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