1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 1995-2009 Russell King
80 		frame = ((unsigned long *)frame)[-2] - 4;  in dump_backtrace_entry()
104 	for (reg = 10, x = 0, p = str; reg >= 0; reg--) {  in dump_backtrace_stm()
106 			p += sprintf(p, " r%d:%08x", reg, *stack--);  in dump_backtrace_stm()
121  * physical memory.  If it is not there, then we can't dump
129 		return -EFAULT;  in verify_stack()
136  * Dump out the contents of some memory nicely...
151 		str[sizeof(str) - 1] = '\0';  in dump_mem()
175 	 * Note that we now dump the code first, just in case the backtrace  in dump_instr()
179 	for (i = -4; i < 1 + !!thumb; i++) {  in dump_instr()
241 		pr_cont("no frame pointer");  in dump_backtrace()
289 	ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, SIGSEGV);  in __die()
297 		 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), end_of_stack(tsk));  in __die()
300 		dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,  in __die()
301 			 ALIGN(regs->ARM_sp - THREAD_SIZE, THREAD_ALIGN)  in __die()
311 static int die_owner = -1;
326 			/* nested oops. should stop eventually */;  in oops_begin()
343 	die_owner = -1;  in oops_end()
345 	die_nest_count--;  in oops_end()
361  * This function is protected against re-entrancy.
370 		bug_type = report_bug(regs->ARM_pc, regs);  in die()
372 		str = "Oops - BUG";  in die()
385 		current->thread.error_code = err;  in arm_notify_die()
386 		current->thread.trap_no = trap;  in arm_notify_die()
422 	list_add(&hook->node, &undef_hook);  in register_undef_hook()
431 	list_del(&hook->node);  in unregister_undef_hook()
444 		if ((instr & hook->instr_mask) == hook->instr_val &&  in call_undef_hook()
445 		    (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val)  in call_undef_hook()
446 			fn = hook->fn;  in call_undef_hook()
495 			current->comm, task_pid_nr(current), pc);  in do_undefinstr()
500 	arm_notify_die("Oops - undefined instruction", regs,  in do_undefinstr()
509  * (NMIs can pre-empt critical sections meaning almost all locking is  in NOKPROBE_SYMBOL()
511  * circumstances where non-maskability improves robustness, such as  in NOKPROBE_SYMBOL()
534  * dump out some state information...
542 	die("Oops - bad mode", regs, 0);  in bad_mode()
549 	if ((current->personality & PER_MASK) != PER_LINUX) {  in bad_syscall()
551 		return regs->ARM_r0;  in bad_syscall()
557 			task_pid_nr(current), current->comm, n);  in bad_syscall()
562 	arm_notify_die("Oops - bad syscall", regs, SIGILL, ILL_ILLTRP,  in bad_syscall()
563 		       (void __user *)instruction_pointer(regs) -  in bad_syscall()
567 	return regs->ARM_r0;  in bad_syscall()
577 		unsigned long chunk = min(PAGE_SIZE, end - start);  in __do_cache_op()
599 		return -EINVAL;  in do_cache_op()
601 	if (!access_ok((void __user *)start, end - start))  in do_cache_op()
602 		return -EFAULT;  in do_cache_op()
609  *  0x9f0000 - 0x9fffff are some more esoteric system calls
611 #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
612 asmlinkage int arm_syscall(int no, struct pt_regs *regs)  in arm_syscall()  argument
614 	if ((no >> 16) != (__ARM_NR_BASE>> 16))  in arm_syscall()
615 		return bad_syscall(no, regs);  in arm_syscall()
617 	switch (no & 0xffff) {  in arm_syscall()
624 		regs->ARM_pc -= thumb_mode(regs) ? 2 : 4;  in arm_syscall()
626 		return regs->ARM_r0;  in arm_syscall()
630 	 * _exclusive_.  There is no alignment requirement on either address;  in arm_syscall()
643 		return do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);  in arm_syscall()
648 		regs->ARM_cpsr &= ~MODE32_BIT;  in arm_syscall()
649 		return regs->ARM_r0;  in arm_syscall()
654 		regs->ARM_cpsr |= MODE32_BIT;  in arm_syscall()
655 		return regs->ARM_r0;  in arm_syscall()
658 		set_tls(regs->ARM_r0);  in arm_syscall()
662 		return current_thread_info()->tp_value[0];  in arm_syscall()
665 		/* Calls 9f00xx..9f07ff are defined to return -ENOSYS  in arm_syscall()
669 		if ((no & 0xffff) <= 0x7ff)  in arm_syscall()
670 			return -ENOSYS;  in arm_syscall()
680 		       task_pid_nr(current), current->comm, no);  in arm_syscall()
688 	arm_notify_die("Oops - bad syscall(2)", regs, SIGILL, ILL_ILLTRP,  in arm_syscall()
689 		       (void __user *)instruction_pointer(regs) -  in arm_syscall()
691 		       no, 0);  in arm_syscall()
700  * using a pre-ARMv6 processor (there are apparently a few prototypes like
710 	regs->uregs[reg] = current_thread_info()->tp_value[0];  in get_tp_trap()
711 	regs->ARM_pc += 4;  in get_tp_trap()
744 		pr_err("8<--- cut here ---\n");  in baddataabort()
746 		       task_pid_nr(current), current->comm, code, instr);  in baddataabort()
748 		show_pte(KERN_ERR, current->mm, addr);  in baddataabort()
792 	panic("Oops failed to kill thread");  in abort()
799 	int kuser_sz = __kuser_helper_end - __kuser_helper_start;  in kuser_init()
801 	memcpy(vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);  in kuser_init()
819 	memcpy(vma, lma_start, lma_end - lma_start);  in copy_from_lma()
838 		pr_err("CPU%u: Spectre BHB workaround too late - system vulnerable\n",  in spectre_bhb_update_vectors()
861 	flush_vectors(vectors_page, 0, vec_end - vec_start);  in spectre_bhb_update_vectors()
885 	 * Copy the vectors, stubs and kuser helpers (in entry-armv.S)  in early_trap_init()
900 	 * on V7-M there is no need to copy the vector table to a dedicated  in early_trap_init()
921 			return -ENOMEM;  in allocate_overflow_stacks()
930 	unsigned long tsk_stk = (unsigned long)current->stack;  in handle_bad_stack()
943 		 irq_stk - THREAD_SIZE, irq_stk);  in handle_bad_stack()
946 		 ovf_stk - OVERFLOW_STACK_SIZE, ovf_stk);  in handle_bad_stack()