| | 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 | #include <linux/instrumentation.h> |
| | 7 | #include <linux/objtool.h> |
| | 8 | |
| | 9 | /* |
| | 10 | * Despite that some emulators terminate on UD2, we use it for WARN(). |
| | 11 | */ |
| | 12 | #define ASM_UD2 ".byte 0x0f, 0x0b" |
| | 13 | #define INSN_UD2 0x0b0f |
| | 14 | #define LEN_UD2 2 |
| | 15 | |
| | 16 | /* |
| | 17 | * In clang we have UD1s reporting UBSAN failures on X86, 64 and 32bit. |
| | 18 | */ |
| | 19 | #define INSN_ASOP 0x67 |
| | 20 | #define INSN_LOCK 0xf0 |
| | 21 | #define OPCODE_ESCAPE 0x0f |
| | 22 | #define SECOND_BYTE_OPCODE_UD1 0xb9 |
| | 23 | #define SECOND_BYTE_OPCODE_UD2 0x0b |
| | 24 | |
| | 25 | #define BUG_NONE 0xffff |
| | 26 | #define BUG_UD2 0xfffe |
| | 27 | #define BUG_UD1 0xfffd |
| | 28 | #define BUG_UD1_UBSAN 0xfffc |
| | 29 | #define BUG_EA 0xffea |
| | 30 | #define BUG_LOCK 0xfff0 |
| | 31 | |
| | 32 | #ifdef CONFIG_GENERIC_BUG |
| | 33 | |
| | 34 | #ifdef CONFIG_X86_32 |
| | 35 | # define __BUG_REL(val) ".long " __stringify(val) |
| | 36 | #else |
| | 37 | # define __BUG_REL(val) ".long " __stringify(val) " - ." |
| | 38 | #endif |
| | 39 | |
| | 40 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
| | 41 | |
| | 42 | #define _BUG_FLAGS(ins, flags, extra) \ |
| | 43 | do { \ |
| | 44 | asm_inline volatile("1:\t" ins "\n" \ |
| | 45 | ".pushsection __bug_table,\"aw\"\n" \ |
| | 46 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
| | 47 | "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \ |
| | 48 | "\t.word %c1" "\t# bug_entry::line\n" \ |
| | 49 | "\t.word %c2" "\t# bug_entry::flags\n" \ |
| | 50 | "\t.org 2b+%c3\n" \ |
| | 51 | ".popsection\n" \ |
| | 52 | extra \ |
| | 53 | : : "i" (__FILE__), "i" (__LINE__), \ |
| | 54 | "i" (flags), \ |
| | 55 | "i" (sizeof(struct bug_entry))); \ |
| | 56 | } while (0) |
| | 57 | |
| | 58 | #else /* !CONFIG_DEBUG_BUGVERBOSE */ |
| | 59 | |
| | 60 | #define _BUG_FLAGS(ins, flags, extra) \ |
| | 61 | do { \ |
| | 62 | asm_inline volatile("1:\t" ins "\n" \ |
| | 63 | ".pushsection __bug_table,\"aw\"\n" \ |
| | 64 | "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
| | 65 | "\t.word %c0" "\t# bug_entry::flags\n" \ |
| | 66 | "\t.org 2b+%c1\n" \ |
| | 67 | ".popsection\n" \ |
| | 68 | extra \ |
| | 69 | : : "i" (flags), \ |
| | 70 | "i" (sizeof(struct bug_entry))); \ |
| | 71 | } while (0) |
| | 72 | |
| | 73 | #endif /* CONFIG_DEBUG_BUGVERBOSE */ |
| | 74 | |
| | 75 | #else |
| | 76 | |
| | 77 | #define _BUG_FLAGS(ins, flags, extra) asm volatile(ins) |
| | 78 | |
| | 79 | #endif /* CONFIG_GENERIC_BUG */ |
| | 80 | |
| | 81 | #define HAVE_ARCH_BUG |
| | 82 | #define BUG() \ |
| | 83 | do { \ |
| | 84 | instrumentation_begin(); \ |
| | 85 | _BUG_FLAGS(ASM_UD2, 0, ""); \ |
| | 86 | __builtin_unreachable(); \ |
| | 87 | } while (0) |
| | 88 | |
| | 89 | /* |
| | 90 | * This instrumentation_begin() is strictly speaking incorrect; but it |
| | 91 | * suppresses the complaints from WARN()s in noinstr code. If such a WARN() |
| | 92 | * were to trigger, we'd rather wreck the machine in an attempt to get the |
| | 93 | * message out than not know about it. |
| | 94 | */ |
| | 95 | #define __WARN_FLAGS(flags) \ |
| | 96 | do { \ |
| | 97 | __auto_type __flags = BUGFLAG_WARNING|(flags); \ |
| | 98 | instrumentation_begin(); \ |
| | 99 | _BUG_FLAGS(ASM_UD2, __flags, ANNOTATE_REACHABLE(1b)); \ |
| | 100 | instrumentation_end(); \ |
| | 101 | } while (0) |
| | 102 | |
| | 103 | #include <asm-generic/bug.h> |
| | 104 | |
| | 105 | #endif /* _ASM_X86_BUG_H */ |
projects / linux-2.6-block.git / blame_incremental