X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/fe8ab488e9161c46dd9885d58fc52996dc0249ff..d190cdc3f5544636abb56dc1874be391d3e1b148:/tools/lldbmacros/core/kernelcore.py diff --git a/tools/lldbmacros/core/kernelcore.py b/tools/lldbmacros/core/kernelcore.py index 26a4dcf7a..3c6e5802b 100644 --- a/tools/lldbmacros/core/kernelcore.py +++ b/tools/lldbmacros/core/kernelcore.py @@ -68,13 +68,56 @@ def IterateListEntry(element, element_type, field_name): 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 @@ -91,15 +134,30 @@ def IterateQueue(queue_head, element_ptr_type, element_field_name): 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): @@ -130,7 +188,7 @@ 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) @@ -202,7 +260,10 @@ class KernelTarget(object): 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. @@ -283,13 +344,34 @@ class KernelTarget(object): 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 @@ -318,11 +400,11 @@ class KernelTarget(object): 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 @@ -400,4 +482,3 @@ class KernelTarget(object): return self._ptrsize return object.__getattribute__(self, name) -