Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle |
| 7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
Maciej W. Rozycki | 619b6e1 | 2007-10-23 12:43:25 +0100 | [diff] [blame] | 8 | * Copyright (C) 2007 Maciej W. Rozycki |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 9 | * Copyright (C) 2014, Imagination Technologies Ltd. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | #ifndef _ASM_UACCESS_H |
| 12 | #define _ASM_UACCESS_H |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/thread_info.h> |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 17 | #include <asm/asm-eva.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | /* |
| 20 | * The fs value determines whether argument validity checking should be |
| 21 | * performed or not. If get_fs() == USER_DS, checking is performed, with |
| 22 | * get_fs() == KERNEL_DS, checking is bypassed. |
| 23 | * |
| 24 | * For historical reasons, these macros are grossly misnamed. |
| 25 | */ |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 26 | #ifdef CONFIG_32BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Sanjay Lal | 9843b03 | 2012-11-21 18:34:03 -0800 | [diff] [blame] | 28 | #ifdef CONFIG_KVM_GUEST |
| 29 | #define __UA_LIMIT 0x40000000UL |
| 30 | #else |
| 31 | #define __UA_LIMIT 0x80000000UL |
| 32 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #define __UA_ADDR ".word" |
| 35 | #define __UA_LA "la" |
| 36 | #define __UA_ADDU "addu" |
| 37 | #define __UA_t0 "$8" |
| 38 | #define __UA_t1 "$9" |
| 39 | |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 40 | #endif /* CONFIG_32BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 42 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
David Daney | 949e51b | 2010-10-14 11:32:33 -0700 | [diff] [blame] | 44 | extern u64 __ua_limit; |
| 45 | |
| 46 | #define __UA_LIMIT __ua_limit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #define __UA_ADDR ".dword" |
| 49 | #define __UA_LA "dla" |
| 50 | #define __UA_ADDU "daddu" |
| 51 | #define __UA_t0 "$12" |
| 52 | #define __UA_t1 "$13" |
| 53 | |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 54 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | /* |
| 57 | * USER_DS is a bitmask that has the bits set that may not be set in a valid |
| 58 | * userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but |
| 59 | * the arithmetic we're doing only works if the limit is a power of two, so |
| 60 | * we use 0x80000000 here on 32-bit kernels. If a process passes an invalid |
| 61 | * address in this range it's the process's problem, not ours :-) |
| 62 | */ |
| 63 | |
Sanjay Lal | 9843b03 | 2012-11-21 18:34:03 -0800 | [diff] [blame] | 64 | #ifdef CONFIG_KVM_GUEST |
| 65 | #define KERNEL_DS ((mm_segment_t) { 0x80000000UL }) |
| 66 | #define USER_DS ((mm_segment_t) { 0xC0000000UL }) |
| 67 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #define KERNEL_DS ((mm_segment_t) { 0UL }) |
| 69 | #define USER_DS ((mm_segment_t) { __UA_LIMIT }) |
Sanjay Lal | 9843b03 | 2012-11-21 18:34:03 -0800 | [diff] [blame] | 70 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | #define VERIFY_READ 0 |
| 73 | #define VERIFY_WRITE 1 |
| 74 | |
| 75 | #define get_ds() (KERNEL_DS) |
| 76 | #define get_fs() (current_thread_info()->addr_limit) |
| 77 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) |
| 78 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 79 | #define segment_eq(a, b) ((a).seg == (b).seg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | |
| 82 | /* |
| 83 | * Is a address valid? This does a straighforward calculation rather |
| 84 | * than tests. |
| 85 | * |
| 86 | * Address valid if: |
| 87 | * - "addr" doesn't have any high-bits set |
| 88 | * - AND "size" doesn't have any high-bits set |
| 89 | * - AND "addr+size" doesn't have any high-bits set |
| 90 | * - OR we are in kernel mode. |
| 91 | * |
| 92 | * __ua_size() is a trick to avoid runtime checking of positive constant |
| 93 | * sizes; for those we already know at compile time that the size is ok. |
| 94 | */ |
| 95 | #define __ua_size(size) \ |
| 96 | ((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size)) |
| 97 | |
| 98 | /* |
| 99 | * access_ok: - Checks if a user space pointer is valid |
| 100 | * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 101 | * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe |
| 102 | * to write to a block, it is always safe to read from it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | * @addr: User space pointer to start of block to check |
| 104 | * @size: Size of block to check |
| 105 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 106 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | * |
| 108 | * Checks if a pointer to a block of memory in user space is valid. |
| 109 | * |
| 110 | * Returns true (nonzero) if the memory block may be valid, false (zero) |
| 111 | * if it is definitely invalid. |
| 112 | * |
| 113 | * Note that, depending on architecture, this function probably just |
| 114 | * checks that the pointer is in the user space range - after calling |
| 115 | * this function, memory access functions may still return -EFAULT. |
| 116 | */ |
| 117 | |
| 118 | #define __access_mask get_fs().seg |
| 119 | |
Ralf Baechle | ed01b3d | 2009-04-27 16:46:21 +0200 | [diff] [blame] | 120 | #define __access_ok(addr, size, mask) \ |
| 121 | ({ \ |
| 122 | unsigned long __addr = (unsigned long) (addr); \ |
| 123 | unsigned long __size = size; \ |
| 124 | unsigned long __mask = mask; \ |
| 125 | unsigned long __ok; \ |
| 126 | \ |
| 127 | __chk_user_ptr(addr); \ |
| 128 | __ok = (signed long)(__mask & (__addr | (__addr + __size) | \ |
| 129 | __ua_size(__size))); \ |
| 130 | __ok == 0; \ |
Ralf Baechle | d0aab92 | 2009-04-27 15:31:34 +0200 | [diff] [blame] | 131 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
| 133 | #define access_ok(type, addr, size) \ |
Ralf Baechle | d0aab92 | 2009-04-27 15:31:34 +0200 | [diff] [blame] | 134 | likely(__access_ok((addr), (size), __access_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
| 136 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | * put_user: - Write a simple value into user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 138 | * @x: Value to copy to user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | * @ptr: Destination address, in user space. |
| 140 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 141 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | * |
| 143 | * This macro copies a single simple value from kernel space to user |
| 144 | * space. It supports simple types like char and int, but not larger |
| 145 | * data types like structures or arrays. |
| 146 | * |
| 147 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable |
| 148 | * to the result of dereferencing @ptr. |
| 149 | * |
| 150 | * Returns zero on success, or -EFAULT on error. |
| 151 | */ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 152 | #define put_user(x,ptr) \ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 153 | __put_user_check((x), (ptr), sizeof(*(ptr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | /* |
| 156 | * get_user: - Get a simple variable from user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 157 | * @x: Variable to store result. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | * @ptr: Source address, in user space. |
| 159 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 160 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | * |
| 162 | * This macro copies a single simple variable from user space to kernel |
| 163 | * space. It supports simple types like char and int, but not larger |
| 164 | * data types like structures or arrays. |
| 165 | * |
| 166 | * @ptr must have pointer-to-simple-variable type, and the result of |
| 167 | * dereferencing @ptr must be assignable to @x without a cast. |
| 168 | * |
| 169 | * Returns zero on success, or -EFAULT on error. |
| 170 | * On error, the variable @x is set to zero. |
| 171 | */ |
| 172 | #define get_user(x,ptr) \ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 173 | __get_user_check((x), (ptr), sizeof(*(ptr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
| 175 | /* |
| 176 | * __put_user: - Write a simple value into user space, with less checking. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 177 | * @x: Value to copy to user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | * @ptr: Destination address, in user space. |
| 179 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 180 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | * |
| 182 | * This macro copies a single simple value from kernel space to user |
| 183 | * space. It supports simple types like char and int, but not larger |
| 184 | * data types like structures or arrays. |
| 185 | * |
| 186 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable |
| 187 | * to the result of dereferencing @ptr. |
| 188 | * |
| 189 | * Caller must check the pointer with access_ok() before calling this |
| 190 | * function. |
| 191 | * |
| 192 | * Returns zero on success, or -EFAULT on error. |
| 193 | */ |
| 194 | #define __put_user(x,ptr) \ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 195 | __put_user_nocheck((x), (ptr), sizeof(*(ptr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | /* |
| 198 | * __get_user: - Get a simple variable from user space, with less checking. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 199 | * @x: Variable to store result. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | * @ptr: Source address, in user space. |
| 201 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 202 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | * |
| 204 | * This macro copies a single simple variable from user space to kernel |
| 205 | * space. It supports simple types like char and int, but not larger |
| 206 | * data types like structures or arrays. |
| 207 | * |
| 208 | * @ptr must have pointer-to-simple-variable type, and the result of |
| 209 | * dereferencing @ptr must be assignable to @x without a cast. |
| 210 | * |
| 211 | * Caller must check the pointer with access_ok() before calling this |
| 212 | * function. |
| 213 | * |
| 214 | * Returns zero on success, or -EFAULT on error. |
| 215 | * On error, the variable @x is set to zero. |
| 216 | */ |
| 217 | #define __get_user(x,ptr) \ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 218 | __get_user_nocheck((x), (ptr), sizeof(*(ptr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | struct __large_struct { unsigned long buf[100]; }; |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 221 | #define __m(x) (*(struct __large_struct __user *)(x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* |
| 224 | * Yuck. We need two variants, one for 64bit operation and one |
| 225 | * for 32 bit mode and old iron. |
| 226 | */ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 227 | #ifndef CONFIG_EVA |
| 228 | #define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr) |
| 229 | #else |
| 230 | /* |
| 231 | * Kernel specific functions for EVA. We need to use normal load instructions |
| 232 | * to read data from kernel when operating in EVA mode. We use these macros to |
| 233 | * avoid redefining __get_user_asm for EVA. |
| 234 | */ |
| 235 | #undef _loadd |
| 236 | #undef _loadw |
| 237 | #undef _loadh |
| 238 | #undef _loadb |
| 239 | #ifdef CONFIG_32BIT |
| 240 | #define _loadd _loadw |
| 241 | #else |
| 242 | #define _loadd(reg, addr) "ld " reg ", " addr |
| 243 | #endif |
| 244 | #define _loadw(reg, addr) "lw " reg ", " addr |
| 245 | #define _loadh(reg, addr) "lh " reg ", " addr |
| 246 | #define _loadb(reg, addr) "lb " reg ", " addr |
| 247 | |
| 248 | #define __get_kernel_common(val, size, ptr) \ |
| 249 | do { \ |
| 250 | switch (size) { \ |
| 251 | case 1: __get_user_asm(val, _loadb, ptr); break; \ |
| 252 | case 2: __get_user_asm(val, _loadh, ptr); break; \ |
| 253 | case 4: __get_user_asm(val, _loadw, ptr); break; \ |
| 254 | case 8: __GET_USER_DW(val, _loadd, ptr); break; \ |
| 255 | default: __get_user_unknown(); break; \ |
| 256 | } \ |
| 257 | } while (0) |
| 258 | #endif |
| 259 | |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 260 | #ifdef CONFIG_32BIT |
Markos Chandras | d84869a | 2013-12-17 13:15:40 +0000 | [diff] [blame] | 261 | #define __GET_USER_DW(val, insn, ptr) __get_user_asm_ll32(val, insn, ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | #endif |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 263 | #ifdef CONFIG_64BIT |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 264 | #define __GET_USER_DW(val, insn, ptr) __get_user_asm(val, insn, ptr) |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 265 | #endif |
| 266 | |
| 267 | extern void __get_user_unknown(void); |
| 268 | |
| 269 | #define __get_user_common(val, size, ptr) \ |
| 270 | do { \ |
| 271 | switch (size) { \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 272 | case 1: __get_user_asm(val, user_lb, ptr); break; \ |
| 273 | case 2: __get_user_asm(val, user_lh, ptr); break; \ |
| 274 | case 4: __get_user_asm(val, user_lw, ptr); break; \ |
| 275 | case 8: __GET_USER_DW(val, user_ld, ptr); break; \ |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 276 | default: __get_user_unknown(); break; \ |
| 277 | } \ |
| 278 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 280 | #define __get_user_nocheck(x, ptr, size) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | ({ \ |
Ralf Baechle | 8d2d91e | 2008-10-11 16:18:50 +0100 | [diff] [blame] | 282 | int __gu_err; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 284 | if (segment_eq(get_fs(), get_ds())) { \ |
| 285 | __get_kernel_common((x), size, ptr); \ |
| 286 | } else { \ |
| 287 | __chk_user_ptr(ptr); \ |
| 288 | __get_user_common((x), size, ptr); \ |
| 289 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | __gu_err; \ |
| 291 | }) |
| 292 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 293 | #define __get_user_check(x, ptr, size) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | ({ \ |
Ralf Baechle | 8d2d91e | 2008-10-11 16:18:50 +0100 | [diff] [blame] | 295 | int __gu_err = -EFAULT; \ |
Atsushi Nemoto | 8ecbbca | 2006-02-14 15:57:50 +0900 | [diff] [blame] | 296 | const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 298 | might_fault(); \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 299 | if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) { \ |
| 300 | if (segment_eq(get_fs(), get_ds())) \ |
| 301 | __get_kernel_common((x), size, __gu_ptr); \ |
| 302 | else \ |
| 303 | __get_user_common((x), size, __gu_ptr); \ |
| 304 | } \ |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 305 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | __gu_err; \ |
| 307 | }) |
| 308 | |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 309 | #define __get_user_asm(val, insn, addr) \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 310 | { \ |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 311 | long __gu_tmp; \ |
| 312 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | __asm__ __volatile__( \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 314 | "1: "insn("%1", "%3")" \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | "2: \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 316 | " .insn \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | " .section .fixup,\"ax\" \n" \ |
| 318 | "3: li %0, %4 \n" \ |
| 319 | " j 2b \n" \ |
| 320 | " .previous \n" \ |
| 321 | " .section __ex_table,\"a\" \n" \ |
| 322 | " "__UA_ADDR "\t1b, 3b \n" \ |
| 323 | " .previous \n" \ |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 324 | : "=r" (__gu_err), "=r" (__gu_tmp) \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 325 | : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \ |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 326 | \ |
Atsushi Nemoto | 8ecbbca | 2006-02-14 15:57:50 +0900 | [diff] [blame] | 327 | (val) = (__typeof__(*(addr))) __gu_tmp; \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 328 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | /* |
| 331 | * Get a long long 64 using 32 bit registers. |
| 332 | */ |
Markos Chandras | d84869a | 2013-12-17 13:15:40 +0000 | [diff] [blame] | 333 | #define __get_user_asm_ll32(val, insn, addr) \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 334 | { \ |
Ralf Baechle | cb66fb3 | 2007-02-13 11:45:24 +0000 | [diff] [blame] | 335 | union { \ |
| 336 | unsigned long long l; \ |
| 337 | __typeof__(*(addr)) t; \ |
| 338 | } __gu_tmp; \ |
Ralf Baechle | cd1fb9e | 2007-02-12 23:12:38 +0000 | [diff] [blame] | 339 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | __asm__ __volatile__( \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 341 | "1: " insn("%1", "(%3)")" \n" \ |
| 342 | "2: " insn("%D1", "4(%3)")" \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 343 | "3: \n" \ |
| 344 | " .insn \n" \ |
| 345 | " .section .fixup,\"ax\" \n" \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 346 | "4: li %0, %4 \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | " move %1, $0 \n" \ |
| 348 | " move %D1, $0 \n" \ |
| 349 | " j 3b \n" \ |
| 350 | " .previous \n" \ |
| 351 | " .section __ex_table,\"a\" \n" \ |
| 352 | " " __UA_ADDR " 1b, 4b \n" \ |
| 353 | " " __UA_ADDR " 2b, 4b \n" \ |
| 354 | " .previous \n" \ |
Ralf Baechle | cb66fb3 | 2007-02-13 11:45:24 +0000 | [diff] [blame] | 355 | : "=r" (__gu_err), "=&r" (__gu_tmp.l) \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 356 | : "0" (0), "r" (addr), "i" (-EFAULT)); \ |
Ralf Baechle | cb66fb3 | 2007-02-13 11:45:24 +0000 | [diff] [blame] | 357 | \ |
| 358 | (val) = __gu_tmp.t; \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 359 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 361 | #ifndef CONFIG_EVA |
| 362 | #define __put_kernel_common(ptr, size) __put_user_common(ptr, size) |
| 363 | #else |
| 364 | /* |
| 365 | * Kernel specific functions for EVA. We need to use normal load instructions |
| 366 | * to read data from kernel when operating in EVA mode. We use these macros to |
| 367 | * avoid redefining __get_user_asm for EVA. |
| 368 | */ |
| 369 | #undef _stored |
| 370 | #undef _storew |
| 371 | #undef _storeh |
| 372 | #undef _storeb |
| 373 | #ifdef CONFIG_32BIT |
| 374 | #define _stored _storew |
| 375 | #else |
| 376 | #define _stored(reg, addr) "ld " reg ", " addr |
| 377 | #endif |
| 378 | |
| 379 | #define _storew(reg, addr) "sw " reg ", " addr |
| 380 | #define _storeh(reg, addr) "sh " reg ", " addr |
| 381 | #define _storeb(reg, addr) "sb " reg ", " addr |
| 382 | |
| 383 | #define __put_kernel_common(ptr, size) \ |
| 384 | do { \ |
| 385 | switch (size) { \ |
| 386 | case 1: __put_user_asm(_storeb, ptr); break; \ |
| 387 | case 2: __put_user_asm(_storeh, ptr); break; \ |
| 388 | case 4: __put_user_asm(_storew, ptr); break; \ |
| 389 | case 8: __PUT_USER_DW(_stored, ptr); break; \ |
| 390 | default: __put_user_unknown(); break; \ |
| 391 | } \ |
| 392 | } while(0) |
| 393 | #endif |
| 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | /* |
| 396 | * Yuck. We need two variants, one for 64bit operation and one |
| 397 | * for 32 bit mode and old iron. |
| 398 | */ |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 399 | #ifdef CONFIG_32BIT |
Markos Chandras | d84869a | 2013-12-17 13:15:40 +0000 | [diff] [blame] | 400 | #define __PUT_USER_DW(insn, ptr) __put_user_asm_ll32(insn, ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | #endif |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 402 | #ifdef CONFIG_64BIT |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 403 | #define __PUT_USER_DW(insn, ptr) __put_user_asm(insn, ptr) |
Ralf Baechle | 4feb8f8 | 2006-01-23 16:15:30 +0000 | [diff] [blame] | 404 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Markos Chandras | ec56b1d | 2013-12-17 14:42:23 +0000 | [diff] [blame] | 406 | #define __put_user_common(ptr, size) \ |
| 407 | do { \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | switch (size) { \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 409 | case 1: __put_user_asm(user_sb, ptr); break; \ |
| 410 | case 2: __put_user_asm(user_sh, ptr); break; \ |
| 411 | case 4: __put_user_asm(user_sw, ptr); break; \ |
| 412 | case 8: __PUT_USER_DW(user_sd, ptr); break; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | default: __put_user_unknown(); break; \ |
| 414 | } \ |
Markos Chandras | ec56b1d | 2013-12-17 14:42:23 +0000 | [diff] [blame] | 415 | } while (0) |
| 416 | |
| 417 | #define __put_user_nocheck(x, ptr, size) \ |
| 418 | ({ \ |
| 419 | __typeof__(*(ptr)) __pu_val; \ |
| 420 | int __pu_err = 0; \ |
| 421 | \ |
Markos Chandras | ec56b1d | 2013-12-17 14:42:23 +0000 | [diff] [blame] | 422 | __pu_val = (x); \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 423 | if (segment_eq(get_fs(), get_ds())) { \ |
| 424 | __put_kernel_common(ptr, size); \ |
| 425 | } else { \ |
| 426 | __chk_user_ptr(ptr); \ |
| 427 | __put_user_common(ptr, size); \ |
| 428 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | __pu_err; \ |
| 430 | }) |
| 431 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 432 | #define __put_user_check(x, ptr, size) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | ({ \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 434 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
| 435 | __typeof__(*(ptr)) __pu_val = (x); \ |
Ralf Baechle | 8d2d91e | 2008-10-11 16:18:50 +0100 | [diff] [blame] | 436 | int __pu_err = -EFAULT; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 438 | might_fault(); \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 439 | if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \ |
| 440 | if (segment_eq(get_fs(), get_ds())) \ |
| 441 | __put_kernel_common(__pu_addr, size); \ |
| 442 | else \ |
| 443 | __put_user_common(__pu_addr, size); \ |
| 444 | } \ |
Markos Chandras | ec56b1d | 2013-12-17 14:42:23 +0000 | [diff] [blame] | 445 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | __pu_err; \ |
| 447 | }) |
| 448 | |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 449 | #define __put_user_asm(insn, ptr) \ |
| 450 | { \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | __asm__ __volatile__( \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 452 | "1: "insn("%z2", "%3")" # __put_user_asm \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | "2: \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 454 | " .insn \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | " .section .fixup,\"ax\" \n" \ |
| 456 | "3: li %0, %4 \n" \ |
| 457 | " j 2b \n" \ |
| 458 | " .previous \n" \ |
| 459 | " .section __ex_table,\"a\" \n" \ |
| 460 | " " __UA_ADDR " 1b, 3b \n" \ |
| 461 | " .previous \n" \ |
| 462 | : "=r" (__pu_err) \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 463 | : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | "i" (-EFAULT)); \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 465 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Markos Chandras | d84869a | 2013-12-17 13:15:40 +0000 | [diff] [blame] | 467 | #define __put_user_asm_ll32(insn, ptr) \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 468 | { \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | __asm__ __volatile__( \ |
Markos Chandras | ac1d859 | 2013-12-11 11:25:33 +0000 | [diff] [blame^] | 470 | "1: "insn("%2", "(%3)")" # __put_user_asm_ll32 \n" \ |
| 471 | "2: "insn("%D2", "4(%3)")" \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | "3: \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 473 | " .insn \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | " .section .fixup,\"ax\" \n" \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 475 | "4: li %0, %4 \n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | " j 3b \n" \ |
| 477 | " .previous \n" \ |
| 478 | " .section __ex_table,\"a\" \n" \ |
| 479 | " " __UA_ADDR " 1b, 4b \n" \ |
| 480 | " " __UA_ADDR " 2b, 4b \n" \ |
| 481 | " .previous" \ |
| 482 | : "=r" (__pu_err) \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 483 | : "0" (0), "r" (__pu_val), "r" (ptr), \ |
| 484 | "i" (-EFAULT)); \ |
| 485 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
| 487 | extern void __put_user_unknown(void); |
| 488 | |
| 489 | /* |
Leonid Yegoshin | 18e9001 | 2013-12-17 15:20:24 +0000 | [diff] [blame] | 490 | * ul{b,h,w} are macros and there are no equivalent macros for EVA. |
| 491 | * EVA unaligned access is handled in the ADE exception handler. |
| 492 | */ |
| 493 | #ifndef CONFIG_EVA |
| 494 | /* |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 495 | * put_user_unaligned: - Write a simple value into user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 496 | * @x: Value to copy to user space. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 497 | * @ptr: Destination address, in user space. |
| 498 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 499 | * Context: User context only. This function may sleep. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 500 | * |
| 501 | * This macro copies a single simple value from kernel space to user |
| 502 | * space. It supports simple types like char and int, but not larger |
| 503 | * data types like structures or arrays. |
| 504 | * |
| 505 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable |
| 506 | * to the result of dereferencing @ptr. |
| 507 | * |
| 508 | * Returns zero on success, or -EFAULT on error. |
| 509 | */ |
| 510 | #define put_user_unaligned(x,ptr) \ |
| 511 | __put_user_unaligned_check((x),(ptr),sizeof(*(ptr))) |
| 512 | |
| 513 | /* |
| 514 | * get_user_unaligned: - Get a simple variable from user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 515 | * @x: Variable to store result. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 516 | * @ptr: Source address, in user space. |
| 517 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 518 | * Context: User context only. This function may sleep. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 519 | * |
| 520 | * This macro copies a single simple variable from user space to kernel |
| 521 | * space. It supports simple types like char and int, but not larger |
| 522 | * data types like structures or arrays. |
| 523 | * |
| 524 | * @ptr must have pointer-to-simple-variable type, and the result of |
| 525 | * dereferencing @ptr must be assignable to @x without a cast. |
| 526 | * |
| 527 | * Returns zero on success, or -EFAULT on error. |
| 528 | * On error, the variable @x is set to zero. |
| 529 | */ |
| 530 | #define get_user_unaligned(x,ptr) \ |
| 531 | __get_user_unaligned_check((x),(ptr),sizeof(*(ptr))) |
| 532 | |
| 533 | /* |
| 534 | * __put_user_unaligned: - Write a simple value into user space, with less checking. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 535 | * @x: Value to copy to user space. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 536 | * @ptr: Destination address, in user space. |
| 537 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 538 | * Context: User context only. This function may sleep. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 539 | * |
| 540 | * This macro copies a single simple value from kernel space to user |
| 541 | * space. It supports simple types like char and int, but not larger |
| 542 | * data types like structures or arrays. |
| 543 | * |
| 544 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable |
| 545 | * to the result of dereferencing @ptr. |
| 546 | * |
| 547 | * Caller must check the pointer with access_ok() before calling this |
| 548 | * function. |
| 549 | * |
| 550 | * Returns zero on success, or -EFAULT on error. |
| 551 | */ |
| 552 | #define __put_user_unaligned(x,ptr) \ |
| 553 | __put_user_unaligned_nocheck((x),(ptr),sizeof(*(ptr))) |
| 554 | |
| 555 | /* |
| 556 | * __get_user_unaligned: - Get a simple variable from user space, with less checking. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 557 | * @x: Variable to store result. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 558 | * @ptr: Source address, in user space. |
| 559 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 560 | * Context: User context only. This function may sleep. |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 561 | * |
| 562 | * This macro copies a single simple variable from user space to kernel |
| 563 | * space. It supports simple types like char and int, but not larger |
| 564 | * data types like structures or arrays. |
| 565 | * |
| 566 | * @ptr must have pointer-to-simple-variable type, and the result of |
| 567 | * dereferencing @ptr must be assignable to @x without a cast. |
| 568 | * |
| 569 | * Caller must check the pointer with access_ok() before calling this |
| 570 | * function. |
| 571 | * |
| 572 | * Returns zero on success, or -EFAULT on error. |
| 573 | * On error, the variable @x is set to zero. |
| 574 | */ |
| 575 | #define __get_user_unaligned(x,ptr) \ |
| 576 | __get_user__unalignednocheck((x),(ptr),sizeof(*(ptr))) |
| 577 | |
| 578 | /* |
| 579 | * Yuck. We need two variants, one for 64bit operation and one |
| 580 | * for 32 bit mode and old iron. |
| 581 | */ |
| 582 | #ifdef CONFIG_32BIT |
| 583 | #define __GET_USER_UNALIGNED_DW(val, ptr) \ |
| 584 | __get_user_unaligned_asm_ll32(val, ptr) |
| 585 | #endif |
| 586 | #ifdef CONFIG_64BIT |
| 587 | #define __GET_USER_UNALIGNED_DW(val, ptr) \ |
| 588 | __get_user_unaligned_asm(val, "uld", ptr) |
| 589 | #endif |
| 590 | |
| 591 | extern void __get_user_unaligned_unknown(void); |
| 592 | |
| 593 | #define __get_user_unaligned_common(val, size, ptr) \ |
| 594 | do { \ |
| 595 | switch (size) { \ |
| 596 | case 1: __get_user_asm(val, "lb", ptr); break; \ |
| 597 | case 2: __get_user_unaligned_asm(val, "ulh", ptr); break; \ |
| 598 | case 4: __get_user_unaligned_asm(val, "ulw", ptr); break; \ |
| 599 | case 8: __GET_USER_UNALIGNED_DW(val, ptr); break; \ |
| 600 | default: __get_user_unaligned_unknown(); break; \ |
| 601 | } \ |
| 602 | } while (0) |
| 603 | |
| 604 | #define __get_user_unaligned_nocheck(x,ptr,size) \ |
| 605 | ({ \ |
| 606 | int __gu_err; \ |
| 607 | \ |
| 608 | __get_user_unaligned_common((x), size, ptr); \ |
| 609 | __gu_err; \ |
| 610 | }) |
| 611 | |
| 612 | #define __get_user_unaligned_check(x,ptr,size) \ |
| 613 | ({ \ |
| 614 | int __gu_err = -EFAULT; \ |
| 615 | const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \ |
| 616 | \ |
| 617 | if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \ |
| 618 | __get_user_unaligned_common((x), size, __gu_ptr); \ |
| 619 | \ |
| 620 | __gu_err; \ |
| 621 | }) |
| 622 | |
| 623 | #define __get_user_unaligned_asm(val, insn, addr) \ |
| 624 | { \ |
| 625 | long __gu_tmp; \ |
| 626 | \ |
| 627 | __asm__ __volatile__( \ |
| 628 | "1: " insn " %1, %3 \n" \ |
| 629 | "2: \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 630 | " .insn \n" \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 631 | " .section .fixup,\"ax\" \n" \ |
| 632 | "3: li %0, %4 \n" \ |
| 633 | " j 2b \n" \ |
| 634 | " .previous \n" \ |
| 635 | " .section __ex_table,\"a\" \n" \ |
| 636 | " "__UA_ADDR "\t1b, 3b \n" \ |
| 637 | " "__UA_ADDR "\t1b + 4, 3b \n" \ |
| 638 | " .previous \n" \ |
| 639 | : "=r" (__gu_err), "=r" (__gu_tmp) \ |
| 640 | : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \ |
| 641 | \ |
| 642 | (val) = (__typeof__(*(addr))) __gu_tmp; \ |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Get a long long 64 using 32 bit registers. |
| 647 | */ |
| 648 | #define __get_user_unaligned_asm_ll32(val, addr) \ |
| 649 | { \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 650 | unsigned long long __gu_tmp; \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 651 | \ |
| 652 | __asm__ __volatile__( \ |
| 653 | "1: ulw %1, (%3) \n" \ |
| 654 | "2: ulw %D1, 4(%3) \n" \ |
| 655 | " move %0, $0 \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 656 | "3: \n" \ |
| 657 | " .insn \n" \ |
| 658 | " .section .fixup,\"ax\" \n" \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 659 | "4: li %0, %4 \n" \ |
| 660 | " move %1, $0 \n" \ |
| 661 | " move %D1, $0 \n" \ |
| 662 | " j 3b \n" \ |
| 663 | " .previous \n" \ |
| 664 | " .section __ex_table,\"a\" \n" \ |
| 665 | " " __UA_ADDR " 1b, 4b \n" \ |
| 666 | " " __UA_ADDR " 1b + 4, 4b \n" \ |
| 667 | " " __UA_ADDR " 2b, 4b \n" \ |
| 668 | " " __UA_ADDR " 2b + 4, 4b \n" \ |
| 669 | " .previous \n" \ |
| 670 | : "=r" (__gu_err), "=&r" (__gu_tmp) \ |
| 671 | : "0" (0), "r" (addr), "i" (-EFAULT)); \ |
| 672 | (val) = (__typeof__(*(addr))) __gu_tmp; \ |
| 673 | } |
| 674 | |
| 675 | /* |
| 676 | * Yuck. We need two variants, one for 64bit operation and one |
| 677 | * for 32 bit mode and old iron. |
| 678 | */ |
| 679 | #ifdef CONFIG_32BIT |
| 680 | #define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm_ll32(ptr) |
| 681 | #endif |
| 682 | #ifdef CONFIG_64BIT |
| 683 | #define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm("usd", ptr) |
| 684 | #endif |
| 685 | |
Markos Chandras | ec56b1d | 2013-12-17 14:42:23 +0000 | [diff] [blame] | 686 | #define __put_user_unaligned_common(ptr, size) \ |
| 687 | do { \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 688 | switch (size) { \ |
| 689 | case 1: __put_user_asm("sb", ptr); break; \ |
| 690 | case 2: __put_user_unaligned_asm("ush", ptr); break; \ |
| 691 | case 4: __put_user_unaligned_asm("usw", ptr); break; \ |
| 692 | case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \ |
| 693 | default: __put_user_unaligned_unknown(); break; \ |
Markos Chandras | ec56b1d | 2013-12-17 14:42:23 +0000 | [diff] [blame] | 694 | } while (0) |
| 695 | |
| 696 | #define __put_user_unaligned_nocheck(x,ptr,size) \ |
| 697 | ({ \ |
| 698 | __typeof__(*(ptr)) __pu_val; \ |
| 699 | int __pu_err = 0; \ |
| 700 | \ |
| 701 | __pu_val = (x); \ |
| 702 | __put_user_unaligned_common(ptr, size); \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 703 | __pu_err; \ |
| 704 | }) |
| 705 | |
| 706 | #define __put_user_unaligned_check(x,ptr,size) \ |
| 707 | ({ \ |
| 708 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
| 709 | __typeof__(*(ptr)) __pu_val = (x); \ |
| 710 | int __pu_err = -EFAULT; \ |
| 711 | \ |
Markos Chandras | ec56b1d | 2013-12-17 14:42:23 +0000 | [diff] [blame] | 712 | if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \ |
| 713 | __put_user_unaligned_common(__pu_addr, size); \ |
| 714 | \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 715 | __pu_err; \ |
| 716 | }) |
| 717 | |
| 718 | #define __put_user_unaligned_asm(insn, ptr) \ |
| 719 | { \ |
| 720 | __asm__ __volatile__( \ |
| 721 | "1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \ |
| 722 | "2: \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 723 | " .insn \n" \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 724 | " .section .fixup,\"ax\" \n" \ |
| 725 | "3: li %0, %4 \n" \ |
| 726 | " j 2b \n" \ |
| 727 | " .previous \n" \ |
| 728 | " .section __ex_table,\"a\" \n" \ |
| 729 | " " __UA_ADDR " 1b, 3b \n" \ |
| 730 | " .previous \n" \ |
| 731 | : "=r" (__pu_err) \ |
| 732 | : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \ |
| 733 | "i" (-EFAULT)); \ |
| 734 | } |
| 735 | |
| 736 | #define __put_user_unaligned_asm_ll32(ptr) \ |
| 737 | { \ |
| 738 | __asm__ __volatile__( \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 739 | "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 740 | "2: sw %D2, 4(%3) \n" \ |
| 741 | "3: \n" \ |
Steven J. Hill | 1658f91 | 2013-03-25 13:22:59 -0500 | [diff] [blame] | 742 | " .insn \n" \ |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 743 | " .section .fixup,\"ax\" \n" \ |
| 744 | "4: li %0, %4 \n" \ |
| 745 | " j 3b \n" \ |
| 746 | " .previous \n" \ |
| 747 | " .section __ex_table,\"a\" \n" \ |
| 748 | " " __UA_ADDR " 1b, 4b \n" \ |
| 749 | " " __UA_ADDR " 1b + 4, 4b \n" \ |
| 750 | " " __UA_ADDR " 2b, 4b \n" \ |
| 751 | " " __UA_ADDR " 2b + 4, 4b \n" \ |
| 752 | " .previous" \ |
| 753 | : "=r" (__pu_err) \ |
| 754 | : "0" (0), "r" (__pu_val), "r" (ptr), \ |
| 755 | "i" (-EFAULT)); \ |
| 756 | } |
| 757 | |
| 758 | extern void __put_user_unaligned_unknown(void); |
Leonid Yegoshin | 18e9001 | 2013-12-17 15:20:24 +0000 | [diff] [blame] | 759 | #endif |
Ralf Baechle | 71ec6cc | 2006-10-31 02:52:56 +0000 | [diff] [blame] | 760 | |
| 761 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | * We're generating jump to subroutines which will be outside the range of |
| 763 | * jump instructions |
| 764 | */ |
| 765 | #ifdef MODULE |
| 766 | #define __MODULE_JAL(destination) \ |
| 767 | ".set\tnoat\n\t" \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 768 | __UA_LA "\t$1, " #destination "\n\t" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | "jalr\t$1\n\t" \ |
| 770 | ".set\tat\n\t" |
| 771 | #else |
| 772 | #define __MODULE_JAL(destination) \ |
| 773 | "jal\t" #destination "\n\t" |
| 774 | #endif |
| 775 | |
Maciej W. Rozycki | 619b6e1 | 2007-10-23 12:43:25 +0100 | [diff] [blame] | 776 | #ifndef CONFIG_CPU_DADDI_WORKAROUNDS |
| 777 | #define DADDI_SCRATCH "$0" |
| 778 | #else |
| 779 | #define DADDI_SCRATCH "$3" |
| 780 | #endif |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | extern size_t __copy_user(void *__to, const void *__from, size_t __n); |
| 783 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 784 | #define __invoke_copy_to_user(to, from, n) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | ({ \ |
Ralf Baechle | 49a89ef | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 786 | register void __user *__cu_to_r __asm__("$4"); \ |
| 787 | register const void *__cu_from_r __asm__("$5"); \ |
| 788 | register long __cu_len_r __asm__("$6"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | \ |
| 790 | __cu_to_r = (to); \ |
| 791 | __cu_from_r = (from); \ |
| 792 | __cu_len_r = (n); \ |
| 793 | __asm__ __volatile__( \ |
| 794 | __MODULE_JAL(__copy_user) \ |
| 795 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ |
| 796 | : \ |
David Daney | bb0757e | 2012-06-06 23:00:31 +0100 | [diff] [blame] | 797 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
Maciej W. Rozycki | 619b6e1 | 2007-10-23 12:43:25 +0100 | [diff] [blame] | 798 | DADDI_SCRATCH, "memory"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | __cu_len_r; \ |
| 800 | }) |
| 801 | |
| 802 | /* |
| 803 | * __copy_to_user: - Copy a block of data into user space, with less checking. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 804 | * @to: Destination address, in user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | * @from: Source address, in kernel space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 806 | * @n: Number of bytes to copy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 808 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | * |
| 810 | * Copy data from kernel space to user space. Caller must check |
| 811 | * the specified block with access_ok() before calling this function. |
| 812 | * |
| 813 | * Returns number of bytes that could not be copied. |
| 814 | * On success, this will be zero. |
| 815 | */ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 816 | #define __copy_to_user(to, from, n) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | ({ \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 818 | void __user *__cu_to; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | const void *__cu_from; \ |
| 820 | long __cu_len; \ |
| 821 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | __cu_to = (to); \ |
| 823 | __cu_from = (from); \ |
| 824 | __cu_len = (n); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 825 | might_fault(); \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 826 | __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | __cu_len; \ |
| 828 | }) |
| 829 | |
Ralf Baechle | d0c91ae | 2007-03-05 15:54:20 +0000 | [diff] [blame] | 830 | extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n); |
| 831 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 832 | #define __copy_to_user_inatomic(to, from, n) \ |
Ralf Baechle | e03b526 | 2007-02-19 16:59:24 +0000 | [diff] [blame] | 833 | ({ \ |
| 834 | void __user *__cu_to; \ |
| 835 | const void *__cu_from; \ |
| 836 | long __cu_len; \ |
| 837 | \ |
| 838 | __cu_to = (to); \ |
| 839 | __cu_from = (from); \ |
| 840 | __cu_len = (n); \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 841 | __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \ |
Ralf Baechle | e03b526 | 2007-02-19 16:59:24 +0000 | [diff] [blame] | 842 | __cu_len; \ |
| 843 | }) |
| 844 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 845 | #define __copy_from_user_inatomic(to, from, n) \ |
Ralf Baechle | e03b526 | 2007-02-19 16:59:24 +0000 | [diff] [blame] | 846 | ({ \ |
| 847 | void *__cu_to; \ |
| 848 | const void __user *__cu_from; \ |
| 849 | long __cu_len; \ |
| 850 | \ |
| 851 | __cu_to = (to); \ |
| 852 | __cu_from = (from); \ |
| 853 | __cu_len = (n); \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 854 | __cu_len = __invoke_copy_from_user_inatomic(__cu_to, __cu_from, \ |
| 855 | __cu_len); \ |
Ralf Baechle | e03b526 | 2007-02-19 16:59:24 +0000 | [diff] [blame] | 856 | __cu_len; \ |
| 857 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
| 859 | /* |
| 860 | * copy_to_user: - Copy a block of data into user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 861 | * @to: Destination address, in user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | * @from: Source address, in kernel space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 863 | * @n: Number of bytes to copy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 865 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | * |
| 867 | * Copy data from kernel space to user space. |
| 868 | * |
| 869 | * Returns number of bytes that could not be copied. |
| 870 | * On success, this will be zero. |
| 871 | */ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 872 | #define copy_to_user(to, from, n) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | ({ \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 874 | void __user *__cu_to; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | const void *__cu_from; \ |
| 876 | long __cu_len; \ |
| 877 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | __cu_to = (to); \ |
| 879 | __cu_from = (from); \ |
| 880 | __cu_len = (n); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 881 | if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \ |
| 882 | might_fault(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 884 | __cu_len); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 885 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | __cu_len; \ |
| 887 | }) |
| 888 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 889 | #define __invoke_copy_from_user(to, from, n) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | ({ \ |
Ralf Baechle | 49a89ef | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 891 | register void *__cu_to_r __asm__("$4"); \ |
| 892 | register const void __user *__cu_from_r __asm__("$5"); \ |
| 893 | register long __cu_len_r __asm__("$6"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | \ |
| 895 | __cu_to_r = (to); \ |
| 896 | __cu_from_r = (from); \ |
| 897 | __cu_len_r = (n); \ |
| 898 | __asm__ __volatile__( \ |
| 899 | ".set\tnoreorder\n\t" \ |
| 900 | __MODULE_JAL(__copy_user) \ |
| 901 | ".set\tnoat\n\t" \ |
| 902 | __UA_ADDU "\t$1, %1, %2\n\t" \ |
| 903 | ".set\tat\n\t" \ |
| 904 | ".set\treorder" \ |
| 905 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ |
| 906 | : \ |
David Daney | bb0757e | 2012-06-06 23:00:31 +0100 | [diff] [blame] | 907 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
Maciej W. Rozycki | 619b6e1 | 2007-10-23 12:43:25 +0100 | [diff] [blame] | 908 | DADDI_SCRATCH, "memory"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | __cu_len_r; \ |
| 910 | }) |
| 911 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 912 | #define __invoke_copy_from_user_inatomic(to, from, n) \ |
Ralf Baechle | e03b526 | 2007-02-19 16:59:24 +0000 | [diff] [blame] | 913 | ({ \ |
Ralf Baechle | 49a89ef | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 914 | register void *__cu_to_r __asm__("$4"); \ |
| 915 | register const void __user *__cu_from_r __asm__("$5"); \ |
| 916 | register long __cu_len_r __asm__("$6"); \ |
Ralf Baechle | e03b526 | 2007-02-19 16:59:24 +0000 | [diff] [blame] | 917 | \ |
| 918 | __cu_to_r = (to); \ |
| 919 | __cu_from_r = (from); \ |
| 920 | __cu_len_r = (n); \ |
| 921 | __asm__ __volatile__( \ |
| 922 | ".set\tnoreorder\n\t" \ |
| 923 | __MODULE_JAL(__copy_user_inatomic) \ |
| 924 | ".set\tnoat\n\t" \ |
| 925 | __UA_ADDU "\t$1, %1, %2\n\t" \ |
| 926 | ".set\tat\n\t" \ |
| 927 | ".set\treorder" \ |
| 928 | : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \ |
| 929 | : \ |
David Daney | bb0757e | 2012-06-06 23:00:31 +0100 | [diff] [blame] | 930 | : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \ |
Maciej W. Rozycki | 619b6e1 | 2007-10-23 12:43:25 +0100 | [diff] [blame] | 931 | DADDI_SCRATCH, "memory"); \ |
Ralf Baechle | e03b526 | 2007-02-19 16:59:24 +0000 | [diff] [blame] | 932 | __cu_len_r; \ |
| 933 | }) |
| 934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | /* |
Chris Dearman | 131c1a2 | 2007-02-01 19:54:13 +0000 | [diff] [blame] | 936 | * __copy_from_user: - Copy a block of data from user space, with less checking. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 937 | * @to: Destination address, in kernel space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | * @from: Source address, in user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 939 | * @n: Number of bytes to copy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 941 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | * |
| 943 | * Copy data from user space to kernel space. Caller must check |
| 944 | * the specified block with access_ok() before calling this function. |
| 945 | * |
| 946 | * Returns number of bytes that could not be copied. |
| 947 | * On success, this will be zero. |
| 948 | * |
| 949 | * If some data could not be copied, this function will pad the copied |
| 950 | * data to the requested size using zero bytes. |
| 951 | */ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 952 | #define __copy_from_user(to, from, n) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | ({ \ |
| 954 | void *__cu_to; \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 955 | const void __user *__cu_from; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | long __cu_len; \ |
| 957 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | __cu_to = (to); \ |
| 959 | __cu_from = (from); \ |
| 960 | __cu_len = (n); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 961 | might_fault(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 963 | __cu_len); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | __cu_len; \ |
| 965 | }) |
| 966 | |
| 967 | /* |
| 968 | * copy_from_user: - Copy a block of data from user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 969 | * @to: Destination address, in kernel space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | * @from: Source address, in user space. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 971 | * @n: Number of bytes to copy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 973 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | * |
| 975 | * Copy data from user space to kernel space. |
| 976 | * |
| 977 | * Returns number of bytes that could not be copied. |
| 978 | * On success, this will be zero. |
| 979 | * |
| 980 | * If some data could not be copied, this function will pad the copied |
| 981 | * data to the requested size using zero bytes. |
| 982 | */ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 983 | #define copy_from_user(to, from, n) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | ({ \ |
| 985 | void *__cu_to; \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 986 | const void __user *__cu_from; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | long __cu_len; \ |
| 988 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | __cu_to = (to); \ |
| 990 | __cu_from = (from); \ |
| 991 | __cu_len = (n); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 992 | if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \ |
| 993 | might_fault(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 995 | __cu_len); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 996 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | __cu_len; \ |
| 998 | }) |
| 999 | |
Ralf Baechle | ed01b3d | 2009-04-27 16:46:21 +0200 | [diff] [blame] | 1000 | #define __copy_in_user(to, from, n) \ |
| 1001 | ({ \ |
| 1002 | void __user *__cu_to; \ |
| 1003 | const void __user *__cu_from; \ |
| 1004 | long __cu_len; \ |
| 1005 | \ |
Ralf Baechle | ed01b3d | 2009-04-27 16:46:21 +0200 | [diff] [blame] | 1006 | __cu_to = (to); \ |
| 1007 | __cu_from = (from); \ |
| 1008 | __cu_len = (n); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1009 | might_fault(); \ |
Ralf Baechle | ed01b3d | 2009-04-27 16:46:21 +0200 | [diff] [blame] | 1010 | __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1011 | __cu_len); \ |
Ralf Baechle | ed01b3d | 2009-04-27 16:46:21 +0200 | [diff] [blame] | 1012 | __cu_len; \ |
| 1013 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 1015 | #define copy_in_user(to, from, n) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | ({ \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1017 | void __user *__cu_to; \ |
| 1018 | const void __user *__cu_from; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | long __cu_len; \ |
| 1020 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | __cu_to = (to); \ |
| 1022 | __cu_from = (from); \ |
| 1023 | __cu_len = (n); \ |
| 1024 | if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) && \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1025 | access_ok(VERIFY_WRITE, __cu_to, __cu_len))) { \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1026 | might_fault(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \ |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1028 | __cu_len); \ |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1029 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | __cu_len; \ |
| 1031 | }) |
| 1032 | |
| 1033 | /* |
| 1034 | * __clear_user: - Zero a block of memory in user space, with less checking. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1035 | * @to: Destination address, in user space. |
| 1036 | * @n: Number of bytes to zero. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | * |
| 1038 | * Zero a block of memory in user space. Caller must check |
| 1039 | * the specified block with access_ok() before calling this function. |
| 1040 | * |
| 1041 | * Returns number of bytes that could not be cleared. |
| 1042 | * On success, this will be zero. |
| 1043 | */ |
| 1044 | static inline __kernel_size_t |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1045 | __clear_user(void __user *addr, __kernel_size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | { |
| 1047 | __kernel_size_t res; |
| 1048 | |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1049 | might_fault(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | __asm__ __volatile__( |
| 1051 | "move\t$4, %1\n\t" |
| 1052 | "move\t$5, $0\n\t" |
| 1053 | "move\t$6, %2\n\t" |
| 1054 | __MODULE_JAL(__bzero) |
| 1055 | "move\t%0, $6" |
| 1056 | : "=r" (res) |
| 1057 | : "r" (addr), "r" (size) |
| 1058 | : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"); |
| 1059 | |
| 1060 | return res; |
| 1061 | } |
| 1062 | |
| 1063 | #define clear_user(addr,n) \ |
| 1064 | ({ \ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1065 | void __user * __cl_addr = (addr); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | unsigned long __cl_size = (n); \ |
| 1067 | if (__cl_size && access_ok(VERIFY_WRITE, \ |
Wu Zhangjin | 63d3892 | 2009-05-21 05:50:01 +0800 | [diff] [blame] | 1068 | __cl_addr, __cl_size)) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | __cl_size = __clear_user(__cl_addr, __cl_size); \ |
| 1070 | __cl_size; \ |
| 1071 | }) |
| 1072 | |
| 1073 | /* |
| 1074 | * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking. |
| 1075 | * @dst: Destination address, in kernel space. This buffer must be at |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1076 | * least @count bytes long. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | * @src: Source address, in user space. |
| 1078 | * @count: Maximum number of bytes to copy, including the trailing NUL. |
| 1079 | * |
| 1080 | * Copies a NUL-terminated string from userspace to kernel space. |
| 1081 | * Caller must check the specified block with access_ok() before calling |
| 1082 | * this function. |
| 1083 | * |
| 1084 | * On success, returns the length of the string (not including the trailing |
| 1085 | * NUL). |
| 1086 | * |
| 1087 | * If access to userspace fails, returns -EFAULT (some data may have been |
| 1088 | * copied). |
| 1089 | * |
| 1090 | * If @count is smaller than the length of the string, copies @count bytes |
| 1091 | * and returns @count. |
| 1092 | */ |
| 1093 | static inline long |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1094 | __strncpy_from_user(char *__to, const char __user *__from, long __len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | { |
| 1096 | long res; |
| 1097 | |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1098 | might_fault(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | __asm__ __volatile__( |
| 1100 | "move\t$4, %1\n\t" |
| 1101 | "move\t$5, %2\n\t" |
| 1102 | "move\t$6, %3\n\t" |
| 1103 | __MODULE_JAL(__strncpy_from_user_nocheck_asm) |
| 1104 | "move\t%0, $2" |
| 1105 | : "=r" (res) |
| 1106 | : "r" (__to), "r" (__from), "r" (__len) |
| 1107 | : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); |
| 1108 | |
| 1109 | return res; |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * strncpy_from_user: - Copy a NUL terminated string from userspace. |
| 1114 | * @dst: Destination address, in kernel space. This buffer must be at |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1115 | * least @count bytes long. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | * @src: Source address, in user space. |
| 1117 | * @count: Maximum number of bytes to copy, including the trailing NUL. |
| 1118 | * |
| 1119 | * Copies a NUL-terminated string from userspace to kernel space. |
| 1120 | * |
| 1121 | * On success, returns the length of the string (not including the trailing |
| 1122 | * NUL). |
| 1123 | * |
| 1124 | * If access to userspace fails, returns -EFAULT (some data may have been |
| 1125 | * copied). |
| 1126 | * |
| 1127 | * If @count is smaller than the length of the string, copies @count bytes |
| 1128 | * and returns @count. |
| 1129 | */ |
| 1130 | static inline long |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1131 | strncpy_from_user(char *__to, const char __user *__from, long __len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | { |
| 1133 | long res; |
| 1134 | |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1135 | might_fault(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | __asm__ __volatile__( |
| 1137 | "move\t$4, %1\n\t" |
| 1138 | "move\t$5, %2\n\t" |
| 1139 | "move\t$6, %3\n\t" |
| 1140 | __MODULE_JAL(__strncpy_from_user_asm) |
| 1141 | "move\t%0, $2" |
| 1142 | : "=r" (res) |
| 1143 | : "r" (__to), "r" (__from), "r" (__len) |
| 1144 | : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); |
| 1145 | |
| 1146 | return res; |
| 1147 | } |
| 1148 | |
| 1149 | /* Returns: 0 if bad, string length+1 (memory size) of string if ok */ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1150 | static inline long __strlen_user(const char __user *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | { |
| 1152 | long res; |
| 1153 | |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1154 | might_fault(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | __asm__ __volatile__( |
| 1156 | "move\t$4, %1\n\t" |
| 1157 | __MODULE_JAL(__strlen_user_nocheck_asm) |
| 1158 | "move\t%0, $2" |
| 1159 | : "=r" (res) |
| 1160 | : "r" (s) |
| 1161 | : "$2", "$4", __UA_t0, "$31"); |
| 1162 | |
| 1163 | return res; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * strlen_user: - Get the size of a string in user space. |
| 1168 | * @str: The string to measure. |
| 1169 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1170 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | * |
| 1172 | * Get the size of a NUL-terminated string in user space. |
| 1173 | * |
| 1174 | * Returns the size of the string INCLUDING the terminating NUL. |
| 1175 | * On exception, returns 0. |
| 1176 | * |
| 1177 | * If there is a limit on the length of a valid string, you may wish to |
| 1178 | * consider using strnlen_user() instead. |
| 1179 | */ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1180 | static inline long strlen_user(const char __user *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | { |
| 1182 | long res; |
| 1183 | |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1184 | might_fault(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | __asm__ __volatile__( |
| 1186 | "move\t$4, %1\n\t" |
| 1187 | __MODULE_JAL(__strlen_user_asm) |
| 1188 | "move\t%0, $2" |
| 1189 | : "=r" (res) |
| 1190 | : "r" (s) |
| 1191 | : "$2", "$4", __UA_t0, "$31"); |
| 1192 | |
| 1193 | return res; |
| 1194 | } |
| 1195 | |
| 1196 | /* Returns: 0 if bad, string length+1 (memory size) of string if ok */ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1197 | static inline long __strnlen_user(const char __user *s, long n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | { |
| 1199 | long res; |
| 1200 | |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1201 | might_fault(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | __asm__ __volatile__( |
| 1203 | "move\t$4, %1\n\t" |
| 1204 | "move\t$5, %2\n\t" |
| 1205 | __MODULE_JAL(__strnlen_user_nocheck_asm) |
| 1206 | "move\t%0, $2" |
| 1207 | : "=r" (res) |
| 1208 | : "r" (s), "r" (n) |
| 1209 | : "$2", "$4", "$5", __UA_t0, "$31"); |
| 1210 | |
| 1211 | return res; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * strlen_user: - Get the size of a string in user space. |
| 1216 | * @str: The string to measure. |
| 1217 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 1218 | * Context: User context only. This function may sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | * |
| 1220 | * Get the size of a NUL-terminated string in user space. |
| 1221 | * |
| 1222 | * Returns the size of the string INCLUDING the terminating NUL. |
| 1223 | * On exception, returns 0. |
| 1224 | * |
| 1225 | * If there is a limit on the length of a valid string, you may wish to |
| 1226 | * consider using strnlen_user() instead. |
| 1227 | */ |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 1228 | static inline long strnlen_user(const char __user *s, long n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | { |
| 1230 | long res; |
| 1231 | |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 1232 | might_fault(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | __asm__ __volatile__( |
| 1234 | "move\t$4, %1\n\t" |
| 1235 | "move\t$5, %2\n\t" |
| 1236 | __MODULE_JAL(__strnlen_user_asm) |
| 1237 | "move\t%0, $2" |
| 1238 | : "=r" (res) |
| 1239 | : "r" (s), "r" (n) |
| 1240 | : "$2", "$4", "$5", __UA_t0, "$31"); |
| 1241 | |
| 1242 | return res; |
| 1243 | } |
| 1244 | |
| 1245 | struct exception_table_entry |
| 1246 | { |
| 1247 | unsigned long insn; |
| 1248 | unsigned long nextinsn; |
| 1249 | }; |
| 1250 | |
| 1251 | extern int fixup_exception(struct pt_regs *regs); |
| 1252 | |
| 1253 | #endif /* _ASM_UACCESS_H */ |