107 lines
3.0 KiB
Perl
107 lines
3.0 KiB
Perl
#!/usr/bin/perl -w
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#
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# reference_discarded.pl (C) Keith Owens 2001 <kaos@ocs.com.au>
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#
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# Released under GPL V2.
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#
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# List dangling references to vmlinux discarded sections.
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use strict;
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die($0 . " takes no arguments\n") if($#ARGV >= 0);
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my %object;
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my $object;
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my $line;
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my $ignore;
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my $errorcount;
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$| = 1;
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# printf("Finding objects, ");
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open(OBJDUMP_LIST, "find . -name '*.o' | xargs objdump -h |") || die "getting objdump list failed";
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while (defined($line = <OBJDUMP_LIST>)) {
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chomp($line);
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if ($line =~ /:\s+file format/) {
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($object = $line) =~ s/:.*//;
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$object{$object}->{'module'} = 0;
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$object{$object}->{'size'} = 0;
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$object{$object}->{'off'} = 0;
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}
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if ($line =~ /^\s*\d+\s+\.modinfo\s+/) {
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$object{$object}->{'module'} = 1;
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}
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if ($line =~ /^\s*\d+\s+\.comment\s+/) {
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($object{$object}->{'size'}, $object{$object}->{'off'}) = (split(' ', $line))[2,5];
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}
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}
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close(OBJDUMP_LIST);
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# printf("%d objects, ", scalar keys(%object));
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$ignore = 0;
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foreach $object (keys(%object)) {
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if ($object{$object}->{'module'}) {
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++$ignore;
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delete($object{$object});
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}
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}
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# printf("ignoring %d module(s)\n", $ignore);
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# Ignore conglomerate objects, they have been built from multiple objects and we
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# only care about the individual objects. If an object has more than one GCC:
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# string in the comment section then it is conglomerate. This does not filter
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# out conglomerates that consist of exactly one object, can't be helped.
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# printf("Finding conglomerates, ");
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$ignore = 0;
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foreach $object (keys(%object)) {
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if (exists($object{$object}->{'off'})) {
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my ($off, $size, $comment, $l);
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$off = hex($object{$object}->{'off'});
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$size = hex($object{$object}->{'size'});
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open(OBJECT, "<$object") || die "cannot read $object";
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seek(OBJECT, $off, 0) || die "seek to $off in $object failed";
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$l = read(OBJECT, $comment, $size);
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die "read $size bytes from $object .comment failed" if ($l != $size);
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close(OBJECT);
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if ($comment =~ /GCC\:.*GCC\:/m || $object =~ /built-in\.o/) {
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++$ignore;
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delete($object{$object});
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}
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}
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}
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# printf("ignoring %d conglomerate(s)\n", $ignore);
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# printf("Scanning objects\n");
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$errorcount = 0;
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foreach $object (keys(%object)) {
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my $from;
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open(OBJDUMP, "objdump -r $object|") || die "cannot objdump -r $object";
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while (defined($line = <OBJDUMP>)) {
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chomp($line);
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if ($line =~ /RELOCATION RECORDS FOR /) {
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($from = $line) =~ s/.*\[([^]]*).*/$1/;
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}
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if (($line =~ /\.text\.exit$/ ||
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$line =~ /\.exit\.text$/ ||
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$line =~ /\.data\.exit$/ ||
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$line =~ /\.exit\.data$/ ||
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$line =~ /\.exitcall\.exit$/) &&
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($from !~ /\.text\.exit$/ &&
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$from !~ /\.exit\.text$/ &&
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$from !~ /\.data\.exit$/ &&
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$from !~ /\.exit\.data$/ &&
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$from !~ /\.altinstructions$/ &&
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$from !~ /\.pdr$/ &&
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$from !~ /\.debug_.*$/ &&
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$from !~ /\.exitcall\.exit$/ &&
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$from !~ /\.eh_frame$/ &&
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$from !~ /\.stab$/)) {
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printf("Error: %s %s refers to %s\n", $object, $from, $line);
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$errorcount = $errorcount + 1;
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}
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}
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close(OBJDUMP);
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}
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# printf("Done\n");
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exit(0);
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