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/****************************************************************************
* binfmt/libelf/libelf_load.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <elf.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/binfmt/elf.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
#ifndef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
#endif
/****************************************************************************
* Private Constant Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: elf_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 elf_filelen(FAR struct elf_loadinfo_s *loadinfo)
{
struct stat buf;
int ret;
/* Get the file stats */
ret = fstat(loadinfo->filfd, &buf);
if (ret < 0)
{
int errval = errno;
bdbg("Failed to fstat file: %d\n", errval);
return -errval;
}
/* Verify that it is a regular file */
if (!S_ISREG(buf.st_mode))
{
bdbg("Not a regular file. mode: %d\n", buf.st_mode);
return -errval;
}
/* TODO: Verify that the file is readable */
/* Return the size of the file in the loadinfo structure */
loadinfo->filelen = buf.st_size;
return OK;
}
/****************************************************************************
* Name: elf_loadshdrs
*
* Description:
* Loads section headers into memory.
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
static inline int elf_loadshdrs(FAR struct elf_loadinfo_s *loadinfo)
{
size_t shdrsize;
ssize_t bytesread;
uint8_t buffer;
off_t offset;
int ret;
DEBUGASSERT(loadinfo->shdrs == NULL);
/* Verify that there are sections */
if (loadinfo->e_shum < 1)
{
bdbg("No section(?)\n");
return -EINVAL;
}
/* Get the total size of the section header table */
shdrsize = (size_t)loadinfo->ehdr.e_shentsize * (size_t)loadinfo->e_shum;
if(loadinfo->e_shoff + shdrsize > loadinfo->filelen)
{
bdbg("Insufficent space in file for section header table\n");
return -ESPIPE;
}
/* Allocate memory to hold a working copy of the sector header table */
loadinfo->shdrs = (FAR Elf32_Shdr*)kmalloc(shdrsize);
if (!loadinfo->shdrs)
{
bdbg("Failed to allocate the section header table. Size: %ld\n", (long)shdrsize);
return -ENOMEM;
}
/* Seek to the start of the section header table */
offset = lseek(loadinfo->filfd, loadinfo->e_shoff, SEEK_SET);
if (offset == (off_t)-1)
{
int errval = errno;
bdbg("See to %ld failed: %d\n", (long)loadinfo->e_shoff, errval);
ret = -errval;
goto errout_with_alloc;
}
/* Now load the section header table into the allocated memory */
buffer = loadinfo->shdrs;
while (shdrsize > 0)
{
bytesread = read(loadinfo->filfd, buffer, shdrsize);
if (bytes < 0)
{
int errval = errno;
/* EINTR just means that we received a signal */
if (errno != EINTR)
{
bdbg("read() failed: %d\n", errval);
ret = -errval;
goto errout_with_alloc;
}
}
else if (bytes == 0)
{
bdbg("Unexpectged end of file\n");
ret = -ENODATA;
goto errout_with_alloc;
}
else
{
buffer += bytesread;
shdrsize -= bytesread;
}
}
return OK;
errout_with_alloc:
kfree(loadinfo->shdrs);
loadinfo->shdrs = 0;
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: elf_load
*
* Description:
* Loads the binary into memory, allocating memory, performing relocations
* and inializing the data and bss segments.
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int elf_load(FAR struct elf_loadinfo_s *loadinfo)
{
# warning "Missing logic"
return -ENOSYS;
}
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