libdl.c 19 KB

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * Program to load an ELF binary on a linux system, and run it
  4. * after resolving ELF shared library symbols
  5. *
  6. * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
  7. * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
  8. * David Engel, Hongjiu Lu and Mitch D'Souza
  9. *
  10. * Redistribution and use in source and binary forms, with or without
  11. * modification, are permitted provided that the following conditions
  12. * are met:
  13. * 1. Redistributions of source code must retain the above copyright
  14. * notice, this list of conditions and the following disclaimer.
  15. * 2. The name of the above contributors may not be
  16. * used to endorse or promote products derived from this software
  17. * without specific prior written permission.
  18. *
  19. * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
  20. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22. * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
  23. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29. * SUCH DAMAGE.
  30. */
  31. #define _GNU_SOURCE
  32. #include <ldso.h>
  33. #include <stdio.h>
  34. #ifdef SHARED
  35. /* When libdl is loaded as a shared library, we need to load in
  36. * and use a pile of symbols from ldso... */
  37. extern char *_dl_find_hash(const char *, struct dyn_elf *, struct elf_resolve *, int);
  38. extern struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **,
  39. struct elf_resolve *, char *, int);
  40. extern int _dl_fixup(struct dyn_elf *rpnt, int lazy);
  41. extern void _dl_protect_relro(struct elf_resolve * tpnt);
  42. extern int _dl_errno;
  43. extern struct dyn_elf *_dl_symbol_tables;
  44. extern struct dyn_elf *_dl_handles;
  45. extern struct elf_resolve *_dl_loaded_modules;
  46. extern struct r_debug *_dl_debug_addr;
  47. extern unsigned long _dl_error_number;
  48. extern void *(*_dl_malloc_function)(size_t);
  49. #ifdef __LDSO_CACHE_SUPPORT__
  50. int _dl_map_cache(void);
  51. int _dl_unmap_cache(void);
  52. #endif
  53. #ifdef __mips__
  54. extern void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt, int lazy);
  55. #endif
  56. #ifdef __SUPPORT_LD_DEBUG__
  57. extern char *_dl_debug;
  58. #endif
  59. #else /* SHARED */
  60. /* When libdl is linked as a static library, we need to replace all
  61. * the symbols that otherwise would have been loaded in from ldso... */
  62. #ifdef __SUPPORT_LD_DEBUG__
  63. char *_dl_debug = 0;
  64. #endif
  65. const char *_dl_progname = ""; /* Program name */
  66. char *_dl_library_path = 0; /* Where we look for libraries */
  67. char *_dl_ldsopath = 0; /* Location of the shared lib loader */
  68. int _dl_errno = 0; /* We can't use the real errno in ldso */
  69. size_t _dl_pagesize = PAGE_SIZE; /* Store the page size for use later */
  70. /* This global variable is also to communicate with debuggers such as gdb. */
  71. struct r_debug *_dl_debug_addr = NULL;
  72. #define _dl_malloc malloc
  73. #include "../ldso/dl-debug.c"
  74. #include LDSO_ELFINTERP
  75. #include "../ldso/dl-hash.c"
  76. #define _dl_trace_loaded_objects 0
  77. #include "../ldso/dl-elf.c"
  78. #endif /* SHARED */
  79. #ifdef __SUPPORT_LD_DEBUG__
  80. # define _dl_if_debug_print(fmt, args...) \
  81. do { \
  82. if (_dl_debug) \
  83. fprintf(stderr, "%s():%i: " fmt, __FUNCTION__, __LINE__, ## args); \
  84. } while (0)
  85. #else
  86. # define _dl_if_debug_print(fmt, args...)
  87. #endif
  88. static int do_dlclose(void *, int need_fini);
  89. static const char *dl_error_names[] = {
  90. "",
  91. "File not found",
  92. "Unable to open /dev/zero",
  93. "Not an ELF file",
  94. #if defined (__i386__)
  95. "Not i386 binary",
  96. #elif defined (__sparc__)
  97. "Not sparc binary",
  98. #elif defined (__mc68000__)
  99. "Not m68k binary",
  100. #else
  101. "Unrecognized binary type",
  102. #endif
  103. "Not an ELF shared library",
  104. "Unable to mmap file",
  105. "No dynamic section",
  106. #ifdef ELF_USES_RELOCA
  107. "Unable to process REL relocs",
  108. #else
  109. "Unable to process RELA relocs",
  110. #endif
  111. "Bad handle",
  112. "Unable to resolve symbol"
  113. };
  114. void __attribute__ ((destructor)) dl_cleanup(void)
  115. {
  116. struct dyn_elf *d;
  117. for (d = _dl_handles; d; d = d->next_handle) {
  118. do_dlclose(d, 1);
  119. }
  120. }
  121. void *dlopen(const char *libname, int flag)
  122. {
  123. struct elf_resolve *tpnt, *tfrom;
  124. struct dyn_elf *dyn_chain, *rpnt = NULL, *dyn_ptr, *relro_ptr, *handle;
  125. struct dyn_elf *dpnt;
  126. ElfW(Addr) from;
  127. struct elf_resolve *tpnt1;
  128. void (*dl_brk) (void);
  129. int now_flag;
  130. struct init_fini_list *tmp, *runp, *runp2, *dep_list;
  131. int nlist, i;
  132. struct elf_resolve **init_fini_list;
  133. /* A bit of sanity checking... */
  134. if (!(flag & (RTLD_LAZY|RTLD_NOW))) {
  135. _dl_error_number = LD_BAD_HANDLE;
  136. return NULL;
  137. }
  138. from = (ElfW(Addr)) __builtin_return_address(0);
  139. /* Cover the trivial case first */
  140. if (!libname)
  141. return _dl_symbol_tables;
  142. _dl_map_cache();
  143. /*
  144. * Try and locate the module we were called from - we
  145. * need this so that we get the correct RPATH/RUNPATH. Note that
  146. * this is the current behavior under Solaris, but the
  147. * ABI+ specifies that we should only use the RPATH from
  148. * the application. Thus this may go away at some time
  149. * in the future.
  150. */
  151. tfrom = NULL;
  152. for (dpnt = _dl_symbol_tables; dpnt; dpnt = dpnt->next) {
  153. tpnt = dpnt->dyn;
  154. if (tpnt->loadaddr < from
  155. && (tfrom == NULL || tfrom->loadaddr < tpnt->loadaddr))
  156. tfrom = tpnt;
  157. }
  158. for(rpnt = _dl_symbol_tables; rpnt && rpnt->next; rpnt=rpnt->next);
  159. relro_ptr = rpnt;
  160. now_flag = (flag & RTLD_NOW) ? RTLD_NOW : 0;
  161. if (getenv("LD_BIND_NOW"))
  162. now_flag = RTLD_NOW;
  163. /* Try to load the specified library */
  164. _dl_if_debug_print("Trying to dlopen '%s', RTLD_GLOBAL:%d RTLD_NOW:%d\n",
  165. (char*)libname, (flag & RTLD_GLOBAL ? 1:0), (now_flag & RTLD_NOW ? 1:0));
  166. tpnt = _dl_load_shared_library(0, &rpnt, tfrom, (char*)libname, 0);
  167. if (tpnt == NULL) {
  168. _dl_unmap_cache();
  169. return NULL;
  170. }
  171. dyn_chain = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
  172. _dl_memset(dyn_chain, 0, sizeof(struct dyn_elf));
  173. dyn_chain->dyn = tpnt;
  174. tpnt->rtld_flags |= (flag & RTLD_GLOBAL);
  175. dyn_chain->next_handle = _dl_handles;
  176. _dl_handles = dyn_ptr = dyn_chain;
  177. if (tpnt->usage_count > 1) {
  178. _dl_if_debug_print("Lib: %s already opened\n", libname);
  179. /* see if there is a handle from a earlier dlopen */
  180. for (handle = _dl_handles->next_handle; handle; handle = handle->next_handle) {
  181. if (handle->dyn == tpnt) {
  182. dyn_chain->init_fini.init_fini = handle->init_fini.init_fini;
  183. dyn_chain->init_fini.nlist = handle->init_fini.nlist;
  184. for(i=0; i < dyn_chain->init_fini.nlist; i++)
  185. dyn_chain->init_fini.init_fini[i]->rtld_flags |= (flag & RTLD_GLOBAL);
  186. dyn_chain->next = handle->next;
  187. break;
  188. }
  189. }
  190. return dyn_chain;
  191. } else {
  192. tpnt->init_flag |= DL_OPENED;
  193. }
  194. _dl_if_debug_print("Looking for needed libraries\n");
  195. nlist = 0;
  196. runp = alloca(sizeof(*runp));
  197. runp->tpnt = tpnt;
  198. runp->next = NULL;
  199. dep_list = runp2 = runp;
  200. for (; runp; runp = runp->next)
  201. {
  202. ElfW(Dyn) *dpnt;
  203. char *lpntstr;
  204. nlist++;
  205. runp->tpnt->init_fini = NULL; /* clear any previous dependcies */
  206. for (dpnt = (ElfW(Dyn) *) runp->tpnt->dynamic_addr; dpnt->d_tag; dpnt++) {
  207. if (dpnt->d_tag == DT_NEEDED) {
  208. char *name;
  209. lpntstr = (char*) (runp->tpnt->dynamic_info[DT_STRTAB] +
  210. dpnt->d_un.d_val);
  211. name = _dl_get_last_path_component(lpntstr);
  212. _dl_if_debug_print("Trying to load '%s', needed by '%s'\n",
  213. lpntstr, runp->tpnt->libname);
  214. tpnt1 = _dl_load_shared_library(0, &rpnt, runp->tpnt, lpntstr, 0);
  215. if (!tpnt1)
  216. goto oops;
  217. tpnt1->rtld_flags |= (flag & RTLD_GLOBAL);
  218. if (tpnt1->usage_count == 1) {
  219. tpnt1->init_flag |= DL_OPENED;
  220. /* This list is for dlsym() and relocation */
  221. dyn_ptr->next = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
  222. _dl_memset (dyn_ptr->next, 0, sizeof (struct dyn_elf));
  223. dyn_ptr = dyn_ptr->next;
  224. dyn_ptr->dyn = tpnt1;
  225. }
  226. if (tpnt1->init_flag & DL_OPENED) {
  227. /* Used to record RTLD_LOCAL scope */
  228. tmp = alloca(sizeof(struct init_fini_list));
  229. tmp->tpnt = tpnt1;
  230. tmp->next = runp->tpnt->init_fini;
  231. runp->tpnt->init_fini = tmp;
  232. for (tmp=dep_list; tmp; tmp = tmp->next) {
  233. if (tpnt1 == tmp->tpnt) { /* if match => cirular dependency, drop it */
  234. _dl_if_debug_print("Circular dependency, skipping '%s',\n",
  235. tmp->tpnt->libname);
  236. tpnt1->usage_count--;
  237. break;
  238. }
  239. }
  240. if (!tmp) { /* Don't add if circular dependency detected */
  241. runp2->next = alloca(sizeof(*runp));
  242. runp2 = runp2->next;
  243. runp2->tpnt = tpnt1;
  244. runp2->next = NULL;
  245. }
  246. }
  247. }
  248. }
  249. }
  250. init_fini_list = malloc(nlist * sizeof(struct elf_resolve *));
  251. dyn_chain->init_fini.init_fini = init_fini_list;
  252. dyn_chain->init_fini.nlist = nlist;
  253. i = 0;
  254. for (runp2 = dep_list; runp2; runp2 = runp2->next) {
  255. init_fini_list[i++] = runp2->tpnt;
  256. for(runp = runp2->tpnt->init_fini; runp; runp = runp->next){
  257. if (!(runp->tpnt->rtld_flags & RTLD_GLOBAL)) {
  258. tmp = malloc(sizeof(struct init_fini_list));
  259. tmp->tpnt = runp->tpnt;
  260. tmp->next = runp2->tpnt->rtld_local;
  261. runp2->tpnt->rtld_local = tmp;
  262. }
  263. }
  264. }
  265. /* Sort the INIT/FINI list in dependency order. */
  266. for (runp2 = dep_list; runp2; runp2 = runp2->next) {
  267. int j, k;
  268. for (j = 0; init_fini_list[j] != runp2->tpnt; ++j)
  269. /* Empty */;
  270. for (k = j + 1; k < nlist; ++k) {
  271. struct init_fini_list *runp = init_fini_list[k]->init_fini;
  272. for (; runp; runp = runp->next) {
  273. if (runp->tpnt == runp2->tpnt) {
  274. struct elf_resolve *here = init_fini_list[k];
  275. _dl_if_debug_print("Move %s from pos %d to %d in INIT/FINI list.\n", here->libname, k, j);
  276. for (i = (k - j); i; --i)
  277. init_fini_list[i+j] = init_fini_list[i+j-1];
  278. init_fini_list[j] = here;
  279. ++j;
  280. break;
  281. }
  282. }
  283. }
  284. }
  285. #ifdef __SUPPORT_LD_DEBUG__
  286. if(_dl_debug) {
  287. fprintf(stderr, "\nINIT/FINI order and dependencies:\n");
  288. for (i=0;i < nlist;i++) {
  289. fprintf(stderr, "lib: %s has deps:\n", init_fini_list[i]->libname);
  290. runp = init_fini_list[i]->init_fini;
  291. for (; runp; runp = runp->next)
  292. printf(" %s ", runp->tpnt->libname);
  293. printf("\n");
  294. }
  295. }
  296. #endif
  297. _dl_if_debug_print("Beginning dlopen relocation fixups\n");
  298. /*
  299. * OK, now all of the kids are tucked into bed in their proper addresses.
  300. * Now we go through and look for REL and RELA records that indicate fixups
  301. * to the GOT tables. We need to do this in reverse order so that COPY
  302. * directives work correctly */
  303. #ifdef __mips__
  304. /*
  305. * Relocation of the GOT entries for MIPS have to be done
  306. * after all the libraries have been loaded.
  307. */
  308. _dl_perform_mips_global_got_relocations(tpnt, !now_flag);
  309. #endif
  310. if (_dl_fixup(dyn_chain, now_flag))
  311. goto oops;
  312. if (relro_ptr) {
  313. for (rpnt = relro_ptr->next; rpnt; rpnt = rpnt->next) {
  314. if (rpnt->dyn->relro_size)
  315. _dl_protect_relro(rpnt->dyn);
  316. }
  317. }
  318. /* TODO: Should we set the protections of all pages back to R/O now ? */
  319. /* Notify the debugger we have added some objects. */
  320. if (_dl_debug_addr) {
  321. dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
  322. if (dl_brk != NULL) {
  323. _dl_debug_addr->r_state = RT_ADD;
  324. (*dl_brk) ();
  325. _dl_debug_addr->r_state = RT_CONSISTENT;
  326. (*dl_brk) ();
  327. }
  328. }
  329. #ifdef SHARED
  330. /* Run the ctors and setup the dtors */
  331. for (i = nlist; i; --i) {
  332. tpnt = init_fini_list[i-1];
  333. if (tpnt->init_flag & INIT_FUNCS_CALLED)
  334. continue;
  335. tpnt->init_flag |= INIT_FUNCS_CALLED;
  336. if (tpnt->dynamic_info[DT_INIT]) {
  337. void (*dl_elf_func) (void);
  338. dl_elf_func = (void (*)(void)) (tpnt->loadaddr + tpnt->dynamic_info[DT_INIT]);
  339. if (dl_elf_func && *dl_elf_func != NULL) {
  340. _dl_if_debug_print("running ctors for library %s at '%p'\n",
  341. tpnt->libname, dl_elf_func);
  342. (*dl_elf_func) ();
  343. }
  344. }
  345. }
  346. #endif /* SHARED */
  347. _dl_unmap_cache();
  348. return (void *) dyn_chain;
  349. oops:
  350. /* Something went wrong. Clean up and return NULL. */
  351. _dl_unmap_cache();
  352. do_dlclose(dyn_chain, 0);
  353. return NULL;
  354. }
  355. void *dlsym(void *vhandle, const char *name)
  356. {
  357. struct elf_resolve *tpnt, *tfrom;
  358. struct dyn_elf *handle;
  359. ElfW(Addr) from;
  360. struct dyn_elf *rpnt;
  361. void *ret;
  362. handle = (struct dyn_elf *) vhandle;
  363. /* First of all verify that we have a real handle
  364. of some kind. Return NULL if not a valid handle. */
  365. if (handle == NULL)
  366. handle = _dl_symbol_tables;
  367. else if (handle != RTLD_NEXT && handle != _dl_symbol_tables) {
  368. for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle)
  369. if (rpnt == handle)
  370. break;
  371. if (!rpnt) {
  372. _dl_error_number = LD_BAD_HANDLE;
  373. return NULL;
  374. }
  375. } else if (handle == RTLD_NEXT) {
  376. /*
  377. * Try and locate the module we were called from - we
  378. * need this so that we know where to start searching
  379. * from. We never pass RTLD_NEXT down into the actual
  380. * dynamic loader itself, as it doesn't know
  381. * how to properly treat it.
  382. */
  383. from = (ElfW(Addr)) __builtin_return_address(0);
  384. tfrom = NULL;
  385. for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next) {
  386. tpnt = rpnt->dyn;
  387. if (tpnt->loadaddr < from
  388. && (tfrom == NULL || tfrom->loadaddr < tpnt->loadaddr)) {
  389. tfrom = tpnt;
  390. handle = rpnt->next;
  391. }
  392. }
  393. }
  394. ret = _dl_find_hash((char*)name, handle, NULL, 0);
  395. /*
  396. * Nothing found.
  397. */
  398. if (!ret)
  399. _dl_error_number = LD_NO_SYMBOL;
  400. return ret;
  401. }
  402. #if 0
  403. void *dlvsym(void *vhandle, const char *name, const char *version)
  404. {
  405. return dlsym(vhandle, name);
  406. }
  407. #endif
  408. static int do_dlclose(void *vhandle, int need_fini)
  409. {
  410. struct dyn_elf *rpnt, *rpnt1, *rpnt1_tmp;
  411. struct init_fini_list *runp, *tmp;
  412. ElfW(Phdr) *ppnt;
  413. struct elf_resolve *tpnt, *run_tpnt;
  414. int (*dl_elf_fini) (void);
  415. void (*dl_brk) (void);
  416. struct dyn_elf *handle;
  417. unsigned int end;
  418. int i = 0, j;
  419. handle = (struct dyn_elf *) vhandle;
  420. if (handle == _dl_symbol_tables)
  421. return 0;
  422. rpnt1 = NULL;
  423. for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle) {
  424. if (rpnt == handle)
  425. break;
  426. rpnt1 = rpnt;
  427. }
  428. if (!rpnt) {
  429. _dl_error_number = LD_BAD_HANDLE;
  430. return 1;
  431. }
  432. if (rpnt1)
  433. rpnt1->next_handle = rpnt->next_handle;
  434. else
  435. _dl_handles = rpnt->next_handle;
  436. _dl_if_debug_print("%s: usage count: %d\n",
  437. handle->dyn->libname, handle->dyn->usage_count);
  438. if (handle->dyn->usage_count != 1) {
  439. handle->dyn->usage_count--;
  440. free(handle);
  441. return 0;
  442. }
  443. /* OK, this is a valid handle - now close out the file */
  444. for (j = 0; j < handle->init_fini.nlist; ++j) {
  445. tpnt = handle->init_fini.init_fini[j];
  446. if (--tpnt->usage_count == 0) {
  447. if (tpnt->dynamic_info[DT_FINI] && need_fini &&
  448. !(tpnt->init_flag & FINI_FUNCS_CALLED)) {
  449. tpnt->init_flag |= FINI_FUNCS_CALLED;
  450. dl_elf_fini = (int (*)(void)) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI]);
  451. _dl_if_debug_print("running dtors for library %s at '%p'\n",
  452. tpnt->libname, dl_elf_fini);
  453. (*dl_elf_fini) ();
  454. }
  455. _dl_if_debug_print("unmapping: %s\n", tpnt->libname);
  456. end = 0;
  457. for (i = 0, ppnt = tpnt->ppnt;
  458. i < tpnt->n_phent; ppnt++, i++) {
  459. if (ppnt->p_type != PT_LOAD)
  460. continue;
  461. if (end < ppnt->p_vaddr + ppnt->p_memsz)
  462. end = ppnt->p_vaddr + ppnt->p_memsz;
  463. }
  464. _dl_munmap((void*)tpnt->loadaddr, end);
  465. /* Free elements in RTLD_LOCAL scope list */
  466. for (runp = tpnt->rtld_local; runp; runp = tmp) {
  467. tmp = runp->next;
  468. free(runp);
  469. }
  470. /* Next, remove tpnt from the loaded_module list */
  471. if (_dl_loaded_modules == tpnt) {
  472. _dl_loaded_modules = tpnt->next;
  473. if (_dl_loaded_modules)
  474. _dl_loaded_modules->prev = 0;
  475. } else
  476. for (run_tpnt = _dl_loaded_modules; run_tpnt; run_tpnt = run_tpnt->next)
  477. if (run_tpnt->next == tpnt) {
  478. _dl_if_debug_print("removing loaded_modules: %s\n", tpnt->libname);
  479. run_tpnt->next = run_tpnt->next->next;
  480. if (run_tpnt->next)
  481. run_tpnt->next->prev = run_tpnt;
  482. break;
  483. }
  484. /* Next, remove tpnt from the global symbol table list */
  485. if (_dl_symbol_tables) {
  486. if (_dl_symbol_tables->dyn == tpnt) {
  487. _dl_symbol_tables = _dl_symbol_tables->next;
  488. if (_dl_symbol_tables)
  489. _dl_symbol_tables->prev = 0;
  490. } else
  491. for (rpnt1 = _dl_symbol_tables; rpnt1->next; rpnt1 = rpnt1->next) {
  492. if (rpnt1->next->dyn == tpnt) {
  493. _dl_if_debug_print("removing symbol_tables: %s\n", tpnt->libname);
  494. rpnt1_tmp = rpnt1->next->next;
  495. free(rpnt1->next);
  496. rpnt1->next = rpnt1_tmp;
  497. if (rpnt1->next)
  498. rpnt1->next->prev = rpnt1;
  499. break;
  500. }
  501. }
  502. }
  503. free(tpnt->libname);
  504. free(tpnt);
  505. }
  506. }
  507. free(handle->init_fini.init_fini);
  508. free(handle);
  509. if (_dl_debug_addr) {
  510. dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
  511. if (dl_brk != NULL) {
  512. _dl_debug_addr->r_state = RT_DELETE;
  513. (*dl_brk) ();
  514. _dl_debug_addr->r_state = RT_CONSISTENT;
  515. (*dl_brk) ();
  516. }
  517. }
  518. return 0;
  519. }
  520. int dlclose(void *vhandle)
  521. {
  522. return do_dlclose(vhandle, 1);
  523. }
  524. char *dlerror(void)
  525. {
  526. const char *retval;
  527. if (!_dl_error_number)
  528. return NULL;
  529. retval = dl_error_names[_dl_error_number];
  530. _dl_error_number = 0;
  531. return (char *)retval;
  532. }
  533. /*
  534. * Dump information to stderrr about the current loaded modules
  535. */
  536. static char *type[] = { "Lib", "Exe", "Int", "Mod" };
  537. int dlinfo(void)
  538. {
  539. struct elf_resolve *tpnt;
  540. struct dyn_elf *rpnt, *hpnt;
  541. fprintf(stderr, "List of loaded modules\n");
  542. /* First start with a complete list of all of the loaded files. */
  543. for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
  544. fprintf(stderr, "\t%p %p %p %s %d %s\n",
  545. tpnt->loadaddr, tpnt, tpnt->symbol_scope,
  546. type[tpnt->libtype],
  547. tpnt->usage_count, tpnt->libname);
  548. }
  549. /* Next dump the module list for the application itself */
  550. fprintf(stderr, "\nModules for application (%p):\n", _dl_symbol_tables);
  551. for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next)
  552. fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);
  553. for (hpnt = _dl_handles; hpnt; hpnt = hpnt->next_handle) {
  554. fprintf(stderr, "Modules for handle %p\n", hpnt);
  555. for (rpnt = hpnt; rpnt; rpnt = rpnt->next)
  556. fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);
  557. }
  558. return 0;
  559. }
  560. int dladdr(const void *__address, Dl_info * __info)
  561. {
  562. struct elf_resolve *pelf;
  563. struct elf_resolve *rpnt;
  564. _dl_map_cache();
  565. /*
  566. * Try and locate the module address is in
  567. */
  568. pelf = NULL;
  569. #if 0
  570. fprintf(stderr, "dladdr( %p, %p )\n", __address, __info);
  571. #endif
  572. for (rpnt = _dl_loaded_modules; rpnt; rpnt = rpnt->next) {
  573. struct elf_resolve *tpnt;
  574. tpnt = rpnt;
  575. #if 0
  576. fprintf(stderr, "Module \"%s\" at %p\n",
  577. tpnt->libname, tpnt->loadaddr);
  578. #endif
  579. if (tpnt->loadaddr < (ElfW(Addr)) __address
  580. && (pelf == NULL || pelf->loadaddr < tpnt->loadaddr)) {
  581. pelf = tpnt;
  582. }
  583. }
  584. if (!pelf) {
  585. return 0;
  586. }
  587. /*
  588. * Try and locate the symbol of address
  589. */
  590. {
  591. char *strtab;
  592. ElfW(Sym) *symtab;
  593. int hn, si;
  594. int sf;
  595. int sn = 0;
  596. ElfW(Addr) sa;
  597. sa = 0;
  598. symtab = (ElfW(Sym) *) (pelf->dynamic_info[DT_SYMTAB]);
  599. strtab = (char *) (pelf->dynamic_info[DT_STRTAB]);
  600. sf = 0;
  601. for (hn = 0; hn < pelf->nbucket; hn++) {
  602. for (si = pelf->elf_buckets[hn]; si; si = pelf->chains[si]) {
  603. ElfW(Addr) symbol_addr;
  604. symbol_addr = pelf->loadaddr + symtab[si].st_value;
  605. if (symbol_addr <= (ElfW(Addr))__address && (!sf || sa < symbol_addr)) {
  606. sa = symbol_addr;
  607. sn = si;
  608. sf = 1;
  609. }
  610. #if 0
  611. fprintf(stderr, "Symbol \"%s\" at %p\n",
  612. strtab + symtab[si].st_name, symbol_addr);
  613. #endif
  614. }
  615. }
  616. if (sf) {
  617. __info->dli_fname = pelf->libname;
  618. __info->dli_fbase = (void *)pelf->loadaddr;
  619. __info->dli_sname = strtab + symtab[sn].st_name;
  620. __info->dli_saddr = (void *)sa;
  621. }
  622. return 1;
  623. }
  624. }