1 files changed, 39 insertions, 9 deletions

diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index a4cd7af475e9..4767eb9caa78 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -107,8 +107,11 @@ static inline void set_fs(mm_segment_t fs)
 extern int __get_user_1(void *);
 extern int __get_user_2(void *);
 extern int __get_user_4(void *);
-extern int __get_user_lo8(void *);
+extern int __get_user_32t_8(void *);
 extern int __get_user_8(void *);
+extern int __get_user_64t_1(void *);
+extern int __get_user_64t_2(void *);
+extern int __get_user_64t_4(void *);
 
 #define __GUP_CLOBBER_1 "lr", "cc"
 #ifdef CONFIG_CPU_USE_DOMAINS
@@ -117,7 +120,7 @@ extern int __get_user_8(void *);
 #define __GUP_CLOBBER_2 "lr", "cc"
 #endif
 #define __GUP_CLOBBER_4 "lr", "cc"
-#define __GUP_CLOBBER_lo8 "lr", "cc"
+#define __GUP_CLOBBER_32t_8 "lr", "cc"
 #define __GUP_CLOBBER_8 "lr", "cc"
 
 #define __get_user_x(__r2,__p,__e,__l,__s)                              \
@@ -131,12 +134,30 @@ extern int __get_user_8(void *);
 
 /* narrowing a double-word get into a single 32bit word register: */
 #ifdef __ARMEB__
-#define __get_user_xb(__r2, __p, __e, __l, __s)                         \
-        __get_user_x(__r2, __p, __e, __l, lo8)
+#define __get_user_x_32t(__r2, __p, __e, __l, __s)                              \
+        __get_user_x(__r2, __p, __e, __l, 32t_8)
 #else
-#define __get_user_xb __get_user_x
+#define __get_user_x_32t __get_user_x
 #endif
 
+/*
+ * storing result into proper least significant word of 64bit target var,
+ * different only for big endian case where 64 bit __r2 lsw is r3:
+ */
+#ifdef __ARMEB__
+#define __get_user_x_64t(__r2, __p, __e, __l, __s)                      \
+           __asm__ __volatile__ (                                       \
+                __asmeq("%0", "r0") __asmeq("%1", "r2")                 \
+                __asmeq("%3", "r1")                                     \
+                "bl     __get_user_64t_" #__s                           \
+                : "=&r" (__e), "=r" (__r2)                              \
+                : "0" (__p), "r" (__l)                                  \
+                : __GUP_CLOBBER_##__s)
+#else
+#define __get_user_x_64t __get_user_x
+#endif
+
+
 #define __get_user_check(x,p)                                                   \
         ({                                                              \
                 unsigned long __limit = current_thread_info()->addr_limit - 1; \
@@ -146,17 +167,26 @@ extern int __get_user_8(void *);
                 register int __e asm("r0");                             \
                 switch (sizeof(*(__p))) {                               \
                 case 1:                                                 \
-                        __get_user_x(__r2, __p, __e, __l, 1);           \
+                        if (sizeof((x)) >= 8)                           \
+                                __get_user_x_64t(__r2, __p, __e, __l, 1); \
+                        else                                            \
+                                __get_user_x(__r2, __p, __e, __l, 1);   \
                         break;                                          \
                 case 2:                                                 \
-                        __get_user_x(__r2, __p, __e, __l, 2);           \
+                        if (sizeof((x)) >= 8)                           \
+                                __get_user_x_64t(__r2, __p, __e, __l, 2); \
+                        else                                            \
+                                __get_user_x(__r2, __p, __e, __l, 2);   \
                         break;                                          \
                 case 4:                                                 \
-                        __get_user_x(__r2, __p, __e, __l, 4);           \
+                        if (sizeof((x)) >= 8)                           \
+                                __get_user_x_64t(__r2, __p, __e, __l, 4); \
+                        else                                            \
+                                __get_user_x(__r2, __p, __e, __l, 4);   \
                         break;                                          \
                 case 8:                                                 \
                         if (sizeof((x)) < 8)                            \
-                                __get_user_xb(__r2, __p, __e, __l, 4);  \
+                                __get_user_x_32t(__r2, __p, __e, __l, 4); \
                         else                                            \
                                 __get_user_x(__r2, __p, __e, __l, 8);   \
                         break;                                          \