Commit | Line | Data |
---|---|---|
fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
ecd75fc8 | 3 | Copyright (C) 1999-2014 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 GB |
40 | #include "nat/linux-procfs.h" |
41 | #include "nat/linux-osdata.h" | |
bf88dd68 | 42 | #include "auto-load.h" |
529480d0 | 43 | #include "cli/cli-utils.h" |
fb0e1ba7 | 44 | |
979894f2 | 45 | #include <signal.h> |
bf88dd68 | 46 | #include <ctype.h> |
979894f2 | 47 | |
17faa917 DJ |
48 | /* GNU/Linux libthread_db support. |
49 | ||
50 | libthread_db is a library, provided along with libpthread.so, which | |
51 | exposes the internals of the thread library to a debugger. It | |
52 | allows GDB to find existing threads, new threads as they are | |
53 | created, thread IDs (usually, the result of pthread_self), and | |
54 | thread-local variables. | |
55 | ||
56 | The libthread_db interface originates on Solaris, where it is | |
57 | both more powerful and more complicated. This implementation | |
58 | only works for LinuxThreads and NPTL, the two glibc threading | |
59 | libraries. It assumes that each thread is permanently assigned | |
60 | to a single light-weight process (LWP). | |
61 | ||
62 | libthread_db-specific information is stored in the "private" field | |
63 | of struct thread_info. When the field is NULL we do not yet have | |
64 | information about the new thread; this could be temporary (created, | |
65 | but the thread library's data structures do not reflect it yet) | |
66 | or permanent (created using clone instead of pthread_create). | |
67 | ||
68 | Process IDs managed by linux-thread-db.c match those used by | |
69 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
70 | thread, and no TID. We save the TID in private. Keeping it out | |
71 | of the ptid_t prevents thread IDs changing when libpthread is | |
72 | loaded or unloaded. */ | |
73 | ||
17a37d48 PP |
74 | static char *libthread_db_search_path; |
75 | ||
bf88dd68 JK |
76 | /* Set to non-zero if thread_db auto-loading is enabled |
77 | by the "set auto-load libthread-db" command. */ | |
78 | static int auto_load_thread_db = 1; | |
79 | ||
80 | /* "show" command for the auto_load_thread_db configuration variable. */ | |
81 | ||
82 | static void | |
83 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
84 | struct cmd_list_element *c, const char *value) | |
85 | { | |
86 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
87 | "is %s.\n"), | |
88 | value); | |
89 | } | |
90 | ||
84e578fb DE |
91 | static void |
92 | set_libthread_db_search_path (char *ignored, int from_tty, | |
93 | struct cmd_list_element *c) | |
94 | { | |
95 | if (*libthread_db_search_path == '\0') | |
96 | { | |
97 | xfree (libthread_db_search_path); | |
98 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
99 | } | |
100 | } | |
101 | ||
02d868e8 PP |
102 | /* If non-zero, print details of libthread_db processing. */ |
103 | ||
ccce17b0 | 104 | static unsigned int libthread_db_debug; |
02d868e8 PP |
105 | |
106 | static void | |
107 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
108 | struct cmd_list_element *c, const char *value) | |
109 | { | |
110 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
111 | } | |
112 | ||
8605d56e AC |
113 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
114 | threads. */ | |
fb0e1ba7 | 115 | |
fb0e1ba7 MK |
116 | /* This module's target vector. */ |
117 | static struct target_ops thread_db_ops; | |
118 | ||
fb0e1ba7 MK |
119 | /* Non-zero if we have determined the signals used by the threads |
120 | library. */ | |
121 | static int thread_signals; | |
122 | static sigset_t thread_stop_set; | |
123 | static sigset_t thread_print_set; | |
124 | ||
d90e17a7 PA |
125 | struct thread_db_info |
126 | { | |
127 | struct thread_db_info *next; | |
128 | ||
129 | /* Process id this object refers to. */ | |
130 | int pid; | |
131 | ||
132 | /* Handle from dlopen for libthread_db.so. */ | |
133 | void *handle; | |
134 | ||
bf88dd68 JK |
135 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
136 | HANDLE. It may be NULL for system library. */ | |
137 | char *filename; | |
138 | ||
d90e17a7 PA |
139 | /* Structure that identifies the child process for the |
140 | <proc_service.h> interface. */ | |
141 | struct ps_prochandle proc_handle; | |
142 | ||
143 | /* Connection to the libthread_db library. */ | |
144 | td_thragent_t *thread_agent; | |
145 | ||
4d062f1a PA |
146 | /* True if we need to apply the workaround for glibc/BZ5983. When |
147 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
148 | list, nptl_db returns the parent's threads in addition to the new | |
149 | (single) child thread. If this flag is set, we do extra work to | |
150 | be able to ignore such stale entries. */ | |
151 | int need_stale_parent_threads_check; | |
152 | ||
d90e17a7 PA |
153 | /* Location of the thread creation event breakpoint. The code at |
154 | this location in the child process will be called by the pthread | |
155 | library whenever a new thread is created. By setting a special | |
156 | breakpoint at this location, GDB can detect when a new thread is | |
157 | created. We obtain this location via the td_ta_event_addr | |
158 | call. */ | |
159 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 160 | |
d90e17a7 PA |
161 | /* Location of the thread death event breakpoint. */ |
162 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 163 | |
d90e17a7 | 164 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 165 | |
d90e17a7 | 166 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 167 | |
d90e17a7 | 168 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 169 | td_thragent_t **ta); |
d90e17a7 PA |
170 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
171 | td_thrhandle_t *__th); | |
172 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
173 | lwpid_t lwpid, td_thrhandle_t *th); | |
174 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
175 | td_thr_iter_f *callback, void *cbdata_p, | |
176 | td_thr_state_e state, int ti_pri, | |
177 | sigset_t *ti_sigmask_p, | |
178 | unsigned int ti_user_flags); | |
179 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
180 | td_event_e event, td_notify_t *ptr); | |
181 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
182 | td_thr_events_t *event); | |
21e1bee4 PP |
183 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
184 | td_thr_events_t *event); | |
d90e17a7 PA |
185 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
186 | td_event_msg_t *msg); | |
187 | ||
188 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
189 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
190 | td_thrinfo_t *infop); | |
191 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
192 | int event); | |
193 | ||
194 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
195 | psaddr_t map_address, |
196 | size_t offset, psaddr_t *address); | |
5876f503 JK |
197 | td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th, |
198 | unsigned long int modid, | |
199 | psaddr_t *base); | |
d90e17a7 PA |
200 | }; |
201 | ||
202 | /* List of known processes using thread_db, and the required | |
203 | bookkeeping. */ | |
204 | struct thread_db_info *thread_db_list; | |
205 | ||
206 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 207 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 PA |
208 | |
209 | /* Add the current inferior to the list of processes using libpthread. | |
210 | Return a pointer to the newly allocated object that was added to | |
211 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
212 | LIBTHREAD_DB_SO. */ | |
213 | ||
214 | static struct thread_db_info * | |
215 | add_thread_db_info (void *handle) | |
216 | { | |
d90e17a7 PA |
217 | struct thread_db_info *info; |
218 | ||
219 | info = xcalloc (1, sizeof (*info)); | |
220 | info->pid = ptid_get_pid (inferior_ptid); | |
221 | info->handle = handle; | |
856d6f99 PA |
222 | |
223 | /* The workaround works by reading from /proc/pid/status, so it is | |
224 | disabled for core files. */ | |
225 | if (target_has_execution) | |
226 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
227 | |
228 | info->next = thread_db_list; | |
229 | thread_db_list = info; | |
230 | ||
231 | return info; | |
232 | } | |
233 | ||
234 | /* Return the thread_db_info object representing the bookkeeping | |
235 | related to process PID, if any; NULL otherwise. */ | |
236 | ||
237 | static struct thread_db_info * | |
238 | get_thread_db_info (int pid) | |
239 | { | |
240 | struct thread_db_info *info; | |
241 | ||
242 | for (info = thread_db_list; info; info = info->next) | |
243 | if (pid == info->pid) | |
244 | return info; | |
245 | ||
246 | return NULL; | |
247 | } | |
248 | ||
249 | /* When PID has exited or has been detached, we no longer want to keep | |
250 | track of it as using libpthread. Call this function to discard | |
251 | thread_db related info related to PID. Note that this closes | |
252 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
253 | ||
254 | static void | |
255 | delete_thread_db_info (int pid) | |
256 | { | |
257 | struct thread_db_info *info, *info_prev; | |
258 | ||
259 | info_prev = NULL; | |
260 | ||
261 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
262 | if (pid == info->pid) | |
263 | break; | |
264 | ||
265 | if (info == NULL) | |
266 | return; | |
267 | ||
268 | if (info->handle != NULL) | |
269 | dlclose (info->handle); | |
270 | ||
bf88dd68 JK |
271 | xfree (info->filename); |
272 | ||
d90e17a7 PA |
273 | if (info_prev) |
274 | info_prev->next = info->next; | |
275 | else | |
276 | thread_db_list = info->next; | |
277 | ||
278 | xfree (info); | |
279 | } | |
fb0e1ba7 MK |
280 | |
281 | /* Prototypes for local functions. */ | |
02c6c942 PP |
282 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
283 | const td_thrinfo_t *ti_p); | |
17faa917 | 284 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
285 | \f |
286 | ||
5365276c DJ |
287 | /* Use "struct private_thread_info" to cache thread state. This is |
288 | a substantial optimization. */ | |
289 | ||
fb0e1ba7 MK |
290 | struct private_thread_info |
291 | { | |
a2f23071 DJ |
292 | /* Flag set when we see a TD_DEATH event for this thread. */ |
293 | unsigned int dying:1; | |
294 | ||
5365276c | 295 | /* Cached thread state. */ |
5365276c | 296 | td_thrhandle_t th; |
17faa917 | 297 | thread_t tid; |
fb0e1ba7 | 298 | }; |
fb0e1ba7 | 299 | \f |
21bf60fe | 300 | |
fb0e1ba7 MK |
301 | static char * |
302 | thread_db_err_str (td_err_e err) | |
303 | { | |
304 | static char buf[64]; | |
305 | ||
306 | switch (err) | |
307 | { | |
308 | case TD_OK: | |
309 | return "generic 'call succeeded'"; | |
310 | case TD_ERR: | |
311 | return "generic error"; | |
312 | case TD_NOTHR: | |
313 | return "no thread to satisfy query"; | |
314 | case TD_NOSV: | |
315 | return "no sync handle to satisfy query"; | |
316 | case TD_NOLWP: | |
317 | return "no LWP to satisfy query"; | |
318 | case TD_BADPH: | |
319 | return "invalid process handle"; | |
320 | case TD_BADTH: | |
321 | return "invalid thread handle"; | |
322 | case TD_BADSH: | |
323 | return "invalid synchronization handle"; | |
324 | case TD_BADTA: | |
325 | return "invalid thread agent"; | |
326 | case TD_BADKEY: | |
327 | return "invalid key"; | |
328 | case TD_NOMSG: | |
329 | return "no event message for getmsg"; | |
330 | case TD_NOFPREGS: | |
331 | return "FPU register set not available"; | |
332 | case TD_NOLIBTHREAD: | |
333 | return "application not linked with libthread"; | |
334 | case TD_NOEVENT: | |
335 | return "requested event is not supported"; | |
336 | case TD_NOCAPAB: | |
337 | return "capability not available"; | |
338 | case TD_DBERR: | |
339 | return "debugger service failed"; | |
340 | case TD_NOAPLIC: | |
341 | return "operation not applicable to"; | |
342 | case TD_NOTSD: | |
343 | return "no thread-specific data for this thread"; | |
344 | case TD_MALLOC: | |
345 | return "malloc failed"; | |
346 | case TD_PARTIALREG: | |
347 | return "only part of register set was written/read"; | |
348 | case TD_NOXREGS: | |
349 | return "X register set not available for this thread"; | |
59f80f10 DJ |
350 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
351 | case TD_NOTALLOC: | |
352 | return "thread has not yet allocated TLS for given module"; | |
353 | #endif | |
354 | #ifdef THREAD_DB_HAS_TD_VERSION | |
355 | case TD_VERSION: | |
356 | return "versions of libpthread and libthread_db do not match"; | |
357 | #endif | |
358 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
359 | case TD_NOTLS: | |
360 | return "there is no TLS segment in the given module"; | |
361 | #endif | |
fb0e1ba7 MK |
362 | default: |
363 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
364 | return buf; | |
365 | } | |
366 | } | |
fb0e1ba7 | 367 | \f |
4105de34 DJ |
368 | /* Return 1 if any threads have been registered. There may be none if |
369 | the threading library is not fully initialized yet. */ | |
370 | ||
371 | static int | |
d90e17a7 | 372 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 373 | { |
d90e17a7 | 374 | int pid = * (int *) args; |
e0881a8e | 375 | |
d90e17a7 PA |
376 | if (ptid_get_pid (thread->ptid) != pid) |
377 | return 0; | |
378 | ||
e3bc4218 | 379 | return thread->private != NULL; |
4105de34 DJ |
380 | } |
381 | ||
382 | static int | |
d90e17a7 | 383 | have_threads (ptid_t ptid) |
4105de34 | 384 | { |
d90e17a7 PA |
385 | int pid = ptid_get_pid (ptid); |
386 | ||
387 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
388 | } |
389 | ||
d90e17a7 PA |
390 | struct thread_get_info_inout |
391 | { | |
392 | struct thread_info *thread_info; | |
393 | struct thread_db_info *thread_db_info; | |
394 | }; | |
395 | ||
5365276c | 396 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 397 | threads to LWPs. |
5365276c DJ |
398 | |
399 | THP is a handle to the current thread; if INFOP is not NULL, the | |
400 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
401 | *INFOP. |
402 | ||
403 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
404 | zero is returned to indicate success. */ | |
5365276c DJ |
405 | |
406 | static int | |
d90e17a7 | 407 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
408 | { |
409 | td_thrinfo_t ti; | |
410 | td_err_e err; | |
5365276c | 411 | ptid_t thread_ptid; |
d90e17a7 PA |
412 | struct thread_get_info_inout *inout; |
413 | struct thread_db_info *info; | |
414 | ||
415 | inout = argp; | |
416 | info = inout->thread_db_info; | |
5365276c | 417 | |
d90e17a7 | 418 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 419 | if (err != TD_OK) |
8a3fe4f8 | 420 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
421 | thread_db_err_str (err)); |
422 | ||
423 | /* Fill the cache. */ | |
d90e17a7 | 424 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 425 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 426 | |
d90e17a7 | 427 | if (inout->thread_info == NULL) |
5365276c DJ |
428 | { |
429 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
430 | if (!have_threads (thread_ptid)) |
431 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
432 | else |
433 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 434 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 435 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
436 | } |
437 | ||
5365276c DJ |
438 | return 0; |
439 | } | |
5365276c | 440 | \f |
64776a0b | 441 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 442 | |
64776a0b | 443 | static void |
39f77062 | 444 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 445 | { |
fb0e1ba7 MK |
446 | td_thrhandle_t th; |
447 | td_err_e err; | |
d90e17a7 PA |
448 | struct thread_db_info *info; |
449 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 450 | |
6cb9b55b PP |
451 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
452 | th.th_unique = 0; | |
453 | ||
17faa917 DJ |
454 | /* This ptid comes from linux-nat.c, which should always fill in the |
455 | LWP. */ | |
dfd4cc63 | 456 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 457 | |
dfd4cc63 | 458 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 459 | |
4c28f408 | 460 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 461 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
462 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
463 | &th); | |
fb0e1ba7 | 464 | if (err != TD_OK) |
8a3fe4f8 | 465 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 466 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 467 | |
64776a0b | 468 | /* Long-winded way of fetching the thread info. */ |
d90e17a7 PA |
469 | io.thread_db_info = info; |
470 | io.thread_info = NULL; | |
64776a0b | 471 | thread_get_info_callback (&th, &io); |
fb0e1ba7 MK |
472 | } |
473 | \f | |
474 | ||
4c28f408 PA |
475 | /* Attach to lwp PTID, doing whatever else is required to have this |
476 | LWP under the debugger's control --- e.g., enabling event | |
477 | reporting. Returns true on success. */ | |
478 | int | |
479 | thread_db_attach_lwp (ptid_t ptid) | |
480 | { | |
481 | td_thrhandle_t th; | |
482 | td_thrinfo_t ti; | |
483 | td_err_e err; | |
d90e17a7 | 484 | struct thread_db_info *info; |
4c28f408 | 485 | |
dfd4cc63 | 486 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
487 | |
488 | if (info == NULL) | |
4c28f408 PA |
489 | return 0; |
490 | ||
491 | /* This ptid comes from linux-nat.c, which should always fill in the | |
492 | LWP. */ | |
dfd4cc63 | 493 | gdb_assert (ptid_get_lwp (ptid) != 0); |
4c28f408 PA |
494 | |
495 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 496 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
497 | |
498 | /* If we have only looked at the first thread before libpthread was | |
499 | initialized, we may not know its thread ID yet. Make sure we do | |
500 | before we add another thread to the list. */ | |
d90e17a7 PA |
501 | if (!have_threads (ptid)) |
502 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 503 | |
dfd4cc63 LM |
504 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
505 | &th); | |
4c28f408 PA |
506 | if (err != TD_OK) |
507 | /* Cannot find user-level thread. */ | |
508 | return 0; | |
509 | ||
d90e17a7 | 510 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
511 | if (err != TD_OK) |
512 | { | |
513 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | attach_thread (ptid, &th, &ti); | |
518 | return 1; | |
519 | } | |
520 | ||
5220ea4c AC |
521 | static void * |
522 | verbose_dlsym (void *handle, const char *name) | |
523 | { | |
524 | void *sym = dlsym (handle, name); | |
525 | if (sym == NULL) | |
3e43a32a MS |
526 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
527 | name, dlerror ()); | |
5220ea4c AC |
528 | return sym; |
529 | } | |
530 | ||
cdbc0b18 | 531 | static td_err_e |
d90e17a7 | 532 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
533 | { |
534 | td_notify_t notify; | |
cdbc0b18 | 535 | td_err_e err; |
d90e17a7 PA |
536 | struct thread_db_info *info; |
537 | ||
dfd4cc63 | 538 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
24557e30 | 539 | |
4c28f408 | 540 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 541 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 542 | |
24557e30 | 543 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 544 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 545 | if (err != TD_OK) |
cdbc0b18 | 546 | return err; |
24557e30 AC |
547 | |
548 | /* Set up the breakpoint. */ | |
16451949 AS |
549 | gdb_assert (exec_bfd); |
550 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
f5656ead | 551 | (target_gdbarch (), |
16451949 AS |
552 | /* Do proper sign extension for the target. */ |
553 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
554 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
555 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
556 | ¤t_target)); | |
f5656ead | 557 | create_thread_event_breakpoint (target_gdbarch (), *bp); |
24557e30 | 558 | |
cdbc0b18 | 559 | return TD_OK; |
24557e30 AC |
560 | } |
561 | ||
fcb44371 JK |
562 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
563 | return 1 if this version is lower (and not equal) to | |
564 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
565 | ||
566 | static int | |
567 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
568 | { | |
3b7344d5 | 569 | struct bound_minimal_symbol version_msym; |
fcb44371 JK |
570 | CORE_ADDR version_addr; |
571 | char *version; | |
572 | int err, got, retval = 0; | |
573 | ||
574 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 575 | if (version_msym.minsym == NULL) |
fcb44371 JK |
576 | return 0; |
577 | ||
77e371c0 | 578 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 JK |
579 | got = target_read_string (version_addr, &version, 32, &err); |
580 | if (err == 0 && memchr (version, 0, got) == &version[got -1]) | |
581 | { | |
582 | int major, minor; | |
583 | ||
584 | retval = (sscanf (version, "%d.%d", &major, &minor) == 2 | |
585 | && (major < ver_major_min | |
586 | || (major == ver_major_min && minor < ver_minor_min))); | |
587 | } | |
588 | xfree (version); | |
589 | ||
590 | return retval; | |
591 | } | |
592 | ||
fb0e1ba7 MK |
593 | static void |
594 | enable_thread_event_reporting (void) | |
595 | { | |
596 | td_thr_events_t events; | |
fb0e1ba7 | 597 | td_err_e err; |
d90e17a7 PA |
598 | struct thread_db_info *info; |
599 | ||
dfd4cc63 | 600 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 MK |
601 | |
602 | /* We cannot use the thread event reporting facility if these | |
603 | functions aren't available. */ | |
d90e17a7 PA |
604 | if (info->td_ta_event_addr_p == NULL |
605 | || info->td_ta_set_event_p == NULL | |
606 | || info->td_ta_event_getmsg_p == NULL | |
607 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
608 | return; |
609 | ||
610 | /* Set the process wide mask saying which events we're interested in. */ | |
611 | td_event_emptyset (&events); | |
612 | td_event_addset (&events, TD_CREATE); | |
a2f23071 | 613 | |
8775fd2d JK |
614 | /* There is a bug fixed between linuxthreads 2.1.3 and 2.2 by |
615 | commit 2e4581e4fba917f1779cd0a010a45698586c190a | |
616 | * manager.c (pthread_exited): Correctly report event as TD_REAP | |
617 | instead of TD_DEATH. Fix comments. | |
618 | where event reporting facility is broken for TD_DEATH events, | |
619 | so don't enable it if we have glibc but a lower version. */ | |
620 | if (!inferior_has_bug ("__linuxthreads_version", 2, 2)) | |
a2f23071 | 621 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 622 | |
d90e17a7 | 623 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
624 | if (err != TD_OK) |
625 | { | |
8a3fe4f8 | 626 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
627 | thread_db_err_str (err)); |
628 | return; | |
629 | } | |
630 | ||
631 | /* Delete previous thread event breakpoints, if any. */ | |
632 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
633 | info->td_create_bp_addr = 0; |
634 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 635 | |
24557e30 | 636 | /* Set up the thread creation event. */ |
d90e17a7 | 637 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 638 | if (err != TD_OK) |
fb0e1ba7 | 639 | { |
8a3fe4f8 | 640 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
641 | thread_db_err_str (err)); |
642 | return; | |
643 | } | |
644 | ||
24557e30 | 645 | /* Set up the thread death event. */ |
d90e17a7 | 646 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 647 | if (err != TD_OK) |
fb0e1ba7 | 648 | { |
8a3fe4f8 | 649 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
650 | thread_db_err_str (err)); |
651 | return; | |
652 | } | |
fb0e1ba7 MK |
653 | } |
654 | ||
fcb44371 JK |
655 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
656 | if appropriate. | |
456b0e24 | 657 | |
fcb44371 JK |
658 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
659 | otherwise. */ | |
660 | ||
661 | static int | |
456b0e24 PP |
662 | thread_db_find_new_threads_silently (ptid_t ptid) |
663 | { | |
664 | volatile struct gdb_exception except; | |
665 | ||
666 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
667 | { | |
02c6c942 | 668 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
669 | } |
670 | ||
fcb44371 | 671 | if (except.reason < 0) |
e0881a8e | 672 | { |
fcb44371 JK |
673 | if (libthread_db_debug) |
674 | exception_fprintf (gdb_stderr, except, | |
675 | "Warning: thread_db_find_new_threads_silently: "); | |
676 | ||
677 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
678 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
679 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
680 | executables if td_thr_get_info is called before glibc has initialized | |
681 | itself. | |
682 | ||
683 | If the nptl bug is NOT present in the inferior and still thread_db | |
684 | reports an error return 1. It means the inferior has corrupted thread | |
685 | list and GDB should fall back only to LWPs. | |
686 | ||
687 | If the nptl bug is present in the inferior return 0 to silently ignore | |
688 | such errors, and let gdb enumerate threads again later. In such case | |
689 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
690 | corrupted. For core files it does not apply, no 'later enumeration' |
691 | is possible. */ | |
fcb44371 | 692 | |
889003ed | 693 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
694 | { |
695 | exception_fprintf (gdb_stderr, except, | |
696 | _("Warning: couldn't activate thread debugging " | |
697 | "using libthread_db: ")); | |
698 | return 1; | |
699 | } | |
e0881a8e | 700 | } |
fcb44371 | 701 | return 0; |
456b0e24 PP |
702 | } |
703 | ||
d90e17a7 PA |
704 | /* Lookup a library in which given symbol resides. |
705 | Note: this is looking in GDB process, not in the inferior. | |
706 | Returns library name, or NULL. */ | |
707 | ||
708 | static const char * | |
709 | dladdr_to_soname (const void *addr) | |
710 | { | |
711 | Dl_info info; | |
712 | ||
713 | if (dladdr (addr, &info) != 0) | |
714 | return info.dli_fname; | |
715 | return NULL; | |
716 | } | |
717 | ||
2471d008 | 718 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
719 | Return 1 on success. |
720 | Failure could happen if libthread_db does not have symbols we expect, | |
721 | or when it refuses to work with the current inferior (e.g. due to | |
722 | version mismatch between libthread_db and libpthread). */ | |
723 | ||
724 | static int | |
d90e17a7 | 725 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
726 | { |
727 | td_err_e err; | |
728 | ||
729 | /* Initialize pointers to the dynamic library functions we will use. | |
730 | Essential functions first. */ | |
731 | ||
d90e17a7 PA |
732 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
733 | if (info->td_init_p == NULL) | |
17a37d48 PP |
734 | return 0; |
735 | ||
d90e17a7 | 736 | err = info->td_init_p (); |
17a37d48 PP |
737 | if (err != TD_OK) |
738 | { | |
3e43a32a MS |
739 | warning (_("Cannot initialize libthread_db: %s"), |
740 | thread_db_err_str (err)); | |
17a37d48 PP |
741 | return 0; |
742 | } | |
743 | ||
d90e17a7 PA |
744 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
745 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
746 | return 0; |
747 | ||
748 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 749 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
750 | |
751 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 752 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
753 | if (err != TD_OK) |
754 | { | |
02d868e8 | 755 | if (libthread_db_debug) |
17a37d48 PP |
756 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
757 | thread_db_err_str (err)); | |
758 | else | |
759 | switch (err) | |
760 | { | |
761 | case TD_NOLIBTHREAD: | |
762 | #ifdef THREAD_DB_HAS_TD_VERSION | |
763 | case TD_VERSION: | |
764 | #endif | |
765 | /* The errors above are not unexpected and silently ignored: | |
766 | they just mean we haven't found correct version of | |
767 | libthread_db yet. */ | |
768 | break; | |
769 | default: | |
770 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
771 | } | |
772 | return 0; | |
773 | } | |
774 | ||
d90e17a7 PA |
775 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
776 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
777 | return 0; |
778 | ||
3e43a32a MS |
779 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
780 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 781 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
782 | return 0; |
783 | ||
d90e17a7 PA |
784 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
785 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
786 | return 0; |
787 | ||
d90e17a7 PA |
788 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
789 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
790 | return 0; |
791 | ||
d90e17a7 PA |
792 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
793 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
794 | return 0; |
795 | ||
796 | /* These are not essential. */ | |
d90e17a7 PA |
797 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
798 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 799 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
800 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
801 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
802 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
5876f503 | 803 | info->td_thr_tlsbase_p = dlsym (info->handle, "td_thr_tlsbase"); |
17a37d48 | 804 | |
fcb44371 JK |
805 | if (thread_db_find_new_threads_silently (inferior_ptid) != 0) |
806 | { | |
807 | /* Even if libthread_db initializes, if the thread list is | |
808 | corrupted, we'd not manage to list any threads. Better reject this | |
809 | thread_db, and fall back to at least listing LWPs. */ | |
810 | return 0; | |
811 | } | |
812 | ||
17a37d48 PP |
813 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
814 | ||
02d868e8 | 815 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
816 | { |
817 | const char *library; | |
17a37d48 | 818 | |
d90e17a7 PA |
819 | library = dladdr_to_soname (*info->td_ta_new_p); |
820 | if (library == NULL) | |
821 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 822 | |
d90e17a7 PA |
823 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
824 | library); | |
825 | } | |
17a37d48 | 826 | |
d90e17a7 PA |
827 | /* The thread library was detected. Activate the thread_db target |
828 | if this is the first process using it. */ | |
829 | if (thread_db_list->next == NULL) | |
830 | push_target (&thread_db_ops); | |
17a37d48 | 831 | |
856d6f99 PA |
832 | /* Enable event reporting, but not when debugging a core file. */ |
833 | if (target_has_execution) | |
834 | enable_thread_event_reporting (); | |
456b0e24 | 835 | |
d90e17a7 | 836 | return 1; |
17a37d48 PP |
837 | } |
838 | ||
839 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
840 | relative, or just LIBTHREAD_DB. */ | |
841 | ||
842 | static int | |
fde4f8ed | 843 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
844 | { |
845 | void *handle; | |
d90e17a7 | 846 | struct thread_db_info *info; |
17a37d48 | 847 | |
02d868e8 | 848 | if (libthread_db_debug) |
17a37d48 PP |
849 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
850 | library); | |
fde4f8ed JK |
851 | |
852 | if (check_auto_load_safe) | |
853 | { | |
854 | if (access (library, R_OK) != 0) | |
855 | { | |
856 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
857 | not exist at this place. */ | |
858 | if (libthread_db_debug) | |
859 | printf_unfiltered (_("open failed: %s.\n"), safe_strerror (errno)); | |
860 | return 0; | |
861 | } | |
862 | ||
863 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
864 | "library \"%s\" from explicit " | |
865 | "directory.\n"), | |
866 | library)) | |
867 | return 0; | |
868 | } | |
869 | ||
17a37d48 PP |
870 | handle = dlopen (library, RTLD_NOW); |
871 | if (handle == NULL) | |
872 | { | |
02d868e8 | 873 | if (libthread_db_debug) |
17a37d48 PP |
874 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
875 | return 0; | |
876 | } | |
877 | ||
02d868e8 | 878 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
879 | { |
880 | void *td_init; | |
881 | ||
882 | td_init = dlsym (handle, "td_init"); | |
883 | if (td_init != NULL) | |
884 | { | |
885 | const char *const libpath = dladdr_to_soname (td_init); | |
886 | ||
887 | if (libpath != NULL) | |
888 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
889 | library, libpath); | |
890 | } | |
891 | } | |
892 | ||
d90e17a7 PA |
893 | info = add_thread_db_info (handle); |
894 | ||
bf88dd68 JK |
895 | /* Do not save system library name, that one is always trusted. */ |
896 | if (strchr (library, '/') != NULL) | |
897 | info->filename = gdb_realpath (library); | |
898 | ||
d90e17a7 | 899 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
900 | return 1; |
901 | ||
902 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 903 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
904 | return 0; |
905 | } | |
906 | ||
290351b8 | 907 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
908 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
909 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
910 | The result is true for success. */ |
911 | ||
912 | static int | |
e6712ff1 | 913 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 914 | { |
05386e9e TT |
915 | struct cleanup *cleanup; |
916 | char *path, *cp; | |
917 | int result; | |
4262abfb | 918 | const char *obj_name = objfile_name (obj); |
290351b8 | 919 | |
4262abfb | 920 | if (obj_name[0] != '/') |
290351b8 DE |
921 | { |
922 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 923 | " inferior, but got %s."), obj_name); |
290351b8 DE |
924 | return 0; |
925 | } | |
05386e9e | 926 | |
4262abfb | 927 | path = xmalloc (strlen (obj_name) + (subdir ? strlen (subdir) + 1 : 0) |
e6712ff1 | 928 | + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
05386e9e TT |
929 | cleanup = make_cleanup (xfree, path); |
930 | ||
4262abfb | 931 | strcpy (path, obj_name); |
05386e9e TT |
932 | cp = strrchr (path, '/'); |
933 | /* This should at minimum hit the first character. */ | |
934 | gdb_assert (cp != NULL); | |
e6712ff1 DE |
935 | cp[1] = '\0'; |
936 | if (subdir != NULL) | |
937 | { | |
938 | strcat (cp, subdir); | |
939 | strcat (cp, "/"); | |
940 | } | |
941 | strcat (cp, LIBTHREAD_DB_SO); | |
bccbefd2 | 942 | |
fde4f8ed | 943 | result = try_thread_db_load (path, 1); |
05386e9e TT |
944 | |
945 | do_cleanups (cleanup); | |
946 | return result; | |
290351b8 DE |
947 | } |
948 | ||
98a5dd13 | 949 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
950 | Look for libthread_db in directory(libpthread)/SUBDIR. |
951 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
952 | The result is true for success. */ |
953 | ||
954 | static int | |
e6712ff1 | 955 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
956 | { |
957 | struct objfile *obj; | |
958 | ||
bf88dd68 JK |
959 | if (!auto_load_thread_db) |
960 | return 0; | |
961 | ||
98a5dd13 | 962 | ALL_OBJFILES (obj) |
4262abfb | 963 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 964 | { |
e6712ff1 | 965 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
966 | return 1; |
967 | ||
968 | /* We may have found the separate-debug-info version of | |
969 | libpthread, and it may live in a directory without a matching | |
970 | libthread_db. */ | |
971 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
972 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
973 | subdir); | |
290351b8 | 974 | |
98a5dd13 DE |
975 | return 0; |
976 | } | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | /* Handle $sdir in libthread-db-search-path. | |
982 | Look for libthread_db in the system dirs, or wherever a plain | |
983 | dlopen(file_without_path) will look. | |
984 | The result is true for success. */ | |
985 | ||
986 | static int | |
987 | try_thread_db_load_from_sdir (void) | |
988 | { | |
fde4f8ed | 989 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
990 | } |
991 | ||
992 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
993 | The result is true for success. */ | |
994 | ||
995 | static int | |
996 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
997 | { | |
05386e9e TT |
998 | struct cleanup *cleanup; |
999 | char *path; | |
1000 | int result; | |
98a5dd13 | 1001 | |
bf88dd68 JK |
1002 | if (!auto_load_thread_db) |
1003 | return 0; | |
1004 | ||
05386e9e TT |
1005 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
1006 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
1007 | |
1008 | memcpy (path, dir, dir_len); | |
1009 | path[dir_len] = '/'; | |
1010 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
bccbefd2 | 1011 | |
fde4f8ed | 1012 | result = try_thread_db_load (path, 1); |
05386e9e TT |
1013 | |
1014 | do_cleanups (cleanup); | |
1015 | return result; | |
98a5dd13 DE |
1016 | } |
1017 | ||
17a37d48 | 1018 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1019 | to work on current inferior. |
1020 | The result is true for success. */ | |
17a37d48 PP |
1021 | |
1022 | static int | |
1023 | thread_db_load_search (void) | |
1024 | { | |
e6712ff1 DE |
1025 | VEC (char_ptr) *dir_vec; |
1026 | struct cleanup *cleanups; | |
1027 | char *this_dir; | |
1028 | int i, rc = 0; | |
17a37d48 | 1029 | |
e6712ff1 DE |
1030 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
1031 | cleanups = make_cleanup_free_char_ptr_vec (dir_vec); | |
1032 | ||
1033 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
17a37d48 | 1034 | { |
e6712ff1 | 1035 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1036 | size_t this_dir_len; |
e0881a8e | 1037 | |
e6712ff1 | 1038 | this_dir_len = strlen (this_dir); |
17a37d48 | 1039 | |
e6712ff1 DE |
1040 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1041 | && (this_dir[pdir_len] == '\0' | |
1042 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1043 | { |
e6712ff1 | 1044 | char *subdir = NULL; |
1fc3cf4a TT |
1045 | struct cleanup *free_subdir_cleanup |
1046 | = make_cleanup (null_cleanup, NULL); | |
e6712ff1 DE |
1047 | |
1048 | if (this_dir[pdir_len] == '/') | |
98a5dd13 | 1049 | { |
e6712ff1 | 1050 | subdir = xmalloc (strlen (this_dir)); |
1fc3cf4a | 1051 | make_cleanup (xfree, subdir); |
e6712ff1 | 1052 | strcpy (subdir, this_dir + pdir_len + 1); |
98a5dd13 | 1053 | } |
e6712ff1 | 1054 | rc = try_thread_db_load_from_pdir (subdir); |
1fc3cf4a | 1055 | do_cleanups (free_subdir_cleanup); |
e6712ff1 DE |
1056 | if (rc) |
1057 | break; | |
17a37d48 | 1058 | } |
e6712ff1 | 1059 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1060 | { |
1061 | if (try_thread_db_load_from_sdir ()) | |
1062 | { | |
1063 | rc = 1; | |
1064 | break; | |
1065 | } | |
1066 | } | |
1067 | else | |
17a37d48 | 1068 | { |
98a5dd13 DE |
1069 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1070 | { | |
1071 | rc = 1; | |
1072 | break; | |
1073 | } | |
17a37d48 PP |
1074 | } |
1075 | } | |
98a5dd13 | 1076 | |
e6712ff1 | 1077 | do_cleanups (cleanups); |
98a5dd13 DE |
1078 | if (libthread_db_debug) |
1079 | printf_unfiltered (_("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1080 | return rc; |
1081 | } | |
1082 | ||
98a5dd13 DE |
1083 | /* Return non-zero if the inferior has a libpthread. */ |
1084 | ||
1085 | static int | |
1086 | has_libpthread (void) | |
1087 | { | |
1088 | struct objfile *obj; | |
1089 | ||
1090 | ALL_OBJFILES (obj) | |
4262abfb | 1091 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
1092 | return 1; |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
17a37d48 | 1097 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1098 | Return 1 on success. */ |
17a37d48 PP |
1099 | |
1100 | static int | |
1101 | thread_db_load (void) | |
1102 | { | |
d90e17a7 | 1103 | struct thread_db_info *info; |
17a37d48 | 1104 | |
dfd4cc63 | 1105 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
1106 | |
1107 | if (info != NULL) | |
17a37d48 PP |
1108 | return 1; |
1109 | ||
856d6f99 PA |
1110 | /* Don't attempt to use thread_db on executables not running |
1111 | yet. */ | |
1112 | if (!target_has_registers) | |
17a37d48 PP |
1113 | return 0; |
1114 | ||
1115 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1116 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1117 | return 0; |
1118 | ||
1119 | if (thread_db_load_search ()) | |
1120 | return 1; | |
1121 | ||
98a5dd13 DE |
1122 | /* We couldn't find a libthread_db. |
1123 | If the inferior has a libpthread warn the user. */ | |
1124 | if (has_libpthread ()) | |
1125 | { | |
1126 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1127 | " library, thread debugging will not be available.")); | |
1128 | return 0; | |
17a37d48 | 1129 | } |
98a5dd13 | 1130 | |
17a37d48 PP |
1131 | /* Either this executable isn't using libpthread at all, or it is |
1132 | statically linked. Since we can't easily distinguish these two cases, | |
1133 | no warning is issued. */ | |
1134 | return 0; | |
1135 | } | |
1136 | ||
fb0e1ba7 | 1137 | static void |
12b6a110 | 1138 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1139 | { |
21e1bee4 | 1140 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1141 | { |
1142 | td_thr_events_t events; | |
fb0e1ba7 | 1143 | |
12b6a110 PP |
1144 | /* Set the process wide mask saying we aren't interested in any |
1145 | events anymore. */ | |
21e1bee4 PP |
1146 | td_event_fillset (&events); |
1147 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1148 | } |
fb0e1ba7 | 1149 | |
d90e17a7 PA |
1150 | info->td_create_bp_addr = 0; |
1151 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1152 | } |
1153 | ||
1154 | static void | |
1155 | check_thread_signals (void) | |
1156 | { | |
21bf60fe | 1157 | if (!thread_signals) |
fb0e1ba7 MK |
1158 | { |
1159 | sigset_t mask; | |
1160 | int i; | |
1161 | ||
669211f5 | 1162 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1163 | sigemptyset (&thread_stop_set); |
1164 | sigemptyset (&thread_print_set); | |
1165 | ||
b9569773 | 1166 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1167 | { |
1168 | if (sigismember (&mask, i)) | |
1169 | { | |
2ea28649 | 1170 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1171 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1172 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1173 | sigaddset (&thread_print_set, i); |
1174 | thread_signals = 1; | |
1175 | } | |
1176 | } | |
1177 | } | |
fb0e1ba7 MK |
1178 | } |
1179 | ||
0ec9a092 DJ |
1180 | /* Check whether thread_db is usable. This function is called when |
1181 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1182 | and when new shared libraries are loaded into a running process. */ | |
1183 | ||
1184 | void | |
1185 | check_for_thread_db (void) | |
fb0e1ba7 | 1186 | { |
b5057acd | 1187 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1188 | if (!thread_db_load ()) |
b5057acd | 1189 | return; |
0ec9a092 DJ |
1190 | } |
1191 | ||
0838fb57 DE |
1192 | /* This function is called via the new_objfile observer. */ |
1193 | ||
0ec9a092 DJ |
1194 | static void |
1195 | thread_db_new_objfile (struct objfile *objfile) | |
1196 | { | |
d90e17a7 PA |
1197 | /* This observer must always be called with inferior_ptid set |
1198 | correctly. */ | |
1199 | ||
0838fb57 | 1200 | if (objfile != NULL |
fcb44371 | 1201 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1202 | loaded (and notified without successful thread_db initialization) |
fcb44371 JK |
1203 | the time observer_notify_new_objfile is called for the library itself. |
1204 | Static executables have their separate debug info loaded already | |
1205 | before the inferior has started. */ | |
1206 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1207 | /* Only check for thread_db if we loaded libpthread, |
1208 | or if this is the main symbol file. | |
1209 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1210 | a statically linked executable AND the symbol file is specified AFTER | |
1211 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1212 | For dynamically linked executables, libpthread can be near the end | |
1213 | of the list of shared libraries to load, and in an app of several | |
1214 | thousand shared libraries, this can otherwise be painful. */ | |
1215 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1216 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1217 | check_for_thread_db (); |
fb0e1ba7 MK |
1218 | } |
1219 | ||
0838fb57 DE |
1220 | /* This function is called via the inferior_created observer. |
1221 | This handles the case of debugging statically linked executables. */ | |
1222 | ||
1223 | static void | |
1224 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1225 | { | |
1226 | check_for_thread_db (); | |
1227 | } | |
1228 | ||
a2f23071 DJ |
1229 | /* Attach to a new thread. This function is called when we receive a |
1230 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1231 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1232 | |
02c6c942 | 1233 | static int |
39f77062 | 1234 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1235 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1236 | { |
17faa917 | 1237 | struct private_thread_info *private; |
2a2ef594 | 1238 | struct thread_info *tp; |
fb0e1ba7 | 1239 | td_err_e err; |
d90e17a7 | 1240 | struct thread_db_info *info; |
fb0e1ba7 | 1241 | |
a2f23071 DJ |
1242 | /* If we're being called after a TD_CREATE event, we may already |
1243 | know about this thread. There are two ways this can happen. We | |
1244 | may have iterated over all threads between the thread creation | |
1245 | and the TD_CREATE event, for instance when the user has issued | |
1246 | the `info threads' command before the SIGTRAP for hitting the | |
1247 | thread creation breakpoint was reported. Alternatively, the | |
1248 | thread may have exited and a new one been created with the same | |
1249 | thread ID. In the first case we don't need to do anything; in | |
1250 | the second case we should discard information about the dead | |
1251 | thread and attach to the new one. */ | |
2a2ef594 PA |
1252 | tp = find_thread_ptid (ptid); |
1253 | if (tp != NULL) | |
a2f23071 | 1254 | { |
17faa917 DJ |
1255 | /* If tp->private is NULL, then GDB is already attached to this |
1256 | thread, but we do not know anything about it. We can learn | |
1257 | about it here. This can only happen if we have some other | |
1258 | way besides libthread_db to notice new threads (i.e. | |
1259 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1260 | exit, so this can not be a stale thread recreated with the | |
1261 | same ID. */ | |
1262 | if (tp->private != NULL) | |
1263 | { | |
1264 | if (!tp->private->dying) | |
02c6c942 | 1265 | return 0; |
a2f23071 | 1266 | |
17faa917 DJ |
1267 | delete_thread (ptid); |
1268 | tp = NULL; | |
1269 | } | |
a2f23071 DJ |
1270 | } |
1271 | ||
856d6f99 PA |
1272 | if (target_has_execution) |
1273 | check_thread_signals (); | |
fb0e1ba7 | 1274 | |
9ee57c33 | 1275 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
856d6f99 | 1276 | if (target_has_execution |
84636d28 PA |
1277 | && tp == NULL) |
1278 | { | |
1279 | int res; | |
1280 | ||
dfd4cc63 LM |
1281 | res = lin_lwp_attach_lwp (ptid_build (ptid_get_pid (ptid), |
1282 | ti_p->ti_lid, 0)); | |
84636d28 PA |
1283 | if (res < 0) |
1284 | { | |
1285 | /* Error, stop iterating. */ | |
1286 | return 0; | |
1287 | } | |
1288 | else if (res > 0) | |
1289 | { | |
1290 | /* Pretend this thread doesn't exist yet, and keep | |
1291 | iterating. */ | |
1292 | return 1; | |
1293 | } | |
1294 | ||
1295 | /* Otherwise, we sucessfully attached to the thread. */ | |
1296 | } | |
9ee57c33 | 1297 | |
17faa917 DJ |
1298 | /* Construct the thread's private data. */ |
1299 | private = xmalloc (sizeof (struct private_thread_info)); | |
1300 | memset (private, 0, sizeof (struct private_thread_info)); | |
1301 | ||
1302 | /* A thread ID of zero may mean the thread library has not initialized | |
1303 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1304 | if we change GDB to always have at least one thread in the thread | |
1305 | list this will have to go somewhere else; maybe private == NULL | |
1306 | until the thread_db target claims it. */ | |
1307 | gdb_assert (ti_p->ti_tid != 0); | |
1308 | private->th = *th_p; | |
1309 | private->tid = ti_p->ti_tid; | |
64776a0b PA |
1310 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
1311 | private->dying = 1; | |
17faa917 | 1312 | |
fb0e1ba7 | 1313 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1314 | if (tp == NULL) |
2e456570 | 1315 | add_thread_with_info (ptid, private); |
17faa917 DJ |
1316 | else |
1317 | tp->private = private; | |
5365276c | 1318 | |
dfd4cc63 | 1319 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1320 | |
856d6f99 PA |
1321 | /* Enable thread event reporting for this thread, except when |
1322 | debugging a core file. */ | |
1323 | if (target_has_execution) | |
1324 | { | |
1325 | err = info->td_thr_event_enable_p (th_p, 1); | |
1326 | if (err != TD_OK) | |
1327 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1328 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1329 | } | |
1330 | ||
02c6c942 | 1331 | return 1; |
fb0e1ba7 MK |
1332 | } |
1333 | ||
1334 | static void | |
17faa917 | 1335 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1336 | { |
a2f23071 DJ |
1337 | struct thread_info *thread_info; |
1338 | ||
a2f23071 DJ |
1339 | /* Don't delete the thread now, because it still reports as active |
1340 | until it has executed a few instructions after the event | |
1341 | breakpoint - if we deleted it now, "info threads" would cause us | |
1342 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1343 | event. This means that we won't delete it from our thread list | |
1344 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1345 | something re-uses its thread ID. We'll report the thread exit |
1346 | when the underlying LWP dies. */ | |
e09875d4 | 1347 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1348 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1349 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1350 | } |
1351 | ||
1352 | static void | |
52554a0e | 1353 | thread_db_detach (struct target_ops *ops, const char *args, int from_tty) |
fb0e1ba7 | 1354 | { |
117de6a9 | 1355 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1356 | struct thread_db_info *info; |
117de6a9 | 1357 | |
dfd4cc63 | 1358 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
c194fbe1 | 1359 | |
d90e17a7 PA |
1360 | if (info) |
1361 | { | |
856d6f99 PA |
1362 | if (target_has_execution) |
1363 | { | |
1364 | disable_thread_event_reporting (info); | |
1365 | ||
1366 | /* Delete the old thread event breakpoints. Note that | |
1367 | unlike when mourning, we can remove them here because | |
1368 | there's still a live inferior to poke at. In any case, | |
1369 | GDB will not try to insert anything in the inferior when | |
1370 | removing a breakpoint. */ | |
1371 | remove_thread_event_breakpoints (); | |
1372 | } | |
d90e17a7 | 1373 | |
dfd4cc63 | 1374 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 | 1375 | } |
4105de34 | 1376 | |
7a7d3353 | 1377 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1378 | |
1379 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1380 | ||
1381 | /* If there are no more processes using libpthread, detach the | |
1382 | thread_db target ops. */ | |
1383 | if (!thread_db_list) | |
1384 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1385 | } |
1386 | ||
fb0e1ba7 MK |
1387 | /* Check if PID is currently stopped at the location of a thread event |
1388 | breakpoint location. If it is, read the event message and act upon | |
1389 | the event. */ | |
1390 | ||
1391 | static void | |
39f77062 | 1392 | check_event (ptid_t ptid) |
fb0e1ba7 | 1393 | { |
515630c5 UW |
1394 | struct regcache *regcache = get_thread_regcache (ptid); |
1395 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1396 | td_event_msg_t msg; |
1397 | td_thrinfo_t ti; | |
1398 | td_err_e err; | |
1399 | CORE_ADDR stop_pc; | |
4d9850d3 | 1400 | int loop = 0; |
d90e17a7 PA |
1401 | struct thread_db_info *info; |
1402 | ||
dfd4cc63 | 1403 | info = get_thread_db_info (ptid_get_pid (ptid)); |
fb0e1ba7 MK |
1404 | |
1405 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 | 1406 | stop_pc = regcache_read_pc (regcache) |
118e6252 | 1407 | - target_decr_pc_after_break (gdbarch); |
d90e17a7 PA |
1408 | if (stop_pc != info->td_create_bp_addr |
1409 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1410 | return; |
1411 | ||
4c28f408 | 1412 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1413 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1414 | |
1415 | /* If we have only looked at the first thread before libpthread was | |
1416 | initialized, we may not know its thread ID yet. Make sure we do | |
1417 | before we add another thread to the list. */ | |
d90e17a7 PA |
1418 | if (!have_threads (ptid)) |
1419 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1420 | |
4d9850d3 JJ |
1421 | /* If we are at a create breakpoint, we do not know what new lwp |
1422 | was created and cannot specifically locate the event message for it. | |
1423 | We have to call td_ta_event_getmsg() to get | |
1424 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1425 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1426 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1427 | This guarantees we will process the correct message before continuing |
1428 | from the breakpoint. | |
4d9850d3 JJ |
1429 | |
1430 | Currently, death events are not enabled. If they are enabled, | |
1431 | the death event can use the td_thr_event_getmsg() interface to | |
1432 | get the message specifically for that lwp and avoid looping | |
1433 | below. */ | |
1434 | ||
1435 | loop = 1; | |
1436 | ||
1437 | do | |
fb0e1ba7 | 1438 | { |
d90e17a7 | 1439 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1440 | if (err != TD_OK) |
1441 | { | |
1442 | if (err == TD_NOMSG) | |
1443 | return; | |
fb0e1ba7 | 1444 | |
8a3fe4f8 | 1445 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1446 | thread_db_err_str (err)); |
1447 | } | |
fb0e1ba7 | 1448 | |
d90e17a7 | 1449 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1450 | if (err != TD_OK) |
8a3fe4f8 | 1451 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1452 | |
dfd4cc63 | 1453 | ptid = ptid_build (ptid_get_pid (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1454 | |
4d9850d3 JJ |
1455 | switch (msg.event) |
1456 | { | |
1457 | case TD_CREATE: | |
a2f23071 DJ |
1458 | /* Call attach_thread whether or not we already know about a |
1459 | thread with this thread ID. */ | |
93815fbf | 1460 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1461 | |
4d9850d3 | 1462 | break; |
fb0e1ba7 | 1463 | |
4d9850d3 | 1464 | case TD_DEATH: |
fb0e1ba7 | 1465 | |
4d9850d3 | 1466 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1467 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1468 | |
17faa917 | 1469 | detach_thread (ptid); |
fb0e1ba7 | 1470 | |
4d9850d3 | 1471 | break; |
fb0e1ba7 | 1472 | |
4d9850d3 | 1473 | default: |
8a3fe4f8 | 1474 | error (_("Spurious thread event.")); |
4d9850d3 | 1475 | } |
fb0e1ba7 | 1476 | } |
4d9850d3 | 1477 | while (loop); |
fb0e1ba7 MK |
1478 | } |
1479 | ||
39f77062 | 1480 | static ptid_t |
117de6a9 | 1481 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1482 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1483 | int options) | |
fb0e1ba7 | 1484 | { |
d90e17a7 | 1485 | struct thread_db_info *info; |
117de6a9 PA |
1486 | struct target_ops *beneath = find_target_beneath (ops); |
1487 | ||
47608cb1 | 1488 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1489 | |
b84876c2 PA |
1490 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1491 | return ptid; | |
1492 | ||
1111f4aa | 1493 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1494 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1495 | return ptid; | |
fb0e1ba7 | 1496 | |
dfd4cc63 | 1497 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1498 | |
1499 | /* If this process isn't using thread_db, we're done. */ | |
1500 | if (info == NULL) | |
1501 | return ptid; | |
1502 | ||
3f64f7b1 DJ |
1503 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1504 | { | |
d90e17a7 PA |
1505 | /* New image, it may or may not end up using thread_db. Assume |
1506 | not unless we find otherwise. */ | |
dfd4cc63 | 1507 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1508 | if (!thread_db_list) |
1509 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1510 | |
6c95b8df PA |
1511 | /* Thread event breakpoints are deleted by |
1512 | update_breakpoints_after_exec. */ | |
1513 | ||
49fd4a42 | 1514 | return ptid; |
3f64f7b1 DJ |
1515 | } |
1516 | ||
4105de34 DJ |
1517 | /* If we do not know about the main thread yet, this would be a good time to |
1518 | find it. */ | |
d90e17a7 PA |
1519 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1520 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1521 | |
fb0e1ba7 | 1522 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
a493e3e2 | 1523 | && ourstatus->value.sig == GDB_SIGNAL_TRAP) |
fb0e1ba7 | 1524 | /* Check for a thread event. */ |
39f77062 | 1525 | check_event (ptid); |
fb0e1ba7 | 1526 | |
d90e17a7 | 1527 | if (have_threads (ptid)) |
4105de34 | 1528 | { |
64776a0b PA |
1529 | /* Fill in the thread's user-level thread id. */ |
1530 | thread_from_lwp (ptid); | |
4105de34 | 1531 | } |
fb0e1ba7 | 1532 | |
b9b5d7ea | 1533 | return ptid; |
fb0e1ba7 MK |
1534 | } |
1535 | ||
fb0e1ba7 | 1536 | static void |
136d6dae | 1537 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1538 | { |
117de6a9 PA |
1539 | struct target_ops *target_beneath = find_target_beneath (ops); |
1540 | ||
dfd4cc63 | 1541 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1542 | |
d90e17a7 PA |
1543 | target_beneath->to_mourn_inferior (target_beneath); |
1544 | ||
6c95b8df PA |
1545 | /* Delete the old thread event breakpoints. Do this after mourning |
1546 | the inferior, so that we don't try to uninsert them. */ | |
1547 | remove_thread_event_breakpoints (); | |
1548 | ||
b26a6851 | 1549 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1550 | if (!thread_db_list) |
1551 | unpush_target (ops); | |
fb0e1ba7 MK |
1552 | } |
1553 | ||
02c6c942 PP |
1554 | struct callback_data |
1555 | { | |
1556 | struct thread_db_info *info; | |
1557 | int new_threads; | |
1558 | }; | |
1559 | ||
fb0e1ba7 MK |
1560 | static int |
1561 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1562 | { | |
1563 | td_thrinfo_t ti; | |
1564 | td_err_e err; | |
39f77062 | 1565 | ptid_t ptid; |
403fe197 | 1566 | struct thread_info *tp; |
02c6c942 PP |
1567 | struct callback_data *cb_data = data; |
1568 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1569 | |
d90e17a7 | 1570 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1571 | if (err != TD_OK) |
8a3fe4f8 | 1572 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1573 | thread_db_err_str (err)); |
fb0e1ba7 | 1574 | |
254f582e | 1575 | if (ti.ti_tid == 0) |
4105de34 DJ |
1576 | { |
1577 | /* A thread ID of zero means that this is the main thread, but | |
1578 | glibc has not yet initialized thread-local storage and the | |
1579 | pthread library. We do not know what the thread's TID will | |
1580 | be yet. Just enable event reporting and otherwise ignore | |
1581 | it. */ | |
1582 | ||
4d062f1a PA |
1583 | /* In that case, we're not stopped in a fork syscall and don't |
1584 | need this glibc bug workaround. */ | |
1585 | info->need_stale_parent_threads_check = 0; | |
1586 | ||
254f582e JK |
1587 | if (target_has_execution) |
1588 | { | |
1589 | err = info->td_thr_event_enable_p (th_p, 1); | |
1590 | if (err != TD_OK) | |
1591 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1592 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1593 | } | |
4105de34 DJ |
1594 | |
1595 | return 0; | |
1596 | } | |
1597 | ||
4d062f1a PA |
1598 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1599 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1600 | avoid doing the work if we know we don't have to. */ | |
1601 | if (info->need_stale_parent_threads_check) | |
1602 | { | |
1603 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1604 | |
4d062f1a PA |
1605 | if (tgid != -1 && tgid != info->pid) |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1610 | tp = find_thread_ptid (ptid); |
403fe197 | 1611 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1612 | { |
1613 | if (attach_thread (ptid, th_p, &ti)) | |
1614 | cb_data->new_threads += 1; | |
1615 | else | |
1616 | /* Problem attaching this thread; perhaps it exited before we | |
1617 | could attach it? | |
1618 | This could mean that the thread list inside glibc itself is in | |
1619 | inconsistent state, and libthread_db could go on looping forever | |
1620 | (observed with glibc-2.3.6). To prevent that, terminate | |
1621 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1622 | return 1; | |
1623 | } | |
fb0e1ba7 MK |
1624 | |
1625 | return 0; | |
1626 | } | |
1627 | ||
02c6c942 PP |
1628 | /* Helper for thread_db_find_new_threads_2. |
1629 | Returns number of new threads found. */ | |
1630 | ||
1631 | static int | |
1632 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1633 | td_err_e *errp) |
02c6c942 PP |
1634 | { |
1635 | volatile struct gdb_exception except; | |
1636 | struct callback_data data; | |
fb169834 | 1637 | td_err_e err = TD_ERR; |
02c6c942 PP |
1638 | |
1639 | data.info = info; | |
1640 | data.new_threads = 0; | |
1641 | ||
1642 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1643 | { | |
1644 | /* Iterate over all user-space threads to discover new threads. */ | |
1645 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1646 | find_new_threads_callback, | |
1647 | &data, | |
1648 | TD_THR_ANY_STATE, | |
1649 | TD_THR_LOWEST_PRIORITY, | |
1650 | TD_SIGNO_MASK, | |
1651 | TD_THR_ANY_USER_FLAGS); | |
1652 | } | |
1653 | ||
02d868e8 | 1654 | if (libthread_db_debug) |
02c6c942 PP |
1655 | { |
1656 | if (except.reason < 0) | |
1657 | exception_fprintf (gdb_stderr, except, | |
1658 | "Warning: find_new_threads_once: "); | |
1659 | ||
1660 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1661 | data.new_threads, iteration); | |
1662 | } | |
1663 | ||
1664 | if (errp != NULL) | |
1665 | *errp = err; | |
1666 | ||
1667 | return data.new_threads; | |
1668 | } | |
1669 | ||
4c28f408 | 1670 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1671 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1672 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1673 | |
fb0e1ba7 | 1674 | static void |
02c6c942 | 1675 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1676 | { |
fcb44371 | 1677 | td_err_e err = TD_OK; |
d90e17a7 | 1678 | struct thread_db_info *info; |
02c6c942 | 1679 | int i, loop; |
4c28f408 | 1680 | |
dfd4cc63 | 1681 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1682 | |
4c28f408 | 1683 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1684 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1685 | |
1686 | if (until_no_new) | |
1687 | { | |
1688 | /* Require 4 successive iterations which do not find any new threads. | |
1689 | The 4 is a heuristic: there is an inherent race here, and I have | |
1690 | seen that 2 iterations in a row are not always sufficient to | |
1691 | "capture" all threads. */ | |
fcb44371 JK |
1692 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1693 | if (find_new_threads_once (info, i, &err) != 0) | |
1694 | { | |
1695 | /* Found some new threads. Restart the loop from beginning. */ | |
1696 | loop = -1; | |
1697 | } | |
02c6c942 PP |
1698 | } |
1699 | else | |
fcb44371 JK |
1700 | find_new_threads_once (info, 0, &err); |
1701 | ||
1702 | if (err != TD_OK) | |
1703 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1704 | } |
1705 | ||
02c6c942 PP |
1706 | static void |
1707 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1708 | { | |
1709 | thread_db_find_new_threads_2 (ptid, 0); | |
1710 | } | |
1711 | ||
dc146f7c VP |
1712 | static int |
1713 | update_thread_core (struct lwp_info *info, void *closure) | |
1714 | { | |
2e794194 | 1715 | info->core = linux_common_core_of_thread (info->ptid); |
dc146f7c VP |
1716 | return 0; |
1717 | } | |
02c6c942 | 1718 | |
28439f5e | 1719 | static void |
e8032dde | 1720 | thread_db_update_thread_list (struct target_ops *ops) |
28439f5e | 1721 | { |
d90e17a7 | 1722 | struct thread_db_info *info; |
c65b3e0d | 1723 | struct inferior *inf; |
d90e17a7 | 1724 | |
e8032dde PA |
1725 | prune_threads (); |
1726 | ||
c65b3e0d PA |
1727 | ALL_INFERIORS (inf) |
1728 | { | |
1729 | struct thread_info *thread; | |
d90e17a7 | 1730 | |
c65b3e0d PA |
1731 | if (inf->pid == 0) |
1732 | continue; | |
d90e17a7 | 1733 | |
c65b3e0d PA |
1734 | info = get_thread_db_info (inf->pid); |
1735 | if (info == NULL) | |
1736 | continue; | |
1737 | ||
1738 | thread = any_live_thread_of_process (inf->pid); | |
1739 | if (thread == NULL || thread->executing) | |
1740 | continue; | |
1741 | ||
1742 | thread_db_find_new_threads_1 (thread->ptid); | |
1743 | } | |
dc146f7c | 1744 | |
856d6f99 PA |
1745 | if (target_has_execution) |
1746 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1747 | update_thread_core, NULL); | |
28439f5e PA |
1748 | } |
1749 | ||
fb0e1ba7 | 1750 | static char * |
117de6a9 | 1751 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1752 | { |
e09875d4 | 1753 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1754 | struct target_ops *beneath; |
17faa917 DJ |
1755 | |
1756 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1757 | { |
1758 | static char buf[64]; | |
17faa917 | 1759 | thread_t tid; |
fb0e1ba7 | 1760 | |
17faa917 | 1761 | tid = thread_info->private->tid; |
17faa917 | 1762 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
dfd4cc63 | 1763 | tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1764 | |
1765 | return buf; | |
1766 | } | |
1767 | ||
117de6a9 | 1768 | beneath = find_target_beneath (ops); |
e75fdfca | 1769 | return beneath->to_pid_to_str (beneath, ptid); |
fb0e1ba7 MK |
1770 | } |
1771 | ||
28b17333 DJ |
1772 | /* Return a string describing the state of the thread specified by |
1773 | INFO. */ | |
1774 | ||
1775 | static char * | |
c15906d8 TT |
1776 | thread_db_extra_thread_info (struct target_ops *self, |
1777 | struct thread_info *info) | |
28b17333 | 1778 | { |
17faa917 DJ |
1779 | if (info->private == NULL) |
1780 | return NULL; | |
1781 | ||
28b17333 DJ |
1782 | if (info->private->dying) |
1783 | return "Exiting"; | |
1784 | ||
1785 | return NULL; | |
1786 | } | |
1787 | ||
b2756930 KB |
1788 | /* Get the address of the thread local variable in load module LM which |
1789 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1790 | |
1791 | static CORE_ADDR | |
117de6a9 PA |
1792 | thread_db_get_thread_local_address (struct target_ops *ops, |
1793 | ptid_t ptid, | |
b2756930 | 1794 | CORE_ADDR lm, |
b4acd559 | 1795 | CORE_ADDR offset) |
3f47be5c | 1796 | { |
17faa917 | 1797 | struct thread_info *thread_info; |
117de6a9 | 1798 | struct target_ops *beneath; |
17faa917 | 1799 | |
4105de34 | 1800 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1801 | if (!have_threads (ptid)) |
1802 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1803 | |
17faa917 | 1804 | /* Find the matching thread. */ |
e09875d4 | 1805 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1806 | |
17faa917 | 1807 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1808 | { |
3f47be5c | 1809 | td_err_e err; |
00f515da | 1810 | psaddr_t address; |
d90e17a7 PA |
1811 | struct thread_db_info *info; |
1812 | ||
dfd4cc63 | 1813 | info = get_thread_db_info (ptid_get_pid (ptid)); |
3f47be5c | 1814 | |
3f47be5c | 1815 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1816 | if (lm != 0) |
1817 | { | |
1818 | /* glibc doesn't provide the needed interface. */ | |
1819 | if (!info->td_thr_tls_get_addr_p) | |
1820 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1821 | _("No TLS library support")); | |
1822 | ||
1823 | /* Note the cast through uintptr_t: this interface only works if | |
1824 | a target address fits in a psaddr_t, which is a host pointer. | |
1825 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
1826 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, | |
1827 | (psaddr_t)(uintptr_t) lm, | |
1828 | offset, &address); | |
1829 | } | |
1830 | else | |
1831 | { | |
1832 | /* If glibc doesn't provide the needed interface throw an error | |
1833 | that LM is zero - normally cases it should not be. */ | |
1834 | if (!info->td_thr_tlsbase_p) | |
1835 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1836 | _("TLS load module not found")); | |
1837 | ||
1838 | /* This code path handles the case of -static -pthread executables: | |
1839 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1840 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1841 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1842 | The constant number 1 depends on GNU __libc_setup_tls | |
1843 | initialization of l_tls_modid to 1. */ | |
1844 | err = info->td_thr_tlsbase_p (&thread_info->private->th, | |
1845 | 1, &address); | |
1846 | address = (char *) address + offset; | |
1847 | } | |
3f47be5c EZ |
1848 | |
1849 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1850 | /* The memory hasn't been allocated, yet. */ | |
1851 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1852 | /* Now, if libthread_db provided the initialization image's |
1853 | address, we *could* try to build a non-lvalue value from | |
1854 | the initialization image. */ | |
109c3e39 AC |
1855 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1856 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1857 | #endif |
1858 | ||
1859 | /* Something else went wrong. */ | |
1860 | if (err != TD_OK) | |
109c3e39 AC |
1861 | throw_error (TLS_GENERIC_ERROR, |
1862 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1863 | |
1864 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1865 | /* Do proper sign extension for the target. */ |
1866 | gdb_assert (exec_bfd); | |
1867 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1868 | ? (CORE_ADDR) (intptr_t) address | |
1869 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1870 | } |
1871 | ||
117de6a9 | 1872 | beneath = find_target_beneath (ops); |
f0f9ff95 | 1873 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); |
3f47be5c EZ |
1874 | } |
1875 | ||
0ef643c8 JB |
1876 | /* Callback routine used to find a thread based on the TID part of |
1877 | its PTID. */ | |
1878 | ||
1879 | static int | |
1880 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1881 | { | |
1882 | long *tid = (long *) data; | |
1883 | ||
1884 | if (thread->private->tid == *tid) | |
1885 | return 1; | |
1886 | ||
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1891 | ||
1892 | static ptid_t | |
1e6b91a4 | 1893 | thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) |
0ef643c8 JB |
1894 | { |
1895 | struct thread_info *thread_info; | |
1896 | ||
d90e17a7 | 1897 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1898 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1899 | ||
1900 | gdb_assert (thread_info != NULL); | |
1901 | ||
1902 | return (thread_info->ptid); | |
1903 | } | |
1904 | ||
4d062f1a PA |
1905 | static void |
1906 | thread_db_resume (struct target_ops *ops, | |
2ea28649 | 1907 | ptid_t ptid, int step, enum gdb_signal signo) |
4d062f1a PA |
1908 | { |
1909 | struct target_ops *beneath = find_target_beneath (ops); | |
1910 | struct thread_db_info *info; | |
1911 | ||
1912 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1913 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1914 | else |
dfd4cc63 | 1915 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1916 | |
1917 | /* This workaround is only needed for child fork lwps stopped in a | |
1918 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1919 | workaround can be disabled. */ | |
1920 | if (info) | |
1921 | info->need_stale_parent_threads_check = 0; | |
1922 | ||
1923 | beneath->to_resume (beneath, ptid, step, signo); | |
1924 | } | |
1925 | ||
bf88dd68 JK |
1926 | /* qsort helper function for info_auto_load_libthread_db, sort the |
1927 | thread_db_info pointers primarily by their FILENAME and secondarily by their | |
1928 | PID, both in ascending order. */ | |
1929 | ||
1930 | static int | |
1931 | info_auto_load_libthread_db_compare (const void *ap, const void *bp) | |
1932 | { | |
1933 | struct thread_db_info *a = *(struct thread_db_info **) ap; | |
1934 | struct thread_db_info *b = *(struct thread_db_info **) bp; | |
1935 | int retval; | |
1936 | ||
1937 | retval = strcmp (a->filename, b->filename); | |
1938 | if (retval) | |
1939 | return retval; | |
1940 | ||
1941 | return (a->pid > b->pid) - (a->pid - b->pid); | |
1942 | } | |
1943 | ||
1944 | /* Implement 'info auto-load libthread-db'. */ | |
1945 | ||
1946 | static void | |
1947 | info_auto_load_libthread_db (char *args, int from_tty) | |
1948 | { | |
1949 | struct ui_out *uiout = current_uiout; | |
1950 | const char *cs = args ? args : ""; | |
1951 | struct thread_db_info *info, **array; | |
1952 | unsigned info_count, unique_filenames; | |
1953 | size_t max_filename_len, max_pids_len, pids_len; | |
1954 | struct cleanup *back_to; | |
1955 | char *pids; | |
1956 | int i; | |
1957 | ||
529480d0 | 1958 | cs = skip_spaces_const (cs); |
bf88dd68 JK |
1959 | if (*cs) |
1960 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1961 | ||
1962 | info_count = 0; | |
1963 | for (info = thread_db_list; info; info = info->next) | |
1964 | if (info->filename != NULL) | |
1965 | info_count++; | |
1966 | ||
1967 | array = xmalloc (sizeof (*array) * info_count); | |
1968 | back_to = make_cleanup (xfree, array); | |
1969 | ||
1970 | info_count = 0; | |
1971 | for (info = thread_db_list; info; info = info->next) | |
1972 | if (info->filename != NULL) | |
1973 | array[info_count++] = info; | |
1974 | ||
1975 | /* Sort ARRAY by filenames and PIDs. */ | |
1976 | ||
1977 | qsort (array, info_count, sizeof (*array), | |
1978 | info_auto_load_libthread_db_compare); | |
1979 | ||
1980 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1981 | length of PIDs list for the unique filenames (columns). */ | |
1982 | ||
1983 | unique_filenames = 0; | |
1984 | max_filename_len = 0; | |
1985 | max_pids_len = 0; | |
1986 | pids_len = 0; | |
1987 | for (i = 0; i < info_count; i++) | |
1988 | { | |
1989 | int pid = array[i]->pid; | |
1990 | size_t this_pid_len; | |
1991 | ||
1992 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1993 | this_pid_len++; | |
1994 | ||
1995 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1996 | { | |
1997 | unique_filenames++; | |
1998 | max_filename_len = max (max_filename_len, | |
1999 | strlen (array[i]->filename)); | |
2000 | ||
2001 | if (i > 0) | |
2002 | { | |
2003 | pids_len -= strlen (", "); | |
2004 | max_pids_len = max (max_pids_len, pids_len); | |
2005 | } | |
2006 | pids_len = 0; | |
2007 | } | |
2008 | pids_len += this_pid_len + strlen (", "); | |
2009 | } | |
2010 | if (i) | |
2011 | { | |
2012 | pids_len -= strlen (", "); | |
2013 | max_pids_len = max (max_pids_len, pids_len); | |
2014 | } | |
2015 | ||
2016 | /* Table header shifted right by preceding "libthread-db: " would not match | |
2017 | its columns. */ | |
2018 | if (info_count > 0 && args == auto_load_info_scripts_pattern_nl) | |
2019 | ui_out_text (uiout, "\n"); | |
2020 | ||
2021 | make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames, | |
2022 | "LinuxThreadDbTable"); | |
2023 | ||
2024 | ui_out_table_header (uiout, max_filename_len, ui_left, "filename", | |
2025 | "Filename"); | |
2026 | ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids"); | |
2027 | ui_out_table_body (uiout); | |
2028 | ||
2029 | pids = xmalloc (max_pids_len + 1); | |
2030 | make_cleanup (xfree, pids); | |
2031 | ||
2032 | /* Note I is incremented inside the cycle, not at its end. */ | |
2033 | for (i = 0; i < info_count;) | |
2034 | { | |
2035 | struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); | |
2036 | char *pids_end; | |
2037 | ||
2038 | info = array[i]; | |
2039 | ui_out_field_string (uiout, "filename", info->filename); | |
2040 | pids_end = pids; | |
2041 | ||
2042 | while (i < info_count && strcmp (info->filename, array[i]->filename) == 0) | |
2043 | { | |
2044 | if (pids_end != pids) | |
2045 | { | |
2046 | *pids_end++ = ','; | |
2047 | *pids_end++ = ' '; | |
2048 | } | |
2049 | pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end, | |
2050 | "%u", array[i]->pid); | |
2051 | gdb_assert (pids_end < &pids[max_pids_len + 1]); | |
2052 | ||
2053 | i++; | |
2054 | } | |
2055 | *pids_end = '\0'; | |
2056 | ||
2057 | ui_out_field_string (uiout, "pids", pids); | |
2058 | ||
2059 | ui_out_text (uiout, "\n"); | |
2060 | do_cleanups (chain); | |
2061 | } | |
2062 | ||
2063 | do_cleanups (back_to); | |
2064 | ||
2065 | if (info_count == 0) | |
2066 | ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n")); | |
2067 | } | |
2068 | ||
fb0e1ba7 MK |
2069 | static void |
2070 | init_thread_db_ops (void) | |
2071 | { | |
2072 | thread_db_ops.to_shortname = "multi-thread"; | |
2073 | thread_db_ops.to_longname = "multi-threaded child process."; | |
2074 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
2075 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 2076 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 2077 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 2078 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
e8032dde | 2079 | thread_db_ops.to_update_thread_list = thread_db_update_thread_list; |
fb0e1ba7 MK |
2080 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
2081 | thread_db_ops.to_stratum = thread_stratum; | |
2082 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
2083 | thread_db_ops.to_get_thread_local_address |
2084 | = thread_db_get_thread_local_address; | |
28b17333 | 2085 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 2086 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 | 2087 | thread_db_ops.to_magic = OPS_MAGIC; |
c22a2b88 TT |
2088 | |
2089 | complete_target_initialization (&thread_db_ops); | |
fb0e1ba7 MK |
2090 | } |
2091 | ||
2c0b251b PA |
2092 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
2093 | extern initialize_file_ftype _initialize_thread_db; | |
2094 | ||
fb0e1ba7 MK |
2095 | void |
2096 | _initialize_thread_db (void) | |
2097 | { | |
17a37d48 | 2098 | init_thread_db_ops (); |
17a37d48 PP |
2099 | |
2100 | /* Defer loading of libthread_db.so until inferior is running. | |
2101 | This allows gdb to load correct libthread_db for a given | |
2102 | executable -- there could be mutiple versions of glibc, | |
2103 | compiled with LinuxThreads or NPTL, and until there is | |
2104 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 2105 | the correct one to load. */ |
17a37d48 PP |
2106 | |
2107 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
2108 | ||
2109 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
2110 | class_support, | |
2111 | &libthread_db_search_path, _("\ | |
2112 | Set search path for libthread_db."), _("\ | |
2113 | Show the current search path or libthread_db."), _("\ | |
2114 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
2115 | gdb itself.\n\ |
2116 | Its value is a colon (':') separate list of directories to search.\n\ | |
2117 | Setting the search path to an empty list resets it to its default value."), | |
2118 | set_libthread_db_search_path, | |
17a37d48 PP |
2119 | NULL, |
2120 | &setlist, &showlist); | |
02d868e8 | 2121 | |
ccce17b0 YQ |
2122 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
2123 | &libthread_db_debug, _("\ | |
02d868e8 PP |
2124 | Set libthread-db debugging."), _("\ |
2125 | Show libthread-db debugging."), _("\ | |
2126 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
2127 | NULL, |
2128 | show_libthread_db_debug, | |
2129 | &setdebuglist, &showdebuglist); | |
02d868e8 | 2130 | |
bf88dd68 JK |
2131 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2132 | &auto_load_thread_db, _("\ | |
2133 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2134 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2135 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2136 | locations to load libthread_db compatible with the inferior.\n\ | |
2137 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
2138 | This options has security implications for untrusted inferiors."), | |
2139 | NULL, show_auto_load_thread_db, | |
2140 | auto_load_set_cmdlist_get (), | |
2141 | auto_load_show_cmdlist_get ()); | |
2142 | ||
2143 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2144 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2145 | Usage: info auto-load libthread-db"), | |
2146 | auto_load_info_cmdlist_get ()); | |
2147 | ||
17a37d48 PP |
2148 | /* Add ourselves to objfile event chain. */ |
2149 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
2150 | |
2151 | /* Add ourselves to inferior_created event chain. | |
2152 | This is needed to handle debugging statically linked programs where | |
2153 | the new_objfile observer won't get called for libpthread. */ | |
2154 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 2155 | } |