[Lldb-commits] [PATCH] D98529: [lldb] Strip pointer authentication codes from aarch64 pc.

[Peter Collingbourne via Phabricator via lldb-commits]

pcc added a comment.

In D98529#2631946 <https://reviews.llvm.org/D98529#2631946>, @DavidSpickett wrote:

> TCR_ELx begins at 1 (see `D13.2.123 TCR_EL1, Translation Control Register (EL1)` in the armarm) and covers EL0 and 1. Looking at the pseudocode access to this is undefined at EL0.
>
> So the OS would have to provide you some other way to read that, I know this is missing on Linux at the moment. A user setting might be good for us supporting Linux too. (though I realise your immediate concern is MacOS)

On Linux you can query the NT_ARM_PAC_MASK regset and examine the insn_mask field of the result.

Note that this is a mask rather than the number of bits as this also allows reflecting whether TBI{,D}0 was set at execution time. I would suggest using a mask in any persisted storage format.


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