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[Qemu-arm] [PATCH v2 0/4] target-arm: Clean up trap/undef handling of SR
From: |
Peter Maydell |
Subject: |
[Qemu-arm] [PATCH v2 0/4] target-arm: Clean up trap/undef handling of SRS |
Date: |
Fri, 12 Feb 2016 15:31:51 +0000 |
The SRS instruction is a bit of an oddity because it isn't
used by Linux these days. Nonetheless it has a bunch of
UNPREDICTABLE, UNDEF and trapping behaviour that we weren't
correctly implementing:
- trap to EL3 if EL3 is AArch64 and we are at Secure EL1
- UNDEFINED in Hyp mode
- UNPREDICTABLE in User or System mode
- UNPREDICTABLE if the specified mode is:
-- not implemented
-- not a valid mode number
-- a mode that's at a higher exception level
-- Monitor, if we are Non-secure
This series implements the checks we were missing and makes
us UNDEF for all the UNPREDICTABLE cases.
Patch 1 does the easy checks that can be done at translate time;
patches 2 and 3 are code motion in preparation for patch 4, which
puts in a run-time check for the one awkward case we don't have
enough information to UNDEF at translate time.
Changes v1->v2: drop the user-mode-only assertions from the
get_/set_r13_banked() functions as suggested in review.
These have all now been reviewed so I'm just sending them out
to the list for completeness -- I'll put the patches in
target-arm.next in a moment.
thanks
-- PMM
Peter Maydell (4):
target-arm: Clean up trap/undef handling of SRS
target-arm: Move get/set_r13_banked() to op_helper.c
target-arm: Combine user-only and softmmu get/set_r13_banked()
target-arm: UNDEF in the UNPREDICTABLE SRS-from-System case
target-arm/helper.c | 33 -------------------------
target-arm/op_helper.c | 26 ++++++++++++++++++++
target-arm/translate.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++----
3 files changed, 88 insertions(+), 38 deletions(-)
--
1.9.1
- [Qemu-arm] [PATCH v2 0/4] target-arm: Clean up trap/undef handling of SRS,
Peter Maydell <=