--- qemu/cpu-exec.c.ORIG	2007-03-13 09:46:51.940624000 -0400
+++ qemu/cpu-exec.c	2007-03-13 09:33:34.130534000 -0400
@@ -738,7 +744,10 @@
 #else
                 gen_func();
 #endif
+/* sparc hosts don't seem to like this method very much */
+#if !(defined(__sparc__) && !defined(TARGET_I386) && !defined(TARGET_X86_64) && !defined(TARGET_PPC))
                 env->current_tb = NULL;
+#endif
                 /* reset soft MMU for next block (it can currently
                    only be set by a memory fault) */
 #if defined(TARGET_I386) && !defined(CONFIG_SOFTMMU)