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Commit | Line | Data |
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1965aae3 PA |
1 | #ifndef _ASM_X86_BUG_H |
2 | #define _ASM_X86_BUG_H | |
68fdc55c | 3 | |
9a93848f | 4 | #include <linux/stringify.h> |
68fdc55c | 5 | |
9a93848f PZ |
6 | /* |
7 | * Since some emulators terminate on UD2, we cannot use it for WARN. | |
8 | * Since various instruction decoders disagree on the length of UD1, | |
9 | * we cannot use it either. So use UD0 for WARN. | |
10 | * | |
11 | * (binutils knows about "ud1" but {en,de}codes it as 2 bytes, whereas | |
12 | * our kernel decoder thinks it takes a ModRM byte, which seems consistent | |
13 | * with various things like the Intel SDM instruction encoding rules) | |
14 | */ | |
15 | ||
16 | #define ASM_UD0 ".byte 0x0f, 0xff" | |
17 | #define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */ | |
18 | #define ASM_UD2 ".byte 0x0f, 0x0b" | |
19 | ||
20 | #define INSN_UD0 0xff0f | |
21 | #define INSN_UD2 0x0b0f | |
22 | ||
23 | #define LEN_UD0 2 | |
24 | ||
25 | #ifdef CONFIG_GENERIC_BUG | |
68fdc55c | 26 | |
96a388de | 27 | #ifdef CONFIG_X86_32 |
9a93848f | 28 | # define __BUG_REL(val) ".long " __stringify(val) |
96a388de | 29 | #else |
9a93848f | 30 | # define __BUG_REL(val) ".long " __stringify(val) " - 2b" |
68fdc55c TG |
31 | #endif |
32 | ||
9a93848f PZ |
33 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
34 | ||
35 | #define _BUG_FLAGS(ins, flags) \ | |
36 | do { \ | |
37 | asm volatile("1:\t" ins "\n" \ | |
325cdacd | 38 | ".pushsection __bug_table,\"aw\"\n" \ |
9a93848f PZ |
39 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
40 | "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \ | |
41 | "\t.word %c1" "\t# bug_entry::line\n" \ | |
42 | "\t.word %c2" "\t# bug_entry::flags\n" \ | |
43 | "\t.org 2b+%c3\n" \ | |
44 | ".popsection" \ | |
45 | : : "i" (__FILE__), "i" (__LINE__), \ | |
46 | "i" (flags), \ | |
47 | "i" (sizeof(struct bug_entry))); \ | |
86d8a086 | 48 | } while (0) |
68fdc55c | 49 | |
9a93848f PZ |
50 | #else /* !CONFIG_DEBUG_BUGVERBOSE */ |
51 | ||
52 | #define _BUG_FLAGS(ins, flags) \ | |
53 | do { \ | |
54 | asm volatile("1:\t" ins "\n" \ | |
325cdacd | 55 | ".pushsection __bug_table,\"aw\"\n" \ |
9a93848f PZ |
56 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
57 | "\t.word %c0" "\t# bug_entry::flags\n" \ | |
58 | "\t.org 2b+%c1\n" \ | |
59 | ".popsection" \ | |
60 | : : "i" (flags), \ | |
61 | "i" (sizeof(struct bug_entry))); \ | |
62 | } while (0) | |
63 | ||
64 | #endif /* CONFIG_DEBUG_BUGVERBOSE */ | |
65 | ||
70579a86 AB |
66 | #else |
67 | ||
68 | #define _BUG_FLAGS(ins, flags) asm volatile(ins) | |
69 | ||
70 | #endif /* CONFIG_GENERIC_BUG */ | |
71 | ||
72 | #define HAVE_ARCH_BUG | |
86d8a086 JP |
73 | #define BUG() \ |
74 | do { \ | |
9a93848f | 75 | _BUG_FLAGS(ASM_UD2, 0); \ |
a5fc5eba | 76 | unreachable(); \ |
86d8a086 | 77 | } while (0) |
9a93848f | 78 | |
19d43626 | 79 | #define __WARN_FLAGS(flags) _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags)) |
9a93848f | 80 | |
68fdc55c | 81 | #include <asm-generic/bug.h> |
f05e798a | 82 | |
1965aae3 | 83 | #endif /* _ASM_X86_BUG_H */ |