Fix Sparc64 window handling problems detected by Vince Weaver

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5091 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/main.c

@@ -808,11 +808,16 @@ static void save_window(CPUSPARCState *env)
 
 static void restore_window(CPUSPARCState *env)
 {
-    unsigned int new_wim, i, cwp1;
+#ifndef TARGET_SPARC64
+    unsigned int new_wim;
+#endif
+    unsigned int i, cwp1;
     abi_ulong sp_ptr;
 
+#ifndef TARGET_SPARC64
     new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
         ((1LL << env->nwindows) - 1);
+#endif
 
     /* restore the invalid window */
     cwp1 = cpu_cwp_inc(env, env->cwp + 1);
@@ -826,12 +831,13 @@ static void restore_window(CPUSPARCState *env)
         get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
         sp_ptr += sizeof(abi_ulong);
     }
-    env->wim = new_wim;
 #ifdef TARGET_SPARC64
     env->canrestore++;
     if (env->cleanwin < env->nwindows - 1)
         env->cleanwin++;
     env->cansave--;
+#else
+    env->wim = new_wim;
 #endif
 }
 
@@ -843,14 +849,23 @@ static void flush_windows(CPUSPARCState *env)
     for(;;) {
         /* if restore would invoke restore_window(), then we can stop */
         cwp1 = cpu_cwp_inc(env, env->cwp + offset);
+#ifndef TARGET_SPARC64
         if (env->wim & (1 << cwp1))
             break;
+#else
+        if (env->canrestore == 0)
+            break;
+        env->cansave++;
+        env->canrestore--;
+#endif
         save_window_offset(env, cwp1);
         offset++;
     }
-    /* set wim so that restore will reload the registers */
     cwp1 = cpu_cwp_inc(env, env->cwp + 1);
+#ifndef TARGET_SPARC64
+    /* set wim so that restore will reload the registers */
     env->wim = 1 << cwp1;
+#endif
 #if defined(DEBUG_WIN)
     printf("flush_windows: nb=%d\n", offset - 1);
 #endif