begriffs open source - freertos/blob - FreeRTOS/Source/include/StackMacros.h

   1 /*\r
   2     FreeRTOS V7.3.0 - Copyright (C) 2012 Real Time Engineers Ltd.\r
   3 \r
   4     FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT \r
   5     http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     ***************************************************************************\r
   8      *                                                                       *\r
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  10      *    Complete, revised, and edited pdf reference manuals are also       *\r
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  12      *                                                                       *\r
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  15      *    in-depth knowledge of how to use FreeRTOS, it will also help       *\r
  16      *    the FreeRTOS project to continue with its mission of providing     *\r
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  19      *                                                                       *\r
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  21      *                                                                       *\r
  22      *    Thank you for using FreeRTOS, and thank you for your support!      *\r
  23      *                                                                       *\r
  24     ***************************************************************************\r
  25 \r
  26 \r
  27     This file is part of the FreeRTOS distribution.\r
  28 \r
  29     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  30     the terms of the GNU General Public License (version 2) as published by the\r
  31     Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
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  33     distribute a combined work that includes FreeRTOS without being obliged to\r
  34     provide the source code for proprietary components outside of the FreeRTOS\r
  35     kernel.  FreeRTOS is distributed in the hope that it will be useful, but\r
  36     WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\r
  37     or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for\r
  38     more details. You should have received a copy of the GNU General Public\r
  39     License and the FreeRTOS license exception along with FreeRTOS; if not it\r
  40     can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
  41     by writing to Richard Barry, contact details for whom are available on the\r
  42     FreeRTOS WEB site.\r
  43 \r
  44     1 tab == 4 spaces!\r
  45     \r
  46     ***************************************************************************\r
  47      *                                                                       *\r
  48      *    Having a problem?  Start by reading the FAQ "My application does   *\r
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  51      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  52      *                                                                       *\r
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  54 \r
  55     \r
  56     http://www.FreeRTOS.org - Documentation, training, latest versions, license \r
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  62     Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell \r
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  66     the SafeRTOS brand: http://www.SafeRTOS.com.\r
  67 */\r
  68 \r
  69 #ifndef STACK_MACROS_H\r
  70 #define STACK_MACROS_H\r
  71 \r
  72 /*\r
  73  * Call the stack overflow hook function if the stack of the task being swapped\r
  74  * out is currently overflowed, or looks like it might have overflowed in the\r
  75  * past.\r
  76  *\r
  77  * Setting configCHECK_FOR_STACK_OVERFLOW to 1 will cause the macro to check\r
  78  * the current stack state only - comparing the current top of stack value to\r
  79  * the stack limit.  Setting configCHECK_FOR_STACK_OVERFLOW to greater than 1\r
  80  * will also cause the last few stack bytes to be checked to ensure the value\r
  81  * to which the bytes were set when the task was created have not been\r
  82  * overwritten.  Note this second test does not guarantee that an overflowed\r
  83  * stack will always be recognised.\r
  84  */\r
  85 \r
  86 /*-----------------------------------------------------------*/\r
  87 \r
  88 #if( configCHECK_FOR_STACK_OVERFLOW == 0 )\r
  89 \r
  90         /* FreeRTOSConfig.h is not set to check for stack overflows. */\r
  91         #define taskFIRST_CHECK_FOR_STACK_OVERFLOW()\r
  92         #define taskSECOND_CHECK_FOR_STACK_OVERFLOW()\r
  93 \r
  94 #endif /* configCHECK_FOR_STACK_OVERFLOW == 0 */\r
  95 /*-----------------------------------------------------------*/\r
  96 \r
  97 #if( configCHECK_FOR_STACK_OVERFLOW == 1 )\r
  98 \r
  99         /* FreeRTOSConfig.h is only set to use the first method of\r
 100         overflow checking. */\r
 101         #define taskSECOND_CHECK_FOR_STACK_OVERFLOW()\r
 102 \r
 103 #endif\r
 104 /*-----------------------------------------------------------*/\r
 105 \r
 106 #if( ( configCHECK_FOR_STACK_OVERFLOW > 0 ) && ( portSTACK_GROWTH < 0 ) )\r
 107 \r
 108         /* Only the current stack state is to be checked. */\r
 109         #define taskFIRST_CHECK_FOR_STACK_OVERFLOW()                                                                                                            \\r
 110         {                                                                                                                                                                                                       \\r
 111                 /* Is the currently saved stack pointer within the stack limit? */                                                              \\r
 112                 if( pxCurrentTCB->pxTopOfStack <= pxCurrentTCB->pxStack )                                                                               \\r
 113                 {                                                                                                                                                                                               \\r
 114                         vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName );        \\r
 115                 }                                                                                                                                                                                               \\r
 116         }\r
 117 \r
 118 #endif /* configCHECK_FOR_STACK_OVERFLOW > 0 */\r
 119 /*-----------------------------------------------------------*/\r
 120 \r
 121 #if( ( configCHECK_FOR_STACK_OVERFLOW > 0 ) && ( portSTACK_GROWTH > 0 ) )\r
 122 \r
 123         /* Only the current stack state is to be checked. */\r
 124         #define taskFIRST_CHECK_FOR_STACK_OVERFLOW()                                                                                                            \\r
 125         {                                                                                                                                                                                                       \\r
 126                                                                                                                                                                                                                 \\r
 127                 /* Is the currently saved stack pointer within the stack limit? */                                                              \\r
 128                 if( pxCurrentTCB->pxTopOfStack >= pxCurrentTCB->pxEndOfStack )                                                                  \\r
 129                 {                                                                                                                                                                                               \\r
 130                         vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName );        \\r
 131                 }                                                                                                                                                                                               \\r
 132         }\r
 133 \r
 134 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */\r
 135 /*-----------------------------------------------------------*/\r
 136 \r
 137 #if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH < 0 ) )\r
 138 \r
 139         #define taskSECOND_CHECK_FOR_STACK_OVERFLOW()                                                                                                                                                                                           \\r
 140         {                                                                                                                                                                                                                                                                                       \\r
 141         static const unsigned char ucExpectedStackBytes[] = {   tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 142                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 143                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 144                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 145                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE };       \\r
 146                                                                                                                                                                                                                                                                                                 \\r
 147                                                                                                                                                                                                                                                                                                 \\r
 148                 /* Has the extremity of the task stack ever been written over? */                                                                                                                                               \\r
 149                 if( memcmp( ( void * ) pxCurrentTCB->pxStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 )                                  \\r
 150                 {                                                                                                                                                                                                                                                                               \\r
 151                         vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName );                                                                                        \\r
 152                 }                                                                                                                                                                                                                                                                               \\r
 153         }\r
 154 \r
 155 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */\r
 156 /*-----------------------------------------------------------*/\r
 157 \r
 158 #if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH > 0 ) )\r
 159 \r
 160         #define taskSECOND_CHECK_FOR_STACK_OVERFLOW()                                                                                                                                                                                           \\r
 161         {                                                                                                                                                                                                                                                                                       \\r
 162         char *pcEndOfStack = ( char * ) pxCurrentTCB->pxEndOfStack;                                                                                                                                                                     \\r
 163         static const unsigned char ucExpectedStackBytes[] = {   tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 164                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 165                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 166                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,         \\r
 167                                                                                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE };       \\r
 168                                                                                                                                                                                                                                                                                                 \\r
 169                                                                                                                                                                                                                                                                                                 \\r
 170                 pcEndOfStack -= sizeof( ucExpectedStackBytes );                                                                                                                                                                                 \\r
 171                                                                                                                                                                                                                                                                                                 \\r
 172                 /* Has the extremity of the task stack ever been written over? */                                                                                                                                               \\r
 173                 if( memcmp( ( void * ) pcEndOfStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 )                                                   \\r
 174                 {                                                                                                                                                                                                                                                                               \\r
 175                         vApplicationStackOverflowHook( ( xTaskHandle ) pxCurrentTCB, pxCurrentTCB->pcTaskName );                                                                                        \\r
 176                 }                                                                                                                                                                                                                                                                               \\r
 177         }\r
 178 \r
 179 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */\r
 180 /*-----------------------------------------------------------*/\r
 181 \r
 182 #endif /* STACK_MACROS_H */\r
 183 \r