Re: [Qemu-devel] [PATCH v3 0/4] target/arm: Implement ARMv8.5-BTI

[Peter Maydell]

On Mon, 4 Feb 2019 at 13:12, Richard Henderson
<address@hidden> wrote:
>
> One fixup to the set of patches applied to target-arm.next.
> One adjustment to what is now patch 3 wrt EXCP_SEMIHOST.
>
>
> r~
>
>
> Richard Henderson (4):
>   fixup! target/arm: Cache the GP bit for a page in MemTxAttrs
>   target/arm: Add x-guarded-pages cpu property for user-only
>   linux-user/aarch64: Reset btype for syscalls and signals
>   tests/tcg/aarch64: Add bti smoke test

I'm pretty sure we talked about this on IRC at some point,
but for the record: I believe the relevent ELF ABI spec docs
are now public that have the changes that describe how ELF
executables are marked up to indicate which parts should be
loaded into guarded pages. The rest of the userspace ABI
is likely to just be a new mmap() flag. So I think we're
better off implementing that (possibly still guarded by
an x- property if it's not finalized yet.)

thanks
-- PMM