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/* $OpenBSD: _setjmp.S,v 1.14 2016/09/22 18:23:58 guenther Exp $ */
/*-
* Copyright (c) 2002 Steve Murphree, Jr.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Steve Murphree, Jr.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "SYS.h"
/*
* C library -- _setjmp, _longjmp
*
* _longjmp(a,v)
* will generate a "return(v)" from the last call to
* _setjmp(a)
* by restoring registers from the stack. The previous signal state is
* neither saved nor restored.
*
* For m88k, we define our jmp_buf length to be the size of 21 (_JBLEN) longs.
* The buffer layout is as follows:
*
* jmp_buf[0] return address
* jmp_buf[1] unused
* jmp_buf[2 to 19] r14 to r31
* jmp_buf[20] setjmp type
*/
#define U_SETJMP_SIG 0x1764
/*
int _setjmp(jmp_buf env);
*/
ENTRY(_setjmp)
st %r1, %r2,0 /* save registers to the environment buffer */
st %r14,%r2,8
st %r15,%r2,12
st %r16,%r2,16
st %r17,%r2,20
st %r18,%r2,24
st %r19,%r2,28
st %r20,%r2,32
st %r21,%r2,36
st %r22,%r2,40
st %r23,%r2,44
st %r24,%r2,48
st %r25,%r2,52
st %r26,%r2,56
st %r27,%r2,60
st %r28,%r2,64
st %r29,%r2,68
st %r30,%r2,72
st %r31,%r2,76
or %r4,%r0,U_SETJMP_SIG /* setjmp type to _setjmp */
st %r4,%r2,80
jmp.n %r1
or %r2,%r0,0 /* return 0 */
END(_setjmp)
/*
void _longjmp(jmp_buf env, int val);
*/
ENTRY(_longjmp)
bcnd eq0,%r2,2f /* check for bad environment buffer address. */
ld %r4,%r2,80 /* check setjmp type. */
cmp %r4,%r4,U_SETJMP_SIG /* should be U_SETJMP_SIG */
bb1 ne,%r4,2f /* if != U_SETJMP_SIG, abort. */
ld %r14,%r2,8 /* restore registers from the environment buffer */
ld %r15,%r2,12
ld %r16,%r2,16
ld %r17,%r2,20
ld %r18,%r2,24
ld %r19,%r2,28
ld %r20,%r2,32
ld %r21,%r2,36
ld %r22,%r2,40
ld %r23,%r2,44
ld %r24,%r2,48
ld %r25,%r2,52
ld %r26,%r2,56
ld %r27,%r2,60
ld %r28,%r2,64
ld %r29,%r2,68
ld %r30,%r2,72
ld %r31,%r2,76
ld %r1,%r2,0 /* restore r1 */
bcnd.n ne0,%r3,1f
or %r2,%r3,%r0
or %r2,%r0,1 /* never return zero! */
1: jmp %r1
2: br _HIDDEN(abort) /* NO RETURN */
END(_longjmp)
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