aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/include/asm/uaccess_64.h
blob: ad7e178337f12f2f753f66ec2a9c26dae65c9f68 (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
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
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H

/*
 * User space memory access functions
 */

#ifdef __KERNEL__
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/string.h>
#include <linux/thread_info.h>
#include <asm/asi.h>
#include <asm/spitfire.h>
#include <asm-generic/uaccess-unaligned.h>
#endif

#ifndef __ASSEMBLY__

#include <asm/processor.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.
 *
 * What is left here is basically what is needed for the other parts of
 * the kernel that expect to be able to manipulate, erum, "segments".
 * Or perhaps more properly, permissions.
 *
 * "For historical reasons, these macros are grossly misnamed." -Linus
 */

#define KERNEL_DS   ((mm_segment_t) { ASI_P })
#define USER_DS     ((mm_segment_t) { ASI_AIUS })	/* har har har */

#define VERIFY_READ	0
#define VERIFY_WRITE	1

#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
#define get_ds() (KERNEL_DS)

#define segment_eq(a,b)  ((a).seg == (b).seg)

#define set_fs(val)								\
do {										\
	current_thread_info()->current_ds =(val).seg;				\
	__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));	\
} while(0)

static inline int __access_ok(const void __user * addr, unsigned long size)
{
	return 1;
}

static inline int access_ok(int type, const void __user * addr, unsigned long size)
{
	return 1;
}

/*
 * The exception table consists of pairs of addresses: the first is the
 * address of an instruction that is allowed to fault, and the second is
 * the address at which the program should continue.  No registers are
 * modified, so it is entirely up to the continuation code to figure out
 * what to do.
 *
 * All the routines below use bits of fixup code that are out of line
 * with the main instruction path.  This means when everything is well,
 * we don't even have to jump over them.  Further, they do not intrude
 * on our cache or tlb entries.
 */

struct exception_table_entry {
        unsigned int insn, fixup;
};

extern void __ret_efault(void);
extern 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_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))

extern int __put_user_bad(void);

#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 = (type) __gu_val; __gu_ret; })

#define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
register unsigned long __gu_val __asm__ ("l1"); \
switch (size) { \
case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
default: if (__get_user_bad()) return retval; \
} data = (type) __gu_val; })

#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))

#define __get_user_asm_ret(x,size,addr,retval)				\
if (__builtin_constant_p(retval) && retval == -EFAULT)			\
__asm__ __volatile__(							\
	"/* Get user asm ret, inline. */\n"				\
"1:\t"	"ld"#size "a [%1] %%asi, %0\n\n\t"				\
	".section __ex_table,\"a\"\n\t"					\
	".align	4\n\t"							\
	".word	1b,__ret_efault\n\n\t"					\
	".previous\n\t"							\
       : "=r" (x) : "r" (__m(addr)));					\
else									\
__asm__ __volatile__(							\
	"/* Get user asm ret, inline. */\n"				\
"1:\t"	"ld"#size "a [%1] %%asi, %0\n\n\t"				\
	".section .fixup,#alloc,#execinstr\n\t"				\
	".align	4\n"							\
"3:\n\t"								\
	"ret\n\t"							\
	" restore %%g0, %2, %%o0\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" (x) : "r" (__m(addr)), "i" (retval))

extern int __get_user_bad(void);

extern unsigned long __must_check ___copy_from_user(void *to,
						    const void __user *from,
						    unsigned long size);
extern unsigned long copy_from_user_fixup(void *to, const void __user *from,
					  unsigned long size);
static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long size)
{
	unsigned long ret = ___copy_from_user(to, from, size);

	if (unlikely(ret))
		ret = copy_from_user_fixup(to, from, size);

	return ret;
}
#define __copy_from_user copy_from_user

extern unsigned long __must_check ___copy_to_user(void __user *to,
						  const void *from,
						  unsigned long size);
extern unsigned long copy_to_user_fixup(void __user *to, const void *from,
					unsigned long size);
static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long size)
{
	unsigned long ret = ___copy_to_user(to, from, size);

	if (unlikely(ret))
		ret = copy_to_user_fixup(to, from, size);
	return ret;
}
#define __copy_to_user copy_to_user

extern unsigned long __must_check ___copy_in_user(void __user *to,
						  const void __user *from,
						  unsigned long size);
extern unsigned long copy_in_user_fixup(void __user *to, void __user *from,
					unsigned long size);
static inline unsigned long __must_check
copy_in_user(void __user *to, void __user *from, unsigned long size)
{
	unsigned long ret = ___copy_in_user(to, from, size);

	if (unlikely(ret))
		ret = copy_in_user_fixup(to, from, size);
	return ret;
}
#define __copy_in_user copy_in_user

extern unsigned long __must_check __clear_user(void __user *, unsigned long);

#define clear_user __clear_user

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

#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user

struct pt_regs;
extern unsigned long compute_effective_address(struct pt_regs *,
					       unsigned int insn,
					       unsigned int rd);

#endif  /* __ASSEMBLY__ */

#endif /* _ASM_UACCESS_H */