_setjmp.S revision 85518 
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 85518 2001-10-26 05:40:07Z jake $"
51#endif /* SYSLIBC_RCS and not lint */
52
53#include <machine/asm.h>
54
55/*
56 * C library -- _setjmp, _longjmp
57 *
58 *	_longjmp(a,v)
59 * will generate a "return(v?v:1)" from
60 * the last call to
61 *	_setjmp(a)
62 * by unwinding the call stack.
63 * The previous signal state is NOT restored.
64 */
65
66#define	JB_SP	0x0
67#define	JB_PC	0x8
68#define	JB_FP	0x10
69
70ENTRY(_setjmp)
71	stx	%sp, [%o0 + JB_SP]	/* store caller's stack pointer */
72	stx	%o7, [%o0 + JB_PC]	/* ... return pc */
73	stx	%fp, [%o0 + JB_FP]	/* ... and frame pointer */
74	retl
75	 clr	%o0		! return 0
76
77ENTRY(_longjmp)
78	mov	1, %g6
79	movrnz	%o1, %o1, %g6	! compute v ? v : 1 in a global register
80	mov	%o0, %g1	! save a in another global register
81	ldx	[%g1 + JB_FP], %g7	/* get caller's frame */
821:	cmp	%fp, %g7	! compare against desired frame
83	bl,a	1b		! if below,
84	 restore		!    pop frame and loop
85	be,a	2f		! if there,
86	 ldx	[%g1 + JB_SP], %o2	!    fetch return %sp
87
88.Lbotch:
89	call	CNAME(longjmperror)	! otherwise, went too far; bomb out
90	 nop
91	illtrap
92
932:	cmp	%o2, %sp	! %sp must not decrease
94	bge,a	3f
95	 mov	%o2, %sp	! it is OK, put it in place
96	b,a	.Lbotch
97	 nop
983:	ldx	[%g1 + JB_PC], %o3	! fetch pc
99	jmp	%o3 + 8		! success, return %g6
100	 mov	%g6, %o0
101
102