1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
| */
|
| #include <linux/linkage.h>
|
| #ifdef __LITTLE_ENDIAN__
| # define SHIFT_1(RX,RY,IMM) asl RX, RY, IMM ; <<
| # define SHIFT_2(RX,RY,IMM) lsr RX, RY, IMM ; >>
| # define MERGE_1(RX,RY,IMM) asl RX, RY, IMM
| # define MERGE_2(RX,RY,IMM)
| # define EXTRACT_1(RX,RY,IMM) and RX, RY, 0xFFFF
| # define EXTRACT_2(RX,RY,IMM) lsr RX, RY, IMM
| #else
| # define SHIFT_1(RX,RY,IMM) lsr RX, RY, IMM ; >>
| # define SHIFT_2(RX,RY,IMM) asl RX, RY, IMM ; <<
| # define MERGE_1(RX,RY,IMM) asl RX, RY, IMM ; <<
| # define MERGE_2(RX,RY,IMM) asl RX, RY, IMM ; <<
| # define EXTRACT_1(RX,RY,IMM) lsr RX, RY, IMM
| # define EXTRACT_2(RX,RY,IMM) lsr RX, RY, 0x08
| #endif
|
| #ifdef CONFIG_ARC_HAS_LL64
| # define LOADX(DST,RX) ldd.ab DST, [RX, 8]
| # define STOREX(SRC,RX) std.ab SRC, [RX, 8]
| # define ZOLSHFT 5
| # define ZOLAND 0x1F
| #else
| # define LOADX(DST,RX) ld.ab DST, [RX, 4]
| # define STOREX(SRC,RX) st.ab SRC, [RX, 4]
| # define ZOLSHFT 4
| # define ZOLAND 0xF
| #endif
|
| ENTRY_CFI(memcpy)
| mov.f 0, r2
| ;;; if size is zero
| jz.d [blink]
| mov r3, r0 ; don;t clobber ret val
|
| ;;; if size <= 8
| cmp r2, 8
| bls.d @.Lsmallchunk
| mov.f lp_count, r2
|
| and.f r4, r0, 0x03
| rsub lp_count, r4, 4
| lpnz @.Laligndestination
| ;; LOOP BEGIN
| ldb.ab r5, [r1,1]
| sub r2, r2, 1
| stb.ab r5, [r3,1]
| .Laligndestination:
|
| ;;; Check the alignment of the source
| and.f r4, r1, 0x03
| bnz.d @.Lsourceunaligned
|
| ;;; CASE 0: Both source and destination are 32bit aligned
| ;;; Convert len to Dwords, unfold x4
| lsr.f lp_count, r2, ZOLSHFT
| lpnz @.Lcopy32_64bytes
| ;; LOOP START
| LOADX (r6, r1)
| LOADX (r8, r1)
| LOADX (r10, r1)
| LOADX (r4, r1)
| STOREX (r6, r3)
| STOREX (r8, r3)
| STOREX (r10, r3)
| STOREX (r4, r3)
| .Lcopy32_64bytes:
|
| and.f lp_count, r2, ZOLAND ;Last remaining 31 bytes
| .Lsmallchunk:
| lpnz @.Lcopyremainingbytes
| ;; LOOP START
| ldb.ab r5, [r1,1]
| stb.ab r5, [r3,1]
| .Lcopyremainingbytes:
|
| j [blink]
| ;;; END CASE 0
|
| .Lsourceunaligned:
| cmp r4, 2
| beq.d @.LunalignedOffby2
| sub r2, r2, 1
|
| bhi.d @.LunalignedOffby3
| ldb.ab r5, [r1, 1]
|
| ;;; CASE 1: The source is unaligned, off by 1
| ;; Hence I need to read 1 byte for a 16bit alignment
| ;; and 2bytes to reach 32bit alignment
| ldh.ab r6, [r1, 2]
| sub r2, r2, 2
| ;; Convert to words, unfold x2
| lsr.f lp_count, r2, 3
| MERGE_1 (r6, r6, 8)
| MERGE_2 (r5, r5, 24)
| or r5, r5, r6
|
| ;; Both src and dst are aligned
| lpnz @.Lcopy8bytes_1
| ;; LOOP START
| ld.ab r6, [r1, 4]
| ld.ab r8, [r1,4]
|
| SHIFT_1 (r7, r6, 24)
| or r7, r7, r5
| SHIFT_2 (r5, r6, 8)
|
| SHIFT_1 (r9, r8, 24)
| or r9, r9, r5
| SHIFT_2 (r5, r8, 8)
|
| st.ab r7, [r3, 4]
| st.ab r9, [r3, 4]
| .Lcopy8bytes_1:
|
| ;; Write back the remaining 16bits
| EXTRACT_1 (r6, r5, 16)
| sth.ab r6, [r3, 2]
| ;; Write back the remaining 8bits
| EXTRACT_2 (r5, r5, 16)
| stb.ab r5, [r3, 1]
|
| and.f lp_count, r2, 0x07 ;Last 8bytes
| lpnz @.Lcopybytewise_1
| ;; LOOP START
| ldb.ab r6, [r1,1]
| stb.ab r6, [r3,1]
| .Lcopybytewise_1:
| j [blink]
|
| .LunalignedOffby2:
| ;;; CASE 2: The source is unaligned, off by 2
| ldh.ab r5, [r1, 2]
| sub r2, r2, 1
|
| ;; Both src and dst are aligned
| ;; Convert to words, unfold x2
| lsr.f lp_count, r2, 3
| #ifdef __BIG_ENDIAN__
| asl.nz r5, r5, 16
| #endif
| lpnz @.Lcopy8bytes_2
| ;; LOOP START
| ld.ab r6, [r1, 4]
| ld.ab r8, [r1,4]
|
| SHIFT_1 (r7, r6, 16)
| or r7, r7, r5
| SHIFT_2 (r5, r6, 16)
|
| SHIFT_1 (r9, r8, 16)
| or r9, r9, r5
| SHIFT_2 (r5, r8, 16)
|
| st.ab r7, [r3, 4]
| st.ab r9, [r3, 4]
| .Lcopy8bytes_2:
|
| #ifdef __BIG_ENDIAN__
| lsr.nz r5, r5, 16
| #endif
| sth.ab r5, [r3, 2]
|
| and.f lp_count, r2, 0x07 ;Last 8bytes
| lpnz @.Lcopybytewise_2
| ;; LOOP START
| ldb.ab r6, [r1,1]
| stb.ab r6, [r3,1]
| .Lcopybytewise_2:
| j [blink]
|
| .LunalignedOffby3:
| ;;; CASE 3: The source is unaligned, off by 3
| ;;; Hence, I need to read 1byte for achieve the 32bit alignment
|
| ;; Both src and dst are aligned
| ;; Convert to words, unfold x2
| lsr.f lp_count, r2, 3
| #ifdef __BIG_ENDIAN__
| asl.ne r5, r5, 24
| #endif
| lpnz @.Lcopy8bytes_3
| ;; LOOP START
| ld.ab r6, [r1, 4]
| ld.ab r8, [r1,4]
|
| SHIFT_1 (r7, r6, 8)
| or r7, r7, r5
| SHIFT_2 (r5, r6, 24)
|
| SHIFT_1 (r9, r8, 8)
| or r9, r9, r5
| SHIFT_2 (r5, r8, 24)
|
| st.ab r7, [r3, 4]
| st.ab r9, [r3, 4]
| .Lcopy8bytes_3:
|
| #ifdef __BIG_ENDIAN__
| lsr.nz r5, r5, 24
| #endif
| stb.ab r5, [r3, 1]
|
| and.f lp_count, r2, 0x07 ;Last 8bytes
| lpnz @.Lcopybytewise_3
| ;; LOOP START
| ldb.ab r6, [r1,1]
| stb.ab r6, [r3,1]
| .Lcopybytewise_3:
| j [blink]
|
| END_CFI(memcpy)
|
|
