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

[Andy Lutomirski]

> On Nov 29, 2018, at 9:21 AM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> 
> On Thu, 29 Nov 2018 12:20:00 -0500
> Steven Rostedt <rostedt@xxxxxxxxxxx> 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. Thatâll need ORC annotations and some kind of retpoline to replace the indirect jump, though.

>> 
>> -- Steve
>