gdb/gdbserver/target.c

   1 /* Target operations for the remote server for GDB.
   2    Copyright (C) 2002, 2004, 2005, 2007, 2008, 2009
   3    Free Software Foundation, Inc.
   4
   5    Contributed by MontaVista Software.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "server.h"
  23
  24 struct target_ops *the_target;
  25
  26 void
  27 set_desired_inferior (int use_general)
  28 {
  29   struct thread_info *found;
  30
  31   if (use_general == 1)
  32     {
  33       found = (struct thread_info *) find_inferior_id (&all_threads,
  34                                                        general_thread);
  35     }
  36   else
  37     {
  38       found = NULL;
  39
  40       /* If we are continuing any (all) thread(s), use step_thread
  41          to decide which thread to step and/or send the specified
  42          signal to.  */
  43       if ((step_thread != 0 && step_thread != -1)
  44           && (cont_thread == 0 || cont_thread == -1))
  45         found = (struct thread_info *) find_inferior_id (&all_threads,
  46                                                          step_thread);
  47
  48       if (found == NULL)
  49         found = (struct thread_info *) find_inferior_id (&all_threads,
  50                                                          cont_thread);
  51     }
  52
  53   if (found == NULL)
  54     current_inferior = (struct thread_info *) all_threads.head;
  55   else
  56     current_inferior = found;
  57 }
  58
  59 int
  60 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
  61 {
  62   int res;
  63   res = (*the_target->read_memory) (memaddr, myaddr, len);
  64   check_mem_read (memaddr, myaddr, len);
  65   return res;
  66 }
  67
  68 int
  69 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
  70                        int len)
  71 {
  72   /* Lacking cleanups, there is some potential for a memory leak if the
  73      write fails and we go through error().  Make sure that no more than
  74      one buffer is ever pending by making BUFFER static.  */
  75   static unsigned char *buffer = 0;
  76   int res;
  77
  78   if (buffer != NULL)
  79     free (buffer);
  80
  81   buffer = xmalloc (len);
  82   memcpy (buffer, myaddr, len);
  83   check_mem_write (memaddr, buffer, len);
  84   res = (*the_target->write_memory) (memaddr, buffer, len);
  85   free (buffer);
  86   buffer = NULL;
  87
  88   return res;
  89 }
  90
  91 unsigned long
  92 mywait (struct target_waitstatus *ourstatus, int connected_wait)
  93 {
  94   unsigned long ret;
  95
  96   if (connected_wait)
  97     server_waiting = 1;
  98
  99   ret = (*the_target->wait) (ourstatus);
 100
 101   if (connected_wait)
 102     server_waiting = 0;
 103
 104   return ret;
 105 }
 106
 107 void
 108 set_target_ops (struct target_ops *target)
 109 {
 110   the_target = (struct target_ops *) xmalloc (sizeof (*the_target));
 111   memcpy (the_target, target, sizeof (*the_target));
 112 }