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[Bug 1867072] [NEW] ARM: tag bits cleared in FAR_EL1


From: Peter Collingbourne
Subject: [Bug 1867072] [NEW] ARM: tag bits cleared in FAR_EL1
Date: Thu, 12 Mar 2020 00:56:50 -0000

Public bug reported:

The ARM Architecture Reference Manual provides the following for
FAR_EL1:

"For a Data Abort or Watchpoint exception, if address tagging is enabled
for the address accessed by the data access that caused the exception,
then this field includes the tag."

However, I have found that the tag bits in FAR_EL1 are always clear,
even if the tag bits were set in the original access.

I can reproduce the problem on both 4.1.1 and master
(6e8a73e911f066527e775e04b98f31ebd19db600).

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1867072

Title:
  ARM: tag bits cleared in FAR_EL1

Status in QEMU:
  New

Bug description:
  The ARM Architecture Reference Manual provides the following for
  FAR_EL1:

  "For a Data Abort or Watchpoint exception, if address tagging is
  enabled for the address accessed by the data access that caused the
  exception, then this field includes the tag."

  However, I have found that the tag bits in FAR_EL1 are always clear,
  even if the tag bits were set in the original access.

  I can reproduce the problem on both 4.1.1 and master
  (6e8a73e911f066527e775e04b98f31ebd19db600).

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