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https://gitlab.com/qemu-project/qemu
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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>
This commit is contained in:
Alex Bennée
Paolo Bonzini
parent
66eb7825d0
commit
821c113033
1 changed files with 308 additions and 0 deletions
308
scripts/replay-dump.py
Executable file
308
scripts/replay-dump.py
Executable file
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Dump the contents of a recorded execution stream
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#
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# Copyright (c) 2017 Alex Bennée <alex.bennee@linaro.org>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, see <http://www.gnu.org/licenses/>.
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import argparse
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import struct
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from collections import namedtuple
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# This mirrors some of the global replay state which some of the
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# stream loading refers to. Some decoders may read the next event so
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# we need handle that case. Calling reuse_event will ensure the next
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# event is read from the cache rather than advancing the file.
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class ReplayState(object):
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def __init__(self):
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self.event = -1
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self.event_count = 0
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self.already_read = False
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self.current_checkpoint = 0
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self.checkpoint = 0
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def set_event(self, ev):
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self.event = ev
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self.event_count += 1
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def get_event(self):
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self.already_read = False
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return self.event
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def reuse_event(self, ev):
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self.event = ev
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self.already_read = True
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def set_checkpoint(self):
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self.checkpoint = self.event - self.checkpoint_start
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def get_checkpoint(self):
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return self.checkpoint
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replay_state = ReplayState()
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# Simple read functions that mirror replay-internal.c
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# The file-stream is big-endian and manually written out a byte at a time.
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def read_byte(fin):
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"Read a single byte"
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return struct.unpack('>B', fin.read(1))[0]
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def read_event(fin):
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"Read a single byte event, but save some state"
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if replay_state.already_read:
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return replay_state.get_event()
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else:
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replay_state.set_event(read_byte(fin))
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return replay_state.event
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def read_word(fin):
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"Read a 16 bit word"
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return struct.unpack('>H', fin.read(2))[0]
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def read_dword(fin):
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"Read a 32 bit word"
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return struct.unpack('>I', fin.read(4))[0]
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def read_qword(fin):
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"Read a 64 bit word"
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return struct.unpack('>Q', fin.read(8))[0]
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# Generic decoder structure
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Decoder = namedtuple("Decoder", "eid name fn")
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def call_decode(table, index, dumpfile):
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"Search decode table for next step"
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decoder = next((d for d in table if d.eid == index), None)
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if not decoder:
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print "Could not decode index: %d" % (index)
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print "Entry is: %s" % (decoder)
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print "Decode Table is:\n%s" % (table)
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return False
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else:
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return decoder.fn(decoder.eid, decoder.name, dumpfile)
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# Print event
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def print_event(eid, name, string=None, event_count=None):
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"Print event with count"
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if not event_count:
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event_count = replay_state.event_count
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if string:
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print "%d:%s(%d) %s" % (event_count, name, eid, string)
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else:
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print "%d:%s(%d)" % (event_count, name, eid)
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# Decoders for each event type
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def decode_unimp(eid, name, _unused_dumpfile):
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"Unimplimented decoder, will trigger exit"
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print "%s not handled - will now stop" % (name)
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return False
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# Checkpoint decoder
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def swallow_async_qword(eid, name, dumpfile):
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"Swallow a qword of data without looking at it"
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step_id = read_qword(dumpfile)
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print " %s(%d) @ %d" % (name, eid, step_id)
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return True
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async_decode_table = [ Decoder(0, "REPLAY_ASYNC_EVENT_BH", swallow_async_qword),
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Decoder(1, "REPLAY_ASYNC_INPUT", decode_unimp),
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Decoder(2, "REPLAY_ASYNC_INPUT_SYNC", decode_unimp),
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Decoder(3, "REPLAY_ASYNC_CHAR_READ", decode_unimp),
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Decoder(4, "REPLAY_ASYNC_EVENT_BLOCK", decode_unimp),
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Decoder(5, "REPLAY_ASYNC_EVENT_NET", decode_unimp),
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]
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# See replay_read_events/replay_read_event
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def decode_async(eid, name, dumpfile):
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"""Decode an ASYNC event"""
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print_event(eid, name)
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async_event_kind = read_byte(dumpfile)
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async_event_checkpoint = read_byte(dumpfile)
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if async_event_checkpoint != replay_state.current_checkpoint:
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print " mismatch between checkpoint %d and async data %d" % (
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replay_state.current_checkpoint, async_event_checkpoint)
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return True
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return call_decode(async_decode_table, async_event_kind, dumpfile)
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def decode_instruction(eid, name, dumpfile):
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ins_diff = read_dword(dumpfile)
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print_event(eid, name, "0x%x" % (ins_diff))
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return True
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def decode_audio_out(eid, name, dumpfile):
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audio_data = read_dword(dumpfile)
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print_event(eid, name, "%d" % (audio_data))
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return True
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def decode_checkpoint(eid, name, dumpfile):
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"""Decode a checkpoint.
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Checkpoints contain a series of async events with their own specific data.
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"""
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replay_state.set_checkpoint()
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# save event count as we peek ahead
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event_number = replay_state.event_count
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next_event = read_event(dumpfile)
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# if the next event is EVENT_ASYNC there are a bunch of
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# async events to read, otherwise we are done
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if next_event != 3:
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print_event(eid, name, "no additional data", event_number)
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else:
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print_event(eid, name, "more data follows", event_number)
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replay_state.reuse_event(next_event)
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return True
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def decode_checkpoint_init(eid, name, dumpfile):
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print_event(eid, name)
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return True
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def decode_interrupt(eid, name, dumpfile):
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print_event(eid, name)
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return True
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def decode_clock(eid, name, dumpfile):
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clock_data = read_qword(dumpfile)
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print_event(eid, name, "0x%x" % (clock_data))
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return True
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# pre-MTTCG merge
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v5_event_table = [Decoder(0, "EVENT_INSTRUCTION", decode_instruction),
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Decoder(1, "EVENT_INTERRUPT", decode_interrupt),
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Decoder(2, "EVENT_EXCEPTION", decode_unimp),
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Decoder(3, "EVENT_ASYNC", decode_async),
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Decoder(4, "EVENT_SHUTDOWN", decode_unimp),
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Decoder(5, "EVENT_CHAR_WRITE", decode_unimp),
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Decoder(6, "EVENT_CHAR_READ_ALL", decode_unimp),
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Decoder(7, "EVENT_CHAR_READ_ALL_ERROR", decode_unimp),
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Decoder(8, "EVENT_CLOCK_HOST", decode_clock),
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Decoder(9, "EVENT_CLOCK_VIRTUAL_RT", decode_clock),
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Decoder(10, "EVENT_CP_CLOCK_WARP_START", decode_checkpoint),
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Decoder(11, "EVENT_CP_CLOCK_WARP_ACCOUNT", decode_checkpoint),
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Decoder(12, "EVENT_CP_RESET_REQUESTED", decode_checkpoint),
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Decoder(13, "EVENT_CP_SUSPEND_REQUESTED", decode_checkpoint),
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Decoder(14, "EVENT_CP_CLOCK_VIRTUAL", decode_checkpoint),
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Decoder(15, "EVENT_CP_CLOCK_HOST", decode_checkpoint),
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Decoder(16, "EVENT_CP_CLOCK_VIRTUAL_RT", decode_checkpoint),
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Decoder(17, "EVENT_CP_INIT", decode_checkpoint_init),
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Decoder(18, "EVENT_CP_RESET", decode_checkpoint),
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]
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# post-MTTCG merge, AUDIO support added
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v6_event_table = [Decoder(0, "EVENT_INSTRUCTION", decode_instruction),
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Decoder(1, "EVENT_INTERRUPT", decode_interrupt),
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Decoder(2, "EVENT_EXCEPTION", decode_unimp),
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Decoder(3, "EVENT_ASYNC", decode_async),
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Decoder(4, "EVENT_SHUTDOWN", decode_unimp),
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Decoder(5, "EVENT_CHAR_WRITE", decode_unimp),
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Decoder(6, "EVENT_CHAR_READ_ALL", decode_unimp),
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Decoder(7, "EVENT_CHAR_READ_ALL_ERROR", decode_unimp),
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Decoder(8, "EVENT_AUDIO_OUT", decode_audio_out),
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Decoder(9, "EVENT_AUDIO_IN", decode_unimp),
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Decoder(10, "EVENT_CLOCK_HOST", decode_clock),
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Decoder(11, "EVENT_CLOCK_VIRTUAL_RT", decode_clock),
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Decoder(12, "EVENT_CP_CLOCK_WARP_START", decode_checkpoint),
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Decoder(13, "EVENT_CP_CLOCK_WARP_ACCOUNT", decode_checkpoint),
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Decoder(14, "EVENT_CP_RESET_REQUESTED", decode_checkpoint),
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Decoder(15, "EVENT_CP_SUSPEND_REQUESTED", decode_checkpoint),
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Decoder(16, "EVENT_CP_CLOCK_VIRTUAL", decode_checkpoint),
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Decoder(17, "EVENT_CP_CLOCK_HOST", decode_checkpoint),
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Decoder(18, "EVENT_CP_CLOCK_VIRTUAL_RT", decode_checkpoint),
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Decoder(19, "EVENT_CP_INIT", decode_checkpoint_init),
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Decoder(20, "EVENT_CP_RESET", decode_checkpoint),
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]
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# Shutdown cause added
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v7_event_table = [Decoder(0, "EVENT_INSTRUCTION", decode_instruction),
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Decoder(1, "EVENT_INTERRUPT", decode_interrupt),
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Decoder(2, "EVENT_EXCEPTION", decode_unimp),
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Decoder(3, "EVENT_ASYNC", decode_async),
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Decoder(4, "EVENT_SHUTDOWN", decode_unimp),
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Decoder(5, "EVENT_SHUTDOWN_HOST_ERR", decode_unimp),
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Decoder(6, "EVENT_SHUTDOWN_HOST_QMP", decode_unimp),
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Decoder(7, "EVENT_SHUTDOWN_HOST_SIGNAL", decode_unimp),
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Decoder(8, "EVENT_SHUTDOWN_HOST_UI", decode_unimp),
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Decoder(9, "EVENT_SHUTDOWN_GUEST_SHUTDOWN", decode_unimp),
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Decoder(10, "EVENT_SHUTDOWN_GUEST_RESET", decode_unimp),
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Decoder(11, "EVENT_SHUTDOWN_GUEST_PANIC", decode_unimp),
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Decoder(12, "EVENT_SHUTDOWN___MAX", decode_unimp),
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Decoder(13, "EVENT_CHAR_WRITE", decode_unimp),
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Decoder(14, "EVENT_CHAR_READ_ALL", decode_unimp),
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Decoder(15, "EVENT_CHAR_READ_ALL_ERROR", decode_unimp),
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Decoder(16, "EVENT_AUDIO_OUT", decode_audio_out),
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Decoder(17, "EVENT_AUDIO_IN", decode_unimp),
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Decoder(18, "EVENT_CLOCK_HOST", decode_clock),
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Decoder(19, "EVENT_CLOCK_VIRTUAL_RT", decode_clock),
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Decoder(20, "EVENT_CP_CLOCK_WARP_START", decode_checkpoint),
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Decoder(21, "EVENT_CP_CLOCK_WARP_ACCOUNT", decode_checkpoint),
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Decoder(22, "EVENT_CP_RESET_REQUESTED", decode_checkpoint),
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Decoder(23, "EVENT_CP_SUSPEND_REQUESTED", decode_checkpoint),
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Decoder(24, "EVENT_CP_CLOCK_VIRTUAL", decode_checkpoint),
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Decoder(25, "EVENT_CP_CLOCK_HOST", decode_checkpoint),
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Decoder(26, "EVENT_CP_CLOCK_VIRTUAL_RT", decode_checkpoint),
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Decoder(27, "EVENT_CP_INIT", decode_checkpoint_init),
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Decoder(28, "EVENT_CP_RESET", decode_checkpoint),
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]
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def parse_arguments():
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"Grab arguments for script"
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parser = argparse.ArgumentParser()
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parser.add_argument("-f", "--file", help='record/replay dump to read from',
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required=True)
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return parser.parse_args()
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def decode_file(filename):
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"Decode a record/replay dump"
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dumpfile = open(filename, "rb")
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# read and throwaway the header
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version = read_dword(dumpfile)
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junk = read_qword(dumpfile)
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print "HEADER: version 0x%x" % (version)
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if version == 0xe02007:
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event_decode_table = v7_event_table
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replay_state.checkpoint_start = 12
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elif version == 0xe02006:
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event_decode_table = v6_event_table
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replay_state.checkpoint_start = 12
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else:
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event_decode_table = v5_event_table
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replay_state.checkpoint_start = 10
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try:
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decode_ok = True
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while decode_ok:
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event = read_event(dumpfile)
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decode_ok = call_decode(event_decode_table, event, dumpfile)
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finally:
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dumpfile.close()
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if __name__ == "__main__":
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args = parse_arguments()
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decode_file(args.file)
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