195 lines
6.3 KiB
C
195 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 2005, Swedish Institute of Computer Science
|
|
* All rights reserved.
|
|
*
|
|
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Header file for the Contiki ELF loader.
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \addtogroup loader
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \defgroup elfloader The Contiki ELF loader
|
|
*
|
|
* The Contiki ELF loader links, relocates, and loads ELF
|
|
* (Executable Linkable Format) object files into a running Contiki
|
|
* system.
|
|
*
|
|
* ELF is a standard format for relocatable object code and executable
|
|
* files. ELF is the standard program format for Linux, Solaris, and
|
|
* other operating systems.
|
|
*
|
|
* An ELF file contains either a standalone executable program or a
|
|
* program module. The file contains both the program code, the
|
|
* program data, as well as information about how to link, relocate,
|
|
* and load the program into a running system.
|
|
*
|
|
* The ELF file is composed of a set of sections. The sections contain
|
|
* program code, data, or relocation information, but can also contain
|
|
* debugging information.
|
|
*
|
|
* To link and relocate an ELF file, the Contiki ELF loader first
|
|
* parses the ELF file structure to find the appropriate ELF
|
|
* sections. It then allocates memory for the program code and data in
|
|
* ROM and RAM, respectively. After allocating memory, the Contiki ELF
|
|
* loader starts relocating the code found in the ELF file.
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
#ifndef ELFLOADER_H_
|
|
#define ELFLOADER_H_
|
|
|
|
#include "cfs/cfs.h"
|
|
|
|
/**
|
|
* Return value from elfloader_load() indicating that loading worked.
|
|
*/
|
|
#define ELFLOADER_OK 0
|
|
/**
|
|
* Return value from elfloader_load() indicating that the ELF file had
|
|
* a bad header.
|
|
*/
|
|
#define ELFLOADER_BAD_ELF_HEADER 1
|
|
/**
|
|
* Return value from elfloader_load() indicating that no symbol table
|
|
* could be found in the ELF file.
|
|
*/
|
|
#define ELFLOADER_NO_SYMTAB 2
|
|
/**
|
|
* Return value from elfloader_load() indicating that no string table
|
|
* could be found in the ELF file.
|
|
*/
|
|
#define ELFLOADER_NO_STRTAB 3
|
|
/**
|
|
* Return value from elfloader_load() indicating that the size of the
|
|
* .text segment was zero.
|
|
*/
|
|
#define ELFLOADER_NO_TEXT 4
|
|
/**
|
|
* Return value from elfloader_load() indicating that a symbol
|
|
* specific symbol could not be found.
|
|
*
|
|
* If this value is returned from elfloader_load(), the symbol has
|
|
* been copied into the elfloader_unknown[] array.
|
|
*/
|
|
#define ELFLOADER_SYMBOL_NOT_FOUND 5
|
|
/**
|
|
* Return value from elfloader_load() indicating that one of the
|
|
* required segments (.data, .bss, or .text) could not be found.
|
|
*/
|
|
#define ELFLOADER_SEGMENT_NOT_FOUND 6
|
|
/**
|
|
* Return value from elfloader_load() indicating that no starting
|
|
* point could be found in the loaded module.
|
|
*/
|
|
#define ELFLOADER_NO_STARTPOINT 7
|
|
|
|
/**
|
|
* elfloader initialization function.
|
|
*
|
|
* This function should be called at boot up to initialize the elfloader.
|
|
*/
|
|
void elfloader_init(void);
|
|
|
|
/**
|
|
* \brief Load and relocate an ELF file.
|
|
* \param fd An open CFS file descriptor.
|
|
* \return ELFLOADER_OK if loading and relocation worked.
|
|
* Otherwise an error value.
|
|
*
|
|
* This function loads and relocates an ELF file. The ELF
|
|
* file must have been opened with cfs_open() prior to
|
|
* calling this function.
|
|
*
|
|
* If the function is able to load the ELF file, a pointer
|
|
* to the process structure in the model is stored in the
|
|
* elfloader_loaded_process variable.
|
|
*
|
|
* \note This function modifies the ELF file opened with cfs_open()!
|
|
* If the contents of the file is required to be intact,
|
|
* the file must be backed up first.
|
|
*
|
|
*/
|
|
int elfloader_load(int fd);
|
|
|
|
/**
|
|
* A pointer to the processes loaded with elfloader_load().
|
|
*/
|
|
extern struct process * const * elfloader_autostart_processes;
|
|
|
|
/**
|
|
* If elfloader_load() could not find a specific symbol, it is copied
|
|
* into this array.
|
|
*/
|
|
extern char elfloader_unknown[30];
|
|
|
|
#ifndef ELFLOADER_DATAMEMORY_SIZE
|
|
#ifdef ELFLOADER_CONF_DATAMEMORY_SIZE
|
|
#define ELFLOADER_DATAMEMORY_SIZE ELFLOADER_CONF_DATAMEMORY_SIZE
|
|
#else
|
|
#define ELFLOADER_DATAMEMORY_SIZE 0x100
|
|
#endif
|
|
#endif /* ELFLOADER_DATAMEMORY_SIZE */
|
|
|
|
#ifndef ELFLOADER_TEXTMEMORY_SIZE
|
|
#ifdef ELFLOADER_CONF_TEXTMEMORY_SIZE
|
|
#define ELFLOADER_TEXTMEMORY_SIZE ELFLOADER_CONF_TEXTMEMORY_SIZE
|
|
#else
|
|
#define ELFLOADER_TEXTMEMORY_SIZE 0x100
|
|
#endif
|
|
#endif /* ELFLOADER_TEXTMEMORY_SIZE */
|
|
|
|
typedef unsigned long elf32_word;
|
|
typedef signed long elf32_sword;
|
|
typedef unsigned short elf32_half;
|
|
typedef unsigned long elf32_off;
|
|
typedef unsigned long elf32_addr;
|
|
|
|
struct elf32_rela {
|
|
elf32_addr r_offset; /* Location to be relocated. */
|
|
elf32_word r_info; /* Relocation type and symbol index. */
|
|
elf32_sword r_addend; /* Addend. */
|
|
};
|
|
|
|
|
|
#endif /* ELFLOADER_H_ */
|
|
|
|
/** @} */
|
|
/** @} */
|