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

   1 /*
   2  * FreeRTOS Kernel <DEVELOPMENT BRANCH>
   3  * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
   4  *
   5  * SPDX-License-Identifier: MIT
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy of
   8  * this software and associated documentation files (the "Software"), to deal in
   9  * the Software without restriction, including without limitation the rights to
  10  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  11  * the Software, and to permit persons to whom the Software is furnished to do so,
  12  * subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in all
  15  * copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  19  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  20  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  21  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * https://www.FreeRTOS.org
  25  * https://github.com/FreeRTOS
  26  *
  27  */
  28
  29 #ifndef STACK_MACROS_H
  30 #define STACK_MACROS_H
  31
  32 /*
  33  * Call the stack overflow hook function if the stack of the task being swapped
  34  * out is currently overflowed, or looks like it might have overflowed in the
  35  * past.
  36  *
  37  * Setting configCHECK_FOR_STACK_OVERFLOW to 1 will cause the macro to check
  38  * the current stack state only - comparing the current top of stack value to
  39  * the stack limit.  Setting configCHECK_FOR_STACK_OVERFLOW to greater than 1
  40  * will also cause the last few stack bytes to be checked to ensure the value
  41  * to which the bytes were set when the task was created have not been
  42  * overwritten.  Note this second test does not guarantee that an overflowed
  43  * stack will always be recognised.
  44  */
  45
  46 /*-----------------------------------------------------------*/
  47
  48 /*
  49  * portSTACK_LIMIT_PADDING is a number of extra words to consider to be in
  50  * use on the stack.
  51  */
  52 #ifndef portSTACK_LIMIT_PADDING
  53     #define portSTACK_LIMIT_PADDING    0
  54 #endif
  55
  56 #if ( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH < 0 ) )
  57
  58 /* Only the current stack state is to be checked. */
  59     #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \
  60     do {                                                                                              \
  61         /* Is the currently saved stack pointer within the stack limit? */                            \
  62         if( pxCurrentTCB->pxTopOfStack <= pxCurrentTCB->pxStack + portSTACK_LIMIT_PADDING )           \
  63         {                                                                                             \
  64             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
  65         }                                                                                             \
  66     } while( 0 )
  67
  68 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
  69 /*-----------------------------------------------------------*/
  70
  71 #if ( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH > 0 ) )
  72
  73 /* Only the current stack state is to be checked. */
  74     #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \
  75     do {                                                                                              \
  76                                                                                                       \
  77         /* Is the currently saved stack pointer within the stack limit? */                            \
  78         if( pxCurrentTCB->pxTopOfStack >= pxCurrentTCB->pxEndOfStack - portSTACK_LIMIT_PADDING )      \
  79         {                                                                                             \
  80             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
  81         }                                                                                             \
  82     } while( 0 )
  83
  84 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
  85 /*-----------------------------------------------------------*/
  86
  87 #if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH < 0 ) )
  88
  89     #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \
  90     do {                                                                                              \
  91         const uint32_t * const pulStack = ( uint32_t * ) pxCurrentTCB->pxStack;                       \
  92         const uint32_t ulCheckValue = ( uint32_t ) 0xa5a5a5a5;                                        \
  93                                                                                                       \
  94         if( ( pulStack[ 0 ] != ulCheckValue ) ||                                                      \
  95             ( pulStack[ 1 ] != ulCheckValue ) ||                                                      \
  96             ( pulStack[ 2 ] != ulCheckValue ) ||                                                      \
  97             ( pulStack[ 3 ] != ulCheckValue ) )                                                       \
  98         {                                                                                             \
  99             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
 100         }                                                                                             \
 101     } while( 0 )
 102
 103 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
 104 /*-----------------------------------------------------------*/
 105
 106 #if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH > 0 ) )
 107
 108     #define taskCHECK_FOR_STACK_OVERFLOW()                                                                                                \
 109     do {                                                                                                                                  \
 110         int8_t * pcEndOfStack = ( int8_t * ) pxCurrentTCB->pxEndOfStack;                                                                  \
 111         static const uint8_t ucExpectedStackBytes[] = { tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
 112                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
 113                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
 114                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
 115                                                         tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE }; \
 116                                                                                                                                           \
 117                                                                                                                                           \
 118         pcEndOfStack -= sizeof( ucExpectedStackBytes );                                                                                   \
 119                                                                                                                                           \
 120         /* Has the extremity of the task stack ever been written over? */                                                                 \
 121         if( memcmp( ( void * ) pcEndOfStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 )                     \
 122         {                                                                                                                                 \
 123             vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName );                                     \
 124         }                                                                                                                                 \
 125     } while( 0 )
 126
 127 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
 128 /*-----------------------------------------------------------*/
 129
 130 /* Remove stack overflow macro if not being used. */
 131 #ifndef taskCHECK_FOR_STACK_OVERFLOW
 132     #define taskCHECK_FOR_STACK_OVERFLOW()
 133 #endif
 134
 135
 136
 137 #endif /* STACK_MACROS_H */