waterDataFluctuationCorrelation dataOperationOfSprayTerminal.h 袁明明 commit at 2021-02-10

waterDataFluctuationCorrelation/databaseOperation/dataOperationOfSprayTerminal.h

@@ -206,3 +206,63 @@ extern int fixup_exception(struct pt_regs *regs);
  * 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)))
+
+#define __get_user_nocheck(x,ptr,size)					\
+({									\
+	long __gu_err = 0;						\
+	unsigned long __gu_val;						\
+	might_sleep();							\
+	__get_user_size(__gu_val,(ptr),(size),__gu_err);		\
+	(x) = (__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)) __user *__gu_addr = (ptr);		\
+	might_sleep();							\
+	if (access_ok(VERIFY_READ,__gu_addr,size))			\
+		__get_user_size(__gu_val,__gu_addr,(size),__gu_err);	\
+	(x) = (__typeof__(*(ptr)))__gu_val;				\
+	__gu_err;							\
+})
+
+extern long __get_user_bad(void);
+
+#define __get_user_size(x,ptr,size,retval)				\
+do {									\
+	retval = 0;							\
+	__chk_user_ptr(ptr);						\
+	switch (size) {							\
+	  case 1: __get_user_asm(x,ptr,retval,"ub"); break;		\
+	  case 2: __get_user_asm(x,ptr,retval,"uh"); break;		\
+	  case 4: __get_user_asm(x,ptr,retval,""); break;		\
+	  default: (x) = __get_user_bad();				\
+	}								\
+} while (0)
+
+#define __get_user_asm(x, addr, err, itype)				\
+	__asm__ __volatile__(						\
+		"	.fillinsn\n"					\
+		"1:	ld"itype" %1,@%2\n"				\
+		"	.fillinsn\n"					\
+		"2:\n"							\
+		".section .fixup,\"ax\"\n"				\
+		"	.balign 4\n"					\
+		"3:	ldi %0,%3\n"					\
+		"	seth r14,#high(2b)\n"				\
+		"	or3 r14,r14,#low(2b)\n"				\
+		"	jmp r14\n"					\
+		".previous\n"						\
+		".section __ex_table,\"a\"\n"				\
+		"	.balign 4\n"					\
+		"	.long 1b,3b\n"					\
+		".previous"						\
+		: "=&r" (err), "=&r" (x)				\