Commit | Line | Data |
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0e5d83e3 JJ |
1 | /* Frame unwinder for frames using the libunwind library. |
2 | ||
7b6bb8da | 3 | Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 |
0fb0cc75 | 4 | Free Software Foundation, Inc. |
0e5d83e3 JJ |
5 | |
6 | Written by Jeff Johnston, contributed by Red Hat Inc. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
0e5d83e3 JJ |
13 | (at your option) any later version. |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0e5d83e3 JJ |
22 | |
23 | #include "defs.h" | |
24 | ||
25 | #include "inferior.h" | |
26 | #include "frame.h" | |
27 | #include "frame-base.h" | |
28 | #include "frame-unwind.h" | |
29 | #include "gdbcore.h" | |
30 | #include "gdbtypes.h" | |
31 | #include "symtab.h" | |
32 | #include "objfiles.h" | |
33 | #include "regcache.h" | |
34 | ||
35 | #include <dlfcn.h> | |
36 | ||
37 | #include "gdb_assert.h" | |
38 | #include "gdb_string.h" | |
39 | ||
40 | #include "libunwind-frame.h" | |
41 | ||
42 | #include "complaints.h" | |
43 | ||
44 | static int libunwind_initialized; | |
45 | static struct gdbarch_data *libunwind_descr_handle; | |
46 | ||
0e5d83e3 JJ |
47 | /* Required function pointers from libunwind. */ |
48 | static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *); | |
49 | static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *); | |
3e43a32a MS |
50 | static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t, |
51 | 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); |
3e43a32a MS |
57 | static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, |
58 | unw_dyn_info_t *, | |
0e5d83e3 | 59 | unw_proc_info_t *, int, void *); |
503ff15d KB |
60 | static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *, |
61 | void *); | |
0e5d83e3 JJ |
62 | |
63 | ||
64 | struct libunwind_frame_cache | |
65 | { | |
66 | CORE_ADDR base; | |
67 | CORE_ADDR func_addr; | |
68 | unw_cursor_t cursor; | |
272dfcfd | 69 | unw_addr_space_t as; |
0e5d83e3 JJ |
70 | }; |
71 | ||
15c1e57f JB |
72 | /* We need to qualify the function names with a platform-specific prefix |
73 | to match the names used by the libunwind library. The UNW_OBJ macro is | |
74 | provided by the libunwind.h header file. */ | |
0e5d83e3 JJ |
75 | #define STRINGIFY2(name) #name |
76 | #define STRINGIFY(name) STRINGIFY2(name) | |
77 | ||
38e400fa | 78 | #ifndef LIBUNWIND_SO |
70f575cc JK |
79 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
80 | only library, not a runtime one. */ | |
81 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
82 | #endif |
83 | ||
0e5d83e3 JJ |
84 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
85 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
86 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
c5a27d9c | 87 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
0e5d83e3 JJ |
88 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
89 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
90 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); | |
f43ae3f1 | 91 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
3e43a32a MS |
92 | static char *search_unwind_table_name |
93 | = STRINGIFY(UNW_OBJ(search_unwind_table)); | |
0e5d83e3 JJ |
94 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
95 | ||
96 | static struct libunwind_descr * | |
97 | libunwind_descr (struct gdbarch *gdbarch) | |
98 | { | |
99 | return gdbarch_data (gdbarch, libunwind_descr_handle); | |
100 | } | |
101 | ||
102 | static void * | |
103 | libunwind_descr_init (struct gdbarch *gdbarch) | |
104 | { | |
3e43a32a MS |
105 | struct libunwind_descr *descr |
106 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct libunwind_descr); | |
e0881a8e | 107 | |
0e5d83e3 JJ |
108 | return descr; |
109 | } | |
110 | ||
111 | void | |
3e43a32a MS |
112 | libunwind_frame_set_descr (struct gdbarch *gdbarch, |
113 | struct libunwind_descr *descr) | |
0e5d83e3 JJ |
114 | { |
115 | struct libunwind_descr *arch_descr; | |
116 | ||
117 | gdb_assert (gdbarch != NULL); | |
118 | ||
119 | arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle); | |
120 | ||
121 | if (arch_descr == NULL) | |
122 | { | |
123 | /* First time here. Must initialize data area. */ | |
124 | arch_descr = libunwind_descr_init (gdbarch); | |
3e43a32a MS |
125 | deprecated_set_gdbarch_data (gdbarch, |
126 | libunwind_descr_handle, arch_descr); | |
0e5d83e3 JJ |
127 | } |
128 | ||
129 | /* Copy new descriptor info into arch descriptor. */ | |
130 | arch_descr->gdb2uw = descr->gdb2uw; | |
131 | arch_descr->uw2gdb = descr->uw2gdb; | |
132 | arch_descr->is_fpreg = descr->is_fpreg; | |
133 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 134 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
135 | } |
136 | ||
137 | static struct libunwind_frame_cache * | |
15c1e57f | 138 | libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
139 | { |
140 | unw_accessors_t *acc; | |
141 | unw_addr_space_t as; | |
142 | unw_word_t fp; | |
143 | unw_regnum_t uw_sp_regnum; | |
144 | struct libunwind_frame_cache *cache; | |
145 | struct libunwind_descr *descr; | |
15c1e57f | 146 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
147 | int i, ret; |
148 | ||
149 | if (*this_cache) | |
150 | return *this_cache; | |
151 | ||
152 | /* Allocate a new cache. */ | |
153 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
154 | ||
93d42b30 DJ |
155 | /* We can assume we are unwinding a normal frame. Even if this is |
156 | for a signal trampoline, ia64 signal "trampolines" use a normal | |
157 | subroutine call to start the signal handler. */ | |
15c1e57f | 158 | cache->func_addr = get_frame_func (this_frame); |
c5a27d9c | 159 | if (cache->func_addr == 0 |
15c1e57f JB |
160 | && get_next_frame (this_frame) |
161 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) | |
c5a27d9c | 162 | return NULL; |
0e5d83e3 | 163 | |
15c1e57f JB |
164 | /* Get a libunwind cursor to the previous frame. |
165 | ||
166 | We do this by initializing a cursor. Libunwind treats a new cursor | |
167 | as the top of stack and will get the current register set via the | |
168 | libunwind register accessor. Now, we provide the platform-specific | |
169 | accessors and we set up the register accessor to use the frame | |
170 | register unwinding interfaces so that we properly get the registers | |
171 | for the current frame rather than the top. We then use the unw_step | |
172 | function to move the libunwind cursor back one frame. We can later | |
173 | use this cursor to find previous registers via the unw_get_reg | |
174 | interface which will invoke libunwind's special logic. */ | |
8cff2ae6 | 175 | descr = libunwind_descr (gdbarch); |
0e5d83e3 JJ |
176 | acc = descr->accessors; |
177 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 178 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 179 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
180 | ? __BIG_ENDIAN |
181 | : __LITTLE_ENDIAN); | |
182 | ||
15c1e57f | 183 | unw_init_remote_p (&cache->cursor, as, this_frame); |
c5a27d9c | 184 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
185 | { |
186 | unw_destroy_addr_space_p (as); | |
187 | return NULL; | |
188 | } | |
0e5d83e3 JJ |
189 | |
190 | /* To get base address, get sp from previous frame. */ | |
8cff2ae6 | 191 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch)); |
0e5d83e3 JJ |
192 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
193 | if (ret < 0) | |
f43ae3f1 AS |
194 | { |
195 | unw_destroy_addr_space_p (as); | |
196 | error (_("Can't get libunwind sp register.")); | |
197 | } | |
0e5d83e3 JJ |
198 | |
199 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 200 | cache->as = as; |
0e5d83e3 JJ |
201 | |
202 | *this_cache = cache; | |
203 | return cache; | |
204 | } | |
205 | ||
272dfcfd AS |
206 | void |
207 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
208 | { | |
209 | struct libunwind_frame_cache *cache = this_cache; | |
e0881a8e | 210 | |
272dfcfd AS |
211 | if (cache->as) |
212 | unw_destroy_addr_space_p (cache->as); | |
213 | } | |
214 | ||
503ff15d KB |
215 | unw_word_t |
216 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 217 | { |
503ff15d | 218 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
219 | } |
220 | ||
221 | static const struct frame_unwind libunwind_frame_unwind = | |
222 | { | |
223 | NORMAL_FRAME, | |
224 | libunwind_frame_this_id, | |
272dfcfd AS |
225 | libunwind_frame_prev_register, |
226 | NULL, | |
15c1e57f JB |
227 | libunwind_frame_sniffer, |
228 | libunwind_frame_dealloc_cache, | |
0e5d83e3 JJ |
229 | }; |
230 | ||
231 | /* Verify if there is sufficient libunwind information for the frame to use | |
232 | libunwind frame unwinding. */ | |
15c1e57f JB |
233 | int |
234 | libunwind_frame_sniffer (const struct frame_unwind *self, | |
235 | struct frame_info *this_frame, void **this_cache) | |
0e5d83e3 JJ |
236 | { |
237 | unw_cursor_t cursor; | |
238 | unw_accessors_t *acc; | |
239 | unw_addr_space_t as; | |
240 | struct libunwind_descr *descr; | |
15c1e57f | 241 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
242 | int i, ret; |
243 | ||
15c1e57f JB |
244 | /* To test for libunwind unwind support, initialize a cursor to |
245 | the current frame and try to back up. We use this same method | |
246 | when setting up the frame cache (see libunwind_frame_cache()). | |
247 | If libunwind returns success for this operation, it means that | |
248 | it has found sufficient libunwind unwinding information to do so. */ | |
0e5d83e3 | 249 | |
8cff2ae6 | 250 | descr = libunwind_descr (gdbarch); |
0e5d83e3 JJ |
251 | acc = descr->accessors; |
252 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 253 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 254 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
255 | ? __BIG_ENDIAN |
256 | : __LITTLE_ENDIAN); | |
257 | ||
15c1e57f | 258 | ret = unw_init_remote_p (&cursor, as, this_frame); |
0e5d83e3 | 259 | |
c5a27d9c | 260 | if (ret < 0) |
f43ae3f1 AS |
261 | { |
262 | unw_destroy_addr_space_p (as); | |
15c1e57f | 263 | return 0; |
f43ae3f1 | 264 | } |
c5a27d9c JJ |
265 | |
266 | ||
267 | /* Check to see if we have libunwind info by checking if we are in a | |
268 | signal frame. If it doesn't return an error, we have libunwind info | |
269 | and can use libunwind. */ | |
270 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 271 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
272 | |
273 | if (ret < 0) | |
15c1e57f | 274 | return 0; |
0e5d83e3 | 275 | |
15c1e57f | 276 | return 1; |
0e5d83e3 JJ |
277 | } |
278 | ||
279 | void | |
15c1e57f JB |
280 | libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, |
281 | struct frame_id *this_id) | |
0e5d83e3 JJ |
282 | { |
283 | struct libunwind_frame_cache *cache = | |
15c1e57f | 284 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 285 | |
c5a27d9c JJ |
286 | if (cache != NULL) |
287 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
0e5d83e3 JJ |
288 | } |
289 | ||
15c1e57f JB |
290 | struct value * |
291 | libunwind_frame_prev_register (struct frame_info *this_frame, | |
292 | void **this_cache, int regnum) | |
0e5d83e3 JJ |
293 | { |
294 | struct libunwind_frame_cache *cache = | |
15c1e57f JB |
295 | libunwind_frame_cache (this_frame, this_cache); |
296 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
0e5d83e3 JJ |
297 | |
298 | void *ptr; | |
299 | unw_cursor_t *c; | |
300 | unw_save_loc_t sl; | |
301 | int i, ret; | |
302 | unw_word_t intval; | |
303 | unw_fpreg_t fpval; | |
304 | unw_regnum_t uw_regnum; | |
305 | struct libunwind_descr *descr; | |
15c1e57f | 306 | struct value *val = NULL; |
0e5d83e3 | 307 | |
c5a27d9c | 308 | if (cache == NULL) |
15c1e57f | 309 | return frame_unwind_got_constant (this_frame, regnum, 0); |
c5a27d9c | 310 | |
0e5d83e3 | 311 | /* Convert from gdb register number to libunwind register number. */ |
15c1e57f | 312 | descr = libunwind_descr (get_frame_arch (this_frame)); |
0e5d83e3 JJ |
313 | uw_regnum = descr->gdb2uw (regnum); |
314 | ||
315 | gdb_assert (regnum >= 0); | |
316 | ||
317 | if (!target_has_registers) | |
8a3fe4f8 | 318 | error (_("No registers.")); |
0e5d83e3 | 319 | |
0e5d83e3 | 320 | if (uw_regnum < 0) |
15c1e57f | 321 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
322 | |
323 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
15c1e57f | 324 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
325 | |
326 | switch (sl.type) | |
327 | { | |
0e5d83e3 | 328 | case UNW_SLT_MEMORY: |
15c1e57f | 329 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
0e5d83e3 JJ |
330 | break; |
331 | ||
332 | case UNW_SLT_REG: | |
15c1e57f JB |
333 | val = frame_unwind_got_register (this_frame, regnum, |
334 | descr->uw2gdb (sl.u.regnum)); | |
0e5d83e3 | 335 | break; |
15c1e57f JB |
336 | case UNW_SLT_NONE: |
337 | { | |
338 | /* The register is not stored at a specific memory address nor | |
339 | inside another register. So use libunwind to fetch the register | |
340 | value for us, and create a constant value with the result. */ | |
341 | if (descr->is_fpreg (uw_regnum)) | |
342 | { | |
343 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
344 | if (ret < 0) | |
345 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
346 | val = frame_unwind_got_bytes (this_frame, regnum, | |
347 | (gdb_byte *) &fpval); | |
348 | } | |
349 | else | |
350 | { | |
351 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
352 | if (ret < 0) | |
353 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
354 | val = frame_unwind_got_constant (this_frame, regnum, intval); | |
355 | } | |
15c1e57f JB |
356 | break; |
357 | } | |
0e5d83e3 | 358 | } |
15c1e57f JB |
359 | |
360 | return val; | |
0e5d83e3 JJ |
361 | } |
362 | ||
363 | CORE_ADDR | |
15c1e57f | 364 | libunwind_frame_base_address (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
365 | { |
366 | struct libunwind_frame_cache *cache = | |
15c1e57f | 367 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 368 | |
c5a27d9c JJ |
369 | if (cache == NULL) |
370 | return (CORE_ADDR)NULL; | |
0e5d83e3 JJ |
371 | return cache->base; |
372 | } | |
373 | ||
374 | /* The following is a glue routine to call the libunwind unwind table | |
375 | search function to get unwind information for a specified ip address. */ | |
376 | int | |
377 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
378 | void *pi, int need_unwind_info, void *args) | |
379 | { | |
380 | return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip, | |
381 | di, pi, need_unwind_info, args); | |
382 | } | |
383 | ||
c5a27d9c | 384 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
15c1e57f JB |
385 | int |
386 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
387 | struct frame_info *this_frame, | |
388 | void **this_cache) | |
c5a27d9c JJ |
389 | { |
390 | unw_cursor_t cursor; | |
391 | unw_accessors_t *acc; | |
392 | unw_addr_space_t as; | |
393 | struct libunwind_descr *descr; | |
15c1e57f | 394 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
c5a27d9c JJ |
395 | int i, ret; |
396 | ||
397 | /* To test for libunwind unwind support, initialize a cursor to the | |
398 | current frame and try to back up. We use this same method when | |
399 | setting up the frame cache (see libunwind_frame_cache()). If | |
400 | libunwind returns success for this operation, it means that it | |
401 | has found sufficient libunwind unwinding information to do | |
402 | so. */ | |
403 | ||
8cff2ae6 | 404 | descr = libunwind_descr (gdbarch); |
c5a27d9c JJ |
405 | acc = descr->accessors; |
406 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 407 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 408 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
409 | ? __BIG_ENDIAN |
410 | : __LITTLE_ENDIAN); | |
411 | ||
15c1e57f | 412 | ret = unw_init_remote_p (&cursor, as, this_frame); |
c5a27d9c JJ |
413 | |
414 | if (ret < 0) | |
f43ae3f1 AS |
415 | { |
416 | unw_destroy_addr_space_p (as); | |
15c1e57f | 417 | return 0; |
f43ae3f1 | 418 | } |
c5a27d9c JJ |
419 | |
420 | /* Check to see if we are in a signal frame. */ | |
421 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 422 | unw_destroy_addr_space_p (as); |
c5a27d9c | 423 | if (ret > 0) |
15c1e57f | 424 | return 1; |
c5a27d9c | 425 | |
15c1e57f | 426 | return 0; |
c5a27d9c JJ |
427 | } |
428 | ||
429 | /* The following routine is for accessing special registers of the top frame. | |
430 | A special set of accessors must be given that work without frame info. | |
431 | This is used by ia64 to access the rse registers r32-r127. While they | |
432 | are usually located at BOF, this is not always true and only the libunwind | |
433 | info can decipher where they actually are. */ | |
434 | int | |
45ecac4b UW |
435 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
436 | int regnum, void *buf) | |
c5a27d9c JJ |
437 | { |
438 | unw_cursor_t cursor; | |
439 | unw_accessors_t *acc; | |
440 | unw_addr_space_t as; | |
441 | struct libunwind_descr *descr; | |
442 | int ret; | |
443 | unw_regnum_t uw_regnum; | |
444 | unw_word_t intval; | |
445 | unw_fpreg_t fpval; | |
446 | void *ptr; | |
447 | ||
448 | ||
449 | descr = libunwind_descr (gdbarch); | |
450 | acc = descr->special_accessors; | |
451 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 452 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 453 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
454 | ? __BIG_ENDIAN |
455 | : __LITTLE_ENDIAN); | |
456 | ||
45ecac4b | 457 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 458 | if (ret < 0) |
f43ae3f1 AS |
459 | { |
460 | unw_destroy_addr_space_p (as); | |
461 | return -1; | |
462 | } | |
c5a27d9c JJ |
463 | |
464 | uw_regnum = descr->gdb2uw (regnum); | |
465 | ||
466 | if (descr->is_fpreg (uw_regnum)) | |
467 | { | |
468 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
469 | ptr = &fpval; | |
470 | } | |
471 | else | |
472 | { | |
473 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
474 | ptr = &intval; | |
475 | } | |
476 | ||
f43ae3f1 AS |
477 | unw_destroy_addr_space_p (as); |
478 | ||
c5a27d9c JJ |
479 | if (ret < 0) |
480 | return -1; | |
481 | ||
482 | if (buf) | |
8cff2ae6 | 483 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
c5a27d9c JJ |
484 | |
485 | return 0; | |
486 | } | |
487 | ||
0e5d83e3 JJ |
488 | static int |
489 | libunwind_load (void) | |
490 | { | |
491 | void *handle; | |
492 | ||
493 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
494 | if (handle == NULL) | |
495 | return 0; | |
496 | ||
497 | /* Initialize pointers to the dynamic library functions we will use. */ | |
498 | ||
499 | unw_get_reg_p = dlsym (handle, get_reg_name); | |
500 | if (unw_get_reg_p == NULL) | |
501 | return 0; | |
502 | ||
503 | unw_get_fpreg_p = dlsym (handle, get_fpreg_name); | |
504 | if (unw_get_fpreg_p == NULL) | |
505 | return 0; | |
506 | ||
507 | unw_get_saveloc_p = dlsym (handle, get_saveloc_name); | |
508 | if (unw_get_saveloc_p == NULL) | |
509 | return 0; | |
510 | ||
c5a27d9c JJ |
511 | unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name); |
512 | if (unw_is_signal_frame_p == NULL) | |
513 | return 0; | |
514 | ||
0e5d83e3 JJ |
515 | unw_step_p = dlsym (handle, step_name); |
516 | if (unw_step_p == NULL) | |
517 | return 0; | |
518 | ||
519 | unw_init_remote_p = dlsym (handle, init_remote_name); | |
520 | if (unw_init_remote_p == NULL) | |
521 | return 0; | |
522 | ||
523 | unw_create_addr_space_p = dlsym (handle, create_addr_space_name); | |
524 | if (unw_create_addr_space_p == NULL) | |
525 | return 0; | |
526 | ||
f43ae3f1 AS |
527 | unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name); |
528 | if (unw_destroy_addr_space_p == NULL) | |
529 | return 0; | |
530 | ||
0e5d83e3 JJ |
531 | unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name); |
532 | if (unw_search_unwind_table_p == NULL) | |
533 | return 0; | |
534 | ||
535 | unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name); | |
536 | if (unw_find_dyn_list_p == NULL) | |
537 | return 0; | |
538 | ||
539 | return 1; | |
540 | } | |
541 | ||
542 | int | |
543 | libunwind_is_initialized (void) | |
544 | { | |
545 | return libunwind_initialized; | |
546 | } | |
547 | ||
548 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
549 | void _initialize_libunwind_frame (void); | |
550 | ||
551 | void | |
552 | _initialize_libunwind_frame (void) | |
553 | { | |
3e43a32a MS |
554 | libunwind_descr_handle |
555 | = gdbarch_data_register_post_init (libunwind_descr_init); | |
0e5d83e3 JJ |
556 | |
557 | libunwind_initialized = libunwind_load (); | |
558 | } |