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 8ENTRY(__memmove) 9ENTRY(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(__CSKY_VDSPV2__) 39 vldx.8 vr0, (r1), r19 40 PRE_BNEZAD (r18) 41 vstx.8 vr0, (r0), r19 42#elif defined(__CK860__) 43 ldw r3, (r1, 12) 44 stw r3, (r0, 12) 45 ldw r3, (r1, 8) 46 stw r3, (r0, 8) 47 ldw r3, (r1, 4) 48 stw r3, (r0, 4) 49 ldw r3, (r1, 0) 50 stw r3, (r0, 0) 51#else 52 ldw r20, (r1, 0) 53 ldw r21, (r1, 4) 54 ldw r22, (r1, 8) 55 ldw r23, (r1, 12) 56 stw r20, (r0, 0) 57 stw r21, (r0, 4) 58 stw r22, (r0, 8) 59 stw r23, (r0, 12) 60 PRE_BNEZAD (r18) 61#endif 62 BNEZAD (r18, .L_len_larger_16bytes) 63 64.L_len_less_16bytes: 65 zext r18, r2, 3, 2 66 bez r18, .L_copy_by_byte 67.L_len_less_16bytes_loop: 68 subi r1, 4 69 subi r0, 4 70 ldw r3, (r1, 0) 71 PRE_BNEZAD (r18) 72 stw r3, (r0, 0) 73 BNEZAD (r18, .L_len_less_16bytes_loop) 74 75 /* Test if len less than 4 bytes. */ 76.L_copy_by_byte: 77 zext r18, r2, 1, 0 78 bez r18, .L_return 79.L_copy_by_byte_loop: 80 subi r1, 1 81 subi r0, 1 82 ldb r3, (r1, 0) 83 PRE_BNEZAD (r18) 84 stb r3, (r0, 0) 85 BNEZAD (r18, .L_copy_by_byte_loop) 86 87.L_return: 88 mov r0, r12 89 rts 90 91 /* If dest is not aligned, just copy some bytes makes the dest 92 align. */ 93.L_dest_not_aligned: 94 sub r2, r13 95.L_dest_not_aligned_loop: 96 subi r1, 1 97 subi r0, 1 98 /* Makes the dest align. */ 99 ldb r3, (r1, 0) 100 PRE_BNEZAD (r13) 101 stb r3, (r0, 0) 102 BNEZAD (r13, .L_dest_not_aligned_loop) 103 cmplti r2, 4 104 bt .L_copy_by_byte 105 /* Check whether the src is aligned. */ 106 jbr .L_dest_aligned 107ENDPROC(memmove) 108ENDPROC(__memmove) 109