Messages in this thread | | | Date | Tue, 5 Oct 2021 22:56:12 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v4 04/15] cfi: Add DEFINE_CFI_IMMEDIATE_RETURN_STUB |
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On Tue, Oct 05, 2021 at 01:29:02PM -0700, Sami Tolvanen wrote: > On Mon, Oct 4, 2021 at 11:59 PM Peter Zijlstra <peterz@infradead.org> wrote:
> > For x86_64 it should indeed never get called, however if you plan on > > supporting i386 then you need the annotation. Also, it might get called > > on arm64 which is about to grow basic HAVE_STATIC_CALL support. > > Good point. I read through the latest arm64 static call proposal and > while it can fall back to an indirect call, it doesn't look like that > would cause issues with CFI.
Because that call is outside of compiler control? Same will be true for any HAVE_STATIC_CALL implementation I suppose. The trampoline will be outside of compiler control.
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