1 files changed, 66 insertions, 0 deletions
diff --git a/arch/powerpc/relocs_check.pl b/arch/powerpc/relocs_check.pl
new file mode 100755
index 00000000..7f5b8380
--- /dev/null
+++ b/arch/powerpc/relocs_check.pl
@@ -0,0 +1,66 @@
+#!/usr/bin/perl
+
+# Copyright © 2009 IBM Corporation
+
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version
+# 2 of the License, or (at your option) any later version.
+
+# This script checks the relcoations of a vmlinux for "suspicious"
+# relocations.
+
+use strict;
+use warnings;
+
+if ($#ARGV != 1) {
+	die "$0 [path to objdump] [path to vmlinux]\n";
+}
+
+# Have Kbuild supply the path to objdump so we handle cross compilation.
+my $objdump = shift;
+my $vmlinux = shift;
+my $bad_relocs_count = 0;
+my $bad_relocs = "";
+my $old_binutils = 0;
+
+open(FD, "$objdump -R $vmlinux|") or die;
+while (<FD>) {
+	study $_;
+
+	# Only look at relcoation lines.
+	next if (!/\s+R_/);
+
+	# These relocations are okay
+	# On PPC64:
+	# 	R_PPC64_RELATIVE, R_PPC64_NONE, R_PPC64_ADDR64
+	# On PPC:
+	# 	R_PPC_RELATIVE, R_PPC_ADDR16_HI, 
+	# 	R_PPC_ADDR16_HA,R_PPC_ADDR16_LO,
+	# 	R_PPC_NONE
+
+	next if (/\bR_PPC64_RELATIVE\b/ or /\bR_PPC64_NONE\b/ or
+	         /\bR_PPC64_ADDR64\s+mach_/);
+	next if (/\bR_PPC_ADDR16_LO\b/ or /\bR_PPC_ADDR16_HI\b/ or
+		 /\bR_PPC_ADDR16_HA\b/ or /\bR_PPC_RELATIVE\b/ or
+		 /\bR_PPC_NONE\b/);
+
+	# If we see this type of relcoation it's an idication that
+	# we /may/ be using an old version of binutils.
+	if (/R_PPC64_UADDR64/) {
+		$old_binutils++;
+	}
+
+	$bad_relocs_count++;
+	$bad_relocs .= $_;
+}
+
+if ($bad_relocs_count) {
+	print "WARNING: $bad_relocs_count bad relocations\n";
+	print $bad_relocs;
+}
+
+if ($old_binutils) {
+	print "WARNING: You need at binutils >= 2.19 to build a ".
+	      "CONFIG_RELCOATABLE kernel\n";
+}