1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_UACCESS_H 3 #define __ASM_SH_UACCESS_H 4 5 #include <asm/segment.h> 6 #include <asm/extable.h> 7 8 #define __addr_ok(addr) \ 9 ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg) 10 11 /* 12 * __access_ok: Check if address with size is OK or not. 13 * 14 * Uhhuh, this needs 33-bit arithmetic. We have a carry.. 15 * 16 * sum := addr + size; carry? --> flag = true; 17 * if (sum >= addr_limit) flag = true; 18 */ 19 #define __access_ok(addr, size) ({ \ 20 unsigned long __ao_a = (addr), __ao_b = (size); \ 21 unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b; \ 22 __ao_end >= __ao_a && __addr_ok(__ao_end); }) 23 24 #define access_ok(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) = (__force __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(__gu_addr, (size)))) \ 73 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 74 (x) = (__force __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(__pu_addr, size))) \ 94 __put_user_size(__pu_val, __pu_addr, (size), \ 95 __pu_err); \ 96 __pu_err; \ 97 }) 98 99 # include <asm/uaccess_32.h> 100 101 extern long strncpy_from_user(char *dest, const char __user *src, long count); 102 103 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 raw_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 raw_copy_to_user(void __user *to, const void *from, unsigned long n) 117 { 118 return __copy_user((__force void *)to, from, n); 119 } 120 #define INLINE_COPY_FROM_USER 121 #define INLINE_COPY_TO_USER 122 123 /* 124 * Clear the area and return remaining number of bytes 125 * (on failure. Usually it's 0.) 126 */ 127 __kernel_size_t __clear_user(void *addr, __kernel_size_t size); 128 129 #define clear_user(addr,n) \ 130 ({ \ 131 void __user * __cl_addr = (addr); \ 132 unsigned long __cl_size = (n); \ 133 \ 134 if (__cl_size && access_ok(__cl_addr, __cl_size)) \ 135 __cl_size = __clear_user(__cl_addr, __cl_size); \ 136 \ 137 __cl_size; \ 138 }) 139 140 extern void *set_exception_table_vec(unsigned int vec, void *handler); 141 142 static inline void *set_exception_table_evt(unsigned int evt, void *handler) 143 { 144 return set_exception_table_vec(evt >> 5, handler); 145 } 146 147 struct mem_access { 148 unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt); 149 unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt); 150 }; 151 152 int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, 153 struct mem_access *ma, int, unsigned long address); 154 155 #endif /* __ASM_SH_UACCESS_H */ 156