Index: qemu/linux-user/syscall.c
================================================================================
--- qemu/linux-user/syscall.c
+++ qemu/linux-user/syscall.c
@@ -2087,7 +2087,12 @@
     ie = ioctl_entries;
     for(;;) {
         if (ie->target_cmd == 0) {
-            gemu_log("Unsupported ioctl: cmd=0x%04lx\n", (long)cmd);
+	    int i;
+            gemu_log("Unsupported ioctl: cmd=0x%04lx (%x)\n", cmd, (cmd & (TARGET_IOC_SIZEMASK << TARGET_IOC_SIZESHIFT)) >> TARGET_IOC_SIZESHIFT);
+	    for(i=0;ioctl_entries[i].target_cmd;i++) {
+		if((ioctl_entries[i].target_cmd & ~(TARGET_IOC_SIZEMASK << TARGET_IOC_SIZESHIFT)) == (cmd & ~(TARGET_IOC_SIZEMASK << TARGET_IOC_SIZESHIFT)))
+		    gemu_log("%p\t->\t%s (%x)\n", ioctl_entries[i].host_cmd, ioctl_entries[i].name, (ioctl_entries[i].target_cmd & (TARGET_IOC_SIZEMASK << TARGET_IOC_SIZESHIFT)) >> TARGET_IOC_SIZESHIFT);
+	    }
             return -TARGET_ENOSYS;
         }
         if (ie->target_cmd == cmd)