nes-proj/os/sys/stack-check.h

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2017-11-22 17:48:39 +00:00
/*
* Copyright (c) 2017, University of Bristol - http://www.bris.ac.uk/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/**
* \file
* Stack checker library header file.
* \author
* Atis Elsts <atis.elsts@bristol.ac.uk>
*/
/** \addtogroup sys
* @{ */
/**
* \defgroup stack Stack checker library
*
* Basic support for stack guards and stack overflow detection.
* On startup, fills the area between the stack and the heap with a known pattern.
* During execution, the fill can be checked in order to find out
* the extent to which the stack has been used.
*
*
* @{
*/
#ifndef STACK_CHECK_H_
#define STACK_CHECK_H_
#include "contiki-conf.h"
/* Determine whether stack checking is supported depending on the plaform. */
#ifdef PLATFORM_CONF_SUPPORTS_STACK_CHECK
#if !PLATFORM_CONF_SUPPORTS_STACK_CHECK
/* Stack checker cannot be enabled, since the platform does not support it */
#undef STACK_CHECK_CONF_ENABLED
#define STACK_CHECK_CONF_ENABLED 0
#endif /* !PLATFORM_CONF_SUPPORTS_STACK_CHECK */
#endif /* ifdef PLATFORM_CONF_SUPPORTS_STACK_CHECK */
/* If this is disabled, the functions are no-ops */
#ifdef STACK_CHECK_CONF_ENABLED
#define STACK_CHECK_ENABLED STACK_CHECK_CONF_ENABLED
#else
#define STACK_CHECK_ENABLED 1 /* Enable by default */
#endif
/* Perform periodic stack integrity checks? */
#ifdef STACK_CHECK_CONF_PERIODIC_CHECKS
#define STACK_CHECK_PERIODIC_CHECKS STACK_CHECK_CONF_PERIODIC_CHECKS
#else
#define STACK_CHECK_PERIODIC_CHECKS 1 /* Enable by default */
#endif
/* How often to do the periodic integrity checks, if enabled? */
#ifdef STACK_CHECK_CONF_PERIOD
#define STACK_CHECK_PERIOD STACK_CHECK_CONF_PERIOD
#else
#define STACK_CHECK_PERIOD (10 * CLOCK_SECOND)
#endif
/**
* \brief Initialize the stack area with a known pattern
*
* This function initializes the memory between the stack and heap
* areas. The function should be called by the system
* during boot-up.
*/
void stack_check_init(void);
/**
* \brief Calculate the maximal stack usage so far.
*
* This function relies on the assumption that the stack memory
* that has been reserved by functions and local variables
* is actually overwritten with new contents. If the stack is
* just reserved, but not used, the function will fail to detect
* that usage.
* In addition, this function can warn if the stack memory range
* has been completely used, but it cannot detect
* and warn if stack overflow has already taken place.
*/
uint16_t stack_check_get_usage(void);
/**
* \brief Calculate the maximal permitted stack usage.
*
* This function returns the number of bytes between the origin
* of the stack and the end of heap.
*/
uint16_t stack_check_get_reserved_size(void);
/**
* \brief The origin point from which the stack grows (an optional #define)
*
*/
#ifdef STACK_CONF_ORIGIN
#define STACK_ORIGIN STACK_CONF_ORIGIN
#endif
#endif /* STACK_CHECK_H_ */
/** @} */
/** @} */