projects/linux·blob v2.6.13-rc3 · refs

110 lines · 3.2 KiB

1#!/usr/bin/perl -w
2#
3# reference_discarded.pl (C) Keith Owens 2001 <[email protected]>
4#
5# Released under GPL V2.
6#
7# List dangling references to vmlinux discarded sections.
8
9use strict;
10die($0 . " takes no arguments\n") if($#ARGV >= 0);
11
12my %object;
13my $object;
14my $line;
15my $ignore;
16my $errorcount;
17
18$| = 1;
19
20# printf("Finding objects, ");
21open(OBJDUMP_LIST, "find . -name '*.o' | xargs objdump -h |") || die "getting objdump list failed";
22while (defined($line = <OBJDUMP_LIST>)) {
23 chomp($line);
24 if ($line =~ /:\s+file format/) {
25 ($object = $line) =~ s/:.*//;
26 $object{$object}->{'module'} = 0;
27 $object{$object}->{'size'} = 0;
28 $object{$object}->{'off'} = 0;
29 }
30 if ($line =~ /^\s*\d+\s+\.modinfo\s+/) {
31 $object{$object}->{'module'} = 1;
32 }
33 if ($line =~ /^\s*\d+\s+\.comment\s+/) {
34 ($object{$object}->{'size'}, $object{$object}->{'off'}) = (split(' ', $line))[2,5];
35 }
36}
37close(OBJDUMP_LIST);
38# printf("%d objects, ", scalar keys(%object));
39$ignore = 0;
40foreach $object (keys(%object)) {
41 if ($object{$object}->{'module'}) {
42 ++$ignore;
43 delete($object{$object});
44 }
45}
46# printf("ignoring %d module(s)\n", $ignore);
47
48# Ignore conglomerate objects, they have been built from multiple objects and we
49# only care about the individual objects. If an object has more than one GCC:
50# string in the comment section then it is conglomerate. This does not filter
51# out conglomerates that consist of exactly one object, can't be helped.
52
53# printf("Finding conglomerates, ");
54$ignore = 0;
55foreach $object (keys(%object)) {
56 if (exists($object{$object}->{'off'})) {
57 my ($off, $size, $comment, $l);
58 $off = hex($object{$object}->{'off'});
59 $size = hex($object{$object}->{'size'});
60 open(OBJECT, "<$object") || die "cannot read $object";
61 seek(OBJECT, $off, 0) || die "seek to $off in $object failed";
62 $l = read(OBJECT, $comment, $size);
63 die "read $size bytes from $object .comment failed" if ($l != $size);
64 close(OBJECT);
65 if ($comment =~ /GCC\:.*GCC\:/m || $object =~ /built-in\.o/) {
66 ++$ignore;
67 delete($object{$object});
68 }
69 }
70}
71# printf("ignoring %d conglomerate(s)\n", $ignore);
72
73# printf("Scanning objects\n");
74$errorcount = 0;
75foreach $object (keys(%object)) {
76 my $from;
77 open(OBJDUMP, "objdump -r $object|") || die "cannot objdump -r $object";
78 while (defined($line = <OBJDUMP>)) {
79 chomp($line);
80 if ($line =~ /RELOCATION RECORDS FOR /) {
81 ($from = $line) =~ s/.*\[([^]]*).*/$1/;
82 }
83 if (($line =~ /\.text\.exit$/ ||
84 $line =~ /\.exit\.text$/ ||
85 $line =~ /\.data\.exit$/ ||
86 $line =~ /\.exit\.data$/ ||
87 $line =~ /\.exitcall\.exit$/) &&
88 ($from !~ /\.text\.exit$/ &&
89 $from !~ /\.exit\.text$/ &&
90 $from !~ /\.data\.exit$/ &&
91 $from !~ /\.exit\.data$/ &&
92 $from !~ /\.altinstructions$/ &&
93 $from !~ /\.pdr$/ &&
94 $from !~ /\.debug_info$/ &&
95 $from !~ /\.debug_aranges$/ &&
96 $from !~ /\.debug_ranges$/ &&
97 $from !~ /\.debug_line$/ &&
98 $from !~ /\.debug_frame$/ &&
99 $from !~ /\.exitcall\.exit$/ &&
100 $from !~ /\.eh_frame$/ &&
101 $from !~ /\.stab$/)) {
102 printf("Error: %s %s refers to %s\n", $object, $from, $line);
103 $errorcount = $errorcount + 1;
104 }
105 }
106 close(OBJDUMP);
107}
108# printf("Done\n");
109
110exit(0);