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08759e0f | 1 | /* ARC-specific support for 32-bit ELF |
219d1afa | 2 | Copyright (C) 1994-2018 Free Software Foundation, Inc. |
08759e0f CM |
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 | ||
a0abe743 CM |
25 | #define TCB_SIZE (8) |
26 | ||
08759e0f CM |
27 | enum tls_type_e |
28 | { | |
29 | GOT_UNKNOWN = 0, | |
30 | GOT_NORMAL, | |
31 | GOT_TLS_GD, | |
32 | GOT_TLS_IE, | |
33 | GOT_TLS_LE | |
34 | }; | |
35 | ||
36 | enum tls_got_entries | |
37 | { | |
38 | TLS_GOT_NONE = 0, | |
39 | TLS_GOT_MOD, | |
40 | TLS_GOT_OFF, | |
41 | TLS_GOT_MOD_AND_OFF | |
42 | }; | |
43 | ||
44 | struct got_entry | |
45 | { | |
46 | struct got_entry *next; | |
47 | enum tls_type_e type; | |
48 | bfd_vma offset; | |
49 | bfd_boolean processed; | |
50 | bfd_boolean created_dyn_relocation; | |
51 | enum tls_got_entries existing_entries; | |
52 | }; | |
53 | ||
54 | static struct got_entry ** | |
55 | arc_get_local_got_ents (bfd * abfd) | |
56 | { | |
57 | static struct got_entry **local_got_ents = NULL; | |
58 | ||
59 | if (local_got_ents == NULL) | |
60 | { | |
61 | size_t size; | |
62 | Elf_Internal_Shdr *symtab_hdr = &((elf_tdata (abfd))->symtab_hdr); | |
63 | ||
64 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
65 | local_got_ents = (struct got_entry **) | |
66 | bfd_alloc (abfd, sizeof (struct got_entry *) * size); | |
67 | if (local_got_ents == NULL) | |
68 | return FALSE; | |
69 | ||
70 | memset (local_got_ents, 0, sizeof (struct got_entry *) * size); | |
71 | elf_local_got_ents (abfd) = local_got_ents; | |
72 | } | |
73 | ||
74 | return local_got_ents; | |
75 | } | |
76 | ||
77 | static struct got_entry * | |
78 | got_entry_for_type (struct got_entry **list, | |
79 | enum tls_type_e type) | |
80 | { | |
81 | struct got_entry **p = list; | |
f7e8b360 | 82 | |
08759e0f CM |
83 | while (*p != NULL) |
84 | { | |
85 | if ((*p)->type == type) | |
86 | return *p; | |
87 | p = &((*p)->next); | |
88 | } | |
89 | return NULL; | |
90 | } | |
91 | ||
92 | static void | |
93 | new_got_entry_to_list (struct got_entry **list, | |
94 | enum tls_type_e type, | |
95 | bfd_vma offset, | |
96 | enum tls_got_entries existing_entries) | |
97 | { | |
98 | /* Find list end. Avoid having multiple entries of the same | |
99 | type. */ | |
100 | struct got_entry **p = list; | |
f7e8b360 NC |
101 | struct got_entry *entry; |
102 | ||
08759e0f CM |
103 | while (*p != NULL) |
104 | { | |
105 | if ((*p)->type == type) | |
106 | return; | |
107 | p = &((*p)->next); | |
108 | } | |
109 | ||
f7e8b360 | 110 | entry = (struct got_entry *) xmalloc (sizeof (struct got_entry)); |
08759e0f CM |
111 | |
112 | entry->type = type; | |
113 | entry->offset = offset; | |
114 | entry->next = NULL; | |
115 | entry->processed = FALSE; | |
116 | entry->created_dyn_relocation = FALSE; | |
117 | entry->existing_entries = existing_entries; | |
118 | ||
119 | ARC_DEBUG ("New GOT got entry added to list: " | |
f7e8b360 NC |
120 | "type: %d, offset: %ld, existing_entries: %d\n", |
121 | type, (long) offset, existing_entries); | |
08759e0f CM |
122 | |
123 | /* Add the entry to the end of the list. */ | |
124 | *p = entry; | |
125 | } | |
126 | ||
127 | static enum tls_type_e | |
128 | tls_type_for_reloc (reloc_howto_type *howto) | |
129 | { | |
130 | enum tls_type_e ret = GOT_UNKNOWN; | |
f7e8b360 | 131 | |
08759e0f | 132 | if (is_reloc_for_GOT (howto)) |
f7e8b360 NC |
133 | return GOT_NORMAL; |
134 | ||
135 | switch (howto->type) | |
08759e0f | 136 | { |
f7e8b360 NC |
137 | case R_ARC_TLS_GD_GOT: |
138 | ret = GOT_TLS_GD; | |
139 | break; | |
140 | case R_ARC_TLS_IE_GOT: | |
141 | ret = GOT_TLS_IE; | |
142 | break; | |
143 | case R_ARC_TLS_LE_32: | |
144 | ret = GOT_TLS_LE; | |
145 | break; | |
146 | default: | |
147 | ret = GOT_UNKNOWN; | |
148 | break; | |
08759e0f | 149 | } |
f7e8b360 | 150 | |
08759e0f CM |
151 | return ret; |
152 | }; | |
153 | ||
154 | static struct got_entry ** | |
155 | get_got_entry_list_for_symbol (bfd *abfd, | |
156 | unsigned long r_symndx, | |
157 | struct elf_link_hash_entry *h) | |
158 | { | |
159 | if (h != NULL) | |
160 | { | |
161 | return &h->got.glist; | |
162 | } | |
163 | else | |
164 | { | |
165 | struct got_entry **local_got_ents | |
166 | = arc_get_local_got_ents (abfd); | |
167 | return &local_got_ents[r_symndx]; | |
168 | } | |
169 | } | |
170 | ||
171 | ||
172 | static enum tls_type_e | |
173 | arc_got_entry_type_for_reloc (reloc_howto_type *howto) | |
174 | { | |
175 | enum tls_type_e type = GOT_UNKNOWN; | |
176 | ||
177 | if (is_reloc_for_GOT (howto)) | |
f7e8b360 NC |
178 | return GOT_NORMAL; |
179 | ||
180 | if (is_reloc_for_TLS (howto)) | |
08759e0f CM |
181 | { |
182 | switch (howto->type) | |
183 | { | |
184 | case R_ARC_TLS_GD_GOT: | |
185 | type = GOT_TLS_GD; | |
186 | break; | |
187 | case R_ARC_TLS_IE_GOT: | |
188 | type = GOT_TLS_IE; | |
189 | break; | |
190 | default: | |
191 | break; | |
192 | } | |
193 | } | |
194 | return type; | |
195 | } | |
196 | ||
197 | #define ADD_SYMBOL_REF_SEC_AND_RELOC(SECNAME, COND_FOR_RELOC, H) \ | |
198 | htab->s##SECNAME->size; \ | |
199 | { \ | |
200 | if (COND_FOR_RELOC) \ | |
201 | { \ | |
202 | htab->srel##SECNAME->size += sizeof (Elf32_External_Rela); \ | |
203 | ARC_DEBUG ("arc_info: Added reloc space in " \ | |
204 | #SECNAME " section at " __FILE__ \ | |
205 | ":%d for symbol %s\n", \ | |
206 | __LINE__, name_for_global_symbol (H)); \ | |
207 | } \ | |
208 | if (H) \ | |
209 | if (h->dynindx == -1 && !h->forced_local) \ | |
210 | if (! bfd_elf_link_record_dynamic_symbol (info, H)) \ | |
211 | return FALSE; \ | |
212 | htab->s##SECNAME->size += 4; \ | |
213 | } \ | |
214 | ||
215 | static bfd_boolean | |
216 | arc_fill_got_info_for_reloc (enum tls_type_e type, | |
217 | struct got_entry **list, | |
218 | struct bfd_link_info * info, | |
219 | struct elf_link_hash_entry *h) | |
220 | { | |
221 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
222 | ||
223 | if (got_entry_for_type (list, type) != NULL) | |
224 | return TRUE; | |
225 | ||
226 | switch (type) | |
227 | { | |
228 | case GOT_NORMAL: | |
229 | { | |
07d6d2b8 | 230 | bfd_vma offset |
08759e0f CM |
231 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, bfd_link_pic (info) |
232 | || h != NULL, h); | |
07d6d2b8 | 233 | new_got_entry_to_list (list, type, offset, TLS_GOT_NONE); |
08759e0f CM |
234 | } |
235 | break; | |
236 | ||
237 | ||
238 | case GOT_TLS_GD: | |
239 | { | |
240 | bfd_vma offset | |
241 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, TRUE, h); | |
242 | bfd_vma ATTRIBUTE_UNUSED notneeded | |
243 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, TRUE, h); | |
244 | new_got_entry_to_list (list, type, offset, TLS_GOT_MOD_AND_OFF); | |
245 | } | |
246 | break; | |
247 | case GOT_TLS_IE: | |
248 | case GOT_TLS_LE: | |
249 | { | |
250 | bfd_vma offset | |
251 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, TRUE, h); | |
252 | new_got_entry_to_list (list, type, offset, TLS_GOT_OFF); | |
253 | } | |
254 | break; | |
255 | ||
256 | default: | |
257 | return FALSE; | |
258 | break; | |
259 | } | |
260 | return TRUE; | |
261 | } | |
262 | ||
263 | ||
264 | static bfd_vma | |
07d6d2b8 AM |
265 | relocate_fix_got_relocs_for_got_info (struct got_entry ** list_p, |
266 | enum tls_type_e type, | |
267 | struct bfd_link_info * info, | |
268 | bfd * output_bfd, | |
269 | unsigned long r_symndx, | |
270 | Elf_Internal_Sym * local_syms, | |
271 | asection ** local_sections, | |
272 | struct elf_link_hash_entry * h, | |
f7e8b360 | 273 | struct arc_relocation_data * reloc_data) |
08759e0f | 274 | { |
f7e8b360 NC |
275 | struct elf_link_hash_table *htab = elf_hash_table (info); |
276 | struct got_entry *entry = NULL; | |
08759e0f CM |
277 | |
278 | if (list_p == NULL || type == GOT_UNKNOWN || type == GOT_TLS_LE) | |
279 | return 0; | |
280 | ||
08759e0f CM |
281 | entry = got_entry_for_type (list_p, type); |
282 | BFD_ASSERT (entry); | |
283 | ||
284 | if (h == NULL | |
285 | || (! elf_hash_table (info)->dynamic_sections_created | |
286 | || (bfd_link_pic (info) | |
f7e8b360 | 287 | && SYMBOL_REFERENCES_LOCAL (info, h)))) |
08759e0f CM |
288 | { |
289 | const char ATTRIBUTE_UNUSED *symbol_name; | |
290 | static const char local_name[] = "(local)"; | |
291 | asection *tls_sec = NULL; | |
292 | bfd_vma sym_value = 0; | |
293 | ||
294 | if (h != NULL) | |
295 | { | |
296 | // TODO: This should not be here. | |
297 | reloc_data->sym_value = h->root.u.def.value; | |
298 | reloc_data->sym_section = h->root.u.def.section; | |
299 | ||
300 | sym_value = h->root.u.def.value | |
f7e8b360 NC |
301 | + h->root.u.def.section->output_section->vma |
302 | + h->root.u.def.section->output_offset; | |
08759e0f CM |
303 | |
304 | tls_sec = elf_hash_table (info)->tls_sec; | |
305 | ||
306 | symbol_name = h->root.root.string; | |
307 | } | |
308 | else | |
309 | { | |
310 | Elf_Internal_Sym *sym = local_syms + r_symndx; | |
311 | asection *sec = local_sections[r_symndx]; | |
312 | ||
313 | sym_value = sym->st_value | |
f7e8b360 NC |
314 | + sec->output_section->vma |
315 | + sec->output_offset; | |
08759e0f CM |
316 | |
317 | tls_sec = elf_hash_table (info)->tls_sec; | |
318 | ||
319 | symbol_name = local_name; | |
320 | } | |
321 | ||
322 | ||
535b785f | 323 | if (entry && !entry->processed) |
08759e0f CM |
324 | { |
325 | switch (entry->type) | |
326 | { | |
f7e8b360 NC |
327 | case GOT_TLS_GD: |
328 | { | |
329 | BFD_ASSERT (tls_sec && tls_sec->output_section); | |
330 | bfd_vma sec_vma = tls_sec->output_section->vma; | |
331 | ||
332 | bfd_put_32 (output_bfd, | |
333 | sym_value - sec_vma, | |
334 | htab->sgot->contents + entry->offset | |
335 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF | |
336 | ? 4 : 0)); | |
337 | ||
338 | ARC_DEBUG ("arc_info: FIXED -> %s value = %#lx " | |
4dd72ffd | 339 | "@ %lx, for symbol %s\n", |
f7e8b360 NC |
340 | (entry->type == GOT_TLS_GD ? "GOT_TLS_GD" : |
341 | "GOT_TLS_IE"), | |
342 | (long) (sym_value - sec_vma), | |
4dd72ffd CM |
343 | (long) (htab->sgot->output_section->vma |
344 | + htab->sgot->output_offset->vma | |
345 | + entry->offset | |
346 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF | |
347 | ? 4 : 0)), | |
f7e8b360 NC |
348 | symbol_name); |
349 | } | |
350 | break; | |
351 | ||
352 | case GOT_TLS_IE: | |
353 | { | |
354 | BFD_ASSERT (tls_sec && tls_sec->output_section); | |
355 | bfd_vma ATTRIBUTE_UNUSED sec_vma | |
356 | = tls_sec->output_section->vma; | |
357 | ||
4dd72ffd | 358 | bfd_put_32 (output_bfd, |
a0abe743 CM |
359 | sym_value - sec_vma |
360 | + (elf_hash_table (info)->dynamic_sections_created ? 0 : TCB_SIZE), | |
4dd72ffd CM |
361 | htab->sgot->contents + entry->offset |
362 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF | |
363 | ? 4 : 0)); | |
364 | ||
f7e8b360 NC |
365 | ARC_DEBUG ("arc_info: FIXED -> %s value = %#lx " |
366 | "@ %p, for symbol %s\n", | |
367 | (entry->type == GOT_TLS_GD ? "GOT_TLS_GD" : | |
368 | "GOT_TLS_IE"), | |
369 | (long) (sym_value - sec_vma), | |
4dd72ffd CM |
370 | (long) (htab->sgot->output_section->vma |
371 | + htab->sgot->output_offset->vma | |
372 | + entry->offset | |
373 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF | |
374 | ? 4 : 0)), | |
f7e8b360 NC |
375 | symbol_name); |
376 | } | |
377 | break; | |
378 | ||
379 | case GOT_NORMAL: | |
380 | { | |
381 | bfd_vma sec_vma | |
382 | = reloc_data->sym_section->output_section->vma | |
383 | + reloc_data->sym_section->output_offset; | |
384 | ||
c02d11a5 CM |
385 | if (h != NULL |
386 | && h->root.type == bfd_link_hash_undefweak) | |
387 | ARC_DEBUG ("arc_info: PATCHED: NOT_PATCHED " | |
388 | "@ %#08lx for sym %s in got offset %#lx " | |
389 | "(is undefweak)\n", | |
390 | (long) (htab->sgot->output_section->vma | |
391 | + htab->sgot->output_offset | |
392 | + entry->offset), | |
393 | symbol_name, | |
394 | (long) entry->offset); | |
395 | else | |
f7e8b360 NC |
396 | { |
397 | bfd_put_32 (output_bfd, | |
398 | reloc_data->sym_value + sec_vma, | |
399 | htab->sgot->contents + entry->offset); | |
f7e8b360 NC |
400 | ARC_DEBUG ("arc_info: PATCHED: %#08lx " |
401 | "@ %#08lx for sym %s in got offset %#lx\n", | |
402 | (long) (reloc_data->sym_value + sec_vma), | |
403 | (long) (htab->sgot->output_section->vma | |
404 | + htab->sgot->output_offset + entry->offset), | |
405 | symbol_name, | |
406 | (long) entry->offset); | |
407 | } | |
f7e8b360 NC |
408 | } |
409 | break; | |
410 | default: | |
411 | BFD_ASSERT (0); | |
412 | break; | |
08759e0f CM |
413 | } |
414 | entry->processed = TRUE; | |
415 | } | |
416 | } | |
417 | ||
418 | return entry->offset; | |
419 | } | |
420 | ||
421 | static void | |
422 | create_got_dynrelocs_for_single_entry (struct got_entry *list, | |
423 | bfd *output_bfd, | |
424 | struct bfd_link_info * info, | |
425 | struct elf_link_hash_entry *h) | |
426 | { | |
427 | if (list == NULL) | |
428 | return; | |
429 | ||
430 | bfd_vma got_offset = list->offset; | |
431 | ||
432 | if (list->type == GOT_NORMAL | |
535b785f | 433 | && !list->created_dyn_relocation) |
08759e0f CM |
434 | { |
435 | if (bfd_link_pic (info) | |
436 | && h != NULL | |
437 | && (info->symbolic || h->dynindx == -1) | |
438 | && h->def_regular) | |
439 | { | |
440 | ADD_RELA (output_bfd, got, got_offset, 0, R_ARC_RELATIVE, 0); | |
441 | } | |
442 | /* Do not fully understand the side effects of this condition. | |
443 | The relocation space might still being reserved. Perhaps | |
444 | I should clear its value. */ | |
445 | else if (h != NULL && h->dynindx != -1) | |
446 | { | |
447 | ADD_RELA (output_bfd, got, got_offset, h->dynindx, R_ARC_GLOB_DAT, 0); | |
448 | } | |
449 | list->created_dyn_relocation = TRUE; | |
450 | } | |
451 | else if (list->existing_entries != TLS_GOT_NONE | |
535b785f | 452 | && !list->created_dyn_relocation) |
08759e0f CM |
453 | { |
454 | /* TODO TLS: This is not called for local symbols. | |
455 | In order to correctly implement TLS, this should also | |
456 | be called for all local symbols with tls got entries. | |
457 | Should be moved to relocate_section in order to make it | |
458 | work for local symbols. */ | |
459 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
460 | enum tls_got_entries e = list->existing_entries; | |
461 | ||
462 | BFD_ASSERT (list->type != GOT_TLS_GD | |
07d6d2b8 | 463 | || list->existing_entries == TLS_GOT_MOD_AND_OFF); |
08759e0f CM |
464 | |
465 | bfd_vma dynindx = (h == NULL || h->dynindx == -1) ? 0 : h->dynindx; | |
466 | ||
467 | if (e == TLS_GOT_MOD_AND_OFF || e == TLS_GOT_MOD) | |
468 | { | |
469 | ADD_RELA (output_bfd, got, got_offset, dynindx, | |
07d6d2b8 | 470 | R_ARC_TLS_DTPMOD, 0); |
08759e0f | 471 | ARC_DEBUG ("arc_info: TLS_DYNRELOC: type = %d, \ |
f7e8b360 | 472 | GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = 0x0\n", |
08759e0f | 473 | list->type, |
f7e8b360 NC |
474 | (long) got_offset, |
475 | (long) (htab->sgot->output_section->vma | |
476 | + htab->sgot->output_offset + got_offset), | |
477 | (long) dynindx); | |
08759e0f | 478 | } |
f7e8b360 | 479 | |
08759e0f CM |
480 | if (e == TLS_GOT_MOD_AND_OFF || e == TLS_GOT_OFF) |
481 | { | |
482 | bfd_vma addend = 0; | |
483 | if (list->type == GOT_TLS_IE) | |
a0abe743 | 484 | { |
08759e0f CM |
485 | addend = bfd_get_32 (output_bfd, |
486 | htab->sgot->contents + got_offset); | |
a0abe743 | 487 | } |
08759e0f CM |
488 | |
489 | ADD_RELA (output_bfd, got, | |
490 | got_offset + (e == TLS_GOT_MOD_AND_OFF ? 4 : 0), | |
491 | dynindx, | |
492 | (list->type == GOT_TLS_IE ? R_ARC_TLS_TPOFF | |
493 | : R_ARC_TLS_DTPOFF), | |
494 | addend); | |
495 | ||
496 | ARC_DEBUG ("arc_info: TLS_DYNRELOC: type = %d, \ | |
f7e8b360 | 497 | GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = %#lx\n", |
08759e0f | 498 | list->type, |
f7e8b360 NC |
499 | (long) got_offset, |
500 | (long) (htab->sgot->output_section->vma | |
501 | + htab->sgot->output_offset + got_offset), | |
502 | (long) dynindx, (long) addend); | |
08759e0f CM |
503 | } |
504 | list->created_dyn_relocation = TRUE; | |
505 | } | |
506 | } | |
507 | ||
508 | static void | |
509 | create_got_dynrelocs_for_got_info (struct got_entry **list_p, | |
510 | bfd *output_bfd, | |
511 | struct bfd_link_info * info, | |
07d6d2b8 | 512 | struct elf_link_hash_entry *h) |
08759e0f CM |
513 | { |
514 | if (list_p == NULL) | |
515 | return; | |
516 | ||
517 | struct got_entry *list = *list_p; | |
518 | /* Traverse the list of got entries for this symbol. */ | |
519 | while (list) | |
520 | { | |
521 | create_got_dynrelocs_for_single_entry (list, output_bfd, info, h); | |
522 | list = list->next; | |
523 | } | |
524 | } | |
525 | ||
526 | #undef ADD_SYMBOL_REF_SEC_AND_RELOC | |
527 | ||
528 | #endif /* ARC_GOT_H */ |