1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASMARM_BUG_H
3 #define _ASMARM_BUG_H
4
5 #include <linux/linkage.h>
6 #include <linux/types.h>
7 #include <asm/opcodes.h>
8
9 /*
10 * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
11 * We need to be careful not to conflict with those used by other modules and
12 * the register_undef_hook() system.
13 */
14 #ifdef CONFIG_THUMB2_KERNEL
15 #define BUG_INSTR_VALUE 0xde02
16 #define BUG_INSTR(__value) __inst_thumb16(__value)
17 #else
18 #define BUG_INSTR_VALUE 0xe7f001f2
19 #define BUG_INSTR(__value) __inst_arm(__value)
20 #endif
21
22
23 #define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
24 #define _BUG(file, line, value) __BUG(file, line, value)
25
26 #ifdef CONFIG_DEBUG_BUGVERBOSE
27
28 /*
29 * The extra indirection is to ensure that the __FILE__ string comes through
30 * OK. Many version of gcc do not support the asm %c parameter which would be
31 * preferable to this unpleasantness. We use mergeable string sections to
32 * avoid multiple copies of the string appearing in the kernel image.
33 */
34
35 #define __BUG(__file, __line, __value) \
36 do { \
37 asm volatile("1:\t" BUG_INSTR(__value) "\n" \
38 ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
39 "2:\t.asciz " #__file "\n" \
40 ".popsection\n" \
41 ".pushsection __bug_table,\"aw\"\n" \
42 ".align 2\n" \
43 "3:\t.word 1b, 2b\n" \
44 "\t.hword " #__line ", 0\n" \
45 ".popsection"); \
46 unreachable(); \
47 } while (0)
48
49 #else
50
51 #define __BUG(__file, __line, __value) \
52 do { \
53 asm volatile(BUG_INSTR(__value) "\n"); \
54 unreachable(); \
55 } while (0)
56 #endif /* CONFIG_DEBUG_BUGVERBOSE */
57
58 #define HAVE_ARCH_BUG
59
60 #include <asm-generic/bug.h>
61
62 struct pt_regs;
63 void die(const char *msg, struct pt_regs *regs, int err);
64
65 void arm_notify_die(const char *str, struct pt_regs *regs,
66 int signo, int si_code, void __user *addr,
67 unsigned long err, unsigned long trap);
68
69 #ifdef CONFIG_ARM_LPAE
70 #define FAULT_CODE_ALIGNMENT 33
71 #define FAULT_CODE_DEBUG 34
72 #else
73 #define FAULT_CODE_ALIGNMENT 1
74 #define FAULT_CODE_DEBUG 2
75 #endif
76
77 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
78 struct pt_regs *),
79 int sig, int code, const char *name);
80
81 void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
82 struct pt_regs *),
83 int sig, int code, const char *name);
84
85 extern asmlinkage void c_backtrace(unsigned long fp, int pmode,
86 const char *loglvl);
87
88 struct mm_struct;
89 void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr);
90 extern void __show_regs(struct pt_regs *);
91 extern void __show_regs_alloc_free(struct pt_regs *regs);
92
93 #endif
94
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.