sparc/gen/_setjmp.S

1.8    martin /*	$NetBSD: _setjmp.S,v 1.8 2008/04/28 20:22:57 martin Exp $	*/
1.4  christos
1.6        pk /*-
1.6        pk  * Copyright (c) 1999 The NetBSD Foundation, Inc.
1.6        pk  * All rights reserved.
1.1       cgd  *
1.6        pk  * This code is derived from software contributed to The NetBSD Foundation
1.6        pk  * by Paul Kranenburg.
1.1       cgd  *
1.1       cgd  * Redistribution and use in source and binary forms, with or without
1.1       cgd  * modification, are permitted provided that the following conditions
1.1       cgd  * are met:
1.1       cgd  * 1. Redistributions of source code must retain the above copyright
1.1       cgd  *    notice, this list of conditions and the following disclaimer.
1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
1.1       cgd  *    documentation and/or other materials provided with the distribution.
1.1       cgd  *
1.6        pk  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
1.6        pk  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.6        pk  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.6        pk  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
1.6        pk  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.6        pk  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.6        pk  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.6        pk  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.6        pk  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.6        pk  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.6        pk  * POSSIBILITY OF SUCH DAMAGE.
1.1       cgd  */
1.1       cgd
1.4  christos #include <machine/asm.h>
1.6        pk #include <machine/trap.h>
1.6        pk
1.1       cgd #if defined(LIBC_SCCS) && !defined(lint)
1.8    martin RCSID("$NetBSD: _setjmp.S,v 1.8 2008/04/28 20:22:57 martin Exp $")
1.1       cgd #endif /* LIBC_SCCS and not lint */
1.1       cgd
1.1       cgd /*
1.1       cgd  * C library -- _setjmp, _longjmp
1.1       cgd  *
1.1       cgd  *	_longjmp(a,v)
1.1       cgd  * will generate a "return(v?v:1)" from
1.1       cgd  * the last call to
1.1       cgd  *	_setjmp(a)
1.1       cgd  * The previous signal state is NOT restored.
1.1       cgd  */
1.1       cgd
1.1       cgd ENTRY(_setjmp)
1.2        pk 	st	%sp, [%o0+0]	/* store caller's stack pointer */
1.6        pk 	st	%o7, [%o0+4]	/* and the return pc */
1.1       cgd 	retl
1.1       cgd 	 clr	%o0		! return 0
1.1       cgd
1.1       cgd ENTRY(_longjmp)
1.6        pk 	sub	%sp, 64, %sp	! set up a local stack frame
1.6        pk 	tst	%o1		! compute v ? v : 1
1.1       cgd 	be,a	0f
1.6        pk 	 mov	1, %o1
1.1       cgd 0:
1.6        pk 	t	ST_FLUSHWIN	! flush register windows out to the stack
1.6        pk
1.6        pk 	/*
1.6        pk 	 * We restore the saved stack pointer to %fp, then issue
1.6        pk 	 * a `restore' instruction which will reload the register
1.6        pk 	 * window from the stack.
1.6        pk 	 */
1.6        pk 	ld	[%o0+4], %o7	/* restore return pc */
1.6        pk 	ld	[%o0+0], %fp	/* and stack pointer */
1.6        pk
1.7        pk 	retl			! success, return %o1
1.6        pk 	 restore	%o1, 0, %o0