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Add an asm version of strlen() for arm (how useful).

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This commit is contained in:
Olivier Houchard 2005-10-03 14:21:49 +00:00
parent 9960ac47e9
commit 3507a15713
2 changed files with 78 additions and 1 deletions
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2
lib/libc/arm/string/Makefile.inc
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@ -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

77
lib/libc/arm/string/strlen.S Normal file
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@ -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