bug.h

 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(file)	RISCV_INT " " file " - ."
35#else
36#define __BUG_ENTRY_ADDR	RISCV_PTR " 1b"
37#define __BUG_ENTRY_FILE(file)	RISCV_PTR " " file
38#endif
39
40#ifdef CONFIG_DEBUG_BUGVERBOSE
41#define __BUG_ENTRY(file, line, flags)	\
42	__BUG_ENTRY_ADDR "\n\t"		\
43	__BUG_ENTRY_FILE(file) "\n\t"	\
44	RISCV_SHORT " " line "\n\t"	\
45	RISCV_SHORT " " flags
46#else
47#define __BUG_ENTRY(file, line, flags)		\
48	__BUG_ENTRY_ADDR "\n\t"			\
49	RISCV_SHORT " " flags
50#endif
51
52#ifdef CONFIG_GENERIC_BUG
53
54#define ARCH_WARN_ASM(file, line, flags, size)			\
55		"1:\n\t"					\
56			"ebreak\n"				\
57			".pushsection __bug_table,\"aw\"\n\t"	\
58		"2:\n\t"					\
59		__BUG_ENTRY(file, line, flags) "\n\t"		\
60			".org 2b + " size "\n\t"                \
61			".popsection"				\
62
63#define __BUG_FLAGS(cond_str, flags)				\
64do {								\
65	__asm__ __volatile__ (					\
66		ARCH_WARN_ASM("%0", "%1", "%2", "%3")		\
67		:						\
68		: "i" (WARN_CONDITION_STR(cond_str) __FILE__), "i" (__LINE__),	\
69		  "i" (flags),					\
70		  "i" (sizeof(struct bug_entry)));              \
71} while (0)
72
73#else /* CONFIG_GENERIC_BUG */
74#define __BUG_FLAGS(cond_str, flags) do {			\
75	__asm__ __volatile__ ("ebreak\n");			\
76} while (0)
77#endif /* CONFIG_GENERIC_BUG */
78
79#define BUG() do {						\
80	__BUG_FLAGS("", 0);					\
81	unreachable();						\
82} while (0)
83
84#define __WARN_FLAGS(cond_str, flags) __BUG_FLAGS(cond_str, BUGFLAG_WARNING|(flags))
85
86#define ARCH_WARN_REACHABLE
87
88#define HAVE_ARCH_BUG
89
90#include <asm-generic/bug.h>
91
92struct pt_regs;
93struct task_struct;
94
95void __show_regs(struct pt_regs *regs);
96void die(struct pt_regs *regs, const char *str);
97void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr);
98
99#endif /* _ASM_RISCV_BUG_H */