1 // SPDX-License-Identifier: GPL-2.0-only
3  * Traps/Non-MMU Exception handling for ARC
5  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
8  *  -user-space unaligned access emulation
19 #include <asm/entry.h>
25 void die(const char *str, struct pt_regs *regs, unsigned long address)  in die()  argument
27 	show_kernel_fault_diag(str, regs, address);  in die()
35  *  -for user faults enqueues requested signal
36  *  -for kernel, chk if due to copy_(to|from)_user, otherwise die()
45 		tsk->thread.fault_address = (__force unsigned int)addr;  in unhandled_exception()
61 int name(unsigned long address, struct pt_regs *regs) \
64 				   (void __user *)address);	\
68  * Entry points for exceptions NOT needing specific handling
79  * Entry Point for Misaligned Data access Exception, for emulating in software
81 int do_misaligned_access(unsigned long address, struct pt_regs *regs,  in do_misaligned_access()  argument
85 	if (misaligned_fixup(address, regs, cregs) != 0)  in do_misaligned_access()
86 		return do_misaligned_error(address, regs);  in do_misaligned_access()
92  * Entry point for miscll errors such as Nested Exceptions
93  *  -Duplicate TLB entry is handled separately though
95 void do_machine_check_fault(unsigned long address, struct pt_regs *regs)  in do_machine_check_fault()  argument
97 	die("Unhandled Machine Check Exception", regs, address);  in do_machine_check_fault()
102  * Entry point for traps induced by ARCompact TRAP_S <n> insn
107  *  -1 used for software breakpointing (gdb)
108  *  -2 used by kprobes
109  *  -5 __builtin_trap() generated by gcc (2018.03 onwards) for toggle such as
110  *     -fno-isolate-erroneous-paths-dereference
112 void do_non_swi_trap(unsigned long address, struct pt_regs *regs)  in do_non_swi_trap()  argument
114 	switch (regs->ecr.param) {  in do_non_swi_trap()
116 		trap_is_brkpt(address, regs);  in do_non_swi_trap()
120 		trap_is_kprobe(address, regs);  in do_non_swi_trap()
129 		do_trap5_error(address, regs);  in do_non_swi_trap()
137  * Entry point for Instruction Error Exception
138  *  -For a corner case, ARC kprobes implementation resorts to using
141 void do_insterror_or_kprobe(unsigned long address, struct pt_regs *regs)  in do_insterror_or_kprobe()  argument
146 	rc = notify_die(DIE_IERR, "kprobe_ierr", regs, address, 0, SIGILL);  in do_insterror_or_kprobe()
150 	insterror_is_error(address, regs);  in do_insterror_or_kprobe()