/***************************************************************************
 * z16f/z16f_sysexec.c
 *
 *   Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ***************************************************************************/

/***************************************************************************
 * Included Files
 ***************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <debug.h>

#include <nuttx/arch.h>

#include "chip/chip.h"
#include "os_internal.h"
#include "up_internal.h"

/***************************************************************************
 * Definitions
 ***************************************************************************/

#ifdef CONFIG_ARCH_LOWPUTC
#  define SYSDBG lib_lowprintf
#else
#  define SYSDBG lib_rawprintf
#endif

/***************************************************************************
 * Private Types
 ***************************************************************************/

/***************************************************************************
 * Private Functions
 ***************************************************************************/

/***************************************************************************
 * Global Functions
 ***************************************************************************/

/***************************************************************************
 * Function:  z16f_sysexec
 *
 * Description:
 *   Handle a Z16F system execption
 *
 ***************************************************************************/

void z16f_sysexec(FAR chipreg_t *regs)
{
  int errcode = OSERR_ERREXCEPTION;
  uint16_t excp;
  
  /* Save that register reference so that it can be used for built-in
   * diagnostics.
   */

  current_regs = regs;
 
  /* The cause of the system exception is indicated in the SYSEXCPH&L
   * registers
   */

  excp = getreg16(Z16F_SYSEXCP);
  if ((excp & Z16F_SYSEXCP_SPOVF) != 0)
    {
      SYSDBG("SP OVERFLOW\n");
    }
  if ((excp & Z16F_SYSEXCP_PCOVF) != 0)
    {
      SYSDBG("PC OVERFLOW\n");
    }
  if ((excp & Z16F_SYSEXCP_DIV0) != 0)
    {
      SYSDBG("Divide by zero\n");
    }
  if ((excp & Z16F_SYSEXCP_DIVOVF) != 0)
    {
      SYSDBG("Divide overflow\n");
    }
  if ((excp & Z16F_SYSEXCP_ILL) != 0)
    {
      SYSDBG("Illegal instruction\n");
      errcode = OSERR_UNDEFINEDINSN;
    }
  if ((excp & Z16F_SYSEXCP_WDTOSC) != 0)
    {
      SYSDBG("WDT oscillator failure\n");
    }
  if ((excp & Z16F_SYSEXCP_PRIOSC) != 0)
    {
      SYSDBG("Primary Oscillator Failure\n");
    }
  if ((excp & Z16F_SYSEXCP_WDT) != 0)
    {
      SYSDBG("Watchdog timeout\n");
      z16f_reset();
    }
  PANIC(errcode);
}