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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_BUG_H |
3 | #define _ASM_X86_BUG_H | |
68fdc55c | 4 | |
9a93848f | 5 | #include <linux/stringify.h> |
68fdc55c | 6 | |
9a93848f | 7 | /* |
f5b10c36 | 8 | * Despite that some emulators terminate on UD2, we use it for WARN(). |
9a93848f | 9 | * |
f5b10c36 PZ |
10 | * Since various instruction decoders/specs disagree on the encoding of |
11 | * UD0/UD1. | |
9a93848f PZ |
12 | */ |
13 | ||
f5b10c36 | 14 | #define ASM_UD0 ".byte 0x0f, 0xff" /* + ModRM (for Intel) */ |
9a93848f PZ |
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 | ||
f5b10c36 | 21 | #define LEN_UD2 2 |
9a93848f PZ |
22 | |
23 | #ifdef CONFIG_GENERIC_BUG | |
68fdc55c | 24 | |
96a388de | 25 | #ifdef CONFIG_X86_32 |
9a93848f | 26 | # define __BUG_REL(val) ".long " __stringify(val) |
96a388de | 27 | #else |
9a93848f | 28 | # define __BUG_REL(val) ".long " __stringify(val) " - 2b" |
68fdc55c TG |
29 | #endif |
30 | ||
9a93848f PZ |
31 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
32 | ||
33 | #define _BUG_FLAGS(ins, flags) \ | |
34 | do { \ | |
35 | asm volatile("1:\t" ins "\n" \ | |
325cdacd | 36 | ".pushsection __bug_table,\"aw\"\n" \ |
9a93848f PZ |
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))); \ | |
86d8a086 | 46 | } while (0) |
68fdc55c | 47 | |
9a93848f PZ |
48 | #else /* !CONFIG_DEBUG_BUGVERBOSE */ |
49 | ||
50 | #define _BUG_FLAGS(ins, flags) \ | |
51 | do { \ | |
52 | asm volatile("1:\t" ins "\n" \ | |
325cdacd | 53 | ".pushsection __bug_table,\"aw\"\n" \ |
9a93848f PZ |
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 | ||
70579a86 AB |
64 | #else |
65 | ||
66 | #define _BUG_FLAGS(ins, flags) asm volatile(ins) | |
67 | ||
68 | #endif /* CONFIG_GENERIC_BUG */ | |
69 | ||
70 | #define HAVE_ARCH_BUG | |
86d8a086 JP |
71 | #define BUG() \ |
72 | do { \ | |
9a93848f | 73 | _BUG_FLAGS(ASM_UD2, 0); \ |
a5fc5eba | 74 | unreachable(); \ |
86d8a086 | 75 | } while (0) |
9a93848f | 76 | |
80e59c1d JP |
77 | #define __WARN_FLAGS(flags) \ |
78 | do { \ | |
f5b10c36 | 79 | _BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags)); \ |
80e59c1d JP |
80 | annotate_reachable(); \ |
81 | } while (0) | |
9a93848f | 82 | |
68fdc55c | 83 | #include <asm-generic/bug.h> |
f05e798a | 84 | |
1965aae3 | 85 | #endif /* _ASM_X86_BUG_H */ |