157 lines
4.2 KiB
Python
157 lines
4.2 KiB
Python
#
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# gdb helper commands and functions for Linux kernel debugging
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#
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# common utilities
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#
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# Copyright (c) Siemens AG, 2011-2013
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#
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# Authors:
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# Jan Kiszka <jan.kiszka@siemens.com>
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#
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# This work is licensed under the terms of the GNU GPL version 2.
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#
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import gdb
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class CachedType:
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def __init__(self, name):
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self._type = None
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self._name = name
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def _new_objfile_handler(self, event):
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self._type = None
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gdb.events.new_objfile.disconnect(self._new_objfile_handler)
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def get_type(self):
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if self._type is None:
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self._type = gdb.lookup_type(self._name)
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if self._type is None:
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raise gdb.GdbError(
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"cannot resolve type '{0}'".format(self._name))
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if hasattr(gdb, 'events') and hasattr(gdb.events, 'new_objfile'):
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gdb.events.new_objfile.connect(self._new_objfile_handler)
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return self._type
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long_type = CachedType("long")
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def get_long_type():
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global long_type
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return long_type.get_type()
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def offset_of(typeobj, field):
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element = gdb.Value(0).cast(typeobj)
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return int(str(element[field].address).split()[0], 16)
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def container_of(ptr, typeobj, member):
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return (ptr.cast(get_long_type()) -
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offset_of(typeobj, member)).cast(typeobj)
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class ContainerOf(gdb.Function):
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"""Return pointer to containing data structure.
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$container_of(PTR, "TYPE", "ELEMENT"): Given PTR, return a pointer to the
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data structure of the type TYPE in which PTR is the address of ELEMENT.
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Note that TYPE and ELEMENT have to be quoted as strings."""
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def __init__(self):
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super(ContainerOf, self).__init__("container_of")
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def invoke(self, ptr, typename, elementname):
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return container_of(ptr, gdb.lookup_type(typename.string()).pointer(),
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elementname.string())
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ContainerOf()
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BIG_ENDIAN = 0
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LITTLE_ENDIAN = 1
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target_endianness = None
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def get_target_endianness():
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global target_endianness
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if target_endianness is None:
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endian = gdb.execute("show endian", to_string=True)
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if "little endian" in endian:
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target_endianness = LITTLE_ENDIAN
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elif "big endian" in endian:
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target_endianness = BIG_ENDIAN
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else:
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raise gdb.GdgError("unknown endianness '{0}'".format(str(endian)))
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return target_endianness
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def read_u16(buffer):
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if get_target_endianness() == LITTLE_ENDIAN:
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return ord(buffer[0]) + (ord(buffer[1]) << 8)
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else:
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return ord(buffer[1]) + (ord(buffer[0]) << 8)
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def read_u32(buffer):
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if get_target_endianness() == LITTLE_ENDIAN:
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return read_u16(buffer[0:2]) + (read_u16(buffer[2:4]) << 16)
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else:
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return read_u16(buffer[2:4]) + (read_u16(buffer[0:2]) << 16)
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def read_u64(buffer):
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if get_target_endianness() == LITTLE_ENDIAN:
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return read_u32(buffer[0:4]) + (read_u32(buffer[4:8]) << 32)
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else:
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return read_u32(buffer[4:8]) + (read_u32(buffer[0:4]) << 32)
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target_arch = None
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def is_target_arch(arch):
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if hasattr(gdb.Frame, 'architecture'):
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return arch in gdb.newest_frame().architecture().name()
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else:
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global target_arch
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if target_arch is None:
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target_arch = gdb.execute("show architecture", to_string=True)
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return arch in target_arch
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GDBSERVER_QEMU = 0
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GDBSERVER_KGDB = 1
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gdbserver_type = None
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def get_gdbserver_type():
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def exit_handler(event):
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global gdbserver_type
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gdbserver_type = None
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gdb.events.exited.disconnect(exit_handler)
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def probe_qemu():
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try:
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return gdb.execute("monitor info version", to_string=True) != ""
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except:
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return False
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def probe_kgdb():
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try:
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thread_info = gdb.execute("info thread 2", to_string=True)
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return "shadowCPU0" in thread_info
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except:
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return False
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global gdbserver_type
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if gdbserver_type is None:
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if probe_qemu():
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gdbserver_type = GDBSERVER_QEMU
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elif probe_kgdb():
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gdbserver_type = GDBSERVER_KGDB
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if not gdbserver_type is None and hasattr(gdb, 'events'):
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gdb.events.exited.connect(exit_handler)
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return gdbserver_type
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