| Guo Ren | c5af58b | 2018-09-05 14:25:18 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| 3 | |
| 4 | #include <linux/linkage.h> |
| 5 | #include "sysdep.h" |
| 6 | |
| 7 | ENTRY(__memcpy) |
| 8 | ENTRY(memcpy) |
| 9 | /* Test if len less than 4 bytes. */ |
| 10 | mov r12, r0 |
| 11 | cmplti r2, 4 |
| 12 | bt .L_copy_by_byte |
| 13 | |
| 14 | andi r13, r0, 3 |
| 15 | movi r19, 4 |
| 16 | /* Test if dest is not 4 bytes aligned. */ |
| 17 | bnez r13, .L_dest_not_aligned |
| 18 | |
| 19 | /* Hardware can handle unaligned access directly. */ |
| 20 | .L_dest_aligned: |
| 21 | /* If dest is aligned, then copy. */ |
| 22 | zext r18, r2, 31, 4 |
| 23 | |
| 24 | /* Test if len less than 16 bytes. */ |
| 25 | bez r18, .L_len_less_16bytes |
| 26 | movi r19, 0 |
| 27 | |
| 28 | LABLE_ALIGN |
| 29 | .L_len_larger_16bytes: |
| Guo Ren | 35ff802 | 2018-12-31 01:19:29 +0800 | [diff] [blame] | 30 | #if defined(__CK860__) |
| Guo Ren | c5af58b | 2018-09-05 14:25:18 +0800 | [diff] [blame] | 31 | ldw r3, (r1, 0) |
| 32 | stw r3, (r0, 0) |
| 33 | ldw r3, (r1, 4) |
| 34 | stw r3, (r0, 4) |
| 35 | ldw r3, (r1, 8) |
| 36 | stw r3, (r0, 8) |
| 37 | ldw r3, (r1, 12) |
| 38 | addi r1, 16 |
| 39 | stw r3, (r0, 12) |
| 40 | addi r0, 16 |
| 41 | #else |
| 42 | ldw r20, (r1, 0) |
| 43 | ldw r21, (r1, 4) |
| 44 | ldw r22, (r1, 8) |
| 45 | ldw r23, (r1, 12) |
| 46 | stw r20, (r0, 0) |
| 47 | stw r21, (r0, 4) |
| 48 | stw r22, (r0, 8) |
| 49 | stw r23, (r0, 12) |
| 50 | PRE_BNEZAD (r18) |
| 51 | addi r1, 16 |
| 52 | addi r0, 16 |
| 53 | #endif |
| 54 | BNEZAD (r18, .L_len_larger_16bytes) |
| 55 | |
| 56 | .L_len_less_16bytes: |
| 57 | zext r18, r2, 3, 2 |
| 58 | bez r18, .L_copy_by_byte |
| 59 | .L_len_less_16bytes_loop: |
| 60 | ldw r3, (r1, 0) |
| 61 | PRE_BNEZAD (r18) |
| 62 | addi r1, 4 |
| 63 | stw r3, (r0, 0) |
| 64 | addi r0, 4 |
| 65 | BNEZAD (r18, .L_len_less_16bytes_loop) |
| 66 | |
| 67 | /* Test if len less than 4 bytes. */ |
| 68 | .L_copy_by_byte: |
| 69 | zext r18, r2, 1, 0 |
| 70 | bez r18, .L_return |
| 71 | .L_copy_by_byte_loop: |
| 72 | ldb r3, (r1, 0) |
| 73 | PRE_BNEZAD (r18) |
| 74 | addi r1, 1 |
| 75 | stb r3, (r0, 0) |
| 76 | addi r0, 1 |
| 77 | BNEZAD (r18, .L_copy_by_byte_loop) |
| 78 | |
| 79 | .L_return: |
| 80 | mov r0, r12 |
| 81 | rts |
| 82 | |
| 83 | /* |
| 84 | * If dest is not aligned, just copying some bytes makes the |
| 85 | * dest align. |
| 86 | */ |
| 87 | .L_dest_not_aligned: |
| 88 | sub r13, r19, r13 |
| 89 | sub r2, r13 |
| 90 | |
| 91 | /* Makes the dest align. */ |
| 92 | .L_dest_not_aligned_loop: |
| 93 | ldb r3, (r1, 0) |
| 94 | PRE_BNEZAD (r13) |
| 95 | addi r1, 1 |
| 96 | stb r3, (r0, 0) |
| 97 | addi r0, 1 |
| 98 | BNEZAD (r13, .L_dest_not_aligned_loop) |
| 99 | cmplti r2, 4 |
| 100 | bt .L_copy_by_byte |
| 101 | |
| 102 | /* Check whether the src is aligned. */ |
| 103 | jbr .L_dest_aligned |
| 104 | ENDPROC(__memcpy) |