setjmp.S revision 1.14 
1/*	$NetBSD: setjmp.S,v 1.14 2013/07/16 22:12:20 matt Exp $	*/
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
22 *
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
33 * SUCH DAMAGE.
34 */
35
36#include <machine/asm.h>
37
38#if defined(LIBC_SCCS) && !defined(lint)
39#if 0
40	RCSID("from: @(#)setjmp.s	5.1 (Berkeley) 5/12/90")
41#else
42	RCSID("$NetBSD: setjmp.S,v 1.14 2013/07/16 22:12:20 matt Exp $")
43#endif
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)" from
51 * the last call to
52 *	setjmp(a)
53 * by restoring registers from the stack,
54 * and a struct sigcontext, see <signal.h>
55 */
56
57ENTRY(__setjmp14)
58	/* Get signal stack info.  Note overlay of ss_sp and ss_size! */
59	lea	-12(%sp),%sp	/* sizeof(stack_t) */
60	clrl	(%sp)		/* ss = NULL */
61	movl	%sp,4(%sp)	/* oss = stack_t on stack */
62	jbsr	PIC_PLT(_C_LABEL(__sigaltstack14))
63
64	movl	8(%sp),%d0	/* ss_flags */
65	andl	#1,%d0		/* extract SS_ONSTACK */
66	lea	12(%sp),%sp	/* pop stack_t */
67
68	/* Get pointer to jmp_buf; a sigcontext is at the beginning. */
69	movl	4(%sp),%a0
70	movl	%d0,(%a0)	/* store onstack */
71	clrl	4(%a0)		/* unused word (old style signal mask) */
72
73	/* Get the signal mask. */
74	pea	28(%a0)	/* oset = &sc.sc_mask */
75	movl	#0,-(%sp)	/* set = NULL */
76	movl	#0,-(%sp)	/* action = 0 <ignored> */
77	jbsr	PIC_PLT(_C_LABEL(__sigprocmask14))
78	addl	#12,%sp
79
80	movl	4(%sp),%a0	/* get jmp_buf pointer again */
81	lea	4(%sp),%a1	/* adjust SP since we won't rts */
82	movl	%a1,8(%a0)	/* save SP */
83	movl	%a6,12(%a0)	/* save FP */
84	clrl	16(%a0)	/* no AP */
85	movl	(%sp),20(%a0)	/* save return PC */
86	clrl	24(%a0)	/* clear PS */
87
88	/* Save remaining non-scratch regs after signal mask. */
89	moveml	#0x3CFC,44(%a0)
90
91	clrl	%d0		/* return 0 */
92	rts
93END(__setjmp14)
94