/* $OpenBSD: setjmp.S,v 1.9 2013/07/05 21:10:50 miod 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 */ #include "SYS.h" ENTRY(setjmp, R6) movl 4(%ap),%r6 # construct sigcontext subl2 $12,%sp # space for current struct sigaltstack 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