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[Xen-devel] Re: 4gb_segments & movzbl

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Subject: [Xen-devel] Re: 4gb_segments & movzbl
From: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
Date: Wed, 7 Mar 2007 01:34:42 +0100
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Samuel Thibault, le Wed 07 Mar 2007 01:25:28 +0100, a écrit :
> I'm using VMASS_4gb_segments for now, and tried the following program:
> __thread char a;
> int main(void) {
>       printf("%d\n",a);
> }
> And I'm getting a SIGILL at
>  8048450:       65 0f b6 05 ff ff ff    movzbl %gs:0xffffffff,%eax
> When turning `a' into an int, the program works.  I guess this is
> because movzbl is somehow not correctly supported by the 4gb segment
> emulation?

That said, my hypervisor may be a bit old (3.0.3-0, more recent versions
fail to boot on my laptop).


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