nuttx/binfmt/binfmt_loadmodule.c

/****************************************************************************
 * binfmt/binfmt_loadmodule.c
 *
 *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * 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 <sys/types.h>

#include <sched.h>
#include <debug.h>
#include <errno.h>

#include <nuttx/binfmt.h>

#include "binfmt_internal.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

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

/****************************************************************************
 * Name: load_module
 *
 * Description:
 *   Load a module into memory and prep it for execution.
 *
 * Returned Value:
 *   This is an end-user function, so it follows the normal convention:
 *   Returns 0 (OK) on success.  On failure, it returns -1 (ERROR) with
 *   errno set appropriately.
 *
 ****************************************************************************/

int load_module(const char *filename, FAR struct binary_s *bin)
{
  FAR struct binfmt_s *binfmt;
  int ret;

#ifdef CONFIG_DEBUG
  if (!filename || !bin)
    {
      ret = -EINVAL;
    }
  else
    {
#endif
      bdbg("Loading %s\n", filename);

      /* Disabling pre-emption should be sufficient protection while
       * accessing the list of registered binary format handlers.
       */

      sched_lock();

      /* Traverse the list of registered binary format handlers.  Stop
       * when either (1) a handler recognized and loads the format, or
       * (2) no handler recognizes the format.
       */

      for (binfmt = g_binfmts; binfmt; binfmt = binfmt->next)
        {
          /* Use this handler to try to load the format */

          ret = binfmt->load(bin);
          if (ret == OK)
            {

              /* Successfully loaded -- break out with ret == 0 */

              dump_module(bin);
              break;
            }
        }

      sched_unlock();
    }

  /* This is an end-user function.  Return failures via errno */

  if (ret < 0)
    {
      bdbg("Returning errno %d\n", -ret);
      errno = -ret;
      return ERROR;
    }
  return OK;
}