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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * uaccess.h: User space memore access functions.
4 *
5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8#ifndef _ASM_UACCESS_H
9#define _ASM_UACCESS_H
10
11#include <linux/compiler.h>
12#include <linux/string.h>
13
14#include <asm/processor.h>
15#include <asm-generic/access_ok.h>
16
17/* Uh, these should become the main single-value transfer routines..
18 * They automatically use the right size if we just have the right
19 * pointer type..
20 *
21 * This gets kind of ugly. We want to return _two_ values in "get_user()"
22 * and yet we don't want to do any pointers, because that is too much
23 * of a performance impact. Thus we have a few rather ugly macros here,
24 * and hide all the ugliness from the user.
25 */
26#define put_user(x, ptr) ({ \
27 void __user *__pu_addr = (ptr); \
28 __chk_user_ptr(ptr); \
29 __put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \
30})
31
32#define get_user(x, ptr) ({ \
33 const void __user *__gu_addr = (ptr); \
34 __chk_user_ptr(ptr); \
35 __get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \
36})
37
38/*
39 * The "__xxx" versions do not do address space checking, useful when
40 * doing multiple accesses to the same area (the user has to do the
41 * checks by hand with "access_ok()")
42 */
43#define __put_user(x, ptr) \
44 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
45#define __get_user(x, ptr) \
46 __get_user_nocheck((x), (ptr), sizeof(*(ptr)), __typeof__(*(ptr)))
47
48struct __large_struct { unsigned long buf[100]; };
49#define __m(x) ((struct __large_struct __user *)(x))
50
51#define __put_user_check(x, addr, size) ({ \
52 register int __pu_ret; \
53 if (__access_ok(addr, size)) { \
54 switch (size) { \
55 case 1: \
56 __put_user_asm(x, b, addr, __pu_ret); \
57 break; \
58 case 2: \
59 __put_user_asm(x, h, addr, __pu_ret); \
60 break; \
61 case 4: \
62 __put_user_asm(x, , addr, __pu_ret); \
63 break; \
64 case 8: \
65 __put_user_asm(x, d, addr, __pu_ret); \
66 break; \
67 default: \
68 __pu_ret = __put_user_bad(); \
69 break; \
70 } \
71 } else { \
72 __pu_ret = -EFAULT; \
73 } \
74 __pu_ret; \
75})
76
77#define __put_user_nocheck(x, addr, size) ({ \
78 register int __pu_ret; \
79 switch (size) { \
80 case 1: __put_user_asm(x, b, addr, __pu_ret); break; \
81 case 2: __put_user_asm(x, h, addr, __pu_ret); break; \
82 case 4: __put_user_asm(x, , addr, __pu_ret); break; \
83 case 8: __put_user_asm(x, d, addr, __pu_ret); break; \
84 default: __pu_ret = __put_user_bad(); break; \
85 } \
86 __pu_ret; \
87})
88
89#define __put_user_asm(x, size, addr, ret) \
90__asm__ __volatile__( \
91 "/* Put user asm, inline. */\n" \
92 "1:\t" "st"#size " %1, %2\n\t" \
93 "clr %0\n" \
94 "2:\n\n\t" \
95 ".section .fixup,#alloc,#execinstr\n\t" \
96 ".align 4\n" \
97 "3:\n\t" \
98 "b 2b\n\t" \
99 " mov %3, %0\n\t" \
100 ".previous\n\n\t" \
101 ".section __ex_table,#alloc\n\t" \
102 ".align 4\n\t" \
103 ".word 1b, 3b\n\t" \
104 ".previous\n\n\t" \
105 : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \
106 "i" (-EFAULT))
107
108int __put_user_bad(void);
109
110#define __get_user_check(x, addr, size, type) ({ \
111 register int __gu_ret; \
112 register unsigned long __gu_val; \
113 if (__access_ok(addr, size)) { \
114 switch (size) { \
115 case 1: \
116 __get_user_asm(__gu_val, ub, addr, __gu_ret); \
117 break; \
118 case 2: \
119 __get_user_asm(__gu_val, uh, addr, __gu_ret); \
120 break; \
121 case 4: \
122 __get_user_asm(__gu_val, , addr, __gu_ret); \
123 break; \
124 case 8: \
125 __get_user_asm(__gu_val, d, addr, __gu_ret); \
126 break; \
127 default: \
128 __gu_val = 0; \
129 __gu_ret = __get_user_bad(); \
130 break; \
131 } \
132 } else { \
133 __gu_val = 0; \
134 __gu_ret = -EFAULT; \
135 } \
136 x = (__force type) __gu_val; \
137 __gu_ret; \
138})
139
140#define __get_user_nocheck(x, addr, size, type) ({ \
141 register int __gu_ret; \
142 register unsigned long __gu_val; \
143 switch (size) { \
144 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
145 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
146 case 4: __get_user_asm(__gu_val, , addr, __gu_ret); break; \
147 case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break; \
148 default: \
149 __gu_val = 0; \
150 __gu_ret = __get_user_bad(); \
151 break; \
152 } \
153 x = (__force type) __gu_val; \
154 __gu_ret; \
155})
156
157#define __get_user_asm(x, size, addr, ret) \
158__asm__ __volatile__( \
159 "/* Get user asm, inline. */\n" \
160 "1:\t" "ld"#size " %2, %1\n\t" \
161 "clr %0\n" \
162 "2:\n\n\t" \
163 ".section .fixup,#alloc,#execinstr\n\t" \
164 ".align 4\n" \
165 "3:\n\t" \
166 "clr %1\n\t" \
167 "b 2b\n\t" \
168 " mov %3, %0\n\n\t" \
169 ".previous\n\t" \
170 ".section __ex_table,#alloc\n\t" \
171 ".align 4\n\t" \
172 ".word 1b, 3b\n\n\t" \
173 ".previous\n\t" \
174 : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \
175 "i" (-EFAULT))
176
177int __get_user_bad(void);
178
179unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size);
180
181static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
182{
183 return __copy_user(to, (__force void __user *) from, n);
184}
185
186static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
187{
188 return __copy_user((__force void __user *) to, from, n);
189}
190
191#define INLINE_COPY_FROM_USER
192#define INLINE_COPY_TO_USER
193
194static inline unsigned long __clear_user(void __user *addr, unsigned long size)
195{
196 unsigned long ret;
197
198 __asm__ __volatile__ (
199 "mov %2, %%o1\n"
200 "call __bzero\n\t"
201 " mov %1, %%o0\n\t"
202 "mov %%o0, %0\n"
203 : "=r" (ret) : "r" (addr), "r" (size) :
204 "o0", "o1", "o2", "o3", "o4", "o5", "o7",
205 "g1", "g2", "g3", "g4", "g5", "g7", "cc");
206
207 return ret;
208}
209
210static inline unsigned long clear_user(void __user *addr, unsigned long n)
211{
212 if (n && __access_ok(addr, n))
213 return __clear_user(addr, n);
214 else
215 return n;
216}
217
218__must_check long strnlen_user(const char __user *str, long n);
219
220#endif /* _ASM_UACCESS_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * uaccess.h: User space memore access functions.
4 *
5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8#ifndef _ASM_UACCESS_H
9#define _ASM_UACCESS_H
10
11#include <linux/compiler.h>
12#include <linux/string.h>
13
14#include <asm/processor.h>
15#include <asm-generic/access_ok.h>
16
17/* Uh, these should become the main single-value transfer routines..
18 * They automatically use the right size if we just have the right
19 * pointer type..
20 *
21 * This gets kind of ugly. We want to return _two_ values in "get_user()"
22 * and yet we don't want to do any pointers, because that is too much
23 * of a performance impact. Thus we have a few rather ugly macros here,
24 * and hide all the ugliness from the user.
25 */
26#define put_user(x, ptr) ({ \
27 void __user *__pu_addr = (ptr); \
28 __chk_user_ptr(ptr); \
29 __put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \
30})
31
32#define get_user(x, ptr) ({ \
33 const void __user *__gu_addr = (ptr); \
34 __chk_user_ptr(ptr); \
35 __get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \
36})
37
38/*
39 * The "__xxx" versions do not do address space checking, useful when
40 * doing multiple accesses to the same area (the user has to do the
41 * checks by hand with "access_ok()")
42 */
43#define __put_user(x, ptr) \
44 __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
45#define __get_user(x, ptr) \
46 __get_user_nocheck((x), (ptr), sizeof(*(ptr)), __typeof__(*(ptr)))
47
48struct __large_struct { unsigned long buf[100]; };
49#define __m(x) ((struct __large_struct __user *)(x))
50
51#define __put_user_check(x, addr, size) ({ \
52 register int __pu_ret; \
53 if (__access_ok(addr, size)) { \
54 switch (size) { \
55 case 1: \
56 __put_user_asm(x, b, addr, __pu_ret); \
57 break; \
58 case 2: \
59 __put_user_asm(x, h, addr, __pu_ret); \
60 break; \
61 case 4: \
62 __put_user_asm(x, , addr, __pu_ret); \
63 break; \
64 case 8: \
65 __put_user_asm(x, d, addr, __pu_ret); \
66 break; \
67 default: \
68 __pu_ret = __put_user_bad(); \
69 break; \
70 } \
71 } else { \
72 __pu_ret = -EFAULT; \
73 } \
74 __pu_ret; \
75})
76
77#define __put_user_nocheck(x, addr, size) ({ \
78 register int __pu_ret; \
79 switch (size) { \
80 case 1: __put_user_asm(x, b, addr, __pu_ret); break; \
81 case 2: __put_user_asm(x, h, addr, __pu_ret); break; \
82 case 4: __put_user_asm(x, , addr, __pu_ret); break; \
83 case 8: __put_user_asm(x, d, addr, __pu_ret); break; \
84 default: __pu_ret = __put_user_bad(); break; \
85 } \
86 __pu_ret; \
87})
88
89#define __put_user_asm(x, size, addr, ret) \
90__asm__ __volatile__( \
91 "/* Put user asm, inline. */\n" \
92 "1:\t" "st"#size " %1, %2\n\t" \
93 "clr %0\n" \
94 "2:\n\n\t" \
95 ".section .fixup,#alloc,#execinstr\n\t" \
96 ".align 4\n" \
97 "3:\n\t" \
98 "b 2b\n\t" \
99 " mov %3, %0\n\t" \
100 ".previous\n\n\t" \
101 ".section __ex_table,#alloc\n\t" \
102 ".align 4\n\t" \
103 ".word 1b, 3b\n\t" \
104 ".previous\n\n\t" \
105 : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \
106 "i" (-EFAULT))
107
108int __put_user_bad(void);
109
110#define __get_user_check(x, addr, size, type) ({ \
111 register int __gu_ret; \
112 register unsigned long __gu_val; \
113 if (__access_ok(addr, size)) { \
114 switch (size) { \
115 case 1: \
116 __get_user_asm(__gu_val, ub, addr, __gu_ret); \
117 break; \
118 case 2: \
119 __get_user_asm(__gu_val, uh, addr, __gu_ret); \
120 break; \
121 case 4: \
122 __get_user_asm(__gu_val, , addr, __gu_ret); \
123 break; \
124 case 8: \
125 __get_user_asm(__gu_val, d, addr, __gu_ret); \
126 break; \
127 default: \
128 __gu_val = 0; \
129 __gu_ret = __get_user_bad(); \
130 break; \
131 } \
132 } else { \
133 __gu_val = 0; \
134 __gu_ret = -EFAULT; \
135 } \
136 x = (__force type) __gu_val; \
137 __gu_ret; \
138})
139
140#define __get_user_nocheck(x, addr, size, type) ({ \
141 register int __gu_ret; \
142 register unsigned long __gu_val; \
143 switch (size) { \
144 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
145 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
146 case 4: __get_user_asm(__gu_val, , addr, __gu_ret); break; \
147 case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break; \
148 default: \
149 __gu_val = 0; \
150 __gu_ret = __get_user_bad(); \
151 break; \
152 } \
153 x = (__force type) __gu_val; \
154 __gu_ret; \
155})
156
157#define __get_user_asm(x, size, addr, ret) \
158__asm__ __volatile__( \
159 "/* Get user asm, inline. */\n" \
160 "1:\t" "ld"#size " %2, %1\n\t" \
161 "clr %0\n" \
162 "2:\n\n\t" \
163 ".section .fixup,#alloc,#execinstr\n\t" \
164 ".align 4\n" \
165 "3:\n\t" \
166 "clr %1\n\t" \
167 "b 2b\n\t" \
168 " mov %3, %0\n\n\t" \
169 ".previous\n\t" \
170 ".section __ex_table,#alloc\n\t" \
171 ".align 4\n\t" \
172 ".word 1b, 3b\n\n\t" \
173 ".previous\n\t" \
174 : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \
175 "i" (-EFAULT))
176
177int __get_user_bad(void);
178
179unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size);
180
181static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
182{
183 return __copy_user(to, (__force void __user *) from, n);
184}
185
186static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
187{
188 return __copy_user((__force void __user *) to, from, n);
189}
190
191#define INLINE_COPY_FROM_USER
192#define INLINE_COPY_TO_USER
193
194static inline unsigned long __clear_user(void __user *addr, unsigned long size)
195{
196 unsigned long ret;
197
198 __asm__ __volatile__ (
199 "mov %2, %%o1\n"
200 "call __bzero\n\t"
201 " mov %1, %%o0\n\t"
202 "mov %%o0, %0\n"
203 : "=r" (ret) : "r" (addr), "r" (size) :
204 "o0", "o1", "o2", "o3", "o4", "o5", "o7",
205 "g1", "g2", "g3", "g4", "g5", "g7", "cc");
206
207 return ret;
208}
209
210static inline unsigned long clear_user(void __user *addr, unsigned long n)
211{
212 if (n && __access_ok(addr, n))
213 return __clear_user(addr, n);
214 else
215 return n;
216}
217
218__must_check long strnlen_user(const char __user *str, long n);
219
220#endif /* _ASM_UACCESS_H */