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Diffstat (limited to 'scripts/gdb/linux/modules.py')
-rw-r--r-- | scripts/gdb/linux/modules.py | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/scripts/gdb/linux/modules.py b/scripts/gdb/linux/modules.py new file mode 100644 index 000000000..298dfcc25 --- /dev/null +++ b/scripts/gdb/linux/modules.py @@ -0,0 +1,131 @@ +# +# gdb helper commands and functions for Linux kernel debugging +# +# module tools +# +# Copyright (c) Siemens AG, 2013 +# +# Authors: +# Jan Kiszka <jan.kiszka@siemens.com> +# +# This work is licensed under the terms of the GNU GPL version 2. +# + +import gdb + +from linux import cpus, utils, lists, constants + + +module_type = utils.CachedType("struct module") + + +def module_list(): + global module_type + modules = utils.gdb_eval_or_none("modules") + if modules is None: + return + + module_ptr_type = module_type.get_type().pointer() + + for module in lists.list_for_each_entry(modules, module_ptr_type, "list"): + yield module + + +def find_module_by_name(name): + for module in module_list(): + if module['name'].string() == name: + return module + return None + + +class LxModule(gdb.Function): + """Find module by name and return the module variable. + +$lx_module("MODULE"): Given the name MODULE, iterate over all loaded modules +of the target and return that module variable which MODULE matches.""" + + def __init__(self): + super(LxModule, self).__init__("lx_module") + + def invoke(self, mod_name): + mod_name = mod_name.string() + module = find_module_by_name(mod_name) + if module: + return module.dereference() + else: + raise gdb.GdbError("Unable to find MODULE " + mod_name) + + +LxModule() + + +class LxLsmod(gdb.Command): + """List currently loaded modules.""" + + _module_use_type = utils.CachedType("struct module_use") + + def __init__(self): + super(LxLsmod, self).__init__("lx-lsmod", gdb.COMMAND_DATA) + + def invoke(self, arg, from_tty): + gdb.write( + "Address{0} Module Size Used by\n".format( + " " if utils.get_long_type().sizeof == 8 else "")) + + for module in module_list(): + text = module['mem'][constants.LX_MOD_TEXT] + text_addr = str(text['base']).split()[0] + total_size = 0 + + for i in range(constants.LX_MOD_TEXT, constants.LX_MOD_RO_AFTER_INIT + 1): + total_size += module['mem'][i]['size'] + + gdb.write("{address} {name:<19} {size:>8} {ref}".format( + address=text_addr, + name=module['name'].string(), + size=str(total_size), + ref=str(module['refcnt']['counter'] - 1))) + + t = self._module_use_type.get_type().pointer() + first = True + sources = module['source_list'] + for use in lists.list_for_each_entry(sources, t, "source_list"): + gdb.write("{separator}{name}".format( + separator=" " if first else ",", + name=use['source']['name'].string())) + first = False + + gdb.write("\n") + +LxLsmod() + +def help(): + t = """Usage: lx-getmod-by-textaddr [Heximal Address] + Example: lx-getmod-by-textaddr 0xffff800002d305ac\n""" + gdb.write("Unrecognized command\n") + raise gdb.GdbError(t) + +class LxFindTextAddrinMod(gdb.Command): + '''Look up loaded kernel module by text address.''' + + def __init__(self): + super(LxFindTextAddrinMod, self).__init__('lx-getmod-by-textaddr', gdb.COMMAND_SUPPORT) + + def invoke(self, arg, from_tty): + args = gdb.string_to_argv(arg) + + if len(args) != 1: + help() + + addr = gdb.Value(int(args[0], 16)).cast(utils.get_ulong_type()) + for mod in module_list(): + mod_text_start = mod['mem'][constants.LX_MOD_TEXT]['base'] + mod_text_end = mod_text_start + mod['mem'][constants.LX_MOD_TEXT]['size'].cast(utils.get_ulong_type()) + + if addr >= mod_text_start and addr < mod_text_end: + s = "0x%x" % addr + " is in " + mod['name'].string() + ".ko\n" + gdb.write(s) + return + gdb.write("0x%x is not in any module text section\n" % addr) + +LxFindTextAddrinMod() |