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32 results

ohci.c

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  • uaccess.h 21.54 KiB
    /* SPDX-License-Identifier: GPL-2.0 */
    #ifndef _ASM_X86_UACCESS_H
    #define _ASM_X86_UACCESS_H
    /*
     * User space memory access functions
     */
    #include <linux/compiler.h>
    #include <linux/kasan-checks.h>
    #include <linux/string.h>
    #include <asm/asm.h>
    #include <asm/page.h>
    #include <asm/smap.h>
    #include <asm/extable.h>
    
    /*
     * The fs value determines whether argument validity checking should be
     * performed or not.  If get_fs() == USER_DS, checking is performed, with
     * get_fs() == KERNEL_DS, checking is bypassed.
     *
     * For historical reasons, these macros are grossly misnamed.
     */
    
    #define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
    
    #define KERNEL_DS	MAKE_MM_SEG(-1UL)
    #define USER_DS 	MAKE_MM_SEG(TASK_SIZE_MAX)
    
    #define get_ds()	(KERNEL_DS)
    #define get_fs()	(current->thread.addr_limit)
    static inline void set_fs(mm_segment_t fs)
    {
    	current->thread.addr_limit = fs;
    	/* On user-mode return, check fs is correct */
    	set_thread_flag(TIF_FSCHECK);
    }
    
    #define segment_eq(a, b)	((a).seg == (b).seg)
    
    #define user_addr_max() (current->thread.addr_limit.seg)
    #define __addr_ok(addr) 	\
    	((unsigned long __force)(addr) < user_addr_max())
    
    /*
     * Test whether a block of memory is a valid user space address.
     * Returns 0 if the range is valid, nonzero otherwise.
     */
    static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
    {
    	/*
    	 * If we have used "sizeof()" for the size,
    	 * we know it won't overflow the limit (but
    	 * it might overflow the 'addr', so it's
    	 * important to subtract the size from the
    	 * limit, not add it to the address).
    	 */
    	if (__builtin_constant_p(size))
    		return unlikely(addr > limit - size);
    
    	/* Arbitrary sizes? Be careful about overflow */
    	addr += size;
    	if (unlikely(addr < size))
    		return true;
    	return unlikely(addr > limit);
    }
    
    #define __range_not_ok(addr, size, limit)				\
    ({									\
    	__chk_user_ptr(addr);						\
    	__chk_range_not_ok((unsigned long __force)(addr), size, limit); \
    })
    
    #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
    # define WARN_ON_IN_IRQ()	WARN_ON_ONCE(!in_task())
    #else
    # define WARN_ON_IN_IRQ()
    #endif
    
    /**
     * access_ok: - Checks if a user space pointer is valid
     * @addr: User space pointer to start of block to check
     * @size: Size of block to check
     *
     * Context: User context only. This function may sleep if pagefaults are
     *          enabled.
     *
     * Checks if a pointer to a block of memory in user space is valid.
     *
     * Returns true (nonzero) if the memory block may be valid, false (zero)
     * if it is definitely invalid.
     *
     * Note that, depending on architecture, this function probably just
     * checks that the pointer is in the user space range - after calling
     * this function, memory access functions may still return -EFAULT.
     */
    #define access_ok(addr, size)					\
    ({									\
    	WARN_ON_IN_IRQ();						\
    	likely(!__range_not_ok(addr, size, user_addr_max()));		\
    })
    
    /*
     * These are the main single-value transfer routines.  They automatically
     * use the right size if we just have the right pointer type.
     *
     * This gets kind of ugly. We want to return _two_ values in "get_user()"
     * and yet we don't want to do any pointers, because that is too much
     * of a performance impact. Thus we have a few rather ugly macros here,
     * and hide all the ugliness from the user.
     *
     * The "__xxx" versions of the user access functions are versions that
     * do not verify the address space, that must have been done previously
     * with a separate "access_ok()" call (this is used when we do multiple
     * accesses to the same area of user memory).
     */
    
    extern int __get_user_1(void);
    extern int __get_user_2(void);
    extern int __get_user_4(void);
    extern int __get_user_8(void);
    extern int __get_user_bad(void);
    
    #define __uaccess_begin() stac()
    #define __uaccess_end()   clac()
    #define __uaccess_begin_nospec()	\
    ({					\
    	stac();				\
    	barrier_nospec();		\
    })
    
    /*
     * This is a type: either unsigned long, if the argument fits into
     * that type, or otherwise unsigned long long.
     */
    #define __inttype(x) \
    __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
    
    /**
     * get_user: - Get a simple variable from user space.
     * @x:   Variable to store result.
     * @ptr: Source address, in user space.
     *
     * Context: User context only. This function may sleep if pagefaults are
     *          enabled.
     *
     * This macro copies a single simple variable from user space to kernel
     * space.  It supports simple types like char and int, but not larger
     * data types like structures or arrays.
     *
     * @ptr must have pointer-to-simple-variable type, and the result of
     * dereferencing @ptr must be assignable to @x without a cast.
     *
     * Returns zero on success, or -EFAULT on error.
     * On error, the variable @x is set to zero.
     */
    /*
     * Careful: we have to cast the result to the type of the pointer
     * for sign reasons.
     *
     * The use of _ASM_DX as the register specifier is a bit of a
     * simplification, as gcc only cares about it as the starting point
     * and not size: for a 64-bit value it will use %ecx:%edx on 32 bits
     * (%ecx being the next register in gcc's x86 register sequence), and
     * %rdx on 64 bits.
     *
     * Clang/LLVM cares about the size of the register, but still wants
     * the base register for something that ends up being a pair.
     */
    #define get_user(x, ptr)						\
    ({									\
    	int __ret_gu;							\
    	register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX);		\
    	__chk_user_ptr(ptr);						\
    	might_fault();							\
    	asm volatile("call __get_user_%P4"				\
    		     : "=a" (__ret_gu), "=r" (__val_gu),		\
    			ASM_CALL_CONSTRAINT				\
    		     : "0" (ptr), "i" (sizeof(*(ptr))));		\
    	(x) = (__force __typeof__(*(ptr))) __val_gu;			\
    	__builtin_expect(__ret_gu, 0);					\
    })
    
    #define __put_user_x(size, x, ptr, __ret_pu)			\
    	asm volatile("call __put_user_" #size : "=a" (__ret_pu)	\
    		     : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
    
    
    
    #ifdef CONFIG_X86_32
    #define __put_user_asm_u64(x, addr, err, errret)			\
    	asm volatile("\n"						\
    		     "1:	movl %%eax,0(%2)\n"			\
    		     "2:	movl %%edx,4(%2)\n"			\
    		     "3:"						\
    		     ".section .fixup,\"ax\"\n"				\
    		     "4:	movl %3,%0\n"				\
    		     "	jmp 3b\n"					\
    		     ".previous\n"					\
    		     _ASM_EXTABLE_UA(1b, 4b)				\
    		     _ASM_EXTABLE_UA(2b, 4b)				\
    		     : "=r" (err)					\
    		     : "A" (x), "r" (addr), "i" (errret), "0" (err))
    
    #define __put_user_asm_ex_u64(x, addr)					\
    	asm volatile("\n"						\
    		     "1:	movl %%eax,0(%1)\n"			\
    		     "2:	movl %%edx,4(%1)\n"			\
    		     "3:"						\
    		     _ASM_EXTABLE_EX(1b, 2b)				\
    		     _ASM_EXTABLE_EX(2b, 3b)				\
    		     : : "A" (x), "r" (addr))
    
    #define __put_user_x8(x, ptr, __ret_pu)				\
    	asm volatile("call __put_user_8" : "=a" (__ret_pu)	\
    		     : "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
    #else
    #define __put_user_asm_u64(x, ptr, retval, errret) \
    	__put_user_asm(x, ptr, retval, "q", "", "er", errret)
    #define __put_user_asm_ex_u64(x, addr)	\
    	__put_user_asm_ex(x, addr, "q", "", "er")
    #define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
    #endif
    
    extern void __put_user_bad(void);
    
    /*
     * Strange magic calling convention: pointer in %ecx,
     * value in %eax(:%edx), return value in %eax. clobbers %rbx
     */
    extern void __put_user_1(void);
    extern void __put_user_2(void);
    extern void __put_user_4(void);
    extern void __put_user_8(void);
    
    /**
     * put_user: - Write a simple value into user space.
     * @x:   Value to copy to user space.
     * @ptr: Destination address, in user space.
     *
     * Context: User context only. This function may sleep if pagefaults are
     *          enabled.
     *
     * This macro copies a single simple value from kernel space to user
     * space.  It supports simple types like char and int, but not larger
     * data types like structures or arrays.
     *
     * @ptr must have pointer-to-simple-variable type, and @x must be assignable
     * to the result of dereferencing @ptr.
     *
     * Returns zero on success, or -EFAULT on error.
     */
    #define put_user(x, ptr)					\
    ({								\
    	int __ret_pu;						\
    	__typeof__(*(ptr)) __pu_val;				\
    	__chk_user_ptr(ptr);					\
    	might_fault();						\
    	__pu_val = x;						\
    	switch (sizeof(*(ptr))) {				\
    	case 1:							\
    		__put_user_x(1, __pu_val, ptr, __ret_pu);	\
    		break;						\
    	case 2:							\
    		__put_user_x(2, __pu_val, ptr, __ret_pu);	\
    		break;						\
    	case 4:							\
    		__put_user_x(4, __pu_val, ptr, __ret_pu);	\
    		break;						\
    	case 8:							\
    		__put_user_x8(__pu_val, ptr, __ret_pu);		\
    		break;						\
    	default:						\
    		__put_user_x(X, __pu_val, ptr, __ret_pu);	\
    		break;						\
    	}							\
    	__builtin_expect(__ret_pu, 0);				\
    })
    
    #define __put_user_size(x, ptr, size, retval, errret)			\
    do {									\
    	retval = 0;							\
    	__chk_user_ptr(ptr);						\
    	switch (size) {							\
    	case 1:								\
    		__put_user_asm(x, ptr, retval, "b", "b", "iq", errret);	\
    		break;							\
    	case 2:								\
    		__put_user_asm(x, ptr, retval, "w", "w", "ir", errret);	\
    		break;							\
    	case 4:								\
    		__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);	\
    		break;							\
    	case 8:								\
    		__put_user_asm_u64((__typeof__(*ptr))(x), ptr, retval,	\
    				   errret);				\
    		break;							\
    	default:							\
    		__put_user_bad();					\
    	}								\
    } while (0)
    
    /*
     * This doesn't do __uaccess_begin/end - the exception handling
     * around it must do that.
     */
    #define __put_user_size_ex(x, ptr, size)				\
    do {									\
    	__chk_user_ptr(ptr);						\
    	switch (size) {							\
    	case 1:								\
    		__put_user_asm_ex(x, ptr, "b", "b", "iq");		\
    		break;							\
    	case 2:								\
    		__put_user_asm_ex(x, ptr, "w", "w", "ir");		\
    		break;							\
    	case 4:								\
    		__put_user_asm_ex(x, ptr, "l", "k", "ir");		\
    		break;							\
    	case 8:								\
    		__put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr);	\
    		break;							\
    	default:							\
    		__put_user_bad();					\
    	}								\
    } while (0)
    
    #ifdef CONFIG_X86_32
    #define __get_user_asm_u64(x, ptr, retval, errret)			\
    ({									\
    	__typeof__(ptr) __ptr = (ptr);					\
    	asm volatile("\n"					\
    		     "1:	movl %2,%%eax\n"			\
    		     "2:	movl %3,%%edx\n"			\
    		     "3:\n"				\
    		     ".section .fixup,\"ax\"\n"				\
    		     "4:	mov %4,%0\n"				\
    		     "	xorl %%eax,%%eax\n"				\
    		     "	xorl %%edx,%%edx\n"				\
    		     "	jmp 3b\n"					\
    		     ".previous\n"					\
    		     _ASM_EXTABLE_UA(1b, 4b)				\
    		     _ASM_EXTABLE_UA(2b, 4b)				\
    		     : "=r" (retval), "=&A"(x)				\
    		     : "m" (__m(__ptr)), "m" __m(((u32 __user *)(__ptr)) + 1),	\
    		       "i" (errret), "0" (retval));			\
    })
    
    #define __get_user_asm_ex_u64(x, ptr)			(x) = __get_user_bad()
    #else
    #define __get_user_asm_u64(x, ptr, retval, errret) \
    	 __get_user_asm(x, ptr, retval, "q", "", "=r", errret)
    #define __get_user_asm_ex_u64(x, ptr) \
    	 __get_user_asm_ex(x, ptr, "q", "", "=r")
    #endif
    
    #define __get_user_size(x, ptr, size, retval, errret)			\
    do {									\
    	retval = 0;							\
    	__chk_user_ptr(ptr);						\
    	switch (size) {							\
    	case 1:								\
    		__get_user_asm(x, ptr, retval, "b", "b", "=q", errret);	\
    		break;							\
    	case 2:								\
    		__get_user_asm(x, ptr, retval, "w", "w", "=r", errret);	\
    		break;							\
    	case 4:								\
    		__get_user_asm(x, ptr, retval, "l", "k", "=r", errret);	\
    		break;							\
    	case 8:								\
    		__get_user_asm_u64(x, ptr, retval, errret);		\
    		break;							\
    	default:							\
    		(x) = __get_user_bad();					\
    	}								\
    } while (0)
    
    #define __get_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
    	asm volatile("\n"						\
    		     "1:	mov"itype" %2,%"rtype"1\n"		\
    		     "2:\n"						\
    		     ".section .fixup,\"ax\"\n"				\
    		     "3:	mov %3,%0\n"				\
    		     "	xor"itype" %"rtype"1,%"rtype"1\n"		\
    		     "	jmp 2b\n"					\
    		     ".previous\n"					\
    		     _ASM_EXTABLE_UA(1b, 3b)				\
    		     : "=r" (err), ltype(x)				\
    		     : "m" (__m(addr)), "i" (errret), "0" (err))
    
    #define __get_user_asm_nozero(x, addr, err, itype, rtype, ltype, errret)	\
    	asm volatile("\n"						\
    		     "1:	mov"itype" %2,%"rtype"1\n"		\
    		     "2:\n"						\
    		     ".section .fixup,\"ax\"\n"				\
    		     "3:	mov %3,%0\n"				\
    		     "	jmp 2b\n"					\
    		     ".previous\n"					\
    		     _ASM_EXTABLE_UA(1b, 3b)				\
    		     : "=r" (err), ltype(x)				\
    		     : "m" (__m(addr)), "i" (errret), "0" (err))
    
    /*
     * This doesn't do __uaccess_begin/end - the exception handling
     * around it must do that.
     */
    #define __get_user_size_ex(x, ptr, size)				\
    do {									\
    	__chk_user_ptr(ptr);						\
    	switch (size) {							\
    	case 1:								\
    		__get_user_asm_ex(x, ptr, "b", "b", "=q");		\
    		break;							\
    	case 2:								\
    		__get_user_asm_ex(x, ptr, "w", "w", "=r");		\
    		break;							\
    	case 4:								\
    		__get_user_asm_ex(x, ptr, "l", "k", "=r");		\
    		break;							\
    	case 8:								\
    		__get_user_asm_ex_u64(x, ptr);				\
    		break;							\
    	default:							\
    		(x) = __get_user_bad();					\
    	}								\
    } while (0)
    
    #define __get_user_asm_ex(x, addr, itype, rtype, ltype)			\
    	asm volatile("1:	mov"itype" %1,%"rtype"0\n"		\
    		     "2:\n"						\
    		     ".section .fixup,\"ax\"\n"				\
                         "3:xor"itype" %"rtype"0,%"rtype"0\n"		\
    		     "  jmp 2b\n"					\
    		     ".previous\n"					\
    		     _ASM_EXTABLE_EX(1b, 3b)				\
    		     : ltype(x) : "m" (__m(addr)))
    
    #define __put_user_nocheck(x, ptr, size)			\
    ({								\
    	int __pu_err;						\
    	__uaccess_begin();					\
    	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT);	\
    	__uaccess_end();					\
    	__builtin_expect(__pu_err, 0);				\
    })
    
    #define __get_user_nocheck(x, ptr, size)				\
    ({									\
    	int __gu_err;							\
    	__inttype(*(ptr)) __gu_val;					\
    	__uaccess_begin_nospec();					\
    	__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT);	\
    	__uaccess_end();						\
    	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
    	__builtin_expect(__gu_err, 0);					\
    })
    
    /* FIXME: this hack is definitely wrong -AK */
    struct __large_struct { unsigned long buf[100]; };
    #define __m(x) (*(struct __large_struct __user *)(x))
    
    /*
     * Tell gcc we read from memory instead of writing: this is because
     * we do not write to any memory gcc knows about, so there are no
     * aliasing issues.
     */
    #define __put_user_goto(x, addr, itype, rtype, ltype, label)	\
    	asm_volatile_goto("\n"						\
    		"1:	mov"itype" %"rtype"0,%1\n"			\
    		_ASM_EXTABLE_UA(1b, %l2)					\
    		: : ltype(x), "m" (__m(addr))				\
    		: : label)
    
    #define __put_user_failed(x, addr, itype, rtype, ltype, errret)		\
    	({	__label__ __puflab;					\
    		int __pufret = errret;					\
    		__put_user_goto(x,addr,itype,rtype,ltype,__puflab);	\
    		__pufret = 0;						\
    	__puflab: __pufret; })
    
    #define __put_user_asm(x, addr, retval, itype, rtype, ltype, errret)	do {	\
    	retval = __put_user_failed(x, addr, itype, rtype, ltype, errret);	\
    } while (0)
    
    #define __put_user_asm_ex(x, addr, itype, rtype, ltype)			\
    	asm volatile("1:	mov"itype" %"rtype"0,%1\n"		\
    		     "2:\n"						\
    		     _ASM_EXTABLE_EX(1b, 2b)				\
    		     : : ltype(x), "m" (__m(addr)))
    
    /*
     * uaccess_try and catch
     */
    #define uaccess_try	do {						\
    	current->thread.uaccess_err = 0;				\
    	__uaccess_begin();						\
    	barrier();
    
    #define uaccess_try_nospec do {						\
    	current->thread.uaccess_err = 0;				\
    	__uaccess_begin_nospec();					\
    
    #define uaccess_catch(err)						\
    	__uaccess_end();						\
    	(err) |= (current->thread.uaccess_err ? -EFAULT : 0);		\
    } while (0)
    
    /**
     * __get_user: - Get a simple variable from user space, with less checking.
     * @x:   Variable to store result.
     * @ptr: Source address, in user space.
     *
     * Context: User context only. This function may sleep if pagefaults are
     *          enabled.
     *
     * This macro copies a single simple variable from user space to kernel
     * space.  It supports simple types like char and int, but not larger
     * data types like structures or arrays.
     *
     * @ptr must have pointer-to-simple-variable type, and the result of
     * dereferencing @ptr must be assignable to @x without a cast.
     *
     * Caller must check the pointer with access_ok() before calling this
     * function.
     *
     * Returns zero on success, or -EFAULT on error.
     * On error, the variable @x is set to zero.
     */
    
    #define __get_user(x, ptr)						\
    	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
    
    /**
     * __put_user: - Write a simple value into user space, with less checking.
     * @x:   Value to copy to user space.
     * @ptr: Destination address, in user space.
     *
     * Context: User context only. This function may sleep if pagefaults are
     *          enabled.
     *
     * This macro copies a single simple value from kernel space to user
     * space.  It supports simple types like char and int, but not larger
     * data types like structures or arrays.
     *
     * @ptr must have pointer-to-simple-variable type, and @x must be assignable
     * to the result of dereferencing @ptr.
     *
     * Caller must check the pointer with access_ok() before calling this
     * function.
     *
     * Returns zero on success, or -EFAULT on error.
     */
    
    #define __put_user(x, ptr)						\
    	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
    
    /*
     * {get|put}_user_try and catch
     *
     * get_user_try {
     *	get_user_ex(...);
     * } get_user_catch(err)
     */
    #define get_user_try		uaccess_try_nospec
    #define get_user_catch(err)	uaccess_catch(err)
    
    #define get_user_ex(x, ptr)	do {					\
    	unsigned long __gue_val;					\
    	__get_user_size_ex((__gue_val), (ptr), (sizeof(*(ptr))));	\
    	(x) = (__force __typeof__(*(ptr)))__gue_val;			\
    } while (0)
    
    #define put_user_try		uaccess_try
    #define put_user_catch(err)	uaccess_catch(err)
    
    #define put_user_ex(x, ptr)						\
    	__put_user_size_ex((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
    
    extern unsigned long
    copy_from_user_nmi(void *to, const void __user *from, unsigned long n);
    extern __must_check long
    strncpy_from_user(char *dst, const char __user *src, long count);
    
    extern __must_check long strnlen_user(const char __user *str, long n);
    
    unsigned long __must_check clear_user(void __user *mem, unsigned long len);
    unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
    
    extern void __cmpxchg_wrong_size(void)
    	__compiletime_error("Bad argument size for cmpxchg");
    
    #define __user_atomic_cmpxchg_inatomic(uval, ptr, old, new, size)	\
    ({									\
    	int __ret = 0;							\
    	__typeof__(ptr) __uval = (uval);				\
    	__typeof__(*(ptr)) __old = (old);				\
    	__typeof__(*(ptr)) __new = (new);				\
    	__uaccess_begin_nospec();					\
    	switch (size) {							\
    	case 1:								\
    	{								\
    		asm volatile("\n"					\
    			"1:\t" LOCK_PREFIX "cmpxchgb %4, %2\n"		\
    			"2:\n"						\
    			"\t.section .fixup, \"ax\"\n"			\
    			"3:\tmov     %3, %0\n"				\
    			"\tjmp     2b\n"				\
    			"\t.previous\n"					\
    			_ASM_EXTABLE_UA(1b, 3b)				\
    			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
    			: "i" (-EFAULT), "q" (__new), "1" (__old)	\
    			: "memory"					\
    		);							\
    		break;							\
    	}								\
    	case 2:								\
    	{								\
    		asm volatile("\n"					\
    			"1:\t" LOCK_PREFIX "cmpxchgw %4, %2\n"		\
    			"2:\n"						\
    			"\t.section .fixup, \"ax\"\n"			\
    			"3:\tmov     %3, %0\n"				\
    			"\tjmp     2b\n"				\
    			"\t.previous\n"					\
    			_ASM_EXTABLE_UA(1b, 3b)				\
    			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
    			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
    			: "memory"					\
    		);							\
    		break;							\
    	}								\
    	case 4:								\
    	{								\
    		asm volatile("\n"					\
    			"1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"		\
    			"2:\n"						\
    			"\t.section .fixup, \"ax\"\n"			\
    			"3:\tmov     %3, %0\n"				\
    			"\tjmp     2b\n"				\
    			"\t.previous\n"					\
    			_ASM_EXTABLE_UA(1b, 3b)				\
    			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
    			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
    			: "memory"					\
    		);							\
    		break;							\
    	}								\
    	case 8:								\
    	{								\
    		if (!IS_ENABLED(CONFIG_X86_64))				\
    			__cmpxchg_wrong_size();				\
    									\
    		asm volatile("\n"					\
    			"1:\t" LOCK_PREFIX "cmpxchgq %4, %2\n"		\
    			"2:\n"						\
    			"\t.section .fixup, \"ax\"\n"			\
    			"3:\tmov     %3, %0\n"				\
    			"\tjmp     2b\n"				\
    			"\t.previous\n"					\
    			_ASM_EXTABLE_UA(1b, 3b)				\
    			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
    			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
    			: "memory"					\
    		);							\
    		break;							\
    	}								\
    	default:							\
    		__cmpxchg_wrong_size();					\
    	}								\
    	__uaccess_end();						\
    	*__uval = __old;						\
    	__ret;								\
    })
    
    #define user_atomic_cmpxchg_inatomic(uval, ptr, old, new)		\
    ({									\
    	access_ok((ptr), sizeof(*(ptr))) ?		\
    		__user_atomic_cmpxchg_inatomic((uval), (ptr),		\
    				(old), (new), sizeof(*(ptr))) :		\
    		-EFAULT;						\
    })
    
    /*
     * movsl can be slow when source and dest are not both 8-byte aligned
     */
    #ifdef CONFIG_X86_INTEL_USERCOPY
    extern struct movsl_mask {
    	int mask;
    } ____cacheline_aligned_in_smp movsl_mask;
    #endif
    
    #define ARCH_HAS_NOCACHE_UACCESS 1
    
    #ifdef CONFIG_X86_32
    # include <asm/uaccess_32.h>
    #else
    # include <asm/uaccess_64.h>
    #endif
    
    /*
     * We rely on the nested NMI work to allow atomic faults from the NMI path; the
     * nested NMI paths are careful to preserve CR2.
     *
     * Caller must use pagefault_enable/disable, or run in interrupt context,
     * and also do a uaccess_ok() check
     */
    #define __copy_from_user_nmi __copy_from_user_inatomic
    
    /*
     * The "unsafe" user accesses aren't really "unsafe", but the naming
     * is a big fat warning: you have to not only do the access_ok()
     * checking before using them, but you have to surround them with the
     * user_access_begin/end() pair.
     */
    static __must_check inline bool user_access_begin(const void __user *ptr, size_t len)
    {
    	if (unlikely(!access_ok(ptr,len)))
    		return 0;
    	__uaccess_begin();
    	return 1;
    }
    #define user_access_begin(a,b)	user_access_begin(a,b)
    #define user_access_end()	__uaccess_end()
    
    #define unsafe_put_user(x, ptr, err_label)					\
    do {										\
    	int __pu_err;								\
    	__typeof__(*(ptr)) __pu_val = (x);					\
    	__put_user_size(__pu_val, (ptr), sizeof(*(ptr)), __pu_err, -EFAULT);	\
    	if (unlikely(__pu_err)) goto err_label;					\
    } while (0)
    
    #define unsafe_get_user(x, ptr, err_label)					\
    do {										\
    	int __gu_err;								\
    	__inttype(*(ptr)) __gu_val;						\
    	__get_user_size(__gu_val, (ptr), sizeof(*(ptr)), __gu_err, -EFAULT);	\
    	(x) = (__force __typeof__(*(ptr)))__gu_val;				\
    	if (unlikely(__gu_err)) goto err_label;					\
    } while (0)
    
    #endif /* _ASM_X86_UACCESS_H */