[Qemu-devel] [5091] Fix Sparc64 window handling problems detected by Vince Weaver

[Blue Swirl <blauwirbel@gmail.com>]

Revision: 5091
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5091
Author:   blueswir1
Date:     2008-08-27 19:19:44 +0000 (Wed, 27 Aug 2008)

Log Message:
-----------
Fix Sparc64 window handling problems detected by Vince Weaver

Modified Paths:
--------------
    trunk/linux-user/main.c

Modified: trunk/linux-user/main.c
===================================================================
--- trunk/linux-user/main.c	2008-08-27 18:43:53 UTC (rev 5090)
+++ trunk/linux-user/main.c	2008-08-27 19:19:44 UTC (rev 5091)
@@ -808,11 +808,16 @@
 
 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 @@
         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 @@
     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++;
     }
+    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
+#ifndef TARGET_SPARC64
     /* set wim so that restore will reload the registers */
-    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
     env->wim = 1 << cwp1;
+#endif
 #if defined(DEBUG_WIN)
     printf("flush_windows: nb=%d\n", offset - 1);
 #endif