minix/lib/libc/arch/sparc/gen/_setjmp.S

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/* $NetBSD: _setjmp.S,v 1.9 2011/04/30 23:41:12 martin Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <machine/asm.h>
#include <machine/trap.h>
#if defined(LIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: _setjmp.S,v 1.9 2011/04/30 23:41:12 martin 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)
* The previous signal state is NOT restored.
*/
ENTRY(_setjmp)
/* store important globals, sigsetjmp compatible */
st %g3, [%o0 + 16]
st %g2, [%o0 + 24]
st %g4, [%o0 + 48]
st %g7, [%o0 + 52]
st %sp, [%o0+0] /* store caller's stack pointer */
st %o7, [%o0+4] /* and the return pc */
retl
clr %o0 ! return 0
ENTRY(_longjmp)
sub %sp, 64, %sp ! set up a local stack frame
tst %o1 ! compute v ? v : 1
be,a 0f
mov 1, %o1
0:
t ST_FLUSHWIN ! flush register windows out to the stack
/* restore globals */
ld [%o0 + 16], %g3
ld [%o0 + 24], %g2
ld [%o0 + 48], %g4
ld [%o0 + 52], %g7
/*
* We restore the saved stack pointer to %fp, then issue
* a `restore' instruction which will reload the register
* window from the stack.
*/
ld [%o0+4], %o7 /* restore return pc */
ld [%o0+0], %fp /* and stack pointer */
retl ! success, return %o1
restore %o1, 0, %o0