script: improve markup_oops.pl to also decode oopses in modules

[safe/jmp/linux-2.6] / scripts / markup_oops.pl

#!/usr/bin/perl -w

use File::Basename;

# Copyright 2008, Intel Corporation
#
# This file is part of the Linux kernel
#
# This program file 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; version 2 of the License.
#
# Authors:
#       Arjan van de Ven <arjan@linux.intel.com>


my $vmlinux_name = $ARGV[0];
if (!defined($vmlinux_name)) {
        my $kerver = `uname -r`;
        chomp($kerver);
        $vmlinux_name = "/lib/modules/$kerver/build/vmlinux";
        print "No vmlinux specified, assuming $vmlinux_name\n";
}
my $filename = $vmlinux_name;
#
# Step 1: Parse the oops to find the EIP value
#

my $target = "0";
my $function;
my $module = "";
my $func_offset;
my $vmaoffset = 0;

while (<STDIN>) {
        my $line = $_;
        if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
                $target = $1;
        }
        if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]/) {
                $function = $1;
                $func_offset = $2;
        }

        # check if it's a module
        if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) {
                $module = $3;
        }
}

my $decodestart = hex($target) - hex($func_offset);
my $decodestop = $decodestart + 8192;
if ($target eq "0") {
        print "No oops found!\n";
        print "Usage: \n";
        print "    dmesg | perl scripts/markup_oops.pl vmlinux\n";
        exit;
}

# if it's a module, we need to find the .ko file and calculate a load offset
if ($module ne "") {
        my $dir = dirname($filename);
        $dir = $dir . "/";
        my $mod = $module . ".ko";
        my $modulefile = `find $dir -name $mod | head -1`;
        chomp($modulefile);
        $filename = $modulefile;
        if ($filename eq "") {
                print "Module .ko file for $module not found. Aborting\n";
                exit;
        }
        # ok so we found the module, now we need to calculate the vma offset
        open(FILE, "objdump -dS $filename |") || die "Cannot start objdump";
        while (<FILE>) {
                if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) {
                        my $fu = $1;
                        $vmaoffset = hex($target) - hex($fu) - hex($func_offset);
                }
        }
        close(FILE);
}

my $counter = 0;
my $state   = 0;
my $center  = 0;
my @lines;

sub InRange {
        my ($address, $target) = @_;
        my $ad = "0x".$address;
        my $ta = "0x".$target;
        my $delta = hex($ad) - hex($ta);

        if (($delta > -4096) && ($delta < 4096)) {
                return 1;
        }
        return 0;
}



# first, parse the input into the lines array, but to keep size down,
# we only do this for 4Kb around the sweet spot

open(FILE, "objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump";

while (<FILE>) {
        my $line = $_;
        chomp($line);
        if ($state == 0) {
                if ($line =~ /^([a-f0-9]+)\:/) {
                        if (InRange($1, $target)) {
                                $state = 1;
                        }
                }
        } else {
                if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) {
                        my $val = $1;
                        if (!InRange($val, $target)) {
                                last;
                        }
                        if ($val eq $target) {
                                $center = $counter;
                        }
                }
                $lines[$counter] = $line;

                $counter = $counter + 1;
        }
}

close(FILE);

if ($counter == 0) {
        print "No matching code found \n";
        exit;
}

if ($center == 0) {
        print "No matching code found \n";
        exit;
}

my $start;
my $finish;
my $codelines = 0;
my $binarylines = 0;
# now we go up and down in the array to find how much we want to print

$start = $center;

while ($start > 1) {
        $start = $start - 1;
        my $line = $lines[$start];
        if ($line =~ /^([a-f0-9]+)\:/) {
                $binarylines = $binarylines + 1;
        } else {
                $codelines = $codelines + 1;
        }
        if ($codelines > 10) {
                last;
        }
        if ($binarylines > 20) {
                last;
        }
}


$finish = $center;
$codelines = 0;
$binarylines = 0;
while ($finish < $counter) {
        $finish = $finish + 1;
        my $line = $lines[$finish];
        if ($line =~ /^([a-f0-9]+)\:/) {
                $binarylines = $binarylines + 1;
        } else {
                $codelines = $codelines + 1;
        }
        if ($codelines > 10) {
                last;
        }
        if ($binarylines > 20) {
                last;
        }
}


my $i;

my $fulltext = "";
$i = $start;
while ($i < $finish) {
        if ($i == $center) {
                $fulltext = $fulltext . "*$lines[$i]     <----- faulting instruction\n";
        } else {
                $fulltext = $fulltext .  " $lines[$i]\n";
        }
        $i = $i +1;
}

print $fulltext;