1/*	$NetBSD: swapcontext.S,v 1.8 2020/10/15 05:27:53 skrll 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
35#if defined(SYSLIBC_SCCS) && !defined(lint)
36	RCSID("$NetBSD: swapcontext.S,v 1.8 2020/10/15 05:27:53 skrll Exp $")
37#endif /* SYSLIBC_SCCS && !lint */
38
39	.set	reorder
40
41NESTED(swapcontext, CALLFRAME_SIZ, ra)
42	.mask	0x80000030, (CALLFRAME_RA - CALLFRAME_SIZ)
43	PIC_PROLOGUE(swapcontext)
44	PTR_SUBU	sp, sp, CALLFRAME_SIZ
45	PTR_S		ra, CALLFRAME_RA(sp)	# save ra
46	PTR_S		a0, 0(sp)		# stash away oucp
47	PTR_S		a1, SZREG(sp)		# stash away ucp
48	SYSTRAP(getcontext)
49	PTR_L		ra, CALLFRAME_RA(sp)
50	bne		a3, zero, 1f
51
52	PTR_L		v1, 0(sp)		# load oucp again for adjustment
53	PTR_L		a0, SZREG(sp)		# load ucp
54	PTR_ADDIU	v0, sp, CALLFRAME_SIZ
55	REG_PROLOGUE
56	REG_S		zero, _UC_GREGS_V0(v1)
57#if defined(__mips_n32) || defined(__mips_n64)
58	/* PIC_PROLOGUE saved gp in t3 */
59	REG_S		t3, _UC_GREGS_GP(v1)
60#endif
61	REG_S		ra, _UC_GREGS_EPC(v1)
62	REG_S		v0, _UC_GREGS_SP(v1)
63	REG_EPILOGUE
64
65	PIC_TAILCALL(setcontext)
66	/* NOTREACHED */
671:
68	PTR_ADDU	sp, sp, CALLFRAME_SIZ
69	SETUP_GPX(t0);
70	SETUP_GP64(t3,swapcontext);
71	PIC_TAILCALL(__cerror)
72END(swapcontext)
73