1 files changed, 103 insertions, 0 deletions
diff --git a/FreeRTOS/Test/CBMC/proofs/Task/TaskSwitchContext/tasks_test_access_functions.h b/FreeRTOS/Test/CBMC/proofs/Task/TaskSwitchContext/tasks_test_access_functions.h
new file mode 100644
index 000000000..2b5ebff7f
--- /dev/null
+++ b/FreeRTOS/Test/CBMC/proofs/Task/TaskSwitchContext/tasks_test_access_functions.h
@@ -0,0 +1,103 @@
+/*
+ * FreeRTOS memory safety proofs with CBMC.
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+#include "cbmc.h"
+
+/*
+ * We allocate a TCB and set some members to basic values
+ */
+TaskHandle_t xUnconstrainedTCB( UBaseType_t uxPriority )
+{
+	TCB_t * pxTCB = pvPortMalloc(sizeof(TCB_t));
+
+	if ( pxTCB == NULL )
+		return NULL;
+
+	/* uxPriority is set to a specific priority */
+	pxTCB->uxPriority = uxPriority;
+
+	vListInitialiseItem( &( pxTCB->xStateListItem ) );
+	vListInitialiseItem( &( pxTCB->xEventListItem ) );
+
+	listSET_LIST_ITEM_OWNER( &( pxTCB->xStateListItem ), pxTCB );
+	listSET_LIST_ITEM_OWNER( &( pxTCB->xEventListItem ), pxTCB );
+
+	if ( nondet_bool() )
+	{
+		listSET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ), pxTCB->uxPriority );
+	}
+	else
+	{
+		listSET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ), portMAX_DELAY );
+	}
+
+	if ( nondet_bool() )
+	{
+		listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxTCB->uxPriority );
+	}
+	else
+	{
+		listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), portMAX_DELAY );
+	}
+	return pxTCB;
+}
+
+/*
+ * We set the values of relevant global
+ * variables to nondeterministic values
+ */
+void vSetGlobalVariables( void )
+{
+	uxSchedulerSuspended = nondet_ubasetype();
+}
+
+/*
+ * We initialize and fill with one item each ready tasks list
+ * so that the assertion on line 175 (tasks.c) does not fail
+ */
+BaseType_t xPrepareTaskLists( void )
+{
+	TCB_t * pxTCB = NULL;
+
+	__CPROVER_assert_zero_allocation();
+
+	prvInitialiseTaskLists();
+
+	for ( int i = 0; i < configMAX_PRIORITIES; ++i )
+	{
+		pxTCB = xUnconstrainedTCB( i );
+		if ( pxTCB == NULL )
+		{
+			return pdFAIL;
+		}
+		vListInsert( &pxReadyTasksLists[ pxTCB->uxPriority ], &( pxTCB->xStateListItem ) );
+	}
+	listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &pxReadyTasksLists[ configMAX_PRIORITIES - 1 ] );
+
+	return pdPASS;
+}