mirror of
https://github.com/isledecomp/isle.git
synced 2024-11-22 23:57:54 -05:00
f247e10b7e
* Rather than using <OFFSET> as a replacement for all offsets in a function, label the offsets as <OFFSET1>, <OFFSET2>, etc. Doing this will avoid false-positive 100% matches resulting from the same function being called in two times where a different on should have been called or vice versa. And the same for globals. I already encountered one case of this in the wild. * When a 100% match initially fails, try to make the functions match by swapping register allocations. This makes it possible to get a 100% match where the generated machine code differs only in register allocation. * Only apply the above when it is possible to reach a 100% match in that way. Otherwise show the developer the unadultrated diff to avoid complicating decompilation. * In the result listing, show the functions which are "effective matches" in this way as "100%*" instead of "100%".
598 lines
20 KiB
Python
Executable file
598 lines
20 KiB
Python
Executable file
#!/usr/bin/env python3
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import argparse
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import base64
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from capstone import *
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import difflib
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import struct
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import subprocess
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import logging
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import os
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import sys
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import colorama
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import re
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parser = argparse.ArgumentParser(allow_abbrev=False,
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description='Recompilation Compare: compare an original EXE with a recompiled EXE + PDB.')
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parser.add_argument('original', metavar='original-binary', help='The original binary')
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parser.add_argument('recompiled', metavar='recompiled-binary', help='The recompiled binary')
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parser.add_argument('pdb', metavar='recompiled-pdb', help='The PDB of the recompiled binary')
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parser.add_argument('decomp_dir', metavar='decomp-dir', help='The decompiled source tree')
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parser.add_argument('--total', '-T', metavar='<count>', help='Total number of expected functions (improves total accuracy statistic)')
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parser.add_argument('--verbose', '-v', metavar='<offset>', help='Print assembly diff for specific function (original file\'s offset)')
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parser.add_argument('--html', '-H', metavar='<file>', help='Generate searchable HTML summary of status and diffs')
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parser.add_argument('--no-color', '-n', action='store_true', help='Do not color the output')
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parser.add_argument('--svg', '-S', metavar='<file>', help='Generate SVG graphic of progress')
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parser.add_argument('--svg-icon', metavar='icon', help='Icon to use in SVG (PNG)')
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parser.add_argument('--print-rec-addr', action='store_true', help='Print addresses of recompiled functions too')
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parser.set_defaults(loglevel=logging.INFO)
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parser.add_argument('--debug', action='store_const', const=logging.DEBUG, dest='loglevel', help='Print script debug information')
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args = parser.parse_args()
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logging.basicConfig(level=args.loglevel, format='[%(levelname)s] %(message)s')
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logger = logging.getLogger(__name__)
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colorama.init()
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verbose = None
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found_verbose_target = False
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if args.verbose:
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try:
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verbose = int(args.verbose, 16)
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except ValueError:
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parser.error('invalid verbose argument')
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html = args.html
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plain = args.no_color
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original = args.original
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if not os.path.isfile(original):
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parser.error('Original binary does not exist')
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recomp = args.recompiled
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if not os.path.isfile(recomp):
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parser.error('Recompiled binary does not exist')
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syms = args.pdb
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if not os.path.isfile(syms):
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parser.error('Symbols PDB does not exist')
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source = args.decomp_dir
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if not os.path.isdir(source):
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parser.error('Source directory does not exist')
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svg = args.svg
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# Declare a class that can automatically convert virtual executable addresses
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# to file addresses
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class Bin:
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def __init__(self, filename):
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logger.debug('Parsing headers of "%s"... ', filename)
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self.file = open(filename, 'rb')
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#HACK: Strictly, we should be parsing the header, but we know where
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# everything is in these two files so we just jump straight there
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# Read ImageBase
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self.file.seek(0xB4)
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self.imagebase, = struct.unpack('<i', self.file.read(4))
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# Read .text VirtualAddress
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self.file.seek(0x184)
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self.textvirt, = struct.unpack('<i', self.file.read(4))
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# Read .text PointerToRawData
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self.file.seek(0x18C)
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self.textraw, = struct.unpack('<i', self.file.read(4))
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logger.debug('... Parsing finished')
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def __del__(self):
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if self.file:
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self.file.close()
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def get_addr(self, virt):
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return virt - self.imagebase - self.textvirt + self.textraw
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def read(self, offset, size):
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self.file.seek(self.get_addr(offset))
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return self.file.read(size)
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class RecompiledInfo:
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def __init__(self):
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self.addr = None
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self.size = None
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self.name = None
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self.start = None
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class WinePathConverter:
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def __init__(self, unix_cwd):
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self.unix_cwd = unix_cwd
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self.win_cwd = self._call_winepath_unix2win(self.unix_cwd)
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def get_wine_path(self, unix_fn: str) -> str:
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if unix_fn.startswith('./'):
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return self.win_cmd + '\\' + unix_fn[2:].replace('/', '\\')
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if unix_fn.startswith(self.unix_cwd):
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return self.win_cwd + '\\' + unix_fn.removeprefix(self.unix_cwd).replace('/', '\\').lstrip('\\')
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return self._call_winepath_unix2win(unix_fn)
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def get_unix_path(self, win_fn: str) -> str:
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if win_fn.startswith('.\\') or win_fn.startswith('./'):
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return self.unix_cwd + '/' + win_fn[2:].replace('\\', '/')
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if win_fn.startswith(self.win_cwd):
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return self.unix_cwd + '/' + win_fn.removeprefix(self.win_cwd).replace('\\', '/')
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return self._call_winepath_win2unix(win_fn)
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@staticmethod
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def _call_winepath_unix2win(fn: str) -> str:
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return subprocess.check_output(['winepath', '-w', fn], text=True).strip()
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@staticmethod
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def _call_winepath_win2unix(fn: str) -> str:
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return subprocess.check_output(['winepath', fn], text=True).strip()
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def get_file_in_script_dir(fn):
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return os.path.join(os.path.dirname(os.path.abspath(sys.argv[0])), fn)
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# Declare a class that parses the output of cvdump for fast access later
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class SymInfo:
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funcs = {}
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lines = {}
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def __init__(self, pdb, file, wine_path_converter):
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call = [get_file_in_script_dir('cvdump.exe'), '-l', '-s']
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if wine_path_converter:
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# Run cvdump through wine and convert path to Windows-friendly wine path
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call.insert(0, 'wine')
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call.append(wine_path_converter.get_wine_path(pdb))
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else:
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call.append(pdb)
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logger.info('Parsing %s ...', pdb)
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logger.debug('Command = %r', call)
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line_dump = subprocess.check_output(call).decode('utf-8').split('\r\n')
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current_section = None
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logger.debug('Parsing output of cvdump.exe ...')
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for i, line in enumerate(line_dump):
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if line.startswith('***'):
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current_section = line[4:]
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if current_section == 'SYMBOLS' and 'S_GPROC32' in line:
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addr = int(line[26:34], 16)
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info = RecompiledInfo()
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info.addr = addr + recompfile.imagebase + recompfile.textvirt
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use_dbg_offs = False
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if use_dbg_offs:
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debug_offs = line_dump[i + 2]
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debug_start = int(debug_offs[22:30], 16)
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debug_end = int(debug_offs[43:], 16)
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info.start = debug_start
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info.size = debug_end - debug_start
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else:
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info.start = 0
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info.size = int(line[41:49], 16)
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info.name = line[77:]
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self.funcs[addr] = info
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elif current_section == 'LINES' and line.startswith(' ') and not line.startswith(' '):
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sourcepath = line.split()[0]
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if wine_path_converter:
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# Convert filename to Unix path for file compare
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sourcepath = wine_path_converter.get_unix_path(sourcepath)
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if sourcepath not in self.lines:
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self.lines[sourcepath] = {}
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j = i + 2
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while True:
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ll = line_dump[j].split()
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if len(ll) == 0:
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break
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k = 0
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while k < len(ll):
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linenum = int(ll[k + 0])
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address = int(ll[k + 1], 16)
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if linenum not in self.lines[sourcepath]:
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self.lines[sourcepath][linenum] = address
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k += 2
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j += 1
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logger.debug('... Parsing output of cvdump.exe finished')
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def get_recompiled_address(self, filename, line):
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addr = None
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found = False
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logger.debug('Looking for %s:%d', filename, line)
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for fn in self.lines:
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# Sometimes a PDB is compiled with a relative path while we always have
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# an absolute path. Therefore we must
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try:
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if os.path.samefile(fn, filename):
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filename = fn
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break
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except FileNotFoundError as e:
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continue
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if filename in self.lines and line in self.lines[fn]:
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addr = self.lines[fn][line]
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if addr in self.funcs:
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return self.funcs[addr]
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else:
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logger.error('Failed to find function symbol with address: 0x%x', addr)
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else:
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logger.error('Failed to find function symbol with filename and line: %s:%d', filename, line)
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wine_path_converter = None
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if os.name != 'nt':
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wine_path_converter = WinePathConverter(source)
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origfile = Bin(original)
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recompfile = Bin(recomp)
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syminfo = SymInfo(syms, recompfile, wine_path_converter)
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print()
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md = Cs(CS_ARCH_X86, CS_MODE_32)
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class OffsetPlaceholderGenerator:
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def __init__(self):
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self.counter = 0
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self.replacements = {}
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def get(self, addr):
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if addr in self.replacements:
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return self.replacements[addr]
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else:
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self.counter += 1
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replacement = '<OFFSET%d>' % self.counter
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self.replacements[addr] = replacement
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return replacement
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def sanitize(file, placeholderGenerator, mnemonic, op_str):
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op_str_is_number = False
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try:
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int(op_str, 16)
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op_str_is_number = True
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except ValueError:
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pass
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if (mnemonic == 'call' or mnemonic == 'jmp') and op_str_is_number:
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# Filter out "calls" because the offsets we're not currently trying to
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# match offsets. As long as there's a call in the right place, it's
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# probably accurate.
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op_str = placeholderGenerator.get(int(op_str, 16))
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else:
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def filter_out_ptr(ptype, op_str):
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try:
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ptrstr = ptype + ' ptr ['
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start = op_str.index(ptrstr) + len(ptrstr)
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end = op_str.index(']', start)
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# This will throw ValueError if not hex
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inttest = int(op_str[start:end], 16)
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return op_str[0:start] + placeholderGenerator.get(inttest) + op_str[end:]
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except ValueError:
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return op_str
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# Filter out dword ptrs where the pointer is to an offset
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op_str = filter_out_ptr('dword', op_str)
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op_str = filter_out_ptr('word', op_str)
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op_str = filter_out_ptr('byte', op_str)
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# Use heuristics to filter out any args that look like offsets
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words = op_str.split(' ')
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for i, word in enumerate(words):
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try:
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inttest = int(word, 16)
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if inttest >= file.imagebase + file.textvirt:
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words[i] = placeholderGenerator.get(inttest)
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except ValueError:
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pass
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op_str = ' '.join(words)
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return mnemonic, op_str
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def parse_asm(file, addr, size):
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asm = []
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data = file.read(addr, size)
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placeholderGenerator = OffsetPlaceholderGenerator()
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for i in md.disasm(data, 0):
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# Use heuristics to disregard some differences that aren't representative
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# of the accuracy of a function (e.g. global offsets)
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mnemonic, op_str = sanitize(file, placeholderGenerator, i.mnemonic, i.op_str)
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if op_str is None:
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asm.append(mnemonic)
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else:
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asm.append("%s %s" % (mnemonic, op_str))
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return asm
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REGISTER_LIST = set([
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'eax', 'ebx', 'ecx', 'edx', 'edi', 'esi', 'ebp', 'esp',
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'ax', 'bx', 'cx', 'dx', 'di', 'si', 'bp', 'sp',
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])
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WORDS = re.compile(r'\w+')
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def get_registers(line: str):
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to_replace = []
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# use words regex to find all matching positions:
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for match in WORDS.finditer(line):
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reg = match.group(0)
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if reg in REGISTER_LIST:
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to_replace.append((reg, match.start()))
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return to_replace
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def replace_register(lines: list[str], start_line: int, reg: str, replacement: str):
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for i in range(start_line, len(lines)):
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lines[i] = lines[i].replace(reg, replacement)
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# Is it possible to make new_asm the same as original_asm by swapping registers?
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def can_resolve_register_differences(original_asm, new_asm):
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# Swapping ain't gonna help if the lengths are different
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if len(original_asm) != len(new_asm):
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return False
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# Make copies so we don't modify the original
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original_asm = original_asm.copy()
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new_asm = new_asm.copy()
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# Look for the mismatching lines
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for i in range(len(original_asm)):
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new_line = new_asm[i]
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original_line = original_asm[i]
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if new_line != original_line:
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# Find all the registers to replace
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to_replace = get_registers(original_line)
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for j in range(len(to_replace)):
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(reg, reg_index) = to_replace[j]
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replacing_reg = new_line[reg_index:reg_index + len(reg)]
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if replacing_reg in REGISTER_LIST:
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if replacing_reg != reg:
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# Do a three-way swap replacing in all the subsequent lines
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temp_reg = "&" * len(reg)
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replace_register(new_asm, i, replacing_reg, temp_reg)
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replace_register(new_asm, i, reg, replacing_reg)
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replace_register(new_asm, i, temp_reg, reg)
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else:
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# No replacement to do, different code, bail out
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return False
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# Check if the lines are now the same
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for i in range(len(original_asm)):
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if new_asm[i] != original_asm[i]:
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return False
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return True
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function_count = 0
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total_accuracy = 0
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total_effective_accuracy = 0
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htmlinsert = []
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# Generate basename of original file, used in locating OFFSET lines
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basename = os.path.basename(os.path.splitext(original)[0])
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pattern = '// OFFSET:'
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for subdir, dirs, files in os.walk(source):
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for file in files:
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srcfilename = os.path.join(os.path.abspath(subdir), file)
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srcfile = open(srcfilename, 'r')
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line_no = 0
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while True:
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try:
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line = srcfile.readline()
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line_no += 1
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if not line:
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break
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line = line.strip()
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if line.startswith(pattern) and not line.endswith("STUB"):
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par = line[len(pattern):].strip().split()
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module = par[0]
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if module != basename:
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continue
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addr = int(par[1], 16)
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# Verbose flag handling
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if verbose:
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if addr == verbose:
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found_verbose_target = True
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else:
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continue
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find_open_bracket = line
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while '{' not in find_open_bracket:
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find_open_bracket = srcfile.readline()
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line_no += 1
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recinfo = syminfo.get_recompiled_address(srcfilename, line_no)
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if not recinfo:
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continue
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# The effective_ratio is the ratio when ignoring differing register
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# allocation vs the ratio is the true ratio.
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ratio = 0.0
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effective_ratio = 0.0
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if recinfo.size:
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origasm = parse_asm(origfile, addr + recinfo.start, recinfo.size)
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recompasm = parse_asm(recompfile, recinfo.addr + recinfo.start, recinfo.size)
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diff = difflib.SequenceMatcher(None, origasm, recompasm)
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ratio = diff.ratio()
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effective_ratio = ratio
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if ratio != 1.0:
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# Check whether we can resolve register swaps which are actually
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# perfect matches modulo compiler entropy.
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if can_resolve_register_differences(origasm, recompasm):
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effective_ratio = 1.0
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else:
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ratio = 0
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percenttext = "%.2f%%" % (effective_ratio * 100)
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if not plain:
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if effective_ratio == 1.0:
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percenttext = colorama.Fore.GREEN + percenttext + colorama.Style.RESET_ALL
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elif effective_ratio > 0.8:
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percenttext = colorama.Fore.YELLOW + percenttext + colorama.Style.RESET_ALL
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else:
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percenttext = colorama.Fore.RED + percenttext + colorama.Style.RESET_ALL
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if effective_ratio == 1.0 and ratio != 1.0:
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if plain:
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percenttext += "*"
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else:
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percenttext += colorama.Fore.RED + "*" + colorama.Style.RESET_ALL
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if not verbose:
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if args.print_rec_addr:
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addrs = '%s / %s' % (hex(addr), hex(recinfo.addr))
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else:
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addrs = hex(addr)
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print(' %s (%s) is %s similar to the original' % (recinfo.name, addrs, percenttext))
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function_count += 1
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total_accuracy += ratio
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total_effective_accuracy += effective_ratio
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if recinfo.size:
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udiff = difflib.unified_diff(origasm, recompasm, n=10)
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# If verbose, print the diff for that funciton to the output
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if verbose:
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if effective_ratio == 1.0:
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ok_text = "OK!" if plain else (colorama.Fore.GREEN + "✨ OK! ✨" + colorama.Style.RESET_ALL)
|
|
if ratio == 1.0:
|
|
print("%s: %s 100%% match.\n\n%s\n\n" %
|
|
(hex(addr), recinfo.name, ok_text))
|
|
else:
|
|
print("%s: %s Effective 100%% match. (Differs in register allocation only)\n\n%s (still differs in register allocation)\n\n" %
|
|
(hex(addr), recinfo.name, ok_text))
|
|
else:
|
|
for line in udiff:
|
|
if line.startswith("++") or line.startswith("@@") or line.startswith("--"):
|
|
# Skip unneeded parts of the diff for the brief view
|
|
pass
|
|
elif line.startswith("+"):
|
|
if plain:
|
|
print(line)
|
|
else:
|
|
print(colorama.Fore.GREEN + line)
|
|
elif line.startswith("-"):
|
|
if plain:
|
|
print(line)
|
|
else:
|
|
print(colorama.Fore.RED + line)
|
|
else:
|
|
print(line)
|
|
if not plain:
|
|
print(colorama.Style.RESET_ALL, end='')
|
|
|
|
print("\n%s is only %s similar to the original, diff above" % (recinfo.name, percenttext))
|
|
|
|
# If html, record the diffs to an HTML file
|
|
if html:
|
|
escaped = '\\n'.join(udiff).replace('"', '\\"').replace('\n', '\\n').replace('<', '<').replace('>', '>')
|
|
htmlinsert.append('{address: "%s", name: "%s", matching: %s, diff: "%s"}' % (hex(addr), recinfo.name, str(effective_ratio), escaped))
|
|
|
|
except UnicodeDecodeError:
|
|
break
|
|
|
|
def gen_html(html, data):
|
|
templatefile = open(get_file_in_script_dir('template.html'), 'r')
|
|
if not templatefile:
|
|
print('Failed to find HTML template file, can\'t generate HTML summary')
|
|
return
|
|
|
|
templatedata = templatefile.read()
|
|
templatefile.close()
|
|
|
|
templatedata = templatedata.replace('/* INSERT DATA HERE */', ','.join(data), 1)
|
|
|
|
htmlfile = open(html, 'w')
|
|
if not htmlfile:
|
|
print('Failed to write to HTML file %s' % html)
|
|
return
|
|
|
|
htmlfile.write(templatedata)
|
|
htmlfile.close()
|
|
|
|
def gen_svg(svg, name, icon, implemented_funcs, total_funcs, raw_accuracy):
|
|
templatefile = open(get_file_in_script_dir('template.svg'), 'r')
|
|
if not templatefile:
|
|
print('Failed to find SVG template file, can\'t generate SVG summary')
|
|
return
|
|
|
|
templatedata = templatefile.read()
|
|
templatefile.close()
|
|
|
|
# Replace icon
|
|
if args.svg_icon:
|
|
iconfile = open(args.svg_icon, 'rb')
|
|
templatedata = templatedata.replace('{icon}', base64.b64encode(iconfile.read()).decode('utf-8'), 1)
|
|
iconfile.close()
|
|
|
|
# Replace name
|
|
templatedata = templatedata.replace('{name}', name, 1)
|
|
|
|
# Replace implemented statistic
|
|
templatedata = templatedata.replace('{implemented}', '%.2f%% (%i/%i)' % (implemented_funcs / total_funcs * 100, implemented_funcs, total_funcs), 1)
|
|
|
|
# Replace accuracy statistic
|
|
templatedata = templatedata.replace('{accuracy}', '%.2f%%' % (raw_accuracy / implemented_funcs * 100), 1)
|
|
|
|
# Generate progress bar width
|
|
total_statistic = raw_accuracy / total_funcs
|
|
percenttemplate = '{progbar'
|
|
percentstart = templatedata.index(percenttemplate)
|
|
percentend = templatedata.index('}', percentstart)
|
|
progwidth = float(templatedata[percentstart + len(percenttemplate) + 1:percentend]) * total_statistic
|
|
templatedata = templatedata[0:percentstart] + str(progwidth) + templatedata[percentend + 1:]
|
|
|
|
# Replace percentage statistic
|
|
templatedata = templatedata.replace('{percent}', '%.2f%%' % (total_statistic * 100), 2)
|
|
|
|
svgfile = open(svg, 'w')
|
|
if not svgfile:
|
|
print('Failed to write to SVG file %s' % svg)
|
|
return
|
|
|
|
svgfile.write(templatedata)
|
|
svgfile.close()
|
|
|
|
if html:
|
|
gen_html(html, htmlinsert)
|
|
|
|
if verbose:
|
|
if not found_verbose_target:
|
|
print('Failed to find the function with address %s' % hex(verbose))
|
|
else:
|
|
implemented_funcs = function_count
|
|
|
|
if args.total:
|
|
function_count = int(args.total)
|
|
|
|
if function_count > 0:
|
|
print('\nTotal effective accuracy %.2f%% across %i functions (%.2f%% actual accuracy)' %
|
|
(total_effective_accuracy / function_count * 100, function_count, total_accuracy / function_count * 100))
|
|
|
|
if svg:
|
|
gen_svg(svg, os.path.basename(original), args.svg_icon, implemented_funcs, function_count, total_effective_accuracy)
|