128 lines
4.8 KiB
ArmAsm
128 lines
4.8 KiB
ArmAsm
/* $NetBSD: srt0.s,v 1.1.1.1 1998/06/09 07:53:06 dbj Exp $ */
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/*
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* Copyright (c) 1994 Rolf Grossmann
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Rolf Grossmann.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Startup code for standalone system
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*/
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.globl _mg | struct prominfo
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.globl _end
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.globl _edata
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.globl _main
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.text
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.globl start
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start:
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|| clear bss (this shouldn't hurt us i.e. cause an exception)
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movel #_edata,a2 | start of BSS
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movel #_end,a3 | end
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Lclr:
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clrb a2@+ | clear BSS
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cmpl a2,a3 | done?
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bne Lclr | no, keep going
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movl #0x0808,d0
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movc d0,cacr | clear and disable on-chip cache(s)
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|| catch exceptions myself
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movec vbr, a3
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movel a3, save_vbr | save register for restoration
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lea vectbl, a4
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movel a3@(4),a4@(4) | copy mg, just for sure
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movel a3@(180),a4@(180) | copy vector for trap #13
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movel a3@(124),a4@(124) | copy vector for int 7
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movec a4,vbr | use the new table
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|| save mg as pi
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movel a3@(4),_mg
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|| make sure we disallow interrupts
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movew #0x2600,sr
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|| let's go
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movel sp@(4),sp@- | copy the argument we got
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jsr _main | call C
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addql #4,sp
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|| restore prom vectors
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movel save_vbr, a0
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movec a0,vbr
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|| return kernel start address (still in d0)
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rts
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.globl __halt
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__halt:
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movel save_vbr, a0
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movec a0,vbr | restore prom vbr
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hloop:
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movel #halt, d0
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trap #13 | halt the system
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bra hloop | and don't allow continuation
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.globl _trap
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trap:
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moveml d0-d7/a0-a7,sp@- | save all registers
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movel sp,sp@- | push pointer to registers
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jsr _trap | call C to handle things (dump regs)
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addql #4,sp
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tstl d0
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jeq Lstop
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moveml sp@+,d0-d7/a0-a7
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rte
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Lstop:
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bra Lstop | don't move
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.data
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save_vbr:
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.long 0
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halt:
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.asciz "-h"
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vectbl: | copy of vector table (can't use .fill)
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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.long trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap,trap
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