begriffs open source - freertos/blob - include/stack_macros.h

   1 /*\r
   2  * FreeRTOS Kernel <DEVELOPMENT BRANCH>\r
   3  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.\r
   4  *\r
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy of\r
   6  * this software and associated documentation files (the "Software"), to deal in\r
   7  * the Software without restriction, including without limitation the rights to\r
   8  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of\r
   9  * the Software, and to permit persons to whom the Software is furnished to do so,\r
  10  * subject to the following conditions:\r
  11  *\r
  12  * The above copyright notice and this permission notice shall be included in all\r
  13  * copies or substantial portions of the Software.\r
  14  *\r
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\r
  17  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\r
  18  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r
  19  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r
  20  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
  21  *\r
  22  * https://www.FreeRTOS.org\r
  23  * https://github.com/FreeRTOS\r
  24  *\r
  25  */\r
  26 \r
  27 #ifndef STACK_MACROS_H\r
  28 #define STACK_MACROS_H\r
  29 \r
  30 /*\r
  31  * Call the stack overflow hook function if the stack of the task being swapped\r
  32  * out is currently overflowed, or looks like it might have overflowed in the\r
  33  * past.\r
  34  *\r
  35  * Setting configCHECK_FOR_STACK_OVERFLOW to 1 will cause the macro to check\r
  36  * the current stack state only - comparing the current top of stack value to\r
  37  * the stack limit.  Setting configCHECK_FOR_STACK_OVERFLOW to greater than 1\r
  38  * will also cause the last few stack bytes to be checked to ensure the value\r
  39  * to which the bytes were set when the task was created have not been\r
  40  * overwritten.  Note this second test does not guarantee that an overflowed\r
  41  * stack will always be recognised.\r
  42  */\r
  43 \r
  44 /*-----------------------------------------------------------*/\r
  45 \r
  46 #if ( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH < 0 ) )\r
  47 \r
  48 /* Only the current stack state is to be checked. */\r
  49     #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \\r
  50     {                                                                                                 \\r
  51         /* Is the currently saved stack pointer within the stack limit? */                            \\r
  52         if( pxCurrentTCB->pxTopOfStack <= pxCurrentTCB->pxStack )                                     \\r
  53         {                                                                                             \\r
  54             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \\r
  55         }                                                                                             \\r
  56     }\r
  57 \r
  58 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */\r
  59 /*-----------------------------------------------------------*/\r
  60 \r
  61 #if ( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH > 0 ) )\r
  62 \r
  63 /* Only the current stack state is to be checked. */\r
  64     #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \\r
  65     {                                                                                                 \\r
  66                                                                                                       \\r
  67         /* Is the currently saved stack pointer within the stack limit? */                            \\r
  68         if( pxCurrentTCB->pxTopOfStack >= pxCurrentTCB->pxEndOfStack )                                \\r
  69         {                                                                                             \\r
  70             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \\r
  71         }                                                                                             \\r
  72     }\r
  73 \r
  74 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */\r
  75 /*-----------------------------------------------------------*/\r
  76 \r
  77 #if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH < 0 ) )\r
  78 \r
  79     #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \\r
  80     {                                                                                                 \\r
  81         const uint32_t * const pulStack = ( uint32_t * ) pxCurrentTCB->pxStack;                       \\r
  82         const uint32_t ulCheckValue = ( uint32_t ) 0xa5a5a5a5;                                        \\r
  83                                                                                                       \\r
  84         if( ( pulStack[ 0 ] != ulCheckValue ) ||                                                      \\r
  85             ( pulStack[ 1 ] != ulCheckValue ) ||                                                      \\r
  86             ( pulStack[ 2 ] != ulCheckValue ) ||                                                      \\r
  87             ( pulStack[ 3 ] != ulCheckValue ) )                                                       \\r
  88         {                                                                                             \\r
  89             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \\r
  90         }                                                                                             \\r
  91     }\r
  92 \r
  93 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */\r
  94 /*-----------------------------------------------------------*/\r
  95 \r
  96 #if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH > 0 ) )\r
  97 \r
  98     #define taskCHECK_FOR_STACK_OVERFLOW()                                                                                                \\r
  99     {                                                                                                                                     \\r
 100         int8_t * pcEndOfStack = ( int8_t * ) pxCurrentTCB->pxEndOfStack;                                                                  \\r
 101         static const uint8_t ucExpectedStackBytes[] = { tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \\r
 102                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \\r
 103                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \\r
 104                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \\r
 105                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE }; \\r
 106                                                                                                                                           \\r
 107                                                                                                                                           \\r
 108         pcEndOfStack -= sizeof( ucExpectedStackBytes );                                                                                   \\r
 109                                                                                                                                           \\r
 110         /* Has the extremity of the task stack ever been written over? */                                                                 \\r
 111         if( memcmp( ( void * ) pcEndOfStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 )                     \\r
 112         {                                                                                                                                 \\r
 113             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName );                                     \\r
 114         }                                                                                                                                 \\r
 115     }\r
 116 \r
 117 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */\r
 118 /*-----------------------------------------------------------*/\r
 119 \r
 120 /* Remove stack overflow macro if not being used. */\r
 121 #ifndef taskCHECK_FOR_STACK_OVERFLOW\r
 122     #define taskCHECK_FOR_STACK_OVERFLOW()\r
 123 #endif\r
 124 \r
 125 \r
 126 \r
 127 #endif /* STACK_MACROS_H */\r