1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/compiler.h>
#include <linux/string.h>
#include <linux/mm_types.h>
#include <asm/asi.h>
#include <asm/spitfire.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm-generic/access_ok.h>
/*
* Sparc64 is segmented, though more like the M68K than the I386.
* We use the secondary ASI to address user memory, which references a
* completely different VM map, thus there is zero chance of the user
* doing something queer and tricking us into poking kernel memory.
*/
/*
* Test whether a block of memory is a valid user space address.
* Returns 0 if the range is valid, nonzero otherwise.
*/
static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
{
if (__builtin_constant_p(size))
return addr > limit - size;
addr += size;
if (addr < size)
return true;
return addr > limit;
}
#define __range_not_ok(addr, size, limit) \
({ \
__chk_user_ptr(addr); \
__chk_range_not_ok((unsigned long __force)(addr), size, limit); \
})
void __retl_efault(void);
/* Uh, these should become the main single-value transfer routines..
* They automatically use the right size if we just have the right
* pointer type..
*
* This gets kind of ugly. We want to return _two_ values in "get_user()"
* and yet we don't want to do any pointers, because that is too much
* of a performance impact. Thus we have a few rather ugly macros here,
* and hide all the ugliness from the user.
*/
#define put_user(x, ptr) ({ \
unsigned long __pu_addr = (unsigned long)(ptr); \
__chk_user_ptr(ptr); \
__put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
})
#define get_user(x, ptr) ({ \
unsigned long __gu_addr = (unsigned long)(ptr); \
__chk_user_ptr(ptr); \
__get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
})
#define __put_user(x, ptr) put_user(x, ptr)
#define __get_user(x, ptr) get_user(x, ptr)
struct __large_struct { unsigned long buf[100]; };
#define __m(x) ((struct __large_struct *)(x))
#define __put_kernel_nofault(dst, src, type, label) \
do { \
type *addr = (type __force *)(dst); \
type data = *(type *)src; \
register int __pu_ret; \
switch (sizeof(type)) { \
case 1: __put_kernel_asm(data, b, addr, __pu_ret); break; \
case 2: __put_kernel_asm(data, h, addr, __pu_ret); break; \
case 4: __put_kernel_asm(data, w, addr, __pu_ret); break; \
case 8: __put_kernel_asm(data, x, addr, __pu_ret); break; \
default: __pu_ret = __put_user_bad(); break; \
} \
if (__pu_ret) \
goto label; \
} while (0)
#define __put_kernel_asm(x, size, addr, ret) \
__asm__ __volatile__( \
"/* Put kernel asm, inline. */\n" \
"1:\t" "st"#size " %1, [%2]\n\t" \
"clr %0\n" \
"2:\n\n\t" \
".section .fixup,#alloc,#execinstr\n\t" \
".align 4\n" \
"3:\n\t" \
"sethi %%hi(2b), %0\n\t" \
"jmpl %0 + %%lo(2b), %%g0\n\t" \
" mov %3, %0\n\n\t" \
".previous\n\t" \
".section __ex_table,\"a\"\n\t" \
".align 4\n\t" \
".word 1b, 3b\n\t" \
".previous\n\n\t" \
: "=r" (ret) : "r" (x), "r" (__m(addr)), \
"i" (-EFAULT))
#define __put_user_nocheck(data, addr, size) ({ \
register int __pu_ret; \
switch (size) { \
case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
default: __pu_ret = __put_user_bad(); break; \
} \
__pu_ret; \
})
#define __put_user_asm(x, size, addr, ret) \
__asm__ __volatile__( \
"/* Put user asm, inline. */\n" \
"1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
"clr %0\n" \
"2:\n\n\t" \
".section .fixup,#alloc,#execinstr\n\t" \
".align 4\n" \
"3:\n\t" \
"sethi %%hi(2b), %0\n\t" \
"jmpl %0 + %%lo(2b), %%g0\n\t" \
" mov %3, %0\n\n\t" \
".previous\n\t" \
".section __ex_table,\"a\"\n\t" \
".align 4\n\t" \
".word 1b, 3b\n\t" \
".previous\n\n\t" \
: "=r" (ret) : "r" (x), "r" (__m(addr)), \
"i" (-EFAULT))
int __put_user_bad(void);
#define __get_kernel_nofault(dst, src, type, label) \
do { \
type *addr = (type __force *)(src); \
register int __gu_ret; \
register unsigned long __gu_val; \
switch (sizeof(type)) { \
case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break; \
default: \
__gu_val = 0; \
__gu_ret = __get_user_bad(); \
break; \
} \
if (__gu_ret) \
goto label; \
*(type *)dst = (__force type) __gu_val; \
} while (0)
#define __get_kernel_asm(x, size, addr, ret) \
__asm__ __volatile__( \
"/* Get kernel asm, inline. */\n" \
"1:\t" "ld"#size " [%2], %1\n\t" \
"clr %0\n" \
"2:\n\n\t" \
".section .fixup,#alloc,#execinstr\n\t" \
".align 4\n" \
"3:\n\t" \
"sethi %%hi(2b), %0\n\t" \
"clr %1\n\t" \
"jmpl %0 + %%lo(2b), %%g0\n\t" \
" mov %3, %0\n\n\t" \
".previous\n\t" \
".section __ex_table,\"a\"\n\t" \
".align 4\n\t" \
".word 1b, 3b\n\n\t" \
".previous\n\t" \
: "=r" (ret), "=r" (x) : "r" (__m(addr)), \
"i" (-EFAULT))
#define __get_user_nocheck(data, addr, size, type) ({ \
register int __gu_ret; \
register unsigned long __gu_val; \
switch (size) { \
case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break; \
default: \
__gu_val = 0; \
__gu_ret = __get_user_bad(); \
break; \
} \
data = (__force type) __gu_val; \
__gu_ret; \
})
#define __get_user_asm(x, size, addr, ret) \
__asm__ __volatile__( \
"/* Get user asm, inline. */\n" \
"1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
"clr %0\n" \
"2:\n\n\t" \
".section .fixup,#alloc,#execinstr\n\t" \
".align 4\n" \
"3:\n\t" \
"sethi %%hi(2b), %0\n\t" \
"clr %1\n\t" \
"jmpl %0 + %%lo(2b), %%g0\n\t" \
" mov %3, %0\n\n\t" \
".previous\n\t" \
".section __ex_table,\"a\"\n\t" \
".align 4\n\t" \
".word 1b, 3b\n\n\t" \
".previous\n\t" \
: "=r" (ret), "=r" (x) : "r" (__m(addr)), \
"i" (-EFAULT))
int __get_user_bad(void);
unsigned long __must_check raw_copy_from_user(void *to,
const void __user *from,
unsigned long size);
unsigned long __must_check raw_copy_to_user(void __user *to,
const void *from,
unsigned long size);
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
unsigned long __must_check raw_copy_in_user(void __user *to,
const void __user *from,
unsigned long size);
unsigned long __must_check __clear_user(void __user *, unsigned long);
#define clear_user __clear_user
__must_check long strnlen_user(const char __user *str, long n);
struct pt_regs;
unsigned long compute_effective_address(struct pt_regs *,
unsigned int insn,
unsigned int rd);
#endif /* _ASM_UACCESS_H */
|
