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80 lines
2.8 KiB
80 lines
2.8 KiB
5 months ago
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#! /usr/bin/perl
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#
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# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License, version 2.0,
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# as published by the Free Software Foundation.
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#
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# This program is also distributed with certain software (including
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# but not limited to OpenSSL) that is licensed under separate terms,
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# as designated in a particular file or component or in included license
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# documentation. The authors of MySQL hereby grant you an additional
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# permission to link the program and your derivative works with the
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# separately licensed software that they have included with MySQL.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License, version 2.0, for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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#
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# Randomize each .text and .data name (unless it is already randomized),
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# so that we get a different order of all the symbols in the final binary
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# (assuming -ffunction-sections -fdata-sections and -Wl,--sort-section=name).
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# This makes it possible to see if a performance change is due to
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# semirandom address positioning effects or a genuine change that will be
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# robust to other, unrelated changes.
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#
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# Usage: randomize-order.pl SEED [OBJFILES...]
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use strict;
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use warnings;
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use Digest::SHA;
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my $seed = shift @ARGV;
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for my $objfile (@ARGV) {
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my @objcopy_args = ();
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# Read in the list of sections, and find all that start with .text or .data.
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open my $objdumpfh, "-|", "objdump", "-h", $objfile
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or die "objdump: $!";
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while (<$objdumpfh>) {
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chomp;
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if (/^\s*\d+\s*(\.text|\.data)\.(\S+)\s*/) {
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my ($section_type, $section_name) = ($1, $2);
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# Leave already reordered sections alone.
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next if ($section_name =~ /\.__random_order$/);
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my $new_name = Digest::SHA::sha256_hex($seed . $section_name) . ".__random_order";
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push @objcopy_args, "--rename=$section_type.$section_name=$section_type.$new_name";
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}
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}
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close $objdumpfh;
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while (scalar @objcopy_args > 0) {
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# Some targets are too big for one objcopy run in debug mode
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# (the command line gets too long); split into smaller chunks.
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my @args;
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if (scalar @objcopy_args >= 4096) {
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@args = @objcopy_args[0..4095];
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@objcopy_args = @objcopy_args[4096..$#objcopy_args];
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} else {
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@args = @objcopy_args;
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@objcopy_args = ();
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}
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system("objcopy", @args, $objfile, "$objfile.tmp") == 0
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or die "objcopy: $?";
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rename("$objfile.tmp", $objfile)
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or die "rename($objfile): $!";
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}
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}
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