diff --git a/disassem.pl b/disassem.pl
index 3766c9d..525dca1 100755
--- a/disassem.pl
+++ b/disassem.pl
@@ -56,6 +56,21 @@ $baseaddr = 0xff0000;
 %labels = {};
 $labelnum = 0;
 
+if (open LABELS, "<input.labels") {
+    while (<LABELS>) {
+	chomp;
+	if (($name, $addr) = /(.*): (.*)/) {
+	    $addr = hex $addr;
+	    $labels{$addr} = $name;
+	    if ($name =~ /^L(\d+)$/) {
+		$labelnum = $1 + 1 if ($labelnum >= $1);
+	    }
+	}
+    }
+}
+
+close LABELS;
+
 $output = 0;
 
 %io = (
@@ -192,6 +207,15 @@ for my $pass (0..1) {
     }
 }
 
+open LABELS, ">input.labels" or die $!;
+
+foreach my $addr (sort keys %labels) {
+    printf LABELS "%s: %.6x\n", $labels{$addr}, $addr
+	if defined($labels{$addr});
+}
+
+close LABELS;
+
 sub disassemble
 {
     my ($start) = @_;