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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 | // SPDX-License-Identifier: GPL-2.0 /* * User address space access functions. * The non inlined parts of asm-m32r/uaccess.h are here. * * Copyright 1997 Andi Kleen <ak@muc.de> * Copyright 1997 Linus Torvalds * Copyright 2001, 2002, 2004 Hirokazu Takata */ #include <linux/prefetch.h> #include <linux/string.h> #include <linux/thread_info.h> #include <linux/uaccess.h> /* * Copy a null terminated string from userspace. */ #ifdef CONFIG_ISA_DUAL_ISSUE #define __do_strncpy_from_user(dst,src,count,res) \ do { \ int __d0, __d1, __d2; \ __asm__ __volatile__( \ " beqz %1, 2f\n" \ " .fillinsn\n" \ "0: ldb r14, @%3 || addi %3, #1\n" \ " stb r14, @%4 || addi %4, #1\n" \ " beqz r14, 1f\n" \ " addi %1, #-1\n" \ " bnez %1, 0b\n" \ " .fillinsn\n" \ "1: sub %0, %1\n" \ " .fillinsn\n" \ "2:\n" \ ".section .fixup,\"ax\"\n" \ " .balign 4\n" \ "3: seth r14, #high(2b)\n" \ " or3 r14, r14, #low(2b)\n" \ " jmp r14 || ldi %0, #%5\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .balign 4\n" \ " .long 0b,3b\n" \ ".previous" \ : "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \ "=&r" (__d2) \ : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \ "4"(dst) \ : "r14", "cbit", "memory"); \ } while (0) #else /* not CONFIG_ISA_DUAL_ISSUE */ #define __do_strncpy_from_user(dst,src,count,res) \ do { \ int __d0, __d1, __d2; \ __asm__ __volatile__( \ " beqz %1, 2f\n" \ " .fillinsn\n" \ "0: ldb r14, @%3\n" \ " stb r14, @%4\n" \ " addi %3, #1\n" \ " addi %4, #1\n" \ " beqz r14, 1f\n" \ " addi %1, #-1\n" \ " bnez %1, 0b\n" \ " .fillinsn\n" \ "1: sub %0, %1\n" \ " .fillinsn\n" \ "2:\n" \ ".section .fixup,\"ax\"\n" \ " .balign 4\n" \ "3: ldi %0, #%5\n" \ " seth r14, #high(2b)\n" \ " or3 r14, r14, #low(2b)\n" \ " jmp r14\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .balign 4\n" \ " .long 0b,3b\n" \ ".previous" \ : "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \ "=&r" (__d2) \ : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \ "4"(dst) \ : "r14", "cbit", "memory"); \ } while (0) #endif /* CONFIG_ISA_DUAL_ISSUE */ long strncpy_from_user(char *dst, const char __user *src, long count) { long res = -EFAULT; if (access_ok(VERIFY_READ, src, 1)) __do_strncpy_from_user(dst, src, count, res); return res; } /* * Zero Userspace */ #ifdef CONFIG_ISA_DUAL_ISSUE #define __do_clear_user(addr,size) \ do { \ int __dst, __c; \ __asm__ __volatile__( \ " beqz %1, 9f\n" \ " and3 r14, %0, #3\n" \ " bnez r14, 2f\n" \ " and3 r14, %1, #3\n" \ " bnez r14, 2f\n" \ " and3 %1, %1, #3\n" \ " beqz %2, 2f\n" \ " addi %0, #-4\n" \ " .fillinsn\n" \ "0: ; word clear \n" \ " st %6, @+%0 || addi %2, #-1\n" \ " bnez %2, 0b\n" \ " beqz %1, 9f\n" \ " .fillinsn\n" \ "2: ; byte clear \n" \ " stb %6, @%0 || addi %1, #-1\n" \ " addi %0, #1\n" \ " bnez %1, 2b\n" \ " .fillinsn\n" \ "9:\n" \ ".section .fixup,\"ax\"\n" \ " .balign 4\n" \ "4: slli %2, #2\n" \ " seth r14, #high(9b)\n" \ " or3 r14, r14, #low(9b)\n" \ " jmp r14 || add %1, %2\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .balign 4\n" \ " .long 0b,4b\n" \ " .long 2b,9b\n" \ ".previous\n" \ : "=&r"(__dst), "=&r"(size), "=&r"(__c) \ : "0"(addr), "1"(size), "2"(size / 4), "r"(0) \ : "r14", "cbit", "memory"); \ } while (0) #else /* not CONFIG_ISA_DUAL_ISSUE */ #define __do_clear_user(addr,size) \ do { \ int __dst, __c; \ __asm__ __volatile__( \ " beqz %1, 9f\n" \ " and3 r14, %0, #3\n" \ " bnez r14, 2f\n" \ " and3 r14, %1, #3\n" \ " bnez r14, 2f\n" \ " and3 %1, %1, #3\n" \ " beqz %2, 2f\n" \ " addi %0, #-4\n" \ " .fillinsn\n" \ "0: st %6, @+%0 ; word clear \n" \ " addi %2, #-1\n" \ " bnez %2, 0b\n" \ " beqz %1, 9f\n" \ " .fillinsn\n" \ "2: stb %6, @%0 ; byte clear \n" \ " addi %1, #-1\n" \ " addi %0, #1\n" \ " bnez %1, 2b\n" \ " .fillinsn\n" \ "9:\n" \ ".section .fixup,\"ax\"\n" \ " .balign 4\n" \ "4: slli %2, #2\n" \ " add %1, %2\n" \ " seth r14, #high(9b)\n" \ " or3 r14, r14, #low(9b)\n" \ " jmp r14\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .balign 4\n" \ " .long 0b,4b\n" \ " .long 2b,9b\n" \ ".previous\n" \ : "=&r"(__dst), "=&r"(size), "=&r"(__c) \ : "0"(addr), "1"(size), "2"(size / 4), "r"(0) \ : "r14", "cbit", "memory"); \ } while (0) #endif /* not CONFIG_ISA_DUAL_ISSUE */ unsigned long clear_user(void __user *to, unsigned long n) { if (access_ok(VERIFY_WRITE, to, n)) __do_clear_user(to, n); return n; } unsigned long __clear_user(void __user *to, unsigned long n) { __do_clear_user(to, n); return n; } /* * Return the size of a string (including the ending 0) * * Return 0 on exception, a value greater than N if too long */ #ifdef CONFIG_ISA_DUAL_ISSUE long strnlen_user(const char __user *s, long n) { unsigned long mask = -__addr_ok(s); unsigned long res; __asm__ __volatile__( " and %0, %5 || mv r1, %1\n" " beqz %0, strnlen_exit\n" " and3 r0, %1, #3\n" " bnez r0, strnlen_byte_loop\n" " cmpui %0, #4\n" " bc strnlen_byte_loop\n" "strnlen_word_loop:\n" "0: ld r0, @%1+\n" " pcmpbz r0\n" " bc strnlen_last_bytes_fixup\n" " addi %0, #-4\n" " beqz %0, strnlen_exit\n" " bgtz %0, strnlen_word_loop\n" "strnlen_last_bytes:\n" " mv %0, %4\n" "strnlen_last_bytes_fixup:\n" " addi %1, #-4\n" "strnlen_byte_loop:\n" "1: ldb r0, @%1 || addi %0, #-1\n" " beqz r0, strnlen_exit\n" " addi %1, #1\n" " bnez %0, strnlen_byte_loop\n" "strnlen_exit:\n" " sub %1, r1\n" " add3 %0, %1, #1\n" " .fillinsn\n" "9:\n" ".section .fixup,\"ax\"\n" " .balign 4\n" "4: addi %1, #-4\n" " .fillinsn\n" "5: seth r1, #high(9b)\n" " or3 r1, r1, #low(9b)\n" " jmp r1 || ldi %0, #0\n" ".previous\n" ".section __ex_table,\"a\"\n" " .balign 4\n" " .long 0b,4b\n" " .long 1b,5b\n" ".previous" : "=&r" (res), "=r" (s) : "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101) : "r0", "r1", "cbit"); /* NOTE: strnlen_user() algorithm: * { * char *p; * for (p = s; n-- && *p != '\0'; ++p) * ; * return p - s + 1; * } */ /* NOTE: If a null char. exists, return 0. * if ((x - 0x01010101) & ~x & 0x80808080)\n" * return 0;\n" */ return res & mask; } #else /* not CONFIG_ISA_DUAL_ISSUE */ long strnlen_user(const char __user *s, long n) { unsigned long mask = -__addr_ok(s); unsigned long res; __asm__ __volatile__( " and %0, %5\n" " mv r1, %1\n" " beqz %0, strnlen_exit\n" " and3 r0, %1, #3\n" " bnez r0, strnlen_byte_loop\n" " cmpui %0, #4\n" " bc strnlen_byte_loop\n" " sll3 r3, %6, #7\n" "strnlen_word_loop:\n" "0: ld r0, @%1+\n" " not r2, r0\n" " sub r0, %6\n" " and r2, r3\n" " and r2, r0\n" " bnez r2, strnlen_last_bytes_fixup\n" " addi %0, #-4\n" " beqz %0, strnlen_exit\n" " bgtz %0, strnlen_word_loop\n" "strnlen_last_bytes:\n" " mv %0, %4\n" "strnlen_last_bytes_fixup:\n" " addi %1, #-4\n" "strnlen_byte_loop:\n" "1: ldb r0, @%1\n" " addi %0, #-1\n" " beqz r0, strnlen_exit\n" " addi %1, #1\n" " bnez %0, strnlen_byte_loop\n" "strnlen_exit:\n" " sub %1, r1\n" " add3 %0, %1, #1\n" " .fillinsn\n" "9:\n" ".section .fixup,\"ax\"\n" " .balign 4\n" "4: addi %1, #-4\n" " .fillinsn\n" "5: ldi %0, #0\n" " seth r1, #high(9b)\n" " or3 r1, r1, #low(9b)\n" " jmp r1\n" ".previous\n" ".section __ex_table,\"a\"\n" " .balign 4\n" " .long 0b,4b\n" " .long 1b,5b\n" ".previous" : "=&r" (res), "=r" (s) : "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101) : "r0", "r1", "r2", "r3", "cbit"); /* NOTE: strnlen_user() algorithm: * { * char *p; * for (p = s; n-- && *p != '\0'; ++p) * ; * return p - s + 1; * } */ /* NOTE: If a null char. exists, return 0. * if ((x - 0x01010101) & ~x & 0x80808080)\n" * return 0;\n" */ return res & mask; } #endif /* CONFIG_ISA_DUAL_ISSUE */ |