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	version39-41:1.1;
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1.1
date	92.06.08.18.31.20;	author mwild;	state Exp;
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@initial checkin
@


1.1
log
@Initial revision
@
text
@/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
	.asciz "@@(#)_setjmp.s	5.1 (Berkeley) 5/12/90"
#endif /* LIBC_SCCS and not lint */

/*
 * C library -- _setjmp, _longjmp
 *
 *	_longjmp(a,v)
 * will generate a "return(v)" from
 * the last call to
 *	_setjmp(a)
 * by restoring registers from the stack,
 * The previous signal state is NOT restored.
 */

#include "DEFS.h"

ENTRY(_setjmp)
	movl	sp@@(4),a0	/* save area pointer */
	clrl	a0@@+		/* no old onstack */
	clrl	a0@@+		/* no old sigmask */
	movl	sp,a0@@+		/* save old SP */
	movl	a5,a0@@+		/* save old FP */
	clrl	a0@@+		/* no old AP */
	movl	sp@@,a0@@+	/* save old PC */
	clrl	a0@@+		/* clear PS */
	moveml	d2-d7/a2-a4/a6,a0@@	/* save other non-scratch regs */
	clrl	d0		/* return zero */
	rts

ENTRY(_longjmp)
	movl	sp@@(4),a0	/* save area pointer */
	addql	#8,a0		/* skip onstack/sigmask */
	tstl	a0@@		/* ensure non-zero SP */
	jeq	botch		/* oops! */
	movl	sp@@(8),d0	/* grab return value */
	jne	ok		/* non-zero ok */
	moveq	#1,d0		/* else make non-zero */
ok:
	movl	a0@@+,sp		/* restore SP */
	movl	a0@@+,a5		/* restore FP */
	addql	#4,a0		/* skip AP */
	movl	a0@@+,sp@@	/* restore PC */
	moveml	a0@@(4),d2-d7/a2-a4/a6	/* restore non-scratch regs */
	rts

botch:
	jsr	_longjmperror
	stop	#0
@