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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;
}
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