193 lines
6.3 KiB
C
193 lines
6.3 KiB
C
/**
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* \addtogroup loader
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* @{
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*/
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/**
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* \defgroup elfloader The Contiki ELF loader
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*
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* The Contiki ELF loader links, relocates, and loads ELF
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* (Executable Linkable Format) object files into a running Contiki
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* system.
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*
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* ELF is a standard format for relocatable object code and executable
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* files. ELF is the standard program format for Linux, Solaris, and
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* other operating systems.
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*
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* An ELF file contains either a standalone executable program or a
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* program module. The file contains both the program code, the
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* program data, as well as information about how to link, relocate,
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* and load the program into a running system.
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*
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* The ELF file is composed of a set of sections. The sections contain
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* program code, data, or relocation information, but can also contain
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* debugging information.
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*
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* To link and relocate an ELF file, the Contiki ELF loader first
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* parses the ELF file structure to find the appropriate ELF
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* sections. It then allocates memory for the program code and data in
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* ROM and RAM, respectively. After allocating memory, the Contiki ELF
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* loader starts relocating the code found in the ELF file.
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*
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* @{
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*/
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/**
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* \file
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* Header file for the Contiki ELF loader.
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* \author
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* Adam Dunkels <adam@sics.se>
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*
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*/
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/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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#ifndef __ELFLOADER_H__
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#define __ELFLOADER_H__
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#include "cfs/cfs.h"
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/**
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* Return value from elfloader_load() indicating that loading worked.
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*/
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#define ELFLOADER_OK 0
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/**
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* Return value from elfloader_load() indicating that the ELF file had
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* a bad header.
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*/
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#define ELFLOADER_BAD_ELF_HEADER 1
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/**
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* Return value from elfloader_load() indicating that no symbol table
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* could be found in the ELF file.
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*/
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#define ELFLOADER_NO_SYMTAB 2
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/**
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* Return value from elfloader_load() indicating that no string table
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* could be found in the ELF file.
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*/
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#define ELFLOADER_NO_STRTAB 3
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/**
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* Return value from elfloader_load() indicating that the size of the
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* .text segment was zero.
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*/
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#define ELFLOADER_NO_TEXT 4
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/**
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* Return value from elfloader_load() indicating that a symbol
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* specific symbol could not be found.
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*
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* If this value is returned from elfloader_load(), the symbol has
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* been copied into the elfloader_unknown[] array.
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*/
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#define ELFLOADER_SYMBOL_NOT_FOUND 5
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/**
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* Return value from elfloader_load() indicating that one of the
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* required segments (.data, .bss, or .text) could not be found.
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*/
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#define ELFLOADER_SEGMENT_NOT_FOUND 6
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/**
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* Return value from elfloader_load() indicating that no starting
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* point could be found in the loaded module.
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*/
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#define ELFLOADER_NO_STARTPOINT 7
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/**
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* elfloader initialization function.
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*
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* This function should be called at boot up to initialize the elfloader.
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*/
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void elfloader_init(void);
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/**
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* \brief Load and relocate an ELF file.
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* \param fd An open CFS file descriptor.
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* \return ELFLOADER_OK if loading and relocation worked.
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* Otherwise an error value.
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*
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* This function loads and relocates an ELF file. The ELF
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* file must have been opened with cfs_open() prior to
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* calling this function.
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*
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* If the function is able to load the ELF file, a pointer
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* to the process structure in the model is stored in the
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* elfloader_loaded_process variable.
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*
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* \note This function modifies the ELF file opened with cfs_open()!
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* If the contents of the file is required to be intact,
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* the file must be backed up first.
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*
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*/
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int elfloader_load(int fd);
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/**
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* A pointer to the processes loaded with elfloader_load().
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*/
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extern struct process * const * elfloader_autostart_processes;
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/**
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* If elfloader_load() could not find a specific symbol, it is copied
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* into this array.
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*/
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extern char elfloader_unknown[30];
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#ifndef ELFLOADER_DATAMEMORY_SIZE
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#ifdef ELFLOADER_CONF_DATAMEMORY_SIZE
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#define ELFLOADER_DATAMEMORY_SIZE ELFLOADER_CONF_DATAMEMORY_SIZE
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#else
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#define ELFLOADER_DATAMEMORY_SIZE 0x100
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#endif
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#endif /* ELFLOADER_DATAMEMORY_SIZE */
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#ifndef ELFLOADER_TEXTMEMORY_SIZE
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#ifdef ELFLOADER_CONF_TEXTMEMORY_SIZE
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#define ELFLOADER_TEXTMEMORY_SIZE ELFLOADER_CONF_TEXTMEMORY_SIZE
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#else
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#define ELFLOADER_TEXTMEMORY_SIZE 0x100
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#endif
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#endif /* ELFLOADER_TEXTMEMORY_SIZE */
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typedef unsigned long elf32_word;
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typedef signed long elf32_sword;
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typedef unsigned short elf32_half;
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typedef unsigned long elf32_off;
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typedef unsigned long elf32_addr;
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struct elf32_rela {
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elf32_addr r_offset; /* Location to be relocated. */
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elf32_word r_info; /* Relocation type and symbol index. */
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elf32_sword r_addend; /* Addend. */
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};
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#endif /* __ELFLOADER_H__ */
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/** @} */
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/** @} */
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