> From: Alex Bennée [mailto:alex.ben...@linaro.org] > Pavel Dovgalyuk <dovga...@ispras.ru> writes: > > One more question about your trace points. > > In case of using trace point on every instruction execution, we may need > > accessing vCPU registers (including the flags). Are they valid in such > > cases? > > They are probably valid but the tricky bit will be doing it in a way > that doesn't expose the internals of the TCG. Maybe we could exploit the > GDB interface for this or come up with a named referencex API. > > > I'm asking, because at least i386 translation optimizes writebacks. > > How so? I have to admit the i386 translation code is the most opaque to > me but I wouldn't have thought changing the semantics of the guests > load/store operations would be a sensible idea.
Writeback to the registers (say EFLAGS), not to the memory. Pavel Dovgalyuk
