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      1 /*	$NetBSD: start.S,v 1.3 2008/04/28 20:23:29 martin 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <mips/asm.h>
     33 #include <mips/cpuregs.h>
     34 #include <machine/prom.h>
     35 
     36 LEAF(start)
     37 	.set	noreorder
     38 #ifdef __GP_SUPPORT__
     39 	la      gp, _C_LABEL (_gp)
     40 #endif
     41 	la	sp, start - CALLFRAME_SIZ
     42 	sw	zero, CALLFRAME_RA(sp)		# clear ra for debugger
     43 	sw	zero, CALLFRAME_SP(sp)		# clear fp for debugger
     44 	move	s0, a0				# save argc
     45 	move	s1, a1				# save argv
     46 
     47 	la	a0, _C_LABEL (edata)		# clear BSS
     48 	move	a1, zero
     49 	la	a2, _C_LABEL (end)
     50 	jal	_C_LABEL(memset)		# memset(edata, 0, end - edata)
     51 	subu	a2, a2, a0
     52 
     53 	move	a0, s0				# restore argc
     54 	jal	_C_LABEL(main)			# main(argc, argv)
     55 	move	a1, s1				# restore argv
     56 
     57 XLEAF(_rtt)
     58 	la	t9, _C_LABEL(prom_restart)		# restart...
     59 	j	t9
     60 	move	a0, zero
     61 END(start)
     62