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-rw-r--r--include/asm-s390/uaccess.h363
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diff --git a/include/asm-s390/uaccess.h b/include/asm-s390/uaccess.h
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1/*
2 * include/asm-s390/uaccess.h
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "include/asm-i386/uaccess.h"
10 */
11#ifndef __S390_UACCESS_H
12#define __S390_UACCESS_H
13
14/*
15 * User space memory access functions
16 */
17#include <linux/sched.h>
18#include <linux/errno.h>
19
20#define VERIFY_READ 0
21#define VERIFY_WRITE 1
22
23
24/*
25 * The fs value determines whether argument validity checking should be
26 * performed or not. If get_fs() == USER_DS, checking is performed, with
27 * get_fs() == KERNEL_DS, checking is bypassed.
28 *
29 * For historical reasons, these macros are grossly misnamed.
30 */
31
32#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })
33
34
35#define KERNEL_DS MAKE_MM_SEG(0)
36#define USER_DS MAKE_MM_SEG(1)
37
38#define get_ds() (KERNEL_DS)
39#define get_fs() (current->thread.mm_segment)
40
41#define set_fs(x) \
42({ \
43 unsigned long __pto; \
44 current->thread.mm_segment = (x); \
45 __pto = current->thread.mm_segment.ar4 ? \
46 S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
47 __ctl_load(__pto, 7, 7); \
48})
49
50#define segment_eq(a,b) ((a).ar4 == (b).ar4)
51
52
53static inline int __access_ok(const void __user *addr, unsigned long size)
54{
55 return 1;
56}
57#define access_ok(type,addr,size) __access_ok(addr,size)
58
59/*
60 * The exception table consists of pairs of addresses: the first is the
61 * address of an instruction that is allowed to fault, and the second is
62 * the address at which the program should continue. No registers are
63 * modified, so it is entirely up to the continuation code to figure out
64 * what to do.
65 *
66 * All the routines below use bits of fixup code that are out of line
67 * with the main instruction path. This means when everything is well,
68 * we don't even have to jump over them. Further, they do not intrude
69 * on our cache or tlb entries.
70 */
71
72struct exception_table_entry
73{
74 unsigned long insn, fixup;
75};
76
77struct uaccess_ops {
78 size_t (*copy_from_user)(size_t, const void __user *, void *);
79 size_t (*copy_from_user_small)(size_t, const void __user *, void *);
80 size_t (*copy_to_user)(size_t, void __user *, const void *);
81 size_t (*copy_to_user_small)(size_t, void __user *, const void *);
82 size_t (*copy_in_user)(size_t, void __user *, const void __user *);
83 size_t (*clear_user)(size_t, void __user *);
84 size_t (*strnlen_user)(size_t, const char __user *);
85 size_t (*strncpy_from_user)(size_t, const char __user *, char *);
86 int (*futex_atomic_op)(int op, int __user *, int oparg, int *old);
87 int (*futex_atomic_cmpxchg)(int __user *, int old, int new);
88};
89
90extern struct uaccess_ops uaccess;
91extern struct uaccess_ops uaccess_std;
92extern struct uaccess_ops uaccess_mvcos;
93extern struct uaccess_ops uaccess_mvcos_switch;
94extern struct uaccess_ops uaccess_pt;
95
96static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
97{
98 size = uaccess.copy_to_user_small(size, ptr, x);
99 return size ? -EFAULT : size;
100}
101
102static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
103{
104 size = uaccess.copy_from_user_small(size, ptr, x);
105 return size ? -EFAULT : size;
106}
107
108/*
109 * These are the main single-value transfer routines. They automatically
110 * use the right size if we just have the right pointer type.
111 */
112#define __put_user(x, ptr) \
113({ \
114 __typeof__(*(ptr)) __x = (x); \
115 int __pu_err = -EFAULT; \
116 __chk_user_ptr(ptr); \
117 switch (sizeof (*(ptr))) { \
118 case 1: \
119 case 2: \
120 case 4: \
121 case 8: \
122 __pu_err = __put_user_fn(sizeof (*(ptr)), \
123 ptr, &__x); \
124 break; \
125 default: \
126 __put_user_bad(); \
127 break; \
128 } \
129 __pu_err; \
130})
131
132#define put_user(x, ptr) \
133({ \
134 might_sleep(); \
135 __put_user(x, ptr); \
136})
137
138
139extern int __put_user_bad(void) __attribute__((noreturn));
140
141#define __get_user(x, ptr) \
142({ \
143 int __gu_err = -EFAULT; \
144 __chk_user_ptr(ptr); \
145 switch (sizeof(*(ptr))) { \
146 case 1: { \
147 unsigned char __x; \
148 __gu_err = __get_user_fn(sizeof (*(ptr)), \
149 ptr, &__x); \
150 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
151 break; \
152 }; \
153 case 2: { \
154 unsigned short __x; \
155 __gu_err = __get_user_fn(sizeof (*(ptr)), \
156 ptr, &__x); \
157 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
158 break; \
159 }; \
160 case 4: { \
161 unsigned int __x; \
162 __gu_err = __get_user_fn(sizeof (*(ptr)), \
163 ptr, &__x); \
164 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
165 break; \
166 }; \
167 case 8: { \
168 unsigned long long __x; \
169 __gu_err = __get_user_fn(sizeof (*(ptr)), \
170 ptr, &__x); \
171 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
172 break; \
173 }; \
174 default: \
175 __get_user_bad(); \
176 break; \
177 } \
178 __gu_err; \
179})
180
181#define get_user(x, ptr) \
182({ \
183 might_sleep(); \
184 __get_user(x, ptr); \
185})
186
187extern int __get_user_bad(void) __attribute__((noreturn));
188
189#define __put_user_unaligned __put_user
190#define __get_user_unaligned __get_user
191
192/**
193 * __copy_to_user: - Copy a block of data into user space, with less checking.
194 * @to: Destination address, in user space.
195 * @from: Source address, in kernel space.
196 * @n: Number of bytes to copy.
197 *
198 * Context: User context only. This function may sleep.
199 *
200 * Copy data from kernel space to user space. Caller must check
201 * the specified block with access_ok() before calling this function.
202 *
203 * Returns number of bytes that could not be copied.
204 * On success, this will be zero.
205 */
206static inline unsigned long __must_check
207__copy_to_user(void __user *to, const void *from, unsigned long n)
208{
209 if (__builtin_constant_p(n) && (n <= 256))
210 return uaccess.copy_to_user_small(n, to, from);
211 else
212 return uaccess.copy_to_user(n, to, from);
213}
214
215#define __copy_to_user_inatomic __copy_to_user
216#define __copy_from_user_inatomic __copy_from_user
217
218/**
219 * copy_to_user: - Copy a block of data into user space.
220 * @to: Destination address, in user space.
221 * @from: Source address, in kernel space.
222 * @n: Number of bytes to copy.
223 *
224 * Context: User context only. This function may sleep.
225 *
226 * Copy data from kernel space to user space.
227 *
228 * Returns number of bytes that could not be copied.
229 * On success, this will be zero.
230 */
231static inline unsigned long __must_check
232copy_to_user(void __user *to, const void *from, unsigned long n)
233{
234 might_sleep();
235 if (access_ok(VERIFY_WRITE, to, n))
236 n = __copy_to_user(to, from, n);
237 return n;
238}
239
240/**
241 * __copy_from_user: - Copy a block of data from user space, with less checking.
242 * @to: Destination address, in kernel space.
243 * @from: Source address, in user space.
244 * @n: Number of bytes to copy.
245 *
246 * Context: User context only. This function may sleep.
247 *
248 * Copy data from user space to kernel space. Caller must check
249 * the specified block with access_ok() before calling this function.
250 *
251 * Returns number of bytes that could not be copied.
252 * On success, this will be zero.
253 *
254 * If some data could not be copied, this function will pad the copied
255 * data to the requested size using zero bytes.
256 */
257static inline unsigned long __must_check
258__copy_from_user(void *to, const void __user *from, unsigned long n)
259{
260 if (__builtin_constant_p(n) && (n <= 256))
261 return uaccess.copy_from_user_small(n, from, to);
262 else
263 return uaccess.copy_from_user(n, from, to);
264}
265
266/**
267 * copy_from_user: - Copy a block of data from user space.
268 * @to: Destination address, in kernel space.
269 * @from: Source address, in user space.
270 * @n: Number of bytes to copy.
271 *
272 * Context: User context only. This function may sleep.
273 *
274 * Copy data from user space to kernel space.
275 *
276 * Returns number of bytes that could not be copied.
277 * On success, this will be zero.
278 *
279 * If some data could not be copied, this function will pad the copied
280 * data to the requested size using zero bytes.
281 */
282static inline unsigned long __must_check
283copy_from_user(void *to, const void __user *from, unsigned long n)
284{
285 might_sleep();
286 if (access_ok(VERIFY_READ, from, n))
287 n = __copy_from_user(to, from, n);
288 else
289 memset(to, 0, n);
290 return n;
291}
292
293static inline unsigned long __must_check
294__copy_in_user(void __user *to, const void __user *from, unsigned long n)
295{
296 return uaccess.copy_in_user(n, to, from);
297}
298
299static inline unsigned long __must_check
300copy_in_user(void __user *to, const void __user *from, unsigned long n)
301{
302 might_sleep();
303 if (__access_ok(from,n) && __access_ok(to,n))
304 n = __copy_in_user(to, from, n);
305 return n;
306}
307
308/*
309 * Copy a null terminated string from userspace.
310 */
311static inline long __must_check
312strncpy_from_user(char *dst, const char __user *src, long count)
313{
314 long res = -EFAULT;
315 might_sleep();
316 if (access_ok(VERIFY_READ, src, 1))
317 res = uaccess.strncpy_from_user(count, src, dst);
318 return res;
319}
320
321static inline unsigned long
322strnlen_user(const char __user * src, unsigned long n)
323{
324 might_sleep();
325 return uaccess.strnlen_user(n, src);
326}
327
328/**
329 * strlen_user: - Get the size of a string in user space.
330 * @str: The string to measure.
331 *
332 * Context: User context only. This function may sleep.
333 *
334 * Get the size of a NUL-terminated string in user space.
335 *
336 * Returns the size of the string INCLUDING the terminating NUL.
337 * On exception, returns 0.
338 *
339 * If there is a limit on the length of a valid string, you may wish to
340 * consider using strnlen_user() instead.
341 */
342#define strlen_user(str) strnlen_user(str, ~0UL)
343
344/*
345 * Zero Userspace
346 */
347
348static inline unsigned long __must_check
349__clear_user(void __user *to, unsigned long n)
350{
351 return uaccess.clear_user(n, to);
352}
353
354static inline unsigned long __must_check
355clear_user(void __user *to, unsigned long n)
356{
357 might_sleep();
358 if (access_ok(VERIFY_WRITE, to, n))
359 n = uaccess.clear_user(n, to);
360 return n;
361}
362
363#endif /* __S390_UACCESS_H */
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