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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
21
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24
25
26
27
28
29#define KERNEL_DS (0)
30#define KERNEL_DS_SACF (1)
31#define USER_DS (2)
32#define USER_DS_SACF (3)
33
34#define get_ds() (KERNEL_DS)
35#define get_fs() (current->thread.mm_segment)
36#define segment_eq(a,b) (((a) & 2) == ((b) & 2))
37
38void set_fs(mm_segment_t fs);
39
40static inline int __range_ok(unsigned long addr, unsigned long size)
41{
42 return 1;
43}
44
45#define __access_ok(addr, size) \
46({ \
47 __chk_user_ptr(addr); \
48 __range_ok((unsigned long)(addr), (size)); \
49})
50
51#define access_ok(type, addr, size) __access_ok(addr, size)
52
53unsigned long __must_check
54raw_copy_from_user(void *to, const void __user *from, unsigned long n);
55
56unsigned long __must_check
57raw_copy_to_user(void __user *to, const void *from, unsigned long n);
58
59#define INLINE_COPY_FROM_USER
60#define INLINE_COPY_TO_USER
61
62#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
63
64#define __put_get_user_asm(to, from, size, spec) \
65({ \
66 register unsigned long __reg0 asm("0") = spec; \
67 int __rc; \
68 \
69 asm volatile( \
70 "0: mvcos %1,%3,%2\n" \
71 "1: xr %0,%0\n" \
72 "2:\n" \
73 ".pushsection .fixup, \"ax\"\n" \
74 "3: lhi %0,%5\n" \
75 " jg 2b\n" \
76 ".popsection\n" \
77 EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
78 : "=d" (__rc), "+Q" (*(to)) \
79 : "d" (size), "Q" (*(from)), \
80 "d" (__reg0), "K" (-EFAULT) \
81 : "cc"); \
82 __rc; \
83})
84
85static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
86{
87 unsigned long spec = 0x010000UL;
88 int rc;
89
90 switch (size) {
91 case 1:
92 rc = __put_get_user_asm((unsigned char __user *)ptr,
93 (unsigned char *)x,
94 size, spec);
95 break;
96 case 2:
97 rc = __put_get_user_asm((unsigned short __user *)ptr,
98 (unsigned short *)x,
99 size, spec);
100 break;
101 case 4:
102 rc = __put_get_user_asm((unsigned int __user *)ptr,
103 (unsigned int *)x,
104 size, spec);
105 break;
106 case 8:
107 rc = __put_get_user_asm((unsigned long __user *)ptr,
108 (unsigned long *)x,
109 size, spec);
110 break;
111 }
112 return rc;
113}
114
115static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
116{
117 unsigned long spec = 0x01UL;
118 int rc;
119
120 switch (size) {
121 case 1:
122 rc = __put_get_user_asm((unsigned char *)x,
123 (unsigned char __user *)ptr,
124 size, spec);
125 break;
126 case 2:
127 rc = __put_get_user_asm((unsigned short *)x,
128 (unsigned short __user *)ptr,
129 size, spec);
130 break;
131 case 4:
132 rc = __put_get_user_asm((unsigned int *)x,
133 (unsigned int __user *)ptr,
134 size, spec);
135 break;
136 case 8:
137 rc = __put_get_user_asm((unsigned long *)x,
138 (unsigned long __user *)ptr,
139 size, spec);
140 break;
141 }
142 return rc;
143}
144
145#else
146
147static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
148{
149 size = raw_copy_to_user(ptr, x, size);
150 return size ? -EFAULT : 0;
151}
152
153static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
154{
155 size = raw_copy_from_user(x, ptr, size);
156 return size ? -EFAULT : 0;
157}
158
159#endif
160
161
162
163
164
165#define __put_user(x, ptr) \
166({ \
167 __typeof__(*(ptr)) __x = (x); \
168 int __pu_err = -EFAULT; \
169 __chk_user_ptr(ptr); \
170 switch (sizeof (*(ptr))) { \
171 case 1: \
172 case 2: \
173 case 4: \
174 case 8: \
175 __pu_err = __put_user_fn(&__x, ptr, \
176 sizeof(*(ptr))); \
177 break; \
178 default: \
179 __put_user_bad(); \
180 break; \
181 } \
182 __builtin_expect(__pu_err, 0); \
183})
184
185#define put_user(x, ptr) \
186({ \
187 might_fault(); \
188 __put_user(x, ptr); \
189})
190
191
192int __put_user_bad(void) __attribute__((noreturn));
193
194#define __get_user(x, ptr) \
195({ \
196 int __gu_err = -EFAULT; \
197 __chk_user_ptr(ptr); \
198 switch (sizeof(*(ptr))) { \
199 case 1: { \
200 unsigned char __x = 0; \
201 __gu_err = __get_user_fn(&__x, ptr, \
202 sizeof(*(ptr))); \
203 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
204 break; \
205 }; \
206 case 2: { \
207 unsigned short __x = 0; \
208 __gu_err = __get_user_fn(&__x, ptr, \
209 sizeof(*(ptr))); \
210 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
211 break; \
212 }; \
213 case 4: { \
214 unsigned int __x = 0; \
215 __gu_err = __get_user_fn(&__x, ptr, \
216 sizeof(*(ptr))); \
217 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
218 break; \
219 }; \
220 case 8: { \
221 unsigned long long __x = 0; \
222 __gu_err = __get_user_fn(&__x, ptr, \
223 sizeof(*(ptr))); \
224 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
225 break; \
226 }; \
227 default: \
228 __get_user_bad(); \
229 break; \
230 } \
231 __builtin_expect(__gu_err, 0); \
232})
233
234#define get_user(x, ptr) \
235({ \
236 might_fault(); \
237 __get_user(x, ptr); \
238})
239
240int __get_user_bad(void) __attribute__((noreturn));
241
242unsigned long __must_check
243raw_copy_in_user(void __user *to, const void __user *from, unsigned long n);
244
245
246
247
248
249long __strncpy_from_user(char *dst, const char __user *src, long count);
250
251static inline long __must_check
252strncpy_from_user(char *dst, const char __user *src, long count)
253{
254 might_fault();
255 return __strncpy_from_user(dst, src, count);
256}
257
258unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
259
260static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
261{
262 might_fault();
263 return __strnlen_user(src, n);
264}
265
266
267
268
269unsigned long __must_check __clear_user(void __user *to, unsigned long size);
270
271static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
272{
273 might_fault();
274 return __clear_user(to, n);
275}
276
277int copy_to_user_real(void __user *dest, void *src, unsigned long count);
278void s390_kernel_write(void *dst, const void *src, size_t size);
279
280#endif
281
