[Xen-devel] 4gb_segments & movzbl

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>]

Hi,

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?

Samuel

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