gem5/util/cpt_upgrader.py

#!/usr/bin/env python

# Copyright (c) 2012-2013 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.
#
# 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: 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))

# Version 6 of the checkpoint format adds tlb to x86 checkpoints
def from_5(cpt):
    if cpt.get('root','isa') == 'x86':
        for sec in cpt.sections():
            import re
            # Search for all ISA sections
            if re.search('.*sys.*\.cpu.*\.dtb$', sec):
                cpt.set(sec, '_size', '0')
                cpt.set(sec, 'lruSeq', '0')

            if re.search('.*sys.*\.cpu.*\.itb$', sec):
                cpt.set(sec, '_size', '0')
                cpt.set(sec, 'lruSeq', '0')
    else:
        print "ISA is not x86"

# Version 7 of the checkpoint adds support for the IDE dmaAbort flag
def from_6(cpt):
    # Update IDE disk devices with dmaAborted
    for sec in cpt.sections():
        # curSector only exists in IDE devices, so key on that attribute
        if cpt.has_option(sec, "curSector"):
            cpt.set(sec, "dmaAborted", "false")

# Version 8 of the checkpoint adds an ARM MISCREG
def from_7(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()
                if len(mr) == 161:
                    print "MISCREG_TEEHBR already seems to be inserted."
                else:
                    # Add dummy value for MISCREG_TEEHBR
                    mr.insert(51,0);
                    cpt.set(sec, 'miscRegs', ' '.join(str(x) for x in mr))

# Version 9 of the checkpoint adds an all ARMv8 state
def from_8(cpt):
    if cpt.get('root','isa') != 'arm':
        return
    import re
    print "Warning: The size of the FP register file has changed. "\
          "To get similar results you need to adjust the number of "\
          "physical registers in the CPU you're restoring into by "\
          "NNNN."
    # Find the CPU context's and upgrade their registers
    for sec in cpt.sections():
        re_xc_match = re.match('^.*?sys.*?\.cpu(\d+)*\.xc\.*', sec)
        if not re_xc_match:
            continue

        # Update floating point regs
        fpr = cpt.get(sec, 'floatRegs.i').split()
        # v8 has 128 normal fp and 32 special fp regs compared
        # to v7's 64 normal fp and 8 special fp regs.
        # Insert the extra normal fp registers at end of v7 normal fp regs
        for x in xrange(64):
            fpr.insert(64, "0")
        # Append the extra special registers
        for x in xrange(24):
            fpr.append("0")
        cpt.set(sec, 'floatRegs.i', ' '.join(str(x) for x in fpr))

        ir = cpt.get(sec, 'intRegs').split()
        # Add in v8 int reg state
        # Splice in R13_HYP
        ir.insert(20, "0")
        # Splice in INTREG_DUMMY and SP0 - SP3
        ir.extend(["0", "0", "0", "0", "0"])
        cpt.set(sec, 'intRegs', ' '.join(str(x) for x in ir))

    # Update the cpu interrupt field
    for sec in cpt.sections():
        re_int_match = re.match("^.*?sys.*?\.cpu(\d+)*$", sec)
        if not re_int_match:
            continue

        irqs = cpt.get(sec, "interrupts").split()
        irqs.append("false")
        irqs.append("false")
        cpt.set(sec, "interrupts", ' '.join(str(x) for x in irqs))

    # Update the per cpu interrupt structure
    for sec in cpt.sections():
        re_int_match = re.match("^.*?sys.*?\.cpu(\d+)*\.interrupts$", sec)
        if not re_int_match:
            continue

        irqs = cpt.get(sec, "interrupts").split()
        irqs.append("false")
        irqs.append("false")
        cpt.set(sec, "interrupts", ' '.join(str(x) for x in irqs))

    # Update the misc regs and add in new isa specific fields
    for sec in cpt.sections():
        re_isa_match = re.match("^.*?sys.*?\.cpu(\d+)*\.isa$", sec)
        if not re_isa_match:
            continue

        cpt.set(sec, 'haveSecurity', 'false')
        cpt.set(sec, 'haveLPAE', 'false')
        cpt.set(sec, 'haveVirtualization', 'false')
        cpt.set(sec, 'haveLargeAsid64', 'false')
        cpt.set(sec, 'physAddrRange64', '40')

        # splice in the new misc registers, ~200 -> 605 registers,
        # ordering does not remain consistent
        mr_old = cpt.get(sec, 'miscRegs').split()
        mr_new = [ '0' for x in xrange(605) ]

        # map old v7 miscRegs to new v8 miscRegs
        mr_new[0] = mr_old[0] # CPSR
        mr_new[16] = mr_old[1] # CPSR_Q
        mr_new[1] = mr_old[2] # SPSR
        mr_new[2] = mr_old[3] # SPSR_FIQ
        mr_new[3] = mr_old[4] # SPSR_IRQ
        mr_new[4] = mr_old[5] # SPSR_SVC
        mr_new[5] = mr_old[6] # SPSR_MON
        mr_new[8] = mr_old[7] # SPSR_UND
        mr_new[6] = mr_old[8] # SPSR_ABT
        mr_new[432] = mr_old[9] # FPSR
        mr_new[10] = mr_old[10] # FPSID
        mr_new[11] = mr_old[11] # FPSCR
        mr_new[18] = mr_old[12] # FPSCR_QC
        mr_new[17] = mr_old[13] # FPSCR_EXC
        mr_new[14] = mr_old[14] # FPEXC
        mr_new[13] = mr_old[15] # MVFR0
        mr_new[12] = mr_old[16] # MVFR1
        mr_new[28] = mr_old[17] # SCTLR_RST,
        mr_new[29] = mr_old[18] # SEV_MAILBOX,
        mr_new[30] = mr_old[19] # DBGDIDR
        mr_new[31] = mr_old[20] # DBGDSCR_INT,
        mr_new[33] = mr_old[21] # DBGDTRRX_INT,
        mr_new[34] = mr_old[22] # DBGTRTX_INT,
        mr_new[35] = mr_old[23] # DBGWFAR,
        mr_new[36] = mr_old[24] # DBGVCR,
        #mr_new[] = mr_old[25] # DBGECR -> UNUSED,
        #mr_new[] = mr_old[26] # DBGDSCCR -> UNUSED,
        #mr_new[] = mr_old[27] # DBGSMCR -> UNUSED,
        mr_new[37] = mr_old[28] # DBGDTRRX_EXT,
        mr_new[38] = mr_old[29] # DBGDSCR_EXT,
        mr_new[39] = mr_old[30] # DBGDTRTX_EXT,
        #mr_new[] = mr_old[31] # DBGDRCR -> UNUSED,
        mr_new[41] = mr_old[32] # DBGBVR,
        mr_new[47] = mr_old[33] # DBGBCR,
        #mr_new[] = mr_old[34] # DBGBVR_M -> UNUSED,
        #mr_new[] = mr_old[35] # DBGBCR_M -> UNUSED,
        mr_new[61] = mr_old[36] # DBGDRAR,
        #mr_new[] = mr_old[37] # DBGBXVR_M -> UNUSED,
        mr_new[64] = mr_old[38] # DBGOSLAR,
        #mr_new[] = mr_old[39] # DBGOSSRR -> UNUSED,
        mr_new[66] = mr_old[40] # DBGOSDLR,
        mr_new[67] = mr_old[41] # DBGPRCR,
        #mr_new[] = mr_old[42] # DBGPRSR -> UNUSED,
        mr_new[68] = mr_old[43] # DBGDSAR,
        #mr_new[] = mr_old[44] # DBGITCTRL -> UNUSED,
        mr_new[69] = mr_old[45] # DBGCLAIMSET,
        mr_new[70] = mr_old[46] # DBGCLAIMCLR,
        mr_new[71] = mr_old[47] # DBGAUTHSTATUS,
        mr_new[72] = mr_old[48] # DBGDEVID2,
        mr_new[73] = mr_old[49] # DBGDEVID1,
        mr_new[74] = mr_old[50] # DBGDEVID,
        mr_new[77] = mr_old[51] # TEEHBR,
        mr_new[109] = mr_old[52] # v7 SCTLR -> aarc32 SCTLR_NS
        mr_new[189] = mr_old[53] # DCCISW,
        mr_new[188] = mr_old[54] # DCCIMVAC,
        mr_new[183] = mr_old[55] # DCCMVAC,
        mr_new[271] = mr_old[56] # v7 CONTEXTIDR -> aarch32 CONTEXTIDR_NS,
        mr_new[274] = mr_old[57] # v7 TPIDRURW -> aarch32 TPIDRURW_NS,
        mr_new[277] = mr_old[58] # v7 TPIDRURO -> aarch32 TPIDRURO_NS,
        mr_new[280] = mr_old[59] # v7 TPIDRPRW -> aarch32 TPIDRPRW_NS,
        mr_new[170] = mr_old[60] # CP15ISB,
        mr_new[185] = mr_old[61] # CP15DSB,
        mr_new[186] = mr_old[62] # CP15DMB,
        mr_new[114] = mr_old[63] # CPACR,
        mr_new[101] = mr_old[64] # CLIDR,
        mr_new[100] = mr_old[65] # CCSIDR,
        mr_new[104] = mr_old[66] # v7 CSSELR -> aarch32 CSSELR_NS,
        mr_new[163] = mr_old[67] # ICIALLUIS,
        mr_new[168] = mr_old[68] # ICIALLU,
        mr_new[169] = mr_old[69] # ICIMVAU,
        mr_new[172] = mr_old[70] # BPIMVA,
        mr_new[164] = mr_old[71] # BPIALLIS,
        mr_new[171] = mr_old[72] # BPIALL,
        mr_new[80] = mr_old[73] # MIDR,
        mr_new[126] = mr_old[74] # v7 TTBR0 -> aarch32 TTBR0_NS,
        mr_new[129] = mr_old[75] # v7 TTBR1 -> aarch32 TTBR1_NS,
        mr_new[83] = mr_old[76] # TLBTR,
        mr_new[137] = mr_old[77] # v7 DACR -> aarch32 DACR_NS,
        mr_new[192] = mr_old[78] # TLBIALLIS,
        mr_new[193] = mr_old[79] # TLBIMVAIS,
        mr_new[194] = mr_old[80] # TLBIASIDIS,
        mr_new[195] = mr_old[81] # TLBIMVAAIS,
        mr_new[198] = mr_old[82] # ITLBIALL,
        mr_new[199] = mr_old[83] # ITLBIMVA,
        mr_new[200] = mr_old[84] # ITLBIASID,
        mr_new[201] = mr_old[85] # DTLBIALL,
        mr_new[202] = mr_old[86] # DTLBIMVA,
        mr_new[203] = mr_old[87] # DTLBIASID,
        mr_new[204] = mr_old[88] # TLBIALL,
        mr_new[205] = mr_old[89] # TLBIMVA,
        mr_new[206] = mr_old[90] # TLBIASID,
        mr_new[207] = mr_old[91] # TLBIMVAA,
        mr_new[140] = mr_old[92] # v7 DFSR -> aarch32 DFSR_NS,
        mr_new[143] = mr_old[93] # v7 IFSR -> aarch32 IFSR_NS,
        mr_new[155] = mr_old[94] # v7 DFAR -> aarch32 DFAR_NS,
        mr_new[158] = mr_old[95] # v7 IFAR -> aarch32 IFAR_NS,
        mr_new[84] = mr_old[96] # MPIDR,
        mr_new[241] = mr_old[97] # v7 PRRR -> aarch32 PRRR_NS,
        mr_new[247] = mr_old[98] # v7 NMRR -> aarch32 NMRR_NS,
        mr_new[131] = mr_old[99] # TTBCR,
        mr_new[86] = mr_old[100] # ID_PFR0,
        mr_new[81] = mr_old[101] # CTR,
        mr_new[115] = mr_old[102] # SCR,
        # Set the non-secure bit
        scr = int(mr_new[115])
        scr = scr | 0x1
        mr_new[115] = str(scr)
        ###
        mr_new[116] = mr_old[103] # SDER,
        mr_new[165] = mr_old[104] # PAR,
        mr_new[175] = mr_old[105] # V2PCWPR -> ATS1CPR,
        mr_new[176] = mr_old[106] # V2PCWPW -> ATS1CPW,
        mr_new[177] = mr_old[107] # V2PCWUR -> ATS1CUR,
        mr_new[178] = mr_old[108] # V2PCWUW -> ATS1CUW,
        mr_new[179] = mr_old[109] # V2POWPR -> ATS12NSOPR,
        mr_new[180] = mr_old[110] # V2POWPW -> ATS12NSOPW,
        mr_new[181] = mr_old[111] # V2POWUR -> ATS12NSOUR,
        mr_new[182] = mr_old[112] # V2POWUW -> ATS12NWOUW,
        mr_new[90] = mr_old[113] # ID_MMFR0,
        mr_new[92] = mr_old[114] # ID_MMFR2,
        mr_new[93] = mr_old[115] # ID_MMFR3,
        mr_new[112] = mr_old[116] # v7 ACTLR -> aarch32 ACTLR_NS
        mr_new[222] = mr_old[117] # PMCR,
        mr_new[230] = mr_old[118] # PMCCNTR,
        mr_new[223] = mr_old[119] # PMCNTENSET,
        mr_new[224] = mr_old[120] # PMCNTENCLR,
        mr_new[225] = mr_old[121] # PMOVSR,
        mr_new[226] = mr_old[122] # PMSWINC,
        mr_new[227] = mr_old[123] # PMSELR,
        mr_new[228] = mr_old[124] # PMCEID0,
        mr_new[229] = mr_old[125] # PMCEID1,
        mr_new[231] = mr_old[126] # PMXEVTYPER,
        mr_new[233] = mr_old[127] # PMXEVCNTR,
        mr_new[234] = mr_old[128] # PMUSERENR,
        mr_new[235] = mr_old[129] # PMINTENSET,
        mr_new[236] = mr_old[130] # PMINTENCLR,
        mr_new[94] = mr_old[131] # ID_ISAR0,
        mr_new[95] = mr_old[132] # ID_ISAR1,
        mr_new[96] = mr_old[133] # ID_ISAR2,
        mr_new[97] = mr_old[134] # ID_ISAR3,
        mr_new[98] = mr_old[135] # ID_ISAR4,
        mr_new[99] = mr_old[136] # ID_ISAR5,
        mr_new[20] = mr_old[137] # LOCKFLAG,
        mr_new[19] = mr_old[138] # LOCKADDR,
        mr_new[87] = mr_old[139] # ID_PFR1,
        # Set up the processor features register
        pfr = int(mr_new[87])
        pfr = pfr | 0x1011
        mr_new[87] = str(pfr)
        ###
        mr_new[238] = mr_old[140] # L2CTLR,
        mr_new[82] = mr_old[141] # TCMTR
        mr_new[88] = mr_old[142] # ID_DFR0,
        mr_new[89] = mr_old[143] # ID_AFR0,
        mr_new[91] = mr_old[144] # ID_MMFR1,
        mr_new[102] = mr_old[145] # AIDR,
        mr_new[146] = mr_old[146] # v7 ADFSR -> aarch32 ADFSR_NS,
        mr_new[148] = mr_old[147] # AIFSR,
        mr_new[173] = mr_old[148] # DCIMVAC,
        mr_new[174] = mr_old[149] # DCISW,
        mr_new[184] = mr_old[150] # MCCSW -> DCCSW,
        mr_new[187] = mr_old[151] # DCCMVAU,
        mr_new[117] = mr_old[152] # NSACR,
        mr_new[262] = mr_old[153] # VBAR,
        mr_new[265] = mr_old[154] # MVBAR,
        mr_new[267] = mr_old[155] # ISR,
        mr_new[269] = mr_old[156] # FCEIDR -> FCSEIDR,
        #mr_new[] = mr_old[157] # L2LATENCY -> UNUSED,
        #mr_new[] = mr_old[158] # CRN15 -> UNUSED,
        mr_new[599] = mr_old[159] # NOP
        mr_new[600] = mr_old[160] # RAZ,

        # Set the new miscRegs structure
        cpt.set(sec, 'miscRegs', ' '.join(str(x) for x in mr_new))

    cpu_prefix = {}
    # Add in state for ITB/DTB
    for sec in cpt.sections():
        re_tlb_match = re.match('(^.*?sys.*?\.cpu(\d+)*)\.(dtb|itb)$', sec)
        if not re_tlb_match:
            continue

        cpu_prefix[re_tlb_match.group(1)] = True # Save off prefix to add
        # Set the non-secure bit (bit 9) to 1 for attributes
        attr = int(cpt.get(sec, '_attr'))
        attr = attr | 0x200
        cpt.set(sec, '_attr', str(attr))
        cpt.set(sec, 'haveLPAE', 'false')
        cpt.set(sec, 'directToStage2', 'false')
        cpt.set(sec, 'stage2Req', 'false')
        cpt.set(sec, 'bootUncacheability', 'true')

    # Add in extra state for the new TLB Entries
    for sec in cpt.sections():
        re_tlbentry_match = re.match('(^.*?sys.*?\.cpu(\d+)*)\.(dtb|itb).TlbEntry\d+$', sec)
        if not re_tlbentry_match:
            continue

        # Add in the new entries
        cpt.set(sec, 'longDescFormat', 'false')
        cpt.set(sec, 'vmid', '0')
        cpt.set(sec, 'isHyp', 'false')
        valid = cpt.get(sec, 'valid')
        if valid == 'true':
            cpt.set(sec, 'ns', 'true')
            cpt.set(sec, 'nstid', 'true')
            cpt.set(sec, 'pxn', 'true')
            cpt.set(sec, 'hap', '3')
            # All v7 code used 2 level page tables
            cpt.set(sec, 'lookupLevel', '2')
            attr = int(cpt.get(sec, 'attributes'))
            # set the non-secure bit (bit 9) to 1
            # as no previous v7 code used secure code
            attr = attr | 0x200
            cpt.set(sec, 'attributes', str(attr))
        else:
            cpt.set(sec, 'ns', 'false')
            cpt.set(sec, 'nstid', 'false')
            cpt.set(sec, 'pxn', 'false')
            cpt.set(sec, 'hap', '0')
            cpt.set(sec, 'lookupLevel', '0')
        cpt.set(sec, 'outerShareable', 'false')

    # Add d/istage2_mmu and d/istage2_mmu.stage2_tlb
    for key in cpu_prefix:
        for suffix in ['.istage2_mmu', '.dstage2_mmu']:
            new_sec = key + suffix
            cpt.add_section(new_sec)
            new_sec = key + suffix + ".stage2_tlb"
            cpt.add_section(new_sec)
            # Fill in tlb info with some defaults
            cpt.set(new_sec, '_attr', '0')
            cpt.set(new_sec, 'haveLPAE', 'false')
            cpt.set(new_sec, 'directToStage2', 'false')
            cpt.set(new_sec, 'stage2Req', 'false')
            cpt.set(new_sec, 'bootUncacheability', 'false')
            cpt.set(new_sec, 'num_entries', '0')

# Version 10 adds block_size_bytes to system.ruby
def from_9(cpt):
    for sec in cpt.sections():
        if sec == 'system.ruby':
            # Use Gem5's default of 64; this should be changed if the to be
            # upgraded checkpoints were not taken with block-size 64!
            cpt.set(sec, 'block_size_bytes', '64')

# Checkpoint version 11 (0xB) adds the perfLevel variable in the clock domain
# and voltage domain simObjects used for DVFS and is serialized and
# unserialized.
def from_A(cpt):
    for sec in cpt.sections():
        import re

        if re.match('^.*sys.*[._]clk_domain$', sec):
            # Make _perfLevel equal to 0 which means best performance
            cpt.set(sec, '_perfLevel', ' '.join('0'))
        elif re.match('^.*sys.*[._]voltage_domain$', sec):
            # Make _perfLevel equal to 0 which means best performance
            cpt.set(sec, '_perfLevel', ' '.join('0'))
        else:
            continue

# The change between versions C and D is the addition of support for multiple
# event queues, so for old checkpoints we must specify that there's only one.
def from_B(cpt):
    cpt.set('Globals', 'numMainEventQueues', '1')

# Checkpoint version D uses condition code registers for the ARM
# architecture; previously the integer register file was used for these
# registers. To upgrade, we move those 5 integer registers to the ccRegs
# register file.
def from_C(cpt):
    if cpt.get('root','isa') == 'arm':
        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

            items = []
            for (item,value) in cpt.items(sec):
                items.append(item)
            if 'ccRegs' not in items:
                intRegs = cpt.get(sec, 'intRegs').split()

                ccRegs = intRegs[38:43]
                del      intRegs[38:43]

                ccRegs.append('0') # CCREG_ZERO

                cpt.set(sec, 'intRegs', ' '.join(intRegs))
                cpt.set(sec, 'ccRegs',  ' '.join(ccRegs))

# Checkpoint version E adds the ARM CONTEXTIDR_EL2 miscreg.
def from_D(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):
                miscRegs = cpt.get(sec, 'miscRegs').split()
                # CONTEXTIDR_EL2 defaults to 0b11111100000000000001
                miscRegs[599:599] = [0xFC001]
                cpt.set(sec, 'miscRegs', ' '.join(str(x) for x in miscRegs))

# Checkpoint version F renames an internal member of Process class.
def from_E(cpt):
    import re
    for sec in cpt.sections():
        fdm = 'FdMap'
        fde = 'FDEntry'
        if re.match('.*\.%s.*' % fdm, sec):
            rename = re.sub(fdm, fde, sec)
            split = re.split(fde, rename)

            # rename the section and add the 'mode' field
            rename_section(cpt, sec, rename)
            cpt.set(rename, 'mode', "0") # no proper value to set :(

            # add in entries 257 to 1023
            if split[1] == "0":
                for x in range(257, 1024):
                    seq = (split[0], fde, "%s" % x)
                    section = "".join(seq)
                    cpt.add_section(section)
                    cpt.set(section, 'fd', '-1')


migrations = []
migrations.append(from_0)
migrations.append(from_1)
migrations.append(from_2)
migrations.append(from_3)
migrations.append(from_4)
migrations.append(from_5)
migrations.append(from_6)
migrations.append(from_7)
migrations.append(from_8)
migrations.append(from_9)
migrations.append(from_A)
migrations.append(from_B)
migrations.append(from_C)
migrations.append(from_D)
migrations.append(from_E)

# http://stackoverflow.com/questions/15069127/python-configparser-module-\
# rename-a-section
def rename_section(cp, section_from, section_to):
    items = cp.items(section_from)
    cp.add_section(section_to)
    for item in items:
        cp.set(section_to, item[0], item[1])
    cp.remove_section(section_from)

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)