370 строки
8.1 KiB
Perl
Executable File
370 строки
8.1 KiB
Perl
Executable File
#!/usr/bin/env perl
|
|
|
|
use File::Basename;
|
|
use Math::BigInt;
|
|
use Getopt::Long;
|
|
|
|
# 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 $cross_compile = "";
|
|
my $vmlinux_name = "";
|
|
my $modulefile = "";
|
|
|
|
# Get options
|
|
Getopt::Long::GetOptions(
|
|
'cross-compile|c=s' => \$cross_compile,
|
|
'module|m=s' => \$modulefile,
|
|
'help|h' => \&usage,
|
|
) || usage ();
|
|
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;
|
|
|
|
# Parse the oops to find the EIP value
|
|
|
|
my $target = "0";
|
|
my $function;
|
|
my $module = "";
|
|
my $func_offset = 0;
|
|
my $vmaoffset = 0;
|
|
|
|
my %regs;
|
|
|
|
|
|
sub parse_x86_regs
|
|
{
|
|
my ($line) = @_;
|
|
if ($line =~ /EAX: ([0-9a-f]+) EBX: ([0-9a-f]+) ECX: ([0-9a-f]+) EDX: ([0-9a-f]+)/) {
|
|
$regs{"%eax"} = $1;
|
|
$regs{"%ebx"} = $2;
|
|
$regs{"%ecx"} = $3;
|
|
$regs{"%edx"} = $4;
|
|
}
|
|
if ($line =~ /ESI: ([0-9a-f]+) EDI: ([0-9a-f]+) EBP: ([0-9a-f]+) ESP: ([0-9a-f]+)/) {
|
|
$regs{"%esi"} = $1;
|
|
$regs{"%edi"} = $2;
|
|
$regs{"%esp"} = $4;
|
|
}
|
|
if ($line =~ /RAX: ([0-9a-f]+) RBX: ([0-9a-f]+) RCX: ([0-9a-f]+)/) {
|
|
$regs{"%eax"} = $1;
|
|
$regs{"%ebx"} = $2;
|
|
$regs{"%ecx"} = $3;
|
|
}
|
|
if ($line =~ /RDX: ([0-9a-f]+) RSI: ([0-9a-f]+) RDI: ([0-9a-f]+)/) {
|
|
$regs{"%edx"} = $1;
|
|
$regs{"%esi"} = $2;
|
|
$regs{"%edi"} = $3;
|
|
}
|
|
if ($line =~ /RBP: ([0-9a-f]+) R08: ([0-9a-f]+) R09: ([0-9a-f]+)/) {
|
|
$regs{"%r08"} = $2;
|
|
$regs{"%r09"} = $3;
|
|
}
|
|
if ($line =~ /R10: ([0-9a-f]+) R11: ([0-9a-f]+) R12: ([0-9a-f]+)/) {
|
|
$regs{"%r10"} = $1;
|
|
$regs{"%r11"} = $2;
|
|
$regs{"%r12"} = $3;
|
|
}
|
|
if ($line =~ /R13: ([0-9a-f]+) R14: ([0-9a-f]+) R15: ([0-9a-f]+)/) {
|
|
$regs{"%r13"} = $1;
|
|
$regs{"%r14"} = $2;
|
|
$regs{"%r15"} = $3;
|
|
}
|
|
}
|
|
|
|
sub reg_name
|
|
{
|
|
my ($reg) = @_;
|
|
$reg =~ s/r(.)x/e\1x/;
|
|
$reg =~ s/r(.)i/e\1i/;
|
|
$reg =~ s/r(.)p/e\1p/;
|
|
return $reg;
|
|
}
|
|
|
|
sub process_x86_regs
|
|
{
|
|
my ($line, $cntr) = @_;
|
|
my $str = "";
|
|
if (length($line) < 40) {
|
|
return ""; # not an asm istruction
|
|
}
|
|
|
|
# find the arguments to the instruction
|
|
if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+]+)$/) {
|
|
$lastword = $1;
|
|
} else {
|
|
return "";
|
|
}
|
|
|
|
# we need to find the registers that get clobbered,
|
|
# since their value is no longer relevant for previous
|
|
# instructions in the stream.
|
|
|
|
$clobber = $lastword;
|
|
# first, remove all memory operands, they're read only
|
|
$clobber =~ s/\([a-z0-9\%\,]+\)//g;
|
|
# then, remove everything before the comma, thats the read part
|
|
$clobber =~ s/.*\,//g;
|
|
|
|
# if this is the instruction that faulted, we haven't actually done
|
|
# the write yet... nothing is clobbered.
|
|
if ($cntr == 0) {
|
|
$clobber = "";
|
|
}
|
|
|
|
foreach $reg (keys(%regs)) {
|
|
my $clobberprime = reg_name($clobber);
|
|
my $lastwordprime = reg_name($lastword);
|
|
my $val = $regs{$reg};
|
|
if ($val =~ /^[0]+$/) {
|
|
$val = "0";
|
|
} else {
|
|
$val =~ s/^0*//;
|
|
}
|
|
|
|
# first check if we're clobbering this register; if we do
|
|
# we print it with a =>, and then delete its value
|
|
if ($clobber =~ /$reg/ || $clobberprime =~ /$reg/) {
|
|
if (length($val) > 0) {
|
|
$str = $str . " $reg => $val ";
|
|
}
|
|
$regs{$reg} = "";
|
|
$val = "";
|
|
}
|
|
# now check if we're reading this register
|
|
if ($lastword =~ /$reg/ || $lastwordprime =~ /$reg/) {
|
|
if (length($val) > 0) {
|
|
$str = $str . " $reg = $val ";
|
|
}
|
|
}
|
|
}
|
|
return $str;
|
|
}
|
|
|
|
# parse the oops
|
|
while (<STDIN>) {
|
|
my $line = $_;
|
|
if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
|
|
$target = $1;
|
|
}
|
|
if ($line =~ /RIP: 0010:\[\<([a-z0-9]+)\>\]/) {
|
|
$target = $1;
|
|
}
|
|
if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+0x([0-9a-f]+)\/0x[a-f0-9]/) {
|
|
$function = $1;
|
|
$func_offset = $2;
|
|
}
|
|
if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([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 = $3;
|
|
}
|
|
if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) {
|
|
$module = $3;
|
|
}
|
|
parse_x86_regs($line);
|
|
}
|
|
|
|
my $decodestart = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$func_offset");
|
|
my $decodestop = Math::BigInt->from_hex("0x$target") + 8192;
|
|
if ($target eq "0") {
|
|
print "No oops found!\n";
|
|
usage();
|
|
}
|
|
|
|
# if it's a module, we need to find the .ko file and calculate a load offset
|
|
if ($module ne "") {
|
|
if ($modulefile eq "") {
|
|
$modulefile = `modinfo -F filename $module`;
|
|
chomp($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, $cross_compile."objdump -dS $filename |") || die "Cannot start objdump";
|
|
while (<FILE>) {
|
|
if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) {
|
|
my $fu = $1;
|
|
$vmaoffset = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$fu") - Math::BigInt->from_hex("0x$func_offset");
|
|
}
|
|
}
|
|
close(FILE);
|
|
}
|
|
|
|
my $counter = 0;
|
|
my $state = 0;
|
|
my $center = -1;
|
|
my @lines;
|
|
my @reglines;
|
|
|
|
sub InRange {
|
|
my ($address, $target) = @_;
|
|
my $ad = "0x".$address;
|
|
my $ta = "0x".$target;
|
|
my $delta = Math::BigInt->from_hex($ad) - Math::BigInt->from_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, $cross_compile."objdump -dS --adjust-vma=$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)) {
|
|
$state = 1;
|
|
}
|
|
}
|
|
}
|
|
if ($state == 1) {
|
|
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 == -1) {
|
|
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;
|
|
|
|
|
|
# start annotating the registers in the asm.
|
|
# this goes from the oopsing point back, so that the annotator
|
|
# can track (opportunistically) which registers got written and
|
|
# whos value no longer is relevant.
|
|
|
|
$i = $center;
|
|
while ($i >= $start) {
|
|
$reglines[$i] = process_x86_regs($lines[$i], $center - $i);
|
|
$i = $i - 1;
|
|
}
|
|
|
|
$i = $start;
|
|
while ($i < $finish) {
|
|
my $line;
|
|
if ($i == $center) {
|
|
$line = "*$lines[$i] ";
|
|
} else {
|
|
$line = " $lines[$i] ";
|
|
}
|
|
print $line;
|
|
if (defined($reglines[$i]) && length($reglines[$i]) > 0) {
|
|
my $c = 60 - length($line);
|
|
while ($c > 0) { print " "; $c = $c - 1; };
|
|
print "| $reglines[$i]";
|
|
}
|
|
if ($i == $center) {
|
|
print "<--- faulting instruction";
|
|
}
|
|
print "\n";
|
|
$i = $i +1;
|
|
}
|
|
|
|
sub usage {
|
|
print <<EOT;
|
|
Usage:
|
|
dmesg | perl $0 [OPTION] [VMLINUX]
|
|
|
|
OPTION:
|
|
-c, --cross-compile CROSS_COMPILE Specify the prefix used for toolchain.
|
|
-m, --module MODULE_DIRNAME Specify the module filename.
|
|
-h, --help Help.
|
|
EOT
|
|
exit;
|
|
}
|