| Guo Ren | c5af58b | 2018-09-05 14:25:18 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| 3 | |
| 4 | #include <linux/linkage.h> |
| 5 | |
| 6 | .macro GET_FRONT_BITS rx y |
| 7 | #ifdef __cskyLE__ |
| 8 | lsri \rx, \y |
| 9 | #else |
| 10 | lsli \rx, \y |
| 11 | #endif |
| 12 | .endm |
| 13 | |
| 14 | .macro GET_AFTER_BITS rx y |
| 15 | #ifdef __cskyLE__ |
| 16 | lsli \rx, \y |
| 17 | #else |
| 18 | lsri \rx, \y |
| 19 | #endif |
| 20 | .endm |
| 21 | |
| 22 | /* void *memcpy(void *dest, const void *src, size_t n); */ |
| 23 | ENTRY(memcpy) |
| 24 | mov r7, r2 |
| 25 | cmplti r4, 4 |
| 26 | bt .L_copy_by_byte |
| 27 | mov r6, r2 |
| 28 | andi r6, 3 |
| 29 | cmpnei r6, 0 |
| 30 | jbt .L_dest_not_aligned |
| 31 | mov r6, r3 |
| 32 | andi r6, 3 |
| 33 | cmpnei r6, 0 |
| 34 | jbt .L_dest_aligned_but_src_not_aligned |
| 35 | .L0: |
| 36 | cmplti r4, 16 |
| 37 | jbt .L_aligned_and_len_less_16bytes |
| 38 | subi sp, 8 |
| 39 | stw r8, (sp, 0) |
| 40 | .L_aligned_and_len_larger_16bytes: |
| 41 | ldw r1, (r3, 0) |
| 42 | ldw r5, (r3, 4) |
| 43 | ldw r8, (r3, 8) |
| 44 | stw r1, (r7, 0) |
| 45 | ldw r1, (r3, 12) |
| 46 | stw r5, (r7, 4) |
| 47 | stw r8, (r7, 8) |
| 48 | stw r1, (r7, 12) |
| 49 | subi r4, 16 |
| 50 | addi r3, 16 |
| 51 | addi r7, 16 |
| 52 | cmplti r4, 16 |
| 53 | jbf .L_aligned_and_len_larger_16bytes |
| 54 | ldw r8, (sp, 0) |
| 55 | addi sp, 8 |
| 56 | cmpnei r4, 0 |
| 57 | jbf .L_return |
| 58 | |
| 59 | .L_aligned_and_len_less_16bytes: |
| 60 | cmplti r4, 4 |
| 61 | bt .L_copy_by_byte |
| 62 | .L1: |
| 63 | ldw r1, (r3, 0) |
| 64 | stw r1, (r7, 0) |
| 65 | subi r4, 4 |
| 66 | addi r3, 4 |
| 67 | addi r7, 4 |
| 68 | cmplti r4, 4 |
| 69 | jbf .L1 |
| 70 | br .L_copy_by_byte |
| 71 | |
| 72 | .L_return: |
| 73 | rts |
| 74 | |
| 75 | .L_copy_by_byte: /* len less than 4 bytes */ |
| 76 | cmpnei r4, 0 |
| 77 | jbf .L_return |
| 78 | .L4: |
| 79 | ldb r1, (r3, 0) |
| 80 | stb r1, (r7, 0) |
| 81 | addi r3, 1 |
| 82 | addi r7, 1 |
| 83 | decne r4 |
| 84 | jbt .L4 |
| 85 | rts |
| 86 | |
| 87 | /* |
| 88 | * If dest is not aligned, just copying some bytes makes the dest align. |
| 89 | * Afther that, we judge whether the src is aligned. |
| 90 | */ |
| 91 | .L_dest_not_aligned: |
| 92 | mov r5, r3 |
| 93 | rsub r5, r5, r7 |
| 94 | abs r5, r5 |
| 95 | cmplt r5, r4 |
| 96 | bt .L_copy_by_byte |
| 97 | mov r5, r7 |
| 98 | sub r5, r3 |
| 99 | cmphs r5, r4 |
| 100 | bf .L_copy_by_byte |
| 101 | mov r5, r6 |
| 102 | .L5: |
| 103 | ldb r1, (r3, 0) /* makes the dest align. */ |
| 104 | stb r1, (r7, 0) |
| 105 | addi r5, 1 |
| 106 | subi r4, 1 |
| 107 | addi r3, 1 |
| 108 | addi r7, 1 |
| 109 | cmpnei r5, 4 |
| 110 | jbt .L5 |
| 111 | cmplti r4, 4 |
| 112 | jbt .L_copy_by_byte |
| 113 | mov r6, r3 /* judge whether the src is aligned. */ |
| 114 | andi r6, 3 |
| 115 | cmpnei r6, 0 |
| 116 | jbf .L0 |
| 117 | |
| 118 | /* Judge the number of misaligned, 1, 2, 3? */ |
| 119 | .L_dest_aligned_but_src_not_aligned: |
| 120 | mov r5, r3 |
| 121 | rsub r5, r5, r7 |
| 122 | abs r5, r5 |
| 123 | cmplt r5, r4 |
| 124 | bt .L_copy_by_byte |
| 125 | bclri r3, 0 |
| 126 | bclri r3, 1 |
| 127 | ldw r1, (r3, 0) |
| 128 | addi r3, 4 |
| 129 | cmpnei r6, 2 |
| 130 | bf .L_dest_aligned_but_src_not_aligned_2bytes |
| 131 | cmpnei r6, 3 |
| 132 | bf .L_dest_aligned_but_src_not_aligned_3bytes |
| 133 | |
| 134 | .L_dest_aligned_but_src_not_aligned_1byte: |
| 135 | mov r5, r7 |
| 136 | sub r5, r3 |
| 137 | cmphs r5, r4 |
| 138 | bf .L_copy_by_byte |
| 139 | cmplti r4, 16 |
| 140 | bf .L11 |
| 141 | .L10: /* If the len is less than 16 bytes */ |
| 142 | GET_FRONT_BITS r1 8 |
| 143 | mov r5, r1 |
| 144 | ldw r6, (r3, 0) |
| 145 | mov r1, r6 |
| 146 | GET_AFTER_BITS r6 24 |
| 147 | or r5, r6 |
| 148 | stw r5, (r7, 0) |
| 149 | subi r4, 4 |
| 150 | addi r3, 4 |
| 151 | addi r7, 4 |
| 152 | cmplti r4, 4 |
| 153 | bf .L10 |
| 154 | subi r3, 3 |
| 155 | br .L_copy_by_byte |
| 156 | .L11: |
| 157 | subi sp, 16 |
| 158 | stw r8, (sp, 0) |
| 159 | stw r9, (sp, 4) |
| 160 | stw r10, (sp, 8) |
| 161 | stw r11, (sp, 12) |
| 162 | .L12: |
| 163 | ldw r5, (r3, 0) |
| 164 | ldw r11, (r3, 4) |
| 165 | ldw r8, (r3, 8) |
| 166 | ldw r9, (r3, 12) |
| 167 | |
| 168 | GET_FRONT_BITS r1 8 /* little or big endian? */ |
| 169 | mov r10, r5 |
| 170 | GET_AFTER_BITS r5 24 |
| 171 | or r5, r1 |
| 172 | |
| 173 | GET_FRONT_BITS r10 8 |
| 174 | mov r1, r11 |
| 175 | GET_AFTER_BITS r11 24 |
| 176 | or r11, r10 |
| 177 | |
| 178 | GET_FRONT_BITS r1 8 |
| 179 | mov r10, r8 |
| 180 | GET_AFTER_BITS r8 24 |
| 181 | or r8, r1 |
| 182 | |
| 183 | GET_FRONT_BITS r10 8 |
| 184 | mov r1, r9 |
| 185 | GET_AFTER_BITS r9 24 |
| 186 | or r9, r10 |
| 187 | |
| 188 | stw r5, (r7, 0) |
| 189 | stw r11, (r7, 4) |
| 190 | stw r8, (r7, 8) |
| 191 | stw r9, (r7, 12) |
| 192 | subi r4, 16 |
| 193 | addi r3, 16 |
| 194 | addi r7, 16 |
| 195 | cmplti r4, 16 |
| 196 | jbf .L12 |
| 197 | ldw r8, (sp, 0) |
| 198 | ldw r9, (sp, 4) |
| 199 | ldw r10, (sp, 8) |
| 200 | ldw r11, (sp, 12) |
| 201 | addi sp , 16 |
| 202 | cmplti r4, 4 |
| 203 | bf .L10 |
| 204 | subi r3, 3 |
| 205 | br .L_copy_by_byte |
| 206 | |
| 207 | .L_dest_aligned_but_src_not_aligned_2bytes: |
| 208 | cmplti r4, 16 |
| 209 | bf .L21 |
| 210 | .L20: |
| 211 | GET_FRONT_BITS r1 16 |
| 212 | mov r5, r1 |
| 213 | ldw r6, (r3, 0) |
| 214 | mov r1, r6 |
| 215 | GET_AFTER_BITS r6 16 |
| 216 | or r5, r6 |
| 217 | stw r5, (r7, 0) |
| 218 | subi r4, 4 |
| 219 | addi r3, 4 |
| 220 | addi r7, 4 |
| 221 | cmplti r4, 4 |
| 222 | bf .L20 |
| 223 | subi r3, 2 |
| 224 | br .L_copy_by_byte |
| 225 | rts |
| 226 | |
| 227 | .L21: /* n > 16 */ |
| 228 | subi sp, 16 |
| 229 | stw r8, (sp, 0) |
| 230 | stw r9, (sp, 4) |
| 231 | stw r10, (sp, 8) |
| 232 | stw r11, (sp, 12) |
| 233 | |
| 234 | .L22: |
| 235 | ldw r5, (r3, 0) |
| 236 | ldw r11, (r3, 4) |
| 237 | ldw r8, (r3, 8) |
| 238 | ldw r9, (r3, 12) |
| 239 | |
| 240 | GET_FRONT_BITS r1 16 |
| 241 | mov r10, r5 |
| 242 | GET_AFTER_BITS r5 16 |
| 243 | or r5, r1 |
| 244 | |
| 245 | GET_FRONT_BITS r10 16 |
| 246 | mov r1, r11 |
| 247 | GET_AFTER_BITS r11 16 |
| 248 | or r11, r10 |
| 249 | |
| 250 | GET_FRONT_BITS r1 16 |
| 251 | mov r10, r8 |
| 252 | GET_AFTER_BITS r8 16 |
| 253 | or r8, r1 |
| 254 | |
| 255 | GET_FRONT_BITS r10 16 |
| 256 | mov r1, r9 |
| 257 | GET_AFTER_BITS r9 16 |
| 258 | or r9, r10 |
| 259 | |
| 260 | stw r5, (r7, 0) |
| 261 | stw r11, (r7, 4) |
| 262 | stw r8, (r7, 8) |
| 263 | stw r9, (r7, 12) |
| 264 | subi r4, 16 |
| 265 | addi r3, 16 |
| 266 | addi r7, 16 |
| 267 | cmplti r4, 16 |
| 268 | jbf .L22 |
| 269 | ldw r8, (sp, 0) |
| 270 | ldw r9, (sp, 4) |
| 271 | ldw r10, (sp, 8) |
| 272 | ldw r11, (sp, 12) |
| 273 | addi sp, 16 |
| 274 | cmplti r4, 4 |
| 275 | bf .L20 |
| 276 | subi r3, 2 |
| 277 | br .L_copy_by_byte |
| 278 | |
| 279 | |
| 280 | .L_dest_aligned_but_src_not_aligned_3bytes: |
| 281 | cmplti r4, 16 |
| 282 | bf .L31 |
| 283 | .L30: |
| 284 | GET_FRONT_BITS r1 24 |
| 285 | mov r5, r1 |
| 286 | ldw r6, (r3, 0) |
| 287 | mov r1, r6 |
| 288 | GET_AFTER_BITS r6 8 |
| 289 | or r5, r6 |
| 290 | stw r5, (r7, 0) |
| 291 | subi r4, 4 |
| 292 | addi r3, 4 |
| 293 | addi r7, 4 |
| 294 | cmplti r4, 4 |
| 295 | bf .L30 |
| 296 | subi r3, 1 |
| 297 | br .L_copy_by_byte |
| 298 | .L31: |
| 299 | subi sp, 16 |
| 300 | stw r8, (sp, 0) |
| 301 | stw r9, (sp, 4) |
| 302 | stw r10, (sp, 8) |
| 303 | stw r11, (sp, 12) |
| 304 | .L32: |
| 305 | ldw r5, (r3, 0) |
| 306 | ldw r11, (r3, 4) |
| 307 | ldw r8, (r3, 8) |
| 308 | ldw r9, (r3, 12) |
| 309 | |
| 310 | GET_FRONT_BITS r1 24 |
| 311 | mov r10, r5 |
| 312 | GET_AFTER_BITS r5 8 |
| 313 | or r5, r1 |
| 314 | |
| 315 | GET_FRONT_BITS r10 24 |
| 316 | mov r1, r11 |
| 317 | GET_AFTER_BITS r11 8 |
| 318 | or r11, r10 |
| 319 | |
| 320 | GET_FRONT_BITS r1 24 |
| 321 | mov r10, r8 |
| 322 | GET_AFTER_BITS r8 8 |
| 323 | or r8, r1 |
| 324 | |
| 325 | GET_FRONT_BITS r10 24 |
| 326 | mov r1, r9 |
| 327 | GET_AFTER_BITS r9 8 |
| 328 | or r9, r10 |
| 329 | |
| 330 | stw r5, (r7, 0) |
| 331 | stw r11, (r7, 4) |
| 332 | stw r8, (r7, 8) |
| 333 | stw r9, (r7, 12) |
| 334 | subi r4, 16 |
| 335 | addi r3, 16 |
| 336 | addi r7, 16 |
| 337 | cmplti r4, 16 |
| 338 | jbf .L32 |
| 339 | ldw r8, (sp, 0) |
| 340 | ldw r9, (sp, 4) |
| 341 | ldw r10, (sp, 8) |
| 342 | ldw r11, (sp, 12) |
| 343 | addi sp, 16 |
| 344 | cmplti r4, 4 |
| 345 | bf .L30 |
| 346 | subi r3, 1 |
| 347 | br .L_copy_by_byte |