1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
# -*- coding: utf-8 -*-
from __future__ import print_function
from __future__ import absolute_import
import sys
import os
import time
import datetime
from ctypes import c_int8
from copy import copy
import json
# New versions of json don't have read anymore.
if not hasattr(json, "read"):
json.read = json.loads
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, filename=None, crystal=True, red=False):
"""
Load a ROM into a RomStr.
"""
if crystal and not red and not filename:
file_handler = open("../baserom.gbc", "r")
elif red and not crystal and not filename:
file_handler = open("../pokered-baserom.gbc", "r")
elif filename not in ["", None]:
file_handler = open(filename, "rb")
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.read(open(filename, "r").read())
def get_address_for(self, label):
"""
Return 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):
"""
Return 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):
"""
Return 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):
"""
Disassemble 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) in [str, unicode] 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
raise NotImplementedError("DisAsm was removed and never worked; hook up another disassembler please.")
#return DisAsm(start_address=start_address, end_address=end_address, size=size, max_size=max_size, debug=debug, rom=self)
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)
|
