Merge tag 'pm-4.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
[linux/fpc-iii.git] / arch / x86 / include / asm / bug.h
blobaa6b2023d8f8bc104e0b30a086a4c981ed47abb1
1 #ifndef _ASM_X86_BUG_H
2 #define _ASM_X86_BUG_H
4 #include <linux/stringify.h>
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.
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)
16 #define ASM_UD0 ".byte 0x0f, 0xff"
17 #define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */
18 #define ASM_UD2 ".byte 0x0f, 0x0b"
20 #define INSN_UD0 0xff0f
21 #define INSN_UD2 0x0b0f
23 #define LEN_UD0 2
25 #ifdef CONFIG_GENERIC_BUG
27 #ifdef CONFIG_X86_32
28 # define __BUG_REL(val) ".long " __stringify(val)
29 #else
30 # define __BUG_REL(val) ".long " __stringify(val) " - 2b"
31 #endif
33 #ifdef CONFIG_DEBUG_BUGVERBOSE
35 #define _BUG_FLAGS(ins, flags) \
36 do { \
37 asm volatile("1:\t" ins "\n" \
38 ".pushsection __bug_table,\"aw\"\n" \
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))); \
48 } while (0)
50 #else /* !CONFIG_DEBUG_BUGVERBOSE */
52 #define _BUG_FLAGS(ins, flags) \
53 do { \
54 asm volatile("1:\t" ins "\n" \
55 ".pushsection __bug_table,\"aw\"\n" \
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)
64 #endif /* CONFIG_DEBUG_BUGVERBOSE */
66 #else
68 #define _BUG_FLAGS(ins, flags) asm volatile(ins)
70 #endif /* CONFIG_GENERIC_BUG */
72 #define HAVE_ARCH_BUG
73 #define BUG() \
74 do { \
75 _BUG_FLAGS(ASM_UD2, 0); \
76 unreachable(); \
77 } while (0)
79 #define __WARN_FLAGS(flags) _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags))
81 #include <asm-generic/bug.h>
83 #endif /* _ASM_X86_BUG_H */