Re: [Xen-devel] [PATCH v3 2/2] xen/arm : emulation of arm's PSCI v0.2 standard

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-07-09 at 14:24 +0100, Ian Campbell wrote:
> If it is allowed then I think you need to be truncating the 32-bit
> arguments to 32-bits when an aarch64 guest calls the 32-bit entry
> points.

Looking at the SMC calling convention (ARM DEN 0028A) I think this is
indeed the case, since it specifies the use of w0..w7 for arguments when
an aarch64 cpu calls an SMC32 interface. It does say upper bits are
zero, but I think you need to check?

Ian.


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