2acc0ac542
later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2005 by Jens Arnold
|
|
*
|
|
* Self-extracting firmware loader to work around the 200KB size limit
|
|
* for archos player and recorder v1
|
|
* Decompresses a built-in UCL-compressed image (method 2e) and executes it.
|
|
*
|
|
* 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 "uclimage.h"
|
|
|
|
#define ICODE_ATTR __attribute__ ((section (".icode")))
|
|
|
|
/* Symbols defined in the linker script */
|
|
extern char iramcopy[], iramstart[], iramend[];
|
|
extern char stackend[];
|
|
extern char loadaddress[], dramend[];
|
|
|
|
/* Prototypes */
|
|
extern void start(void);
|
|
|
|
void main(void) ICODE_ATTR;
|
|
int ucl_nrv2e_decompress_8(const unsigned char *src, unsigned char *dst,
|
|
unsigned long *dst_len) ICODE_ATTR;
|
|
|
|
/* Vector table */
|
|
void (*vbr[]) (void) __attribute__ ((section (".vectors"))) =
|
|
{
|
|
start, (void *)stackend,
|
|
start, (void *)stackend,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
};
|
|
|
|
/** All subsequent functions are executed from IRAM **/
|
|
|
|
/* Thinned out version of the UCL 2e decompression sourcecode
|
|
* Original (C) Markus F.X.J Oberhumer under GNU GPL license */
|
|
#define GETBIT(bb, src, ilen) \
|
|
(((bb = bb & 0x7f ? bb*2 : ((unsigned)src[ilen++]*2+1)) >> 8) & 1)
|
|
|
|
int ucl_nrv2e_decompress_8(const unsigned char *src, unsigned char *dst,
|
|
unsigned long *dst_len)
|
|
{
|
|
unsigned long bb = 0;
|
|
unsigned ilen = 0, olen = 0, last_m_off = 1;
|
|
|
|
for (;;)
|
|
{
|
|
unsigned m_off, m_len;
|
|
|
|
while (GETBIT(bb,src,ilen))
|
|
dst[olen++] = src[ilen++];
|
|
|
|
m_off = 1;
|
|
for (;;)
|
|
{
|
|
m_off = m_off*2 + GETBIT(bb,src,ilen);
|
|
if (GETBIT(bb,src,ilen))
|
|
break;
|
|
m_off = (m_off-1)*2 + GETBIT(bb,src,ilen);
|
|
}
|
|
if (m_off == 2)
|
|
{
|
|
m_off = last_m_off;
|
|
m_len = GETBIT(bb,src,ilen);
|
|
}
|
|
else
|
|
{
|
|
m_off = (m_off-3)*256 + src[ilen++];
|
|
if (m_off == 0xffffffff)
|
|
break;
|
|
m_len = (m_off ^ 0xffffffff) & 1;
|
|
m_off >>= 1;
|
|
last_m_off = ++m_off;
|
|
}
|
|
if (m_len)
|
|
m_len = 1 + GETBIT(bb,src,ilen);
|
|
else if (GETBIT(bb,src,ilen))
|
|
m_len = 3 + GETBIT(bb,src,ilen);
|
|
else
|
|
{
|
|
m_len++;
|
|
do {
|
|
m_len = m_len*2 + GETBIT(bb,src,ilen);
|
|
} while (!GETBIT(bb,src,ilen));
|
|
m_len += 3;
|
|
}
|
|
m_len += (m_off > 0x500);
|
|
{
|
|
const unsigned char *m_pos;
|
|
m_pos = dst + olen - m_off;
|
|
dst[olen++] = *m_pos++;
|
|
do dst[olen++] = *m_pos++; while (--m_len > 0);
|
|
}
|
|
}
|
|
*dst_len = olen;
|
|
|
|
return ilen;
|
|
}
|
|
|
|
#define ALIGNED_IMG_SIZE ((sizeof(image) + 3) & ~3)
|
|
/* This will never return */
|
|
void main(void)
|
|
{
|
|
unsigned long dst_len; /* dummy */
|
|
unsigned long *src = (unsigned long *)image;
|
|
unsigned long *dst = (unsigned long *)(dramend - ALIGNED_IMG_SIZE);
|
|
|
|
do
|
|
*dst++ = *src++;
|
|
while (dst < (unsigned long *)dramend);
|
|
|
|
ucl_nrv2e_decompress_8(dramend - ALIGNED_IMG_SIZE, loadaddress, &dst_len);
|
|
|
|
asm(
|
|
"mov.l @%0+,r0 \n"
|
|
"jmp @r0 \n"
|
|
"mov.l @%0+,r15 \n"
|
|
: : "r"(loadaddress) : "r0"
|
|
);
|
|
}
|