1 files changed, 206 insertions, 0 deletions

diff --git a/rbutil/mktccboot/mktccboot.c b/rbutil/mktccboot/mktccboot.c
new file mode 100644
index 0000000000..e135b7e506
--- /dev/null
+++ b/rbutil/mktccboot/mktccboot.c
@@ -0,0 +1,206 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 = -1, fdboot = -1, fdout = -1;
+    int n;
+    int inlength,bootlength;
+    uint32_t ldr;
+    unsigned char* image;
+    int origoffset;
+    int ret = 0;
+    
+    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);
+        ret = 1;
+        goto error_exit;
+    }
+
+    fdboot = open(bootfile, O_RDONLY|O_BINARY);
+    if (fdboot < 0)
+    {
+        perror(bootfile);
+        ret = 2;
+        goto error_exit;
+    }
+
+    inlength = filesize(fdin);
+    bootlength = filesize(fdboot);
+    
+    image = malloc(inlength + bootlength);
+
+    if (image==NULL)
+    {
+        printf("[ERR]  Could not allocate memory, aborting\n");
+        ret = 3;
+        goto error_exit;
+    }
+
+    n = read(fdin, image, inlength);
+    if (n != inlength)
+    {
+        printf("[ERR] Could not read from %s\n",infile);
+        ret = 4;
+        goto error_exit;
+    }
+
+    n = read(fdboot, image + inlength, bootlength);
+    if (n != bootlength)
+    {
+        printf("[ERR] Could not read from %s\n",bootfile);
+        ret = 5;
+        goto error_exit;
+    }
+
+    ldr = get_uint32le(image);
+
+    /* TODO: Verify it's a LDR instruction */
+    origoffset = (ldr&0xfff) + 8;
+
+    printf("original firmware entry point: 0x%08x\n", 
+           (unsigned int) 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);
+        ret = 6;
+        goto error_exit;
+    }
+
+    n = write(fdout, image, inlength + bootlength);
+    if (n != inlength + bootlength)
+    {
+        printf("[ERR] Could not write output file %s\n",outfile);
+        ret = 7;
+        goto error_exit;
+    }
+
+error_exit:
+
+    if (fdin >= 0)
+        close(fdin);
+
+    if (fdboot >= 0)
+        close(fdboot);
+
+    if (fdout >= 0)
+        close(fdout);
+
+    return ret;
+}