2 FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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4 ***************************************************************************
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8 * + New to FreeRTOS, *
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9 * + Wanting to learn FreeRTOS or multitasking in general quickly *
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10 * + Looking for basic training, *
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11 * + Wanting to improve your FreeRTOS skills and productivity *
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13 * then take a look at the FreeRTOS books - available as PDF or paperback *
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15 * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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16 * http://www.FreeRTOS.org/Documentation *
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18 * A pdf reference manual is also available. Both are usually delivered *
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19 * to your inbox within 20 minutes to two hours when purchased between 8am *
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20 * and 8pm GMT (although please allow up to 24 hours in case of *
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21 * exceptional circumstances). Thank you for your support! *
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23 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 ***NOTE*** The exception to the GPL is included to allow you to distribute
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31 a combined work that includes FreeRTOS without being obliged to provide the
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32 source code for proprietary components outside of the FreeRTOS kernel.
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33 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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34 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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35 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 http://www.FreeRTOS.org - Documentation, latest information, license and
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47 http://www.SafeRTOS.com - A version that is certified for use in safety
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50 http://www.OpenRTOS.com - Commercial support, development, porting,
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51 licensing and training services.
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54 #ifndef STACK_MACROS_H
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55 #define STACK_MACROS_H
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58 * Call the stack overflow hook function if the stack of the task being swapped
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59 * out is currently overflowed, or looks like it might have overflowed in the
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62 * Setting configCHECK_FOR_STACK_OVERFLOW to 1 will cause the macro to check
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63 * the current stack state only - comparing the current top of stack value to
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64 * the stack limit. Setting configCHECK_FOR_STACK_OVERFLOW to greater than 1
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65 * will also cause the last few stack bytes to be checked to ensure the value
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66 * to which the bytes were set when the task was created have not been
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67 * overwritten. Note this second test does not guarantee that an overflowed
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68 * stack will always be recognised.
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71 /*-----------------------------------------------------------*/
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73 #if( configCHECK_FOR_STACK_OVERFLOW == 0 )
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75 /* FreeRTOSConfig.h is not set to check for stack overflows. */
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76 #define taskFIRST_CHECK_FOR_STACK_OVERFLOW()
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77 #define taskSECOND_CHECK_FOR_STACK_OVERFLOW()
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79 #endif /* configCHECK_FOR_STACK_OVERFLOW == 0 */
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80 /*-----------------------------------------------------------*/
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82 #if( configCHECK_FOR_STACK_OVERFLOW == 1 )
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84 /* FreeRTOSConfig.h is only set to use the first method of
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85 overflow checking. */
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86 #define taskSECOND_CHECK_FOR_STACK_OVERFLOW()
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89 /*-----------------------------------------------------------*/
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91 #if( ( configCHECK_FOR_STACK_OVERFLOW > 0 ) && ( portSTACK_GROWTH < 0 ) )
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93 /* Only the current stack state is to be checked. */
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94 #define taskFIRST_CHECK_FOR_STACK_OVERFLOW() \
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96 extern void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName ); \
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98 /* Is the currently saved stack pointer within the stack limit? */ \
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99 if( pxCurrentTCB->pxTopOfStack <= pxCurrentTCB->pxStack ) \
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101 vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
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105 #endif /* configCHECK_FOR_STACK_OVERFLOW > 0 */
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106 /*-----------------------------------------------------------*/
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108 #if( ( configCHECK_FOR_STACK_OVERFLOW > 0 ) && ( portSTACK_GROWTH > 0 ) )
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110 /* Only the current stack state is to be checked. */
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111 #define taskFIRST_CHECK_FOR_STACK_OVERFLOW() \
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113 extern void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName ); \
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115 /* Is the currently saved stack pointer within the stack limit? */ \
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116 if( pxCurrentTCB->pxTopOfStack >= pxCurrentTCB->pxEndOfStack ) \
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118 vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
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122 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
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123 /*-----------------------------------------------------------*/
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125 #if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH < 0 ) )
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127 #define taskSECOND_CHECK_FOR_STACK_OVERFLOW() \
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129 extern void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName ); \
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130 static const unsigned char ucExpectedStackBytes[] = { tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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131 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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132 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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133 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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134 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE }; \
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137 /* Has the extremity of the task stack ever been written over? */ \
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138 if( memcmp( ( void * ) pxCurrentTCB->pxStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 ) \
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140 vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
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144 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
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145 /*-----------------------------------------------------------*/
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147 #if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH > 0 ) )
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149 #define taskSECOND_CHECK_FOR_STACK_OVERFLOW() \
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151 extern void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName ); \
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152 char *pcEndOfStack = ( char * ) pxCurrentTCB->pxEndOfStack; \
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153 static const unsigned char ucExpectedStackBytes[] = { tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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154 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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155 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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156 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
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157 tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE }; \
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160 pcEndOfStack -= sizeof( ucExpectedStackBytes ); \
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162 /* Has the extremity of the task stack ever been written over? */ \
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163 if( memcmp( ( void * ) pcEndOfStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 ) \
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165 vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
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169 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
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170 /*-----------------------------------------------------------*/
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172 #endif /* STACK_MACROS_H */
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