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