gdb/gdbserver/dll.c

   1 /* Copyright (C) 2002-2013 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "server.h"
  19 #include "dll.h"
  20
  21 #define get_dll(inf) ((struct dll_info *)(inf))
  22
  23 struct inferior_list all_dlls;
  24 int dlls_changed;
  25
  26 static void
  27 free_one_dll (struct inferior_list_entry *inf)
  28 {
  29   struct dll_info *dll = get_dll (inf);
  30   if (dll->name != NULL)
  31     free (dll->name);
  32   free (dll);
  33 }
  34
  35 /* Find a DLL with the same name and/or base address.  A NULL name in
  36    the key is ignored; so is an all-ones base address.  */
  37
  38 static int
  39 match_dll (struct inferior_list_entry *inf, void *arg)
  40 {
  41   struct dll_info *iter = (void *) inf;
  42   struct dll_info *key = arg;
  43
  44   if (key->base_addr != ~(CORE_ADDR) 0
  45       && iter->base_addr == key->base_addr)
  46     return 1;
  47   else if (key->name != NULL
  48            && iter->name != NULL
  49            && strcmp (key->name, iter->name) == 0)
  50     return 1;
  51
  52   return 0;
  53 }
  54
  55 /* Record a newly loaded DLL at BASE_ADDR.  */
  56
  57 void
  58 loaded_dll (const char *name, CORE_ADDR base_addr)
  59 {
  60   struct dll_info *new_dll = xmalloc (sizeof (*new_dll));
  61   memset (new_dll, 0, sizeof (*new_dll));
  62
  63   new_dll->entry.id = minus_one_ptid;
  64
  65   new_dll->name = xstrdup (name);
  66   new_dll->base_addr = base_addr;
  67
  68   add_inferior_to_list (&all_dlls, &new_dll->entry);
  69   dlls_changed = 1;
  70 }
  71
  72 /* Record that the DLL with NAME and BASE_ADDR has been unloaded.  */
  73
  74 void
  75 unloaded_dll (const char *name, CORE_ADDR base_addr)
  76 {
  77   struct dll_info *dll;
  78   struct dll_info key_dll;
  79
  80   /* Be careful not to put the key DLL in any list.  */
  81   key_dll.name = (char *) name;
  82   key_dll.base_addr = base_addr;
  83
  84   dll = (void *) find_inferior (&all_dlls, match_dll, &key_dll);
  85
  86   if (dll == NULL)
  87     /* For some inferiors we might get unloaded_dll events without having
  88        a corresponding loaded_dll.  In that case, the dll cannot be found
  89        in ALL_DLL, and there is nothing further for us to do.
  90
  91        This has been observed when running 32bit executables on Windows64
  92        (i.e. through WOW64, the interface between the 32bits and 64bits
  93        worlds).  In that case, the inferior always does some strange
  94        unloading of unnamed dll.  */
  95     return;
  96   else
  97     {
  98       /* DLL has been found so remove the entry and free associated
  99          resources.  */
 100       remove_inferior (&all_dlls, &dll->entry);
 101       free_one_dll (&dll->entry);
 102       dlls_changed = 1;
 103     }
 104 }
 105
 106 void
 107 clear_dlls (void)
 108 {
 109   for_each_inferior (&all_dlls, free_one_dll);
 110   all_dlls.head = all_dlls.tail = NULL;
 111 }