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/* $OpenBSD: setjmp.S,v 1.5 2011/11/22 21:13:30 guenther Exp $ */
/*-
* 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, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* 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,
* and a struct sigcontext, see <signal.h>
*/
#include "DEFS.h"
ENTRY(setjmp)
subl #12,sp /* space for sigaltstack args/rvals */
clrl sp@ /* don't change it... */
movl sp,sp@(4) /* ...but return the current val */
jbsr _sigaltstack /* note: flags returned in sp@(8) */
clrl sp@ /* don't change mask, just return */
jbsr _sigblock /* old value */
movl sp@(8),d1 /* old flags value */
andl #1,d1 /* extract onstack flag */
addl #12,sp
movl sp@(4),a0 /* save area pointer */
movl d1,a0@+ /* save old onstack value */
movl d0,a0@+ /* save old signal mask */
lea sp@(4),a1 /* adjust saved SP since we won't rts */
movl a1,a0@+ /* save old SP */
movl a6,a0@+ /* save old FP */
clrl a0@+ /* no AP */
movl sp@,a0@+ /* save old PC */
clrl a0@+ /* clean PS */
moveml #0x3CFC,a0@ /* save remaining non-scratch regs */
clrl d0 /* return 0 */
rts
ENTRY(longjmp)
movl sp@(4),a0 /* save area pointer */
tstl a0@(8) /* 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:
moveml a0@(28),#0x3CFC /* restore non-scratch regs */
movl a0,sp@- /* let sigreturn */
jbsr _sigreturn /* finish for us */
botch:
jbsr _longjmperror
stop #0
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