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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" | |
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 | 61 | /* Required function pointers from libunwind. */ |
bfb0d950 AS |
62 | typedef int (unw_get_reg_p_ftype) (unw_cursor_t *, unw_regnum_t, unw_word_t *); |
63 | static unw_get_reg_p_ftype *unw_get_reg_p; | |
64 | typedef int (unw_get_fpreg_p_ftype) (unw_cursor_t *, unw_regnum_t, | |
65 | unw_fpreg_t *); | |
66 | static unw_get_fpreg_p_ftype *unw_get_fpreg_p; | |
67 | typedef int (unw_get_saveloc_p_ftype) (unw_cursor_t *, unw_regnum_t, | |
68 | unw_save_loc_t *); | |
69 | static unw_get_saveloc_p_ftype *unw_get_saveloc_p; | |
70 | typedef int (unw_is_signal_frame_p_ftype) (unw_cursor_t *); | |
71 | static unw_is_signal_frame_p_ftype *unw_is_signal_frame_p; | |
72 | typedef int (unw_step_p_ftype) (unw_cursor_t *); | |
73 | static unw_step_p_ftype *unw_step_p; | |
74 | typedef int (unw_init_remote_p_ftype) (unw_cursor_t *, unw_addr_space_t, | |
75 | void *); | |
76 | static unw_init_remote_p_ftype *unw_init_remote_p; | |
77 | typedef unw_addr_space_t (unw_create_addr_space_p_ftype) (unw_accessors_t *, | |
78 | int); | |
79 | static unw_create_addr_space_p_ftype *unw_create_addr_space_p; | |
80 | typedef void (unw_destroy_addr_space_p_ftype) (unw_addr_space_t); | |
81 | static unw_destroy_addr_space_p_ftype *unw_destroy_addr_space_p; | |
82 | typedef int (unw_search_unwind_table_p_ftype) (unw_addr_space_t, unw_word_t, | |
83 | unw_dyn_info_t *, | |
84 | unw_proc_info_t *, int, void *); | |
85 | static unw_search_unwind_table_p_ftype *unw_search_unwind_table_p; | |
86 | typedef unw_word_t (unw_find_dyn_list_p_ftype) (unw_addr_space_t, | |
87 | unw_dyn_info_t *, void *); | |
88 | static unw_find_dyn_list_p_ftype *unw_find_dyn_list_p; | |
0e5d83e3 JJ |
89 | |
90 | ||
91 | struct libunwind_frame_cache | |
92 | { | |
93 | CORE_ADDR base; | |
94 | CORE_ADDR func_addr; | |
95 | unw_cursor_t cursor; | |
272dfcfd | 96 | unw_addr_space_t as; |
0e5d83e3 JJ |
97 | }; |
98 | ||
15c1e57f JB |
99 | /* We need to qualify the function names with a platform-specific prefix |
100 | to match the names used by the libunwind library. The UNW_OBJ macro is | |
101 | provided by the libunwind.h header file. */ | |
0e5d83e3 JJ |
102 | #define STRINGIFY2(name) #name |
103 | #define STRINGIFY(name) STRINGIFY2(name) | |
104 | ||
38e400fa | 105 | #ifndef LIBUNWIND_SO |
70f575cc JK |
106 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
107 | only library, not a runtime one. */ | |
75528772 JK |
108 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.8" |
109 | ||
110 | /* Provide also compatibility with older .so. The two APIs are compatible, .8 | |
111 | is only extended a bit, GDB does not use the extended API at all. */ | |
112 | #define LIBUNWIND_SO_7 "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
113 | #endif |
114 | ||
0e5d83e3 JJ |
115 | static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
116 | static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
117 | static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
c5a27d9c | 118 | static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); |
0e5d83e3 JJ |
119 | static char *step_name = STRINGIFY(UNW_OBJ(step)); |
120 | static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
121 | static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space)); | |
f43ae3f1 | 122 | static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space)); |
3e43a32a MS |
123 | static char *search_unwind_table_name |
124 | = STRINGIFY(UNW_OBJ(search_unwind_table)); | |
0e5d83e3 JJ |
125 | static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
126 | ||
127 | static struct libunwind_descr * | |
128 | libunwind_descr (struct gdbarch *gdbarch) | |
129 | { | |
bfb0d950 AS |
130 | return ((struct libunwind_descr *) |
131 | gdbarch_data (gdbarch, libunwind_descr_handle)); | |
0e5d83e3 JJ |
132 | } |
133 | ||
134 | static void * | |
135 | libunwind_descr_init (struct gdbarch *gdbarch) | |
136 | { | |
3e43a32a MS |
137 | struct libunwind_descr *descr |
138 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct libunwind_descr); | |
e0881a8e | 139 | |
0e5d83e3 JJ |
140 | return descr; |
141 | } | |
142 | ||
143 | void | |
3e43a32a MS |
144 | libunwind_frame_set_descr (struct gdbarch *gdbarch, |
145 | struct libunwind_descr *descr) | |
0e5d83e3 JJ |
146 | { |
147 | struct libunwind_descr *arch_descr; | |
148 | ||
149 | gdb_assert (gdbarch != NULL); | |
150 | ||
bfb0d950 AS |
151 | arch_descr = ((struct libunwind_descr *) |
152 | gdbarch_data (gdbarch, libunwind_descr_handle)); | |
0e5d83e3 JJ |
153 | |
154 | if (arch_descr == NULL) | |
155 | { | |
156 | /* First time here. Must initialize data area. */ | |
bfb0d950 | 157 | arch_descr = (struct libunwind_descr *) libunwind_descr_init (gdbarch); |
3e43a32a MS |
158 | deprecated_set_gdbarch_data (gdbarch, |
159 | libunwind_descr_handle, arch_descr); | |
0e5d83e3 JJ |
160 | } |
161 | ||
162 | /* Copy new descriptor info into arch descriptor. */ | |
163 | arch_descr->gdb2uw = descr->gdb2uw; | |
164 | arch_descr->uw2gdb = descr->uw2gdb; | |
165 | arch_descr->is_fpreg = descr->is_fpreg; | |
166 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 167 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
168 | } |
169 | ||
170 | static struct libunwind_frame_cache * | |
15c1e57f | 171 | libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
172 | { |
173 | unw_accessors_t *acc; | |
174 | unw_addr_space_t as; | |
175 | unw_word_t fp; | |
176 | unw_regnum_t uw_sp_regnum; | |
177 | struct libunwind_frame_cache *cache; | |
178 | struct libunwind_descr *descr; | |
15c1e57f | 179 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
180 | int i, ret; |
181 | ||
182 | if (*this_cache) | |
bfb0d950 | 183 | return (struct libunwind_frame_cache *) *this_cache; |
0e5d83e3 JJ |
184 | |
185 | /* Allocate a new cache. */ | |
186 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
187 | ||
15c1e57f | 188 | cache->func_addr = get_frame_func (this_frame); |
1b89e62f JB |
189 | if (cache->func_addr == 0) |
190 | /* This can happen when the frame corresponds to a function for which | |
191 | there is no debugging information nor any entry in the symbol table. | |
192 | This is probably a static function for which an entry in the symbol | |
193 | table was not created when the objfile got linked (observed in | |
194 | libpthread.so on ia64-hpux). | |
195 | ||
196 | The best we can do, in that case, is use the frame PC as the function | |
197 | address. We don't need to give up since we still have the unwind | |
198 | record to help us perform the unwinding. There is also another | |
199 | compelling to continue, because abandonning now means stopping | |
200 | the backtrace, which can never be helpful for the user. */ | |
201 | cache->func_addr = get_frame_pc (this_frame); | |
0e5d83e3 | 202 | |
15c1e57f JB |
203 | /* Get a libunwind cursor to the previous frame. |
204 | ||
205 | We do this by initializing a cursor. Libunwind treats a new cursor | |
206 | as the top of stack and will get the current register set via the | |
207 | libunwind register accessor. Now, we provide the platform-specific | |
208 | accessors and we set up the register accessor to use the frame | |
209 | register unwinding interfaces so that we properly get the registers | |
210 | for the current frame rather than the top. We then use the unw_step | |
211 | function to move the libunwind cursor back one frame. We can later | |
212 | use this cursor to find previous registers via the unw_get_reg | |
213 | interface which will invoke libunwind's special logic. */ | |
8cff2ae6 | 214 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 215 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 216 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 217 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 218 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
219 | ? __BIG_ENDIAN |
220 | : __LITTLE_ENDIAN); | |
221 | ||
15c1e57f | 222 | unw_init_remote_p (&cache->cursor, as, this_frame); |
c5a27d9c | 223 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
224 | { |
225 | unw_destroy_addr_space_p (as); | |
226 | return NULL; | |
227 | } | |
0e5d83e3 JJ |
228 | |
229 | /* To get base address, get sp from previous frame. */ | |
8cff2ae6 | 230 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch)); |
0e5d83e3 JJ |
231 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
232 | if (ret < 0) | |
f43ae3f1 AS |
233 | { |
234 | unw_destroy_addr_space_p (as); | |
235 | error (_("Can't get libunwind sp register.")); | |
236 | } | |
0e5d83e3 JJ |
237 | |
238 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 239 | cache->as = as; |
0e5d83e3 JJ |
240 | |
241 | *this_cache = cache; | |
242 | return cache; | |
243 | } | |
244 | ||
272dfcfd AS |
245 | void |
246 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
247 | { | |
bfb0d950 AS |
248 | struct libunwind_frame_cache *cache |
249 | = (struct libunwind_frame_cache *) this_cache; | |
e0881a8e | 250 | |
272dfcfd AS |
251 | if (cache->as) |
252 | unw_destroy_addr_space_p (cache->as); | |
253 | } | |
254 | ||
503ff15d KB |
255 | unw_word_t |
256 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 257 | { |
503ff15d | 258 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
259 | } |
260 | ||
0e5d83e3 JJ |
261 | /* Verify if there is sufficient libunwind information for the frame to use |
262 | libunwind frame unwinding. */ | |
15c1e57f JB |
263 | int |
264 | libunwind_frame_sniffer (const struct frame_unwind *self, | |
265 | struct frame_info *this_frame, void **this_cache) | |
0e5d83e3 JJ |
266 | { |
267 | unw_cursor_t cursor; | |
268 | unw_accessors_t *acc; | |
269 | unw_addr_space_t as; | |
270 | struct libunwind_descr *descr; | |
15c1e57f | 271 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
0e5d83e3 JJ |
272 | int i, ret; |
273 | ||
15c1e57f JB |
274 | /* To test for libunwind unwind support, initialize a cursor to |
275 | the current frame and try to back up. We use this same method | |
276 | when setting up the frame cache (see libunwind_frame_cache()). | |
277 | If libunwind returns success for this operation, it means that | |
278 | it has found sufficient libunwind unwinding information to do so. */ | |
0e5d83e3 | 279 | |
8cff2ae6 | 280 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 281 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 282 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 283 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 284 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
285 | ? __BIG_ENDIAN |
286 | : __LITTLE_ENDIAN); | |
287 | ||
15c1e57f | 288 | ret = unw_init_remote_p (&cursor, as, this_frame); |
0e5d83e3 | 289 | |
c5a27d9c | 290 | if (ret < 0) |
f43ae3f1 AS |
291 | { |
292 | unw_destroy_addr_space_p (as); | |
15c1e57f | 293 | return 0; |
f43ae3f1 | 294 | } |
c5a27d9c JJ |
295 | |
296 | ||
297 | /* Check to see if we have libunwind info by checking if we are in a | |
298 | signal frame. If it doesn't return an error, we have libunwind info | |
299 | and can use libunwind. */ | |
300 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 301 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
302 | |
303 | if (ret < 0) | |
15c1e57f | 304 | return 0; |
0e5d83e3 | 305 | |
15c1e57f | 306 | return 1; |
0e5d83e3 JJ |
307 | } |
308 | ||
309 | void | |
15c1e57f JB |
310 | libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, |
311 | struct frame_id *this_id) | |
0e5d83e3 JJ |
312 | { |
313 | struct libunwind_frame_cache *cache = | |
15c1e57f | 314 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 315 | |
c5a27d9c JJ |
316 | if (cache != NULL) |
317 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
0e5d83e3 JJ |
318 | } |
319 | ||
15c1e57f JB |
320 | struct value * |
321 | libunwind_frame_prev_register (struct frame_info *this_frame, | |
322 | void **this_cache, int regnum) | |
0e5d83e3 JJ |
323 | { |
324 | struct libunwind_frame_cache *cache = | |
15c1e57f JB |
325 | libunwind_frame_cache (this_frame, this_cache); |
326 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
0e5d83e3 JJ |
327 | |
328 | void *ptr; | |
329 | unw_cursor_t *c; | |
330 | unw_save_loc_t sl; | |
331 | int i, ret; | |
332 | unw_word_t intval; | |
333 | unw_fpreg_t fpval; | |
334 | unw_regnum_t uw_regnum; | |
335 | struct libunwind_descr *descr; | |
15c1e57f | 336 | struct value *val = NULL; |
0e5d83e3 | 337 | |
c5a27d9c | 338 | if (cache == NULL) |
15c1e57f | 339 | return frame_unwind_got_constant (this_frame, regnum, 0); |
c5a27d9c | 340 | |
0e5d83e3 | 341 | /* Convert from gdb register number to libunwind register number. */ |
15c1e57f | 342 | descr = libunwind_descr (get_frame_arch (this_frame)); |
0e5d83e3 JJ |
343 | uw_regnum = descr->gdb2uw (regnum); |
344 | ||
345 | gdb_assert (regnum >= 0); | |
346 | ||
347 | if (!target_has_registers) | |
8a3fe4f8 | 348 | error (_("No registers.")); |
0e5d83e3 | 349 | |
0e5d83e3 | 350 | if (uw_regnum < 0) |
15c1e57f | 351 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
352 | |
353 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
15c1e57f | 354 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
355 | |
356 | switch (sl.type) | |
357 | { | |
0e5d83e3 | 358 | case UNW_SLT_MEMORY: |
15c1e57f | 359 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
0e5d83e3 JJ |
360 | break; |
361 | ||
362 | case UNW_SLT_REG: | |
15c1e57f JB |
363 | val = frame_unwind_got_register (this_frame, regnum, |
364 | descr->uw2gdb (sl.u.regnum)); | |
0e5d83e3 | 365 | break; |
15c1e57f JB |
366 | case UNW_SLT_NONE: |
367 | { | |
368 | /* The register is not stored at a specific memory address nor | |
369 | inside another register. So use libunwind to fetch the register | |
370 | value for us, and create a constant value with the result. */ | |
371 | if (descr->is_fpreg (uw_regnum)) | |
372 | { | |
373 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
374 | if (ret < 0) | |
375 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
376 | val = frame_unwind_got_bytes (this_frame, regnum, | |
377 | (gdb_byte *) &fpval); | |
378 | } | |
379 | else | |
380 | { | |
381 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
382 | if (ret < 0) | |
383 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
384 | val = frame_unwind_got_constant (this_frame, regnum, intval); | |
385 | } | |
15c1e57f JB |
386 | break; |
387 | } | |
0e5d83e3 | 388 | } |
15c1e57f JB |
389 | |
390 | return val; | |
0e5d83e3 JJ |
391 | } |
392 | ||
0e5d83e3 JJ |
393 | /* The following is a glue routine to call the libunwind unwind table |
394 | search function to get unwind information for a specified ip address. */ | |
395 | int | |
396 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
397 | void *pi, int need_unwind_info, void *args) | |
398 | { | |
bfb0d950 AS |
399 | return unw_search_unwind_table_p (*(unw_addr_space_t *) as, (unw_word_t) ip, |
400 | (unw_dyn_info_t *) di, | |
401 | (unw_proc_info_t *) pi, need_unwind_info, | |
402 | args); | |
0e5d83e3 JJ |
403 | } |
404 | ||
c5a27d9c | 405 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
15c1e57f JB |
406 | int |
407 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
408 | struct frame_info *this_frame, | |
409 | void **this_cache) | |
c5a27d9c JJ |
410 | { |
411 | unw_cursor_t cursor; | |
412 | unw_accessors_t *acc; | |
413 | unw_addr_space_t as; | |
414 | struct libunwind_descr *descr; | |
15c1e57f | 415 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
c5a27d9c JJ |
416 | int i, ret; |
417 | ||
418 | /* To test for libunwind unwind support, initialize a cursor to the | |
419 | current frame and try to back up. We use this same method when | |
420 | setting up the frame cache (see libunwind_frame_cache()). If | |
421 | libunwind returns success for this operation, it means that it | |
422 | has found sufficient libunwind unwinding information to do | |
423 | so. */ | |
424 | ||
8cff2ae6 | 425 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 426 | acc = (unw_accessors_t *) descr->accessors; |
c5a27d9c | 427 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 428 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 429 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
430 | ? __BIG_ENDIAN |
431 | : __LITTLE_ENDIAN); | |
432 | ||
15c1e57f | 433 | ret = unw_init_remote_p (&cursor, as, this_frame); |
c5a27d9c JJ |
434 | |
435 | if (ret < 0) | |
f43ae3f1 AS |
436 | { |
437 | unw_destroy_addr_space_p (as); | |
15c1e57f | 438 | return 0; |
f43ae3f1 | 439 | } |
c5a27d9c JJ |
440 | |
441 | /* Check to see if we are in a signal frame. */ | |
442 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 443 | unw_destroy_addr_space_p (as); |
c5a27d9c | 444 | if (ret > 0) |
15c1e57f | 445 | return 1; |
c5a27d9c | 446 | |
15c1e57f | 447 | return 0; |
c5a27d9c JJ |
448 | } |
449 | ||
450 | /* The following routine is for accessing special registers of the top frame. | |
451 | A special set of accessors must be given that work without frame info. | |
452 | This is used by ia64 to access the rse registers r32-r127. While they | |
453 | are usually located at BOF, this is not always true and only the libunwind | |
454 | info can decipher where they actually are. */ | |
455 | int | |
45ecac4b UW |
456 | libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache, |
457 | int regnum, void *buf) | |
c5a27d9c JJ |
458 | { |
459 | unw_cursor_t cursor; | |
460 | unw_accessors_t *acc; | |
461 | unw_addr_space_t as; | |
462 | struct libunwind_descr *descr; | |
463 | int ret; | |
464 | unw_regnum_t uw_regnum; | |
465 | unw_word_t intval; | |
466 | unw_fpreg_t fpval; | |
467 | void *ptr; | |
468 | ||
469 | ||
470 | descr = libunwind_descr (gdbarch); | |
bfb0d950 | 471 | acc = (unw_accessors_t *) descr->special_accessors; |
c5a27d9c | 472 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 473 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 474 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
475 | ? __BIG_ENDIAN |
476 | : __LITTLE_ENDIAN); | |
477 | ||
45ecac4b | 478 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 479 | if (ret < 0) |
f43ae3f1 AS |
480 | { |
481 | unw_destroy_addr_space_p (as); | |
482 | return -1; | |
483 | } | |
c5a27d9c JJ |
484 | |
485 | uw_regnum = descr->gdb2uw (regnum); | |
486 | ||
487 | if (descr->is_fpreg (uw_regnum)) | |
488 | { | |
489 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
490 | ptr = &fpval; | |
491 | } | |
492 | else | |
493 | { | |
494 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
495 | ptr = &intval; | |
496 | } | |
497 | ||
f43ae3f1 AS |
498 | unw_destroy_addr_space_p (as); |
499 | ||
c5a27d9c JJ |
500 | if (ret < 0) |
501 | return -1; | |
502 | ||
503 | if (buf) | |
8cff2ae6 | 504 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
c5a27d9c JJ |
505 | |
506 | return 0; | |
507 | } | |
508 | ||
0e5d83e3 JJ |
509 | static int |
510 | libunwind_load (void) | |
511 | { | |
512 | void *handle; | |
75528772 | 513 | char *so_error = NULL; |
0e5d83e3 JJ |
514 | |
515 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
75528772 JK |
516 | if (handle == NULL) |
517 | { | |
518 | so_error = xstrdup (dlerror ()); | |
519 | #ifdef LIBUNWIND_SO_7 | |
520 | handle = dlopen (LIBUNWIND_SO_7, RTLD_NOW); | |
521 | #endif /* LIBUNWIND_SO_7 */ | |
522 | } | |
0e5d83e3 | 523 | if (handle == NULL) |
47c1316c TG |
524 | { |
525 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), | |
75528772 JK |
526 | LIBUNWIND_SO, so_error); |
527 | #ifdef LIBUNWIND_SO_7 | |
528 | fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"), | |
529 | LIBUNWIND_SO_7, dlerror ()); | |
530 | #endif /* LIBUNWIND_SO_7 */ | |
47c1316c | 531 | } |
75528772 JK |
532 | xfree (so_error); |
533 | if (handle == NULL) | |
534 | return 0; | |
0e5d83e3 JJ |
535 | |
536 | /* Initialize pointers to the dynamic library functions we will use. */ | |
537 | ||
bfb0d950 | 538 | unw_get_reg_p = (unw_get_reg_p_ftype *) dlsym (handle, get_reg_name); |
0e5d83e3 JJ |
539 | if (unw_get_reg_p == NULL) |
540 | return 0; | |
541 | ||
bfb0d950 | 542 | unw_get_fpreg_p = (unw_get_fpreg_p_ftype *) dlsym (handle, get_fpreg_name); |
0e5d83e3 JJ |
543 | if (unw_get_fpreg_p == NULL) |
544 | return 0; | |
545 | ||
bfb0d950 AS |
546 | unw_get_saveloc_p |
547 | = (unw_get_saveloc_p_ftype *) dlsym (handle, get_saveloc_name); | |
0e5d83e3 JJ |
548 | if (unw_get_saveloc_p == NULL) |
549 | return 0; | |
550 | ||
bfb0d950 AS |
551 | unw_is_signal_frame_p |
552 | = (unw_is_signal_frame_p_ftype *) dlsym (handle, is_signal_frame_name); | |
c5a27d9c JJ |
553 | if (unw_is_signal_frame_p == NULL) |
554 | return 0; | |
555 | ||
bfb0d950 | 556 | unw_step_p = (unw_step_p_ftype *) dlsym (handle, step_name); |
0e5d83e3 JJ |
557 | if (unw_step_p == NULL) |
558 | return 0; | |
559 | ||
bfb0d950 AS |
560 | unw_init_remote_p |
561 | = (unw_init_remote_p_ftype *) dlsym (handle, init_remote_name); | |
0e5d83e3 JJ |
562 | if (unw_init_remote_p == NULL) |
563 | return 0; | |
564 | ||
bfb0d950 AS |
565 | unw_create_addr_space_p |
566 | = (unw_create_addr_space_p_ftype *) dlsym (handle, create_addr_space_name); | |
0e5d83e3 JJ |
567 | if (unw_create_addr_space_p == NULL) |
568 | return 0; | |
569 | ||
bfb0d950 AS |
570 | unw_destroy_addr_space_p |
571 | = (unw_destroy_addr_space_p_ftype *) dlsym (handle, | |
572 | destroy_addr_space_name); | |
f43ae3f1 AS |
573 | if (unw_destroy_addr_space_p == NULL) |
574 | return 0; | |
575 | ||
bfb0d950 AS |
576 | unw_search_unwind_table_p |
577 | = (unw_search_unwind_table_p_ftype *) dlsym (handle, | |
578 | search_unwind_table_name); | |
0e5d83e3 JJ |
579 | if (unw_search_unwind_table_p == NULL) |
580 | return 0; | |
581 | ||
bfb0d950 AS |
582 | unw_find_dyn_list_p |
583 | = (unw_find_dyn_list_p_ftype *) dlsym (handle, find_dyn_list_name); | |
0e5d83e3 JJ |
584 | if (unw_find_dyn_list_p == NULL) |
585 | return 0; | |
586 | ||
587 | return 1; | |
588 | } | |
589 | ||
590 | int | |
591 | libunwind_is_initialized (void) | |
592 | { | |
593 | return libunwind_initialized; | |
594 | } | |
595 | ||
596 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
597 | void _initialize_libunwind_frame (void); | |
598 | ||
599 | void | |
600 | _initialize_libunwind_frame (void) | |
601 | { | |
3e43a32a MS |
602 | libunwind_descr_handle |
603 | = gdbarch_data_register_post_init (libunwind_descr_init); | |
0e5d83e3 JJ |
604 | |
605 | libunwind_initialized = libunwind_load (); | |
606 | } |