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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 | /* SPDX-License-Identifier: GPL-2.0 */ /* * S390 version * Copyright IBM Corp. 1999, 2000 * Author(s): Hartmut Penner (hp@de.ibm.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) * * Derived from "include/asm-i386/uaccess.h" */ #ifndef __S390_UACCESS_H #define __S390_UACCESS_H /* * User space memory access functions */ #include <asm/asm-extable.h> #include <asm/processor.h> #include <asm/ctl_reg.h> #include <asm/extable.h> #include <asm/facility.h> #include <asm-generic/access_ok.h> void debug_user_asce(int exit); unsigned long __must_check raw_copy_from_user(void *to, const void __user *from, unsigned long n); unsigned long __must_check raw_copy_to_user(void __user *to, const void *from, unsigned long n); #ifndef CONFIG_KASAN #define INLINE_COPY_FROM_USER #define INLINE_COPY_TO_USER #endif unsigned long __must_check _copy_from_user_key(void *to, const void __user *from, unsigned long n, unsigned long key); static __always_inline unsigned long __must_check copy_from_user_key(void *to, const void __user *from, unsigned long n, unsigned long key) { if (check_copy_size(to, n, false)) n = _copy_from_user_key(to, from, n, key); return n; } unsigned long __must_check _copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned long key); static __always_inline unsigned long __must_check copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned long key) { if (check_copy_size(from, n, true)) n = _copy_to_user_key(to, from, n, key); return n; } union oac { unsigned int val; struct { struct { unsigned short key : 4; unsigned short : 4; unsigned short as : 2; unsigned short : 4; unsigned short k : 1; unsigned short a : 1; } oac1; struct { unsigned short key : 4; unsigned short : 4; unsigned short as : 2; unsigned short : 4; unsigned short k : 1; unsigned short a : 1; } oac2; }; }; int __noreturn __put_user_bad(void); #define __put_user_asm(to, from, size) \ ({ \ union oac __oac_spec = { \ .oac1.as = PSW_BITS_AS_SECONDARY, \ .oac1.a = 1, \ }; \ int __rc; \ \ asm volatile( \ " lr 0,%[spec]\n" \ "0: mvcos %[_to],%[_from],%[_size]\n" \ "1: xr %[rc],%[rc]\n" \ "2:\n" \ EX_TABLE_UA_STORE(0b, 2b, %[rc]) \ EX_TABLE_UA_STORE(1b, 2b, %[rc]) \ : [rc] "=&d" (__rc), [_to] "+Q" (*(to)) \ : [_size] "d" (size), [_from] "Q" (*(from)), \ [spec] "d" (__oac_spec.val) \ : "cc", "0"); \ __rc; \ }) static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size) { int rc; switch (size) { case 1: rc = __put_user_asm((unsigned char __user *)ptr, (unsigned char *)x, size); break; case 2: rc = __put_user_asm((unsigned short __user *)ptr, (unsigned short *)x, size); break; case 4: rc = __put_user_asm((unsigned int __user *)ptr, (unsigned int *)x, size); break; case 8: rc = __put_user_asm((unsigned long __user *)ptr, (unsigned long *)x, size); break; default: __put_user_bad(); break; } return rc; } int __noreturn __get_user_bad(void); #define __get_user_asm(to, from, size) \ ({ \ union oac __oac_spec = { \ .oac2.as = PSW_BITS_AS_SECONDARY, \ .oac2.a = 1, \ }; \ int __rc; \ \ asm volatile( \ " lr 0,%[spec]\n" \ "0: mvcos 0(%[_to]),%[_from],%[_size]\n" \ "1: xr %[rc],%[rc]\n" \ "2:\n" \ EX_TABLE_UA_LOAD_MEM(0b, 2b, %[rc], %[_to], %[_ksize]) \ EX_TABLE_UA_LOAD_MEM(1b, 2b, %[rc], %[_to], %[_ksize]) \ : [rc] "=&d" (__rc), "=Q" (*(to)) \ : [_size] "d" (size), [_from] "Q" (*(from)), \ [spec] "d" (__oac_spec.val), [_to] "a" (to), \ [_ksize] "K" (size) \ : "cc", "0"); \ __rc; \ }) static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size) { int rc; switch (size) { case 1: rc = __get_user_asm((unsigned char *)x, (unsigned char __user *)ptr, size); break; case 2: rc = __get_user_asm((unsigned short *)x, (unsigned short __user *)ptr, size); break; case 4: rc = __get_user_asm((unsigned int *)x, (unsigned int __user *)ptr, size); break; case 8: rc = __get_user_asm((unsigned long *)x, (unsigned long __user *)ptr, size); break; default: __get_user_bad(); break; } return rc; } /* * These are the main single-value transfer routines. They automatically * use the right size if we just have the right pointer type. */ #define __put_user(x, ptr) \ ({ \ __typeof__(*(ptr)) __x = (x); \ int __pu_err = -EFAULT; \ \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ case 1: \ case 2: \ case 4: \ case 8: \ __pu_err = __put_user_fn(&__x, ptr, sizeof(*(ptr))); \ break; \ default: \ __put_user_bad(); \ break; \ } \ __builtin_expect(__pu_err, 0); \ }) #define put_user(x, ptr) \ ({ \ might_fault(); \ __put_user(x, ptr); \ }) #define __get_user(x, ptr) \ ({ \ int __gu_err = -EFAULT; \ \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ case 1: { \ unsigned char __x; \ \ __gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \ (x) = *(__force __typeof__(*(ptr)) *)&__x; \ break; \ }; \ case 2: { \ unsigned short __x; \ \ __gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \ (x) = *(__force __typeof__(*(ptr)) *)&__x; \ break; \ }; \ case 4: { \ unsigned int __x; \ \ __gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \ (x) = *(__force __typeof__(*(ptr)) *)&__x; \ break; \ }; \ case 8: { \ unsigned long __x; \ \ __gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \ (x) = *(__force __typeof__(*(ptr)) *)&__x; \ break; \ }; \ default: \ __get_user_bad(); \ break; \ } \ __builtin_expect(__gu_err, 0); \ }) #define get_user(x, ptr) \ ({ \ might_fault(); \ __get_user(x, ptr); \ }) /* * Copy a null terminated string from userspace. */ long __must_check strncpy_from_user(char *dst, const char __user *src, long count); long __must_check strnlen_user(const char __user *src, long count); /* * Zero Userspace */ unsigned long __must_check __clear_user(void __user *to, unsigned long size); static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) { might_fault(); return __clear_user(to, n); } void *s390_kernel_write(void *dst, const void *src, size_t size); int __noreturn __put_kernel_bad(void); #define __put_kernel_asm(val, to, insn) \ ({ \ int __rc; \ \ asm volatile( \ "0: " insn " %[_val],%[_to]\n" \ "1: xr %[rc],%[rc]\n" \ "2:\n" \ EX_TABLE_UA_STORE(0b, 2b, %[rc]) \ EX_TABLE_UA_STORE(1b, 2b, %[rc]) \ : [rc] "=d" (__rc), [_to] "+Q" (*(to)) \ : [_val] "d" (val) \ : "cc"); \ __rc; \ }) #define __put_kernel_nofault(dst, src, type, err_label) \ do { \ unsigned long __x = (unsigned long)(*((type *)(src))); \ int __pk_err; \ \ switch (sizeof(type)) { \ case 1: \ __pk_err = __put_kernel_asm(__x, (type *)(dst), "stc"); \ break; \ case 2: \ __pk_err = __put_kernel_asm(__x, (type *)(dst), "sth"); \ break; \ case 4: \ __pk_err = __put_kernel_asm(__x, (type *)(dst), "st"); \ break; \ case 8: \ __pk_err = __put_kernel_asm(__x, (type *)(dst), "stg"); \ break; \ default: \ __pk_err = __put_kernel_bad(); \ break; \ } \ if (unlikely(__pk_err)) \ goto err_label; \ } while (0) int __noreturn __get_kernel_bad(void); #define __get_kernel_asm(val, from, insn) \ ({ \ int __rc; \ \ asm volatile( \ "0: " insn " %[_val],%[_from]\n" \ "1: xr %[rc],%[rc]\n" \ "2:\n" \ EX_TABLE_UA_LOAD_REG(0b, 2b, %[rc], %[_val]) \ EX_TABLE_UA_LOAD_REG(1b, 2b, %[rc], %[_val]) \ : [rc] "=d" (__rc), [_val] "=d" (val) \ : [_from] "Q" (*(from)) \ : "cc"); \ __rc; \ }) #define __get_kernel_nofault(dst, src, type, err_label) \ do { \ int __gk_err; \ \ switch (sizeof(type)) { \ case 1: { \ unsigned char __x; \ \ __gk_err = __get_kernel_asm(__x, (type *)(src), "ic"); \ *((type *)(dst)) = (type)__x; \ break; \ }; \ case 2: { \ unsigned short __x; \ \ __gk_err = __get_kernel_asm(__x, (type *)(src), "lh"); \ *((type *)(dst)) = (type)__x; \ break; \ }; \ case 4: { \ unsigned int __x; \ \ __gk_err = __get_kernel_asm(__x, (type *)(src), "l"); \ *((type *)(dst)) = (type)__x; \ break; \ }; \ case 8: { \ unsigned long __x; \ \ __gk_err = __get_kernel_asm(__x, (type *)(src), "lg"); \ *((type *)(dst)) = (type)__x; \ break; \ }; \ default: \ __gk_err = __get_kernel_bad(); \ break; \ } \ if (unlikely(__gk_err)) \ goto err_label; \ } while (0) #endif /* __S390_UACCESS_H */ |