b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
142 lines
4.8 KiB
ArmAsm
142 lines
4.8 KiB
ArmAsm
/* $NetBSD: bzero.S,v 1.2 2008/04/28 20:22:52 martin Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1997 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by J.T. Conklin.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* 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.
|
|
* 3. 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.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
RCSID("from: @(#)bzero.s 5.1 (Berkeley) 5/12/90")
|
|
#else
|
|
RCSID("$NetBSD: bzero.S,v 1.2 2008/04/28 20:22:52 martin Exp $")
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
ENTRY(bzero)
|
|
movl %d2,%sp@-
|
|
movl %sp@(8),%a0 | destination
|
|
movl %sp@(12),%d1 | count
|
|
|
|
movql #0,%d2
|
|
|
|
/*
|
|
* It isn't worth the overhead of aligning to {long}word boundries
|
|
* if the string is too short.
|
|
*/
|
|
cmpl #8,%d1
|
|
jlt Lbzbyte
|
|
|
|
/* word align */
|
|
movl %a0,%d0
|
|
btst #0,%d0 | if (dst & 1)
|
|
jeq Lbzalgndw |
|
|
movb %d2,%a0@+ | *(char *)dst++ = 0
|
|
subql #1,%d1 | len--
|
|
Lbzalgndw:
|
|
/* long word align */
|
|
btst #1,%d0 | if (dst & 2)
|
|
jeq Lbzalgndl |
|
|
movw %d2,%a0@+ | *(short *)dst++ = 0
|
|
subql #2,%d1 | len -= 2
|
|
Lbzalgndl:
|
|
/* zero by 8 longwords */
|
|
movel %d1,%d0
|
|
lsrl #5,%d0 | cnt = len / 32
|
|
jeq Lbzlong | if (cnt)
|
|
andl #31,%d1 | len %= 32
|
|
subql #1,%d0 | set up for dbf
|
|
Lbz32loop:
|
|
movl %d2,%a0@+ | zero 8 long words
|
|
movl %d2,%a0@+
|
|
movl %d2,%a0@+
|
|
movl %d2,%a0@+
|
|
movl %d2,%a0@+
|
|
movl %d2,%a0@+
|
|
movl %d2,%a0@+
|
|
movl %d2,%a0@+
|
|
dbf %d0,Lbz32loop | till done
|
|
clrw %d0
|
|
subql #1,%d0
|
|
jcc Lbz32loop
|
|
|
|
Lbzlong:
|
|
/* copy by longwords */
|
|
movel %d1,%d0
|
|
lsrl #2,%d0 | cnt = len / 4
|
|
jeq Lbzbyte | if (cnt)
|
|
subql #1,%d0 | set up for dbf
|
|
Lbzlloop:
|
|
movl %d2,%a0@+ | clear longwords
|
|
dbf %d0,Lbzlloop | till done
|
|
andl #3,%d1 | len %= 4
|
|
jeq Lbzdone
|
|
|
|
subql #1,%d1 | set up for dbf
|
|
Lbzbloop:
|
|
movb %d2,%a0@+ | zero bytes
|
|
Lbzbyte:
|
|
dbf %d1,Lbzbloop | till done
|
|
Lbzdone:
|
|
movl %sp@+,%d2
|
|
rts
|