xref: /netbsd/lib/libc/arch/sparc/gen/_setjmp.S (revision bf9ec67e)
1/*	$NetBSD: _setjmp.S,v 1.6 1999/06/27 11:10:18 pk Exp $	*/
2
3/*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Paul Kranenburg.
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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <machine/asm.h>
40#include <machine/trap.h>
41
42#if defined(LIBC_SCCS) && !defined(lint)
43RCSID("$NetBSD: _setjmp.S,v 1.6 1999/06/27 11:10:18 pk Exp $")
44#endif /* LIBC_SCCS and not lint */
45
46/*
47 * C library -- _setjmp, _longjmp
48 *
49 *	_longjmp(a,v)
50 * will generate a "return(v?v:1)" from
51 * the last call to
52 *	_setjmp(a)
53 * The previous signal state is NOT restored.
54 */
55
56ENTRY(_setjmp)
57	st	%sp, [%o0+0]	/* store caller's stack pointer */
58	st	%o7, [%o0+4]	/* and the return pc */
59	retl
60	 clr	%o0		! return 0
61
62ENTRY(_longjmp)
63	sub	%sp, 64, %sp	! set up a local stack frame
64	tst	%o1		! compute v ? v : 1
65	be,a	0f
66	 mov	1, %o1
670:
68	t	ST_FLUSHWIN	! flush register windows out to the stack
69
70	/*
71	 * We restore the saved stack pointer to %fp, then issue
72	 * a `restore' instruction which will reload the register
73	 * window from the stack.
74	 */
75	ld	[%o0+4], %o7	/* restore return pc */
76	ld	[%o0+0], %fp	/* and stack pointer */
77
78	retl			! success, return %g6
79	 restore	%o1, 0, %o0
80