Commit | Line | Data |
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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
28e7fd62 | 3 | Copyright (C) 1999-2013 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" | |
21 | ||
22 | #include "gdb_assert.h" | |
23 | #include <dlfcn.h> | |
24 | #include "gdb_proc_service.h" | |
25 | #include "gdb_thread_db.h" | |
e6712ff1 | 26 | #include "gdb_vecs.h" |
bda9cb72 | 27 | #include "bfd.h" |
17a37d48 | 28 | #include "command.h" |
93ad78a7 | 29 | #include "exceptions.h" |
17a37d48 | 30 | #include "gdbcmd.h" |
fb0e1ba7 MK |
31 | #include "gdbthread.h" |
32 | #include "inferior.h" | |
bda9cb72 MK |
33 | #include "symfile.h" |
34 | #include "objfiles.h" | |
fb0e1ba7 | 35 | #include "target.h" |
4e052eda | 36 | #include "regcache.h" |
17a37d48 | 37 | #include "solib.h" |
3f47be5c | 38 | #include "solib-svr4.h" |
16451949 | 39 | #include "gdbcore.h" |
06d3b283 | 40 | #include "observer.h" |
0ec9a092 | 41 | #include "linux-nat.h" |
13da1c97 | 42 | #include "linux-procfs.h" |
2e794194 | 43 | #include "linux-osdata.h" |
bf88dd68 | 44 | #include "auto-load.h" |
529480d0 | 45 | #include "cli/cli-utils.h" |
fb0e1ba7 | 46 | |
979894f2 | 47 | #include <signal.h> |
bf88dd68 | 48 | #include <ctype.h> |
979894f2 | 49 | |
17faa917 DJ |
50 | /* GNU/Linux libthread_db support. |
51 | ||
52 | libthread_db is a library, provided along with libpthread.so, which | |
53 | exposes the internals of the thread library to a debugger. It | |
54 | allows GDB to find existing threads, new threads as they are | |
55 | created, thread IDs (usually, the result of pthread_self), and | |
56 | thread-local variables. | |
57 | ||
58 | The libthread_db interface originates on Solaris, where it is | |
59 | both more powerful and more complicated. This implementation | |
60 | only works for LinuxThreads and NPTL, the two glibc threading | |
61 | libraries. It assumes that each thread is permanently assigned | |
62 | to a single light-weight process (LWP). | |
63 | ||
64 | libthread_db-specific information is stored in the "private" field | |
65 | of struct thread_info. When the field is NULL we do not yet have | |
66 | information about the new thread; this could be temporary (created, | |
67 | but the thread library's data structures do not reflect it yet) | |
68 | or permanent (created using clone instead of pthread_create). | |
69 | ||
70 | Process IDs managed by linux-thread-db.c match those used by | |
71 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
72 | thread, and no TID. We save the TID in private. Keeping it out | |
73 | of the ptid_t prevents thread IDs changing when libpthread is | |
74 | loaded or unloaded. */ | |
75 | ||
17a37d48 PP |
76 | static char *libthread_db_search_path; |
77 | ||
bf88dd68 JK |
78 | /* Set to non-zero if thread_db auto-loading is enabled |
79 | by the "set auto-load libthread-db" command. */ | |
80 | static int auto_load_thread_db = 1; | |
81 | ||
82 | /* "show" command for the auto_load_thread_db configuration variable. */ | |
83 | ||
84 | static void | |
85 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
86 | struct cmd_list_element *c, const char *value) | |
87 | { | |
88 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
89 | "is %s.\n"), | |
90 | value); | |
91 | } | |
92 | ||
84e578fb DE |
93 | static void |
94 | set_libthread_db_search_path (char *ignored, int from_tty, | |
95 | struct cmd_list_element *c) | |
96 | { | |
97 | if (*libthread_db_search_path == '\0') | |
98 | { | |
99 | xfree (libthread_db_search_path); | |
100 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
101 | } | |
102 | } | |
103 | ||
02d868e8 PP |
104 | /* If non-zero, print details of libthread_db processing. */ |
105 | ||
ccce17b0 | 106 | static unsigned int libthread_db_debug; |
02d868e8 PP |
107 | |
108 | static void | |
109 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
110 | struct cmd_list_element *c, const char *value) | |
111 | { | |
112 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
113 | } | |
114 | ||
8605d56e AC |
115 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
116 | threads. */ | |
fb0e1ba7 | 117 | |
fb0e1ba7 MK |
118 | /* This module's target vector. */ |
119 | static struct target_ops thread_db_ops; | |
120 | ||
fb0e1ba7 MK |
121 | /* Non-zero if we have determined the signals used by the threads |
122 | library. */ | |
123 | static int thread_signals; | |
124 | static sigset_t thread_stop_set; | |
125 | static sigset_t thread_print_set; | |
126 | ||
d90e17a7 PA |
127 | struct thread_db_info |
128 | { | |
129 | struct thread_db_info *next; | |
130 | ||
131 | /* Process id this object refers to. */ | |
132 | int pid; | |
133 | ||
134 | /* Handle from dlopen for libthread_db.so. */ | |
135 | void *handle; | |
136 | ||
bf88dd68 JK |
137 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
138 | HANDLE. It may be NULL for system library. */ | |
139 | char *filename; | |
140 | ||
d90e17a7 PA |
141 | /* Structure that identifies the child process for the |
142 | <proc_service.h> interface. */ | |
143 | struct ps_prochandle proc_handle; | |
144 | ||
145 | /* Connection to the libthread_db library. */ | |
146 | td_thragent_t *thread_agent; | |
147 | ||
4d062f1a PA |
148 | /* True if we need to apply the workaround for glibc/BZ5983. When |
149 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
150 | list, nptl_db returns the parent's threads in addition to the new | |
151 | (single) child thread. If this flag is set, we do extra work to | |
152 | be able to ignore such stale entries. */ | |
153 | int need_stale_parent_threads_check; | |
154 | ||
d90e17a7 PA |
155 | /* Location of the thread creation event breakpoint. The code at |
156 | this location in the child process will be called by the pthread | |
157 | library whenever a new thread is created. By setting a special | |
158 | breakpoint at this location, GDB can detect when a new thread is | |
159 | created. We obtain this location via the td_ta_event_addr | |
160 | call. */ | |
161 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 162 | |
d90e17a7 PA |
163 | /* Location of the thread death event breakpoint. */ |
164 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 165 | |
d90e17a7 | 166 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 167 | |
d90e17a7 | 168 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 169 | |
d90e17a7 | 170 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 171 | td_thragent_t **ta); |
d90e17a7 PA |
172 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
173 | td_thrhandle_t *__th); | |
174 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
175 | lwpid_t lwpid, td_thrhandle_t *th); | |
176 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
177 | td_thr_iter_f *callback, void *cbdata_p, | |
178 | td_thr_state_e state, int ti_pri, | |
179 | sigset_t *ti_sigmask_p, | |
180 | unsigned int ti_user_flags); | |
181 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
182 | td_event_e event, td_notify_t *ptr); | |
183 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
184 | td_thr_events_t *event); | |
21e1bee4 PP |
185 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
186 | td_thr_events_t *event); | |
d90e17a7 PA |
187 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
188 | td_event_msg_t *msg); | |
189 | ||
190 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
191 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
192 | td_thrinfo_t *infop); | |
193 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
194 | int event); | |
195 | ||
196 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
197 | psaddr_t map_address, |
198 | size_t offset, psaddr_t *address); | |
d90e17a7 PA |
199 | }; |
200 | ||
201 | /* List of known processes using thread_db, and the required | |
202 | bookkeeping. */ | |
203 | struct thread_db_info *thread_db_list; | |
204 | ||
205 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 206 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 PA |
207 | |
208 | /* Add the current inferior to the list of processes using libpthread. | |
209 | Return a pointer to the newly allocated object that was added to | |
210 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
211 | LIBTHREAD_DB_SO. */ | |
212 | ||
213 | static struct thread_db_info * | |
214 | add_thread_db_info (void *handle) | |
215 | { | |
d90e17a7 PA |
216 | struct thread_db_info *info; |
217 | ||
218 | info = xcalloc (1, sizeof (*info)); | |
219 | info->pid = ptid_get_pid (inferior_ptid); | |
220 | info->handle = handle; | |
856d6f99 PA |
221 | |
222 | /* The workaround works by reading from /proc/pid/status, so it is | |
223 | disabled for core files. */ | |
224 | if (target_has_execution) | |
225 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
226 | |
227 | info->next = thread_db_list; | |
228 | thread_db_list = info; | |
229 | ||
230 | return info; | |
231 | } | |
232 | ||
233 | /* Return the thread_db_info object representing the bookkeeping | |
234 | related to process PID, if any; NULL otherwise. */ | |
235 | ||
236 | static struct thread_db_info * | |
237 | get_thread_db_info (int pid) | |
238 | { | |
239 | struct thread_db_info *info; | |
240 | ||
241 | for (info = thread_db_list; info; info = info->next) | |
242 | if (pid == info->pid) | |
243 | return info; | |
244 | ||
245 | return NULL; | |
246 | } | |
247 | ||
248 | /* When PID has exited or has been detached, we no longer want to keep | |
249 | track of it as using libpthread. Call this function to discard | |
250 | thread_db related info related to PID. Note that this closes | |
251 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
252 | ||
253 | static void | |
254 | delete_thread_db_info (int pid) | |
255 | { | |
256 | struct thread_db_info *info, *info_prev; | |
257 | ||
258 | info_prev = NULL; | |
259 | ||
260 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
261 | if (pid == info->pid) | |
262 | break; | |
263 | ||
264 | if (info == NULL) | |
265 | return; | |
266 | ||
267 | if (info->handle != NULL) | |
268 | dlclose (info->handle); | |
269 | ||
bf88dd68 JK |
270 | xfree (info->filename); |
271 | ||
d90e17a7 PA |
272 | if (info_prev) |
273 | info_prev->next = info->next; | |
274 | else | |
275 | thread_db_list = info->next; | |
276 | ||
277 | xfree (info); | |
278 | } | |
fb0e1ba7 MK |
279 | |
280 | /* Prototypes for local functions. */ | |
02c6c942 PP |
281 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
282 | const td_thrinfo_t *ti_p); | |
17faa917 | 283 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
284 | \f |
285 | ||
5365276c DJ |
286 | /* Use "struct private_thread_info" to cache thread state. This is |
287 | a substantial optimization. */ | |
288 | ||
fb0e1ba7 MK |
289 | struct private_thread_info |
290 | { | |
a2f23071 DJ |
291 | /* Flag set when we see a TD_DEATH event for this thread. */ |
292 | unsigned int dying:1; | |
293 | ||
5365276c | 294 | /* Cached thread state. */ |
5365276c | 295 | td_thrhandle_t th; |
17faa917 | 296 | thread_t tid; |
fb0e1ba7 | 297 | }; |
fb0e1ba7 | 298 | \f |
21bf60fe | 299 | |
fb0e1ba7 MK |
300 | static char * |
301 | thread_db_err_str (td_err_e err) | |
302 | { | |
303 | static char buf[64]; | |
304 | ||
305 | switch (err) | |
306 | { | |
307 | case TD_OK: | |
308 | return "generic 'call succeeded'"; | |
309 | case TD_ERR: | |
310 | return "generic error"; | |
311 | case TD_NOTHR: | |
312 | return "no thread to satisfy query"; | |
313 | case TD_NOSV: | |
314 | return "no sync handle to satisfy query"; | |
315 | case TD_NOLWP: | |
316 | return "no LWP to satisfy query"; | |
317 | case TD_BADPH: | |
318 | return "invalid process handle"; | |
319 | case TD_BADTH: | |
320 | return "invalid thread handle"; | |
321 | case TD_BADSH: | |
322 | return "invalid synchronization handle"; | |
323 | case TD_BADTA: | |
324 | return "invalid thread agent"; | |
325 | case TD_BADKEY: | |
326 | return "invalid key"; | |
327 | case TD_NOMSG: | |
328 | return "no event message for getmsg"; | |
329 | case TD_NOFPREGS: | |
330 | return "FPU register set not available"; | |
331 | case TD_NOLIBTHREAD: | |
332 | return "application not linked with libthread"; | |
333 | case TD_NOEVENT: | |
334 | return "requested event is not supported"; | |
335 | case TD_NOCAPAB: | |
336 | return "capability not available"; | |
337 | case TD_DBERR: | |
338 | return "debugger service failed"; | |
339 | case TD_NOAPLIC: | |
340 | return "operation not applicable to"; | |
341 | case TD_NOTSD: | |
342 | return "no thread-specific data for this thread"; | |
343 | case TD_MALLOC: | |
344 | return "malloc failed"; | |
345 | case TD_PARTIALREG: | |
346 | return "only part of register set was written/read"; | |
347 | case TD_NOXREGS: | |
348 | return "X register set not available for this thread"; | |
59f80f10 DJ |
349 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
350 | case TD_NOTALLOC: | |
351 | return "thread has not yet allocated TLS for given module"; | |
352 | #endif | |
353 | #ifdef THREAD_DB_HAS_TD_VERSION | |
354 | case TD_VERSION: | |
355 | return "versions of libpthread and libthread_db do not match"; | |
356 | #endif | |
357 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
358 | case TD_NOTLS: | |
359 | return "there is no TLS segment in the given module"; | |
360 | #endif | |
fb0e1ba7 MK |
361 | default: |
362 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
363 | return buf; | |
364 | } | |
365 | } | |
fb0e1ba7 | 366 | \f |
4105de34 DJ |
367 | /* Return 1 if any threads have been registered. There may be none if |
368 | the threading library is not fully initialized yet. */ | |
369 | ||
370 | static int | |
d90e17a7 | 371 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 372 | { |
d90e17a7 | 373 | int pid = * (int *) args; |
e0881a8e | 374 | |
d90e17a7 PA |
375 | if (ptid_get_pid (thread->ptid) != pid) |
376 | return 0; | |
377 | ||
e3bc4218 | 378 | return thread->private != NULL; |
4105de34 DJ |
379 | } |
380 | ||
381 | static int | |
d90e17a7 | 382 | have_threads (ptid_t ptid) |
4105de34 | 383 | { |
d90e17a7 PA |
384 | int pid = ptid_get_pid (ptid); |
385 | ||
386 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
387 | } |
388 | ||
d90e17a7 PA |
389 | struct thread_get_info_inout |
390 | { | |
391 | struct thread_info *thread_info; | |
392 | struct thread_db_info *thread_db_info; | |
393 | }; | |
394 | ||
5365276c | 395 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 396 | threads to LWPs. |
5365276c DJ |
397 | |
398 | THP is a handle to the current thread; if INFOP is not NULL, the | |
399 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
400 | *INFOP. |
401 | ||
402 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
403 | zero is returned to indicate success. */ | |
5365276c DJ |
404 | |
405 | static int | |
d90e17a7 | 406 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
407 | { |
408 | td_thrinfo_t ti; | |
409 | td_err_e err; | |
5365276c | 410 | ptid_t thread_ptid; |
d90e17a7 PA |
411 | struct thread_get_info_inout *inout; |
412 | struct thread_db_info *info; | |
413 | ||
414 | inout = argp; | |
415 | info = inout->thread_db_info; | |
5365276c | 416 | |
d90e17a7 | 417 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 418 | if (err != TD_OK) |
8a3fe4f8 | 419 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
420 | thread_db_err_str (err)); |
421 | ||
422 | /* Fill the cache. */ | |
d90e17a7 | 423 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 424 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 425 | |
d90e17a7 | 426 | if (inout->thread_info == NULL) |
5365276c DJ |
427 | { |
428 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
429 | if (!have_threads (thread_ptid)) |
430 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
431 | else |
432 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 433 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 434 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
435 | } |
436 | ||
5365276c DJ |
437 | return 0; |
438 | } | |
5365276c | 439 | \f |
64776a0b | 440 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 441 | |
64776a0b | 442 | static void |
39f77062 | 443 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 444 | { |
fb0e1ba7 MK |
445 | td_thrhandle_t th; |
446 | td_err_e err; | |
d90e17a7 PA |
447 | struct thread_db_info *info; |
448 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 449 | |
6cb9b55b PP |
450 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
451 | th.th_unique = 0; | |
452 | ||
17faa917 DJ |
453 | /* This ptid comes from linux-nat.c, which should always fill in the |
454 | LWP. */ | |
dfd4cc63 | 455 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 456 | |
dfd4cc63 | 457 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 458 | |
4c28f408 | 459 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 460 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
461 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
462 | &th); | |
fb0e1ba7 | 463 | if (err != TD_OK) |
8a3fe4f8 | 464 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 465 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 466 | |
64776a0b | 467 | /* Long-winded way of fetching the thread info. */ |
d90e17a7 PA |
468 | io.thread_db_info = info; |
469 | io.thread_info = NULL; | |
64776a0b | 470 | thread_get_info_callback (&th, &io); |
fb0e1ba7 MK |
471 | } |
472 | \f | |
473 | ||
4c28f408 PA |
474 | /* Attach to lwp PTID, doing whatever else is required to have this |
475 | LWP under the debugger's control --- e.g., enabling event | |
476 | reporting. Returns true on success. */ | |
477 | int | |
478 | thread_db_attach_lwp (ptid_t ptid) | |
479 | { | |
480 | td_thrhandle_t th; | |
481 | td_thrinfo_t ti; | |
482 | td_err_e err; | |
d90e17a7 | 483 | struct thread_db_info *info; |
4c28f408 | 484 | |
dfd4cc63 | 485 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
486 | |
487 | if (info == NULL) | |
4c28f408 PA |
488 | return 0; |
489 | ||
490 | /* This ptid comes from linux-nat.c, which should always fill in the | |
491 | LWP. */ | |
dfd4cc63 | 492 | gdb_assert (ptid_get_lwp (ptid) != 0); |
4c28f408 PA |
493 | |
494 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 495 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
496 | |
497 | /* If we have only looked at the first thread before libpthread was | |
498 | initialized, we may not know its thread ID yet. Make sure we do | |
499 | before we add another thread to the list. */ | |
d90e17a7 PA |
500 | if (!have_threads (ptid)) |
501 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 502 | |
dfd4cc63 LM |
503 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
504 | &th); | |
4c28f408 PA |
505 | if (err != TD_OK) |
506 | /* Cannot find user-level thread. */ | |
507 | return 0; | |
508 | ||
d90e17a7 | 509 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
510 | if (err != TD_OK) |
511 | { | |
512 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | attach_thread (ptid, &th, &ti); | |
517 | return 1; | |
518 | } | |
519 | ||
5220ea4c AC |
520 | static void * |
521 | verbose_dlsym (void *handle, const char *name) | |
522 | { | |
523 | void *sym = dlsym (handle, name); | |
524 | if (sym == NULL) | |
3e43a32a MS |
525 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
526 | name, dlerror ()); | |
5220ea4c AC |
527 | return sym; |
528 | } | |
529 | ||
cdbc0b18 | 530 | static td_err_e |
d90e17a7 | 531 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
532 | { |
533 | td_notify_t notify; | |
cdbc0b18 | 534 | td_err_e err; |
d90e17a7 PA |
535 | struct thread_db_info *info; |
536 | ||
dfd4cc63 | 537 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
24557e30 | 538 | |
4c28f408 | 539 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 540 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 541 | |
24557e30 | 542 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 543 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 544 | if (err != TD_OK) |
cdbc0b18 | 545 | return err; |
24557e30 AC |
546 | |
547 | /* Set up the breakpoint. */ | |
16451949 AS |
548 | gdb_assert (exec_bfd); |
549 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
f5656ead | 550 | (target_gdbarch (), |
16451949 AS |
551 | /* Do proper sign extension for the target. */ |
552 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
553 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
554 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
555 | ¤t_target)); | |
f5656ead | 556 | create_thread_event_breakpoint (target_gdbarch (), *bp); |
24557e30 | 557 | |
cdbc0b18 | 558 | return TD_OK; |
24557e30 AC |
559 | } |
560 | ||
fcb44371 JK |
561 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
562 | return 1 if this version is lower (and not equal) to | |
563 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
564 | ||
565 | static int | |
566 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
567 | { | |
568 | struct minimal_symbol *version_msym; | |
569 | CORE_ADDR version_addr; | |
570 | char *version; | |
571 | int err, got, retval = 0; | |
572 | ||
573 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
574 | if (version_msym == NULL) | |
575 | return 0; | |
576 | ||
577 | version_addr = SYMBOL_VALUE_ADDRESS (version_msym); | |
578 | got = target_read_string (version_addr, &version, 32, &err); | |
579 | if (err == 0 && memchr (version, 0, got) == &version[got -1]) | |
580 | { | |
581 | int major, minor; | |
582 | ||
583 | retval = (sscanf (version, "%d.%d", &major, &minor) == 2 | |
584 | && (major < ver_major_min | |
585 | || (major == ver_major_min && minor < ver_minor_min))); | |
586 | } | |
587 | xfree (version); | |
588 | ||
589 | return retval; | |
590 | } | |
591 | ||
fb0e1ba7 MK |
592 | static void |
593 | enable_thread_event_reporting (void) | |
594 | { | |
595 | td_thr_events_t events; | |
fb0e1ba7 | 596 | td_err_e err; |
d90e17a7 PA |
597 | struct thread_db_info *info; |
598 | ||
dfd4cc63 | 599 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 MK |
600 | |
601 | /* We cannot use the thread event reporting facility if these | |
602 | functions aren't available. */ | |
d90e17a7 PA |
603 | if (info->td_ta_event_addr_p == NULL |
604 | || info->td_ta_set_event_p == NULL | |
605 | || info->td_ta_event_getmsg_p == NULL | |
606 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
607 | return; |
608 | ||
609 | /* Set the process wide mask saying which events we're interested in. */ | |
610 | td_event_emptyset (&events); | |
611 | td_event_addset (&events, TD_CREATE); | |
a2f23071 | 612 | |
8775fd2d JK |
613 | /* There is a bug fixed between linuxthreads 2.1.3 and 2.2 by |
614 | commit 2e4581e4fba917f1779cd0a010a45698586c190a | |
615 | * manager.c (pthread_exited): Correctly report event as TD_REAP | |
616 | instead of TD_DEATH. Fix comments. | |
617 | where event reporting facility is broken for TD_DEATH events, | |
618 | so don't enable it if we have glibc but a lower version. */ | |
619 | if (!inferior_has_bug ("__linuxthreads_version", 2, 2)) | |
a2f23071 | 620 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 621 | |
d90e17a7 | 622 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
623 | if (err != TD_OK) |
624 | { | |
8a3fe4f8 | 625 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
626 | thread_db_err_str (err)); |
627 | return; | |
628 | } | |
629 | ||
630 | /* Delete previous thread event breakpoints, if any. */ | |
631 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
632 | info->td_create_bp_addr = 0; |
633 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 634 | |
24557e30 | 635 | /* Set up the thread creation event. */ |
d90e17a7 | 636 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 637 | if (err != TD_OK) |
fb0e1ba7 | 638 | { |
8a3fe4f8 | 639 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
640 | thread_db_err_str (err)); |
641 | return; | |
642 | } | |
643 | ||
24557e30 | 644 | /* Set up the thread death event. */ |
d90e17a7 | 645 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 646 | if (err != TD_OK) |
fb0e1ba7 | 647 | { |
8a3fe4f8 | 648 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
649 | thread_db_err_str (err)); |
650 | return; | |
651 | } | |
fb0e1ba7 MK |
652 | } |
653 | ||
fcb44371 JK |
654 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
655 | if appropriate. | |
456b0e24 | 656 | |
fcb44371 JK |
657 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
658 | otherwise. */ | |
659 | ||
660 | static int | |
456b0e24 PP |
661 | thread_db_find_new_threads_silently (ptid_t ptid) |
662 | { | |
663 | volatile struct gdb_exception except; | |
664 | ||
665 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
666 | { | |
02c6c942 | 667 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
668 | } |
669 | ||
fcb44371 | 670 | if (except.reason < 0) |
e0881a8e | 671 | { |
fcb44371 JK |
672 | if (libthread_db_debug) |
673 | exception_fprintf (gdb_stderr, except, | |
674 | "Warning: thread_db_find_new_threads_silently: "); | |
675 | ||
676 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
677 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
678 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
679 | executables if td_thr_get_info is called before glibc has initialized | |
680 | itself. | |
681 | ||
682 | If the nptl bug is NOT present in the inferior and still thread_db | |
683 | reports an error return 1. It means the inferior has corrupted thread | |
684 | list and GDB should fall back only to LWPs. | |
685 | ||
686 | If the nptl bug is present in the inferior return 0 to silently ignore | |
687 | such errors, and let gdb enumerate threads again later. In such case | |
688 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
689 | corrupted. For core files it does not apply, no 'later enumeration' |
690 | is possible. */ | |
fcb44371 | 691 | |
889003ed | 692 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
693 | { |
694 | exception_fprintf (gdb_stderr, except, | |
695 | _("Warning: couldn't activate thread debugging " | |
696 | "using libthread_db: ")); | |
697 | return 1; | |
698 | } | |
e0881a8e | 699 | } |
fcb44371 | 700 | return 0; |
456b0e24 PP |
701 | } |
702 | ||
d90e17a7 PA |
703 | /* Lookup a library in which given symbol resides. |
704 | Note: this is looking in GDB process, not in the inferior. | |
705 | Returns library name, or NULL. */ | |
706 | ||
707 | static const char * | |
708 | dladdr_to_soname (const void *addr) | |
709 | { | |
710 | Dl_info info; | |
711 | ||
712 | if (dladdr (addr, &info) != 0) | |
713 | return info.dli_fname; | |
714 | return NULL; | |
715 | } | |
716 | ||
2471d008 | 717 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
718 | Return 1 on success. |
719 | Failure could happen if libthread_db does not have symbols we expect, | |
720 | or when it refuses to work with the current inferior (e.g. due to | |
721 | version mismatch between libthread_db and libpthread). */ | |
722 | ||
723 | static int | |
d90e17a7 | 724 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
725 | { |
726 | td_err_e err; | |
727 | ||
728 | /* Initialize pointers to the dynamic library functions we will use. | |
729 | Essential functions first. */ | |
730 | ||
d90e17a7 PA |
731 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
732 | if (info->td_init_p == NULL) | |
17a37d48 PP |
733 | return 0; |
734 | ||
d90e17a7 | 735 | err = info->td_init_p (); |
17a37d48 PP |
736 | if (err != TD_OK) |
737 | { | |
3e43a32a MS |
738 | warning (_("Cannot initialize libthread_db: %s"), |
739 | thread_db_err_str (err)); | |
17a37d48 PP |
740 | return 0; |
741 | } | |
742 | ||
d90e17a7 PA |
743 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
744 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
745 | return 0; |
746 | ||
747 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 748 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
749 | |
750 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 751 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
752 | if (err != TD_OK) |
753 | { | |
02d868e8 | 754 | if (libthread_db_debug) |
17a37d48 PP |
755 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
756 | thread_db_err_str (err)); | |
757 | else | |
758 | switch (err) | |
759 | { | |
760 | case TD_NOLIBTHREAD: | |
761 | #ifdef THREAD_DB_HAS_TD_VERSION | |
762 | case TD_VERSION: | |
763 | #endif | |
764 | /* The errors above are not unexpected and silently ignored: | |
765 | they just mean we haven't found correct version of | |
766 | libthread_db yet. */ | |
767 | break; | |
768 | default: | |
769 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
770 | } | |
771 | return 0; | |
772 | } | |
773 | ||
d90e17a7 PA |
774 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
775 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
776 | return 0; |
777 | ||
3e43a32a MS |
778 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
779 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 780 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
781 | return 0; |
782 | ||
d90e17a7 PA |
783 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
784 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
785 | return 0; |
786 | ||
d90e17a7 PA |
787 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
788 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
789 | return 0; |
790 | ||
d90e17a7 PA |
791 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
792 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
793 | return 0; |
794 | ||
795 | /* These are not essential. */ | |
d90e17a7 PA |
796 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
797 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 798 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
799 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
800 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
801 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 | 802 | |
fcb44371 JK |
803 | if (thread_db_find_new_threads_silently (inferior_ptid) != 0) |
804 | { | |
805 | /* Even if libthread_db initializes, if the thread list is | |
806 | corrupted, we'd not manage to list any threads. Better reject this | |
807 | thread_db, and fall back to at least listing LWPs. */ | |
808 | return 0; | |
809 | } | |
810 | ||
17a37d48 PP |
811 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
812 | ||
02d868e8 | 813 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
814 | { |
815 | const char *library; | |
17a37d48 | 816 | |
d90e17a7 PA |
817 | library = dladdr_to_soname (*info->td_ta_new_p); |
818 | if (library == NULL) | |
819 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 820 | |
d90e17a7 PA |
821 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
822 | library); | |
823 | } | |
17a37d48 | 824 | |
d90e17a7 PA |
825 | /* The thread library was detected. Activate the thread_db target |
826 | if this is the first process using it. */ | |
827 | if (thread_db_list->next == NULL) | |
828 | push_target (&thread_db_ops); | |
17a37d48 | 829 | |
856d6f99 PA |
830 | /* Enable event reporting, but not when debugging a core file. */ |
831 | if (target_has_execution) | |
832 | enable_thread_event_reporting (); | |
456b0e24 | 833 | |
d90e17a7 | 834 | return 1; |
17a37d48 PP |
835 | } |
836 | ||
837 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
838 | relative, or just LIBTHREAD_DB. */ | |
839 | ||
840 | static int | |
841 | try_thread_db_load (const char *library) | |
842 | { | |
843 | void *handle; | |
d90e17a7 | 844 | struct thread_db_info *info; |
17a37d48 | 845 | |
02d868e8 | 846 | if (libthread_db_debug) |
17a37d48 PP |
847 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
848 | library); | |
849 | handle = dlopen (library, RTLD_NOW); | |
850 | if (handle == NULL) | |
851 | { | |
02d868e8 | 852 | if (libthread_db_debug) |
17a37d48 PP |
853 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
854 | return 0; | |
855 | } | |
856 | ||
02d868e8 | 857 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
858 | { |
859 | void *td_init; | |
860 | ||
861 | td_init = dlsym (handle, "td_init"); | |
862 | if (td_init != NULL) | |
863 | { | |
864 | const char *const libpath = dladdr_to_soname (td_init); | |
865 | ||
866 | if (libpath != NULL) | |
867 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
868 | library, libpath); | |
869 | } | |
870 | } | |
871 | ||
d90e17a7 PA |
872 | info = add_thread_db_info (handle); |
873 | ||
bf88dd68 JK |
874 | /* Do not save system library name, that one is always trusted. */ |
875 | if (strchr (library, '/') != NULL) | |
876 | info->filename = gdb_realpath (library); | |
877 | ||
d90e17a7 | 878 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
879 | return 1; |
880 | ||
881 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 882 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
883 | return 0; |
884 | } | |
885 | ||
290351b8 | 886 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
887 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
888 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
889 | The result is true for success. */ |
890 | ||
891 | static int | |
e6712ff1 | 892 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 893 | { |
05386e9e TT |
894 | struct cleanup *cleanup; |
895 | char *path, *cp; | |
896 | int result; | |
4262abfb | 897 | const char *obj_name = objfile_name (obj); |
290351b8 | 898 | |
4262abfb | 899 | if (obj_name[0] != '/') |
290351b8 DE |
900 | { |
901 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 902 | " inferior, but got %s."), obj_name); |
290351b8 DE |
903 | return 0; |
904 | } | |
05386e9e | 905 | |
4262abfb | 906 | path = xmalloc (strlen (obj_name) + (subdir ? strlen (subdir) + 1 : 0) |
e6712ff1 | 907 | + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
05386e9e TT |
908 | cleanup = make_cleanup (xfree, path); |
909 | ||
4262abfb | 910 | strcpy (path, obj_name); |
05386e9e TT |
911 | cp = strrchr (path, '/'); |
912 | /* This should at minimum hit the first character. */ | |
913 | gdb_assert (cp != NULL); | |
e6712ff1 DE |
914 | cp[1] = '\0'; |
915 | if (subdir != NULL) | |
916 | { | |
917 | strcat (cp, subdir); | |
918 | strcat (cp, "/"); | |
919 | } | |
920 | strcat (cp, LIBTHREAD_DB_SO); | |
bccbefd2 | 921 | |
4dc84fd1 JK |
922 | if (!file_is_auto_load_safe (path, _("auto-load: Loading libthread-db " |
923 | "library \"%s\" from $pdir.\n"), | |
924 | path)) | |
bccbefd2 JK |
925 | result = 0; |
926 | else | |
927 | result = try_thread_db_load (path); | |
05386e9e TT |
928 | |
929 | do_cleanups (cleanup); | |
930 | return result; | |
290351b8 DE |
931 | } |
932 | ||
98a5dd13 | 933 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
934 | Look for libthread_db in directory(libpthread)/SUBDIR. |
935 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
936 | The result is true for success. */ |
937 | ||
938 | static int | |
e6712ff1 | 939 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
940 | { |
941 | struct objfile *obj; | |
942 | ||
bf88dd68 JK |
943 | if (!auto_load_thread_db) |
944 | return 0; | |
945 | ||
98a5dd13 | 946 | ALL_OBJFILES (obj) |
4262abfb | 947 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 948 | { |
e6712ff1 | 949 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
950 | return 1; |
951 | ||
952 | /* We may have found the separate-debug-info version of | |
953 | libpthread, and it may live in a directory without a matching | |
954 | libthread_db. */ | |
955 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
956 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
957 | subdir); | |
290351b8 | 958 | |
98a5dd13 DE |
959 | return 0; |
960 | } | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
965 | /* Handle $sdir in libthread-db-search-path. | |
966 | Look for libthread_db in the system dirs, or wherever a plain | |
967 | dlopen(file_without_path) will look. | |
968 | The result is true for success. */ | |
969 | ||
970 | static int | |
971 | try_thread_db_load_from_sdir (void) | |
972 | { | |
973 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
974 | } | |
975 | ||
976 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
977 | The result is true for success. */ | |
978 | ||
979 | static int | |
980 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
981 | { | |
05386e9e TT |
982 | struct cleanup *cleanup; |
983 | char *path; | |
984 | int result; | |
98a5dd13 | 985 | |
bf88dd68 JK |
986 | if (!auto_load_thread_db) |
987 | return 0; | |
988 | ||
05386e9e TT |
989 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
990 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
991 | |
992 | memcpy (path, dir, dir_len); | |
993 | path[dir_len] = '/'; | |
994 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
bccbefd2 | 995 | |
4dc84fd1 JK |
996 | if (!file_is_auto_load_safe (path, _("auto-load: Loading libthread-db " |
997 | "library \"%s\" from explicit " | |
998 | "directory.\n"), | |
999 | path)) | |
bccbefd2 JK |
1000 | result = 0; |
1001 | else | |
1002 | result = try_thread_db_load (path); | |
05386e9e TT |
1003 | |
1004 | do_cleanups (cleanup); | |
1005 | return result; | |
98a5dd13 DE |
1006 | } |
1007 | ||
17a37d48 | 1008 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1009 | to work on current inferior. |
1010 | The result is true for success. */ | |
17a37d48 PP |
1011 | |
1012 | static int | |
1013 | thread_db_load_search (void) | |
1014 | { | |
e6712ff1 DE |
1015 | VEC (char_ptr) *dir_vec; |
1016 | struct cleanup *cleanups; | |
1017 | char *this_dir; | |
1018 | int i, rc = 0; | |
17a37d48 | 1019 | |
e6712ff1 DE |
1020 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
1021 | cleanups = make_cleanup_free_char_ptr_vec (dir_vec); | |
1022 | ||
1023 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
17a37d48 | 1024 | { |
e6712ff1 | 1025 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1026 | size_t this_dir_len; |
e0881a8e | 1027 | |
e6712ff1 | 1028 | this_dir_len = strlen (this_dir); |
17a37d48 | 1029 | |
e6712ff1 DE |
1030 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1031 | && (this_dir[pdir_len] == '\0' | |
1032 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1033 | { |
e6712ff1 | 1034 | char *subdir = NULL; |
1fc3cf4a TT |
1035 | struct cleanup *free_subdir_cleanup |
1036 | = make_cleanup (null_cleanup, NULL); | |
e6712ff1 DE |
1037 | |
1038 | if (this_dir[pdir_len] == '/') | |
98a5dd13 | 1039 | { |
e6712ff1 | 1040 | subdir = xmalloc (strlen (this_dir)); |
1fc3cf4a | 1041 | make_cleanup (xfree, subdir); |
e6712ff1 | 1042 | strcpy (subdir, this_dir + pdir_len + 1); |
98a5dd13 | 1043 | } |
e6712ff1 | 1044 | rc = try_thread_db_load_from_pdir (subdir); |
1fc3cf4a | 1045 | do_cleanups (free_subdir_cleanup); |
e6712ff1 DE |
1046 | if (rc) |
1047 | break; | |
17a37d48 | 1048 | } |
e6712ff1 | 1049 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1050 | { |
1051 | if (try_thread_db_load_from_sdir ()) | |
1052 | { | |
1053 | rc = 1; | |
1054 | break; | |
1055 | } | |
1056 | } | |
1057 | else | |
17a37d48 | 1058 | { |
98a5dd13 DE |
1059 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1060 | { | |
1061 | rc = 1; | |
1062 | break; | |
1063 | } | |
17a37d48 PP |
1064 | } |
1065 | } | |
98a5dd13 | 1066 | |
e6712ff1 | 1067 | do_cleanups (cleanups); |
98a5dd13 DE |
1068 | if (libthread_db_debug) |
1069 | printf_unfiltered (_("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1070 | return rc; |
1071 | } | |
1072 | ||
98a5dd13 DE |
1073 | /* Return non-zero if the inferior has a libpthread. */ |
1074 | ||
1075 | static int | |
1076 | has_libpthread (void) | |
1077 | { | |
1078 | struct objfile *obj; | |
1079 | ||
1080 | ALL_OBJFILES (obj) | |
4262abfb | 1081 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
1082 | return 1; |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
17a37d48 | 1087 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1088 | Return 1 on success. */ |
17a37d48 PP |
1089 | |
1090 | static int | |
1091 | thread_db_load (void) | |
1092 | { | |
d90e17a7 | 1093 | struct thread_db_info *info; |
17a37d48 | 1094 | |
dfd4cc63 | 1095 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
1096 | |
1097 | if (info != NULL) | |
17a37d48 PP |
1098 | return 1; |
1099 | ||
856d6f99 PA |
1100 | /* Don't attempt to use thread_db on executables not running |
1101 | yet. */ | |
1102 | if (!target_has_registers) | |
17a37d48 PP |
1103 | return 0; |
1104 | ||
1105 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1106 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1107 | return 0; |
1108 | ||
1109 | if (thread_db_load_search ()) | |
1110 | return 1; | |
1111 | ||
98a5dd13 DE |
1112 | /* We couldn't find a libthread_db. |
1113 | If the inferior has a libpthread warn the user. */ | |
1114 | if (has_libpthread ()) | |
1115 | { | |
1116 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1117 | " library, thread debugging will not be available.")); | |
1118 | return 0; | |
17a37d48 | 1119 | } |
98a5dd13 | 1120 | |
17a37d48 PP |
1121 | /* Either this executable isn't using libpthread at all, or it is |
1122 | statically linked. Since we can't easily distinguish these two cases, | |
1123 | no warning is issued. */ | |
1124 | return 0; | |
1125 | } | |
1126 | ||
fb0e1ba7 | 1127 | static void |
12b6a110 | 1128 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1129 | { |
21e1bee4 | 1130 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1131 | { |
1132 | td_thr_events_t events; | |
fb0e1ba7 | 1133 | |
12b6a110 PP |
1134 | /* Set the process wide mask saying we aren't interested in any |
1135 | events anymore. */ | |
21e1bee4 PP |
1136 | td_event_fillset (&events); |
1137 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1138 | } |
fb0e1ba7 | 1139 | |
d90e17a7 PA |
1140 | info->td_create_bp_addr = 0; |
1141 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1142 | } |
1143 | ||
1144 | static void | |
1145 | check_thread_signals (void) | |
1146 | { | |
21bf60fe | 1147 | if (!thread_signals) |
fb0e1ba7 MK |
1148 | { |
1149 | sigset_t mask; | |
1150 | int i; | |
1151 | ||
669211f5 | 1152 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1153 | sigemptyset (&thread_stop_set); |
1154 | sigemptyset (&thread_print_set); | |
1155 | ||
b9569773 | 1156 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1157 | { |
1158 | if (sigismember (&mask, i)) | |
1159 | { | |
2ea28649 | 1160 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1161 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1162 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1163 | sigaddset (&thread_print_set, i); |
1164 | thread_signals = 1; | |
1165 | } | |
1166 | } | |
1167 | } | |
fb0e1ba7 MK |
1168 | } |
1169 | ||
0ec9a092 DJ |
1170 | /* Check whether thread_db is usable. This function is called when |
1171 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1172 | and when new shared libraries are loaded into a running process. */ | |
1173 | ||
1174 | void | |
1175 | check_for_thread_db (void) | |
fb0e1ba7 | 1176 | { |
b5057acd | 1177 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1178 | if (!thread_db_load ()) |
b5057acd | 1179 | return; |
0ec9a092 DJ |
1180 | } |
1181 | ||
0838fb57 DE |
1182 | /* This function is called via the new_objfile observer. */ |
1183 | ||
0ec9a092 DJ |
1184 | static void |
1185 | thread_db_new_objfile (struct objfile *objfile) | |
1186 | { | |
d90e17a7 PA |
1187 | /* This observer must always be called with inferior_ptid set |
1188 | correctly. */ | |
1189 | ||
0838fb57 | 1190 | if (objfile != NULL |
fcb44371 | 1191 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1192 | loaded (and notified without successful thread_db initialization) |
fcb44371 JK |
1193 | the time observer_notify_new_objfile is called for the library itself. |
1194 | Static executables have their separate debug info loaded already | |
1195 | before the inferior has started. */ | |
1196 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1197 | /* Only check for thread_db if we loaded libpthread, |
1198 | or if this is the main symbol file. | |
1199 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1200 | a statically linked executable AND the symbol file is specified AFTER | |
1201 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1202 | For dynamically linked executables, libpthread can be near the end | |
1203 | of the list of shared libraries to load, and in an app of several | |
1204 | thousand shared libraries, this can otherwise be painful. */ | |
1205 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1206 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1207 | check_for_thread_db (); |
fb0e1ba7 MK |
1208 | } |
1209 | ||
0838fb57 DE |
1210 | /* This function is called via the inferior_created observer. |
1211 | This handles the case of debugging statically linked executables. */ | |
1212 | ||
1213 | static void | |
1214 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1215 | { | |
1216 | check_for_thread_db (); | |
1217 | } | |
1218 | ||
a2f23071 DJ |
1219 | /* Attach to a new thread. This function is called when we receive a |
1220 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1221 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1222 | |
02c6c942 | 1223 | static int |
39f77062 | 1224 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1225 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1226 | { |
17faa917 | 1227 | struct private_thread_info *private; |
2a2ef594 | 1228 | struct thread_info *tp; |
fb0e1ba7 | 1229 | td_err_e err; |
d90e17a7 | 1230 | struct thread_db_info *info; |
fb0e1ba7 | 1231 | |
a2f23071 DJ |
1232 | /* If we're being called after a TD_CREATE event, we may already |
1233 | know about this thread. There are two ways this can happen. We | |
1234 | may have iterated over all threads between the thread creation | |
1235 | and the TD_CREATE event, for instance when the user has issued | |
1236 | the `info threads' command before the SIGTRAP for hitting the | |
1237 | thread creation breakpoint was reported. Alternatively, the | |
1238 | thread may have exited and a new one been created with the same | |
1239 | thread ID. In the first case we don't need to do anything; in | |
1240 | the second case we should discard information about the dead | |
1241 | thread and attach to the new one. */ | |
2a2ef594 PA |
1242 | tp = find_thread_ptid (ptid); |
1243 | if (tp != NULL) | |
a2f23071 | 1244 | { |
17faa917 DJ |
1245 | /* If tp->private is NULL, then GDB is already attached to this |
1246 | thread, but we do not know anything about it. We can learn | |
1247 | about it here. This can only happen if we have some other | |
1248 | way besides libthread_db to notice new threads (i.e. | |
1249 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1250 | exit, so this can not be a stale thread recreated with the | |
1251 | same ID. */ | |
1252 | if (tp->private != NULL) | |
1253 | { | |
1254 | if (!tp->private->dying) | |
02c6c942 | 1255 | return 0; |
a2f23071 | 1256 | |
17faa917 DJ |
1257 | delete_thread (ptid); |
1258 | tp = NULL; | |
1259 | } | |
a2f23071 DJ |
1260 | } |
1261 | ||
856d6f99 PA |
1262 | if (target_has_execution) |
1263 | check_thread_signals (); | |
fb0e1ba7 | 1264 | |
9ee57c33 | 1265 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
856d6f99 | 1266 | if (target_has_execution |
84636d28 PA |
1267 | && tp == NULL) |
1268 | { | |
1269 | int res; | |
1270 | ||
dfd4cc63 LM |
1271 | res = lin_lwp_attach_lwp (ptid_build (ptid_get_pid (ptid), |
1272 | ti_p->ti_lid, 0)); | |
84636d28 PA |
1273 | if (res < 0) |
1274 | { | |
1275 | /* Error, stop iterating. */ | |
1276 | return 0; | |
1277 | } | |
1278 | else if (res > 0) | |
1279 | { | |
1280 | /* Pretend this thread doesn't exist yet, and keep | |
1281 | iterating. */ | |
1282 | return 1; | |
1283 | } | |
1284 | ||
1285 | /* Otherwise, we sucessfully attached to the thread. */ | |
1286 | } | |
9ee57c33 | 1287 | |
17faa917 DJ |
1288 | /* Construct the thread's private data. */ |
1289 | private = xmalloc (sizeof (struct private_thread_info)); | |
1290 | memset (private, 0, sizeof (struct private_thread_info)); | |
1291 | ||
1292 | /* A thread ID of zero may mean the thread library has not initialized | |
1293 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1294 | if we change GDB to always have at least one thread in the thread | |
1295 | list this will have to go somewhere else; maybe private == NULL | |
1296 | until the thread_db target claims it. */ | |
1297 | gdb_assert (ti_p->ti_tid != 0); | |
1298 | private->th = *th_p; | |
1299 | private->tid = ti_p->ti_tid; | |
64776a0b PA |
1300 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
1301 | private->dying = 1; | |
17faa917 | 1302 | |
fb0e1ba7 | 1303 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1304 | if (tp == NULL) |
2e456570 | 1305 | add_thread_with_info (ptid, private); |
17faa917 DJ |
1306 | else |
1307 | tp->private = private; | |
5365276c | 1308 | |
dfd4cc63 | 1309 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1310 | |
856d6f99 PA |
1311 | /* Enable thread event reporting for this thread, except when |
1312 | debugging a core file. */ | |
1313 | if (target_has_execution) | |
1314 | { | |
1315 | err = info->td_thr_event_enable_p (th_p, 1); | |
1316 | if (err != TD_OK) | |
1317 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1318 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1319 | } | |
1320 | ||
02c6c942 | 1321 | return 1; |
fb0e1ba7 MK |
1322 | } |
1323 | ||
1324 | static void | |
17faa917 | 1325 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1326 | { |
a2f23071 DJ |
1327 | struct thread_info *thread_info; |
1328 | ||
a2f23071 DJ |
1329 | /* Don't delete the thread now, because it still reports as active |
1330 | until it has executed a few instructions after the event | |
1331 | breakpoint - if we deleted it now, "info threads" would cause us | |
1332 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1333 | event. This means that we won't delete it from our thread list | |
1334 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1335 | something re-uses its thread ID. We'll report the thread exit |
1336 | when the underlying LWP dies. */ | |
e09875d4 | 1337 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1338 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1339 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1340 | } |
1341 | ||
1342 | static void | |
136d6dae | 1343 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1344 | { |
117de6a9 | 1345 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1346 | struct thread_db_info *info; |
117de6a9 | 1347 | |
dfd4cc63 | 1348 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
c194fbe1 | 1349 | |
d90e17a7 PA |
1350 | if (info) |
1351 | { | |
856d6f99 PA |
1352 | if (target_has_execution) |
1353 | { | |
1354 | disable_thread_event_reporting (info); | |
1355 | ||
1356 | /* Delete the old thread event breakpoints. Note that | |
1357 | unlike when mourning, we can remove them here because | |
1358 | there's still a live inferior to poke at. In any case, | |
1359 | GDB will not try to insert anything in the inferior when | |
1360 | removing a breakpoint. */ | |
1361 | remove_thread_event_breakpoints (); | |
1362 | } | |
d90e17a7 | 1363 | |
dfd4cc63 | 1364 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 | 1365 | } |
4105de34 | 1366 | |
7a7d3353 | 1367 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1368 | |
1369 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1370 | ||
1371 | /* If there are no more processes using libpthread, detach the | |
1372 | thread_db target ops. */ | |
1373 | if (!thread_db_list) | |
1374 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1375 | } |
1376 | ||
fb0e1ba7 MK |
1377 | /* Check if PID is currently stopped at the location of a thread event |
1378 | breakpoint location. If it is, read the event message and act upon | |
1379 | the event. */ | |
1380 | ||
1381 | static void | |
39f77062 | 1382 | check_event (ptid_t ptid) |
fb0e1ba7 | 1383 | { |
515630c5 UW |
1384 | struct regcache *regcache = get_thread_regcache (ptid); |
1385 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1386 | td_event_msg_t msg; |
1387 | td_thrinfo_t ti; | |
1388 | td_err_e err; | |
1389 | CORE_ADDR stop_pc; | |
4d9850d3 | 1390 | int loop = 0; |
d90e17a7 PA |
1391 | struct thread_db_info *info; |
1392 | ||
dfd4cc63 | 1393 | info = get_thread_db_info (ptid_get_pid (ptid)); |
fb0e1ba7 MK |
1394 | |
1395 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1396 | stop_pc = regcache_read_pc (regcache) |
1397 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1398 | if (stop_pc != info->td_create_bp_addr |
1399 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1400 | return; |
1401 | ||
4c28f408 | 1402 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1403 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1404 | |
1405 | /* If we have only looked at the first thread before libpthread was | |
1406 | initialized, we may not know its thread ID yet. Make sure we do | |
1407 | before we add another thread to the list. */ | |
d90e17a7 PA |
1408 | if (!have_threads (ptid)) |
1409 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1410 | |
4d9850d3 JJ |
1411 | /* If we are at a create breakpoint, we do not know what new lwp |
1412 | was created and cannot specifically locate the event message for it. | |
1413 | We have to call td_ta_event_getmsg() to get | |
1414 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1415 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1416 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1417 | This guarantees we will process the correct message before continuing |
1418 | from the breakpoint. | |
4d9850d3 JJ |
1419 | |
1420 | Currently, death events are not enabled. If they are enabled, | |
1421 | the death event can use the td_thr_event_getmsg() interface to | |
1422 | get the message specifically for that lwp and avoid looping | |
1423 | below. */ | |
1424 | ||
1425 | loop = 1; | |
1426 | ||
1427 | do | |
fb0e1ba7 | 1428 | { |
d90e17a7 | 1429 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1430 | if (err != TD_OK) |
1431 | { | |
1432 | if (err == TD_NOMSG) | |
1433 | return; | |
fb0e1ba7 | 1434 | |
8a3fe4f8 | 1435 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1436 | thread_db_err_str (err)); |
1437 | } | |
fb0e1ba7 | 1438 | |
d90e17a7 | 1439 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1440 | if (err != TD_OK) |
8a3fe4f8 | 1441 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1442 | |
dfd4cc63 | 1443 | ptid = ptid_build (ptid_get_pid (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1444 | |
4d9850d3 JJ |
1445 | switch (msg.event) |
1446 | { | |
1447 | case TD_CREATE: | |
a2f23071 DJ |
1448 | /* Call attach_thread whether or not we already know about a |
1449 | thread with this thread ID. */ | |
93815fbf | 1450 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1451 | |
4d9850d3 | 1452 | break; |
fb0e1ba7 | 1453 | |
4d9850d3 | 1454 | case TD_DEATH: |
fb0e1ba7 | 1455 | |
4d9850d3 | 1456 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1457 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1458 | |
17faa917 | 1459 | detach_thread (ptid); |
fb0e1ba7 | 1460 | |
4d9850d3 | 1461 | break; |
fb0e1ba7 | 1462 | |
4d9850d3 | 1463 | default: |
8a3fe4f8 | 1464 | error (_("Spurious thread event.")); |
4d9850d3 | 1465 | } |
fb0e1ba7 | 1466 | } |
4d9850d3 | 1467 | while (loop); |
fb0e1ba7 MK |
1468 | } |
1469 | ||
39f77062 | 1470 | static ptid_t |
117de6a9 | 1471 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1472 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1473 | int options) | |
fb0e1ba7 | 1474 | { |
d90e17a7 | 1475 | struct thread_db_info *info; |
117de6a9 PA |
1476 | struct target_ops *beneath = find_target_beneath (ops); |
1477 | ||
47608cb1 | 1478 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1479 | |
b84876c2 PA |
1480 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1481 | return ptid; | |
1482 | ||
1111f4aa | 1483 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1484 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1485 | return ptid; | |
fb0e1ba7 | 1486 | |
dfd4cc63 | 1487 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1488 | |
1489 | /* If this process isn't using thread_db, we're done. */ | |
1490 | if (info == NULL) | |
1491 | return ptid; | |
1492 | ||
3f64f7b1 DJ |
1493 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1494 | { | |
d90e17a7 PA |
1495 | /* New image, it may or may not end up using thread_db. Assume |
1496 | not unless we find otherwise. */ | |
dfd4cc63 | 1497 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1498 | if (!thread_db_list) |
1499 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1500 | |
6c95b8df PA |
1501 | /* Thread event breakpoints are deleted by |
1502 | update_breakpoints_after_exec. */ | |
1503 | ||
49fd4a42 | 1504 | return ptid; |
3f64f7b1 DJ |
1505 | } |
1506 | ||
4105de34 DJ |
1507 | /* If we do not know about the main thread yet, this would be a good time to |
1508 | find it. */ | |
d90e17a7 PA |
1509 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1510 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1511 | |
fb0e1ba7 | 1512 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
a493e3e2 | 1513 | && ourstatus->value.sig == GDB_SIGNAL_TRAP) |
fb0e1ba7 | 1514 | /* Check for a thread event. */ |
39f77062 | 1515 | check_event (ptid); |
fb0e1ba7 | 1516 | |
d90e17a7 | 1517 | if (have_threads (ptid)) |
4105de34 | 1518 | { |
64776a0b PA |
1519 | /* Fill in the thread's user-level thread id. */ |
1520 | thread_from_lwp (ptid); | |
4105de34 | 1521 | } |
fb0e1ba7 | 1522 | |
b9b5d7ea | 1523 | return ptid; |
fb0e1ba7 MK |
1524 | } |
1525 | ||
fb0e1ba7 | 1526 | static void |
136d6dae | 1527 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1528 | { |
117de6a9 PA |
1529 | struct target_ops *target_beneath = find_target_beneath (ops); |
1530 | ||
dfd4cc63 | 1531 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1532 | |
d90e17a7 PA |
1533 | target_beneath->to_mourn_inferior (target_beneath); |
1534 | ||
6c95b8df PA |
1535 | /* Delete the old thread event breakpoints. Do this after mourning |
1536 | the inferior, so that we don't try to uninsert them. */ | |
1537 | remove_thread_event_breakpoints (); | |
1538 | ||
b26a6851 | 1539 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1540 | if (!thread_db_list) |
1541 | unpush_target (ops); | |
fb0e1ba7 MK |
1542 | } |
1543 | ||
02c6c942 PP |
1544 | struct callback_data |
1545 | { | |
1546 | struct thread_db_info *info; | |
1547 | int new_threads; | |
1548 | }; | |
1549 | ||
fb0e1ba7 MK |
1550 | static int |
1551 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1552 | { | |
1553 | td_thrinfo_t ti; | |
1554 | td_err_e err; | |
39f77062 | 1555 | ptid_t ptid; |
403fe197 | 1556 | struct thread_info *tp; |
02c6c942 PP |
1557 | struct callback_data *cb_data = data; |
1558 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1559 | |
d90e17a7 | 1560 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1561 | if (err != TD_OK) |
8a3fe4f8 | 1562 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1563 | thread_db_err_str (err)); |
fb0e1ba7 | 1564 | |
254f582e | 1565 | if (ti.ti_tid == 0) |
4105de34 DJ |
1566 | { |
1567 | /* A thread ID of zero means that this is the main thread, but | |
1568 | glibc has not yet initialized thread-local storage and the | |
1569 | pthread library. We do not know what the thread's TID will | |
1570 | be yet. Just enable event reporting and otherwise ignore | |
1571 | it. */ | |
1572 | ||
4d062f1a PA |
1573 | /* In that case, we're not stopped in a fork syscall and don't |
1574 | need this glibc bug workaround. */ | |
1575 | info->need_stale_parent_threads_check = 0; | |
1576 | ||
254f582e JK |
1577 | if (target_has_execution) |
1578 | { | |
1579 | err = info->td_thr_event_enable_p (th_p, 1); | |
1580 | if (err != TD_OK) | |
1581 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1582 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1583 | } | |
4105de34 DJ |
1584 | |
1585 | return 0; | |
1586 | } | |
1587 | ||
4d062f1a PA |
1588 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1589 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1590 | avoid doing the work if we know we don't have to. */ | |
1591 | if (info->need_stale_parent_threads_check) | |
1592 | { | |
1593 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1594 | |
4d062f1a PA |
1595 | if (tgid != -1 && tgid != info->pid) |
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1600 | tp = find_thread_ptid (ptid); |
403fe197 | 1601 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1602 | { |
1603 | if (attach_thread (ptid, th_p, &ti)) | |
1604 | cb_data->new_threads += 1; | |
1605 | else | |
1606 | /* Problem attaching this thread; perhaps it exited before we | |
1607 | could attach it? | |
1608 | This could mean that the thread list inside glibc itself is in | |
1609 | inconsistent state, and libthread_db could go on looping forever | |
1610 | (observed with glibc-2.3.6). To prevent that, terminate | |
1611 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1612 | return 1; | |
1613 | } | |
fb0e1ba7 MK |
1614 | |
1615 | return 0; | |
1616 | } | |
1617 | ||
02c6c942 PP |
1618 | /* Helper for thread_db_find_new_threads_2. |
1619 | Returns number of new threads found. */ | |
1620 | ||
1621 | static int | |
1622 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1623 | td_err_e *errp) |
02c6c942 PP |
1624 | { |
1625 | volatile struct gdb_exception except; | |
1626 | struct callback_data data; | |
fb169834 | 1627 | td_err_e err = TD_ERR; |
02c6c942 PP |
1628 | |
1629 | data.info = info; | |
1630 | data.new_threads = 0; | |
1631 | ||
1632 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1633 | { | |
1634 | /* Iterate over all user-space threads to discover new threads. */ | |
1635 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1636 | find_new_threads_callback, | |
1637 | &data, | |
1638 | TD_THR_ANY_STATE, | |
1639 | TD_THR_LOWEST_PRIORITY, | |
1640 | TD_SIGNO_MASK, | |
1641 | TD_THR_ANY_USER_FLAGS); | |
1642 | } | |
1643 | ||
02d868e8 | 1644 | if (libthread_db_debug) |
02c6c942 PP |
1645 | { |
1646 | if (except.reason < 0) | |
1647 | exception_fprintf (gdb_stderr, except, | |
1648 | "Warning: find_new_threads_once: "); | |
1649 | ||
1650 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1651 | data.new_threads, iteration); | |
1652 | } | |
1653 | ||
1654 | if (errp != NULL) | |
1655 | *errp = err; | |
1656 | ||
1657 | return data.new_threads; | |
1658 | } | |
1659 | ||
4c28f408 | 1660 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1661 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1662 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1663 | |
fb0e1ba7 | 1664 | static void |
02c6c942 | 1665 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1666 | { |
fcb44371 | 1667 | td_err_e err = TD_OK; |
d90e17a7 | 1668 | struct thread_db_info *info; |
02c6c942 | 1669 | int i, loop; |
4c28f408 | 1670 | |
dfd4cc63 | 1671 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1672 | |
4c28f408 | 1673 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1674 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1675 | |
1676 | if (until_no_new) | |
1677 | { | |
1678 | /* Require 4 successive iterations which do not find any new threads. | |
1679 | The 4 is a heuristic: there is an inherent race here, and I have | |
1680 | seen that 2 iterations in a row are not always sufficient to | |
1681 | "capture" all threads. */ | |
fcb44371 JK |
1682 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1683 | if (find_new_threads_once (info, i, &err) != 0) | |
1684 | { | |
1685 | /* Found some new threads. Restart the loop from beginning. */ | |
1686 | loop = -1; | |
1687 | } | |
02c6c942 PP |
1688 | } |
1689 | else | |
fcb44371 JK |
1690 | find_new_threads_once (info, 0, &err); |
1691 | ||
1692 | if (err != TD_OK) | |
1693 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1694 | } |
1695 | ||
02c6c942 PP |
1696 | static void |
1697 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1698 | { | |
1699 | thread_db_find_new_threads_2 (ptid, 0); | |
1700 | } | |
1701 | ||
dc146f7c VP |
1702 | static int |
1703 | update_thread_core (struct lwp_info *info, void *closure) | |
1704 | { | |
2e794194 | 1705 | info->core = linux_common_core_of_thread (info->ptid); |
dc146f7c VP |
1706 | return 0; |
1707 | } | |
02c6c942 | 1708 | |
28439f5e PA |
1709 | static void |
1710 | thread_db_find_new_threads (struct target_ops *ops) | |
1711 | { | |
d90e17a7 | 1712 | struct thread_db_info *info; |
c65b3e0d | 1713 | struct inferior *inf; |
d90e17a7 | 1714 | |
c65b3e0d PA |
1715 | ALL_INFERIORS (inf) |
1716 | { | |
1717 | struct thread_info *thread; | |
d90e17a7 | 1718 | |
c65b3e0d PA |
1719 | if (inf->pid == 0) |
1720 | continue; | |
d90e17a7 | 1721 | |
c65b3e0d PA |
1722 | info = get_thread_db_info (inf->pid); |
1723 | if (info == NULL) | |
1724 | continue; | |
1725 | ||
1726 | thread = any_live_thread_of_process (inf->pid); | |
1727 | if (thread == NULL || thread->executing) | |
1728 | continue; | |
1729 | ||
1730 | thread_db_find_new_threads_1 (thread->ptid); | |
1731 | } | |
dc146f7c | 1732 | |
856d6f99 PA |
1733 | if (target_has_execution) |
1734 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1735 | update_thread_core, NULL); | |
28439f5e PA |
1736 | } |
1737 | ||
fb0e1ba7 | 1738 | static char * |
117de6a9 | 1739 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1740 | { |
e09875d4 | 1741 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1742 | struct target_ops *beneath; |
17faa917 DJ |
1743 | |
1744 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1745 | { |
1746 | static char buf[64]; | |
17faa917 | 1747 | thread_t tid; |
fb0e1ba7 | 1748 | |
17faa917 | 1749 | tid = thread_info->private->tid; |
17faa917 | 1750 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
dfd4cc63 | 1751 | tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1752 | |
1753 | return buf; | |
1754 | } | |
1755 | ||
117de6a9 PA |
1756 | beneath = find_target_beneath (ops); |
1757 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1758 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1759 | |
39f77062 | 1760 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1761 | } |
1762 | ||
28b17333 DJ |
1763 | /* Return a string describing the state of the thread specified by |
1764 | INFO. */ | |
1765 | ||
1766 | static char * | |
1767 | thread_db_extra_thread_info (struct thread_info *info) | |
1768 | { | |
17faa917 DJ |
1769 | if (info->private == NULL) |
1770 | return NULL; | |
1771 | ||
28b17333 DJ |
1772 | if (info->private->dying) |
1773 | return "Exiting"; | |
1774 | ||
1775 | return NULL; | |
1776 | } | |
1777 | ||
b2756930 KB |
1778 | /* Get the address of the thread local variable in load module LM which |
1779 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1780 | |
1781 | static CORE_ADDR | |
117de6a9 PA |
1782 | thread_db_get_thread_local_address (struct target_ops *ops, |
1783 | ptid_t ptid, | |
b2756930 | 1784 | CORE_ADDR lm, |
b4acd559 | 1785 | CORE_ADDR offset) |
3f47be5c | 1786 | { |
17faa917 | 1787 | struct thread_info *thread_info; |
117de6a9 | 1788 | struct target_ops *beneath; |
17faa917 | 1789 | |
4105de34 | 1790 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1791 | if (!have_threads (ptid)) |
1792 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1793 | |
17faa917 | 1794 | /* Find the matching thread. */ |
e09875d4 | 1795 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1796 | |
17faa917 | 1797 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1798 | { |
3f47be5c | 1799 | td_err_e err; |
00f515da | 1800 | psaddr_t address; |
d90e17a7 PA |
1801 | struct thread_db_info *info; |
1802 | ||
dfd4cc63 | 1803 | info = get_thread_db_info (ptid_get_pid (ptid)); |
3f47be5c EZ |
1804 | |
1805 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1806 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1807 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1808 | _("No TLS library support")); | |
3f47be5c | 1809 | |
b2756930 KB |
1810 | /* Caller should have verified that lm != 0. */ |
1811 | gdb_assert (lm != 0); | |
3f47be5c | 1812 | |
3f47be5c | 1813 | /* Finally, get the address of the variable. */ |
00f515da DE |
1814 | /* Note the cast through uintptr_t: this interface only works if |
1815 | a target address fits in a psaddr_t, which is a host pointer. | |
1816 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
d90e17a7 | 1817 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
00f515da | 1818 | (psaddr_t)(uintptr_t) lm, |
d90e17a7 | 1819 | offset, &address); |
3f47be5c EZ |
1820 | |
1821 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1822 | /* The memory hasn't been allocated, yet. */ | |
1823 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1824 | /* Now, if libthread_db provided the initialization image's |
1825 | address, we *could* try to build a non-lvalue value from | |
1826 | the initialization image. */ | |
109c3e39 AC |
1827 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1828 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1829 | #endif |
1830 | ||
1831 | /* Something else went wrong. */ | |
1832 | if (err != TD_OK) | |
109c3e39 AC |
1833 | throw_error (TLS_GENERIC_ERROR, |
1834 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1835 | |
1836 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1837 | /* Do proper sign extension for the target. */ |
1838 | gdb_assert (exec_bfd); | |
1839 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1840 | ? (CORE_ADDR) (intptr_t) address | |
1841 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1842 | } |
1843 | ||
117de6a9 PA |
1844 | beneath = find_target_beneath (ops); |
1845 | if (beneath->to_get_thread_local_address) | |
1846 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1847 | else |
109c3e39 AC |
1848 | throw_error (TLS_GENERIC_ERROR, |
1849 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1850 | } |
1851 | ||
0ef643c8 JB |
1852 | /* Callback routine used to find a thread based on the TID part of |
1853 | its PTID. */ | |
1854 | ||
1855 | static int | |
1856 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1857 | { | |
1858 | long *tid = (long *) data; | |
1859 | ||
1860 | if (thread->private->tid == *tid) | |
1861 | return 1; | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1867 | ||
1868 | static ptid_t | |
1869 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1870 | { | |
1871 | struct thread_info *thread_info; | |
1872 | ||
d90e17a7 | 1873 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1874 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1875 | ||
1876 | gdb_assert (thread_info != NULL); | |
1877 | ||
1878 | return (thread_info->ptid); | |
1879 | } | |
1880 | ||
4d062f1a PA |
1881 | static void |
1882 | thread_db_resume (struct target_ops *ops, | |
2ea28649 | 1883 | ptid_t ptid, int step, enum gdb_signal signo) |
4d062f1a PA |
1884 | { |
1885 | struct target_ops *beneath = find_target_beneath (ops); | |
1886 | struct thread_db_info *info; | |
1887 | ||
1888 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1889 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1890 | else |
dfd4cc63 | 1891 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1892 | |
1893 | /* This workaround is only needed for child fork lwps stopped in a | |
1894 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1895 | workaround can be disabled. */ | |
1896 | if (info) | |
1897 | info->need_stale_parent_threads_check = 0; | |
1898 | ||
1899 | beneath->to_resume (beneath, ptid, step, signo); | |
1900 | } | |
1901 | ||
bf88dd68 JK |
1902 | /* qsort helper function for info_auto_load_libthread_db, sort the |
1903 | thread_db_info pointers primarily by their FILENAME and secondarily by their | |
1904 | PID, both in ascending order. */ | |
1905 | ||
1906 | static int | |
1907 | info_auto_load_libthread_db_compare (const void *ap, const void *bp) | |
1908 | { | |
1909 | struct thread_db_info *a = *(struct thread_db_info **) ap; | |
1910 | struct thread_db_info *b = *(struct thread_db_info **) bp; | |
1911 | int retval; | |
1912 | ||
1913 | retval = strcmp (a->filename, b->filename); | |
1914 | if (retval) | |
1915 | return retval; | |
1916 | ||
1917 | return (a->pid > b->pid) - (a->pid - b->pid); | |
1918 | } | |
1919 | ||
1920 | /* Implement 'info auto-load libthread-db'. */ | |
1921 | ||
1922 | static void | |
1923 | info_auto_load_libthread_db (char *args, int from_tty) | |
1924 | { | |
1925 | struct ui_out *uiout = current_uiout; | |
1926 | const char *cs = args ? args : ""; | |
1927 | struct thread_db_info *info, **array; | |
1928 | unsigned info_count, unique_filenames; | |
1929 | size_t max_filename_len, max_pids_len, pids_len; | |
1930 | struct cleanup *back_to; | |
1931 | char *pids; | |
1932 | int i; | |
1933 | ||
529480d0 | 1934 | cs = skip_spaces_const (cs); |
bf88dd68 JK |
1935 | if (*cs) |
1936 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1937 | ||
1938 | info_count = 0; | |
1939 | for (info = thread_db_list; info; info = info->next) | |
1940 | if (info->filename != NULL) | |
1941 | info_count++; | |
1942 | ||
1943 | array = xmalloc (sizeof (*array) * info_count); | |
1944 | back_to = make_cleanup (xfree, array); | |
1945 | ||
1946 | info_count = 0; | |
1947 | for (info = thread_db_list; info; info = info->next) | |
1948 | if (info->filename != NULL) | |
1949 | array[info_count++] = info; | |
1950 | ||
1951 | /* Sort ARRAY by filenames and PIDs. */ | |
1952 | ||
1953 | qsort (array, info_count, sizeof (*array), | |
1954 | info_auto_load_libthread_db_compare); | |
1955 | ||
1956 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1957 | length of PIDs list for the unique filenames (columns). */ | |
1958 | ||
1959 | unique_filenames = 0; | |
1960 | max_filename_len = 0; | |
1961 | max_pids_len = 0; | |
1962 | pids_len = 0; | |
1963 | for (i = 0; i < info_count; i++) | |
1964 | { | |
1965 | int pid = array[i]->pid; | |
1966 | size_t this_pid_len; | |
1967 | ||
1968 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1969 | this_pid_len++; | |
1970 | ||
1971 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1972 | { | |
1973 | unique_filenames++; | |
1974 | max_filename_len = max (max_filename_len, | |
1975 | strlen (array[i]->filename)); | |
1976 | ||
1977 | if (i > 0) | |
1978 | { | |
1979 | pids_len -= strlen (", "); | |
1980 | max_pids_len = max (max_pids_len, pids_len); | |
1981 | } | |
1982 | pids_len = 0; | |
1983 | } | |
1984 | pids_len += this_pid_len + strlen (", "); | |
1985 | } | |
1986 | if (i) | |
1987 | { | |
1988 | pids_len -= strlen (", "); | |
1989 | max_pids_len = max (max_pids_len, pids_len); | |
1990 | } | |
1991 | ||
1992 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1993 | its columns. */ | |
1994 | if (info_count > 0 && args == auto_load_info_scripts_pattern_nl) | |
1995 | ui_out_text (uiout, "\n"); | |
1996 | ||
1997 | make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames, | |
1998 | "LinuxThreadDbTable"); | |
1999 | ||
2000 | ui_out_table_header (uiout, max_filename_len, ui_left, "filename", | |
2001 | "Filename"); | |
2002 | ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids"); | |
2003 | ui_out_table_body (uiout); | |
2004 | ||
2005 | pids = xmalloc (max_pids_len + 1); | |
2006 | make_cleanup (xfree, pids); | |
2007 | ||
2008 | /* Note I is incremented inside the cycle, not at its end. */ | |
2009 | for (i = 0; i < info_count;) | |
2010 | { | |
2011 | struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); | |
2012 | char *pids_end; | |
2013 | ||
2014 | info = array[i]; | |
2015 | ui_out_field_string (uiout, "filename", info->filename); | |
2016 | pids_end = pids; | |
2017 | ||
2018 | while (i < info_count && strcmp (info->filename, array[i]->filename) == 0) | |
2019 | { | |
2020 | if (pids_end != pids) | |
2021 | { | |
2022 | *pids_end++ = ','; | |
2023 | *pids_end++ = ' '; | |
2024 | } | |
2025 | pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end, | |
2026 | "%u", array[i]->pid); | |
2027 | gdb_assert (pids_end < &pids[max_pids_len + 1]); | |
2028 | ||
2029 | i++; | |
2030 | } | |
2031 | *pids_end = '\0'; | |
2032 | ||
2033 | ui_out_field_string (uiout, "pids", pids); | |
2034 | ||
2035 | ui_out_text (uiout, "\n"); | |
2036 | do_cleanups (chain); | |
2037 | } | |
2038 | ||
2039 | do_cleanups (back_to); | |
2040 | ||
2041 | if (info_count == 0) | |
2042 | ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n")); | |
2043 | } | |
2044 | ||
fb0e1ba7 MK |
2045 | static void |
2046 | init_thread_db_ops (void) | |
2047 | { | |
2048 | thread_db_ops.to_shortname = "multi-thread"; | |
2049 | thread_db_ops.to_longname = "multi-threaded child process."; | |
2050 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
2051 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 2052 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 2053 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 2054 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
2055 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
2056 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
2057 | thread_db_ops.to_stratum = thread_stratum; | |
2058 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
2059 | thread_db_ops.to_get_thread_local_address |
2060 | = thread_db_get_thread_local_address; | |
28b17333 | 2061 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 2062 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 | 2063 | thread_db_ops.to_magic = OPS_MAGIC; |
c22a2b88 TT |
2064 | |
2065 | complete_target_initialization (&thread_db_ops); | |
fb0e1ba7 MK |
2066 | } |
2067 | ||
2c0b251b PA |
2068 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
2069 | extern initialize_file_ftype _initialize_thread_db; | |
2070 | ||
fb0e1ba7 MK |
2071 | void |
2072 | _initialize_thread_db (void) | |
2073 | { | |
17a37d48 | 2074 | init_thread_db_ops (); |
17a37d48 PP |
2075 | |
2076 | /* Defer loading of libthread_db.so until inferior is running. | |
2077 | This allows gdb to load correct libthread_db for a given | |
2078 | executable -- there could be mutiple versions of glibc, | |
2079 | compiled with LinuxThreads or NPTL, and until there is | |
2080 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 2081 | the correct one to load. */ |
17a37d48 PP |
2082 | |
2083 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
2084 | ||
2085 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
2086 | class_support, | |
2087 | &libthread_db_search_path, _("\ | |
2088 | Set search path for libthread_db."), _("\ | |
2089 | Show the current search path or libthread_db."), _("\ | |
2090 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
2091 | gdb itself.\n\ |
2092 | Its value is a colon (':') separate list of directories to search.\n\ | |
2093 | Setting the search path to an empty list resets it to its default value."), | |
2094 | set_libthread_db_search_path, | |
17a37d48 PP |
2095 | NULL, |
2096 | &setlist, &showlist); | |
02d868e8 | 2097 | |
ccce17b0 YQ |
2098 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
2099 | &libthread_db_debug, _("\ | |
02d868e8 PP |
2100 | Set libthread-db debugging."), _("\ |
2101 | Show libthread-db debugging."), _("\ | |
2102 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
2103 | NULL, |
2104 | show_libthread_db_debug, | |
2105 | &setdebuglist, &showdebuglist); | |
02d868e8 | 2106 | |
bf88dd68 JK |
2107 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2108 | &auto_load_thread_db, _("\ | |
2109 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2110 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2111 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2112 | locations to load libthread_db compatible with the inferior.\n\ | |
2113 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
2114 | This options has security implications for untrusted inferiors."), | |
2115 | NULL, show_auto_load_thread_db, | |
2116 | auto_load_set_cmdlist_get (), | |
2117 | auto_load_show_cmdlist_get ()); | |
2118 | ||
2119 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2120 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2121 | Usage: info auto-load libthread-db"), | |
2122 | auto_load_info_cmdlist_get ()); | |
2123 | ||
17a37d48 PP |
2124 | /* Add ourselves to objfile event chain. */ |
2125 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
2126 | |
2127 | /* Add ourselves to inferior_created event chain. | |
2128 | This is needed to handle debugging statically linked programs where | |
2129 | the new_objfile observer won't get called for libpthread. */ | |
2130 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 2131 | } |