Commit | Line | Data |
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ce3a066d | 1 | /* Inferior process information for the remote server for GDB. |
61baf725 | 2 | Copyright (C) 2002-2017 Free Software Foundation, Inc. |
ce3a066d DJ |
3 | |
4 | Contributed by MontaVista Software. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
ce3a066d DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
ce3a066d | 20 | |
ce3a066d | 21 | #include "server.h" |
623b6bdf | 22 | #include "gdbthread.h" |
799cdc37 | 23 | #include "dll.h" |
ce3a066d | 24 | |
95954743 | 25 | struct inferior_list all_processes; |
0d62e5e8 DJ |
26 | struct inferior_list all_threads; |
27 | ||
0bfdf32f | 28 | struct thread_info *current_thread; |
0d62e5e8 DJ |
29 | |
30 | #define get_thread(inf) ((struct thread_info *)(inf)) | |
31 | ||
32 | void | |
33 | add_inferior_to_list (struct inferior_list *list, | |
34 | struct inferior_list_entry *new_inferior) | |
35 | { | |
36 | new_inferior->next = NULL; | |
37 | if (list->tail != NULL) | |
38 | list->tail->next = new_inferior; | |
39 | else | |
40 | list->head = new_inferior; | |
41 | list->tail = new_inferior; | |
42 | } | |
43 | ||
9f767825 DE |
44 | /* Invoke ACTION for each inferior in LIST. */ |
45 | ||
0d62e5e8 DJ |
46 | void |
47 | for_each_inferior (struct inferior_list *list, | |
48 | void (*action) (struct inferior_list_entry *)) | |
49 | { | |
50 | struct inferior_list_entry *cur = list->head, *next; | |
51 | ||
52 | while (cur != NULL) | |
53 | { | |
54 | next = cur->next; | |
55 | (*action) (cur); | |
56 | cur = next; | |
57 | } | |
58 | } | |
ce3a066d | 59 | |
649ebbca DE |
60 | /* Invoke ACTION for each inferior in LIST, passing DATA to ACTION. */ |
61 | ||
62 | void | |
63 | for_each_inferior_with_data (struct inferior_list *list, | |
64 | void (*action) (struct inferior_list_entry *, | |
65 | void *), | |
66 | void *data) | |
67 | { | |
68 | struct inferior_list_entry *cur = list->head, *next; | |
69 | ||
70 | while (cur != NULL) | |
71 | { | |
72 | next = cur->next; | |
73 | (*action) (cur, data); | |
74 | cur = next; | |
75 | } | |
76 | } | |
77 | ||
0d62e5e8 DJ |
78 | void |
79 | remove_inferior (struct inferior_list *list, | |
80 | struct inferior_list_entry *entry) | |
81 | { | |
82 | struct inferior_list_entry **cur; | |
ce3a066d | 83 | |
0d62e5e8 DJ |
84 | if (list->head == entry) |
85 | { | |
86 | list->head = entry->next; | |
87 | if (list->tail == entry) | |
88 | list->tail = list->head; | |
89 | return; | |
90 | } | |
91 | ||
92 | cur = &list->head; | |
93 | while (*cur && (*cur)->next != entry) | |
94 | cur = &(*cur)->next; | |
95 | ||
96 | if (*cur == NULL) | |
97 | return; | |
ce3a066d | 98 | |
0d62e5e8 DJ |
99 | (*cur)->next = entry->next; |
100 | ||
101 | if (list->tail == entry) | |
102 | list->tail = *cur; | |
103 | } | |
104 | ||
f7667f0d | 105 | struct thread_info * |
95954743 | 106 | add_thread (ptid_t thread_id, void *target_data) |
0d62e5e8 | 107 | { |
8d749320 | 108 | struct thread_info *new_thread = XCNEW (struct thread_info); |
0d62e5e8 DJ |
109 | |
110 | new_thread->entry.id = thread_id; | |
8336d594 | 111 | new_thread->last_resume_kind = resume_continue; |
fc7238bb | 112 | new_thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
0d62e5e8 | 113 | |
ecc6f45c | 114 | add_inferior_to_list (&all_threads, &new_thread->entry); |
255e7678 | 115 | |
0bfdf32f GB |
116 | if (current_thread == NULL) |
117 | current_thread = new_thread; | |
ce3a066d | 118 | |
0d62e5e8 | 119 | new_thread->target_data = target_data; |
f7667f0d DE |
120 | |
121 | return new_thread; | |
a06660f7 DJ |
122 | } |
123 | ||
95954743 | 124 | ptid_t |
a06660f7 DJ |
125 | thread_to_gdb_id (struct thread_info *thread) |
126 | { | |
95954743 | 127 | return thread->entry.id; |
a06660f7 DJ |
128 | } |
129 | ||
649ebbca DE |
130 | /* Wrapper around get_first_inferior to return a struct thread_info *. */ |
131 | ||
dae5f5cf | 132 | struct thread_info * |
649ebbca | 133 | get_first_thread (void) |
a06660f7 | 134 | { |
649ebbca DE |
135 | return (struct thread_info *) get_first_inferior (&all_threads); |
136 | } | |
a06660f7 | 137 | |
649ebbca DE |
138 | struct thread_info * |
139 | find_thread_ptid (ptid_t ptid) | |
140 | { | |
141 | return (struct thread_info *) find_inferior_id (&all_threads, ptid); | |
dae5f5cf DJ |
142 | } |
143 | ||
96e7a1eb AR |
144 | /* Find a thread associated with the given PROCESS, or NULL if no |
145 | such thread exists. */ | |
146 | ||
147 | static struct thread_info * | |
148 | find_thread_process (const struct process_info *const process) | |
149 | { | |
785922a5 | 150 | return find_any_thread_of_pid (process->entry.id.pid ()); |
96e7a1eb AR |
151 | } |
152 | ||
34c65914 PA |
153 | /* Helper for find_any_thread_of_pid. Returns true if a thread |
154 | matches a PID. */ | |
155 | ||
156 | static int | |
157 | thread_of_pid (struct inferior_list_entry *entry, void *pid_p) | |
158 | { | |
159 | int pid = *(int *) pid_p; | |
160 | ||
161 | return (ptid_get_pid (entry->id) == pid); | |
162 | } | |
163 | ||
164 | /* See gdbthread.h. */ | |
165 | ||
166 | struct thread_info * | |
167 | find_any_thread_of_pid (int pid) | |
168 | { | |
169 | struct inferior_list_entry *entry; | |
170 | ||
171 | entry = find_inferior (&all_threads, thread_of_pid, &pid); | |
172 | ||
173 | return (struct thread_info *) entry; | |
174 | } | |
175 | ||
0d62e5e8 DJ |
176 | static void |
177 | free_one_thread (struct inferior_list_entry *inf) | |
178 | { | |
179 | struct thread_info *thread = get_thread (inf); | |
6afd337d | 180 | free_register_cache (thread_regcache_data (thread)); |
0d62e5e8 DJ |
181 | free (thread); |
182 | } | |
183 | ||
184 | void | |
185 | remove_thread (struct thread_info *thread) | |
186 | { | |
9accd112 MM |
187 | if (thread->btrace != NULL) |
188 | target_disable_btrace (thread->btrace); | |
189 | ||
465a859e | 190 | discard_queued_stop_replies (ptid_of (thread)); |
0d62e5e8 DJ |
191 | remove_inferior (&all_threads, (struct inferior_list_entry *) thread); |
192 | free_one_thread (&thread->entry); | |
96e7a1eb AR |
193 | if (current_thread == thread) |
194 | current_thread = NULL; | |
ce3a066d DJ |
195 | } |
196 | ||
649ebbca DE |
197 | /* Return a pointer to the first inferior in LIST, or NULL if there isn't one. |
198 | This is for cases where the caller needs a thread, but doesn't care | |
199 | which one. */ | |
200 | ||
201 | struct inferior_list_entry * | |
202 | get_first_inferior (struct inferior_list *list) | |
203 | { | |
3b8361aa DE |
204 | if (list->head != NULL) |
205 | return list->head; | |
649ebbca DE |
206 | return NULL; |
207 | } | |
208 | ||
0718675c JB |
209 | /* Find the first inferior_list_entry E in LIST for which FUNC (E, ARG) |
210 | returns non-zero. If no entry is found then return NULL. */ | |
211 | ||
0d62e5e8 DJ |
212 | struct inferior_list_entry * |
213 | find_inferior (struct inferior_list *list, | |
214 | int (*func) (struct inferior_list_entry *, void *), void *arg) | |
215 | { | |
216 | struct inferior_list_entry *inf = list->head; | |
ce3a066d | 217 | |
0d62e5e8 | 218 | while (inf != NULL) |
ce3a066d | 219 | { |
a07b2135 PA |
220 | struct inferior_list_entry *next; |
221 | ||
222 | next = inf->next; | |
0d62e5e8 DJ |
223 | if ((*func) (inf, arg)) |
224 | return inf; | |
a07b2135 | 225 | inf = next; |
0d62e5e8 | 226 | } |
611cb4a5 | 227 | |
0d62e5e8 DJ |
228 | return NULL; |
229 | } | |
611cb4a5 | 230 | |
89342618 YQ |
231 | /* Find the random inferior_list_entry E in LIST for which FUNC (E, ARG) |
232 | returns non-zero. If no entry is found then return NULL. */ | |
233 | ||
234 | struct inferior_list_entry * | |
235 | find_inferior_in_random (struct inferior_list *list, | |
236 | int (*func) (struct inferior_list_entry *, void *), | |
237 | void *arg) | |
238 | { | |
239 | struct inferior_list_entry *inf = list->head; | |
240 | int count = 0; | |
241 | int random_selector; | |
242 | ||
243 | /* First count how many interesting entries we have. */ | |
244 | while (inf != NULL) | |
245 | { | |
246 | struct inferior_list_entry *next; | |
247 | ||
248 | next = inf->next; | |
249 | if ((*func) (inf, arg)) | |
250 | count++; | |
251 | inf = next; | |
252 | } | |
253 | ||
254 | if (count == 0) | |
255 | return NULL; | |
256 | ||
257 | /* Now randomly pick an entry out of those. */ | |
258 | random_selector = (int) | |
259 | ((count * (double) rand ()) / (RAND_MAX + 1.0)); | |
260 | ||
261 | inf = list->head; | |
262 | while (inf != NULL) | |
263 | { | |
264 | struct inferior_list_entry *next; | |
265 | ||
266 | next = inf->next; | |
267 | if ((*func) (inf, arg) && (random_selector-- == 0)) | |
268 | return inf; | |
269 | inf = next; | |
270 | } | |
271 | ||
272 | gdb_assert_not_reached ("failed to find an inferior in random."); | |
273 | return NULL; | |
274 | } | |
275 | ||
0d62e5e8 | 276 | struct inferior_list_entry * |
95954743 | 277 | find_inferior_id (struct inferior_list *list, ptid_t id) |
0d62e5e8 DJ |
278 | { |
279 | struct inferior_list_entry *inf = list->head; | |
280 | ||
281 | while (inf != NULL) | |
282 | { | |
95954743 | 283 | if (ptid_equal (inf->id, id)) |
0d62e5e8 DJ |
284 | return inf; |
285 | inf = inf->next; | |
ce3a066d DJ |
286 | } |
287 | ||
0d62e5e8 | 288 | return NULL; |
ce3a066d | 289 | } |
611cb4a5 DJ |
290 | |
291 | void * | |
6afd337d | 292 | thread_target_data (struct thread_info *thread) |
611cb4a5 | 293 | { |
6afd337d | 294 | return thread->target_data; |
611cb4a5 DJ |
295 | } |
296 | ||
a44892be | 297 | struct regcache * |
6afd337d | 298 | thread_regcache_data (struct thread_info *thread) |
c04a1aa8 | 299 | { |
6afd337d | 300 | return thread->regcache_data; |
c04a1aa8 DJ |
301 | } |
302 | ||
303 | void | |
6afd337d | 304 | set_thread_regcache_data (struct thread_info *thread, struct regcache *data) |
c04a1aa8 | 305 | { |
6afd337d | 306 | thread->regcache_data = data; |
c04a1aa8 | 307 | } |
255e7678 | 308 | |
649ebbca DE |
309 | /* Return true if LIST has exactly one entry. */ |
310 | ||
311 | int | |
312 | one_inferior_p (struct inferior_list *list) | |
313 | { | |
314 | return list->head != NULL && list->head == list->tail; | |
315 | } | |
316 | ||
317 | /* Reset head,tail of LIST, assuming all entries have already been freed. */ | |
318 | ||
319 | void | |
320 | clear_inferior_list (struct inferior_list *list) | |
321 | { | |
322 | list->head = NULL; | |
323 | list->tail = NULL; | |
324 | } | |
255e7678 DJ |
325 | |
326 | void | |
327 | clear_inferiors (void) | |
328 | { | |
329 | for_each_inferior (&all_threads, free_one_thread); | |
649ebbca | 330 | clear_inferior_list (&all_threads); |
bf4c19f7 YQ |
331 | |
332 | clear_dlls (); | |
7284e1be | 333 | |
0bfdf32f | 334 | current_thread = NULL; |
255e7678 | 335 | } |
24a09b5f | 336 | |
95954743 PA |
337 | struct process_info * |
338 | add_process (int pid, int attached) | |
339 | { | |
8d749320 | 340 | struct process_info *process = XCNEW (struct process_info); |
95954743 | 341 | |
80894984 | 342 | process->entry.id = pid_to_ptid (pid); |
95954743 PA |
343 | process->attached = attached; |
344 | ||
80894984 | 345 | add_inferior_to_list (&all_processes, &process->entry); |
95954743 PA |
346 | |
347 | return process; | |
348 | } | |
349 | ||
5091eb23 DE |
350 | /* Remove a process from the common process list and free the memory |
351 | allocated for it. | |
352 | The caller is responsible for freeing private data first. */ | |
353 | ||
95954743 PA |
354 | void |
355 | remove_process (struct process_info *process) | |
356 | { | |
357 | clear_symbol_cache (&process->symbol_cache); | |
358 | free_all_breakpoints (process); | |
96e7a1eb | 359 | gdb_assert (find_thread_process (process) == NULL); |
80894984 | 360 | remove_inferior (&all_processes, &process->entry); |
82075af2 | 361 | VEC_free (int, process->syscalls_to_catch); |
5091eb23 | 362 | free (process); |
95954743 PA |
363 | } |
364 | ||
365 | struct process_info * | |
366 | find_process_pid (int pid) | |
367 | { | |
368 | return (struct process_info *) | |
369 | find_inferior_id (&all_processes, pid_to_ptid (pid)); | |
370 | } | |
371 | ||
3d40fbb5 PA |
372 | /* Wrapper around get_first_inferior to return a struct process_info *. */ |
373 | ||
374 | struct process_info * | |
375 | get_first_process (void) | |
376 | { | |
377 | return (struct process_info *) get_first_inferior (&all_processes); | |
378 | } | |
379 | ||
9f767825 DE |
380 | /* Return non-zero if INF, a struct process_info, was started by us, |
381 | i.e. not attached to. */ | |
382 | ||
383 | static int | |
384 | started_inferior_callback (struct inferior_list_entry *entry, void *args) | |
385 | { | |
386 | struct process_info *process = (struct process_info *) entry; | |
387 | ||
388 | return ! process->attached; | |
389 | } | |
390 | ||
391 | /* Return non-zero if there are any inferiors that we have created | |
392 | (as opposed to attached-to). */ | |
393 | ||
394 | int | |
395 | have_started_inferiors_p (void) | |
396 | { | |
397 | return (find_inferior (&all_processes, started_inferior_callback, NULL) | |
398 | != NULL); | |
399 | } | |
400 | ||
401 | /* Return non-zero if INF, a struct process_info, was attached to. */ | |
402 | ||
403 | static int | |
404 | attached_inferior_callback (struct inferior_list_entry *entry, void *args) | |
405 | { | |
406 | struct process_info *process = (struct process_info *) entry; | |
407 | ||
408 | return process->attached; | |
409 | } | |
410 | ||
411 | /* Return non-zero if there are any inferiors that we have attached to. */ | |
412 | ||
413 | int | |
414 | have_attached_inferiors_p (void) | |
415 | { | |
416 | return (find_inferior (&all_processes, attached_inferior_callback, NULL) | |
417 | != NULL); | |
418 | } | |
419 | ||
7fe519cb | 420 | struct process_info * |
63c40ec7 | 421 | get_thread_process (const struct thread_info *thread) |
95954743 PA |
422 | { |
423 | int pid = ptid_get_pid (thread->entry.id); | |
424 | return find_process_pid (pid); | |
425 | } | |
426 | ||
427 | struct process_info * | |
428 | current_process (void) | |
429 | { | |
0bfdf32f GB |
430 | gdb_assert (current_thread != NULL); |
431 | return get_thread_process (current_thread); | |
95954743 | 432 | } |
984a2c04 YQ |
433 | |
434 | static void | |
435 | do_restore_current_thread_cleanup (void *arg) | |
436 | { | |
437 | current_thread = (struct thread_info *) arg; | |
438 | } | |
439 | ||
440 | struct cleanup * | |
441 | make_cleanup_restore_current_thread (void) | |
442 | { | |
443 | return make_cleanup (do_restore_current_thread_cleanup, current_thread); | |
444 | } | |
043a4934 SDJ |
445 | |
446 | /* See common/common-gdbthread.h. */ | |
447 | ||
448 | void | |
449 | switch_to_thread (ptid_t ptid) | |
450 | { | |
451 | if (!ptid_equal (ptid, minus_one_ptid)) | |
452 | current_thread = find_thread_ptid (ptid); | |
453 | } |