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