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0e5d83e3 JJ |
1 | /* Frame unwinder for frames using the libunwind library. |
2 | ||
0b302171 | 3 | Copyright (C) 2003-2004, 2006-2012 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 | ||
b54a8fd7 PA |
43 | /* IA-64 is the only target that currently uses libunwind-frame. Note |
44 | how UNW_TARGET, UNW_OBJ, etc. are compile time constants below. | |
45 | Those come from libunwind's headers, and are target dependent. | |
46 | Also, some of libunwind's typedefs are target dependent, as e.g., | |
47 | unw_word_t. If some other target wants to use this, we will need | |
48 | to do some abstracting in order to make it possible to select which | |
49 | libunwind we're talking to at runtime (and have one per arch). */ | |
50 | ||
3e5e6e2a JB |
51 | /* The following two macros are normally defined in <endian.h>. |
52 | But systems such as ia64-hpux do not provide such header, so | |
53 | we just define them here if not already defined. */ | |
54 | #ifndef __LITTLE_ENDIAN | |
55 | #define __LITTLE_ENDIAN 1234 | |
56 | #endif | |
57 | #ifndef __BIG_ENDIAN | |
58 | #define __BIG_ENDIAN 4321 | |
59 | #endif | |
60 | ||
0e5d83e3 JJ |
61 | static int libunwind_initialized; |
62 | static struct gdbarch_data *libunwind_descr_handle; | |
63 | ||
0e5d83e3 JJ |
64 | /* Required function pointers from libunwind. */ |
65 | static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *); | |
66 | static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *); | |
3e43a32a MS |
67 | static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t, |
68 | unw_save_loc_t *); | |
c5a27d9c | 69 | static int (*unw_is_signal_frame_p) (unw_cursor_t *); |
0e5d83e3 JJ |
70 | static int (*unw_step_p) (unw_cursor_t *); |
71 | static int (*unw_init_remote_p) (unw_cursor_t *, unw_addr_space_t, void *); | |
72 | static unw_addr_space_t (*unw_create_addr_space_p) (unw_accessors_t *, int); | |
f43ae3f1 | 73 | static void (*unw_destroy_addr_space_p) (unw_addr_space_t); |
3e43a32a MS |
74 | static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, |
75 | unw_dyn_info_t *, | |
0e5d83e3 | 76 | unw_proc_info_t *, int, void *); |
503ff15d KB |
77 | static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *, |
78 | void *); | |
0e5d83e3 JJ |
79 | |
80 | ||
81 | struct libunwind_frame_cache | |
82 | { | |
83 | CORE_ADDR base; | |
84 | CORE_ADDR func_addr; | |
85 | unw_cursor_t cursor; | |
272dfcfd | 86 | unw_addr_space_t as; |
0e5d83e3 JJ |
87 | }; |
88 | ||
15c1e57f JB |
89 | /* We need to qualify the function names with a platform-specific prefix |
90 | to match the names used by the libunwind library. The UNW_OBJ macro is | |
91 | provided by the libunwind.h header file. */ | |
0e5d83e3 JJ |
92 | #define STRINGIFY2(name) #name |
93 | #define STRINGIFY(name) STRINGIFY2(name) | |
94 | ||
38e400fa | 95 | #ifndef LIBUNWIND_SO |
70f575cc JK |
96 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
97 | only library, not a runtime one. */ | |
98 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
99 | #endif |
100 | ||
0e5d83e3 JJ |
101 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
102 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
103 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
c5a27d9c | 104 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
0e5d83e3 JJ |
105 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
106 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
107 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); | |
f43ae3f1 | 108 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
3e43a32a MS |
109 | static char *search_unwind_table_name |
110 | = STRINGIFY(UNW_OBJ(search_unwind_table)); | |
0e5d83e3 JJ |
111 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
112 | ||
113 | static struct libunwind_descr * | |
114 | libunwind_descr (struct gdbarch *gdbarch) | |
115 | { | |
116 | return gdbarch_data (gdbarch, libunwind_descr_handle); | |
117 | } | |
118 | ||
119 | static void * | |
120 | libunwind_descr_init (struct gdbarch *gdbarch) | |
121 | { | |
3e43a32a MS |
122 | struct libunwind_descr *descr |
123 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct libunwind_descr); | |
e0881a8e | 124 | |
0e5d83e3 JJ |
125 | return descr; |
126 | } | |
127 | ||
128 | void | |
3e43a32a MS |
129 | libunwind_frame_set_descr (struct gdbarch *gdbarch, |
130 | struct libunwind_descr *descr) | |
0e5d83e3 JJ |
131 | { |
132 | struct libunwind_descr *arch_descr; | |
133 | ||
134 | gdb_assert (gdbarch != NULL); | |
135 | ||
136 | arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle); | |
137 | ||
138 | if (arch_descr == NULL) | |
139 | { | |
140 | /* First time here. Must initialize data area. */ | |
141 | arch_descr = libunwind_descr_init (gdbarch); | |
3e43a32a MS |
142 | deprecated_set_gdbarch_data (gdbarch, |
143 | libunwind_descr_handle, arch_descr); | |
0e5d83e3 JJ |
144 | } |
145 | ||
146 | /* Copy new descriptor info into arch descriptor. */ | |
147 | arch_descr->gdb2uw = descr->gdb2uw; | |
148 | arch_descr->uw2gdb = descr->uw2gdb; | |
149 | arch_descr->is_fpreg = descr->is_fpreg; | |
150 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 151 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
152 | } |
153 | ||
154 | static struct libunwind_frame_cache * | |
15c1e57f | 155 | libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
156 | { |
157 | unw_accessors_t *acc; | |
158 | unw_addr_space_t as; | |
159 | unw_word_t fp; | |
160 | unw_regnum_t uw_sp_regnum; | |
161 | struct libunwind_frame_cache *cache; | |
162 | struct libunwind_descr *descr; | |
15c1e57f | 163 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
164 | int i, ret; |
165 | ||
166 | if (*this_cache) | |
167 | return *this_cache; | |
168 | ||
169 | /* Allocate a new cache. */ | |
170 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
171 | ||
15c1e57f | 172 | cache->func_addr = get_frame_func (this_frame); |
1b89e62f JB |
173 | if (cache->func_addr == 0) |
174 | /* This can happen when the frame corresponds to a function for which | |
175 | there is no debugging information nor any entry in the symbol table. | |
176 | This is probably a static function for which an entry in the symbol | |
177 | table was not created when the objfile got linked (observed in | |
178 | libpthread.so on ia64-hpux). | |
179 | ||
180 | The best we can do, in that case, is use the frame PC as the function | |
181 | address. We don't need to give up since we still have the unwind | |
182 | record to help us perform the unwinding. There is also another | |
183 | compelling to continue, because abandonning now means stopping | |
184 | the backtrace, which can never be helpful for the user. */ | |
185 | cache->func_addr = get_frame_pc (this_frame); | |
0e5d83e3 | 186 | |
15c1e57f JB |
187 | /* Get a libunwind cursor to the previous frame. |
188 | ||
189 | We do this by initializing a cursor. Libunwind treats a new cursor | |
190 | as the top of stack and will get the current register set via the | |
191 | libunwind register accessor. Now, we provide the platform-specific | |
192 | accessors and we set up the register accessor to use the frame | |
193 | register unwinding interfaces so that we properly get the registers | |
194 | for the current frame rather than the top. We then use the unw_step | |
195 | function to move the libunwind cursor back one frame. We can later | |
196 | use this cursor to find previous registers via the unw_get_reg | |
197 | interface which will invoke libunwind's special logic. */ | |
8cff2ae6 | 198 | descr = libunwind_descr (gdbarch); |
0e5d83e3 JJ |
199 | acc = descr->accessors; |
200 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 201 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 202 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
203 | ? __BIG_ENDIAN |
204 | : __LITTLE_ENDIAN); | |
205 | ||
15c1e57f | 206 | unw_init_remote_p (&cache->cursor, as, this_frame); |
c5a27d9c | 207 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
208 | { |
209 | unw_destroy_addr_space_p (as); | |
210 | return NULL; | |
211 | } | |
0e5d83e3 JJ |
212 | |
213 | /* To get base address, get sp from previous frame. */ | |
8cff2ae6 | 214 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch)); |
0e5d83e3 JJ |
215 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
216 | if (ret < 0) | |
f43ae3f1 AS |
217 | { |
218 | unw_destroy_addr_space_p (as); | |
219 | error (_("Can't get libunwind sp register.")); | |
220 | } | |
0e5d83e3 JJ |
221 | |
222 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 223 | cache->as = as; |
0e5d83e3 JJ |
224 | |
225 | *this_cache = cache; | |
226 | return cache; | |
227 | } | |
228 | ||
272dfcfd AS |
229 | void |
230 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
231 | { | |
232 | struct libunwind_frame_cache *cache = this_cache; | |
e0881a8e | 233 | |
272dfcfd AS |
234 | if (cache->as) |
235 | unw_destroy_addr_space_p (cache->as); | |
236 | } | |
237 | ||
503ff15d KB |
238 | unw_word_t |
239 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 240 | { |
503ff15d | 241 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
242 | } |
243 | ||
244 | static const struct frame_unwind libunwind_frame_unwind = | |
245 | { | |
246 | NORMAL_FRAME, | |
2e1aae43 | 247 | default_frame_unwind_stop_reason, |
0e5d83e3 | 248 | libunwind_frame_this_id, |
272dfcfd AS |
249 | libunwind_frame_prev_register, |
250 | NULL, | |
15c1e57f JB |
251 | libunwind_frame_sniffer, |
252 | libunwind_frame_dealloc_cache, | |
0e5d83e3 JJ |
253 | }; |
254 | ||
255 | /* Verify if there is sufficient libunwind information for the frame to use | |
256 | libunwind frame unwinding. */ | |
15c1e57f JB |
257 | int |
258 | libunwind_frame_sniffer (const struct frame_unwind *self, | |
259 | struct frame_info *this_frame, void **this_cache) | |
0e5d83e3 JJ |
260 | { |
261 | unw_cursor_t cursor; | |
262 | unw_accessors_t *acc; | |
263 | unw_addr_space_t as; | |
264 | struct libunwind_descr *descr; | |
15c1e57f | 265 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
266 | int i, ret; |
267 | ||
15c1e57f JB |
268 | /* To test for libunwind unwind support, initialize a cursor to |
269 | the current frame and try to back up. We use this same method | |
270 | when setting up the frame cache (see libunwind_frame_cache()). | |
271 | If libunwind returns success for this operation, it means that | |
272 | it has found sufficient libunwind unwinding information to do so. */ | |
0e5d83e3 | 273 | |
8cff2ae6 | 274 | descr = libunwind_descr (gdbarch); |
0e5d83e3 JJ |
275 | acc = descr->accessors; |
276 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 277 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 278 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
279 | ? __BIG_ENDIAN |
280 | : __LITTLE_ENDIAN); | |
281 | ||
15c1e57f | 282 | ret = unw_init_remote_p (&cursor, as, this_frame); |
0e5d83e3 | 283 | |
c5a27d9c | 284 | if (ret < 0) |
f43ae3f1 AS |
285 | { |
286 | unw_destroy_addr_space_p (as); | |
15c1e57f | 287 | return 0; |
f43ae3f1 | 288 | } |
c5a27d9c JJ |
289 | |
290 | ||
291 | /* Check to see if we have libunwind info by checking if we are in a | |
292 | signal frame. If it doesn't return an error, we have libunwind info | |
293 | and can use libunwind. */ | |
294 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 295 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
296 | |
297 | if (ret < 0) | |
15c1e57f | 298 | return 0; |
0e5d83e3 | 299 | |
15c1e57f | 300 | return 1; |
0e5d83e3 JJ |
301 | } |
302 | ||
303 | void | |
15c1e57f JB |
304 | libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, |
305 | struct frame_id *this_id) | |
0e5d83e3 JJ |
306 | { |
307 | struct libunwind_frame_cache *cache = | |
15c1e57f | 308 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 309 | |
c5a27d9c JJ |
310 | if (cache != NULL) |
311 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
0e5d83e3 JJ |
312 | } |
313 | ||
15c1e57f JB |
314 | struct value * |
315 | libunwind_frame_prev_register (struct frame_info *this_frame, | |
316 | void **this_cache, int regnum) | |
0e5d83e3 JJ |
317 | { |
318 | struct libunwind_frame_cache *cache = | |
15c1e57f JB |
319 | libunwind_frame_cache (this_frame, this_cache); |
320 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
0e5d83e3 JJ |
321 | |
322 | void *ptr; | |
323 | unw_cursor_t *c; | |
324 | unw_save_loc_t sl; | |
325 | int i, ret; | |
326 | unw_word_t intval; | |
327 | unw_fpreg_t fpval; | |
328 | unw_regnum_t uw_regnum; | |
329 | struct libunwind_descr *descr; | |
15c1e57f | 330 | struct value *val = NULL; |
0e5d83e3 | 331 | |
c5a27d9c | 332 | if (cache == NULL) |
15c1e57f | 333 | return frame_unwind_got_constant (this_frame, regnum, 0); |
c5a27d9c | 334 | |
0e5d83e3 | 335 | /* Convert from gdb register number to libunwind register number. */ |
15c1e57f | 336 | descr = libunwind_descr (get_frame_arch (this_frame)); |
0e5d83e3 JJ |
337 | uw_regnum = descr->gdb2uw (regnum); |
338 | ||
339 | gdb_assert (regnum >= 0); | |
340 | ||
341 | if (!target_has_registers) | |
8a3fe4f8 | 342 | error (_("No registers.")); |
0e5d83e3 | 343 | |
0e5d83e3 | 344 | if (uw_regnum < 0) |
15c1e57f | 345 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
346 | |
347 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
15c1e57f | 348 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
349 | |
350 | switch (sl.type) | |
351 | { | |
0e5d83e3 | 352 | case UNW_SLT_MEMORY: |
15c1e57f | 353 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
0e5d83e3 JJ |
354 | break; |
355 | ||
356 | case UNW_SLT_REG: | |
15c1e57f JB |
357 | val = frame_unwind_got_register (this_frame, regnum, |
358 | descr->uw2gdb (sl.u.regnum)); | |
0e5d83e3 | 359 | break; |
15c1e57f JB |
360 | case UNW_SLT_NONE: |
361 | { | |
362 | /* The register is not stored at a specific memory address nor | |
363 | inside another register. So use libunwind to fetch the register | |
364 | value for us, and create a constant value with the result. */ | |
365 | if (descr->is_fpreg (uw_regnum)) | |
366 | { | |
367 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
368 | if (ret < 0) | |
369 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
370 | val = frame_unwind_got_bytes (this_frame, regnum, | |
371 | (gdb_byte *) &fpval); | |
372 | } | |
373 | else | |
374 | { | |
375 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
376 | if (ret < 0) | |
377 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
378 | val = frame_unwind_got_constant (this_frame, regnum, intval); | |
379 | } | |
15c1e57f JB |
380 | break; |
381 | } | |
0e5d83e3 | 382 | } |
15c1e57f JB |
383 | |
384 | return val; | |
0e5d83e3 JJ |
385 | } |
386 | ||
387 | CORE_ADDR | |
15c1e57f | 388 | libunwind_frame_base_address (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
389 | { |
390 | struct libunwind_frame_cache *cache = | |
15c1e57f | 391 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 392 | |
c5a27d9c JJ |
393 | if (cache == NULL) |
394 | return (CORE_ADDR)NULL; | |
0e5d83e3 JJ |
395 | return cache->base; |
396 | } | |
397 | ||
398 | /* The following is a glue routine to call the libunwind unwind table | |
399 | search function to get unwind information for a specified ip address. */ | |
400 | int | |
401 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
402 | void *pi, int need_unwind_info, void *args) | |
403 | { | |
404 | return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip, | |
405 | di, pi, need_unwind_info, args); | |
406 | } | |
407 | ||
c5a27d9c | 408 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
15c1e57f JB |
409 | int |
410 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
411 | struct frame_info *this_frame, | |
412 | void **this_cache) | |
c5a27d9c JJ |
413 | { |
414 | unw_cursor_t cursor; | |
415 | unw_accessors_t *acc; | |
416 | unw_addr_space_t as; | |
417 | struct libunwind_descr *descr; | |
15c1e57f | 418 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
c5a27d9c JJ |
419 | int i, ret; |
420 | ||
421 | /* To test for libunwind unwind support, initialize a cursor to the | |
422 | current frame and try to back up. We use this same method when | |
423 | setting up the frame cache (see libunwind_frame_cache()). If | |
424 | libunwind returns success for this operation, it means that it | |
425 | has found sufficient libunwind unwinding information to do | |
426 | so. */ | |
427 | ||
8cff2ae6 | 428 | descr = libunwind_descr (gdbarch); |
c5a27d9c JJ |
429 | acc = descr->accessors; |
430 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 431 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 432 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
433 | ? __BIG_ENDIAN |
434 | : __LITTLE_ENDIAN); | |
435 | ||
15c1e57f | 436 | ret = unw_init_remote_p (&cursor, as, this_frame); |
c5a27d9c JJ |
437 | |
438 | if (ret < 0) | |
f43ae3f1 AS |
439 | { |
440 | unw_destroy_addr_space_p (as); | |
15c1e57f | 441 | return 0; |
f43ae3f1 | 442 | } |
c5a27d9c JJ |
443 | |
444 | /* Check to see if we are in a signal frame. */ | |
445 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 446 | unw_destroy_addr_space_p (as); |
c5a27d9c | 447 | if (ret > 0) |
15c1e57f | 448 | return 1; |
c5a27d9c | 449 | |
15c1e57f | 450 | return 0; |
c5a27d9c JJ |
451 | } |
452 | ||
453 | /* The following routine is for accessing special registers of the top frame. | |
454 | A special set of accessors must be given that work without frame info. | |
455 | This is used by ia64 to access the rse registers r32-r127. While they | |
456 | are usually located at BOF, this is not always true and only the libunwind | |
457 | info can decipher where they actually are. */ | |
458 | int | |
45ecac4b UW |
459 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
460 | int regnum, void *buf) | |
c5a27d9c JJ |
461 | { |
462 | unw_cursor_t cursor; | |
463 | unw_accessors_t *acc; | |
464 | unw_addr_space_t as; | |
465 | struct libunwind_descr *descr; | |
466 | int ret; | |
467 | unw_regnum_t uw_regnum; | |
468 | unw_word_t intval; | |
469 | unw_fpreg_t fpval; | |
470 | void *ptr; | |
471 | ||
472 | ||
473 | descr = libunwind_descr (gdbarch); | |
474 | acc = descr->special_accessors; | |
475 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 476 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 477 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
478 | ? __BIG_ENDIAN |
479 | : __LITTLE_ENDIAN); | |
480 | ||
45ecac4b | 481 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 482 | if (ret < 0) |
f43ae3f1 AS |
483 | { |
484 | unw_destroy_addr_space_p (as); | |
485 | return -1; | |
486 | } | |
c5a27d9c JJ |
487 | |
488 | uw_regnum = descr->gdb2uw (regnum); | |
489 | ||
490 | if (descr->is_fpreg (uw_regnum)) | |
491 | { | |
492 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
493 | ptr = &fpval; | |
494 | } | |
495 | else | |
496 | { | |
497 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
498 | ptr = &intval; | |
499 | } | |
500 | ||
f43ae3f1 AS |
501 | unw_destroy_addr_space_p (as); |
502 | ||
c5a27d9c JJ |
503 | if (ret < 0) |
504 | return -1; | |
505 | ||
506 | if (buf) | |
8cff2ae6 | 507 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
c5a27d9c JJ |
508 | |
509 | return 0; | |
510 | } | |
511 | ||
0e5d83e3 JJ |
512 | static int |
513 | libunwind_load (void) | |
514 | { | |
515 | void *handle; | |
516 | ||
517 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
518 | if (handle == NULL) | |
47c1316c TG |
519 | { |
520 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), | |
521 | LIBUNWIND_SO, dlerror ()); | |
522 | return 0; | |
523 | } | |
0e5d83e3 JJ |
524 | |
525 | /* Initialize pointers to the dynamic library functions we will use. */ | |
526 | ||
527 | unw_get_reg_p = dlsym (handle, get_reg_name); | |
528 | if (unw_get_reg_p == NULL) | |
529 | return 0; | |
530 | ||
531 | unw_get_fpreg_p = dlsym (handle, get_fpreg_name); | |
532 | if (unw_get_fpreg_p == NULL) | |
533 | return 0; | |
534 | ||
535 | unw_get_saveloc_p = dlsym (handle, get_saveloc_name); | |
536 | if (unw_get_saveloc_p == NULL) | |
537 | return 0; | |
538 | ||
c5a27d9c JJ |
539 | unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name); |
540 | if (unw_is_signal_frame_p == NULL) | |
541 | return 0; | |
542 | ||
0e5d83e3 JJ |
543 | unw_step_p = dlsym (handle, step_name); |
544 | if (unw_step_p == NULL) | |
545 | return 0; | |
546 | ||
547 | unw_init_remote_p = dlsym (handle, init_remote_name); | |
548 | if (unw_init_remote_p == NULL) | |
549 | return 0; | |
550 | ||
551 | unw_create_addr_space_p = dlsym (handle, create_addr_space_name); | |
552 | if (unw_create_addr_space_p == NULL) | |
553 | return 0; | |
554 | ||
f43ae3f1 AS |
555 | unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name); |
556 | if (unw_destroy_addr_space_p == NULL) | |
557 | return 0; | |
558 | ||
0e5d83e3 JJ |
559 | unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name); |
560 | if (unw_search_unwind_table_p == NULL) | |
561 | return 0; | |
562 | ||
563 | unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name); | |
564 | if (unw_find_dyn_list_p == NULL) | |
565 | return 0; | |
566 | ||
567 | return 1; | |
568 | } | |
569 | ||
570 | int | |
571 | libunwind_is_initialized (void) | |
572 | { | |
573 | return libunwind_initialized; | |
574 | } | |
575 | ||
576 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
577 | void _initialize_libunwind_frame (void); | |
578 | ||
579 | void | |
580 | _initialize_libunwind_frame (void) | |
581 | { | |
3e43a32a MS |
582 | libunwind_descr_handle |
583 | = gdbarch_data_register_post_init (libunwind_descr_init); | |
0e5d83e3 JJ |
584 | |
585 | libunwind_initialized = libunwind_load (); | |
586 | } |