stand/common/start.S

1.1  wdk /*	$NetBSD: start.S,v 1.1 2000/09/18 11:40:48 wdk Exp $	*/
1.1  wdk
1.1  wdk /*
1.1  wdk  * Copyright (c) 2000 The NetBSD Foundation, Inc.
1.1  wdk  * All rights reserved.
1.1  wdk  *
1.1  wdk  * This code is derived from software contributed to The NetBSD Foundation
1.1  wdk  * by Wayne Knowles
1.1  wdk  *
1.1  wdk  * Redistribution and use in source and binary forms, with or without
1.1  wdk  * modification, are permitted provided that the following conditions
1.1  wdk  * are met:
1.1  wdk  * 1. Redistributions of source code must retain the above copyright
1.1  wdk  *    notice, this list of conditions and the following disclaimer.
1.1  wdk  * 2. Redistributions in binary form must reproduce the above copyright
1.1  wdk  *    notice, this list of conditions and the following disclaimer in the
1.1  wdk  *    documentation and/or other materials provided with the distribution.
1.1  wdk  * 3. All advertising materials mentioning features or use of this software
1.1  wdk  *    must display the following acknowledgement:
1.1  wdk  *        This product includes software developed by the NetBSD
1.1  wdk  *        Foundation, Inc. and its contributors.
1.1  wdk  * 4. Neither the name of The NetBSD Foundation nor the names of its
1.1  wdk  *    contributors may be used to endorse or promote products derived
1.1  wdk  *    from this software without specific prior written permission.
1.1  wdk  *
1.1  wdk  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
1.1  wdk  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.1  wdk  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.1  wdk  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
1.1  wdk  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.1  wdk  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.1  wdk  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.1  wdk  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.1  wdk  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.1  wdk  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.1  wdk  * POSSIBILITY OF SUCH DAMAGE.
1.1  wdk  */
1.1  wdk
1.1  wdk #include <mips/asm.h>
1.1  wdk #include <mips/cpuregs.h>
1.1  wdk #include <machine/prom.h>
1.1  wdk
1.1  wdk 	.set	noreorder
1.1  wdk LEAF(start)
1.1  wdk #ifdef __GP_SUPPORT__
1.1  wdk 	la      gp, _C_LABEL (_gp)
1.1  wdk #endif
1.1  wdk 	la	sp, start - CALLFRAME_SIZ
1.1  wdk 	sw	zero, CALLFRAME_RA(sp)		# clear ra for debugger
1.1  wdk 	sw	zero, CALLFRAME_SP(sp)		# clear fp for debugger
1.1  wdk 	move	s0, a0				# save argc
1.1  wdk 	move	s1, a1				# save argv
1.1  wdk
1.1  wdk 	la	a0, _C_LABEL (edata)		# clear BSS
1.1  wdk 	move	a1, zero
1.1  wdk 	la	a2, _C_LABEL (end)
1.1  wdk 	jal	_C_LABEL(memset)		# memset(edata, 0, end - edata)
1.1  wdk 	subu	a2, a2, a0
1.1  wdk
1.1  wdk 	move	a0, s0				# restore argc
1.1  wdk 	jal	_C_LABEL(main)			# main(argc, argv)
1.1  wdk 	move	a1, s1				# restore argv
1.1  wdk
1.1  wdk XLEAF(_rtt)
1.1  wdk 	j	_C_LABEL(prom_restart)		# restart...
1.1  wdk 	nop
1.1  wdk END(start)