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/* $OpenBSD: setjmp.S,v 1.7 2005/08/07 16:40:15 espie Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* 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 "SYS.h"
ENTRY(setjmp, R6)
movl 4(ap),r6 # construct sigcontext
subl2 $12,sp # space for current struct sigstack
pushl sp # get current values
pushl $0 # no new values
calls $4,_C_LABEL(sigaltstack)# pop args plus signal stack value
movl (sp)+,(r6)+ # save onsigstack status of caller
pushl $0
calls $1,_C_LABEL(sigblock) # get signal mask
movl r0,(r6)+ # save signal mask of caller
movl (ap),r0
moval 4(ap)[r0],(r6)+ # save sp of caller
movl 12(fp),(r6)+ # save frame pointer of caller
movl 8(fp),(r6)+ # save argument pointer of caller
movl 16(fp),(r6)+ # save pc of caller
movpsl (r6) # save psl of caller
movw 4(fp),(r6)
clrl r0
ret
ENTRY(longjmp, R2)
movl 8(ap),r0 # return(v)
movl 4(ap),r1 # fetch buffer
tstl 12(r1)
beql botch
loop:
cmpl 12(r1),fp # are we there yet?
beql done
blssu botch
moval 20(fp),r2
blbc 6(fp),1f # was r0 saved?
movl r0,(r2)+
1:
bbc $1,6(fp),2f # was r1 saved?
movl r1,(r2)
2:
movl $loop,16(fp)
ret # pop another frame
done:
pushl r1 # pointer to sigcontext
calls $1,_C_LABEL(sigreturn) # restore previous context
# we should never return
botch:
calls $0,_C_LABEL(longjmperror)
halt
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