arc/kernel/traps.c

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
34  *  -for user faults enqueues requested signal
35  *  -for kernel, chk if due to copy_(to|from)_user, otherwise die()
44 		tsk->thread.fault_address = (__force unsigned int)addr;  in unhandled_exception()
75 DO_ERROR_INFO(SIGSEGV, "gcc generated __builtin_trap", do_trap5_error, 0)
78  * Entry Point for Misaligned Data access Exception, for emulating in software
92  *  -Duplicate TLB entry is handled seperately though
106  *  -1 used for software breakpointing (gdb)
107  *  -2 used by kprobes
108  *  -5 __builtin_trap() generated by gcc (2018.03 onwards) for toggle such as
109  *     -fno-isolate-erroneous-paths-dereference
113 	switch (regs->ecr.param) {  in do_non_swi_trap()
137  *  -For a corner case, ARC kprobes implementation resorts to using
153  * abort() call generated by older gcc for __builtin_trap()