 | /* H/DYN_H may refer to a local variable and we know it's | |
2135 | address, so there is no need to create a relocation. Just install | |
2136 | the proper value into the DLT, note this shortcut can not be | |
2137 | skipped when building a shared library. */ | |
2138 | if (! info->shared && h && dyn_h && dyn_h->want_dlt) | |
2139 | { | |
2140 | bfd_vma value; | |
2141 | ||
2142 | /* If we had an LTOFF_FPTR style relocation we want the DLT entry | |
2143 | to point to the FPTR entry in the .opd section. | |
2144 | ||
2145 | We include the OPD's output offset in this computation as | |
2146 | we are referring to an absolute address in the resulting | |
2147 | object file. */ | |
2148 | if (dyn_h->want_opd) | |
2149 | { | |
2150 | value = (dyn_h->opd_offset | |
2151 | + hppa_info->opd_sec->output_offset | |
2152 | + hppa_info->opd_sec->output_section->vma); | |
2153 | } | |
2154 | else | |
2155 | { | |
2156 | value = (h->root.u.def.value | |
2157 | + h->root.u.def.section->output_offset); | |
2158 | ||
2159 | if (h->root.u.def.section->output_section) | |
2160 | value += h->root.u.def.section->output_section->vma; | |
2161 | else | |
2162 | value += h->root.u.def.section->vma; | |
2163 | } | |
2164 | ||
2165 | /* We do not need to include the output offset of the DLT section | |
2166 | here because we are modifying the in-memory contents. */ | |
2167 | bfd_put_64 (sdlt->owner, value, sdlt->contents + dyn_h->dlt_offset); | |
2168 | } | |
2169 | ||
2170 | /* Create a relocation for the DLT entry assocated with this symbol. | |
2171 | When building a shared library the symbol does not have to be dynamic. */ | |
2172 | if (dyn_h->want_dlt | |
2173 | && (elf64_hppa_dynamic_symbol_p (dyn_h->h, info) || info->shared)) | |
2174 | { | |
2175 | Elf64_Internal_Rela rel; | |
2176 | int dynindx; | |
2177 | ||
2178 | /* We may need to do a relocation against a local symbol, in | |
2179 | which case we have to look up it's dynamic symbol index off | |
2180 | the local symbol hash table. */ | |
2181 | if (h && h->dynindx != -1) | |
2182 | dynindx = h->dynindx; | |
2183 | else | |
2184 | dynindx | |
2185 | = _bfd_elf_link_lookup_local_dynindx (info, dyn_h->owner, | |
2186 | dyn_h->sym_indx); | |
2187 | ||
2188 | ||
2189 | /* Create a dynamic relocation for this entry. Do include the output | |
2190 | offset of the DLT entry since we need an absolute address in the | |
2191 | resulting object file. */ | |
2192 | rel.r_offset = (dyn_h->dlt_offset + sdlt->output_offset | |
2193 | + sdlt->output_section->vma); | |
2194 | if (h && h->type == STT_FUNC) | |
2195 | rel.r_info = ELF64_R_INFO (dynindx, R_PARISC_FPTR64); | |
2196 | else | |
2197 | rel.r_info = ELF64_R_INFO (dynindx, R_PARISC_DIR64); | |
2198 | rel.r_addend = 0; | |
2199 | ||
2200 | bfd_elf64_swap_reloca_out (sdlt->output_section->owner, &rel, | |
2201 | (((Elf64_External_Rela *) | |
2202 | sdltrel->contents) | |
2203 | + sdltrel->reloc_count)); | |
2204 | sdltrel->reloc_count++; | |
2205 | } | |
2206 | return true; | |
2207 | } | |
2208 | ||
2209 | /* Finalize the dynamic relocations. Specifically the FPTR relocations | |
2210 | for dynamic functions used to initialize static data. */ | |
2211 | ||
2212 | static boolean | |
2213 | elf64_hppa_finalize_dynreloc (dyn_h, data) | |
2214 | struct elf64_hppa_dyn_hash_entry *dyn_h; | |
2215 | PTR data; | |
2216 | { | |
2217 | struct bfd_link_info *info = (struct bfd_link_info *)data; | |
2218 | struct elf64_hppa_link_hash_table *hppa_info; | |
2219 | struct elf_link_hash_entry *h; | |
2220 | int dynamic_symbol; | |
2221 | ||
2222 | dynamic_symbol = elf64_hppa_dynamic_symbol_p (dyn_h->h, info); | |
2223 | ||
2224 | if (!dynamic_symbol && !info->shared) | |
2225 | return true; | |
2226 | ||
2227 | if (dyn_h->reloc_entries) | |
2228 | { | |
2229 | struct elf64_hppa_dyn_reloc_entry *rent; | |
2230 | int dynindx; | |
2231 | ||
2232 | hppa_info = elf64_hppa_hash_table (info); | |
2233 | h = dyn_h->h; | |
2234 | ||
2235 | /* We may need to do a relocation against a local symbol, in | |
2236 | which case we have to look up it's dynamic symbol index off | |
2237 | the local symbol hash table. */ | |
2238 | if (h && h->dynindx != -1) | |
2239 | dynindx = h->dynindx; | |
2240 | else | |
2241 | dynindx | |
2242 | = _bfd_elf_link_lookup_local_dynindx (info, dyn_h->owner, | |
2243 | dyn_h->sym_indx); | |
2244 | ||
2245 | for (rent = dyn_h->reloc_entries; rent; rent = rent->next) | |
2246 | { | |
2247 | Elf64_Internal_Rela rel; | |
2248 | ||
2249 | switch (rent->type) | |
2250 | { | |
2251 | case R_PARISC_FPTR64: | |
2252 | /* Allocate one iff we are not building a shared library and | |
2253 | !want_opd, which by this point will be true only if we're | |
2254 | actually allocating one statically in the main executable. */ | |
2255 | if (!info->shared && dyn_h->want_opd) | |
2256 | continue; | |
2257 | break; | |
2258 | } | |
2259 | ||
2260 | /* Create a dynamic relocation for this entry. | |
2261 | ||
2262 | We need the output offset for the reloc's section because | |
2263 | we are creating an absolute address in the resulting object | |
2264 | file. */ | |
2265 | rel.r_offset = (rent->offset + rent->sec->output_offset | |
2266 | + rent->sec->output_section->vma); | |
2267 | ||
2268 | /* An FPTR64 relocation implies that we took the address of | |
2269 | a function and that the function has an entry in the .opd | |
2270 | section. We want the FPTR64 relocation to reference the | |
2271 | entry in .opd. | |
2272 | ||
2273 | We could munge the symbol value in the dynamic symbol table | |
2274 | (in fact we already do for functions with global scope) to point | |
2275 | to the .opd entry. Then we could use that dynamic symbol in | |
2276 | this relocation. | |
2277 | ||
2278 | Or we could do something sensible, not munge the symbol's | |
2279 | address and instead just use a different symbol to reference | |
2280 | the .opd entry. At least that seems sensible until you | |
2281 | realize there's no local dynamic symbols we can use for that | |
2282 | purpose. Thus the hair in the check_relocs routine. | |
2283 | ||
2284 | We use a section symbol recorded by check_relocs as the | |
2285 | base symbol for the relocation. The addend is the difference | |
2286 | between the section symbol and the address of the .opd entry. */ | |
2287 | if (info->shared && rent->type == R_PARISC_FPTR64) | |
2288 | { | |
2289 | bfd_vma value, value2; | |
2290 | asymbol *sym; | |
2291 | int elf_index; | |
2292 | ||
2293 | /* First compute the address of the opd entry for this symbol. */ | |
2294 | value = (dyn_h->opd_offset | |
2295 | + hppa_info->opd_sec->output_section->vma | |
2296 | + hppa_info->opd_sec->output_offset); | |
2297 | ||
2298 | /* Compute the value of the start of the section with | |
2299 | the relocation. */ | |
2300 | value2 = (rent->sec->output_section->vma | |
2301 | + rent->sec->output_offset); | |
2302 | ||
2303 | /* Compute the difference between the start of the section | |
2304 | with the relocation and the opd entry. */ | |
2305 | value -= value2; | |
2306 | ||
2307 | /* The result becomes the addend of the relocation. */ | |
2308 | rel.r_addend = value; | |
2309 | ||
2310 | /* The section symbol becomes the symbol for the dynamic | |
2311 | relocation. */ | |
2312 | dynindx | |
2313 | = _bfd_elf_link_lookup_local_dynindx (info, | |
2314 | rent->sec->owner, | |
2315 | rent->sec_symndx); | |
2316 | } | |
2317 | else | |
2318 | rel.r_addend = rent->addend; | |
2319 | ||
2320 | rel.r_info = ELF64_R_INFO (dynindx, rent->type); | |
2321 | ||
2322 | bfd_elf64_swap_reloca_out (hppa_info->other_rel_sec->output_section->owner, | |
2323 | &rel, | |
2324 | (((Elf64_External_Rela *) | |
2325 | hppa_info->other_rel_sec->contents) | |
2326 | + hppa_info->other_rel_sec->reloc_count)); | |
2327 | hppa_info->other_rel_sec->reloc_count++; | |
2328 | } | |
2329 | } | |
2330 | ||
2331 | return true; | |
2332 | } | |
2333 | ||
2334 | /* Finish up the dynamic sections. */ | |
2335 | ||
2336 | static boolean | |
2337 | elf64_hppa_finish_dynamic_sections (output_bfd, info) | |
2338 | bfd *output_bfd; | |
2339 | struct bfd_link_info *info; | |
2340 | { | |
2341 | bfd *dynobj; | |
2342 | asection *sdyn; | |
2343 | struct elf64_hppa_link_hash_table *hppa_info; | |
2344 | ||
2345 | hppa_info = elf64_hppa_hash_table (info); | |
2346 | ||
2347 | /* Finalize the contents of the .opd section. */ | |
2348 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
2349 | elf64_hppa_finalize_opd, | |
2350 | info); | |
2351 | ||
2352 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
2353 | elf64_hppa_finalize_dynreloc, | |
2354 | info); | |
2355 | ||
2356 | /* Finalize the contents of the .dlt section. */ | |
2357 | dynobj = elf_hash_table (info)->dynobj; | |
2358 | /* Finalize the contents of the .dlt section. */ | |
2359 | elf64_hppa_dyn_hash_traverse (&hppa_info->dyn_hash_table, | |
2360 | elf64_hppa_finalize_dlt, | |
2361 | info); | |
2362 | ||
2363 | ||
2364 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
2365 | ||
2366 | if (elf_hash_table (info)->dynamic_sections_created) | |
2367 | { | |
2368 | Elf64_External_Dyn *dyncon, *dynconend; | |
2369 | struct elf_link_hash_entry *h; | |
2370 | ||
2371 | BFD_ASSERT (sdyn != NULL); | |
2372 | ||
2373 | dyncon = (Elf64_External_Dyn *) sdyn->contents; | |
2374 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
2375 | for (; dyncon < dynconend; dyncon++) | |
2376 | { | |
2377 | Elf_Internal_Dyn dyn; | |
2378 | asection *s; | |
2379 | ||
2380 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); | |
2381 | ||
2382 | switch (dyn.d_tag) | |
2383 | { | |
2384 | default: | |
2385 | break; | |
2386 | ||
2387 | case DT_HP_LOAD_MAP: | |
2388 | /* Compute the absolute address of 16byte scratchpad area | |
2389 | for the dynamic linker. | |
2390 | ||
2391 | By convention the linker script will allocate the scratchpad | |
2392 | area at the start of the .data section. So all we have to | |
2393 | to is find the start of the .data section. */ | |
2394 | s = bfd_get_section_by_name (output_bfd, ".data"); | |
2395 | dyn.d_un.d_ptr = s->vma; | |
2396 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2397 | break; | |
2398 | ||
2399 | case DT_PLTGOT: | |
2400 | /* HP's use PLTGOT to set the GOT register. */ | |
2401 | dyn.d_un.d_ptr = _bfd_get_gp_value (output_bfd); | |
2402 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2403 | break; | |
2404 | ||
2405 | case DT_JMPREL: | |
2406 | s = hppa_info->plt_rel_sec; | |
2407 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
2408 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2409 | break; | |
2410 | ||
2411 | case DT_PLTRELSZ: | |
2412 | s = hppa_info->plt_rel_sec; | |
2413 | dyn.d_un.d_val = s->_raw_size; | |
2414 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2415 | break; | |
2416 | ||
2417 | case DT_RELA: | |
2418 | s = hppa_info->other_rel_sec; | |
2419 | if (! s) | |
2420 | s = hppa_info->dlt_rel_sec; | |
2421 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
2422 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2423 | break; | |
2424 | ||
2425 | case DT_RELASZ: | |
2426 | s = hppa_info->other_rel_sec; | |
2427 | dyn.d_un.d_val = s->_raw_size; | |
2428 | s = hppa_info->dlt_rel_sec; | |
2429 | dyn.d_un.d_val += s->_raw_size; | |
2430 | s = hppa_info->opd_rel_sec; | |
2431 | dyn.d_un.d_val += s->_raw_size; | |
2432 | /* There is some question about whether or not the size of | |
2433 | the PLT relocs should be included here. HP's tools do | |
2434 | it, so we'll emulate them. */ | |
2435 | s = hppa_info->plt_rel_sec; | |
2436 | dyn.d_un.d_val += s->_raw_size; | |
2437 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2438 | break; | |
2439 | ||
2440 | } | |
2441 | } | |
2442 | } | |
2443 | ||
2444 | return true; | |
2445 | } | |
2446 | ||
2447 | ||
2448 | /* Return the number of additional phdrs we will need. | |
2449 | ||
2450 | The generic ELF code only creates PT_PHDRs for executables. The HP | |
2451 | dynamic linker requires PT_PHDRs for dynamic libraries too. | |
2452 | ||
2453 | This routine indicates that the backend needs one additional program | |
2454 | header for that case. | |
2455 | ||
2456 | Note we do not have access to the link info structure here, so we have | |
2457 | to guess whether or not we are building a shared library based on the | |
2458 | existence of a .interp section. */ | |
2459 | ||
2460 | static int | |
2461 | elf64_hppa_additional_program_headers (abfd) | |
2462 | bfd *abfd; | |
2463 | { | |
2464 | asection *s; | |
2465 | ||
2466 | /* If we are creating a shared library, then we have to create a | |
2467 | PT_PHDR segment. HP's dynamic linker chokes without it. */ | |
2468 | s = bfd_get_section_by_name (abfd, ".interp"); | |
2469 | if (! s) | |
2470 | return 1; | |
2471 | return 0; | |
2472 | } | |
2473 | ||
2474 | /* Allocate and initialize any program headers required by this | |
2475 | specific backend. | |
2476 | ||
2477 | The generic ELF code only creates PT_PHDRs for executables. The HP | |
2478 | dynamic linker requires PT_PHDRs for dynamic libraries too. | |
2479 | ||
2480 | This allocates the PT_PHDR and initializes it in a manner suitable | |
2481 | for the HP linker. | |
2482 | ||
2483 | Note we do not have access to the link info structure here, so we have | |
2484 | to guess whether or not we are building a shared library based on the | |
2485 | existence of a .interp section. */ | |
2486 | ||
2487 | static boolean | |
2488 | elf64_hppa_modify_segment_map (abfd) | |
2489 | bfd *abfd; | |
2490 | { | |
2491 | struct elf_segment_map *m, **pm; | |
2492 | asection *s; | |
2493 | ||
2494 | s = bfd_get_section_by_name (abfd, ".interp"); | |
2495 | if (! s) | |
2496 | { | |
2497 | for (m = elf_tdata (abfd)->segment_map; m != NULL; m = m->next) | |
2498 | if (m->p_type == PT_PHDR) | |
2499 | break; | |
2500 | if (m == NULL) | |
2501 | { | |
2502 | m = (struct elf_segment_map *) bfd_zalloc (abfd, sizeof *m); | |
2503 | if (m == NULL) | |
2504 | return false; | |
2505 | ||
2506 | m->p_type = PT_PHDR; | |
2507 | m->p_flags = PF_R | PF_X; | |
2508 | m->p_flags_valid = 1; | |
2509 | m->p_paddr_valid = 1; | |
2510 | m->includes_phdrs = 1; | |
2511 | ||
2512 | m->next = elf_tdata (abfd)->segment_map; | |
2513 | elf_tdata (abfd)->segment_map = m; | |
2514 | } | |
2515 | } | |
2516 | ||
2517 | for (m = elf_tdata (abfd)->segment_map; m != NULL; m = m->next) | |
2518 | if (m->p_type == PT_LOAD) | |
2519 | { | |
2520 | int i; | |
2521 | ||
2522 | for (i = 0; i < m->count; i++) | |
2523 | { | |
2524 | /* The code "hint" is not really a hint. It is a requirement | |
2525 | for certain versions of the HP dynamic linker. Worse yet, | |
2526 | it must be set even if the shared library does not have | |
2527 | any code in its "text" segment (thus the check for .hash | |
2528 | to catch this situation). */ | |
2529 | if (m->sections[i]->flags & SEC_CODE | |
2530 | || (strcmp (m->sections[i]->name, ".hash") == 0)) | |
2531 | m->p_flags |= (PF_X | PF_HP_CODE); | |
2532 | } | |
2533 | } | |
2534 | ||
2535 | return true; | |
2536 | } | |
2537 | ||
2538 | /* The hash bucket size is the standard one, namely 4. */ | |
2539 | ||
2540 | const struct elf_size_info hppa64_elf_size_info = | |
2541 | { | |
2542 | sizeof (Elf64_External_Ehdr), | |
2543 | sizeof (Elf64_External_Phdr), | |
2544 | sizeof (Elf64_External_Shdr), | |
2545 | sizeof (Elf64_External_Rel), | |
2546 | sizeof (Elf64_External_Rela), | |
2547 | sizeof (Elf64_External_Sym), | |
2548 | sizeof (Elf64_External_Dyn), | |
2549 | sizeof (Elf_External_Note), | |
2550 | 4, | |
2551 | 1, | |
2552 | 64, 8, | |
2553 | ELFCLASS64, EV_CURRENT, | |
2554 | bfd_elf64_write_out_phdrs, | |
2555 | bfd_elf64_write_shdrs_and_ehdr, | |
2556 | bfd_elf64_write_relocs, | |
2557 | bfd_elf64_swap_symbol_out, | |
2558 | bfd_elf64_slurp_reloc_table, | |
2559 | bfd_elf64_slurp_symbol_table, | |
2560 | bfd_elf64_swap_dyn_in, | |
2561 | bfd_elf64_swap_dyn_out, | |
2562 | NULL, | |
2563 | NULL, | |
2564 | NULL, | |
2565 | NULL | |
2566 | }; | |
2567 | ||
2568 | #define TARGET_BIG_SYM bfd_elf64_hppa_vec | |
2569 | #define TARGET_BIG_NAME "elf64-hppa" | |
2570 | #define ELF_ARCH bfd_arch_hppa | |
2571 | #define ELF_MACHINE_CODE EM_PARISC | |
2572 | /* This is not strictly correct. The maximum page size for PA2.0 is | |
2573 | 64M. But everything still uses 4k. */ | |
2574 | #define ELF_MAXPAGESIZE 0x1000 | |
2575 | #define bfd_elf64_bfd_reloc_type_lookup elf_hppa_reloc_type_lookup | |
2576 | #define bfd_elf64_bfd_is_local_label_name elf_hppa_is_local_label_name | |
2577 | #define elf_info_to_howto elf_hppa_info_to_howto | |
2578 | #define elf_info_to_howto_rel elf_hppa_info_to_howto_rel | |
2579 | ||
2580 | #define elf_backend_section_from_shdr elf64_hppa_section_from_shdr | |
2581 | #define elf_backend_object_p elf64_hppa_object_p | |
2582 | #define elf_backend_final_write_processing \ | |
2583 | elf_hppa_final_write_processing | |
2584 | #define elf_backend_fake_sections elf_hppa_fake_sections | |
2585 | #define elf_backend_add_symbol_hook elf_hppa_add_symbol_hook | |
2586 | ||
2587 | #define elf_backend_relocate_section elf_hppa_relocate_section | |
2588 | ||
2589 | #define bfd_elf64_bfd_final_link elf_hppa_final_link | |
2590 | ||
2591 | #define elf_backend_create_dynamic_sections \ | |
2592 | elf64_hppa_create_dynamic_sections | |
2593 | #define elf_backend_post_process_headers elf64_hppa_post_process_headers | |
2594 | ||
2595 | #define elf_backend_adjust_dynamic_symbol \ | |
2596 | elf64_hppa_adjust_dynamic_symbol | |
2597 | ||
2598 | #define elf_backend_size_dynamic_sections \ | |
2599 | elf64_hppa_size_dynamic_sections | |
2600 | ||
2601 | #define elf_backend_finish_dynamic_symbol \ | |
2602 | elf64_hppa_finish_dynamic_symbol | |
2603 | #define elf_backend_finish_dynamic_sections \ | |
2604 | elf64_hppa_finish_dynamic_sections | |
2605 | ||
2606 | /* Stuff for the BFD linker: */ | |
2607 | #define bfd_elf64_bfd_link_hash_table_create \ | |
2608 | elf64_hppa_hash_table_create | |
2609 | ||
2610 | #define elf_backend_check_relocs \ | |
2611 | elf64_hppa_check_relocs | |
2612 | ||
2613 | #define elf_backend_size_info \ | |
2614 | hppa64_elf_size_info | |
2615 | ||
2616 | #define elf_backend_additional_program_headers \ | |
2617 | elf64_hppa_additional_program_headers | |
2618 | ||
2619 | #define elf_backend_modify_segment_map \ | |
2620 | elf64_hppa_modify_segment_map | |
2621 | ||
2622 | #define elf_backend_link_output_symbol_hook \ | |
2623 | elf64_hppa_link_output_symbol_hook | |
2624 | ||
2625 | ||
2626 | #define elf_backend_want_got_plt 0 | |
2627 | #define elf_backend_plt_readonly 0 | |
2628 | #define elf_backend_want_plt_sym 0 | |
2629 | #define elf_backend_got_header_size 0 | |
2630 | #define elf_backend_plt_header_size 0 | |
2631 | #define elf_backend_type_change_ok true | |
2632 | ||
2633 | #include "elf64-target.h" |