forked from mirrors/linux
a84be61d0e
Facilitate linked-list items by providing a generator to return the dereferenced, and type-cast objects from a kernel linked list Link: http://lkml.kernel.org/r/2b0998564e6e5abe53585d466f87e491331fd2a4.1462865983.git.jan.kiszka@siemens.com Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
#
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# gdb helper commands and functions for Linux kernel debugging
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#
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# list tools
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#
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# Copyright (c) Thiebaud Weksteen, 2015
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#
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# Authors:
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# Thiebaud Weksteen <thiebaud@weksteen.fr>
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#
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# This work is licensed under the terms of the GNU GPL version 2.
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#
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import gdb
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from linux import utils
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list_head = utils.CachedType("struct list_head")
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def list_for_each(head):
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if head.type == list_head.get_type().pointer():
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head = head.dereference()
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elif head.type != list_head.get_type():
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raise gdb.GdbError("Must be struct list_head not {}"
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.format(head.type))
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node = head['next'].dereference()
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while node.address != head.address:
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yield node.address
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node = node['next'].dereference()
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def list_for_each_entry(head, gdbtype, member):
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for node in list_for_each(head):
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if node.type != list_head.get_type().pointer():
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raise TypeError("Type {} found. Expected struct list_head *."
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.format(node.type))
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yield utils.container_of(node, gdbtype, member)
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def list_check(head):
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nb = 0
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if (head.type == list_head.get_type().pointer()):
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head = head.dereference()
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elif (head.type != list_head.get_type()):
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raise gdb.GdbError('argument must be of type (struct list_head [*])')
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c = head
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try:
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gdb.write("Starting with: {}\n".format(c))
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except gdb.MemoryError:
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gdb.write('head is not accessible\n')
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return
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while True:
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p = c['prev'].dereference()
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n = c['next'].dereference()
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try:
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if p['next'] != c.address:
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gdb.write('prev.next != current: '
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'current@{current_addr}={current} '
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'prev@{p_addr}={p}\n'.format(
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current_addr=c.address,
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current=c,
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p_addr=p.address,
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p=p,
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))
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return
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except gdb.MemoryError:
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gdb.write('prev is not accessible: '
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'current@{current_addr}={current}\n'.format(
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current_addr=c.address,
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current=c
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))
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return
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try:
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if n['prev'] != c.address:
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gdb.write('next.prev != current: '
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'current@{current_addr}={current} '
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'next@{n_addr}={n}\n'.format(
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current_addr=c.address,
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current=c,
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n_addr=n.address,
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n=n,
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))
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return
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except gdb.MemoryError:
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gdb.write('next is not accessible: '
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'current@{current_addr}={current}\n'.format(
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current_addr=c.address,
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current=c
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))
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return
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c = n
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nb += 1
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if c == head:
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gdb.write("list is consistent: {} node(s)\n".format(nb))
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return
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class LxListChk(gdb.Command):
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"""Verify a list consistency"""
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def __init__(self):
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super(LxListChk, self).__init__("lx-list-check", gdb.COMMAND_DATA,
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gdb.COMPLETE_EXPRESSION)
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def invoke(self, arg, from_tty):
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argv = gdb.string_to_argv(arg)
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if len(argv) != 1:
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raise gdb.GdbError("lx-list-check takes one argument")
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list_check(gdb.parse_and_eval(argv[0]))
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LxListChk()
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