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| 1 | /* Atomic operations used inside libc. Linux/SH version. |
|---|---|
| 2 | Copyright (C) 2003-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #define __HAVE_64B_ATOMICS 0 |
| 20 | #define USE_ATOMIC_COMPILER_BUILTINS 0 |
| 21 | |
| 22 | /* XXX Is this actually correct? */ |
| 23 | #define ATOMIC_EXCHANGE_USES_CAS 1 |
| 24 | |
| 25 | /* SH kernel has implemented a gUSA ("g" User Space Atomicity) support |
| 26 | for the user space atomicity. The atomicity macros use this scheme. |
| 27 | |
| 28 | Reference: |
| 29 | Niibe Yutaka, "gUSA: Simple and Efficient User Space Atomicity |
| 30 | Emulation with Little Kernel Modification", Linux Conference 2002, |
| 31 | Japan. http://lc.linux.or.jp/lc2002/papers/niibe0919h.pdf (in |
| 32 | Japanese). |
| 33 | |
| 34 | B.N. Bershad, D. Redell, and J. Ellis, "Fast Mutual Exclusion for |
| 35 | Uniprocessors", Proceedings of the Fifth Architectural Support for |
| 36 | Programming Languages and Operating Systems (ASPLOS), pp. 223-233, |
| 37 | October 1992. http://www.cs.washington.edu/homes/bershad/Papers/Rcs.ps |
| 38 | |
| 39 | SuperH ABI: |
| 40 | r15: -(size of atomic instruction sequence) < 0 |
| 41 | r0: end point |
| 42 | r1: saved stack pointer |
| 43 | */ |
| 44 | |
| 45 | #define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \ |
| 46 | ({ __typeof (*(mem)) __result; \ |
| 47 | __asm __volatile ("\ |
| 48 | mova 1f,r0\n\ |
| 49 | .align 2\n\ |
| 50 | mov r15,r1\n\ |
| 51 | mov #(0f-1f),r15\n\ |
| 52 | 0: mov.b @%1,%0\n\ |
| 53 | cmp/eq %0,%3\n\ |
| 54 | bf 1f\n\ |
| 55 | mov.b %2,@%1\n\ |
| 56 | 1: mov r1,r15"\ |
| 57 | : "=&r" (__result) : "u" (mem), "u" (newval), "u" (oldval) \ |
| 58 | : "r0", "r1", "t", "memory"); \ |
| 59 | __result; }) |
| 60 | |
| 61 | #define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \ |
| 62 | ({ __typeof (*(mem)) __result; \ |
| 63 | __asm __volatile ("\ |
| 64 | mova 1f,r0\n\ |
| 65 | mov r15,r1\n\ |
| 66 | .align 2\n\ |
| 67 | mov #(0f-1f),r15\n\ |
| 68 | mov #-8,r15\n\ |
| 69 | 0: mov.w @%1,%0\n\ |
| 70 | cmp/eq %0,%3\n\ |
| 71 | bf 1f\n\ |
| 72 | mov.w %2,@%1\n\ |
| 73 | 1: mov r1,r15"\ |
| 74 | : "=&r" (__result) : "u" (mem), "u" (newval), "u" (oldval) \ |
| 75 | : "r0", "r1", "t", "memory"); \ |
| 76 | __result; }) |
| 77 | |
| 78 | #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ |
| 79 | ({ __typeof (*(mem)) __result; \ |
| 80 | __asm __volatile ("\ |
| 81 | mova 1f,r0\n\ |
| 82 | .align 2\n\ |
| 83 | mov r15,r1\n\ |
| 84 | mov #(0f-1f),r15\n\ |
| 85 | 0: mov.l @%1,%0\n\ |
| 86 | cmp/eq %0,%3\n\ |
| 87 | bf 1f\n\ |
| 88 | mov.l %2,@%1\n\ |
| 89 | 1: mov r1,r15"\ |
| 90 | : "=&r" (__result) : "u" (mem), "u" (newval), "u" (oldval) \ |
| 91 | : "r0", "r1", "t", "memory"); \ |
| 92 | __result; }) |
| 93 | |
| 94 | /* XXX We do not really need 64-bit compare-and-exchange. At least |
| 95 | not in the moment. Using it would mean causing portability |
| 96 | problems since not many other 32-bit architectures have support for |
| 97 | such an operation. So don't define any code for now. */ |
| 98 | |
| 99 | # define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ |
| 100 | (abort (), (__typeof (*mem)) 0) |
| 101 | |
| 102 | #define atomic_exchange_and_add(mem, value) \ |
| 103 | ({ __typeof (*(mem)) __result, __tmp, __value = (value); \ |
| 104 | if (sizeof (*(mem)) == 1) \ |
| 105 | __asm __volatile ("\ |
| 106 | mova 1f,r0\n\ |
| 107 | .align 2\n\ |
| 108 | mov r15,r1\n\ |
| 109 | mov #(0f-1f),r15\n\ |
| 110 | 0: mov.b @%2,%0\n\ |
| 111 | mov %1,r2\n\ |
| 112 | add %0,r2\n\ |
| 113 | mov.b r2,@%2\n\ |
| 114 | 1: mov r1,r15"\ |
| 115 | : "=&r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 116 | : "r0", "r1", "r2", "memory"); \ |
| 117 | else if (sizeof (*(mem)) == 2) \ |
| 118 | __asm __volatile ("\ |
| 119 | mova 1f,r0\n\ |
| 120 | .align 2\n\ |
| 121 | mov r15,r1\n\ |
| 122 | mov #(0f-1f),r15\n\ |
| 123 | 0: mov.w @%2,%0\n\ |
| 124 | mov %1,r2\n\ |
| 125 | add %0,r2\n\ |
| 126 | mov.w r2,@%2\n\ |
| 127 | 1: mov r1,r15"\ |
| 128 | : "=&r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 129 | : "r0", "r1", "r2", "memory"); \ |
| 130 | else if (sizeof (*(mem)) == 4) \ |
| 131 | __asm __volatile ("\ |
| 132 | mova 1f,r0\n\ |
| 133 | .align 2\n\ |
| 134 | mov r15,r1\n\ |
| 135 | mov #(0f-1f),r15\n\ |
| 136 | 0: mov.l @%2,%0\n\ |
| 137 | mov %1,r2\n\ |
| 138 | add %0,r2\n\ |
| 139 | mov.l r2,@%2\n\ |
| 140 | 1: mov r1,r15"\ |
| 141 | : "=&r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 142 | : "r0", "r1", "r2", "memory"); \ |
| 143 | else \ |
| 144 | { \ |
| 145 | __typeof (mem) memp = (mem); \ |
| 146 | do \ |
| 147 | __result = *memp; \ |
| 148 | while (__arch_compare_and_exchange_val_64_acq \ |
| 149 | (memp, __result + __value, __result) == __result); \ |
| 150 | (void) __value; \ |
| 151 | } \ |
| 152 | __result; }) |
| 153 | |
| 154 | #define atomic_add(mem, value) \ |
| 155 | (void) ({ __typeof (*(mem)) __tmp, __value = (value); \ |
| 156 | if (sizeof (*(mem)) == 1) \ |
| 157 | __asm __volatile ("\ |
| 158 | mova 1f,r0\n\ |
| 159 | mov r15,r1\n\ |
| 160 | .align 2\n\ |
| 161 | mov #(0f-1f),r15\n\ |
| 162 | 0: mov.b @%1,r2\n\ |
| 163 | add %0,r2\n\ |
| 164 | mov.b r2,@%1\n\ |
| 165 | 1: mov r1,r15"\ |
| 166 | : "=&r" (__tmp) : "u" (mem), "0" (__value) \ |
| 167 | : "r0", "r1", "r2", "memory"); \ |
| 168 | else if (sizeof (*(mem)) == 2) \ |
| 169 | __asm __volatile ("\ |
| 170 | mova 1f,r0\n\ |
| 171 | mov r15,r1\n\ |
| 172 | .align 2\n\ |
| 173 | mov #(0f-1f),r15\n\ |
| 174 | 0: mov.w @%1,r2\n\ |
| 175 | add %0,r2\n\ |
| 176 | mov.w r2,@%1\n\ |
| 177 | 1: mov r1,r15"\ |
| 178 | : "=&r" (__tmp) : "u" (mem), "0" (__value) \ |
| 179 | : "r0", "r1", "r2", "memory"); \ |
| 180 | else if (sizeof (*(mem)) == 4) \ |
| 181 | __asm __volatile ("\ |
| 182 | mova 1f,r0\n\ |
| 183 | mov r15,r1\n\ |
| 184 | .align 2\n\ |
| 185 | mov #(0f-1f),r15\n\ |
| 186 | 0: mov.l @%1,r2\n\ |
| 187 | add %0,r2\n\ |
| 188 | mov.l r2,@%1\n\ |
| 189 | 1: mov r1,r15"\ |
| 190 | : "=&r" (__tmp) : "u" (mem), "0" (__value) \ |
| 191 | : "r0", "r1", "r2", "memory"); \ |
| 192 | else \ |
| 193 | { \ |
| 194 | __typeof (*(mem)) oldval; \ |
| 195 | __typeof (mem) memp = (mem); \ |
| 196 | do \ |
| 197 | oldval = *memp; \ |
| 198 | while (__arch_compare_and_exchange_val_64_acq \ |
| 199 | (memp, oldval + __value, oldval) == oldval); \ |
| 200 | (void) __value; \ |
| 201 | } \ |
| 202 | }) |
| 203 | |
| 204 | #define atomic_add_negative(mem, value) \ |
| 205 | ({ unsigned char __result; \ |
| 206 | __typeof (*(mem)) __tmp, __value = (value); \ |
| 207 | if (sizeof (*(mem)) == 1) \ |
| 208 | __asm __volatile ("\ |
| 209 | mova 1f,r0\n\ |
| 210 | mov r15,r1\n\ |
| 211 | .align 2\n\ |
| 212 | mov #(0f-1f),r15\n\ |
| 213 | 0: mov.b @%2,r2\n\ |
| 214 | add %1,r2\n\ |
| 215 | mov.b r2,@%2\n\ |
| 216 | 1: mov r1,r15\n\ |
| 217 | shal r2\n\ |
| 218 | movt %0"\ |
| 219 | : "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 220 | : "r0", "r1", "r2", "t", "memory"); \ |
| 221 | else if (sizeof (*(mem)) == 2) \ |
| 222 | __asm __volatile ("\ |
| 223 | mova 1f,r0\n\ |
| 224 | mov r15,r1\n\ |
| 225 | .align 2\n\ |
| 226 | mov #(0f-1f),r15\n\ |
| 227 | 0: mov.w @%2,r2\n\ |
| 228 | add %1,r2\n\ |
| 229 | mov.w r2,@%2\n\ |
| 230 | 1: mov r1,r15\n\ |
| 231 | shal r2\n\ |
| 232 | movt %0"\ |
| 233 | : "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 234 | : "r0", "r1", "r2", "t", "memory"); \ |
| 235 | else if (sizeof (*(mem)) == 4) \ |
| 236 | __asm __volatile ("\ |
| 237 | mova 1f,r0\n\ |
| 238 | mov r15,r1\n\ |
| 239 | .align 2\n\ |
| 240 | mov #(0f-1f),r15\n\ |
| 241 | 0: mov.l @%2,r2\n\ |
| 242 | add %1,r2\n\ |
| 243 | mov.l r2,@%2\n\ |
| 244 | 1: mov r1,r15\n\ |
| 245 | shal r2\n\ |
| 246 | movt %0"\ |
| 247 | : "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 248 | : "r0", "r1", "r2", "t", "memory"); \ |
| 249 | else \ |
| 250 | abort (); \ |
| 251 | __result; }) |
| 252 | |
| 253 | #define atomic_add_zero(mem, value) \ |
| 254 | ({ unsigned char __result; \ |
| 255 | __typeof (*(mem)) __tmp, __value = (value); \ |
| 256 | if (sizeof (*(mem)) == 1) \ |
| 257 | __asm __volatile ("\ |
| 258 | mova 1f,r0\n\ |
| 259 | mov r15,r1\n\ |
| 260 | .align 2\n\ |
| 261 | mov #(0f-1f),r15\n\ |
| 262 | 0: mov.b @%2,r2\n\ |
| 263 | add %1,r2\n\ |
| 264 | mov.b r2,@%2\n\ |
| 265 | 1: mov r1,r15\n\ |
| 266 | tst r2,r2\n\ |
| 267 | movt %0"\ |
| 268 | : "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 269 | : "r0", "r1", "r2", "t", "memory"); \ |
| 270 | else if (sizeof (*(mem)) == 2) \ |
| 271 | __asm __volatile ("\ |
| 272 | mova 1f,r0\n\ |
| 273 | mov r15,r1\n\ |
| 274 | .align 2\n\ |
| 275 | mov #(0f-1f),r15\n\ |
| 276 | 0: mov.w @%2,r2\n\ |
| 277 | add %1,r2\n\ |
| 278 | mov.w r2,@%2\n\ |
| 279 | 1: mov r1,r15\n\ |
| 280 | tst r2,r2\n\ |
| 281 | movt %0"\ |
| 282 | : "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 283 | : "r0", "r1", "r2", "t", "memory"); \ |
| 284 | else if (sizeof (*(mem)) == 4) \ |
| 285 | __asm __volatile ("\ |
| 286 | mova 1f,r0\n\ |
| 287 | mov r15,r1\n\ |
| 288 | .align 2\n\ |
| 289 | mov #(0f-1f),r15\n\ |
| 290 | 0: mov.l @%2,r2\n\ |
| 291 | add %1,r2\n\ |
| 292 | mov.l r2,@%2\n\ |
| 293 | 1: mov r1,r15\n\ |
| 294 | tst r2,r2\n\ |
| 295 | movt %0"\ |
| 296 | : "=r" (__result), "=&r" (__tmp) : "u" (mem), "1" (__value) \ |
| 297 | : "r0", "r1", "r2", "t", "memory"); \ |
| 298 | else \ |
| 299 | abort (); \ |
| 300 | __result; }) |
| 301 | |
| 302 | #define atomic_increment_and_test(mem) atomic_add_zero((mem), 1) |
| 303 | #define atomic_decrement_and_test(mem) atomic_add_zero((mem), -1) |
| 304 | |
| 305 | #define atomic_bit_set(mem, bit) \ |
| 306 | (void) ({ unsigned int __mask = 1 << (bit); \ |
| 307 | if (sizeof (*(mem)) == 1) \ |
| 308 | __asm __volatile ("\ |
| 309 | mova 1f,r0\n\ |
| 310 | mov r15,r1\n\ |
| 311 | .align 2\n\ |
| 312 | mov #(0f-1f),r15\n\ |
| 313 | 0: mov.b @%0,r2\n\ |
| 314 | or %1,r2\n\ |
| 315 | mov.b r2,@%0\n\ |
| 316 | 1: mov r1,r15"\ |
| 317 | : : "u" (mem), "u" (__mask) \ |
| 318 | : "r0", "r1", "r2", "memory"); \ |
| 319 | else if (sizeof (*(mem)) == 2) \ |
| 320 | __asm __volatile ("\ |
| 321 | mova 1f,r0\n\ |
| 322 | mov r15,r1\n\ |
| 323 | .align 2\n\ |
| 324 | mov #(0f-1f),r15\n\ |
| 325 | 0: mov.w @%0,r2\n\ |
| 326 | or %1,r2\n\ |
| 327 | mov.w r2,@%0\n\ |
| 328 | 1: mov r1,r15"\ |
| 329 | : : "u" (mem), "u" (__mask) \ |
| 330 | : "r0", "r1", "r2", "memory"); \ |
| 331 | else if (sizeof (*(mem)) == 4) \ |
| 332 | __asm __volatile ("\ |
| 333 | mova 1f,r0\n\ |
| 334 | mov r15,r1\n\ |
| 335 | .align 2\n\ |
| 336 | mov #(0f-1f),r15\n\ |
| 337 | 0: mov.l @%0,r2\n\ |
| 338 | or %1,r2\n\ |
| 339 | mov.l r2,@%0\n\ |
| 340 | 1: mov r1,r15"\ |
| 341 | : : "u" (mem), "u" (__mask) \ |
| 342 | : "r0", "r1", "r2", "memory"); \ |
| 343 | else \ |
| 344 | abort (); \ |
| 345 | }) |
| 346 | |
| 347 | #define atomic_bit_test_set(mem, bit) \ |
| 348 | ({ unsigned int __mask = 1 << (bit); \ |
| 349 | unsigned int __result = __mask; \ |
| 350 | if (sizeof (*(mem)) == 1) \ |
| 351 | __asm __volatile ("\ |
| 352 | mova 1f,r0\n\ |
| 353 | .align 2\n\ |
| 354 | mov r15,r1\n\ |
| 355 | mov #(0f-1f),r15\n\ |
| 356 | 0: mov.b @%2,r2\n\ |
| 357 | mov r2,r3\n\ |
| 358 | or %1,r2\n\ |
| 359 | mov.b r2,@%2\n\ |
| 360 | 1: mov r1,r15\n\ |
| 361 | and r3,%0"\ |
| 362 | : "=&r" (__result), "=&r" (__mask) \ |
| 363 | : "u" (mem), "0" (__result), "1" (__mask) \ |
| 364 | : "r0", "r1", "r2", "r3", "memory"); \ |
| 365 | else if (sizeof (*(mem)) == 2) \ |
| 366 | __asm __volatile ("\ |
| 367 | mova 1f,r0\n\ |
| 368 | .align 2\n\ |
| 369 | mov r15,r1\n\ |
| 370 | mov #(0f-1f),r15\n\ |
| 371 | 0: mov.w @%2,r2\n\ |
| 372 | mov r2,r3\n\ |
| 373 | or %1,r2\n\ |
| 374 | mov.w %1,@%2\n\ |
| 375 | 1: mov r1,r15\n\ |
| 376 | and r3,%0"\ |
| 377 | : "=&r" (__result), "=&r" (__mask) \ |
| 378 | : "u" (mem), "0" (__result), "1" (__mask) \ |
| 379 | : "r0", "r1", "r2", "r3", "memory"); \ |
| 380 | else if (sizeof (*(mem)) == 4) \ |
| 381 | __asm __volatile ("\ |
| 382 | mova 1f,r0\n\ |
| 383 | .align 2\n\ |
| 384 | mov r15,r1\n\ |
| 385 | mov #(0f-1f),r15\n\ |
| 386 | 0: mov.l @%2,r2\n\ |
| 387 | mov r2,r3\n\ |
| 388 | or r2,%1\n\ |
| 389 | mov.l %1,@%2\n\ |
| 390 | 1: mov r1,r15\n\ |
| 391 | and r3,%0"\ |
| 392 | : "=&r" (__result), "=&r" (__mask) \ |
| 393 | : "u" (mem), "0" (__result), "1" (__mask) \ |
| 394 | : "r0", "r1", "r2", "r3", "memory"); \ |
| 395 | else \ |
| 396 | abort (); \ |
| 397 | __result; }) |
| 398 |
Warning: This file is not a C or C++ file. It does not have highlighting.