nuttx-apps/platform/samd21-xplained/sam_cxxinitialize.c

/****************************************************************************
 * apps/platform/samd21-xplained/src/sam_cxxinitialize.c
 *
 *   Copyright (C) 2015-2016 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 <debug.h>

#include <nuttx/arch.h>

#if defined(CONFIG_HAVE_CXX) && defined(CONFIG_HAVE_CXXINITIALIZE)

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
/* Debug ********************************************************************/
/* Non-standard debug that may be enabled just for testing the static
 * constructors.
 */

#ifdef CONFIG_DEBUG_CXX
#  define cxxinfo        _info
#else
#  define cxxinfo(x...)
#endif

/****************************************************************************
 * Private Types
 ****************************************************************************/
/* This type defines one entry in initialization array */

typedef 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 uint32_t _stext;
extern uint32_t _etext;

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: up_cxxinitialize
 *
 * 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 up_cxxinitialize(void)
{
  initializer_t *initp;

  cxxinfo("_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;
      cxxinfo("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 ((void *)initializer > (void *)&_stext &&
          (void *)initializer < (void *)&_etext)
        {
          cxxinfo("Calling %p\n", initializer);
          initializer();
        }
    }
}

#endif /* CONFIG_HAVE_CXX && CONFIG_HAVE_CXXINITIALIZE */