On Sun, 2016-07-24 at 22:42 +1000, Benjamin Herrenschmidt wrote: > > What *did* work was to copy what x86 does, which is to change my > helper_stvebx() to not use cpu_stb_data at all, but instead use > cpu_stb_data_ra(...., GETPC()), which mimmics what x86 does for some > of > it's helpers. > > That fixed the specific problem I was chasing. > > However, there are a ton of other helpers, in powerpc, s390 and other > archs, doing that cpu_stb_data() the same way we do, so I really > wonder > what's going on here. > > Some advice would be very much appreciated ;-)
FYI: This probably completely wrong patch (but it was easier than hacking all the helpers) fixed the problem for me. With this (and the video driver I wrote that I will publish asap), I can now reliably boot various versions of MacOS X in qemu ppc using a 7400 CPU. Cheers, Ben.
