[S390] zcore: fix inline assembly in memcpy_real()

memcpy_real uses the mvcle instruction. This instruction alters all used
registers (source, destination and 2 x count). Therefore we have to flag
those registers as input/output registers (+d). In addition to that, we
have to specify, that we read from memory designated by "src" and write to
memory designated by "dest".

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 3712ede16723..7073daf77981 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -141,15 +141,16 @@ static int memcpy_real(void *dest, unsigned long src, size_t count)
 
         if (count == 0)
                 return 0;
-        flags = __raw_local_irq_stnsm(0xf8); /* switch to real mode */
+        flags = __raw_local_irq_stnsm(0xf8UL); /* switch to real mode */
         asm volatile (
                 "0:     mvcle   %1,%2,0x0\n"
                 "1:     jo      0b\n"
                 "       lhi     %0,0x0\n"
                 "2:\n"
                 EX_TABLE(1b,2b)
-                : "+d" (rc)
-                : "d" (_dest), "d" (_src), "d" (_len1), "d" (_len2)
+                : "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),
+                  "+d" (_len2), "=m" (*((long*)dest))
+                : "m" (*((long*)src))
                 : "cc", "memory");
         __raw_local_irq_ssm(flags);