59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
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#!/usr/bin/python
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# GDB debugging support: aio/iohandler debug
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#
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# Copyright (c) 2015 Red Hat, Inc.
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#
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# Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2 or
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# later. See the COPYING file in the top-level directory.
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#
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import gdb
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from qemugdb import coroutine
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def isnull(ptr):
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return ptr == gdb.Value(0).cast(ptr.type)
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def dump_aiocontext(context, verbose):
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'''Display a dump and backtrace for an aiocontext'''
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cur = context['aio_handlers']['lh_first']
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# Get pointers to functions we're going to process specially
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sym_fd_coroutine_enter = gdb.parse_and_eval('fd_coroutine_enter')
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while not isnull(cur):
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entry = cur.dereference()
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gdb.write('----\n%s\n' % entry)
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if verbose and cur['io_read'] == sym_fd_coroutine_enter:
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coptr = (cur['opaque'].cast(gdb.lookup_type('FDYieldUntilData').pointer()))['co']
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coptr = coptr.cast(gdb.lookup_type('CoroutineUContext').pointer())
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coroutine.bt_jmpbuf(coptr['env']['__jmpbuf'])
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cur = cur['node']['le_next'];
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gdb.write('----\n')
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class HandlersCommand(gdb.Command):
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'''Display aio handlers'''
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def __init__(self):
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gdb.Command.__init__(self, 'qemu handlers', gdb.COMMAND_DATA,
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gdb.COMPLETE_NONE)
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def invoke(self, arg, from_tty):
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verbose = False
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argv = gdb.string_to_argv(arg)
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if len(argv) > 0 and argv[0] == '--verbose':
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verbose = True
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argv.pop(0)
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if len(argv) > 1:
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gdb.write('usage: qemu handlers [--verbose] [handler]\n')
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return
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if len(argv) == 1:
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handlers_name = argv[0]
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else:
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handlers_name = 'qemu_aio_context'
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dump_aiocontext(gdb.parse_and_eval(handlers_name), verbose)
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