decode_inst_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,
# 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.

# This script is used to dump protobuf instruction traces to ASCII
# format. It assumes that protoc has been executed and already
# generated the Python package for the inst messages. This can
# be done manually using:
# protoc --python_out=. inst.proto
# The ASCII trace format uses one line per request.

import protolib
import sys

# Import the packet proto definitions
try:
    import inst_pb2
except:
    print("Did not find protobuf inst definitions, attempting to generate")
    from subprocess import call

    error = call(
        [
            "protoc",
            "--python_out=util",
            "--proto_path=src/proto",
            "src/proto/inst.proto",
        ]
    )
    if not error:
        print("Generated inst proto definitions")

        try:
            import google.protobuf
        except:
            print("Please install Python protobuf module")
            exit(-1)

        import inst_pb2
    else:
        print("Failed to import inst proto definitions")
        exit(-1)


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)

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

    print("Parsing instruction header")

    # Add the packet header
    header = inst_pb2.InstHeader()
    protolib.decodeMessage(proto_in, header)

    print("Object id:", header.obj_id)
    print("Tick frequency:", header.tick_freq)
    print("Memory addresses included:", header.has_mem)

    if header.ver != 0:
        print("Warning: file version newer than decoder:", header.ver)
        print("This decoder may not understand how to decode this file")

    print("Parsing instructions")

    num_insts = 0
    inst = inst_pb2.Inst()

    # Decode the inst messages until we hit the end of the file
    optional_fields = (
        "tick",
        "type",
        "inst_flags",
        "addr",
        "size",
        "mem_flags",
    )
    while protolib.decodeMessage(proto_in, inst):
        # If we have a tick use it, otherwise count instructions
        if inst.HasField("tick"):
            tick = inst.tick
        else:
            tick = num_insts

        if inst.HasField("nodeid"):
            node_id = inst.nodeid
        else:
            node_id = 0
        if inst.HasField("cpuid"):
            cpu_id = inst.cpuid
        else:
            cpu_id = 0

        ascii_out.write(
            "%-20d: (%03d/%03d) %#010x @ %#016x "
            % (tick, node_id, cpu_id, inst.inst, inst.pc)
        )

        if inst.HasField("type"):
            ascii_out.write(
                " : %10s"
                % inst_pb2._INST_INSTTYPE.values_by_number[inst.type].name
            )

        for mem_acc in inst.mem_access:
            ascii_out.write(
                " {:#x}-{:#x};".format(
                    mem_acc.addr, mem_acc.addr + mem_acc.size
                )
            )

        ascii_out.write("\n")
        num_insts += 1

    print("Parsed instructions:", num_insts)

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


if __name__ == "__main__":
    main()