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: 30 #if defined(__CK860__) 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) 105