1 #ifndef __PARISC_UACCESS_H
2 #define __PARISC_UACCESS_H
5 * User space memory access functions
8 #include <asm/system.h>
10 #include <asm-generic/uaccess.h>
13 #define VERIFY_WRITE 1
15 #define KERNEL_DS ((mm_segment_t){0})
16 #define USER_DS ((mm_segment_t){1})
18 #define segment_eq(a,b) ((a).seg == (b).seg)
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))
25 * Note that since kernel addresses are in a separate address space on
26 * parisc, we don't need to do anything for access_ok().
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.
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);
36 static inline long access_ok(int type, const void __user * addr,
42 #define put_user __put_user
43 #define get_user __get_user
45 #if BITS_PER_LONG == 32
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)
51 #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
52 #define LDD_USER(ptr) __get_user_asm("ldd",ptr)
53 #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
54 #define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
58 * The exception table contains two values: the first is an address
59 * for an instruction that is allowed to fault, and the second is
60 * the address to the fixup routine.
63 struct exception_table_entry {
64 unsigned long insn; /* address of insn that is allowed to fault. */
65 long fixup; /* fixup routine */
69 * The page fault handler stores, in a per-cpu area, the following information
70 * if a fixup routine is available.
72 struct exception_data {
73 unsigned long fault_ip;
74 unsigned long fault_space;
75 unsigned long fault_addr;
78 #define __get_user(x,ptr) \
80 register long __gu_err __asm__ ("r8") = 0; \
81 register long __gu_val __asm__ ("r9") = 0; \
83 if (segment_eq(get_fs(),KERNEL_DS)) { \
84 switch (sizeof(*(ptr))) { \
85 case 1: __get_kernel_asm("ldb",ptr); break; \
86 case 2: __get_kernel_asm("ldh",ptr); break; \
87 case 4: __get_kernel_asm("ldw",ptr); break; \
88 case 8: LDD_KERNEL(ptr); break; \
89 default: __get_kernel_bad(); break; \
93 switch (sizeof(*(ptr))) { \
94 case 1: __get_user_asm("ldb",ptr); break; \
95 case 2: __get_user_asm("ldh",ptr); break; \
96 case 4: __get_user_asm("ldw",ptr); break; \
97 case 8: LDD_USER(ptr); break; \
98 default: __get_user_bad(); break; \
102 (x) = (__typeof__(*(ptr))) __gu_val; \
107 #define __get_kernel_asm(ldx,ptr) \
108 __asm__("\n1:\t" ldx "\t0(%2),%0\n" \
109 "\t.section __ex_table,\"aw\"\n" \
110 "\t.dword\t1b,fixup_get_user_skip_1\n" \
112 : "=r"(__gu_val), "=r"(__gu_err) \
113 : "r"(ptr), "1"(__gu_err) \
116 #define __get_user_asm(ldx,ptr) \
117 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \
118 "\t.section __ex_table,\"aw\"\n" \
119 "\t.dword\t1b,fixup_get_user_skip_1\n" \
121 : "=r"(__gu_val), "=r"(__gu_err) \
122 : "r"(ptr), "1"(__gu_err) \
125 #define __get_kernel_asm(ldx,ptr) \
126 __asm__("\n1:\t" ldx "\t0(%2),%0\n" \
127 "\t.section __ex_table,\"aw\"\n" \
128 "\t.word\t1b,fixup_get_user_skip_1\n" \
130 : "=r"(__gu_val), "=r"(__gu_err) \
131 : "r"(ptr), "1"(__gu_err) \
134 #define __get_user_asm(ldx,ptr) \
135 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \
136 "\t.section __ex_table,\"aw\"\n" \
137 "\t.word\t1b,fixup_get_user_skip_1\n" \
139 : "=r"(__gu_val), "=r"(__gu_err) \
140 : "r"(ptr), "1"(__gu_err) \
142 #endif /* !__LP64__ */
144 #define __put_user(x,ptr) \
146 register long __pu_err __asm__ ("r8") = 0; \
147 __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
149 if (segment_eq(get_fs(),KERNEL_DS)) { \
150 switch (sizeof(*(ptr))) { \
151 case 1: __put_kernel_asm("stb",__x,ptr); break; \
152 case 2: __put_kernel_asm("sth",__x,ptr); break; \
153 case 4: __put_kernel_asm("stw",__x,ptr); break; \
154 case 8: STD_KERNEL(__x,ptr); break; \
155 default: __put_kernel_bad(); break; \
159 switch (sizeof(*(ptr))) { \
160 case 1: __put_user_asm("stb",__x,ptr); break; \
161 case 2: __put_user_asm("sth",__x,ptr); break; \
162 case 4: __put_user_asm("stw",__x,ptr); break; \
163 case 8: STD_USER(__x,ptr); break; \
164 default: __put_user_bad(); break; \
172 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
173 * instead of writing. This is because they do not write to any memory
174 * gcc knows about, so there are no aliasing issues. These macros must
175 * also be aware that "fixup_put_user_skip_[12]" are executed in the
176 * context of the fault, and any registers used there must be listed
177 * as clobbers. In this case only "r1" is used by the current routines.
178 * r8/r9 are already listed as err/val.
182 #define __put_kernel_asm(stx,x,ptr) \
183 __asm__ __volatile__ ( \
184 "\n1:\t" stx "\t%2,0(%1)\n" \
185 "\t.section __ex_table,\"aw\"\n" \
186 "\t.dword\t1b,fixup_put_user_skip_1\n" \
189 : "r"(ptr), "r"(x), "0"(__pu_err) \
192 #define __put_user_asm(stx,x,ptr) \
193 __asm__ __volatile__ ( \
194 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \
195 "\t.section __ex_table,\"aw\"\n" \
196 "\t.dword\t1b,fixup_put_user_skip_1\n" \
199 : "r"(ptr), "r"(x), "0"(__pu_err) \
202 #define __put_kernel_asm(stx,x,ptr) \
203 __asm__ __volatile__ ( \
204 "\n1:\t" stx "\t%2,0(%1)\n" \
205 "\t.section __ex_table,\"aw\"\n" \
206 "\t.word\t1b,fixup_put_user_skip_1\n" \
209 : "r"(ptr), "r"(x), "0"(__pu_err) \
212 #define __put_user_asm(stx,x,ptr) \
213 __asm__ __volatile__ ( \
214 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \
215 "\t.section __ex_table,\"aw\"\n" \
216 "\t.word\t1b,fixup_put_user_skip_1\n" \
219 : "r"(ptr), "r"(x), "0"(__pu_err) \
222 #define __put_kernel_asm64(__val,ptr) do { \
223 u64 __val64 = (u64)(__val); \
224 u32 hi = (__val64) >> 32; \
225 u32 lo = (__val64) & 0xffffffff; \
226 __asm__ __volatile__ ( \
227 "\n1:\tstw %2,0(%1)\n" \
228 "\n2:\tstw %3,4(%1)\n" \
229 "\t.section __ex_table,\"aw\"\n" \
230 "\t.word\t1b,fixup_put_user_skip_2\n" \
231 "\t.word\t2b,fixup_put_user_skip_1\n" \
234 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
238 #define __put_user_asm64(__val,ptr) do { \
239 u64 __val64 = (u64)__val; \
240 u32 hi = (__val64) >> 32; \
241 u32 lo = (__val64) & 0xffffffff; \
242 __asm__ __volatile__ ( \
243 "\n1:\tstw %2,0(%%sr3,%1)\n" \
244 "\n2:\tstw %3,4(%%sr3,%1)\n" \
245 "\t.section __ex_table,\"aw\"\n" \
246 "\t.word\t1b,fixup_get_user_skip_2\n" \
247 "\t.word\t2b,fixup_get_user_skip_1\n" \
250 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
254 #endif /* !__LP64__ */
258 * Complex access routines -- external declarations
261 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
262 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
263 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
264 extern long lstrncpy_from_user(char *, const char __user *, long);
265 extern unsigned lclear_user(void __user *,unsigned long);
266 extern long lstrnlen_user(const char __user *,long);
269 * Complex access routines -- macros
272 #define strncpy_from_user lstrncpy_from_user
273 #define strnlen_user lstrnlen_user
274 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
275 #define clear_user lclear_user
276 #define __clear_user lclear_user
278 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
279 #define __copy_to_user copy_to_user
280 unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len);
281 #define __copy_from_user copy_from_user
282 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
283 #define __copy_in_user copy_in_user
284 #define __copy_to_user_inatomic __copy_to_user
285 #define __copy_from_user_inatomic __copy_from_user
287 #endif /* __PARISC_UACCESS_H */