perf tools: Fix build error on read only source.

[sfrench/cifs-2.6.git] / scripts / markup_oops.pl

diff --git a/scripts/markup_oops.pl b/scripts/markup_oops.pl
index e950f9cde0199194f8db3e0ceb4579178f186bbe..827896f56501aaebba885e70adc24a477fd31884 100644 (file)
--- a/scripts/markup_oops.pl
+++ b/scripts/markup_oops.pl
@@ -2,6 +2,7 @@
 
 use File::Basename;
 use Math::BigInt;
+use Getopt::Long;
 
 # Copyright 2008, Intel Corporation
 #
@@ -15,6 +16,16 @@ use Math::BigInt;
 #      Arjan van de Ven <arjan@linux.intel.com>
 
 
+my $cross_compile = "";
+my $vmlinux_name = "";
+my $modulefile = "";
+
+# Get options
+Getopt::Long::GetOptions(
+       'cross-compile|c=s'     => \$cross_compile,
+       'module|m=s'            => \$modulefile,
+       'help|h'                => \&usage,
+) || usage ();
 my $vmlinux_name = $ARGV[0];
 if (!defined($vmlinux_name)) {
        my $kerver = `uname -r`;
@@ -23,9 +34,8 @@ if (!defined($vmlinux_name)) {
        print "No vmlinux specified, assuming $vmlinux_name\n";
 }
 my $filename = $vmlinux_name;
-#
-# Step 1: Parse the oops to find the EIP value
-#
+
+# Parse the oops to find the EIP value
 
 my $target = "0";
 my $function;
@@ -177,26 +187,26 @@ my $decodestart = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("
 my $decodestop = Math::BigInt->from_hex("0x$target") + 8192;
 if ($target eq "0") {
        print "No oops found!\n";
-       print "Usage: \n";
-       print "    dmesg | perl scripts/markup_oops.pl vmlinux\n";
-       exit;
+       usage();
 }
 
 # if it's a module, we need to find the .ko file and calculate a load offset
 if ($module ne "") {
-       my $modulefile = `modinfo $module | grep '^filename:' | awk '{ print \$2 }'`;
-       chomp($modulefile);
+       if ($modulefile eq "") {
+               $modulefile = `modinfo -F filename $module`;
+               chomp($modulefile);
+       }
        $filename = $modulefile;
        if ($filename eq "") {
                print "Module .ko file for $module not found. Aborting\n";
                exit;
        }
        # ok so we found the module, now we need to calculate the vma offset
-       open(FILE, "objdump -dS $filename |") || die "Cannot start objdump";
+       open(FILE, $cross_compile."objdump -dS $filename |") || die "Cannot start objdump";
        while (<FILE>) {
                if ($_ =~ /^([0-9a-f]+) \<$function\>\:/) {
                        my $fu = $1;
-                       $vmaoffset = hex($target) - hex($fu) - hex($func_offset);
+                       $vmaoffset = Math::BigInt->from_hex("0x$target") - Math::BigInt->from_hex("0x$fu") - Math::BigInt->from_hex("0x$func_offset");
                }
        }
        close(FILE);
@@ -204,7 +214,7 @@ if ($module ne "") {
 
 my $counter = 0;
 my $state   = 0;
-my $center  = 0;
+my $center  = -1;
 my @lines;
 my @reglines;
 
@@ -212,7 +222,7 @@ sub InRange {
        my ($address, $target) = @_;
        my $ad = "0x".$address;
        my $ta = "0x".$target;
-       my $delta = hex($ad) - hex($ta);
+       my $delta = Math::BigInt->from_hex($ad) - Math::BigInt->from_hex($ta);
 
        if (($delta > -4096) && ($delta < 4096)) {
                return 1;
@@ -225,7 +235,7 @@ sub InRange {
 # first, parse the input into the lines array, but to keep size down,
 # we only do this for 4Kb around the sweet spot
 
-open(FILE, "objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump";
+open(FILE, $cross_compile."objdump -dS --adjust-vma=$vmaoffset --start-address=$decodestart --stop-address=$decodestop $filename |") || die "Cannot start objdump";
 
 while (<FILE>) {
        my $line = $_;
@@ -236,7 +246,8 @@ while (<FILE>) {
                                $state = 1;
                        }
                }
-       } else {
+       }
+       if ($state == 1) {
                if ($line =~ /^([a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]+)\:/) {
                        my $val = $1;
                        if (!InRange($val, $target)) {
@@ -259,7 +270,7 @@ if ($counter == 0) {
        exit;
 }
 
-if ($center == 0) {
+if ($center == -1) {
        print "No matching code found \n";
        exit;
 }
@@ -344,3 +355,16 @@ while ($i < $finish) {
        $i = $i +1;
 }
 
+sub usage {
+       print <<EOT;
+Usage:
+  dmesg | perl $0 [OPTION] [VMLINUX]
+
+OPTION:
+  -c, --cross-compile CROSS_COMPILE    Specify the prefix used for toolchain.
+  -m, --module MODULE_DIRNAME          Specify the module filename.
+  -h, --help                           Help.
+EOT
+       exit;
+}
+