scripts/qemugdb/mtree.py

   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
  18 import gdb
  19
  20 def isnull(ptr):
  21     return ptr == gdb.Value(0).cast(ptr.type)
  22
  23 def int128(p):
  24     return int(p['lo']) + (int(p['hi']) << 64)
  25
  26 class 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