On Thu, May 09, 2019 at 01:37:42PM -0400, Steven Rostedt wrote: > On Thu, May 09, 2019 at 10:14:31AM +0200, Peter Zijlstra wrote: > > > > Right; I already fixed that in my patch changing i386's pt_regs. > > > > But what I'd love to do is something like the belwo patch, and make all > > the trampolines (very much including ftrace) use that. Such that we then > > only have 1 copy of this magic (well, 2 because x86_64 also needs an > > implementation of this of course). > > > > Changing ftrace over to this would be a little more work but it can > > easily chain things a little to get its original context back: > > > > ENTRY(ftrace_regs_caller) > > GLOBAL(ftrace_regs_func) > > push ftrace_stub > > push ftrace_regs_handler > > Note, ftrace_stub is dynamically modified to remove any indirect calls. Yeah, I realized that a few hours after I send this out; as you might have seen by the IRC chatter on this. Still, maybe we can wrap the thing in a .macro and reuse things that way. Because I really hate there are at least 3 (x2 for x86_64) copies of this around.
