next_el = elt.__getattr__(field_name).le_next
elt = cast(next_el, element_type)
-def IterateQueue(queue_head, element_ptr_type, element_field_name):
- """ iterate over a queue in kernel of type queue_head_t. refer to osfmk/kern/queue.h
+def IterateLinkageChain(queue_head, element_type, field_name, field_ofst=0):
+ """ Iterate over a Linkage Chain queue in kernel of type queue_head_t. (osfmk/kern/queue.h method 1)
+ This is equivalent to the qe_foreach_element() macro
+ params:
+ queue_head - value : Value object for queue_head.
+ element_type - lldb.SBType : pointer type of the element which contains the queue_chain_t. Typically its structs like thread, task etc..
+ - str : OR a string describing the type. ex. 'task *'
+ field_name - str : Name of the field (in element) which holds a queue_chain_t
+ field_ofst - int : offset from the 'field_name' (in element) which holds a queue_chain_t
+ This is mostly useful if a particular element contains an array of queue_chain_t
+ returns:
+ A generator does not return. It is used for iterating.
+ value : An object thats of type (element_type). Always a pointer object
+ example usage:
+ coalq = kern.GetGlobalVariable('coalitions_q')
+ for coal in IterateLinkageChain(coalq, 'struct coalition *', 'coalitions'):
+ print GetCoalitionInfo(coal)
+ """
+ global kern
+ if type(element_type) == str:
+ element_type = gettype(element_type)
+
+ if unsigned(queue_head) == 0:
+ return
+
+ if element_type.IsPointerType():
+ elem_ofst = getfieldoffset(element_type.GetPointeeType(), field_name) + field_ofst
+ else:
+ elem_ofst = getfieldoffset(element_type, field_name) + field_ofst
+
+ link = queue_head.next
+ while (unsigned(link) != unsigned(queue_head)):
+ addr = unsigned(link) - elem_ofst;
+ # I can't use the GetValueFromAddress function of the kernel class
+ # because I have no instance of that class!
+ obj = value(link.GetSBValue().CreateValueFromExpression(None,'(void *)'+str(addr)))
+ obj = cast(obj, element_type)
+ yield obj
+ link = link.next
+
+
+def IterateQueue(queue_head, element_ptr_type, element_field_name, backwards=False, unpack_ptr_fn=None):
+ """ Iterate over an Element Chain queue in kernel of type queue_head_t. (osfmk/kern/queue.h method 2)
params:
queue_head - value : Value object for queue_head.
- element_ptr_type - lldb.SBType : a pointer type of the element 'next' points to. Typically its structs like thread, task etc..
+ element_ptr_type - lldb.SBType : a pointer type of the element 'next' points to. Typically its structs like thread, task etc..
- str : OR a string describing the type. ex. 'task *'
element_field_name - str : name of the field in target struct.
+ backwards - backwards : traverse the queue backwards
+ unpack_ptr_fn - function : a function ptr of signature def unpack_ptr(long v) which returns long.
returns:
A generator does not return. It is used for iterating.
value : an object thats of type (element_type) queue_head->next. Always a pointer object
queue_head_addr = queue_head.GetValueAsUnsigned()
else:
queue_head_addr = queue_head.GetAddress().GetLoadAddress(LazyTarget.GetTarget())
- cur_elt = queue_head.GetChildMemberWithName('next')
+
+ def unpack_ptr_and_recast(v):
+ if unpack_ptr_fn is None:
+ return v
+ v_unpacked = unpack_ptr_fn(v.GetValueAsUnsigned())
+ obj = v.CreateValueFromExpression(None,'(void *)'+str(v_unpacked))
+ obj.Cast(element_ptr_type)
+ return obj
+
+ if backwards:
+ cur_elt = unpack_ptr_and_recast(queue_head.GetChildMemberWithName('prev'))
+ else:
+ cur_elt = unpack_ptr_and_recast(queue_head.GetChildMemberWithName('next'))
+
while True:
if not cur_elt.IsValid() or cur_elt.GetValueAsUnsigned() == 0 or cur_elt.GetValueAsUnsigned() == queue_head_addr:
break
elt = cur_elt.Cast(element_ptr_type)
yield value(elt)
- cur_elt = elt.GetChildMemberWithName(element_field_name).GetChildMemberWithName('next')
-
+ if backwards:
+ cur_elt = unpack_ptr_and_recast(elt.GetChildMemberWithName(element_field_name).GetChildMemberWithName('prev'))
+ else:
+ cur_elt = unpack_ptr_and_recast(elt.GetChildMemberWithName(element_field_name).GetChildMemberWithName('next'))
class KernelTarget(object):
def __getattr__(self, name):
v = self._xnu_kernobj_12obscure12.GetGlobalVariable(name)
if not v.GetSBValue().IsValid():
- raise ValueError('no such global variable by name: %s '%str(name))
+ raise ValueError('No such global variable by name: %s '%str(name))
return v
self.globals = _GlobalVariableFind(self)
LazyTarget.Initialize(debugger)
returns: value - python object representing global variable.
raises : Exception in case the variable is not found.
"""
- return value(LazyTarget.GetTarget().FindGlobalVariables(name, 0).GetValueAtIndex(0))
+ self._globals_cache_dict = caching.GetDynamicCacheData("kern._globals_cache_dict", {})
+ if name not in self._globals_cache_dict:
+ self._globals_cache_dict[name] = value(LazyTarget.GetTarget().FindGlobalVariables(name, 1).GetValueAtIndex(0))
+ return self._globals_cache_dict[name]
def GetLoadAddressForSymbol(self, name):
""" Get the load address of a symbol in the kernel.
else:
raise ValueError("PhysToVirt does not support {0}".format(arch))
+ def GetNanotimeFromAbstime(self, abstime):
+ """ convert absolute time (which is in MATUs) to nano seconds.
+ Since based on architecture the conversion may differ.
+ params:
+ abstime - int absolute time as shown by mach_absolute_time
+ returns:
+ int - nanosecs of time
+ """
+ usec_divisor = caching.GetStaticCacheData("kern.rtc_usec_divisor", None)
+ if not usec_divisor:
+ if self.arch == 'x86_64':
+ usec_divisor = 1000
+ else:
+ rtclockdata_addr = self.GetLoadAddressForSymbol('RTClockData')
+ rtc = self.GetValueFromAddress(rtclockdata_addr, 'struct _rtclock_data_ *')
+ usec_divisor = unsigned(rtc.rtc_usec_divisor)
+ usec_divisor = int(usec_divisor)
+ caching.SaveStaticCacheData('kern.rtc_usec_divisor', usec_divisor)
+ nsecs = (abstime * 1000)/usec_divisor
+ return nsecs
+
def __getattribute__(self, name):
if name == 'zones' :
self._zones_list = caching.GetDynamicCacheData("kern._zones_list", [])
if len(self._zones_list) > 0: return self._zones_list
- first_zone = self.GetGlobalVariable('first_zone')
- for z in IterateLinkedList(first_zone, 'next_zone'):
- self._zones_list.append(z)
+ zone_array = self.GetGlobalVariable('zone_array')
+ for i in range(0, self.GetGlobalVariable('num_zones')):
+ self._zones_list.append(addressof(zone_array[i]))
caching.SaveDynamicCacheData("kern._zones_list", self._zones_list)
return self._zones_list
if name == 'coalitions' :
self._coalitions_list = caching.GetDynamicCacheData("kern._coalitions_list", [])
if len(self._coalitions_list) > 0 : return self._coalitions_list
- coalition_queue_head = self.GetGlobalVariable('coalitions')
+ coalition_queue_head = self.GetGlobalVariable('coalitions_q')
coalition_type = LazyTarget.GetTarget().FindFirstType('coalition')
coalition_ptr_type = coalition_type.GetPointerType()
- for tsk in IterateQueue(coalition_queue_head, coalition_ptr_type, 'coalitions'):
- self._coalitions_list.append(tsk)
+ for coal in IterateLinkageChain(addressof(coalition_queue_head), coalition_ptr_type, 'coalitions'):
+ self._coalitions_list.append(coal)
caching.SaveDynamicCacheData("kern._coalitions_list", self._coalitions_list)
return self._coalitions_list
return self._ptrsize
return object.__getattribute__(self, name)
-
projects / apple / xnu.git / blobdiff