2015-02-18 05:46:38 +08:00
|
|
|
#
|
|
|
|
# gdb helper commands and functions for Linux kernel debugging
|
|
|
|
#
|
|
|
|
# common utilities
|
|
|
|
#
|
|
|
|
# Copyright (c) Siemens AG, 2011-2013
|
|
|
|
#
|
|
|
|
# Authors:
|
|
|
|
# Jan Kiszka <jan.kiszka@siemens.com>
|
|
|
|
#
|
|
|
|
# This work is licensed under the terms of the GNU GPL version 2.
|
|
|
|
#
|
|
|
|
|
|
|
|
import gdb
|
|
|
|
|
|
|
|
|
|
|
|
class CachedType:
|
|
|
|
def __init__(self, name):
|
|
|
|
self._type = None
|
|
|
|
self._name = name
|
|
|
|
|
|
|
|
def _new_objfile_handler(self, event):
|
|
|
|
self._type = None
|
|
|
|
gdb.events.new_objfile.disconnect(self._new_objfile_handler)
|
|
|
|
|
|
|
|
def get_type(self):
|
|
|
|
if self._type is None:
|
|
|
|
self._type = gdb.lookup_type(self._name)
|
|
|
|
if self._type is None:
|
|
|
|
raise gdb.GdbError(
|
|
|
|
"cannot resolve type '{0}'".format(self._name))
|
|
|
|
if hasattr(gdb, 'events') and hasattr(gdb.events, 'new_objfile'):
|
|
|
|
gdb.events.new_objfile.connect(self._new_objfile_handler)
|
|
|
|
return self._type
|
2015-02-18 05:46:41 +08:00
|
|
|
|
|
|
|
|
|
|
|
long_type = CachedType("long")
|
|
|
|
|
|
|
|
|
|
|
|
def get_long_type():
|
|
|
|
global long_type
|
|
|
|
return long_type.get_type()
|
|
|
|
|
|
|
|
|
|
|
|
def offset_of(typeobj, field):
|
|
|
|
element = gdb.Value(0).cast(typeobj)
|
|
|
|
return int(str(element[field].address).split()[0], 16)
|
|
|
|
|
|
|
|
|
|
|
|
def container_of(ptr, typeobj, member):
|
|
|
|
return (ptr.cast(get_long_type()) -
|
|
|
|
offset_of(typeobj, member)).cast(typeobj)
|
|
|
|
|
|
|
|
|
|
|
|
class ContainerOf(gdb.Function):
|
|
|
|
"""Return pointer to containing data structure.
|
|
|
|
|
|
|
|
$container_of(PTR, "TYPE", "ELEMENT"): Given PTR, return a pointer to the
|
|
|
|
data structure of the type TYPE in which PTR is the address of ELEMENT.
|
|
|
|
Note that TYPE and ELEMENT have to be quoted as strings."""
|
|
|
|
|
|
|
|
def __init__(self):
|
|
|
|
super(ContainerOf, self).__init__("container_of")
|
|
|
|
|
|
|
|
def invoke(self, ptr, typename, elementname):
|
|
|
|
return container_of(ptr, gdb.lookup_type(typename.string()).pointer(),
|
|
|
|
elementname.string())
|
|
|
|
|
|
|
|
ContainerOf()
|