minix/common/lib/libc/arch/arm/string/strlen_naive.S
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

74 lines
2.6 KiB
ArmAsm

/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
RCSID("$NetBSD: strlen_naive.S,v 1.8 2013/08/19 17:02:25 matt Exp $")
#ifdef STRNLEN
/* LINTSTUB: size_t strnlen(const char *, size_t) */
ENTRY(strnlen)
adds r3, r0, #1 /* start of src + NUL */
#ifdef __thumb__
adds r2, r0, r1 /* &src[maxlen] */
mov ip, r2
#else
adds ip, r0, r1 /* &src[maxlen] */
#endif
1: cmp r0, ip /* is this of string? */
beq 2f /* yes it is */
#ifdef __thumb__
ldrb r2, [r0] /* read a byte */
adds r0, r0, #1 /* advance to next byte */
#else
ldrb r2, [r0], #1 /* read a byte */
#endif
cmp r2, #0 /* is it a NUL? */
bne 1b /* no, get next byte */
subs r0, r0, r3 /* get difference between start and end */
RET /* return */
2: mov r0, r1 /* get maxlen */
RET /* return */
END(strnlen)
#else /* STRNLEN */
/* LINTSTUB: size_t strlen(const char *) */
ENTRY(strlen)
adds r3, r0, #1 /* start of src + NUL */
1:
#ifdef __thumb__
ldrb r2, [r0] /* read a byte */
adds r0, r0, #1
#else
ldrb r2, [r0], #1 /* read a byte */
#endif
cmp r2, #0 /* is it a NUL? */
bne 1b /* no, get next byte */
subs r0, r0, r3 /* return difference between start and end */
RET
END(strlen)
#endif /* !STRNLEN */