[AARCH64] Fix __clear_cache.

From-SVN: r195203

libgcc/ChangeLog

+2013-01-15  Sofiane Naci  <sofiane.naci@arm.com>
+
+	* config/aarch64/sync-cache.c (__aarch64_sync_cache_range): Update
+	loop start address for cache clearing.
+
 2013-01-14  Georg-Johann Lay  <avr@gjlay.de>
 
 	* config/avr/lib1funcs.S: Remove trailing blanks.

libgcc/config/aarch64/sync-cache.c

@@ -39,7 +39,10 @@ __aarch64_sync_cache_range (const void *base, const void *end)
      instruction cache fetches the updated data.  'end' is exclusive,
      as per the GNU definition of __clear_cache.  */
 
-  for (address = base; address < (const char *) end; address += dcache_lsize)
+  /* Make the start address of the loop cache aligned.  */
+  address = (const char*) ((unsigned long) base & ~ (dcache_lsize - 1));
+
+  for (address; address < (const char *) end; address += dcache_lsize)
     asm volatile ("dc\tcvau, %0"
 		  :
 		  : "r" (address)
@@ -47,7 +50,10 @@ __aarch64_sync_cache_range (const void *base, const void *end)
 
   asm volatile ("dsb\tish" : : : "memory");
 
-  for (address = base; address < (const char *) end; address += icache_lsize)
+  /* Make the start address of the loop cache aligned.  */
+  address = (const char*) ((unsigned long) base & ~ (icache_lsize - 1));
+
+  for (address; address < (const char *) end; address += icache_lsize)
     asm volatile ("ic\tivau, %0"
 		  :
 		  : "r" (address)