Linux ip-172-26-7-228 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64
Your IP : 3.133.153.110
#!/usr/bin/env perl
# ----------------------------------------------------------------------
# mkknlimg by Phil Elwell for Raspberry Pi
# based on extract-ikconfig by Dick Streefland
#
# (c) 2009,2010 Dick Streefland <dick@streefland.net>
# (c) 2014,2015 Raspberry Pi (Trading) Limited <info@raspberrypi.org>
#
# Licensed under the terms of the GNU General Public License.
# ----------------------------------------------------------------------
use strict;
use warnings;
use integer;
use constant FLAG_PI => 0x01;
use constant FLAG_DTOK => 0x02;
use constant FLAG_DDTK => 0x04;
use constant FLAG_270X => 0x08;
use constant FLAG_283X => 0x10;
my $trailer_magic = 'RPTL';
my $tmpfile1 = "/tmp/mkknlimg_$$.1";
my $tmpfile2 = "/tmp/mkknlimg_$$.2";
my $dtok = 0;
my $ddtk = 0;
my $is_270x = 0;
my $is_283x = 0;
while (@ARGV && ($ARGV[0] =~ /^-/))
{
my $arg = shift(@ARGV);
if ($arg eq '--dtok')
{
$dtok = 1;
}
elsif ($arg eq '--ddtk')
{
$ddtk = 1;
}
elsif ($arg eq '--270x')
{
$is_270x = 1;
}
elsif ($arg eq '--283x')
{
$is_283x = 1;
}
else
{
print ("* Unknown option '$arg'\n");
usage();
}
}
usage() if (@ARGV != 2);
my $kernel_file = $ARGV[0];
my $out_file = $ARGV[1];
if (! -r $kernel_file)
{
print ("* File '$kernel_file' not found\n");
usage();
}
my $wanted_strings =
{
'bcm2708_fb' => FLAG_PI,
'brcm,bcm2835-mmc' => FLAG_PI,
'brcm,bcm2835-sdhost' => FLAG_PI,
'brcm,bcm2708-pinctrl' => FLAG_PI | FLAG_DTOK,
'brcm,bcm2835-gpio' => FLAG_PI | FLAG_DTOK,
'brcm,bcm2708' => FLAG_PI | FLAG_DTOK | FLAG_270X,
'brcm,bcm2709' => FLAG_PI | FLAG_DTOK | FLAG_270X,
'brcm,bcm2835' => FLAG_PI | FLAG_DTOK | FLAG_283X,
'brcm,bcm2836' => FLAG_PI | FLAG_DTOK | FLAG_283X,
'of_overlay_apply' => FLAG_DTOK | FLAG_DDTK,
};
my $res = try_extract($kernel_file, $tmpfile1);
$res ||= try_decompress('\037\213\010', 'xy', 'gunzip', 0,
$kernel_file, $tmpfile1, $tmpfile2);
$res ||= try_decompress('\3757zXZ\000', 'abcde', 'unxz --single-stream', -1,
$kernel_file, $tmpfile1, $tmpfile2);
$res ||= try_decompress('BZh', 'xy', 'bunzip2', 0,
$kernel_file, $tmpfile1, $tmpfile2);
$res ||= try_decompress('\135\0\0\0', 'xxx', 'unlzma', 0,
$kernel_file, $tmpfile1, $tmpfile2);
$res ||= try_decompress('\211\114\132', 'xy', 'lzop -d', 0,
$kernel_file, $tmpfile1, $tmpfile2);
$res ||= try_decompress('\002\041\114\030', 'xy', 'lz4 -d', 1,
$kernel_file, $tmpfile1, $tmpfile2);
my $append_trailer;
my $trailer;
my $kver = '?';
$append_trailer = $dtok;
if ($res)
{
$kver = $res->{'kver'} || '?';
my $flags = $res->{'flags'};
print("Version: $kver\n");
if ($flags & FLAG_PI)
{
$append_trailer = 1;
$dtok ||= ($flags & FLAG_DTOK) != 0;
$is_270x ||= ($flags & FLAG_270X) != 0;
$is_283x ||= ($flags & FLAG_283X) != 0;
$ddtk ||= ($flags & FLAG_DDTK) != 0;
}
else
{
print ("* This doesn't look like a Raspberry Pi kernel. In pass-through mode.\n");
}
}
elsif (!$dtok)
{
print ("* Is this a valid kernel? In pass-through mode.\n");
}
if ($append_trailer)
{
printf("DT: %s\n", $dtok ? "y" : "n");
printf("DDT: %s\n", $ddtk ? "y" : "n") if ($ddtk);
printf("270x: %s\n", $is_270x ? "y" : "n");
printf("283x: %s\n", $is_283x ? "y" : "n");
my @atoms;
push @atoms, [ $trailer_magic, pack('V', 0) ];
push @atoms, [ 'KVer', $kver ];
push @atoms, [ 'DTOK', pack('V', $dtok) ];
push @atoms, [ 'DDTK', pack('V', $ddtk) ] if ($ddtk);
push @atoms, [ '270X', pack('V', $is_270x) ];
push @atoms, [ '283X', pack('V', $is_283x) ];
push @atoms, [ '283x', pack('V', $is_283x && !$is_270x) ];
$trailer = pack_trailer(\@atoms);
$atoms[0]->[1] = pack('V', length($trailer));
$trailer = pack_trailer(\@atoms);
}
my $ofh;
my $total_len = 0;
if ($out_file eq $kernel_file)
{
die "* Failed to open '$out_file' for append\n"
if (!open($ofh, '>>', $out_file));
$total_len = tell($ofh);
}
else
{
die "* Failed to open '$kernel_file'\n"
if (!open(my $ifh, '<', $kernel_file));
die "* Failed to create '$out_file'\n"
if (!open($ofh, '>', $out_file));
my $copybuf;
while (1)
{
my $bytes = sysread($ifh, $copybuf, 64*1024);
last if (!$bytes);
syswrite($ofh, $copybuf, $bytes);
$total_len += $bytes;
}
close($ifh);
}
if ($trailer)
{
# Pad to word-alignment
syswrite($ofh, "\x000\x000\x000", (-$total_len & 0x3));
syswrite($ofh, $trailer);
}
close($ofh);
exit($trailer ? 0 : 1);
END {
unlink($tmpfile1) if ($tmpfile1);
unlink($tmpfile2) if ($tmpfile2);
}
sub usage
{
print ("Usage: mkknlimg [--dtok] [--270x] [--283x] <vmlinux|zImage|bzImage> <outfile>\n");
exit(1);
}
sub try_extract
{
my ($knl, $tmp) = @_;
my $ver = `strings "$knl" | grep -a -E "^Linux version [1-9]"`;
return undef if (!$ver);
chomp($ver);
my $res = { 'kver'=>$ver };
$res->{'flags'} = strings_to_flags($knl, $wanted_strings);
return $res;
}
sub try_decompress
{
my ($magic, $subst, $zcat, $idx, $knl, $tmp1, $tmp2) = @_;
my $pos = `tr "$magic\n$subst" "\n$subst=" < "$knl" | grep -abo "^$subst"`;
if ($pos)
{
chomp($pos);
$pos = (split(/[\r\n]+/, $pos))[$idx];
return undef if (!defined($pos));
$pos =~ s/:.*[\r\n]*$//s;
my $cmd = "tail -c+$pos \"$knl\" | $zcat > $tmp2 2> /dev/null";
my $err = (system($cmd) >> 8);
return undef if (($err != 0) && ($err != 2));
return try_extract($tmp2, $tmp1);
}
return undef;
}
sub strings_to_flags
{
my ($knl, $strings) = @_;
my $string_pattern = '^('.join('|', keys(%$strings)).')$';
my $flags = 0;
my @matches = `strings \"$knl\" | grep -E \"$string_pattern\"`;
foreach my $match (@matches)
{
chomp($match);
$flags |= $strings->{$match};
}
return $flags;
}
sub pack_trailer
{
my ($atoms) = @_;
my $trailer = pack('VV', 0, 0);
for (my $i = $#$atoms; $i>=0; $i--)
{
my $atom = $atoms->[$i];
$trailer .= pack('a*x!4Va4', $atom->[1], length($atom->[1]), $atom->[0]);
}
return $trailer;
}
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