coregrind/m_gdbserver/inferiors.c

   1 /* Inferior process information for the remote server for GDB.
   2    Copyright (C) 2002, 2005, 2011
   3    Free Software Foundation, Inc.
   4
   5    Contributed by MontaVista Software.
   6
   7    This file is part of GDB.
   8    It has been modified to integrate it in valgrind
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23    Boston, MA 02110-1301, USA.  */
  24
  25 #include "server.h"
  26
  27 struct thread_info
  28 {
  29    struct inferior_list_entry entry;
  30    void *target_data;
  31    void *regcache_data;
  32    unsigned int gdb_id;
  33 };
  34
  35 struct inferior_list all_threads;
  36
  37 struct thread_info *current_inferior;
  38
  39 #define get_thread(inf) ((struct thread_info *)(inf))
  40
  41 void add_inferior_to_list (struct inferior_list *list,
  42                       struct inferior_list_entry *new_inferior)
  43 {
  44    new_inferior->next = NULL;
  45    if (list->tail != NULL)
  46       list->tail->next = new_inferior;
  47    else
  48       list->head = new_inferior;
  49    list->tail = new_inferior;
  50 }
  51
  52 void for_each_inferior (struct inferior_list *list,
  53                    void (*action) (struct inferior_list_entry *))
  54 {
  55    struct inferior_list_entry *cur = list->head, *next;
  56
  57    while (cur != NULL) {
  58       next = cur->next;
  59       (*action) (cur);
  60       cur = next;
  61    }
  62 }
  63
  64 void change_inferior_id (struct inferior_list *list,
  65                     unsigned long new_id)
  66 {
  67    if (list->head != list->tail)
  68       error ("tried to change thread ID after multiple threads are created\n");
  69
  70    list->head->id = new_id;
  71 }
  72
  73 void remove_inferior (struct inferior_list *list,
  74                  struct inferior_list_entry *entry)
  75 {
  76    struct inferior_list_entry **cur;
  77
  78    if (list->head == entry) {
  79       list->head = entry->next;
  80       if (list->tail == entry)
  81          list->tail = list->head;
  82       return;
  83    }
  84
  85    cur = &list->head;
  86    while (*cur && (*cur)->next != entry)
  87       cur = &(*cur)->next;
  88
  89    if (*cur == NULL)
  90       return;
  91
  92    (*cur)->next = entry->next;
  93
  94    if (list->tail == entry)
  95       list->tail = *cur;
  96 }
  97
  98 void add_thread (unsigned long thread_id, void *target_data, unsigned int gdb_id)
  99 {
 100    struct thread_info *new_thread
 101       = (struct thread_info *) malloc (sizeof (*new_thread));
 102
 103    VG_(memset) (new_thread, 0, sizeof (*new_thread));
 104
 105    new_thread->entry.id = thread_id;
 106
 107    add_inferior_to_list (&all_threads, & new_thread->entry);
 108
 109    if (current_inferior == NULL)
 110       current_inferior = new_thread;
 111
 112    new_thread->target_data = target_data;
 113    set_inferior_regcache_data (new_thread, new_register_cache ());
 114    new_thread->gdb_id = gdb_id;
 115 }
 116
 117 unsigned int thread_id_to_gdb_id (unsigned long thread_id)
 118 {
 119    struct inferior_list_entry *inf = all_threads.head;
 120
 121    while (inf != NULL) {
 122       struct thread_info *thread = get_thread (inf);
 123       if (inf->id == thread_id)
 124          return thread->gdb_id;
 125       inf = inf->next;
 126    }
 127
 128    return 0;
 129 }
 130
 131 unsigned int thread_to_gdb_id (struct thread_info *thread)
 132 {
 133    return thread->gdb_id;
 134 }
 135
 136 struct thread_info * gdb_id_to_thread (unsigned int gdb_id)
 137 {
 138    struct inferior_list_entry *inf = all_threads.head;
 139
 140    while (inf != NULL) {
 141       struct thread_info *thread = get_thread (inf);
 142       if (thread->gdb_id == gdb_id)
 143          return thread;
 144       inf = inf->next;
 145    }
 146
 147    return NULL;
 148 }
 149
 150 unsigned long gdb_id_to_thread_id (unsigned int gdb_id)
 151 {
 152    struct thread_info *thread = gdb_id_to_thread (gdb_id);
 153
 154    return thread ? thread->entry.id : 0;
 155 }
 156
 157 static
 158 void free_one_thread (struct inferior_list_entry *inf)
 159 {
 160    struct thread_info *thread = get_thread (inf);
 161    free_register_cache (inferior_regcache_data (thread));
 162    free (thread);
 163 }
 164
 165 void remove_thread (struct thread_info *thread)
 166 {
 167    remove_inferior (&all_threads, (struct inferior_list_entry *) thread);
 168    free_one_thread (&thread->entry);
 169 }
 170
 171 void clear_inferiors (void)
 172 {
 173    for_each_inferior (&all_threads, free_one_thread);
 174
 175    all_threads.head = all_threads.tail = NULL;
 176 }
 177
 178 struct inferior_list_entry * find_inferior (struct inferior_list *list,
 179                                             int (*func)
 180                                               (struct inferior_list_entry *,
 181                                                void *),
 182                                             void *arg)
 183 {
 184    struct inferior_list_entry *inf = list->head;
 185
 186    while (inf != NULL) {
 187       if ((*func) (inf, arg))
 188          return inf;
 189       inf = inf->next;
 190    }
 191
 192    return NULL;
 193 }
 194
 195 struct inferior_list_entry * find_inferior_id (struct inferior_list *list,
 196                                                unsigned long id)
 197 {
 198    struct inferior_list_entry *inf = list->head;
 199
 200    while (inf != NULL) {
 201       if (inf->id == id)
 202          return inf;
 203       inf = inf->next;
 204    }
 205
 206    return NULL;
 207 }
 208
 209 void * inferior_target_data (struct thread_info *inferior)
 210 {
 211    return inferior->target_data;
 212 }
 213
 214 void set_inferior_target_data (struct thread_info *inferior, void *data)
 215 {
 216    inferior->target_data = data;
 217 }
 218
 219 void * inferior_regcache_data (struct thread_info *inferior)
 220 {
 221    return inferior->regcache_data;
 222 }
 223
 224 void set_inferior_regcache_data (struct thread_info *inferior, void *data)
 225 {
 226    inferior->regcache_data = data;
 227 }