osfmk/i386/_setjmp.s

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55
  56 /*
  57  * C library -- _setjmp, _longjmp
  58  *
  59  *      _longjmp(a,v)
  60  * will generate a "return(v)" from
  61  * the last call to
  62  *      _setjmp(a)
  63  * by restoring registers from the stack,
  64  * The previous signal state is NOT restored.
  65  *
  66  */
  67
  68 #include <i386/asm.h>
  69
  70 ENTRY(_setjmp)
  71         movl    4(%esp),%ecx            # fetch buffer
  72         movl    %ebx,0(%ecx)
  73         movl    %esi,4(%ecx)
  74         movl    %edi,8(%ecx)
  75         movl    %ebp,12(%ecx)           # save frame pointer of caller
  76         popl    %edx
  77         movl    %esp,16(%ecx)           # save stack pointer of caller
  78         movl    %edx,20(%ecx)           # save pc of caller
  79         xorl    %eax,%eax
  80         jmp     *%edx
  81
  82 ENTRY(_longjmp)
  83         movl    8(%esp),%eax            # return(v)
  84         movl    4(%esp),%ecx            # fetch buffer
  85         movl    0(%ecx),%ebx
  86         movl    4(%ecx),%esi
  87         movl    8(%ecx),%edi
  88         movl    12(%ecx),%ebp
  89         movl    16(%ecx),%esp
  90         orl     %eax,%eax
  91         jnz     0f
  92         incl    %eax
  93 0:      jmp     *20(%ecx)               # done, return....