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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"
- .weak memset
- ENTRY(__memset)
- ENTRY(memset)
- /* Test if len less than 4 bytes. */
- mov r12, r0
- cmplti r2, 8
- bt .L_set_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:
- zextb r3, r1
- lsli r1, 8
- or r1, r3
- lsli r3, r1, 16
- or r3, r1
- /* If dest is aligned, then copy. */
- zext r18, r2, 31, 4
- /* Test if len less than 16 bytes. */
- bez r18, .L_len_less_16bytes
- LABLE_ALIGN
- .L_len_larger_16bytes:
- stw r3, (r0, 0)
- stw r3, (r0, 4)
- stw r3, (r0, 8)
- stw r3, (r0, 12)
- PRE_BNEZAD (r18)
- addi r0, 16
- BNEZAD (r18, .L_len_larger_16bytes)
- .L_len_less_16bytes:
- zext r18, r2, 3, 2
- andi r2, 3
- bez r18, .L_set_by_byte
- .L_len_less_16bytes_loop:
- stw r3, (r0, 0)
- PRE_BNEZAD (r18)
- addi r0, 4
- BNEZAD (r18, .L_len_less_16bytes_loop)
- /* Test if len less than 4 bytes. */
- .L_set_by_byte:
- zext r18, r2, 2, 0
- bez r18, .L_return
- .L_set_by_byte_loop:
- stb r1, (r0, 0)
- PRE_BNEZAD (r18)
- addi r0, 1
- BNEZAD (r18, .L_set_by_byte_loop)
- .L_return:
- mov r0, r12
- rts
- /* If dest is not aligned, just set some bytes makes the dest
- align. */
- .L_dest_not_aligned:
- sub r13, r19, r13
- sub r2, r13
- .L_dest_not_aligned_loop:
- /* Makes the dest align. */
- stb r1, (r0, 0)
- PRE_BNEZAD (r13)
- addi r0, 1
- BNEZAD (r13, .L_dest_not_aligned_loop)
- cmplti r2, 8
- bt .L_set_by_byte
- /* Check whether the src is aligned. */
- jbr .L_dest_aligned
- ENDPROC(memset)
- ENDPROC(__memset)
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