| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|
| 2 | /* |
|---|
| 3 | * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
|---|
| 4 | */ |
|---|
| 5 | |
|---|
| 6 | #include <linux/export.h> |
|---|
| 7 | #include <asm/alternative-asm.h> |
|---|
| 8 | #include <asm/asm.h> |
|---|
| 9 | #include <asm/asmmacro.h> |
|---|
| 10 | #include <asm/asm-extable.h> |
|---|
| 11 | #include <asm/cpu.h> |
|---|
| 12 | #include <asm/regdef.h> |
|---|
| 13 | #include <asm/unwind_hints.h> |
|---|
| 14 | |
|---|
| 15 | SYM_FUNC_START(__copy_user) |
|---|
| 16 | /* |
|---|
| 17 | * Some CPUs support hardware unaligned access |
|---|
| 18 | */ |
|---|
| 19 | ALTERNATIVE "b __copy_user_generic" , \ |
|---|
| 20 | "b __copy_user_fast" , CPU_FEATURE_UAL |
|---|
| 21 | SYM_FUNC_END(__copy_user) |
|---|
| 22 | |
|---|
| 23 | EXPORT_SYMBOL(__copy_user) |
|---|
| 24 | |
|---|
| 25 | /* |
|---|
| 26 | * unsigned long __copy_user_generic(void *to, const void *from, size_t n) |
|---|
| 27 | * |
|---|
| 28 | * a0: to |
|---|
| 29 | * a1: from |
|---|
| 30 | * a2: n |
|---|
| 31 | */ |
|---|
| 32 | SYM_FUNC_START(__copy_user_generic) |
|---|
| 33 | beqz a2, 3f |
|---|
| 34 | |
|---|
| 35 | 1: ld.b t0, a1, 0 |
|---|
| 36 | 2: st.b t0, a0, 0 |
|---|
| 37 | addi.d a0, a0, 1 |
|---|
| 38 | addi.d a1, a1, 1 |
|---|
| 39 | addi.d a2, a2, -1 |
|---|
| 40 | bgtz a2, 1b |
|---|
| 41 | |
|---|
| 42 | 3: move a0, a2 |
|---|
| 43 | jr ra |
|---|
| 44 | |
|---|
| 45 | _asm_extable 1b, 3b |
|---|
| 46 | _asm_extable 2b, 3b |
|---|
| 47 | SYM_FUNC_END(__copy_user_generic) |
|---|
| 48 | |
|---|
| 49 | /* |
|---|
| 50 | * unsigned long __copy_user_fast(void *to, const void *from, unsigned long n) |
|---|
| 51 | * |
|---|
| 52 | * a0: to |
|---|
| 53 | * a1: from |
|---|
| 54 | * a2: n |
|---|
| 55 | */ |
|---|
| 56 | SYM_FUNC_START(__copy_user_fast) |
|---|
| 57 | sltui t0, a2, 9 |
|---|
| 58 | bnez t0, .Lsmall |
|---|
| 59 | |
|---|
| 60 | 0: ld.d t0, a1, 0 |
|---|
| 61 | 1: st.d t0, a0, 0 |
|---|
| 62 | add.d a3, a1, a2 |
|---|
| 63 | add.d a2, a0, a2 |
|---|
| 64 | |
|---|
| 65 | /* align up destination address */ |
|---|
| 66 | andi t1, a0, 7 |
|---|
| 67 | sub.d t0, zero, t1 |
|---|
| 68 | addi.d t0, t0, 8 |
|---|
| 69 | add.d a1, a1, t0 |
|---|
| 70 | add.d a0, a0, t0 |
|---|
| 71 | |
|---|
| 72 | addi.d a4, a3, -64 |
|---|
| 73 | bgeu a1, a4, .Llt64 |
|---|
| 74 | |
|---|
| 75 | /* copy 64 bytes at a time */ |
|---|
| 76 | .Lloop64: |
|---|
| 77 | 2: ld.d t0, a1, 0 |
|---|
| 78 | 3: ld.d t1, a1, 8 |
|---|
| 79 | 4: ld.d t2, a1, 16 |
|---|
| 80 | 5: ld.d t3, a1, 24 |
|---|
| 81 | 6: ld.d t4, a1, 32 |
|---|
| 82 | 7: ld.d t5, a1, 40 |
|---|
| 83 | 8: ld.d t6, a1, 48 |
|---|
| 84 | 9: ld.d t7, a1, 56 |
|---|
| 85 | 10: st.d t0, a0, 0 |
|---|
| 86 | 11: st.d t1, a0, 8 |
|---|
| 87 | 12: st.d t2, a0, 16 |
|---|
| 88 | 13: st.d t3, a0, 24 |
|---|
| 89 | 14: st.d t4, a0, 32 |
|---|
| 90 | 15: st.d t5, a0, 40 |
|---|
| 91 | 16: st.d t6, a0, 48 |
|---|
| 92 | 17: st.d t7, a0, 56 |
|---|
| 93 | addi.d a1, a1, 64 |
|---|
| 94 | addi.d a0, a0, 64 |
|---|
| 95 | bltu a1, a4, .Lloop64 |
|---|
| 96 | |
|---|
| 97 | /* copy the remaining bytes */ |
|---|
| 98 | .Llt64: |
|---|
| 99 | addi.d a4, a3, -32 |
|---|
| 100 | bgeu a1, a4, .Llt32 |
|---|
| 101 | 18: ld.d t0, a1, 0 |
|---|
| 102 | 19: ld.d t1, a1, 8 |
|---|
| 103 | 20: ld.d t2, a1, 16 |
|---|
| 104 | 21: ld.d t3, a1, 24 |
|---|
| 105 | 22: st.d t0, a0, 0 |
|---|
| 106 | 23: st.d t1, a0, 8 |
|---|
| 107 | 24: st.d t2, a0, 16 |
|---|
| 108 | 25: st.d t3, a0, 24 |
|---|
| 109 | addi.d a1, a1, 32 |
|---|
| 110 | addi.d a0, a0, 32 |
|---|
| 111 | |
|---|
| 112 | .Llt32: |
|---|
| 113 | addi.d a4, a3, -16 |
|---|
| 114 | bgeu a1, a4, .Llt16 |
|---|
| 115 | 26: ld.d t0, a1, 0 |
|---|
| 116 | 27: ld.d t1, a1, 8 |
|---|
| 117 | 28: st.d t0, a0, 0 |
|---|
| 118 | 29: st.d t1, a0, 8 |
|---|
| 119 | addi.d a1, a1, 16 |
|---|
| 120 | addi.d a0, a0, 16 |
|---|
| 121 | |
|---|
| 122 | .Llt16: |
|---|
| 123 | addi.d a4, a3, -8 |
|---|
| 124 | bgeu a1, a4, .Llt8 |
|---|
| 125 | 30: ld.d t0, a1, 0 |
|---|
| 126 | 31: st.d t0, a0, 0 |
|---|
| 127 | addi.d a1, a1, 8 |
|---|
| 128 | addi.d a0, a0, 8 |
|---|
| 129 | |
|---|
| 130 | .Llt8: |
|---|
| 131 | 32: ld.d t0, a3, -8 |
|---|
| 132 | 33: st.d t0, a2, -8 |
|---|
| 133 | |
|---|
| 134 | /* return */ |
|---|
| 135 | move a0, zero |
|---|
| 136 | jr ra |
|---|
| 137 | |
|---|
| 138 | .align 5 |
|---|
| 139 | .Lsmall: |
|---|
| 140 | pcaddi t0, 8 |
|---|
| 141 | slli.d a3, a2, 5 |
|---|
| 142 | add.d t0, t0, a3 |
|---|
| 143 | jr t0 |
|---|
| 144 | |
|---|
| 145 | .align 5 |
|---|
| 146 | move a0, zero |
|---|
| 147 | jr ra |
|---|
| 148 | |
|---|
| 149 | .align 5 |
|---|
| 150 | 34: ld.b t0, a1, 0 |
|---|
| 151 | 35: st.b t0, a0, 0 |
|---|
| 152 | move a0, zero |
|---|
| 153 | jr ra |
|---|
| 154 | |
|---|
| 155 | .align 5 |
|---|
| 156 | 36: ld.h t0, a1, 0 |
|---|
| 157 | 37: st.h t0, a0, 0 |
|---|
| 158 | move a0, zero |
|---|
| 159 | jr ra |
|---|
| 160 | |
|---|
| 161 | .align 5 |
|---|
| 162 | 38: ld.h t0, a1, 0 |
|---|
| 163 | 39: ld.b t1, a1, 2 |
|---|
| 164 | 40: st.h t0, a0, 0 |
|---|
| 165 | 41: st.b t1, a0, 2 |
|---|
| 166 | move a0, zero |
|---|
| 167 | jr ra |
|---|
| 168 | |
|---|
| 169 | .align 5 |
|---|
| 170 | 42: ld.w t0, a1, 0 |
|---|
| 171 | 43: st.w t0, a0, 0 |
|---|
| 172 | move a0, zero |
|---|
| 173 | jr ra |
|---|
| 174 | |
|---|
| 175 | .align 5 |
|---|
| 176 | 44: ld.w t0, a1, 0 |
|---|
| 177 | 45: ld.b t1, a1, 4 |
|---|
| 178 | 46: st.w t0, a0, 0 |
|---|
| 179 | 47: st.b t1, a0, 4 |
|---|
| 180 | move a0, zero |
|---|
| 181 | jr ra |
|---|
| 182 | |
|---|
| 183 | .align 5 |
|---|
| 184 | 48: ld.w t0, a1, 0 |
|---|
| 185 | 49: ld.h t1, a1, 4 |
|---|
| 186 | 50: st.w t0, a0, 0 |
|---|
| 187 | 51: st.h t1, a0, 4 |
|---|
| 188 | move a0, zero |
|---|
| 189 | jr ra |
|---|
| 190 | |
|---|
| 191 | .align 5 |
|---|
| 192 | 52: ld.w t0, a1, 0 |
|---|
| 193 | 53: ld.w t1, a1, 3 |
|---|
| 194 | 54: st.w t0, a0, 0 |
|---|
| 195 | 55: st.w t1, a0, 3 |
|---|
| 196 | move a0, zero |
|---|
| 197 | jr ra |
|---|
| 198 | |
|---|
| 199 | .align 5 |
|---|
| 200 | 56: ld.d t0, a1, 0 |
|---|
| 201 | 57: st.d t0, a0, 0 |
|---|
| 202 | move a0, zero |
|---|
| 203 | jr ra |
|---|
| 204 | |
|---|
| 205 | /* fixup and ex_table */ |
|---|
| 206 | .Llarge_fixup: |
|---|
| 207 | sub.d a2, a2, a0 |
|---|
| 208 | |
|---|
| 209 | .Lsmall_fixup: |
|---|
| 210 | 58: ld.b t0, a1, 0 |
|---|
| 211 | 59: st.b t0, a0, 0 |
|---|
| 212 | addi.d a0, a0, 1 |
|---|
| 213 | addi.d a1, a1, 1 |
|---|
| 214 | addi.d a2, a2, -1 |
|---|
| 215 | bgt a2, zero, 58b |
|---|
| 216 | |
|---|
| 217 | .Lexit: |
|---|
| 218 | move a0, a2 |
|---|
| 219 | jr ra |
|---|
| 220 | |
|---|
| 221 | _asm_extable 0b, .Lsmall_fixup |
|---|
| 222 | _asm_extable 1b, .Lsmall_fixup |
|---|
| 223 | _asm_extable 2b, .Llarge_fixup |
|---|
| 224 | _asm_extable 3b, .Llarge_fixup |
|---|
| 225 | _asm_extable 4b, .Llarge_fixup |
|---|
| 226 | _asm_extable 5b, .Llarge_fixup |
|---|
| 227 | _asm_extable 6b, .Llarge_fixup |
|---|
| 228 | _asm_extable 7b, .Llarge_fixup |
|---|
| 229 | _asm_extable 8b, .Llarge_fixup |
|---|
| 230 | _asm_extable 9b, .Llarge_fixup |
|---|
| 231 | _asm_extable 10b, .Llarge_fixup |
|---|
| 232 | _asm_extable 11b, .Llarge_fixup |
|---|
| 233 | _asm_extable 12b, .Llarge_fixup |
|---|
| 234 | _asm_extable 13b, .Llarge_fixup |
|---|
| 235 | _asm_extable 14b, .Llarge_fixup |
|---|
| 236 | _asm_extable 15b, .Llarge_fixup |
|---|
| 237 | _asm_extable 16b, .Llarge_fixup |
|---|
| 238 | _asm_extable 17b, .Llarge_fixup |
|---|
| 239 | _asm_extable 18b, .Llarge_fixup |
|---|
| 240 | _asm_extable 19b, .Llarge_fixup |
|---|
| 241 | _asm_extable 20b, .Llarge_fixup |
|---|
| 242 | _asm_extable 21b, .Llarge_fixup |
|---|
| 243 | _asm_extable 22b, .Llarge_fixup |
|---|
| 244 | _asm_extable 23b, .Llarge_fixup |
|---|
| 245 | _asm_extable 24b, .Llarge_fixup |
|---|
| 246 | _asm_extable 25b, .Llarge_fixup |
|---|
| 247 | _asm_extable 26b, .Llarge_fixup |
|---|
| 248 | _asm_extable 27b, .Llarge_fixup |
|---|
| 249 | _asm_extable 28b, .Llarge_fixup |
|---|
| 250 | _asm_extable 29b, .Llarge_fixup |
|---|
| 251 | _asm_extable 30b, .Llarge_fixup |
|---|
| 252 | _asm_extable 31b, .Llarge_fixup |
|---|
| 253 | _asm_extable 32b, .Llarge_fixup |
|---|
| 254 | _asm_extable 33b, .Llarge_fixup |
|---|
| 255 | _asm_extable 34b, .Lexit |
|---|
| 256 | _asm_extable 35b, .Lexit |
|---|
| 257 | _asm_extable 36b, .Lsmall_fixup |
|---|
| 258 | _asm_extable 37b, .Lsmall_fixup |
|---|
| 259 | _asm_extable 38b, .Lsmall_fixup |
|---|
| 260 | _asm_extable 39b, .Lsmall_fixup |
|---|
| 261 | _asm_extable 40b, .Lsmall_fixup |
|---|
| 262 | _asm_extable 41b, .Lsmall_fixup |
|---|
| 263 | _asm_extable 42b, .Lsmall_fixup |
|---|
| 264 | _asm_extable 43b, .Lsmall_fixup |
|---|
| 265 | _asm_extable 44b, .Lsmall_fixup |
|---|
| 266 | _asm_extable 45b, .Lsmall_fixup |
|---|
| 267 | _asm_extable 46b, .Lsmall_fixup |
|---|
| 268 | _asm_extable 47b, .Lsmall_fixup |
|---|
| 269 | _asm_extable 48b, .Lsmall_fixup |
|---|
| 270 | _asm_extable 49b, .Lsmall_fixup |
|---|
| 271 | _asm_extable 50b, .Lsmall_fixup |
|---|
| 272 | _asm_extable 51b, .Lsmall_fixup |
|---|
| 273 | _asm_extable 52b, .Lsmall_fixup |
|---|
| 274 | _asm_extable 53b, .Lsmall_fixup |
|---|
| 275 | _asm_extable 54b, .Lsmall_fixup |
|---|
| 276 | _asm_extable 55b, .Lsmall_fixup |
|---|
| 277 | _asm_extable 56b, .Lsmall_fixup |
|---|
| 278 | _asm_extable 57b, .Lsmall_fixup |
|---|
| 279 | _asm_extable 58b, .Lexit |
|---|
| 280 | _asm_extable 59b, .Lexit |
|---|
| 281 | SYM_FUNC_END(__copy_user_fast) |
|---|
| 282 | |
|---|
| 283 | STACK_FRAME_NON_STANDARD __copy_user_fast |
|---|
| 284 | |
|---|
