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1da177e4 LT |
1 | #ifndef __PARISC_UACCESS_H |
2 | #define __PARISC_UACCESS_H | |
3 | ||
4 | /* | |
5 | * User space memory access functions | |
6 | */ | |
7 | #include <linux/sched.h> | |
8 | #include <asm/page.h> | |
9 | #include <asm/system.h> | |
10 | #include <asm/cache.h> | |
11 | #include <asm-generic/uaccess.h> | |
12 | ||
13 | #define VERIFY_READ 0 | |
14 | #define VERIFY_WRITE 1 | |
15 | ||
16 | #define KERNEL_DS ((mm_segment_t){0}) | |
17 | #define USER_DS ((mm_segment_t){1}) | |
18 | ||
19 | #define segment_eq(a,b) ((a).seg == (b).seg) | |
20 | ||
21 | #define get_ds() (KERNEL_DS) | |
22 | #define get_fs() (current_thread_info()->addr_limit) | |
23 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
24 | ||
25 | /* | |
26 | * Note that since kernel addresses are in a separate address space on | |
e49332bd | 27 | * parisc, we don't need to do anything for access_ok(). |
1da177e4 LT |
28 | * We just let the page fault handler do the right thing. This also means |
29 | * that put_user is the same as __put_user, etc. | |
30 | */ | |
31 | ||
32 | extern int __get_kernel_bad(void); | |
33 | extern int __get_user_bad(void); | |
34 | extern int __put_kernel_bad(void); | |
35 | extern int __put_user_bad(void); | |
36 | ||
37 | static inline long access_ok(int type, const void __user * addr, | |
38 | unsigned long size) | |
39 | { | |
40 | return 1; | |
41 | } | |
42 | ||
1da177e4 LT |
43 | #define put_user __put_user |
44 | #define get_user __get_user | |
45 | ||
46 | #if BITS_PER_LONG == 32 | |
47 | #define LDD_KERNEL(ptr) __get_kernel_bad(); | |
48 | #define LDD_USER(ptr) __get_user_bad(); | |
49 | #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) | |
50 | #define STD_USER(x, ptr) __put_user_asm64(x,ptr) | |
51 | #else | |
52 | #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr) | |
53 | #define LDD_USER(ptr) __get_user_asm("ldd",ptr) | |
54 | #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr) | |
55 | #define STD_USER(x, ptr) __put_user_asm("std",x,ptr) | |
56 | #endif | |
57 | ||
58 | /* | |
59 | * The exception table contains two values: the first is an address | |
60 | * for an instruction that is allowed to fault, and the second is | |
61 | * the address to the fixup routine. | |
62 | */ | |
63 | ||
64 | struct exception_table_entry { | |
65 | unsigned long insn; /* address of insn that is allowed to fault. */ | |
66 | long fixup; /* fixup routine */ | |
67 | }; | |
68 | ||
69 | /* | |
70 | * The page fault handler stores, in a per-cpu area, the following information | |
71 | * if a fixup routine is available. | |
72 | */ | |
73 | struct exception_data { | |
74 | unsigned long fault_ip; | |
75 | unsigned long fault_space; | |
76 | unsigned long fault_addr; | |
77 | }; | |
78 | ||
79 | #define __get_user(x,ptr) \ | |
80 | ({ \ | |
81 | register long __gu_err __asm__ ("r8") = 0; \ | |
82 | register long __gu_val __asm__ ("r9") = 0; \ | |
83 | \ | |
84 | if (segment_eq(get_fs(),KERNEL_DS)) { \ | |
85 | switch (sizeof(*(ptr))) { \ | |
86 | case 1: __get_kernel_asm("ldb",ptr); break; \ | |
87 | case 2: __get_kernel_asm("ldh",ptr); break; \ | |
88 | case 4: __get_kernel_asm("ldw",ptr); break; \ | |
89 | case 8: LDD_KERNEL(ptr); break; \ | |
90 | default: __get_kernel_bad(); break; \ | |
91 | } \ | |
92 | } \ | |
93 | else { \ | |
94 | switch (sizeof(*(ptr))) { \ | |
95 | case 1: __get_user_asm("ldb",ptr); break; \ | |
96 | case 2: __get_user_asm("ldh",ptr); break; \ | |
97 | case 4: __get_user_asm("ldw",ptr); break; \ | |
98 | case 8: LDD_USER(ptr); break; \ | |
99 | default: __get_user_bad(); break; \ | |
100 | } \ | |
101 | } \ | |
102 | \ | |
103 | (x) = (__typeof__(*(ptr))) __gu_val; \ | |
104 | __gu_err; \ | |
105 | }) | |
106 | ||
107 | #ifdef __LP64__ | |
108 | #define __get_kernel_asm(ldx,ptr) \ | |
109 | __asm__("\n1:\t" ldx "\t0(%2),%0\n" \ | |
110 | "\t.section __ex_table,\"aw\"\n" \ | |
111 | "\t.dword\t1b,fixup_get_user_skip_1\n" \ | |
112 | "\t.previous" \ | |
113 | : "=r"(__gu_val), "=r"(__gu_err) \ | |
114 | : "r"(ptr), "1"(__gu_err) \ | |
115 | : "r1"); | |
116 | ||
117 | #define __get_user_asm(ldx,ptr) \ | |
118 | __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \ | |
119 | "\t.section __ex_table,\"aw\"\n" \ | |
120 | "\t.dword\t1b,fixup_get_user_skip_1\n" \ | |
121 | "\t.previous" \ | |
122 | : "=r"(__gu_val), "=r"(__gu_err) \ | |
123 | : "r"(ptr), "1"(__gu_err) \ | |
124 | : "r1"); | |
125 | #else | |
126 | #define __get_kernel_asm(ldx,ptr) \ | |
127 | __asm__("\n1:\t" ldx "\t0(%2),%0\n" \ | |
128 | "\t.section __ex_table,\"aw\"\n" \ | |
129 | "\t.word\t1b,fixup_get_user_skip_1\n" \ | |
130 | "\t.previous" \ | |
131 | : "=r"(__gu_val), "=r"(__gu_err) \ | |
132 | : "r"(ptr), "1"(__gu_err) \ | |
133 | : "r1"); | |
134 | ||
135 | #define __get_user_asm(ldx,ptr) \ | |
136 | __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \ | |
137 | "\t.section __ex_table,\"aw\"\n" \ | |
138 | "\t.word\t1b,fixup_get_user_skip_1\n" \ | |
139 | "\t.previous" \ | |
140 | : "=r"(__gu_val), "=r"(__gu_err) \ | |
141 | : "r"(ptr), "1"(__gu_err) \ | |
142 | : "r1"); | |
143 | #endif /* !__LP64__ */ | |
144 | ||
145 | #define __put_user(x,ptr) \ | |
146 | ({ \ | |
147 | register long __pu_err __asm__ ("r8") = 0; \ | |
148 | __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ | |
149 | \ | |
150 | if (segment_eq(get_fs(),KERNEL_DS)) { \ | |
151 | switch (sizeof(*(ptr))) { \ | |
152 | case 1: __put_kernel_asm("stb",__x,ptr); break; \ | |
153 | case 2: __put_kernel_asm("sth",__x,ptr); break; \ | |
154 | case 4: __put_kernel_asm("stw",__x,ptr); break; \ | |
155 | case 8: STD_KERNEL(__x,ptr); break; \ | |
156 | default: __put_kernel_bad(); break; \ | |
157 | } \ | |
158 | } \ | |
159 | else { \ | |
160 | switch (sizeof(*(ptr))) { \ | |
161 | case 1: __put_user_asm("stb",__x,ptr); break; \ | |
162 | case 2: __put_user_asm("sth",__x,ptr); break; \ | |
163 | case 4: __put_user_asm("stw",__x,ptr); break; \ | |
164 | case 8: STD_USER(__x,ptr); break; \ | |
165 | default: __put_user_bad(); break; \ | |
166 | } \ | |
167 | } \ | |
168 | \ | |
169 | __pu_err; \ | |
170 | }) | |
171 | ||
172 | /* | |
173 | * The "__put_user/kernel_asm()" macros tell gcc they read from memory | |
174 | * instead of writing. This is because they do not write to any memory | |
3fd3a74f CD |
175 | * gcc knows about, so there are no aliasing issues. These macros must |
176 | * also be aware that "fixup_put_user_skip_[12]" are executed in the | |
177 | * context of the fault, and any registers used there must be listed | |
178 | * as clobbers. In this case only "r1" is used by the current routines. | |
179 | * r8/r9 are already listed as err/val. | |
1da177e4 LT |
180 | */ |
181 | ||
182 | #ifdef __LP64__ | |
183 | #define __put_kernel_asm(stx,x,ptr) \ | |
184 | __asm__ __volatile__ ( \ | |
185 | "\n1:\t" stx "\t%2,0(%1)\n" \ | |
186 | "\t.section __ex_table,\"aw\"\n" \ | |
187 | "\t.dword\t1b,fixup_put_user_skip_1\n" \ | |
188 | "\t.previous" \ | |
189 | : "=r"(__pu_err) \ | |
3fd3a74f CD |
190 | : "r"(ptr), "r"(x), "0"(__pu_err) \ |
191 | : "r1") | |
1da177e4 LT |
192 | |
193 | #define __put_user_asm(stx,x,ptr) \ | |
194 | __asm__ __volatile__ ( \ | |
195 | "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \ | |
196 | "\t.section __ex_table,\"aw\"\n" \ | |
197 | "\t.dword\t1b,fixup_put_user_skip_1\n" \ | |
198 | "\t.previous" \ | |
199 | : "=r"(__pu_err) \ | |
200 | : "r"(ptr), "r"(x), "0"(__pu_err) \ | |
201 | : "r1") | |
202 | #else | |
203 | #define __put_kernel_asm(stx,x,ptr) \ | |
204 | __asm__ __volatile__ ( \ | |
205 | "\n1:\t" stx "\t%2,0(%1)\n" \ | |
206 | "\t.section __ex_table,\"aw\"\n" \ | |
207 | "\t.word\t1b,fixup_put_user_skip_1\n" \ | |
208 | "\t.previous" \ | |
209 | : "=r"(__pu_err) \ | |
210 | : "r"(ptr), "r"(x), "0"(__pu_err) \ | |
211 | : "r1") | |
212 | ||
213 | #define __put_user_asm(stx,x,ptr) \ | |
214 | __asm__ __volatile__ ( \ | |
215 | "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \ | |
216 | "\t.section __ex_table,\"aw\"\n" \ | |
217 | "\t.word\t1b,fixup_put_user_skip_1\n" \ | |
218 | "\t.previous" \ | |
219 | : "=r"(__pu_err) \ | |
220 | : "r"(ptr), "r"(x), "0"(__pu_err) \ | |
221 | : "r1") | |
222 | ||
223 | #define __put_kernel_asm64(__val,ptr) do { \ | |
224 | u64 __val64 = (u64)(__val); \ | |
225 | u32 hi = (__val64) >> 32; \ | |
226 | u32 lo = (__val64) & 0xffffffff; \ | |
227 | __asm__ __volatile__ ( \ | |
228 | "\n1:\tstw %2,0(%1)\n" \ | |
229 | "\n2:\tstw %3,4(%1)\n" \ | |
230 | "\t.section __ex_table,\"aw\"\n" \ | |
231 | "\t.word\t1b,fixup_put_user_skip_2\n" \ | |
232 | "\t.word\t2b,fixup_put_user_skip_1\n" \ | |
233 | "\t.previous" \ | |
234 | : "=r"(__pu_err) \ | |
235 | : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ | |
236 | : "r1"); \ | |
237 | } while (0) | |
238 | ||
239 | #define __put_user_asm64(__val,ptr) do { \ | |
240 | u64 __val64 = (u64)__val; \ | |
241 | u32 hi = (__val64) >> 32; \ | |
242 | u32 lo = (__val64) & 0xffffffff; \ | |
243 | __asm__ __volatile__ ( \ | |
244 | "\n1:\tstw %2,0(%%sr3,%1)\n" \ | |
245 | "\n2:\tstw %3,4(%%sr3,%1)\n" \ | |
246 | "\t.section __ex_table,\"aw\"\n" \ | |
247 | "\t.word\t1b,fixup_get_user_skip_2\n" \ | |
248 | "\t.word\t2b,fixup_get_user_skip_1\n" \ | |
249 | "\t.previous" \ | |
250 | : "=r"(__pu_err) \ | |
251 | : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ | |
252 | : "r1"); \ | |
253 | } while (0) | |
254 | ||
255 | #endif /* !__LP64__ */ | |
256 | ||
257 | ||
258 | /* | |
259 | * Complex access routines -- external declarations | |
260 | */ | |
261 | ||
262 | extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long); | |
263 | extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long); | |
264 | extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long); | |
265 | extern long lstrncpy_from_user(char *, const char __user *, long); | |
266 | extern unsigned lclear_user(void __user *,unsigned long); | |
267 | extern long lstrnlen_user(const char __user *,long); | |
268 | ||
269 | /* | |
270 | * Complex access routines -- macros | |
271 | */ | |
272 | ||
273 | #define strncpy_from_user lstrncpy_from_user | |
274 | #define strnlen_user lstrnlen_user | |
275 | #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL) | |
276 | #define clear_user lclear_user | |
277 | #define __clear_user lclear_user | |
278 | ||
279 | unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len); | |
280 | #define __copy_to_user copy_to_user | |
281 | unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len); | |
282 | #define __copy_from_user copy_from_user | |
283 | unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len); | |
284 | #define __copy_in_user copy_in_user | |
285 | #define __copy_to_user_inatomic __copy_to_user | |
286 | #define __copy_from_user_inatomic __copy_from_user | |
287 | ||
288 | #endif /* __PARISC_UACCESS_H */ |