Commit f1cd52d8 authored by Alex Bennée's avatar Alex Bennée Committed by Paolo Bonzini
Browse files

scripts/qemu-gdb: add simple tcg lock status helper 



Add a simple helper to dump lock state.

Signed-off-by: default avatarAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 809092f3

scripts/qemu-gdb.py

+2 −1
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ import os, sys 


sys.path.append(os.path.dirname(__file__))



from qemugdb import aio, mtree, coroutine

from qemugdb import aio, mtree, coroutine, tcg



class QemuCommand(gdb.Command):

    '''Prefix for QEMU debug support commands'''
@@ -38,6 +38,7 @@ QemuCommand() 
coroutine.CoroutineCommand()

mtree.MtreeCommand()

aio.HandlersCommand()

tcg.TCGLockStatusCommand()



coroutine.CoroutineSPFunction()

coroutine.CoroutinePCFunction()

scripts/qemugdb/tcg.py

0 → 100644
+46 −0
Original line number Diff line number Diff line 
#!/usr/bin/python

# -*- coding: utf-8 -*-

#

# GDB debugging support, TCG status

#

# Copyright 2016 Linaro Ltd

#

# Authors:

#  Alex Bennée <alex.bennee@linaro.org>

#

# This work is licensed under the terms of the GNU GPL, version 2.  See

# the COPYING file in the top-level directory.

#

# Contributions after 2012-01-13 are licensed under the terms of the

# GNU GPL, version 2 or (at your option) any later version.



# 'qemu tcg-lock-status' -- display the TCG lock status across threads



import gdb



class TCGLockStatusCommand(gdb.Command):

    '''Display TCG Execution Status'''

    def __init__(self):

        gdb.Command.__init__(self, 'qemu tcg-lock-status', gdb.COMMAND_DATA,

                             gdb.COMPLETE_NONE)



    def invoke(self, arg, from_tty):

        gdb.write("Thread, BQL (iothread_mutex), Replay, Blocked?\n")

        for thread in gdb.inferiors()[0].threads():

            thread.switch()



            iothread = gdb.parse_and_eval("iothread_locked")

            replay = gdb.parse_and_eval("replay_locked")



            frame = gdb.selected_frame()

            if frame.name() == "__lll_lock_wait":

                frame.older().select()

                mutex = gdb.parse_and_eval("mutex")

                owner = gdb.parse_and_eval("mutex->__data.__owner")

                blocked = ("__lll_lock_wait waiting on %s from %d" %

                           (mutex, owner))

            else:

                blocked = "not blocked"



            gdb.write("%d/%d, %s, %s, %s\n" % (thread.num, thread.ptid[1],

                                               iothread, replay, blocked))