Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 1 | #!/usr/bin/perl -w |
| 2 | |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 3 | use File::Basename; |
| 4 | |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 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 <arjan@linux.intel.com> |
| 15 | |
| 16 | |
| 17 | my $vmlinux_name = $ARGV[0]; |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 18 | if (!defined($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 | } |
| 24 | my $filename = $vmlinux_name; |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 25 | # |
| 26 | # Step 1: Parse the oops to find the EIP value |
| 27 | # |
| 28 | |
| 29 | my $target = "0"; |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 30 | my $function; |
| 31 | my $module = ""; |
| 32 | my $func_offset; |
| 33 | my $vmaoffset = 0; |
| 34 | |
Arjan van de Ven | c19ef7f | 2009-02-15 11:30:52 +0100 | [diff] [blame^] | 35 | my %regs; |
| 36 | |
| 37 | |
| 38 | sub parse_x86_regs |
| 39 | { |
| 40 | my ($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"} = $4; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | sub process_x86_regs |
| 55 | { |
| 56 | my ($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 |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 107 | while (<STDIN>) { |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 108 | my $line = $_; |
| 109 | if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) { |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 110 | $target = $1; |
| 111 | } |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 112 | if ($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 = $3; |
| 120 | } |
Arjan van de Ven | c19ef7f | 2009-02-15 11:30:52 +0100 | [diff] [blame^] | 121 | parse_x86_regs($line); |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 122 | } |
| 123 | |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 124 | my $decodestart = hex($target) - hex($func_offset); |
Arjan van de Ven | c19ef7f | 2009-02-15 11:30:52 +0100 | [diff] [blame^] | 125 | my $decodestop = hex($target) + 8192; |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 126 | if ($target eq "0") { |
| 127 | print "No oops found!\n"; |
| 128 | print "Usage: \n"; |
| 129 | print " dmesg | perl scripts/markup_oops.pl vmlinux\n"; |
| 130 | exit; |
| 131 | } |
| 132 | |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 133 | # if it's a module, we need to find the .ko file and calculate a load offset |
| 134 | if ($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 | |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 156 | my $counter = 0; |
| 157 | my $state = 0; |
| 158 | my $center = 0; |
| 159 | my @lines; |
Arjan van de Ven | c19ef7f | 2009-02-15 11:30:52 +0100 | [diff] [blame^] | 160 | my @reglines; |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 161 | |
| 162 | sub InRange { |
| 163 | my ($address, $target) = @_; |
| 164 | my $ad = "0x".$address; |
| 165 | my $ta = "0x".$target; |
| 166 | my $delta = hex($ad) - hex($ta); |
| 167 | |
| 168 | if (($delta > -4096) && ($delta < 4096)) { |
| 169 | return 1; |
| 170 | } |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | |
| 175 | |
| 176 | # first, parse the input into the lines array, but to keep size down, |
| 177 | # we only do this for 4Kb around the sweet spot |
| 178 | |
Arjan van de Ven | d32ad10 | 2009-01-11 15:03:23 +0000 | [diff] [blame] | 179 | open(FILE, "objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump"; |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 180 | |
| 181 | while (<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 = $counter + 1; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | close(FILE); |
| 207 | |
| 208 | if ($counter == 0) { |
| 209 | print "No matching code found \n"; |
| 210 | exit; |
| 211 | } |
| 212 | |
| 213 | if ($center == 0) { |
| 214 | print "No matching code found \n"; |
| 215 | exit; |
| 216 | } |
| 217 | |
| 218 | my $start; |
| 219 | my $finish; |
| 220 | my $codelines = 0; |
| 221 | my $binarylines = 0; |
| 222 | # now we go up and down in the array to find how much we want to print |
| 223 | |
| 224 | $start = $center; |
| 225 | |
| 226 | while ($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 | $binarylines = 0; |
| 246 | while ($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 | |
| 263 | my $i; |
| 264 | |
Arjan van de Ven | c19ef7f | 2009-02-15 11:30:52 +0100 | [diff] [blame^] | 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 = $center; |
| 272 | while ($i >= $start) { |
| 273 | $reglines[$i] = process_x86_regs($lines[$i], $center - $i); |
| 274 | $i = $i - 1; |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 275 | } |
| 276 | |
Arjan van de Ven | c19ef7f | 2009-02-15 11:30:52 +0100 | [diff] [blame^] | 277 | $i = $start; |
| 278 | while ($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 | } |
Arjan van de Ven | 5aea50b | 2009-01-06 14:40:57 -0800 | [diff] [blame] | 297 | |