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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" |
76727919 | 38 | #include "observable.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 | ||
d9f719f1 PA |
78 | static const target_info thread_db_target_info = { |
79 | "multi-thread", | |
80 | N_("multi-threaded child process."), | |
81 | N_("Threads and pthreads support.") | |
82 | }; | |
83 | ||
f6ac5f3d PA |
84 | class thread_db_target final : public target_ops |
85 | { | |
86 | public: | |
87 | thread_db_target (); | |
88 | ||
d9f719f1 PA |
89 | const target_info &info () const override |
90 | { return thread_db_target_info; } | |
f6ac5f3d PA |
91 | |
92 | void detach (inferior *, int) override; | |
93 | ptid_t wait (ptid_t, struct target_waitstatus *, int) override; | |
94 | void resume (ptid_t, int, enum gdb_signal) override; | |
95 | void mourn_inferior () override; | |
96 | void update_thread_list () override; | |
97 | const char *pid_to_str (ptid_t) override; | |
98 | CORE_ADDR get_thread_local_address (ptid_t ptid, | |
99 | CORE_ADDR load_module_addr, | |
100 | CORE_ADDR offset) override; | |
101 | const char *extra_thread_info (struct thread_info *) override; | |
102 | ptid_t get_ada_task_ptid (long lwp, long thread) override; | |
103 | ||
104 | thread_info *thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
105 | int handle_len, | |
106 | inferior *inf) override; | |
107 | }; | |
108 | ||
109 | thread_db_target::thread_db_target () | |
110 | { | |
111 | this->to_stratum = thread_stratum; | |
112 | } | |
113 | ||
17a37d48 PP |
114 | static char *libthread_db_search_path; |
115 | ||
bf88dd68 JK |
116 | /* Set to non-zero if thread_db auto-loading is enabled |
117 | by the "set auto-load libthread-db" command. */ | |
118 | static int auto_load_thread_db = 1; | |
119 | ||
120 | /* "show" command for the auto_load_thread_db configuration variable. */ | |
121 | ||
122 | static void | |
123 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
124 | struct cmd_list_element *c, const char *value) | |
125 | { | |
126 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
127 | "is %s.\n"), | |
128 | value); | |
129 | } | |
130 | ||
84e578fb | 131 | static void |
eb4c3f4a | 132 | set_libthread_db_search_path (const char *ignored, int from_tty, |
84e578fb DE |
133 | struct cmd_list_element *c) |
134 | { | |
135 | if (*libthread_db_search_path == '\0') | |
136 | { | |
137 | xfree (libthread_db_search_path); | |
138 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
139 | } | |
140 | } | |
141 | ||
02d868e8 PP |
142 | /* If non-zero, print details of libthread_db processing. */ |
143 | ||
ccce17b0 | 144 | static unsigned int libthread_db_debug; |
02d868e8 PP |
145 | |
146 | static void | |
147 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
148 | struct cmd_list_element *c, const char *value) | |
149 | { | |
150 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
151 | } | |
152 | ||
8605d56e AC |
153 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
154 | threads. */ | |
fb0e1ba7 | 155 | |
fb0e1ba7 | 156 | /* This module's target vector. */ |
f6ac5f3d | 157 | static thread_db_target the_thread_db_target; |
fb0e1ba7 | 158 | |
fb0e1ba7 MK |
159 | /* Non-zero if we have determined the signals used by the threads |
160 | library. */ | |
161 | static int thread_signals; | |
162 | static sigset_t thread_stop_set; | |
163 | static sigset_t thread_print_set; | |
164 | ||
d90e17a7 PA |
165 | struct thread_db_info |
166 | { | |
167 | struct thread_db_info *next; | |
168 | ||
169 | /* Process id this object refers to. */ | |
170 | int pid; | |
171 | ||
172 | /* Handle from dlopen for libthread_db.so. */ | |
173 | void *handle; | |
174 | ||
bf88dd68 JK |
175 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
176 | HANDLE. It may be NULL for system library. */ | |
177 | char *filename; | |
178 | ||
d90e17a7 PA |
179 | /* Structure that identifies the child process for the |
180 | <proc_service.h> interface. */ | |
181 | struct ps_prochandle proc_handle; | |
182 | ||
183 | /* Connection to the libthread_db library. */ | |
184 | td_thragent_t *thread_agent; | |
185 | ||
4d062f1a PA |
186 | /* True if we need to apply the workaround for glibc/BZ5983. When |
187 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
188 | list, nptl_db returns the parent's threads in addition to the new | |
189 | (single) child thread. If this flag is set, we do extra work to | |
190 | be able to ignore such stale entries. */ | |
191 | int need_stale_parent_threads_check; | |
192 | ||
d90e17a7 | 193 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 194 | |
96e9210f PA |
195 | td_init_ftype *td_init_p; |
196 | td_ta_new_ftype *td_ta_new_p; | |
197 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; | |
198 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f | 199 | td_thr_get_info_ftype *td_thr_get_info_p; |
96e9210f PA |
200 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
201 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
202 | }; |
203 | ||
204 | /* List of known processes using thread_db, and the required | |
205 | bookkeeping. */ | |
206 | struct thread_db_info *thread_db_list; | |
207 | ||
208 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 209 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 | 210 | |
2db9a427 PA |
211 | static void check_thread_signals (void); |
212 | ||
be550b6e DE |
213 | static struct thread_info *record_thread |
214 | (struct thread_db_info *info, struct thread_info *tp, | |
215 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 216 | |
d90e17a7 PA |
217 | /* Add the current inferior to the list of processes using libpthread. |
218 | Return a pointer to the newly allocated object that was added to | |
219 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
220 | LIBTHREAD_DB_SO. */ | |
221 | ||
222 | static struct thread_db_info * | |
223 | add_thread_db_info (void *handle) | |
224 | { | |
8d749320 | 225 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 226 | |
d90e17a7 PA |
227 | info->pid = ptid_get_pid (inferior_ptid); |
228 | info->handle = handle; | |
856d6f99 PA |
229 | |
230 | /* The workaround works by reading from /proc/pid/status, so it is | |
231 | disabled for core files. */ | |
232 | if (target_has_execution) | |
233 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
234 | |
235 | info->next = thread_db_list; | |
236 | thread_db_list = info; | |
237 | ||
238 | return info; | |
239 | } | |
240 | ||
241 | /* Return the thread_db_info object representing the bookkeeping | |
242 | related to process PID, if any; NULL otherwise. */ | |
243 | ||
244 | static struct thread_db_info * | |
245 | get_thread_db_info (int pid) | |
246 | { | |
247 | struct thread_db_info *info; | |
248 | ||
249 | for (info = thread_db_list; info; info = info->next) | |
250 | if (pid == info->pid) | |
251 | return info; | |
252 | ||
253 | return NULL; | |
254 | } | |
255 | ||
256 | /* When PID has exited or has been detached, we no longer want to keep | |
257 | track of it as using libpthread. Call this function to discard | |
258 | thread_db related info related to PID. Note that this closes | |
259 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
260 | ||
261 | static void | |
262 | delete_thread_db_info (int pid) | |
263 | { | |
264 | struct thread_db_info *info, *info_prev; | |
265 | ||
266 | info_prev = NULL; | |
267 | ||
268 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
269 | if (pid == info->pid) | |
270 | break; | |
271 | ||
272 | if (info == NULL) | |
273 | return; | |
274 | ||
275 | if (info->handle != NULL) | |
276 | dlclose (info->handle); | |
277 | ||
bf88dd68 JK |
278 | xfree (info->filename); |
279 | ||
d90e17a7 PA |
280 | if (info_prev) |
281 | info_prev->next = info->next; | |
282 | else | |
283 | thread_db_list = info->next; | |
284 | ||
285 | xfree (info); | |
286 | } | |
fb0e1ba7 | 287 | |
5365276c DJ |
288 | /* Use "struct private_thread_info" to cache thread state. This is |
289 | a substantial optimization. */ | |
290 | ||
7aabaf9d | 291 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 292 | { |
a2f23071 | 293 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 294 | bool dying = false; |
a2f23071 | 295 | |
5365276c | 296 | /* Cached thread state. */ |
7aabaf9d SM |
297 | td_thrhandle_t th {}; |
298 | thread_t tid {}; | |
fb0e1ba7 | 299 | }; |
7aabaf9d SM |
300 | |
301 | static thread_db_thread_info * | |
302 | get_thread_db_thread_info (thread_info *thread) | |
303 | { | |
304 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
305 | } | |
21bf60fe | 306 | |
a121b7c1 | 307 | static const char * |
fb0e1ba7 MK |
308 | thread_db_err_str (td_err_e err) |
309 | { | |
310 | static char buf[64]; | |
311 | ||
312 | switch (err) | |
313 | { | |
314 | case TD_OK: | |
315 | return "generic 'call succeeded'"; | |
316 | case TD_ERR: | |
317 | return "generic error"; | |
318 | case TD_NOTHR: | |
319 | return "no thread to satisfy query"; | |
320 | case TD_NOSV: | |
321 | return "no sync handle to satisfy query"; | |
322 | case TD_NOLWP: | |
323 | return "no LWP to satisfy query"; | |
324 | case TD_BADPH: | |
325 | return "invalid process handle"; | |
326 | case TD_BADTH: | |
327 | return "invalid thread handle"; | |
328 | case TD_BADSH: | |
329 | return "invalid synchronization handle"; | |
330 | case TD_BADTA: | |
331 | return "invalid thread agent"; | |
332 | case TD_BADKEY: | |
333 | return "invalid key"; | |
334 | case TD_NOMSG: | |
335 | return "no event message for getmsg"; | |
336 | case TD_NOFPREGS: | |
337 | return "FPU register set not available"; | |
338 | case TD_NOLIBTHREAD: | |
339 | return "application not linked with libthread"; | |
340 | case TD_NOEVENT: | |
341 | return "requested event is not supported"; | |
342 | case TD_NOCAPAB: | |
343 | return "capability not available"; | |
344 | case TD_DBERR: | |
345 | return "debugger service failed"; | |
346 | case TD_NOAPLIC: | |
347 | return "operation not applicable to"; | |
348 | case TD_NOTSD: | |
349 | return "no thread-specific data for this thread"; | |
350 | case TD_MALLOC: | |
351 | return "malloc failed"; | |
352 | case TD_PARTIALREG: | |
353 | return "only part of register set was written/read"; | |
354 | case TD_NOXREGS: | |
355 | return "X register set not available for this thread"; | |
59f80f10 DJ |
356 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
357 | case TD_NOTALLOC: | |
358 | return "thread has not yet allocated TLS for given module"; | |
359 | #endif | |
360 | #ifdef THREAD_DB_HAS_TD_VERSION | |
361 | case TD_VERSION: | |
362 | return "versions of libpthread and libthread_db do not match"; | |
363 | #endif | |
364 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
365 | case TD_NOTLS: | |
366 | return "there is no TLS segment in the given module"; | |
367 | #endif | |
fb0e1ba7 MK |
368 | default: |
369 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
370 | return buf; | |
371 | } | |
372 | } | |
4105de34 | 373 | |
64776a0b | 374 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 375 | |
be550b6e | 376 | static struct thread_info * |
39f77062 | 377 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 378 | { |
fb0e1ba7 | 379 | td_thrhandle_t th; |
2db9a427 | 380 | td_thrinfo_t ti; |
fb0e1ba7 | 381 | td_err_e err; |
d90e17a7 | 382 | struct thread_db_info *info; |
2db9a427 | 383 | struct thread_info *tp; |
fb0e1ba7 | 384 | |
6cb9b55b PP |
385 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
386 | th.th_unique = 0; | |
387 | ||
17faa917 DJ |
388 | /* This ptid comes from linux-nat.c, which should always fill in the |
389 | LWP. */ | |
dfd4cc63 | 390 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 391 | |
dfd4cc63 | 392 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 393 | |
4c28f408 | 394 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 395 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
396 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
397 | &th); | |
fb0e1ba7 | 398 | if (err != TD_OK) |
8a3fe4f8 | 399 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 400 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 401 | |
2db9a427 PA |
402 | err = info->td_thr_get_info_p (&th, &ti); |
403 | if (err != TD_OK) | |
404 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
405 | thread_db_err_str (err)); | |
406 | ||
407 | /* Fill the cache. */ | |
408 | tp = find_thread_ptid (ptid); | |
be550b6e | 409 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
410 | } |
411 | \f | |
412 | ||
2db9a427 PA |
413 | /* See linux-nat.h. */ |
414 | ||
4c28f408 | 415 | int |
2db9a427 | 416 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 417 | { |
d90e17a7 | 418 | struct thread_db_info *info; |
4c28f408 | 419 | |
2db9a427 | 420 | info = get_thread_db_info (ptid_get_pid (child)); |
d90e17a7 PA |
421 | |
422 | if (info == NULL) | |
4c28f408 PA |
423 | return 0; |
424 | ||
2db9a427 | 425 | thread_from_lwp (child); |
4c28f408 | 426 | |
2db9a427 PA |
427 | /* If we do not know about the main thread yet, this would be a good |
428 | time to find it. */ | |
429 | thread_from_lwp (parent); | |
4c28f408 PA |
430 | return 1; |
431 | } | |
432 | ||
5220ea4c AC |
433 | static void * |
434 | verbose_dlsym (void *handle, const char *name) | |
435 | { | |
436 | void *sym = dlsym (handle, name); | |
437 | if (sym == NULL) | |
3e43a32a MS |
438 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
439 | name, dlerror ()); | |
5220ea4c AC |
440 | return sym; |
441 | } | |
442 | ||
fcb44371 JK |
443 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
444 | return 1 if this version is lower (and not equal) to | |
445 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
446 | ||
447 | static int | |
448 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
449 | { | |
3b7344d5 | 450 | struct bound_minimal_symbol version_msym; |
fcb44371 | 451 | CORE_ADDR version_addr; |
e83e4e24 | 452 | gdb::unique_xmalloc_ptr<char> version; |
fcb44371 JK |
453 | int err, got, retval = 0; |
454 | ||
455 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 456 | if (version_msym.minsym == NULL) |
fcb44371 JK |
457 | return 0; |
458 | ||
77e371c0 | 459 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 | 460 | got = target_read_string (version_addr, &version, 32, &err); |
e83e4e24 | 461 | if (err == 0 && memchr (version.get (), 0, got) == version.get () + got - 1) |
fcb44371 JK |
462 | { |
463 | int major, minor; | |
464 | ||
e83e4e24 | 465 | retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2 |
fcb44371 JK |
466 | && (major < ver_major_min |
467 | || (major == ver_major_min && minor < ver_minor_min))); | |
468 | } | |
fcb44371 JK |
469 | |
470 | return retval; | |
471 | } | |
472 | ||
fcb44371 JK |
473 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
474 | if appropriate. | |
456b0e24 | 475 | |
fcb44371 JK |
476 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
477 | otherwise. */ | |
478 | ||
479 | static int | |
456b0e24 PP |
480 | thread_db_find_new_threads_silently (ptid_t ptid) |
481 | { | |
456b0e24 | 482 | |
492d29ea | 483 | TRY |
456b0e24 | 484 | { |
02c6c942 | 485 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
486 | } |
487 | ||
492d29ea | 488 | CATCH (except, RETURN_MASK_ERROR) |
e0881a8e | 489 | { |
fcb44371 | 490 | if (libthread_db_debug) |
883ed13e | 491 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
492 | "Warning: thread_db_find_new_threads_silently: "); |
493 | ||
494 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
495 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
496 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
497 | executables if td_thr_get_info is called before glibc has initialized | |
498 | itself. | |
499 | ||
500 | If the nptl bug is NOT present in the inferior and still thread_db | |
501 | reports an error return 1. It means the inferior has corrupted thread | |
502 | list and GDB should fall back only to LWPs. | |
503 | ||
504 | If the nptl bug is present in the inferior return 0 to silently ignore | |
505 | such errors, and let gdb enumerate threads again later. In such case | |
506 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
507 | corrupted. For core files it does not apply, no 'later enumeration' |
508 | is possible. */ | |
fcb44371 | 509 | |
889003ed | 510 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
511 | { |
512 | exception_fprintf (gdb_stderr, except, | |
513 | _("Warning: couldn't activate thread debugging " | |
514 | "using libthread_db: ")); | |
515 | return 1; | |
516 | } | |
e0881a8e | 517 | } |
492d29ea PA |
518 | END_CATCH |
519 | ||
fcb44371 | 520 | return 0; |
456b0e24 PP |
521 | } |
522 | ||
d90e17a7 PA |
523 | /* Lookup a library in which given symbol resides. |
524 | Note: this is looking in GDB process, not in the inferior. | |
525 | Returns library name, or NULL. */ | |
526 | ||
527 | static const char * | |
528 | dladdr_to_soname (const void *addr) | |
529 | { | |
530 | Dl_info info; | |
531 | ||
532 | if (dladdr (addr, &info) != 0) | |
533 | return info.dli_fname; | |
534 | return NULL; | |
535 | } | |
536 | ||
2471d008 | 537 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
538 | Return 1 on success. |
539 | Failure could happen if libthread_db does not have symbols we expect, | |
540 | or when it refuses to work with the current inferior (e.g. due to | |
541 | version mismatch between libthread_db and libpthread). */ | |
542 | ||
543 | static int | |
d90e17a7 | 544 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
545 | { |
546 | td_err_e err; | |
547 | ||
548 | /* Initialize pointers to the dynamic library functions we will use. | |
549 | Essential functions first. */ | |
550 | ||
96e9210f PA |
551 | #define TDB_VERBOSE_DLSYM(info, func) \ |
552 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
553 | ||
554 | #define TDB_DLSYM(info, func) \ | |
555 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
556 | ||
557 | #define CHK(a) \ | |
558 | do \ | |
559 | { \ | |
560 | if ((a) == NULL) \ | |
561 | return 0; \ | |
562 | } while (0) | |
563 | ||
564 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 565 | |
d90e17a7 | 566 | err = info->td_init_p (); |
17a37d48 PP |
567 | if (err != TD_OK) |
568 | { | |
3e43a32a MS |
569 | warning (_("Cannot initialize libthread_db: %s"), |
570 | thread_db_err_str (err)); | |
17a37d48 PP |
571 | return 0; |
572 | } | |
573 | ||
96e9210f | 574 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
575 | |
576 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 577 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
578 | |
579 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 580 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
581 | if (err != TD_OK) |
582 | { | |
02d868e8 | 583 | if (libthread_db_debug) |
883ed13e PA |
584 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
585 | thread_db_err_str (err)); | |
17a37d48 PP |
586 | else |
587 | switch (err) | |
588 | { | |
589 | case TD_NOLIBTHREAD: | |
590 | #ifdef THREAD_DB_HAS_TD_VERSION | |
591 | case TD_VERSION: | |
592 | #endif | |
593 | /* The errors above are not unexpected and silently ignored: | |
594 | they just mean we haven't found correct version of | |
595 | libthread_db yet. */ | |
596 | break; | |
597 | default: | |
598 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
599 | } | |
600 | return 0; | |
601 | } | |
602 | ||
96e9210f PA |
603 | /* These are essential. */ |
604 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
96e9210f | 605 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); |
17a37d48 PP |
606 | |
607 | /* These are not essential. */ | |
96e9210f PA |
608 | TDB_DLSYM (info, td_thr_tls_get_addr); |
609 | TDB_DLSYM (info, td_thr_tlsbase); | |
610 | ||
2db9a427 PA |
611 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
612 | structures in the inferior's address space that may be corrupted, | |
613 | or, if the target is running, may change while we walk them. If | |
614 | there's execution (and /proc is mounted), then we're already | |
615 | attached to all LWPs. Use thread_from_lwp, which uses | |
616 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
617 | ||
618 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
619 | currently on core targets, as it uses ptrace directly. */ | |
620 | if (target_has_execution | |
621 | && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid))) | |
1eb2dbb8 PA |
622 | info->td_ta_thr_iter_p = NULL; |
623 | else | |
624 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
625 | ||
626 | #undef TDB_VERBOSE_DLSYM | |
627 | #undef TDB_DLSYM | |
628 | #undef CHK | |
629 | ||
630 | if (info->td_ta_thr_iter_p == NULL) | |
2db9a427 PA |
631 | { |
632 | struct lwp_info *lp; | |
633 | int pid = ptid_get_pid (inferior_ptid); | |
634 | ||
635 | linux_stop_and_wait_all_lwps (); | |
636 | ||
637 | ALL_LWPS (lp) | |
638 | if (ptid_get_pid (lp->ptid) == pid) | |
639 | thread_from_lwp (lp->ptid); | |
640 | ||
641 | linux_unstop_all_lwps (); | |
642 | } | |
643 | else if (thread_db_find_new_threads_silently (inferior_ptid) != 0) | |
fcb44371 JK |
644 | { |
645 | /* Even if libthread_db initializes, if the thread list is | |
646 | corrupted, we'd not manage to list any threads. Better reject this | |
647 | thread_db, and fall back to at least listing LWPs. */ | |
648 | return 0; | |
649 | } | |
650 | ||
17a37d48 PP |
651 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
652 | ||
883ed13e | 653 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 654 | { |
883ed13e | 655 | struct ui_file *file; |
d90e17a7 | 656 | const char *library; |
17a37d48 | 657 | |
f8708a14 | 658 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
659 | if (library == NULL) |
660 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 661 | |
883ed13e PA |
662 | /* If we'd print this to gdb_stdout when debug output is |
663 | disabled, still print it to gdb_stdout if debug output is | |
664 | enabled. User visible output should not depend on debug | |
665 | settings. */ | |
666 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
667 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
668 | library); | |
d90e17a7 | 669 | } |
17a37d48 | 670 | |
d90e17a7 PA |
671 | /* The thread library was detected. Activate the thread_db target |
672 | if this is the first process using it. */ | |
673 | if (thread_db_list->next == NULL) | |
f6ac5f3d | 674 | push_target (&the_thread_db_target); |
17a37d48 | 675 | |
d90e17a7 | 676 | return 1; |
17a37d48 PP |
677 | } |
678 | ||
679 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
680 | relative, or just LIBTHREAD_DB. */ | |
681 | ||
682 | static int | |
fde4f8ed | 683 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
684 | { |
685 | void *handle; | |
d90e17a7 | 686 | struct thread_db_info *info; |
17a37d48 | 687 | |
02d868e8 | 688 | if (libthread_db_debug) |
883ed13e PA |
689 | fprintf_unfiltered (gdb_stdlog, |
690 | _("Trying host libthread_db library: %s.\n"), | |
691 | library); | |
fde4f8ed JK |
692 | |
693 | if (check_auto_load_safe) | |
694 | { | |
695 | if (access (library, R_OK) != 0) | |
696 | { | |
697 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
698 | not exist at this place. */ | |
699 | if (libthread_db_debug) | |
883ed13e PA |
700 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
701 | safe_strerror (errno)); | |
fde4f8ed JK |
702 | return 0; |
703 | } | |
704 | ||
705 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
706 | "library \"%s\" from explicit " | |
707 | "directory.\n"), | |
708 | library)) | |
709 | return 0; | |
710 | } | |
711 | ||
17a37d48 PP |
712 | handle = dlopen (library, RTLD_NOW); |
713 | if (handle == NULL) | |
714 | { | |
02d868e8 | 715 | if (libthread_db_debug) |
883ed13e | 716 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
717 | return 0; |
718 | } | |
719 | ||
02d868e8 | 720 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
721 | { |
722 | void *td_init; | |
723 | ||
724 | td_init = dlsym (handle, "td_init"); | |
725 | if (td_init != NULL) | |
726 | { | |
727 | const char *const libpath = dladdr_to_soname (td_init); | |
728 | ||
729 | if (libpath != NULL) | |
883ed13e | 730 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
731 | library, libpath); |
732 | } | |
733 | } | |
734 | ||
d90e17a7 PA |
735 | info = add_thread_db_info (handle); |
736 | ||
bf88dd68 JK |
737 | /* Do not save system library name, that one is always trusted. */ |
738 | if (strchr (library, '/') != NULL) | |
14278e1f | 739 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 740 | |
d90e17a7 | 741 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
742 | return 1; |
743 | ||
744 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 745 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
746 | return 0; |
747 | } | |
748 | ||
290351b8 | 749 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
750 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
751 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
752 | The result is true for success. */ |
753 | ||
754 | static int | |
e6712ff1 | 755 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 756 | { |
4262abfb | 757 | const char *obj_name = objfile_name (obj); |
290351b8 | 758 | |
4262abfb | 759 | if (obj_name[0] != '/') |
290351b8 DE |
760 | { |
761 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 762 | " inferior, but got %s."), obj_name); |
290351b8 DE |
763 | return 0; |
764 | } | |
05386e9e | 765 | |
9b292f68 TT |
766 | std::string path = obj_name; |
767 | size_t cp = path.rfind ('/'); | |
05386e9e | 768 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
769 | gdb_assert (cp != std::string::npos); |
770 | path.resize (cp + 1); | |
e6712ff1 | 771 | if (subdir != NULL) |
9b292f68 TT |
772 | path = path + subdir + "/"; |
773 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 774 | |
9b292f68 | 775 | return try_thread_db_load (path.c_str (), 1); |
290351b8 DE |
776 | } |
777 | ||
98a5dd13 | 778 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
779 | Look for libthread_db in directory(libpthread)/SUBDIR. |
780 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
781 | The result is true for success. */ |
782 | ||
783 | static int | |
e6712ff1 | 784 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
785 | { |
786 | struct objfile *obj; | |
787 | ||
bf88dd68 JK |
788 | if (!auto_load_thread_db) |
789 | return 0; | |
790 | ||
98a5dd13 | 791 | ALL_OBJFILES (obj) |
4262abfb | 792 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 793 | { |
e6712ff1 | 794 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
795 | return 1; |
796 | ||
797 | /* We may have found the separate-debug-info version of | |
798 | libpthread, and it may live in a directory without a matching | |
799 | libthread_db. */ | |
800 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
801 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
802 | subdir); | |
290351b8 | 803 | |
98a5dd13 DE |
804 | return 0; |
805 | } | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
810 | /* Handle $sdir in libthread-db-search-path. | |
811 | Look for libthread_db in the system dirs, or wherever a plain | |
812 | dlopen(file_without_path) will look. | |
813 | The result is true for success. */ | |
814 | ||
815 | static int | |
816 | try_thread_db_load_from_sdir (void) | |
817 | { | |
fde4f8ed | 818 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
819 | } |
820 | ||
821 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
822 | The result is true for success. */ | |
823 | ||
824 | static int | |
825 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
826 | { | |
bf88dd68 JK |
827 | if (!auto_load_thread_db) |
828 | return 0; | |
829 | ||
9b292f68 | 830 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 831 | |
9b292f68 | 832 | return try_thread_db_load (path.c_str (), 1); |
98a5dd13 DE |
833 | } |
834 | ||
17a37d48 | 835 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
836 | to work on current inferior. |
837 | The result is true for success. */ | |
17a37d48 PP |
838 | |
839 | static int | |
840 | thread_db_load_search (void) | |
841 | { | |
e80aaf61 | 842 | int rc = 0; |
17a37d48 | 843 | |
e80aaf61 SM |
844 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
845 | = dirnames_to_char_ptr_vec (libthread_db_search_path); | |
e6712ff1 | 846 | |
e80aaf61 | 847 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
17a37d48 | 848 | { |
e80aaf61 | 849 | const char *this_dir = this_dir_up.get (); |
e6712ff1 | 850 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 851 | size_t this_dir_len; |
e0881a8e | 852 | |
e6712ff1 | 853 | this_dir_len = strlen (this_dir); |
17a37d48 | 854 | |
e6712ff1 DE |
855 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
856 | && (this_dir[pdir_len] == '\0' | |
857 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 858 | { |
9b292f68 | 859 | const char *subdir = NULL; |
e6712ff1 | 860 | |
9b292f68 | 861 | std::string subdir_holder; |
e6712ff1 | 862 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 863 | { |
9b292f68 TT |
864 | subdir_holder = std::string (this_dir + pdir_len + 1); |
865 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 866 | } |
e6712ff1 | 867 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
868 | if (rc) |
869 | break; | |
17a37d48 | 870 | } |
e6712ff1 | 871 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
872 | { |
873 | if (try_thread_db_load_from_sdir ()) | |
874 | { | |
875 | rc = 1; | |
876 | break; | |
877 | } | |
878 | } | |
879 | else | |
17a37d48 | 880 | { |
98a5dd13 DE |
881 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
882 | { | |
883 | rc = 1; | |
884 | break; | |
885 | } | |
17a37d48 PP |
886 | } |
887 | } | |
98a5dd13 DE |
888 | |
889 | if (libthread_db_debug) | |
883ed13e PA |
890 | fprintf_unfiltered (gdb_stdlog, |
891 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
892 | return rc; |
893 | } | |
894 | ||
98a5dd13 DE |
895 | /* Return non-zero if the inferior has a libpthread. */ |
896 | ||
897 | static int | |
898 | has_libpthread (void) | |
899 | { | |
900 | struct objfile *obj; | |
901 | ||
902 | ALL_OBJFILES (obj) | |
4262abfb | 903 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
904 | return 1; |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
17a37d48 | 909 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 910 | Return 1 on success. */ |
17a37d48 PP |
911 | |
912 | static int | |
913 | thread_db_load (void) | |
914 | { | |
d90e17a7 | 915 | struct thread_db_info *info; |
17a37d48 | 916 | |
dfd4cc63 | 917 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
918 | |
919 | if (info != NULL) | |
17a37d48 PP |
920 | return 1; |
921 | ||
856d6f99 PA |
922 | /* Don't attempt to use thread_db on executables not running |
923 | yet. */ | |
924 | if (!target_has_registers) | |
17a37d48 PP |
925 | return 0; |
926 | ||
927 | /* Don't attempt to use thread_db for remote targets. */ | |
f6ac5f3d | 928 | if (!(target_can_run () || core_bfd)) |
17a37d48 PP |
929 | return 0; |
930 | ||
931 | if (thread_db_load_search ()) | |
932 | return 1; | |
933 | ||
98a5dd13 DE |
934 | /* We couldn't find a libthread_db. |
935 | If the inferior has a libpthread warn the user. */ | |
936 | if (has_libpthread ()) | |
937 | { | |
938 | warning (_("Unable to find libthread_db matching inferior's thread" | |
939 | " library, thread debugging will not be available.")); | |
940 | return 0; | |
17a37d48 | 941 | } |
98a5dd13 | 942 | |
17a37d48 PP |
943 | /* Either this executable isn't using libpthread at all, or it is |
944 | statically linked. Since we can't easily distinguish these two cases, | |
945 | no warning is issued. */ | |
946 | return 0; | |
947 | } | |
948 | ||
fb0e1ba7 MK |
949 | static void |
950 | check_thread_signals (void) | |
951 | { | |
21bf60fe | 952 | if (!thread_signals) |
fb0e1ba7 MK |
953 | { |
954 | sigset_t mask; | |
955 | int i; | |
956 | ||
669211f5 | 957 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
958 | sigemptyset (&thread_stop_set); |
959 | sigemptyset (&thread_print_set); | |
960 | ||
b9569773 | 961 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
962 | { |
963 | if (sigismember (&mask, i)) | |
964 | { | |
2ea28649 | 965 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 966 | sigaddset (&thread_stop_set, i); |
2ea28649 | 967 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
968 | sigaddset (&thread_print_set, i); |
969 | thread_signals = 1; | |
970 | } | |
971 | } | |
972 | } | |
fb0e1ba7 MK |
973 | } |
974 | ||
0ec9a092 DJ |
975 | /* Check whether thread_db is usable. This function is called when |
976 | an inferior is created (or otherwise acquired, e.g. attached to) | |
977 | and when new shared libraries are loaded into a running process. */ | |
978 | ||
979 | void | |
980 | check_for_thread_db (void) | |
fb0e1ba7 | 981 | { |
b5057acd | 982 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 983 | if (!thread_db_load ()) |
b5057acd | 984 | return; |
0ec9a092 DJ |
985 | } |
986 | ||
0838fb57 DE |
987 | /* This function is called via the new_objfile observer. */ |
988 | ||
0ec9a092 DJ |
989 | static void |
990 | thread_db_new_objfile (struct objfile *objfile) | |
991 | { | |
d90e17a7 PA |
992 | /* This observer must always be called with inferior_ptid set |
993 | correctly. */ | |
994 | ||
0838fb57 | 995 | if (objfile != NULL |
fcb44371 | 996 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 997 | loaded (and notified without successful thread_db initialization) |
76727919 | 998 | the time gdb::observers::new_objfile.notify is called for the library itself. |
fcb44371 JK |
999 | Static executables have their separate debug info loaded already |
1000 | before the inferior has started. */ | |
1001 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1002 | /* Only check for thread_db if we loaded libpthread, |
1003 | or if this is the main symbol file. | |
1004 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1005 | a statically linked executable AND the symbol file is specified AFTER | |
1006 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1007 | For dynamically linked executables, libpthread can be near the end | |
1008 | of the list of shared libraries to load, and in an app of several | |
1009 | thousand shared libraries, this can otherwise be painful. */ | |
1010 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1011 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1012 | check_for_thread_db (); |
fb0e1ba7 MK |
1013 | } |
1014 | ||
015de688 DC |
1015 | static void |
1016 | check_pid_namespace_match (void) | |
1017 | { | |
1018 | /* Check is only relevant for local targets targets. */ | |
f6ac5f3d | 1019 | if (target_can_run ()) |
015de688 DC |
1020 | { |
1021 | /* If the child is in a different PID namespace, its idea of its | |
1022 | PID will differ from our idea of its PID. When we scan the | |
1023 | child's thread list, we'll mistakenly think it has no threads | |
1024 | since the thread PID fields won't match the PID we give to | |
1025 | libthread_db. */ | |
9bc3a976 | 1026 | if (!linux_ns_same (ptid_get_pid (inferior_ptid), LINUX_NS_PID)) |
015de688 DC |
1027 | { |
1028 | warning (_ ("Target and debugger are in different PID " | |
1029 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
1030 | "likely unreliable. " |
1031 | "Connect to gdbserver inside the container.")); | |
015de688 | 1032 | } |
015de688 DC |
1033 | } |
1034 | } | |
1035 | ||
0838fb57 DE |
1036 | /* This function is called via the inferior_created observer. |
1037 | This handles the case of debugging statically linked executables. */ | |
1038 | ||
1039 | static void | |
1040 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1041 | { | |
015de688 | 1042 | check_pid_namespace_match (); |
0838fb57 DE |
1043 | check_for_thread_db (); |
1044 | } | |
1045 | ||
c1a747c1 PA |
1046 | /* Update the thread's state (what's displayed in "info threads"), |
1047 | from libthread_db thread state information. */ | |
1048 | ||
1049 | static void | |
7aabaf9d | 1050 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1051 | const td_thrinfo_t *ti_p) |
1052 | { | |
fe978cb0 PA |
1053 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1054 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1055 | } |
1056 | ||
2db9a427 | 1057 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1058 | private info. If TP is NULL or TP is marked as having exited, |
1059 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1060 | |
be550b6e | 1061 | static struct thread_info * |
2db9a427 PA |
1062 | record_thread (struct thread_db_info *info, |
1063 | struct thread_info *tp, | |
1064 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1065 | const td_thrinfo_t *ti_p) | |
1066 | { | |
2db9a427 PA |
1067 | /* A thread ID of zero may mean the thread library has not |
1068 | initialized yet. Leave private == NULL until the thread library | |
1069 | has initialized. */ | |
1070 | if (ti_p->ti_tid == 0) | |
be550b6e | 1071 | return tp; |
2db9a427 | 1072 | |
17faa917 | 1073 | /* Construct the thread's private data. */ |
7aabaf9d | 1074 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1075 | |
fe978cb0 PA |
1076 | priv->th = *th_p; |
1077 | priv->tid = ti_p->ti_tid; | |
1078 | update_thread_state (priv, ti_p); | |
17faa917 | 1079 | |
4eec2deb PA |
1080 | /* Add the thread to GDB's thread list. If we already know about a |
1081 | thread with this PTID, but it's marked exited, then the kernel | |
1082 | reused the tid of an old thread. */ | |
1083 | if (tp == NULL || tp->state == THREAD_EXITED) | |
fe978cb0 | 1084 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1085 | else |
7aabaf9d | 1086 | tp->priv.reset (priv); |
5365276c | 1087 | |
2db9a427 PA |
1088 | if (target_has_execution) |
1089 | check_thread_signals (); | |
be550b6e DE |
1090 | |
1091 | return tp; | |
fb0e1ba7 MK |
1092 | } |
1093 | ||
f6ac5f3d PA |
1094 | void |
1095 | thread_db_target::detach (inferior *inf, int from_tty) | |
fb0e1ba7 | 1096 | { |
f6ac5f3d | 1097 | struct target_ops *target_beneath = find_target_beneath (this); |
c194fbe1 | 1098 | |
bc09b0c1 | 1099 | delete_thread_db_info (inf->pid); |
4105de34 | 1100 | |
f6ac5f3d | 1101 | target_beneath->detach (inf, from_tty); |
d90e17a7 PA |
1102 | |
1103 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1104 | ||
1105 | /* If there are no more processes using libpthread, detach the | |
1106 | thread_db target ops. */ | |
1107 | if (!thread_db_list) | |
f6ac5f3d | 1108 | unpush_target (this); |
fb0e1ba7 MK |
1109 | } |
1110 | ||
f6ac5f3d PA |
1111 | ptid_t |
1112 | thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
1113 | int options) | |
fb0e1ba7 | 1114 | { |
d90e17a7 | 1115 | struct thread_db_info *info; |
f6ac5f3d | 1116 | struct target_ops *beneath = find_target_beneath (this); |
117de6a9 | 1117 | |
f6ac5f3d | 1118 | ptid = beneath->wait (ptid, ourstatus, options); |
fb0e1ba7 | 1119 | |
aa01bd36 PA |
1120 | switch (ourstatus->kind) |
1121 | { | |
1122 | case TARGET_WAITKIND_IGNORE: | |
1123 | case TARGET_WAITKIND_EXITED: | |
1124 | case TARGET_WAITKIND_THREAD_EXITED: | |
1125 | case TARGET_WAITKIND_SIGNALLED: | |
1126 | return ptid; | |
1127 | } | |
fb0e1ba7 | 1128 | |
dfd4cc63 | 1129 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1130 | |
1131 | /* If this process isn't using thread_db, we're done. */ | |
1132 | if (info == NULL) | |
1133 | return ptid; | |
1134 | ||
3f64f7b1 DJ |
1135 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1136 | { | |
d90e17a7 PA |
1137 | /* New image, it may or may not end up using thread_db. Assume |
1138 | not unless we find otherwise. */ | |
dfd4cc63 | 1139 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1140 | if (!thread_db_list) |
f6ac5f3d | 1141 | unpush_target (&the_thread_db_target); |
3f64f7b1 | 1142 | |
49fd4a42 | 1143 | return ptid; |
3f64f7b1 DJ |
1144 | } |
1145 | ||
2db9a427 PA |
1146 | /* Fill in the thread's user-level thread id and status. */ |
1147 | thread_from_lwp (ptid); | |
fb0e1ba7 | 1148 | |
b9b5d7ea | 1149 | return ptid; |
fb0e1ba7 MK |
1150 | } |
1151 | ||
f6ac5f3d PA |
1152 | void |
1153 | thread_db_target::mourn_inferior () | |
fb0e1ba7 | 1154 | { |
f6ac5f3d | 1155 | struct target_ops *target_beneath = find_target_beneath (this); |
117de6a9 | 1156 | |
dfd4cc63 | 1157 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1158 | |
f6ac5f3d | 1159 | target_beneath->mourn_inferior (); |
d90e17a7 | 1160 | |
b26a6851 | 1161 | /* Detach thread_db target ops. */ |
d90e17a7 | 1162 | if (!thread_db_list) |
f6ac5f3d | 1163 | unpush_target (&the_thread_db_target); |
fb0e1ba7 MK |
1164 | } |
1165 | ||
02c6c942 PP |
1166 | struct callback_data |
1167 | { | |
1168 | struct thread_db_info *info; | |
1169 | int new_threads; | |
1170 | }; | |
1171 | ||
fb0e1ba7 MK |
1172 | static int |
1173 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1174 | { | |
1175 | td_thrinfo_t ti; | |
1176 | td_err_e err; | |
39f77062 | 1177 | ptid_t ptid; |
403fe197 | 1178 | struct thread_info *tp; |
9a3c8263 | 1179 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1180 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1181 | |
d90e17a7 | 1182 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1183 | if (err != TD_OK) |
8a3fe4f8 | 1184 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1185 | thread_db_err_str (err)); |
fb0e1ba7 | 1186 | |
a33e3959 PA |
1187 | if (ti.ti_lid == -1) |
1188 | { | |
1189 | /* A thread with kernel thread ID -1 is either a thread that | |
1190 | exited and was joined, or a thread that is being created but | |
1191 | hasn't started yet, and that is reusing the tcb/stack of a | |
1192 | thread that previously exited and was joined. (glibc marks | |
1193 | terminated and joined threads with kernel thread ID -1. See | |
1194 | glibc PR17707. */ | |
d6c146e9 PA |
1195 | if (libthread_db_debug) |
1196 | fprintf_unfiltered (gdb_stdlog, | |
1197 | "thread_db: skipping exited and " | |
d41401ac DE |
1198 | "joined thread (0x%lx)\n", |
1199 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1200 | return 0; |
1201 | } | |
1202 | ||
254f582e | 1203 | if (ti.ti_tid == 0) |
4105de34 DJ |
1204 | { |
1205 | /* A thread ID of zero means that this is the main thread, but | |
1206 | glibc has not yet initialized thread-local storage and the | |
1207 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1208 | be yet. */ |
4105de34 | 1209 | |
4d062f1a PA |
1210 | /* In that case, we're not stopped in a fork syscall and don't |
1211 | need this glibc bug workaround. */ | |
1212 | info->need_stale_parent_threads_check = 0; | |
1213 | ||
4105de34 DJ |
1214 | return 0; |
1215 | } | |
1216 | ||
4d062f1a PA |
1217 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1218 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1219 | avoid doing the work if we know we don't have to. */ | |
1220 | if (info->need_stale_parent_threads_check) | |
1221 | { | |
1222 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1223 | |
4d062f1a PA |
1224 | if (tgid != -1 && tgid != info->pid) |
1225 | return 0; | |
1226 | } | |
1227 | ||
1228 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1229 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1230 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1231 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1232 | |
1233 | return 0; | |
1234 | } | |
1235 | ||
02c6c942 PP |
1236 | /* Helper for thread_db_find_new_threads_2. |
1237 | Returns number of new threads found. */ | |
1238 | ||
1239 | static int | |
1240 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1241 | td_err_e *errp) |
02c6c942 | 1242 | { |
02c6c942 | 1243 | struct callback_data data; |
fb169834 | 1244 | td_err_e err = TD_ERR; |
02c6c942 PP |
1245 | |
1246 | data.info = info; | |
1247 | data.new_threads = 0; | |
1248 | ||
2db9a427 | 1249 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1250 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1251 | |
492d29ea | 1252 | TRY |
02c6c942 PP |
1253 | { |
1254 | /* Iterate over all user-space threads to discover new threads. */ | |
1255 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1256 | find_new_threads_callback, | |
1257 | &data, | |
1258 | TD_THR_ANY_STATE, | |
1259 | TD_THR_LOWEST_PRIORITY, | |
1260 | TD_SIGNO_MASK, | |
1261 | TD_THR_ANY_USER_FLAGS); | |
1262 | } | |
6c63c96a | 1263 | CATCH (except, RETURN_MASK_ERROR) |
02c6c942 | 1264 | { |
6c63c96a | 1265 | if (libthread_db_debug) |
492d29ea PA |
1266 | { |
1267 | exception_fprintf (gdb_stdlog, except, | |
1268 | "Warning: find_new_threads_once: "); | |
1269 | } | |
6c63c96a PA |
1270 | } |
1271 | END_CATCH | |
02c6c942 | 1272 | |
6c63c96a PA |
1273 | if (libthread_db_debug) |
1274 | { | |
883ed13e PA |
1275 | fprintf_unfiltered (gdb_stdlog, |
1276 | _("Found %d new threads in iteration %d.\n"), | |
1277 | data.new_threads, iteration); | |
02c6c942 PP |
1278 | } |
1279 | ||
1280 | if (errp != NULL) | |
1281 | *errp = err; | |
1282 | ||
1283 | return data.new_threads; | |
1284 | } | |
1285 | ||
4c28f408 | 1286 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1287 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1288 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1289 | |
fb0e1ba7 | 1290 | static void |
02c6c942 | 1291 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1292 | { |
fcb44371 | 1293 | td_err_e err = TD_OK; |
d90e17a7 | 1294 | struct thread_db_info *info; |
02c6c942 | 1295 | int i, loop; |
4c28f408 | 1296 | |
dfd4cc63 | 1297 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1298 | |
4c28f408 | 1299 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1300 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1301 | |
1302 | if (until_no_new) | |
1303 | { | |
1304 | /* Require 4 successive iterations which do not find any new threads. | |
1305 | The 4 is a heuristic: there is an inherent race here, and I have | |
1306 | seen that 2 iterations in a row are not always sufficient to | |
1307 | "capture" all threads. */ | |
fcb44371 JK |
1308 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1309 | if (find_new_threads_once (info, i, &err) != 0) | |
1310 | { | |
1311 | /* Found some new threads. Restart the loop from beginning. */ | |
1312 | loop = -1; | |
1313 | } | |
02c6c942 PP |
1314 | } |
1315 | else | |
fcb44371 JK |
1316 | find_new_threads_once (info, 0, &err); |
1317 | ||
1318 | if (err != TD_OK) | |
1319 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1320 | } |
1321 | ||
02c6c942 PP |
1322 | static void |
1323 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1324 | { | |
1325 | thread_db_find_new_threads_2 (ptid, 0); | |
1326 | } | |
1327 | ||
a6904d5a PA |
1328 | /* Implement the to_update_thread_list target method for this |
1329 | target. */ | |
2db9a427 | 1330 | |
f6ac5f3d PA |
1331 | void |
1332 | thread_db_target::update_thread_list () | |
28439f5e | 1333 | { |
d90e17a7 | 1334 | struct thread_db_info *info; |
c65b3e0d | 1335 | struct inferior *inf; |
d90e17a7 | 1336 | |
e8032dde PA |
1337 | prune_threads (); |
1338 | ||
c65b3e0d PA |
1339 | ALL_INFERIORS (inf) |
1340 | { | |
1341 | struct thread_info *thread; | |
d90e17a7 | 1342 | |
c65b3e0d PA |
1343 | if (inf->pid == 0) |
1344 | continue; | |
d90e17a7 | 1345 | |
c65b3e0d PA |
1346 | info = get_thread_db_info (inf->pid); |
1347 | if (info == NULL) | |
1348 | continue; | |
1349 | ||
1350 | thread = any_live_thread_of_process (inf->pid); | |
1351 | if (thread == NULL || thread->executing) | |
1352 | continue; | |
1353 | ||
a6904d5a PA |
1354 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1355 | data structures in the inferior's address space that may be | |
1356 | corrupted, or, if the target is running, the list may change | |
1357 | while we walk it. In the latter case, it's possible that a | |
1358 | thread exits just at the exact time that causes GDB to get | |
1359 | stuck in an infinite loop. To avoid pausing all threads | |
1360 | whenever the core wants to refresh the thread list, we | |
1361 | instead use thread_from_lwp immediately when we see an LWP | |
1362 | stop. That uses thread_db entry points that do not walk | |
1363 | libpthread's thread list, so should be safe, as well as more | |
1364 | efficient. */ | |
1365 | if (target_has_execution_1 (thread->ptid)) | |
1366 | continue; | |
1367 | ||
c65b3e0d PA |
1368 | thread_db_find_new_threads_1 (thread->ptid); |
1369 | } | |
2db9a427 | 1370 | |
a6904d5a | 1371 | /* Give the beneath target a chance to do extra processing. */ |
f6ac5f3d | 1372 | this->beneath->update_thread_list (); |
28439f5e PA |
1373 | } |
1374 | ||
f6ac5f3d PA |
1375 | const char * |
1376 | thread_db_target::pid_to_str (ptid_t ptid) | |
fb0e1ba7 | 1377 | { |
e09875d4 | 1378 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1379 | struct target_ops *beneath; |
17faa917 | 1380 | |
fe978cb0 | 1381 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1382 | { |
1383 | static char buf[64]; | |
7aabaf9d | 1384 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1385 | |
17faa917 | 1386 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
7aabaf9d | 1387 | (unsigned long) priv->tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1388 | |
1389 | return buf; | |
1390 | } | |
1391 | ||
f6ac5f3d PA |
1392 | beneath = find_target_beneath (this); |
1393 | return beneath->pid_to_str (ptid); | |
fb0e1ba7 MK |
1394 | } |
1395 | ||
28b17333 DJ |
1396 | /* Return a string describing the state of the thread specified by |
1397 | INFO. */ | |
1398 | ||
f6ac5f3d PA |
1399 | const char * |
1400 | thread_db_target::extra_thread_info (thread_info *info) | |
28b17333 | 1401 | { |
fe978cb0 | 1402 | if (info->priv == NULL) |
17faa917 DJ |
1403 | return NULL; |
1404 | ||
7aabaf9d SM |
1405 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1406 | ||
1407 | if (priv->dying) | |
28b17333 DJ |
1408 | return "Exiting"; |
1409 | ||
1410 | return NULL; | |
1411 | } | |
1412 | ||
e04ee09e KB |
1413 | /* Return pointer to the thread_info struct which corresponds to |
1414 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1415 | ||
f6ac5f3d PA |
1416 | thread_info * |
1417 | thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
1418 | int handle_len, | |
1419 | inferior *inf) | |
e04ee09e KB |
1420 | { |
1421 | struct thread_info *tp; | |
1422 | thread_t handle_tid; | |
1423 | ||
1424 | /* Thread handle sizes must match in order to proceed. We don't use an | |
1425 | assert here because the resulting internal error will cause GDB to | |
1426 | exit. This isn't necessarily an internal error due to the possibility | |
1427 | of garbage being passed as the thread handle via the python interface. */ | |
1428 | if (handle_len != sizeof (handle_tid)) | |
1429 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), | |
1430 | handle_len, sizeof (handle_tid)); | |
1431 | ||
1432 | handle_tid = * (const thread_t *) thread_handle; | |
1433 | ||
1434 | ALL_NON_EXITED_THREADS (tp) | |
1435 | { | |
7aabaf9d SM |
1436 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1437 | ||
1438 | if (tp->inf == inf && priv != NULL && handle_tid == priv->tid) | |
e04ee09e KB |
1439 | return tp; |
1440 | } | |
1441 | ||
1442 | return NULL; | |
1443 | } | |
1444 | ||
b2756930 KB |
1445 | /* Get the address of the thread local variable in load module LM which |
1446 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c | 1447 | |
f6ac5f3d PA |
1448 | CORE_ADDR |
1449 | thread_db_target::get_thread_local_address (ptid_t ptid, | |
1450 | CORE_ADDR lm, | |
1451 | CORE_ADDR offset) | |
3f47be5c | 1452 | { |
17faa917 | 1453 | struct thread_info *thread_info; |
117de6a9 | 1454 | struct target_ops *beneath; |
17faa917 | 1455 | |
17faa917 | 1456 | /* Find the matching thread. */ |
e09875d4 | 1457 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1458 | |
e0fd7c47 UW |
1459 | /* We may not have discovered the thread yet. */ |
1460 | if (thread_info != NULL && thread_info->priv == NULL) | |
be550b6e | 1461 | thread_info = thread_from_lwp (ptid); |
e0fd7c47 | 1462 | |
fe978cb0 | 1463 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1464 | { |
3f47be5c | 1465 | td_err_e err; |
00f515da | 1466 | psaddr_t address; |
7aabaf9d SM |
1467 | thread_db_info *info = get_thread_db_info (ptid_get_pid (ptid)); |
1468 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); | |
3f47be5c | 1469 | |
3f47be5c | 1470 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1471 | if (lm != 0) |
1472 | { | |
1473 | /* glibc doesn't provide the needed interface. */ | |
1474 | if (!info->td_thr_tls_get_addr_p) | |
1475 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1476 | _("No TLS library support")); | |
1477 | ||
1478 | /* Note the cast through uintptr_t: this interface only works if | |
1479 | a target address fits in a psaddr_t, which is a host pointer. | |
1480 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1481 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1482 | (psaddr_t)(uintptr_t) lm, |
1483 | offset, &address); | |
1484 | } | |
1485 | else | |
1486 | { | |
1487 | /* If glibc doesn't provide the needed interface throw an error | |
1488 | that LM is zero - normally cases it should not be. */ | |
1489 | if (!info->td_thr_tlsbase_p) | |
1490 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1491 | _("TLS load module not found")); | |
1492 | ||
1493 | /* This code path handles the case of -static -pthread executables: | |
1494 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1495 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1496 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1497 | The constant number 1 depends on GNU __libc_setup_tls | |
1498 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1499 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1500 | address = (char *) address + offset; |
1501 | } | |
3f47be5c EZ |
1502 | |
1503 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1504 | /* The memory hasn't been allocated, yet. */ | |
1505 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1506 | /* Now, if libthread_db provided the initialization image's |
1507 | address, we *could* try to build a non-lvalue value from | |
1508 | the initialization image. */ | |
109c3e39 AC |
1509 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1510 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1511 | #endif |
1512 | ||
1513 | /* Something else went wrong. */ | |
1514 | if (err != TD_OK) | |
109c3e39 AC |
1515 | throw_error (TLS_GENERIC_ERROR, |
1516 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1517 | |
1518 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1519 | /* Do proper sign extension for the target. */ |
1520 | gdb_assert (exec_bfd); | |
1521 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1522 | ? (CORE_ADDR) (intptr_t) address | |
1523 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1524 | } |
1525 | ||
f6ac5f3d PA |
1526 | beneath = find_target_beneath (this); |
1527 | return beneath->get_thread_local_address (ptid, lm, offset); | |
3f47be5c EZ |
1528 | } |
1529 | ||
0ef643c8 JB |
1530 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1531 | ||
f6ac5f3d PA |
1532 | ptid_t |
1533 | thread_db_target::get_ada_task_ptid (long lwp, long thread) | |
0ef643c8 | 1534 | { |
2db9a427 PA |
1535 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
1536 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
0ef643c8 JB |
1537 | } |
1538 | ||
f6ac5f3d PA |
1539 | void |
1540 | thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
4d062f1a | 1541 | { |
f6ac5f3d | 1542 | struct target_ops *beneath = find_target_beneath (this); |
4d062f1a PA |
1543 | struct thread_db_info *info; |
1544 | ||
1545 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1546 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1547 | else |
dfd4cc63 | 1548 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1549 | |
1550 | /* This workaround is only needed for child fork lwps stopped in a | |
1551 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1552 | workaround can be disabled. */ | |
1553 | if (info) | |
1554 | info->need_stale_parent_threads_check = 0; | |
1555 | ||
f6ac5f3d | 1556 | beneath->resume (ptid, step, signo); |
4d062f1a PA |
1557 | } |
1558 | ||
9b292f68 | 1559 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1560 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1561 | PID, both in ascending order. */ | |
1562 | ||
9b292f68 TT |
1563 | static bool |
1564 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1565 | const struct thread_db_info *b) | |
bf88dd68 | 1566 | { |
bf88dd68 JK |
1567 | int retval; |
1568 | ||
1569 | retval = strcmp (a->filename, b->filename); | |
1570 | if (retval) | |
9b292f68 | 1571 | return retval < 0; |
bf88dd68 | 1572 | |
9b292f68 | 1573 | return a->pid < b->pid; |
bf88dd68 JK |
1574 | } |
1575 | ||
1576 | /* Implement 'info auto-load libthread-db'. */ | |
1577 | ||
1578 | static void | |
5fed81ff | 1579 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1580 | { |
1581 | struct ui_out *uiout = current_uiout; | |
1582 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1583 | struct thread_db_info *info; |
1584 | unsigned unique_filenames; | |
1585 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1586 | int i; |
1587 | ||
f1735a53 | 1588 | cs = skip_spaces (cs); |
bf88dd68 JK |
1589 | if (*cs) |
1590 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1591 | ||
9b292f68 | 1592 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1593 | for (info = thread_db_list; info; info = info->next) |
1594 | if (info->filename != NULL) | |
9b292f68 | 1595 | array.push_back (info); |
bf88dd68 JK |
1596 | |
1597 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1598 | std::sort (array.begin (), array.end (), |
1599 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1600 | |
1601 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1602 | length of PIDs list for the unique filenames (columns). */ | |
1603 | ||
1604 | unique_filenames = 0; | |
1605 | max_filename_len = 0; | |
bf88dd68 | 1606 | pids_len = 0; |
9b292f68 | 1607 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1608 | { |
1609 | int pid = array[i]->pid; | |
1610 | size_t this_pid_len; | |
1611 | ||
1612 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1613 | this_pid_len++; | |
1614 | ||
1615 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1616 | { | |
1617 | unique_filenames++; | |
325fac50 PA |
1618 | max_filename_len = std::max (max_filename_len, |
1619 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1620 | |
1621 | if (i > 0) | |
9b292f68 | 1622 | pids_len -= strlen (", "); |
bf88dd68 JK |
1623 | pids_len = 0; |
1624 | } | |
1625 | pids_len += this_pid_len + strlen (", "); | |
1626 | } | |
1627 | if (i) | |
9b292f68 | 1628 | pids_len -= strlen (", "); |
bf88dd68 JK |
1629 | |
1630 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1631 | its columns. */ | |
9b292f68 | 1632 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1633 | uiout->text ("\n"); |
bf88dd68 | 1634 | |
4a2b031d TT |
1635 | { |
1636 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1637 | "LinuxThreadDbTable"); | |
bf88dd68 | 1638 | |
4a2b031d TT |
1639 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1640 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1641 | uiout->table_body (); | |
bf88dd68 | 1642 | |
4a2b031d | 1643 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1644 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1645 | { |
1646 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1647 | |
4a2b031d TT |
1648 | info = array[i]; |
1649 | uiout->field_string ("filename", info->filename); | |
bf88dd68 | 1650 | |
9b292f68 TT |
1651 | std::string pids; |
1652 | while (i < array.size () && strcmp (info->filename, | |
1653 | array[i]->filename) == 0) | |
4a2b031d | 1654 | { |
9b292f68 TT |
1655 | if (!pids.empty ()) |
1656 | pids += ", "; | |
1657 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1658 | i++; |
1659 | } | |
bf88dd68 | 1660 | |
9b292f68 | 1661 | uiout->field_string ("pids", pids.c_str ()); |
bf88dd68 | 1662 | |
4a2b031d TT |
1663 | uiout->text ("\n"); |
1664 | } | |
1665 | } | |
bf88dd68 | 1666 | |
9b292f68 | 1667 | if (array.empty ()) |
112e8700 | 1668 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1669 | } |
1670 | ||
fb0e1ba7 MK |
1671 | void |
1672 | _initialize_thread_db (void) | |
1673 | { | |
17a37d48 PP |
1674 | /* Defer loading of libthread_db.so until inferior is running. |
1675 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1676 | executable -- there could be multiple versions of glibc, |
1677 | and until there is a running inferior, we can't tell which | |
1678 | libthread_db is the correct one to load. */ | |
17a37d48 PP |
1679 | |
1680 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1681 | ||
1682 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1683 | class_support, | |
1684 | &libthread_db_search_path, _("\ | |
1685 | Set search path for libthread_db."), _("\ | |
1686 | Show the current search path or libthread_db."), _("\ | |
1687 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1688 | gdb itself.\n\ |
1689 | Its value is a colon (':') separate list of directories to search.\n\ | |
1690 | Setting the search path to an empty list resets it to its default value."), | |
1691 | set_libthread_db_search_path, | |
17a37d48 PP |
1692 | NULL, |
1693 | &setlist, &showlist); | |
02d868e8 | 1694 | |
ccce17b0 YQ |
1695 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1696 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1697 | Set libthread-db debugging."), _("\ |
1698 | Show libthread-db debugging."), _("\ | |
1699 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
1700 | NULL, |
1701 | show_libthread_db_debug, | |
1702 | &setdebuglist, &showdebuglist); | |
02d868e8 | 1703 | |
bf88dd68 JK |
1704 | add_setshow_boolean_cmd ("libthread-db", class_support, |
1705 | &auto_load_thread_db, _("\ | |
1706 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
1707 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
1708 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
1709 | locations to load libthread_db compatible with the inferior.\n\ | |
1710 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
1711 | This options has security implications for untrusted inferiors."), | |
1712 | NULL, show_auto_load_thread_db, | |
1713 | auto_load_set_cmdlist_get (), | |
1714 | auto_load_show_cmdlist_get ()); | |
1715 | ||
1716 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
1717 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
1718 | Usage: info auto-load libthread-db"), | |
1719 | auto_load_info_cmdlist_get ()); | |
1720 | ||
17a37d48 | 1721 | /* Add ourselves to objfile event chain. */ |
76727919 | 1722 | gdb::observers::new_objfile.attach (thread_db_new_objfile); |
0838fb57 DE |
1723 | |
1724 | /* Add ourselves to inferior_created event chain. | |
1725 | This is needed to handle debugging statically linked programs where | |
1726 | the new_objfile observer won't get called for libpthread. */ | |
76727919 | 1727 | gdb::observers::inferior_created.attach (thread_db_inferior_created); |
fb0e1ba7 | 1728 | } |