projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 15637ed4 RG |
1 | /*- |
| 2 | * Copyright (c) 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * | |
| 7 | * Redistribution and use in source and binary forms, with or without | |
| 8 | * modification, are permitted provided that the following conditions | |
| 9 | * are met: | |
| 10 | * 1. Redistributions of source code must retain the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer. | |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 13 | * notice, this list of conditions and the following disclaimer in the | |
| 14 | * documentation and/or other materials provided with the distribution. | |
| 15 | * 3. All advertising materials mentioning features or use of this software | |
| 16 | * must display the following acknowledgement: | |
| 17 | * This product includes software developed by the University of | |
| 18 | * California, Berkeley and its contributors. | |
| 19 | * 4. Neither the name of the University nor the names of its contributors | |
| 20 | * may be used to endorse or promote products derived from this software | |
| 21 | * without specific prior written permission. | |
| 22 | * | |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 33 | * SUCH DAMAGE. | |
| 4649a470 | 34 | * |
| 04af8261 | 35 | * $Id: bcopy.s,v 1.2 1993/08/16 18:40:24 jtc Exp $ |
| 15637ed4 RG |
36 | */ |
| 37 | ||
| 38 | #if defined(LIBC_RCS) && !defined(lint) | |
| 04af8261 | 39 | .asciz "$Id: bcopy.s,v 1.2 1993/08/16 18:40:24 jtc Exp $" |
| 15637ed4 RG |
40 | #endif /* LIBC_RCS and not lint */ |
| 41 | ||
| 4649a470 C |
42 | #include "DEFS.h" |
| 43 | ||
| 15637ed4 RG |
44 | /* |
| 45 | * (ov)bcopy (src,dst,cnt) | |
| 46 | * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 | |
| 47 | */ | |
| 48 | ||
| 4649a470 | 49 | ENTRY(bcopy) |
| 15637ed4 RG |
50 | pushl %esi |
| 51 | pushl %edi | |
| 52 | movl 12(%esp),%esi | |
| 53 | movl 16(%esp),%edi | |
| 54 | movl 20(%esp),%ecx | |
| 55 | cmpl %esi,%edi /* potentially overlapping? */ | |
| 56 | jnb 1f | |
| 57 | cld /* nope, copy forwards. */ | |
| 58 | shrl $2,%ecx /* copy by words */ | |
| 59 | rep | |
| 60 | movsl | |
| 61 | movl 20(%esp),%ecx | |
| 62 | andl $3,%ecx /* any bytes left? */ | |
| 63 | rep | |
| 64 | movsb | |
| 65 | popl %edi | |
| 66 | popl %esi | |
| 15637ed4 RG |
67 | ret |
| 68 | 1: | |
| 69 | addl %ecx,%edi /* copy backwards. */ | |
| 70 | addl %ecx,%esi | |
| 71 | std | |
| 72 | andl $3,%ecx /* any fractional bytes? */ | |
| 73 | decl %edi | |
| 74 | decl %esi | |
| 75 | rep | |
| 76 | movsb | |
| 77 | movl 20(%esp),%ecx /* copy remainder by words */ | |
| 78 | shrl $2,%ecx | |
| 79 | subl $3,%esi | |
| 80 | subl $3,%edi | |
| 81 | rep | |
| 82 | movsl | |
| 83 | popl %edi | |
| 84 | popl %esi | |
| 15637ed4 RG |
85 | cld |
| 86 | ret |