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      1  1.9     matt /*	$NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt Exp $	*/
      2  1.2  thorpej 
      3  1.1   paulus /*-
      4  1.1   paulus  * Copyright (c) 1990 The Regents of the University of California.
      5  1.1   paulus  * All rights reserved.
      6  1.1   paulus  *
      7  1.1   paulus  * This code is derived from software contributed to Berkeley by
      8  1.1   paulus  * the Systems Programming Group of the University of Utah Computer
      9  1.1   paulus  * Science Department.
     10  1.1   paulus  *
     11  1.1   paulus  * Redistribution and use in source and binary forms, with or without
     12  1.1   paulus  * modification, are permitted provided that the following conditions
     13  1.1   paulus  * are met:
     14  1.1   paulus  * 1. Redistributions of source code must retain the above copyright
     15  1.1   paulus  *    notice, this list of conditions and the following disclaimer.
     16  1.1   paulus  * 2. Redistributions in binary form must reproduce the above copyright
     17  1.1   paulus  *    notice, this list of conditions and the following disclaimer in the
     18  1.1   paulus  *    documentation and/or other materials provided with the distribution.
     19  1.7      agc  * 3. Neither the name of the University nor the names of its contributors
     20  1.1   paulus  *    may be used to endorse or promote products derived from this software
     21  1.1   paulus  *    without specific prior written permission.
     22  1.1   paulus  *
     23  1.1   paulus  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  1.1   paulus  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  1.1   paulus  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  1.1   paulus  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  1.1   paulus  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  1.1   paulus  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  1.1   paulus  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  1.1   paulus  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  1.1   paulus  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  1.1   paulus  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  1.1   paulus  * SUCH DAMAGE.
     34  1.1   paulus  */
     35  1.1   paulus 
     36  1.3  thorpej #include <machine/asm.h>
     37  1.2  thorpej 
     38  1.1   paulus #if defined(LIBC_SCCS) && !defined(lint)
     39  1.2  thorpej #if 0
     40  1.2  thorpej 	RCSID("from: @(#)_setjmp.s	5.1 (Berkeley) 5/12/90")
     41  1.2  thorpej #else
     42  1.9     matt 	RCSID("$NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt Exp $")
     43  1.2  thorpej #endif
     44  1.1   paulus #endif /* LIBC_SCCS and not lint */
     45  1.1   paulus 
     46  1.1   paulus /*
     47  1.1   paulus  * C library -- _setjmp, _longjmp
     48  1.1   paulus  *
     49  1.1   paulus  *	_longjmp(a,v)
     50  1.1   paulus  * will generate a "return(v)" from
     51  1.1   paulus  * the last call to
     52  1.1   paulus  *	_setjmp(a)
     53  1.1   paulus  * by restoring registers from the stack,
     54  1.1   paulus  * The previous signal state is NOT restored.
     55  1.1   paulus  */
     56  1.1   paulus 
     57  1.1   paulus ENTRY(_setjmp)
     58  1.8     matt 	movl	4(%sp),%a0	/* save area pointer */
     59  1.8     matt 	clrl	(%a0)+		/* no old onstack */
     60  1.8     matt 	clrl	(%a0)+		/* no old sigmask */
     61  1.8     matt 	movl	%sp,(%a0)+	/* save old SP */
     62  1.8     matt 	movl	%a6,(%a0)+	/* save old FP */
     63  1.8     matt 	clrl	(%a0)+		/* no old AP */
     64  1.8     matt 	movl	(%sp),(%a0)+	/* save old PC */
     65  1.8     matt 	clrl	(%a0)+		/* clear PS */
     66  1.8     matt 	moveml	#0x3CFC,(%a0)	/* save other non-scratch regs */
     67  1.6  thorpej 	clrl	%d0		/* return zero */
     68  1.1   paulus 	rts
     69  1.9     matt END(_setjmp)
     70  1.1   paulus 
     71  1.1   paulus ENTRY(_longjmp)
     72  1.8     matt 	movl	4(%sp),%a0	/* save area pointer */
     73  1.6  thorpej 	addql	#8,%a0		/* skip onstack/sigmask */
     74  1.8     matt 	tstl	(%a0)		/* ensure non-zero SP */
     75  1.1   paulus 	jeq	botch		/* oops! */
     76  1.8     matt 	movl	8(%sp),%d0	/* grab return value */
     77  1.1   paulus 	jne	ok		/* non-zero ok */
     78  1.6  thorpej 	moveq	#1,%d0		/* else make non-zero */
     79  1.1   paulus ok:
     80  1.8     matt 	movl	(%a0)+,%sp	/* restore SP */
     81  1.8     matt 	movl	(%a0)+,%a6	/* restore FP */
     82  1.6  thorpej 	addql	#4,%a0		/* skip AP */
     83  1.8     matt 	movl	(%a0)+,(%sp)	/* restore PC */
     84  1.8     matt 	moveml	4(%a0),#0x3CFC	/* restore non-scratch regs */
     85  1.1   paulus 	rts
     86  1.1   paulus 
     87  1.1   paulus botch:
     88  1.5    itohy 	jbsr	PIC_PLT(_C_LABEL(longjmperror))
     89  1.1   paulus 	stop	#0
     90  1.9     matt END(_longjmp)
     91