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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(__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)
|
|
