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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Dave Chapman
*
* Based on mkboot, Copyright (C) 2005 by Linus Nielsen Feltzing
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <inttypes.h>
#include "telechips.h"
/*
Append a Rockbox bootloader to a Telechips original firmware file.
The first instruction in a TCC firmware file is always of the form:
ldr pc, [pc, #xxx]
where [pc, #xxx] is the entry point of the firmware - e.g. 0x20000020
mktccboot appends the Rockbox bootloader to the end of the original
firmware image and replaces the contents of [pc, #xxx] with the entry
point of our bootloader - i.e. the length of the original firmware plus
0x20000000.
It then stores the original entry point from [pc, #xxx] in a fixed
offset in the Rockbox boootloader, which is used by the bootloader to
dual-boot.
Finally, mktccboot corrects the length and CRCs in the main firmware
header, creating a new legal firmware file which can be installed on
the device.
*/
/* win32 compatibility */
#ifndef O_BINARY
#define O_BINARY 0
#endif
static void put_uint32le(uint32_t x, unsigned char* p)
{
p[0] = x & 0xff;
p[1] = (x >> 8) & 0xff;
p[2] = (x >> 16) & 0xff;
p[3] = (x >> 24) & 0xff;
}
static uint32_t get_uint32le(unsigned char* p)
{
return (p[3] << 24) | (p[2] << 16) | (p[1]<<8) | p[0];
}
void usage(void)
{
printf("Usage: mktccboot <firmware file> <boot file> <output file>\n");
exit(1);
}
off_t filesize(int fd) {
struct stat buf;
if (fstat(fd,&buf) < 0) {
perror("[ERR] Checking filesize of input file");
return -1;
} else {
return(buf.st_size);
}
}
int main(int argc, char *argv[])
{
char *infile, *bootfile, *outfile;
int fdin, fdboot,fdout;
int n;
int inlength,bootlength;
uint32_t ldr;
unsigned char* image;
int origoffset;
if(argc < 3) {
usage();
}
infile = argv[1];
bootfile = argv[2];
outfile = argv[3];
fdin = open(infile, O_RDONLY|O_BINARY);
if (fdin < 0)
{
perror(infile);
}
fdboot = open(bootfile, O_RDONLY|O_BINARY);
if (fdboot < 0)
{
perror(bootfile);
}
inlength = filesize(fdin);
bootlength = filesize(fdboot);
image = malloc(inlength + bootlength);
if (image==NULL)
{
printf("[ERR] Could not allocate memory, aborting\n");
return 1;
}
n = read(fdin, image, inlength);
if (n != inlength)
{
printf("[ERR] Could not read from %s\n",infile);
return 2;
}
n = read(fdboot, image + inlength, bootlength);
if (n != bootlength)
{
printf("[ERR] Could not read from %s\n",bootfile);
return 3;
}
ldr = get_uint32le(image);
/* TODO: Verify it's a LDR instruction */
origoffset = (ldr&0xfff) + 8;
printf("original firmware entry point: 0x%08x\n",get_uint32le(image + origoffset));
printf("New entry point: 0x%08x\n",0x20000000 + inlength + 8);
/* Save the original firmware entry point at the start of the bootloader image */
put_uint32le(get_uint32le(image + origoffset),image+inlength);
put_uint32le(0x20000000 + inlength,image + inlength + 4);
/* Change the original firmware entry point to the third word in our bootloader */
put_uint32le(0x20000000 + inlength + 8,image+origoffset);
telechips_encode_crc(image, inlength + bootlength);
fdout = open(outfile, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644);
if (fdout < 0)
{
perror(bootfile);
}
n = write(fdout, image, inlength + bootlength);
if (n != inlength + bootlength)
{
printf("[ERR] Could not write output file %s\n",outfile);
return 3;
}
close(fdin);
close(fdboot);
close(fdout);
return 0;
}
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