From: Szabolcs Nagy <szabolcs.nagy@arm.com>
To: Dave Martin <Dave.Martin@arm.com>,
Florian Weimer <fweimer@redhat.com>, Yao Qi <qiyaoltc@gmail.com>
Cc: <nd@arm.com>, <linux-arm-kernel@lists.infradead.org>,
<libc-alpha@sourceware.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Marc Zyngier <Marc.Zyngier@arm.com>, <gdb@sourceware.org>,
Alan Hayward <alan.hayward@arm.com>,
Torvald Riegel <triegel@redhat.com>,
Christoffer Dall <christoffer.dall@linaro.org>
Subject: Re: [RFC PATCH 00/29] arm64: Scalable Vector Extension core support
Date: Wed, 30 Nov 2016 12:22:00 -0000 [thread overview]
Message-ID: <583EC488.9010906@arm.com> (raw)
In-Reply-To: <20161130120654.GJ1574@e103592.cambridge.arm.com>
On 30/11/16 12:06, Dave Martin wrote:
> For setcontext/setjmp, we don't save/restore any SVE state due to the
> caller-save status of SVE, and I would not consider it necessary to
> save/restore VL itself because of the no-change-on-the-fly policy for
> this.
the problem is not changing VL within a thread,
but that setcontext can resume a context of a
different thread which had different VL and there
might be SVE regs spilled on the stack according
to that.
(i consider this usage undefined, but at least
the gccgo runtime does this)
next prev parent reply other threads:[~2016-11-30 12:22 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-25 19:39 Dave Martin
2016-11-25 19:39 ` [RFC PATCH 02/29] arm64: signal: factor frame layout and population into separate passes Dave Martin
2016-11-25 19:39 ` [RFC PATCH 03/29] arm64: signal: factor out signal frame record allocation Dave Martin
2016-11-25 19:39 ` [RFC PATCH 01/29] arm64: signal: Refactor sigcontext parsing in rt_sigreturn Dave Martin
2016-11-25 19:40 ` [RFC PATCH 05/29] arm64: signal: Parse extra_context during sigreturn Dave Martin
2016-11-25 19:40 ` [RFC PATCH 04/29] arm64: signal: Allocate extra sigcontext space as needed Dave Martin
2016-11-25 19:41 ` [RFC PATCH 17/29] arm64/sve: signal: Dump Scalable Vector Extension registers to user stack Dave Martin
2016-11-25 19:41 ` [RFC PATCH 18/29] arm64/sve: signal: Restore FPSIMD/SVE state in rt_sigreturn Dave Martin
2016-11-25 19:41 ` [RFC PATCH 16/29] arm64/sve: signal: Add SVE state record to sigcontext Dave Martin
2016-11-25 19:41 ` [RFC PATCH 24/29] arm64/sve: Discard SVE state on system call Dave Martin
2016-11-30 9:56 ` [RFC PATCH 00/29] arm64: Scalable Vector Extension core support Yao Qi
2016-11-30 12:07 ` Dave Martin
2016-11-30 12:22 ` Szabolcs Nagy [this message]
2016-11-30 14:10 ` Dave Martin
2016-11-30 12:38 ` Florian Weimer
2016-11-30 13:56 ` Dave Martin
2016-12-01 9:21 ` Florian Weimer
2016-12-01 10:30 ` Dave Martin
2016-12-01 12:19 ` Dave Martin
2016-12-05 10:44 ` Florian Weimer
2016-12-05 11:07 ` Szabolcs Nagy
2016-12-05 15:05 ` Dave Martin
2016-12-02 11:49 ` Dave Martin
2016-12-02 16:34 ` Florian Weimer
2016-12-02 16:59 ` Joseph Myers
2016-12-02 18:21 ` Dave Martin
2016-12-02 21:57 ` Joseph Myers
2016-12-02 21:56 ` Yao Qi
2016-12-05 15:12 ` Dave Martin
2016-12-05 22:42 ` Torvald Riegel
2016-12-06 14:46 ` Dave Martin
2016-11-30 10:08 ` Florian Weimer
2016-11-30 11:06 ` Szabolcs Nagy
2016-11-30 14:06 ` Dave Martin
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