128 lines
2.0 KiB
ArmAsm
128 lines
2.0 KiB
ArmAsm
|
/* The assembly function for string copy. C-SKY ABIV2 version.
|
||
|
|
Copyright (C) 2018-2022 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
The GNU C Library is free software; you can redistribute it and/or
|
||
|
|
modify it under the terms of the GNU Lesser General Public
|
||
|
|
License as published by the Free Software Foundation; either
|
||
|
|
version 2.1 of the License, or (at your option) any later version.
|
||
|
|
|
||
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public
|
||
|
|
License along with the GNU C Library. If not, see
|
||
|
|
<https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <sysdep.h>
|
||
|
|
|
||
|
|
ENTRY (strcpy)
|
||
|
|
mov a3, a0
|
||
|
|
/* Check if the src addr is aligned. */
|
||
|
|
andi t0, a1, 3
|
||
|
|
bnez t0, 11f
|
||
|
|
1:
|
||
|
|
/* Check if all the bytes in the word are not zero. */
|
||
|
|
ldw a2, (a1)
|
||
|
|
tstnbz a2
|
||
|
|
bf 9f
|
||
|
|
stw a2, (a3)
|
||
|
|
|
||
|
|
ldw a2, (a1, 4)
|
||
|
|
tstnbz a2
|
||
|
|
bf 2f
|
||
|
|
stw a2, (a3, 4)
|
||
|
|
|
||
|
|
ldw a2, (a1, 8)
|
||
|
|
tstnbz a2
|
||
|
|
bf 3f
|
||
|
|
stw a2, (a3, 8)
|
||
|
|
|
||
|
|
ldw a2, (a1, 12)
|
||
|
|
tstnbz a2
|
||
|
|
bf 4f
|
||
|
|
stw a2, (a3, 12)
|
||
|
|
|
||
|
|
ldw a2, (a1, 16)
|
||
|
|
tstnbz a2
|
||
|
|
bf 5f
|
||
|
|
stw a2, (a3, 16)
|
||
|
|
|
||
|
|
ldw a2, (a1, 20)
|
||
|
|
tstnbz a2
|
||
|
|
bf 6f
|
||
|
|
stw a2, (a3, 20)
|
||
|
|
|
||
|
|
ldw a2, (a1, 24)
|
||
|
|
tstnbz a2
|
||
|
|
bf 7f
|
||
|
|
stw a2, (a3, 24)
|
||
|
|
|
||
|
|
ldw a2, (a1, 28)
|
||
|
|
tstnbz a2
|
||
|
|
bf 8f
|
||
|
|
stw a2, (a3, 28)
|
||
|
|
|
||
|
|
addi a3, 32
|
||
|
|
addi a1, 32
|
||
|
|
br 1b
|
||
|
|
|
||
|
|
2:
|
||
|
|
addi a3, 4
|
||
|
|
br 9f
|
||
|
|
|
||
|
|
3:
|
||
|
|
addi a3, 8
|
||
|
|
br 9f
|
||
|
|
|
||
|
|
4:
|
||
|
|
addi a3, 12
|
||
|
|
br 9f
|
||
|
|
|
||
|
|
5:
|
||
|
|
addi a3, 16
|
||
|
|
br 9f
|
||
|
|
|
||
|
|
6:
|
||
|
|
addi a3, 20
|
||
|
|
br 9f
|
||
|
|
|
||
|
|
7:
|
||
|
|
addi a3, 24
|
||
|
|
br 9f
|
||
|
|
|
||
|
|
8:
|
||
|
|
addi a3, 28
|
||
|
|
9:
|
||
|
|
xtrb3 t0, a2
|
||
|
|
st.b t0, (a3)
|
||
|
|
bez t0, 10f
|
||
|
|
xtrb2 t0, a2
|
||
|
|
st.b t0, (a3, 1)
|
||
|
|
bez t0, 10f
|
||
|
|
xtrb1 t0, a2
|
||
|
|
st.b t0, (a3, 2)
|
||
|
|
bez t0, 10f
|
||
|
|
stw a2, (a3)
|
||
|
|
10:
|
||
|
|
jmp lr
|
||
|
|
|
||
|
|
11:
|
||
|
|
subi t0, 4
|
||
|
|
12:
|
||
|
|
ld.b a2, (a1)
|
||
|
|
st.b a2, (a3)
|
||
|
|
bez a2, 10b
|
||
|
|
addi t0, 1
|
||
|
|
addi a1, a1, 1
|
||
|
|
addi a3, a3, 1
|
||
|
|
bnez t0, 12b
|
||
|
|
br 1b
|
||
|
|
|
||
|
|
END (strcpy)
|
||
|
|
|
||
|
|
libc_hidden_def (strcpy)
|
||
|
|
.weak strcpy
|