a7fd58c4db
many locations: Change occurences of open() followed by file_detach() to file_open(). Change most non-controversion calls to open() to nx_open().
fs/inode/fs_fileopen.c: Flesh out file_open() with some interim, placeholder logic.
fs/inode/fs_fileopen.c: Add a framework for a file_open() implementation (no real logic in place yet).
fs/vfs/fs_open.c: Add nx_open() which is the same as open() except that it does not create a cancellation point nor does it modify the errno variable.
204 lines
6.2 KiB
C
204 lines
6.2 KiB
C
/****************************************************************************
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* binfmt/libelf/libelf_init.c
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*
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* Copyright (C) 2012 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/fs/fs.h>
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#include <nuttx/binfmt/elf.h>
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#include "libelf.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_DEBUG_BINFMT have to be
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* defined or CONFIG_ELF_DUMPBUFFER does nothing.
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*/
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#if !defined(CONFIG_DEBUG_INFO) || !defined (CONFIG_DEBUG_BINFMT)
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# undef CONFIG_ELF_DUMPBUFFER
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#endif
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#ifdef CONFIG_ELF_DUMPBUFFER
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# define elf_dumpbuffer(m,b,n) binfodumpbuffer(m,b,n)
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#else
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# define elf_dumpbuffer(m,b,n)
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#endif
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/****************************************************************************
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* Private Constant Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: elf_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 elf_filelen(FAR struct elf_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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berr("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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berr("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: elf_init
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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 elf_init(FAR const char *filename, FAR struct elf_loadinfo_s *loadinfo)
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{
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int ret;
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binfo("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 elf_loadinfo_s));
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/* Get the length of the file. */
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ret = elf_filelen(loadinfo, filename);
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if (ret < 0)
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{
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berr("elf_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 = nx_open(filename, O_RDONLY);
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if (loadinfo->filfd < 0)
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{
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ret = loadinfo->filfd;
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berr("Failed to open ELF binary %s: %d\n", filename, ret);
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return ret;
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}
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/* Read the ELF ehdr from offset 0 */
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ret = elf_read(loadinfo, (FAR uint8_t *)&loadinfo->ehdr, sizeof(Elf32_Ehdr), 0);
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if (ret < 0)
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{
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berr("Failed to read ELF header: %d\n", ret);
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return ret;
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}
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elf_dumpbuffer("ELF header", (FAR const uint8_t *)&loadinfo->ehdr, sizeof(Elf32_Ehdr));
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/* Verify the ELF header */
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ret = elf_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 elf_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. elf_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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berr("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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