2 # gdb helper commands and functions for Linux kernel debugging
6 # Copyright (c) Siemens AG, 2011-2013
9 # Jan Kiszka <jan.kiszka@siemens.com>
11 # This work is licensed under the terms of the GNU GPL version 2.
16 from linux import utils
19 task_type = utils.CachedType("struct task_struct")
23 task_ptr_type = task_type.get_type().pointer()
24 init_task = gdb.parse_and_eval("init_task").address
31 t = utils.container_of(t['thread_group']['next'],
32 task_ptr_type, "thread_group")
36 t = g = utils.container_of(g['tasks']['next'],
37 task_ptr_type, "tasks")
41 def get_task_by_pid(pid):
42 for task in task_lists():
43 if int(task['pid']) == pid:
48 class LxTaskByPidFunc(gdb.Function):
49 """Find Linux task by PID and return the task_struct variable.
51 $lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and
52 return that task_struct variable which PID matches."""
55 super(LxTaskByPidFunc, self).__init__("lx_task_by_pid")
57 def invoke(self, pid):
58 task = get_task_by_pid(pid)
60 return task.dereference()
62 raise gdb.GdbError("No task of PID " + str(pid))
68 thread_info_type = utils.CachedType("struct thread_info")
73 def get_thread_info(task):
74 global thread_info_type
75 thread_info_ptr_type = thread_info_type.get_type().pointer()
76 if utils.is_target_arch("ia64"):
78 if ia64_task_size is None:
79 ia64_task_size = gdb.parse_and_eval("sizeof(struct task_struct)")
80 thread_info_addr = task.address + ia64_task_size
81 thread_info = thread_info_addr.cast(thread_info_ptr_type)
83 thread_info = task['stack'].cast(thread_info_ptr_type)
84 return thread_info.dereference()
87 class LxThreadInfoFunc (gdb.Function):
88 """Calculate Linux thread_info from task variable.
90 $lx_thread_info(TASK): Given TASK, return the corresponding thread_info
94 super(LxThreadInfoFunc, self).__init__("lx_thread_info")
96 def invoke(self, task):
97 return get_thread_info(task)