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qemu-e2k/scripts/replay-dump.py
Alex Bennée 821c113033 scripts/replay-dump.py: replay log dumper 
This script is a debugging tool for looking through the contents of a
replay log file. It is incomplete but should fail gracefully at events
it doesn't understand.

It currently understands two different log formats as the audio
record/replay support was merged during since MTTCG. It was written to
help debug what has caused the BQL changes to break replay support.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20180227095310.1060.14500.stgit@pasha-VirtualBox>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12 17:10:38 +01:00

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Dump the contents of a recorded execution stream
#
# Copyright (c) 2017 Alex Bennée <alex.bennee@linaro.org>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <http://www.gnu.org/licenses/>.
import argparse
import struct
from collections import namedtuple
# This mirrors some of the global replay state which some of the
# stream loading refers to. Some decoders may read the next event so
# we need handle that case. Calling reuse_event will ensure the next
# event is read from the cache rather than advancing the file.
class ReplayState(object):
def __init__(self):
self.event = -1
self.event_count = 0
self.already_read = False
self.current_checkpoint = 0
self.checkpoint = 0
def set_event(self, ev):
self.event = ev
self.event_count += 1
def get_event(self):
self.already_read = False
return self.event
def reuse_event(self, ev):
self.event = ev
self.already_read = True
def set_checkpoint(self):
self.checkpoint = self.event - self.checkpoint_start
def get_checkpoint(self):
return self.checkpoint
replay_state = ReplayState()
# Simple read functions that mirror replay-internal.c
# The file-stream is big-endian and manually written out a byte at a time.
def read_byte(fin):
"Read a single byte"
return struct.unpack('>B', fin.read(1))[0]
def read_event(fin):
"Read a single byte event, but save some state"
if replay_state.already_read:
return replay_state.get_event()
else:
replay_state.set_event(read_byte(fin))
return replay_state.event
def read_word(fin):
"Read a 16 bit word"
return struct.unpack('>H', fin.read(2))[0]
def read_dword(fin):
"Read a 32 bit word"
return struct.unpack('>I', fin.read(4))[0]
def read_qword(fin):
"Read a 64 bit word"
return struct.unpack('>Q', fin.read(8))[0]
# Generic decoder structure
Decoder = namedtuple("Decoder", "eid name fn")
def call_decode(table, index, dumpfile):
"Search decode table for next step"
decoder = next((d for d in table if d.eid == index), None)
if not decoder:
print "Could not decode index: %d" % (index)
print "Entry is: %s" % (decoder)
print "Decode Table is:\n%s" % (table)
return False
else:
return decoder.fn(decoder.eid, decoder.name, dumpfile)
# Print event
def print_event(eid, name, string=None, event_count=None):
"Print event with count"
if not event_count:
event_count = replay_state.event_count
if string:
print "%d:%s(%d) %s" % (event_count, name, eid, string)
else:
print "%d:%s(%d)" % (event_count, name, eid)
# Decoders for each event type
def decode_unimp(eid, name, _unused_dumpfile):
"Unimplimented decoder, will trigger exit"
print "%s not handled - will now stop" % (name)
return False
# Checkpoint decoder
def swallow_async_qword(eid, name, dumpfile):
"Swallow a qword of data without looking at it"
step_id = read_qword(dumpfile)
print " %s(%d) @ %d" % (name, eid, step_id)
return True
async_decode_table = [ Decoder(0, "REPLAY_ASYNC_EVENT_BH", swallow_async_qword),
Decoder(1, "REPLAY_ASYNC_INPUT", decode_unimp),
Decoder(2, "REPLAY_ASYNC_INPUT_SYNC", decode_unimp),
Decoder(3, "REPLAY_ASYNC_CHAR_READ", decode_unimp),
Decoder(4, "REPLAY_ASYNC_EVENT_BLOCK", decode_unimp),
Decoder(5, "REPLAY_ASYNC_EVENT_NET", decode_unimp),
]
# See replay_read_events/replay_read_event
def decode_async(eid, name, dumpfile):
"""Decode an ASYNC event"""
print_event(eid, name)
async_event_kind = read_byte(dumpfile)
async_event_checkpoint = read_byte(dumpfile)
if async_event_checkpoint != replay_state.current_checkpoint:
print " mismatch between checkpoint %d and async data %d" % (
replay_state.current_checkpoint, async_event_checkpoint)
return True
return call_decode(async_decode_table, async_event_kind, dumpfile)
def decode_instruction(eid, name, dumpfile):
ins_diff = read_dword(dumpfile)
print_event(eid, name, "0x%x" % (ins_diff))
return True
def decode_audio_out(eid, name, dumpfile):
audio_data = read_dword(dumpfile)
print_event(eid, name, "%d" % (audio_data))
return True
def decode_checkpoint(eid, name, dumpfile):
"""Decode a checkpoint.
Checkpoints contain a series of async events with their own specific data.
"""
replay_state.set_checkpoint()
# save event count as we peek ahead
event_number = replay_state.event_count
next_event = read_event(dumpfile)
# if the next event is EVENT_ASYNC there are a bunch of
# async events to read, otherwise we are done
if next_event != 3:
print_event(eid, name, "no additional data", event_number)
else:
print_event(eid, name, "more data follows", event_number)
replay_state.reuse_event(next_event)
return True
def decode_checkpoint_init(eid, name, dumpfile):
print_event(eid, name)
return True
def decode_interrupt(eid, name, dumpfile):
print_event(eid, name)
return True
def decode_clock(eid, name, dumpfile):
clock_data = read_qword(dumpfile)
print_event(eid, name, "0x%x" % (clock_data))
return True
# pre-MTTCG merge
v5_event_table = [Decoder(0, "EVENT_INSTRUCTION", decode_instruction),
Decoder(1, "EVENT_INTERRUPT", decode_interrupt),
Decoder(2, "EVENT_EXCEPTION", decode_unimp),
Decoder(3, "EVENT_ASYNC", decode_async),
Decoder(4, "EVENT_SHUTDOWN", decode_unimp),
Decoder(5, "EVENT_CHAR_WRITE", decode_unimp),
Decoder(6, "EVENT_CHAR_READ_ALL", decode_unimp),
Decoder(7, "EVENT_CHAR_READ_ALL_ERROR", decode_unimp),
Decoder(8, "EVENT_CLOCK_HOST", decode_clock),
Decoder(9, "EVENT_CLOCK_VIRTUAL_RT", decode_clock),
Decoder(10, "EVENT_CP_CLOCK_WARP_START", decode_checkpoint),
Decoder(11, "EVENT_CP_CLOCK_WARP_ACCOUNT", decode_checkpoint),
Decoder(12, "EVENT_CP_RESET_REQUESTED", decode_checkpoint),
Decoder(13, "EVENT_CP_SUSPEND_REQUESTED", decode_checkpoint),
Decoder(14, "EVENT_CP_CLOCK_VIRTUAL", decode_checkpoint),
Decoder(15, "EVENT_CP_CLOCK_HOST", decode_checkpoint),
Decoder(16, "EVENT_CP_CLOCK_VIRTUAL_RT", decode_checkpoint),
Decoder(17, "EVENT_CP_INIT", decode_checkpoint_init),
Decoder(18, "EVENT_CP_RESET", decode_checkpoint),
]
# post-MTTCG merge, AUDIO support added
v6_event_table = [Decoder(0, "EVENT_INSTRUCTION", decode_instruction),
Decoder(1, "EVENT_INTERRUPT", decode_interrupt),
Decoder(2, "EVENT_EXCEPTION", decode_unimp),
Decoder(3, "EVENT_ASYNC", decode_async),
Decoder(4, "EVENT_SHUTDOWN", decode_unimp),
Decoder(5, "EVENT_CHAR_WRITE", decode_unimp),
Decoder(6, "EVENT_CHAR_READ_ALL", decode_unimp),
Decoder(7, "EVENT_CHAR_READ_ALL_ERROR", decode_unimp),
Decoder(8, "EVENT_AUDIO_OUT", decode_audio_out),
Decoder(9, "EVENT_AUDIO_IN", decode_unimp),
Decoder(10, "EVENT_CLOCK_HOST", decode_clock),
Decoder(11, "EVENT_CLOCK_VIRTUAL_RT", decode_clock),
Decoder(12, "EVENT_CP_CLOCK_WARP_START", decode_checkpoint),
Decoder(13, "EVENT_CP_CLOCK_WARP_ACCOUNT", decode_checkpoint),
Decoder(14, "EVENT_CP_RESET_REQUESTED", decode_checkpoint),
Decoder(15, "EVENT_CP_SUSPEND_REQUESTED", decode_checkpoint),
Decoder(16, "EVENT_CP_CLOCK_VIRTUAL", decode_checkpoint),
Decoder(17, "EVENT_CP_CLOCK_HOST", decode_checkpoint),
Decoder(18, "EVENT_CP_CLOCK_VIRTUAL_RT", decode_checkpoint),
Decoder(19, "EVENT_CP_INIT", decode_checkpoint_init),
Decoder(20, "EVENT_CP_RESET", decode_checkpoint),
]
# Shutdown cause added
v7_event_table = [Decoder(0, "EVENT_INSTRUCTION", decode_instruction),
Decoder(1, "EVENT_INTERRUPT", decode_interrupt),
Decoder(2, "EVENT_EXCEPTION", decode_unimp),
Decoder(3, "EVENT_ASYNC", decode_async),
Decoder(4, "EVENT_SHUTDOWN", decode_unimp),
Decoder(5, "EVENT_SHUTDOWN_HOST_ERR", decode_unimp),
Decoder(6, "EVENT_SHUTDOWN_HOST_QMP", decode_unimp),
Decoder(7, "EVENT_SHUTDOWN_HOST_SIGNAL", decode_unimp),
Decoder(8, "EVENT_SHUTDOWN_HOST_UI", decode_unimp),
Decoder(9, "EVENT_SHUTDOWN_GUEST_SHUTDOWN", decode_unimp),
Decoder(10, "EVENT_SHUTDOWN_GUEST_RESET", decode_unimp),
Decoder(11, "EVENT_SHUTDOWN_GUEST_PANIC", decode_unimp),
Decoder(12, "EVENT_SHUTDOWN___MAX", decode_unimp),
Decoder(13, "EVENT_CHAR_WRITE", decode_unimp),
Decoder(14, "EVENT_CHAR_READ_ALL", decode_unimp),
Decoder(15, "EVENT_CHAR_READ_ALL_ERROR", decode_unimp),
Decoder(16, "EVENT_AUDIO_OUT", decode_audio_out),
Decoder(17, "EVENT_AUDIO_IN", decode_unimp),
Decoder(18, "EVENT_CLOCK_HOST", decode_clock),
Decoder(19, "EVENT_CLOCK_VIRTUAL_RT", decode_clock),
Decoder(20, "EVENT_CP_CLOCK_WARP_START", decode_checkpoint),
Decoder(21, "EVENT_CP_CLOCK_WARP_ACCOUNT", decode_checkpoint),
Decoder(22, "EVENT_CP_RESET_REQUESTED", decode_checkpoint),
Decoder(23, "EVENT_CP_SUSPEND_REQUESTED", decode_checkpoint),
Decoder(24, "EVENT_CP_CLOCK_VIRTUAL", decode_checkpoint),
Decoder(25, "EVENT_CP_CLOCK_HOST", decode_checkpoint),
Decoder(26, "EVENT_CP_CLOCK_VIRTUAL_RT", decode_checkpoint),
Decoder(27, "EVENT_CP_INIT", decode_checkpoint_init),
Decoder(28, "EVENT_CP_RESET", decode_checkpoint),
]
def parse_arguments():
"Grab arguments for script"
parser = argparse.ArgumentParser()
parser.add_argument("-f", "--file", help='record/replay dump to read from',
required=True)
return parser.parse_args()
def decode_file(filename):
"Decode a record/replay dump"
dumpfile = open(filename, "rb")
# read and throwaway the header
version = read_dword(dumpfile)
junk = read_qword(dumpfile)
print "HEADER: version 0x%x" % (version)
if version == 0xe02007:
event_decode_table = v7_event_table
replay_state.checkpoint_start = 12
elif version == 0xe02006:
event_decode_table = v6_event_table
replay_state.checkpoint_start = 12
else:
event_decode_table = v5_event_table
replay_state.checkpoint_start = 10
try:
decode_ok = True
while decode_ok:
event = read_event(dumpfile)
decode_ok = call_decode(event_decode_table, event, dumpfile)
finally:
dumpfile.close()
if __name__ == "__main__":
args = parse_arguments()
decode_file(args.file)
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