mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-24 07:29:42 +00:00
108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2007, Takahide Matsutsuka.
|
|
* 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. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
*
|
|
* $Id: mef.c,v 1.1 2007/11/28 06:13:24 matsutsuka Exp $
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* \file
|
|
* mef.c
|
|
* The Micro Executable Format
|
|
* \author
|
|
* Takahide Matsutsuka <markn@markn.org>
|
|
*/
|
|
|
|
#ifdef WITH_LOADER_ARCH
|
|
#include "contiki.h"
|
|
#include "loader/mef.h"
|
|
|
|
struct Area areas[MEF_AREA_MAX];
|
|
|
|
void
|
|
mef_load(unsigned char* offset)
|
|
{
|
|
unsigned char* start = offset;
|
|
unsigned char areasize = load_byte();
|
|
u16_t relocsize;
|
|
unsigned int i, j;
|
|
u16_t checksum = 0;
|
|
unsigned char* buf;
|
|
struct Relocation reloc;
|
|
|
|
for (i = 0; i < areasize; i++) {
|
|
buf = (unsigned char *) &areas[i];
|
|
for (j = 0; j < sizeof(struct Area); j++) {
|
|
*buf++ = load_byte();
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < areasize; i++) {
|
|
for (j = 0; j < areas[i].size; j++) {
|
|
*offset = load_byte();
|
|
checksum += *offset;
|
|
offset++;
|
|
}
|
|
if (areas[i].checksum != checksum) {
|
|
// Checksum error!
|
|
}
|
|
}
|
|
|
|
// relocation information
|
|
relocsize = load_byte();
|
|
relocsize = (load_byte() << 8) + relocsize;
|
|
for (i = 0; i < relocsize; i++) {
|
|
buf = (unsigned char *) &reloc;
|
|
for (j = 0; j < sizeof(struct Relocation); j++) {
|
|
*buf++ = load_byte();
|
|
}
|
|
mef_reloc(start, &reloc);
|
|
}
|
|
}
|
|
|
|
void
|
|
mef_reloc(unsigned char* offset, struct Relocation *reloc)
|
|
{
|
|
if (reloc->mode & MEF_RELOC_ABSOLUTE) {
|
|
return;
|
|
}
|
|
offset += reloc->address;
|
|
if (reloc->mode & MEF_RELOC_MSB_BYTE) {
|
|
*offset = (unsigned char) ((reloc->data + (u16_t) offset) >> 8);
|
|
} else if (reloc->mode & MEF_RELOC_LSB_BYTE) {
|
|
*offset = (unsigned char) ((reloc->data + (u16_t) offset) & 0xff);
|
|
} else { /* word */
|
|
*offset++ = (unsigned char) ((reloc->data + (u16_t) offset) & 0xff);
|
|
*offset = (unsigned char) ((reloc->data + (u16_t) offset) >> 8);
|
|
}
|
|
}
|
|
|
|
|
|
#endif /* WITH_LOADER_ARCH */
|