2 * User address space access functions.
3 * The non inlined parts of asm-i386/uaccess.h are here.
5 * Copyright 1997 Andi Kleen <ak@muc.de>
6 * Copyright 1997 Linus Torvalds
8 #include <linux/export.h>
9 #include <linux/uaccess.h>
13 #ifdef CONFIG_X86_INTEL_USERCOPY
15 * Alignment at which movsl is preferred for bulk memory copies.
17 struct movsl_mask movsl_mask __read_mostly;
20 static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n)
22 #ifdef CONFIG_X86_INTEL_USERCOPY
23 if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask))
28 #define movsl_is_ok(a1, a2, n) \
29 __movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n))
35 #define __do_clear_user(addr,size) \
39 __asm__ __volatile__( \
45 ".section .fixup,\"ax\"\n" \
46 "3: lea 0(%2,%0,4),%0\n" \
51 : "=&c"(size), "=&D" (__d0) \
52 : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \
56 * clear_user: - Zero a block of memory in user space.
57 * @to: Destination address, in user space.
58 * @n: Number of bytes to zero.
60 * Zero a block of memory in user space.
62 * Returns number of bytes that could not be cleared.
63 * On success, this will be zero.
66 clear_user(void __user *to, unsigned long n)
69 if (access_ok(VERIFY_WRITE, to, n))
70 __do_clear_user(to, n);
73 EXPORT_SYMBOL(clear_user);
76 * __clear_user: - Zero a block of memory in user space, with less checking.
77 * @to: Destination address, in user space.
78 * @n: Number of bytes to zero.
80 * Zero a block of memory in user space. Caller must check
81 * the specified block with access_ok() before calling this function.
83 * Returns number of bytes that could not be cleared.
84 * On success, this will be zero.
87 __clear_user(void __user *to, unsigned long n)
89 __do_clear_user(to, n);
92 EXPORT_SYMBOL(__clear_user);
94 #ifdef CONFIG_X86_INTEL_USERCOPY
96 __copy_user_intel(void __user *to, const void *from, unsigned long size)
101 "1: movl 32(%4), %%eax\n"
104 "2: movl 64(%4), %%eax\n"
106 "3: movl 0(%4), %%eax\n"
107 "4: movl 4(%4), %%edx\n"
108 "5: movl %%eax, 0(%3)\n"
109 "6: movl %%edx, 4(%3)\n"
110 "7: movl 8(%4), %%eax\n"
111 "8: movl 12(%4),%%edx\n"
112 "9: movl %%eax, 8(%3)\n"
113 "10: movl %%edx, 12(%3)\n"
114 "11: movl 16(%4), %%eax\n"
115 "12: movl 20(%4), %%edx\n"
116 "13: movl %%eax, 16(%3)\n"
117 "14: movl %%edx, 20(%3)\n"
118 "15: movl 24(%4), %%eax\n"
119 "16: movl 28(%4), %%edx\n"
120 "17: movl %%eax, 24(%3)\n"
121 "18: movl %%edx, 28(%3)\n"
122 "19: movl 32(%4), %%eax\n"
123 "20: movl 36(%4), %%edx\n"
124 "21: movl %%eax, 32(%3)\n"
125 "22: movl %%edx, 36(%3)\n"
126 "23: movl 40(%4), %%eax\n"
127 "24: movl 44(%4), %%edx\n"
128 "25: movl %%eax, 40(%3)\n"
129 "26: movl %%edx, 44(%3)\n"
130 "27: movl 48(%4), %%eax\n"
131 "28: movl 52(%4), %%edx\n"
132 "29: movl %%eax, 48(%3)\n"
133 "30: movl %%edx, 52(%3)\n"
134 "31: movl 56(%4), %%eax\n"
135 "32: movl 60(%4), %%edx\n"
136 "33: movl %%eax, 56(%3)\n"
137 "34: movl %%edx, 60(%3)\n"
143 "35: movl %0, %%eax\n"
148 "36: movl %%eax, %0\n"
151 ".section .fixup,\"ax\"\n"
152 "101: lea 0(%%eax,%0,4),%0\n"
155 _ASM_EXTABLE(1b,100b)
156 _ASM_EXTABLE(2b,100b)
157 _ASM_EXTABLE(3b,100b)
158 _ASM_EXTABLE(4b,100b)
159 _ASM_EXTABLE(5b,100b)
160 _ASM_EXTABLE(6b,100b)
161 _ASM_EXTABLE(7b,100b)
162 _ASM_EXTABLE(8b,100b)
163 _ASM_EXTABLE(9b,100b)
164 _ASM_EXTABLE(10b,100b)
165 _ASM_EXTABLE(11b,100b)
166 _ASM_EXTABLE(12b,100b)
167 _ASM_EXTABLE(13b,100b)
168 _ASM_EXTABLE(14b,100b)
169 _ASM_EXTABLE(15b,100b)
170 _ASM_EXTABLE(16b,100b)
171 _ASM_EXTABLE(17b,100b)
172 _ASM_EXTABLE(18b,100b)
173 _ASM_EXTABLE(19b,100b)
174 _ASM_EXTABLE(20b,100b)
175 _ASM_EXTABLE(21b,100b)
176 _ASM_EXTABLE(22b,100b)
177 _ASM_EXTABLE(23b,100b)
178 _ASM_EXTABLE(24b,100b)
179 _ASM_EXTABLE(25b,100b)
180 _ASM_EXTABLE(26b,100b)
181 _ASM_EXTABLE(27b,100b)
182 _ASM_EXTABLE(28b,100b)
183 _ASM_EXTABLE(29b,100b)
184 _ASM_EXTABLE(30b,100b)
185 _ASM_EXTABLE(31b,100b)
186 _ASM_EXTABLE(32b,100b)
187 _ASM_EXTABLE(33b,100b)
188 _ASM_EXTABLE(34b,100b)
189 _ASM_EXTABLE(35b,100b)
190 _ASM_EXTABLE(36b,100b)
191 _ASM_EXTABLE(37b,100b)
192 _ASM_EXTABLE(99b,101b)
193 : "=&c"(size), "=&D" (d0), "=&S" (d1)
194 : "1"(to), "2"(from), "0"(size)
195 : "eax", "edx", "memory");
199 static unsigned long __copy_user_intel_nocache(void *to,
200 const void __user *from, unsigned long size)
204 __asm__ __volatile__(
206 "0: movl 32(%4), %%eax\n"
209 "1: movl 64(%4), %%eax\n"
211 "2: movl 0(%4), %%eax\n"
212 "21: movl 4(%4), %%edx\n"
213 " movnti %%eax, 0(%3)\n"
214 " movnti %%edx, 4(%3)\n"
215 "3: movl 8(%4), %%eax\n"
216 "31: movl 12(%4),%%edx\n"
217 " movnti %%eax, 8(%3)\n"
218 " movnti %%edx, 12(%3)\n"
219 "4: movl 16(%4), %%eax\n"
220 "41: movl 20(%4), %%edx\n"
221 " movnti %%eax, 16(%3)\n"
222 " movnti %%edx, 20(%3)\n"
223 "10: movl 24(%4), %%eax\n"
224 "51: movl 28(%4), %%edx\n"
225 " movnti %%eax, 24(%3)\n"
226 " movnti %%edx, 28(%3)\n"
227 "11: movl 32(%4), %%eax\n"
228 "61: movl 36(%4), %%edx\n"
229 " movnti %%eax, 32(%3)\n"
230 " movnti %%edx, 36(%3)\n"
231 "12: movl 40(%4), %%eax\n"
232 "71: movl 44(%4), %%edx\n"
233 " movnti %%eax, 40(%3)\n"
234 " movnti %%edx, 44(%3)\n"
235 "13: movl 48(%4), %%eax\n"
236 "81: movl 52(%4), %%edx\n"
237 " movnti %%eax, 48(%3)\n"
238 " movnti %%edx, 52(%3)\n"
239 "14: movl 56(%4), %%eax\n"
240 "91: movl 60(%4), %%edx\n"
241 " movnti %%eax, 56(%3)\n"
242 " movnti %%edx, 60(%3)\n"
249 "5: movl %0, %%eax\n"
257 ".section .fixup,\"ax\"\n"
258 "9: lea 0(%%eax,%0,4),%0\n"
264 _ASM_EXTABLE(21b,16b)
266 _ASM_EXTABLE(31b,16b)
268 _ASM_EXTABLE(41b,16b)
269 _ASM_EXTABLE(10b,16b)
270 _ASM_EXTABLE(51b,16b)
271 _ASM_EXTABLE(11b,16b)
272 _ASM_EXTABLE(61b,16b)
273 _ASM_EXTABLE(12b,16b)
274 _ASM_EXTABLE(71b,16b)
275 _ASM_EXTABLE(13b,16b)
276 _ASM_EXTABLE(81b,16b)
277 _ASM_EXTABLE(14b,16b)
278 _ASM_EXTABLE(91b,16b)
281 : "=&c"(size), "=&D" (d0), "=&S" (d1)
282 : "1"(to), "2"(from), "0"(size)
283 : "eax", "edx", "memory");
290 * Leave these declared but undefined. They should not be any references to
293 unsigned long __copy_user_intel(void __user *to, const void *from,
295 #endif /* CONFIG_X86_INTEL_USERCOPY */
297 /* Generic arbitrary sized copy. */
298 #define __copy_user(to, from, size) \
300 int __d0, __d1, __d2; \
301 __asm__ __volatile__( \
317 ".section .fixup,\"ax\"\n" \
320 "3: lea 0(%3,%0,4),%0\n" \
323 _ASM_EXTABLE(4b,5b) \
324 _ASM_EXTABLE(0b,3b) \
325 _ASM_EXTABLE(1b,2b) \
326 : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
327 : "3"(size), "0"(size), "1"(to), "2"(from) \
331 unsigned long __copy_user_ll(void *to, const void *from, unsigned long n)
334 if (movsl_is_ok(to, from, n))
335 __copy_user(to, from, n);
337 n = __copy_user_intel(to, from, n);
341 EXPORT_SYMBOL(__copy_user_ll);
343 unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
347 #ifdef CONFIG_X86_INTEL_USERCOPY
348 if (n > 64 && static_cpu_has(X86_FEATURE_XMM2))
349 n = __copy_user_intel_nocache(to, from, n);
351 __copy_user(to, from, n);
353 __copy_user(to, from, n);
358 EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);