bug.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_BUG_H
 3#define __ASM_BUG_H
 4
 5#include <asm/break.h>
 6#include <linux/stringify.h>
 7#include <linux/objtool.h>
 8
 9#ifndef CONFIG_DEBUG_BUGVERBOSE
10#define _BUGVERBOSE_LOCATION(file, line)
11#else
12#define __BUGVERBOSE_LOCATION(file, line)			\
13		.pushsection .rodata.str, "aMS", @progbits, 1;	\
14	10002:	.ascii file "\0";				\
15		.popsection;					\
16								\
17		.long 10002b - .;				\
18		.short line;
19#define _BUGVERBOSE_LOCATION(file, line) __BUGVERBOSE_LOCATION(file, line)
20#endif
21
22#ifndef CONFIG_GENERIC_BUG
23#define __BUG_ENTRY(cond_str, flags)
24#else
25#define __BUG_ENTRY(cond_str, flags)				\
26		.pushsection __bug_table, "aw";			\
27		.align 2;					\
28	10000:	.long 10001f - .;				\
29		_BUGVERBOSE_LOCATION(WARN_CONDITION_STR(cond_str) __FILE__, __LINE__) \
30		.short flags;					\
31		.popsection;					\
32	10001:
33#endif
34
35#define ASM_BUG_FLAGS(cond_str, flags)				\
36	__BUG_ENTRY(cond_str, flags)				\
37	break		BRK_BUG;
38
39#define ASM_BUG()	ASM_BUG_FLAGS("", 0)
40
41#define __BUG_FLAGS(cond_str, flags, extra)			\
42	asm_inline volatile (__stringify(ASM_BUG_FLAGS(cond_str, flags)) extra);
43
44#define __WARN_FLAGS(cond_str, flags)				\
45do {								\
46	instrumentation_begin();				\
47	__BUG_FLAGS(cond_str, BUGFLAG_WARNING|(flags), ANNOTATE_REACHABLE(10001b));\
48	instrumentation_end();					\
49} while (0)
50
51#define BUG()							\
52do {								\
53	instrumentation_begin();				\
54	__BUG_FLAGS("", 0, "");					\
55	unreachable();						\
56} while (0)
57
58#define HAVE_ARCH_BUG
59
60#include <asm-generic/bug.h>
61
62#endif /* __ASM_BUG_H */