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/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

******************************************************************************/

#ifndef __ALT_STACK_H__

#define __ALT_STACK_H__

/*

 * alt_stack.h is the nios2 specific implementation of functions used by the

 * stack overflow code.

 */

#include "nios2.h"

#include "alt_types.h"

#ifdef __cplusplus

extern "C"

{

#endif /* __cplusplus */

extern char * alt_stack_limit_value;

#ifdef ALT_EXCEPTION_STACK

extern char __alt_exception_stack_pointer[];  /* set by the linker */

#endif /* ALT_EXCEPTION_STACK */

/*

 * alt_stack_limit can be called to determine the current value of the stack

 * limit register.

 */

static ALT_INLINE char * ALT_ALWAYS_INLINE alt_stack_limit (void)

{

  char * limit;

  NIOS2_READ_ET(limit);

  return limit;

}

/*

 * alt_stack_pointer can be called to determine the current value of the stack

 * pointer register.

 */

static ALT_INLINE char * ALT_ALWAYS_INLINE alt_stack_pointer (void)

{

  char * pointer;

  NIOS2_READ_SP(pointer);

  return pointer;

}

#ifdef ALT_EXCEPTION_STACK

/*

 * alt_exception_stack_pointer returns the normal stack pointer from

 * where it is stored on the exception stack (uppermost 4 bytes).  This

 * is really only useful during exception processing, and is only

 * available if a separate exception stack has been configured.

 */

static ALT_INLINE char * ALT_ALWAYS_INLINE alt_exception_stack_pointer (void)

{

  return (char *) *(alt_u32 *)(__alt_exception_stack_pointer - sizeof(alt_u32));

}

#endif /* ALT_EXCEPTION_STACK */

/*

 * alt_set_stack_limit can be called to update the current value of the stack

 * limit register.

 */

static ALT_INLINE void ALT_ALWAYS_INLINE alt_set_stack_limit (char * limit)

{

  alt_stack_limit_value = limit;

  NIOS2_WRITE_ET(limit);

}

/*

 * alt_report_stack_overflow reports that a stack overflow happened.

 */

static ALT_INLINE void ALT_ALWAYS_INLINE alt_report_stack_overflow (void)

{

  NIOS2_REPORT_STACK_OVERFLOW();

}

#ifdef __cplusplus

}

#endif /* __cplusplus */

#endif /* __ALT_STACK_H__ */