forked from Archive/PX4-Autopilot
264 lines
7.5 KiB
C
264 lines
7.5 KiB
C
/****************************************************************************
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* binfmt/libelf/libelf_load.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/types.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <elf32.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.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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#define ELF_ALIGN_MASK ((1 << CONFIG_ELF_ALIGN_LOG2) - 1)
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#define ELF_ALIGNUP(a) (((unsigned long)(a) + ELF_ALIGN_MASK) & ~ELF_ALIGN_MASK)
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#define ELF_ALIGNDOWN(a) ((unsigned long)(a) & ~ELF_ALIGN_MASK)
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#ifndef MAX
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#define MAX(x,y) ((x) > (y) ? (x) : (y))
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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_elfsize
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*
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* Description:
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* Calculate total memory allocation for 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 void elf_elfsize(struct elf_loadinfo_s *loadinfo)
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{
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size_t elfsize;
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int i;
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/* Accumulate the size each section into memory that is marked SHF_ALLOC */
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elfsize = 0;
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for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
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{
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FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
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/* SHF_ALLOC indicates that the section requires memory during
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* execution.
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*/
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if ((shdr->sh_flags & SHF_ALLOC) != 0)
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{
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elfsize += ELF_ALIGNUP(shdr->sh_size);
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}
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}
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/* Save the allocation size */
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loadinfo->elfsize = elfsize;
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}
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/****************************************************************************
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* Name: elf_loadfile
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*
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* Description:
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* Allocate memory for the file and read the section data into the
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* allocated memory. Section addresses in the shdr[] are updated to point
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* to the corresponding position in the allocated memory.
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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_loadfile(FAR struct elf_loadinfo_s *loadinfo)
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{
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FAR uint8_t *dest;
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int ret;
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int i;
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/* Allocate (and zero) memory for the ELF file. */
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loadinfo->elfalloc = (uintptr_t)kzalloc(loadinfo->elfsize);
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if (!loadinfo->elfalloc)
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{
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return -ENOMEM;
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}
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/* Read each section into memory that is marked SHF_ALLOC + SHT_NOBITS */
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bvdbg("Loaded sections:\n");
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dest = (FAR uint8_t*)loadinfo->elfalloc;
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for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
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{
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FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
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/* SHF_ALLOC indicates that the section requires memory during
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* execution */
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if ((shdr->sh_flags & SHF_ALLOC) == 0)
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{
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continue;
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}
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/* SHT_NOBITS indicates that there is no data in the file for the
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* section.
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*/
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if (shdr->sh_type != SHT_NOBITS)
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{
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/* Read the section data from sh_offset to dest */
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ret = elf_read(loadinfo, dest, shdr->sh_size, shdr->sh_offset);
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if (ret < 0)
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{
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bdbg("Failed to read section %d: %d\n", i, ret);
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return ret;
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}
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}
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/* Update sh_addr to point to copy in memory */
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bvdbg("%d. %08x->%08x\n", i, (long)shdr->sh_addr, (long)dest);
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shdr->sh_addr = (uintptr_t)dest;
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/* Setup the memory pointer for the next time through the loop */
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dest += ELF_ALIGNUP(shdr->sh_size);
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}
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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_load
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*
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* Description:
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* Loads the binary into memory, allocating memory, performing relocations
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* and inializing the data and bss segments.
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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_load(FAR struct elf_loadinfo_s *loadinfo)
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{
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int ret;
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bvdbg("loadinfo: %p\n", loadinfo);
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DEBUGASSERT(loadinfo && loadinfo->filfd >= 0);
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/* Load section headers into memory */
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ret = elf_loadshdrs(loadinfo);
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if (ret < 0)
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{
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bdbg("elf_loadshdrs failed: %d\n", ret);
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goto errout_with_buffers;
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}
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/* Determine total size to allocate */
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elf_elfsize(loadinfo);
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/* Allocate memory and load sections into memory */
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ret = elf_loadfile(loadinfo);
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if (ret < 0)
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{
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bdbg("elf_loadfile failed: %d\n", ret);
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goto errout_with_buffers;
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}
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/* Load static constructors and destructors. */
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#ifdef CONFIG_BINFMT_CONSTRUCTORS
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ret = elf_loadctors(loadinfo);
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if (ret < 0)
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{
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bdbg("elf_loadctors failed: %d\n", ret);
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goto errout_with_buffers;
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}
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ret = elf_loaddtors(loadinfo);
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if (ret < 0)
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{
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bdbg("elf_loaddtors failed: %d\n", ret);
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goto errout_with_buffers;
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}
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#endif
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return OK;
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/* Error exits */
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errout_with_buffers:
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elf_unload(loadinfo);
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return ret;
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}
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