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- /****************************************************************************
- * 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 = stat(filename, &buf);
- if (ret < 0)
- {
- int errval = get_errno();
- 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));
- /* 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;
- }
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