tools/lldbmacros/core/xnu_lldb_init.py

   1 import os
   2 import re
   3
   4 def GetSettingsValues(debugger, setting_variable_name):
   5     """ Queries the lldb internal settings
   6         params:
   7             debugger : lldb.SBDebugger instance
   8             setting_variable_name: str - string name of the setting(eg prompt)
   9         returns:
  10             [] : Array of strings. Empty array if setting is not found/set
  11     """
  12     retval = []
  13     settings_val_list = debugger.GetInternalVariableValue(setting_variable_name, debugger.GetInstanceName())
  14     for s in settings_val_list:
  15         retval.append(str(s))
  16     return retval
  17
  18 def GetSymbolsFilePathFromModule(m):
  19     """ Get a file path from a module.
  20         params: m - lldb.target.module
  21         returns:
  22             str : path to first file based symbol. Note this might be dir path inside sources.
  23     """
  24     for s in m.symbols:
  25         if s.type == 8:
  26             return os.path.dirname(str(s.name))
  27     return ""
  28
  29 def GetSourcePathSettings(binary_path, symbols_path):
  30     """ Parse the binary path and symbols_path to find if source-map setting is applicable
  31         params:
  32             binary_path: str path of the kernel module
  33             symbols_path: str path of the symbols stored in binary. Use
  34         returns:
  35             str : string command to set the source-map setting.
  36     """
  37     retval = ""
  38     train_re = re.compile(r"dsyms/([a-zA-Z]+)/")
  39     _t_arr = train_re.findall(binary_path)
  40     train = ''
  41     if _t_arr:
  42         train = _t_arr[0]
  43     if not train:
  44         return retval
  45     new_path = "~rc/Software/{}/Projects/".format(train)
  46     new_path = os.path.expanduser(new_path)
  47     new_path = os.path.normpath(new_path)
  48     common_path_re = re.compile("(^.*?Sources/)(xnu.*?)/.*$")
  49     _t_arr = common_path_re.findall(symbols_path)
  50     srcpath = ""
  51     projpath = "xnu"
  52     if _t_arr:
  53         srcpath = "".join(_t_arr[0])
  54         projpath = _t_arr[0][-1]
  55     else:
  56         return retval
  57
  58     new_path = new_path + os.path.sep +  projpath
  59     cmd = "settings append target.source-map {} {}"
  60     retval =  cmd.format(srcpath, new_path)
  61     return retval
  62
  63
  64 def __lldb_init_module(debugger, internal_dict):
  65     debug_session_enabled = False
  66     if "DEBUG_XNU_LLDBMACROS" in os.environ and len(os.environ['DEBUG_XNU_LLDBMACROS']) > 0:
  67         debug_session_enabled = True
  68     prev_os_plugin = "".join(GetSettingsValues(debugger, 'target.process.python-os-plugin-path'))
  69     print "Loading kernel debugging from %s" % __file__
  70     print "LLDB version %s" % debugger.GetVersionString()
  71     self_path = str(__file__)
  72     base_dir_name = self_path[:self_path.rfind("/")]
  73     core_os_plugin = base_dir_name + "/lldbmacros/core/operating_system.py"
  74     osplugin_cmd = "settings set target.process.python-os-plugin-path \"%s\"" % core_os_plugin
  75     intel_whitelist = ['hndl_allintrs', 'hndl_alltraps', 'trap_from_kernel', 'hndl_double_fault', 'hndl_machine_check']
  76     arm_whitelist = ['_fleh_prefabt', '_ExceptionVectorsBase', '_ExceptionVectorsTable', '_fleh_undef', '_fleh_dataabt', '_fleh_irq', '_fleh_decirq', '_fleh_fiq_generic', '_fleh_dec']
  77     whitelist_trap_cmd = "settings set target.trap-handler-names %s %s" % (' '.join(intel_whitelist), ' '.join(arm_whitelist))
  78     xnu_debug_path = base_dir_name + "/lldbmacros/xnu.py"
  79     xnu_load_cmd = "command script import \"%s\"" % xnu_debug_path
  80     disable_optimization_warnings_cmd = "settings set target.process.optimization-warnings false"
  81
  82     source_map_cmd = ""
  83     try:
  84         source_map_cmd = GetSourcePathSettings(base_dir_name, GetSymbolsFilePathFromModule(debugger.GetTargetAtIndex(0).modules[0]) )
  85     except Exception as e:
  86         pass
  87     if debug_session_enabled :
  88         if len(prev_os_plugin) > 0:
  89             print "\nDEBUG_XNU_LLDBMACROS is set. Skipping the setting of OS plugin from dSYM.\nYou can manually set the OS plugin by running\n" + osplugin_cmd
  90         else:
  91             print osplugin_cmd
  92             debugger.HandleCommand(osplugin_cmd)
  93         print "\nDEBUG_XNU_LLDBMACROS is set. Skipping the load of xnu debug framework.\nYou can manually load the framework by running\n" + xnu_load_cmd
  94     else:
  95         print osplugin_cmd
  96         debugger.HandleCommand(osplugin_cmd)
  97         print whitelist_trap_cmd
  98         debugger.HandleCommand(whitelist_trap_cmd)
  99         print xnu_load_cmd
 100         debugger.HandleCommand(xnu_load_cmd)
 101         print disable_optimization_warnings_cmd
 102         debugger.HandleCommand(disable_optimization_warnings_cmd)
 103         if source_map_cmd:
 104             print source_map_cmd
 105             debugger.HandleCommand(source_map_cmd)
 106     print "\n"
 107