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1 /* $Id: uaccess.h,v 1.35 2002/02/09 19:49:31 davem Exp $ */
2 #ifndef _ASM_UACCESS_H
3 #define _ASM_UACCESS_H
4
5 /*
6  * User space memory access functions
7  */
8
9 #ifdef __KERNEL__
10 #include <linux/compiler.h>
11 #include <linux/sched.h>
12 #include <linux/string.h>
13 #include <asm/asi.h>
14 #include <asm/system.h>
15 #include <asm/spitfire.h>
16 #include <asm-generic/uaccess.h>
17 #endif
18
19 #ifndef __ASSEMBLY__
20
21 /*
22  * Sparc64 is segmented, though more like the M68K than the I386. 
23  * We use the secondary ASI to address user memory, which references a
24  * completely different VM map, thus there is zero chance of the user
25  * doing something queer and tricking us into poking kernel memory.
26  *
27  * What is left here is basically what is needed for the other parts of
28  * the kernel that expect to be able to manipulate, erum, "segments".
29  * Or perhaps more properly, permissions.
30  *
31  * "For historical reasons, these macros are grossly misnamed." -Linus
32  */
33
34 #define KERNEL_DS   ((mm_segment_t) { ASI_P })
35 #define USER_DS     ((mm_segment_t) { ASI_AIUS })       /* har har har */
36
37 #define VERIFY_READ     0
38 #define VERIFY_WRITE    1
39
40 #define get_fs() ((mm_segment_t) { get_thread_current_ds() })
41 #define get_ds() (KERNEL_DS)
42
43 #define segment_eq(a,b)  ((a).seg == (b).seg)
44
45 #define set_fs(val)                                                             \
46 do {                                                                            \
47         set_thread_current_ds((val).seg);                                       \
48         __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));        \
49 } while(0)
50
51 static inline int __access_ok(const void __user * addr, unsigned long size)
52 {
53         return 1;
54 }
55
56 static inline int access_ok(int type, const void __user * addr, unsigned long size)
57 {
58         return 1;
59 }
60
61 /*
62  * The exception table consists of pairs of addresses: the first is the
63  * address of an instruction that is allowed to fault, and the second is
64  * the address at which the program should continue.  No registers are
65  * modified, so it is entirely up to the continuation code to figure out
66  * what to do.
67  *
68  * All the routines below use bits of fixup code that are out of line
69  * with the main instruction path.  This means when everything is well,
70  * we don't even have to jump over them.  Further, they do not intrude
71  * on our cache or tlb entries.
72  */
73
74 struct exception_table_entry {
75         unsigned int insn, fixup;
76 };
77
78 extern void __ret_efault(void);
79 extern void __retl_efault(void);
80
81 /* Uh, these should become the main single-value transfer routines..
82  * They automatically use the right size if we just have the right
83  * pointer type..
84  *
85  * This gets kind of ugly. We want to return _two_ values in "get_user()"
86  * and yet we don't want to do any pointers, because that is too much
87  * of a performance impact. Thus we have a few rather ugly macros here,
88  * and hide all the ugliness from the user.
89  */
90 #define put_user(x,ptr) ({ \
91 unsigned long __pu_addr = (unsigned long)(ptr); \
92 __chk_user_ptr(ptr); \
93 __put_user_nocheck((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
94
95 #define get_user(x,ptr) ({ \
96 unsigned long __gu_addr = (unsigned long)(ptr); \
97 __chk_user_ptr(ptr); \
98 __get_user_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
99
100 #define __put_user(x,ptr) put_user(x,ptr)
101 #define __get_user(x,ptr) get_user(x,ptr)
102
103 struct __large_struct { unsigned long buf[100]; };
104 #define __m(x) ((struct __large_struct *)(x))
105
106 #define __put_user_nocheck(data,addr,size) ({ \
107 register int __pu_ret; \
108 switch (size) { \
109 case 1: __put_user_asm(data,b,addr,__pu_ret); break; \
110 case 2: __put_user_asm(data,h,addr,__pu_ret); break; \
111 case 4: __put_user_asm(data,w,addr,__pu_ret); break; \
112 case 8: __put_user_asm(data,x,addr,__pu_ret); break; \
113 default: __pu_ret = __put_user_bad(); break; \
114 } __pu_ret; })
115
116 #define __put_user_asm(x,size,addr,ret)                                 \
117 __asm__ __volatile__(                                                   \
118         "/* Put user asm, inline. */\n"                                 \
119 "1:\t"  "st"#size "a %1, [%2] %%asi\n\t"                                \
120         "clr    %0\n"                                                   \
121 "2:\n\n\t"                                                              \
122         ".section .fixup,#alloc,#execinstr\n\t"                         \
123         ".align 4\n"                                                    \
124 "3:\n\t"                                                                \
125         "sethi  %%hi(2b), %0\n\t"                                       \
126         "jmpl   %0 + %%lo(2b), %%g0\n\t"                                \
127         " mov   %3, %0\n\n\t"                                           \
128         ".previous\n\t"                                                 \
129         ".section __ex_table,\"a\"\n\t"                                 \
130         ".align 4\n\t"                                                  \
131         ".word  1b, 3b\n\t"                                             \
132         ".previous\n\n\t"                                               \
133        : "=r" (ret) : "r" (x), "r" (__m(addr)),                         \
134          "i" (-EFAULT))
135
136 extern int __put_user_bad(void);
137
138 #define __get_user_nocheck(data,addr,size,type) ({ \
139 register int __gu_ret; \
140 register unsigned long __gu_val; \
141 switch (size) { \
142 case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
143 case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
144 case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
145 case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
146 default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
147 } data = (type) __gu_val; __gu_ret; })
148
149 #define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
150 register unsigned long __gu_val __asm__ ("l1"); \
151 switch (size) { \
152 case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
153 case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
154 case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
155 case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
156 default: if (__get_user_bad()) return retval; \
157 } data = (type) __gu_val; })
158
159 #define __get_user_asm(x,size,addr,ret)                                 \
160 __asm__ __volatile__(                                                   \
161         "/* Get user asm, inline. */\n"                                 \
162 "1:\t"  "ld"#size "a [%2] %%asi, %1\n\t"                                \
163         "clr    %0\n"                                                   \
164 "2:\n\n\t"                                                              \
165         ".section .fixup,#alloc,#execinstr\n\t"                         \
166         ".align 4\n"                                                    \
167 "3:\n\t"                                                                \
168         "sethi  %%hi(2b), %0\n\t"                                       \
169         "clr    %1\n\t"                                                 \
170         "jmpl   %0 + %%lo(2b), %%g0\n\t"                                \
171         " mov   %3, %0\n\n\t"                                           \
172         ".previous\n\t"                                                 \
173         ".section __ex_table,\"a\"\n\t"                                 \
174         ".align 4\n\t"                                                  \
175         ".word  1b, 3b\n\n\t"                                           \
176         ".previous\n\t"                                                 \
177        : "=r" (ret), "=r" (x) : "r" (__m(addr)),                        \
178          "i" (-EFAULT))
179
180 #define __get_user_asm_ret(x,size,addr,retval)                          \
181 if (__builtin_constant_p(retval) && retval == -EFAULT)                  \
182 __asm__ __volatile__(                                                   \
183         "/* Get user asm ret, inline. */\n"                             \
184 "1:\t"  "ld"#size "a [%1] %%asi, %0\n\n\t"                              \
185         ".section __ex_table,\"a\"\n\t"                                 \
186         ".align 4\n\t"                                                  \
187         ".word  1b,__ret_efault\n\n\t"                                  \
188         ".previous\n\t"                                                 \
189        : "=r" (x) : "r" (__m(addr)));                                   \
190 else                                                                    \
191 __asm__ __volatile__(                                                   \
192         "/* Get user asm ret, inline. */\n"                             \
193 "1:\t"  "ld"#size "a [%1] %%asi, %0\n\n\t"                              \
194         ".section .fixup,#alloc,#execinstr\n\t"                         \
195         ".align 4\n"                                                    \
196 "3:\n\t"                                                                \
197         "ret\n\t"                                                       \
198         " restore %%g0, %2, %%o0\n\n\t"                                 \
199         ".previous\n\t"                                                 \
200         ".section __ex_table,\"a\"\n\t"                                 \
201         ".align 4\n\t"                                                  \
202         ".word  1b, 3b\n\n\t"                                           \
203         ".previous\n\t"                                                 \
204        : "=r" (x) : "r" (__m(addr)), "i" (retval))
205
206 extern int __get_user_bad(void);
207
208 extern unsigned long __must_check ___copy_from_user(void *to,
209                                                     const void __user *from,
210                                                     unsigned long size);
211 extern unsigned long copy_from_user_fixup(void *to, const void __user *from,
212                                           unsigned long size);
213 static inline unsigned long __must_check
214 copy_from_user(void *to, const void __user *from, unsigned long size)
215 {
216         unsigned long ret = ___copy_from_user(to, from, size);
217
218         if (unlikely(ret))
219                 ret = copy_from_user_fixup(to, from, size);
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 __must_check __strncpy_from_user(char *dest, const char __user *src, long count);
261
262 #define strncpy_from_user __strncpy_from_user
263
264 extern long __strlen_user(const char __user *);
265 extern long __strnlen_user(const char __user *, long len);
266
267 #define strlen_user __strlen_user
268 #define strnlen_user __strnlen_user
269 #define __copy_to_user_inatomic __copy_to_user
270 #define __copy_from_user_inatomic __copy_from_user
271
272 #endif  /* __ASSEMBLY__ */
273
274 #endif /* _ASM_UACCESS_H */