#!/usr/bin/python
# GDB debugging support
#
# Copyright 2012 Red Hat, Inc. and/or its affiliates
#
# Authors:
# Avi Kivity <avi@redhat.com>
#
# 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.
import gdb
def isnull(ptr):
return ptr == gdb.Value(0).cast(ptr.type)
def int128(p):
return long(p['lo']) + (long(p['hi']) << 64)
class QemuCommand(gdb.Command):
'''Prefix for QEMU debug support commands'''
def __init__(self):
gdb.Command.__init__(self, 'qemu', gdb.COMMAND_DATA,
gdb.COMPLETE_NONE, True)
class MtreeCommand(gdb.Command):
'''Display the memory tree hierarchy'''
def __init__(self):
gdb.Command.__init__(self, 'qemu mtree', gdb.COMMAND_DATA,
gdb.COMPLETE_NONE)
self.queue = []
def invoke(self, arg, from_tty):
self.seen = set()
self.queue_root('address_space_memory')
self.queue_root('address_space_io')
self.process_queue()
def queue_root(self, varname):
ptr = gdb.parse_and_eval(varname)['root']
self.queue.append(ptr)
def process_queue(self):
while self.queue:
ptr = self.queue.pop(0)
if long(ptr) in self.seen:
continue
self.print_item(ptr)
def print_item(self, ptr, offset = gdb.Value(0), level = 0):
self.seen.add(long(ptr))
addr = ptr['addr']
addr += offset
size = int128(ptr['size'])
alias = ptr['alias']
klass = ''
if not isnull(alias):
klass = ' (alias)'
elif not isnull(ptr['ops']):
klass = ' (I/O)'
elif bool(ptr['ram']):
klass = ' (RAM)'
gdb.write('%s%016x-%016x %s%s (@ %s)\n'
% (' ' * level,
long(addr),
long(addr + (size - 1)),
ptr['name'].string(),
klass,
ptr,
),
gdb.STDOUT)
if not isnull(alias):
gdb.write('%s alias: %s@%016x (@ %s)\n' %
(' ' * level,
alias['name'].string(),
ptr['alias_offset'],
alias,
),
gdb.STDOUT)
self.queue.append(alias)
subregion = ptr['subregions']['tqh_first']
level += 1
while not isnull(subregion):
self.print_item(subregion, addr, level)
subregion = subregion['subregions_link']['tqe_next']
QemuCommand()
MtreeCommand()
