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+/*
+ * 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"
+
+/*
+ * Our stub for pvPortMalloc in cbmc.h nondeterministically chooses
+ * either to return NULL or to allocate the requested memory.
+ */
+void vNondetSetCurrentTCB( void )
+{
+ pxCurrentTCB = pvPortMalloc( sizeof(TCB_t) );
+}
+/*
+ * We just require task lists to be initialized for this proof
+ */
+void vPrepareTaskLists( void )
+{
+ __CPROVER_assert_zero_allocation();
+
+ prvInitialiseTaskLists();
+}
+
+/*
+ * We set the values of relevant global
+ * variables to nondeterministic values
+ */
+void vSetGlobalVariables( void )
+{
+ xSchedulerRunning = nondet_basetype();
+ uxCurrentNumberOfTasks = nondet_ubasetype();
+}
+
+/*
+ * pvPortMalloc is nondeterministic by definition, thus we do not need
+ * to check for NULL allocation in this function
+ */
+TaskHandle_t *pxNondetSetTaskHandle( void )
+{
+ TaskHandle_t *pxNondetTaskHandle = pvPortMalloc( sizeof(TaskHandle_t) );
+ return pxNondetTaskHandle;
+}
+
+/*
+ * Tries to allocate a string of size xStringLength and sets the string
+ * to be terminated using a nondeterministic index if allocation was successful
+ */
+char *pcNondetSetString( size_t xStringLength )
+{
+ char *pcName = pvPortMalloc( xStringLength );
+
+ if ( pcName != NULL ) {
+ size_t uNondetIndex;
+ __CPROVER_assume( uNondetIndex < xStringLength );
+ pcName[uNondetIndex] = '\0';
+ }
+
+ return pcName;
+}