* arch-utils.c (legacy_pc_in_sigtramp): Remove.
[deliverable/binutils-gdb.git] / gdb / linux-thread-db.c
CommitLineData
fb0e1ba7 1/* libthread_db assisted debugging support, generic parts.
1bac305b 2
6aba47ca 3 Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007
10d6c8cd 4 Free Software Foundation, Inc.
fb0e1ba7
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5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
197e01b6
EZ
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
fb0e1ba7
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22
23#include "defs.h"
24
25#include "gdb_assert.h"
26#include <dlfcn.h>
27#include "gdb_proc_service.h"
28#include "gdb_thread_db.h"
29
bda9cb72 30#include "bfd.h"
93ad78a7 31#include "exceptions.h"
fb0e1ba7
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32#include "gdbthread.h"
33#include "inferior.h"
bda9cb72
MK
34#include "symfile.h"
35#include "objfiles.h"
fb0e1ba7 36#include "target.h"
4e052eda 37#include "regcache.h"
3f47be5c 38#include "solib-svr4.h"
16451949 39#include "gdbcore.h"
0ec9a092 40#include "linux-nat.h"
fb0e1ba7 41
979894f2
NR
42#include <signal.h>
43
a2f23071
DJ
44#ifdef HAVE_GNU_LIBC_VERSION_H
45#include <gnu/libc-version.h>
46#endif
47
fb0e1ba7
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48#ifndef LIBTHREAD_DB_SO
49#define LIBTHREAD_DB_SO "libthread_db.so.1"
50#endif
51
8605d56e
AC
52/* If we're running on GNU/Linux, we must explicitly attach to any new
53 threads. */
fb0e1ba7
MK
54
55/* FIXME: There is certainly some room for improvements:
56 - Cache LWP ids.
57 - Bypass libthread_db when fetching or storing registers for
58 threads bound to a LWP. */
59
60/* This module's target vector. */
61static struct target_ops thread_db_ops;
62
63/* The target vector that we call for things this module can't handle. */
64static struct target_ops *target_beneath;
65
66/* Pointer to the next function on the objfile event chain. */
b4acd559 67static void (*target_new_objfile_chain) (struct objfile * objfile);
fb0e1ba7
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68
69/* Non-zero if we're using this module's target vector. */
70static int using_thread_db;
71
72/* Non-zero if we have determined the signals used by the threads
73 library. */
74static int thread_signals;
75static sigset_t thread_stop_set;
76static sigset_t thread_print_set;
77
78/* Structure that identifies the child process for the
79 <proc_service.h> interface. */
80static struct ps_prochandle proc_handle;
81
82/* Connection to the libthread_db library. */
83static td_thragent_t *thread_agent;
84
85/* Pointers to the libthread_db functions. */
86
87static td_err_e (*td_init_p) (void);
88
b4acd559
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89static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps,
90 td_thragent_t **ta);
fb0e1ba7
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91static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
92 td_thrhandle_t *__th);
b4acd559
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93static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta,
94 lwpid_t lwpid, td_thrhandle_t *th);
fb0e1ba7 95static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
b4acd559
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96 td_thr_iter_f *callback, void *cbdata_p,
97 td_thr_state_e state, int ti_pri,
98 sigset_t *ti_sigmask_p,
fb0e1ba7
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99 unsigned int ti_user_flags);
100static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
101 td_event_e event, td_notify_t *ptr);
102static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
103 td_thr_events_t *event);
104static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
105 td_event_msg_t *msg);
106
107static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
108static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
109 td_thrinfo_t *infop);
b4acd559
JJ
110static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th,
111 int event);
fb0e1ba7 112
3f47be5c 113static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
b4acd559
JJ
114 void *map_address,
115 size_t offset, void **address);
3f47be5c 116
fb0e1ba7
MK
117/* Location of the thread creation event breakpoint. The code at this
118 location in the child process will be called by the pthread library
119 whenever a new thread is created. By setting a special breakpoint
120 at this location, GDB can detect when a new thread is created. We
121 obtain this location via the td_ta_event_addr call. */
122static CORE_ADDR td_create_bp_addr;
123
124/* Location of the thread death event breakpoint. */
125static CORE_ADDR td_death_bp_addr;
126
127/* Prototypes for local functions. */
bda9cb72 128static void thread_db_find_new_threads (void);
5365276c
DJ
129static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
130 const td_thrinfo_t *ti_p, int verbose);
a2f23071 131static void detach_thread (ptid_t ptid, int verbose);
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MK
132\f
133
134/* Building process ids. */
135
ca6724c1
KB
136#define GET_PID(ptid) ptid_get_pid (ptid)
137#define GET_LWP(ptid) ptid_get_lwp (ptid)
138#define GET_THREAD(ptid) ptid_get_tid (ptid)
fb0e1ba7 139
ca6724c1
KB
140#define is_lwp(ptid) (GET_LWP (ptid) != 0)
141#define is_thread(ptid) (GET_THREAD (ptid) != 0)
fb0e1ba7 142
ca6724c1 143#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
fb0e1ba7
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144\f
145
5365276c
DJ
146/* Use "struct private_thread_info" to cache thread state. This is
147 a substantial optimization. */
148
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149struct private_thread_info
150{
a2f23071
DJ
151 /* Flag set when we see a TD_DEATH event for this thread. */
152 unsigned int dying:1;
153
5365276c 154 /* Cached thread state. */
b4acd559
JJ
155 unsigned int th_valid:1;
156 unsigned int ti_valid:1;
5365276c
DJ
157
158 td_thrhandle_t th;
159 td_thrinfo_t ti;
fb0e1ba7 160};
fb0e1ba7 161\f
21bf60fe 162
fb0e1ba7
MK
163static char *
164thread_db_err_str (td_err_e err)
165{
166 static char buf[64];
167
168 switch (err)
169 {
170 case TD_OK:
171 return "generic 'call succeeded'";
172 case TD_ERR:
173 return "generic error";
174 case TD_NOTHR:
175 return "no thread to satisfy query";
176 case TD_NOSV:
177 return "no sync handle to satisfy query";
178 case TD_NOLWP:
179 return "no LWP to satisfy query";
180 case TD_BADPH:
181 return "invalid process handle";
182 case TD_BADTH:
183 return "invalid thread handle";
184 case TD_BADSH:
185 return "invalid synchronization handle";
186 case TD_BADTA:
187 return "invalid thread agent";
188 case TD_BADKEY:
189 return "invalid key";
190 case TD_NOMSG:
191 return "no event message for getmsg";
192 case TD_NOFPREGS:
193 return "FPU register set not available";
194 case TD_NOLIBTHREAD:
195 return "application not linked with libthread";
196 case TD_NOEVENT:
197 return "requested event is not supported";
198 case TD_NOCAPAB:
199 return "capability not available";
200 case TD_DBERR:
201 return "debugger service failed";
202 case TD_NOAPLIC:
203 return "operation not applicable to";
204 case TD_NOTSD:
205 return "no thread-specific data for this thread";
206 case TD_MALLOC:
207 return "malloc failed";
208 case TD_PARTIALREG:
209 return "only part of register set was written/read";
210 case TD_NOXREGS:
211 return "X register set not available for this thread";
59f80f10
DJ
212#ifdef THREAD_DB_HAS_TD_NOTALLOC
213 case TD_NOTALLOC:
214 return "thread has not yet allocated TLS for given module";
215#endif
216#ifdef THREAD_DB_HAS_TD_VERSION
217 case TD_VERSION:
218 return "versions of libpthread and libthread_db do not match";
219#endif
220#ifdef THREAD_DB_HAS_TD_NOTLS
221 case TD_NOTLS:
222 return "there is no TLS segment in the given module";
223#endif
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224 default:
225 snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
226 return buf;
227 }
228}
fb0e1ba7 229\f
5365276c 230/* A callback function for td_ta_thr_iter, which we use to map all
cdbc0b18 231 threads to LWPs.
5365276c
DJ
232
233 THP is a handle to the current thread; if INFOP is not NULL, the
234 struct thread_info associated with this thread is returned in
b9b5d7ea
JJ
235 *INFOP.
236
237 If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise,
238 zero is returned to indicate success. */
5365276c
DJ
239
240static int
241thread_get_info_callback (const td_thrhandle_t *thp, void *infop)
242{
243 td_thrinfo_t ti;
244 td_err_e err;
245 struct thread_info *thread_info;
246 ptid_t thread_ptid;
247
248 err = td_thr_get_info_p (thp, &ti);
249 if (err != TD_OK)
8a3fe4f8 250 error (_("thread_get_info_callback: cannot get thread info: %s"),
5365276c
DJ
251 thread_db_err_str (err));
252
253 /* Fill the cache. */
1bac0d4d 254 thread_ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid);
5365276c
DJ
255 thread_info = find_thread_pid (thread_ptid);
256
b9b5d7ea 257 /* In the case of a zombie thread, don't continue. We don't want to
f90ef764 258 attach to it thinking it is a new thread. */
b9b5d7ea
JJ
259 if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
260 {
261 if (infop != NULL)
262 *(struct thread_info **) infop = thread_info;
f90ef764
JJ
263 if (thread_info != NULL)
264 {
265 memcpy (&thread_info->private->th, thp, sizeof (*thp));
266 thread_info->private->th_valid = 1;
267 memcpy (&thread_info->private->ti, &ti, sizeof (ti));
268 thread_info->private->ti_valid = 1;
269 }
b9b5d7ea
JJ
270 return TD_THR_ZOMBIE;
271 }
272
5365276c
DJ
273 if (thread_info == NULL)
274 {
275 /* New thread. Attach to it now (why wait?). */
276 attach_thread (thread_ptid, thp, &ti, 1);
277 thread_info = find_thread_pid (thread_ptid);
278 gdb_assert (thread_info != NULL);
279 }
280
281 memcpy (&thread_info->private->th, thp, sizeof (*thp));
282 thread_info->private->th_valid = 1;
283 memcpy (&thread_info->private->ti, &ti, sizeof (ti));
284 thread_info->private->ti_valid = 1;
285
286 if (infop != NULL)
287 *(struct thread_info **) infop = thread_info;
288
289 return 0;
290}
291
292/* Accessor functions for the thread_db information, with caching. */
fb0e1ba7 293
5365276c
DJ
294static void
295thread_db_map_id2thr (struct thread_info *thread_info, int fatal)
296{
297 td_err_e err;
298
299 if (thread_info->private->th_valid)
300 return;
301
302 err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid),
303 &thread_info->private->th);
304 if (err != TD_OK)
305 {
306 if (fatal)
8a3fe4f8 307 error (_("Cannot find thread %ld: %s"),
b4acd559
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308 (long) GET_THREAD (thread_info->ptid),
309 thread_db_err_str (err));
5365276c
DJ
310 }
311 else
312 thread_info->private->th_valid = 1;
313}
5365276c 314\f
fb0e1ba7
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315/* Convert between user-level thread ids and LWP ids. */
316
39f77062
KB
317static ptid_t
318thread_from_lwp (ptid_t ptid)
fb0e1ba7 319{
fb0e1ba7
MK
320 td_thrhandle_t th;
321 td_err_e err;
5365276c
DJ
322 struct thread_info *thread_info;
323 ptid_t thread_ptid;
fb0e1ba7 324
39f77062
KB
325 if (GET_LWP (ptid) == 0)
326 ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid));
fb0e1ba7 327
39f77062 328 gdb_assert (is_lwp (ptid));
fb0e1ba7 329
39f77062 330 err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th);
fb0e1ba7 331 if (err != TD_OK)
8a3fe4f8 332 error (_("Cannot find user-level thread for LWP %ld: %s"),
39f77062 333 GET_LWP (ptid), thread_db_err_str (err));
fb0e1ba7 334
5365276c 335 thread_info = NULL;
b9b5d7ea
JJ
336
337 /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the
338 event thread has already died. If another gdb interface has called
339 thread_alive() previously, the thread won't be found on the thread list
340 anymore. In that case, we don't want to process this ptid anymore
341 to avoid the possibility of later treating it as a newly
342 discovered thread id that we should add to the list. Thus,
343 we return a -1 ptid which is also how the thread list marks a
344 dead thread. */
345 if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE
346 && thread_info == NULL)
347 return pid_to_ptid (-1);
348
5365276c 349 gdb_assert (thread_info && thread_info->private->ti_valid);
fb0e1ba7 350
1bac0d4d
DJ
351 return ptid_build (GET_PID (ptid), GET_LWP (ptid),
352 thread_info->private->ti.ti_tid);
fb0e1ba7
MK
353}
354
39f77062
KB
355static ptid_t
356lwp_from_thread (ptid_t ptid)
fb0e1ba7 357{
1bac0d4d 358 return BUILD_LWP (GET_LWP (ptid), GET_PID (ptid));
fb0e1ba7
MK
359}
360\f
361
362void
363thread_db_init (struct target_ops *target)
364{
365 target_beneath = target;
366}
367
5220ea4c
AC
368static void *
369verbose_dlsym (void *handle, const char *name)
370{
371 void *sym = dlsym (handle, name);
372 if (sym == NULL)
8a3fe4f8 373 warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ());
5220ea4c
AC
374 return sym;
375}
376
fb0e1ba7
MK
377static int
378thread_db_load (void)
379{
380 void *handle;
381 td_err_e err;
382
383 handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW);
384 if (handle == NULL)
f7c1e0f3 385 {
b4acd559 386 fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n",
f7c1e0f3 387 LIBTHREAD_DB_SO, dlerror ());
b4acd559 388 fprintf_filtered (gdb_stderr,
f7c1e0f3
MS
389 "GDB will not be able to debug pthreads.\n\n");
390 return 0;
391 }
fb0e1ba7
MK
392
393 /* Initialize pointers to the dynamic library functions we will use.
394 Essential functions first. */
395
5220ea4c 396 td_init_p = verbose_dlsym (handle, "td_init");
fb0e1ba7
MK
397 if (td_init_p == NULL)
398 return 0;
399
5220ea4c 400 td_ta_new_p = verbose_dlsym (handle, "td_ta_new");
fb0e1ba7
MK
401 if (td_ta_new_p == NULL)
402 return 0;
403
5220ea4c 404 td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr");
fb0e1ba7
MK
405 if (td_ta_map_id2thr_p == NULL)
406 return 0;
407
5220ea4c 408 td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr");
fb0e1ba7
MK
409 if (td_ta_map_lwp2thr_p == NULL)
410 return 0;
411
5220ea4c 412 td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter");
fb0e1ba7
MK
413 if (td_ta_thr_iter_p == NULL)
414 return 0;
415
5220ea4c 416 td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate");
fb0e1ba7
MK
417 if (td_thr_validate_p == NULL)
418 return 0;
419
5220ea4c 420 td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info");
fb0e1ba7
MK
421 if (td_thr_get_info_p == NULL)
422 return 0;
423
fb0e1ba7
MK
424 /* Initialize the library. */
425 err = td_init_p ();
426 if (err != TD_OK)
427 {
8a3fe4f8 428 warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err));
fb0e1ba7
MK
429 return 0;
430 }
431
432 /* These are not essential. */
433 td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr");
434 td_ta_set_event_p = dlsym (handle, "td_ta_set_event");
435 td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg");
436 td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable");
3f47be5c 437 td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr");
fb0e1ba7
MK
438
439 return 1;
440}
441
cdbc0b18 442static td_err_e
24557e30
AC
443enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp)
444{
445 td_notify_t notify;
cdbc0b18 446 td_err_e err;
24557e30
AC
447
448 /* Get the breakpoint address for thread EVENT. */
449 err = td_ta_event_addr_p (thread_agent, event, &notify);
450 if (err != TD_OK)
cdbc0b18 451 return err;
24557e30
AC
452
453 /* Set up the breakpoint. */
16451949
AS
454 gdb_assert (exec_bfd);
455 (*bp) = (gdbarch_convert_from_func_ptr_addr
456 (current_gdbarch,
457 /* Do proper sign extension for the target. */
458 (bfd_get_sign_extend_vma (exec_bfd) > 0
459 ? (CORE_ADDR) (intptr_t) notify.u.bptaddr
460 : (CORE_ADDR) (uintptr_t) notify.u.bptaddr),
461 &current_target));
24557e30
AC
462 create_thread_event_breakpoint ((*bp));
463
cdbc0b18 464 return TD_OK;
24557e30
AC
465}
466
fb0e1ba7
MK
467static void
468enable_thread_event_reporting (void)
469{
470 td_thr_events_t events;
471 td_notify_t notify;
472 td_err_e err;
a2f23071
DJ
473#ifdef HAVE_GNU_LIBC_VERSION_H
474 const char *libc_version;
475 int libc_major, libc_minor;
476#endif
fb0e1ba7
MK
477
478 /* We cannot use the thread event reporting facility if these
479 functions aren't available. */
480 if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL
481 || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL)
482 return;
483
484 /* Set the process wide mask saying which events we're interested in. */
485 td_event_emptyset (&events);
486 td_event_addset (&events, TD_CREATE);
a2f23071
DJ
487
488#ifdef HAVE_GNU_LIBC_VERSION_H
fb0e1ba7
MK
489 /* FIXME: kettenis/2000-04-23: The event reporting facility is
490 broken for TD_DEATH events in glibc 2.1.3, so don't enable it for
491 now. */
a2f23071
DJ
492 libc_version = gnu_get_libc_version ();
493 if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2
494 && (libc_major > 2 || (libc_major == 2 && libc_minor > 1)))
fb0e1ba7 495#endif
a2f23071 496 td_event_addset (&events, TD_DEATH);
fb0e1ba7
MK
497
498 err = td_ta_set_event_p (thread_agent, &events);
499 if (err != TD_OK)
500 {
8a3fe4f8 501 warning (_("Unable to set global thread event mask: %s"),
fb0e1ba7
MK
502 thread_db_err_str (err));
503 return;
504 }
505
506 /* Delete previous thread event breakpoints, if any. */
507 remove_thread_event_breakpoints ();
24557e30
AC
508 td_create_bp_addr = 0;
509 td_death_bp_addr = 0;
fb0e1ba7 510
24557e30 511 /* Set up the thread creation event. */
cdbc0b18
RM
512 err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr);
513 if (err != TD_OK)
fb0e1ba7 514 {
8a3fe4f8 515 warning (_("Unable to get location for thread creation breakpoint: %s"),
fb0e1ba7
MK
516 thread_db_err_str (err));
517 return;
518 }
519
24557e30 520 /* Set up the thread death event. */
cdbc0b18
RM
521 err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr);
522 if (err != TD_OK)
fb0e1ba7 523 {
8a3fe4f8 524 warning (_("Unable to get location for thread death breakpoint: %s"),
fb0e1ba7
MK
525 thread_db_err_str (err));
526 return;
527 }
fb0e1ba7
MK
528}
529
530static void
531disable_thread_event_reporting (void)
532{
533 td_thr_events_t events;
534
535 /* Set the process wide mask saying we aren't interested in any
536 events anymore. */
537 td_event_emptyset (&events);
538 td_ta_set_event_p (thread_agent, &events);
539
540 /* Delete thread event breakpoints, if any. */
541 remove_thread_event_breakpoints ();
542 td_create_bp_addr = 0;
543 td_death_bp_addr = 0;
544}
545
546static void
547check_thread_signals (void)
548{
549#ifdef GET_THREAD_SIGNALS
21bf60fe 550 if (!thread_signals)
fb0e1ba7
MK
551 {
552 sigset_t mask;
553 int i;
554
555 GET_THREAD_SIGNALS (&mask);
556 sigemptyset (&thread_stop_set);
557 sigemptyset (&thread_print_set);
558
b9569773 559 for (i = 1; i < NSIG; i++)
fb0e1ba7
MK
560 {
561 if (sigismember (&mask, i))
562 {
563 if (signal_stop_update (target_signal_from_host (i), 0))
564 sigaddset (&thread_stop_set, i);
565 if (signal_print_update (target_signal_from_host (i), 0))
566 sigaddset (&thread_print_set, i);
567 thread_signals = 1;
568 }
569 }
570 }
571#endif
572}
573
0ec9a092
DJ
574/* Check whether thread_db is usable. This function is called when
575 an inferior is created (or otherwise acquired, e.g. attached to)
576 and when new shared libraries are loaded into a running process. */
577
578void
579check_for_thread_db (void)
fb0e1ba7
MK
580{
581 td_err_e err;
0ec9a092 582 static int already_loaded;
fb0e1ba7 583
b5057acd
DJ
584 /* Do nothing if we couldn't load libthread_db.so.1. */
585 if (td_ta_new_p == NULL)
586 return;
587
5220ea4c
AC
588 /* First time through, report that libthread_db was successfuly
589 loaded. Can't print this in in thread_db_load as, at that stage,
0ec9a092 590 the interpreter and it's console haven't started. */
5220ea4c 591
0ec9a092 592 if (!already_loaded)
bda9cb72 593 {
0ec9a092
DJ
594 Dl_info info;
595 const char *library = NULL;
596 if (dladdr ((*td_ta_new_p), &info) != 0)
597 library = info.dli_fname;
598
599 /* Try dlinfo? */
600
601 if (library == NULL)
602 /* Paranoid - don't let a NULL path slip through. */
603 library = LIBTHREAD_DB_SO;
c194fbe1 604
0ec9a092
DJ
605 printf_unfiltered (_("Using host libthread_db library \"%s\".\n"),
606 library);
607 already_loaded = 1;
bda9cb72
MK
608 }
609
fb0e1ba7
MK
610 if (using_thread_db)
611 /* Nothing to do. The thread library was already detected and the
612 target vector was already activated. */
0ec9a092 613 return;
fb0e1ba7 614
0ec9a092
DJ
615 /* Don't attempt to use thread_db on targets which can not run
616 (executables not running yet, core files) for now. */
617 if (!target_has_execution)
618 return;
619
f86172a5
UW
620 /* Don't attempt to use thread_db for remote targets. */
621 if (!target_can_run (&current_target))
622 return;
623
0ec9a092 624 /* Initialize the structure that identifies the child process. */
39f77062 625 proc_handle.pid = GET_PID (inferior_ptid);
fb0e1ba7 626
bda9cb72 627 /* Now attempt to open a connection to the thread library. */
fb0e1ba7
MK
628 err = td_ta_new_p (&proc_handle, &thread_agent);
629 switch (err)
630 {
631 case TD_NOLIBTHREAD:
bda9cb72 632 /* No thread library was detected. */
fb0e1ba7
MK
633 break;
634
635 case TD_OK:
a3f17187 636 printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
5220ea4c 637
bda9cb72
MK
638 /* The thread library was detected. Activate the thread_db target. */
639 push_target (&thread_db_ops);
640 using_thread_db = 1;
641
95575b2e
AC
642 enable_thread_event_reporting ();
643 thread_db_find_new_threads ();
fb0e1ba7
MK
644 break;
645
646 default:
8a3fe4f8 647 warning (_("Cannot initialize thread debugging library: %s"),
fb0e1ba7
MK
648 thread_db_err_str (err));
649 break;
650 }
0ec9a092
DJ
651}
652
653static void
654thread_db_new_objfile (struct objfile *objfile)
655{
656 if (objfile != NULL)
657 check_for_thread_db ();
fb0e1ba7 658
540af400
MS
659 if (target_new_objfile_chain)
660 target_new_objfile_chain (objfile);
fb0e1ba7
MK
661}
662
a2f23071
DJ
663/* Attach to a new thread. This function is called when we receive a
664 TD_CREATE event or when we iterate over all threads and find one
665 that wasn't already in our list. */
666
fb0e1ba7 667static void
39f77062 668attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
fb0e1ba7
MK
669 const td_thrinfo_t *ti_p, int verbose)
670{
671 struct thread_info *tp;
672 td_err_e err;
673
a2f23071
DJ
674 /* If we're being called after a TD_CREATE event, we may already
675 know about this thread. There are two ways this can happen. We
676 may have iterated over all threads between the thread creation
677 and the TD_CREATE event, for instance when the user has issued
678 the `info threads' command before the SIGTRAP for hitting the
679 thread creation breakpoint was reported. Alternatively, the
680 thread may have exited and a new one been created with the same
681 thread ID. In the first case we don't need to do anything; in
682 the second case we should discard information about the dead
683 thread and attach to the new one. */
684 if (in_thread_list (ptid))
685 {
686 tp = find_thread_pid (ptid);
687 gdb_assert (tp != NULL);
688
689 if (!tp->private->dying)
690 return;
691
692 delete_thread (ptid);
693 }
694
fb0e1ba7
MK
695 check_thread_signals ();
696
9ee57c33
DJ
697 if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
698 return; /* A zombie thread -- do not attach. */
699
700 /* Under GNU/Linux, we have to attach to each and every thread. */
701 if (lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0) < 0)
702 return;
703
fb0e1ba7 704 /* Add the thread to GDB's thread list. */
39f77062 705 tp = add_thread (ptid);
fb0e1ba7 706 tp->private = xmalloc (sizeof (struct private_thread_info));
5365276c
DJ
707 memset (tp->private, 0, sizeof (struct private_thread_info));
708
709 if (verbose)
a3f17187 710 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
fb0e1ba7 711
fb0e1ba7
MK
712 /* Enable thread event reporting for this thread. */
713 err = td_thr_event_enable_p (th_p, 1);
714 if (err != TD_OK)
8a3fe4f8 715 error (_("Cannot enable thread event reporting for %s: %s"),
39f77062 716 target_pid_to_str (ptid), thread_db_err_str (err));
fb0e1ba7
MK
717}
718
c194fbe1
MK
719static void
720thread_db_attach (char *args, int from_tty)
721{
722 target_beneath->to_attach (args, from_tty);
723
724 /* Destroy thread info; it's no longer valid. */
725 init_thread_list ();
726
727 /* The child process is now the actual multi-threaded
728 program. Snatch its process ID... */
729 proc_handle.pid = GET_PID (inferior_ptid);
730
731 /* ...and perform the remaining initialization steps. */
732 enable_thread_event_reporting ();
b4acd559 733 thread_db_find_new_threads ();
c194fbe1
MK
734}
735
fb0e1ba7 736static void
39f77062 737detach_thread (ptid_t ptid, int verbose)
fb0e1ba7 738{
a2f23071
DJ
739 struct thread_info *thread_info;
740
fb0e1ba7 741 if (verbose)
a3f17187 742 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid));
a2f23071
DJ
743
744 /* Don't delete the thread now, because it still reports as active
745 until it has executed a few instructions after the event
746 breakpoint - if we deleted it now, "info threads" would cause us
747 to re-attach to it. Just mark it as having had a TD_DEATH
748 event. This means that we won't delete it from our thread list
749 until we notice that it's dead (via prune_threads), or until
750 something re-uses its thread ID. */
751 thread_info = find_thread_pid (ptid);
752 gdb_assert (thread_info != NULL);
753 thread_info->private->dying = 1;
fb0e1ba7
MK
754}
755
756static void
757thread_db_detach (char *args, int from_tty)
758{
759 disable_thread_event_reporting ();
c194fbe1
MK
760
761 /* There's no need to save & restore inferior_ptid here, since the
762 inferior is supposed to be survive this function call. */
763 inferior_ptid = lwp_from_thread (inferior_ptid);
764
765 /* Forget about the child's process ID. We shouldn't need it
766 anymore. */
767 proc_handle.pid = 0;
fb0e1ba7
MK
768
769 target_beneath->to_detach (args, from_tty);
770}
771
5365276c
DJ
772static int
773clear_lwpid_callback (struct thread_info *thread, void *dummy)
774{
775 /* If we know that our thread implementation is 1-to-1, we could save
776 a certain amount of information; it's not clear how much, so we
777 are always conservative. */
778
779 thread->private->th_valid = 0;
780 thread->private->ti_valid = 0;
781
782 return 0;
783}
784
fb0e1ba7 785static void
39f77062 786thread_db_resume (ptid_t ptid, int step, enum target_signal signo)
fb0e1ba7 787{
39f77062 788 struct cleanup *old_chain = save_inferior_ptid ();
fb0e1ba7 789
39f77062
KB
790 if (GET_PID (ptid) == -1)
791 inferior_ptid = lwp_from_thread (inferior_ptid);
792 else if (is_thread (ptid))
793 ptid = lwp_from_thread (ptid);
fb0e1ba7 794
5365276c
DJ
795 /* Clear cached data which may not be valid after the resume. */
796 iterate_over_threads (clear_lwpid_callback, NULL);
797
39f77062 798 target_beneath->to_resume (ptid, step, signo);
fb0e1ba7
MK
799
800 do_cleanups (old_chain);
801}
802
803/* Check if PID is currently stopped at the location of a thread event
804 breakpoint location. If it is, read the event message and act upon
805 the event. */
806
807static void
39f77062 808check_event (ptid_t ptid)
fb0e1ba7
MK
809{
810 td_event_msg_t msg;
811 td_thrinfo_t ti;
812 td_err_e err;
813 CORE_ADDR stop_pc;
4d9850d3 814 int loop = 0;
fb0e1ba7
MK
815
816 /* Bail out early if we're not at a thread event breakpoint. */
39f77062 817 stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK;
fb0e1ba7
MK
818 if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr)
819 return;
820
4d9850d3
JJ
821 /* If we are at a create breakpoint, we do not know what new lwp
822 was created and cannot specifically locate the event message for it.
823 We have to call td_ta_event_getmsg() to get
824 the latest message. Since we have no way of correlating whether
cdbc0b18 825 the event message we get back corresponds to our breakpoint, we must
4d9850d3 826 loop and read all event messages, processing them appropriately.
cdbc0b18
RM
827 This guarantees we will process the correct message before continuing
828 from the breakpoint.
4d9850d3
JJ
829
830 Currently, death events are not enabled. If they are enabled,
831 the death event can use the td_thr_event_getmsg() interface to
832 get the message specifically for that lwp and avoid looping
833 below. */
834
835 loop = 1;
836
837 do
fb0e1ba7 838 {
4d9850d3
JJ
839 err = td_ta_event_getmsg_p (thread_agent, &msg);
840 if (err != TD_OK)
841 {
842 if (err == TD_NOMSG)
843 return;
fb0e1ba7 844
8a3fe4f8 845 error (_("Cannot get thread event message: %s"),
4d9850d3
JJ
846 thread_db_err_str (err));
847 }
fb0e1ba7 848
4d9850d3
JJ
849 err = td_thr_get_info_p (msg.th_p, &ti);
850 if (err != TD_OK)
8a3fe4f8 851 error (_("Cannot get thread info: %s"), thread_db_err_str (err));
fb0e1ba7 852
1bac0d4d 853 ptid = ptid_build (GET_PID (ptid), ti.ti_lid, ti.ti_tid);
fb0e1ba7 854
4d9850d3
JJ
855 switch (msg.event)
856 {
857 case TD_CREATE:
a2f23071
DJ
858 /* Call attach_thread whether or not we already know about a
859 thread with this thread ID. */
860 attach_thread (ptid, msg.th_p, &ti, 1);
fb0e1ba7 861
4d9850d3 862 break;
fb0e1ba7 863
4d9850d3 864 case TD_DEATH:
fb0e1ba7 865
4d9850d3 866 if (!in_thread_list (ptid))
8a3fe4f8 867 error (_("Spurious thread death event."));
fb0e1ba7 868
4d9850d3 869 detach_thread (ptid, 1);
fb0e1ba7 870
4d9850d3 871 break;
fb0e1ba7 872
4d9850d3 873 default:
8a3fe4f8 874 error (_("Spurious thread event."));
4d9850d3 875 }
fb0e1ba7 876 }
4d9850d3 877 while (loop);
fb0e1ba7
MK
878}
879
39f77062
KB
880static ptid_t
881thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
fb0e1ba7 882{
39f77062 883 extern ptid_t trap_ptid;
fb0e1ba7 884
39f77062
KB
885 if (GET_PID (ptid) != -1 && is_thread (ptid))
886 ptid = lwp_from_thread (ptid);
fb0e1ba7 887
39f77062 888 ptid = target_beneath->to_wait (ptid, ourstatus);
fb0e1ba7 889
bda9cb72
MK
890 if (proc_handle.pid == 0)
891 /* The current child process isn't the actual multi-threaded
892 program yet, so don't try to do any special thread-specific
893 post-processing and bail out early. */
39f77062 894 return ptid;
bda9cb72 895
1111f4aa
NR
896 if (ourstatus->kind == TARGET_WAITKIND_EXITED
897 || ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
39f77062 898 return pid_to_ptid (-1);
fb0e1ba7 899
3f64f7b1
DJ
900 if (ourstatus->kind == TARGET_WAITKIND_EXECD)
901 {
902 remove_thread_event_breakpoints ();
903 unpush_target (&thread_db_ops);
904 using_thread_db = 0;
905
906 return pid_to_ptid (GET_PID (ptid));
907 }
908
fb0e1ba7
MK
909 if (ourstatus->kind == TARGET_WAITKIND_STOPPED
910 && ourstatus->value.sig == TARGET_SIGNAL_TRAP)
911 /* Check for a thread event. */
39f77062 912 check_event (ptid);
fb0e1ba7 913
39f77062
KB
914 if (!ptid_equal (trap_ptid, null_ptid))
915 trap_ptid = thread_from_lwp (trap_ptid);
fb0e1ba7 916
b9b5d7ea
JJ
917 /* Change the ptid back into the higher level PID + TID format.
918 If the thread is dead and no longer on the thread list, we will
919 get back a dead ptid. This can occur if the thread death event
920 gets postponed by other simultaneous events. In such a case,
921 we want to just ignore the event and continue on. */
922 ptid = thread_from_lwp (ptid);
923 if (GET_PID (ptid) == -1)
924 ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
925
926 return ptid;
fb0e1ba7
MK
927}
928
10d6c8cd
DJ
929static LONGEST
930thread_db_xfer_partial (struct target_ops *ops, enum target_object object,
931 const char *annex, gdb_byte *readbuf,
932 const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
fb0e1ba7 933{
39f77062 934 struct cleanup *old_chain = save_inferior_ptid ();
10d6c8cd 935 LONGEST xfer;
fb0e1ba7 936
39f77062 937 if (is_thread (inferior_ptid))
fb0e1ba7
MK
938 {
939 /* FIXME: This seems to be necessary to make sure breakpoints
940 are removed. */
21bf60fe 941 if (!target_thread_alive (inferior_ptid))
39f77062 942 inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
fb0e1ba7 943 else
39f77062 944 inferior_ptid = lwp_from_thread (inferior_ptid);
fb0e1ba7
MK
945 }
946
10d6c8cd
DJ
947 xfer = target_beneath->to_xfer_partial (ops, object, annex,
948 readbuf, writebuf, offset, len);
fb0e1ba7
MK
949
950 do_cleanups (old_chain);
951 return xfer;
952}
953
fb0e1ba7
MK
954static void
955thread_db_kill (void)
956{
c194fbe1
MK
957 /* There's no need to save & restore inferior_ptid here, since the
958 inferior isn't supposed to survive this function call. */
959 inferior_ptid = lwp_from_thread (inferior_ptid);
fb0e1ba7
MK
960 target_beneath->to_kill ();
961}
962
963static void
c27cda74
AC
964thread_db_create_inferior (char *exec_file, char *allargs, char **env,
965 int from_tty)
fb0e1ba7 966{
b26a6851
AC
967 unpush_target (&thread_db_ops);
968 using_thread_db = 0;
c27cda74 969 target_beneath->to_create_inferior (exec_file, allargs, env, from_tty);
bda9cb72 970}
fb0e1ba7 971
bda9cb72 972static void
39f77062 973thread_db_post_startup_inferior (ptid_t ptid)
bda9cb72
MK
974{
975 if (proc_handle.pid == 0)
976 {
977 /* The child process is now the actual multi-threaded
978 program. Snatch its process ID... */
39f77062 979 proc_handle.pid = GET_PID (ptid);
fb0e1ba7 980
bda9cb72
MK
981 /* ...and perform the remaining initialization steps. */
982 enable_thread_event_reporting ();
21bf60fe 983 thread_db_find_new_threads ();
bda9cb72 984 }
fb0e1ba7
MK
985}
986
987static void
988thread_db_mourn_inferior (void)
989{
c194fbe1
MK
990 /* Forget about the child's process ID. We shouldn't need it
991 anymore. */
992 proc_handle.pid = 0;
fb0e1ba7
MK
993
994 target_beneath->to_mourn_inferior ();
043b2f77 995
e23fc6de
DJ
996 /* Delete the old thread event breakpoints. Do this after mourning
997 the inferior, so that we don't try to uninsert them. */
998 remove_thread_event_breakpoints ();
999
b26a6851
AC
1000 /* Detach thread_db target ops. */
1001 unpush_target (&thread_db_ops);
1002 using_thread_db = 0;
fb0e1ba7
MK
1003}
1004
fb0e1ba7
MK
1005static int
1006find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
1007{
1008 td_thrinfo_t ti;
1009 td_err_e err;
39f77062 1010 ptid_t ptid;
fb0e1ba7
MK
1011
1012 err = td_thr_get_info_p (th_p, &ti);
1013 if (err != TD_OK)
8a3fe4f8 1014 error (_("find_new_threads_callback: cannot get thread info: %s"),
3197744f 1015 thread_db_err_str (err));
fb0e1ba7 1016
21bf60fe
MK
1017 if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
1018 return 0; /* A zombie -- ignore. */
5fd913cc 1019
1bac0d4d 1020 ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid);
fb0e1ba7 1021
21bf60fe 1022 if (!in_thread_list (ptid))
39f77062 1023 attach_thread (ptid, th_p, &ti, 1);
fb0e1ba7
MK
1024
1025 return 0;
1026}
1027
1028static void
1029thread_db_find_new_threads (void)
1030{
1031 td_err_e err;
1032
1033 /* Iterate over all user-space threads to discover new threads. */
1034 err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL,
1035 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
1036 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
1037 if (err != TD_OK)
8a3fe4f8 1038 error (_("Cannot find new threads: %s"), thread_db_err_str (err));
fb0e1ba7
MK
1039}
1040
1041static char *
39f77062 1042thread_db_pid_to_str (ptid_t ptid)
fb0e1ba7 1043{
39f77062 1044 if (is_thread (ptid))
fb0e1ba7
MK
1045 {
1046 static char buf[64];
5365276c 1047 struct thread_info *thread_info;
fb0e1ba7 1048
5365276c 1049 thread_info = find_thread_pid (ptid);
28b17333
DJ
1050 if (thread_info == NULL)
1051 snprintf (buf, sizeof (buf), "Thread %ld (LWP %ld) (Missing)",
1052 GET_THREAD (ptid), GET_LWP (ptid));
fb0e1ba7 1053 else
28b17333
DJ
1054 snprintf (buf, sizeof (buf), "Thread %ld (LWP %ld)",
1055 GET_THREAD (ptid), GET_LWP (ptid));
fb0e1ba7
MK
1056
1057 return buf;
1058 }
1059
39f77062
KB
1060 if (target_beneath->to_pid_to_str (ptid))
1061 return target_beneath->to_pid_to_str (ptid);
fb0e1ba7 1062
39f77062 1063 return normal_pid_to_str (ptid);
fb0e1ba7
MK
1064}
1065
28b17333
DJ
1066/* Return a string describing the state of the thread specified by
1067 INFO. */
1068
1069static char *
1070thread_db_extra_thread_info (struct thread_info *info)
1071{
1072 if (info->private->dying)
1073 return "Exiting";
1074
1075 return NULL;
1076}
1077
b2756930
KB
1078/* Get the address of the thread local variable in load module LM which
1079 is stored at OFFSET within the thread local storage for thread PTID. */
3f47be5c
EZ
1080
1081static CORE_ADDR
b2756930
KB
1082thread_db_get_thread_local_address (ptid_t ptid,
1083 CORE_ADDR lm,
b4acd559 1084 CORE_ADDR offset)
3f47be5c
EZ
1085{
1086 if (is_thread (ptid))
1087 {
3f47be5c 1088 td_err_e err;
3f47be5c 1089 void *address;
5365276c 1090 struct thread_info *thread_info;
3f47be5c
EZ
1091
1092 /* glibc doesn't provide the needed interface. */
b4acd559 1093 if (!td_thr_tls_get_addr_p)
109c3e39
AC
1094 throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
1095 _("No TLS library support"));
3f47be5c 1096
b2756930
KB
1097 /* Caller should have verified that lm != 0. */
1098 gdb_assert (lm != 0);
3f47be5c
EZ
1099
1100 /* Get info about the thread. */
5365276c
DJ
1101 thread_info = find_thread_pid (ptid);
1102 thread_db_map_id2thr (thread_info, 1);
1103
3f47be5c 1104 /* Finally, get the address of the variable. */
87177905
TS
1105 err = td_thr_tls_get_addr_p (&thread_info->private->th,
1106 (void *)(size_t) lm,
5365276c 1107 offset, &address);
3f47be5c
EZ
1108
1109#ifdef THREAD_DB_HAS_TD_NOTALLOC
1110 /* The memory hasn't been allocated, yet. */
1111 if (err == TD_NOTALLOC)
b4acd559
JJ
1112 /* Now, if libthread_db provided the initialization image's
1113 address, we *could* try to build a non-lvalue value from
1114 the initialization image. */
109c3e39
AC
1115 throw_error (TLS_NOT_ALLOCATED_YET_ERROR,
1116 _("TLS not allocated yet"));
3f47be5c
EZ
1117#endif
1118
1119 /* Something else went wrong. */
1120 if (err != TD_OK)
109c3e39
AC
1121 throw_error (TLS_GENERIC_ERROR,
1122 (("%s")), thread_db_err_str (err));
3f47be5c
EZ
1123
1124 /* Cast assuming host == target. Joy. */
16451949
AS
1125 /* Do proper sign extension for the target. */
1126 gdb_assert (exec_bfd);
1127 return (bfd_get_sign_extend_vma (exec_bfd) > 0
1128 ? (CORE_ADDR) (intptr_t) address
1129 : (CORE_ADDR) (uintptr_t) address);
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1130 }
1131
1132 if (target_beneath->to_get_thread_local_address)
b2756930 1133 return target_beneath->to_get_thread_local_address (ptid, lm, offset);
93ad78a7 1134 else
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1135 throw_error (TLS_GENERIC_ERROR,
1136 _("TLS not supported on this target"));
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1137}
1138
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1139static void
1140init_thread_db_ops (void)
1141{
1142 thread_db_ops.to_shortname = "multi-thread";
1143 thread_db_ops.to_longname = "multi-threaded child process.";
1144 thread_db_ops.to_doc = "Threads and pthreads support.";
c194fbe1 1145 thread_db_ops.to_attach = thread_db_attach;
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1146 thread_db_ops.to_detach = thread_db_detach;
1147 thread_db_ops.to_resume = thread_db_resume;
1148 thread_db_ops.to_wait = thread_db_wait;
10d6c8cd 1149 thread_db_ops.to_xfer_partial = thread_db_xfer_partial;
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1150 thread_db_ops.to_kill = thread_db_kill;
1151 thread_db_ops.to_create_inferior = thread_db_create_inferior;
bda9cb72 1152 thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior;
fb0e1ba7 1153 thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
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1154 thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
1155 thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
1156 thread_db_ops.to_stratum = thread_stratum;
1157 thread_db_ops.to_has_thread_control = tc_schedlock;
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1158 thread_db_ops.to_get_thread_local_address
1159 = thread_db_get_thread_local_address;
28b17333 1160 thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info;
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1161 thread_db_ops.to_magic = OPS_MAGIC;
1162}
1163
1164void
1165_initialize_thread_db (void)
1166{
1167 /* Only initialize the module if we can load libthread_db. */
1168 if (thread_db_load ())
1169 {
1170 init_thread_db_ops ();
1171 add_target (&thread_db_ops);
1172
1173 /* Add ourselves to objfile event chain. */
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1174 target_new_objfile_chain = deprecated_target_new_objfile_hook;
1175 deprecated_target_new_objfile_hook = thread_db_new_objfile;
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1176 }
1177}
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