IBT/BTI instructions and D compilers

[Iain Buclaw]

On Monday, 10 July 2023 at 11:24:37 UTC, Brian Callahan wrote:
> Hi all (but probably mostly Walter) --
>
> OpenBSD has moved to an all-BTI world. Binaries produced by DMD 
> and LDC no longer work because of this. If other OSes make this 
> move, this problem will be further compounded. Is there any 
> thought about enabling IBT/BTI instructions in DMD and LDC?
>
> Thanks.

This is Intel CET, right?

It's on by default at configure-time.

https://github.com/gcc-mirror/gcc/commit/08c1d39d3a822dfe7d91524ec290e0f230504242

Speaking of which, the asm support code for Fibers does not 
support shadow stacks, so you'll need to fall back to 
ucontext_t's swapcontext unless someone figures out what the 
correct way to handle it is.