[PATCH 0/2] target/arm: Fix unaligned mte checks

[Richard Henderson]

I was incorrectly assuming that only the first byte of an MTE access
is checked against the tags.  But per the ARM, unaligned accesses are
pre-decomposed into single-byte accesses.  So by the time we reach the
actual MTE check in the ARM pseudocode, all accesses are aligned.

There's probably more that could be simplified here, but I did try to
keep the patch small-ish.


r~


Richare Henderson (2):
  target/arm: Check PAGE_WRITE_ORG for MTE writeability
  target/arm: Fix unaligned mte checks

 target/arm/helper-a64.h           |   3 +-
 target/arm/internals.h            |  13 +--
 target/arm/translate-a64.h        |   2 +-
 target/arm/mte_helper.c           | 171 ++++++++++++------------------
 target/arm/sve_helper.c           |  96 ++++++-----------
 target/arm/translate-a64.c        |  52 ++++-----
 target/arm/translate-sve.c        |   9 +-
 tests/tcg/aarch64/mte-5.c         |  44 ++++++++
 tests/tcg/aarch64/Makefile.target |   2 +-
 9 files changed, 179 insertions(+), 213 deletions(-)
 create mode 100644 tests/tcg/aarch64/mte-5.c

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2.25.1