From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Dave Martin <dave.martin@linaro.org>
Cc: Richard Earnshaw <Richard.Earnshaw@arm.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"linaro-dev@lists.linaro.org" <linaro-dev@lists.linaro.org>,
Ian Campbell <Ian.Campbell@citrix.com>,
"arnd@arndb.de" <arnd@arndb.de>,
Catalin Marinas <Catalin.Marinas@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
David Vrabel <david.vrabel@citrix.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH-WIP 01/13] xen/arm: use r12 to pass the hypercall number to the hypervisor
Date: Fri, 9 Mar 2012 11:20:20 -0500 (EST) [thread overview]
Message-ID: <alpine.LFD.2.02.1203091112050.24151@xanadu.home> (raw)
In-Reply-To: <CA+wbFdfF5c+Bw6RrxCm3YThqCRDuDYzanq+HV8a6LyXaBqWrQA@mail.gmail.com>
On Fri, 9 Mar 2012, Dave Martin wrote:
> Register variables feel like a red herring though. We're only using
> those because we can't do the needful thing and actually desscribe
> these constraints in the asm constraints (which would seem to be the
> right place). We specifically don't care where those values are
> except at the boundaries of the asm block itself.
Absolutely.
> Is there a reason why ARM gcc doesn't provide the ability to specify
> such exact-register constraints, or is this more for historical
> reasons? It is possible?
I don't know how much things have changed since I last looked at the gcc
code, but implementing this seemed to be pretty trivial at the time.
The problem would be to determine a good letter scheme to map to actual
registers.
Nicolas
next prev parent reply other threads:[~2012-03-09 16:20 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-23 17:47 [PATCH-WIP 00/13] xen/arm: receive Xen events and initialize xenbus Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 01/13] xen/arm: use r12 to pass the hypercall number to the hypervisor Stefano Stabellini
2012-02-27 16:27 ` Ian Campbell
[not found] ` <1330360043.8557.302.camel-o4Be2W7LfRlXesXXhkcM7miJhflN2719@public.gmane.org>
2012-02-27 18:03 ` Dave Martin
2012-02-27 19:33 ` Ian Campbell
[not found] ` <1330371219.10008.34.camel-ztPmHsLffjjnO4AKDKe2m+kiAK3p4hvP@public.gmane.org>
2012-02-28 10:20 ` Dave Martin
2012-02-28 10:48 ` Ian Campbell
[not found] ` <1330426133.31269.70.camel-o4Be2W7LfRlXesXXhkcM7miJhflN2719@public.gmane.org>
2012-02-28 12:28 ` Stefano Stabellini
2012-02-29 9:34 ` Dave Martin
2012-02-29 9:56 ` Ian Campbell
2012-02-29 11:47 ` Dave Martin
[not found] ` <1330509362.4270.20.camel-o4Be2W7LfRlXesXXhkcM7miJhflN2719@public.gmane.org>
2012-02-29 12:58 ` Dave Martin
2012-02-29 14:44 ` Ian Campbell
[not found] ` <1330526664.4270.128.camel-o4Be2W7LfRlXesXXhkcM7miJhflN2719@public.gmane.org>
2012-03-01 9:35 ` Dave Martin
2012-03-01 10:12 ` Russell King - ARM Linux
2012-03-02 21:19 ` Nicolas Pitre
2012-02-29 14:52 ` Stefano Stabellini
2012-03-01 9:51 ` Dave Martin
2012-03-01 10:10 ` Russell King - ARM Linux
[not found] ` <20120301101029.GB7363-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-03-01 10:27 ` Dave Martin
2012-03-01 10:35 ` Russell King - ARM Linux
[not found] ` <20120301103520.GD7363-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-03-01 12:12 ` Stefano Stabellini
[not found] ` <20120229125826.GC2077-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2012-03-02 21:15 ` Nicolas Pitre
2012-03-08 9:58 ` Richard Earnshaw
2012-03-08 12:17 ` Dave Martin
2012-03-08 17:21 ` Nicolas Pitre
[not found] ` <alpine.LFD.2.02.1203081041340.24151-QuJgVwGFrdf/9pzu0YdTqQ@public.gmane.org>
2012-03-08 18:47 ` Richard Earnshaw
[not found] ` <4F58FEC0.8080706-5wv7dgnIgG8@public.gmane.org>
2012-03-09 15:58 ` Dave Martin
2012-03-09 16:20 ` Nicolas Pitre [this message]
[not found] ` <alpine.LFD.2.02.1203091112050.24151-QuJgVwGFrdf/9pzu0YdTqQ@public.gmane.org>
2012-03-09 17:38 ` Richard Earnshaw
2012-02-27 21:05 ` Peter Maydell
2012-02-28 10:12 ` Ian Campbell
[not found] ` <1330019314-20865-1-git-send-email-stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>
2012-02-27 17:53 ` Dave Martin
2012-02-27 19:48 ` Ian Campbell
[not found] ` <1330372125.10008.47.camel-ztPmHsLffjjnO4AKDKe2m+kiAK3p4hvP@public.gmane.org>
2012-02-28 9:46 ` Dave Martin
2012-02-28 10:07 ` Ian Campbell
[not found] ` <20120228094616.GA2063-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2012-02-28 12:21 ` Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 02/13] xen/arm: introduce privcmp, physdev_op and memory_op hypercalls Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 03/13] xen/arm: mmu.h and page.h related definitions Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 04/13] xen/arm: sync_bitops Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 05/13] xen/arm: empty implementation of grant_table arch specific functions Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 06/13] xen/arm: missing includes Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 07/13] xen/arm: receive xen events on arm Stefano Stabellini
2012-02-24 11:12 ` David Vrabel
[not found] ` <4F4770AD.6040703-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
2012-02-24 12:23 ` Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 08/13] xen/arm: fix arm xen guest handle definitions Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 09/13] xen/arm: shared_info and start_info Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 10/13] xen/arm: empty implementation of xen_remap_domain_mfn_range Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 11/13] xen/arm: Introduce xen_pfn_t for pfn and mfn types Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 12/13] xen/arm: compile and run xenbus Stefano Stabellini
2012-02-23 17:48 ` [PATCH-WIP 13/13] xen/arm: compile grant-table features events and xenbus, do not compile pci Stefano Stabellini
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