2  * Based on arch/arm/mm/fault.c
280 	 * Are we prepared to handle this kernel fault?  in __do_kernel_fault()
309 	 * an alignment fault not caused by the memory type would take  in __do_user_fault()
310 	 * precedence over translation fault for a real access to empty  in __do_user_fault()
311 	 * space. Unfortunately we can't easily distinguish "alignment fault  in __do_user_fault()
312 	 * not caused by memory type" from "alignment fault caused by memory  in __do_user_fault()
314 	 * fault.)  in __do_user_fault()
324 			 * We always report the ESR as if the fault was taken  in __do_user_fault()
326 			 * clear. (In fact it always will be a fault to EL1.)  in __do_user_fault()
334 			 * Claim a level 0 translation fault.  in __do_user_fault()
362 	 * handle this fault with.  in do_bad_area()
387 	vm_fault_t fault;  in __do_page_fault()  local
390 	fault = VM_FAULT_BADMAP;  in __do_page_fault()
402 	 * Check that the permissions on the VMA allow for the fault which  in __do_page_fault()
406 		fault = VM_FAULT_BADACCESS;  in __do_page_fault()
416 	return fault;  in __do_page_fault()
430 	vm_fault_t fault, major = 0;  in do_page_fault()  local
442 	 * the fault.  in do_page_fault()
496 	fault = __do_page_fault(mm, addr, mm_flags, vm_flags, tsk);  in do_page_fault()
497 	major |= fault & VM_FAULT_MAJOR;  in do_page_fault()
499 	if (fault & VM_FAULT_RETRY) {  in do_page_fault()
527 	if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP |  in do_page_fault()
530 		 * Major/minor page fault accounting is only done  in do_page_fault()
550 	 * handle this fault with.  in do_page_fault()
555 	if (fault & VM_FAULT_OOM) {  in do_page_fault()
558 		 * userspace (which will retry the fault, or kill us if we got  in do_page_fault()
568 	if (fault & VM_FAULT_SIGBUS) {  in do_page_fault()
571 		 * this page fault.  in do_page_fault()
575 	} else if (fault & VM_FAULT_HWPOISON_LARGE) {  in do_page_fault()
576 		unsigned int hindex = VM_FAULT_GET_HINDEX(fault);  in do_page_fault()
581 	} else if (fault & VM_FAULT_HWPOISON) {  in do_page_fault()
591 		si.si_code	= fault == VM_FAULT_BADACCESS ?  in do_page_fault()
623 	return 1; /* "fault" */  in do_bad()
662 	{ do_bad,		SIGKILL, SI_KERNEL,	"ttbr address size fault"	},
663 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 1 address size fault"	},
664 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 2 address size fault"	},
665 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 3 address size fault"	},
666 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 0 translation fault"	},
667 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 1 translation fault"	},
668 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 2 translation fault"	},
669 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 3 translation fault"	},
671 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 access flag fault"	},
672 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 access flag fault"	},
673 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 access flag fault"	},
675 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 permission fault"	},
676 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 permission fault"	},
677 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 permission fault"	},
695 	{ do_alignment_fault,	SIGBUS,  BUS_ADRALN,	"alignment fault"		},
711 	{ do_bad,		SIGKILL, SI_KERNEL,	"Unsupported atomic hardware update fault"	},
714 	{ do_bad,		SIGKILL, SI_KERNEL,	"implementation fault (lockdown abort)" },
715 	{ do_bad,		SIGBUS,  BUS_OBJERR,	"implementation fault (unsupported exclusive)" },
723 	{ do_bad,		SIGKILL, SI_KERNEL,	"section domain fault"		},
724 	{ do_bad,		SIGKILL, SI_KERNEL,	"page domain fault"		},
743 		pr_alert("Unhandled fault at 0x%016lx\n", addr);  in do_mem_abort()