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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137## 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")hlist_head = utils.CachedType("struct hlist_head")hlist_node = utils.CachedType("struct hlist_node")
def list_for_each(head): if head.type == list_head.get_type().pointer(): head = head.dereference() elif head.type != list_head.get_type(): raise TypeError("Must be struct list_head not {}" .format(head.type))
if head['next'] == 0: gdb.write("list_for_each: Uninitialized list '{}' treated as empty\n" .format(head.address)) return
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): yield utils.container_of(node, gdbtype, member)
def hlist_for_each(head): if head.type == hlist_head.get_type().pointer(): head = head.dereference() elif head.type != hlist_head.get_type(): raise TypeError("Must be struct hlist_head not {}" .format(head.type))
node = head['first'].dereference() while node.address: yield node.address node = node['next'].dereference()
def hlist_for_each_entry(head, gdbtype, member): for node in hlist_for_each(head): 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()