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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 | /* SPDX-License-Identifier: GPL-2.0 */ // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #ifndef __ASM_CSKY_UACCESS_H #define __ASM_CSKY_UACCESS_H /* * User space memory access functions */ #include <linux/compiler.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/version.h> #include <asm/segment.h> static inline int access_ok(const void *addr, unsigned long size) { unsigned long limit = current_thread_info()->addr_limit.seg; return (((unsigned long)addr < limit) && ((unsigned long)(addr + size) < limit)); } #define __addr_ok(addr) (access_ok(addr, 0)) extern int __put_user_bad(void); /* * Tell gcc we read from memory instead of writing: this is because * we do not write to any memory gcc knows about, so there are no * aliasing issues. */ /* * These are the main single-value transfer routines. They automatically * use the right size if we just have the right pointer type. * * This gets kind of ugly. We want to return _two_ values in "get_user()" * and yet we don't want to do any pointers, because that is too much * of a performance impact. Thus we have a few rather ugly macros here, * and hide all the ugliness from the user. * * The "__xxx" versions of the user access functions are versions that * do not verify the address space, that must have been done previously * with a separate "access_ok()" call (this is used when we do multiple * accesses to the same area of user memory). * * As we use the same address space for kernel and user data on * Ckcore, we can just do these as direct assignments. (Of course, the * exception handling means that it's no longer "just"...) */ #define put_user(x, ptr) \ __put_user_check((x), (ptr), sizeof(*(ptr))) #define __put_user(x, ptr) \ __put_user_nocheck((x), (ptr), sizeof(*(ptr))) #define __ptr(x) ((unsigned long *)(x)) #define get_user(x, ptr) \ __get_user_check((x), (ptr), sizeof(*(ptr))) #define __get_user(x, ptr) \ __get_user_nocheck((x), (ptr), sizeof(*(ptr))) #define __put_user_nocheck(x, ptr, size) \ ({ \ long __pu_err = 0; \ typeof(*(ptr)) *__pu_addr = (ptr); \ typeof(*(ptr)) __pu_val = (typeof(*(ptr)))(x); \ if (__pu_addr) \ __put_user_size(__pu_val, (__pu_addr), (size), \ __pu_err); \ __pu_err; \ }) #define __put_user_check(x, ptr, size) \ ({ \ long __pu_err = -EFAULT; \ typeof(*(ptr)) *__pu_addr = (ptr); \ typeof(*(ptr)) __pu_val = (typeof(*(ptr)))(x); \ if (access_ok(__pu_addr, size) && __pu_addr) \ __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \ __pu_err; \ }) #define __put_user_size(x, ptr, size, retval) \ do { \ retval = 0; \ switch (size) { \ case 1: \ __put_user_asm_b(x, ptr, retval); \ break; \ case 2: \ __put_user_asm_h(x, ptr, retval); \ break; \ case 4: \ __put_user_asm_w(x, ptr, retval); \ break; \ case 8: \ __put_user_asm_64(x, ptr, retval); \ break; \ default: \ __put_user_bad(); \ } \ } while (0) /* * We don't tell gcc that we are accessing memory, but this is OK * because we do not write to any memory gcc knows about, so there * are no aliasing issues. * * Note that PC at a fault is the address *after* the faulting * instruction. */ #define __put_user_asm_b(x, ptr, err) \ do { \ int errcode; \ asm volatile( \ "1: stb %1, (%2,0) \n" \ " br 3f \n" \ "2: mov %0, %3 \n" \ " br 3f \n" \ ".section __ex_table, \"a\" \n" \ ".align 2 \n" \ ".long 1b,2b \n" \ ".previous \n" \ "3: \n" \ : "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \ : "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \ : "memory"); \ } while (0) #define __put_user_asm_h(x, ptr, err) \ do { \ int errcode; \ asm volatile( \ "1: sth %1, (%2,0) \n" \ " br 3f \n" \ "2: mov %0, %3 \n" \ " br 3f \n" \ ".section __ex_table, \"a\" \n" \ ".align 2 \n" \ ".long 1b,2b \n" \ ".previous \n" \ "3: \n" \ : "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \ : "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \ : "memory"); \ } while (0) #define __put_user_asm_w(x, ptr, err) \ do { \ int errcode; \ asm volatile( \ "1: stw %1, (%2,0) \n" \ " br 3f \n" \ "2: mov %0, %3 \n" \ " br 3f \n" \ ".section __ex_table,\"a\" \n" \ ".align 2 \n" \ ".long 1b, 2b \n" \ ".previous \n" \ "3: \n" \ : "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \ : "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \ : "memory"); \ } while (0) #define __put_user_asm_64(x, ptr, err) \ do { \ int tmp; \ int errcode; \ typeof(*(ptr))src = (typeof(*(ptr)))x; \ typeof(*(ptr))*psrc = &src; \ \ asm volatile( \ " ldw %3, (%1, 0) \n" \ "1: stw %3, (%2, 0) \n" \ " ldw %3, (%1, 4) \n" \ "2: stw %3, (%2, 4) \n" \ " br 4f \n" \ "3: mov %0, %4 \n" \ " br 4f \n" \ ".section __ex_table, \"a\" \n" \ ".align 2 \n" \ ".long 1b, 3b \n" \ ".long 2b, 3b \n" \ ".previous \n" \ "4: \n" \ : "=r"(err), "=r"(psrc), "=r"(ptr), \ "=r"(tmp), "=r"(errcode) \ : "0"(err), "1"(psrc), "2"(ptr), "3"(0), "4"(-EFAULT) \ : "memory"); \ } while (0) #define __get_user_nocheck(x, ptr, size) \ ({ \ long __gu_err; \ __get_user_size(x, (ptr), (size), __gu_err); \ __gu_err; \ }) #define __get_user_check(x, ptr, size) \ ({ \ int __gu_err = -EFAULT; \ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ if (access_ok(__gu_ptr, size) && __gu_ptr) \ __get_user_size(x, __gu_ptr, size, __gu_err); \ __gu_err; \ }) #define __get_user_size(x, ptr, size, retval) \ do { \ switch (size) { \ case 1: \ __get_user_asm_common((x), ptr, "ldb", retval); \ break; \ case 2: \ __get_user_asm_common((x), ptr, "ldh", retval); \ break; \ case 4: \ __get_user_asm_common((x), ptr, "ldw", retval); \ break; \ default: \ x = 0; \ (retval) = __get_user_bad(); \ } \ } while (0) #define __get_user_asm_common(x, ptr, ins, err) \ do { \ int errcode; \ asm volatile( \ "1: " ins " %1, (%4,0) \n" \ " br 3f \n" \ /* Fix up codes */ \ "2: mov %0, %2 \n" \ " movi %1, 0 \n" \ " br 3f \n" \ ".section __ex_table,\"a\" \n" \ ".align 2 \n" \ ".long 1b, 2b \n" \ ".previous \n" \ "3: \n" \ : "=r"(err), "=r"(x), "=r"(errcode) \ : "0"(0), "r"(ptr), "2"(-EFAULT) \ : "memory"); \ } while (0) extern int __get_user_bad(void); #define __copy_user(to, from, n) \ do { \ int w0, w1, w2, w3; \ asm volatile( \ "0: cmpnei %1, 0 \n" \ " bf 8f \n" \ " mov %3, %1 \n" \ " or %3, %2 \n" \ " andi %3, 3 \n" \ " cmpnei %3, 0 \n" \ " bf 1f \n" \ " br 5f \n" \ "1: cmplti %0, 16 \n" /* 4W */ \ " bt 3f \n" \ " ldw %3, (%2, 0) \n" \ " ldw %4, (%2, 4) \n" \ " ldw %5, (%2, 8) \n" \ " ldw %6, (%2, 12) \n" \ "2: stw %3, (%1, 0) \n" \ "9: stw %4, (%1, 4) \n" \ "10: stw %5, (%1, 8) \n" \ "11: stw %6, (%1, 12) \n" \ " addi %2, 16 \n" \ " addi %1, 16 \n" \ " subi %0, 16 \n" \ " br 1b \n" \ "3: cmplti %0, 4 \n" /* 1W */ \ " bt 5f \n" \ " ldw %3, (%2, 0) \n" \ "4: stw %3, (%1, 0) \n" \ " addi %2, 4 \n" \ " addi %1, 4 \n" \ " subi %0, 4 \n" \ " br 3b \n" \ "5: cmpnei %0, 0 \n" /* 1B */ \ " bf 8f \n" \ " ldb %3, (%2, 0) \n" \ "6: stb %3, (%1, 0) \n" \ " addi %2, 1 \n" \ " addi %1, 1 \n" \ " subi %0, 1 \n" \ " br 5b \n" \ "7: br 8f \n" \ ".section __ex_table, \"a\" \n" \ ".align 2 \n" \ ".long 2b, 7b \n" \ ".long 9b, 7b \n" \ ".long 10b, 7b \n" \ ".long 11b, 7b \n" \ ".long 4b, 7b \n" \ ".long 6b, 7b \n" \ ".previous \n" \ "8: \n" \ : "=r"(n), "=r"(to), "=r"(from), "=r"(w0), \ "=r"(w1), "=r"(w2), "=r"(w3) \ : "0"(n), "1"(to), "2"(from) \ : "memory"); \ } while (0) #define __copy_user_zeroing(to, from, n) \ do { \ int tmp; \ int nsave; \ asm volatile( \ "0: cmpnei %1, 0 \n" \ " bf 7f \n" \ " mov %3, %1 \n" \ " or %3, %2 \n" \ " andi %3, 3 \n" \ " cmpnei %3, 0 \n" \ " bf 1f \n" \ " br 5f \n" \ "1: cmplti %0, 16 \n" \ " bt 3f \n" \ "2: ldw %3, (%2, 0) \n" \ "10: ldw %4, (%2, 4) \n" \ " stw %3, (%1, 0) \n" \ " stw %4, (%1, 4) \n" \ "11: ldw %3, (%2, 8) \n" \ "12: ldw %4, (%2, 12) \n" \ " stw %3, (%1, 8) \n" \ " stw %4, (%1, 12) \n" \ " addi %2, 16 \n" \ " addi %1, 16 \n" \ " subi %0, 16 \n" \ " br 1b \n" \ "3: cmplti %0, 4 \n" \ " bt 5f \n" \ "4: ldw %3, (%2, 0) \n" \ " stw %3, (%1, 0) \n" \ " addi %2, 4 \n" \ " addi %1, 4 \n" \ " subi %0, 4 \n" \ " br 3b \n" \ "5: cmpnei %0, 0 \n" \ " bf 7f \n" \ "6: ldb %3, (%2, 0) \n" \ " stb %3, (%1, 0) \n" \ " addi %2, 1 \n" \ " addi %1, 1 \n" \ " subi %0, 1 \n" \ " br 5b \n" \ "8: mov %3, %0 \n" \ " movi %4, 0 \n" \ "9: stb %4, (%1, 0) \n" \ " addi %1, 1 \n" \ " subi %3, 1 \n" \ " cmpnei %3, 0 \n" \ " bt 9b \n" \ " br 7f \n" \ ".section __ex_table, \"a\" \n" \ ".align 2 \n" \ ".long 2b, 8b \n" \ ".long 10b, 8b \n" \ ".long 11b, 8b \n" \ ".long 12b, 8b \n" \ ".long 4b, 8b \n" \ ".long 6b, 8b \n" \ ".previous \n" \ "7: \n" \ : "=r"(n), "=r"(to), "=r"(from), "=r"(nsave), \ "=r"(tmp) \ : "0"(n), "1"(to), "2"(from) \ : "memory"); \ } while (0) unsigned long raw_copy_from_user(void *to, const void *from, unsigned long n); unsigned long raw_copy_to_user(void *to, const void *from, unsigned long n); unsigned long clear_user(void *to, unsigned long n); unsigned long __clear_user(void __user *to, unsigned long n); long strncpy_from_user(char *dst, const char *src, long count); long __strncpy_from_user(char *dst, const char *src, long count); /* * Return the size of a string (including the ending 0) * * Return 0 on exception, a value greater than N if too long */ long strnlen_user(const char *src, long n); #define strlen_user(str) strnlen_user(str, 32767) struct exception_table_entry { unsigned long insn; unsigned long nextinsn; }; extern int fixup_exception(struct pt_regs *regs); #endif /* __ASM_CSKY_UACCESS_H */ |