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10#ifndef __S390_UACCESS_H
11#define __S390_UACCESS_H
12
13
14
15
16#include <asm/processor.h>
17#include <asm/ctl_reg.h>
18#include <asm/extable.h>
19#include <asm/facility.h>
20
21void debug_user_asce(int exit);
22
23static inline int __range_ok(unsigned long addr, unsigned long size)
24{
25 return 1;
26}
27
28#define __access_ok(addr, size) \
29({ \
30 __chk_user_ptr(addr); \
31 __range_ok((unsigned long)(addr), (size)); \
32})
33
34#define access_ok(addr, size) __access_ok(addr, size)
35
36unsigned long __must_check
37raw_copy_from_user(void *to, const void __user *from, unsigned long n);
38
39unsigned long __must_check
40raw_copy_to_user(void __user *to, const void *from, unsigned long n);
41
42#ifndef CONFIG_KASAN
43#define INLINE_COPY_FROM_USER
44#define INLINE_COPY_TO_USER
45#endif
46
47int __put_user_bad(void) __attribute__((noreturn));
48int __get_user_bad(void) __attribute__((noreturn));
49
50#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
51
52#define __put_get_user_asm(to, from, size, insn) \
53({ \
54 int __rc; \
55 \
56 asm volatile( \
57 insn " 0,%[spec]\n" \
58 "0: mvcos %[_to],%[_from],%[_size]\n" \
59 "1: xr %[rc],%[rc]\n" \
60 "2:\n" \
61 ".pushsection .fixup, \"ax\"\n" \
62 "3: lhi %[rc],%[retval]\n" \
63 " jg 2b\n" \
64 ".popsection\n" \
65 EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
66 : [rc] "=&d" (__rc), [_to] "+Q" (*(to)) \
67 : [_size] "d" (size), [_from] "Q" (*(from)), \
68 [retval] "K" (-EFAULT), [spec] "K" (0x81UL) \
69 : "cc", "0"); \
70 __rc; \
71})
72
73static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
74{
75 int rc;
76
77 switch (size) {
78 case 1:
79 rc = __put_get_user_asm((unsigned char __user *)ptr,
80 (unsigned char *)x,
81 size, "llilh");
82 break;
83 case 2:
84 rc = __put_get_user_asm((unsigned short __user *)ptr,
85 (unsigned short *)x,
86 size, "llilh");
87 break;
88 case 4:
89 rc = __put_get_user_asm((unsigned int __user *)ptr,
90 (unsigned int *)x,
91 size, "llilh");
92 break;
93 case 8:
94 rc = __put_get_user_asm((unsigned long __user *)ptr,
95 (unsigned long *)x,
96 size, "llilh");
97 break;
98 default:
99 __put_user_bad();
100 break;
101 }
102 return rc;
103}
104
105static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
106{
107 int rc;
108
109 switch (size) {
110 case 1:
111 rc = __put_get_user_asm((unsigned char *)x,
112 (unsigned char __user *)ptr,
113 size, "lghi");
114 break;
115 case 2:
116 rc = __put_get_user_asm((unsigned short *)x,
117 (unsigned short __user *)ptr,
118 size, "lghi");
119 break;
120 case 4:
121 rc = __put_get_user_asm((unsigned int *)x,
122 (unsigned int __user *)ptr,
123 size, "lghi");
124 break;
125 case 8:
126 rc = __put_get_user_asm((unsigned long *)x,
127 (unsigned long __user *)ptr,
128 size, "lghi");
129 break;
130 default:
131 __get_user_bad();
132 break;
133 }
134 return rc;
135}
136
137#else
138
139static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
140{
141 size = raw_copy_to_user(ptr, x, size);
142 return size ? -EFAULT : 0;
143}
144
145static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
146{
147 size = raw_copy_from_user(x, ptr, size);
148 return size ? -EFAULT : 0;
149}
150
151#endif
152
153
154
155
156
157#define __put_user(x, ptr) \
158({ \
159 __typeof__(*(ptr)) __x = (x); \
160 int __pu_err = -EFAULT; \
161 __chk_user_ptr(ptr); \
162 switch (sizeof (*(ptr))) { \
163 case 1: \
164 case 2: \
165 case 4: \
166 case 8: \
167 __pu_err = __put_user_fn(&__x, ptr, \
168 sizeof(*(ptr))); \
169 break; \
170 default: \
171 __put_user_bad(); \
172 break; \
173 } \
174 __builtin_expect(__pu_err, 0); \
175})
176
177#define put_user(x, ptr) \
178({ \
179 might_fault(); \
180 __put_user(x, ptr); \
181})
182
183
184#define __get_user(x, ptr) \
185({ \
186 int __gu_err = -EFAULT; \
187 __chk_user_ptr(ptr); \
188 switch (sizeof(*(ptr))) { \
189 case 1: { \
190 unsigned char __x = 0; \
191 __gu_err = __get_user_fn(&__x, ptr, \
192 sizeof(*(ptr))); \
193 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
194 break; \
195 }; \
196 case 2: { \
197 unsigned short __x = 0; \
198 __gu_err = __get_user_fn(&__x, ptr, \
199 sizeof(*(ptr))); \
200 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
201 break; \
202 }; \
203 case 4: { \
204 unsigned int __x = 0; \
205 __gu_err = __get_user_fn(&__x, ptr, \
206 sizeof(*(ptr))); \
207 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
208 break; \
209 }; \
210 case 8: { \
211 unsigned long long __x = 0; \
212 __gu_err = __get_user_fn(&__x, ptr, \
213 sizeof(*(ptr))); \
214 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
215 break; \
216 }; \
217 default: \
218 __get_user_bad(); \
219 break; \
220 } \
221 __builtin_expect(__gu_err, 0); \
222})
223
224#define get_user(x, ptr) \
225({ \
226 might_fault(); \
227 __get_user(x, ptr); \
228})
229
230unsigned long __must_check
231raw_copy_in_user(void __user *to, const void __user *from, unsigned long n);
232
233
234
235
236
237long __strncpy_from_user(char *dst, const char __user *src, long count);
238
239static inline long __must_check
240strncpy_from_user(char *dst, const char __user *src, long count)
241{
242 might_fault();
243 return __strncpy_from_user(dst, src, count);
244}
245
246unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
247
248static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
249{
250 might_fault();
251 return __strnlen_user(src, n);
252}
253
254
255
256
257unsigned long __must_check __clear_user(void __user *to, unsigned long size);
258
259static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
260{
261 might_fault();
262 return __clear_user(to, n);
263}
264
265int copy_to_user_real(void __user *dest, void *src, unsigned long count);
266void *s390_kernel_write(void *dst, const void *src, size_t size);
267
268#define HAVE_GET_KERNEL_NOFAULT
269
270int __noreturn __put_kernel_bad(void);
271
272#define __put_kernel_asm(val, to, insn) \
273({ \
274 int __rc; \
275 \
276 asm volatile( \
277 "0: " insn " %2,%1\n" \
278 "1: xr %0,%0\n" \
279 "2:\n" \
280 ".pushsection .fixup, \"ax\"\n" \
281 "3: lhi %0,%3\n" \
282 " jg 2b\n" \
283 ".popsection\n" \
284 EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
285 : "=d" (__rc), "+Q" (*(to)) \
286 : "d" (val), "K" (-EFAULT) \
287 : "cc"); \
288 __rc; \
289})
290
291#define __put_kernel_nofault(dst, src, type, err_label) \
292do { \
293 u64 __x = (u64)(*((type *)(src))); \
294 int __pk_err; \
295 \
296 switch (sizeof(type)) { \
297 case 1: \
298 __pk_err = __put_kernel_asm(__x, (type *)(dst), "stc"); \
299 break; \
300 case 2: \
301 __pk_err = __put_kernel_asm(__x, (type *)(dst), "sth"); \
302 break; \
303 case 4: \
304 __pk_err = __put_kernel_asm(__x, (type *)(dst), "st"); \
305 break; \
306 case 8: \
307 __pk_err = __put_kernel_asm(__x, (type *)(dst), "stg"); \
308 break; \
309 default: \
310 __pk_err = __put_kernel_bad(); \
311 break; \
312 } \
313 if (unlikely(__pk_err)) \
314 goto err_label; \
315} while (0)
316
317int __noreturn __get_kernel_bad(void);
318
319#define __get_kernel_asm(val, from, insn) \
320({ \
321 int __rc; \
322 \
323 asm volatile( \
324 "0: " insn " %1,%2\n" \
325 "1: xr %0,%0\n" \
326 "2:\n" \
327 ".pushsection .fixup, \"ax\"\n" \
328 "3: lhi %0,%3\n" \
329 " jg 2b\n" \
330 ".popsection\n" \
331 EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
332 : "=d" (__rc), "+d" (val) \
333 : "Q" (*(from)), "K" (-EFAULT) \
334 : "cc"); \
335 __rc; \
336})
337
338#define __get_kernel_nofault(dst, src, type, err_label) \
339do { \
340 int __gk_err; \
341 \
342 switch (sizeof(type)) { \
343 case 1: { \
344 u8 __x = 0; \
345 \
346 __gk_err = __get_kernel_asm(__x, (type *)(src), "ic"); \
347 *((type *)(dst)) = (type)__x; \
348 break; \
349 }; \
350 case 2: { \
351 u16 __x = 0; \
352 \
353 __gk_err = __get_kernel_asm(__x, (type *)(src), "lh"); \
354 *((type *)(dst)) = (type)__x; \
355 break; \
356 }; \
357 case 4: { \
358 u32 __x = 0; \
359 \
360 __gk_err = __get_kernel_asm(__x, (type *)(src), "l"); \
361 *((type *)(dst)) = (type)__x; \
362 break; \
363 }; \
364 case 8: { \
365 u64 __x = 0; \
366 \
367 __gk_err = __get_kernel_asm(__x, (type *)(src), "lg"); \
368 *((type *)(dst)) = (type)__x; \
369 break; \
370 }; \
371 default: \
372 __gk_err = __get_kernel_bad(); \
373 break; \
374 } \
375 if (unlikely(__gk_err)) \
376 goto err_label; \
377} while (0)
378
379#endif
380
