dcdfb89cbf3fff2a32b87fd6bb232c65e7ee3196
[~shefty/rdma-dev.git] / arch / sparc / include / asm / uaccess_64.h
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 #endif
17
18 #ifndef __ASSEMBLY__
19
20 /*
21  * Sparc64 is segmented, though more like the M68K than the I386.
22  * We use the secondary ASI to address user memory, which references a
23  * completely different VM map, thus there is zero chance of the user
24  * doing something queer and tricking us into poking kernel memory.
25  *
26  * What is left here is basically what is needed for the other parts of
27  * the kernel that expect to be able to manipulate, erum, "segments".
28  * Or perhaps more properly, permissions.
29  *
30  * "For historical reasons, these macros are grossly misnamed." -Linus
31  */
32
33 #define KERNEL_DS   ((mm_segment_t) { ASI_P })
34 #define USER_DS     ((mm_segment_t) { ASI_AIUS })       /* har har har */
35
36 #define VERIFY_READ     0
37 #define VERIFY_WRITE    1
38
39 #define get_fs() ((mm_segment_t) { get_thread_current_ds() })
40 #define get_ds() (KERNEL_DS)
41
42 #define segment_eq(a,b)  ((a).seg == (b).seg)
43
44 #define set_fs(val)                                                             \
45 do {                                                                            \
46         set_thread_current_ds((val).seg);                                       \
47         __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));        \
48 } while(0)
49
50 static inline int __access_ok(const void __user * addr, unsigned long size)
51 {
52         return 1;
53 }
54
55 static inline int access_ok(int type, const void __user * addr, unsigned long size)
56 {
57         return 1;
58 }
59
60 /*
61  * The exception table consists of pairs of addresses: the first is the
62  * address of an instruction that is allowed to fault, and the second is
63  * the address at which the program should continue.  No registers are
64  * modified, so it is entirely up to the continuation code to figure out
65  * what to do.
66  *
67  * All the routines below use bits of fixup code that are out of line
68  * with the main instruction path.  This means when everything is well,
69  * we don't even have to jump over them.  Further, they do not intrude
70  * on our cache or tlb entries.
71  */
72
73 struct exception_table_entry {
74         unsigned int insn, fixup;
75 };
76
77 extern void __ret_efault(void);
78 extern void __retl_efault(void);
79
80 /* Uh, these should become the main single-value transfer routines..
81  * They automatically use the right size if we just have the right
82  * pointer type..
83  *
84  * This gets kind of ugly. We want to return _two_ values in "get_user()"
85  * and yet we don't want to do any pointers, because that is too much
86  * of a performance impact. Thus we have a few rather ugly macros here,
87  * and hide all the ugliness from the user.
88  */
89 #define put_user(x,ptr) ({ \
90 unsigned long __pu_addr = (unsigned long)(ptr); \
91 __chk_user_ptr(ptr); \
92 __put_user_nocheck((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
93
94 #define get_user(x,ptr) ({ \
95 unsigned long __gu_addr = (unsigned long)(ptr); \
96 __chk_user_ptr(ptr); \
97 __get_user_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
98
99 #define __put_user(x,ptr) put_user(x,ptr)
100 #define __get_user(x,ptr) get_user(x,ptr)
101
102 struct __large_struct { unsigned long buf[100]; };
103 #define __m(x) ((struct __large_struct *)(x))
104
105 #define __put_user_nocheck(data,addr,size) ({ \
106 register int __pu_ret; \
107 switch (size) { \
108 case 1: __put_user_asm(data,b,addr,__pu_ret); break; \
109 case 2: __put_user_asm(data,h,addr,__pu_ret); break; \
110 case 4: __put_user_asm(data,w,addr,__pu_ret); break; \
111 case 8: __put_user_asm(data,x,addr,__pu_ret); break; \
112 default: __pu_ret = __put_user_bad(); break; \
113 } __pu_ret; })
114
115 #define __put_user_asm(x,size,addr,ret)                                 \
116 __asm__ __volatile__(                                                   \
117         "/* Put user asm, inline. */\n"                                 \
118 "1:\t"  "st"#size "a %1, [%2] %%asi\n\t"                                \
119         "clr    %0\n"                                                   \
120 "2:\n\n\t"                                                              \
121         ".section .fixup,#alloc,#execinstr\n\t"                         \
122         ".align 4\n"                                                    \
123 "3:\n\t"                                                                \
124         "sethi  %%hi(2b), %0\n\t"                                       \
125         "jmpl   %0 + %%lo(2b), %%g0\n\t"                                \
126         " mov   %3, %0\n\n\t"                                           \
127         ".previous\n\t"                                                 \
128         ".section __ex_table,\"a\"\n\t"                                 \
129         ".align 4\n\t"                                                  \
130         ".word  1b, 3b\n\t"                                             \
131         ".previous\n\n\t"                                               \
132        : "=r" (ret) : "r" (x), "r" (__m(addr)),                         \
133          "i" (-EFAULT))
134
135 extern int __put_user_bad(void);
136
137 #define __get_user_nocheck(data,addr,size,type) ({ \
138 register int __gu_ret; \
139 register unsigned long __gu_val; \
140 switch (size) { \
141 case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
142 case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
143 case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
144 case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
145 default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
146 } data = (type) __gu_val; __gu_ret; })
147
148 #define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
149 register unsigned long __gu_val __asm__ ("l1"); \
150 switch (size) { \
151 case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
152 case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
153 case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
154 case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
155 default: if (__get_user_bad()) return retval; \
156 } data = (type) __gu_val; })
157
158 #define __get_user_asm(x,size,addr,ret)                                 \
159 __asm__ __volatile__(                                                   \
160         "/* Get user asm, inline. */\n"                                 \
161 "1:\t"  "ld"#size "a [%2] %%asi, %1\n\t"                                \
162         "clr    %0\n"                                                   \
163 "2:\n\n\t"                                                              \
164         ".section .fixup,#alloc,#execinstr\n\t"                         \
165         ".align 4\n"                                                    \
166 "3:\n\t"                                                                \
167         "sethi  %%hi(2b), %0\n\t"                                       \
168         "clr    %1\n\t"                                                 \
169         "jmpl   %0 + %%lo(2b), %%g0\n\t"                                \
170         " mov   %3, %0\n\n\t"                                           \
171         ".previous\n\t"                                                 \
172         ".section __ex_table,\"a\"\n\t"                                 \
173         ".align 4\n\t"                                                  \
174         ".word  1b, 3b\n\n\t"                                           \
175         ".previous\n\t"                                                 \
176        : "=r" (ret), "=r" (x) : "r" (__m(addr)),                        \
177          "i" (-EFAULT))
178
179 #define __get_user_asm_ret(x,size,addr,retval)                          \
180 if (__builtin_constant_p(retval) && retval == -EFAULT)                  \
181 __asm__ __volatile__(                                                   \
182         "/* Get user asm ret, inline. */\n"                             \
183 "1:\t"  "ld"#size "a [%1] %%asi, %0\n\n\t"                              \
184         ".section __ex_table,\"a\"\n\t"                                 \
185         ".align 4\n\t"                                                  \
186         ".word  1b,__ret_efault\n\n\t"                                  \
187         ".previous\n\t"                                                 \
188        : "=r" (x) : "r" (__m(addr)));                                   \
189 else                                                                    \
190 __asm__ __volatile__(                                                   \
191         "/* Get user asm ret, inline. */\n"                             \
192 "1:\t"  "ld"#size "a [%1] %%asi, %0\n\n\t"                              \
193         ".section .fixup,#alloc,#execinstr\n\t"                         \
194         ".align 4\n"                                                    \
195 "3:\n\t"                                                                \
196         "ret\n\t"                                                       \
197         " restore %%g0, %2, %%o0\n\n\t"                                 \
198         ".previous\n\t"                                                 \
199         ".section __ex_table,\"a\"\n\t"                                 \
200         ".align 4\n\t"                                                  \
201         ".word  1b, 3b\n\n\t"                                           \
202         ".previous\n\t"                                                 \
203        : "=r" (x) : "r" (__m(addr)), "i" (retval))
204
205 extern int __get_user_bad(void);
206
207 extern unsigned long __must_check ___copy_from_user(void *to,
208                                                     const void __user *from,
209                                                     unsigned long size);
210 extern unsigned long copy_from_user_fixup(void *to, const void __user *from,
211                                           unsigned long size);
212 static inline unsigned long __must_check
213 copy_from_user(void *to, const void __user *from, unsigned long size)
214 {
215         unsigned long ret = ___copy_from_user(to, from, size);
216
217         if (unlikely(ret))
218                 ret = copy_from_user_fixup(to, from, size);
219
220         return ret;
221 }
222 #define __copy_from_user copy_from_user
223
224 extern unsigned long __must_check ___copy_to_user(void __user *to,
225                                                   const void *from,
226                                                   unsigned long size);
227 extern unsigned long copy_to_user_fixup(void __user *to, const void *from,
228                                         unsigned long size);
229 static inline unsigned long __must_check
230 copy_to_user(void __user *to, const void *from, unsigned long size)
231 {
232         unsigned long ret = ___copy_to_user(to, from, size);
233
234         if (unlikely(ret))
235                 ret = copy_to_user_fixup(to, from, size);
236         return ret;
237 }
238 #define __copy_to_user copy_to_user
239
240 extern unsigned long __must_check ___copy_in_user(void __user *to,
241                                                   const void __user *from,
242                                                   unsigned long size);
243 extern unsigned long copy_in_user_fixup(void __user *to, void __user *from,
244                                         unsigned long size);
245 static inline unsigned long __must_check
246 copy_in_user(void __user *to, void __user *from, unsigned long size)
247 {
248         unsigned long ret = ___copy_in_user(to, from, size);
249
250         if (unlikely(ret))
251                 ret = copy_in_user_fixup(to, from, size);
252         return ret;
253 }
254 #define __copy_in_user copy_in_user
255
256 extern unsigned long __must_check __clear_user(void __user *, unsigned long);
257
258 #define clear_user __clear_user
259
260 extern long __strlen_user(const char __user *);
261 extern long __strnlen_user(const char __user *, long len);
262
263 #define strlen_user __strlen_user
264 #define strnlen_user __strnlen_user
265 #define __copy_to_user_inatomic ___copy_to_user
266 #define __copy_from_user_inatomic ___copy_from_user
267
268 #endif  /* __ASSEMBLY__ */
269
270 #endif /* _ASM_UACCESS_H */