105 строки
1.9 KiB
ArmAsm
105 строки
1.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
|
|
#include <linux/linkage.h>
|
|
#include "sysdep.h"
|
|
|
|
ENTRY(__memcpy)
|
|
ENTRY(memcpy)
|
|
/* Test if len less than 4 bytes. */
|
|
mov r12, r0
|
|
cmplti r2, 4
|
|
bt .L_copy_by_byte
|
|
|
|
andi r13, r0, 3
|
|
movi r19, 4
|
|
/* Test if dest is not 4 bytes aligned. */
|
|
bnez r13, .L_dest_not_aligned
|
|
|
|
/* Hardware can handle unaligned access directly. */
|
|
.L_dest_aligned:
|
|
/* If dest is aligned, then copy. */
|
|
zext r18, r2, 31, 4
|
|
|
|
/* Test if len less than 16 bytes. */
|
|
bez r18, .L_len_less_16bytes
|
|
movi r19, 0
|
|
|
|
LABLE_ALIGN
|
|
.L_len_larger_16bytes:
|
|
#if defined(__CK860__)
|
|
ldw r3, (r1, 0)
|
|
stw r3, (r0, 0)
|
|
ldw r3, (r1, 4)
|
|
stw r3, (r0, 4)
|
|
ldw r3, (r1, 8)
|
|
stw r3, (r0, 8)
|
|
ldw r3, (r1, 12)
|
|
addi r1, 16
|
|
stw r3, (r0, 12)
|
|
addi r0, 16
|
|
#else
|
|
ldw r20, (r1, 0)
|
|
ldw r21, (r1, 4)
|
|
ldw r22, (r1, 8)
|
|
ldw r23, (r1, 12)
|
|
stw r20, (r0, 0)
|
|
stw r21, (r0, 4)
|
|
stw r22, (r0, 8)
|
|
stw r23, (r0, 12)
|
|
PRE_BNEZAD (r18)
|
|
addi r1, 16
|
|
addi r0, 16
|
|
#endif
|
|
BNEZAD (r18, .L_len_larger_16bytes)
|
|
|
|
.L_len_less_16bytes:
|
|
zext r18, r2, 3, 2
|
|
bez r18, .L_copy_by_byte
|
|
.L_len_less_16bytes_loop:
|
|
ldw r3, (r1, 0)
|
|
PRE_BNEZAD (r18)
|
|
addi r1, 4
|
|
stw r3, (r0, 0)
|
|
addi r0, 4
|
|
BNEZAD (r18, .L_len_less_16bytes_loop)
|
|
|
|
/* Test if len less than 4 bytes. */
|
|
.L_copy_by_byte:
|
|
zext r18, r2, 1, 0
|
|
bez r18, .L_return
|
|
.L_copy_by_byte_loop:
|
|
ldb r3, (r1, 0)
|
|
PRE_BNEZAD (r18)
|
|
addi r1, 1
|
|
stb r3, (r0, 0)
|
|
addi r0, 1
|
|
BNEZAD (r18, .L_copy_by_byte_loop)
|
|
|
|
.L_return:
|
|
mov r0, r12
|
|
rts
|
|
|
|
/*
|
|
* If dest is not aligned, just copying some bytes makes the
|
|
* dest align.
|
|
*/
|
|
.L_dest_not_aligned:
|
|
sub r13, r19, r13
|
|
sub r2, r13
|
|
|
|
/* Makes the dest align. */
|
|
.L_dest_not_aligned_loop:
|
|
ldb r3, (r1, 0)
|
|
PRE_BNEZAD (r13)
|
|
addi r1, 1
|
|
stb r3, (r0, 0)
|
|
addi r0, 1
|
|
BNEZAD (r13, .L_dest_not_aligned_loop)
|
|
cmplti r2, 4
|
|
bt .L_copy_by_byte
|
|
|
|
/* Check whether the src is aligned. */
|
|
jbr .L_dest_aligned
|
|
ENDPROC(__memcpy)
|