_setjmp.S revision 88609 
1/*
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
38 */
39
40#if defined(LIBC_SCCS) && !defined(lint)
41#if 0
42	.asciz "@(#)_setjmp.s	8.1 (Berkeley) 6/4/93"
43#else
44	RCSID("$NetBSD: _setjmp.S,v 1.4 1998/10/08 02:27:59 eeh Exp $")
45#endif
46#endif /* LIBC_SCCS and not lint */
47
48#if defined(SYSLIBC_RCS) && !defined(lint)
49	.text
50	.asciz "$FreeBSD: head/lib/libc/sparc64/gen/_setjmp.S 88609 2001-12-29 06:37:33Z jake $"
51#endif /* SYSLIBC_RCS and not lint */
52
53#include <machine/asm.h>
54
55#include "assym.s"
56
57	.register %g2,#ignore
58	.register %g3,#ignore
59
60/*
61 * C library -- _setjmp, _longjmp
62 *
63 *	_longjmp(a,v)
64 * will generate a "return(v?v:1)" from
65 * the last call to
66 *	_setjmp(a)
67 * by unwinding the call stack.
68 * The previous signal state is NOT restored.
69 */
70
71ENTRY(_setjmp)
72	stx	%sp, [%o0 + _JB_SP]
73	stx	%o7, [%o0 + _JB_PC]
74	stx	%fp, [%o0 + _JB_FP]
75	retl
76	 clr	%o0
77END(_setjmp)
78
79ENTRY(_longjmp)
80	mov	1, %g1
81	movrnz	%o1, %o1, %g1			! compute v ? v : 1
82	mov	%o0, %g2
83	ldx	[%g2 + _JB_FP], %g3		! fetch callers frame
841:	cmp	%fp, %g3			! compare against desired frame
85	bl,a	1b				! if below,
86	 restore				!    pop frame and loop
87	be,a	2f				! if there,
88	 ldx	[%g2 + _JB_SP], %o0		!    fetch return %sp
89
90.Lbotch:
91	call	CNAME(longjmperror)
92	 nop
93	call	CNAME(abort)
94	 nop
95	illtrap
96
972:	cmp	%o0, %sp			! %sp must not decrease
98	bge,a	3f
99	 mov	%o0, %sp			! it is OK, put it in place
100	b,a	.Lbotch
101	 nop
1023:	ldx	[%g2 + _JB_PC], %o7		! fetch return address
103	retl
104	 mov	%g1, %o0			! return v ? v : 1;
105END(_longjmp)
106