osfmk/i386/_setjmp.s

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * Mach Operating System
  35  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  36  * All Rights Reserved.
  37  *
  38  * Permission to use, copy, modify and distribute this software and its
  39  * documentation is hereby granted, provided that both the copyright
  40  * notice and this permission notice appear in all copies of the
  41  * software, derivative works or modified versions, and any portions
  42  * thereof, and that both notices appear in supporting documentation.
  43  *
  44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  46  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  47  *
  48  * Carnegie Mellon requests users of this software to return to
  49  *
  50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  51  *  School of Computer Science
  52  *  Carnegie Mellon University
  53  *  Pittsburgh PA 15213-3890
  54  *
  55  * any improvements or extensions that they make and grant Carnegie Mellon
  56  * the rights to redistribute these changes.
  57  */
  58 /*
  59  */
  60
  61 /*
  62  * C library -- _setjmp, _longjmp
  63  *
  64  *      _longjmp(a,v)
  65  * will generate a "return(v)" from
  66  * the last call to
  67  *      _setjmp(a)
  68  * by restoring registers from the stack,
  69  * The previous signal state is NOT restored.
  70  *
  71  */
  72
  73 #include <i386/asm.h>
  74
  75 ENTRY(_setjmp)
  76         movl    4(%esp),%ecx            # fetch buffer
  77         movl    %ebx,0(%ecx)
  78         movl    %esi,4(%ecx)
  79         movl    %edi,8(%ecx)
  80         movl    %ebp,12(%ecx)           # save frame pointer of caller
  81         popl    %edx
  82         movl    %esp,16(%ecx)           # save stack pointer of caller
  83         movl    %edx,20(%ecx)           # save pc of caller
  84         xorl    %eax,%eax
  85         jmp     *%edx
  86
  87 ENTRY(_longjmp)
  88         movl    8(%esp),%eax            # return(v)
  89         movl    4(%esp),%ecx            # fetch buffer
  90         movl    0(%ecx),%ebx
  91         movl    4(%ecx),%esi
  92         movl    8(%ecx),%edi
  93         movl    12(%ecx),%ebp
  94         movl    16(%ecx),%esp
  95         orl     %eax,%eax
  96         jnz     0f
  97         incl    %eax
  98 0:      jmp     *20(%ecx)               # done, return....