134 lines
3.2 KiB
ArmAsm
134 lines
3.2 KiB
ArmAsm
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/* $NetBSD: memcpy.S,v 1.3 2007/11/12 18:41:59 ad Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from locore.s.
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* Optimised by David Laight 2003
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: memcpy.S,v 1.3 2007/11/12 18:41:59 ad Exp $")
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#endif
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/*
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* (ov)bcopy (src,dst,cnt)
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* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
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*/
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#ifdef BCOPY
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ENTRY(bcopy)
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#else
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#ifdef MEMMOVE
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ENTRY(memmove)
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#else
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#define MEMCPY
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#define NO_OVERLAP
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ENTRY(memcpy)
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#endif
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#endif
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push %esi
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mov %edi,%edx
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#if defined(MEMCPY) || defined(MEMMOVE)
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movl 8(%esp),%edi
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movl 12(%esp),%esi
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#else
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movl 8(%esp),%esi
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movl 12(%esp),%edi
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#endif
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movl 16(%esp),%ecx
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#if defined(NO_OVERLAP)
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movl %ecx,%eax
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#else
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movl %edi,%eax
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subl %esi,%eax
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cmpl %ecx,%eax /* overlapping? */
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movl %ecx,%eax
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jb .Lbackwards
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#endif
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/* nope, copy forwards. */
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shrl $2,%ecx /* copy by words */
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rep
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movsl
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and $3,%eax /* any bytes left? */
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jnz .Ltrailing
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.Ldone:
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#if defined(MEMCPY) || defined(MEMMOVE)
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movl 8(%esp),%eax
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#endif
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mov %edx,%edi
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pop %esi
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ret
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.Ltrailing:
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cmp $2,%eax
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jb 1f
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movw (%esi),%ax
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movw %ax,(%edi)
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je .Ldone
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movb 2(%esi),%al
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movb %al,2(%edi)
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jmp .Ldone
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1: movb (%esi),%al
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movb %al,(%edi)
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jmp .Ldone
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#if !defined(NO_OVERLAP)
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.Lbackwards:
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addl %ecx,%edi /* copy backwards. */
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addl %ecx,%esi
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and $3,%eax /* any fractional bytes? */
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jnz .Lback_align
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.Lback_aligned:
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shrl $2,%ecx
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subl $4,%esi
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subl $4,%edi
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std
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rep
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movsl
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cld
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jmp .Ldone
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.Lback_align:
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sub %eax,%esi
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sub %eax,%edi
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cmp $2,%eax
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jb 1f
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je 2f
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movb 2(%esi),%al
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movb %al,2(%edi)
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2: movw (%esi),%ax
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movw %ax,(%edi)
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jmp .Lback_aligned
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1: movb (%esi),%al
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movb %al,(%edi)
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jmp .Lback_aligned
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#endif
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