1/* $OpenBSD: setjmp.S,v 1.16 2016/09/22 18:23:58 guenther Exp $ */
2/*-
3 * Copyright (c) 2002 Steve Murphree, Jr.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *      This product includes software developed by Steve Murphree, Jr.
17 * 4. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "SYS.h"
33
34/*
35 * C library -- setjmp, longjmp
36 *
37 *	longjmp(a,v)
38 * will generate a "return(v)" from the last call to
39 *	setjmp(a)
40 * by restoring registers from the stack, as well as the signal mask.
41 *
42 * For m88k, we define our jmp_buf length to be the size of 21 (_JBLEN) longs.
43 * The buffer layout is as follows:
44 *
45 * jmp_buf[0]		return address
46 * jmp_buf[1]		signal set
47 * jmp_buf[2 to 19]	r14 to r31
48 * jmp_buf[20]		setjmp type
49 */
50
51#define	SETJMP_SIG	0x5824
52
53/*
54int setjmp(jmp_buf env);
55 */
56ENTRY(setjmp)
57	st	%r1, %r2,0	/* save registers to the environment buffer */
58	st	%r14,%r2,8
59	st	%r15,%r2,12
60	st	%r16,%r2,16
61	st	%r17,%r2,20
62	st	%r18,%r2,24
63	st	%r19,%r2,28
64	st	%r20,%r2,32
65	st	%r21,%r2,36
66	st	%r22,%r2,40
67	st	%r23,%r2,44
68	st	%r24,%r2,48
69	st	%r25,%r2,52
70	st	%r26,%r2,56
71	st	%r27,%r2,60
72	st	%r28,%r2,64
73	st	%r29,%r2,68
74	st	%r30,%r2,72
75	st	%r31,%r2,76
76	or	%r4,%r0,SETJMP_SIG	/* r4 now contains setjmp type */
77	st	%r4,%r2,80	/* setjmp type to _setjmp */
78
79	or	%r4,%r2,0	/* save r2 in r4 */
80	or	%r3,%r0,0	/* set = empty */
81	or	%r2,%r0,1	/* how = SIG_BLOCK */
82	__DO_SYSCALL(sigprocmask)
83	or	%r0,%r0,%r0	/* NOP to fill error case of syscall */
84	st	%r2,%r4,4	/* save signal set in offset 4 of env */
85	ld	%r1,%r4,0
86
87	jmp.n	%r1		/* return 0 */
88	 or	%r2,%r0,0
89END(setjmp)
90
91/*
92void longjmp(jmp_buf env, int retval);
93 */
94ENTRY(longjmp)
95	bcnd	eq0,%r2,2f	/* check for bad environment buffer address. */
96	ld	%r4,%r2,80	/* check setjmp type. */
97	cmp	%r4,%r4,SETJMP_SIG	/* should be SETJMP_SIG */
98	bb1	ne,%r4,2f	/* if != SETJMP_SIG, abort. */
99
100	ld	%r14,%r2,8	/* restore registers from the environment buffer */
101	ld	%r15,%r2,12
102	ld	%r16,%r2,16
103	ld	%r17,%r2,20
104	ld	%r18,%r2,24
105	ld	%r19,%r2,28
106	ld	%r20,%r2,32
107	ld	%r21,%r2,36
108	ld	%r22,%r2,40
109	ld	%r23,%r2,44
110	ld	%r24,%r2,48
111	ld	%r25,%r2,52
112	ld	%r26,%r2,56
113	ld	%r27,%r2,60
114	ld	%r28,%r2,64
115	ld	%r29,%r2,68
116	ld	%r30,%r2,72
117	ld	%r31,%r2,76
118
119	or	%r4,%r2,0	/* save r2 in r4 */
120	or	%r5,%r3,0	/* and r3 in r5 */
121	ld	%r3,%r2,4	/* load the saved mask into r3 */
122	or	%r2,%r0,3	/* how = SIG_SETMASK */
123	__DO_SYSCALL(sigprocmask)
124	or	%r0,%r0,%r0	/* NOP to fill error case of syscall */
125
126	ld	%r1,%r4,0		/* restore r1 */
127	bcnd.n	ne0,%r5,1f
128	 or	%r2,%r5,%r0
129	or	%r2,%r0,1		/* never return zero! */
1301:	jmp	%r1
131
1322:	br	_HIDDEN(abort)	/* NO RETURN */
133END(longjmp)
134