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