[DynInst_API:] [dyninst/dyninst] 20c1c8: x86: handle disambiguation between XOP prefix and ...

[Kirill Batuzov <noreply@xxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: 20c1c899be22332135b8b82ce0596db425f9a24e
      https://github.com/dyninst/dyninst/commit/20c1c899be22332135b8b82ce0596db425f9a24e
  Author: Kirill Batuzov <43408219+batuzovk@xxxxxxxxxxxxxxxxxxxxxxxx>
  Date:   2024-05-31 (Fri, 31 May 2024)

  Changed paths:
    M common/src/arch-x86.C

  Log Message:
  -----------
  x86: handle disambiguation between XOP prefix and POP instruction (#1754)

0x8f can be either the first byte of XOP prefix, or the opcode of POP instruction. The disambiguation is resolved by map_select field of XOP's second byte. If it is XOP prefix, than the field should be from [0x8, 0x1f] range. Otherwise it is ModRM byte, and 0x8f is an opcode. The only instruction with this opcode is POP, and it requires Reg filed of ModRM to be 0.



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