1/*
2 * Copyright (c) 1980, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include "DEFS.h"
31
32#if defined(LIBC_SCCS) && !defined(lint)
33	/* .asciz "@(#)_setjmp.s	8.1 (Berkeley) 6/4/93" */
34RCSID("$NetBSD: _setjmp.S,v 1.11 2024/06/29 06:52:34 rin Exp $")
35#endif /* LIBC_SCCS and not lint */
36
37/*
38 * C library -- _setjmp, _longjmp
39 *
40 *	_longjmp(a,v)
41 * will generate a "return(v)" from
42 * the last call to
43 *	_setjmp(a)
44 * by restoring registers from the stack,
45 * The previous signal state is NOT restored.
46 *
47 * Even though we don't use sigreturn14, we still store things in a sigcontext
48 * in order to be consistent.
49 */
50
51ENTRY(_setjmp, R6)
52	movl	4(%ap),%r0
53	movl	12(%fp),12(%r0)		# save frame pointer of caller
54	movl	16(%fp),20(%r0)		# save pc of caller
55	movl	8(%fp),16(%r0)		# save ap of caller
56	clrl	%r1			# clear arg count
57	bbc	$13,6(%fp),1f		# was this a callg?
58	addl3	$1,(%ap),%r1		# get real arg count+1 for calls
591:	moval	24(%fp)[%r1],8(%r0)	# save sp of caller
60	movpsl	24(%r0)			# save current psl
61	movw	4(%fp),24(%r0)		# save psw of caller
62	movq	%r6,44(%r0)		# save r6/r7
63	movq	%r8,52(%r0)		# save r8/r9
64	movq	%r10,60(%r0)		# save r10/r11
65	clrl	%r0
66	ret
67END(_setjmp)
68
69ENTRY(_longjmp, 0)
70	movl	8(%ap),%r0		# return(v)
71	jneq	1f
72	movl	$1,%r0
731:	movl	4(%ap),%r1		# fetch buffer
74	tstl	12(%r1)			# is fp null
75	beql	botch
76	movq	44(%r1),%r6		# restore r6/r7
77	movq	52(%r1),%r8		# restore r8/r9
78	movq	60(%r1),%r10		# restore r10/r11
79	movl	16(%r1),%ap		# restore ap
80	movl	8(%r1),%sp		# restore sp
81	movl	12(%r1),%fp		# restore fp
82	movq	20(%r1),-(%sp)		# save pc/psl to new stack
83	rei				# and go back to saved pc/psl
84
85botch:
86	calls	$0,_C_LABEL(longjmperror)
87	halt
88END(_longjmp)
89