| # |
| # 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_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() |