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
220
221
222
223
224
225
226
227
228
229
230
| /* SPDX-License-Identifier: GPL-2.0-or-later */
| /*
| * Copyright (C) 2002 Paul Mackerras, IBM Corp.
| */
| #include <asm/processor.h>
| #include <asm/ppc_asm.h>
| #include <asm/export.h>
| #include <asm/asm-compat.h>
| #include <asm/feature-fixups.h>
| #include <asm/kasan.h>
|
| #ifndef SELFTEST_CASE
| /* For big-endian, 0 == most CPUs, 1 == POWER6, 2 == Cell */
| #define SELFTEST_CASE 0
| #endif
|
| .align 7
| _GLOBAL_TOC_KASAN(memcpy)
| BEGIN_FTR_SECTION
| #ifdef __LITTLE_ENDIAN__
| cmpdi cr7,r5,0
| #else
| std r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* save destination pointer for return value */
| #endif
| FTR_SECTION_ELSE
| #ifdef CONFIG_PPC_BOOK3S_64
| b memcpy_power7
| #endif
| ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
| #ifdef __LITTLE_ENDIAN__
| /* dumb little-endian memcpy that will get replaced at runtime */
| addi r9,r3,-1
| addi r4,r4,-1
| beqlr cr7
| mtctr r5
| 1: lbzu r10,1(r4)
| stbu r10,1(r9)
| bdnz 1b
| blr
| #else
| PPC_MTOCRF(0x01,r5)
| cmpldi cr1,r5,16
| neg r6,r3 # LS 3 bits = # bytes to 8-byte dest bdry
| andi. r6,r6,7
| dcbt 0,r4
| blt cr1,.Lshort_copy
| /* Below we want to nop out the bne if we're on a CPU that has the
| CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit
| cleared.
| At the time of writing the only CPU that has this combination of bits
| set is Power6. */
| test_feature = (SELFTEST_CASE == 1)
| BEGIN_FTR_SECTION
| nop
| FTR_SECTION_ELSE
| bne .Ldst_unaligned
| ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \
| CPU_FTR_UNALIGNED_LD_STD)
| .Ldst_aligned:
| addi r3,r3,-16
| test_feature = (SELFTEST_CASE == 0)
| BEGIN_FTR_SECTION
| andi. r0,r4,7
| bne .Lsrc_unaligned
| END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
| srdi r7,r5,4
| ld r9,0(r4)
| addi r4,r4,-8
| mtctr r7
| andi. r5,r5,7
| bf cr7*4+0,2f
| addi r3,r3,8
| addi r4,r4,8
| mr r8,r9
| blt cr1,3f
| 1: ld r9,8(r4)
| std r8,8(r3)
| 2: ldu r8,16(r4)
| stdu r9,16(r3)
| bdnz 1b
| 3: std r8,8(r3)
| beq 3f
| addi r3,r3,16
| .Ldo_tail:
| bf cr7*4+1,1f
| lwz r9,8(r4)
| addi r4,r4,4
| stw r9,0(r3)
| addi r3,r3,4
| 1: bf cr7*4+2,2f
| lhz r9,8(r4)
| addi r4,r4,2
| sth r9,0(r3)
| addi r3,r3,2
| 2: bf cr7*4+3,3f
| lbz r9,8(r4)
| stb r9,0(r3)
| 3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
| blr
|
| .Lsrc_unaligned:
| srdi r6,r5,3
| addi r5,r5,-16
| subf r4,r0,r4
| srdi r7,r5,4
| sldi r10,r0,3
| cmpdi cr6,r6,3
| andi. r5,r5,7
| mtctr r7
| subfic r11,r10,64
| add r5,r5,r0
|
| bt cr7*4+0,0f
|
| ld r9,0(r4) # 3+2n loads, 2+2n stores
| ld r0,8(r4)
| sld r6,r9,r10
| ldu r9,16(r4)
| srd r7,r0,r11
| sld r8,r0,r10
| or r7,r7,r6
| blt cr6,4f
| ld r0,8(r4)
| # s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12
| b 2f
|
| 0: ld r0,0(r4) # 4+2n loads, 3+2n stores
| ldu r9,8(r4)
| sld r8,r0,r10
| addi r3,r3,-8
| blt cr6,5f
| ld r0,8(r4)
| srd r12,r9,r11
| sld r6,r9,r10
| ldu r9,16(r4)
| or r12,r8,r12
| srd r7,r0,r11
| sld r8,r0,r10
| addi r3,r3,16
| beq cr6,3f
|
| # d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9
| 1: or r7,r7,r6
| ld r0,8(r4)
| std r12,8(r3)
| 2: srd r12,r9,r11
| sld r6,r9,r10
| ldu r9,16(r4)
| or r12,r8,r12
| stdu r7,16(r3)
| srd r7,r0,r11
| sld r8,r0,r10
| bdnz 1b
|
| 3: std r12,8(r3)
| or r7,r7,r6
| 4: std r7,16(r3)
| 5: srd r12,r9,r11
| or r12,r8,r12
| std r12,24(r3)
| beq 4f
| cmpwi cr1,r5,8
| addi r3,r3,32
| sld r9,r9,r10
| ble cr1,6f
| ld r0,8(r4)
| srd r7,r0,r11
| or r9,r7,r9
| 6:
| bf cr7*4+1,1f
| rotldi r9,r9,32
| stw r9,0(r3)
| addi r3,r3,4
| 1: bf cr7*4+2,2f
| rotldi r9,r9,16
| sth r9,0(r3)
| addi r3,r3,2
| 2: bf cr7*4+3,3f
| rotldi r9,r9,8
| stb r9,0(r3)
| 3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
| blr
|
| .Ldst_unaligned:
| PPC_MTOCRF(0x01,r6) # put #bytes to 8B bdry into cr7
| subf r5,r6,r5
| li r7,0
| cmpldi cr1,r5,16
| bf cr7*4+3,1f
| lbz r0,0(r4)
| stb r0,0(r3)
| addi r7,r7,1
| 1: bf cr7*4+2,2f
| lhzx r0,r7,r4
| sthx r0,r7,r3
| addi r7,r7,2
| 2: bf cr7*4+1,3f
| lwzx r0,r7,r4
| stwx r0,r7,r3
| 3: PPC_MTOCRF(0x01,r5)
| add r4,r6,r4
| add r3,r6,r3
| b .Ldst_aligned
|
| .Lshort_copy:
| bf cr7*4+0,1f
| lwz r0,0(r4)
| lwz r9,4(r4)
| addi r4,r4,8
| stw r0,0(r3)
| stw r9,4(r3)
| addi r3,r3,8
| 1: bf cr7*4+1,2f
| lwz r0,0(r4)
| addi r4,r4,4
| stw r0,0(r3)
| addi r3,r3,4
| 2: bf cr7*4+2,3f
| lhz r0,0(r4)
| addi r4,r4,2
| sth r0,0(r3)
| addi r3,r3,2
| 3: bf cr7*4+3,4f
| lbz r0,0(r4)
| stb r0,0(r3)
| 4: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
| blr
| #endif
| EXPORT_SYMBOL(memcpy)
| EXPORT_SYMBOL_KASAN(memcpy)
|
|
