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diff --git a/util/style/validators.py b/util/style/validators.py
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+#!/usr/bin/env python
+#
+# Copyright (c) 2014, 2016 ARM Limited
+# All rights reserved
+#
+# The license below extends only to copyright in the software and shall
+# not be construed as granting a license to any other intellectual
+# property including but not limited to intellectual property relating
+# to a hardware implementation of the functionality of the software
+# licensed hereunder.  You may use the software subject to the license
+# terms below provided that you ensure that this notice is replicated
+# unmodified and in its entirety in all distributions of the software,
+# modified or unmodified, in source code or in binary form.
+#
+# Copyright (c) 2006 The Regents of The University of Michigan
+# Copyright (c) 2007,2011 The Hewlett-Packard Development Company
+# Copyright (c) 2016 Advanced Micro Devices, Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Nathan Binkert
+#          Steve Reinhardt
+#          Andreas Sandberg
+
+from abc import ABCMeta, abstractmethod
+import inspect
+import re
+import sys
+
+import style
+
+tabsize = 8
+lead = re.compile(r'^([ \t]+)')
+trail = re.compile(r'([ \t]+)$')
+any_control = re.compile(r'\b(if|while|for)([ \t]*)\(')
+
+class Validator(object):
+    """Base class for style validators
+
+    Validators analyze source files for common style violations and
+    produce source code style violation statistics. Unlike style
+    verifiers (see verifiers.py), they do not try to fix any style
+    violations violations.
+
+    Deprecation warning: These classes are currently only used by the
+    "hg m5format" command and not by any style hooks. New style
+    checkers should inherit from Verifier instead of Validator.
+
+    """
+
+    __metaclass__ = ABCMeta
+
+    def __init__(self, file_name, verbose=False, language=None):
+        self.file_name = file_name
+        self.verbose = verbose
+        self.bad = 0
+        self.language = language
+
+    def fail_line(self, line_no, line, message):
+        print '%s:%d>' % (self.file_name, line_no + 1), message
+        if self.verbose:
+            print line
+        self.bad += 1
+
+    def __nonzero__(self):
+        return self.bad == 0
+
+    @classmethod
+    def supported_lang(cls, language):
+        return True
+
+    @abstractmethod
+    def validate_line(self, line_no, line):
+        pass
+
+    @abstractmethod
+    def dump(self):
+        pass
+
+class SimpleValidator(Validator):
+    supported_langs = set()
+
+    def __init__(self, fail_message, dump_message, file_name, **kwargs):
+        super(SimpleValidator, self).__init__(file_name, **kwargs)
+
+        self.fail_message = fail_message
+        self.dump_message = dump_message
+
+    @classmethod
+    def supported_lang(cls, language):
+        return not cls.cupported_langs or language in cls.supported_langs
+
+    def validate_line(self, line_no, line):
+        if not self.simple_validate_line(line):
+            self.fail_line(line_no, line, self.fail_message)
+            return False
+        else:
+            return True
+
+    @abstractmethod
+    def simple_validate_line(self, line):
+        pass
+
+    def dump(self):
+        print self.dump_message % {
+            "bad" : self.bad
+        }
+
+class LineLength(Validator):
+    def __init__(self, *args, **kwargs):
+        super(LineLength, self).__init__(*args, **kwargs)
+
+        self.toolong80 = 0
+
+    def validate_line(self, line_no, line):
+        llen = style.normalized_len(line)
+        if llen == 80:
+            self.toolong80 += 1
+
+        if llen > 79:
+            self.fail_line(line_no, line, 'line too long (%d chars)' % llen)
+            return False
+        else:
+            return True
+
+    def dump(self):
+        print "%d violations of lines over 79 chars. " \
+            "%d of which are 80 chars exactly." % (self.bad, self.toolong80)
+
+class ControlSpacing(Validator):
+    supported_langs = set(('C', 'C++'))
+
+    def validate_line(self, line_no, line):
+        match = any_control.search(line)
+        if match and match.group(2) != " ":
+            stats.badcontrol += 1
+            self.fail_line(line_no, line,
+                           'improper spacing after %s' % match.group(1))
+            return False
+        else:
+            return True
+
+    def dump(self):
+        print "%d bad parens after if/while/for." % (self.bad, )
+
+class CarriageReturn(SimpleValidator):
+    def __init__(self, *args, **kwargs):
+        super(CarriageReturn, self).__init__(
+            "carriage return found",
+            "%(bad)d carriage returns found.",
+            *args, **kwargs)
+
+    def simple_validate_line(self, line):
+        return line.find('\r') == -1
+
+class TabIndent(SimpleValidator):
+    lead = re.compile(r'^([ \t]+)')
+
+    def __init__(self, *args, **kwargs):
+        super(TabIndent, self).__init__(
+            "using tabs to indent",
+            "%(bad)d cases of tabs to indent.",
+            *args, **kwargs)
+
+    def simple_validate_line(self, line):
+        match = TabIndent.lead.search(line)
+        return not (match and match.group(1).find('\t') != -1)
+
+class TrailingWhitespace(SimpleValidator):
+    trail = re.compile(r'([ \t]+)$')
+
+    def __init__(self, *args, **kwargs):
+        super(TrailingWhitespace, self).__init__(
+            "trailing whitespace",
+            "%(bad)d cases of whitespace at the end of a line.",
+            *args, **kwargs)
+
+    def simple_validate_line(self, line):
+        return not TrailingWhitespace.trail.search(line)
+
+def is_validator(cls):
+    """Determine if a class is a Validator that can be instantiated"""
+
+    return inspect.isclass(cls) and issubclass(cls, Validator) and \
+        not inspect.isabstract(cls)
+
+# list of all verifier classes
+all_validators = [ v for n, v in \
+                  inspect.getmembers(sys.modules[__name__], is_validator) ]
+