bcopy.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 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 #include <i386/asm.h>
   57 
   58 /* void *memcpy((void *) to, (const void *) from, (size_t) bcount) */
   59 
   60 ENTRY(memcpy)
   61         pushl   %edi
   62         pushl   %esi
   63         movl    8+ 4(%esp),%edi         /* to */
   64         movl    %edi,%eax               /* returns its first argument */
   65         movl    8+ 8(%esp),%esi         /* from */
   66 memcpy_common:
   67         movl    8+ 12(%esp),%edx        /* number of bytes */
   68         cld
   69 /* move longs*/
   70         movl    %edx,%ecx
   71         sarl    $2,%ecx
   72         rep
   73         movsl
   74 /* move bytes*/
   75         movl    %edx,%ecx
   76         andl    $3,%ecx
   77         rep
   78         movsb
   79         popl    %esi
   80         popl    %edi
   81         ret
   82 
   83 /* void bcopy((const char *) from, (char *) to, (unsigned int) count) */
   84 
   85 ENTRY(bcopy_no_overwrite)
   86         pushl   %edi
   87         pushl   %esi
   88         movl    8+ 8(%esp),%edi         /* to */
   89         movl    8+ 4(%esp),%esi         /* from */
   90         jmp     memcpy_common
   91 
   92 /* bcopy16(from, to, bcount) using word moves */
   93 
   94 ENTRY(bcopy16)
   95         pushl   %edi
   96         pushl   %esi
   97         movl    8+12(%esp),%edx         /*  8 for the two pushes above */
   98         movl    8+ 8(%esp),%edi
   99         movl    8+ 4(%esp),%esi
  100 /* move words */
  101 0:      cld
  102         movl    %edx,%ecx
  103         sarl    $1,%ecx
  104         rep
  105         movsw
  106 /* move bytes */
  107         movl    %edx,%ecx
  108         andl    $1,%ecx
  109         rep
  110         movsb
  111         popl    %esi
  112         popl    %edi
  113         ret     
  114

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

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