view miscutil/mokosrec2bin.c @ 1012:11391cb6bdc0

patch from fixeria: doc change from SE K2x0 to K2xx Since their discovery in late 2022, Sony Ericsson K200 and K220 phones were collectively referred to as SE K2x0 in FreeCalypso documentation. However, now that SE K205 has been discovered as yet another member of the same family (same PCBA in different case), it makes more sense to refer to the whole family as SE K2xx.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 23 Sep 2024 12:23:20 +0000
parents d00ffedacab5
children
line wrap: on
line source

/*
 * GSM device firmwares that are built with TI's TMS470 toolchain in TI's
 * canonical way come out in TI's *.m0 format produced by TI's hex470 tool.
 * TI's *.m0 is a variant of the classic S-record format from Motorola,
 * but the specific variant depends on the -memwidth and -romwidth options
 * with which the hex470 tool is run.
 *
 * In TI's canonical architecture (as opposed to Mot/Compal's heavily modified
 * version) this hex470 tool is run with -memwidth 16 -romwidth 16 options,
 * and the *.m0 file comes out in the format variant which we have nicknamed
 * "moko-style" after its most famous user.  This variant is a byte-reversed
 * S-record format in that each 16-bit word is byte-reversed relative to the
 * native byte order of the ARM7 processor.  (This strange byte order actually
 * makes some sense if one views the image as a long array of 16-bit hex
 * values; 16 bits is the width of the flash memory on Calypso GSM devices and
 * thus the natural unit size for flash programming.)
 *
 * The present mokosrec2bin utility converts these "moko-style" S-record files
 * to straight binary, a conversion that includes flipping the order of bytes.
 */

#include <sys/types.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>

char *infname;
FILE *inf, *outf;
u_char fillbyte;
char srecbuf[80];
u_char srecbin[40];
int lineno, state;
u_long lastaddr;

u_char header[6] = {0x06, 0x00, 0x00, 'H', 'D', 'R'};

decode_hex_byte(s)
	char *s;
{
	register int u, l;

	if (!isxdigit(s[0]) || !isxdigit(s[1]))
		return(-1);
	if (isdigit(s[0]))
		u = s[0] - '0';
	else if (isupper(s[0]))
		u = s[0] - 'A' + 10;
	else
		u = s[0] - 'a' + 10;
	if (isdigit(s[1]))
		l = s[1] - '0';
	else if (isupper(s[1]))
		l = s[1] - 'A' + 10;
	else
		l = s[1] - 'a' + 10;
	return((u << 4) | l);
}

srec2bin()
{
	register int i, l, b;

	l = decode_hex_byte(srecbuf + 2);
	if (l < 1) {
		fprintf(stderr, "%s line %d: S-record length octet is bad\n",
			infname, lineno);
		exit(1);
	}
	srecbin[0] = l;
	if (l > 35) {
		fprintf(stderr,
			"%s line %d: S-record is longer than expected\n",
			infname, lineno);
		exit(1);
	}
	for (i = 1; i <= l; i++) {
		b = decode_hex_byte(srecbuf + i*2 + 2);
		if (b < 0) {
			fprintf(stderr, "%s line %d: hex decode error\n",
				infname, lineno);
			exit(1);
		}
		srecbin[i] = b;
	}
	return(0);
}

srec_cksum()
{
	u_char accum;
	register int i, len;

	len = srecbin[0] + 1;
	accum = 0;
	for (i = 0; i < len; i++)
		accum += srecbin[i];
	if (accum != 0xFF) {
		fprintf(stderr, "%s line %d: bad checksum\n", infname, lineno);
		exit(1);
	}
	return(0);
}

main(argc, argv)
	char **argv;
{
	register int i;
	u_long curaddr;
	int datalen;

	if (argc < 3 || argc > 4) {
usage:		fprintf(stderr, "usage: %s input.m0 output.bin [fill-byte]\n",
			argv[0]);
		exit(1);
	}
	infname = argv[1];
	inf = fopen(infname, "r");
	if (!inf) {
		perror(infname);
		exit(1);
	}
	if (argc > 3) {
		i = decode_hex_byte(argv[3]);
		if (i >= 0)
			fillbyte = i;
		else
			goto usage;
	} else
		fillbyte = 0xFF;

	state = 0;
	for (lineno = 1; ; lineno++) {
		if (!fgets(srecbuf, sizeof srecbuf, inf)) {
			fprintf(stderr, "%s: premature EOF\n", infname);
			exit(1);
		}
		if (srecbuf[0] != 'S') {
			fprintf(stderr, "%s line %d: not an S-record\n",
				infname, lineno);
			exit(1);
		}
		switch (srecbuf[1]) {
		case '0':
			if (state == 0)
				break;
			else
				goto badtype;
		case '3':
			if (state == 0)
				goto badtype;
			else
				break;
		case '7':
			if (state == 2)
				break;
			else
				goto badtype;
		default:
		badtype:
			fprintf(stderr,
				"%s line %d: S-record type unexpected\n",
				infname, lineno);
			exit(1);
		}
		srec2bin();
		srec_cksum();
		if (state == 0) {
			if (bcmp(srecbin, header, 6)) {
				fprintf(stderr, "%s: expected header missing\n",
					infname);
				exit(1);
			}
			state = 1;
			continue;
		}
		switch (srecbuf[1]) {
		case '3':
			if (srecbin[0] < 6) {
				fprintf(stderr,
					"%s line %d: S3 record is too short\n",
					infname, lineno);
				exit(1);
			}
			curaddr = (srecbin[1] << 24) | (srecbin[2] << 16) |
				  (srecbin[3] << 8) | srecbin[4];
			if (curaddr & 1) {
				fprintf(stderr, "%s line %d: odd address\n",
					infname, lineno);
				exit(1);
			}
			datalen = srecbin[0] - 5;
			if (datalen & 1) {
				fprintf(stderr, "%s line %d: odd data length\n",
					infname, lineno);
				exit(1);
			}
			if (state < 2) {
				outf = fopen(argv[2], "w");
				if (!outf) {
					perror(argv[2]);
					exit(1);
				}
				state = 2;
				lastaddr = 0;
			}
			if (curaddr < lastaddr) {
				fprintf(stderr,
					"%s line %d: address going backwards\n",
					infname, lineno);
				exit(1);
			}
			while (lastaddr < curaddr) {
				putc(fillbyte, outf);
				lastaddr++;
			}
			for (i = 0; i < datalen; i += 2) {
				putc(srecbin[i + 6], outf);
				putc(srecbin[i + 5], outf);
			}
			lastaddr = curaddr + datalen;
			continue;
		case '7':
			fclose(outf);
			exit(0);
		default:
			abort();
		}
	}
}