cxx_init.c
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/****************************************************************************
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sched.h>
#include <stdlib.h>
#include <assert.h>
#ifdef CONFIG_HAVE_CXXINITIALIZE
#include "cxx_init.h"
/****************************************************************************
* Private Types
****************************************************************************/
/* This type defines one entry in initialization array */
typedef CODE void (*initializer_t)(void);
/****************************************************************************
* External References
****************************************************************************/
/* _sinit and _einit are symbols exported by the linker script that mark the
* beginning and the end of the C++ initialization section.
*/
extern initializer_t _sinit;
extern initializer_t _einit;
/* _stext and _etext are symbols exported by the linker script that mark the
* beginning and the end of text.
*/
extern uintptr_t _stext;
extern uintptr_t _etext;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: cxx_initialize
*
* Description:
* If C++ and C++ static constructors are supported, then this function
* must be provided by board-specific logic in order to perform
* initialization of the static C++ class instances.
*
* This function should then be called in the application-specific
* user_start logic in order to perform the C++ initialization. NOTE
* that no component of the core NuttX RTOS logic is involved; this
* function definition only provides the 'contract' between application
* specific C++ code and platform-specific toolchain support.
*
****************************************************************************/
void cxx_initialize(void)
{
static int inited = 0;
if (inited == 0) {
initializer_t *initp;
sinfo("_sinit: %p _einit: %p _stext: %p _etext: %p\n",
&_sinit, &_einit, &_stext, &_etext);
/* Visit each entry in the initialization table */
for (initp = &_sinit; initp != &_einit; initp++) {
initializer_t initializer = *initp;
sinfo("initp: %p initializer: %p\n", initp, initializer);
/* Make sure that the address is non-NULL and lies in the text
* region defined by the linker script. Some toolchains may put
* NULL values or counts in the initialization table.
*/
if ((FAR void *)initializer >= (FAR void *)&_stext &&
(FAR void *)initializer < (FAR void *)&_etext) {
sinfo("Calling %p\n", initializer);
initializer();
}
}
inited = 1;
}
}
#endif