gnu/dist/gdb6/gdb/gdbserver/target.c

   1 /* Target operations for the remote server for GDB.
   2    Copyright (C) 2002, 2004, 2005
   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 2 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, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #include "server.h"
  25
  26 struct target_ops *the_target;
  27
  28 void
  29 set_desired_inferior (int use_general)
  30 {
  31   struct thread_info *found;
  32
  33   if (use_general == 1)
  34     {
  35       found = (struct thread_info *) find_inferior_id (&all_threads,
  36                                                        general_thread);
  37     }
  38   else
  39     {
  40       found = NULL;
  41
  42       /* If we are continuing any (all) thread(s), use step_thread
  43          to decide which thread to step and/or send the specified
  44          signal to.  */
  45       if ((step_thread != 0 && step_thread != -1)
  46           && (cont_thread == 0 || cont_thread == -1))
  47         found = (struct thread_info *) find_inferior_id (&all_threads,
  48                                                          step_thread);
  49
  50       if (found == NULL)
  51         found = (struct thread_info *) find_inferior_id (&all_threads,
  52                                                          cont_thread);
  53     }
  54
  55   if (found == NULL)
  56     current_inferior = (struct thread_info *) all_threads.head;
  57   else
  58     current_inferior = found;
  59 }
  60
  61 int
  62 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
  63 {
  64   int res;
  65   res = (*the_target->read_memory) (memaddr, myaddr, len);
  66   check_mem_read (memaddr, myaddr, len);
  67   return res;
  68 }
  69
  70 int
  71 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
  72                        int len)
  73 {
  74   /* Lacking cleanups, there is some potential for a memory leak if the
  75      write fails and we go through error().  Make sure that no more than
  76      one buffer is ever pending by making BUFFER static.  */
  77   static unsigned char *buffer = 0;
  78   int res;
  79
  80   if (buffer != NULL)
  81     free (buffer);
  82
  83   buffer = malloc (len);
  84   memcpy (buffer, myaddr, len);
  85   check_mem_write (memaddr, buffer, len);
  86   res = (*the_target->write_memory) (memaddr, buffer, len);
  87   free (buffer);
  88   buffer = NULL;
  89
  90   return res;
  91 }
  92
  93 unsigned char
  94 mywait (char *statusp, int connected_wait)
  95 {
  96   unsigned char ret;
  97
  98   if (connected_wait)
  99     server_waiting = 1;
 100
 101   ret = (*the_target->wait) (statusp);
 102
 103   if (connected_wait)
 104     server_waiting = 0;
 105
 106   return ret;
 107 }
 108
 109 void
 110 set_target_ops (struct target_ops *target)
 111 {
 112   the_target = (struct target_ops *) malloc (sizeof (*the_target));
 113   memcpy (the_target, target, sizeof (*the_target));
 114 }