source: doc/theses/lynn_tran_SE499/SE499-master/utils-gdb.py @ 1b34b87

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resnenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprno_listpersistent-indexerpthread-emulationqualifiedEnum
Last change on this file since 1b34b87 was 1b34b87, checked in by Peter A. Buhr <pabuhr@…>, 6 years ago

Lynn's GDB essay
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1"""
2To run this extension, the python name has to be as same as one of the loaded library
3Additionally, the file must exist in a folder which is in gdb's safe path
4"""
5import collections
6import gdb
7
8# set these signal handlers with some settings (nostop, noprint, pass)
9gdb.execute('handle SIGALRM nostop noprint pass')
10gdb.execute('handle SIGUSR1 nostop noprint pass')
11
12# GDB types for various structures/types in uC++
13uCluster_ptr_type = gdb.lookup_type('uCluster').pointer()
14uClusterDL_ptr_type = gdb.lookup_type('uClusterDL').pointer()
15uBaseTask_ptr_type = gdb.lookup_type('uBaseTask').pointer()
16uBaseTaskDL_ptr_type = gdb.lookup_type('uBaseTaskDL').pointer()
17int_ptr_type = gdb.lookup_type('int').pointer()
18
19# A named tuple representing information about a stack
20StackInfo = collections.namedtuple('StackInfo', 'sp fp pc')
21
22# A global variable to keep track of stack information as one context switches
23# from one task to another task
24STACK = []
25
26# A global variable to keep all system task name
27SysTask_Name = ["uLocalDebuggerReader", "uLocalDebugger", "uProcessorTask", "uBootTask", "uSystemTask", 
28"uProcessorTask", "uPthread", "uProfiler"]
29
30def get_addr(addr):
31    """
32    NOTE: sketchy solution to retrieve address. There is a better solution...
33    @addr: str of an address that can be in a format 0xfffff <type of the object
34    at this address>
35    Return: str of just the address
36    """
37    str_addr = str(addr)
38    ending_addr_index = str_addr.find('<')
39    if ending_addr_index == -1:
40        return str(addr)
41    return str_addr[:ending_addr_index].strip()
42
43def print_usage(msg):
44    """
45    Print out usage message
46    @msg: str
47    """
48    print('Usage: ' + msg)
49
50def get_argv_list(args):
51    """
52    Split the argument list in string format, where each argument is separated
53    by whitespace delimiter, to a list of arguments like argv
54    @args: str of arguments
55    Return:
56        [] if args is an empty string
57        list if args is not empty
58    """
59    # parse the string format of arguments and return a list of arguments
60    argv = args.split(' ')
61    if len(argv) == 1 and argv[0] == '':
62        return []
63    return argv
64
65def get_cluster_root():
66    """
67    Return: gdb.Value of globalClusters.root (is an address)
68    """
69    cluster_root = gdb.parse_and_eval('uKernelModule::globalClusters.root')
70    if cluster_root.address == 0x0:
71        print('No clusters, program terminated')
72    return cluster_root
73
74def lookup_cluster_by_name(cluster_name):
75    """
76    Look up a cluster given its ID
77    @cluster_name: str
78    Return: gdb.Value
79    """
80    cluster_root = get_cluster_root()
81    if cluster_root.address == 0x0:
82        return cluster_root.address
83
84    # lookup for the task associated with the id
85    cluster = 0x0
86    curr = cluster_root
87    while True:
88        if curr['cluster_']['name'].string() == cluster_name:
89            cluster = curr['cluster_'].address
90            break
91        curr = curr['next'].cast(uClusterDL_ptr_type)
92        if curr == cluster_root:
93            break
94
95    if cluster == 0x0:
96        print("Cannot find a cluster with the name: {}.".format(cluster_name))
97    return cluster
98
99############################ COMMAND IMPLEMENTATION #########################
100
101class Clusters(gdb.Command):
102    """Print out the list of available clusters"""
103    usage_msg = 'cluster'
104    def __init__(self):
105        super(Clusters, self).__init__('clusters', gdb.COMMAND_USER)
106
107    def invoke(self, arg, from_tty):
108        """
109        Iterate through a circular linked list of clusters and print out its
110        name along with address associated to each cluster
111        @arg: str
112        @from_tty: bool
113        """
114        argv = get_argv_list(arg)
115        if len(argv) != 0:
116            print_usage(self.usage_msg)
117            return
118
119        cluster_root = get_cluster_root()
120        if cluster_root.address == 0x0:
121            return
122        curr = cluster_root
123        print('{:>20}{:>18}'.format('Name', 'Address'))
124
125        while True:
126            print('{:>20}{:>18}'.format(curr['cluster_']['name'].string(),
127                                        str(curr['cluster_'].reference_value())[1:]))
128            curr = curr['next'].cast(uClusterDL_ptr_type)
129            if curr == cluster_root:
130                break
131
132class ClusterProcessors(gdb.Command):
133    """Display a list of all info about all available processors on a particular cluster"""
134    usage_msg = 'processors <cluster_name>'
135    def __init__(self):
136        super(ClusterProcessors, self).__init__('processors', gdb.COMMAND_USER)
137
138    def invoke(self, arg, from_tty):
139        """
140        Iterate through a circular linked list of tasks and print out all
141        info about each processor in that cluster
142        @arg: str
143        @from_tty: bool
144        """
145        argv = get_argv_list(arg)
146        if len(argv) > 1:
147            print_usage(self.usage_msg)
148            return
149
150        if len(argv) == 0:
151            cluster_address = lookup_cluster_by_name("userCluster")
152        else:
153            cluster_address = lookup_cluster_by_name(argv[0])
154
155        if cluster_address == 0x0:
156            return
157
158        processor_root = cluster_address.cast(uCluster_ptr_type)['processorsOnCluster']['root']
159        if processor_root.address == 0x0:
160            print('There are no processors for cluster at address: {}'.format(cluster_address))
161            return
162
163        uProcessorDL_ptr_type = gdb.lookup_type('uProcessorDL').pointer()
164        print('{:>18}{:>20}{:>20}{:>20}'.format('Address', 'PID', 'Preemption', 'Spin'))
165        curr = processor_root
166
167        while True:
168            processor = curr['processor_']
169            print('{:>18}{:>20}{:>20}{:>20}'.format(get_addr(processor.address),
170                        str(processor['pid']), str(processor['preemption']),
171                        str(processor['spin'])))
172
173            curr = curr['next'].cast(uProcessorDL_ptr_type)
174            if curr == processor_root:
175                break
176
177class Task(gdb.Command):
178    usage_msg = """
179    task                            : print userCluster tasks, application tasks only
180    task <clusterName>              : print cluster tasks, application tasks only
181    task all                        : print all clusters, all tasks
182    task <id>                       : context switch to task id on userCluster
183    task 0x<address>                : context switch to task on any cluster
184    task <id> <clusterName>         : context switch to task on specified cluster
185    """
186    def __init__(self):
187        # The first parameter of the line below is the name of the command. You
188        # can call it 'uc++ task'
189        super(Task, self).__init__('task', gdb.COMMAND_USER)
190
191    ############################ AUXILIARY FUNCTIONS #########################
192
193    def print_tasks_by_cluster_all(self, cluster_address):
194        """
195        Display a list of all info about all available tasks on a particular cluster
196        @cluster_address: gdb.Value
197        """
198        cluster_address = cluster_address.cast(uCluster_ptr_type)
199        task_root = cluster_address['tasksOnCluster']['root']
200
201        if task_root.address == 0x0:
202            print('There are no tasks for cluster at address: {}'.format(cluster_address))
203            return
204
205        print('{:>4}{:>20}{:>18}{:>25}'.format('ID', 'Task Name', 'Address', 'State'))
206        curr = task_root
207        task_id = 0
208        systask_id = -1
209
210        btstr = gdb.execute('bt', to_string = True)
211        break_addr = btstr.splitlines()[0].split('this=',1)[1].split(',')[0].split(')')[0]
212
213        while True:
214            global SysTask_Name
215            if (curr['task_']['name'].string() in SysTask_Name):
216                if str(curr['task_'].reference_value())[1:] == break_addr:
217                    print(
218                            ('{:>4}{:>20}{:>18}{:>25}'.format('* '+str(systask_id), curr['task_']['name'].string(),
219                            str(curr['task_'].reference_value())[1:],
220                            str(curr['task_']['state']))
221                        )
222                    )
223                else:
224                    print(
225                            ('{:>4}{:>20}{:>18}{:>25}'.format(systask_id, curr['task_']['name'].string(),
226                            str(curr['task_'].reference_value())[1:],
227                            str(curr['task_']['state']))
228                        )
229                    )
230                systask_id -= 1
231            else:
232                if str(curr['task_'].reference_value())[1:] == break_addr:
233                    print('{:>4}{:>20}{:>18}{:>25}'.format('* '+str(task_id), curr['task_']['name'].string(),
234                                                           str(curr['task_'].reference_value())[1:],
235                                                           str(curr['task_']['state']))
236                    )
237                else:
238                    print('{:>4}{:>20}{:>18}{:>25}'.format(task_id, curr['task_']['name'].string(),
239                                                           str(curr['task_'].reference_value())[1:],
240                                                           str(curr['task_']['state']))
241                    )
242                task_id += 1
243
244            curr = curr['next'].cast(uBaseTaskDL_ptr_type)
245            if curr == task_root:
246                break
247
248    def print_tasks_by_cluster_address_all(self, cluster_address):
249        """
250        Display a list of all info about all available tasks on a particular cluster
251        @cluster_address: str
252        """
253        # Iterate through a circular linked list of tasks and print out its
254        # name along with address associated to each cluster
255
256        # convert hex string to hex number
257        try:
258            hex_addr = int(cluster_address, 16)
259        except:
260            print_usage(self.usage_msg)
261            return
262
263        cluster_address = gdb.Value(hex_addr)
264        self.print_tasks_by_cluster_all(cluster_address)
265
266    def print_tasks_by_cluster_address(self, cluster_address):
267        """
268        Display a list of limited info about all available tasks on a particular cluster
269        @cluster_address: str
270        """
271        # Iterate through a circular linked list of tasks and print out its
272        # name along with address associated to each cluster
273
274        # convert hex string to hex number
275        try:
276            hex_addr = int(cluster_address, 16)
277        except:
278            print_usage(self.usage_msg)
279            return
280
281        cluster_address = gdb.Value(hex_addr).cast(uCluster_ptr_type)
282        task_root = cluster_address['tasksOnCluster']['root']
283
284        if task_root.address == 0x0:
285            print('There are no tasks for cluster at address: {}'.format(cluster_address))
286            return
287
288        print('{:>4}{:>20}{:>18}{:>25}'.format('ID', 'Task Name', 'Address', 'State'))
289        curr = task_root
290        task_id = 0
291        btstr = gdb.execute('bt', to_string = True)
292        break_addr = btstr.splitlines()[0].split('this=',1)[1].split(',')[0].split(')')[0]
293
294        while True:
295            global SysTask_Name
296            if (curr['task_']['name'].string() not in SysTask_Name):
297                if str(curr['task_'].reference_value())[1:] == break_addr:           
298                    print(
299                        ('{:>4}{:>20}{:>18}{:>25}'.format('* '+str(task_id), curr['task_']['name'].string(),
300                        str(curr['task_'].reference_value())[1:],
301                        str(curr['task_']['state']))
302                    )
303                )
304                else:
305                    print('{:>4}{:>20}{:>18}{:>25}'.format(task_id, curr['task_']['name'].string(),
306                                                           str(curr['task_'].reference_value())[1:],
307                                                           str(curr['task_']['state']))
308                    )
309
310                curr = curr['next'].cast(uBaseTaskDL_ptr_type)
311                task_id += 1
312                if curr == task_root:
313                    break
314            else:
315                curr = curr['next'].cast(uBaseTaskDL_ptr_type)
316                if curr == task_root:
317                    break
318
319    ############################ COMMAND FUNCTIONS #########################
320
321    def print_user_tasks(self):
322        """Iterate only userCluster, print only tasks and main""" 
323
324        cluster_address = lookup_cluster_by_name("userCluster")
325        if cluster_address == 0x0:
326            return
327
328        self.print_tasks_by_cluster_address(str(cluster_address))
329
330
331    def print_all_tasks(self):
332        """Iterate through each cluster, iterate through all tasks and  print out info about all the tasks
333        in those clusters"""
334        cluster_root = get_cluster_root()
335        if cluster_root.address == 0x0:
336            return
337
338        curr = cluster_root
339        print('{:>20}{:>18}'.format('Cluster Name', 'Address'))
340
341        while True:
342            addr = str(curr['cluster_'].reference_value())[1:]
343            print('{:>20}{:>18}'.format(curr['cluster_']['name'].string(), addr))
344
345            self.print_tasks_by_cluster_address_all(addr)
346            curr = curr['next'].cast(uClusterDL_ptr_type)
347            if curr == cluster_root:
348                break
349
350    def pushtask_by_address(self, task_address):
351        """Change to a new task by switching to a different stack and manually
352        adjusting sp, fp and pc
353        @task_address: str
354            2 supported format:
355                in hex format
356                    <hex_address>: literal hexadecimal address
357                    Ex: 0xffffff
358                in name of the pointer to the task
359                    "task_name": pointer of the variable name of the cluster
360                        Ex: T* s -> task_name = s
361            Return: gdb.value of the cluster's address
362        """
363        # Task address has a format "task_address", which implies that it is the
364        # name of the variable, and it needs to be evaluated
365        if task_address.startswith('"') and task_address.endswith('"'):
366            task = gdb.parse_and_eval(task_address.replace('"', ''))
367        else:
368        # Task address format does not include the quotation marks, which implies
369        # that it is a hex address
370            # convert hex string to hex number
371            try:
372                hex_addr = int(task_address, 16)
373            except:
374                print_usage(self.usage_msg)
375                return
376            task_address = gdb.Value(hex_addr)
377            task = task_address.cast(uBaseTask_ptr_type)
378
379        uContext_t_ptr_type = gdb.lookup_type('UPP::uMachContext::uContext_t').pointer()
380
381        task_state = task['state']
382        if task_state == gdb.parse_and_eval('uBaseTask::Terminate'):
383            print('Cannot switch to a terminated thread')
384            return
385        task_context = task['context'].cast(uContext_t_ptr_type)
386
387        # lookup for sp,fp and uSwitch
388        xsp = task_context['SP'] + 48
389        xfp = task_context['FP']
390        if not gdb.lookup_symbol('uSwitch'):
391            print('uSwitch symbol is unavailable')
392            return
393
394        # convert string so we can strip out the address
395        xpc = get_addr(gdb.parse_and_eval('uSwitch').address + 28)
396        # must be at frame 0 to set pc register
397        gdb.execute('select-frame 0')
398
399        # push sp, fp, pc into a global stack
400        global STACK
401        sp = gdb.parse_and_eval('$sp')
402        fp = gdb.parse_and_eval('$fp')
403        pc = gdb.parse_and_eval('$pc')
404        stack_info = StackInfo(sp = sp, fp = fp, pc = pc)
405        STACK.append(stack_info)
406
407        # update registers for new task
408        gdb.execute('set $rsp={}'.format(xsp))
409        gdb.execute('set $rbp={}'.format(xfp))
410        gdb.execute('set $pc={}'.format(xpc))
411
412    def pushtask_by_id(self, task_id, cluster_name):
413        """
414        @cluster_name: str
415        @task_id: str
416        """
417        try:
418            task_id = int(task_id)
419        except:
420            print_usage(self.usage_msg)
421            return
422
423        # retrieve the address associated with the cluster name
424        cluster_address = lookup_cluster_by_name(cluster_name)
425        if cluster_address == 0x0:
426            return
427
428        task_root = cluster_address.cast(uCluster_ptr_type)['tasksOnCluster']['root']
429        if task_root.address == 0x0:
430            print('There are no tasks on this cluster')
431            return
432
433        user_id = 0
434        task_addr = None
435        systask_id = -1 # system search id starts with negative
436
437        # lookup for the task associated with the id
438        global SysTask_Name
439        if (task_id >= 0 and cluster_name == "systemCluster"):
440            print('internal error: systemCluster does not have ID >= 0')
441            return
442        #id is a system task
443        elif task_id < 0:
444            curr = task_root
445            rootflag = False
446            while (curr['task_']['name'].string() not in SysTask_Name):
447                curr = curr['next'].cast(uBaseTaskDL_ptr_type)
448                if curr == task_root:
449                    rootflag = True
450                    break
451            if rootflag == False:
452                if task_id == systask_id:
453                    task_addr = str(curr['task_'].address)
454                else:
455                    while True:
456                        curr = curr['next'].cast(uBaseTaskDL_ptr_type)
457
458                        if (curr['task_']['name'].string() in SysTask_Name):
459                            systask_id -= 1
460                            if curr == task_root:
461                                break
462                            if task_id == systask_id:
463                                task_addr = str(curr['task_'].address)
464                                break
465
466                        if curr == task_root:
467                            break
468        #id is a user task
469        else:
470            curr = task_root
471            rootflag = False
472            while (curr['task_']['name'].string() in SysTask_Name):
473                curr = curr['next'].cast(uBaseTaskDL_ptr_type)
474                if curr == task_root:
475                    rootflag = True
476                    break
477            if rootflag == False:
478                if task_id == user_id:
479                    task_addr = str(curr['task_'].address)
480                else:
481                    while True:
482                        curr = curr['next'].cast(uBaseTaskDL_ptr_type)
483
484                        if (curr['task_']['name'].string() not in SysTask_Name):
485                            user_id += 1
486                            if curr == task_root:
487                                break
488                            if task_id == user_id:
489                                task_addr = str(curr['task_'].address)
490                                break
491
492                        if curr == task_root:
493                            break
494
495        if not task_addr:
496            print("Cannot find task ID: {}. Only have {} tasks".format(task_id,user_id))
497        else:
498            self.pushtask_by_address(task_addr)
499
500    def print_tasks_by_cluster_name(self, cluster_name):
501        """
502        Print out all the tasks available in the specified cluster
503        @cluster_name: str
504        """
505        cluster_address = lookup_cluster_by_name(cluster_name)
506        if cluster_address == 0x0:
507            return
508
509        self.print_tasks_by_cluster_all(cluster_address)
510
511    def invoke(self, arg, from_tty):
512        """
513        @arg: str
514        @from_tty: bool
515        """
516        argv = get_argv_list(arg)
517        if len(argv) == 0:
518            # print tasks
519            self.print_user_tasks() # only tasks and main
520        elif len(argv) == 1:
521            # push task
522            if argv[0].isdigit():
523                self.pushtask_by_id(argv[0], "userCluster") # by id, userCluster
524            elif argv[0].startswith('0x') or argv[0].startswith('0X'):
525                self.pushtask_by_address(argv[0]) # by address, any cluster
526            # print tasks
527            elif argv[0] == 'all':
528                self.print_all_tasks() # all tasks, all clusters
529            else:
530                self.print_tasks_by_cluster_name(argv[0]) # all tasks, specified cluster
531        elif len(argv) == 2:
532            # push task
533            self.pushtask_by_id(argv[0], argv[1]) # by id, specified cluster
534        else:
535            print('parse error')
536            print_usage(self.usage_msg)
537
538class PrevTask(gdb.Command):
539    """Switch back to previous task on the stack"""
540    usage_msg = 'prevtask <task_address>'
541
542    def __init__(self):
543        super(PrevTask, self).__init__('prevtask', gdb.COMMAND_USER)
544
545    def invoke(self, arg, from_tty):
546        """
547        @arg: str
548        @from_tty: bool
549        """
550        global STACK
551        if len(STACK) != 0:
552            # must be at frame 0 to set pc register
553            gdb.execute('select-frame 0')
554
555            # pop stack
556            stack_info = STACK.pop()
557            pc = get_addr(stack_info.pc)
558            sp = stack_info.sp
559            fp = stack_info.fp
560
561            # pop sp, fp, pc from global stack
562            gdb.execute('set $pc = {}'.format(pc))
563            gdb.execute('set $rbp = {}'.format(fp))
564            gdb.execute('set $sp = {}'.format(sp))
565
566            # must be at C++ frame to access C++ vars
567            gdb.execute('frame 1')
568        else:
569            print('empty stack')
570
571class ResetOriginFrame(gdb.Command):
572    """Reset to the origin frame prior to continue execution again"""
573    usage_msg = 'resetOriginFrame'
574    def __init__(self):
575        super(ResetOriginFrame, self).__init__('reset', gdb.COMMAND_USER)
576
577    def invoke(self, arg, from_tty):
578        """
579        @arg: str
580        @from_tty: bool
581        """
582        global STACK
583        if len(STACK) != 0:
584            stack_info = STACK.pop(0)
585            STACK.clear()
586            pc = get_addr(stack_info.pc)
587            sp = stack_info.sp
588            fp = stack_info.fp
589
590            # pop sp, fp, pc from global stack
591            gdb.execute('set $pc = {}'.format(pc))
592            gdb.execute('set $rbp = {}'.format(fp))
593            gdb.execute('set $sp = {}'.format(sp))
594
595            # must be at C++ frame to access C++ vars
596            gdb.execute('frame 1')
597        #else:
598            #print('reset: empty stack') #probably does not have to print msg
599
600Clusters()
601ClusterProcessors()
602PrevTask()
603ResetOriginFrame()
604Task()
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