Thread (25 messages) 25 messages, 6 authors, 2011-12-16

[Android-virt] [Embeddedxen-devel] [Xen-devel] [ANNOUNCE] Xen port to Cortex-A15 / ARMv7 with virt extensions

From: arnd@arndb.de (Arnd Bergmann)
Date: 2011-12-01 15:42:52
Also in: kvm, lkml, virtualization, xen-devel

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
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help