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_setjmp.S revision 1.7 
      1 /*	$NetBSD: _setjmp.S,v 1.7 2004/03/23 16:13:27 pk Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <machine/asm.h>
     40 #include <machine/trap.h>
     41 
     42 #if defined(LIBC_SCCS) && !defined(lint)
     43 RCSID("$NetBSD: _setjmp.S,v 1.7 2004/03/23 16:13:27 pk Exp $")
     44 #endif /* LIBC_SCCS and not lint */
     45 
     46 /*
     47  * C library -- _setjmp, _longjmp
     48  *
     49  *	_longjmp(a,v)
     50  * will generate a "return(v?v:1)" from
     51  * the last call to
     52  *	_setjmp(a)
     53  * The previous signal state is NOT restored.
     54  */
     55 
     56 ENTRY(_setjmp)
     57 	st	%sp, [%o0+0]	/* store caller's stack pointer */
     58 	st	%o7, [%o0+4]	/* and the return pc */
     59 	retl
     60 	 clr	%o0		! return 0
     61 
     62 ENTRY(_longjmp)
     63 	sub	%sp, 64, %sp	! set up a local stack frame
     64 	tst	%o1		! compute v ? v : 1
     65 	be,a	0f
     66 	 mov	1, %o1
     67 0:
     68 	t	ST_FLUSHWIN	! flush register windows out to the stack
     69 
     70 	/*
     71 	 * We restore the saved stack pointer to %fp, then issue
     72 	 * a `restore' instruction which will reload the register
     73 	 * window from the stack.
     74 	 */
     75 	ld	[%o0+4], %o7	/* restore return pc */
     76 	ld	[%o0+0], %fp	/* and stack pointer */
     77 
     78 	retl			! success, return %o1
     79 	 restore	%o1, 0, %o0
     80