nuttx/libs/libc/dlfcn/lib_dlsymtab.c

/****************************************************************************
 * libs/libc/dlfcn/lib_symtab.c
 *
 *   Copyright (C) 2017 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 <dlfcn.h>
#include <errno.h>

#include <nuttx/module.h>
#include <nuttx/lib/modlib.h>

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

/****************************************************************************
 * Name: dlsymtab
 *
 * Description:
 *   dlsymtab() is a non-standard shared library interface.  It selects the
 *   symbol table to use when binding a shared library to the base firmware
 *   which may be in FLASH memory.
 *
 * Input Parameters:
 *   symtab   - The new symbol table.
 *   nsymbols - The number of symbols in the symbol table.
 *
 * Returned Value:
 *   Always returns OK.
 *
 ****************************************************************************/

int dlsymtab(FAR const struct symtab_s *symtab, int nsymbols)
{
#ifdef CONFIG_BUILD_KERNEL
  /* The KERNEL build is considerably more complex:  In order to be shared,
   * the .text portion of the module must be (1) build for PIC/PID operation
   * and (2) must like in a shared memory region accessible from all
   * processes.  The .data/.bss portion of the module must be allocated in
   * the user space of each process, but must lie at the same virtual address
   * so that it can be referenced from the one copy of the text in the shared
   * memory region.
   */

#warning Missing logic
  return -ENOSYS;

#else
  /* Set the symbol take information that will be used by this instance of
   * the module library.
   */

  modlib_setsymtab(symtab, nsymbols);
  return OK;
#endif
}