1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 1995-2009 Russell King
79 		frame = ((unsigned long *)frame)[-2] - 4;  in dump_backtrace_entry()
103 	for (reg = 10, x = 0, p = str; reg >= 0; reg--) {  in dump_backtrace_stm()
105 			p += sprintf(p, " r%d:%08x", reg, *stack--);  in dump_backtrace_stm()
120  * physical memory.  If it is not there, then we can't dump
128 		return -EFAULT;  in verify_stack()
135  * Dump out the contents of some memory nicely...
150 		str[sizeof(str) - 1] = '\0';  in dump_mem()
174 	 * Note that we now dump the code first, just in case the backtrace  in dump_instr()
178 	for (i = -4; i < 1 + !!thumb; i++) {  in dump_instr()
240 		pr_cont("no frame pointer");  in dump_backtrace()
288 	ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, SIGSEGV);  in __die()
296 		 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), end_of_stack(tsk));  in __die()
299 		dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,  in __die()
300 			 ALIGN(regs->ARM_sp - THREAD_SIZE, THREAD_ALIGN)  in __die()
310 static int die_owner = -1;
325 			/* nested oops. should stop eventually */;  in oops_begin()
342 	die_owner = -1;  in oops_end()
344 	die_nest_count--;  in oops_end()
360  * This function is protected against re-entrancy.
369 		bug_type = report_bug(regs->ARM_pc, regs);  in die()
371 		str = "Oops - BUG";  in die()
384 		current->thread.error_code = err;  in arm_notify_die()
385 		current->thread.trap_no = trap;  in arm_notify_die()
421 	list_add(&hook->node, &undef_hook);  in register_undef_hook()
430 	list_del(&hook->node);  in unregister_undef_hook()
443 		if ((instr & hook->instr_mask) == hook->instr_val &&  in call_undef_hook()
444 		    (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val)  in call_undef_hook()
445 			fn = hook->fn;  in call_undef_hook()
494 			current->comm, task_pid_nr(current), pc);  in do_undefinstr()
499 	arm_notify_die("Oops - undefined instruction", regs,  in do_undefinstr()
508  * (NMIs can pre-empt critical sections meaning almost all locking is  in NOKPROBE_SYMBOL()
510  * circumstances where non-maskability improves robustness, such as  in NOKPROBE_SYMBOL()
533  * dump out some state information...
541 	die("Oops - bad mode", regs, 0);  in bad_mode()
548 	if ((current->personality & PER_MASK) != PER_LINUX) {  in bad_syscall()
550 		return regs->ARM_r0;  in bad_syscall()
556 			task_pid_nr(current), current->comm, n);  in bad_syscall()
561 	arm_notify_die("Oops - bad syscall", regs, SIGILL, ILL_ILLTRP,  in bad_syscall()
562 		       (void __user *)instruction_pointer(regs) -  in bad_syscall()
566 	return regs->ARM_r0;  in bad_syscall()
575 		unsigned long chunk = min(PAGE_SIZE, end - start);  in __do_cache_op()
595 		return -EINVAL;  in do_cache_op()
597 	if (!access_ok((void __user *)start, end - start))  in do_cache_op()
598 		return -EFAULT;  in do_cache_op()
605  *  0x9f0000 - 0x9fffff are some more esoteric system calls
607 #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
608 asmlinkage int arm_syscall(int no, struct pt_regs *regs)  in arm_syscall()  argument
610 	if ((no >> 16) != (__ARM_NR_BASE>> 16))  in arm_syscall()
611 		return bad_syscall(no, regs);  in arm_syscall()
613 	switch (no & 0xffff) {  in arm_syscall()
620 		regs->ARM_pc -= thumb_mode(regs) ? 2 : 4;  in arm_syscall()
622 		return regs->ARM_r0;  in arm_syscall()
626 	 * _exclusive_.  There is no alignment requirement on either address;  in arm_syscall()
639 		return do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);  in arm_syscall()
644 		regs->ARM_cpsr &= ~MODE32_BIT;  in arm_syscall()
645 		return regs->ARM_r0;  in arm_syscall()
650 		regs->ARM_cpsr |= MODE32_BIT;  in arm_syscall()
651 		return regs->ARM_r0;  in arm_syscall()
654 		set_tls(regs->ARM_r0);  in arm_syscall()
658 		return current_thread_info()->tp_value[0];  in arm_syscall()
661 		/* Calls 9f00xx..9f07ff are defined to return -ENOSYS  in arm_syscall()
665 		if ((no & 0xffff) <= 0x7ff)  in arm_syscall()
666 			return -ENOSYS;  in arm_syscall()
676 		       task_pid_nr(current), current->comm, no);  in arm_syscall()
684 	arm_notify_die("Oops - bad syscall(2)", regs, SIGILL, ILL_ILLTRP,  in arm_syscall()
685 		       (void __user *)instruction_pointer(regs) -  in arm_syscall()
687 		       no, 0);  in arm_syscall()
696  * using a pre-ARMv6 processor (there are apparently a few prototypes like
706 	regs->uregs[reg] = current_thread_info()->tp_value[0];  in get_tp_trap()
707 	regs->ARM_pc += 4;  in get_tp_trap()
740 		pr_err("8<--- cut here ---\n");  in baddataabort()
742 		       task_pid_nr(current), current->comm, code, instr);  in baddataabort()
744 		show_pte(KERN_ERR, current->mm, addr);  in baddataabort()
788 	panic("Oops failed to kill thread");  in abort()
795 	int kuser_sz = __kuser_helper_end - __kuser_helper_start;  in kuser_init()
797 	memcpy(vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);  in kuser_init()
815 	memcpy(vma, lma_start, lma_end - lma_start);  in copy_from_lma()
834 		pr_err("CPU%u: Spectre BHB workaround too late - system vulnerable\n",  in spectre_bhb_update_vectors()
857 	flush_vectors(vectors_page, 0, vec_end - vec_start);  in spectre_bhb_update_vectors()
881 	 * Copy the vectors, stubs and kuser helpers (in entry-armv.S)  in early_trap_init()
896 	 * on V7-M there is no need to copy the vector table to a dedicated  in early_trap_init()
917 			return -ENOMEM;  in allocate_overflow_stacks()
926 	unsigned long tsk_stk = (unsigned long)current->stack;  in handle_bad_stack()
939 		 irq_stk - THREAD_SIZE, irq_stk);  in handle_bad_stack()
942 		 ovf_stk - OVERFLOW_STACK_SIZE, ovf_stk);  in handle_bad_stack()