This depmod script will create a modules.dep file, just like the depmod

binary from modutils.  This one, however, can be run on the _host_
system (need not be run on the target) and is fully cross platform, so
even if your target is ARM or powerpc or whatever, this will still
work.  When used to support the new modprobe applet, this allows
busybox to fully supplant modutils for architectures supported by
busybox insmod.
 -Erik

1 files changed, 227 insertions, 0 deletions

diff --git a/examples/depmod.pl b/examples/depmod.pl
new file mode 100755
index 0000000..e65f07b
--- /dev/null
+++ b/examples/depmod.pl
@@ -0,0 +1,227 @@
+#!/usr/bin/perl -w
+# vi: set ts=4:
+# Copyright (c) 2001 David Schleef <ds@schleef.org>
+# Copyright (c) 2001 Erik Andersen <andersen@lineo.com>
+# Copyright (c) 2001 Stuart Hughes <stuarth@lineo.com>
+# This program is free software; you can redistribute it and/or modify it 
+# under the same terms as Perl itself.
+
+# TODO -- use strict mode...
+#use strict;
+
+use Getopt::Long;
+use File::Find;
+
+
+# Set up some default values
+
+my $basedir="";
+my $kernel;
+my $kernelsyms;
+my $stdout=1;
+my $verbose=0;
+
+
+# get command-line options
+
+my %opt;
+
+GetOptions(
+	\%opt,
+	"help|h",
+	"basedir|b=s" => \$basedir,
+	"kernel|k=s" => \$kernel,
+	"kernelsyms|F=s" => \$kernelsyms,
+	"stdout|n" => \$stdout,
+	"verbose|v" => \$verbose,
+);
+
+if (defined $opt{help}) {
+	print
+		"$0 [OPTION]... [basedir]\n",
+		"\t-h --help\t\tShow this help screen\n",
+		"\t-b --basedir\t\tModules base directory (defaults to /lib/modules)\n",
+		"\t-k --kernel\t\tKernel binary for the target\n",
+		"\t-F --kernelsyms\t\tKernel symbol file\n",
+		"\t-n --stdout\t\tWrite to stdout instead of modules.dep\n",
+		"\t-v --verbose\t\tPrint out lots of debugging stuff\n",
+	;
+	exit 1;
+}
+
+if($basedir !~ m-/lib/modules-) {
+    warn "WARNING: base directory does not match ..../lib/modules\n";
+}
+
+# Find the list of .o files living under $basedir 
+#if ($verbose) { printf "Locating all modules\n"; }
+my($file) = "";
+my(@liblist) = ();
+find sub { 
+	if ( -f $_  && ! -d $_ ) { 
+		$file = $File::Find::name;
+		if ( $file =~ /.o$/ ) {
+			push(@liblist, $file);
+			if ($verbose) { printf "$file\n"; }
+		}
+	}
+}, $basedir;
+if ($verbose) { printf "Finished locating modules\n"; }
+
+foreach $obj ( @liblist, $kernel ){
+    # turn the input file name into a target tag name
+    # vmlinux is a special that is only used to resolve symbols
+    if($obj =~ /vmlinux/) {
+        $tgtname = "vmlinux";
+    } else {
+        ($tgtname) = $obj =~ m-(/lib/modules/.*)$-;
+    }
+
+    warn "MODULE = $tgtname\n" if $verbose;
+
+    # get a list of symbols
+	@output=`nm $obj`;
+	$ksymtab=grep m/ __ksymtab/, @output;
+
+    # gather the exported symbols
+	if($ksymtab){
+        # explicitly exported
+        foreach ( @output ) {
+            / __ksymtab_(.*)$/ and do {
+                warn "sym = $1\n" if $verbose;
+                $exp->{$1} = $tgtname;
+            };
+        }
+	} else {
+        # exporting all symbols
+        foreach ( @output) {
+            / [ABCDGRST] (.*)$/ and do {
+                warn "syma = $1\n" if $verbose;
+                $exp->{$1} = $tgtname;
+            };
+        }
+	}
+    # gather the unresolved symbols
+    foreach ( @output ) {
+        !/ __this_module/ && / U (.*)$/ and do {
+            warn "und = $1\n" if $verbose;
+            push @{$dep->{$tgtname}}, $1;
+        };
+    }
+}
+
+
+# reduce dependancies: remove unresolvable and resolved from vmlinux
+# remove duplicates
+foreach $module (keys %$dep) {
+    $mod->{$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";
+        }
+    } 
+}
+
+# resolve the dependancies for each module
+foreach $module ( keys %$mod )  {
+    print "$module:\t";
+    @sorted = sort bydep keys %{$mod->{$module}};
+    print join(" \\\n\t",@sorted);
+#    foreach $m (@sorted ) {
+#        print "\t$m\n";
+#    }
+    print "\n\n";
+}
+
+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 which can then be used by modprobe.
+
+=head1 SYNOPSIS
+
+depmod.pl [OPTION]... [FILE]...
+
+Example:
+
+	depmod.pl -F linux/System.map target/lib/modules
+
+=head1 DESCRIPTION
+
+The purpose of this script is to automagically generate a list of of kernel
+module dependancies.  This script produces dependancy 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 <ds@schleef.org> 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.
+
+=item B<-k --kernel>
+
+Kernel binary for the target.  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.  You must supply either a kernel symbol file
+kernel binary for the target (using the -k option).
+
+=item B<-n --stdout>
+
+Write to stdout instead of modules.dep.  This is currently hard coded...
+kernel binary for the target (using the -k option).
+
+=item B<--verbose>
+
+Be verbose (not implemented)
+
+=back
+
+=head1 COPYRIGHT
+
+Copyright (c) 2001 David Schleef <ds@schleef.org>
+Copyright (c) 2001 Erik Andersen <andersen@lineo.com>
+Copyright (c) 2001 Stuart Hughes <stuarth@lineo.com>
+This program is free software; you can redistribute it and/or modify it 
+under the same terms as Perl itself.
+
+=head1 AUTHOR
+
+David Schleef <ds@schleef.org>
+
+=cut
+
+# $Id: depmod.pl,v 1.1 2001/07/30 19:32:03 andersen Exp $
+