3 # headers_install prepare the listed header files for use in
4 # user space and copy the files to their destination.
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
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)
21 my ($readdir, $installdir, $arch, $printdir, @files) = @ARGV;
23 $printdir =~ s@^include/@@;
25 my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
27 foreach my $file (@files) {
28 my $tmpfile = "$installdir/$file.tmp";
30 open(my $in, '<', "$readdir/$file")
31 or die "$readdir/$file: $!\n";
32 open(my $out, '>', $tmpfile)
33 or die "$tmpfile: $!\n";
34 while (my $line = <$in>) {
35 # Any #include which uses "" and does not have a path needs
36 # rewriting so that the resultant user space headers are
37 # safe against the use of -I-.
38 $line =~ s/^(\s*#\s*include\s+)"([^\/]*?)"/$1<$printdir\/$2>/;
39 $line =~ s/([\s(])__user\s/$1/g;
40 $line =~ s/([\s(])__force\s/$1/g;
41 $line =~ s/([\s(])__iomem\s/$1/g;
42 $line =~ s/\s__attribute_const__\s/ /g;
43 $line =~ s/\s__attribute_const__$//g;
44 $line =~ s/\b__packed\b/__attribute__((packed))/g;
45 $line =~ s/^#include <linux\/compiler.h>//;
46 $line =~ s/(^|\s)(inline)\b/$1__$2__/g;
47 $line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
48 $line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
49 printf {$out} "%s", $line;
54 system $unifdef . " $tmpfile > $installdir/$file";
55 # unifdef will exit 0 on success, and will exit 1 when the
56 # file was processed successfully but no changes were made,
57 # so abort only when it's higher than that.