--- qemu-0.12.4/target-mips/translate.c	2010-05-17 16:12:58.048661610 +0400
+++ qemu-0.12.4/target-mips/translate.c	2010-05-17 16:13:12.281656754 +0400
@@ -2761,7 +2761,7 @@
     case OPC_DINSU:
         if (lsb > msb)
             goto fail;
-        mask = ((1ULL << (msb - lsb + 1)) - 1) << lsb;
+        mask = ((1ULL << (msb - lsb + 1)) - 1) << (lsb + 32);
         gen_load_gpr(t0, rt);
         tcg_gen_andi_tl(t0, t0, ~mask);
         tcg_gen_shli_tl(t1, t1, lsb + 32);