NetBSD/sys/lib/libkern/arch/sparc/_setjmp.S

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1994-10-26 09:39:02 +03:00
/* $NetBSD: _setjmp.S,v 1.2 1994/10/26 06:39:54 cgd Exp $ */
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/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
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* Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
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*/
#if defined(LIBC_SCCS) && !defined(lint)
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#ifdef notdef
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.asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93"
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#endif
.asciz "$NetBSD: _setjmp.S,v 1.2 1994/10/26 06:39:54 cgd Exp $"
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#endif /* LIBC_SCCS and not lint */
/*
* C library -- _setjmp, _longjmp
*
* _longjmp(a,v)
* will generate a "return(v?v:1)" from
* the last call to
* _setjmp(a)
* by unwinding the call stack.
* The previous signal state is NOT restored.
*/
#include "DEFS.h"
ENTRY(_setjmp)
std %sp, [%o0+0] /* caller's stack pointer and return pc */
st %fp, [%o0+8] /* store caller's frame pointer */
retl
clr %o0 ! return 0
ENTRY(_longjmp)
addcc %o1, %g0, %g6 ! compute v ? v : 1 in a global register
be,a 0f
mov 1, %g6
0:
mov %o0, %g1 ! save a in another global register
ld [%g1+8], %g7 /* get caller's frame */
1:
cmp %fp, %g7 ! compare against desired frame
bl,a 1b ! if below,
restore ! pop frame and loop
be,a 2f ! if there,
ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out
Lbotch:
call _longjmperror ! otherwise, went too far; bomb out
nop
unimp 0
2:
cmp %o2, %sp ! %sp must not decrease
bge,a 3f
mov %o2, %sp ! it is OK, put it in place
b,a Lbotch
3:
jmp %o3 + 8 ! success, return %g6
mov %g6, %o0