On Tue, Oct 29, 2019 at 10:45 AM Sami Tolvanen [off-list ref] wrote:

On Fri, Oct 25, 2019 at 4:03 AM Mark Rutland [off-list ref] wrote:

quoted

We have a similar issue with pointer authentication, and we're solving
that with -fpatchable-function-entry, which allows us to hook the
callsite before it does anything with the return address. IIUC we could
use the same mechanism here (and avoid introducing a third).

Are there plans to implement -fpatchable-function-entry on the clang
side?

I'm not sure if there are plans at the moment, but if this feature is
needed for PAC, adding it to clang shouldn't be a problem. Nick, did
you have any thoughts on this?

I didn't see anything explicitly in LLVM's issue tracker.  I also
didn't see -fpatchable-function-entry currently in -next other than
under arch/parisc.  Are there patches I can look at?

Has ARM's kernel team expressed the need to ARM's LLVM team?
-- 
Thanks,
~Nick Desaulniers

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