137 lines
4.2 KiB
ArmAsm
137 lines
4.2 KiB
ArmAsm
/* $NetBSD: start.S,v 1.2 1997/06/16 01:24:00 jonathan Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)start.s 8.2 (Berkeley) 1/21/94
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*/
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/*
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* start.s -
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*
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* Contains code that is the first executed at boot time.
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*
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* Copyright (C) 1989 Digital Equipment Corporation.
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies.
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* Digital Equipment Corporation makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* from: Header: /sprite/src/boot/decprom/ds3100.md/RCS/start.s,
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* v 1.1 90/02/16 16:19:39 shirriff Exp SPRITE (DECWRL)
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*/
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#include <mips/regdef.h>
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#include <mips/asm.h>
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#include <mips/cpuregs.h>
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#include <pmax/stand/dec_prom.h>
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/*
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* Amount to take off of the stack for the benefit of the debugger.
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*/
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#define START_FRAME ((4 * 4) + 4 + 4)
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.globl start
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start:
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.set noreorder
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#ifdef __GP_SUPPORT__
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la gp, _C_LABEL (_gp)
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#endif
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la sp, start - START_FRAME
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sw zero, START_FRAME - 4(sp) # Zero out old ra for debugger
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sw zero, START_FRAME - 8(sp) # Zero out old fp for debugger
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move s0, a0 # save argc
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move s1, a1 # save argv
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move s3, a3 # save call vector
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beq a2, 0x30464354, 1f # jump if boot from DS5000
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nop
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la s3, _C_LABEL(callvec) # init call vector
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1:
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la a0, _C_LABEL (edata) # clear BSS
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la a1, _C_LABEL (end)
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jal _C_LABEL(bzero) # bzero(edata, end - edata)
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subu a1, a1, a0
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sw s3, _C_LABEL(callv) # save call vector
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move a0, s0 # restore argc
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jal _C_LABEL(main) # main(argc, argv)
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move a1, s1 # restore argv
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j _C_LABEL(prom_restart) # restart...
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nop
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/* dummy routine for gcc2 */
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.globl _C_LABEL(__main)
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_C_LABEL(__main):
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j ra
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nop
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LEAF(prom_restart)
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lw v0, _C_LABEL (callv)
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lw v0, 0x9C(v0) /* halt */
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move a0, zero /* Don't print anything. */
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j v0
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move a1, zero
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END(prom_restart)
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#if 0
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LEAF(prom_open)
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li v0, DEC_PROM_OPEN
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j v0
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nop
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END(prom_open)
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LEAF(prom_lseek)
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li v0, DEC_PROM_LSEEK
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j v0
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nop
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END(prom_lseek)
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LEAF(prom_read)
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li v0, DEC_PROM_READ
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j v0
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nop
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END(prom_read)
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#endif
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LEAF(printf)
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lw v0, _C_LABEL(callv) # get pointer to call back vectors
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sw a1, 4(sp) # store args on stack for printf
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lw v0, 48(v0) # offset for callv->printf
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sw a2, 8(sp)
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j v0 # call PROM printf
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sw a3, 12(sp)
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END(printf)
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