Add a gdb script to verify the consistency of lists. Signed-off-by: Thiébaud Weksteen <[email protected]> --- scripts/gdb/linux/lists.py | 78 ++++++++++++++++++++++++++++++++++++++++++++++ scripts/gdb/vmlinux-gdb.py | 1 + 2 files changed, 79 insertions(+) create mode 100644 scripts/gdb/linux/lists.py
diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py new file mode 100644 index 0000000..d512f62 --- /dev/null +++ b/scripts/gdb/linux/lists.py @@ -0,0 +1,78 @@ +# +# gdb helper commands and functions for Linux kernel debugging +# +# list tools +# +# Authors: +# Thiebaud Weksteen <[email protected]> +# +# 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 check_list(head): + nb = 0 + list_head_ptr_type = list_head.get_type().pointer() + c = head.cast(list_head_ptr_type) + try: + gdb.write("Starting with: {} {}\n".format(c, c.dereference())) + except gdb.MemoryError: + gdb.write('head is not accessible\n') + return + while True: + p = c['prev'] + n = c['next'] + try: + if p['next'] != c: + gdb.write('prev.next != current: current={current} ' + 'prev={p} prev.next={pnext}\n'.format( + current=c, + p=p, + pnext=p['next'] + )) + return + except gdb.MemoryError: + gdb.write('prev is not accessible: current={current} ' + 'current.prev={p}\n'.format( + current=c, + p=p + )) + return + try: + if n['prev'] != c: + gdb.write('next.prev != current: current={current} ' + 'next={n}, next.prev={nprev}\n'.format( + current=c, + n=n, + nprev=n['prev'] + )) + return + except gdb.MemoryError: + gdb.write('next is not accessible: current={current} ' + 'current.next={n}\n'.format( + current=c, + n=n + )) + return + c = n + nb += 1 + if c == head: + gdb.write("list is consistent: {} node(s)\n".format(nb)) + return + +class LxChkList(gdb.Command): + """Verify a list consistency""" + + def __init__(self): + super(LxChkList, self).__init__("lx-check-list", gdb.COMMAND_DATA) + + def invoke(self, arg, from_tty): + argv = gdb.string_to_argv(arg) + check_list(gdb.parse_and_eval(argv[0])) + +LxChkList() diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py index 4848928..ce82bf5 100644 --- a/scripts/gdb/vmlinux-gdb.py +++ b/scripts/gdb/vmlinux-gdb.py @@ -28,3 +28,4 @@ else: import linux.dmesg import linux.tasks import linux.cpus + import linux.lists -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
