projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| 26 | #define HAVE_ARCH_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" \ | |
| 39 | ".pushsection __bug_table,\"a\"\n" \ | |
| 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" \ | |
| 56 | ".pushsection __bug_table,\"a\"\n" \ | |
| 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 | ||
| 86d8a086 JP |
67 | #define BUG() \ |
| 68 | do { \ | |
| 9a93848f | 69 | _BUG_FLAGS(ASM_UD2, 0); \ |
| a5fc5eba | 70 | unreachable(); \ |
| 86d8a086 | 71 | } while (0) |
| 9a93848f PZ |
72 | |
| 73 | #define __WARN_TAINT(taint) _BUG_FLAGS(ASM_UD0, BUGFLAG_TAINT(taint)) | |
| 74 | ||
| 75 | #endif /* CONFIG_GENERIC_BUG */ | |
| 68fdc55c | 76 | |
| 68fdc55c | 77 | #include <asm-generic/bug.h> |
| f05e798a | 78 | |
| 1965aae3 | 79 | #endif /* _ASM_X86_BUG_H */ |