osfmk/i386/_setjmp.s

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