mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
75 lines
2.2 KiB
ArmAsm
75 lines
2.2 KiB
ArmAsm
|
/*
|
||
|
|
* Copyright (c) 1983 Regents of the University of California.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 4. Neither the name of the University nor the names of its contributors
|
||
|
|
* may be used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
.asciz "@(#)bcopy.s 5.6 (Berkeley) 6/1/90"
|
||
|
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
/* bcopy(from, to, size) */
|
||
|
|
|
||
|
|
#include "DEFS.h"
|
||
|
|
|
||
|
|
ENTRY(bcopy, R6)
|
||
|
|
movl 4(ap),r1
|
||
|
|
movl 8(ap),r3
|
||
|
|
movl 12(ap),r6
|
||
|
|
cmpl r1,r3
|
||
|
|
bgtr 2f # normal forward case
|
||
|
|
blss 3f # overlapping, must do backwards
|
||
|
|
ret # equal, nothing to do
|
||
|
|
1:
|
||
|
|
subl2 r0,r6
|
||
|
|
movc3 r0,(r1),(r3)
|
||
|
|
2:
|
||
|
|
movzwl $65535,r0
|
||
|
|
cmpl r6,r0
|
||
|
|
jgtr 1b
|
||
|
|
movc3 r6,(r1),(r3)
|
||
|
|
ret
|
||
|
|
3:
|
||
|
|
addl2 r6,r1
|
||
|
|
addl2 r6,r3
|
||
|
|
movzwl $65535,r0
|
||
|
|
jbr 5f
|
||
|
|
4:
|
||
|
|
subl2 r0,r6
|
||
|
|
subl2 r0,r1
|
||
|
|
subl2 r0,r3
|
||
|
|
movc3 r0,(r1),(r3)
|
||
|
|
movzwl $65535,r0
|
||
|
|
subl2 r0,r1
|
||
|
|
subl2 r0,r3
|
||
|
|
5:
|
||
|
|
cmpl r6,r0
|
||
|
|
jgtr 4b
|
||
|
|
subl2 r6,r1
|
||
|
|
subl2 r6,r3
|
||
|
|
movc3 r6,(r1),(r3)
|
||
|
|
ret
|