uaccess.h (4145B)
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 31struct __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 79extern long strncpy_from_user(char *dest, const char __user *src, long count); 80 81extern __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 87static __always_inline unsigned long 88raw_copy_from_user(void *to, const void __user *from, unsigned long n) 89{ 90 return __copy_user(to, (__force void *)from, n); 91} 92 93static __always_inline unsigned long __must_check 94raw_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 118extern void *set_exception_table_vec(unsigned int vec, void *handler); 119 120static inline void *set_exception_table_evt(unsigned int evt, void *handler) 121{ 122 return set_exception_table_vec(evt >> 5, handler); 123} 124 125struct 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 130int 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 */