1 #ifndef __ASM_SH_UACCESS_H 2 #define __ASM_SH_UACCESS_H 3 4 #include <linux/errno.h> 5 #include <linux/sched.h> 6 #include <asm/segment.h> 7 8 #define VERIFY_READ 0 9 #define VERIFY_WRITE 1 10 11 #define __addr_ok(addr) \ 12 ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg) 13 14 /* 15 * __access_ok: Check if address with size is OK or not. 16 * 17 * Uhhuh, this needs 33-bit arithmetic. We have a carry.. 18 * 19 * sum := addr + size; carry? --> flag = true; 20 * if (sum >= addr_limit) flag = true; 21 */ 22 #define __access_ok(addr, size) \ 23 (__addr_ok((addr) + (size))) 24 #define access_ok(type, addr, size) \ 25 (__chk_user_ptr(addr), \ 26 __access_ok((unsigned long __force)(addr), (size))) 27 28 #define user_addr_max() (current_thread_info()->addr_limit.seg) 29 30 /* 31 * Uh, these should become the main single-value transfer routines ... 32 * They automatically use the right size if we just have the right 33 * pointer type ... 34 * 35 * As SuperH uses the same address space for kernel and user data, we 36 * can just do these as direct assignments. 37 * 38 * Careful to not 39 * (a) re-use the arguments for side effects (sizeof is ok) 40 * (b) require any knowledge of processes at this stage 41 */ 42 #define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr))) 43 #define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr))) 44 45 /* 46 * The "__xxx" versions do not do address space checking, useful when 47 * doing multiple accesses to the same area (the user has to do the 48 * checks by hand with "access_ok()") 49 */ 50 #define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr))) 51 #define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr))) 52 53 struct __large_struct { unsigned long buf[100]; }; 54 #define __m(x) (*(struct __large_struct __user *)(x)) 55 56 #define __get_user_nocheck(x,ptr,size) \ 57 ({ \ 58 long __gu_err; \ 59 unsigned long __gu_val; \ 60 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ 61 __chk_user_ptr(ptr); \ 62 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 63 (x) = (__typeof__(*(ptr)))__gu_val; \ 64 __gu_err; \ 65 }) 66 67 #define __get_user_check(x,ptr,size) \ 68 ({ \ 69 long __gu_err = -EFAULT; \ 70 unsigned long __gu_val = 0; \ 71 const __typeof__(*(ptr)) *__gu_addr = (ptr); \ 72 if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \ 73 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 74 (x) = (__typeof__(*(ptr)))__gu_val; \ 75 __gu_err; \ 76 }) 77 78 #define __put_user_nocheck(x,ptr,size) \ 79 ({ \ 80 long __pu_err; \ 81 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ 82 __typeof__(*(ptr)) __pu_val = x; \ 83 __chk_user_ptr(ptr); \ 84 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \ 85 __pu_err; \ 86 }) 87 88 #define __put_user_check(x,ptr,size) \ 89 ({ \ 90 long __pu_err = -EFAULT; \ 91 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ 92 __typeof__(*(ptr)) __pu_val = x; \ 93 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \ 94 __put_user_size(__pu_val, __pu_addr, (size), \ 95 __pu_err); \ 96 __pu_err; \ 97 }) 98 99 #ifdef CONFIG_SUPERH32 100 # include <asm/uaccess_32.h> 101 #else 102 # include <asm/uaccess_64.h> 103 #endif 104 105 extern long strncpy_from_user(char *dest, const char __user *src, long count); 106 107 extern __must_check long strlen_user(const char __user *str); 108 extern __must_check long strnlen_user(const char __user *str, long n); 109 110 /* Generic arbitrary sized copy. */ 111 /* Return the number of bytes NOT copied */ 112 __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n); 113 114 static __always_inline unsigned long 115 __copy_from_user(void *to, const void __user *from, unsigned long n) 116 { 117 return __copy_user(to, (__force void *)from, n); 118 } 119 120 static __always_inline unsigned long __must_check 121 __copy_to_user(void __user *to, const void *from, unsigned long n) 122 { 123 return __copy_user((__force void *)to, from, n); 124 } 125 126 #define __copy_to_user_inatomic __copy_to_user 127 #define __copy_from_user_inatomic __copy_from_user 128 129 /* 130 * Clear the area and return remaining number of bytes 131 * (on failure. Usually it's 0.) 132 */ 133 __kernel_size_t __clear_user(void *addr, __kernel_size_t size); 134 135 #define clear_user(addr,n) \ 136 ({ \ 137 void __user * __cl_addr = (addr); \ 138 unsigned long __cl_size = (n); \ 139 \ 140 if (__cl_size && access_ok(VERIFY_WRITE, \ 141 ((unsigned long)(__cl_addr)), __cl_size)) \ 142 __cl_size = __clear_user(__cl_addr, __cl_size); \ 143 \ 144 __cl_size; \ 145 }) 146 147 static inline unsigned long 148 copy_from_user(void *to, const void __user *from, unsigned long n) 149 { 150 unsigned long __copy_from = (unsigned long) from; 151 __kernel_size_t __copy_size = (__kernel_size_t) n; 152 153 if (__copy_size && __access_ok(__copy_from, __copy_size)) 154 return __copy_user(to, from, __copy_size); 155 156 return __copy_size; 157 } 158 159 static inline unsigned long 160 copy_to_user(void __user *to, const void *from, unsigned long n) 161 { 162 unsigned long __copy_to = (unsigned long) to; 163 __kernel_size_t __copy_size = (__kernel_size_t) n; 164 165 if (__copy_size && __access_ok(__copy_to, __copy_size)) 166 return __copy_user(to, from, __copy_size); 167 168 return __copy_size; 169 } 170 171 /* 172 * The exception table consists of pairs of addresses: the first is the 173 * address of an instruction that is allowed to fault, and the second is 174 * the address at which the program should continue. No registers are 175 * modified, so it is entirely up to the continuation code to figure out 176 * what to do. 177 * 178 * All the routines below use bits of fixup code that are out of line 179 * with the main instruction path. This means when everything is well, 180 * we don't even have to jump over them. Further, they do not intrude 181 * on our cache or tlb entries. 182 */ 183 struct exception_table_entry { 184 unsigned long insn, fixup; 185 }; 186 187 #if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU) 188 #define ARCH_HAS_SEARCH_EXTABLE 189 #endif 190 191 int fixup_exception(struct pt_regs *regs); 192 /* Returns 0 if exception not found and fixup.unit otherwise. */ 193 unsigned long search_exception_table(unsigned long addr); 194 const struct exception_table_entry *search_exception_tables(unsigned long addr); 195 196 extern void *set_exception_table_vec(unsigned int vec, void *handler); 197 198 static inline void *set_exception_table_evt(unsigned int evt, void *handler) 199 { 200 return set_exception_table_vec(evt >> 5, handler); 201 } 202 203 struct mem_access { 204 unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt); 205 unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt); 206 }; 207 208 int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, 209 struct mem_access *ma, int, unsigned long address); 210 211 #endif /* __ASM_SH_UACCESS_H */ 212