[Xen-bugs] [Bug 939] New: 4gb_segments & movzbl

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=939

           Summary: 4gb_segments & movzbl
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cdpackaging
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: samuel.thibault@xxxxxxxxxxxx


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.  It looks like this is because
movzbl is somehow not correctly supported by the 4gb segment emulation.


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