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/arch/powerpc/relocs_check.pl

https://github.com/aicjofs/android_kernel_lge_v500_20d
Perl | 66 lines | 33 code | 14 blank | 19 comment | 8 complexity | 9928361d449a4101066465d3beebfb48 MD5 | raw file
 1#!/usr/bin/perl
 2
 3# Copyright © 2009 IBM Corporation
 4
 5# This program is free software; you can redistribute it and/or
 6# modify it under the terms of the GNU General Public License
 7# as published by the Free Software Foundation; either version
 8# 2 of the License, or (at your option) any later version.
 9
10# This script checks the relcoations of a vmlinux for "suspicious"
11# relocations.
12
13use strict;
14use warnings;
15
16if ($#ARGV != 1) {
17	die "$0 [path to objdump] [path to vmlinux]\n";
18}
19
20# Have Kbuild supply the path to objdump so we handle cross compilation.
21my $objdump = shift;
22my $vmlinux = shift;
23my $bad_relocs_count = 0;
24my $bad_relocs = "";
25my $old_binutils = 0;
26
27open(FD, "$objdump -R $vmlinux|") or die;
28while (<FD>) {
29	study $_;
30
31	# Only look at relcoation lines.
32	next if (!/\s+R_/);
33
34	# These relocations are okay
35	# On PPC64:
36	# 	R_PPC64_RELATIVE, R_PPC64_NONE, R_PPC64_ADDR64
37	# On PPC:
38	# 	R_PPC_RELATIVE, R_PPC_ADDR16_HI, 
39	# 	R_PPC_ADDR16_HA,R_PPC_ADDR16_LO,
40	# 	R_PPC_NONE
41
42	next if (/\bR_PPC64_RELATIVE\b/ or /\bR_PPC64_NONE\b/ or
43	         /\bR_PPC64_ADDR64\s+mach_/);
44	next if (/\bR_PPC_ADDR16_LO\b/ or /\bR_PPC_ADDR16_HI\b/ or
45		 /\bR_PPC_ADDR16_HA\b/ or /\bR_PPC_RELATIVE\b/ or
46		 /\bR_PPC_NONE\b/);
47
48	# If we see this type of relcoation it's an idication that
49	# we /may/ be using an old version of binutils.
50	if (/R_PPC64_UADDR64/) {
51		$old_binutils++;
52	}
53
54	$bad_relocs_count++;
55	$bad_relocs .= $_;
56}
57
58if ($bad_relocs_count) {
59	print "WARNING: $bad_relocs_count bad relocations\n";
60	print $bad_relocs;
61}
62
63if ($old_binutils) {
64	print "WARNING: You need at binutils >= 2.19 to build a ".
65	      "CONFIG_RELCOATABLE kernel\n";
66}