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