2 * FreeRTOS memory safety proofs with CBMC.
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32 * We allocate a TCB and set some members to basic values
34 TaskHandle_t xUnconstrainedTCB( void )
36 TCB_t * pxTCB = pvPortMalloc( sizeof( TCB_t ) );
37 uint8_t ucStaticAllocationFlag;
44 __CPROVER_assume( pxTCB->uxPriority < configMAX_PRIORITIES );
46 vListInitialiseItem( &( pxTCB->xStateListItem ) );
47 vListInitialiseItem( &( pxTCB->xEventListItem ) );
49 listSET_LIST_ITEM_OWNER( &( pxTCB->xStateListItem ), pxTCB );
50 listSET_LIST_ITEM_OWNER( &( pxTCB->xEventListItem ), pxTCB );
54 listSET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ), pxTCB->uxPriority );
58 listSET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ), portMAX_DELAY );
63 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxTCB->uxPriority );
67 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), portMAX_DELAY );
74 * We initialise and fill the task lists so coverage is optimal.
75 * This initialization is not guaranteed to be minimal, but it
76 * is quite efficient and it serves the same purpose
78 BaseType_t xPrepareTaskLists( TaskHandle_t * xTask )
82 __CPROVER_assert_zero_allocation();
84 prvInitialiseTaskLists();
86 pxTCB = xUnconstrainedTCB();
88 /* Needed for coverage: nondet insertion of task. */
92 pxOtherTCB = xUnconstrainedTCB();
94 if( pxOtherTCB != NULL )
96 vListInsert( &pxReadyTasksLists[ pxOtherTCB->uxPriority ], &( pxOtherTCB->xStateListItem ) );
102 /* Needed for coverage: nondeterministic insertion of task */
105 vListInsert( &pxReadyTasksLists[ pxTCB->uxPriority ], &( pxTCB->xStateListItem ) );
109 /* Note that `*xTask = NULL` can happen here, but this is fine -- `pxCurrentTCB` will be used instead */
112 pxCurrentTCB = xUnconstrainedTCB();
114 if( pxCurrentTCB == NULL )
119 /* Needed for coverage: nondeterministic insertion of task */
122 vListInsert( &pxReadyTasksLists[ pxCurrentTCB->uxPriority ], &( pxCurrentTCB->xStateListItem ) );
124 /* Needed for coverage. */
125 listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &pxReadyTasksLists[ pxCurrentTCB->uxPriority ] );