1 // SPDX-License-Identifier: GPL-2.0-only
6  * Copyright (C) 1995-2004 Russell King
19 #include <linux/page-flags.h>
33 #include <asm/debug-monitors.h>
108 		return __pa_symbol(mm->pgd);  in mm_to_pgd_phys()
110 	return (unsigned long)virt_to_phys(mm->pgd);  in mm_to_pgd_phys()
124 		mm = current->active_mm;  in show_pte()
139 	pr_alert("%s pgtable: %luk pages, %llu-bit VAs, pgdp=%016lx\n",  in show_pte()
188  * like set_pte_at(), the PTE is never changed from no-exec to exec here.
221 	/* Invalidate a stale read-only entry */  in ptep_set_access_flags()
246 			(regs->pstate & PSR_PAN_BIT);  in is_el1_permission_fault()
317 			msg = "write to read-only memory";  in __do_kernel_fault()
319 			msg = "execute from non-executable memory";  in __do_kernel_fault()
333 	current->thread.fault_address = address;  in set_thread_esr()
337 	 * From userspace's point of view, kernel-only mappings don't exist  in set_thread_esr()
347 	if (!is_ttbr0_addr(current->thread.fault_address)) {  in set_thread_esr()
353 			 * We explicitly clear bits which are architecturally  in set_thread_esr()
366 			 * All other bits are architecturally RES0 for faults  in set_thread_esr()
385 	current->thread.fault_code = esr;  in set_thread_esr()
398 		arm64_force_sig_fault(inf->sig, inf->code, (void __user *)addr,  in do_bad_area()
399 				      inf->name);  in do_bad_area()
421 	if (unlikely(vma->vm_start > addr)) {  in __do_page_fault()
422 		if (!(vma->vm_flags & VM_GROWSDOWN))  in __do_page_fault()
432 	if (!(vma->vm_flags & vm_flags))  in __do_page_fault()
455 	struct mm_struct *mm = current->mm;  in do_page_fault()
482 		/* regs->orig_addr_limit may be 0 if we entered from EL0 */  in do_page_fault()
483 		if (regs->orig_addr_limit == KERNEL_DS)  in do_page_fault()
491 		if (!search_exception_tables(regs->pc))  in do_page_fault()
500 	 * validly references user space from well defined areas of the code,  in do_page_fault()
504 		if (!user_mode(regs) && !search_exception_tables(regs->pc))  in do_page_fault()
515 		if (!user_mode(regs) && !search_exception_tables(regs->pc)) {  in do_page_fault()
557 		 * oom-killed).  in do_page_fault()
571 				      inf->name);  in do_page_fault()
580 				       inf->name);  in do_page_fault()
589 				      inf->name);  in do_page_fault()
631 		 * APEI claimed this as a firmware-first notification.  in do_sea()
641 	arm64_notify_die(inf->name, regs, inf->sig, inf->code, siaddr, esr);  in do_sea()
724 	if (!inf->fn(addr, esr, regs))  in do_mem_abort()
733 	arm64_notify_die(inf->name, regs,  in do_mem_abort()
734 			 inf->sig, inf->code, (void __user *)addr, esr);  in do_mem_abort()
758  * See traps.c and debug-monitors.c:debug_traps_init().
762 	{ do_bad,	SIGTRAP,	TRAP_HWBKPT,	"hardware single-step"	},
818 	 * that interrupts are re-enabled on the syscall path. Return back  in cortex_a76_erratum_1463225_debug_handler()
823 	regs->pstate |= PSR_D_BIT;  in cortex_a76_erratum_1463225_debug_handler()
848 	if (inf->fn(addr_if_watchpoint, esr, regs)) {  in do_debug_exception()
849 		arm64_notify_die(inf->name, regs,  in do_debug_exception()
850 				 inf->sig, inf->code, (void __user *)pc, esr);  in do_debug_exception()