mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-11 03:52:59 +00:00
66 lines
2.0 KiB
ArmAsm
66 lines
2.0 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:
|
|
* 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.
|
|
*/
|
|
|
|
.thumb
|
|
.syntax unified
|
|
.global __aeabi_memmove
|
|
.type __aeabi_memmove, %function
|
|
ASM_ALIAS __aeabi_memmove4 __aeabi_memmove
|
|
ASM_ALIAS __aeabi_memmove8 __aeabi_memmove
|
|
__aeabi_memmove:
|
|
cmp r0, r1
|
|
push {r4}
|
|
bls 3f
|
|
adds r3, r1, r2
|
|
cmp r0, r3
|
|
bcs 3f
|
|
adds r1, r0, r2
|
|
cbz r2, 2f
|
|
subs r2, r3, r2
|
|
1:
|
|
ldrb r4, [r3, #-1]!
|
|
cmp r2, r3
|
|
strb r4, [r1, #-1]!
|
|
bne 1b
|
|
2:
|
|
pop {r4}
|
|
bx lr
|
|
3:
|
|
cmp r2, #0
|
|
beq 2b
|
|
add r2, r2, r1
|
|
subs r3, r0, #1
|
|
4:
|
|
ldrb r4, [r1], #1
|
|
cmp r2, r1
|
|
strb r4, [r3, #1]!
|
|
bne 4b
|
|
pop {r4}
|
|
bx lr
|
|
.size __aeabi_memmove, . - __aeabi_memmove
|