//==========================================================================
//
//      breakpoints.c
//
//      Support aribtrary set of breakpoints.
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    
// Contributors: gthomas
// Date:         1999-10-20
// Purpose:      
// Description:  
//               
//
//####DESCRIPTIONEND####
//
//=========================================================================

#include <stdlib.h>
#ifdef HAVE_BSP
#include <bsp/bsp.h>
#include <bsp/cpu.h>
#endif

#include "monitor.h"
#include "tservice.h"
#include "stub-tservice.h"

#include "fmt_util.h"


static struct bp *last_bp_ptr;
static struct bp *first_bp_ptr;

#ifdef NO_MALLOC
static struct bp *free_bp_list;
static struct bp bp_list[MAX_NUM_BP];
static int       curr_bp_num;
#endif

int
add_mon_breakpoint (mem_addr_t location)
{
  struct bp *ptr;
  struct bp *new_bp_ptr;

  for (ptr = first_bp_ptr; ptr != NULL; ptr = ptr->next)
    {
      if (MEM_ADDR_EQ_P (ptr->address, location))
	return 1;
    }
#ifdef NO_MALLOC
  if (free_bp_list != NULL)
    {
      new_bp_ptr = free_bp_list;
      free_bp_list = new_bp_ptr->next;
    }
  else
    {
      if (curr_bp_num < MAX_NUM_BP)
	{
	  new_bp_ptr = &bp_list[curr_bp_num++];
	}
      else
	{
	  xprintf ("No more breakpoints\n");
	  return 1;
	}
    }
#else
  new_bp_ptr = (struct bp *)malloc (sizeof (struct bp));
#endif

  if (first_bp_ptr == NULL)
    {
      first_bp_ptr = new_bp_ptr;
    }
  else
    {
      last_bp_ptr->next = new_bp_ptr;
    }
  last_bp_ptr = new_bp_ptr;

  last_bp_ptr->next = NULL;
  last_bp_ptr->address = location;
  last_bp_ptr->in_memory = 0;
  return 0;
}


void
install_breakpoints (void)
{
  struct bp *ptr = first_bp_ptr;
  while (ptr != NULL)
    {
      set_breakpoint (ptr);
      ptr = ptr->next;
    }
}


void
clear_breakpoints (void)
{
  struct bp *ptr = first_bp_ptr;

  while (ptr != NULL)
    {
      clear_breakpoint (ptr);
      ptr = ptr->next;
    }
}

int
show_breakpoints (void)
{
  struct bp *ptr;

  for (ptr = first_bp_ptr; ptr != NULL; ptr = ptr->next)
    {
      char buf[20];

      addr2str (&ptr->address, buf);
      xprintf ("%s\n", buf);
    }
  
  return 0;
}



int 
clear_mon_breakpoint (mem_addr_t location)
{
  int error = 0;
  struct bp *ptr = first_bp_ptr;
  struct bp *prev_ptr = NULL;

  /* Scan the list looking for the address to clear */
  while (ptr != NULL && !MEM_ADDR_EQ_P (ptr->address, location))
    {
      /* keep a pointer one behind the current position */
      prev_ptr = ptr;
      ptr = ptr->next;
    }
  if (ptr == NULL)
    {
      xprintf ("That address has no breakpoint on it.\n");
      error = 1;
    }
  else
    {
      /* Just in case it's still in memory. */
      clear_breakpoint (ptr);

      /* now we'll point the previous bp->next at the one after the one 
	 we're deleting, unless there is no previous bp. */
      if (prev_ptr != NULL)
	{
	  prev_ptr->next = ptr->next;
	}

      if (first_bp_ptr == ptr)
	first_bp_ptr = ptr->next;

      if (last_bp_ptr == ptr)
	last_bp_ptr = prev_ptr;

      /* eliminate the offending bp struct */
#ifdef NO_MALLOC
      ptr->next = free_bp_list;
      free_bp_list = ptr;
#else
      free (ptr);
#endif
    }
  return error;
}	

