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- /****************************************************************************
- * sched/module/mod_modsym.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 <assert.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/module.h>
- #include <nuttx/symtab.h>
- #include <nuttx/lib/modlib.h>
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: modsym
- *
- * Description:
- * modsym() returns the address of a symbol defined within the object that
- * was previously made accessible through a insmod() call. handle is the
- * value returned from a call to insmod() (and which has not since been
- * released via a call to rmmod()), name is the symbol's name as a
- * character string.
- *
- * The returned symbol address will remain valid until rmmod() is called.
- *
- * Input Parameters:
- * handle - The opaque, non-NULL value returned by a previous successful
- * call to insmod().
- * name - A pointer to the symbol name string.
- *
- * Returned Value:
- * The address associated with the symbol is returned on success.
- * If handle does not refer to a valid module opened by insmod(), or if
- * the named symbol cannot be found within any of the objects associated
- * with handle, modsym() will return NULL and the errno variable will be
- * set appropriately.
- *
- * NOTE: This means that the address zero can never be a valid return
- * value.
- *
- ****************************************************************************/
- FAR const void *modsym(FAR void *handle, FAR const char *name)
- {
- FAR struct module_s *modp = (FAR struct module_s *)handle;
- FAR const struct symtab_s *symbol;
- int err;
- int ret;
- /* Verify that the module is in the registry */
- modlib_registry_lock();
- ret = modlib_registry_verify(modp);
- if (ret < 0)
- {
- berr("ERROR: Failed to verify module: %d\n", ret);
- err = -ret;
- goto errout_with_lock;
- }
- /* Does the module have a symbol table? */
- if (modp->modinfo.exports == NULL || modp->modinfo.nexports == 0)
- {
- berr("ERROR: Module has no symbol table\n");
- err = ENOENT;
- goto errout_with_lock;
- }
- /* Search the symbol table for the matching symbol */
- symbol = symtab_findbyname(modp->modinfo.exports, name,
- modp->modinfo.nexports);
- if (symbol == NULL)
- {
- berr("ERROR: Failed to find symbol in symbol \"$s\" in table\n", name);
- err = ENOENT;
- goto errout_with_lock;
- }
- /* Return the address within the module associated with the symbol */
- modlib_registry_unlock();
- DEBUGASSERT(symbol->sym_value != NULL);
- return symbol->sym_value;
- errout_with_lock:
- modlib_registry_unlock();
- set_errno(err);
- return NULL;
- }
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