103 lines
3.8 KiB
ArmAsm
103 lines
3.8 KiB
ArmAsm
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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RCSID("$NetBSD: strcpy_thumb.S,v 1.1 2013/08/20 21:32:50 matt Exp $")
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#ifdef _LIBC
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#ifdef STRLCPY
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WEAK_ALIAS(strlcpy, _strlcpy)
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#endif
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#include "namespace.h"
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#endif
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/*
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* These are "naive" versions of the str*cpy routines designed to be simple
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* and small.
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*/
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#if defined(STRLCPY)
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/* LINTSTUB: size_t strlcpy(char *, const char *, size_t) */
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ENTRY(strlcpy)
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adds r3, r1, #1 /* save src pointer (+ NUL) */
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subs r2, r2, #1 /* make sure there's room for a NUL */
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blt 3f /* no room, do the strlen */
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adds r2, r2, r0 /* get end of dst */
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subs r0, r0, r1 /* bias against r1 so one incr */
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1: cmp r0, r2 /* room for another char? */
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beq 2f /* no, write NUL and do the strlen */
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ldrb r3, [r1] /* read a byte */
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strb r3, [r0, r1] /* write a byte */
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adds r1, r1, #1 /* advance to next byte */
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cmp r3, #0 /* was it a NUL? */
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bne 1b /* no, do next byte */
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b 4f /* yes, end of string, so return */
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2: movs r3, #0 /* NUL */
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strb r3, [r0] /* write to end of string */
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3: ldrb r3, [r1] /* read a byte */
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adds r1, r1, #1 /* advance to next byte */
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cmp r3, #0 /* was it a NUL? */
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bne 3b /* no, get next byte */
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4: subs r0, r1, r3 /* return length of src string */
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RET
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END(strlcpy)
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#elif defined(STRNCPY)
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/* LINTSTUB: char * strncpy(char *, const char *, size_t) */
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ENTRY(strncpy)
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mov ip, r0 /* we want to preserve r0 */
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adds r2, r2, r0 /* get end of dst buffer */
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subs r1, r1, r0 /* allows to only increment once */
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1: cmp r0, r2 /* are at the end of dst already? */
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beq 3f /* yes, just return. */
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ldrb r3, [r1, r0] /* read a byte */
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strb r3, [r0] /* write a byte */
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adds r0, r0, #1 /* advance a byte */
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cmp r3, #0 /* was it a NUL? */
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bne 1b /* no, try next byte */
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2: cmp r0, r2 /* are at the end of dst already? */
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beq 3f /* yes, exit loop
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strb r3, [r0] /* write a NUL */
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adds r0, r0, #1 /* advance a bytes */
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b 2b /* until dst is filled */
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3: mov r0, ip /* return dst pointer */
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RET
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END(strncpy)
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#else
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/* LINTSTUB: char * strcpy(char *, const char *) */
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ENTRY(strcpy)
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subs r2, r0, r1 /* we want to preserve r0 */
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1: ldrb r3, [r1] /* read a byte */
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strb r3, [r2, r1] /* write a byte */
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adds r1, r1, #1 /* advance to next byte */
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cmp r3, #0 /* was it a NUL? */
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bne 1b /* no, try next byte */
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RET /* return dst pointer */
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END(strcpy)
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#endif
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