scripts/qemugdb/tcg.py

   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))