1 /* Postprocess module symbol versions 2 * 3 * Copyright 2003 Kai Germaschewski 4 * Copyright 2002-2004 Rusty Russell, IBM Corporation 5 * Copyright 2006-2008 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 #define _GNU_SOURCE 15 #include <stdio.h> 16 #include <ctype.h> 17 #include "modpost.h" 18 #include "../../include/linux/license.h" 19 20 /* Are we using CONFIG_MODVERSIONS? */ 21 int modversions = 0; 22 /* Warn about undefined symbols? (do so if we have vmlinux) */ 23 int have_vmlinux = 0; 24 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ 25 static int all_versions = 0; 26 /* If we are modposting external module set to 1 */ 27 static int external_module = 0; 28 /* Warn about section mismatch in vmlinux if set to 1 */ 29 static int vmlinux_section_warnings = 1; 30 /* Only warn about unresolved symbols */ 31 static int warn_unresolved = 0; 32 /* How a symbol is exported */ 33 static int sec_mismatch_count = 0; 34 static int sec_mismatch_verbose = 1; 35 36 enum export { 37 export_plain, export_unused, export_gpl, 38 export_unused_gpl, export_gpl_future, export_unknown 39 }; 40 41 #define PRINTF __attribute__ ((format (printf, 1, 2))) 42 43 PRINTF void fatal(const char *fmt, ...) 44 { 45 va_list arglist; 46 47 fprintf(stderr, "FATAL: "); 48 49 va_start(arglist, fmt); 50 vfprintf(stderr, fmt, arglist); 51 va_end(arglist); 52 53 exit(1); 54 } 55 56 PRINTF void warn(const char *fmt, ...) 57 { 58 va_list arglist; 59 60 fprintf(stderr, "WARNING: "); 61 62 va_start(arglist, fmt); 63 vfprintf(stderr, fmt, arglist); 64 va_end(arglist); 65 } 66 67 PRINTF void merror(const char *fmt, ...) 68 { 69 va_list arglist; 70 71 fprintf(stderr, "ERROR: "); 72 73 va_start(arglist, fmt); 74 vfprintf(stderr, fmt, arglist); 75 va_end(arglist); 76 } 77 78 static int is_vmlinux(const char *modname) 79 { 80 const char *myname; 81 82 myname = strrchr(modname, '/'); 83 if (myname) 84 myname++; 85 else 86 myname = modname; 87 88 return (strcmp(myname, "vmlinux") == 0) || 89 (strcmp(myname, "vmlinux.o") == 0); 90 } 91 92 void *do_nofail(void *ptr, const char *expr) 93 { 94 if (!ptr) 95 fatal("modpost: Memory allocation failure: %s.\n", expr); 96 97 return ptr; 98 } 99 100 /* A list of all modules we processed */ 101 static struct module *modules; 102 103 static struct module *find_module(char *modname) 104 { 105 struct module *mod; 106 107 for (mod = modules; mod; mod = mod->next) 108 if (strcmp(mod->name, modname) == 0) 109 break; 110 return mod; 111 } 112 113 static struct module *new_module(char *modname) 114 { 115 struct module *mod; 116 char *p, *s; 117 118 mod = NOFAIL(malloc(sizeof(*mod))); 119 memset(mod, 0, sizeof(*mod)); 120 p = NOFAIL(strdup(modname)); 121 122 /* strip trailing .o */ 123 s = strrchr(p, '.'); 124 if (s != NULL) 125 if (strcmp(s, ".o") == 0) 126 *s = '\0'; 127 128 /* add to list */ 129 mod->name = p; 130 mod->gpl_compatible = -1; 131 mod->next = modules; 132 modules = mod; 133 134 return mod; 135 } 136 137 /* A hash of all exported symbols, 138 * struct symbol is also used for lists of unresolved symbols */ 139 140 #define SYMBOL_HASH_SIZE 1024 141 142 struct symbol { 143 struct symbol *next; 144 struct module *module; 145 unsigned int crc; 146 int crc_valid; 147 unsigned int weak:1; 148 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ 149 unsigned int kernel:1; /* 1 if symbol is from kernel 150 * (only for external modules) **/ 151 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ 152 enum export export; /* Type of export */ 153 char name[0]; 154 }; 155 156 static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; 157 158 /* This is based on the hash agorithm from gdbm, via tdb */ 159 static inline unsigned int tdb_hash(const char *name) 160 { 161 unsigned value; /* Used to compute the hash value. */ 162 unsigned i; /* Used to cycle through random values. */ 163 164 /* Set the initial value from the key size. */ 165 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) 166 value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); 167 168 return (1103515243 * value + 12345); 169 } 170 171 /** 172 * Allocate a new symbols for use in the hash of exported symbols or 173 * the list of unresolved symbols per module 174 **/ 175 static struct symbol *alloc_symbol(const char *name, unsigned int weak, 176 struct symbol *next) 177 { 178 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); 179 180 memset(s, 0, sizeof(*s)); 181 strcpy(s->name, name); 182 s->weak = weak; 183 s->next = next; 184 return s; 185 } 186 187 /* For the hash of exported symbols */ 188 static struct symbol *new_symbol(const char *name, struct module *module, 189 enum export export) 190 { 191 unsigned int hash; 192 struct symbol *new; 193 194 hash = tdb_hash(name) % SYMBOL_HASH_SIZE; 195 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); 196 new->module = module; 197 new->export = export; 198 return new; 199 } 200 201 static struct symbol *find_symbol(const char *name) 202 { 203 struct symbol *s; 204 205 /* For our purposes, .foo matches foo. PPC64 needs this. */ 206 if (name[0] == '.') 207 name++; 208 209 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { 210 if (strcmp(s->name, name) == 0) 211 return s; 212 } 213 return NULL; 214 } 215 216 static struct { 217 const char *str; 218 enum export export; 219 } export_list[] = { 220 { .str = "EXPORT_SYMBOL", .export = export_plain }, 221 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, 222 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, 223 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, 224 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, 225 { .str = "(unknown)", .export = export_unknown }, 226 }; 227 228 229 static const char *export_str(enum export ex) 230 { 231 return export_list[ex].str; 232 } 233 234 static enum export export_no(const char *s) 235 { 236 int i; 237 238 if (!s) 239 return export_unknown; 240 for (i = 0; export_list[i].export != export_unknown; i++) { 241 if (strcmp(export_list[i].str, s) == 0) 242 return export_list[i].export; 243 } 244 return export_unknown; 245 } 246 247 static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) 248 { 249 if (sec == elf->export_sec) 250 return export_plain; 251 else if (sec == elf->export_unused_sec) 252 return export_unused; 253 else if (sec == elf->export_gpl_sec) 254 return export_gpl; 255 else if (sec == elf->export_unused_gpl_sec) 256 return export_unused_gpl; 257 else if (sec == elf->export_gpl_future_sec) 258 return export_gpl_future; 259 else 260 return export_unknown; 261 } 262 263 /** 264 * Add an exported symbol - it may have already been added without a 265 * CRC, in this case just update the CRC 266 **/ 267 static struct symbol *sym_add_exported(const char *name, struct module *mod, 268 enum export export) 269 { 270 struct symbol *s = find_symbol(name); 271 272 if (!s) { 273 s = new_symbol(name, mod, export); 274 } else { 275 if (!s->preloaded) { 276 warn("%s: '%s' exported twice. Previous export " 277 "was in %s%s\n", mod->name, name, 278 s->module->name, 279 is_vmlinux(s->module->name) ?"":".ko"); 280 } else { 281 /* In case Modules.symvers was out of date */ 282 s->module = mod; 283 } 284 } 285 s->preloaded = 0; 286 s->vmlinux = is_vmlinux(mod->name); 287 s->kernel = 0; 288 s->export = export; 289 return s; 290 } 291 292 static void sym_update_crc(const char *name, struct module *mod, 293 unsigned int crc, enum export export) 294 { 295 struct symbol *s = find_symbol(name); 296 297 if (!s) 298 s = new_symbol(name, mod, export); 299 s->crc = crc; 300 s->crc_valid = 1; 301 } 302 303 void *grab_file(const char *filename, unsigned long *size) 304 { 305 struct stat st; 306 void *map; 307 int fd; 308 309 fd = open(filename, O_RDONLY); 310 if (fd < 0 || fstat(fd, &st) != 0) 311 return NULL; 312 313 *size = st.st_size; 314 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); 315 close(fd); 316 317 if (map == MAP_FAILED) 318 return NULL; 319 return map; 320 } 321 322 /** 323 * Return a copy of the next line in a mmap'ed file. 324 * spaces in the beginning of the line is trimmed away. 325 * Return a pointer to a static buffer. 326 **/ 327 char *get_next_line(unsigned long *pos, void *file, unsigned long size) 328 { 329 static char line[4096]; 330 int skip = 1; 331 size_t len = 0; 332 signed char *p = (signed char *)file + *pos; 333 char *s = line; 334 335 for (; *pos < size ; (*pos)++) { 336 if (skip && isspace(*p)) { 337 p++; 338 continue; 339 } 340 skip = 0; 341 if (*p != '\n' && (*pos < size)) { 342 len++; 343 *s++ = *p++; 344 if (len > 4095) 345 break; /* Too long, stop */ 346 } else { 347 /* End of string */ 348 *s = '\0'; 349 return line; 350 } 351 } 352 /* End of buffer */ 353 return NULL; 354 } 355 356 void release_file(void *file, unsigned long size) 357 { 358 munmap(file, size); 359 } 360 361 static int parse_elf(struct elf_info *info, const char *filename) 362 { 363 unsigned int i; 364 Elf_Ehdr *hdr; 365 Elf_Shdr *sechdrs; 366 Elf_Sym *sym; 367 368 hdr = grab_file(filename, &info->size); 369 if (!hdr) { 370 perror(filename); 371 exit(1); 372 } 373 info->hdr = hdr; 374 if (info->size < sizeof(*hdr)) { 375 /* file too small, assume this is an empty .o file */ 376 return 0; 377 } 378 /* Is this a valid ELF file? */ 379 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || 380 (hdr->e_ident[EI_MAG1] != ELFMAG1) || 381 (hdr->e_ident[EI_MAG2] != ELFMAG2) || 382 (hdr->e_ident[EI_MAG3] != ELFMAG3)) { 383 /* Not an ELF file - silently ignore it */ 384 return 0; 385 } 386 /* Fix endianness in ELF header */ 387 hdr->e_type = TO_NATIVE(hdr->e_type); 388 hdr->e_machine = TO_NATIVE(hdr->e_machine); 389 hdr->e_version = TO_NATIVE(hdr->e_version); 390 hdr->e_entry = TO_NATIVE(hdr->e_entry); 391 hdr->e_phoff = TO_NATIVE(hdr->e_phoff); 392 hdr->e_shoff = TO_NATIVE(hdr->e_shoff); 393 hdr->e_flags = TO_NATIVE(hdr->e_flags); 394 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); 395 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); 396 hdr->e_phnum = TO_NATIVE(hdr->e_phnum); 397 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); 398 hdr->e_shnum = TO_NATIVE(hdr->e_shnum); 399 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); 400 sechdrs = (void *)hdr + hdr->e_shoff; 401 info->sechdrs = sechdrs; 402 403 /* Check if file offset is correct */ 404 if (hdr->e_shoff > info->size) { 405 fatal("section header offset=%lu in file '%s' is bigger than " 406 "filesize=%lu\n", (unsigned long)hdr->e_shoff, 407 filename, info->size); 408 return 0; 409 } 410 411 /* Fix endianness in section headers */ 412 for (i = 0; i < hdr->e_shnum; i++) { 413 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); 414 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); 415 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); 416 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); 417 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); 418 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); 419 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); 420 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); 421 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); 422 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); 423 } 424 /* Find symbol table. */ 425 for (i = 1; i < hdr->e_shnum; i++) { 426 const char *secstrings 427 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 428 const char *secname; 429 int nobits = sechdrs[i].sh_type == SHT_NOBITS; 430 431 if (!nobits && sechdrs[i].sh_offset > info->size) { 432 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " 433 "sizeof(*hrd)=%zu\n", filename, 434 (unsigned long)sechdrs[i].sh_offset, 435 sizeof(*hdr)); 436 return 0; 437 } 438 secname = secstrings + sechdrs[i].sh_name; 439 if (strcmp(secname, ".modinfo") == 0) { 440 if (nobits) 441 fatal("%s has NOBITS .modinfo\n", filename); 442 info->modinfo = (void *)hdr + sechdrs[i].sh_offset; 443 info->modinfo_len = sechdrs[i].sh_size; 444 } else if (strcmp(secname, "__ksymtab") == 0) 445 info->export_sec = i; 446 else if (strcmp(secname, "__ksymtab_unused") == 0) 447 info->export_unused_sec = i; 448 else if (strcmp(secname, "__ksymtab_gpl") == 0) 449 info->export_gpl_sec = i; 450 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) 451 info->export_unused_gpl_sec = i; 452 else if (strcmp(secname, "__ksymtab_gpl_future") == 0) 453 info->export_gpl_future_sec = i; 454 else if (strcmp(secname, "__markers_strings") == 0) 455 info->markers_strings_sec = i; 456 457 if (sechdrs[i].sh_type != SHT_SYMTAB) 458 continue; 459 460 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; 461 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset 462 + sechdrs[i].sh_size; 463 info->strtab = (void *)hdr + 464 sechdrs[sechdrs[i].sh_link].sh_offset; 465 } 466 if (!info->symtab_start) 467 fatal("%s has no symtab?\n", filename); 468 469 /* Fix endianness in symbols */ 470 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { 471 sym->st_shndx = TO_NATIVE(sym->st_shndx); 472 sym->st_name = TO_NATIVE(sym->st_name); 473 sym->st_value = TO_NATIVE(sym->st_value); 474 sym->st_size = TO_NATIVE(sym->st_size); 475 } 476 return 1; 477 } 478 479 static void parse_elf_finish(struct elf_info *info) 480 { 481 release_file(info->hdr, info->size); 482 } 483 484 static int ignore_undef_symbol(struct elf_info *info, const char *symname) 485 { 486 /* ignore __this_module, it will be resolved shortly */ 487 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) 488 return 1; 489 /* ignore global offset table */ 490 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) 491 return 1; 492 if (info->hdr->e_machine == EM_PPC) 493 /* Special register function linked on all modules during final link of .ko */ 494 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || 495 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || 496 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || 497 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) 498 return 1; 499 /* Do not ignore this symbol */ 500 return 0; 501 } 502 503 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" 504 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" 505 506 static void handle_modversions(struct module *mod, struct elf_info *info, 507 Elf_Sym *sym, const char *symname) 508 { 509 unsigned int crc; 510 enum export export = export_from_sec(info, sym->st_shndx); 511 512 switch (sym->st_shndx) { 513 case SHN_COMMON: 514 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); 515 break; 516 case SHN_ABS: 517 /* CRC'd symbol */ 518 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { 519 crc = (unsigned int) sym->st_value; 520 sym_update_crc(symname + strlen(CRC_PFX), mod, crc, 521 export); 522 } 523 break; 524 case SHN_UNDEF: 525 /* undefined symbol */ 526 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && 527 ELF_ST_BIND(sym->st_info) != STB_WEAK) 528 break; 529 if (ignore_undef_symbol(info, symname)) 530 break; 531 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ 532 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) 533 /* add compatibility with older glibc */ 534 #ifndef STT_SPARC_REGISTER 535 #define STT_SPARC_REGISTER STT_REGISTER 536 #endif 537 if (info->hdr->e_machine == EM_SPARC || 538 info->hdr->e_machine == EM_SPARCV9) { 539 /* Ignore register directives. */ 540 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) 541 break; 542 if (symname[0] == '.') { 543 char *munged = strdup(symname); 544 munged[0] = '_'; 545 munged[1] = toupper(munged[1]); 546 symname = munged; 547 } 548 } 549 #endif 550 551 if (memcmp(symname, MODULE_SYMBOL_PREFIX, 552 strlen(MODULE_SYMBOL_PREFIX)) == 0) { 553 mod->unres = 554 alloc_symbol(symname + 555 strlen(MODULE_SYMBOL_PREFIX), 556 ELF_ST_BIND(sym->st_info) == STB_WEAK, 557 mod->unres); 558 } 559 break; 560 default: 561 /* All exported symbols */ 562 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { 563 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, 564 export); 565 } 566 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) 567 mod->has_init = 1; 568 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) 569 mod->has_cleanup = 1; 570 break; 571 } 572 } 573 574 /** 575 * Parse tag=value strings from .modinfo section 576 **/ 577 static char *next_string(char *string, unsigned long *secsize) 578 { 579 /* Skip non-zero chars */ 580 while (string[0]) { 581 string++; 582 if ((*secsize)-- <= 1) 583 return NULL; 584 } 585 586 /* Skip any zero padding. */ 587 while (!string[0]) { 588 string++; 589 if ((*secsize)-- <= 1) 590 return NULL; 591 } 592 return string; 593 } 594 595 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, 596 const char *tag, char *info) 597 { 598 char *p; 599 unsigned int taglen = strlen(tag); 600 unsigned long size = modinfo_len; 601 602 if (info) { 603 size -= info - (char *)modinfo; 604 modinfo = next_string(info, &size); 605 } 606 607 for (p = modinfo; p; p = next_string(p, &size)) { 608 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') 609 return p + taglen + 1; 610 } 611 return NULL; 612 } 613 614 static char *get_modinfo(void *modinfo, unsigned long modinfo_len, 615 const char *tag) 616 617 { 618 return get_next_modinfo(modinfo, modinfo_len, tag, NULL); 619 } 620 621 /** 622 * Test if string s ends in string sub 623 * return 0 if match 624 **/ 625 static int strrcmp(const char *s, const char *sub) 626 { 627 int slen, sublen; 628 629 if (!s || !sub) 630 return 1; 631 632 slen = strlen(s); 633 sublen = strlen(sub); 634 635 if ((slen == 0) || (sublen == 0)) 636 return 1; 637 638 if (sublen > slen) 639 return 1; 640 641 return memcmp(s + slen - sublen, sub, sublen); 642 } 643 644 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) 645 { 646 if (sym) 647 return elf->strtab + sym->st_name; 648 else 649 return "(unknown)"; 650 } 651 652 static const char *sec_name(struct elf_info *elf, int shndx) 653 { 654 Elf_Shdr *sechdrs = elf->sechdrs; 655 return (void *)elf->hdr + 656 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + 657 sechdrs[shndx].sh_name; 658 } 659 660 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) 661 { 662 return (void *)elf->hdr + 663 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + 664 sechdr->sh_name; 665 } 666 667 /* if sym is empty or point to a string 668 * like ".[0-9]+" then return 1. 669 * This is the optional prefix added by ld to some sections 670 */ 671 static int number_prefix(const char *sym) 672 { 673 if (*sym++ == '\0') 674 return 1; 675 if (*sym != '.') 676 return 0; 677 do { 678 char c = *sym++; 679 if (c < '0' || c > '9') 680 return 0; 681 } while (*sym); 682 return 1; 683 } 684 685 /* The pattern is an array of simple patterns. 686 * "foo" will match an exact string equal to "foo" 687 * "*foo" will match a string that ends with "foo" 688 * "foo*" will match a string that begins with "foo" 689 * "foo$" will match a string equal to "foo" or "foo.1" 690 * where the '1' can be any number including several digits. 691 * The $ syntax is for sections where ld append a dot number 692 * to make section name unique. 693 */ 694 int match(const char *sym, const char * const pat[]) 695 { 696 const char *p; 697 while (*pat) { 698 p = *pat++; 699 const char *endp = p + strlen(p) - 1; 700 701 /* "*foo" */ 702 if (*p == '*') { 703 if (strrcmp(sym, p + 1) == 0) 704 return 1; 705 } 706 /* "foo*" */ 707 else if (*endp == '*') { 708 if (strncmp(sym, p, strlen(p) - 1) == 0) 709 return 1; 710 } 711 /* "foo$" */ 712 else if (*endp == '$') { 713 if (strncmp(sym, p, strlen(p) - 1) == 0) { 714 if (number_prefix(sym + strlen(p) - 1)) 715 return 1; 716 } 717 } 718 /* no wildcards */ 719 else { 720 if (strcmp(p, sym) == 0) 721 return 1; 722 } 723 } 724 /* no match */ 725 return 0; 726 } 727 728 /* sections that we do not want to do full section mismatch check on */ 729 static const char *section_white_list[] = 730 { 731 ".comment*", 732 ".debug*", 733 ".mdebug*", /* alpha, score, mips etc. */ 734 ".pdr", /* alpha, score, mips etc. */ 735 ".stab*", 736 ".note*", 737 ".got*", 738 ".toc*", 739 NULL 740 }; 741 742 /* 743 * This is used to find sections missing the SHF_ALLOC flag. 744 * The cause of this is often a section specified in assembler 745 * without "ax" / "aw". 746 */ 747 static void check_section(const char *modname, struct elf_info *elf, 748 Elf_Shdr *sechdr) 749 { 750 const char *sec = sech_name(elf, sechdr); 751 752 if (sechdr->sh_type == SHT_PROGBITS && 753 !(sechdr->sh_flags & SHF_ALLOC) && 754 !match(sec, section_white_list)) { 755 warn("%s (%s): unexpected non-allocatable section.\n" 756 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" 757 "Note that for example <linux/init.h> contains\n" 758 "section definitions for use in .S files.\n\n", 759 modname, sec); 760 } 761 } 762 763 764 765 #define ALL_INIT_DATA_SECTIONS \ 766 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" 767 #define ALL_EXIT_DATA_SECTIONS \ 768 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" 769 770 #define ALL_INIT_TEXT_SECTIONS \ 771 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" 772 #define ALL_EXIT_TEXT_SECTIONS \ 773 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" 774 775 #define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS 776 #define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS 777 778 #define DATA_SECTIONS ".data$", ".data.rel$" 779 #define TEXT_SECTIONS ".text$" 780 781 #define INIT_SECTIONS ".init.data$", ".init.text$" 782 #define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$" 783 #define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$" 784 #define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$" 785 786 #define EXIT_SECTIONS ".exit.data$", ".exit.text$" 787 #define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$" 788 #define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$" 789 #define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$" 790 791 /* init data sections */ 792 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; 793 794 /* all init sections */ 795 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; 796 797 /* All init and exit sections (code + data) */ 798 static const char *init_exit_sections[] = 799 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; 800 801 /* data section */ 802 static const char *data_sections[] = { DATA_SECTIONS, NULL }; 803 804 805 /* symbols in .data that may refer to init/exit sections */ 806 static const char *symbol_white_list[] = 807 { 808 "*driver", 809 "*_template", /* scsi uses *_template a lot */ 810 "*_timer", /* arm uses ops structures named _timer a lot */ 811 "*_sht", /* scsi also used *_sht to some extent */ 812 "*_ops", 813 "*_probe", 814 "*_probe_one", 815 "*_console", 816 NULL 817 }; 818 819 static const char *head_sections[] = { ".head.text*", NULL }; 820 static const char *linker_symbols[] = 821 { "__init_begin", "_sinittext", "_einittext", NULL }; 822 823 enum mismatch { 824 NO_MISMATCH, 825 TEXT_TO_INIT, 826 DATA_TO_INIT, 827 TEXT_TO_EXIT, 828 DATA_TO_EXIT, 829 XXXINIT_TO_INIT, 830 XXXEXIT_TO_EXIT, 831 INIT_TO_EXIT, 832 EXIT_TO_INIT, 833 EXPORT_TO_INIT_EXIT, 834 }; 835 836 struct sectioncheck { 837 const char *fromsec[20]; 838 const char *tosec[20]; 839 enum mismatch mismatch; 840 }; 841 842 const struct sectioncheck sectioncheck[] = { 843 /* Do not reference init/exit code/data from 844 * normal code and data 845 */ 846 { 847 .fromsec = { TEXT_SECTIONS, NULL }, 848 .tosec = { ALL_INIT_SECTIONS, NULL }, 849 .mismatch = TEXT_TO_INIT, 850 }, 851 { 852 .fromsec = { DATA_SECTIONS, NULL }, 853 .tosec = { ALL_INIT_SECTIONS, NULL }, 854 .mismatch = DATA_TO_INIT, 855 }, 856 { 857 .fromsec = { TEXT_SECTIONS, NULL }, 858 .tosec = { ALL_EXIT_SECTIONS, NULL }, 859 .mismatch = TEXT_TO_EXIT, 860 }, 861 { 862 .fromsec = { DATA_SECTIONS, NULL }, 863 .tosec = { ALL_EXIT_SECTIONS, NULL }, 864 .mismatch = DATA_TO_EXIT, 865 }, 866 /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ 867 { 868 .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL }, 869 .tosec = { INIT_SECTIONS, NULL }, 870 .mismatch = XXXINIT_TO_INIT, 871 }, 872 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ 873 { 874 .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL }, 875 .tosec = { EXIT_SECTIONS, NULL }, 876 .mismatch = XXXEXIT_TO_EXIT, 877 }, 878 /* Do not use exit code/data from init code */ 879 { 880 .fromsec = { ALL_INIT_SECTIONS, NULL }, 881 .tosec = { ALL_EXIT_SECTIONS, NULL }, 882 .mismatch = INIT_TO_EXIT, 883 }, 884 /* Do not use init code/data from exit code */ 885 { 886 .fromsec = { ALL_EXIT_SECTIONS, NULL }, 887 .tosec = { ALL_INIT_SECTIONS, NULL }, 888 .mismatch = EXIT_TO_INIT, 889 }, 890 /* Do not export init/exit functions or data */ 891 { 892 .fromsec = { "__ksymtab*", NULL }, 893 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, 894 .mismatch = EXPORT_TO_INIT_EXIT 895 } 896 }; 897 898 static int section_mismatch(const char *fromsec, const char *tosec) 899 { 900 int i; 901 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); 902 const struct sectioncheck *check = §ioncheck[0]; 903 904 for (i = 0; i < elems; i++) { 905 if (match(fromsec, check->fromsec) && 906 match(tosec, check->tosec)) 907 return check->mismatch; 908 check++; 909 } 910 return NO_MISMATCH; 911 } 912 913 /** 914 * Whitelist to allow certain references to pass with no warning. 915 * 916 * Pattern 1: 917 * If a module parameter is declared __initdata and permissions=0 918 * then this is legal despite the warning generated. 919 * We cannot see value of permissions here, so just ignore 920 * this pattern. 921 * The pattern is identified by: 922 * tosec = .init.data 923 * fromsec = .data* 924 * atsym =__param* 925 * 926 * Pattern 2: 927 * Many drivers utilise a *driver container with references to 928 * add, remove, probe functions etc. 929 * These functions may often be marked __init and we do not want to 930 * warn here. 931 * the pattern is identified by: 932 * tosec = init or exit section 933 * fromsec = data section 934 * atsym = *driver, *_template, *_sht, *_ops, *_probe, 935 * *probe_one, *_console, *_timer 936 * 937 * Pattern 3: 938 * Whitelist all references from .head.text to any init section 939 * 940 * Pattern 4: 941 * Some symbols belong to init section but still it is ok to reference 942 * these from non-init sections as these symbols don't have any memory 943 * allocated for them and symbol address and value are same. So even 944 * if init section is freed, its ok to reference those symbols. 945 * For ex. symbols marking the init section boundaries. 946 * This pattern is identified by 947 * refsymname = __init_begin, _sinittext, _einittext 948 * 949 **/ 950 static int secref_whitelist(const char *fromsec, const char *fromsym, 951 const char *tosec, const char *tosym) 952 { 953 /* Check for pattern 1 */ 954 if (match(tosec, init_data_sections) && 955 match(fromsec, data_sections) && 956 (strncmp(fromsym, "__param", strlen("__param")) == 0)) 957 return 0; 958 959 /* Check for pattern 2 */ 960 if (match(tosec, init_exit_sections) && 961 match(fromsec, data_sections) && 962 match(fromsym, symbol_white_list)) 963 return 0; 964 965 /* Check for pattern 3 */ 966 if (match(fromsec, head_sections) && 967 match(tosec, init_sections)) 968 return 0; 969 970 /* Check for pattern 4 */ 971 if (match(tosym, linker_symbols)) 972 return 0; 973 974 return 1; 975 } 976 977 /** 978 * Find symbol based on relocation record info. 979 * In some cases the symbol supplied is a valid symbol so 980 * return refsym. If st_name != 0 we assume this is a valid symbol. 981 * In other cases the symbol needs to be looked up in the symbol table 982 * based on section and address. 983 * **/ 984 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, 985 Elf_Sym *relsym) 986 { 987 Elf_Sym *sym; 988 Elf_Sym *near = NULL; 989 Elf64_Sword distance = 20; 990 Elf64_Sword d; 991 992 if (relsym->st_name != 0) 993 return relsym; 994 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { 995 if (sym->st_shndx != relsym->st_shndx) 996 continue; 997 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) 998 continue; 999 if (sym->st_value == addr) 1000 return sym; 1001 /* Find a symbol nearby - addr are maybe negative */ 1002 d = sym->st_value - addr; 1003 if (d < 0) 1004 d = addr - sym->st_value; 1005 if (d < distance) { 1006 distance = d; 1007 near = sym; 1008 } 1009 } 1010 /* We need a close match */ 1011 if (distance < 20) 1012 return near; 1013 else 1014 return NULL; 1015 } 1016 1017 static inline int is_arm_mapping_symbol(const char *str) 1018 { 1019 return str[0] == '$' && strchr("atd", str[1]) 1020 && (str[2] == '\0' || str[2] == '.'); 1021 } 1022 1023 /* 1024 * If there's no name there, ignore it; likewise, ignore it if it's 1025 * one of the magic symbols emitted used by current ARM tools. 1026 * 1027 * Otherwise if find_symbols_between() returns those symbols, they'll 1028 * fail the whitelist tests and cause lots of false alarms ... fixable 1029 * only by merging __exit and __init sections into __text, bloating 1030 * the kernel (which is especially evil on embedded platforms). 1031 */ 1032 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) 1033 { 1034 const char *name = elf->strtab + sym->st_name; 1035 1036 if (!name || !strlen(name)) 1037 return 0; 1038 return !is_arm_mapping_symbol(name); 1039 } 1040 1041 /* 1042 * Find symbols before or equal addr and after addr - in the section sec. 1043 * If we find two symbols with equal offset prefer one with a valid name. 1044 * The ELF format may have a better way to detect what type of symbol 1045 * it is, but this works for now. 1046 **/ 1047 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, 1048 const char *sec) 1049 { 1050 Elf_Sym *sym; 1051 Elf_Sym *near = NULL; 1052 Elf_Addr distance = ~0; 1053 1054 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { 1055 const char *symsec; 1056 1057 if (sym->st_shndx >= SHN_LORESERVE) 1058 continue; 1059 symsec = sec_name(elf, sym->st_shndx); 1060 if (strcmp(symsec, sec) != 0) 1061 continue; 1062 if (!is_valid_name(elf, sym)) 1063 continue; 1064 if (sym->st_value <= addr) { 1065 if ((addr - sym->st_value) < distance) { 1066 distance = addr - sym->st_value; 1067 near = sym; 1068 } else if ((addr - sym->st_value) == distance) { 1069 near = sym; 1070 } 1071 } 1072 } 1073 return near; 1074 } 1075 1076 /* 1077 * Convert a section name to the function/data attribute 1078 * .init.text => __init 1079 * .cpuinit.data => __cpudata 1080 * .memexitconst => __memconst 1081 * etc. 1082 */ 1083 static char *sec2annotation(const char *s) 1084 { 1085 if (match(s, init_exit_sections)) { 1086 char *p = malloc(20); 1087 char *r = p; 1088 1089 *p++ = '_'; 1090 *p++ = '_'; 1091 if (*s == '.') 1092 s++; 1093 while (*s && *s != '.') 1094 *p++ = *s++; 1095 *p = '\0'; 1096 if (*s == '.') 1097 s++; 1098 if (strstr(s, "rodata") != NULL) 1099 strcat(p, "const "); 1100 else if (strstr(s, "data") != NULL) 1101 strcat(p, "data "); 1102 else 1103 strcat(p, " "); 1104 return r; /* we leak her but we do not care */ 1105 } else { 1106 return ""; 1107 } 1108 } 1109 1110 static int is_function(Elf_Sym *sym) 1111 { 1112 if (sym) 1113 return ELF_ST_TYPE(sym->st_info) == STT_FUNC; 1114 else 1115 return -1; 1116 } 1117 1118 /* 1119 * Print a warning about a section mismatch. 1120 * Try to find symbols near it so user can find it. 1121 * Check whitelist before warning - it may be a false positive. 1122 */ 1123 static void report_sec_mismatch(const char *modname, enum mismatch mismatch, 1124 const char *fromsec, 1125 unsigned long long fromaddr, 1126 const char *fromsym, 1127 int from_is_func, 1128 const char *tosec, const char *tosym, 1129 int to_is_func) 1130 { 1131 const char *from, *from_p; 1132 const char *to, *to_p; 1133 1134 switch (from_is_func) { 1135 case 0: from = "variable"; from_p = ""; break; 1136 case 1: from = "function"; from_p = "()"; break; 1137 default: from = "(unknown reference)"; from_p = ""; break; 1138 } 1139 switch (to_is_func) { 1140 case 0: to = "variable"; to_p = ""; break; 1141 case 1: to = "function"; to_p = "()"; break; 1142 default: to = "(unknown reference)"; to_p = ""; break; 1143 } 1144 1145 sec_mismatch_count++; 1146 if (!sec_mismatch_verbose) 1147 return; 1148 1149 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " 1150 "to the %s %s:%s%s\n", 1151 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, 1152 tosym, to_p); 1153 1154 switch (mismatch) { 1155 case TEXT_TO_INIT: 1156 fprintf(stderr, 1157 "The function %s%s() references\n" 1158 "the %s %s%s%s.\n" 1159 "This is often because %s lacks a %s\n" 1160 "annotation or the annotation of %s is wrong.\n", 1161 sec2annotation(fromsec), fromsym, 1162 to, sec2annotation(tosec), tosym, to_p, 1163 fromsym, sec2annotation(tosec), tosym); 1164 break; 1165 case DATA_TO_INIT: { 1166 const char **s = symbol_white_list; 1167 fprintf(stderr, 1168 "The variable %s references\n" 1169 "the %s %s%s%s\n" 1170 "If the reference is valid then annotate the\n" 1171 "variable with __init* (see linux/init.h) " 1172 "or name the variable:\n", 1173 fromsym, to, sec2annotation(tosec), tosym, to_p); 1174 while (*s) 1175 fprintf(stderr, "%s, ", *s++); 1176 fprintf(stderr, "\n"); 1177 break; 1178 } 1179 case TEXT_TO_EXIT: 1180 fprintf(stderr, 1181 "The function %s() references a %s in an exit section.\n" 1182 "Often the %s %s%s has valid usage outside the exit section\n" 1183 "and the fix is to remove the %sannotation of %s.\n", 1184 fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym); 1185 break; 1186 case DATA_TO_EXIT: { 1187 const char **s = symbol_white_list; 1188 fprintf(stderr, 1189 "The variable %s references\n" 1190 "the %s %s%s%s\n" 1191 "If the reference is valid then annotate the\n" 1192 "variable with __exit* (see linux/init.h) or " 1193 "name the variable:\n", 1194 fromsym, to, sec2annotation(tosec), tosym, to_p); 1195 while (*s) 1196 fprintf(stderr, "%s, ", *s++); 1197 fprintf(stderr, "\n"); 1198 break; 1199 } 1200 case XXXINIT_TO_INIT: 1201 case XXXEXIT_TO_EXIT: 1202 fprintf(stderr, 1203 "The %s %s%s%s references\n" 1204 "a %s %s%s%s.\n" 1205 "If %s is only used by %s then\n" 1206 "annotate %s with a matching annotation.\n", 1207 from, sec2annotation(fromsec), fromsym, from_p, 1208 to, sec2annotation(tosec), tosym, to_p, 1209 tosym, fromsym, tosym); 1210 break; 1211 case INIT_TO_EXIT: 1212 fprintf(stderr, 1213 "The %s %s%s%s references\n" 1214 "a %s %s%s%s.\n" 1215 "This is often seen when error handling " 1216 "in the init function\n" 1217 "uses functionality in the exit path.\n" 1218 "The fix is often to remove the %sannotation of\n" 1219 "%s%s so it may be used outside an exit section.\n", 1220 from, sec2annotation(fromsec), fromsym, from_p, 1221 to, sec2annotation(tosec), tosym, to_p, 1222 sec2annotation(tosec), tosym, to_p); 1223 break; 1224 case EXIT_TO_INIT: 1225 fprintf(stderr, 1226 "The %s %s%s%s references\n" 1227 "a %s %s%s%s.\n" 1228 "This is often seen when error handling " 1229 "in the exit function\n" 1230 "uses functionality in the init path.\n" 1231 "The fix is often to remove the %sannotation of\n" 1232 "%s%s so it may be used outside an init section.\n", 1233 from, sec2annotation(fromsec), fromsym, from_p, 1234 to, sec2annotation(tosec), tosym, to_p, 1235 sec2annotation(tosec), tosym, to_p); 1236 break; 1237 case EXPORT_TO_INIT_EXIT: 1238 fprintf(stderr, 1239 "The symbol %s is exported and annotated %s\n" 1240 "Fix this by removing the %sannotation of %s " 1241 "or drop the export.\n", 1242 tosym, sec2annotation(tosec), sec2annotation(tosec), tosym); 1243 case NO_MISMATCH: 1244 /* To get warnings on missing members */ 1245 break; 1246 } 1247 fprintf(stderr, "\n"); 1248 } 1249 1250 static void check_section_mismatch(const char *modname, struct elf_info *elf, 1251 Elf_Rela *r, Elf_Sym *sym, const char *fromsec) 1252 { 1253 const char *tosec; 1254 enum mismatch mismatch; 1255 1256 tosec = sec_name(elf, sym->st_shndx); 1257 mismatch = section_mismatch(fromsec, tosec); 1258 if (mismatch != NO_MISMATCH) { 1259 Elf_Sym *to; 1260 Elf_Sym *from; 1261 const char *tosym; 1262 const char *fromsym; 1263 1264 from = find_elf_symbol2(elf, r->r_offset, fromsec); 1265 fromsym = sym_name(elf, from); 1266 to = find_elf_symbol(elf, r->r_addend, sym); 1267 tosym = sym_name(elf, to); 1268 1269 /* check whitelist - we may ignore it */ 1270 if (secref_whitelist(fromsec, fromsym, tosec, tosym)) { 1271 report_sec_mismatch(modname, mismatch, 1272 fromsec, r->r_offset, fromsym, 1273 is_function(from), tosec, tosym, 1274 is_function(to)); 1275 } 1276 } 1277 } 1278 1279 static unsigned int *reloc_location(struct elf_info *elf, 1280 Elf_Shdr *sechdr, Elf_Rela *r) 1281 { 1282 Elf_Shdr *sechdrs = elf->sechdrs; 1283 int section = sechdr->sh_info; 1284 1285 return (void *)elf->hdr + sechdrs[section].sh_offset + 1286 (r->r_offset - sechdrs[section].sh_addr); 1287 } 1288 1289 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) 1290 { 1291 unsigned int r_typ = ELF_R_TYPE(r->r_info); 1292 unsigned int *location = reloc_location(elf, sechdr, r); 1293 1294 switch (r_typ) { 1295 case R_386_32: 1296 r->r_addend = TO_NATIVE(*location); 1297 break; 1298 case R_386_PC32: 1299 r->r_addend = TO_NATIVE(*location) + 4; 1300 /* For CONFIG_RELOCATABLE=y */ 1301 if (elf->hdr->e_type == ET_EXEC) 1302 r->r_addend += r->r_offset; 1303 break; 1304 } 1305 return 0; 1306 } 1307 1308 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) 1309 { 1310 unsigned int r_typ = ELF_R_TYPE(r->r_info); 1311 1312 switch (r_typ) { 1313 case R_ARM_ABS32: 1314 /* From ARM ABI: (S + A) | T */ 1315 r->r_addend = (int)(long) 1316 (elf->symtab_start + ELF_R_SYM(r->r_info)); 1317 break; 1318 case R_ARM_PC24: 1319 /* From ARM ABI: ((S + A) | T) - P */ 1320 r->r_addend = (int)(long)(elf->hdr + 1321 sechdr->sh_offset + 1322 (r->r_offset - sechdr->sh_addr)); 1323 break; 1324 default: 1325 return 1; 1326 } 1327 return 0; 1328 } 1329 1330 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) 1331 { 1332 unsigned int r_typ = ELF_R_TYPE(r->r_info); 1333 unsigned int *location = reloc_location(elf, sechdr, r); 1334 unsigned int inst; 1335 1336 if (r_typ == R_MIPS_HI16) 1337 return 1; /* skip this */ 1338 inst = TO_NATIVE(*location); 1339 switch (r_typ) { 1340 case R_MIPS_LO16: 1341 r->r_addend = inst & 0xffff; 1342 break; 1343 case R_MIPS_26: 1344 r->r_addend = (inst & 0x03ffffff) << 2; 1345 break; 1346 case R_MIPS_32: 1347 r->r_addend = inst; 1348 break; 1349 } 1350 return 0; 1351 } 1352 1353 static void section_rela(const char *modname, struct elf_info *elf, 1354 Elf_Shdr *sechdr) 1355 { 1356 Elf_Sym *sym; 1357 Elf_Rela *rela; 1358 Elf_Rela r; 1359 unsigned int r_sym; 1360 const char *fromsec; 1361 1362 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; 1363 Elf_Rela *stop = (void *)start + sechdr->sh_size; 1364 1365 fromsec = sech_name(elf, sechdr); 1366 fromsec += strlen(".rela"); 1367 /* if from section (name) is know good then skip it */ 1368 if (match(fromsec, section_white_list)) 1369 return; 1370 1371 for (rela = start; rela < stop; rela++) { 1372 r.r_offset = TO_NATIVE(rela->r_offset); 1373 #if KERNEL_ELFCLASS == ELFCLASS64 1374 if (elf->hdr->e_machine == EM_MIPS) { 1375 unsigned int r_typ; 1376 r_sym = ELF64_MIPS_R_SYM(rela->r_info); 1377 r_sym = TO_NATIVE(r_sym); 1378 r_typ = ELF64_MIPS_R_TYPE(rela->r_info); 1379 r.r_info = ELF64_R_INFO(r_sym, r_typ); 1380 } else { 1381 r.r_info = TO_NATIVE(rela->r_info); 1382 r_sym = ELF_R_SYM(r.r_info); 1383 } 1384 #else 1385 r.r_info = TO_NATIVE(rela->r_info); 1386 r_sym = ELF_R_SYM(r.r_info); 1387 #endif 1388 r.r_addend = TO_NATIVE(rela->r_addend); 1389 sym = elf->symtab_start + r_sym; 1390 /* Skip special sections */ 1391 if (sym->st_shndx >= SHN_LORESERVE) 1392 continue; 1393 check_section_mismatch(modname, elf, &r, sym, fromsec); 1394 } 1395 } 1396 1397 static void section_rel(const char *modname, struct elf_info *elf, 1398 Elf_Shdr *sechdr) 1399 { 1400 Elf_Sym *sym; 1401 Elf_Rel *rel; 1402 Elf_Rela r; 1403 unsigned int r_sym; 1404 const char *fromsec; 1405 1406 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; 1407 Elf_Rel *stop = (void *)start + sechdr->sh_size; 1408 1409 fromsec = sech_name(elf, sechdr); 1410 fromsec += strlen(".rel"); 1411 /* if from section (name) is know good then skip it */ 1412 if (match(fromsec, section_white_list)) 1413 return; 1414 1415 for (rel = start; rel < stop; rel++) { 1416 r.r_offset = TO_NATIVE(rel->r_offset); 1417 #if KERNEL_ELFCLASS == ELFCLASS64 1418 if (elf->hdr->e_machine == EM_MIPS) { 1419 unsigned int r_typ; 1420 r_sym = ELF64_MIPS_R_SYM(rel->r_info); 1421 r_sym = TO_NATIVE(r_sym); 1422 r_typ = ELF64_MIPS_R_TYPE(rel->r_info); 1423 r.r_info = ELF64_R_INFO(r_sym, r_typ); 1424 } else { 1425 r.r_info = TO_NATIVE(rel->r_info); 1426 r_sym = ELF_R_SYM(r.r_info); 1427 } 1428 #else 1429 r.r_info = TO_NATIVE(rel->r_info); 1430 r_sym = ELF_R_SYM(r.r_info); 1431 #endif 1432 r.r_addend = 0; 1433 switch (elf->hdr->e_machine) { 1434 case EM_386: 1435 if (addend_386_rel(elf, sechdr, &r)) 1436 continue; 1437 break; 1438 case EM_ARM: 1439 if (addend_arm_rel(elf, sechdr, &r)) 1440 continue; 1441 break; 1442 case EM_MIPS: 1443 if (addend_mips_rel(elf, sechdr, &r)) 1444 continue; 1445 break; 1446 } 1447 sym = elf->symtab_start + r_sym; 1448 /* Skip special sections */ 1449 if (sym->st_shndx >= SHN_LORESERVE) 1450 continue; 1451 check_section_mismatch(modname, elf, &r, sym, fromsec); 1452 } 1453 } 1454 1455 /** 1456 * A module includes a number of sections that are discarded 1457 * either when loaded or when used as built-in. 1458 * For loaded modules all functions marked __init and all data 1459 * marked __initdata will be discarded when the module has been intialized. 1460 * Likewise for modules used built-in the sections marked __exit 1461 * are discarded because __exit marked function are supposed to be called 1462 * only when a module is unloaded which never happens for built-in modules. 1463 * The check_sec_ref() function traverses all relocation records 1464 * to find all references to a section that reference a section that will 1465 * be discarded and warns about it. 1466 **/ 1467 static void check_sec_ref(struct module *mod, const char *modname, 1468 struct elf_info *elf) 1469 { 1470 int i; 1471 Elf_Shdr *sechdrs = elf->sechdrs; 1472 1473 /* Walk through all sections */ 1474 for (i = 0; i < elf->hdr->e_shnum; i++) { 1475 check_section(modname, elf, &elf->sechdrs[i]); 1476 /* We want to process only relocation sections and not .init */ 1477 if (sechdrs[i].sh_type == SHT_RELA) 1478 section_rela(modname, elf, &elf->sechdrs[i]); 1479 else if (sechdrs[i].sh_type == SHT_REL) 1480 section_rel(modname, elf, &elf->sechdrs[i]); 1481 } 1482 } 1483 1484 static void get_markers(struct elf_info *info, struct module *mod) 1485 { 1486 const Elf_Shdr *sh = &info->sechdrs[info->markers_strings_sec]; 1487 const char *strings = (const char *) info->hdr + sh->sh_offset; 1488 const Elf_Sym *sym, *first_sym, *last_sym; 1489 size_t n; 1490 1491 if (!info->markers_strings_sec) 1492 return; 1493 1494 /* 1495 * First count the strings. We look for all the symbols defined 1496 * in the __markers_strings section named __mstrtab_*. For 1497 * these local names, the compiler puts a random .NNN suffix on, 1498 * so the names don't correspond exactly. 1499 */ 1500 first_sym = last_sym = NULL; 1501 n = 0; 1502 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) 1503 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT && 1504 sym->st_shndx == info->markers_strings_sec && 1505 !strncmp(info->strtab + sym->st_name, 1506 "__mstrtab_", sizeof "__mstrtab_" - 1)) { 1507 if (first_sym == NULL) 1508 first_sym = sym; 1509 last_sym = sym; 1510 ++n; 1511 } 1512 1513 if (n == 0) 1514 return; 1515 1516 /* 1517 * Now collect each name and format into a line for the output. 1518 * Lines look like: 1519 * marker_name vmlinux marker %s format %d 1520 * The format string after the second \t can use whitespace. 1521 */ 1522 mod->markers = NOFAIL(malloc(sizeof mod->markers[0] * n)); 1523 mod->nmarkers = n; 1524 1525 n = 0; 1526 for (sym = first_sym; sym <= last_sym; sym++) 1527 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT && 1528 sym->st_shndx == info->markers_strings_sec && 1529 !strncmp(info->strtab + sym->st_name, 1530 "__mstrtab_", sizeof "__mstrtab_" - 1)) { 1531 const char *name = strings + sym->st_value; 1532 const char *fmt = strchr(name, '\0') + 1; 1533 char *line = NULL; 1534 asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt); 1535 NOFAIL(line); 1536 mod->markers[n++] = line; 1537 } 1538 } 1539 1540 static void read_symbols(char *modname) 1541 { 1542 const char *symname; 1543 char *version; 1544 char *license; 1545 struct module *mod; 1546 struct elf_info info = { }; 1547 Elf_Sym *sym; 1548 1549 if (!parse_elf(&info, modname)) 1550 return; 1551 1552 mod = new_module(modname); 1553 1554 /* When there's no vmlinux, don't print warnings about 1555 * unresolved symbols (since there'll be too many ;) */ 1556 if (is_vmlinux(modname)) { 1557 have_vmlinux = 1; 1558 mod->skip = 1; 1559 } 1560 1561 license = get_modinfo(info.modinfo, info.modinfo_len, "license"); 1562 if (info.modinfo && !license && !is_vmlinux(modname)) 1563 warn("modpost: missing MODULE_LICENSE() in %s\n" 1564 "see include/linux/module.h for " 1565 "more information\n", modname); 1566 while (license) { 1567 if (license_is_gpl_compatible(license)) 1568 mod->gpl_compatible = 1; 1569 else { 1570 mod->gpl_compatible = 0; 1571 break; 1572 } 1573 license = get_next_modinfo(info.modinfo, info.modinfo_len, 1574 "license", license); 1575 } 1576 1577 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { 1578 symname = info.strtab + sym->st_name; 1579 1580 handle_modversions(mod, &info, sym, symname); 1581 handle_moddevtable(mod, &info, sym, symname); 1582 } 1583 if (!is_vmlinux(modname) || 1584 (is_vmlinux(modname) && vmlinux_section_warnings)) 1585 check_sec_ref(mod, modname, &info); 1586 1587 version = get_modinfo(info.modinfo, info.modinfo_len, "version"); 1588 if (version) 1589 maybe_frob_rcs_version(modname, version, info.modinfo, 1590 version - (char *)info.hdr); 1591 if (version || (all_versions && !is_vmlinux(modname))) 1592 get_src_version(modname, mod->srcversion, 1593 sizeof(mod->srcversion)-1); 1594 1595 get_markers(&info, mod); 1596 1597 parse_elf_finish(&info); 1598 1599 /* Our trick to get versioning for module struct etc. - it's 1600 * never passed as an argument to an exported function, so 1601 * the automatic versioning doesn't pick it up, but it's really 1602 * important anyhow */ 1603 if (modversions) 1604 mod->unres = alloc_symbol("module_layout", 0, mod->unres); 1605 } 1606 1607 #define SZ 500 1608 1609 /* We first write the generated file into memory using the 1610 * following helper, then compare to the file on disk and 1611 * only update the later if anything changed */ 1612 1613 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, 1614 const char *fmt, ...) 1615 { 1616 char tmp[SZ]; 1617 int len; 1618 va_list ap; 1619 1620 va_start(ap, fmt); 1621 len = vsnprintf(tmp, SZ, fmt, ap); 1622 buf_write(buf, tmp, len); 1623 va_end(ap); 1624 } 1625 1626 void buf_write(struct buffer *buf, const char *s, int len) 1627 { 1628 if (buf->size - buf->pos < len) { 1629 buf->size += len + SZ; 1630 buf->p = realloc(buf->p, buf->size); 1631 } 1632 strncpy(buf->p + buf->pos, s, len); 1633 buf->pos += len; 1634 } 1635 1636 static void check_for_gpl_usage(enum export exp, const char *m, const char *s) 1637 { 1638 const char *e = is_vmlinux(m) ?"":".ko"; 1639 1640 switch (exp) { 1641 case export_gpl: 1642 fatal("modpost: GPL-incompatible module %s%s " 1643 "uses GPL-only symbol '%s'\n", m, e, s); 1644 break; 1645 case export_unused_gpl: 1646 fatal("modpost: GPL-incompatible module %s%s " 1647 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); 1648 break; 1649 case export_gpl_future: 1650 warn("modpost: GPL-incompatible module %s%s " 1651 "uses future GPL-only symbol '%s'\n", m, e, s); 1652 break; 1653 case export_plain: 1654 case export_unused: 1655 case export_unknown: 1656 /* ignore */ 1657 break; 1658 } 1659 } 1660 1661 static void check_for_unused(enum export exp, const char *m, const char *s) 1662 { 1663 const char *e = is_vmlinux(m) ?"":".ko"; 1664 1665 switch (exp) { 1666 case export_unused: 1667 case export_unused_gpl: 1668 warn("modpost: module %s%s " 1669 "uses symbol '%s' marked UNUSED\n", m, e, s); 1670 break; 1671 default: 1672 /* ignore */ 1673 break; 1674 } 1675 } 1676 1677 static void check_exports(struct module *mod) 1678 { 1679 struct symbol *s, *exp; 1680 1681 for (s = mod->unres; s; s = s->next) { 1682 const char *basename; 1683 exp = find_symbol(s->name); 1684 if (!exp || exp->module == mod) 1685 continue; 1686 basename = strrchr(mod->name, '/'); 1687 if (basename) 1688 basename++; 1689 else 1690 basename = mod->name; 1691 if (!mod->gpl_compatible) 1692 check_for_gpl_usage(exp->export, basename, exp->name); 1693 check_for_unused(exp->export, basename, exp->name); 1694 } 1695 } 1696 1697 /** 1698 * Header for the generated file 1699 **/ 1700 static void add_header(struct buffer *b, struct module *mod) 1701 { 1702 buf_printf(b, "#include <linux/module.h>\n"); 1703 buf_printf(b, "#include <linux/vermagic.h>\n"); 1704 buf_printf(b, "#include <linux/compiler.h>\n"); 1705 buf_printf(b, "\n"); 1706 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); 1707 buf_printf(b, "\n"); 1708 buf_printf(b, "struct module __this_module\n"); 1709 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); 1710 buf_printf(b, " .name = KBUILD_MODNAME,\n"); 1711 if (mod->has_init) 1712 buf_printf(b, " .init = init_module,\n"); 1713 if (mod->has_cleanup) 1714 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" 1715 " .exit = cleanup_module,\n" 1716 "#endif\n"); 1717 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); 1718 buf_printf(b, "};\n"); 1719 } 1720 1721 void add_staging_flag(struct buffer *b, const char *name) 1722 { 1723 static const char *staging_dir = "drivers/staging"; 1724 1725 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) 1726 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); 1727 } 1728 1729 /** 1730 * Record CRCs for unresolved symbols 1731 **/ 1732 static int add_versions(struct buffer *b, struct module *mod) 1733 { 1734 struct symbol *s, *exp; 1735 int err = 0; 1736 1737 for (s = mod->unres; s; s = s->next) { 1738 exp = find_symbol(s->name); 1739 if (!exp || exp->module == mod) { 1740 if (have_vmlinux && !s->weak) { 1741 if (warn_unresolved) { 1742 warn("\"%s\" [%s.ko] undefined!\n", 1743 s->name, mod->name); 1744 } else { 1745 merror("\"%s\" [%s.ko] undefined!\n", 1746 s->name, mod->name); 1747 err = 1; 1748 } 1749 } 1750 continue; 1751 } 1752 s->module = exp->module; 1753 s->crc_valid = exp->crc_valid; 1754 s->crc = exp->crc; 1755 } 1756 1757 if (!modversions) 1758 return err; 1759 1760 buf_printf(b, "\n"); 1761 buf_printf(b, "static const struct modversion_info ____versions[]\n"); 1762 buf_printf(b, "__used\n"); 1763 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); 1764 1765 for (s = mod->unres; s; s = s->next) { 1766 if (!s->module) 1767 continue; 1768 if (!s->crc_valid) { 1769 warn("\"%s\" [%s.ko] has no CRC!\n", 1770 s->name, mod->name); 1771 continue; 1772 } 1773 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); 1774 } 1775 1776 buf_printf(b, "};\n"); 1777 1778 return err; 1779 } 1780 1781 static void add_depends(struct buffer *b, struct module *mod, 1782 struct module *modules) 1783 { 1784 struct symbol *s; 1785 struct module *m; 1786 int first = 1; 1787 1788 for (m = modules; m; m = m->next) 1789 m->seen = is_vmlinux(m->name); 1790 1791 buf_printf(b, "\n"); 1792 buf_printf(b, "static const char __module_depends[]\n"); 1793 buf_printf(b, "__used\n"); 1794 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); 1795 buf_printf(b, "\"depends="); 1796 for (s = mod->unres; s; s = s->next) { 1797 const char *p; 1798 if (!s->module) 1799 continue; 1800 1801 if (s->module->seen) 1802 continue; 1803 1804 s->module->seen = 1; 1805 p = strrchr(s->module->name, '/'); 1806 if (p) 1807 p++; 1808 else 1809 p = s->module->name; 1810 buf_printf(b, "%s%s", first ? "" : ",", p); 1811 first = 0; 1812 } 1813 buf_printf(b, "\";\n"); 1814 } 1815 1816 static void add_srcversion(struct buffer *b, struct module *mod) 1817 { 1818 if (mod->srcversion[0]) { 1819 buf_printf(b, "\n"); 1820 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", 1821 mod->srcversion); 1822 } 1823 } 1824 1825 static void write_if_changed(struct buffer *b, const char *fname) 1826 { 1827 char *tmp; 1828 FILE *file; 1829 struct stat st; 1830 1831 file = fopen(fname, "r"); 1832 if (!file) 1833 goto write; 1834 1835 if (fstat(fileno(file), &st) < 0) 1836 goto close_write; 1837 1838 if (st.st_size != b->pos) 1839 goto close_write; 1840 1841 tmp = NOFAIL(malloc(b->pos)); 1842 if (fread(tmp, 1, b->pos, file) != b->pos) 1843 goto free_write; 1844 1845 if (memcmp(tmp, b->p, b->pos) != 0) 1846 goto free_write; 1847 1848 free(tmp); 1849 fclose(file); 1850 return; 1851 1852 free_write: 1853 free(tmp); 1854 close_write: 1855 fclose(file); 1856 write: 1857 file = fopen(fname, "w"); 1858 if (!file) { 1859 perror(fname); 1860 exit(1); 1861 } 1862 if (fwrite(b->p, 1, b->pos, file) != b->pos) { 1863 perror(fname); 1864 exit(1); 1865 } 1866 fclose(file); 1867 } 1868 1869 /* parse Module.symvers file. line format: 1870 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] 1871 **/ 1872 static void read_dump(const char *fname, unsigned int kernel) 1873 { 1874 unsigned long size, pos = 0; 1875 void *file = grab_file(fname, &size); 1876 char *line; 1877 1878 if (!file) 1879 /* No symbol versions, silently ignore */ 1880 return; 1881 1882 while ((line = get_next_line(&pos, file, size))) { 1883 char *symname, *modname, *d, *export, *end; 1884 unsigned int crc; 1885 struct module *mod; 1886 struct symbol *s; 1887 1888 if (!(symname = strchr(line, '\t'))) 1889 goto fail; 1890 *symname++ = '\0'; 1891 if (!(modname = strchr(symname, '\t'))) 1892 goto fail; 1893 *modname++ = '\0'; 1894 if ((export = strchr(modname, '\t')) != NULL) 1895 *export++ = '\0'; 1896 if (export && ((end = strchr(export, '\t')) != NULL)) 1897 *end = '\0'; 1898 crc = strtoul(line, &d, 16); 1899 if (*symname == '\0' || *modname == '\0' || *d != '\0') 1900 goto fail; 1901 mod = find_module(modname); 1902 if (!mod) { 1903 if (is_vmlinux(modname)) 1904 have_vmlinux = 1; 1905 mod = new_module(modname); 1906 mod->skip = 1; 1907 } 1908 s = sym_add_exported(symname, mod, export_no(export)); 1909 s->kernel = kernel; 1910 s->preloaded = 1; 1911 sym_update_crc(symname, mod, crc, export_no(export)); 1912 } 1913 return; 1914 fail: 1915 fatal("parse error in symbol dump file\n"); 1916 } 1917 1918 /* For normal builds always dump all symbols. 1919 * For external modules only dump symbols 1920 * that are not read from kernel Module.symvers. 1921 **/ 1922 static int dump_sym(struct symbol *sym) 1923 { 1924 if (!external_module) 1925 return 1; 1926 if (sym->vmlinux || sym->kernel) 1927 return 0; 1928 return 1; 1929 } 1930 1931 static void write_dump(const char *fname) 1932 { 1933 struct buffer buf = { }; 1934 struct symbol *symbol; 1935 int n; 1936 1937 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { 1938 symbol = symbolhash[n]; 1939 while (symbol) { 1940 if (dump_sym(symbol)) 1941 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", 1942 symbol->crc, symbol->name, 1943 symbol->module->name, 1944 export_str(symbol->export)); 1945 symbol = symbol->next; 1946 } 1947 } 1948 write_if_changed(&buf, fname); 1949 } 1950 1951 static void add_marker(struct module *mod, const char *name, const char *fmt) 1952 { 1953 char *line = NULL; 1954 asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt); 1955 NOFAIL(line); 1956 1957 mod->markers = NOFAIL(realloc(mod->markers, ((mod->nmarkers + 1) * 1958 sizeof mod->markers[0]))); 1959 mod->markers[mod->nmarkers++] = line; 1960 } 1961 1962 static void read_markers(const char *fname) 1963 { 1964 unsigned long size, pos = 0; 1965 void *file = grab_file(fname, &size); 1966 char *line; 1967 1968 if (!file) /* No old markers, silently ignore */ 1969 return; 1970 1971 while ((line = get_next_line(&pos, file, size))) { 1972 char *marker, *modname, *fmt; 1973 struct module *mod; 1974 1975 marker = line; 1976 modname = strchr(marker, '\t'); 1977 if (!modname) 1978 goto fail; 1979 *modname++ = '\0'; 1980 fmt = strchr(modname, '\t'); 1981 if (!fmt) 1982 goto fail; 1983 *fmt++ = '\0'; 1984 if (*marker == '\0' || *modname == '\0') 1985 goto fail; 1986 1987 mod = find_module(modname); 1988 if (!mod) { 1989 mod = new_module(modname); 1990 mod->skip = 1; 1991 } 1992 if (is_vmlinux(modname)) { 1993 have_vmlinux = 1; 1994 mod->skip = 0; 1995 } 1996 1997 if (!mod->skip) 1998 add_marker(mod, marker, fmt); 1999 } 2000 release_file(file, size); 2001 return; 2002 fail: 2003 fatal("parse error in markers list file\n"); 2004 } 2005 2006 static int compare_strings(const void *a, const void *b) 2007 { 2008 return strcmp(*(const char **) a, *(const char **) b); 2009 } 2010 2011 static void write_markers(const char *fname) 2012 { 2013 struct buffer buf = { }; 2014 struct module *mod; 2015 size_t i; 2016 2017 for (mod = modules; mod; mod = mod->next) 2018 if ((!external_module || !mod->skip) && mod->markers != NULL) { 2019 /* 2020 * Sort the strings so we can skip duplicates when 2021 * we write them out. 2022 */ 2023 qsort(mod->markers, mod->nmarkers, 2024 sizeof mod->markers[0], &compare_strings); 2025 for (i = 0; i < mod->nmarkers; ++i) { 2026 char *line = mod->markers[i]; 2027 buf_write(&buf, line, strlen(line)); 2028 while (i + 1 < mod->nmarkers && 2029 !strcmp(mod->markers[i], 2030 mod->markers[i + 1])) 2031 free(mod->markers[i++]); 2032 free(mod->markers[i]); 2033 } 2034 free(mod->markers); 2035 mod->markers = NULL; 2036 } 2037 2038 write_if_changed(&buf, fname); 2039 } 2040 2041 struct ext_sym_list { 2042 struct ext_sym_list *next; 2043 const char *file; 2044 }; 2045 2046 int main(int argc, char **argv) 2047 { 2048 struct module *mod; 2049 struct buffer buf = { }; 2050 char *kernel_read = NULL, *module_read = NULL; 2051 char *dump_write = NULL; 2052 char *markers_read = NULL; 2053 char *markers_write = NULL; 2054 int opt; 2055 int err; 2056 struct ext_sym_list *extsym_iter; 2057 struct ext_sym_list *extsym_start = NULL; 2058 2059 while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { 2060 switch (opt) { 2061 case 'i': 2062 kernel_read = optarg; 2063 break; 2064 case 'I': 2065 module_read = optarg; 2066 external_module = 1; 2067 break; 2068 case 'c': 2069 cross_build = 1; 2070 break; 2071 case 'e': 2072 external_module = 1; 2073 extsym_iter = 2074 NOFAIL(malloc(sizeof(*extsym_iter))); 2075 extsym_iter->next = extsym_start; 2076 extsym_iter->file = optarg; 2077 extsym_start = extsym_iter; 2078 break; 2079 case 'm': 2080 modversions = 1; 2081 break; 2082 case 'o': 2083 dump_write = optarg; 2084 break; 2085 case 'a': 2086 all_versions = 1; 2087 break; 2088 case 's': 2089 vmlinux_section_warnings = 0; 2090 break; 2091 case 'S': 2092 sec_mismatch_verbose = 0; 2093 break; 2094 case 'w': 2095 warn_unresolved = 1; 2096 break; 2097 case 'M': 2098 markers_write = optarg; 2099 break; 2100 case 'K': 2101 markers_read = optarg; 2102 break; 2103 default: 2104 exit(1); 2105 } 2106 } 2107 2108 if (kernel_read) 2109 read_dump(kernel_read, 1); 2110 if (module_read) 2111 read_dump(module_read, 0); 2112 while (extsym_start) { 2113 read_dump(extsym_start->file, 0); 2114 extsym_iter = extsym_start->next; 2115 free(extsym_start); 2116 extsym_start = extsym_iter; 2117 } 2118 2119 while (optind < argc) 2120 read_symbols(argv[optind++]); 2121 2122 for (mod = modules; mod; mod = mod->next) { 2123 if (mod->skip) 2124 continue; 2125 check_exports(mod); 2126 } 2127 2128 err = 0; 2129 2130 for (mod = modules; mod; mod = mod->next) { 2131 char fname[strlen(mod->name) + 10]; 2132 2133 if (mod->skip) 2134 continue; 2135 2136 buf.pos = 0; 2137 2138 add_header(&buf, mod); 2139 add_staging_flag(&buf, mod->name); 2140 err |= add_versions(&buf, mod); 2141 add_depends(&buf, mod, modules); 2142 add_moddevtable(&buf, mod); 2143 add_srcversion(&buf, mod); 2144 2145 sprintf(fname, "%s.mod.c", mod->name); 2146 write_if_changed(&buf, fname); 2147 } 2148 2149 if (dump_write) 2150 write_dump(dump_write); 2151 if (sec_mismatch_count && !sec_mismatch_verbose) 2152 warn("modpost: Found %d section mismatch(es).\n" 2153 "To see full details build your kernel with:\n" 2154 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", 2155 sec_mismatch_count); 2156 2157 if (markers_read) 2158 read_markers(markers_read); 2159 2160 if (markers_write) 2161 write_markers(markers_write); 2162 2163 return err; 2164 } 2165