diff options
author | cognet <cognet@FreeBSD.org> | 2005-10-03 14:21:49 +0000 |
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committer | cognet <cognet@FreeBSD.org> | 2005-10-03 14:21:49 +0000 |
commit | c1683d924885fc494086ce69137ceb379d89bb9c (patch) | |
tree | ecb38c9e6837c9c2f15aa56be5bdd96b31849685 | |
parent | 6acbf223159bb428ad260ae6abb9741273c48266 (diff) | |
download | FreeBSD-src-c1683d924885fc494086ce69137ceb379d89bb9c.zip FreeBSD-src-c1683d924885fc494086ce69137ceb379d89bb9c.tar.gz |
Add an asm version of strlen() for arm (how useful).
-rw-r--r-- | lib/libc/arm/string/Makefile.inc | 2 | ||||
-rw-r--r-- | lib/libc/arm/string/strlen.S | 77 |
2 files changed, 78 insertions, 1 deletions
diff --git a/lib/libc/arm/string/Makefile.inc b/lib/libc/arm/string/Makefile.inc index 7b73e58..6658ce7 100644 --- a/lib/libc/arm/string/Makefile.inc +++ b/lib/libc/arm/string/Makefile.inc @@ -3,5 +3,5 @@ MDSRCS+=bcmp.c bcopy.S bzero.S ffs.S index.c memchr.c memcmp.S memcpy.S \ memmove.S memset.S rindex.c strcat.c strchr.c strcmp.S strcpy.c \ - strlen.c strncmp.S strrchr.c swab.c wcschr.c wcscmp.c wcslen.c \ + strlen.S strncmp.S strrchr.c swab.c wcschr.c wcscmp.c wcslen.c \ wmemchr.c diff --git a/lib/libc/arm/string/strlen.S b/lib/libc/arm/string/strlen.S new file mode 100644 index 0000000..fa503e9 --- /dev/null +++ b/lib/libc/arm/string/strlen.S @@ -0,0 +1,77 @@ +/*- + * Copyright (c) 2005 Olivier Houchard + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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> +__FBSDID("$FreeBSD$"); + +ENTRY(strlen) + mov r1, #0 + /* Check that the pointer is aligned on 32 bits. */ + ands r3, r0, #3 + beq .Loop + sub r0, r0, r3 + ldr r2, [r0] + add r0, r0, #4 + cmp r3, #2 + blt .Ldo_3 + bgt .Ldo_1 + /* So that the N bit is set. */ + cmp r3, #0 + b .Ldo_2 + +.Loop: + ldr r2, [r0] + add r0, r0, #4 +#ifndef __ARMEB__ + ands r3, r2, #0x000000ff +#else + ands r3, r2, #0xff000000 +#endif + addne r1, r1, #1 +.Ldo_3: +#ifndef __ARMEB__ + andnes r3, r2, #0x0000ff00 +#else + andnes r3, r2, #0x00ff0000 +#endif + addne r1, r1, #1 +.Ldo_2: +#ifndef __ARMEB__ + andnes r3, r2, #0x00ff0000 +#else + andnes r3, r2, #0x0000ff00 +#endif + addne r1, r1, #1 +.Ldo_1: +#ifndef __ARMEB__ + andnes r3, r2, #0xff000000 +#else + andnes r3, r2, #0x000000ff +#endif + addne r1, r1, #1 + bne .Loop +.Lexit: + mov r0, r1 + RET |