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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
14cf11af | 2 | /* |
14cf11af | 3 | * Copyright (C) 2002 Paul Mackerras, IBM Corp. |
14cf11af PM |
4 | */ |
5 | #include <asm/processor.h> | |
6 | #include <asm/ppc_asm.h> | |
9445aa1a | 7 | #include <asm/export.h> |
ec0c464c | 8 | #include <asm/asm-compat.h> |
2c86cd18 | 9 | #include <asm/feature-fixups.h> |
26deb043 | 10 | #include <asm/kasan.h> |
14cf11af | 11 | |
98c45f51 PM |
12 | #ifndef SELFTEST_CASE |
13 | /* For big-endian, 0 == most CPUs, 1 == POWER6, 2 == Cell */ | |
14 | #define SELFTEST_CASE 0 | |
15 | #endif | |
16 | ||
14cf11af | 17 | .align 7 |
26deb043 | 18 | _GLOBAL_TOC_KASAN(memcpy) |
b3f271e8 | 19 | BEGIN_FTR_SECTION |
00f554fa PB |
20 | #ifdef __LITTLE_ENDIAN__ |
21 | cmpdi cr7,r5,0 | |
22 | #else | |
752a6422 | 23 | std r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* save destination pointer for return value */ |
00f554fa | 24 | #endif |
b3f271e8 | 25 | FTR_SECTION_ELSE |
15a3204d | 26 | #ifdef CONFIG_PPC_BOOK3S_64 |
b3f271e8 | 27 | b memcpy_power7 |
22d651dc | 28 | #endif |
b3f271e8 | 29 | ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY) |
00f554fa PB |
30 | #ifdef __LITTLE_ENDIAN__ |
31 | /* dumb little-endian memcpy that will get replaced at runtime */ | |
32 | addi r9,r3,-1 | |
33 | addi r4,r4,-1 | |
34 | beqlr cr7 | |
35 | mtctr r5 | |
36 | 1: lbzu r10,1(r4) | |
37 | stbu r10,1(r9) | |
38 | bdnz 1b | |
39 | blr | |
40 | #else | |
86e32fdc | 41 | PPC_MTOCRF(0x01,r5) |
14cf11af PM |
42 | cmpldi cr1,r5,16 |
43 | neg r6,r3 # LS 3 bits = # bytes to 8-byte dest bdry | |
44 | andi. r6,r6,7 | |
45 | dcbt 0,r4 | |
46 | blt cr1,.Lshort_copy | |
25d6e2d7 MN |
47 | /* Below we want to nop out the bne if we're on a CPU that has the |
48 | CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit | |
49 | cleared. | |
50 | At the time of writing the only CPU that has this combination of bits | |
51 | set is Power6. */ | |
98c45f51 | 52 | test_feature = (SELFTEST_CASE == 1) |
25d6e2d7 MN |
53 | BEGIN_FTR_SECTION |
54 | nop | |
55 | FTR_SECTION_ELSE | |
14cf11af | 56 | bne .Ldst_unaligned |
25d6e2d7 MN |
57 | ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \ |
58 | CPU_FTR_UNALIGNED_LD_STD) | |
14cf11af | 59 | .Ldst_aligned: |
14cf11af | 60 | addi r3,r3,-16 |
98c45f51 | 61 | test_feature = (SELFTEST_CASE == 0) |
25d6e2d7 MN |
62 | BEGIN_FTR_SECTION |
63 | andi. r0,r4,7 | |
14cf11af | 64 | bne .Lsrc_unaligned |
25d6e2d7 | 65 | END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD) |
14cf11af PM |
66 | srdi r7,r5,4 |
67 | ld r9,0(r4) | |
68 | addi r4,r4,-8 | |
69 | mtctr r7 | |
70 | andi. r5,r5,7 | |
71 | bf cr7*4+0,2f | |
72 | addi r3,r3,8 | |
73 | addi r4,r4,8 | |
74 | mr r8,r9 | |
75 | blt cr1,3f | |
76 | 1: ld r9,8(r4) | |
77 | std r8,8(r3) | |
78 | 2: ldu r8,16(r4) | |
79 | stdu r9,16(r3) | |
80 | bdnz 1b | |
81 | 3: std r8,8(r3) | |
d0027bf0 | 82 | beq 3f |
14cf11af | 83 | addi r3,r3,16 |
14cf11af PM |
84 | .Ldo_tail: |
85 | bf cr7*4+1,1f | |
e423b9ec MN |
86 | lwz r9,8(r4) |
87 | addi r4,r4,4 | |
14cf11af PM |
88 | stw r9,0(r3) |
89 | addi r3,r3,4 | |
90 | 1: bf cr7*4+2,2f | |
e423b9ec MN |
91 | lhz r9,8(r4) |
92 | addi r4,r4,2 | |
14cf11af PM |
93 | sth r9,0(r3) |
94 | addi r3,r3,2 | |
95 | 2: bf cr7*4+3,3f | |
e423b9ec | 96 | lbz r9,8(r4) |
14cf11af | 97 | stb r9,0(r3) |
752a6422 | 98 | 3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */ |
d0027bf0 | 99 | blr |
14cf11af PM |
100 | |
101 | .Lsrc_unaligned: | |
102 | srdi r6,r5,3 | |
103 | addi r5,r5,-16 | |
104 | subf r4,r0,r4 | |
105 | srdi r7,r5,4 | |
106 | sldi r10,r0,3 | |
107 | cmpdi cr6,r6,3 | |
108 | andi. r5,r5,7 | |
109 | mtctr r7 | |
110 | subfic r11,r10,64 | |
111 | add r5,r5,r0 | |
112 | ||
113 | bt cr7*4+0,0f | |
114 | ||
115 | ld r9,0(r4) # 3+2n loads, 2+2n stores | |
116 | ld r0,8(r4) | |
117 | sld r6,r9,r10 | |
118 | ldu r9,16(r4) | |
119 | srd r7,r0,r11 | |
120 | sld r8,r0,r10 | |
121 | or r7,r7,r6 | |
122 | blt cr6,4f | |
123 | ld r0,8(r4) | |
124 | # s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12 | |
125 | b 2f | |
126 | ||
127 | 0: ld r0,0(r4) # 4+2n loads, 3+2n stores | |
128 | ldu r9,8(r4) | |
129 | sld r8,r0,r10 | |
130 | addi r3,r3,-8 | |
131 | blt cr6,5f | |
132 | ld r0,8(r4) | |
133 | srd r12,r9,r11 | |
134 | sld r6,r9,r10 | |
135 | ldu r9,16(r4) | |
136 | or r12,r8,r12 | |
137 | srd r7,r0,r11 | |
138 | sld r8,r0,r10 | |
139 | addi r3,r3,16 | |
140 | beq cr6,3f | |
141 | ||
142 | # d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9 | |
143 | 1: or r7,r7,r6 | |
144 | ld r0,8(r4) | |
145 | std r12,8(r3) | |
146 | 2: srd r12,r9,r11 | |
147 | sld r6,r9,r10 | |
148 | ldu r9,16(r4) | |
149 | or r12,r8,r12 | |
150 | stdu r7,16(r3) | |
151 | srd r7,r0,r11 | |
152 | sld r8,r0,r10 | |
153 | bdnz 1b | |
154 | ||
155 | 3: std r12,8(r3) | |
156 | or r7,r7,r6 | |
157 | 4: std r7,16(r3) | |
158 | 5: srd r12,r9,r11 | |
159 | or r12,r8,r12 | |
160 | std r12,24(r3) | |
d0027bf0 | 161 | beq 4f |
14cf11af PM |
162 | cmpwi cr1,r5,8 |
163 | addi r3,r3,32 | |
164 | sld r9,r9,r10 | |
e423b9ec | 165 | ble cr1,6f |
14cf11af PM |
166 | ld r0,8(r4) |
167 | srd r7,r0,r11 | |
168 | or r9,r7,r9 | |
e423b9ec MN |
169 | 6: |
170 | bf cr7*4+1,1f | |
171 | rotldi r9,r9,32 | |
172 | stw r9,0(r3) | |
173 | addi r3,r3,4 | |
174 | 1: bf cr7*4+2,2f | |
175 | rotldi r9,r9,16 | |
176 | sth r9,0(r3) | |
177 | addi r3,r3,2 | |
178 | 2: bf cr7*4+3,3f | |
179 | rotldi r9,r9,8 | |
180 | stb r9,0(r3) | |
752a6422 | 181 | 3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */ |
e423b9ec | 182 | blr |
14cf11af PM |
183 | |
184 | .Ldst_unaligned: | |
86e32fdc | 185 | PPC_MTOCRF(0x01,r6) # put #bytes to 8B bdry into cr7 |
14cf11af PM |
186 | subf r5,r6,r5 |
187 | li r7,0 | |
25d6e2d7 | 188 | cmpldi cr1,r5,16 |
14cf11af PM |
189 | bf cr7*4+3,1f |
190 | lbz r0,0(r4) | |
191 | stb r0,0(r3) | |
192 | addi r7,r7,1 | |
193 | 1: bf cr7*4+2,2f | |
194 | lhzx r0,r7,r4 | |
195 | sthx r0,r7,r3 | |
196 | addi r7,r7,2 | |
197 | 2: bf cr7*4+1,3f | |
198 | lwzx r0,r7,r4 | |
199 | stwx r0,r7,r3 | |
86e32fdc | 200 | 3: PPC_MTOCRF(0x01,r5) |
14cf11af PM |
201 | add r4,r6,r4 |
202 | add r3,r6,r3 | |
203 | b .Ldst_aligned | |
204 | ||
205 | .Lshort_copy: | |
206 | bf cr7*4+0,1f | |
207 | lwz r0,0(r4) | |
208 | lwz r9,4(r4) | |
209 | addi r4,r4,8 | |
210 | stw r0,0(r3) | |
211 | stw r9,4(r3) | |
212 | addi r3,r3,8 | |
213 | 1: bf cr7*4+1,2f | |
214 | lwz r0,0(r4) | |
215 | addi r4,r4,4 | |
216 | stw r0,0(r3) | |
217 | addi r3,r3,4 | |
218 | 2: bf cr7*4+2,3f | |
219 | lhz r0,0(r4) | |
220 | addi r4,r4,2 | |
221 | sth r0,0(r3) | |
222 | addi r3,r3,2 | |
223 | 3: bf cr7*4+3,4f | |
224 | lbz r0,0(r4) | |
225 | stb r0,0(r3) | |
752a6422 | 226 | 4: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */ |
d0027bf0 | 227 | blr |
00f554fa | 228 | #endif |
9445aa1a | 229 | EXPORT_SYMBOL(memcpy) |
26deb043 | 230 | EXPORT_SYMBOL_KASAN(memcpy) |