107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
/*
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* Copyright (c) 2007, Takahide Matsutsuka.
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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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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* mef.c
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* The Micro Executable Format
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* \author
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* Takahide Matsutsuka <markn@markn.org>
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*/
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#ifdef WITH_LOADER_ARCH
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#include "contiki.h"
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#include "loader/mef.h"
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struct Area areas[MEF_AREA_MAX];
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void
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mef_load(unsigned char* offset)
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{
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unsigned char* start = offset;
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unsigned char areasize = load_byte();
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uint16_t relocsize;
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unsigned int i, j;
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uint16_t checksum = 0;
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unsigned char* buf;
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struct Relocation reloc;
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for (i = 0; i < areasize; i++) {
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buf = (unsigned char *) &areas[i];
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for (j = 0; j < sizeof(struct Area); j++) {
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*buf++ = load_byte();
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}
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}
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for (i = 0; i < areasize; i++) {
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for (j = 0; j < areas[i].size; j++) {
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*offset = load_byte();
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checksum += *offset;
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offset++;
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}
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if (areas[i].checksum != checksum) {
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// Checksum error!
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}
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}
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// relocation information
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relocsize = load_byte();
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relocsize = (load_byte() << 8) + relocsize;
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for (i = 0; i < relocsize; i++) {
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buf = (unsigned char *) &reloc;
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for (j = 0; j < sizeof(struct Relocation); j++) {
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*buf++ = load_byte();
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}
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mef_reloc(start, &reloc);
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}
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}
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void
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mef_reloc(unsigned char* offset, struct Relocation *reloc)
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{
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if (reloc->mode & MEF_RELOC_ABSOLUTE) {
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return;
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}
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offset += reloc->address;
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if (reloc->mode & MEF_RELOC_MSB_BYTE) {
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*offset = (unsigned char) ((reloc->data + (uint16_t) offset) >> 8);
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} else if (reloc->mode & MEF_RELOC_LSB_BYTE) {
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*offset = (unsigned char) ((reloc->data + (uint16_t) offset) & 0xff);
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} else { /* word */
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*offset++ = (unsigned char) ((reloc->data + (uint16_t) offset) & 0xff);
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*offset = (unsigned char) ((reloc->data + (uint16_t) offset) >> 8);
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}
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}
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#endif /* WITH_LOADER_ARCH */
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