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/*
* Copyright (c) 2012-2014 Wind River Systems, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* @brief Compiler stack protection (kernel part)
*
* This module provides functions to support compiler stack protection
* using canaries. This feature is enabled with configuration
* CONFIG_STACK_CANARIES=y.
*
* When this feature is enabled, the compiler generated code refers to
* function __stack_chk_fail and global variable __stack_chk_guard.
*/
#include <toolchain.h> /* compiler specific configurations */
#include <kernel_structs.h>
#include <toolchain.h>
#include <sections.h>
/**
*
* @brief Stack canary error handler
*
* This function is invoked when a stack canary error is detected.
*
* @return Does not return
*/
void FUNC_NORETURN _StackCheckHandler(void)
{
/* Stack canary error is a software fatal condition; treat it as such.
*/
_NanoFatalErrorHandler(_NANO_ERR_STACK_CHK_FAIL, &_default_esf);
}
/* Global variable */
/*
* Symbol referenced by GCC compiler generated code for canary value.
* The canary value gets initialized in _Cstart().
*/
void __noinit *__stack_chk_guard;
/**
*
* @brief Referenced by GCC compiler generated code
*
* This routine is invoked when a stack canary error is detected, indicating
* a buffer overflow or stack corruption problem.
*/
FUNC_ALIAS(_StackCheckHandler, __stack_chk_fail, void);