1#!/usr/bin/perl -w 2 3use File::Basename; 4 5# Copyright 2008, Intel Corporation 6# 7# This file is part of the Linux kernel 8# 9# This program file is free software; you can redistribute it and/or modify it 10# under the terms of the GNU General Public License as published by the 11# Free Software Foundation; version 2 of the License. 12# 13# Authors: 14# Arjan van de Ven <[email protected]> 15 16 17my $vmlinux_name = $ARGV[0]; 18if (!defined($vmlinux_name)) { 19 my $kerver = `uname -r`; 20 chomp($kerver); 21 $vmlinux_name = "/lib/modules/$kerver/build/vmlinux"; 22 print "No vmlinux specified, assuming $vmlinux_name\n"; 23} 24my $filename = $vmlinux_name; 25# 26# Step 1: Parse the oops to find the EIP value 27# 28 29my $target = "0"; 30my $function; 31my $module = ""; 32my $func_offset; 33my $vmaoffset = 0; 34 35my %regs; 36 37 38sub parse_x86_regs 39{ 40 my ($line) = @_; 41 if ($line =~ /EAX: ([0-9a-f]+) EBX: ([0-9a-f]+) ECX: ([0-9a-f]+) EDX: ([0-9a-f]+)/) { 42 $regs{"%eax"} = $1; 43 $regs{"%ebx"} = $2; 44 $regs{"%ecx"} = $3; 45 $regs{"%edx"} = $4; 46 } 47 if ($line =~ /ESI: ([0-9a-f]+) EDI: ([0-9a-f]+) EBP: ([0-9a-f]+) ESP: ([0-9a-f]+)/) { 48 $regs{"%esi"} = $1; 49 $regs{"%edi"} = $2; 50 $regs{"%esp"} = $4; 51 } 52} 53 54sub process_x86_regs 55{ 56 my ($line, $cntr) = @_; 57 my $str = ""; 58 if (length($line) < 40) { 59 return ""; # not an asm istruction 60 } 61 62 # find the arguments to the instruction 63 if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+]+)$/) { 64 $lastword = $1; 65 } else { 66 return ""; 67 } 68 69 # we need to find the registers that get clobbered, 70 # since their value is no longer relevant for previous 71 # instructions in the stream. 72 73 $clobber = $lastword; 74 # first, remove all memory operands, they're read only 75 $clobber =~ s/\([a-z0-9\%\,]+\)//g; 76 # then, remove everything before the comma, thats the read part 77 $clobber =~ s/.*\,//g; 78 79 # if this is the instruction that faulted, we haven't actually done 80 # the write yet... nothing is clobbered. 81 if ($cntr == 0) { 82 $clobber = ""; 83 } 84 85 foreach $reg (keys(%regs)) { 86 my $val = $regs{$reg}; 87 # first check if we're clobbering this register; if we do 88 # we print it with a =>, and then delete its value 89 if ($clobber =~ /$reg/) { 90 if (length($val) > 0) { 91 $str = $str . " $reg => $val "; 92 } 93 $regs{$reg} = ""; 94 $val = ""; 95 } 96 # now check if we're reading this register 97 if ($lastword =~ /$reg/) { 98 if (length($val) > 0) { 99 $str = $str . " $reg = $val "; 100 } 101 } 102 } 103 return $str; 104} 105 106# parse the oops 107while (<STDIN>) { 108 my $line = $_; 109 if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) { 110 $target = $1; 111 } 112 if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]/) { 113 $function = $1; 114 $func_offset = $2; 115 } 116 117 # check if it's a module 118 if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) { 119 $module = $3; 120 } 121 parse_x86_regs($line); 122} 123 124my $decodestart = hex($target) - hex($func_offset); 125my $decodestop = hex($target) + 8192; 126if ($target eq "0") { 127 print "No oops found!\n"; 128 print "Usage: \n"; 129 print " dmesg | perl scripts/markup_oops.pl vmlinux\n"; 130 exit; 131} 132 133# if it's a module, we need to find the .ko file and calculate a load offset 134if ($module ne "") { 135 my $dir = dirname($filename); 136 $dir = $dir . "/"; 137 my $mod = $module . ".ko"; 138 my $modulefile = `find $dir -name $mod | head -1`; 139 chomp($modulefile); 140 $filename = $modulefile; 141 if ($filename eq "") { 142 print "Module .ko file for $module not found. Aborting\n"; 143 exit; 144 } 145 # ok so we found the module, now we need to calculate the vma offset 146 open(FILE, "objdump -dS $filename |") || die "Cannot start objdump"; 147 while (<FILE>) { 148 if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) { 149 my $fu = $1; 150 $vmaoffset = hex($target) - hex($fu) - hex($func_offset); 151 } 152 } 153 close(FILE); 154} 155 156my $counter = 0; 157my $state = 0; 158my $center = 0; 159my @lines; 160my @reglines; 161 162sub InRange { 163 my ($address, $target) = @_; 164 my $ad = "0x".$address; 165 my $ta = "0x".$target; 166 my $delta = hex($ad) - hex($ta); 167 168 if (($delta > -4096) && ($delta < 4096)) { 169 return 1; 170 } 171 return 0; 172} 173 174 175 176# first, parse the input into the lines array, but to keep size down, 177# we only do this for 4Kb around the sweet spot 178 179open(FILE, "objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump"; 180 181while (<FILE>) { 182 my $line = $_; 183 chomp($line); 184 if ($state == 0) { 185 if ($line =~ /^([a-f0-9]+)\:/) { 186 if (InRange($1, $target)) { 187 $state = 1; 188 } 189 } 190 } else { 191 if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) { 192 my $val = $1; 193 if (!InRange($val, $target)) { 194 last; 195 } 196 if ($val eq $target) { 197 $center = $counter; 198 } 199 } 200 $lines[$counter] = $line; 201 202 $counter = $counter + 1; 203 } 204} 205 206close(FILE); 207 208if ($counter == 0) { 209 print "No matching code found \n"; 210 exit; 211} 212 213if ($center == 0) { 214 print "No matching code found \n"; 215 exit; 216} 217 218my $start; 219my $finish; 220my $codelines = 0; 221my $binarylines = 0; 222# now we go up and down in the array to find how much we want to print 223 224$start = $center; 225 226while ($start > 1) { 227 $start = $start - 1; 228 my $line = $lines[$start]; 229 if ($line =~ /^([a-f0-9]+)\:/) { 230 $binarylines = $binarylines + 1; 231 } else { 232 $codelines = $codelines + 1; 233 } 234 if ($codelines > 10) { 235 last; 236 } 237 if ($binarylines > 20) { 238 last; 239 } 240} 241 242 243$finish = $center; 244$codelines = 0; 245$binarylines = 0; 246while ($finish < $counter) { 247 $finish = $finish + 1; 248 my $line = $lines[$finish]; 249 if ($line =~ /^([a-f0-9]+)\:/) { 250 $binarylines = $binarylines + 1; 251 } else { 252 $codelines = $codelines + 1; 253 } 254 if ($codelines > 10) { 255 last; 256 } 257 if ($binarylines > 20) { 258 last; 259 } 260} 261 262 263my $i; 264 265 266# start annotating the registers in the asm. 267# this goes from the oopsing point back, so that the annotator 268# can track (opportunistically) which registers got written and 269# whos value no longer is relevant. 270 271$i = $center; 272while ($i >= $start) { 273 $reglines[$i] = process_x86_regs($lines[$i], $center - $i); 274 $i = $i - 1; 275} 276 277$i = $start; 278while ($i < $finish) { 279 my $line; 280 if ($i == $center) { 281 $line = "*$lines[$i] "; 282 } else { 283 $line = " $lines[$i] "; 284 } 285 print $line; 286 if (defined($reglines[$i]) && length($reglines[$i]) > 0) { 287 my $c = 60 - length($line); 288 while ($c > 0) { print " "; $c = $c - 1; }; 289 print "| $reglines[$i]"; 290 } 291 if ($i == $center) { 292 print "<--- faulting instruction"; 293 } 294 print "\n"; 295 $i = $i +1; 296} 297 298