Add target_ops argument to to_program_signals
[deliverable/binutils-gdb.git] / gdb / linux-thread-db.c
CommitLineData
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"
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"
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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
76static 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. */
80static int auto_load_thread_db = 1;
81
82/* "show" command for the auto_load_thread_db configuration variable. */
83
84static void
85show_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
93static void
94set_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 106static unsigned int libthread_db_debug;
02d868e8
PP
107
108static void
109show_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
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MK
118/* This module's target vector. */
119static struct target_ops thread_db_ops;
120
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MK
121/* Non-zero if we have determined the signals used by the threads
122 library. */
123static int thread_signals;
124static sigset_t thread_stop_set;
125static sigset_t thread_print_set;
126
d90e17a7
PA
127struct 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. */
203struct thread_db_info *thread_db_list;
204
205static void thread_db_find_new_threads_1 (ptid_t ptid);
02c6c942 206static 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
213static struct thread_db_info *
214add_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
236static struct thread_db_info *
237get_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
253static void
254delete_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
281static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
282 const td_thrinfo_t *ti_p);
17faa917 283static 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
289struct 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
300static char *
301thread_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
370static int
d90e17a7 371have_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
381static int
d90e17a7 382have_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
389struct 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
405static int
d90e17a7 406thread_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 442static void
39f77062 443thread_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. */
477int
478thread_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
520static void *
521verbose_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 530static td_err_e
d90e17a7 531enable_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, &notify);
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 &current_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
565static int
566inferior_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
592static void
593enable_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
660static int
456b0e24
PP
661thread_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
707static const char *
708dladdr_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
723static int
d90e17a7 724try_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
840static int
fde4f8ed 841try_thread_db_load (const char *library, int check_auto_load_safe)
17a37d48
PP
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);
fde4f8ed
JK
849
850 if (check_auto_load_safe)
851 {
852 if (access (library, R_OK) != 0)
853 {
854 /* Do not print warnings by file_is_auto_load_safe if the library does
855 not exist at this place. */
856 if (libthread_db_debug)
857 printf_unfiltered (_("open failed: %s.\n"), safe_strerror (errno));
858 return 0;
859 }
860
861 if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db "
862 "library \"%s\" from explicit "
863 "directory.\n"),
864 library))
865 return 0;
866 }
867
17a37d48
PP
868 handle = dlopen (library, RTLD_NOW);
869 if (handle == NULL)
870 {
02d868e8 871 if (libthread_db_debug)
17a37d48
PP
872 printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ());
873 return 0;
874 }
875
02d868e8 876 if (libthread_db_debug && strchr (library, '/') == NULL)
17a37d48
PP
877 {
878 void *td_init;
879
880 td_init = dlsym (handle, "td_init");
881 if (td_init != NULL)
882 {
883 const char *const libpath = dladdr_to_soname (td_init);
884
885 if (libpath != NULL)
886 printf_unfiltered (_("Host %s resolved to: %s.\n"),
887 library, libpath);
888 }
889 }
890
d90e17a7
PA
891 info = add_thread_db_info (handle);
892
bf88dd68
JK
893 /* Do not save system library name, that one is always trusted. */
894 if (strchr (library, '/') != NULL)
895 info->filename = gdb_realpath (library);
896
d90e17a7 897 if (try_thread_db_load_1 (info))
17a37d48
PP
898 return 1;
899
900 /* This library "refused" to work on current inferior. */
dfd4cc63 901 delete_thread_db_info (ptid_get_pid (inferior_ptid));
17a37d48
PP
902 return 0;
903}
904
290351b8 905/* Subroutine of try_thread_db_load_from_pdir to simplify it.
e6712ff1
DE
906 Try loading libthread_db in directory(OBJ)/SUBDIR.
907 SUBDIR may be NULL. It may also be something like "../lib64".
290351b8
DE
908 The result is true for success. */
909
910static int
e6712ff1 911try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir)
290351b8 912{
05386e9e
TT
913 struct cleanup *cleanup;
914 char *path, *cp;
915 int result;
4262abfb 916 const char *obj_name = objfile_name (obj);
290351b8 917
4262abfb 918 if (obj_name[0] != '/')
290351b8
DE
919 {
920 warning (_("Expected absolute pathname for libpthread in the"
4262abfb 921 " inferior, but got %s."), obj_name);
290351b8
DE
922 return 0;
923 }
05386e9e 924
4262abfb 925 path = xmalloc (strlen (obj_name) + (subdir ? strlen (subdir) + 1 : 0)
e6712ff1 926 + 1 + strlen (LIBTHREAD_DB_SO) + 1);
05386e9e
TT
927 cleanup = make_cleanup (xfree, path);
928
4262abfb 929 strcpy (path, obj_name);
05386e9e
TT
930 cp = strrchr (path, '/');
931 /* This should at minimum hit the first character. */
932 gdb_assert (cp != NULL);
e6712ff1
DE
933 cp[1] = '\0';
934 if (subdir != NULL)
935 {
936 strcat (cp, subdir);
937 strcat (cp, "/");
938 }
939 strcat (cp, LIBTHREAD_DB_SO);
bccbefd2 940
fde4f8ed 941 result = try_thread_db_load (path, 1);
05386e9e
TT
942
943 do_cleanups (cleanup);
944 return result;
290351b8
DE
945}
946
98a5dd13 947/* Handle $pdir in libthread-db-search-path.
e6712ff1
DE
948 Look for libthread_db in directory(libpthread)/SUBDIR.
949 SUBDIR may be NULL. It may also be something like "../lib64".
98a5dd13
DE
950 The result is true for success. */
951
952static int
e6712ff1 953try_thread_db_load_from_pdir (const char *subdir)
98a5dd13
DE
954{
955 struct objfile *obj;
956
bf88dd68
JK
957 if (!auto_load_thread_db)
958 return 0;
959
98a5dd13 960 ALL_OBJFILES (obj)
4262abfb 961 if (libpthread_name_p (objfile_name (obj)))
98a5dd13 962 {
e6712ff1 963 if (try_thread_db_load_from_pdir_1 (obj, subdir))
290351b8
DE
964 return 1;
965
966 /* We may have found the separate-debug-info version of
967 libpthread, and it may live in a directory without a matching
968 libthread_db. */
969 if (obj->separate_debug_objfile_backlink != NULL)
e6712ff1
DE
970 return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink,
971 subdir);
290351b8 972
98a5dd13
DE
973 return 0;
974 }
975
976 return 0;
977}
978
979/* Handle $sdir in libthread-db-search-path.
980 Look for libthread_db in the system dirs, or wherever a plain
981 dlopen(file_without_path) will look.
982 The result is true for success. */
983
984static int
985try_thread_db_load_from_sdir (void)
986{
fde4f8ed 987 return try_thread_db_load (LIBTHREAD_DB_SO, 0);
98a5dd13
DE
988}
989
990/* Try to load libthread_db from directory DIR of length DIR_LEN.
991 The result is true for success. */
992
993static int
994try_thread_db_load_from_dir (const char *dir, size_t dir_len)
995{
05386e9e
TT
996 struct cleanup *cleanup;
997 char *path;
998 int result;
98a5dd13 999
bf88dd68
JK
1000 if (!auto_load_thread_db)
1001 return 0;
1002
05386e9e
TT
1003 path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1);
1004 cleanup = make_cleanup (xfree, path);
98a5dd13
DE
1005
1006 memcpy (path, dir, dir_len);
1007 path[dir_len] = '/';
1008 strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
bccbefd2 1009
fde4f8ed 1010 result = try_thread_db_load (path, 1);
05386e9e
TT
1011
1012 do_cleanups (cleanup);
1013 return result;
98a5dd13
DE
1014}
1015
17a37d48 1016/* Search libthread_db_search_path for libthread_db which "agrees"
98a5dd13
DE
1017 to work on current inferior.
1018 The result is true for success. */
17a37d48
PP
1019
1020static int
1021thread_db_load_search (void)
1022{
e6712ff1
DE
1023 VEC (char_ptr) *dir_vec;
1024 struct cleanup *cleanups;
1025 char *this_dir;
1026 int i, rc = 0;
17a37d48 1027
e6712ff1
DE
1028 dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
1029 cleanups = make_cleanup_free_char_ptr_vec (dir_vec);
1030
1031 for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
17a37d48 1032 {
e6712ff1 1033 const int pdir_len = sizeof ("$pdir") - 1;
98a5dd13 1034 size_t this_dir_len;
e0881a8e 1035
e6712ff1 1036 this_dir_len = strlen (this_dir);
17a37d48 1037
e6712ff1
DE
1038 if (strncmp (this_dir, "$pdir", pdir_len) == 0
1039 && (this_dir[pdir_len] == '\0'
1040 || this_dir[pdir_len] == '/'))
98a5dd13 1041 {
e6712ff1 1042 char *subdir = NULL;
1fc3cf4a
TT
1043 struct cleanup *free_subdir_cleanup
1044 = make_cleanup (null_cleanup, NULL);
e6712ff1
DE
1045
1046 if (this_dir[pdir_len] == '/')
98a5dd13 1047 {
e6712ff1 1048 subdir = xmalloc (strlen (this_dir));
1fc3cf4a 1049 make_cleanup (xfree, subdir);
e6712ff1 1050 strcpy (subdir, this_dir + pdir_len + 1);
98a5dd13 1051 }
e6712ff1 1052 rc = try_thread_db_load_from_pdir (subdir);
1fc3cf4a 1053 do_cleanups (free_subdir_cleanup);
e6712ff1
DE
1054 if (rc)
1055 break;
17a37d48 1056 }
e6712ff1 1057 else if (strcmp (this_dir, "$sdir") == 0)
98a5dd13
DE
1058 {
1059 if (try_thread_db_load_from_sdir ())
1060 {
1061 rc = 1;
1062 break;
1063 }
1064 }
1065 else
17a37d48 1066 {
98a5dd13
DE
1067 if (try_thread_db_load_from_dir (this_dir, this_dir_len))
1068 {
1069 rc = 1;
1070 break;
1071 }
17a37d48
PP
1072 }
1073 }
98a5dd13 1074
e6712ff1 1075 do_cleanups (cleanups);
98a5dd13
DE
1076 if (libthread_db_debug)
1077 printf_unfiltered (_("thread_db_load_search returning %d\n"), rc);
17a37d48
PP
1078 return rc;
1079}
1080
98a5dd13
DE
1081/* Return non-zero if the inferior has a libpthread. */
1082
1083static int
1084has_libpthread (void)
1085{
1086 struct objfile *obj;
1087
1088 ALL_OBJFILES (obj)
4262abfb 1089 if (libpthread_name_p (objfile_name (obj)))
98a5dd13
DE
1090 return 1;
1091
1092 return 0;
1093}
1094
17a37d48 1095/* Attempt to load and initialize libthread_db.
1777feb0 1096 Return 1 on success. */
17a37d48
PP
1097
1098static int
1099thread_db_load (void)
1100{
d90e17a7 1101 struct thread_db_info *info;
17a37d48 1102
dfd4cc63 1103 info = get_thread_db_info (ptid_get_pid (inferior_ptid));
d90e17a7
PA
1104
1105 if (info != NULL)
17a37d48
PP
1106 return 1;
1107
856d6f99
PA
1108 /* Don't attempt to use thread_db on executables not running
1109 yet. */
1110 if (!target_has_registers)
17a37d48
PP
1111 return 0;
1112
1113 /* Don't attempt to use thread_db for remote targets. */
856d6f99 1114 if (!(target_can_run (&current_target) || core_bfd))
17a37d48
PP
1115 return 0;
1116
1117 if (thread_db_load_search ())
1118 return 1;
1119
98a5dd13
DE
1120 /* We couldn't find a libthread_db.
1121 If the inferior has a libpthread warn the user. */
1122 if (has_libpthread ())
1123 {
1124 warning (_("Unable to find libthread_db matching inferior's thread"
1125 " library, thread debugging will not be available."));
1126 return 0;
17a37d48 1127 }
98a5dd13 1128
17a37d48
PP
1129 /* Either this executable isn't using libpthread at all, or it is
1130 statically linked. Since we can't easily distinguish these two cases,
1131 no warning is issued. */
1132 return 0;
1133}
1134
fb0e1ba7 1135static void
12b6a110 1136disable_thread_event_reporting (struct thread_db_info *info)
fb0e1ba7 1137{
21e1bee4 1138 if (info->td_ta_clear_event_p != NULL)
12b6a110
PP
1139 {
1140 td_thr_events_t events;
fb0e1ba7 1141
12b6a110
PP
1142 /* Set the process wide mask saying we aren't interested in any
1143 events anymore. */
21e1bee4
PP
1144 td_event_fillset (&events);
1145 info->td_ta_clear_event_p (info->thread_agent, &events);
12b6a110 1146 }
fb0e1ba7 1147
d90e17a7
PA
1148 info->td_create_bp_addr = 0;
1149 info->td_death_bp_addr = 0;
fb0e1ba7
MK
1150}
1151
1152static void
1153check_thread_signals (void)
1154{
21bf60fe 1155 if (!thread_signals)
fb0e1ba7
MK
1156 {
1157 sigset_t mask;
1158 int i;
1159
669211f5 1160 lin_thread_get_thread_signals (&mask);
fb0e1ba7
MK
1161 sigemptyset (&thread_stop_set);
1162 sigemptyset (&thread_print_set);
1163
b9569773 1164 for (i = 1; i < NSIG; i++)
fb0e1ba7
MK
1165 {
1166 if (sigismember (&mask, i))
1167 {
2ea28649 1168 if (signal_stop_update (gdb_signal_from_host (i), 0))
fb0e1ba7 1169 sigaddset (&thread_stop_set, i);
2ea28649 1170 if (signal_print_update (gdb_signal_from_host (i), 0))
fb0e1ba7
MK
1171 sigaddset (&thread_print_set, i);
1172 thread_signals = 1;
1173 }
1174 }
1175 }
fb0e1ba7
MK
1176}
1177
0ec9a092
DJ
1178/* Check whether thread_db is usable. This function is called when
1179 an inferior is created (or otherwise acquired, e.g. attached to)
1180 and when new shared libraries are loaded into a running process. */
1181
1182void
1183check_for_thread_db (void)
fb0e1ba7 1184{
b5057acd 1185 /* Do nothing if we couldn't load libthread_db.so.1. */
17a37d48 1186 if (!thread_db_load ())
b5057acd 1187 return;
0ec9a092
DJ
1188}
1189
0838fb57
DE
1190/* This function is called via the new_objfile observer. */
1191
0ec9a092
DJ
1192static void
1193thread_db_new_objfile (struct objfile *objfile)
1194{
d90e17a7
PA
1195 /* This observer must always be called with inferior_ptid set
1196 correctly. */
1197
0838fb57 1198 if (objfile != NULL
fcb44371 1199 /* libpthread with separate debug info has its debug info file already
7d0e21ad 1200 loaded (and notified without successful thread_db initialization)
fcb44371
JK
1201 the time observer_notify_new_objfile is called for the library itself.
1202 Static executables have their separate debug info loaded already
1203 before the inferior has started. */
1204 && objfile->separate_debug_objfile_backlink == NULL
0838fb57
DE
1205 /* Only check for thread_db if we loaded libpthread,
1206 or if this is the main symbol file.
1207 We need to check OBJF_MAINLINE to handle the case of debugging
1208 a statically linked executable AND the symbol file is specified AFTER
1209 the exec file is loaded (e.g., gdb -c core ; file foo).
1210 For dynamically linked executables, libpthread can be near the end
1211 of the list of shared libraries to load, and in an app of several
1212 thousand shared libraries, this can otherwise be painful. */
1213 && ((objfile->flags & OBJF_MAINLINE) != 0
4262abfb 1214 || libpthread_name_p (objfile_name (objfile))))
0ec9a092 1215 check_for_thread_db ();
fb0e1ba7
MK
1216}
1217
0838fb57
DE
1218/* This function is called via the inferior_created observer.
1219 This handles the case of debugging statically linked executables. */
1220
1221static void
1222thread_db_inferior_created (struct target_ops *target, int from_tty)
1223{
1224 check_for_thread_db ();
1225}
1226
a2f23071
DJ
1227/* Attach to a new thread. This function is called when we receive a
1228 TD_CREATE event or when we iterate over all threads and find one
02c6c942 1229 that wasn't already in our list. Returns true on success. */
a2f23071 1230
02c6c942 1231static int
39f77062 1232attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
93815fbf 1233 const td_thrinfo_t *ti_p)
fb0e1ba7 1234{
17faa917 1235 struct private_thread_info *private;
2a2ef594 1236 struct thread_info *tp;
fb0e1ba7 1237 td_err_e err;
d90e17a7 1238 struct thread_db_info *info;
fb0e1ba7 1239
a2f23071
DJ
1240 /* If we're being called after a TD_CREATE event, we may already
1241 know about this thread. There are two ways this can happen. We
1242 may have iterated over all threads between the thread creation
1243 and the TD_CREATE event, for instance when the user has issued
1244 the `info threads' command before the SIGTRAP for hitting the
1245 thread creation breakpoint was reported. Alternatively, the
1246 thread may have exited and a new one been created with the same
1247 thread ID. In the first case we don't need to do anything; in
1248 the second case we should discard information about the dead
1249 thread and attach to the new one. */
2a2ef594
PA
1250 tp = find_thread_ptid (ptid);
1251 if (tp != NULL)
a2f23071 1252 {
17faa917
DJ
1253 /* If tp->private is NULL, then GDB is already attached to this
1254 thread, but we do not know anything about it. We can learn
1255 about it here. This can only happen if we have some other
1256 way besides libthread_db to notice new threads (i.e.
1257 PTRACE_EVENT_CLONE); assume the same mechanism notices thread
1258 exit, so this can not be a stale thread recreated with the
1259 same ID. */
1260 if (tp->private != NULL)
1261 {
1262 if (!tp->private->dying)
02c6c942 1263 return 0;
a2f23071 1264
17faa917
DJ
1265 delete_thread (ptid);
1266 tp = NULL;
1267 }
a2f23071
DJ
1268 }
1269
856d6f99
PA
1270 if (target_has_execution)
1271 check_thread_signals ();
fb0e1ba7 1272
9ee57c33 1273 /* Under GNU/Linux, we have to attach to each and every thread. */
856d6f99 1274 if (target_has_execution
84636d28
PA
1275 && tp == NULL)
1276 {
1277 int res;
1278
dfd4cc63
LM
1279 res = lin_lwp_attach_lwp (ptid_build (ptid_get_pid (ptid),
1280 ti_p->ti_lid, 0));
84636d28
PA
1281 if (res < 0)
1282 {
1283 /* Error, stop iterating. */
1284 return 0;
1285 }
1286 else if (res > 0)
1287 {
1288 /* Pretend this thread doesn't exist yet, and keep
1289 iterating. */
1290 return 1;
1291 }
1292
1293 /* Otherwise, we sucessfully attached to the thread. */
1294 }
9ee57c33 1295
17faa917
DJ
1296 /* Construct the thread's private data. */
1297 private = xmalloc (sizeof (struct private_thread_info));
1298 memset (private, 0, sizeof (struct private_thread_info));
1299
1300 /* A thread ID of zero may mean the thread library has not initialized
1301 yet. But we shouldn't even get here if that's the case. FIXME:
1302 if we change GDB to always have at least one thread in the thread
1303 list this will have to go somewhere else; maybe private == NULL
1304 until the thread_db target claims it. */
1305 gdb_assert (ti_p->ti_tid != 0);
1306 private->th = *th_p;
1307 private->tid = ti_p->ti_tid;
64776a0b
PA
1308 if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
1309 private->dying = 1;
17faa917 1310
fb0e1ba7 1311 /* Add the thread to GDB's thread list. */
17faa917 1312 if (tp == NULL)
2e456570 1313 add_thread_with_info (ptid, private);
17faa917
DJ
1314 else
1315 tp->private = private;
5365276c 1316
dfd4cc63 1317 info = get_thread_db_info (ptid_get_pid (ptid));
d90e17a7 1318
856d6f99
PA
1319 /* Enable thread event reporting for this thread, except when
1320 debugging a core file. */
1321 if (target_has_execution)
1322 {
1323 err = info->td_thr_event_enable_p (th_p, 1);
1324 if (err != TD_OK)
1325 error (_("Cannot enable thread event reporting for %s: %s"),
1326 target_pid_to_str (ptid), thread_db_err_str (err));
1327 }
1328
02c6c942 1329 return 1;
fb0e1ba7
MK
1330}
1331
1332static void
17faa917 1333detach_thread (ptid_t ptid)
fb0e1ba7 1334{
a2f23071
DJ
1335 struct thread_info *thread_info;
1336
a2f23071
DJ
1337 /* Don't delete the thread now, because it still reports as active
1338 until it has executed a few instructions after the event
1339 breakpoint - if we deleted it now, "info threads" would cause us
1340 to re-attach to it. Just mark it as having had a TD_DEATH
1341 event. This means that we won't delete it from our thread list
1342 until we notice that it's dead (via prune_threads), or until
17faa917
DJ
1343 something re-uses its thread ID. We'll report the thread exit
1344 when the underlying LWP dies. */
e09875d4 1345 thread_info = find_thread_ptid (ptid);
17faa917 1346 gdb_assert (thread_info != NULL && thread_info->private != NULL);
a2f23071 1347 thread_info->private->dying = 1;
fb0e1ba7
MK
1348}
1349
1350static void
52554a0e 1351thread_db_detach (struct target_ops *ops, const char *args, int from_tty)
fb0e1ba7 1352{
117de6a9 1353 struct target_ops *target_beneath = find_target_beneath (ops);
d90e17a7 1354 struct thread_db_info *info;
117de6a9 1355
dfd4cc63 1356 info = get_thread_db_info (ptid_get_pid (inferior_ptid));
c194fbe1 1357
d90e17a7
PA
1358 if (info)
1359 {
856d6f99
PA
1360 if (target_has_execution)
1361 {
1362 disable_thread_event_reporting (info);
1363
1364 /* Delete the old thread event breakpoints. Note that
1365 unlike when mourning, we can remove them here because
1366 there's still a live inferior to poke at. In any case,
1367 GDB will not try to insert anything in the inferior when
1368 removing a breakpoint. */
1369 remove_thread_event_breakpoints ();
1370 }
d90e17a7 1371
dfd4cc63 1372 delete_thread_db_info (ptid_get_pid (inferior_ptid));
d90e17a7 1373 }
4105de34 1374
7a7d3353 1375 target_beneath->to_detach (target_beneath, args, from_tty);
d90e17a7
PA
1376
1377 /* NOTE: From this point on, inferior_ptid is null_ptid. */
1378
1379 /* If there are no more processes using libpthread, detach the
1380 thread_db target ops. */
1381 if (!thread_db_list)
1382 unpush_target (&thread_db_ops);
fb0e1ba7
MK
1383}
1384
fb0e1ba7
MK
1385/* Check if PID is currently stopped at the location of a thread event
1386 breakpoint location. If it is, read the event message and act upon
1387 the event. */
1388
1389static void
39f77062 1390check_event (ptid_t ptid)
fb0e1ba7 1391{
515630c5
UW
1392 struct regcache *regcache = get_thread_regcache (ptid);
1393 struct gdbarch *gdbarch = get_regcache_arch (regcache);
fb0e1ba7
MK
1394 td_event_msg_t msg;
1395 td_thrinfo_t ti;
1396 td_err_e err;
1397 CORE_ADDR stop_pc;
4d9850d3 1398 int loop = 0;
d90e17a7
PA
1399 struct thread_db_info *info;
1400
dfd4cc63 1401 info = get_thread_db_info (ptid_get_pid (ptid));
fb0e1ba7
MK
1402
1403 /* Bail out early if we're not at a thread event breakpoint. */
515630c5 1404 stop_pc = regcache_read_pc (regcache)
118e6252 1405 - target_decr_pc_after_break (gdbarch);
d90e17a7
PA
1406 if (stop_pc != info->td_create_bp_addr
1407 && stop_pc != info->td_death_bp_addr)
fb0e1ba7
MK
1408 return;
1409
4c28f408 1410 /* Access an lwp we know is stopped. */
d90e17a7 1411 info->proc_handle.ptid = ptid;
4c28f408
PA
1412
1413 /* If we have only looked at the first thread before libpthread was
1414 initialized, we may not know its thread ID yet. Make sure we do
1415 before we add another thread to the list. */
d90e17a7
PA
1416 if (!have_threads (ptid))
1417 thread_db_find_new_threads_1 (ptid);
4c28f408 1418
4d9850d3
JJ
1419 /* If we are at a create breakpoint, we do not know what new lwp
1420 was created and cannot specifically locate the event message for it.
1421 We have to call td_ta_event_getmsg() to get
1422 the latest message. Since we have no way of correlating whether
cdbc0b18 1423 the event message we get back corresponds to our breakpoint, we must
4d9850d3 1424 loop and read all event messages, processing them appropriately.
cdbc0b18
RM
1425 This guarantees we will process the correct message before continuing
1426 from the breakpoint.
4d9850d3
JJ
1427
1428 Currently, death events are not enabled. If they are enabled,
1429 the death event can use the td_thr_event_getmsg() interface to
1430 get the message specifically for that lwp and avoid looping
1431 below. */
1432
1433 loop = 1;
1434
1435 do
fb0e1ba7 1436 {
d90e17a7 1437 err = info->td_ta_event_getmsg_p (info->thread_agent, &msg);
4d9850d3
JJ
1438 if (err != TD_OK)
1439 {
1440 if (err == TD_NOMSG)
1441 return;
fb0e1ba7 1442
8a3fe4f8 1443 error (_("Cannot get thread event message: %s"),
4d9850d3
JJ
1444 thread_db_err_str (err));
1445 }
fb0e1ba7 1446
d90e17a7 1447 err = info->td_thr_get_info_p (msg.th_p, &ti);
4d9850d3 1448 if (err != TD_OK)
8a3fe4f8 1449 error (_("Cannot get thread info: %s"), thread_db_err_str (err));
fb0e1ba7 1450
dfd4cc63 1451 ptid = ptid_build (ptid_get_pid (ptid), ti.ti_lid, 0);
fb0e1ba7 1452
4d9850d3
JJ
1453 switch (msg.event)
1454 {
1455 case TD_CREATE:
a2f23071
DJ
1456 /* Call attach_thread whether or not we already know about a
1457 thread with this thread ID. */
93815fbf 1458 attach_thread (ptid, msg.th_p, &ti);
fb0e1ba7 1459
4d9850d3 1460 break;
fb0e1ba7 1461
4d9850d3 1462 case TD_DEATH:
fb0e1ba7 1463
4d9850d3 1464 if (!in_thread_list (ptid))
8a3fe4f8 1465 error (_("Spurious thread death event."));
fb0e1ba7 1466
17faa917 1467 detach_thread (ptid);
fb0e1ba7 1468
4d9850d3 1469 break;
fb0e1ba7 1470
4d9850d3 1471 default:
8a3fe4f8 1472 error (_("Spurious thread event."));
4d9850d3 1473 }
fb0e1ba7 1474 }
4d9850d3 1475 while (loop);
fb0e1ba7
MK
1476}
1477
39f77062 1478static ptid_t
117de6a9 1479thread_db_wait (struct target_ops *ops,
47608cb1
PA
1480 ptid_t ptid, struct target_waitstatus *ourstatus,
1481 int options)
fb0e1ba7 1482{
d90e17a7 1483 struct thread_db_info *info;
117de6a9
PA
1484 struct target_ops *beneath = find_target_beneath (ops);
1485
47608cb1 1486 ptid = beneath->to_wait (beneath, ptid, ourstatus, options);
fb0e1ba7 1487
b84876c2
PA
1488 if (ourstatus->kind == TARGET_WAITKIND_IGNORE)
1489 return ptid;
1490
1111f4aa 1491 if (ourstatus->kind == TARGET_WAITKIND_EXITED
fb66883a
PA
1492 || ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
1493 return ptid;
fb0e1ba7 1494
dfd4cc63 1495 info = get_thread_db_info (ptid_get_pid (ptid));
d90e17a7
PA
1496
1497 /* If this process isn't using thread_db, we're done. */
1498 if (info == NULL)
1499 return ptid;
1500
3f64f7b1
DJ
1501 if (ourstatus->kind == TARGET_WAITKIND_EXECD)
1502 {
d90e17a7
PA
1503 /* New image, it may or may not end up using thread_db. Assume
1504 not unless we find otherwise. */
dfd4cc63 1505 delete_thread_db_info (ptid_get_pid (ptid));
d90e17a7
PA
1506 if (!thread_db_list)
1507 unpush_target (&thread_db_ops);
3f64f7b1 1508
6c95b8df
PA
1509 /* Thread event breakpoints are deleted by
1510 update_breakpoints_after_exec. */
1511
49fd4a42 1512 return ptid;
3f64f7b1
DJ
1513 }
1514
4105de34
DJ
1515 /* If we do not know about the main thread yet, this would be a good time to
1516 find it. */
d90e17a7
PA
1517 if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid))
1518 thread_db_find_new_threads_1 (ptid);
4105de34 1519
fb0e1ba7 1520 if (ourstatus->kind == TARGET_WAITKIND_STOPPED
a493e3e2 1521 && ourstatus->value.sig == GDB_SIGNAL_TRAP)
fb0e1ba7 1522 /* Check for a thread event. */
39f77062 1523 check_event (ptid);
fb0e1ba7 1524
d90e17a7 1525 if (have_threads (ptid))
4105de34 1526 {
64776a0b
PA
1527 /* Fill in the thread's user-level thread id. */
1528 thread_from_lwp (ptid);
4105de34 1529 }
fb0e1ba7 1530
b9b5d7ea 1531 return ptid;
fb0e1ba7
MK
1532}
1533
fb0e1ba7 1534static void
136d6dae 1535thread_db_mourn_inferior (struct target_ops *ops)
fb0e1ba7 1536{
117de6a9
PA
1537 struct target_ops *target_beneath = find_target_beneath (ops);
1538
dfd4cc63 1539 delete_thread_db_info (ptid_get_pid (inferior_ptid));
fb0e1ba7 1540
d90e17a7
PA
1541 target_beneath->to_mourn_inferior (target_beneath);
1542
6c95b8df
PA
1543 /* Delete the old thread event breakpoints. Do this after mourning
1544 the inferior, so that we don't try to uninsert them. */
1545 remove_thread_event_breakpoints ();
1546
b26a6851 1547 /* Detach thread_db target ops. */
d90e17a7
PA
1548 if (!thread_db_list)
1549 unpush_target (ops);
fb0e1ba7
MK
1550}
1551
02c6c942
PP
1552struct callback_data
1553{
1554 struct thread_db_info *info;
1555 int new_threads;
1556};
1557
fb0e1ba7
MK
1558static int
1559find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
1560{
1561 td_thrinfo_t ti;
1562 td_err_e err;
39f77062 1563 ptid_t ptid;
403fe197 1564 struct thread_info *tp;
02c6c942
PP
1565 struct callback_data *cb_data = data;
1566 struct thread_db_info *info = cb_data->info;
fb0e1ba7 1567
d90e17a7 1568 err = info->td_thr_get_info_p (th_p, &ti);
fb0e1ba7 1569 if (err != TD_OK)
8a3fe4f8 1570 error (_("find_new_threads_callback: cannot get thread info: %s"),
3197744f 1571 thread_db_err_str (err));
fb0e1ba7 1572
254f582e 1573 if (ti.ti_tid == 0)
4105de34
DJ
1574 {
1575 /* A thread ID of zero means that this is the main thread, but
1576 glibc has not yet initialized thread-local storage and the
1577 pthread library. We do not know what the thread's TID will
1578 be yet. Just enable event reporting and otherwise ignore
1579 it. */
1580
4d062f1a
PA
1581 /* In that case, we're not stopped in a fork syscall and don't
1582 need this glibc bug workaround. */
1583 info->need_stale_parent_threads_check = 0;
1584
254f582e
JK
1585 if (target_has_execution)
1586 {
1587 err = info->td_thr_event_enable_p (th_p, 1);
1588 if (err != TD_OK)
1589 error (_("Cannot enable thread event reporting for LWP %d: %s"),
1590 (int) ti.ti_lid, thread_db_err_str (err));
1591 }
4105de34
DJ
1592
1593 return 0;
1594 }
1595
4d062f1a
PA
1596 /* Ignore stale parent threads, caused by glibc/BZ5983. This is a
1597 bit expensive, as it needs to open /proc/pid/status, so try to
1598 avoid doing the work if we know we don't have to. */
1599 if (info->need_stale_parent_threads_check)
1600 {
1601 int tgid = linux_proc_get_tgid (ti.ti_lid);
e0881a8e 1602
4d062f1a
PA
1603 if (tgid != -1 && tgid != info->pid)
1604 return 0;
1605 }
1606
1607 ptid = ptid_build (info->pid, ti.ti_lid, 0);
e09875d4 1608 tp = find_thread_ptid (ptid);
403fe197 1609 if (tp == NULL || tp->private == NULL)
02c6c942
PP
1610 {
1611 if (attach_thread (ptid, th_p, &ti))
1612 cb_data->new_threads += 1;
1613 else
1614 /* Problem attaching this thread; perhaps it exited before we
1615 could attach it?
1616 This could mean that the thread list inside glibc itself is in
1617 inconsistent state, and libthread_db could go on looping forever
1618 (observed with glibc-2.3.6). To prevent that, terminate
1619 iteration: thread_db_find_new_threads_2 will retry. */
1620 return 1;
1621 }
fb0e1ba7
MK
1622
1623 return 0;
1624}
1625
02c6c942
PP
1626/* Helper for thread_db_find_new_threads_2.
1627 Returns number of new threads found. */
1628
1629static int
1630find_new_threads_once (struct thread_db_info *info, int iteration,
fb169834 1631 td_err_e *errp)
02c6c942
PP
1632{
1633 volatile struct gdb_exception except;
1634 struct callback_data data;
fb169834 1635 td_err_e err = TD_ERR;
02c6c942
PP
1636
1637 data.info = info;
1638 data.new_threads = 0;
1639
1640 TRY_CATCH (except, RETURN_MASK_ERROR)
1641 {
1642 /* Iterate over all user-space threads to discover new threads. */
1643 err = info->td_ta_thr_iter_p (info->thread_agent,
1644 find_new_threads_callback,
1645 &data,
1646 TD_THR_ANY_STATE,
1647 TD_THR_LOWEST_PRIORITY,
1648 TD_SIGNO_MASK,
1649 TD_THR_ANY_USER_FLAGS);
1650 }
1651
02d868e8 1652 if (libthread_db_debug)
02c6c942
PP
1653 {
1654 if (except.reason < 0)
1655 exception_fprintf (gdb_stderr, except,
1656 "Warning: find_new_threads_once: ");
1657
1658 printf_filtered (_("Found %d new threads in iteration %d.\n"),
1659 data.new_threads, iteration);
1660 }
1661
1662 if (errp != NULL)
1663 *errp = err;
1664
1665 return data.new_threads;
1666}
1667
4c28f408 1668/* Search for new threads, accessing memory through stopped thread
02c6c942
PP
1669 PTID. If UNTIL_NO_NEW is true, repeat searching until several
1670 searches in a row do not discover any new threads. */
4c28f408 1671
fb0e1ba7 1672static void
02c6c942 1673thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new)
fb0e1ba7 1674{
fcb44371 1675 td_err_e err = TD_OK;
d90e17a7 1676 struct thread_db_info *info;
02c6c942 1677 int i, loop;
4c28f408 1678
dfd4cc63 1679 info = get_thread_db_info (ptid_get_pid (ptid));
d90e17a7 1680
4c28f408 1681 /* Access an lwp we know is stopped. */
d90e17a7 1682 info->proc_handle.ptid = ptid;
02c6c942
PP
1683
1684 if (until_no_new)
1685 {
1686 /* Require 4 successive iterations which do not find any new threads.
1687 The 4 is a heuristic: there is an inherent race here, and I have
1688 seen that 2 iterations in a row are not always sufficient to
1689 "capture" all threads. */
fcb44371
JK
1690 for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop)
1691 if (find_new_threads_once (info, i, &err) != 0)
1692 {
1693 /* Found some new threads. Restart the loop from beginning. */
1694 loop = -1;
1695 }
02c6c942
PP
1696 }
1697 else
fcb44371
JK
1698 find_new_threads_once (info, 0, &err);
1699
1700 if (err != TD_OK)
1701 error (_("Cannot find new threads: %s"), thread_db_err_str (err));
fb0e1ba7
MK
1702}
1703
02c6c942
PP
1704static void
1705thread_db_find_new_threads_1 (ptid_t ptid)
1706{
1707 thread_db_find_new_threads_2 (ptid, 0);
1708}
1709
dc146f7c
VP
1710static int
1711update_thread_core (struct lwp_info *info, void *closure)
1712{
2e794194 1713 info->core = linux_common_core_of_thread (info->ptid);
dc146f7c
VP
1714 return 0;
1715}
02c6c942 1716
28439f5e
PA
1717static void
1718thread_db_find_new_threads (struct target_ops *ops)
1719{
d90e17a7 1720 struct thread_db_info *info;
c65b3e0d 1721 struct inferior *inf;
d90e17a7 1722
c65b3e0d
PA
1723 ALL_INFERIORS (inf)
1724 {
1725 struct thread_info *thread;
d90e17a7 1726
c65b3e0d
PA
1727 if (inf->pid == 0)
1728 continue;
d90e17a7 1729
c65b3e0d
PA
1730 info = get_thread_db_info (inf->pid);
1731 if (info == NULL)
1732 continue;
1733
1734 thread = any_live_thread_of_process (inf->pid);
1735 if (thread == NULL || thread->executing)
1736 continue;
1737
1738 thread_db_find_new_threads_1 (thread->ptid);
1739 }
dc146f7c 1740
856d6f99
PA
1741 if (target_has_execution)
1742 iterate_over_lwps (minus_one_ptid /* iterate over all */,
1743 update_thread_core, NULL);
28439f5e
PA
1744}
1745
fb0e1ba7 1746static char *
117de6a9 1747thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid)
fb0e1ba7 1748{
e09875d4 1749 struct thread_info *thread_info = find_thread_ptid (ptid);
117de6a9 1750 struct target_ops *beneath;
17faa917
DJ
1751
1752 if (thread_info != NULL && thread_info->private != NULL)
fb0e1ba7
MK
1753 {
1754 static char buf[64];
17faa917 1755 thread_t tid;
fb0e1ba7 1756
17faa917 1757 tid = thread_info->private->tid;
17faa917 1758 snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)",
dfd4cc63 1759 tid, ptid_get_lwp (ptid));
fb0e1ba7
MK
1760
1761 return buf;
1762 }
1763
117de6a9
PA
1764 beneath = find_target_beneath (ops);
1765 if (beneath->to_pid_to_str (beneath, ptid))
1766 return beneath->to_pid_to_str (beneath, ptid);
fb0e1ba7 1767
39f77062 1768 return normal_pid_to_str (ptid);
fb0e1ba7
MK
1769}
1770
28b17333
DJ
1771/* Return a string describing the state of the thread specified by
1772 INFO. */
1773
1774static char *
1775thread_db_extra_thread_info (struct thread_info *info)
1776{
17faa917
DJ
1777 if (info->private == NULL)
1778 return NULL;
1779
28b17333
DJ
1780 if (info->private->dying)
1781 return "Exiting";
1782
1783 return NULL;
1784}
1785
b2756930
KB
1786/* Get the address of the thread local variable in load module LM which
1787 is stored at OFFSET within the thread local storage for thread PTID. */
3f47be5c
EZ
1788
1789static CORE_ADDR
117de6a9
PA
1790thread_db_get_thread_local_address (struct target_ops *ops,
1791 ptid_t ptid,
b2756930 1792 CORE_ADDR lm,
b4acd559 1793 CORE_ADDR offset)
3f47be5c 1794{
17faa917 1795 struct thread_info *thread_info;
117de6a9 1796 struct target_ops *beneath;
17faa917 1797
4105de34 1798 /* If we have not discovered any threads yet, check now. */
d90e17a7
PA
1799 if (!have_threads (ptid))
1800 thread_db_find_new_threads_1 (ptid);
4105de34 1801
17faa917 1802 /* Find the matching thread. */
e09875d4 1803 thread_info = find_thread_ptid (ptid);
4105de34 1804
17faa917 1805 if (thread_info != NULL && thread_info->private != NULL)
3f47be5c 1806 {
3f47be5c 1807 td_err_e err;
00f515da 1808 psaddr_t address;
d90e17a7
PA
1809 struct thread_db_info *info;
1810
dfd4cc63 1811 info = get_thread_db_info (ptid_get_pid (ptid));
3f47be5c
EZ
1812
1813 /* glibc doesn't provide the needed interface. */
d90e17a7 1814 if (!info->td_thr_tls_get_addr_p)
109c3e39
AC
1815 throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
1816 _("No TLS library support"));
3f47be5c 1817
b2756930
KB
1818 /* Caller should have verified that lm != 0. */
1819 gdb_assert (lm != 0);
3f47be5c 1820
3f47be5c 1821 /* Finally, get the address of the variable. */
00f515da
DE
1822 /* Note the cast through uintptr_t: this interface only works if
1823 a target address fits in a psaddr_t, which is a host pointer.
1824 So a 32-bit debugger can not access 64-bit TLS through this. */
d90e17a7 1825 err = info->td_thr_tls_get_addr_p (&thread_info->private->th,
00f515da 1826 (psaddr_t)(uintptr_t) lm,
d90e17a7 1827 offset, &address);
3f47be5c
EZ
1828
1829#ifdef THREAD_DB_HAS_TD_NOTALLOC
1830 /* The memory hasn't been allocated, yet. */
1831 if (err == TD_NOTALLOC)
b4acd559
JJ
1832 /* Now, if libthread_db provided the initialization image's
1833 address, we *could* try to build a non-lvalue value from
1834 the initialization image. */
109c3e39
AC
1835 throw_error (TLS_NOT_ALLOCATED_YET_ERROR,
1836 _("TLS not allocated yet"));
3f47be5c
EZ
1837#endif
1838
1839 /* Something else went wrong. */
1840 if (err != TD_OK)
109c3e39
AC
1841 throw_error (TLS_GENERIC_ERROR,
1842 (("%s")), thread_db_err_str (err));
3f47be5c
EZ
1843
1844 /* Cast assuming host == target. Joy. */
16451949
AS
1845 /* Do proper sign extension for the target. */
1846 gdb_assert (exec_bfd);
1847 return (bfd_get_sign_extend_vma (exec_bfd) > 0
1848 ? (CORE_ADDR) (intptr_t) address
1849 : (CORE_ADDR) (uintptr_t) address);
3f47be5c
EZ
1850 }
1851
117de6a9
PA
1852 beneath = find_target_beneath (ops);
1853 if (beneath->to_get_thread_local_address)
1854 return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
93ad78a7 1855 else
109c3e39
AC
1856 throw_error (TLS_GENERIC_ERROR,
1857 _("TLS not supported on this target"));
3f47be5c
EZ
1858}
1859
0ef643c8
JB
1860/* Callback routine used to find a thread based on the TID part of
1861 its PTID. */
1862
1863static int
1864thread_db_find_thread_from_tid (struct thread_info *thread, void *data)
1865{
1866 long *tid = (long *) data;
1867
1868 if (thread->private->tid == *tid)
1869 return 1;
1870
1871 return 0;
1872}
1873
1874/* Implement the to_get_ada_task_ptid target method for this target. */
1875
1876static ptid_t
1877thread_db_get_ada_task_ptid (long lwp, long thread)
1878{
1879 struct thread_info *thread_info;
1880
d90e17a7 1881 thread_db_find_new_threads_1 (inferior_ptid);
0ef643c8
JB
1882 thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread);
1883
1884 gdb_assert (thread_info != NULL);
1885
1886 return (thread_info->ptid);
1887}
1888
4d062f1a
PA
1889static void
1890thread_db_resume (struct target_ops *ops,
2ea28649 1891 ptid_t ptid, int step, enum gdb_signal signo)
4d062f1a
PA
1892{
1893 struct target_ops *beneath = find_target_beneath (ops);
1894 struct thread_db_info *info;
1895
1896 if (ptid_equal (ptid, minus_one_ptid))
dfd4cc63 1897 info = get_thread_db_info (ptid_get_pid (inferior_ptid));
4d062f1a 1898 else
dfd4cc63 1899 info = get_thread_db_info (ptid_get_pid (ptid));
4d062f1a
PA
1900
1901 /* This workaround is only needed for child fork lwps stopped in a
1902 PTRACE_O_TRACEFORK event. When the inferior is resumed, the
1903 workaround can be disabled. */
1904 if (info)
1905 info->need_stale_parent_threads_check = 0;
1906
1907 beneath->to_resume (beneath, ptid, step, signo);
1908}
1909
bf88dd68
JK
1910/* qsort helper function for info_auto_load_libthread_db, sort the
1911 thread_db_info pointers primarily by their FILENAME and secondarily by their
1912 PID, both in ascending order. */
1913
1914static int
1915info_auto_load_libthread_db_compare (const void *ap, const void *bp)
1916{
1917 struct thread_db_info *a = *(struct thread_db_info **) ap;
1918 struct thread_db_info *b = *(struct thread_db_info **) bp;
1919 int retval;
1920
1921 retval = strcmp (a->filename, b->filename);
1922 if (retval)
1923 return retval;
1924
1925 return (a->pid > b->pid) - (a->pid - b->pid);
1926}
1927
1928/* Implement 'info auto-load libthread-db'. */
1929
1930static void
1931info_auto_load_libthread_db (char *args, int from_tty)
1932{
1933 struct ui_out *uiout = current_uiout;
1934 const char *cs = args ? args : "";
1935 struct thread_db_info *info, **array;
1936 unsigned info_count, unique_filenames;
1937 size_t max_filename_len, max_pids_len, pids_len;
1938 struct cleanup *back_to;
1939 char *pids;
1940 int i;
1941
529480d0 1942 cs = skip_spaces_const (cs);
bf88dd68
JK
1943 if (*cs)
1944 error (_("'info auto-load libthread-db' does not accept any parameters"));
1945
1946 info_count = 0;
1947 for (info = thread_db_list; info; info = info->next)
1948 if (info->filename != NULL)
1949 info_count++;
1950
1951 array = xmalloc (sizeof (*array) * info_count);
1952 back_to = make_cleanup (xfree, array);
1953
1954 info_count = 0;
1955 for (info = thread_db_list; info; info = info->next)
1956 if (info->filename != NULL)
1957 array[info_count++] = info;
1958
1959 /* Sort ARRAY by filenames and PIDs. */
1960
1961 qsort (array, info_count, sizeof (*array),
1962 info_auto_load_libthread_db_compare);
1963
1964 /* Calculate the number of unique filenames (rows) and the maximum string
1965 length of PIDs list for the unique filenames (columns). */
1966
1967 unique_filenames = 0;
1968 max_filename_len = 0;
1969 max_pids_len = 0;
1970 pids_len = 0;
1971 for (i = 0; i < info_count; i++)
1972 {
1973 int pid = array[i]->pid;
1974 size_t this_pid_len;
1975
1976 for (this_pid_len = 0; pid != 0; pid /= 10)
1977 this_pid_len++;
1978
1979 if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0)
1980 {
1981 unique_filenames++;
1982 max_filename_len = max (max_filename_len,
1983 strlen (array[i]->filename));
1984
1985 if (i > 0)
1986 {
1987 pids_len -= strlen (", ");
1988 max_pids_len = max (max_pids_len, pids_len);
1989 }
1990 pids_len = 0;
1991 }
1992 pids_len += this_pid_len + strlen (", ");
1993 }
1994 if (i)
1995 {
1996 pids_len -= strlen (", ");
1997 max_pids_len = max (max_pids_len, pids_len);
1998 }
1999
2000 /* Table header shifted right by preceding "libthread-db: " would not match
2001 its columns. */
2002 if (info_count > 0 && args == auto_load_info_scripts_pattern_nl)
2003 ui_out_text (uiout, "\n");
2004
2005 make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames,
2006 "LinuxThreadDbTable");
2007
2008 ui_out_table_header (uiout, max_filename_len, ui_left, "filename",
2009 "Filename");
2010 ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids");
2011 ui_out_table_body (uiout);
2012
2013 pids = xmalloc (max_pids_len + 1);
2014 make_cleanup (xfree, pids);
2015
2016 /* Note I is incremented inside the cycle, not at its end. */
2017 for (i = 0; i < info_count;)
2018 {
2019 struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
2020 char *pids_end;
2021
2022 info = array[i];
2023 ui_out_field_string (uiout, "filename", info->filename);
2024 pids_end = pids;
2025
2026 while (i < info_count && strcmp (info->filename, array[i]->filename) == 0)
2027 {
2028 if (pids_end != pids)
2029 {
2030 *pids_end++ = ',';
2031 *pids_end++ = ' ';
2032 }
2033 pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end,
2034 "%u", array[i]->pid);
2035 gdb_assert (pids_end < &pids[max_pids_len + 1]);
2036
2037 i++;
2038 }
2039 *pids_end = '\0';
2040
2041 ui_out_field_string (uiout, "pids", pids);
2042
2043 ui_out_text (uiout, "\n");
2044 do_cleanups (chain);
2045 }
2046
2047 do_cleanups (back_to);
2048
2049 if (info_count == 0)
2050 ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n"));
2051}
2052
fb0e1ba7
MK
2053static void
2054init_thread_db_ops (void)
2055{
2056 thread_db_ops.to_shortname = "multi-thread";
2057 thread_db_ops.to_longname = "multi-threaded child process.";
2058 thread_db_ops.to_doc = "Threads and pthreads support.";
2059 thread_db_ops.to_detach = thread_db_detach;
fb0e1ba7 2060 thread_db_ops.to_wait = thread_db_wait;
4d062f1a 2061 thread_db_ops.to_resume = thread_db_resume;
fb0e1ba7 2062 thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
fb0e1ba7
MK
2063 thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
2064 thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
2065 thread_db_ops.to_stratum = thread_stratum;
2066 thread_db_ops.to_has_thread_control = tc_schedlock;
3f47be5c
EZ
2067 thread_db_ops.to_get_thread_local_address
2068 = thread_db_get_thread_local_address;
28b17333 2069 thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info;
0ef643c8 2070 thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid;
fb0e1ba7 2071 thread_db_ops.to_magic = OPS_MAGIC;
c22a2b88
TT
2072
2073 complete_target_initialization (&thread_db_ops);
fb0e1ba7
MK
2074}
2075
2c0b251b
PA
2076/* Provide a prototype to silence -Wmissing-prototypes. */
2077extern initialize_file_ftype _initialize_thread_db;
2078
fb0e1ba7
MK
2079void
2080_initialize_thread_db (void)
2081{
17a37d48 2082 init_thread_db_ops ();
17a37d48
PP
2083
2084 /* Defer loading of libthread_db.so until inferior is running.
2085 This allows gdb to load correct libthread_db for a given
2086 executable -- there could be mutiple versions of glibc,
2087 compiled with LinuxThreads or NPTL, and until there is
2088 a running inferior, we can't tell which libthread_db is
1777feb0 2089 the correct one to load. */
17a37d48
PP
2090
2091 libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
2092
2093 add_setshow_optional_filename_cmd ("libthread-db-search-path",
2094 class_support,
2095 &libthread_db_search_path, _("\
2096Set search path for libthread_db."), _("\
2097Show the current search path or libthread_db."), _("\
2098This path is used to search for libthread_db to be loaded into \
84e578fb
DE
2099gdb itself.\n\
2100Its value is a colon (':') separate list of directories to search.\n\
2101Setting the search path to an empty list resets it to its default value."),
2102 set_libthread_db_search_path,
17a37d48
PP
2103 NULL,
2104 &setlist, &showlist);
02d868e8 2105
ccce17b0
YQ
2106 add_setshow_zuinteger_cmd ("libthread-db", class_maintenance,
2107 &libthread_db_debug, _("\
02d868e8
PP
2108Set libthread-db debugging."), _("\
2109Show libthread-db debugging."), _("\
2110When non-zero, libthread-db debugging is enabled."),
ccce17b0
YQ
2111 NULL,
2112 show_libthread_db_debug,
2113 &setdebuglist, &showdebuglist);
02d868e8 2114
bf88dd68
JK
2115 add_setshow_boolean_cmd ("libthread-db", class_support,
2116 &auto_load_thread_db, _("\
2117Enable or disable auto-loading of inferior specific libthread_db."), _("\
2118Show whether auto-loading inferior specific libthread_db is enabled."), _("\
2119If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\
2120locations to load libthread_db compatible with the inferior.\n\
2121Standard system libthread_db still gets loaded even with this option off.\n\
2122This options has security implications for untrusted inferiors."),
2123 NULL, show_auto_load_thread_db,
2124 auto_load_set_cmdlist_get (),
2125 auto_load_show_cmdlist_get ());
2126
2127 add_cmd ("libthread-db", class_info, info_auto_load_libthread_db,
2128 _("Print the list of loaded inferior specific libthread_db.\n\
2129Usage: info auto-load libthread-db"),
2130 auto_load_info_cmdlist_get ());
2131
17a37d48
PP
2132 /* Add ourselves to objfile event chain. */
2133 observer_attach_new_objfile (thread_db_new_objfile);
0838fb57
DE
2134
2135 /* Add ourselves to inferior_created event chain.
2136 This is needed to handle debugging statically linked programs where
2137 the new_objfile observer won't get called for libpthread. */
2138 observer_attach_inferior_created (thread_db_inferior_created);
fb0e1ba7 2139}
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