Excerpts from Segher Boessenkool's message of May 6, 2020 8:11 am: > Hi! > > On Thu, Apr 30, 2020 at 02:02:02PM +1000, Nicholas Piggin wrote: >> Add support for the scv instruction on POWER9 and later CPUs. > > Looks good to me in general :-)
Thanks for taking a look. >> For now this implements the zeroth scv vector 'scv 0', as identical >> to 'sc' system calls, with the exception that lr is not preserved, and >> it is 64-bit only. There may yet be changes made to this ABI, so it's >> for testing only. > > What does it do with SF=0? I don't see how it is obviously not a > security hole currently (but I didn't look too closely). Oh that's an outdated comment, I since decided better to keep all the code common and handle 32-bit compat the same way as existing sc syscall. Thanks, Nick
