1 #!/usr/bin/env perl 1 #!/usr/bin/env perl
2 # SPDX-License-Identifier: GPL-2.0-only <<
3 2
4 use File::Basename; 3 use File::Basename;
5 use Math::BigInt; 4 use Math::BigInt;
6 use Getopt::Long; 5 use Getopt::Long;
7 6
8 # Copyright 2008, Intel Corporation 7 # Copyright 2008, Intel Corporation
9 # 8 #
10 # This file is part of the Linux kernel 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.
11 # 14 #
12 # Authors: 15 # Authors:
13 # Arjan van de Ven <arjan@linux.intel.com 16 # Arjan van de Ven <arjan@linux.intel.com>
14 17
15 18
16 my $cross_compile = ""; 19 my $cross_compile = "";
17 my $vmlinux_name = ""; 20 my $vmlinux_name = "";
18 my $modulefile = ""; 21 my $modulefile = "";
19 22
20 # Get options 23 # Get options
21 Getopt::Long::GetOptions( 24 Getopt::Long::GetOptions(
22 'cross-compile|c=s' => \$cross_com 25 'cross-compile|c=s' => \$cross_compile,
23 'module|m=s' => \$modulefil 26 'module|m=s' => \$modulefile,
24 'help|h' => \&usage, 27 'help|h' => \&usage,
25 ) || usage (); 28 ) || usage ();
26 my $vmlinux_name = $ARGV[0]; 29 my $vmlinux_name = $ARGV[0];
27 if (!defined($vmlinux_name)) { 30 if (!defined($vmlinux_name)) {
28 my $kerver = `uname -r`; 31 my $kerver = `uname -r`;
29 chomp($kerver); 32 chomp($kerver);
30 $vmlinux_name = "/lib/modules/$kerver/ 33 $vmlinux_name = "/lib/modules/$kerver/build/vmlinux";
31 print "No vmlinux specified, assuming 34 print "No vmlinux specified, assuming $vmlinux_name\n";
32 } 35 }
33 my $filename = $vmlinux_name; 36 my $filename = $vmlinux_name;
34 37
35 # Parse the oops to find the EIP value 38 # Parse the oops to find the EIP value
36 39
37 my $target = "0"; 40 my $target = "0";
38 my $function; 41 my $function;
39 my $module = ""; 42 my $module = "";
40 my $func_offset = 0; 43 my $func_offset = 0;
41 my $vmaoffset = 0; 44 my $vmaoffset = 0;
42 45
43 my %regs; 46 my %regs;
44 47
45 48
46 sub parse_x86_regs 49 sub parse_x86_regs
47 { 50 {
48 my ($line) = @_; 51 my ($line) = @_;
49 if ($line =~ /EAX: ([0-9a-f]+) EBX: ([ 52 if ($line =~ /EAX: ([0-9a-f]+) EBX: ([0-9a-f]+) ECX: ([0-9a-f]+) EDX: ([0-9a-f]+)/) {
50 $regs{"%eax"} = $1; 53 $regs{"%eax"} = $1;
51 $regs{"%ebx"} = $2; 54 $regs{"%ebx"} = $2;
52 $regs{"%ecx"} = $3; 55 $regs{"%ecx"} = $3;
53 $regs{"%edx"} = $4; 56 $regs{"%edx"} = $4;
54 } 57 }
55 if ($line =~ /ESI: ([0-9a-f]+) EDI: ([ 58 if ($line =~ /ESI: ([0-9a-f]+) EDI: ([0-9a-f]+) EBP: ([0-9a-f]+) ESP: ([0-9a-f]+)/) {
56 $regs{"%esi"} = $1; 59 $regs{"%esi"} = $1;
57 $regs{"%edi"} = $2; 60 $regs{"%edi"} = $2;
58 $regs{"%esp"} = $4; 61 $regs{"%esp"} = $4;
59 } 62 }
60 if ($line =~ /RAX: ([0-9a-f]+) RBX: ([ 63 if ($line =~ /RAX: ([0-9a-f]+) RBX: ([0-9a-f]+) RCX: ([0-9a-f]+)/) {
61 $regs{"%eax"} = $1; 64 $regs{"%eax"} = $1;
62 $regs{"%ebx"} = $2; 65 $regs{"%ebx"} = $2;
63 $regs{"%ecx"} = $3; 66 $regs{"%ecx"} = $3;
64 } 67 }
65 if ($line =~ /RDX: ([0-9a-f]+) RSI: ([ 68 if ($line =~ /RDX: ([0-9a-f]+) RSI: ([0-9a-f]+) RDI: ([0-9a-f]+)/) {
66 $regs{"%edx"} = $1; 69 $regs{"%edx"} = $1;
67 $regs{"%esi"} = $2; 70 $regs{"%esi"} = $2;
68 $regs{"%edi"} = $3; 71 $regs{"%edi"} = $3;
69 } 72 }
70 if ($line =~ /RBP: ([0-9a-f]+) R08: ([ 73 if ($line =~ /RBP: ([0-9a-f]+) R08: ([0-9a-f]+) R09: ([0-9a-f]+)/) {
71 $regs{"%r08"} = $2; 74 $regs{"%r08"} = $2;
72 $regs{"%r09"} = $3; 75 $regs{"%r09"} = $3;
73 } 76 }
74 if ($line =~ /R10: ([0-9a-f]+) R11: ([ 77 if ($line =~ /R10: ([0-9a-f]+) R11: ([0-9a-f]+) R12: ([0-9a-f]+)/) {
75 $regs{"%r10"} = $1; 78 $regs{"%r10"} = $1;
76 $regs{"%r11"} = $2; 79 $regs{"%r11"} = $2;
77 $regs{"%r12"} = $3; 80 $regs{"%r12"} = $3;
78 } 81 }
79 if ($line =~ /R13: ([0-9a-f]+) R14: ([ 82 if ($line =~ /R13: ([0-9a-f]+) R14: ([0-9a-f]+) R15: ([0-9a-f]+)/) {
80 $regs{"%r13"} = $1; 83 $regs{"%r13"} = $1;
81 $regs{"%r14"} = $2; 84 $regs{"%r14"} = $2;
82 $regs{"%r15"} = $3; 85 $regs{"%r15"} = $3;
83 } 86 }
84 } 87 }
85 88
86 sub reg_name 89 sub reg_name
87 { 90 {
88 my ($reg) = @_; 91 my ($reg) = @_;
89 $reg =~ s/r(.)x/e\1x/; 92 $reg =~ s/r(.)x/e\1x/;
90 $reg =~ s/r(.)i/e\1i/; 93 $reg =~ s/r(.)i/e\1i/;
91 $reg =~ s/r(.)p/e\1p/; 94 $reg =~ s/r(.)p/e\1p/;
92 return $reg; 95 return $reg;
93 } 96 }
94 97
95 sub process_x86_regs 98 sub process_x86_regs
96 { 99 {
97 my ($line, $cntr) = @_; 100 my ($line, $cntr) = @_;
98 my $str = ""; 101 my $str = "";
99 if (length($line) < 40) { 102 if (length($line) < 40) {
100 return ""; # not an asm istruc 103 return ""; # not an asm istruction
101 } 104 }
102 105
103 # find the arguments to the instructio 106 # find the arguments to the instruction
104 if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+] 107 if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+]+)$/) {
105 $lastword = $1; 108 $lastword = $1;
106 } else { 109 } else {
107 return ""; 110 return "";
108 } 111 }
109 112
110 # we need to find the registers that g 113 # we need to find the registers that get clobbered,
111 # since their value is no longer relev 114 # since their value is no longer relevant for previous
112 # instructions in the stream. 115 # instructions in the stream.
113 116
114 $clobber = $lastword; 117 $clobber = $lastword;
115 # first, remove all memory operands, t 118 # first, remove all memory operands, they're read only
116 $clobber =~ s/\([a-z0-9\%\,]+\)//g; 119 $clobber =~ s/\([a-z0-9\%\,]+\)//g;
117 # then, remove everything before the c 120 # then, remove everything before the comma, thats the read part
118 $clobber =~ s/.*\,//g; 121 $clobber =~ s/.*\,//g;
119 122
120 # if this is the instruction that faul 123 # if this is the instruction that faulted, we haven't actually done
121 # the write yet... nothing is clobbere 124 # the write yet... nothing is clobbered.
122 if ($cntr == 0) { 125 if ($cntr == 0) {
123 $clobber = ""; 126 $clobber = "";
124 } 127 }
125 128
126 foreach $reg (keys(%regs)) { 129 foreach $reg (keys(%regs)) {
127 my $clobberprime = reg_name($c 130 my $clobberprime = reg_name($clobber);
128 my $lastwordprime = reg_name($ 131 my $lastwordprime = reg_name($lastword);
129 my $val = $regs{$reg}; 132 my $val = $regs{$reg};
130 if ($val =~ /^[0]+$/) { 133 if ($val =~ /^[0]+$/) {
131 $val = "0"; 134 $val = "0";
132 } else { 135 } else {
133 $val =~ s/^0*//; 136 $val =~ s/^0*//;
134 } 137 }
135 138
136 # first check if we're clobber 139 # first check if we're clobbering this register; if we do
137 # we print it with a =>, and t 140 # we print it with a =>, and then delete its value
138 if ($clobber =~ /$reg/ || $clo 141 if ($clobber =~ /$reg/ || $clobberprime =~ /$reg/) {
139 if (length($val) > 0) 142 if (length($val) > 0) {
140 $str = $str . 143 $str = $str . " $reg => $val ";
141 } 144 }
142 $regs{$reg} = ""; 145 $regs{$reg} = "";
143 $val = ""; 146 $val = "";
144 } 147 }
145 # now check if we're reading t 148 # now check if we're reading this register
146 if ($lastword =~ /$reg/ || $la 149 if ($lastword =~ /$reg/ || $lastwordprime =~ /$reg/) {
147 if (length($val) > 0) 150 if (length($val) > 0) {
148 $str = $str . 151 $str = $str . " $reg = $val ";
149 } 152 }
150 } 153 }
151 } 154 }
152 return $str; 155 return $str;
153 } 156 }
154 157
155 # parse the oops 158 # parse the oops
156 while (<STDIN>) { 159 while (<STDIN>) {
157 my $line = $_; 160 my $line = $_;
158 if ($line =~ /EIP: 0060:\[\<([a-z0-9]+ 161 if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
159 $target = $1; 162 $target = $1;
160 } 163 }
161 if ($line =~ /RIP: 0010:\[\<([a-z0-9]+ 164 if ($line =~ /RIP: 0010:\[\<([a-z0-9]+)\>\]/) {
162 $target = $1; 165 $target = $1;
163 } 166 }
164 if ($line =~ /EIP is at ([a-zA-Z0-9\_] 167 if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+0x([0-9a-f]+)\/0x[a-f0-9]/) {
165 $function = $1; 168 $function = $1;
166 $func_offset = $2; 169 $func_offset = $2;
167 } 170 }
168 if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\ 171 if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+0x([0-9a-f]+)\/0x[a-f0-9]/) {
169 $function = $1; 172 $function = $1;
170 $func_offset = $2; 173 $func_offset = $2;
171 } 174 }
172 175
173 # check if it's a module 176 # check if it's a module
174 if ($line =~ /EIP is at ([a-zA-Z0-9\_] 177 if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) {
175 $module = $3; 178 $module = $3;
176 } 179 }
177 if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\ 180 if ($line =~ /RIP: 0010:\[\<[0-9a-f]+\>\] \[\<[0-9a-f]+\>\] ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) {
178 $module = $3; 181 $module = $3;
179 } 182 }
180 parse_x86_regs($line); 183 parse_x86_regs($line);
181 } 184 }
182 185
183 my $decodestart = Math::BigInt->from_hex("0x$t 186 my $decodestart = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$func_offset");
184 my $decodestop = Math::BigInt->from_hex("0x$ta 187 my $decodestop = Math::BigInt->from_hex("0x$target") + 8192;
185 if ($target eq "0") { 188 if ($target eq "0") {
186 print "No oops found!\n"; 189 print "No oops found!\n";
187 usage(); 190 usage();
188 } 191 }
189 192
190 # if it's a module, we need to find the .ko fi 193 # if it's a module, we need to find the .ko file and calculate a load offset
191 if ($module ne "") { 194 if ($module ne "") {
192 if ($modulefile eq "") { 195 if ($modulefile eq "") {
193 $modulefile = `modinfo -F file 196 $modulefile = `modinfo -F filename $module`;
194 chomp($modulefile); 197 chomp($modulefile);
195 } 198 }
196 $filename = $modulefile; 199 $filename = $modulefile;
197 if ($filename eq "") { 200 if ($filename eq "") {
198 print "Module .ko file for $mo 201 print "Module .ko file for $module not found. Aborting\n";
199 exit; 202 exit;
200 } 203 }
201 # ok so we found the module, now we ne 204 # ok so we found the module, now we need to calculate the vma offset
202 open(FILE, $cross_compile."objdump -dS 205 open(FILE, $cross_compile."objdump -dS $filename |") || die "Cannot start objdump";
203 while (<FILE>) { 206 while (<FILE>) {
204 if ($_ =~ /^([0-9a-f]+) \<$fun 207 if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) {
205 my $fu = $1; 208 my $fu = $1;
206 $vmaoffset = Math::Big 209 $vmaoffset = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$fu") - Math::BigInt->from_hex("0x$func_offset");
207 } 210 }
208 } 211 }
209 close(FILE); 212 close(FILE);
210 } 213 }
211 214
212 my $counter = 0; 215 my $counter = 0;
213 my $state = 0; 216 my $state = 0;
214 my $center = -1; 217 my $center = -1;
215 my @lines; 218 my @lines;
216 my @reglines; 219 my @reglines;
217 220
218 sub InRange { 221 sub InRange {
219 my ($address, $target) = @_; 222 my ($address, $target) = @_;
220 my $ad = "0x".$address; 223 my $ad = "0x".$address;
221 my $ta = "0x".$target; 224 my $ta = "0x".$target;
222 my $delta = Math::BigInt->from_hex($ad 225 my $delta = Math::BigInt->from_hex($ad) - Math::BigInt->from_hex($ta);
223 226
224 if (($delta > -4096) && ($delta < 4096 227 if (($delta > -4096) && ($delta < 4096)) {
225 return 1; 228 return 1;
226 } 229 }
227 return 0; 230 return 0;
228 } 231 }
229 232
230 233
231 234
232 # first, parse the input into the lines array, 235 # first, parse the input into the lines array, but to keep size down,
233 # we only do this for 4Kb around the sweet spo 236 # we only do this for 4Kb around the sweet spot
234 237
235 open(FILE, $cross_compile."objdump -dS --adjus 238 open(FILE, $cross_compile."objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump";
236 239
237 while (<FILE>) { 240 while (<FILE>) {
238 my $line = $_; 241 my $line = $_;
239 chomp($line); 242 chomp($line);
240 if ($state == 0) { 243 if ($state == 0) {
241 if ($line =~ /^([a-f0-9]+)\:/) 244 if ($line =~ /^([a-f0-9]+)\:/) {
242 if (InRange($1, $targe 245 if (InRange($1, $target)) {
243 $state = 1; 246 $state = 1;
244 } 247 }
245 } 248 }
246 } 249 }
247 if ($state == 1) { 250 if ($state == 1) {
248 if ($line =~ /^([a-f0-9][a-f0- 251 if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) {
249 my $val = $1; 252 my $val = $1;
250 if (!InRange($val, $ta 253 if (!InRange($val, $target)) {
251 last; 254 last;
252 } 255 }
253 if ($val eq $target) { 256 if ($val eq $target) {
254 $center = $cou 257 $center = $counter;
255 } 258 }
256 } 259 }
257 $lines[$counter] = $line; 260 $lines[$counter] = $line;
258 261
259 $counter = $counter + 1; 262 $counter = $counter + 1;
260 } 263 }
261 } 264 }
262 265
263 close(FILE); 266 close(FILE);
264 267
265 if ($counter == 0) { 268 if ($counter == 0) {
266 print "No matching code found \n"; 269 print "No matching code found \n";
267 exit; 270 exit;
268 } 271 }
269 272
270 if ($center == -1) { 273 if ($center == -1) {
271 print "No matching code found \n"; 274 print "No matching code found \n";
272 exit; 275 exit;
273 } 276 }
274 277
275 my $start; 278 my $start;
276 my $finish; 279 my $finish;
277 my $codelines = 0; 280 my $codelines = 0;
278 my $binarylines = 0; 281 my $binarylines = 0;
279 # now we go up and down in the array to find h 282 # now we go up and down in the array to find how much we want to print
280 283
281 $start = $center; 284 $start = $center;
282 285
283 while ($start > 1) { 286 while ($start > 1) {
284 $start = $start - 1; 287 $start = $start - 1;
285 my $line = $lines[$start]; 288 my $line = $lines[$start];
286 if ($line =~ /^([a-f0-9]+)\:/) { 289 if ($line =~ /^([a-f0-9]+)\:/) {
287 $binarylines = $binarylines + 290 $binarylines = $binarylines + 1;
288 } else { 291 } else {
289 $codelines = $codelines + 1; 292 $codelines = $codelines + 1;
290 } 293 }
291 if ($codelines > 10) { 294 if ($codelines > 10) {
292 last; 295 last;
293 } 296 }
294 if ($binarylines > 20) { 297 if ($binarylines > 20) {
295 last; 298 last;
296 } 299 }
297 } 300 }
298 301
299 302
300 $finish = $center; 303 $finish = $center;
301 $codelines = 0; 304 $codelines = 0;
302 $binarylines = 0; 305 $binarylines = 0;
303 while ($finish < $counter) { 306 while ($finish < $counter) {
304 $finish = $finish + 1; 307 $finish = $finish + 1;
305 my $line = $lines[$finish]; 308 my $line = $lines[$finish];
306 if ($line =~ /^([a-f0-9]+)\:/) { 309 if ($line =~ /^([a-f0-9]+)\:/) {
307 $binarylines = $binarylines + 310 $binarylines = $binarylines + 1;
308 } else { 311 } else {
309 $codelines = $codelines + 1; 312 $codelines = $codelines + 1;
310 } 313 }
311 if ($codelines > 10) { 314 if ($codelines > 10) {
312 last; 315 last;
313 } 316 }
314 if ($binarylines > 20) { 317 if ($binarylines > 20) {
315 last; 318 last;
316 } 319 }
317 } 320 }
318 321
319 322
320 my $i; 323 my $i;
321 324
322 325
323 # start annotating the registers in the asm. 326 # start annotating the registers in the asm.
324 # this goes from the oopsing point back, so th 327 # this goes from the oopsing point back, so that the annotator
325 # can track (opportunistically) which register 328 # can track (opportunistically) which registers got written and
326 # whos value no longer is relevant. 329 # whos value no longer is relevant.
327 330
328 $i = $center; 331 $i = $center;
329 while ($i >= $start) { 332 while ($i >= $start) {
330 $reglines[$i] = process_x86_regs($line 333 $reglines[$i] = process_x86_regs($lines[$i], $center - $i);
331 $i = $i - 1; 334 $i = $i - 1;
332 } 335 }
333 336
334 $i = $start; 337 $i = $start;
335 while ($i < $finish) { 338 while ($i < $finish) {
336 my $line; 339 my $line;
337 if ($i == $center) { 340 if ($i == $center) {
338 $line = "*$lines[$i] "; 341 $line = "*$lines[$i] ";
339 } else { 342 } else {
340 $line = " $lines[$i] "; 343 $line = " $lines[$i] ";
341 } 344 }
342 print $line; 345 print $line;
343 if (defined($reglines[$i]) && length($ 346 if (defined($reglines[$i]) && length($reglines[$i]) > 0) {
344 my $c = 60 - length($line); 347 my $c = 60 - length($line);
345 while ($c > 0) { print " "; $c 348 while ($c > 0) { print " "; $c = $c - 1; };
346 print "| $reglines[$i]"; 349 print "| $reglines[$i]";
347 } 350 }
348 if ($i == $center) { 351 if ($i == $center) {
349 print "<--- faulting instructi 352 print "<--- faulting instruction";
350 } 353 }
351 print "\n"; 354 print "\n";
352 $i = $i +1; 355 $i = $i +1;
353 } 356 }
354 357
355 sub usage { 358 sub usage {
356 print <<EOT; 359 print <<EOT;
357 Usage: 360 Usage:
358 dmesg | perl $0 [OPTION] [VMLINUX] 361 dmesg | perl $0 [OPTION] [VMLINUX]
359 362
360 OPTION: 363 OPTION:
361 -c, --cross-compile CROSS_COMPILE Specif 364 -c, --cross-compile CROSS_COMPILE Specify the prefix used for toolchain.
362 -m, --module MODULE_DIRNAME Specif 365 -m, --module MODULE_DIRNAME Specify the module filename.
363 -h, --help Help. 366 -h, --help Help.
364 EOT 367 EOT
365 exit; 368 exit;
366 } 369 }
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