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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 PZ |
7 | /* |
8 | * Since some emulators terminate on UD2, we cannot use it for WARN. | |
9 | * Since various instruction decoders disagree on the length of UD1, | |
10 | * we cannot use it either. So use UD0 for WARN. | |
11 | * | |
12 | * (binutils knows about "ud1" but {en,de}codes it as 2 bytes, whereas | |
13 | * our kernel decoder thinks it takes a ModRM byte, which seems consistent | |
14 | * with various things like the Intel SDM instruction encoding rules) | |
15 | */ | |
16 | ||
17 | #define ASM_UD0 ".byte 0x0f, 0xff" | |
18 | #define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */ | |
19 | #define ASM_UD2 ".byte 0x0f, 0x0b" | |
20 | ||
21 | #define INSN_UD0 0xff0f | |
22 | #define INSN_UD2 0x0b0f | |
23 | ||
24 | #define LEN_UD0 2 | |
25 | ||
26 | #ifdef CONFIG_GENERIC_BUG | |
68fdc55c | 27 | |
96a388de | 28 | #ifdef CONFIG_X86_32 |
9a93848f | 29 | # define __BUG_REL(val) ".long " __stringify(val) |
96a388de | 30 | #else |
9a93848f | 31 | # define __BUG_REL(val) ".long " __stringify(val) " - 2b" |
68fdc55c TG |
32 | #endif |
33 | ||
9a93848f PZ |
34 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
35 | ||
36 | #define _BUG_FLAGS(ins, flags) \ | |
37 | do { \ | |
38 | asm volatile("1:\t" ins "\n" \ | |
325cdacd | 39 | ".pushsection __bug_table,\"aw\"\n" \ |
9a93848f PZ |
40 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
41 | "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \ | |
42 | "\t.word %c1" "\t# bug_entry::line\n" \ | |
43 | "\t.word %c2" "\t# bug_entry::flags\n" \ | |
44 | "\t.org 2b+%c3\n" \ | |
45 | ".popsection" \ | |
46 | : : "i" (__FILE__), "i" (__LINE__), \ | |
47 | "i" (flags), \ | |
48 | "i" (sizeof(struct bug_entry))); \ | |
86d8a086 | 49 | } while (0) |
68fdc55c | 50 | |
9a93848f PZ |
51 | #else /* !CONFIG_DEBUG_BUGVERBOSE */ |
52 | ||
53 | #define _BUG_FLAGS(ins, flags) \ | |
54 | do { \ | |
55 | asm volatile("1:\t" ins "\n" \ | |
325cdacd | 56 | ".pushsection __bug_table,\"aw\"\n" \ |
9a93848f PZ |
57 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
58 | "\t.word %c0" "\t# bug_entry::flags\n" \ | |
59 | "\t.org 2b+%c1\n" \ | |
60 | ".popsection" \ | |
61 | : : "i" (flags), \ | |
62 | "i" (sizeof(struct bug_entry))); \ | |
63 | } while (0) | |
64 | ||
65 | #endif /* CONFIG_DEBUG_BUGVERBOSE */ | |
66 | ||
70579a86 AB |
67 | #else |
68 | ||
69 | #define _BUG_FLAGS(ins, flags) asm volatile(ins) | |
70 | ||
71 | #endif /* CONFIG_GENERIC_BUG */ | |
72 | ||
73 | #define HAVE_ARCH_BUG | |
86d8a086 JP |
74 | #define BUG() \ |
75 | do { \ | |
9a93848f | 76 | _BUG_FLAGS(ASM_UD2, 0); \ |
a5fc5eba | 77 | unreachable(); \ |
86d8a086 | 78 | } while (0) |
9a93848f | 79 | |
19d43626 | 80 | #define __WARN_FLAGS(flags) _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags)) |
9a93848f | 81 | |
68fdc55c | 82 | #include <asm-generic/bug.h> |
f05e798a | 83 | |
1965aae3 | 84 | #endif /* _ASM_X86_BUG_H */ |