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_setjmp.S revision 1.1 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * the Systems Programming Group of the University of Utah Computer
      7  * Science Department.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  */
     37 
     38 #if defined(LIBC_SCCS) && !defined(lint)
     39 	.text
     40 	/*.asciz "from: @(#)_setjmp.s	5.1 (Berkeley) 5/12/90"*/
     41 	.asciz "$Id: _setjmp.S,v 1.1 1993/11/25 23:36:47 paulus Exp $"
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 /*
     45  * C library -- _setjmp, _longjmp
     46  *
     47  *	_longjmp(a,v)
     48  * will generate a "return(v)" from
     49  * the last call to
     50  *	_setjmp(a)
     51  * by restoring registers from the stack,
     52  * The previous signal state is NOT restored.
     53  */
     54 
     55 #include "DEFS.h"
     56 
     57 ENTRY(_setjmp)
     58 	movl	sp@(4),a0	/* save area pointer */
     59 	clrl	a0@+		/* no old onstack */
     60 	clrl	a0@+		/* no old sigmask */
     61 	movl	sp,a0@+		/* save old SP */
     62 	movl	a6,a0@+		/* save old FP */
     63 	clrl	a0@+		/* no old AP */
     64 	movl	sp@,a0@+	/* save old PC */
     65 	clrl	a0@+		/* clear PS */
     66 	moveml	#0x3CFC,a0@	/* save other non-scratch regs */
     67 	clrl	d0		/* return zero */
     68 	rts
     69 
     70 ENTRY(_longjmp)
     71 	movl	sp@(4),a0	/* save area pointer */
     72 	addql	#8,a0		/* skip onstack/sigmask */
     73 	tstl	a0@		/* ensure non-zero SP */
     74 	jeq	botch		/* oops! */
     75 	movl	sp@(8),d0	/* grab return value */
     76 	jne	ok		/* non-zero ok */
     77 	moveq	#1,d0		/* else make non-zero */
     78 ok:
     79 	movl	a0@+,sp		/* restore SP */
     80 	movl	a0@+,a6		/* restore FP */
     81 	addql	#4,a0		/* skip AP */
     82 	movl	a0@+,sp@	/* restore PC */
     83 	moveml	a0@(4),#0x3CFC	/* restore non-scratch regs */
     84 	rts
     85 
     86 botch:
     87 	jbsr	_longjmperror
     88 	stop	#0
     89