[Bug 1847467] Re: qemu-x86_64 segment prefixes error

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/267


** Changed in: qemu
       Status: Confirmed => Expired

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #267
   https://gitlab.com/qemu-project/qemu/-/issues/267

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https://bugs.launchpad.net/bugs/1847467

Title:
  qemu-x86_64 segment prefixes error

Status in QEMU:
  Expired

Bug description:
  qemu-x86_64 version 4.1.0 (qemu-x86_64 version 4.0.0 also have the
  issue)

  In 64-bit mode (x86_64) the DS, ES, SS or CS segment prefixes should
  be ignored; qemu-x86_64 does not ignore them.

  example: an x86_64 instructions preceded by FS DS (0x64 0x26) segment
  prefixes have the linear address of its memory reference flat-mapped
  (as if DS was in action) whereas it should be FS-mapped (offset by
  FS_base, because the DS, ES, SS or CS are just ignored).

  
  I attach a small C++ program that shows this discrepancy.

  $ ./sample
  I'm not in QEMU

  $ qemu-x86_64 ./sample
  I'm in QEMU

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