121 lines
2.7 KiB
ArmAsm
121 lines
2.7 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_memset
|
|
.type __aeabi_memset, %function
|
|
ASM_ALIAS __aeabi_memset4 __aeabi_memset
|
|
ASM_ALIAS __aeabi_memset8 __aeabi_memset
|
|
__aeabi_memset:
|
|
push {r4, r5, r6, lr}
|
|
lsls r3, r0, #30
|
|
beq 10f
|
|
subs r4, r1, #1
|
|
cmp r1, #0
|
|
beq 9f
|
|
lsls r5, r2, #24
|
|
lsrs r5, r5, #24
|
|
movs r3, r0
|
|
movs r6, #3
|
|
b 2f
|
|
1:
|
|
subs r1, r4, #1
|
|
cmp r4, #0
|
|
beq 9f
|
|
movs r4, r1
|
|
2:
|
|
adds r3, r3, #1
|
|
subs r1, r3, #1
|
|
strb r5, [r1]
|
|
tst r3, r6
|
|
bne 1b
|
|
3:
|
|
cmp r4, #3
|
|
bls 7f
|
|
movs r5, #255
|
|
ands r5, r2
|
|
lsls r1, r5, #8
|
|
orrs r5, r1
|
|
lsls r1, r5, #16
|
|
orrs r5, r1
|
|
cmp r4, #15
|
|
bls 5f
|
|
movs r6, r4
|
|
subs r6, r6, #16
|
|
lsrs r6, r6, #4
|
|
adds r6, r6, #1
|
|
lsls r6, r6, #4
|
|
movs r1, r3
|
|
adds r3, r3, r6
|
|
4:
|
|
str r5, [r1]
|
|
str r5, [r1, #4]
|
|
str r5, [r1, #8]
|
|
str r5, [r1, #12]
|
|
adds r1, r1, #16
|
|
cmp r3, r1
|
|
bne 4b
|
|
movs r1, #15
|
|
ands r4, r1
|
|
cmp r4, #3
|
|
bls 7f
|
|
5:
|
|
subs r6, r4, #4
|
|
lsrs r6, r6, #2
|
|
adds r6, r6, #1
|
|
lsls r6, r6, #2
|
|
movs r1, r3
|
|
adds r3, r3, r6
|
|
6:
|
|
stmia r1!, {r5}
|
|
cmp r3, r1
|
|
bne 6b
|
|
movs r1, #3
|
|
ands r4, r1
|
|
7:
|
|
cmp r4, #0
|
|
beq 9f
|
|
lsls r2, r2, #24
|
|
lsrs r2, r2, #24
|
|
adds r4, r3, r4
|
|
8:
|
|
strb r2, [r3]
|
|
adds r3, r3, #1
|
|
cmp r4, r3
|
|
bne 8b
|
|
9:
|
|
pop {r4, r5, r6}
|
|
pop {r1}
|
|
bx r1
|
|
10:
|
|
movs r3, r0
|
|
movs r4, r1
|
|
b 3b
|
|
.size __aeabi_memset, . - __aeabi_memset
|