e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | This library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with this library; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
23 | |
24 | #ifdef SDL_LOADSO_DLCOMPAT |
25 | |
26 | /* Please note that dlcompat apparently ships in current Mac OS X versions |
27 | * as a system library that provides compatibility with the Unix "dlopen" |
28 | * interface. In order to allow SDL to work on older OS X releases and also |
29 | * not conflict with the system lib on newer versions, we include dlcompat |
30 | * in SDL and change the symbols to prevent symbol clash with any existing |
31 | * system libraries. --ryan. |
32 | */ |
33 | |
34 | /* here is the dlcompat license: */ |
35 | |
36 | /* |
37 | Copyright (c) 2002 Jorge Acereda <jacereda@users.sourceforge.net> & |
38 | Peter O'Gorman <ogorman@users.sourceforge.net> |
39 | |
40 | Portions may be copyright others, see the AUTHORS file included with this |
41 | distribution. |
42 | |
43 | Maintained by Peter O'Gorman <ogorman@users.sourceforge.net> |
44 | |
45 | Bug Reports and other queries should go to <ogorman@users.sourceforge.net> |
46 | |
47 | Permission is hereby granted, free of charge, to any person obtaining |
48 | a copy of this software and associated documentation files (the |
49 | "Software"), to deal in the Software without restriction, including |
50 | without limitation the rights to use, copy, modify, merge, publish, |
51 | distribute, sublicense, and/or sell copies of the Software, and to |
52 | permit persons to whom the Software is furnished to do so, subject to |
53 | the following conditions: |
54 | |
55 | The above copyright notice and this permission notice shall be |
56 | included in all copies or substantial portions of the Software. |
57 | |
58 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
59 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
60 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
61 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
62 | LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
63 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
64 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
65 | */ |
66 | |
67 | #include <pthread.h> |
68 | #include <sys/types.h> |
69 | #include <sys/stat.h> |
70 | #include <stdarg.h> |
71 | #include <limits.h> |
72 | #include <mach-o/dyld.h> |
73 | #include <mach-o/nlist.h> |
74 | #include <mach-o/getsect.h> |
75 | |
76 | #include "SDL_stdinc.h" |
77 | |
78 | /* Just playing to see if it would compile with the freebsd headers, it does, |
79 | * but because of the different values for RTLD_LOCAL etc, it would break binary |
80 | * compat... oh well |
81 | */ |
82 | #ifndef __BSD_VISIBLE |
83 | #define __BSD_VISIBLE 1 |
84 | #endif |
85 | |
86 | /*include "dlfcn.h"*/ |
87 | #ifdef __cplusplus |
88 | extern "C" { |
89 | #endif |
90 | |
91 | #if defined (__GNUC__) && __GNUC__ > 3 |
92 | #define dl_restrict __restrict |
93 | #else |
94 | #define dl_restrict |
95 | #endif |
96 | |
97 | #if 0 |
98 | #ifndef _POSIX_SOURCE |
99 | /* |
100 | * Structure filled in by dladdr(). |
101 | */ |
102 | typedef struct SDL_OSX_dl_info { |
103 | const char *dli_fname; /* Pathname of shared object */ |
104 | void *dli_fbase; /* Base address of shared object */ |
105 | const char *dli_sname; /* Name of nearest symbol */ |
106 | void *dli_saddr; /* Address of nearest symbol */ |
107 | } SDL_OSX_Dl_info; |
108 | |
109 | static int SDL_OSX_dladdr(const void * dl_restrict, SDL_OSX_Dl_info * dl_restrict); |
110 | #endif /* ! _POSIX_SOURCE */ |
111 | #endif /* 0 */ |
112 | |
113 | static int SDL_OSX_dlclose(void * handle); |
114 | static const char * SDL_OSX_dlerror(void); |
115 | static void * SDL_OSX_dlopen(const char *path, int mode); |
116 | static void * SDL_OSX_dlsym(void * dl_restrict handle, const char * dl_restrict symbol); |
117 | |
118 | #define RTLD_LAZY 0x1 |
119 | #define RTLD_NOW 0x2 |
120 | #define RTLD_LOCAL 0x4 |
121 | #define RTLD_GLOBAL 0x8 |
122 | |
123 | #ifndef _POSIX_SOURCE |
124 | #define RTLD_NOLOAD 0x10 |
125 | #define RTLD_NODELETE 0x80 |
126 | |
127 | /* |
128 | * Special handle arguments for SDL_OSX_dlsym(). |
129 | */ |
130 | #define RTLD_NEXT ((void *) -1) /* Search subsequent objects. */ |
131 | #define RTLD_DEFAULT ((void *) -2) /* Use default search algorithm. */ |
132 | #endif /* ! _POSIX_SOURCE */ |
133 | |
134 | #ifdef __cplusplus |
135 | } |
136 | #endif |
137 | |
138 | #ifndef dl_restrict |
139 | #define dl_restrict __restrict |
140 | #endif |
141 | /* This is not available on 10.1 */ |
142 | #ifndef LC_LOAD_WEAK_DYLIB |
143 | #define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD) |
144 | #endif |
145 | |
146 | /* With this stuff here, this thing may actually compile/run on 10.0 systems |
147 | * Not that I have a 10.0 system to test it on anylonger |
148 | */ |
149 | #ifndef LC_REQ_DYLD |
150 | #define LC_REQ_DYLD 0x80000000 |
151 | #endif |
152 | #ifndef NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED |
153 | #define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED 0x4 |
154 | #endif |
155 | #ifndef NSADDIMAGE_OPTION_RETURN_ON_ERROR |
156 | #define NSADDIMAGE_OPTION_RETURN_ON_ERROR 0x1 |
157 | #endif |
158 | #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND |
159 | #define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND 0x0 |
160 | #endif |
161 | #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR |
162 | #define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR 0x4 |
163 | #endif |
164 | /* These symbols will be looked for in dyld */ |
165 | static const struct mach_header *(*dyld_NSAddImage) (const char *, unsigned long) = 0; |
166 | static int (*dyld_NSIsSymbolNameDefinedInImage) (const struct mach_header *, const char *) = 0; |
167 | static NSSymbol(*dyld_NSLookupSymbolInImage) |
168 | (const struct mach_header *, const char *, unsigned long) = 0; |
169 | |
170 | /* Define this to make dlcompat reuse data block. This way in theory we save |
171 | * a little bit of overhead. However we then couldn't correctly catch excess |
172 | * calls to SDL_OSX_dlclose(). Hence we don't use this feature |
173 | */ |
174 | #undef REUSE_STATUS |
175 | |
176 | /* Size of the internal error message buffer (used by dlerror()) */ |
177 | #define ERR_STR_LEN 251 |
178 | |
179 | /* Maximum number of search paths supported by getSearchPath */ |
180 | #define MAX_SEARCH_PATHS 32 |
181 | |
182 | |
183 | #define MAGIC_DYLIB_OFI ((NSObjectFileImage) 'DYOF') |
184 | #define MAGIC_DYLIB_MOD ((NSModule) 'DYMO') |
185 | |
186 | /* internal flags */ |
187 | #define DL_IN_LIST 0x01 |
188 | |
189 | /* our mutex */ |
190 | static pthread_mutex_t dlcompat_mutex; |
191 | /* Our thread specific storage |
192 | */ |
193 | static pthread_key_t dlerror_key; |
194 | |
195 | struct dlthread |
196 | { |
197 | int lockcnt; |
198 | unsigned char errset; |
199 | char errstr[ERR_STR_LEN]; |
200 | }; |
201 | |
202 | /* This is our central data structure. Whenever a module is loaded via |
203 | * SDL_OSX_dlopen(), we create such a struct. |
204 | */ |
205 | struct dlstatus |
206 | { |
207 | struct dlstatus *next; /* pointer to next element in the linked list */ |
208 | NSModule module; |
209 | const struct mach_header *lib; |
210 | int refs; /* reference count */ |
211 | int mode; /* mode in which this module was loaded */ |
212 | dev_t device; |
213 | ino_t inode; |
214 | int flags; /* Any internal flags we may need */ |
215 | }; |
216 | |
217 | /* Head node of the dlstatus list */ |
218 | static struct dlstatus mainStatus = { 0, MAGIC_DYLIB_MOD, NULL, -1, RTLD_GLOBAL, 0, 0, 0 }; |
219 | static struct dlstatus *stqueue = &mainStatus; |
220 | |
221 | |
222 | /* Storage for the last error message (used by dlerror()) */ |
223 | /* static char err_str[ERR_STR_LEN]; */ |
224 | /* static int err_filled = 0; */ |
225 | |
226 | /* Prototypes to internal functions */ |
227 | static void debug(const char *fmt, ...); |
228 | static void error(const char *str, ...); |
229 | static const char *safegetenv(const char *s); |
230 | static const char *searchList(void); |
231 | static const char *getSearchPath(int i); |
232 | static const char *getFullPath(int i, const char *file); |
233 | static const struct stat *findFile(const char *file, const char **fullPath); |
234 | static int isValidStatus(struct dlstatus *status); |
235 | static inline int isFlagSet(int mode, int flag); |
236 | static struct dlstatus *lookupStatus(const struct stat *sbuf); |
237 | static void insertStatus(struct dlstatus *dls, const struct stat *sbuf); |
238 | static int promoteLocalToGlobal(struct dlstatus *dls); |
239 | static void *reference(struct dlstatus *dls, int mode); |
240 | static void *dlsymIntern(struct dlstatus *dls, const char *symbol, int canSetError); |
241 | static struct dlstatus *allocStatus(void); |
242 | static struct dlstatus *loadModule(const char *path, const struct stat *sbuf, int mode); |
243 | static NSSymbol search_linked_libs(const struct mach_header *mh, const char *symbol); |
244 | static const char *get_lib_name(const struct mach_header *mh); |
245 | static const struct mach_header *get_mach_header_from_NSModule(NSModule mod); |
246 | static void dlcompat_init_func(void); |
247 | static inline void dlcompat_init_check(void); |
248 | static inline void dolock(void); |
249 | static inline void dounlock(void); |
250 | static void dlerrorfree(void *data); |
251 | static void resetdlerror(void); |
252 | static const struct mach_header *my_find_image(const char *name); |
253 | static const struct mach_header *image_for_address(const void *address); |
254 | static inline char *dyld_error_str(void); |
255 | |
256 | #if FINK_BUILD |
257 | /* Two Global Functions */ |
258 | static void *dlsym_prepend_underscore(void *handle, const char *symbol); |
259 | static void *dlsym_auto_underscore(void *handle, const char *symbol); |
260 | |
261 | /* And their _intern counterparts */ |
262 | static void *dlsym_prepend_underscore_intern(void *handle, const char *symbol); |
263 | static void *dlsym_auto_underscore_intern(void *handle, const char *symbol); |
264 | #endif |
265 | |
266 | /* Functions */ |
267 | |
268 | static void debug(const char *fmt, ...) |
269 | { |
270 | #if DEBUG > 1 |
271 | va_list arg; |
272 | va_start(arg, fmt); |
273 | fprintf(stderr, "DLDEBUG: "); |
274 | vfprintf(stderr, fmt, arg); |
275 | fprintf(stderr, "\n"); |
276 | fflush(stderr); |
277 | va_end(arg); |
278 | #endif |
279 | } |
280 | |
281 | static void error(const char *str, ...) |
282 | { |
283 | va_list arg; |
284 | struct dlthread *tss; |
285 | char * err_str; |
286 | va_start(arg, str); |
287 | tss = pthread_getspecific(dlerror_key); |
288 | err_str = tss->errstr; |
289 | SDL_strlcpy(err_str, "dlcompat: ", ERR_STR_LEN); |
290 | vsnprintf(err_str + 10, ERR_STR_LEN - 10, str, arg); |
291 | va_end(arg); |
292 | debug("ERROR: %s\n", err_str); |
293 | tss->errset = 1; |
294 | } |
295 | |
296 | static void warning(const char *str) |
297 | { |
298 | #if DEBUG > 0 |
299 | fprintf(stderr, "WARNING: dlcompat: %s\n", str); |
300 | #endif |
301 | } |
302 | |
303 | static const char *safegetenv(const char *s) |
304 | { |
305 | const char *ss = SDL_getenv(s); |
306 | return ss ? ss : ""; |
307 | } |
308 | |
309 | /* because this is only used for debugging and error reporting functions, we |
310 | * don't really care about how elegant it is... it could use the load |
311 | * commands to find the install name of the library, but... |
312 | */ |
313 | static const char *get_lib_name(const struct mach_header *mh) |
314 | { |
315 | unsigned long count = _dyld_image_count(); |
316 | unsigned long i; |
317 | const char *val = NULL; |
318 | if (mh) |
319 | { |
320 | for (i = 0; i < count; i++) |
321 | { |
322 | if (mh == _dyld_get_image_header(i)) |
323 | { |
324 | val = _dyld_get_image_name(i); |
325 | break; |
326 | } |
327 | } |
328 | } |
329 | return val; |
330 | } |
331 | |
332 | /* Returns the mach_header for the module bu going through all the loaded images |
333 | * and finding the one with the same name as the module. There really ought to be |
334 | * an api for doing this, would be faster, but there isn't one right now |
335 | */ |
336 | static const struct mach_header *get_mach_header_from_NSModule(NSModule mod) |
337 | { |
338 | const char *mod_name = NSNameOfModule(mod); |
339 | const struct mach_header *mh = NULL; |
340 | unsigned long count = _dyld_image_count(); |
341 | unsigned long i; |
342 | debug("Module name: %s", mod_name); |
343 | for (i = 0; i < count; i++) |
344 | { |
345 | if (!SDL_strcmp(mod_name, _dyld_get_image_name(i))) |
346 | { |
347 | mh = _dyld_get_image_header(i); |
348 | break; |
349 | } |
350 | } |
351 | return mh; |
352 | } |
353 | |
354 | |
355 | /* Compute and return a list of all directories that we should search when |
356 | * trying to locate a module. We first look at the values of LD_LIBRARY_PATH |
357 | * and DYLD_LIBRARY_PATH, and then finally fall back to looking into |
358 | * /usr/lib and /lib. Since both of the environments variables can contain a |
359 | * list of colon seperated paths, we simply concat them and the two other paths |
360 | * into one big string, which we then can easily parse. |
361 | * Splitting this string into the actual path list is done by getSearchPath() |
362 | */ |
363 | static const char *searchList() |
364 | { |
365 | size_t buf_size; |
366 | static char *buf=NULL; |
367 | const char *ldlp = safegetenv("LD_LIBRARY_PATH"); |
368 | const char *dyldlp = safegetenv("DYLD_LIBRARY_PATH"); |
369 | const char *stdpath = SDL_getenv("DYLD_FALLBACK_LIBRARY_PATH"); |
370 | if (!stdpath) |
371 | stdpath = "/usr/local/lib:/lib:/usr/lib"; |
372 | if (!buf) |
373 | { |
374 | buf_size = SDL_strlen(ldlp) + SDL_strlen(dyldlp) + SDL_strlen(stdpath) + 4; |
375 | buf = SDL_malloc(buf_size); |
376 | SDL_snprintf(buf, buf_size, "%s%s%s%s%s%c", dyldlp, (dyldlp[0] ? ":" : ""), ldlp, (ldlp[0] ? ":" : ""), |
377 | stdpath, '\0'); |
378 | } |
379 | return buf; |
380 | } |
381 | |
382 | /* Returns the ith search path from the list as computed by searchList() */ |
383 | static const char *getSearchPath(int i) |
384 | { |
385 | static const char *list = 0; |
386 | static char **path = (char **)0; |
387 | static int end = 0; |
388 | static int numsize = MAX_SEARCH_PATHS; |
389 | static char **tmp; |
390 | /* So we can call SDL_free() in the "destructor" we use i=-1 to return the alloc'd array */ |
391 | if (i == -1) |
392 | { |
393 | return (const char*)path; |
394 | } |
395 | if (!path) |
396 | { |
397 | path = (char **)SDL_calloc(MAX_SEARCH_PATHS, sizeof(char **)); |
398 | } |
399 | if (!list && !end) |
400 | list = searchList(); |
401 | if (i >= (numsize)) |
402 | { |
403 | debug("Increasing size for long PATH"); |
404 | tmp = (char **)SDL_calloc((MAX_SEARCH_PATHS + numsize), sizeof(char **)); |
405 | if (tmp) |
406 | { |
407 | SDL_memcpy(tmp, path, sizeof(char **) * numsize); |
408 | SDL_free(path); |
409 | path = tmp; |
410 | numsize += MAX_SEARCH_PATHS; |
411 | } |
412 | else |
413 | { |
414 | return 0; |
415 | } |
416 | } |
417 | |
418 | while (!path[i] && !end) |
419 | { |
420 | path[i] = strsep((char **)&list, ":"); |
421 | |
422 | if (path[i][0] == 0) |
423 | path[i] = 0; |
424 | end = (list == 0); |
425 | } |
426 | return path[i]; |
427 | } |
428 | |
429 | static const char *getFullPath(int i, const char *file) |
430 | { |
431 | static char buf[PATH_MAX]; |
432 | const char *path = getSearchPath(i); |
433 | if (path) |
434 | { |
435 | SDL_snprintf(buf, PATH_MAX, "%s/%s", path, file); |
436 | } |
437 | return path ? buf : 0; |
438 | } |
439 | |
440 | /* Given a file name, try to determine the full path for that file. Starts |
441 | * its search in the current directory, and then tries all paths in the |
442 | * search list in the order they are specified there. |
443 | */ |
444 | static const struct stat *findFile(const char *file, const char **fullPath) |
445 | { |
446 | int i = 0; |
447 | static struct stat sbuf; |
448 | char *fileName; |
449 | debug("finding file %s", file); |
450 | *fullPath = file; |
451 | if (0 == stat(file, &sbuf)) |
452 | return &sbuf; |
453 | if (SDL_strchr(file, '/')) |
454 | return 0; /* If the path had a / we don't look in env var places */ |
455 | fileName = NULL; |
456 | if (!fileName) |
457 | fileName = (char *)file; |
458 | while ((*fullPath = getFullPath(i++, fileName))) |
459 | { |
460 | if (0 == stat(*fullPath, &sbuf)) |
461 | return &sbuf; |
462 | } |
463 | ; |
464 | return 0; |
465 | } |
466 | |
467 | /* Determine whether a given dlstatus is valid or not */ |
468 | static int isValidStatus(struct dlstatus *status) |
469 | { |
470 | /* Walk the list to verify status is contained in it */ |
471 | struct dlstatus *dls = stqueue; |
472 | while (dls && status != dls) |
473 | dls = dls->next; |
474 | if (dls == 0) |
475 | error("invalid handle"); |
476 | else if ((dls->module == 0) || (dls->refs == 0)) |
477 | error("handle to closed library"); |
478 | else |
479 | return TRUE; |
480 | return FALSE; |
481 | } |
482 | |
483 | static inline int isFlagSet(int mode, int flag) |
484 | { |
485 | return (mode & flag) == flag; |
486 | } |
487 | |
488 | static struct dlstatus *lookupStatus(const struct stat *sbuf) |
489 | { |
490 | struct dlstatus *dls = stqueue; |
491 | debug("looking for status"); |
492 | while (dls && ( /* isFlagSet(dls->mode, RTLD_UNSHARED) */ 0 |
493 | || sbuf->st_dev != dls->device || sbuf->st_ino != dls->inode)) |
494 | dls = dls->next; |
495 | return dls; |
496 | } |
497 | |
498 | static void insertStatus(struct dlstatus *dls, const struct stat *sbuf) |
499 | { |
500 | debug("inserting status"); |
501 | dls->inode = sbuf->st_ino; |
502 | dls->device = sbuf->st_dev; |
503 | dls->refs = 0; |
504 | dls->mode = 0; |
505 | if ((dls->flags & DL_IN_LIST) == 0) |
506 | { |
507 | dls->next = stqueue; |
508 | stqueue = dls; |
509 | dls->flags |= DL_IN_LIST; |
510 | } |
511 | } |
512 | |
513 | static struct dlstatus *allocStatus() |
514 | { |
515 | struct dlstatus *dls; |
516 | #ifdef REUSE_STATUS |
517 | dls = stqueue; |
518 | while (dls && dls->module) |
519 | dls = dls->next; |
520 | if (!dls) |
521 | #endif |
522 | dls = SDL_calloc(sizeof(*dls),1); |
523 | return dls; |
524 | } |
525 | |
526 | static int promoteLocalToGlobal(struct dlstatus *dls) |
527 | { |
528 | static int (*p) (NSModule module) = 0; |
529 | debug("promoting"); |
530 | if (!p) |
531 | _dyld_func_lookup("__dyld_NSMakePrivateModulePublic", (void **)&p); |
532 | return (dls->module == MAGIC_DYLIB_MOD) || (p && p(dls->module)); |
533 | } |
534 | |
535 | static void *reference(struct dlstatus *dls, int mode) |
536 | { |
537 | if (dls) |
538 | { |
539 | if (dls->module == MAGIC_DYLIB_MOD && isFlagSet(mode, RTLD_LOCAL)) |
540 | { |
541 | warning("trying to open a .dylib with RTLD_LOCAL"); |
542 | error("unable to open a .dylib with RTLD_LOCAL"); |
543 | return NULL; |
544 | } |
545 | if (isFlagSet(mode, RTLD_GLOBAL) && |
546 | !isFlagSet(dls->mode, RTLD_GLOBAL) && !promoteLocalToGlobal(dls)) |
547 | { |
548 | error("unable to promote local module to global"); |
549 | return NULL; |
550 | } |
551 | dls->mode |= mode; |
552 | dls->refs++; |
553 | } |
554 | else |
555 | debug("reference called with NULL argument"); |
556 | |
557 | return dls; |
558 | } |
559 | |
560 | static const struct mach_header *my_find_image(const char *name) |
561 | { |
562 | const struct mach_header *mh = 0; |
563 | const char *id = NULL; |
564 | int i = _dyld_image_count(); |
565 | int j; |
566 | mh = (struct mach_header *) |
567 | dyld_NSAddImage(name, NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED | |
568 | NSADDIMAGE_OPTION_RETURN_ON_ERROR); |
569 | if (!mh) |
570 | { |
571 | for (j = 0; j < i; j++) |
572 | { |
573 | id = _dyld_get_image_name(j); |
574 | if (!SDL_strcmp(id, name)) |
575 | { |
576 | mh = _dyld_get_image_header(j); |
577 | break; |
578 | } |
579 | } |
580 | } |
581 | return mh; |
582 | } |
583 | |
584 | /* |
585 | * dyld adds libraries by first adding the directly dependant libraries in link order, and |
586 | * then adding the dependencies for those libraries, so we should do the same... but we don't |
587 | * bother adding the extra dependencies, if the symbols are neither in the loaded image nor |
588 | * any of it's direct dependencies, then it probably isn't there. |
589 | */ |
590 | static NSSymbol search_linked_libs(const struct mach_header * mh, const char *symbol) |
591 | { |
592 | unsigned int n; |
593 | struct load_command *lc = 0; |
594 | struct mach_header *wh; |
595 | NSSymbol nssym = 0; |
596 | if (dyld_NSAddImage && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage) |
597 | { |
598 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
599 | for (n = 0; n < mh->ncmds; n++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
600 | { |
601 | if ((LC_LOAD_DYLIB == lc->cmd) || (LC_LOAD_WEAK_DYLIB == lc->cmd)) |
602 | { |
603 | if ((wh = (struct mach_header *) |
604 | my_find_image((char *)(((struct dylib_command *)lc)->dylib.name.offset + |
605 | (char *)lc)))) |
606 | { |
607 | if (dyld_NSIsSymbolNameDefinedInImage(wh, symbol)) |
608 | { |
609 | nssym = dyld_NSLookupSymbolInImage(wh, |
610 | symbol, |
611 | NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | |
612 | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); |
613 | break; |
614 | } |
615 | } |
616 | } |
617 | } |
618 | if ((!nssym) && NSIsSymbolNameDefined(symbol)) |
619 | { |
620 | /* I've never seen this debug message...*/ |
621 | debug("Symbol \"%s\" is defined but was not found", symbol); |
622 | } |
623 | } |
624 | return nssym; |
625 | } |
626 | |
627 | /* Up to the caller to SDL_free() returned string */ |
628 | static inline char *dyld_error_str() |
629 | { |
630 | NSLinkEditErrors dylder; |
631 | int dylderno; |
632 | const char *dylderrstr; |
633 | const char *dyldfile; |
634 | char* retStr = NULL; |
635 | NSLinkEditError(&dylder, &dylderno, &dyldfile, &dylderrstr); |
636 | if (dylderrstr && *dylderrstr) |
637 | { |
638 | retStr = SDL_strdup(dylderrstr); |
639 | } |
640 | return retStr; |
641 | } |
642 | |
643 | static void *dlsymIntern(struct dlstatus *dls, const char *symbol, int canSetError) |
644 | { |
645 | NSSymbol nssym = 0; |
646 | #ifdef __GCC__ |
647 | void *caller = __builtin_return_address(1); /* Be *very* careful about inlining */ |
648 | #else |
649 | void *caller = NULL; |
650 | #endif |
651 | const struct mach_header *caller_mh = 0; |
652 | char *savedErrorStr = NULL; |
653 | resetdlerror(); |
654 | #ifndef RTLD_SELF |
655 | #define RTLD_SELF ((void *) -3) |
656 | #endif |
657 | if (NULL == dls) |
658 | dls = RTLD_SELF; |
659 | if ((RTLD_NEXT == dls) || (RTLD_SELF == dls)) |
660 | { |
661 | if (dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage && caller) |
662 | { |
663 | caller_mh = image_for_address(caller); |
664 | if (RTLD_SELF == dls) |
665 | { |
666 | /* FIXME: We should be using the NSModule api, if SELF is an MH_BUNDLE |
667 | * But it appears to work anyway, and looking at the code in dyld_libfuncs.c |
668 | * this is acceptable. |
669 | */ |
670 | if (dyld_NSIsSymbolNameDefinedInImage(caller_mh, symbol)) |
671 | { |
672 | nssym = dyld_NSLookupSymbolInImage(caller_mh, |
673 | symbol, |
674 | NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | |
675 | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); |
676 | } |
677 | } |
678 | if (!nssym) |
679 | { |
680 | if (RTLD_SELF == dls) |
681 | savedErrorStr = dyld_error_str(); |
682 | nssym = search_linked_libs(caller_mh, symbol); |
683 | } |
684 | } |
685 | else |
686 | { |
687 | if (canSetError) |
688 | error("RTLD_SELF and RTLD_NEXT are not supported"); |
689 | return NULL; |
690 | } |
691 | } |
692 | if (!nssym) |
693 | { |
694 | |
695 | if (RTLD_DEFAULT == dls) |
696 | { |
697 | dls = &mainStatus; |
698 | } |
699 | if (!isValidStatus(dls)) |
700 | return NULL; |
701 | |
702 | if (dls->module != MAGIC_DYLIB_MOD) |
703 | { |
704 | nssym = NSLookupSymbolInModule(dls->module, symbol); |
705 | if (!nssym && NSIsSymbolNameDefined(symbol)) |
706 | { |
707 | debug("Searching dependencies"); |
708 | savedErrorStr = dyld_error_str(); |
709 | nssym = search_linked_libs(get_mach_header_from_NSModule(dls->module), symbol); |
710 | } |
711 | } |
712 | else if (dls->lib && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage) |
713 | { |
714 | if (dyld_NSIsSymbolNameDefinedInImage(dls->lib, symbol)) |
715 | { |
716 | nssym = dyld_NSLookupSymbolInImage(dls->lib, |
717 | symbol, |
718 | NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | |
719 | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); |
720 | } |
721 | else if (NSIsSymbolNameDefined(symbol)) |
722 | { |
723 | debug("Searching dependencies"); |
724 | savedErrorStr = dyld_error_str(); |
725 | nssym = search_linked_libs(dls->lib, symbol); |
726 | } |
727 | } |
728 | else if (dls->module == MAGIC_DYLIB_MOD) |
729 | { |
730 | /* Global context, use NSLookupAndBindSymbol */ |
731 | if (NSIsSymbolNameDefined(symbol)) |
732 | { |
733 | /* There doesn't seem to be a return on error option for this call??? |
734 | this is potentially broken, if binding fails, it will improperly |
735 | exit the application. */ |
736 | nssym = NSLookupAndBindSymbol(symbol); |
737 | } |
738 | else |
739 | { |
740 | if (savedErrorStr) |
741 | SDL_free(savedErrorStr); |
742 | savedErrorStr = SDL_malloc(256); |
743 | SDL_snprintf(savedErrorStr, 256, "Symbol \"%s\" not in global context",symbol); |
744 | } |
745 | } |
746 | } |
747 | /* Error reporting */ |
748 | if (!nssym) |
749 | { |
750 | if (!savedErrorStr || !SDL_strlen(savedErrorStr)) |
751 | { |
752 | if (savedErrorStr) |
753 | SDL_free(savedErrorStr); |
754 | savedErrorStr = SDL_malloc(256); |
755 | SDL_snprintf(savedErrorStr, 256,"Symbol \"%s\" not found",symbol); |
756 | } |
757 | if (canSetError) |
758 | { |
759 | error(savedErrorStr); |
760 | } |
761 | else |
762 | { |
763 | debug(savedErrorStr); |
764 | } |
765 | if (savedErrorStr) |
766 | SDL_free(savedErrorStr); |
767 | return NULL; |
768 | } |
769 | return NSAddressOfSymbol(nssym); |
770 | } |
771 | |
772 | static struct dlstatus *loadModule(const char *path, const struct stat *sbuf, int mode) |
773 | { |
774 | NSObjectFileImage ofi = 0; |
775 | NSObjectFileImageReturnCode ofirc; |
776 | struct dlstatus *dls; |
777 | NSLinkEditErrors ler; |
778 | int lerno; |
779 | const char *errstr; |
780 | const char *file; |
781 | void (*init) (void); |
782 | |
783 | ofirc = NSCreateObjectFileImageFromFile(path, &ofi); |
784 | switch (ofirc) |
785 | { |
786 | case NSObjectFileImageSuccess: |
787 | break; |
788 | case NSObjectFileImageInappropriateFile: |
789 | if (dyld_NSAddImage && dyld_NSIsSymbolNameDefinedInImage && dyld_NSLookupSymbolInImage) |
790 | { |
791 | if (isFlagSet(mode, RTLD_LOCAL)) |
792 | { |
793 | warning("trying to open a .dylib with RTLD_LOCAL"); |
794 | error("unable to open this file with RTLD_LOCAL"); |
795 | return NULL; |
796 | } |
797 | } |
798 | else |
799 | { |
800 | error("opening this file is unsupported on this system"); |
801 | return NULL; |
802 | } |
803 | break; |
804 | case NSObjectFileImageFailure: |
805 | error("object file setup failure"); |
806 | return NULL; |
807 | case NSObjectFileImageArch: |
808 | error("no object for this architecture"); |
809 | return NULL; |
810 | case NSObjectFileImageFormat: |
811 | error("bad object file format"); |
812 | return NULL; |
813 | case NSObjectFileImageAccess: |
814 | error("can't read object file"); |
815 | return NULL; |
816 | default: |
817 | error("unknown error from NSCreateObjectFileImageFromFile()"); |
818 | return NULL; |
819 | } |
820 | dls = lookupStatus(sbuf); |
821 | if (!dls) |
822 | { |
823 | dls = allocStatus(); |
824 | } |
825 | if (!dls) |
826 | { |
827 | error("unable to allocate memory"); |
828 | return NULL; |
829 | } |
830 | // dls->lib = 0; |
831 | if (ofirc == NSObjectFileImageInappropriateFile) |
832 | { |
833 | if ((dls->lib = dyld_NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR))) |
834 | { |
835 | debug("Dynamic lib loaded at %ld", dls->lib); |
836 | ofi = MAGIC_DYLIB_OFI; |
837 | dls->module = MAGIC_DYLIB_MOD; |
838 | ofirc = NSObjectFileImageSuccess; |
839 | /* Although it is possible with a bit of work to modify this so it works and |
840 | functions with RTLD_NOW, I don't deem it necessary at the moment */ |
841 | } |
842 | if (!(dls->module)) |
843 | { |
844 | NSLinkEditError(&ler, &lerno, &file, &errstr); |
845 | if (!errstr || (!SDL_strlen(errstr))) |
846 | error("Can't open this file type"); |
847 | else |
848 | error(errstr); |
849 | if ((dls->flags & DL_IN_LIST) == 0) |
850 | { |
851 | SDL_free(dls); |
852 | } |
853 | return NULL; |
854 | } |
855 | } |
856 | else |
857 | { |
858 | dls->module = NSLinkModule(ofi, path, |
859 | NSLINKMODULE_OPTION_RETURN_ON_ERROR | |
860 | NSLINKMODULE_OPTION_PRIVATE | |
861 | (isFlagSet(mode, RTLD_NOW) ? NSLINKMODULE_OPTION_BINDNOW : 0)); |
862 | NSDestroyObjectFileImage(ofi); |
863 | if (dls->module) |
864 | { |
865 | dls->lib = get_mach_header_from_NSModule(dls->module); |
866 | } |
867 | } |
868 | if (!dls->module) |
869 | { |
870 | NSLinkEditError(&ler, &lerno, &file, &errstr); |
871 | if ((dls->flags & DL_IN_LIST) == 0) |
872 | { |
873 | SDL_free(dls); |
874 | } |
875 | error(errstr); |
876 | return NULL; |
877 | } |
878 | |
879 | insertStatus(dls, sbuf); |
880 | dls = reference(dls, mode); |
881 | if ((init = dlsymIntern(dls, "__init", 0))) |
882 | { |
883 | debug("calling _init()"); |
884 | init(); |
885 | } |
886 | return dls; |
887 | } |
888 | |
889 | inline static void dlcompat_init_check(void) |
890 | { |
891 | static pthread_mutex_t l = PTHREAD_MUTEX_INITIALIZER; |
892 | static int init_done = 0; |
893 | |
894 | pthread_mutex_lock(&l); |
895 | if (!init_done) { |
896 | dlcompat_init_func(); |
897 | init_done = 1; |
898 | } |
899 | pthread_mutex_unlock(&l); |
900 | } |
901 | |
902 | static void dlcompat_init_func(void) |
903 | { |
904 | _dyld_func_lookup("__dyld_NSAddImage", (void **)&dyld_NSAddImage); |
905 | _dyld_func_lookup("__dyld_NSIsSymbolNameDefinedInImage", |
906 | (void **)&dyld_NSIsSymbolNameDefinedInImage); |
907 | _dyld_func_lookup("__dyld_NSLookupSymbolInImage", (void **)&dyld_NSLookupSymbolInImage); |
908 | if (pthread_mutex_init(&dlcompat_mutex, NULL)) |
909 | exit(1); |
910 | if (pthread_key_create(&dlerror_key, &dlerrorfree)) |
911 | exit(1); |
912 | } |
913 | |
914 | static void resetdlerror() |
915 | { |
916 | struct dlthread *tss; |
917 | tss = pthread_getspecific(dlerror_key); |
918 | tss->errset = 0; |
919 | } |
920 | |
921 | static void dlerrorfree(void *data) |
922 | { |
923 | SDL_free(data); |
924 | } |
925 | |
926 | /* We kind of want a recursive lock here, but meet a little trouble |
927 | * because they are not available pre OS X 10.2, so we fake it |
928 | * using thread specific storage to keep a lock count |
929 | */ |
930 | static inline void dolock(void) |
931 | { |
932 | int err = 0; |
933 | struct dlthread *tss; |
934 | dlcompat_init_check(); |
935 | tss = pthread_getspecific(dlerror_key); |
936 | if (!tss) |
937 | { |
938 | tss = SDL_malloc(sizeof(struct dlthread)); |
939 | tss->lockcnt = 0; |
940 | tss->errset = 0; |
941 | if (pthread_setspecific(dlerror_key, tss)) |
942 | { |
943 | fprintf(stderr,"dlcompat: pthread_setspecific failed\n"); |
944 | exit(1); |
945 | } |
946 | } |
947 | if (!tss->lockcnt) |
948 | err = pthread_mutex_lock(&dlcompat_mutex); |
949 | tss->lockcnt = tss->lockcnt +1; |
950 | if (err) |
951 | exit(err); |
952 | } |
953 | |
954 | static inline void dounlock(void) |
955 | { |
956 | int err = 0; |
957 | struct dlthread *tss; |
958 | tss = pthread_getspecific(dlerror_key); |
959 | tss->lockcnt = tss->lockcnt -1; |
960 | if (!tss->lockcnt) |
961 | err = pthread_mutex_unlock(&dlcompat_mutex); |
962 | if (err) |
963 | exit(err); |
964 | } |
965 | |
966 | static void *SDL_OSX_dlopen(const char *path, int mode) |
967 | { |
968 | const struct stat *sbuf; |
969 | struct dlstatus *dls; |
970 | const char *fullPath; |
971 | |
972 | dolock(); |
973 | resetdlerror(); |
974 | if (!path) |
975 | { |
976 | dls = &mainStatus; |
977 | goto dlopenok; |
978 | } |
979 | if (!(sbuf = findFile(path, &fullPath))) |
980 | { |
981 | error("file \"%s\" not found", path); |
982 | goto dlopenerror; |
983 | } |
984 | /* Now checks that it hasn't been closed already */ |
985 | if ((dls = lookupStatus(sbuf)) && (dls->refs > 0)) |
986 | { |
987 | /* debug("status found"); */ |
988 | dls = reference(dls, mode); |
989 | goto dlopenok; |
990 | } |
991 | #ifdef RTLD_NOLOAD |
992 | if (isFlagSet(mode, RTLD_NOLOAD)) |
993 | { |
994 | error("no existing handle and RTLD_NOLOAD specified"); |
995 | goto dlopenerror; |
996 | } |
997 | #endif |
998 | if (isFlagSet(mode, RTLD_LAZY) && isFlagSet(mode, RTLD_NOW)) |
999 | { |
1000 | error("how can I load something both RTLD_LAZY and RTLD_NOW?"); |
1001 | goto dlopenerror; |
1002 | } |
1003 | dls = loadModule(fullPath, sbuf, mode); |
1004 | |
1005 | dlopenok: |
1006 | dounlock(); |
1007 | return (void *)dls; |
1008 | dlopenerror: |
1009 | dounlock(); |
1010 | return NULL; |
1011 | } |
1012 | |
1013 | #if !FINK_BUILD |
1014 | static void *SDL_OSX_dlsym(void * dl_restrict handle, const char * dl_restrict symbol) |
1015 | { |
1016 | int sym_len = SDL_strlen(symbol); |
1017 | void *value = NULL; |
1018 | char *malloc_sym = NULL; |
1019 | dolock(); |
1020 | malloc_sym = SDL_malloc(sym_len + 2); |
1021 | if (malloc_sym) |
1022 | { |
1023 | SDL_snprintf(malloc_sym, sym_len+2, "_%s", symbol); |
1024 | value = dlsymIntern(handle, malloc_sym, 1); |
1025 | SDL_free(malloc_sym); |
1026 | } |
1027 | else |
1028 | { |
1029 | error("Unable to allocate memory"); |
1030 | goto dlsymerror; |
1031 | } |
1032 | dounlock(); |
1033 | return value; |
1034 | dlsymerror: |
1035 | dounlock(); |
1036 | return NULL; |
1037 | } |
1038 | #endif |
1039 | |
1040 | #if FINK_BUILD |
1041 | |
1042 | static void *dlsym_prepend_underscore(void *handle, const char *symbol) |
1043 | { |
1044 | void *answer; |
1045 | dolock(); |
1046 | answer = dlsym_prepend_underscore_intern(handle, symbol); |
1047 | dounlock(); |
1048 | return answer; |
1049 | } |
1050 | |
1051 | static void *dlsym_prepend_underscore_intern(void *handle, const char *symbol) |
1052 | { |
1053 | /* |
1054 | * A quick and easy way for porting packages which call dlsym(handle,"sym") |
1055 | * If the porter adds -Ddlsym=dlsym_prepend_underscore to the CFLAGS then |
1056 | * this function will be called, and will add the required underscore. |
1057 | * |
1058 | * Note that I haven't figured out yet which should be "standard", prepend |
1059 | * the underscore always, or not at all. These global functions need to go away |
1060 | * for opendarwin. |
1061 | */ |
1062 | int sym_len = SDL_strlen(symbol); |
1063 | void *value = NULL; |
1064 | char *malloc_sym = NULL; |
1065 | malloc_sym = SDL_malloc(sym_len + 2); |
1066 | if (malloc_sym) |
1067 | { |
1068 | SDL_snprintf(malloc_sym, sym_len+2, "_%s", symbol); |
1069 | value = dlsymIntern(handle, malloc_sym, 1); |
1070 | SDL_free(malloc_sym); |
1071 | } |
1072 | else |
1073 | { |
1074 | error("Unable to allocate memory"); |
1075 | } |
1076 | return value; |
1077 | } |
1078 | |
1079 | static void *dlsym_auto_underscore(void *handle, const char *symbol) |
1080 | { |
1081 | void *answer; |
1082 | dolock(); |
1083 | answer = dlsym_auto_underscore_intern(handle, symbol); |
1084 | dounlock(); |
1085 | return answer; |
1086 | |
1087 | } |
1088 | static void *dlsym_auto_underscore_intern(void *handle, const char *symbol) |
1089 | { |
1090 | struct dlstatus *dls = handle; |
1091 | void *addr = 0; |
1092 | addr = dlsymIntern(dls, symbol, 0); |
1093 | if (!addr) |
1094 | addr = dlsym_prepend_underscore_intern(handle, symbol); |
1095 | return addr; |
1096 | } |
1097 | |
1098 | |
1099 | static void *SDL_OSX_dlsym(void * dl_restrict handle, const char * dl_restrict symbol) |
1100 | { |
1101 | struct dlstatus *dls = handle; |
1102 | void *addr = 0; |
1103 | dolock(); |
1104 | addr = dlsymIntern(dls, symbol, 1); |
1105 | dounlock(); |
1106 | return addr; |
1107 | } |
1108 | #endif |
1109 | |
1110 | static int SDL_OSX_dlclose(void *handle) |
1111 | { |
1112 | struct dlstatus *dls = handle; |
1113 | dolock(); |
1114 | resetdlerror(); |
1115 | if (!isValidStatus(dls)) |
1116 | { |
1117 | goto dlcloseerror; |
1118 | } |
1119 | if (dls->module == MAGIC_DYLIB_MOD) |
1120 | { |
1121 | const char *name; |
1122 | if (!dls->lib) |
1123 | { |
1124 | name = "global context"; |
1125 | } |
1126 | else |
1127 | { |
1128 | name = get_lib_name(dls->lib); |
1129 | } |
1130 | warning("trying to close a .dylib!"); |
1131 | error("Not closing \"%s\" - dynamic libraries cannot be closed", name); |
1132 | goto dlcloseerror; |
1133 | } |
1134 | if (!dls->module) |
1135 | { |
1136 | error("module already closed"); |
1137 | goto dlcloseerror; |
1138 | } |
1139 | |
1140 | if (dls->refs == 1) |
1141 | { |
1142 | unsigned long options = 0; |
1143 | void (*fini) (void); |
1144 | if ((fini = dlsymIntern(dls, "__fini", 0))) |
1145 | { |
1146 | debug("calling _fini()"); |
1147 | fini(); |
1148 | } |
1149 | options |= NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES; |
1150 | #ifdef RTLD_NODELETE |
1151 | if (isFlagSet(dls->mode, RTLD_NODELETE)) |
1152 | options |= NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED; |
1153 | #endif |
1154 | if (!NSUnLinkModule(dls->module, options)) |
1155 | { |
1156 | error("unable to unlink module"); |
1157 | goto dlcloseerror; |
1158 | } |
1159 | dls->refs--; |
1160 | dls->module = 0; |
1161 | /* Note: the dlstatus struct dls is neither removed from the list |
1162 | * nor is the memory it occupies freed. This shouldn't pose a |
1163 | * problem in mostly all cases, though. |
1164 | */ |
1165 | } |
1166 | dounlock(); |
1167 | return 0; |
1168 | dlcloseerror: |
1169 | dounlock(); |
1170 | return 1; |
1171 | } |
1172 | |
1173 | static const char *SDL_OSX_dlerror(void) |
1174 | { |
1175 | struct dlthread *tss; |
1176 | const char * err_str = NULL; |
1177 | dlcompat_init_check(); |
1178 | tss = pthread_getspecific(dlerror_key); |
1179 | if (tss != NULL && tss->errset != 0) { |
1180 | tss->errset = 0; |
1181 | err_str = tss->errstr; |
1182 | } |
1183 | return (err_str); |
1184 | } |
1185 | |
1186 | /* Given an address, return the mach_header for the image containing it |
1187 | * or zero if the given address is not contained in any loaded images. |
1188 | */ |
1189 | static const struct mach_header *image_for_address(const void *address) |
1190 | { |
1191 | unsigned long i; |
1192 | unsigned long j; |
1193 | unsigned long count = _dyld_image_count(); |
1194 | const struct mach_header *mh = 0; |
1195 | struct load_command *lc = 0; |
1196 | unsigned long addr = 0; |
1197 | for (i = 0; i < count; i++) |
1198 | { |
1199 | addr = (unsigned long)address - _dyld_get_image_vmaddr_slide(i); |
1200 | mh = _dyld_get_image_header(i); |
1201 | if (mh) |
1202 | { |
1203 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
1204 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
1205 | { |
1206 | if (LC_SEGMENT == lc->cmd && |
1207 | addr >= ((struct segment_command *)lc)->vmaddr && |
1208 | addr < |
1209 | ((struct segment_command *)lc)->vmaddr + ((struct segment_command *)lc)->vmsize) |
1210 | { |
1211 | goto image_found; |
1212 | } |
1213 | } |
1214 | } |
1215 | mh = 0; |
1216 | } |
1217 | image_found: |
1218 | return mh; |
1219 | } |
1220 | |
1221 | #if 0 /* unused */ |
1222 | static int SDL_OSX_dladdr(const void * dl_restrict p, SDL_OSX_Dl_info * dl_restrict info) |
1223 | { |
1224 | /* |
1225 | FIXME: USe the routine image_for_address. |
1226 | */ |
1227 | unsigned long i; |
1228 | unsigned long j; |
1229 | unsigned long count = _dyld_image_count(); |
1230 | struct mach_header *mh = 0; |
1231 | struct load_command *lc = 0; |
1232 | unsigned long addr = NULL; |
1233 | unsigned long table_off = (unsigned long)0; |
1234 | int found = 0; |
1235 | if (!info) |
1236 | return 0; |
1237 | dolock(); |
1238 | resetdlerror(); |
1239 | info->dli_fname = 0; |
1240 | info->dli_fbase = 0; |
1241 | info->dli_sname = 0; |
1242 | info->dli_saddr = 0; |
1243 | /* Some of this was swiped from code posted by Douglas Davidson <ddavidso AT apple DOT com> |
1244 | * to darwin-development AT lists DOT apple DOT com and slightly modified |
1245 | */ |
1246 | for (i = 0; i < count; i++) |
1247 | { |
1248 | addr = (unsigned long)p - _dyld_get_image_vmaddr_slide(i); |
1249 | mh = _dyld_get_image_header(i); |
1250 | if (mh) |
1251 | { |
1252 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
1253 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
1254 | { |
1255 | if (LC_SEGMENT == lc->cmd && |
1256 | addr >= ((struct segment_command *)lc)->vmaddr && |
1257 | addr < |
1258 | ((struct segment_command *)lc)->vmaddr + ((struct segment_command *)lc)->vmsize) |
1259 | { |
1260 | info->dli_fname = _dyld_get_image_name(i); |
1261 | info->dli_fbase = (void *)mh; |
1262 | found = 1; |
1263 | break; |
1264 | } |
1265 | } |
1266 | if (found) |
1267 | break; |
1268 | } |
1269 | } |
1270 | if (!found) |
1271 | { |
1272 | dounlock(); |
1273 | return 0; |
1274 | } |
1275 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
1276 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
1277 | { |
1278 | if (LC_SEGMENT == lc->cmd) |
1279 | { |
1280 | if (!SDL_strcmp(((struct segment_command *)lc)->segname, "__LINKEDIT")) |
1281 | break; |
1282 | } |
1283 | } |
1284 | table_off = |
1285 | ((unsigned long)((struct segment_command *)lc)->vmaddr) - |
1286 | ((unsigned long)((struct segment_command *)lc)->fileoff) + _dyld_get_image_vmaddr_slide(i); |
1287 | debug("table off %x", table_off); |
1288 | |
1289 | lc = (struct load_command *)((char *)mh + sizeof(struct mach_header)); |
1290 | for (j = 0; j < mh->ncmds; j++, lc = (struct load_command *)((char *)lc + lc->cmdsize)) |
1291 | { |
1292 | if (LC_SYMTAB == lc->cmd) |
1293 | { |
1294 | |
1295 | struct nlist *symtable = (struct nlist *)(((struct symtab_command *)lc)->symoff + table_off); |
1296 | unsigned long numsyms = ((struct symtab_command *)lc)->nsyms; |
1297 | struct nlist *nearest = NULL; |
1298 | unsigned long diff = 0xffffffff; |
1299 | unsigned long strtable = (unsigned long)(((struct symtab_command *)lc)->stroff + table_off); |
1300 | debug("symtable %x", symtable); |
1301 | for (i = 0; i < numsyms; i++) |
1302 | { |
1303 | /* Ignore the following kinds of Symbols */ |
1304 | if ((!symtable->n_value) /* Undefined */ |
1305 | || (symtable->n_type >= N_PEXT) /* Debug symbol */ |
1306 | || (!(symtable->n_type & N_EXT)) /* Local Symbol */ |
1307 | ) |
1308 | { |
1309 | symtable++; |
1310 | continue; |
1311 | } |
1312 | if ((addr >= symtable->n_value) && (diff >= (symtable->n_value - addr))) |
1313 | { |
1314 | diff = (unsigned long)symtable->n_value - addr; |
1315 | nearest = symtable; |
1316 | } |
1317 | symtable++; |
1318 | } |
1319 | if (nearest) |
1320 | { |
1321 | info->dli_saddr = nearest->n_value + ((void *)p - addr); |
1322 | info->dli_sname = (char *)(strtable + nearest->n_un.n_strx); |
1323 | } |
1324 | } |
1325 | } |
1326 | dounlock(); |
1327 | return 1; |
1328 | } |
1329 | #endif |
1330 | |
1331 | /* |
1332 | * Implement the dlfunc() interface, which behaves exactly the same as |
1333 | * dlsym() except that it returns a function pointer instead of a data |
1334 | * pointer. This can be used by applications to avoid compiler warnings |
1335 | * about undefined behavior, and is intended as prior art for future |
1336 | * POSIX standardization. This function requires that all pointer types |
1337 | * have the same representation, which is true on all platforms FreeBSD |
1338 | * runs on, but is not guaranteed by the C standard. |
1339 | */ |
1340 | #if 0 |
1341 | static dlfunc_t SDL_OSX_dlfunc(void * dl_restrict handle, const char * dl_restrict symbol) |
1342 | { |
1343 | union |
1344 | { |
1345 | void *d; |
1346 | dlfunc_t f; |
1347 | } rv; |
1348 | int sym_len = SDL_strlen(symbol); |
1349 | char *malloc_sym = NULL; |
1350 | dolock(); |
1351 | malloc_sym = SDL_malloc(sym_len + 2); |
1352 | if (malloc_sym) |
1353 | { |
1354 | SDL_snprintf(malloc_sym, sym_len+2, "_%s", symbol); |
1355 | rv.d = dlsymIntern(handle, malloc_sym, 1); |
1356 | SDL_free(malloc_sym); |
1357 | } |
1358 | else |
1359 | { |
1360 | error("Unable to allocate memory"); |
1361 | goto dlfuncerror; |
1362 | } |
1363 | dounlock(); |
1364 | return rv.f; |
1365 | dlfuncerror: |
1366 | dounlock(); |
1367 | return NULL; |
1368 | } |
1369 | #endif |
1370 | |
1371 | |
1372 | |
1373 | /* dlcompat ends, here's the SDL interface... --ryan. */ |
1374 | |
1375 | |
1376 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
1377 | /* System dependent library loading routines */ |
1378 | |
1379 | #include "SDL_loadso.h" |
1380 | |
1381 | void *SDL_LoadObject(const char *sofile) |
1382 | { |
1383 | void *handle = SDL_OSX_dlopen(sofile, RTLD_NOW); |
1384 | const char *loaderror = SDL_OSX_dlerror(); |
1385 | if ( handle == NULL ) { |
1386 | SDL_SetError("Failed loading %s: %s", sofile, loaderror); |
1387 | } |
1388 | return(handle); |
1389 | } |
1390 | |
1391 | void *SDL_LoadFunction(void *handle, const char *name) |
1392 | { |
1393 | void *symbol = SDL_OSX_dlsym(handle, name); |
1394 | if ( symbol == NULL ) { |
1395 | SDL_SetError("Failed loading %s: %s", name, SDL_OSX_dlerror()); |
1396 | } |
1397 | return(symbol); |
1398 | } |
1399 | |
1400 | void SDL_UnloadObject(void *handle) |
1401 | { |
1402 | if ( handle != NULL ) { |
1403 | SDL_OSX_dlclose(handle); |
1404 | } |
1405 | } |
1406 | |
1407 | #endif /* SDL_LOADSO_DLCOMPAT */ |