* Backwards compatible with elfloader.c but uses the new Contiki
link-editor. Taken together cle and elfloader_compat requires less ROM and RAM than the old version.
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core/loader/elfloader_compat.c
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196
core/loader/elfloader_compat.c
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/*
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* Copyright (c) 2006, 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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* @(#)$Id: elfloader_compat.c,v 1.1 2006/12/01 15:15:08 bg- Exp $
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*/
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/*
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* This code is plug-in compatible with elfloader.c and is an example
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* of how the Contiki dynamic Link Editor (CLE) can be used.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/unistd.h>
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#include "contiki.h"
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#include "loader/elfloader.h"
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#include "loader/cle.h"
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#include "lib/malloc.h"
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#include "dev/rom.h"
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#include "dev/xmem.h"
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#define NDEBUG
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#include "lib/assert.h"
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#ifdef NDEBUG
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#define PRINTF(...) do {} while (0)
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#else
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#define PRINTF(...) printf(__VA_ARGS__)
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#endif
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struct process *elfloader_loaded_process;
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void (*elfloader_fini)(void);
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#define IMAX(a, b) (((a) > (b)) ? (a) : (b))
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static cle_addr datamemory;
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#define TEXTMEMORY \
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(cle_addr)(((uintptr_t)(&_etext + 1) \
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+ (uintptr_t)&_edata - (uintptr_t)&__data_start \
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+ ROM_ERASE_UNIT_SIZE) \
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& ~(ROM_ERASE_UNIT_SIZE - 1))
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char elfloader_unknown[30]; /* Name that caused link error. */
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/*---------------------------------------------------------------------------*/
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int
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elfloader_load(off_t eepromaddr)
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{
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struct cle_info h;
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int ret;
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void (*elfloader_init)(void);
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elfloader_unknown[0] = 0;
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/* The ELF header is located at the start of the buffer. */
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ret = cle_read_info(&h, xmem_pread, eepromaddr);
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if(ret != ELFLOADER_OK) {
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memcpy(elfloader_unknown, h.name, sizeof(elfloader_unknown));
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elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
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return ret;
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}
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if(datamemory != NULL) {
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free(datamemory);
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}
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/* We are making semi-permanent allocations, first compact heap! */
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malloc_compact();
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datamemory = malloc(IMAX(h.textsize, h.datasize + h.bsssize));
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if(datamemory == NULL) {
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return ELFLOADER_DATA_TO_LARGE; /* XXX or text to large */
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}
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h.data = datamemory;
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h.bss = h.data + h.datasize;
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h.text = TEXTMEMORY;
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PRINTF("elfloader: copy text segment to RAM %p %p\n",
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h.data, h.data + h.textsize);
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ret = xmem_pread(datamemory, h.textsize, eepromaddr + h.textoff);
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assert(ret > 0);
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if(h.textrelasize > 0) {
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PRINTF("elfloader: relocate text in RAM\n");
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ret = cle_relocate(&h,
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xmem_pread,
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eepromaddr,
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datamemory,
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h.textrelaoff, h.textrelasize);
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if(ret != ELFLOADER_OK) {
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memcpy(elfloader_unknown, h.name, sizeof(elfloader_unknown));
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elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
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return ret;
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}
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}
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PRINTF("elfloader: copy text segment to ROM %p %p\n",
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h.text, h.text + h.textsize);
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ret = rom_erase((h.textsize+ROM_ERASE_UNIT_SIZE) & ~(ROM_ERASE_UNIT_SIZE-1),
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(uintptr_t)h.text);
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assert(ret > 0);
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ret = rom_pwrite(datamemory, h.textsize, (uintptr_t)h.text);
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assert(ret > 0);
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PRINTF("elfloader: copy data segment to RAM %p %p\n",
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h.data, h.data + h.datasize);
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ret = xmem_pread(datamemory, h.datasize, eepromaddr + h.dataoff);
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assert(ret > 0);
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if(h.datarelasize > 0) {
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PRINTF("elfloader: relocate data segment\n");
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ret = cle_relocate(&h,
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xmem_pread,
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eepromaddr,
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datamemory,
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h.datarelaoff, h.datarelasize);
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if(ret != ELFLOADER_OK) {
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memcpy(elfloader_unknown, h.name, sizeof(elfloader_unknown));
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elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
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return ret;
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}
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}
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PRINTF("elfloader: zero bss %p %p\n", h.bss, h.bss + h.bsssize);
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memset(h.bss, 0, h.bsssize);
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/* Find _init, _fini, and loaded_process. */
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elfloader_loaded_process = cle_lookup(&h, xmem_pread, eepromaddr,
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"process_load");
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elfloader_fini = cle_lookup(&h, xmem_pread, eepromaddr, "_fini");
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elfloader_init = cle_lookup(&h, xmem_pread, eepromaddr, "_init");
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if(elfloader_init != NULL) {
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PRINTF("init=%p fini=%p\n", elfloader_init, elfloader_fini);
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(*elfloader_init)();
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elfloader_loaded_process = NULL;
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return ELFLOADER_OK;
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}
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if(elfloader_loaded_process != NULL) {
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PRINTF("elfloader: launch program\n");
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process_start(elfloader_loaded_process, NULL);
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elfloader_fini = NULL;
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return ELFLOADER_OK;
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} else {
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return ELFLOADER_NO_STARTPOINT;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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elfloader_unload(void)
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{
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if(elfloader_fini != NULL) {
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(*elfloader_fini)();
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elfloader_fini = NULL;
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} else if(elfloader_loaded_process != NULL) {
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process_exit(elfloader_loaded_process);
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elfloader_loaded_process = NULL;
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}
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if(datamemory != NULL) {
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free(datamemory);
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datamemory = NULL;
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}
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}
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