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05e7c244 | 1 | /* Frame unwinder for ia64 frames using the libunwind library. |
0e5d83e3 | 2 | |
61baf725 | 3 | Copyright (C) 2003-2017 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" | |
d269dfc6 | 39 | #include "common/preprocessor.h" |
0e5d83e3 | 40 | |
05e7c244 JK |
41 | /* IA-64 is the only target that currently uses ia64-libunwind-tdep. |
42 | Note how UNW_TARGET, UNW_OBJ, etc. are compile time constants below. | |
b54a8fd7 PA |
43 | Those come from libunwind's headers, and are target dependent. |
44 | Also, some of libunwind's typedefs are target dependent, as e.g., | |
45 | unw_word_t. If some other target wants to use this, we will need | |
46 | to do some abstracting in order to make it possible to select which | |
47 | libunwind we're talking to at runtime (and have one per arch). */ | |
48 | ||
3e5e6e2a JB |
49 | /* The following two macros are normally defined in <endian.h>. |
50 | But systems such as ia64-hpux do not provide such header, so | |
51 | we just define them here if not already defined. */ | |
52 | #ifndef __LITTLE_ENDIAN | |
53 | #define __LITTLE_ENDIAN 1234 | |
54 | #endif | |
55 | #ifndef __BIG_ENDIAN | |
56 | #define __BIG_ENDIAN 4321 | |
57 | #endif | |
58 | ||
0e5d83e3 JJ |
59 | static int libunwind_initialized; |
60 | static struct gdbarch_data *libunwind_descr_handle; | |
61 | ||
0e5d83e3 | 62 | /* Required function pointers from libunwind. */ |
bfb0d950 AS |
63 | typedef int (unw_get_reg_p_ftype) (unw_cursor_t *, unw_regnum_t, unw_word_t *); |
64 | static unw_get_reg_p_ftype *unw_get_reg_p; | |
65 | typedef int (unw_get_fpreg_p_ftype) (unw_cursor_t *, unw_regnum_t, | |
66 | unw_fpreg_t *); | |
67 | static unw_get_fpreg_p_ftype *unw_get_fpreg_p; | |
68 | typedef int (unw_get_saveloc_p_ftype) (unw_cursor_t *, unw_regnum_t, | |
69 | unw_save_loc_t *); | |
70 | static unw_get_saveloc_p_ftype *unw_get_saveloc_p; | |
71 | typedef int (unw_is_signal_frame_p_ftype) (unw_cursor_t *); | |
72 | static unw_is_signal_frame_p_ftype *unw_is_signal_frame_p; | |
73 | typedef int (unw_step_p_ftype) (unw_cursor_t *); | |
74 | static unw_step_p_ftype *unw_step_p; | |
75 | typedef int (unw_init_remote_p_ftype) (unw_cursor_t *, unw_addr_space_t, | |
76 | void *); | |
77 | static unw_init_remote_p_ftype *unw_init_remote_p; | |
78 | typedef unw_addr_space_t (unw_create_addr_space_p_ftype) (unw_accessors_t *, | |
79 | int); | |
80 | static unw_create_addr_space_p_ftype *unw_create_addr_space_p; | |
81 | typedef void (unw_destroy_addr_space_p_ftype) (unw_addr_space_t); | |
82 | static unw_destroy_addr_space_p_ftype *unw_destroy_addr_space_p; | |
83 | typedef int (unw_search_unwind_table_p_ftype) (unw_addr_space_t, unw_word_t, | |
84 | unw_dyn_info_t *, | |
85 | unw_proc_info_t *, int, void *); | |
86 | static unw_search_unwind_table_p_ftype *unw_search_unwind_table_p; | |
87 | typedef unw_word_t (unw_find_dyn_list_p_ftype) (unw_addr_space_t, | |
88 | unw_dyn_info_t *, void *); | |
89 | static unw_find_dyn_list_p_ftype *unw_find_dyn_list_p; | |
0e5d83e3 JJ |
90 | |
91 | ||
92 | struct libunwind_frame_cache | |
93 | { | |
94 | CORE_ADDR base; | |
95 | CORE_ADDR func_addr; | |
96 | unw_cursor_t cursor; | |
272dfcfd | 97 | unw_addr_space_t as; |
0e5d83e3 JJ |
98 | }; |
99 | ||
15c1e57f JB |
100 | /* We need to qualify the function names with a platform-specific prefix |
101 | to match the names used by the libunwind library. The UNW_OBJ macro is | |
102 | provided by the libunwind.h header file. */ | |
0e5d83e3 | 103 | |
38e400fa | 104 | #ifndef LIBUNWIND_SO |
70f575cc JK |
105 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
106 | only library, not a runtime one. */ | |
75528772 JK |
107 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.8" |
108 | ||
109 | /* Provide also compatibility with older .so. The two APIs are compatible, .8 | |
110 | is only extended a bit, GDB does not use the extended API at all. */ | |
111 | #define LIBUNWIND_SO_7 "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
112 | #endif |
113 | ||
0e5d83e3 JJ |
114 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
115 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
116 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
c5a27d9c | 117 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
0e5d83e3 JJ |
118 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
119 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
120 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); | |
f43ae3f1 | 121 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
3e43a32a MS |
122 | static char *search_unwind_table_name |
123 | = STRINGIFY(UNW_OBJ(search_unwind_table)); | |
0e5d83e3 JJ |
124 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
125 | ||
126 | static struct libunwind_descr * | |
127 | libunwind_descr (struct gdbarch *gdbarch) | |
128 | { | |
bfb0d950 AS |
129 | return ((struct libunwind_descr *) |
130 | gdbarch_data (gdbarch, libunwind_descr_handle)); | |
0e5d83e3 JJ |
131 | } |
132 | ||
133 | static void * | |
134 | libunwind_descr_init (struct gdbarch *gdbarch) | |
135 | { | |
3e43a32a MS |
136 | struct libunwind_descr *descr |
137 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct libunwind_descr); | |
e0881a8e | 138 | |
0e5d83e3 JJ |
139 | return descr; |
140 | } | |
141 | ||
142 | void | |
3e43a32a MS |
143 | libunwind_frame_set_descr (struct gdbarch *gdbarch, |
144 | struct libunwind_descr *descr) | |
0e5d83e3 JJ |
145 | { |
146 | struct libunwind_descr *arch_descr; | |
147 | ||
148 | gdb_assert (gdbarch != NULL); | |
149 | ||
bfb0d950 AS |
150 | arch_descr = ((struct libunwind_descr *) |
151 | gdbarch_data (gdbarch, libunwind_descr_handle)); | |
0e5d83e3 JJ |
152 | |
153 | if (arch_descr == NULL) | |
154 | { | |
155 | /* First time here. Must initialize data area. */ | |
bfb0d950 | 156 | arch_descr = (struct libunwind_descr *) libunwind_descr_init (gdbarch); |
3e43a32a MS |
157 | deprecated_set_gdbarch_data (gdbarch, |
158 | libunwind_descr_handle, arch_descr); | |
0e5d83e3 JJ |
159 | } |
160 | ||
161 | /* Copy new descriptor info into arch descriptor. */ | |
162 | arch_descr->gdb2uw = descr->gdb2uw; | |
163 | arch_descr->uw2gdb = descr->uw2gdb; | |
164 | arch_descr->is_fpreg = descr->is_fpreg; | |
165 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 166 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
167 | } |
168 | ||
169 | static struct libunwind_frame_cache * | |
15c1e57f | 170 | libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
171 | { |
172 | unw_accessors_t *acc; | |
173 | unw_addr_space_t as; | |
174 | unw_word_t fp; | |
175 | unw_regnum_t uw_sp_regnum; | |
176 | struct libunwind_frame_cache *cache; | |
177 | struct libunwind_descr *descr; | |
15c1e57f | 178 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
179 | int i, ret; |
180 | ||
181 | if (*this_cache) | |
bfb0d950 | 182 | return (struct libunwind_frame_cache *) *this_cache; |
0e5d83e3 JJ |
183 | |
184 | /* Allocate a new cache. */ | |
185 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
186 | ||
15c1e57f | 187 | cache->func_addr = get_frame_func (this_frame); |
1b89e62f JB |
188 | if (cache->func_addr == 0) |
189 | /* This can happen when the frame corresponds to a function for which | |
190 | there is no debugging information nor any entry in the symbol table. | |
191 | This is probably a static function for which an entry in the symbol | |
192 | table was not created when the objfile got linked (observed in | |
193 | libpthread.so on ia64-hpux). | |
194 | ||
195 | The best we can do, in that case, is use the frame PC as the function | |
196 | address. We don't need to give up since we still have the unwind | |
197 | record to help us perform the unwinding. There is also another | |
198 | compelling to continue, because abandonning now means stopping | |
199 | the backtrace, which can never be helpful for the user. */ | |
200 | cache->func_addr = get_frame_pc (this_frame); | |
0e5d83e3 | 201 | |
15c1e57f JB |
202 | /* Get a libunwind cursor to the previous frame. |
203 | ||
204 | We do this by initializing a cursor. Libunwind treats a new cursor | |
205 | as the top of stack and will get the current register set via the | |
206 | libunwind register accessor. Now, we provide the platform-specific | |
207 | accessors and we set up the register accessor to use the frame | |
208 | register unwinding interfaces so that we properly get the registers | |
209 | for the current frame rather than the top. We then use the unw_step | |
210 | function to move the libunwind cursor back one frame. We can later | |
211 | use this cursor to find previous registers via the unw_get_reg | |
212 | interface which will invoke libunwind's special logic. */ | |
8cff2ae6 | 213 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 214 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 215 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 216 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 217 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
218 | ? __BIG_ENDIAN |
219 | : __LITTLE_ENDIAN); | |
220 | ||
15c1e57f | 221 | unw_init_remote_p (&cache->cursor, as, this_frame); |
c5a27d9c | 222 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
223 | { |
224 | unw_destroy_addr_space_p (as); | |
225 | return NULL; | |
226 | } | |
0e5d83e3 JJ |
227 | |
228 | /* To get base address, get sp from previous frame. */ | |
8cff2ae6 | 229 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch)); |
0e5d83e3 JJ |
230 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
231 | if (ret < 0) | |
f43ae3f1 AS |
232 | { |
233 | unw_destroy_addr_space_p (as); | |
234 | error (_("Can't get libunwind sp register.")); | |
235 | } | |
0e5d83e3 JJ |
236 | |
237 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 238 | cache->as = as; |
0e5d83e3 JJ |
239 | |
240 | *this_cache = cache; | |
241 | return cache; | |
242 | } | |
243 | ||
272dfcfd AS |
244 | void |
245 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
246 | { | |
bfb0d950 AS |
247 | struct libunwind_frame_cache *cache |
248 | = (struct libunwind_frame_cache *) this_cache; | |
e0881a8e | 249 | |
272dfcfd AS |
250 | if (cache->as) |
251 | unw_destroy_addr_space_p (cache->as); | |
252 | } | |
253 | ||
503ff15d KB |
254 | unw_word_t |
255 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 256 | { |
503ff15d | 257 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
258 | } |
259 | ||
0e5d83e3 JJ |
260 | /* Verify if there is sufficient libunwind information for the frame to use |
261 | libunwind frame unwinding. */ | |
15c1e57f JB |
262 | int |
263 | libunwind_frame_sniffer (const struct frame_unwind *self, | |
264 | struct frame_info *this_frame, void **this_cache) | |
0e5d83e3 JJ |
265 | { |
266 | unw_cursor_t cursor; | |
267 | unw_accessors_t *acc; | |
268 | unw_addr_space_t as; | |
269 | struct libunwind_descr *descr; | |
15c1e57f | 270 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
271 | int i, ret; |
272 | ||
15c1e57f JB |
273 | /* To test for libunwind unwind support, initialize a cursor to |
274 | the current frame and try to back up. We use this same method | |
275 | when setting up the frame cache (see libunwind_frame_cache()). | |
276 | If libunwind returns success for this operation, it means that | |
277 | it has found sufficient libunwind unwinding information to do so. */ | |
0e5d83e3 | 278 | |
8cff2ae6 | 279 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 280 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 281 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 282 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 283 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
284 | ? __BIG_ENDIAN |
285 | : __LITTLE_ENDIAN); | |
286 | ||
15c1e57f | 287 | ret = unw_init_remote_p (&cursor, as, this_frame); |
0e5d83e3 | 288 | |
c5a27d9c | 289 | if (ret < 0) |
f43ae3f1 AS |
290 | { |
291 | unw_destroy_addr_space_p (as); | |
15c1e57f | 292 | return 0; |
f43ae3f1 | 293 | } |
c5a27d9c JJ |
294 | |
295 | ||
296 | /* Check to see if we have libunwind info by checking if we are in a | |
297 | signal frame. If it doesn't return an error, we have libunwind info | |
298 | and can use libunwind. */ | |
299 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 300 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
301 | |
302 | if (ret < 0) | |
15c1e57f | 303 | return 0; |
0e5d83e3 | 304 | |
15c1e57f | 305 | return 1; |
0e5d83e3 JJ |
306 | } |
307 | ||
308 | void | |
15c1e57f JB |
309 | libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, |
310 | struct frame_id *this_id) | |
0e5d83e3 JJ |
311 | { |
312 | struct libunwind_frame_cache *cache = | |
15c1e57f | 313 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 314 | |
c5a27d9c JJ |
315 | if (cache != NULL) |
316 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
0e5d83e3 JJ |
317 | } |
318 | ||
15c1e57f JB |
319 | struct value * |
320 | libunwind_frame_prev_register (struct frame_info *this_frame, | |
321 | void **this_cache, int regnum) | |
0e5d83e3 JJ |
322 | { |
323 | struct libunwind_frame_cache *cache = | |
15c1e57f JB |
324 | libunwind_frame_cache (this_frame, this_cache); |
325 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
0e5d83e3 JJ |
326 | |
327 | void *ptr; | |
328 | unw_cursor_t *c; | |
329 | unw_save_loc_t sl; | |
330 | int i, ret; | |
331 | unw_word_t intval; | |
332 | unw_fpreg_t fpval; | |
333 | unw_regnum_t uw_regnum; | |
334 | struct libunwind_descr *descr; | |
15c1e57f | 335 | struct value *val = NULL; |
0e5d83e3 | 336 | |
c5a27d9c | 337 | if (cache == NULL) |
15c1e57f | 338 | return frame_unwind_got_constant (this_frame, regnum, 0); |
c5a27d9c | 339 | |
0e5d83e3 | 340 | /* Convert from gdb register number to libunwind register number. */ |
15c1e57f | 341 | descr = libunwind_descr (get_frame_arch (this_frame)); |
0e5d83e3 JJ |
342 | uw_regnum = descr->gdb2uw (regnum); |
343 | ||
344 | gdb_assert (regnum >= 0); | |
345 | ||
346 | if (!target_has_registers) | |
8a3fe4f8 | 347 | error (_("No registers.")); |
0e5d83e3 | 348 | |
0e5d83e3 | 349 | if (uw_regnum < 0) |
15c1e57f | 350 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
351 | |
352 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
15c1e57f | 353 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
354 | |
355 | switch (sl.type) | |
356 | { | |
0e5d83e3 | 357 | case UNW_SLT_MEMORY: |
15c1e57f | 358 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
0e5d83e3 JJ |
359 | break; |
360 | ||
361 | case UNW_SLT_REG: | |
15c1e57f JB |
362 | val = frame_unwind_got_register (this_frame, regnum, |
363 | descr->uw2gdb (sl.u.regnum)); | |
0e5d83e3 | 364 | break; |
15c1e57f JB |
365 | case UNW_SLT_NONE: |
366 | { | |
367 | /* The register is not stored at a specific memory address nor | |
368 | inside another register. So use libunwind to fetch the register | |
369 | value for us, and create a constant value with the result. */ | |
370 | if (descr->is_fpreg (uw_regnum)) | |
371 | { | |
372 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
373 | if (ret < 0) | |
374 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
375 | val = frame_unwind_got_bytes (this_frame, regnum, | |
376 | (gdb_byte *) &fpval); | |
377 | } | |
378 | else | |
379 | { | |
380 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
381 | if (ret < 0) | |
382 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
383 | val = frame_unwind_got_constant (this_frame, regnum, intval); | |
384 | } | |
15c1e57f JB |
385 | break; |
386 | } | |
0e5d83e3 | 387 | } |
15c1e57f JB |
388 | |
389 | return val; | |
0e5d83e3 JJ |
390 | } |
391 | ||
0e5d83e3 JJ |
392 | /* The following is a glue routine to call the libunwind unwind table |
393 | search function to get unwind information for a specified ip address. */ | |
394 | int | |
395 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
396 | void *pi, int need_unwind_info, void *args) | |
397 | { | |
bfb0d950 AS |
398 | return unw_search_unwind_table_p (*(unw_addr_space_t *) as, (unw_word_t) ip, |
399 | (unw_dyn_info_t *) di, | |
400 | (unw_proc_info_t *) pi, need_unwind_info, | |
401 | args); | |
0e5d83e3 JJ |
402 | } |
403 | ||
c5a27d9c | 404 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
15c1e57f JB |
405 | int |
406 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
407 | struct frame_info *this_frame, | |
408 | void **this_cache) | |
c5a27d9c JJ |
409 | { |
410 | unw_cursor_t cursor; | |
411 | unw_accessors_t *acc; | |
412 | unw_addr_space_t as; | |
413 | struct libunwind_descr *descr; | |
15c1e57f | 414 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
c5a27d9c JJ |
415 | int i, ret; |
416 | ||
417 | /* To test for libunwind unwind support, initialize a cursor to the | |
418 | current frame and try to back up. We use this same method when | |
419 | setting up the frame cache (see libunwind_frame_cache()). If | |
420 | libunwind returns success for this operation, it means that it | |
421 | has found sufficient libunwind unwinding information to do | |
422 | so. */ | |
423 | ||
8cff2ae6 | 424 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 425 | acc = (unw_accessors_t *) descr->accessors; |
c5a27d9c | 426 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 427 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 428 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
429 | ? __BIG_ENDIAN |
430 | : __LITTLE_ENDIAN); | |
431 | ||
15c1e57f | 432 | ret = unw_init_remote_p (&cursor, as, this_frame); |
c5a27d9c JJ |
433 | |
434 | if (ret < 0) | |
f43ae3f1 AS |
435 | { |
436 | unw_destroy_addr_space_p (as); | |
15c1e57f | 437 | return 0; |
f43ae3f1 | 438 | } |
c5a27d9c JJ |
439 | |
440 | /* Check to see if we are in a signal frame. */ | |
441 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 442 | unw_destroy_addr_space_p (as); |
c5a27d9c | 443 | if (ret > 0) |
15c1e57f | 444 | return 1; |
c5a27d9c | 445 | |
15c1e57f | 446 | return 0; |
c5a27d9c JJ |
447 | } |
448 | ||
449 | /* The following routine is for accessing special registers of the top frame. | |
450 | A special set of accessors must be given that work without frame info. | |
451 | This is used by ia64 to access the rse registers r32-r127. While they | |
452 | are usually located at BOF, this is not always true and only the libunwind | |
453 | info can decipher where they actually are. */ | |
454 | int | |
45ecac4b UW |
455 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
456 | int regnum, void *buf) | |
c5a27d9c JJ |
457 | { |
458 | unw_cursor_t cursor; | |
459 | unw_accessors_t *acc; | |
460 | unw_addr_space_t as; | |
461 | struct libunwind_descr *descr; | |
462 | int ret; | |
463 | unw_regnum_t uw_regnum; | |
464 | unw_word_t intval; | |
465 | unw_fpreg_t fpval; | |
466 | void *ptr; | |
467 | ||
468 | ||
469 | descr = libunwind_descr (gdbarch); | |
bfb0d950 | 470 | acc = (unw_accessors_t *) descr->special_accessors; |
c5a27d9c | 471 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 472 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 473 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
474 | ? __BIG_ENDIAN |
475 | : __LITTLE_ENDIAN); | |
476 | ||
45ecac4b | 477 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 478 | if (ret < 0) |
f43ae3f1 AS |
479 | { |
480 | unw_destroy_addr_space_p (as); | |
481 | return -1; | |
482 | } | |
c5a27d9c JJ |
483 | |
484 | uw_regnum = descr->gdb2uw (regnum); | |
485 | ||
486 | if (descr->is_fpreg (uw_regnum)) | |
487 | { | |
488 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
489 | ptr = &fpval; | |
490 | } | |
491 | else | |
492 | { | |
493 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
494 | ptr = &intval; | |
495 | } | |
496 | ||
f43ae3f1 AS |
497 | unw_destroy_addr_space_p (as); |
498 | ||
c5a27d9c JJ |
499 | if (ret < 0) |
500 | return -1; | |
501 | ||
502 | if (buf) | |
8cff2ae6 | 503 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
c5a27d9c JJ |
504 | |
505 | return 0; | |
506 | } | |
507 | ||
0e5d83e3 JJ |
508 | static int |
509 | libunwind_load (void) | |
510 | { | |
511 | void *handle; | |
75528772 | 512 | char *so_error = NULL; |
0e5d83e3 JJ |
513 | |
514 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
75528772 JK |
515 | if (handle == NULL) |
516 | { | |
517 | so_error = xstrdup (dlerror ()); | |
518 | #ifdef LIBUNWIND_SO_7 | |
519 | handle = dlopen (LIBUNWIND_SO_7, RTLD_NOW); | |
520 | #endif /* LIBUNWIND_SO_7 */ | |
521 | } | |
0e5d83e3 | 522 | if (handle == NULL) |
47c1316c TG |
523 | { |
524 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), | |
75528772 JK |
525 | LIBUNWIND_SO, so_error); |
526 | #ifdef LIBUNWIND_SO_7 | |
527 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), | |
528 | LIBUNWIND_SO_7, dlerror ()); | |
529 | #endif /* LIBUNWIND_SO_7 */ | |
47c1316c | 530 | } |
75528772 JK |
531 | xfree (so_error); |
532 | if (handle == NULL) | |
533 | return 0; | |
0e5d83e3 JJ |
534 | |
535 | /* Initialize pointers to the dynamic library functions we will use. */ | |
536 | ||
bfb0d950 | 537 | unw_get_reg_p = (unw_get_reg_p_ftype *) dlsym (handle, get_reg_name); |
0e5d83e3 JJ |
538 | if (unw_get_reg_p == NULL) |
539 | return 0; | |
540 | ||
bfb0d950 | 541 | unw_get_fpreg_p = (unw_get_fpreg_p_ftype *) dlsym (handle, get_fpreg_name); |
0e5d83e3 JJ |
542 | if (unw_get_fpreg_p == NULL) |
543 | return 0; | |
544 | ||
bfb0d950 AS |
545 | unw_get_saveloc_p |
546 | = (unw_get_saveloc_p_ftype *) dlsym (handle, get_saveloc_name); | |
0e5d83e3 JJ |
547 | if (unw_get_saveloc_p == NULL) |
548 | return 0; | |
549 | ||
bfb0d950 AS |
550 | unw_is_signal_frame_p |
551 | = (unw_is_signal_frame_p_ftype *) dlsym (handle, is_signal_frame_name); | |
c5a27d9c JJ |
552 | if (unw_is_signal_frame_p == NULL) |
553 | return 0; | |
554 | ||
bfb0d950 | 555 | unw_step_p = (unw_step_p_ftype *) dlsym (handle, step_name); |
0e5d83e3 JJ |
556 | if (unw_step_p == NULL) |
557 | return 0; | |
558 | ||
bfb0d950 AS |
559 | unw_init_remote_p |
560 | = (unw_init_remote_p_ftype *) dlsym (handle, init_remote_name); | |
0e5d83e3 JJ |
561 | if (unw_init_remote_p == NULL) |
562 | return 0; | |
563 | ||
bfb0d950 AS |
564 | unw_create_addr_space_p |
565 | = (unw_create_addr_space_p_ftype *) dlsym (handle, create_addr_space_name); | |
0e5d83e3 JJ |
566 | if (unw_create_addr_space_p == NULL) |
567 | return 0; | |
568 | ||
bfb0d950 AS |
569 | unw_destroy_addr_space_p |
570 | = (unw_destroy_addr_space_p_ftype *) dlsym (handle, | |
571 | destroy_addr_space_name); | |
f43ae3f1 AS |
572 | if (unw_destroy_addr_space_p == NULL) |
573 | return 0; | |
574 | ||
bfb0d950 AS |
575 | unw_search_unwind_table_p |
576 | = (unw_search_unwind_table_p_ftype *) dlsym (handle, | |
577 | search_unwind_table_name); | |
0e5d83e3 JJ |
578 | if (unw_search_unwind_table_p == NULL) |
579 | return 0; | |
580 | ||
bfb0d950 AS |
581 | unw_find_dyn_list_p |
582 | = (unw_find_dyn_list_p_ftype *) dlsym (handle, find_dyn_list_name); | |
0e5d83e3 JJ |
583 | if (unw_find_dyn_list_p == NULL) |
584 | return 0; | |
585 | ||
586 | return 1; | |
587 | } | |
588 | ||
589 | int | |
590 | libunwind_is_initialized (void) | |
591 | { | |
592 | return libunwind_initialized; | |
593 | } | |
594 | ||
0e5d83e3 JJ |
595 | void |
596 | _initialize_libunwind_frame (void) | |
597 | { | |
3e43a32a MS |
598 | libunwind_descr_handle |
599 | = gdbarch_data_register_post_init (libunwind_descr_init); | |
0e5d83e3 JJ |
600 | |
601 | libunwind_initialized = libunwind_load (); | |
602 | } |