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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 | /* SPDX-License-Identifier: GPL-2.0 */ // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/linkage.h> .macro GET_FRONT_BITS rx y #ifdef __cskyLE__ lsri \rx, \y #else lsli \rx, \y #endif .endm .macro GET_AFTER_BITS rx y #ifdef __cskyLE__ lsli \rx, \y #else lsri \rx, \y #endif .endm /* void *memcpy(void *dest, const void *src, size_t n); */ ENTRY(memcpy) mov r7, r2 cmplti r4, 4 bt .L_copy_by_byte mov r6, r2 andi r6, 3 cmpnei r6, 0 jbt .L_dest_not_aligned mov r6, r3 andi r6, 3 cmpnei r6, 0 jbt .L_dest_aligned_but_src_not_aligned .L0: cmplti r4, 16 jbt .L_aligned_and_len_less_16bytes subi sp, 8 stw r8, (sp, 0) .L_aligned_and_len_larger_16bytes: ldw r1, (r3, 0) ldw r5, (r3, 4) ldw r8, (r3, 8) stw r1, (r7, 0) ldw r1, (r3, 12) stw r5, (r7, 4) stw r8, (r7, 8) stw r1, (r7, 12) subi r4, 16 addi r3, 16 addi r7, 16 cmplti r4, 16 jbf .L_aligned_and_len_larger_16bytes ldw r8, (sp, 0) addi sp, 8 cmpnei r4, 0 jbf .L_return .L_aligned_and_len_less_16bytes: cmplti r4, 4 bt .L_copy_by_byte .L1: ldw r1, (r3, 0) stw r1, (r7, 0) subi r4, 4 addi r3, 4 addi r7, 4 cmplti r4, 4 jbf .L1 br .L_copy_by_byte .L_return: rts .L_copy_by_byte: /* len less than 4 bytes */ cmpnei r4, 0 jbf .L_return .L4: ldb r1, (r3, 0) stb r1, (r7, 0) addi r3, 1 addi r7, 1 decne r4 jbt .L4 rts /* * If dest is not aligned, just copying some bytes makes the dest align. * Afther that, we judge whether the src is aligned. */ .L_dest_not_aligned: mov r5, r3 rsub r5, r5, r7 abs r5, r5 cmplt r5, r4 bt .L_copy_by_byte mov r5, r7 sub r5, r3 cmphs r5, r4 bf .L_copy_by_byte mov r5, r6 .L5: ldb r1, (r3, 0) /* makes the dest align. */ stb r1, (r7, 0) addi r5, 1 subi r4, 1 addi r3, 1 addi r7, 1 cmpnei r5, 4 jbt .L5 cmplti r4, 4 jbt .L_copy_by_byte mov r6, r3 /* judge whether the src is aligned. */ andi r6, 3 cmpnei r6, 0 jbf .L0 /* Judge the number of misaligned, 1, 2, 3? */ .L_dest_aligned_but_src_not_aligned: mov r5, r3 rsub r5, r5, r7 abs r5, r5 cmplt r5, r4 bt .L_copy_by_byte bclri r3, 0 bclri r3, 1 ldw r1, (r3, 0) addi r3, 4 cmpnei r6, 2 bf .L_dest_aligned_but_src_not_aligned_2bytes cmpnei r6, 3 bf .L_dest_aligned_but_src_not_aligned_3bytes .L_dest_aligned_but_src_not_aligned_1byte: mov r5, r7 sub r5, r3 cmphs r5, r4 bf .L_copy_by_byte cmplti r4, 16 bf .L11 .L10: /* If the len is less than 16 bytes */ GET_FRONT_BITS r1 8 mov r5, r1 ldw r6, (r3, 0) mov r1, r6 GET_AFTER_BITS r6 24 or r5, r6 stw r5, (r7, 0) subi r4, 4 addi r3, 4 addi r7, 4 cmplti r4, 4 bf .L10 subi r3, 3 br .L_copy_by_byte .L11: subi sp, 16 stw r8, (sp, 0) stw r9, (sp, 4) stw r10, (sp, 8) stw r11, (sp, 12) .L12: ldw r5, (r3, 0) ldw r11, (r3, 4) ldw r8, (r3, 8) ldw r9, (r3, 12) GET_FRONT_BITS r1 8 /* little or big endian? */ mov r10, r5 GET_AFTER_BITS r5 24 or r5, r1 GET_FRONT_BITS r10 8 mov r1, r11 GET_AFTER_BITS r11 24 or r11, r10 GET_FRONT_BITS r1 8 mov r10, r8 GET_AFTER_BITS r8 24 or r8, r1 GET_FRONT_BITS r10 8 mov r1, r9 GET_AFTER_BITS r9 24 or r9, r10 stw r5, (r7, 0) stw r11, (r7, 4) stw r8, (r7, 8) stw r9, (r7, 12) subi r4, 16 addi r3, 16 addi r7, 16 cmplti r4, 16 jbf .L12 ldw r8, (sp, 0) ldw r9, (sp, 4) ldw r10, (sp, 8) ldw r11, (sp, 12) addi sp , 16 cmplti r4, 4 bf .L10 subi r3, 3 br .L_copy_by_byte .L_dest_aligned_but_src_not_aligned_2bytes: cmplti r4, 16 bf .L21 .L20: GET_FRONT_BITS r1 16 mov r5, r1 ldw r6, (r3, 0) mov r1, r6 GET_AFTER_BITS r6 16 or r5, r6 stw r5, (r7, 0) subi r4, 4 addi r3, 4 addi r7, 4 cmplti r4, 4 bf .L20 subi r3, 2 br .L_copy_by_byte rts .L21: /* n > 16 */ subi sp, 16 stw r8, (sp, 0) stw r9, (sp, 4) stw r10, (sp, 8) stw r11, (sp, 12) .L22: ldw r5, (r3, 0) ldw r11, (r3, 4) ldw r8, (r3, 8) ldw r9, (r3, 12) GET_FRONT_BITS r1 16 mov r10, r5 GET_AFTER_BITS r5 16 or r5, r1 GET_FRONT_BITS r10 16 mov r1, r11 GET_AFTER_BITS r11 16 or r11, r10 GET_FRONT_BITS r1 16 mov r10, r8 GET_AFTER_BITS r8 16 or r8, r1 GET_FRONT_BITS r10 16 mov r1, r9 GET_AFTER_BITS r9 16 or r9, r10 stw r5, (r7, 0) stw r11, (r7, 4) stw r8, (r7, 8) stw r9, (r7, 12) subi r4, 16 addi r3, 16 addi r7, 16 cmplti r4, 16 jbf .L22 ldw r8, (sp, 0) ldw r9, (sp, 4) ldw r10, (sp, 8) ldw r11, (sp, 12) addi sp, 16 cmplti r4, 4 bf .L20 subi r3, 2 br .L_copy_by_byte .L_dest_aligned_but_src_not_aligned_3bytes: cmplti r4, 16 bf .L31 .L30: GET_FRONT_BITS r1 24 mov r5, r1 ldw r6, (r3, 0) mov r1, r6 GET_AFTER_BITS r6 8 or r5, r6 stw r5, (r7, 0) subi r4, 4 addi r3, 4 addi r7, 4 cmplti r4, 4 bf .L30 subi r3, 1 br .L_copy_by_byte .L31: subi sp, 16 stw r8, (sp, 0) stw r9, (sp, 4) stw r10, (sp, 8) stw r11, (sp, 12) .L32: ldw r5, (r3, 0) ldw r11, (r3, 4) ldw r8, (r3, 8) ldw r9, (r3, 12) GET_FRONT_BITS r1 24 mov r10, r5 GET_AFTER_BITS r5 8 or r5, r1 GET_FRONT_BITS r10 24 mov r1, r11 GET_AFTER_BITS r11 8 or r11, r10 GET_FRONT_BITS r1 24 mov r10, r8 GET_AFTER_BITS r8 8 or r8, r1 GET_FRONT_BITS r10 24 mov r1, r9 GET_AFTER_BITS r9 8 or r9, r10 stw r5, (r7, 0) stw r11, (r7, 4) stw r8, (r7, 8) stw r9, (r7, 12) subi r4, 16 addi r3, 16 addi r7, 16 cmplti r4, 16 jbf .L32 ldw r8, (sp, 0) ldw r9, (sp, 4) ldw r10, (sp, 8) ldw r11, (sp, 12) addi sp, 16 cmplti r4, 4 bf .L30 subi r3, 1 br .L_copy_by_byte |