gdb/gdbserver/dll.c

   1 /* Copyright (C) 2002-2016 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 /* An "unspecified" CORE_ADDR, for match_dll.  */
  24 #define UNSPECIFIED_CORE_ADDR (~(CORE_ADDR) 0)
  25
  26 struct inferior_list all_dlls;
  27 int dlls_changed;
  28
  29 static void
  30 free_one_dll (struct inferior_list_entry *inf)
  31 {
  32   struct dll_info *dll = get_dll (inf);
  33   if (dll->name != NULL)
  34     free (dll->name);
  35   free (dll);
  36 }
  37
  38 /* Find a DLL with the same name and/or base address.  A NULL name in
  39    the key is ignored; so is an all-ones base address.  */
  40
  41 static int
  42 match_dll (struct inferior_list_entry *inf, void *arg)
  43 {
  44   struct dll_info *iter = (struct dll_info *) inf;
  45   struct dll_info *key = (struct dll_info *) arg;
  46
  47   if (key->base_addr != UNSPECIFIED_CORE_ADDR
  48       && iter->base_addr == key->base_addr)
  49     return 1;
  50   else if (key->name != NULL
  51            && iter->name != NULL
  52            && strcmp (key->name, iter->name) == 0)
  53     return 1;
  54
  55   return 0;
  56 }
  57
  58 /* Record a newly loaded DLL at BASE_ADDR.  */
  59
  60 void
  61 loaded_dll (const char *name, CORE_ADDR base_addr)
  62 {
  63   struct dll_info *new_dll = XCNEW (struct dll_info);
  64
  65   new_dll->entry.id = minus_one_ptid;
  66
  67   new_dll->name = xstrdup (name);
  68   new_dll->base_addr = base_addr;
  69
  70   add_inferior_to_list (&all_dlls, &new_dll->entry);
  71   dlls_changed = 1;
  72 }
  73
  74 /* Record that the DLL with NAME and BASE_ADDR has been unloaded.  */
  75
  76 void
  77 unloaded_dll (const char *name, CORE_ADDR base_addr)
  78 {
  79   struct dll_info *dll;
  80   struct dll_info key_dll;
  81
  82   /* Be careful not to put the key DLL in any list.  */
  83   key_dll.name = (char *) name;
  84   key_dll.base_addr = base_addr;
  85
  86   dll = (struct dll_info *) find_inferior (&all_dlls, match_dll, &key_dll);
  87
  88   if (dll == NULL)
  89     /* For some inferiors we might get unloaded_dll events without having
  90        a corresponding loaded_dll.  In that case, the dll cannot be found
  91        in ALL_DLL, and there is nothing further for us to do.
  92
  93        This has been observed when running 32bit executables on Windows64
  94        (i.e. through WOW64, the interface between the 32bits and 64bits
  95        worlds).  In that case, the inferior always does some strange
  96        unloading of unnamed dll.  */
  97     return;
  98   else
  99     {
 100       /* DLL has been found so remove the entry and free associated
 101          resources.  */
 102       remove_inferior (&all_dlls, &dll->entry);
 103       free_one_dll (&dll->entry);
 104       dlls_changed = 1;
 105     }
 106 }
 107
 108 void
 109 clear_dlls (void)
 110 {
 111   for_each_inferior (&all_dlls, free_one_dll);
 112   clear_inferior_list (&all_dlls);
 113 }