xref: /netbsd-src/sys/arch/pmax/stand/common/startprog.S (revision 157a6dd44c6c7ee26429329da5f3b06a4e312199)
1*157a6dd4Stsutsui/*	$NetBSD: startprog.S,v 1.8 2011/01/10 15:25:44 tsutsui Exp $	*/
281ff761eSsimonb
381ff761eSsimonb/*-
481ff761eSsimonb * Copyright (c) 1999 The NetBSD Foundation, Inc.
581ff761eSsimonb * All rights reserved.
681ff761eSsimonb *
781ff761eSsimonb * This code is derived from software contributed to The NetBSD Foundation
881ff761eSsimonb * by Jonathan Stone, Michael Hitch and Simon Burge.
981ff761eSsimonb *
1081ff761eSsimonb * Redistribution and use in source and binary forms, with or without
1181ff761eSsimonb * modification, are permitted provided that the following conditions
1281ff761eSsimonb * are met:
1381ff761eSsimonb * 1. Redistributions of source code must retain the above copyright
1481ff761eSsimonb *    notice, this list of conditions and the following disclaimer.
1581ff761eSsimonb * 2. Redistributions in binary form must reproduce the above copyright
1681ff761eSsimonb *    notice, this list of conditions and the following disclaimer in the
1781ff761eSsimonb *    documentation and/or other materials provided with the distribution.
1881ff761eSsimonb *
1981ff761eSsimonb * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
2081ff761eSsimonb * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
2181ff761eSsimonb * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
2281ff761eSsimonb * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
2381ff761eSsimonb * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
2481ff761eSsimonb * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
2581ff761eSsimonb * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
2681ff761eSsimonb * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
2781ff761eSsimonb * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
2881ff761eSsimonb * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
2981ff761eSsimonb * POSSIBILITY OF SUCH DAMAGE.
3081ff761eSsimonb */
3181ff761eSsimonb
3281ff761eSsimonb/*
3381ff761eSsimonb * startprog(entry, stack, argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr);
3481ff761eSsimonb *
3581ff761eSsimonb * load new stack pointer, then call
3681ff761eSsimonb *  entry(argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr);
3781ff761eSsimonb */
3881ff761eSsimonb
3981ff761eSsimonb#include <mips/asm.h>
4081ff761eSsimonb
4138b3ed96Stsutsui	.set	noreorder
4281ff761eSsimonbLEAF(startprog)
43290a34a0Smatt        subu    sp,sp,CALLFRAME_SIZ
44290a34a0Smatt	addu	t2,a1,-CALLFRAME_SIZ	# new stack value
45290a34a0Smatt	move	t9,a0
4681ff761eSsimonb	move	a0,a2
4781ff761eSsimonb	move	a1,a3
4881ff761eSsimonb
49290a34a0Smatt#ifdef __mips_o32
50851a3a4cStsutsui	lw	a2,CALLFRAME_SIZ+16(sp)	# load everything from old stack we need
51851a3a4cStsutsui	lw	a3,CALLFRAME_SIZ+20(sp)
52851a3a4cStsutsui	lw	$8,CALLFRAME_SIZ+24(sp)	# use a4/t0 in case N32/N64 kernel
53851a3a4cStsutsui	lw	$9,CALLFRAME_SIZ+28(sp)	# use a5/t1 in case N32/N64 kernel
54290a34a0Smatt#else
55290a34a0Smatt	move	a2,a4
56290a34a0Smatt	move	a3,a5
57290a34a0Smatt	move	a4,a6
58290a34a0Smatt	move	a5,a7
59290a34a0Smatt#endif
6081ff761eSsimonb
61290a34a0Smatt	move	sp,t2			# new stack pointer
62290a34a0Smatt	sw	ra,CALLFRAME_RA(sp)
6381ff761eSsimonb
64290a34a0Smatt	sw	$8,16(sp)		# save on stack for O32
65290a34a0Smatt	sw	$9,20(sp)		# save on stack for O32
66290a34a0Smatt	jal	ra,t9
6781ff761eSsimonb	 nop				# BDslot
6881ff761eSsimonb
69290a34a0Smatt	lw	ra,CALLFRAME_RA(sp)	# should not get back here!
7081ff761eSsimonb	j	ra
71290a34a0Smatt	 addu	sp,sp,CALLFRAME_SIZ
7281ff761eSsimonbEND(startprog)
73