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#!/usr/bin/python
# GDB debugging support: aio/iohandler debug
#
# Copyright (c) 2015 Red Hat, Inc.
#
# Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or
# later. See the COPYING file in the top-level directory.
#
import gdb
from qemugdb import coroutine
def isnull(ptr):
return ptr == gdb.Value(0).cast(ptr.type)
def dump_aiocontext(context, verbose):
'''Display a dump and backtrace for an aiocontext'''
cur = context['aio_handlers']['lh_first']
# Get pointers to functions we're going to process specially
sym_fd_coroutine_enter = gdb.parse_and_eval('fd_coroutine_enter')
while not isnull(cur):
entry = cur.dereference()
gdb.write('----\n%s\n' % entry)
if verbose and cur['io_read'] == sym_fd_coroutine_enter:
coptr = (cur['opaque'].cast(gdb.lookup_type('FDYieldUntilData').pointer()))['co']
coptr = coptr.cast(gdb.lookup_type('CoroutineUContext').pointer())
coroutine.bt_jmpbuf(coptr['env']['__jmpbuf'])
cur = cur['node']['le_next'];
gdb.write('----\n')
class HandlersCommand(gdb.Command):
'''Display aio handlers'''
def __init__(self):
gdb.Command.__init__(self, 'qemu handlers', gdb.COMMAND_DATA,
gdb.COMPLETE_NONE)
def invoke(self, arg, from_tty):
verbose = False
argv = gdb.string_to_argv(arg)
if len(argv) > 0 and argv[0] == '--verbose':
verbose = True
argv.pop(0)
if len(argv) > 1:
gdb.write('usage: qemu handlers [--verbose] [handler]\n')
return
if len(argv) == 1:
handlers_name = argv[0]
else:
handlers_name = 'qemu_aio_context'
dump_aiocontext(gdb.parse_and_eval(handlers_name), verbose)
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