| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2005 by Jens Arnold |
| * based on crt0.S 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. |
| * |
| ****************************************************************************/ |
| .section .start,"ax",@progbits |
| .global _start |
| _start: |
| /* copy the .iram section */ |
| mov.l .iramcopy_k,r0 |
| mov.l .iram_k,r1 |
| mov.l .iramend_k,r2 |
| /* Note: We cannot put a PC relative load into the delay slot of a 'bra' |
| instruction (the offset would be wrong), but there is nothing else to |
| do before the loop, so the delay slot would be 'nop'. The cmp / bf |
| sequence is the same length, but more efficient. */ |
| cmp/hi r1,r2 |
| bf .noiramcopy |
| .iramloop: |
| mov.l @r0+,r3 |
| mov.l r3,@r1 |
| add #4,r1 |
| cmp/hi r1,r2 |
| bt .iramloop |
| .noiramcopy: |
| |
| /* call the mainline */ |
| mov.l .main_k,r0 |
| mov.l .stackend_k,r15 |
| jmp @r0 |
| nop |
| |
| .align 2 |
| .iramcopy_k: |
| .long _iramcopy |
| .iram_k: |
| .long _iramstart |
| .iramend_k: |
| .long _iramend |
| .stackend_k: |
| .long _stackend |
| .main_k: |
| .long _main |