[S390] Inline assembly cleanup.

Major cleanup of all s390 inline assemblies. They now have a common
coding style. Quite a few have been shortened, mainly by using register
asm variables. Use of the EX_TABLE macro helps  as well. The atomic ops,
bit ops and locking inlines new use the Q-constraint if a newer gcc
is used.  That results in slightly better code.

Thanks to Christian Borntraeger for proof reading the changes.

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

1 files changed, 17 insertions, 22 deletions

diff --git a/drivers/s390/net/iucv.c b/drivers/s390/net/iucv.c
index 821dde86e240..809dd8d7f47a 100644
--- a/drivers/s390/net/iucv.c
+++ b/drivers/s390/net/iucv.c
@@ -534,19 +534,15 @@ iucv_add_handler (handler *new)
  *
  * Returns: return code from CP's IUCV call
  */
-static __inline__ ulong
-b2f0(__u32 code, void *parm)
+static inline ulong b2f0(__u32 code, void *parm)
 {
+        register unsigned long reg0 asm ("0");
+        register unsigned long reg1 asm ("1");
         iucv_dumpit("iparml before b2f0 call:", parm, sizeof(iucv_param));
 
-        asm volatile (
-                "LRA   1,0(%1)\n\t"
-                "LR    0,%0\n\t"
-                ".long 0xb2f01000"
-                :
-                : "d" (code), "a" (parm)
-                : "0", "1"
-                );
+        reg0 = code;
+        reg1 = virt_to_phys(parm);
+        asm volatile(".long 0xb2f01000" : : "d" (reg0), "a" (reg1));
 
         iucv_dumpit("iparml after b2f0 call:", parm, sizeof(iucv_param));
 
@@ -1248,6 +1244,8 @@ iucv_purge (__u16 pathid, __u32 msgid, __u32 srccls, __u32 *audit)
 static int
 iucv_query_generic(int want_maxconn)
 {
+        register unsigned long reg0 asm ("0");
+        register unsigned long reg1 asm ("1");
         iparml_purge *parm = (iparml_purge *)grab_param();
         int bufsize, maxconn;
         int ccode;
@@ -1256,18 +1254,15 @@ iucv_query_generic(int want_maxconn)
          * Call b2f0 and store R0 (max buffer size),
          * R1 (max connections) and CC.
          */
-        asm volatile (
-                "LRA   1,0(%4)\n\t"
-                "LR    0,%3\n\t"
-                ".long 0xb2f01000\n\t"
-                "IPM   %0\n\t"
-                "SRL   %0,28\n\t"
-                "ST    0,%1\n\t"
-                "ST    1,%2\n\t"
-                : "=d" (ccode), "=m" (bufsize), "=m" (maxconn)
-                : "d" (QUERY), "a" (parm)
-                : "0", "1", "cc"
-                );
+        reg0 = QUERY;
+        reg1 = virt_to_phys(parm);
+        asm volatile(
+                "       .long   0xb2f01000\n"
+                "       ipm     %0\n"
+                "       srl     %0,28\n"
+                : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
+        bufsize = reg0;
+        maxconn = reg1;
         release_param(parm);
 
         if (ccode)