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05e7c244 | 1 | /* Frame unwinder for ia64 frames using the libunwind library. |
0e5d83e3 | 2 | |
1d506c26 | 3 | Copyright (C) 2003-2024 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 | 21 | |
0e5d83e3 JJ |
22 | |
23 | #include "inferior.h" | |
24 | #include "frame.h" | |
25 | #include "frame-base.h" | |
26 | #include "frame-unwind.h" | |
27 | #include "gdbcore.h" | |
28 | #include "gdbtypes.h" | |
29 | #include "symtab.h" | |
30 | #include "objfiles.h" | |
31 | #include "regcache.h" | |
32 | ||
33 | #include <dlfcn.h> | |
34 | ||
05e7c244 | 35 | #include "ia64-libunwind-tdep.h" |
0e5d83e3 | 36 | |
268a13a5 | 37 | #include "gdbsupport/preprocessor.h" |
0e5d83e3 | 38 | |
05e7c244 JK |
39 | /* IA-64 is the only target that currently uses ia64-libunwind-tdep. |
40 | Note how UNW_TARGET, UNW_OBJ, etc. are compile time constants below. | |
b54a8fd7 PA |
41 | Those come from libunwind's headers, and are target dependent. |
42 | Also, some of libunwind's typedefs are target dependent, as e.g., | |
43 | unw_word_t. If some other target wants to use this, we will need | |
44 | to do some abstracting in order to make it possible to select which | |
45 | libunwind we're talking to at runtime (and have one per arch). */ | |
46 | ||
3e5e6e2a JB |
47 | /* The following two macros are normally defined in <endian.h>. |
48 | But systems such as ia64-hpux do not provide such header, so | |
49 | we just define them here if not already defined. */ | |
50 | #ifndef __LITTLE_ENDIAN | |
51 | #define __LITTLE_ENDIAN 1234 | |
52 | #endif | |
53 | #ifndef __BIG_ENDIAN | |
54 | #define __BIG_ENDIAN 4321 | |
55 | #endif | |
56 | ||
0e5d83e3 | 57 | static int libunwind_initialized; |
cb275538 | 58 | static const registry<gdbarch>::key<libunwind_descr> libunwind_descr_handle; |
0e5d83e3 | 59 | |
0e5d83e3 | 60 | /* Required function pointers from libunwind. */ |
bfb0d950 AS |
61 | typedef int (unw_get_reg_p_ftype) (unw_cursor_t *, unw_regnum_t, unw_word_t *); |
62 | static unw_get_reg_p_ftype *unw_get_reg_p; | |
63 | typedef int (unw_get_fpreg_p_ftype) (unw_cursor_t *, unw_regnum_t, | |
64 | unw_fpreg_t *); | |
65 | static unw_get_fpreg_p_ftype *unw_get_fpreg_p; | |
66 | typedef int (unw_get_saveloc_p_ftype) (unw_cursor_t *, unw_regnum_t, | |
67 | unw_save_loc_t *); | |
68 | static unw_get_saveloc_p_ftype *unw_get_saveloc_p; | |
69 | typedef int (unw_is_signal_frame_p_ftype) (unw_cursor_t *); | |
70 | static unw_is_signal_frame_p_ftype *unw_is_signal_frame_p; | |
71 | typedef int (unw_step_p_ftype) (unw_cursor_t *); | |
72 | static unw_step_p_ftype *unw_step_p; | |
73 | typedef int (unw_init_remote_p_ftype) (unw_cursor_t *, unw_addr_space_t, | |
74 | void *); | |
75 | static unw_init_remote_p_ftype *unw_init_remote_p; | |
76 | typedef unw_addr_space_t (unw_create_addr_space_p_ftype) (unw_accessors_t *, | |
77 | int); | |
78 | static unw_create_addr_space_p_ftype *unw_create_addr_space_p; | |
79 | typedef void (unw_destroy_addr_space_p_ftype) (unw_addr_space_t); | |
80 | static unw_destroy_addr_space_p_ftype *unw_destroy_addr_space_p; | |
81 | typedef int (unw_search_unwind_table_p_ftype) (unw_addr_space_t, unw_word_t, | |
82 | unw_dyn_info_t *, | |
83 | unw_proc_info_t *, int, void *); | |
84 | static unw_search_unwind_table_p_ftype *unw_search_unwind_table_p; | |
85 | typedef unw_word_t (unw_find_dyn_list_p_ftype) (unw_addr_space_t, | |
86 | unw_dyn_info_t *, void *); | |
87 | static unw_find_dyn_list_p_ftype *unw_find_dyn_list_p; | |
0e5d83e3 JJ |
88 | |
89 | ||
90 | struct libunwind_frame_cache | |
91 | { | |
92 | CORE_ADDR base; | |
93 | CORE_ADDR func_addr; | |
94 | unw_cursor_t cursor; | |
272dfcfd | 95 | unw_addr_space_t as; |
0e5d83e3 JJ |
96 | }; |
97 | ||
15c1e57f JB |
98 | /* We need to qualify the function names with a platform-specific prefix |
99 | to match the names used by the libunwind library. The UNW_OBJ macro is | |
100 | provided by the libunwind.h header file. */ | |
0e5d83e3 | 101 | |
38e400fa | 102 | #ifndef LIBUNWIND_SO |
70f575cc JK |
103 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
104 | only library, not a runtime one. */ | |
75528772 JK |
105 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.8" |
106 | ||
107 | /* Provide also compatibility with older .so. The two APIs are compatible, .8 | |
108 | is only extended a bit, GDB does not use the extended API at all. */ | |
109 | #define LIBUNWIND_SO_7 "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
110 | #endif |
111 | ||
e83f4d97 SM |
112 | static const char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
113 | static const char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
114 | static const char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
115 | static const char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); | |
116 | static const char *step_name = STRINGIFY(UNW_OBJ(step)); | |
117 | static const char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
118 | static const char *create_addr_space_name | |
119 | = STRINGIFY(UNW_OBJ(create_addr_space)); | |
120 | static const char *destroy_addr_space_name | |
121 | = STRINGIFY(UNW_OBJ(destroy_addr_space)); | |
122 | static const char *search_unwind_table_name | |
3e43a32a | 123 | = STRINGIFY(UNW_OBJ(search_unwind_table)); |
e83f4d97 | 124 | static const char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
0e5d83e3 JJ |
125 | |
126 | static struct libunwind_descr * | |
127 | libunwind_descr (struct gdbarch *gdbarch) | |
128 | { | |
cb275538 TT |
129 | struct libunwind_descr *result = libunwind_descr_handle.get (gdbarch); |
130 | if (result == nullptr) | |
131 | result = libunwind_descr_handle.emplace (gdbarch); | |
132 | return result; | |
0e5d83e3 JJ |
133 | } |
134 | ||
135 | void | |
3e43a32a MS |
136 | libunwind_frame_set_descr (struct gdbarch *gdbarch, |
137 | struct libunwind_descr *descr) | |
0e5d83e3 JJ |
138 | { |
139 | struct libunwind_descr *arch_descr; | |
140 | ||
141 | gdb_assert (gdbarch != NULL); | |
142 | ||
cb275538 | 143 | arch_descr = libunwind_descr (gdbarch); |
3bc98c0c | 144 | gdb_assert (arch_descr != NULL); |
0e5d83e3 JJ |
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 * | |
8480a37e | 155 | libunwind_frame_cache (const frame_info_ptr &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); |
b4792091 | 164 | int ret; |
0e5d83e3 JJ |
165 | |
166 | if (*this_cache) | |
bfb0d950 | 167 | return (struct libunwind_frame_cache *) *this_cache; |
0e5d83e3 JJ |
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 | |
85102364 | 183 | compelling to continue, because abandoning now means stopping |
1b89e62f JB |
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); |
bfb0d950 | 199 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 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 | 229 | void |
bd2b40ac | 230 | libunwind_frame_dealloc_cache (frame_info_ptr self, void *this_cache) |
272dfcfd | 231 | { |
bfb0d950 AS |
232 | struct libunwind_frame_cache *cache |
233 | = (struct libunwind_frame_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, | |
8480a37e | 249 | const frame_info_ptr &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); |
b4792091 | 256 | int ret; |
0e5d83e3 | 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); |
bfb0d950 | 265 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 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 | |
8480a37e | 294 | libunwind_frame_this_id (const frame_info_ptr &this_frame, void **this_cache, |
dda83cd7 | 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 | 304 | struct value * |
8480a37e | 305 | libunwind_frame_prev_register (const frame_info_ptr &this_frame, |
dda83cd7 | 306 | void **this_cache, int regnum) |
0e5d83e3 JJ |
307 | { |
308 | struct libunwind_frame_cache *cache = | |
15c1e57f | 309 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 310 | |
0e5d83e3 | 311 | unw_save_loc_t sl; |
b4792091 | 312 | int ret; |
0e5d83e3 JJ |
313 | unw_word_t intval; |
314 | unw_fpreg_t fpval; | |
315 | unw_regnum_t uw_regnum; | |
316 | struct libunwind_descr *descr; | |
15c1e57f | 317 | struct value *val = NULL; |
0e5d83e3 | 318 | |
c5a27d9c | 319 | if (cache == NULL) |
15c1e57f | 320 | return frame_unwind_got_constant (this_frame, regnum, 0); |
c5a27d9c | 321 | |
0e5d83e3 | 322 | /* Convert from gdb register number to libunwind register number. */ |
15c1e57f | 323 | descr = libunwind_descr (get_frame_arch (this_frame)); |
0e5d83e3 JJ |
324 | uw_regnum = descr->gdb2uw (regnum); |
325 | ||
326 | gdb_assert (regnum >= 0); | |
327 | ||
9dccd06e | 328 | if (!target_has_registers ()) |
8a3fe4f8 | 329 | error (_("No registers.")); |
0e5d83e3 | 330 | |
0e5d83e3 | 331 | if (uw_regnum < 0) |
15c1e57f | 332 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
333 | |
334 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
15c1e57f | 335 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
336 | |
337 | switch (sl.type) | |
338 | { | |
0e5d83e3 | 339 | case UNW_SLT_MEMORY: |
15c1e57f | 340 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
0e5d83e3 JJ |
341 | break; |
342 | ||
343 | case UNW_SLT_REG: | |
15c1e57f | 344 | val = frame_unwind_got_register (this_frame, regnum, |
dda83cd7 | 345 | descr->uw2gdb (sl.u.regnum)); |
0e5d83e3 | 346 | break; |
15c1e57f JB |
347 | case UNW_SLT_NONE: |
348 | { | |
dda83cd7 SM |
349 | /* The register is not stored at a specific memory address nor |
350 | inside another register. So use libunwind to fetch the register | |
351 | value for us, and create a constant value with the result. */ | |
352 | if (descr->is_fpreg (uw_regnum)) | |
353 | { | |
354 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
355 | if (ret < 0) | |
356 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
357 | val = frame_unwind_got_bytes (this_frame, regnum, | |
358 | (gdb_byte *) &fpval); | |
359 | } | |
360 | else | |
361 | { | |
362 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
363 | if (ret < 0) | |
364 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
365 | val = frame_unwind_got_constant (this_frame, regnum, intval); | |
366 | } | |
367 | break; | |
15c1e57f | 368 | } |
0e5d83e3 | 369 | } |
15c1e57f JB |
370 | |
371 | return val; | |
0e5d83e3 JJ |
372 | } |
373 | ||
0e5d83e3 JJ |
374 | /* The following is a glue routine to call the libunwind unwind table |
375 | search function to get unwind information for a specified ip address. */ | |
376 | int | |
377 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
378 | void *pi, int need_unwind_info, void *args) | |
379 | { | |
bfb0d950 AS |
380 | return unw_search_unwind_table_p (*(unw_addr_space_t *) as, (unw_word_t) ip, |
381 | (unw_dyn_info_t *) di, | |
382 | (unw_proc_info_t *) pi, need_unwind_info, | |
383 | args); | |
0e5d83e3 JJ |
384 | } |
385 | ||
c5a27d9c | 386 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
15c1e57f JB |
387 | int |
388 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
8480a37e | 389 | const frame_info_ptr &this_frame, |
dda83cd7 | 390 | void **this_cache) |
c5a27d9c JJ |
391 | { |
392 | unw_cursor_t cursor; | |
393 | unw_accessors_t *acc; | |
394 | unw_addr_space_t as; | |
395 | struct libunwind_descr *descr; | |
15c1e57f | 396 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b4792091 | 397 | int ret; |
c5a27d9c JJ |
398 | |
399 | /* To test for libunwind unwind support, initialize a cursor to the | |
400 | current frame and try to back up. We use this same method when | |
401 | setting up the frame cache (see libunwind_frame_cache()). If | |
402 | libunwind returns success for this operation, it means that it | |
403 | has found sufficient libunwind unwinding information to do | |
404 | so. */ | |
405 | ||
8cff2ae6 | 406 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 407 | acc = (unw_accessors_t *) descr->accessors; |
c5a27d9c | 408 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 409 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 410 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
411 | ? __BIG_ENDIAN |
412 | : __LITTLE_ENDIAN); | |
413 | ||
15c1e57f | 414 | ret = unw_init_remote_p (&cursor, as, this_frame); |
c5a27d9c JJ |
415 | |
416 | if (ret < 0) | |
f43ae3f1 AS |
417 | { |
418 | unw_destroy_addr_space_p (as); | |
15c1e57f | 419 | return 0; |
f43ae3f1 | 420 | } |
c5a27d9c JJ |
421 | |
422 | /* Check to see if we are in a signal frame. */ | |
423 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 424 | unw_destroy_addr_space_p (as); |
c5a27d9c | 425 | if (ret > 0) |
15c1e57f | 426 | return 1; |
c5a27d9c | 427 | |
15c1e57f | 428 | return 0; |
c5a27d9c JJ |
429 | } |
430 | ||
431 | /* The following routine is for accessing special registers of the top frame. | |
432 | A special set of accessors must be given that work without frame info. | |
433 | This is used by ia64 to access the rse registers r32-r127. While they | |
434 | are usually located at BOF, this is not always true and only the libunwind | |
435 | info can decipher where they actually are. */ | |
436 | int | |
933522d1 | 437 | libunwind_get_reg_special (struct gdbarch *gdbarch, readable_regcache *regcache, |
45ecac4b | 438 | int regnum, void *buf) |
c5a27d9c JJ |
439 | { |
440 | unw_cursor_t cursor; | |
441 | unw_accessors_t *acc; | |
442 | unw_addr_space_t as; | |
443 | struct libunwind_descr *descr; | |
444 | int ret; | |
445 | unw_regnum_t uw_regnum; | |
446 | unw_word_t intval; | |
447 | unw_fpreg_t fpval; | |
448 | void *ptr; | |
449 | ||
450 | ||
451 | descr = libunwind_descr (gdbarch); | |
bfb0d950 | 452 | acc = (unw_accessors_t *) descr->special_accessors; |
c5a27d9c | 453 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 454 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 455 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
456 | ? __BIG_ENDIAN |
457 | : __LITTLE_ENDIAN); | |
458 | ||
45ecac4b | 459 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 460 | if (ret < 0) |
f43ae3f1 AS |
461 | { |
462 | unw_destroy_addr_space_p (as); | |
463 | return -1; | |
464 | } | |
c5a27d9c JJ |
465 | |
466 | uw_regnum = descr->gdb2uw (regnum); | |
467 | ||
468 | if (descr->is_fpreg (uw_regnum)) | |
469 | { | |
470 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
471 | ptr = &fpval; | |
472 | } | |
473 | else | |
474 | { | |
475 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
476 | ptr = &intval; | |
477 | } | |
478 | ||
f43ae3f1 AS |
479 | unw_destroy_addr_space_p (as); |
480 | ||
c5a27d9c JJ |
481 | if (ret < 0) |
482 | return -1; | |
483 | ||
484 | if (buf) | |
8cff2ae6 | 485 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
c5a27d9c JJ |
486 | |
487 | return 0; | |
488 | } | |
489 | ||
0e5d83e3 JJ |
490 | static int |
491 | libunwind_load (void) | |
492 | { | |
493 | void *handle; | |
75528772 | 494 | char *so_error = NULL; |
0e5d83e3 JJ |
495 | |
496 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
75528772 JK |
497 | if (handle == NULL) |
498 | { | |
499 | so_error = xstrdup (dlerror ()); | |
500 | #ifdef LIBUNWIND_SO_7 | |
501 | handle = dlopen (LIBUNWIND_SO_7, RTLD_NOW); | |
502 | #endif /* LIBUNWIND_SO_7 */ | |
503 | } | |
0e5d83e3 | 504 | if (handle == NULL) |
47c1316c | 505 | { |
6cb06a8c TT |
506 | gdb_printf (gdb_stderr, _("[GDB failed to load %s: %s]\n"), |
507 | LIBUNWIND_SO, so_error); | |
75528772 | 508 | #ifdef LIBUNWIND_SO_7 |
6cb06a8c TT |
509 | gdb_printf (gdb_stderr, _("[GDB failed to load %s: %s]\n"), |
510 | LIBUNWIND_SO_7, dlerror ()); | |
75528772 | 511 | #endif /* LIBUNWIND_SO_7 */ |
47c1316c | 512 | } |
75528772 JK |
513 | xfree (so_error); |
514 | if (handle == NULL) | |
515 | return 0; | |
0e5d83e3 JJ |
516 | |
517 | /* Initialize pointers to the dynamic library functions we will use. */ | |
518 | ||
bfb0d950 | 519 | unw_get_reg_p = (unw_get_reg_p_ftype *) dlsym (handle, get_reg_name); |
0e5d83e3 JJ |
520 | if (unw_get_reg_p == NULL) |
521 | return 0; | |
522 | ||
bfb0d950 | 523 | unw_get_fpreg_p = (unw_get_fpreg_p_ftype *) dlsym (handle, get_fpreg_name); |
0e5d83e3 JJ |
524 | if (unw_get_fpreg_p == NULL) |
525 | return 0; | |
526 | ||
bfb0d950 AS |
527 | unw_get_saveloc_p |
528 | = (unw_get_saveloc_p_ftype *) dlsym (handle, get_saveloc_name); | |
0e5d83e3 JJ |
529 | if (unw_get_saveloc_p == NULL) |
530 | return 0; | |
531 | ||
bfb0d950 AS |
532 | unw_is_signal_frame_p |
533 | = (unw_is_signal_frame_p_ftype *) dlsym (handle, is_signal_frame_name); | |
c5a27d9c JJ |
534 | if (unw_is_signal_frame_p == NULL) |
535 | return 0; | |
536 | ||
bfb0d950 | 537 | unw_step_p = (unw_step_p_ftype *) dlsym (handle, step_name); |
0e5d83e3 JJ |
538 | if (unw_step_p == NULL) |
539 | return 0; | |
540 | ||
bfb0d950 AS |
541 | unw_init_remote_p |
542 | = (unw_init_remote_p_ftype *) dlsym (handle, init_remote_name); | |
0e5d83e3 JJ |
543 | if (unw_init_remote_p == NULL) |
544 | return 0; | |
545 | ||
bfb0d950 AS |
546 | unw_create_addr_space_p |
547 | = (unw_create_addr_space_p_ftype *) dlsym (handle, create_addr_space_name); | |
0e5d83e3 JJ |
548 | if (unw_create_addr_space_p == NULL) |
549 | return 0; | |
550 | ||
bfb0d950 AS |
551 | unw_destroy_addr_space_p |
552 | = (unw_destroy_addr_space_p_ftype *) dlsym (handle, | |
553 | destroy_addr_space_name); | |
f43ae3f1 AS |
554 | if (unw_destroy_addr_space_p == NULL) |
555 | return 0; | |
556 | ||
bfb0d950 AS |
557 | unw_search_unwind_table_p |
558 | = (unw_search_unwind_table_p_ftype *) dlsym (handle, | |
559 | search_unwind_table_name); | |
0e5d83e3 JJ |
560 | if (unw_search_unwind_table_p == NULL) |
561 | return 0; | |
562 | ||
bfb0d950 AS |
563 | unw_find_dyn_list_p |
564 | = (unw_find_dyn_list_p_ftype *) dlsym (handle, find_dyn_list_name); | |
0e5d83e3 JJ |
565 | if (unw_find_dyn_list_p == NULL) |
566 | return 0; | |
567 | ||
568 | return 1; | |
569 | } | |
570 | ||
571 | int | |
572 | libunwind_is_initialized (void) | |
573 | { | |
574 | return libunwind_initialized; | |
575 | } | |
576 | ||
6c265988 | 577 | void _initialize_libunwind_frame (); |
0e5d83e3 | 578 | void |
6c265988 | 579 | _initialize_libunwind_frame () |
0e5d83e3 | 580 | { |
0e5d83e3 JJ |
581 | libunwind_initialized = libunwind_load (); |
582 | } |