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#
# gdb helper commands and functions for Linux kernel debugging
#
#  module tools
#
# Copyright (c) Siemens AG, 2013
#
# Authors:
#  Jan Kiszka <jan.kiszka@siemens.com>
#
# This work is licensed under the terms of the GNU GPL version 2.
#

import gdb

from linux import cpus, utils, lists


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():
            layout = module['core_layout']
            gdb.write("{address} {name:<19} {size:>8}  {ref}".format(
                address=str(layout['base']).split()[0],
                name=module['name'].string(),
                size=str(layout['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()

Filemanager

Name Type Size Permission Actions
.gitignore File 25 B 0644
Makefile File 599 B 0644
__init__.py File 55 B 0644
constants.py.in File 1.3 KB 0644
cpus.py File 4.44 KB 0644
dmesg.py File 2.43 KB 0644
lists.py File 3.55 KB 0644
modules.py File 2.54 KB 0644
proc.py File 8.41 KB 0644
symbols.py File 6.28 KB 0644
tasks.py File 3.46 KB 0644
utils.py File 4.72 KB 0644