On 17 December 2014 at 16:29, Mark Burton <mark.bur...@greensocs.com> wrote: >> On 17 Dec 2014, at 17:27, Peter Maydell <peter.mayd...@linaro.org> wrote: >> I think a mutex is fine, personally -- I just don't want >> to see fifteen hand-hacked mutexes in the target-* code. >> > > Which would seem to favour the helper function approach? > Or am I missing something?
You need at least some support from QEMU core -- consider what happens with this patch if the ldrex takes a data abort, for instance. And if you need the "stop all other CPUs while I do this" semantics linux-user currently uses then that definitely needs core code support. (Maybe linux-user is being over-zealous there; I haven't thought about it.) -- PMM
