[修改] 增加freeRTOS

1. 版本FreeRTOSv202212.01，命名为kernel；

kernel/FreeRTOS/Test/CBMC/proofs/Task/TaskCreate/Makefile.json

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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
+#
+
+{
+  "ENTRY": "TaskCreate",
+  "DEF":
+  [
+    "STACK_DEPTH=10",
+    "FREERTOS_MODULE_TEST",
+    "'mtCOVERAGE_TEST_MARKER()=__CPROVER_assert(1, \"Coverage marker\")'"
+  ],
+  "CBMCFLAGS":
+  [
+      "--unwind 1",
+      "--unwindset prvInitialiseNewTask.0:16,prvInitialiseNewTask.1:4,prvInitialiseTaskLists.0:8"
+  ],
+  "OBJS":
+  [
+    "$(ENTRY)_harness.goto",
+    "$(FREERTOS)/Source/tasks.goto",
+    "$(FREERTOS)/Source/list.goto"
+  ],
+  "INC":
+  [
+    "$(FREERTOS)/Test/CBMC/proofs/Task/TaskCreate/"
+  ]
+}

kernel/FreeRTOS/Test/CBMC/proofs/Task/TaskCreate/README.md

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+This proof demonstrates the memory safety of the TaskCreate function.
+We initialize task lists, but we set other data structures to
+unconstrained (arbitrary) values, including the data structures
+`pxCurrentTCB`, `uxCurrentNumberOfTasks`, `pcName` and `pxCreateTask`.
+STACK_DEPTH is set to a fixed number (10) since it is not possible to
+specify a range.
+
+This proof is a work-in-progress.  Proof assumptions are described in
+the harness.  The proof also assumes the following functions are
+memory safe and have no side effects relevant to the memory safety of
+this function:
+
+* prvTraceGetObjectHandle
+* prvTraceGetTaskNumber
+* prvTraceSetObjectName
+* prvTraceSetPriorityProperty
+* prvTraceStoreKernelCall
+* prvTraceStoreTaskReady
+* pxPortInitialiseStack
+* vPortEnterCritical
+* vPortExitCritical
+* vPortGenerateSimulatedInterrupt

kernel/FreeRTOS/Test/CBMC/proofs/Task/TaskCreate/TaskCreate_harness.c

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+/*
+ * FreeRTOS V202212.01
+ * Copyright (C) 2020 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.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#include <stdint.h>
+
+/* FreeRTOS includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+
+void vNondetSetCurrentTCB( void );
+void vSetGlobalVariables( void );
+void vPrepareTaskLists( void );
+TaskHandle_t * pxNondetSetTaskHandle( void );
+char * pcNondetSetString( size_t xSizeLength );
+
+void harness()
+{
+    TaskFunction_t pxTaskCode;
+    char * pcName;
+    configSTACK_DEPTH_TYPE usStackDepth = STACK_DEPTH;
+    void * pvParameters;
+    TaskHandle_t * pxCreatedTask;
+
+    UBaseType_t uxPriority;
+
+    __CPROVER_assume( uxPriority < configMAX_PRIORITIES );
+
+    vNondetSetCurrentTCB();
+    vSetGlobalVariables();
+    vPrepareTaskLists();
+
+    pxCreatedTask = pxNondetSetTaskHandle();
+    pcName = pcNondetSetString( configMAX_TASK_NAME_LEN );
+
+    xTaskCreate( pxTaskCode,
+                 pcName,
+                 usStackDepth,
+                 pvParameters,
+                 uxPriority,
+                 pxCreatedTask );
+}

kernel/FreeRTOS/Test/CBMC/proofs/Task/TaskCreate/cbmc-viewer.json

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+{ "expected-missing-functions":
+  [
+    "vApplicationTickHook",
+
+    "pxPortInitialiseStack",
+    "vPortCloseRunningThread",
+    "vPortDeleteThread",
+    "vPortEnterCritical",
+    "vPortExitCritical",
+    "vPortGenerateSimulatedInterrupt",
+    "xPortStartScheduler",
+
+    "pvTaskIncrementMutexHeldCount",
+    "uxTaskGetTaskNumber",
+    "vTaskInternalSetTimeOutState",
+    "vTaskMissedYield",
+    "vTaskPlaceOnEventList",
+    "vTaskPriorityDisinheritAfterTimeout",
+    "vTaskSuspendAll",
+    "xTaskGetCurrentTaskHandle",
+    "xTaskPriorityDisinherit",
+    "xTaskPriorityInherit",
+    "xTaskRemoveFromEventList",
+    "xTaskResumeAll"
+  ],
+  "proof-name": "TaskCreate",
+  "proof-root": "Test/CBMC/proofs"
+}

kernel/FreeRTOS/Test/CBMC/proofs/Task/TaskCreate/tasks_test_access_functions.h

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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.
+ *
+ * https://aws.amazon.com/freertos
+ * https://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;
+}