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 or
  12 # later.  See the COPYING file in the top-level directory.
  13
  14 # 'qemu tcg-lock-status' -- display the TCG lock status across threads
  15
  16 import gdb
  17
  18 class TCGLockStatusCommand(gdb.Command):
  19     '''Display TCG Execution Status'''
  20     def __init__(self):
  21         gdb.Command.__init__(self, 'qemu tcg-lock-status', gdb.COMMAND_DATA,
  22                              gdb.COMPLETE_NONE)
  23
  24     def invoke(self, arg, from_tty):
  25         gdb.write("Thread, BQL (iothread_mutex), Replay, Blocked?\n")
  26         for thread in gdb.inferiors()[0].threads():
  27             thread.switch()
  28
  29             iothread = gdb.parse_and_eval("iothread_locked")
  30             replay = gdb.parse_and_eval("replay_locked")
  31
  32             frame = gdb.selected_frame()
  33             if frame.name() == "__lll_lock_wait":
  34                 frame.older().select()
  35                 mutex = gdb.parse_and_eval("mutex")
  36                 owner = gdb.parse_and_eval("mutex->__data.__owner")
  37                 blocked = ("__lll_lock_wait waiting on %s from %d" %
  38                            (mutex, owner))
  39             else:
  40                 blocked = "not blocked"
  41
  42             gdb.write("%d/%d, %s, %s, %s\n" % (thread.num, thread.ptid[1],
  43                                                iothread, replay, blocked))