1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 1995-2009 Russell King
89 	for (reg = 10, x = 0, p = str; reg >= 0; reg--) {  in dump_backtrace_stm()
91 			p += sprintf(p, " r%d:%08x", reg, *stack--);  in dump_backtrace_stm()
106  * physical memory.  If it is not there, then we can't dump
113 		return -EFAULT;  in verify_stack()
120  * Dump out the contents of some memory nicely...
131 	 * to safely read from kernel space.  Note that we now dump the  in dump_mem()
144 		str[sizeof(str) - 1] = '\0';  in dump_mem()
170 	 * Note that we now dump the code first, just in case the backtrace  in __dump_instr()
174 	for (i = -4; i < 1 + !!thumb; i++) {  in __dump_instr()
237 		pr_cont("no frame pointer");  in dump_backtrace()
285 	ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, SIGSEGV);  in __die()
292 		 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), end_of_stack(tsk));  in __die()
295 		dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,  in __die()
305 static int die_owner = -1;
320 			/* nested oops. should stop eventually */;  in oops_begin()
337 	die_owner = -1;  in oops_end()
339 	die_nest_count--;  in oops_end()
355  * This function is protected against re-entrancy.
364 		bug_type = report_bug(regs->ARM_pc, regs);  in die()
366 		str = "Oops - BUG";  in die()
379 		current->thread.error_code = err;  in arm_notify_die()
380 		current->thread.trap_no = trap;  in arm_notify_die()
416 	list_add(&hook->node, &undef_hook);  in register_undef_hook()
425 	list_del(&hook->node);  in unregister_undef_hook()
438 		if ((instr & hook->instr_mask) == hook->instr_val &&  in call_undef_hook()
439 		    (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val)  in call_undef_hook()
440 			fn = hook->fn;  in call_undef_hook()
489 			current->comm, task_pid_nr(current), pc);  in do_undefinstr()
494 	arm_notify_die("Oops - undefined instruction", regs,  in do_undefinstr()
503  * (NMIs can pre-empt critical sections meaning almost all locking is  in NOKPROBE_SYMBOL()
505  * circumstances where non-maskability improves robustness, such as  in NOKPROBE_SYMBOL()
528  * dump out some state information...
536 	die("Oops - bad mode", regs, 0);  in bad_mode()
543 	if ((current->personality & PER_MASK) != PER_LINUX) {  in bad_syscall()
545 		return regs->ARM_r0;  in bad_syscall()
551 			task_pid_nr(current), current->comm, n);  in bad_syscall()
556 	arm_notify_die("Oops - bad syscall", regs, SIGILL, ILL_ILLTRP,  in bad_syscall()
557 		       (void __user *)instruction_pointer(regs) -  in bad_syscall()
561 	return regs->ARM_r0;  in bad_syscall()
570 		unsigned long chunk = min(PAGE_SIZE, end - start);  in __do_cache_op()
590 		return -EINVAL;  in do_cache_op()
592 	if (!access_ok((void __user *)start, end - start))  in do_cache_op()
593 		return -EFAULT;  in do_cache_op()
600  *  0x9f0000 - 0x9fffff are some more esoteric system calls
602 #define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
603 asmlinkage int arm_syscall(int no, struct pt_regs *regs)  in arm_syscall()  argument
605 	if ((no >> 16) != (__ARM_NR_BASE>> 16))  in arm_syscall()
606 		return bad_syscall(no, regs);  in arm_syscall()
608 	switch (no & 0xffff) {  in arm_syscall()
615 		regs->ARM_pc -= thumb_mode(regs) ? 2 : 4;  in arm_syscall()
617 		return regs->ARM_r0;  in arm_syscall()
621 	 * _exclusive_.  There is no alignment requirement on either address;  in arm_syscall()
634 		return do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);  in arm_syscall()
639 		regs->ARM_cpsr &= ~MODE32_BIT;  in arm_syscall()
640 		return regs->ARM_r0;  in arm_syscall()
645 		regs->ARM_cpsr |= MODE32_BIT;  in arm_syscall()
646 		return regs->ARM_r0;  in arm_syscall()
649 		set_tls(regs->ARM_r0);  in arm_syscall()
653 		return current_thread_info()->tp_value[0];  in arm_syscall()
656 		/* Calls 9f00xx..9f07ff are defined to return -ENOSYS  in arm_syscall()
660 		if ((no & 0xffff) <= 0x7ff)  in arm_syscall()
661 			return -ENOSYS;  in arm_syscall()
671 		       task_pid_nr(current), current->comm, no);  in arm_syscall()
679 	arm_notify_die("Oops - bad syscall(2)", regs, SIGILL, ILL_ILLTRP,  in arm_syscall()
680 		       (void __user *)instruction_pointer(regs) -  in arm_syscall()
682 		       no, 0);  in arm_syscall()
691  * using a pre-ARMv6 processor (there are apparently a few prototypes like
701 	regs->uregs[reg] = current_thread_info()->tp_value[0];  in get_tp_trap()
702 	regs->ARM_pc += 4;  in get_tp_trap()
735 		pr_err("8<--- cut here ---\n");  in baddataabort()
737 		       task_pid_nr(current), current->comm, code, instr);  in baddataabort()
739 		show_pte(KERN_ERR, current->mm, addr);  in baddataabort()
781 	panic("Oops failed to kill thread");  in abort()
793 	int kuser_sz = __kuser_helper_end - __kuser_helper_start;  in kuser_init()
795 	memcpy(vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);  in kuser_init()
813 	memcpy(vma, lma_start, lma_end - lma_start);  in copy_from_lma()
832 		pr_err("CPU%u: Spectre BHB workaround too late - system vulnerable\n",  in spectre_bhb_update_vectors()
855 	flush_vectors(vectors_page, 0, vec_end - vec_start);  in spectre_bhb_update_vectors()
879 	 * Copy the vectors, stubs and kuser helpers (in entry-armv.S)  in early_trap_init()
894 	 * on V7-M there is no need to copy the vector table to a dedicated  in early_trap_init()