1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 */
5
6#ifndef _ASM_RISCV_BUG_H
7#define _ASM_RISCV_BUG_H
8
9#include <linux/compiler.h>
10#include <linux/const.h>
11#include <linux/types.h>
12
13#include <asm/asm.h>
14
15#define __INSN_LENGTH_MASK  _UL(0x3)
16#define __INSN_LENGTH_32    _UL(0x3)
17#define __COMPRESSED_INSN_MASK	_UL(0xffff)
18
19#define __BUG_INSN_32	_UL(0x00100073) /* ebreak */
20#define __BUG_INSN_16	_UL(0x9002) /* c.ebreak */
21
22#define GET_INSN_LENGTH(insn)						\
23({									\
24	unsigned long __len;						\
25	__len = ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ?	\
26		4UL : 2UL;						\
27	__len;								\
28})
29
30typedef u32 bug_insn_t;
31
32#ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
33#define __BUG_ENTRY_ADDR	RISCV_INT " 1b - ."
34#define __BUG_ENTRY_FILE	RISCV_INT " %0 - ."
35#else
36#define __BUG_ENTRY_ADDR	RISCV_PTR " 1b"
37#define __BUG_ENTRY_FILE	RISCV_PTR " %0"
38#endif
39
40#ifdef CONFIG_DEBUG_BUGVERBOSE
41#define __BUG_ENTRY			\
42	__BUG_ENTRY_ADDR "\n\t"		\
43	__BUG_ENTRY_FILE "\n\t"		\
44	RISCV_SHORT " %1\n\t"		\
45	RISCV_SHORT " %2"
46#else
47#define __BUG_ENTRY			\
48	__BUG_ENTRY_ADDR "\n\t"		\
49	RISCV_SHORT " %2"
50#endif
51
52#ifdef CONFIG_GENERIC_BUG
53#define __BUG_FLAGS(flags)					\
54do {								\
55	__asm__ __volatile__ (					\
56		"1:\n\t"					\
57			"ebreak\n"				\
58			".pushsection __bug_table,\"aw\"\n\t"	\
59		"2:\n\t"					\
60			__BUG_ENTRY "\n\t"			\
61			".org 2b + %3\n\t"                      \
62			".popsection"				\
63		:						\
64		: "i" (__FILE__), "i" (__LINE__),		\
65		  "i" (flags),					\
66		  "i" (sizeof(struct bug_entry)));              \
67} while (0)
68#else /* CONFIG_GENERIC_BUG */
69#define __BUG_FLAGS(flags) do {					\
70	__asm__ __volatile__ ("ebreak\n");			\
71} while (0)
72#endif /* CONFIG_GENERIC_BUG */
73
74#define BUG() do {						\
75	__BUG_FLAGS(0);						\
76	unreachable();						\
77} while (0)
78
79#define __WARN_FLAGS(flags) __BUG_FLAGS(BUGFLAG_WARNING|(flags))
80
81#define HAVE_ARCH_BUG
82
83#include <asm-generic/bug.h>
84
85struct pt_regs;
86struct task_struct;
87
88void __show_regs(struct pt_regs *regs);
89void die(struct pt_regs *regs, const char *str);
90void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr);
91
92#endif /* _ASM_RISCV_BUG_H */
93