1 /* Postprocess module symbol versions 2 * 3 * Copyright 2003 Kai Germaschewski 4 * Copyright 2002-2004 Rusty Russell, IBM Corporation 5 * Copyright 2006 Sam Ravnborg 6 * Based in part on module-init-tools/depmod.c,file2alias 7 * 8 * This software may be used and distributed according to the terms 9 * of the GNU General Public License, incorporated herein by reference. 10 * 11 * Usage: modpost vmlinux module1.o module2.o ... 12 */ 13 14 #include <ctype.h> 15 #include "modpost.h" 16 #include "../../include/linux/license.h" 17 18 /* Are we using CONFIG_MODVERSIONS? */ 19 int modversions = 0; 20 /* Warn about undefined symbols? (do so if we have vmlinux) */ 21 int have_vmlinux = 0; 22 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ 23 static int all_versions = 0; 24 /* If we are modposting external module set to 1 */ 25 static int external_module = 0; 26 /* Only warn about unresolved symbols */ 27 static int warn_unresolved = 0; 28 /* How a symbol is exported */ 29 enum export { 30 export_plain, export_unused, export_gpl, 31 export_unused_gpl, export_gpl_future, export_unknown 32 }; 33 34 void fatal(const char *fmt, ...) 35 { 36 va_list arglist; 37 38 fprintf(stderr, "FATAL: "); 39 40 va_start(arglist, fmt); 41 vfprintf(stderr, fmt, arglist); 42 va_end(arglist); 43 44 exit(1); 45 } 46 47 void warn(const char *fmt, ...) 48 { 49 va_list arglist; 50 51 fprintf(stderr, "WARNING: "); 52 53 va_start(arglist, fmt); 54 vfprintf(stderr, fmt, arglist); 55 va_end(arglist); 56 } 57 58 static int is_vmlinux(const char *modname) 59 { 60 const char *myname; 61 62 if ((myname = strrchr(modname, '/'))) 63 myname++; 64 else 65 myname = modname; 66 67 return strcmp(myname, "vmlinux") == 0; 68 } 69 70 void *do_nofail(void *ptr, const char *expr) 71 { 72 if (!ptr) { 73 fatal("modpost: Memory allocation failure: %s.\n", expr); 74 } 75 return ptr; 76 } 77 78 /* A list of all modules we processed */ 79 80 static struct module *modules; 81 82 static struct module *find_module(char *modname) 83 { 84 struct module *mod; 85 86 for (mod = modules; mod; mod = mod->next) 87 if (strcmp(mod->name, modname) == 0) 88 break; 89 return mod; 90 } 91 92 static struct module *new_module(char *modname) 93 { 94 struct module *mod; 95 char *p, *s; 96 97 mod = NOFAIL(malloc(sizeof(*mod))); 98 memset(mod, 0, sizeof(*mod)); 99 p = NOFAIL(strdup(modname)); 100 101 /* strip trailing .o */ 102 if ((s = strrchr(p, '.')) != NULL) 103 if (strcmp(s, ".o") == 0) 104 *s = '\0'; 105 106 /* add to list */ 107 mod->name = p; 108 mod->gpl_compatible = -1; 109 mod->next = modules; 110 modules = mod; 111 112 return mod; 113 } 114 115 /* A hash of all exported symbols, 116 * struct symbol is also used for lists of unresolved symbols */ 117 118 #define SYMBOL_HASH_SIZE 1024 119 120 struct symbol { 121 struct symbol *next; 122 struct module *module; 123 unsigned int crc; 124 int crc_valid; 125 unsigned int weak:1; 126 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ 127 unsigned int kernel:1; /* 1 if symbol is from kernel 128 * (only for external modules) **/ 129 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ 130 enum export export; /* Type of export */ 131 char name[0]; 132 }; 133 134 static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; 135 136 /* This is based on the hash agorithm from gdbm, via tdb */ 137 static inline unsigned int tdb_hash(const char *name) 138 { 139 unsigned value; /* Used to compute the hash value. */ 140 unsigned i; /* Used to cycle through random values. */ 141 142 /* Set the initial value from the key size. */ 143 for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) 144 value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); 145 146 return (1103515243 * value + 12345); 147 } 148 149 /** 150 * Allocate a new symbols for use in the hash of exported symbols or 151 * the list of unresolved symbols per module 152 **/ 153 static struct symbol *alloc_symbol(const char *name, unsigned int weak, 154 struct symbol *next) 155 { 156 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); 157 158 memset(s, 0, sizeof(*s)); 159 strcpy(s->name, name); 160 s->weak = weak; 161 s->next = next; 162 return s; 163 } 164 165 /* For the hash of exported symbols */ 166 static struct symbol *new_symbol(const char *name, struct module *module, 167 enum export export) 168 { 169 unsigned int hash; 170 struct symbol *new; 171 172 hash = tdb_hash(name) % SYMBOL_HASH_SIZE; 173 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); 174 new->module = module; 175 new->export = export; 176 return new; 177 } 178 179 static struct symbol *find_symbol(const char *name) 180 { 181 struct symbol *s; 182 183 /* For our purposes, .foo matches foo. PPC64 needs this. */ 184 if (name[0] == '.') 185 name++; 186 187 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { 188 if (strcmp(s->name, name) == 0) 189 return s; 190 } 191 return NULL; 192 } 193 194 static struct { 195 const char *str; 196 enum export export; 197 } export_list[] = { 198 { .str = "EXPORT_SYMBOL", .export = export_plain }, 199 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, 200 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, 201 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, 202 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, 203 { .str = "(unknown)", .export = export_unknown }, 204 }; 205 206 207 static const char *export_str(enum export ex) 208 { 209 return export_list[ex].str; 210 } 211 212 static enum export export_no(const char * s) 213 { 214 int i; 215 if (!s) 216 return export_unknown; 217 for (i = 0; export_list[i].export != export_unknown; i++) { 218 if (strcmp(export_list[i].str, s) == 0) 219 return export_list[i].export; 220 } 221 return export_unknown; 222 } 223 224 static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) 225 { 226 if (sec == elf->export_sec) 227 return export_plain; 228 else if (sec == elf->export_unused_sec) 229 return export_unused; 230 else if (sec == elf->export_gpl_sec) 231 return export_gpl; 232 else if (sec == elf->export_unused_gpl_sec) 233 return export_unused_gpl; 234 else if (sec == elf->export_gpl_future_sec) 235 return export_gpl_future; 236 else 237 return export_unknown; 238 } 239 240 /** 241 * Add an exported symbol - it may have already been added without a 242 * CRC, in this case just update the CRC 243 **/ 244 static struct symbol *sym_add_exported(const char *name, struct module *mod, 245 enum export export) 246 { 247 struct symbol *s = find_symbol(name); 248 249 if (!s) { 250 s = new_symbol(name, mod, export); 251 } else { 252 if (!s->preloaded) { 253 warn("%s: '%s' exported twice. Previous export " 254 "was in %s%s\n", mod->name, name, 255 s->module->name, 256 is_vmlinux(s->module->name) ?"":".ko"); 257 } 258 } 259 s->preloaded = 0; 260 s->vmlinux = is_vmlinux(mod->name); 261 s->kernel = 0; 262 s->export = export; 263 return s; 264 } 265 266 static void sym_update_crc(const char *name, struct module *mod, 267 unsigned int crc, enum export export) 268 { 269 struct symbol *s = find_symbol(name); 270 271 if (!s) 272 s = new_symbol(name, mod, export); 273 s->crc = crc; 274 s->crc_valid = 1; 275 } 276 277 void *grab_file(const char *filename, unsigned long *size) 278 { 279 struct stat st; 280 void *map; 281 int fd; 282 283 fd = open(filename, O_RDONLY); 284 if (fd < 0 || fstat(fd, &st) != 0) 285 return NULL; 286 287 *size = st.st_size; 288 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); 289 close(fd); 290 291 if (map == MAP_FAILED) 292 return NULL; 293 return map; 294 } 295 296 /** 297 * Return a copy of the next line in a mmap'ed file. 298 * spaces in the beginning of the line is trimmed away. 299 * Return a pointer to a static buffer. 300 **/ 301 char* get_next_line(unsigned long *pos, void *file, unsigned long size) 302 { 303 static char line[4096]; 304 int skip = 1; 305 size_t len = 0; 306 signed char *p = (signed char *)file + *pos; 307 char *s = line; 308 309 for (; *pos < size ; (*pos)++) 310 { 311 if (skip && isspace(*p)) { 312 p++; 313 continue; 314 } 315 skip = 0; 316 if (*p != '\n' && (*pos < size)) { 317 len++; 318 *s++ = *p++; 319 if (len > 4095) 320 break; /* Too long, stop */ 321 } else { 322 /* End of string */ 323 *s = '\0'; 324 return line; 325 } 326 } 327 /* End of buffer */ 328 return NULL; 329 } 330 331 void release_file(void *file, unsigned long size) 332 { 333 munmap(file, size); 334 } 335 336 static void parse_elf(struct elf_info *info, const char *filename) 337 { 338 unsigned int i; 339 Elf_Ehdr *hdr = info->hdr; 340 Elf_Shdr *sechdrs; 341 Elf_Sym *sym; 342 343 hdr = grab_file(filename, &info->size); 344 if (!hdr) { 345 perror(filename); 346 exit(1); 347 } 348 info->hdr = hdr; 349 if (info->size < sizeof(*hdr)) 350 goto truncated; 351 352 /* Fix endianness in ELF header */ 353 hdr->e_shoff = TO_NATIVE(hdr->e_shoff); 354 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); 355 hdr->e_shnum = TO_NATIVE(hdr->e_shnum); 356 hdr->e_machine = TO_NATIVE(hdr->e_machine); 357 sechdrs = (void *)hdr + hdr->e_shoff; 358 info->sechdrs = sechdrs; 359 360 /* Fix endianness in section headers */ 361 for (i = 0; i < hdr->e_shnum; i++) { 362 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); 363 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); 364 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); 365 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); 366 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); 367 } 368 /* Find symbol table. */ 369 for (i = 1; i < hdr->e_shnum; i++) { 370 const char *secstrings 371 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 372 const char *secname; 373 374 if (sechdrs[i].sh_offset > info->size) 375 goto truncated; 376 secname = secstrings + sechdrs[i].sh_name; 377 if (strcmp(secname, ".modinfo") == 0) { 378 info->modinfo = (void *)hdr + sechdrs[i].sh_offset; 379 info->modinfo_len = sechdrs[i].sh_size; 380 } else if (strcmp(secname, "__ksymtab") == 0) 381 info->export_sec = i; 382 else if (strcmp(secname, "__ksymtab_unused") == 0) 383 info->export_unused_sec = i; 384 else if (strcmp(secname, "__ksymtab_gpl") == 0) 385 info->export_gpl_sec = i; 386 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) 387 info->export_unused_gpl_sec = i; 388 else if (strcmp(secname, "__ksymtab_gpl_future") == 0) 389 info->export_gpl_future_sec = i; 390 391 if (sechdrs[i].sh_type != SHT_SYMTAB) 392 continue; 393 394 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; 395 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset 396 + sechdrs[i].sh_size; 397 info->strtab = (void *)hdr + 398 sechdrs[sechdrs[i].sh_link].sh_offset; 399 } 400 if (!info->symtab_start) { 401 fatal("%s has no symtab?\n", filename); 402 } 403 /* Fix endianness in symbols */ 404 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { 405 sym->st_shndx = TO_NATIVE(sym->st_shndx); 406 sym->st_name = TO_NATIVE(sym->st_name); 407 sym->st_value = TO_NATIVE(sym->st_value); 408 sym->st_size = TO_NATIVE(sym->st_size); 409 } 410 return; 411 412 truncated: 413 fatal("%s is truncated.\n", filename); 414 } 415 416 static void parse_elf_finish(struct elf_info *info) 417 { 418 release_file(info->hdr, info->size); 419 } 420 421 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" 422 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" 423 424 static void handle_modversions(struct module *mod, struct elf_info *info, 425 Elf_Sym *sym, const char *symname) 426 { 427 unsigned int crc; 428 enum export export = export_from_sec(info, sym->st_shndx); 429 430 switch (sym->st_shndx) { 431 case SHN_COMMON: 432 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); 433 break; 434 case SHN_ABS: 435 /* CRC'd symbol */ 436 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { 437 crc = (unsigned int) sym->st_value; 438 sym_update_crc(symname + strlen(CRC_PFX), mod, crc, 439 export); 440 } 441 break; 442 case SHN_UNDEF: 443 /* undefined symbol */ 444 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && 445 ELF_ST_BIND(sym->st_info) != STB_WEAK) 446 break; 447 /* ignore global offset table */ 448 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) 449 break; 450 /* ignore __this_module, it will be resolved shortly */ 451 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) 452 break; 453 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ 454 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) 455 /* add compatibility with older glibc */ 456 #ifndef STT_SPARC_REGISTER 457 #define STT_SPARC_REGISTER STT_REGISTER 458 #endif 459 if (info->hdr->e_machine == EM_SPARC || 460 info->hdr->e_machine == EM_SPARCV9) { 461 /* Ignore register directives. */ 462 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) 463 break; 464 if (symname[0] == '.') { 465 char *munged = strdup(symname); 466 munged[0] = '_'; 467 munged[1] = toupper(munged[1]); 468 symname = munged; 469 } 470 } 471 #endif 472 473 if (memcmp(symname, MODULE_SYMBOL_PREFIX, 474 strlen(MODULE_SYMBOL_PREFIX)) == 0) 475 mod->unres = alloc_symbol(symname + 476 strlen(MODULE_SYMBOL_PREFIX), 477 ELF_ST_BIND(sym->st_info) == STB_WEAK, 478 mod->unres); 479 break; 480 default: 481 /* All exported symbols */ 482 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { 483 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, 484 export); 485 } 486 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) 487 mod->has_init = 1; 488 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) 489 mod->has_cleanup = 1; 490 break; 491 } 492 } 493 494 /** 495 * Parse tag=value strings from .modinfo section 496 **/ 497 static char *next_string(char *string, unsigned long *secsize) 498 { 499 /* Skip non-zero chars */ 500 while (string[0]) { 501 string++; 502 if ((*secsize)-- <= 1) 503 return NULL; 504 } 505 506 /* Skip any zero padding. */ 507 while (!string[0]) { 508 string++; 509 if ((*secsize)-- <= 1) 510 return NULL; 511 } 512 return string; 513 } 514 515 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, 516 const char *tag, char *info) 517 { 518 char *p; 519 unsigned int taglen = strlen(tag); 520 unsigned long size = modinfo_len; 521 522 if (info) { 523 size -= info - (char *)modinfo; 524 modinfo = next_string(info, &size); 525 } 526 527 for (p = modinfo; p; p = next_string(p, &size)) { 528 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') 529 return p + taglen + 1; 530 } 531 return NULL; 532 } 533 534 static char *get_modinfo(void *modinfo, unsigned long modinfo_len, 535 const char *tag) 536 537 { 538 return get_next_modinfo(modinfo, modinfo_len, tag, NULL); 539 } 540 541 /** 542 * Test if string s ends in string sub 543 * return 0 if match 544 **/ 545 static int strrcmp(const char *s, const char *sub) 546 { 547 int slen, sublen; 548 549 if (!s || !sub) 550 return 1; 551 552 slen = strlen(s); 553 sublen = strlen(sub); 554 555 if ((slen == 0) || (sublen == 0)) 556 return 1; 557 558 if (sublen > slen) 559 return 1; 560 561 return memcmp(s + slen - sublen, sub, sublen); 562 } 563 564 /** 565 * Whitelist to allow certain references to pass with no warning. 566 * Pattern 1: 567 * If a module parameter is declared __initdata and permissions=0 568 * then this is legal despite the warning generated. 569 * We cannot see value of permissions here, so just ignore 570 * this pattern. 571 * The pattern is identified by: 572 * tosec = .init.data 573 * fromsec = .data* 574 * atsym =__param* 575 * 576 * Pattern 2: 577 * Many drivers utilise a *driver container with references to 578 * add, remove, probe functions etc. 579 * These functions may often be marked __init and we do not want to 580 * warn here. 581 * the pattern is identified by: 582 * tosec = .init.text | .exit.text | .init.data 583 * fromsec = .data 584 * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one 585 * 586 * Pattern 3: 587 * Some symbols belong to init section but still it is ok to reference 588 * these from non-init sections as these symbols don't have any memory 589 * allocated for them and symbol address and value are same. So even 590 * if init section is freed, its ok to reference those symbols. 591 * For ex. symbols marking the init section boundaries. 592 * This pattern is identified by 593 * refsymname = __init_begin, _sinittext, _einittext 594 **/ 595 static int secref_whitelist(const char *modname, const char *tosec, 596 const char *fromsec, const char *atsym, 597 const char *refsymname) 598 { 599 int f1 = 1, f2 = 1; 600 const char **s; 601 const char *pat2sym[] = { 602 "driver", 603 "_template", /* scsi uses *_template a lot */ 604 "_sht", /* scsi also used *_sht to some extent */ 605 "_ops", 606 "_probe", 607 "_probe_one", 608 "_console", 609 NULL 610 }; 611 612 const char *pat3refsym[] = { 613 "__init_begin", 614 "_sinittext", 615 "_einittext", 616 NULL 617 }; 618 619 /* Check for pattern 1 */ 620 if (strcmp(tosec, ".init.data") != 0) 621 f1 = 0; 622 if (strncmp(fromsec, ".data", strlen(".data")) != 0) 623 f1 = 0; 624 if (strncmp(atsym, "__param", strlen("__param")) != 0) 625 f1 = 0; 626 627 if (f1) 628 return f1; 629 630 /* Check for pattern 2 */ 631 if ((strcmp(tosec, ".init.text") != 0) && 632 (strcmp(tosec, ".exit.text") != 0) && 633 (strcmp(tosec, ".init.data") != 0)) 634 f2 = 0; 635 if (strcmp(fromsec, ".data") != 0) 636 f2 = 0; 637 638 for (s = pat2sym; *s; s++) 639 if (strrcmp(atsym, *s) == 0) 640 f1 = 1; 641 if (f1 && f2) 642 return 1; 643 644 /* Whitelist all references from .pci_fixup section if vmlinux 645 * Whitelist all refereces from .text.head to .init.data if vmlinux 646 * Whitelist all refereces from .text.head to .init.text if vmlinux 647 */ 648 if (is_vmlinux(modname)) { 649 if ((strcmp(fromsec, ".pci_fixup") == 0) && 650 (strcmp(tosec, ".init.text") == 0)) 651 return 1; 652 653 if ((strcmp(fromsec, ".text.head") == 0) && 654 ((strcmp(tosec, ".init.data") == 0) || 655 (strcmp(tosec, ".init.text") == 0))) 656 return 1; 657 658 /* Check for pattern 3 */ 659 for (s = pat3refsym; *s; s++) 660 if (strcmp(refsymname, *s) == 0) 661 return 1; 662 } 663 return 0; 664 } 665 666 /** 667 * Find symbol based on relocation record info. 668 * In some cases the symbol supplied is a valid symbol so 669 * return refsym. If st_name != 0 we assume this is a valid symbol. 670 * In other cases the symbol needs to be looked up in the symbol table 671 * based on section and address. 672 * **/ 673 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, 674 Elf_Sym *relsym) 675 { 676 Elf_Sym *sym; 677 678 if (relsym->st_name != 0) 679 return relsym; 680 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { 681 if (sym->st_shndx != relsym->st_shndx) 682 continue; 683 if (sym->st_value == addr) 684 return sym; 685 } 686 return NULL; 687 } 688 689 static inline int is_arm_mapping_symbol(const char *str) 690 { 691 return str[0] == '$' && strchr("atd", str[1]) 692 && (str[2] == '\0' || str[2] == '.'); 693 } 694 695 /* 696 * If there's no name there, ignore it; likewise, ignore it if it's 697 * one of the magic symbols emitted used by current ARM tools. 698 * 699 * Otherwise if find_symbols_between() returns those symbols, they'll 700 * fail the whitelist tests and cause lots of false alarms ... fixable 701 * only by merging __exit and __init sections into __text, bloating 702 * the kernel (which is especially evil on embedded platforms). 703 */ 704 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) 705 { 706 const char *name = elf->strtab + sym->st_name; 707 708 if (!name || !strlen(name)) 709 return 0; 710 return !is_arm_mapping_symbol(name); 711 } 712 713 /* 714 * Find symbols before or equal addr and after addr - in the section sec. 715 * If we find two symbols with equal offset prefer one with a valid name. 716 * The ELF format may have a better way to detect what type of symbol 717 * it is, but this works for now. 718 **/ 719 static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, 720 const char *sec, 721 Elf_Sym **before, Elf_Sym **after) 722 { 723 Elf_Sym *sym; 724 Elf_Ehdr *hdr = elf->hdr; 725 Elf_Addr beforediff = ~0; 726 Elf_Addr afterdiff = ~0; 727 const char *secstrings = (void *)hdr + 728 elf->sechdrs[hdr->e_shstrndx].sh_offset; 729 730 *before = NULL; 731 *after = NULL; 732 733 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { 734 const char *symsec; 735 736 if (sym->st_shndx >= SHN_LORESERVE) 737 continue; 738 symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; 739 if (strcmp(symsec, sec) != 0) 740 continue; 741 if (!is_valid_name(elf, sym)) 742 continue; 743 if (sym->st_value <= addr) { 744 if ((addr - sym->st_value) < beforediff) { 745 beforediff = addr - sym->st_value; 746 *before = sym; 747 } 748 else if ((addr - sym->st_value) == beforediff) { 749 *before = sym; 750 } 751 } 752 else 753 { 754 if ((sym->st_value - addr) < afterdiff) { 755 afterdiff = sym->st_value - addr; 756 *after = sym; 757 } 758 else if ((sym->st_value - addr) == afterdiff) { 759 *after = sym; 760 } 761 } 762 } 763 } 764 765 /** 766 * Print a warning about a section mismatch. 767 * Try to find symbols near it so user can find it. 768 * Check whitelist before warning - it may be a false positive. 769 **/ 770 static void warn_sec_mismatch(const char *modname, const char *fromsec, 771 struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) 772 { 773 const char *refsymname = ""; 774 Elf_Sym *before, *after; 775 Elf_Sym *refsym; 776 Elf_Ehdr *hdr = elf->hdr; 777 Elf_Shdr *sechdrs = elf->sechdrs; 778 const char *secstrings = (void *)hdr + 779 sechdrs[hdr->e_shstrndx].sh_offset; 780 const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; 781 782 find_symbols_between(elf, r.r_offset, fromsec, &before, &after); 783 784 refsym = find_elf_symbol(elf, r.r_addend, sym); 785 if (refsym && strlen(elf->strtab + refsym->st_name)) 786 refsymname = elf->strtab + refsym->st_name; 787 788 /* check whitelist - we may ignore it */ 789 if (before && 790 secref_whitelist(modname, secname, fromsec, 791 elf->strtab + before->st_name, refsymname)) 792 return; 793 794 if (before && after) { 795 warn("%s - Section mismatch: reference to %s:%s from %s " 796 "between '%s' (at offset 0x%llx) and '%s'\n", 797 modname, secname, refsymname, fromsec, 798 elf->strtab + before->st_name, 799 (long long)r.r_offset, 800 elf->strtab + after->st_name); 801 } else if (before) { 802 warn("%s - Section mismatch: reference to %s:%s from %s " 803 "after '%s' (at offset 0x%llx)\n", 804 modname, secname, refsymname, fromsec, 805 elf->strtab + before->st_name, 806 (long long)r.r_offset); 807 } else if (after) { 808 warn("%s - Section mismatch: reference to %s:%s from %s " 809 "before '%s' (at offset -0x%llx)\n", 810 modname, secname, refsymname, fromsec, 811 elf->strtab + after->st_name, 812 (long long)r.r_offset); 813 } else { 814 warn("%s - Section mismatch: reference to %s:%s from %s " 815 "(offset 0x%llx)\n", 816 modname, secname, fromsec, refsymname, 817 (long long)r.r_offset); 818 } 819 } 820 821 /** 822 * A module includes a number of sections that are discarded 823 * either when loaded or when used as built-in. 824 * For loaded modules all functions marked __init and all data 825 * marked __initdata will be discarded when the module has been intialized. 826 * Likewise for modules used built-in the sections marked __exit 827 * are discarded because __exit marked function are supposed to be called 828 * only when a moduel is unloaded which never happes for built-in modules. 829 * The check_sec_ref() function traverses all relocation records 830 * to find all references to a section that reference a section that will 831 * be discarded and warns about it. 832 **/ 833 static void check_sec_ref(struct module *mod, const char *modname, 834 struct elf_info *elf, 835 int section(const char*), 836 int section_ref_ok(const char *)) 837 { 838 int i; 839 Elf_Sym *sym; 840 Elf_Ehdr *hdr = elf->hdr; 841 Elf_Shdr *sechdrs = elf->sechdrs; 842 const char *secstrings = (void *)hdr + 843 sechdrs[hdr->e_shstrndx].sh_offset; 844 845 /* Walk through all sections */ 846 for (i = 0; i < hdr->e_shnum; i++) { 847 const char *name = secstrings + sechdrs[i].sh_name; 848 const char *secname; 849 Elf_Rela r; 850 unsigned int r_sym; 851 /* We want to process only relocation sections and not .init */ 852 if (sechdrs[i].sh_type == SHT_RELA) { 853 Elf_Rela *rela; 854 Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; 855 Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; 856 name += strlen(".rela"); 857 if (section_ref_ok(name)) 858 continue; 859 860 for (rela = start; rela < stop; rela++) { 861 r.r_offset = TO_NATIVE(rela->r_offset); 862 #if KERNEL_ELFCLASS == ELFCLASS64 863 if (hdr->e_machine == EM_MIPS) { 864 r_sym = ELF64_MIPS_R_SYM(rela->r_info); 865 r_sym = TO_NATIVE(r_sym); 866 } else { 867 r.r_info = TO_NATIVE(rela->r_info); 868 r_sym = ELF_R_SYM(r.r_info); 869 } 870 #else 871 r.r_info = TO_NATIVE(rela->r_info); 872 r_sym = ELF_R_SYM(r.r_info); 873 #endif 874 r.r_addend = TO_NATIVE(rela->r_addend); 875 sym = elf->symtab_start + r_sym; 876 /* Skip special sections */ 877 if (sym->st_shndx >= SHN_LORESERVE) 878 continue; 879 880 secname = secstrings + 881 sechdrs[sym->st_shndx].sh_name; 882 if (section(secname)) 883 warn_sec_mismatch(modname, name, 884 elf, sym, r); 885 } 886 } else if (sechdrs[i].sh_type == SHT_REL) { 887 Elf_Rel *rel; 888 Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; 889 Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; 890 name += strlen(".rel"); 891 if (section_ref_ok(name)) 892 continue; 893 894 for (rel = start; rel < stop; rel++) { 895 r.r_offset = TO_NATIVE(rel->r_offset); 896 #if KERNEL_ELFCLASS == ELFCLASS64 897 if (hdr->e_machine == EM_MIPS) { 898 r_sym = ELF64_MIPS_R_SYM(rel->r_info); 899 r_sym = TO_NATIVE(r_sym); 900 } else { 901 r.r_info = TO_NATIVE(rel->r_info); 902 r_sym = ELF_R_SYM(r.r_info); 903 } 904 #else 905 r.r_info = TO_NATIVE(rel->r_info); 906 r_sym = ELF_R_SYM(r.r_info); 907 #endif 908 r.r_addend = 0; 909 sym = elf->symtab_start + r_sym; 910 /* Skip special sections */ 911 if (sym->st_shndx >= SHN_LORESERVE) 912 continue; 913 914 secname = secstrings + 915 sechdrs[sym->st_shndx].sh_name; 916 if (section(secname)) 917 warn_sec_mismatch(modname, name, 918 elf, sym, r); 919 } 920 } 921 } 922 } 923 924 /** 925 * Functions used only during module init is marked __init and is stored in 926 * a .init.text section. Likewise data is marked __initdata and stored in 927 * a .init.data section. 928 * If this section is one of these sections return 1 929 * See include/linux/init.h for the details 930 **/ 931 static int init_section(const char *name) 932 { 933 if (strcmp(name, ".init") == 0) 934 return 1; 935 if (strncmp(name, ".init.", strlen(".init.")) == 0) 936 return 1; 937 return 0; 938 } 939 940 /** 941 * Identify sections from which references to a .init section is OK. 942 * 943 * Unfortunately references to read only data that referenced .init 944 * sections had to be excluded. Almost all of these are false 945 * positives, they are created by gcc. The downside of excluding rodata 946 * is that there really are some user references from rodata to 947 * init code, e.g. drivers/video/vgacon.c: 948 * 949 * const struct consw vga_con = { 950 * con_startup: vgacon_startup, 951 * 952 * where vgacon_startup is __init. If you want to wade through the false 953 * positives, take out the check for rodata. 954 **/ 955 static int init_section_ref_ok(const char *name) 956 { 957 const char **s; 958 /* Absolute section names */ 959 const char *namelist1[] = { 960 ".init", 961 ".opd", /* see comment [OPD] at exit_section_ref_ok() */ 962 ".toc1", /* used by ppc64 */ 963 ".stab", 964 ".data.rel.ro", /* used by parisc64 */ 965 ".parainstructions", 966 ".text.lock", 967 "__bug_table", /* used by powerpc for BUG() */ 968 ".pci_fixup_header", 969 ".pci_fixup_final", 970 ".pdr", 971 "__param", 972 "__ex_table", 973 ".fixup", 974 ".smp_locks", 975 ".plt", /* seen on ARCH=um build on x86_64. Harmless */ 976 "__ftr_fixup", /* powerpc cpu feature fixup */ 977 "__fw_ftr_fixup", /* powerpc firmware feature fixup */ 978 NULL 979 }; 980 /* Start of section names */ 981 const char *namelist2[] = { 982 ".init.", 983 ".altinstructions", 984 ".eh_frame", 985 ".debug", 986 ".parainstructions", 987 ".rodata", 988 NULL 989 }; 990 /* part of section name */ 991 const char *namelist3 [] = { 992 ".unwind", /* sample: IA_64.unwind.init.text */ 993 NULL 994 }; 995 996 for (s = namelist1; *s; s++) 997 if (strcmp(*s, name) == 0) 998 return 1; 999 for (s = namelist2; *s; s++) 1000 if (strncmp(*s, name, strlen(*s)) == 0) 1001 return 1; 1002 for (s = namelist3; *s; s++) 1003 if (strstr(name, *s) != NULL) 1004 return 1; 1005 if (strrcmp(name, ".init") == 0) 1006 return 1; 1007 return 0; 1008 } 1009 1010 /* 1011 * Functions used only during module exit is marked __exit and is stored in 1012 * a .exit.text section. Likewise data is marked __exitdata and stored in 1013 * a .exit.data section. 1014 * If this section is one of these sections return 1 1015 * See include/linux/init.h for the details 1016 **/ 1017 static int exit_section(const char *name) 1018 { 1019 if (strcmp(name, ".exit.text") == 0) 1020 return 1; 1021 if (strcmp(name, ".exit.data") == 0) 1022 return 1; 1023 return 0; 1024 1025 } 1026 1027 /* 1028 * Identify sections from which references to a .exit section is OK. 1029 * 1030 * [OPD] Keith Ownes <kaos@sgi.com> commented: 1031 * For our future {in}sanity, add a comment that this is the ppc .opd 1032 * section, not the ia64 .opd section. 1033 * ia64 .opd should not point to discarded sections. 1034 * [.rodata] like for .init.text we ignore .rodata references -same reason 1035 **/ 1036 static int exit_section_ref_ok(const char *name) 1037 { 1038 const char **s; 1039 /* Absolute section names */ 1040 const char *namelist1[] = { 1041 ".exit.text", 1042 ".exit.data", 1043 ".init.text", 1044 ".rodata", 1045 ".opd", /* See comment [OPD] */ 1046 ".toc1", /* used by ppc64 */ 1047 ".altinstructions", 1048 ".pdr", 1049 "__bug_table", /* used by powerpc for BUG() */ 1050 ".exitcall.exit", 1051 ".eh_frame", 1052 ".parainstructions", 1053 ".stab", 1054 "__ex_table", 1055 ".fixup", 1056 ".smp_locks", 1057 ".plt", /* seen on ARCH=um build on x86_64. Harmless */ 1058 NULL 1059 }; 1060 /* Start of section names */ 1061 const char *namelist2[] = { 1062 ".debug", 1063 NULL 1064 }; 1065 /* part of section name */ 1066 const char *namelist3 [] = { 1067 ".unwind", /* Sample: IA_64.unwind.exit.text */ 1068 NULL 1069 }; 1070 1071 for (s = namelist1; *s; s++) 1072 if (strcmp(*s, name) == 0) 1073 return 1; 1074 for (s = namelist2; *s; s++) 1075 if (strncmp(*s, name, strlen(*s)) == 0) 1076 return 1; 1077 for (s = namelist3; *s; s++) 1078 if (strstr(name, *s) != NULL) 1079 return 1; 1080 return 0; 1081 } 1082 1083 static void read_symbols(char *modname) 1084 { 1085 const char *symname; 1086 char *version; 1087 char *license; 1088 struct module *mod; 1089 struct elf_info info = { }; 1090 Elf_Sym *sym; 1091 1092 parse_elf(&info, modname); 1093 1094 mod = new_module(modname); 1095 1096 /* When there's no vmlinux, don't print warnings about 1097 * unresolved symbols (since there'll be too many ;) */ 1098 if (is_vmlinux(modname)) { 1099 have_vmlinux = 1; 1100 mod->skip = 1; 1101 } 1102 1103 license = get_modinfo(info.modinfo, info.modinfo_len, "license"); 1104 while (license) { 1105 if (license_is_gpl_compatible(license)) 1106 mod->gpl_compatible = 1; 1107 else { 1108 mod->gpl_compatible = 0; 1109 break; 1110 } 1111 license = get_next_modinfo(info.modinfo, info.modinfo_len, 1112 "license", license); 1113 } 1114 1115 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { 1116 symname = info.strtab + sym->st_name; 1117 1118 handle_modversions(mod, &info, sym, symname); 1119 handle_moddevtable(mod, &info, sym, symname); 1120 } 1121 check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); 1122 check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); 1123 1124 version = get_modinfo(info.modinfo, info.modinfo_len, "version"); 1125 if (version) 1126 maybe_frob_rcs_version(modname, version, info.modinfo, 1127 version - (char *)info.hdr); 1128 if (version || (all_versions && !is_vmlinux(modname))) 1129 get_src_version(modname, mod->srcversion, 1130 sizeof(mod->srcversion)-1); 1131 1132 parse_elf_finish(&info); 1133 1134 /* Our trick to get versioning for struct_module - it's 1135 * never passed as an argument to an exported function, so 1136 * the automatic versioning doesn't pick it up, but it's really 1137 * important anyhow */ 1138 if (modversions) 1139 mod->unres = alloc_symbol("struct_module", 0, mod->unres); 1140 } 1141 1142 #define SZ 500 1143 1144 /* We first write the generated file into memory using the 1145 * following helper, then compare to the file on disk and 1146 * only update the later if anything changed */ 1147 1148 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, 1149 const char *fmt, ...) 1150 { 1151 char tmp[SZ]; 1152 int len; 1153 va_list ap; 1154 1155 va_start(ap, fmt); 1156 len = vsnprintf(tmp, SZ, fmt, ap); 1157 buf_write(buf, tmp, len); 1158 va_end(ap); 1159 } 1160 1161 void buf_write(struct buffer *buf, const char *s, int len) 1162 { 1163 if (buf->size - buf->pos < len) { 1164 buf->size += len + SZ; 1165 buf->p = realloc(buf->p, buf->size); 1166 } 1167 strncpy(buf->p + buf->pos, s, len); 1168 buf->pos += len; 1169 } 1170 1171 static void check_for_gpl_usage(enum export exp, const char *m, const char *s) 1172 { 1173 const char *e = is_vmlinux(m) ?"":".ko"; 1174 1175 switch (exp) { 1176 case export_gpl: 1177 fatal("modpost: GPL-incompatible module %s%s " 1178 "uses GPL-only symbol '%s'\n", m, e, s); 1179 break; 1180 case export_unused_gpl: 1181 fatal("modpost: GPL-incompatible module %s%s " 1182 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); 1183 break; 1184 case export_gpl_future: 1185 warn("modpost: GPL-incompatible module %s%s " 1186 "uses future GPL-only symbol '%s'\n", m, e, s); 1187 break; 1188 case export_plain: 1189 case export_unused: 1190 case export_unknown: 1191 /* ignore */ 1192 break; 1193 } 1194 } 1195 1196 static void check_for_unused(enum export exp, const char* m, const char* s) 1197 { 1198 const char *e = is_vmlinux(m) ?"":".ko"; 1199 1200 switch (exp) { 1201 case export_unused: 1202 case export_unused_gpl: 1203 warn("modpost: module %s%s " 1204 "uses symbol '%s' marked UNUSED\n", m, e, s); 1205 break; 1206 default: 1207 /* ignore */ 1208 break; 1209 } 1210 } 1211 1212 static void check_exports(struct module *mod) 1213 { 1214 struct symbol *s, *exp; 1215 1216 for (s = mod->unres; s; s = s->next) { 1217 const char *basename; 1218 exp = find_symbol(s->name); 1219 if (!exp || exp->module == mod) 1220 continue; 1221 basename = strrchr(mod->name, '/'); 1222 if (basename) 1223 basename++; 1224 else 1225 basename = mod->name; 1226 if (!mod->gpl_compatible) 1227 check_for_gpl_usage(exp->export, basename, exp->name); 1228 check_for_unused(exp->export, basename, exp->name); 1229 } 1230 } 1231 1232 /** 1233 * Header for the generated file 1234 **/ 1235 static void add_header(struct buffer *b, struct module *mod) 1236 { 1237 buf_printf(b, "#include <linux/module.h>\n"); 1238 buf_printf(b, "#include <linux/vermagic.h>\n"); 1239 buf_printf(b, "#include <linux/compiler.h>\n"); 1240 buf_printf(b, "\n"); 1241 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); 1242 buf_printf(b, "\n"); 1243 buf_printf(b, "struct module __this_module\n"); 1244 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); 1245 buf_printf(b, " .name = KBUILD_MODNAME,\n"); 1246 if (mod->has_init) 1247 buf_printf(b, " .init = init_module,\n"); 1248 if (mod->has_cleanup) 1249 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" 1250 " .exit = cleanup_module,\n" 1251 "#endif\n"); 1252 buf_printf(b, "};\n"); 1253 } 1254 1255 /** 1256 * Record CRCs for unresolved symbols 1257 **/ 1258 static int add_versions(struct buffer *b, struct module *mod) 1259 { 1260 struct symbol *s, *exp; 1261 int err = 0; 1262 1263 for (s = mod->unres; s; s = s->next) { 1264 exp = find_symbol(s->name); 1265 if (!exp || exp->module == mod) { 1266 if (have_vmlinux && !s->weak) { 1267 warn("\"%s\" [%s.ko] undefined!\n", 1268 s->name, mod->name); 1269 err = warn_unresolved ? 0 : 1; 1270 } 1271 continue; 1272 } 1273 s->module = exp->module; 1274 s->crc_valid = exp->crc_valid; 1275 s->crc = exp->crc; 1276 } 1277 1278 if (!modversions) 1279 return err; 1280 1281 buf_printf(b, "\n"); 1282 buf_printf(b, "static const struct modversion_info ____versions[]\n"); 1283 buf_printf(b, "__attribute_used__\n"); 1284 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); 1285 1286 for (s = mod->unres; s; s = s->next) { 1287 if (!s->module) { 1288 continue; 1289 } 1290 if (!s->crc_valid) { 1291 warn("\"%s\" [%s.ko] has no CRC!\n", 1292 s->name, mod->name); 1293 continue; 1294 } 1295 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); 1296 } 1297 1298 buf_printf(b, "};\n"); 1299 1300 return err; 1301 } 1302 1303 static void add_depends(struct buffer *b, struct module *mod, 1304 struct module *modules) 1305 { 1306 struct symbol *s; 1307 struct module *m; 1308 int first = 1; 1309 1310 for (m = modules; m; m = m->next) { 1311 m->seen = is_vmlinux(m->name); 1312 } 1313 1314 buf_printf(b, "\n"); 1315 buf_printf(b, "static const char __module_depends[]\n"); 1316 buf_printf(b, "__attribute_used__\n"); 1317 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); 1318 buf_printf(b, "\"depends="); 1319 for (s = mod->unres; s; s = s->next) { 1320 if (!s->module) 1321 continue; 1322 1323 if (s->module->seen) 1324 continue; 1325 1326 s->module->seen = 1; 1327 buf_printf(b, "%s%s", first ? "" : ",", 1328 strrchr(s->module->name, '/') + 1); 1329 first = 0; 1330 } 1331 buf_printf(b, "\";\n"); 1332 } 1333 1334 static void add_srcversion(struct buffer *b, struct module *mod) 1335 { 1336 if (mod->srcversion[0]) { 1337 buf_printf(b, "\n"); 1338 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", 1339 mod->srcversion); 1340 } 1341 } 1342 1343 static void write_if_changed(struct buffer *b, const char *fname) 1344 { 1345 char *tmp; 1346 FILE *file; 1347 struct stat st; 1348 1349 file = fopen(fname, "r"); 1350 if (!file) 1351 goto write; 1352 1353 if (fstat(fileno(file), &st) < 0) 1354 goto close_write; 1355 1356 if (st.st_size != b->pos) 1357 goto close_write; 1358 1359 tmp = NOFAIL(malloc(b->pos)); 1360 if (fread(tmp, 1, b->pos, file) != b->pos) 1361 goto free_write; 1362 1363 if (memcmp(tmp, b->p, b->pos) != 0) 1364 goto free_write; 1365 1366 free(tmp); 1367 fclose(file); 1368 return; 1369 1370 free_write: 1371 free(tmp); 1372 close_write: 1373 fclose(file); 1374 write: 1375 file = fopen(fname, "w"); 1376 if (!file) { 1377 perror(fname); 1378 exit(1); 1379 } 1380 if (fwrite(b->p, 1, b->pos, file) != b->pos) { 1381 perror(fname); 1382 exit(1); 1383 } 1384 fclose(file); 1385 } 1386 1387 /* parse Module.symvers file. line format: 1388 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] 1389 **/ 1390 static void read_dump(const char *fname, unsigned int kernel) 1391 { 1392 unsigned long size, pos = 0; 1393 void *file = grab_file(fname, &size); 1394 char *line; 1395 1396 if (!file) 1397 /* No symbol versions, silently ignore */ 1398 return; 1399 1400 while ((line = get_next_line(&pos, file, size))) { 1401 char *symname, *modname, *d, *export, *end; 1402 unsigned int crc; 1403 struct module *mod; 1404 struct symbol *s; 1405 1406 if (!(symname = strchr(line, '\t'))) 1407 goto fail; 1408 *symname++ = '\0'; 1409 if (!(modname = strchr(symname, '\t'))) 1410 goto fail; 1411 *modname++ = '\0'; 1412 if ((export = strchr(modname, '\t')) != NULL) 1413 *export++ = '\0'; 1414 if (export && ((end = strchr(export, '\t')) != NULL)) 1415 *end = '\0'; 1416 crc = strtoul(line, &d, 16); 1417 if (*symname == '\0' || *modname == '\0' || *d != '\0') 1418 goto fail; 1419 1420 if (!(mod = find_module(modname))) { 1421 if (is_vmlinux(modname)) { 1422 have_vmlinux = 1; 1423 } 1424 mod = new_module(NOFAIL(strdup(modname))); 1425 mod->skip = 1; 1426 } 1427 s = sym_add_exported(symname, mod, export_no(export)); 1428 s->kernel = kernel; 1429 s->preloaded = 1; 1430 sym_update_crc(symname, mod, crc, export_no(export)); 1431 } 1432 return; 1433 fail: 1434 fatal("parse error in symbol dump file\n"); 1435 } 1436 1437 /* For normal builds always dump all symbols. 1438 * For external modules only dump symbols 1439 * that are not read from kernel Module.symvers. 1440 **/ 1441 static int dump_sym(struct symbol *sym) 1442 { 1443 if (!external_module) 1444 return 1; 1445 if (sym->vmlinux || sym->kernel) 1446 return 0; 1447 return 1; 1448 } 1449 1450 static void write_dump(const char *fname) 1451 { 1452 struct buffer buf = { }; 1453 struct symbol *symbol; 1454 int n; 1455 1456 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { 1457 symbol = symbolhash[n]; 1458 while (symbol) { 1459 if (dump_sym(symbol)) 1460 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", 1461 symbol->crc, symbol->name, 1462 symbol->module->name, 1463 export_str(symbol->export)); 1464 symbol = symbol->next; 1465 } 1466 } 1467 write_if_changed(&buf, fname); 1468 } 1469 1470 int main(int argc, char **argv) 1471 { 1472 struct module *mod; 1473 struct buffer buf = { }; 1474 char fname[SZ]; 1475 char *kernel_read = NULL, *module_read = NULL; 1476 char *dump_write = NULL; 1477 int opt; 1478 int err; 1479 1480 while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) { 1481 switch(opt) { 1482 case 'i': 1483 kernel_read = optarg; 1484 break; 1485 case 'I': 1486 module_read = optarg; 1487 external_module = 1; 1488 break; 1489 case 'm': 1490 modversions = 1; 1491 break; 1492 case 'o': 1493 dump_write = optarg; 1494 break; 1495 case 'a': 1496 all_versions = 1; 1497 break; 1498 case 'w': 1499 warn_unresolved = 1; 1500 break; 1501 default: 1502 exit(1); 1503 } 1504 } 1505 1506 if (kernel_read) 1507 read_dump(kernel_read, 1); 1508 if (module_read) 1509 read_dump(module_read, 0); 1510 1511 while (optind < argc) { 1512 read_symbols(argv[optind++]); 1513 } 1514 1515 for (mod = modules; mod; mod = mod->next) { 1516 if (mod->skip) 1517 continue; 1518 check_exports(mod); 1519 } 1520 1521 err = 0; 1522 1523 for (mod = modules; mod; mod = mod->next) { 1524 if (mod->skip) 1525 continue; 1526 1527 buf.pos = 0; 1528 1529 add_header(&buf, mod); 1530 err |= add_versions(&buf, mod); 1531 add_depends(&buf, mod, modules); 1532 add_moddevtable(&buf, mod); 1533 add_srcversion(&buf, mod); 1534 1535 sprintf(fname, "%s.mod.c", mod->name); 1536 write_if_changed(&buf, fname); 1537 } 1538 1539 if (dump_write) 1540 write_dump(dump_write); 1541 1542 return err; 1543 } 1544