Re: kern/60539 (XSAVE changes break ucontext userspace API)

["Robert Elz via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR kern/60539; it has been noted by GNATS.

From: Robert Elz <kre%munnari.OZ.AU@localhost>
To: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, lib-bug-people%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/60539 (XSAVE changes break ucontext userspace API)
Date: Thu, 06 Aug 2026 18:10:09 +0700

     Date:        Thu, 6 Aug 2026 02:47:23 +0000
     From:        Taylor R Campbell <riastradh%NetBSD.org@localhost>
     Message-ID:  <20260806024725.4385484D7C%mail.netbsd.org@localhost>
 
 You can laugh as much as you like, and no need to reply, I know how
 absurd this would be ...
 
   | I think such applications are likely to be inherently problematic.  If
   | you're doing value substitution in an FPU trap handler, and some
   | AVX512 instruction operating on a 512-bit ZMM vector register traps,
 
 And if you were doing software emulation of the AVX512 instructions,
 wouldn't the trap handler need to be able to access the (emulated)
 registers ?
 
 kre