#!/usr/bin/env python3
"""ESP Exception Decoder
github: https://github.com/janLo/EspArduinoExceptionDecoder
license: GPL v3
author: Jan Losinski
Meshtastic notes:
* original version is at: https://github.com/janLo/EspArduinoExceptionDecoder
* version that's checked into meshtastic repo is based on: https://github.com/me21/EspArduinoExceptionDecoder
which adds in ESP32 Backtrace decoding.
* this also updates the defaults to use ESP32, instead of ESP8266 and defaults to the built firmware.bin
To use, copy the "Backtrace: 0x...." line to a file, e.g., backtrace.txt, then run:
$ bin/exception_decoder.py backtrace.txt
"""
import argparse
import re
import subprocess
from collections import namedtuple
import sys
import os
EXCEPTIONS = [
"Illegal instruction",
"SYSCALL instruction",
"InstructionFetchError: Processor internal physical address or data error during instruction fetch",
"LoadStoreError: Processor internal physical address or data error during load or store",
"Level1Interrupt: Level-1 interrupt as indicated by set level-1 bits in the INTERRUPT register",
"Alloca: MOVSP instruction, if caller's registers are not in the register file",
"IntegerDivideByZero: QUOS, QUOU, REMS, or REMU divisor operand is zero",
"reserved",
"Privileged: Attempt to execute a privileged operation when CRING ? 0",
"LoadStoreAlignmentCause: Load or store to an unaligned address",
"reserved",
"reserved",
"InstrPIFDataError: PIF data error during instruction fetch",
"LoadStorePIFDataError: Synchronous PIF data error during LoadStore access",
"InstrPIFAddrError: PIF address error during instruction fetch",
"LoadStorePIFAddrError: Synchronous PIF address error during LoadStore access",
"InstTLBMiss: Error during Instruction TLB refill",
"InstTLBMultiHit: Multiple instruction TLB entries matched",
"InstFetchPrivilege: An instruction fetch referenced a virtual address at a ring level less than CRING",
"reserved",
"InstFetchProhibited: An instruction fetch referenced a page mapped with an attribute that does not permit instruction fetch",
"reserved",
"reserved",
"reserved",
"LoadStoreTLBMiss: Error during TLB refill for a load or store",
"LoadStoreTLBMultiHit: Multiple TLB entries matched for a load or store",
"LoadStorePrivilege: A load or store referenced a virtual address at a ring level less than CRING",
"reserved",
"LoadProhibited: A load referenced a page mapped with an attribute that does not permit loads",
"StoreProhibited: A store referenced a page mapped with an attribute that does not permit stores"
]
PLATFORMS = {
"ESP8266": "lx106",
"ESP32": "esp32"
}
BACKTRACE_REGEX = re.compile(r"(?:\s+(0x40[0-2](?:\d|[a-f]|[A-F]){5}):0x(?:\d|[a-f]|[A-F]){8})\b")
EXCEPTION_REGEX = re.compile("^Exception \\((?P<exc>[0-9]*)\\):$")
COUNTER_REGEX = re.compile('^epc1=(?P<epc1>0x[0-9a-f]+) epc2=(?P<epc2>0x[0-9a-f]+) epc3=(?P<epc3>0x[0-9a-f]+) '
'excvaddr=(?P<excvaddr>0x[0-9a-f]+) depc=(?P<depc>0x[0-9a-f]+)$')
CTX_REGEX = re.compile("^ctx: (?P<ctx>.+)$")
POINTER_REGEX = re.compile('^sp: (?P<sp>[0-9a-f]+) end: (?P<end>[0-9a-f]+) offset: (?P<offset>[0-9a-f]+)$')
STACK_BEGIN = '>>>stack>>>'
STACK_END = '<<<stack<<<'
STACK_REGEX = re.compile(
'^(?P<off>[0-9a-f]+):\W+(?P<c1>[0-9a-f]+) (?P<c2>[0-9a-f]+) (?P<c3>[0-9a-f]+) (?P<c4>[0-9a-f]+)(\W.*)?$')
StackLine = namedtuple("StackLine", ["offset", "content"])
class ExceptionDataParser(object):
def __init__(self):
self.exception = None
self.epc1 = None
self.epc2 = None
self.epc3 = None
self.excvaddr = None
self.depc = None
self.ctx = None
self.sp = None
self.end = None
self.offset = None
self.stack = []
def _parse_backtrace(self, line):
if line.startswith('Backtrace:'):
self.stack = [StackLine(offset=0, content=(addr,)) for addr in BACKTRACE_REGEX.findall(line)]
return None
return self._parse_backtrace
def _parse_exception(self, line):
match = EXCEPTION_REGEX.match(line)
if match is not None:
self.exception = int(match.group('exc'))
return self._parse_counters
return self._parse_exception
def _parse_counters(self, line):
match = COUNTER_REGEX.match(line)
if match is not None:
self.epc1 = match.group("epc1")
self.epc2 = match.group("epc2")
self.epc3 = match.group("epc3")
self.excvaddr = match.group("excvaddr")
self.depc = match.group("depc")
return self._parse_ctx
return self._parse_counters
def _parse_ctx(self, line):
match = CTX_REGEX.match(line)
if match is not None:
self.ctx = match.group("ctx")
return self._parse_pointers
return self._parse_ctx
def _parse_pointers(self, line):
match = POINTER_REGEX.match(line)
if match is not None:
self.sp = match.group("sp")
self.end = match.group("end")
self.offset = match.group("offset")
return self._parse_stack_begin
return self._parse_pointers
def _parse_stack_begin(self, line):
if line == STACK_BEGIN:
return self._parse_stack_line
return self._parse_stack_begin
def _parse_stack_line(self, line):
if line != STACK_END:
match = STACK_REGEX.match(line)
if match is not None:
self.stack.append(StackLine(offset=match.group("off"),
content=(match.group("c1"), match.group("c2"), match.group("c3"),
match.group("c4"))))
return self._parse_stack_line
return None
def parse_file(self, file, platform, stack_only=False):
if platform == 'ESP32':
func = self._parse_backtrace
else:
func = self._parse_exception
if stack_only:
func = self._parse_stack_begin
for line in file:
func = func(line.strip())
if func is None:
break
if func is not None:
print("ERROR: Parser not complete!")
sys.exit(1)
class AddressResolver(object):
def __init__(self, tool_path, elf_path):
self._tool = tool_path
self._elf = elf_path
self._address_map = {}
def _lookup(self, addresses):
cmd = [self._tool, "-aipfC", "-e", self._elf] + [addr for addr in addresses if addr is not None]
if sys.version_info[0] < 3:
output = subprocess.check_output(cmd)
else:
output = subprocess.check_output(cmd, encoding="utf-8")
line_regex = re.compile("^(?P<addr>[0-9a-fx]+): (?P<result>.+)$")
last = None
for line in output.splitlines():
line = line.strip()
match = line_regex.match(line)
if match is None:
if last is not None and line.startswith('(inlined by)'):
line = line [12:].strip()
self._address_map[last] += ("\n \-> inlined by: " + line)
continue
if match.group("result") == '?? ??:0':
continue
self._address_map[match.group("addr")] = match.group("result")
last = match.group("addr")
def fill(self, parser):
addresses = [parser.epc1, parser.epc2, parser.epc3, parser.excvaddr, parser.sp, parser.end, parser.offset]
for line in parser.stack:
addresses.extend(line.content)
self._lookup(addresses)
def _sanitize_addr(self, addr):
if addr.startswith("0x"):
addr = addr[2:]
fill = "0" * (8 - len(addr))
return "0x" + fill + addr
def resolve_addr(self, addr):
out = self._sanitize_addr(addr)
if out in self._address_map:
out += ": " + self._address_map[out]
return out
def resolve_stack_addr(self, addr, full=True):
addr = self._sanitize_addr(addr)
if addr in self._address_map:
return addr + ": " + self._address_map[addr]
if full:
return "[DATA (0x" + addr + ")]"
return None
def print_addr(name, value, resolver):
print("{}:{} {}".format(name, " " * (8 - len(name)), resolver.resolve_addr(value)))
def print_stack_full(lines, resolver):
print("stack:")
for line in lines:
print(str(line.offset) + ":")
for content in line.content:
print(" " + resolver.resolve_stack_addr(content))
def print_stack(lines, resolver):
print("stack:")
for line in lines:
for content in line.content:
out = resolver.resolve_stack_addr(content, full=False)
if out is None:
continue
print(out)
def print_result(parser, resolver, platform, full=True, stack_only=False):
if platform == 'ESP8266' and not stack_only:
print('Exception: {} ({})'.format(parser.exception, EXCEPTIONS[parser.exception]))
print("")
print_addr("epc1", parser.epc1, resolver)
print_addr("epc2", parser.epc2, resolver)
print_addr("epc3", parser.epc3, resolver)
print_addr("excvaddr", parser.excvaddr, resolver)
print_addr("depc", parser.depc, resolver)
print("")
print("ctx: " + parser.ctx)
print("")
print_addr("sp", parser.sp, resolver)
print_addr("end", parser.end, resolver)
print_addr("offset", parser.offset, resolver)
print("")
if full:
print_stack_full(parser.stack, resolver)
else:
print_stack(parser.stack, resolver)
def parse_args():
parser = argparse.ArgumentParser(description="decode ESP Stacktraces.")
parser.add_argument("-p", "--platform", help="The platform to decode from", choices=PLATFORMS.keys(),
default="ESP32")
parser.add_argument("-t", "--tool", help="Path to the xtensa toolchain",
default="~/.platformio/packages/toolchain-xtensa32/")
parser.add_argument("-e", "--elf", help="path to elf file",
default=".pio/build/esp32/firmware.elf")
parser.add_argument("-f", "--full", help="Print full stack dump", action="store_true")
parser.add_argument("-s", "--stack_only", help="Decode only a stractrace", action="store_true")
parser.add_argument("file", help="The file to read the exception data from ('-' for STDIN)", default="-")
return parser.parse_args()
if __name__ == "__main__":
args = parse_args()
if args.file == "-":
file = sys.stdin
else:
if not os.path.exists(args.file):
print("ERROR: file " + args.file + " not found")
sys.exit(1)
file = open(args.file, "r")
addr2line = os.path.join(os.path.abspath(os.path.expanduser(args.tool)),
"bin/xtensa-" + PLATFORMS[args.platform] + "-elf-addr2line")
if os.name == 'nt':
addr2line += '.exe'
if not os.path.exists(addr2line):
print("ERROR: addr2line not found (" + addr2line + ")")
elf_file = os.path.abspath(os.path.expanduser(args.elf))
if not os.path.exists(elf_file):
print("ERROR: elf file not found (" + elf_file + ")")
parser = ExceptionDataParser()
resolver = AddressResolver(addr2line, elf_file)
parser.parse_file(file, args.platform, args.stack_only)
resolver.fill(parser)
print_result(parser, resolver, args.platform, args.full, args.stack_only)