--- /dev/null
+#!/usr/bin/perl
+
+use File::Basename;
+use Math::BigInt;
+use Getopt::Long;
+
+# Copyright 2008, Intel Corporation
+#
+# This file is part of the Linux kernel
+#
+# This program file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; version 2 of the License.
+#
+# Authors:
+# Arjan van de Ven <arjan@linux.intel.com>
+
+
+my $cross_compile = "";
+my $vmlinux_name = "";
+my $modulefile = "";
+
+# Get options
+Getopt::Long::GetOptions(
+ 'cross-compile|c=s' => \$cross_compile,
+ 'module|m=s' => \$modulefile,
+ 'help|h' => \&usage,
+) || usage ();
+my $vmlinux_name = $ARGV[0];
+if (!defined($vmlinux_name)) {
+ my $kerver = `uname -r`;
+ chomp($kerver);
+ $vmlinux_name = "/lib/modules/$kerver/build/vmlinux";
+ print "No vmlinux specified, assuming $vmlinux_name\n";
+}
+my $filename = $vmlinux_name;
+
+# Parse the oops to find the EIP value
+
+my $target = "0";
+my $function;
+my $module = "";
+my $func_offset = 0;
+my $vmaoffset = 0;
+
+my %regs;
+
+
+sub parse_x86_regs
+{
+ my ($line) = @_;
+ if ($line =~ /EAX: ([0-9a-f]+) EBX: ([0-9a-f]+) ECX: ([0-9a-f]+) EDX: ([0-9a-f]+)/) {
+ $regs{"%eax"} = $1;
+ $regs{"%ebx"} = $2;
+ $regs{"%ecx"} = $3;
+ $regs{"%edx"} = $4;
+ }
+ if ($line =~ /ESI: ([0-9a-f]+) EDI: ([0-9a-f]+) EBP: ([0-9a-f]+) ESP: ([0-9a-f]+)/) {
+ $regs{"%esi"} = $1;
+ $regs{"%edi"} = $2;
+ $regs{"%esp"} = $4;
+ }
+ if ($line =~ /RAX: ([0-9a-f]+) RBX: ([0-9a-f]+) RCX: ([0-9a-f]+)/) {
+ $regs{"%eax"} = $1;
+ $regs{"%ebx"} = $2;
+ $regs{"%ecx"} = $3;
+ }
+ if ($line =~ /RDX: ([0-9a-f]+) RSI: ([0-9a-f]+) RDI: ([0-9a-f]+)/) {
+ $regs{"%edx"} = $1;
+ $regs{"%esi"} = $2;
+ $regs{"%edi"} = $3;
+ }
+ if ($line =~ /RBP: ([0-9a-f]+) R08: ([0-9a-f]+) R09: ([0-9a-f]+)/) {
+ $regs{"%r08"} = $2;
+ $regs{"%r09"} = $3;
+ }
+ if ($line =~ /R10: ([0-9a-f]+) R11: ([0-9a-f]+) R12: ([0-9a-f]+)/) {
+ $regs{"%r10"} = $1;
+ $regs{"%r11"} = $2;
+ $regs{"%r12"} = $3;
+ }
+ if ($line =~ /R13: ([0-9a-f]+) R14: ([0-9a-f]+) R15: ([0-9a-f]+)/) {
+ $regs{"%r13"} = $1;
+ $regs{"%r14"} = $2;
+ $regs{"%r15"} = $3;
+ }
+}
+
+sub reg_name
+{
+ my ($reg) = @_;
+ $reg =~ s/r(.)x/e\1x/;
+ $reg =~ s/r(.)i/e\1i/;
+ $reg =~ s/r(.)p/e\1p/;
+ return $reg;
+}
+
+sub process_x86_regs
+{
+ my ($line, $cntr) = @_;
+ my $str = "";
+ if (length($line) < 40) {
+ return ""; # not an asm istruction
+ }
+
+ # find the arguments to the instruction
+ if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+]+)$/) {
+ $lastword = $1;
+ } else {
+ return "";
+ }
+
+ # we need to find the registers that get clobbered,
+ # since their value is no longer relevant for previous
+ # instructions in the stream.
+
+ $clobber = $lastword;
+ # first, remove all memory operands, they're read only
+ $clobber =~ s/\([a-z0-9\%\,]+\)//g;
+ # then, remove everything before the comma, thats the read part
+ $clobber =~ s/.*\,//g;
+
+ # if this is the instruction that faulted, we haven't actually done
+ # the write yet... nothing is clobbered.
+ if ($cntr == 0) {
+ $clobber = "";
+ }
+
+ foreach $reg (keys(%regs)) {
+ my $clobberprime = reg_name($clobber);
+ my $lastwordprime = reg_name($lastword);
+ my $val = $regs{$reg};
+ if ($val =~ /^[0]+$/) {
+ $val = "0";
+ } else {
+ $val =~ s/^0*//;
+ }
+
+ # first check if we're clobbering this register; if we do
+ # we print it with a =>, and then delete its value
+ if ($clobber =~ /$reg/ || $clobberprime =~ /$reg/) {
+ if (length($val) > 0) {
+ $str = $str . " $reg => $val ";
+ }
+ $regs{$reg} = "";
+ $val = "";
+ }
+ # now check if we're reading this register
+ if ($lastword =~ /$reg/ || $lastwordprime =~ /$reg/) {
+ if (length($val) > 0) {
+ $str = $str . " $reg = $val ";
+ }
+ }
+ }
+ return $str;
+}
+
+# parse the oops
+while (<STDIN>) {
+ my $line = $_;
+ if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
+ $target = $1;
+ }
+ if ($line =~ /RIP: 0010:\[\<([a-z0-9]+)\>\]/) {
+ $target = $1;
+ }
+ if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+0x([0-9a-f]+)\/0x[a-f0-9]/) {
+ $function = $1;
+ $func_offset = $2;
+ }
+ if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+0x([0-9a-f]+)\/0x[a-f0-9]/) {
+ $function = $1;
+ $func_offset = $2;
+ }
+
+ # check if it's a module
+ if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) {
+ $module = $3;
+ }
+ if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) {
+ $module = $3;
+ }
+ parse_x86_regs($line);
+}
+
+my $decodestart = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$func_offset");
+my $decodestop = Math::BigInt->from_hex("0x$target") + 8192;
+if ($target eq "0") {
+ print "No oops found!\n";
+ usage();
+}
+
+# if it's a module, we need to find the .ko file and calculate a load offset
+if ($module ne "") {
+ if ($modulefile eq "") {
+ $modulefile = `modinfo -F filename $module`;
+ chomp($modulefile);
+ }
+ $filename = $modulefile;
+ if ($filename eq "") {
+ print "Module .ko file for $module not found. Aborting\n";
+ exit;
+ }
+ # ok so we found the module, now we need to calculate the vma offset
+ open(FILE, $cross_compile."objdump -dS $filename |") || die "Cannot start objdump";
+ while (<FILE>) {
+ if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) {
+ my $fu = $1;
+ $vmaoffset = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$fu") - Math::BigInt->from_hex("0x$func_offset");
+ }
+ }
+ close(FILE);
+}
+
+my $counter = 0;
+my $state = 0;
+my $center = -1;
+my @lines;
+my @reglines;
+
+sub InRange {
+ my ($address, $target) = @_;
+ my $ad = "0x".$address;
+ my $ta = "0x".$target;
+ my $delta = Math::BigInt->from_hex($ad) - Math::BigInt->from_hex($ta);
+
+ if (($delta > -4096) && ($delta < 4096)) {
+ return 1;
+ }
+ return 0;
+}
+
+
+
+# first, parse the input into the lines array, but to keep size down,
+# we only do this for 4Kb around the sweet spot
+
+open(FILE, $cross_compile."objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump";
+
+while (<FILE>) {
+ my $line = $_;
+ chomp($line);
+ if ($state == 0) {
+ if ($line =~ /^([a-f0-9]+)\:/) {
+ if (InRange($1, $target)) {
+ $state = 1;
+ }
+ }
+ }
+ if ($state == 1) {
+ if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) {
+ my $val = $1;
+ if (!InRange($val, $target)) {
+ last;
+ }
+ if ($val eq $target) {
+ $center = $counter;
+ }
+ }
+ $lines[$counter] = $line;
+
+ $counter = $counter + 1;
+ }
+}
+
+close(FILE);
+
+if ($counter == 0) {
+ print "No matching code found \n";
+ exit;
+}
+
+if ($center == -1) {
+ print "No matching code found \n";
+ exit;
+}
+
+my $start;
+my $finish;
+my $codelines = 0;
+my $binarylines = 0;
+# now we go up and down in the array to find how much we want to print
+
+$start = $center;
+
+while ($start > 1) {
+ $start = $start - 1;
+ my $line = $lines[$start];
+ if ($line =~ /^([a-f0-9]+)\:/) {
+ $binarylines = $binarylines + 1;
+ } else {
+ $codelines = $codelines + 1;
+ }
+ if ($codelines > 10) {
+ last;
+ }
+ if ($binarylines > 20) {
+ last;
+ }
+}
+
+
+$finish = $center;
+$codelines = 0;
+$binarylines = 0;
+while ($finish < $counter) {
+ $finish = $finish + 1;
+ my $line = $lines[$finish];
+ if ($line =~ /^([a-f0-9]+)\:/) {
+ $binarylines = $binarylines + 1;
+ } else {
+ $codelines = $codelines + 1;
+ }
+ if ($codelines > 10) {
+ last;
+ }
+ if ($binarylines > 20) {
+ last;
+ }
+}
+
+
+my $i;
+
+
+# start annotating the registers in the asm.
+# this goes from the oopsing point back, so that the annotator
+# can track (opportunistically) which registers got written and
+# whos value no longer is relevant.
+
+$i = $center;
+while ($i >= $start) {
+ $reglines[$i] = process_x86_regs($lines[$i], $center - $i);
+ $i = $i - 1;
+}
+
+$i = $start;
+while ($i < $finish) {
+ my $line;
+ if ($i == $center) {
+ $line = "*$lines[$i] ";
+ } else {
+ $line = " $lines[$i] ";
+ }
+ print $line;
+ if (defined($reglines[$i]) && length($reglines[$i]) > 0) {
+ my $c = 60 - length($line);
+ while ($c > 0) { print " "; $c = $c - 1; };
+ print "| $reglines[$i]";
+ }
+ if ($i == $center) {
+ print "<--- faulting instruction";
+ }
+ print "\n";
+ $i = $i +1;
+}
+
+sub usage {
+ print <<EOT;
+Usage:
+ dmesg | perl $0 [OPTION] [VMLINUX]
+
+OPTION:
+ -c, --cross-compile CROSS_COMPILE Specify the prefix used for toolchain.
+ -m, --module MODULE_DIRNAME Specify the module filename.
+ -h, --help Help.
+EOT
+ exit;
+}
Code Review / kvmfornfv.git / blobdiff