1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _ASM_X86_BUG_H |
3 | #define _ASM_X86_BUG_H |
4 | |
5 | #include <linux/stringify.h> |
6 | |
7 | /* |
8 | * Despite that some emulators terminate on UD2, we use it for WARN(). |
9 | * |
10 | * Since various instruction decoders/specs disagree on the encoding of |
11 | * UD0/UD1. |
12 | */ |
13 | |
14 | #define ASM_UD0 ".byte 0x0f, 0xff" /* + ModRM (for Intel) */ |
15 | #define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */ |
16 | #define ASM_UD2 ".byte 0x0f, 0x0b" |
17 | |
18 | #define INSN_UD0 0xff0f |
19 | #define INSN_UD2 0x0b0f |
20 | |
21 | #define LEN_UD2 2 |
22 | |
23 | #ifdef CONFIG_GENERIC_BUG |
24 | |
25 | #ifdef CONFIG_X86_32 |
26 | # define __BUG_REL(val) ".long " __stringify(val) |
27 | #else |
28 | # define __BUG_REL(val) ".long " __stringify(val) " - 2b" |
29 | #endif |
30 | |
31 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
32 | |
33 | #define _BUG_FLAGS(ins, flags) \ |
34 | do { \ |
35 | asm volatile("1:\t" ins "\n" \ |
36 | ".pushsection __bug_table,\"aw\"\n" \ |
37 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
38 | "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \ |
39 | "\t.word %c1" "\t# bug_entry::line\n" \ |
40 | "\t.word %c2" "\t# bug_entry::flags\n" \ |
41 | "\t.org 2b+%c3\n" \ |
42 | ".popsection" \ |
43 | : : "i" (__FILE__), "i" (__LINE__), \ |
44 | "i" (flags), \ |
45 | "i" (sizeof(struct bug_entry))); \ |
46 | } while (0) |
47 | |
48 | #else /* !CONFIG_DEBUG_BUGVERBOSE */ |
49 | |
50 | #define _BUG_FLAGS(ins, flags) \ |
51 | do { \ |
52 | asm volatile("1:\t" ins "\n" \ |
53 | ".pushsection __bug_table,\"aw\"\n" \ |
54 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
55 | "\t.word %c0" "\t# bug_entry::flags\n" \ |
56 | "\t.org 2b+%c1\n" \ |
57 | ".popsection" \ |
58 | : : "i" (flags), \ |
59 | "i" (sizeof(struct bug_entry))); \ |
60 | } while (0) |
61 | |
62 | #endif /* CONFIG_DEBUG_BUGVERBOSE */ |
63 | |
64 | #else |
65 | |
66 | #define _BUG_FLAGS(ins, flags) asm volatile(ins) |
67 | |
68 | #endif /* CONFIG_GENERIC_BUG */ |
69 | |
70 | #define HAVE_ARCH_BUG |
71 | #define BUG() \ |
72 | do { \ |
73 | _BUG_FLAGS(ASM_UD2, 0); \ |
74 | unreachable(); \ |
75 | } while (0) |
76 | |
77 | #define __WARN_FLAGS(flags) \ |
78 | do { \ |
79 | _BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags)); \ |
80 | annotate_reachable(); \ |
81 | } while (0) |
82 | |
83 | #include <asm-generic/bug.h> |
84 | |
85 | #endif /* _ASM_X86_BUG_H */ |
86 | |