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Annotation of XNU/osfmk/i386/bcopy.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 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: #include <i386/asm.h>
        !            54: 
        !            55: /* void *memcpy((void *) to, (const void *) from, (size_t) bcount) */
        !            56: 
        !            57: ENTRY(memcpy)
        !            58:        pushl   %edi
        !            59:        pushl   %esi
        !            60:        movl    8+ 4(%esp),%edi         /* to */
        !            61:        movl    %edi,%eax               /* returns its first argument */
        !            62:        movl    8+ 8(%esp),%esi         /* from */
        !            63: memcpy_common:
        !            64:        movl    8+ 12(%esp),%edx        /* number of bytes */
        !            65:        cld
        !            66: /* move longs*/
        !            67:        movl    %edx,%ecx
        !            68:        sarl    $2,%ecx
        !            69:        rep
        !            70:        movsl
        !            71: /* move bytes*/
        !            72:        movl    %edx,%ecx
        !            73:        andl    $3,%ecx
        !            74:        rep
        !            75:        movsb
        !            76:        popl    %esi
        !            77:        popl    %edi
        !            78:        ret
        !            79: 
        !            80: /* void bcopy((const char *) from, (char *) to, (unsigned int) count) */
        !            81: 
        !            82: ENTRY(bcopy)
        !            83:        pushl   %edi
        !            84:        pushl   %esi
        !            85:        movl    8+ 8(%esp),%edi         /* to */
        !            86:        movl    8+ 4(%esp),%esi         /* from */
        !            87:        jmp     memcpy_common
        !            88: 
        !            89: /* bcopy16(from, to, bcount) using word moves */
        !            90: 
        !            91: ENTRY(bcopy16)
        !            92:        pushl   %edi
        !            93:        pushl   %esi
        !            94:        movl    8+12(%esp),%edx         /*  8 for the two pushes above */
        !            95:        movl    8+ 8(%esp),%edi
        !            96:        movl    8+ 4(%esp),%esi
        !            97: /* move words */
        !            98: 0:     cld
        !            99:        movl    %edx,%ecx
        !           100:        sarl    $1,%ecx
        !           101:        rep
        !           102:        movsw
        !           103: /* move bytes */
        !           104:        movl    %edx,%ecx
        !           105:        andl    $1,%ecx
        !           106:        rep
        !           107:        movsb
        !           108:        popl    %esi
        !           109:        popl    %edi
        !           110:        ret     
        !           111: 

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