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#include "assym.h"
38
39#if defined(LIBC_SCCS) && !defined(lint)
40#if 0
41	RCSID("from: @(#)setjmp.s	5.1 (Berkeley) 5/12/90")
42#else
43	RCSID("$NetBSD: setjmp.S,v 1.14 2013/07/16 22:12:20 matt Exp $")
44#endif
45#endif /* LIBC_SCCS and not lint */
46
47/*
48 * C library -- setjmp, longjmp
49 *
50 *	longjmp(a,v)
51 * will generate a "return(v)" from
52 * the last call to
53 *	setjmp(a)
54 * by restoring registers from the stack,
55 * and a struct sigcontext, see <signal.h>
56 */
57
58ENTRY(__setjmp14)
59	/* Get signal stack info.  Note overlay of ss_sp and ss_size! */
60	lea	-12(%sp),%sp	/* sizeof(stack_t) */
61	clrl	(%sp)		/* ss = NULL */
62	movl	%sp,4(%sp)	/* oss = stack_t on stack */
63	jbsr	PIC_PLT(_C_LABEL(__sigaltstack14))
64
65	movl	8(%sp),%d0	/* ss_flags */
66	andl	#1,%d0		/* extract SS_ONSTACK */
67	lea	12(%sp),%sp	/* pop stack_t */
68
69	/* Get pointer to jmp_buf; a sigcontext is at the beginning. */
70	movl	4(%sp),%a0
71	movl	%d0,SC_ONSTACK(%a0) /* store onstack */
72	clrl	SC___MASK13(%a0) /* unused word (old style signal mask) */
73
74	/* Get the signal mask. */
75	pea	SC_MASK(%a0)	/* oset = &sc.sc_mask */
76	movl	#0,-(%sp)	/* set = NULL */
77	movl	#0,-(%sp)	/* action = 0 <ignored> */
78	jbsr	PIC_PLT(_C_LABEL(__sigprocmask14))
79	addl	#12,%sp
80
81	movl	4(%sp),%a0	/* get jmp_buf pointer again */
82	lea	4(%sp),%a1	/* adjust SP since we won't rts */
83	movl	%a1,SC_SP(%a0)	/* save SP */
84	movl	%a6,SC_FP(%a0)	/* save FP */
85	clrl	SC_AP(%a0)	/* no AP */
86	movl	(%sp),SC_PC(%a0)/* save return PC */
87	clrl	SC_PS(%a0)	/* clear PS */
88
89	/* Save remaining non-scratch regs after signal mask. */
90	moveml	#0x3CFC,SC_SIZE(%a0)
91
92	clrl	%d0		/* return 0 */
93	rts
94END(__setjmp14)
95