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start.S revision 1.2.108.1 
      1  1.2.108.1  mjf /*	$NetBSD: start.S,v 1.2.108.1 2008/06/02 13:22:25 mjf 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)
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