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From: Richard Henderson <rth@twiddle.net>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: "Rob Herring" <rob.herring@linaro.org>,
	"Peter Crosthwaite" <peter.crosthwaite@xilinx.com>,
	"Patch Tracking" <patches@linaro.org>,
	"Michael Matz" <matz@suse.de>,
	"Claudio Fontana" <claudio.fontana@huawei.com>,
	"Alexander Graf" <agraf@suse.de>,
	"QEMU Developers" <qemu-devel@nongnu.org>,
	"Will Newton" <will.newton@linaro.org>,
	"Dirk Mueller" <dmueller@suse.de>,
	"Laurent Desnogues" <laurent.desnogues@gmail.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
	"Christoffer Dall" <christoffer.dall@linaro.org>
Subject: Re: [Qemu-devel] [PATCH v4 12/21] target-arm: A64: Implement DC ZVA
Date: Fri, 07 Mar 2014 07:40:27 -0800	[thread overview]
Message-ID: <5319E86B.9070001@twiddle.net> (raw)
In-Reply-To: <CAFEAcA-PyFUeH7Le6UFygL_Z4V3b4ybKKhk4eeiBfaaatiAz8g@mail.gmail.com>

On 03/07/2014 07:11 AM, Peter Maydell wrote:
>> > As a bonus, you'll have accurate exceptions should the access throw, so you
>> > don't need to force the save of PC before calling the helper.  Which... I don't
>> > see you doing, so perhaps there's a bug here at the moment.
> Mmm. (In system mode we'll save PC as a side effect of having
> an accessfn defined for the DC_ZVA reginfo.)

Ah, I see it.

I'll note that the GETRA/PC thing can be made to work with any helper.  It's
just a matter of passing down the outermost helper's retaddr to
cpu_restore_state.  C.f. target-alpha's dynamic_excp/arith_excp functions.

So in theory there's no need for the accessfn to require storing the pc first.


r~

  parent reply	other threads:[~2014-03-07 15:40 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-06 19:32 [Qemu-devel] [PATCH v4 00/21] AArch64 system emulation (boots a kernel!) Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 01/21] target-arm: Split out private-to-target functions into internals.h Peter Maydell
2014-03-17  7:13   ` Peter Crosthwaite
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 02/21] target-arm: Implement AArch64 DAIF system register Peter Maydell
2014-03-17  2:30   ` Peter Crosthwaite
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 03/21] target-arm: Define exception record for AArch64 exceptions Peter Maydell
2014-03-17  2:53   ` Peter Crosthwaite
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 04/21] target-arm: Provide correct syndrome information for cpreg access traps Peter Maydell
2014-03-17  3:05   ` Peter Crosthwaite
2014-03-17 12:32     ` Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 05/21] target-arm: Add support for generating exceptions with syndrome information Peter Maydell
2014-03-17  3:19   ` Peter Crosthwaite
2014-03-17 12:40     ` Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 06/21] target-arm: Provide syndrome information for MMU faults Peter Maydell
2014-03-17  3:28   ` Peter Crosthwaite
2014-03-17 12:41     ` Peter Maydell
2014-03-17 12:50       ` Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 07/21] target-arm: A64: Correctly fault FP/Neon if CPACR.FPEN set Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 08/21] target-arm: A64: Add assertion that FP access was checked Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 09/21] target-arm: Fix VFP enables for AArch32 EL0 under AArch64 EL1 Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 10/21] target-arm: Add v8 mmu translation support Peter Maydell
2014-03-20 18:20   ` Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 11/21] target-arm: Don't mention PMU in debug feature register Peter Maydell
2014-03-17  5:13   ` Peter Crosthwaite
2014-03-17 12:58     ` Peter Maydell
2014-03-17 13:11       ` Peter Crosthwaite
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 12/21] target-arm: A64: Implement DC ZVA Peter Maydell
2014-03-07 14:51   ` Richard Henderson
2014-03-07 15:11     ` Peter Maydell
2014-03-07 15:25       ` Richard Henderson
2014-03-07 15:40       ` Richard Henderson [this message]
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 13/21] target-arm: Use dedicated CPU state fields for ARM946 access bit registers Peter Maydell
2014-03-17  5:20   ` Peter Crosthwaite
2014-03-17 13:03     ` Peter Maydell
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 14/21] target-arm: Implement AArch64 views of fault status and data registers Peter Maydell
2014-03-17  5:30   ` Peter Crosthwaite
2014-03-17 13:06     ` Peter Maydell
2014-03-17 13:17       ` Peter Crosthwaite
2014-03-06 19:32 ` [Qemu-devel] [PATCH v4 15/21] target-arm: Add AArch64 ELR_EL1 register Peter Maydell
2014-03-17  5:33   ` Peter Crosthwaite
2014-03-06 19:33 ` [Qemu-devel] [PATCH v4 16/21] target-arm: Implement SP_EL0, SP_EL1 Peter Maydell
2014-03-17  7:02   ` Peter Crosthwaite
2014-03-17  7:31     ` Peter Crosthwaite
2014-03-20 17:12     ` Peter Maydell
2014-03-06 19:33 ` [Qemu-devel] [PATCH v4 17/21] target-arm: Implement AArch64 SPSR_EL1 Peter Maydell
2014-03-06 19:33 ` [Qemu-devel] [PATCH v4 18/21] target-arm: Move arm_log_exception() into internals.h Peter Maydell
2014-03-17  7:04   ` Peter Crosthwaite
2014-03-06 19:33 ` [Qemu-devel] [PATCH v4 19/21] target-arm: Implement AArch64 EL1 exception handling Peter Maydell
2014-03-06 19:33 ` [Qemu-devel] [PATCH v4 20/21] target-arm: Add Cortex-A57 processor Peter Maydell
2014-03-20 19:18   ` Peter Maydell
2014-03-26  2:34   ` Rob Herring
2014-03-06 19:33 ` [Qemu-devel] [PATCH v4 21/21] hw/arm/virt: Add support for Cortex-A57 Peter Maydell
2014-03-17  7:12   ` Peter Crosthwaite
2014-04-10 15:02     ` Peter Maydell
2014-04-10 19:41       ` Rob Herring
2014-04-10 21:16         ` Peter Maydell
2014-03-07  4:09 ` [Qemu-devel] [PATCH v4 00/21] AArch64 system emulation (boots a kernel!) Xuebing Wang
2014-03-07  8:47   ` Peter Maydell

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