target.c

这个是LINUX下的GDB调度工具的源码

/* Target operations for the remote server for GDB.
   Copyright 2002, 2004
   Free Software Foundation, Inc.

   Contributed by MontaVista Software.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "server.h"

struct target_ops *the_target;

void
set_desired_inferior (int use_general)
{
  struct thread_info *found;

  if (use_general == 1)
    {
      found = (struct thread_info *) find_inferior_id (&all_threads,
						       general_thread);
    }
  else
    {
      found = NULL;

      /* If we are continuing any (all) thread(s), use step_thread
	 to decide which thread to step and/or send the specified
	 signal to.  */
      if (step_thread > 0 && (cont_thread == 0 || cont_thread == -1))
	found = (struct thread_info *) find_inferior_id (&all_threads,
							 step_thread);

      if (found == NULL)
	found = (struct thread_info *) find_inferior_id (&all_threads,
							 cont_thread);
    }

  if (found == NULL)
    current_inferior = (struct thread_info *) all_threads.head;
  else
    current_inferior = found;
}

int
read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
{
  int res;
  res = (*the_target->read_memory) (memaddr, myaddr, len);
  check_mem_read (memaddr, myaddr, len);
  return res;
}

int
write_inferior_memory (CORE_ADDR memaddr, const char *myaddr, int len)
{
  /* Lacking cleanups, there is some potential for a memory leak if the
     write fails and we go through error().  Make sure that no more than
     one buffer is ever pending by making BUFFER static.  */
  static char *buffer = 0;
  int res;

  if (buffer != NULL)
    free (buffer);

  buffer = malloc (len);
  memcpy (buffer, myaddr, len);
  check_mem_write (memaddr, buffer, len);
  res = (*the_target->write_memory) (memaddr, buffer, len);
  free (buffer);
  buffer = NULL;

  return res;
}

unsigned char
mywait (char *statusp, int connected_wait)
{
  unsigned char ret;

  if (connected_wait)
    server_waiting = 1;

  ret = (*the_target->wait) (statusp);

  if (connected_wait)
    server_waiting = 0;

  return ret;
}

void
set_target_ops (struct target_ops *target)
{
  the_target = (struct target_ops *) malloc (sizeof (*the_target));
  memcpy (the_target, target, sizeof (*the_target));
}