xil_exception.c

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/* $Id: xil_exception.c,v 1.1.4.1 2011/10/24 09:35:15 sadanan Exp $ */
/*****************************************************************************
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******************************************************************************/
/****************************************************************************/
/**
*
* @file xil_exception.c
*
* This file contains low-level driver functions for the Cortex A9 exception
* Handler.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who      Date     Changes
* ----- -------- -------- -----------------------------------------------
* 1.00a ecm/sdm  11/04/09 First release
* 3.05a sdm	 02/02/12 Updated to resiter a null handler only if a handler
*			  is not already registered
* </pre>
*
*****************************************************************************/

/***************************** Include Files ********************************/

#include "xil_types.h"
#include "xil_assert.h"
#include "xil_exception.h"
#include "xpseudo_asm.h"

/************************** Constant Definitions ****************************/

/**************************** Type Definitions ******************************/

typedef struct {
	Xil_ExceptionHandler Handler;
	void *Data;
} XExc_VectorTableEntry;

/***************** Macros (Inline Functions) Definitions ********************/

/************************** Function Prototypes *****************************/

/************************** Variable Definitions *****************************/
/*
 * Exception vector table to store handlers for each exception vector.
 */
XExc_VectorTableEntry XExc_VectorTable[XIL_EXCEPTION_ID_LAST + 1];

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

/****************************************************************************/
/**
*
* This function is a stub Handler that is the default Handler that gets called
* if the application has not setup a Handler for a specific  exception. The
* function interface has to match the interface specified for a Handler even
* though none of the arguments are used.
*
* @param	Data is unused by this function.
*
* @return	None.
*
* @note		None.
*
*****************************************************************************/
static void Xil_ExceptionNullHandler(void *Data)
{
	(void)Data;
DieLoop: goto DieLoop;
}

/****************************************************************************/
/**
*
* Initialize exception handling for the Processor. The exception vector table
* is setup with the stub Handler for all exceptions.
*
* @param	None.
*
* @return	None.
*
* @note		None.
*
*****************************************************************************/
void Xil_ExceptionInit(void)
{
	unsigned long index;

	/*
	 * Initialize the vector table. Register the stub Handler for each
	 * exception.
	 */
	for(index = XIL_EXCEPTION_ID_FIRST; index < XIL_EXCEPTION_ID_LAST + 1;
	    index++) {
		if (XExc_VectorTable[index].Handler == NULL) {
			Xil_ExceptionRegisterHandler(index,
						     Xil_ExceptionNullHandler,
						     NULL);
		}
	}
}

/*****************************************************************************/
/**
*
* Makes the connection between the Id of the exception source and the
* associated Handler that is to run when the exception is recognized. The
* argument provided in this call as the Data is used as the argument
* for the Handler when it is called.
*
* @param	exception_id contains the ID of the exception source and should
*		be in the range of 0 to XIL_EXCEPTION_ID_LAST.
		See xil_exception_l.h for further information.
* @param	Handler to the Handler for that exception.
* @param	Data is a reference to Data that will be passed to the
*		Handler when it gets called.
*
* @return	None.
*
* @note		None.
*
****************************************************************************/
void Xil_ExceptionRegisterHandler(u32 exception_id,
				    Xil_ExceptionHandler Handler,
				    void *Data)
{
	XExc_VectorTable[exception_id].Handler = Handler;
	XExc_VectorTable[exception_id].Data = Data;
}

/*****************************************************************************/
/**
*
* Removes the Handler for a specific exception Id. The stub Handler is then
* registered for this exception Id.
*
* @param	exception_id contains the ID of the exception source and should
*		be in the range of 0 to XIL_EXCEPTION_ID_LAST.
*		See xil_exception_l.h for further information.

* @return	None.
*
* @note		None.
*
****************************************************************************/
void Xil_ExceptionRemoveHandler(u32 exception_id)
{
	Xil_ExceptionRegisterHandler(exception_id,
				       Xil_ExceptionNullHandler,
				       NULL);
}