scripts/markup_oops.pl

   1 #!/usr/bin/perl -w
   2
   3 # Copyright 2008, Intel Corporation
   4 #
   5 # This file is part of the Linux kernel
   6 #
   7 # This program file is free software; you can redistribute it and/or modify it
   8 # under the terms of the GNU General Public License as published by the
   9 # Free Software Foundation; version 2 of the License.
  10 #
  11 # Authors:
  12 #       Arjan van de Ven <arjan@linux.intel.com>
  13
  14
  15 my $vmlinux_name = $ARGV[0];
  16
  17 #
  18 # Step 1: Parse the oops to find the EIP value
  19 #
  20
  21 my $target = "0";
  22 while (<STDIN>) {
  23         if ($_ =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
  24                 $target = $1;
  25         }
  26 }
  27
  28 if ($target =~ /^f8/) {
  29         print "This script does not work on modules ... \n";
  30         exit;
  31 }
  32
  33 if ($target eq "0") {
  34         print "No oops found!\n";
  35         print "Usage: \n";
  36         print "    dmesg | perl scripts/markup_oops.pl vmlinux\n";
  37         exit;
  38 }
  39
  40 my $counter = 0;
  41 my $state   = 0;
  42 my $center  = 0;
  43 my @lines;
  44
  45 sub InRange {
  46         my ($address, $target) = @_;
  47         my $ad = "0x".$address;
  48         my $ta = "0x".$target;
  49         my $delta = hex($ad) - hex($ta);
  50
  51         if (($delta > -4096) && ($delta < 4096)) {
  52                 return 1;
  53         }
  54         return 0;
  55 }
  56
  57
  58
  59 # first, parse the input into the lines array, but to keep size down,
  60 # we only do this for 4Kb around the sweet spot
  61
  62 my $filename;
  63
  64 open(FILE, "objdump -dS $vmlinux_name |") || die "Cannot start objdump";
  65
  66 while (<FILE>) {
  67         my $line = $_;
  68         chomp($line);
  69         if ($state == 0) {
  70                 if ($line =~ /^([a-f0-9]+)\:/) {
  71                         if (InRange($1, $target)) {
  72                                 $state = 1;
  73                         }
  74                 }
  75         } else {
  76                 if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) {
  77                         my $val = $1;
  78                         if (!InRange($val, $target)) {
  79                                 last;
  80                         }
  81                         if ($val eq $target) {
  82                                 $center = $counter;
  83                         }
  84                 }
  85                 $lines[$counter] = $line;
  86
  87                 $counter = $counter + 1;
  88         }
  89 }
  90
  91 close(FILE);
  92
  93 if ($counter == 0) {
  94         print "No matching code found \n";
  95         exit;
  96 }
  97
  98 if ($center == 0) {
  99         print "No matching code found \n";
 100         exit;
 101 }
 102
 103 my $start;
 104 my $finish;
 105 my $codelines = 0;
 106 my $binarylines = 0;
 107 # now we go up and down in the array to find how much we want to print
 108
 109 $start = $center;
 110
 111 while ($start > 1) {
 112         $start = $start - 1;
 113         my $line = $lines[$start];
 114         if ($line =~ /^([a-f0-9]+)\:/) {
 115                 $binarylines = $binarylines + 1;
 116         } else {
 117                 $codelines = $codelines + 1;
 118         }
 119         if ($codelines > 10) {
 120                 last;
 121         }
 122         if ($binarylines > 20) {
 123                 last;
 124         }
 125 }
 126
 127
 128 $finish = $center;
 129 $codelines = 0;
 130 $binarylines = 0;
 131 while ($finish < $counter) {
 132         $finish = $finish + 1;
 133         my $line = $lines[$finish];
 134         if ($line =~ /^([a-f0-9]+)\:/) {
 135                 $binarylines = $binarylines + 1;
 136         } else {
 137                 $codelines = $codelines + 1;
 138         }
 139         if ($codelines > 10) {
 140                 last;
 141         }
 142         if ($binarylines > 20) {
 143                 last;
 144         }
 145 }
 146
 147
 148 my $i;
 149
 150 my $fulltext = "";
 151 $i = $start;
 152 while ($i < $finish) {
 153         if ($i == $center) {
 154                 $fulltext = $fulltext . "*$lines[$i]     <----- faulting instruction\n";
 155         } else {
 156                 $fulltext = $fulltext .  " $lines[$i]\n";
 157         }
 158         $i = $i +1;
 159 }
 160
 161 print $fulltext;
 162