FreeRTOS/Source/portable/GCC/MicroBlazeV8/port_exceptions.c - third_party/github/FreeRTOS/FreeRTOS-Kernel - Git at Google

 /*
     FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.

     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

     ***************************************************************************
      *                                                                       *
      *    FreeRTOS provides completely free yet professionally developed,    *
      *    robust, strictly quality controlled, supported, and cross          *
      *    platform software that has become a de facto standard.             *
      *                                                                       *
      *    Help yourself get started quickly and support the FreeRTOS         *
      *    project by purchasing a FreeRTOS tutorial book, reference          *
      *    manual, or both from: http://www.FreeRTOS.org/Documentation        *
      *                                                                       *
      *    Thank you!                                                         *
      *                                                                       *
     ***************************************************************************

     This file is part of the FreeRTOS distribution.

     FreeRTOS is free software; you can redistribute it and/or modify it under
     the terms of the GNU General Public License (version 2) as published by the
     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.

     >>! NOTE: The modification to the GPL is included to allow you to distribute
     >>! a combined work that includes FreeRTOS without being obliged to provide
     >>! the source code for proprietary components outside of the FreeRTOS
     >>! kernel.

     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     FOR A PARTICULAR PURPOSE.  Full license text is available from the following
     link: http://www.freertos.org/a00114.html

     1 tab == 4 spaces!

     ***************************************************************************
      *                                                                       *
      *    Having a problem?  Start by reading the FAQ "My application does   *
      *    not run, what could be wrong?"                                     *
      *                                                                       *
      *    http://www.FreeRTOS.org/FAQHelp.html                               *
      *                                                                       *
     ***************************************************************************

     http://www.FreeRTOS.org - Documentation, books, training, latest versions,
     license and Real Time Engineers Ltd. contact details.

     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
     including FreeRTOS+Trace - an indispensable productivity tool, a DOS
     compatible FAT file system, and our tiny thread aware UDP/IP stack.

     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
     Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS
     licenses offer ticketed support, indemnification and middleware.

     http://www.SafeRTOS.com - High Integrity Systems also provide a safety
     engineered and independently SIL3 certified version for use in safety and
     mission critical applications that require provable dependability.

     1 tab == 4 spaces!
 */

 /* Scheduler includes. */
 #include "FreeRTOS.h"
 #include "task.h"

 /* Hardware includes. */
 #include <microblaze_exceptions_i.h>
 #include <microblaze_exceptions_g.h>

 /* The Xilinx library defined exception entry point stacks a number of
 registers.  These definitions are offsets from the stack pointer to the various
 stacked register values. */
 #define portexR3_STACK_OFFSET	4
 #define portexR4_STACK_OFFSET	5
 #define portexR5_STACK_OFFSET	6
 #define portexR6_STACK_OFFSET	7
 #define portexR7_STACK_OFFSET	8
 #define portexR8_STACK_OFFSET	9
 #define portexR9_STACK_OFFSET	10
 #define portexR10_STACK_OFFSET	11
 #define portexR11_STACK_OFFSET	12
 #define portexR12_STACK_OFFSET	13
 #define portexR15_STACK_OFFSET	16
 #define portexR18_STACK_OFFSET  19
 #define portexMSR_STACK_OFFSET	20
 #define portexR19_STACK_OFFSET  -1

 /* This is defined to equal the size, in bytes, of the stack frame generated by
 the Xilinx standard library exception entry point.  It is required to determine
 the stack pointer value prior to the exception being entered. */
 #define portexASM_HANDLER_STACK_FRAME_SIZE 84UL

 /* The number of bytes a MicroBlaze instruction consumes. */
 #define portexINSTRUCTION_SIZE	4

 /* Exclude this entire file if the MicroBlaze is not configured to handle
 exceptions, or the application defined configuration constant
 configINSTALL_EXCEPTION_HANDLERS is not set to 1. */
 #if ( MICROBLAZE_EXCEPTIONS_ENABLED == 1 ) && ( configINSTALL_EXCEPTION_HANDLERS == 1 )

 /* This variable is set in the exception entry code, before
 vPortExceptionHandler is called. */
 unsigned long *pulStackPointerOnFunctionEntry = NULL;

 /* This is the structure that is filled with the MicroBlaze context as it
 existed immediately prior to the exception occurrence.  A pointer to this
 structure is passed into the vApplicationExceptionRegisterDump() callback
 function, if one is defined. */
 static xPortRegisterDump xRegisterDump;

 /* This is the FreeRTOS exception handler that is installed for all exception
 types.  It is called from vPortExceptionHanlderEntry() - which is itself defined
 in portasm.S. */
 void vPortExceptionHandler( void *pvExceptionID );
 extern void vPortExceptionHandlerEntry( void *pvExceptionID );

 /*-----------------------------------------------------------*/

 /* vApplicationExceptionRegisterDump() is a callback function that the
 application can optionally define to receive a populated xPortRegisterDump
 structure.  If the application chooses not to define a version of
 vApplicationExceptionRegisterDump() then this weekly defined default
 implementation will be called instead. */
 extern void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump ) __attribute__((weak));
 void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump )
 {
 	( void ) xRegisterDump;

 	for( ;; )
 	{
 		portNOP();
 	}
 }
 /*-----------------------------------------------------------*/

 void vPortExceptionHandler( void *pvExceptionID )
 {
 extern void *pxCurrentTCB;

 	/* Fill an xPortRegisterDump structure with the MicroBlaze context as it
 	was immediately before the exception occurrence. */

 	/* First fill in the name and handle of the task that was in the Running
 	state when the exception occurred. */
 	xRegisterDump.xCurrentTaskHandle = pxCurrentTCB;
 	xRegisterDump.pcCurrentTaskName = pcTaskGetTaskName( NULL );

 	configASSERT( pulStackPointerOnFunctionEntry );

 	/* Obtain the values of registers that were stacked prior to this function
 	being called, and may have changed since they were stacked. */
 	xRegisterDump.ulR3 = pulStackPointerOnFunctionEntry[ portexR3_STACK_OFFSET ];
 	xRegisterDump.ulR4 = pulStackPointerOnFunctionEntry[ portexR4_STACK_OFFSET ];
 	xRegisterDump.ulR5 = pulStackPointerOnFunctionEntry[ portexR5_STACK_OFFSET ];
 	xRegisterDump.ulR6 = pulStackPointerOnFunctionEntry[ portexR6_STACK_OFFSET ];
 	xRegisterDump.ulR7 = pulStackPointerOnFunctionEntry[ portexR7_STACK_OFFSET ];
 	xRegisterDump.ulR8 = pulStackPointerOnFunctionEntry[ portexR8_STACK_OFFSET ];
 	xRegisterDump.ulR9 = pulStackPointerOnFunctionEntry[ portexR9_STACK_OFFSET ];
 	xRegisterDump.ulR10 = pulStackPointerOnFunctionEntry[ portexR10_STACK_OFFSET ];
 	xRegisterDump.ulR11 = pulStackPointerOnFunctionEntry[ portexR11_STACK_OFFSET ];
 	xRegisterDump.ulR12 = pulStackPointerOnFunctionEntry[ portexR12_STACK_OFFSET ];
 	xRegisterDump.ulR15_return_address_from_subroutine = pulStackPointerOnFunctionEntry[ portexR15_STACK_OFFSET ];
 	xRegisterDump.ulR18 = pulStackPointerOnFunctionEntry[ portexR18_STACK_OFFSET ];
 	xRegisterDump.ulR19 = pulStackPointerOnFunctionEntry[ portexR19_STACK_OFFSET ];
 	xRegisterDump.ulMSR = pulStackPointerOnFunctionEntry[ portexMSR_STACK_OFFSET ];

 	/* Obtain the value of all other registers. */
 	xRegisterDump.ulR2_small_data_area = mfgpr( R2 );
 	xRegisterDump.ulR13_read_write_small_data_area = mfgpr( R13 );
 	xRegisterDump.ulR14_return_address_from_interrupt = mfgpr( R14 );
 	xRegisterDump.ulR16_return_address_from_trap = mfgpr( R16 );
 	xRegisterDump.ulR17_return_address_from_exceptions = mfgpr( R17 );
 	xRegisterDump.ulR20 = mfgpr( R20 );
 	xRegisterDump.ulR21 = mfgpr( R21 );
 	xRegisterDump.ulR22 = mfgpr( R22 );
 	xRegisterDump.ulR23 = mfgpr( R23 );
 	xRegisterDump.ulR24 = mfgpr( R24 );
 	xRegisterDump.ulR25 = mfgpr( R25 );
 	xRegisterDump.ulR26 = mfgpr( R26 );
 	xRegisterDump.ulR27 = mfgpr( R27 );
 	xRegisterDump.ulR28 = mfgpr( R28 );
 	xRegisterDump.ulR29 = mfgpr( R29 );
 	xRegisterDump.ulR30 = mfgpr( R30 );
 	xRegisterDump.ulR31 = mfgpr( R31 );
 	xRegisterDump.ulR1_SP = ( ( unsigned long ) pulStackPointerOnFunctionEntry ) + portexASM_HANDLER_STACK_FRAME_SIZE;
 	xRegisterDump.ulEAR = mfear();
 	xRegisterDump.ulESR = mfesr();
 	xRegisterDump.ulEDR = mfedr();

 	/* Move the saved program counter back to the instruction that was executed
 	when the exception occurred.  This is only valid for certain types of
 	exception. */
 	xRegisterDump.ulPC = xRegisterDump.ulR17_return_address_from_exceptions - portexINSTRUCTION_SIZE;

 	#if XPAR_MICROBLAZE_0_USE_FPU == 1
 	{
 		xRegisterDump.ulFSR = mffsr();
 	}
 	#else
 	{
 		xRegisterDump.ulFSR = 0UL;
 	}
 	#endif

 	/* Also fill in a string that describes what type of exception this is.
 	The string uses the same ID names as defined in the MicroBlaze standard
 	library exception header files. */
 	switch( ( unsigned long ) pvExceptionID )
 	{
 		case XEXC_ID_FSL :
 				xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_FSL";
 				break;

 		case XEXC_ID_UNALIGNED_ACCESS :
 				xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_UNALIGNED_ACCESS";
 				break;

 		case XEXC_ID_ILLEGAL_OPCODE :
 				xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_ILLEGAL_OPCODE";
 				break;

 		case XEXC_ID_M_AXI_I_EXCEPTION :
 				xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_M_AXI_I_EXCEPTION or XEXC_ID_IPLB_EXCEPTION";
 				break;

 		case XEXC_ID_M_AXI_D_EXCEPTION :
 				xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_M_AXI_D_EXCEPTION or XEXC_ID_DPLB_EXCEPTION";
 				break;

 		case XEXC_ID_DIV_BY_ZERO :
 				xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_DIV_BY_ZERO";
 				break;

 		case XEXC_ID_STACK_VIOLATION :
 				xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_STACK_VIOLATION or XEXC_ID_MMU";
 				break;

 		#if XPAR_MICROBLAZE_0_USE_FPU == 1

 			case XEXC_ID_FPU :
 						xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_FPU see ulFSR value";
 						break;

 		#endif /* XPAR_MICROBLAZE_0_USE_FPU */
 	}

 	/* vApplicationExceptionRegisterDump() is a callback function that the
 	application can optionally define to receive the populated xPortRegisterDump
 	structure.  If the application chooses not to define a version of
 	vApplicationExceptionRegisterDump() then the weekly defined default
 	implementation within this file will be called instead. */
 	vApplicationExceptionRegisterDump( &xRegisterDump );

 	/* Must not attempt to leave this function! */
 	for( ;; )
 	{
 		portNOP();
 	}
 }
 /*-----------------------------------------------------------*/

 void vPortExceptionsInstallHandlers( void )
 {
 static unsigned long ulHandlersAlreadyInstalled = pdFALSE;

 	if( ulHandlersAlreadyInstalled == pdFALSE )
 	{
 		ulHandlersAlreadyInstalled = pdTRUE;

 		#if XPAR_MICROBLAZE_0_UNALIGNED_EXCEPTIONS == 1
 			microblaze_register_exception_handler( XEXC_ID_UNALIGNED_ACCESS, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_UNALIGNED_ACCESS );
 		#endif /* XPAR_MICROBLAZE_0_UNALIGNED_EXCEPTIONS*/

 		#if XPAR_MICROBLAZE_0_ILL_OPCODE_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_ILLEGAL_OPCODE, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_ILLEGAL_OPCODE );
 		#endif /* XPAR_MICROBLAZE_0_ILL_OPCODE_EXCEPTION*/

 		#if XPAR_MICROBLAZE_0_M_AXI_I_BUS_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_M_AXI_I_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_M_AXI_I_EXCEPTION );
 		#endif /* XPAR_MICROBLAZE_0_M_AXI_I_BUS_EXCEPTION*/

 		#if XPAR_MICROBLAZE_0_M_AXI_D_BUS_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_M_AXI_D_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_M_AXI_D_EXCEPTION );
 		#endif /* XPAR_MICROBLAZE_0_M_AXI_D_BUS_EXCEPTION*/

 		#if XPAR_MICROBLAZE_0_IPLB_BUS_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_IPLB_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_IPLB_EXCEPTION );
 		#endif /* XPAR_MICROBLAZE_0_IPLB_BUS_EXCEPTION*/

 		#if XPAR_MICROBLAZE_0_DPLB_BUS_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_DPLB_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_DPLB_EXCEPTION );
 		#endif /* XPAR_MICROBLAZE_0_DPLB_BUS_EXCEPTION*/

 		#if XPAR_MICROBLAZE_0_DIV_ZERO_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_DIV_BY_ZERO, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_DIV_BY_ZERO );
 		#endif /* XPAR_MICROBLAZE_0_DIV_ZERO_EXCEPTION*/

 		#if XPAR_MICROBLAZE_0_FPU_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_FPU, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_FPU );
 		#endif /* XPAR_MICROBLAZE_0_FPU_EXCEPTION*/

 		#if XPAR_MICROBLAZE_0_FSL_EXCEPTION == 1
 			microblaze_register_exception_handler( XEXC_ID_FSL, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_FSL );
 		#endif /* XPAR_MICROBLAZE_0_FSL_EXCEPTION*/
 	}
 }

 /* Exclude the entire file if the MicroBlaze is not configured to handle
 exceptions, or the application defined configuration item
 configINSTALL_EXCEPTION_HANDLERS is not set to 1. */
 #endif /* ( MICROBLAZE_EXCEPTIONS_ENABLED == 1 ) && ( configINSTALL_EXCEPTION_HANDLERS == 1 ) */
	/*
	FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.

	VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

	***************************************************************************
	* *
	* FreeRTOS provides completely free yet professionally developed, *
	* robust, strictly quality controlled, supported, and cross *
	* platform software that has become a de facto standard. *
	* *
	* Help yourself get started quickly and support the FreeRTOS *
	* project by purchasing a FreeRTOS tutorial book, reference *
	* manual, or both from: http://www.FreeRTOS.org/Documentation *
	* *
	* Thank you! *
	* *
	***************************************************************************

	This file is part of the FreeRTOS distribution.

	FreeRTOS is free software; you can redistribute it and/or modify it under
	the terms of the GNU General Public License (version 2) as published by the
	Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.

	>>! NOTE: The modification to the GPL is included to allow you to distribute
	>>! a combined work that includes FreeRTOS without being obliged to provide
	>>! the source code for proprietary components outside of the FreeRTOS
	>>! kernel.

	FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
	FOR A PARTICULAR PURPOSE. Full license text is available from the following
	link: http://www.freertos.org/a00114.html

	1 tab == 4 spaces!

	***************************************************************************
	* *
	* Having a problem? Start by reading the FAQ "My application does *
	* not run, what could be wrong?" *
	* *
	* http://www.FreeRTOS.org/FAQHelp.html *
	* *
	***************************************************************************

	http://www.FreeRTOS.org - Documentation, books, training, latest versions,
	license and Real Time Engineers Ltd. contact details.

	http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
	including FreeRTOS+Trace - an indispensable productivity tool, a DOS
	compatible FAT file system, and our tiny thread aware UDP/IP stack.

	http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
	Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
	licenses offer ticketed support, indemnification and middleware.

	http://www.SafeRTOS.com - High Integrity Systems also provide a safety
	engineered and independently SIL3 certified version for use in safety and
	mission critical applications that require provable dependability.

	1 tab == 4 spaces!
	*/

	/* Scheduler includes. */
	#include "FreeRTOS.h"
	#include "task.h"

	/* Hardware includes. */
	#include <microblaze_exceptions_i.h>
	#include <microblaze_exceptions_g.h>

	/* The Xilinx library defined exception entry point stacks a number of
	registers. These definitions are offsets from the stack pointer to the various
	stacked register values. */
	#define portexR3_STACK_OFFSET 4
	#define portexR4_STACK_OFFSET 5
	#define portexR5_STACK_OFFSET 6
	#define portexR6_STACK_OFFSET 7
	#define portexR7_STACK_OFFSET 8
	#define portexR8_STACK_OFFSET 9
	#define portexR9_STACK_OFFSET 10
	#define portexR10_STACK_OFFSET 11
	#define portexR11_STACK_OFFSET 12
	#define portexR12_STACK_OFFSET 13
	#define portexR15_STACK_OFFSET 16
	#define portexR18_STACK_OFFSET 19
	#define portexMSR_STACK_OFFSET 20
	#define portexR19_STACK_OFFSET -1

	/* This is defined to equal the size, in bytes, of the stack frame generated by
	the Xilinx standard library exception entry point. It is required to determine
	the stack pointer value prior to the exception being entered. */
	#define portexASM_HANDLER_STACK_FRAME_SIZE 84UL

	/* The number of bytes a MicroBlaze instruction consumes. */
	#define portexINSTRUCTION_SIZE 4

	/* Exclude this entire file if the MicroBlaze is not configured to handle
	exceptions, or the application defined configuration constant
	configINSTALL_EXCEPTION_HANDLERS is not set to 1. */
	#if ( MICROBLAZE_EXCEPTIONS_ENABLED == 1 ) && ( configINSTALL_EXCEPTION_HANDLERS == 1 )

	/* This variable is set in the exception entry code, before
	vPortExceptionHandler is called. */
	unsigned long *pulStackPointerOnFunctionEntry = NULL;

	/* This is the structure that is filled with the MicroBlaze context as it
	existed immediately prior to the exception occurrence. A pointer to this
	structure is passed into the vApplicationExceptionRegisterDump() callback
	function, if one is defined. */
	static xPortRegisterDump xRegisterDump;

	/* This is the FreeRTOS exception handler that is installed for all exception
	types. It is called from vPortExceptionHanlderEntry() - which is itself defined
	in portasm.S. */
	void vPortExceptionHandler( void *pvExceptionID );
	extern void vPortExceptionHandlerEntry( void *pvExceptionID );

	/-----------------------------------------------------------/

	/* vApplicationExceptionRegisterDump() is a callback function that the
	application can optionally define to receive a populated xPortRegisterDump
	structure. If the application chooses not to define a version of
	vApplicationExceptionRegisterDump() then this weekly defined default
	implementation will be called instead. */
	extern void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump ) __attribute__((weak));
	void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump )
	{
	( void ) xRegisterDump;

	for( ;; )
	{
	portNOP();
	}
	}
	/-----------------------------------------------------------/

	void vPortExceptionHandler( void *pvExceptionID )
	{
	extern void *pxCurrentTCB;

	/* Fill an xPortRegisterDump structure with the MicroBlaze context as it
	was immediately before the exception occurrence. */

	/* First fill in the name and handle of the task that was in the Running
	state when the exception occurred. */
	xRegisterDump.xCurrentTaskHandle = pxCurrentTCB;
	xRegisterDump.pcCurrentTaskName = pcTaskGetTaskName( NULL );

	configASSERT( pulStackPointerOnFunctionEntry );

	/* Obtain the values of registers that were stacked prior to this function
	being called, and may have changed since they were stacked. */
	xRegisterDump.ulR3 = pulStackPointerOnFunctionEntry[ portexR3_STACK_OFFSET ];
	xRegisterDump.ulR4 = pulStackPointerOnFunctionEntry[ portexR4_STACK_OFFSET ];
	xRegisterDump.ulR5 = pulStackPointerOnFunctionEntry[ portexR5_STACK_OFFSET ];
	xRegisterDump.ulR6 = pulStackPointerOnFunctionEntry[ portexR6_STACK_OFFSET ];
	xRegisterDump.ulR7 = pulStackPointerOnFunctionEntry[ portexR7_STACK_OFFSET ];
	xRegisterDump.ulR8 = pulStackPointerOnFunctionEntry[ portexR8_STACK_OFFSET ];
	xRegisterDump.ulR9 = pulStackPointerOnFunctionEntry[ portexR9_STACK_OFFSET ];
	xRegisterDump.ulR10 = pulStackPointerOnFunctionEntry[ portexR10_STACK_OFFSET ];
	xRegisterDump.ulR11 = pulStackPointerOnFunctionEntry[ portexR11_STACK_OFFSET ];
	xRegisterDump.ulR12 = pulStackPointerOnFunctionEntry[ portexR12_STACK_OFFSET ];
	xRegisterDump.ulR15_return_address_from_subroutine = pulStackPointerOnFunctionEntry[ portexR15_STACK_OFFSET ];
	xRegisterDump.ulR18 = pulStackPointerOnFunctionEntry[ portexR18_STACK_OFFSET ];
	xRegisterDump.ulR19 = pulStackPointerOnFunctionEntry[ portexR19_STACK_OFFSET ];
	xRegisterDump.ulMSR = pulStackPointerOnFunctionEntry[ portexMSR_STACK_OFFSET ];

	/* Obtain the value of all other registers. */
	xRegisterDump.ulR2_small_data_area = mfgpr( R2 );
	xRegisterDump.ulR13_read_write_small_data_area = mfgpr( R13 );
	xRegisterDump.ulR14_return_address_from_interrupt = mfgpr( R14 );
	xRegisterDump.ulR16_return_address_from_trap = mfgpr( R16 );
	xRegisterDump.ulR17_return_address_from_exceptions = mfgpr( R17 );
	xRegisterDump.ulR20 = mfgpr( R20 );
	xRegisterDump.ulR21 = mfgpr( R21 );
	xRegisterDump.ulR22 = mfgpr( R22 );
	xRegisterDump.ulR23 = mfgpr( R23 );
	xRegisterDump.ulR24 = mfgpr( R24 );
	xRegisterDump.ulR25 = mfgpr( R25 );
	xRegisterDump.ulR26 = mfgpr( R26 );
	xRegisterDump.ulR27 = mfgpr( R27 );
	xRegisterDump.ulR28 = mfgpr( R28 );
	xRegisterDump.ulR29 = mfgpr( R29 );
	xRegisterDump.ulR30 = mfgpr( R30 );
	xRegisterDump.ulR31 = mfgpr( R31 );
	xRegisterDump.ulR1_SP = ( ( unsigned long ) pulStackPointerOnFunctionEntry ) + portexASM_HANDLER_STACK_FRAME_SIZE;
	xRegisterDump.ulEAR = mfear();
	xRegisterDump.ulESR = mfesr();
	xRegisterDump.ulEDR = mfedr();

	/* Move the saved program counter back to the instruction that was executed
	when the exception occurred. This is only valid for certain types of
	exception. */
	xRegisterDump.ulPC = xRegisterDump.ulR17_return_address_from_exceptions - portexINSTRUCTION_SIZE;

	#if XPAR_MICROBLAZE_0_USE_FPU == 1
	{
	xRegisterDump.ulFSR = mffsr();
	}
	#else
	{
	xRegisterDump.ulFSR = 0UL;
	}
	#endif

	/* Also fill in a string that describes what type of exception this is.
	The string uses the same ID names as defined in the MicroBlaze standard
	library exception header files. */
	switch( ( unsigned long ) pvExceptionID )
	{
	case XEXC_ID_FSL :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_FSL";
	break;

	case XEXC_ID_UNALIGNED_ACCESS :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_UNALIGNED_ACCESS";
	break;

	case XEXC_ID_ILLEGAL_OPCODE :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_ILLEGAL_OPCODE";
	break;

	case XEXC_ID_M_AXI_I_EXCEPTION :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_M_AXI_I_EXCEPTION or XEXC_ID_IPLB_EXCEPTION";
	break;

	case XEXC_ID_M_AXI_D_EXCEPTION :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_M_AXI_D_EXCEPTION or XEXC_ID_DPLB_EXCEPTION";
	break;

	case XEXC_ID_DIV_BY_ZERO :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_DIV_BY_ZERO";
	break;

	case XEXC_ID_STACK_VIOLATION :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_STACK_VIOLATION or XEXC_ID_MMU";
	break;

	#if XPAR_MICROBLAZE_0_USE_FPU == 1

	case XEXC_ID_FPU :
	xRegisterDump.pcExceptionCause = ( signed char * const ) "XEXC_ID_FPU see ulFSR value";
	break;

	#endif /* XPAR_MICROBLAZE_0_USE_FPU */
	}

	/* vApplicationExceptionRegisterDump() is a callback function that the
	application can optionally define to receive the populated xPortRegisterDump
	structure. If the application chooses not to define a version of
	vApplicationExceptionRegisterDump() then the weekly defined default
	implementation within this file will be called instead. */
	vApplicationExceptionRegisterDump( &xRegisterDump );

	/* Must not attempt to leave this function! */
	for( ;; )
	{
	portNOP();
	}
	}
	/-----------------------------------------------------------/

	void vPortExceptionsInstallHandlers( void )
	{
	static unsigned long ulHandlersAlreadyInstalled = pdFALSE;

	if( ulHandlersAlreadyInstalled == pdFALSE )
	{
	ulHandlersAlreadyInstalled = pdTRUE;

	#if XPAR_MICROBLAZE_0_UNALIGNED_EXCEPTIONS == 1
	microblaze_register_exception_handler( XEXC_ID_UNALIGNED_ACCESS, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_UNALIGNED_ACCESS );
	#endif /* XPAR_MICROBLAZE_0_UNALIGNED_EXCEPTIONS*/

	#if XPAR_MICROBLAZE_0_ILL_OPCODE_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_ILLEGAL_OPCODE, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_ILLEGAL_OPCODE );
	#endif /* XPAR_MICROBLAZE_0_ILL_OPCODE_EXCEPTION*/

	#if XPAR_MICROBLAZE_0_M_AXI_I_BUS_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_M_AXI_I_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_M_AXI_I_EXCEPTION );
	#endif /* XPAR_MICROBLAZE_0_M_AXI_I_BUS_EXCEPTION*/

	#if XPAR_MICROBLAZE_0_M_AXI_D_BUS_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_M_AXI_D_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_M_AXI_D_EXCEPTION );
	#endif /* XPAR_MICROBLAZE_0_M_AXI_D_BUS_EXCEPTION*/

	#if XPAR_MICROBLAZE_0_IPLB_BUS_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_IPLB_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_IPLB_EXCEPTION );
	#endif /* XPAR_MICROBLAZE_0_IPLB_BUS_EXCEPTION*/

	#if XPAR_MICROBLAZE_0_DPLB_BUS_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_DPLB_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_DPLB_EXCEPTION );
	#endif /* XPAR_MICROBLAZE_0_DPLB_BUS_EXCEPTION*/

	#if XPAR_MICROBLAZE_0_DIV_ZERO_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_DIV_BY_ZERO, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_DIV_BY_ZERO );
	#endif /* XPAR_MICROBLAZE_0_DIV_ZERO_EXCEPTION*/

	#if XPAR_MICROBLAZE_0_FPU_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_FPU, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_FPU );
	#endif /* XPAR_MICROBLAZE_0_FPU_EXCEPTION*/

	#if XPAR_MICROBLAZE_0_FSL_EXCEPTION == 1
	microblaze_register_exception_handler( XEXC_ID_FSL, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_FSL );
	#endif /* XPAR_MICROBLAZE_0_FSL_EXCEPTION*/
	}
	}

	/* Exclude the entire file if the MicroBlaze is not configured to handle
	exceptions, or the application defined configuration item
	configINSTALL_EXCEPTION_HANDLERS is not set to 1. */
	#endif /* ( MICROBLAZE_EXCEPTIONS_ENABLED == 1 ) && ( configINSTALL_EXCEPTION_HANDLERS == 1 ) */