ARM: 8137/1: fix get_user BE behavior for target variable with size of 8 bytes

e38361d 'ARM: 8091/2: add get_user() support for 8 byte types' commit
broke V7 BE get_user call when target var size is 64 bit, but '*ptr' size
is 32 bit or smaller. e38361d changed type of __r2 from 'register
unsigned long' to 'register typeof(x) __r2 asm("r2")' i.e before the change
even when target variable size was 64 bit, __r2 was still 32 bit.
But after e38361d commit, for target var of 64 bit size, __r2 became 64
bit and now it should occupy 2 registers r2, and r3. The issue in BE case
that r3 register is least significant word of __r2 and r2 register is most
significant word of __r2. But __get_user_4 still copies result into r2 (most
significant word of __r2). Subsequent code copies from __r2 into x, but
for situation described it will pick up only garbage from r3 register.

Special __get_user_64t_(124) functions are introduced. They are similar to
corresponding __get_user_(124) function but result stored in r3 register
(lsw in case of 64 bit __r2 in BE image). Those function are used by
get_user macro in case of BE and target var size is 64bit.

Also changed __get_user_lo8 name into __get_user_32t_8 to get consistent
naming accross all cases.

Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org>
Suggested-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index a4cd7af..4767eb9 100644 (file)
--- 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;                                          \

diff --git a/arch/arm/lib/getuser.S b/arch/arm/lib/getuser.S
index 9386000..8ecfd15 100644 (file)
--- a/arch/arm/lib/getuser.S
+++ b/arch/arm/lib/getuser.S
@@ -80,7 +80,7 @@ ENTRY(__get_user_8)
 ENDPROC(__get_user_8)
 
 #ifdef __ARMEB__
-ENTRY(__get_user_lo8)
+ENTRY(__get_user_32t_8)
        check_uaccess r0, 8, r1, r2, __get_user_bad
 #ifdef CONFIG_CPU_USE_DOMAINS
        add     r0, r0, #4
@@ -90,7 +90,37 @@ ENTRY(__get_user_lo8)
 #endif
        mov     r0, #0
        ret     lr
-ENDPROC(__get_user_lo8)
+ENDPROC(__get_user_32t_8)
+
+ENTRY(__get_user_64t_1)
+       check_uaccess r0, 1, r1, r2, __get_user_bad8
+8: TUSER(ldrb) r3, [r0]
+       mov     r0, #0
+       ret     lr
+ENDPROC(__get_user_64t_1)
+
+ENTRY(__get_user_64t_2)
+       check_uaccess r0, 2, r1, r2, __get_user_bad8
+#ifdef CONFIG_CPU_USE_DOMAINS
+rb     .req    ip
+9:     ldrbt   r3, [r0], #1
+10:    ldrbt   rb, [r0], #0
+#else
+rb     .req    r0
+9:     ldrb    r3, [r0]
+10:    ldrb    rb, [r0, #1]
+#endif
+       orr     r3, rb, r3, lsl #8
+       mov     r0, #0
+       ret     lr
+ENDPROC(__get_user_64t_2)
+
+ENTRY(__get_user_64t_4)
+       check_uaccess r0, 4, r1, r2, __get_user_bad8
+11: TUSER(ldr) r3, [r0]
+       mov     r0, #0
+       ret     lr
+ENDPROC(__get_user_64t_4)
 #endif
 
 __get_user_bad8:
@@ -111,5 +141,9 @@ ENDPROC(__get_user_bad8)
        .long   6b, __get_user_bad8
 #ifdef __ARMEB__
        .long   7b, __get_user_bad
+       .long   8b, __get_user_bad8
+       .long   9b, __get_user_bad8
+       .long   10b, __get_user_bad8
+       .long   11b, __get_user_bad8
 #endif
 .popsection