1 /* $NetBSD: setjmp.S,v 1.12 2011/04/30 23:41:13 martin Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp
38 #include <machine/asm.h>
39 #if defined(LIBC_SCCS) && !defined(lint)
41 .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93"
43 RCSID("$NetBSD: setjmp.S,v 1.12 2011/04/30 23:41:13 martin Exp $")
45 #endif /* LIBC_SCCS and not lint */
48 * C library -- setjmp, longjmp
51 * will generate a "return(v)" from
54 * by restoring registers from the stack,
55 * and a struct sigcontext, see <signal.h>
63 * local vars on stack: struct sigstack foo @ offset 0x48
64 * Note: sc_g1 is not used; sc_o0 is set in longjmp()
66 mov 1, %o0 /* SIG_BLOCK */
67 add %i0, 32, %o2 /* build sigcontext sc.sc_mask */
68 call _C_LABEL(__sigprocmask14)
69 clr %o1 /* sigprocmask(SIG_BLOCK, NULL, &sc.sc_mask) */
71 add %sp, 0x48, %o1 /* (foo being in arg dump area) */
72 call _C_LABEL(__sigaltstack14)
73 clr %o0 /* sigstack(NULL, &foo) */
75 ld [%sp + 0x48 + 8], %o0 /* foo.ss_flags */
76 and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */
77 st %o1, [%i0 + 0] /* sc.sc_onstack = current onstack; */
78 st %fp, [%i0 + 8] /* sc.sc_sp = (caller's) sp */
80 st %o0, [%i0 + 12] /* sc.sc_pc = return_pc */
81 st %g3, [%i0 + 16] /* sc.sc_npc */
82 st %g0, [%i0 + 20] /* sc.sc_psr = (clean psr) */