161 lines
4.8 KiB
C
161 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_UACCESS_H
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#define __ASM_SH_UACCESS_H
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#include <asm/segment.h>
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#include <asm/extable.h>
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#define __addr_ok(addr) \
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((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
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/*
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* __access_ok: Check if address with size is OK or not.
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*
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* Uhhuh, this needs 33-bit arithmetic. We have a carry..
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*
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* sum := addr + size; carry? --> flag = true;
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* if (sum >= addr_limit) flag = true;
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*/
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#define __access_ok(addr, size) ({ \
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unsigned long __ao_a = (addr), __ao_b = (size); \
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unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b; \
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__ao_end >= __ao_a && __addr_ok(__ao_end); })
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#define access_ok(type, addr, size) \
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(__chk_user_ptr(addr), \
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__access_ok((unsigned long __force)(addr), (size)))
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#define user_addr_max() (current_thread_info()->addr_limit.seg)
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/*
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* Uh, these should become the main single-value transfer routines ...
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* They automatically use the right size if we just have the right
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* pointer type ...
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*
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* As SuperH uses the same address space for kernel and user data, we
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* can just do these as direct assignments.
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*
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* Careful to not
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* (a) re-use the arguments for side effects (sizeof is ok)
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* (b) require any knowledge of processes at this stage
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*/
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#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
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#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
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/*
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* The "__xxx" versions do not do address space checking, useful when
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* doing multiple accesses to the same area (the user has to do the
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* checks by hand with "access_ok()")
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*/
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#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
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#define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct __user *)(x))
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#define __get_user_nocheck(x,ptr,size) \
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({ \
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long __gu_err; \
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unsigned long __gu_val; \
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const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
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__chk_user_ptr(ptr); \
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__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
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(x) = (__force __typeof__(*(ptr)))__gu_val; \
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__gu_err; \
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})
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#define __get_user_check(x,ptr,size) \
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({ \
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long __gu_err = -EFAULT; \
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unsigned long __gu_val = 0; \
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const __typeof__(*(ptr)) *__gu_addr = (ptr); \
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if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
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__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
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(x) = (__force __typeof__(*(ptr)))__gu_val; \
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__gu_err; \
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})
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#define __put_user_nocheck(x,ptr,size) \
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({ \
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long __pu_err; \
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__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
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__typeof__(*(ptr)) __pu_val = x; \
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__chk_user_ptr(ptr); \
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__put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
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__pu_err; \
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})
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#define __put_user_check(x,ptr,size) \
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({ \
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long __pu_err = -EFAULT; \
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__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
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__typeof__(*(ptr)) __pu_val = x; \
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if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
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__put_user_size(__pu_val, __pu_addr, (size), \
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__pu_err); \
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__pu_err; \
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})
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#ifdef CONFIG_SUPERH32
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# include <asm/uaccess_32.h>
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#else
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# include <asm/uaccess_64.h>
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#endif
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extern long strncpy_from_user(char *dest, const char __user *src, long count);
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extern __must_check long strnlen_user(const char __user *str, long n);
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/* Generic arbitrary sized copy. */
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/* Return the number of bytes NOT copied */
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__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
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static __always_inline unsigned long
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raw_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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return __copy_user(to, (__force void *)from, n);
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}
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static __always_inline unsigned long __must_check
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raw_copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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return __copy_user((__force void *)to, from, n);
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}
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#define INLINE_COPY_FROM_USER
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#define INLINE_COPY_TO_USER
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/*
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* Clear the area and return remaining number of bytes
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* (on failure. Usually it's 0.)
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*/
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__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
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#define clear_user(addr,n) \
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({ \
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void __user * __cl_addr = (addr); \
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unsigned long __cl_size = (n); \
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\
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if (__cl_size && access_ok(VERIFY_WRITE, \
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((unsigned long)(__cl_addr)), __cl_size)) \
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__cl_size = __clear_user(__cl_addr, __cl_size); \
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\
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__cl_size; \
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})
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extern void *set_exception_table_vec(unsigned int vec, void *handler);
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static inline void *set_exception_table_evt(unsigned int evt, void *handler)
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{
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return set_exception_table_vec(evt >> 5, handler);
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}
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struct mem_access {
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unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
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unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
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};
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int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
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struct mem_access *ma, int, unsigned long address);
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#endif /* __ASM_SH_UACCESS_H */
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