79 lines
2.4 KiB
Python
Executable File
79 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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parser = argparse.ArgumentParser(description='''
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Search a 68k binary file for the "MOVE.L <selector>,d0; DC.W $FE22"
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motif. Use the upper word of the selector to determine how many
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32-bit arguments the call takes. This is useful because, while many
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selector names are known from reversing the BlueAbstractionLayerLib,
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that PowerPC binary does not reveal anything about their function
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signatures. Instead this falls to 68k code, in which the number of
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arguments is often passed to a trap via the selector in order to
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avoid catastrophic stack damage in the unknown-selector case.
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''')
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parser.add_argument('src', action='store', help='Source file')
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parser.add_argument('-o', nargs='?', action='store', help='Listing file to update')
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parser.add_argument('-f', action='store_true', help='Force override listing file')
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args = parser.parse_args()
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with open(args.src, 'rb') as f:
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binary = f.read()
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def matches(long, short):
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keepers = bytearray()
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for i in range(len(short)):
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if short[i] == 0:
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keepers.append(long[i])
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if short[i] not in (0, long[i]):
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return False
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return bytes(keepers)
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MOTIF = b'\x20\x3C\x00\x00\x00\x00\xFE\x22'
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for i in range(len(binary) - len(MOTIF)):
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match = matches(binary[i:i+len(MOTIF)], MOTIF)
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if match:
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long = int.from_bytes(match, byteorder='big')
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selector = long & 0xFFFF
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nargs = long >> 16
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print('selector %04x: %d' % (selector, nargs))
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if args.o:
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with open(args.o) as f:
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lines = [l.rstrip('\n').split(' ') for l in f]
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for line in lines:
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line[0] = int(line[0], 16) # interpret the hex at the start!
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for line in lines:
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if line[0] == selector:
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if line[1] == '?':
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print('...updated')
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line[1] = str(nargs)
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elif line[1] != str(nargs):
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print('...WARNING: the listing file says %s' % line[1])
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if args.f: line[1] = str(nargs)
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break
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else:
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lines.append([selector, str(nargs), '???'])
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lines.sort()
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for line in lines:
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line[0] = '%04X' % line[0]
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with open(args.o, 'w') as f:
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f.write(''.join(' '.join(l)+'\n' for l in lines))
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