1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_BUG_H
#define _ASM_X86_BUG_H
#include <linux/stringify.h>
#include <linux/instrumentation.h>
#include <linux/objtool.h>
/*
* Despite that some emulators terminate on UD2, we use it for WARN().
*/
#define ASM_UD2 ".byte 0x0f, 0x0b"
#define INSN_UD2 0x0b0f
#define LEN_UD2 2
/*
* In clang we have UD1s reporting UBSAN failures on X86, 64 and 32bit.
*/
#define INSN_ASOP 0x67
#define OPCODE_ESCAPE 0x0f
#define SECOND_BYTE_OPCODE_UD1 0xb9
#define SECOND_BYTE_OPCODE_UD2 0x0b
#define BUG_NONE 0xffff
#define BUG_UD1 0xfffe
#define BUG_UD2 0xfffd
#ifdef CONFIG_GENERIC_BUG
#ifdef CONFIG_X86_32
# define __BUG_REL(val) ".long " __stringify(val)
#else
# define __BUG_REL(val) ".long " __stringify(val) " - ."
#endif
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define _BUG_FLAGS(ins, flags, extra) \
do { \
asm_inline volatile("1:\t" ins "\n" \
".pushsection __bug_table,\"aw\"\n" \
"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \
"\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \
"\t.word %c1" "\t# bug_entry::line\n" \
"\t.word %c2" "\t# bug_entry::flags\n" \
"\t.org 2b+%c3\n" \
".popsection\n" \
extra \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (flags), \
"i" (sizeof(struct bug_entry))); \
} while (0)
#else /* !CONFIG_DEBUG_BUGVERBOSE */
#define _BUG_FLAGS(ins, flags, extra) \
do { \
asm_inline volatile("1:\t" ins "\n" \
".pushsection __bug_table,\"aw\"\n" \
"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \
"\t.word %c0" "\t# bug_entry::flags\n" \
"\t.org 2b+%c1\n" \
".popsection\n" \
extra \
: : "i" (flags), \
"i" (sizeof(struct bug_entry))); \
} while (0)
#endif /* CONFIG_DEBUG_BUGVERBOSE */
#else
#define _BUG_FLAGS(ins, flags, extra) asm volatile(ins)
#endif /* CONFIG_GENERIC_BUG */
#define HAVE_ARCH_BUG
#define BUG() \
do { \
instrumentation_begin(); \
_BUG_FLAGS(ASM_UD2, 0, ""); \
__builtin_unreachable(); \
} while (0)
/*
* This instrumentation_begin() is strictly speaking incorrect; but it
* suppresses the complaints from WARN()s in noinstr code. If such a WARN()
* were to trigger, we'd rather wreck the machine in an attempt to get the
* message out than not know about it.
*/
#define __WARN_FLAGS(flags) \
do { \
__auto_type __flags = BUGFLAG_WARNING|(flags); \
instrumentation_begin(); \
_BUG_FLAGS(ASM_UD2, __flags, ASM_REACHABLE); \
instrumentation_end(); \
} while (0)
#include <asm-generic/bug.h>
#endif /* _ASM_X86_BUG_H */
|
