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1 | #!/usr/bin/perl |
2 | |
3 | use File::Basename; |
4 | use 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 | |
18 | my $vmlinux_name = $ARGV[0]; |
19 | if (!defined($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 | } |
25 | my $filename = $vmlinux_name; |
26 | # |
27 | # Step 1: Parse the oops to find the EIP value |
28 | # |
29 | |
30 | my $target = "0"; |
31 | my $function; |
32 | my $module = ""; |
33 | my $func_offset = 0; |
34 | my $vmaoffset = 0; |
35 | |
36 | my %regs; |
37 | |
38 | |
39 | sub parse_x86_regs |
40 | { |
41 | my ($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"} = $3; |
76 | } |
77 | } |
78 | |
79 | sub reg_name |
80 | { |
81 | my ($reg) = @_; |
82 | $reg =~ s/r(.)x/e\1x/; |
83 | $reg =~ s/r(.)i/e\1i/; |
84 | $reg =~ s/r(.)p/e\1p/; |
85 | return $reg; |
86 | } |
87 | |
88 | sub process_x86_regs |
89 | { |
90 | my ($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 |
149 | while (<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 | |
176 | my $decodestart = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$func_offset"); |
177 | my $decodestop = Math::BigInt->from_hex("0x$target") + 8192; |
178 | if ($target eq "0") { |
179 | print "No oops found!\n"; |
180 | print "Usage: \n"; |
181 | print " dmesg | perl scripts/markup_oops.pl vmlinux\n"; |
182 | exit; |
183 | } |
184 | |
185 | # if it's a module, we need to find the .ko file and calculate a load offset |
186 | if ($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 | |
205 | my $counter = 0; |
206 | my $state = 0; |
207 | my $center = 0; |
208 | my @lines; |
209 | my @reglines; |
210 | |
211 | sub InRange { |
212 | my ($address, $target) = @_; |
213 | my $ad = "0x".$address; |
214 | my $ta = "0x".$target; |
215 | my $delta = hex($ad) - hex($ta); |
216 | |
217 | if (($delta > -4096) && ($delta < 4096)) { |
218 | return 1; |
219 | } |
220 | return 0; |
221 | } |
222 | |
223 | |
224 | |
225 | # first, parse the input into the lines array, but to keep size down, |
226 | # we only do this for 4Kb around the sweet spot |
227 | |
228 | open(FILE, "objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump"; |
229 | |
230 | while (<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 = $counter + 1; |
252 | } |
253 | } |
254 | |
255 | close(FILE); |
256 | |
257 | if ($counter == 0) { |
258 | print "No matching code found \n"; |
259 | exit; |
260 | } |
261 | |
262 | if ($center == 0) { |
263 | print "No matching code found \n"; |
264 | exit; |
265 | } |
266 | |
267 | my $start; |
268 | my $finish; |
269 | my $codelines = 0; |
270 | my $binarylines = 0; |
271 | # now we go up and down in the array to find how much we want to print |
272 | |
273 | $start = $center; |
274 | |
275 | while ($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 | $binarylines = 0; |
295 | while ($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 | |
312 | my $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 = $center; |
321 | while ($i >= $start) { |
322 | $reglines[$i] = process_x86_regs($lines[$i], $center - $i); |
323 | $i = $i - 1; |
324 | } |
325 | |
326 | $i = $start; |
327 | while ($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 |
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