Re: [PATCH v2 4/4] x86/static_call: Add inline static call implementation for x86-64

Andy Lutomirski
2018-11-29T17:41:38Z

> On Nov 29, 2018, at 9:21 AM, Steven Rostedt <rostedt@goodmis.org> wrote:
>
> On Thu, 29 Nov 2018 12:20:00 -0500
> Steven Rostedt <rostedt@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.

>>
>> -- Steve
>