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 <[email protected]>
13 * Copyright (C) 2009 Jason Wessel <[email protected]>
14 */
15
16 #include <linux/list.h>
17
18 /* Shifted versions of the command enable bits are be used if the command
19 * has no arguments (see kdb_check_flags). This allows commands, such as
20 * go, to have different permissions depending upon whether it is called
21 * with an argument.
22 */
23 #define KDB_ENABLE_NO_ARGS_SHIFT 10
24
25 typedef enum {
26 KDB_ENABLE_ALL = (1 << 0), /* Enable everything */
27 KDB_ENABLE_MEM_READ = (1 << 1),
28 KDB_ENABLE_MEM_WRITE = (1 << 2),
29 KDB_ENABLE_REG_READ = (1 << 3),
30 KDB_ENABLE_REG_WRITE = (1 << 4),
31 KDB_ENABLE_INSPECT = (1 << 5),
32 KDB_ENABLE_FLOW_CTRL = (1 << 6),
33 KDB_ENABLE_SIGNAL = (1 << 7),
34 KDB_ENABLE_REBOOT = (1 << 8),
35 /* User exposed values stop here, all remaining flags are
36 * exclusively used to describe a commands behaviour.
37 */
38
39 KDB_ENABLE_ALWAYS_SAFE = (1 << 9),
40 KDB_ENABLE_MASK = (1 << KDB_ENABLE_NO_ARGS_SHIFT) - 1,
41
42 KDB_ENABLE_ALL_NO_ARGS = KDB_ENABLE_ALL << KDB_ENABLE_NO_ARGS_SHIFT,
43 KDB_ENABLE_MEM_READ_NO_ARGS = KDB_ENABLE_MEM_READ
44 << KDB_ENABLE_NO_ARGS_SHIFT,
45 KDB_ENABLE_MEM_WRITE_NO_ARGS = KDB_ENABLE_MEM_WRITE
46 << KDB_ENABLE_NO_ARGS_SHIFT,
47 KDB_ENABLE_REG_READ_NO_ARGS = KDB_ENABLE_REG_READ
48 << KDB_ENABLE_NO_ARGS_SHIFT,
49 KDB_ENABLE_REG_WRITE_NO_ARGS = KDB_ENABLE_REG_WRITE
50 << KDB_ENABLE_NO_ARGS_SHIFT,
51 KDB_ENABLE_INSPECT_NO_ARGS = KDB_ENABLE_INSPECT
52 << KDB_ENABLE_NO_ARGS_SHIFT,
53 KDB_ENABLE_FLOW_CTRL_NO_ARGS = KDB_ENABLE_FLOW_CTRL
54 << KDB_ENABLE_NO_ARGS_SHIFT,
55 KDB_ENABLE_SIGNAL_NO_ARGS = KDB_ENABLE_SIGNAL
56 << KDB_ENABLE_NO_ARGS_SHIFT,
57 KDB_ENABLE_REBOOT_NO_ARGS = KDB_ENABLE_REBOOT
58 << KDB_ENABLE_NO_ARGS_SHIFT,
59 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS = KDB_ENABLE_ALWAYS_SAFE
60 << KDB_ENABLE_NO_ARGS_SHIFT,
61 KDB_ENABLE_MASK_NO_ARGS = KDB_ENABLE_MASK << KDB_ENABLE_NO_ARGS_SHIFT,
62
63 KDB_REPEAT_NO_ARGS = 0x40000000, /* Repeat the command w/o arguments */
64 KDB_REPEAT_WITH_ARGS = 0x80000000, /* Repeat the command with args */
65 } kdb_cmdflags_t;
66
67 typedef int (*kdb_func_t)(int, const char **);
68
69 /* The KDB shell command table */
70 typedef struct _kdbtab {
71 char *name; /* Command name */
72 kdb_func_t func; /* Function to execute command */
73 char *usage; /* Usage String for this command */
74 char *help; /* Help message for this command */
75 short minlen; /* Minimum legal # cmd chars required */
76 kdb_cmdflags_t flags; /* Command behaviour flags */
77 struct list_head list_node; /* Command list */
78 } kdbtab_t;
79
80 #ifdef CONFIG_KGDB_KDB
81 #include <linux/init.h>
82 #include <linux/sched.h>
83 #include <linux/atomic.h>
84
85 #define KDB_POLL_FUNC_MAX 5
86 extern int kdb_poll_idx;
87
88 /*
89 * kdb_initial_cpu is initialized to -1, and is set to the cpu
90 * number whenever the kernel debugger is entered.
91 */
92 extern int kdb_initial_cpu;
93
94 /* Types and messages used for dynamically added kdb shell commands */
95
96 #define KDB_MAXARGS 16 /* Maximum number of arguments to a function */
97
98 /* KDB return codes from a command or internal kdb function */
99 #define KDB_NOTFOUND (-1)
100 #define KDB_ARGCOUNT (-2)
101 #define KDB_BADWIDTH (-3)
102 #define KDB_BADRADIX (-4)
103 #define KDB_NOTENV (-5)
104 #define KDB_NOENVVALUE (-6)
105 #define KDB_NOTIMP (-7)
106 #define KDB_ENVFULL (-8)
107 #define KDB_ENVBUFFULL (-9)
108 #define KDB_TOOMANYBPT (-10)
109 #define KDB_TOOMANYDBREGS (-11)
110 #define KDB_DUPBPT (-12)
111 #define KDB_BPTNOTFOUND (-13)
112 #define KDB_BADMODE (-14)
113 #define KDB_BADINT (-15)
114 #define KDB_INVADDRFMT (-16)
115 #define KDB_BADREG (-17)
116 #define KDB_BADCPUNUM (-18)
117 #define KDB_BADLENGTH (-19)
118 #define KDB_NOBP (-20)
119 #define KDB_BADADDR (-21)
120 #define KDB_NOPERM (-22)
121
122 /*
123 * kdb_diemsg
124 *
125 * Contains a pointer to the last string supplied to the
126 * kernel 'die' panic function.
127 */
128 extern const char *kdb_diemsg;
129
130 #define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */
131 #define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */
132 #define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */
133 #define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */
134 #define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available,
135 * kdb is disabled */
136 #define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do
137 * not use keyboard */
138 #define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do
139 * not use keyboard */
140
141 extern unsigned int kdb_flags; /* Global flags, see kdb_state for per cpu state */
142
143 #define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag)
144 #define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag))
145 #define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag))
146
147 /*
148 * External entry point for the kernel debugger. The pt_regs
149 * at the time of entry are supplied along with the reason for
150 * entry to the kernel debugger.
151 */
152
153 typedef enum {
154 KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */
155 KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
156 KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */
157 KDB_REASON_DEBUG, /* Debug Fault - regs valid */
158 KDB_REASON_OOPS, /* Kernel Oops - regs valid */
159 KDB_REASON_SWITCH, /* CPU switch - regs valid*/
160 KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */
161 KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */
162 KDB_REASON_RECURSE, /* Recursive entry to kdb;
163 * regs probably valid */
164 KDB_REASON_SSTEP, /* Single Step trap. - regs valid */
165 KDB_REASON_SYSTEM_NMI, /* In NMI due to SYSTEM cmd; regs valid */
166 } kdb_reason_t;
167
168 enum kdb_msgsrc {
169 KDB_MSGSRC_INTERNAL, /* direct call to kdb_printf() */
170 KDB_MSGSRC_PRINTK, /* trapped from printk() */
171 };
172
173 extern int kdb_trap_printk;
174 extern int kdb_printf_cpu;
175 extern __printf(2, 0) int vkdb_printf(enum kdb_msgsrc src, const char *fmt,
176 va_list args);
177 extern __printf(1, 2) int kdb_printf(const char *, ...);
178 typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);
179
180 extern void kdb_init(int level);
181
182 /* Access to kdb specific polling devices */
183 typedef int (*get_char_func)(void);
184 extern get_char_func kdb_poll_funcs[];
185 extern int kdb_get_kbd_char(void);
186
187 static inline
kdb_process_cpu(const struct task_struct * p)188 int kdb_process_cpu(const struct task_struct *p)
189 {
190 unsigned int cpu = task_cpu(p);
191 if (cpu > num_possible_cpus())
192 cpu = 0;
193 return cpu;
194 }
195
196 extern void kdb_send_sig(struct task_struct *p, int sig);
197
198 #ifdef CONFIG_KALLSYMS
199 extern const char *kdb_walk_kallsyms(loff_t *pos);
200 #else /* ! CONFIG_KALLSYMS */
kdb_walk_kallsyms(loff_t * pos)201 static inline const char *kdb_walk_kallsyms(loff_t *pos)
202 {
203 return NULL;
204 }
205 #endif /* ! CONFIG_KALLSYMS */
206
207 /* Dynamic kdb shell command registration */
208 extern int kdb_register(kdbtab_t *cmd);
209 extern void kdb_unregister(kdbtab_t *cmd);
210 #else /* ! CONFIG_KGDB_KDB */
kdb_printf(const char * fmt,...)211 static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
kdb_init(int level)212 static inline void kdb_init(int level) {}
kdb_register(kdbtab_t * cmd)213 static inline int kdb_register(kdbtab_t *cmd) { return 0; }
kdb_unregister(kdbtab_t * cmd)214 static inline void kdb_unregister(kdbtab_t *cmd) {}
215 #endif /* CONFIG_KGDB_KDB */
216 enum {
217 KDB_NOT_INITIALIZED,
218 KDB_INIT_EARLY,
219 KDB_INIT_FULL,
220 };
221
222 extern int kdbgetintenv(const char *, int *);
223 extern int kdb_set(int, const char **);
224 int kdb_lsmod(int argc, const char **argv);
225
226 #endif /* !_KDB_H */
227