Commit | Line | Data |
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05e7c244 | 1 | /* Frame unwinder for ia64 frames using the libunwind library. |
0e5d83e3 | 2 | |
618f726f | 3 | Copyright (C) 2003-2016 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 | ||
05e7c244 | 36 | #include "ia64-libunwind-tdep.h" |
0e5d83e3 JJ |
37 | |
38 | #include "complaints.h" | |
39 | ||
05e7c244 JK |
40 | /* IA-64 is the only target that currently uses ia64-libunwind-tdep. |
41 | Note how UNW_TARGET, UNW_OBJ, etc. are compile time constants below. | |
b54a8fd7 PA |
42 | Those come from libunwind's headers, and are target dependent. |
43 | Also, some of libunwind's typedefs are target dependent, as e.g., | |
44 | unw_word_t. If some other target wants to use this, we will need | |
45 | to do some abstracting in order to make it possible to select which | |
46 | libunwind we're talking to at runtime (and have one per arch). */ | |
47 | ||
3e5e6e2a JB |
48 | /* The following two macros are normally defined in <endian.h>. |
49 | But systems such as ia64-hpux do not provide such header, so | |
50 | we just define them here if not already defined. */ | |
51 | #ifndef __LITTLE_ENDIAN | |
52 | #define __LITTLE_ENDIAN 1234 | |
53 | #endif | |
54 | #ifndef __BIG_ENDIAN | |
55 | #define __BIG_ENDIAN 4321 | |
56 | #endif | |
57 | ||
0e5d83e3 JJ |
58 | static int libunwind_initialized; |
59 | static struct gdbarch_data *libunwind_descr_handle; | |
60 | ||
0e5d83e3 JJ |
61 | /* Required function pointers from libunwind. */ |
62 | static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *); | |
63 | static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *); | |
3e43a32a MS |
64 | static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t, |
65 | unw_save_loc_t *); | |
c5a27d9c | 66 | static int (*unw_is_signal_frame_p) (unw_cursor_t *); |
0e5d83e3 JJ |
67 | static int (*unw_step_p) (unw_cursor_t *); |
68 | static int (*unw_init_remote_p) (unw_cursor_t *, unw_addr_space_t, void *); | |
69 | static unw_addr_space_t (*unw_create_addr_space_p) (unw_accessors_t *, int); | |
f43ae3f1 | 70 | static void (*unw_destroy_addr_space_p) (unw_addr_space_t); |
3e43a32a MS |
71 | static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, |
72 | unw_dyn_info_t *, | |
0e5d83e3 | 73 | unw_proc_info_t *, int, void *); |
503ff15d KB |
74 | static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *, |
75 | void *); | |
0e5d83e3 JJ |
76 | |
77 | ||
78 | struct libunwind_frame_cache | |
79 | { | |
80 | CORE_ADDR base; | |
81 | CORE_ADDR func_addr; | |
82 | unw_cursor_t cursor; | |
272dfcfd | 83 | unw_addr_space_t as; |
0e5d83e3 JJ |
84 | }; |
85 | ||
15c1e57f JB |
86 | /* We need to qualify the function names with a platform-specific prefix |
87 | to match the names used by the libunwind library. The UNW_OBJ macro is | |
88 | provided by the libunwind.h header file. */ | |
0e5d83e3 JJ |
89 | #define STRINGIFY2(name) #name |
90 | #define STRINGIFY(name) STRINGIFY2(name) | |
91 | ||
38e400fa | 92 | #ifndef LIBUNWIND_SO |
70f575cc JK |
93 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
94 | only library, not a runtime one. */ | |
75528772 JK |
95 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.8" |
96 | ||
97 | /* Provide also compatibility with older .so. The two APIs are compatible, .8 | |
98 | is only extended a bit, GDB does not use the extended API at all. */ | |
99 | #define LIBUNWIND_SO_7 "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
100 | #endif |
101 | ||
0e5d83e3 JJ |
102 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
103 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
104 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
c5a27d9c | 105 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
0e5d83e3 JJ |
106 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
107 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
108 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); | |
f43ae3f1 | 109 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
3e43a32a MS |
110 | static char *search_unwind_table_name |
111 | = STRINGIFY(UNW_OBJ(search_unwind_table)); | |
0e5d83e3 JJ |
112 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
113 | ||
114 | static struct libunwind_descr * | |
115 | libunwind_descr (struct gdbarch *gdbarch) | |
116 | { | |
117 | return gdbarch_data (gdbarch, libunwind_descr_handle); | |
118 | } | |
119 | ||
120 | static void * | |
121 | libunwind_descr_init (struct gdbarch *gdbarch) | |
122 | { | |
3e43a32a MS |
123 | struct libunwind_descr *descr |
124 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct libunwind_descr); | |
e0881a8e | 125 | |
0e5d83e3 JJ |
126 | return descr; |
127 | } | |
128 | ||
129 | void | |
3e43a32a MS |
130 | libunwind_frame_set_descr (struct gdbarch *gdbarch, |
131 | struct libunwind_descr *descr) | |
0e5d83e3 JJ |
132 | { |
133 | struct libunwind_descr *arch_descr; | |
134 | ||
135 | gdb_assert (gdbarch != NULL); | |
136 | ||
137 | arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle); | |
138 | ||
139 | if (arch_descr == NULL) | |
140 | { | |
141 | /* First time here. Must initialize data area. */ | |
142 | arch_descr = libunwind_descr_init (gdbarch); | |
3e43a32a MS |
143 | deprecated_set_gdbarch_data (gdbarch, |
144 | libunwind_descr_handle, arch_descr); | |
0e5d83e3 JJ |
145 | } |
146 | ||
147 | /* Copy new descriptor info into arch descriptor. */ | |
148 | arch_descr->gdb2uw = descr->gdb2uw; | |
149 | arch_descr->uw2gdb = descr->uw2gdb; | |
150 | arch_descr->is_fpreg = descr->is_fpreg; | |
151 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 152 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
153 | } |
154 | ||
155 | static struct libunwind_frame_cache * | |
15c1e57f | 156 | libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
157 | { |
158 | unw_accessors_t *acc; | |
159 | unw_addr_space_t as; | |
160 | unw_word_t fp; | |
161 | unw_regnum_t uw_sp_regnum; | |
162 | struct libunwind_frame_cache *cache; | |
163 | struct libunwind_descr *descr; | |
15c1e57f | 164 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
165 | int i, ret; |
166 | ||
167 | if (*this_cache) | |
168 | return *this_cache; | |
169 | ||
170 | /* Allocate a new cache. */ | |
171 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
172 | ||
15c1e57f | 173 | cache->func_addr = get_frame_func (this_frame); |
1b89e62f JB |
174 | if (cache->func_addr == 0) |
175 | /* This can happen when the frame corresponds to a function for which | |
176 | there is no debugging information nor any entry in the symbol table. | |
177 | This is probably a static function for which an entry in the symbol | |
178 | table was not created when the objfile got linked (observed in | |
179 | libpthread.so on ia64-hpux). | |
180 | ||
181 | The best we can do, in that case, is use the frame PC as the function | |
182 | address. We don't need to give up since we still have the unwind | |
183 | record to help us perform the unwinding. There is also another | |
184 | compelling to continue, because abandonning now means stopping | |
185 | the backtrace, which can never be helpful for the user. */ | |
186 | cache->func_addr = get_frame_pc (this_frame); | |
0e5d83e3 | 187 | |
15c1e57f JB |
188 | /* Get a libunwind cursor to the previous frame. |
189 | ||
190 | We do this by initializing a cursor. Libunwind treats a new cursor | |
191 | as the top of stack and will get the current register set via the | |
192 | libunwind register accessor. Now, we provide the platform-specific | |
193 | accessors and we set up the register accessor to use the frame | |
194 | register unwinding interfaces so that we properly get the registers | |
195 | for the current frame rather than the top. We then use the unw_step | |
196 | function to move the libunwind cursor back one frame. We can later | |
197 | use this cursor to find previous registers via the unw_get_reg | |
198 | interface which will invoke libunwind's special logic. */ | |
8cff2ae6 | 199 | descr = libunwind_descr (gdbarch); |
0e5d83e3 JJ |
200 | acc = descr->accessors; |
201 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 202 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 203 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
204 | ? __BIG_ENDIAN |
205 | : __LITTLE_ENDIAN); | |
206 | ||
15c1e57f | 207 | unw_init_remote_p (&cache->cursor, as, this_frame); |
c5a27d9c | 208 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
209 | { |
210 | unw_destroy_addr_space_p (as); | |
211 | return NULL; | |
212 | } | |
0e5d83e3 JJ |
213 | |
214 | /* To get base address, get sp from previous frame. */ | |
8cff2ae6 | 215 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch)); |
0e5d83e3 JJ |
216 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
217 | if (ret < 0) | |
f43ae3f1 AS |
218 | { |
219 | unw_destroy_addr_space_p (as); | |
220 | error (_("Can't get libunwind sp register.")); | |
221 | } | |
0e5d83e3 JJ |
222 | |
223 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 224 | cache->as = as; |
0e5d83e3 JJ |
225 | |
226 | *this_cache = cache; | |
227 | return cache; | |
228 | } | |
229 | ||
272dfcfd AS |
230 | void |
231 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
232 | { | |
233 | struct libunwind_frame_cache *cache = this_cache; | |
e0881a8e | 234 | |
272dfcfd AS |
235 | if (cache->as) |
236 | unw_destroy_addr_space_p (cache->as); | |
237 | } | |
238 | ||
503ff15d KB |
239 | unw_word_t |
240 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 241 | { |
503ff15d | 242 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
243 | } |
244 | ||
0e5d83e3 JJ |
245 | /* Verify if there is sufficient libunwind information for the frame to use |
246 | libunwind frame unwinding. */ | |
15c1e57f JB |
247 | int |
248 | libunwind_frame_sniffer (const struct frame_unwind *self, | |
249 | struct frame_info *this_frame, void **this_cache) | |
0e5d83e3 JJ |
250 | { |
251 | unw_cursor_t cursor; | |
252 | unw_accessors_t *acc; | |
253 | unw_addr_space_t as; | |
254 | struct libunwind_descr *descr; | |
15c1e57f | 255 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
256 | int i, ret; |
257 | ||
15c1e57f JB |
258 | /* To test for libunwind unwind support, initialize a cursor to |
259 | the current frame and try to back up. We use this same method | |
260 | when setting up the frame cache (see libunwind_frame_cache()). | |
261 | If libunwind returns success for this operation, it means that | |
262 | it has found sufficient libunwind unwinding information to do so. */ | |
0e5d83e3 | 263 | |
8cff2ae6 | 264 | descr = libunwind_descr (gdbarch); |
0e5d83e3 JJ |
265 | acc = descr->accessors; |
266 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 267 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 268 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
269 | ? __BIG_ENDIAN |
270 | : __LITTLE_ENDIAN); | |
271 | ||
15c1e57f | 272 | ret = unw_init_remote_p (&cursor, as, this_frame); |
0e5d83e3 | 273 | |
c5a27d9c | 274 | if (ret < 0) |
f43ae3f1 AS |
275 | { |
276 | unw_destroy_addr_space_p (as); | |
15c1e57f | 277 | return 0; |
f43ae3f1 | 278 | } |
c5a27d9c JJ |
279 | |
280 | ||
281 | /* Check to see if we have libunwind info by checking if we are in a | |
282 | signal frame. If it doesn't return an error, we have libunwind info | |
283 | and can use libunwind. */ | |
284 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 285 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
286 | |
287 | if (ret < 0) | |
15c1e57f | 288 | return 0; |
0e5d83e3 | 289 | |
15c1e57f | 290 | return 1; |
0e5d83e3 JJ |
291 | } |
292 | ||
293 | void | |
15c1e57f JB |
294 | libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, |
295 | struct frame_id *this_id) | |
0e5d83e3 JJ |
296 | { |
297 | struct libunwind_frame_cache *cache = | |
15c1e57f | 298 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 299 | |
c5a27d9c JJ |
300 | if (cache != NULL) |
301 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
0e5d83e3 JJ |
302 | } |
303 | ||
15c1e57f JB |
304 | struct value * |
305 | libunwind_frame_prev_register (struct frame_info *this_frame, | |
306 | void **this_cache, int regnum) | |
0e5d83e3 JJ |
307 | { |
308 | struct libunwind_frame_cache *cache = | |
15c1e57f JB |
309 | libunwind_frame_cache (this_frame, this_cache); |
310 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
0e5d83e3 JJ |
311 | |
312 | void *ptr; | |
313 | unw_cursor_t *c; | |
314 | unw_save_loc_t sl; | |
315 | int i, ret; | |
316 | unw_word_t intval; | |
317 | unw_fpreg_t fpval; | |
318 | unw_regnum_t uw_regnum; | |
319 | struct libunwind_descr *descr; | |
15c1e57f | 320 | struct value *val = NULL; |
0e5d83e3 | 321 | |
c5a27d9c | 322 | if (cache == NULL) |
15c1e57f | 323 | return frame_unwind_got_constant (this_frame, regnum, 0); |
c5a27d9c | 324 | |
0e5d83e3 | 325 | /* Convert from gdb register number to libunwind register number. */ |
15c1e57f | 326 | descr = libunwind_descr (get_frame_arch (this_frame)); |
0e5d83e3 JJ |
327 | uw_regnum = descr->gdb2uw (regnum); |
328 | ||
329 | gdb_assert (regnum >= 0); | |
330 | ||
331 | if (!target_has_registers) | |
8a3fe4f8 | 332 | error (_("No registers.")); |
0e5d83e3 | 333 | |
0e5d83e3 | 334 | if (uw_regnum < 0) |
15c1e57f | 335 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
336 | |
337 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
15c1e57f | 338 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
339 | |
340 | switch (sl.type) | |
341 | { | |
0e5d83e3 | 342 | case UNW_SLT_MEMORY: |
15c1e57f | 343 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
0e5d83e3 JJ |
344 | break; |
345 | ||
346 | case UNW_SLT_REG: | |
15c1e57f JB |
347 | val = frame_unwind_got_register (this_frame, regnum, |
348 | descr->uw2gdb (sl.u.regnum)); | |
0e5d83e3 | 349 | break; |
15c1e57f JB |
350 | case UNW_SLT_NONE: |
351 | { | |
352 | /* The register is not stored at a specific memory address nor | |
353 | inside another register. So use libunwind to fetch the register | |
354 | value for us, and create a constant value with the result. */ | |
355 | if (descr->is_fpreg (uw_regnum)) | |
356 | { | |
357 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
358 | if (ret < 0) | |
359 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
360 | val = frame_unwind_got_bytes (this_frame, regnum, | |
361 | (gdb_byte *) &fpval); | |
362 | } | |
363 | else | |
364 | { | |
365 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
366 | if (ret < 0) | |
367 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
368 | val = frame_unwind_got_constant (this_frame, regnum, intval); | |
369 | } | |
15c1e57f JB |
370 | break; |
371 | } | |
0e5d83e3 | 372 | } |
15c1e57f JB |
373 | |
374 | return val; | |
0e5d83e3 JJ |
375 | } |
376 | ||
0e5d83e3 JJ |
377 | /* The following is a glue routine to call the libunwind unwind table |
378 | search function to get unwind information for a specified ip address. */ | |
379 | int | |
380 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
381 | void *pi, int need_unwind_info, void *args) | |
382 | { | |
383 | return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip, | |
384 | di, pi, need_unwind_info, args); | |
385 | } | |
386 | ||
c5a27d9c | 387 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
15c1e57f JB |
388 | int |
389 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
390 | struct frame_info *this_frame, | |
391 | void **this_cache) | |
c5a27d9c JJ |
392 | { |
393 | unw_cursor_t cursor; | |
394 | unw_accessors_t *acc; | |
395 | unw_addr_space_t as; | |
396 | struct libunwind_descr *descr; | |
15c1e57f | 397 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
c5a27d9c JJ |
398 | int i, ret; |
399 | ||
400 | /* To test for libunwind unwind support, initialize a cursor to the | |
401 | current frame and try to back up. We use this same method when | |
402 | setting up the frame cache (see libunwind_frame_cache()). If | |
403 | libunwind returns success for this operation, it means that it | |
404 | has found sufficient libunwind unwinding information to do | |
405 | so. */ | |
406 | ||
8cff2ae6 | 407 | descr = libunwind_descr (gdbarch); |
c5a27d9c JJ |
408 | acc = descr->accessors; |
409 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 410 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 411 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
412 | ? __BIG_ENDIAN |
413 | : __LITTLE_ENDIAN); | |
414 | ||
15c1e57f | 415 | ret = unw_init_remote_p (&cursor, as, this_frame); |
c5a27d9c JJ |
416 | |
417 | if (ret < 0) | |
f43ae3f1 AS |
418 | { |
419 | unw_destroy_addr_space_p (as); | |
15c1e57f | 420 | return 0; |
f43ae3f1 | 421 | } |
c5a27d9c JJ |
422 | |
423 | /* Check to see if we are in a signal frame. */ | |
424 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 425 | unw_destroy_addr_space_p (as); |
c5a27d9c | 426 | if (ret > 0) |
15c1e57f | 427 | return 1; |
c5a27d9c | 428 | |
15c1e57f | 429 | return 0; |
c5a27d9c JJ |
430 | } |
431 | ||
432 | /* The following routine is for accessing special registers of the top frame. | |
433 | A special set of accessors must be given that work without frame info. | |
434 | This is used by ia64 to access the rse registers r32-r127. While they | |
435 | are usually located at BOF, this is not always true and only the libunwind | |
436 | info can decipher where they actually are. */ | |
437 | int | |
45ecac4b UW |
438 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
439 | int regnum, void *buf) | |
c5a27d9c JJ |
440 | { |
441 | unw_cursor_t cursor; | |
442 | unw_accessors_t *acc; | |
443 | unw_addr_space_t as; | |
444 | struct libunwind_descr *descr; | |
445 | int ret; | |
446 | unw_regnum_t uw_regnum; | |
447 | unw_word_t intval; | |
448 | unw_fpreg_t fpval; | |
449 | void *ptr; | |
450 | ||
451 | ||
452 | descr = libunwind_descr (gdbarch); | |
453 | acc = descr->special_accessors; | |
454 | as = unw_create_addr_space_p (acc, | |
8cff2ae6 | 455 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 456 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
457 | ? __BIG_ENDIAN |
458 | : __LITTLE_ENDIAN); | |
459 | ||
45ecac4b | 460 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 461 | if (ret < 0) |
f43ae3f1 AS |
462 | { |
463 | unw_destroy_addr_space_p (as); | |
464 | return -1; | |
465 | } | |
c5a27d9c JJ |
466 | |
467 | uw_regnum = descr->gdb2uw (regnum); | |
468 | ||
469 | if (descr->is_fpreg (uw_regnum)) | |
470 | { | |
471 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
472 | ptr = &fpval; | |
473 | } | |
474 | else | |
475 | { | |
476 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
477 | ptr = &intval; | |
478 | } | |
479 | ||
f43ae3f1 AS |
480 | unw_destroy_addr_space_p (as); |
481 | ||
c5a27d9c JJ |
482 | if (ret < 0) |
483 | return -1; | |
484 | ||
485 | if (buf) | |
8cff2ae6 | 486 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
c5a27d9c JJ |
487 | |
488 | return 0; | |
489 | } | |
490 | ||
0e5d83e3 JJ |
491 | static int |
492 | libunwind_load (void) | |
493 | { | |
494 | void *handle; | |
75528772 | 495 | char *so_error = NULL; |
0e5d83e3 JJ |
496 | |
497 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
75528772 JK |
498 | if (handle == NULL) |
499 | { | |
500 | so_error = xstrdup (dlerror ()); | |
501 | #ifdef LIBUNWIND_SO_7 | |
502 | handle = dlopen (LIBUNWIND_SO_7, RTLD_NOW); | |
503 | #endif /* LIBUNWIND_SO_7 */ | |
504 | } | |
0e5d83e3 | 505 | if (handle == NULL) |
47c1316c TG |
506 | { |
507 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), | |
75528772 JK |
508 | LIBUNWIND_SO, so_error); |
509 | #ifdef LIBUNWIND_SO_7 | |
510 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), | |
511 | LIBUNWIND_SO_7, dlerror ()); | |
512 | #endif /* LIBUNWIND_SO_7 */ | |
47c1316c | 513 | } |
75528772 JK |
514 | xfree (so_error); |
515 | if (handle == NULL) | |
516 | return 0; | |
0e5d83e3 JJ |
517 | |
518 | /* Initialize pointers to the dynamic library functions we will use. */ | |
519 | ||
520 | unw_get_reg_p = dlsym (handle, get_reg_name); | |
521 | if (unw_get_reg_p == NULL) | |
522 | return 0; | |
523 | ||
524 | unw_get_fpreg_p = dlsym (handle, get_fpreg_name); | |
525 | if (unw_get_fpreg_p == NULL) | |
526 | return 0; | |
527 | ||
528 | unw_get_saveloc_p = dlsym (handle, get_saveloc_name); | |
529 | if (unw_get_saveloc_p == NULL) | |
530 | return 0; | |
531 | ||
c5a27d9c JJ |
532 | unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name); |
533 | if (unw_is_signal_frame_p == NULL) | |
534 | return 0; | |
535 | ||
0e5d83e3 JJ |
536 | unw_step_p = dlsym (handle, step_name); |
537 | if (unw_step_p == NULL) | |
538 | return 0; | |
539 | ||
540 | unw_init_remote_p = dlsym (handle, init_remote_name); | |
541 | if (unw_init_remote_p == NULL) | |
542 | return 0; | |
543 | ||
544 | unw_create_addr_space_p = dlsym (handle, create_addr_space_name); | |
545 | if (unw_create_addr_space_p == NULL) | |
546 | return 0; | |
547 | ||
f43ae3f1 AS |
548 | unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name); |
549 | if (unw_destroy_addr_space_p == NULL) | |
550 | return 0; | |
551 | ||
0e5d83e3 JJ |
552 | unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name); |
553 | if (unw_search_unwind_table_p == NULL) | |
554 | return 0; | |
555 | ||
556 | unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name); | |
557 | if (unw_find_dyn_list_p == NULL) | |
558 | return 0; | |
559 | ||
560 | return 1; | |
561 | } | |
562 | ||
563 | int | |
564 | libunwind_is_initialized (void) | |
565 | { | |
566 | return libunwind_initialized; | |
567 | } | |
568 | ||
569 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
570 | void _initialize_libunwind_frame (void); | |
571 | ||
572 | void | |
573 | _initialize_libunwind_frame (void) | |
574 | { | |
3e43a32a MS |
575 | libunwind_descr_handle |
576 | = gdbarch_data_register_post_init (libunwind_descr_init); | |
0e5d83e3 JJ |
577 | |
578 | libunwind_initialized = libunwind_load (); | |
579 | } |