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2b6497ba84
The helper script needs updating to match latest busybox modprobe behavior in that all dependencies need to be listed, not just the immediate ones. Along the way, fix symbol prefixed ports, optimize the output, and add some more depmod compatible options. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
340 lines
9.2 KiB
Perl
Executable File
340 lines
9.2 KiB
Perl
Executable File
#!/usr/bin/perl -w
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# vi: set sw=4 ts=4:
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# Copyright (c) 2001 David Schleef <ds@schleef.org>
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# Copyright (c) 2001 Erik Andersen <andersen@codepoet.org>
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# Copyright (c) 2001 Stuart Hughes <seh@zee2.com>
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# Copyright (c) 2002 Steven J. Hill <shill@broadcom.com>
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# Copyright (c) 2006 Freescale Semiconductor, Inc <stuarth@freescale.com>
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#
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# History:
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# March 2006: Stuart Hughes <stuarth@freescale.com>.
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# Significant updates, including implementing the '-F' option
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# and adding support for 2.6 kernels.
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# This program is free software; you can redistribute it and/or modify it
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# under the same terms as Perl itself.
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use Getopt::Long qw(:config no_auto_abbrev no_ignore_case);
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use File::Find;
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use strict;
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# Set up some default values
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my $kdir="";
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my $basedir="";
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my $kernel="";
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my $kernelsyms="";
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my $symprefix="";
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my $all=0;
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my $quick=0;
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my $errsyms=0;
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my $stdout=0;
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my $verbose=0;
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my $help=0;
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my $nm = $ENV{'NM'} || "nm";
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# more globals
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my (@liblist) = ();
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my $exp = {};
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my $dep = {};
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my $mod = {};
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my $usage = <<TXT;
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$0 -b basedir { -k <vmlinux> | -F <System.map> } [options]...
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Where:
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-h --help : Show this help screen
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-b --basedir : Modules base directory (e.g /lib/modules/<2.x.y>)
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-k --kernel : Kernel binary for the target (e.g. vmlinux)
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-F --kernelsyms : Kernel symbol file (e.g. System.map)
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-n --stdout : Write to stdout instead of <basedir>/modules.dep
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-v --verbose : Print out lots of debugging stuff
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-P --symbol-prefix : Symbol prefix
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-a --all : Probe all modules (default/only thing supported)
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-e --errsyms : Report any symbols not supplied by modules/kernel
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TXT
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# get command-line options
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GetOptions(
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"help|h" => \$help,
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"basedir|b=s" => \$basedir,
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"kernel|k=s" => \$kernel,
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"kernelsyms|F=s" => \$kernelsyms,
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"stdout|n" => \$stdout,
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"verbose|v" => \$verbose,
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"symbol-prefix|P=s" => \$symprefix,
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"all|a" => \$all,
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# unsupported options
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"quick|A" => \$quick,
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# ignored options (for historical usage)
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"quiet|q",
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"root|r",
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"unresolved-error|u"
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);
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die $usage if $help;
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die $usage unless $basedir && ( $kernel || $kernelsyms );
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die "can't use both -k and -F\n\n$usage" if $kernel && $kernelsyms;
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die "sorry, -A/--quick is not supported" if $quick;
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die "--errsyms requires --kernelsyms" if $errsyms && !$kernelsyms;
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# Strip any trailing or multiple slashes from basedir
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$basedir =~ s-/+$--g;
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# The base directory should contain /lib/modules somewhere
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if($basedir !~ m-/lib/modules-) {
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warn "WARNING: base directory does not match ..../lib/modules\n";
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}
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# if no kernel version is contained in the basedir, try to find one
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if($basedir !~ m-/lib/modules/\d\.\d-) {
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opendir(BD, $basedir) or die "can't open basedir $basedir : $!\n";
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foreach ( readdir(BD) ) {
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next if /^\.\.?$/;
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next unless -d "$basedir/$_";
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warn "dir = $_\n" if $verbose;
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if( /^\d\.\d/ ) {
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$kdir = $_;
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warn("Guessed module directory as $basedir/$kdir\n");
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last;
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}
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}
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closedir(BD);
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die "Cannot find a kernel version under $basedir\n" unless $kdir;
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$basedir = "$basedir/$kdir";
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}
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# Find the list of .o or .ko files living under $basedir
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warn "**** Locating all modules\n" if $verbose;
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find sub {
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my $file;
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if ( -f $_ && ! -d $_ ) {
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$file = $File::Find::name;
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if ( $file =~ /\.k?o$/ ) {
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push(@liblist, $file);
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warn "$file\n" if $verbose;
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}
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}
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}, $basedir;
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warn "**** Finished locating modules\n" if $verbose;
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foreach my $obj ( @liblist ){
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# turn the input file name into a target tag name
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my ($tgtname) = $obj =~ m-(/lib/modules/.*)$-;
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warn "\nMODULE = $tgtname\n" if $verbose;
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# get a list of symbols
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my @output=`$nm $obj`;
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build_ref_tables($tgtname, \@output, $exp, $dep);
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}
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# vmlinux is a special name that is only used to resolve symbols
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my $tgtname = 'vmlinux';
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my @output = $kernelsyms ? `cat $kernelsyms` : `$nm $kernel`;
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warn "\nMODULE = $tgtname\n" if $verbose;
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build_ref_tables($tgtname, \@output, $exp, $dep);
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# resolve the dependencies for each module
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# reduce dependencies: remove unresolvable and resolved from vmlinux/System.map
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# remove duplicates
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foreach my $module (keys %$dep) {
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warn "reducing module: $module\n" if $verbose;
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$mod->{$module} = {};
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foreach (@{$dep->{$module}}) {
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if( $exp->{$_} ) {
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warn "resolved symbol $_ in file $exp->{$_}\n" if $verbose;
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next if $exp->{$_} =~ /vmlinux/;
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$mod->{$module}{$exp->{$_}} = 1;
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} else {
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warn "unresolved symbol $_ in file $module\n";
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}
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}
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}
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# build a complete dependency list for each module and make sure it
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# is kept in order proper order
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my $mod2 = {};
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sub maybe_unshift
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{
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my ($array, $ele) = @_;
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# chop off the leading path /lib/modules/<kver>/ as modprobe
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# will handle relative paths just fine
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$ele =~ s:^/lib/modules/[^/]*/::;
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foreach (@{$array}) {
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if ($_ eq $ele) {
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return;
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}
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}
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unshift (@{$array}, $ele);
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}
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foreach my $module (keys %$mod) {
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warn "filling out module: $module\n" if $verbose;
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@{$mod2->{$module}} = ();
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foreach my $md (keys %{$mod->{$module}}) {
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foreach my $md2 (keys %{$mod->{$md}}) {
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warn "outputting $md2\n" if $verbose;
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maybe_unshift (\@{$mod2->{$module}}, $md2);
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}
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warn "outputting $md\n" if $verbose;
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maybe_unshift (\@{$mod2->{$module}}, $md);
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}
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}
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# figure out where the output should go
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if ($stdout == 0) {
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open(STDOUT, ">$basedir/modules.dep")
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or die "cannot open $basedir/modules.dep: $!";
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}
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my $kseries = $basedir =~ m,/2\.6\.[^/]*, ? '2.6' : '2.4';
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foreach my $module ( keys %$mod ) {
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if($kseries eq '2.4') {
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print "$module:\t";
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my @sorted = sort bydep keys %{$mod->{$module}};
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print join(" \\\n\t",@sorted);
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print "\n\n";
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} else {
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my $shortmod = $module;
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$shortmod =~ s:^/lib/modules/[^/]*/::;
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print "$shortmod:";
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my @sorted = @{$mod2->{$module}};
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printf " " if @sorted;
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print join(" ",@sorted);
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print "\n";
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}
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}
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sub build_ref_tables
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{
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my ($name, $sym_ar, $exp, $dep) = @_;
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my $ksymtab = grep m/ ${symprefix}__ksymtab/, @$sym_ar;
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# gather the exported symbols
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if($ksymtab){
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# explicitly exported
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foreach ( @$sym_ar ) {
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/ ${symprefix}__ksymtab_(.*)$/ and do {
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my $sym = ${symprefix} . $1;
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warn "sym = $sym\n" if $verbose;
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$exp->{$sym} = $name;
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};
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}
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} else {
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# exporting all symbols
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foreach ( @$sym_ar ) {
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/ [ABCDGRSTW] (.*)$/ and do {
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warn "syma = $1\n" if $verbose;
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$exp->{$1} = $name;
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};
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}
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}
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# this takes makes sure modules with no dependencies get listed
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push @{$dep->{$name}}, $symprefix . 'printk' unless $name eq 'vmlinux';
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# gather the unresolved symbols
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foreach ( @$sym_ar ) {
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!/ ${symprefix}__this_module/ && / U (.*)$/ and do {
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warn "und = $1\n" if $verbose;
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push @{$dep->{$name}}, $1;
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};
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}
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}
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sub bydep
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{
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foreach my $f ( keys %{$mod->{$b}} ) {
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if($f eq $a) {
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return 1;
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}
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}
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return -1;
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}
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__END__
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=head1 NAME
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depmod.pl - a cross platform script to generate kernel module
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dependency lists (modules.conf) which can then be used by modprobe
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on the target platform.
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It supports Linux 2.4 and 2.6 styles of modules.conf (auto-detected)
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=head1 SYNOPSIS
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depmod.pl [OPTION]... [basedir]...
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Example:
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depmod.pl -F linux/System.map -b target/lib/modules/2.6.11
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=head1 DESCRIPTION
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The purpose of this script is to automagically generate a list of of kernel
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module dependencies. This script produces dependency lists that should be
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identical to the depmod program from the modutils package. Unlike the depmod
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binary, however, depmod.pl is designed to be run on your host system, not
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on your target system.
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This script was written by David Schleef <ds@schleef.org> to be used in
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conjunction with the BusyBox modprobe applet.
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=head1 OPTIONS
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=over 4
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=item B<-h --help>
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This displays the help message.
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=item B<-b --basedir>
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The base directory uner which the target's modules will be found. This
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defaults to the /lib/modules directory.
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If you don't specify the kernel version, this script will search for
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one under the specified based directory and use the first thing that
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looks like a kernel version.
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=item B<-k --kernel>
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Kernel binary for the target (vmlinux). You must either supply a kernel binary
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or a kernel symbol file (using the -F option).
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=item B<-F --kernelsyms>
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Kernel symbol file for the target (System.map).
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=item B<-n --stdout>
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Write to stdout instead of modules.dep
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kernel binary for the target (using the -k option).
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=item B<--verbose>
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Verbose (debug) output
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=back
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=head1 COPYRIGHT AND LICENSE
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Copyright (c) 2001 David Schleef <ds@schleef.org>
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Copyright (c) 2001 Erik Andersen <andersen@codepoet.org>
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Copyright (c) 2001 Stuart Hughes <seh@zee2.com>
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Copyright (c) 2002 Steven J. Hill <shill@broadcom.com>
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Copyright (c) 2006 Freescale Semiconductor, Inc <stuarth@freescale.com>
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This program is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 AUTHOR
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David Schleef <ds@schleef.org>
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=cut
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