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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
32d0add0 | 3 | Copyright (C) 1999-2015 Free Software Foundation, Inc. |
fb0e1ba7 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
fb0e1ba7 MK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
fb0e1ba7 MK |
19 | |
20 | #include "defs.h" | |
fb0e1ba7 MK |
21 | #include <dlfcn.h> |
22 | #include "gdb_proc_service.h" | |
125f8a3d | 23 | #include "nat/gdb_thread_db.h" |
e6712ff1 | 24 | #include "gdb_vecs.h" |
bda9cb72 | 25 | #include "bfd.h" |
17a37d48 | 26 | #include "command.h" |
17a37d48 | 27 | #include "gdbcmd.h" |
fb0e1ba7 MK |
28 | #include "gdbthread.h" |
29 | #include "inferior.h" | |
45741a9c | 30 | #include "infrun.h" |
bda9cb72 MK |
31 | #include "symfile.h" |
32 | #include "objfiles.h" | |
fb0e1ba7 | 33 | #include "target.h" |
4e052eda | 34 | #include "regcache.h" |
17a37d48 | 35 | #include "solib.h" |
3f47be5c | 36 | #include "solib-svr4.h" |
16451949 | 37 | #include "gdbcore.h" |
06d3b283 | 38 | #include "observer.h" |
0ec9a092 | 39 | #include "linux-nat.h" |
125f8a3d | 40 | #include "nat/linux-procfs.h" |
c1a747c1 | 41 | #include "nat/linux-ptrace.h" |
125f8a3d | 42 | #include "nat/linux-osdata.h" |
bf88dd68 | 43 | #include "auto-load.h" |
529480d0 | 44 | #include "cli/cli-utils.h" |
979894f2 | 45 | #include <signal.h> |
bf88dd68 | 46 | #include <ctype.h> |
9bc3a976 | 47 | #include "nat/linux-namespaces.h" |
979894f2 | 48 | |
17faa917 DJ |
49 | /* GNU/Linux libthread_db support. |
50 | ||
51 | libthread_db is a library, provided along with libpthread.so, which | |
52 | exposes the internals of the thread library to a debugger. It | |
53 | allows GDB to find existing threads, new threads as they are | |
54 | created, thread IDs (usually, the result of pthread_self), and | |
55 | thread-local variables. | |
56 | ||
57 | The libthread_db interface originates on Solaris, where it is | |
58 | both more powerful and more complicated. This implementation | |
59 | only works for LinuxThreads and NPTL, the two glibc threading | |
60 | libraries. It assumes that each thread is permanently assigned | |
61 | to a single light-weight process (LWP). | |
62 | ||
63 | libthread_db-specific information is stored in the "private" field | |
64 | of struct thread_info. When the field is NULL we do not yet have | |
65 | information about the new thread; this could be temporary (created, | |
66 | but the thread library's data structures do not reflect it yet) | |
67 | or permanent (created using clone instead of pthread_create). | |
68 | ||
69 | Process IDs managed by linux-thread-db.c match those used by | |
70 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
71 | thread, and no TID. We save the TID in private. Keeping it out | |
72 | of the ptid_t prevents thread IDs changing when libpthread is | |
73 | loaded or unloaded. */ | |
74 | ||
17a37d48 PP |
75 | static char *libthread_db_search_path; |
76 | ||
bf88dd68 JK |
77 | /* Set to non-zero if thread_db auto-loading is enabled |
78 | by the "set auto-load libthread-db" command. */ | |
79 | static int auto_load_thread_db = 1; | |
80 | ||
81 | /* "show" command for the auto_load_thread_db configuration variable. */ | |
82 | ||
83 | static void | |
84 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
85 | struct cmd_list_element *c, const char *value) | |
86 | { | |
87 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
88 | "is %s.\n"), | |
89 | value); | |
90 | } | |
91 | ||
84e578fb DE |
92 | static void |
93 | set_libthread_db_search_path (char *ignored, int from_tty, | |
94 | struct cmd_list_element *c) | |
95 | { | |
96 | if (*libthread_db_search_path == '\0') | |
97 | { | |
98 | xfree (libthread_db_search_path); | |
99 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
100 | } | |
101 | } | |
102 | ||
02d868e8 PP |
103 | /* If non-zero, print details of libthread_db processing. */ |
104 | ||
ccce17b0 | 105 | static unsigned int libthread_db_debug; |
02d868e8 PP |
106 | |
107 | static void | |
108 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
109 | struct cmd_list_element *c, const char *value) | |
110 | { | |
111 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
112 | } | |
113 | ||
8605d56e AC |
114 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
115 | threads. */ | |
fb0e1ba7 | 116 | |
fb0e1ba7 MK |
117 | /* This module's target vector. */ |
118 | static struct target_ops thread_db_ops; | |
119 | ||
fb0e1ba7 MK |
120 | /* Non-zero if we have determined the signals used by the threads |
121 | library. */ | |
122 | static int thread_signals; | |
123 | static sigset_t thread_stop_set; | |
124 | static sigset_t thread_print_set; | |
125 | ||
d90e17a7 PA |
126 | struct thread_db_info |
127 | { | |
128 | struct thread_db_info *next; | |
129 | ||
130 | /* Process id this object refers to. */ | |
131 | int pid; | |
132 | ||
133 | /* Handle from dlopen for libthread_db.so. */ | |
134 | void *handle; | |
135 | ||
bf88dd68 JK |
136 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
137 | HANDLE. It may be NULL for system library. */ | |
138 | char *filename; | |
139 | ||
d90e17a7 PA |
140 | /* Structure that identifies the child process for the |
141 | <proc_service.h> interface. */ | |
142 | struct ps_prochandle proc_handle; | |
143 | ||
144 | /* Connection to the libthread_db library. */ | |
145 | td_thragent_t *thread_agent; | |
146 | ||
4d062f1a PA |
147 | /* True if we need to apply the workaround for glibc/BZ5983. When |
148 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
149 | list, nptl_db returns the parent's threads in addition to the new | |
150 | (single) child thread. If this flag is set, we do extra work to | |
151 | be able to ignore such stale entries. */ | |
152 | int need_stale_parent_threads_check; | |
153 | ||
d90e17a7 | 154 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 155 | |
96e9210f PA |
156 | td_init_ftype *td_init_p; |
157 | td_ta_new_ftype *td_ta_new_p; | |
158 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; | |
159 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f PA |
160 | td_thr_validate_ftype *td_thr_validate_p; |
161 | td_thr_get_info_ftype *td_thr_get_info_p; | |
96e9210f PA |
162 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
163 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
164 | }; |
165 | ||
166 | /* List of known processes using thread_db, and the required | |
167 | bookkeeping. */ | |
168 | struct thread_db_info *thread_db_list; | |
169 | ||
170 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 171 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 | 172 | |
2db9a427 PA |
173 | static void check_thread_signals (void); |
174 | ||
be550b6e DE |
175 | static struct thread_info *record_thread |
176 | (struct thread_db_info *info, struct thread_info *tp, | |
177 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 178 | |
d90e17a7 PA |
179 | /* Add the current inferior to the list of processes using libpthread. |
180 | Return a pointer to the newly allocated object that was added to | |
181 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
182 | LIBTHREAD_DB_SO. */ | |
183 | ||
184 | static struct thread_db_info * | |
185 | add_thread_db_info (void *handle) | |
186 | { | |
8d749320 | 187 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 188 | |
d90e17a7 PA |
189 | info->pid = ptid_get_pid (inferior_ptid); |
190 | info->handle = handle; | |
856d6f99 PA |
191 | |
192 | /* The workaround works by reading from /proc/pid/status, so it is | |
193 | disabled for core files. */ | |
194 | if (target_has_execution) | |
195 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
196 | |
197 | info->next = thread_db_list; | |
198 | thread_db_list = info; | |
199 | ||
200 | return info; | |
201 | } | |
202 | ||
203 | /* Return the thread_db_info object representing the bookkeeping | |
204 | related to process PID, if any; NULL otherwise. */ | |
205 | ||
206 | static struct thread_db_info * | |
207 | get_thread_db_info (int pid) | |
208 | { | |
209 | struct thread_db_info *info; | |
210 | ||
211 | for (info = thread_db_list; info; info = info->next) | |
212 | if (pid == info->pid) | |
213 | return info; | |
214 | ||
215 | return NULL; | |
216 | } | |
217 | ||
218 | /* When PID has exited or has been detached, we no longer want to keep | |
219 | track of it as using libpthread. Call this function to discard | |
220 | thread_db related info related to PID. Note that this closes | |
221 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
222 | ||
223 | static void | |
224 | delete_thread_db_info (int pid) | |
225 | { | |
226 | struct thread_db_info *info, *info_prev; | |
227 | ||
228 | info_prev = NULL; | |
229 | ||
230 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
231 | if (pid == info->pid) | |
232 | break; | |
233 | ||
234 | if (info == NULL) | |
235 | return; | |
236 | ||
237 | if (info->handle != NULL) | |
238 | dlclose (info->handle); | |
239 | ||
bf88dd68 JK |
240 | xfree (info->filename); |
241 | ||
d90e17a7 PA |
242 | if (info_prev) |
243 | info_prev->next = info->next; | |
244 | else | |
245 | thread_db_list = info->next; | |
246 | ||
247 | xfree (info); | |
248 | } | |
fb0e1ba7 | 249 | |
5365276c DJ |
250 | /* Use "struct private_thread_info" to cache thread state. This is |
251 | a substantial optimization. */ | |
252 | ||
fb0e1ba7 MK |
253 | struct private_thread_info |
254 | { | |
a2f23071 DJ |
255 | /* Flag set when we see a TD_DEATH event for this thread. */ |
256 | unsigned int dying:1; | |
257 | ||
5365276c | 258 | /* Cached thread state. */ |
5365276c | 259 | td_thrhandle_t th; |
17faa917 | 260 | thread_t tid; |
fb0e1ba7 | 261 | }; |
fb0e1ba7 | 262 | \f |
21bf60fe | 263 | |
fb0e1ba7 MK |
264 | static char * |
265 | thread_db_err_str (td_err_e err) | |
266 | { | |
267 | static char buf[64]; | |
268 | ||
269 | switch (err) | |
270 | { | |
271 | case TD_OK: | |
272 | return "generic 'call succeeded'"; | |
273 | case TD_ERR: | |
274 | return "generic error"; | |
275 | case TD_NOTHR: | |
276 | return "no thread to satisfy query"; | |
277 | case TD_NOSV: | |
278 | return "no sync handle to satisfy query"; | |
279 | case TD_NOLWP: | |
280 | return "no LWP to satisfy query"; | |
281 | case TD_BADPH: | |
282 | return "invalid process handle"; | |
283 | case TD_BADTH: | |
284 | return "invalid thread handle"; | |
285 | case TD_BADSH: | |
286 | return "invalid synchronization handle"; | |
287 | case TD_BADTA: | |
288 | return "invalid thread agent"; | |
289 | case TD_BADKEY: | |
290 | return "invalid key"; | |
291 | case TD_NOMSG: | |
292 | return "no event message for getmsg"; | |
293 | case TD_NOFPREGS: | |
294 | return "FPU register set not available"; | |
295 | case TD_NOLIBTHREAD: | |
296 | return "application not linked with libthread"; | |
297 | case TD_NOEVENT: | |
298 | return "requested event is not supported"; | |
299 | case TD_NOCAPAB: | |
300 | return "capability not available"; | |
301 | case TD_DBERR: | |
302 | return "debugger service failed"; | |
303 | case TD_NOAPLIC: | |
304 | return "operation not applicable to"; | |
305 | case TD_NOTSD: | |
306 | return "no thread-specific data for this thread"; | |
307 | case TD_MALLOC: | |
308 | return "malloc failed"; | |
309 | case TD_PARTIALREG: | |
310 | return "only part of register set was written/read"; | |
311 | case TD_NOXREGS: | |
312 | return "X register set not available for this thread"; | |
59f80f10 DJ |
313 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
314 | case TD_NOTALLOC: | |
315 | return "thread has not yet allocated TLS for given module"; | |
316 | #endif | |
317 | #ifdef THREAD_DB_HAS_TD_VERSION | |
318 | case TD_VERSION: | |
319 | return "versions of libpthread and libthread_db do not match"; | |
320 | #endif | |
321 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
322 | case TD_NOTLS: | |
323 | return "there is no TLS segment in the given module"; | |
324 | #endif | |
fb0e1ba7 MK |
325 | default: |
326 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
327 | return buf; | |
328 | } | |
329 | } | |
4105de34 | 330 | |
64776a0b | 331 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 332 | |
be550b6e | 333 | static struct thread_info * |
39f77062 | 334 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 335 | { |
fb0e1ba7 | 336 | td_thrhandle_t th; |
2db9a427 | 337 | td_thrinfo_t ti; |
fb0e1ba7 | 338 | td_err_e err; |
d90e17a7 | 339 | struct thread_db_info *info; |
2db9a427 | 340 | struct thread_info *tp; |
fb0e1ba7 | 341 | |
6cb9b55b PP |
342 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
343 | th.th_unique = 0; | |
344 | ||
17faa917 DJ |
345 | /* This ptid comes from linux-nat.c, which should always fill in the |
346 | LWP. */ | |
dfd4cc63 | 347 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 348 | |
dfd4cc63 | 349 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 350 | |
4c28f408 | 351 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 352 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
353 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
354 | &th); | |
fb0e1ba7 | 355 | if (err != TD_OK) |
8a3fe4f8 | 356 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 357 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 358 | |
2db9a427 PA |
359 | err = info->td_thr_get_info_p (&th, &ti); |
360 | if (err != TD_OK) | |
361 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
362 | thread_db_err_str (err)); | |
363 | ||
364 | /* Fill the cache. */ | |
365 | tp = find_thread_ptid (ptid); | |
be550b6e | 366 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
367 | } |
368 | \f | |
369 | ||
2db9a427 PA |
370 | /* See linux-nat.h. */ |
371 | ||
4c28f408 | 372 | int |
2db9a427 | 373 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 PA |
374 | { |
375 | td_thrhandle_t th; | |
376 | td_thrinfo_t ti; | |
377 | td_err_e err; | |
d90e17a7 | 378 | struct thread_db_info *info; |
4c28f408 | 379 | |
2db9a427 | 380 | info = get_thread_db_info (ptid_get_pid (child)); |
d90e17a7 PA |
381 | |
382 | if (info == NULL) | |
4c28f408 PA |
383 | return 0; |
384 | ||
2db9a427 | 385 | thread_from_lwp (child); |
4c28f408 | 386 | |
2db9a427 PA |
387 | /* If we do not know about the main thread yet, this would be a good |
388 | time to find it. */ | |
389 | thread_from_lwp (parent); | |
4c28f408 PA |
390 | return 1; |
391 | } | |
392 | ||
5220ea4c AC |
393 | static void * |
394 | verbose_dlsym (void *handle, const char *name) | |
395 | { | |
396 | void *sym = dlsym (handle, name); | |
397 | if (sym == NULL) | |
3e43a32a MS |
398 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
399 | name, dlerror ()); | |
5220ea4c AC |
400 | return sym; |
401 | } | |
402 | ||
fcb44371 JK |
403 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
404 | return 1 if this version is lower (and not equal) to | |
405 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
406 | ||
407 | static int | |
408 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
409 | { | |
3b7344d5 | 410 | struct bound_minimal_symbol version_msym; |
fcb44371 JK |
411 | CORE_ADDR version_addr; |
412 | char *version; | |
413 | int err, got, retval = 0; | |
414 | ||
415 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 416 | if (version_msym.minsym == NULL) |
fcb44371 JK |
417 | return 0; |
418 | ||
77e371c0 | 419 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 JK |
420 | got = target_read_string (version_addr, &version, 32, &err); |
421 | if (err == 0 && memchr (version, 0, got) == &version[got -1]) | |
422 | { | |
423 | int major, minor; | |
424 | ||
425 | retval = (sscanf (version, "%d.%d", &major, &minor) == 2 | |
426 | && (major < ver_major_min | |
427 | || (major == ver_major_min && minor < ver_minor_min))); | |
428 | } | |
429 | xfree (version); | |
430 | ||
431 | return retval; | |
432 | } | |
433 | ||
fcb44371 JK |
434 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
435 | if appropriate. | |
456b0e24 | 436 | |
fcb44371 JK |
437 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
438 | otherwise. */ | |
439 | ||
440 | static int | |
456b0e24 PP |
441 | thread_db_find_new_threads_silently (ptid_t ptid) |
442 | { | |
456b0e24 | 443 | |
492d29ea | 444 | TRY |
456b0e24 | 445 | { |
02c6c942 | 446 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
447 | } |
448 | ||
492d29ea | 449 | CATCH (except, RETURN_MASK_ERROR) |
e0881a8e | 450 | { |
fcb44371 | 451 | if (libthread_db_debug) |
883ed13e | 452 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
453 | "Warning: thread_db_find_new_threads_silently: "); |
454 | ||
455 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
456 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
457 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
458 | executables if td_thr_get_info is called before glibc has initialized | |
459 | itself. | |
460 | ||
461 | If the nptl bug is NOT present in the inferior and still thread_db | |
462 | reports an error return 1. It means the inferior has corrupted thread | |
463 | list and GDB should fall back only to LWPs. | |
464 | ||
465 | If the nptl bug is present in the inferior return 0 to silently ignore | |
466 | such errors, and let gdb enumerate threads again later. In such case | |
467 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
468 | corrupted. For core files it does not apply, no 'later enumeration' |
469 | is possible. */ | |
fcb44371 | 470 | |
889003ed | 471 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
472 | { |
473 | exception_fprintf (gdb_stderr, except, | |
474 | _("Warning: couldn't activate thread debugging " | |
475 | "using libthread_db: ")); | |
476 | return 1; | |
477 | } | |
e0881a8e | 478 | } |
492d29ea PA |
479 | END_CATCH |
480 | ||
fcb44371 | 481 | return 0; |
456b0e24 PP |
482 | } |
483 | ||
d90e17a7 PA |
484 | /* Lookup a library in which given symbol resides. |
485 | Note: this is looking in GDB process, not in the inferior. | |
486 | Returns library name, or NULL. */ | |
487 | ||
488 | static const char * | |
489 | dladdr_to_soname (const void *addr) | |
490 | { | |
491 | Dl_info info; | |
492 | ||
493 | if (dladdr (addr, &info) != 0) | |
494 | return info.dli_fname; | |
495 | return NULL; | |
496 | } | |
497 | ||
2471d008 | 498 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
499 | Return 1 on success. |
500 | Failure could happen if libthread_db does not have symbols we expect, | |
501 | or when it refuses to work with the current inferior (e.g. due to | |
502 | version mismatch between libthread_db and libpthread). */ | |
503 | ||
504 | static int | |
d90e17a7 | 505 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
506 | { |
507 | td_err_e err; | |
508 | ||
509 | /* Initialize pointers to the dynamic library functions we will use. | |
510 | Essential functions first. */ | |
511 | ||
96e9210f PA |
512 | #define TDB_VERBOSE_DLSYM(info, func) \ |
513 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
514 | ||
515 | #define TDB_DLSYM(info, func) \ | |
516 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
517 | ||
518 | #define CHK(a) \ | |
519 | do \ | |
520 | { \ | |
521 | if ((a) == NULL) \ | |
522 | return 0; \ | |
523 | } while (0) | |
524 | ||
525 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 526 | |
d90e17a7 | 527 | err = info->td_init_p (); |
17a37d48 PP |
528 | if (err != TD_OK) |
529 | { | |
3e43a32a MS |
530 | warning (_("Cannot initialize libthread_db: %s"), |
531 | thread_db_err_str (err)); | |
17a37d48 PP |
532 | return 0; |
533 | } | |
534 | ||
96e9210f | 535 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
536 | |
537 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 538 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
539 | |
540 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 541 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
542 | if (err != TD_OK) |
543 | { | |
02d868e8 | 544 | if (libthread_db_debug) |
883ed13e PA |
545 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
546 | thread_db_err_str (err)); | |
17a37d48 PP |
547 | else |
548 | switch (err) | |
549 | { | |
550 | case TD_NOLIBTHREAD: | |
551 | #ifdef THREAD_DB_HAS_TD_VERSION | |
552 | case TD_VERSION: | |
553 | #endif | |
554 | /* The errors above are not unexpected and silently ignored: | |
555 | they just mean we haven't found correct version of | |
556 | libthread_db yet. */ | |
557 | break; | |
558 | default: | |
559 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
560 | } | |
561 | return 0; | |
562 | } | |
563 | ||
96e9210f PA |
564 | /* These are essential. */ |
565 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
566 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
567 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_validate)); | |
568 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); | |
17a37d48 PP |
569 | |
570 | /* These are not essential. */ | |
96e9210f PA |
571 | TDB_DLSYM (info, td_thr_tls_get_addr); |
572 | TDB_DLSYM (info, td_thr_tlsbase); | |
573 | ||
574 | #undef TDB_VERBOSE_DLSYM | |
575 | #undef TDB_DLSYM | |
576 | #undef CHK | |
17a37d48 | 577 | |
2db9a427 PA |
578 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
579 | structures in the inferior's address space that may be corrupted, | |
580 | or, if the target is running, may change while we walk them. If | |
581 | there's execution (and /proc is mounted), then we're already | |
582 | attached to all LWPs. Use thread_from_lwp, which uses | |
583 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
584 | ||
585 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
586 | currently on core targets, as it uses ptrace directly. */ | |
587 | if (target_has_execution | |
588 | && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid))) | |
589 | { | |
590 | struct lwp_info *lp; | |
591 | int pid = ptid_get_pid (inferior_ptid); | |
592 | ||
593 | linux_stop_and_wait_all_lwps (); | |
594 | ||
595 | ALL_LWPS (lp) | |
596 | if (ptid_get_pid (lp->ptid) == pid) | |
597 | thread_from_lwp (lp->ptid); | |
598 | ||
599 | linux_unstop_all_lwps (); | |
600 | } | |
601 | else if (thread_db_find_new_threads_silently (inferior_ptid) != 0) | |
fcb44371 JK |
602 | { |
603 | /* Even if libthread_db initializes, if the thread list is | |
604 | corrupted, we'd not manage to list any threads. Better reject this | |
605 | thread_db, and fall back to at least listing LWPs. */ | |
606 | return 0; | |
607 | } | |
608 | ||
17a37d48 PP |
609 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
610 | ||
883ed13e | 611 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 612 | { |
883ed13e | 613 | struct ui_file *file; |
d90e17a7 | 614 | const char *library; |
17a37d48 | 615 | |
f8708a14 | 616 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
617 | if (library == NULL) |
618 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 619 | |
883ed13e PA |
620 | /* If we'd print this to gdb_stdout when debug output is |
621 | disabled, still print it to gdb_stdout if debug output is | |
622 | enabled. User visible output should not depend on debug | |
623 | settings. */ | |
624 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
625 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
626 | library); | |
d90e17a7 | 627 | } |
17a37d48 | 628 | |
d90e17a7 PA |
629 | /* The thread library was detected. Activate the thread_db target |
630 | if this is the first process using it. */ | |
631 | if (thread_db_list->next == NULL) | |
632 | push_target (&thread_db_ops); | |
17a37d48 | 633 | |
d90e17a7 | 634 | return 1; |
17a37d48 PP |
635 | } |
636 | ||
637 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
638 | relative, or just LIBTHREAD_DB. */ | |
639 | ||
640 | static int | |
fde4f8ed | 641 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
642 | { |
643 | void *handle; | |
d90e17a7 | 644 | struct thread_db_info *info; |
17a37d48 | 645 | |
02d868e8 | 646 | if (libthread_db_debug) |
883ed13e PA |
647 | fprintf_unfiltered (gdb_stdlog, |
648 | _("Trying host libthread_db library: %s.\n"), | |
649 | library); | |
fde4f8ed JK |
650 | |
651 | if (check_auto_load_safe) | |
652 | { | |
653 | if (access (library, R_OK) != 0) | |
654 | { | |
655 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
656 | not exist at this place. */ | |
657 | if (libthread_db_debug) | |
883ed13e PA |
658 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
659 | safe_strerror (errno)); | |
fde4f8ed JK |
660 | return 0; |
661 | } | |
662 | ||
663 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
664 | "library \"%s\" from explicit " | |
665 | "directory.\n"), | |
666 | library)) | |
667 | return 0; | |
668 | } | |
669 | ||
17a37d48 PP |
670 | handle = dlopen (library, RTLD_NOW); |
671 | if (handle == NULL) | |
672 | { | |
02d868e8 | 673 | if (libthread_db_debug) |
883ed13e | 674 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
675 | return 0; |
676 | } | |
677 | ||
02d868e8 | 678 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
679 | { |
680 | void *td_init; | |
681 | ||
682 | td_init = dlsym (handle, "td_init"); | |
683 | if (td_init != NULL) | |
684 | { | |
685 | const char *const libpath = dladdr_to_soname (td_init); | |
686 | ||
687 | if (libpath != NULL) | |
883ed13e | 688 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
689 | library, libpath); |
690 | } | |
691 | } | |
692 | ||
d90e17a7 PA |
693 | info = add_thread_db_info (handle); |
694 | ||
bf88dd68 JK |
695 | /* Do not save system library name, that one is always trusted. */ |
696 | if (strchr (library, '/') != NULL) | |
697 | info->filename = gdb_realpath (library); | |
698 | ||
d90e17a7 | 699 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
700 | return 1; |
701 | ||
702 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 703 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
704 | return 0; |
705 | } | |
706 | ||
290351b8 | 707 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
708 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
709 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
710 | The result is true for success. */ |
711 | ||
712 | static int | |
e6712ff1 | 713 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 714 | { |
05386e9e TT |
715 | struct cleanup *cleanup; |
716 | char *path, *cp; | |
717 | int result; | |
4262abfb | 718 | const char *obj_name = objfile_name (obj); |
224c3ddb | 719 | int alloc_len; |
290351b8 | 720 | |
4262abfb | 721 | if (obj_name[0] != '/') |
290351b8 DE |
722 | { |
723 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 724 | " inferior, but got %s."), obj_name); |
290351b8 DE |
725 | return 0; |
726 | } | |
05386e9e | 727 | |
224c3ddb SM |
728 | alloc_len = (strlen (obj_name) |
729 | + (subdir ? strlen (subdir) + 1 : 0) | |
730 | + 1 + strlen (LIBTHREAD_DB_SO) + 1); | |
731 | path = (char *) xmalloc (alloc_len); | |
05386e9e TT |
732 | cleanup = make_cleanup (xfree, path); |
733 | ||
4262abfb | 734 | strcpy (path, obj_name); |
05386e9e TT |
735 | cp = strrchr (path, '/'); |
736 | /* This should at minimum hit the first character. */ | |
737 | gdb_assert (cp != NULL); | |
e6712ff1 DE |
738 | cp[1] = '\0'; |
739 | if (subdir != NULL) | |
740 | { | |
741 | strcat (cp, subdir); | |
742 | strcat (cp, "/"); | |
743 | } | |
744 | strcat (cp, LIBTHREAD_DB_SO); | |
bccbefd2 | 745 | |
fde4f8ed | 746 | result = try_thread_db_load (path, 1); |
05386e9e TT |
747 | |
748 | do_cleanups (cleanup); | |
749 | return result; | |
290351b8 DE |
750 | } |
751 | ||
98a5dd13 | 752 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
753 | Look for libthread_db in directory(libpthread)/SUBDIR. |
754 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
755 | The result is true for success. */ |
756 | ||
757 | static int | |
e6712ff1 | 758 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
759 | { |
760 | struct objfile *obj; | |
761 | ||
bf88dd68 JK |
762 | if (!auto_load_thread_db) |
763 | return 0; | |
764 | ||
98a5dd13 | 765 | ALL_OBJFILES (obj) |
4262abfb | 766 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 767 | { |
e6712ff1 | 768 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
769 | return 1; |
770 | ||
771 | /* We may have found the separate-debug-info version of | |
772 | libpthread, and it may live in a directory without a matching | |
773 | libthread_db. */ | |
774 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
775 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
776 | subdir); | |
290351b8 | 777 | |
98a5dd13 DE |
778 | return 0; |
779 | } | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | /* Handle $sdir in libthread-db-search-path. | |
785 | Look for libthread_db in the system dirs, or wherever a plain | |
786 | dlopen(file_without_path) will look. | |
787 | The result is true for success. */ | |
788 | ||
789 | static int | |
790 | try_thread_db_load_from_sdir (void) | |
791 | { | |
fde4f8ed | 792 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
793 | } |
794 | ||
795 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
796 | The result is true for success. */ | |
797 | ||
798 | static int | |
799 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
800 | { | |
05386e9e TT |
801 | struct cleanup *cleanup; |
802 | char *path; | |
803 | int result; | |
98a5dd13 | 804 | |
bf88dd68 JK |
805 | if (!auto_load_thread_db) |
806 | return 0; | |
807 | ||
224c3ddb | 808 | path = (char *) xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
05386e9e | 809 | cleanup = make_cleanup (xfree, path); |
98a5dd13 DE |
810 | |
811 | memcpy (path, dir, dir_len); | |
812 | path[dir_len] = '/'; | |
813 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
bccbefd2 | 814 | |
fde4f8ed | 815 | result = try_thread_db_load (path, 1); |
05386e9e TT |
816 | |
817 | do_cleanups (cleanup); | |
818 | return result; | |
98a5dd13 DE |
819 | } |
820 | ||
17a37d48 | 821 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
822 | to work on current inferior. |
823 | The result is true for success. */ | |
17a37d48 PP |
824 | |
825 | static int | |
826 | thread_db_load_search (void) | |
827 | { | |
e6712ff1 DE |
828 | VEC (char_ptr) *dir_vec; |
829 | struct cleanup *cleanups; | |
830 | char *this_dir; | |
831 | int i, rc = 0; | |
17a37d48 | 832 | |
e6712ff1 DE |
833 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
834 | cleanups = make_cleanup_free_char_ptr_vec (dir_vec); | |
835 | ||
836 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
17a37d48 | 837 | { |
e6712ff1 | 838 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 839 | size_t this_dir_len; |
e0881a8e | 840 | |
e6712ff1 | 841 | this_dir_len = strlen (this_dir); |
17a37d48 | 842 | |
e6712ff1 DE |
843 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
844 | && (this_dir[pdir_len] == '\0' | |
845 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 846 | { |
e6712ff1 | 847 | char *subdir = NULL; |
1fc3cf4a TT |
848 | struct cleanup *free_subdir_cleanup |
849 | = make_cleanup (null_cleanup, NULL); | |
e6712ff1 DE |
850 | |
851 | if (this_dir[pdir_len] == '/') | |
98a5dd13 | 852 | { |
224c3ddb | 853 | subdir = (char *) xmalloc (strlen (this_dir)); |
1fc3cf4a | 854 | make_cleanup (xfree, subdir); |
e6712ff1 | 855 | strcpy (subdir, this_dir + pdir_len + 1); |
98a5dd13 | 856 | } |
e6712ff1 | 857 | rc = try_thread_db_load_from_pdir (subdir); |
1fc3cf4a | 858 | do_cleanups (free_subdir_cleanup); |
e6712ff1 DE |
859 | if (rc) |
860 | break; | |
17a37d48 | 861 | } |
e6712ff1 | 862 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
863 | { |
864 | if (try_thread_db_load_from_sdir ()) | |
865 | { | |
866 | rc = 1; | |
867 | break; | |
868 | } | |
869 | } | |
870 | else | |
17a37d48 | 871 | { |
98a5dd13 DE |
872 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
873 | { | |
874 | rc = 1; | |
875 | break; | |
876 | } | |
17a37d48 PP |
877 | } |
878 | } | |
98a5dd13 | 879 | |
e6712ff1 | 880 | do_cleanups (cleanups); |
98a5dd13 | 881 | if (libthread_db_debug) |
883ed13e PA |
882 | fprintf_unfiltered (gdb_stdlog, |
883 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
884 | return rc; |
885 | } | |
886 | ||
98a5dd13 DE |
887 | /* Return non-zero if the inferior has a libpthread. */ |
888 | ||
889 | static int | |
890 | has_libpthread (void) | |
891 | { | |
892 | struct objfile *obj; | |
893 | ||
894 | ALL_OBJFILES (obj) | |
4262abfb | 895 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
896 | return 1; |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
17a37d48 | 901 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 902 | Return 1 on success. */ |
17a37d48 PP |
903 | |
904 | static int | |
905 | thread_db_load (void) | |
906 | { | |
d90e17a7 | 907 | struct thread_db_info *info; |
17a37d48 | 908 | |
dfd4cc63 | 909 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
910 | |
911 | if (info != NULL) | |
17a37d48 PP |
912 | return 1; |
913 | ||
856d6f99 PA |
914 | /* Don't attempt to use thread_db on executables not running |
915 | yet. */ | |
916 | if (!target_has_registers) | |
17a37d48 PP |
917 | return 0; |
918 | ||
919 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 920 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
921 | return 0; |
922 | ||
923 | if (thread_db_load_search ()) | |
924 | return 1; | |
925 | ||
98a5dd13 DE |
926 | /* We couldn't find a libthread_db. |
927 | If the inferior has a libpthread warn the user. */ | |
928 | if (has_libpthread ()) | |
929 | { | |
930 | warning (_("Unable to find libthread_db matching inferior's thread" | |
931 | " library, thread debugging will not be available.")); | |
932 | return 0; | |
17a37d48 | 933 | } |
98a5dd13 | 934 | |
17a37d48 PP |
935 | /* Either this executable isn't using libpthread at all, or it is |
936 | statically linked. Since we can't easily distinguish these two cases, | |
937 | no warning is issued. */ | |
938 | return 0; | |
939 | } | |
940 | ||
fb0e1ba7 MK |
941 | static void |
942 | check_thread_signals (void) | |
943 | { | |
21bf60fe | 944 | if (!thread_signals) |
fb0e1ba7 MK |
945 | { |
946 | sigset_t mask; | |
947 | int i; | |
948 | ||
669211f5 | 949 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
950 | sigemptyset (&thread_stop_set); |
951 | sigemptyset (&thread_print_set); | |
952 | ||
b9569773 | 953 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
954 | { |
955 | if (sigismember (&mask, i)) | |
956 | { | |
2ea28649 | 957 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 958 | sigaddset (&thread_stop_set, i); |
2ea28649 | 959 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
960 | sigaddset (&thread_print_set, i); |
961 | thread_signals = 1; | |
962 | } | |
963 | } | |
964 | } | |
fb0e1ba7 MK |
965 | } |
966 | ||
0ec9a092 DJ |
967 | /* Check whether thread_db is usable. This function is called when |
968 | an inferior is created (or otherwise acquired, e.g. attached to) | |
969 | and when new shared libraries are loaded into a running process. */ | |
970 | ||
971 | void | |
972 | check_for_thread_db (void) | |
fb0e1ba7 | 973 | { |
b5057acd | 974 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 975 | if (!thread_db_load ()) |
b5057acd | 976 | return; |
0ec9a092 DJ |
977 | } |
978 | ||
0838fb57 DE |
979 | /* This function is called via the new_objfile observer. */ |
980 | ||
0ec9a092 DJ |
981 | static void |
982 | thread_db_new_objfile (struct objfile *objfile) | |
983 | { | |
d90e17a7 PA |
984 | /* This observer must always be called with inferior_ptid set |
985 | correctly. */ | |
986 | ||
0838fb57 | 987 | if (objfile != NULL |
fcb44371 | 988 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 989 | loaded (and notified without successful thread_db initialization) |
fcb44371 JK |
990 | the time observer_notify_new_objfile is called for the library itself. |
991 | Static executables have their separate debug info loaded already | |
992 | before the inferior has started. */ | |
993 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
994 | /* Only check for thread_db if we loaded libpthread, |
995 | or if this is the main symbol file. | |
996 | We need to check OBJF_MAINLINE to handle the case of debugging | |
997 | a statically linked executable AND the symbol file is specified AFTER | |
998 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
999 | For dynamically linked executables, libpthread can be near the end | |
1000 | of the list of shared libraries to load, and in an app of several | |
1001 | thousand shared libraries, this can otherwise be painful. */ | |
1002 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1003 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1004 | check_for_thread_db (); |
fb0e1ba7 MK |
1005 | } |
1006 | ||
015de688 DC |
1007 | static void |
1008 | check_pid_namespace_match (void) | |
1009 | { | |
1010 | /* Check is only relevant for local targets targets. */ | |
1011 | if (target_can_run (¤t_target)) | |
1012 | { | |
1013 | /* If the child is in a different PID namespace, its idea of its | |
1014 | PID will differ from our idea of its PID. When we scan the | |
1015 | child's thread list, we'll mistakenly think it has no threads | |
1016 | since the thread PID fields won't match the PID we give to | |
1017 | libthread_db. */ | |
9bc3a976 | 1018 | if (!linux_ns_same (ptid_get_pid (inferior_ptid), LINUX_NS_PID)) |
015de688 DC |
1019 | { |
1020 | warning (_ ("Target and debugger are in different PID " | |
1021 | "namespaces; thread lists and other data are " | |
1022 | "likely unreliable")); | |
1023 | } | |
015de688 DC |
1024 | } |
1025 | } | |
1026 | ||
0838fb57 DE |
1027 | /* This function is called via the inferior_created observer. |
1028 | This handles the case of debugging statically linked executables. */ | |
1029 | ||
1030 | static void | |
1031 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1032 | { | |
015de688 | 1033 | check_pid_namespace_match (); |
0838fb57 DE |
1034 | check_for_thread_db (); |
1035 | } | |
1036 | ||
c1a747c1 PA |
1037 | /* Update the thread's state (what's displayed in "info threads"), |
1038 | from libthread_db thread state information. */ | |
1039 | ||
1040 | static void | |
fe978cb0 | 1041 | update_thread_state (struct private_thread_info *priv, |
c1a747c1 PA |
1042 | const td_thrinfo_t *ti_p) |
1043 | { | |
fe978cb0 PA |
1044 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1045 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1046 | } |
1047 | ||
2db9a427 | 1048 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1049 | private info. If TP is NULL or TP is marked as having exited, |
1050 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1051 | |
be550b6e | 1052 | static struct thread_info * |
2db9a427 PA |
1053 | record_thread (struct thread_db_info *info, |
1054 | struct thread_info *tp, | |
1055 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1056 | const td_thrinfo_t *ti_p) | |
1057 | { | |
1058 | td_err_e err; | |
fe978cb0 | 1059 | struct private_thread_info *priv; |
2db9a427 PA |
1060 | int new_thread = (tp == NULL); |
1061 | ||
1062 | /* A thread ID of zero may mean the thread library has not | |
1063 | initialized yet. Leave private == NULL until the thread library | |
1064 | has initialized. */ | |
1065 | if (ti_p->ti_tid == 0) | |
be550b6e | 1066 | return tp; |
2db9a427 | 1067 | |
17faa917 | 1068 | /* Construct the thread's private data. */ |
8d749320 | 1069 | priv = XCNEW (struct private_thread_info); |
17faa917 | 1070 | |
fe978cb0 PA |
1071 | priv->th = *th_p; |
1072 | priv->tid = ti_p->ti_tid; | |
1073 | update_thread_state (priv, ti_p); | |
17faa917 | 1074 | |
4eec2deb PA |
1075 | /* Add the thread to GDB's thread list. If we already know about a |
1076 | thread with this PTID, but it's marked exited, then the kernel | |
1077 | reused the tid of an old thread. */ | |
1078 | if (tp == NULL || tp->state == THREAD_EXITED) | |
fe978cb0 | 1079 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1080 | else |
fe978cb0 | 1081 | tp->priv = priv; |
5365276c | 1082 | |
2db9a427 PA |
1083 | if (target_has_execution) |
1084 | check_thread_signals (); | |
be550b6e DE |
1085 | |
1086 | return tp; | |
fb0e1ba7 MK |
1087 | } |
1088 | ||
fb0e1ba7 | 1089 | static void |
52554a0e | 1090 | thread_db_detach (struct target_ops *ops, const char *args, int from_tty) |
fb0e1ba7 | 1091 | { |
117de6a9 | 1092 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1093 | struct thread_db_info *info; |
117de6a9 | 1094 | |
dfd4cc63 | 1095 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
c194fbe1 | 1096 | |
d90e17a7 | 1097 | if (info) |
c2c2a31f | 1098 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
4105de34 | 1099 | |
7a7d3353 | 1100 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1101 | |
1102 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1103 | ||
1104 | /* If there are no more processes using libpthread, detach the | |
1105 | thread_db target ops. */ | |
1106 | if (!thread_db_list) | |
1107 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1108 | } |
1109 | ||
39f77062 | 1110 | static ptid_t |
117de6a9 | 1111 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1112 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1113 | int options) | |
fb0e1ba7 | 1114 | { |
d90e17a7 | 1115 | struct thread_db_info *info; |
117de6a9 PA |
1116 | struct target_ops *beneath = find_target_beneath (ops); |
1117 | ||
47608cb1 | 1118 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1119 | |
b84876c2 PA |
1120 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1121 | return ptid; | |
1122 | ||
1111f4aa | 1123 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1124 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1125 | return ptid; | |
fb0e1ba7 | 1126 | |
dfd4cc63 | 1127 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1128 | |
1129 | /* If this process isn't using thread_db, we're done. */ | |
1130 | if (info == NULL) | |
1131 | return ptid; | |
1132 | ||
3f64f7b1 DJ |
1133 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1134 | { | |
d90e17a7 PA |
1135 | /* New image, it may or may not end up using thread_db. Assume |
1136 | not unless we find otherwise. */ | |
dfd4cc63 | 1137 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1138 | if (!thread_db_list) |
1139 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1140 | |
49fd4a42 | 1141 | return ptid; |
3f64f7b1 DJ |
1142 | } |
1143 | ||
2db9a427 PA |
1144 | /* Fill in the thread's user-level thread id and status. */ |
1145 | thread_from_lwp (ptid); | |
fb0e1ba7 | 1146 | |
b9b5d7ea | 1147 | return ptid; |
fb0e1ba7 MK |
1148 | } |
1149 | ||
fb0e1ba7 | 1150 | static void |
136d6dae | 1151 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1152 | { |
117de6a9 PA |
1153 | struct target_ops *target_beneath = find_target_beneath (ops); |
1154 | ||
dfd4cc63 | 1155 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1156 | |
d90e17a7 PA |
1157 | target_beneath->to_mourn_inferior (target_beneath); |
1158 | ||
b26a6851 | 1159 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1160 | if (!thread_db_list) |
1161 | unpush_target (ops); | |
fb0e1ba7 MK |
1162 | } |
1163 | ||
02c6c942 PP |
1164 | struct callback_data |
1165 | { | |
1166 | struct thread_db_info *info; | |
1167 | int new_threads; | |
1168 | }; | |
1169 | ||
fb0e1ba7 MK |
1170 | static int |
1171 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1172 | { | |
1173 | td_thrinfo_t ti; | |
1174 | td_err_e err; | |
39f77062 | 1175 | ptid_t ptid; |
403fe197 | 1176 | struct thread_info *tp; |
9a3c8263 | 1177 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1178 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1179 | |
d90e17a7 | 1180 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1181 | if (err != TD_OK) |
8a3fe4f8 | 1182 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1183 | thread_db_err_str (err)); |
fb0e1ba7 | 1184 | |
a33e3959 PA |
1185 | if (ti.ti_lid == -1) |
1186 | { | |
1187 | /* A thread with kernel thread ID -1 is either a thread that | |
1188 | exited and was joined, or a thread that is being created but | |
1189 | hasn't started yet, and that is reusing the tcb/stack of a | |
1190 | thread that previously exited and was joined. (glibc marks | |
1191 | terminated and joined threads with kernel thread ID -1. See | |
1192 | glibc PR17707. */ | |
d6c146e9 PA |
1193 | if (libthread_db_debug) |
1194 | fprintf_unfiltered (gdb_stdlog, | |
1195 | "thread_db: skipping exited and " | |
d41401ac DE |
1196 | "joined thread (0x%lx)\n", |
1197 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1198 | return 0; |
1199 | } | |
1200 | ||
254f582e | 1201 | if (ti.ti_tid == 0) |
4105de34 DJ |
1202 | { |
1203 | /* A thread ID of zero means that this is the main thread, but | |
1204 | glibc has not yet initialized thread-local storage and the | |
1205 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1206 | be yet. */ |
4105de34 | 1207 | |
4d062f1a PA |
1208 | /* In that case, we're not stopped in a fork syscall and don't |
1209 | need this glibc bug workaround. */ | |
1210 | info->need_stale_parent_threads_check = 0; | |
1211 | ||
4105de34 DJ |
1212 | return 0; |
1213 | } | |
1214 | ||
4d062f1a PA |
1215 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1216 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1217 | avoid doing the work if we know we don't have to. */ | |
1218 | if (info->need_stale_parent_threads_check) | |
1219 | { | |
1220 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1221 | |
4d062f1a PA |
1222 | if (tgid != -1 && tgid != info->pid) |
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1227 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1228 | if (tp == NULL || tp->priv == NULL) |
c2c2a31f | 1229 | thread_from_lwp (ptid); |
fb0e1ba7 MK |
1230 | |
1231 | return 0; | |
1232 | } | |
1233 | ||
02c6c942 PP |
1234 | /* Helper for thread_db_find_new_threads_2. |
1235 | Returns number of new threads found. */ | |
1236 | ||
1237 | static int | |
1238 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1239 | td_err_e *errp) |
02c6c942 | 1240 | { |
02c6c942 | 1241 | struct callback_data data; |
fb169834 | 1242 | td_err_e err = TD_ERR; |
02c6c942 PP |
1243 | |
1244 | data.info = info; | |
1245 | data.new_threads = 0; | |
1246 | ||
2db9a427 | 1247 | /* See comment in thread_db_update_thread_list. */ |
c2c2a31f | 1248 | gdb_assert (!target_has_execution); |
2db9a427 | 1249 | |
492d29ea | 1250 | TRY |
02c6c942 PP |
1251 | { |
1252 | /* Iterate over all user-space threads to discover new threads. */ | |
1253 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1254 | find_new_threads_callback, | |
1255 | &data, | |
1256 | TD_THR_ANY_STATE, | |
1257 | TD_THR_LOWEST_PRIORITY, | |
1258 | TD_SIGNO_MASK, | |
1259 | TD_THR_ANY_USER_FLAGS); | |
1260 | } | |
6c63c96a | 1261 | CATCH (except, RETURN_MASK_ERROR) |
02c6c942 | 1262 | { |
6c63c96a | 1263 | if (libthread_db_debug) |
492d29ea PA |
1264 | { |
1265 | exception_fprintf (gdb_stdlog, except, | |
1266 | "Warning: find_new_threads_once: "); | |
1267 | } | |
6c63c96a PA |
1268 | } |
1269 | END_CATCH | |
02c6c942 | 1270 | |
6c63c96a PA |
1271 | if (libthread_db_debug) |
1272 | { | |
883ed13e PA |
1273 | fprintf_unfiltered (gdb_stdlog, |
1274 | _("Found %d new threads in iteration %d.\n"), | |
1275 | data.new_threads, iteration); | |
02c6c942 PP |
1276 | } |
1277 | ||
1278 | if (errp != NULL) | |
1279 | *errp = err; | |
1280 | ||
1281 | return data.new_threads; | |
1282 | } | |
1283 | ||
4c28f408 | 1284 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1285 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1286 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1287 | |
fb0e1ba7 | 1288 | static void |
02c6c942 | 1289 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1290 | { |
fcb44371 | 1291 | td_err_e err = TD_OK; |
d90e17a7 | 1292 | struct thread_db_info *info; |
02c6c942 | 1293 | int i, loop; |
4c28f408 | 1294 | |
dfd4cc63 | 1295 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1296 | |
4c28f408 | 1297 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1298 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1299 | |
1300 | if (until_no_new) | |
1301 | { | |
1302 | /* Require 4 successive iterations which do not find any new threads. | |
1303 | The 4 is a heuristic: there is an inherent race here, and I have | |
1304 | seen that 2 iterations in a row are not always sufficient to | |
1305 | "capture" all threads. */ | |
fcb44371 JK |
1306 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1307 | if (find_new_threads_once (info, i, &err) != 0) | |
1308 | { | |
1309 | /* Found some new threads. Restart the loop from beginning. */ | |
1310 | loop = -1; | |
1311 | } | |
02c6c942 PP |
1312 | } |
1313 | else | |
fcb44371 JK |
1314 | find_new_threads_once (info, 0, &err); |
1315 | ||
1316 | if (err != TD_OK) | |
1317 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1318 | } |
1319 | ||
02c6c942 PP |
1320 | static void |
1321 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1322 | { | |
1323 | thread_db_find_new_threads_2 (ptid, 0); | |
1324 | } | |
1325 | ||
dc146f7c VP |
1326 | static int |
1327 | update_thread_core (struct lwp_info *info, void *closure) | |
1328 | { | |
2e794194 | 1329 | info->core = linux_common_core_of_thread (info->ptid); |
dc146f7c VP |
1330 | return 0; |
1331 | } | |
02c6c942 | 1332 | |
2db9a427 PA |
1333 | /* Update the thread list using td_ta_thr_iter. */ |
1334 | ||
28439f5e | 1335 | static void |
2db9a427 | 1336 | thread_db_update_thread_list_td_ta_thr_iter (struct target_ops *ops) |
28439f5e | 1337 | { |
d90e17a7 | 1338 | struct thread_db_info *info; |
c65b3e0d | 1339 | struct inferior *inf; |
d90e17a7 | 1340 | |
e8032dde PA |
1341 | prune_threads (); |
1342 | ||
c65b3e0d PA |
1343 | ALL_INFERIORS (inf) |
1344 | { | |
1345 | struct thread_info *thread; | |
d90e17a7 | 1346 | |
c65b3e0d PA |
1347 | if (inf->pid == 0) |
1348 | continue; | |
d90e17a7 | 1349 | |
c65b3e0d PA |
1350 | info = get_thread_db_info (inf->pid); |
1351 | if (info == NULL) | |
1352 | continue; | |
1353 | ||
1354 | thread = any_live_thread_of_process (inf->pid); | |
1355 | if (thread == NULL || thread->executing) | |
1356 | continue; | |
1357 | ||
1358 | thread_db_find_new_threads_1 (thread->ptid); | |
1359 | } | |
2db9a427 PA |
1360 | } |
1361 | ||
1362 | /* Implement the to_update_thread_list target method for this | |
1363 | target. */ | |
1364 | ||
1365 | static void | |
1366 | thread_db_update_thread_list (struct target_ops *ops) | |
1367 | { | |
1368 | /* It's best to avoid td_ta_thr_iter if possible. That walks data | |
1369 | structures in the inferior's address space that may be corrupted, | |
1370 | or, if the target is running, the list may change while we walk | |
1371 | it. In the latter case, it's possible that a thread exits just | |
1372 | at the exact time that causes GDB to get stuck in an infinite | |
1373 | loop. To avoid pausing all threads whenever the core wants to | |
c2c2a31f AT |
1374 | refresh the thread list, use thread_from_lwp immediately when we |
1375 | see an LWP stop. That uses thread_db entry points that do not | |
1376 | walk libpthread's thread list, so should be safe, as well as | |
1377 | more efficient. */ | |
1378 | if (target_has_execution) | |
2db9a427 PA |
1379 | ops->beneath->to_update_thread_list (ops->beneath); |
1380 | else | |
1381 | thread_db_update_thread_list_td_ta_thr_iter (ops); | |
dc146f7c | 1382 | |
856d6f99 PA |
1383 | if (target_has_execution) |
1384 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1385 | update_thread_core, NULL); | |
28439f5e PA |
1386 | } |
1387 | ||
fb0e1ba7 | 1388 | static char * |
117de6a9 | 1389 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1390 | { |
e09875d4 | 1391 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1392 | struct target_ops *beneath; |
17faa917 | 1393 | |
fe978cb0 | 1394 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1395 | { |
1396 | static char buf[64]; | |
17faa917 | 1397 | thread_t tid; |
fb0e1ba7 | 1398 | |
fe978cb0 | 1399 | tid = thread_info->priv->tid; |
17faa917 | 1400 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
d41401ac | 1401 | (unsigned long) tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1402 | |
1403 | return buf; | |
1404 | } | |
1405 | ||
117de6a9 | 1406 | beneath = find_target_beneath (ops); |
e75fdfca | 1407 | return beneath->to_pid_to_str (beneath, ptid); |
fb0e1ba7 MK |
1408 | } |
1409 | ||
28b17333 DJ |
1410 | /* Return a string describing the state of the thread specified by |
1411 | INFO. */ | |
1412 | ||
1413 | static char * | |
c15906d8 TT |
1414 | thread_db_extra_thread_info (struct target_ops *self, |
1415 | struct thread_info *info) | |
28b17333 | 1416 | { |
fe978cb0 | 1417 | if (info->priv == NULL) |
17faa917 DJ |
1418 | return NULL; |
1419 | ||
fe978cb0 | 1420 | if (info->priv->dying) |
28b17333 DJ |
1421 | return "Exiting"; |
1422 | ||
1423 | return NULL; | |
1424 | } | |
1425 | ||
b2756930 KB |
1426 | /* Get the address of the thread local variable in load module LM which |
1427 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1428 | |
1429 | static CORE_ADDR | |
117de6a9 PA |
1430 | thread_db_get_thread_local_address (struct target_ops *ops, |
1431 | ptid_t ptid, | |
b2756930 | 1432 | CORE_ADDR lm, |
b4acd559 | 1433 | CORE_ADDR offset) |
3f47be5c | 1434 | { |
17faa917 | 1435 | struct thread_info *thread_info; |
117de6a9 | 1436 | struct target_ops *beneath; |
17faa917 | 1437 | |
17faa917 | 1438 | /* Find the matching thread. */ |
e09875d4 | 1439 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1440 | |
e0fd7c47 UW |
1441 | /* We may not have discovered the thread yet. */ |
1442 | if (thread_info != NULL && thread_info->priv == NULL) | |
be550b6e | 1443 | thread_info = thread_from_lwp (ptid); |
e0fd7c47 | 1444 | |
fe978cb0 | 1445 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1446 | { |
3f47be5c | 1447 | td_err_e err; |
00f515da | 1448 | psaddr_t address; |
d90e17a7 PA |
1449 | struct thread_db_info *info; |
1450 | ||
dfd4cc63 | 1451 | info = get_thread_db_info (ptid_get_pid (ptid)); |
3f47be5c | 1452 | |
3f47be5c | 1453 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1454 | if (lm != 0) |
1455 | { | |
1456 | /* glibc doesn't provide the needed interface. */ | |
1457 | if (!info->td_thr_tls_get_addr_p) | |
1458 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1459 | _("No TLS library support")); | |
1460 | ||
1461 | /* Note the cast through uintptr_t: this interface only works if | |
1462 | a target address fits in a psaddr_t, which is a host pointer. | |
1463 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
fe978cb0 | 1464 | err = info->td_thr_tls_get_addr_p (&thread_info->priv->th, |
5876f503 JK |
1465 | (psaddr_t)(uintptr_t) lm, |
1466 | offset, &address); | |
1467 | } | |
1468 | else | |
1469 | { | |
1470 | /* If glibc doesn't provide the needed interface throw an error | |
1471 | that LM is zero - normally cases it should not be. */ | |
1472 | if (!info->td_thr_tlsbase_p) | |
1473 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1474 | _("TLS load module not found")); | |
1475 | ||
1476 | /* This code path handles the case of -static -pthread executables: | |
1477 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1478 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1479 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1480 | The constant number 1 depends on GNU __libc_setup_tls | |
1481 | initialization of l_tls_modid to 1. */ | |
fe978cb0 | 1482 | err = info->td_thr_tlsbase_p (&thread_info->priv->th, |
5876f503 JK |
1483 | 1, &address); |
1484 | address = (char *) address + offset; | |
1485 | } | |
3f47be5c EZ |
1486 | |
1487 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1488 | /* The memory hasn't been allocated, yet. */ | |
1489 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1490 | /* Now, if libthread_db provided the initialization image's |
1491 | address, we *could* try to build a non-lvalue value from | |
1492 | the initialization image. */ | |
109c3e39 AC |
1493 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1494 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1495 | #endif |
1496 | ||
1497 | /* Something else went wrong. */ | |
1498 | if (err != TD_OK) | |
109c3e39 AC |
1499 | throw_error (TLS_GENERIC_ERROR, |
1500 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1501 | |
1502 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1503 | /* Do proper sign extension for the target. */ |
1504 | gdb_assert (exec_bfd); | |
1505 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1506 | ? (CORE_ADDR) (intptr_t) address | |
1507 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1508 | } |
1509 | ||
117de6a9 | 1510 | beneath = find_target_beneath (ops); |
f0f9ff95 | 1511 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); |
3f47be5c EZ |
1512 | } |
1513 | ||
0ef643c8 JB |
1514 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1515 | ||
1516 | static ptid_t | |
1e6b91a4 | 1517 | thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) |
0ef643c8 | 1518 | { |
2db9a427 PA |
1519 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
1520 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
0ef643c8 JB |
1521 | } |
1522 | ||
4d062f1a PA |
1523 | static void |
1524 | thread_db_resume (struct target_ops *ops, | |
2ea28649 | 1525 | ptid_t ptid, int step, enum gdb_signal signo) |
4d062f1a PA |
1526 | { |
1527 | struct target_ops *beneath = find_target_beneath (ops); | |
1528 | struct thread_db_info *info; | |
1529 | ||
1530 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1531 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1532 | else |
dfd4cc63 | 1533 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1534 | |
1535 | /* This workaround is only needed for child fork lwps stopped in a | |
1536 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1537 | workaround can be disabled. */ | |
1538 | if (info) | |
1539 | info->need_stale_parent_threads_check = 0; | |
1540 | ||
1541 | beneath->to_resume (beneath, ptid, step, signo); | |
1542 | } | |
1543 | ||
bf88dd68 JK |
1544 | /* qsort helper function for info_auto_load_libthread_db, sort the |
1545 | thread_db_info pointers primarily by their FILENAME and secondarily by their | |
1546 | PID, both in ascending order. */ | |
1547 | ||
1548 | static int | |
1549 | info_auto_load_libthread_db_compare (const void *ap, const void *bp) | |
1550 | { | |
1551 | struct thread_db_info *a = *(struct thread_db_info **) ap; | |
1552 | struct thread_db_info *b = *(struct thread_db_info **) bp; | |
1553 | int retval; | |
1554 | ||
1555 | retval = strcmp (a->filename, b->filename); | |
1556 | if (retval) | |
1557 | return retval; | |
1558 | ||
1559 | return (a->pid > b->pid) - (a->pid - b->pid); | |
1560 | } | |
1561 | ||
1562 | /* Implement 'info auto-load libthread-db'. */ | |
1563 | ||
1564 | static void | |
1565 | info_auto_load_libthread_db (char *args, int from_tty) | |
1566 | { | |
1567 | struct ui_out *uiout = current_uiout; | |
1568 | const char *cs = args ? args : ""; | |
1569 | struct thread_db_info *info, **array; | |
1570 | unsigned info_count, unique_filenames; | |
1571 | size_t max_filename_len, max_pids_len, pids_len; | |
1572 | struct cleanup *back_to; | |
1573 | char *pids; | |
1574 | int i; | |
1575 | ||
529480d0 | 1576 | cs = skip_spaces_const (cs); |
bf88dd68 JK |
1577 | if (*cs) |
1578 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1579 | ||
1580 | info_count = 0; | |
1581 | for (info = thread_db_list; info; info = info->next) | |
1582 | if (info->filename != NULL) | |
1583 | info_count++; | |
1584 | ||
8d749320 | 1585 | array = XNEWVEC (struct thread_db_info *, info_count); |
bf88dd68 JK |
1586 | back_to = make_cleanup (xfree, array); |
1587 | ||
1588 | info_count = 0; | |
1589 | for (info = thread_db_list; info; info = info->next) | |
1590 | if (info->filename != NULL) | |
1591 | array[info_count++] = info; | |
1592 | ||
1593 | /* Sort ARRAY by filenames and PIDs. */ | |
1594 | ||
1595 | qsort (array, info_count, sizeof (*array), | |
1596 | info_auto_load_libthread_db_compare); | |
1597 | ||
1598 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1599 | length of PIDs list for the unique filenames (columns). */ | |
1600 | ||
1601 | unique_filenames = 0; | |
1602 | max_filename_len = 0; | |
1603 | max_pids_len = 0; | |
1604 | pids_len = 0; | |
1605 | for (i = 0; i < info_count; i++) | |
1606 | { | |
1607 | int pid = array[i]->pid; | |
1608 | size_t this_pid_len; | |
1609 | ||
1610 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1611 | this_pid_len++; | |
1612 | ||
1613 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1614 | { | |
1615 | unique_filenames++; | |
1616 | max_filename_len = max (max_filename_len, | |
1617 | strlen (array[i]->filename)); | |
1618 | ||
1619 | if (i > 0) | |
1620 | { | |
1621 | pids_len -= strlen (", "); | |
1622 | max_pids_len = max (max_pids_len, pids_len); | |
1623 | } | |
1624 | pids_len = 0; | |
1625 | } | |
1626 | pids_len += this_pid_len + strlen (", "); | |
1627 | } | |
1628 | if (i) | |
1629 | { | |
1630 | pids_len -= strlen (", "); | |
1631 | max_pids_len = max (max_pids_len, pids_len); | |
1632 | } | |
1633 | ||
1634 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1635 | its columns. */ | |
1636 | if (info_count > 0 && args == auto_load_info_scripts_pattern_nl) | |
1637 | ui_out_text (uiout, "\n"); | |
1638 | ||
1639 | make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames, | |
1640 | "LinuxThreadDbTable"); | |
1641 | ||
1642 | ui_out_table_header (uiout, max_filename_len, ui_left, "filename", | |
1643 | "Filename"); | |
1644 | ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids"); | |
1645 | ui_out_table_body (uiout); | |
1646 | ||
224c3ddb | 1647 | pids = (char *) xmalloc (max_pids_len + 1); |
bf88dd68 JK |
1648 | make_cleanup (xfree, pids); |
1649 | ||
1650 | /* Note I is incremented inside the cycle, not at its end. */ | |
1651 | for (i = 0; i < info_count;) | |
1652 | { | |
1653 | struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); | |
1654 | char *pids_end; | |
1655 | ||
1656 | info = array[i]; | |
1657 | ui_out_field_string (uiout, "filename", info->filename); | |
1658 | pids_end = pids; | |
1659 | ||
1660 | while (i < info_count && strcmp (info->filename, array[i]->filename) == 0) | |
1661 | { | |
1662 | if (pids_end != pids) | |
1663 | { | |
1664 | *pids_end++ = ','; | |
1665 | *pids_end++ = ' '; | |
1666 | } | |
1667 | pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end, | |
1668 | "%u", array[i]->pid); | |
1669 | gdb_assert (pids_end < &pids[max_pids_len + 1]); | |
1670 | ||
1671 | i++; | |
1672 | } | |
1673 | *pids_end = '\0'; | |
1674 | ||
1675 | ui_out_field_string (uiout, "pids", pids); | |
1676 | ||
1677 | ui_out_text (uiout, "\n"); | |
1678 | do_cleanups (chain); | |
1679 | } | |
1680 | ||
1681 | do_cleanups (back_to); | |
1682 | ||
1683 | if (info_count == 0) | |
1684 | ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n")); | |
1685 | } | |
1686 | ||
fb0e1ba7 MK |
1687 | static void |
1688 | init_thread_db_ops (void) | |
1689 | { | |
1690 | thread_db_ops.to_shortname = "multi-thread"; | |
1691 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1692 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1693 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1694 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1695 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1696 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
e8032dde | 1697 | thread_db_ops.to_update_thread_list = thread_db_update_thread_list; |
fb0e1ba7 MK |
1698 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
1699 | thread_db_ops.to_stratum = thread_stratum; | |
1700 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1701 | thread_db_ops.to_get_thread_local_address |
1702 | = thread_db_get_thread_local_address; | |
28b17333 | 1703 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1704 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 | 1705 | thread_db_ops.to_magic = OPS_MAGIC; |
c22a2b88 TT |
1706 | |
1707 | complete_target_initialization (&thread_db_ops); | |
fb0e1ba7 MK |
1708 | } |
1709 | ||
2c0b251b PA |
1710 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1711 | extern initialize_file_ftype _initialize_thread_db; | |
1712 | ||
fb0e1ba7 MK |
1713 | void |
1714 | _initialize_thread_db (void) | |
1715 | { | |
17a37d48 | 1716 | init_thread_db_ops (); |
17a37d48 PP |
1717 | |
1718 | /* Defer loading of libthread_db.so until inferior is running. | |
1719 | This allows gdb to load correct libthread_db for a given | |
1720 | executable -- there could be mutiple versions of glibc, | |
1721 | compiled with LinuxThreads or NPTL, and until there is | |
1722 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 1723 | the correct one to load. */ |
17a37d48 PP |
1724 | |
1725 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1726 | ||
1727 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1728 | class_support, | |
1729 | &libthread_db_search_path, _("\ | |
1730 | Set search path for libthread_db."), _("\ | |
1731 | Show the current search path or libthread_db."), _("\ | |
1732 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1733 | gdb itself.\n\ |
1734 | Its value is a colon (':') separate list of directories to search.\n\ | |
1735 | Setting the search path to an empty list resets it to its default value."), | |
1736 | set_libthread_db_search_path, | |
17a37d48 PP |
1737 | NULL, |
1738 | &setlist, &showlist); | |
02d868e8 | 1739 | |
ccce17b0 YQ |
1740 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1741 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1742 | Set libthread-db debugging."), _("\ |
1743 | Show libthread-db debugging."), _("\ | |
1744 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
1745 | NULL, |
1746 | show_libthread_db_debug, | |
1747 | &setdebuglist, &showdebuglist); | |
02d868e8 | 1748 | |
bf88dd68 JK |
1749 | add_setshow_boolean_cmd ("libthread-db", class_support, |
1750 | &auto_load_thread_db, _("\ | |
1751 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
1752 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
1753 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
1754 | locations to load libthread_db compatible with the inferior.\n\ | |
1755 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
1756 | This options has security implications for untrusted inferiors."), | |
1757 | NULL, show_auto_load_thread_db, | |
1758 | auto_load_set_cmdlist_get (), | |
1759 | auto_load_show_cmdlist_get ()); | |
1760 | ||
1761 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
1762 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
1763 | Usage: info auto-load libthread-db"), | |
1764 | auto_load_info_cmdlist_get ()); | |
1765 | ||
17a37d48 PP |
1766 | /* Add ourselves to objfile event chain. */ |
1767 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
1768 | |
1769 | /* Add ourselves to inferior_created event chain. | |
1770 | This is needed to handle debugging statically linked programs where | |
1771 | the new_objfile observer won't get called for libpthread. */ | |
1772 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 1773 | } |