1 #
2 # gdb helper commands and functions for Linux
3 #
4 # task & thread tools
5 #
6 # Copyright (c) Siemens AG, 2011-2013
7 #
8 # Authors:
9 # Jan Kiszka <jan.kiszka@siemens.com>
10 #
11 # This work is licensed under the terms of the
12 #
13
14 import gdb
15
16 from linux import utils, lists
17
18
19 task_type = utils.CachedType("struct task_stru
20
21
22 def task_lists():
23 task_ptr_type = task_type.get_type().point
24 init_task = gdb.parse_and_eval("init_task"
25 t = init_task
26
27 while True:
28 thread_head = t['signal']['thread_head
29 for thread in lists.list_for_each_entr
30 yield thread
31
32 t = utils.container_of(t['tasks']['nex
33 task_ptr_type,
34 if t == init_task:
35 return
36
37
38 def get_task_by_pid(pid):
39 for task in task_lists():
40 if int(task['pid']) == pid:
41 return task
42 return None
43
44
45 class LxTaskByPidFunc(gdb.Function):
46 """Find Linux task by PID and return the t
47
48 $lx_task_by_pid(PID): Given PID, iterate over
49 return that task_struct variable which PID mat
50
51 def __init__(self):
52 super(LxTaskByPidFunc, self).__init__(
53
54 def invoke(self, pid):
55 task = get_task_by_pid(pid)
56 if task:
57 return task.dereference()
58 else:
59 raise gdb.GdbError("No task of PID
60
61
62 LxTaskByPidFunc()
63
64
65 class LxPs(gdb.Command):
66 """Dump Linux tasks."""
67
68 def __init__(self):
69 super(LxPs, self).__init__("lx-ps", gd
70
71 def invoke(self, arg, from_tty):
72 gdb.write("{:>10} {:>12} {:>7}\n".form
73 for task in task_lists():
74 gdb.write("{} {:^5} {}\n".format(
75 task.format_string().split()[0
76 task["pid"].format_string(),
77 task["comm"].string()))
78
79
80 LxPs()
81
82
83 thread_info_type = utils.CachedType("struct th
84
85
86 def get_thread_info(task):
87 thread_info_ptr_type = thread_info_type.ge
88 if task_type.get_type().fields()[0].type =
89 return task['thread_info']
90 thread_info = task['stack'].cast(thread_in
91 return thread_info.dereference()
92
93
94 class LxThreadInfoFunc (gdb.Function):
95 """Calculate Linux thread_info from task v
96
97 $lx_thread_info(TASK): Given TASK, return the
98 variable."""
99
100 def __init__(self):
101 super(LxThreadInfoFunc, self).__init__
102
103 def invoke(self, task):
104 return get_thread_info(task)
105
106
107 LxThreadInfoFunc()
108
109
110 class LxThreadInfoByPidFunc (gdb.Function):
111 """Calculate Linux thread_info from task v
112
113 $lx_thread_info_by_pid(PID): Given PID, return
114 variable."""
115
116 def __init__(self):
117 super(LxThreadInfoByPidFunc, self).__i
118
119 def invoke(self, pid):
120 task = get_task_by_pid(pid)
121 if task:
122 return get_thread_info(task.derefe
123 else:
124 raise gdb.GdbError("No task of PID
125
126
127 LxThreadInfoByPidFunc()
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