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