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| 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 |
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