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

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2008 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.              *

*                                                                             *

* Altera does not recommend, suggest or require that this reference design    *

* file be used in conjunction or combination with any other product.          *

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

#include "sys/alt_exceptions.h"

#include "alt_types.h"

#include "system.h"

/*

 * This file implements support for calling user-registered handlers for

 * instruction-generated exceptions.

 *

 * The registry API is optionally enabled through the "Enable

 * Instruction-related Exception API" HAL BSP setting, which will

 * define the macro below.

 */

#ifdef ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API

/*

 * The header, alt_exception_handler_registry.h contains a struct describing

 * the registered exception handler

 */

#include "priv/alt_exception_handler_registry.h"

/*

 * Pull in the exception entry assembly code. This will not be linked in

 * unless this object is linked into the executable (i.e. only if

 * alt_instruction_exception_register() is called).

 */

__asm__( "\n\t.globl alt_exception" );

/*

 * alt_instruction_exception_register() is called to register a handler to

 * service instruction-generated exceptions that are not handled by the

 * default exception handler code (interrupts, and optionally unimplemented

 * instructions and traps).

 *

 * Passing null (0x0) in the handler argument will disable a previously-

 * registered handler.

 *

 * Note that if no handler is registered, exceptions that are not processed

 * using the built-in handler (interrupts, and optionally unimplemented

 * instructions and traps) are treated as unknown exceptions, resulting

 * in either a break or an infinite loop.

 */

void alt_instruction_exception_register (

  alt_exception_result (*exception_handler)(

    alt_exception_cause cause,

    alt_u32 exception_pc,

    alt_u32 bad_addr) )

{

  alt_instruction_exception_handler = exception_handler;

}

#endif /* ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API */