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#!/usr/bin/perl -w
#
# Copyright (c) 2012 Joel Sing <jsing@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
#
# Ensure that the file offset for .text and .data aligns with the LMA. If they
# do not match boot(8) will fail since biosboot(8) does not perform relocation.
#
$LINKBASE = 0x40000;
if (scalar(@ARGV) != 1) {
print "Usage: check-boot.pl boot\n";
exit(2);
}
$boot = shift @ARGV;
if (! -f $boot) {
print "No such file - $boot\n";
exit(2);
}
$valid = 1;
$sections = 0;
open(OBJDUMP, "/usr/bin/objdump -h $boot |") || die "Failed to run objdump";
while (<OBJDUMP>) {
@section = split / +/, $_;
next if scalar(@section) < 7;
if ($section[2] =~ /(\.(text|data))/) {
$name = $1;
$lma = hex($section[5]);
$fileoff = hex($section[6]);
$offset = $lma - $LINKBASE;
$sections++;
if ($fileoff != $offset) {
printf "$name has incorrect file offset " .
"0x%x (should be 0x%x)\n", $fileoff, $offset;
$valid = 0;
}
}
}
close(OBJDUMP);
if ($sections != 2) {
print "Failed to find .text or .data section!\n";
exit(1);
}
exit(1) if ! $valid;
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