#!/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)