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 | |
11 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
20 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
22 | Boston, MA 02110-1301, USA. */ | |
0e5d83e3 JJ |
23 | |
24 | #include "defs.h" | |
25 | ||
26 | #include "inferior.h" | |
27 | #include "frame.h" | |
28 | #include "frame-base.h" | |
29 | #include "frame-unwind.h" | |
30 | #include "gdbcore.h" | |
31 | #include "gdbtypes.h" | |
32 | #include "symtab.h" | |
33 | #include "objfiles.h" | |
34 | #include "regcache.h" | |
35 | ||
36 | #include <dlfcn.h> | |
37 | ||
38 | #include "gdb_assert.h" | |
39 | #include "gdb_string.h" | |
40 | ||
41 | #include "libunwind-frame.h" | |
42 | ||
43 | #include "complaints.h" | |
44 | ||
45 | static int libunwind_initialized; | |
46 | static struct gdbarch_data *libunwind_descr_handle; | |
47 | ||
0e5d83e3 JJ |
48 | /* Required function pointers from libunwind. */ |
49 | static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *); | |
50 | static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *); | |
51 | static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t, unw_save_loc_t *); | |
c5a27d9c | 52 | static int (*unw_is_signal_frame_p) (unw_cursor_t *); |
0e5d83e3 JJ |
53 | static int (*unw_step_p) (unw_cursor_t *); |
54 | static int (*unw_init_remote_p) (unw_cursor_t *, unw_addr_space_t, void *); | |
55 | static unw_addr_space_t (*unw_create_addr_space_p) (unw_accessors_t *, int); | |
f43ae3f1 | 56 | static void (*unw_destroy_addr_space_p) (unw_addr_space_t); |
0e5d83e3 JJ |
57 | static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, unw_dyn_info_t *, |
58 | unw_proc_info_t *, int, void *); | |
503ff15d KB |
59 | static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *, |
60 | void *); | |
0e5d83e3 JJ |
61 | |
62 | ||
63 | struct libunwind_frame_cache | |
64 | { | |
65 | CORE_ADDR base; | |
66 | CORE_ADDR func_addr; | |
67 | unw_cursor_t cursor; | |
272dfcfd | 68 | unw_addr_space_t as; |
0e5d83e3 JJ |
69 | }; |
70 | ||
71 | /* We need to qualify the function names with a platform-specific prefix to match | |
72 | the names used by the libunwind library. The UNW_OBJ macro is provided by the | |
73 | libunwind.h header file. */ | |
74 | #define STRINGIFY2(name) #name | |
75 | #define STRINGIFY(name) STRINGIFY2(name) | |
76 | ||
38e400fa | 77 | #ifndef LIBUNWIND_SO |
70f575cc JK |
78 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
79 | only library, not a runtime one. */ | |
80 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
81 | #endif |
82 | ||
0e5d83e3 JJ |
83 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
84 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
85 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
c5a27d9c | 86 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
0e5d83e3 JJ |
87 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
88 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
89 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); | |
f43ae3f1 | 90 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
0e5d83e3 JJ |
91 | static char *search_unwind_table_name = STRINGIFY(UNW_OBJ(search_unwind_table)); |
92 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); | |
93 | ||
94 | static struct libunwind_descr * | |
95 | libunwind_descr (struct gdbarch *gdbarch) | |
96 | { | |
97 | return gdbarch_data (gdbarch, libunwind_descr_handle); | |
98 | } | |
99 | ||
100 | static void * | |
101 | libunwind_descr_init (struct gdbarch *gdbarch) | |
102 | { | |
103 | struct libunwind_descr *descr = GDBARCH_OBSTACK_ZALLOC (gdbarch, | |
104 | struct libunwind_descr); | |
105 | return descr; | |
106 | } | |
107 | ||
108 | void | |
109 | libunwind_frame_set_descr (struct gdbarch *gdbarch, struct libunwind_descr *descr) | |
110 | { | |
111 | struct libunwind_descr *arch_descr; | |
112 | ||
113 | gdb_assert (gdbarch != NULL); | |
114 | ||
115 | arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle); | |
116 | ||
117 | if (arch_descr == NULL) | |
118 | { | |
119 | /* First time here. Must initialize data area. */ | |
120 | arch_descr = libunwind_descr_init (gdbarch); | |
030f20e1 | 121 | deprecated_set_gdbarch_data (gdbarch, libunwind_descr_handle, arch_descr); |
0e5d83e3 JJ |
122 | } |
123 | ||
124 | /* Copy new descriptor info into arch descriptor. */ | |
125 | arch_descr->gdb2uw = descr->gdb2uw; | |
126 | arch_descr->uw2gdb = descr->uw2gdb; | |
127 | arch_descr->is_fpreg = descr->is_fpreg; | |
128 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 129 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
130 | } |
131 | ||
132 | static struct libunwind_frame_cache * | |
133 | libunwind_frame_cache (struct frame_info *next_frame, void **this_cache) | |
134 | { | |
135 | unw_accessors_t *acc; | |
136 | unw_addr_space_t as; | |
137 | unw_word_t fp; | |
138 | unw_regnum_t uw_sp_regnum; | |
139 | struct libunwind_frame_cache *cache; | |
140 | struct libunwind_descr *descr; | |
141 | int i, ret; | |
142 | ||
143 | if (*this_cache) | |
144 | return *this_cache; | |
145 | ||
146 | /* Allocate a new cache. */ | |
147 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
148 | ||
93d42b30 DJ |
149 | /* We can assume we are unwinding a normal frame. Even if this is |
150 | for a signal trampoline, ia64 signal "trampolines" use a normal | |
151 | subroutine call to start the signal handler. */ | |
152 | cache->func_addr = frame_func_unwind (next_frame, NORMAL_FRAME); | |
c5a27d9c JJ |
153 | if (cache->func_addr == 0 |
154 | && frame_relative_level (next_frame) > 0 | |
155 | && get_frame_type (next_frame) != SIGTRAMP_FRAME) | |
156 | return NULL; | |
0e5d83e3 JJ |
157 | |
158 | /* Get a libunwind cursor to the previous frame. We do this by initializing | |
159 | a cursor. Libunwind treats a new cursor as the top of stack and will get | |
160 | the current register set via the libunwind register accessor. Now, we | |
161 | provide the platform-specific accessors and we set up the register accessor to use | |
162 | the frame register unwinding interfaces so that we properly get the registers for | |
163 | the current frame rather than the top. We then use the unw_step function to | |
164 | move the libunwind cursor back one frame. We can later use this cursor to find previous | |
165 | registers via the unw_get_reg interface which will invoke libunwind's special logic. */ | |
166 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
167 | acc = descr->accessors; | |
168 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
169 | gdbarch_byte_order (current_gdbarch) |
170 | == BFD_ENDIAN_BIG | |
0e5d83e3 JJ |
171 | ? __BIG_ENDIAN |
172 | : __LITTLE_ENDIAN); | |
173 | ||
174 | unw_init_remote_p (&cache->cursor, as, next_frame); | |
c5a27d9c | 175 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
176 | { |
177 | unw_destroy_addr_space_p (as); | |
178 | return NULL; | |
179 | } | |
0e5d83e3 JJ |
180 | |
181 | /* To get base address, get sp from previous frame. */ | |
182 | uw_sp_regnum = descr->gdb2uw (SP_REGNUM); | |
183 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); | |
184 | if (ret < 0) | |
f43ae3f1 AS |
185 | { |
186 | unw_destroy_addr_space_p (as); | |
187 | error (_("Can't get libunwind sp register.")); | |
188 | } | |
0e5d83e3 JJ |
189 | |
190 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 191 | cache->as = as; |
0e5d83e3 JJ |
192 | |
193 | *this_cache = cache; | |
194 | return cache; | |
195 | } | |
196 | ||
272dfcfd AS |
197 | void |
198 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
199 | { | |
200 | struct libunwind_frame_cache *cache = this_cache; | |
201 | if (cache->as) | |
202 | unw_destroy_addr_space_p (cache->as); | |
203 | } | |
204 | ||
503ff15d KB |
205 | unw_word_t |
206 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 207 | { |
503ff15d | 208 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
209 | } |
210 | ||
211 | static const struct frame_unwind libunwind_frame_unwind = | |
212 | { | |
213 | NORMAL_FRAME, | |
214 | libunwind_frame_this_id, | |
272dfcfd AS |
215 | libunwind_frame_prev_register, |
216 | NULL, | |
217 | NULL, | |
218 | NULL, | |
219 | libunwind_frame_dealloc_cache | |
0e5d83e3 JJ |
220 | }; |
221 | ||
222 | /* Verify if there is sufficient libunwind information for the frame to use | |
223 | libunwind frame unwinding. */ | |
224 | const struct frame_unwind * | |
225 | libunwind_frame_sniffer (struct frame_info *next_frame) | |
226 | { | |
227 | unw_cursor_t cursor; | |
228 | unw_accessors_t *acc; | |
229 | unw_addr_space_t as; | |
230 | struct libunwind_descr *descr; | |
231 | int i, ret; | |
232 | ||
233 | /* To test for libunwind unwind support, initialize a cursor to the current frame and try to back | |
234 | up. We use this same method when setting up the frame cache (see libunwind_frame_cache()). | |
235 | If libunwind returns success for this operation, it means that it has found sufficient | |
236 | libunwind unwinding information to do so. */ | |
237 | ||
238 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
239 | acc = descr->accessors; | |
240 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
241 | gdbarch_byte_order (current_gdbarch) |
242 | == BFD_ENDIAN_BIG | |
0e5d83e3 JJ |
243 | ? __BIG_ENDIAN |
244 | : __LITTLE_ENDIAN); | |
245 | ||
246 | ret = unw_init_remote_p (&cursor, as, next_frame); | |
247 | ||
c5a27d9c | 248 | if (ret < 0) |
f43ae3f1 AS |
249 | { |
250 | unw_destroy_addr_space_p (as); | |
251 | return NULL; | |
252 | } | |
c5a27d9c JJ |
253 | |
254 | ||
255 | /* Check to see if we have libunwind info by checking if we are in a | |
256 | signal frame. If it doesn't return an error, we have libunwind info | |
257 | and can use libunwind. */ | |
258 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 259 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
260 | |
261 | if (ret < 0) | |
262 | return NULL; | |
263 | ||
264 | return &libunwind_frame_unwind; | |
265 | } | |
266 | ||
267 | void | |
268 | libunwind_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
269 | struct frame_id *this_id) | |
270 | { | |
271 | struct libunwind_frame_cache *cache = | |
272 | libunwind_frame_cache (next_frame, this_cache); | |
273 | ||
c5a27d9c JJ |
274 | if (cache != NULL) |
275 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
276 | else | |
277 | (*this_id) = null_frame_id; | |
0e5d83e3 JJ |
278 | } |
279 | ||
280 | void | |
281 | libunwind_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
282 | int regnum, int *optimizedp, | |
283 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
f1b4b38e | 284 | int *realnump, gdb_byte *valuep) |
0e5d83e3 JJ |
285 | { |
286 | struct libunwind_frame_cache *cache = | |
287 | libunwind_frame_cache (next_frame, this_cache); | |
288 | ||
289 | void *ptr; | |
290 | unw_cursor_t *c; | |
291 | unw_save_loc_t sl; | |
292 | int i, ret; | |
293 | unw_word_t intval; | |
294 | unw_fpreg_t fpval; | |
295 | unw_regnum_t uw_regnum; | |
296 | struct libunwind_descr *descr; | |
297 | ||
c5a27d9c JJ |
298 | if (cache == NULL) |
299 | return; | |
300 | ||
0e5d83e3 JJ |
301 | /* Convert from gdb register number to libunwind register number. */ |
302 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
303 | uw_regnum = descr->gdb2uw (regnum); | |
304 | ||
305 | gdb_assert (regnum >= 0); | |
306 | ||
307 | if (!target_has_registers) | |
8a3fe4f8 | 308 | error (_("No registers.")); |
0e5d83e3 JJ |
309 | |
310 | *optimizedp = 0; | |
311 | *addrp = 0; | |
312 | *lvalp = not_lval; | |
313 | *realnump = -1; | |
314 | ||
6672f2ae AS |
315 | if (valuep) |
316 | memset (valuep, 0, register_size (current_gdbarch, regnum)); | |
0e5d83e3 JJ |
317 | |
318 | if (uw_regnum < 0) | |
319 | return; | |
320 | ||
321 | /* To get the previous register, we use the libunwind register APIs with | |
322 | the cursor we have already pushed back to the previous frame. */ | |
323 | ||
324 | if (descr->is_fpreg (uw_regnum)) | |
325 | { | |
326 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
327 | ptr = &fpval; | |
328 | } | |
329 | else | |
330 | { | |
331 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
332 | ptr = &intval; | |
333 | } | |
334 | ||
335 | if (ret < 0) | |
336 | return; | |
337 | ||
6672f2ae AS |
338 | if (valuep) |
339 | memcpy (valuep, ptr, register_size (current_gdbarch, regnum)); | |
0e5d83e3 JJ |
340 | |
341 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
342 | return; | |
343 | ||
344 | switch (sl.type) | |
345 | { | |
346 | case UNW_SLT_NONE: | |
347 | *optimizedp = 1; | |
348 | break; | |
349 | ||
350 | case UNW_SLT_MEMORY: | |
351 | *lvalp = lval_memory; | |
352 | *addrp = sl.u.addr; | |
353 | break; | |
354 | ||
355 | case UNW_SLT_REG: | |
356 | *lvalp = lval_register; | |
357 | *realnump = regnum; | |
358 | break; | |
359 | } | |
360 | } | |
361 | ||
362 | CORE_ADDR | |
363 | libunwind_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
364 | { | |
365 | struct libunwind_frame_cache *cache = | |
366 | libunwind_frame_cache (next_frame, this_cache); | |
367 | ||
c5a27d9c JJ |
368 | if (cache == NULL) |
369 | return (CORE_ADDR)NULL; | |
0e5d83e3 JJ |
370 | return cache->base; |
371 | } | |
372 | ||
373 | /* The following is a glue routine to call the libunwind unwind table | |
374 | search function to get unwind information for a specified ip address. */ | |
375 | int | |
376 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
377 | void *pi, int need_unwind_info, void *args) | |
378 | { | |
379 | return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip, | |
380 | di, pi, need_unwind_info, args); | |
381 | } | |
382 | ||
c5a27d9c JJ |
383 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
384 | const struct frame_unwind * | |
385 | libunwind_sigtramp_frame_sniffer (struct frame_info *next_frame) | |
386 | { | |
387 | unw_cursor_t cursor; | |
388 | unw_accessors_t *acc; | |
389 | unw_addr_space_t as; | |
390 | struct libunwind_descr *descr; | |
391 | int i, ret; | |
392 | ||
393 | /* To test for libunwind unwind support, initialize a cursor to the | |
394 | current frame and try to back up. We use this same method when | |
395 | setting up the frame cache (see libunwind_frame_cache()). If | |
396 | libunwind returns success for this operation, it means that it | |
397 | has found sufficient libunwind unwinding information to do | |
398 | so. */ | |
399 | ||
400 | descr = libunwind_descr (get_frame_arch (next_frame)); | |
401 | acc = descr->accessors; | |
402 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
403 | gdbarch_byte_order (current_gdbarch) |
404 | == BFD_ENDIAN_BIG | |
c5a27d9c JJ |
405 | ? __BIG_ENDIAN |
406 | : __LITTLE_ENDIAN); | |
407 | ||
408 | ret = unw_init_remote_p (&cursor, as, next_frame); | |
409 | ||
410 | if (ret < 0) | |
f43ae3f1 AS |
411 | { |
412 | unw_destroy_addr_space_p (as); | |
413 | return NULL; | |
414 | } | |
c5a27d9c JJ |
415 | |
416 | /* Check to see if we are in a signal frame. */ | |
417 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 418 | unw_destroy_addr_space_p (as); |
c5a27d9c JJ |
419 | if (ret > 0) |
420 | return &libunwind_frame_unwind; | |
421 | ||
422 | return NULL; | |
423 | } | |
424 | ||
425 | /* The following routine is for accessing special registers of the top frame. | |
426 | A special set of accessors must be given that work without frame info. | |
427 | This is used by ia64 to access the rse registers r32-r127. While they | |
428 | are usually located at BOF, this is not always true and only the libunwind | |
429 | info can decipher where they actually are. */ | |
430 | int | |
45ecac4b UW |
431 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
432 | int regnum, void *buf) | |
c5a27d9c JJ |
433 | { |
434 | unw_cursor_t cursor; | |
435 | unw_accessors_t *acc; | |
436 | unw_addr_space_t as; | |
437 | struct libunwind_descr *descr; | |
438 | int ret; | |
439 | unw_regnum_t uw_regnum; | |
440 | unw_word_t intval; | |
441 | unw_fpreg_t fpval; | |
442 | void *ptr; | |
443 | ||
444 | ||
445 | descr = libunwind_descr (gdbarch); | |
446 | acc = descr->special_accessors; | |
447 | as = unw_create_addr_space_p (acc, | |
4c6b5505 UW |
448 | gdbarch_byte_order (current_gdbarch) |
449 | == BFD_ENDIAN_BIG | |
c5a27d9c JJ |
450 | ? __BIG_ENDIAN |
451 | : __LITTLE_ENDIAN); | |
452 | ||
45ecac4b | 453 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 454 | if (ret < 0) |
f43ae3f1 AS |
455 | { |
456 | unw_destroy_addr_space_p (as); | |
457 | return -1; | |
458 | } | |
c5a27d9c JJ |
459 | |
460 | uw_regnum = descr->gdb2uw (regnum); | |
461 | ||
462 | if (descr->is_fpreg (uw_regnum)) | |
463 | { | |
464 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
465 | ptr = &fpval; | |
466 | } | |
467 | else | |
468 | { | |
469 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
470 | ptr = &intval; | |
471 | } | |
472 | ||
f43ae3f1 AS |
473 | unw_destroy_addr_space_p (as); |
474 | ||
c5a27d9c JJ |
475 | if (ret < 0) |
476 | return -1; | |
477 | ||
478 | if (buf) | |
479 | memcpy (buf, ptr, register_size (current_gdbarch, regnum)); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
0e5d83e3 JJ |
484 | static int |
485 | libunwind_load (void) | |
486 | { | |
487 | void *handle; | |
488 | ||
489 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
490 | if (handle == NULL) | |
491 | return 0; | |
492 | ||
493 | /* Initialize pointers to the dynamic library functions we will use. */ | |
494 | ||
495 | unw_get_reg_p = dlsym (handle, get_reg_name); | |
496 | if (unw_get_reg_p == NULL) | |
497 | return 0; | |
498 | ||
499 | unw_get_fpreg_p = dlsym (handle, get_fpreg_name); | |
500 | if (unw_get_fpreg_p == NULL) | |
501 | return 0; | |
502 | ||
503 | unw_get_saveloc_p = dlsym (handle, get_saveloc_name); | |
504 | if (unw_get_saveloc_p == NULL) | |
505 | return 0; | |
506 | ||
c5a27d9c JJ |
507 | unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name); |
508 | if (unw_is_signal_frame_p == NULL) | |
509 | return 0; | |
510 | ||
0e5d83e3 JJ |
511 | unw_step_p = dlsym (handle, step_name); |
512 | if (unw_step_p == NULL) | |
513 | return 0; | |
514 | ||
515 | unw_init_remote_p = dlsym (handle, init_remote_name); | |
516 | if (unw_init_remote_p == NULL) | |
517 | return 0; | |
518 | ||
519 | unw_create_addr_space_p = dlsym (handle, create_addr_space_name); | |
520 | if (unw_create_addr_space_p == NULL) | |
521 | return 0; | |
522 | ||
f43ae3f1 AS |
523 | unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name); |
524 | if (unw_destroy_addr_space_p == NULL) | |
525 | return 0; | |
526 | ||
0e5d83e3 JJ |
527 | unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name); |
528 | if (unw_search_unwind_table_p == NULL) | |
529 | return 0; | |
530 | ||
531 | unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name); | |
532 | if (unw_find_dyn_list_p == NULL) | |
533 | return 0; | |
534 | ||
535 | return 1; | |
536 | } | |
537 | ||
538 | int | |
539 | libunwind_is_initialized (void) | |
540 | { | |
541 | return libunwind_initialized; | |
542 | } | |
543 | ||
544 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
545 | void _initialize_libunwind_frame (void); | |
546 | ||
547 | void | |
548 | _initialize_libunwind_frame (void) | |
549 | { | |
030f20e1 | 550 | libunwind_descr_handle = gdbarch_data_register_post_init (libunwind_descr_init); |
0e5d83e3 JJ |
551 | |
552 | libunwind_initialized = libunwind_load (); | |
553 | } |