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_setjmp.S revision 1.2 
      1 /*	$NetBSD: _setjmp.S,v 1.2 1995/12/13 19:35:39 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * the Systems Programming Group of the University of Utah Computer
      9  * Science Department.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  */
     39 
     40 #include "DEFS.h"
     41 
     42 #if defined(LIBC_SCCS) && !defined(lint)
     43 #if 0
     44 	RCSID("from: @(#)_setjmp.s	5.1 (Berkeley) 5/12/90")
     45 #else
     46 	RCSID("$NetBSD: _setjmp.S,v 1.2 1995/12/13 19:35:39 thorpej Exp $")
     47 #endif
     48 #endif /* LIBC_SCCS and not lint */
     49 
     50 /*
     51  * C library -- _setjmp, _longjmp
     52  *
     53  *	_longjmp(a,v)
     54  * will generate a "return(v)" from
     55  * the last call to
     56  *	_setjmp(a)
     57  * by restoring registers from the stack,
     58  * The previous signal state is NOT restored.
     59  */
     60 
     61 ENTRY(_setjmp)
     62 	movl	sp@(4),a0	/* save area pointer */
     63 	clrl	a0@+		/* no old onstack */
     64 	clrl	a0@+		/* no old sigmask */
     65 	movl	sp,a0@+		/* save old SP */
     66 	movl	a6,a0@+		/* save old FP */
     67 	clrl	a0@+		/* no old AP */
     68 	movl	sp@,a0@+	/* save old PC */
     69 	clrl	a0@+		/* clear PS */
     70 	moveml	#0x3CFC,a0@	/* save other non-scratch regs */
     71 	clrl	d0		/* return zero */
     72 	rts
     73 
     74 ENTRY(_longjmp)
     75 	movl	sp@(4),a0	/* save area pointer */
     76 	addql	#8,a0		/* skip onstack/sigmask */
     77 	tstl	a0@		/* ensure non-zero SP */
     78 	jeq	botch		/* oops! */
     79 	movl	sp@(8),d0	/* grab return value */
     80 	jne	ok		/* non-zero ok */
     81 	moveq	#1,d0		/* else make non-zero */
     82 ok:
     83 	movl	a0@+,sp		/* restore SP */
     84 	movl	a0@+,a6		/* restore FP */
     85 	addql	#4,a0		/* skip AP */
     86 	movl	a0@+,sp@	/* restore PC */
     87 	moveml	a0@(4),#0x3CFC	/* restore non-scratch regs */
     88 	rts
     89 
     90 botch:
     91 	jbsr	_longjmperror
     92 	stop	#0
     93