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/* $OpenBSD: _setjmp.S,v 1.5 2008/05/21 20:39:32 miod Exp $ */
/*
* Copyright (c) 1980, 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,
* The previous signal state is NOT restored.
*/
#include "DEFS.h"
ENTRY(_setjmp, 0)
movl 4(ap),r0
movl 12(fp),(r0) # save frame pointer of caller
movl 16(fp),4(r0) # save pc of caller
clrl r0
ret
ENTRY(_longjmp, 0)
movl 8(ap),r0 # return(v)
movl 4(ap),r1 # fetch buffer
tstl (r1)
beql botch
loop:
bitw $1,6(fp) # r0 saved?
beql 1f
movl r0,20(fp)
bitw $2,6(fp) # was r1 saved?
beql 2f
movl r1,24(fp)
brb 2f
1:
bitw $2,6(fp) # was r1 saved?
beql 2f
movl r1,20(fp)
2:
cmpl (r1),12(fp)
beql done
blssu botch
movl $loop,16(fp)
ret # pop another frame
done:
cmpb *16(fp),reiins # returning to an "rei"?
bneq 1f
movab 3f,16(fp) # do return w/ psl-pc pop
brw 2f
1:
movab 4f,16(fp) # do standard return
2:
ret # unwind stack before signals enabled
3:
addl2 $8,sp # compensate for PSL-PC push
4:
jmp *4(r1) # done, return....
botch:
calls $0,_C_LABEL(longjmperror)
halt
.data
reiins: rei
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