On Thu, Nov 29, 2018 at 09:41:33AM -0800, Andy Lutomirski wrote: > > > On Nov 29, 2018, at 9:21 AM, Steven Rostedt <rost...@goodmis.org> wrote: > > > > On Thu, 29 Nov 2018 12:20:00 -0500 > > Steven Rostedt <rost...@goodmis.org> wrote: > > > > > >> r8 = return address > >> r9 = function to call > >> > > > > Bad example, r8 and r9 are args, but r10 and r11 are available. > > > > -- Steve > > > >> push r8 > >> jmp *r9 > >> > >> Then have the regs->ip point to that trampoline. > > Cute. That’ll need ORC annotations and some kind of retpoline to replace the > indirect jump, though.
I'm going with this idea, but the BP is so rare that I really don't see why a retpoline would be needed. -- Josh
