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1 | #!/usr/bin/perl -w |
2 | # |
3 | # headers_check.pl execute a number of trivial consistency checks |
4 | # |
5 | # Usage: headers_check.pl dir arch [files...] |
6 | # dir: dir to look for included files |
7 | # arch: architecture |
8 | # files: list of files to check |
9 | # |
10 | # The script reads the supplied files line by line and: |
11 | # |
12 | # 1) for each include statement it checks if the |
13 | # included file actually exists. |
14 | # Only include files located in asm* and linux* are checked. |
15 | # The rest are assumed to be system include files. |
16 | # |
17 | # 2) It is checked that prototypes does not use "extern" |
18 | # |
19 | # 3) Check for leaked CONFIG_ symbols |
20 | |
21 | use strict; |
22 | use File::Basename; |
23 | |
24 | my ($dir, $arch, @files) = @ARGV; |
25 | |
26 | my $ret = 0; |
27 | my $line; |
28 | my $lineno = 0; |
29 | my $filename; |
30 | |
31 | foreach my $file (@files) { |
32 | $filename = $file; |
33 | |
34 | open(my $fh, '<', $filename) |
35 | or die "$filename: $!\n"; |
36 | $lineno = 0; |
37 | while ($line = <$fh>) { |
38 | $lineno++; |
39 | &check_include(); |
40 | &check_asm_types(); |
41 | &check_sizetypes(); |
42 | &check_declarations(); |
43 | # Dropped for now. Too much noise &check_config(); |
44 | } |
45 | close $fh; |
46 | } |
47 | exit $ret; |
48 | |
49 | sub check_include |
50 | { |
51 | if ($line =~ m/^\s*#\s*include\s+<((asm|linux).*)>/) { |
52 | my $inc = $1; |
53 | my $found; |
54 | $found = stat($dir . "/" . $inc); |
55 | if (!$found) { |
56 | $inc =~ s#asm/#asm-$arch/#; |
57 | $found = stat($dir . "/" . $inc); |
58 | } |
59 | if (!$found) { |
60 | printf STDERR "$filename:$lineno: included file '$inc' is not exported\n"; |
61 | $ret = 1; |
62 | } |
63 | } |
64 | } |
65 | |
66 | sub check_declarations |
67 | { |
68 | if ($line =~m/^(\s*extern|unsigned|char|short|int|long|void)\b/) { |
69 | printf STDERR "$filename:$lineno: " . |
70 | "userspace cannot reference function or " . |
71 | "variable defined in the kernel\n"; |
72 | } |
73 | } |
74 | |
75 | sub check_config |
76 | { |
77 | if ($line =~ m/[^a-zA-Z0-9_]+CONFIG_([a-zA-Z0-9_]+)[^a-zA-Z0-9_]/) { |
78 | printf STDERR "$filename:$lineno: leaks CONFIG_$1 to userspace where it is not valid\n"; |
79 | } |
80 | } |
81 | |
82 | my $linux_asm_types; |
83 | sub check_asm_types |
84 | { |
85 | if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) { |
86 | return; |
87 | } |
88 | if ($lineno == 1) { |
89 | $linux_asm_types = 0; |
90 | } elsif ($linux_asm_types >= 1) { |
91 | return; |
92 | } |
93 | if ($line =~ m/^\s*#\s*include\s+<asm\/types.h>/) { |
94 | $linux_asm_types = 1; |
95 | printf STDERR "$filename:$lineno: " . |
96 | "include of <linux/types.h> is preferred over <asm/types.h>\n" |
97 | # Warn until headers are all fixed |
98 | #$ret = 1; |
99 | } |
100 | } |
101 | |
102 | my $linux_types; |
103 | my %import_stack = (); |
104 | sub check_include_typesh |
105 | { |
106 | my $path = $_[0]; |
107 | my $import_path; |
108 | |
109 | my $fh; |
110 | my @file_paths = ($path, $dir . "/" . $path, dirname($filename) . "/" . $path); |
111 | for my $possible ( @file_paths ) { |
112 | if (not $import_stack{$possible} and open($fh, '<', $possible)) { |
113 | $import_path = $possible; |
114 | $import_stack{$import_path} = 1; |
115 | last; |
116 | } |
117 | } |
118 | if (eof $fh) { |
119 | return; |
120 | } |
121 | |
122 | my $line; |
123 | while ($line = <$fh>) { |
124 | if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) { |
125 | $linux_types = 1; |
126 | last; |
127 | } |
128 | if (my $included = ($line =~ /^\s*#\s*include\s+[<"](\S+)[>"]/)[0]) { |
129 | check_include_typesh($included); |
130 | } |
131 | } |
132 | close $fh; |
133 | delete $import_stack{$import_path}; |
134 | } |
135 | |
136 | sub check_sizetypes |
137 | { |
138 | if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) { |
139 | return; |
140 | } |
141 | if ($lineno == 1) { |
142 | $linux_types = 0; |
143 | } elsif ($linux_types >= 1) { |
144 | return; |
145 | } |
146 | if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) { |
147 | $linux_types = 1; |
148 | return; |
149 | } |
150 | if (my $included = ($line =~ /^\s*#\s*include\s+[<"](\S+)[>"]/)[0]) { |
151 | check_include_typesh($included); |
152 | } |
153 | if ($line =~ m/__[us](8|16|32|64)\b/) { |
154 | printf STDERR "$filename:$lineno: " . |
155 | "found __[us]{8,16,32,64} type " . |
156 | "without #include <linux/types.h>\n"; |
157 | $linux_types = 2; |
158 | # Warn until headers are all fixed |
159 | #$ret = 1; |
160 | } |
161 | } |
162 |
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