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| /* SPDX-License-Identifier: GPL-2.0 */
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
| #include <linux/linkage.h>
| #include "sysdep.h"
|
| ENTRY(strlen)
| /* Check if the start addr is aligned. */
| mov r3, r0
| andi r1, r0, 3
| movi r2, 4
| movi r0, 0
| bnez r1, .L_start_not_aligned
|
| LABLE_ALIGN
| .L_start_addr_aligned:
| /* Check if all the bytes in the word are not zero. */
| ldw r1, (r3)
| tstnbz r1
| bf .L_string_tail
|
| ldw r1, (r3, 4)
| addi r0, 4
| tstnbz r1
| bf .L_string_tail
|
| ldw r1, (r3, 8)
| addi r0, 4
| tstnbz r1
| bf .L_string_tail
|
| ldw r1, (r3, 12)
| addi r0, 4
| tstnbz r1
| bf .L_string_tail
|
| ldw r1, (r3, 16)
| addi r0, 4
| tstnbz r1
| bf .L_string_tail
|
| ldw r1, (r3, 20)
| addi r0, 4
| tstnbz r1
| bf .L_string_tail
|
| ldw r1, (r3, 24)
| addi r0, 4
| tstnbz r1
| bf .L_string_tail
|
| ldw r1, (r3, 28)
| addi r0, 4
| tstnbz r1
| bf .L_string_tail
|
| addi r0, 4
| addi r3, 32
| br .L_start_addr_aligned
|
| .L_string_tail:
| # ifdef __CSKYBE__
| xtrb0 r3, r1
| bez r3, .L_return
| addi r0, 1
| xtrb1 r3, r1
| bez r3, .L_return
| addi r0, 1
| xtrb2 r3, r1
| bez r3, .L_return
| addi r0, 1
| # else
| xtrb3 r3, r1
| bez r3, .L_return
| addi r0, 1
| xtrb2 r3, r1
| bez r3, .L_return
| addi r0, 1
| xtrb1 r3, r1
| bez r3, .L_return
| addi r0, 1
| # endif /* !__CSKYBE__ */
|
| .L_return:
| rts
|
| .L_start_not_aligned:
| sub r2, r2, r1
| .L_start_not_aligned_loop:
| ldb r1, (r3)
| PRE_BNEZAD (r2)
| addi r3, 1
| bez r1, .L_return
| addi r0, 1
| BNEZAD (r2, .L_start_not_aligned_loop)
| br .L_start_addr_aligned
| ENDPROC(strlen)
|
|
