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source: tools/gdb/utils-gdb.py @ 63d1ebe

ADTast-experimental

Last change on this file since 63d1ebe was 2e94d94f, checked in by Thierry Delisle <tdelisle@…>, 2 years ago
Fixed a few bugs in the processor listing.
Property mode set to `100644`
File size: 18.4 KB

Rev	Line
[1cfdee9]	1	#
	2	# Copyright (C) Lynn Tran, Jiachen Zhang 2018
	3	#
	4	# utils-gdb.py --
	5	#
	6	# Author : Lynn Tran
	7	# Created On : Mon Oct 1 22:06:09 2018
	8	# Last Modified By : Peter A. Buhr
	9	# Last Modified On : Sat Jan 19 14:16:10 2019
	10	# Update Count : 11
	11	#
	12
	13	"""
	14	To run this extension, the python name has to be as same as one of the loaded library
	15	Additionally, the file must exist in a folder which is in gdb's safe path
	16	"""
	17	import collections
	18	import gdb
	19	import re
	20
	21	# set these signal handlers with some settings (nostop, noprint, pass)
	22	gdb.execute('handle SIGALRM nostop noprint pass')
	23	gdb.execute('handle SIGUSR1 nostop noprint pass')
	24
[6abcb4d]	25	CfaTypes = collections.namedtuple('CfaTypes', 'cluster_ptr processor_ptr thread_ptr int_ptr thread_state yield_state')
[1cfdee9]	26
[96df7c9c]	27	class ThreadInfo:
[9987d79]	28	tid = 0
	29	cluster = None
	30	value = None
[1cfdee9]	31
[9987d79]	32	def __init__(self, cluster, value):
	33	self.cluster = cluster
	34	self.value = value
[1cfdee9]	35
[9987d79]	36	def is_system(self):
	37	return False
[1cfdee9]	38
	39	# A named tuple representing information about a stack
	40	StackInfo = collections.namedtuple('StackInfo', 'sp fp pc')
	41
	42	# A global variable to keep track of stack information as one switches from one
	43	# task to another task
	44	STACK = []
	45
	46	not_supported_error_msg = "Not a supported command for this language"
	47
	48	def is_cforall():
[9987d79]	49	return True
[1cfdee9]	50
	51	def get_cfa_types():
[9987d79]	52	# GDB types for various structures/types in CFA
	53	return CfaTypes(cluster_ptr = gdb.lookup_type('struct cluster').pointer(),
[6abcb4d]	54	processor_ptr = gdb.lookup_type('struct processor').pointer(),
[b7d94ac5]	55	thread_ptr = gdb.lookup_type('struct thread$').pointer(),
[6abcb4d]	56	int_ptr = gdb.lookup_type('int').pointer(),
	57	thread_state = gdb.lookup_type('enum __Coroutine_State'),
	58	yield_state = gdb.lookup_type('enum __Preemption_Reason'))
[1cfdee9]	59
	60	def get_addr(addr):
[9987d79]	61	"""
	62	NOTE: sketchy solution to retrieve address. There is a better solution...
	63	@addr: str of an address that can be in a format 0xfffff <type of the object
	64	at this address>
	65	Return: str of just the address
	66	"""
	67	str_addr = str(addr)
	68	ending_addr_index = str_addr.find('<')
	69	if ending_addr_index == -1:
	70	return str(addr)
	71	return str_addr[:ending_addr_index].strip()
[1cfdee9]	72
[bb75b4e]	73	def print_usage(obj):
[9987d79]	74	print(obj.__doc__)
[1cfdee9]	75
	76	def parse(args):
[9987d79]	77	"""
	78	Split the argument list in string format, where each argument is separated
	79	by whitespace delimiter, to a list of arguments like argv
	80	@args: str of arguments
	81	Return:
	82	[] if args is an empty string
	83	list if args is not empty
	84	"""
	85	# parse the string format of arguments and return a list of arguments
	86	argv = args.split(' ')
	87	if len(argv) == 1 and argv[0] == '':
	88	return []
	89	return argv
[1cfdee9]	90
[9dad5b3]	91	class ClusterIter:
	92	def __init__(self, root):
	93	self.curr = None
	94	self.root = root
	95
	96	def __iter__(self):
	97	return self
	98
	99	def __next__(self):
	100	# Clusters form a cycle
	101	# If we haven't seen the root yet, then the root is the first
	102	if not self.curr:
	103	self.curr = self.root
	104	return self.curr
	105
	106	# if we already saw the root, then go forward
	107	self.curr = self.curr['_X4nodeS26__cluster____dbg_node_cltr_1']['_X4nextPS7cluster_1']
	108
	109	# if we reached the root again, then we are done
	110	if self.curr == self.root:
	111	raise StopIteration
	112
	113	# otherwise return the next
	114	return self.curr
	115
	116	def all_clusters():
[9987d79]	117	"""
[9dad5b3]	118	Return: a list of all the clusters as an iterator.
	119	obtained from gdb.Value of globalClusters.root (is an address)
[9987d79]	120	"""
[9dad5b3]	121	if not is_cforall():
	122	return []
	123
[9987d79]	124	cluster_root = gdb.parse_and_eval('_X11mainClusterPS7cluster_1')
	125	if cluster_root.address == 0x0:
	126	print('No clusters, program terminated')
[9dad5b3]	127	return []
[1cfdee9]	128
[9dad5b3]	129	return ClusterIter(cluster_root)
[9987d79]	130
[9dad5b3]	131	class ProcIter:
	132	def __init__(self, root):
	133	self.curr = None
	134	self.root = root
[9987d79]	135
[9dad5b3]	136	def __iter__(self):
	137	return self
[9987d79]	138
[9dad5b3]	139	def check(self):
	140	# check if this is the last value
	141	addr = int(self.curr)
	142	mask = 1 << ((8 * int(gdb.parse_and_eval('sizeof(void*)'))) - 1)
	143	if 0 != (mask & addr):
	144	raise StopIteration
[9987d79]	145
[9dad5b3]	146	def __next__(self):
	147	cfa_t = get_cfa_types()
[9987d79]	148
[9dad5b3]	149	# Processors form a cycle
	150	# If we haven't seen the root yet, then the root is the first
	151	if not self.curr:
	152	my_next = self.root
	153	self.curr = my_next.cast(cfa_t.processor_ptr)
[9987d79]	154
[9dad5b3]	155	#check if this is an empty list
	156	self.check()
[9987d79]	157
[9dad5b3]	158	return self.curr
[d8b17e2]	159
[9dad5b3]	160	# if we already saw the root, then go forward
[2e94d94f]	161	my_next = self.curr['_X4linkS5dlink_S9processor__1']['_X4nextPY13__tE_generic__1']
[9dad5b3]	162	self.curr = my_next.cast(cfa_t.processor_ptr)
[d8b17e2]	163
[9dad5b3]	164	#check if we reached the end
	165	self.check()
[d8b17e2]	166
[9dad5b3]	167	# otherwise return the next
	168	return self.curr
[d8b17e2]	169
[160f1aa]	170	def start_from_dlist(dlist):
	171	fs = dlist.type.fields()
	172	if len(fs) != 1:
	173	print("Error, can't understand dlist type for", dlist, dlist.name, dlist.type)
	174	return None
	175
	176	return dlist[fs[0]]
	177
[9dad5b3]	178	def proc_list(cluster):
	179	"""
	180	Return: for a given processor, return the active and idle processors, as 2 iterators
	181	"""
	182	cfa_t = get_cfa_types()
	183	proclist = cluster['_X5procsS19__cluster_proc_list_1']
[160f1aa]	184
	185	idle = start_from_dlist(proclist['_X5idlesS5dlist_S9processorS5dlink_S9processor___1'])
	186	active = start_from_dlist(proclist['_X7activesS5dlist_S9processorS5dlink_S9processor___1'])
[9dad5b3]	187	return ProcIter(active.cast(cfa_t.processor_ptr)), ProcIter(idle.cast(cfa_t.processor_ptr))
[d8b17e2]	188
[9dad5b3]	189	def all_processors():
	190	procs = []
	191	for c in all_clusters():
	192	active, idle = proc_list(c)
	193	for p in active:
	194	procs.append(p)
[d8b17e2]	195
[9dad5b3]	196	for p in idle:
	197	procs.append(p)
	198
	199	print(procs)
	200	return procs
[d8b17e2]	201
	202	def tls_for_pthread(pthrd):
	203	prev = gdb.selected_thread()
	204	inf = gdb.selected_inferior()
	205
	206	thrd = inf.thread_from_thread_handle( pthrd )
	207	thrd.switch()
	208	tls = gdb.parse_and_eval('&_X9kernelTLSS16KernelThreadData_1')
	209
	210	prev.switch()
	211	return tls
	212
	213	def tls_for_proc(proc):
[9dad5b3]	214	return proc['_X10local_dataPS16KernelThreadData_1']
[d8b17e2]	215
	216	def thread_for_pthread(pthrd):
[b7d94ac5]	217	return tls_for_pthread(pthrd)['_X11this_threadVPS7thread$_1']
[d8b17e2]	218
	219	def thread_for_proc(proc):
[b7d94ac5]	220	return tls_for_proc(proc)['_X11this_threadVPS7thread$_1']
[d8b17e2]	221
	222
	223
	224	def find_curr_thread():
	225	# btstr = gdb.execute('bt', to_string = True).splitlines()
	226	# if len(btstr) == 0:
	227	# print('error')
	228	# return None
	229	# return btstr[0].split('this=',1)[1].split(',')[0].split(')')[0]
	230	return None
[96df7c9c]	231
[1cfdee9]	232	def lookup_cluster(name = None):
[9987d79]	233	"""
[9dad5b3]	234	Look up one or more cluster given a name
[9987d79]	235	@name: str
	236	Return: gdb.Value
	237	"""
	238	if not is_cforall():
	239	return None
	240
[9dad5b3]	241	clusters = all_clusters()
	242	if not clusters:
[9987d79]	243	return None
	244
	245	if not name:
[9dad5b3]	246	return clusters.root
[9987d79]	247
	248	# lookup for the task associated with the id
[9dad5b3]	249	found = [c for c in clusters if c['_X4namePKc_1'].string() == name]
	250
	251	if not found:
[9987d79]	252	print("Cannot find a cluster with the name: {}.".format(name))
	253	return None
	254
[9dad5b3]	255	return found
	256
[1cfdee9]	257
[96df7c9c]	258	def lookup_threads_by_cluster(cluster):
[9987d79]	259	# Iterate through a circular linked list of threads and accumulate them in an array
	260	threads = []
[96df7c9c]	261
[9987d79]	262	cfa_t = get_cfa_types()
[b7d94ac5]	263	root = cluster['_X7threadsS8__dllist_S7thread$__1']['_X4headPY15__TYPE_generic__1'].cast(cfa_t.thread_ptr)
[96df7c9c]	264
[9987d79]	265	if root == 0x0 or root.address == 0x0:
	266	print('There are no tasks for cluster: {}'.format(cluster))
	267	return threads
[96df7c9c]	268
[9987d79]	269	curr = root
	270	tid = 0
	271	sid = -1
[96df7c9c]	272
[9987d79]	273	while True:
	274	t = ThreadInfo(cluster, curr)
	275	if t.is_system():
	276	t.tid = sid
	277	sid -= 1
	278	else:
	279	t.tid = tid
	280	tid += 1
[96df7c9c]	281
[9987d79]	282	threads.append(t)
[96df7c9c]	283
[9987d79]	284	curr = curr['node']['next']
	285	if curr == root or curr == 0x0:
	286	break
[96df7c9c]	287
[9987d79]	288	return threads
[96df7c9c]	289
[1cfdee9]	290	def system_thread(thread):
[9987d79]	291	return False
[1cfdee9]	292
	293	def adjust_stack(pc, fp, sp):
[9987d79]	294	# pop sp, fp, pc from global stack
	295	gdb.execute('set $pc = {}'.format(pc))
	296	gdb.execute('set $rbp = {}'.format(fp))
	297	gdb.execute('set $sp = {}'.format(sp))
[1cfdee9]	298
	299	############################ COMMAND IMPLEMENTATION #########################
	300
	301	class Clusters(gdb.Command):
[9987d79]	302	"""Cforall: Display currently known clusters
[bb75b4e]	303	Usage:
[9987d79]	304	info clusters : print out all the clusters
[bb75b4e]	305	"""
[1cfdee9]	306
[9987d79]	307	def __init__(self):
	308	super(Clusters, self).__init__('info clusters', gdb.COMMAND_USER)
[1cfdee9]	309
[9987d79]	310	def print_cluster(self, cluster_name, cluster_address):
	311	print('{:>20} {:>20}'.format(cluster_name, cluster_address))
[1cfdee9]	312
[9987d79]	313	#entry point from gdb
	314	def invoke(self, arg, from_tty):
	315	if not is_cforall():
	316	return
[1cfdee9]	317
[9987d79]	318	if arg:
	319	print("info clusters does not take arguments")
	320	print_usage(self)
	321	return
[1cfdee9]	322
[9987d79]	323	self.print_cluster('Name', 'Address')
[1cfdee9]	324
[9987d79]	325	for c in all_clusters():
	326	self.print_cluster(c['_X4namePKc_1'].string(), str(c))
[1cfdee9]	327
[9987d79]	328	print("")
[1cfdee9]	329
	330	############
	331	class Processors(gdb.Command):
[9987d79]	332	"""Cforall: Display currently known processors
[bb75b4e]	333	Usage:
[d8b17e2]	334	info processors : print out all the processors
[9987d79]	335	info processors <cluster_name> : print out all processors in a given cluster
[bb75b4e]	336	"""
[1cfdee9]	337
[9987d79]	338	def __init__(self):
	339	super(Processors, self).__init__('info processors', gdb.COMMAND_USER)
	340
[9dad5b3]	341	def print_processor(self, processor, in_stats):
[d8b17e2]	342	should_stop = processor['_X12do_terminateVb_1']
	343	if not should_stop:
[9dad5b3]	344	status = in_stats
[d8b17e2]	345	else:
[9987d79]	346	stop_count = processor['_X10terminatedS9semaphore_1']['_X5counti_1']
[d8b17e2]	347	status_str = 'Last Thread' if stop_count >= 0 else 'Terminating'
	348	status = '{}({},{})'.format(status_str, should_stop, stop_count)
	349
	350	print('{:>20} {:>11} {:<7} {:<}'.format(
	351	processor['_X4namePKc_1'].string(),
	352	status,
	353	str(processor['_X18pending_preemptionb_1']),
	354	str(processor)
	355	))
	356	tls = tls_for_proc( processor )
[2e94d94f]	357	thrd = thread_for_proc( processor )
[d8b17e2]	358	if thrd != 0x0:
	359	tname = '{} {}'.format(thrd['self_cor']['name'].string(), str(thrd))
	360	else:
	361	tname = None
[9987d79]	362
[d8b17e2]	363	print('{:>20} {}'.format('Thread', tname))
	364	print('{:>20} {}'.format('TLS', tls))
[9987d79]	365
	366	#entry point from gdb
	367	def invoke(self, arg, from_tty):
	368	if not is_cforall():
	369	return
	370
	371	if not arg:
	372	clusters = all_clusters()
	373	else:
	374	clusters = [lookup_cluster(arg)]
	375
	376	if not clusters:
	377	print("No Cluster matching arguments found")
	378	return
	379
[d8b17e2]	380	print('{:>20} {:>11} {:<7} {}'.format('Processor', '', 'Pending', 'Object'))
	381	print('{:>20} {:>11} {:<7} {}'.format('Name', 'Status', 'Yield', 'Address'))
[9dad5b3]	382	for c in clusters:
	383	print('Cluster {}'.format(c['_X4namePKc_1'].string()))
[d8b17e2]	384
[9dad5b3]	385	active, idle = proc_list(c)
[d8b17e2]	386	# print the processor information
[9dad5b3]	387	for p in active:
	388	self.print_processor(p, 'Active')
	389
	390	for p in idle:
	391	self.print_processor(p, 'Idle')
	392
	393	print()
[9987d79]	394
	395	print()
[1cfdee9]	396
	397	############
	398	class Threads(gdb.Command):
[9987d79]	399	"""Cforall: Display currently known threads
[96df7c9c]	400	Usage:
[9987d79]	401	cfathreads : print Main Cluster threads, application threads only
	402	cfathreads all : print all clusters, all threads
	403	cfathreads <clusterName> : print cluster threads, application threads only
	404	"""
	405	def __init__(self):
	406	# The first parameter of the line below is the name of the command. You
	407	# can call it 'uc++ task'
	408	super(Threads, self).__init__('info cfathreads', gdb.COMMAND_USER)
	409
	410	def print_formatted(self, marked, tid, name, state, address):
	411	print('{:>1} {:>4} {:>20} {:>10} {:>20}'.format('*' if marked else ' ', tid, name, state, address))
	412
	413	def print_thread(self, thread, tid, marked):
	414	cfa_t = get_cfa_types()
[6abcb4d]	415	ys = str(thread['preempted'].cast(cfa_t.yield_state))
	416	if ys == '_X15__NO_PREEMPTIONKM19__Preemption_Reason_1':
	417	state = str(thread['state'].cast(cfa_t.thread_state))
	418	elif ys == '_X18__ALARM_PREEMPTIONKM19__Preemption_Reason_1':
	419	state = 'preempted'
	420	elif ys == '_X19__MANUAL_PREEMPTIONKM19__Preemption_Reason_1':
	421	state = 'yield'
	422	elif ys == '_X17__POLL_PREEMPTIONKM19__Preemption_Reason_1':
	423	state = 'poll'
	424	else:
	425	print("error: thread {} in undefined preemption state {}".format(thread, ys))
	426	state = 'error'
	427	self.print_formatted(marked, tid, thread['self_cor']['name'].string(), state, str(thread))
[9987d79]	428
	429	def print_threads_by_cluster(self, cluster, print_system = False):
	430	# Iterate through a circular linked list of tasks and print out its
	431	# name along with address associated to each cluster
	432	threads = lookup_threads_by_cluster(cluster)
	433	if not threads:
	434	return
	435
	436	running_thread = find_curr_thread()
	437	if running_thread is None:
	438	print('Could not identify current thread')
	439
	440	self.print_formatted(False, '', 'Name', 'State', 'Address')
	441
	442	for t in threads:
	443	if not t.is_system() or print_system:
	444	self.print_thread(t.value, t.tid, t.value == running_thread if running_thread else False)
	445
	446	print()
	447
	448	def print_all_threads(self):
	449	for c in all_clusters():
	450	self.print_threads_by_cluster(c, False)
	451
	452	def invoke(self, arg, from_tty):
	453	"""
	454	@arg: str
	455	@from_tty: bool
	456	"""
	457	if not is_cforall():
	458	return
	459
	460	if not arg:
	461	cluster = lookup_cluster()
	462	if not cluster:
	463	print("Could not find Main Cluster")
	464	return
	465
	466	# only tasks and main
	467	self.print_threads_by_cluster(cluster, False)
	468
	469	elif arg == 'all':
	470	# all threads, all clusters
	471	self.print_all_threads()
	472
	473	else:
	474	cluster = lookup_cluster(arg)
	475	if not cluster:
[9dad5b3]	476	print("No matching cluster")
[9987d79]	477	return
	478
	479	# all tasks, specified cluster
	480	self.print_threads_by_cluster(cluster, True)
[96df7c9c]	481
[bb75b4e]	482
	483	############
	484	class Thread(gdb.Command):
[9987d79]	485	"""Cforall: Switch to specified user threads
	486	Usage:
	487	cfathread <id> : switch stack to thread id on main cluster
	488	cfathread 0x<address> : switch stack to thread on any cluster
	489	cfathread <id> <clusterName> : switch stack to thread on specified cluster
	490	"""
	491	def __init__(self):
	492	# The first parameter of the line below is the name of the command. You
	493	# can call it 'uc++ task'
	494	super(Thread, self).__init__('cfathread', gdb.COMMAND_USER)
	495
	496	############################ AUXILIARY FUNCTIONS #########################
	497
	498	def switchto(self, thread):
	499	"""Change to a new task by switching to a different stack and manually
	500	adjusting sp, fp and pc
	501	@task_address: str
	502	2 supported format:
	503	in hex format
	504	<hex_address>: literal hexadecimal address
	505	Ex: 0xffffff
	506	in name of the pointer to the task
	507	"task_name": pointer of the variable name of the cluster
	508	Ex: T* s -> task_name = s
	509	Return: gdb.value of the cluster's address
	510	"""
	511	try:
	512	if not gdb.lookup_symbol('__cfactx_switch'):
	513	print('__cfactx_switch symbol is unavailable')
	514	return
	515	except:
	516	print('here 3')
	517
	518	cfa_t = get_cfa_types()
	519
	520	state = thread['state'].cast(cfa_t.thread_state)
	521	try:
	522	if state == gdb.parse_and_eval('Halted'):
	523	print('Cannot switch to a terminated thread')
	524	return
	525
	526	if state == gdb.parse_and_eval('Start'):
	527	print('Cannjot switch to a thread not yet run')
	528	return
	529	except:
	530	print("here 2")
	531	return
	532
	533
	534	context = thread['context']
	535
[c0c0bd5]	536
	537
	538	# must be at frame 0 to set pc register
	539	gdb.execute('select-frame 0')
	540	if gdb.selected_frame().architecture().name() != 'i386:x86-64':
	541	print('gdb debugging only supported for i386:x86-64 for now')
	542	return
	543
	544	# gdb seems to handle things much better if we pretend we just entered the context switch
	545	# pretend the pc is __cfactx_switch and adjust the sp, base pointer doesn't need to change
[9987d79]	546	# lookup for sp,fp and uSwitch
[c0c0bd5]	547	xsp = context['SP'] + 40 # 40 = 5 64bit registers : %r15, %r14, %r13, %r12, %rbx WARNING: x64 specific
[9987d79]	548	xfp = context['FP']
	549
	550	# convert string so we can strip out the address
	551	try:
[c0c0bd5]	552	xpc = get_addr(gdb.parse_and_eval('__cfactx_switch').address)
[9987d79]	553	except:
	554	print("here")
	555	return
	556
	557	# push sp, fp, pc into a global stack
	558	global STACK
	559	sp = gdb.parse_and_eval('$sp')
	560	fp = gdb.parse_and_eval('$fp')
	561	pc = gdb.parse_and_eval('$pc')
	562	stack_info = StackInfo(sp = sp, fp = fp, pc = pc)
	563	STACK.append(stack_info)
	564
	565	# update registers for new task
[c0c0bd5]	566	# print('switching to {} ({}) : [{}, {}, {}]'.format(thread['self_cor']['name'].string(), str(thread), str(xsp), str(xfp), str(xpc)))
	567	print('switching to thread {} ({})'.format(str(thread), thread['self_cor']['name'].string()))
[9987d79]	568	gdb.execute('set $rsp={}'.format(xsp))
	569	gdb.execute('set $rbp={}'.format(xfp))
	570	gdb.execute('set $pc={}'.format(xpc))
	571
	572	def find_matching_gdb_thread_id():
	573	"""
	574	Parse the str from info thread to get the number
	575	"""
	576	info_thread_str = gdb.execute('info thread', to_string=True).splitlines()
	577	for thread_str in info_thread_str:
	578	if thread_str.find('this={}'.format(task)) != -1:
	579	thread_id_pattern = r'^\*?\s+(\d+)\s+Thread'
	580	# retrive gdb thread id
	581	return re.match(thread_id_pattern, thread_str).group(1)
	582
	583	# check if the task is running or not
	584	if task_state == gdb.parse_and_eval('uBaseTask::Running'):
	585	# find the equivalent thread from info thread
	586	gdb_thread_id = find_matching_gdb_thread_id()
	587	if gdb_thread_id is None:
	588	print('cannot find the thread id to switch to')
	589	return
	590	# switch to that thread based using thread command
	591	gdb.execute('thread {}'.format(gdb_thread_id))
	592
	593	def switchto_id(self, tid, cluster):
	594	"""
	595	@cluster: cluster object
	596	@tid: int
	597	"""
	598	threads = lookup_threads_by_cluster( cluster )
	599
	600	for t in threads:
	601	if t.tid == tid:
	602	self.switchto(t.value)
	603	return
	604
	605	print("Cound not find thread by id '{}'".format(tid))
	606
	607	def invoke(self, arg, from_tty):
	608	"""
	609	@arg: str
	610	@from_tty: bool
	611	"""
	612	if not is_cforall():
	613	return
	614
	615	argv = parse(arg)
	616	if argv[0].isdigit():
	617	cname = " ".join(argv[1:]) if len(argv) > 1 else None
	618	cluster = lookup_cluster(cname)
	619	if not cluster:
	620	print("Could not find cluster '{}'".format(cname if cname else "Main Cluster"))
	621	return
	622
	623	try:
	624	tid = int(argv[0])
	625	except:
	626	print("'{}' not a valid thread id".format(argv[0]))
	627	print_usage(self)
	628	return
	629
	630	# by id, userCluster
	631	self.switchto_id(tid, cluster)
	632
	633	elif argv[0].startswith('0x') or argv[0].startswith('0X'):
	634	self.switchto(argv[0]) # by address, any cluster
[1cfdee9]	635
	636	############
	637	class PrevThread(gdb.Command):
[9987d79]	638	"""Switch back to previous task on the stack"""
	639	usage_msg = 'prevtask'
	640
	641	def __init__(self):
	642	super(PrevThread, self).__init__('prevtask', gdb.COMMAND_USER)
	643
	644	def invoke(self, arg, from_tty):
	645	"""
	646	@arg: str
	647	@from_tty: bool
	648	"""
	649	global STACK
	650	if len(STACK) != 0:
	651	# must be at frame 0 to set pc register
	652	gdb.execute('select-frame 0')
	653
	654	# pop stack
	655	stack_info = STACK.pop()
	656	pc = get_addr(stack_info.pc)
	657	sp = stack_info.sp
	658	fp = stack_info.fp
	659
	660	# pop sp, fp, pc from global stack
	661	adjust_stack(pc, fp, sp)
	662
	663	# must be at C++ frame to access C++ vars
	664	gdb.execute('frame 1')
	665	else:
	666	print('empty stack')
[1cfdee9]	667
	668	class ResetOriginFrame(gdb.Command):
[9987d79]	669	"""Reset to the origin frame prior to continue execution again"""
	670	usage_msg = 'resetOriginFrame'
	671	def __init__(self):
	672	super(ResetOriginFrame, self).__init__('reset', gdb.COMMAND_USER)
	673
	674	def invoke(self, arg, from_tty):
	675	"""
	676	@arg: str
	677	@from_tty: bool
	678	"""
	679	global STACK
	680	if len(STACK) != 0:
	681	stack_info = STACK.pop(0)
	682	STACK.clear()
	683	pc = get_addr(stack_info.pc)
	684	sp = stack_info.sp
	685	fp = stack_info.fp
	686
	687	# pop sp, fp, pc from global stack
	688	adjust_stack(pc, fp, sp)
	689
	690	# must be at C++ frame to access C++ vars
	691	gdb.execute('frame 1')
	692	#else:
	693	#print('reset: empty stack') #probably does not have to print msg
[1cfdee9]	694
	695	Clusters()
	696	Processors()
	697	ResetOriginFrame()
	698	PrevThread()
	699	Threads()
[9987d79]	700	Thread()
[1cfdee9]	701
	702	# Local Variables: #
	703	# mode: Python #
	704	# End: #

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