+CC Masami San, Eugeniy On 6/13/19 10:57 AM, Vineet Gupta wrote: > On 6/13/19 3:07 AM, Anshuman Khandual wrote: >> Questions: >> >> AFAICT there is no equivalent of erstwhile notify_page_fault() during page >> fault handling in arc and mips archs which can call this generic function. >> Please let me know if that is not the case. > > For ARC do_page_fault() is entered for MMU exceptions (TLB Miss, access violations > r/w/x etc). kprobes uses a combination of UNIMP_S and TRAP_S instructions which > don't funnel into do_page_fault(). > > UINMP_S leads to > > instr_service > do_insterror_or_kprobe > notify_die(DIE_IERR) > kprobe_exceptions_notify > arc_kprobe_handler > > > TRAP_S 2 leads to > > EV_Trap > do_non_swi_trap > trap_is_kprobe > notify_die(DIE_TRAP) > kprobe_exceptions_notify > arc_post_kprobe_handler > > But indeed we are *not* calling into kprobe_fault_handler() - from eithet of those > paths and not sure if the existing arc*_kprobe_handler() combination does the > equivalent in tandem. @Eugeniy can you please investigate this - do we have krpobes bit rot in ARC port. -Vineet
