mirror of
https://github.com/autc04/Retro68.git
synced 2024-10-30 09:27:20 +00:00
51 lines
1.9 KiB
ArmAsm
51 lines
1.9 KiB
ArmAsm
|
/* Copyright (c) 2015 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:
|
||
|
|
* Redistributions of source code must retain the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer.
|
||
|
|
* 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.
|
||
|
|
* Neither the name of the Linaro nor the
|
||
|
|
names of its contributors may be used to endorse or promote products
|
||
|
|
derived from this software without specific prior written permission.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
||
|
|
HOLDER 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. */
|
||
|
|
|
||
|
|
.macro def_fn f p2align=0
|
||
|
|
.text
|
||
|
|
.p2align \p2align
|
||
|
|
.global \f
|
||
|
|
.type \f, %function
|
||
|
|
\f:
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.arch armv4t
|
||
|
|
.eabi_attribute Tag_also_compatible_with, "\006\013" /* ARMv6-M. */
|
||
|
|
.eabi_attribute Tag_ARM_ISA_use, 0
|
||
|
|
.thumb
|
||
|
|
.syntax unified
|
||
|
|
|
||
|
|
def_fn strlen p2align=1
|
||
|
|
movs r3, #0
|
||
|
|
1:
|
||
|
|
ldrb r2, [r0, r3]
|
||
|
|
adds r3, r3, #1
|
||
|
|
cmp r2, #0
|
||
|
|
bne 1b
|
||
|
|
subs r0, r3, #1
|
||
|
|
bx lr
|
||
|
|
.size strlen, . - strlen
|