From: Arnd Bergmann <arnd@arndb.de>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: "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>,
Pawel Moll <Pawel.Moll@arm.com>,
Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"android-virt@lists.cs.columbia.edu"
<android-virt@lists.cs.columbia.edu>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"embeddedxen-devel@lists.sourceforge.net"
<embeddedxen-devel@lists.sourceforge.net>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [Android-virt] [Embeddedxen-devel] [Xen-devel] [ANNOUNCE] Xen port to Cortex-A15 / ARMv7 with virt extensions
Date: Thu, 1 Dec 2011 15:42:19 +0000 [thread overview]
Message-ID: <201112011542.19377.arnd@arndb.de> (raw)
In-Reply-To: <20111201151043.GG27394@arm.com>
On Thursday 01 December 2011, Catalin Marinas wrote:
> Given the way register banking is done on AArch64, issuing an HVC on a
> 32-bit guest OS doesn't require translation on a 64-bit hypervisor. We
> have a similar implementation at the SVC level (for 32-bit user apps on
> a 64-bit kernel), the only modification was where a 32-bit SVC takes a
> 64-bit parameter in two separate 32-bit registers, so packing needs to
> be done in a syscall wrapper.
How do you deal with signed integer arguments passed into SVC or HVC from
a caller? If I understand the architecture correctly, the upper
halves of the argument register end up zero-padded, while the callee
expects sign-extension.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [Android-virt] [Embeddedxen-devel] [Xen-devel] [ANNOUNCE] Xen port to Cortex-A15 / ARMv7 with virt extensions
Date: Thu, 1 Dec 2011 15:42:19 +0000 [thread overview]
Message-ID: <201112011542.19377.arnd@arndb.de> (raw)
In-Reply-To: <20111201151043.GG27394@arm.com>
On Thursday 01 December 2011, Catalin Marinas wrote:
> Given the way register banking is done on AArch64, issuing an HVC on a
> 32-bit guest OS doesn't require translation on a 64-bit hypervisor. We
> have a similar implementation at the SVC level (for 32-bit user apps on
> a 64-bit kernel), the only modification was where a 32-bit SVC takes a
> 64-bit parameter in two separate 32-bit registers, so packing needs to
> be done in a syscall wrapper.
How do you deal with signed integer arguments passed into SVC or HVC from
a caller? If I understand the architecture correctly, the upper
halves of the argument register end up zero-padded, while the callee
expects sign-extension.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>,
Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"linaro-dev@lists.linaro.org" <linaro-dev@lists.linaro.org>,
Pawel Moll <Pawel.Moll@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"android-virt@lists.cs.columbia.edu"
<android-virt@lists.cs.columbia.edu>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"embeddedxen-devel@lists.sourceforge.net"
<embeddedxen-devel@lists.sourceforge.net>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [Android-virt] [Embeddedxen-devel] [Xen-devel] [ANNOUNCE] Xen port to Cortex-A15 / ARMv7 with virt extensions
Date: Thu, 1 Dec 2011 15:42:19 +0000 [thread overview]
Message-ID: <201112011542.19377.arnd@arndb.de> (raw)
In-Reply-To: <20111201151043.GG27394@arm.com>
On Thursday 01 December 2011, Catalin Marinas wrote:
> Given the way register banking is done on AArch64, issuing an HVC on a
> 32-bit guest OS doesn't require translation on a 64-bit hypervisor. We
> have a similar implementation at the SVC level (for 32-bit user apps on
> a 64-bit kernel), the only modification was where a 32-bit SVC takes a
> 64-bit parameter in two separate 32-bit registers, so packing needs to
> be done in a syscall wrapper.
How do you deal with signed integer arguments passed into SVC or HVC from
a caller? If I understand the architecture correctly, the upper
halves of the argument register end up zero-padded, while the callee
expects sign-extension.
Arnd
next prev parent reply other threads:[~2011-12-01 15:42 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-29 14:53 [ANNOUNCE] Xen port to Cortex-A15 / ARMv7 with virt extensions Stefano Stabellini
2011-11-29 14:53 ` Stefano Stabellini
2011-11-29 14:53 ` Stefano Stabellini
2011-11-29 14:53 ` Stefano Stabellini
2011-11-29 21:29 ` Arnd Bergmann
2011-11-29 21:29 ` Arnd Bergmann
2011-11-29 21:29 ` Arnd Bergmann
[not found] ` <201111292129.20444.arnd-r2nGTMty4D4@public.gmane.org>
2011-11-30 4:42 ` Anup Patel
2011-11-30 11:41 ` Stefano Stabellini
2011-11-30 11:41 ` Stefano Stabellini
2011-11-30 11:41 ` Stefano Stabellini
2011-11-30 4:42 ` Anup Patel
2011-11-30 11:39 ` Stefano Stabellini
2011-11-30 11:39 ` Stefano Stabellini
2011-11-30 11:39 ` Stefano Stabellini
2011-11-30 13:03 ` Arnd Bergmann
2011-11-30 13:03 ` Arnd Bergmann
2011-11-30 13:25 ` [Xen-devel] " Ian Campbell
2011-11-30 13:25 ` Ian Campbell
2011-11-30 13:25 ` Ian Campbell
2011-11-30 14:32 ` Arnd Bergmann
2011-11-30 14:32 ` Arnd Bergmann
2011-11-30 14:32 ` Arnd Bergmann
2011-11-30 14:32 ` Arnd Bergmann
2011-11-30 14:51 ` Pawel Moll
2011-11-30 14:51 ` Pawel Moll
2011-11-30 14:51 ` Pawel Moll
2011-11-30 16:27 ` Ian Campbell
2011-11-30 16:27 ` Ian Campbell
2011-11-30 16:27 ` Ian Campbell
2011-11-30 18:15 ` Arnd Bergmann
2011-11-30 18:15 ` Arnd Bergmann
2011-11-30 18:15 ` Arnd Bergmann
2011-11-30 18:15 ` Arnd Bergmann
2011-11-30 18:32 ` [Embeddedxen-devel] " Stefano Stabellini
2011-11-30 18:32 ` Stefano Stabellini
2011-11-30 18:32 ` Stefano Stabellini
2011-12-01 10:26 ` Ian Campbell
2011-12-01 10:26 ` Ian Campbell
2011-12-01 10:26 ` Ian Campbell
2011-12-01 15:10 ` [Android-virt] " Catalin Marinas
2011-12-01 15:10 ` Catalin Marinas
2011-12-01 15:10 ` Catalin Marinas
2011-12-01 15:10 ` Catalin Marinas
2011-12-01 15:42 ` Arnd Bergmann [this message]
2011-12-01 15:42 ` Arnd Bergmann
2011-12-01 15:42 ` Arnd Bergmann
2011-12-01 16:02 ` Catalin Marinas
2011-12-01 16:02 ` Catalin Marinas
2011-12-01 16:02 ` Catalin Marinas
2011-12-01 16:44 ` Arnd Bergmann
2011-12-01 16:44 ` Arnd Bergmann
2011-12-01 16:44 ` Arnd Bergmann
2011-12-01 16:57 ` Catalin Marinas
2011-12-01 16:57 ` Catalin Marinas
2011-12-01 16:57 ` Catalin Marinas
2011-12-01 15:52 ` Ian Campbell
2011-12-01 15:52 ` Ian Campbell
2011-12-01 15:52 ` Ian Campbell
2011-12-01 15:12 ` Stefano Stabellini
2011-12-01 15:12 ` Stefano Stabellini
2011-12-01 15:12 ` Stefano Stabellini
2011-12-01 10:34 ` Ian Campbell
2011-12-01 10:34 ` Ian Campbell
2011-11-30 13:03 ` Arnd Bergmann
2011-11-30 14:11 ` Catalin Marinas
2011-11-30 14:11 ` Catalin Marinas
2011-11-30 14:20 ` Stefano Stabellini
2011-11-30 14:20 ` Stefano Stabellini
2011-11-30 14:20 ` Stefano Stabellini
2011-12-16 15:43 ` [Xen-devel] " David Vrabel
2011-12-16 15:43 ` David Vrabel
2011-12-16 16:54 ` Catalin Marinas
2011-12-16 16:54 ` Catalin Marinas
2011-12-16 17:38 ` David Vrabel
2011-12-16 17:38 ` David Vrabel
2011-12-16 17:47 ` Catalin Marinas
2011-12-16 17:47 ` Catalin Marinas
2011-11-30 14:11 ` Catalin Marinas
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