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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 | typedef enum { |
17 | KDB_REPEAT_NONE = 0, /* Do not repeat this command */ |
18 | KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */ |
19 | KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */ |
20 | } kdb_repeat_t; |
21 | |
22 | typedef int (*kdb_func_t)(int, const char **); |
23 | |
24 | #ifdef CONFIG_KGDB_KDB |
25 | #include <linux/init.h> |
26 | #include <linux/sched.h> |
27 | #include <linux/atomic.h> |
28 | |
29 | #define KDB_POLL_FUNC_MAX 5 |
30 | extern int kdb_poll_idx; |
31 | |
32 | /* |
33 | * kdb_initial_cpu is initialized to -1, and is set to the cpu |
34 | * number whenever the kernel debugger is entered. |
35 | */ |
36 | extern int kdb_initial_cpu; |
37 | extern atomic_t kdb_event; |
38 | |
39 | /* Types and messages used for dynamically added kdb shell commands */ |
40 | |
41 | #define KDB_MAXARGS 16 /* Maximum number of arguments to a function */ |
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 | */ |
72 | extern 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_NO_CONSOLE (1 << 5) /* No console is available, |
79 | * kdb is disabled */ |
80 | #define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do |
81 | * not use keyboard */ |
82 | #define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do |
83 | * not use keyboard */ |
84 | |
85 | extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */ |
86 | |
87 | extern void kdb_save_flags(void); |
88 | extern void kdb_restore_flags(void); |
89 | |
90 | #define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag) |
91 | #define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag)) |
92 | #define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag)) |
93 | |
94 | /* |
95 | * External entry point for the kernel debugger. The pt_regs |
96 | * at the time of entry are supplied along with the reason for |
97 | * entry to the kernel debugger. |
98 | */ |
99 | |
100 | typedef enum { |
101 | KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */ |
102 | KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */ |
103 | KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */ |
104 | KDB_REASON_DEBUG, /* Debug Fault - regs valid */ |
105 | KDB_REASON_OOPS, /* Kernel Oops - regs valid */ |
106 | KDB_REASON_SWITCH, /* CPU switch - regs valid*/ |
107 | KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */ |
108 | KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */ |
109 | KDB_REASON_RECURSE, /* Recursive entry to kdb; |
110 | * regs probably valid */ |
111 | KDB_REASON_SSTEP, /* Single Step trap. - regs valid */ |
112 | } kdb_reason_t; |
113 | |
114 | extern int kdb_trap_printk; |
115 | extern __printf(1, 0) int vkdb_printf(const char *fmt, va_list args); |
116 | extern __printf(1, 2) int kdb_printf(const char *, ...); |
117 | typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...); |
118 | |
119 | extern void kdb_init(int level); |
120 | |
121 | /* Access to kdb specific polling devices */ |
122 | typedef int (*get_char_func)(void); |
123 | extern get_char_func kdb_poll_funcs[]; |
124 | extern int kdb_get_kbd_char(void); |
125 | |
126 | static inline |
127 | int kdb_process_cpu(const struct task_struct *p) |
128 | { |
129 | unsigned int cpu = task_thread_info(p)->cpu; |
130 | if (cpu > num_possible_cpus()) |
131 | cpu = 0; |
132 | return cpu; |
133 | } |
134 | |
135 | /* kdb access to register set for stack dumping */ |
136 | extern struct pt_regs *kdb_current_regs; |
137 | #ifdef CONFIG_KALLSYMS |
138 | extern const char *kdb_walk_kallsyms(loff_t *pos); |
139 | #else /* ! CONFIG_KALLSYMS */ |
140 | static inline const char *kdb_walk_kallsyms(loff_t *pos) |
141 | { |
142 | return NULL; |
143 | } |
144 | #endif /* ! CONFIG_KALLSYMS */ |
145 | |
146 | /* Dynamic kdb shell command registration */ |
147 | extern int kdb_register(char *, kdb_func_t, char *, char *, short); |
148 | extern int kdb_register_repeat(char *, kdb_func_t, char *, char *, |
149 | short, kdb_repeat_t); |
150 | extern int kdb_unregister(char *); |
151 | #else /* ! CONFIG_KGDB_KDB */ |
152 | static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; } |
153 | static inline void kdb_init(int level) {} |
154 | static inline int kdb_register(char *cmd, kdb_func_t func, char *usage, |
155 | char *help, short minlen) { return 0; } |
156 | static inline int kdb_register_repeat(char *cmd, kdb_func_t func, char *usage, |
157 | char *help, short minlen, |
158 | kdb_repeat_t repeat) { return 0; } |
159 | static inline int kdb_unregister(char *cmd) { return 0; } |
160 | #endif /* CONFIG_KGDB_KDB */ |
161 | enum { |
162 | KDB_NOT_INITIALIZED, |
163 | KDB_INIT_EARLY, |
164 | KDB_INIT_FULL, |
165 | }; |
166 | |
167 | extern int kdbgetintenv(const char *, int *); |
168 | extern int kdb_set(int, const char **); |
169 | |
170 | #endif /* !_KDB_H */ |
171 |
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