44 lines
1.5 KiB
ArmAsm
44 lines
1.5 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 © 2009 Michael Sparmann
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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 .init.text, "ax", %progbits
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.global _start
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_start:
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mov r0, #0xD7
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msr CPSR_c, r0 @ Abort mode, IRQs/FIQs disabled
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ldr sp, =_exception_stack
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mov r0, #0xDB
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msr CPSR_c, r0 @ Undefined Instruction mode, IRQs/FIQs disabled
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ldr sp, =_exception_stack
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mov r0, #0xD3
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msr CPSR_c, r0 @ Supervisor mode, IRQs/FIQs disabled
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ldr sp, =_supervisor_stack
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MOV R0, #0x00050000
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ORR R0, #0x00000078
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MCR p15, 0, R0, c1, c0, 0 @ Get rid of some CPU "features" likely to cause trouble
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bl main
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.ltorg
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