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