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1 | #!/usr/bin/perl |
2 | |
3 | use File::Basename; |
4 | use Math::BigInt; |
5 | use Getopt::Long; |
6 | |
7 | # Copyright 2008, Intel Corporation |
8 | # |
9 | # This file is part of the Linux kernel |
10 | # |
11 | # This program file is free software; you can redistribute it and/or modify it |
12 | # under the terms of the GNU General Public License as published by the |
13 | # Free Software Foundation; version 2 of the License. |
14 | # |
15 | # Authors: |
16 | # Arjan van de Ven <arjan@linux.intel.com> |
17 | |
18 | |
19 | my $cross_compile = ""; |
20 | my $vmlinux_name = ""; |
21 | my $modulefile = ""; |
22 | |
23 | # Get options |
24 | Getopt::Long::GetOptions( |
25 | 'cross-compile|c=s' => \$cross_compile, |
26 | 'module|m=s' => \$modulefile, |
27 | 'help|h' => \&usage, |
28 | ) || usage (); |
29 | my $vmlinux_name = $ARGV[0]; |
30 | if (!defined($vmlinux_name)) { |
31 | my $kerver = `uname -r`; |
32 | chomp($kerver); |
33 | $vmlinux_name = "/lib/modules/$kerver/build/vmlinux"; |
34 | print "No vmlinux specified, assuming $vmlinux_name\n"; |
35 | } |
36 | my $filename = $vmlinux_name; |
37 | |
38 | # Parse the oops to find the EIP value |
39 | |
40 | my $target = "0"; |
41 | my $function; |
42 | my $module = ""; |
43 | my $func_offset = 0; |
44 | my $vmaoffset = 0; |
45 | |
46 | my %regs; |
47 | |
48 | |
49 | sub parse_x86_regs |
50 | { |
51 | my ($line) = @_; |
52 | if ($line =~ /EAX: ([0-9a-f]+) EBX: ([0-9a-f]+) ECX: ([0-9a-f]+) EDX: ([0-9a-f]+)/) { |
53 | $regs{"%eax"} = $1; |
54 | $regs{"%ebx"} = $2; |
55 | $regs{"%ecx"} = $3; |
56 | $regs{"%edx"} = $4; |
57 | } |
58 | if ($line =~ /ESI: ([0-9a-f]+) EDI: ([0-9a-f]+) EBP: ([0-9a-f]+) ESP: ([0-9a-f]+)/) { |
59 | $regs{"%esi"} = $1; |
60 | $regs{"%edi"} = $2; |
61 | $regs{"%esp"} = $4; |
62 | } |
63 | if ($line =~ /RAX: ([0-9a-f]+) RBX: ([0-9a-f]+) RCX: ([0-9a-f]+)/) { |
64 | $regs{"%eax"} = $1; |
65 | $regs{"%ebx"} = $2; |
66 | $regs{"%ecx"} = $3; |
67 | } |
68 | if ($line =~ /RDX: ([0-9a-f]+) RSI: ([0-9a-f]+) RDI: ([0-9a-f]+)/) { |
69 | $regs{"%edx"} = $1; |
70 | $regs{"%esi"} = $2; |
71 | $regs{"%edi"} = $3; |
72 | } |
73 | if ($line =~ /RBP: ([0-9a-f]+) R08: ([0-9a-f]+) R09: ([0-9a-f]+)/) { |
74 | $regs{"%r08"} = $2; |
75 | $regs{"%r09"} = $3; |
76 | } |
77 | if ($line =~ /R10: ([0-9a-f]+) R11: ([0-9a-f]+) R12: ([0-9a-f]+)/) { |
78 | $regs{"%r10"} = $1; |
79 | $regs{"%r11"} = $2; |
80 | $regs{"%r12"} = $3; |
81 | } |
82 | if ($line =~ /R13: ([0-9a-f]+) R14: ([0-9a-f]+) R15: ([0-9a-f]+)/) { |
83 | $regs{"%r13"} = $1; |
84 | $regs{"%r14"} = $2; |
85 | $regs{"%r15"} = $3; |
86 | } |
87 | } |
88 | |
89 | sub reg_name |
90 | { |
91 | my ($reg) = @_; |
92 | $reg =~ s/r(.)x/e\1x/; |
93 | $reg =~ s/r(.)i/e\1i/; |
94 | $reg =~ s/r(.)p/e\1p/; |
95 | return $reg; |
96 | } |
97 | |
98 | sub process_x86_regs |
99 | { |
100 | my ($line, $cntr) = @_; |
101 | my $str = ""; |
102 | if (length($line) < 40) { |
103 | return ""; # not an asm istruction |
104 | } |
105 | |
106 | # find the arguments to the instruction |
107 | if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+]+)$/) { |
108 | $lastword = $1; |
109 | } else { |
110 | return ""; |
111 | } |
112 | |
113 | # we need to find the registers that get clobbered, |
114 | # since their value is no longer relevant for previous |
115 | # instructions in the stream. |
116 | |
117 | $clobber = $lastword; |
118 | # first, remove all memory operands, they're read only |
119 | $clobber =~ s/\([a-z0-9\%\,]+\)//g; |
120 | # then, remove everything before the comma, thats the read part |
121 | $clobber =~ s/.*\,//g; |
122 | |
123 | # if this is the instruction that faulted, we haven't actually done |
124 | # the write yet... nothing is clobbered. |
125 | if ($cntr == 0) { |
126 | $clobber = ""; |
127 | } |
128 | |
129 | foreach $reg (keys(%regs)) { |
130 | my $clobberprime = reg_name($clobber); |
131 | my $lastwordprime = reg_name($lastword); |
132 | my $val = $regs{$reg}; |
133 | if ($val =~ /^[0]+$/) { |
134 | $val = "0"; |
135 | } else { |
136 | $val =~ s/^0*//; |
137 | } |
138 | |
139 | # first check if we're clobbering this register; if we do |
140 | # we print it with a =>, and then delete its value |
141 | if ($clobber =~ /$reg/ || $clobberprime =~ /$reg/) { |
142 | if (length($val) > 0) { |
143 | $str = $str . " $reg => $val "; |
144 | } |
145 | $regs{$reg} = ""; |
146 | $val = ""; |
147 | } |
148 | # now check if we're reading this register |
149 | if ($lastword =~ /$reg/ || $lastwordprime =~ /$reg/) { |
150 | if (length($val) > 0) { |
151 | $str = $str . " $reg = $val "; |
152 | } |
153 | } |
154 | } |
155 | return $str; |
156 | } |
157 | |
158 | # parse the oops |
159 | while (<STDIN>) { |
160 | my $line = $_; |
161 | if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) { |
162 | $target = $1; |
163 | } |
164 | if ($line =~ /RIP: 0010:\[\<([a-z0-9]+)\>\]/) { |
165 | $target = $1; |
166 | } |
167 | if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+0x([0-9a-f]+)\/0x[a-f0-9]/) { |
168 | $function = $1; |
169 | $func_offset = $2; |
170 | } |
171 | if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+0x([0-9a-f]+)\/0x[a-f0-9]/) { |
172 | $function = $1; |
173 | $func_offset = $2; |
174 | } |
175 | |
176 | # check if it's a module |
177 | if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) { |
178 | $module = $3; |
179 | } |
180 | if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) { |
181 | $module = $3; |
182 | } |
183 | parse_x86_regs($line); |
184 | } |
185 | |
186 | my $decodestart = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$func_offset"); |
187 | my $decodestop = Math::BigInt->from_hex("0x$target") + 8192; |
188 | if ($target eq "0") { |
189 | print "No oops found!\n"; |
190 | usage(); |
191 | } |
192 | |
193 | # if it's a module, we need to find the .ko file and calculate a load offset |
194 | if ($module ne "") { |
195 | if ($modulefile eq "") { |
196 | $modulefile = `modinfo -F filename $module`; |
197 | chomp($modulefile); |
198 | } |
199 | $filename = $modulefile; |
200 | if ($filename eq "") { |
201 | print "Module .ko file for $module not found. Aborting\n"; |
202 | exit; |
203 | } |
204 | # ok so we found the module, now we need to calculate the vma offset |
205 | open(FILE, $cross_compile."objdump -dS $filename |") || die "Cannot start objdump"; |
206 | while (<FILE>) { |
207 | if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) { |
208 | my $fu = $1; |
209 | $vmaoffset = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$fu") - Math::BigInt->from_hex("0x$func_offset"); |
210 | } |
211 | } |
212 | close(FILE); |
213 | } |
214 | |
215 | my $counter = 0; |
216 | my $state = 0; |
217 | my $center = -1; |
218 | my @lines; |
219 | my @reglines; |
220 | |
221 | sub InRange { |
222 | my ($address, $target) = @_; |
223 | my $ad = "0x".$address; |
224 | my $ta = "0x".$target; |
225 | my $delta = Math::BigInt->from_hex($ad) - Math::BigInt->from_hex($ta); |
226 | |
227 | if (($delta > -4096) && ($delta < 4096)) { |
228 | return 1; |
229 | } |
230 | return 0; |
231 | } |
232 | |
233 | |
234 | |
235 | # first, parse the input into the lines array, but to keep size down, |
236 | # we only do this for 4Kb around the sweet spot |
237 | |
238 | open(FILE, $cross_compile."objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump"; |
239 | |
240 | while (<FILE>) { |
241 | my $line = $_; |
242 | chomp($line); |
243 | if ($state == 0) { |
244 | if ($line =~ /^([a-f0-9]+)\:/) { |
245 | if (InRange($1, $target)) { |
246 | $state = 1; |
247 | } |
248 | } |
249 | } |
250 | if ($state == 1) { |
251 | if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) { |
252 | my $val = $1; |
253 | if (!InRange($val, $target)) { |
254 | last; |
255 | } |
256 | if ($val eq $target) { |
257 | $center = $counter; |
258 | } |
259 | } |
260 | $lines[$counter] = $line; |
261 | |
262 | $counter = $counter + 1; |
263 | } |
264 | } |
265 | |
266 | close(FILE); |
267 | |
268 | if ($counter == 0) { |
269 | print "No matching code found \n"; |
270 | exit; |
271 | } |
272 | |
273 | if ($center == -1) { |
274 | print "No matching code found \n"; |
275 | exit; |
276 | } |
277 | |
278 | my $start; |
279 | my $finish; |
280 | my $codelines = 0; |
281 | my $binarylines = 0; |
282 | # now we go up and down in the array to find how much we want to print |
283 | |
284 | $start = $center; |
285 | |
286 | while ($start > 1) { |
287 | $start = $start - 1; |
288 | my $line = $lines[$start]; |
289 | if ($line =~ /^([a-f0-9]+)\:/) { |
290 | $binarylines = $binarylines + 1; |
291 | } else { |
292 | $codelines = $codelines + 1; |
293 | } |
294 | if ($codelines > 10) { |
295 | last; |
296 | } |
297 | if ($binarylines > 20) { |
298 | last; |
299 | } |
300 | } |
301 | |
302 | |
303 | $finish = $center; |
304 | $codelines = 0; |
305 | $binarylines = 0; |
306 | while ($finish < $counter) { |
307 | $finish = $finish + 1; |
308 | my $line = $lines[$finish]; |
309 | if ($line =~ /^([a-f0-9]+)\:/) { |
310 | $binarylines = $binarylines + 1; |
311 | } else { |
312 | $codelines = $codelines + 1; |
313 | } |
314 | if ($codelines > 10) { |
315 | last; |
316 | } |
317 | if ($binarylines > 20) { |
318 | last; |
319 | } |
320 | } |
321 | |
322 | |
323 | my $i; |
324 | |
325 | |
326 | # start annotating the registers in the asm. |
327 | # this goes from the oopsing point back, so that the annotator |
328 | # can track (opportunistically) which registers got written and |
329 | # whos value no longer is relevant. |
330 | |
331 | $i = $center; |
332 | while ($i >= $start) { |
333 | $reglines[$i] = process_x86_regs($lines[$i], $center - $i); |
334 | $i = $i - 1; |
335 | } |
336 | |
337 | $i = $start; |
338 | while ($i < $finish) { |
339 | my $line; |
340 | if ($i == $center) { |
341 | $line = "*$lines[$i] "; |
342 | } else { |
343 | $line = " $lines[$i] "; |
344 | } |
345 | print $line; |
346 | if (defined($reglines[$i]) && length($reglines[$i]) > 0) { |
347 | my $c = 60 - length($line); |
348 | while ($c > 0) { print " "; $c = $c - 1; }; |
349 | print "| $reglines[$i]"; |
350 | } |
351 | if ($i == $center) { |
352 | print "<--- faulting instruction"; |
353 | } |
354 | print "\n"; |
355 | $i = $i +1; |
356 | } |
357 | |
358 | sub usage { |
359 | print <<EOT; |
360 | Usage: |
361 | dmesg | perl $0 [OPTION] [VMLINUX] |
362 | |
363 | OPTION: |
364 | -c, --cross-compile CROSS_COMPILE Specify the prefix used for toolchain. |
365 | -m, --module MODULE_DIRNAME Specify the module filename. |
366 | -h, --help Help. |
367 | EOT |
368 | exit; |
369 | } |
370 | |
371 |
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