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1 # -*- coding: utf-8 -*-
2 #
3 # GDB debugging support, TCG status
4 #
5 # Copyright 2016 Linaro Ltd
6 #
7 # Authors:
8 #  Alex BennĂ©e <[email protected]>
9 #
10 # This work is licensed under the terms of the GNU GPL, version 2 or
11 # later.  See the COPYING file in the top-level directory.
12
13 # 'qemu tcg-lock-status' -- display the TCG lock status across threads
14
15 import gdb
16
17 class TCGLockStatusCommand(gdb.Command):
18     '''Display TCG Execution Status'''
19     def __init__(self):
20         gdb.Command.__init__(self, 'qemu tcg-lock-status', gdb.COMMAND_DATA,
21                              gdb.COMPLETE_NONE)
22
23     def invoke(self, arg, from_tty):
24         gdb.write("Thread, BQL (iothread_mutex), Replay, Blocked?\n")
25         for thread in gdb.inferiors()[0].threads():
26             thread.switch()
27
28             iothread = gdb.parse_and_eval("iothread_locked")
29             replay = gdb.parse_and_eval("replay_locked")
30
31             frame = gdb.selected_frame()
32             if frame.name() == "__lll_lock_wait":
33                 frame.older().select()
34                 mutex = gdb.parse_and_eval("mutex")
35                 owner = gdb.parse_and_eval("mutex->__data.__owner")
36                 blocked = ("__lll_lock_wait waiting on %s from %d" %
37                            (mutex, owner))
38             else:
39                 blocked = "not blocked"
40
41             gdb.write("%d/%d, %s, %s, %s\n" % (thread.num, thread.ptid[1],
42                                                iothread, replay, blocked))
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