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
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