1 // SPDX-License-Identifier: GPL-2.0-only
6  * Copyright (C) 1995-2004 Russell King
21 #include <linux/page-flags.h>
36 #include <asm/debug-monitors.h>
115 		 esr_to_fault_info(esr)->name);  in mem_abort_decode()
125 		return __pa_symbol(mm->pgd);  in mm_to_pgd_phys()
127 	return (unsigned long)virt_to_phys(mm->pgd);  in mm_to_pgd_phys()
141 		mm = current->active_mm;  in show_pte()
143 			pr_alert("[%016lx] user address but active_mm is swapper\n",  in show_pte()
151 		pr_alert("[%016lx] address between user and kernel address ranges\n",  in show_pte()
156 	pr_alert("%s pgtable: %luk pages, %llu-bit VAs, pgdp=%016lx\n",  in show_pte()
208  * like set_pte_at(), the PTE is never changed from no-exec to exec here.
213 			  unsigned long address, pte_t *ptep,  in ptep_set_access_flags()  argument
241 	/* Invalidate a stale read-only entry */  in ptep_set_access_flags()
243 		flush_tlb_page(vma, address);  in ptep_set_access_flags()
270 			(regs->pstate & PSR_PAN_BIT);  in is_el1_permission_fault()
293 	 * If we now have a valid translation, treat the translation fault as  in is_spurious_el1_translation_fault()
301 	 * treat the translation fault as spurious.  in is_spurious_el1_translation_fault()
312 	pr_alert("Unable to handle kernel %s at virtual address %016lx\n", msg,  in die_kernel_fault()
334 	kasan_report((void *)addr, 0, is_write, regs->pc);  in report_tag_fault()
389 	    "Ignoring spurious kernel translation fault at virtual address %016lx\n", addr))  in __do_kernel_fault()
400 			msg = "write to read-only memory";  in __do_kernel_fault()
402 			msg = "execute from non-executable memory";  in __do_kernel_fault()
421 static void set_thread_esr(unsigned long address, unsigned long esr)  in set_thread_esr()  argument
423 	current->thread.fault_address = address;  in set_thread_esr()
426 	 * If the faulting address is in the kernel, we must sanitize the ESR.  in set_thread_esr()
427 	 * From userspace's point of view, kernel-only mappings don't exist  in set_thread_esr()
428 	 * at all, so we report them as level 0 translation faults.  in set_thread_esr()
431 	 * precedence over translation fault for a real access to empty  in set_thread_esr()
434 	 * type", so we ignore this wrinkle and just return the translation  in set_thread_esr()
437 	if (!is_ttbr0_addr(current->thread.fault_address)) {  in set_thread_esr()
455 			 * Claim a level 0 translation fault.  in set_thread_esr()
475 	current->thread.fault_code = esr;  in set_thread_esr()
491 		arm64_force_sig_fault(inf->sig, inf->code, far, inf->name);  in do_bad_area()
511 	if (!(vma->vm_flags & vm_flags))  in __do_page_fault()
534 	struct mm_struct *mm = current->mm;  in do_page_fault()
555 	 * vm_flags tells us what bits we must have in vma->vm_flags  in do_page_fault()
557 	 * vma->vm_flags & vm_flags and returns an error if the  in do_page_fault()
583 		if (!search_exception_tables(regs->pc))  in do_page_fault()
597 	if (!(vma->vm_flags & vm_flags)) {  in do_page_fault()
664 		 * oom-killed).  in do_page_fault()
677 		arm64_force_sig_fault(SIGBUS, BUS_ADRERR, far, inf->name);  in do_page_fault()
685 		arm64_force_sig_mceerr(BUS_MCEERR_AR, far, lsb, inf->name);  in do_page_fault()
693 				      far, inf->name);  in do_page_fault()
740 		 * APEI claimed this as a firmware-first notification.  in do_sea()
756 	arm64_notify_die(inf->name, regs, inf->sig, inf->code, siaddr, esr);  in do_sea()
767 	 * address.  in do_tag_check_fault()
775 	{ do_bad,		SIGKILL, SI_KERNEL,	"ttbr address size fault"	},
776 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 1 address size fault"	},
777 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 2 address size fault"	},
778 	{ do_bad,		SIGKILL, SI_KERNEL,	"level 3 address size fault"	},
779 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 0 translation fault"	},
780 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 1 translation fault"	},
781 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 2 translation fault"	},
782 	{ do_translation_fault,	SIGSEGV, SEGV_MAPERR,	"level 3 translation fault"	},
795 	{ do_sea,		SIGKILL, SI_KERNEL,	"level 0 (translation table walk)"	},
796 	{ do_sea,		SIGKILL, SI_KERNEL,	"level 1 (translation table walk)"	},
797 	{ do_sea,		SIGKILL, SI_KERNEL,	"level 2 (translation table walk)"	},
798 	{ do_sea,		SIGKILL, SI_KERNEL,	"level 3 (translation table walk)"	},
803 …{ do_sea,		SIGKILL, SI_KERNEL,	"level 0 synchronous parity error (translation table walk)"	},	// R…
804 …{ do_sea,		SIGKILL, SI_KERNEL,	"level 1 synchronous parity error (translation table walk)"	},	// R…
805 …{ do_sea,		SIGKILL, SI_KERNEL,	"level 2 synchronous parity error (translation table walk)"	},	// R…
806 …{ do_sea,		SIGKILL, SI_KERNEL,	"level 3 synchronous parity error (translation table walk)"	},	// R…
846 	if (!inf->fn(far, esr, regs))  in do_mem_abort()
850 		die_kernel_fault(inf->name, addr, esr, regs);  in do_mem_abort()
855 	 * address to the signal handler.  in do_mem_abort()
857 	arm64_notify_die(inf->name, regs, inf->sig, inf->code, addr, esr);  in do_mem_abort()
871  * See traps.c and debug-monitors.c:debug_traps_init().
875 	{ do_bad,	SIGTRAP,	TRAP_HWBKPT,	"hardware single-step"	},
929 	if (inf->fn(addr_if_watchpoint, esr, regs)) {  in do_debug_exception()
930 		arm64_notify_die(inf->name, regs, inf->sig, inf->code, pc, esr);  in do_debug_exception()
950 	if (vma->vm_flags & VM_MTE)  in vma_alloc_zeroed_movable_folio()