1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* memmove.S: Simple memmove implementation. !! 2 /*
>> 3 * arch/alpha/lib/memmove.S
3 * 4 *
4 * Copyright (C) 1997, 2004 David S. Miller (d !! 5 * Barely optimized memmove routine for Alpha EV5.
5 * Copyright (C) 1996, 1997, 1998, 1999 Jakub !! 6 *
>> 7 * This is hand-massaged output from the original memcpy.c. We defer to
>> 8 * memcpy whenever possible; the backwards copy loops are not unrolled.
6 */ 9 */
>> 10 #include <asm/export.h>
>> 11 .set noat
>> 12 .set noreorder
>> 13 .text
7 14
8 #include <linux/export.h> !! 15 .align 4
9 #include <linux/linkage.h> !! 16 .globl memmove
>> 17 .ent memmove
>> 18 memmove:
>> 19 ldgp $29, 0($27)
>> 20 unop
>> 21 nop
>> 22 .prologue 1
>> 23
>> 24 addq $16,$18,$4
>> 25 addq $17,$18,$5
>> 26 cmpule $4,$17,$1 /* dest + n <= src */
>> 27 cmpule $5,$16,$2 /* dest >= src + n */
>> 28
>> 29 bis $1,$2,$1
>> 30 mov $16,$0
>> 31 xor $16,$17,$2
>> 32 bne $1,memcpy !samegp
>> 33
>> 34 and $2,7,$2 /* Test for src/dest co-alignment. */
>> 35 and $16,7,$1
>> 36 cmpule $16,$17,$3
>> 37 bne $3,$memmove_up /* dest < src */
>> 38
>> 39 and $4,7,$1
>> 40 bne $2,$misaligned_dn
>> 41 unop
>> 42 beq $1,$skip_aligned_byte_loop_head_dn
>> 43
>> 44 $aligned_byte_loop_head_dn:
>> 45 lda $4,-1($4)
>> 46 lda $5,-1($5)
>> 47 unop
>> 48 ble $18,$egress
>> 49
>> 50 ldq_u $3,0($5)
>> 51 ldq_u $2,0($4)
>> 52 lda $18,-1($18)
>> 53 extbl $3,$5,$1
>> 54
>> 55 insbl $1,$4,$1
>> 56 mskbl $2,$4,$2
>> 57 bis $1,$2,$1
>> 58 and $4,7,$6
>> 59
>> 60 stq_u $1,0($4)
>> 61 bne $6,$aligned_byte_loop_head_dn
>> 62
>> 63 $skip_aligned_byte_loop_head_dn:
>> 64 lda $18,-8($18)
>> 65 blt $18,$skip_aligned_word_loop_dn
>> 66
>> 67 $aligned_word_loop_dn:
>> 68 ldq $1,-8($5)
>> 69 nop
>> 70 lda $5,-8($5)
>> 71 lda $18,-8($18)
>> 72
>> 73 stq $1,-8($4)
>> 74 nop
>> 75 lda $4,-8($4)
>> 76 bge $18,$aligned_word_loop_dn
>> 77
>> 78 $skip_aligned_word_loop_dn:
>> 79 lda $18,8($18)
>> 80 bgt $18,$byte_loop_tail_dn
>> 81 unop
>> 82 ret $31,($26),1
>> 83
>> 84 .align 4
>> 85 $misaligned_dn:
>> 86 nop
>> 87 fnop
>> 88 unop
>> 89 beq $18,$egress
>> 90
>> 91 $byte_loop_tail_dn:
>> 92 ldq_u $3,-1($5)
>> 93 ldq_u $2,-1($4)
>> 94 lda $5,-1($5)
>> 95 lda $4,-1($4)
>> 96
>> 97 lda $18,-1($18)
>> 98 extbl $3,$5,$1
>> 99 insbl $1,$4,$1
>> 100 mskbl $2,$4,$2
>> 101
>> 102 bis $1,$2,$1
>> 103 stq_u $1,0($4)
>> 104 bgt $18,$byte_loop_tail_dn
>> 105 br $egress
>> 106
>> 107 $memmove_up:
>> 108 mov $16,$4
>> 109 mov $17,$5
>> 110 bne $2,$misaligned_up
>> 111 beq $1,$skip_aligned_byte_loop_head_up
>> 112
>> 113 $aligned_byte_loop_head_up:
>> 114 unop
>> 115 ble $18,$egress
>> 116 ldq_u $3,0($5)
>> 117 ldq_u $2,0($4)
>> 118
>> 119 lda $18,-1($18)
>> 120 extbl $3,$5,$1
>> 121 insbl $1,$4,$1
>> 122 mskbl $2,$4,$2
>> 123
>> 124 bis $1,$2,$1
>> 125 lda $5,1($5)
>> 126 stq_u $1,0($4)
>> 127 lda $4,1($4)
>> 128
>> 129 and $4,7,$6
>> 130 bne $6,$aligned_byte_loop_head_up
>> 131
>> 132 $skip_aligned_byte_loop_head_up:
>> 133 lda $18,-8($18)
>> 134 blt $18,$skip_aligned_word_loop_up
>> 135
>> 136 $aligned_word_loop_up:
>> 137 ldq $1,0($5)
>> 138 nop
>> 139 lda $5,8($5)
>> 140 lda $18,-8($18)
>> 141
>> 142 stq $1,0($4)
>> 143 nop
>> 144 lda $4,8($4)
>> 145 bge $18,$aligned_word_loop_up
>> 146
>> 147 $skip_aligned_word_loop_up:
>> 148 lda $18,8($18)
>> 149 bgt $18,$byte_loop_tail_up
>> 150 unop
>> 151 ret $31,($26),1
>> 152
>> 153 .align 4
>> 154 $misaligned_up:
>> 155 nop
>> 156 fnop
>> 157 unop
>> 158 beq $18,$egress
>> 159
>> 160 $byte_loop_tail_up:
>> 161 ldq_u $3,0($5)
>> 162 ldq_u $2,0($4)
>> 163 lda $18,-1($18)
>> 164 extbl $3,$5,$1
>> 165
>> 166 insbl $1,$4,$1
>> 167 mskbl $2,$4,$2
>> 168 bis $1,$2,$1
>> 169 stq_u $1,0($4)
>> 170
>> 171 lda $5,1($5)
>> 172 lda $4,1($4)
>> 173 nop
>> 174 bgt $18,$byte_loop_tail_up
>> 175
>> 176 $egress:
>> 177 ret $31,($26),1
>> 178 nop
>> 179 nop
>> 180 nop
10 181
11 .text !! 182 .end memmove
12 ENTRY(memmove) /* o0=dst o1=src o2=len */ !! 183 EXPORT_SYMBOL(memmove)
13 brz,pn %o2, 99f <<
14 mov %o0, %g1 <<
15 <<
16 cmp %o0, %o1 <<
17 bleu,pt %xcc, 2f <<
18 add %o1, %o2, %g7 <<
19 cmp %g7, %o0 <<
20 bleu,pt %xcc, memcpy <<
21 add %o0, %o2, %o5 <<
22 sub %g7, 1, %o1 <<
23 <<
24 sub %o5, 1, %o0 <<
25 1: ldub [%o1], %g7 <<
26 subcc %o2, 1, %o2 <<
27 sub %o1, 1, %o1 <<
28 stb %g7, [%o0] <<
29 bne,pt %icc, 1b <<
30 sub %o0, 1, %o0 <<
31 99: <<
32 retl <<
33 mov %g1, %o0 <<
34 <<
35 /* We can't just call memcpy for these <<
36 * chips the memcpy uses cache initial <<
37 * and src are close enough, those can <<
38 * before we've loaded it in. <<
39 */ <<
40 2: or %o0, %o1, %g7 <<
41 or %o2, %g7, %g7 <<
42 andcc %g7, 0x7, %g0 <<
43 bne,pn %xcc, 4f <<
44 nop <<
45 <<
46 3: ldx [%o1], %g7 <<
47 add %o1, 8, %o1 <<
48 subcc %o2, 8, %o2 <<
49 add %o0, 8, %o0 <<
50 bne,pt %icc, 3b <<
51 stx %g7, [%o0 - 0x8] <<
52 ba,a,pt %xcc, 99b <<
53 <<
54 4: ldub [%o1], %g7 <<
55 add %o1, 1, %o1 <<
56 subcc %o2, 1, %o2 <<
57 add %o0, 1, %o0 <<
58 bne,pt %icc, 4b <<
59 stb %g7, [%o0 - 0x1] <<
60 ba,a,pt %xcc, 99b <<
61 ENDPROC(memmove) <<
62 EXPORT_SYMBOL(memmove) <<
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