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tst-arm-mte bug: PSTATE.TCO is cleared on exceptions
From: |
Szabolcs Nagy |
Subject: |
tst-arm-mte bug: PSTATE.TCO is cleared on exceptions |
Date: |
Mon, 20 Apr 2020 11:29:02 +0100 |
User-agent: |
Mutt/1.9.4 (2018-02-28) |
i'm using the branch at
https://github.com/rth7680/qemu/tree/tgt-arm-mte
to test armv8.5-a mte and hope this is ok to report bugs here.
i'm doing tests in qemu-system-aarch64 with linux userspace
code and it seems TCO bit gets cleared after syscalls or other
kernel entry, but PSTATE is expected to be restored, so i
suspect it is a qemu bug.
i think the architecture saves/restores PSTATE using SPSR_ELx
on exceptions.
i used the linux branch
https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=devel/mte-v2
attached a reproducer that segfaults in qemu but should work.
thanks.
bug.c
Description: Text Data
- tst-arm-mte bug: PSTATE.TCO is cleared on exceptions,
Szabolcs Nagy <=