Gecko [ www.jobworksschool.com ]

Name	Size	Permission	Date
atomic	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
basic	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
clang-tools	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
coccinelle	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
dtc	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
dummy-tools	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
gcc-plugins	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
gdb	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
genksyms	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
kconfig	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
ksymoops	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
mod	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
package	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
selinux	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
tracing	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
Kbuild.include	10.1 KB	-rw-r--r--	2024-03-10 20:38
Kconfig.include	2.65 KB	-rw-r--r--	2026-05-26 09:55
Lindent	502 B	-rwxr-xr-x	2024-03-10 20:38
Makefile	1.87 KB	-rw-r--r--	2024-03-10 20:38
Makefile.asm-generic	1.82 KB	-rw-r--r--	2024-03-10 20:38
Makefile.btf	638 B	-rw-r--r--	2024-03-10 20:38
Makefile.build	17.24 KB	-rw-r--r--	2026-05-26 09:55
Makefile.clang	1.61 KB	-rw-r--r--	2024-03-10 20:38
Makefile.clean	1.87 KB	-rw-r--r--	2024-03-10 20:38
Makefile.compiler	2.74 KB	-rw-r--r--	2024-03-10 20:38
Makefile.debug	1.12 KB	-rw-r--r--	2024-03-10 20:38
Makefile.defconf	1.04 KB	-rw-r--r--	2026-05-26 09:55
Makefile.dtbinst	1.03 KB	-rw-r--r--	2026-05-26 09:55
Makefile.extrawarn	7.9 KB	-rw-r--r--	2026-05-26 09:55
Makefile.gcc-plugins	2.59 KB	-rw-r--r--	2024-03-10 20:38
Makefile.headersinst	2.88 KB	-rw-r--r--	2024-03-10 20:38
Makefile.host	5.91 KB	-rw-r--r--	2024-03-10 20:38
Makefile.kasan	2.57 KB	-rw-r--r--	2026-05-26 09:55
Makefile.kcov	333 B	-rw-r--r--	2024-03-10 20:38
Makefile.kcsan	1004 B	-rw-r--r--	2024-03-10 20:38
Makefile.kmsan	208 B	-rw-r--r--	2024-03-10 20:38
Makefile.lib	21.12 KB	-rw-r--r--	2026-05-26 09:55
Makefile.modfinal	2.63 KB	-rw-r--r--	2026-05-26 09:55
Makefile.modinst	4.02 KB	-rw-r--r--	2026-05-26 09:55
Makefile.modpost	4.69 KB	-rw-r--r--	2024-03-10 20:38
Makefile.package	8.73 KB	-rw-r--r--	2026-05-26 09:55
Makefile.randstruct	511 B	-rw-r--r--	2024-03-10 20:38
Makefile.ubsan	779 B	-rw-r--r--	2024-03-10 20:38
Makefile.userprogs	1.59 KB	-rw-r--r--	2024-03-10 20:38
Makefile.vdsoinst	1.15 KB	-rw-r--r--	2026-05-26 09:55
Makefile.vmlinux	1.48 KB	-rw-r--r--	2024-03-10 20:38
Makefile.vmlinux_o	3.27 KB	-rw-r--r--	2024-03-10 20:38
as-version.sh	2.03 KB	-rwxr-xr-x	2024-03-10 20:38
asn1_compiler	34.3 KB	-rwxr-xr-x	2026-05-26 09:55
asn1_compiler.c	35.32 KB	-rw-r--r--	2024-03-10 20:38
bloat-o-meter	3.77 KB	-rwxr-xr-x	2024-03-10 20:38
bootgraph.pl	5.64 KB	-rwxr-xr-x	2024-03-10 20:38
bpf_doc.py	31.73 KB	-rwxr-xr-x	2026-05-26 09:55
cc-can-link.sh	166 B	-rwxr-xr-x	2024-03-10 20:38
cc-version.sh	1.36 KB	-rwxr-xr-x	2024-03-10 20:38
check-git	298 B	-rwxr-xr-x	2024-03-10 20:38
check-sysctl-docs	3.66 KB	-rwxr-xr-x	2024-03-10 20:38
check-uapi.sh	15.05 KB	-rwxr-xr-x	2024-03-10 20:38
check_extable.sh	4.93 KB	-rwxr-xr-x	2024-03-10 20:38
checkdeclares.pl	1.1 KB	-rwxr-xr-x	2024-03-10 20:38
checkincludes.pl	1.94 KB	-rwxr-xr-x	2024-03-10 20:38
checkkconfigsymbols.py	15.75 KB	-rwxr-xr-x	2024-03-10 20:38
checkpatch.pl	233.78 KB	-rwxr-xr-x	2026-05-26 09:55
checkstack.pl	5.96 KB	-rwxr-xr-x	2024-03-10 20:38
checksyscalls.sh	7.51 KB	-rwxr-xr-x	2024-03-10 20:38
checkversion.pl	2.16 KB	-rwxr-xr-x	2024-03-10 20:38
cleanfile	3.46 KB	-rwxr-xr-x	2024-03-10 20:38
cleanpatch	5.06 KB	-rwxr-xr-x	2024-03-10 20:38
coccicheck	7.9 KB	-rwxr-xr-x	2024-03-10 20:38
config	4.78 KB	-rwxr-xr-x	2026-05-26 09:55
const_structs.checkpatch	1.4 KB	-rw-r--r--	2024-03-10 20:38
decode_stacktrace.sh	7.58 KB	-rwxr-xr-x	2024-03-10 20:38
decodecode	4.86 KB	-rwxr-xr-x	2024-03-10 20:38
depmod.sh	697 B	-rwxr-xr-x	2024-03-10 20:38
dev-needs.sh	6.07 KB	-rwxr-xr-x	2024-03-10 20:38
diffconfig	4.12 KB	-rwxr-xr-x	2024-03-10 20:38
documentation-file-ref-check	5.67 KB	-rwxr-xr-x	2024-03-10 20:38
export_report.pl	4.5 KB	-rwxr-xr-x	2026-05-26 09:55
extract-ikconfig	1.74 KB	-rwxr-xr-x	2024-03-10 20:38
extract-module-sig.pl	3.66 KB	-rwxr-xr-x	2024-03-10 20:38
extract-sys-certs.pl	3.75 KB	-rwxr-xr-x	2024-03-10 20:38
extract-vmlinux	1.66 KB	-rwxr-xr-x	2024-03-10 20:38
extract_xc3028.pl	44.62 KB	-rwxr-xr-x	2024-03-10 20:38
faddr2line	8.63 KB	-rwxr-xr-x	2024-03-10 20:38
file-size.sh	86 B	-rwxr-xr-x	2024-03-10 20:38
find-unused-docs.sh	1.27 KB	-rwxr-xr-x	2024-03-10 20:38
gcc-x86_32-has-stack-protector.sh	405 B	-rwxr-xr-x	2026-05-26 09:55
gcc-x86_64-has-stack-protector.sh	195 B	-rwxr-xr-x	2026-05-26 09:55
gen-randstruct-seed.sh	228 B	-rwxr-xr-x	2024-03-10 20:38
generate_initcall_order.pl	5.95 KB	-rwxr-xr-x	2024-03-10 20:38
generate_rust_analyzer.py	5.54 KB	-rwxr-xr-x	2026-05-26 09:55
generate_rust_target	505.09 KB	-rwxr-xr-x	2026-05-26 09:55
generate_rust_target.rs	5.59 KB	-rw-r--r--	2026-05-26 09:55
get_abi.pl	25.36 KB	-rwxr-xr-x	2024-03-10 20:38
get_dvb_firmware	24.54 KB	-rwxr-xr-x	2024-03-10 20:38
get_feat.pl	14.61 KB	-rwxr-xr-x	2024-03-10 20:38
get_maintainer.pl	67.63 KB	-rwxr-xr-x	2024-03-10 20:38
gfp-translate	2.08 KB	-rwxr-xr-x	2026-05-26 09:55
git.orderFile	564 B	-rw-r--r--	2024-03-10 20:38
head-object-list.txt	1.36 KB	-rw-r--r--	2024-03-10 20:38
headerdep.pl	3.5 KB	-rwxr-xr-x	2024-03-10 20:38
headers_install.sh	2.76 KB	-rwxr-xr-x	2024-03-10 20:38
insert-sys-cert	21.59 KB	-rwxr-xr-x	2026-05-26 09:55
insert-sys-cert.c	13.08 KB	-rw-r--r--	2026-05-26 09:55
install.sh	986 B	-rwxr-xr-x	2024-03-10 20:38
jobserver-exec	2.56 KB	-rwxr-xr-x	2024-03-10 20:38
kallsyms	21.71 KB	-rwxr-xr-x	2026-05-26 09:55
kallsyms.c	17.75 KB	-rw-r--r--	2026-05-26 09:55
kernel-doc	77.13 KB	-rwxr-xr-x	2026-05-26 09:55
ld-version.sh	1.82 KB	-rwxr-xr-x	2026-05-26 09:55
leaking_addresses.pl	12.84 KB	-rwxr-xr-x	2024-03-10 20:38
link-vmlinux.sh	7.66 KB	-rwxr-xr-x	2026-05-26 09:55
makelst	808 B	-rwxr-xr-x	2024-03-10 20:38
markup_oops.pl	7.92 KB	-rwxr-xr-x	2024-03-10 20:38
min-tool-version.sh	630 B	-rwxr-xr-x	2026-05-26 09:55
misc-check	509 B	-rwxr-xr-x	2024-03-10 20:38
mkcompile_h	642 B	-rwxr-xr-x	2024-03-10 20:38
mksysmap	2.08 KB	-rwxr-xr-x	2026-05-26 09:55
mkuboot.sh	414 B	-rwxr-xr-x	2024-03-10 20:38
module.lds	615 B	-rw-r--r--	2026-05-26 09:55
module.lds.S	1.43 KB	-rw-r--r--	2026-05-26 09:55
modules-check.sh	443 B	-rwxr-xr-x	2024-03-10 20:38
nsdeps	1.63 KB	-rw-r--r--	2024-03-10 20:38
objdiff	2.83 KB	-rwxr-xr-x	2024-03-10 20:38
objdump-func	848 B	-rwxr-xr-x	2024-03-10 20:38
orc_hash.sh	316 B	-rw-r--r--	2024-03-10 20:38
pahole-version.sh	269 B	-rwxr-xr-x	2024-03-10 20:38
parse-maintainers.pl	4.54 KB	-rwxr-xr-x	2024-03-10 20:38
patch-kernel	9.95 KB	-rwxr-xr-x	2024-03-10 20:38
profile2linkerlist.pl	414 B	-rwxr-xr-x	2024-03-10 20:38
prune-kernel	912 B	-rwxr-xr-x	2024-03-10 20:38
recordmcount.c	17.51 KB	-rw-r--r--	2024-03-10 20:38
recordmcount.h	19.37 KB	-rw-r--r--	2024-03-10 20:38
recordmcount.pl	17.34 KB	-rwxr-xr-x	2024-03-10 20:38
relocs_check.sh	717 B	-rwxr-xr-x	2024-03-10 20:38
remove-stale-files	1.29 KB	-rwxr-xr-x	2024-03-10 20:38
rust_is_available.sh	9.48 KB	-rwxr-xr-x	2026-05-26 09:55
rust_is_available_bindgen_libclang.h	91 B	-rw-r--r--	2024-03-10 20:38
rust_is_available_test.py	17.7 KB	-rwxr-xr-x	2024-03-10 20:38
rustdoc_test_builder.rs	3.25 KB	-rw-r--r--	2024-03-10 20:38
rustdoc_test_gen.rs	9.48 KB	-rw-r--r--	2024-03-10 20:38
setlocalversion	5.18 KB	-rwxr-xr-x	2026-05-26 09:55
show_delta	3.04 KB	-rwxr-xr-x	2024-03-10 20:38
sign-file	26.05 KB	-rwxr-xr-x	2026-05-26 09:55
sign-file.c	10.4 KB	-rw-r--r--	2026-05-26 09:55
sorttable	21.3 KB	-rwxr-xr-x	2026-05-26 09:55
sorttable.c	7.68 KB	-rw-r--r--	2024-03-10 20:38
sorttable.h	12.99 KB	-rw-r--r--	2026-05-26 09:55
spdxcheck-test.sh	284 B	-rw-r--r--	2024-03-10 20:38
spdxcheck.py	15.23 KB	-rwxr-xr-x	2024-03-10 20:38
spdxexclude	417 B	-rw-r--r--	2024-03-10 20:38
spelling.txt	34.18 KB	-rw-r--r--	2024-03-10 20:38
sphinx-pre-install	25.07 KB	-rwxr-xr-x	2024-03-10 20:38
split-man.pl	604 B	-rwxr-xr-x	2024-03-10 20:38
ssl-common.h	678 B	-rw-r--r--	2026-05-26 09:55
stackdelta	1.84 KB	-rwxr-xr-x	2024-03-10 20:38
stackusage	794 B	-rwxr-xr-x	2024-03-10 20:38
subarch.include	647 B	-rw-r--r--	2024-03-10 20:38
syscallhdr.sh	1.89 KB	-rwxr-xr-x	2024-03-10 20:38
syscallnr.sh	1.45 KB	-rwxr-xr-x	2024-03-10 20:38
syscalltbl.sh	1.82 KB	-rwxr-xr-x	2026-05-26 09:55
tags.sh	10.73 KB	-rwxr-xr-x	2024-03-10 20:38
target.json	376 B	-rw-r--r--	2026-05-26 09:55
test_fortify.sh	2.23 KB	-rw-r--r--	2024-03-10 20:38
tools-support-relr.sh	726 B	-rwxr-xr-x	2024-03-10 20:38
unifdef.c	34.8 KB	-rw-r--r--	2024-03-10 20:38
ver_linux	2.59 KB	-rwxr-xr-x	2024-03-10 20:38
xen-hypercalls.sh	386 B	-rwxr-xr-x	2024-03-10 20:38
xz_wrap.sh	516 B	-rwxr-xr-x	2024-03-10 20:38

Rename

#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0-only

use File::Basename;
use Math::BigInt;
use Getopt::Long;

# Copyright 2008, Intel Corporation
#
# This file is part of the Linux kernel
#
# 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;
}