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