configs: Fix Python 3 iterator and exec compatibility issues

Python 2.7 used to return lists for operations such as map and range,
this has changed in Python 3. To make the configs Python 3 compliant,
add explicit conversions from iterators to lists where needed, replace
xrange with range, and fix changes to exec syntax.

This change doesn't fix import paths since that might require us to
restructure the configs slightly.

Change-Id: Idcea8482b286779fc98b4e144ca8f54069c08024
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/16002
Reviewed-by: Gabe Black <gabeblack@google.com>

configs/common/cpu2000.py

@@ -93,13 +93,13 @@ class Benchmark(object):
         try:
             func = getattr(self.__class__, input_set)
         except AttributeError:
-            raise AttributeError, \
-                  'The benchmark %s does not have the %s input set' % \
-                  (self.name, input_set)
+            raise AttributeError(
+                'The benchmark %s does not have the %s input set' % \
+                (self.name, input_set))
 
         executable = joinpath(spec_dist, 'binaries', isa, os, self.binary)
         if not isfile(executable):
-            raise AttributeError, '%s not found' % executable
+            raise AttributeError('%s not found' % executable)
         self.executable = executable
 
         # root of tree for input & output data files
@@ -113,7 +113,7 @@ class Benchmark(object):
         self.input_set = input_set
 
         if not isdir(inputs_dir):
-            raise AttributeError, '%s not found' % inputs_dir
+            raise AttributeError('%s not found' % inputs_dir)
 
         self.inputs_dir = [ inputs_dir ]
         if isdir(all_dir):
@@ -670,7 +670,7 @@ class vortex(Benchmark):
         elif (isa == 'sparc' or isa == 'sparc32'):
             self.endian = 'bendian'
         else:
-            raise AttributeError, "unknown ISA %s" % isa
+            raise AttributeError("unknown ISA %s" % isa)
 
         super(vortex, self).__init__(isa, os, input_set)