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#
# 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 or
# later. See the COPYING file in the top-level directory.
# 'qemu mtree' -- display the memory hierarchy
import gdb
def isnull(ptr):
return ptr == gdb.Value(0).cast(ptr.type)
def int128(p):
'''Read an Int128 type to a python integer.
QEMU can be built with native Int128 support so we need to detect
if the value is a structure or the native type.
'''
if p.type.code == gdb.TYPE_CODE_STRUCT:
return int(p['lo']) + (int(p['hi']) << 64)
else:
return int(("%s" % p), 16)
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 int(ptr) in self.seen:
continue
self.print_item(ptr)
def print_item(self, ptr, offset = gdb.Value(0), level = 0):
self.seen.add(int(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,
int(addr),
int(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(),
int(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']
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