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authorArjan van de Ven <arjan@linux.intel.com>2009-02-15 11:30:52 +0100
committerSam Ravnborg <sam@ravnborg.org>2009-02-15 12:50:10 +0100
commitc19ef7fd8e534c870166213e9e30de9c44b34a76 (patch)
tree163e722b2a0bc6370e27504e403c066dd306a096 /scripts/markup_oops.pl
parent5123b327c107db9e560fd62d50c27a3816e5a078 (diff)
downloadlinux-c19ef7fd8e534c870166213e9e30de9c44b34a76.tar.gz
scripts: add x86 register parser to markup_oops.pl
An oops dump also contains the register values. This patch parses these for (32 bit) x86, and then annotates the disassembly with these values; this helps in analysis of the oops by the developer, for example, NULL pointer or other pointer bugs show up clearly this way. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'scripts/markup_oops.pl')
-rw-r--r--scripts/markup_oops.pl106
1 files changed, 100 insertions, 6 deletions
diff --git a/scripts/markup_oops.pl b/scripts/markup_oops.pl
index d40449cafa84..bb2046891c90 100644
--- a/scripts/markup_oops.pl
+++ b/scripts/markup_oops.pl
@@ -32,6 +32,78 @@ my $module = "";
my $func_offset;
my $vmaoffset = 0;
+my %regs;
+
+
+sub parse_x86_regs
+{
+ my ($line) = @_;
+ if ($line =~ /EAX: ([0-9a-f]+) EBX: ([0-9a-f]+) ECX: ([0-9a-f]+) EDX: ([0-9a-f]+)/) {
+ $regs{"%eax"} = $1;
+ $regs{"%ebx"} = $2;
+ $regs{"%ecx"} = $3;
+ $regs{"%edx"} = $4;
+ }
+ if ($line =~ /ESI: ([0-9a-f]+) EDI: ([0-9a-f]+) EBP: ([0-9a-f]+) ESP: ([0-9a-f]+)/) {
+ $regs{"%esi"} = $1;
+ $regs{"%edi"} = $2;
+ $regs{"%esp"} = $4;
+ }
+}
+
+sub process_x86_regs
+{
+ my ($line, $cntr) = @_;
+ my $str = "";
+ if (length($line) < 40) {
+ return ""; # not an asm istruction
+ }
+
+ # find the arguments to the instruction
+ if ($line =~ /([0-9a-zA-Z\,\%\(\)\-\+]+)$/) {
+ $lastword = $1;
+ } else {
+ return "";
+ }
+
+ # we need to find the registers that get clobbered,
+ # since their value is no longer relevant for previous
+ # instructions in the stream.
+
+ $clobber = $lastword;
+ # first, remove all memory operands, they're read only
+ $clobber =~ s/\([a-z0-9\%\,]+\)//g;
+ # then, remove everything before the comma, thats the read part
+ $clobber =~ s/.*\,//g;
+
+ # if this is the instruction that faulted, we haven't actually done
+ # the write yet... nothing is clobbered.
+ if ($cntr == 0) {
+ $clobber = "";
+ }
+
+ foreach $reg (keys(%regs)) {
+ my $val = $regs{$reg};
+ # first check if we're clobbering this register; if we do
+ # we print it with a =>, and then delete its value
+ if ($clobber =~ /$reg/) {
+ if (length($val) > 0) {
+ $str = $str . " $reg => $val ";
+ }
+ $regs{$reg} = "";
+ $val = "";
+ }
+ # now check if we're reading this register
+ if ($lastword =~ /$reg/) {
+ if (length($val) > 0) {
+ $str = $str . " $reg = $val ";
+ }
+ }
+ }
+ return $str;
+}
+
+# parse the oops
while (<STDIN>) {
my $line = $_;
if ($line =~ /EIP: 0060:\[\<([a-z0-9]+)\>\]/) {
@@ -46,10 +118,11 @@ while (<STDIN>) {
if ($line =~ /EIP is at ([a-zA-Z0-9\_]+)\+(0x[0-9a-f]+)\/0x[a-f0-9]+\W\[([a-zA-Z0-9\_\-]+)\]/) {
$module = $3;
}
+ parse_x86_regs($line);
}
my $decodestart = hex($target) - hex($func_offset);
-my $decodestop = $decodestart + 8192;
+my $decodestop = hex($target) + 8192;
if ($target eq "0") {
print "No oops found!\n";
print "Usage: \n";
@@ -84,6 +157,7 @@ my $counter = 0;
my $state = 0;
my $center = 0;
my @lines;
+my @reglines;
sub InRange {
my ($address, $target) = @_;
@@ -188,16 +262,36 @@ while ($finish < $counter) {
my $i;
-my $fulltext = "";
+
+# start annotating the registers in the asm.
+# this goes from the oopsing point back, so that the annotator
+# can track (opportunistically) which registers got written and
+# whos value no longer is relevant.
+
+$i = $center;
+while ($i >= $start) {
+ $reglines[$i] = process_x86_regs($lines[$i], $center - $i);
+ $i = $i - 1;
+}
+
$i = $start;
while ($i < $finish) {
+ my $line;
if ($i == $center) {
- $fulltext = $fulltext . "*$lines[$i] <----- faulting instruction\n";
+ $line = "*$lines[$i] ";
} else {
- $fulltext = $fulltext . " $lines[$i]\n";
+ $line = " $lines[$i] ";
+ }
+ print $line;
+ if (defined($reglines[$i]) && length($reglines[$i]) > 0) {
+ my $c = 60 - length($line);
+ while ($c > 0) { print " "; $c = $c - 1; };
+ print "| $reglines[$i]";
}
+ if ($i == $center) {
+ print "<--- faulting instruction";
+ }
+ print "\n";
$i = $i +1;
}
-print $fulltext;
-