genksyms.c 15 KB

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  1. /* Generate kernel symbol version hashes.
  2. Copyright 1996, 1997 Linux International.
  3. New implementation contributed by Richard Henderson <rth@tamu.edu>
  4. Based on original work by Bjorn Ekwall <bj0rn@blox.se>
  5. This file was part of the Linux modutils 2.4.22: moved back into the
  6. kernel sources by Rusty Russell/Kai Germaschewski.
  7. This program is free software; you can redistribute it and/or modify it
  8. under the terms of the GNU General Public License as published by the
  9. Free Software Foundation; either version 2 of the License, or (at your
  10. option) any later version.
  11. This program is distributed in the hope that it will be useful, but
  12. WITHOUT ANY WARRANTY; without even the implied warranty of
  13. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14. General Public License for more details.
  15. You should have received a copy of the GNU General Public License
  16. along with this program; if not, write to the Free Software Foundation,
  17. Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  18. #include <stdio.h>
  19. #include <string.h>
  20. #include <stdlib.h>
  21. #include <unistd.h>
  22. #include <assert.h>
  23. #include <stdarg.h>
  24. #ifdef __GNU_LIBRARY__
  25. #include <getopt.h>
  26. #endif /* __GNU_LIBRARY__ */
  27. #include "genksyms.h"
  28. /*----------------------------------------------------------------------*/
  29. #define HASH_BUCKETS 4096
  30. static struct symbol *symtab[HASH_BUCKETS];
  31. static FILE *debugfile;
  32. int cur_line = 1;
  33. char *cur_filename;
  34. static int flag_debug, flag_dump_defs, flag_dump_types, flag_warnings;
  35. static const char *arch = "";
  36. static const char *mod_prefix = "";
  37. static int errors;
  38. static int nsyms;
  39. static struct symbol *expansion_trail;
  40. static struct symbol *visited_symbols;
  41. static const char *const symbol_type_name[] = {
  42. "normal", "typedef", "enum", "struct", "union"
  43. };
  44. static int equal_list(struct string_list *a, struct string_list *b);
  45. static void print_list(FILE * f, struct string_list *list);
  46. /*----------------------------------------------------------------------*/
  47. static const unsigned int crctab32[] = {
  48. 0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U,
  49. 0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U,
  50. 0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U,
  51. 0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU,
  52. 0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U,
  53. 0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U,
  54. 0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U,
  55. 0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU,
  56. 0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U,
  57. 0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU,
  58. 0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U,
  59. 0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U,
  60. 0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U,
  61. 0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU,
  62. 0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU,
  63. 0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U,
  64. 0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU,
  65. 0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U,
  66. 0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U,
  67. 0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U,
  68. 0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU,
  69. 0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U,
  70. 0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U,
  71. 0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU,
  72. 0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U,
  73. 0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U,
  74. 0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U,
  75. 0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U,
  76. 0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U,
  77. 0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU,
  78. 0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU,
  79. 0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U,
  80. 0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U,
  81. 0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU,
  82. 0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU,
  83. 0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U,
  84. 0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU,
  85. 0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U,
  86. 0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU,
  87. 0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U,
  88. 0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU,
  89. 0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U,
  90. 0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U,
  91. 0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU,
  92. 0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U,
  93. 0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U,
  94. 0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U,
  95. 0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U,
  96. 0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U,
  97. 0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U,
  98. 0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU,
  99. 0x2d02ef8dU
  100. };
  101. static unsigned long partial_crc32_one(unsigned char c, unsigned long crc)
  102. {
  103. return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
  104. }
  105. static unsigned long partial_crc32(const char *s, unsigned long crc)
  106. {
  107. while (*s)
  108. crc = partial_crc32_one(*s++, crc);
  109. return crc;
  110. }
  111. static unsigned long crc32(const char *s)
  112. {
  113. return partial_crc32(s, 0xffffffff) ^ 0xffffffff;
  114. }
  115. /*----------------------------------------------------------------------*/
  116. static enum symbol_type map_to_ns(enum symbol_type t)
  117. {
  118. if (t == SYM_TYPEDEF)
  119. t = SYM_NORMAL;
  120. else if (t == SYM_UNION)
  121. t = SYM_STRUCT;
  122. return t;
  123. }
  124. struct symbol *find_symbol(const char *name, enum symbol_type ns)
  125. {
  126. unsigned long h = crc32(name) % HASH_BUCKETS;
  127. struct symbol *sym;
  128. for (sym = symtab[h]; sym; sym = sym->hash_next)
  129. if (map_to_ns(sym->type) == map_to_ns(ns) &&
  130. strcmp(name, sym->name) == 0)
  131. break;
  132. return sym;
  133. }
  134. struct symbol *add_symbol(const char *name, enum symbol_type type,
  135. struct string_list *defn, int is_extern)
  136. {
  137. unsigned long h = crc32(name) % HASH_BUCKETS;
  138. struct symbol *sym;
  139. for (sym = symtab[h]; sym; sym = sym->hash_next) {
  140. if (map_to_ns(sym->type) == map_to_ns(type)
  141. && strcmp(name, sym->name) == 0) {
  142. if (!equal_list(sym->defn, defn))
  143. error_with_pos("redefinition of %s", name);
  144. return sym;
  145. }
  146. }
  147. sym = xmalloc(sizeof(*sym));
  148. sym->name = name;
  149. sym->type = type;
  150. sym->defn = defn;
  151. sym->expansion_trail = NULL;
  152. sym->visited = NULL;
  153. sym->is_extern = is_extern;
  154. sym->hash_next = symtab[h];
  155. symtab[h] = sym;
  156. if (flag_debug) {
  157. fprintf(debugfile, "Defn for %s %s == <",
  158. symbol_type_name[type], name);
  159. if (is_extern)
  160. fputs("extern ", debugfile);
  161. print_list(debugfile, defn);
  162. fputs(">\n", debugfile);
  163. }
  164. ++nsyms;
  165. return sym;
  166. }
  167. /*----------------------------------------------------------------------*/
  168. void free_node(struct string_list *node)
  169. {
  170. free(node->string);
  171. free(node);
  172. }
  173. void free_list(struct string_list *s, struct string_list *e)
  174. {
  175. while (s != e) {
  176. struct string_list *next = s->next;
  177. free_node(s);
  178. s = next;
  179. }
  180. }
  181. struct string_list *copy_node(struct string_list *node)
  182. {
  183. struct string_list *newnode;
  184. newnode = xmalloc(sizeof(*newnode));
  185. newnode->string = xstrdup(node->string);
  186. newnode->tag = node->tag;
  187. return newnode;
  188. }
  189. static int equal_list(struct string_list *a, struct string_list *b)
  190. {
  191. while (a && b) {
  192. if (a->tag != b->tag || strcmp(a->string, b->string))
  193. return 0;
  194. a = a->next;
  195. b = b->next;
  196. }
  197. return !a && !b;
  198. }
  199. static void print_node(FILE * f, struct string_list *list)
  200. {
  201. if (list->tag != SYM_NORMAL) {
  202. putc(symbol_type_name[list->tag][0], f);
  203. putc('#', f);
  204. }
  205. fputs(list->string, f);
  206. }
  207. static void print_list(FILE * f, struct string_list *list)
  208. {
  209. struct string_list **e, **b;
  210. struct string_list *tmp, **tmp2;
  211. int elem = 1;
  212. if (list == NULL) {
  213. fputs("(nil)", f);
  214. return;
  215. }
  216. tmp = list;
  217. while ((tmp = tmp->next) != NULL)
  218. elem++;
  219. b = alloca(elem * sizeof(*e));
  220. e = b + elem;
  221. tmp2 = e - 1;
  222. (*tmp2--) = list;
  223. while ((list = list->next) != NULL)
  224. *(tmp2--) = list;
  225. while (b != e) {
  226. print_node(f, *b++);
  227. putc(' ', f);
  228. }
  229. }
  230. static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc)
  231. {
  232. struct string_list *list = sym->defn;
  233. struct string_list **e, **b;
  234. struct string_list *tmp, **tmp2;
  235. int elem = 1;
  236. if (!list)
  237. return crc;
  238. tmp = list;
  239. while ((tmp = tmp->next) != NULL)
  240. elem++;
  241. b = alloca(elem * sizeof(*e));
  242. e = b + elem;
  243. tmp2 = e - 1;
  244. *(tmp2--) = list;
  245. while ((list = list->next) != NULL)
  246. *(tmp2--) = list;
  247. while (b != e) {
  248. struct string_list *cur;
  249. struct symbol *subsym;
  250. cur = *(b++);
  251. switch (cur->tag) {
  252. case SYM_NORMAL:
  253. if (flag_dump_defs)
  254. fprintf(debugfile, "%s ", cur->string);
  255. crc = partial_crc32(cur->string, crc);
  256. crc = partial_crc32_one(' ', crc);
  257. break;
  258. case SYM_TYPEDEF:
  259. subsym = find_symbol(cur->string, cur->tag);
  260. if (subsym->expansion_trail) {
  261. if (flag_dump_defs)
  262. fprintf(debugfile, "%s ", cur->string);
  263. crc = partial_crc32(cur->string, crc);
  264. crc = partial_crc32_one(' ', crc);
  265. } else {
  266. subsym->expansion_trail = expansion_trail;
  267. expansion_trail = subsym;
  268. crc = expand_and_crc_sym(subsym, crc);
  269. }
  270. break;
  271. case SYM_STRUCT:
  272. case SYM_UNION:
  273. case SYM_ENUM:
  274. subsym = find_symbol(cur->string, cur->tag);
  275. if (!subsym) {
  276. struct string_list *n, *t = NULL;
  277. error_with_pos("expand undefined %s %s",
  278. symbol_type_name[cur->tag],
  279. cur->string);
  280. n = xmalloc(sizeof(*n));
  281. n->string = xstrdup(symbol_type_name[cur->tag]);
  282. n->tag = SYM_NORMAL;
  283. n->next = t;
  284. t = n;
  285. n = xmalloc(sizeof(*n));
  286. n->string = xstrdup(cur->string);
  287. n->tag = SYM_NORMAL;
  288. n->next = t;
  289. t = n;
  290. n = xmalloc(sizeof(*n));
  291. n->string = xstrdup("{ UNKNOWN }");
  292. n->tag = SYM_NORMAL;
  293. n->next = t;
  294. subsym =
  295. add_symbol(cur->string, cur->tag, n, 0);
  296. }
  297. if (subsym->expansion_trail) {
  298. if (flag_dump_defs) {
  299. fprintf(debugfile, "%s %s ",
  300. symbol_type_name[cur->tag],
  301. cur->string);
  302. }
  303. crc = partial_crc32(symbol_type_name[cur->tag],
  304. crc);
  305. crc = partial_crc32_one(' ', crc);
  306. crc = partial_crc32(cur->string, crc);
  307. crc = partial_crc32_one(' ', crc);
  308. } else {
  309. subsym->expansion_trail = expansion_trail;
  310. expansion_trail = subsym;
  311. crc = expand_and_crc_sym(subsym, crc);
  312. }
  313. break;
  314. }
  315. }
  316. {
  317. static struct symbol **end = &visited_symbols;
  318. if (!sym->visited) {
  319. *end = sym;
  320. end = &sym->visited;
  321. sym->visited = (struct symbol *)-1L;
  322. }
  323. }
  324. return crc;
  325. }
  326. void export_symbol(const char *name)
  327. {
  328. struct symbol *sym;
  329. sym = find_symbol(name, SYM_NORMAL);
  330. if (!sym)
  331. error_with_pos("export undefined symbol %s", name);
  332. else {
  333. unsigned long crc;
  334. if (flag_dump_defs)
  335. fprintf(debugfile, "Export %s == <", name);
  336. expansion_trail = (struct symbol *)-1L;
  337. crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff;
  338. sym = expansion_trail;
  339. while (sym != (struct symbol *)-1L) {
  340. struct symbol *n = sym->expansion_trail;
  341. sym->expansion_trail = 0;
  342. sym = n;
  343. }
  344. if (flag_dump_defs)
  345. fputs(">\n", debugfile);
  346. /* Used as a linker script. */
  347. printf("%s__crc_%s = 0x%08lx ;\n", mod_prefix, name, crc);
  348. }
  349. }
  350. /*----------------------------------------------------------------------*/
  351. void error_with_pos(const char *fmt, ...)
  352. {
  353. va_list args;
  354. if (flag_warnings) {
  355. fprintf(stderr, "%s:%d: ", cur_filename ? : "<stdin>",
  356. cur_line);
  357. va_start(args, fmt);
  358. vfprintf(stderr, fmt, args);
  359. va_end(args);
  360. putc('\n', stderr);
  361. errors++;
  362. }
  363. }
  364. static void genksyms_usage(void)
  365. {
  366. fputs("Usage:\n" "genksyms [-dDwqhV] > /path/to/.tmp_obj.ver\n" "\n"
  367. #ifdef __GNU_LIBRARY__
  368. " -d, --debug Increment the debug level (repeatable)\n"
  369. " -D, --dump Dump expanded symbol defs (for debugging only)\n"
  370. " -w, --warnings Enable warnings\n"
  371. " -q, --quiet Disable warnings (default)\n"
  372. " -h, --help Print this message\n"
  373. " -V, --version Print the release version\n"
  374. #else /* __GNU_LIBRARY__ */
  375. " -d Increment the debug level (repeatable)\n"
  376. " -D Dump expanded symbol defs (for debugging only)\n"
  377. " -w Enable warnings\n"
  378. " -q Disable warnings (default)\n"
  379. " -h Print this message\n"
  380. " -V Print the release version\n"
  381. #endif /* __GNU_LIBRARY__ */
  382. , stderr);
  383. }
  384. int main(int argc, char **argv)
  385. {
  386. FILE *dumpfile = NULL;
  387. int o;
  388. #ifdef __GNU_LIBRARY__
  389. struct option long_opts[] = {
  390. {"arch", 1, 0, 'a'},
  391. {"debug", 0, 0, 'd'},
  392. {"warnings", 0, 0, 'w'},
  393. {"quiet", 0, 0, 'q'},
  394. {"dump", 0, 0, 'D'},
  395. {"dump-types", 1, 0, 'T'},
  396. {"version", 0, 0, 'V'},
  397. {"help", 0, 0, 'h'},
  398. {0, 0, 0, 0}
  399. };
  400. while ((o = getopt_long(argc, argv, "a:dwqVDT:k:p:",
  401. &long_opts[0], NULL)) != EOF)
  402. #else /* __GNU_LIBRARY__ */
  403. while ((o = getopt(argc, argv, "a:dwqVDT:k:p:")) != EOF)
  404. #endif /* __GNU_LIBRARY__ */
  405. switch (o) {
  406. case 'a':
  407. arch = optarg;
  408. break;
  409. case 'd':
  410. flag_debug++;
  411. break;
  412. case 'w':
  413. flag_warnings = 1;
  414. break;
  415. case 'q':
  416. flag_warnings = 0;
  417. break;
  418. case 'V':
  419. fputs("genksyms version 2.5.60\n", stderr);
  420. break;
  421. case 'D':
  422. flag_dump_defs = 1;
  423. break;
  424. case 'T':
  425. flag_dump_types = 1;
  426. dumpfile = fopen(optarg, "w");
  427. if (!dumpfile) {
  428. perror(optarg);
  429. return 1;
  430. }
  431. break;
  432. case 'h':
  433. genksyms_usage();
  434. return 0;
  435. default:
  436. genksyms_usage();
  437. return 1;
  438. }
  439. if ((strcmp(arch, "v850") == 0) || (strcmp(arch, "h8300") == 0))
  440. mod_prefix = "_";
  441. {
  442. extern int yydebug;
  443. extern int yy_flex_debug;
  444. yydebug = (flag_debug > 1);
  445. yy_flex_debug = (flag_debug > 2);
  446. debugfile = stderr;
  447. /* setlinebuf(debugfile); */
  448. }
  449. yyparse();
  450. if (flag_dump_types && visited_symbols) {
  451. while (visited_symbols != (struct symbol *)-1L) {
  452. struct symbol *sym = visited_symbols;
  453. if (sym->type != SYM_NORMAL) {
  454. putc(symbol_type_name[sym->type][0], dumpfile);
  455. putc('#', dumpfile);
  456. }
  457. fputs(sym->name, dumpfile);
  458. putc(' ', dumpfile);
  459. print_list(dumpfile, sym->defn);
  460. putc('\n', dumpfile);
  461. visited_symbols = sym->visited;
  462. sym->visited = NULL;
  463. }
  464. }
  465. if (flag_debug) {
  466. fprintf(debugfile, "Hash table occupancy %d/%d = %g\n",
  467. nsyms, HASH_BUCKETS,
  468. (double)nsyms / (double)HASH_BUCKETS);
  469. }
  470. return errors != 0;
  471. }