xref: /openbmc/qemu/scripts/qemugdb/mtree.py (revision 1f7685fa) 
1#!/usr/bin/python
2
3# GDB debugging support
4#
5# Copyright 2012 Red Hat, Inc. and/or its affiliates
6#
7# Authors:
8#  Avi Kivity <avi@redhat.com>
9#
10# This work is licensed under the terms of the GNU GPL, version 2.  See
11# the COPYING file in the top-level directory.
12#
13# Contributions after 2012-01-13 are licensed under the terms of the
14# GNU GPL, version 2 or (at your option) any later version.
15
16# 'qemu mtree' -- display the memory hierarchy
17
18import gdb
19
20def isnull(ptr):
21    return ptr == gdb.Value(0).cast(ptr.type)
22
23def int128(p):
24    return int(p['lo']) + (int(p['hi']) << 64)
25
26class MtreeCommand(gdb.Command):
27    '''Display the memory tree hierarchy'''
28    def __init__(self):
29        gdb.Command.__init__(self, 'qemu mtree', gdb.COMMAND_DATA,
30                             gdb.COMPLETE_NONE)
31        self.queue = []
32    def invoke(self, arg, from_tty):
33        self.seen = set()
34        self.queue_root('address_space_memory')
35        self.queue_root('address_space_io')
36        self.process_queue()
37    def queue_root(self, varname):
38        ptr = gdb.parse_and_eval(varname)['root']
39        self.queue.append(ptr)
40    def process_queue(self):
41        while self.queue:
42            ptr = self.queue.pop(0)
43            if int(ptr) in self.seen:
44                continue
45            self.print_item(ptr)
46    def print_item(self, ptr, offset = gdb.Value(0), level = 0):
47        self.seen.add(int(ptr))
48        addr = ptr['addr']
49        addr += offset
50        size = int128(ptr['size'])
51        alias = ptr['alias']
52        klass = ''
53        if not isnull(alias):
54            klass = ' (alias)'
55        elif not isnull(ptr['ops']):
56            klass = ' (I/O)'
57        elif bool(ptr['ram']):
58            klass = ' (RAM)'
59        gdb.write('%s%016x-%016x %s%s (@ %s)\n'
60                  % ('  ' * level,
61                     int(addr),
62                     int(addr + (size - 1)),
63                     ptr['name'].string(),
64                     klass,
65                     ptr,
66                     ),
67                  gdb.STDOUT)
68        if not isnull(alias):
69            gdb.write('%s    alias: %s@%016x (@ %s)\n' %
70                      ('  ' * level,
71                       alias['name'].string(),
72                       ptr['alias_offset'],
73                       alias,
74                       ),
75                      gdb.STDOUT)
76            self.queue.append(alias)
77        subregion = ptr['subregions']['tqh_first']
78        level += 1
79        while not isnull(subregion):
80            self.print_item(subregion, addr, level)
81            subregion = subregion['subregions_link']['tqe_next']
82
83