| 1 | /* ARC-specific support for 32-bit ELF |
| 2 | Copyright (C) 1994-2018 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 | #define TCB_SIZE (8) |
| 26 | |
| 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; |
| 82 | |
| 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; |
| 101 | struct got_entry *entry; |
| 102 | |
| 103 | while (*p != NULL) |
| 104 | { |
| 105 | if ((*p)->type == type) |
| 106 | return; |
| 107 | p = &((*p)->next); |
| 108 | } |
| 109 | |
| 110 | entry = (struct got_entry *) xmalloc (sizeof (struct got_entry)); |
| 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: " |
| 120 | "type: %d, offset: %ld, existing_entries: %d\n", |
| 121 | type, (long) offset, existing_entries); |
| 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; |
| 131 | |
| 132 | if (is_reloc_for_GOT (howto)) |
| 133 | return GOT_NORMAL; |
| 134 | |
| 135 | switch (howto->type) |
| 136 | { |
| 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; |
| 149 | } |
| 150 | |
| 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)) |
| 178 | return GOT_NORMAL; |
| 179 | |
| 180 | if (is_reloc_for_TLS (howto)) |
| 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 | { |
| 230 | bfd_vma offset |
| 231 | = ADD_SYMBOL_REF_SEC_AND_RELOC (got, bfd_link_pic (info) |
| 232 | || h != NULL, h); |
| 233 | new_got_entry_to_list (list, type, offset, TLS_GOT_NONE); |
| 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 |
| 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, |
| 273 | struct arc_relocation_data * reloc_data) |
| 274 | { |
| 275 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 276 | struct got_entry *entry = NULL; |
| 277 | |
| 278 | if (list_p == NULL || type == GOT_UNKNOWN || type == GOT_TLS_LE) |
| 279 | return 0; |
| 280 | |
| 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) |
| 287 | && SYMBOL_REFERENCES_LOCAL (info, h)))) |
| 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 |
| 301 | + h->root.u.def.section->output_section->vma |
| 302 | + h->root.u.def.section->output_offset; |
| 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 |
| 314 | + sec->output_section->vma |
| 315 | + sec->output_offset; |
| 316 | |
| 317 | tls_sec = elf_hash_table (info)->tls_sec; |
| 318 | |
| 319 | symbol_name = local_name; |
| 320 | } |
| 321 | |
| 322 | |
| 323 | if (entry && !entry->processed) |
| 324 | { |
| 325 | switch (entry->type) |
| 326 | { |
| 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 " |
| 339 | "@ %lx, for symbol %s\n", |
| 340 | (entry->type == GOT_TLS_GD ? "GOT_TLS_GD" : |
| 341 | "GOT_TLS_IE"), |
| 342 | (long) (sym_value - sec_vma), |
| 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)), |
| 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 | |
| 358 | bfd_put_32 (output_bfd, |
| 359 | sym_value - sec_vma |
| 360 | + (elf_hash_table (info)->dynamic_sections_created ? 0 : TCB_SIZE), |
| 361 | htab->sgot->contents + entry->offset |
| 362 | + (entry->existing_entries == TLS_GOT_MOD_AND_OFF |
| 363 | ? 4 : 0)); |
| 364 | |
| 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), |
| 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)), |
| 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 | |
| 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 |
| 396 | { |
| 397 | bfd_put_32 (output_bfd, |
| 398 | reloc_data->sym_value + sec_vma, |
| 399 | htab->sgot->contents + entry->offset); |
| 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 | } |
| 408 | } |
| 409 | break; |
| 410 | default: |
| 411 | BFD_ASSERT (0); |
| 412 | break; |
| 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 |
| 433 | && !list->created_dyn_relocation) |
| 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 |
| 452 | && !list->created_dyn_relocation) |
| 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 |
| 463 | || list->existing_entries == TLS_GOT_MOD_AND_OFF); |
| 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, |
| 470 | R_ARC_TLS_DTPMOD, 0); |
| 471 | ARC_DEBUG ("arc_info: TLS_DYNRELOC: type = %d, \ |
| 472 | GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = 0x0\n", |
| 473 | list->type, |
| 474 | (long) got_offset, |
| 475 | (long) (htab->sgot->output_section->vma |
| 476 | + htab->sgot->output_offset + got_offset), |
| 477 | (long) dynindx); |
| 478 | } |
| 479 | |
| 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) |
| 484 | { |
| 485 | addend = bfd_get_32 (output_bfd, |
| 486 | htab->sgot->contents + got_offset); |
| 487 | } |
| 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, \ |
| 497 | GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = %#lx\n", |
| 498 | list->type, |
| 499 | (long) got_offset, |
| 500 | (long) (htab->sgot->output_section->vma |
| 501 | + htab->sgot->output_offset + got_offset), |
| 502 | (long) dynindx, (long) addend); |
| 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, |
| 512 | struct elf_link_hash_entry *h) |
| 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 */ |