#!/usr/bin/perl -w # # reference_discarded.pl (C) Keith Owens 2001 <kaos@ocs.com.au> # # Released under GPL V2. # # List dangling references to vmlinux discarded sections. use strict; die($0 . " takes no arguments\n") if($#ARGV >= 0); my %object; my $object; my $line; my $ignore; my $errorcount; $| = 1; # printf("Finding objects, "); open(OBJDUMP_LIST, "find . -name '*.o' | xargs objdump -h |") || die "getting objdump list failed"; while (defined($line = <OBJDUMP_LIST>)) { chomp($line); if ($line =~ /:\s+file format/) { ($object = $line) =~ s/:.*//; $object{$object}->{'module'} = 0; $object{$object}->{'size'} = 0; $object{$object}->{'off'} = 0; } if ($line =~ /^\s*\d+\s+\.modinfo\s+/) { $object{$object}->{'module'} = 1; } if ($line =~ /^\s*\d+\s+\.comment\s+/) { ($object{$object}->{'size'}, $object{$object}->{'off'}) = (split(' ', $line))[2,5]; } } close(OBJDUMP_LIST); # printf("%d objects, ", scalar keys(%object)); $ignore = 0; foreach $object (keys(%object)) { if ($object{$object}->{'module'}) { ++$ignore; delete($object{$object}); } } # printf("ignoring %d module(s)\n", $ignore); # Ignore conglomerate objects, they have been built from multiple objects and we # only care about the individual objects. If an object has more than one GCC: # string in the comment section then it is conglomerate. This does not filter # out conglomerates that consist of exactly one object, can't be helped. # printf("Finding conglomerates, "); $ignore = 0; foreach $object (keys(%object)) { if (exists($object{$object}->{'off'})) { my ($off, $size, $comment, $l); $off = hex($object{$object}->{'off'}); $size = hex($object{$object}->{'size'}); open(OBJECT, "<$object") || die "cannot read $object"; seek(OBJECT, $off, 0) || die "seek to $off in $object failed"; $l = read(OBJECT, $comment, $size); die "read $size bytes from $object .comment failed" if ($l != $size); close(OBJECT); if ($comment =~ /GCC\:.*GCC\:/m || $object =~ /built-in\.o/) { ++$ignore; delete($object{$object}); } } } # printf("ignoring %d conglomerate(s)\n", $ignore); # printf("Scanning objects\n"); # Keith Ownes <kaos@sgi.com> commented: # For our future {in}sanity, add a comment that this is the ppc .opd # section, not the ia64 .opd section. # ia64 .opd should not point to discarded sections. $errorcount = 0; foreach $object (keys(%object)) { my $from; open(OBJDUMP, "objdump -r $object|") || die "cannot objdump -r $object"; while (defined($line = <OBJDUMP>)) { chomp($line); if ($line =~ /RELOCATION RECORDS FOR /) { ($from = $line) =~ s/.*\[([^]]*).*/$1/; } if (($line =~ /\.text\.exit$/ || $line =~ /\.exit\.text$/ || $line =~ /\.data\.exit$/ || $line =~ /\.exit\.data$/ || $line =~ /\.exitcall\.exit$/) && ($from !~ /\.text\.exit$/ && $from !~ /\.exit\.text$/ && $from !~ /\.data\.exit$/ && $from !~ /\.opd$/ && $from !~ /\.exit\.data$/ && $from !~ /\.altinstructions$/ && $from !~ /\.pdr$/ && $from !~ /\.debug_.*$/ && $from !~ /\.exitcall\.exit$/ && $from !~ /\.eh_frame$/ && $from !~ /\.stab$/)) { printf("Error: %s %s refers to %s\n", $object, $from, $line); $errorcount = $errorcount + 1; } } close(OBJDUMP); } # printf("Done\n"); exit(0);