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start.S revision 1.3 
      1  1.3  martin /*	$NetBSD: start.S,v 1.3 2008/04/28 20:23:29 martin Exp $	*/
      2  1.1     wdk 
      3  1.1     wdk /*
      4  1.1     wdk  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  1.1     wdk  * All rights reserved.
      6  1.1     wdk  *
      7  1.1     wdk  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1     wdk  * by Wayne Knowles
      9  1.1     wdk  *
     10  1.1     wdk  * Redistribution and use in source and binary forms, with or without
     11  1.1     wdk  * modification, are permitted provided that the following conditions
     12  1.1     wdk  * are met:
     13  1.1     wdk  * 1. Redistributions of source code must retain the above copyright
     14  1.1     wdk  *    notice, this list of conditions and the following disclaimer.
     15  1.1     wdk  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1     wdk  *    notice, this list of conditions and the following disclaimer in the
     17  1.1     wdk  *    documentation and/or other materials provided with the distribution.
     18  1.1     wdk  *
     19  1.1     wdk  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1     wdk  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1     wdk  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1     wdk  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1     wdk  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1     wdk  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1     wdk  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1     wdk  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1     wdk  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1     wdk  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1     wdk  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1     wdk  */
     31  1.1     wdk 
     32  1.1     wdk #include <mips/asm.h>
     33  1.1     wdk #include <mips/cpuregs.h>
     34  1.1     wdk #include <machine/prom.h>
     35  1.1     wdk 
     36  1.2     wdk LEAF(start)
     37  1.1     wdk 	.set	noreorder
     38  1.1     wdk #ifdef __GP_SUPPORT__
     39  1.1     wdk 	la      gp, _C_LABEL (_gp)
     40  1.1     wdk #endif
     41  1.1     wdk 	la	sp, start - CALLFRAME_SIZ
     42  1.1     wdk 	sw	zero, CALLFRAME_RA(sp)		# clear ra for debugger
     43  1.1     wdk 	sw	zero, CALLFRAME_SP(sp)		# clear fp for debugger
     44  1.1     wdk 	move	s0, a0				# save argc
     45  1.1     wdk 	move	s1, a1				# save argv
     46  1.1     wdk 
     47  1.1     wdk 	la	a0, _C_LABEL (edata)		# clear BSS
     48  1.1     wdk 	move	a1, zero
     49  1.1     wdk 	la	a2, _C_LABEL (end)
     50  1.1     wdk 	jal	_C_LABEL(memset)		# memset(edata, 0, end - edata)
     51  1.1     wdk 	subu	a2, a2, a0
     52  1.1     wdk 
     53  1.1     wdk 	move	a0, s0				# restore argc
     54  1.1     wdk 	jal	_C_LABEL(main)			# main(argc, argv)
     55  1.1     wdk 	move	a1, s1				# restore argv
     56  1.1     wdk 
     57  1.1     wdk XLEAF(_rtt)
     58  1.2     wdk 	la	t9, _C_LABEL(prom_restart)		# restart...
     59  1.2     wdk 	j	t9
     60  1.2     wdk 	move	a0, zero
     61  1.1     wdk END(start)
     62