# Copyright 2012 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import re
import sys
import xml.etree.ElementTree
import gdb_rsp
def AssertRaises(exc_class, func):
try:
func()
except exc_class:
pass
else:
raise AssertionError('Function did not raise %r' % exc_class)
def GetTargetArch(connection):
"""Get the CPU architecture of the NaCl application."""
reply = connection.RspRequest('qXfer:features:read:target.xml:0,fff')
assert reply[0] == 'l', reply
tree = xml.etree.ElementTree.fromstring(reply[1:])
arch_tag = tree.find('architecture')
assert arch_tag is not None, reply
return arch_tag.text.strip()
def ReverseBytes(byte_string):
"""Reverse bytes in the hex string: '09ab' -> 'ab09'. This converts
little-endian number in the hex string to its normal string representation.
"""
assert len(byte_string) % 2 == 0, byte_string
return ''.join([byte_string[i - 2 : i]
for i in range(len(byte_string), 0, -2)])
def GetProgCtrString(connection, arch):
"""Get current execution point."""
registers = connection.RspRequest('g')
# PC register indices can be found in
# native_client/src/trusted/debug_stub/abi.cc in AbiInit function.
if arch == 'i386':
# eip index is 8
return ReverseBytes(registers[8 * 8 : 8 * 8 + 8])
if arch == 'i386:x86-64':
# rip index is 16
return ReverseBytes(registers[16 * 16 : 16 * 16 + 8])
if arch == 'iwmmxt':
# pc index is 15
return ReverseBytes(registers[15 * 8 : 15 * 8 + 8])
raise AssertionError('Unknown architecture: %s' % arch)
def TestContinue(connection):
# Once the NaCl test module reports that the test passed, the NaCl <embed>
# element is removed from the page. The NaCl module will be killed by the
# browser which will appear as EOF (end-of-file) on the debug stub socket.
AssertRaises(gdb_rsp.EofOnReplyException,
lambda: connection.RspRequest('vCont;c'))
def TestBreakpoint(connection):
# Breakpoints and single-stepping might interfere with Chrome sandbox. So we
# check that they work properly in this test.
arch = GetTargetArch(connection)
registers = connection.RspRequest('g')
pc = GetProgCtrString(connection, arch)
# Set breakpoint
result = connection.RspRequest('Z0,%s,1' % pc)
assert result == 'OK', result
# Check that we stopped at breakpoint
result = connection.RspRequest('vCont;c')
stop_reply = re.compile(r'T05thread:(\d+);')
assert stop_reply.match(result), result
thread = stop_reply.match(result).group(1)
# Check that registers haven't changed
result = connection.RspRequest('g')
assert result == registers, (result, registers)
# Remove breakpoint
result = connection.RspRequest('z0,%s,1' % pc)
assert result == 'OK', result
# Check single stepping
result = connection.RspRequest('vCont;s:%s' % thread)
assert result == 'T05thread:%s;' % thread, result
assert pc != GetProgCtrString(connection, arch)
# Check that we terminate normally
AssertRaises(gdb_rsp.EofOnReplyException,
lambda: connection.RspRequest('vCont;c'))
def Main(args):
port = int(args[0])
name = args[1]
connection = gdb_rsp.GdbRspConnection(('localhost', port))
if name == 'continue':
TestContinue(connection)
elif name == 'breakpoint':
TestBreakpoint(connection)
else:
raise AssertionError('Unknown test name: %r' % name)
if __name__ == '__main__':
Main(sys.argv[1:])
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