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
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