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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 an unconstrained TCB or return NULL if it fails
*/
TaskHandle_t xUnconstrainedTCB( void )
{
TCB_t * pxTCB = pvPortMalloc(sizeof(TCB_t));
if ( pxTCB == NULL )
return NULL;
return pxTCB;
}
StaticTask_t *pxIdleTaskTCB;
StaticTask_t *pxTimerTaskTCB;
StackType_t *pxIdleTaskStack;
StackType_t *pxTimerTaskStack;
/*
* `pxCurrentTCB` allocation is allowed to fail. The global variables above
* this comment are used in the stubbed functions `vApplicationGetIdleTaskMemory`
* and `vApplicationGetTimerTaskMemory` (at the end of this file) and buffer allocation
* must be succesful for the proof to have no errors
*/
BaseType_t xPrepareTasks( void )
{
__CPROVER_assert_zero_allocation();
prvInitialiseTaskLists();
pxCurrentTCB = xUnconstrainedTCB();
pxIdleTaskTCB = pvPortMalloc(sizeof(StaticTask_t));
if (pxIdleTaskTCB == NULL )
{
return pdFAIL;
}
pxIdleTaskStack = pvPortMalloc( sizeof(StackType_t) * configMINIMAL_STACK_SIZE );
if ( pxIdleTaskStack == NULL )
{
return pdFAIL;
}
pxTimerTaskTCB = pvPortMalloc( sizeof(StaticTask_t) );
if ( pxTimerTaskTCB == NULL )
{
return pdFAIL;
}
pxTimerTaskStack = pvPortMalloc( sizeof(StackType_t) * configTIMER_TASK_STACK_DEPTH );
if ( pxTimerTaskStack == NULL )
{
return pdFAIL;
}
return pdPASS;
}
/*
* The buffers used here have been succesfully allocated before (global variables)
*/
void vApplicationGetIdleTaskMemory( StaticTask_t ** ppxIdleTaskTCBBuffer,
StackType_t ** ppxIdleTaskStackBuffer,
uint32_t * pulIdleTaskStackSize )
{
*ppxIdleTaskTCBBuffer = pxIdleTaskTCB;
*ppxIdleTaskStackBuffer = pxIdleTaskStack;
*pulIdleTaskStackSize = configMINIMAL_STACK_SIZE;
}
/*
* The buffers used here have been succesfully allocated before (global variables)
*/
void vApplicationGetTimerTaskMemory( StaticTask_t **ppxTimerTaskTCBBuffer, StackType_t **ppxTimerTaskStackBuffer, uint32_t *pulTimerTaskStackSize )
{
*ppxTimerTaskTCBBuffer = pxTimerTaskTCB;
*ppxTimerTaskStackBuffer = pxTimerTaskStack;
*pulTimerTaskStackSize = configTIMER_TASK_STACK_DEPTH;
}
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