ref: 0eb28d0e6735d9fdc1074a15ac487accf6d40032
dir: /extras/romstr.py/
import sys, os, time, datetime, json
from gbz80disasm import opt_table
from ctypes import c_int8
from copy import copy, deepcopy
from labels import get_label_from_line, get_address_from_line_comment
relative_jumps = [0x38, 0x30, 0x20, 0x28, 0x18, 0xc3, 0xda, 0xc2, 0x32]
relative_unconditional_jumps = [0xc3, 0x18]
call_commands = [0xdc, 0xd4, 0xc4, 0xcc, 0xcd]
end_08_scripts_with = [
0xe9, # jp hl
0xc9, # ret
] # possibly also:
# 0xc3, # jp
# 0xc18, # jr
# 0xda, 0xe9, 0xd2, 0xc2, 0xca, 0x38, 0x30, 0x20, 0x28, 0x18, 0xd8,
# 0xd0, 0xc0, 0xc8, 0xc9
spacing = "\t"
class RomStr(str):
""" Simple wrapper to prevent a giant rom from being shown on screen.
"""
def __init__(self, *args, **kwargs):
if "labels" in kwargs.keys() and kwargs["labels"] == True:
self.load_labels()
str.__init__(self)
def __repr__(self):
""" Simplifies this object so that the output doesn't overflow stdout.
"""
return "RomStr(too long)"
@classmethod
def load(cls, crystal=True, red=False):
""" Loads a ROM into a RomStr.
"""
if crystal and not red:
file_handler = open("../baserom.gbc", "r")
elif red and not crystal:
file_handler = open("../pokered-baserom.gbc", "r")
else:
raise Exception, "not sure which rom to load?"
bytes = file_handler.read()
file_handler.close()
return RomStr(bytes)
def load_labels(self, filename="labels.json"):
""" Loads labels from labels.json, or parses the source code file and
generates new labels.
"""
filename = os.path.join(os.path.dirname(__file__), filename)
# blank out the hash
self.labels = {}
# check if the labels file exists
file_existence = os.path.exists(filename)
generate_labels = False
# determine if the labels file needs to be regenerated
if file_existence:
modified = os.path.getmtime(filename)
modified = datetime.datetime.fromtimestamp(modified)
current = datetime.datetime.fromtimestamp(time.time())
is_old = (current - modified) > datetime.timedelta(days=3)
if is_old:
generate_labels = True
else:
generate_labels = True
# scan the asm source code for labels
if generate_labels:
asm = open(os.path.join(os.path.dirname(__file__), "../main.asm"), "r").read().split("\n")
for line in asm:
label = get_label_from_line(line)
if label:
address = get_address_from_line_comment(line)
self.labels[address] = label
content = json.dumps(self.labels)
file_handler = open(filename, "w")
file_handler.write(content)
file_handler.close()
# load the labels from the file
self.labels = json.loads(open(filename, "r").read())
def get_address_for(self, label):
""" Returns the address of a label. This is slow and could be improved
dramatically.
"""
label = str(label)
for address in self.labels.keys():
if self.labels[address] == label:
return address
return None
def length(self):
""" len(self)
"""
return len(self)
def len(self):
""" len(self)
"""
return self.length()
def interval(self, offset, length, strings=True, debug=True):
""" returns hex values for the rom starting at offset until
offset+length
"""
returnable = []
for byte in self[offset:offset+length]:
if strings:
returnable.append(hex(ord(byte)))
else:
returnable.append(ord(byte))
return returnable
def until(self, offset, byte, strings=True, debug=False):
""" Returns hex values from rom starting at offset until the given
byte.
"""
return self.interval(offset, self.find(chr(byte), offset) - offset, strings=strings)
def to_asm(self, address, end_address=None, size=None, max_size=0x4000, debug=None):
""" Disassembles ASM at some address. This will stop disassembling when
either the end_address or size is met. Also, there's a maximum size
that will be parsed, so that large patches of data aren't parsed as
code.
"""
if type(address) == str and "0x" in address:
address = int(address, 16)
start_address = address
if start_address == None:
raise Exception, "address must be given"
if debug == None:
if not hasattr(self, "debug"):
debug = False
else:
debug = self.debug
# this is probably a terrible idea.. why am i doing this?
if size != None and max_size < size:
raise Exception, "max_size must be greater than or equal to size"
elif end_address != None and (end_address - start_address) > max_size:
raise Exception, "end_address is out of bounds"
elif end_address != None and size != None:
if (end_address - start_address) >= size:
size = end_address - start_address
else:
end_address = start_address + size
elif end_address == None and size != None:
end_address = start_address + size
elif end_address != None and size == None:
size = end_address - start_address
return DisAsm(start_address=start_address, end_address=end_address, size=size, max_size=max_size, debug=debug, rom=self)
class DisAsm:
""" z80 disassembler
"""
def __init__(self, start_address=None, end_address=None, size=None, max_size=0x4000, debug=True, rom=None):
assert start_address != None, "start_address must be given"
if rom == None:
file_handler = open("../baserom.gbc", "r")
bytes = file_handler.read()
file_handler.close()
rom = RomStr(bytes)
if debug not in [None, True, False]:
raise Exception, "debug param is invalid"
if debug == None:
debug = False
# get end_address and size in sync with each other
if end_address == None and size != None:
end_address = start_address + size
elif end_address != None and size == None:
size = end_address - start_address
elif end_address != None and size != None:
size = max(end_address - start_address, size)
end_address = start_address + size
# check that the bounds make sense
if end_address != None:
if end_address <= start_address:
raise Exception, "end_address is out of bounds"
elif (end_address - start_address) > max_size:
raise Exception, "end_address goes beyond max_size"
# check more edge cases
if not start_address >= 0:
raise Exception, "start_address must be at least 0"
elif end_address != None and not end_address >= 0:
raise Exception, "end_address must be at least 0"
self.rom = rom
self.start_address = start_address
self.end_address = end_address
self.size = size
self.max_size = max_size
self.debug = debug
self.parse()
def parse(self):
""" Disassembles stuff and things.
"""
rom = self.rom
start_address = self.start_address
end_address = self.end_address
max_size = self.max_size
debug = self.debug
bank_id = start_address / 0x4000
# [{"command": 0x20, "bytes": [0x20, 0x40, 0x50],
# "asm": "jp $5040", "label": "Unknown5040"}]
asm_commands = {}
offset = start_address
last_hl_address = None
last_a_address = None
used_3d97 = False
keep_reading = True
while (end_address != 0 and offset <= end_address) or keep_reading:
# read the current opcode byte
current_byte = ord(rom[offset])
current_byte_number = len(asm_commands.keys())
# setup this next/upcoming command
if offset in asm_commands.keys():
asm_command = asm_commands[offset]
else:
asm_command = {}
asm_command["address"] = offset
if not "references" in asm_command.keys():
# This counts how many times relative jumps reference this
# byte. This is used to determine whether or not to print out a
# label later.
asm_command["references"] = 0
# some commands have two opcodes
next_byte = ord(rom[offset+1])
if self.debug:
print "offset: \t\t" + hex(offset)
print "current_byte: \t\t" + hex(current_byte)
print "next_byte: \t\t" + hex(next_byte)
# all two-byte opcodes also have their first byte in there somewhere
if (current_byte in opt_table.keys()) or ((current_byte + (next_byte << 8)) in opt_table.keys()):
# this might be a two-byte opcode
possible_opcode = current_byte + (next_byte << 8)
# check if this is a two-byte opcode
if possible_opcode in opt_table.keys():
op_code = possible_opcode
else:
op_code = current_byte
op = opt_table[op_code]
opstr = op[0].lower()
optype = op[1]
if self.debug:
print "opstr: " + opstr
asm_command["type"] = "op"
asm_command["id"] = op_code
asm_command["format"] = opstr
asm_command["opnumberthing"] = optype
opstr2 = None
base_opstr = copy(opstr)
if "x" in opstr:
for x in range(0, opstr.count("x")):
insertion = ord(rom[offset + 1])
# Certain opcodes will have a local relative jump label
# here instead of a raw hex value, but this is
# controlled through asm output.
insertion = "$" + hex(insertion)[2:]
opstr = opstr[:opstr.find("x")].lower() + insertion + opstr[opstr.find("x")+1:].lower()
if op_code in relative_jumps:
target_address = offset + 2 + c_int8(ord(rom[offset + 1])).value
insertion = "asm_" + hex(target_address)
if str(target_address) in self.rom.labels.keys():
insertion = self.rom.labels[str(target_address)]
opstr2 = base_opstr[:base_opstr.find("x")].lower() + insertion + base_opstr[base_opstr.find("x")+1:].lower()
asm_command["formatted_with_labels"] = opstr2
asm_command["target_address"] = target_address
current_byte_number += 1
offset += 1
if "?" in opstr:
for y in range(0, opstr.count("?")):
byte1 = ord(rom[offset + 1])
byte2 = ord(rom[offset + 2])
number = byte1
number += byte2 << 8;
# In most cases, you can use a label here. Labels will
# be shown during asm output.
insertion = "$%.4x" % (number)
opstr = opstr[:opstr.find("?")].lower() + insertion + opstr[opstr.find("?")+1:].lower()
# This version of the formatted string has labels. In
# the future, the actual labels should be parsed
# straight out of the "main.asm" file.
target_address = number % 0x4000
insertion = "asm_" + hex(target_address)
if str(target_address) in self.rom.labels.keys():
insertion = self.rom.labels[str(target_address)]
opstr2 = base_opstr[:base_opstr.find("?")].lower() + insertion + base_opstr[base_opstr.find("?")+1:].lower()
asm_command["formatted_with_labels"] = opstr2
asm_command["target_address"] = target_address
current_byte_number += 2
offset += 2
# Check for relative jumps, construct the formatted asm line.
# Also set the usage of labels.
if current_byte in [0x18, 0x20] + relative_jumps: # jr or jr nz
# generate a label for the byte we're jumping to
target_address = offset + 1 + c_int8(ord(rom[offset])).value
if target_address in asm_commands.keys():
asm_commands[target_address]["references"] += 1
remote_label = "asm_" + hex(target_address)
asm_commands[target_address]["current_label"] = remote_label
asm_command["remote_label"] = remote_label
# Not sure how to set this, can't be True because an
# address referenced multiple times will use a label
# despite the label not necessarily being used in the
# output. The "use_remote_label" values should be
# calculated when rendering the asm output, based on
# which addresses and which op codes will be displayed
# (within the range).
asm_command["use_remote_label"] = "unknown"
else:
remote_label = "asm_" + hex(target_address)
# This remote address might not be part of this
# function.
asm_commands[target_address] = {
"references": 1,
"current_label": remote_label,
"address": target_address,
}
# Also, target_address can be negative (before the
# start_address that the user originally requested),
# and it shouldn't be shown on asm output because the
# intermediate bytes (between a negative target_address
# and start_address) won't be disassembled.
# Don't know yet if this remote address is part of this
# function or not. When the remote address is not part
# of this function, the label name should not be used,
# because that label will not be disassembled in the
# output, until the user asks it to.
asm_command["use_remote_label"] = "unknown"
asm_command["remote_label"] = remote_label
elif current_byte == 0x3e:
last_a_address = ord(rom[offset + 1])
# store the formatted string for the output later
asm_command["formatted"] = opstr
if current_byte == 0x21:
last_hl_address = byte1 + (byte2 << 8)
# this is leftover from pokered, might be meaningless
if current_byte == 0xcd:
if number == 0x3d97:
used_3d97 = True
if current_byte == 0xc3 or current_byte in relative_unconditional_jumps:
if current_byte == 0xc3:
if number == 0x3d97:
used_3d97 = True
# stop reading at a jump, relative jump or return
if current_byte in end_08_scripts_with:
is_data = False
if not self.has_outstanding_labels(asm_commands, offset):
keep_reading = False
break
else:
keep_reading = True
else:
keep_reading = True
else:
# This shouldn't really happen, and means that this area of the
# ROM probably doesn't represent instructions.
asm_command["type"] = "data" # db
asm_command["value"] = current_byte
keep_reading = False
# save this new command in the list
asm_commands[asm_command["address"]] = asm_command
# jump forward by a byte
offset += 1
# also save the last command if necessary
if len(asm_commands.keys()) > 0 and asm_commands[asm_commands.keys()[-1]] is not asm_command:
asm_commands[asm_command["address"]] = asm_command
# store the set of commands on this object
self.asm_commands = asm_commands
self.end_address = offset + 1
self.last_address = self.end_address
def has_outstanding_labels(self, asm_commands, offset):
""" Checks if there are any labels that haven't yet been created.
""" # is this really necessary??
return False
def used_addresses(self):
""" Returns a list of unique addresses that this function will probably
call.
"""
addresses = set()
for (id, command) in self.asm_commands.items():
if command.has_key("target_address") and command["id"] in call_commands:
addresses.add(command["target_address"])
return addresses
def __str__(self):
""" ASM pretty printer.
"""
output = ""
for (key, line) in self.asm_commands.items():
# skip anything from before the beginning
if key < self.start_address:
continue
# show a label
if line["references"] > 0 and "current_label" in line.keys():
if line["address"] == self.start_address:
output += "thing: ; " + hex(line["address"]) + "\n"
else:
output += "." + line["current_label"] + "\@ ; " + hex(line["address"]) + "\n"
# show the actual line
if line.has_key("formatted_with_labels"):
output += spacing + line["formatted_with_labels"]
elif line.has_key("formatted"):
output += spacing + line["formatted"]
#output += " ; to " +
output += "\n"
# show the next address after this chunk
output += "; " + hex(self.end_address)
return output
class AsmList(list):
""" Simple wrapper to prevent all asm lines from being shown on screen.
"""
def length(self):
""" len(self)
"""
return len(self)
def __repr__(self):
""" Simplifies this object so that the output doesn't overflow stdout.
"""
return "AsmList(too long)"
if __name__ == "__main__":
cryrom = RomStr(open("../pokecrystal.gbc", "r").read());
asm = cryrom.to_asm(sys.argv[1])
print asm