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#
# gdb helper commands and functions for Linux kernel debugging
#
# module tools
#
# Copyright (c) Siemens AG, 2013
#
# Authors:
# Jan Kiszka <[email protected]>
#
# This work is licensed under the terms of the GNU GPL version 2.
#
import gdb
from linux import cpus, utils, lists, constants
module_type = utils.CachedType("struct module")
def module_list():
global module_type
modules = utils.gdb_eval_or_none("modules")
if modules is None:
return
module_ptr_type = module_type.get_type().pointer()
for module in lists.list_for_each_entry(modules, module_ptr_type, "list"):
yield module
def find_module_by_name(name):
for module in module_list():
if module['name'].string() == name:
return module
return None
class LxModule(gdb.Function):
"""Find module by name and return the module variable.
$lx_module("MODULE"): Given the name MODULE, iterate over all loaded modules
of the target and return that module variable which MODULE matches."""
def __init__(self):
super(LxModule, self).__init__("lx_module")
def invoke(self, mod_name):
mod_name = mod_name.string()
module = find_module_by_name(mod_name)
if module:
return module.dereference()
else:
raise gdb.GdbError("Unable to find MODULE " + mod_name)
LxModule()
class LxLsmod(gdb.Command):
"""List currently loaded modules."""
_module_use_type = utils.CachedType("struct module_use")
def __init__(self):
super(LxLsmod, self).__init__("lx-lsmod", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
gdb.write(
"Address{0} Module Size Used by\n".format(
" " if utils.get_long_type().sizeof == 8 else ""))
for module in module_list():
text = module['mem'][constants.LX_MOD_TEXT]
text_addr = str(text['base']).split()[0]
total_size = 0
for i in range(constants.LX_MOD_TEXT, constants.LX_MOD_RO_AFTER_INIT + 1):
total_size += module['mem'][i]['size']
gdb.write("{address} {name:<19} {size:>8} {ref}".format(
address=text_addr,
name=module['name'].string(),
size=str(total_size),
ref=str(module['refcnt']['counter'] - 1)))
t = self._module_use_type.get_type().pointer()
first = True
sources = module['source_list']
for use in lists.list_for_each_entry(sources, t, "source_list"):
gdb.write("{separator}{name}".format(
separator=" " if first else ",",
name=use['source']['name'].string()))
first = False
gdb.write("\n")
LxLsmod()
def help():
t = """Usage: lx-getmod-by-textaddr [Heximal Address]
Example: lx-getmod-by-textaddr 0xffff800002d305ac\n"""
gdb.write("Unrecognized command\n")
raise gdb.GdbError(t)
class LxFindTextAddrinMod(gdb.Command):
'''Look up loaded kernel module by text address.'''
def __init__(self):
super(LxFindTextAddrinMod, self).__init__('lx-getmod-by-textaddr', gdb.COMMAND_SUPPORT)
def invoke(self, arg, from_tty):
args = gdb.string_to_argv(arg)
if len(args) != 1:
help()
addr = gdb.Value(int(args[0], 16)).cast(utils.get_ulong_type())
for mod in module_list():
mod_text_start = mod['mem'][constants.LX_MOD_TEXT]['base']
mod_text_end = mod_text_start + mod['mem'][constants.LX_MOD_TEXT]['size'].cast(utils.get_ulong_type())
if addr >= mod_text_start and addr < mod_text_end:
s = "0x%x" % addr + " is in " + mod['name'].string() + ".ko\n"
gdb.write(s)
return
gdb.write("0x%x is not in any module text section\n" % addr)
LxFindTextAddrinMod()
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