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import json
import importlib
import traceback
import sys
import os
import pic16
import pic18
import pic24
running = True
DEBUG = False
ANSI_BLUE = "\x1b[34m"
ANSI_YELLOW = "\x1b[33m"
ANSI_DARK_GREEN = "\x1b[32m"
ANSI_GREEN = "\x1b[1m\x1b[32m"
ANSI_RED = "\x1b[31m"
ANSI_RESET = "\x1b[0m"
COLOR_REGISTER = ANSI_YELLOW
COLOR_FUNCTION = ANSI_GREEN
COLOR_LABEL = ANSI_DARK_GREEN
COLOR_ADDRESS = ANSI_DARK_GREEN
state = {
'running': True,
'dirty': False
}
def parse_parts(msg):
parts = []
i = 0
wordstart = 0
word = ""
stripped = msg.strip()
in_quotes = False
escaping = False
while i < len(stripped):
if escaping:
# escaping means even spaces aren't the end of the word, so
word = word + stripped[i]
escaping = False
else:
if stripped[i] == ' ':
if in_quotes:
# this isn't actually the end of a word
word = word + stripped[i]
else:
parts.append(word)
word = ""
elif stripped[i] == '\\':
escaping = True
elif stripped[i] == '"':
in_quotes = not in_quotes
else:
word = word + stripped[i]
i = i + 1
parts.append(word)
word = ""
# todo: signal unmatched quotes
return parts
def readnum(s):
if s.startswith("0x"):
return int(s[2:], 16)
else:
return int(s)
def parse_cmd(cmd):
cmd_parts = parse_parts(cmd)
smol_to_big = {
"o": "open",
"c": "define-comment",
"c+": "define-comment",
"q": "quit",
"d": "disassemble",
"h": "help"
}
result = {}
if len(cmd_parts) > 0:
result['type'] = cmd_parts[0]
if result['type'] in smol_to_big:
result['type'] = smol_to_big[result['type']]
result['params'] = cmd_parts[1:]
result['raw_text'] = cmd
if len(cmd_parts) > 1 and cmd_parts[-1][0] == '@':
result['where'] = resolve_addr(cmd_parts[-1][1:], state)
elif len(cmd_parts) > 2 and cmd_parts[-2] == '@':
result['where'] = resolve_addr(cmd_parts[-1], state)
if 'where' in result and result['where'] is None:
result['invalid'] = True
return result
def resolve_addr(where, state):
# where may be the name of a label or function
if where in state['notes']['functions-reverse']:
return state['notes']['functions-reverse'][where]
elif where in state['notes']['labels-reverse']:
return state['notes']['labels-reverse'][where]
else:
# if it's not there, it better be a number...
try:
return readnum(where)
except ValueError:
print("{} is not a known function or label.".format(where))
def do_help(cmd, state):
print("haha, help")
def do_open(cmd, state):
f = open(cmd['params'][0])
buf = f.read(6)
f.close()
if buf == ":02000":
return do_openhex(cmd, state)
else:
return do_openbin(cmd, state)
def do_openbin(cmd, state):
return inneropen(cmd, state, lambda x: { 0: x.read() })
def do_openhex(cmd, state):
return inneropen(cmd, state, lambda x: read_hex(x))
def read_hex(f):
lines = f.readlines()
regions = { 0: [] }
curr_region = regions[0]
for line in lines:
if not line.startswith(':'):
continue
# raise Exception("invalid hex line, needs to start with a ':', but was: " + line)
bytecount = int(line[1:3], 16)
addr = int(line[3:7], 16)
rec_type = int(line[7:9], 16)
data_end = bytecount * 2 + 9
data = line[9:data_end]
# ignoring checksum because lazy
if rec_type == 4:
ext_linear_addr = int(data, 16)
if ext_linear_addr not in regions:
regions[ext_linear_addr] = []
curr_region = regions[ext_linear_addr]
elif rec_type == 0:
for i in range(bytecount):
if len(curr_region) <= addr + i:
curr_region.extend([0] * (1 + addr + i - len(curr_region)))
curr_region[addr + i] = int(data[i*2:i*2 + 2], 16)
elif rec_type == 1:
if DEBUG:
print("Read HEX file ({} regions)".format(len(regions)))
return regions
else:
raise Exception("Unsupported record type: " + str(rec_type))
def do_goto(cmd, state):
try:
dest = int(cmd['params'][0])
except ValueError:
# parse error, might be a function or label!
# labels first...
name = cmd['params'][0]
if name in state['notes']['labels-reverse']:
dest = state['notes']['labels-reverse'][name]
if name in state['notes']['functions-reverse']:
dest = state['notes']['functions-reverse'][name]
state['cursor'] = int(cmd['params'][0])
def do_goto_bank(cmd, state):
param = cmd['params'][0]
if not param in state['all-regions']:
state['all-regions'][param] = []
state['data'] = state['all-regions'][param]
def inneropen(cmd, state, readfn):
newfile = cmd['params'][0]
if os.path.isfile(newfile):
newdata = None
try:
f = open(newfile)
newdata = readfn(f)
f.close()
except Exception as e:
print("Failed to open new file: {}".format(newfile))
print("Got: {}".format(e))
print(traceback.format_exc())
return
state['notes'] = {
'comments': {},
'functions': {},
'functions-reverse': {},
'labels': {},
'labels-reverse': {}
}
state['cursor'] = 0
state['file'] = newfile
state['all-regions'] = newdata
state['selected-region'] = newdata.keys()[0]
state['data'] = newdata[state['selected-region']]
elif os.path.isdir(newfile):
print("Cannot open {}, it is a directory".format(newfile))
else:
print("File {} does not exist".format(newfile))
if 'arch-name' not in state or state['arch-name'] is None:
# default arch to the best cpu, pic16
do_setarch({ 'params': ['pic16'] }, state)
if DEBUG:
print("Opened {} as {}".format(newfile, state['arch-name']))
def do_comment(cmd, state):
state['notes']['comments'][cmd['where']] = cmd['params'][0]
state['dirty'] = True
def new_function(name):
return {
"name": name,
"params": None,
"returns": None
}
def do_undefine_function(cmd, state):
name = cmd['params'][0]
if cmd['params'][0] in state['notes']['functions-reverse']:
fnaddr = state['notes']['functions-reverse'][cmd['params'][0]]
del state['notes']['functions'][fnaddr]
del state['notes']['functions-reverse'][name]
return
else:
print("Function {} is not defined".format(name))
def do_define_function(cmd, state):
if cmd['params'][0] in state['notes']['functions-reverse']:
fnaddr = state['notes']['functions-reverse'][cmd['params'][0]]
if fnaddr != cmd['where']:
print("Function {} is already defined at {}".format(cmd['params'][0], fnaddr))
return
else:
newname = cmd['params'][0]
fn = state['notes']['functions'][cmd['where']]
del state['notes']['functions-reverse'][fn['name']]
state['notes']['functions-reverse'][newname] = fn
fn['name'] = newname
else:
state['notes']['functions'][cmd['where']] = new_function(cmd['params'][0])
state['notes']['functions-reverse'][cmd['params'][0]] = cmd['where']
state['dirty'] = True
def do_define_label(cmd, state):
state['notes']['labels'][cmd['where']] = cmd['params'][0]
state['notes']['labels-reverse'][cmd['params'][0]] = cmd['where']
state['dirty'] = True
def colorize(string, color):
return "{}{}{}".format(
color,
string,
ANSI_RESET
)
def do_disassemble(cmd, state):
if 'data' not in state:
print("No file currently open")
return
if 'cursor' not in state:
print("No cursor into the file (this is a bug - a file must be open?")
return
if 'where' in cmd:
where = cmd['where']
else:
where = state['cursor']
if len(cmd['params']) > 0:
count = int(cmd['params'][0])
else:
count = 1
arch = state['arch']
try:
disassembled = 0
while disassembled < count:
prewhere = where
(where, instr) = arch.disassemble(state['data'], where)
if 'ops' in instr:
newops = instr['ops']
for i, op in enumerate(instr['ops']):
if isinstance(op, dict) and 'type' in op:
note = None
if op['type'] == "absolutedest":
if op['value'] in state['notes']['functions']:
note = state['notes']['functions'][op['value']]['name']
note = colorize(note, COLOR_FUNCTION)
elif op['value'] in state['notes']['labels']:
note = state['notes']['labels'][op['value']]
note = colorize(note, COLOR_LABEL)
else:
note = colorize(hex(op['value']), COLOR_ADDRESS)
elif op['type'] == "relpostdest":
# if there's a thing there replace with it
newops[i] = "relpostdest"
ea = prewhere + instr['length'] * 2 + op['value']
if ea in state['notes']['functions']:
note = state['notes']['functions'][ea]['name']
note = colorize(note, COLOR_FUNCTION)
elif ea in state['notes']['labels']:
note = state['notes']['labels'][ea]
note = colorize(note, COLOR_LABEL)
else:
note = "0x{:x} (ip+2{}{})".format(
ea,
"+" if op['value'] >= 0 else "",
hex(op['value'])
)
note = colorize(note, COLOR_ADDRESS)
elif op['type'] == "relpredest":
pass
elif op['type'] == "register" or op['type'] == "banked-register":
nicename = arch.reg_name(op['value'])
if nicename is None:
if isinstance(op['value'], str):
note = op['value']
else:
note = hex(op['value'])
else:
note = nicename
note = colorize(note, COLOR_REGISTER)
if not note is None:
newops[i] = str(note)
instr['ops'] = newops
prefix = None
if prewhere in state['notes']['functions']:
fn = state['notes']['functions'][prewhere]
prefix = colorize(
"{:08x}> start of {}\n".format(prewhere, fn['name']),
COLOR_FUNCTION
)
elif prewhere in state['notes']['labels']:
label = state['notes']['labels'][prewhere]
prefix = colorize(
"{:08x}: {}\n".format(prewhere, label),
COLOR_LABEL
)
instrstring = arch.render(instr)
to_show = "{:08x}: {}".format(prewhere, instrstring)
if prewhere in state['notes']['comments']:
to_show = "{: <35} {}; {}{}".format(
to_show,
ANSI_BLUE,
state['notes']['comments'][prewhere],
ANSI_RESET
)
if not prefix is None:
to_show = prefix + to_show
print(to_show)
disassembled = disassembled + 1
except Exception as e:
print("Exception while disassembling: {}".format(e))
print(traceback.format_exc())
def do_setarch(cmd, state):
try:
loaded_arch = importlib.import_module(cmd['params'][0])
except ImportError:
print("Cannot find module for arch '{}'".format(cmd['params'][0]))
except Exception as e:
print("General error loading '{}': {}".format(cmd['params'][0], e))
state['arch-name'] = cmd['params'][0]
state['arch'] = loaded_arch
def dict_from_file(path):
f = open(path)
result = json.loads(f.read())
f.close()
return result
def dict_to_file(path, data):
f = open(path, 'w')
f.write(json.dumps(data, sort_keys=True, indent=2))
f.close()
# so json.dumps turns numeric keys into strings.
# this breaks some dictionaries.
def fix_keys(obj):
redo = []
for k in obj:
try:
knum = int(k)
redo.append(k)
except ValueError:
pass
for k in redo:
knum = int(k)
obj[knum] = obj[k]
del obj[k]
def do_loaddb(cmd, state):
if len(cmd['params']) == 0:
if 'file' in state:
dbpath = state['file'] + '.nrt'
else:
print("No db path provided nor file loaded - I don't know what to load!")
return
else:
dbpath = cmd['params'][0]
if os.path.isdir(dbpath) and os.path.isdir(dbpath + '/.git'):
if DEBUG:
print("Loading {} ...".format(dbpath))
try:
dbroot = dict_from_file(dbpath + '/root.json')
do_setarch({ "params": [dbroot['arch-name']] }, state)
state['notes']['comments'] = dict_from_file(dbpath + '/comments.json')
fix_keys(state['notes']['comments'])
state['notes']['functions'] = dict_from_file(dbpath + '/functions.json')
state['notes']['functions-reverse'] = dict_from_file(dbpath + '/functions-reverse.json')
fix_keys(state['notes']['functions'])
state['notes']['labels'] = dict_from_file(dbpath + '/labels.json')
state['notes']['labels-reverse'] = dict_from_file(dbpath + '/labels-reverse.json')
fix_keys(state['notes']['labels'])
state['default-dbpath'] = dbpath
# check db file path matches current file path?
if DEBUG:
print("wow you're really using this, huh?")
except Exception as e:
print("Error loading db: {}".format(e))
elif os.path.isdir(dbpath):
print("Cannot load {}, there is no repository there".format(dbpath))
elif os.path.isfile(dbpath):
print("Cannot load {}, it is a file".format(dbpath))
else:
print("Cannot load {}, it does not exist".format(dbpath))
def do_savedb(cmd, state):
if len(cmd['params']) > 0:
dbpath = cmd['params'][0]
elif 'default-dbpath' in state:
dbpath = state['default-dbpath']
else:
dbpath = state['file'] + '.nrt'
if os.path.isfile(dbpath):
print("File is present, but should be a directory. Cannot save.")
return
elif os.path.isdir(dbpath):
if not os.path.isdir(dbpath + '/.git'):
print("dbpath is a directory, but there is no git repo there. Opting to not save.")
return
else:
# dbpath exists, and there's a git repo there, we can proceed
pass
else:
# none of the directories exist, so we can start fresh
os.mkdir(dbpath)
# TODO: pray the input filename doesn't have a ' in it i guess
os.system('cd \'{}\' && git init'.format(dbpath))
to_save = {}
to_save['arch-name'] = state['arch-name']
dict_to_file(dbpath + '/root.json', to_save)
dict_to_file(dbpath + '/comments.json', state['notes']['comments'])
dict_to_file(dbpath + '/functions.json', state['notes']['functions'])
dict_to_file(dbpath + '/functions-reverse.json', state['notes']['functions-reverse'])
dict_to_file(dbpath + '/labels.json', state['notes']['labels'])
dict_to_file(dbpath + '/labels-reverse.json', state['notes']['labels-reverse'])
os.system('cd \'{}\' && git add . && git commit -m "automatic save"'.format(dbpath))
state['dirty'] = False
def do_quit(cmd, state):
# prompt before saving
if not 'dirty' in state or state['dirty']:
do_savedb({ "params": [] }, state)
state['running'] = False
def do_sh(cmd, state):
if len(cmd['params']) == 1:
os.system(cmd['params'][0])
else:
print("sh expects exactly one argument (may be a string)")
def do_info(cmd, state):
if 'file' in state:
print("File: {}".format(state['file']))
print("Regions:")
keys = state['all-regions'].keys()
keys.sort()
for key in keys:
print(" {}{}: {} bytes".format(
'*' if key == state['selected-region'] else ' ',
key,
hex(len(state['all-regions'][key]))
))
def readnum(string):
if string.startswith('0x'):
return int(string, 16)
else:
return int(string)
def do_list_comments(cmd, state):
print("Comments:")
for l in state['notes']['comments']:
print("{}: 0x{:x}".format(state['notes']['comments'][l], l))
def do_list_functions(cmd, state):
print("Functions:")
for l in state['notes']['functions']:
print("{}: 0x{:x}".format(state['notes']['functions'][l]['name'], l))
def do_list_labels(cmd, state):
print("Labels:")
for l in state['notes']['labels']:
print("{}: 0x{:x}".format(state['notes']['labels'][l], l))
def do_hexprint(cmd, state):
count = readnum(cmd['params'][0])
start = cmd['where']
idx = start
while count > idx - start:
sys.stdout.write("{:08x}: ".format(idx))
for i in range(16):
if count <= idx - start:
break
sys.stdout.write("{:02x} ".format(state['data'][idx]),)
idx = idx + 1
sys.stdout.write('\n')
cmdmap = {
"px": do_hexprint,
"define-comment": do_comment,
"define-function": do_define_function,
"undefine-function": do_undefine_function,
"define-label": do_define_label,
"list-comments": do_list_comments,
"list-functions": do_list_functions,
"list-labels": do_list_labels,
"open": do_open,
"openhex": do_openhex,
"arch": do_setarch,
"disassemble": do_disassemble,
"loaddb": do_loaddb,
"savedb": do_savedb,
"quit": do_quit,
"help": do_help,
"info": do_info,
"goto": do_goto,
"goto-bank": do_goto_bank,
"sh": do_sh
}
def do_cmd_thing(cmd, state):
if 'invalid' in cmd:
pass # can't do anything with it.
elif cmd['type'] in cmdmap:
cmdmap[cmd['type']](cmd, state)
else:
print("I don't recognize the command `{}`".format(cmd['raw_text']))
for i, arg in enumerate(sys.argv):
# just the path of this script
# i bet that only applies because i'm running as
# `python pydare.py ...`
if i == 0:
continue
do_cmd_thing(parse_cmd(arg), state)
# if len(sys.argv) > 1:
# do_open({"params": [sys.argv[1]]}, state)
# if len(sys.argv) > 2:
# do_setarch({"params": [sys.argv[2]]}, state)
import readline
readline.parse_and_bind("")
if os.path.isfile(".pydare_history"):
readline.read_history_file(".pydare_history")
while state['running']:
try:
do_cmd_thing(parse_cmd(raw_input("> ")), state)
except Exception as e:
print("Unhandled exception: {}".format(e))
print(traceback.format_exc())
if not os.path.isdir(".pydare_history"):
readline.write_history_file(".pydare_history")
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