Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _ASMARM_BUG_H
2#define _ASMARM_BUG_H
3
4
5#ifdef CONFIG_BUG
6
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.
11 */
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
19
20
21#define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
22#define _BUG(file, line, value) __BUG(file, line, value)
23
24#ifdef CONFIG_DEBUG_BUGVERBOSE
25
26/*
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.
31 */
32
33#define __BUG(__file, __line, __value) \
34do { \
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)
46
47#else /* not CONFIG_DEBUG_BUGVERBOSE */
48
49#define __BUG(__file, __line, __value) \
50do { \
51 asm volatile(BUG_INSTR_TYPE #__value); \
52 unreachable(); \
53} while (0)
54#endif /* CONFIG_DEBUG_BUGVERBOSE */
55
56#define HAVE_ARCH_BUG
57#endif /* CONFIG_BUG */
58
59#include <asm-generic/bug.h>
60
61#endif