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#
# gdb helper commands and functions for Linux kernel debugging
#
#  list tools
#
# Copyright (c) Thiebaud Weksteen, 2015
#
# Authors:
#  Thiebaud Weksteen <thiebaud@weksteen.fr>
#
# This work is licensed under the terms of the GNU GPL version 2.
#

import gdb

from linux import utils

list_head = utils.CachedType("struct list_head")


def list_for_each(head):
    if head.type == list_head.get_type().pointer():
        head = head.dereference()
    elif head.type != list_head.get_type():
        raise gdb.GdbError("Must be struct list_head not {}"
                           .format(head.type))

    node = head['next'].dereference()
    while node.address != head.address:
        yield node.address
        node = node['next'].dereference()


def list_for_each_entry(head, gdbtype, member):
    for node in list_for_each(head):
        if node.type != list_head.get_type().pointer():
            raise TypeError("Type {} found. Expected struct list_head *."
                            .format(node.type))
        yield utils.container_of(node, gdbtype, member)


def list_check(head):
    nb = 0
    if (head.type == list_head.get_type().pointer()):
        head = head.dereference()
    elif (head.type != list_head.get_type()):
        raise gdb.GdbError('argument must be of type (struct list_head [*])')
    c = head
    try:
        gdb.write("Starting with: {}\n".format(c))
    except gdb.MemoryError:
        gdb.write('head is not accessible\n')
        return
    while True:
        p = c['prev'].dereference()
        n = c['next'].dereference()
        try:
            if p['next'] != c.address:
                gdb.write('prev.next != current: '
                          'current@{current_addr}={current} '
                          'prev@{p_addr}={p}\n'.format(
                              current_addr=c.address,
                              current=c,
                              p_addr=p.address,
                              p=p,
                          ))
                return
        except gdb.MemoryError:
            gdb.write('prev is not accessible: '
                      'current@{current_addr}={current}\n'.format(
                          current_addr=c.address,
                          current=c
                      ))
            return
        try:
            if n['prev'] != c.address:
                gdb.write('next.prev != current: '
                          'current@{current_addr}={current} '
                          'next@{n_addr}={n}\n'.format(
                              current_addr=c.address,
                              current=c,
                              n_addr=n.address,
                              n=n,
                          ))
                return
        except gdb.MemoryError:
            gdb.write('next is not accessible: '
                      'current@{current_addr}={current}\n'.format(
                          current_addr=c.address,
                          current=c
                      ))
            return
        c = n
        nb += 1
        if c == head:
            gdb.write("list is consistent: {} node(s)\n".format(nb))
            return


class LxListChk(gdb.Command):
    """Verify a list consistency"""

    def __init__(self):
        super(LxListChk, self).__init__("lx-list-check", gdb.COMMAND_DATA,
                                        gdb.COMPLETE_EXPRESSION)

    def invoke(self, arg, from_tty):
        argv = gdb.string_to_argv(arg)
        if len(argv) != 1:
            raise gdb.GdbError("lx-list-check takes one argument")
        list_check(gdb.parse_and_eval(argv[0]))

LxListChk()

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