1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_BUG_H
3 #define __ASM_SH_BUG_H
4
5 #include <linux/linkage.h>
6
7 #define TRAPA_BUG_OPCODE 0xc33e /* trapa #0x3e */
8 #define BUGFLAG_UNWINDER (1 << 1)
9
10 #ifdef CONFIG_GENERIC_BUG
11 #define HAVE_ARCH_BUG
12 #define HAVE_ARCH_WARN_ON
13
14 /**
15 * _EMIT_BUG_ENTRY
16 * %1 - __FILE__
17 * %2 - __LINE__
18 * %3 - trap type
19 * %4 - sizeof(struct bug_entry)
20 *
21 * The trapa opcode itself sits in %0.
22 * The %O notation is used to avoid # generation.
23 *
24 * The offending file and line are encoded in the __bug_table section.
25 */
26 #ifdef CONFIG_DEBUG_BUGVERBOSE
27 #define _EMIT_BUG_ENTRY \
28 "\t.pushsection __bug_table,\"aw\"\n" \
29 "2:\t.long 1b, %O1\n" \
30 "\t.short %O2, %O3\n" \
31 "\t.org 2b+%O4\n" \
32 "\t.popsection\n"
33 #else
34 #define _EMIT_BUG_ENTRY \
35 "\t.pushsection __bug_table,\"aw\"\n" \
36 "2:\t.long 1b\n" \
37 "\t.short %O3\n" \
38 "\t.org 2b+%O4\n" \
39 "\t.popsection\n"
40 #endif
41
42 #define BUG() \
43 do { \
44 __asm__ __volatile__ ( \
45 "1:\t.short %O0\n" \
46 _EMIT_BUG_ENTRY \
47 : \
48 : "n" (TRAPA_BUG_OPCODE), \
49 "i" (__FILE__), \
50 "i" (__LINE__), "i" (0), \
51 "i" (sizeof(struct bug_entry))); \
52 unreachable(); \
53 } while (0)
54
55 #define __WARN_FLAGS(flags) \
56 do { \
57 __asm__ __volatile__ ( \
58 "1:\t.short %O0\n" \
59 _EMIT_BUG_ENTRY \
60 : \
61 : "n" (TRAPA_BUG_OPCODE), \
62 "i" (__FILE__), \
63 "i" (__LINE__), \
64 "i" (BUGFLAG_WARNING|(flags)), \
65 "i" (sizeof(struct bug_entry))); \
66 } while (0)
67
68 #define WARN_ON(x) ({ \
69 int __ret_warn_on = !!(x); \
70 if (__builtin_constant_p(__ret_warn_on)) { \
71 if (__ret_warn_on) \
72 __WARN(); \
73 } else { \
74 if (unlikely(__ret_warn_on)) \
75 __WARN(); \
76 } \
77 unlikely(__ret_warn_on); \
78 })
79
80 #define UNWINDER_BUG() \
81 do { \
82 __asm__ __volatile__ ( \
83 "1:\t.short %O0\n" \
84 _EMIT_BUG_ENTRY \
85 : \
86 : "n" (TRAPA_BUG_OPCODE), \
87 "i" (__FILE__), \
88 "i" (__LINE__), \
89 "i" (BUGFLAG_UNWINDER), \
90 "i" (sizeof(struct bug_entry))); \
91 } while (0)
92
93 #define UNWINDER_BUG_ON(x) ({ \
94 int __ret_unwinder_on = !!(x); \
95 if (__builtin_constant_p(__ret_unwinder_on)) { \
96 if (__ret_unwinder_on) \
97 UNWINDER_BUG(); \
98 } else { \
99 if (unlikely(__ret_unwinder_on)) \
100 UNWINDER_BUG(); \
101 } \
102 unlikely(__ret_unwinder_on); \
103 })
104
105 #else
106
107 #define UNWINDER_BUG BUG
108 #define UNWINDER_BUG_ON BUG_ON
109
110 #endif /* CONFIG_GENERIC_BUG */
111
112 #include <asm-generic/bug.h>
113
114 struct pt_regs;
115
116 /* arch/sh/kernel/traps.c */
117 extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
118 extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
119 extern void die_if_no_fixup(const char *str, struct pt_regs *regs, long err);
120
121 #endif /* __ASM_SH_BUG_H */