Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 1 | #ifndef _ARCH_POWERPC_UACCESS_H |
| 2 | #define _ARCH_POWERPC_UACCESS_H |
| 3 | |
| 4 | #ifdef __KERNEL__ |
| 5 | #ifndef __ASSEMBLY__ |
| 6 | |
| 7 | #include <linux/sched.h> |
| 8 | #include <linux/errno.h> |
| 9 | #include <asm/processor.h> |
Paul Mackerras | 6bfd93c | 2006-05-03 23:02:04 +1000 | [diff] [blame] | 10 | #include <asm/page.h> |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 11 | |
| 12 | #define VERIFY_READ 0 |
| 13 | #define VERIFY_WRITE 1 |
| 14 | |
| 15 | /* |
| 16 | * The fs value determines whether argument validity checking should be |
| 17 | * performed or not. If get_fs() == USER_DS, checking is performed, with |
| 18 | * get_fs() == KERNEL_DS, checking is bypassed. |
| 19 | * |
| 20 | * For historical reasons, these macros are grossly misnamed. |
| 21 | * |
| 22 | * The fs/ds values are now the highest legal address in the "segment". |
| 23 | * This simplifies the checking in the routines below. |
| 24 | */ |
| 25 | |
| 26 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) |
| 27 | |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 28 | #define KERNEL_DS MAKE_MM_SEG(~0UL) |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 29 | #ifdef __powerpc64__ |
| 30 | /* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */ |
| 31 | #define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1) |
| 32 | #else |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 33 | #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) |
| 34 | #endif |
| 35 | |
| 36 | #define get_ds() (KERNEL_DS) |
| 37 | #define get_fs() (current->thread.fs) |
| 38 | #define set_fs(val) (current->thread.fs = (val)) |
| 39 | |
| 40 | #define segment_eq(a, b) ((a).seg == (b).seg) |
| 41 | |
| 42 | #ifdef __powerpc64__ |
| 43 | /* |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 44 | * This check is sufficient because there is a large enough |
| 45 | * gap between user addresses and the kernel addresses |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 46 | */ |
| 47 | #define __access_ok(addr, size, segment) \ |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 48 | (((addr) <= (segment).seg) && ((size) <= (segment).seg)) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 49 | |
| 50 | #else |
| 51 | |
| 52 | #define __access_ok(addr, size, segment) \ |
| 53 | (((addr) <= (segment).seg) && \ |
| 54 | (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr))))) |
| 55 | |
| 56 | #endif |
| 57 | |
| 58 | #define access_ok(type, addr, size) \ |
| 59 | (__chk_user_ptr(addr), \ |
| 60 | __access_ok((__force unsigned long)(addr), (size), get_fs())) |
| 61 | |
| 62 | /* |
| 63 | * The exception table consists of pairs of addresses: the first is the |
| 64 | * address of an instruction that is allowed to fault, and the second is |
| 65 | * the address at which the program should continue. No registers are |
| 66 | * modified, so it is entirely up to the continuation code to figure out |
| 67 | * what to do. |
| 68 | * |
| 69 | * All the routines below use bits of fixup code that are out of line |
| 70 | * with the main instruction path. This means when everything is well, |
| 71 | * we don't even have to jump over them. Further, they do not intrude |
| 72 | * on our cache or tlb entries. |
| 73 | */ |
| 74 | |
| 75 | struct exception_table_entry { |
| 76 | unsigned long insn; |
| 77 | unsigned long fixup; |
| 78 | }; |
| 79 | |
| 80 | /* |
| 81 | * These are the main single-value transfer routines. They automatically |
| 82 | * use the right size if we just have the right pointer type. |
| 83 | * |
| 84 | * This gets kind of ugly. We want to return _two_ values in "get_user()" |
| 85 | * and yet we don't want to do any pointers, because that is too much |
| 86 | * of a performance impact. Thus we have a few rather ugly macros here, |
| 87 | * and hide all the ugliness from the user. |
| 88 | * |
| 89 | * The "__xxx" versions of the user access functions are versions that |
| 90 | * do not verify the address space, that must have been done previously |
| 91 | * with a separate "access_ok()" call (this is used when we do multiple |
| 92 | * accesses to the same area of user memory). |
| 93 | * |
| 94 | * As we use the same address space for kernel and user data on the |
| 95 | * PowerPC, we can just do these as direct assignments. (Of course, the |
| 96 | * exception handling means that it's no longer "just"...) |
| 97 | * |
| 98 | * The "user64" versions of the user access functions are versions that |
| 99 | * allow access of 64-bit data. The "get_user" functions do not |
| 100 | * properly handle 64-bit data because the value gets down cast to a long. |
| 101 | * The "put_user" functions already handle 64-bit data properly but we add |
| 102 | * "user64" versions for completeness |
| 103 | */ |
| 104 | #define get_user(x, ptr) \ |
| 105 | __get_user_check((x), (ptr), sizeof(*(ptr))) |
| 106 | #define put_user(x, ptr) \ |
| 107 | __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) |
| 108 | |
| 109 | #define __get_user(x, ptr) \ |
| 110 | __get_user_nocheck((x), (ptr), sizeof(*(ptr))) |
| 111 | #define __put_user(x, ptr) \ |
| 112 | __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) |
| 113 | #ifndef __powerpc64__ |
| 114 | #define __get_user64(x, ptr) \ |
| 115 | __get_user64_nocheck((x), (ptr), sizeof(*(ptr))) |
| 116 | #define __put_user64(x, ptr) __put_user(x, ptr) |
| 117 | #endif |
| 118 | |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 119 | #define __get_user_unaligned __get_user |
| 120 | #define __put_user_unaligned __put_user |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 121 | |
| 122 | extern long __put_user_bad(void); |
| 123 | |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 124 | /* |
| 125 | * We don't tell gcc that we are accessing memory, but this is OK |
| 126 | * because we do not write to any memory gcc knows about, so there |
| 127 | * are no aliasing issues. |
| 128 | */ |
| 129 | #define __put_user_asm(x, addr, err, op) \ |
| 130 | __asm__ __volatile__( \ |
| 131 | "1: " op " %1,0(%2) # put_user\n" \ |
| 132 | "2:\n" \ |
| 133 | ".section .fixup,\"ax\"\n" \ |
| 134 | "3: li %0,%3\n" \ |
| 135 | " b 2b\n" \ |
| 136 | ".previous\n" \ |
| 137 | ".section __ex_table,\"a\"\n" \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 138 | " .balign %5\n" \ |
| 139 | PPC_LONG "1b,3b\n" \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 140 | ".previous" \ |
| 141 | : "=r" (err) \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 142 | : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err),\ |
| 143 | "i"(sizeof(unsigned long))) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 144 | |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 145 | #ifdef __powerpc64__ |
| 146 | #define __put_user_asm2(x, ptr, retval) \ |
| 147 | __put_user_asm(x, ptr, retval, "std") |
| 148 | #else /* __powerpc64__ */ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 149 | #define __put_user_asm2(x, addr, err) \ |
| 150 | __asm__ __volatile__( \ |
| 151 | "1: stw %1,0(%2)\n" \ |
| 152 | "2: stw %1+1,4(%2)\n" \ |
| 153 | "3:\n" \ |
| 154 | ".section .fixup,\"ax\"\n" \ |
| 155 | "4: li %0,%3\n" \ |
| 156 | " b 3b\n" \ |
| 157 | ".previous\n" \ |
| 158 | ".section __ex_table,\"a\"\n" \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 159 | " .balign %5\n" \ |
| 160 | PPC_LONG "1b,4b\n" \ |
| 161 | PPC_LONG "2b,4b\n" \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 162 | ".previous" \ |
| 163 | : "=r" (err) \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 164 | : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err),\ |
| 165 | "i"(sizeof(unsigned long))) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 166 | #endif /* __powerpc64__ */ |
| 167 | |
| 168 | #define __put_user_size(x, ptr, size, retval) \ |
| 169 | do { \ |
| 170 | retval = 0; \ |
| 171 | switch (size) { \ |
| 172 | case 1: __put_user_asm(x, ptr, retval, "stb"); break; \ |
| 173 | case 2: __put_user_asm(x, ptr, retval, "sth"); break; \ |
| 174 | case 4: __put_user_asm(x, ptr, retval, "stw"); break; \ |
| 175 | case 8: __put_user_asm2(x, ptr, retval); break; \ |
| 176 | default: __put_user_bad(); \ |
| 177 | } \ |
| 178 | } while (0) |
| 179 | |
| 180 | #define __put_user_nocheck(x, ptr, size) \ |
| 181 | ({ \ |
| 182 | long __pu_err; \ |
Paul Mackerras | 6bfd93c | 2006-05-03 23:02:04 +1000 | [diff] [blame] | 183 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
| 184 | if (!is_kernel_addr((unsigned long)__pu_addr)) \ |
| 185 | might_sleep(); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 186 | __chk_user_ptr(ptr); \ |
Paul Mackerras | 6bfd93c | 2006-05-03 23:02:04 +1000 | [diff] [blame] | 187 | __put_user_size((x), __pu_addr, (size), __pu_err); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 188 | __pu_err; \ |
| 189 | }) |
| 190 | |
| 191 | #define __put_user_check(x, ptr, size) \ |
| 192 | ({ \ |
| 193 | long __pu_err = -EFAULT; \ |
| 194 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
| 195 | might_sleep(); \ |
| 196 | if (access_ok(VERIFY_WRITE, __pu_addr, size)) \ |
| 197 | __put_user_size((x), __pu_addr, (size), __pu_err); \ |
| 198 | __pu_err; \ |
| 199 | }) |
| 200 | |
| 201 | extern long __get_user_bad(void); |
| 202 | |
| 203 | #define __get_user_asm(x, addr, err, op) \ |
| 204 | __asm__ __volatile__( \ |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 205 | "1: "op" %1,0(%2) # get_user\n" \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 206 | "2:\n" \ |
| 207 | ".section .fixup,\"ax\"\n" \ |
| 208 | "3: li %0,%3\n" \ |
| 209 | " li %1,0\n" \ |
| 210 | " b 2b\n" \ |
| 211 | ".previous\n" \ |
| 212 | ".section __ex_table,\"a\"\n" \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 213 | " .balign %5\n" \ |
| 214 | PPC_LONG "1b,3b\n" \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 215 | ".previous" \ |
| 216 | : "=r" (err), "=r" (x) \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 217 | : "b" (addr), "i" (-EFAULT), "0" (err), \ |
| 218 | "i"(sizeof(unsigned long))) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 219 | |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 220 | #ifdef __powerpc64__ |
| 221 | #define __get_user_asm2(x, addr, err) \ |
| 222 | __get_user_asm(x, addr, err, "ld") |
| 223 | #else /* __powerpc64__ */ |
| 224 | #define __get_user_asm2(x, addr, err) \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 225 | __asm__ __volatile__( \ |
| 226 | "1: lwz %1,0(%2)\n" \ |
| 227 | "2: lwz %1+1,4(%2)\n" \ |
| 228 | "3:\n" \ |
| 229 | ".section .fixup,\"ax\"\n" \ |
| 230 | "4: li %0,%3\n" \ |
| 231 | " li %1,0\n" \ |
| 232 | " li %1+1,0\n" \ |
| 233 | " b 3b\n" \ |
| 234 | ".previous\n" \ |
| 235 | ".section __ex_table,\"a\"\n" \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 236 | " .balign %5\n" \ |
| 237 | PPC_LONG "1b,4b\n" \ |
| 238 | PPC_LONG "2b,4b\n" \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 239 | ".previous" \ |
| 240 | : "=r" (err), "=&r" (x) \ |
David Gibson | 3ddfbcf | 2005-11-10 12:56:55 +1100 | [diff] [blame] | 241 | : "b" (addr), "i" (-EFAULT), "0" (err), \ |
| 242 | "i"(sizeof(unsigned long))) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 243 | #endif /* __powerpc64__ */ |
| 244 | |
| 245 | #define __get_user_size(x, ptr, size, retval) \ |
| 246 | do { \ |
| 247 | retval = 0; \ |
| 248 | __chk_user_ptr(ptr); \ |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 249 | if (size > sizeof(x)) \ |
| 250 | (x) = __get_user_bad(); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 251 | switch (size) { \ |
| 252 | case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \ |
| 253 | case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \ |
| 254 | case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \ |
| 255 | case 8: __get_user_asm2(x, ptr, retval); break; \ |
| 256 | default: (x) = __get_user_bad(); \ |
| 257 | } \ |
| 258 | } while (0) |
| 259 | |
| 260 | #define __get_user_nocheck(x, ptr, size) \ |
| 261 | ({ \ |
| 262 | long __gu_err; \ |
| 263 | unsigned long __gu_val; \ |
Paul Mackerras | 6bfd93c | 2006-05-03 23:02:04 +1000 | [diff] [blame] | 264 | const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 265 | __chk_user_ptr(ptr); \ |
Paul Mackerras | 6bfd93c | 2006-05-03 23:02:04 +1000 | [diff] [blame] | 266 | if (!is_kernel_addr((unsigned long)__gu_addr)) \ |
| 267 | might_sleep(); \ |
| 268 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 269 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
| 270 | __gu_err; \ |
| 271 | }) |
| 272 | |
| 273 | #ifndef __powerpc64__ |
| 274 | #define __get_user64_nocheck(x, ptr, size) \ |
| 275 | ({ \ |
| 276 | long __gu_err; \ |
| 277 | long long __gu_val; \ |
Paul Mackerras | 6bfd93c | 2006-05-03 23:02:04 +1000 | [diff] [blame] | 278 | const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 279 | __chk_user_ptr(ptr); \ |
Paul Mackerras | 6bfd93c | 2006-05-03 23:02:04 +1000 | [diff] [blame] | 280 | if (!is_kernel_addr((unsigned long)__gu_addr)) \ |
| 281 | might_sleep(); \ |
| 282 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 283 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
| 284 | __gu_err; \ |
| 285 | }) |
| 286 | #endif /* __powerpc64__ */ |
| 287 | |
| 288 | #define __get_user_check(x, ptr, size) \ |
| 289 | ({ \ |
| 290 | long __gu_err = -EFAULT; \ |
| 291 | unsigned long __gu_val = 0; \ |
| 292 | const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 293 | might_sleep(); \ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 294 | if (access_ok(VERIFY_READ, __gu_addr, (size))) \ |
| 295 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ |
| 296 | (x) = (__typeof__(*(ptr)))__gu_val; \ |
| 297 | __gu_err; \ |
| 298 | }) |
| 299 | |
| 300 | /* more complex routines */ |
| 301 | |
| 302 | extern unsigned long __copy_tofrom_user(void __user *to, |
| 303 | const void __user *from, unsigned long size); |
| 304 | |
| 305 | #ifndef __powerpc64__ |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 306 | |
Adrian Bunk | 4cfbdff | 2006-12-01 12:53:18 +0100 | [diff] [blame^] | 307 | static inline unsigned long copy_from_user(void *to, |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 308 | const void __user *from, unsigned long n) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 309 | { |
| 310 | unsigned long over; |
| 311 | |
| 312 | if (access_ok(VERIFY_READ, from, n)) |
| 313 | return __copy_tofrom_user((__force void __user *)to, from, n); |
| 314 | if ((unsigned long)from < TASK_SIZE) { |
| 315 | over = (unsigned long)from + n - TASK_SIZE; |
| 316 | return __copy_tofrom_user((__force void __user *)to, from, |
| 317 | n - over) + over; |
| 318 | } |
| 319 | return n; |
| 320 | } |
| 321 | |
Adrian Bunk | 4cfbdff | 2006-12-01 12:53:18 +0100 | [diff] [blame^] | 322 | static inline unsigned long copy_to_user(void __user *to, |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 323 | const void *from, unsigned long n) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 324 | { |
| 325 | unsigned long over; |
| 326 | |
| 327 | if (access_ok(VERIFY_WRITE, to, n)) |
| 328 | return __copy_tofrom_user(to, (__force void __user *)from, n); |
| 329 | if ((unsigned long)to < TASK_SIZE) { |
| 330 | over = (unsigned long)to + n - TASK_SIZE; |
| 331 | return __copy_tofrom_user(to, (__force void __user *)from, |
| 332 | n - over) + over; |
| 333 | } |
| 334 | return n; |
| 335 | } |
| 336 | |
| 337 | #else /* __powerpc64__ */ |
| 338 | |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 339 | #define __copy_in_user(to, from, size) \ |
| 340 | __copy_tofrom_user((to), (from), (size)) |
| 341 | |
| 342 | extern unsigned long copy_from_user(void *to, const void __user *from, |
| 343 | unsigned long n); |
| 344 | extern unsigned long copy_to_user(void __user *to, const void *from, |
| 345 | unsigned long n); |
| 346 | extern unsigned long copy_in_user(void __user *to, const void __user *from, |
| 347 | unsigned long n); |
| 348 | |
Stephen Rothwell | 48fe487 | 2005-11-01 15:53:19 +1100 | [diff] [blame] | 349 | #endif /* __powerpc64__ */ |
| 350 | |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 351 | static inline unsigned long __copy_from_user_inatomic(void *to, |
| 352 | const void __user *from, unsigned long n) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 353 | { |
| 354 | if (__builtin_constant_p(n) && (n <= 8)) { |
| 355 | unsigned long ret; |
| 356 | |
| 357 | switch (n) { |
| 358 | case 1: |
| 359 | __get_user_size(*(u8 *)to, from, 1, ret); |
| 360 | break; |
| 361 | case 2: |
| 362 | __get_user_size(*(u16 *)to, from, 2, ret); |
| 363 | break; |
| 364 | case 4: |
| 365 | __get_user_size(*(u32 *)to, from, 4, ret); |
| 366 | break; |
| 367 | case 8: |
| 368 | __get_user_size(*(u64 *)to, from, 8, ret); |
| 369 | break; |
| 370 | } |
Stephen Rothwell | 48fe487 | 2005-11-01 15:53:19 +1100 | [diff] [blame] | 371 | if (ret == 0) |
| 372 | return 0; |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 373 | } |
Stephen Rothwell | 48fe487 | 2005-11-01 15:53:19 +1100 | [diff] [blame] | 374 | return __copy_tofrom_user((__force void __user *)to, from, n); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 375 | } |
| 376 | |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 377 | static inline unsigned long __copy_to_user_inatomic(void __user *to, |
| 378 | const void *from, unsigned long n) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 379 | { |
| 380 | if (__builtin_constant_p(n) && (n <= 8)) { |
| 381 | unsigned long ret; |
| 382 | |
| 383 | switch (n) { |
| 384 | case 1: |
| 385 | __put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret); |
| 386 | break; |
| 387 | case 2: |
| 388 | __put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret); |
| 389 | break; |
| 390 | case 4: |
| 391 | __put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret); |
| 392 | break; |
| 393 | case 8: |
| 394 | __put_user_size(*(u64 *)from, (u64 __user *)to, 8, ret); |
| 395 | break; |
| 396 | } |
Stephen Rothwell | 48fe487 | 2005-11-01 15:53:19 +1100 | [diff] [blame] | 397 | if (ret == 0) |
| 398 | return 0; |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 399 | } |
Stephen Rothwell | 48fe487 | 2005-11-01 15:53:19 +1100 | [diff] [blame] | 400 | return __copy_tofrom_user(to, (__force const void __user *)from, n); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 401 | } |
| 402 | |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 403 | static inline unsigned long __copy_from_user(void *to, |
| 404 | const void __user *from, unsigned long size) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 405 | { |
| 406 | might_sleep(); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 407 | return __copy_from_user_inatomic(to, from, size); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 408 | } |
| 409 | |
Stephen Rothwell | 5015b49 | 2005-10-31 18:39:20 +1100 | [diff] [blame] | 410 | static inline unsigned long __copy_to_user(void __user *to, |
| 411 | const void *from, unsigned long size) |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 412 | { |
| 413 | might_sleep(); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 414 | return __copy_to_user_inatomic(to, from, size); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 415 | } |
| 416 | |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 417 | extern unsigned long __clear_user(void __user *addr, unsigned long size); |
| 418 | |
| 419 | static inline unsigned long clear_user(void __user *addr, unsigned long size) |
| 420 | { |
| 421 | might_sleep(); |
| 422 | if (likely(access_ok(VERIFY_WRITE, addr, size))) |
| 423 | return __clear_user(addr, size); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 424 | if ((unsigned long)addr < TASK_SIZE) { |
| 425 | unsigned long over = (unsigned long)addr + size - TASK_SIZE; |
| 426 | return __clear_user(addr, size - over) + over; |
| 427 | } |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 428 | return size; |
| 429 | } |
| 430 | |
| 431 | extern int __strncpy_from_user(char *dst, const char __user *src, long count); |
| 432 | |
| 433 | static inline long strncpy_from_user(char *dst, const char __user *src, |
| 434 | long count) |
| 435 | { |
| 436 | might_sleep(); |
| 437 | if (likely(access_ok(VERIFY_READ, src, 1))) |
| 438 | return __strncpy_from_user(dst, src, count); |
| 439 | return -EFAULT; |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * Return the size of a string (including the ending 0) |
| 444 | * |
| 445 | * Return 0 for error |
| 446 | */ |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 447 | extern int __strnlen_user(const char __user *str, long len, unsigned long top); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 448 | |
| 449 | /* |
| 450 | * Returns the length of the string at str (including the null byte), |
| 451 | * or 0 if we hit a page we can't access, |
| 452 | * or something > len if we didn't find a null byte. |
| 453 | * |
| 454 | * The `top' parameter to __strnlen_user is to make sure that |
| 455 | * we can never overflow from the user area into kernel space. |
| 456 | */ |
| 457 | static inline int strnlen_user(const char __user *str, long len) |
| 458 | { |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 459 | unsigned long top = current->thread.fs.seg; |
| 460 | |
| 461 | if ((unsigned long)str > top) |
| 462 | return 0; |
| 463 | return __strnlen_user(str, len, top); |
Stephen Rothwell | 2df5e8b | 2005-10-29 17:51:31 +1000 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | #define strlen_user(str) strnlen_user((str), 0x7ffffffe) |
| 467 | |
| 468 | #endif /* __ASSEMBLY__ */ |
| 469 | #endif /* __KERNEL__ */ |
| 470 | |
| 471 | #endif /* _ARCH_POWERPC_UACCESS_H */ |