| 1 | /* ELF program property support. |
| 2 | Copyright (C) 2017-2020 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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | /* GNU program property draft is at: |
| 22 | |
| 23 | https://github.com/hjl-tools/linux-abi/wiki/property-draft.pdf |
| 24 | */ |
| 25 | |
| 26 | #include "sysdep.h" |
| 27 | #include "bfd.h" |
| 28 | #include "libbfd.h" |
| 29 | #include "elf-bfd.h" |
| 30 | |
| 31 | /* Get a property, allocate a new one if needed. */ |
| 32 | |
| 33 | elf_property * |
| 34 | _bfd_elf_get_property (bfd *abfd, unsigned int type, unsigned int datasz) |
| 35 | { |
| 36 | elf_property_list *p, **lastp; |
| 37 | |
| 38 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 39 | { |
| 40 | /* Never should happen. */ |
| 41 | abort (); |
| 42 | } |
| 43 | |
| 44 | /* Keep the property list in order of type. */ |
| 45 | lastp = &elf_properties (abfd); |
| 46 | for (p = *lastp; p; p = p->next) |
| 47 | { |
| 48 | /* Reuse the existing entry. */ |
| 49 | if (type == p->property.pr_type) |
| 50 | { |
| 51 | if (datasz > p->property.pr_datasz) |
| 52 | { |
| 53 | /* This can happen when mixing 32-bit and 64-bit objects. */ |
| 54 | p->property.pr_datasz = datasz; |
| 55 | } |
| 56 | return &p->property; |
| 57 | } |
| 58 | else if (type < p->property.pr_type) |
| 59 | break; |
| 60 | lastp = &p->next; |
| 61 | } |
| 62 | p = (elf_property_list *) bfd_alloc (abfd, sizeof (*p)); |
| 63 | if (p == NULL) |
| 64 | { |
| 65 | _bfd_error_handler (_("%pB: out of memory in _bfd_elf_get_property"), |
| 66 | abfd); |
| 67 | _exit (EXIT_FAILURE); |
| 68 | } |
| 69 | memset (p, 0, sizeof (*p)); |
| 70 | p->property.pr_type = type; |
| 71 | p->property.pr_datasz = datasz; |
| 72 | p->next = *lastp; |
| 73 | *lastp = p; |
| 74 | return &p->property; |
| 75 | } |
| 76 | |
| 77 | /* Parse GNU properties. */ |
| 78 | |
| 79 | bfd_boolean |
| 80 | _bfd_elf_parse_gnu_properties (bfd *abfd, Elf_Internal_Note *note) |
| 81 | { |
| 82 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 83 | unsigned int align_size = bed->s->elfclass == ELFCLASS64 ? 8 : 4; |
| 84 | bfd_byte *ptr = (bfd_byte *) note->descdata; |
| 85 | bfd_byte *ptr_end = ptr + note->descsz; |
| 86 | |
| 87 | if (note->descsz < 8 || (note->descsz % align_size) != 0) |
| 88 | { |
| 89 | bad_size: |
| 90 | _bfd_error_handler |
| 91 | (_("warning: %pB: corrupt GNU_PROPERTY_TYPE (%ld) size: %#lx"), |
| 92 | abfd, note->type, note->descsz); |
| 93 | return FALSE; |
| 94 | } |
| 95 | |
| 96 | while (ptr != ptr_end) |
| 97 | { |
| 98 | unsigned int type; |
| 99 | unsigned int datasz; |
| 100 | elf_property *prop; |
| 101 | |
| 102 | if ((size_t) (ptr_end - ptr) < 8) |
| 103 | goto bad_size; |
| 104 | |
| 105 | type = bfd_h_get_32 (abfd, ptr); |
| 106 | datasz = bfd_h_get_32 (abfd, ptr + 4); |
| 107 | ptr += 8; |
| 108 | |
| 109 | if (datasz > (size_t) (ptr_end - ptr)) |
| 110 | { |
| 111 | _bfd_error_handler |
| 112 | (_("warning: %pB: corrupt GNU_PROPERTY_TYPE (%ld) type (0x%x) datasz: 0x%x"), |
| 113 | abfd, note->type, type, datasz); |
| 114 | /* Clear all properties. */ |
| 115 | elf_properties (abfd) = NULL; |
| 116 | return FALSE; |
| 117 | } |
| 118 | |
| 119 | if (type >= GNU_PROPERTY_LOPROC) |
| 120 | { |
| 121 | if (bed->elf_machine_code == EM_NONE) |
| 122 | { |
| 123 | /* Ignore processor-specific properties with generic ELF |
| 124 | target vector. They should be handled by the matching |
| 125 | ELF target vector. */ |
| 126 | goto next; |
| 127 | } |
| 128 | else if (type < GNU_PROPERTY_LOUSER |
| 129 | && bed->parse_gnu_properties) |
| 130 | { |
| 131 | enum elf_property_kind kind |
| 132 | = bed->parse_gnu_properties (abfd, type, ptr, datasz); |
| 133 | if (kind == property_corrupt) |
| 134 | { |
| 135 | /* Clear all properties. */ |
| 136 | elf_properties (abfd) = NULL; |
| 137 | return FALSE; |
| 138 | } |
| 139 | else if (kind != property_ignored) |
| 140 | goto next; |
| 141 | } |
| 142 | } |
| 143 | else |
| 144 | { |
| 145 | switch (type) |
| 146 | { |
| 147 | case GNU_PROPERTY_STACK_SIZE: |
| 148 | if (datasz != align_size) |
| 149 | { |
| 150 | _bfd_error_handler |
| 151 | (_("warning: %pB: corrupt stack size: 0x%x"), |
| 152 | abfd, datasz); |
| 153 | /* Clear all properties. */ |
| 154 | elf_properties (abfd) = NULL; |
| 155 | return FALSE; |
| 156 | } |
| 157 | prop = _bfd_elf_get_property (abfd, type, datasz); |
| 158 | if (datasz == 8) |
| 159 | prop->u.number = bfd_h_get_64 (abfd, ptr); |
| 160 | else |
| 161 | prop->u.number = bfd_h_get_32 (abfd, ptr); |
| 162 | prop->pr_kind = property_number; |
| 163 | goto next; |
| 164 | |
| 165 | case GNU_PROPERTY_NO_COPY_ON_PROTECTED: |
| 166 | if (datasz != 0) |
| 167 | { |
| 168 | _bfd_error_handler |
| 169 | (_("warning: %pB: corrupt no copy on protected size: 0x%x"), |
| 170 | abfd, datasz); |
| 171 | /* Clear all properties. */ |
| 172 | elf_properties (abfd) = NULL; |
| 173 | return FALSE; |
| 174 | } |
| 175 | prop = _bfd_elf_get_property (abfd, type, datasz); |
| 176 | elf_has_no_copy_on_protected (abfd) = TRUE; |
| 177 | prop->pr_kind = property_number; |
| 178 | goto next; |
| 179 | |
| 180 | default: |
| 181 | break; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | _bfd_error_handler |
| 186 | (_("warning: %pB: unsupported GNU_PROPERTY_TYPE (%ld) type: 0x%x"), |
| 187 | abfd, note->type, type); |
| 188 | |
| 189 | next: |
| 190 | ptr += (datasz + (align_size - 1)) & ~ (align_size - 1); |
| 191 | } |
| 192 | |
| 193 | return TRUE; |
| 194 | } |
| 195 | |
| 196 | /* Merge GNU property BPROP with APROP. If APROP isn't NULL, return TRUE |
| 197 | if APROP is updated. Otherwise, return TRUE if BPROP should be merged |
| 198 | with ABFD. */ |
| 199 | |
| 200 | static bfd_boolean |
| 201 | elf_merge_gnu_properties (struct bfd_link_info *info, bfd *abfd, bfd *bbfd, |
| 202 | elf_property *aprop, elf_property *bprop) |
| 203 | { |
| 204 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 205 | unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type; |
| 206 | |
| 207 | if (bed->merge_gnu_properties != NULL |
| 208 | && pr_type >= GNU_PROPERTY_LOPROC |
| 209 | && pr_type < GNU_PROPERTY_LOUSER) |
| 210 | return bed->merge_gnu_properties (info, abfd, bbfd, aprop, bprop); |
| 211 | |
| 212 | switch (pr_type) |
| 213 | { |
| 214 | case GNU_PROPERTY_STACK_SIZE: |
| 215 | if (aprop != NULL && bprop != NULL) |
| 216 | { |
| 217 | if (bprop->u.number > aprop->u.number) |
| 218 | { |
| 219 | aprop->u.number = bprop->u.number; |
| 220 | return TRUE; |
| 221 | } |
| 222 | break; |
| 223 | } |
| 224 | /* FALLTHROUGH */ |
| 225 | |
| 226 | case GNU_PROPERTY_NO_COPY_ON_PROTECTED: |
| 227 | /* Return TRUE if APROP is NULL to indicate that BPROP should |
| 228 | be added to ABFD. */ |
| 229 | return aprop == NULL; |
| 230 | |
| 231 | default: |
| 232 | /* Never should happen. */ |
| 233 | abort (); |
| 234 | } |
| 235 | |
| 236 | return FALSE; |
| 237 | } |
| 238 | |
| 239 | /* Return the property of TYPE on *LISTP and remove it from *LISTP if RM is |
| 240 | true. Return NULL if not found. */ |
| 241 | |
| 242 | static elf_property * |
| 243 | elf_find_and_remove_property (elf_property_list **listp, |
| 244 | unsigned int type, bfd_boolean rm) |
| 245 | { |
| 246 | elf_property_list *list; |
| 247 | |
| 248 | for (list = *listp; list; list = list->next) |
| 249 | { |
| 250 | if (type == list->property.pr_type) |
| 251 | { |
| 252 | /* Remove this property. */ |
| 253 | if (rm) |
| 254 | *listp = list->next; |
| 255 | return &list->property; |
| 256 | } |
| 257 | else if (type < list->property.pr_type) |
| 258 | break; |
| 259 | listp = &list->next; |
| 260 | } |
| 261 | |
| 262 | return NULL; |
| 263 | } |
| 264 | |
| 265 | /* Merge GNU property list *LISTP in ABFD with FIRST_PBFD. */ |
| 266 | |
| 267 | static void |
| 268 | elf_merge_gnu_property_list (struct bfd_link_info *info, bfd *first_pbfd, |
| 269 | bfd *abfd, elf_property_list **listp) |
| 270 | { |
| 271 | elf_property_list *p, **lastp; |
| 272 | elf_property *pr; |
| 273 | bfd_boolean number_p; |
| 274 | bfd_vma number = 0; |
| 275 | |
| 276 | /* Merge each GNU property in FIRST_PBFD with the one on *LISTP. */ |
| 277 | lastp = &elf_properties (first_pbfd); |
| 278 | for (p = *lastp; p; p = p->next) |
| 279 | if (p->property.pr_kind != property_remove) |
| 280 | { |
| 281 | if (p->property.pr_kind == property_number) |
| 282 | { |
| 283 | number_p = TRUE; |
| 284 | number = p->property.u.number; |
| 285 | } |
| 286 | else |
| 287 | number_p = FALSE; |
| 288 | pr = elf_find_and_remove_property (listp, p->property.pr_type, |
| 289 | TRUE); |
| 290 | /* Pass NULL to elf_merge_gnu_properties for the property which |
| 291 | isn't on *LISTP. */ |
| 292 | elf_merge_gnu_properties (info, first_pbfd, abfd, &p->property, pr); |
| 293 | if (p->property.pr_kind == property_remove) |
| 294 | { |
| 295 | if (info->has_map_file) |
| 296 | { |
| 297 | if (number_p) |
| 298 | { |
| 299 | if (pr != NULL) |
| 300 | info->callbacks->minfo |
| 301 | (_("Removed property %W to merge %pB (0x%v) " |
| 302 | "and %pB (0x%v)\n"), |
| 303 | (bfd_vma) p->property.pr_type, first_pbfd, |
| 304 | number, abfd, pr->u.number); |
| 305 | else |
| 306 | info->callbacks->minfo |
| 307 | (_("Removed property %W to merge %pB (0x%v) " |
| 308 | "and %pB (not found)\n"), |
| 309 | (bfd_vma) p->property.pr_type, first_pbfd, |
| 310 | number, abfd); |
| 311 | } |
| 312 | else |
| 313 | { |
| 314 | if (pr != NULL) |
| 315 | info->callbacks->minfo |
| 316 | (_("Removed property %W to merge %pB and %pB\n"), |
| 317 | (bfd_vma) p->property.pr_type, first_pbfd, abfd); |
| 318 | else |
| 319 | info->callbacks->minfo |
| 320 | (_("Removed property %W to merge %pB and %pB " |
| 321 | "(not found)\n"), |
| 322 | (bfd_vma) p->property.pr_type, first_pbfd, abfd); |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | /* Remove this property. */ |
| 327 | *lastp = p->next; |
| 328 | continue; |
| 329 | } |
| 330 | else if (number_p) |
| 331 | { |
| 332 | if (pr != NULL) |
| 333 | { |
| 334 | if (p->property.u.number != number |
| 335 | || p->property.u.number != pr->u.number) |
| 336 | info->callbacks->minfo |
| 337 | (_("Updated property %W (0x%v) to merge %pB (0x%v) " |
| 338 | "and %pB (0x%v)\n"), |
| 339 | (bfd_vma) p->property.pr_type, p->property.u.number, |
| 340 | first_pbfd, number, abfd, pr->u.number); |
| 341 | } |
| 342 | else |
| 343 | { |
| 344 | if (p->property.u.number != number) |
| 345 | info->callbacks->minfo |
| 346 | (_("Updated property %W (%v) to merge %pB (0x%v) " |
| 347 | "and %pB (not found)\n"), |
| 348 | (bfd_vma) p->property.pr_type, p->property.u.number, |
| 349 | first_pbfd, number, abfd); |
| 350 | } |
| 351 | } |
| 352 | lastp = &p->next; |
| 353 | } |
| 354 | |
| 355 | /* Merge the remaining properties on *LISTP with FIRST_PBFD. */ |
| 356 | for (p = *listp; p != NULL; p = p->next) |
| 357 | { |
| 358 | if (p->property.pr_kind == property_number) |
| 359 | { |
| 360 | number_p = TRUE; |
| 361 | number = p->property.u.number; |
| 362 | } |
| 363 | else |
| 364 | number_p = FALSE; |
| 365 | |
| 366 | if (elf_merge_gnu_properties (info, first_pbfd, abfd, NULL, &p->property)) |
| 367 | { |
| 368 | if (p->property.pr_type == GNU_PROPERTY_NO_COPY_ON_PROTECTED) |
| 369 | elf_has_no_copy_on_protected (first_pbfd) = TRUE; |
| 370 | |
| 371 | pr = _bfd_elf_get_property (first_pbfd, p->property.pr_type, |
| 372 | p->property.pr_datasz); |
| 373 | /* It must be a new property. */ |
| 374 | if (pr->pr_kind != property_unknown) |
| 375 | abort (); |
| 376 | /* Add a new property. */ |
| 377 | *pr = p->property; |
| 378 | } |
| 379 | else |
| 380 | { |
| 381 | pr = elf_find_and_remove_property (&elf_properties (first_pbfd), |
| 382 | p->property.pr_type, |
| 383 | FALSE); |
| 384 | if (pr == NULL) |
| 385 | { |
| 386 | if (number_p) |
| 387 | info->callbacks->minfo |
| 388 | (_("Removed property %W to merge %pB (not found) and " |
| 389 | "%pB (0x%v)\n"), |
| 390 | (bfd_vma) p->property.pr_type, first_pbfd, abfd, |
| 391 | number); |
| 392 | else |
| 393 | info->callbacks->minfo |
| 394 | (_("Removed property %W to merge %pB and %pB\n"), |
| 395 | (bfd_vma) p->property.pr_type, first_pbfd, abfd); |
| 396 | } |
| 397 | else if (pr->pr_kind != property_remove) |
| 398 | abort (); |
| 399 | } |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | /* Get GNU property section size. */ |
| 404 | |
| 405 | static bfd_size_type |
| 406 | elf_get_gnu_property_section_size (elf_property_list *list, |
| 407 | unsigned int align_size) |
| 408 | { |
| 409 | bfd_size_type size; |
| 410 | unsigned int descsz; |
| 411 | |
| 412 | /* Compute the output section size. */ |
| 413 | descsz = offsetof (Elf_External_Note, name[sizeof "GNU"]); |
| 414 | descsz = (descsz + 3) & -(unsigned int) 4; |
| 415 | size = descsz; |
| 416 | for (; list != NULL; list = list->next) |
| 417 | { |
| 418 | unsigned int datasz; |
| 419 | /* Check if this property should be skipped. */ |
| 420 | if (list->property.pr_kind == property_remove) |
| 421 | continue; |
| 422 | /* There are 4 byte type + 4 byte datasz for each property. */ |
| 423 | if (list->property.pr_type == GNU_PROPERTY_STACK_SIZE) |
| 424 | datasz = align_size; |
| 425 | else |
| 426 | datasz = list->property.pr_datasz; |
| 427 | size += 4 + 4 + datasz; |
| 428 | /* Align each property. */ |
| 429 | size = (size + (align_size - 1)) & ~(align_size - 1); |
| 430 | } |
| 431 | |
| 432 | return size; |
| 433 | } |
| 434 | |
| 435 | /* Write GNU properties. */ |
| 436 | |
| 437 | static void |
| 438 | elf_write_gnu_properties (bfd *abfd, bfd_byte *contents, |
| 439 | elf_property_list *list, unsigned int size, |
| 440 | unsigned int align_size) |
| 441 | { |
| 442 | unsigned int descsz; |
| 443 | unsigned int datasz; |
| 444 | Elf_External_Note *e_note; |
| 445 | |
| 446 | e_note = (Elf_External_Note *) contents; |
| 447 | descsz = offsetof (Elf_External_Note, name[sizeof "GNU"]); |
| 448 | descsz = (descsz + 3) & -(unsigned int) 4; |
| 449 | bfd_h_put_32 (abfd, sizeof "GNU", &e_note->namesz); |
| 450 | bfd_h_put_32 (abfd, size - descsz, &e_note->descsz); |
| 451 | bfd_h_put_32 (abfd, NT_GNU_PROPERTY_TYPE_0, &e_note->type); |
| 452 | memcpy (e_note->name, "GNU", sizeof "GNU"); |
| 453 | |
| 454 | size = descsz; |
| 455 | for (; list != NULL; list = list->next) |
| 456 | { |
| 457 | /* Check if this property should be skipped. */ |
| 458 | if (list->property.pr_kind == property_remove) |
| 459 | continue; |
| 460 | /* There are 4 byte type + 4 byte datasz for each property. */ |
| 461 | if (list->property.pr_type == GNU_PROPERTY_STACK_SIZE) |
| 462 | datasz = align_size; |
| 463 | else |
| 464 | datasz = list->property.pr_datasz; |
| 465 | bfd_h_put_32 (abfd, list->property.pr_type, contents + size); |
| 466 | bfd_h_put_32 (abfd, datasz, contents + size + 4); |
| 467 | size += 4 + 4; |
| 468 | |
| 469 | /* Write out property value. */ |
| 470 | switch (list->property.pr_kind) |
| 471 | { |
| 472 | case property_number: |
| 473 | switch (datasz) |
| 474 | { |
| 475 | default: |
| 476 | /* Never should happen. */ |
| 477 | abort (); |
| 478 | |
| 479 | case 0: |
| 480 | break; |
| 481 | |
| 482 | case 4: |
| 483 | bfd_h_put_32 (abfd, list->property.u.number, |
| 484 | contents + size); |
| 485 | break; |
| 486 | |
| 487 | case 8: |
| 488 | bfd_h_put_64 (abfd, list->property.u.number, |
| 489 | contents + size); |
| 490 | break; |
| 491 | } |
| 492 | break; |
| 493 | |
| 494 | default: |
| 495 | /* Never should happen. */ |
| 496 | abort (); |
| 497 | } |
| 498 | size += datasz; |
| 499 | |
| 500 | /* Align each property. */ |
| 501 | size = (size + (align_size - 1)) & ~ (align_size - 1); |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | /* Set up GNU properties. Return the first relocatable ELF input with |
| 506 | GNU properties if found. Otherwise, return NULL. */ |
| 507 | |
| 508 | bfd * |
| 509 | _bfd_elf_link_setup_gnu_properties (struct bfd_link_info *info) |
| 510 | { |
| 511 | bfd *abfd, *first_pbfd = NULL; |
| 512 | elf_property_list *list; |
| 513 | asection *sec; |
| 514 | bfd_boolean has_properties = FALSE; |
| 515 | const struct elf_backend_data *bed |
| 516 | = get_elf_backend_data (info->output_bfd); |
| 517 | unsigned int elfclass = bed->s->elfclass; |
| 518 | int elf_machine_code = bed->elf_machine_code; |
| 519 | |
| 520 | /* Find the first relocatable ELF input with GNU properties. */ |
| 521 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 522 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour |
| 523 | && (abfd->flags & DYNAMIC) == 0 |
| 524 | && elf_properties (abfd) != NULL) |
| 525 | { |
| 526 | has_properties = TRUE; |
| 527 | |
| 528 | /* Ignore GNU properties from ELF objects with different machine |
| 529 | code or class. Also skip objects without a GNU_PROPERTY note |
| 530 | section. */ |
| 531 | if ((elf_machine_code |
| 532 | == get_elf_backend_data (abfd)->elf_machine_code) |
| 533 | && (elfclass |
| 534 | == get_elf_backend_data (abfd)->s->elfclass) |
| 535 | && bfd_get_section_by_name (abfd, |
| 536 | NOTE_GNU_PROPERTY_SECTION_NAME) != NULL |
| 537 | ) |
| 538 | { |
| 539 | /* Keep .note.gnu.property section in FIRST_PBFD. */ |
| 540 | first_pbfd = abfd; |
| 541 | break; |
| 542 | } |
| 543 | } |
| 544 | |
| 545 | /* Do nothing if there is no .note.gnu.property section. */ |
| 546 | if (!has_properties) |
| 547 | return NULL; |
| 548 | |
| 549 | /* Merge .note.gnu.property sections. */ |
| 550 | info->callbacks->minfo (_("\n")); |
| 551 | info->callbacks->minfo (_("Merging program properties\n")); |
| 552 | info->callbacks->minfo (_("\n")); |
| 553 | |
| 554 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 555 | if (abfd != first_pbfd |
| 556 | && (abfd->flags & (DYNAMIC | BFD_PLUGIN | BFD_LINKER_CREATED)) == 0) |
| 557 | { |
| 558 | elf_property_list *null_ptr = NULL; |
| 559 | elf_property_list **listp = &null_ptr; |
| 560 | |
| 561 | /* Merge .note.gnu.property section in relocatable ELF input. */ |
| 562 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
| 563 | { |
| 564 | list = elf_properties (abfd); |
| 565 | |
| 566 | /* Ignore GNU properties from ELF objects with different |
| 567 | machine code. */ |
| 568 | if (list != NULL |
| 569 | && (elf_machine_code |
| 570 | == get_elf_backend_data (abfd)->elf_machine_code)) |
| 571 | listp = &elf_properties (abfd); |
| 572 | } |
| 573 | else |
| 574 | list = NULL; |
| 575 | |
| 576 | /* Merge properties with FIRST_PBFD. FIRST_PBFD can be NULL |
| 577 | when all properties are from ELF objects with different |
| 578 | machine code or class. */ |
| 579 | if (first_pbfd != NULL) |
| 580 | elf_merge_gnu_property_list (info, first_pbfd, abfd, listp); |
| 581 | |
| 582 | if (list != NULL) |
| 583 | { |
| 584 | /* Discard the .note.gnu.property section in this bfd. */ |
| 585 | sec = bfd_get_section_by_name (abfd, |
| 586 | NOTE_GNU_PROPERTY_SECTION_NAME); |
| 587 | if (sec != NULL) |
| 588 | sec->output_section = bfd_abs_section_ptr; |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | /* Rewrite .note.gnu.property section so that GNU properties are |
| 593 | always sorted by type even if input GNU properties aren't sorted. */ |
| 594 | if (first_pbfd != NULL) |
| 595 | { |
| 596 | bfd_size_type size; |
| 597 | bfd_byte *contents; |
| 598 | unsigned int align_size = elfclass == ELFCLASS64 ? 8 : 4; |
| 599 | |
| 600 | sec = bfd_get_section_by_name (first_pbfd, |
| 601 | NOTE_GNU_PROPERTY_SECTION_NAME); |
| 602 | BFD_ASSERT (sec != NULL); |
| 603 | |
| 604 | /* Update stack size in .note.gnu.property with -z stack-size=N |
| 605 | if N > 0. */ |
| 606 | if (info->stacksize > 0) |
| 607 | { |
| 608 | elf_property *p; |
| 609 | bfd_vma stacksize = info->stacksize; |
| 610 | |
| 611 | p = _bfd_elf_get_property (first_pbfd, GNU_PROPERTY_STACK_SIZE, |
| 612 | align_size); |
| 613 | if (p->pr_kind == property_unknown) |
| 614 | { |
| 615 | /* Create GNU_PROPERTY_STACK_SIZE. */ |
| 616 | p->u.number = stacksize; |
| 617 | p->pr_kind = property_number; |
| 618 | } |
| 619 | else if (stacksize > p->u.number) |
| 620 | p->u.number = stacksize; |
| 621 | } |
| 622 | else if (elf_properties (first_pbfd) == NULL) |
| 623 | { |
| 624 | /* Discard .note.gnu.property section if all properties have |
| 625 | been removed. */ |
| 626 | sec->output_section = bfd_abs_section_ptr; |
| 627 | return NULL; |
| 628 | } |
| 629 | |
| 630 | /* Fix up GNU properties. */ |
| 631 | if (bed->fixup_gnu_properties) |
| 632 | bed->fixup_gnu_properties (info, &elf_properties (first_pbfd)); |
| 633 | |
| 634 | if (elf_properties (first_pbfd) == NULL) |
| 635 | { |
| 636 | /* Discard .note.gnu.property section if all properties have |
| 637 | been removed. */ |
| 638 | sec->output_section = bfd_abs_section_ptr; |
| 639 | return NULL; |
| 640 | } |
| 641 | |
| 642 | /* Compute the section size. */ |
| 643 | list = elf_properties (first_pbfd); |
| 644 | size = elf_get_gnu_property_section_size (list, align_size); |
| 645 | |
| 646 | /* Update .note.gnu.property section now. */ |
| 647 | sec->size = size; |
| 648 | contents = (bfd_byte *) bfd_zalloc (first_pbfd, size); |
| 649 | |
| 650 | elf_write_gnu_properties (first_pbfd, contents, list, size, |
| 651 | align_size); |
| 652 | |
| 653 | /* Cache the section contents for elf_link_input_bfd. */ |
| 654 | elf_section_data (sec)->this_hdr.contents = contents; |
| 655 | |
| 656 | /* If GNU_PROPERTY_NO_COPY_ON_PROTECTED is set, protected data |
| 657 | symbol is defined in the shared object. */ |
| 658 | if (elf_has_no_copy_on_protected (first_pbfd)) |
| 659 | info->extern_protected_data = FALSE; |
| 660 | } |
| 661 | |
| 662 | return first_pbfd; |
| 663 | } |
| 664 | |
| 665 | /* Convert GNU property size. */ |
| 666 | |
| 667 | bfd_size_type |
| 668 | _bfd_elf_convert_gnu_property_size (bfd *ibfd, bfd *obfd) |
| 669 | { |
| 670 | unsigned int align_size; |
| 671 | const struct elf_backend_data *bed; |
| 672 | elf_property_list *list = elf_properties (ibfd); |
| 673 | |
| 674 | bed = get_elf_backend_data (obfd); |
| 675 | align_size = bed->s->elfclass == ELFCLASS64 ? 8 : 4; |
| 676 | |
| 677 | /* Get the output .note.gnu.property section size. */ |
| 678 | return elf_get_gnu_property_section_size (list, align_size); |
| 679 | } |
| 680 | |
| 681 | /* Convert GNU properties. */ |
| 682 | |
| 683 | bfd_boolean |
| 684 | _bfd_elf_convert_gnu_properties (bfd *ibfd, asection *isec, |
| 685 | bfd *obfd, bfd_byte **ptr, |
| 686 | bfd_size_type *ptr_size) |
| 687 | { |
| 688 | unsigned int size; |
| 689 | bfd_byte *contents; |
| 690 | unsigned int align_shift; |
| 691 | const struct elf_backend_data *bed; |
| 692 | elf_property_list *list = elf_properties (ibfd); |
| 693 | |
| 694 | bed = get_elf_backend_data (obfd); |
| 695 | align_shift = bed->s->elfclass == ELFCLASS64 ? 3 : 2; |
| 696 | |
| 697 | /* Get the output .note.gnu.property section size. */ |
| 698 | size = bfd_section_size (isec->output_section); |
| 699 | |
| 700 | /* Update the output .note.gnu.property section alignment. */ |
| 701 | bfd_set_section_alignment (isec->output_section, align_shift); |
| 702 | |
| 703 | if (size > bfd_section_size (isec)) |
| 704 | { |
| 705 | contents = (bfd_byte *) bfd_malloc (size); |
| 706 | if (contents == NULL) |
| 707 | return FALSE; |
| 708 | free (*ptr); |
| 709 | *ptr = contents; |
| 710 | } |
| 711 | else |
| 712 | contents = *ptr; |
| 713 | |
| 714 | *ptr_size = size; |
| 715 | |
| 716 | /* Generate the output .note.gnu.property section. */ |
| 717 | elf_write_gnu_properties (ibfd, contents, list, size, 1 << align_shift); |
| 718 | |
| 719 | return TRUE; |
| 720 | } |