nes-proj/core/loader/elfloader_compat.c

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/*
* Copyright (c) 2006, 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.
*
* @(#)$Id: elfloader_compat.c,v 1.2 2006/12/20 13:38:33 bg- Exp $
*/
/*
* This code is plug-in compatible with elfloader.c and is an example
* of how the Contiki dynamic Link Editor (CLE) can be used.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/unistd.h>
#include "contiki.h"
#include "loader/elfloader_compat.h"
#include "loader/cle.h"
#include "lib/malloc.h"
#include "dev/rom.h"
#include "dev/xmem.h"
#define NDEBUG
#include "lib/assert.h"
#ifdef NDEBUG
#define PRINTF(...) do {} while (0)
#else
#define PRINTF(...) printf(__VA_ARGS__)
#endif
struct process *elfloader_loaded_process;
void (*elfloader_fini)(void);
#define IMAX(a, b) (((a) > (b)) ? (a) : (b))
static cle_addr datamemory;
#define TEXTMEMORY \
(cle_addr)(((uintptr_t)(&_etext + 1) \
+ (uintptr_t)&_edata - (uintptr_t)&__data_start \
+ ROM_ERASE_UNIT_SIZE) \
& ~(ROM_ERASE_UNIT_SIZE - 1))
char elfloader_unknown[30]; /* Name that caused link error. */
/*---------------------------------------------------------------------------*/
int
elfloader_load(off_t eepromaddr)
{
struct cle_info h;
int ret;
void (*elfloader_init)(void);
elfloader_unknown[0] = 0;
/* The ELF header is located at the start of the buffer. */
ret = cle_read_info(&h, xmem_pread, eepromaddr);
if(ret != ELFLOADER_OK) {
memcpy(elfloader_unknown, h.name, sizeof(elfloader_unknown));
elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
return ret;
}
if(datamemory != NULL) {
free(datamemory);
}
/* We are making semi-permanent allocations, first compact heap! */
malloc_compact();
datamemory = malloc(IMAX(h.textsize, h.datasize + h.bsssize));
if(datamemory == NULL) {
return ELFLOADER_DATA_TO_LARGE; /* XXX or text to large */
}
h.data = datamemory;
h.bss = h.data + h.datasize;
h.text = TEXTMEMORY;
PRINTF("elfloader: copy text segment to RAM %p %p\n",
h.data, h.data + h.textsize);
ret = xmem_pread(datamemory, h.textsize, eepromaddr + h.textoff);
assert(ret > 0);
if(h.textrelasize > 0) {
PRINTF("elfloader: relocate text in RAM\n");
ret = cle_relocate(&h,
xmem_pread,
eepromaddr,
datamemory,
h.textrelaoff, h.textrelasize);
if(ret != ELFLOADER_OK) {
memcpy(elfloader_unknown, h.name, sizeof(elfloader_unknown));
elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
return ret;
}
}
PRINTF("elfloader: copy text segment to ROM %p %p\n",
h.text, h.text + h.textsize);
ret = rom_erase((h.textsize+ROM_ERASE_UNIT_SIZE) & ~(ROM_ERASE_UNIT_SIZE-1),
(uintptr_t)h.text);
assert(ret > 0);
ret = rom_pwrite(datamemory, h.textsize, (uintptr_t)h.text);
assert(ret > 0);
PRINTF("elfloader: copy data segment to RAM %p %p\n",
h.data, h.data + h.datasize);
ret = xmem_pread(datamemory, h.datasize, eepromaddr + h.dataoff);
assert(ret > 0);
if(h.datarelasize > 0) {
PRINTF("elfloader: relocate data segment\n");
ret = cle_relocate(&h,
xmem_pread,
eepromaddr,
datamemory,
h.datarelaoff, h.datarelasize);
if(ret != ELFLOADER_OK) {
memcpy(elfloader_unknown, h.name, sizeof(elfloader_unknown));
elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
return ret;
}
}
PRINTF("elfloader: zero bss %p %p\n", h.bss, h.bss + h.bsssize);
memset(h.bss, 0, h.bsssize);
/* Find _init, _fini, and loaded_process. */
elfloader_loaded_process = cle_lookup(&h, xmem_pread, eepromaddr,
"process_load");
elfloader_fini = cle_lookup(&h, xmem_pread, eepromaddr, "_fini");
elfloader_init = cle_lookup(&h, xmem_pread, eepromaddr, "_init");
if(elfloader_init != NULL) {
PRINTF("init=%p fini=%p\n", elfloader_init, elfloader_fini);
(*elfloader_init)();
elfloader_loaded_process = NULL;
return ELFLOADER_OK;
}
if(elfloader_loaded_process != NULL) {
PRINTF("elfloader: launch program\n");
process_start(elfloader_loaded_process, NULL);
elfloader_fini = NULL;
return ELFLOADER_OK;
} else {
return ELFLOADER_NO_STARTPOINT;
}
}
/*---------------------------------------------------------------------------*/
void
elfloader_unload(void)
{
if(elfloader_fini != NULL) {
(*elfloader_fini)();
elfloader_fini = NULL;
} else if(elfloader_loaded_process != NULL) {
process_exit(elfloader_loaded_process);
elfloader_loaded_process = NULL;
}
if(datamemory != NULL) {
free(datamemory);
datamemory = NULL;
}
}