1 /* BFD back-end for WebAssembly modules. 2 Copyright (C) 2017-2022 Free Software Foundation, Inc. 3 4 Based on srec.c, mmo.c, and binary.c 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 /* The WebAssembly module format is a simple object file format 24 including up to 11 numbered sections, plus any number of named 25 "custom" sections. It is described at: 26 https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md. */ 27 28 #include "sysdep.h" 29 #include "bfd.h" 30 #include "libiberty.h" 31 #include "libbfd.h" 32 #include "wasm-module.h" 33 34 #include <limits.h> 35 #ifndef CHAR_BIT 36 #define CHAR_BIT 8 37 #endif 38 39 typedef struct 40 { 41 asymbol * symbols; 42 bfd_size_type symcount; 43 } tdata_type; 44 45 static const char * const wasm_numbered_sections[] = 46 { 47 NULL, /* Custom section, different layout. */ 48 WASM_SECTION ( 1, "type"), 49 WASM_SECTION ( 2, "import"), 50 WASM_SECTION ( 3, "function"), 51 WASM_SECTION ( 4, "table"), 52 WASM_SECTION ( 5, "memory"), 53 WASM_SECTION ( 6, "global"), 54 WASM_SECTION ( 7, "export"), 55 WASM_SECTION ( 8, "start"), 56 WASM_SECTION ( 9, "element"), 57 WASM_SECTION (10, "code"), 58 WASM_SECTION (11, "data"), 59 }; 60 61 #define WASM_NUMBERED_SECTIONS ARRAY_SIZE (wasm_numbered_sections) 62 63 /* Resolve SECTION_CODE to a section name if there is one, NULL 64 otherwise. */ 65 66 static const char * 67 wasm_section_code_to_name (bfd_byte section_code) 68 { 69 if (section_code < WASM_NUMBERED_SECTIONS) 70 return wasm_numbered_sections[section_code]; 71 72 return NULL; 73 } 74 75 /* Translate section name NAME to a section code, or 0 if it's a 76 custom name. */ 77 78 static unsigned int 79 wasm_section_name_to_code (const char *name) 80 { 81 unsigned i; 82 83 for (i = 1; i < WASM_NUMBERED_SECTIONS; i++) 84 if (strcmp (name, wasm_numbered_sections[i]) == 0) 85 return i; 86 87 return 0; 88 } 89 90 /* WebAssembly LEB128 integers are sufficiently like DWARF LEB128 91 integers that we use _bfd_safe_read_leb128, but there are two 92 points of difference: 93 94 - WebAssembly requires a 32-bit value to be encoded in at most 5 95 bytes, etc. 96 - _bfd_safe_read_leb128 accepts incomplete LEB128 encodings at the 97 end of the buffer, while these are invalid in WebAssembly. 98 99 Those differences mean that we will accept some files that are 100 invalid WebAssembly. */ 101 102 /* Read an LEB128-encoded integer from ABFD's I/O stream, reading one 103 byte at a time. Set ERROR_RETURN if no complete integer could be 104 read, LENGTH_RETURN to the number of bytes read (including bytes in 105 incomplete numbers). SIGN means interpret the number as SLEB128. */ 106 107 static bfd_vma 108 wasm_read_leb128 (bfd *abfd, 109 bool *error_return, 110 unsigned int *length_return, 111 bool sign) 112 { 113 bfd_vma result = 0; 114 unsigned int num_read = 0; 115 unsigned int shift = 0; 116 unsigned char byte = 0; 117 unsigned char lost, mask; 118 int status = 1; 119 120 while (bfd_bread (&byte, 1, abfd) == 1) 121 { 122 num_read++; 123 124 if (shift < CHAR_BIT * sizeof (result)) 125 { 126 result |= ((bfd_vma) (byte & 0x7f)) << shift; 127 /* These bits overflowed. */ 128 lost = byte ^ (result >> shift); 129 /* And this is the mask of possible overflow bits. */ 130 mask = 0x7f ^ ((bfd_vma) 0x7f << shift >> shift); 131 shift += 7; 132 } 133 else 134 { 135 lost = byte; 136 mask = 0x7f; 137 } 138 if ((lost & mask) != (sign && (bfd_signed_vma) result < 0 ? mask : 0)) 139 status |= 2; 140 141 if ((byte & 0x80) == 0) 142 { 143 status &= ~1; 144 if (sign && shift < CHAR_BIT * sizeof (result) && (byte & 0x40)) 145 result |= -((bfd_vma) 1 << shift); 146 break; 147 } 148 } 149 150 if (length_return != NULL) 151 *length_return = num_read; 152 if (error_return != NULL) 153 *error_return = status != 0; 154 155 return result; 156 } 157 158 /* Encode an integer V as LEB128 and write it to ABFD, return TRUE on 159 success. */ 160 161 static bool 162 wasm_write_uleb128 (bfd *abfd, bfd_vma v) 163 { 164 do 165 { 166 bfd_byte c = v & 0x7f; 167 v >>= 7; 168 169 if (v) 170 c |= 0x80; 171 172 if (bfd_bwrite (&c, 1, abfd) != 1) 173 return false; 174 } 175 while (v); 176 177 return true; 178 } 179 180 /* Read the LEB128 integer at P, saving it to X; at end of buffer, 181 jump to error_return. */ 182 #define READ_LEB128(x, p, end) \ 183 do \ 184 { \ 185 if ((p) >= (end)) \ 186 goto error_return; \ 187 (x) = _bfd_safe_read_leb128 (abfd, &(p), false, (end)); \ 188 } \ 189 while (0) 190 191 /* Verify the magic number at the beginning of a WebAssembly module 192 ABFD, setting ERRORPTR if there's a mismatch. */ 193 194 static bool 195 wasm_read_magic (bfd *abfd, bool *errorptr) 196 { 197 bfd_byte magic_const[SIZEOF_WASM_MAGIC] = WASM_MAGIC; 198 bfd_byte magic[SIZEOF_WASM_MAGIC]; 199 200 if (bfd_bread (magic, sizeof (magic), abfd) == sizeof (magic) 201 && memcmp (magic, magic_const, sizeof (magic)) == 0) 202 return true; 203 204 *errorptr = true; 205 return false; 206 } 207 208 /* Read the version number from ABFD, returning TRUE if it's a supported 209 version. Set ERRORPTR otherwise. */ 210 211 static bool 212 wasm_read_version (bfd *abfd, bool *errorptr) 213 { 214 bfd_byte vers_const[SIZEOF_WASM_VERSION] = WASM_VERSION; 215 bfd_byte vers[SIZEOF_WASM_VERSION]; 216 217 if (bfd_bread (vers, sizeof (vers), abfd) == sizeof (vers) 218 /* Don't attempt to parse newer versions, which are likely to 219 require code changes. */ 220 && memcmp (vers, vers_const, sizeof (vers)) == 0) 221 return true; 222 223 *errorptr = true; 224 return false; 225 } 226 227 /* Read the WebAssembly header (magic number plus version number) from 228 ABFD, setting ERRORPTR to TRUE if there is a mismatch. */ 229 230 static bool 231 wasm_read_header (bfd *abfd, bool *errorptr) 232 { 233 if (! wasm_read_magic (abfd, errorptr)) 234 return false; 235 236 if (! wasm_read_version (abfd, errorptr)) 237 return false; 238 239 return true; 240 } 241 242 /* Scan the "function" subsection of the "name" section ASECT in the 243 wasm module ABFD. Create symbols. Return TRUE on success. */ 244 245 static bool 246 wasm_scan_name_function_section (bfd *abfd, sec_ptr asect) 247 { 248 bfd_byte *p; 249 bfd_byte *end; 250 bfd_vma payload_size; 251 bfd_vma symcount = 0; 252 tdata_type *tdata = abfd->tdata.any; 253 asymbol *symbols = NULL; 254 sec_ptr space_function_index; 255 size_t amt; 256 257 p = asect->contents; 258 end = asect->contents + asect->size; 259 260 if (!p) 261 return false; 262 263 while (p < end) 264 { 265 bfd_byte subsection_code = *p++; 266 if (subsection_code == WASM_FUNCTION_SUBSECTION) 267 break; 268 269 /* subsection_code is documented to be a varuint7, meaning that 270 it has to be a single byte in the 0 - 127 range. If it isn't, 271 the spec must have changed underneath us, so give up. */ 272 if (subsection_code & 0x80) 273 return false; 274 275 READ_LEB128 (payload_size, p, end); 276 277 if (payload_size > (size_t) (end - p)) 278 return false; 279 280 p += payload_size; 281 } 282 283 if (p >= end) 284 return false; 285 286 READ_LEB128 (payload_size, p, end); 287 288 if (payload_size > (size_t) (end - p)) 289 return false; 290 291 end = p + payload_size; 292 293 READ_LEB128 (symcount, p, end); 294 295 /* Sanity check: each symbol has at least two bytes. */ 296 if (symcount > payload_size / 2) 297 return false; 298 299 tdata->symcount = symcount; 300 301 space_function_index 302 = bfd_make_section_with_flags (abfd, WASM_SECTION_FUNCTION_INDEX, 303 SEC_READONLY | SEC_CODE); 304 305 if (!space_function_index) 306 space_function_index 307 = bfd_get_section_by_name (abfd, WASM_SECTION_FUNCTION_INDEX); 308 309 if (!space_function_index) 310 return false; 311 312 if (_bfd_mul_overflow (tdata->symcount, sizeof (asymbol), &amt)) 313 { 314 bfd_set_error (bfd_error_file_too_big); 315 return false; 316 } 317 symbols = bfd_alloc (abfd, amt); 318 if (!symbols) 319 return false; 320 321 for (symcount = 0; p < end && symcount < tdata->symcount; symcount++) 322 { 323 bfd_vma idx; 324 bfd_vma len; 325 char *name; 326 asymbol *sym; 327 328 READ_LEB128 (idx, p, end); 329 READ_LEB128 (len, p, end); 330 331 if (len > (size_t) (end - p)) 332 goto error_return; 333 334 name = bfd_alloc (abfd, len + 1); 335 if (!name) 336 goto error_return; 337 338 memcpy (name, p, len); 339 name[len] = 0; 340 p += len; 341 342 sym = &symbols[symcount]; 343 sym->the_bfd = abfd; 344 sym->name = name; 345 sym->value = idx; 346 sym->flags = BSF_GLOBAL | BSF_FUNCTION; 347 sym->section = space_function_index; 348 sym->udata.p = NULL; 349 } 350 351 if (symcount < tdata->symcount) 352 goto error_return; 353 354 tdata->symbols = symbols; 355 abfd->symcount = symcount; 356 357 return true; 358 359 error_return: 360 if (symbols) 361 bfd_release (abfd, symbols); 362 return false; 363 } 364 365 /* Read a byte from ABFD and return it, or EOF for EOF or error. 366 Set ERRORPTR on non-EOF error. */ 367 368 static int 369 wasm_read_byte (bfd *abfd, bool *errorptr) 370 { 371 bfd_byte byte; 372 373 if (bfd_bread (&byte, (bfd_size_type) 1, abfd) != 1) 374 { 375 if (bfd_get_error () != bfd_error_file_truncated) 376 *errorptr = true; 377 return EOF; 378 } 379 380 return byte; 381 } 382 383 /* Scan the wasm module ABFD, creating sections and symbols. 384 Return TRUE on success. */ 385 386 static bool 387 wasm_scan (bfd *abfd) 388 { 389 bool error = false; 390 /* Fake VMAs for now. Choose 0x80000000 as base to avoid clashes 391 with actual data addresses. */ 392 bfd_vma vma = 0x80000000; 393 int section_code; 394 unsigned int bytes_read; 395 asection *bfdsec; 396 397 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0) 398 goto error_return; 399 400 if (!wasm_read_header (abfd, &error)) 401 goto error_return; 402 403 while ((section_code = wasm_read_byte (abfd, &error)) != EOF) 404 { 405 if (section_code != 0) 406 { 407 const char *sname = wasm_section_code_to_name (section_code); 408 409 if (!sname) 410 goto error_return; 411 412 bfdsec = bfd_make_section_anyway_with_flags (abfd, sname, 413 SEC_HAS_CONTENTS); 414 if (bfdsec == NULL) 415 goto error_return; 416 417 bfdsec->size = wasm_read_leb128 (abfd, &error, &bytes_read, false); 418 if (error) 419 goto error_return; 420 } 421 else 422 { 423 bfd_vma payload_len; 424 bfd_vma namelen; 425 char *name; 426 char *prefix = WASM_SECTION_PREFIX; 427 size_t prefixlen = strlen (prefix); 428 ufile_ptr filesize; 429 430 payload_len = wasm_read_leb128 (abfd, &error, &bytes_read, false); 431 if (error) 432 goto error_return; 433 namelen = wasm_read_leb128 (abfd, &error, &bytes_read, false); 434 if (error || bytes_read > payload_len 435 || namelen > payload_len - bytes_read) 436 goto error_return; 437 payload_len -= namelen + bytes_read; 438 filesize = bfd_get_file_size (abfd); 439 if (filesize != 0 && namelen > filesize) 440 { 441 bfd_set_error (bfd_error_file_truncated); 442 return false; 443 } 444 name = bfd_alloc (abfd, namelen + prefixlen + 1); 445 if (!name) 446 goto error_return; 447 memcpy (name, prefix, prefixlen); 448 if (bfd_bread (name + prefixlen, namelen, abfd) != namelen) 449 goto error_return; 450 name[prefixlen + namelen] = 0; 451 452 bfdsec = bfd_make_section_anyway_with_flags (abfd, name, 453 SEC_HAS_CONTENTS); 454 if (bfdsec == NULL) 455 goto error_return; 456 457 bfdsec->size = payload_len; 458 } 459 460 bfdsec->vma = vma; 461 bfdsec->lma = vma; 462 bfdsec->alignment_power = 0; 463 bfdsec->filepos = bfd_tell (abfd); 464 if (bfdsec->size != 0) 465 { 466 bfdsec->contents = _bfd_alloc_and_read (abfd, bfdsec->size, 467 bfdsec->size); 468 if (!bfdsec->contents) 469 goto error_return; 470 } 471 472 vma += bfdsec->size; 473 } 474 475 /* Make sure we're at actual EOF. There's no indication in the 476 WebAssembly format of how long the file is supposed to be. */ 477 if (error) 478 goto error_return; 479 480 return true; 481 482 error_return: 483 return false; 484 } 485 486 /* Put a numbered section ASECT of ABFD into the table of numbered 487 sections pointed to by FSARG. */ 488 489 static void 490 wasm_register_section (bfd *abfd ATTRIBUTE_UNUSED, 491 asection *asect, 492 void *fsarg) 493 { 494 sec_ptr *numbered_sections = fsarg; 495 int idx = wasm_section_name_to_code (asect->name); 496 497 if (idx == 0) 498 return; 499 500 numbered_sections[idx] = asect; 501 } 502 503 struct compute_section_arg 504 { 505 bfd_vma pos; 506 bool failed; 507 }; 508 509 /* Compute the file position of ABFD's section ASECT. FSARG is a 510 pointer to the current file position. 511 512 We allow section names of the form .wasm.id to encode the numbered 513 section with ID id, if it exists; otherwise, a custom section with 514 ID "id" is produced. Arbitrary section names are for sections that 515 are assumed already to contain a section header; those are appended 516 to the WebAssembly module verbatim. */ 517 518 static void 519 wasm_compute_custom_section_file_position (bfd *abfd, 520 sec_ptr asect, 521 void *fsarg) 522 { 523 struct compute_section_arg *fs = fsarg; 524 int idx; 525 526 if (fs->failed) 527 return; 528 529 idx = wasm_section_name_to_code (asect->name); 530 531 if (idx != 0) 532 return; 533 534 if (startswith (asect->name, WASM_SECTION_PREFIX)) 535 { 536 const char *name = asect->name + strlen (WASM_SECTION_PREFIX); 537 bfd_size_type payload_len = asect->size; 538 bfd_size_type name_len = strlen (name); 539 bfd_size_type nl = name_len; 540 541 payload_len += name_len; 542 543 do 544 { 545 payload_len++; 546 nl >>= 7; 547 } 548 while (nl); 549 550 bfd_seek (abfd, fs->pos, SEEK_SET); 551 if (! wasm_write_uleb128 (abfd, 0) 552 || ! wasm_write_uleb128 (abfd, payload_len) 553 || ! wasm_write_uleb128 (abfd, name_len) 554 || bfd_bwrite (name, name_len, abfd) != name_len) 555 goto error_return; 556 fs->pos = asect->filepos = bfd_tell (abfd); 557 } 558 else 559 { 560 asect->filepos = fs->pos; 561 } 562 563 564 fs->pos += asect->size; 565 return; 566 567 error_return: 568 fs->failed = true; 569 } 570 571 /* Compute the file positions for the sections of ABFD. Currently, 572 this writes all numbered sections first, in order, then all custom 573 sections, in section order. 574 575 The spec says that the numbered sections must appear in order of 576 their ids, but custom sections can appear in any position and any 577 order, and more than once. FIXME: support that. */ 578 579 static bool 580 wasm_compute_section_file_positions (bfd *abfd) 581 { 582 bfd_byte magic[SIZEOF_WASM_MAGIC] = WASM_MAGIC; 583 bfd_byte vers[SIZEOF_WASM_VERSION] = WASM_VERSION; 584 sec_ptr numbered_sections[WASM_NUMBERED_SECTIONS]; 585 struct compute_section_arg fs; 586 unsigned int i; 587 588 bfd_seek (abfd, (bfd_vma) 0, SEEK_SET); 589 590 if (bfd_bwrite (magic, sizeof (magic), abfd) != (sizeof magic) 591 || bfd_bwrite (vers, sizeof (vers), abfd) != sizeof (vers)) 592 return false; 593 594 for (i = 0; i < WASM_NUMBERED_SECTIONS; i++) 595 numbered_sections[i] = NULL; 596 597 bfd_map_over_sections (abfd, wasm_register_section, numbered_sections); 598 599 fs.pos = bfd_tell (abfd); 600 for (i = 0; i < WASM_NUMBERED_SECTIONS; i++) 601 { 602 sec_ptr sec = numbered_sections[i]; 603 bfd_size_type size; 604 605 if (! sec) 606 continue; 607 size = sec->size; 608 if (bfd_seek (abfd, fs.pos, SEEK_SET) != 0) 609 return false; 610 if (! wasm_write_uleb128 (abfd, i) 611 || ! wasm_write_uleb128 (abfd, size)) 612 return false; 613 fs.pos = sec->filepos = bfd_tell (abfd); 614 fs.pos += size; 615 } 616 617 fs.failed = false; 618 619 bfd_map_over_sections (abfd, wasm_compute_custom_section_file_position, &fs); 620 621 if (fs.failed) 622 return false; 623 624 abfd->output_has_begun = true; 625 626 return true; 627 } 628 629 static bool 630 wasm_set_section_contents (bfd *abfd, 631 sec_ptr section, 632 const void *location, 633 file_ptr offset, 634 bfd_size_type count) 635 { 636 if (count == 0) 637 return true; 638 639 if (! abfd->output_has_begun 640 && ! wasm_compute_section_file_positions (abfd)) 641 return false; 642 643 if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0 644 || bfd_bwrite (location, count, abfd) != count) 645 return false; 646 647 return true; 648 } 649 650 static bool 651 wasm_write_object_contents (bfd* abfd) 652 { 653 bfd_byte magic[] = WASM_MAGIC; 654 bfd_byte vers[] = WASM_VERSION; 655 656 if (bfd_seek (abfd, 0, SEEK_SET) != 0) 657 return false; 658 659 if (bfd_bwrite (magic, sizeof (magic), abfd) != sizeof (magic) 660 || bfd_bwrite (vers, sizeof (vers), abfd) != sizeof (vers)) 661 return false; 662 663 return true; 664 } 665 666 static bool 667 wasm_mkobject (bfd *abfd) 668 { 669 tdata_type *tdata = (tdata_type *) bfd_alloc (abfd, sizeof (tdata_type)); 670 671 if (! tdata) 672 return false; 673 674 tdata->symbols = NULL; 675 tdata->symcount = 0; 676 677 abfd->tdata.any = tdata; 678 679 return true; 680 } 681 682 static long 683 wasm_get_symtab_upper_bound (bfd *abfd) 684 { 685 tdata_type *tdata = abfd->tdata.any; 686 687 return (tdata->symcount + 1) * (sizeof (asymbol *)); 688 } 689 690 static long 691 wasm_canonicalize_symtab (bfd *abfd, asymbol **alocation) 692 { 693 tdata_type *tdata = abfd->tdata.any; 694 size_t i; 695 696 for (i = 0; i < tdata->symcount; i++) 697 alocation[i] = &tdata->symbols[i]; 698 alocation[i] = NULL; 699 700 return tdata->symcount; 701 } 702 703 static asymbol * 704 wasm_make_empty_symbol (bfd *abfd) 705 { 706 size_t amt = sizeof (asymbol); 707 asymbol *new_symbol = (asymbol *) bfd_zalloc (abfd, amt); 708 709 if (! new_symbol) 710 return NULL; 711 new_symbol->the_bfd = abfd; 712 return new_symbol; 713 } 714 715 static void 716 wasm_print_symbol (bfd *abfd, 717 void * filep, 718 asymbol *symbol, 719 bfd_print_symbol_type how) 720 { 721 FILE *file = (FILE *) filep; 722 723 switch (how) 724 { 725 case bfd_print_symbol_name: 726 fprintf (file, "%s", symbol->name); 727 break; 728 729 default: 730 bfd_print_symbol_vandf (abfd, filep, symbol); 731 fprintf (file, " %-5s %s", symbol->section->name, symbol->name); 732 } 733 } 734 735 static void 736 wasm_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED, 737 asymbol *symbol, 738 symbol_info *ret) 739 { 740 bfd_symbol_info (symbol, ret); 741 } 742 743 /* Check whether ABFD is a WebAssembly module; if so, scan it. */ 744 745 static bfd_cleanup 746 wasm_object_p (bfd *abfd) 747 { 748 bool error; 749 asection *s; 750 751 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0) 752 return NULL; 753 754 if (!wasm_read_header (abfd, &error)) 755 { 756 bfd_set_error (bfd_error_wrong_format); 757 return NULL; 758 } 759 760 if (!wasm_mkobject (abfd)) 761 return NULL; 762 763 if (!wasm_scan (abfd) 764 || !bfd_default_set_arch_mach (abfd, bfd_arch_wasm32, 0)) 765 { 766 bfd_release (abfd, abfd->tdata.any); 767 abfd->tdata.any = NULL; 768 return NULL; 769 } 770 771 s = bfd_get_section_by_name (abfd, WASM_NAME_SECTION); 772 if (s != NULL && wasm_scan_name_function_section (abfd, s)) 773 abfd->flags |= HAS_SYMS; 774 775 return _bfd_no_cleanup; 776 } 777 778 /* BFD_JUMP_TABLE_WRITE */ 779 #define wasm_set_arch_mach _bfd_generic_set_arch_mach 780 781 /* BFD_JUMP_TABLE_SYMBOLS */ 782 #define wasm_get_symbol_version_string _bfd_nosymbols_get_symbol_version_string 783 #define wasm_bfd_is_local_label_name bfd_generic_is_local_label_name 784 #define wasm_bfd_is_target_special_symbol _bfd_bool_bfd_asymbol_false 785 #define wasm_get_lineno _bfd_nosymbols_get_lineno 786 #define wasm_find_nearest_line _bfd_nosymbols_find_nearest_line 787 #define wasm_find_line _bfd_nosymbols_find_line 788 #define wasm_find_inliner_info _bfd_nosymbols_find_inliner_info 789 #define wasm_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol 790 #define wasm_read_minisymbols _bfd_generic_read_minisymbols 791 #define wasm_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 792 793 const bfd_target wasm_vec = 794 { 795 "wasm", /* Name. */ 796 bfd_target_unknown_flavour, 797 BFD_ENDIAN_LITTLE, 798 BFD_ENDIAN_LITTLE, 799 (HAS_SYMS | WP_TEXT), /* Object flags. */ 800 (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS), /* Section flags. */ 801 0, /* Leading underscore. */ 802 ' ', /* AR_pad_char. */ 803 255, /* AR_max_namelen. */ 804 0, /* Match priority. */ 805 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */ 806 /* Routines to byte-swap various sized integers from the data sections. */ 807 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 808 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 809 bfd_getl16, bfd_getl_signed_16, bfd_putl16, 810 811 /* Routines to byte-swap various sized integers from the file headers. */ 812 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 813 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 814 bfd_getl16, bfd_getl_signed_16, bfd_putl16, 815 816 { 817 _bfd_dummy_target, 818 wasm_object_p, /* bfd_check_format. */ 819 _bfd_dummy_target, 820 _bfd_dummy_target, 821 }, 822 { 823 _bfd_bool_bfd_false_error, 824 wasm_mkobject, 825 _bfd_generic_mkarchive, 826 _bfd_bool_bfd_false_error, 827 }, 828 { /* bfd_write_contents. */ 829 _bfd_bool_bfd_false_error, 830 wasm_write_object_contents, 831 _bfd_write_archive_contents, 832 _bfd_bool_bfd_false_error, 833 }, 834 835 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 836 BFD_JUMP_TABLE_COPY (_bfd_generic), 837 BFD_JUMP_TABLE_CORE (_bfd_nocore), 838 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 839 BFD_JUMP_TABLE_SYMBOLS (wasm), 840 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 841 BFD_JUMP_TABLE_WRITE (wasm), 842 BFD_JUMP_TABLE_LINK (_bfd_nolink), 843 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 844 845 NULL, 846 847 NULL, 848 }; 849