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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 | 7 | #include <asm/page.h> |
1da177e4 | 8 | #include <asm/cache.h> |
888c31fc | 9 | #include <asm/errno.h> |
5b17e1cd | 10 | #include <asm-generic/uaccess-unaligned.h> |
1da177e4 | 11 | |
8dd95c68 HD |
12 | #include <linux/bug.h> |
13 | ||
1da177e4 LT |
14 | #define VERIFY_READ 0 |
15 | #define VERIFY_WRITE 1 | |
16 | ||
17 | #define KERNEL_DS ((mm_segment_t){0}) | |
18 | #define USER_DS ((mm_segment_t){1}) | |
19 | ||
20 | #define segment_eq(a,b) ((a).seg == (b).seg) | |
21 | ||
22 | #define get_ds() (KERNEL_DS) | |
23 | #define get_fs() (current_thread_info()->addr_limit) | |
24 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
25 | ||
26 | /* | |
27 | * Note that since kernel addresses are in a separate address space on | |
e49332bd | 28 | * parisc, we don't need to do anything for access_ok(). |
1da177e4 LT |
29 | * We just let the page fault handler do the right thing. This also means |
30 | * that put_user is the same as __put_user, etc. | |
31 | */ | |
32 | ||
a0ffa8f0 HD |
33 | static inline long access_ok(int type, const void __user * addr, |
34 | unsigned long size) | |
1da177e4 | 35 | { |
a0ffa8f0 | 36 | return 1; |
1da177e4 LT |
37 | } |
38 | ||
1da177e4 LT |
39 | #define put_user __put_user |
40 | #define get_user __get_user | |
41 | ||
ca72a223 | 42 | #if !defined(CONFIG_64BIT) |
8dd95c68 HD |
43 | #define LDD_KERNEL(ptr) BUILD_BUG() |
44 | #define LDD_USER(ptr) BUILD_BUG() | |
1da177e4 LT |
45 | #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) |
46 | #define STD_USER(x, ptr) __put_user_asm64(x,ptr) | |
94a1981d | 47 | #define ASM_WORD_INSN ".word\t" |
1da177e4 | 48 | #else |
94a1981d HD |
49 | #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr) |
50 | #define LDD_USER(ptr) __get_user_asm("ldd",ptr) | |
51 | #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr) | |
52 | #define STD_USER(x, ptr) __put_user_asm("std",x,ptr) | |
53 | #define ASM_WORD_INSN ".dword\t" | |
1da177e4 LT |
54 | #endif |
55 | ||
56 | /* | |
57 | * The exception table contains two values: the first is an address | |
58 | * for an instruction that is allowed to fault, and the second is | |
61dbbaeb HD |
59 | * the address to the fixup routine. Even on a 64bit kernel we could |
60 | * use a 32bit (unsigned int) address here. | |
1da177e4 LT |
61 | */ |
62 | ||
63 | struct exception_table_entry { | |
61dbbaeb HD |
64 | unsigned long insn; /* address of insn that is allowed to fault. */ |
65 | unsigned long fixup; /* fixup routine */ | |
1da177e4 LT |
66 | }; |
67 | ||
0b3d643f HD |
68 | #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ |
69 | ".section __ex_table,\"aw\"\n" \ | |
70 | ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \ | |
71 | ".previous\n" | |
72 | ||
1da177e4 LT |
73 | /* |
74 | * The page fault handler stores, in a per-cpu area, the following information | |
75 | * if a fixup routine is available. | |
76 | */ | |
77 | struct exception_data { | |
78 | unsigned long fault_ip; | |
79 | unsigned long fault_space; | |
80 | unsigned long fault_addr; | |
81 | }; | |
82 | ||
83 | #define __get_user(x,ptr) \ | |
84 | ({ \ | |
85 | register long __gu_err __asm__ ("r8") = 0; \ | |
86 | register long __gu_val __asm__ ("r9") = 0; \ | |
87 | \ | |
88 | if (segment_eq(get_fs(),KERNEL_DS)) { \ | |
89 | switch (sizeof(*(ptr))) { \ | |
90 | case 1: __get_kernel_asm("ldb",ptr); break; \ | |
91 | case 2: __get_kernel_asm("ldh",ptr); break; \ | |
92 | case 4: __get_kernel_asm("ldw",ptr); break; \ | |
93 | case 8: LDD_KERNEL(ptr); break; \ | |
8dd95c68 | 94 | default: BUILD_BUG(); break; \ |
1da177e4 LT |
95 | } \ |
96 | } \ | |
97 | else { \ | |
98 | switch (sizeof(*(ptr))) { \ | |
99 | case 1: __get_user_asm("ldb",ptr); break; \ | |
100 | case 2: __get_user_asm("ldh",ptr); break; \ | |
101 | case 4: __get_user_asm("ldw",ptr); break; \ | |
102 | case 8: LDD_USER(ptr); break; \ | |
8dd95c68 | 103 | default: BUILD_BUG(); break; \ |
1da177e4 LT |
104 | } \ |
105 | } \ | |
106 | \ | |
876b2a00 | 107 | (x) = (__force __typeof__(*(ptr))) __gu_val; \ |
1da177e4 LT |
108 | __gu_err; \ |
109 | }) | |
110 | ||
1da177e4 | 111 | #define __get_kernel_asm(ldx,ptr) \ |
0b3d643f HD |
112 | __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \ |
113 | ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\ | |
1da177e4 LT |
114 | : "=r"(__gu_val), "=r"(__gu_err) \ |
115 | : "r"(ptr), "1"(__gu_err) \ | |
116 | : "r1"); | |
117 | ||
118 | #define __get_user_asm(ldx,ptr) \ | |
0b3d643f HD |
119 | __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \ |
120 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\ | |
1da177e4 LT |
121 | : "=r"(__gu_val), "=r"(__gu_err) \ |
122 | : "r"(ptr), "1"(__gu_err) \ | |
123 | : "r1"); | |
1da177e4 LT |
124 | |
125 | #define __put_user(x,ptr) \ | |
126 | ({ \ | |
127 | register long __pu_err __asm__ ("r8") = 0; \ | |
128 | __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ | |
129 | \ | |
130 | if (segment_eq(get_fs(),KERNEL_DS)) { \ | |
131 | switch (sizeof(*(ptr))) { \ | |
132 | case 1: __put_kernel_asm("stb",__x,ptr); break; \ | |
133 | case 2: __put_kernel_asm("sth",__x,ptr); break; \ | |
134 | case 4: __put_kernel_asm("stw",__x,ptr); break; \ | |
135 | case 8: STD_KERNEL(__x,ptr); break; \ | |
8dd95c68 | 136 | default: BUILD_BUG(); break; \ |
1da177e4 LT |
137 | } \ |
138 | } \ | |
139 | else { \ | |
140 | switch (sizeof(*(ptr))) { \ | |
141 | case 1: __put_user_asm("stb",__x,ptr); break; \ | |
142 | case 2: __put_user_asm("sth",__x,ptr); break; \ | |
143 | case 4: __put_user_asm("stw",__x,ptr); break; \ | |
144 | case 8: STD_USER(__x,ptr); break; \ | |
8dd95c68 | 145 | default: BUILD_BUG(); break; \ |
1da177e4 LT |
146 | } \ |
147 | } \ | |
148 | \ | |
149 | __pu_err; \ | |
150 | }) | |
151 | ||
152 | /* | |
153 | * The "__put_user/kernel_asm()" macros tell gcc they read from memory | |
154 | * instead of writing. This is because they do not write to any memory | |
3fd3a74f CD |
155 | * gcc knows about, so there are no aliasing issues. These macros must |
156 | * also be aware that "fixup_put_user_skip_[12]" are executed in the | |
157 | * context of the fault, and any registers used there must be listed | |
158 | * as clobbers. In this case only "r1" is used by the current routines. | |
159 | * r8/r9 are already listed as err/val. | |
1da177e4 LT |
160 | */ |
161 | ||
1da177e4 LT |
162 | #define __put_kernel_asm(stx,x,ptr) \ |
163 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
164 | "\n1:\t" stx "\t%2,0(%1)\n\t" \ |
165 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ | |
1da177e4 | 166 | : "=r"(__pu_err) \ |
3fd3a74f CD |
167 | : "r"(ptr), "r"(x), "0"(__pu_err) \ |
168 | : "r1") | |
1da177e4 LT |
169 | |
170 | #define __put_user_asm(stx,x,ptr) \ | |
171 | __asm__ __volatile__ ( \ | |
0b3d643f HD |
172 | "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \ |
173 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ | |
1da177e4 LT |
174 | : "=r"(__pu_err) \ |
175 | : "r"(ptr), "r"(x), "0"(__pu_err) \ | |
176 | : "r1") | |
177 | ||
1da177e4 | 178 | |
ca72a223 | 179 | #if !defined(CONFIG_64BIT) |
94a1981d HD |
180 | |
181 | #define __put_kernel_asm64(__val,ptr) do { \ | |
1da177e4 | 182 | __asm__ __volatile__ ( \ |
0b3d643f | 183 | "\n1:\tstw %2,0(%1)" \ |
0f28b628 | 184 | "\n2:\tstw %R2,4(%1)\n\t" \ |
0b3d643f HD |
185 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ |
186 | ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ | |
1da177e4 | 187 | : "=r"(__pu_err) \ |
0f28b628 | 188 | : "r"(ptr), "r"(__val), "0"(__pu_err) \ |
1da177e4 LT |
189 | : "r1"); \ |
190 | } while (0) | |
191 | ||
94a1981d | 192 | #define __put_user_asm64(__val,ptr) do { \ |
1da177e4 | 193 | __asm__ __volatile__ ( \ |
0b3d643f | 194 | "\n1:\tstw %2,0(%%sr3,%1)" \ |
0f28b628 | 195 | "\n2:\tstw %R2,4(%%sr3,%1)\n\t" \ |
0b3d643f HD |
196 | ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ |
197 | ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ | |
1da177e4 | 198 | : "=r"(__pu_err) \ |
0f28b628 | 199 | : "r"(ptr), "r"(__val), "0"(__pu_err) \ |
1da177e4 LT |
200 | : "r1"); \ |
201 | } while (0) | |
202 | ||
ca72a223 | 203 | #endif /* !defined(CONFIG_64BIT) */ |
1da177e4 LT |
204 | |
205 | ||
206 | /* | |
207 | * Complex access routines -- external declarations | |
208 | */ | |
209 | ||
210 | extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long); | |
211 | extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long); | |
212 | extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long); | |
b1195c0e | 213 | extern long strncpy_from_user(char *, const char __user *, long); |
1da177e4 LT |
214 | extern unsigned lclear_user(void __user *,unsigned long); |
215 | extern long lstrnlen_user(const char __user *,long); | |
1da177e4 LT |
216 | /* |
217 | * Complex access routines -- macros | |
218 | */ | |
a0ffa8f0 | 219 | #define user_addr_max() (~0UL) |
1da177e4 | 220 | |
1da177e4 LT |
221 | #define strnlen_user lstrnlen_user |
222 | #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL) | |
223 | #define clear_user lclear_user | |
224 | #define __clear_user lclear_user | |
225 | ||
226 | unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len); | |
227 | #define __copy_to_user copy_to_user | |
888c31fc | 228 | unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len); |
1da177e4 LT |
229 | unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len); |
230 | #define __copy_in_user copy_in_user | |
231 | #define __copy_to_user_inatomic __copy_to_user | |
232 | #define __copy_from_user_inatomic __copy_from_user | |
233 | ||
888c31fc HD |
234 | extern void copy_from_user_overflow(void) |
235 | #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS | |
236 | __compiletime_error("copy_from_user() buffer size is not provably correct") | |
237 | #else | |
238 | __compiletime_warning("copy_from_user() buffer size is not provably correct") | |
239 | #endif | |
240 | ; | |
241 | ||
242 | static inline unsigned long __must_check copy_from_user(void *to, | |
243 | const void __user *from, | |
244 | unsigned long n) | |
245 | { | |
246 | int sz = __compiletime_object_size(to); | |
247 | int ret = -EFAULT; | |
248 | ||
249 | if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n)) | |
250 | ret = __copy_from_user(to, from, n); | |
251 | else | |
252 | copy_from_user_overflow(); | |
253 | ||
254 | return ret; | |
255 | } | |
256 | ||
e448372c | 257 | struct pt_regs; |
c61c25eb KM |
258 | int fixup_exception(struct pt_regs *regs); |
259 | ||
1da177e4 | 260 | #endif /* __PARISC_UACCESS_H */ |