Commit | Line | Data |
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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
a0841d7a | 3 | Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006 |
10d6c8cd | 4 | Free Software Foundation, Inc. |
fb0e1ba7 MK |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
fb0e1ba7 MK |
22 | |
23 | #include "defs.h" | |
24 | ||
25 | #include "gdb_assert.h" | |
26 | #include <dlfcn.h> | |
27 | #include "gdb_proc_service.h" | |
28 | #include "gdb_thread_db.h" | |
29 | ||
bda9cb72 | 30 | #include "bfd.h" |
93ad78a7 | 31 | #include "exceptions.h" |
fb0e1ba7 MK |
32 | #include "gdbthread.h" |
33 | #include "inferior.h" | |
bda9cb72 MK |
34 | #include "symfile.h" |
35 | #include "objfiles.h" | |
fb0e1ba7 | 36 | #include "target.h" |
4e052eda | 37 | #include "regcache.h" |
3f47be5c | 38 | #include "solib-svr4.h" |
16451949 | 39 | #include "gdbcore.h" |
fb0e1ba7 | 40 | |
a2f23071 DJ |
41 | #ifdef HAVE_GNU_LIBC_VERSION_H |
42 | #include <gnu/libc-version.h> | |
43 | #endif | |
44 | ||
fb0e1ba7 MK |
45 | #ifndef LIBTHREAD_DB_SO |
46 | #define LIBTHREAD_DB_SO "libthread_db.so.1" | |
47 | #endif | |
48 | ||
8605d56e AC |
49 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
50 | threads. */ | |
fb0e1ba7 MK |
51 | |
52 | /* FIXME: There is certainly some room for improvements: | |
53 | - Cache LWP ids. | |
54 | - Bypass libthread_db when fetching or storing registers for | |
55 | threads bound to a LWP. */ | |
56 | ||
57 | /* This module's target vector. */ | |
58 | static struct target_ops thread_db_ops; | |
59 | ||
60 | /* The target vector that we call for things this module can't handle. */ | |
61 | static struct target_ops *target_beneath; | |
62 | ||
63 | /* Pointer to the next function on the objfile event chain. */ | |
b4acd559 | 64 | static void (*target_new_objfile_chain) (struct objfile * objfile); |
fb0e1ba7 MK |
65 | |
66 | /* Non-zero if we're using this module's target vector. */ | |
67 | static int using_thread_db; | |
68 | ||
69 | /* Non-zero if we have determined the signals used by the threads | |
70 | library. */ | |
71 | static int thread_signals; | |
72 | static sigset_t thread_stop_set; | |
73 | static sigset_t thread_print_set; | |
74 | ||
75 | /* Structure that identifies the child process for the | |
76 | <proc_service.h> interface. */ | |
77 | static struct ps_prochandle proc_handle; | |
78 | ||
79 | /* Connection to the libthread_db library. */ | |
80 | static td_thragent_t *thread_agent; | |
81 | ||
82 | /* Pointers to the libthread_db functions. */ | |
83 | ||
84 | static td_err_e (*td_init_p) (void); | |
85 | ||
b4acd559 JJ |
86 | static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
87 | td_thragent_t **ta); | |
fb0e1ba7 MK |
88 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
89 | td_thrhandle_t *__th); | |
b4acd559 JJ |
90 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, |
91 | lwpid_t lwpid, td_thrhandle_t *th); | |
fb0e1ba7 | 92 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, |
b4acd559 JJ |
93 | td_thr_iter_f *callback, void *cbdata_p, |
94 | td_thr_state_e state, int ti_pri, | |
95 | sigset_t *ti_sigmask_p, | |
fb0e1ba7 MK |
96 | unsigned int ti_user_flags); |
97 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
98 | td_event_e event, td_notify_t *ptr); | |
99 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
100 | td_thr_events_t *event); | |
101 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
102 | td_event_msg_t *msg); | |
103 | ||
104 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
105 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
106 | td_thrinfo_t *infop); | |
107 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
108 | gdb_prfpregset_t *regset); | |
109 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
110 | prgregset_t gregs); | |
111 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
112 | const gdb_prfpregset_t *fpregs); | |
113 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
114 | prgregset_t gregs); | |
b4acd559 JJ |
115 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, |
116 | int event); | |
fb0e1ba7 | 117 | |
3f47be5c | 118 | static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
b4acd559 JJ |
119 | void *map_address, |
120 | size_t offset, void **address); | |
3f47be5c | 121 | |
fb0e1ba7 MK |
122 | /* Location of the thread creation event breakpoint. The code at this |
123 | location in the child process will be called by the pthread library | |
124 | whenever a new thread is created. By setting a special breakpoint | |
125 | at this location, GDB can detect when a new thread is created. We | |
126 | obtain this location via the td_ta_event_addr call. */ | |
127 | static CORE_ADDR td_create_bp_addr; | |
128 | ||
129 | /* Location of the thread death event breakpoint. */ | |
130 | static CORE_ADDR td_death_bp_addr; | |
131 | ||
132 | /* Prototypes for local functions. */ | |
bda9cb72 | 133 | static void thread_db_find_new_threads (void); |
5365276c DJ |
134 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
135 | const td_thrinfo_t *ti_p, int verbose); | |
a2f23071 | 136 | static void detach_thread (ptid_t ptid, int verbose); |
fb0e1ba7 MK |
137 | \f |
138 | ||
139 | /* Building process ids. */ | |
140 | ||
ca6724c1 KB |
141 | #define GET_PID(ptid) ptid_get_pid (ptid) |
142 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
143 | #define GET_THREAD(ptid) ptid_get_tid (ptid) | |
fb0e1ba7 | 144 | |
ca6724c1 KB |
145 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) |
146 | #define is_thread(ptid) (GET_THREAD (ptid) != 0) | |
fb0e1ba7 | 147 | |
ca6724c1 | 148 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) |
fb0e1ba7 MK |
149 | \f |
150 | ||
5365276c DJ |
151 | /* Use "struct private_thread_info" to cache thread state. This is |
152 | a substantial optimization. */ | |
153 | ||
fb0e1ba7 MK |
154 | struct private_thread_info |
155 | { | |
a2f23071 DJ |
156 | /* Flag set when we see a TD_DEATH event for this thread. */ |
157 | unsigned int dying:1; | |
158 | ||
5365276c | 159 | /* Cached thread state. */ |
b4acd559 JJ |
160 | unsigned int th_valid:1; |
161 | unsigned int ti_valid:1; | |
5365276c DJ |
162 | |
163 | td_thrhandle_t th; | |
164 | td_thrinfo_t ti; | |
fb0e1ba7 | 165 | }; |
fb0e1ba7 | 166 | \f |
21bf60fe | 167 | |
fb0e1ba7 MK |
168 | static char * |
169 | thread_db_err_str (td_err_e err) | |
170 | { | |
171 | static char buf[64]; | |
172 | ||
173 | switch (err) | |
174 | { | |
175 | case TD_OK: | |
176 | return "generic 'call succeeded'"; | |
177 | case TD_ERR: | |
178 | return "generic error"; | |
179 | case TD_NOTHR: | |
180 | return "no thread to satisfy query"; | |
181 | case TD_NOSV: | |
182 | return "no sync handle to satisfy query"; | |
183 | case TD_NOLWP: | |
184 | return "no LWP to satisfy query"; | |
185 | case TD_BADPH: | |
186 | return "invalid process handle"; | |
187 | case TD_BADTH: | |
188 | return "invalid thread handle"; | |
189 | case TD_BADSH: | |
190 | return "invalid synchronization handle"; | |
191 | case TD_BADTA: | |
192 | return "invalid thread agent"; | |
193 | case TD_BADKEY: | |
194 | return "invalid key"; | |
195 | case TD_NOMSG: | |
196 | return "no event message for getmsg"; | |
197 | case TD_NOFPREGS: | |
198 | return "FPU register set not available"; | |
199 | case TD_NOLIBTHREAD: | |
200 | return "application not linked with libthread"; | |
201 | case TD_NOEVENT: | |
202 | return "requested event is not supported"; | |
203 | case TD_NOCAPAB: | |
204 | return "capability not available"; | |
205 | case TD_DBERR: | |
206 | return "debugger service failed"; | |
207 | case TD_NOAPLIC: | |
208 | return "operation not applicable to"; | |
209 | case TD_NOTSD: | |
210 | return "no thread-specific data for this thread"; | |
211 | case TD_MALLOC: | |
212 | return "malloc failed"; | |
213 | case TD_PARTIALREG: | |
214 | return "only part of register set was written/read"; | |
215 | case TD_NOXREGS: | |
216 | return "X register set not available for this thread"; | |
217 | default: | |
218 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
219 | return buf; | |
220 | } | |
221 | } | |
222 | ||
223 | static char * | |
224 | thread_db_state_str (td_thr_state_e state) | |
225 | { | |
226 | static char buf[64]; | |
227 | ||
228 | switch (state) | |
229 | { | |
230 | case TD_THR_STOPPED: | |
231 | return "stopped by debugger"; | |
232 | case TD_THR_RUN: | |
233 | return "runnable"; | |
234 | case TD_THR_ACTIVE: | |
235 | return "active"; | |
236 | case TD_THR_ZOMBIE: | |
237 | return "zombie"; | |
238 | case TD_THR_SLEEP: | |
239 | return "sleeping"; | |
240 | case TD_THR_STOPPED_ASLEEP: | |
241 | return "stopped by debugger AND blocked"; | |
242 | default: | |
243 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
244 | return buf; | |
245 | } | |
246 | } | |
247 | \f | |
5365276c | 248 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 249 | threads to LWPs. |
5365276c DJ |
250 | |
251 | THP is a handle to the current thread; if INFOP is not NULL, the | |
252 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
253 | *INFOP. |
254 | ||
255 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
256 | zero is returned to indicate success. */ | |
5365276c DJ |
257 | |
258 | static int | |
259 | thread_get_info_callback (const td_thrhandle_t *thp, void *infop) | |
260 | { | |
261 | td_thrinfo_t ti; | |
262 | td_err_e err; | |
263 | struct thread_info *thread_info; | |
264 | ptid_t thread_ptid; | |
265 | ||
266 | err = td_thr_get_info_p (thp, &ti); | |
267 | if (err != TD_OK) | |
8a3fe4f8 | 268 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
269 | thread_db_err_str (err)); |
270 | ||
271 | /* Fill the cache. */ | |
1bac0d4d | 272 | thread_ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid); |
5365276c DJ |
273 | thread_info = find_thread_pid (thread_ptid); |
274 | ||
b9b5d7ea | 275 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 276 | attach to it thinking it is a new thread. */ |
b9b5d7ea JJ |
277 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
278 | { | |
279 | if (infop != NULL) | |
280 | *(struct thread_info **) infop = thread_info; | |
f90ef764 JJ |
281 | if (thread_info != NULL) |
282 | { | |
283 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
284 | thread_info->private->th_valid = 1; | |
285 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
286 | thread_info->private->ti_valid = 1; | |
287 | } | |
b9b5d7ea JJ |
288 | return TD_THR_ZOMBIE; |
289 | } | |
290 | ||
5365276c DJ |
291 | if (thread_info == NULL) |
292 | { | |
293 | /* New thread. Attach to it now (why wait?). */ | |
294 | attach_thread (thread_ptid, thp, &ti, 1); | |
295 | thread_info = find_thread_pid (thread_ptid); | |
296 | gdb_assert (thread_info != NULL); | |
297 | } | |
298 | ||
299 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
300 | thread_info->private->th_valid = 1; | |
301 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
302 | thread_info->private->ti_valid = 1; | |
303 | ||
304 | if (infop != NULL) | |
305 | *(struct thread_info **) infop = thread_info; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | /* Accessor functions for the thread_db information, with caching. */ | |
fb0e1ba7 | 311 | |
5365276c DJ |
312 | static void |
313 | thread_db_map_id2thr (struct thread_info *thread_info, int fatal) | |
314 | { | |
315 | td_err_e err; | |
316 | ||
317 | if (thread_info->private->th_valid) | |
318 | return; | |
319 | ||
320 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid), | |
321 | &thread_info->private->th); | |
322 | if (err != TD_OK) | |
323 | { | |
324 | if (fatal) | |
8a3fe4f8 | 325 | error (_("Cannot find thread %ld: %s"), |
b4acd559 JJ |
326 | (long) GET_THREAD (thread_info->ptid), |
327 | thread_db_err_str (err)); | |
5365276c DJ |
328 | } |
329 | else | |
330 | thread_info->private->th_valid = 1; | |
331 | } | |
332 | ||
333 | static td_thrinfo_t * | |
334 | thread_db_get_info (struct thread_info *thread_info) | |
335 | { | |
336 | td_err_e err; | |
337 | ||
338 | if (thread_info->private->ti_valid) | |
339 | return &thread_info->private->ti; | |
340 | ||
b4acd559 | 341 | if (!thread_info->private->th_valid) |
5365276c DJ |
342 | thread_db_map_id2thr (thread_info, 1); |
343 | ||
b4acd559 JJ |
344 | err = |
345 | td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti); | |
5365276c | 346 | if (err != TD_OK) |
8a3fe4f8 | 347 | error (_("thread_db_get_info: cannot get thread info: %s"), |
5365276c DJ |
348 | thread_db_err_str (err)); |
349 | ||
350 | thread_info->private->ti_valid = 1; | |
351 | return &thread_info->private->ti; | |
352 | } | |
353 | \f | |
fb0e1ba7 MK |
354 | /* Convert between user-level thread ids and LWP ids. */ |
355 | ||
39f77062 KB |
356 | static ptid_t |
357 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 358 | { |
fb0e1ba7 MK |
359 | td_thrhandle_t th; |
360 | td_err_e err; | |
5365276c DJ |
361 | struct thread_info *thread_info; |
362 | ptid_t thread_ptid; | |
fb0e1ba7 | 363 | |
39f77062 KB |
364 | if (GET_LWP (ptid) == 0) |
365 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); | |
fb0e1ba7 | 366 | |
39f77062 | 367 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 368 | |
39f77062 | 369 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
fb0e1ba7 | 370 | if (err != TD_OK) |
8a3fe4f8 | 371 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 372 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 373 | |
5365276c | 374 | thread_info = NULL; |
b9b5d7ea JJ |
375 | |
376 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the | |
377 | event thread has already died. If another gdb interface has called | |
378 | thread_alive() previously, the thread won't be found on the thread list | |
379 | anymore. In that case, we don't want to process this ptid anymore | |
380 | to avoid the possibility of later treating it as a newly | |
381 | discovered thread id that we should add to the list. Thus, | |
382 | we return a -1 ptid which is also how the thread list marks a | |
383 | dead thread. */ | |
384 | if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE | |
385 | && thread_info == NULL) | |
386 | return pid_to_ptid (-1); | |
387 | ||
5365276c | 388 | gdb_assert (thread_info && thread_info->private->ti_valid); |
fb0e1ba7 | 389 | |
1bac0d4d DJ |
390 | return ptid_build (GET_PID (ptid), GET_LWP (ptid), |
391 | thread_info->private->ti.ti_tid); | |
fb0e1ba7 MK |
392 | } |
393 | ||
39f77062 KB |
394 | static ptid_t |
395 | lwp_from_thread (ptid_t ptid) | |
fb0e1ba7 | 396 | { |
1bac0d4d | 397 | return BUILD_LWP (GET_LWP (ptid), GET_PID (ptid)); |
fb0e1ba7 MK |
398 | } |
399 | \f | |
400 | ||
401 | void | |
402 | thread_db_init (struct target_ops *target) | |
403 | { | |
404 | target_beneath = target; | |
405 | } | |
406 | ||
5220ea4c AC |
407 | static void * |
408 | verbose_dlsym (void *handle, const char *name) | |
409 | { | |
410 | void *sym = dlsym (handle, name); | |
411 | if (sym == NULL) | |
8a3fe4f8 | 412 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ()); |
5220ea4c AC |
413 | return sym; |
414 | } | |
415 | ||
fb0e1ba7 MK |
416 | static int |
417 | thread_db_load (void) | |
418 | { | |
419 | void *handle; | |
420 | td_err_e err; | |
421 | ||
422 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
423 | if (handle == NULL) | |
f7c1e0f3 | 424 | { |
b4acd559 | 425 | fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
f7c1e0f3 | 426 | LIBTHREAD_DB_SO, dlerror ()); |
b4acd559 | 427 | fprintf_filtered (gdb_stderr, |
f7c1e0f3 MS |
428 | "GDB will not be able to debug pthreads.\n\n"); |
429 | return 0; | |
430 | } | |
fb0e1ba7 MK |
431 | |
432 | /* Initialize pointers to the dynamic library functions we will use. | |
433 | Essential functions first. */ | |
434 | ||
5220ea4c | 435 | td_init_p = verbose_dlsym (handle, "td_init"); |
fb0e1ba7 MK |
436 | if (td_init_p == NULL) |
437 | return 0; | |
438 | ||
5220ea4c | 439 | td_ta_new_p = verbose_dlsym (handle, "td_ta_new"); |
fb0e1ba7 MK |
440 | if (td_ta_new_p == NULL) |
441 | return 0; | |
442 | ||
5220ea4c | 443 | td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr"); |
fb0e1ba7 MK |
444 | if (td_ta_map_id2thr_p == NULL) |
445 | return 0; | |
446 | ||
5220ea4c | 447 | td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr"); |
fb0e1ba7 MK |
448 | if (td_ta_map_lwp2thr_p == NULL) |
449 | return 0; | |
450 | ||
5220ea4c | 451 | td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter"); |
fb0e1ba7 MK |
452 | if (td_ta_thr_iter_p == NULL) |
453 | return 0; | |
454 | ||
5220ea4c | 455 | td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate"); |
fb0e1ba7 MK |
456 | if (td_thr_validate_p == NULL) |
457 | return 0; | |
458 | ||
5220ea4c | 459 | td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info"); |
fb0e1ba7 MK |
460 | if (td_thr_get_info_p == NULL) |
461 | return 0; | |
462 | ||
5220ea4c | 463 | td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs"); |
fb0e1ba7 MK |
464 | if (td_thr_getfpregs_p == NULL) |
465 | return 0; | |
466 | ||
5220ea4c | 467 | td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs"); |
fb0e1ba7 MK |
468 | if (td_thr_getgregs_p == NULL) |
469 | return 0; | |
470 | ||
5220ea4c | 471 | td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs"); |
fb0e1ba7 MK |
472 | if (td_thr_setfpregs_p == NULL) |
473 | return 0; | |
474 | ||
5220ea4c | 475 | td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs"); |
fb0e1ba7 MK |
476 | if (td_thr_setgregs_p == NULL) |
477 | return 0; | |
478 | ||
479 | /* Initialize the library. */ | |
480 | err = td_init_p (); | |
481 | if (err != TD_OK) | |
482 | { | |
8a3fe4f8 | 483 | warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err)); |
fb0e1ba7 MK |
484 | return 0; |
485 | } | |
486 | ||
487 | /* These are not essential. */ | |
488 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
489 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
490 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
491 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
3f47be5c | 492 | td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
fb0e1ba7 MK |
493 | |
494 | return 1; | |
495 | } | |
496 | ||
cdbc0b18 | 497 | static td_err_e |
24557e30 AC |
498 | enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp) |
499 | { | |
500 | td_notify_t notify; | |
cdbc0b18 | 501 | td_err_e err; |
24557e30 AC |
502 | |
503 | /* Get the breakpoint address for thread EVENT. */ | |
504 | err = td_ta_event_addr_p (thread_agent, event, ¬ify); | |
505 | if (err != TD_OK) | |
cdbc0b18 | 506 | return err; |
24557e30 AC |
507 | |
508 | /* Set up the breakpoint. */ | |
16451949 AS |
509 | gdb_assert (exec_bfd); |
510 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
511 | (current_gdbarch, | |
512 | /* Do proper sign extension for the target. */ | |
513 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
514 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
515 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
516 | ¤t_target)); | |
24557e30 AC |
517 | create_thread_event_breakpoint ((*bp)); |
518 | ||
cdbc0b18 | 519 | return TD_OK; |
24557e30 AC |
520 | } |
521 | ||
fb0e1ba7 MK |
522 | static void |
523 | enable_thread_event_reporting (void) | |
524 | { | |
525 | td_thr_events_t events; | |
526 | td_notify_t notify; | |
527 | td_err_e err; | |
a2f23071 DJ |
528 | #ifdef HAVE_GNU_LIBC_VERSION_H |
529 | const char *libc_version; | |
530 | int libc_major, libc_minor; | |
531 | #endif | |
fb0e1ba7 MK |
532 | |
533 | /* We cannot use the thread event reporting facility if these | |
534 | functions aren't available. */ | |
535 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
536 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
537 | return; | |
538 | ||
539 | /* Set the process wide mask saying which events we're interested in. */ | |
540 | td_event_emptyset (&events); | |
541 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
542 | |
543 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
fb0e1ba7 MK |
544 | /* FIXME: kettenis/2000-04-23: The event reporting facility is |
545 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
546 | now. */ | |
a2f23071 DJ |
547 | libc_version = gnu_get_libc_version (); |
548 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
549 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 550 | #endif |
a2f23071 | 551 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 MK |
552 | |
553 | err = td_ta_set_event_p (thread_agent, &events); | |
554 | if (err != TD_OK) | |
555 | { | |
8a3fe4f8 | 556 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
557 | thread_db_err_str (err)); |
558 | return; | |
559 | } | |
560 | ||
561 | /* Delete previous thread event breakpoints, if any. */ | |
562 | remove_thread_event_breakpoints (); | |
24557e30 AC |
563 | td_create_bp_addr = 0; |
564 | td_death_bp_addr = 0; | |
fb0e1ba7 | 565 | |
24557e30 | 566 | /* Set up the thread creation event. */ |
cdbc0b18 RM |
567 | err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr); |
568 | if (err != TD_OK) | |
fb0e1ba7 | 569 | { |
8a3fe4f8 | 570 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
571 | thread_db_err_str (err)); |
572 | return; | |
573 | } | |
574 | ||
24557e30 | 575 | /* Set up the thread death event. */ |
cdbc0b18 RM |
576 | err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr); |
577 | if (err != TD_OK) | |
fb0e1ba7 | 578 | { |
8a3fe4f8 | 579 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
580 | thread_db_err_str (err)); |
581 | return; | |
582 | } | |
fb0e1ba7 MK |
583 | } |
584 | ||
585 | static void | |
586 | disable_thread_event_reporting (void) | |
587 | { | |
588 | td_thr_events_t events; | |
589 | ||
590 | /* Set the process wide mask saying we aren't interested in any | |
591 | events anymore. */ | |
592 | td_event_emptyset (&events); | |
593 | td_ta_set_event_p (thread_agent, &events); | |
594 | ||
595 | /* Delete thread event breakpoints, if any. */ | |
596 | remove_thread_event_breakpoints (); | |
597 | td_create_bp_addr = 0; | |
598 | td_death_bp_addr = 0; | |
599 | } | |
600 | ||
601 | static void | |
602 | check_thread_signals (void) | |
603 | { | |
604 | #ifdef GET_THREAD_SIGNALS | |
21bf60fe | 605 | if (!thread_signals) |
fb0e1ba7 MK |
606 | { |
607 | sigset_t mask; | |
608 | int i; | |
609 | ||
610 | GET_THREAD_SIGNALS (&mask); | |
611 | sigemptyset (&thread_stop_set); | |
612 | sigemptyset (&thread_print_set); | |
613 | ||
b9569773 | 614 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
615 | { |
616 | if (sigismember (&mask, i)) | |
617 | { | |
618 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
619 | sigaddset (&thread_stop_set, i); | |
620 | if (signal_print_update (target_signal_from_host (i), 0)) | |
621 | sigaddset (&thread_print_set, i); | |
622 | thread_signals = 1; | |
623 | } | |
624 | } | |
625 | } | |
626 | #endif | |
627 | } | |
628 | ||
fb0e1ba7 MK |
629 | static void |
630 | thread_db_new_objfile (struct objfile *objfile) | |
631 | { | |
632 | td_err_e err; | |
633 | ||
5220ea4c AC |
634 | /* First time through, report that libthread_db was successfuly |
635 | loaded. Can't print this in in thread_db_load as, at that stage, | |
636 | the interpreter and it's console haven't started. The real | |
637 | problem here is that libthread_db is loaded too early - it should | |
638 | only be loaded when there is a program to debug. */ | |
639 | { | |
640 | static int dejavu; | |
641 | if (!dejavu) | |
642 | { | |
643 | Dl_info info; | |
644 | const char *library = NULL; | |
645 | /* Try dladdr. */ | |
646 | if (dladdr ((*td_ta_new_p), &info) != 0) | |
647 | library = info.dli_fname; | |
648 | /* Try dlinfo? */ | |
649 | if (library == NULL) | |
650 | /* Paranoid - don't let a NULL path slip through. */ | |
651 | library = LIBTHREAD_DB_SO; | |
a3f17187 | 652 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
5220ea4c AC |
653 | library); |
654 | dejavu = 1; | |
655 | } | |
656 | } | |
657 | ||
5bbd998e MS |
658 | /* Don't attempt to use thread_db on targets which can not run |
659 | (core files). */ | |
660 | if (objfile == NULL || !target_has_execution) | |
bda9cb72 MK |
661 | { |
662 | /* All symbols have been discarded. If the thread_db target is | |
c194fbe1 | 663 | active, deactivate it now. */ |
bda9cb72 | 664 | if (using_thread_db) |
c194fbe1 MK |
665 | { |
666 | gdb_assert (proc_handle.pid == 0); | |
667 | unpush_target (&thread_db_ops); | |
668 | using_thread_db = 0; | |
669 | } | |
670 | ||
bda9cb72 MK |
671 | goto quit; |
672 | } | |
673 | ||
fb0e1ba7 MK |
674 | if (using_thread_db) |
675 | /* Nothing to do. The thread library was already detected and the | |
676 | target vector was already activated. */ | |
677 | goto quit; | |
678 | ||
bda9cb72 MK |
679 | /* Initialize the structure that identifies the child process. Note |
680 | that at this point there is no guarantee that we actually have a | |
681 | child process. */ | |
39f77062 | 682 | proc_handle.pid = GET_PID (inferior_ptid); |
fb0e1ba7 | 683 | |
bda9cb72 | 684 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
685 | err = td_ta_new_p (&proc_handle, &thread_agent); |
686 | switch (err) | |
687 | { | |
688 | case TD_NOLIBTHREAD: | |
bda9cb72 | 689 | /* No thread library was detected. */ |
fb0e1ba7 MK |
690 | break; |
691 | ||
692 | case TD_OK: | |
a3f17187 | 693 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
5220ea4c | 694 | |
bda9cb72 MK |
695 | /* The thread library was detected. Activate the thread_db target. */ |
696 | push_target (&thread_db_ops); | |
697 | using_thread_db = 1; | |
698 | ||
95575b2e AC |
699 | enable_thread_event_reporting (); |
700 | thread_db_find_new_threads (); | |
fb0e1ba7 MK |
701 | break; |
702 | ||
703 | default: | |
8a3fe4f8 | 704 | warning (_("Cannot initialize thread debugging library: %s"), |
fb0e1ba7 MK |
705 | thread_db_err_str (err)); |
706 | break; | |
707 | } | |
708 | ||
b4acd559 | 709 | quit: |
540af400 MS |
710 | if (target_new_objfile_chain) |
711 | target_new_objfile_chain (objfile); | |
fb0e1ba7 MK |
712 | } |
713 | ||
a2f23071 DJ |
714 | /* Attach to a new thread. This function is called when we receive a |
715 | TD_CREATE event or when we iterate over all threads and find one | |
716 | that wasn't already in our list. */ | |
717 | ||
fb0e1ba7 | 718 | static void |
39f77062 | 719 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
fb0e1ba7 MK |
720 | const td_thrinfo_t *ti_p, int verbose) |
721 | { | |
722 | struct thread_info *tp; | |
723 | td_err_e err; | |
724 | ||
a2f23071 DJ |
725 | /* If we're being called after a TD_CREATE event, we may already |
726 | know about this thread. There are two ways this can happen. We | |
727 | may have iterated over all threads between the thread creation | |
728 | and the TD_CREATE event, for instance when the user has issued | |
729 | the `info threads' command before the SIGTRAP for hitting the | |
730 | thread creation breakpoint was reported. Alternatively, the | |
731 | thread may have exited and a new one been created with the same | |
732 | thread ID. In the first case we don't need to do anything; in | |
733 | the second case we should discard information about the dead | |
734 | thread and attach to the new one. */ | |
735 | if (in_thread_list (ptid)) | |
736 | { | |
737 | tp = find_thread_pid (ptid); | |
738 | gdb_assert (tp != NULL); | |
739 | ||
740 | if (!tp->private->dying) | |
741 | return; | |
742 | ||
743 | delete_thread (ptid); | |
744 | } | |
745 | ||
fb0e1ba7 MK |
746 | check_thread_signals (); |
747 | ||
fb0e1ba7 | 748 | /* Add the thread to GDB's thread list. */ |
39f77062 | 749 | tp = add_thread (ptid); |
fb0e1ba7 | 750 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
5365276c DJ |
751 | memset (tp->private, 0, sizeof (struct private_thread_info)); |
752 | ||
753 | if (verbose) | |
a3f17187 | 754 | printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid)); |
fb0e1ba7 | 755 | |
21bf60fe MK |
756 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
757 | return; /* A zombie thread -- do not attach. */ | |
5fd913cc | 758 | |
8605d56e | 759 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
fb0e1ba7 | 760 | #ifdef ATTACH_LWP |
c194fbe1 | 761 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); |
fb0e1ba7 MK |
762 | #endif |
763 | ||
764 | /* Enable thread event reporting for this thread. */ | |
765 | err = td_thr_event_enable_p (th_p, 1); | |
766 | if (err != TD_OK) | |
8a3fe4f8 | 767 | error (_("Cannot enable thread event reporting for %s: %s"), |
39f77062 | 768 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
769 | } |
770 | ||
c194fbe1 MK |
771 | static void |
772 | thread_db_attach (char *args, int from_tty) | |
773 | { | |
774 | target_beneath->to_attach (args, from_tty); | |
775 | ||
776 | /* Destroy thread info; it's no longer valid. */ | |
777 | init_thread_list (); | |
778 | ||
779 | /* The child process is now the actual multi-threaded | |
780 | program. Snatch its process ID... */ | |
781 | proc_handle.pid = GET_PID (inferior_ptid); | |
782 | ||
783 | /* ...and perform the remaining initialization steps. */ | |
784 | enable_thread_event_reporting (); | |
b4acd559 | 785 | thread_db_find_new_threads (); |
c194fbe1 MK |
786 | } |
787 | ||
fb0e1ba7 | 788 | static void |
39f77062 | 789 | detach_thread (ptid_t ptid, int verbose) |
fb0e1ba7 | 790 | { |
a2f23071 DJ |
791 | struct thread_info *thread_info; |
792 | ||
fb0e1ba7 | 793 | if (verbose) |
a3f17187 | 794 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); |
a2f23071 DJ |
795 | |
796 | /* Don't delete the thread now, because it still reports as active | |
797 | until it has executed a few instructions after the event | |
798 | breakpoint - if we deleted it now, "info threads" would cause us | |
799 | to re-attach to it. Just mark it as having had a TD_DEATH | |
800 | event. This means that we won't delete it from our thread list | |
801 | until we notice that it's dead (via prune_threads), or until | |
802 | something re-uses its thread ID. */ | |
803 | thread_info = find_thread_pid (ptid); | |
804 | gdb_assert (thread_info != NULL); | |
805 | thread_info->private->dying = 1; | |
fb0e1ba7 MK |
806 | } |
807 | ||
808 | static void | |
809 | thread_db_detach (char *args, int from_tty) | |
810 | { | |
811 | disable_thread_event_reporting (); | |
c194fbe1 MK |
812 | |
813 | /* There's no need to save & restore inferior_ptid here, since the | |
814 | inferior is supposed to be survive this function call. */ | |
815 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
816 | ||
817 | /* Forget about the child's process ID. We shouldn't need it | |
818 | anymore. */ | |
819 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
820 | |
821 | target_beneath->to_detach (args, from_tty); | |
822 | } | |
823 | ||
5365276c DJ |
824 | static int |
825 | clear_lwpid_callback (struct thread_info *thread, void *dummy) | |
826 | { | |
827 | /* If we know that our thread implementation is 1-to-1, we could save | |
828 | a certain amount of information; it's not clear how much, so we | |
829 | are always conservative. */ | |
830 | ||
831 | thread->private->th_valid = 0; | |
832 | thread->private->ti_valid = 0; | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
fb0e1ba7 | 837 | static void |
39f77062 | 838 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 | 839 | { |
39f77062 | 840 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 841 | |
39f77062 KB |
842 | if (GET_PID (ptid) == -1) |
843 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
844 | else if (is_thread (ptid)) | |
845 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 846 | |
5365276c DJ |
847 | /* Clear cached data which may not be valid after the resume. */ |
848 | iterate_over_threads (clear_lwpid_callback, NULL); | |
849 | ||
39f77062 | 850 | target_beneath->to_resume (ptid, step, signo); |
fb0e1ba7 MK |
851 | |
852 | do_cleanups (old_chain); | |
853 | } | |
854 | ||
855 | /* Check if PID is currently stopped at the location of a thread event | |
856 | breakpoint location. If it is, read the event message and act upon | |
857 | the event. */ | |
858 | ||
859 | static void | |
39f77062 | 860 | check_event (ptid_t ptid) |
fb0e1ba7 MK |
861 | { |
862 | td_event_msg_t msg; | |
863 | td_thrinfo_t ti; | |
864 | td_err_e err; | |
865 | CORE_ADDR stop_pc; | |
4d9850d3 | 866 | int loop = 0; |
fb0e1ba7 MK |
867 | |
868 | /* Bail out early if we're not at a thread event breakpoint. */ | |
39f77062 | 869 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
fb0e1ba7 MK |
870 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
871 | return; | |
872 | ||
4d9850d3 JJ |
873 | /* If we are at a create breakpoint, we do not know what new lwp |
874 | was created and cannot specifically locate the event message for it. | |
875 | We have to call td_ta_event_getmsg() to get | |
876 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 877 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 878 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
879 | This guarantees we will process the correct message before continuing |
880 | from the breakpoint. | |
4d9850d3 JJ |
881 | |
882 | Currently, death events are not enabled. If they are enabled, | |
883 | the death event can use the td_thr_event_getmsg() interface to | |
884 | get the message specifically for that lwp and avoid looping | |
885 | below. */ | |
886 | ||
887 | loop = 1; | |
888 | ||
889 | do | |
fb0e1ba7 | 890 | { |
4d9850d3 JJ |
891 | err = td_ta_event_getmsg_p (thread_agent, &msg); |
892 | if (err != TD_OK) | |
893 | { | |
894 | if (err == TD_NOMSG) | |
895 | return; | |
fb0e1ba7 | 896 | |
8a3fe4f8 | 897 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
898 | thread_db_err_str (err)); |
899 | } | |
fb0e1ba7 | 900 | |
4d9850d3 JJ |
901 | err = td_thr_get_info_p (msg.th_p, &ti); |
902 | if (err != TD_OK) | |
8a3fe4f8 | 903 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 904 | |
1bac0d4d | 905 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, ti.ti_tid); |
fb0e1ba7 | 906 | |
4d9850d3 JJ |
907 | switch (msg.event) |
908 | { | |
909 | case TD_CREATE: | |
a2f23071 DJ |
910 | /* Call attach_thread whether or not we already know about a |
911 | thread with this thread ID. */ | |
912 | attach_thread (ptid, msg.th_p, &ti, 1); | |
fb0e1ba7 | 913 | |
4d9850d3 | 914 | break; |
fb0e1ba7 | 915 | |
4d9850d3 | 916 | case TD_DEATH: |
fb0e1ba7 | 917 | |
4d9850d3 | 918 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 919 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 920 | |
4d9850d3 | 921 | detach_thread (ptid, 1); |
fb0e1ba7 | 922 | |
4d9850d3 | 923 | break; |
fb0e1ba7 | 924 | |
4d9850d3 | 925 | default: |
8a3fe4f8 | 926 | error (_("Spurious thread event.")); |
4d9850d3 | 927 | } |
fb0e1ba7 | 928 | } |
4d9850d3 | 929 | while (loop); |
fb0e1ba7 MK |
930 | } |
931 | ||
39f77062 KB |
932 | static ptid_t |
933 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 | 934 | { |
39f77062 | 935 | extern ptid_t trap_ptid; |
fb0e1ba7 | 936 | |
39f77062 KB |
937 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
938 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 939 | |
39f77062 | 940 | ptid = target_beneath->to_wait (ptid, ourstatus); |
fb0e1ba7 | 941 | |
bda9cb72 MK |
942 | if (proc_handle.pid == 0) |
943 | /* The current child process isn't the actual multi-threaded | |
944 | program yet, so don't try to do any special thread-specific | |
945 | post-processing and bail out early. */ | |
39f77062 | 946 | return ptid; |
bda9cb72 | 947 | |
fb0e1ba7 | 948 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
39f77062 | 949 | return pid_to_ptid (-1); |
fb0e1ba7 MK |
950 | |
951 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
952 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
953 | /* Check for a thread event. */ | |
39f77062 | 954 | check_event (ptid); |
fb0e1ba7 | 955 | |
39f77062 KB |
956 | if (!ptid_equal (trap_ptid, null_ptid)) |
957 | trap_ptid = thread_from_lwp (trap_ptid); | |
fb0e1ba7 | 958 | |
b9b5d7ea JJ |
959 | /* Change the ptid back into the higher level PID + TID format. |
960 | If the thread is dead and no longer on the thread list, we will | |
961 | get back a dead ptid. This can occur if the thread death event | |
962 | gets postponed by other simultaneous events. In such a case, | |
963 | we want to just ignore the event and continue on. */ | |
964 | ptid = thread_from_lwp (ptid); | |
965 | if (GET_PID (ptid) == -1) | |
966 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
967 | ||
968 | return ptid; | |
fb0e1ba7 MK |
969 | } |
970 | ||
10d6c8cd DJ |
971 | static LONGEST |
972 | thread_db_xfer_partial (struct target_ops *ops, enum target_object object, | |
973 | const char *annex, gdb_byte *readbuf, | |
974 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
fb0e1ba7 | 975 | { |
39f77062 | 976 | struct cleanup *old_chain = save_inferior_ptid (); |
10d6c8cd | 977 | LONGEST xfer; |
fb0e1ba7 | 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 | ||
10d6c8cd DJ |
989 | xfer = target_beneath->to_xfer_partial (ops, object, annex, |
990 | readbuf, writebuf, offset, len); | |
fb0e1ba7 MK |
991 | |
992 | do_cleanups (old_chain); | |
993 | return xfer; | |
994 | } | |
995 | ||
996 | static void | |
997 | thread_db_fetch_registers (int regno) | |
998 | { | |
5365276c | 999 | struct thread_info *thread_info; |
fb0e1ba7 MK |
1000 | prgregset_t gregset; |
1001 | gdb_prfpregset_t fpregset; | |
1002 | td_err_e err; | |
1003 | ||
21bf60fe | 1004 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
1005 | { |
1006 | /* Pass the request to the target beneath us. */ | |
1007 | target_beneath->to_fetch_registers (regno); | |
1008 | return; | |
1009 | } | |
1010 | ||
5365276c DJ |
1011 | thread_info = find_thread_pid (inferior_ptid); |
1012 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 | 1013 | |
5365276c | 1014 | err = td_thr_getgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 | 1015 | if (err != TD_OK) |
8a3fe4f8 | 1016 | error (_("Cannot fetch general-purpose registers for thread %ld: %s"), |
39f77062 | 1017 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 | 1018 | |
5365276c | 1019 | err = td_thr_getfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 | 1020 | if (err != TD_OK) |
8a3fe4f8 | 1021 | error (_("Cannot get floating-point registers for thread %ld: %s"), |
39f77062 | 1022 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1023 | |
1024 | /* Note that we must call supply_gregset after calling the thread_db | |
1025 | routines because the thread_db routines call ps_lgetgregs and | |
1026 | friends which clobber GDB's register cache. */ | |
1027 | supply_gregset ((gdb_gregset_t *) gregset); | |
1028 | supply_fpregset (&fpregset); | |
1029 | } | |
1030 | ||
1031 | static void | |
1032 | thread_db_store_registers (int regno) | |
1033 | { | |
fb0e1ba7 MK |
1034 | prgregset_t gregset; |
1035 | gdb_prfpregset_t fpregset; | |
1036 | td_err_e err; | |
5365276c | 1037 | struct thread_info *thread_info; |
fb0e1ba7 | 1038 | |
21bf60fe | 1039 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
1040 | { |
1041 | /* Pass the request to the target beneath us. */ | |
1042 | target_beneath->to_store_registers (regno); | |
1043 | return; | |
1044 | } | |
1045 | ||
5365276c DJ |
1046 | thread_info = find_thread_pid (inferior_ptid); |
1047 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 MK |
1048 | |
1049 | if (regno != -1) | |
1050 | { | |
a0841d7a | 1051 | gdb_byte raw[MAX_REGISTER_SIZE]; |
fb0e1ba7 | 1052 | |
4caf0990 | 1053 | deprecated_read_register_gen (regno, raw); |
fb0e1ba7 | 1054 | thread_db_fetch_registers (-1); |
23a6d369 | 1055 | regcache_raw_supply (current_regcache, regno, raw); |
fb0e1ba7 MK |
1056 | } |
1057 | ||
1058 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
1059 | fill_fpregset (&fpregset, -1); | |
1060 | ||
5365276c | 1061 | err = td_thr_setgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 | 1062 | if (err != TD_OK) |
8a3fe4f8 | 1063 | error (_("Cannot store general-purpose registers for thread %ld: %s"), |
39f77062 | 1064 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
5365276c | 1065 | err = td_thr_setfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 | 1066 | if (err != TD_OK) |
8a3fe4f8 | 1067 | error (_("Cannot store floating-point registers for thread %ld: %s"), |
39f77062 | 1068 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1069 | } |
1070 | ||
1071 | static void | |
1072 | thread_db_kill (void) | |
1073 | { | |
c194fbe1 MK |
1074 | /* There's no need to save & restore inferior_ptid here, since the |
1075 | inferior isn't supposed to survive this function call. */ | |
1076 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
fb0e1ba7 MK |
1077 | target_beneath->to_kill (); |
1078 | } | |
1079 | ||
1080 | static void | |
c27cda74 AC |
1081 | thread_db_create_inferior (char *exec_file, char *allargs, char **env, |
1082 | int from_tty) | |
fb0e1ba7 | 1083 | { |
b26a6851 AC |
1084 | unpush_target (&thread_db_ops); |
1085 | using_thread_db = 0; | |
c27cda74 | 1086 | target_beneath->to_create_inferior (exec_file, allargs, env, from_tty); |
bda9cb72 | 1087 | } |
fb0e1ba7 | 1088 | |
bda9cb72 | 1089 | static void |
39f77062 | 1090 | thread_db_post_startup_inferior (ptid_t ptid) |
bda9cb72 MK |
1091 | { |
1092 | if (proc_handle.pid == 0) | |
1093 | { | |
1094 | /* The child process is now the actual multi-threaded | |
1095 | program. Snatch its process ID... */ | |
39f77062 | 1096 | proc_handle.pid = GET_PID (ptid); |
fb0e1ba7 | 1097 | |
bda9cb72 MK |
1098 | /* ...and perform the remaining initialization steps. */ |
1099 | enable_thread_event_reporting (); | |
21bf60fe | 1100 | thread_db_find_new_threads (); |
bda9cb72 | 1101 | } |
fb0e1ba7 MK |
1102 | } |
1103 | ||
1104 | static void | |
1105 | thread_db_mourn_inferior (void) | |
1106 | { | |
c194fbe1 MK |
1107 | /* Forget about the child's process ID. We shouldn't need it |
1108 | anymore. */ | |
1109 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
1110 | |
1111 | target_beneath->to_mourn_inferior (); | |
043b2f77 | 1112 | |
e23fc6de DJ |
1113 | /* Delete the old thread event breakpoints. Do this after mourning |
1114 | the inferior, so that we don't try to uninsert them. */ | |
1115 | remove_thread_event_breakpoints (); | |
1116 | ||
b26a6851 AC |
1117 | /* Detach thread_db target ops. */ |
1118 | unpush_target (&thread_db_ops); | |
1119 | using_thread_db = 0; | |
fb0e1ba7 MK |
1120 | } |
1121 | ||
1122 | static int | |
39f77062 | 1123 | thread_db_thread_alive (ptid_t ptid) |
fb0e1ba7 | 1124 | { |
5fd913cc | 1125 | td_thrhandle_t th; |
21bf60fe | 1126 | td_err_e err; |
5fd913cc | 1127 | |
39f77062 | 1128 | if (is_thread (ptid)) |
fb0e1ba7 | 1129 | { |
5365276c DJ |
1130 | struct thread_info *thread_info; |
1131 | thread_info = find_thread_pid (ptid); | |
fb0e1ba7 | 1132 | |
5365276c | 1133 | thread_db_map_id2thr (thread_info, 0); |
b4acd559 | 1134 | if (!thread_info->private->th_valid) |
fb0e1ba7 MK |
1135 | return 0; |
1136 | ||
5365276c | 1137 | err = td_thr_validate_p (&thread_info->private->th); |
5fd913cc MS |
1138 | if (err != TD_OK) |
1139 | return 0; | |
1140 | ||
b4acd559 | 1141 | if (!thread_info->private->ti_valid) |
5365276c | 1142 | { |
b4acd559 JJ |
1143 | err = |
1144 | td_thr_get_info_p (&thread_info->private->th, | |
1145 | &thread_info->private->ti); | |
5365276c DJ |
1146 | if (err != TD_OK) |
1147 | return 0; | |
1148 | thread_info->private->ti_valid = 1; | |
1149 | } | |
1150 | ||
1151 | if (thread_info->private->ti.ti_state == TD_THR_UNKNOWN | |
1152 | || thread_info->private->ti.ti_state == TD_THR_ZOMBIE) | |
21bf60fe | 1153 | return 0; /* A zombie thread. */ |
5fd913cc | 1154 | |
fb0e1ba7 MK |
1155 | return 1; |
1156 | } | |
1157 | ||
1158 | if (target_beneath->to_thread_alive) | |
39f77062 | 1159 | return target_beneath->to_thread_alive (ptid); |
fb0e1ba7 MK |
1160 | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static int | |
1165 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1166 | { | |
1167 | td_thrinfo_t ti; | |
1168 | td_err_e err; | |
39f77062 | 1169 | ptid_t ptid; |
fb0e1ba7 MK |
1170 | |
1171 | err = td_thr_get_info_p (th_p, &ti); | |
1172 | if (err != TD_OK) | |
8a3fe4f8 | 1173 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1174 | thread_db_err_str (err)); |
fb0e1ba7 | 1175 | |
21bf60fe MK |
1176 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1177 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1178 | |
1bac0d4d | 1179 | ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid); |
fb0e1ba7 | 1180 | |
21bf60fe | 1181 | if (!in_thread_list (ptid)) |
39f77062 | 1182 | attach_thread (ptid, th_p, &ti, 1); |
fb0e1ba7 MK |
1183 | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static void | |
1188 | thread_db_find_new_threads (void) | |
1189 | { | |
1190 | td_err_e err; | |
1191 | ||
1192 | /* Iterate over all user-space threads to discover new threads. */ | |
1193 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
1194 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
1195 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
1196 | if (err != TD_OK) | |
8a3fe4f8 | 1197 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); |
fb0e1ba7 MK |
1198 | } |
1199 | ||
1200 | static char * | |
39f77062 | 1201 | thread_db_pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1202 | { |
39f77062 | 1203 | if (is_thread (ptid)) |
fb0e1ba7 MK |
1204 | { |
1205 | static char buf[64]; | |
5365276c | 1206 | td_thrinfo_t *ti_p; |
fb0e1ba7 | 1207 | td_err_e err; |
5365276c | 1208 | struct thread_info *thread_info; |
fb0e1ba7 | 1209 | |
5365276c DJ |
1210 | thread_info = find_thread_pid (ptid); |
1211 | thread_db_map_id2thr (thread_info, 0); | |
b4acd559 | 1212 | if (!thread_info->private->th_valid) |
5365276c | 1213 | { |
b4acd559 JJ |
1214 | snprintf (buf, sizeof (buf), "Thread %ld (Missing)", |
1215 | GET_THREAD (ptid)); | |
5365276c DJ |
1216 | return buf; |
1217 | } | |
fb0e1ba7 | 1218 | |
5365276c | 1219 | ti_p = thread_db_get_info (thread_info); |
fb0e1ba7 | 1220 | |
5365276c | 1221 | if (ti_p->ti_state == TD_THR_ACTIVE && ti_p->ti_lid != 0) |
fb0e1ba7 MK |
1222 | { |
1223 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
5365276c | 1224 | (long) ti_p->ti_tid, ti_p->ti_lid); |
fb0e1ba7 MK |
1225 | } |
1226 | else | |
1227 | { | |
1228 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
b4acd559 JJ |
1229 | (long) ti_p->ti_tid, |
1230 | thread_db_state_str (ti_p->ti_state)); | |
fb0e1ba7 MK |
1231 | } |
1232 | ||
1233 | return buf; | |
1234 | } | |
1235 | ||
39f77062 KB |
1236 | if (target_beneath->to_pid_to_str (ptid)) |
1237 | return target_beneath->to_pid_to_str (ptid); | |
fb0e1ba7 | 1238 | |
39f77062 | 1239 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1240 | } |
1241 | ||
b2756930 KB |
1242 | /* Get the address of the thread local variable in load module LM which |
1243 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1244 | |
1245 | static CORE_ADDR | |
b2756930 KB |
1246 | thread_db_get_thread_local_address (ptid_t ptid, |
1247 | CORE_ADDR lm, | |
b4acd559 | 1248 | CORE_ADDR offset) |
3f47be5c EZ |
1249 | { |
1250 | if (is_thread (ptid)) | |
1251 | { | |
3f47be5c | 1252 | td_err_e err; |
3f47be5c | 1253 | void *address; |
5365276c | 1254 | struct thread_info *thread_info; |
3f47be5c EZ |
1255 | |
1256 | /* glibc doesn't provide the needed interface. */ | |
b4acd559 | 1257 | if (!td_thr_tls_get_addr_p) |
109c3e39 AC |
1258 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1259 | _("No TLS library support")); | |
3f47be5c | 1260 | |
b2756930 KB |
1261 | /* Caller should have verified that lm != 0. */ |
1262 | gdb_assert (lm != 0); | |
3f47be5c EZ |
1263 | |
1264 | /* Get info about the thread. */ | |
5365276c DJ |
1265 | thread_info = find_thread_pid (ptid); |
1266 | thread_db_map_id2thr (thread_info, 1); | |
1267 | ||
3f47be5c | 1268 | /* Finally, get the address of the variable. */ |
5365276c DJ |
1269 | err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm, |
1270 | offset, &address); | |
3f47be5c EZ |
1271 | |
1272 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1273 | /* The memory hasn't been allocated, yet. */ | |
1274 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1275 | /* Now, if libthread_db provided the initialization image's |
1276 | address, we *could* try to build a non-lvalue value from | |
1277 | the initialization image. */ | |
109c3e39 AC |
1278 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1279 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1280 | #endif |
1281 | ||
1282 | /* Something else went wrong. */ | |
1283 | if (err != TD_OK) | |
109c3e39 AC |
1284 | throw_error (TLS_GENERIC_ERROR, |
1285 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1286 | |
1287 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1288 | /* Do proper sign extension for the target. */ |
1289 | gdb_assert (exec_bfd); | |
1290 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1291 | ? (CORE_ADDR) (intptr_t) address | |
1292 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1293 | } |
1294 | ||
1295 | if (target_beneath->to_get_thread_local_address) | |
b2756930 | 1296 | return target_beneath->to_get_thread_local_address (ptid, lm, offset); |
93ad78a7 | 1297 | else |
109c3e39 AC |
1298 | throw_error (TLS_GENERIC_ERROR, |
1299 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1300 | } |
1301 | ||
fb0e1ba7 MK |
1302 | static void |
1303 | init_thread_db_ops (void) | |
1304 | { | |
1305 | thread_db_ops.to_shortname = "multi-thread"; | |
1306 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1307 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
c194fbe1 | 1308 | thread_db_ops.to_attach = thread_db_attach; |
fb0e1ba7 MK |
1309 | thread_db_ops.to_detach = thread_db_detach; |
1310 | thread_db_ops.to_resume = thread_db_resume; | |
1311 | thread_db_ops.to_wait = thread_db_wait; | |
1312 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1313 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
10d6c8cd | 1314 | thread_db_ops.to_xfer_partial = thread_db_xfer_partial; |
fb0e1ba7 MK |
1315 | thread_db_ops.to_kill = thread_db_kill; |
1316 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1317 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1318 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1319 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1320 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1321 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1322 | thread_db_ops.to_stratum = thread_stratum; | |
1323 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1324 | thread_db_ops.to_get_thread_local_address |
1325 | = thread_db_get_thread_local_address; | |
fb0e1ba7 MK |
1326 | thread_db_ops.to_magic = OPS_MAGIC; |
1327 | } | |
1328 | ||
1329 | void | |
1330 | _initialize_thread_db (void) | |
1331 | { | |
1332 | /* Only initialize the module if we can load libthread_db. */ | |
1333 | if (thread_db_load ()) | |
1334 | { | |
1335 | init_thread_db_ops (); | |
1336 | add_target (&thread_db_ops); | |
1337 | ||
1338 | /* Add ourselves to objfile event chain. */ | |
9a4105ab AC |
1339 | target_new_objfile_chain = deprecated_target_new_objfile_hook; |
1340 | deprecated_target_new_objfile_hook = thread_db_new_objfile; | |
fb0e1ba7 MK |
1341 | } |
1342 | } |