FreeRTOS Tetris
StackMacros.h
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69 
70 #ifndef STACK_MACROS_H
71 #define STACK_MACROS_H
72 
73 /*
74  * Call the stack overflow hook function if the stack of the task being swapped
75  * out is currently overflowed, or looks like it might have overflowed in the
76  * past.
77  *
78  * Setting configCHECK_FOR_STACK_OVERFLOW to 1 will cause the macro to check
79  * the current stack state only - comparing the current top of stack value to
80  * the stack limit. Setting configCHECK_FOR_STACK_OVERFLOW to greater than 1
81  * will also cause the last few stack bytes to be checked to ensure the value
82  * to which the bytes were set when the task was created have not been
83  * overwritten. Note this second test does not guarantee that an overflowed
84  * stack will always be recognised.
85  */
86 
87 /*-----------------------------------------------------------*/
88 
89 #if( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH < 0 ) )
90 
91 /* Only the current stack state is to be checked. */
92 #define taskCHECK_FOR_STACK_OVERFLOW() \
93  { \
94  /* Is the currently saved stack pointer within the stack limit? */ \
95  if( pxCurrentTCB->pxTopOfStack <= pxCurrentTCB->pxStack ) \
96  { \
97  vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
98  } \
99  }
100 
101 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
102 /*-----------------------------------------------------------*/
103 
104 #if( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH > 0 ) )
105 
106 /* Only the current stack state is to be checked. */
107 #define taskCHECK_FOR_STACK_OVERFLOW() \
108  { \
109  \
110  /* Is the currently saved stack pointer within the stack limit? */ \
111  if( pxCurrentTCB->pxTopOfStack >= pxCurrentTCB->pxEndOfStack ) \
112  { \
113  vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
114  } \
115  }
116 
117 #endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
118 /*-----------------------------------------------------------*/
119 
120 #if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH < 0 ) )
121 
122 #define taskCHECK_FOR_STACK_OVERFLOW() \
123  { \
124  const uint32_t * const pulStack = ( uint32_t * ) pxCurrentTCB->pxStack; \
125  const uint32_t ulCheckValue = ( uint32_t ) 0xa5a5a5a5; \
126  \
127  if( ( pulStack[ 0 ] != ulCheckValue ) || \
128  ( pulStack[ 1 ] != ulCheckValue ) || \
129  ( pulStack[ 2 ] != ulCheckValue ) || \
130  ( pulStack[ 3 ] != ulCheckValue ) ) \
131  { \
132  vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
133  } \
134  }
135 
136 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
137 /*-----------------------------------------------------------*/
138 
139 #if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH > 0 ) )
140 
141 #define taskCHECK_FOR_STACK_OVERFLOW() \
142  { \
143  int8_t *pcEndOfStack = ( int8_t * ) pxCurrentTCB->pxEndOfStack; \
144  static const uint8_t ucExpectedStackBytes[] = { tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
145  tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
146  tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
147  tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, \
148  tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE }; \
149  \
150  \
151  pcEndOfStack -= sizeof( ucExpectedStackBytes ); \
152  \
153  /* Has the extremity of the task stack ever been written over? */ \
154  if( memcmp( ( void * ) pcEndOfStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 ) \
155  { \
156  vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
157  } \
158  }
159 
160 #endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
161 /*-----------------------------------------------------------*/
162 
163 /* Remove stack overflow macro if not being used. */
164 #ifndef taskCHECK_FOR_STACK_OVERFLOW
165 #define taskCHECK_FOR_STACK_OVERFLOW()
166 #endif
167 
168 
169 
170 #endif /* STACK_MACROS_H */
171 
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