microblaze: uaccess: Fix get_user macro for noMMU
Use unified version. Signed-off-by: Michal Simek <monstr@monstr.eu>
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@ -146,31 +146,75 @@ static inline unsigned long __must_check clear_user(void __user *to,
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#ifndef CONFIG_MMU
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#ifndef CONFIG_MMU
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/* Undefined function to trigger linker error */
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extern long __user_bad(void);
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extern int bad_user_access_length(void);
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/* FIXME this is function for optimalization -> memcpy */
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#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
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#define __get_user(var, ptr) \
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({ \
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({ \
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__asm__ __volatile__ ( \
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int __gu_err = 0; \
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"1:" insn " %1, %2, r0;" \
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switch (sizeof(*(ptr))) { \
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" addk %0, r0, r0;" \
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case 1: \
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"2: " \
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case 2: \
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__FIXUP_SECTION \
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case 4: \
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"3: brid 2b;" \
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(var) = *(ptr); \
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" addik %0, r0, %3;" \
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break; \
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".previous;" \
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case 8: \
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__EX_TABLE_SECTION \
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memcpy((void *) &(var), (ptr), 8); \
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".word 1b,3b;" \
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break; \
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".previous;" \
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default: \
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: "=&r"(__gu_err), "=r"(__gu_val) \
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(var) = 0; \
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: "r"(__gu_ptr), "i"(-EFAULT) \
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__gu_err = __get_user_bad(); \
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); \
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break; \
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} \
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__gu_err; \
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})
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})
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#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
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/**
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* get_user: - Get a simple variable from user space.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*/
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#define __get_user(x, ptr) \
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({ \
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unsigned long __gu_val; \
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/*unsigned long __gu_ptr = (unsigned long)(ptr);*/ \
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long __gu_err; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
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break; \
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case 2: \
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__get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
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break; \
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case 4: \
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__get_user_asm("lw", (ptr), __gu_val, __gu_err); \
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break; \
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default: \
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/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
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} \
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x = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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})
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#define get_user(x, ptr) \
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({ \
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access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) \
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? __get_user((x), (ptr)) : -EFAULT; \
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})
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/* Undefined function to trigger linker error */
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extern int bad_user_access_length(void);
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/* FIXME is not there defined __pu_val */
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/* FIXME is not there defined __pu_val */
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#define __put_user(var, ptr) \
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#define __put_user(var, ptr) \
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@ -197,7 +241,6 @@ extern int bad_user_access_length(void);
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#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
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#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
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#define put_user(x, ptr) __put_user((x), (ptr))
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#define put_user(x, ptr) __put_user((x), (ptr))
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#define get_user(x, ptr) __get_user((x), (ptr))
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#define copy_to_user(to, from, n) (memcpy((to), (from), (n)), 0)
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#define copy_to_user(to, from, n) (memcpy((to), (from), (n)), 0)
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#define copy_from_user(to, from, n) (memcpy((to), (from), (n)), 0)
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#define copy_from_user(to, from, n) (memcpy((to), (from), (n)), 0)
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