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05e7c244 | 1 | /* Frame unwinder for ia64 frames using the libunwind library. |
0e5d83e3 | 2 | |
4a94e368 | 3 | Copyright (C) 2003-2022 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 | 37 | |
268a13a5 | 38 | #include "gdbsupport/preprocessor.h" |
0e5d83e3 | 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 | 102 | |
38e400fa | 103 | #ifndef LIBUNWIND_SO |
70f575cc JK |
104 | /* Use the stable ABI major version number. `libunwind-ia64.so' is a link time |
105 | only library, not a runtime one. */ | |
75528772 JK |
106 | #define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.8" |
107 | ||
108 | /* Provide also compatibility with older .so. The two APIs are compatible, .8 | |
109 | is only extended a bit, GDB does not use the extended API at all. */ | |
110 | #define LIBUNWIND_SO_7 "libunwind-" STRINGIFY(UNW_TARGET) ".so.7" | |
38e400fa JJ |
111 | #endif |
112 | ||
e83f4d97 SM |
113 | static const char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg)); |
114 | static const char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg)); | |
115 | static const char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc)); | |
116 | static const char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame)); | |
117 | static const char *step_name = STRINGIFY(UNW_OBJ(step)); | |
118 | static const char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote)); | |
119 | static const char *create_addr_space_name | |
120 | = STRINGIFY(UNW_OBJ(create_addr_space)); | |
121 | static const char *destroy_addr_space_name | |
122 | = STRINGIFY(UNW_OBJ(destroy_addr_space)); | |
123 | static const char *search_unwind_table_name | |
3e43a32a | 124 | = STRINGIFY(UNW_OBJ(search_unwind_table)); |
e83f4d97 | 125 | static const char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list)); |
0e5d83e3 JJ |
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 * | |
3bc98c0c | 135 | libunwind_descr_init (struct obstack *obstack) |
0e5d83e3 | 136 | { |
3e43a32a | 137 | struct libunwind_descr *descr |
3bc98c0c | 138 | = OBSTACK_ZALLOC (obstack, 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)); | |
3bc98c0c | 153 | gdb_assert (arch_descr != NULL); |
0e5d83e3 JJ |
154 | |
155 | /* Copy new descriptor info into arch descriptor. */ | |
156 | arch_descr->gdb2uw = descr->gdb2uw; | |
157 | arch_descr->uw2gdb = descr->uw2gdb; | |
158 | arch_descr->is_fpreg = descr->is_fpreg; | |
159 | arch_descr->accessors = descr->accessors; | |
c5a27d9c | 160 | arch_descr->special_accessors = descr->special_accessors; |
0e5d83e3 JJ |
161 | } |
162 | ||
163 | static struct libunwind_frame_cache * | |
15c1e57f | 164 | libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
165 | { |
166 | unw_accessors_t *acc; | |
167 | unw_addr_space_t as; | |
168 | unw_word_t fp; | |
169 | unw_regnum_t uw_sp_regnum; | |
170 | struct libunwind_frame_cache *cache; | |
171 | struct libunwind_descr *descr; | |
15c1e57f | 172 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b4792091 | 173 | int ret; |
0e5d83e3 JJ |
174 | |
175 | if (*this_cache) | |
bfb0d950 | 176 | return (struct libunwind_frame_cache *) *this_cache; |
0e5d83e3 JJ |
177 | |
178 | /* Allocate a new cache. */ | |
179 | cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache); | |
180 | ||
15c1e57f | 181 | cache->func_addr = get_frame_func (this_frame); |
1b89e62f JB |
182 | if (cache->func_addr == 0) |
183 | /* This can happen when the frame corresponds to a function for which | |
184 | there is no debugging information nor any entry in the symbol table. | |
185 | This is probably a static function for which an entry in the symbol | |
186 | table was not created when the objfile got linked (observed in | |
187 | libpthread.so on ia64-hpux). | |
188 | ||
189 | The best we can do, in that case, is use the frame PC as the function | |
190 | address. We don't need to give up since we still have the unwind | |
191 | record to help us perform the unwinding. There is also another | |
85102364 | 192 | compelling to continue, because abandoning now means stopping |
1b89e62f JB |
193 | the backtrace, which can never be helpful for the user. */ |
194 | cache->func_addr = get_frame_pc (this_frame); | |
0e5d83e3 | 195 | |
15c1e57f JB |
196 | /* Get a libunwind cursor to the previous frame. |
197 | ||
198 | We do this by initializing a cursor. Libunwind treats a new cursor | |
199 | as the top of stack and will get the current register set via the | |
200 | libunwind register accessor. Now, we provide the platform-specific | |
201 | accessors and we set up the register accessor to use the frame | |
202 | register unwinding interfaces so that we properly get the registers | |
203 | for the current frame rather than the top. We then use the unw_step | |
204 | function to move the libunwind cursor back one frame. We can later | |
205 | use this cursor to find previous registers via the unw_get_reg | |
206 | interface which will invoke libunwind's special logic. */ | |
8cff2ae6 | 207 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 208 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 209 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 210 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 211 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
212 | ? __BIG_ENDIAN |
213 | : __LITTLE_ENDIAN); | |
214 | ||
15c1e57f | 215 | unw_init_remote_p (&cache->cursor, as, this_frame); |
c5a27d9c | 216 | if (unw_step_p (&cache->cursor) < 0) |
f43ae3f1 AS |
217 | { |
218 | unw_destroy_addr_space_p (as); | |
219 | return NULL; | |
220 | } | |
0e5d83e3 JJ |
221 | |
222 | /* To get base address, get sp from previous frame. */ | |
8cff2ae6 | 223 | uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch)); |
0e5d83e3 JJ |
224 | ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp); |
225 | if (ret < 0) | |
f43ae3f1 AS |
226 | { |
227 | unw_destroy_addr_space_p (as); | |
228 | error (_("Can't get libunwind sp register.")); | |
229 | } | |
0e5d83e3 JJ |
230 | |
231 | cache->base = (CORE_ADDR)fp; | |
272dfcfd | 232 | cache->as = as; |
0e5d83e3 JJ |
233 | |
234 | *this_cache = cache; | |
235 | return cache; | |
236 | } | |
237 | ||
272dfcfd AS |
238 | void |
239 | libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache) | |
240 | { | |
bfb0d950 AS |
241 | struct libunwind_frame_cache *cache |
242 | = (struct libunwind_frame_cache *) this_cache; | |
e0881a8e | 243 | |
272dfcfd AS |
244 | if (cache->as) |
245 | unw_destroy_addr_space_p (cache->as); | |
246 | } | |
247 | ||
503ff15d KB |
248 | unw_word_t |
249 | libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg) | |
0e5d83e3 | 250 | { |
503ff15d | 251 | return unw_find_dyn_list_p (as, di, arg); |
0e5d83e3 JJ |
252 | } |
253 | ||
0e5d83e3 JJ |
254 | /* Verify if there is sufficient libunwind information for the frame to use |
255 | libunwind frame unwinding. */ | |
15c1e57f JB |
256 | int |
257 | libunwind_frame_sniffer (const struct frame_unwind *self, | |
dda83cd7 | 258 | struct frame_info *this_frame, void **this_cache) |
0e5d83e3 JJ |
259 | { |
260 | unw_cursor_t cursor; | |
261 | unw_accessors_t *acc; | |
262 | unw_addr_space_t as; | |
263 | struct libunwind_descr *descr; | |
15c1e57f | 264 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b4792091 | 265 | int ret; |
0e5d83e3 | 266 | |
15c1e57f JB |
267 | /* To test for libunwind unwind support, initialize a cursor to |
268 | the current frame and try to back up. We use this same method | |
269 | when setting up the frame cache (see libunwind_frame_cache()). | |
270 | If libunwind returns success for this operation, it means that | |
271 | it has found sufficient libunwind unwinding information to do so. */ | |
0e5d83e3 | 272 | |
8cff2ae6 | 273 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 274 | acc = (unw_accessors_t *) descr->accessors; |
0e5d83e3 | 275 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 276 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 277 | == BFD_ENDIAN_BIG |
0e5d83e3 JJ |
278 | ? __BIG_ENDIAN |
279 | : __LITTLE_ENDIAN); | |
280 | ||
15c1e57f | 281 | ret = unw_init_remote_p (&cursor, as, this_frame); |
0e5d83e3 | 282 | |
c5a27d9c | 283 | if (ret < 0) |
f43ae3f1 AS |
284 | { |
285 | unw_destroy_addr_space_p (as); | |
15c1e57f | 286 | return 0; |
f43ae3f1 | 287 | } |
c5a27d9c JJ |
288 | |
289 | ||
290 | /* Check to see if we have libunwind info by checking if we are in a | |
291 | signal frame. If it doesn't return an error, we have libunwind info | |
292 | and can use libunwind. */ | |
293 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 294 | unw_destroy_addr_space_p (as); |
0e5d83e3 JJ |
295 | |
296 | if (ret < 0) | |
15c1e57f | 297 | return 0; |
0e5d83e3 | 298 | |
15c1e57f | 299 | return 1; |
0e5d83e3 JJ |
300 | } |
301 | ||
302 | void | |
15c1e57f | 303 | libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, |
dda83cd7 | 304 | struct frame_id *this_id) |
0e5d83e3 JJ |
305 | { |
306 | struct libunwind_frame_cache *cache = | |
15c1e57f | 307 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 308 | |
c5a27d9c JJ |
309 | if (cache != NULL) |
310 | (*this_id) = frame_id_build (cache->base, cache->func_addr); | |
0e5d83e3 JJ |
311 | } |
312 | ||
15c1e57f JB |
313 | struct value * |
314 | libunwind_frame_prev_register (struct frame_info *this_frame, | |
dda83cd7 | 315 | void **this_cache, int regnum) |
0e5d83e3 JJ |
316 | { |
317 | struct libunwind_frame_cache *cache = | |
15c1e57f | 318 | libunwind_frame_cache (this_frame, this_cache); |
0e5d83e3 | 319 | |
0e5d83e3 | 320 | unw_save_loc_t sl; |
b4792091 | 321 | int ret; |
0e5d83e3 JJ |
322 | unw_word_t intval; |
323 | unw_fpreg_t fpval; | |
324 | unw_regnum_t uw_regnum; | |
325 | struct libunwind_descr *descr; | |
15c1e57f | 326 | struct value *val = NULL; |
0e5d83e3 | 327 | |
c5a27d9c | 328 | if (cache == NULL) |
15c1e57f | 329 | return frame_unwind_got_constant (this_frame, regnum, 0); |
c5a27d9c | 330 | |
0e5d83e3 | 331 | /* Convert from gdb register number to libunwind register number. */ |
15c1e57f | 332 | descr = libunwind_descr (get_frame_arch (this_frame)); |
0e5d83e3 JJ |
333 | uw_regnum = descr->gdb2uw (regnum); |
334 | ||
335 | gdb_assert (regnum >= 0); | |
336 | ||
9dccd06e | 337 | if (!target_has_registers ()) |
8a3fe4f8 | 338 | error (_("No registers.")); |
0e5d83e3 | 339 | |
0e5d83e3 | 340 | if (uw_regnum < 0) |
15c1e57f | 341 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
342 | |
343 | if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) | |
15c1e57f | 344 | return frame_unwind_got_constant (this_frame, regnum, 0); |
0e5d83e3 JJ |
345 | |
346 | switch (sl.type) | |
347 | { | |
0e5d83e3 | 348 | case UNW_SLT_MEMORY: |
15c1e57f | 349 | val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); |
0e5d83e3 JJ |
350 | break; |
351 | ||
352 | case UNW_SLT_REG: | |
15c1e57f | 353 | val = frame_unwind_got_register (this_frame, regnum, |
dda83cd7 | 354 | descr->uw2gdb (sl.u.regnum)); |
0e5d83e3 | 355 | break; |
15c1e57f JB |
356 | case UNW_SLT_NONE: |
357 | { | |
dda83cd7 SM |
358 | /* The register is not stored at a specific memory address nor |
359 | inside another register. So use libunwind to fetch the register | |
360 | value for us, and create a constant value with the result. */ | |
361 | if (descr->is_fpreg (uw_regnum)) | |
362 | { | |
363 | ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); | |
364 | if (ret < 0) | |
365 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
366 | val = frame_unwind_got_bytes (this_frame, regnum, | |
367 | (gdb_byte *) &fpval); | |
368 | } | |
369 | else | |
370 | { | |
371 | ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); | |
372 | if (ret < 0) | |
373 | return frame_unwind_got_constant (this_frame, regnum, 0); | |
374 | val = frame_unwind_got_constant (this_frame, regnum, intval); | |
375 | } | |
376 | break; | |
15c1e57f | 377 | } |
0e5d83e3 | 378 | } |
15c1e57f JB |
379 | |
380 | return val; | |
0e5d83e3 JJ |
381 | } |
382 | ||
0e5d83e3 JJ |
383 | /* The following is a glue routine to call the libunwind unwind table |
384 | search function to get unwind information for a specified ip address. */ | |
385 | int | |
386 | libunwind_search_unwind_table (void *as, long ip, void *di, | |
387 | void *pi, int need_unwind_info, void *args) | |
388 | { | |
bfb0d950 AS |
389 | return unw_search_unwind_table_p (*(unw_addr_space_t *) as, (unw_word_t) ip, |
390 | (unw_dyn_info_t *) di, | |
391 | (unw_proc_info_t *) pi, need_unwind_info, | |
392 | args); | |
0e5d83e3 JJ |
393 | } |
394 | ||
c5a27d9c | 395 | /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ |
15c1e57f JB |
396 | int |
397 | libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
dda83cd7 SM |
398 | struct frame_info *this_frame, |
399 | void **this_cache) | |
c5a27d9c JJ |
400 | { |
401 | unw_cursor_t cursor; | |
402 | unw_accessors_t *acc; | |
403 | unw_addr_space_t as; | |
404 | struct libunwind_descr *descr; | |
15c1e57f | 405 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
b4792091 | 406 | int ret; |
c5a27d9c JJ |
407 | |
408 | /* To test for libunwind unwind support, initialize a cursor to the | |
409 | current frame and try to back up. We use this same method when | |
410 | setting up the frame cache (see libunwind_frame_cache()). If | |
411 | libunwind returns success for this operation, it means that it | |
412 | has found sufficient libunwind unwinding information to do | |
413 | so. */ | |
414 | ||
8cff2ae6 | 415 | descr = libunwind_descr (gdbarch); |
bfb0d950 | 416 | acc = (unw_accessors_t *) descr->accessors; |
c5a27d9c | 417 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 418 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 419 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
420 | ? __BIG_ENDIAN |
421 | : __LITTLE_ENDIAN); | |
422 | ||
15c1e57f | 423 | ret = unw_init_remote_p (&cursor, as, this_frame); |
c5a27d9c JJ |
424 | |
425 | if (ret < 0) | |
f43ae3f1 AS |
426 | { |
427 | unw_destroy_addr_space_p (as); | |
15c1e57f | 428 | return 0; |
f43ae3f1 | 429 | } |
c5a27d9c JJ |
430 | |
431 | /* Check to see if we are in a signal frame. */ | |
432 | ret = unw_is_signal_frame_p (&cursor); | |
f43ae3f1 | 433 | unw_destroy_addr_space_p (as); |
c5a27d9c | 434 | if (ret > 0) |
15c1e57f | 435 | return 1; |
c5a27d9c | 436 | |
15c1e57f | 437 | return 0; |
c5a27d9c JJ |
438 | } |
439 | ||
440 | /* The following routine is for accessing special registers of the top frame. | |
441 | A special set of accessors must be given that work without frame info. | |
442 | This is used by ia64 to access the rse registers r32-r127. While they | |
443 | are usually located at BOF, this is not always true and only the libunwind | |
444 | info can decipher where they actually are. */ | |
445 | int | |
933522d1 | 446 | libunwind_get_reg_special (struct gdbarch *gdbarch, readable_regcache *regcache, |
45ecac4b | 447 | int regnum, void *buf) |
c5a27d9c JJ |
448 | { |
449 | unw_cursor_t cursor; | |
450 | unw_accessors_t *acc; | |
451 | unw_addr_space_t as; | |
452 | struct libunwind_descr *descr; | |
453 | int ret; | |
454 | unw_regnum_t uw_regnum; | |
455 | unw_word_t intval; | |
456 | unw_fpreg_t fpval; | |
457 | void *ptr; | |
458 | ||
459 | ||
460 | descr = libunwind_descr (gdbarch); | |
bfb0d950 | 461 | acc = (unw_accessors_t *) descr->special_accessors; |
c5a27d9c | 462 | as = unw_create_addr_space_p (acc, |
8cff2ae6 | 463 | gdbarch_byte_order (gdbarch) |
4c6b5505 | 464 | == BFD_ENDIAN_BIG |
c5a27d9c JJ |
465 | ? __BIG_ENDIAN |
466 | : __LITTLE_ENDIAN); | |
467 | ||
45ecac4b | 468 | ret = unw_init_remote_p (&cursor, as, regcache); |
c5a27d9c | 469 | if (ret < 0) |
f43ae3f1 AS |
470 | { |
471 | unw_destroy_addr_space_p (as); | |
472 | return -1; | |
473 | } | |
c5a27d9c JJ |
474 | |
475 | uw_regnum = descr->gdb2uw (regnum); | |
476 | ||
477 | if (descr->is_fpreg (uw_regnum)) | |
478 | { | |
479 | ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval); | |
480 | ptr = &fpval; | |
481 | } | |
482 | else | |
483 | { | |
484 | ret = unw_get_reg_p (&cursor, uw_regnum, &intval); | |
485 | ptr = &intval; | |
486 | } | |
487 | ||
f43ae3f1 AS |
488 | unw_destroy_addr_space_p (as); |
489 | ||
c5a27d9c JJ |
490 | if (ret < 0) |
491 | return -1; | |
492 | ||
493 | if (buf) | |
8cff2ae6 | 494 | memcpy (buf, ptr, register_size (gdbarch, regnum)); |
c5a27d9c JJ |
495 | |
496 | return 0; | |
497 | } | |
498 | ||
0e5d83e3 JJ |
499 | static int |
500 | libunwind_load (void) | |
501 | { | |
502 | void *handle; | |
75528772 | 503 | char *so_error = NULL; |
0e5d83e3 JJ |
504 | |
505 | handle = dlopen (LIBUNWIND_SO, RTLD_NOW); | |
75528772 JK |
506 | if (handle == NULL) |
507 | { | |
508 | so_error = xstrdup (dlerror ()); | |
509 | #ifdef LIBUNWIND_SO_7 | |
510 | handle = dlopen (LIBUNWIND_SO_7, RTLD_NOW); | |
511 | #endif /* LIBUNWIND_SO_7 */ | |
512 | } | |
0e5d83e3 | 513 | if (handle == NULL) |
47c1316c | 514 | { |
6cb06a8c TT |
515 | gdb_printf (gdb_stderr, _("[GDB failed to load %s: %s]\n"), |
516 | LIBUNWIND_SO, so_error); | |
75528772 | 517 | #ifdef LIBUNWIND_SO_7 |
6cb06a8c TT |
518 | gdb_printf (gdb_stderr, _("[GDB failed to load %s: %s]\n"), |
519 | LIBUNWIND_SO_7, dlerror ()); | |
75528772 | 520 | #endif /* LIBUNWIND_SO_7 */ |
47c1316c | 521 | } |
75528772 JK |
522 | xfree (so_error); |
523 | if (handle == NULL) | |
524 | return 0; | |
0e5d83e3 JJ |
525 | |
526 | /* Initialize pointers to the dynamic library functions we will use. */ | |
527 | ||
bfb0d950 | 528 | unw_get_reg_p = (unw_get_reg_p_ftype *) dlsym (handle, get_reg_name); |
0e5d83e3 JJ |
529 | if (unw_get_reg_p == NULL) |
530 | return 0; | |
531 | ||
bfb0d950 | 532 | unw_get_fpreg_p = (unw_get_fpreg_p_ftype *) dlsym (handle, get_fpreg_name); |
0e5d83e3 JJ |
533 | if (unw_get_fpreg_p == NULL) |
534 | return 0; | |
535 | ||
bfb0d950 AS |
536 | unw_get_saveloc_p |
537 | = (unw_get_saveloc_p_ftype *) dlsym (handle, get_saveloc_name); | |
0e5d83e3 JJ |
538 | if (unw_get_saveloc_p == NULL) |
539 | return 0; | |
540 | ||
bfb0d950 AS |
541 | unw_is_signal_frame_p |
542 | = (unw_is_signal_frame_p_ftype *) dlsym (handle, is_signal_frame_name); | |
c5a27d9c JJ |
543 | if (unw_is_signal_frame_p == NULL) |
544 | return 0; | |
545 | ||
bfb0d950 | 546 | unw_step_p = (unw_step_p_ftype *) dlsym (handle, step_name); |
0e5d83e3 JJ |
547 | if (unw_step_p == NULL) |
548 | return 0; | |
549 | ||
bfb0d950 AS |
550 | unw_init_remote_p |
551 | = (unw_init_remote_p_ftype *) dlsym (handle, init_remote_name); | |
0e5d83e3 JJ |
552 | if (unw_init_remote_p == NULL) |
553 | return 0; | |
554 | ||
bfb0d950 AS |
555 | unw_create_addr_space_p |
556 | = (unw_create_addr_space_p_ftype *) dlsym (handle, create_addr_space_name); | |
0e5d83e3 JJ |
557 | if (unw_create_addr_space_p == NULL) |
558 | return 0; | |
559 | ||
bfb0d950 AS |
560 | unw_destroy_addr_space_p |
561 | = (unw_destroy_addr_space_p_ftype *) dlsym (handle, | |
562 | destroy_addr_space_name); | |
f43ae3f1 AS |
563 | if (unw_destroy_addr_space_p == NULL) |
564 | return 0; | |
565 | ||
bfb0d950 AS |
566 | unw_search_unwind_table_p |
567 | = (unw_search_unwind_table_p_ftype *) dlsym (handle, | |
568 | search_unwind_table_name); | |
0e5d83e3 JJ |
569 | if (unw_search_unwind_table_p == NULL) |
570 | return 0; | |
571 | ||
bfb0d950 AS |
572 | unw_find_dyn_list_p |
573 | = (unw_find_dyn_list_p_ftype *) dlsym (handle, find_dyn_list_name); | |
0e5d83e3 JJ |
574 | if (unw_find_dyn_list_p == NULL) |
575 | return 0; | |
576 | ||
577 | return 1; | |
578 | } | |
579 | ||
580 | int | |
581 | libunwind_is_initialized (void) | |
582 | { | |
583 | return libunwind_initialized; | |
584 | } | |
585 | ||
6c265988 | 586 | void _initialize_libunwind_frame (); |
0e5d83e3 | 587 | void |
6c265988 | 588 | _initialize_libunwind_frame () |
0e5d83e3 | 589 | { |
3e43a32a | 590 | libunwind_descr_handle |
3bc98c0c | 591 | = gdbarch_data_register_pre_init (libunwind_descr_init); |
0e5d83e3 JJ |
592 | |
593 | libunwind_initialized = libunwind_load (); | |
594 | } |