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103 lines
3.9 KiB
103 lines
3.9 KiB
#
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# Copyright © 2019 Collabora Ltd.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice (including the
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# next paragraph) shall be included in all copies or substantial
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# portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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#
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# Usage: source this script then 'display_flight_rec'
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#
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import gdb
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class DisplayFlightRecorder(gdb.Command):
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def __init__(self):
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self.rb = ''
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symbol_found = False
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ring_buff = gdb.lookup_global_symbol("weston_primary_flight_recorder_ring_buffer")
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if ring_buff == None:
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print("'weston_ring_buffer' symbol not found!")
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print("Either weston is too old or weston hasn't been loaded in memory")
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else:
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self.rb = ring_buff
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self.display_rb_data(self.rb)
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symbol_found = True
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if symbol_found:
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super(DisplayFlightRecorder, self).__init__("display_flight_rec",
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gdb.COMMAND_DATA)
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def display_rb_data(self, rb):
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print("Flight recorder data found. Use 'display_flight_rec' "
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"to display its contents")
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# display this data (only) if symbol is not empty (happens if the program is not ran at all)
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if rb.value():
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print("Data at byte {append}, Size: {size}B, "
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"Overlapped: {overlap}".format(append=rb.value()['append_pos'],
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size=rb.value()['size'],
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overlap=rb.value()['overlap']))
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# poor's man fwrite()
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def gen_contents(self, start, stop):
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_str = ''
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for j in range(start, stop):
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_str += chr(self.rb.value()['buf'][j])
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return _str
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# mirrors C version, as to make sure we're not reading other parts...
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def display_flight_rec_contents(self):
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# symbol is there but not loaded, we're not far enough
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if self.rb.value() == 0x0:
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print("Flight recorder found, but not loaded yet!")
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return
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else:
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print("Displaying flight recorder contents:")
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append_pos = self.rb.value()['append_pos']
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size = self.rb.value()['size']
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overlap = self.rb.value()['overlap']
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# if we haven't overflown and we're still at 0 means
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# we still aren't far enough to be populated
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if append_pos == 0 and not overlap:
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print("Flight recorder doesn't have anything to display right now")
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return
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# now we can print stuff
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rb_data = ''
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if not overlap:
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if append_pos:
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rb_data = self.gen_contents(0, append_pos)
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else:
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rb_data = self.gen_contents(0, size)
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else:
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rb_data = self.gen_contents(append_pos, size)
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rb_data += self.gen_contents(0, append_pos)
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print("{data}".format(data=rb_data))
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# called when invoking 'display_flight_rec'
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def invoke(self, arg, from_tty):
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self.display_flight_rec_contents()
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DisplayFlightRecorder()
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