109 lines
3.3 KiB
Perl
109 lines
3.3 KiB
Perl
#!/usr/bin/perl -w
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#
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# reference_init.pl (C) Keith Owens 2002 <kaos@ocs.com.au>
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#
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# List references to vmlinux init sections from non-init sections.
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# Unfortunately I had to exclude references from read only data to .init
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# sections, almost all of these are false positives, they are created by
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# gcc. The downside of excluding rodata is that there really are some
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# user references from rodata to init code, e.g. drivers/video/vgacon.c
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#
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# const struct consw vga_con = {
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# con_startup: vgacon_startup,
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#
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# where vgacon_startup is __init. If you want to wade through the false
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# positives, take out the check for rodata.
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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 $ignore;
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$| = 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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foreach $object (sort(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 =~ /\.init$/ || $line =~ /\.init\./) &&
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($from !~ /\.init$/ &&
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$from !~ /\.init\./ &&
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$from !~ /\.stab$/ &&
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$from !~ /\.rodata$/ &&
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$from !~ /\.text\.lock$/ &&
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$from !~ /\.pci_fixup_header$/ &&
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$from !~ /\.pci_fixup_final$/ &&
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$from !~ /\.pdr$/ &&
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$from !~ /\__param$/ &&
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$from !~ /\.altinstructions/ &&
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$from !~ /\.eh_frame/ &&
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$from !~ /\.debug_/)) {
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printf("Error: %s %s refers to %s\n", $object, $from, $line);
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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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