qemu

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tcg.py (1469B)

      1 # -*- coding: utf-8 -*-
      2 #
      3 # GDB debugging support, TCG status
      4 #
      5 # Copyright 2016 Linaro Ltd
      6 #
      7 # Authors:
      8 #  Alex Bennée <alex.bennee@linaro.org>
      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))