sys/sys5/setjmp.c

	setjmp.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*  Copyright (c) 1988 AT&T */
/*  All Rights Reserved   */


/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"


#include <sys/setjmp.h>
#include "../common/ucontext.h"

int _getsp();

int
setjmp(env)
    jmp_buf env;
{
    register o_setjmp_struct_t *bp = (o_setjmp_struct_t *)env;
    register int sp = _getsp();
    ucontext_t uc;

    /*
     * Get the current machine context.
     */
    uc.uc_flags = UC_STACK;
    __getcontext(&uc);

    /*
     * Note that the pc and former sp (fp) from the stack are valid
     * because the call to __getcontext must flush the user windows
     * to the stack.
     */
    bp->sjs_flags = 0;
    bp->sjs_sp    = *((int *)sp+14);
    bp->sjs_pc    = *((int *)sp+15) + 0x8;
    bp->sjs_sigmask[0] = 0;
    bp->sjs_sigmask[1] = 0;
    bp->sjs_sigmask[2] = 0;
    bp->sjs_stack = uc.uc_stack;

    return (0);
}


void
longjmp(env, val)
    jmp_buf env;
    int val;
{
    o_setjmp_struct_t *bp = (o_setjmp_struct_t *)env;
    setjmp_struct_t sjmp, *sp;

    sp = &sjmp;
    sp->sjs_flags = bp->sjs_flags;
    sp->sjs_sp = bp->sjs_sp;
    sp->sjs_pc = bp->sjs_pc;
    sp->sjs_fp = 0;
    sp->sjs_i7 = 0;
    sp->sjs_uclink = 0;
    sp->sjs_sigmask[0] = bp->sjs_sigmask[0];
    sp->sjs_sigmask[1] = bp->sjs_sigmask[1];
    sp->sjs_sigmask[2] = bp->sjs_sigmask[2];
    sp->sjs_sigmask[3] = 0;
    sp->sjs_stack = bp->sjs_stack;
    _siglongjmp(sjmp, val);
}