128 lines
3.6 KiB
ArmAsm
128 lines
3.6 KiB
ArmAsm
/* $NetBSD: srt0.s,v 1.2 2001/05/12 22:35:30 chs 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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#include <machine/asm.h>
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/*
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* Startup code for standalone system
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*/
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.text
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ASENTRY_NOPROFILE(start)
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|| clear bss (this should not hurt us i.e. cause an exception)
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movel #_C_LABEL(edata),%a2 | start of BSS
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movel #_C_LABEL(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),_C_LABEL(mg)
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|| make sure we disallow interrupts
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movew #0x2600,%sr
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|| away we go
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movel %sp@(4),%sp@- | copy the argument we got
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jsr _C_LABEL(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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ENTRY(_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 do not allow continuation
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ASENTRY_NOPROFILE(astrap)
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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 _C_LABEL(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 | stay here
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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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#define TRAP16 \
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VECTOR(astrap); VECTOR(astrap); VECTOR(astrap); VECTOR(astrap); \
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VECTOR(astrap); VECTOR(astrap); VECTOR(astrap); VECTOR(astrap); \
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VECTOR(astrap); VECTOR(astrap); VECTOR(astrap); VECTOR(astrap); \
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VECTOR(astrap); VECTOR(astrap); VECTOR(astrap); VECTOR(astrap);
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vectbl:
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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TRAP16
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