Root/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
18use strict;
19
20my ($installdir, $arch, @files) = @ARGV;
21
22my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
23
24foreach 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}
63exit 0;
64

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