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0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
4a94e368 | 2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
0d62e5e8 DJ |
3 | |
4 | Contributed by MontaVista Software. | |
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
0d62e5e8 DJ |
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 | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0d62e5e8 DJ |
20 | |
21 | #include "server.h" | |
22 | ||
23 | #include "linux-low.h" | |
24 | ||
f9d949fb | 25 | #include "debug.h" |
0050a760 | 26 | #include "gdb_proc_service.h" |
125f8a3d | 27 | #include "nat/gdb_thread_db.h" |
268a13a5 | 28 | #include "gdbsupport/gdb_vecs.h" |
2db9a427 | 29 | #include "nat/linux-procfs.h" |
268a13a5 | 30 | #include "gdbsupport/scoped_restore.h" |
0d62e5e8 | 31 | |
96f15937 | 32 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 33 | #include <dlfcn.h> |
96f15937 | 34 | #endif |
cdbfd419 PP |
35 | #include <limits.h> |
36 | #include <ctype.h> | |
37 | ||
38 | struct thread_db | |
39 | { | |
40 | /* Structure that identifies the child process for the | |
41 | <proc_service.h> interface. */ | |
42 | struct ps_prochandle proc_handle; | |
43 | ||
44 | /* Connection to the libthread_db library. */ | |
45 | td_thragent_t *thread_agent; | |
46 | ||
9836d6ea PA |
47 | /* If this flag has been set, we've already asked GDB for all |
48 | symbols we might need; assume symbol cache misses are | |
49 | failures. */ | |
50 | int all_symbols_looked_up; | |
51 | ||
96f15937 | 52 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 PP |
53 | /* Handle of the libthread_db from dlopen. */ |
54 | void *handle; | |
96f15937 | 55 | #endif |
cdbfd419 PP |
56 | |
57 | /* Addresses of libthread_db functions. */ | |
96e9210f | 58 | td_ta_new_ftype *td_ta_new_p; |
96e9210f PA |
59 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; |
60 | td_thr_get_info_ftype *td_thr_get_info_p; | |
96e9210f PA |
61 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; |
62 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; | |
63 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
64 | td_symbol_list_ftype *td_symbol_list_p; | |
cdbfd419 PP |
65 | }; |
66 | ||
67 | static char *libthread_db_search_path; | |
186947f7 | 68 | |
95954743 | 69 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
70 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
71 | ||
54363045 | 72 | static const char * |
0d62e5e8 DJ |
73 | thread_db_err_str (td_err_e err) |
74 | { | |
75 | static char buf[64]; | |
76 | ||
77 | switch (err) | |
78 | { | |
79 | case TD_OK: | |
80 | return "generic 'call succeeded'"; | |
81 | case TD_ERR: | |
82 | return "generic error"; | |
83 | case TD_NOTHR: | |
84 | return "no thread to satisfy query"; | |
85 | case TD_NOSV: | |
86 | return "no sync handle to satisfy query"; | |
87 | case TD_NOLWP: | |
88 | return "no LWP to satisfy query"; | |
89 | case TD_BADPH: | |
90 | return "invalid process handle"; | |
91 | case TD_BADTH: | |
92 | return "invalid thread handle"; | |
93 | case TD_BADSH: | |
94 | return "invalid synchronization handle"; | |
95 | case TD_BADTA: | |
96 | return "invalid thread agent"; | |
97 | case TD_BADKEY: | |
98 | return "invalid key"; | |
99 | case TD_NOMSG: | |
100 | return "no event message for getmsg"; | |
101 | case TD_NOFPREGS: | |
102 | return "FPU register set not available"; | |
103 | case TD_NOLIBTHREAD: | |
104 | return "application not linked with libthread"; | |
105 | case TD_NOEVENT: | |
106 | return "requested event is not supported"; | |
107 | case TD_NOCAPAB: | |
108 | return "capability not available"; | |
109 | case TD_DBERR: | |
110 | return "debugger service failed"; | |
111 | case TD_NOAPLIC: | |
112 | return "operation not applicable to"; | |
113 | case TD_NOTSD: | |
114 | return "no thread-specific data for this thread"; | |
115 | case TD_MALLOC: | |
116 | return "malloc failed"; | |
117 | case TD_PARTIALREG: | |
118 | return "only part of register set was written/read"; | |
119 | case TD_NOXREGS: | |
120 | return "X register set not available for this thread"; | |
3db0444b DJ |
121 | #ifdef HAVE_TD_VERSION |
122 | case TD_VERSION: | |
123 | return "version mismatch between libthread_db and libpthread"; | |
124 | #endif | |
0d62e5e8 | 125 | default: |
6cebaf6e | 126 | xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
0d62e5e8 DJ |
127 | return buf; |
128 | } | |
129 | } | |
130 | ||
131 | #if 0 | |
132 | static char * | |
133 | thread_db_state_str (td_thr_state_e state) | |
134 | { | |
135 | static char buf[64]; | |
136 | ||
137 | switch (state) | |
138 | { | |
139 | case TD_THR_STOPPED: | |
140 | return "stopped by debugger"; | |
141 | case TD_THR_RUN: | |
142 | return "runnable"; | |
143 | case TD_THR_ACTIVE: | |
144 | return "active"; | |
145 | case TD_THR_ZOMBIE: | |
146 | return "zombie"; | |
147 | case TD_THR_SLEEP: | |
148 | return "sleeping"; | |
149 | case TD_THR_STOPPED_ASLEEP: | |
150 | return "stopped by debugger AND blocked"; | |
151 | default: | |
6cebaf6e | 152 | xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
0d62e5e8 DJ |
153 | return buf; |
154 | } | |
155 | } | |
156 | #endif | |
157 | ||
94c207e0 PA |
158 | /* Get thread info about PTID, accessing memory via the current |
159 | thread. */ | |
160 | ||
ae13219e | 161 | static int |
95954743 | 162 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 163 | { |
ae13219e DJ |
164 | td_thrhandle_t th; |
165 | td_thrinfo_t ti; | |
0d62e5e8 | 166 | td_err_e err; |
54a0b537 | 167 | struct lwp_info *lwp; |
fe978cb0 | 168 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
e38504b3 | 169 | int lwpid = ptid.lwp (); |
0d62e5e8 | 170 | |
8dc7b443 SM |
171 | thread_info *thread = find_thread_ptid (ptid); |
172 | lwp = get_thread_lwp (thread); | |
54a0b537 | 173 | if (lwp->thread_known) |
ae13219e DJ |
174 | return 1; |
175 | ||
24a09b5f | 176 | /* Get information about this thread. */ |
cdbfd419 | 177 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 178 | if (err != TD_OK) |
24a09b5f DJ |
179 | error ("Cannot get thread handle for LWP %d: %s", |
180 | lwpid, thread_db_err_str (err)); | |
ae13219e | 181 | |
cdbfd419 | 182 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 183 | if (err != TD_OK) |
24a09b5f DJ |
184 | error ("Cannot get thread info for LWP %d: %s", |
185 | lwpid, thread_db_err_str (err)); | |
ae13219e | 186 | |
c058728c SM |
187 | threads_debug_printf ("Found thread %ld (LWP %d)", |
188 | (unsigned long) ti.ti_tid, ti.ti_lid); | |
ae13219e | 189 | |
95954743 | 190 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
191 | { |
192 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 193 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
194 | return 0; |
195 | } | |
ae13219e | 196 | |
24a09b5f DJ |
197 | /* If the new thread ID is zero, a final thread ID will be available |
198 | later. Do not enable thread debugging yet. */ | |
199 | if (ti.ti_tid == 0) | |
200 | return 0; | |
ae13219e | 201 | |
54a0b537 PA |
202 | lwp->thread_known = 1; |
203 | lwp->th = th; | |
f6327dcb | 204 | lwp->thread_handle = ti.ti_tid; |
ae13219e | 205 | |
ae13219e DJ |
206 | return 1; |
207 | } | |
208 | ||
5f7d1694 PP |
209 | /* Attach a thread. Return true on success. */ |
210 | ||
211 | static int | |
212 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 213 | { |
7ae1a6a6 PA |
214 | struct process_info *proc = current_process (); |
215 | int pid = pid_of (proc); | |
184ea2f7 | 216 | ptid_t ptid = ptid_t (pid, ti_p->ti_lid); |
54a0b537 | 217 | struct lwp_info *lwp; |
7ae1a6a6 | 218 | int err; |
ae13219e | 219 | |
c058728c SM |
220 | threads_debug_printf ("Attaching to thread %ld (LWP %d)", |
221 | (unsigned long) ti_p->ti_tid, ti_p->ti_lid); | |
fd000fb3 | 222 | err = the_linux_target->attach_lwp (ptid); |
7ae1a6a6 | 223 | if (err != 0) |
0d62e5e8 | 224 | { |
50fa3001 | 225 | std::string reason = linux_ptrace_attach_fail_reason_string (ptid, err); |
4d9b86e1 | 226 | |
422186a9 | 227 | warning ("Could not attach to thread %ld (LWP %d): %s", |
4d9b86e1 SM |
228 | (unsigned long) ti_p->ti_tid, ti_p->ti_lid, reason.c_str ()); |
229 | ||
5f7d1694 | 230 | return 0; |
0d62e5e8 DJ |
231 | } |
232 | ||
7ae1a6a6 PA |
233 | lwp = find_lwp_pid (ptid); |
234 | gdb_assert (lwp != NULL); | |
54a0b537 PA |
235 | lwp->thread_known = 1; |
236 | lwp->th = *th_p; | |
f6327dcb | 237 | lwp->thread_handle = ti_p->ti_tid; |
24a09b5f | 238 | |
5f7d1694 PP |
239 | return 1; |
240 | } | |
241 | ||
242 | /* Attach thread if we haven't seen it yet. | |
243 | Increment *COUNTER if we have attached a new thread. | |
244 | Return false on failure. */ | |
245 | ||
246 | static int | |
247 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
248 | int *counter) | |
249 | { | |
250 | struct lwp_info *lwp; | |
251 | ||
f2907e49 | 252 | lwp = find_lwp_pid (ptid_t (ti_p->ti_lid)); |
5f7d1694 PP |
253 | if (lwp != NULL) |
254 | return 1; | |
255 | ||
256 | if (!attach_thread (th_p, ti_p)) | |
257 | return 0; | |
258 | ||
259 | if (counter != NULL) | |
260 | *counter += 1; | |
261 | ||
262 | return 1; | |
0d62e5e8 DJ |
263 | } |
264 | ||
265 | static int | |
266 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
267 | { | |
268 | td_thrinfo_t ti; | |
269 | td_err_e err; | |
fe978cb0 | 270 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
0d62e5e8 | 271 | |
cdbfd419 | 272 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
273 | if (err != TD_OK) |
274 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
275 | ||
a33e3959 PA |
276 | if (ti.ti_lid == -1) |
277 | { | |
278 | /* A thread with kernel thread ID -1 is either a thread that | |
279 | exited and was joined, or a thread that is being created but | |
280 | hasn't started yet, and that is reusing the tcb/stack of a | |
281 | thread that previously exited and was joined. (glibc marks | |
282 | terminated and joined threads with kernel thread ID -1. See | |
283 | glibc PR17707. */ | |
c058728c SM |
284 | threads_debug_printf ("thread_db: skipping exited and " |
285 | "joined thread (0x%lx)", | |
286 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
287 | return 0; |
288 | } | |
289 | ||
0d62e5e8 DJ |
290 | /* Check for zombies. */ |
291 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
292 | return 0; | |
293 | ||
5f7d1694 PP |
294 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
295 | { | |
296 | /* Terminate iteration early: we might be looking at stale data in | |
297 | the inferior. The thread_db_find_new_threads will retry. */ | |
298 | return 1; | |
299 | } | |
0d62e5e8 DJ |
300 | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static void | |
305 | thread_db_find_new_threads (void) | |
306 | { | |
307 | td_err_e err; | |
fbd5db48 | 308 | ptid_t ptid = current_ptid; |
fe978cb0 | 309 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
5f7d1694 | 310 | int loop, iteration; |
0d62e5e8 | 311 | |
ae13219e DJ |
312 | /* This function is only called when we first initialize thread_db. |
313 | First locate the initial thread. If it is not ready for | |
314 | debugging yet, then stop. */ | |
95954743 | 315 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
316 | return; |
317 | ||
5f7d1694 PP |
318 | /* Require 4 successive iterations which do not find any new threads. |
319 | The 4 is a heuristic: there is an inherent race here, and I have | |
320 | seen that 2 iterations in a row are not always sufficient to | |
321 | "capture" all threads. */ | |
322 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
323 | { | |
324 | int new_thread_count = 0; | |
325 | ||
326 | /* Iterate over all user-space threads to discover new threads. */ | |
327 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
328 | find_new_threads_callback, | |
329 | &new_thread_count, | |
493e2a69 MS |
330 | TD_THR_ANY_STATE, |
331 | TD_THR_LOWEST_PRIORITY, | |
5f7d1694 | 332 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); |
c058728c SM |
333 | threads_debug_printf ("Found %d threads in iteration %d.", |
334 | new_thread_count, iteration); | |
5f7d1694 PP |
335 | |
336 | if (new_thread_count != 0) | |
337 | { | |
338 | /* Found new threads. Restart iteration from beginning. */ | |
339 | loop = -1; | |
340 | } | |
341 | } | |
0d62e5e8 DJ |
342 | if (err != TD_OK) |
343 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
344 | } | |
345 | ||
fd500816 DJ |
346 | /* Cache all future symbols that thread_db might request. We can not |
347 | request symbols at arbitrary states in the remote protocol, only | |
348 | when the client tells us that new symbols are available. So when | |
349 | we load the thread library, make sure to check the entire list. */ | |
350 | ||
351 | static void | |
352 | thread_db_look_up_symbols (void) | |
353 | { | |
fe978cb0 | 354 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
cdbfd419 | 355 | const char **sym_list; |
fd500816 DJ |
356 | CORE_ADDR unused; |
357 | ||
cdbfd419 | 358 | for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
9836d6ea PA |
359 | look_up_one_symbol (*sym_list, &unused, 1); |
360 | ||
361 | /* We're not interested in any other libraries loaded after this | |
362 | point, only in symbols in libpthread.so. */ | |
363 | thread_db->all_symbols_looked_up = 1; | |
364 | } | |
365 | ||
366 | int | |
367 | thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp) | |
368 | { | |
fe978cb0 | 369 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
9836d6ea PA |
370 | int may_ask_gdb = !thread_db->all_symbols_looked_up; |
371 | ||
372 | /* If we've passed the call to thread_db_look_up_symbols, then | |
373 | anything not in the cache must not exist; we're not interested | |
374 | in any libraries loaded after that point, only in symbols in | |
375 | libpthread.so. It might not be an appropriate time to look | |
376 | up a symbol, e.g. while we're trying to fetch registers. */ | |
377 | return look_up_one_symbol (name, addrp, may_ask_gdb); | |
fd500816 DJ |
378 | } |
379 | ||
dae5f5cf DJ |
380 | int |
381 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
382 | CORE_ADDR load_module, CORE_ADDR *address) | |
383 | { | |
dae5f5cf DJ |
384 | psaddr_t addr; |
385 | td_err_e err; | |
54a0b537 | 386 | struct lwp_info *lwp; |
cdbfd419 PP |
387 | struct process_info *proc; |
388 | struct thread_db *thread_db; | |
389 | ||
390 | proc = get_thread_process (thread); | |
fe978cb0 | 391 | thread_db = proc->priv->thread_db; |
dae5f5cf | 392 | |
7fe519cb | 393 | /* If the thread layer is not (yet) initialized, fail. */ |
8a4ac37e | 394 | if (thread_db == NULL || !thread_db->all_symbols_looked_up) |
7fe519cb UW |
395 | return TD_ERR; |
396 | ||
5876f503 JK |
397 | /* If td_thr_tls_get_addr is missing rather do not expect td_thr_tlsbase |
398 | could work. */ | |
399 | if (thread_db->td_thr_tls_get_addr_p == NULL | |
400 | || (load_module == 0 && thread_db->td_thr_tlsbase_p == NULL)) | |
cdbfd419 PP |
401 | return -1; |
402 | ||
54a0b537 PA |
403 | lwp = get_thread_lwp (thread); |
404 | if (!lwp->thread_known) | |
9c80ecd6 | 405 | find_one_thread (thread->id); |
54a0b537 | 406 | if (!lwp->thread_known) |
dae5f5cf DJ |
407 | return TD_NOTHR; |
408 | ||
24583e45 TBA |
409 | scoped_restore_current_thread restore_thread; |
410 | switch_to_thread (thread); | |
5876f503 JK |
411 | |
412 | if (load_module != 0) | |
413 | { | |
414 | /* Note the cast through uintptr_t: this interface only works if | |
415 | a target address fits in a psaddr_t, which is a host pointer. | |
416 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
417 | err = thread_db->td_thr_tls_get_addr_p (&lwp->th, | |
418 | (psaddr_t) (uintptr_t) load_module, | |
419 | offset, &addr); | |
420 | } | |
421 | else | |
422 | { | |
423 | /* This code path handles the case of -static -pthread executables: | |
424 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
425 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
426 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
427 | The constant number 1 depends on GNU __libc_setup_tls | |
428 | initialization of l_tls_modid to 1. */ | |
429 | err = thread_db->td_thr_tlsbase_p (&lwp->th, 1, &addr); | |
430 | addr = (char *) addr + offset; | |
431 | } | |
432 | ||
dae5f5cf DJ |
433 | if (err == TD_OK) |
434 | { | |
186947f7 | 435 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
436 | return 0; |
437 | } | |
438 | else | |
439 | return err; | |
cdbfd419 PP |
440 | } |
441 | ||
f6327dcb KB |
442 | /* See linux-low.h. */ |
443 | ||
444 | bool | |
445 | thread_db_thread_handle (ptid_t ptid, gdb_byte **handle, int *handle_len) | |
446 | { | |
447 | struct thread_db *thread_db; | |
448 | struct lwp_info *lwp; | |
8dc7b443 | 449 | thread_info *thread = find_thread_ptid (ptid); |
f6327dcb KB |
450 | |
451 | if (thread == NULL) | |
452 | return false; | |
453 | ||
454 | thread_db = get_thread_process (thread)->priv->thread_db; | |
455 | ||
456 | if (thread_db == NULL) | |
457 | return false; | |
458 | ||
459 | lwp = get_thread_lwp (thread); | |
460 | ||
9c80ecd6 | 461 | if (!lwp->thread_known && !find_one_thread (thread->id)) |
f6327dcb KB |
462 | return false; |
463 | ||
464 | gdb_assert (lwp->thread_known); | |
465 | ||
466 | *handle = (gdb_byte *) &lwp->thread_handle; | |
467 | *handle_len = sizeof (lwp->thread_handle); | |
468 | return true; | |
469 | } | |
470 | ||
96f15937 PP |
471 | #ifdef USE_LIBTHREAD_DB_DIRECTLY |
472 | ||
473 | static int | |
474 | thread_db_load_search (void) | |
475 | { | |
476 | td_err_e err; | |
9836d6ea | 477 | struct thread_db *tdb; |
96f15937 PP |
478 | struct process_info *proc = current_process (); |
479 | ||
fe978cb0 | 480 | gdb_assert (proc->priv->thread_db == NULL); |
96f15937 | 481 | |
8d749320 | 482 | tdb = XCNEW (struct thread_db); |
fe978cb0 | 483 | proc->priv->thread_db = tdb; |
f9e39928 | 484 | |
9836d6ea | 485 | tdb->td_ta_new_p = &td_ta_new; |
96f15937 PP |
486 | |
487 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 488 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
96f15937 PP |
489 | if (err != TD_OK) |
490 | { | |
c058728c | 491 | threads_debug_printf ("td_ta_new(): %s", thread_db_err_str (err)); |
9836d6ea | 492 | free (tdb); |
fe978cb0 | 493 | proc->priv->thread_db = NULL; |
96f15937 PP |
494 | return 0; |
495 | } | |
496 | ||
9836d6ea PA |
497 | tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; |
498 | tdb->td_thr_get_info_p = &td_thr_get_info; | |
499 | tdb->td_ta_thr_iter_p = &td_ta_thr_iter; | |
500 | tdb->td_symbol_list_p = &td_symbol_list; | |
96f15937 | 501 | |
96f15937 | 502 | /* These are not essential. */ |
9836d6ea | 503 | tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr; |
5876f503 | 504 | tdb->td_thr_tlsbase_p = &td_thr_tlsbase; |
96f15937 PP |
505 | |
506 | return 1; | |
507 | } | |
508 | ||
509 | #else | |
510 | ||
cdbfd419 PP |
511 | static int |
512 | try_thread_db_load_1 (void *handle) | |
513 | { | |
514 | td_err_e err; | |
9836d6ea | 515 | struct thread_db *tdb; |
cdbfd419 PP |
516 | struct process_info *proc = current_process (); |
517 | ||
fe978cb0 | 518 | gdb_assert (proc->priv->thread_db == NULL); |
cdbfd419 | 519 | |
8d749320 | 520 | tdb = XCNEW (struct thread_db); |
fe978cb0 | 521 | proc->priv->thread_db = tdb; |
f9e39928 | 522 | |
9836d6ea | 523 | tdb->handle = handle; |
cdbfd419 PP |
524 | |
525 | /* Initialize pointers to the dynamic library functions we will use. | |
526 | Essential functions first. */ | |
527 | ||
528 | #define CHK(required, a) \ | |
529 | do \ | |
530 | { \ | |
531 | if ((a) == NULL) \ | |
532 | { \ | |
c058728c | 533 | threads_debug_printf ("dlsym: %s", dlerror ()); \ |
cdbfd419 | 534 | if (required) \ |
9836d6ea PA |
535 | { \ |
536 | free (tdb); \ | |
fe978cb0 | 537 | proc->priv->thread_db = NULL; \ |
9836d6ea PA |
538 | return 0; \ |
539 | } \ | |
cdbfd419 PP |
540 | } \ |
541 | } \ | |
542 | while (0) | |
543 | ||
96e9210f PA |
544 | #define TDB_DLSYM(tdb, func) \ |
545 | tdb->func ## _p = (func ## _ftype *) dlsym (tdb->handle, #func) | |
546 | ||
547 | CHK (1, TDB_DLSYM (tdb, td_ta_new)); | |
cdbfd419 PP |
548 | |
549 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 550 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
cdbfd419 PP |
551 | if (err != TD_OK) |
552 | { | |
c058728c | 553 | threads_debug_printf ("td_ta_new(): %s", thread_db_err_str (err)); |
9836d6ea | 554 | free (tdb); |
fe978cb0 | 555 | proc->priv->thread_db = NULL; |
cdbfd419 PP |
556 | return 0; |
557 | } | |
558 | ||
96e9210f PA |
559 | CHK (1, TDB_DLSYM (tdb, td_ta_map_lwp2thr)); |
560 | CHK (1, TDB_DLSYM (tdb, td_thr_get_info)); | |
561 | CHK (1, TDB_DLSYM (tdb, td_ta_thr_iter)); | |
562 | CHK (1, TDB_DLSYM (tdb, td_symbol_list)); | |
cdbfd419 | 563 | |
cdbfd419 | 564 | /* These are not essential. */ |
96e9210f PA |
565 | CHK (0, TDB_DLSYM (tdb, td_thr_tls_get_addr)); |
566 | CHK (0, TDB_DLSYM (tdb, td_thr_tlsbase)); | |
cdbfd419 PP |
567 | |
568 | #undef CHK | |
96e9210f | 569 | #undef TDB_DLSYM |
cdbfd419 | 570 | |
cdbfd419 PP |
571 | return 1; |
572 | } | |
573 | ||
10e86dd7 DE |
574 | #ifdef HAVE_DLADDR |
575 | ||
cdbfd419 PP |
576 | /* Lookup a library in which given symbol resides. |
577 | Note: this is looking in the GDBSERVER process, not in the inferior. | |
578 | Returns library name, or NULL. */ | |
579 | ||
580 | static const char * | |
581 | dladdr_to_soname (const void *addr) | |
582 | { | |
583 | Dl_info info; | |
584 | ||
585 | if (dladdr (addr, &info) != 0) | |
586 | return info.dli_fname; | |
587 | return NULL; | |
588 | } | |
589 | ||
10e86dd7 DE |
590 | #endif |
591 | ||
cdbfd419 PP |
592 | static int |
593 | try_thread_db_load (const char *library) | |
594 | { | |
595 | void *handle; | |
596 | ||
c058728c SM |
597 | threads_debug_printf ("Trying host libthread_db library: %s.", |
598 | library); | |
cdbfd419 PP |
599 | handle = dlopen (library, RTLD_NOW); |
600 | if (handle == NULL) | |
601 | { | |
c058728c | 602 | threads_debug_printf ("dlopen failed: %s.", dlerror ()); |
cdbfd419 PP |
603 | return 0; |
604 | } | |
605 | ||
10e86dd7 | 606 | #ifdef HAVE_DLADDR |
cdbfd419 PP |
607 | if (debug_threads && strchr (library, '/') == NULL) |
608 | { | |
609 | void *td_init; | |
610 | ||
611 | td_init = dlsym (handle, "td_init"); | |
612 | if (td_init != NULL) | |
613 | { | |
614 | const char *const libpath = dladdr_to_soname (td_init); | |
615 | ||
616 | if (libpath != NULL) | |
c058728c | 617 | threads_debug_printf ("Host %s resolved to: %s.", library, libpath); |
cdbfd419 PP |
618 | } |
619 | } | |
10e86dd7 | 620 | #endif |
cdbfd419 PP |
621 | |
622 | if (try_thread_db_load_1 (handle)) | |
623 | return 1; | |
624 | ||
625 | /* This library "refused" to work on current inferior. */ | |
626 | dlclose (handle); | |
627 | return 0; | |
628 | } | |
629 | ||
98a5dd13 DE |
630 | /* Handle $sdir in libthread-db-search-path. |
631 | Look for libthread_db in the system dirs, or wherever a plain | |
632 | dlopen(file_without_path) will look. | |
633 | The result is true for success. */ | |
634 | ||
cdbfd419 | 635 | static int |
98a5dd13 DE |
636 | try_thread_db_load_from_sdir (void) |
637 | { | |
638 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
639 | } | |
640 | ||
641 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
642 | The result is true for success. */ | |
643 | ||
644 | static int | |
645 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
cdbfd419 PP |
646 | { |
647 | char path[PATH_MAX]; | |
98a5dd13 DE |
648 | |
649 | if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
650 | { | |
224c3ddb | 651 | char *cp = (char *) xmalloc (dir_len + 1); |
98a5dd13 DE |
652 | |
653 | memcpy (cp, dir, dir_len); | |
654 | cp[dir_len] = '\0'; | |
655 | warning (_("libthread-db-search-path component too long," | |
656 | " ignored: %s."), cp); | |
657 | free (cp); | |
658 | return 0; | |
659 | } | |
660 | ||
661 | memcpy (path, dir, dir_len); | |
662 | path[dir_len] = '/'; | |
663 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
664 | return try_thread_db_load (path); | |
665 | } | |
666 | ||
667 | /* Search libthread_db_search_path for libthread_db which "agrees" | |
668 | to work on current inferior. | |
669 | The result is true for success. */ | |
670 | ||
671 | static int | |
672 | thread_db_load_search (void) | |
673 | { | |
e80aaf61 | 674 | int rc = 0; |
cdbfd419 PP |
675 | |
676 | if (libthread_db_search_path == NULL) | |
677 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
678 | ||
e80aaf61 SM |
679 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
680 | = dirnames_to_char_ptr_vec (libthread_db_search_path); | |
e6712ff1 | 681 | |
e80aaf61 | 682 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
cdbfd419 | 683 | { |
e80aaf61 | 684 | char *this_dir = this_dir_up.get (); |
e6712ff1 | 685 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 DE |
686 | size_t this_dir_len; |
687 | ||
e6712ff1 | 688 | this_dir_len = strlen (this_dir); |
cdbfd419 | 689 | |
e6712ff1 DE |
690 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
691 | && (this_dir[pdir_len] == '\0' | |
692 | || this_dir[pdir_len] == '/')) | |
98a5dd13 DE |
693 | { |
694 | /* We don't maintain a list of loaded libraries so we don't know | |
695 | where libpthread lives. We *could* fetch the info, but we don't | |
696 | do that yet. Ignore it. */ | |
697 | } | |
e6712ff1 | 698 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
699 | { |
700 | if (try_thread_db_load_from_sdir ()) | |
cdbfd419 | 701 | { |
98a5dd13 | 702 | rc = 1; |
cdbfd419 PP |
703 | break; |
704 | } | |
cdbfd419 | 705 | } |
98a5dd13 | 706 | else |
cdbfd419 | 707 | { |
98a5dd13 DE |
708 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
709 | { | |
710 | rc = 1; | |
711 | break; | |
712 | } | |
cdbfd419 PP |
713 | } |
714 | } | |
cdbfd419 | 715 | |
c058728c | 716 | threads_debug_printf ("thread_db_load_search returning %d", rc); |
cdbfd419 | 717 | return rc; |
dae5f5cf DJ |
718 | } |
719 | ||
96f15937 PP |
720 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
721 | ||
0d62e5e8 | 722 | int |
9b4c5f87 | 723 | thread_db_init (void) |
0d62e5e8 | 724 | { |
95954743 | 725 | struct process_info *proc = current_process (); |
0d62e5e8 | 726 | |
fd500816 DJ |
727 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
728 | GNU/Linux calls tgid, "thread group ID". When we support | |
729 | attaching to threads, the original thread may not be the correct | |
730 | thread. We would have to get the process ID from /proc for NPTL. | |
fd500816 DJ |
731 | |
732 | This isn't the only place in gdbserver that assumes that the first | |
733 | process in the list is the thread group leader. */ | |
ea025f5f | 734 | |
cdbfd419 | 735 | if (thread_db_load_search ()) |
0d62e5e8 | 736 | { |
2db9a427 PA |
737 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
738 | data structures in the inferior's address space that may be | |
739 | corrupted, or, if the target is running, the list may change | |
740 | while we walk it. In the latter case, it's possible that a | |
741 | thread exits just at the exact time that causes GDBserver to | |
9b4c5f87 AT |
742 | get stuck in an infinite loop. As the kernel supports clone |
743 | events and /proc/PID/task/ exists, then we already know about | |
2db9a427 PA |
744 | all threads in the process. When we need info out of |
745 | thread_db on a given thread (e.g., for TLS), we'll use | |
746 | find_one_thread then. That uses thread_db entry points that | |
747 | do not walk libpthread's thread list, so should be safe, as | |
748 | well as more efficient. */ | |
9b4c5f87 | 749 | if (!linux_proc_task_list_dir_exists (pid_of (proc))) |
2db9a427 | 750 | thread_db_find_new_threads (); |
fd500816 | 751 | thread_db_look_up_symbols (); |
0d62e5e8 | 752 | return 1; |
cdbfd419 | 753 | } |
0d62e5e8 | 754 | |
cdbfd419 PP |
755 | return 0; |
756 | } | |
757 | ||
758 | /* Disconnect from libthread_db and free resources. */ | |
759 | ||
8336d594 PA |
760 | static void |
761 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 | 762 | { |
fe978cb0 | 763 | struct thread_db *thread_db = proc->priv->thread_db; |
cdbfd419 PP |
764 | if (thread_db) |
765 | { | |
21e1bee4 PP |
766 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
767 | td_thr_events_t *event); | |
768 | ||
fd7dd3e6 | 769 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
96e9210f PA |
770 | td_ta_clear_event_p |
771 | = (td_ta_clear_event_ftype *) dlsym (thread_db->handle, | |
772 | "td_ta_clear_event"); | |
fd7dd3e6 | 773 | #else |
fd7dd3e6 PA |
774 | td_ta_clear_event_p = &td_ta_clear_event; |
775 | #endif | |
776 | ||
8336d594 | 777 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 778 | { |
24583e45 | 779 | scoped_restore_current_thread restore_thread; |
21e1bee4 | 780 | td_thr_events_t events; |
8336d594 | 781 | |
f9e39928 | 782 | switch_to_process (proc); |
21e1bee4 | 783 | |
fd7dd3e6 PA |
784 | /* Set the process wide mask saying we aren't interested |
785 | in any events anymore. */ | |
21e1bee4 PP |
786 | td_event_fillset (&events); |
787 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
788 | } | |
8336d594 PA |
789 | } |
790 | } | |
791 | ||
792 | void | |
793 | thread_db_detach (struct process_info *proc) | |
794 | { | |
fe978cb0 | 795 | struct thread_db *thread_db = proc->priv->thread_db; |
f9e39928 PA |
796 | |
797 | if (thread_db) | |
798 | { | |
799 | disable_thread_event_reporting (proc); | |
f9e39928 | 800 | } |
8336d594 PA |
801 | } |
802 | ||
803 | /* Disconnect from libthread_db and free resources. */ | |
804 | ||
805 | void | |
806 | thread_db_mourn (struct process_info *proc) | |
807 | { | |
fe978cb0 | 808 | struct thread_db *thread_db = proc->priv->thread_db; |
8336d594 PA |
809 | if (thread_db) |
810 | { | |
96e9210f | 811 | td_ta_delete_ftype *td_ta_delete_p; |
8336d594 PA |
812 | |
813 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
96e9210f | 814 | td_ta_delete_p = (td_ta_delete_ftype *) dlsym (thread_db->handle, "td_ta_delete"); |
8336d594 PA |
815 | #else |
816 | td_ta_delete_p = &td_ta_delete; | |
817 | #endif | |
cdbfd419 | 818 | |
cdbfd419 PP |
819 | if (td_ta_delete_p != NULL) |
820 | (*td_ta_delete_p) (thread_db->thread_agent); | |
821 | ||
fd7dd3e6 | 822 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 823 | dlclose (thread_db->handle); |
96f15937 PP |
824 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
825 | ||
cdbfd419 | 826 | free (thread_db); |
fe978cb0 | 827 | proc->priv->thread_db = NULL; |
cdbfd419 PP |
828 | } |
829 | } | |
830 | ||
831 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
832 | For any other command, return 0. */ | |
833 | ||
834 | int | |
835 | thread_db_handle_monitor_command (char *mon) | |
836 | { | |
84e578fb DE |
837 | const char *cmd = "set libthread-db-search-path"; |
838 | size_t cmd_len = strlen (cmd); | |
839 | ||
840 | if (strncmp (mon, cmd, cmd_len) == 0 | |
841 | && (mon[cmd_len] == '\0' | |
842 | || mon[cmd_len] == ' ')) | |
cdbfd419 | 843 | { |
84e578fb | 844 | const char *cp = mon + cmd_len; |
cdbfd419 PP |
845 | |
846 | if (libthread_db_search_path != NULL) | |
847 | free (libthread_db_search_path); | |
848 | ||
849 | /* Skip leading space (if any). */ | |
850 | while (isspace (*cp)) | |
851 | ++cp; | |
852 | ||
84e578fb DE |
853 | if (*cp == '\0') |
854 | cp = LIBTHREAD_DB_SEARCH_PATH; | |
cdbfd419 PP |
855 | libthread_db_search_path = xstrdup (cp); |
856 | ||
857 | monitor_output ("libthread-db-search-path set to `"); | |
858 | monitor_output (libthread_db_search_path); | |
859 | monitor_output ("'\n"); | |
860 | return 1; | |
0d62e5e8 DJ |
861 | } |
862 | ||
cdbfd419 | 863 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
864 | return 0; |
865 | } | |
86299109 KB |
866 | |
867 | /* See linux-low.h. */ | |
868 | ||
869 | void | |
94c207e0 | 870 | thread_db_notice_clone (struct thread_info *parent_thr, ptid_t child_ptid) |
86299109 | 871 | { |
94c207e0 PA |
872 | process_info *parent_proc = get_thread_process (parent_thr); |
873 | struct thread_db *thread_db = parent_proc->priv->thread_db; | |
86299109 KB |
874 | |
875 | /* If the thread layer isn't initialized, return. It may just | |
876 | be that the program uses clone, but does not use libthread_db. */ | |
877 | if (thread_db == NULL || !thread_db->all_symbols_looked_up) | |
878 | return; | |
879 | ||
94c207e0 PA |
880 | /* find_one_thread calls into libthread_db which accesses memory via |
881 | the current thread. Temporarily switch to a thread we know is | |
882 | stopped. */ | |
24583e45 TBA |
883 | scoped_restore_current_thread restore_thread; |
884 | switch_to_thread (parent_thr); | |
94c207e0 PA |
885 | |
886 | if (!find_one_thread (child_ptid)) | |
422186a9 | 887 | warning ("Cannot find thread after clone."); |
86299109 | 888 | } |