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 .weak memmove 8 ENTRY(__memmove) 9 ENTRY(memmove) 10 subu r3, r0, r1 11 cmphs r3, r2 12 bt memcpy 13 14 mov r12, r0 15 addu r0, r0, r2 16 addu r1, r1, r2 17 18 /* Test if len less than 4 bytes. */ 19 cmplti r2, 4 20 bt .L_copy_by_byte 21 22 andi r13, r0, 3 23 /* Test if dest is not 4 bytes aligned. */ 24 bnez r13, .L_dest_not_aligned 25 /* Hardware can handle unaligned access directly. */ 26 .L_dest_aligned: 27 /* If dest is aligned, then copy. */ 28 zext r18, r2, 31, 4 29 /* Test if len less than 16 bytes. */ 30 bez r18, .L_len_less_16bytes 31 movi r19, 0 32 33 /* len > 16 bytes */ 34 LABLE_ALIGN 35 .L_len_larger_16bytes: 36 subi r1, 16 37 subi r0, 16 38 #if defined(__CK860__) 39 ldw r3, (r1, 12) 40 stw r3, (r0, 12) 41 ldw r3, (r1, 8) 42 stw r3, (r0, 8) 43 ldw r3, (r1, 4) 44 stw r3, (r0, 4) 45 ldw r3, (r1, 0) 46 stw r3, (r0, 0) 47 #else 48 ldw r20, (r1, 0) 49 ldw r21, (r1, 4) 50 ldw r22, (r1, 8) 51 ldw r23, (r1, 12) 52 stw r20, (r0, 0) 53 stw r21, (r0, 4) 54 stw r22, (r0, 8) 55 stw r23, (r0, 12) 56 PRE_BNEZAD (r18) 57 #endif 58 BNEZAD (r18, .L_len_larger_16bytes) 59 60 .L_len_less_16bytes: 61 zext r18, r2, 3, 2 62 bez r18, .L_copy_by_byte 63 .L_len_less_16bytes_loop: 64 subi r1, 4 65 subi r0, 4 66 ldw r3, (r1, 0) 67 PRE_BNEZAD (r18) 68 stw r3, (r0, 0) 69 BNEZAD (r18, .L_len_less_16bytes_loop) 70 71 /* Test if len less than 4 bytes. */ 72 .L_copy_by_byte: 73 zext r18, r2, 1, 0 74 bez r18, .L_return 75 .L_copy_by_byte_loop: 76 subi r1, 1 77 subi r0, 1 78 ldb r3, (r1, 0) 79 PRE_BNEZAD (r18) 80 stb r3, (r0, 0) 81 BNEZAD (r18, .L_copy_by_byte_loop) 82 83 .L_return: 84 mov r0, r12 85 rts 86 87 /* If dest is not aligned, just copy some bytes makes the dest 88 align. */ 89 .L_dest_not_aligned: 90 sub r2, r13 91 .L_dest_not_aligned_loop: 92 subi r1, 1 93 subi r0, 1 94 /* Makes the dest align. */ 95 ldb r3, (r1, 0) 96 PRE_BNEZAD (r13) 97 stb r3, (r0, 0) 98 BNEZAD (r13, .L_dest_not_aligned_loop) 99 cmplti r2, 4 100 bt .L_copy_by_byte 101 /* Check whether the src is aligned. */ 102 jbr .L_dest_aligned 103 ENDPROC(memmove) 104 ENDPROC(__memmove)
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