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Linux/arch/openrisc/include/asm/uaccess.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * OpenRISC Linux
  4  *
  5  * Linux architectural port borrowing liberally from similar works of
  6  * others.  All original copyrights apply as per the original source
  7  * declaration.
  8  *
  9  * OpenRISC implementation:
 10  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 11  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 12  * et al.
 13  */
 14 
 15 #ifndef __ASM_OPENRISC_UACCESS_H
 16 #define __ASM_OPENRISC_UACCESS_H
 17 
 18 /*
 19  * User space memory access functions
 20  */
 21 #include <linux/prefetch.h>
 22 #include <linux/string.h>
 23 #include <asm/page.h>
 24 #include <asm/extable.h>
 25 
 26 /*
 27  * The fs value determines whether argument validity checking should be
 28  * performed or not.  If get_fs() == USER_DS, checking is performed, with
 29  * get_fs() == KERNEL_DS, checking is bypassed.
 30  *
 31  * For historical reasons, these macros are grossly misnamed.
 32  */
 33 
 34 /* addr_limit is the maximum accessible address for the task. we misuse
 35  * the KERNEL_DS and USER_DS values to both assign and compare the
 36  * addr_limit values through the equally misnamed get/set_fs macros.
 37  * (see above)
 38  */
 39 
 40 #define KERNEL_DS       (~0UL)
 41 
 42 #define USER_DS         (TASK_SIZE)
 43 #define get_fs()        (current_thread_info()->addr_limit)
 44 #define set_fs(x)       (current_thread_info()->addr_limit = (x))
 45 
 46 #define segment_eq(a, b)        ((a) == (b))
 47 
 48 /* Ensure that the range from addr to addr+size is all within the process'
 49  * address space
 50  */
 51 #define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs()-size))
 52 
 53 /* Ensure that addr is below task's addr_limit */
 54 #define __addr_ok(addr) ((unsigned long) addr < get_fs())
 55 
 56 #define access_ok(addr, size)                                           \
 57 ({                                                                      \
 58         unsigned long __ao_addr = (unsigned long)(addr);                \
 59         unsigned long __ao_size = (unsigned long)(size);                \
 60         __range_ok(__ao_addr, __ao_size);                               \
 61 })
 62 
 63 /*
 64  * These are the main single-value transfer routines.  They automatically
 65  * use the right size if we just have the right pointer type.
 66  *
 67  * This gets kind of ugly. We want to return _two_ values in "get_user()"
 68  * and yet we don't want to do any pointers, because that is too much
 69  * of a performance impact. Thus we have a few rather ugly macros here,
 70  * and hide all the uglyness from the user.
 71  *
 72  * The "__xxx" versions of the user access functions are versions that
 73  * do not verify the address space, that must have been done previously
 74  * with a separate "access_ok()" call (this is used when we do multiple
 75  * accesses to the same area of user memory).
 76  *
 77  * As we use the same address space for kernel and user data on the
 78  * PowerPC, we can just do these as direct assignments.  (Of course, the
 79  * exception handling means that it's no longer "just"...)
 80  */
 81 #define get_user(x, ptr) \
 82         __get_user_check((x), (ptr), sizeof(*(ptr)))
 83 #define put_user(x, ptr) \
 84         __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
 85 
 86 #define __get_user(x, ptr) \
 87         __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
 88 #define __put_user(x, ptr) \
 89         __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
 90 
 91 extern long __put_user_bad(void);
 92 
 93 #define __put_user_nocheck(x, ptr, size)                \
 94 ({                                                      \
 95         long __pu_err;                                  \
 96         __put_user_size((x), (ptr), (size), __pu_err);  \
 97         __pu_err;                                       \
 98 })
 99 
100 #define __put_user_check(x, ptr, size)                                  \
101 ({                                                                      \
102         long __pu_err = -EFAULT;                                        \
103         __typeof__(*(ptr)) *__pu_addr = (ptr);                          \
104         if (access_ok(__pu_addr, size))                 \
105                 __put_user_size((x), __pu_addr, (size), __pu_err);      \
106         __pu_err;                                                       \
107 })
108 
109 #define __put_user_size(x, ptr, size, retval)                           \
110 do {                                                                    \
111         retval = 0;                                                     \
112         switch (size) {                                                 \
113         case 1: __put_user_asm(x, ptr, retval, "l.sb"); break;          \
114         case 2: __put_user_asm(x, ptr, retval, "l.sh"); break;          \
115         case 4: __put_user_asm(x, ptr, retval, "l.sw"); break;          \
116         case 8: __put_user_asm2(x, ptr, retval); break;                 \
117         default: __put_user_bad();                                      \
118         }                                                               \
119 } while (0)
120 
121 struct __large_struct {
122         unsigned long buf[100];
123 };
124 #define __m(x) (*(struct __large_struct *)(x))
125 
126 /*
127  * We don't tell gcc that we are accessing memory, but this is OK
128  * because we do not write to any memory gcc knows about, so there
129  * are no aliasing issues.
130  */
131 #define __put_user_asm(x, addr, err, op)                        \
132         __asm__ __volatile__(                                   \
133                 "1:     "op" 0(%2),%1\n"                        \
134                 "2:\n"                                          \
135                 ".section .fixup,\"ax\"\n"                      \
136                 "3:     l.addi %0,r0,%3\n"                      \
137                 "       l.j 2b\n"                               \
138                 "       l.nop\n"                                \
139                 ".previous\n"                                   \
140                 ".section __ex_table,\"a\"\n"                   \
141                 "       .align 2\n"                             \
142                 "       .long 1b,3b\n"                          \
143                 ".previous"                                     \
144                 : "=r"(err)                                     \
145                 : "r"(x), "r"(addr), "i"(-EFAULT), ""(err))
146 
147 #define __put_user_asm2(x, addr, err)                           \
148         __asm__ __volatile__(                                   \
149                 "1:     l.sw 0(%2),%1\n"                        \
150                 "2:     l.sw 4(%2),%H1\n"                       \
151                 "3:\n"                                          \
152                 ".section .fixup,\"ax\"\n"                      \
153                 "4:     l.addi %0,r0,%3\n"                      \
154                 "       l.j 3b\n"                               \
155                 "       l.nop\n"                                \
156                 ".previous\n"                                   \
157                 ".section __ex_table,\"a\"\n"                   \
158                 "       .align 2\n"                             \
159                 "       .long 1b,4b\n"                          \
160                 "       .long 2b,4b\n"                          \
161                 ".previous"                                     \
162                 : "=r"(err)                                     \
163                 : "r"(x), "r"(addr), "i"(-EFAULT), ""(err))
164 
165 #define __get_user_nocheck(x, ptr, size)                        \
166 ({                                                              \
167         long __gu_err, __gu_val;                                \
168         __get_user_size(__gu_val, (ptr), (size), __gu_err);     \
169         (x) = (__force __typeof__(*(ptr)))__gu_val;             \
170         __gu_err;                                               \
171 })
172 
173 #define __get_user_check(x, ptr, size)                                  \
174 ({                                                                      \
175         long __gu_err = -EFAULT, __gu_val = 0;                          \
176         const __typeof__(*(ptr)) * __gu_addr = (ptr);                   \
177         if (access_ok(__gu_addr, size))                 \
178                 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
179         (x) = (__force __typeof__(*(ptr)))__gu_val;                     \
180         __gu_err;                                                       \
181 })
182 
183 extern long __get_user_bad(void);
184 
185 #define __get_user_size(x, ptr, size, retval)                           \
186 do {                                                                    \
187         retval = 0;                                                     \
188         switch (size) {                                                 \
189         case 1: __get_user_asm(x, ptr, retval, "l.lbz"); break;         \
190         case 2: __get_user_asm(x, ptr, retval, "l.lhz"); break;         \
191         case 4: __get_user_asm(x, ptr, retval, "l.lwz"); break;         \
192         case 8: __get_user_asm2(x, ptr, retval); break;                 \
193         default: (x) = __get_user_bad();                                \
194         }                                                               \
195 } while (0)
196 
197 #define __get_user_asm(x, addr, err, op)                \
198         __asm__ __volatile__(                           \
199                 "1:     "op" %1,0(%2)\n"                \
200                 "2:\n"                                  \
201                 ".section .fixup,\"ax\"\n"              \
202                 "3:     l.addi %0,r0,%3\n"              \
203                 "       l.addi %1,r0,0\n"               \
204                 "       l.j 2b\n"                       \
205                 "       l.nop\n"                        \
206                 ".previous\n"                           \
207                 ".section __ex_table,\"a\"\n"           \
208                 "       .align 2\n"                     \
209                 "       .long 1b,3b\n"                  \
210                 ".previous"                             \
211                 : "=r"(err), "=r"(x)                    \
212                 : "r"(addr), "i"(-EFAULT), ""(err))
213 
214 #define __get_user_asm2(x, addr, err)                   \
215         __asm__ __volatile__(                           \
216                 "1:     l.lwz %1,0(%2)\n"               \
217                 "2:     l.lwz %H1,4(%2)\n"              \
218                 "3:\n"                                  \
219                 ".section .fixup,\"ax\"\n"              \
220                 "4:     l.addi %0,r0,%3\n"              \
221                 "       l.addi %1,r0,0\n"               \
222                 "       l.addi %H1,r0,0\n"              \
223                 "       l.j 3b\n"                       \
224                 "       l.nop\n"                        \
225                 ".previous\n"                           \
226                 ".section __ex_table,\"a\"\n"           \
227                 "       .align 2\n"                     \
228                 "       .long 1b,4b\n"                  \
229                 "       .long 2b,4b\n"                  \
230                 ".previous"                             \
231                 : "=r"(err), "=&r"(x)                   \
232                 : "r"(addr), "i"(-EFAULT), ""(err))
233 
234 /* more complex routines */
235 
236 extern unsigned long __must_check
237 __copy_tofrom_user(void *to, const void *from, unsigned long size);
238 static inline unsigned long
239 raw_copy_from_user(void *to, const void __user *from, unsigned long size)
240 {
241         return __copy_tofrom_user(to, (__force const void *)from, size);
242 }
243 static inline unsigned long
244 raw_copy_to_user(void *to, const void __user *from, unsigned long size)
245 {
246         return __copy_tofrom_user((__force void *)to, from, size);
247 }
248 #define INLINE_COPY_FROM_USER
249 #define INLINE_COPY_TO_USER
250 
251 extern unsigned long __clear_user(void *addr, unsigned long size);
252 
253 static inline __must_check unsigned long
254 clear_user(void *addr, unsigned long size)
255 {
256         if (likely(access_ok(addr, size)))
257                 size = __clear_user(addr, size);
258         return size;
259 }
260 
261 #define user_addr_max() \
262         (uaccess_kernel() ? ~0UL : TASK_SIZE)
263 
264 extern long strncpy_from_user(char *dest, const char __user *src, long count);
265 
266 extern __must_check long strnlen_user(const char __user *str, long n);
267 
268 #endif /* __ASM_OPENRISC_UACCESS_H */
269 

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