| 1 | /* Inferior process information for the remote server for GDB. |
| 2 | Copyright (C) 2002-2015 Free Software Foundation, Inc. |
| 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 |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "server.h" |
| 22 | #include "gdbthread.h" |
| 23 | #include "dll.h" |
| 24 | |
| 25 | struct inferior_list all_processes; |
| 26 | struct inferior_list all_threads; |
| 27 | |
| 28 | struct thread_info *current_thread; |
| 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 | |
| 44 | /* Invoke ACTION for each inferior in LIST. */ |
| 45 | |
| 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 | } |
| 59 | |
| 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 | |
| 78 | void |
| 79 | remove_inferior (struct inferior_list *list, |
| 80 | struct inferior_list_entry *entry) |
| 81 | { |
| 82 | struct inferior_list_entry **cur; |
| 83 | |
| 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; |
| 98 | |
| 99 | (*cur)->next = entry->next; |
| 100 | |
| 101 | if (list->tail == entry) |
| 102 | list->tail = *cur; |
| 103 | } |
| 104 | |
| 105 | struct thread_info * |
| 106 | add_thread (ptid_t thread_id, void *target_data) |
| 107 | { |
| 108 | struct thread_info *new_thread = XCNEW (struct thread_info); |
| 109 | |
| 110 | new_thread->entry.id = thread_id; |
| 111 | new_thread->last_resume_kind = resume_continue; |
| 112 | new_thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
| 113 | |
| 114 | add_inferior_to_list (&all_threads, &new_thread->entry); |
| 115 | |
| 116 | if (current_thread == NULL) |
| 117 | current_thread = new_thread; |
| 118 | |
| 119 | new_thread->target_data = target_data; |
| 120 | |
| 121 | return new_thread; |
| 122 | } |
| 123 | |
| 124 | ptid_t |
| 125 | thread_to_gdb_id (struct thread_info *thread) |
| 126 | { |
| 127 | return thread->entry.id; |
| 128 | } |
| 129 | |
| 130 | /* Wrapper around get_first_inferior to return a struct thread_info *. */ |
| 131 | |
| 132 | struct thread_info * |
| 133 | get_first_thread (void) |
| 134 | { |
| 135 | return (struct thread_info *) get_first_inferior (&all_threads); |
| 136 | } |
| 137 | |
| 138 | struct thread_info * |
| 139 | find_thread_ptid (ptid_t ptid) |
| 140 | { |
| 141 | return (struct thread_info *) find_inferior_id (&all_threads, ptid); |
| 142 | } |
| 143 | |
| 144 | /* Predicate function for matching thread entry's pid to the given |
| 145 | pid value passed by address in ARGS. */ |
| 146 | |
| 147 | static int |
| 148 | thread_pid_matches_callback (struct inferior_list_entry *entry, void *args) |
| 149 | { |
| 150 | return (ptid_get_pid (entry->id) == *(pid_t *)args); |
| 151 | } |
| 152 | |
| 153 | /* Find a thread associated with the given PROCESS, or NULL if no |
| 154 | such thread exists. */ |
| 155 | |
| 156 | static struct thread_info * |
| 157 | find_thread_process (const struct process_info *const process) |
| 158 | { |
| 159 | pid_t pid = ptid_get_pid (ptid_of (process)); |
| 160 | |
| 161 | return (struct thread_info *) |
| 162 | find_inferior (&all_threads, thread_pid_matches_callback, &pid); |
| 163 | } |
| 164 | |
| 165 | /* Helper for find_any_thread_of_pid. Returns true if a thread |
| 166 | matches a PID. */ |
| 167 | |
| 168 | static int |
| 169 | thread_of_pid (struct inferior_list_entry *entry, void *pid_p) |
| 170 | { |
| 171 | int pid = *(int *) pid_p; |
| 172 | |
| 173 | return (ptid_get_pid (entry->id) == pid); |
| 174 | } |
| 175 | |
| 176 | /* See gdbthread.h. */ |
| 177 | |
| 178 | struct thread_info * |
| 179 | find_any_thread_of_pid (int pid) |
| 180 | { |
| 181 | struct inferior_list_entry *entry; |
| 182 | |
| 183 | entry = find_inferior (&all_threads, thread_of_pid, &pid); |
| 184 | |
| 185 | return (struct thread_info *) entry; |
| 186 | } |
| 187 | |
| 188 | ptid_t |
| 189 | gdb_id_to_thread_id (ptid_t gdb_id) |
| 190 | { |
| 191 | struct thread_info *thread = find_thread_ptid (gdb_id); |
| 192 | |
| 193 | return thread ? thread->entry.id : null_ptid; |
| 194 | } |
| 195 | |
| 196 | static void |
| 197 | free_one_thread (struct inferior_list_entry *inf) |
| 198 | { |
| 199 | struct thread_info *thread = get_thread (inf); |
| 200 | free_register_cache (inferior_regcache_data (thread)); |
| 201 | free (thread); |
| 202 | } |
| 203 | |
| 204 | void |
| 205 | remove_thread (struct thread_info *thread) |
| 206 | { |
| 207 | if (thread->btrace != NULL) |
| 208 | target_disable_btrace (thread->btrace); |
| 209 | |
| 210 | discard_queued_stop_replies (ptid_of (thread)); |
| 211 | remove_inferior (&all_threads, (struct inferior_list_entry *) thread); |
| 212 | free_one_thread (&thread->entry); |
| 213 | if (current_thread == thread) |
| 214 | current_thread = NULL; |
| 215 | } |
| 216 | |
| 217 | /* Return a pointer to the first inferior in LIST, or NULL if there isn't one. |
| 218 | This is for cases where the caller needs a thread, but doesn't care |
| 219 | which one. */ |
| 220 | |
| 221 | struct inferior_list_entry * |
| 222 | get_first_inferior (struct inferior_list *list) |
| 223 | { |
| 224 | if (list->head != NULL) |
| 225 | return list->head; |
| 226 | return NULL; |
| 227 | } |
| 228 | |
| 229 | /* Find the first inferior_list_entry E in LIST for which FUNC (E, ARG) |
| 230 | returns non-zero. If no entry is found then return NULL. */ |
| 231 | |
| 232 | struct inferior_list_entry * |
| 233 | find_inferior (struct inferior_list *list, |
| 234 | int (*func) (struct inferior_list_entry *, void *), void *arg) |
| 235 | { |
| 236 | struct inferior_list_entry *inf = list->head; |
| 237 | |
| 238 | while (inf != NULL) |
| 239 | { |
| 240 | struct inferior_list_entry *next; |
| 241 | |
| 242 | next = inf->next; |
| 243 | if ((*func) (inf, arg)) |
| 244 | return inf; |
| 245 | inf = next; |
| 246 | } |
| 247 | |
| 248 | return NULL; |
| 249 | } |
| 250 | |
| 251 | struct inferior_list_entry * |
| 252 | find_inferior_id (struct inferior_list *list, ptid_t id) |
| 253 | { |
| 254 | struct inferior_list_entry *inf = list->head; |
| 255 | |
| 256 | while (inf != NULL) |
| 257 | { |
| 258 | if (ptid_equal (inf->id, id)) |
| 259 | return inf; |
| 260 | inf = inf->next; |
| 261 | } |
| 262 | |
| 263 | return NULL; |
| 264 | } |
| 265 | |
| 266 | void * |
| 267 | inferior_target_data (struct thread_info *inferior) |
| 268 | { |
| 269 | return inferior->target_data; |
| 270 | } |
| 271 | |
| 272 | void |
| 273 | set_inferior_target_data (struct thread_info *inferior, void *data) |
| 274 | { |
| 275 | inferior->target_data = data; |
| 276 | } |
| 277 | |
| 278 | struct regcache * |
| 279 | inferior_regcache_data (struct thread_info *inferior) |
| 280 | { |
| 281 | return inferior->regcache_data; |
| 282 | } |
| 283 | |
| 284 | void |
| 285 | set_inferior_regcache_data (struct thread_info *inferior, struct regcache *data) |
| 286 | { |
| 287 | inferior->regcache_data = data; |
| 288 | } |
| 289 | |
| 290 | /* Return true if LIST has exactly one entry. */ |
| 291 | |
| 292 | int |
| 293 | one_inferior_p (struct inferior_list *list) |
| 294 | { |
| 295 | return list->head != NULL && list->head == list->tail; |
| 296 | } |
| 297 | |
| 298 | /* Reset head,tail of LIST, assuming all entries have already been freed. */ |
| 299 | |
| 300 | void |
| 301 | clear_inferior_list (struct inferior_list *list) |
| 302 | { |
| 303 | list->head = NULL; |
| 304 | list->tail = NULL; |
| 305 | } |
| 306 | |
| 307 | void |
| 308 | clear_inferiors (void) |
| 309 | { |
| 310 | for_each_inferior (&all_threads, free_one_thread); |
| 311 | clear_inferior_list (&all_threads); |
| 312 | |
| 313 | clear_dlls (); |
| 314 | |
| 315 | current_thread = NULL; |
| 316 | } |
| 317 | |
| 318 | struct process_info * |
| 319 | add_process (int pid, int attached) |
| 320 | { |
| 321 | struct process_info *process = XCNEW (struct process_info); |
| 322 | |
| 323 | process->entry.id = pid_to_ptid (pid); |
| 324 | process->attached = attached; |
| 325 | |
| 326 | add_inferior_to_list (&all_processes, &process->entry); |
| 327 | |
| 328 | return process; |
| 329 | } |
| 330 | |
| 331 | /* Remove a process from the common process list and free the memory |
| 332 | allocated for it. |
| 333 | The caller is responsible for freeing private data first. */ |
| 334 | |
| 335 | void |
| 336 | remove_process (struct process_info *process) |
| 337 | { |
| 338 | clear_symbol_cache (&process->symbol_cache); |
| 339 | free_all_breakpoints (process); |
| 340 | gdb_assert (find_thread_process (process) == NULL); |
| 341 | remove_inferior (&all_processes, &process->entry); |
| 342 | free (process); |
| 343 | } |
| 344 | |
| 345 | struct process_info * |
| 346 | find_process_pid (int pid) |
| 347 | { |
| 348 | return (struct process_info *) |
| 349 | find_inferior_id (&all_processes, pid_to_ptid (pid)); |
| 350 | } |
| 351 | |
| 352 | /* Wrapper around get_first_inferior to return a struct process_info *. */ |
| 353 | |
| 354 | struct process_info * |
| 355 | get_first_process (void) |
| 356 | { |
| 357 | return (struct process_info *) get_first_inferior (&all_processes); |
| 358 | } |
| 359 | |
| 360 | /* Return non-zero if INF, a struct process_info, was started by us, |
| 361 | i.e. not attached to. */ |
| 362 | |
| 363 | static int |
| 364 | started_inferior_callback (struct inferior_list_entry *entry, void *args) |
| 365 | { |
| 366 | struct process_info *process = (struct process_info *) entry; |
| 367 | |
| 368 | return ! process->attached; |
| 369 | } |
| 370 | |
| 371 | /* Return non-zero if there are any inferiors that we have created |
| 372 | (as opposed to attached-to). */ |
| 373 | |
| 374 | int |
| 375 | have_started_inferiors_p (void) |
| 376 | { |
| 377 | return (find_inferior (&all_processes, started_inferior_callback, NULL) |
| 378 | != NULL); |
| 379 | } |
| 380 | |
| 381 | /* Return non-zero if INF, a struct process_info, was attached to. */ |
| 382 | |
| 383 | static int |
| 384 | attached_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 attached to. */ |
| 392 | |
| 393 | int |
| 394 | have_attached_inferiors_p (void) |
| 395 | { |
| 396 | return (find_inferior (&all_processes, attached_inferior_callback, NULL) |
| 397 | != NULL); |
| 398 | } |
| 399 | |
| 400 | struct process_info * |
| 401 | get_thread_process (struct thread_info *thread) |
| 402 | { |
| 403 | int pid = ptid_get_pid (thread->entry.id); |
| 404 | return find_process_pid (pid); |
| 405 | } |
| 406 | |
| 407 | struct process_info * |
| 408 | current_process (void) |
| 409 | { |
| 410 | gdb_assert (current_thread != NULL); |
| 411 | return get_thread_process (current_thread); |
| 412 | } |