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 !defined(CONFIG_64BIT)
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)
50 #define ASM_WORD_INSN ".word\t"
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"
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.
65 struct exception_table_entry {
66 unsigned long insn; /* address of insn that is allowed to fault. */
67 long fixup; /* fixup routine */
71 * The page fault handler stores, in a per-cpu area, the following information
72 * if a fixup routine is available.
74 struct exception_data {
75 unsigned long fault_ip;
76 unsigned long fault_space;
77 unsigned long fault_addr;
80 #define __get_user(x,ptr) \
82 register long __gu_err __asm__ ("r8") = 0; \
83 register long __gu_val __asm__ ("r9") = 0; \
85 if (segment_eq(get_fs(),KERNEL_DS)) { \
86 switch (sizeof(*(ptr))) { \
87 case 1: __get_kernel_asm("ldb",ptr); break; \
88 case 2: __get_kernel_asm("ldh",ptr); break; \
89 case 4: __get_kernel_asm("ldw",ptr); break; \
90 case 8: LDD_KERNEL(ptr); break; \
91 default: __get_kernel_bad(); break; \
95 switch (sizeof(*(ptr))) { \
96 case 1: __get_user_asm("ldb",ptr); break; \
97 case 2: __get_user_asm("ldh",ptr); break; \
98 case 4: __get_user_asm("ldw",ptr); break; \
99 case 8: LDD_USER(ptr); break; \
100 default: __get_user_bad(); break; \
104 (x) = (__typeof__(*(ptr))) __gu_val; \
108 #define __get_kernel_asm(ldx,ptr) \
109 __asm__("\n1:\t" ldx "\t0(%2),%0\n" \
110 "\t.section __ex_table,\"aw\"\n" \
112 "1b,fixup_get_user_skip_1\n" \
114 : "=r"(__gu_val), "=r"(__gu_err) \
115 : "r"(ptr), "1"(__gu_err) \
118 #define __get_user_asm(ldx,ptr) \
119 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \
120 "\t.section __ex_table,\"aw\"\n" \
122 "1b,fixup_get_user_skip_1\n" \
124 : "=r"(__gu_val), "=r"(__gu_err) \
125 : "r"(ptr), "1"(__gu_err) \
128 #define __put_user(x,ptr) \
130 register long __pu_err __asm__ ("r8") = 0; \
131 __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
133 if (segment_eq(get_fs(),KERNEL_DS)) { \
134 switch (sizeof(*(ptr))) { \
135 case 1: __put_kernel_asm("stb",__x,ptr); break; \
136 case 2: __put_kernel_asm("sth",__x,ptr); break; \
137 case 4: __put_kernel_asm("stw",__x,ptr); break; \
138 case 8: STD_KERNEL(__x,ptr); break; \
139 default: __put_kernel_bad(); break; \
143 switch (sizeof(*(ptr))) { \
144 case 1: __put_user_asm("stb",__x,ptr); break; \
145 case 2: __put_user_asm("sth",__x,ptr); break; \
146 case 4: __put_user_asm("stw",__x,ptr); break; \
147 case 8: STD_USER(__x,ptr); break; \
148 default: __put_user_bad(); break; \
156 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
157 * instead of writing. This is because they do not write to any memory
158 * gcc knows about, so there are no aliasing issues. These macros must
159 * also be aware that "fixup_put_user_skip_[12]" are executed in the
160 * context of the fault, and any registers used there must be listed
161 * as clobbers. In this case only "r1" is used by the current routines.
162 * r8/r9 are already listed as err/val.
165 #define __put_kernel_asm(stx,x,ptr) \
166 __asm__ __volatile__ ( \
167 "\n1:\t" stx "\t%2,0(%1)\n" \
168 "\t.section __ex_table,\"aw\"\n" \
170 "1b,fixup_put_user_skip_1\n" \
173 : "r"(ptr), "r"(x), "0"(__pu_err) \
176 #define __put_user_asm(stx,x,ptr) \
177 __asm__ __volatile__ ( \
178 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \
179 "\t.section __ex_table,\"aw\"\n" \
181 "1b,fixup_put_user_skip_1\n" \
184 : "r"(ptr), "r"(x), "0"(__pu_err) \
188 #if !defined(CONFIG_64BIT)
190 #define __put_kernel_asm64(__val,ptr) do { \
191 u64 __val64 = (u64)(__val); \
192 u32 hi = (__val64) >> 32; \
193 u32 lo = (__val64) & 0xffffffff; \
194 __asm__ __volatile__ ( \
195 "\n1:\tstw %2,0(%1)\n" \
196 "\n2:\tstw %3,4(%1)\n" \
197 "\t.section __ex_table,\"aw\"\n" \
198 "\t.word\t1b,fixup_put_user_skip_2\n" \
199 "\t.word\t2b,fixup_put_user_skip_1\n" \
202 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
206 #define __put_user_asm64(__val,ptr) do { \
207 u64 __val64 = (u64)(__val); \
208 u32 hi = (__val64) >> 32; \
209 u32 lo = (__val64) & 0xffffffff; \
210 __asm__ __volatile__ ( \
211 "\n1:\tstw %2,0(%%sr3,%1)\n" \
212 "\n2:\tstw %3,4(%%sr3,%1)\n" \
213 "\t.section __ex_table,\"aw\"\n" \
214 "\t.word\t1b,fixup_put_user_skip_2\n" \
215 "\t.word\t2b,fixup_put_user_skip_1\n" \
218 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
222 #endif /* !defined(CONFIG_64BIT) */
226 * Complex access routines -- external declarations
229 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
230 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
231 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
232 extern long lstrncpy_from_user(char *, const char __user *, long);
233 extern unsigned lclear_user(void __user *,unsigned long);
234 extern long lstrnlen_user(const char __user *,long);
237 * Complex access routines -- macros
240 #define strncpy_from_user lstrncpy_from_user
241 #define strnlen_user lstrnlen_user
242 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
243 #define clear_user lclear_user
244 #define __clear_user lclear_user
246 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
247 #define __copy_to_user copy_to_user
248 unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len);
249 #define __copy_from_user copy_from_user
250 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
251 #define __copy_in_user copy_in_user
252 #define __copy_to_user_inatomic __copy_to_user
253 #define __copy_from_user_inatomic __copy_from_user
255 #endif /* __PARISC_UACCESS_H */