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f5e706ad SR |
1 | #ifndef _ASM_UACCESS_H |
2 | #define _ASM_UACCESS_H | |
3 | ||
4 | /* | |
5 | * User space memory access functions | |
6 | */ | |
7 | ||
8 | #ifdef __KERNEL__ | |
fb34035e | 9 | #include <linux/errno.h> |
f5e706ad | 10 | #include <linux/compiler.h> |
f5e706ad | 11 | #include <linux/string.h> |
8abf9196 | 12 | #include <linux/thread_info.h> |
f5e706ad | 13 | #include <asm/asi.h> |
f5e706ad | 14 | #include <asm/spitfire.h> |
5b17e1cd | 15 | #include <asm-generic/uaccess-unaligned.h> |
f5e706ad SR |
16 | #endif |
17 | ||
18 | #ifndef __ASSEMBLY__ | |
19 | ||
2c66f623 DM |
20 | #include <asm/processor.h> |
21 | ||
f5e706ad SR |
22 | /* |
23 | * Sparc64 is segmented, though more like the M68K than the I386. | |
24 | * We use the secondary ASI to address user memory, which references a | |
25 | * completely different VM map, thus there is zero chance of the user | |
26 | * doing something queer and tricking us into poking kernel memory. | |
27 | * | |
28 | * What is left here is basically what is needed for the other parts of | |
29 | * the kernel that expect to be able to manipulate, erum, "segments". | |
30 | * Or perhaps more properly, permissions. | |
31 | * | |
32 | * "For historical reasons, these macros are grossly misnamed." -Linus | |
33 | */ | |
34 | ||
35 | #define KERNEL_DS ((mm_segment_t) { ASI_P }) | |
36 | #define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */ | |
37 | ||
38 | #define VERIFY_READ 0 | |
39 | #define VERIFY_WRITE 1 | |
40 | ||
dff933da | 41 | #define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)}) |
f5e706ad SR |
42 | #define get_ds() (KERNEL_DS) |
43 | ||
44 | #define segment_eq(a,b) ((a).seg == (b).seg) | |
45 | ||
46 | #define set_fs(val) \ | |
47 | do { \ | |
dff933da | 48 | current_thread_info()->current_ds =(val).seg; \ |
f5e706ad SR |
49 | __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \ |
50 | } while(0) | |
51 | ||
52 | static inline int __access_ok(const void __user * addr, unsigned long size) | |
53 | { | |
54 | return 1; | |
55 | } | |
56 | ||
57 | static inline int access_ok(int type, const void __user * addr, unsigned long size) | |
58 | { | |
59 | return 1; | |
60 | } | |
61 | ||
62 | /* | |
63 | * The exception table consists of pairs of addresses: the first is the | |
64 | * address of an instruction that is allowed to fault, and the second is | |
65 | * the address at which the program should continue. No registers are | |
66 | * modified, so it is entirely up to the continuation code to figure out | |
67 | * what to do. | |
68 | * | |
69 | * All the routines below use bits of fixup code that are out of line | |
70 | * with the main instruction path. This means when everything is well, | |
71 | * we don't even have to jump over them. Further, they do not intrude | |
72 | * on our cache or tlb entries. | |
73 | */ | |
74 | ||
75 | struct exception_table_entry { | |
76 | unsigned int insn, fixup; | |
77 | }; | |
78 | ||
f05a6865 SR |
79 | void __ret_efault(void); |
80 | void __retl_efault(void); | |
f5e706ad SR |
81 | |
82 | /* Uh, these should become the main single-value transfer routines.. | |
83 | * They automatically use the right size if we just have the right | |
84 | * pointer type.. | |
85 | * | |
86 | * This gets kind of ugly. We want to return _two_ values in "get_user()" | |
87 | * and yet we don't want to do any pointers, because that is too much | |
88 | * of a performance impact. Thus we have a few rather ugly macros here, | |
89 | * and hide all the ugliness from the user. | |
90 | */ | |
91 | #define put_user(x,ptr) ({ \ | |
92 | unsigned long __pu_addr = (unsigned long)(ptr); \ | |
93 | __chk_user_ptr(ptr); \ | |
94 | __put_user_nocheck((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); }) | |
95 | ||
96 | #define get_user(x,ptr) ({ \ | |
97 | unsigned long __gu_addr = (unsigned long)(ptr); \ | |
98 | __chk_user_ptr(ptr); \ | |
99 | __get_user_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); }) | |
100 | ||
101 | #define __put_user(x,ptr) put_user(x,ptr) | |
102 | #define __get_user(x,ptr) get_user(x,ptr) | |
103 | ||
104 | struct __large_struct { unsigned long buf[100]; }; | |
105 | #define __m(x) ((struct __large_struct *)(x)) | |
106 | ||
107 | #define __put_user_nocheck(data,addr,size) ({ \ | |
108 | register int __pu_ret; \ | |
109 | switch (size) { \ | |
110 | case 1: __put_user_asm(data,b,addr,__pu_ret); break; \ | |
111 | case 2: __put_user_asm(data,h,addr,__pu_ret); break; \ | |
112 | case 4: __put_user_asm(data,w,addr,__pu_ret); break; \ | |
113 | case 8: __put_user_asm(data,x,addr,__pu_ret); break; \ | |
114 | default: __pu_ret = __put_user_bad(); break; \ | |
115 | } __pu_ret; }) | |
116 | ||
117 | #define __put_user_asm(x,size,addr,ret) \ | |
118 | __asm__ __volatile__( \ | |
119 | "/* Put user asm, inline. */\n" \ | |
120 | "1:\t" "st"#size "a %1, [%2] %%asi\n\t" \ | |
121 | "clr %0\n" \ | |
122 | "2:\n\n\t" \ | |
123 | ".section .fixup,#alloc,#execinstr\n\t" \ | |
124 | ".align 4\n" \ | |
125 | "3:\n\t" \ | |
126 | "sethi %%hi(2b), %0\n\t" \ | |
127 | "jmpl %0 + %%lo(2b), %%g0\n\t" \ | |
128 | " mov %3, %0\n\n\t" \ | |
129 | ".previous\n\t" \ | |
130 | ".section __ex_table,\"a\"\n\t" \ | |
131 | ".align 4\n\t" \ | |
132 | ".word 1b, 3b\n\t" \ | |
133 | ".previous\n\n\t" \ | |
134 | : "=r" (ret) : "r" (x), "r" (__m(addr)), \ | |
135 | "i" (-EFAULT)) | |
136 | ||
f05a6865 | 137 | int __put_user_bad(void); |
f5e706ad SR |
138 | |
139 | #define __get_user_nocheck(data,addr,size,type) ({ \ | |
140 | register int __gu_ret; \ | |
141 | register unsigned long __gu_val; \ | |
142 | switch (size) { \ | |
143 | case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \ | |
144 | case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \ | |
145 | case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \ | |
146 | case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \ | |
147 | default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \ | |
148 | } data = (type) __gu_val; __gu_ret; }) | |
149 | ||
150 | #define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \ | |
151 | register unsigned long __gu_val __asm__ ("l1"); \ | |
152 | switch (size) { \ | |
153 | case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \ | |
154 | case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \ | |
155 | case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \ | |
156 | case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \ | |
157 | default: if (__get_user_bad()) return retval; \ | |
158 | } data = (type) __gu_val; }) | |
159 | ||
160 | #define __get_user_asm(x,size,addr,ret) \ | |
161 | __asm__ __volatile__( \ | |
162 | "/* Get user asm, inline. */\n" \ | |
163 | "1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \ | |
164 | "clr %0\n" \ | |
165 | "2:\n\n\t" \ | |
166 | ".section .fixup,#alloc,#execinstr\n\t" \ | |
167 | ".align 4\n" \ | |
168 | "3:\n\t" \ | |
169 | "sethi %%hi(2b), %0\n\t" \ | |
170 | "clr %1\n\t" \ | |
171 | "jmpl %0 + %%lo(2b), %%g0\n\t" \ | |
172 | " mov %3, %0\n\n\t" \ | |
173 | ".previous\n\t" \ | |
174 | ".section __ex_table,\"a\"\n\t" \ | |
175 | ".align 4\n\t" \ | |
176 | ".word 1b, 3b\n\n\t" \ | |
177 | ".previous\n\t" \ | |
178 | : "=r" (ret), "=r" (x) : "r" (__m(addr)), \ | |
179 | "i" (-EFAULT)) | |
180 | ||
181 | #define __get_user_asm_ret(x,size,addr,retval) \ | |
182 | if (__builtin_constant_p(retval) && retval == -EFAULT) \ | |
183 | __asm__ __volatile__( \ | |
184 | "/* Get user asm ret, inline. */\n" \ | |
185 | "1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \ | |
186 | ".section __ex_table,\"a\"\n\t" \ | |
187 | ".align 4\n\t" \ | |
188 | ".word 1b,__ret_efault\n\n\t" \ | |
189 | ".previous\n\t" \ | |
190 | : "=r" (x) : "r" (__m(addr))); \ | |
191 | else \ | |
192 | __asm__ __volatile__( \ | |
193 | "/* Get user asm ret, inline. */\n" \ | |
194 | "1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \ | |
195 | ".section .fixup,#alloc,#execinstr\n\t" \ | |
196 | ".align 4\n" \ | |
197 | "3:\n\t" \ | |
198 | "ret\n\t" \ | |
199 | " restore %%g0, %2, %%o0\n\n\t" \ | |
200 | ".previous\n\t" \ | |
201 | ".section __ex_table,\"a\"\n\t" \ | |
202 | ".align 4\n\t" \ | |
203 | ".word 1b, 3b\n\n\t" \ | |
204 | ".previous\n\t" \ | |
205 | : "=r" (x) : "r" (__m(addr)), "i" (retval)) | |
206 | ||
f05a6865 | 207 | int __get_user_bad(void); |
f5e706ad | 208 | |
f05a6865 SR |
209 | unsigned long __must_check ___copy_from_user(void *to, |
210 | const void __user *from, | |
211 | unsigned long size); | |
212 | unsigned long copy_from_user_fixup(void *to, const void __user *from, | |
213 | unsigned long size); | |
f5e706ad SR |
214 | static inline unsigned long __must_check |
215 | copy_from_user(void *to, const void __user *from, unsigned long size) | |
216 | { | |
4cb6066a DM |
217 | unsigned long ret = ___copy_from_user(to, from, size); |
218 | ||
219 | if (unlikely(ret)) | |
220 | ret = copy_from_user_fixup(to, from, size); | |
221 | ||
f5e706ad SR |
222 | return ret; |
223 | } | |
224 | #define __copy_from_user copy_from_user | |
225 | ||
f05a6865 SR |
226 | unsigned long __must_check ___copy_to_user(void __user *to, |
227 | const void *from, | |
228 | unsigned long size); | |
229 | unsigned long copy_to_user_fixup(void __user *to, const void *from, | |
230 | unsigned long size); | |
f5e706ad SR |
231 | static inline unsigned long __must_check |
232 | copy_to_user(void __user *to, const void *from, unsigned long size) | |
233 | { | |
234 | unsigned long ret = ___copy_to_user(to, from, size); | |
235 | ||
236 | if (unlikely(ret)) | |
237 | ret = copy_to_user_fixup(to, from, size); | |
238 | return ret; | |
239 | } | |
240 | #define __copy_to_user copy_to_user | |
241 | ||
f05a6865 SR |
242 | unsigned long __must_check ___copy_in_user(void __user *to, |
243 | const void __user *from, | |
244 | unsigned long size); | |
245 | unsigned long copy_in_user_fixup(void __user *to, void __user *from, | |
246 | unsigned long size); | |
f5e706ad SR |
247 | static inline unsigned long __must_check |
248 | copy_in_user(void __user *to, void __user *from, unsigned long size) | |
249 | { | |
250 | unsigned long ret = ___copy_in_user(to, from, size); | |
251 | ||
252 | if (unlikely(ret)) | |
253 | ret = copy_in_user_fixup(to, from, size); | |
254 | return ret; | |
255 | } | |
256 | #define __copy_in_user copy_in_user | |
257 | ||
f05a6865 | 258 | unsigned long __must_check __clear_user(void __user *, unsigned long); |
f5e706ad SR |
259 | |
260 | #define clear_user __clear_user | |
261 | ||
f05a6865 SR |
262 | __must_check long strlen_user(const char __user *str); |
263 | __must_check long strnlen_user(const char __user *str, long n); | |
f5e706ad | 264 | |
16932237 DK |
265 | #define __copy_to_user_inatomic __copy_to_user |
266 | #define __copy_from_user_inatomic __copy_from_user | |
f5e706ad | 267 | |
f88620b9 | 268 | struct pt_regs; |
f05a6865 SR |
269 | unsigned long compute_effective_address(struct pt_regs *, |
270 | unsigned int insn, | |
271 | unsigned int rd); | |
f88620b9 | 272 | |
f5e706ad SR |
273 | #endif /* __ASSEMBLY__ */ |
274 | ||
275 | #endif /* _ASM_UACCESS_H */ |