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 | ||
c194fbe1 MK |
66 | /* Non-zero if we have to keep this module's target vector active |
67 | across re-runs. */ | |
bda9cb72 MK |
68 | static int keep_thread_db; |
69 | ||
fb0e1ba7 MK |
70 | /* Non-zero if we have determined the signals used by the threads |
71 | library. */ | |
72 | static int thread_signals; | |
73 | static sigset_t thread_stop_set; | |
74 | static sigset_t thread_print_set; | |
75 | ||
76 | /* Structure that identifies the child process for the | |
77 | <proc_service.h> interface. */ | |
78 | static struct ps_prochandle proc_handle; | |
79 | ||
80 | /* Connection to the libthread_db library. */ | |
81 | static td_thragent_t *thread_agent; | |
82 | ||
83 | /* Pointers to the libthread_db functions. */ | |
84 | ||
85 | static td_err_e (*td_init_p) (void); | |
86 | ||
b4acd559 JJ |
87 | static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
88 | td_thragent_t **ta); | |
fb0e1ba7 MK |
89 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
90 | td_thrhandle_t *__th); | |
b4acd559 JJ |
91 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, |
92 | lwpid_t lwpid, td_thrhandle_t *th); | |
fb0e1ba7 | 93 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, |
b4acd559 JJ |
94 | td_thr_iter_f *callback, void *cbdata_p, |
95 | td_thr_state_e state, int ti_pri, | |
96 | sigset_t *ti_sigmask_p, | |
fb0e1ba7 MK |
97 | unsigned int ti_user_flags); |
98 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
99 | td_event_e event, td_notify_t *ptr); | |
100 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
101 | td_thr_events_t *event); | |
102 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
103 | td_event_msg_t *msg); | |
104 | ||
105 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
106 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
107 | td_thrinfo_t *infop); | |
108 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
109 | gdb_prfpregset_t *regset); | |
110 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
111 | prgregset_t gregs); | |
112 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
113 | const gdb_prfpregset_t *fpregs); | |
114 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
115 | prgregset_t gregs); | |
b4acd559 JJ |
116 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, |
117 | int event); | |
fb0e1ba7 | 118 | |
3f47be5c | 119 | static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
b4acd559 JJ |
120 | void *map_address, |
121 | size_t offset, void **address); | |
3f47be5c | 122 | |
fb0e1ba7 MK |
123 | /* Location of the thread creation event breakpoint. The code at this |
124 | location in the child process will be called by the pthread library | |
125 | whenever a new thread is created. By setting a special breakpoint | |
126 | at this location, GDB can detect when a new thread is created. We | |
127 | obtain this location via the td_ta_event_addr call. */ | |
128 | static CORE_ADDR td_create_bp_addr; | |
129 | ||
130 | /* Location of the thread death event breakpoint. */ | |
131 | static CORE_ADDR td_death_bp_addr; | |
132 | ||
133 | /* Prototypes for local functions. */ | |
bda9cb72 | 134 | static void thread_db_find_new_threads (void); |
5365276c DJ |
135 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
136 | const td_thrinfo_t *ti_p, int verbose); | |
a2f23071 | 137 | static void detach_thread (ptid_t ptid, int verbose); |
fb0e1ba7 MK |
138 | \f |
139 | ||
140 | /* Building process ids. */ | |
141 | ||
ca6724c1 KB |
142 | #define GET_PID(ptid) ptid_get_pid (ptid) |
143 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
144 | #define GET_THREAD(ptid) ptid_get_tid (ptid) | |
fb0e1ba7 | 145 | |
ca6724c1 KB |
146 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) |
147 | #define is_thread(ptid) (GET_THREAD (ptid) != 0) | |
fb0e1ba7 | 148 | |
ca6724c1 KB |
149 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) |
150 | #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid) | |
fb0e1ba7 MK |
151 | \f |
152 | ||
5365276c DJ |
153 | /* Use "struct private_thread_info" to cache thread state. This is |
154 | a substantial optimization. */ | |
155 | ||
fb0e1ba7 MK |
156 | struct private_thread_info |
157 | { | |
a2f23071 DJ |
158 | /* Flag set when we see a TD_DEATH event for this thread. */ |
159 | unsigned int dying:1; | |
160 | ||
5365276c | 161 | /* Cached thread state. */ |
b4acd559 JJ |
162 | unsigned int th_valid:1; |
163 | unsigned int ti_valid:1; | |
5365276c DJ |
164 | |
165 | td_thrhandle_t th; | |
166 | td_thrinfo_t ti; | |
fb0e1ba7 | 167 | }; |
fb0e1ba7 | 168 | \f |
21bf60fe | 169 | |
fb0e1ba7 MK |
170 | static char * |
171 | thread_db_err_str (td_err_e err) | |
172 | { | |
173 | static char buf[64]; | |
174 | ||
175 | switch (err) | |
176 | { | |
177 | case TD_OK: | |
178 | return "generic 'call succeeded'"; | |
179 | case TD_ERR: | |
180 | return "generic error"; | |
181 | case TD_NOTHR: | |
182 | return "no thread to satisfy query"; | |
183 | case TD_NOSV: | |
184 | return "no sync handle to satisfy query"; | |
185 | case TD_NOLWP: | |
186 | return "no LWP to satisfy query"; | |
187 | case TD_BADPH: | |
188 | return "invalid process handle"; | |
189 | case TD_BADTH: | |
190 | return "invalid thread handle"; | |
191 | case TD_BADSH: | |
192 | return "invalid synchronization handle"; | |
193 | case TD_BADTA: | |
194 | return "invalid thread agent"; | |
195 | case TD_BADKEY: | |
196 | return "invalid key"; | |
197 | case TD_NOMSG: | |
198 | return "no event message for getmsg"; | |
199 | case TD_NOFPREGS: | |
200 | return "FPU register set not available"; | |
201 | case TD_NOLIBTHREAD: | |
202 | return "application not linked with libthread"; | |
203 | case TD_NOEVENT: | |
204 | return "requested event is not supported"; | |
205 | case TD_NOCAPAB: | |
206 | return "capability not available"; | |
207 | case TD_DBERR: | |
208 | return "debugger service failed"; | |
209 | case TD_NOAPLIC: | |
210 | return "operation not applicable to"; | |
211 | case TD_NOTSD: | |
212 | return "no thread-specific data for this thread"; | |
213 | case TD_MALLOC: | |
214 | return "malloc failed"; | |
215 | case TD_PARTIALREG: | |
216 | return "only part of register set was written/read"; | |
217 | case TD_NOXREGS: | |
218 | return "X register set not available for this thread"; | |
219 | default: | |
220 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
221 | return buf; | |
222 | } | |
223 | } | |
224 | ||
225 | static char * | |
226 | thread_db_state_str (td_thr_state_e state) | |
227 | { | |
228 | static char buf[64]; | |
229 | ||
230 | switch (state) | |
231 | { | |
232 | case TD_THR_STOPPED: | |
233 | return "stopped by debugger"; | |
234 | case TD_THR_RUN: | |
235 | return "runnable"; | |
236 | case TD_THR_ACTIVE: | |
237 | return "active"; | |
238 | case TD_THR_ZOMBIE: | |
239 | return "zombie"; | |
240 | case TD_THR_SLEEP: | |
241 | return "sleeping"; | |
242 | case TD_THR_STOPPED_ASLEEP: | |
243 | return "stopped by debugger AND blocked"; | |
244 | default: | |
245 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
246 | return buf; | |
247 | } | |
248 | } | |
249 | \f | |
5365276c | 250 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 251 | threads to LWPs. |
5365276c DJ |
252 | |
253 | THP is a handle to the current thread; if INFOP is not NULL, the | |
254 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
255 | *INFOP. |
256 | ||
257 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
258 | zero is returned to indicate success. */ | |
5365276c DJ |
259 | |
260 | static int | |
261 | thread_get_info_callback (const td_thrhandle_t *thp, void *infop) | |
262 | { | |
263 | td_thrinfo_t ti; | |
264 | td_err_e err; | |
265 | struct thread_info *thread_info; | |
266 | ptid_t thread_ptid; | |
267 | ||
268 | err = td_thr_get_info_p (thp, &ti); | |
269 | if (err != TD_OK) | |
b4acd559 | 270 | error ("thread_get_info_callback: cannot get thread info: %s", |
5365276c DJ |
271 | thread_db_err_str (err)); |
272 | ||
273 | /* Fill the cache. */ | |
274 | thread_ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); | |
275 | thread_info = find_thread_pid (thread_ptid); | |
276 | ||
b9b5d7ea | 277 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 278 | attach to it thinking it is a new thread. */ |
b9b5d7ea JJ |
279 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
280 | { | |
281 | if (infop != NULL) | |
282 | *(struct thread_info **) infop = thread_info; | |
f90ef764 JJ |
283 | if (thread_info != NULL) |
284 | { | |
285 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
286 | thread_info->private->th_valid = 1; | |
287 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
288 | thread_info->private->ti_valid = 1; | |
289 | } | |
b9b5d7ea JJ |
290 | return TD_THR_ZOMBIE; |
291 | } | |
292 | ||
5365276c DJ |
293 | if (thread_info == NULL) |
294 | { | |
295 | /* New thread. Attach to it now (why wait?). */ | |
296 | attach_thread (thread_ptid, thp, &ti, 1); | |
297 | thread_info = find_thread_pid (thread_ptid); | |
298 | gdb_assert (thread_info != NULL); | |
299 | } | |
300 | ||
301 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
302 | thread_info->private->th_valid = 1; | |
303 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
304 | thread_info->private->ti_valid = 1; | |
305 | ||
306 | if (infop != NULL) | |
307 | *(struct thread_info **) infop = thread_info; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | /* Accessor functions for the thread_db information, with caching. */ | |
fb0e1ba7 | 313 | |
5365276c DJ |
314 | static void |
315 | thread_db_map_id2thr (struct thread_info *thread_info, int fatal) | |
316 | { | |
317 | td_err_e err; | |
318 | ||
319 | if (thread_info->private->th_valid) | |
320 | return; | |
321 | ||
322 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid), | |
323 | &thread_info->private->th); | |
324 | if (err != TD_OK) | |
325 | { | |
326 | if (fatal) | |
327 | error ("Cannot find thread %ld: %s", | |
b4acd559 JJ |
328 | (long) GET_THREAD (thread_info->ptid), |
329 | thread_db_err_str (err)); | |
5365276c DJ |
330 | } |
331 | else | |
332 | thread_info->private->th_valid = 1; | |
333 | } | |
334 | ||
335 | static td_thrinfo_t * | |
336 | thread_db_get_info (struct thread_info *thread_info) | |
337 | { | |
338 | td_err_e err; | |
339 | ||
340 | if (thread_info->private->ti_valid) | |
341 | return &thread_info->private->ti; | |
342 | ||
b4acd559 | 343 | if (!thread_info->private->th_valid) |
5365276c DJ |
344 | thread_db_map_id2thr (thread_info, 1); |
345 | ||
b4acd559 JJ |
346 | err = |
347 | td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti); | |
5365276c | 348 | if (err != TD_OK) |
b4acd559 | 349 | error ("thread_db_get_info: cannot get thread info: %s", |
5365276c DJ |
350 | thread_db_err_str (err)); |
351 | ||
352 | thread_info->private->ti_valid = 1; | |
353 | return &thread_info->private->ti; | |
354 | } | |
355 | \f | |
fb0e1ba7 MK |
356 | /* Convert between user-level thread ids and LWP ids. */ |
357 | ||
39f77062 KB |
358 | static ptid_t |
359 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 360 | { |
fb0e1ba7 MK |
361 | td_thrhandle_t th; |
362 | td_err_e err; | |
5365276c DJ |
363 | struct thread_info *thread_info; |
364 | ptid_t thread_ptid; | |
fb0e1ba7 | 365 | |
39f77062 KB |
366 | if (GET_LWP (ptid) == 0) |
367 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); | |
fb0e1ba7 | 368 | |
39f77062 | 369 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 370 | |
39f77062 | 371 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
fb0e1ba7 | 372 | if (err != TD_OK) |
823ca731 | 373 | error ("Cannot find user-level thread for LWP %ld: %s", |
39f77062 | 374 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 375 | |
5365276c | 376 | thread_info = NULL; |
b9b5d7ea JJ |
377 | |
378 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the | |
379 | event thread has already died. If another gdb interface has called | |
380 | thread_alive() previously, the thread won't be found on the thread list | |
381 | anymore. In that case, we don't want to process this ptid anymore | |
382 | to avoid the possibility of later treating it as a newly | |
383 | discovered thread id that we should add to the list. Thus, | |
384 | we return a -1 ptid which is also how the thread list marks a | |
385 | dead thread. */ | |
386 | if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE | |
387 | && thread_info == NULL) | |
388 | return pid_to_ptid (-1); | |
389 | ||
5365276c | 390 | gdb_assert (thread_info && thread_info->private->ti_valid); |
fb0e1ba7 | 391 | |
5365276c | 392 | return BUILD_THREAD (thread_info->private->ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 MK |
393 | } |
394 | ||
39f77062 KB |
395 | static ptid_t |
396 | lwp_from_thread (ptid_t ptid) | |
fb0e1ba7 | 397 | { |
5365276c DJ |
398 | struct thread_info *thread_info; |
399 | ptid_t thread_ptid; | |
fb0e1ba7 | 400 | |
21bf60fe | 401 | if (!is_thread (ptid)) |
39f77062 | 402 | return ptid; |
fb0e1ba7 | 403 | |
5365276c DJ |
404 | thread_info = find_thread_pid (ptid); |
405 | thread_db_get_info (thread_info); | |
fb0e1ba7 | 406 | |
5365276c | 407 | return BUILD_LWP (thread_info->private->ti.ti_lid, GET_PID (ptid)); |
fb0e1ba7 MK |
408 | } |
409 | \f | |
410 | ||
411 | void | |
412 | thread_db_init (struct target_ops *target) | |
413 | { | |
414 | target_beneath = target; | |
415 | } | |
416 | ||
5220ea4c AC |
417 | static void * |
418 | verbose_dlsym (void *handle, const char *name) | |
419 | { | |
420 | void *sym = dlsym (handle, name); | |
421 | if (sym == NULL) | |
422 | warning ("Symbol \"%s\" not found in libthread_db: %s", name, dlerror ()); | |
423 | return sym; | |
424 | } | |
425 | ||
fb0e1ba7 MK |
426 | static int |
427 | thread_db_load (void) | |
428 | { | |
429 | void *handle; | |
430 | td_err_e err; | |
431 | ||
432 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
433 | if (handle == NULL) | |
f7c1e0f3 | 434 | { |
b4acd559 | 435 | fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
f7c1e0f3 | 436 | LIBTHREAD_DB_SO, dlerror ()); |
b4acd559 | 437 | fprintf_filtered (gdb_stderr, |
f7c1e0f3 MS |
438 | "GDB will not be able to debug pthreads.\n\n"); |
439 | return 0; | |
440 | } | |
fb0e1ba7 MK |
441 | |
442 | /* Initialize pointers to the dynamic library functions we will use. | |
443 | Essential functions first. */ | |
444 | ||
5220ea4c | 445 | td_init_p = verbose_dlsym (handle, "td_init"); |
fb0e1ba7 MK |
446 | if (td_init_p == NULL) |
447 | return 0; | |
448 | ||
5220ea4c | 449 | td_ta_new_p = verbose_dlsym (handle, "td_ta_new"); |
fb0e1ba7 MK |
450 | if (td_ta_new_p == NULL) |
451 | return 0; | |
452 | ||
5220ea4c | 453 | td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr"); |
fb0e1ba7 MK |
454 | if (td_ta_map_id2thr_p == NULL) |
455 | return 0; | |
456 | ||
5220ea4c | 457 | td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr"); |
fb0e1ba7 MK |
458 | if (td_ta_map_lwp2thr_p == NULL) |
459 | return 0; | |
460 | ||
5220ea4c | 461 | td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter"); |
fb0e1ba7 MK |
462 | if (td_ta_thr_iter_p == NULL) |
463 | return 0; | |
464 | ||
5220ea4c | 465 | td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate"); |
fb0e1ba7 MK |
466 | if (td_thr_validate_p == NULL) |
467 | return 0; | |
468 | ||
5220ea4c | 469 | td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info"); |
fb0e1ba7 MK |
470 | if (td_thr_get_info_p == NULL) |
471 | return 0; | |
472 | ||
5220ea4c | 473 | td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs"); |
fb0e1ba7 MK |
474 | if (td_thr_getfpregs_p == NULL) |
475 | return 0; | |
476 | ||
5220ea4c | 477 | td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs"); |
fb0e1ba7 MK |
478 | if (td_thr_getgregs_p == NULL) |
479 | return 0; | |
480 | ||
5220ea4c | 481 | td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs"); |
fb0e1ba7 MK |
482 | if (td_thr_setfpregs_p == NULL) |
483 | return 0; | |
484 | ||
5220ea4c | 485 | td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs"); |
fb0e1ba7 MK |
486 | if (td_thr_setgregs_p == NULL) |
487 | return 0; | |
488 | ||
489 | /* Initialize the library. */ | |
490 | err = td_init_p (); | |
491 | if (err != TD_OK) | |
492 | { | |
493 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | /* These are not essential. */ | |
498 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
499 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
500 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
501 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
3f47be5c | 502 | td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
fb0e1ba7 MK |
503 | |
504 | return 1; | |
505 | } | |
506 | ||
cdbc0b18 | 507 | static td_err_e |
24557e30 AC |
508 | enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp) |
509 | { | |
510 | td_notify_t notify; | |
cdbc0b18 | 511 | td_err_e err; |
24557e30 AC |
512 | |
513 | /* Get the breakpoint address for thread EVENT. */ | |
514 | err = td_ta_event_addr_p (thread_agent, event, ¬ify); | |
515 | if (err != TD_OK) | |
cdbc0b18 | 516 | return err; |
24557e30 AC |
517 | |
518 | /* Set up the breakpoint. */ | |
519 | (*bp) = gdbarch_convert_from_func_ptr_addr (current_gdbarch, | |
520 | (CORE_ADDR) notify.u.bptaddr, | |
521 | ¤t_target); | |
522 | create_thread_event_breakpoint ((*bp)); | |
523 | ||
cdbc0b18 | 524 | return TD_OK; |
24557e30 AC |
525 | } |
526 | ||
fb0e1ba7 MK |
527 | static void |
528 | enable_thread_event_reporting (void) | |
529 | { | |
530 | td_thr_events_t events; | |
531 | td_notify_t notify; | |
532 | td_err_e err; | |
a2f23071 DJ |
533 | #ifdef HAVE_GNU_LIBC_VERSION_H |
534 | const char *libc_version; | |
535 | int libc_major, libc_minor; | |
536 | #endif | |
fb0e1ba7 MK |
537 | |
538 | /* We cannot use the thread event reporting facility if these | |
539 | functions aren't available. */ | |
540 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
541 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
542 | return; | |
543 | ||
544 | /* Set the process wide mask saying which events we're interested in. */ | |
545 | td_event_emptyset (&events); | |
546 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
547 | |
548 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
fb0e1ba7 MK |
549 | /* FIXME: kettenis/2000-04-23: The event reporting facility is |
550 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
551 | now. */ | |
a2f23071 DJ |
552 | libc_version = gnu_get_libc_version (); |
553 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
554 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 555 | #endif |
a2f23071 | 556 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 MK |
557 | |
558 | err = td_ta_set_event_p (thread_agent, &events); | |
559 | if (err != TD_OK) | |
560 | { | |
561 | warning ("Unable to set global thread event mask: %s", | |
562 | thread_db_err_str (err)); | |
563 | return; | |
564 | } | |
565 | ||
566 | /* Delete previous thread event breakpoints, if any. */ | |
567 | remove_thread_event_breakpoints (); | |
24557e30 AC |
568 | td_create_bp_addr = 0; |
569 | td_death_bp_addr = 0; | |
fb0e1ba7 | 570 | |
24557e30 | 571 | /* Set up the thread creation event. */ |
cdbc0b18 RM |
572 | err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr); |
573 | if (err != TD_OK) | |
fb0e1ba7 MK |
574 | { |
575 | warning ("Unable to get location for thread creation breakpoint: %s", | |
576 | thread_db_err_str (err)); | |
577 | return; | |
578 | } | |
579 | ||
24557e30 | 580 | /* Set up the thread death event. */ |
cdbc0b18 RM |
581 | err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr); |
582 | if (err != TD_OK) | |
fb0e1ba7 | 583 | { |
936742ab | 584 | warning ("Unable to get location for thread death breakpoint: %s", |
fb0e1ba7 MK |
585 | thread_db_err_str (err)); |
586 | return; | |
587 | } | |
fb0e1ba7 MK |
588 | } |
589 | ||
590 | static void | |
591 | disable_thread_event_reporting (void) | |
592 | { | |
593 | td_thr_events_t events; | |
594 | ||
595 | /* Set the process wide mask saying we aren't interested in any | |
596 | events anymore. */ | |
597 | td_event_emptyset (&events); | |
598 | td_ta_set_event_p (thread_agent, &events); | |
599 | ||
600 | /* Delete thread event breakpoints, if any. */ | |
601 | remove_thread_event_breakpoints (); | |
602 | td_create_bp_addr = 0; | |
603 | td_death_bp_addr = 0; | |
604 | } | |
605 | ||
606 | static void | |
607 | check_thread_signals (void) | |
608 | { | |
609 | #ifdef GET_THREAD_SIGNALS | |
21bf60fe | 610 | if (!thread_signals) |
fb0e1ba7 MK |
611 | { |
612 | sigset_t mask; | |
613 | int i; | |
614 | ||
615 | GET_THREAD_SIGNALS (&mask); | |
616 | sigemptyset (&thread_stop_set); | |
617 | sigemptyset (&thread_print_set); | |
618 | ||
b9569773 | 619 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
620 | { |
621 | if (sigismember (&mask, i)) | |
622 | { | |
623 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
624 | sigaddset (&thread_stop_set, i); | |
625 | if (signal_print_update (target_signal_from_host (i), 0)) | |
626 | sigaddset (&thread_print_set, i); | |
627 | thread_signals = 1; | |
628 | } | |
629 | } | |
630 | } | |
631 | #endif | |
632 | } | |
633 | ||
fb0e1ba7 MK |
634 | static void |
635 | thread_db_new_objfile (struct objfile *objfile) | |
636 | { | |
637 | td_err_e err; | |
638 | ||
5220ea4c AC |
639 | /* First time through, report that libthread_db was successfuly |
640 | loaded. Can't print this in in thread_db_load as, at that stage, | |
641 | the interpreter and it's console haven't started. The real | |
642 | problem here is that libthread_db is loaded too early - it should | |
643 | only be loaded when there is a program to debug. */ | |
644 | { | |
645 | static int dejavu; | |
646 | if (!dejavu) | |
647 | { | |
648 | Dl_info info; | |
649 | const char *library = NULL; | |
650 | /* Try dladdr. */ | |
651 | if (dladdr ((*td_ta_new_p), &info) != 0) | |
652 | library = info.dli_fname; | |
653 | /* Try dlinfo? */ | |
654 | if (library == NULL) | |
655 | /* Paranoid - don't let a NULL path slip through. */ | |
656 | library = LIBTHREAD_DB_SO; | |
657 | printf_unfiltered ("Using host libthread_db library \"%s\".\n", | |
658 | library); | |
659 | dejavu = 1; | |
660 | } | |
661 | } | |
662 | ||
5bbd998e MS |
663 | /* Don't attempt to use thread_db on targets which can not run |
664 | (core files). */ | |
665 | if (objfile == NULL || !target_has_execution) | |
bda9cb72 MK |
666 | { |
667 | /* All symbols have been discarded. If the thread_db target is | |
c194fbe1 | 668 | active, deactivate it now. */ |
bda9cb72 | 669 | if (using_thread_db) |
c194fbe1 MK |
670 | { |
671 | gdb_assert (proc_handle.pid == 0); | |
672 | unpush_target (&thread_db_ops); | |
673 | using_thread_db = 0; | |
674 | } | |
675 | ||
676 | keep_thread_db = 0; | |
bda9cb72 MK |
677 | |
678 | goto quit; | |
679 | } | |
680 | ||
fb0e1ba7 MK |
681 | if (using_thread_db) |
682 | /* Nothing to do. The thread library was already detected and the | |
683 | target vector was already activated. */ | |
684 | goto quit; | |
685 | ||
bda9cb72 MK |
686 | /* Initialize the structure that identifies the child process. Note |
687 | that at this point there is no guarantee that we actually have a | |
688 | child process. */ | |
39f77062 | 689 | proc_handle.pid = GET_PID (inferior_ptid); |
fb0e1ba7 | 690 | |
bda9cb72 | 691 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
692 | err = td_ta_new_p (&proc_handle, &thread_agent); |
693 | switch (err) | |
694 | { | |
695 | case TD_NOLIBTHREAD: | |
bda9cb72 | 696 | /* No thread library was detected. */ |
fb0e1ba7 MK |
697 | break; |
698 | ||
699 | case TD_OK: | |
5220ea4c AC |
700 | printf_unfiltered ("[Thread debugging using libthread_db enabled]\n"); |
701 | ||
bda9cb72 MK |
702 | /* The thread library was detected. Activate the thread_db target. */ |
703 | push_target (&thread_db_ops); | |
704 | using_thread_db = 1; | |
705 | ||
706 | /* If the thread library was detected in the main symbol file | |
707 | itself, we assume that the program was statically linked | |
708 | against the thread library and well have to keep this | |
709 | module's target vector activated until forever... Well, at | |
710 | least until all symbols have been discarded anyway (see | |
711 | above). */ | |
712 | if (objfile == symfile_objfile) | |
713 | { | |
714 | gdb_assert (proc_handle.pid == 0); | |
715 | keep_thread_db = 1; | |
716 | } | |
717 | ||
718 | /* We can only poke around if there actually is a child process. | |
719 | If there is no child process alive, postpone the steps below | |
720 | until one has been created. */ | |
721 | if (proc_handle.pid != 0) | |
722 | { | |
723 | enable_thread_event_reporting (); | |
724 | thread_db_find_new_threads (); | |
725 | } | |
fb0e1ba7 MK |
726 | break; |
727 | ||
728 | default: | |
729 | warning ("Cannot initialize thread debugging library: %s", | |
730 | thread_db_err_str (err)); | |
731 | break; | |
732 | } | |
733 | ||
b4acd559 | 734 | quit: |
540af400 MS |
735 | if (target_new_objfile_chain) |
736 | target_new_objfile_chain (objfile); | |
fb0e1ba7 MK |
737 | } |
738 | ||
a2f23071 DJ |
739 | /* Attach to a new thread. This function is called when we receive a |
740 | TD_CREATE event or when we iterate over all threads and find one | |
741 | that wasn't already in our list. */ | |
742 | ||
fb0e1ba7 | 743 | static void |
39f77062 | 744 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
fb0e1ba7 MK |
745 | const td_thrinfo_t *ti_p, int verbose) |
746 | { | |
747 | struct thread_info *tp; | |
748 | td_err_e err; | |
749 | ||
a2f23071 DJ |
750 | /* If we're being called after a TD_CREATE event, we may already |
751 | know about this thread. There are two ways this can happen. We | |
752 | may have iterated over all threads between the thread creation | |
753 | and the TD_CREATE event, for instance when the user has issued | |
754 | the `info threads' command before the SIGTRAP for hitting the | |
755 | thread creation breakpoint was reported. Alternatively, the | |
756 | thread may have exited and a new one been created with the same | |
757 | thread ID. In the first case we don't need to do anything; in | |
758 | the second case we should discard information about the dead | |
759 | thread and attach to the new one. */ | |
760 | if (in_thread_list (ptid)) | |
761 | { | |
762 | tp = find_thread_pid (ptid); | |
763 | gdb_assert (tp != NULL); | |
764 | ||
765 | if (!tp->private->dying) | |
766 | return; | |
767 | ||
768 | delete_thread (ptid); | |
769 | } | |
770 | ||
fb0e1ba7 MK |
771 | check_thread_signals (); |
772 | ||
fb0e1ba7 | 773 | /* Add the thread to GDB's thread list. */ |
39f77062 | 774 | tp = add_thread (ptid); |
fb0e1ba7 | 775 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
5365276c DJ |
776 | memset (tp->private, 0, sizeof (struct private_thread_info)); |
777 | ||
778 | if (verbose) | |
779 | printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid)); | |
fb0e1ba7 | 780 | |
21bf60fe MK |
781 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
782 | return; /* A zombie thread -- do not attach. */ | |
5fd913cc | 783 | |
8605d56e | 784 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
fb0e1ba7 | 785 | #ifdef ATTACH_LWP |
c194fbe1 | 786 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); |
fb0e1ba7 MK |
787 | #endif |
788 | ||
789 | /* Enable thread event reporting for this thread. */ | |
790 | err = td_thr_event_enable_p (th_p, 1); | |
791 | if (err != TD_OK) | |
792 | error ("Cannot enable thread event reporting for %s: %s", | |
39f77062 | 793 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
794 | } |
795 | ||
c194fbe1 MK |
796 | static void |
797 | thread_db_attach (char *args, int from_tty) | |
798 | { | |
799 | target_beneath->to_attach (args, from_tty); | |
800 | ||
801 | /* Destroy thread info; it's no longer valid. */ | |
802 | init_thread_list (); | |
803 | ||
804 | /* The child process is now the actual multi-threaded | |
805 | program. Snatch its process ID... */ | |
806 | proc_handle.pid = GET_PID (inferior_ptid); | |
807 | ||
808 | /* ...and perform the remaining initialization steps. */ | |
809 | enable_thread_event_reporting (); | |
b4acd559 | 810 | thread_db_find_new_threads (); |
c194fbe1 MK |
811 | } |
812 | ||
fb0e1ba7 | 813 | static void |
39f77062 | 814 | detach_thread (ptid_t ptid, int verbose) |
fb0e1ba7 | 815 | { |
a2f23071 DJ |
816 | struct thread_info *thread_info; |
817 | ||
fb0e1ba7 | 818 | if (verbose) |
39f77062 | 819 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); |
a2f23071 DJ |
820 | |
821 | /* Don't delete the thread now, because it still reports as active | |
822 | until it has executed a few instructions after the event | |
823 | breakpoint - if we deleted it now, "info threads" would cause us | |
824 | to re-attach to it. Just mark it as having had a TD_DEATH | |
825 | event. This means that we won't delete it from our thread list | |
826 | until we notice that it's dead (via prune_threads), or until | |
827 | something re-uses its thread ID. */ | |
828 | thread_info = find_thread_pid (ptid); | |
829 | gdb_assert (thread_info != NULL); | |
830 | thread_info->private->dying = 1; | |
fb0e1ba7 MK |
831 | } |
832 | ||
833 | static void | |
834 | thread_db_detach (char *args, int from_tty) | |
835 | { | |
836 | disable_thread_event_reporting (); | |
c194fbe1 MK |
837 | |
838 | /* There's no need to save & restore inferior_ptid here, since the | |
839 | inferior is supposed to be survive this function call. */ | |
840 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
841 | ||
842 | /* Forget about the child's process ID. We shouldn't need it | |
843 | anymore. */ | |
844 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
845 | |
846 | target_beneath->to_detach (args, from_tty); | |
847 | } | |
848 | ||
5365276c DJ |
849 | static int |
850 | clear_lwpid_callback (struct thread_info *thread, void *dummy) | |
851 | { | |
852 | /* If we know that our thread implementation is 1-to-1, we could save | |
853 | a certain amount of information; it's not clear how much, so we | |
854 | are always conservative. */ | |
855 | ||
856 | thread->private->th_valid = 0; | |
857 | thread->private->ti_valid = 0; | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
fb0e1ba7 | 862 | static void |
39f77062 | 863 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 | 864 | { |
39f77062 | 865 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 866 | |
39f77062 KB |
867 | if (GET_PID (ptid) == -1) |
868 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
869 | else if (is_thread (ptid)) | |
870 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 871 | |
5365276c DJ |
872 | /* Clear cached data which may not be valid after the resume. */ |
873 | iterate_over_threads (clear_lwpid_callback, NULL); | |
874 | ||
39f77062 | 875 | target_beneath->to_resume (ptid, step, signo); |
fb0e1ba7 MK |
876 | |
877 | do_cleanups (old_chain); | |
878 | } | |
879 | ||
880 | /* Check if PID is currently stopped at the location of a thread event | |
881 | breakpoint location. If it is, read the event message and act upon | |
882 | the event. */ | |
883 | ||
884 | static void | |
39f77062 | 885 | check_event (ptid_t ptid) |
fb0e1ba7 MK |
886 | { |
887 | td_event_msg_t msg; | |
888 | td_thrinfo_t ti; | |
889 | td_err_e err; | |
890 | CORE_ADDR stop_pc; | |
4d9850d3 | 891 | int loop = 0; |
fb0e1ba7 MK |
892 | |
893 | /* Bail out early if we're not at a thread event breakpoint. */ | |
39f77062 | 894 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
fb0e1ba7 MK |
895 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
896 | return; | |
897 | ||
4d9850d3 JJ |
898 | /* If we are at a create breakpoint, we do not know what new lwp |
899 | was created and cannot specifically locate the event message for it. | |
900 | We have to call td_ta_event_getmsg() to get | |
901 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 902 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 903 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
904 | This guarantees we will process the correct message before continuing |
905 | from the breakpoint. | |
4d9850d3 JJ |
906 | |
907 | Currently, death events are not enabled. If they are enabled, | |
908 | the death event can use the td_thr_event_getmsg() interface to | |
909 | get the message specifically for that lwp and avoid looping | |
910 | below. */ | |
911 | ||
912 | loop = 1; | |
913 | ||
914 | do | |
fb0e1ba7 | 915 | { |
4d9850d3 JJ |
916 | err = td_ta_event_getmsg_p (thread_agent, &msg); |
917 | if (err != TD_OK) | |
918 | { | |
919 | if (err == TD_NOMSG) | |
920 | return; | |
fb0e1ba7 | 921 | |
4d9850d3 JJ |
922 | error ("Cannot get thread event message: %s", |
923 | thread_db_err_str (err)); | |
924 | } | |
fb0e1ba7 | 925 | |
4d9850d3 JJ |
926 | err = td_thr_get_info_p (msg.th_p, &ti); |
927 | if (err != TD_OK) | |
928 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
fb0e1ba7 | 929 | |
4d9850d3 | 930 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 | 931 | |
4d9850d3 JJ |
932 | switch (msg.event) |
933 | { | |
934 | case TD_CREATE: | |
a2f23071 DJ |
935 | /* Call attach_thread whether or not we already know about a |
936 | thread with this thread ID. */ | |
937 | attach_thread (ptid, msg.th_p, &ti, 1); | |
fb0e1ba7 | 938 | |
4d9850d3 | 939 | break; |
fb0e1ba7 | 940 | |
4d9850d3 | 941 | case TD_DEATH: |
fb0e1ba7 | 942 | |
4d9850d3 JJ |
943 | if (!in_thread_list (ptid)) |
944 | error ("Spurious thread death event."); | |
fb0e1ba7 | 945 | |
4d9850d3 | 946 | detach_thread (ptid, 1); |
fb0e1ba7 | 947 | |
4d9850d3 | 948 | break; |
fb0e1ba7 | 949 | |
4d9850d3 JJ |
950 | default: |
951 | error ("Spurious thread event."); | |
952 | } | |
fb0e1ba7 | 953 | } |
4d9850d3 | 954 | while (loop); |
fb0e1ba7 MK |
955 | } |
956 | ||
39f77062 KB |
957 | static ptid_t |
958 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 | 959 | { |
39f77062 | 960 | extern ptid_t trap_ptid; |
fb0e1ba7 | 961 | |
39f77062 KB |
962 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
963 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 964 | |
39f77062 | 965 | ptid = target_beneath->to_wait (ptid, ourstatus); |
fb0e1ba7 | 966 | |
bda9cb72 MK |
967 | if (proc_handle.pid == 0) |
968 | /* The current child process isn't the actual multi-threaded | |
969 | program yet, so don't try to do any special thread-specific | |
970 | post-processing and bail out early. */ | |
39f77062 | 971 | return ptid; |
bda9cb72 | 972 | |
fb0e1ba7 | 973 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
39f77062 | 974 | return pid_to_ptid (-1); |
fb0e1ba7 MK |
975 | |
976 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
977 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
978 | /* Check for a thread event. */ | |
39f77062 | 979 | check_event (ptid); |
fb0e1ba7 | 980 | |
39f77062 KB |
981 | if (!ptid_equal (trap_ptid, null_ptid)) |
982 | trap_ptid = thread_from_lwp (trap_ptid); | |
fb0e1ba7 | 983 | |
b9b5d7ea JJ |
984 | /* Change the ptid back into the higher level PID + TID format. |
985 | If the thread is dead and no longer on the thread list, we will | |
986 | get back a dead ptid. This can occur if the thread death event | |
987 | gets postponed by other simultaneous events. In such a case, | |
988 | we want to just ignore the event and continue on. */ | |
989 | ptid = thread_from_lwp (ptid); | |
990 | if (GET_PID (ptid) == -1) | |
991 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
992 | ||
993 | return ptid; | |
fb0e1ba7 MK |
994 | } |
995 | ||
996 | static int | |
997 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
b4acd559 | 998 | struct mem_attrib *attrib, struct target_ops *target) |
fb0e1ba7 | 999 | { |
39f77062 | 1000 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 MK |
1001 | int xfer; |
1002 | ||
39f77062 | 1003 | if (is_thread (inferior_ptid)) |
fb0e1ba7 MK |
1004 | { |
1005 | /* FIXME: This seems to be necessary to make sure breakpoints | |
1006 | are removed. */ | |
21bf60fe | 1007 | if (!target_thread_alive (inferior_ptid)) |
39f77062 | 1008 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1009 | else |
39f77062 | 1010 | inferior_ptid = lwp_from_thread (inferior_ptid); |
fb0e1ba7 MK |
1011 | } |
1012 | ||
b4acd559 JJ |
1013 | xfer = |
1014 | target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, | |
1015 | target); | |
fb0e1ba7 MK |
1016 | |
1017 | do_cleanups (old_chain); | |
1018 | return xfer; | |
1019 | } | |
1020 | ||
1021 | static void | |
1022 | thread_db_fetch_registers (int regno) | |
1023 | { | |
5365276c | 1024 | struct thread_info *thread_info; |
fb0e1ba7 MK |
1025 | prgregset_t gregset; |
1026 | gdb_prfpregset_t fpregset; | |
1027 | td_err_e err; | |
1028 | ||
21bf60fe | 1029 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
1030 | { |
1031 | /* Pass the request to the target beneath us. */ | |
1032 | target_beneath->to_fetch_registers (regno); | |
1033 | return; | |
1034 | } | |
1035 | ||
5365276c DJ |
1036 | thread_info = find_thread_pid (inferior_ptid); |
1037 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 | 1038 | |
5365276c | 1039 | err = td_thr_getgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 MK |
1040 | if (err != TD_OK) |
1041 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
39f77062 | 1042 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 | 1043 | |
5365276c | 1044 | err = td_thr_getfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 MK |
1045 | if (err != TD_OK) |
1046 | error ("Cannot get floating-point registers for thread %ld: %s", | |
39f77062 | 1047 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1048 | |
1049 | /* Note that we must call supply_gregset after calling the thread_db | |
1050 | routines because the thread_db routines call ps_lgetgregs and | |
1051 | friends which clobber GDB's register cache. */ | |
1052 | supply_gregset ((gdb_gregset_t *) gregset); | |
1053 | supply_fpregset (&fpregset); | |
1054 | } | |
1055 | ||
1056 | static void | |
1057 | thread_db_store_registers (int regno) | |
1058 | { | |
fb0e1ba7 MK |
1059 | prgregset_t gregset; |
1060 | gdb_prfpregset_t fpregset; | |
1061 | td_err_e err; | |
5365276c | 1062 | struct thread_info *thread_info; |
fb0e1ba7 | 1063 | |
21bf60fe | 1064 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
1065 | { |
1066 | /* Pass the request to the target beneath us. */ | |
1067 | target_beneath->to_store_registers (regno); | |
1068 | return; | |
1069 | } | |
1070 | ||
5365276c DJ |
1071 | thread_info = find_thread_pid (inferior_ptid); |
1072 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 MK |
1073 | |
1074 | if (regno != -1) | |
1075 | { | |
123a958e | 1076 | char raw[MAX_REGISTER_SIZE]; |
fb0e1ba7 | 1077 | |
4caf0990 | 1078 | deprecated_read_register_gen (regno, raw); |
fb0e1ba7 | 1079 | thread_db_fetch_registers (-1); |
23a6d369 | 1080 | regcache_raw_supply (current_regcache, regno, raw); |
fb0e1ba7 MK |
1081 | } |
1082 | ||
1083 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
1084 | fill_fpregset (&fpregset, -1); | |
1085 | ||
5365276c | 1086 | err = td_thr_setgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 MK |
1087 | if (err != TD_OK) |
1088 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
39f77062 | 1089 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
5365276c | 1090 | err = td_thr_setfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 MK |
1091 | if (err != TD_OK) |
1092 | error ("Cannot store floating-point registers for thread %ld: %s", | |
39f77062 | 1093 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1094 | } |
1095 | ||
1096 | static void | |
1097 | thread_db_kill (void) | |
1098 | { | |
c194fbe1 MK |
1099 | /* There's no need to save & restore inferior_ptid here, since the |
1100 | inferior isn't supposed to survive this function call. */ | |
1101 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
fb0e1ba7 MK |
1102 | target_beneath->to_kill (); |
1103 | } | |
1104 | ||
1105 | static void | |
c27cda74 AC |
1106 | thread_db_create_inferior (char *exec_file, char *allargs, char **env, |
1107 | int from_tty) | |
fb0e1ba7 | 1108 | { |
21bf60fe | 1109 | if (!keep_thread_db) |
c194fbe1 MK |
1110 | { |
1111 | unpush_target (&thread_db_ops); | |
1112 | using_thread_db = 0; | |
1113 | } | |
1114 | ||
c27cda74 | 1115 | target_beneath->to_create_inferior (exec_file, allargs, env, from_tty); |
bda9cb72 | 1116 | } |
fb0e1ba7 | 1117 | |
bda9cb72 | 1118 | static void |
39f77062 | 1119 | thread_db_post_startup_inferior (ptid_t ptid) |
bda9cb72 MK |
1120 | { |
1121 | if (proc_handle.pid == 0) | |
1122 | { | |
1123 | /* The child process is now the actual multi-threaded | |
1124 | program. Snatch its process ID... */ | |
39f77062 | 1125 | proc_handle.pid = GET_PID (ptid); |
fb0e1ba7 | 1126 | |
bda9cb72 MK |
1127 | /* ...and perform the remaining initialization steps. */ |
1128 | enable_thread_event_reporting (); | |
21bf60fe | 1129 | thread_db_find_new_threads (); |
bda9cb72 | 1130 | } |
fb0e1ba7 MK |
1131 | } |
1132 | ||
1133 | static void | |
1134 | thread_db_mourn_inferior (void) | |
1135 | { | |
1136 | remove_thread_event_breakpoints (); | |
c194fbe1 MK |
1137 | |
1138 | /* Forget about the child's process ID. We shouldn't need it | |
1139 | anymore. */ | |
1140 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
1141 | |
1142 | target_beneath->to_mourn_inferior (); | |
043b2f77 JJ |
1143 | |
1144 | /* Detach thread_db target ops if not dealing with a statically | |
1145 | linked threaded program. This allows a corefile to be debugged | |
1146 | after finishing debugging of a threaded program. At present, | |
1147 | debugging a statically-linked threaded program is broken, but | |
1148 | the check is added below in the event that it is fixed in the | |
1149 | future. */ | |
1150 | if (!keep_thread_db) | |
1151 | { | |
1152 | unpush_target (&thread_db_ops); | |
1153 | using_thread_db = 0; | |
1154 | } | |
fb0e1ba7 MK |
1155 | } |
1156 | ||
1157 | static int | |
39f77062 | 1158 | thread_db_thread_alive (ptid_t ptid) |
fb0e1ba7 | 1159 | { |
5fd913cc | 1160 | td_thrhandle_t th; |
21bf60fe | 1161 | td_err_e err; |
5fd913cc | 1162 | |
39f77062 | 1163 | if (is_thread (ptid)) |
fb0e1ba7 | 1164 | { |
5365276c DJ |
1165 | struct thread_info *thread_info; |
1166 | thread_info = find_thread_pid (ptid); | |
fb0e1ba7 | 1167 | |
5365276c | 1168 | thread_db_map_id2thr (thread_info, 0); |
b4acd559 | 1169 | if (!thread_info->private->th_valid) |
fb0e1ba7 MK |
1170 | return 0; |
1171 | ||
5365276c | 1172 | err = td_thr_validate_p (&thread_info->private->th); |
5fd913cc MS |
1173 | if (err != TD_OK) |
1174 | return 0; | |
1175 | ||
b4acd559 | 1176 | if (!thread_info->private->ti_valid) |
5365276c | 1177 | { |
b4acd559 JJ |
1178 | err = |
1179 | td_thr_get_info_p (&thread_info->private->th, | |
1180 | &thread_info->private->ti); | |
5365276c DJ |
1181 | if (err != TD_OK) |
1182 | return 0; | |
1183 | thread_info->private->ti_valid = 1; | |
1184 | } | |
1185 | ||
1186 | if (thread_info->private->ti.ti_state == TD_THR_UNKNOWN | |
1187 | || thread_info->private->ti.ti_state == TD_THR_ZOMBIE) | |
21bf60fe | 1188 | return 0; /* A zombie thread. */ |
5fd913cc | 1189 | |
fb0e1ba7 MK |
1190 | return 1; |
1191 | } | |
1192 | ||
1193 | if (target_beneath->to_thread_alive) | |
39f77062 | 1194 | return target_beneath->to_thread_alive (ptid); |
fb0e1ba7 MK |
1195 | |
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | static int | |
1200 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1201 | { | |
1202 | td_thrinfo_t ti; | |
1203 | td_err_e err; | |
39f77062 | 1204 | ptid_t ptid; |
fb0e1ba7 MK |
1205 | |
1206 | err = td_thr_get_info_p (th_p, &ti); | |
1207 | if (err != TD_OK) | |
b4acd559 | 1208 | error ("find_new_threads_callback: cannot get thread info: %s", |
3197744f | 1209 | thread_db_err_str (err)); |
fb0e1ba7 | 1210 | |
21bf60fe MK |
1211 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1212 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1213 | |
39f77062 | 1214 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); |
fb0e1ba7 | 1215 | |
21bf60fe | 1216 | if (!in_thread_list (ptid)) |
39f77062 | 1217 | attach_thread (ptid, th_p, &ti, 1); |
fb0e1ba7 MK |
1218 | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | static void | |
1223 | thread_db_find_new_threads (void) | |
1224 | { | |
1225 | td_err_e err; | |
1226 | ||
1227 | /* Iterate over all user-space threads to discover new threads. */ | |
1228 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
1229 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
1230 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
1231 | if (err != TD_OK) | |
1232 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
1233 | } | |
1234 | ||
1235 | static char * | |
39f77062 | 1236 | thread_db_pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1237 | { |
39f77062 | 1238 | if (is_thread (ptid)) |
fb0e1ba7 MK |
1239 | { |
1240 | static char buf[64]; | |
5365276c | 1241 | td_thrinfo_t *ti_p; |
fb0e1ba7 | 1242 | td_err_e err; |
5365276c | 1243 | struct thread_info *thread_info; |
fb0e1ba7 | 1244 | |
5365276c DJ |
1245 | thread_info = find_thread_pid (ptid); |
1246 | thread_db_map_id2thr (thread_info, 0); | |
b4acd559 | 1247 | if (!thread_info->private->th_valid) |
5365276c | 1248 | { |
b4acd559 JJ |
1249 | snprintf (buf, sizeof (buf), "Thread %ld (Missing)", |
1250 | GET_THREAD (ptid)); | |
5365276c DJ |
1251 | return buf; |
1252 | } | |
fb0e1ba7 | 1253 | |
5365276c | 1254 | ti_p = thread_db_get_info (thread_info); |
fb0e1ba7 | 1255 | |
5365276c | 1256 | if (ti_p->ti_state == TD_THR_ACTIVE && ti_p->ti_lid != 0) |
fb0e1ba7 MK |
1257 | { |
1258 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
5365276c | 1259 | (long) ti_p->ti_tid, ti_p->ti_lid); |
fb0e1ba7 MK |
1260 | } |
1261 | else | |
1262 | { | |
1263 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
b4acd559 JJ |
1264 | (long) ti_p->ti_tid, |
1265 | thread_db_state_str (ti_p->ti_state)); | |
fb0e1ba7 MK |
1266 | } |
1267 | ||
1268 | return buf; | |
1269 | } | |
1270 | ||
39f77062 KB |
1271 | if (target_beneath->to_pid_to_str (ptid)) |
1272 | return target_beneath->to_pid_to_str (ptid); | |
fb0e1ba7 | 1273 | |
39f77062 | 1274 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1275 | } |
1276 | ||
3f47be5c EZ |
1277 | /* Get the address of the thread local variable in OBJFILE which is |
1278 | stored at OFFSET within the thread local storage for thread PTID. */ | |
1279 | ||
1280 | static CORE_ADDR | |
1281 | thread_db_get_thread_local_address (ptid_t ptid, struct objfile *objfile, | |
b4acd559 | 1282 | CORE_ADDR offset) |
3f47be5c EZ |
1283 | { |
1284 | if (is_thread (ptid)) | |
1285 | { | |
1286 | int objfile_is_library = (objfile->flags & OBJF_SHARED); | |
1287 | td_err_e err; | |
3f47be5c EZ |
1288 | void *address; |
1289 | CORE_ADDR lm; | |
5365276c | 1290 | struct thread_info *thread_info; |
3f47be5c EZ |
1291 | |
1292 | /* glibc doesn't provide the needed interface. */ | |
b4acd559 JJ |
1293 | if (!td_thr_tls_get_addr_p) |
1294 | error ("Cannot find thread-local variables in this thread library."); | |
3f47be5c EZ |
1295 | |
1296 | /* Get the address of the link map for this objfile. */ | |
1297 | lm = svr4_fetch_objfile_link_map (objfile); | |
1298 | ||
1299 | /* Whoops, we couldn't find one. Bail out. */ | |
1300 | if (!lm) | |
b4acd559 JJ |
1301 | { |
1302 | if (objfile_is_library) | |
1303 | error ("Cannot find shared library `%s' link_map in dynamic" | |
3f47be5c EZ |
1304 | " linker's module list", objfile->name); |
1305 | else | |
b4acd559 | 1306 | error ("Cannot find executable file `%s' link_map in dynamic" |
3f47be5c EZ |
1307 | " linker's module list", objfile->name); |
1308 | } | |
1309 | ||
1310 | /* Get info about the thread. */ | |
5365276c DJ |
1311 | thread_info = find_thread_pid (ptid); |
1312 | thread_db_map_id2thr (thread_info, 1); | |
1313 | ||
3f47be5c | 1314 | /* Finally, get the address of the variable. */ |
5365276c DJ |
1315 | err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm, |
1316 | offset, &address); | |
3f47be5c EZ |
1317 | |
1318 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1319 | /* The memory hasn't been allocated, yet. */ | |
1320 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1321 | { |
1322 | /* Now, if libthread_db provided the initialization image's | |
1323 | address, we *could* try to build a non-lvalue value from | |
1324 | the initialization image. */ | |
1325 | if (objfile_is_library) | |
1326 | error ("The inferior has not yet allocated storage for" | |
1327 | " thread-local variables in\n" | |
1328 | "the shared library `%s'\n" | |
1329 | "for the thread %ld", | |
3f47be5c | 1330 | objfile->name, (long) GET_THREAD (ptid)); |
b4acd559 JJ |
1331 | else |
1332 | error ("The inferior has not yet allocated storage for" | |
1333 | " thread-local variables in\n" | |
1334 | "the executable `%s'\n" | |
1335 | "for the thread %ld", | |
3f47be5c EZ |
1336 | objfile->name, (long) GET_THREAD (ptid)); |
1337 | } | |
1338 | #endif | |
1339 | ||
1340 | /* Something else went wrong. */ | |
1341 | if (err != TD_OK) | |
1342 | { | |
1343 | if (objfile_is_library) | |
1344 | error ("Cannot find thread-local storage for thread %ld, " | |
1345 | "shared library %s:\n%s", | |
1346 | (long) GET_THREAD (ptid), | |
b4acd559 | 1347 | objfile->name, thread_db_err_str (err)); |
3f47be5c EZ |
1348 | else |
1349 | error ("Cannot find thread-local storage for thread %ld, " | |
1350 | "executable file %s:\n%s", | |
1351 | (long) GET_THREAD (ptid), | |
b4acd559 | 1352 | objfile->name, thread_db_err_str (err)); |
3f47be5c EZ |
1353 | } |
1354 | ||
1355 | /* Cast assuming host == target. Joy. */ | |
1356 | return (CORE_ADDR) address; | |
1357 | } | |
1358 | ||
1359 | if (target_beneath->to_get_thread_local_address) | |
b4acd559 JJ |
1360 | return target_beneath->to_get_thread_local_address (ptid, objfile, |
1361 | offset); | |
3f47be5c EZ |
1362 | |
1363 | error ("Cannot find thread-local values on this target."); | |
1364 | } | |
1365 | ||
fb0e1ba7 MK |
1366 | static void |
1367 | init_thread_db_ops (void) | |
1368 | { | |
1369 | thread_db_ops.to_shortname = "multi-thread"; | |
1370 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1371 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
c194fbe1 | 1372 | thread_db_ops.to_attach = thread_db_attach; |
fb0e1ba7 MK |
1373 | thread_db_ops.to_detach = thread_db_detach; |
1374 | thread_db_ops.to_resume = thread_db_resume; | |
1375 | thread_db_ops.to_wait = thread_db_wait; | |
1376 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1377 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
1378 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
1379 | thread_db_ops.to_kill = thread_db_kill; | |
1380 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1381 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1382 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1383 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1384 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1385 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1386 | thread_db_ops.to_stratum = thread_stratum; | |
1387 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1388 | thread_db_ops.to_get_thread_local_address |
1389 | = thread_db_get_thread_local_address; | |
fb0e1ba7 MK |
1390 | thread_db_ops.to_magic = OPS_MAGIC; |
1391 | } | |
1392 | ||
1393 | void | |
1394 | _initialize_thread_db (void) | |
1395 | { | |
1396 | /* Only initialize the module if we can load libthread_db. */ | |
1397 | if (thread_db_load ()) | |
1398 | { | |
1399 | init_thread_db_ops (); | |
1400 | add_target (&thread_db_ops); | |
1401 | ||
1402 | /* Add ourselves to objfile event chain. */ | |
9a4105ab AC |
1403 | target_new_objfile_chain = deprecated_target_new_objfile_hook; |
1404 | deprecated_target_new_objfile_hook = thread_db_new_objfile; | |
fb0e1ba7 MK |
1405 | } |
1406 | } |