162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
/****************************************************************************
|
|
* 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"
|
|
|
|
/****************************************************************************
|
|
* 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)
|
|
{
|
|
struct stat buf;
|
|
int ret;
|
|
|
|
/* Get the file stats */
|
|
|
|
ret = _NX_STAT(loadinfo->filfd, &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;
|
|
}
|
|
|
|
/* 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));
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* Get the length of the file. */
|
|
|
|
ret = modlib_filelen(loadinfo);
|
|
if (ret < 0)
|
|
{
|
|
berr("ERROR: modlib_filelen failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* 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;
|
|
}
|