Contents of /tags/mkinitrd-6_1_7/busybox/examples/depmod.pl
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Fri Oct 16 13:40:14 2009 UTC (14 years, 11 months ago) by niro
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tagged 'mkinitrd-6_1_7'
1 | #!/usr/bin/perl -w |
2 | # vi: set sw=4 ts=4: |
3 | # Copyright (c) 2001 David Schleef <ds@schleef.org> |
4 | # Copyright (c) 2001 Erik Andersen <andersen@codepoet.org> |
5 | # Copyright (c) 2001 Stuart Hughes <seh@zee2.com> |
6 | # Copyright (c) 2002 Steven J. Hill <shill@broadcom.com> |
7 | # Copyright (c) 2006 Freescale Semiconductor, Inc <stuarth@freescale.com> |
8 | # |
9 | # History: |
10 | # March 2006: Stuart Hughes <stuarth@freescale.com>. |
11 | # Significant updates, including implementing the '-F' option |
12 | # and adding support for 2.6 kernels. |
13 | |
14 | # This program is free software; you can redistribute it and/or modify it |
15 | # under the same terms as Perl itself. |
16 | use Getopt::Long; |
17 | use File::Find; |
18 | use strict; |
19 | |
20 | # Set up some default values |
21 | my $kdir=""; |
22 | my $basedir=""; |
23 | my $kernel=""; |
24 | my $kernelsyms=""; |
25 | my $symprefix=""; |
26 | my $stdout=0; |
27 | my $verbose=0; |
28 | my $help=0; |
29 | my $nm = $ENV{'NM'} || "nm"; |
30 | |
31 | # more globals |
32 | my (@liblist) = (); |
33 | my $exp = {}; |
34 | my $dep = {}; |
35 | my $mod = {}; |
36 | |
37 | my $usage = <<TXT; |
38 | $0 -b basedir { -k <vmlinux> | -F <System.map> } [options]... |
39 | Where: |
40 | -h --help : Show this help screen |
41 | -b --basedir : Modules base directory (e.g /lib/modules/<2.x.y>) |
42 | -k --kernel : Kernel binary for the target (e.g. vmlinux) |
43 | -F --kernelsyms : Kernel symbol file (e.g. System.map) |
44 | -n --stdout : Write to stdout instead of <basedir>/modules.dep |
45 | -v --verbose : Print out lots of debugging stuff |
46 | -P --symbol-prefix : Symbol prefix |
47 | TXT |
48 | |
49 | # get command-line options |
50 | GetOptions( |
51 | "help|h" => \$help, |
52 | "basedir|b=s" => \$basedir, |
53 | "kernel|k=s" => \$kernel, |
54 | "kernelsyms|F=s" => \$kernelsyms, |
55 | "stdout|n" => \$stdout, |
56 | "verbose|v" => \$verbose, |
57 | "symbol-prefix|P=s" => \$symprefix, |
58 | ); |
59 | |
60 | die $usage if $help; |
61 | die $usage unless $basedir && ( $kernel || $kernelsyms ); |
62 | die "can't use both -k and -F\n\n$usage" if $kernel && $kernelsyms; |
63 | |
64 | # Strip any trailing or multiple slashes from basedir |
65 | $basedir =~ s-(/)\1+-/-g; |
66 | |
67 | # The base directory should contain /lib/modules somewhere |
68 | if($basedir !~ m-/lib/modules-) { |
69 | warn "WARNING: base directory does not match ..../lib/modules\n"; |
70 | } |
71 | |
72 | # if no kernel version is contained in the basedir, try to find one |
73 | if($basedir !~ m-/lib/modules/\d\.\d-) { |
74 | opendir(BD, $basedir) or die "can't open basedir $basedir : $!\n"; |
75 | foreach ( readdir(BD) ) { |
76 | next if /^\.\.?$/; |
77 | next unless -d "$basedir/$_"; |
78 | warn "dir = $_\n" if $verbose; |
79 | if( /^\d\.\d/ ) { |
80 | $kdir = $_; |
81 | warn("Guessed module directory as $basedir/$kdir\n"); |
82 | last; |
83 | } |
84 | } |
85 | closedir(BD); |
86 | die "Cannot find a kernel version under $basedir\n" unless $kdir; |
87 | $basedir = "$basedir/$kdir"; |
88 | } |
89 | |
90 | # Find the list of .o or .ko files living under $basedir |
91 | warn "**** Locating all modules\n" if $verbose; |
92 | find sub { |
93 | my $file; |
94 | if ( -f $_ && ! -d $_ ) { |
95 | $file = $File::Find::name; |
96 | if ( $file =~ /\.k?o$/ ) { |
97 | push(@liblist, $file); |
98 | warn "$file\n" if $verbose; |
99 | } |
100 | } |
101 | }, $basedir; |
102 | warn "**** Finished locating modules\n" if $verbose; |
103 | |
104 | foreach my $obj ( @liblist ){ |
105 | # turn the input file name into a target tag name |
106 | my ($tgtname) = $obj =~ m-(/lib/modules/.*)$-; |
107 | |
108 | warn "\nMODULE = $tgtname\n" if $verbose; |
109 | |
110 | # get a list of symbols |
111 | my @output=`$nm $obj`; |
112 | |
113 | build_ref_tables($tgtname, \@output, $exp, $dep); |
114 | } |
115 | |
116 | |
117 | # vmlinux is a special name that is only used to resolve symbols |
118 | my $tgtname = 'vmlinux'; |
119 | my @output = $kernelsyms ? `cat $kernelsyms` : `$nm $kernel`; |
120 | warn "\nMODULE = $tgtname\n" if $verbose; |
121 | build_ref_tables($tgtname, \@output, $exp, $dep); |
122 | |
123 | # resolve the dependencies for each module |
124 | # reduce dependencies: remove unresolvable and resolved from vmlinux/System.map |
125 | # remove duplicates |
126 | foreach my $module (keys %$dep) { |
127 | warn "reducing module: $module\n" if $verbose; |
128 | $mod->{$module} = {}; |
129 | foreach (@{$dep->{$module}}) { |
130 | if( $exp->{$_} ) { |
131 | warn "resolved symbol $_ in file $exp->{$_}\n" if $verbose; |
132 | next if $exp->{$_} =~ /vmlinux/; |
133 | $mod->{$module}{$exp->{$_}} = 1; |
134 | } else { |
135 | warn "unresolved symbol $_ in file $module\n"; |
136 | } |
137 | } |
138 | } |
139 | |
140 | # figure out where the output should go |
141 | if ($stdout == 0) { |
142 | open(STDOUT, ">$basedir/modules.dep") |
143 | or die "cannot open $basedir/modules.dep: $!"; |
144 | } |
145 | my $kseries = $basedir =~ m,/2\.6\.[^/]*, ? '2.6' : '2.4'; |
146 | |
147 | foreach my $module ( keys %$mod ) { |
148 | if($kseries eq '2.4') { |
149 | print "$module:\t"; |
150 | my @sorted = sort bydep keys %{$mod->{$module}}; |
151 | print join(" \\\n\t",@sorted); |
152 | print "\n\n"; |
153 | } else { |
154 | print "$module: "; |
155 | my @sorted = sort bydep keys %{$mod->{$module}}; |
156 | print join(" ",@sorted); |
157 | print "\n"; |
158 | } |
159 | } |
160 | |
161 | |
162 | sub build_ref_tables |
163 | { |
164 | my ($name, $sym_ar, $exp, $dep) = @_; |
165 | |
166 | my $ksymtab = grep m/ __ksymtab/, @$sym_ar; |
167 | |
168 | # gather the exported symbols |
169 | if($ksymtab){ |
170 | # explicitly exported |
171 | foreach ( @$sym_ar ) { |
172 | / __ksymtab_(.*)$/ and do { |
173 | warn "sym = $1\n" if $verbose; |
174 | $exp->{$1} = $name; |
175 | }; |
176 | } |
177 | } else { |
178 | # exporting all symbols |
179 | foreach ( @$sym_ar ) { |
180 | / [ABCDGRSTW] (.*)$/ and do { |
181 | warn "syma = $1\n" if $verbose; |
182 | $exp->{$1} = $name; |
183 | }; |
184 | } |
185 | } |
186 | |
187 | # this takes makes sure modules with no dependencies get listed |
188 | push @{$dep->{$name}}, $symprefix . 'printk' unless $name eq 'vmlinux'; |
189 | |
190 | # gather the unresolved symbols |
191 | foreach ( @$sym_ar ) { |
192 | !/ __this_module/ && / U (.*)$/ and do { |
193 | warn "und = $1\n" if $verbose; |
194 | push @{$dep->{$name}}, $1; |
195 | }; |
196 | } |
197 | } |
198 | |
199 | sub bydep |
200 | { |
201 | foreach my $f ( keys %{$mod->{$b}} ) { |
202 | if($f eq $a) { |
203 | return 1; |
204 | } |
205 | } |
206 | return -1; |
207 | } |
208 | |
209 | |
210 | |
211 | __END__ |
212 | |
213 | =head1 NAME |
214 | |
215 | depmod.pl - a cross platform script to generate kernel module |
216 | dependency lists (modules.conf) which can then be used by modprobe |
217 | on the target platform. |
218 | |
219 | It supports Linux 2.4 and 2.6 styles of modules.conf (auto-detected) |
220 | |
221 | =head1 SYNOPSIS |
222 | |
223 | depmod.pl [OPTION]... [basedir]... |
224 | |
225 | Example: |
226 | |
227 | depmod.pl -F linux/System.map -b target/lib/modules/2.6.11 |
228 | |
229 | =head1 DESCRIPTION |
230 | |
231 | The purpose of this script is to automagically generate a list of of kernel |
232 | module dependencies. This script produces dependency lists that should be |
233 | identical to the depmod program from the modutils package. Unlike the depmod |
234 | binary, however, depmod.pl is designed to be run on your host system, not |
235 | on your target system. |
236 | |
237 | This script was written by David Schleef <ds@schleef.org> to be used in |
238 | conjunction with the BusyBox modprobe applet. |
239 | |
240 | =head1 OPTIONS |
241 | |
242 | =over 4 |
243 | |
244 | =item B<-h --help> |
245 | |
246 | This displays the help message. |
247 | |
248 | =item B<-b --basedir> |
249 | |
250 | The base directory uner which the target's modules will be found. This |
251 | defaults to the /lib/modules directory. |
252 | |
253 | If you don't specify the kernel version, this script will search for |
254 | one under the specified based directory and use the first thing that |
255 | looks like a kernel version. |
256 | |
257 | =item B<-k --kernel> |
258 | |
259 | Kernel binary for the target (vmlinux). You must either supply a kernel binary |
260 | or a kernel symbol file (using the -F option). |
261 | |
262 | =item B<-F --kernelsyms> |
263 | |
264 | Kernel symbol file for the target (System.map). |
265 | |
266 | =item B<-n --stdout> |
267 | |
268 | Write to stdout instead of modules.dep |
269 | kernel binary for the target (using the -k option). |
270 | |
271 | =item B<--verbose> |
272 | |
273 | Verbose (debug) output |
274 | |
275 | =back |
276 | |
277 | =head1 COPYRIGHT AND LICENSE |
278 | |
279 | Copyright (c) 2001 David Schleef <ds@schleef.org> |
280 | Copyright (c) 2001 Erik Andersen <andersen@codepoet.org> |
281 | Copyright (c) 2001 Stuart Hughes <seh@zee2.com> |
282 | Copyright (c) 2002 Steven J. Hill <shill@broadcom.com> |
283 | Copyright (c) 2006 Freescale Semiconductor, Inc <stuarth@freescale.com> |
284 | |
285 | This program is free software; you can redistribute it and/or modify it |
286 | under the same terms as Perl itself. |
287 | |
288 | =head1 AUTHOR |
289 | |
290 | David Schleef <ds@schleef.org> |
291 | |
292 | =cut |
Properties
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svn:executable | * |