132 lines
4.7 KiB
C
132 lines
4.7 KiB
C
/****************************************************************************
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* sched/module/mod_modsym.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/module.h>
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#include <nuttx/symtab.h>
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#include <nuttx/lib/modlib.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: modsym
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*
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* Description:
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* modsym() returns the address of a symbol defined within the object that
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* was previously made accessible through a insmod() call. handle is the
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* value returned from a call to insmod() (and which has not since been
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* released via a call to rmmod()), name is the symbol's name as a
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* character string.
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*
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* The returned symbol address will remain valid until rmmod() is called.
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*
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* Input Parameters:
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* handle - The opaque, non-NULL value returned by a previous successful
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* call to insmod().
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* name - A pointer to the symbol name string.
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*
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* Returned Value:
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* The address associated with the symbol is returned on success.
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* If handle does not refer to a valid module opened by insmod(), or if
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* the named symbol cannot be found within any of the objects associated
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* with handle, modsym() will return NULL and the errno variable will be
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* set appropriately.
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*
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* NOTE: This means that the address zero can never be a valid return
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* value.
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*
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****************************************************************************/
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FAR const void *modsym(FAR void *handle, FAR const char *name)
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{
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FAR struct module_s *modp = (FAR struct module_s *)handle;
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FAR const struct symtab_s *symbol;
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int err;
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int ret;
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/* Verify that the module is in the registry */
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modlib_registry_lock();
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ret = modlib_registry_verify(modp);
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if (ret < 0)
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{
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berr("ERROR: Failed to verify module: %d\n", ret);
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err = -ret;
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goto errout_with_lock;
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}
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/* Does the module have a symbol table? */
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if (modp->modinfo.exports == NULL || modp->modinfo.nexports == 0)
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{
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berr("ERROR: Module has no symbol table\n");
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err = ENOENT;
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goto errout_with_lock;
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}
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/* Search the symbol table for the matching symbol */
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symbol = symtab_findbyname(modp->modinfo.exports, name,
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modp->modinfo.nexports);
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if (symbol == NULL)
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{
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berr("ERROR: Failed to find symbol in symbol \"$s\" in table\n", name);
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err = ENOENT;
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goto errout_with_lock;
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}
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/* Return the address within the module associated with the symbol */
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modlib_registry_unlock();
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DEBUGASSERT(symbol->sym_value != NULL);
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return symbol->sym_value;
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errout_with_lock:
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modlib_registry_unlock();
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set_errno(err);
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return NULL;
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}
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