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08759e0f CM |
1 | /* ARC-specific support for 32-bit ELF |
2 | Copyright (C) 1994-2016 Free Software Foundation, Inc. | |
3 | Contributed by Cupertino Miranda (cmiranda@synopsys.com). | |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
20 | MA 02110-1301, USA. */ | |
21 | ||
22 | #ifndef ARC_GOT_H | |
23 | #define ARC_GOT_H | |
24 | ||
25 | enum tls_type_e | |
26 | { | |
27 | GOT_UNKNOWN = 0, | |
28 | GOT_NORMAL, | |
29 | GOT_TLS_GD, | |
30 | GOT_TLS_IE, | |
31 | GOT_TLS_LE | |
32 | }; | |
33 | ||
34 | enum tls_got_entries | |
35 | { | |
36 | TLS_GOT_NONE = 0, | |
37 | TLS_GOT_MOD, | |
38 | TLS_GOT_OFF, | |
39 | TLS_GOT_MOD_AND_OFF | |
40 | }; | |
41 | ||
42 | struct got_entry | |
43 | { | |
44 | struct got_entry *next; | |
45 | enum tls_type_e type; | |
46 | bfd_vma offset; | |
47 | bfd_boolean processed; | |
48 | bfd_boolean created_dyn_relocation; | |
49 | enum tls_got_entries existing_entries; | |
50 | }; | |
51 | ||
52 | static struct got_entry ** | |
53 | arc_get_local_got_ents (bfd * abfd) | |
54 | { | |
55 | static struct got_entry **local_got_ents = NULL; | |
56 | ||
57 | if (local_got_ents == NULL) | |
58 | { | |
59 | size_t size; | |
60 | Elf_Internal_Shdr *symtab_hdr = &((elf_tdata (abfd))->symtab_hdr); | |
61 | ||
62 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
63 | local_got_ents = (struct got_entry **) | |
64 | bfd_alloc (abfd, sizeof (struct got_entry *) * size); | |
65 | if (local_got_ents == NULL) | |
66 | return FALSE; | |
67 | ||
68 | memset (local_got_ents, 0, sizeof (struct got_entry *) * size); | |
69 | elf_local_got_ents (abfd) = local_got_ents; | |
70 | } | |
71 | ||
72 | return local_got_ents; | |
73 | } | |
74 | ||
75 | static struct got_entry * | |
76 | got_entry_for_type (struct got_entry **list, | |
77 | enum tls_type_e type) | |
78 | { | |
79 | struct got_entry **p = list; | |
f7e8b360 | 80 | |
08759e0f CM |
81 | while (*p != NULL) |
82 | { | |
83 | if ((*p)->type == type) | |
84 | return *p; | |
85 | p = &((*p)->next); | |
86 | } | |
87 | return NULL; | |
88 | } | |
89 | ||
90 | static void | |
91 | new_got_entry_to_list (struct got_entry **list, | |
92 | enum tls_type_e type, | |
93 | bfd_vma offset, | |
94 | enum tls_got_entries existing_entries) | |
95 | { | |
96 | /* Find list end. Avoid having multiple entries of the same | |
97 | type. */ | |
98 | struct got_entry **p = list; | |
f7e8b360 NC |
99 | struct got_entry *entry; |
100 | ||
08759e0f CM |
101 | while (*p != NULL) |
102 | { | |
103 | if ((*p)->type == type) | |
104 | return; | |
105 | p = &((*p)->next); | |
106 | } | |
107 | ||
f7e8b360 | 108 | entry = (struct got_entry *) xmalloc (sizeof (struct got_entry)); |
08759e0f CM |
109 | |
110 | entry->type = type; | |
111 | entry->offset = offset; | |
112 | entry->next = NULL; | |
113 | entry->processed = FALSE; | |
114 | entry->created_dyn_relocation = FALSE; | |
115 | entry->existing_entries = existing_entries; | |
116 | ||
117 | ARC_DEBUG ("New GOT got entry added to list: " | |
f7e8b360 NC |
118 | "type: %d, offset: %ld, existing_entries: %d\n", |
119 | type, (long) offset, existing_entries); | |
08759e0f CM |
120 | |
121 | /* Add the entry to the end of the list. */ | |
122 | *p = entry; | |
123 | } | |
124 | ||
125 | static enum tls_type_e | |
126 | tls_type_for_reloc (reloc_howto_type *howto) | |
127 | { | |
128 | enum tls_type_e ret = GOT_UNKNOWN; | |
f7e8b360 | 129 | |
08759e0f | 130 | if (is_reloc_for_GOT (howto)) |
f7e8b360 NC |
131 | return GOT_NORMAL; |
132 | ||
133 | switch (howto->type) | |
08759e0f | 134 | { |
f7e8b360 NC |
135 | case R_ARC_TLS_GD_GOT: |
136 | ret = GOT_TLS_GD; | |
137 | break; | |
138 | case R_ARC_TLS_IE_GOT: | |
139 | ret = GOT_TLS_IE; | |
140 | break; | |
141 | case R_ARC_TLS_LE_32: | |
142 | ret = GOT_TLS_LE; | |
143 | break; | |
144 | default: | |
145 | ret = GOT_UNKNOWN; | |
146 | break; | |
08759e0f | 147 | } |
f7e8b360 | 148 | |
08759e0f CM |
149 | return ret; |
150 | }; | |
151 | ||
152 | static struct got_entry ** | |
153 | get_got_entry_list_for_symbol (bfd *abfd, | |
154 | unsigned long r_symndx, | |
155 | struct elf_link_hash_entry *h) | |
156 | { | |
157 | if (h != NULL) | |
158 | { | |
159 | return &h->got.glist; | |
160 | } | |
161 | else | |
162 | { | |
163 | struct got_entry **local_got_ents | |
164 | = arc_get_local_got_ents (abfd); | |
165 | return &local_got_ents[r_symndx]; | |
166 | } | |
167 | } | |
168 | ||
169 | ||
170 | static enum tls_type_e | |
171 | arc_got_entry_type_for_reloc (reloc_howto_type *howto) | |
172 | { | |
173 | enum tls_type_e type = GOT_UNKNOWN; | |
174 | ||
175 | if (is_reloc_for_GOT (howto)) | |
f7e8b360 NC |
176 | return GOT_NORMAL; |
177 | ||
178 | if (is_reloc_for_TLS (howto)) | |
08759e0f CM |
179 | { |
180 | switch (howto->type) | |
181 | { | |
182 | case R_ARC_TLS_GD_GOT: | |
183 | type = GOT_TLS_GD; | |
184 | break; | |
185 | case R_ARC_TLS_IE_GOT: | |
186 | type = GOT_TLS_IE; | |
187 | break; | |
188 | default: | |
189 | break; | |
190 | } | |
191 | } | |
192 | return type; | |
193 | } | |
194 | ||
195 | #define ADD_SYMBOL_REF_SEC_AND_RELOC(SECNAME, COND_FOR_RELOC, H) \ | |
196 | htab->s##SECNAME->size; \ | |
197 | { \ | |
198 | if (COND_FOR_RELOC) \ | |
199 | { \ | |
200 | htab->srel##SECNAME->size += sizeof (Elf32_External_Rela); \ | |
201 | ARC_DEBUG ("arc_info: Added reloc space in " \ | |
202 | #SECNAME " section at " __FILE__ \ | |
203 | ":%d for symbol %s\n", \ | |
204 | __LINE__, name_for_global_symbol (H)); \ | |
205 | } \ | |
206 | if (H) \ | |
207 | if (h->dynindx == -1 && !h->forced_local) \ | |
208 | if (! bfd_elf_link_record_dynamic_symbol (info, H)) \ | |
209 | return FALSE; \ | |
210 | htab->s##SECNAME->size += 4; \ | |
211 | } \ | |
212 | ||
213 | static bfd_boolean | |
214 | arc_fill_got_info_for_reloc (enum tls_type_e type, | |
215 | struct got_entry **list, | |
216 | struct bfd_link_info * info, | |
217 | struct elf_link_hash_entry *h) | |
218 | { | |
219 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
220 | ||
221 | if (got_entry_for_type (list, type) != NULL) | |
222 | return TRUE; | |
223 | ||
224 | switch (type) | |
225 | { | |
226 | case GOT_NORMAL: | |
227 | { | |
228 | bfd_vma offset | |
229 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, bfd_link_pic (info) | |
230 | || h != NULL, h); | |
231 | new_got_entry_to_list (list, type, offset, TLS_GOT_NONE); | |
232 | } | |
233 | break; | |
234 | ||
235 | ||
236 | case GOT_TLS_GD: | |
237 | { | |
238 | bfd_vma offset | |
239 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, TRUE, h); | |
240 | bfd_vma ATTRIBUTE_UNUSED notneeded | |
241 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, TRUE, h); | |
242 | new_got_entry_to_list (list, type, offset, TLS_GOT_MOD_AND_OFF); | |
243 | } | |
244 | break; | |
245 | case GOT_TLS_IE: | |
246 | case GOT_TLS_LE: | |
247 | { | |
248 | bfd_vma offset | |
249 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, TRUE, h); | |
250 | new_got_entry_to_list (list, type, offset, TLS_GOT_OFF); | |
251 | } | |
252 | break; | |
253 | ||
254 | default: | |
255 | return FALSE; | |
256 | break; | |
257 | } | |
258 | return TRUE; | |
259 | } | |
260 | ||
261 | ||
262 | static bfd_vma | |
f7e8b360 NC |
263 | relocate_fix_got_relocs_for_got_info (struct got_entry ** list_p, |
264 | enum tls_type_e type, | |
265 | struct bfd_link_info * info, | |
266 | bfd * output_bfd, | |
267 | unsigned long r_symndx, | |
268 | Elf_Internal_Sym * local_syms, | |
269 | asection ** local_sections, | |
270 | struct elf_link_hash_entry * h, | |
271 | struct arc_relocation_data * reloc_data) | |
08759e0f | 272 | { |
f7e8b360 NC |
273 | struct elf_link_hash_table *htab = elf_hash_table (info); |
274 | struct got_entry *entry = NULL; | |
08759e0f CM |
275 | |
276 | if (list_p == NULL || type == GOT_UNKNOWN || type == GOT_TLS_LE) | |
277 | return 0; | |
278 | ||
08759e0f CM |
279 | entry = got_entry_for_type (list_p, type); |
280 | BFD_ASSERT (entry); | |
281 | ||
282 | if (h == NULL | |
283 | || (! elf_hash_table (info)->dynamic_sections_created | |
284 | || (bfd_link_pic (info) | |
f7e8b360 | 285 | && SYMBOL_REFERENCES_LOCAL (info, h)))) |
08759e0f CM |
286 | { |
287 | const char ATTRIBUTE_UNUSED *symbol_name; | |
288 | static const char local_name[] = "(local)"; | |
289 | asection *tls_sec = NULL; | |
290 | bfd_vma sym_value = 0; | |
291 | ||
292 | if (h != NULL) | |
293 | { | |
294 | // TODO: This should not be here. | |
295 | reloc_data->sym_value = h->root.u.def.value; | |
296 | reloc_data->sym_section = h->root.u.def.section; | |
297 | ||
298 | sym_value = h->root.u.def.value | |
f7e8b360 NC |
299 | + h->root.u.def.section->output_section->vma |
300 | + h->root.u.def.section->output_offset; | |
08759e0f CM |
301 | |
302 | tls_sec = elf_hash_table (info)->tls_sec; | |
303 | ||
304 | symbol_name = h->root.root.string; | |
305 | } | |
306 | else | |
307 | { | |
308 | Elf_Internal_Sym *sym = local_syms + r_symndx; | |
309 | asection *sec = local_sections[r_symndx]; | |
310 | ||
311 | sym_value = sym->st_value | |
f7e8b360 NC |
312 | + sec->output_section->vma |
313 | + sec->output_offset; | |
08759e0f CM |
314 | |
315 | tls_sec = elf_hash_table (info)->tls_sec; | |
316 | ||
317 | symbol_name = local_name; | |
318 | } | |
319 | ||
320 | ||
321 | if (entry && entry->processed == FALSE) | |
322 | { | |
323 | switch (entry->type) | |
324 | { | |
f7e8b360 NC |
325 | case GOT_TLS_GD: |
326 | { | |
327 | BFD_ASSERT (tls_sec && tls_sec->output_section); | |
328 | bfd_vma sec_vma = tls_sec->output_section->vma; | |
329 | ||
330 | bfd_put_32 (output_bfd, | |
331 | sym_value - sec_vma, | |
332 | htab->sgot->contents + entry->offset | |
333 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF | |
334 | ? 4 : 0)); | |
335 | ||
336 | ARC_DEBUG ("arc_info: FIXED -> %s value = %#lx " | |
337 | "@ %p, for symbol %s\n", | |
338 | (entry->type == GOT_TLS_GD ? "GOT_TLS_GD" : | |
339 | "GOT_TLS_IE"), | |
340 | (long) (sym_value - sec_vma), | |
341 | htab->sgot->contents + entry->offset | |
342 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF | |
343 | ? 4 : 0), | |
344 | symbol_name); | |
345 | } | |
346 | break; | |
347 | ||
348 | case GOT_TLS_IE: | |
349 | { | |
350 | BFD_ASSERT (tls_sec && tls_sec->output_section); | |
351 | bfd_vma ATTRIBUTE_UNUSED sec_vma | |
352 | = tls_sec->output_section->vma; | |
353 | ||
354 | ARC_DEBUG ("arc_info: FIXED -> %s value = %#lx " | |
355 | "@ %p, for symbol %s\n", | |
356 | (entry->type == GOT_TLS_GD ? "GOT_TLS_GD" : | |
357 | "GOT_TLS_IE"), | |
358 | (long) (sym_value - sec_vma), | |
359 | htab->sgot->contents + entry->offset | |
360 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF | |
361 | ? 4 : 0), | |
362 | symbol_name); | |
363 | } | |
364 | break; | |
365 | ||
366 | case GOT_NORMAL: | |
367 | { | |
368 | bfd_vma sec_vma | |
369 | = reloc_data->sym_section->output_section->vma | |
370 | + reloc_data->sym_section->output_offset; | |
371 | ||
372 | if (h->root.type != bfd_link_hash_undefweak) | |
373 | { | |
374 | bfd_put_32 (output_bfd, | |
375 | reloc_data->sym_value + sec_vma, | |
376 | htab->sgot->contents + entry->offset); | |
377 | ||
378 | ARC_DEBUG ("arc_info: PATCHED: %#08lx " | |
379 | "@ %#08lx for sym %s in got offset %#lx\n", | |
380 | (long) (reloc_data->sym_value + sec_vma), | |
381 | (long) (htab->sgot->output_section->vma | |
382 | + htab->sgot->output_offset + entry->offset), | |
383 | symbol_name, | |
384 | (long) entry->offset); | |
385 | } | |
386 | else | |
387 | { | |
388 | ARC_DEBUG ("arc_info: PATCHED: NOT_PATCHED " | |
389 | "@ %#08lx for sym %s in got offset %#lx " | |
390 | "(is undefweak)\n", | |
391 | (long) (htab->sgot->output_section->vma | |
392 | + htab->sgot->output_offset | |
393 | + entry->offset), | |
394 | symbol_name, | |
395 | (long) entry->offset); | |
08759e0f | 396 | } |
f7e8b360 NC |
397 | } |
398 | break; | |
399 | default: | |
400 | BFD_ASSERT (0); | |
401 | break; | |
08759e0f CM |
402 | } |
403 | entry->processed = TRUE; | |
404 | } | |
405 | } | |
406 | ||
407 | return entry->offset; | |
408 | } | |
409 | ||
410 | static void | |
411 | create_got_dynrelocs_for_single_entry (struct got_entry *list, | |
412 | bfd *output_bfd, | |
413 | struct bfd_link_info * info, | |
414 | struct elf_link_hash_entry *h) | |
415 | { | |
416 | if (list == NULL) | |
417 | return; | |
418 | ||
419 | bfd_vma got_offset = list->offset; | |
420 | ||
421 | if (list->type == GOT_NORMAL | |
422 | && list->created_dyn_relocation == FALSE) | |
423 | { | |
424 | if (bfd_link_pic (info) | |
425 | && h != NULL | |
426 | && (info->symbolic || h->dynindx == -1) | |
427 | && h->def_regular) | |
428 | { | |
429 | ADD_RELA (output_bfd, got, got_offset, 0, R_ARC_RELATIVE, 0); | |
430 | } | |
431 | /* Do not fully understand the side effects of this condition. | |
432 | The relocation space might still being reserved. Perhaps | |
433 | I should clear its value. */ | |
434 | else if (h != NULL && h->dynindx != -1) | |
435 | { | |
436 | ADD_RELA (output_bfd, got, got_offset, h->dynindx, R_ARC_GLOB_DAT, 0); | |
437 | } | |
438 | list->created_dyn_relocation = TRUE; | |
439 | } | |
440 | else if (list->existing_entries != TLS_GOT_NONE | |
441 | && list->created_dyn_relocation == FALSE) | |
442 | { | |
443 | /* TODO TLS: This is not called for local symbols. | |
444 | In order to correctly implement TLS, this should also | |
445 | be called for all local symbols with tls got entries. | |
446 | Should be moved to relocate_section in order to make it | |
447 | work for local symbols. */ | |
448 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
449 | enum tls_got_entries e = list->existing_entries; | |
450 | ||
451 | BFD_ASSERT (list->type != GOT_TLS_GD | |
452 | || list->existing_entries == TLS_GOT_MOD_AND_OFF); | |
453 | ||
454 | bfd_vma dynindx = (h == NULL || h->dynindx == -1) ? 0 : h->dynindx; | |
455 | ||
456 | if (e == TLS_GOT_MOD_AND_OFF || e == TLS_GOT_MOD) | |
457 | { | |
458 | ADD_RELA (output_bfd, got, got_offset, dynindx, | |
459 | R_ARC_TLS_DTPMOD, 0); | |
460 | ARC_DEBUG ("arc_info: TLS_DYNRELOC: type = %d, \ | |
f7e8b360 | 461 | GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = 0x0\n", |
08759e0f | 462 | list->type, |
f7e8b360 NC |
463 | (long) got_offset, |
464 | (long) (htab->sgot->output_section->vma | |
465 | + htab->sgot->output_offset + got_offset), | |
466 | (long) dynindx); | |
08759e0f | 467 | } |
f7e8b360 | 468 | |
08759e0f CM |
469 | if (e == TLS_GOT_MOD_AND_OFF || e == TLS_GOT_OFF) |
470 | { | |
471 | bfd_vma addend = 0; | |
472 | if (list->type == GOT_TLS_IE) | |
473 | addend = bfd_get_32 (output_bfd, | |
474 | htab->sgot->contents + got_offset); | |
475 | ||
476 | ADD_RELA (output_bfd, got, | |
477 | got_offset + (e == TLS_GOT_MOD_AND_OFF ? 4 : 0), | |
478 | dynindx, | |
479 | (list->type == GOT_TLS_IE ? R_ARC_TLS_TPOFF | |
480 | : R_ARC_TLS_DTPOFF), | |
481 | addend); | |
482 | ||
483 | ARC_DEBUG ("arc_info: TLS_DYNRELOC: type = %d, \ | |
f7e8b360 | 484 | GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = %#lx\n", |
08759e0f | 485 | list->type, |
f7e8b360 NC |
486 | (long) got_offset, |
487 | (long) (htab->sgot->output_section->vma | |
488 | + htab->sgot->output_offset + got_offset), | |
489 | (long) dynindx, (long) addend); | |
08759e0f CM |
490 | } |
491 | list->created_dyn_relocation = TRUE; | |
492 | } | |
493 | } | |
494 | ||
495 | static void | |
496 | create_got_dynrelocs_for_got_info (struct got_entry **list_p, | |
497 | bfd *output_bfd, | |
498 | struct bfd_link_info * info, | |
499 | struct elf_link_hash_entry *h) | |
500 | { | |
501 | if (list_p == NULL) | |
502 | return; | |
503 | ||
504 | struct got_entry *list = *list_p; | |
505 | /* Traverse the list of got entries for this symbol. */ | |
506 | while (list) | |
507 | { | |
508 | create_got_dynrelocs_for_single_entry (list, output_bfd, info, h); | |
509 | list = list->next; | |
510 | } | |
511 | } | |
512 | ||
513 | #undef ADD_SYMBOL_REF_SEC_AND_RELOC | |
514 | ||
515 | #endif /* ARC_GOT_H */ |