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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"
/*
* 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;
}
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