58 lines
1.8 KiB
ArmAsm
58 lines
1.8 KiB
ArmAsm
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 by Jens Arnold
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* based on crt0.S by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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.section .start,"ax",@progbits
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.global _start
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_start:
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/* copy the .iram section */
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mov.l .iramcopy_k,r0
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mov.l .iram_k,r1
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mov.l .iramend_k,r2
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/* Note: We cannot put a PC relative load into the delay slot of a 'bra'
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instruction (the offset would be wrong), but there is nothing else to
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do before the loop, so the delay slot would be 'nop'. The cmp / bf
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sequence is the same length, but more efficient. */
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cmp/hi r1,r2
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bf .noiramcopy
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.iramloop:
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mov.l @r0+,r3
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mov.l r3,@r1
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add #4,r1
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cmp/hi r1,r2
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bt .iramloop
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.noiramcopy:
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/* call the mainline */
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mov.l .main_k,r0
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mov.l .stackend_k,r15
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jmp @r0
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nop
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.align 2
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.iramcopy_k:
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.long _iramcopy
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.iram_k:
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.long _iramstart
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.iramend_k:
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.long _iramend
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.stackend_k:
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.long _stackend
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.main_k:
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.long _main
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