gdb/gdbserver/inferiors.c

   1 /* Inferior process information for the remote server for GDB.
   2    Copyright (C) 2002, 2005, 2007, 2008 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 <stdlib.h>
  22
  23 #include "server.h"
  24
  25 struct thread_info
  26 {
  27   struct inferior_list_entry entry;
  28   void *target_data;
  29   void *regcache_data;
  30   unsigned int gdb_id;
  31 };
  32
  33 struct inferior_list all_threads;
  34 struct inferior_list all_dlls;
  35 int dlls_changed;
  36
  37 struct thread_info *current_inferior;
  38
  39 #define get_thread(inf) ((struct thread_info *)(inf))
  40 #define get_dll(inf) ((struct dll_info *)(inf))
  41
  42 void
  43 add_inferior_to_list (struct inferior_list *list,
  44                       struct inferior_list_entry *new_inferior)
  45 {
  46   new_inferior->next = NULL;
  47   if (list->tail != NULL)
  48     list->tail->next = new_inferior;
  49   else
  50     list->head = new_inferior;
  51   list->tail = new_inferior;
  52 }
  53
  54 void
  55 for_each_inferior (struct inferior_list *list,
  56                    void (*action) (struct inferior_list_entry *))
  57 {
  58   struct inferior_list_entry *cur = list->head, *next;
  59
  60   while (cur != NULL)
  61     {
  62       next = cur->next;
  63       (*action) (cur);
  64       cur = next;
  65     }
  66 }
  67
  68 void
  69 remove_inferior (struct inferior_list *list,
  70                  struct inferior_list_entry *entry)
  71 {
  72   struct inferior_list_entry **cur;
  73
  74   if (list->head == entry)
  75     {
  76       list->head = entry->next;
  77       if (list->tail == entry)
  78         list->tail = list->head;
  79       return;
  80     }
  81
  82   cur = &list->head;
  83   while (*cur && (*cur)->next != entry)
  84     cur = &(*cur)->next;
  85
  86   if (*cur == NULL)
  87     return;
  88
  89   (*cur)->next = entry->next;
  90
  91   if (list->tail == entry)
  92     list->tail = *cur;
  93 }
  94
  95 void
  96 add_thread (unsigned long thread_id, void *target_data, unsigned int gdb_id)
  97 {
  98   struct thread_info *new_thread = xmalloc (sizeof (*new_thread));
  99
 100   memset (new_thread, 0, sizeof (*new_thread));
 101
 102   new_thread->entry.id = thread_id;
 103
 104   add_inferior_to_list (&all_threads, & new_thread->entry);
 105
 106   if (current_inferior == NULL)
 107     current_inferior = new_thread;
 108
 109   new_thread->target_data = target_data;
 110   set_inferior_regcache_data (new_thread, new_register_cache ());
 111   new_thread->gdb_id = gdb_id;
 112 }
 113
 114 unsigned int
 115 thread_id_to_gdb_id (unsigned long thread_id)
 116 {
 117   struct inferior_list_entry *inf = all_threads.head;
 118
 119   while (inf != NULL)
 120     {
 121       struct thread_info *thread = get_thread (inf);
 122       if (inf->id == thread_id)
 123         return thread->gdb_id;
 124       inf = inf->next;
 125     }
 126
 127   return 0;
 128 }
 129
 130 unsigned int
 131 thread_to_gdb_id (struct thread_info *thread)
 132 {
 133   return thread->gdb_id;
 134 }
 135
 136 struct thread_info *
 137 gdb_id_to_thread (unsigned int gdb_id)
 138 {
 139   struct inferior_list_entry *inf = all_threads.head;
 140
 141   while (inf != NULL)
 142     {
 143       struct thread_info *thread = get_thread (inf);
 144       if (thread->gdb_id == gdb_id)
 145         return thread;
 146       inf = inf->next;
 147     }
 148
 149   return NULL;
 150 }
 151
 152 unsigned long
 153 gdb_id_to_thread_id (unsigned int gdb_id)
 154 {
 155   struct thread_info *thread = gdb_id_to_thread (gdb_id);
 156
 157   return thread ? thread->entry.id : 0;
 158 }
 159
 160 static void
 161 free_one_thread (struct inferior_list_entry *inf)
 162 {
 163   struct thread_info *thread = get_thread (inf);
 164   free_register_cache (inferior_regcache_data (thread));
 165   free (thread);
 166 }
 167
 168 void
 169 remove_thread (struct thread_info *thread)
 170 {
 171   remove_inferior (&all_threads, (struct inferior_list_entry *) thread);
 172   free_one_thread (&thread->entry);
 173 }
 174
 175 struct inferior_list_entry *
 176 find_inferior (struct inferior_list *list,
 177                int (*func) (struct inferior_list_entry *, void *), void *arg)
 178 {
 179   struct inferior_list_entry *inf = list->head;
 180
 181   while (inf != NULL)
 182     {
 183       if ((*func) (inf, arg))
 184         return inf;
 185       inf = inf->next;
 186     }
 187
 188   return NULL;
 189 }
 190
 191 struct inferior_list_entry *
 192 find_inferior_id (struct inferior_list *list, unsigned long id)
 193 {
 194   struct inferior_list_entry *inf = list->head;
 195
 196   while (inf != NULL)
 197     {
 198       if (inf->id == id)
 199         return inf;
 200       inf = inf->next;
 201     }
 202
 203   return NULL;
 204 }
 205
 206 void *
 207 inferior_target_data (struct thread_info *inferior)
 208 {
 209   return inferior->target_data;
 210 }
 211
 212 void
 213 set_inferior_target_data (struct thread_info *inferior, void *data)
 214 {
 215   inferior->target_data = data;
 216 }
 217
 218 void *
 219 inferior_regcache_data (struct thread_info *inferior)
 220 {
 221   return inferior->regcache_data;
 222 }
 223
 224 void
 225 set_inferior_regcache_data (struct thread_info *inferior, void *data)
 226 {
 227   inferior->regcache_data = data;
 228 }
 229
 230 static void
 231 free_one_dll (struct inferior_list_entry *inf)
 232 {
 233   struct dll_info *dll = get_dll (inf);
 234   if (dll->name != NULL)
 235     free (dll->name);
 236   free (dll);
 237 }
 238
 239 /* Find a DLL with the same name and/or base address.  A NULL name in
 240    the key is ignored; so is an all-ones base address.  */
 241
 242 static int
 243 match_dll (struct inferior_list_entry *inf, void *arg)
 244 {
 245   struct dll_info *iter = (void *) inf;
 246   struct dll_info *key = arg;
 247
 248   if (key->base_addr != ~(CORE_ADDR) 0
 249       && iter->base_addr == key->base_addr)
 250     return 1;
 251   else if (key->name != NULL
 252            && iter->name != NULL
 253            && strcmp (key->name, iter->name) == 0)
 254     return 1;
 255
 256   return 0;
 257 }
 258
 259 /* Record a newly loaded DLL at BASE_ADDR.  */
 260
 261 void
 262 loaded_dll (const char *name, CORE_ADDR base_addr)
 263 {
 264   struct dll_info *new_dll = xmalloc (sizeof (*new_dll));
 265   memset (new_dll, 0, sizeof (*new_dll));
 266
 267   new_dll->entry.id = -1;
 268
 269   new_dll->name = xstrdup (name);
 270   new_dll->base_addr = base_addr;
 271
 272   add_inferior_to_list (&all_dlls, &new_dll->entry);
 273   dlls_changed = 1;
 274 }
 275
 276 /* Record that the DLL with NAME and BASE_ADDR has been unloaded.  */
 277
 278 void
 279 unloaded_dll (const char *name, CORE_ADDR base_addr)
 280 {
 281   struct dll_info *dll;
 282   struct dll_info key_dll;
 283
 284   /* Be careful not to put the key DLL in any list.  */
 285   key_dll.name = (char *) name;
 286   key_dll.base_addr = base_addr;
 287
 288   dll = (void *) find_inferior (&all_dlls, match_dll, &key_dll);
 289   remove_inferior (&all_dlls, &dll->entry);
 290   free_one_dll (&dll->entry);
 291   dlls_changed = 1;
 292 }
 293
 294 #define clear_list(LIST) \
 295   do { (LIST)->head = (LIST)->tail = NULL; } while (0)
 296
 297 void
 298 clear_inferiors (void)
 299 {
 300   for_each_inferior (&all_threads, free_one_thread);
 301   for_each_inferior (&all_dlls, free_one_dll);
 302
 303   clear_list (&all_threads);
 304   clear_list (&all_dlls);
 305
 306   current_inferior = NULL;
 307 }
 308
 309 /* Two utility functions for a truly degenerate inferior_list: a simple
 310    PID listing.  */
 311
 312 void
 313 add_pid_to_list (struct inferior_list *list, unsigned long pid)
 314 {
 315   struct inferior_list_entry *new_entry;
 316
 317   new_entry = xmalloc (sizeof (struct inferior_list_entry));
 318   new_entry->id = pid;
 319   add_inferior_to_list (list, new_entry);
 320 }
 321
 322 int
 323 pull_pid_from_list (struct inferior_list *list, unsigned long pid)
 324 {
 325   struct inferior_list_entry *new_entry;
 326
 327   new_entry = find_inferior_id (list, pid);
 328   if (new_entry == NULL)
 329     return 0;
 330   else
 331     {
 332       remove_inferior (list, new_entry);
 333       free (new_entry);
 334       return 1;
 335     }
 336 }