Re: [PATCHv2 7/8] arm64: implement ftrace with regs

[Mark Rutland]

On Sat, Nov 02, 2019 at 05:51:46PM +0530, Amit Daniel Kachhap wrote:
> On 10/29/19 10:28 PM, Mark Rutland wrote:
> > +/*
> > + * Due to -fpatchable-function-entry=2, the compiler has placed two NOPs before
> > + * the regular function prologue. For an enabled callsite, ftrace_init_nop() and
> > + * ftrace_make_call() have patched those NOPs to:
> > + *
> > + * 	MOV	X9, LR
> > + * 	BL	<entry>
> > + *
> > + * ... where <entry> is either ftrace_caller or ftrace_regs_caller.
> > + *
> > + * Each instrumented function follows the AAPCS, so here x0-x8 and x19-x30 are
> > + * live, and x9-x18 are safe to clobber.
> > + *
> > + * We save the callsite's context into a pt_regs before invoking and ftrace

> s/invoking and ftrace callbacks/invoking the ftrace callbacks

Whoops, that was meant to be 'any'. I've fixed that up locally.

Thanks,
Mark.