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Annotation of XNU/osfmk/i386/_setjmp.s, revision 1.1

1.1     ! root        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  [email protected]
        !            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 <i386/asm.h>
        !            66: 
        !            67: ENTRY(_setjmp)
        !            68:        movl    4(%esp),%ecx            # fetch buffer
        !            69:        movl    %ebx,0(%ecx)
        !            70:        movl    %esi,4(%ecx)
        !            71:        movl    %edi,8(%ecx)
        !            72:        movl    %ebp,12(%ecx)           # save frame pointer of caller
        !            73:        popl    %edx
        !            74:        movl    %esp,16(%ecx)           # save stack pointer of caller
        !            75:        movl    %edx,20(%ecx)           # save pc of caller
        !            76:        xorl    %eax,%eax
        !            77:         jmp     *%edx
        !            78: 
        !            79: ENTRY(_longjmp)
        !            80:        movl    8(%esp),%eax            # return(v)
        !            81:        movl    4(%esp),%ecx            # fetch buffer
        !            82:        movl    0(%ecx),%ebx
        !            83:        movl    4(%ecx),%esi
        !            84:        movl    8(%ecx),%edi
        !            85:        movl    12(%ecx),%ebp
        !            86:        movl    16(%ecx),%esp
        !            87:        orl     %eax,%eax
        !            88:        jnz     0f
        !            89:        incl    %eax
        !            90: 0:     jmp     *20(%ecx)               # done, return....

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