On 23 November 2011 23:00, Alexander Graf <ag...@suse.de> wrote: > > On 23.11.2011, at 23:34, Peter Maydell wrote: > >> On 23 November 2011 22:03, Alexander Graf <ag...@suse.de> wrote: >>> Yes. Maybe we should add a check if input_state != output_state and >>> only then do the conversion? >> >> I'm not sure this works (unless you go to the effort of implementing >> target_to_host_waitstatus() which seems overkill to me) but I'm not >> entirely sure what you're proposing to compare to what. > > It's an integer. If the number is the same before and after the wait > syscall, we can safely assume that it's the same thing, so we don't > have to convert it, no?
But you don't know whether it's the same before and after because wait() didn't write to it [=> don't write to guest memory] or if wait() did write to it but happened to write it as the same value it had before [=> do write to guest memory]. -- PMM
