linux/arch/powerpc/relocs_check.pl
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   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}
  67
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