[Qemu-devel] [AMD64] Possible problem with the DF flag during the SYSCALL instruction

[Jakub Jermar]

Hi,

yesterday I tried to mask off the DF flag from the RFLAGS register 
during the SYSCALL instruction by specifying this bit in the SFMASK MSR 
register while running HelenOS.

With QEMU, this didn't work (but it worked in Simics, for instance), so 
I suspect that there is something wrong with handling RFLAGS.DF during 
SYSCALL. Anyone wants to have a look?

Regards,
Jakub