1 #ifndef _ASM_UACCESS_H
2 #define _ASM_UACCESS_H
3
4 /*
5 * User space memory access functions
6 */
7
8 #ifdef __KERNEL__
9 #include <linux/errno.h>
10 #include <linux/compiler.h>
11 #include <linux/string.h>
12 #include <linux/thread_info.h>
13 #include <asm/asi.h>
14 #include <asm/spitfire.h>
15 #include <asm-generic/uaccess-unaligned.h>
16 #include <asm/extable_64.h>
17 #endif
18
19 #ifndef __ASSEMBLY__
20
21 #include <asm/processor.h>
22
23 /*
24 * Sparc64 is segmented, though more like the M68K than the I386.
25 * We use the secondary ASI to address user memory, which references a
26 * completely different VM map, thus there is zero chance of the user
27 * doing something queer and tricking us into poking kernel memory.
28 *
29 * What is left here is basically what is needed for the other parts of
30 * the kernel that expect to be able to manipulate, erum, "segments".
31 * Or perhaps more properly, permissions.
32 *
33 * "For historical reasons, these macros are grossly misnamed." -Linus
34 */
35
36 #define KERNEL_DS ((mm_segment_t) { ASI_P })
37 #define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */
38
39 #define VERIFY_READ 0
40 #define VERIFY_WRITE 1
41
42 #define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
43 #define get_ds() (KERNEL_DS)
44
45 #define segment_eq(a, b) ((a).seg == (b).seg)
46
47 #define set_fs(val) \
48 do { \
49 current_thread_info()->current_ds = (val).seg; \
50 __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \
51 } while(0)
52
53 /*
54 * Test whether a block of memory is a valid user space address.
55 * Returns 0 if the range is valid, nonzero otherwise.
56 */
__chk_range_not_ok(unsigned long addr,unsigned long size,unsigned long limit)57 static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
58 {
59 if (__builtin_constant_p(size))
60 return addr > limit - size;
61
62 addr += size;
63 if (addr < size)
64 return true;
65
66 return addr > limit;
67 }
68
69 #define __range_not_ok(addr, size, limit) \
70 ({ \
71 __chk_user_ptr(addr); \
72 __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
73 })
74
__access_ok(const void __user * addr,unsigned long size)75 static inline int __access_ok(const void __user * addr, unsigned long size)
76 {
77 return 1;
78 }
79
access_ok(int type,const void __user * addr,unsigned long size)80 static inline int access_ok(int type, const void __user * addr, unsigned long size)
81 {
82 return 1;
83 }
84
85 void __retl_efault(void);
86
87 /* Uh, these should become the main single-value transfer routines..
88 * They automatically use the right size if we just have the right
89 * pointer type..
90 *
91 * This gets kind of ugly. We want to return _two_ values in "get_user()"
92 * and yet we don't want to do any pointers, because that is too much
93 * of a performance impact. Thus we have a few rather ugly macros here,
94 * and hide all the ugliness from the user.
95 */
96 #define put_user(x, ptr) ({ \
97 unsigned long __pu_addr = (unsigned long)(ptr); \
98 __chk_user_ptr(ptr); \
99 __put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
100 })
101
102 #define get_user(x, ptr) ({ \
103 unsigned long __gu_addr = (unsigned long)(ptr); \
104 __chk_user_ptr(ptr); \
105 __get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
106 })
107
108 #define __put_user(x, ptr) put_user(x, ptr)
109 #define __get_user(x, ptr) get_user(x, ptr)
110
111 struct __large_struct { unsigned long buf[100]; };
112 #define __m(x) ((struct __large_struct *)(x))
113
114 #define __put_user_nocheck(data, addr, size) ({ \
115 register int __pu_ret; \
116 switch (size) { \
117 case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
118 case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
119 case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
120 case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
121 default: __pu_ret = __put_user_bad(); break; \
122 } \
123 __pu_ret; \
124 })
125
126 #define __put_user_asm(x, size, addr, ret) \
127 __asm__ __volatile__( \
128 "/* Put user asm, inline. */\n" \
129 "1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
130 "clr %0\n" \
131 "2:\n\n\t" \
132 ".section .fixup,#alloc,#execinstr\n\t" \
133 ".align 4\n" \
134 "3:\n\t" \
135 "sethi %%hi(2b), %0\n\t" \
136 "jmpl %0 + %%lo(2b), %%g0\n\t" \
137 " mov %3, %0\n\n\t" \
138 ".previous\n\t" \
139 ".section __ex_table,\"a\"\n\t" \
140 ".align 4\n\t" \
141 ".word 1b, 3b\n\t" \
142 ".previous\n\n\t" \
143 : "=r" (ret) : "r" (x), "r" (__m(addr)), \
144 "i" (-EFAULT))
145
146 int __put_user_bad(void);
147
148 #define __get_user_nocheck(data, addr, size, type) ({ \
149 register int __gu_ret; \
150 register unsigned long __gu_val; \
151 switch (size) { \
152 case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
153 case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
154 case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
155 case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break; \
156 default: \
157 __gu_val = 0; \
158 __gu_ret = __get_user_bad(); \
159 break; \
160 } \
161 data = (__force type) __gu_val; \
162 __gu_ret; \
163 })
164
165 #define __get_user_asm(x, size, addr, ret) \
166 __asm__ __volatile__( \
167 "/* Get user asm, inline. */\n" \
168 "1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
169 "clr %0\n" \
170 "2:\n\n\t" \
171 ".section .fixup,#alloc,#execinstr\n\t" \
172 ".align 4\n" \
173 "3:\n\t" \
174 "sethi %%hi(2b), %0\n\t" \
175 "clr %1\n\t" \
176 "jmpl %0 + %%lo(2b), %%g0\n\t" \
177 " mov %3, %0\n\n\t" \
178 ".previous\n\t" \
179 ".section __ex_table,\"a\"\n\t" \
180 ".align 4\n\t" \
181 ".word 1b, 3b\n\n\t" \
182 ".previous\n\t" \
183 : "=r" (ret), "=r" (x) : "r" (__m(addr)), \
184 "i" (-EFAULT))
185
186 int __get_user_bad(void);
187
188 unsigned long __must_check ___copy_from_user(void *to,
189 const void __user *from,
190 unsigned long size);
191 static inline unsigned long __must_check
copy_from_user(void * to,const void __user * from,unsigned long size)192 copy_from_user(void *to, const void __user *from, unsigned long size)
193 {
194 check_object_size(to, size, false);
195
196 return ___copy_from_user(to, from, size);
197 }
198 #define __copy_from_user copy_from_user
199
200 unsigned long __must_check ___copy_to_user(void __user *to,
201 const void *from,
202 unsigned long size);
203 static inline unsigned long __must_check
copy_to_user(void __user * to,const void * from,unsigned long size)204 copy_to_user(void __user *to, const void *from, unsigned long size)
205 {
206 check_object_size(from, size, true);
207
208 return ___copy_to_user(to, from, size);
209 }
210 #define __copy_to_user copy_to_user
211
212 unsigned long __must_check ___copy_in_user(void __user *to,
213 const void __user *from,
214 unsigned long size);
215 static inline unsigned long __must_check
copy_in_user(void __user * to,void __user * from,unsigned long size)216 copy_in_user(void __user *to, void __user *from, unsigned long size)
217 {
218 return ___copy_in_user(to, from, size);
219 }
220 #define __copy_in_user copy_in_user
221
222 unsigned long __must_check __clear_user(void __user *, unsigned long);
223
224 #define clear_user __clear_user
225
226 __must_check long strlen_user(const char __user *str);
227 __must_check long strnlen_user(const char __user *str, long n);
228
229 #define __copy_to_user_inatomic __copy_to_user
230 #define __copy_from_user_inatomic __copy_from_user
231
232 struct pt_regs;
233 unsigned long compute_effective_address(struct pt_regs *,
234 unsigned int insn,
235 unsigned int rd);
236
237 #endif /* __ASSEMBLY__ */
238
239 #endif /* _ASM_UACCESS_H */
240