1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
5 # This file is based on gdb_rsp.py file from NaCl repository.
12 def RspChecksum(data):
15 checksum = (checksum + ord(char)) % 0x100
19 class GdbRspConnection(object):
21 def __init__(self, addr):
22 self._socket = self._Connect(addr)
24 def _Connect(self, addr):
25 # We have to poll because we do not know when sel_ldr has
26 # successfully done bind() on the TCP port. This is inherently
28 # TODO(mseaborn): Add a more reliable connection mechanism to
29 # sel_ldr's debug stub.
30 timeout_in_seconds = 10
31 poll_time_in_seconds = 0.1
32 for i in xrange(int(timeout_in_seconds / poll_time_in_seconds)):
33 # On Mac OS X, we have to create a new socket FD for each retry.
34 sock = socket.socket()
38 # Retry after a delay.
39 time.sleep(poll_time_in_seconds)
42 raise Exception('Could not connect to sel_ldr\'s debug stub in %i seconds'
48 data = self._socket.recv(1024)
50 raise AssertionError('EOF on socket reached with '
51 'incomplete reply message: %r' % reply)
55 match = re.match('\+\$([^#]*)#([0-9a-fA-F]{2})$', reply)
57 raise AssertionError('Unexpected reply message: %r' % reply)
58 reply_body = match.group(1)
59 checksum = match.group(2)
60 expected_checksum = '%02x' % RspChecksum(reply_body)
61 if checksum != expected_checksum:
62 raise AssertionError('Bad RSP checksum: %r != %r' %
63 (checksum, expected_checksum))
64 # Send acknowledgement.
65 self._socket.send('+')
68 # Send an rsp message, but don't wait for or expect a reply.
69 def RspSendOnly(self, data):
70 msg = '$%s#%02x' % (data, RspChecksum(data))
71 return self._socket.send(msg)
73 def RspRequest(self, data):
74 self.RspSendOnly(data)
75 return self._GetReply()
77 def RspInterrupt(self):
78 self._socket.send('\x03')
79 return self._GetReply()