3  * Based on arch/arm/mm/fault.c
293 	 * If we now have a valid translation, treat the translation fault as  in is_spurious_el1_translation_fault()
300 	 * If we got a different type of fault from the AT instruction,  in is_spurious_el1_translation_fault()
301 	 * treat the translation fault as spurious.  in is_spurious_el1_translation_fault()
351 	 * tag fault.  in do_tag_recovery()
382 	 * Are we prepared to handle this kernel fault?  in __do_kernel_fault()
389 	    "Ignoring spurious kernel translation fault at virtual address %016lx\n", addr))  in __do_kernel_fault()
430 	 * an alignment fault not caused by the memory type would take  in set_thread_esr()
431 	 * precedence over translation fault for a real access to empty  in set_thread_esr()
432 	 * space. Unfortunately we can't easily distinguish "alignment fault  in set_thread_esr()
433 	 * not caused by memory type" from "alignment fault caused by memory  in set_thread_esr()
435 	 * fault.)  in set_thread_esr()
445 			 * We always report the ESR as if the fault was taken  in set_thread_esr()
447 			 * clear. (In fact it always will be a fault to EL1.)  in set_thread_esr()
455 			 * Claim a level 0 translation fault.  in set_thread_esr()
485 	 * handle this fault with.  in do_bad_area()
508 	 * Check that the permissions on the VMA allow for the fault which  in __do_page_fault()
523  * should fault. EL0 cannot issue DC IVAC (undef).
535 	vm_fault_t fault;  in do_page_fault()  local
546 	 * the fault.  in do_page_fault()
556 	 * for the fault to be benign, __do_page_fault() would check  in do_page_fault()
561 		/* It was exec fault */  in do_page_fault()
565 		/* It was write fault */  in do_page_fault()
569 		/* It was read fault */  in do_page_fault()
601 	fault = handle_mm_fault(vma, addr, mm_flags | FAULT_FLAG_VMA_LOCK, regs);  in do_page_fault()
602 	if (!(fault & (VM_FAULT_RETRY | VM_FAULT_COMPLETED)))  in do_page_fault()
605 	if (!(fault & VM_FAULT_RETRY)) {  in do_page_fault()
610 	if (fault & VM_FAULT_MAJOR)  in do_page_fault()
614 	if (fault_signal_pending(fault, regs)) {  in do_page_fault()
624 		fault = VM_FAULT_BADMAP;  in do_page_fault()
628 	fault = __do_page_fault(mm, vma, addr, mm_flags, vm_flags, regs);  in do_page_fault()
631 	if (fault_signal_pending(fault, regs)) {  in do_page_fault()
637 	/* The fault is fully completed (including releasing mmap lock) */  in do_page_fault()
638 	if (fault & VM_FAULT_COMPLETED)  in do_page_fault()
641 	if (fault & VM_FAULT_RETRY) {  in do_page_fault()
651 	if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP |  in do_page_fault()
657 	 * handle this fault with.  in do_page_fault()
662 	if (fault & VM_FAULT_OOM) {  in do_page_fault()
665 		 * userspace (which will retry the fault, or kill us if we got  in do_page_fault()
674 	if (fault & VM_FAULT_SIGBUS) {  in do_page_fault()
677 		 * this page fault.  in do_page_fault()
680 	} else if (fault & (VM_FAULT_HWPOISON_LARGE | VM_FAULT_HWPOISON)) {  in do_page_fault()
684 		if (fault & VM_FAULT_HWPOISON_LARGE)  in do_page_fault()
685 			lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));  in do_page_fault()
694 				      fault == VM_FAULT_BADACCESS ? SEGV_ACCERR : SEGV_MAPERR,  in do_page_fault()
730 	return 1; /* "fault" */  in do_bad()
777 	{ do_bad,		SIGKILL, SI_KERNEL,	"ttbr address size fault"	},
778 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 1 address size fault"	},
779 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 2 address size fault"	},
780 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 3 address size fault"	},
781 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 0 translation fault"	},
782 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 1 translation fault"	},
783 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 2 translation fault"	},
784 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 3 translation fault"	},
786 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 access flag fault"	},
787 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 access flag fault"	},
788 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 access flag fault"	},
790 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 permission fault"	},
791 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 permission fault"	},
792 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 permission fault"	},
794 	{ do_tag_check_fault,	SIGSEGV, SEGV_MTESERR,	"synchronous tag check fault"	},
810 	{ do_alignment_fault,	SIGBUS,  BUS_ADRALN,	"alignment fault"		},
826 	{ do_bad,		SIGKILL, SI_KERNEL,	"Unsupported atomic hardware update fault"	},
829 	{ do_bad,		SIGKILL, SI_KERNEL,	"implementation fault (lockdown abort)" },
830 	{ do_bad,		SIGBUS,  BUS_OBJERR,	"implementation fault (unsupported exclusive)" },
838 	{ do_bad,		SIGKILL, SI_KERNEL,	"section domain fault"		},
839 	{ do_bad,		SIGKILL, SI_KERNEL,	"page domain fault"		},
855 	 * At this point we have an unrecognized fault type whose tag bits may  in do_mem_abort()
940  * Used during anonymous page fault handling.