90 lines
2.7 KiB
ArmAsm
90 lines
2.7 KiB
ArmAsm
/*
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* Copyright (c) 1993 Winning Strategies, Inc.
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* All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Winning Strategies, Inc.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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/*
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* strcpy (dst, src)
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* copy the string src to dst.
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*
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* Written by:
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* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
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*/
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/*
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* I've unrolled the loop eight times: large enough to make a
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* significant difference, and small enough not to totally trash the
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* cache.
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*/
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ENTRY(strcpy)
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movl 4(%esp),%ecx /* dst address */
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movl 8(%esp),%edx /* src address */
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pushl %ecx /* push dst address */
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.align 2,0x90
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L1: movb (%edx),%al /* unroll loop, but not too much */
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movb %al,(%ecx)
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testb %al,%al
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je L2
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movb 1(%edx),%al
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movb %al,1(%ecx)
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testb %al,%al
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je L2
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movb 2(%edx),%al
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movb %al,2(%ecx)
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testb %al,%al
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je L2
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movb 3(%edx),%al
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movb %al,3(%ecx)
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testb %al,%al
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je L2
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movb 4(%edx),%al
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movb %al,4(%ecx)
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testb %al,%al
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je L2
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movb 5(%edx),%al
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movb %al,5(%ecx)
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testb %al,%al
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je L2
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movb 6(%edx),%al
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movb %al,6(%ecx)
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testb %al,%al
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je L2
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movb 7(%edx),%al
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movb %al,7(%ecx)
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addl $8,%edx
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addl $8,%ecx
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testb %al,%al
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jne L1
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L2: popl %eax /* pop dst address */
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ret
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