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5d5314d6 JW |
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 | ||
9452e977 DT |
16 | /* Shifted versions of the command enable bits are be used if the command |
17 | * has no arguments (see kdb_check_flags). This allows commands, such as | |
18 | * go, to have different permissions depending upon whether it is called | |
19 | * with an argument. | |
20 | */ | |
21 | #define KDB_ENABLE_NO_ARGS_SHIFT 10 | |
22 | ||
729043e8 | 23 | typedef enum { |
9452e977 DT |
24 | KDB_ENABLE_ALL = (1 << 0), /* Enable everything */ |
25 | KDB_ENABLE_MEM_READ = (1 << 1), | |
26 | KDB_ENABLE_MEM_WRITE = (1 << 2), | |
27 | KDB_ENABLE_REG_READ = (1 << 3), | |
28 | KDB_ENABLE_REG_WRITE = (1 << 4), | |
29 | KDB_ENABLE_INSPECT = (1 << 5), | |
30 | KDB_ENABLE_FLOW_CTRL = (1 << 6), | |
31 | KDB_ENABLE_SIGNAL = (1 << 7), | |
32 | KDB_ENABLE_REBOOT = (1 << 8), | |
33 | /* User exposed values stop here, all remaining flags are | |
34 | * exclusively used to describe a commands behaviour. | |
35 | */ | |
36 | ||
37 | KDB_ENABLE_ALWAYS_SAFE = (1 << 9), | |
38 | KDB_ENABLE_MASK = (1 << KDB_ENABLE_NO_ARGS_SHIFT) - 1, | |
39 | ||
40 | KDB_ENABLE_ALL_NO_ARGS = KDB_ENABLE_ALL << KDB_ENABLE_NO_ARGS_SHIFT, | |
41 | KDB_ENABLE_MEM_READ_NO_ARGS = KDB_ENABLE_MEM_READ | |
42 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
43 | KDB_ENABLE_MEM_WRITE_NO_ARGS = KDB_ENABLE_MEM_WRITE | |
44 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
45 | KDB_ENABLE_REG_READ_NO_ARGS = KDB_ENABLE_REG_READ | |
46 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
47 | KDB_ENABLE_REG_WRITE_NO_ARGS = KDB_ENABLE_REG_WRITE | |
48 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
49 | KDB_ENABLE_INSPECT_NO_ARGS = KDB_ENABLE_INSPECT | |
50 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
51 | KDB_ENABLE_FLOW_CTRL_NO_ARGS = KDB_ENABLE_FLOW_CTRL | |
52 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
53 | KDB_ENABLE_SIGNAL_NO_ARGS = KDB_ENABLE_SIGNAL | |
54 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
55 | KDB_ENABLE_REBOOT_NO_ARGS = KDB_ENABLE_REBOOT | |
56 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
57 | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS = KDB_ENABLE_ALWAYS_SAFE | |
58 | << KDB_ENABLE_NO_ARGS_SHIFT, | |
59 | KDB_ENABLE_MASK_NO_ARGS = KDB_ENABLE_MASK << KDB_ENABLE_NO_ARGS_SHIFT, | |
60 | ||
61 | KDB_REPEAT_NO_ARGS = 0x40000000, /* Repeat the command w/o arguments */ | |
62 | KDB_REPEAT_WITH_ARGS = 0x80000000, /* Repeat the command with args */ | |
15a42a9b | 63 | } kdb_cmdflags_t; |
729043e8 AV |
64 | |
65 | typedef int (*kdb_func_t)(int, const char **); | |
66 | ||
5d5314d6 JW |
67 | #ifdef CONFIG_KGDB_KDB |
68 | #include <linux/init.h> | |
69 | #include <linux/sched.h> | |
60063497 | 70 | #include <linux/atomic.h> |
5d5314d6 JW |
71 | |
72 | #define KDB_POLL_FUNC_MAX 5 | |
f5316b4a | 73 | extern int kdb_poll_idx; |
5d5314d6 JW |
74 | |
75 | /* | |
76 | * kdb_initial_cpu is initialized to -1, and is set to the cpu | |
77 | * number whenever the kernel debugger is entered. | |
78 | */ | |
79 | extern int kdb_initial_cpu; | |
80 | extern atomic_t kdb_event; | |
81 | ||
f7030bbc JW |
82 | /* Types and messages used for dynamically added kdb shell commands */ |
83 | ||
84 | #define KDB_MAXARGS 16 /* Maximum number of arguments to a function */ | |
85 | ||
f7030bbc JW |
86 | /* KDB return codes from a command or internal kdb function */ |
87 | #define KDB_NOTFOUND (-1) | |
88 | #define KDB_ARGCOUNT (-2) | |
89 | #define KDB_BADWIDTH (-3) | |
90 | #define KDB_BADRADIX (-4) | |
91 | #define KDB_NOTENV (-5) | |
92 | #define KDB_NOENVVALUE (-6) | |
93 | #define KDB_NOTIMP (-7) | |
94 | #define KDB_ENVFULL (-8) | |
95 | #define KDB_ENVBUFFULL (-9) | |
96 | #define KDB_TOOMANYBPT (-10) | |
97 | #define KDB_TOOMANYDBREGS (-11) | |
98 | #define KDB_DUPBPT (-12) | |
99 | #define KDB_BPTNOTFOUND (-13) | |
100 | #define KDB_BADMODE (-14) | |
101 | #define KDB_BADINT (-15) | |
102 | #define KDB_INVADDRFMT (-16) | |
103 | #define KDB_BADREG (-17) | |
104 | #define KDB_BADCPUNUM (-18) | |
105 | #define KDB_BADLENGTH (-19) | |
106 | #define KDB_NOBP (-20) | |
107 | #define KDB_BADADDR (-21) | |
420c2b1b | 108 | #define KDB_NOPERM (-22) |
f7030bbc | 109 | |
5d5314d6 JW |
110 | /* |
111 | * kdb_diemsg | |
112 | * | |
113 | * Contains a pointer to the last string supplied to the | |
114 | * kernel 'die' panic function. | |
115 | */ | |
116 | extern const char *kdb_diemsg; | |
117 | ||
118 | #define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */ | |
119 | #define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */ | |
120 | #define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */ | |
121 | #define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */ | |
5d5314d6 JW |
122 | #define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available, |
123 | * kdb is disabled */ | |
124 | #define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do | |
125 | * not use keyboard */ | |
126 | #define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do | |
127 | * not use keyboard */ | |
128 | ||
129 | extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */ | |
130 | ||
131 | extern void kdb_save_flags(void); | |
132 | extern void kdb_restore_flags(void); | |
133 | ||
134 | #define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag) | |
135 | #define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag)) | |
136 | #define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag)) | |
137 | ||
138 | /* | |
139 | * External entry point for the kernel debugger. The pt_regs | |
140 | * at the time of entry are supplied along with the reason for | |
141 | * entry to the kernel debugger. | |
142 | */ | |
143 | ||
144 | typedef enum { | |
145 | KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */ | |
146 | KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */ | |
147 | KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */ | |
148 | KDB_REASON_DEBUG, /* Debug Fault - regs valid */ | |
149 | KDB_REASON_OOPS, /* Kernel Oops - regs valid */ | |
150 | KDB_REASON_SWITCH, /* CPU switch - regs valid*/ | |
151 | KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */ | |
152 | KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */ | |
153 | KDB_REASON_RECURSE, /* Recursive entry to kdb; | |
154 | * regs probably valid */ | |
155 | KDB_REASON_SSTEP, /* Single Step trap. - regs valid */ | |
8daaa5f8 | 156 | KDB_REASON_SYSTEM_NMI, /* In NMI due to SYSTEM cmd; regs valid */ |
5d5314d6 JW |
157 | } kdb_reason_t; |
158 | ||
f7d4ca8b DT |
159 | enum kdb_msgsrc { |
160 | KDB_MSGSRC_INTERNAL, /* direct call to kdb_printf() */ | |
161 | KDB_MSGSRC_PRINTK, /* trapped from printk() */ | |
162 | }; | |
163 | ||
d37d39ae | 164 | extern int kdb_trap_printk; |
f7d4ca8b DT |
165 | extern __printf(2, 0) int vkdb_printf(enum kdb_msgsrc src, const char *fmt, |
166 | va_list args); | |
b9075fa9 JP |
167 | extern __printf(1, 2) int kdb_printf(const char *, ...); |
168 | typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...); | |
5d5314d6 JW |
169 | |
170 | extern void kdb_init(int level); | |
171 | ||
172 | /* Access to kdb specific polling devices */ | |
173 | typedef int (*get_char_func)(void); | |
174 | extern get_char_func kdb_poll_funcs[]; | |
175 | extern int kdb_get_kbd_char(void); | |
176 | ||
177 | static inline | |
178 | int kdb_process_cpu(const struct task_struct *p) | |
179 | { | |
e558af65 | 180 | unsigned int cpu = task_cpu(p); |
5d5314d6 JW |
181 | if (cpu > num_possible_cpus()) |
182 | cpu = 0; | |
183 | return cpu; | |
184 | } | |
185 | ||
186 | /* kdb access to register set for stack dumping */ | |
187 | extern struct pt_regs *kdb_current_regs; | |
91b152aa JW |
188 | #ifdef CONFIG_KALLSYMS |
189 | extern const char *kdb_walk_kallsyms(loff_t *pos); | |
190 | #else /* ! CONFIG_KALLSYMS */ | |
191 | static inline const char *kdb_walk_kallsyms(loff_t *pos) | |
192 | { | |
193 | return NULL; | |
194 | } | |
195 | #endif /* ! CONFIG_KALLSYMS */ | |
5d5314d6 | 196 | |
f7030bbc JW |
197 | /* Dynamic kdb shell command registration */ |
198 | extern int kdb_register(char *, kdb_func_t, char *, char *, short); | |
42c884c1 AV |
199 | extern int kdb_register_flags(char *, kdb_func_t, char *, char *, |
200 | short, kdb_cmdflags_t); | |
f7030bbc | 201 | extern int kdb_unregister(char *); |
5d5314d6 | 202 | #else /* ! CONFIG_KGDB_KDB */ |
729043e8 AV |
203 | static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; } |
204 | static inline void kdb_init(int level) {} | |
205 | static inline int kdb_register(char *cmd, kdb_func_t func, char *usage, | |
206 | char *help, short minlen) { return 0; } | |
42c884c1 AV |
207 | static inline int kdb_register_flags(char *cmd, kdb_func_t func, char *usage, |
208 | char *help, short minlen, | |
209 | kdb_cmdflags_t flags) { return 0; } | |
729043e8 | 210 | static inline int kdb_unregister(char *cmd) { return 0; } |
5d5314d6 JW |
211 | #endif /* CONFIG_KGDB_KDB */ |
212 | enum { | |
213 | KDB_NOT_INITIALIZED, | |
214 | KDB_INIT_EARLY, | |
215 | KDB_INIT_FULL, | |
216 | }; | |
81d44507 JW |
217 | |
218 | extern int kdbgetintenv(const char *, int *); | |
219 | extern int kdb_set(int, const char **); | |
220 | ||
5d5314d6 | 221 | #endif /* !_KDB_H */ |