1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_UACCESS_H 3 #define __ASM_SH_UACCESS_H 4 5 #include <asm/extable.h> 6 #include <asm-generic/access_ok.h> 7 8 /* 9 * Uh, these should become the main single-value transfer routines ... 10 * They automatically use the right size if we just have the right 11 * pointer type ... 12 * 13 * As SuperH uses the same address space for kernel and user data, we 14 * can just do these as direct assignments. 15 * 16 * Careful to not 17 * (a) re-use the arguments for side effects (sizeof is ok) 18 * (b) require any knowledge of processes at this stage 19 */ 20 #define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr))) 21 #define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr))) 22 23 /* 24 * The "__xxx" versions do not do address space checking, useful when 25 * doing multiple accesses to the same area (the user has to do the 26 * checks by hand with "access_ok()") 27 */ 28 #define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr))) 29 #define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr))) 30 31 struct __large_struct { unsigned long buf[100]; }; 32 #define __m(x) (*(struct __large_struct __user *)(x)) 33 34 #define __get_user_nocheck(x,ptr,size) \ 35 ({ \ 36 long __gu_err; \ 37 unsigned long __gu_val; \ 38 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ 39 __chk_user_ptr(ptr); \ 40 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 41 (x) = (__force __typeof__(*(ptr)))__gu_val; \ 42 __gu_err; \ 43 }) 44 45 #define __get_user_check(x,ptr,size) \ 46 ({ \ 47 long __gu_err = -EFAULT; \ 48 unsigned long __gu_val = 0; \ 49 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ 50 if (likely(access_ok(__gu_addr, (size)))) \ 51 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ 52 (x) = (__force __typeof__(*(ptr)))__gu_val; \ 53 __gu_err; \ 54 }) 55 56 #define __put_user_nocheck(x,ptr,size) \ 57 ({ \ 58 long __pu_err; \ 59 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ 60 __typeof__(*(ptr)) __pu_val = x; \ 61 __chk_user_ptr(ptr); \ 62 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \ 63 __pu_err; \ 64 }) 65 66 #define __put_user_check(x,ptr,size) \ 67 ({ \ 68 long __pu_err = -EFAULT; \ 69 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ 70 __typeof__(*(ptr)) __pu_val = x; \ 71 if (likely(access_ok(__pu_addr, size))) \ 72 __put_user_size(__pu_val, __pu_addr, (size), \ 73 __pu_err); \ 74 __pu_err; \ 75 }) 76 77 # include <asm/uaccess_32.h> 78 79 extern long strncpy_from_user(char *dest, const char __user *src, long count); 80 81 extern __must_check long strnlen_user(const char __user *str, long n); 82 83 /* Generic arbitrary sized copy. */ 84 /* Return the number of bytes NOT copied */ 85 __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n); 86 87 static __always_inline unsigned long 88 raw_copy_from_user(void *to, const void __user *from, unsigned long n) 89 { 90 return __copy_user(to, (__force void *)from, n); 91 } 92 93 static __always_inline unsigned long __must_check 94 raw_copy_to_user(void __user *to, const void *from, unsigned long n) 95 { 96 return __copy_user((__force void *)to, from, n); 97 } 98 #define INLINE_COPY_FROM_USER 99 #define INLINE_COPY_TO_USER 100 101 /* 102 * Clear the area and return remaining number of bytes 103 * (on failure. Usually it's 0.) 104 */ 105 __kernel_size_t __clear_user(void __user *addr, __kernel_size_t size); 106 107 #define clear_user(addr,n) \ 108 ({ \ 109 void __user * __cl_addr = (addr); \ 110 unsigned long __cl_size = (n); \ 111 \ 112 if (__cl_size && access_ok(__cl_addr, __cl_size)) \ 113 __cl_size = __clear_user(__cl_addr, __cl_size); \ 114 \ 115 __cl_size; \ 116 }) 117 118 extern void *set_exception_table_vec(unsigned int vec, void *handler); 119 120 static inline void *set_exception_table_evt(unsigned int evt, void *handler) 121 { 122 return set_exception_table_vec(evt >> 5, handler); 123 } 124 125 struct mem_access { 126 unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt); 127 unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt); 128 }; 129 130 int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, 131 struct mem_access *ma, int, unsigned long address); 132 133 #endif /* __ASM_SH_UACCESS_H */ 134