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>
13 #include <linux/string.h>
16 #define VERIFY_WRITE 1
18 #define KERNEL_DS ((mm_segment_t){0})
19 #define USER_DS ((mm_segment_t){1})
21 #define segment_eq(a,b) ((a).seg == (b).seg)
23 #define get_ds() (KERNEL_DS)
24 #define get_fs() (current_thread_info()->addr_limit)
25 #define set_fs(x) (current_thread_info()->addr_limit = (x))
28 * Note that since kernel addresses are in a separate address space on
29 * parisc, we don't need to do anything for access_ok().
30 * We just let the page fault handler do the right thing. This also means
31 * that put_user is the same as __put_user, etc.
34 extern int __get_kernel_bad(void);
35 extern int __get_user_bad(void);
36 extern int __put_kernel_bad(void);
37 extern int __put_user_bad(void);
39 static inline long access_ok(int type, const void __user * addr,
45 #define put_user __put_user
46 #define get_user __get_user
48 #if !defined(CONFIG_64BIT)
49 #define LDD_KERNEL(ptr) __get_kernel_bad();
50 #define LDD_USER(ptr) __get_user_bad();
51 #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr)
52 #define STD_USER(x, ptr) __put_user_asm64(x,ptr)
53 #define ASM_WORD_INSN ".word\t"
55 #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
56 #define LDD_USER(ptr) __get_user_asm("ldd",ptr)
57 #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
58 #define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
59 #define ASM_WORD_INSN ".dword\t"
63 * The exception table contains two values: the first is an address
64 * for an instruction that is allowed to fault, and the second is
65 * the address to the fixup routine.
68 struct exception_table_entry {
69 unsigned long insn; /* address of insn that is allowed to fault. */
70 long fixup; /* fixup routine */
73 #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
74 ".section __ex_table,\"aw\"\n" \
75 ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
79 * The page fault handler stores, in a per-cpu area, the following information
80 * if a fixup routine is available.
82 struct exception_data {
83 unsigned long fault_ip;
84 unsigned long fault_gp;
85 unsigned long fault_space;
86 unsigned long fault_addr;
89 #define __get_user(x,ptr) \
91 register long __gu_err __asm__ ("r8") = 0; \
92 register long __gu_val __asm__ ("r9") = 0; \
94 if (segment_eq(get_fs(),KERNEL_DS)) { \
95 switch (sizeof(*(ptr))) { \
96 case 1: __get_kernel_asm("ldb",ptr); break; \
97 case 2: __get_kernel_asm("ldh",ptr); break; \
98 case 4: __get_kernel_asm("ldw",ptr); break; \
99 case 8: LDD_KERNEL(ptr); break; \
100 default: __get_kernel_bad(); break; \
104 switch (sizeof(*(ptr))) { \
105 case 1: __get_user_asm("ldb",ptr); break; \
106 case 2: __get_user_asm("ldh",ptr); break; \
107 case 4: __get_user_asm("ldw",ptr); break; \
108 case 8: LDD_USER(ptr); break; \
109 default: __get_user_bad(); break; \
113 (x) = (__typeof__(*(ptr))) __gu_val; \
117 #define __get_kernel_asm(ldx,ptr) \
118 __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \
119 ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
120 : "=r"(__gu_val), "=r"(__gu_err) \
121 : "r"(ptr), "1"(__gu_err) \
124 #define __get_user_asm(ldx,ptr) \
125 __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \
126 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
127 : "=r"(__gu_val), "=r"(__gu_err) \
128 : "r"(ptr), "1"(__gu_err) \
131 #define __put_user(x,ptr) \
133 register long __pu_err __asm__ ("r8") = 0; \
134 __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
136 if (segment_eq(get_fs(),KERNEL_DS)) { \
137 switch (sizeof(*(ptr))) { \
138 case 1: __put_kernel_asm("stb",__x,ptr); break; \
139 case 2: __put_kernel_asm("sth",__x,ptr); break; \
140 case 4: __put_kernel_asm("stw",__x,ptr); break; \
141 case 8: STD_KERNEL(__x,ptr); break; \
142 default: __put_kernel_bad(); break; \
146 switch (sizeof(*(ptr))) { \
147 case 1: __put_user_asm("stb",__x,ptr); break; \
148 case 2: __put_user_asm("sth",__x,ptr); break; \
149 case 4: __put_user_asm("stw",__x,ptr); break; \
150 case 8: STD_USER(__x,ptr); break; \
151 default: __put_user_bad(); break; \
159 * The "__put_user/kernel_asm()" macros tell gcc they read from memory
160 * instead of writing. This is because they do not write to any memory
161 * gcc knows about, so there are no aliasing issues. These macros must
162 * also be aware that "fixup_put_user_skip_[12]" are executed in the
163 * context of the fault, and any registers used there must be listed
164 * as clobbers. In this case only "r1" is used by the current routines.
165 * r8/r9 are already listed as err/val.
168 #define __put_kernel_asm(stx,x,ptr) \
169 __asm__ __volatile__ ( \
170 "\n1:\t" stx "\t%2,0(%1)\n\t" \
171 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
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\t" \
179 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
181 : "r"(ptr), "r"(x), "0"(__pu_err) \
185 #if !defined(CONFIG_64BIT)
187 #define __put_kernel_asm64(__val,ptr) do { \
188 u64 __val64 = (u64)(__val); \
189 u32 hi = (__val64) >> 32; \
190 u32 lo = (__val64) & 0xffffffff; \
191 __asm__ __volatile__ ( \
192 "\n1:\tstw %2,0(%1)" \
193 "\n2:\tstw %3,4(%1)\n\t" \
194 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
195 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
197 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
201 #define __put_user_asm64(__val,ptr) do { \
202 u64 __val64 = (u64)(__val); \
203 u32 hi = (__val64) >> 32; \
204 u32 lo = (__val64) & 0xffffffff; \
205 __asm__ __volatile__ ( \
206 "\n1:\tstw %2,0(%%sr3,%1)" \
207 "\n2:\tstw %3,4(%%sr3,%1)\n\t" \
208 ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
209 ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
211 : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
215 #endif /* !defined(CONFIG_64BIT) */
219 * Complex access routines -- external declarations
222 extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
223 extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
224 extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
225 extern long lstrncpy_from_user(char *, const char __user *, long);
226 extern unsigned lclear_user(void __user *,unsigned long);
227 extern long lstrnlen_user(const char __user *,long);
230 * Complex access routines -- macros
233 #define strncpy_from_user lstrncpy_from_user
234 #define strnlen_user lstrnlen_user
235 #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
236 #define clear_user lclear_user
237 #define __clear_user lclear_user
239 unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
240 #define __copy_to_user copy_to_user
241 unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len);
242 unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
243 #define __copy_in_user copy_in_user
244 #define __copy_to_user_inatomic __copy_to_user
245 #define __copy_from_user_inatomic __copy_from_user
247 extern void copy_from_user_overflow(void)
248 #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
249 __compiletime_error("copy_from_user() buffer size is not provably correct")
251 __compiletime_warning("copy_from_user() buffer size is not provably correct")
255 static inline unsigned long __must_check copy_from_user(void *to,
256 const void __user *from,
259 int sz = __compiletime_object_size(to);
260 unsigned long ret = n;
262 if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
263 ret = __copy_from_user(to, from, n);
265 copy_from_user_overflow();
267 memset(to + (n - ret), 0, ret);
272 int fixup_exception(struct pt_regs *regs);
274 #endif /* __PARISC_UACCESS_H */