1 #ifndef __ASM_SH_UACCESS_H 2 #define __ASM_SH_UACCESS_H 3 4 #include <asm/segment.h> 5 #include <asm/extable.h> 6 7 #define __addr_ok(addr) \ 8 ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg) 9 10 /* 11 * __access_ok: Check if address with size is OK or not. 12 * 13 * Uhhuh, this needs 33-bit arithmetic. We have a carry.. 14 * 15 * sum := addr + size; carry? --> flag = true; 16 * if (sum >= addr_limit) flag = true; 17 */ 18 #define __access_ok(addr, size) \ 19 (__addr_ok((addr) + (size))) 20 #define access_ok(type, addr, size) \ 21 (__chk_user_ptr(addr), \ 22 __access_ok((unsigned long __force)(addr), (size))) 23 24 #define user_addr_max() (current_thread_info()->addr_limit.seg) 25 26 /* 27 * Uh, these should become the main single-value transfer routines ... 28 * They automatically use the right size if we just have the right 29 * pointer type ... 30 * 31 * As SuperH uses the same address space for kernel and user data, we 32 * can just do these as direct assignments. 33 * 34 * Careful to not 35 * (a) re-use the arguments for side effects (sizeof is ok) 36 * (b) require any knowledge of processes at this stage 37 */ 38 #define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr))) 39 #define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr))) 40 41 /* 42 * The "__xxx" versions do not do address space checking, useful when 43 * doing multiple accesses to the same area (the user has to do the 44 * checks by hand with "access_ok()") 45 */ 46 #define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr))) 47 #define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr))) 48 49 struct __large_struct { unsigned long buf[100]; }; 50 #define __m(x) (*(struct __large_struct __user *)(x)) 51 52 #define __get_user_nocheck(x,ptr,size) \ 53 ({ \ 54 long __gu_err; \ 55 unsigned long __gu_val; \ 56 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ 57 __chk_user_ptr(ptr); \ 58 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 59 (x) = (__force __typeof__(*(ptr)))__gu_val; \ 60 __gu_err; \ 61 }) 62 63 #define __get_user_check(x,ptr,size) \ 64 ({ \ 65 long __gu_err = -EFAULT; \ 66 unsigned long __gu_val = 0; \ 67 const __typeof__(*(ptr)) *__gu_addr = (ptr); \ 68 if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \ 69 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 70 (x) = (__force __typeof__(*(ptr)))__gu_val; \ 71 __gu_err; \ 72 }) 73 74 #define __put_user_nocheck(x,ptr,size) \ 75 ({ \ 76 long __pu_err; \ 77 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ 78 __typeof__(*(ptr)) __pu_val = x; \ 79 __chk_user_ptr(ptr); \ 80 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \ 81 __pu_err; \ 82 }) 83 84 #define __put_user_check(x,ptr,size) \ 85 ({ \ 86 long __pu_err = -EFAULT; \ 87 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ 88 __typeof__(*(ptr)) __pu_val = x; \ 89 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \ 90 __put_user_size(__pu_val, __pu_addr, (size), \ 91 __pu_err); \ 92 __pu_err; \ 93 }) 94 95 #ifdef CONFIG_SUPERH32 96 # include <asm/uaccess_32.h> 97 #else 98 # include <asm/uaccess_64.h> 99 #endif 100 101 extern long strncpy_from_user(char *dest, const char __user *src, long count); 102 103 extern __must_check long strlen_user(const char __user *str); 104 extern __must_check long strnlen_user(const char __user *str, long n); 105 106 /* Generic arbitrary sized copy. */ 107 /* Return the number of bytes NOT copied */ 108 __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n); 109 110 static __always_inline unsigned long 111 raw_copy_from_user(void *to, const void __user *from, unsigned long n) 112 { 113 return __copy_user(to, (__force void *)from, n); 114 } 115 116 static __always_inline unsigned long __must_check 117 raw_copy_to_user(void __user *to, const void *from, unsigned long n) 118 { 119 return __copy_user((__force void *)to, from, n); 120 } 121 #define INLINE_COPY_FROM_USER 122 #define INLINE_COPY_TO_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 extern void *set_exception_table_vec(unsigned int vec, void *handler); 143 144 static inline void *set_exception_table_evt(unsigned int evt, void *handler) 145 { 146 return set_exception_table_vec(evt >> 5, handler); 147 } 148 149 struct mem_access { 150 unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt); 151 unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt); 152 }; 153 154 int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, 155 struct mem_access *ma, int, unsigned long address); 156 157 #endif /* __ASM_SH_UACCESS_H */ 158