/usr/lib/xen-4.6/bin/xencov_split is in xen-utils-4.6 4.6.0-1ubuntu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | #!/usr/bin/perl
# xencov_split - split coverage information from Xen
#
# Copyright (C) 2013 - Citrix Systems
# -----
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; If not, see <http://www.gnu.org/licenses/>.
use strict;
use File::Path qw(mkpath);
# some magic constants
my $magic = 0x67636461;
my $ctrBase = 0x01a10000;
my $xenMagic = 0x58544346; # file header
my $xenTagFunc = 0x58544366; # functions tag
my $xenTagCount0 = 0x58544330; # counter 0 tag
my $xenTagEnd = 0x5854432e; # end file
# open input file
if ($ARGV[0]) {
my $fn = $ARGV[0];
open(IN, '<', $fn) or die "opening file \"$fn\"";
} else {
open(IN, '<&STDIN') or die "redirecting input";
}
my $pos = 0;
sub getRaw($)
{
my $l = shift;
die 'got no data to read' if $l < 0;
my $res = '';
do {
my $data;
my $r = read(IN, $data, $l);
die "error $! reading data from input at position $pos" if !defined($r);
die "unexpected end of file at position $pos" if !$r;
$l -= $r;
$pos += $r;
$res .= $data;
} while ($l > 0);
return $res;
}
sub get32()
{
return unpack('V', getRaw(4));
}
sub get64()
{
# This is returned as raw data as some Perl version could not
# support 64 bit integer
# This is ok for little endian machines
return getRaw(8);
}
sub align()
{
my $l = $pos & 7;
getRaw(8-$l) if $l;
}
# read a string prefixed by length
sub getS()
{
my $l = get32();
my $res = getRaw($l);
align();
return $res;
}
sub parseFunctions($)
{
my $numCounters = shift;
my $num = get32();
my @funcs;
for my $n (1..$num) {
my @data;
my $ident = get32();
my $checksum = get32();
for my $n (1..$numCounters) {
push @data, get32(); # number of counters for a type
}
push @funcs, [$ident, $checksum, \@data];
}
align();
return @funcs;
}
sub parseCounters($)
{
my $tag = shift;
die sprintf("wrong tag 0x%08x pos $pos (0x%08x)", $tag, $pos) if $tag < $xenTagCount0;
$tag -= $xenTagCount0;
die sprintf('wrong tag 0x%08x', $tag) if $tag > 5;
my $data = '';
my $num = get32();
for my $n (1..$num) {
$data .= get64();
}
align();
return [$tag, $data];
}
sub parseFile()
{
my $ver = get32();
my $stamp = get32();
my $fn = getS();
align();
my $numCounters;
print "got file $fn\n";
die if $fn !~ m,^(/.*?)[^/]+\.gcda$,;
mkpath(".$1");
open(OUT, '>', ".$fn") or die;
print OUT pack('VVV', $magic, $ver, $stamp);
# read counters of file
my @ctrs;
my @funcs;
my $tag;
for (;;) {
$tag = get32();
last if ($tag == $xenMagic || $tag == $xenTagEnd);
if ($tag == $xenTagFunc) {
die if scalar(@funcs);
@funcs = parseFunctions(scalar(@ctrs));
next;
}
# must be a counter
push @ctrs, parseCounters($tag);
++$numCounters;
}
# print all functions
for my $f (@funcs) {
# tag tag_len ident checksum
print OUT pack('VVVV', 0x01000000, 2, $f->[0], $f->[1]);
# all counts
my $n = 0;
for my $c (@{$f->[2]}) {
my ($type, $data) = @{$ctrs[$n]};
print OUT pack('VV', $ctrBase + 0x20000 * $type, $c*2);
die "--$c--$type--$data--" if length($data) < $c * 8;
print OUT substr($data, 0, $c * 8);
$ctrs[$n] = [$type, substr($data, $c * 8)];
++$n;
}
}
close(OUT);
return $tag;
}
my $tag = get32();
die 'no coverage or wrong file format' if $tag != $xenMagic;
for (;;) {
if ($tag == $xenMagic) {
$tag = parseFile();
} elsif ($tag == $xenTagEnd) {
last;
} else {
die "wrong tag $tag";
}
}
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