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Subject[PATCH] scripts/gdb: Add command to check list consistency
Add a gdb script to verify the consistency of lists.

Signed-off-by: Thiébaud Weksteen <thiebaud@weksteen.fr>
---
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 <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 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

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