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