Avi Kivity <avi@xxxxxxxxxx> writes:
> - add a watchpoint to break when the value of gs:[0x30] changes
It seems that the problem can be reproduced by compiling the following
simple program using cygwin's gcc. The program crashes on w2k3-amd64
on kvm-83 on core2-duo, and it does not crash on the same w2k3-amd64
installation on kvm-83 on AMD Phenom.
#include <setjmp.h>
jmp_buf env;
main()
{
if(setjmp(env)) return;
longjmp(env, 1);
}
The problem seems to be in the instruction ``mov gs,ax'' (Intel
syntax) in the longjmp() code. If I let the virtual machine execute
the instruction, the program crashes. However, if I step over the
instruction using the vs2008 debugger, the program completes without
crashing. Thus, I think that this is the instruction that Avi is
looking for, but I don't know how to proceed from here.
Hope this helps.
Cheers,
Matteo Frigo
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