_setjmp.s

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    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....

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FreeBSD/Linux Kernel Cross Reference sys/osfmk/i386/_setjmp.s

FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/_setjmp.s