1 files changed, 110 insertions, 0 deletions
diff --git a/scripts/reference_discarded.pl b/scripts/reference_discarded.pl
new file mode 100644
index 000000000000..d5cabb81bd1b
--- /dev/null
+++ b/scripts/reference_discarded.pl
@@ -0,0 +1,110 @@
+#!/usr/bin/perl -w
+#
+# reference_discarded.pl (C) Keith Owens 2001 <kaos@ocs.com.au>
+#
+# Released under GPL V2.
+#
+# List dangling references to vmlinux discarded sections.
+
+use strict;
+die($0 . " takes no arguments\n") if($#ARGV >= 0);
+
+my %object;
+my $object;
+my $line;
+my $ignore;
+my $errorcount;
+
+$| = 1;
+
+# printf("Finding objects, ");
+open(OBJDUMP_LIST, "find . -name '*.o' | xargs objdump -h |") || die "getting objdump list failed";
+while (defined($line = <OBJDUMP_LIST>)) {
+	chomp($line);
+	if ($line =~ /:\s+file format/) {
+		($object = $line) =~ s/:.*//;
+		$object{$object}->{'module'} = 0;
+		$object{$object}->{'size'} = 0;
+		$object{$object}->{'off'} = 0;
+	}
+	if ($line =~ /^\s*\d+\s+\.modinfo\s+/) {
+		$object{$object}->{'module'} = 1;
+	}
+	if ($line =~ /^\s*\d+\s+\.comment\s+/) {
+		($object{$object}->{'size'}, $object{$object}->{'off'}) = (split(' ', $line))[2,5];
+	}
+}
+close(OBJDUMP_LIST);
+# printf("%d objects, ", scalar keys(%object));
+$ignore = 0;
+foreach $object (keys(%object)) {
+	if ($object{$object}->{'module'}) {
+		++$ignore;
+		delete($object{$object});
+	}
+}
+# printf("ignoring %d module(s)\n", $ignore);
+
+# Ignore conglomerate objects, they have been built from multiple objects and we
+# only care about the individual objects.  If an object has more than one GCC:
+# string in the comment section then it is conglomerate.  This does not filter
+# out conglomerates that consist of exactly one object, can't be helped.
+
+# printf("Finding conglomerates, ");
+$ignore = 0;
+foreach $object (keys(%object)) {
+	if (exists($object{$object}->{'off'})) {
+		my ($off, $size, $comment, $l);
+		$off = hex($object{$object}->{'off'});
+		$size = hex($object{$object}->{'size'});
+		open(OBJECT, "<$object") || die "cannot read $object";
+		seek(OBJECT, $off, 0) || die "seek to $off in $object failed";
+		$l = read(OBJECT, $comment, $size);
+		die "read $size bytes from $object .comment failed" if ($l != $size);
+		close(OBJECT);
+		if ($comment =~ /GCC\:.*GCC\:/m || $object =~ /built-in\.o/) {
+			++$ignore;
+			delete($object{$object});
+		}
+	}
+}
+# printf("ignoring %d conglomerate(s)\n", $ignore);
+
+# printf("Scanning objects\n");
+$errorcount = 0;
+foreach $object (keys(%object)) {
+	my $from;
+	open(OBJDUMP, "objdump -r $object|") || die "cannot objdump -r $object";
+	while (defined($line = <OBJDUMP>)) {
+		chomp($line);
+		if ($line =~ /RELOCATION RECORDS FOR /) {
+			($from = $line) =~ s/.*\[([^]]*).*/$1/;
+		}
+		if (($line =~ /\.text\.exit$/ ||
+		     $line =~ /\.exit\.text$/ ||
+		     $line =~ /\.data\.exit$/ ||
+		     $line =~ /\.exit\.data$/ ||
+		     $line =~ /\.exitcall\.exit$/) &&
+		    ($from !~ /\.text\.exit$/ &&
+		     $from !~ /\.exit\.text$/ &&
+		     $from !~ /\.data\.exit$/ &&
+		     $from !~ /\.exit\.data$/ &&
+		     $from !~ /\.altinstructions$/ &&
+		     $from !~ /\.pdr$/ &&
+		     $from !~ /\.debug_info$/ &&
+		     $from !~ /\.debug_aranges$/ &&
+		     $from !~ /\.debug_ranges$/ &&
+		     $from !~ /\.debug_line$/ &&
+		     $from !~ /\.debug_frame$/ &&
+		     $from !~ /\.exitcall\.exit$/ &&
+		     $from !~ /\.eh_frame$/ &&
+		     $from !~ /\.stab$/)) {
+			printf("Error: %s %s refers to %s\n", $object, $from, $line);
+			$errorcount = $errorcount + 1;
+		}
+	}
+	close(OBJDUMP);
+}
+# printf("Done\n");
+
+exit(0);