#!/usr/bin/env python
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# Authors: Ali Saidi
#
# This python code is used to migrate checkpoints that were created in one
# version of the simulator to newer version. As features are added or bugs are
# fixed some of the state that needs to be checkpointed can change. If you have
# many historic checkpoints that you use, manually editing them to fix them is
# both time consuming and error-prone.
# This script provides a way to migrate checkpoints to the newer repository in
# a programatic way. It can be imported into another script or used on the
# command line. From the command line the script will either migrate every
# checkpoint it finds recursively (-r option) or a single checkpoint. When a
# change is made to the gem5 repository that breaks previous checkpoints a
# from_N() method should be implemented here and the gem5CheckpointVersion
# variable in src/sim/serialize.hh should be incremented. For each version
# between the checkpoints current version and the new version the from_N()
# method will be run, passing in a ConfigParser object which contains the open
# file. As these operations can be isa specific the method can verify the isa
# and use regexes to find the correct sections that need to be updated.
import ConfigParser
import sys, os
import os.path as osp
# An example of a translator
def from_0(cpt):
if cpt.get('root','isa') == 'arm':
for sec in cpt.sections():
import re
# Search for all the execution contexts
if re.search('.*sys.*\.cpu.*\.x.\..*', sec):
# Update each one
mr = cpt.get(sec, 'miscRegs').split()
#mr.insert(21,0)
#mr.insert(26,0)
cpt.set(sec, 'miscRegs', ' '.join(str(x) for x in mr))
# The backing store supporting the memories in the system has changed
# in that it is now stored globally per address range. As a result the
# actual storage is separate from the memory controllers themselves.
def from_1(cpt):
for sec in cpt.sections():
import re
# Search for a physical memory
if re.search('.*sys.*\.physmem$', sec):
# Add the number of stores attribute to the global physmem
cpt.set(sec, 'nbr_of_stores', '1')
# Get the filename and size as this is moving to the
# specific backing store
mem_filename = cpt.get(sec, 'filename')
mem_size = cpt.get(sec, '_size')
cpt.remove_option(sec, 'filename')
cpt.remove_option(sec, '_size')
# Get the name so that we can create the new section
system_name = str(sec).split('.')[0]
section_name = system_name + '.physmem.store0'
cpt.add_section(section_name)
cpt.set(section_name, 'store_id', '0')
cpt.set(section_name, 'range_size', mem_size)
cpt.set(section_name, 'filename', mem_filename)
elif re.search('.*sys.*\.\w*mem$', sec):
# Due to the lack of information about a start address,
# this migration only works if there is a single memory in
# the system, thus starting at 0
raise ValueError("more than one memory detected (" + sec + ")")
def from_2(cpt):
for sec in cpt.sections():
import re
# Search for a CPUs
if re.search('.*sys.*cpu', sec):
try:
junk = cpt.get(sec, 'instCnt')
cpt.set(sec, '_pid', '0')
except ConfigParser.NoOptionError:
pass
# The ISA is now a separate SimObject, which means that we serialize
# it in a separate section instead of as a part of the ThreadContext.
def from_3(cpt):
isa = cpt.get('root','isa')
isa_fields = {
"alpha" : ( "fpcr", "uniq", "lock_flag", "lock_addr", "ipr" ),
"arm" : ( "miscRegs" ),
"sparc" : ( "asi", "tick", "fprs", "gsr", "softint", "tick_cmpr",
"stick", "stick_cmpr", "tpc", "tnpc", "tstate", "tt",
"tba", "pstate", "tl", "pil", "cwp", "gl", "hpstate",
"htstate", "hintp", "htba", "hstick_cmpr",
"strandStatusReg", "fsr", "priContext", "secContext",
"partId", "lsuCtrlReg", "scratchPad",
"cpu_mondo_head", "cpu_mondo_tail",
"dev_mondo_head", "dev_mondo_tail",
"res_error_head", "res_error_tail",
"nres_error_head", "nres_error_tail",
"tick_intr_sched",
"cpu", "tc_num", "tick_cmp", "stick_cmp", "hstick_cmp"),
"x86" : ( "regVal" ),
}
isa_fields = isa_fields.get(isa, [])
isa_sections = []
for sec in cpt.sections():
import re
re_cpu_match = re.match('^(.*sys.*\.cpu[^.]*)\.xc\.(.+)$', sec)
# Search for all the execution contexts
if not re_cpu_match:
continue
if re_cpu_match.group(2) != "0":
# This shouldn't happen as we didn't support checkpointing
# of in-order and O3 CPUs.
raise ValueError("Don't know how to migrate multi-threaded CPUs "
"from version 1")
isa_section = []
for fspec in isa_fields:
for (key, value) in cpt.items(sec, raw=True):
if key in isa_fields:
isa_section.append((key, value))
name = "%s.isa" % re_cpu_match.group(1)
isa_sections.append((name, isa_section))
for (key, value) in isa_section:
cpt.remove_option(sec, key)
for (sec, options) in isa_sections:
# Some intermediate versions of gem5 have empty ISA sections
# (after we made the ISA a SimObject, but before we started to
# serialize into a separate ISA section).
if not cpt.has_section(sec):
cpt.add_section(sec)
else:
if cpt.items(sec):
raise ValueError("Unexpected populated ISA section in old "
"checkpoint")
for (key, value) in options:
cpt.set(sec, key, value)
# Version 5 of the checkpoint format removes the MISCREG_CPSR_MODE
# register from the ARM register file.
def from_4(cpt):
if cpt.get('root','isa') == 'arm':
for sec in cpt.sections():
import re
# Search for all ISA sections
if re.search('.*sys.*\.cpu.*\.isa', sec):
mr = cpt.get(sec, 'miscRegs').split()
# Remove MISCREG_CPSR_MODE
del mr[137]
cpt.set(sec, 'miscRegs', ' '.join(str(x) for x in mr))
migrations = []
migrations.append(from_0)
migrations.append(from_1)
migrations.append(from_2)
migrations.append(from_3)
migrations.append(from_4)
verbose_print = False
def verboseprint(*args):
if not verbose_print:
return
for arg in args:
print arg,
print
def process_file(path, **kwargs):
if not osp.isfile(path):
import errno
raise IOError(ennro.ENOENT, "No such file", path)
verboseprint("Processing file %s...." % path)
if kwargs.get('backup', True):
import shutil
shutil.copyfile(path, path + '.bak')
cpt = ConfigParser.SafeConfigParser()
# gem5 is case sensitive with paramaters
cpt.optionxform = str
# Read the current data
cpt_file = file(path, 'r')
cpt.readfp(cpt_file)
cpt_file.close()
# Make sure we know what we're starting from
if not cpt.has_option('root','cpt_ver'):
raise LookupError("cannot determine version of checkpoint")
cpt_ver = cpt.getint('root','cpt_ver')
# If the current checkpoint is longer than the migrations list, we have a problem
# and someone didn't update this file
if cpt_ver > len(migrations):
raise ValueError("upgrade script is too old and needs updating")
verboseprint("\t...file is at version %#x" % cpt_ver)
if cpt_ver == len(migrations):
verboseprint("\t...nothing to do")
return
# Walk through every function from now until the end fixing the checkpoint
for v in xrange(cpt_ver,len(migrations)):
verboseprint("\t...migrating to version %#x" % (v + 1))
migrations[v](cpt)
cpt.set('root','cpt_ver', str(v + 1))
# Write the old data back
verboseprint("\t...completed")
cpt.write(file(path, 'w'))
if __name__ == '__main__':
from optparse import OptionParser
parser = OptionParser("usage: %prog [options] <filename or directory>")
parser.add_option("-r", "--recurse", action="store_true",
help="Recurse through all subdirectories modifying "\
"each checkpoint that is found")
parser.add_option("-N", "--no-backup", action="store_false",
dest="backup", default=True,
help="Do no backup each checkpoint before modifying it")
parser.add_option("-v", "--verbose", action="store_true",
help="Print out debugging information as")
(options, args) = parser.parse_args()
if len(args) != 1:
parser.error("You must specify a checkpoint file to modify or a "\
"directory of checkpoints to recursively update")
verbose_print = options.verbose
# Deal with shell variables and ~
path = osp.expandvars(osp.expanduser(args[0]))
# Process a single file if we have it
if osp.isfile(path):
process_file(path, **vars(options))
# Process an entire directory
elif osp.isdir(path):
cpt_file = osp.join(path, 'm5.cpt')
if options.recurse:
# Visit very file and see if it matches
for root,dirs,files in os.walk(path):
for name in files:
if name == 'm5.cpt':
process_file(osp.join(root,name), **vars(options))
for dir in dirs:
pass
# Maybe someone passed a cpt.XXXXXXX directory and not m5.cpt
elif osp.isfile(cpt_file):
process_file(cpt_file, **vars(options))
else:
print "Error: checkpoint file not found at in %s " % path,
print "and recurse not specified"
sys.exit(1)
sys.exit(0)