decode_packet_trace.py

#!/usr/bin/env python3

# Copyright (c) 2013-2014 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,
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# This script is used to dump protobuf packet traces to ASCII
# format.

import os
import protolib
import subprocess
import sys

util_dir = os.path.dirname(os.path.realpath(__file__))
# Make sure the proto definitions are up to date.
subprocess.check_call(["make", "--quiet", "-C", util_dir, "packet_pb2.py"])
import packet_pb2


def main():
    if len(sys.argv) != 3:
        print("Usage: ", sys.argv[0], " <protobuf input> <ASCII output>")
        exit(-1)

    # Open the file in read mode
    proto_in = protolib.openFileRd(sys.argv[1])

    try:
        ascii_out = open(sys.argv[2], "w")
    except OSError:
        print("Failed to open ", sys.argv[2], " for writing")
        exit(-1)

    # Read the magic number in 4-byte Little Endian
    magic_number = proto_in.read(4).decode()

    if magic_number != "gem5":
        print("Unrecognized file", sys.argv[1])
        exit(-1)

    print("Parsing packet header")

    # Add the packet header
    header = packet_pb2.PacketHeader()
    protolib.decodeMessage(proto_in, header)

    print("Object id:", header.obj_id)
    print("Tick frequency:", header.tick_freq)

    for id_string in header.id_strings:
        print("Master id %d: %s" % (id_string.key, id_string.value))

    print("Parsing packets")

    num_packets = 0
    packet = packet_pb2.Packet()

    # Decode the packet messages until we hit the end of the file
    while protolib.decodeMessage(proto_in, packet):
        num_packets += 1
        # ReadReq is 1 and WriteReq is 4 in src/mem/packet.hh Command enum
        cmd = "r" if packet.cmd == 1 else ("w" if packet.cmd == 4 else "u")
        if packet.HasField("pkt_id"):
            ascii_out.write(f"{packet.pkt_id},")
        if packet.HasField("flags"):
            ascii_out.write(
                f"{cmd},{packet.addr},{packet.size},{packet.flags},{packet.tick}"
            )
        else:
            ascii_out.write(f"{cmd},{packet.addr},{packet.size},{packet.tick}")
        if packet.HasField("pc"):
            ascii_out.write(f",{packet.pc}\n")
        else:
            ascii_out.write("\n")

    print("Parsed packets:", num_packets)

    # We're done
    ascii_out.close()
    proto_in.close()


if __name__ == "__main__":
    main()