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scripts/qemu-gdb: Split MtreeCommand into its own module 

As we add more commands to our Python gdb debugging support, it's
going to get unwieldy to have everything in a single file. Split
the implementation of the 'mtree' command from qemu-gdb.py into
its own module.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1439574392-4403-2-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2015-08-14 18:46:29 +01:00
parent ba9cef7b6e
commit 93b1b365dc
3 changed files with 118 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
scripts/qemu-gdb.py
View File

@ -16,11 +16,14 @@
import gdb
def isnull(ptr):
return ptr == gdb.Value(0).cast(ptr.type)
import os, sys
def int128(p):
return long(p['lo']) + (long(p['hi']) << 64)
# Annoyingly, gdb doesn't put the directory of scripts onto the
# module search path. Do it manually.
sys.path.append(os.path.dirname(__file__))
from qemugdb import mtree
def get_fs_base():
'''Fetch %fs base value using arch_prctl(ARCH_GET_FS)'''
@ -102,63 +105,6 @@ class CoroutineCommand(gdb.Command):
coroutine_pointer = gdb.parse_and_eval(argv[0]).cast(gdb.lookup_type('CoroutineUContext').pointer())
bt_jmpbuf(coroutine_pointer['env']['__jmpbuf'])
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()
CoroutineCommand()
MtreeCommand()
mtree.MtreeCommand()

28
scripts/qemugdb/__init__.py Normal file
View File

@ -0,0 +1,28 @@
#!/usr/bin/python
# GDB debugging support
#
# Copyright (c) 2015 Linaro Ltd
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see
# <http://www.gnu.org/licenses/gpl-2.0.html>
#
# We don't need to do anything in our init file currently.
"""
Support routines for debugging QEMU under GDB
"""
__license__ = "GPL version 2 or (at your option) any later version"

82
scripts/qemugdb/mtree.py Normal file
View File

@ -0,0 +1,82 @@
#!/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.
# 'qemu mtree' -- display the memory hierarchy
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 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']