1 #ifndef __PARISC_UACCESS_H
2 #define __PARISC_UACCESS_H
5 * User space memory access functions
8 #include <asm/system.h>
10 #include <asm/errno.h>
11 #include <asm-generic/uaccess-unaligned.h>
14 #define VERIFY_WRITE 1
16 #define KERNEL_DS ((mm_segment_t){0})
17 #define USER_DS ((mm_segment_t){1})
19 #define segment_eq(a,b) ((a).seg == (b).seg)
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))
26 * Note that since kernel addresses are in a separate address space on
27 * parisc, we don't need to do anything for access_ok().
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.
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);
37 static inline long access_ok(int type, const void __user * addr,
43 #define put_user __put_user
44 #define get_user __get_user
46 #if !defined(CONFIG_64BIT)
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 #define ASM_WORD_INSN ".word\t"
53 #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
54 #define LDD_USER(ptr) __get_user_asm("ldd",ptr)
55 #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
56 #define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
57 #define ASM_WORD_INSN ".dword\t"
61 * The exception table contains two values: the first is an address
62 * for an instruction that is allowed to fault, and the second is
63 * the address to the fixup routine.
66 struct exception_table_entry {
67 unsigned long insn; /* address of insn that is allowed to fault. */
68 long fixup; /* fixup routine */
71 #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
72 ".section __ex_table,\"aw\"\n" \
73 ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
77 * The page fault handler stores, in a per-cpu area, the following information
78 * if a fixup routine is available.
80 struct exception_data {
81 unsigned long fault_ip;
82 unsigned long fault_gp;
83 unsigned long fault_space;
84 unsigned long fault_addr;
87 #define __get_user(x,ptr) \
89 register long __gu_err __asm__ ("r8") = 0; \
90 register long __gu_val __asm__ ("r9") = 0; \
92 if (segment_eq(get_fs(),KERNEL_DS)) { \
93 switch (sizeof(*(ptr))) { \
94 case 1: __get_kernel_asm("ldb",ptr); break; \
95 case 2: __get_kernel_asm("ldh",ptr); break; \
96 case 4: __get_kernel_asm("ldw",ptr); break; \
97 case 8: LDD_KERNEL(ptr); break; \
98 default: __get_kernel_bad(); break; \
102 switch (sizeof(*(ptr))) { \
103 case 1: __get_user_asm("ldb",ptr); break; \
104 case 2: __get_user_asm("ldh",ptr); break; \
105 case 4: __get_user_asm("ldw",ptr); break; \
106 case 8: LDD_USER(ptr); break; \
107 default: __get_user_bad(); break; \
111 (x) = (__typeof__(*(ptr))) __gu_val; \
115 #define __get_kernel_asm(ldx,ptr) \
116 __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \
117 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
118 : "=r"(__gu_val), "=r"(__gu_err) \
119 : "r"(ptr), "1"(__gu_err) \
122 #define __get_user_asm(ldx,ptr) \
123 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \
124 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
125 : "=r"(__gu_val), "=r"(__gu_err) \
126 : "r"(ptr), "1"(__gu_err) \
129 #define __put_user(x,ptr) \
131 register long __pu_err __asm__ ("r8") = 0; \
132 __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
134 if (segment_eq(get_fs(),KERNEL_DS)) { \
135 switch (sizeof(*(ptr))) { \
136 case 1: __put_kernel_asm("stb",__x,ptr); break; \
137 case 2: __put_kernel_asm("sth",__x,ptr); break; \
138 case 4: __put_kernel_asm("stw",__x,ptr); break; \
139 case 8: STD_KERNEL(__x,ptr); break; \
140 default: __put_kernel_bad(); break; \
144 switch (sizeof(*(ptr))) { \
145 case 1: __put_user_asm("stb",__x,ptr); break; \
146 case 2: __put_user_asm("sth",__x,ptr); break; \
147 case 4: __put_user_asm("stw",__x,ptr); break; \
148 case 8: STD_USER(__x,ptr); break; \
149 default: __put_user_bad(); break; \
157 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
158 * instead of writing. This is because they do not write to any memory
159 * gcc knows about, so there are no aliasing issues. These macros must
160 * also be aware that "fixup_put_user_skip_[12]" are executed in the
161 * context of the fault, and any registers used there must be listed
162 * as clobbers. In this case only "r1" is used by the current routines.
163 * r8/r9 are already listed as err/val.
166 #define __put_kernel_asm(stx,x,ptr) \
167 __asm__ __volatile__ ( \
168 "\n1:\t" stx "\t%2,0(%1)\n\t" \
169 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
171 : "r"(ptr), "r"(x), "0"(__pu_err) \
174 #define __put_user_asm(stx,x,ptr) \
175 __asm__ __volatile__ ( \
176 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \
177 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
179 : "r"(ptr), "r"(x), "0"(__pu_err) \
183 #if !defined(CONFIG_64BIT)
185 #define __put_kernel_asm64(__val,ptr) do { \
186 u64 __val64 = (u64)(__val); \
187 u32 hi = (__val64) >> 32; \
188 u32 lo = (__val64) & 0xffffffff; \
189 __asm__ __volatile__ ( \
190 "\n1:\tstw %2,0(%1)" \
191 "\n2:\tstw %3,4(%1)\n\t" \
192 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
193 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
195 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
199 #define __put_user_asm64(__val,ptr) do { \
200 u64 __val64 = (u64)(__val); \
201 u32 hi = (__val64) >> 32; \
202 u32 lo = (__val64) & 0xffffffff; \
203 __asm__ __volatile__ ( \
204 "\n1:\tstw %2,0(%%sr3,%1)" \
205 "\n2:\tstw %3,4(%%sr3,%1)\n\t" \
206 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
207 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
209 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
213 #endif /* !defined(CONFIG_64BIT) */
217 * Complex access routines -- external declarations
220 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
221 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
222 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
223 extern long lstrncpy_from_user(char *, const char __user *, long);
224 extern unsigned lclear_user(void __user *,unsigned long);
225 extern long lstrnlen_user(const char __user *,long);
228 * Complex access routines -- macros
231 #define strncpy_from_user lstrncpy_from_user
232 #define strnlen_user lstrnlen_user
233 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
234 #define clear_user lclear_user
235 #define __clear_user lclear_user
237 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
238 #define __copy_to_user copy_to_user
239 unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len);
240 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
241 #define __copy_in_user copy_in_user
242 #define __copy_to_user_inatomic __copy_to_user
243 #define __copy_from_user_inatomic __copy_from_user
245 extern void copy_from_user_overflow(void)
246 #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
247 __compiletime_error("copy_from_user() buffer size is not provably correct")
249 __compiletime_warning("copy_from_user() buffer size is not provably correct")
253 static inline unsigned long __must_check copy_from_user(void *to,
254 const void __user *from,
257 int sz = __compiletime_object_size(to);
260 if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
261 ret = __copy_from_user(to, from, n);
263 copy_from_user_overflow();
269 int fixup_exception(struct pt_regs *regs);
271 #endif /* __PARISC_UACCESS_H */