| # Copyright 2014 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """Connect to a DUT in firmware via remote GDB, install custom GDB commands.""" |
| |
| import errno |
| import logging |
| import os |
| import re |
| import signal |
| import socket |
| import time |
| |
| from chromite.cbuildbot import constants |
| from chromite.lib import commandline |
| from chromite.lib import cros_build_lib |
| from chromite.lib import timeout_util |
| |
| # pylint: disable=W0622 |
| from chromite.lib.cros_build_lib import Error, Warning, Info, Debug |
| |
| # Need to do this before Servo import |
| cros_build_lib.AssertInsideChroot() |
| |
| from servo import client |
| from servo import multiservo |
| |
| _SRC_ROOT = os.path.join(constants.CHROOT_SOURCE_ROOT, 'src') |
| _SRC_DC = os.path.join(_SRC_ROOT, 'platform/depthcharge') |
| _SRC_VB = os.path.join(_SRC_ROOT, 'platform/vboot_reference') |
| _SRC_LP = os.path.join(_SRC_ROOT, 'third_party/coreboot/payloads/libpayload') |
| |
| _PTRN_DEVMODE = 'Entering VbBootDeveloper()' |
| _PTRN_GDB = 'Ready for GDB connection' |
| _PTRN_BOARD = 'Starting(?: read-only| read/write)? depthcharge on ([a-z_]+)...' |
| |
| |
| class TerminalFreezer(object): |
| """SIGSTOP all processes (and their parents) that have the TTY open.""" |
| |
| def __init__(self, tty): |
| self._tty = tty |
| self._processes = None |
| |
| def __enter__(self): |
| lsof = cros_build_lib.RunCommand(['lsof', '-FR', self._tty], |
| capture_output=True, log_output=True, error_code_ok=True) |
| self._processes = re.findall(r'^(?:R|p)(\d+)$', lsof.output, re.MULTILINE) |
| |
| # SIGSTOP parents before children |
| try: |
| for p in reversed(self._processes): |
| Info('Sending SIGSTOP to process %s!', p) |
| time.sleep(0.02) |
| os.kill(int(p), signal.SIGSTOP) |
| except OSError: |
| self.__exit__(None, None, None) |
| raise |
| |
| def __exit__(self, _t, _v, _b): |
| # ...and wake 'em up again in reverse order |
| for p in self._processes: |
| Info('Sending SIGCONT to process %s!', p) |
| try: |
| os.kill(int(p), signal.SIGCONT) |
| except OSError as e: |
| Error("Error when trying to unfreeze process %s: %s" % (p, str(e))) |
| |
| |
| def ParsePortage(board): |
| """Parse some data from portage files. equery takes ages in comparison.""" |
| with open(os.path.join('/build', board, 'packages/Packages'), 'r') as f: |
| chost = None |
| use = None |
| for line in f: |
| if line[:7] == 'CHOST: ': |
| chost = line[7:].strip() |
| if line[:5] == 'USE: ': |
| use = line[5:].strip() |
| if chost and use: |
| return (chost, use) |
| |
| |
| def ParseArgs(argv): |
| """Parse and validate command line arguments.""" |
| parser = commandline.ArgumentParser(default_log_level='warning') |
| |
| parser.add_argument('-b', '--board', |
| help='The board overlay name (auto-detect by default)') |
| parser.add_argument('-s', '--symbols', |
| help='Root directory or complete path to symbolized ELF ' |
| '(defaults to /build/<BOARD>/firmware)') |
| parser.add_argument('-r', '--reboot', choices=['yes', 'no', 'auto'], |
| help='Reboot the DUT before connect (default: reboot if ' |
| 'the remote and is unreachable)', default='auto') |
| parser.add_argument('-e', '--execute', action='append', default=[], |
| help='GDB command to run after connect (can be supplied ' |
| 'multiple times)') |
| |
| parser.add_argument('-n', '--servod-name', dest='name') |
| parser.add_argument('--servod-rcfile', default=multiservo.DEFAULT_RC_FILE) |
| parser.add_argument('--servod-server') |
| parser.add_argument('-p', '--servod-port', type=int, dest='port') |
| parser.add_argument('-t', '--tty', |
| help='TTY file to connect to (defaults to cpu_uart_pty)') |
| |
| opts = parser.parse_args(argv) |
| multiservo.get_env_options(logging, opts) |
| if opts.name: |
| rc = multiservo.parse_rc(logging, opts.servod_rcfile) |
| if opts.name not in rc: |
| raise parser.error('%s not in %s' % (opts.name, opts.servod_rcfile)) |
| if not opts.servod_server: |
| opts.servod_server = rc[opts.name]['sn'] |
| if not opts.port: |
| opts.port = rc[opts.name].get('port', client.DEFAULT_PORT) |
| if not opts.board and 'board' in rc[opts.name]: |
| opts.board = rc[opts.name]['board'] |
| Warning('Inferring board %s from %s... make sure this is correct!', |
| opts.board, opts.servod_rcfile) |
| |
| if not opts.servod_server: |
| opts.servod_server = client.DEFAULT_HOST |
| if not opts.port: |
| opts.port = client.DEFAULT_PORT |
| |
| return opts |
| |
| |
| def FindSymbols(firmware_dir, board, use): |
| """Find the symbolized depthcharge ELF (may be supplied by -s flag).""" |
| if not firmware_dir: |
| firmware_dir = os.path.join(cros_build_lib.GetSysroot(board), 'firmware') |
| # Allow overriding the file directly just in case our detection screws up |
| if firmware_dir.endswith('.elf'): |
| return firmware_dir |
| |
| if 'unified_depthcharge' in use: |
| basename = 'dev.elf' |
| else: |
| basename = 'dev.ro.elf' |
| |
| path = os.path.join(firmware_dir, 'depthcharge', basename) |
| if not os.path.exists(path): |
| path = os.path.join(firmware_dir, basename) |
| |
| if os.path.exists(path): |
| Warning('Auto-detected symbol file at %s... make sure that this matches ' |
| 'the image on your DUT!', path) |
| return path |
| |
| raise ValueError('Could not find %s symbol file!' % basename) |
| |
| |
| # TODO(jwerner): Fine tune |wait| delay or maybe even make it configurable if |
| # this causes problems due to load on the host. The callers where this is |
| # critical should all have their own timeouts now, though, so it's questionable |
| # whether the delay here is even needed at all anymore. |
| def ReadAll(fd, wait=0.03): |
| """Read from |fd| until no more data has come for at least |wait| seconds.""" |
| data = '' |
| try: |
| while True: |
| time.sleep(wait) |
| data += os.read(fd, 4096) |
| except OSError as e: |
| if e.errno == errno.EAGAIN: |
| Debug(data) |
| return data |
| raise |
| |
| |
| def GdbChecksum(message): |
| """Calculate a remote-GDB style checksum.""" |
| chksum = sum([ord(x) for x in message]) |
| return ('%.2x' % chksum)[-2:] |
| |
| |
| def TestConnection(fd): |
| """Return True iff there is a resposive GDB stub on the other end of 'fd'.""" |
| cmd = 'vUnknownCommand' |
| for _ in xrange(3): |
| os.write(fd, '$%s#%s\n' % (cmd, GdbChecksum(cmd))) |
| reply = ReadAll(fd) |
| if '+$#00' in reply: |
| os.write(fd, '+') |
| Info('TestConnection: Could successfully connect to remote end.') |
| return True |
| Info('TestConnection: Remote end does not respond.') |
| return False |
| |
| |
| def main(argv): |
| opts = ParseArgs(argv) |
| servo = client.ServoClient(host=opts.servod_server, port=opts.port) |
| |
| if not opts.tty: |
| try: |
| opts.tty = servo.get('cpu_uart_pty') |
| except (client.ServoClientError, socket.error): |
| Error('Cannot auto-detect TTY file without servod. Use the --tty option.') |
| raise |
| with TerminalFreezer(opts.tty): |
| fd = os.open(opts.tty, os.O_RDWR | os.O_NONBLOCK) |
| |
| data = ReadAll(fd) |
| if opts.reboot == 'auto': |
| if TestConnection(fd): |
| opts.reboot = 'no' |
| else: |
| opts.reboot = 'yes' |
| |
| if opts.reboot == 'yes': |
| Info('Rebooting DUT...') |
| try: |
| servo.set('warm_reset', 'on') |
| time.sleep(0.1) |
| servo.set('warm_reset', 'off') |
| except (client.ServoClientError, socket.error): |
| Error('Cannot reboot without a Servo board. You have to boot into ' |
| 'developer mode and press CTRL+G manually before running fwgdb.') |
| raise |
| |
| # Throw away old data to avoid confusion from messages before the reboot |
| data = '' |
| with timeout_util.Timeout(10, 'Could not reboot into developer mode! ' |
| '(Confirm that you have GBB_FLAG_FORCE_DEV_SWITCH_ON (0x8) set.)'): |
| while _PTRN_DEVMODE not in data: |
| data += ReadAll(fd) |
| |
| # Send a CTRL+G |
| Info('Developer mode detected, pressing CTRL+G...') |
| os.write(fd, chr(ord('G') & 0x1f)) |
| |
| with timeout_util.Timeout(1, 'Could not enter GDB mode with CTRL+G! ' |
| '(Confirm that you flashed an "image.dev.bin" image to this DUT.)'): |
| while _PTRN_GDB not in data: |
| data += ReadAll(fd) |
| |
| if not opts.board: |
| matches = re.findall(_PTRN_BOARD, data) |
| if not matches: |
| raise ValueError('Could not auto-detect board! Please use -b option.') |
| opts.board = matches[-1] |
| Info('Auto-detected board as %s from DUT console output.', opts.board) |
| |
| if not TestConnection(fd): |
| raise IOError('Could not connect to remote end! Confirm that your DUT is ' |
| 'running in GDB mode on %s.' % opts.tty) |
| |
| # Eat up leftover data or it will spill back to terminal |
| ReadAll(fd) |
| os.close(fd) |
| |
| opts.execute.insert(0, 'target remote %s' % opts.tty) |
| ex_args = sum([['--ex', cmd] for cmd in opts.execute], []) |
| |
| chost, use = ParsePortage(opts.board) |
| Info('Launching GDB...') |
| cros_build_lib.RunCommand([chost + '-gdb', |
| '--symbols', FindSymbols(opts.symbols, opts.board, use), |
| '--directory', _SRC_DC, |
| '--directory', _SRC_VB, |
| '--directory', _SRC_LP] + ex_args, |
| ignore_sigint=True, debug_level=logging.WARNING) |
