Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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/* Types and messages used for dynamically added kdb shell commands */
32
33#define KDB_MAXARGS 16 /* Maximum number of arguments to a function */
34
35typedef enum {
36 KDB_REPEAT_NONE = 0, /* Do not repeat this command */
37 KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */
38 KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */
39} kdb_repeat_t;
40
41typedef int (*kdb_func_t)(int, const char **);
42
43/* KDB return codes from a command or internal kdb function */
44#define KDB_NOTFOUND (-1)
45#define KDB_ARGCOUNT (-2)
46#define KDB_BADWIDTH (-3)
47#define KDB_BADRADIX (-4)
48#define KDB_NOTENV (-5)
49#define KDB_NOENVVALUE (-6)
50#define KDB_NOTIMP (-7)
51#define KDB_ENVFULL (-8)
52#define KDB_ENVBUFFULL (-9)
53#define KDB_TOOMANYBPT (-10)
54#define KDB_TOOMANYDBREGS (-11)
55#define KDB_DUPBPT (-12)
56#define KDB_BPTNOTFOUND (-13)
57#define KDB_BADMODE (-14)
58#define KDB_BADINT (-15)
59#define KDB_INVADDRFMT (-16)
60#define KDB_BADREG (-17)
61#define KDB_BADCPUNUM (-18)
62#define KDB_BADLENGTH (-19)
63#define KDB_NOBP (-20)
64#define KDB_BADADDR (-21)
65
66/*
67 * kdb_diemsg
68 *
69 * Contains a pointer to the last string supplied to the
70 * kernel 'die' panic function.
71 */
72extern const char *kdb_diemsg;
73
74#define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */
75#define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */
76#define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */
77#define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */
78#define KDB_FLAG_ONLY_DO_DUMP (1 << 4) /* Only do a dump, used when
79 * kdb is off */
80#define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available,
81 * kdb is disabled */
82#define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do
83 * not use keyboard */
84#define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do
85 * not use keyboard */
86
87extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */
88
89extern void kdb_save_flags(void);
90extern void kdb_restore_flags(void);
91
92#define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag)
93#define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag))
94#define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag))
95
96/*
97 * External entry point for the kernel debugger. The pt_regs
98 * at the time of entry are supplied along with the reason for
99 * entry to the kernel debugger.
100 */
101
102typedef enum {
103 KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */
104 KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
105 KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */
106 KDB_REASON_DEBUG, /* Debug Fault - regs valid */
107 KDB_REASON_OOPS, /* Kernel Oops - regs valid */
108 KDB_REASON_SWITCH, /* CPU switch - regs valid*/
109 KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */
110 KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */
111 KDB_REASON_RECURSE, /* Recursive entry to kdb;
112 * regs probably valid */
113 KDB_REASON_SSTEP, /* Single Step trap. - regs valid */
114} kdb_reason_t;
115
116extern int kdb_trap_printk;
117extern int vkdb_printf(const char *fmt, va_list args)
118 __attribute__ ((format (printf, 1, 0)));
119extern int kdb_printf(const char *, ...)
120 __attribute__ ((format (printf, 1, 2)));
121typedef int (*kdb_printf_t)(const char *, ...)
122 __attribute__ ((format (printf, 1, 2)));
123
124extern void kdb_init(int level);
125
126/* Access to kdb specific polling devices */
127typedef int (*get_char_func)(void);
128extern get_char_func kdb_poll_funcs[];
129extern int kdb_get_kbd_char(void);
130
131static inline
132int kdb_process_cpu(const struct task_struct *p)
133{
134 unsigned int cpu = task_thread_info(p)->cpu;
135 if (cpu > num_possible_cpus())
136 cpu = 0;
137 return cpu;
138}
139
140/* kdb access to register set for stack dumping */
141extern struct pt_regs *kdb_current_regs;
142#ifdef CONFIG_KALLSYMS
143extern const char *kdb_walk_kallsyms(loff_t *pos);
144#else /* ! CONFIG_KALLSYMS */
145static inline const char *kdb_walk_kallsyms(loff_t *pos)
146{
147 return NULL;
148}
149#endif /* ! CONFIG_KALLSYMS */
150
151/* Dynamic kdb shell command registration */
152extern int kdb_register(char *, kdb_func_t, char *, char *, short);
153extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
154 short, kdb_repeat_t);
155extern int kdb_unregister(char *);
156#else /* ! CONFIG_KGDB_KDB */
157#define kdb_printf(...)
158#define kdb_init(x)
159#define kdb_register(...)
160#define kdb_register_repeat(...)
161#define kdb_uregister(x)
162#endif /* CONFIG_KGDB_KDB */
163enum {
164 KDB_NOT_INITIALIZED,
165 KDB_INIT_EARLY,
166 KDB_INIT_FULL,
167};
168
169extern int kdbgetintenv(const char *, int *);
170extern int kdb_set(int, const char **);
171
172#endif /* !_KDB_H */