/*
    FreeRTOS V9.0.0rc2 - Copyright (C) 2016 Real Time Engineers Ltd.
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    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 on the following
    link: http://www.freertos.org/a00114.html

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
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    ***************************************************************************

    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
    the FAQ page "My application does not run, what could be wrong?".  Have you
    defined configASSERT()?

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    1 tab == 4 spaces!
*/

#ifndef STACK_MACROS_H
#define STACK_MACROS_H

/*
 * Call the stack overflow hook function if the stack of the task being swapped
 * out is currently overflowed, or looks like it might have overflowed in the
 * past.
 *
 * Setting configCHECK_FOR_STACK_OVERFLOW to 1 will cause the macro to check
 * the current stack state only - comparing the current top of stack value to
 * the stack limit.  Setting configCHECK_FOR_STACK_OVERFLOW to greater than 1
 * will also cause the last few stack bytes to be checked to ensure the value
 * to which the bytes were set when the task was created have not been
 * overwritten.  Note this second test does not guarantee that an overflowed
 * stack will always be recognised.
 */

/*-----------------------------------------------------------*/

#if( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH < 0 ) )

	/* Only the current stack state is to be checked. */
	#define taskCHECK_FOR_STACK_OVERFLOW()																\
	{																									\
		/* Is the currently saved stack pointer within the stack limit? */								\
		if( pxCurrentTCB->pxTopOfStack <= pxCurrentTCB->pxStack )										\
		{																								\
			vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName );	\
		}																								\
	}

#endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
/*-----------------------------------------------------------*/

#if( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH > 0 ) )

	/* Only the current stack state is to be checked. */
	#define taskCHECK_FOR_STACK_OVERFLOW()																\
	{																									\
																										\
		/* Is the currently saved stack pointer within the stack limit? */								\
		if( pxCurrentTCB->pxTopOfStack >= pxCurrentTCB->pxEndOfStack )									\
		{																								\
			vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName );	\
		}																								\
	}

#endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
/*-----------------------------------------------------------*/

#if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH < 0 ) )

	#define taskCHECK_FOR_STACK_OVERFLOW()																\
	{																									\
		const uint32_t * const pulStack = ( uint32_t * ) pxCurrentTCB->pxStack;							\
		const uint32_t ulCheckValue = ( uint32_t ) 0xa5a5a5a5;											\
																										\
		if( ( pulStack[ 0 ] != ulCheckValue ) ||												\
			( pulStack[ 1 ] != ulCheckValue ) ||												\
			( pulStack[ 2 ] != ulCheckValue ) ||												\
			( pulStack[ 3 ] != ulCheckValue ) )												\
		{																								\
			vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName );	\
		}																								\
	}

#endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
/*-----------------------------------------------------------*/

#if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH > 0 ) )

	#define taskCHECK_FOR_STACK_OVERFLOW()																								\
	{																																	\
	int8_t *pcEndOfStack = ( int8_t * ) pxCurrentTCB->pxEndOfStack;																		\
	static const uint8_t ucExpectedStackBytes[] = {	tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,		\
													tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,		\
													tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,		\
													tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,		\
													tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE };	\
																																		\
																																		\
		pcEndOfStack -= sizeof( ucExpectedStackBytes );																					\
																																		\
		/* Has the extremity of the task stack ever been written over? */																\
		if( memcmp( ( void * ) pcEndOfStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 )					\
		{																																\
			vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName );									\
		}																																\
	}

#endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
/*-----------------------------------------------------------*/

/* Remove stack overflow macro if not being used. */
#ifndef taskCHECK_FOR_STACK_OVERFLOW
	#define taskCHECK_FOR_STACK_OVERFLOW()
#endif



#endif /* STACK_MACROS_H */