87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
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from pathlib import Path
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def u16(data, off):
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return data[off] | (data[off + 1] << 8)
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def u32(data, off):
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return u16(data, off) | (u16(data, off + 2) << 16)
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def selector_to_segment_index(selector):
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return ((selector - 0x1000) // 8) + 1
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def get_segment_info(data, selector):
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ne_off = u32(data, 0x3C)
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seg_table_off = ne_off + u16(data, ne_off + 0x22)
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align_shift = u16(data, ne_off + 0x32)
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seg_index = selector_to_segment_index(selector)
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seg_entry_off = seg_table_off + (seg_index - 1) * 8
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sector = u16(data, seg_entry_off)
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seg_len = u16(data, seg_entry_off + 2)
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if seg_len == 0:
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seg_len = 0x10000
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flags = u16(data, seg_entry_off + 4)
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seg_file_off = sector << align_shift
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reloc_off = seg_file_off + seg_len
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reloc_count = u16(data, reloc_off)
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return {
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'selector': selector,
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'segment_index': seg_index,
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'segment_file_off': seg_file_off,
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'segment_len': seg_len,
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'flags': flags,
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'reloc_off': reloc_off,
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'reloc_count': reloc_count,
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}
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def read_relocs(data, seg_info):
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relocs = []
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pos = seg_info['reloc_off'] + 2
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for i in range(seg_info['reloc_count']):
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relocs.append({
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'index': i,
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'record_off': pos,
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'src_type': data[pos],
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'flags': data[pos + 1],
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'src_off': u16(data, pos + 2),
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'b4': data[pos + 4],
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'b5': data[pos + 5],
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'target_off': u16(data, pos + 6),
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'raw': data[pos:pos + 8],
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})
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pos += 8
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return relocs
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def dump_site(data, seg_info, site, size=16):
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raw = seg_info['segment_file_off'] + site
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print(f'site {seg_info["selector"]:04X}:{site:04X} -> file 0x{raw:X}: {data[raw:raw+size].hex(" ")}')
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def main():
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path = Path(r'd:\Ghidra\Crusader\REGRET.EXE')
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data = path.read_bytes()
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for selector in (0x1148, 0x13F8):
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info = get_segment_info(data, selector)
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print(f'selector 0x{selector:04X} -> segment index {info["segment_index"]}, file 0x{info["segment_file_off"]:X}, len 0x{info["segment_len"]:X}, reloc@0x{info["reloc_off"]:X}, count={info["reloc_count"]}')
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relocs = read_relocs(data, info)
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interesting = []
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if selector == 0x1148:
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interesting = [0x3678, 0x36C0, 0x3702, 0x3743]
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else:
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interesting = [0x10FA, 0x2040, 0x209F, 0x20B9]
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for site in interesting:
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dump_site(data, info, site, 24)
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local_hits = [r for r in relocs if site <= r['src_off'] <= site + 0x80]
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for r in local_hits[:20]:
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print(f' reloc idx={r["index"]} rec@0x{r["record_off"]:X} src=0x{r["src_off"]:04X} bytes={r["raw"].hex(" ")}')
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print('')
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if __name__ == '__main__':
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main()
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