130 lines
4.5 KiB
C
130 lines
4.5 KiB
C
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/*
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* Copyright (c) 2017, University of Bristol - http://www.bris.ac.uk/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \file
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* Stack checker library header file.
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* \author
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* Atis Elsts <atis.elsts@bristol.ac.uk>
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*/
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/** \addtogroup sys
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* @{ */
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/**
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* \defgroup stack Stack checker library
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*
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* Basic support for stack guards and stack overflow detection.
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* On startup, fills the area between the stack and the heap with a known pattern.
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* During execution, the fill can be checked in order to find out
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* the extent to which the stack has been used.
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*
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* @{
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*/
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#ifndef STACK_CHECK_H_
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#define STACK_CHECK_H_
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#include "contiki-conf.h"
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/* Determine whether stack checking is supported depending on the plaform. */
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#ifdef PLATFORM_CONF_SUPPORTS_STACK_CHECK
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#if !PLATFORM_CONF_SUPPORTS_STACK_CHECK
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/* Stack checker cannot be enabled, since the platform does not support it */
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#undef STACK_CHECK_CONF_ENABLED
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#define STACK_CHECK_CONF_ENABLED 0
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#endif /* !PLATFORM_CONF_SUPPORTS_STACK_CHECK */
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#endif /* ifdef PLATFORM_CONF_SUPPORTS_STACK_CHECK */
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/* If this is disabled, the functions are no-ops */
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#ifdef STACK_CHECK_CONF_ENABLED
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#define STACK_CHECK_ENABLED STACK_CHECK_CONF_ENABLED
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#else
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#define STACK_CHECK_ENABLED 1 /* Enable by default */
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#endif
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/* Perform periodic stack integrity checks? */
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#ifdef STACK_CHECK_CONF_PERIODIC_CHECKS
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#define STACK_CHECK_PERIODIC_CHECKS STACK_CHECK_CONF_PERIODIC_CHECKS
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#else
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#define STACK_CHECK_PERIODIC_CHECKS 1 /* Enable by default */
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#endif
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/* How often to do the periodic integrity checks, if enabled? */
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#ifdef STACK_CHECK_CONF_PERIOD
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#define STACK_CHECK_PERIOD STACK_CHECK_CONF_PERIOD
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#else
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#define STACK_CHECK_PERIOD (10 * CLOCK_SECOND)
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#endif
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/**
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* \brief Initialize the stack area with a known pattern
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*
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* This function initializes the memory between the stack and heap
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* areas. The function should be called by the system
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* during boot-up.
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*/
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void stack_check_init(void);
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/**
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* \brief Calculate the maximal stack usage so far.
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*
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* This function relies on the assumption that the stack memory
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* that has been reserved by functions and local variables
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* is actually overwritten with new contents. If the stack is
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* just reserved, but not used, the function will fail to detect
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* that usage.
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* In addition, this function can warn if the stack memory range
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* has been completely used, but it cannot detect
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* and warn if stack overflow has already taken place.
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*/
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uint16_t stack_check_get_usage(void);
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/**
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* \brief Calculate the maximal permitted stack usage.
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*
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* This function returns the number of bytes between the origin
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* of the stack and the end of heap.
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*/
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uint16_t stack_check_get_reserved_size(void);
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/**
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* \brief The origin point from which the stack grows (an optional #define)
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*
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*/
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#ifdef STACK_CONF_ORIGIN
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#define STACK_ORIGIN STACK_CONF_ORIGIN
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#endif
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#endif /* STACK_CHECK_H_ */
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/** @} */
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/** @} */
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