71 lines
2.3 KiB
ArmAsm
71 lines
2.3 KiB
ArmAsm
/* $NetBSD: str.s,v 1.2 1996/08/02 16:18:40 ragge Exp $ */
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/*
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* Copyright (c) 1996 Ludd, University of Lule}, Sweden.
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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 at Ludd, University of
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* Lule}, Sweden and its contributors.
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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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/*
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* Small versions of the most common string functions not using any
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* emulated instructions.
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*/
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#include "../include/asm.h"
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ENTRY(strlen, 0);
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movl 4(ap), r0
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1: tstb (r0)+
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bneq 1b
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decl r0
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subl2 4(ap), r0
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ret
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ENTRY(strncmp, 0)
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movl 12(ap), r3
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brb 5f
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ENTRY(strcmp, 0)
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movl $250, r3 # max string len to compare
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5: movl 4(ap), r2
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movl 8(ap), r1
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movl $1, r0
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2: cmpb (r2),(r1)+
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bneq 1f # something differ
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tstb (r2)+
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beql 4f # continue, strings unequal
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decl r3 # max string len encountered?
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bneq 2b
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4: clrl r0 # We are done, strings equal.
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ret
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1: bgtr 3f
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mnegl r0, r0
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3: ret
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