1 // SPDX-License-Identifier: GPL-2.0
3 * User address space access functions.
4 * The non inlined parts of asm-i386/uaccess.h are here.
6 * Copyright 1997 Andi Kleen <ak@muc.de>
7 * Copyright 1997 Linus Torvalds
9 #include <linux/export.h>
10 #include <linux/uaccess.h>
14 #ifdef CONFIG_X86_INTEL_USERCOPY
16 * Alignment at which movsl is preferred for bulk memory copies.
18 struct movsl_mask movsl_mask __read_mostly;
21 static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n)
23 #ifdef CONFIG_X86_INTEL_USERCOPY
24 if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask))
29 #define movsl_is_ok(a1, a2, n) \
30 __movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n))
36 #define __do_clear_user(addr,size) \
40 __asm__ __volatile__( \
46 ".section .fixup,\"ax\"\n" \
47 "3: lea 0(%2,%0,4),%0\n" \
50 _ASM_EXTABLE_UA(0b, 3b) \
51 _ASM_EXTABLE_UA(1b, 2b) \
52 : "=&c"(size), "=&D" (__d0) \
53 : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \
57 * clear_user - Zero a block of memory in user space.
58 * @to: Destination address, in user space.
59 * @n: Number of bytes to zero.
61 * Zero a block of memory in user space.
63 * Return: number of bytes that could not be cleared.
64 * On success, this will be zero.
67 clear_user(void __user *to, unsigned long n)
71 __do_clear_user(to, n);
74 EXPORT_SYMBOL(clear_user);
77 * __clear_user - Zero a block of memory in user space, with less checking.
78 * @to: Destination address, in user space.
79 * @n: Number of bytes to zero.
81 * Zero a block of memory in user space. Caller must check
82 * the specified block with access_ok() before calling this function.
84 * Return: number of bytes that could not be cleared.
85 * On success, this will be zero.
88 __clear_user(void __user *to, unsigned long n)
90 __do_clear_user(to, n);
93 EXPORT_SYMBOL(__clear_user);
95 #ifdef CONFIG_X86_INTEL_USERCOPY
97 __copy_user_intel(void __user *to, const void *from, unsigned long size)
100 __asm__ __volatile__(
102 "1: movl 32(%4), %%eax\n"
105 "2: movl 64(%4), %%eax\n"
107 "3: movl 0(%4), %%eax\n"
108 "4: movl 4(%4), %%edx\n"
109 "5: movl %%eax, 0(%3)\n"
110 "6: movl %%edx, 4(%3)\n"
111 "7: movl 8(%4), %%eax\n"
112 "8: movl 12(%4),%%edx\n"
113 "9: movl %%eax, 8(%3)\n"
114 "10: movl %%edx, 12(%3)\n"
115 "11: movl 16(%4), %%eax\n"
116 "12: movl 20(%4), %%edx\n"
117 "13: movl %%eax, 16(%3)\n"
118 "14: movl %%edx, 20(%3)\n"
119 "15: movl 24(%4), %%eax\n"
120 "16: movl 28(%4), %%edx\n"
121 "17: movl %%eax, 24(%3)\n"
122 "18: movl %%edx, 28(%3)\n"
123 "19: movl 32(%4), %%eax\n"
124 "20: movl 36(%4), %%edx\n"
125 "21: movl %%eax, 32(%3)\n"
126 "22: movl %%edx, 36(%3)\n"
127 "23: movl 40(%4), %%eax\n"
128 "24: movl 44(%4), %%edx\n"
129 "25: movl %%eax, 40(%3)\n"
130 "26: movl %%edx, 44(%3)\n"
131 "27: movl 48(%4), %%eax\n"
132 "28: movl 52(%4), %%edx\n"
133 "29: movl %%eax, 48(%3)\n"
134 "30: movl %%edx, 52(%3)\n"
135 "31: movl 56(%4), %%eax\n"
136 "32: movl 60(%4), %%edx\n"
137 "33: movl %%eax, 56(%3)\n"
138 "34: movl %%edx, 60(%3)\n"
144 "35: movl %0, %%eax\n"
149 "36: movl %%eax, %0\n"
152 ".section .fixup,\"ax\"\n"
153 "101: lea 0(%%eax,%0,4),%0\n"
156 _ASM_EXTABLE_UA(1b, 100b)
157 _ASM_EXTABLE_UA(2b, 100b)
158 _ASM_EXTABLE_UA(3b, 100b)
159 _ASM_EXTABLE_UA(4b, 100b)
160 _ASM_EXTABLE_UA(5b, 100b)
161 _ASM_EXTABLE_UA(6b, 100b)
162 _ASM_EXTABLE_UA(7b, 100b)
163 _ASM_EXTABLE_UA(8b, 100b)
164 _ASM_EXTABLE_UA(9b, 100b)
165 _ASM_EXTABLE_UA(10b, 100b)
166 _ASM_EXTABLE_UA(11b, 100b)
167 _ASM_EXTABLE_UA(12b, 100b)
168 _ASM_EXTABLE_UA(13b, 100b)
169 _ASM_EXTABLE_UA(14b, 100b)
170 _ASM_EXTABLE_UA(15b, 100b)
171 _ASM_EXTABLE_UA(16b, 100b)
172 _ASM_EXTABLE_UA(17b, 100b)
173 _ASM_EXTABLE_UA(18b, 100b)
174 _ASM_EXTABLE_UA(19b, 100b)
175 _ASM_EXTABLE_UA(20b, 100b)
176 _ASM_EXTABLE_UA(21b, 100b)
177 _ASM_EXTABLE_UA(22b, 100b)
178 _ASM_EXTABLE_UA(23b, 100b)
179 _ASM_EXTABLE_UA(24b, 100b)
180 _ASM_EXTABLE_UA(25b, 100b)
181 _ASM_EXTABLE_UA(26b, 100b)
182 _ASM_EXTABLE_UA(27b, 100b)
183 _ASM_EXTABLE_UA(28b, 100b)
184 _ASM_EXTABLE_UA(29b, 100b)
185 _ASM_EXTABLE_UA(30b, 100b)
186 _ASM_EXTABLE_UA(31b, 100b)
187 _ASM_EXTABLE_UA(32b, 100b)
188 _ASM_EXTABLE_UA(33b, 100b)
189 _ASM_EXTABLE_UA(34b, 100b)
190 _ASM_EXTABLE_UA(35b, 100b)
191 _ASM_EXTABLE_UA(36b, 100b)
192 _ASM_EXTABLE_UA(37b, 100b)
193 _ASM_EXTABLE_UA(99b, 101b)
194 : "=&c"(size), "=&D" (d0), "=&S" (d1)
195 : "1"(to), "2"(from), "0"(size)
196 : "eax", "edx", "memory");
200 static unsigned long __copy_user_intel_nocache(void *to,
201 const void __user *from, unsigned long size)
205 __asm__ __volatile__(
207 "0: movl 32(%4), %%eax\n"
210 "1: movl 64(%4), %%eax\n"
212 "2: movl 0(%4), %%eax\n"
213 "21: movl 4(%4), %%edx\n"
214 " movnti %%eax, 0(%3)\n"
215 " movnti %%edx, 4(%3)\n"
216 "3: movl 8(%4), %%eax\n"
217 "31: movl 12(%4),%%edx\n"
218 " movnti %%eax, 8(%3)\n"
219 " movnti %%edx, 12(%3)\n"
220 "4: movl 16(%4), %%eax\n"
221 "41: movl 20(%4), %%edx\n"
222 " movnti %%eax, 16(%3)\n"
223 " movnti %%edx, 20(%3)\n"
224 "10: movl 24(%4), %%eax\n"
225 "51: movl 28(%4), %%edx\n"
226 " movnti %%eax, 24(%3)\n"
227 " movnti %%edx, 28(%3)\n"
228 "11: movl 32(%4), %%eax\n"
229 "61: movl 36(%4), %%edx\n"
230 " movnti %%eax, 32(%3)\n"
231 " movnti %%edx, 36(%3)\n"
232 "12: movl 40(%4), %%eax\n"
233 "71: movl 44(%4), %%edx\n"
234 " movnti %%eax, 40(%3)\n"
235 " movnti %%edx, 44(%3)\n"
236 "13: movl 48(%4), %%eax\n"
237 "81: movl 52(%4), %%edx\n"
238 " movnti %%eax, 48(%3)\n"
239 " movnti %%edx, 52(%3)\n"
240 "14: movl 56(%4), %%eax\n"
241 "91: movl 60(%4), %%edx\n"
242 " movnti %%eax, 56(%3)\n"
243 " movnti %%edx, 60(%3)\n"
250 "5: movl %0, %%eax\n"
258 ".section .fixup,\"ax\"\n"
259 "9: lea 0(%%eax,%0,4),%0\n"
262 _ASM_EXTABLE_UA(0b, 16b)
263 _ASM_EXTABLE_UA(1b, 16b)
264 _ASM_EXTABLE_UA(2b, 16b)
265 _ASM_EXTABLE_UA(21b, 16b)
266 _ASM_EXTABLE_UA(3b, 16b)
267 _ASM_EXTABLE_UA(31b, 16b)
268 _ASM_EXTABLE_UA(4b, 16b)
269 _ASM_EXTABLE_UA(41b, 16b)
270 _ASM_EXTABLE_UA(10b, 16b)
271 _ASM_EXTABLE_UA(51b, 16b)
272 _ASM_EXTABLE_UA(11b, 16b)
273 _ASM_EXTABLE_UA(61b, 16b)
274 _ASM_EXTABLE_UA(12b, 16b)
275 _ASM_EXTABLE_UA(71b, 16b)
276 _ASM_EXTABLE_UA(13b, 16b)
277 _ASM_EXTABLE_UA(81b, 16b)
278 _ASM_EXTABLE_UA(14b, 16b)
279 _ASM_EXTABLE_UA(91b, 16b)
280 _ASM_EXTABLE_UA(6b, 9b)
281 _ASM_EXTABLE_UA(7b, 16b)
282 : "=&c"(size), "=&D" (d0), "=&S" (d1)
283 : "1"(to), "2"(from), "0"(size)
284 : "eax", "edx", "memory");
291 * Leave these declared but undefined. They should not be any references to
294 unsigned long __copy_user_intel(void __user *to, const void *from,
296 #endif /* CONFIG_X86_INTEL_USERCOPY */
298 /* Generic arbitrary sized copy. */
299 #define __copy_user(to, from, size) \
301 int __d0, __d1, __d2; \
302 __asm__ __volatile__( \
318 ".section .fixup,\"ax\"\n" \
321 "3: lea 0(%3,%0,4),%0\n" \
324 _ASM_EXTABLE_UA(4b, 5b) \
325 _ASM_EXTABLE_UA(0b, 3b) \
326 _ASM_EXTABLE_UA(1b, 2b) \
327 : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
328 : "3"(size), "0"(size), "1"(to), "2"(from) \
332 unsigned long __copy_user_ll(void *to, const void *from, unsigned long n)
334 __uaccess_begin_nospec();
335 if (movsl_is_ok(to, from, n))
336 __copy_user(to, from, n);
338 n = __copy_user_intel(to, from, n);
342 EXPORT_SYMBOL(__copy_user_ll);
344 unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
347 __uaccess_begin_nospec();
348 #ifdef CONFIG_X86_INTEL_USERCOPY
349 if (n > 64 && static_cpu_has(X86_FEATURE_XMM2))
350 n = __copy_user_intel_nocache(to, from, n);
352 __copy_user(to, from, n);
354 __copy_user(to, from, n);
359 EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);