1#!/usr/bin/perl 2 3use File::Basename; 4use Math::BigInt; 5 6# Copyright 2008, Intel Corporation 7# 8# This file is part of the Linux kernel 9# 10# This program file is free software; you can redistribute it and/or modify it 11# under the terms of the GNU General Public License as published by the 12# Free Software Foundation; version 2 of the License. 13# 14# Authors: 15# Arjan van de Ven <arjan@linux.intel.com> 16 17 18my $vmlinux_name = $ARGV[0]; 19if (!defined($vmlinux_name)) { 20 my $kerver = `uname -r`; 21 chomp($kerver); 22 $vmlinux_name = "/lib/modules/$kerver/build/vmlinux"; 23 print "No vmlinux specified, assuming $vmlinux_name\n"; 24} 25my $filename = $vmlinux_name; 26# 27# Step 1: Parse the oops to find the EIP value 28# 29 30my $target = "0"; 31my $function; 32my $module = ""; 33my $func_offset = 0; 34my $vmaoffset = 0; 35 36my %regs; 37 38 39sub parse_x86_regs 40{ 41 my ($line) = @_; 42 if ($line =~ /EAX: ([0-9a-f]+) EBX: ([0-9a-f]+) ECX: ([0-9a-f]+) EDX: ([0-9a-f]+)/) { 43 $regs{"%eax"} = $1; 44 $regs{"%ebx"} = $2; 45 $regs{"%ecx"} = $3; 46 $regs{"%edx"} = $4; 47 } 48 if ($line =~ /ESI: ([0-9a-f]+) EDI: ([0-9a-f]+) EBP: ([0-9a-f]+) ESP: ([0-9a-f]+)/) { 49 $regs{"%esi"} = $1; 50 $regs{"%edi"} = $2; 51 $regs{"%esp"} = $4; 52 } 53 if ($line =~ /RAX: ([0-9a-f]+) RBX: ([0-9a-f]+) RCX: ([0-9a-f]+)/) { 54 $regs{"%eax"} = $1; 55 $regs{"%ebx"} = $2; 56 $regs{"%ecx"} = $3; 57 } 58 if ($line =~ /RDX: ([0-9a-f]+) RSI: ([0-9a-f]+) RDI: ([0-9a-f]+)/) { 59 $regs{"%edx"} = $1; 60 $regs{"%esi"} = $2; 61 $regs{"%edi"} = $3; 62 } 63 if ($line =~ /RBP: ([0-9a-f]+) R08: ([0-9a-f]+) R09: ([0-9a-f]+)/) { 64 $regs{"%r08"} = $2; 65 $regs{"%r09"} = $3; 66 } 67 if ($line =~ /R10: ([0-9a-f]+) R11: ([0-9a-f]+) R12: ([0-9a-f]+)/) { 68 $regs{"%r10"} = $1; 69 $regs{"%r11"} = $2; 70 $regs{"%r12"} = $3; 71 } 72 if ($line =~ /R13: ([0-9a-f]+) R14: ([0-9a-f]+) R15: ([0-9a-f]+)/) { 73 $regs{"%r13"} = $1; 74 $regs{"%r14"} = $2; 75 $regs{"%r15"} = $3; 76 } 77} 78 79sub reg_name 80{ 81 my ($reg) = @_; 82 $reg =~ s/r(.)x/e\1x/; 83 $reg =~ s/r(.)i/e\1i/; 84 $reg =~ s/r(.)p/e\1p/; 85 return $reg; 86} 87 88sub process_x86_regs 89{ 90 my ($line, $cntr) = @_; 91 my $str = ""; 92 if (length($line) < 40) { 93 return ""; # not an asm istruction 94 } 95 96 # find the arguments to the instruction 97 if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+]+)$/) { 98 $lastword = $1; 99 } else { 100 return ""; 101 } 102 103 # we need to find the registers that get clobbered, 104 # since their value is no longer relevant for previous 105 # instructions in the stream. 106 107 $clobber = $lastword; 108 # first, remove all memory operands, they're read only 109 $clobber =~ s/\([a-z0-9\%\,]+\)//g; 110 # then, remove everything before the comma, thats the read part 111 $clobber =~ s/.*\,//g; 112 113 # if this is the instruction that faulted, we haven't actually done 114 # the write yet... nothing is clobbered. 115 if ($cntr == 0) { 116 $clobber = ""; 117 } 118 119 foreach $reg (keys(%regs)) { 120 my $clobberprime = reg_name($clobber); 121 my $lastwordprime = reg_name($lastword); 122 my $val = $regs{$reg}; 123 if ($val =~ /^[0]+$/) { 124 $val = "0"; 125 } else { 126 $val =~ s/^0*//; 127 } 128 129 # first check if we're clobbering this register; if we do 130 # we print it with a =>, and then delete its value 131 if ($clobber =~ /$reg/ || $clobberprime =~ /$reg/) { 132 if (length($val) > 0) { 133 $str = $str . " $reg => $val "; 134 } 135 $regs{$reg} = ""; 136 $val = ""; 137 } 138 # now check if we're reading this register 139 if ($lastword =~ /$reg/ || $lastwordprime =~ /$reg/) { 140 if (length($val) > 0) { 141 $str = $str . " $reg = $val "; 142 } 143 } 144 } 145 return $str; 146} 147 148# parse the oops 149while (<STDIN>) { 150 my $line = $_; 151 if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) { 152 $target = $1; 153 } 154 if ($line =~ /RIP: 0010:\[\<([a-z0-9]+)\>\]/) { 155 $target = $1; 156 } 157 if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]/) { 158 $function = $1; 159 $func_offset = $2; 160 } 161 if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]/) { 162 $function = $1; 163 $func_offset = $2; 164 } 165 166 # check if it's a module 167 if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) { 168 $module = $3; 169 } 170 if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) { 171 $module = $3; 172 } 173 parse_x86_regs($line); 174} 175 176my $decodestart = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$func_offset"); 177my $decodestop = Math::BigInt->from_hex("0x$target") + 8192; 178if ($target eq "0") { 179 print "No oops found!\n"; 180 print "Usage: \n"; 181 print " dmesg | perl scripts/markup_oops.pl vmlinux\n"; 182 exit; 183} 184 185# if it's a module, we need to find the .ko file and calculate a load offset 186if ($module ne "") { 187 my $modulefile = `modinfo $module | grep '^filename:' | awk '{ print \$2 }'`; 188 chomp($modulefile); 189 $filename = $modulefile; 190 if ($filename eq "") { 191 print "Module .ko file for $module not found. Aborting\n"; 192 exit; 193 } 194 # ok so we found the module, now we need to calculate the vma offset 195 open(FILE, "objdump -dS $filename |") || die "Cannot start objdump"; 196 while (<FILE>) { 197 if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) { 198 my $fu = $1; 199 $vmaoffset = hex($target) - hex($fu) - hex($func_offset); 200 } 201 } 202 close(FILE); 203} 204 205my $counter = 0; 206my $state = 0; 207my $center = 0; 208my @lines; 209my @reglines; 210 211sub InRange { 212 my ($address, $target) = @_; 213 my $ad = "0x".$address; 214 my $ta = "0x".$target; 215 my $delta = hex($ad) - hex($ta); 216 217 if (($delta > -4096) && ($delta < 4096)) { 218 return 1; 219 } 220 return 0; 221} 222 223 224 225# first, parse the input into the lines array, but to keep size down, 226# we only do this for 4Kb around the sweet spot 227 228open(FILE, "objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump"; 229 230while (<FILE>) { 231 my $line = $_; 232 chomp($line); 233 if ($state == 0) { 234 if ($line =~ /^([a-f0-9]+)\:/) { 235 if (InRange($1, $target)) { 236 $state = 1; 237 } 238 } 239 } else { 240 if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) { 241 my $val = $1; 242 if (!InRange($val, $target)) { 243 last; 244 } 245 if ($val eq $target) { 246 $center = $counter; 247 } 248 } 249 $lines[$counter] = $line; 250 251 $counter = $counter + 1; 252 } 253} 254 255close(FILE); 256 257if ($counter == 0) { 258 print "No matching code found \n"; 259 exit; 260} 261 262if ($center == 0) { 263 print "No matching code found \n"; 264 exit; 265} 266 267my $start; 268my $finish; 269my $codelines = 0; 270my $binarylines = 0; 271# now we go up and down in the array to find how much we want to print 272 273$start = $center; 274 275while ($start > 1) { 276 $start = $start - 1; 277 my $line = $lines[$start]; 278 if ($line =~ /^([a-f0-9]+)\:/) { 279 $binarylines = $binarylines + 1; 280 } else { 281 $codelines = $codelines + 1; 282 } 283 if ($codelines > 10) { 284 last; 285 } 286 if ($binarylines > 20) { 287 last; 288 } 289} 290 291 292$finish = $center; 293$codelines = 0; 294$binarylines = 0; 295while ($finish < $counter) { 296 $finish = $finish + 1; 297 my $line = $lines[$finish]; 298 if ($line =~ /^([a-f0-9]+)\:/) { 299 $binarylines = $binarylines + 1; 300 } else { 301 $codelines = $codelines + 1; 302 } 303 if ($codelines > 10) { 304 last; 305 } 306 if ($binarylines > 20) { 307 last; 308 } 309} 310 311 312my $i; 313 314 315# start annotating the registers in the asm. 316# this goes from the oopsing point back, so that the annotator 317# can track (opportunistically) which registers got written and 318# whos value no longer is relevant. 319 320$i = $center; 321while ($i >= $start) { 322 $reglines[$i] = process_x86_regs($lines[$i], $center - $i); 323 $i = $i - 1; 324} 325 326$i = $start; 327while ($i < $finish) { 328 my $line; 329 if ($i == $center) { 330 $line = "*$lines[$i] "; 331 } else { 332 $line = " $lines[$i] "; 333 } 334 print $line; 335 if (defined($reglines[$i]) && length($reglines[$i]) > 0) { 336 my $c = 60 - length($line); 337 while ($c > 0) { print " "; $c = $c - 1; }; 338 print "| $reglines[$i]"; 339 } 340 if ($i == $center) { 341 print "<--- faulting instruction"; 342 } 343 print "\n"; 344 $i = $i +1; 345} 346 347