1 # 1 #
2 # gdb helper commands and functions for Linux 2 # gdb helper commands and functions for Linux kernel debugging
3 # 3 #
4 # task & thread tools 4 # task & thread tools
5 # 5 #
6 # Copyright (c) Siemens AG, 2011-2013 6 # Copyright (c) Siemens AG, 2011-2013
7 # 7 #
8 # Authors: 8 # Authors:
9 # Jan Kiszka <jan.kiszka@siemens.com> 9 # Jan Kiszka <jan.kiszka@siemens.com>
10 # 10 #
11 # This work is licensed under the terms of the 11 # This work is licensed under the terms of the GNU GPL version 2.
12 # 12 #
13 13
14 import gdb 14 import gdb
15 15
16 from linux import utils, lists !! 16 from linux import utils
17 17
18 18
19 task_type = utils.CachedType("struct task_stru 19 task_type = utils.CachedType("struct task_struct")
20 20
21 21
22 def task_lists(): 22 def task_lists():
23 task_ptr_type = task_type.get_type().point 23 task_ptr_type = task_type.get_type().pointer()
24 init_task = gdb.parse_and_eval("init_task" 24 init_task = gdb.parse_and_eval("init_task").address
25 t = init_task !! 25 t = g = init_task
26 26
27 while True: 27 while True:
28 thread_head = t['signal']['thread_head !! 28 while True:
29 for thread in lists.list_for_each_entr !! 29 yield t
30 yield thread <<
31 30
32 t = utils.container_of(t['tasks']['nex !! 31 t = utils.container_of(t['thread_group']['next'],
33 task_ptr_type, !! 32 task_ptr_type, "thread_group")
>> 33 if t == g:
>> 34 break
>> 35
>> 36 t = g = utils.container_of(g['tasks']['next'],
>> 37 task_ptr_type, "tasks")
34 if t == init_task: 38 if t == init_task:
35 return 39 return
36 40
37 41
38 def get_task_by_pid(pid): 42 def get_task_by_pid(pid):
39 for task in task_lists(): 43 for task in task_lists():
40 if int(task['pid']) == pid: 44 if int(task['pid']) == pid:
41 return task 45 return task
42 return None 46 return None
43 47
44 48
45 class LxTaskByPidFunc(gdb.Function): 49 class LxTaskByPidFunc(gdb.Function):
46 """Find Linux task by PID and return the t 50 """Find Linux task by PID and return the task_struct variable.
47 51
48 $lx_task_by_pid(PID): Given PID, iterate over 52 $lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and
49 return that task_struct variable which PID mat 53 return that task_struct variable which PID matches."""
50 54
51 def __init__(self): 55 def __init__(self):
52 super(LxTaskByPidFunc, self).__init__( 56 super(LxTaskByPidFunc, self).__init__("lx_task_by_pid")
53 57
54 def invoke(self, pid): 58 def invoke(self, pid):
55 task = get_task_by_pid(pid) 59 task = get_task_by_pid(pid)
56 if task: 60 if task:
57 return task.dereference() 61 return task.dereference()
58 else: 62 else:
59 raise gdb.GdbError("No task of PID 63 raise gdb.GdbError("No task of PID " + str(pid))
60 64
61 65
62 LxTaskByPidFunc() 66 LxTaskByPidFunc()
63 67
64 68
65 class LxPs(gdb.Command): 69 class LxPs(gdb.Command):
66 """Dump Linux tasks.""" 70 """Dump Linux tasks."""
67 71
68 def __init__(self): 72 def __init__(self):
69 super(LxPs, self).__init__("lx-ps", gd 73 super(LxPs, self).__init__("lx-ps", gdb.COMMAND_DATA)
70 74
71 def invoke(self, arg, from_tty): 75 def invoke(self, arg, from_tty):
72 gdb.write("{:>10} {:>12} {:>7}\n".form <<
73 for task in task_lists(): 76 for task in task_lists():
74 gdb.write("{} {:^5} {}\n".format( !! 77 gdb.write("{address} {pid} {comm}\n".format(
75 task.format_string().split()[0 !! 78 address=task,
76 task["pid"].format_string(), !! 79 pid=task["pid"],
77 task["comm"].string())) !! 80 comm=task["comm"].string()))
78 <<
79 81
80 LxPs() 82 LxPs()
81 83
82 84
83 thread_info_type = utils.CachedType("struct th 85 thread_info_type = utils.CachedType("struct thread_info")
84 86
>> 87 ia64_task_size = None
>> 88
85 89
86 def get_thread_info(task): 90 def get_thread_info(task):
87 thread_info_ptr_type = thread_info_type.ge 91 thread_info_ptr_type = thread_info_type.get_type().pointer()
88 if task_type.get_type().fields()[0].type = !! 92 if utils.is_target_arch("ia64"):
89 return task['thread_info'] !! 93 global ia64_task_size
90 thread_info = task['stack'].cast(thread_in !! 94 if ia64_task_size is None:
>> 95 ia64_task_size = gdb.parse_and_eval("sizeof(struct task_struct)")
>> 96 thread_info_addr = task.address + ia64_task_size
>> 97 thread_info = thread_info_addr.cast(thread_info_ptr_type)
>> 98 else:
>> 99 thread_info = task['stack'].cast(thread_info_ptr_type)
91 return thread_info.dereference() 100 return thread_info.dereference()
92 101
93 102
94 class LxThreadInfoFunc (gdb.Function): 103 class LxThreadInfoFunc (gdb.Function):
95 """Calculate Linux thread_info from task v 104 """Calculate Linux thread_info from task variable.
96 105
97 $lx_thread_info(TASK): Given TASK, return the 106 $lx_thread_info(TASK): Given TASK, return the corresponding thread_info
98 variable.""" 107 variable."""
99 108
100 def __init__(self): 109 def __init__(self):
101 super(LxThreadInfoFunc, self).__init__ 110 super(LxThreadInfoFunc, self).__init__("lx_thread_info")
102 111
103 def invoke(self, task): 112 def invoke(self, task):
104 return get_thread_info(task) 113 return get_thread_info(task)
105 114
106 115
107 LxThreadInfoFunc() 116 LxThreadInfoFunc()
108 117
109 118
110 class LxThreadInfoByPidFunc (gdb.Function): 119 class LxThreadInfoByPidFunc (gdb.Function):
111 """Calculate Linux thread_info from task v 120 """Calculate Linux thread_info from task variable found by pid
112 121
113 $lx_thread_info_by_pid(PID): Given PID, return 122 $lx_thread_info_by_pid(PID): Given PID, return the corresponding thread_info
114 variable.""" 123 variable."""
115 124
116 def __init__(self): 125 def __init__(self):
117 super(LxThreadInfoByPidFunc, self).__i 126 super(LxThreadInfoByPidFunc, self).__init__("lx_thread_info_by_pid")
118 127
119 def invoke(self, pid): 128 def invoke(self, pid):
120 task = get_task_by_pid(pid) 129 task = get_task_by_pid(pid)
121 if task: 130 if task:
122 return get_thread_info(task.derefe 131 return get_thread_info(task.dereference())
123 else: 132 else:
124 raise gdb.GdbError("No task of PID 133 raise gdb.GdbError("No task of PID " + str(pid))
125 <<
126 134
127 LxThreadInfoByPidFunc() 135 LxThreadInfoByPidFunc()
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