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