swapcontext.S revision 1.4 
1/*	$NetBSD: swapcontext.S,v 1.4 2020/10/21 01:24:05 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Klaus Klein.
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 "SYS.h"
33#include "assym.h"
34
35NESTED(swapcontext, 2, 24, ra, IM_RA|IM_A0|IM_A1, 0)
36	LDGP(pv)
37	lda	sp, -24(sp)
38	stq	ra, (24- 8)(sp)		/* must save ra, oucp, ucp */
39	stq	a0, (24-16)(sp)
40	stq	a1, (24-24)(sp)
41	CALL(_getcontext)		/* getcontext(oucp) */
42	ldq	t0, (24-16)(sp)
43	bne	v0, Lerr
44	ldq	t1, (24- 8)(sp)
45	stq	t1, (UC_GREGS + _REG_RA*8)(t0)	/* Adjust saved RA */
46	stq	t1, (UC_GREGS + _REG_PC*8)(t0)	/* Adjust saved PC */
47	lda	t1, 24(sp)
48	stq	t1, (UC_GREGS + _REG_SP*8)(t0)	/* Adjust saved SP */
49
50	ldq	a0, (24-24)(sp)
51	CALL(setcontext)		/* setcontext(ucp) */
52Lerr:
53	ldq	ra, (24- 8)(sp)
54	lda	sp, 24(sp)
55	RET
56END(swapcontext)
57