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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
a0841d7a | 3 | Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006 |
10d6c8cd | 4 | Free Software Foundation, Inc. |
fb0e1ba7 MK |
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 MK |
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 MK |
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 MK |
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. */ | |
61 | static struct target_ops thread_db_ops; | |
62 | ||
63 | /* The target vector that we call for things this module can't handle. */ | |
64 | static struct target_ops *target_beneath; | |
65 | ||
66 | /* Pointer to the next function on the objfile event chain. */ | |
b4acd559 | 67 | static void (*target_new_objfile_chain) (struct objfile * objfile); |
fb0e1ba7 MK |
68 | |
69 | /* Non-zero if we're using this module's target vector. */ | |
70 | static int using_thread_db; | |
71 | ||
72 | /* Non-zero if we have determined the signals used by the threads | |
73 | library. */ | |
74 | static int thread_signals; | |
75 | static sigset_t thread_stop_set; | |
76 | static sigset_t thread_print_set; | |
77 | ||
78 | /* Structure that identifies the child process for the | |
79 | <proc_service.h> interface. */ | |
80 | static struct ps_prochandle proc_handle; | |
81 | ||
82 | /* Connection to the libthread_db library. */ | |
83 | static td_thragent_t *thread_agent; | |
84 | ||
85 | /* Pointers to the libthread_db functions. */ | |
86 | ||
87 | static td_err_e (*td_init_p) (void); | |
88 | ||
b4acd559 JJ |
89 | static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
90 | td_thragent_t **ta); | |
fb0e1ba7 MK |
91 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
92 | td_thrhandle_t *__th); | |
b4acd559 JJ |
93 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, |
94 | lwpid_t lwpid, td_thrhandle_t *th); | |
fb0e1ba7 | 95 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, |
b4acd559 JJ |
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 MK |
99 | unsigned int ti_user_flags); |
100 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
101 | td_event_e event, td_notify_t *ptr); | |
102 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
103 | td_thr_events_t *event); | |
104 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
105 | td_event_msg_t *msg); | |
106 | ||
107 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
108 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
109 | td_thrinfo_t *infop); | |
b4acd559 JJ |
110 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, |
111 | int event); | |
fb0e1ba7 | 112 | |
3f47be5c | 113 | static 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. */ | |
122 | static CORE_ADDR td_create_bp_addr; | |
123 | ||
124 | /* Location of the thread death event breakpoint. */ | |
125 | static CORE_ADDR td_death_bp_addr; | |
126 | ||
127 | /* Prototypes for local functions. */ | |
bda9cb72 | 128 | static void thread_db_find_new_threads (void); |
5365276c DJ |
129 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
130 | const td_thrinfo_t *ti_p, int verbose); | |
a2f23071 | 131 | static void detach_thread (ptid_t ptid, int verbose); |
fb0e1ba7 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 MK |
144 | \f |
145 | ||
5365276c DJ |
146 | /* Use "struct private_thread_info" to cache thread state. This is |
147 | a substantial optimization. */ | |
148 | ||
fb0e1ba7 MK |
149 | struct 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 |
163 | static char * |
164 | thread_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"; | |
212 | default: | |
213 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
214 | return buf; | |
215 | } | |
216 | } | |
fb0e1ba7 | 217 | \f |
5365276c | 218 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 219 | threads to LWPs. |
5365276c DJ |
220 | |
221 | THP is a handle to the current thread; if INFOP is not NULL, the | |
222 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
223 | *INFOP. |
224 | ||
225 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
226 | zero is returned to indicate success. */ | |
5365276c DJ |
227 | |
228 | static int | |
229 | thread_get_info_callback (const td_thrhandle_t *thp, void *infop) | |
230 | { | |
231 | td_thrinfo_t ti; | |
232 | td_err_e err; | |
233 | struct thread_info *thread_info; | |
234 | ptid_t thread_ptid; | |
235 | ||
236 | err = td_thr_get_info_p (thp, &ti); | |
237 | if (err != TD_OK) | |
8a3fe4f8 | 238 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
239 | thread_db_err_str (err)); |
240 | ||
241 | /* Fill the cache. */ | |
1bac0d4d | 242 | thread_ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid); |
5365276c DJ |
243 | thread_info = find_thread_pid (thread_ptid); |
244 | ||
b9b5d7ea | 245 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 246 | attach to it thinking it is a new thread. */ |
b9b5d7ea JJ |
247 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
248 | { | |
249 | if (infop != NULL) | |
250 | *(struct thread_info **) infop = thread_info; | |
f90ef764 JJ |
251 | if (thread_info != NULL) |
252 | { | |
253 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
254 | thread_info->private->th_valid = 1; | |
255 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
256 | thread_info->private->ti_valid = 1; | |
257 | } | |
b9b5d7ea JJ |
258 | return TD_THR_ZOMBIE; |
259 | } | |
260 | ||
5365276c DJ |
261 | if (thread_info == NULL) |
262 | { | |
263 | /* New thread. Attach to it now (why wait?). */ | |
264 | attach_thread (thread_ptid, thp, &ti, 1); | |
265 | thread_info = find_thread_pid (thread_ptid); | |
266 | gdb_assert (thread_info != NULL); | |
267 | } | |
268 | ||
269 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
270 | thread_info->private->th_valid = 1; | |
271 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
272 | thread_info->private->ti_valid = 1; | |
273 | ||
274 | if (infop != NULL) | |
275 | *(struct thread_info **) infop = thread_info; | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | /* Accessor functions for the thread_db information, with caching. */ | |
fb0e1ba7 | 281 | |
5365276c DJ |
282 | static void |
283 | thread_db_map_id2thr (struct thread_info *thread_info, int fatal) | |
284 | { | |
285 | td_err_e err; | |
286 | ||
287 | if (thread_info->private->th_valid) | |
288 | return; | |
289 | ||
290 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid), | |
291 | &thread_info->private->th); | |
292 | if (err != TD_OK) | |
293 | { | |
294 | if (fatal) | |
8a3fe4f8 | 295 | error (_("Cannot find thread %ld: %s"), |
b4acd559 JJ |
296 | (long) GET_THREAD (thread_info->ptid), |
297 | thread_db_err_str (err)); | |
5365276c DJ |
298 | } |
299 | else | |
300 | thread_info->private->th_valid = 1; | |
301 | } | |
5365276c | 302 | \f |
fb0e1ba7 MK |
303 | /* Convert between user-level thread ids and LWP ids. */ |
304 | ||
39f77062 KB |
305 | static ptid_t |
306 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 307 | { |
fb0e1ba7 MK |
308 | td_thrhandle_t th; |
309 | td_err_e err; | |
5365276c DJ |
310 | struct thread_info *thread_info; |
311 | ptid_t thread_ptid; | |
fb0e1ba7 | 312 | |
39f77062 KB |
313 | if (GET_LWP (ptid) == 0) |
314 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); | |
fb0e1ba7 | 315 | |
39f77062 | 316 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 317 | |
39f77062 | 318 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
fb0e1ba7 | 319 | if (err != TD_OK) |
8a3fe4f8 | 320 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 321 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 322 | |
5365276c | 323 | thread_info = NULL; |
b9b5d7ea JJ |
324 | |
325 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the | |
326 | event thread has already died. If another gdb interface has called | |
327 | thread_alive() previously, the thread won't be found on the thread list | |
328 | anymore. In that case, we don't want to process this ptid anymore | |
329 | to avoid the possibility of later treating it as a newly | |
330 | discovered thread id that we should add to the list. Thus, | |
331 | we return a -1 ptid which is also how the thread list marks a | |
332 | dead thread. */ | |
333 | if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE | |
334 | && thread_info == NULL) | |
335 | return pid_to_ptid (-1); | |
336 | ||
5365276c | 337 | gdb_assert (thread_info && thread_info->private->ti_valid); |
fb0e1ba7 | 338 | |
1bac0d4d DJ |
339 | return ptid_build (GET_PID (ptid), GET_LWP (ptid), |
340 | thread_info->private->ti.ti_tid); | |
fb0e1ba7 MK |
341 | } |
342 | ||
39f77062 KB |
343 | static ptid_t |
344 | lwp_from_thread (ptid_t ptid) | |
fb0e1ba7 | 345 | { |
1bac0d4d | 346 | return BUILD_LWP (GET_LWP (ptid), GET_PID (ptid)); |
fb0e1ba7 MK |
347 | } |
348 | \f | |
349 | ||
350 | void | |
351 | thread_db_init (struct target_ops *target) | |
352 | { | |
353 | target_beneath = target; | |
354 | } | |
355 | ||
5220ea4c AC |
356 | static void * |
357 | verbose_dlsym (void *handle, const char *name) | |
358 | { | |
359 | void *sym = dlsym (handle, name); | |
360 | if (sym == NULL) | |
8a3fe4f8 | 361 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ()); |
5220ea4c AC |
362 | return sym; |
363 | } | |
364 | ||
fb0e1ba7 MK |
365 | static int |
366 | thread_db_load (void) | |
367 | { | |
368 | void *handle; | |
369 | td_err_e err; | |
370 | ||
371 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
372 | if (handle == NULL) | |
f7c1e0f3 | 373 | { |
b4acd559 | 374 | fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
f7c1e0f3 | 375 | LIBTHREAD_DB_SO, dlerror ()); |
b4acd559 | 376 | fprintf_filtered (gdb_stderr, |
f7c1e0f3 MS |
377 | "GDB will not be able to debug pthreads.\n\n"); |
378 | return 0; | |
379 | } | |
fb0e1ba7 MK |
380 | |
381 | /* Initialize pointers to the dynamic library functions we will use. | |
382 | Essential functions first. */ | |
383 | ||
5220ea4c | 384 | td_init_p = verbose_dlsym (handle, "td_init"); |
fb0e1ba7 MK |
385 | if (td_init_p == NULL) |
386 | return 0; | |
387 | ||
5220ea4c | 388 | td_ta_new_p = verbose_dlsym (handle, "td_ta_new"); |
fb0e1ba7 MK |
389 | if (td_ta_new_p == NULL) |
390 | return 0; | |
391 | ||
5220ea4c | 392 | td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr"); |
fb0e1ba7 MK |
393 | if (td_ta_map_id2thr_p == NULL) |
394 | return 0; | |
395 | ||
5220ea4c | 396 | td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr"); |
fb0e1ba7 MK |
397 | if (td_ta_map_lwp2thr_p == NULL) |
398 | return 0; | |
399 | ||
5220ea4c | 400 | td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter"); |
fb0e1ba7 MK |
401 | if (td_ta_thr_iter_p == NULL) |
402 | return 0; | |
403 | ||
5220ea4c | 404 | td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate"); |
fb0e1ba7 MK |
405 | if (td_thr_validate_p == NULL) |
406 | return 0; | |
407 | ||
5220ea4c | 408 | td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info"); |
fb0e1ba7 MK |
409 | if (td_thr_get_info_p == NULL) |
410 | return 0; | |
411 | ||
fb0e1ba7 MK |
412 | /* Initialize the library. */ |
413 | err = td_init_p (); | |
414 | if (err != TD_OK) | |
415 | { | |
8a3fe4f8 | 416 | warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err)); |
fb0e1ba7 MK |
417 | return 0; |
418 | } | |
419 | ||
420 | /* These are not essential. */ | |
421 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
422 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
423 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
424 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
3f47be5c | 425 | td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
fb0e1ba7 MK |
426 | |
427 | return 1; | |
428 | } | |
429 | ||
cdbc0b18 | 430 | static td_err_e |
24557e30 AC |
431 | enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp) |
432 | { | |
433 | td_notify_t notify; | |
cdbc0b18 | 434 | td_err_e err; |
24557e30 AC |
435 | |
436 | /* Get the breakpoint address for thread EVENT. */ | |
437 | err = td_ta_event_addr_p (thread_agent, event, ¬ify); | |
438 | if (err != TD_OK) | |
cdbc0b18 | 439 | return err; |
24557e30 AC |
440 | |
441 | /* Set up the breakpoint. */ | |
16451949 AS |
442 | gdb_assert (exec_bfd); |
443 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
444 | (current_gdbarch, | |
445 | /* Do proper sign extension for the target. */ | |
446 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
447 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
448 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
449 | ¤t_target)); | |
24557e30 AC |
450 | create_thread_event_breakpoint ((*bp)); |
451 | ||
cdbc0b18 | 452 | return TD_OK; |
24557e30 AC |
453 | } |
454 | ||
fb0e1ba7 MK |
455 | static void |
456 | enable_thread_event_reporting (void) | |
457 | { | |
458 | td_thr_events_t events; | |
459 | td_notify_t notify; | |
460 | td_err_e err; | |
a2f23071 DJ |
461 | #ifdef HAVE_GNU_LIBC_VERSION_H |
462 | const char *libc_version; | |
463 | int libc_major, libc_minor; | |
464 | #endif | |
fb0e1ba7 MK |
465 | |
466 | /* We cannot use the thread event reporting facility if these | |
467 | functions aren't available. */ | |
468 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
469 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
470 | return; | |
471 | ||
472 | /* Set the process wide mask saying which events we're interested in. */ | |
473 | td_event_emptyset (&events); | |
474 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
475 | |
476 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
fb0e1ba7 MK |
477 | /* FIXME: kettenis/2000-04-23: The event reporting facility is |
478 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
479 | now. */ | |
a2f23071 DJ |
480 | libc_version = gnu_get_libc_version (); |
481 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
482 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 483 | #endif |
a2f23071 | 484 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 MK |
485 | |
486 | err = td_ta_set_event_p (thread_agent, &events); | |
487 | if (err != TD_OK) | |
488 | { | |
8a3fe4f8 | 489 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
490 | thread_db_err_str (err)); |
491 | return; | |
492 | } | |
493 | ||
494 | /* Delete previous thread event breakpoints, if any. */ | |
495 | remove_thread_event_breakpoints (); | |
24557e30 AC |
496 | td_create_bp_addr = 0; |
497 | td_death_bp_addr = 0; | |
fb0e1ba7 | 498 | |
24557e30 | 499 | /* Set up the thread creation event. */ |
cdbc0b18 RM |
500 | err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr); |
501 | if (err != TD_OK) | |
fb0e1ba7 | 502 | { |
8a3fe4f8 | 503 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
504 | thread_db_err_str (err)); |
505 | return; | |
506 | } | |
507 | ||
24557e30 | 508 | /* Set up the thread death event. */ |
cdbc0b18 RM |
509 | err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr); |
510 | if (err != TD_OK) | |
fb0e1ba7 | 511 | { |
8a3fe4f8 | 512 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
513 | thread_db_err_str (err)); |
514 | return; | |
515 | } | |
fb0e1ba7 MK |
516 | } |
517 | ||
518 | static void | |
519 | disable_thread_event_reporting (void) | |
520 | { | |
521 | td_thr_events_t events; | |
522 | ||
523 | /* Set the process wide mask saying we aren't interested in any | |
524 | events anymore. */ | |
525 | td_event_emptyset (&events); | |
526 | td_ta_set_event_p (thread_agent, &events); | |
527 | ||
528 | /* Delete thread event breakpoints, if any. */ | |
529 | remove_thread_event_breakpoints (); | |
530 | td_create_bp_addr = 0; | |
531 | td_death_bp_addr = 0; | |
532 | } | |
533 | ||
534 | static void | |
535 | check_thread_signals (void) | |
536 | { | |
537 | #ifdef GET_THREAD_SIGNALS | |
21bf60fe | 538 | if (!thread_signals) |
fb0e1ba7 MK |
539 | { |
540 | sigset_t mask; | |
541 | int i; | |
542 | ||
543 | GET_THREAD_SIGNALS (&mask); | |
544 | sigemptyset (&thread_stop_set); | |
545 | sigemptyset (&thread_print_set); | |
546 | ||
b9569773 | 547 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
548 | { |
549 | if (sigismember (&mask, i)) | |
550 | { | |
551 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
552 | sigaddset (&thread_stop_set, i); | |
553 | if (signal_print_update (target_signal_from_host (i), 0)) | |
554 | sigaddset (&thread_print_set, i); | |
555 | thread_signals = 1; | |
556 | } | |
557 | } | |
558 | } | |
559 | #endif | |
560 | } | |
561 | ||
0ec9a092 DJ |
562 | /* Check whether thread_db is usable. This function is called when |
563 | an inferior is created (or otherwise acquired, e.g. attached to) | |
564 | and when new shared libraries are loaded into a running process. */ | |
565 | ||
566 | void | |
567 | check_for_thread_db (void) | |
fb0e1ba7 MK |
568 | { |
569 | td_err_e err; | |
0ec9a092 | 570 | static int already_loaded; |
fb0e1ba7 | 571 | |
5220ea4c AC |
572 | /* First time through, report that libthread_db was successfuly |
573 | loaded. Can't print this in in thread_db_load as, at that stage, | |
0ec9a092 | 574 | the interpreter and it's console haven't started. */ |
5220ea4c | 575 | |
0ec9a092 | 576 | if (!already_loaded) |
bda9cb72 | 577 | { |
0ec9a092 DJ |
578 | Dl_info info; |
579 | const char *library = NULL; | |
580 | if (dladdr ((*td_ta_new_p), &info) != 0) | |
581 | library = info.dli_fname; | |
582 | ||
583 | /* Try dlinfo? */ | |
584 | ||
585 | if (library == NULL) | |
586 | /* Paranoid - don't let a NULL path slip through. */ | |
587 | library = LIBTHREAD_DB_SO; | |
c194fbe1 | 588 | |
0ec9a092 DJ |
589 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
590 | library); | |
591 | already_loaded = 1; | |
bda9cb72 MK |
592 | } |
593 | ||
fb0e1ba7 MK |
594 | if (using_thread_db) |
595 | /* Nothing to do. The thread library was already detected and the | |
596 | target vector was already activated. */ | |
0ec9a092 | 597 | return; |
fb0e1ba7 | 598 | |
0ec9a092 DJ |
599 | /* Don't attempt to use thread_db on targets which can not run |
600 | (executables not running yet, core files) for now. */ | |
601 | if (!target_has_execution) | |
602 | return; | |
603 | ||
f86172a5 UW |
604 | /* Don't attempt to use thread_db for remote targets. */ |
605 | if (!target_can_run (¤t_target)) | |
606 | return; | |
607 | ||
0ec9a092 | 608 | /* Initialize the structure that identifies the child process. */ |
39f77062 | 609 | proc_handle.pid = GET_PID (inferior_ptid); |
fb0e1ba7 | 610 | |
bda9cb72 | 611 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
612 | err = td_ta_new_p (&proc_handle, &thread_agent); |
613 | switch (err) | |
614 | { | |
615 | case TD_NOLIBTHREAD: | |
bda9cb72 | 616 | /* No thread library was detected. */ |
fb0e1ba7 MK |
617 | break; |
618 | ||
619 | case TD_OK: | |
a3f17187 | 620 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
5220ea4c | 621 | |
bda9cb72 MK |
622 | /* The thread library was detected. Activate the thread_db target. */ |
623 | push_target (&thread_db_ops); | |
624 | using_thread_db = 1; | |
625 | ||
95575b2e AC |
626 | enable_thread_event_reporting (); |
627 | thread_db_find_new_threads (); | |
fb0e1ba7 MK |
628 | break; |
629 | ||
630 | default: | |
8a3fe4f8 | 631 | warning (_("Cannot initialize thread debugging library: %s"), |
fb0e1ba7 MK |
632 | thread_db_err_str (err)); |
633 | break; | |
634 | } | |
0ec9a092 DJ |
635 | } |
636 | ||
637 | static void | |
638 | thread_db_new_objfile (struct objfile *objfile) | |
639 | { | |
640 | if (objfile != NULL) | |
641 | check_for_thread_db (); | |
fb0e1ba7 | 642 | |
540af400 MS |
643 | if (target_new_objfile_chain) |
644 | target_new_objfile_chain (objfile); | |
fb0e1ba7 MK |
645 | } |
646 | ||
a2f23071 DJ |
647 | /* Attach to a new thread. This function is called when we receive a |
648 | TD_CREATE event or when we iterate over all threads and find one | |
649 | that wasn't already in our list. */ | |
650 | ||
fb0e1ba7 | 651 | static void |
39f77062 | 652 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
fb0e1ba7 MK |
653 | const td_thrinfo_t *ti_p, int verbose) |
654 | { | |
655 | struct thread_info *tp; | |
656 | td_err_e err; | |
657 | ||
a2f23071 DJ |
658 | /* If we're being called after a TD_CREATE event, we may already |
659 | know about this thread. There are two ways this can happen. We | |
660 | may have iterated over all threads between the thread creation | |
661 | and the TD_CREATE event, for instance when the user has issued | |
662 | the `info threads' command before the SIGTRAP for hitting the | |
663 | thread creation breakpoint was reported. Alternatively, the | |
664 | thread may have exited and a new one been created with the same | |
665 | thread ID. In the first case we don't need to do anything; in | |
666 | the second case we should discard information about the dead | |
667 | thread and attach to the new one. */ | |
668 | if (in_thread_list (ptid)) | |
669 | { | |
670 | tp = find_thread_pid (ptid); | |
671 | gdb_assert (tp != NULL); | |
672 | ||
673 | if (!tp->private->dying) | |
674 | return; | |
675 | ||
676 | delete_thread (ptid); | |
677 | } | |
678 | ||
fb0e1ba7 MK |
679 | check_thread_signals (); |
680 | ||
fb0e1ba7 | 681 | /* Add the thread to GDB's thread list. */ |
39f77062 | 682 | tp = add_thread (ptid); |
fb0e1ba7 | 683 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
5365276c DJ |
684 | memset (tp->private, 0, sizeof (struct private_thread_info)); |
685 | ||
686 | if (verbose) | |
a3f17187 | 687 | printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid)); |
fb0e1ba7 | 688 | |
21bf60fe MK |
689 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
690 | return; /* A zombie thread -- do not attach. */ | |
5fd913cc | 691 | |
8605d56e | 692 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
fb0e1ba7 | 693 | #ifdef ATTACH_LWP |
c194fbe1 | 694 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); |
fb0e1ba7 MK |
695 | #endif |
696 | ||
697 | /* Enable thread event reporting for this thread. */ | |
698 | err = td_thr_event_enable_p (th_p, 1); | |
699 | if (err != TD_OK) | |
8a3fe4f8 | 700 | error (_("Cannot enable thread event reporting for %s: %s"), |
39f77062 | 701 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
702 | } |
703 | ||
c194fbe1 MK |
704 | static void |
705 | thread_db_attach (char *args, int from_tty) | |
706 | { | |
707 | target_beneath->to_attach (args, from_tty); | |
708 | ||
709 | /* Destroy thread info; it's no longer valid. */ | |
710 | init_thread_list (); | |
711 | ||
712 | /* The child process is now the actual multi-threaded | |
713 | program. Snatch its process ID... */ | |
714 | proc_handle.pid = GET_PID (inferior_ptid); | |
715 | ||
716 | /* ...and perform the remaining initialization steps. */ | |
717 | enable_thread_event_reporting (); | |
b4acd559 | 718 | thread_db_find_new_threads (); |
c194fbe1 MK |
719 | } |
720 | ||
fb0e1ba7 | 721 | static void |
39f77062 | 722 | detach_thread (ptid_t ptid, int verbose) |
fb0e1ba7 | 723 | { |
a2f23071 DJ |
724 | struct thread_info *thread_info; |
725 | ||
fb0e1ba7 | 726 | if (verbose) |
a3f17187 | 727 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); |
a2f23071 DJ |
728 | |
729 | /* Don't delete the thread now, because it still reports as active | |
730 | until it has executed a few instructions after the event | |
731 | breakpoint - if we deleted it now, "info threads" would cause us | |
732 | to re-attach to it. Just mark it as having had a TD_DEATH | |
733 | event. This means that we won't delete it from our thread list | |
734 | until we notice that it's dead (via prune_threads), or until | |
735 | something re-uses its thread ID. */ | |
736 | thread_info = find_thread_pid (ptid); | |
737 | gdb_assert (thread_info != NULL); | |
738 | thread_info->private->dying = 1; | |
fb0e1ba7 MK |
739 | } |
740 | ||
741 | static void | |
742 | thread_db_detach (char *args, int from_tty) | |
743 | { | |
744 | disable_thread_event_reporting (); | |
c194fbe1 MK |
745 | |
746 | /* There's no need to save & restore inferior_ptid here, since the | |
747 | inferior is supposed to be survive this function call. */ | |
748 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
749 | ||
750 | /* Forget about the child's process ID. We shouldn't need it | |
751 | anymore. */ | |
752 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
753 | |
754 | target_beneath->to_detach (args, from_tty); | |
755 | } | |
756 | ||
5365276c DJ |
757 | static int |
758 | clear_lwpid_callback (struct thread_info *thread, void *dummy) | |
759 | { | |
760 | /* If we know that our thread implementation is 1-to-1, we could save | |
761 | a certain amount of information; it's not clear how much, so we | |
762 | are always conservative. */ | |
763 | ||
764 | thread->private->th_valid = 0; | |
765 | thread->private->ti_valid = 0; | |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
fb0e1ba7 | 770 | static void |
39f77062 | 771 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 | 772 | { |
39f77062 | 773 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 774 | |
39f77062 KB |
775 | if (GET_PID (ptid) == -1) |
776 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
777 | else if (is_thread (ptid)) | |
778 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 779 | |
5365276c DJ |
780 | /* Clear cached data which may not be valid after the resume. */ |
781 | iterate_over_threads (clear_lwpid_callback, NULL); | |
782 | ||
39f77062 | 783 | target_beneath->to_resume (ptid, step, signo); |
fb0e1ba7 MK |
784 | |
785 | do_cleanups (old_chain); | |
786 | } | |
787 | ||
788 | /* Check if PID is currently stopped at the location of a thread event | |
789 | breakpoint location. If it is, read the event message and act upon | |
790 | the event. */ | |
791 | ||
792 | static void | |
39f77062 | 793 | check_event (ptid_t ptid) |
fb0e1ba7 MK |
794 | { |
795 | td_event_msg_t msg; | |
796 | td_thrinfo_t ti; | |
797 | td_err_e err; | |
798 | CORE_ADDR stop_pc; | |
4d9850d3 | 799 | int loop = 0; |
fb0e1ba7 MK |
800 | |
801 | /* Bail out early if we're not at a thread event breakpoint. */ | |
39f77062 | 802 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
fb0e1ba7 MK |
803 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
804 | return; | |
805 | ||
4d9850d3 JJ |
806 | /* If we are at a create breakpoint, we do not know what new lwp |
807 | was created and cannot specifically locate the event message for it. | |
808 | We have to call td_ta_event_getmsg() to get | |
809 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 810 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 811 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
812 | This guarantees we will process the correct message before continuing |
813 | from the breakpoint. | |
4d9850d3 JJ |
814 | |
815 | Currently, death events are not enabled. If they are enabled, | |
816 | the death event can use the td_thr_event_getmsg() interface to | |
817 | get the message specifically for that lwp and avoid looping | |
818 | below. */ | |
819 | ||
820 | loop = 1; | |
821 | ||
822 | do | |
fb0e1ba7 | 823 | { |
4d9850d3 JJ |
824 | err = td_ta_event_getmsg_p (thread_agent, &msg); |
825 | if (err != TD_OK) | |
826 | { | |
827 | if (err == TD_NOMSG) | |
828 | return; | |
fb0e1ba7 | 829 | |
8a3fe4f8 | 830 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
831 | thread_db_err_str (err)); |
832 | } | |
fb0e1ba7 | 833 | |
4d9850d3 JJ |
834 | err = td_thr_get_info_p (msg.th_p, &ti); |
835 | if (err != TD_OK) | |
8a3fe4f8 | 836 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 837 | |
1bac0d4d | 838 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, ti.ti_tid); |
fb0e1ba7 | 839 | |
4d9850d3 JJ |
840 | switch (msg.event) |
841 | { | |
842 | case TD_CREATE: | |
a2f23071 DJ |
843 | /* Call attach_thread whether or not we already know about a |
844 | thread with this thread ID. */ | |
845 | attach_thread (ptid, msg.th_p, &ti, 1); | |
fb0e1ba7 | 846 | |
4d9850d3 | 847 | break; |
fb0e1ba7 | 848 | |
4d9850d3 | 849 | case TD_DEATH: |
fb0e1ba7 | 850 | |
4d9850d3 | 851 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 852 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 853 | |
4d9850d3 | 854 | detach_thread (ptid, 1); |
fb0e1ba7 | 855 | |
4d9850d3 | 856 | break; |
fb0e1ba7 | 857 | |
4d9850d3 | 858 | default: |
8a3fe4f8 | 859 | error (_("Spurious thread event.")); |
4d9850d3 | 860 | } |
fb0e1ba7 | 861 | } |
4d9850d3 | 862 | while (loop); |
fb0e1ba7 MK |
863 | } |
864 | ||
39f77062 KB |
865 | static ptid_t |
866 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 | 867 | { |
39f77062 | 868 | extern ptid_t trap_ptid; |
fb0e1ba7 | 869 | |
39f77062 KB |
870 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
871 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 872 | |
39f77062 | 873 | ptid = target_beneath->to_wait (ptid, ourstatus); |
fb0e1ba7 | 874 | |
bda9cb72 MK |
875 | if (proc_handle.pid == 0) |
876 | /* The current child process isn't the actual multi-threaded | |
877 | program yet, so don't try to do any special thread-specific | |
878 | post-processing and bail out early. */ | |
39f77062 | 879 | return ptid; |
bda9cb72 | 880 | |
1111f4aa NR |
881 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
882 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
39f77062 | 883 | return pid_to_ptid (-1); |
fb0e1ba7 | 884 | |
3f64f7b1 DJ |
885 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
886 | { | |
887 | remove_thread_event_breakpoints (); | |
888 | unpush_target (&thread_db_ops); | |
889 | using_thread_db = 0; | |
890 | ||
891 | return pid_to_ptid (GET_PID (ptid)); | |
892 | } | |
893 | ||
fb0e1ba7 MK |
894 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
895 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
896 | /* Check for a thread event. */ | |
39f77062 | 897 | check_event (ptid); |
fb0e1ba7 | 898 | |
39f77062 KB |
899 | if (!ptid_equal (trap_ptid, null_ptid)) |
900 | trap_ptid = thread_from_lwp (trap_ptid); | |
fb0e1ba7 | 901 | |
b9b5d7ea JJ |
902 | /* Change the ptid back into the higher level PID + TID format. |
903 | If the thread is dead and no longer on the thread list, we will | |
904 | get back a dead ptid. This can occur if the thread death event | |
905 | gets postponed by other simultaneous events. In such a case, | |
906 | we want to just ignore the event and continue on. */ | |
907 | ptid = thread_from_lwp (ptid); | |
908 | if (GET_PID (ptid) == -1) | |
909 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
910 | ||
911 | return ptid; | |
fb0e1ba7 MK |
912 | } |
913 | ||
10d6c8cd DJ |
914 | static LONGEST |
915 | thread_db_xfer_partial (struct target_ops *ops, enum target_object object, | |
916 | const char *annex, gdb_byte *readbuf, | |
917 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
fb0e1ba7 | 918 | { |
39f77062 | 919 | struct cleanup *old_chain = save_inferior_ptid (); |
10d6c8cd | 920 | LONGEST xfer; |
fb0e1ba7 | 921 | |
39f77062 | 922 | if (is_thread (inferior_ptid)) |
fb0e1ba7 MK |
923 | { |
924 | /* FIXME: This seems to be necessary to make sure breakpoints | |
925 | are removed. */ | |
21bf60fe | 926 | if (!target_thread_alive (inferior_ptid)) |
39f77062 | 927 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); |
fb0e1ba7 | 928 | else |
39f77062 | 929 | inferior_ptid = lwp_from_thread (inferior_ptid); |
fb0e1ba7 MK |
930 | } |
931 | ||
10d6c8cd DJ |
932 | xfer = target_beneath->to_xfer_partial (ops, object, annex, |
933 | readbuf, writebuf, offset, len); | |
fb0e1ba7 MK |
934 | |
935 | do_cleanups (old_chain); | |
936 | return xfer; | |
937 | } | |
938 | ||
fb0e1ba7 MK |
939 | static void |
940 | thread_db_kill (void) | |
941 | { | |
c194fbe1 MK |
942 | /* There's no need to save & restore inferior_ptid here, since the |
943 | inferior isn't supposed to survive this function call. */ | |
944 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
fb0e1ba7 MK |
945 | target_beneath->to_kill (); |
946 | } | |
947 | ||
948 | static void | |
c27cda74 AC |
949 | thread_db_create_inferior (char *exec_file, char *allargs, char **env, |
950 | int from_tty) | |
fb0e1ba7 | 951 | { |
b26a6851 AC |
952 | unpush_target (&thread_db_ops); |
953 | using_thread_db = 0; | |
c27cda74 | 954 | target_beneath->to_create_inferior (exec_file, allargs, env, from_tty); |
bda9cb72 | 955 | } |
fb0e1ba7 | 956 | |
bda9cb72 | 957 | static void |
39f77062 | 958 | thread_db_post_startup_inferior (ptid_t ptid) |
bda9cb72 MK |
959 | { |
960 | if (proc_handle.pid == 0) | |
961 | { | |
962 | /* The child process is now the actual multi-threaded | |
963 | program. Snatch its process ID... */ | |
39f77062 | 964 | proc_handle.pid = GET_PID (ptid); |
fb0e1ba7 | 965 | |
bda9cb72 MK |
966 | /* ...and perform the remaining initialization steps. */ |
967 | enable_thread_event_reporting (); | |
21bf60fe | 968 | thread_db_find_new_threads (); |
bda9cb72 | 969 | } |
fb0e1ba7 MK |
970 | } |
971 | ||
972 | static void | |
973 | thread_db_mourn_inferior (void) | |
974 | { | |
c194fbe1 MK |
975 | /* Forget about the child's process ID. We shouldn't need it |
976 | anymore. */ | |
977 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
978 | |
979 | target_beneath->to_mourn_inferior (); | |
043b2f77 | 980 | |
e23fc6de DJ |
981 | /* Delete the old thread event breakpoints. Do this after mourning |
982 | the inferior, so that we don't try to uninsert them. */ | |
983 | remove_thread_event_breakpoints (); | |
984 | ||
b26a6851 AC |
985 | /* Detach thread_db target ops. */ |
986 | unpush_target (&thread_db_ops); | |
987 | using_thread_db = 0; | |
fb0e1ba7 MK |
988 | } |
989 | ||
fb0e1ba7 MK |
990 | static int |
991 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
992 | { | |
993 | td_thrinfo_t ti; | |
994 | td_err_e err; | |
39f77062 | 995 | ptid_t ptid; |
fb0e1ba7 MK |
996 | |
997 | err = td_thr_get_info_p (th_p, &ti); | |
998 | if (err != TD_OK) | |
8a3fe4f8 | 999 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1000 | thread_db_err_str (err)); |
fb0e1ba7 | 1001 | |
21bf60fe MK |
1002 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1003 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1004 | |
1bac0d4d | 1005 | ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid); |
fb0e1ba7 | 1006 | |
21bf60fe | 1007 | if (!in_thread_list (ptid)) |
39f77062 | 1008 | attach_thread (ptid, th_p, &ti, 1); |
fb0e1ba7 MK |
1009 | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | static void | |
1014 | thread_db_find_new_threads (void) | |
1015 | { | |
1016 | td_err_e err; | |
1017 | ||
1018 | /* Iterate over all user-space threads to discover new threads. */ | |
1019 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
1020 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
1021 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
1022 | if (err != TD_OK) | |
8a3fe4f8 | 1023 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); |
fb0e1ba7 MK |
1024 | } |
1025 | ||
1026 | static char * | |
39f77062 | 1027 | thread_db_pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1028 | { |
39f77062 | 1029 | if (is_thread (ptid)) |
fb0e1ba7 MK |
1030 | { |
1031 | static char buf[64]; | |
5365276c | 1032 | struct thread_info *thread_info; |
fb0e1ba7 | 1033 | |
5365276c | 1034 | thread_info = find_thread_pid (ptid); |
28b17333 DJ |
1035 | if (thread_info == NULL) |
1036 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %ld) (Missing)", | |
1037 | GET_THREAD (ptid), GET_LWP (ptid)); | |
fb0e1ba7 | 1038 | else |
28b17333 DJ |
1039 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %ld)", |
1040 | GET_THREAD (ptid), GET_LWP (ptid)); | |
fb0e1ba7 MK |
1041 | |
1042 | return buf; | |
1043 | } | |
1044 | ||
39f77062 KB |
1045 | if (target_beneath->to_pid_to_str (ptid)) |
1046 | return target_beneath->to_pid_to_str (ptid); | |
fb0e1ba7 | 1047 | |
39f77062 | 1048 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1049 | } |
1050 | ||
28b17333 DJ |
1051 | /* Return a string describing the state of the thread specified by |
1052 | INFO. */ | |
1053 | ||
1054 | static char * | |
1055 | thread_db_extra_thread_info (struct thread_info *info) | |
1056 | { | |
1057 | if (info->private->dying) | |
1058 | return "Exiting"; | |
1059 | ||
1060 | return NULL; | |
1061 | } | |
1062 | ||
b2756930 KB |
1063 | /* Get the address of the thread local variable in load module LM which |
1064 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1065 | |
1066 | static CORE_ADDR | |
b2756930 KB |
1067 | thread_db_get_thread_local_address (ptid_t ptid, |
1068 | CORE_ADDR lm, | |
b4acd559 | 1069 | CORE_ADDR offset) |
3f47be5c EZ |
1070 | { |
1071 | if (is_thread (ptid)) | |
1072 | { | |
3f47be5c | 1073 | td_err_e err; |
3f47be5c | 1074 | void *address; |
5365276c | 1075 | struct thread_info *thread_info; |
3f47be5c EZ |
1076 | |
1077 | /* glibc doesn't provide the needed interface. */ | |
b4acd559 | 1078 | if (!td_thr_tls_get_addr_p) |
109c3e39 AC |
1079 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1080 | _("No TLS library support")); | |
3f47be5c | 1081 | |
b2756930 KB |
1082 | /* Caller should have verified that lm != 0. */ |
1083 | gdb_assert (lm != 0); | |
3f47be5c EZ |
1084 | |
1085 | /* Get info about the thread. */ | |
5365276c DJ |
1086 | thread_info = find_thread_pid (ptid); |
1087 | thread_db_map_id2thr (thread_info, 1); | |
1088 | ||
3f47be5c | 1089 | /* Finally, get the address of the variable. */ |
87177905 TS |
1090 | err = td_thr_tls_get_addr_p (&thread_info->private->th, |
1091 | (void *)(size_t) lm, | |
5365276c | 1092 | offset, &address); |
3f47be5c EZ |
1093 | |
1094 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1095 | /* The memory hasn't been allocated, yet. */ | |
1096 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1097 | /* Now, if libthread_db provided the initialization image's |
1098 | address, we *could* try to build a non-lvalue value from | |
1099 | the initialization image. */ | |
109c3e39 AC |
1100 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1101 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1102 | #endif |
1103 | ||
1104 | /* Something else went wrong. */ | |
1105 | if (err != TD_OK) | |
109c3e39 AC |
1106 | throw_error (TLS_GENERIC_ERROR, |
1107 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1108 | |
1109 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1110 | /* Do proper sign extension for the target. */ |
1111 | gdb_assert (exec_bfd); | |
1112 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1113 | ? (CORE_ADDR) (intptr_t) address | |
1114 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1115 | } |
1116 | ||
1117 | if (target_beneath->to_get_thread_local_address) | |
b2756930 | 1118 | return target_beneath->to_get_thread_local_address (ptid, lm, offset); |
93ad78a7 | 1119 | else |
109c3e39 AC |
1120 | throw_error (TLS_GENERIC_ERROR, |
1121 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1122 | } |
1123 | ||
fb0e1ba7 MK |
1124 | static void |
1125 | init_thread_db_ops (void) | |
1126 | { | |
1127 | thread_db_ops.to_shortname = "multi-thread"; | |
1128 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1129 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
c194fbe1 | 1130 | thread_db_ops.to_attach = thread_db_attach; |
fb0e1ba7 MK |
1131 | thread_db_ops.to_detach = thread_db_detach; |
1132 | thread_db_ops.to_resume = thread_db_resume; | |
1133 | thread_db_ops.to_wait = thread_db_wait; | |
10d6c8cd | 1134 | thread_db_ops.to_xfer_partial = thread_db_xfer_partial; |
fb0e1ba7 MK |
1135 | thread_db_ops.to_kill = thread_db_kill; |
1136 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1137 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 | 1138 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
1139 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
1140 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1141 | thread_db_ops.to_stratum = thread_stratum; | |
1142 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1143 | thread_db_ops.to_get_thread_local_address |
1144 | = thread_db_get_thread_local_address; | |
28b17333 | 1145 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
fb0e1ba7 MK |
1146 | thread_db_ops.to_magic = OPS_MAGIC; |
1147 | } | |
1148 | ||
1149 | void | |
1150 | _initialize_thread_db (void) | |
1151 | { | |
1152 | /* Only initialize the module if we can load libthread_db. */ | |
1153 | if (thread_db_load ()) | |
1154 | { | |
1155 | init_thread_db_ops (); | |
1156 | add_target (&thread_db_ops); | |
1157 | ||
1158 | /* Add ourselves to objfile event chain. */ | |
9a4105ab AC |
1159 | target_new_objfile_chain = deprecated_target_new_objfile_hook; |
1160 | deprecated_target_new_objfile_hook = thread_db_new_objfile; | |
fb0e1ba7 MK |
1161 | } |
1162 | } |