1 #ifndef __PARISC_UACCESS_H
2 #define __PARISC_UACCESS_H
5 * User space memory access functions
10 #include <asm-generic/uaccess-unaligned.h>
12 #include <linux/bug.h>
15 #define VERIFY_WRITE 1
17 #define KERNEL_DS ((mm_segment_t){0})
18 #define USER_DS ((mm_segment_t){1})
20 #define segment_eq(a, b) ((a).seg == (b).seg)
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))
27 * Note that since kernel addresses are in a separate address space on
28 * parisc, we don't need to do anything for access_ok().
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.
33 static inline long access_ok(int type, const void __user * addr,
39 #define put_user __put_user
40 #define get_user __get_user
42 #if !defined(CONFIG_64BIT)
43 #define LDD_KERNEL(ptr) BUILD_BUG()
44 #define LDD_USER(ptr) BUILD_BUG()
45 #define STD_KERNEL(x, ptr) __put_kernel_asm64(x, ptr)
46 #define STD_USER(x, ptr) __put_user_asm64(x, ptr)
47 #define ASM_WORD_INSN ".word\t"
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"
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
59 * the address to the fixup routine. Even on a 64bit kernel we could
60 * use a 32bit (unsigned int) address here.
63 #define ARCH_HAS_RELATIVE_EXTABLE
64 struct exception_table_entry {
65 int insn; /* relative address of insn that is allowed to fault. */
66 int fixup; /* relative address of fixup routine */
69 #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
70 ".section __ex_table,\"aw\"\n" \
71 ".word (" #fault_addr " - .), (" #except_addr " - .)\n\t" \
75 * The page fault handler stores, in a per-cpu area, the following information
76 * if a fixup routine is available.
78 struct exception_data {
79 unsigned long fault_ip;
80 unsigned long fault_space;
81 unsigned long fault_addr;
84 #define __get_user(x, ptr) \
86 register long __gu_err __asm__ ("r8") = 0; \
87 register long __gu_val __asm__ ("r9") = 0; \
89 if (segment_eq(get_fs(), KERNEL_DS)) { \
90 switch (sizeof(*(ptr))) { \
91 case 1: __get_kernel_asm("ldb", ptr); break; \
92 case 2: __get_kernel_asm("ldh", ptr); break; \
93 case 4: __get_kernel_asm("ldw", ptr); break; \
94 case 8: LDD_KERNEL(ptr); break; \
95 default: BUILD_BUG(); break; \
99 switch (sizeof(*(ptr))) { \
100 case 1: __get_user_asm("ldb", ptr); break; \
101 case 2: __get_user_asm("ldh", ptr); break; \
102 case 4: __get_user_asm("ldw", ptr); break; \
103 case 8: LDD_USER(ptr); break; \
104 default: BUILD_BUG(); break; \
108 (x) = (__force __typeof__(*(ptr))) __gu_val; \
112 #define __get_kernel_asm(ldx, ptr) \
113 __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \
114 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
115 : "=r"(__gu_val), "=r"(__gu_err) \
116 : "r"(ptr), "1"(__gu_err) \
119 #define __get_user_asm(ldx, ptr) \
120 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \
121 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
122 : "=r"(__gu_val), "=r"(__gu_err) \
123 : "r"(ptr), "1"(__gu_err) \
126 #define __put_user(x, ptr) \
128 register long __pu_err __asm__ ("r8") = 0; \
129 __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
131 if (segment_eq(get_fs(), KERNEL_DS)) { \
132 switch (sizeof(*(ptr))) { \
133 case 1: __put_kernel_asm("stb", __x, ptr); break; \
134 case 2: __put_kernel_asm("sth", __x, ptr); break; \
135 case 4: __put_kernel_asm("stw", __x, ptr); break; \
136 case 8: STD_KERNEL(__x, ptr); break; \
137 default: BUILD_BUG(); break; \
141 switch (sizeof(*(ptr))) { \
142 case 1: __put_user_asm("stb", __x, ptr); break; \
143 case 2: __put_user_asm("sth", __x, ptr); break; \
144 case 4: __put_user_asm("stw", __x, ptr); break; \
145 case 8: STD_USER(__x, ptr); break; \
146 default: BUILD_BUG(); break; \
154 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
155 * instead of writing. This is because they do not write to any memory
156 * gcc knows about, so there are no aliasing issues. These macros must
157 * also be aware that "fixup_put_user_skip_[12]" are executed in the
158 * context of the fault, and any registers used there must be listed
159 * as clobbers. In this case only "r1" is used by the current routines.
160 * r8/r9 are already listed as err/val.
163 #define __put_kernel_asm(stx, x, ptr) \
164 __asm__ __volatile__ ( \
165 "\n1:\t" stx "\t%2,0(%1)\n\t" \
166 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_put_user_skip_1)\
168 : "r"(ptr), "r"(x), "0"(__pu_err) \
171 #define __put_user_asm(stx, x, ptr) \
172 __asm__ __volatile__ ( \
173 "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \
174 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_put_user_skip_1)\
176 : "r"(ptr), "r"(x), "0"(__pu_err) \
180 #if !defined(CONFIG_64BIT)
182 #define __put_kernel_asm64(__val, ptr) do { \
183 __asm__ __volatile__ ( \
184 "\n1:\tstw %2,0(%1)" \
185 "\n2:\tstw %R2,4(%1)\n\t" \
186 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_put_user_skip_2)\
187 ASM_EXCEPTIONTABLE_ENTRY(2b, fixup_put_user_skip_1)\
189 : "r"(ptr), "r"(__val), "0"(__pu_err) \
193 #define __put_user_asm64(__val, ptr) do { \
194 __asm__ __volatile__ ( \
195 "\n1:\tstw %2,0(%%sr3,%1)" \
196 "\n2:\tstw %R2,4(%%sr3,%1)\n\t" \
197 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_put_user_skip_2)\
198 ASM_EXCEPTIONTABLE_ENTRY(2b, fixup_put_user_skip_1)\
200 : "r"(ptr), "r"(__val), "0"(__pu_err) \
204 #endif /* !defined(CONFIG_64BIT) */
208 * Complex access routines -- external declarations
211 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
212 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
213 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
214 extern long strncpy_from_user(char *, const char __user *, long);
215 extern unsigned lclear_user(void __user *, unsigned long);
216 extern long lstrnlen_user(const char __user *, long);
218 * Complex access routines -- macros
220 #define user_addr_max() (~0UL)
222 #define strnlen_user lstrnlen_user
223 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
224 #define clear_user lclear_user
225 #define __clear_user lclear_user
227 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
228 #define __copy_to_user copy_to_user
229 unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len);
230 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
231 #define __copy_in_user copy_in_user
232 #define __copy_to_user_inatomic __copy_to_user
233 #define __copy_from_user_inatomic __copy_from_user
235 extern void copy_from_user_overflow(void)
236 #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
237 __compiletime_error("copy_from_user() buffer size is not provably correct")
239 __compiletime_warning("copy_from_user() buffer size is not provably correct")
243 static inline unsigned long __must_check copy_from_user(void *to,
244 const void __user *from,
247 int sz = __compiletime_object_size(to);
250 if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
251 ret = __copy_from_user(to, from, n);
253 copy_from_user_overflow();
259 int fixup_exception(struct pt_regs *regs);
261 #endif /* __PARISC_UACCESS_H */