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.
