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compat_setjmp.S revision 1.1.50.1 
      1 /*	$NetBSD: compat_setjmp.S,v 1.1.50.1 2014/08/20 00:02:13 tls 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: compat_setjmp.S,v 1.1.50.1 2014/08/20 00:02:13 tls 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  * and a struct sigcontext, see <signal.h>
     55  */
     56 
     57 ENTRY(setjmp)
     58 	lea	-12(%sp),%sp	/* space for sigstack args/rvals */
     59 	clrl	(%sp)		/* don't change it... */
     60 	movl	%sp,4(%sp)	/* ...but return the current val */
     61 	jbsr	PIC_PLT(_C_LABEL(__sigaltstack14))
     62 				/* note: flags returned in sp@(8) */
     63 	clrl	(%sp)		/* don't change mask, just return */
     64 	jbsr	PIC_PLT(_C_LABEL(sigblock)) /*  old value */
     65 	movl	8(%sp),%d1	/* old flags value */
     66 	andl	#1,%d1		/* extract onstack flag */
     67 	lea	12(%sp),%sp
     68 	movl	4(%sp),%a0	/* save area pointer */
     69 	movl	%d1,(%a0)+	/* save old onstack value */
     70 	movl	%d0,(%a0)+	/* save old signal mask */
     71 	lea	4(%sp),%a1	/* adjust saved SP since we won't rts */
     72 	movl	%a1,(%a0)+	/* save old SP */
     73 	movl	%a6,(%a0)+	/* save old FP */
     74 	clrl	(%a0)+		/* no AP */
     75 	movl	(%sp),(%a0)+	/* save old PC */
     76 	clrl	(%a0)+		/* clean PS */
     77 	moveml	#0x3CFC,(%a0)	/* save remaining non-scratch regs */
     78 	clrl	%d0		/* return 0 */
     79 	rts
     80 END(setjmp)
     81 
     82 ENTRY(longjmp)
     83 	movl	4(%sp),%a0	/* save area pointer */
     84 	tstl	8(%a0)		/* ensure non-zero SP */
     85 	jeq	botch		/* oops! */
     86 	movl	8(%sp),%d0	/* grab return value */
     87 	jne	ok		/* non-zero ok */
     88 	moveq	#1,%d0		/* else make non-zero */
     89 ok:
     90 	moveml	28(%a0),#0x3CFC /* restore non-scratch regs */
     91 	movl	%a0,-(%sp)	/* let sigreturn */
     92 	trap	#1		/* finish via compat_13_sigreturn13() */
     93 
     94 botch:
     95 	jbsr	PIC_PLT(_C_LABEL(longjmperror))
     96 	stop	#0
     97 END(longjmp)
     98