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-rw-r--r--scripts/reference_discarded.pl112
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diff --git a/scripts/reference_discarded.pl b/scripts/reference_discarded.pl
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1#!/usr/bin/perl -w
2#
3# reference_discarded.pl (C) Keith Owens 2001 <kaos@ocs.com.au>
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", $ignore);
72
73# printf("Scanning objects\n");
74
75# Keith Ownes <kaos@sgi.com> commented:
76# For our future {in}sanity, add a comment that this is the ppc .opd
77# section, not the ia64 .opd section.
78# ia64 .opd should not point to discarded sections.
79$errorcount = 0;
80foreach $object (keys(%object)) {
81 my $from;
82 open(OBJDUMP, "objdump -r $object|") || die "cannot objdump -r $object";
83 while (defined($line = <OBJDUMP>)) {
84 chomp($line);
85 if ($line =~ /RELOCATION RECORDS FOR /) {
86 ($from = $line) =~ s/.*\[([^]]*).*/$1/;
87 }
88 if (($line =~ /\.text\.exit$/ ||
89 $line =~ /\.exit\.text$/ ||
90 $line =~ /\.data\.exit$/ ||
91 $line =~ /\.exit\.data$/ ||
92 $line =~ /\.exitcall\.exit$/) &&
93 ($from !~ /\.text\.exit$/ &&
94 $from !~ /\.exit\.text$/ &&
95 $from !~ /\.data\.exit$/ &&
96 $from !~ /\.opd$/ &&
97 $from !~ /\.exit\.data$/ &&
98 $from !~ /\.altinstructions$/ &&
99 $from !~ /\.pdr$/ &&
100 $from !~ /\.debug_.*$/ &&
101 $from !~ /\.exitcall\.exit$/ &&
102 $from !~ /\.eh_frame$/ &&
103 $from !~ /\.stab$/)) {
104 printf("Error: %s %s refers to %s\n", $object, $from, $line);
105 $errorcount = $errorcount + 1;
106 }
107 }
108 close(OBJDUMP);
109}
110# printf("Done\n");
111
112exit(0);