nuttx/libs/libc/modlib/modlib_init.c

187 lines
5.5 KiB
C
Raw Normal View History

/****************************************************************************
* libs/libc/modlib/modlib_init.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/stat.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/fs/fs.h>
#include <nuttx/lib/modlib.h>
#include "modlib/modlib.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* CONFIG_DEBUG_FEATURES, CONFIG_DEBUG_INFO, and CONFIG_MODLIB_DUMPBUFFER
* have to be defined or CONFIG_MODLIB_DUMPBUFFER does nothing.
*/
#if !defined(CONFIG_DEBUG_INFO) || !defined (CONFIG_MODLIB_DUMPBUFFER)
# undef CONFIG_MODLIB_DUMPBUFFER
#endif
#ifdef CONFIG_MODLIB_DUMPBUFFER
# define modlib_dumpbuffer(m,b,n) binfodumpbuffer(m,b,n)
#else
# define modlib_dumpbuffer(m,b,n)
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: modlib_filelen
*
* Description:
* Get the size of the ELF file
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
static inline int modlib_filelen(FAR struct mod_loadinfo_s *loadinfo,
FAR const char *filename)
{
struct stat buf;
int ret;
/* Get the file stats */
ret = _NX_STAT(filename, &buf);
if (ret < 0)
{
int errval = _NX_GETERRNO(ret);
berr("ERROR: Failed to stat file: %d\n", errval);
return -errval;
}
/* Verify that it is a regular file */
if (!S_ISREG(buf.st_mode))
{
berr("ERROR: Not a regular file. mode: %d\n", buf.st_mode);
return -ENOENT;
}
/* TODO: Verify that the file is readable. Not really important because
* we will detect this when we try to open the file read-only.
*/
/* Return the size of the file in the loadinfo structure */
loadinfo->filelen = buf.st_size;
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: modlib_initialize
*
* Description:
* This function is called to configure the library to process an ELF
* program binary.
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int modlib_initialize(FAR const char *filename,
FAR struct mod_loadinfo_s *loadinfo)
{
int ret;
binfo("filename: %s loadinfo: %p\n", filename, loadinfo);
/* Clear the load info structure */
memset(loadinfo, 0, sizeof(struct mod_loadinfo_s));
loadinfo->filfd = -1;
/* Get the length of the file. */
ret = modlib_filelen(loadinfo, filename);
if (ret < 0)
{
berr("ERROR: modlib_filelen failed: %d\n", ret);
return ret;
}
/* Open the binary file for reading (only) */
loadinfo->filfd = _NX_OPEN(filename, O_RDONLY);
if (loadinfo->filfd < 0)
{
int errval = _NX_GETERRNO(loadinfo->filfd);
berr("ERROR: Failed to open ELF binary %s: %d\n", filename, errval);
return -errval;
}
/* Read the ELF ehdr from offset 0 */
ret = modlib_read(loadinfo, (FAR uint8_t *)&loadinfo->ehdr,
sizeof(Elf_Ehdr), 0);
if (ret < 0)
{
berr("ERROR: Failed to read ELF header: %d\n", ret);
return ret;
}
modlib_dumpbuffer("ELF header", (FAR const uint8_t *)&loadinfo->ehdr,
sizeof(Elf_Ehdr));
/* Verify the ELF header */
ret = modlib_verifyheader(&loadinfo->ehdr);
if (ret < 0)
{
/* This may not be an error because we will be called to attempt
* loading EVERY binary. If modlib_verifyheader() does not recognize
* the ELF header, it will -ENOEXEC which simply informs the system
* that the file is not an ELF file. modlib_verifyheader() will return
* other errors if the ELF header is not correctly formed.
*/
berr("ERROR: Bad ELF header: %d\n", ret);
return ret;
}
return OK;
}