summaryrefslogtreecommitdiffstats
path: root/arch/sparc/include/asm/uaccess_32.h
blob: 9fd6c53644b61ec72815aee66722156b9a98777d (plain)
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
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * uaccess.h: User space memore access functions.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H

#include <linux/compiler.h>
#include <linux/string.h>

#include <asm/processor.h>
#include <asm-generic/access_ok.h>

/* 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) ({ \
	void __user *__pu_addr = (ptr); \
	__chk_user_ptr(ptr); \
	__put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \
})

#define get_user(x, ptr) ({ \
	const void __user *__gu_addr = (ptr); \
	__chk_user_ptr(ptr); \
	__get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \
})

/*
 * The "__xxx" versions do not do address space checking, useful when
 * doing multiple accesses to the same area (the user has to do the
 * checks by hand with "access_ok()")
 */
#define __put_user(x, ptr) \
	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
    __get_user_nocheck((x), (ptr), sizeof(*(ptr)), __typeof__(*(ptr)))

struct __large_struct { unsigned long buf[100]; };
#define __m(x) ((struct __large_struct __user *)(x))

#define __put_user_check(x, addr, size) ({ \
	register int __pu_ret; \
	if (__access_ok(addr, size)) { \
		switch (size) { \
		case 1: \
			__put_user_asm(x, b, addr, __pu_ret); \
			break; \
		case 2: \
			__put_user_asm(x, h, addr, __pu_ret); \
			break; \
		case 4: \
			__put_user_asm(x, , addr, __pu_ret); \
			break; \
		case 8: \
			__put_user_asm(x, d, addr, __pu_ret); \
			break; \
		default: \
			__pu_ret = __put_user_bad(); \
			break; \
		} \
	} else { \
		__pu_ret = -EFAULT; \
	} \
	__pu_ret; \
})

#define __put_user_nocheck(x, addr, size) ({			\
	register int __pu_ret;					\
	switch (size) {						\
	case 1: __put_user_asm(x, b, addr, __pu_ret); break;	\
	case 2: __put_user_asm(x, h, addr, __pu_ret); break;	\
	case 4: __put_user_asm(x, , addr, __pu_ret); break;	\
	case 8: __put_user_asm(x, d, 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 " %1, %2\n\t"					\
		"clr	%0\n"						\
	"2:\n\n\t"							\
		".section .fixup,#alloc,#execinstr\n\t"			\
		".align	4\n"						\
	"3:\n\t"							\
		"b	2b\n\t"						\
		" mov	%3, %0\n\t"					\
		".previous\n\n\t"					\
		".section __ex_table,#alloc\n\t"			\
		".align	4\n\t"						\
		".word	1b, 3b\n\t"					\
		".previous\n\n\t"					\
	       : "=&r" (ret) : "r" (x), "m" (*__m(addr)),		\
		 "i" (-EFAULT))

int __put_user_bad(void);

#define __get_user_check(x, addr, size, type) ({ \
	register int __gu_ret; \
	register unsigned long __gu_val; \
	if (__access_ok(addr, size)) { \
		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, , addr, __gu_ret); \
			break; \
		case 8: \
			__get_user_asm(__gu_val, d, addr, __gu_ret); \
			break; \
		default: \
			__gu_val = 0; \
			__gu_ret = __get_user_bad(); \
			break; \
		} \
	 } else { \
		 __gu_val = 0; \
		 __gu_ret = -EFAULT; \
	} \
	x = (__force type) __gu_val; \
	__gu_ret; \
})

#define __get_user_nocheck(x, 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, , addr, __gu_ret); break;	\
	case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break;	\
	default:							\
		__gu_val = 0;						\
		__gu_ret = __get_user_bad();				\
		break;							\
	}								\
	x = (__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 " %2, %1\n\t"					\
		"clr	%0\n"						\
	"2:\n\n\t"							\
		".section .fixup,#alloc,#execinstr\n\t"			\
		".align	4\n"						\
	"3:\n\t"							\
		"clr	%1\n\t"						\
		"b	2b\n\t"						\
		" mov	%3, %0\n\n\t"					\
		".previous\n\t"						\
		".section __ex_table,#alloc\n\t"			\
		".align	4\n\t"						\
		".word	1b, 3b\n\n\t"					\
		".previous\n\t"						\
	       : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)),		\
		 "i" (-EFAULT))

int __get_user_bad(void);

unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size);

static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	return __copy_user(to, (__force void __user *) from, n);
}

static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	return __copy_user((__force void __user *) to, from, n);
}

#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

static inline unsigned long __clear_user(void __user *addr, unsigned long size)
{
	unsigned long ret;

	__asm__ __volatile__ (
		"mov %2, %%o1\n"
		"call __bzero\n\t"
		" mov %1, %%o0\n\t"
		"mov %%o0, %0\n"
		: "=r" (ret) : "r" (addr), "r" (size) :
		"o0", "o1", "o2", "o3", "o4", "o5", "o7",
		"g1", "g2", "g3", "g4", "g5", "g7", "cc");

	return ret;
}

static inline unsigned long clear_user(void __user *addr, unsigned long n)
{
	if (n && __access_ok(addr, n))
		return __clear_user(addr, n);
	else
		return n;
}

__must_check long strnlen_user(const char __user *str, long n);

#endif /* _ASM_UACCESS_H */