esp-idf/components/espcoredump/corefile/gdb.py

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#
# Copyright 2021 Espressif Systems (Shanghai) CO., LTD
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import logging
import re
import time
from pygdbmi.gdbcontroller import DEFAULT_GDB_TIMEOUT_SEC, GdbController
from . import ESPCoreDumpError
class EspGDB(object):
def __init__(self, gdb_path, gdb_cmds, core_filename, prog_filename, timeout_sec=DEFAULT_GDB_TIMEOUT_SEC):
"""
Start GDB and initialize a GdbController instance
"""
gdb_args = ['--quiet', # inhibit dumping info at start-up
'--nx', # inhibit window interface
'--nw', # ignore .gdbinit
'--interpreter=mi2', # use GDB/MI v2
'--core=%s' % core_filename] # core file
for c in gdb_cmds:
if c:
gdb_args += ['-ex', c]
gdb_args.append(prog_filename)
self.p = GdbController(gdb_path=gdb_path, gdb_args=gdb_args)
self.timeout = timeout_sec
# Consume initial output by issuing a dummy command
self._gdbmi_run_cmd_get_responses(cmd='-data-list-register-values x pc',
resp_message=None, resp_type='console', multiple=True,
done_message='done', done_type='result')
def __del__(self):
try:
self.p.exit()
except IndexError:
logging.warning('Attempt to terminate the GDB process failed, because it is already terminated. Skip')
def _gdbmi_run_cmd_get_responses(self, cmd, resp_message, resp_type, multiple=True,
done_message=None, done_type=None):
self.p.write(cmd, read_response=False)
t_end = time.time() + self.timeout
filtered_response_list = []
all_responses = []
while time.time() < t_end:
more_responses = self.p.get_gdb_response(timeout_sec=0, raise_error_on_timeout=False)
filtered_response_list += filter(lambda rsp: rsp['message'] == resp_message and rsp['type'] == resp_type,
more_responses)
all_responses += more_responses
if filtered_response_list and not multiple:
break
if done_message and done_type and self._gdbmi_filter_responses(more_responses, done_message, done_type):
break
if not filtered_response_list and not multiple:
raise ESPCoreDumpError("Couldn't find response with message '{}', type '{}' in responses '{}'".format(
resp_message, resp_type, str(all_responses)
))
return filtered_response_list
def _gdbmi_run_cmd_get_one_response(self, cmd, resp_message, resp_type):
return self._gdbmi_run_cmd_get_responses(cmd, resp_message, resp_type, multiple=False)[0]
def _gdbmi_data_evaluate_expression(self, expr):
""" Get the value of an expression, similar to the 'print' command """
return self._gdbmi_run_cmd_get_one_response("-data-evaluate-expression \"%s\"" % expr,
'done', 'result')['payload']['value']
def get_freertos_task_name(self, tcb_addr):
""" Get FreeRTOS task name given the TCB address """
try:
val = self._gdbmi_data_evaluate_expression('(char*)((TCB_t *)0x%x)->pcTaskName' % tcb_addr)
except (ESPCoreDumpError, KeyError):
# KeyError is raised when "value" is not in "payload"
return ''
# Value is of form '0x12345678 "task_name"', extract the actual name
result = re.search(r"\"([^']*)\"$", val)
if result:
return result.group(1)
return ''
def run_cmd(self, gdb_cmd):
""" Execute a generic GDB console command via MI2
"""
filtered_responses = self._gdbmi_run_cmd_get_responses(cmd="-interpreter-exec console \"%s\"" % gdb_cmd,
resp_message=None, resp_type='console', multiple=True,
done_message='done', done_type='result')
return ''.join([x['payload'] for x in filtered_responses]) \
.replace('\\n', '\n') \
.replace('\\t', '\t') \
.rstrip('\n')
def get_thread_info(self):
""" Get information about all threads known to GDB, and the current thread ID """
result = self._gdbmi_run_cmd_get_one_response('-thread-info', 'done', 'result')['payload']
current_thread_id = result['current-thread-id']
threads = result['threads']
return threads, current_thread_id
def switch_thread(self, thr_id):
""" Tell GDB to switch to a specific thread, given its ID """
self._gdbmi_run_cmd_get_one_response('-thread-select %s' % thr_id, 'done', 'result')
@staticmethod
def _gdbmi_filter_responses(responses, resp_message, resp_type):
return list(filter(lambda rsp: rsp['message'] == resp_message and rsp['type'] == resp_type, responses))
@staticmethod
def gdb2freertos_thread_id(gdb_target_id):
""" Convert GDB 'target ID' to the FreeRTOS TCB address """
return int(gdb_target_id.replace('process ', ''), 0)