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442ce844e1
Error: ./fs/quota_v2.o .opd refers to 0000000000000020 R_PPC64_ADDR64 .exit.text
Been carrying this for some time in Red Hat trees.
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.
Any idea why ppc .opd points to discarded sections when ia64 does not?
AFAICT no ia64 object has a useful .opd section, they are all empty or
(sometimes) a dummy entry which is 1 byte long. ia64 .opd data is
built at link time, not compile time.
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
113 lines
3.2 KiB
Perl
113 lines
3.2 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", $ignore);
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# printf("Scanning objects\n");
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# Keith Ownes <kaos@sgi.com> commented:
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# For our future {in}sanity, add a comment that this is the ppc .opd
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# section, not the ia64 .opd section.
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# ia64 .opd should not point to discarded sections.
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$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 !~ /\.opd$/ &&
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$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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