scripts/qemugdb/tcg.py

   1 #!/usr/bin/python
   2 # -*- coding: utf-8 -*-
   3 #
   4 # GDB debugging support, TCG status
   5 #
   6 # Copyright 2016 Linaro Ltd
   7 #
   8 # Authors:
   9 #  Alex Bennée <alex.bennee@linaro.org>
  10 #
  11 # This work is licensed under the terms of the GNU GPL, version 2.  See
  12 # the COPYING file in the top-level directory.
  13 #
  14 # Contributions after 2012-01-13 are licensed under the terms of the
  15 # GNU GPL, version 2 or (at your option) any later version.
  16
  17 # 'qemu tcg-lock-status' -- display the TCG lock status across threads
  18
  19 import gdb
  20
  21 class TCGLockStatusCommand(gdb.Command):
  22     '''Display TCG Execution Status'''
  23     def __init__(self):
  24         gdb.Command.__init__(self, 'qemu tcg-lock-status', gdb.COMMAND_DATA,
  25                              gdb.COMPLETE_NONE)
  26
  27     def invoke(self, arg, from_tty):
  28         gdb.write("Thread, BQL (iothread_mutex), Replay, Blocked?\n")
  29         for thread in gdb.inferiors()[0].threads():
  30             thread.switch()
  31
  32             iothread = gdb.parse_and_eval("iothread_locked")
  33             replay = gdb.parse_and_eval("replay_locked")
  34
  35             frame = gdb.selected_frame()
  36             if frame.name() == "__lll_lock_wait":
  37                 frame.older().select()
  38                 mutex = gdb.parse_and_eval("mutex")
  39                 owner = gdb.parse_and_eval("mutex->__data.__owner")
  40                 blocked = ("__lll_lock_wait waiting on %s from %d" %
  41                            (mutex, owner))
  42             else:
  43                 blocked = "not blocked"
  44
  45             gdb.write("%d/%d, %s, %s, %s\n" % (thread.num, thread.ptid[1],
  46                                                iothread, replay, blocked))