IBT/BTI instructions and D compilers

[Ernesto Castellotti]

On Monday, 10 July 2023 at 14:17:36 UTC, Iain Buclaw wrote:
> 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.


There is also for AArch64, see -mbranch-protection.
GCC/GDC works fine with -mbranch-protection on AArch64 but I 
don't know if it's the default.