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/* $OpenBSD: _setjmp.S,v 1.2 2001/08/20 20:15:29 jason Exp $ */
/* $NetBSD: _setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $ */
/*
* 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.
*
* Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
*/
#if defined(LIBC_SCCS) && !defined(lint)
#ifdef notdef
.asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93"
#endif
.asciz "$NetBSD: _setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $"
#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)
btst 1, %sp
bne,a,pt %xcc, 1f ! 32 or 64-bit stack?
std %sp, [%o0+0] ! 32-bit stack pointer & return pc
stx %sp, [%o0+0] ! 64-bit stack pointer
stx %o7, [%o0+8] ! 64-bit return pc
stx %fp, [%o0+16] ! 64-bit frame pointer
retl
clr %o0
1:
st %fp, [%o0+8] ! 32-bit frame pointer
retl
clr %o0
ENTRY(_longjmp)
set 1, %g6
btst 1, %fp ! 32 or 64-bit stack?
movrz %o1, %o1, %g6 ! compute v ? v : 1 in a global register
bne,pt %xcc, 2f ! 64-bit
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
bne,pn %icc, Llongjmpbotch ! if there,
ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out
ba,a,pt %icc, 4f
2:
ldx [%g1+16], %g7 /* get caller's frame */
3:
cmp %fp, %g7 ! compare against desired frame
bl,a,pt %xcc, 3b ! if below,
restore ! pop frame and loop
bne,pn %xcc, Llongjmpbotch ! if there,
ldx [%g1+0], %o2 ! fetch return %sp and pc, and get out
ldx [%g1+8], %o3
4:
cmp %o2, %sp ! %sp must not decrease
blt,pn %icc, Llongjmpbotch
movge %icc, %o2, %sp ! it is OK, put it in place
jmp %o3 + 8 ! success, return %g6
mov %g6, %o0
Lbotch:
call _longjmperror ! otherwise, went too far; bomb out
nop
unimp 0
! otherwise, went too far; bomb out
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