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root/usr/arch/x86/setjmp.S

DEFINITIONS

1. setjmp
2. longjmp

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * William Jolitz.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  33 /*
  34  * C library -- _setjmp, _longjmp
  35  *
  36  *      longjmp(a,v)
  37  * will generate a "return(v)" from the last call to
  38  *      setjmp(a)
  39  * by restoring registers from the stack.
  40  * The previous signal state is restored.
  41  */
  43 /* #include "DEFS.h" */
  44 #include <machine/asm.h>
ENTRY(setjmp)
  47         pushl   $0
  48         call    sigblock
  49         popl    %edx
  50         movl    4(%esp),%ecx
  51         movl    0(%esp),%edx
  52         movl    %edx, 0(%ecx)
  53         movl    %ebx, 4(%ecx)
  54         movl    %esp, 8(%ecx)
  55         movl    %ebp,12(%ecx)
  56         movl    %esi,16(%ecx)
  57         movl    %edi,20(%ecx)
  58         movl    %eax,24(%ecx)
  59         movl    $0,%eax
  60         ret
ENTRY(longjmp)
  63         movl    4(%esp),%edx
  64         pushl   24(%edx)
  65         call    sigsetmask
  66         popl    %eax
  67         movl    4(%esp),%edx
  68         movl    8(%esp),%eax
  69         movl    0(%edx),%ecx
  70         movl    4(%edx),%ebx
  71         movl    8(%edx),%esp
  72         movl    12(%edx),%ebp
  73         movl    16(%edx),%esi
  74         movl    20(%edx),%edi
  75         cmpl    $0,%eax
  76         jne     1f
  77         movl    $1,%eax
  78 1:      movl    %ecx,0(%esp)
  79         ret