diff --git a/sys/pci/locate.pl b/sys/pci/locate.pl
new file mode 100755
index 00000000000..5fcb5d93b0c
--- /dev/null
+++ b/sys/pci/locate.pl
@@ -0,0 +1,31 @@
+#!/usr/local/bin/perl
+
+$errpos = hex($ARGV[0])/4;
+$ofs=0;
+
+open (INPUT, "cc -E ncr.c 2>/dev/null |");
+
+while ($_ = <INPUT>)
+{
+    last if /^struct script \{/;
+}
+
+while ($_ = <INPUT>)
+{
+    last if /^\}\;/;
+    ($label, $size) = /ncrcmd\s+(\S+)\s+\[([^]]+)/;
+    $size = eval($size);
+    if ($label) {
+	if ($errpos) {
+	    if ($ofs + $size > $errpos) {
+		printf ("%4x: %s\n", $ofs * 4, $label);
+		printf ("%4x: %s + %d\n", $errpos * 4, $label, $errpos - $ofs);
+		last;
+	    }
+	    $ofs += $size;
+	} else {
+	    printf ("%4x: %s\n", $ofs * 4, $label);
+	}
+    }
+}
+