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Re: [Xen-devel] [PATCH] Make strace happy with xeno64.

On 10 Jun 2005, at 09:06, Keir Fraser wrote:

Hi Keir, do you have time to take a look at this patch?

Li, Xin B wrote:
On x86_64, strace expects CS == 0x33 for 64bit
applications and CS == 0x23 for 32bit applications, or it
will complain.
This patch makes strace happy with xeno64.

The CS should be 0x23/0x33 -- no need for masking? Or is the fact that the upcall saved mask appears in bits 16-23 of the '4-byte' CS value a problem? We can move the saved mask if so: I think that would be neater.

I see that xenlinux places its own save mask at CS+4 anyway (not CS+2 as Xen does). So I've moved the Xen mask to CS+4 too. A very simple patch and you probably now will not need to patch the strace path.

 -- Keir

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