setjmp.S revision 111777 
1/*	$NetBSD: setjmp.S,v 1.3 1997/12/05 02:06:27 thorpej Exp $	*/
2
3/*
4 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30#include <machine/asm.h>
31__FBSDID("$FreeBSD: head/lib/libc/ia64/gen/setjmp.S 111777 2003-03-03 01:09:46Z obrien $");
32
33#define     LOCORE
34#include    <machine/setjmp.h>
35
36/*
37 * C library -- setjmp, longjmp
38 *
39 *	longjmp(a,v)
40 * will generate a "return(v)" from
41 * the last call to
42 *	setjmp(a)
43 * by restoring registers from the stack,
44 * and the previous signal state.
45 */
46
47ENTRY(setjmp, 1)
48	alloc	loc0=ar.pfs,1,2,3,0
49	mov	loc1=rp
50	;;
51	mov	out0=1				// how = SIG_BLOCK
52	mov	out1=0				// set = NULL
53	add	out2=J_SIG0,in0			// oset = &jb[J_SIG0]
54	br.call.sptk.few rp=__sys_sigprocmask
55	;;
56	mov	rp=loc1
57	mov	r14=loc0
58	;;
59	alloc	r15=ar.pfs,1,0,0,0		// drop register frame
60	;;
61	mov	ar.pfs=r14			// restore ar.pfs
62	br.sptk.many _setjmp			// finish saving state
63END(setjmp)
64
65	WEAK_ALIAS(longjmp,__longjmp)
66ENTRY(__longjmp, 2)
67	alloc	loc0=ar.pfs,2,2,3,0
68	mov	loc1=rp
69	;;
70	mov	out0=3				// how = SIG_SETMASK
71	add	out1=J_SIG0,in0			// set = &jb[J_SIG0]
72	mov	out2=0				// oset = NULL
73	br.call.sptk.few rp=__sys_sigprocmask
74	;;
75	mov	rp=loc1
76	mov	r14=loc0
77	;;
78	alloc	r15=ar.pfs,2,0,0,0		// drop register frame
79	;;
80	mov	ar.pfs=r14			// restore ar.pfs
81	br.sptk.many _longjmp			// finish restoring state
82END(__longjmp)
83