def setup_slab_caches(slab_caches: gdb.Symbol) -> None:
list_caches = slab_caches.value()
for cache in list_for_each_entry(list_caches, types.kmem_cache_type,
KmemCache.head_name):
name = cache["name"].string()
kmem_cache = KmemCache(name, cache)
kmem_caches[name] = kmem_cache
kmem_caches_by_addr[int(cache.address)] = kmem_cache
def setup_xen_m2p(cls, symbol: gdb.Symbol) -> None:
xen_domain_type = int(symbol.value())
# XXX: this is quite lazy...
if xen_domain_type == 0:
return
cls.machine_to_phys_nr = int(get_symbol_value("machine_to_phys_nr"))
cls.xen_max_p2m_pfn = int(get_symbol_value("xen_max_p2m_pfn"))
cls.xen_p2m_addr = get_symbol_value("xen_p2m_addr")
cls.xen_m2p_needed = True
def check_task_interface(cls, init_task: gdb.Symbol) -> None:
"""
Check which interface to iterating over mount structures is in use
Meant to be used as a SymbolCallback.
Args:
init_task: The ``init_task`` symbol.
"""
cls._init_fs_root = init_task.value()['fs']['root']
if struct_has_member(init_task, 'nsproxy'):
cls._for_each_mount = cls._for_each_mount_nsproxy
else:
raise NotImplementedError("Mount.for_each_mount is unhandled on this kernel version")
def setup_possible_mask(cls, cpu_mask: gdb.Symbol) -> None:
"""
Translate the ``cpu_possible_mask`` bitmap into a list of
possible CPU numbers.
Meant to be used as a SymbolCallback.
Args:
cpu_mask: The symbol for ``cpu_possible_mask`` or
``__cpu_possible_mask``, depending on kernel version.
"""
cls._cpu_possible_mask = cpu_mask.value()
bits = cls._cpu_possible_mask["bits"]
cls.cpus_possible = list(for_each_set_bit(bits))
def _setup_flag_names(symbol: gdb.Symbol) -> None:
global gfpflag_names, pageflag_names
flag_names = list()
array = symbol.value()
i = 0
val = array[0]
while val["mask"] != 0 and val["name"] != 0:
flag_names.append((int(val["mask"]), str(val["name"].string())))
i += 1
val = array[i]
if symbol.name == "gfpflag_names":
gfpflag_names = flag_names
elif symbol.name == "pageflag_names":
pageflag_names = flag_names
else:
raise RuntimeError("unknown symbol passed")
def setup_node_states(cls, node_states_sym: gdb.Symbol) -> None:
"""
Detect names of node states and which nodes are possible
and online.
Meant to be used as a SymbolCallback.
Args:
node_states_sym: The ``node_states`` symbol.
"""
node_states = node_states_sym.value()
enum_node_states = gdb.lookup_type("enum node_states")
N_POSSIBLE = enum_node_states["N_POSSIBLE"].enumval
N_ONLINE = enum_node_states["N_ONLINE"].enumval
bits = node_states[N_POSSIBLE]["bits"]
cls.nids_possible = list(for_each_set_bit(bits))
bits = node_states[N_ONLINE]["bits"]
cls.nids_online = list(for_each_set_bit(bits))
def setup_directmap_base(cls, symbol: gdb.Symbol) -> None:
cls.directmap_base = int(symbol.value())
def setup_vmemmap_base(cls, symbol: gdb.Symbol) -> None:
cls.vmemmap_base = int(symbol.value())
# setup_page_type() was first and used the hardcoded initial value,
# we have to update
cls.vmemmap = gdb.Value(cls.vmemmap_base).cast(
types.page_type.pointer())
def task_state_flags_callback(cls, symbol: gdb.Symbol) -> None:
# pylint: disable=unused-argument
"""
Detect which task flags this kernel uses.
Meant to be used as a SymbolCallback.
Different kernels use different task flags or even different values
for the same flags. This method tries to determine the flags for
the kernel.
Args:
symbol: The ``task_state_array`` symbol.
"""
task_state_array = symbol.value()
count = array_size(task_state_array)
bit = 0
for i in range(count):
state = task_state_array[i].string()
state_strings = {
'(running)' : 'TASK_RUNNING',
'(sleeping)' : 'TASK_INTERRUPTIBLE',
'(disk sleep)' : 'TASK_UNINTERRUPTIBLE',
'(stopped)' : 'TASK_STOPPED',
'(zombie)' : 'EXIT_ZOMBIE',
'x (dead)' : 'TASK_DEAD',
'X (dead)' : 'EXIT_DEAD',
'(swapping)' : 'TASK_SWAPPING',
'(tracing stop)' : 'TASK_TRACING_STOPPED',
'(wakekill)' : 'TASK_WAKEKILL',
'(waking)' : 'TASK_WAKING',
'(parked)' : 'TASK_PARKED',
'(idle)' : '__TASK_IDLE',
}
for key in state_strings:
if key in state:
setattr(cls, state_strings[key], bit)
if bit == 0:
bit = 1
else:
bit <<= 1
# Linux 4.14 re-introduced TASK_PARKED into task_state_array
# which renumbered some bits
if cls.has_flag('TASK_PARKED') and not cls.has_flag('TASK_DEAD'):
newbits = cls.TASK_PARKED << 1
cls.TASK_DEAD = newbits
cls.TASK_WAKEKILL = newbits << 1
cls.TASK_WAKING = newbits << 2
cls.TASK_NOLOAD = newbits << 3
cls.TASK_NEW = newbits << 4
assert cls.TASK_PARKED == 0x0040
assert cls.TASK_DEAD == 0x0080
assert cls.TASK_WAKEKILL == 0x0100
assert cls.TASK_WAKING == 0x0200
# Linux 3.14 removed several elements from task_state_array
# so we'll have to make some assumptions.
# TASK_NOLOAD wasn't introduced until 4.2 and wasn't added
# to task_state_array until v4.14. There's no way to
# detect whether the use of the flag is valid for a particular
# kernel release.
elif cls.has_flag('EXIT_DEAD'):
if cls.EXIT_ZOMBIE > cls.EXIT_DEAD:
newbits = cls.EXIT_ZOMBIE << 1
else:
newbits = cls.EXIT_DEAD << 1
cls.TASK_DEAD = newbits
cls.TASK_WAKEKILL = newbits << 1
cls.TASK_WAKING = newbits << 2
cls.TASK_PARKED = newbits << 3
cls.TASK_NOLOAD = newbits << 4
cls.TASK_NEW = newbits << 5
assert cls.TASK_DEAD == 0x0040
assert cls.TASK_WAKEKILL == 0x0080
assert cls.TASK_WAKING == 0x0100
assert cls.TASK_PARKED == 0x0200
else:
assert cls.TASK_DEAD == 64
assert cls.TASK_WAKEKILL == 128
assert cls.TASK_WAKING == 256
assert cls.TASK_PARKED == 512
if cls.has_flag('TASK_NOLOAD'):
assert cls.TASK_NOLOAD == 1024
cls.TASK_IDLE = cls.TASK_NOLOAD | cls.TASK_UNINTERRUPTIBLE
assert cls.TASK_IDLE == 1026
if cls.has_flag('TASK_NEW'):
assert cls.TASK_NEW == 2048
cls._check_state_bits()
def callback(self, value: gdb.Symbol) -> None:
symval = value.value()
if symval.type.code == gdb.TYPE_CODE_FUNC:
symval = symval.address
self.value = symval