commit 10fb0ee6c54a0512a4b19447b6d40da9f2eab475
author Roland McGrath <mcgrathr@google.com> Thu Mar 06 14:49:33 2025 -0800
committer CQ Bot <fuchsia-internal-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Mar 06 14:49:33 2025 -0800
tree 8e1a55caf03fcfb1d7d9cd71e901624662bdae72
parent 93be445d9b2103239f32ef4c1188c6bb36db94fe

[kernel][arm64] Expose and enable FEAT_MOPS for EL0

This adds the ZX_ARM64_FEATURE_ISA_MOPS flag for the arm64
zx_system_get_features.  When the hardware supports FEAT_MOPS,
the kernel allows the instructions to be used in EL0.

This makes possible a new kind of machine exception, which is now
mapped to ZX_EXCP_UNDEFINED_INSTRUCTION rather than the catch-all
ZX_EXCP_GENERAL.  zxtest doesn't preserve exception details to be
checked by the test code, but the new userland test does include
a death test for inducing that exception (by flipping C between a
prologue insn and a main-body that has something left to do).

Change-Id: Ie6539364e89dd8fd9b03a4ec0758b1cb7abc6b4f
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1188013
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
API-Review: Roland McGrath <mcgrathr@google.com>
Reviewed-by: Travis Geiselbrecht <travisg@google.com>
Fuchsia-Auto-Submit: Roland McGrath <mcgrathr@google.com>