3521aaf944
binfmt/, configs/, grahics/, libc/, mm/, net/, sched/: OS references to the errno variable should always use the set_errno(), get_errno() macros arch/arm/src/stm32 and stm32f7: Architecture-specific code is not permitted to modify the errno variable. drivers/ and libc/: OS references to the errno variable should always use the set_errno(), get_errno() macros
202 lines
6.2 KiB
C
202 lines
6.2 KiB
C
/****************************************************************************
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* libc/modlib/modlib_init.c
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*
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* Copyright (C) 2015, 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 <sys/stat.h>
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#include <stdint.h>
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#include <string.h>
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#include <fcntl.h>
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#include <elf32.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/module.h>
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#include <nuttx/lib/modlib.h>
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#include "modlib/modlib.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* CONFIG_DEBUG_FEATURES, CONFIG_DEBUG_INFO, and CONFIG_MODLIB_DUMPBUFFER
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* have to be defined or CONFIG_MODLIB_DUMPBUFFER does nothing.
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*/
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#if !defined(CONFIG_DEBUG_INFO) || !defined (CONFIG_MODLIB_DUMPBUFFER)
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# undef CONFIG_MODLIB_DUMPBUFFER
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#endif
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#ifdef CONFIG_MODLIB_DUMPBUFFER
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# define modlib_dumpbuffer(m,b,n) sinfodumpbuffer(m,b,n)
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#else
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# define modlib_dumpbuffer(m,b,n)
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: modlib_filelen
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*
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* Description:
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* Get the size of the ELF file
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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static inline int modlib_filelen(FAR struct mod_loadinfo_s *loadinfo,
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FAR const char *filename)
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{
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struct stat buf;
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int ret;
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/* Get the file stats */
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ret = stat(filename, &buf);
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if (ret < 0)
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{
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int errval = get_errno();
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serr("ERROR: Failed to stat file: %d\n", errval);
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return -errval;
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}
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/* Verify that it is a regular file */
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if (!S_ISREG(buf.st_mode))
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{
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serr("ERROR: Not a regular file. mode: %d\n", buf.st_mode);
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return -ENOENT;
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}
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/* TODO: Verify that the file is readable. Not really important because
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* we will detect this when we try to open the file read-only.
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*/
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/* Return the size of the file in the loadinfo structure */
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loadinfo->filelen = buf.st_size;
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: modlib_initialize
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*
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* Description:
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* This function is called to configure the library to process an ELF
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* program binary.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int modlib_initialize(FAR const char *filename,
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FAR struct mod_loadinfo_s *loadinfo)
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{
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int ret;
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sinfo("filename: %s loadinfo: %p\n", filename, loadinfo);
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/* Clear the load info structure */
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memset(loadinfo, 0, sizeof(struct mod_loadinfo_s));
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/* Get the length of the file. */
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ret = modlib_filelen(loadinfo, filename);
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if (ret < 0)
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{
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serr("ERROR: modlib_filelen failed: %d\n", ret);
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return ret;
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}
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/* Open the binary file for reading (only) */
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loadinfo->filfd = open(filename, O_RDONLY);
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if (loadinfo->filfd < 0)
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{
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int errval = get_errno();
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serr("ERROR: Failed to open ELF binary %s: %d\n", filename, errval);
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return -errval;
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}
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/* Read the ELF ehdr from offset 0 */
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ret = modlib_read(loadinfo, (FAR uint8_t *)&loadinfo->ehdr,
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sizeof(Elf32_Ehdr), 0);
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if (ret < 0)
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{
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serr("ERROR: Failed to read ELF header: %d\n", ret);
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return ret;
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}
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modlib_dumpbuffer("ELF header", (FAR const uint8_t *)&loadinfo->ehdr,
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sizeof(Elf32_Ehdr));
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/* Verify the ELF header */
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ret = modlib_verifyheader(&loadinfo->ehdr);
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if (ret < 0)
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{
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/* This may not be an error because we will be called to attempt loading
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* EVERY binary. If modlib_verifyheader() does not recognize the ELF header,
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* it will -ENOEXEC whcih simply informs the system that the file is not an
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* ELF file. modlib_verifyheader() will return other errors if the ELF header
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* is not correctly formed.
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*/
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serr("ERROR: Bad ELF header: %d\n", ret);
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return ret;
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}
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return OK;
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}
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