libsa/i386/setjmp.s

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52
  53 /*
  54  * C library -- _setjmp, _longjmp
  55  *
  56  *      _longjmp(a,v)
  57  * will generate a "return(v)" from
  58  * the last call to
  59  *      _setjmp(a)
  60  * by restoring registers from the stack,
  61  * The previous signal state is NOT restored.
  62  *
  63  */
  64
  65 #include <mach/machine/asm.h>
  66
  67 .private_extern _setjmp
  68 .private_extern _longjmp
  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
  83 ENTRY(longjmp)
  84         movl    8(%esp),%eax            # return(v)
  85         movl    4(%esp),%ecx            # fetch buffer
  86         movl    0(%ecx),%ebx
  87         movl    4(%ecx),%esi
  88         movl    8(%ecx),%edi
  89         movl    12(%ecx),%ebp
  90         movl    16(%ecx),%esp
  91         orl     %eax,%eax
  92         jnz     0f
  93         incl    %eax
  94 0:      jmp     *20(%ecx)               # done, return....