xref: /linux-6.15/scripts/markup_oops.pl (revision 2e4c77be) 
1#!/usr/bin/perl -w
2
3# Copyright 2008, Intel Corporation
4#
5# This file is part of the Linux kernel
6#
7# This program file is free software; you can redistribute it and/or modify it
8# under the terms of the GNU General Public License as published by the
9# Free Software Foundation; version 2 of the License.
10#
11# Authors:
12# 	Arjan van de Ven <[email protected]>
13
14
15my $vmlinux_name = $ARGV[0];
16
17#
18# Step 1: Parse the oops to find the EIP value
19#
20
21my $target = "0";
22while (<STDIN>) {
23	if ($_ =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
24		$target = $1;
25	}
26}
27
28if ($target =~ /^f8/) {
29	print "This script does not work on modules ... \n";
30	exit;
31}
32
33if ($target eq "0") {
34	print "No oops found!\n";
35	print "Usage: \n";
36	print "    dmesg | perl scripts/markup_oops.pl vmlinux\n";
37	exit;
38}
39
40my $counter = 0;
41my $state   = 0;
42my $center  = 0;
43my @lines;
44
45sub InRange {
46	my ($address, $target) = @_;
47	my $ad = "0x".$address;
48	my $ta = "0x".$target;
49	my $delta = hex($ad) - hex($ta);
50
51	if (($delta > -4096) && ($delta < 4096)) {
52		return 1;
53	}
54	return 0;
55}
56
57
58
59# first, parse the input into the lines array, but to keep size down,
60# we only do this for 4Kb around the sweet spot
61
62my $filename;
63
64open(FILE, "objdump -dS $vmlinux_name |") || die "Cannot start objdump";
65
66while (<FILE>) {
67	my $line = $_;
68	chomp($line);
69	if ($state == 0) {
70		if ($line =~ /^([a-f0-9]+)\:/) {
71			if (InRange($1, $target)) {
72				$state = 1;
73			}
74		}
75	} else {
76		if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) {
77			my $val = $1;
78			if (!InRange($val, $target)) {
79				last;
80			}
81			if ($val eq $target) {
82				$center = $counter;
83			}
84		}
85		$lines[$counter] = $line;
86
87		$counter = $counter + 1;
88	}
89}
90
91close(FILE);
92
93if ($counter == 0) {
94	print "No matching code found \n";
95	exit;
96}
97
98if ($center == 0) {
99	print "No matching code found \n";
100	exit;
101}
102
103my $start;
104my $finish;
105my $codelines = 0;
106my $binarylines = 0;
107# now we go up and down in the array to find how much we want to print
108
109$start = $center;
110
111while ($start > 1) {
112	$start = $start - 1;
113	my $line = $lines[$start];
114	if ($line =~ /^([a-f0-9]+)\:/) {
115		$binarylines = $binarylines + 1;
116	} else {
117		$codelines = $codelines + 1;
118	}
119	if ($codelines > 10) {
120		last;
121	}
122	if ($binarylines > 20) {
123		last;
124	}
125}
126
127
128$finish = $center;
129$codelines = 0;
130$binarylines = 0;
131while ($finish < $counter) {
132	$finish = $finish + 1;
133	my $line = $lines[$finish];
134	if ($line =~ /^([a-f0-9]+)\:/) {
135		$binarylines = $binarylines + 1;
136	} else {
137		$codelines = $codelines + 1;
138	}
139	if ($codelines > 10) {
140		last;
141	}
142	if ($binarylines > 20) {
143		last;
144	}
145}
146
147
148my $i;
149
150my $fulltext = "";
151$i = $start;
152while ($i < $finish) {
153	if ($i == $center) {
154		$fulltext = $fulltext . "*$lines[$i]     <----- faulting instruction\n";
155	} else {
156		$fulltext = $fulltext .  " $lines[$i]\n";
157	}
158	$i = $i +1;
159}
160
161print $fulltext;
162
163