Commit | Line | Data |
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0e5d83e3 JJ |
1 | /* Frame unwinder for frames using the libunwind library. |
2 | ||
6aba47ca | 3 | Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc. |
0e5d83e3 JJ |
4 | |
5 | Written by Jeff Johnston, contributed by Red Hat Inc. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
0e5d83e3 JJ |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0e5d83e3 JJ |
21 | |
22 | #include "defs.h" | |
23 | ||
24 | #include "inferior.h" | |
25 | #include "frame.h" | |
26 | #include "frame-base.h" | |
27 | #include "frame-unwind.h" | |
28 | #include "gdbcore.h" | |
29 | #include "gdbtypes.h" | |
30 | #include "symtab.h" | |
31 | #include "objfiles.h" | |
32 | #include "regcache.h" | |
33 | ||
34 | #include <dlfcn.h> | |
35 | ||
36 | #include "gdb_assert.h" | |
37 | #include "gdb_string.h" | |
38 | ||
39 | #include "libunwind-frame.h" | |
40 | ||
41 | #include "complaints.h" | |
42 | ||
43 | static int libunwind_initialized; | |
44 | static struct gdbarch_data *libunwind_descr_handle; | |
45 | ||
0e5d83e3 JJ |
46 | /* Required function pointers from libunwind. */ |
47 | static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *); | |
48 | static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *); | |
49 | static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t, unw_save_loc_t *); | |
c5a27d9c | 50 | static int (*unw_is_signal_frame_p) (unw_cursor_t *); |
0e5d83e3 JJ |
51 | static int (*unw_step_p) (unw_cursor_t *); |
52 | static int (*unw_init_remote_p) (unw_cursor_t *, unw_addr_space_t, void *); | |
53 | static unw_addr_space_t (*unw_create_addr_space_p) (unw_accessors_t *, int); | |
f43ae3f1 | 54 | static void (*unw_destroy_addr_space_p) (unw_addr_space_t); |
0e5d83e3 JJ |
55 | static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, unw_dyn_info_t *, |
56 | unw_proc_info_t *, int, void *); | |
503ff15d KB |
57 | static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *, |
58 | void *); | |
0e5d83e3 JJ |
59 | |
60 | ||
61 | struct libunwind_frame_cache | |
62 | { | |
63 | CORE_ADDR base; | |
64 | CORE_ADDR func_addr; | |
65 | unw_cursor_t cursor; | |
272dfcfd | 66 | unw_addr_space_t as; |
0e5d83e3 JJ |
67 | }; |
68 | ||
69 | /* We need to qualify the function names with a platform-specific prefix to match | |
70 | the names used by the libunwind library. The UNW_OBJ macro is provided by the | |
71 | libunwind.h header file. */ | |
72 | #define STRINGIFY2(name) #name | |
73 | #define STRINGIFY(name) STRINGIFY2(name) | |
74 | ||
38e400fa | 75 | #ifndef LIBUNWIND_SO |
70f575cc JK |
76 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
77 | only library, not a runtime one. */ | |
78 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
79 | #endif |
80 | ||
0e5d83e3 JJ |
81 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
82 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
83 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
c5a27d9c | 84 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
0e5d83e3 JJ |
85 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
86 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
87 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); | |
f43ae3f1 | 88 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
0e5d83e3 JJ |
89 | static char *search_unwind_table_name = STRINGIFY(UNW_OBJ(search_unwind_table)); |
90 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); | |
91 | ||
92 | static struct libunwind_descr * | |
93 | libunwind_descr (struct gdbarch *gdbarch) | |
94 | { | |
95 | return gdbarch_data (gdbarch, libunwind_descr_handle); | |
96 | } | |
97 | ||
98 | static void * | |
99 | libunwind_descr_init (struct gdbarch *gdbarch) | |
100 | { | |
101 | struct libunwind_descr *descr = GDBARCH_OBSTACK_ZALLOC (gdbarch, | |
102 | struct libunwind_descr); | |
103 | return descr; | |
104 | } | |
105 | ||
106 | void | |
107 | libunwind_frame_set_descr (struct gdbarch *gdbarch, struct libunwind_descr *descr) | |
108 | { | |
109 | struct libunwind_descr *arch_descr; | |
110 | ||
111 | gdb_assert (gdbarch != NULL); | |
112 | ||
113 | arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle); | |
114 | ||
115 | if (arch_descr == NULL) | |
116 | { | |
117 | /* First time here. Must initialize data area. */ | |
118 | arch_descr = libunwind_descr_init (gdbarch); | |
030f20e1 | 119 | deprecated_set_gdbarch_data (gdbarch, libunwind_descr_handle, arch_descr); |
0e5d83e3 JJ |
120 | } |
121 | ||
122 | /* Copy new descriptor info into arch descriptor. */ | |
123 | arch_descr->gdb2uw = descr->gdb2uw; | |
124 | arch_descr->uw2gdb = descr->uw2gdb; | |
125 | arch_descr->is_fpreg = descr->is_fpreg; | |
126 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 127 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
128 | } |
129 | ||
130 | static struct libunwind_frame_cache * | |
131 | libunwind_frame_cache (struct frame_info *next_frame, void **this_cache) | |
132 | { | |
133 | unw_accessors_t *acc; | |
134 | unw_addr_space_t as; | |
135 | unw_word_t fp; | |
136 | unw_regnum_t uw_sp_regnum; | |
137 | struct libunwind_frame_cache *cache; | |
138 | struct libunwind_descr *descr; | |
139 | int i, ret; | |
140 | ||
141 | if (*this_cache) | |
142 | return *this_cache; | |
143 | ||
144 | /* Allocate a new cache. */ | |
145 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
146 | ||
93d42b30 DJ |
147 | /* We can assume we are unwinding a normal frame. Even if this is |
148 | for a signal trampoline, ia64 signal "trampolines" use a normal | |
149 | subroutine call to start the signal handler. */ | |
150 | cache->func_addr = frame_func_unwind (next_frame, NORMAL_FRAME); | |
c5a27d9c JJ |
151 | if (cache->func_addr == 0 |
152 | && frame_relative_level (next_frame) > 0 | |
153 | && get_frame_type (next_frame) != SIGTRAMP_FRAME) | |
154 | return NULL; | |
0e5d83e3 JJ |
155 | |
156 | /* Get a libunwind cursor to the previous frame. We do this by initializing | |
157 | a cursor. Libunwind treats a new cursor as the top of stack and will get | |
158 | the current register set via the libunwind register accessor. Now, we | |
159 | provide the platform-specific accessors and we set up the register accessor to use | |
160 | the frame register unwinding interfaces so that we properly get the registers for | |
161 | the current frame rather than the top. We then use the unw_step function to | |
162 | move the libunwind cursor back one frame. We can later use this cursor to find previous | |
163 | registers via the unw_get_reg interface which will invoke libunwind's special logic. */ | |
164 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
165 | acc = descr->accessors; | |
166 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
167 | gdbarch_byte_order (current_gdbarch) |
168 | == BFD_ENDIAN_BIG | |
0e5d83e3 JJ |
169 | ? __BIG_ENDIAN |
170 | : __LITTLE_ENDIAN); | |
171 | ||
172 | unw_init_remote_p (&cache->cursor, as, next_frame); | |
c5a27d9c | 173 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
174 | { |
175 | unw_destroy_addr_space_p (as); | |
176 | return NULL; | |
177 | } | |
0e5d83e3 JJ |
178 | |
179 | /* To get base address, get sp from previous frame. */ | |
3e8c568d | 180 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (current_gdbarch)); |
0e5d83e3 JJ |
181 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
182 | if (ret < 0) | |
f43ae3f1 AS |
183 | { |
184 | unw_destroy_addr_space_p (as); | |
185 | error (_("Can't get libunwind sp register.")); | |
186 | } | |
0e5d83e3 JJ |
187 | |
188 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 189 | cache->as = as; |
0e5d83e3 JJ |
190 | |
191 | *this_cache = cache; | |
192 | return cache; | |
193 | } | |
194 | ||
272dfcfd AS |
195 | void |
196 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
197 | { | |
198 | struct libunwind_frame_cache *cache = this_cache; | |
199 | if (cache->as) | |
200 | unw_destroy_addr_space_p (cache->as); | |
201 | } | |
202 | ||
503ff15d KB |
203 | unw_word_t |
204 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 205 | { |
503ff15d | 206 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
207 | } |
208 | ||
209 | static const struct frame_unwind libunwind_frame_unwind = | |
210 | { | |
211 | NORMAL_FRAME, | |
212 | libunwind_frame_this_id, | |
272dfcfd AS |
213 | libunwind_frame_prev_register, |
214 | NULL, | |
215 | NULL, | |
216 | NULL, | |
217 | libunwind_frame_dealloc_cache | |
0e5d83e3 JJ |
218 | }; |
219 | ||
220 | /* Verify if there is sufficient libunwind information for the frame to use | |
221 | libunwind frame unwinding. */ | |
222 | const struct frame_unwind * | |
223 | libunwind_frame_sniffer (struct frame_info *next_frame) | |
224 | { | |
225 | unw_cursor_t cursor; | |
226 | unw_accessors_t *acc; | |
227 | unw_addr_space_t as; | |
228 | struct libunwind_descr *descr; | |
229 | int i, ret; | |
230 | ||
231 | /* To test for libunwind unwind support, initialize a cursor to the current frame and try to back | |
232 | up. We use this same method when setting up the frame cache (see libunwind_frame_cache()). | |
233 | If libunwind returns success for this operation, it means that it has found sufficient | |
234 | libunwind unwinding information to do so. */ | |
235 | ||
236 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
237 | acc = descr->accessors; | |
238 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
239 | gdbarch_byte_order (current_gdbarch) |
240 | == BFD_ENDIAN_BIG | |
0e5d83e3 JJ |
241 | ? __BIG_ENDIAN |
242 | : __LITTLE_ENDIAN); | |
243 | ||
244 | ret = unw_init_remote_p (&cursor, as, next_frame); | |
245 | ||
c5a27d9c | 246 | if (ret < 0) |
f43ae3f1 AS |
247 | { |
248 | unw_destroy_addr_space_p (as); | |
249 | return NULL; | |
250 | } | |
c5a27d9c JJ |
251 | |
252 | ||
253 | /* Check to see if we have libunwind info by checking if we are in a | |
254 | signal frame. If it doesn't return an error, we have libunwind info | |
255 | and can use libunwind. */ | |
256 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 257 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
258 | |
259 | if (ret < 0) | |
260 | return NULL; | |
261 | ||
262 | return &libunwind_frame_unwind; | |
263 | } | |
264 | ||
265 | void | |
266 | libunwind_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
267 | struct frame_id *this_id) | |
268 | { | |
269 | struct libunwind_frame_cache *cache = | |
270 | libunwind_frame_cache (next_frame, this_cache); | |
271 | ||
c5a27d9c JJ |
272 | if (cache != NULL) |
273 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
274 | else | |
275 | (*this_id) = null_frame_id; | |
0e5d83e3 JJ |
276 | } |
277 | ||
278 | void | |
279 | libunwind_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
280 | int regnum, int *optimizedp, | |
281 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
f1b4b38e | 282 | int *realnump, gdb_byte *valuep) |
0e5d83e3 JJ |
283 | { |
284 | struct libunwind_frame_cache *cache = | |
285 | libunwind_frame_cache (next_frame, this_cache); | |
286 | ||
287 | void *ptr; | |
288 | unw_cursor_t *c; | |
289 | unw_save_loc_t sl; | |
290 | int i, ret; | |
291 | unw_word_t intval; | |
292 | unw_fpreg_t fpval; | |
293 | unw_regnum_t uw_regnum; | |
294 | struct libunwind_descr *descr; | |
295 | ||
c5a27d9c JJ |
296 | if (cache == NULL) |
297 | return; | |
298 | ||
0e5d83e3 JJ |
299 | /* Convert from gdb register number to libunwind register number. */ |
300 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
301 | uw_regnum = descr->gdb2uw (regnum); | |
302 | ||
303 | gdb_assert (regnum >= 0); | |
304 | ||
305 | if (!target_has_registers) | |
8a3fe4f8 | 306 | error (_("No registers.")); |
0e5d83e3 JJ |
307 | |
308 | *optimizedp = 0; | |
309 | *addrp = 0; | |
310 | *lvalp = not_lval; | |
311 | *realnump = -1; | |
312 | ||
6672f2ae AS |
313 | if (valuep) |
314 | memset (valuep, 0, register_size (current_gdbarch, regnum)); | |
0e5d83e3 JJ |
315 | |
316 | if (uw_regnum < 0) | |
317 | return; | |
318 | ||
319 | /* To get the previous register, we use the libunwind register APIs with | |
320 | the cursor we have already pushed back to the previous frame. */ | |
321 | ||
322 | if (descr->is_fpreg (uw_regnum)) | |
323 | { | |
324 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
325 | ptr = &fpval; | |
326 | } | |
327 | else | |
328 | { | |
329 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
330 | ptr = &intval; | |
331 | } | |
332 | ||
333 | if (ret < 0) | |
334 | return; | |
335 | ||
6672f2ae AS |
336 | if (valuep) |
337 | memcpy (valuep, ptr, register_size (current_gdbarch, regnum)); | |
0e5d83e3 JJ |
338 | |
339 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
340 | return; | |
341 | ||
342 | switch (sl.type) | |
343 | { | |
344 | case UNW_SLT_NONE: | |
345 | *optimizedp = 1; | |
346 | break; | |
347 | ||
348 | case UNW_SLT_MEMORY: | |
349 | *lvalp = lval_memory; | |
350 | *addrp = sl.u.addr; | |
351 | break; | |
352 | ||
353 | case UNW_SLT_REG: | |
354 | *lvalp = lval_register; | |
355 | *realnump = regnum; | |
356 | break; | |
357 | } | |
358 | } | |
359 | ||
360 | CORE_ADDR | |
361 | libunwind_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
362 | { | |
363 | struct libunwind_frame_cache *cache = | |
364 | libunwind_frame_cache (next_frame, this_cache); | |
365 | ||
c5a27d9c JJ |
366 | if (cache == NULL) |
367 | return (CORE_ADDR)NULL; | |
0e5d83e3 JJ |
368 | return cache->base; |
369 | } | |
370 | ||
371 | /* The following is a glue routine to call the libunwind unwind table | |
372 | search function to get unwind information for a specified ip address. */ | |
373 | int | |
374 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
375 | void *pi, int need_unwind_info, void *args) | |
376 | { | |
377 | return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip, | |
378 | di, pi, need_unwind_info, args); | |
379 | } | |
380 | ||
c5a27d9c JJ |
381 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
382 | const struct frame_unwind * | |
383 | libunwind_sigtramp_frame_sniffer (struct frame_info *next_frame) | |
384 | { | |
385 | unw_cursor_t cursor; | |
386 | unw_accessors_t *acc; | |
387 | unw_addr_space_t as; | |
388 | struct libunwind_descr *descr; | |
389 | int i, ret; | |
390 | ||
391 | /* To test for libunwind unwind support, initialize a cursor to the | |
392 | current frame and try to back up. We use this same method when | |
393 | setting up the frame cache (see libunwind_frame_cache()). If | |
394 | libunwind returns success for this operation, it means that it | |
395 | has found sufficient libunwind unwinding information to do | |
396 | so. */ | |
397 | ||
398 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
399 | acc = descr->accessors; | |
400 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
401 | gdbarch_byte_order (current_gdbarch) |
402 | == BFD_ENDIAN_BIG | |
c5a27d9c JJ |
403 | ? __BIG_ENDIAN |
404 | : __LITTLE_ENDIAN); | |
405 | ||
406 | ret = unw_init_remote_p (&cursor, as, next_frame); | |
407 | ||
408 | if (ret < 0) | |
f43ae3f1 AS |
409 | { |
410 | unw_destroy_addr_space_p (as); | |
411 | return NULL; | |
412 | } | |
c5a27d9c JJ |
413 | |
414 | /* Check to see if we are in a signal frame. */ | |
415 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 416 | unw_destroy_addr_space_p (as); |
c5a27d9c JJ |
417 | if (ret > 0) |
418 | return &libunwind_frame_unwind; | |
419 | ||
420 | return NULL; | |
421 | } | |
422 | ||
423 | /* The following routine is for accessing special registers of the top frame. | |
424 | A special set of accessors must be given that work without frame info. | |
425 | This is used by ia64 to access the rse registers r32-r127. While they | |
426 | are usually located at BOF, this is not always true and only the libunwind | |
427 | info can decipher where they actually are. */ | |
428 | int | |
45ecac4b UW |
429 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
430 | int regnum, void *buf) | |
c5a27d9c JJ |
431 | { |
432 | unw_cursor_t cursor; | |
433 | unw_accessors_t *acc; | |
434 | unw_addr_space_t as; | |
435 | struct libunwind_descr *descr; | |
436 | int ret; | |
437 | unw_regnum_t uw_regnum; | |
438 | unw_word_t intval; | |
439 | unw_fpreg_t fpval; | |
440 | void *ptr; | |
441 | ||
442 | ||
443 | descr = libunwind_descr (gdbarch); | |
444 | acc = descr->special_accessors; | |
445 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
446 | gdbarch_byte_order (current_gdbarch) |
447 | == BFD_ENDIAN_BIG | |
c5a27d9c JJ |
448 | ? __BIG_ENDIAN |
449 | : __LITTLE_ENDIAN); | |
450 | ||
45ecac4b | 451 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 452 | if (ret < 0) |
f43ae3f1 AS |
453 | { |
454 | unw_destroy_addr_space_p (as); | |
455 | return -1; | |
456 | } | |
c5a27d9c JJ |
457 | |
458 | uw_regnum = descr->gdb2uw (regnum); | |
459 | ||
460 | if (descr->is_fpreg (uw_regnum)) | |
461 | { | |
462 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
463 | ptr = &fpval; | |
464 | } | |
465 | else | |
466 | { | |
467 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
468 | ptr = &intval; | |
469 | } | |
470 | ||
f43ae3f1 AS |
471 | unw_destroy_addr_space_p (as); |
472 | ||
c5a27d9c JJ |
473 | if (ret < 0) |
474 | return -1; | |
475 | ||
476 | if (buf) | |
477 | memcpy (buf, ptr, register_size (current_gdbarch, regnum)); | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
0e5d83e3 JJ |
482 | static int |
483 | libunwind_load (void) | |
484 | { | |
485 | void *handle; | |
486 | ||
487 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
488 | if (handle == NULL) | |
489 | return 0; | |
490 | ||
491 | /* Initialize pointers to the dynamic library functions we will use. */ | |
492 | ||
493 | unw_get_reg_p = dlsym (handle, get_reg_name); | |
494 | if (unw_get_reg_p == NULL) | |
495 | return 0; | |
496 | ||
497 | unw_get_fpreg_p = dlsym (handle, get_fpreg_name); | |
498 | if (unw_get_fpreg_p == NULL) | |
499 | return 0; | |
500 | ||
501 | unw_get_saveloc_p = dlsym (handle, get_saveloc_name); | |
502 | if (unw_get_saveloc_p == NULL) | |
503 | return 0; | |
504 | ||
c5a27d9c JJ |
505 | unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name); |
506 | if (unw_is_signal_frame_p == NULL) | |
507 | return 0; | |
508 | ||
0e5d83e3 JJ |
509 | unw_step_p = dlsym (handle, step_name); |
510 | if (unw_step_p == NULL) | |
511 | return 0; | |
512 | ||
513 | unw_init_remote_p = dlsym (handle, init_remote_name); | |
514 | if (unw_init_remote_p == NULL) | |
515 | return 0; | |
516 | ||
517 | unw_create_addr_space_p = dlsym (handle, create_addr_space_name); | |
518 | if (unw_create_addr_space_p == NULL) | |
519 | return 0; | |
520 | ||
f43ae3f1 AS |
521 | unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name); |
522 | if (unw_destroy_addr_space_p == NULL) | |
523 | return 0; | |
524 | ||
0e5d83e3 JJ |
525 | unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name); |
526 | if (unw_search_unwind_table_p == NULL) | |
527 | return 0; | |
528 | ||
529 | unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name); | |
530 | if (unw_find_dyn_list_p == NULL) | |
531 | return 0; | |
532 | ||
533 | return 1; | |
534 | } | |
535 | ||
536 | int | |
537 | libunwind_is_initialized (void) | |
538 | { | |
539 | return libunwind_initialized; | |
540 | } | |
541 | ||
542 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
543 | void _initialize_libunwind_frame (void); | |
544 | ||
545 | void | |
546 | _initialize_libunwind_frame (void) | |
547 | { | |
030f20e1 | 548 | libunwind_descr_handle = gdbarch_data_register_post_init (libunwind_descr_init); |
0e5d83e3 JJ |
549 | |
550 | libunwind_initialized = libunwind_load (); | |
551 | } |