Linux kernel mirror (for testing)
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linux
1#ifndef _ASMARM_BUG_H
2#define _ASMARM_BUG_H
3
4#include <linux/linkage.h>
5#include <linux/types.h>
6#include <asm/opcodes.h>
7
8#ifdef CONFIG_BUG
9
10/*
11 * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
12 * We need to be careful not to conflict with those used by other modules and
13 * the register_undef_hook() system.
14 */
15#ifdef CONFIG_THUMB2_KERNEL
16#define BUG_INSTR_VALUE 0xde02
17#define BUG_INSTR(__value) __inst_thumb16(__value)
18#else
19#define BUG_INSTR_VALUE 0xe7f001f2
20#define BUG_INSTR(__value) __inst_arm(__value)
21#endif
22
23
24#define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
25#define _BUG(file, line, value) __BUG(file, line, value)
26
27#ifdef CONFIG_DEBUG_BUGVERBOSE
28
29/*
30 * The extra indirection is to ensure that the __FILE__ string comes through
31 * OK. Many version of gcc do not support the asm %c parameter which would be
32 * preferable to this unpleasantness. We use mergeable string sections to
33 * avoid multiple copies of the string appearing in the kernel image.
34 */
35
36#define __BUG(__file, __line, __value) \
37do { \
38 asm volatile("1:\t" BUG_INSTR(__value) "\n" \
39 ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
40 "2:\t.asciz " #__file "\n" \
41 ".popsection\n" \
42 ".pushsection __bug_table,\"a\"\n" \
43 ".align 2\n" \
44 "3:\t.word 1b, 2b\n" \
45 "\t.hword " #__line ", 0\n" \
46 ".popsection"); \
47 unreachable(); \
48} while (0)
49
50#else /* not CONFIG_DEBUG_BUGVERBOSE */
51
52#define __BUG(__file, __line, __value) \
53do { \
54 asm volatile(BUG_INSTR(__value) "\n"); \
55 unreachable(); \
56} while (0)
57#endif /* CONFIG_DEBUG_BUGVERBOSE */
58
59#define HAVE_ARCH_BUG
60#endif /* CONFIG_BUG */
61
62#include <asm-generic/bug.h>
63
64struct pt_regs;
65void die(const char *msg, struct pt_regs *regs, int err);
66
67struct siginfo;
68void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
69 unsigned long err, unsigned long trap);
70
71#ifdef CONFIG_ARM_LPAE
72#define FAULT_CODE_ALIGNMENT 33
73#define FAULT_CODE_DEBUG 34
74#else
75#define FAULT_CODE_ALIGNMENT 1
76#define FAULT_CODE_DEBUG 2
77#endif
78
79void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
80 struct pt_regs *),
81 int sig, int code, const char *name);
82
83void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
84 struct pt_regs *),
85 int sig, int code, const char *name);
86
87extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
88
89struct mm_struct;
90extern void show_pte(struct mm_struct *mm, unsigned long addr);
91extern void __show_regs(struct pt_regs *);
92
93#endif