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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 | */ | |
1da177e4 LT |
7 | #include <asm/page.h> |
8 | #include <asm/system.h> | |
9 | #include <asm/cache.h> | |
10 | #include <asm-generic/uaccess.h> | |
11 | ||
12 | #define VERIFY_READ 0 | |
13 | #define VERIFY_WRITE 1 | |
14 | ||
15 | #define KERNEL_DS ((mm_segment_t){0}) | |
16 | #define USER_DS ((mm_segment_t){1}) | |
17 | ||
18 | #define segment_eq(a,b) ((a).seg == (b).seg) | |
19 | ||
20 | #define get_ds() (KERNEL_DS) | |
21 | #define get_fs() (current_thread_info()->addr_limit) | |
22 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
23 | ||
24 | /* | |
25 | * Note that since kernel addresses are in a separate address space on | |
e49332bd | 26 | * parisc, we don't need to do anything for access_ok(). |
1da177e4 LT |
27 | * We just let the page fault handler do the right thing. This also means |
28 | * that put_user is the same as __put_user, etc. | |
29 | */ | |
30 | ||
31 | extern int __get_kernel_bad(void); | |
32 | extern int __get_user_bad(void); | |
33 | extern int __put_kernel_bad(void); | |
34 | extern int __put_user_bad(void); | |
35 | ||
36 | static inline long access_ok(int type, const void __user * addr, | |
37 | unsigned long size) | |
38 | { | |
39 | return 1; | |
40 | } | |
41 | ||
1da177e4 LT |
42 | #define put_user __put_user |
43 | #define get_user __get_user | |
44 | ||
ca72a223 | 45 | #if !defined(CONFIG_64BIT) |
1da177e4 LT |
46 | #define LDD_KERNEL(ptr) __get_kernel_bad(); |
47 | #define LDD_USER(ptr) __get_user_bad(); | |
48 | #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) | |
49 | #define STD_USER(x, ptr) __put_user_asm64(x,ptr) | |
94a1981d | 50 | #define ASM_WORD_INSN ".word\t" |
1da177e4 | 51 | #else |
94a1981d HD |
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 | #define ASM_WORD_INSN ".dword\t" | |
1da177e4 LT |
57 | #endif |
58 | ||
59 | /* | |
60 | * The exception table contains two values: the first is an address | |
61 | * for an instruction that is allowed to fault, and the second is | |
62 | * the address to the fixup routine. | |
63 | */ | |
64 | ||
65 | struct exception_table_entry { | |
66 | unsigned long insn; /* address of insn that is allowed to fault. */ | |
67 | long fixup; /* fixup routine */ | |
68 | }; | |
69 | ||
0b3d643f HD |
70 | #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ |
71 | ".section __ex_table,\"aw\"\n" \ | |
72 | ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \ | |
73 | ".previous\n" | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * The page fault handler stores, in a per-cpu area, the following information | |
77 | * if a fixup routine is available. | |
78 | */ | |
79 | struct exception_data { | |
80 | unsigned long fault_ip; | |
81 | unsigned long fault_space; | |
82 | unsigned long fault_addr; | |
83 | }; | |
84 | ||
85 | #define __get_user(x,ptr) \ | |
86 | ({ \ | |
87 | register long __gu_err __asm__ ("r8") = 0; \ | |
88 | register long __gu_val __asm__ ("r9") = 0; \ | |
89 | \ | |
90 | if (segment_eq(get_fs(),KERNEL_DS)) { \ | |
91 | switch (sizeof(*(ptr))) { \ | |
92 | case 1: __get_kernel_asm("ldb",ptr); break; \ | |
93 | case 2: __get_kernel_asm("ldh",ptr); break; \ | |
94 | case 4: __get_kernel_asm("ldw",ptr); break; \ | |
95 | case 8: LDD_KERNEL(ptr); break; \ | |
96 | default: __get_kernel_bad(); break; \ | |
97 | } \ | |
98 | } \ | |
99 | else { \ | |
100 | switch (sizeof(*(ptr))) { \ | |
101 | case 1: __get_user_asm("ldb",ptr); break; \ | |
102 | case 2: __get_user_asm("ldh",ptr); break; \ | |
103 | case 4: __get_user_asm("ldw",ptr); break; \ | |
104 | case 8: LDD_USER(ptr); break; \ | |
105 | default: __get_user_bad(); break; \ | |
106 | } \ | |
107 | } \ | |
108 | \ | |
109 | (x) = (__typeof__(*(ptr))) __gu_val; \ | |
110 | __gu_err; \ | |
111 | }) | |
112 | ||
1da177e4 | 113 | #define __get_kernel_asm(ldx,ptr) \ |
0b3d643f HD |
114 | __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \ |
115 | ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\ | |
1da177e4 LT |
116 | : "=r"(__gu_val), "=r"(__gu_err) \ |
117 | : "r"(ptr), "1"(__gu_err) \ | |
118 | : "r1"); | |
119 | ||
120 | #define __get_user_asm(ldx,ptr) \ | |
0b3d643f HD |
121 | __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \ |
122 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\ | |
1da177e4 LT |
123 | : "=r"(__gu_val), "=r"(__gu_err) \ |
124 | : "r"(ptr), "1"(__gu_err) \ | |
125 | : "r1"); | |
1da177e4 LT |
126 | |
127 | #define __put_user(x,ptr) \ | |
128 | ({ \ | |
129 | register long __pu_err __asm__ ("r8") = 0; \ | |
130 | __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ | |
131 | \ | |
132 | if (segment_eq(get_fs(),KERNEL_DS)) { \ | |
133 | switch (sizeof(*(ptr))) { \ | |
134 | case 1: __put_kernel_asm("stb",__x,ptr); break; \ | |
135 | case 2: __put_kernel_asm("sth",__x,ptr); break; \ | |
136 | case 4: __put_kernel_asm("stw",__x,ptr); break; \ | |
137 | case 8: STD_KERNEL(__x,ptr); break; \ | |
138 | default: __put_kernel_bad(); break; \ | |
139 | } \ | |
140 | } \ | |
141 | else { \ | |
142 | switch (sizeof(*(ptr))) { \ | |
143 | case 1: __put_user_asm("stb",__x,ptr); break; \ | |
144 | case 2: __put_user_asm("sth",__x,ptr); break; \ | |
145 | case 4: __put_user_asm("stw",__x,ptr); break; \ | |
146 | case 8: STD_USER(__x,ptr); break; \ | |
147 | default: __put_user_bad(); break; \ | |
148 | } \ | |
149 | } \ | |
150 | \ | |
151 | __pu_err; \ | |
152 | }) | |
153 | ||
154 | /* | |
155 | * The "__put_user/kernel_asm()" macros tell gcc they read from memory | |
156 | * instead of writing. This is because they do not write to any memory | |
3fd3a74f CD |
157 | * gcc knows about, so there are no aliasing issues. These macros must |
158 | * also be aware that "fixup_put_user_skip_[12]" are executed in the | |
159 | * context of the fault, and any registers used there must be listed | |
160 | * as clobbers. In this case only "r1" is used by the current routines. | |
161 | * r8/r9 are already listed as err/val. | |
1da177e4 LT |
162 | */ |
163 | ||
1da177e4 LT |
164 | #define __put_kernel_asm(stx,x,ptr) \ |
165 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
166 | "\n1:\t" stx "\t%2,0(%1)\n\t" \ |
167 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ | |
1da177e4 | 168 | : "=r"(__pu_err) \ |
3fd3a74f CD |
169 | : "r"(ptr), "r"(x), "0"(__pu_err) \ |
170 | : "r1") | |
1da177e4 LT |
171 | |
172 | #define __put_user_asm(stx,x,ptr) \ | |
173 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
174 | "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \ |
175 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ | |
1da177e4 LT |
176 | : "=r"(__pu_err) \ |
177 | : "r"(ptr), "r"(x), "0"(__pu_err) \ | |
178 | : "r1") | |
179 | ||
1da177e4 | 180 | |
ca72a223 | 181 | #if !defined(CONFIG_64BIT) |
94a1981d HD |
182 | |
183 | #define __put_kernel_asm64(__val,ptr) do { \ | |
184 | u64 __val64 = (u64)(__val); \ | |
185 | u32 hi = (__val64) >> 32; \ | |
186 | u32 lo = (__val64) & 0xffffffff; \ | |
1da177e4 | 187 | __asm__ __volatile__ ( \ |
0b3d643f HD |
188 | "\n1:\tstw %2,0(%1)" \ |
189 | "\n2:\tstw %3,4(%1)\n\t" \ | |
190 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ | |
191 | ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ | |
1da177e4 LT |
192 | : "=r"(__pu_err) \ |
193 | : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ | |
194 | : "r1"); \ | |
195 | } while (0) | |
196 | ||
94a1981d HD |
197 | #define __put_user_asm64(__val,ptr) do { \ |
198 | u64 __val64 = (u64)(__val); \ | |
199 | u32 hi = (__val64) >> 32; \ | |
200 | u32 lo = (__val64) & 0xffffffff; \ | |
1da177e4 | 201 | __asm__ __volatile__ ( \ |
0b3d643f HD |
202 | "\n1:\tstw %2,0(%%sr3,%1)" \ |
203 | "\n2:\tstw %3,4(%%sr3,%1)\n\t" \ | |
204 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ | |
205 | ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ | |
1da177e4 LT |
206 | : "=r"(__pu_err) \ |
207 | : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ | |
208 | : "r1"); \ | |
209 | } while (0) | |
210 | ||
ca72a223 | 211 | #endif /* !defined(CONFIG_64BIT) */ |
1da177e4 LT |
212 | |
213 | ||
214 | /* | |
215 | * Complex access routines -- external declarations | |
216 | */ | |
217 | ||
218 | extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long); | |
219 | extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long); | |
220 | extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long); | |
221 | extern long lstrncpy_from_user(char *, const char __user *, long); | |
222 | extern unsigned lclear_user(void __user *,unsigned long); | |
223 | extern long lstrnlen_user(const char __user *,long); | |
224 | ||
225 | /* | |
226 | * Complex access routines -- macros | |
227 | */ | |
228 | ||
229 | #define strncpy_from_user lstrncpy_from_user | |
230 | #define strnlen_user lstrnlen_user | |
231 | #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL) | |
232 | #define clear_user lclear_user | |
233 | #define __clear_user lclear_user | |
234 | ||
235 | unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len); | |
236 | #define __copy_to_user copy_to_user | |
237 | unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len); | |
238 | #define __copy_from_user copy_from_user | |
239 | unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len); | |
240 | #define __copy_in_user copy_in_user | |
241 | #define __copy_to_user_inatomic __copy_to_user | |
242 | #define __copy_from_user_inatomic __copy_from_user | |
243 | ||
244 | #endif /* __PARISC_UACCESS_H */ |