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nuttx-bb/nuttx/binfmt/binfmt_loadmodule.c

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/****************************************************************************
* binfmt/binfmt_loadmodule.c
*
* Copyright (C) 2009, 2014 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 <sched.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
#include <nuttx/binfmt/binfmt.h>
#include "binfmt_internal.h"
#ifndef CONFIG_BINFMT_DISABLE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: load_default_priority
*
* Description:
* Set the default priority of the module to be loaded. This may be
* changed (1) by the actions of the binary format's load() method if
* the binary format contains priority information, or (2) by the user
* between calls to load_module() and exec_module().
*
* Returned Value:
* Zero (OK) is returned on success; Otherwise, -1 (ERROR) is returned and
* the errno variable is set appropriately.
*
****************************************************************************/
static int load_default_priority(FAR struct binary_s *bin)
{
struct sched_param param;
int ret;
/* Get the priority of this thread */
ret = sched_getparam(0, &param);
if (ret < 0)
{
bdbg("ERROR: sched_getparam failed: %d\n", errno);
return ERROR;
}
/* Save that as the priority of child thread */
bin->priority = param.sched_priority;
return ret;
}
/****************************************************************************
* Name: load_absmodule
*
* Description:
* Load a module into memory, bind it to an exported symbol take, and
* prep the module for execution. bin->filename is known to be an absolute
* path to the file to be loaded.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* failure.
*
****************************************************************************/
static int load_absmodule(FAR struct binary_s *bin)
{
FAR struct binfmt_s *binfmt;
int ret = -ENOENT;
bdbg("Loading %s\n", bin->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 */
bvdbg("Successfully loaded module %s\n", bin->filename);
/* Save the unload method for use by unload_module */
bin->unload = binfmt->unload;
dump_module(bin);
break;
}
}
sched_unlock();
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: load_module
*
* Description:
* Load a module into memory, bind it to an exported symbol take, and
* prep the module 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(FAR struct binary_s *bin)
{
int ret = -EINVAL;
/* Verify that we were provided something to work with */
#ifdef CONFIG_DEBUG
if (bin && bin->filename)
#endif
{
/* Set the default priority of the new program. */
ret = load_default_priority(bin);
if (ret < 0)
{
/* The errno is already set in this case */
return ERROR;
}
/* Were we given a relative path? Or an absolute path to the file to
* be loaded? Absolute paths start with '/'.
*/
#ifdef CONFIG_BINFMT_EXEPATH
if (bin->filename[0] != '/')
{
FAR const char *relpath;
FAR char *fullpath;
EXEPATH_HANDLE handle;
/* Set aside the relative path */
relpath = bin->filename;
ret = -ENOENT;
/* Initialize to traverse the PATH variable */
handle = exepath_init();
if (handle)
{
/* Get the next absolute file path */
while ((fullpath = exepath_next(handle, relpath)) != NULL)
{
/* Try to load the file at this path */
bin->filename = fullpath;
ret = load_absmodule(bin);
/* Free the allocated fullpath */
kfree(fullpath);
/* Break out of the loop with ret == OK on success */
if (ret == OK)
{
break;
}
}
/* Release the traversal handle */
exepath_release(handle);
}
/* Restore the relative path. This is not needed for anything
* but debug output after the file has been loaded.
*/
bin->filename = relpath;
}
else
#endif
{
/* We already have the one and only absolute path to the file to
* be loaded.
*/
ret = load_absmodule(bin);
}
}
/* 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;
}
#endif /* CONFIG_BINFMT_DISABLE */
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