usr/src/lib/libbc/libc/sys/4.2/setjmp.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1988 AT&T */
  23 /*      All Rights Reserved   */
  24
  25
  26 /*
  27  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33
  34 #include <sys/setjmp.h>
  35 #include "../common/ucontext.h"
  36
  37 int _getsp();
  38
  39 int
  40 setjmp(env)
  41         jmp_buf env;
  42 {
  43         register o_setjmp_struct_t *bp = (o_setjmp_struct_t *)env;
  44         register int sp = _getsp();
  45         ucontext_t uc;
  46
  47         /*
  48          * Get the current machine context.
  49          */
  50         uc.uc_flags = UC_STACK | UC_SIGMASK;
  51         __getcontext(&uc);
  52
  53         /*
  54          * Note that the pc and former sp (fp) from the stack are valid
  55          * because the call to __getcontext must flush the user windows
  56          * to the stack.
  57          */
  58         bp->sjs_flags = 0;
  59         bp->sjs_sp    = *((int *)sp+14);
  60         bp->sjs_pc    = *((int *)sp+15) + 0x8;
  61         bp->sjs_stack = uc.uc_stack;
  62
  63         /* save the mask */
  64         bp->sjs_flags |= JB_SAVEMASK;
  65         memcpy(bp->sjs_sigmask, &(uc.uc_sigmask), 3 * sizeof (int));
  66
  67         return (0);
  68 }
  69
  70
  71
  72 void
  73 longjmp(env, val)
  74         jmp_buf env;
  75         int val;
  76 {
  77         o_setjmp_struct_t *bp = (o_setjmp_struct_t *)env;
  78         setjmp_struct_t sjmp, *sp;
  79
  80         sp = &sjmp;
  81         sp->sjs_flags = bp->sjs_flags;
  82         sp->sjs_sp = bp->sjs_sp;
  83         sp->sjs_pc = bp->sjs_pc;
  84         sp->sjs_fp = 0;
  85         sp->sjs_i7 = 0;
  86         sp->sjs_uclink = 0;
  87         sp->sjs_sigmask[0] = bp->sjs_sigmask[0];
  88         sp->sjs_sigmask[1] = bp->sjs_sigmask[1];
  89         sp->sjs_sigmask[2] = bp->sjs_sigmask[2];
  90         sp->sjs_sigmask[3] = 0;
  91         sp->sjs_stack = bp->sjs_stack;
  92         _siglongjmp(sjmp, val);
  93 }