f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
90 lines
3 KiB
ArmAsm
90 lines
3 KiB
ArmAsm
/* $NetBSD: memcpy.S,v 1.3 2011/01/25 04:45:28 matt Exp $ */
|
|
/*-
|
|
* Copyright (c) 1990, 1993
|
|
* The 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.
|
|
* 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>
|
|
|
|
/* .asciz "@(#)memcpy.s 8.1 (Berkeley) 6/4/93" */
|
|
RCSID("$NetBSD: memcpy.S,v 1.3 2011/01/25 04:45:28 matt Exp $")
|
|
|
|
/*
|
|
* void *memcpy(dst, src, size)
|
|
* returns dst
|
|
*
|
|
* This optimises the usual case (count < 65536) at the expense
|
|
* of some extra memory references and branches when count >= 65536.
|
|
*/
|
|
|
|
ENTRY(memcpy, 0)
|
|
movzwl $65535,%r0 /* %r0 = 64K (needed below) */
|
|
movq 8(%ap),%r1 /* %r1 = src, %r2 = length */
|
|
movl 4(%ap),%r3 /* %r3 = dst */
|
|
cmpl %r1,%r3
|
|
bgtru 1f /* normal forward case */
|
|
beql 2f /* equal, nothing to do */
|
|
addl2 %r2,%r1 /* overlaps iff src<dst but src+len>dst */
|
|
cmpl %r1,%r3
|
|
bgtru 4f /* overlapping, must move backwards */
|
|
subl2 %r2,%r1
|
|
|
|
1: /* move forward */
|
|
cmpl %r2,%r0
|
|
bgtru 3f /* stupid movc3 limitation */
|
|
movc3 %r2,(%r1),(%r3) /* move it all */
|
|
2:
|
|
movl 4(%ap),%r0 /* return original dst */
|
|
ret
|
|
3:
|
|
subl2 %r0,12(%ap) /* adjust length by 64K */
|
|
movc3 %r0,(%r1),(%r3) /* move 64K */
|
|
movl 12(%ap),%r2
|
|
decw %r0 /* from 0 to 65535 */
|
|
brb 1b /* retry */
|
|
|
|
4: /* move backward */
|
|
addl2 %r2,%r3
|
|
5:
|
|
cmpl %r2,%r0
|
|
bgtru 6f /* stupid movc3 limitation */
|
|
subl2 %r2,%r1
|
|
subl2 %r2,%r3
|
|
movc3 %r2,(%r1),(%r3) /* move it all */
|
|
movl 4(%ap),%r0 /* return original dst */
|
|
ret
|
|
6:
|
|
subl2 %r0,12(%ap) /* adjust length by 64K */
|
|
subl2 %r0,%r1
|
|
subl2 %r0,%r3
|
|
movc3 %r0,(%r1),(%r3) /* move 64K */
|
|
movl 12(%ap),%r2
|
|
decw %r0
|
|
subl2 %r0,%r1
|
|
subl2 %r0,%r3
|
|
brb 5b
|
|
END(memcpy)
|