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Re: [Qemu-devel] [PATCH] User mode: Handle x86_64 vsyscall

From: Vince Weaver
Subject: Re: [Qemu-devel] [PATCH] User mode: Handle x86_64 vsyscall
Date: Mon, 8 Feb 2010 09:57:15 -0500 (EST)

On Sun, 7 Feb 2010, Richard Henderson wrote:
> I imagine that QEMU's VDSO would not have the complicated bits that the
> kernel's version does, where it arranges to read the clock without going into
> kernel space.  I imagine QEMU would simply stuff a normal syscall sequence in
> there, which would automatically be emulated in the normal way.

For what it's worth, this is how various other systems I'm aware of handle 
x86_64 VDSOs (both Valgrind and the m5 simulator do it this way).


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