bcopy.s

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        bcopy.s,v $
   29  * Revision 2.6  93/02/04  07:55:39  danner
   30  *      Convert asm comment "/" over to "/ *" "* /"
   31  *      [93/01/27            rvb]
   32  * 
   33  * Revision 2.5  91/05/14  16:03:58  mrt
   34  *      Correcting copyright
   35  * 
   36  * Revision 2.4  91/02/05  17:10:49  mrt
   37  *      Changed to new Mach copyright
   38  *      [91/02/01  17:30:41  mrt]
   39  * 
   40  * Revision 2.3  90/11/05  14:26:58  rpd
   41  *      Introduce bcopy16.  For 16bit copies to bus memory
   42  *      [90/11/02            rvb]
   43  * 
   44  * Revision 2.2  90/05/03  15:24:53  dbg
   45  *      From Bob Baron.
   46  *      [90/04/30            dbg]
   47  * 
   48  */
   49 
   50 #include <i386/asm.h>
   51 
   52 /* bcopy(from, to, bcount) */
   53 
   54 ENTRY(bcopy)
   55         pushl   %ebp
   56         movl    %esp,%ebp
   57         pushl   %edi
   58         pushl   %esi
   59         movl    B_ARG0,%esi
   60         movl    B_ARG1,%edi
   61 bcopy_common:
   62         movl    B_ARG2,%edx
   63         cld
   64 /* move longs */
   65         movl    %edx,%ecx
   66         sarl    $2,%ecx
   67         rep
   68         movsl
   69 /* move bytes */
   70         movl    %edx,%ecx
   71         andl    $3,%ecx
   72         rep
   73         movsb
   74         popl    %esi
   75         popl    %edi
   76         leave
   77         ret
   78 
   79 
   80 /* memcpy(to, from, count) */
   81 
   82 ENTRY(memcpy)
   83         pushl   %ebp
   84         movl    %esp,%ebp
   85         pushl   %edi
   86         pushl   %esi
   87         movl    B_ARG0,%edi
   88         movl    B_ARG1,%esi
   89         jmp     bcopy_common
   90 
   91 /* bcopy16(from, to, bcount) using word moves */
   92 
   93 ENTRY(bcopy16)
   94         pushl   %ebp
   95         movl    %esp,%ebp
   96         pushl   %edi
   97         pushl   %esi
   98 /*      movl    8+12(%esp),%edx         /  8 for the two pushes above */
   99 /*      movl    8+ 8(%esp),%edi */
  100 /*      movl    8+ 4(%esp),%esi */
  101         movl    B_ARG2, %edx
  102         movl    B_ARG1, %edi
  103         movl    B_ARG0, %esi
  104 /* move words */
  105 0:      cld
  106         movl    %edx,%ecx
  107         sarl    $1,%ecx
  108         rep
  109         movsw
  110 /* move bytes */
  111         movl    %edx,%ecx
  112         andl    $1,%ecx
  113         rep
  114         movsb
  115         popl    %esi
  116         popl    %edi
  117         leave
  118         ret     
  119

Cache object: 0b8a26660577192701d7c6c6dee03097

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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