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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
e2882c85 | 3 | Copyright (C) 1999-2018 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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
fb0e1ba7 MK |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
fb0e1ba7 MK |
19 | |
20 | #include "defs.h" | |
fb0e1ba7 MK |
21 | #include <dlfcn.h> |
22 | #include "gdb_proc_service.h" | |
125f8a3d | 23 | #include "nat/gdb_thread_db.h" |
e6712ff1 | 24 | #include "gdb_vecs.h" |
bda9cb72 | 25 | #include "bfd.h" |
17a37d48 | 26 | #include "command.h" |
17a37d48 | 27 | #include "gdbcmd.h" |
fb0e1ba7 MK |
28 | #include "gdbthread.h" |
29 | #include "inferior.h" | |
45741a9c | 30 | #include "infrun.h" |
bda9cb72 MK |
31 | #include "symfile.h" |
32 | #include "objfiles.h" | |
fb0e1ba7 | 33 | #include "target.h" |
4e052eda | 34 | #include "regcache.h" |
17a37d48 | 35 | #include "solib.h" |
3f47be5c | 36 | #include "solib-svr4.h" |
16451949 | 37 | #include "gdbcore.h" |
06d3b283 | 38 | #include "observer.h" |
0ec9a092 | 39 | #include "linux-nat.h" |
125f8a3d | 40 | #include "nat/linux-procfs.h" |
c1a747c1 | 41 | #include "nat/linux-ptrace.h" |
125f8a3d | 42 | #include "nat/linux-osdata.h" |
bf88dd68 | 43 | #include "auto-load.h" |
529480d0 | 44 | #include "cli/cli-utils.h" |
979894f2 | 45 | #include <signal.h> |
bf88dd68 | 46 | #include <ctype.h> |
9bc3a976 | 47 | #include "nat/linux-namespaces.h" |
325fac50 | 48 | #include <algorithm> |
b4987c95 | 49 | #include "common/pathstuff.h" |
979894f2 | 50 | |
17faa917 DJ |
51 | /* GNU/Linux libthread_db support. |
52 | ||
53 | libthread_db is a library, provided along with libpthread.so, which | |
54 | exposes the internals of the thread library to a debugger. It | |
55 | allows GDB to find existing threads, new threads as they are | |
56 | created, thread IDs (usually, the result of pthread_self), and | |
57 | thread-local variables. | |
58 | ||
4a6ed09b PA |
59 | The libthread_db interface originates on Solaris, where it is both |
60 | more powerful and more complicated. This implementation only works | |
61 | for NPTL, the glibc threading library. It assumes that each thread | |
62 | is permanently assigned to a single light-weight process (LWP). At | |
63 | some point it also supported the older LinuxThreads library, but it | |
64 | no longer does. | |
17faa917 DJ |
65 | |
66 | libthread_db-specific information is stored in the "private" field | |
67 | of struct thread_info. When the field is NULL we do not yet have | |
68 | information about the new thread; this could be temporary (created, | |
69 | but the thread library's data structures do not reflect it yet) | |
70 | or permanent (created using clone instead of pthread_create). | |
71 | ||
72 | Process IDs managed by linux-thread-db.c match those used by | |
73 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
74 | thread, and no TID. We save the TID in private. Keeping it out | |
75 | of the ptid_t prevents thread IDs changing when libpthread is | |
76 | loaded or unloaded. */ | |
77 | ||
17a37d48 PP |
78 | static char *libthread_db_search_path; |
79 | ||
bf88dd68 JK |
80 | /* Set to non-zero if thread_db auto-loading is enabled |
81 | by the "set auto-load libthread-db" command. */ | |
82 | static int auto_load_thread_db = 1; | |
83 | ||
84 | /* "show" command for the auto_load_thread_db configuration variable. */ | |
85 | ||
86 | static void | |
87 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
88 | struct cmd_list_element *c, const char *value) | |
89 | { | |
90 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
91 | "is %s.\n"), | |
92 | value); | |
93 | } | |
94 | ||
84e578fb | 95 | static void |
eb4c3f4a | 96 | set_libthread_db_search_path (const char *ignored, int from_tty, |
84e578fb DE |
97 | struct cmd_list_element *c) |
98 | { | |
99 | if (*libthread_db_search_path == '\0') | |
100 | { | |
101 | xfree (libthread_db_search_path); | |
102 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
103 | } | |
104 | } | |
105 | ||
02d868e8 PP |
106 | /* If non-zero, print details of libthread_db processing. */ |
107 | ||
ccce17b0 | 108 | static unsigned int libthread_db_debug; |
02d868e8 PP |
109 | |
110 | static void | |
111 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
112 | struct cmd_list_element *c, const char *value) | |
113 | { | |
114 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
115 | } | |
116 | ||
8605d56e AC |
117 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
118 | threads. */ | |
fb0e1ba7 | 119 | |
fb0e1ba7 MK |
120 | /* This module's target vector. */ |
121 | static struct target_ops thread_db_ops; | |
122 | ||
fb0e1ba7 MK |
123 | /* Non-zero if we have determined the signals used by the threads |
124 | library. */ | |
125 | static int thread_signals; | |
126 | static sigset_t thread_stop_set; | |
127 | static sigset_t thread_print_set; | |
128 | ||
d90e17a7 PA |
129 | struct thread_db_info |
130 | { | |
131 | struct thread_db_info *next; | |
132 | ||
133 | /* Process id this object refers to. */ | |
134 | int pid; | |
135 | ||
136 | /* Handle from dlopen for libthread_db.so. */ | |
137 | void *handle; | |
138 | ||
bf88dd68 JK |
139 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
140 | HANDLE. It may be NULL for system library. */ | |
141 | char *filename; | |
142 | ||
d90e17a7 PA |
143 | /* Structure that identifies the child process for the |
144 | <proc_service.h> interface. */ | |
145 | struct ps_prochandle proc_handle; | |
146 | ||
147 | /* Connection to the libthread_db library. */ | |
148 | td_thragent_t *thread_agent; | |
149 | ||
4d062f1a PA |
150 | /* True if we need to apply the workaround for glibc/BZ5983. When |
151 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
152 | list, nptl_db returns the parent's threads in addition to the new | |
153 | (single) child thread. If this flag is set, we do extra work to | |
154 | be able to ignore such stale entries. */ | |
155 | int need_stale_parent_threads_check; | |
156 | ||
d90e17a7 | 157 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 158 | |
96e9210f PA |
159 | td_init_ftype *td_init_p; |
160 | td_ta_new_ftype *td_ta_new_p; | |
161 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; | |
162 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f | 163 | td_thr_get_info_ftype *td_thr_get_info_p; |
96e9210f PA |
164 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
165 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
166 | }; |
167 | ||
168 | /* List of known processes using thread_db, and the required | |
169 | bookkeeping. */ | |
170 | struct thread_db_info *thread_db_list; | |
171 | ||
172 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 173 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 | 174 | |
2db9a427 PA |
175 | static void check_thread_signals (void); |
176 | ||
be550b6e DE |
177 | static struct thread_info *record_thread |
178 | (struct thread_db_info *info, struct thread_info *tp, | |
179 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 180 | |
d90e17a7 PA |
181 | /* Add the current inferior to the list of processes using libpthread. |
182 | Return a pointer to the newly allocated object that was added to | |
183 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
184 | LIBTHREAD_DB_SO. */ | |
185 | ||
186 | static struct thread_db_info * | |
187 | add_thread_db_info (void *handle) | |
188 | { | |
8d749320 | 189 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 190 | |
d90e17a7 PA |
191 | info->pid = ptid_get_pid (inferior_ptid); |
192 | info->handle = handle; | |
856d6f99 PA |
193 | |
194 | /* The workaround works by reading from /proc/pid/status, so it is | |
195 | disabled for core files. */ | |
196 | if (target_has_execution) | |
197 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
198 | |
199 | info->next = thread_db_list; | |
200 | thread_db_list = info; | |
201 | ||
202 | return info; | |
203 | } | |
204 | ||
205 | /* Return the thread_db_info object representing the bookkeeping | |
206 | related to process PID, if any; NULL otherwise. */ | |
207 | ||
208 | static struct thread_db_info * | |
209 | get_thread_db_info (int pid) | |
210 | { | |
211 | struct thread_db_info *info; | |
212 | ||
213 | for (info = thread_db_list; info; info = info->next) | |
214 | if (pid == info->pid) | |
215 | return info; | |
216 | ||
217 | return NULL; | |
218 | } | |
219 | ||
220 | /* When PID has exited or has been detached, we no longer want to keep | |
221 | track of it as using libpthread. Call this function to discard | |
222 | thread_db related info related to PID. Note that this closes | |
223 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
224 | ||
225 | static void | |
226 | delete_thread_db_info (int pid) | |
227 | { | |
228 | struct thread_db_info *info, *info_prev; | |
229 | ||
230 | info_prev = NULL; | |
231 | ||
232 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
233 | if (pid == info->pid) | |
234 | break; | |
235 | ||
236 | if (info == NULL) | |
237 | return; | |
238 | ||
239 | if (info->handle != NULL) | |
240 | dlclose (info->handle); | |
241 | ||
bf88dd68 JK |
242 | xfree (info->filename); |
243 | ||
d90e17a7 PA |
244 | if (info_prev) |
245 | info_prev->next = info->next; | |
246 | else | |
247 | thread_db_list = info->next; | |
248 | ||
249 | xfree (info); | |
250 | } | |
fb0e1ba7 | 251 | |
5365276c DJ |
252 | /* Use "struct private_thread_info" to cache thread state. This is |
253 | a substantial optimization. */ | |
254 | ||
7aabaf9d | 255 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 256 | { |
a2f23071 | 257 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 258 | bool dying = false; |
a2f23071 | 259 | |
5365276c | 260 | /* Cached thread state. */ |
7aabaf9d SM |
261 | td_thrhandle_t th {}; |
262 | thread_t tid {}; | |
fb0e1ba7 | 263 | }; |
7aabaf9d SM |
264 | |
265 | static thread_db_thread_info * | |
266 | get_thread_db_thread_info (thread_info *thread) | |
267 | { | |
268 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
269 | } | |
21bf60fe | 270 | |
a121b7c1 | 271 | static const char * |
fb0e1ba7 MK |
272 | thread_db_err_str (td_err_e err) |
273 | { | |
274 | static char buf[64]; | |
275 | ||
276 | switch (err) | |
277 | { | |
278 | case TD_OK: | |
279 | return "generic 'call succeeded'"; | |
280 | case TD_ERR: | |
281 | return "generic error"; | |
282 | case TD_NOTHR: | |
283 | return "no thread to satisfy query"; | |
284 | case TD_NOSV: | |
285 | return "no sync handle to satisfy query"; | |
286 | case TD_NOLWP: | |
287 | return "no LWP to satisfy query"; | |
288 | case TD_BADPH: | |
289 | return "invalid process handle"; | |
290 | case TD_BADTH: | |
291 | return "invalid thread handle"; | |
292 | case TD_BADSH: | |
293 | return "invalid synchronization handle"; | |
294 | case TD_BADTA: | |
295 | return "invalid thread agent"; | |
296 | case TD_BADKEY: | |
297 | return "invalid key"; | |
298 | case TD_NOMSG: | |
299 | return "no event message for getmsg"; | |
300 | case TD_NOFPREGS: | |
301 | return "FPU register set not available"; | |
302 | case TD_NOLIBTHREAD: | |
303 | return "application not linked with libthread"; | |
304 | case TD_NOEVENT: | |
305 | return "requested event is not supported"; | |
306 | case TD_NOCAPAB: | |
307 | return "capability not available"; | |
308 | case TD_DBERR: | |
309 | return "debugger service failed"; | |
310 | case TD_NOAPLIC: | |
311 | return "operation not applicable to"; | |
312 | case TD_NOTSD: | |
313 | return "no thread-specific data for this thread"; | |
314 | case TD_MALLOC: | |
315 | return "malloc failed"; | |
316 | case TD_PARTIALREG: | |
317 | return "only part of register set was written/read"; | |
318 | case TD_NOXREGS: | |
319 | return "X register set not available for this thread"; | |
59f80f10 DJ |
320 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
321 | case TD_NOTALLOC: | |
322 | return "thread has not yet allocated TLS for given module"; | |
323 | #endif | |
324 | #ifdef THREAD_DB_HAS_TD_VERSION | |
325 | case TD_VERSION: | |
326 | return "versions of libpthread and libthread_db do not match"; | |
327 | #endif | |
328 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
329 | case TD_NOTLS: | |
330 | return "there is no TLS segment in the given module"; | |
331 | #endif | |
fb0e1ba7 MK |
332 | default: |
333 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
334 | return buf; | |
335 | } | |
336 | } | |
4105de34 | 337 | |
64776a0b | 338 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 339 | |
be550b6e | 340 | static struct thread_info * |
39f77062 | 341 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 342 | { |
fb0e1ba7 | 343 | td_thrhandle_t th; |
2db9a427 | 344 | td_thrinfo_t ti; |
fb0e1ba7 | 345 | td_err_e err; |
d90e17a7 | 346 | struct thread_db_info *info; |
2db9a427 | 347 | struct thread_info *tp; |
fb0e1ba7 | 348 | |
6cb9b55b PP |
349 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
350 | th.th_unique = 0; | |
351 | ||
17faa917 DJ |
352 | /* This ptid comes from linux-nat.c, which should always fill in the |
353 | LWP. */ | |
dfd4cc63 | 354 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 355 | |
dfd4cc63 | 356 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 357 | |
4c28f408 | 358 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 359 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
360 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
361 | &th); | |
fb0e1ba7 | 362 | if (err != TD_OK) |
8a3fe4f8 | 363 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 364 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 365 | |
2db9a427 PA |
366 | err = info->td_thr_get_info_p (&th, &ti); |
367 | if (err != TD_OK) | |
368 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
369 | thread_db_err_str (err)); | |
370 | ||
371 | /* Fill the cache. */ | |
372 | tp = find_thread_ptid (ptid); | |
be550b6e | 373 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
374 | } |
375 | \f | |
376 | ||
2db9a427 PA |
377 | /* See linux-nat.h. */ |
378 | ||
4c28f408 | 379 | int |
2db9a427 | 380 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 381 | { |
d90e17a7 | 382 | struct thread_db_info *info; |
4c28f408 | 383 | |
2db9a427 | 384 | info = get_thread_db_info (ptid_get_pid (child)); |
d90e17a7 PA |
385 | |
386 | if (info == NULL) | |
4c28f408 PA |
387 | return 0; |
388 | ||
2db9a427 | 389 | thread_from_lwp (child); |
4c28f408 | 390 | |
2db9a427 PA |
391 | /* If we do not know about the main thread yet, this would be a good |
392 | time to find it. */ | |
393 | thread_from_lwp (parent); | |
4c28f408 PA |
394 | return 1; |
395 | } | |
396 | ||
5220ea4c AC |
397 | static void * |
398 | verbose_dlsym (void *handle, const char *name) | |
399 | { | |
400 | void *sym = dlsym (handle, name); | |
401 | if (sym == NULL) | |
3e43a32a MS |
402 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
403 | name, dlerror ()); | |
5220ea4c AC |
404 | return sym; |
405 | } | |
406 | ||
fcb44371 JK |
407 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
408 | return 1 if this version is lower (and not equal) to | |
409 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
410 | ||
411 | static int | |
412 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
413 | { | |
3b7344d5 | 414 | struct bound_minimal_symbol version_msym; |
fcb44371 JK |
415 | CORE_ADDR version_addr; |
416 | char *version; | |
417 | int err, got, retval = 0; | |
418 | ||
419 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 420 | if (version_msym.minsym == NULL) |
fcb44371 JK |
421 | return 0; |
422 | ||
77e371c0 | 423 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 JK |
424 | got = target_read_string (version_addr, &version, 32, &err); |
425 | if (err == 0 && memchr (version, 0, got) == &version[got -1]) | |
426 | { | |
427 | int major, minor; | |
428 | ||
429 | retval = (sscanf (version, "%d.%d", &major, &minor) == 2 | |
430 | && (major < ver_major_min | |
431 | || (major == ver_major_min && minor < ver_minor_min))); | |
432 | } | |
433 | xfree (version); | |
434 | ||
435 | return retval; | |
436 | } | |
437 | ||
fcb44371 JK |
438 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
439 | if appropriate. | |
456b0e24 | 440 | |
fcb44371 JK |
441 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
442 | otherwise. */ | |
443 | ||
444 | static int | |
456b0e24 PP |
445 | thread_db_find_new_threads_silently (ptid_t ptid) |
446 | { | |
456b0e24 | 447 | |
492d29ea | 448 | TRY |
456b0e24 | 449 | { |
02c6c942 | 450 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
451 | } |
452 | ||
492d29ea | 453 | CATCH (except, RETURN_MASK_ERROR) |
e0881a8e | 454 | { |
fcb44371 | 455 | if (libthread_db_debug) |
883ed13e | 456 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
457 | "Warning: thread_db_find_new_threads_silently: "); |
458 | ||
459 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
460 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
461 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
462 | executables if td_thr_get_info is called before glibc has initialized | |
463 | itself. | |
464 | ||
465 | If the nptl bug is NOT present in the inferior and still thread_db | |
466 | reports an error return 1. It means the inferior has corrupted thread | |
467 | list and GDB should fall back only to LWPs. | |
468 | ||
469 | If the nptl bug is present in the inferior return 0 to silently ignore | |
470 | such errors, and let gdb enumerate threads again later. In such case | |
471 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
472 | corrupted. For core files it does not apply, no 'later enumeration' |
473 | is possible. */ | |
fcb44371 | 474 | |
889003ed | 475 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
476 | { |
477 | exception_fprintf (gdb_stderr, except, | |
478 | _("Warning: couldn't activate thread debugging " | |
479 | "using libthread_db: ")); | |
480 | return 1; | |
481 | } | |
e0881a8e | 482 | } |
492d29ea PA |
483 | END_CATCH |
484 | ||
fcb44371 | 485 | return 0; |
456b0e24 PP |
486 | } |
487 | ||
d90e17a7 PA |
488 | /* Lookup a library in which given symbol resides. |
489 | Note: this is looking in GDB process, not in the inferior. | |
490 | Returns library name, or NULL. */ | |
491 | ||
492 | static const char * | |
493 | dladdr_to_soname (const void *addr) | |
494 | { | |
495 | Dl_info info; | |
496 | ||
497 | if (dladdr (addr, &info) != 0) | |
498 | return info.dli_fname; | |
499 | return NULL; | |
500 | } | |
501 | ||
2471d008 | 502 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
503 | Return 1 on success. |
504 | Failure could happen if libthread_db does not have symbols we expect, | |
505 | or when it refuses to work with the current inferior (e.g. due to | |
506 | version mismatch between libthread_db and libpthread). */ | |
507 | ||
508 | static int | |
d90e17a7 | 509 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
510 | { |
511 | td_err_e err; | |
512 | ||
513 | /* Initialize pointers to the dynamic library functions we will use. | |
514 | Essential functions first. */ | |
515 | ||
96e9210f PA |
516 | #define TDB_VERBOSE_DLSYM(info, func) \ |
517 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
518 | ||
519 | #define TDB_DLSYM(info, func) \ | |
520 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
521 | ||
522 | #define CHK(a) \ | |
523 | do \ | |
524 | { \ | |
525 | if ((a) == NULL) \ | |
526 | return 0; \ | |
527 | } while (0) | |
528 | ||
529 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 530 | |
d90e17a7 | 531 | err = info->td_init_p (); |
17a37d48 PP |
532 | if (err != TD_OK) |
533 | { | |
3e43a32a MS |
534 | warning (_("Cannot initialize libthread_db: %s"), |
535 | thread_db_err_str (err)); | |
17a37d48 PP |
536 | return 0; |
537 | } | |
538 | ||
96e9210f | 539 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
540 | |
541 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 542 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
543 | |
544 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 545 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
546 | if (err != TD_OK) |
547 | { | |
02d868e8 | 548 | if (libthread_db_debug) |
883ed13e PA |
549 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
550 | thread_db_err_str (err)); | |
17a37d48 PP |
551 | else |
552 | switch (err) | |
553 | { | |
554 | case TD_NOLIBTHREAD: | |
555 | #ifdef THREAD_DB_HAS_TD_VERSION | |
556 | case TD_VERSION: | |
557 | #endif | |
558 | /* The errors above are not unexpected and silently ignored: | |
559 | they just mean we haven't found correct version of | |
560 | libthread_db yet. */ | |
561 | break; | |
562 | default: | |
563 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
564 | } | |
565 | return 0; | |
566 | } | |
567 | ||
96e9210f PA |
568 | /* These are essential. */ |
569 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
96e9210f | 570 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); |
17a37d48 PP |
571 | |
572 | /* These are not essential. */ | |
96e9210f PA |
573 | TDB_DLSYM (info, td_thr_tls_get_addr); |
574 | TDB_DLSYM (info, td_thr_tlsbase); | |
575 | ||
2db9a427 PA |
576 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
577 | structures in the inferior's address space that may be corrupted, | |
578 | or, if the target is running, may change while we walk them. If | |
579 | there's execution (and /proc is mounted), then we're already | |
580 | attached to all LWPs. Use thread_from_lwp, which uses | |
581 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
582 | ||
583 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
584 | currently on core targets, as it uses ptrace directly. */ | |
585 | if (target_has_execution | |
586 | && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid))) | |
1eb2dbb8 PA |
587 | info->td_ta_thr_iter_p = NULL; |
588 | else | |
589 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
590 | ||
591 | #undef TDB_VERBOSE_DLSYM | |
592 | #undef TDB_DLSYM | |
593 | #undef CHK | |
594 | ||
595 | if (info->td_ta_thr_iter_p == NULL) | |
2db9a427 PA |
596 | { |
597 | struct lwp_info *lp; | |
598 | int pid = ptid_get_pid (inferior_ptid); | |
599 | ||
600 | linux_stop_and_wait_all_lwps (); | |
601 | ||
602 | ALL_LWPS (lp) | |
603 | if (ptid_get_pid (lp->ptid) == pid) | |
604 | thread_from_lwp (lp->ptid); | |
605 | ||
606 | linux_unstop_all_lwps (); | |
607 | } | |
608 | else if (thread_db_find_new_threads_silently (inferior_ptid) != 0) | |
fcb44371 JK |
609 | { |
610 | /* Even if libthread_db initializes, if the thread list is | |
611 | corrupted, we'd not manage to list any threads. Better reject this | |
612 | thread_db, and fall back to at least listing LWPs. */ | |
613 | return 0; | |
614 | } | |
615 | ||
17a37d48 PP |
616 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
617 | ||
883ed13e | 618 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 619 | { |
883ed13e | 620 | struct ui_file *file; |
d90e17a7 | 621 | const char *library; |
17a37d48 | 622 | |
f8708a14 | 623 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
624 | if (library == NULL) |
625 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 626 | |
883ed13e PA |
627 | /* If we'd print this to gdb_stdout when debug output is |
628 | disabled, still print it to gdb_stdout if debug output is | |
629 | enabled. User visible output should not depend on debug | |
630 | settings. */ | |
631 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
632 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
633 | library); | |
d90e17a7 | 634 | } |
17a37d48 | 635 | |
d90e17a7 PA |
636 | /* The thread library was detected. Activate the thread_db target |
637 | if this is the first process using it. */ | |
638 | if (thread_db_list->next == NULL) | |
639 | push_target (&thread_db_ops); | |
17a37d48 | 640 | |
d90e17a7 | 641 | return 1; |
17a37d48 PP |
642 | } |
643 | ||
644 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
645 | relative, or just LIBTHREAD_DB. */ | |
646 | ||
647 | static int | |
fde4f8ed | 648 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
649 | { |
650 | void *handle; | |
d90e17a7 | 651 | struct thread_db_info *info; |
17a37d48 | 652 | |
02d868e8 | 653 | if (libthread_db_debug) |
883ed13e PA |
654 | fprintf_unfiltered (gdb_stdlog, |
655 | _("Trying host libthread_db library: %s.\n"), | |
656 | library); | |
fde4f8ed JK |
657 | |
658 | if (check_auto_load_safe) | |
659 | { | |
660 | if (access (library, R_OK) != 0) | |
661 | { | |
662 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
663 | not exist at this place. */ | |
664 | if (libthread_db_debug) | |
883ed13e PA |
665 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
666 | safe_strerror (errno)); | |
fde4f8ed JK |
667 | return 0; |
668 | } | |
669 | ||
670 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
671 | "library \"%s\" from explicit " | |
672 | "directory.\n"), | |
673 | library)) | |
674 | return 0; | |
675 | } | |
676 | ||
17a37d48 PP |
677 | handle = dlopen (library, RTLD_NOW); |
678 | if (handle == NULL) | |
679 | { | |
02d868e8 | 680 | if (libthread_db_debug) |
883ed13e | 681 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
682 | return 0; |
683 | } | |
684 | ||
02d868e8 | 685 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
686 | { |
687 | void *td_init; | |
688 | ||
689 | td_init = dlsym (handle, "td_init"); | |
690 | if (td_init != NULL) | |
691 | { | |
692 | const char *const libpath = dladdr_to_soname (td_init); | |
693 | ||
694 | if (libpath != NULL) | |
883ed13e | 695 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
696 | library, libpath); |
697 | } | |
698 | } | |
699 | ||
d90e17a7 PA |
700 | info = add_thread_db_info (handle); |
701 | ||
bf88dd68 JK |
702 | /* Do not save system library name, that one is always trusted. */ |
703 | if (strchr (library, '/') != NULL) | |
14278e1f | 704 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 705 | |
d90e17a7 | 706 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
707 | return 1; |
708 | ||
709 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 710 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
711 | return 0; |
712 | } | |
713 | ||
290351b8 | 714 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
715 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
716 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
717 | The result is true for success. */ |
718 | ||
719 | static int | |
e6712ff1 | 720 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 721 | { |
4262abfb | 722 | const char *obj_name = objfile_name (obj); |
290351b8 | 723 | |
4262abfb | 724 | if (obj_name[0] != '/') |
290351b8 DE |
725 | { |
726 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 727 | " inferior, but got %s."), obj_name); |
290351b8 DE |
728 | return 0; |
729 | } | |
05386e9e | 730 | |
9b292f68 TT |
731 | std::string path = obj_name; |
732 | size_t cp = path.rfind ('/'); | |
05386e9e | 733 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
734 | gdb_assert (cp != std::string::npos); |
735 | path.resize (cp + 1); | |
e6712ff1 | 736 | if (subdir != NULL) |
9b292f68 TT |
737 | path = path + subdir + "/"; |
738 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 739 | |
9b292f68 | 740 | return try_thread_db_load (path.c_str (), 1); |
290351b8 DE |
741 | } |
742 | ||
98a5dd13 | 743 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
744 | Look for libthread_db in directory(libpthread)/SUBDIR. |
745 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
746 | The result is true for success. */ |
747 | ||
748 | static int | |
e6712ff1 | 749 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
750 | { |
751 | struct objfile *obj; | |
752 | ||
bf88dd68 JK |
753 | if (!auto_load_thread_db) |
754 | return 0; | |
755 | ||
98a5dd13 | 756 | ALL_OBJFILES (obj) |
4262abfb | 757 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 758 | { |
e6712ff1 | 759 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
760 | return 1; |
761 | ||
762 | /* We may have found the separate-debug-info version of | |
763 | libpthread, and it may live in a directory without a matching | |
764 | libthread_db. */ | |
765 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
766 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
767 | subdir); | |
290351b8 | 768 | |
98a5dd13 DE |
769 | return 0; |
770 | } | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
775 | /* Handle $sdir in libthread-db-search-path. | |
776 | Look for libthread_db in the system dirs, or wherever a plain | |
777 | dlopen(file_without_path) will look. | |
778 | The result is true for success. */ | |
779 | ||
780 | static int | |
781 | try_thread_db_load_from_sdir (void) | |
782 | { | |
fde4f8ed | 783 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
784 | } |
785 | ||
786 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
787 | The result is true for success. */ | |
788 | ||
789 | static int | |
790 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
791 | { | |
bf88dd68 JK |
792 | if (!auto_load_thread_db) |
793 | return 0; | |
794 | ||
9b292f68 | 795 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 796 | |
9b292f68 | 797 | return try_thread_db_load (path.c_str (), 1); |
98a5dd13 DE |
798 | } |
799 | ||
17a37d48 | 800 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
801 | to work on current inferior. |
802 | The result is true for success. */ | |
17a37d48 PP |
803 | |
804 | static int | |
805 | thread_db_load_search (void) | |
806 | { | |
e6712ff1 DE |
807 | VEC (char_ptr) *dir_vec; |
808 | struct cleanup *cleanups; | |
809 | char *this_dir; | |
810 | int i, rc = 0; | |
17a37d48 | 811 | |
e6712ff1 DE |
812 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
813 | cleanups = make_cleanup_free_char_ptr_vec (dir_vec); | |
814 | ||
815 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
17a37d48 | 816 | { |
e6712ff1 | 817 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 818 | size_t this_dir_len; |
e0881a8e | 819 | |
e6712ff1 | 820 | this_dir_len = strlen (this_dir); |
17a37d48 | 821 | |
e6712ff1 DE |
822 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
823 | && (this_dir[pdir_len] == '\0' | |
824 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 825 | { |
9b292f68 | 826 | const char *subdir = NULL; |
e6712ff1 | 827 | |
9b292f68 | 828 | std::string subdir_holder; |
e6712ff1 | 829 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 830 | { |
9b292f68 TT |
831 | subdir_holder = std::string (this_dir + pdir_len + 1); |
832 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 833 | } |
e6712ff1 | 834 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
835 | if (rc) |
836 | break; | |
17a37d48 | 837 | } |
e6712ff1 | 838 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
839 | { |
840 | if (try_thread_db_load_from_sdir ()) | |
841 | { | |
842 | rc = 1; | |
843 | break; | |
844 | } | |
845 | } | |
846 | else | |
17a37d48 | 847 | { |
98a5dd13 DE |
848 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
849 | { | |
850 | rc = 1; | |
851 | break; | |
852 | } | |
17a37d48 PP |
853 | } |
854 | } | |
98a5dd13 | 855 | |
e6712ff1 | 856 | do_cleanups (cleanups); |
98a5dd13 | 857 | if (libthread_db_debug) |
883ed13e PA |
858 | fprintf_unfiltered (gdb_stdlog, |
859 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
860 | return rc; |
861 | } | |
862 | ||
98a5dd13 DE |
863 | /* Return non-zero if the inferior has a libpthread. */ |
864 | ||
865 | static int | |
866 | has_libpthread (void) | |
867 | { | |
868 | struct objfile *obj; | |
869 | ||
870 | ALL_OBJFILES (obj) | |
4262abfb | 871 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
872 | return 1; |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
17a37d48 | 877 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 878 | Return 1 on success. */ |
17a37d48 PP |
879 | |
880 | static int | |
881 | thread_db_load (void) | |
882 | { | |
d90e17a7 | 883 | struct thread_db_info *info; |
17a37d48 | 884 | |
dfd4cc63 | 885 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
886 | |
887 | if (info != NULL) | |
17a37d48 PP |
888 | return 1; |
889 | ||
856d6f99 PA |
890 | /* Don't attempt to use thread_db on executables not running |
891 | yet. */ | |
892 | if (!target_has_registers) | |
17a37d48 PP |
893 | return 0; |
894 | ||
895 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 896 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
897 | return 0; |
898 | ||
899 | if (thread_db_load_search ()) | |
900 | return 1; | |
901 | ||
98a5dd13 DE |
902 | /* We couldn't find a libthread_db. |
903 | If the inferior has a libpthread warn the user. */ | |
904 | if (has_libpthread ()) | |
905 | { | |
906 | warning (_("Unable to find libthread_db matching inferior's thread" | |
907 | " library, thread debugging will not be available.")); | |
908 | return 0; | |
17a37d48 | 909 | } |
98a5dd13 | 910 | |
17a37d48 PP |
911 | /* Either this executable isn't using libpthread at all, or it is |
912 | statically linked. Since we can't easily distinguish these two cases, | |
913 | no warning is issued. */ | |
914 | return 0; | |
915 | } | |
916 | ||
fb0e1ba7 MK |
917 | static void |
918 | check_thread_signals (void) | |
919 | { | |
21bf60fe | 920 | if (!thread_signals) |
fb0e1ba7 MK |
921 | { |
922 | sigset_t mask; | |
923 | int i; | |
924 | ||
669211f5 | 925 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
926 | sigemptyset (&thread_stop_set); |
927 | sigemptyset (&thread_print_set); | |
928 | ||
b9569773 | 929 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
930 | { |
931 | if (sigismember (&mask, i)) | |
932 | { | |
2ea28649 | 933 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 934 | sigaddset (&thread_stop_set, i); |
2ea28649 | 935 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
936 | sigaddset (&thread_print_set, i); |
937 | thread_signals = 1; | |
938 | } | |
939 | } | |
940 | } | |
fb0e1ba7 MK |
941 | } |
942 | ||
0ec9a092 DJ |
943 | /* Check whether thread_db is usable. This function is called when |
944 | an inferior is created (or otherwise acquired, e.g. attached to) | |
945 | and when new shared libraries are loaded into a running process. */ | |
946 | ||
947 | void | |
948 | check_for_thread_db (void) | |
fb0e1ba7 | 949 | { |
b5057acd | 950 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 951 | if (!thread_db_load ()) |
b5057acd | 952 | return; |
0ec9a092 DJ |
953 | } |
954 | ||
0838fb57 DE |
955 | /* This function is called via the new_objfile observer. */ |
956 | ||
0ec9a092 DJ |
957 | static void |
958 | thread_db_new_objfile (struct objfile *objfile) | |
959 | { | |
d90e17a7 PA |
960 | /* This observer must always be called with inferior_ptid set |
961 | correctly. */ | |
962 | ||
0838fb57 | 963 | if (objfile != NULL |
fcb44371 | 964 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 965 | loaded (and notified without successful thread_db initialization) |
fcb44371 JK |
966 | the time observer_notify_new_objfile is called for the library itself. |
967 | Static executables have their separate debug info loaded already | |
968 | before the inferior has started. */ | |
969 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
970 | /* Only check for thread_db if we loaded libpthread, |
971 | or if this is the main symbol file. | |
972 | We need to check OBJF_MAINLINE to handle the case of debugging | |
973 | a statically linked executable AND the symbol file is specified AFTER | |
974 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
975 | For dynamically linked executables, libpthread can be near the end | |
976 | of the list of shared libraries to load, and in an app of several | |
977 | thousand shared libraries, this can otherwise be painful. */ | |
978 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 979 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 980 | check_for_thread_db (); |
fb0e1ba7 MK |
981 | } |
982 | ||
015de688 DC |
983 | static void |
984 | check_pid_namespace_match (void) | |
985 | { | |
986 | /* Check is only relevant for local targets targets. */ | |
987 | if (target_can_run (¤t_target)) | |
988 | { | |
989 | /* If the child is in a different PID namespace, its idea of its | |
990 | PID will differ from our idea of its PID. When we scan the | |
991 | child's thread list, we'll mistakenly think it has no threads | |
992 | since the thread PID fields won't match the PID we give to | |
993 | libthread_db. */ | |
9bc3a976 | 994 | if (!linux_ns_same (ptid_get_pid (inferior_ptid), LINUX_NS_PID)) |
015de688 DC |
995 | { |
996 | warning (_ ("Target and debugger are in different PID " | |
997 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
998 | "likely unreliable. " |
999 | "Connect to gdbserver inside the container.")); | |
015de688 | 1000 | } |
015de688 DC |
1001 | } |
1002 | } | |
1003 | ||
0838fb57 DE |
1004 | /* This function is called via the inferior_created observer. |
1005 | This handles the case of debugging statically linked executables. */ | |
1006 | ||
1007 | static void | |
1008 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1009 | { | |
015de688 | 1010 | check_pid_namespace_match (); |
0838fb57 DE |
1011 | check_for_thread_db (); |
1012 | } | |
1013 | ||
c1a747c1 PA |
1014 | /* Update the thread's state (what's displayed in "info threads"), |
1015 | from libthread_db thread state information. */ | |
1016 | ||
1017 | static void | |
7aabaf9d | 1018 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1019 | const td_thrinfo_t *ti_p) |
1020 | { | |
fe978cb0 PA |
1021 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1022 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1023 | } |
1024 | ||
2db9a427 | 1025 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1026 | private info. If TP is NULL or TP is marked as having exited, |
1027 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1028 | |
be550b6e | 1029 | static struct thread_info * |
2db9a427 PA |
1030 | record_thread (struct thread_db_info *info, |
1031 | struct thread_info *tp, | |
1032 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1033 | const td_thrinfo_t *ti_p) | |
1034 | { | |
2db9a427 PA |
1035 | /* A thread ID of zero may mean the thread library has not |
1036 | initialized yet. Leave private == NULL until the thread library | |
1037 | has initialized. */ | |
1038 | if (ti_p->ti_tid == 0) | |
be550b6e | 1039 | return tp; |
2db9a427 | 1040 | |
17faa917 | 1041 | /* Construct the thread's private data. */ |
7aabaf9d | 1042 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1043 | |
fe978cb0 PA |
1044 | priv->th = *th_p; |
1045 | priv->tid = ti_p->ti_tid; | |
1046 | update_thread_state (priv, ti_p); | |
17faa917 | 1047 | |
4eec2deb PA |
1048 | /* Add the thread to GDB's thread list. If we already know about a |
1049 | thread with this PTID, but it's marked exited, then the kernel | |
1050 | reused the tid of an old thread. */ | |
1051 | if (tp == NULL || tp->state == THREAD_EXITED) | |
fe978cb0 | 1052 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1053 | else |
7aabaf9d | 1054 | tp->priv.reset (priv); |
5365276c | 1055 | |
2db9a427 PA |
1056 | if (target_has_execution) |
1057 | check_thread_signals (); | |
be550b6e DE |
1058 | |
1059 | return tp; | |
fb0e1ba7 MK |
1060 | } |
1061 | ||
fb0e1ba7 | 1062 | static void |
6e1e1966 | 1063 | thread_db_detach (struct target_ops *ops, inferior *inf, int from_tty) |
fb0e1ba7 | 1064 | { |
117de6a9 | 1065 | struct target_ops *target_beneath = find_target_beneath (ops); |
c194fbe1 | 1066 | |
bc09b0c1 | 1067 | delete_thread_db_info (inf->pid); |
4105de34 | 1068 | |
6e1e1966 | 1069 | target_beneath->to_detach (target_beneath, inf, from_tty); |
d90e17a7 PA |
1070 | |
1071 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1072 | ||
1073 | /* If there are no more processes using libpthread, detach the | |
1074 | thread_db target ops. */ | |
1075 | if (!thread_db_list) | |
1076 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1077 | } |
1078 | ||
39f77062 | 1079 | static ptid_t |
117de6a9 | 1080 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1081 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1082 | int options) | |
fb0e1ba7 | 1083 | { |
d90e17a7 | 1084 | struct thread_db_info *info; |
117de6a9 PA |
1085 | struct target_ops *beneath = find_target_beneath (ops); |
1086 | ||
47608cb1 | 1087 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1088 | |
aa01bd36 PA |
1089 | switch (ourstatus->kind) |
1090 | { | |
1091 | case TARGET_WAITKIND_IGNORE: | |
1092 | case TARGET_WAITKIND_EXITED: | |
1093 | case TARGET_WAITKIND_THREAD_EXITED: | |
1094 | case TARGET_WAITKIND_SIGNALLED: | |
1095 | return ptid; | |
1096 | } | |
fb0e1ba7 | 1097 | |
dfd4cc63 | 1098 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1099 | |
1100 | /* If this process isn't using thread_db, we're done. */ | |
1101 | if (info == NULL) | |
1102 | return ptid; | |
1103 | ||
3f64f7b1 DJ |
1104 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1105 | { | |
d90e17a7 PA |
1106 | /* New image, it may or may not end up using thread_db. Assume |
1107 | not unless we find otherwise. */ | |
dfd4cc63 | 1108 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1109 | if (!thread_db_list) |
1110 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1111 | |
49fd4a42 | 1112 | return ptid; |
3f64f7b1 DJ |
1113 | } |
1114 | ||
2db9a427 PA |
1115 | /* Fill in the thread's user-level thread id and status. */ |
1116 | thread_from_lwp (ptid); | |
fb0e1ba7 | 1117 | |
b9b5d7ea | 1118 | return ptid; |
fb0e1ba7 MK |
1119 | } |
1120 | ||
fb0e1ba7 | 1121 | static void |
136d6dae | 1122 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1123 | { |
117de6a9 PA |
1124 | struct target_ops *target_beneath = find_target_beneath (ops); |
1125 | ||
dfd4cc63 | 1126 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1127 | |
d90e17a7 PA |
1128 | target_beneath->to_mourn_inferior (target_beneath); |
1129 | ||
b26a6851 | 1130 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1131 | if (!thread_db_list) |
1132 | unpush_target (ops); | |
fb0e1ba7 MK |
1133 | } |
1134 | ||
02c6c942 PP |
1135 | struct callback_data |
1136 | { | |
1137 | struct thread_db_info *info; | |
1138 | int new_threads; | |
1139 | }; | |
1140 | ||
fb0e1ba7 MK |
1141 | static int |
1142 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1143 | { | |
1144 | td_thrinfo_t ti; | |
1145 | td_err_e err; | |
39f77062 | 1146 | ptid_t ptid; |
403fe197 | 1147 | struct thread_info *tp; |
9a3c8263 | 1148 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1149 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1150 | |
d90e17a7 | 1151 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1152 | if (err != TD_OK) |
8a3fe4f8 | 1153 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1154 | thread_db_err_str (err)); |
fb0e1ba7 | 1155 | |
a33e3959 PA |
1156 | if (ti.ti_lid == -1) |
1157 | { | |
1158 | /* A thread with kernel thread ID -1 is either a thread that | |
1159 | exited and was joined, or a thread that is being created but | |
1160 | hasn't started yet, and that is reusing the tcb/stack of a | |
1161 | thread that previously exited and was joined. (glibc marks | |
1162 | terminated and joined threads with kernel thread ID -1. See | |
1163 | glibc PR17707. */ | |
d6c146e9 PA |
1164 | if (libthread_db_debug) |
1165 | fprintf_unfiltered (gdb_stdlog, | |
1166 | "thread_db: skipping exited and " | |
d41401ac DE |
1167 | "joined thread (0x%lx)\n", |
1168 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1169 | return 0; |
1170 | } | |
1171 | ||
254f582e | 1172 | if (ti.ti_tid == 0) |
4105de34 DJ |
1173 | { |
1174 | /* A thread ID of zero means that this is the main thread, but | |
1175 | glibc has not yet initialized thread-local storage and the | |
1176 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1177 | be yet. */ |
4105de34 | 1178 | |
4d062f1a PA |
1179 | /* In that case, we're not stopped in a fork syscall and don't |
1180 | need this glibc bug workaround. */ | |
1181 | info->need_stale_parent_threads_check = 0; | |
1182 | ||
4105de34 DJ |
1183 | return 0; |
1184 | } | |
1185 | ||
4d062f1a PA |
1186 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1187 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1188 | avoid doing the work if we know we don't have to. */ | |
1189 | if (info->need_stale_parent_threads_check) | |
1190 | { | |
1191 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1192 | |
4d062f1a PA |
1193 | if (tgid != -1 && tgid != info->pid) |
1194 | return 0; | |
1195 | } | |
1196 | ||
1197 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1198 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1199 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1200 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1201 | |
1202 | return 0; | |
1203 | } | |
1204 | ||
02c6c942 PP |
1205 | /* Helper for thread_db_find_new_threads_2. |
1206 | Returns number of new threads found. */ | |
1207 | ||
1208 | static int | |
1209 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1210 | td_err_e *errp) |
02c6c942 | 1211 | { |
02c6c942 | 1212 | struct callback_data data; |
fb169834 | 1213 | td_err_e err = TD_ERR; |
02c6c942 PP |
1214 | |
1215 | data.info = info; | |
1216 | data.new_threads = 0; | |
1217 | ||
2db9a427 | 1218 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1219 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1220 | |
492d29ea | 1221 | TRY |
02c6c942 PP |
1222 | { |
1223 | /* Iterate over all user-space threads to discover new threads. */ | |
1224 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1225 | find_new_threads_callback, | |
1226 | &data, | |
1227 | TD_THR_ANY_STATE, | |
1228 | TD_THR_LOWEST_PRIORITY, | |
1229 | TD_SIGNO_MASK, | |
1230 | TD_THR_ANY_USER_FLAGS); | |
1231 | } | |
6c63c96a | 1232 | CATCH (except, RETURN_MASK_ERROR) |
02c6c942 | 1233 | { |
6c63c96a | 1234 | if (libthread_db_debug) |
492d29ea PA |
1235 | { |
1236 | exception_fprintf (gdb_stdlog, except, | |
1237 | "Warning: find_new_threads_once: "); | |
1238 | } | |
6c63c96a PA |
1239 | } |
1240 | END_CATCH | |
02c6c942 | 1241 | |
6c63c96a PA |
1242 | if (libthread_db_debug) |
1243 | { | |
883ed13e PA |
1244 | fprintf_unfiltered (gdb_stdlog, |
1245 | _("Found %d new threads in iteration %d.\n"), | |
1246 | data.new_threads, iteration); | |
02c6c942 PP |
1247 | } |
1248 | ||
1249 | if (errp != NULL) | |
1250 | *errp = err; | |
1251 | ||
1252 | return data.new_threads; | |
1253 | } | |
1254 | ||
4c28f408 | 1255 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1256 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1257 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1258 | |
fb0e1ba7 | 1259 | static void |
02c6c942 | 1260 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1261 | { |
fcb44371 | 1262 | td_err_e err = TD_OK; |
d90e17a7 | 1263 | struct thread_db_info *info; |
02c6c942 | 1264 | int i, loop; |
4c28f408 | 1265 | |
dfd4cc63 | 1266 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1267 | |
4c28f408 | 1268 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1269 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1270 | |
1271 | if (until_no_new) | |
1272 | { | |
1273 | /* Require 4 successive iterations which do not find any new threads. | |
1274 | The 4 is a heuristic: there is an inherent race here, and I have | |
1275 | seen that 2 iterations in a row are not always sufficient to | |
1276 | "capture" all threads. */ | |
fcb44371 JK |
1277 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1278 | if (find_new_threads_once (info, i, &err) != 0) | |
1279 | { | |
1280 | /* Found some new threads. Restart the loop from beginning. */ | |
1281 | loop = -1; | |
1282 | } | |
02c6c942 PP |
1283 | } |
1284 | else | |
fcb44371 JK |
1285 | find_new_threads_once (info, 0, &err); |
1286 | ||
1287 | if (err != TD_OK) | |
1288 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1289 | } |
1290 | ||
02c6c942 PP |
1291 | static void |
1292 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1293 | { | |
1294 | thread_db_find_new_threads_2 (ptid, 0); | |
1295 | } | |
1296 | ||
a6904d5a PA |
1297 | /* Implement the to_update_thread_list target method for this |
1298 | target. */ | |
2db9a427 | 1299 | |
28439f5e | 1300 | static void |
a6904d5a | 1301 | thread_db_update_thread_list (struct target_ops *ops) |
28439f5e | 1302 | { |
d90e17a7 | 1303 | struct thread_db_info *info; |
c65b3e0d | 1304 | struct inferior *inf; |
d90e17a7 | 1305 | |
e8032dde PA |
1306 | prune_threads (); |
1307 | ||
c65b3e0d PA |
1308 | ALL_INFERIORS (inf) |
1309 | { | |
1310 | struct thread_info *thread; | |
d90e17a7 | 1311 | |
c65b3e0d PA |
1312 | if (inf->pid == 0) |
1313 | continue; | |
d90e17a7 | 1314 | |
c65b3e0d PA |
1315 | info = get_thread_db_info (inf->pid); |
1316 | if (info == NULL) | |
1317 | continue; | |
1318 | ||
1319 | thread = any_live_thread_of_process (inf->pid); | |
1320 | if (thread == NULL || thread->executing) | |
1321 | continue; | |
1322 | ||
a6904d5a PA |
1323 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1324 | data structures in the inferior's address space that may be | |
1325 | corrupted, or, if the target is running, the list may change | |
1326 | while we walk it. In the latter case, it's possible that a | |
1327 | thread exits just at the exact time that causes GDB to get | |
1328 | stuck in an infinite loop. To avoid pausing all threads | |
1329 | whenever the core wants to refresh the thread list, we | |
1330 | instead use thread_from_lwp immediately when we see an LWP | |
1331 | stop. That uses thread_db entry points that do not walk | |
1332 | libpthread's thread list, so should be safe, as well as more | |
1333 | efficient. */ | |
1334 | if (target_has_execution_1 (thread->ptid)) | |
1335 | continue; | |
1336 | ||
c65b3e0d PA |
1337 | thread_db_find_new_threads_1 (thread->ptid); |
1338 | } | |
2db9a427 | 1339 | |
a6904d5a PA |
1340 | /* Give the beneath target a chance to do extra processing. */ |
1341 | ops->beneath->to_update_thread_list (ops->beneath); | |
28439f5e PA |
1342 | } |
1343 | ||
7a114964 | 1344 | static const char * |
117de6a9 | 1345 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1346 | { |
e09875d4 | 1347 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1348 | struct target_ops *beneath; |
17faa917 | 1349 | |
fe978cb0 | 1350 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1351 | { |
1352 | static char buf[64]; | |
7aabaf9d | 1353 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1354 | |
17faa917 | 1355 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
7aabaf9d | 1356 | (unsigned long) priv->tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1357 | |
1358 | return buf; | |
1359 | } | |
1360 | ||
117de6a9 | 1361 | beneath = find_target_beneath (ops); |
e75fdfca | 1362 | return beneath->to_pid_to_str (beneath, ptid); |
fb0e1ba7 MK |
1363 | } |
1364 | ||
28b17333 DJ |
1365 | /* Return a string describing the state of the thread specified by |
1366 | INFO. */ | |
1367 | ||
7a114964 | 1368 | static const char * |
c15906d8 TT |
1369 | thread_db_extra_thread_info (struct target_ops *self, |
1370 | struct thread_info *info) | |
28b17333 | 1371 | { |
fe978cb0 | 1372 | if (info->priv == NULL) |
17faa917 DJ |
1373 | return NULL; |
1374 | ||
7aabaf9d SM |
1375 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1376 | ||
1377 | if (priv->dying) | |
28b17333 DJ |
1378 | return "Exiting"; |
1379 | ||
1380 | return NULL; | |
1381 | } | |
1382 | ||
e04ee09e KB |
1383 | /* Return pointer to the thread_info struct which corresponds to |
1384 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1385 | ||
1386 | static struct thread_info * | |
1387 | thread_db_thread_handle_to_thread_info (struct target_ops *ops, | |
1388 | const gdb_byte *thread_handle, | |
1389 | int handle_len, | |
1390 | struct inferior *inf) | |
1391 | { | |
1392 | struct thread_info *tp; | |
1393 | thread_t handle_tid; | |
1394 | ||
1395 | /* Thread handle sizes must match in order to proceed. We don't use an | |
1396 | assert here because the resulting internal error will cause GDB to | |
1397 | exit. This isn't necessarily an internal error due to the possibility | |
1398 | of garbage being passed as the thread handle via the python interface. */ | |
1399 | if (handle_len != sizeof (handle_tid)) | |
1400 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), | |
1401 | handle_len, sizeof (handle_tid)); | |
1402 | ||
1403 | handle_tid = * (const thread_t *) thread_handle; | |
1404 | ||
1405 | ALL_NON_EXITED_THREADS (tp) | |
1406 | { | |
7aabaf9d SM |
1407 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1408 | ||
1409 | if (tp->inf == inf && priv != NULL && handle_tid == priv->tid) | |
e04ee09e KB |
1410 | return tp; |
1411 | } | |
1412 | ||
1413 | return NULL; | |
1414 | } | |
1415 | ||
b2756930 KB |
1416 | /* Get the address of the thread local variable in load module LM which |
1417 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1418 | |
1419 | static CORE_ADDR | |
117de6a9 PA |
1420 | thread_db_get_thread_local_address (struct target_ops *ops, |
1421 | ptid_t ptid, | |
b2756930 | 1422 | CORE_ADDR lm, |
b4acd559 | 1423 | CORE_ADDR offset) |
3f47be5c | 1424 | { |
17faa917 | 1425 | struct thread_info *thread_info; |
117de6a9 | 1426 | struct target_ops *beneath; |
17faa917 | 1427 | |
17faa917 | 1428 | /* Find the matching thread. */ |
e09875d4 | 1429 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1430 | |
e0fd7c47 UW |
1431 | /* We may not have discovered the thread yet. */ |
1432 | if (thread_info != NULL && thread_info->priv == NULL) | |
be550b6e | 1433 | thread_info = thread_from_lwp (ptid); |
e0fd7c47 | 1434 | |
fe978cb0 | 1435 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1436 | { |
3f47be5c | 1437 | td_err_e err; |
00f515da | 1438 | psaddr_t address; |
7aabaf9d SM |
1439 | thread_db_info *info = get_thread_db_info (ptid_get_pid (ptid)); |
1440 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); | |
3f47be5c | 1441 | |
3f47be5c | 1442 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1443 | if (lm != 0) |
1444 | { | |
1445 | /* glibc doesn't provide the needed interface. */ | |
1446 | if (!info->td_thr_tls_get_addr_p) | |
1447 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1448 | _("No TLS library support")); | |
1449 | ||
1450 | /* Note the cast through uintptr_t: this interface only works if | |
1451 | a target address fits in a psaddr_t, which is a host pointer. | |
1452 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1453 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1454 | (psaddr_t)(uintptr_t) lm, |
1455 | offset, &address); | |
1456 | } | |
1457 | else | |
1458 | { | |
1459 | /* If glibc doesn't provide the needed interface throw an error | |
1460 | that LM is zero - normally cases it should not be. */ | |
1461 | if (!info->td_thr_tlsbase_p) | |
1462 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1463 | _("TLS load module not found")); | |
1464 | ||
1465 | /* This code path handles the case of -static -pthread executables: | |
1466 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1467 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1468 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1469 | The constant number 1 depends on GNU __libc_setup_tls | |
1470 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1471 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1472 | address = (char *) address + offset; |
1473 | } | |
3f47be5c EZ |
1474 | |
1475 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1476 | /* The memory hasn't been allocated, yet. */ | |
1477 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1478 | /* Now, if libthread_db provided the initialization image's |
1479 | address, we *could* try to build a non-lvalue value from | |
1480 | the initialization image. */ | |
109c3e39 AC |
1481 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1482 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1483 | #endif |
1484 | ||
1485 | /* Something else went wrong. */ | |
1486 | if (err != TD_OK) | |
109c3e39 AC |
1487 | throw_error (TLS_GENERIC_ERROR, |
1488 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1489 | |
1490 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1491 | /* Do proper sign extension for the target. */ |
1492 | gdb_assert (exec_bfd); | |
1493 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1494 | ? (CORE_ADDR) (intptr_t) address | |
1495 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1496 | } |
1497 | ||
117de6a9 | 1498 | beneath = find_target_beneath (ops); |
f0f9ff95 | 1499 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); |
3f47be5c EZ |
1500 | } |
1501 | ||
0ef643c8 JB |
1502 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1503 | ||
1504 | static ptid_t | |
1e6b91a4 | 1505 | thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) |
0ef643c8 | 1506 | { |
2db9a427 PA |
1507 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
1508 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
0ef643c8 JB |
1509 | } |
1510 | ||
4d062f1a PA |
1511 | static void |
1512 | thread_db_resume (struct target_ops *ops, | |
2ea28649 | 1513 | ptid_t ptid, int step, enum gdb_signal signo) |
4d062f1a PA |
1514 | { |
1515 | struct target_ops *beneath = find_target_beneath (ops); | |
1516 | struct thread_db_info *info; | |
1517 | ||
1518 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1519 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1520 | else |
dfd4cc63 | 1521 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1522 | |
1523 | /* This workaround is only needed for child fork lwps stopped in a | |
1524 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1525 | workaround can be disabled. */ | |
1526 | if (info) | |
1527 | info->need_stale_parent_threads_check = 0; | |
1528 | ||
1529 | beneath->to_resume (beneath, ptid, step, signo); | |
1530 | } | |
1531 | ||
9b292f68 | 1532 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1533 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1534 | PID, both in ascending order. */ | |
1535 | ||
9b292f68 TT |
1536 | static bool |
1537 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1538 | const struct thread_db_info *b) | |
bf88dd68 | 1539 | { |
bf88dd68 JK |
1540 | int retval; |
1541 | ||
1542 | retval = strcmp (a->filename, b->filename); | |
1543 | if (retval) | |
9b292f68 | 1544 | return retval < 0; |
bf88dd68 | 1545 | |
9b292f68 | 1546 | return a->pid < b->pid; |
bf88dd68 JK |
1547 | } |
1548 | ||
1549 | /* Implement 'info auto-load libthread-db'. */ | |
1550 | ||
1551 | static void | |
5fed81ff | 1552 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1553 | { |
1554 | struct ui_out *uiout = current_uiout; | |
1555 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1556 | struct thread_db_info *info; |
1557 | unsigned unique_filenames; | |
1558 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1559 | int i; |
1560 | ||
f1735a53 | 1561 | cs = skip_spaces (cs); |
bf88dd68 JK |
1562 | if (*cs) |
1563 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1564 | ||
9b292f68 | 1565 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1566 | for (info = thread_db_list; info; info = info->next) |
1567 | if (info->filename != NULL) | |
9b292f68 | 1568 | array.push_back (info); |
bf88dd68 JK |
1569 | |
1570 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1571 | std::sort (array.begin (), array.end (), |
1572 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1573 | |
1574 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1575 | length of PIDs list for the unique filenames (columns). */ | |
1576 | ||
1577 | unique_filenames = 0; | |
1578 | max_filename_len = 0; | |
bf88dd68 | 1579 | pids_len = 0; |
9b292f68 | 1580 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1581 | { |
1582 | int pid = array[i]->pid; | |
1583 | size_t this_pid_len; | |
1584 | ||
1585 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1586 | this_pid_len++; | |
1587 | ||
1588 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1589 | { | |
1590 | unique_filenames++; | |
325fac50 PA |
1591 | max_filename_len = std::max (max_filename_len, |
1592 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1593 | |
1594 | if (i > 0) | |
9b292f68 | 1595 | pids_len -= strlen (", "); |
bf88dd68 JK |
1596 | pids_len = 0; |
1597 | } | |
1598 | pids_len += this_pid_len + strlen (", "); | |
1599 | } | |
1600 | if (i) | |
9b292f68 | 1601 | pids_len -= strlen (", "); |
bf88dd68 JK |
1602 | |
1603 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1604 | its columns. */ | |
9b292f68 | 1605 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1606 | uiout->text ("\n"); |
bf88dd68 | 1607 | |
4a2b031d TT |
1608 | { |
1609 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1610 | "LinuxThreadDbTable"); | |
bf88dd68 | 1611 | |
4a2b031d TT |
1612 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1613 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1614 | uiout->table_body (); | |
bf88dd68 | 1615 | |
4a2b031d | 1616 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1617 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1618 | { |
1619 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1620 | |
4a2b031d TT |
1621 | info = array[i]; |
1622 | uiout->field_string ("filename", info->filename); | |
bf88dd68 | 1623 | |
9b292f68 TT |
1624 | std::string pids; |
1625 | while (i < array.size () && strcmp (info->filename, | |
1626 | array[i]->filename) == 0) | |
4a2b031d | 1627 | { |
9b292f68 TT |
1628 | if (!pids.empty ()) |
1629 | pids += ", "; | |
1630 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1631 | i++; |
1632 | } | |
bf88dd68 | 1633 | |
9b292f68 | 1634 | uiout->field_string ("pids", pids.c_str ()); |
bf88dd68 | 1635 | |
4a2b031d TT |
1636 | uiout->text ("\n"); |
1637 | } | |
1638 | } | |
bf88dd68 | 1639 | |
9b292f68 | 1640 | if (array.empty ()) |
112e8700 | 1641 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1642 | } |
1643 | ||
fb0e1ba7 MK |
1644 | static void |
1645 | init_thread_db_ops (void) | |
1646 | { | |
1647 | thread_db_ops.to_shortname = "multi-thread"; | |
1648 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1649 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1650 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1651 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1652 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1653 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
e8032dde | 1654 | thread_db_ops.to_update_thread_list = thread_db_update_thread_list; |
fb0e1ba7 MK |
1655 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
1656 | thread_db_ops.to_stratum = thread_stratum; | |
1657 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1658 | thread_db_ops.to_get_thread_local_address |
1659 | = thread_db_get_thread_local_address; | |
28b17333 | 1660 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1661 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
e04ee09e | 1662 | thread_db_ops.to_thread_handle_to_thread_info = thread_db_thread_handle_to_thread_info; |
fb0e1ba7 | 1663 | thread_db_ops.to_magic = OPS_MAGIC; |
c22a2b88 TT |
1664 | |
1665 | complete_target_initialization (&thread_db_ops); | |
fb0e1ba7 MK |
1666 | } |
1667 | ||
1668 | void | |
1669 | _initialize_thread_db (void) | |
1670 | { | |
17a37d48 | 1671 | init_thread_db_ops (); |
17a37d48 PP |
1672 | |
1673 | /* Defer loading of libthread_db.so until inferior is running. | |
1674 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1675 | executable -- there could be multiple versions of glibc, |
1676 | and until there is a running inferior, we can't tell which | |
1677 | libthread_db is the correct one to load. */ | |
17a37d48 PP |
1678 | |
1679 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1680 | ||
1681 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1682 | class_support, | |
1683 | &libthread_db_search_path, _("\ | |
1684 | Set search path for libthread_db."), _("\ | |
1685 | Show the current search path or libthread_db."), _("\ | |
1686 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1687 | gdb itself.\n\ |
1688 | Its value is a colon (':') separate list of directories to search.\n\ | |
1689 | Setting the search path to an empty list resets it to its default value."), | |
1690 | set_libthread_db_search_path, | |
17a37d48 PP |
1691 | NULL, |
1692 | &setlist, &showlist); | |
02d868e8 | 1693 | |
ccce17b0 YQ |
1694 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1695 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1696 | Set libthread-db debugging."), _("\ |
1697 | Show libthread-db debugging."), _("\ | |
1698 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
1699 | NULL, |
1700 | show_libthread_db_debug, | |
1701 | &setdebuglist, &showdebuglist); | |
02d868e8 | 1702 | |
bf88dd68 JK |
1703 | add_setshow_boolean_cmd ("libthread-db", class_support, |
1704 | &auto_load_thread_db, _("\ | |
1705 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
1706 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
1707 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
1708 | locations to load libthread_db compatible with the inferior.\n\ | |
1709 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
1710 | This options has security implications for untrusted inferiors."), | |
1711 | NULL, show_auto_load_thread_db, | |
1712 | auto_load_set_cmdlist_get (), | |
1713 | auto_load_show_cmdlist_get ()); | |
1714 | ||
1715 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
1716 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
1717 | Usage: info auto-load libthread-db"), | |
1718 | auto_load_info_cmdlist_get ()); | |
1719 | ||
17a37d48 PP |
1720 | /* Add ourselves to objfile event chain. */ |
1721 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
1722 | |
1723 | /* Add ourselves to inferior_created event chain. | |
1724 | This is needed to handle debugging statically linked programs where | |
1725 | the new_objfile observer won't get called for libpthread. */ | |
1726 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 1727 | } |