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start.S revision 1.2 
      1 /*	$NetBSD: start.S,v 1.2 2002/11/16 08:55:05 wdk Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Wayne Knowles
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <mips/asm.h>
     40 #include <mips/cpuregs.h>
     41 #include <machine/prom.h>
     42 
     43 LEAF(start)
     44 	.set	noreorder
     45 #ifdef __GP_SUPPORT__
     46 	la      gp, _C_LABEL (_gp)
     47 #endif
     48 	la	sp, start - CALLFRAME_SIZ
     49 	sw	zero, CALLFRAME_RA(sp)		# clear ra for debugger
     50 	sw	zero, CALLFRAME_SP(sp)		# clear fp for debugger
     51 	move	s0, a0				# save argc
     52 	move	s1, a1				# save argv
     53 
     54 	la	a0, _C_LABEL (edata)		# clear BSS
     55 	move	a1, zero
     56 	la	a2, _C_LABEL (end)
     57 	jal	_C_LABEL(memset)		# memset(edata, 0, end - edata)
     58 	subu	a2, a2, a0
     59 
     60 	move	a0, s0				# restore argc
     61 	jal	_C_LABEL(main)			# main(argc, argv)
     62 	move	a1, s1				# restore argv
     63 
     64 XLEAF(_rtt)
     65 	la	t9, _C_LABEL(prom_restart)		# restart...
     66 	j	t9
     67 	move	a0, zero
     68 END(start)
     69