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_setjmp.S revision 1.7 
      1 /*	$NetBSD: _setjmp.S,v 1.7 2003/08/07 16:42:10 agc 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. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <machine/asm.h>
     37 
     38 #if defined(LIBC_SCCS) && !defined(lint)
     39 #if 0
     40 	RCSID("from: @(#)_setjmp.s	5.1 (Berkeley) 5/12/90")
     41 #else
     42 	RCSID("$NetBSD: _setjmp.S,v 1.7 2003/08/07 16:42:10 agc Exp $")
     43 #endif
     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)" from
     51  * the last call to
     52  *	_setjmp(a)
     53  * by restoring registers from the stack,
     54  * The previous signal state is NOT restored.
     55  */
     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	PIC_PLT(_C_LABEL(longjmperror))
     88 	stop	#0
     89