scripts/gdb: provide kernel list item generators

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 <[email protected]> Signed-off-by: Jan Kiszka <[email protected]> Cc: Jeff Mahoney <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
mrcsosa · May 24, 2016 · a84be61 · a84be61
1 parent f197d75
commit a84be61
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
@@ -18,6 +18,27 @@
 list_head = utils.CachedType("struct list_head")
 
 
+def list_for_each(head):
+    if head.type == list_head.get_type().pointer():
+        head = head.dereference()
+    elif head.type != list_head.get_type():
+        raise gdb.GdbError("Must be struct list_head not {}"
+                           .format(head.type))
+
+    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):
+        if node.type != list_head.get_type().pointer():
+            raise TypeError("Type {} found. Expected struct list_head *."
+                            .format(node.type))
+        yield utils.container_of(node, gdbtype, member)
+
+
 def list_check(head):
     nb = 0
     if (head.type == list_head.get_type().pointer()):