osd-contiki/core/loader/elfloader-arch.h

140 lines
5.5 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.
*
*/
/**
* \addtogroup elfloader
* @{
*/
/**
* \defgroup elfloaderarch Architecture specific functionality for the ELF loader.
*
* The architecture specific functionality for the Contiki ELF loader
* has to be implemented for each processor type Contiki runs on.
*
* Since the ELF format is slightly different for different processor
* types, the Contiki ELF loader is divided into two parts: the
* generic ELF loader module (\ref elfloader) and the architecture
* specific part (this module). The architecture specific part deals
* with memory allocation, code and data relocation, and writing the
* relocated ELF code into program memory.
*
* To port the Contiki ELF loader to a new processor type, this module
* has to be implemented for the new processor type.
*
* @{
*/
/**
* \file
* Header file for the architecture specific parts of the Contiki ELF loader.
*
* \author
* Adam Dunkels <adam@sics.se>
*
*/
#ifndef __ELFLOADER_ARCH_H__
#define __ELFLOADER_ARCH_H__
#include "loader/elfloader.h"
/**
* \brief Allocate RAM for a new module.
* \param size The size of the requested memory.
* \return A pointer to the allocated RAM
*
* This function is called from the Contiki ELF loader to
* allocate RAM for the module to be loaded into.
*
* \bug The Contiki ELF loader currently does not contain a
* mechanism for deallocating the memory allocated with
* this function.
*/
void *elfloader_arch_allocate_ram(int size);
/**
* \brief Allocate program memory for a new module.
* \param size The size of the requested memory.
* \return A pointer to the allocated program memory
*
* This function is called from the Contiki ELF loader to
* allocate program memory (typically ROM) for the module
* to be loaded into.
*
* \bug The Contiki ELF loader currently does not contain a
* mechanism for deallocating the memory allocated with
* this function.
*/
void *elfloader_arch_allocate_rom(int size);
/**
* \brief Perform a relocation.
* \param fd The file descriptor for the ELF file.
* \param sectionoffset The file offset at which the relocation can be found.
* \param sectionaddr The section start address (absolute runtime).
* \param rela A pointer to an ELF32 rela structure (struct elf32_rela).
* \param addr The relocated address.
*
* This function is called from the Contiki ELF loader to
* perform a relocation on a piece of code or data. The
* relocated address is calculated by the Contiki ELF
* loader, based on information in the ELF file, and it is
* the responsibility of this function to patch the
* executable code. The Contiki ELF loader passes a
* pointer to an ELF32 rela structure (struct elf32_rela)
* that contains information about how to patch the
* code. This information is different from processor to
* processor.
*/
void elfloader_arch_relocate(int fd, unsigned int sectionoffset,
char *sectionaddr,
struct elf32_rela *rela, char *addr);
/**
* \brief Write to read-only memory (for example the text segment).
* \param fd The file descriptor for the ELF file.
* \param textoff Offset of text segment relative start of file.
* \param size The size of the text segment.
* \param mem A pointer to the where the text segment should be flashed
*
* This function is called from the Contiki ELF loader to
* write the program code (text segment) of a loaded
* module into memory. The function is called when all
* relocations have been performed.
*/
void elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem);
#endif /* __ELFLOADER_ARCH_H__ */
/** @} */
/** @} */