Adding exception decoder
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decoder.py
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307
decoder.py
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#!/usr/bin/env python3
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"""ESP Exception Decoder
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github: https://github.com/janLo/EspArduinoExceptionDecoder
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license: GPL v3
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author: Jan Losinski
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"""
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import argparse
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import re
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import subprocess
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from collections import namedtuple
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import sys
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import os
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EXCEPTIONS = [
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"Illegal instruction",
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"SYSCALL instruction",
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"InstructionFetchError: Processor internal physical address or data error during instruction fetch",
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"LoadStoreError: Processor internal physical address or data error during load or store",
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"Level1Interrupt: Level-1 interrupt as indicated by set level-1 bits in the INTERRUPT register",
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"Alloca: MOVSP instruction, if caller's registers are not in the register file",
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"IntegerDivideByZero: QUOS, QUOU, REMS, or REMU divisor operand is zero",
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"reserved",
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"Privileged: Attempt to execute a privileged operation when CRING ? 0",
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"LoadStoreAlignmentCause: Load or store to an unaligned address",
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"reserved",
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"reserved",
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"InstrPIFDataError: PIF data error during instruction fetch",
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"LoadStorePIFDataError: Synchronous PIF data error during LoadStore access",
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"InstrPIFAddrError: PIF address error during instruction fetch",
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"LoadStorePIFAddrError: Synchronous PIF address error during LoadStore access",
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"InstTLBMiss: Error during Instruction TLB refill",
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"InstTLBMultiHit: Multiple instruction TLB entries matched",
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"InstFetchPrivilege: An instruction fetch referenced a virtual address at a ring level less than CRING",
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"reserved",
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"InstFetchProhibited: An instruction fetch referenced a page mapped with an attribute that does not permit instruction fetch",
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"reserved",
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"reserved",
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"reserved",
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"LoadStoreTLBMiss: Error during TLB refill for a load or store",
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"LoadStoreTLBMultiHit: Multiple TLB entries matched for a load or store",
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"LoadStorePrivilege: A load or store referenced a virtual address at a ring level less than CRING",
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"reserved",
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"LoadProhibited: A load referenced a page mapped with an attribute that does not permit loads",
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"StoreProhibited: A store referenced a page mapped with an attribute that does not permit stores"
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]
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PLATFORMS = {
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"ESP8266": "lx106",
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"ESP32": "esp32"
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}
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EXCEPTION_REGEX = re.compile("^Exception \\((?P<exc>[0-9]*)\\):$")
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COUNTER_REGEX = re.compile('^epc1=(?P<epc1>0x[0-9a-f]+) epc2=(?P<epc2>0x[0-9a-f]+) epc3=(?P<epc3>0x[0-9a-f]+) '
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'excvaddr=(?P<excvaddr>0x[0-9a-f]+) depc=(?P<depc>0x[0-9a-f]+)$')
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CTX_REGEX = re.compile("^ctx: (?P<ctx>.+)$")
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POINTER_REGEX = re.compile('^sp: (?P<sp>[0-9a-f]+) end: (?P<end>[0-9a-f]+) offset: (?P<offset>[0-9a-f]+)$')
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STACK_BEGIN = '>>>stack>>>'
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STACK_END = '<<<stack<<<'
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STACK_REGEX = re.compile(
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'^(?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.*)?$')
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StackLine = namedtuple("StackLine", ["offset", "content"])
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class ExceptionDataParser(object):
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def __init__(self):
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self.exception = None
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self.epc1 = None
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self.epc2 = None
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self.epc3 = None
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self.excvaddr = None
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self.depc = None
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self.ctx = None
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self.sp = None
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self.end = None
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self.offset = None
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self.stack = []
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def _parse_exception(self, line):
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match = EXCEPTION_REGEX.match(line)
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if match is not None:
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self.exception = int(match.group('exc'))
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return self._parse_counters
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return self._parse_exception
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def _parse_counters(self, line):
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match = COUNTER_REGEX.match(line)
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if match is not None:
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self.epc1 = match.group("epc1")
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self.epc2 = match.group("epc2")
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self.epc3 = match.group("epc3")
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self.excvaddr = match.group("excvaddr")
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self.depc = match.group("depc")
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return self._parse_ctx
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return self._parse_counters
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def _parse_ctx(self, line):
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match = CTX_REGEX.match(line)
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if match is not None:
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self.ctx = match.group("ctx")
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return self._parse_pointers
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return self._parse_ctx
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def _parse_pointers(self, line):
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match = POINTER_REGEX.match(line)
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if match is not None:
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self.sp = match.group("sp")
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self.end = match.group("end")
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self.offset = match.group("offset")
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return self._parse_stack_begin
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return self._parse_pointers
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def _parse_stack_begin(self, line):
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if line == STACK_BEGIN:
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return self._parse_stack_line
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return self._parse_stack_begin
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def _parse_stack_line(self, line):
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if line != STACK_END:
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match = STACK_REGEX.match(line)
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if match is not None:
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self.stack.append(StackLine(offset=match.group("off"),
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content=(match.group("c1"), match.group("c2"), match.group("c3"),
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match.group("c4"))))
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return self._parse_stack_line
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return None
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def parse_file(self, file, stack_only=False):
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func = self._parse_exception
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if stack_only:
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func = self._parse_stack_begin
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for line in file:
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func = func(line.strip())
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if func is None:
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break
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if func is not None:
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print("ERROR: Parser not complete!")
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sys.exit(1)
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class AddressResolver(object):
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def __init__(self, tool_path, elf_path):
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self._tool = tool_path
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self._elf = elf_path
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self._address_map = {}
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def _lookup(self, addresses):
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cmd = [self._tool, "-aipfC", "-e", self._elf] + [addr for addr in addresses if addr is not None]
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if sys.version_info[0] < 3:
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output = subprocess.check_output(cmd)
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else:
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output = subprocess.check_output(cmd, encoding="utf-8")
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line_regex = re.compile("^(?P<addr>[0-9a-fx]+): (?P<result>.+)$")
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last = None
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for line in output.splitlines():
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line = line.strip()
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match = line_regex.match(line)
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if match is None:
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if last is not None and line.startswith('(inlined by)'):
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line = line [12:].strip()
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self._address_map[last] += ("\n \-> inlined by: " + line)
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continue
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if match.group("result") == '?? ??:0':
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continue
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self._address_map[match.group("addr")] = match.group("result")
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last = match.group("addr")
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def fill(self, parser):
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addresses = [parser.epc1, parser.epc2, parser.epc3, parser.excvaddr, parser.sp, parser.end, parser.offset]
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for line in parser.stack:
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addresses.extend(line.content)
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self._lookup(addresses)
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def _sanitize_addr(self, addr):
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if addr.startswith("0x"):
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addr = addr[2:]
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fill = "0" * (8 - len(addr))
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return "0x" + fill + addr
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def resolve_addr(self, addr):
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out = self._sanitize_addr(addr)
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if out in self._address_map:
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out += ": " + self._address_map[out]
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return out
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def resolve_stack_addr(self, addr, full=True):
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addr = self._sanitize_addr(addr)
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if addr in self._address_map:
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return addr + ": " + self._address_map[addr]
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if full:
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return "[DATA (0x" + addr + ")]"
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return None
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def print_addr(name, value, resolver):
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print("{}:{} {}".format(name, " " * (8 - len(name)), resolver.resolve_addr(value)))
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def print_stack_full(lines, resolver):
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print("stack:")
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for line in lines:
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print(line.offset + ":")
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for content in line.content:
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print(" " + resolver.resolve_stack_addr(content))
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def print_stack(lines, resolver):
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print("stack:")
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for line in lines:
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for content in line.content:
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out = resolver.resolve_stack_addr(content, full=False)
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if out is None:
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continue
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print(out)
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def print_result(parser, resolver, full=True, stack_only=False):
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if not stack_only:
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print('Exception: {} ({})'.format(parser.exception, EXCEPTIONS[parser.exception]))
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print("")
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print_addr("epc1", parser.epc1, resolver)
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print_addr("epc2", parser.epc2, resolver)
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print_addr("epc3", parser.epc3, resolver)
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print_addr("excvaddr", parser.excvaddr, resolver)
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print_addr("depc", parser.depc, resolver)
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print("")
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print("ctx: " + parser.ctx)
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print("")
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print_addr("sp", parser.sp, resolver)
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print_addr("end", parser.end, resolver)
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print_addr("offset", parser.offset, resolver)
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print("")
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if full:
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print_stack_full(parser.stack, resolver)
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else:
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print_stack(parser.stack, resolver)
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def parse_args():
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parser = argparse.ArgumentParser(description="decode ESP Stacktraces.")
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parser.add_argument("-p", "--platform", help="The platform to decode from", choices=PLATFORMS.keys(),
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default="ESP8266")
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parser.add_argument("-t", "--tool", help="Path to the xtensa toolchain",
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default="~/.platformio/packages/toolchain-xtensa/")
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parser.add_argument("-e", "--elf", help="path to elf file", required=True)
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parser.add_argument("-f", "--full", help="Print full stack dump", action="store_true")
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parser.add_argument("-s", "--stack_only", help="Decode only a stractrace", action="store_true")
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parser.add_argument("file", help="The file to read the exception data from ('-' for STDIN)", default="-")
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return parser.parse_args()
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if __name__ == "__main__":
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args = parse_args()
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if args.file == "-":
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file = sys.stdin
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else:
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if not os.path.exists(args.file):
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print("ERROR: file " + args.file + " not found")
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sys.exit(1)
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file = open(args.file, "r")
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addr2line = os.path.join(os.path.abspath(os.path.expanduser(args.tool)),
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"bin/xtensa-" + PLATFORMS[args.platform] + "-elf-addr2line")
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if not os.path.exists(addr2line):
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print("ERROR: addr2line not found (" + addr2line + ")")
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elf_file = os.path.abspath(os.path.expanduser(args.elf))
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if not os.path.exists(elf_file):
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print("ERROR: elf file not found (" + elf_file + ")")
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parser = ExceptionDataParser()
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resolver = AddressResolver(addr2line, elf_file)
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parser.parse_file(file, args.stack_only)
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resolver.fill(parser)
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print_result(parser, resolver, args.full, args.stack_only)
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