libdl.c 20 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) 2000-2006 by Erik Andersen <andersen@uclibc.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. #include <ldso.h>
  32. #include <stdio.h>
  33. #ifdef SHARED
  34. /* When libdl is loaded as a shared library, we need to load in
  35. * and use a pile of symbols from ldso... */
  36. extern char *_dl_find_hash(const char *, struct dyn_elf *, struct elf_resolve *, int);
  37. extern struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **,
  38. struct elf_resolve *, char *, int);
  39. extern int _dl_fixup(struct dyn_elf *rpnt, int lazy);
  40. extern void _dl_protect_relro(struct elf_resolve * tpnt);
  41. extern int _dl_errno;
  42. extern struct dyn_elf *_dl_symbol_tables;
  43. extern struct dyn_elf *_dl_handles;
  44. extern struct elf_resolve *_dl_loaded_modules;
  45. extern struct r_debug *_dl_debug_addr;
  46. extern unsigned long _dl_error_number;
  47. extern void *(*_dl_malloc_function)(size_t);
  48. extern void _dl_run_init_array(struct elf_resolve *);
  49. extern void _dl_run_fini_array(struct elf_resolve *);
  50. #ifdef __LDSO_CACHE_SUPPORT__
  51. int _dl_map_cache(void);
  52. int _dl_unmap_cache(void);
  53. #endif
  54. #ifdef __mips__
  55. extern void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt, int lazy);
  56. #endif
  57. #ifdef __SUPPORT_LD_DEBUG__
  58. extern char *_dl_debug;
  59. #endif
  60. #else /* SHARED */
  61. /* When libdl is linked as a static library, we need to replace all
  62. * the symbols that otherwise would have been loaded in from ldso... */
  63. #ifdef __SUPPORT_LD_DEBUG__
  64. char *_dl_debug = 0;
  65. #endif
  66. const char *_dl_progname = ""; /* Program name */
  67. char *_dl_library_path = 0; /* Where we look for libraries */
  68. char *_dl_ldsopath = 0; /* Location of the shared lib loader */
  69. int _dl_errno = 0; /* We can't use the real errno in ldso */
  70. size_t _dl_pagesize = PAGE_SIZE; /* Store the page size for use later */
  71. /* This global variable is also to communicate with debuggers such as gdb. */
  72. struct r_debug *_dl_debug_addr = NULL;
  73. #define _dl_malloc malloc
  74. #include "../ldso/dl-debug.c"
  75. #include LDSO_ELFINTERP
  76. #include "../ldso/dl-hash.c"
  77. #define _dl_trace_loaded_objects 0
  78. #include "../ldso/dl-elf.c"
  79. #endif /* SHARED */
  80. #ifdef __SUPPORT_LD_DEBUG__
  81. # define _dl_if_debug_print(fmt, args...) \
  82. do { \
  83. if (_dl_debug) \
  84. fprintf(stderr, "%s():%i: " fmt, __FUNCTION__, __LINE__, ## args); \
  85. } while (0)
  86. #else
  87. # define _dl_if_debug_print(fmt, args...)
  88. #endif
  89. static int do_dlclose(void *, int need_fini);
  90. static const char *dl_error_names[] = {
  91. "",
  92. "File not found",
  93. "Unable to open /dev/zero",
  94. "Not an ELF file",
  95. #if defined (__i386__)
  96. "Not i386 binary",
  97. #elif defined (__sparc__)
  98. "Not sparc binary",
  99. #elif defined (__mc68000__)
  100. "Not m68k binary",
  101. #else
  102. "Unrecognized binary type",
  103. #endif
  104. "Not an ELF shared library",
  105. "Unable to mmap file",
  106. "No dynamic section",
  107. #ifdef ELF_USES_RELOCA
  108. "Unable to process REL relocs",
  109. #else
  110. "Unable to process RELA relocs",
  111. #endif
  112. "Bad handle",
  113. "Unable to resolve symbol"
  114. };
  115. void dl_cleanup(void) __attribute__ ((destructor));
  116. void dl_cleanup(void)
  117. {
  118. struct dyn_elf *d;
  119. for (d = _dl_handles; d; d = d->next_handle) {
  120. do_dlclose(d, 1);
  121. }
  122. }
  123. void *dlopen(const char *libname, int flag)
  124. {
  125. struct elf_resolve *tpnt, *tfrom;
  126. struct dyn_elf *dyn_chain, *rpnt = NULL, *dyn_ptr, *relro_ptr, *handle;
  127. ElfW(Addr) from;
  128. struct elf_resolve *tpnt1;
  129. void (*dl_brk) (void);
  130. int now_flag;
  131. struct init_fini_list *tmp, *runp, *runp2, *dep_list;
  132. unsigned int nlist, i;
  133. struct elf_resolve **init_fini_list;
  134. /* A bit of sanity checking... */
  135. if (!(flag & (RTLD_LAZY|RTLD_NOW))) {
  136. _dl_error_number = LD_BAD_HANDLE;
  137. return NULL;
  138. }
  139. from = (ElfW(Addr)) __builtin_return_address(0);
  140. /* Cover the trivial case first */
  141. if (!libname)
  142. return _dl_symbol_tables;
  143. _dl_map_cache();
  144. /*
  145. * Try and locate the module we were called from - we
  146. * need this so that we get the correct RPATH/RUNPATH. Note that
  147. * this is the current behavior under Solaris, but the
  148. * ABI+ specifies that we should only use the RPATH from
  149. * the application. Thus this may go away at some time
  150. * in the future.
  151. */
  152. {
  153. struct dyn_elf *dpnt;
  154. tfrom = NULL;
  155. for (dpnt = _dl_symbol_tables; dpnt; dpnt = dpnt->next) {
  156. tpnt = dpnt->dyn;
  157. if (DL_ADDR_IN_LOADADDR(from, tpnt, tfrom))
  158. tfrom = tpnt;
  159. }
  160. }
  161. for(rpnt = _dl_symbol_tables; rpnt && rpnt->next; rpnt=rpnt->next);
  162. relro_ptr = rpnt;
  163. now_flag = (flag & RTLD_NOW) ? RTLD_NOW : 0;
  164. if (getenv("LD_BIND_NOW"))
  165. now_flag = RTLD_NOW;
  166. /* Try to load the specified library */
  167. _dl_if_debug_print("Trying to dlopen '%s', RTLD_GLOBAL:%d RTLD_NOW:%d\n",
  168. (char*)libname, (flag & RTLD_GLOBAL ? 1:0), (now_flag & RTLD_NOW ? 1:0));
  169. tpnt = _dl_load_shared_library(0, &rpnt, tfrom, (char*)libname, 0);
  170. if (tpnt == NULL) {
  171. _dl_unmap_cache();
  172. return NULL;
  173. }
  174. dyn_chain = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
  175. _dl_memset(dyn_chain, 0, sizeof(struct dyn_elf));
  176. dyn_chain->dyn = tpnt;
  177. tpnt->rtld_flags |= (flag & RTLD_GLOBAL);
  178. dyn_chain->next_handle = _dl_handles;
  179. _dl_handles = dyn_ptr = dyn_chain;
  180. if (tpnt->usage_count > 1) {
  181. _dl_if_debug_print("Lib: %s already opened\n", libname);
  182. /* see if there is a handle from a earlier dlopen */
  183. for (handle = _dl_handles->next_handle; handle; handle = handle->next_handle) {
  184. if (handle->dyn == tpnt) {
  185. dyn_chain->init_fini.init_fini = handle->init_fini.init_fini;
  186. dyn_chain->init_fini.nlist = handle->init_fini.nlist;
  187. for(i=0; i < dyn_chain->init_fini.nlist; i++)
  188. dyn_chain->init_fini.init_fini[i]->rtld_flags |= (flag & RTLD_GLOBAL);
  189. dyn_chain->next = handle->next;
  190. break;
  191. }
  192. }
  193. return dyn_chain;
  194. } else {
  195. tpnt->init_flag |= DL_OPENED;
  196. }
  197. _dl_if_debug_print("Looking for needed libraries\n");
  198. nlist = 0;
  199. runp = alloca(sizeof(*runp));
  200. runp->tpnt = tpnt;
  201. runp->next = NULL;
  202. dep_list = runp2 = runp;
  203. for (; runp; runp = runp->next)
  204. {
  205. ElfW(Dyn) *dpnt;
  206. char *lpntstr;
  207. nlist++;
  208. runp->tpnt->init_fini = NULL; /* clear any previous dependcies */
  209. for (dpnt = (ElfW(Dyn) *) runp->tpnt->dynamic_addr; dpnt->d_tag; dpnt++) {
  210. if (dpnt->d_tag == DT_NEEDED) {
  211. lpntstr = (char*) (runp->tpnt->dynamic_info[DT_STRTAB] +
  212. dpnt->d_un.d_val);
  213. _dl_if_debug_print("Trying to load '%s', needed by '%s'\n",
  214. lpntstr, runp->tpnt->libname);
  215. tpnt1 = _dl_load_shared_library(0, &rpnt, runp->tpnt, lpntstr, 0);
  216. if (!tpnt1)
  217. goto oops;
  218. tpnt1->rtld_flags |= (flag & RTLD_GLOBAL);
  219. if (tpnt1->usage_count == 1) {
  220. tpnt1->init_flag |= DL_OPENED;
  221. /* This list is for dlsym() and relocation */
  222. dyn_ptr->next = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
  223. _dl_memset (dyn_ptr->next, 0, sizeof (struct dyn_elf));
  224. dyn_ptr = dyn_ptr->next;
  225. dyn_ptr->dyn = tpnt1;
  226. }
  227. if (tpnt1->init_flag & DL_OPENED) {
  228. /* Used to record RTLD_LOCAL scope */
  229. tmp = alloca(sizeof(struct init_fini_list));
  230. tmp->tpnt = tpnt1;
  231. tmp->next = runp->tpnt->init_fini;
  232. runp->tpnt->init_fini = tmp;
  233. for (tmp=dep_list; tmp; tmp = tmp->next) {
  234. if (tpnt1 == tmp->tpnt) { /* if match => cirular dependency, drop it */
  235. _dl_if_debug_print("Circular dependency, skipping '%s',\n",
  236. tmp->tpnt->libname);
  237. tpnt1->usage_count--;
  238. break;
  239. }
  240. }
  241. if (!tmp) { /* Don't add if circular dependency detected */
  242. runp2->next = alloca(sizeof(*runp));
  243. runp2 = runp2->next;
  244. runp2->tpnt = tpnt1;
  245. runp2->next = NULL;
  246. }
  247. }
  248. }
  249. }
  250. }
  251. init_fini_list = malloc(nlist * sizeof(struct elf_resolve *));
  252. dyn_chain->init_fini.init_fini = init_fini_list;
  253. dyn_chain->init_fini.nlist = nlist;
  254. i = 0;
  255. for (runp2 = dep_list; runp2; runp2 = runp2->next) {
  256. init_fini_list[i++] = runp2->tpnt;
  257. for(runp = runp2->tpnt->init_fini; runp; runp = runp->next){
  258. if (!(runp->tpnt->rtld_flags & RTLD_GLOBAL)) {
  259. tmp = malloc(sizeof(struct init_fini_list));
  260. tmp->tpnt = runp->tpnt;
  261. tmp->next = runp2->tpnt->rtld_local;
  262. runp2->tpnt->rtld_local = tmp;
  263. }
  264. }
  265. }
  266. /* Sort the INIT/FINI list in dependency order. */
  267. for (runp2 = dep_list; runp2; runp2 = runp2->next) {
  268. unsigned int j, k;
  269. for (j = 0; init_fini_list[j] != runp2->tpnt; ++j)
  270. /* Empty */;
  271. for (k = j + 1; k < nlist; ++k) {
  272. struct init_fini_list *ele = init_fini_list[k]->init_fini;
  273. for (; ele; ele = ele->next) {
  274. if (ele->tpnt == runp2->tpnt) {
  275. struct elf_resolve *here = init_fini_list[k];
  276. _dl_if_debug_print("Move %s from pos %d to %d in INIT/FINI list.\n", here->libname, k, j);
  277. for (i = (k - j); i; --i)
  278. init_fini_list[i+j] = init_fini_list[i+j-1];
  279. init_fini_list[j] = here;
  280. ++j;
  281. break;
  282. }
  283. }
  284. }
  285. }
  286. #ifdef __SUPPORT_LD_DEBUG__
  287. if(_dl_debug) {
  288. fprintf(stderr, "\nINIT/FINI order and dependencies:\n");
  289. for (i=0;i < nlist;i++) {
  290. fprintf(stderr, "lib: %s has deps:\n", init_fini_list[i]->libname);
  291. runp = init_fini_list[i]->init_fini;
  292. for (; runp; runp = runp->next)
  293. printf(" %s ", runp->tpnt->libname);
  294. printf("\n");
  295. }
  296. }
  297. #endif
  298. _dl_if_debug_print("Beginning dlopen relocation fixups\n");
  299. /*
  300. * OK, now all of the kids are tucked into bed in their proper addresses.
  301. * Now we go through and look for REL and RELA records that indicate fixups
  302. * to the GOT tables. We need to do this in reverse order so that COPY
  303. * directives work correctly */
  304. #ifdef __mips__
  305. /*
  306. * Relocation of the GOT entries for MIPS have to be done
  307. * after all the libraries have been loaded.
  308. */
  309. _dl_perform_mips_global_got_relocations(tpnt, !now_flag);
  310. #endif
  311. if (_dl_fixup(dyn_chain, now_flag))
  312. goto oops;
  313. if (relro_ptr) {
  314. for (rpnt = relro_ptr->next; rpnt; rpnt = rpnt->next) {
  315. if (rpnt->dyn->relro_size)
  316. _dl_protect_relro(rpnt->dyn);
  317. }
  318. }
  319. /* TODO: Should we set the protections of all pages back to R/O now ? */
  320. /* Notify the debugger we have added some objects. */
  321. if (_dl_debug_addr) {
  322. dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
  323. if (dl_brk != NULL) {
  324. _dl_debug_addr->r_state = RT_ADD;
  325. (*dl_brk) ();
  326. _dl_debug_addr->r_state = RT_CONSISTENT;
  327. (*dl_brk) ();
  328. }
  329. }
  330. #ifdef SHARED
  331. /* Run the ctors and setup the dtors */
  332. for (i = nlist; i; --i) {
  333. tpnt = init_fini_list[i-1];
  334. if (tpnt->init_flag & INIT_FUNCS_CALLED)
  335. continue;
  336. tpnt->init_flag |= INIT_FUNCS_CALLED;
  337. if (tpnt->dynamic_info[DT_INIT]) {
  338. void (*dl_elf_func) (void);
  339. dl_elf_func = (void (*)(void)) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_INIT]);
  340. if (dl_elf_func) {
  341. _dl_if_debug_print("running ctors for library %s at '%p'\n",
  342. tpnt->libname, dl_elf_func);
  343. DL_CALL_FUNC_AT_ADDR (dl_elf_func, tpnt->loadaddr, (void(*)(void)));
  344. }
  345. }
  346. _dl_run_init_array(tpnt);
  347. }
  348. #endif /* SHARED */
  349. _dl_unmap_cache();
  350. return (void *) dyn_chain;
  351. oops:
  352. /* Something went wrong. Clean up and return NULL. */
  353. _dl_unmap_cache();
  354. do_dlclose(dyn_chain, 0);
  355. return NULL;
  356. }
  357. void *dlsym(void *vhandle, const char *name)
  358. {
  359. struct elf_resolve *tpnt, *tfrom;
  360. struct dyn_elf *handle;
  361. ElfW(Addr) from;
  362. struct dyn_elf *rpnt;
  363. void *ret;
  364. handle = (struct dyn_elf *) vhandle;
  365. /* First of all verify that we have a real handle
  366. of some kind. Return NULL if not a valid handle. */
  367. if (handle == NULL)
  368. handle = _dl_symbol_tables;
  369. else if (handle != RTLD_NEXT && handle != _dl_symbol_tables) {
  370. for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle)
  371. if (rpnt == handle)
  372. break;
  373. if (!rpnt) {
  374. _dl_error_number = LD_BAD_HANDLE;
  375. return NULL;
  376. }
  377. } else if (handle == RTLD_NEXT) {
  378. /*
  379. * Try and locate the module we were called from - we
  380. * need this so that we know where to start searching
  381. * from. We never pass RTLD_NEXT down into the actual
  382. * dynamic loader itself, as it doesn't know
  383. * how to properly treat it.
  384. */
  385. from = (ElfW(Addr)) __builtin_return_address(0);
  386. tfrom = NULL;
  387. for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next) {
  388. tpnt = rpnt->dyn;
  389. if (DL_ADDR_IN_LOADADDR(from, tpnt, tfrom)) {
  390. tfrom = tpnt;
  391. handle = rpnt->next;
  392. }
  393. }
  394. }
  395. ret = _dl_find_hash((char*)name, handle, NULL, 0);
  396. /*
  397. * Nothing found.
  398. */
  399. if (!ret)
  400. _dl_error_number = LD_NO_SYMBOL;
  401. return ret;
  402. }
  403. #if 0
  404. void *dlvsym(void *vhandle, const char *name, const char *version)
  405. {
  406. return dlsym(vhandle, name);
  407. }
  408. #endif
  409. static int do_dlclose(void *vhandle, int need_fini)
  410. {
  411. struct dyn_elf *rpnt, *rpnt1, *rpnt1_tmp;
  412. struct init_fini_list *runp, *tmp;
  413. ElfW(Phdr) *ppnt;
  414. struct elf_resolve *tpnt, *run_tpnt;
  415. int (*dl_elf_fini) (void);
  416. void (*dl_brk) (void);
  417. struct dyn_elf *handle;
  418. unsigned int end;
  419. unsigned int i, j;
  420. handle = (struct dyn_elf *) vhandle;
  421. if (handle == _dl_symbol_tables)
  422. return 0;
  423. rpnt1 = NULL;
  424. for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle) {
  425. if (rpnt == handle)
  426. break;
  427. rpnt1 = rpnt;
  428. }
  429. if (!rpnt) {
  430. _dl_error_number = LD_BAD_HANDLE;
  431. return 1;
  432. }
  433. if (rpnt1)
  434. rpnt1->next_handle = rpnt->next_handle;
  435. else
  436. _dl_handles = rpnt->next_handle;
  437. _dl_if_debug_print("%s: usage count: %d\n",
  438. handle->dyn->libname, handle->dyn->usage_count);
  439. if (handle->dyn->usage_count != 1) {
  440. handle->dyn->usage_count--;
  441. free(handle);
  442. return 0;
  443. }
  444. /* OK, this is a valid handle - now close out the file */
  445. for (j = 0; j < handle->init_fini.nlist; ++j) {
  446. tpnt = handle->init_fini.init_fini[j];
  447. if (--tpnt->usage_count == 0) {
  448. if ((tpnt->dynamic_info[DT_FINI]
  449. || tpnt->dynamic_info[DT_FINI_ARRAY])
  450. && need_fini &&
  451. !(tpnt->init_flag & FINI_FUNCS_CALLED)) {
  452. tpnt->init_flag |= FINI_FUNCS_CALLED;
  453. #ifdef SHARED
  454. _dl_run_fini_array(tpnt);
  455. #endif
  456. if (tpnt->dynamic_info[DT_FINI]) {
  457. dl_elf_fini = (int (*)(void)) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_FINI]);
  458. _dl_if_debug_print("running dtors for library %s at '%p'\n",
  459. tpnt->libname, dl_elf_fini);
  460. DL_CALL_FUNC_AT_ADDR (dl_elf_fini, tpnt->loadaddr, (int (*)(void)));
  461. }
  462. }
  463. _dl_if_debug_print("unmapping: %s\n", tpnt->libname);
  464. end = 0;
  465. for (i = 0, ppnt = tpnt->ppnt;
  466. i < tpnt->n_phent; ppnt++, i++) {
  467. if (ppnt->p_type != PT_LOAD)
  468. continue;
  469. if (end < ppnt->p_vaddr + ppnt->p_memsz)
  470. end = ppnt->p_vaddr + ppnt->p_memsz;
  471. }
  472. _dl_munmap((void*)tpnt->loadaddr, end);
  473. /* Free elements in RTLD_LOCAL scope list */
  474. for (runp = tpnt->rtld_local; runp; runp = tmp) {
  475. tmp = runp->next;
  476. free(runp);
  477. }
  478. /* Next, remove tpnt from the loaded_module list */
  479. if (_dl_loaded_modules == tpnt) {
  480. _dl_loaded_modules = tpnt->next;
  481. if (_dl_loaded_modules)
  482. _dl_loaded_modules->prev = 0;
  483. } else
  484. for (run_tpnt = _dl_loaded_modules; run_tpnt; run_tpnt = run_tpnt->next)
  485. if (run_tpnt->next == tpnt) {
  486. _dl_if_debug_print("removing loaded_modules: %s\n", tpnt->libname);
  487. run_tpnt->next = run_tpnt->next->next;
  488. if (run_tpnt->next)
  489. run_tpnt->next->prev = run_tpnt;
  490. break;
  491. }
  492. /* Next, remove tpnt from the global symbol table list */
  493. if (_dl_symbol_tables) {
  494. if (_dl_symbol_tables->dyn == tpnt) {
  495. _dl_symbol_tables = _dl_symbol_tables->next;
  496. if (_dl_symbol_tables)
  497. _dl_symbol_tables->prev = 0;
  498. } else
  499. for (rpnt1 = _dl_symbol_tables; rpnt1->next; rpnt1 = rpnt1->next) {
  500. if (rpnt1->next->dyn == tpnt) {
  501. _dl_if_debug_print("removing symbol_tables: %s\n", tpnt->libname);
  502. rpnt1_tmp = rpnt1->next->next;
  503. free(rpnt1->next);
  504. rpnt1->next = rpnt1_tmp;
  505. if (rpnt1->next)
  506. rpnt1->next->prev = rpnt1;
  507. break;
  508. }
  509. }
  510. }
  511. free(tpnt->libname);
  512. free(tpnt);
  513. }
  514. }
  515. free(handle->init_fini.init_fini);
  516. free(handle);
  517. if (_dl_debug_addr) {
  518. dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
  519. if (dl_brk != NULL) {
  520. _dl_debug_addr->r_state = RT_DELETE;
  521. (*dl_brk) ();
  522. _dl_debug_addr->r_state = RT_CONSISTENT;
  523. (*dl_brk) ();
  524. }
  525. }
  526. return 0;
  527. }
  528. int dlclose(void *vhandle)
  529. {
  530. return do_dlclose(vhandle, 1);
  531. }
  532. char *dlerror(void)
  533. {
  534. const char *retval;
  535. if (!_dl_error_number)
  536. return NULL;
  537. retval = dl_error_names[_dl_error_number];
  538. _dl_error_number = 0;
  539. return (char *)retval;
  540. }
  541. /*
  542. * Dump information to stderr about the current loaded modules
  543. */
  544. #ifdef __USE_GNU
  545. static char *type[] = { "Lib", "Exe", "Int", "Mod" };
  546. int dlinfo(void)
  547. {
  548. struct elf_resolve *tpnt;
  549. struct dyn_elf *rpnt, *hpnt;
  550. fprintf(stderr, "List of loaded modules\n");
  551. /* First start with a complete list of all of the loaded files. */
  552. for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
  553. fprintf(stderr, "\t%p %p %p %s %d %s\n",
  554. DL_LOADADDR_BASE(tpnt->loadaddr), tpnt, tpnt->symbol_scope,
  555. type[tpnt->libtype],
  556. tpnt->usage_count, tpnt->libname);
  557. }
  558. /* Next dump the module list for the application itself */
  559. fprintf(stderr, "\nModules for application (%p):\n", _dl_symbol_tables);
  560. for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next)
  561. fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);
  562. for (hpnt = _dl_handles; hpnt; hpnt = hpnt->next_handle) {
  563. fprintf(stderr, "Modules for handle %p\n", hpnt);
  564. for (rpnt = hpnt; rpnt; rpnt = rpnt->next)
  565. fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);
  566. }
  567. return 0;
  568. }
  569. int dladdr(const void *__address, Dl_info * __info)
  570. {
  571. struct elf_resolve *pelf;
  572. struct elf_resolve *rpnt;
  573. _dl_map_cache();
  574. /*
  575. * Try and locate the module address is in
  576. */
  577. pelf = NULL;
  578. _dl_if_debug_print("__address: %p __info: %p\n", __address, __info);
  579. for (rpnt = _dl_loaded_modules; rpnt; rpnt = rpnt->next) {
  580. struct elf_resolve *tpnt;
  581. tpnt = rpnt;
  582. _dl_if_debug_print("Module \"%s\" at %p\n",
  583. tpnt->libname, DL_LOADADDR_BASE(tpnt->loadaddr));
  584. if (DL_ADDR_IN_LOADADDR((ElfW(Addr)) __address, tpnt, pelf))
  585. pelf = tpnt;
  586. }
  587. if (!pelf) {
  588. return 0;
  589. }
  590. /*
  591. * Try and locate the symbol of address
  592. */
  593. {
  594. char *strtab;
  595. ElfW(Sym) *symtab;
  596. unsigned int hn, si, sn, sf;
  597. ElfW(Addr) sa;
  598. sa = 0;
  599. symtab = (ElfW(Sym) *) (pelf->dynamic_info[DT_SYMTAB]);
  600. strtab = (char *) (pelf->dynamic_info[DT_STRTAB]);
  601. sf = sn = 0;
  602. for (hn = 0; hn < pelf->nbucket; hn++) {
  603. for (si = pelf->elf_buckets[hn]; si; si = pelf->chains[si]) {
  604. ElfW(Addr) symbol_addr;
  605. symbol_addr = (ElfW(Addr)) DL_RELOC_ADDR(pelf->loadaddr, symtab[si].st_value);
  606. if (symbol_addr <= (ElfW(Addr))__address && (!sf || sa < symbol_addr)) {
  607. sa = symbol_addr;
  608. sn = si;
  609. sf = 1;
  610. }
  611. _dl_if_debug_print("Symbol \"%s\" at %p\n",
  612. strtab + symtab[si].st_name, symbol_addr);
  613. }
  614. }
  615. if (sf) {
  616. __info->dli_fname = pelf->libname;
  617. __info->dli_fbase = (void *) DL_LOADADDR_BASE(pelf->loadaddr);
  618. __info->dli_sname = strtab + symtab[sn].st_name;
  619. __info->dli_saddr = (void *)sa;
  620. }
  621. return 1;
  622. }
  623. }
  624. #endif