1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* 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( void )
{
TCB_t * pxTCB = pvPortMalloc(sizeof(TCB_t));
if ( pxTCB == NULL )
return NULL;
__CPROVER_assume( pxTCB->uxPriority < configMAX_PRIORITIES );
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 xPendedTicks since __CPROVER_assume does not work
* well with statically initialised variables
*/
void vSetGlobalVariables( void ) {
UBaseType_t uxNonZeroValue;
__CPROVER_assume( uxNonZeroValue != 0 );
uxSchedulerSuspended = uxNonZeroValue;
xPendedTicks = nondet_bool() ? PENDED_TICKS : 0;
uxCurrentNumberOfTasks = nondet_ubasetype();
xTickCount = nondet_ticktype();
}
/*
* We initialise and fill the task lists so coverage is optimal.
* This initialization is not guaranteed to be minimal, but it
* is quite efficient and it serves the same purpose
*/
BaseType_t xPrepareTaskLists( void )
{
TCB_t * pxTCB = NULL;
__CPROVER_assert_zero_allocation();
prvInitialiseTaskLists();
/* This task will be moved to a ready list, granting coverage
* on lines 2780-2786 (tasks.c) */
pxTCB = xUnconstrainedTCB();
if ( pxTCB == NULL )
{
return pdFAIL;
}
vListInsert( pxOverflowDelayedTaskList, &( pxTCB->xStateListItem ) );
/* Use of this macro ensures coverage on line 185 (list.c) */
listGET_OWNER_OF_NEXT_ENTRY( pxTCB , pxOverflowDelayedTaskList );
pxTCB = xUnconstrainedTCB();
if ( pxTCB == NULL )
{
return pdFAIL;
}
vListInsert( &xPendingReadyList, &( pxTCB->xStateListItem ) );
vListInsert( pxOverflowDelayedTaskList, &( pxTCB->xEventListItem ) );
pxTCB = xUnconstrainedTCB();
if ( pxTCB == NULL )
{
return pdFAIL;
}
vListInsert( pxOverflowDelayedTaskList, &( pxTCB->xStateListItem ) );
/* This nondeterministic choice ensure coverage in line 2746 (tasks.c) */
if ( nondet_bool() )
{
vListInsert( pxOverflowDelayedTaskList, &( pxTCB->xEventListItem ) );
}
pxCurrentTCB = xUnconstrainedTCB();
if ( pxCurrentTCB == NULL )
{
return pdFAIL;
}
vListInsert( &pxReadyTasksLists[ pxCurrentTCB->uxPriority ], &( pxCurrentTCB->xStateListItem ) );
return pdPASS;
}
|
