| /* 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) |
