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