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 
30 typedef 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)					\
54 do {								\
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 
85 struct pt_regs;
86 struct task_struct;
87 
88 void __show_regs(struct pt_regs *regs);
89 void die(struct pt_regs *regs, const char *str);
90 void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr);
91 
92 #endif /* _ASM_RISCV_BUG_H */
93