Linux kernel mirror (for testing)
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linux
1#ifndef _KDB_H
2#define _KDB_H
3
4/*
5 * Kernel Debugger Architecture Independent Global Headers
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 *
11 * Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
12 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
13 * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
14 */
15
16#ifdef CONFIG_KGDB_KDB
17#include <linux/init.h>
18#include <linux/sched.h>
19#include <asm/atomic.h>
20
21#define KDB_POLL_FUNC_MAX 5
22extern int kdb_poll_idx;
23
24/*
25 * kdb_initial_cpu is initialized to -1, and is set to the cpu
26 * number whenever the kernel debugger is entered.
27 */
28extern int kdb_initial_cpu;
29extern atomic_t kdb_event;
30
31/*
32 * kdb_diemsg
33 *
34 * Contains a pointer to the last string supplied to the
35 * kernel 'die' panic function.
36 */
37extern const char *kdb_diemsg;
38
39#define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */
40#define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */
41#define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */
42#define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */
43#define KDB_FLAG_ONLY_DO_DUMP (1 << 4) /* Only do a dump, used when
44 * kdb is off */
45#define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available,
46 * kdb is disabled */
47#define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do
48 * not use keyboard */
49#define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do
50 * not use keyboard */
51
52extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */
53
54extern void kdb_save_flags(void);
55extern void kdb_restore_flags(void);
56
57#define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag)
58#define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag))
59#define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag))
60
61/*
62 * External entry point for the kernel debugger. The pt_regs
63 * at the time of entry are supplied along with the reason for
64 * entry to the kernel debugger.
65 */
66
67typedef enum {
68 KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */
69 KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
70 KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */
71 KDB_REASON_DEBUG, /* Debug Fault - regs valid */
72 KDB_REASON_OOPS, /* Kernel Oops - regs valid */
73 KDB_REASON_SWITCH, /* CPU switch - regs valid*/
74 KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */
75 KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */
76 KDB_REASON_RECURSE, /* Recursive entry to kdb;
77 * regs probably valid */
78 KDB_REASON_SSTEP, /* Single Step trap. - regs valid */
79} kdb_reason_t;
80
81extern int kdb_trap_printk;
82extern int vkdb_printf(const char *fmt, va_list args)
83 __attribute__ ((format (printf, 1, 0)));
84extern int kdb_printf(const char *, ...)
85 __attribute__ ((format (printf, 1, 2)));
86typedef int (*kdb_printf_t)(const char *, ...)
87 __attribute__ ((format (printf, 1, 2)));
88
89extern void kdb_init(int level);
90
91/* Access to kdb specific polling devices */
92typedef int (*get_char_func)(void);
93extern get_char_func kdb_poll_funcs[];
94extern int kdb_get_kbd_char(void);
95
96static inline
97int kdb_process_cpu(const struct task_struct *p)
98{
99 unsigned int cpu = task_thread_info(p)->cpu;
100 if (cpu > num_possible_cpus())
101 cpu = 0;
102 return cpu;
103}
104
105/* kdb access to register set for stack dumping */
106extern struct pt_regs *kdb_current_regs;
107
108#else /* ! CONFIG_KGDB_KDB */
109#define kdb_printf(...)
110#define kdb_init(x)
111#endif /* CONFIG_KGDB_KDB */
112enum {
113 KDB_NOT_INITIALIZED,
114 KDB_INIT_EARLY,
115 KDB_INIT_FULL,
116};
117#endif /* !_KDB_H */