scripts/headers_install.pl

   1 #!/usr/bin/perl -w
   2 #
   3 # headers_install prepare the listed header files for use in
   4 # user space and copy the files to their destination.
   5 #
   6 # Usage: headers_install.pl readdir installdir arch [files...]
   7 # installdir: dir to install the files to
   8 # arch:       current architecture
   9 #             arch is used to force a reinstallation when the arch
  10 #             changes because kbuild then detect a command line change.
  11 # files:      list of files to check
  12 #
  13 # Step in preparation for users space:
  14 # 1) Drop all use of compiler.h definitions
  15 # 2) Drop include of compiler.h
  16 # 3) Drop all sections defined out by __KERNEL__ (using unifdef)
  17
  18 use strict;
  19
  20 my ($installdir, $arch, @files) = @ARGV;
  21
  22 my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
  23
  24 foreach my $filename (@files) {
  25         my $file = $filename;
  26         $file =~ s!^.*/!!;
  27
  28         my $tmpfile = "$installdir/$file.tmp";
  29
  30         open(my $in, '<', $filename)
  31             or die "$filename: $!\n";
  32         open(my $out, '>', $tmpfile)
  33             or die "$tmpfile: $!\n";
  34         while (my $line = <$in>) {
  35                 $line =~ s/([\s(])__user\s/$1/g;
  36                 $line =~ s/([\s(])__force\s/$1/g;
  37                 $line =~ s/([\s(])__iomem\s/$1/g;
  38                 $line =~ s/\s__attribute_const__\s/ /g;
  39                 $line =~ s/\s__attribute_const__$//g;
  40                 $line =~ s/\b__packed\b/__attribute__((packed))/g;
  41                 $line =~ s/^#include <linux\/compiler.h>//;
  42                 $line =~ s/(^|\s)(inline)\b/$1__$2__/g;
  43                 $line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
  44                 $line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
  45                 $line =~ s/#ifndef\s+_UAPI/#ifndef /;
  46                 $line =~ s/#define\s+_UAPI/#define /;
  47                 $line =~ s!#endif\s+/[*]\s*_UAPI!#endif /* !;
  48                 printf {$out} "%s", $line;
  49         }
  50         close $out;
  51         close $in;
  52
  53         system $unifdef . " $tmpfile > $installdir/$file";
  54         # unifdef will exit 0 on success, and will exit 1 when the
  55         # file was processed successfully but no changes were made,
  56         # so abort only when it's higher than that.
  57         my $e = $? >> 8;
  58         if ($e > 1) {
  59                 die "$tmpfile: $!\n";
  60         }
  61         unlink $tmpfile;
  62 }
  63 exit 0;