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[mirror_ubuntu-bionic-kernel.git] / arch / x86 / lib / usercopy_32.c
1 /*
2 * User address space access functions.
3 * The non inlined parts of asm-i386/uaccess.h are here.
4 *
5 * Copyright 1997 Andi Kleen <ak@muc.de>
6 * Copyright 1997 Linus Torvalds
7 */
8 #include <linux/export.h>
9 #include <linux/uaccess.h>
10 #include <asm/mmx.h>
11 #include <asm/asm.h>
12
13 #ifdef CONFIG_X86_INTEL_USERCOPY
14 /*
15 * Alignment at which movsl is preferred for bulk memory copies.
16 */
17 struct movsl_mask movsl_mask __read_mostly;
18 #endif
19
20 static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n)
21 {
22 #ifdef CONFIG_X86_INTEL_USERCOPY
23 if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask))
24 return 0;
25 #endif
26 return 1;
27 }
28 #define movsl_is_ok(a1, a2, n) \
29 __movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n))
30
31 /*
32 * Zero Userspace
33 */
34
35 #define __do_clear_user(addr,size) \
36 do { \
37 int __d0; \
38 might_fault(); \
39 __asm__ __volatile__( \
40 ASM_STAC "\n" \
41 "0: rep; stosl\n" \
42 " movl %2,%0\n" \
43 "1: rep; stosb\n" \
44 "2: " ASM_CLAC "\n" \
45 ".section .fixup,\"ax\"\n" \
46 "3: lea 0(%2,%0,4),%0\n" \
47 " jmp 2b\n" \
48 ".previous\n" \
49 _ASM_EXTABLE(0b,3b) \
50 _ASM_EXTABLE(1b,2b) \
51 : "=&c"(size), "=&D" (__d0) \
52 : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \
53 } while (0)
54
55 /**
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.
59 *
60 * Zero a block of memory in user space.
61 *
62 * Returns number of bytes that could not be cleared.
63 * On success, this will be zero.
64 */
65 unsigned long
66 clear_user(void __user *to, unsigned long n)
67 {
68 might_fault();
69 if (access_ok(VERIFY_WRITE, to, n))
70 __do_clear_user(to, n);
71 return n;
72 }
73 EXPORT_SYMBOL(clear_user);
74
75 /**
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.
79 *
80 * Zero a block of memory in user space. Caller must check
81 * the specified block with access_ok() before calling this function.
82 *
83 * Returns number of bytes that could not be cleared.
84 * On success, this will be zero.
85 */
86 unsigned long
87 __clear_user(void __user *to, unsigned long n)
88 {
89 __do_clear_user(to, n);
90 return n;
91 }
92 EXPORT_SYMBOL(__clear_user);
93
94 #ifdef CONFIG_X86_INTEL_USERCOPY
95 static unsigned long
96 __copy_user_intel(void __user *to, const void *from, unsigned long size)
97 {
98 int d0, d1;
99 __asm__ __volatile__(
100 " .align 2,0x90\n"
101 "1: movl 32(%4), %%eax\n"
102 " cmpl $67, %0\n"
103 " jbe 3f\n"
104 "2: movl 64(%4), %%eax\n"
105 " .align 2,0x90\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"
138 " addl $-64, %0\n"
139 " addl $64, %4\n"
140 " addl $64, %3\n"
141 " cmpl $63, %0\n"
142 " ja 1b\n"
143 "35: movl %0, %%eax\n"
144 " shrl $2, %0\n"
145 " andl $3, %%eax\n"
146 " cld\n"
147 "99: rep; movsl\n"
148 "36: movl %%eax, %0\n"
149 "37: rep; movsb\n"
150 "100:\n"
151 ".section .fixup,\"ax\"\n"
152 "101: lea 0(%%eax,%0,4),%0\n"
153 " jmp 100b\n"
154 ".previous\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");
196 return size;
197 }
198
199 static unsigned long __copy_user_intel_nocache(void *to,
200 const void __user *from, unsigned long size)
201 {
202 int d0, d1;
203
204 __asm__ __volatile__(
205 " .align 2,0x90\n"
206 "0: movl 32(%4), %%eax\n"
207 " cmpl $67, %0\n"
208 " jbe 2f\n"
209 "1: movl 64(%4), %%eax\n"
210 " .align 2,0x90\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"
243 " addl $-64, %0\n"
244 " addl $64, %4\n"
245 " addl $64, %3\n"
246 " cmpl $63, %0\n"
247 " ja 0b\n"
248 " sfence \n"
249 "5: movl %0, %%eax\n"
250 " shrl $2, %0\n"
251 " andl $3, %%eax\n"
252 " cld\n"
253 "6: rep; movsl\n"
254 " movl %%eax,%0\n"
255 "7: rep; movsb\n"
256 "8:\n"
257 ".section .fixup,\"ax\"\n"
258 "9: lea 0(%%eax,%0,4),%0\n"
259 "16: jmp 8b\n"
260 ".previous\n"
261 _ASM_EXTABLE(0b,16b)
262 _ASM_EXTABLE(1b,16b)
263 _ASM_EXTABLE(2b,16b)
264 _ASM_EXTABLE(21b,16b)
265 _ASM_EXTABLE(3b,16b)
266 _ASM_EXTABLE(31b,16b)
267 _ASM_EXTABLE(4b,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)
279 _ASM_EXTABLE(6b,9b)
280 _ASM_EXTABLE(7b,16b)
281 : "=&c"(size), "=&D" (d0), "=&S" (d1)
282 : "1"(to), "2"(from), "0"(size)
283 : "eax", "edx", "memory");
284 return size;
285 }
286
287 #else
288
289 /*
290 * Leave these declared but undefined. They should not be any references to
291 * them
292 */
293 unsigned long __copy_user_intel(void __user *to, const void *from,
294 unsigned long size);
295 #endif /* CONFIG_X86_INTEL_USERCOPY */
296
297 /* Generic arbitrary sized copy. */
298 #define __copy_user(to, from, size) \
299 do { \
300 int __d0, __d1, __d2; \
301 __asm__ __volatile__( \
302 " cmp $7,%0\n" \
303 " jbe 1f\n" \
304 " movl %1,%0\n" \
305 " negl %0\n" \
306 " andl $7,%0\n" \
307 " subl %0,%3\n" \
308 "4: rep; movsb\n" \
309 " movl %3,%0\n" \
310 " shrl $2,%0\n" \
311 " andl $3,%3\n" \
312 " .align 2,0x90\n" \
313 "0: rep; movsl\n" \
314 " movl %3,%0\n" \
315 "1: rep; movsb\n" \
316 "2:\n" \
317 ".section .fixup,\"ax\"\n" \
318 "5: addl %3,%0\n" \
319 " jmp 2b\n" \
320 "3: lea 0(%3,%0,4),%0\n" \
321 " jmp 2b\n" \
322 ".previous\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) \
328 : "memory"); \
329 } while (0)
330
331 unsigned long __copy_user_ll(void *to, const void *from, unsigned long n)
332 {
333 stac();
334 if (movsl_is_ok(to, from, n))
335 __copy_user(to, from, n);
336 else
337 n = __copy_user_intel(to, from, n);
338 clac();
339 return n;
340 }
341 EXPORT_SYMBOL(__copy_user_ll);
342
343 unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
344 unsigned long n)
345 {
346 stac();
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);
350 else
351 __copy_user(to, from, n);
352 #else
353 __copy_user(to, from, n);
354 #endif
355 clac();
356 return n;
357 }
358 EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);
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