107 lines
2.9 KiB
Text
107 lines
2.9 KiB
Text
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#! /usr/bin/perl -w
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use strict;
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# Check command line.
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if (grep ($_ eq '-h' || $_ eq '--help', @ARGV)) {
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print <<'EOF';
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backtrace, for converting raw addresses into symbolic backtraces
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usage: backtrace [BINARY]... ADDRESS...
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where BINARY is the binary file or files from which to obtain symbols
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and ADDRESS is a raw address to convert to a symbol name.
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If no BINARY is unspecified, the default is the first of kernel.o or
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build/kernel.o that exists. If multiple binaries are specified, each
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symbol printed is from the first binary that contains a match.
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The ADDRESS list should be taken from the "Call stack:" printed by the
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kernel. Read "Backtraces" in the "Debugging Tools" chapter of the
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Pintos documentation for more information.
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EOF
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exit 0;
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}
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die "backtrace: at least one argument required (use --help for help)\n"
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if @ARGV == 0;
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# Drop garbage inserted by kernel.
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@ARGV = grep (!/^(call|stack:?|[-+])$/i, @ARGV);
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s/\.$// foreach @ARGV;
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# Find binaries.
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my (@binaries);
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while ($ARGV[0] !~ /^0x/) {
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my ($bin) = shift @ARGV;
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die "backtrace: $bin: not found (use --help for help)\n" if ! -e $bin;
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push (@binaries, $bin);
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}
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if (!@binaries) {
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my ($bin);
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if (-e 'kernel.o') {
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$bin = 'kernel.o';
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} elsif (-e 'build/kernel.o') {
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$bin = 'build/kernel.o';
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} else {
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die "backtrace: no binary specified and neither \"kernel.o\" nor \"build/kernel.o\" exists (use --help for help)\n";
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}
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push (@binaries, $bin);
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}
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# Find addr2line.
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my ($a2l) = search_path ("i386-elf-addr2line") || search_path ("addr2line");
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if (!$a2l) {
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die "backtrace: neither `i386-elf-addr2line' nor `addr2line' in PATH\n";
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}
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sub search_path {
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my ($target) = @_;
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for my $dir (split (':', $ENV{PATH})) {
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my ($file) = "$dir/$target";
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return $file if -e $file;
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}
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return undef;
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}
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# Figure out backtrace.
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my (@locs) = map ({ADDR => $_}, @ARGV);
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for my $bin (@binaries) {
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open (A2L, "$a2l -fe $bin " . join (' ', map ($_->{ADDR}, @locs)) . "|");
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for (my ($i) = 0; <A2L>; $i++) {
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my ($function, $line);
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chomp ($function = $_);
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chomp ($line = <A2L>);
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next if defined $locs[$i]{BINARY};
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if ($function ne '??' || $line ne '??:0') {
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$locs[$i]{FUNCTION} = $function;
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$locs[$i]{LINE} = $line;
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$locs[$i]{BINARY} = $bin;
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}
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}
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close (A2L);
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}
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# Print backtrace.
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my ($cur_binary);
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for my $loc (@locs) {
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if (defined ($loc->{BINARY})
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&& @binaries > 1
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&& (!defined ($cur_binary) || $loc->{BINARY} ne $cur_binary)) {
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$cur_binary = $loc->{BINARY};
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print "In $cur_binary:\n";
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}
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my ($addr) = $loc->{ADDR};
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$addr = sprintf ("0x%08x", hex ($addr)) if $addr =~ /^0x[0-9a-f]+$/i;
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print $addr, ": ";
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if (defined ($loc->{BINARY})) {
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my ($function) = $loc->{FUNCTION};
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my ($line) = $loc->{LINE};
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$line =~ s/^(\.\.\/)*//;
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$line = "..." . substr ($line, -25) if length ($line) > 28;
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print "$function ($line)";
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} else {
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print "(unknown)";
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}
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print "\n";
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}
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