1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * arch/alpha/lib/memmove.S
4 *
5 * Barely optimized memmove routine for Alpha
6 *
7 * This is hand-massaged output from the origi
8 * memcpy whenever possible; the backwards cop
9 */
10 #include <linux/export.h>
11 .set noat
12 .set noreorder
13 .text
14
15 .align 4
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 /* de
27 cmpule $5,$16,$2 /* de
28
29 bis $1,$2,$1
30 mov $16,$0
31 xor $16,$17,$2
32 bne $1,memcpy !sameg
33
34 and $2,7,$2 /* Tes
35 and $16,7,$1
36 cmpule $16,$17,$3
37 bne $3,$memmove_up /* des
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
181
182 .end memmove
183 EXPORT_SYMBOL(memmove)
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.