libsa/i386/setjmp.s

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