Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / arm / include / asm / bug.h
blob9abe7a07d5acdde3eea377cda3634e5f5c838115
1 #ifndef _ASMARM_BUG_H
2 #define _ASMARM_BUG_H
5 #ifdef CONFIG_BUG
7 /*
8 * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
9 * We need to be careful not to conflict with those used by other modules and
10 * the register_undef_hook() system.
12 #ifdef CONFIG_THUMB2_KERNEL
13 #define BUG_INSTR_VALUE 0xde02
14 #define BUG_INSTR_TYPE ".hword "
15 #else
16 #define BUG_INSTR_VALUE 0xe7f001f2
17 #define BUG_INSTR_TYPE ".word "
18 #endif
21 #define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
22 #define _BUG(file, line, value) __BUG(file, line, value)
24 #ifdef CONFIG_DEBUG_BUGVERBOSE
27 * The extra indirection is to ensure that the __FILE__ string comes through
28 * OK. Many version of gcc do not support the asm %c parameter which would be
29 * preferable to this unpleasantness. We use mergeable string sections to
30 * avoid multiple copies of the string appearing in the kernel image.
33 #define __BUG(__file, __line, __value) \
34 do { \
35 BUILD_BUG_ON(sizeof(struct bug_entry) != 12); \
36 asm volatile("1:\t" BUG_INSTR_TYPE #__value "\n" \
37 ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
38 "2:\t.asciz " #__file "\n" \
39 ".popsection\n" \
40 ".pushsection __bug_table,\"a\"\n" \
41 "3:\t.word 1b, 2b\n" \
42 "\t.hword " #__line ", 0\n" \
43 ".popsection"); \
44 unreachable(); \
45 } while (0)
47 #else /* not CONFIG_DEBUG_BUGVERBOSE */
49 #define __BUG(__file, __line, __value) \
50 do { \
51 asm volatile(BUG_INSTR_TYPE #__value); \
52 unreachable(); \
53 } while (0)
54 #endif /* CONFIG_DEBUG_BUGVERBOSE */
56 #define HAVE_ARCH_BUG
57 #endif /* CONFIG_BUG */
59 #include <asm-generic/bug.h>
61 #endif