[Xen-bugs] [Bug 1388] New: Any program built using Watcom C compiler crashes due to POP GS problem.

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1388

           Summary: Any program built using Watcom C compiler crashes due to
                    POP GS problem.
           Product: Xen
           Version: unspecified
          Platform: x86-64
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: david_edmonds@xxxxxxx


Version according to XenServer is 5.0.0, build 10918p. Guest OS is Windows
Server 2008 64-bit.

All Watcom built programs are crashing. Have traced the issue to pop gs causing
a crash in the Windows64 thunk layer. This is in the Watcom startup so affects
all programs. The pop gs is innocent here as it is just part of a push gs / pop
gs pair saving and restoring registers in a function. The problem can be
demonstrated using Visual Studio and the following program which works fine
normnally but not when hosted on Xen.

int main(int argc, char ** argv)
{
        _asm {
                push gs
                pop gs
        }
        return 0;
}


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