79 lines
2.1 KiB
ArmAsm
79 lines
2.1 KiB
ArmAsm
/*-
|
|
* 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
|