#!/usr/bin/env python3 # # Copyright (C) 2015 The Android Open Source Project # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # import adb import argparse import json import logging import os import posixpath import re import shutil import subprocess import sys import tempfile import textwrap # Shared functions across gdbclient.py and ndk-gdb.py. import gdbrunner g_temp_dirs = [] def read_toolchain_config(root): """Finds out current toolchain version.""" version_output = subprocess.check_output( f'{root}/build/soong/scripts/get_clang_version.py', text=True) return version_output.strip() def get_lldb_path(toolchain_path): for lldb_name in ['lldb.sh', 'lldb.cmd', 'lldb', 'lldb.exe']: debugger_path = os.path.join(toolchain_path, "bin", lldb_name) if os.path.isfile(debugger_path): return debugger_path return None def get_lldb_server_path(root, clang_base, clang_version, arch): arch = { 'arm': 'arm', 'arm64': 'aarch64', 'x86': 'i386', 'x86_64': 'x86_64', }[arch] return os.path.join(root, clang_base, "linux-x86", clang_version, "runtimes_ndk_cxx", arch, "lldb-server") def get_tracer_pid(device, pid): if pid is None: return 0 line, _ = device.shell(["grep", "-e", "^TracerPid:", "/proc/{}/status".format(pid)]) tracer_pid = re.sub('TracerPid:\t(.*)\n', r'\1', line) return int(tracer_pid) def parse_args(): parser = gdbrunner.ArgumentParser() group = parser.add_argument_group(title="attach target") group = group.add_mutually_exclusive_group(required=True) group.add_argument( "-p", dest="target_pid", metavar="PID", type=int, help="attach to a process with specified PID") group.add_argument( "-n", dest="target_name", metavar="NAME", help="attach to a process with specified name") group.add_argument( "-r", dest="run_cmd", metavar="CMD", nargs=argparse.REMAINDER, help="run a binary on the device, with args") parser.add_argument( "--port", nargs="?", default="5039", help="override the port used on the host [default: 5039]") parser.add_argument( "--user", nargs="?", default="root", help="user to run commands as on the device [default: root]") parser.add_argument( "--setup-forwarding", default=None, choices=["lldb", "vscode-lldb"], help=("Set up lldb-server and port forwarding. Prints commands or " + ".vscode/launch.json configuration needed to connect the debugging " + "client to the server. 'vscode' with llbd and 'vscode-lldb' both " + "require the 'vadimcn.vscode-lldb' extension.")) parser.add_argument( "--env", nargs=1, action="append", metavar="VAR=VALUE", help="set environment variable when running a binary") parser.add_argument( "--chroot", nargs='?', default="", metavar="PATH", help="run command in a chroot in the given directory") return parser.parse_args() def verify_device(root, device): names = set([device.get_prop("ro.build.product"), device.get_prop("ro.product.name")]) target_device = os.environ["TARGET_PRODUCT"] if target_device not in names: msg = "TARGET_PRODUCT ({}) does not match attached device ({})" sys.exit(msg.format(target_device, ", ".join(names))) def get_remote_pid(device, process_name): processes = gdbrunner.get_processes(device) if process_name not in processes: msg = "failed to find running process {}".format(process_name) sys.exit(msg) pids = processes[process_name] if len(pids) > 1: msg = "multiple processes match '{}': {}".format(process_name, pids) sys.exit(msg) # Fetch the binary using the PID later. return pids[0] def make_temp_dir(prefix): global g_temp_dirs result = tempfile.mkdtemp(prefix='lldbclient-linker-') g_temp_dirs.append(result) return result def ensure_linker(device, sysroot, interp): """Ensure that the device's linker exists on the host. PT_INTERP is usually /system/bin/linker[64], but on the device, that file is a symlink to /apex/com.android.runtime/bin/linker[64]. The symbolized linker binary on the host is located in ${sysroot}/apex, not in ${sysroot}/system, so add the ${sysroot}/apex path to the solib search path. PT_INTERP will be /system/bin/bootstrap/linker[64] for executables using the non-APEX/bootstrap linker. No search path modification is needed. For a tapas build, only an unbundled app is built, and there is no linker in ${sysroot} at all, so copy the linker from the device. Returns: A directory to add to the soinfo search path or None if no directory needs to be added. """ # Static executables have no interpreter. if interp is None: return None # lldb will search for the linker using the PT_INTERP path. First try to find # it in the sysroot. local_path = os.path.join(sysroot, interp.lstrip("/")) if os.path.exists(local_path): return None # If the linker on the device is a symlink, search for the symlink's target # in the sysroot directory. interp_real, _ = device.shell(["realpath", interp]) interp_real = interp_real.strip() local_path = os.path.join(sysroot, interp_real.lstrip("/")) if os.path.exists(local_path): if posixpath.basename(interp) == posixpath.basename(interp_real): # Add the interpreter's directory to the search path. return os.path.dirname(local_path) else: # If PT_INTERP is linker_asan[64], but the sysroot file is # linker[64], then copy the local file to the name lldb expects. result = make_temp_dir('lldbclient-linker-') shutil.copy(local_path, os.path.join(result, posixpath.basename(interp))) return result # Pull the system linker. result = make_temp_dir('lldbclient-linker-') device.pull(interp, os.path.join(result, posixpath.basename(interp))) return result def handle_switches(args, sysroot): """Fetch the targeted binary and determine how to attach lldb. Args: args: Parsed arguments. sysroot: Local sysroot path. Returns: (binary_file, attach_pid, run_cmd). Precisely one of attach_pid or run_cmd will be None. """ device = args.device binary_file = None pid = None run_cmd = None args.su_cmd = ["su", args.user] if args.user else [] if args.target_pid: # Fetch the binary using the PID later. pid = args.target_pid elif args.target_name: # Fetch the binary using the PID later. pid = get_remote_pid(device, args.target_name) elif args.run_cmd: if not args.run_cmd[0]: sys.exit("empty command passed to -r") run_cmd = args.run_cmd if not run_cmd[0].startswith("/"): try: run_cmd[0] = gdbrunner.find_executable_path(device, args.run_cmd[0], run_as_cmd=args.su_cmd) except RuntimeError: sys.exit("Could not find executable '{}' passed to -r, " "please provide an absolute path.".format(args.run_cmd[0])) binary_file, local = gdbrunner.find_file(device, run_cmd[0], sysroot, run_as_cmd=args.su_cmd) if binary_file is None: assert pid is not None try: binary_file, local = gdbrunner.find_binary(device, pid, sysroot, run_as_cmd=args.su_cmd) except adb.ShellError: sys.exit("failed to pull binary for PID {}".format(pid)) if not local: logging.warning("Couldn't find local unstripped executable in {}," " symbols may not be available.".format(sysroot)) return (binary_file, pid, run_cmd) def generate_vscode_lldb_script(root, sysroot, binary_name, port, solib_search_path): # TODO It would be nice if we didn't need to copy this or run the # lldbclient.py program manually. Doing this would probably require # writing a vscode extension or modifying an existing one. # TODO: https://code.visualstudio.com/api/references/vscode-api#debug and # https://code.visualstudio.com/api/extension-guides/debugger-extension and # https://github.com/vadimcn/vscode-lldb/blob/6b775c439992b6615e92f4938ee4e211f1b060cf/extension/pickProcess.ts#L6 res = { "name": "(lldbclient.py) Attach {} (port: {})".format(binary_name.split("/")[-1], port), "type": "lldb", "request": "custom", "relativePathBase": root, "sourceMap": { "/b/f/w" : root, '': root, '.': root }, "initCommands": ['settings append target.exec-search-paths {}'.format(' '.join(solib_search_path))], "targetCreateCommands": ["target create {}".format(binary_name), "target modules search-paths add / {}/".format(sysroot)], "processCreateCommands": ["gdb-remote {}".format(str(port))] } return json.dumps(res, indent=4) def generate_lldb_script(root, sysroot, binary_name, port, solib_search_path): commands = [] commands.append( 'settings append target.exec-search-paths {}'.format(' '.join(solib_search_path))) commands.append('target create {}'.format(binary_name)) # For RBE support. commands.append("settings append target.source-map '/b/f/w' '{}'".format(root)) commands.append("settings append target.source-map '' '{}'".format(root)) commands.append('target modules search-paths add / {}/'.format(sysroot)) commands.append('gdb-remote {}'.format(str(port))) return '\n'.join(commands) def generate_setup_script(debugger_path, sysroot, linker_search_dir, binary_file, is64bit, port, debugger, connect_timeout=5): # Generate a setup script. root = os.environ["ANDROID_BUILD_TOP"] symbols_dir = os.path.join(sysroot, "system", "lib64" if is64bit else "lib") vendor_dir = os.path.join(sysroot, "vendor", "lib64" if is64bit else "lib") solib_search_path = [] symbols_paths = ["", "hw", "ssl/engines", "drm", "egl", "soundfx"] vendor_paths = ["", "hw", "egl"] solib_search_path += [os.path.join(symbols_dir, x) for x in symbols_paths] solib_search_path += [os.path.join(vendor_dir, x) for x in vendor_paths] if linker_search_dir is not None: solib_search_path += [linker_search_dir] if debugger == "vscode-lldb": return generate_vscode_lldb_script( root, sysroot, binary_file.name, port, solib_search_path) elif debugger == 'lldb': return generate_lldb_script( root, sysroot, binary_file.name, port, solib_search_path) else: raise Exception("Unknown debugger type " + debugger) def do_main(): required_env = ["ANDROID_BUILD_TOP", "ANDROID_PRODUCT_OUT", "TARGET_PRODUCT"] for env in required_env: if env not in os.environ: sys.exit( "Environment variable '{}' not defined, have you run lunch?".format(env)) args = parse_args() device = args.device if device is None: sys.exit("ERROR: Failed to find device.") root = os.environ["ANDROID_BUILD_TOP"] sysroot = os.path.join(os.environ["ANDROID_PRODUCT_OUT"], "symbols") # Make sure the environment matches the attached device. # Skip when running in a chroot because the chroot lunch target may not # match the device's lunch target. if not args.chroot: verify_device(root, device) debug_socket = "/data/local/tmp/debug_socket" pid = None run_cmd = None # Fetch binary for -p, -n. binary_file, pid, run_cmd = handle_switches(args, sysroot) with binary_file: if sys.platform.startswith("linux"): platform_name = "linux-x86" elif sys.platform.startswith("darwin"): platform_name = "darwin-x86" else: sys.exit("Unknown platform: {}".format(sys.platform)) arch = gdbrunner.get_binary_arch(binary_file) is64bit = arch.endswith("64") # Make sure we have the linker clang_base = 'prebuilts/clang/host' clang_version = read_toolchain_config(root) toolchain_path = os.path.join(root, clang_base, platform_name, clang_version) llvm_readobj_path = os.path.join(toolchain_path, "bin", "llvm-readobj") interp = gdbrunner.get_binary_interp(binary_file.name, llvm_readobj_path) linker_search_dir = ensure_linker(device, sysroot, interp) tracer_pid = get_tracer_pid(device, pid) if tracer_pid == 0: cmd_prefix = args.su_cmd if args.env: cmd_prefix += ['env'] + [v[0] for v in args.env] # Start lldb-server. server_local_path = get_lldb_server_path(root, clang_base, clang_version, arch) server_remote_path = "/data/local/tmp/{}-lldb-server".format(arch) gdbrunner.start_gdbserver( device, server_local_path, server_remote_path, target_pid=pid, run_cmd=run_cmd, debug_socket=debug_socket, port=args.port, run_as_cmd=cmd_prefix, lldb=True, chroot=args.chroot) else: print( "Connecting to tracing pid {} using local port {}".format( tracer_pid, args.port)) gdbrunner.forward_gdbserver_port(device, local=args.port, remote="tcp:{}".format(args.port)) debugger_path = get_lldb_path(toolchain_path) debugger = args.setup_forwarding or 'lldb' # Generate the lldb script. setup_commands = generate_setup_script(debugger_path=debugger_path, sysroot=sysroot, linker_search_dir=linker_search_dir, binary_file=binary_file, is64bit=is64bit, port=args.port, debugger=debugger) if not args.setup_forwarding: # Print a newline to separate our messages from the GDB session. print("") # Start lldb. gdbrunner.start_gdb(debugger_path, setup_commands, lldb=True) else: print("") print(setup_commands) print("") if args.setup_forwarding == "vscode-lldb": print(textwrap.dedent(""" Paste the above json into .vscode/launch.json and start the debugger as normal. Press enter in this terminal once debugging is finished to shut lldb-server down and close all the ports.""")) else: print(textwrap.dedent(""" Paste the lldb commands above into the lldb frontend to set up the lldb-server connection. Press enter in this terminal once debugging is finished to shut lldb-server down and close all the ports.""")) print("") input("Press enter to shut down lldb-server") def main(): try: do_main() finally: global g_temp_dirs for temp_dir in g_temp_dirs: shutil.rmtree(temp_dir) if __name__ == "__main__": main()