Commit | Line | Data |
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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
a2f23071 | 3 | Copyright 1999, 2000, 2001, 2003, 2004 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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | ||
24 | #include "gdb_assert.h" | |
25 | #include <dlfcn.h> | |
26 | #include "gdb_proc_service.h" | |
27 | #include "gdb_thread_db.h" | |
28 | ||
bda9cb72 | 29 | #include "bfd.h" |
fb0e1ba7 MK |
30 | #include "gdbthread.h" |
31 | #include "inferior.h" | |
bda9cb72 MK |
32 | #include "symfile.h" |
33 | #include "objfiles.h" | |
fb0e1ba7 | 34 | #include "target.h" |
4e052eda | 35 | #include "regcache.h" |
3f47be5c | 36 | #include "solib-svr4.h" |
fb0e1ba7 | 37 | |
a2f23071 DJ |
38 | #ifdef HAVE_GNU_LIBC_VERSION_H |
39 | #include <gnu/libc-version.h> | |
40 | #endif | |
41 | ||
fb0e1ba7 MK |
42 | #ifndef LIBTHREAD_DB_SO |
43 | #define LIBTHREAD_DB_SO "libthread_db.so.1" | |
44 | #endif | |
45 | ||
8605d56e AC |
46 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
47 | threads. */ | |
fb0e1ba7 MK |
48 | |
49 | /* FIXME: There is certainly some room for improvements: | |
50 | - Cache LWP ids. | |
51 | - Bypass libthread_db when fetching or storing registers for | |
52 | threads bound to a LWP. */ | |
53 | ||
54 | /* This module's target vector. */ | |
55 | static struct target_ops thread_db_ops; | |
56 | ||
57 | /* The target vector that we call for things this module can't handle. */ | |
58 | static struct target_ops *target_beneath; | |
59 | ||
60 | /* Pointer to the next function on the objfile event chain. */ | |
b4acd559 | 61 | static void (*target_new_objfile_chain) (struct objfile * objfile); |
fb0e1ba7 MK |
62 | |
63 | /* Non-zero if we're using this module's target vector. */ | |
64 | static int using_thread_db; | |
65 | ||
66 | /* Non-zero if we have determined the signals used by the threads | |
67 | library. */ | |
68 | static int thread_signals; | |
69 | static sigset_t thread_stop_set; | |
70 | static sigset_t thread_print_set; | |
71 | ||
72 | /* Structure that identifies the child process for the | |
73 | <proc_service.h> interface. */ | |
74 | static struct ps_prochandle proc_handle; | |
75 | ||
76 | /* Connection to the libthread_db library. */ | |
77 | static td_thragent_t *thread_agent; | |
78 | ||
79 | /* Pointers to the libthread_db functions. */ | |
80 | ||
81 | static td_err_e (*td_init_p) (void); | |
82 | ||
b4acd559 JJ |
83 | static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
84 | td_thragent_t **ta); | |
fb0e1ba7 MK |
85 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
86 | td_thrhandle_t *__th); | |
b4acd559 JJ |
87 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, |
88 | lwpid_t lwpid, td_thrhandle_t *th); | |
fb0e1ba7 | 89 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, |
b4acd559 JJ |
90 | td_thr_iter_f *callback, void *cbdata_p, |
91 | td_thr_state_e state, int ti_pri, | |
92 | sigset_t *ti_sigmask_p, | |
fb0e1ba7 MK |
93 | unsigned int ti_user_flags); |
94 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
95 | td_event_e event, td_notify_t *ptr); | |
96 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
97 | td_thr_events_t *event); | |
98 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
99 | td_event_msg_t *msg); | |
100 | ||
101 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
102 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
103 | td_thrinfo_t *infop); | |
104 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
105 | gdb_prfpregset_t *regset); | |
106 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
107 | prgregset_t gregs); | |
108 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
109 | const gdb_prfpregset_t *fpregs); | |
110 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
111 | prgregset_t gregs); | |
b4acd559 JJ |
112 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, |
113 | int event); | |
fb0e1ba7 | 114 | |
3f47be5c | 115 | static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
b4acd559 JJ |
116 | void *map_address, |
117 | size_t offset, void **address); | |
3f47be5c | 118 | |
fb0e1ba7 MK |
119 | /* Location of the thread creation event breakpoint. The code at this |
120 | location in the child process will be called by the pthread library | |
121 | whenever a new thread is created. By setting a special breakpoint | |
122 | at this location, GDB can detect when a new thread is created. We | |
123 | obtain this location via the td_ta_event_addr call. */ | |
124 | static CORE_ADDR td_create_bp_addr; | |
125 | ||
126 | /* Location of the thread death event breakpoint. */ | |
127 | static CORE_ADDR td_death_bp_addr; | |
128 | ||
129 | /* Prototypes for local functions. */ | |
bda9cb72 | 130 | static void thread_db_find_new_threads (void); |
5365276c DJ |
131 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
132 | const td_thrinfo_t *ti_p, int verbose); | |
a2f23071 | 133 | static void detach_thread (ptid_t ptid, int verbose); |
fb0e1ba7 MK |
134 | \f |
135 | ||
136 | /* Building process ids. */ | |
137 | ||
ca6724c1 KB |
138 | #define GET_PID(ptid) ptid_get_pid (ptid) |
139 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
140 | #define GET_THREAD(ptid) ptid_get_tid (ptid) | |
fb0e1ba7 | 141 | |
ca6724c1 KB |
142 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) |
143 | #define is_thread(ptid) (GET_THREAD (ptid) != 0) | |
fb0e1ba7 | 144 | |
ca6724c1 KB |
145 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) |
146 | #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid) | |
fb0e1ba7 MK |
147 | \f |
148 | ||
5365276c DJ |
149 | /* Use "struct private_thread_info" to cache thread state. This is |
150 | a substantial optimization. */ | |
151 | ||
fb0e1ba7 MK |
152 | struct private_thread_info |
153 | { | |
a2f23071 DJ |
154 | /* Flag set when we see a TD_DEATH event for this thread. */ |
155 | unsigned int dying:1; | |
156 | ||
5365276c | 157 | /* Cached thread state. */ |
b4acd559 JJ |
158 | unsigned int th_valid:1; |
159 | unsigned int ti_valid:1; | |
5365276c DJ |
160 | |
161 | td_thrhandle_t th; | |
162 | td_thrinfo_t ti; | |
fb0e1ba7 | 163 | }; |
fb0e1ba7 | 164 | \f |
21bf60fe | 165 | |
fb0e1ba7 MK |
166 | static char * |
167 | thread_db_err_str (td_err_e err) | |
168 | { | |
169 | static char buf[64]; | |
170 | ||
171 | switch (err) | |
172 | { | |
173 | case TD_OK: | |
174 | return "generic 'call succeeded'"; | |
175 | case TD_ERR: | |
176 | return "generic error"; | |
177 | case TD_NOTHR: | |
178 | return "no thread to satisfy query"; | |
179 | case TD_NOSV: | |
180 | return "no sync handle to satisfy query"; | |
181 | case TD_NOLWP: | |
182 | return "no LWP to satisfy query"; | |
183 | case TD_BADPH: | |
184 | return "invalid process handle"; | |
185 | case TD_BADTH: | |
186 | return "invalid thread handle"; | |
187 | case TD_BADSH: | |
188 | return "invalid synchronization handle"; | |
189 | case TD_BADTA: | |
190 | return "invalid thread agent"; | |
191 | case TD_BADKEY: | |
192 | return "invalid key"; | |
193 | case TD_NOMSG: | |
194 | return "no event message for getmsg"; | |
195 | case TD_NOFPREGS: | |
196 | return "FPU register set not available"; | |
197 | case TD_NOLIBTHREAD: | |
198 | return "application not linked with libthread"; | |
199 | case TD_NOEVENT: | |
200 | return "requested event is not supported"; | |
201 | case TD_NOCAPAB: | |
202 | return "capability not available"; | |
203 | case TD_DBERR: | |
204 | return "debugger service failed"; | |
205 | case TD_NOAPLIC: | |
206 | return "operation not applicable to"; | |
207 | case TD_NOTSD: | |
208 | return "no thread-specific data for this thread"; | |
209 | case TD_MALLOC: | |
210 | return "malloc failed"; | |
211 | case TD_PARTIALREG: | |
212 | return "only part of register set was written/read"; | |
213 | case TD_NOXREGS: | |
214 | return "X register set not available for this thread"; | |
215 | default: | |
216 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
217 | return buf; | |
218 | } | |
219 | } | |
220 | ||
221 | static char * | |
222 | thread_db_state_str (td_thr_state_e state) | |
223 | { | |
224 | static char buf[64]; | |
225 | ||
226 | switch (state) | |
227 | { | |
228 | case TD_THR_STOPPED: | |
229 | return "stopped by debugger"; | |
230 | case TD_THR_RUN: | |
231 | return "runnable"; | |
232 | case TD_THR_ACTIVE: | |
233 | return "active"; | |
234 | case TD_THR_ZOMBIE: | |
235 | return "zombie"; | |
236 | case TD_THR_SLEEP: | |
237 | return "sleeping"; | |
238 | case TD_THR_STOPPED_ASLEEP: | |
239 | return "stopped by debugger AND blocked"; | |
240 | default: | |
241 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
242 | return buf; | |
243 | } | |
244 | } | |
245 | \f | |
5365276c | 246 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 247 | threads to LWPs. |
5365276c DJ |
248 | |
249 | THP is a handle to the current thread; if INFOP is not NULL, the | |
250 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
251 | *INFOP. |
252 | ||
253 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
254 | zero is returned to indicate success. */ | |
5365276c DJ |
255 | |
256 | static int | |
257 | thread_get_info_callback (const td_thrhandle_t *thp, void *infop) | |
258 | { | |
259 | td_thrinfo_t ti; | |
260 | td_err_e err; | |
261 | struct thread_info *thread_info; | |
262 | ptid_t thread_ptid; | |
263 | ||
264 | err = td_thr_get_info_p (thp, &ti); | |
265 | if (err != TD_OK) | |
b4acd559 | 266 | error ("thread_get_info_callback: cannot get thread info: %s", |
5365276c DJ |
267 | thread_db_err_str (err)); |
268 | ||
269 | /* Fill the cache. */ | |
270 | thread_ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); | |
271 | thread_info = find_thread_pid (thread_ptid); | |
272 | ||
b9b5d7ea | 273 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 274 | attach to it thinking it is a new thread. */ |
b9b5d7ea JJ |
275 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
276 | { | |
277 | if (infop != NULL) | |
278 | *(struct thread_info **) infop = thread_info; | |
f90ef764 JJ |
279 | if (thread_info != NULL) |
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 | } | |
b9b5d7ea JJ |
286 | return TD_THR_ZOMBIE; |
287 | } | |
288 | ||
5365276c DJ |
289 | if (thread_info == NULL) |
290 | { | |
291 | /* New thread. Attach to it now (why wait?). */ | |
292 | attach_thread (thread_ptid, thp, &ti, 1); | |
293 | thread_info = find_thread_pid (thread_ptid); | |
294 | gdb_assert (thread_info != NULL); | |
295 | } | |
296 | ||
297 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
298 | thread_info->private->th_valid = 1; | |
299 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
300 | thread_info->private->ti_valid = 1; | |
301 | ||
302 | if (infop != NULL) | |
303 | *(struct thread_info **) infop = thread_info; | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /* Accessor functions for the thread_db information, with caching. */ | |
fb0e1ba7 | 309 | |
5365276c DJ |
310 | static void |
311 | thread_db_map_id2thr (struct thread_info *thread_info, int fatal) | |
312 | { | |
313 | td_err_e err; | |
314 | ||
315 | if (thread_info->private->th_valid) | |
316 | return; | |
317 | ||
318 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid), | |
319 | &thread_info->private->th); | |
320 | if (err != TD_OK) | |
321 | { | |
322 | if (fatal) | |
323 | error ("Cannot find thread %ld: %s", | |
b4acd559 JJ |
324 | (long) GET_THREAD (thread_info->ptid), |
325 | thread_db_err_str (err)); | |
5365276c DJ |
326 | } |
327 | else | |
328 | thread_info->private->th_valid = 1; | |
329 | } | |
330 | ||
331 | static td_thrinfo_t * | |
332 | thread_db_get_info (struct thread_info *thread_info) | |
333 | { | |
334 | td_err_e err; | |
335 | ||
336 | if (thread_info->private->ti_valid) | |
337 | return &thread_info->private->ti; | |
338 | ||
b4acd559 | 339 | if (!thread_info->private->th_valid) |
5365276c DJ |
340 | thread_db_map_id2thr (thread_info, 1); |
341 | ||
b4acd559 JJ |
342 | err = |
343 | td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti); | |
5365276c | 344 | if (err != TD_OK) |
b4acd559 | 345 | error ("thread_db_get_info: cannot get thread info: %s", |
5365276c DJ |
346 | thread_db_err_str (err)); |
347 | ||
348 | thread_info->private->ti_valid = 1; | |
349 | return &thread_info->private->ti; | |
350 | } | |
351 | \f | |
fb0e1ba7 MK |
352 | /* Convert between user-level thread ids and LWP ids. */ |
353 | ||
39f77062 KB |
354 | static ptid_t |
355 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 356 | { |
fb0e1ba7 MK |
357 | td_thrhandle_t th; |
358 | td_err_e err; | |
5365276c DJ |
359 | struct thread_info *thread_info; |
360 | ptid_t thread_ptid; | |
fb0e1ba7 | 361 | |
39f77062 KB |
362 | if (GET_LWP (ptid) == 0) |
363 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); | |
fb0e1ba7 | 364 | |
39f77062 | 365 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 366 | |
39f77062 | 367 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
fb0e1ba7 | 368 | if (err != TD_OK) |
823ca731 | 369 | error ("Cannot find user-level thread for LWP %ld: %s", |
39f77062 | 370 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 371 | |
5365276c | 372 | thread_info = NULL; |
b9b5d7ea JJ |
373 | |
374 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the | |
375 | event thread has already died. If another gdb interface has called | |
376 | thread_alive() previously, the thread won't be found on the thread list | |
377 | anymore. In that case, we don't want to process this ptid anymore | |
378 | to avoid the possibility of later treating it as a newly | |
379 | discovered thread id that we should add to the list. Thus, | |
380 | we return a -1 ptid which is also how the thread list marks a | |
381 | dead thread. */ | |
382 | if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE | |
383 | && thread_info == NULL) | |
384 | return pid_to_ptid (-1); | |
385 | ||
5365276c | 386 | gdb_assert (thread_info && thread_info->private->ti_valid); |
fb0e1ba7 | 387 | |
5365276c | 388 | return BUILD_THREAD (thread_info->private->ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 MK |
389 | } |
390 | ||
39f77062 KB |
391 | static ptid_t |
392 | lwp_from_thread (ptid_t ptid) | |
fb0e1ba7 | 393 | { |
5365276c DJ |
394 | struct thread_info *thread_info; |
395 | ptid_t thread_ptid; | |
fb0e1ba7 | 396 | |
21bf60fe | 397 | if (!is_thread (ptid)) |
39f77062 | 398 | return ptid; |
fb0e1ba7 | 399 | |
5365276c DJ |
400 | thread_info = find_thread_pid (ptid); |
401 | thread_db_get_info (thread_info); | |
fb0e1ba7 | 402 | |
5365276c | 403 | return BUILD_LWP (thread_info->private->ti.ti_lid, GET_PID (ptid)); |
fb0e1ba7 MK |
404 | } |
405 | \f | |
406 | ||
407 | void | |
408 | thread_db_init (struct target_ops *target) | |
409 | { | |
410 | target_beneath = target; | |
411 | } | |
412 | ||
5220ea4c AC |
413 | static void * |
414 | verbose_dlsym (void *handle, const char *name) | |
415 | { | |
416 | void *sym = dlsym (handle, name); | |
417 | if (sym == NULL) | |
418 | warning ("Symbol \"%s\" not found in libthread_db: %s", name, dlerror ()); | |
419 | return sym; | |
420 | } | |
421 | ||
fb0e1ba7 MK |
422 | static int |
423 | thread_db_load (void) | |
424 | { | |
425 | void *handle; | |
426 | td_err_e err; | |
427 | ||
428 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
429 | if (handle == NULL) | |
f7c1e0f3 | 430 | { |
b4acd559 | 431 | fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
f7c1e0f3 | 432 | LIBTHREAD_DB_SO, dlerror ()); |
b4acd559 | 433 | fprintf_filtered (gdb_stderr, |
f7c1e0f3 MS |
434 | "GDB will not be able to debug pthreads.\n\n"); |
435 | return 0; | |
436 | } | |
fb0e1ba7 MK |
437 | |
438 | /* Initialize pointers to the dynamic library functions we will use. | |
439 | Essential functions first. */ | |
440 | ||
5220ea4c | 441 | td_init_p = verbose_dlsym (handle, "td_init"); |
fb0e1ba7 MK |
442 | if (td_init_p == NULL) |
443 | return 0; | |
444 | ||
5220ea4c | 445 | td_ta_new_p = verbose_dlsym (handle, "td_ta_new"); |
fb0e1ba7 MK |
446 | if (td_ta_new_p == NULL) |
447 | return 0; | |
448 | ||
5220ea4c | 449 | td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr"); |
fb0e1ba7 MK |
450 | if (td_ta_map_id2thr_p == NULL) |
451 | return 0; | |
452 | ||
5220ea4c | 453 | td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr"); |
fb0e1ba7 MK |
454 | if (td_ta_map_lwp2thr_p == NULL) |
455 | return 0; | |
456 | ||
5220ea4c | 457 | td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter"); |
fb0e1ba7 MK |
458 | if (td_ta_thr_iter_p == NULL) |
459 | return 0; | |
460 | ||
5220ea4c | 461 | td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate"); |
fb0e1ba7 MK |
462 | if (td_thr_validate_p == NULL) |
463 | return 0; | |
464 | ||
5220ea4c | 465 | td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info"); |
fb0e1ba7 MK |
466 | if (td_thr_get_info_p == NULL) |
467 | return 0; | |
468 | ||
5220ea4c | 469 | td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs"); |
fb0e1ba7 MK |
470 | if (td_thr_getfpregs_p == NULL) |
471 | return 0; | |
472 | ||
5220ea4c | 473 | td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs"); |
fb0e1ba7 MK |
474 | if (td_thr_getgregs_p == NULL) |
475 | return 0; | |
476 | ||
5220ea4c | 477 | td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs"); |
fb0e1ba7 MK |
478 | if (td_thr_setfpregs_p == NULL) |
479 | return 0; | |
480 | ||
5220ea4c | 481 | td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs"); |
fb0e1ba7 MK |
482 | if (td_thr_setgregs_p == NULL) |
483 | return 0; | |
484 | ||
485 | /* Initialize the library. */ | |
486 | err = td_init_p (); | |
487 | if (err != TD_OK) | |
488 | { | |
489 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
490 | return 0; | |
491 | } | |
492 | ||
493 | /* These are not essential. */ | |
494 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
495 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
496 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
497 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
3f47be5c | 498 | td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
fb0e1ba7 MK |
499 | |
500 | return 1; | |
501 | } | |
502 | ||
cdbc0b18 | 503 | static td_err_e |
24557e30 AC |
504 | enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp) |
505 | { | |
506 | td_notify_t notify; | |
cdbc0b18 | 507 | td_err_e err; |
24557e30 AC |
508 | |
509 | /* Get the breakpoint address for thread EVENT. */ | |
510 | err = td_ta_event_addr_p (thread_agent, event, ¬ify); | |
511 | if (err != TD_OK) | |
cdbc0b18 | 512 | return err; |
24557e30 AC |
513 | |
514 | /* Set up the breakpoint. */ | |
515 | (*bp) = gdbarch_convert_from_func_ptr_addr (current_gdbarch, | |
516 | (CORE_ADDR) notify.u.bptaddr, | |
517 | ¤t_target); | |
518 | create_thread_event_breakpoint ((*bp)); | |
519 | ||
cdbc0b18 | 520 | return TD_OK; |
24557e30 AC |
521 | } |
522 | ||
fb0e1ba7 MK |
523 | static void |
524 | enable_thread_event_reporting (void) | |
525 | { | |
526 | td_thr_events_t events; | |
527 | td_notify_t notify; | |
528 | td_err_e err; | |
a2f23071 DJ |
529 | #ifdef HAVE_GNU_LIBC_VERSION_H |
530 | const char *libc_version; | |
531 | int libc_major, libc_minor; | |
532 | #endif | |
fb0e1ba7 MK |
533 | |
534 | /* We cannot use the thread event reporting facility if these | |
535 | functions aren't available. */ | |
536 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
537 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
538 | return; | |
539 | ||
540 | /* Set the process wide mask saying which events we're interested in. */ | |
541 | td_event_emptyset (&events); | |
542 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
543 | |
544 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
fb0e1ba7 MK |
545 | /* FIXME: kettenis/2000-04-23: The event reporting facility is |
546 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
547 | now. */ | |
a2f23071 DJ |
548 | libc_version = gnu_get_libc_version (); |
549 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
550 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 551 | #endif |
a2f23071 | 552 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 MK |
553 | |
554 | err = td_ta_set_event_p (thread_agent, &events); | |
555 | if (err != TD_OK) | |
556 | { | |
557 | warning ("Unable to set global thread event mask: %s", | |
558 | thread_db_err_str (err)); | |
559 | return; | |
560 | } | |
561 | ||
562 | /* Delete previous thread event breakpoints, if any. */ | |
563 | remove_thread_event_breakpoints (); | |
24557e30 AC |
564 | td_create_bp_addr = 0; |
565 | td_death_bp_addr = 0; | |
fb0e1ba7 | 566 | |
24557e30 | 567 | /* Set up the thread creation event. */ |
cdbc0b18 RM |
568 | err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr); |
569 | if (err != TD_OK) | |
fb0e1ba7 MK |
570 | { |
571 | warning ("Unable to get location for thread creation breakpoint: %s", | |
572 | thread_db_err_str (err)); | |
573 | return; | |
574 | } | |
575 | ||
24557e30 | 576 | /* Set up the thread death event. */ |
cdbc0b18 RM |
577 | err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr); |
578 | if (err != TD_OK) | |
fb0e1ba7 | 579 | { |
936742ab | 580 | warning ("Unable to get location for thread death breakpoint: %s", |
fb0e1ba7 MK |
581 | thread_db_err_str (err)); |
582 | return; | |
583 | } | |
fb0e1ba7 MK |
584 | } |
585 | ||
586 | static void | |
587 | disable_thread_event_reporting (void) | |
588 | { | |
589 | td_thr_events_t events; | |
590 | ||
591 | /* Set the process wide mask saying we aren't interested in any | |
592 | events anymore. */ | |
593 | td_event_emptyset (&events); | |
594 | td_ta_set_event_p (thread_agent, &events); | |
595 | ||
596 | /* Delete thread event breakpoints, if any. */ | |
597 | remove_thread_event_breakpoints (); | |
598 | td_create_bp_addr = 0; | |
599 | td_death_bp_addr = 0; | |
600 | } | |
601 | ||
602 | static void | |
603 | check_thread_signals (void) | |
604 | { | |
605 | #ifdef GET_THREAD_SIGNALS | |
21bf60fe | 606 | if (!thread_signals) |
fb0e1ba7 MK |
607 | { |
608 | sigset_t mask; | |
609 | int i; | |
610 | ||
611 | GET_THREAD_SIGNALS (&mask); | |
612 | sigemptyset (&thread_stop_set); | |
613 | sigemptyset (&thread_print_set); | |
614 | ||
b9569773 | 615 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
616 | { |
617 | if (sigismember (&mask, i)) | |
618 | { | |
619 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
620 | sigaddset (&thread_stop_set, i); | |
621 | if (signal_print_update (target_signal_from_host (i), 0)) | |
622 | sigaddset (&thread_print_set, i); | |
623 | thread_signals = 1; | |
624 | } | |
625 | } | |
626 | } | |
627 | #endif | |
628 | } | |
629 | ||
fb0e1ba7 MK |
630 | static void |
631 | thread_db_new_objfile (struct objfile *objfile) | |
632 | { | |
633 | td_err_e err; | |
634 | ||
5220ea4c AC |
635 | /* First time through, report that libthread_db was successfuly |
636 | loaded. Can't print this in in thread_db_load as, at that stage, | |
637 | the interpreter and it's console haven't started. The real | |
638 | problem here is that libthread_db is loaded too early - it should | |
639 | only be loaded when there is a program to debug. */ | |
640 | { | |
641 | static int dejavu; | |
642 | if (!dejavu) | |
643 | { | |
644 | Dl_info info; | |
645 | const char *library = NULL; | |
646 | /* Try dladdr. */ | |
647 | if (dladdr ((*td_ta_new_p), &info) != 0) | |
648 | library = info.dli_fname; | |
649 | /* Try dlinfo? */ | |
650 | if (library == NULL) | |
651 | /* Paranoid - don't let a NULL path slip through. */ | |
652 | library = LIBTHREAD_DB_SO; | |
653 | printf_unfiltered ("Using host libthread_db library \"%s\".\n", | |
654 | library); | |
655 | dejavu = 1; | |
656 | } | |
657 | } | |
658 | ||
5bbd998e MS |
659 | /* Don't attempt to use thread_db on targets which can not run |
660 | (core files). */ | |
661 | if (objfile == NULL || !target_has_execution) | |
bda9cb72 MK |
662 | { |
663 | /* All symbols have been discarded. If the thread_db target is | |
c194fbe1 | 664 | active, deactivate it now. */ |
bda9cb72 | 665 | if (using_thread_db) |
c194fbe1 MK |
666 | { |
667 | gdb_assert (proc_handle.pid == 0); | |
668 | unpush_target (&thread_db_ops); | |
669 | using_thread_db = 0; | |
670 | } | |
671 | ||
bda9cb72 MK |
672 | goto quit; |
673 | } | |
674 | ||
fb0e1ba7 MK |
675 | if (using_thread_db) |
676 | /* Nothing to do. The thread library was already detected and the | |
677 | target vector was already activated. */ | |
678 | goto quit; | |
679 | ||
bda9cb72 MK |
680 | /* Initialize the structure that identifies the child process. Note |
681 | that at this point there is no guarantee that we actually have a | |
682 | child process. */ | |
39f77062 | 683 | proc_handle.pid = GET_PID (inferior_ptid); |
fb0e1ba7 | 684 | |
bda9cb72 | 685 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
686 | err = td_ta_new_p (&proc_handle, &thread_agent); |
687 | switch (err) | |
688 | { | |
689 | case TD_NOLIBTHREAD: | |
bda9cb72 | 690 | /* No thread library was detected. */ |
fb0e1ba7 MK |
691 | break; |
692 | ||
693 | case TD_OK: | |
5220ea4c AC |
694 | printf_unfiltered ("[Thread debugging using libthread_db enabled]\n"); |
695 | ||
bda9cb72 MK |
696 | /* The thread library was detected. Activate the thread_db target. */ |
697 | push_target (&thread_db_ops); | |
698 | using_thread_db = 1; | |
699 | ||
95575b2e AC |
700 | enable_thread_event_reporting (); |
701 | thread_db_find_new_threads (); | |
fb0e1ba7 MK |
702 | break; |
703 | ||
704 | default: | |
705 | warning ("Cannot initialize thread debugging library: %s", | |
706 | thread_db_err_str (err)); | |
707 | break; | |
708 | } | |
709 | ||
b4acd559 | 710 | quit: |
540af400 MS |
711 | if (target_new_objfile_chain) |
712 | target_new_objfile_chain (objfile); | |
fb0e1ba7 MK |
713 | } |
714 | ||
a2f23071 DJ |
715 | /* Attach to a new thread. This function is called when we receive a |
716 | TD_CREATE event or when we iterate over all threads and find one | |
717 | that wasn't already in our list. */ | |
718 | ||
fb0e1ba7 | 719 | static void |
39f77062 | 720 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
fb0e1ba7 MK |
721 | const td_thrinfo_t *ti_p, int verbose) |
722 | { | |
723 | struct thread_info *tp; | |
724 | td_err_e err; | |
725 | ||
a2f23071 DJ |
726 | /* If we're being called after a TD_CREATE event, we may already |
727 | know about this thread. There are two ways this can happen. We | |
728 | may have iterated over all threads between the thread creation | |
729 | and the TD_CREATE event, for instance when the user has issued | |
730 | the `info threads' command before the SIGTRAP for hitting the | |
731 | thread creation breakpoint was reported. Alternatively, the | |
732 | thread may have exited and a new one been created with the same | |
733 | thread ID. In the first case we don't need to do anything; in | |
734 | the second case we should discard information about the dead | |
735 | thread and attach to the new one. */ | |
736 | if (in_thread_list (ptid)) | |
737 | { | |
738 | tp = find_thread_pid (ptid); | |
739 | gdb_assert (tp != NULL); | |
740 | ||
741 | if (!tp->private->dying) | |
742 | return; | |
743 | ||
744 | delete_thread (ptid); | |
745 | } | |
746 | ||
fb0e1ba7 MK |
747 | check_thread_signals (); |
748 | ||
fb0e1ba7 | 749 | /* Add the thread to GDB's thread list. */ |
39f77062 | 750 | tp = add_thread (ptid); |
fb0e1ba7 | 751 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
5365276c DJ |
752 | memset (tp->private, 0, sizeof (struct private_thread_info)); |
753 | ||
754 | if (verbose) | |
755 | printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid)); | |
fb0e1ba7 | 756 | |
21bf60fe MK |
757 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
758 | return; /* A zombie thread -- do not attach. */ | |
5fd913cc | 759 | |
8605d56e | 760 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
fb0e1ba7 | 761 | #ifdef ATTACH_LWP |
c194fbe1 | 762 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); |
fb0e1ba7 MK |
763 | #endif |
764 | ||
765 | /* Enable thread event reporting for this thread. */ | |
766 | err = td_thr_event_enable_p (th_p, 1); | |
767 | if (err != TD_OK) | |
768 | error ("Cannot enable thread event reporting for %s: %s", | |
39f77062 | 769 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
770 | } |
771 | ||
c194fbe1 MK |
772 | static void |
773 | thread_db_attach (char *args, int from_tty) | |
774 | { | |
775 | target_beneath->to_attach (args, from_tty); | |
776 | ||
777 | /* Destroy thread info; it's no longer valid. */ | |
778 | init_thread_list (); | |
779 | ||
780 | /* The child process is now the actual multi-threaded | |
781 | program. Snatch its process ID... */ | |
782 | proc_handle.pid = GET_PID (inferior_ptid); | |
783 | ||
784 | /* ...and perform the remaining initialization steps. */ | |
785 | enable_thread_event_reporting (); | |
b4acd559 | 786 | thread_db_find_new_threads (); |
c194fbe1 MK |
787 | } |
788 | ||
fb0e1ba7 | 789 | static void |
39f77062 | 790 | detach_thread (ptid_t ptid, int verbose) |
fb0e1ba7 | 791 | { |
a2f23071 DJ |
792 | struct thread_info *thread_info; |
793 | ||
fb0e1ba7 | 794 | if (verbose) |
39f77062 | 795 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); |
a2f23071 DJ |
796 | |
797 | /* Don't delete the thread now, because it still reports as active | |
798 | until it has executed a few instructions after the event | |
799 | breakpoint - if we deleted it now, "info threads" would cause us | |
800 | to re-attach to it. Just mark it as having had a TD_DEATH | |
801 | event. This means that we won't delete it from our thread list | |
802 | until we notice that it's dead (via prune_threads), or until | |
803 | something re-uses its thread ID. */ | |
804 | thread_info = find_thread_pid (ptid); | |
805 | gdb_assert (thread_info != NULL); | |
806 | thread_info->private->dying = 1; | |
fb0e1ba7 MK |
807 | } |
808 | ||
809 | static void | |
810 | thread_db_detach (char *args, int from_tty) | |
811 | { | |
812 | disable_thread_event_reporting (); | |
c194fbe1 MK |
813 | |
814 | /* There's no need to save & restore inferior_ptid here, since the | |
815 | inferior is supposed to be survive this function call. */ | |
816 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
817 | ||
818 | /* Forget about the child's process ID. We shouldn't need it | |
819 | anymore. */ | |
820 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
821 | |
822 | target_beneath->to_detach (args, from_tty); | |
823 | } | |
824 | ||
5365276c DJ |
825 | static int |
826 | clear_lwpid_callback (struct thread_info *thread, void *dummy) | |
827 | { | |
828 | /* If we know that our thread implementation is 1-to-1, we could save | |
829 | a certain amount of information; it's not clear how much, so we | |
830 | are always conservative. */ | |
831 | ||
832 | thread->private->th_valid = 0; | |
833 | thread->private->ti_valid = 0; | |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
fb0e1ba7 | 838 | static void |
39f77062 | 839 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 | 840 | { |
39f77062 | 841 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 842 | |
39f77062 KB |
843 | if (GET_PID (ptid) == -1) |
844 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
845 | else if (is_thread (ptid)) | |
846 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 847 | |
5365276c DJ |
848 | /* Clear cached data which may not be valid after the resume. */ |
849 | iterate_over_threads (clear_lwpid_callback, NULL); | |
850 | ||
39f77062 | 851 | target_beneath->to_resume (ptid, step, signo); |
fb0e1ba7 MK |
852 | |
853 | do_cleanups (old_chain); | |
854 | } | |
855 | ||
856 | /* Check if PID is currently stopped at the location of a thread event | |
857 | breakpoint location. If it is, read the event message and act upon | |
858 | the event. */ | |
859 | ||
860 | static void | |
39f77062 | 861 | check_event (ptid_t ptid) |
fb0e1ba7 MK |
862 | { |
863 | td_event_msg_t msg; | |
864 | td_thrinfo_t ti; | |
865 | td_err_e err; | |
866 | CORE_ADDR stop_pc; | |
4d9850d3 | 867 | int loop = 0; |
fb0e1ba7 MK |
868 | |
869 | /* Bail out early if we're not at a thread event breakpoint. */ | |
39f77062 | 870 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
fb0e1ba7 MK |
871 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
872 | return; | |
873 | ||
4d9850d3 JJ |
874 | /* If we are at a create breakpoint, we do not know what new lwp |
875 | was created and cannot specifically locate the event message for it. | |
876 | We have to call td_ta_event_getmsg() to get | |
877 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 878 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 879 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
880 | This guarantees we will process the correct message before continuing |
881 | from the breakpoint. | |
4d9850d3 JJ |
882 | |
883 | Currently, death events are not enabled. If they are enabled, | |
884 | the death event can use the td_thr_event_getmsg() interface to | |
885 | get the message specifically for that lwp and avoid looping | |
886 | below. */ | |
887 | ||
888 | loop = 1; | |
889 | ||
890 | do | |
fb0e1ba7 | 891 | { |
4d9850d3 JJ |
892 | err = td_ta_event_getmsg_p (thread_agent, &msg); |
893 | if (err != TD_OK) | |
894 | { | |
895 | if (err == TD_NOMSG) | |
896 | return; | |
fb0e1ba7 | 897 | |
4d9850d3 JJ |
898 | error ("Cannot get thread event message: %s", |
899 | thread_db_err_str (err)); | |
900 | } | |
fb0e1ba7 | 901 | |
4d9850d3 JJ |
902 | err = td_thr_get_info_p (msg.th_p, &ti); |
903 | if (err != TD_OK) | |
904 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
fb0e1ba7 | 905 | |
4d9850d3 | 906 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 | 907 | |
4d9850d3 JJ |
908 | switch (msg.event) |
909 | { | |
910 | case TD_CREATE: | |
a2f23071 DJ |
911 | /* Call attach_thread whether or not we already know about a |
912 | thread with this thread ID. */ | |
913 | attach_thread (ptid, msg.th_p, &ti, 1); | |
fb0e1ba7 | 914 | |
4d9850d3 | 915 | break; |
fb0e1ba7 | 916 | |
4d9850d3 | 917 | case TD_DEATH: |
fb0e1ba7 | 918 | |
4d9850d3 JJ |
919 | if (!in_thread_list (ptid)) |
920 | error ("Spurious thread death event."); | |
fb0e1ba7 | 921 | |
4d9850d3 | 922 | detach_thread (ptid, 1); |
fb0e1ba7 | 923 | |
4d9850d3 | 924 | break; |
fb0e1ba7 | 925 | |
4d9850d3 JJ |
926 | default: |
927 | error ("Spurious thread event."); | |
928 | } | |
fb0e1ba7 | 929 | } |
4d9850d3 | 930 | while (loop); |
fb0e1ba7 MK |
931 | } |
932 | ||
39f77062 KB |
933 | static ptid_t |
934 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 | 935 | { |
39f77062 | 936 | extern ptid_t trap_ptid; |
fb0e1ba7 | 937 | |
39f77062 KB |
938 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
939 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 940 | |
39f77062 | 941 | ptid = target_beneath->to_wait (ptid, ourstatus); |
fb0e1ba7 | 942 | |
bda9cb72 MK |
943 | if (proc_handle.pid == 0) |
944 | /* The current child process isn't the actual multi-threaded | |
945 | program yet, so don't try to do any special thread-specific | |
946 | post-processing and bail out early. */ | |
39f77062 | 947 | return ptid; |
bda9cb72 | 948 | |
fb0e1ba7 | 949 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
39f77062 | 950 | return pid_to_ptid (-1); |
fb0e1ba7 MK |
951 | |
952 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
953 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
954 | /* Check for a thread event. */ | |
39f77062 | 955 | check_event (ptid); |
fb0e1ba7 | 956 | |
39f77062 KB |
957 | if (!ptid_equal (trap_ptid, null_ptid)) |
958 | trap_ptid = thread_from_lwp (trap_ptid); | |
fb0e1ba7 | 959 | |
b9b5d7ea JJ |
960 | /* Change the ptid back into the higher level PID + TID format. |
961 | If the thread is dead and no longer on the thread list, we will | |
962 | get back a dead ptid. This can occur if the thread death event | |
963 | gets postponed by other simultaneous events. In such a case, | |
964 | we want to just ignore the event and continue on. */ | |
965 | ptid = thread_from_lwp (ptid); | |
966 | if (GET_PID (ptid) == -1) | |
967 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
968 | ||
969 | return ptid; | |
fb0e1ba7 MK |
970 | } |
971 | ||
972 | static int | |
973 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
b4acd559 | 974 | struct mem_attrib *attrib, struct target_ops *target) |
fb0e1ba7 | 975 | { |
39f77062 | 976 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 MK |
977 | int xfer; |
978 | ||
39f77062 | 979 | if (is_thread (inferior_ptid)) |
fb0e1ba7 MK |
980 | { |
981 | /* FIXME: This seems to be necessary to make sure breakpoints | |
982 | are removed. */ | |
21bf60fe | 983 | if (!target_thread_alive (inferior_ptid)) |
39f77062 | 984 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); |
fb0e1ba7 | 985 | else |
39f77062 | 986 | inferior_ptid = lwp_from_thread (inferior_ptid); |
fb0e1ba7 MK |
987 | } |
988 | ||
b4acd559 JJ |
989 | xfer = |
990 | target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, | |
991 | target); | |
fb0e1ba7 MK |
992 | |
993 | do_cleanups (old_chain); | |
994 | return xfer; | |
995 | } | |
996 | ||
997 | static void | |
998 | thread_db_fetch_registers (int regno) | |
999 | { | |
5365276c | 1000 | struct thread_info *thread_info; |
fb0e1ba7 MK |
1001 | prgregset_t gregset; |
1002 | gdb_prfpregset_t fpregset; | |
1003 | td_err_e err; | |
1004 | ||
21bf60fe | 1005 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
1006 | { |
1007 | /* Pass the request to the target beneath us. */ | |
1008 | target_beneath->to_fetch_registers (regno); | |
1009 | return; | |
1010 | } | |
1011 | ||
5365276c DJ |
1012 | thread_info = find_thread_pid (inferior_ptid); |
1013 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 | 1014 | |
5365276c | 1015 | err = td_thr_getgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 MK |
1016 | if (err != TD_OK) |
1017 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
39f77062 | 1018 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 | 1019 | |
5365276c | 1020 | err = td_thr_getfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 MK |
1021 | if (err != TD_OK) |
1022 | error ("Cannot get floating-point registers for thread %ld: %s", | |
39f77062 | 1023 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1024 | |
1025 | /* Note that we must call supply_gregset after calling the thread_db | |
1026 | routines because the thread_db routines call ps_lgetgregs and | |
1027 | friends which clobber GDB's register cache. */ | |
1028 | supply_gregset ((gdb_gregset_t *) gregset); | |
1029 | supply_fpregset (&fpregset); | |
1030 | } | |
1031 | ||
1032 | static void | |
1033 | thread_db_store_registers (int regno) | |
1034 | { | |
fb0e1ba7 MK |
1035 | prgregset_t gregset; |
1036 | gdb_prfpregset_t fpregset; | |
1037 | td_err_e err; | |
5365276c | 1038 | struct thread_info *thread_info; |
fb0e1ba7 | 1039 | |
21bf60fe | 1040 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
1041 | { |
1042 | /* Pass the request to the target beneath us. */ | |
1043 | target_beneath->to_store_registers (regno); | |
1044 | return; | |
1045 | } | |
1046 | ||
5365276c DJ |
1047 | thread_info = find_thread_pid (inferior_ptid); |
1048 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 MK |
1049 | |
1050 | if (regno != -1) | |
1051 | { | |
123a958e | 1052 | char raw[MAX_REGISTER_SIZE]; |
fb0e1ba7 | 1053 | |
4caf0990 | 1054 | deprecated_read_register_gen (regno, raw); |
fb0e1ba7 | 1055 | thread_db_fetch_registers (-1); |
23a6d369 | 1056 | regcache_raw_supply (current_regcache, regno, raw); |
fb0e1ba7 MK |
1057 | } |
1058 | ||
1059 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
1060 | fill_fpregset (&fpregset, -1); | |
1061 | ||
5365276c | 1062 | err = td_thr_setgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 MK |
1063 | if (err != TD_OK) |
1064 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
39f77062 | 1065 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
5365276c | 1066 | err = td_thr_setfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 MK |
1067 | if (err != TD_OK) |
1068 | error ("Cannot store floating-point registers for thread %ld: %s", | |
39f77062 | 1069 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1070 | } |
1071 | ||
1072 | static void | |
1073 | thread_db_kill (void) | |
1074 | { | |
c194fbe1 MK |
1075 | /* There's no need to save & restore inferior_ptid here, since the |
1076 | inferior isn't supposed to survive this function call. */ | |
1077 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
fb0e1ba7 MK |
1078 | target_beneath->to_kill (); |
1079 | } | |
1080 | ||
1081 | static void | |
c27cda74 AC |
1082 | thread_db_create_inferior (char *exec_file, char *allargs, char **env, |
1083 | int from_tty) | |
fb0e1ba7 | 1084 | { |
b26a6851 AC |
1085 | unpush_target (&thread_db_ops); |
1086 | using_thread_db = 0; | |
c27cda74 | 1087 | target_beneath->to_create_inferior (exec_file, allargs, env, from_tty); |
bda9cb72 | 1088 | } |
fb0e1ba7 | 1089 | |
bda9cb72 | 1090 | static void |
39f77062 | 1091 | thread_db_post_startup_inferior (ptid_t ptid) |
bda9cb72 MK |
1092 | { |
1093 | if (proc_handle.pid == 0) | |
1094 | { | |
1095 | /* The child process is now the actual multi-threaded | |
1096 | program. Snatch its process ID... */ | |
39f77062 | 1097 | proc_handle.pid = GET_PID (ptid); |
fb0e1ba7 | 1098 | |
bda9cb72 MK |
1099 | /* ...and perform the remaining initialization steps. */ |
1100 | enable_thread_event_reporting (); | |
21bf60fe | 1101 | thread_db_find_new_threads (); |
bda9cb72 | 1102 | } |
fb0e1ba7 MK |
1103 | } |
1104 | ||
1105 | static void | |
1106 | thread_db_mourn_inferior (void) | |
1107 | { | |
1108 | remove_thread_event_breakpoints (); | |
c194fbe1 MK |
1109 | |
1110 | /* Forget about the child's process ID. We shouldn't need it | |
1111 | anymore. */ | |
1112 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
1113 | |
1114 | target_beneath->to_mourn_inferior (); | |
043b2f77 | 1115 | |
b26a6851 AC |
1116 | /* Detach thread_db target ops. */ |
1117 | unpush_target (&thread_db_ops); | |
1118 | using_thread_db = 0; | |
fb0e1ba7 MK |
1119 | } |
1120 | ||
1121 | static int | |
39f77062 | 1122 | thread_db_thread_alive (ptid_t ptid) |
fb0e1ba7 | 1123 | { |
5fd913cc | 1124 | td_thrhandle_t th; |
21bf60fe | 1125 | td_err_e err; |
5fd913cc | 1126 | |
39f77062 | 1127 | if (is_thread (ptid)) |
fb0e1ba7 | 1128 | { |
5365276c DJ |
1129 | struct thread_info *thread_info; |
1130 | thread_info = find_thread_pid (ptid); | |
fb0e1ba7 | 1131 | |
5365276c | 1132 | thread_db_map_id2thr (thread_info, 0); |
b4acd559 | 1133 | if (!thread_info->private->th_valid) |
fb0e1ba7 MK |
1134 | return 0; |
1135 | ||
5365276c | 1136 | err = td_thr_validate_p (&thread_info->private->th); |
5fd913cc MS |
1137 | if (err != TD_OK) |
1138 | return 0; | |
1139 | ||
b4acd559 | 1140 | if (!thread_info->private->ti_valid) |
5365276c | 1141 | { |
b4acd559 JJ |
1142 | err = |
1143 | td_thr_get_info_p (&thread_info->private->th, | |
1144 | &thread_info->private->ti); | |
5365276c DJ |
1145 | if (err != TD_OK) |
1146 | return 0; | |
1147 | thread_info->private->ti_valid = 1; | |
1148 | } | |
1149 | ||
1150 | if (thread_info->private->ti.ti_state == TD_THR_UNKNOWN | |
1151 | || thread_info->private->ti.ti_state == TD_THR_ZOMBIE) | |
21bf60fe | 1152 | return 0; /* A zombie thread. */ |
5fd913cc | 1153 | |
fb0e1ba7 MK |
1154 | return 1; |
1155 | } | |
1156 | ||
1157 | if (target_beneath->to_thread_alive) | |
39f77062 | 1158 | return target_beneath->to_thread_alive (ptid); |
fb0e1ba7 MK |
1159 | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | static int | |
1164 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1165 | { | |
1166 | td_thrinfo_t ti; | |
1167 | td_err_e err; | |
39f77062 | 1168 | ptid_t ptid; |
fb0e1ba7 MK |
1169 | |
1170 | err = td_thr_get_info_p (th_p, &ti); | |
1171 | if (err != TD_OK) | |
b4acd559 | 1172 | error ("find_new_threads_callback: cannot get thread info: %s", |
3197744f | 1173 | thread_db_err_str (err)); |
fb0e1ba7 | 1174 | |
21bf60fe MK |
1175 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1176 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1177 | |
39f77062 | 1178 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); |
fb0e1ba7 | 1179 | |
21bf60fe | 1180 | if (!in_thread_list (ptid)) |
39f77062 | 1181 | attach_thread (ptid, th_p, &ti, 1); |
fb0e1ba7 MK |
1182 | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | static void | |
1187 | thread_db_find_new_threads (void) | |
1188 | { | |
1189 | td_err_e err; | |
1190 | ||
1191 | /* Iterate over all user-space threads to discover new threads. */ | |
1192 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
1193 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
1194 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
1195 | if (err != TD_OK) | |
1196 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
1197 | } | |
1198 | ||
1199 | static char * | |
39f77062 | 1200 | thread_db_pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1201 | { |
39f77062 | 1202 | if (is_thread (ptid)) |
fb0e1ba7 MK |
1203 | { |
1204 | static char buf[64]; | |
5365276c | 1205 | td_thrinfo_t *ti_p; |
fb0e1ba7 | 1206 | td_err_e err; |
5365276c | 1207 | struct thread_info *thread_info; |
fb0e1ba7 | 1208 | |
5365276c DJ |
1209 | thread_info = find_thread_pid (ptid); |
1210 | thread_db_map_id2thr (thread_info, 0); | |
b4acd559 | 1211 | if (!thread_info->private->th_valid) |
5365276c | 1212 | { |
b4acd559 JJ |
1213 | snprintf (buf, sizeof (buf), "Thread %ld (Missing)", |
1214 | GET_THREAD (ptid)); | |
5365276c DJ |
1215 | return buf; |
1216 | } | |
fb0e1ba7 | 1217 | |
5365276c | 1218 | ti_p = thread_db_get_info (thread_info); |
fb0e1ba7 | 1219 | |
5365276c | 1220 | if (ti_p->ti_state == TD_THR_ACTIVE && ti_p->ti_lid != 0) |
fb0e1ba7 MK |
1221 | { |
1222 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
5365276c | 1223 | (long) ti_p->ti_tid, ti_p->ti_lid); |
fb0e1ba7 MK |
1224 | } |
1225 | else | |
1226 | { | |
1227 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
b4acd559 JJ |
1228 | (long) ti_p->ti_tid, |
1229 | thread_db_state_str (ti_p->ti_state)); | |
fb0e1ba7 MK |
1230 | } |
1231 | ||
1232 | return buf; | |
1233 | } | |
1234 | ||
39f77062 KB |
1235 | if (target_beneath->to_pid_to_str (ptid)) |
1236 | return target_beneath->to_pid_to_str (ptid); | |
fb0e1ba7 | 1237 | |
39f77062 | 1238 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1239 | } |
1240 | ||
3f47be5c EZ |
1241 | /* Get the address of the thread local variable in OBJFILE which is |
1242 | stored at OFFSET within the thread local storage for thread PTID. */ | |
1243 | ||
1244 | static CORE_ADDR | |
1245 | thread_db_get_thread_local_address (ptid_t ptid, struct objfile *objfile, | |
b4acd559 | 1246 | CORE_ADDR offset) |
3f47be5c EZ |
1247 | { |
1248 | if (is_thread (ptid)) | |
1249 | { | |
1250 | int objfile_is_library = (objfile->flags & OBJF_SHARED); | |
1251 | td_err_e err; | |
3f47be5c EZ |
1252 | void *address; |
1253 | CORE_ADDR lm; | |
5365276c | 1254 | struct thread_info *thread_info; |
3f47be5c EZ |
1255 | |
1256 | /* glibc doesn't provide the needed interface. */ | |
b4acd559 JJ |
1257 | if (!td_thr_tls_get_addr_p) |
1258 | error ("Cannot find thread-local variables in this thread library."); | |
3f47be5c EZ |
1259 | |
1260 | /* Get the address of the link map for this objfile. */ | |
1261 | lm = svr4_fetch_objfile_link_map (objfile); | |
1262 | ||
1263 | /* Whoops, we couldn't find one. Bail out. */ | |
1264 | if (!lm) | |
b4acd559 JJ |
1265 | { |
1266 | if (objfile_is_library) | |
1267 | error ("Cannot find shared library `%s' link_map in dynamic" | |
3f47be5c EZ |
1268 | " linker's module list", objfile->name); |
1269 | else | |
b4acd559 | 1270 | error ("Cannot find executable file `%s' link_map in dynamic" |
3f47be5c EZ |
1271 | " linker's module list", objfile->name); |
1272 | } | |
1273 | ||
1274 | /* Get info about the thread. */ | |
5365276c DJ |
1275 | thread_info = find_thread_pid (ptid); |
1276 | thread_db_map_id2thr (thread_info, 1); | |
1277 | ||
3f47be5c | 1278 | /* Finally, get the address of the variable. */ |
5365276c DJ |
1279 | err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm, |
1280 | offset, &address); | |
3f47be5c EZ |
1281 | |
1282 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1283 | /* The memory hasn't been allocated, yet. */ | |
1284 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1285 | { |
1286 | /* Now, if libthread_db provided the initialization image's | |
1287 | address, we *could* try to build a non-lvalue value from | |
1288 | the initialization image. */ | |
1289 | if (objfile_is_library) | |
1290 | error ("The inferior has not yet allocated storage for" | |
1291 | " thread-local variables in\n" | |
1292 | "the shared library `%s'\n" | |
1293 | "for the thread %ld", | |
3f47be5c | 1294 | objfile->name, (long) GET_THREAD (ptid)); |
b4acd559 JJ |
1295 | else |
1296 | error ("The inferior has not yet allocated storage for" | |
1297 | " thread-local variables in\n" | |
1298 | "the executable `%s'\n" | |
1299 | "for the thread %ld", | |
3f47be5c EZ |
1300 | objfile->name, (long) GET_THREAD (ptid)); |
1301 | } | |
1302 | #endif | |
1303 | ||
1304 | /* Something else went wrong. */ | |
1305 | if (err != TD_OK) | |
1306 | { | |
1307 | if (objfile_is_library) | |
1308 | error ("Cannot find thread-local storage for thread %ld, " | |
1309 | "shared library %s:\n%s", | |
1310 | (long) GET_THREAD (ptid), | |
b4acd559 | 1311 | objfile->name, thread_db_err_str (err)); |
3f47be5c EZ |
1312 | else |
1313 | error ("Cannot find thread-local storage for thread %ld, " | |
1314 | "executable file %s:\n%s", | |
1315 | (long) GET_THREAD (ptid), | |
b4acd559 | 1316 | objfile->name, thread_db_err_str (err)); |
3f47be5c EZ |
1317 | } |
1318 | ||
1319 | /* Cast assuming host == target. Joy. */ | |
1320 | return (CORE_ADDR) address; | |
1321 | } | |
1322 | ||
1323 | if (target_beneath->to_get_thread_local_address) | |
b4acd559 JJ |
1324 | return target_beneath->to_get_thread_local_address (ptid, objfile, |
1325 | offset); | |
3f47be5c EZ |
1326 | |
1327 | error ("Cannot find thread-local values on this target."); | |
1328 | } | |
1329 | ||
fb0e1ba7 MK |
1330 | static void |
1331 | init_thread_db_ops (void) | |
1332 | { | |
1333 | thread_db_ops.to_shortname = "multi-thread"; | |
1334 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1335 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
c194fbe1 | 1336 | thread_db_ops.to_attach = thread_db_attach; |
fb0e1ba7 MK |
1337 | thread_db_ops.to_detach = thread_db_detach; |
1338 | thread_db_ops.to_resume = thread_db_resume; | |
1339 | thread_db_ops.to_wait = thread_db_wait; | |
1340 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1341 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
1342 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
1343 | thread_db_ops.to_kill = thread_db_kill; | |
1344 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1345 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1346 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1347 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1348 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1349 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1350 | thread_db_ops.to_stratum = thread_stratum; | |
1351 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1352 | thread_db_ops.to_get_thread_local_address |
1353 | = thread_db_get_thread_local_address; | |
fb0e1ba7 MK |
1354 | thread_db_ops.to_magic = OPS_MAGIC; |
1355 | } | |
1356 | ||
1357 | void | |
1358 | _initialize_thread_db (void) | |
1359 | { | |
1360 | /* Only initialize the module if we can load libthread_db. */ | |
1361 | if (thread_db_load ()) | |
1362 | { | |
1363 | init_thread_db_ops (); | |
1364 | add_target (&thread_db_ops); | |
1365 | ||
1366 | /* Add ourselves to objfile event chain. */ | |
9a4105ab AC |
1367 | target_new_objfile_chain = deprecated_target_new_objfile_hook; |
1368 | deprecated_target_new_objfile_hook = thread_db_new_objfile; | |
fb0e1ba7 MK |
1369 | } |
1370 | } |