diff options
| author |   drahn <drahn@openbsd.org> | 2004-02-01 05:30:40 +0000 |
|---|---|---|
| committer | drahn <drahn@openbsd.org> | 2004-02-01 05:30:40 +0000 |
| commit | d987040f0ee1d2fd1af421f1c0b499fb90b097aa (patch) | |
| tree | f7aea1ef74ded8cfa6d7dc13e688a5b1f6328f0d /lib/libc/arch/arm/string/memcmp.S | |
| parent | startup files for arm. Partially borrowed from NetBSD. (diff) | |
| download | wireguard-openbsd-d987040f0ee1d2fd1af421f1c0b499fb90b097aa.tar.xz wireguard-openbsd-d987040f0ee1d2fd1af421f1c0b499fb90b097aa.zip | |
arm libc support. From NetBSD. currently supports softfloat.
Diffstat (limited to 'lib/libc/arch/arm/string/memcmp.S')
| -rw-r--r-- | lib/libc/arch/arm/string/memcmp.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/lib/libc/arch/arm/string/memcmp.S b/lib/libc/arch/arm/string/memcmp.S new file mode 100644 index 00000000000..9ade675baa9 --- /dev/null +++ b/lib/libc/arch/arm/string/memcmp.S @@ -0,0 +1,50 @@ +/* $NetBSD: memcmp.S,v 1.2 2003/04/05 23:08:52 bjh21 Exp $ */ + +/* + * Copyright (c) 2002 ARM Ltd + * All rights reserved. + * + * 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. + * 3. The name of the company may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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: memcmp.S,v 1.2 2003/04/05 23:08:52 bjh21 Exp $") + +ENTRY(memcmp) +/* if ((len - 1) < 0) return 0 */ + subs r2, r2, #1 + movmi r0, #0 + movmi pc, lr + +/* ip == last src address to compare */ + add ip, r0, r2 +1: + ldrb r2, [r0], #1 + ldrb r3, [r1], #1 + cmp ip, r0 + cmpcs r2, r3 + beq 1b + sub r0, r2, r3 + mov pc, lr |